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WO2012133036A1 - Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision - Google Patents

Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision Download PDF

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Publication number
WO2012133036A1
WO2012133036A1 PCT/JP2012/057163 JP2012057163W WO2012133036A1 WO 2012133036 A1 WO2012133036 A1 WO 2012133036A1 JP 2012057163 W JP2012057163 W JP 2012057163W WO 2012133036 A1 WO2012133036 A1 WO 2012133036A1
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WO
WIPO (PCT)
Prior art keywords
light
light transmission
plate
led
transmission region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/057163
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English (en)
Japanese (ja)
Inventor
泰守 黒水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of WO2012133036A1 publication Critical patent/WO2012133036A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/46—Fixing elements
    • G02F2201/465—Snap -fit
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/52—RGB geometrical arrangements

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • a backlight device is required as a separate lighting device.
  • This backlight device is installed on the back surface opposite to the display surface of the liquid crystal panel.
  • the backlight device has a chassis with the surface on the liquid crystal panel side as an opening, a light source accommodated in the chassis, and an inner surface of the chassis. And a reflection sheet that reflects light from the light source toward the opening side of the chassis, and an optical member (such as a diffusion sheet) that covers the opening of the chassis and converts the light from the light source into a planar shape.
  • an LED is preferably used as a light source.
  • a direct type in which a number of LEDs are arranged in a plane on a bottom plate of a chassis is known.
  • the peripheral portion is visually recognized as a dark portion due to insufficient light quantity.
  • the thing of patent document 1 is known as what solved this problem.
  • the direct type backlight device described in Patent Document 1 is such that the arrangement interval of LEDs arranged in a plane on the bottom plate of the chassis is higher in density at the periphery than at the center. According to such a configuration, since the LEDs emit light at high density in the peripheral portion of the chassis that is easily visible as a dark portion, it is possible to compensate for a shortage of light in the peripheral portion.
  • a power cable for supplying power to the LEDs is routed on the inner peripheral edge of the chassis, and the reflection sheet rises while being inclined toward the opening edge of the chassis so as to cover it.
  • the inclination angle at the peripheral portion of the reflection sheet becomes gentle, and the light emitted from the LED is particularly this.
  • Luminance unevenness may occur on the display surface of the liquid crystal panel by being emitted toward the liquid crystal panel without being sufficiently multiple-reflected at the peripheral edge of the inclined reflection sheet.
  • the present invention has been completed based on the above situation, and an object thereof is to reduce luminance unevenness.
  • An illumination device includes a light source, a chassis that houses the light source, includes a bottom plate, a side plate that rises from a peripheral portion of the bottom plate, a light output portion that can emit light from the light source, and the light output portion.
  • a light-transmitting member disposed so as to cover and having a high light-transmitting region formed on the side plate side and having a relatively higher light transmittance than the other light-transmitting regions. However, it has characteristics.
  • a high light transmission region is provided on the side plate side of the chassis that is easily visible as a dark portion, that is, the peripheral portion of the optical member, so that the light transmittance in the vicinity of the side plate is higher than that of other light transmission regions. Get higher.
  • the optical member includes a diffusing plate that diffuses incident light, and the diffusing plate is formed more in the light transmissive region than the high light transmissive region on the light source side plate surface.
  • a low light transmission portion having a light reflectance higher than that of the plate.
  • the luminance of the light emitted from the diffusion plate can be easily seen as a dark portion on the side plate side of the chassis. In other words, it can be adjusted to the brightness of the peripheral portion. That is, rather than increasing the light transmittance of the high light transmissive region, by forming a low light transmissive portion, the light transmittance of the other light transmissive region is lower than the light transmittance of the high light transmissive region.
  • the luminance distribution of emitted light is made uniform. As described above, it is possible to improve the luminance unevenness by reducing the light transmittance of the other light transmissive regions without increasing the light transmittance of the high light transmissive region itself.
  • a large number of the low light transmission portions are formed at regular intervals, and the surface area gradually decreases toward the high light transmission region.
  • the proportion of the low light transmission part in the high light transmission region can be reduced.
  • the light transmittance of the diffusion plate can be gradually increased over the high light transmission region, and more natural in the light emitted from the diffusion plate. A luminance distribution without unevenness can be obtained.
  • the low light transmission portion is not formed in the high light transmission region, but is formed in another light transmission region.
  • the low light transmission part is formed by printing a paste having light reflectivity in a dot shape. If the low light transmission part is configured with a dot pattern, the degree of transmission (reflection) can be controlled by the pattern mode (number, area, etc.), so the brightness distribution of the light emitted from the diffuser can be easily adjusted. It becomes possible to do.
  • the optical member is a plate-like member that diffuses incident light, and includes a diffusion plate that is relatively thin in the high light transmission region. If the thickness of the diffusing plate is reduced, the probability of being diffused by the diffusing particles or the like is lowered, and the light transmittance is improved. As a result, the light transmittance in the high light transmission region can be increased as compared with other light transmission regions, so that even if the amount of light incident on the high light transmission region is small, the luminance of the light emitted from the high light transmission region and other light It is possible to adjust the balance with the luminance of the light emitted from the transmission region. Therefore, it is possible to reduce uneven brightness of light emitted from the diffusion plate.
  • the optical member includes a diffusion plate in which diffusion particles are dispersed in a resin base material, and includes a diffusion plate having a relatively low distribution density of the diffusion particles in the high light transmission region.
  • the light source is disposed on the bottom plate, and an emission direction thereof is a direction of the light output part.
  • the present invention is particularly useful when the present invention is applied to a so-called direct type in which a light source is arranged opposite to a light output portion capable of emitting light from the light source.
  • the bottom plate includes a reflective member that faces the optical member and is disposed along the bottom plate and reflects light from the light source, and the reflective member is a rectangular bottom portion disposed along the bottom plate. And a rising portion that rises from the adjacent two sides of the bottom portion to the light emitting side of the side plate of the chassis and has a seam formed between adjacent side edges, and the high light transmission region is flat with the rising portion. Visual superimposition.
  • the amount of light incident on the optical member differs between the region of the optical member disposed opposite to the bottom of the reflecting member and the region of the optical member disposed opposite to the rising portion. That is, the bottom part of the reflecting member is arranged along the bottom plate of the chassis, the bottom plate and the light emitting part are opposed to each other, and the optical member is arranged so as to cover the light emitting part. Therefore, the bottom part of the reflecting member is disposed so as to face the optical member, and most of the light reflected by the bottom part enters the facing optical member.
  • the rising part of the reflecting member rises from the bottom part to the light emitting side of the side plate of the chassis, for example, when the optical member is formed of a flat plate, the rising part is always predetermined with respect to the optical member. Are overlapped with each other. Therefore, the light reflected at the rising portion is less likely to be incident on the optical member directly above, and the amount of incident light is greater in the optical member region opposed to the rising portion than in the optical member region opposed to the bottom portion. I can explain the inevitably less. Therefore, it is useful to provide a high light transmission region in the region of the optical member that overlaps the rising portion in plan view.
  • the rising portion rises from the bottom portion with an inclination.
  • the light transmission region of the optical member that overlaps the rising portion in plan view is wider than when the rising portion rises perpendicularly to the bottom.
  • the light incidence rate on the optical member that is overlapped on the rising portion may not be sufficiently reflected, and thus decreases. Therefore, when such a rising part is inclined from the bottom part and the range of the peripheral part visually recognized as a dark part is widened, at least a high transmission area is provided in the light transmission area of the optical member overlapping the rising part. This is effective in reducing dark areas and reducing luminance unevenness.
  • the light is emitted from the optical member by providing a high transmission region in the light transmission region of the optical member superimposed on the rising portion and increasing the light transmittance. It is possible to reduce the luminance unevenness of light.
  • the high light transmission region is formed in a portion of the optical member corresponding to a corner of the bottom plate of the chassis.
  • the corner portion of the bottom plate of the chassis is an area that is easily visible as a dark portion due to a configuration in which the side plates of the chassis are close to each other and the reflecting member is arranged with an angle with respect to the optical member. Therefore, if a high light transmission region is directly provided at this corner, at least a reduction in luminance due to insufficient incident light quantity can be improved by the high light transmission region.
  • a high light transmission region at a position corresponding to a region that is easily visible as a dark part, it is possible to efficiently reduce luminance unevenness.
  • the light source is an LED. If the present invention is applied to an LED having a light source, it is possible to extend the life of the light source and reduce power consumption.
  • a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device. According to such a display device, luminance unevenness is reduced in the illumination device that supplies light to the display panel. Similarly, the display device can also reduce luminance unevenness and have excellent display quality. it can.
  • a liquid crystal panel can be exemplified as the display panel.
  • Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
  • Exploded perspective view showing schematic configuration of liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal panel Enlarged plan view showing the planar configuration of the array substrate Enlarged plan view showing the planar configuration of the CF substrate
  • the top view which shows arrangement
  • Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device 6 is an enlarged plan view of the main part of FIG.
  • FIG. 10 is a graph showing changes in light transmittance along the line AC in FIG.
  • the principal part enlarged plan view which shows schematic structure of the surface facing LED in the high light transmission area
  • FIG. The graph which shows the change of the light transmittance along the AC line of FIG. The graph which shows the change of the light transmittance along the AC line of the diffusion plate which concerns on the modification 2 of Embodiment 1.
  • FIG. 6 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to Embodiment 4.
  • Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device
  • the top view which shows the arrangement structure seen from the front side of the backlight apparatus Plan view showing light transmittance distribution of diffuser
  • FIG. 25 is a graph showing changes in light transmittance along the line A-D in FIG.
  • An enlarged plan view showing a planar configuration of a CF substrate according to (6) of another embodiment An enlarged plan view showing a planar configuration of a CF substrate according to (7) of another embodiment
  • An enlarged plan view showing a planar configuration of a CF substrate according to (11) of another embodiment An enlarged plan view showing a planar configuration of an array substrate according to (11) of another embodiment
  • FIGS. 1 A first embodiment of the present invention will be described with reference to FIGS.
  • the liquid crystal display device 10 is illustrated.
  • a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing.
  • the upper side shown in FIG. 2 be a front side, and let the lower side of the figure be a back side.
  • the television receiver TV includes a liquid crystal display device 10 that is a display device, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and power supply.
  • Power supply circuit board P a tuner (receiving unit) T capable of receiving a TV image signal, an image conversion circuit board VC for converting the TV image signal output from the tuner T into an image signal for the liquid crystal display device 10
  • a stand S a stand S.
  • the liquid crystal display device 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole, the long side direction is the horizontal direction (X-axis direction), and the short side direction is the vertical direction (Y-axis direction, vertical direction).
  • the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
  • the configuration of the liquid crystal panel 11 in the liquid crystal display device 10 will be described.
  • the liquid crystal panel 11 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole.
  • a pair of transparent (translucent) glass substrates 11a and 11b and a liquid crystal layer 11c containing liquid crystal, which is a substance whose optical characteristics change with application of an electric field.
  • the substrates 11a and 11b maintain a gap corresponding to the thickness of the liquid crystal layer. In the state, they are bonded together by a sealing agent (not shown).
  • polarizing plates 11d and 11e are attached to the outer surface sides of both the substrates 11a and 11b, respectively. Note that the long side direction of the liquid crystal panel 11 coincides with the X-axis direction, and the short side direction coincides with the Y-axis direction.
  • the front side is the CF substrate 11a
  • the back side is the array substrate 11b.
  • TFTs Thin Film Transistors
  • pixel electrodes 15 which are switching elements are matrixed.
  • a large number of gate wirings 16 and source wirings 17 are arranged around the TFTs 14 and the pixel electrodes 15 so as to surround the TFTs 14 and the pixel electrodes 15.
  • the pixel electrode 15 has a vertically long (longitudinal) rectangular shape (rectangular shape) in which the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction. It consists of a transparent electrode such as (Zinc Oxide).
  • the gate wiring 16 and the source wiring 17 are connected to the gate electrode and the source electrode of the TFT 14, respectively, and the pixel electrode 15 is connected to the drain electrode of the TFT 14. Further, as shown in FIG. 3, an alignment film 18 for aligning liquid crystal molecules is provided on the TFT 14 and the pixel electrode 15 on the liquid crystal layer 11c side.
  • a terminal portion led out from the gate wiring 16 and the source wiring 17 is formed at an end portion of the array substrate 11b, and a driver component for driving a liquid crystal (not shown) is connected to the anisotropic conductive film (not shown).
  • ACF isotropic Conductive Film
  • the driver component for driving the liquid crystal is electrically connected to a display control circuit board (not shown) via various wiring boards.
  • This display control circuit board is connected to an image conversion circuit board VC (see FIG. 1) in the television receiver TV, and each wiring 16, 17 via a driver component based on an output signal from the image conversion circuit board VC. It is assumed that a drive signal is supplied to.
  • a color filter 19 in which the portions R, G, B, and Y are arranged in a matrix (matrix) is provided.
  • the color filter 19 according to the present embodiment includes a yellow colored portion Y in addition to a red colored portion R, a green colored portion G, and a blue colored portion B that are the three primary colors of light.
  • the colored portions R, G, B, and Y selectively transmit light of each corresponding color (each wavelength).
  • Each colored portion R, G, B, Y has a vertically long (longitudinal) rectangular shape (rectangular shape) in which the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction, like the pixel electrode 15. I am doing.
  • a lattice-shaped light shielding layer (black matrix) BM is provided to prevent color mixing.
  • a counter electrode 20 and an alignment film 21 are sequentially stacked on the color filter 19 on the CF substrate 11 a on the liquid crystal layer 11 c side.
  • the colored portions R, G, B, and Y constituting the color filter 19 will be described in detail.
  • the colored portions R, G, B, and Y are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction.
  • Y have the same dimension in the column direction (Y-axis direction), but the dimension in the row direction (X-axis direction) is different for each colored portion R, G, B, Y.
  • the colored portions R, G, B, and Y are arranged in the row direction in the order of the red colored portion R, the green colored portion G, the blue colored portion B, and the yellow colored portion Y from the left side shown in FIG.
  • the red colored portion R and the blue colored portion B in the row direction are relatively larger than the yellow colored portion Y and the green colored portion G in the row direction. It is said. That is, the colored portions R and B having relatively large dimensions in the row direction and the colored portions G and Y having relatively small dimensions in the row direction are alternately and repeatedly arranged in the row direction. Thereby, the area of the red coloring part R and the blue coloring part B is made larger than the areas of the green coloring part G and the yellow coloring part Y. The areas of the blue colored portion B and the red colored portion R are equal to each other. Similarly, the areas of the green colored portion G and the yellow colored portion Y are equal to each other. 3 and 5 show a case where the areas of the red colored portion R and the blue colored portion B are about 1.6 times the areas of the yellow colored portion Y and the green colored portion G. Show.
  • the dimension in the row direction (X-axis direction) of the pixel electrode 15 varies from column to column. . That is, among the pixel electrodes 15, the size and area in the row direction of the pixel electrode 15 that overlaps with the red color portion R and the blue color portion B are the same as those in the row direction of the pixel electrode 15 that overlaps with the yellow color portion Y and the green color portion G. It is relatively larger than the size and area.
  • the gate wirings 16 are all arranged at an equal pitch, while the source wirings 17 are arranged at two different pitches depending on the dimensions of the pixel electrodes 15 in the row direction.
  • the liquid crystal display device 10 uses the liquid crystal panel 11 including the color filter 19 including the four colored portions R, G, B, and Y, as shown in FIG.
  • the television receiver TV is provided with a dedicated image conversion circuit board VC. That is, the image conversion circuit board VC converts the television image signal output from the tuner T into an image signal of each color of blue, green, red, and yellow, and outputs the generated image signal of each color to the display control circuit board. can do. Based on this image signal, the display control circuit board drives the TFTs 14 corresponding to the pixels of each color in the liquid crystal panel 11 via the wirings 16 and 17, and transmits the colored portions R, G, B, and Y of each color. The amount of light can be appropriately controlled.
  • the backlight device 12 includes a chassis 22 having a substantially box shape having an opening (corresponding to a light output portion) on the light emitting surface side (liquid crystal panel 11 side), and an opening of the chassis 22. And a frame 26 that is disposed along the outer edge of the chassis 22 and holds the outer edge of the group of optical members 23 between the chassis 22 and the chassis 22. Further, in the chassis 22, the LED 24 arranged opposite to the position directly below the optical member 23 (the liquid crystal panel 11), the LED board 25 on which the LED 24 is mounted, and a position corresponding to the LED 24 on the LED board 25. And a diffusing lens 27 attached to the lens.
  • the backlight device 12 is a so-called direct type.
  • a holding member 28 that can hold the LED substrate 25 between the chassis 22 and a reflection sheet 29 that reflects the light in the chassis 22 toward the optical member 23 are provided. .
  • each component of the backlight device 12 will be described in detail.
  • the chassis 22 is made of metal, and as shown in FIGS. 6 to 8, a bottom plate 22a having a horizontally long rectangular shape (rectangular shape, rectangular shape) like the liquid crystal panel 11, and each side (a pair of bottom plates 22a) It consists of a side plate 22b that rises from the outer end of the long side and a pair of short sides toward the front side (light emission side) and a receiving plate 22c that projects outward from the rising end of each side plate 22b. It has a shallow box shape (substantially a shallow dish) that opens toward the top.
  • the long side direction of the chassis 22 coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction).
  • a frame 26 and an optical member 23 to be described below can be placed on each receiving plate 22c in the chassis 22 from the front side.
  • a frame 26 is screwed to each receiving plate 22c.
  • An attachment hole for attaching the holding member 28 is provided in the bottom plate 22 a of the chassis 22.
  • a plurality of mounting holes are arranged in a distributed manner corresponding to the mounting position of the holding member 28 on the bottom plate 22a.
  • the optical member 23 has a horizontally long rectangular shape in a plan view, like the liquid crystal panel 11 and the chassis 22. As shown in FIGS. 7 and 8, the optical member 23 has an outer edge portion placed on the receiving plate 22c so as to cover the opening of the chassis 22 and between the liquid crystal panel 11 and the LED 24 (LED substrate 25). It is arranged in the middle.
  • the optical member 23 includes a diffusion plate 23a disposed on the back side (the LED 24 side, opposite to the light emitting side) and an optical sheet 23b disposed on the front side (the liquid crystal panel 11 side, the light emitting side). .
  • the diffusing plate 23a has a structure in which a large number of diffusing particles are dispersed in a substrate made of a substantially transparent resin having a predetermined thickness and has a function of diffusing transmitted light.
  • the optical sheet 23b has a sheet shape that is thinner than the diffusion plate 23a, and two optical sheets 23b are laminated. Specific types of the optical sheet 23b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.
  • the frame 26 has a frame shape along the outer peripheral edge portions of the liquid crystal panel 11 and the optical member 23. An outer edge portion of the optical member 23 can be sandwiched between the frame 26 and each receiving plate 22c (FIGS. 7 and 8).
  • the frame 26 can receive the outer edge portion of the liquid crystal panel 11 from the back side, and can sandwich the outer edge portion of the liquid crystal panel 11 with the bezel 13 arranged on the front side (FIGS. 7 and 8). ).
  • the LED 24 is a so-called top type in which the LED 24 is mounted on the LED substrate 25 and the surface opposite to the mounting surface with respect to the LED 24 is a light emitting surface.
  • the LED 24 includes an LED chip that emits blue light as a light emission source, and includes a green phosphor and a red phosphor as phosphors that emit light when excited by blue light.
  • the LED 24 has a configuration in which an LED chip made of, for example, an InGaN-based material is sealed with a resin material on a substrate portion fixed to the LED substrate 25.
  • the LED chip mounted on the substrate part has a main emission wavelength in the range of 420 nm to 500 nm, that is, in the blue wavelength region, and can emit blue light (blue monochromatic light) with excellent color purity. Is done.
  • a specific main emission wavelength of the LED chip for example, 451 nm is preferable.
  • the resin material that seals the LED chip is excited by the blue phosphor emitted from the LED chip and the green phosphor that emits green light by being excited by the blue light emitted from the LED chip. And a red phosphor emitting red light is dispersed and blended at a predetermined ratio.
  • the LED 24 is made up of blue light (blue component light) emitted from these LED chips, green light (green component light) emitted from the green phosphor, and red light (red component light) emitted from the red phosphor. Is capable of emitting light of a predetermined color as a whole, for example, white or blueish white. Since yellow light is obtained by synthesizing the green component light from the green phosphor and the red component light from the red phosphor, the LED 24 includes the blue component light and the yellow component from the LED chip. It can be said that it also has the light of.
  • the chromaticity of the LED 24 varies depending on, for example, the absolute value or relative value of the content of the green phosphor and the red phosphor, and accordingly the content of the green phosphor and the red phosphor is adjusted as appropriate. Thus, the chromaticity of the LED 24 can be adjusted.
  • the green phosphor has a main emission peak in the green wavelength region of 500 nm to 570 nm
  • the red phosphor has a main emission peak in the red wavelength region of 600 nm to 780 nm. It is said.
  • the green phosphor and the red phosphor provided in the LED 24 will be described in detail.
  • ⁇ -SiAlON which is a kind of sialon phosphor
  • the sialon-based phosphor is a substance in which a part of silicon atoms of silicon nitride is replaced with aluminum atoms and a part of nitrogen atoms with oxygen atoms, that is, a nitride.
  • a sialon-based phosphor that is a nitride is superior in luminous efficiency and durability as compared with other phosphors made of, for example, sulfides or oxides.
  • “excellent in durability” specifically means that, even when exposed to high-energy excitation light from an LED chip, the luminance does not easily decrease over time.
  • rare earth elements eg, Tb, Yg, Ag, etc.
  • ⁇ -SiAlON which is a kind of sialon-based phosphor, has a general formula Si6-zAlzOzN8-z: Eu (z indicates a solid solution amount) or (Si, Al) in which aluminum and oxygen are dissolved in ⁇ -type silicon nitride crystal. ) 6 (O, N) 8: A substance represented by Eu.
  • the ⁇ -SiAlON for example, Eu (europium) is used as an activator, and thereby the color purity of green light, which is emitted light, is particularly high. It is extremely useful in adjusting On the other hand, as the red phosphor, it is preferable to use casoon, which is a kind of cascading phosphor.
  • Cousin-based phosphors are nitrides containing calcium atoms (Ca), aluminum atoms (Al), silicon atoms (Si), and nitrogen atoms (N). For example, other phosphors made of sulfides, oxides, etc. In comparison, it is excellent in luminous efficiency and durability.
  • the cascading phosphor uses rare earth elements (for example, Tb, Yg, Ag, etc.) as an activator.
  • Casun which is a kind of cousin phosphor, uses Eu (europium) as an activator and is represented by the composition formula CaAlSiN3: Eu.
  • the LED substrate 25 has a base material that is horizontally long when viewed in a plane.
  • the long side direction coincides with the X axis direction
  • the short side direction coincides with the Y axis direction.
  • the chassis 22 is accommodated while extending along the bottom plate 22a.
  • the LED 24 is surface-mounted on the plate surface facing the front side (the surface facing the optical member 23 side).
  • the mounted LED 24 has a light emitting surface facing the optical member 23 (the liquid crystal panel 11) and an optical axis that coincides with the Z-axis direction, that is, the direction orthogonal to the display surface of the liquid crystal panel 11.
  • a plurality of (for example, 15 in FIG. 6) LEDs 24 are linearly arranged along the long side direction (X-axis direction) on the LED substrate 25 and are connected to the LEDs 24 arranged in parallel. A pattern (not shown) is formed.
  • the arrangement pitch of the LEDs 24 is substantially constant, that is, it can be said that the LEDs 24 are arranged at substantially equal intervals in the X-axis direction.
  • the LED substrate 25 having the above-described configuration is arranged in parallel in the chassis 22 in a state where the long side direction and the short side direction are aligned with each other in the X-axis direction and the Y-axis direction. ing. That is, the LED substrate 25 and the LED 24 mounted thereon are both set in the X-axis direction (the long side direction of the chassis 22 and the LED substrate 25) in the chassis 22 and in the Y-axis direction (the chassis 22 and the LED substrate 25).
  • the short side direction is arranged in a matrix with the column direction (arranged in a matrix, planar arrangement).
  • a total of 28 LED substrates 25 are arranged in parallel in a matrix in the chassis 22, two in the X-axis direction and 14 in the Y-axis direction.
  • the LED boards 25 arranged in parallel in the Y-axis direction have a so-called unequal pitch arrangement in which the arrangement pitch changes according to the position.
  • the arrangement pitch is narrower toward the side, and the arrangement pitch is wider toward both ends in the Y-axis direction.
  • sequence about the Y-axis direction in each LED24 mounted on each LED board 25 is also made into an unequal pitch arrangement
  • the end portion on the outer edge side in the long side direction of the chassis 22 (the end portion on the opposite side to the LED substrate 25 side adjacent in the X-axis direction) is a connector portion.
  • 25a is provided, and this connector portion 25a is electrically connected to the external LED drive circuit side connector 30a, so that the drive of each LED 24 on the LED substrate 25 can be controlled.
  • a through hole 25 b for passing the holding member 28 is formed at a position corresponding to the mounting position of the holding member 28 in the LED substrate 25.
  • the base material of the LED substrate 25 is made of a metal such as an aluminum material same as that of the chassis 22, and a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer.
  • a wiring pattern made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer.
  • the outermost surface is formed with a reflective layer (not shown) that exhibits white light with excellent light reflectivity.
  • insulating materials such as a ceramic.
  • the diffusing lens 27 is made of a synthetic resin material (for example, polycarbonate, acrylic, etc.) that is substantially transparent (having high translucency) and has a refractive index higher than that of air. As shown in FIGS. 6 and 8, the diffusion lens 27 has a predetermined thickness and is formed in a substantially circular shape when seen in a plan view so as to individually cover each LED 24 from the front side with respect to the LED substrate 25. That is, each LED 24 is attached so as to overlap with each other when seen in a plan view.
  • the diffusing lens 27 can emit light having strong directivity emitted from the LED 24 while diffusing.
  • the diffusing lens 27 is disposed at a position that is substantially concentric with the LED 24 in a plan view. In FIG. 7, since the cross-sectional configuration of the holding member 28 is illustrated, the side surface of the diffusing lens 27 disposed on the back side of the drawing is illustrated.
  • the holding member 28 is made of a synthetic resin such as polycarbonate, and has a white surface with excellent light reflectivity. As shown in FIGS. 6 to 8, the holding member 28 is fixed to the chassis 22 by protruding from the main body 28 a toward the back side, that is, the chassis 22 side, along the main body 28 a along the plate surface of the LED substrate 25. Part 28b.
  • the main body 28 a has a substantially circular plate shape when seen in a plan view, and can hold at least the LED substrate 25 with the bottom plate 22 a of the chassis 22.
  • the fixing portion 28b can be locked to the bottom plate 22a while penetrating the insertion holes 25b and the attachment holes respectively formed corresponding to the mounting positions of the holding member 28 on the LED board 25 and the bottom plate 22a of the chassis 22. .
  • a plurality of holding members 28 are appropriately distributed in the plane of the LED substrate 25, and are arranged at positions adjacent to the diffusion lens 27 (LED 24) in the X-axis direction. Yes.
  • the holding member 28 sandwiches the LED board 25 between the main body 25a and the bottom plate 22a of the chassis 22 without the bottom 29a of the reflection sheet 29 (first).
  • 1 holding member and a member (second holding member) that sandwiches the bottom portion 29a of the reflection sheet 29 together with the LED substrate 25 between the main body portion 25a and the bottom plate 22a of the chassis 22 are included.
  • the holding member 28 (second holding member) that holds the bottom 29a of the reflection sheet 29 together with the LED substrate 25 is provided with a support portion 28c that protrudes from the main body portion 28a to the front side, and the support portion 28c. Two types are included.
  • the support portion 28c can support the optical member 23 (directly the diffusion plate 23a) from the back side, thereby maintaining a constant positional relationship between the LED 24 and the optical member 23 in the Z-axis direction. And inadvertent deformation of the optical member 23 can be restricted.
  • the reflection sheet 29 is made of a synthetic resin, and the surface thereof is white with excellent light reflectivity. As shown in FIGS. 6 to 8, the reflection sheet 29 has a size that is laid over almost the entire inner surface of the chassis 22, so that all the LED boards 25 arranged in parallel in the chassis 22 are arranged. Covering from the front side is possible. The reflection sheet 29 can efficiently raise the light in the chassis 22 toward the optical member 23 side.
  • the reflection sheet 29 extends along the bottom plate 22a of the chassis 22 and covers a large portion of the bottom plate 22a.
  • the reflection sheet 29 rises from each outer end of the bottom portion 29a to the front side and is inclined with respect to the bottom portion 29a.
  • the four rising portions 29b are formed, and the extending portions 29c that extend outward from the outer ends of the respective rising portions 29b and are placed on the receiving plate 22c of the chassis 22 are configured.
  • the bottom portion 29 a of the reflection sheet 29 is arranged so as to overlap the front side surface of each LED substrate 25, that is, the mounting surface of the LED 24. Further, the bottom 29a of the reflection sheet 29 is provided with a lens insertion hole through which each diffusion lens 27 is inserted at a position overlapping with each diffusion lens 27 (each LED 24) in plan view.
  • the bottom portion 29a is provided with a holding member insertion hole for passing the fixing portion 28b at a position overlapping with each holding member 28 in plan view, and particularly holds the LED substrate 25 without passing through the bottom portion 29a.
  • the holding member insertion hole corresponding to the holding member 28 (first holding member) is set to a size that allows the main body portion 28a to pass therethrough.
  • the color filter 19 of the liquid crystal panel 11 includes a yellow colored portion in addition to the colored portions R, G, and B, which are the three primary colors of light, as shown in FIGS. Since Y is included, the color gamut of the display image displayed by the transmitted light is expanded, so that it is possible to realize display with excellent color reproducibility. In addition, since the light transmitted through the yellow colored portion Y has a wavelength close to the peak of visibility, the human eye tends to perceive brightly even with a small amount of energy. Thereby, even if it suppresses the output of LED24 which the backlight apparatus 12 has, sufficient brightness
  • the display image of the liquid crystal panel 11 tends to be yellowish as a whole.
  • the chromaticity in the LED 24 is adjusted to a blue color that is a complementary color of yellow, thereby correcting the chromaticity in the display image.
  • the LED 24 of the backlight device 12 has the main emission wavelength in the blue wavelength region and the highest light emission intensity in the blue wavelength region. ing.
  • the area ratio of the blue colored portion B constituting the color filter 19 is set to be relatively larger than that of the green colored portion G and the yellow colored portion Y, whereby the color filter
  • the 19 transmitted light can contain more blue light which is a complementary color of yellow.
  • the brightness of the red light among the light emitted from the liquid crystal panel 11 is lowered. This is because, in the four primary color type liquid crystal panel 11, compared to the three primary color type, the number of subpixels constituting one pixel increases from three to four, so the area of each subpixel decreases. It is presumed that the brightness of the red light is particularly lowered due to this.
  • the area ratio of the red colored portion R constituting the color filter 19 is set to be relatively larger than that of the green colored portion G and the yellow colored portion Y, whereby the color filter
  • the transmitted light of 19 can contain a larger amount of red light, so that it is possible to suppress a decrease in lightness of the red light caused by the color filter 19 having four colors.
  • a pair of rising portions 29b that rise from the outer end of the bottom portion 29a along the X-axis direction (long side direction of the chassis 22) and face each other are shown in FIG. Thus, it is set as the 1st rising part 29b1.
  • the pair of rising portions 29b that rise from the outer end of the bottom portion 29a along the Y-axis direction (the short side direction of the chassis 22) and face each other serve as a second rising portion 29b2.
  • the adjacent first rising portion 29b1 and second rising portion 29b2 are in a state of covering the front side of the chassis 22 with no gap by abutting the end edges.
  • first rising portion 29b1 and the second rising portion 29b2 are directed from the corner portion 29a1 of the bottom portion 29a of the reflection sheet 29 toward the corner portion 22b1 of the chassis 22 (four corners where adjacent side plates 22b intersect).
  • a seam J which is a boundary line, is formed.
  • the rising portion 29b has a function of covering the power supply wiring 30 (see FIGS. 7 and 8) routed along the side plate 22b side on the bottom plate 22a of the chassis 22. More specifically, first, the power supply wiring 30 electrically connects the above-described external LED drive circuit and the wiring pattern of each LED board 25 and supplies power to the LEDs 24 mounted on each LED board 25. is there. An external LED drive circuit side connector 30 a is provided at one end of the power supply wiring 30, and this connector 30 a is connected to the connector portion 25 a of each LED board 25.
  • the plurality of power supply wires 30 connected to each connector portion 25a are gathered on the edge of the side plate 22b on the bottom plate 22a of the chassis 22, and from the wiring lead-out port (not shown) to the outside (rear surface) of the chassis 22. And then routed to the LED drive circuit side. If such a plurality of power supply wirings 30 are arranged on the reflection sheet 29, the reflection efficiency is lowered, and there is a possibility that luminance unevenness occurs in the emitted light. For this reason, the power supply wiring 30 is routed between the rising portion 29 b where the reflection sheet 29 is raised and the chassis 22 so as to cover the power supply wiring 30 from the light emitting surface side.
  • the amount of emitted light corresponding to the four corners of the bottom plate 22a of the chassis 22 depends on the rising angle of the rising portion 29b and the distance from the bottom portion 29b to the rising portion 29b.
  • the configuration of the diffusing plate 23a in the optical member 23 described above is as follows and will be described in detail.
  • the diffusion plate 23a is formed by dispersing and blending a large number of diffusion particles for diffusing light in a resin base material, and the light transmittance and light reflectance are substantially uniform throughout.
  • the light transmittance ⁇ of the diffusion plate 23a is preferably about 87.5% and the light reflectance is about 12.5%.
  • the diffusion plate 23a has a surface facing the LED 24 out of the plate surface as a back surface 23a1, a surface opposite to the LED facing surface 23a1, and a surface facing the liquid crystal panel 11 as a surface 23a2. Yes.
  • the back surface 23a1 functions as a light incident surface on which light from the LED 24 is incident
  • the front surface 23a2 functions as a light emitting surface that emits light (illumination light) toward the liquid crystal panel 11.
  • the diffuser plate 23a guides light incident from the back surface 23a1, and is emitted from the front surface 23a2 when the incident angle with respect to the front surface 23a2 is equal to or smaller than the critical angle. Until the light is emitted from the surface 23a2, a lot of light guided into the diffusion plate 23a repeats total reflection on the surface 23a2 and diffusion caused by hitting the diffusing particles.
  • the four corner regions are superposed on the rising portion 29b of the reflection sheet 29 in plan view, and are set as a high light transmission region 40.
  • the other light transmission region is a low light transmission region 41.
  • the light transmittance of the diffuser plate 23a is set higher in the high light transmission region 40 than in the low light transmission region 41, as shown in FIG.
  • the light transmittance in each of the regions 40 and 41 is adjusted by a low light transmitting portion 42 formed on the back surface 23a1 of the diffusion plate 23a.
  • the low light transmission part 42 is comprised by the dot pattern which exhibits the white formed in layered form on the back surface 23a1.
  • Each low light transmission portion 42 (that is, one dot constituting the dot pattern) has a circular shape in plan view and is arranged at predetermined intervals.
  • the low light transmission part 42 is formed, for example, by printing a paste containing a metal oxide on the back surface 23a1 of the diffusion plate 23a. As the printing means, screen printing, ink jet printing and the like are suitable.
  • the low light transmission portion 42 has a high light reflectivity while its own light reflectivity is about 75%, for example, and the in-plane light reflectivity is about 12.5%. (Low light transmittance).
  • the light reflectance of the diffuser plate 23a itself and the low light transmission portion 42 exemplified in the present embodiment is an average within the measurement diameter measured by LAV (measurement diameter ⁇ 25.4 mm) of CM-3700d manufactured by Konica Minolta. Light reflectance is used.
  • the light reflectance of the low light transmission part 42 itself is a value obtained by forming the low light transmission part 42 on one surface of the glass substrate and measuring the formation surface based on the measurement means.
  • the surface area per dot is different between the low light transmission portion 42 a formed in the high light transmission region 40 and the low light transmission portion 42 b formed in the low light transmission region 41. More specifically, as shown in FIG. 11, when the low light transmission part 42a formed in the high light transmission region 40 and the low light transmission part 42b formed in the low light transmission region 41 are compared, the arrangement interval is the same. That is, the distance between the center points of the dots of each light transmitting portion 42 is not changed, and only the dot diameter, that is, the surface area is different.
  • the low light transmission part 42 a formed in the high light transmission region 40 has a smaller surface area than the low light transmission part 42 b formed in the low light transmission region 41, and thus the low light occupying the back surface 23 a 1 in the high light transmission region 40.
  • the ratio of the light transmission part 42 a is smaller than the ratio of the low light transmission part 42 b occupying the back surface 23 a 1 in the low light transmission region 41. Therefore, when the amount of light incident from the back surface 23 a 1 of the diffusion plate 23 a is the same, the incidence rate in the high light transmission region 40 is high, and the incidence rate in the low light transmission region 41 is low compared to that in the high light transmission region 40.
  • the light transmittance in the high light transmission region 40 (between B and C) is relatively higher than the light transmittance in the low light transmission region 41 (between A and B).
  • each light transmittance is adjusted by forming the low light transmission part 42 in the back surface 23a1 of the diffusion plate 23a, it is more than light transmittance alpha (for example, about 87.5%) of the diffusion plate 23a itself. It is a low value.
  • the LED 24 When the LED 24 is turned on when the liquid crystal display device 10 is used, the light emitted from each LED 24 is incident directly on the back surface 23a1 of the diffusion plate 23a or indirectly by being reflected by the reflection sheet 29. To do. The incident light is transmitted toward the liquid crystal panel 11 from the surface 23a2 after passing through the diffusion plate 23a.
  • the region of the reflection sheet 29 that overlaps the high light transmission region 40 of the diffusing plate 23a in plan view corresponds to the four corners around the abutting portion of the first rising portion 29b1 and the second rising portion 29b2, and is closest to the diffusing plate 23a.
  • This is a region where the amount of incident light is small.
  • the reason for this is that the amount of light reflected on the rising portion 29b itself is small. That is, the rising portion 29b has a longer distance from the light source than the bottom portion 29b on which the LED 24 is disposed, so that light emitted from the LED 24 is less likely to be directly incident, and is incident after being repeatedly reflected a plurality of times. This is because the average number of reflections is larger than the number of reflections of light incident on the low light transmission region 41 facing the bottom 29b.
  • the rising portion 29b is inclined and rises from the bottom portion 29a, the light reflected by the rising portion 29b is not easily incident on the high light transmission region 40 immediately above the rising portion 29b, and thus the amount of incident light is reduced. It is to do.
  • the rising angle of the rising portion 29b from the bottom portion 29a becomes gentle, and from the corner portion 29a1 of the bottom portion 29a. This is because the distance to the corner 22b1 of the chassis 22 becomes longer.
  • the light incident on the diffuser plate 23a disposed in the vicinity of the corner 22b1 is limited to the light reflected by the rising portion 29b. Therefore, the light incident amount in the high light transmission region 40 is in the low light transmission region 41. Less than the amount of incident light.
  • the amount of light incident on the four corners corresponding to the high light transmission region is insufficient, and the amount of light emitted to the liquid crystal panel is naturally reduced.
  • the four corners are visually recognized as dark portions.
  • the low light transmitting portions 42 having different surface areas for the regions 40 and 41 are formed at regular intervals, so that the amount of light entering the diffusing plate 23a is low. It is possible to reduce luminance unevenness that is adjusted by the transmission part 42 and whose four corners are dark parts.
  • the surface area of the low light transmission part 42 b formed on the back surface 23 a 1 that is the incident surface is larger than that of the high light transmission region 40.
  • the surface area of the low light transmission part 42 a formed on the back surface 23 a 1 is smaller than that of the low light transmission region 41. Therefore, even if the incident light amount itself is small, the transmitted light amount (emitted light amount) with respect to the incident light amount is larger than that in the low light transmission region 41.
  • the light transmittance is adjusted by the low light transmission part 42b, and the light amounts emitted from the regions 40 and 41 can be made uniform.
  • the backlight device 12 of the present embodiment accommodates the LED 24, the LED 24, the bottom plate 22 a, the side plate 22 b rising from the peripheral edge of the bottom plate 22 a, and the opening that can emit light from the LED 24 ( A light-transmitting member disposed so as to cover the opening, and is formed on the side plate 22b side and is relatively light-transmitting than the low-light transmitting region 41. And an optical member 23 having a high high light transmission region 40.
  • the high light transmission region 40 is provided on the side plate 22b side of the chassis 22 that is easily visible as a dark portion, that is, the peripheral portion of the optical member 23, the light transmittance in the vicinity of the side plate 22b is low. It becomes higher than the transmission region 41. Thereby, even when the light source light incident on the vicinity of the side plate 22b of the optical member 23 is relatively small, the luminance distribution of the light emitted from the backlight device 12 through the optical member 23 can be made uniform. . Therefore, luminance unevenness at the peripheral edge of the chassis 22 can be reduced.
  • the optical member 23 includes a diffusion plate 23a that diffuses incident light, and the diffusion plate 23a is formed more in the low light transmission region 41 than in the high light transmission region 40 on the back surface 23a1 that is the plate surface on the LED side. And a low light transmission part 42 having a light reflectance higher than that of the diffusion plate 23a.
  • the low light transmission portion 42 reduces the light incident rate of the light incident on the diffusion plate 23a, and as a result, the luminance of the light emitted from the diffusion plate 23a is easily seen as a dark portion. It is possible to match the brightness of the side plate 22b side of 22, that is, the peripheral edge. That is, rather than increasing the light transmittance of the high light transmissive region 40, by forming the low light transmissive portion 42, the light transmittance of the low light transmissive region 41 is lower than the light transmittance of the high light transmissive region 40, The luminance distribution of the light emitted from the diffusion plate 23a is made uniform. In this way, it is possible to improve the luminance unevenness by reducing the light transmittance of the other low light transmission regions 41 without increasing the light transmittance of the high light transmission region 40 itself.
  • the low light transmission part 42 is formed by printing a paste having light reflectivity in a dot shape. If the low light transmission portion 42 is configured by a dot pattern, the degree of transmission (reflection) can be controlled by the pattern mode (number, area, etc.), and therefore the luminance distribution of light emitted from the diffusion plate 23a easily. Can be adjusted.
  • the LED 24 is arranged on the bottom plate 22a, and the emitting direction thereof is the opening direction of the chassis 22 (the opening direction of the light emitting portion, the direction opposite to the bottom plate 22a side). This is particularly useful when the LED 24 is a so-called direct type in which the LED 24 is arranged opposite to the opening from which the light from the LED 24 can be emitted.
  • the bottom plate 22a is opposed to the optical member 23 and includes a reflection sheet 29 that is arranged along the bottom plate 22a and reflects light from the LED 24.
  • the reflection sheet 29 is a rectangular bottom portion that is arranged along the bottom plate 22a. 29a and a rising portion 29b that rises from the adjacent two sides of the bottom portion 29a to the light emitting side of the side plate 22b of the chassis 22 and has a joint J formed between the adjacent side edges, and the high light transmission region 40 rises. It overlaps with the part 29b in plan view.
  • the amount of light incident on the optical member 23 is different between the region of the optical member 23 disposed opposite to the bottom 29a of the reflection sheet 29 and the region of the optical member 23 disposed opposite to the rising portion 29b. That is, the bottom 29a of the reflection sheet 29 is disposed along the bottom plate 22a of the chassis 22, the bottom plate 22a and the opening are opposed, and the optical member 23 is disposed so as to cover the opening. Therefore, the bottom 29a of the reflection sheet 29 is disposed to face the optical member 23, and most of the light reflected by the bottom 29a is incident on the facing optical member 23.
  • the rising portion 29b of the reflection sheet 29 rises from the bottom portion 29a to the light emission side of the side plate 22b of the chassis 22, in the present embodiment in which the optical member 23 is formed of a flat plate, the rising portion 29b.
  • the rising portion 29b always overlaps the optical member 23 with a predetermined angle. Therefore, the light reflected by the rising portion 29b is not easily incident on the optical member 23 directly above, and the region of the optical member 23 disposed opposite to the rising portion 29b is more than the region of the optical member 23 disposed opposite to the bottom portion 29a. It can be explained that the amount of incident light is inevitably reduced. Therefore, it is useful to provide the high light transmission region 40 in the region of the optical member 23 that overlaps the rising portion 29b in plan view.
  • the rising part 29b rises from the bottom part 29a with an inclination.
  • the optical member 23 that overlaps the rising portion 29b in a plan view is compared with, for example, the case where the rising portion 29b rises perpendicularly to the bottom portion 29a.
  • the light transmission area is widened.
  • the light incident rate on the optical member 23 that is overlapped with the rising portion 29b is not sufficiently reflected and may be reduced. It becomes.
  • the optical member is provided by providing the high transmission region 40 in the light transmission region of the optical member 23 superimposed on the rising portion 29b, thereby increasing the light transmittance. It is possible to reduce luminance unevenness of the light emitted from 23.
  • the high light transmission region 40 is formed in a portion of the optical member 23 corresponding to the corner portion 22b1 of the bottom plate 22a of the chassis 22.
  • the corner portion 22b1 of the bottom plate 22a of the chassis 22 is easily visually recognized as a dark portion due to the proximity of the side plate 22b of the chassis 22 and the arrangement of the reflection sheet 29 having an angle with respect to the optical member 23. It is an area. Therefore, if the high light transmission region 40 is directly provided in the corner portion 22b1, it is possible to improve at least the luminance reduction due to the insufficient incident light amount by the high light transmission region 40.
  • the high light transmission region 40 at a position corresponding to a region that is easily visible as a dark part, it is possible to efficiently reduce luminance unevenness.
  • the LED 24 as the light source, it is possible to extend the life of the light source and reduce the power consumption.
  • the low light transmission part 51 formed on the back surface 50a of the diffusion plate 50 is formed so that the individual surface area gradually decreases from the low light transmission region 53 to the high light transmission region 52, as shown in FIG. Yes. Therefore, as shown in FIG. 14, the light transmittance in the high light transmission region (between BC) gradually increases from the light transmittance in the low light transmission region 41 (between AB). In addition, since each light transmittance is adjusted by forming the low light transmission part 51 in the back surface 50a of the diffusion plate 50, it becomes lower than the light transmittance (alpha) of diffusion plate 50 itself.
  • the surface area of the low light transmission portion 51 is gradually reduced toward the high light transmission region 52 so that the ratio of the low light transmission portion 51 in the high light transmission region 52 is naturally that of the low light transmission region 53. Can be made smaller. Further, by gradually reducing the individual surface area of the low light transmission portion 51 over the high light transmission region 52, the light transmittance of the diffusion plate 50 can be gradually increased over the high light transmission region 52, and thus the light is emitted from the diffusion plate 50. In light, a more natural luminance distribution without unevenness can be obtained.
  • the distribution of the low light transmission portion formed on the back surface of the diffusion plate is, for example, low light transmission in the low light transmission region 41 in the first embodiment in the low light transmission region (between AB shown in FIG. 15). Similar to the portion 42b (see FIG. 11), dot-like low light transmission portions are formed with the same surface area at regular intervals. In the high light transmission region (between B and C shown in FIG. 15), the size of each low light transmission portion is gradually decreased from B to C. Therefore, the light transmittance of the diffuser plate exhibits a constant light transmittance in the low light transmission region (between AB), as shown in FIG.
  • the light transmittance in the high light transmission region gradually increases from the boundary line with the low light transmission region (for example, the B line indicated by a two-dot chain line in FIG. 11 or FIG. 13) toward the corner C.
  • the low light transmission part 61 is formed with a predetermined uniform surface area at predetermined intervals. Note that the low light transmission portion 61 is not formed in the high light transmission region 62.
  • Each light transmittance of the diffuser plate 60 having such a configuration is as shown in FIG. That is, the low light transmission region (between AB) has a constant light transmittance that is lower than the light transmittance ⁇ of the diffuser plate 60 by a predetermined value.
  • the high light transmission region between B and C
  • the low light transmission part 61 having a higher reflectance than that of the back surface 60a itself is not formed, the light transmittance is the light transmission of the diffusion plate 60 itself.
  • the rate is the same as the rate.
  • the low light transmission unit 61 can adjust the light transmittance of the other low light transmission regions 63 in accordance with the luminance of the high light transmission regions 62 formed at the four corners that are easily visible as dark portions. Therefore, the brightness of the light emitted from the diffusion plate 60 can be easily made uniform. Further, since the low light transmission portion 61 is not formed in the high light transmission region 62, the cost can be expected to be reduced due to the reduction of the printing region.
  • the diffuser plate 70 has a mode in which the plate thickness of the high light transmission region 71 formed at the four corners gradually becomes thinner toward the corner portion C than the other low light transmission regions 72. Yes.
  • the plate thickness in the low light transmission region 72 is the same as the plate thickness of the first embodiment. Unlike the first embodiment, the low light transmission portion is not formed on the back surface 70a.
  • the light transmittance in the high light transmission region 71 can be increased. That is, the light transmittance of the diffusion plate 70 depends on the thickness of the base material and the distribution density of the diffusion particles.
  • the thickness of the diffusing plate 70 is reduced, the amount of light that passes through the base material in that portion (high light transmission region 71) increases. Assuming that the distribution density of the diffusing particles in the substrate is constant, the number of diffusing particles contained in the high light transmission region 71 is reduced as the plate thickness is reduced. Therefore, the light transmittance can be increased in the high light transmission region 71 even if the number of times the light incident on the high light transmission region 71 is diffused is reduced.
  • the light transmittance in each of the regions 71 and 72 of the diffusion plate 70 is the same light transmittance ⁇ as that in the first embodiment in the low light transmission region 72, and the high light transmission region 71.
  • the light transmittance gradually increases as the plate thickness gradually decreases.
  • the light transmittance can also be increased by reducing the thickness of the diffusion plate 70 in the high light transmission region 71.
  • region 72 is achieved. Since it becomes possible to adjust, the brightness nonuniformity of the light radiate
  • Embodiment 3 of the present invention will be described with reference to FIG.
  • This embodiment is different from the first embodiment in that a low light transmission portion 84 is formed on the back surface 80 a of the diffusion plate 80 via a sheet 81. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.
  • a thin film-like sheet 81 having the same shape as the back surface 80a is attached to the back surface 80a, which is a light incident surface facing the LED 24, of the diffusion plate 80.
  • a low light transmission portion 84 similar to that of the first embodiment is printed on the low light transmission portion forming surface 83 opposite to the adhesive surface 82 with respect to the back surface 80 a of the sheet 81.
  • the sheets 81 themselves other than the low light transmission portion 84 have light transmittance, and do not affect the light transmittance of the diffuser plate 80 to be bonded.
  • any one of the first embodiment and the first modification to the third modification of the first embodiment may be applied.
  • Such a configuration is more versatile than printing a low light transmission portion directly on the diffusion plate 80. That is, even in a backlight device that has already been implemented, the luminance of the high light transmission region can be improved simply by pasting the sheet 81 on which the low light transmission portion 84 is printed to an existing diffusion plate. It is applicable to.
  • FIGS. 4 a fourth embodiment of the present invention will be described with reference to FIGS.
  • This embodiment is different from the first to third embodiments in what is called an edge light type. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.
  • the backlight device 91 has a substantially box-shaped chassis 92 having an opening that opens toward the light emission surface side (the liquid crystal panel 11 side), and a shape that covers the opening of the chassis 92. And an optical member 93 group. Further, in the chassis 92, an LED 94 that is a light source, an LED substrate 95 on which the LED 94 is mounted, a light guide member 96 that guides light from the LED 94 and guides it to the optical member 93 (the liquid crystal panel 11), And a frame 26 that holds the light guide member 96 from the front side.
  • the backlight device 91 is a so-called edge light type (side light type) in which the LED 94 mounted on the LED substrate 95 is disposed at both ends of the light guide member 96.
  • the edge-light type backlight device 91 is integrally assembled to the liquid crystal panel 11 by a bezel 13 having a frame shape, thereby forming a liquid crystal display device 90.
  • the optical member 93 has a horizontally long rectangular shape when viewed in a plane, like the liquid crystal panel 11 and the chassis 92.
  • the optical member 93 is placed on the front side (light emission side) of the light guide member 96 and is interposed between the liquid crystal panel 11 and the light guide member 96.
  • the optical member 93 includes a diffusion plate 93a disposed on the back side and an optical sheet 23b disposed on the front side.
  • the diffusing plate 23a has a structure in which a large number of diffusing particles are dispersed in a substrate made of a substantially transparent resin having a predetermined thickness and has a function of diffusing transmitted light.
  • the LED 94 is a so-called top type in which the LED 94 is mounted on the LED substrate 95 and the surface opposite to the mounting surface with respect to the LED 94 is a light emitting surface.
  • a lens member 97 is provided for emitting light while diffusing it at a wide angle.
  • the lens member 97 is interposed between the LED 94 and the light incident surface 96b of the light guide member 96 and has a light emitting surface that is convex toward the light guide member 96 side. Further, the light emitting surface of the lens member 97 is curved along the longitudinal direction of the light incident surface 96b of the light guide member 96, and the cross-sectional shape is substantially an arc shape.
  • the LED 94 includes an LED chip 94a that emits blue light as a light source, and includes a green phosphor and a red phosphor as phosphors that emit light when excited by blue light.
  • the LED 94 is configured such that an LED chip 94a made of, for example, an InGaN-based material is sealed with a resin material on a substrate portion fixed to the LED substrate 95.
  • the LED board 95 has an elongated plate shape extending along the long side direction of the chassis 92 (X-axis direction, the longitudinal direction of the light incident surface 96b of the light guide member 96).
  • the main plate surface is accommodated in the chassis 92 in a posture parallel to the X-axis direction and the Z-axis direction, that is, in a posture orthogonal to the plate surfaces of the liquid crystal panel 11 and the light guide member 96 (optical member 93).
  • the LED boards 95 are arranged in pairs corresponding to both ends on the long side in the chassis 92, and are attached to the inner surfaces of the long side plates 92b.
  • the LED 94 having the above-described configuration is surface-mounted on the main plate surface of the LED substrate 95 and on the inner side, that is, the surface facing the light guide member 96 side (the surface facing the light guide member 96).
  • a plurality of LEDs 94 are arranged in a line (linearly) in parallel along the length direction (X-axis direction) on the mounting surface of the LED substrate 95. Therefore, it can be said that a plurality of LEDs 94 are arranged in parallel along the long side direction at both ends on the long side of the backlight device 91.
  • each LED 94 Since the pair of LED substrates 95 are housed in the chassis 92 in a posture in which the mounting surfaces of the LEDs 94 are opposed to each other, the light emitting surfaces of the LEDs 94 respectively mounted on the LED substrates 95 are opposed to each other, The optical axis of each LED 94 substantially coincides with the Y-axis direction.
  • the light guide member 96 is made of a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index higher than that of air and substantially transparent (excellent translucency).
  • the light guide member 96 has a horizontally long rectangular shape when viewed in a plane, like the liquid crystal panel 11 and the chassis 92, and the long side direction is the X-axis direction and the short side direction is Y. It is consistent with the axial direction.
  • the light guide member 96 is disposed in the chassis 92 at a position directly below the liquid crystal panel 11 and the optical member 93, and a pair of LED substrates disposed at both ends of the long side of the chassis 92.
  • the light guide member 96 introduces light emitted from the LED 94 in the Y-axis direction, and rises and emits the light toward the optical member 93 side (Z-axis direction) while propagating the light inside. It has a function.
  • the light guide member 96 is formed to be slightly larger than the optical member 93 described above, and its outer peripheral end projects outward from the outer peripheral end surface of the optical member 93 and is pressed by the frame 26 described above. (See FIG. 23).
  • the light guide member 96 has a substantially flat plate shape extending along the plate surfaces of the bottom plate 92a of the chassis 92 and the optical member 93, and the main plate surface thereof is in the X-axis direction. And parallel to the Y-axis direction.
  • the surface facing the front side is a light emitting surface 96 a that emits internal light toward the optical member 93 and the liquid crystal panel 11.
  • both end surfaces on the long side forming a longitudinal shape along the X-axis direction are opposed to the LED 94 (LED substrate 95) with a predetermined interval, respectively.
  • the light incident surface 96b is a surface that is parallel to the X-axis direction and the Z-axis direction, and is a surface that is substantially orthogonal to the light emitting surface 96a. Further, the alignment direction of the LED 94 and the light incident surface 96b coincides with the Y-axis direction and is parallel to the light emitting surface 96a.
  • a second reflection sheet 99 that can reflect the light in the light guide member 96 and rise up to the front side covers the entire area. Is provided.
  • the second reflection sheet 99 is extended to a range where it overlaps with the LED board 95 (LED 94) in plan view, and is arranged in such a manner that the LED board 95 (LED 94) is sandwiched between the first reflection sheet 98 on the front side. Has been. Thereby, the light from LED94 can be efficiently incident with respect to the light-incidence surface 96b by repeatedly reflecting between both reflective sheet 98,99.
  • at least one of the light emitting surface 96a and the opposite surface 96c of the light guide member 96 has a reflecting portion (not shown) that reflects internal light or a scattering portion that scatters internal light (see FIG. (Not shown) is patterned so as to have a predetermined in-plane distribution, whereby the light emitted from the light exit surface 96a is controlled to have a uniform distribution in the surface.
  • the high light transmission region 100 located at both ends in the X-axis direction is set to have a high light transmittance, and the other low light transmission regions 101 have their light transmission higher than that of the high light transmission region 100.
  • the rate is set low.
  • the light transmittance in each of the regions 100 and 101 is adjusted by a low light transmission portion (not shown) formed on the back surface 93a1 of the diffusion plate 93a (the surface facing the light emitting surface 96a of the light guide member 96).
  • the formation ratio in the high light transmission region 100 is low as illustrated in the first embodiment and the first modification to the third modification of the first embodiment.
  • the light transmittance distribution of the diffusion plate 93a shown in FIG. 26 is, for example, as shown in FIG. 11 of the first embodiment, the formation interval of the low light transmission portions is constant, and the dot diameter (surface area) in each of the regions 100 and 101. ) Are the same, and the surface area of the low light transmission portion formed in the high light transmission region 100 is smaller than that formed in the low light transmission region 101.
  • the light transmittance in the high light transmission region 100 (between AB and CD) is relatively higher than the light transmittance in the low light transmission region 101 (between BC).
  • each light transmittance is adjusted by forming the low light transmission part in the back surface 93a1 of the diffusion plate 93a, it becomes a value lower than the light transmittance ⁇ of the diffusion plate 93a itself.
  • the side plate 92b side of the chassis 92 is prevented from being visually recognized as a dark part even in the edge light type backlight device 91 instead of the direct type as in the first to third embodiments. can do.
  • the luminance of the light emitted from the diffusion plate 93a can be made uniform, and the luminance unevenness can be prevented from being visually recognized on the display surface of the liquid crystal panel 11.
  • Embodiments 1 to 3 described above the case where the four corners on the display surface of the liquid crystal panel are visually recognized as dark portions is illustrated, and the diffusion plate region overlapping the four corners is a high light transmission region.
  • the present invention is not limited to this.
  • the entire region that overlaps the rising portion may be a high light transmission region.
  • the low light transmission portion has a circular shape.
  • the shape is not limited to this, and a polygonal shape such as a quadrangle and individual low light transmission portions communicate with each other. Such a shape may be used.
  • the low light transmission part illustrated what formed many at regular intervals it is not restricted to this, For example, the space
  • the dot area of the dot pattern forming the low light transmissive portion should be set to become smaller from the other light transmissive region to the high light transmissive region, or the same throughout the other light transmissive region and the high light transmissive region. Is also possible.
  • the ratio of the low light transmission portion is larger in the other light transmission region than in the high light transmission region, and the light transmittance of the other light transmission region is changed to the light transmittance of the high light transmission region even if the interval is not constant. If it can be suppressed more than that, it is possible to improve the luminance unevenness.
  • the luminance unevenness is reduced by changing the light transmittance of the diffusion plate between the high light transmission region and the low light transmission region. It is also possible to change the light transmittance of the optical sheet constituting the.
  • the present invention includes those in which the distribution density of the diffusion particles in the diffusion plate is changed. That is, when the diffusing plate is made of a resin base material in which diffusing particles are dispersed, the distribution density of the diffusing particles in the high light transmission region is relatively lower than the other light transmission regions. According to such a configuration, the diffusivity of light incident on the high light transmission region can be reduced, and the amount of light emitted from the high light transmission region can be increased. By changing the distribution density of the diffusing particles in this way, it is possible to adjust the luminance distribution of the light emitted from the diffusing plate. It is possible to increase and reduce luminance unevenness.
  • the arrangement order of the colored portions R, G, B, and Y in the color filter 110 can be changed as appropriate.
  • the present invention also includes an arrangement in which the colored portion B, the green colored portion G, the red colored portion R, and the yellow colored portion Y are arranged in this order along the X-axis direction.
  • the colored portions R, G, B, and Y in the color filter 111 are red colored portions R and green colored portions from the left side of FIG.
  • the present invention includes an arrangement in which G, a yellow colored portion Y, and a blue colored portion B are arranged in this order along the X-axis direction.
  • the colored portions R, G, B, and Y in the color filter 112 are red colored portions R
  • An arrangement in which the yellow colored portion Y, the green colored portion G, and the blue colored portion B are arranged in this order along the X-axis direction is also included in the present invention.
  • the color filter has four colored portions. However, as shown in FIG. 31, among the colored portions of the color filter 114, the yellow colored portion is disposed at the installation position. A transparent portion T that does not color transmitted light may be provided. The transparent portion T has substantially the same transmittance for all wavelengths at least in the visible light, so that the transmitted light is not colored into a specific color.
  • the four colored portions R, G, B, and Y constituting the color filter are illustrated along the row direction.
  • the four colored portions R are arranged.
  • G, B, and Y may be arranged in a matrix.
  • the four colored portions R, G, B, and Y are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction, although the dimensions in the row direction (X-axis direction) of the colored portions R, G, B, and Y constituting the color filter 115 are all the same, the colored portions R, G, B, and Y arranged in adjacent rows are the same.
  • the dimensions in the column direction are different from each other.
  • the red colored portion R and the blue colored portion B are arranged adjacent to each other in the row direction, whereas the row having a relatively small size in the column direction.
  • the green colored portion G and the yellow colored portion Y are arranged adjacent to each other in the row direction.
  • the first colored row R and the blue colored portion B are alternately arranged in the row direction, the first row having a relatively large dimension in the column direction, the green colored portion G, and the yellow colored portion Y.
  • second rows having relatively small dimensions in the column direction are alternately arranged in the column direction.
  • the area of the red coloring part R and the blue coloring part B is made larger than the areas of the green coloring part G and the yellow coloring part Y. Further, the green colored portion G is arranged adjacent to the red colored portion R in the column direction, and the yellow colored portion Y is arranged adjacent to the blue colored portion B in the column direction. Yes.
  • the dimensions in the column direction of the pixel electrodes 116 arranged in adjacent rows are different. That is, the area of the pixel electrode 116 that overlaps with the red colored portion R or the blue colored portion B is larger than the area of the pixel electrode 116 that overlaps with the yellow colored portion Y or the green colored portion G. .
  • the film thicknesses of the colored portions R, G, B, and Y are all equal.
  • the source wirings 117 are all arranged at an equal pitch, while the gate wirings 118 are arranged at two pitches according to the dimensions of the pixel electrodes 116 in the column direction. 32 and 33 show a case where the areas of the red colored portion R and the blue colored portion B are about 1.6 times the areas of the yellow colored portion Y and the green colored portion G. Show.
  • the yellow colored portion Y is arranged adjacent to the red colored portion R in the column direction with respect to the color filter 119, It is also possible to adopt a configuration in which the green coloring portion G is arranged adjacent to the blue coloring portion B in the column direction.
  • the color portions R, G, B, and Y constituting the color filter are illustrated with different area ratios.
  • the areas of the colored portions R, G, B, and Y are exemplified.
  • a configuration in which the ratios are made equal is also possible.
  • the colored portions R, G, B, and Y constituting the color filter 120 are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction.
  • the dimensions in the row direction (X-axis direction) of the colored portions R, G, B, and Y are all the same, and the dimensions in the column direction (Y-axis direction) are also the same.
  • the areas of the colored portions R, G, B, and Y are all equal.
  • the color filter 120 is configured as described above, in the array substrate, as shown in FIG. 36, the row direction of each pixel electrode 121 facing each colored portion R, G, B, Y is shown. The dimensions are all equal and the dimensions in the column direction are all equal, so that all the pixel electrodes 121 have the same shape and the same area.
  • the gate wiring 122 and the source wiring 123 are all arranged at an equal pitch.
  • the color filter has four colored portions. However, as shown in FIG. 37, the yellow colored portion of the color filter 124 is omitted.
  • the present invention includes only the three primary colors of light, red (R), green (G), and blue (B). In this case, it is preferable to make the area ratios of the colored portions R, G, and B equal.
  • the structure related to the pixel has been described using the simplified drawings (FIGS. 4 and 5). However, in addition to the structure disclosed in these drawings, the specific structure related to the pixel is changed. Is possible.
  • the present invention can also be applied to a structure in which one pixel is divided into a plurality of sub-pixels and the sub-pixels are driven so as to have different gradation values, so-called multi-pixel driving is performed. Specifically, as shown in FIG. 38, one pixel PX is formed by a pair of subpixels SPX, and the pair of subpixels SPX is formed by a pair of adjacent pixel electrodes with a gate wiring 132 interposed therebetween. 130.
  • a pair of TFTs 131 are formed on the gate wiring 132 corresponding to the pair of pixel electrodes 130.
  • the TFT 131 includes a gate electrode 131a configured by a part of the gate wiring 132, a source electrode 131b configured by a pair of branch lines branched from the source wiring 133 and disposed on the gate electrode 131a, and the gate electrode 131a. And a drain electrode 131c arranged between the pair of source electrodes 131b, and arranged in the direction (Y-axis direction) of the pair of sub-pixels SPX forming one pixel PX on the gate wiring 132. A pair is lined up along.
  • the drain electrode 131c of the TFT 131 is connected to the other end side of the drain wiring 134 having a contact portion 134a connected to the pixel electrode 130 on one end side.
  • the contact part 134a and the pixel electrode 130 are connected through a contact hole CH formed in an interlayer insulating film (not shown) interposed therebetween, and have the same potential.
  • the auxiliary capacitance wiring 135 is arranged at the end opposite to the gate wiring 132 side so as to overlap each other in plan view, and the pixel on which the auxiliary capacitance wiring 135 overlaps is arranged.
  • a capacitance is formed between the electrode 130 and the electrode 130.
  • the pair of pixel electrodes 130 constituting one pixel PX forms a capacitance with different auxiliary capacitance lines 135.
  • Each auxiliary capacitance line 138 in each pixel is connected to each auxiliary capacitance line 135 arranged on the side opposite to the gate line 131 side by a connection line 139, so that the same potential as each auxiliary capacitance line 135 is obtained. ing.
  • the in-pixel auxiliary capacitance wiring 138 having the same potential as the auxiliary capacitance wiring 135 overlaps in a plan view and forms a capacitance between each pixel electrode 130 and each contact portion 134a having the same potential.
  • the scanning signal and the data signal are supplied to the pair of TFTs 131 from the common gate wiring 132 and the source wiring 133, respectively, whereas the pair of pixel electrodes 130 and the pair of contact portions connected to them.
  • the auxiliary capacitance lines 135 and the auxiliary capacitance lines 138 that overlap each of the auxiliary capacitance lines 135a the voltage values charged in the sub-pixels SPX, that is, the gradation values are different from each other. Can be made. Thereby, so-called multi-pixel driving can be performed, and good viewing angle characteristics can be obtained.
  • the coloring portions R, G, B, and Y of the color filter 136 that faces the pixel electrode 130 and the pixel electrode 130 are as follows. It is supposed to be configured. That is, as shown in FIG. 39, the color filter 136 includes four colored portions R, G, B, and Y. From the left side of the drawing, the yellow colored portion Y, the red colored portion R, and the green colored portion. G and blue colored portions B are repeatedly arranged in parallel along the X-axis direction in this order.
  • the colored portions R, G, B, and Y are partitioned by a light shielding layer (black matrix) 137, and the light shielding layer 137 overlaps the gate wiring 132, the source wiring 133, and the auxiliary capacitance wiring 135 in a plan view. Are arranged in a substantially lattice pattern.
  • the yellow colored portion Y and the green colored portion G have substantially the same dimensions in the X-axis direction (the parallel direction of the colored portions R, G, B, and Y).
  • the red colored portion R and the blue colored portion B are relatively larger in dimensions in the X-axis direction than the yellow colored portion Y and the green colored portion G (for example, 1.3 times to 1).
  • the red colored portion R has a slightly larger dimension in the X-axis direction than the blue colored portion B.
  • each pixel electrode 130 has substantially the same size in the Y-axis direction, but the size in the X-axis direction has the colored portions R, G, B of the color filter 136 facing each other. , Y corresponding to the size of Y.
  • the TFT is used as the switching element of the liquid crystal display device.
  • the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)).
  • a switching element other than TFT for example, a thin film diode (TFD)
  • the present invention can be applied to a liquid crystal display device for monochrome display.
  • the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified.
  • the present invention can also be applied to display devices using other types of display panels.
  • the television receiver provided with the tuner is exemplified, but the present invention can be applied to a display device that does not include the tuner.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

Le dispositif d'éclairage de l'invention est caractéristique en ce qu'il est équipé : d'une DEL (source de lumière) (24); d'un châssis (22) qui possède une plaque de fond (22a) qui admet la DEL (24), des plaques latérales (22b) qui s'élèvent à partir de la partie bord périphérique de la plaque de fond (22a) et une partie lumière de sortie qui permet d'émettre en sortie une lumière provenant de la DEL (24); et d'une plaque de diffusion (23a) (élément optique (23)) qui consiste en un élément disposé de sorte à recouvrir la partie lumière de sortie et possédant une perméabilité à la lumière, et qui possède une région de haute perméabilité à la lumière (40) qui est formée côté plaques latérales (22b) et dont le taux de perméabilité à la lumière est relativement plus élevé que celui d'une autre région de perméabilité à la lumière (41).
PCT/JP2012/057163 2011-03-28 2012-03-21 Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision Ceased WO2012133036A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013047374A1 (fr) * 2011-09-28 2013-04-04 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et dispositif récepteur de télévision
EP3705934A1 (fr) * 2019-03-08 2020-09-09 Funai Electric Co., Ltd. Dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0876123A (ja) * 1994-09-02 1996-03-22 Casio Comput Co Ltd 照明装置
JP2008159532A (ja) * 2006-12-26 2008-07-10 Harison Toshiba Lighting Corp バックライト
JP2010021040A (ja) * 2008-07-11 2010-01-28 Epson Imaging Devices Corp 照明装置、液晶装置及び電子機器
WO2011033899A1 (fr) * 2009-09-16 2011-03-24 シャープ株式会社 Dispositif d'éclairage, appareil d'affichage et récepteur de télévision

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0876123A (ja) * 1994-09-02 1996-03-22 Casio Comput Co Ltd 照明装置
JP2008159532A (ja) * 2006-12-26 2008-07-10 Harison Toshiba Lighting Corp バックライト
JP2010021040A (ja) * 2008-07-11 2010-01-28 Epson Imaging Devices Corp 照明装置、液晶装置及び電子機器
WO2011033899A1 (fr) * 2009-09-16 2011-03-24 シャープ株式会社 Dispositif d'éclairage, appareil d'affichage et récepteur de télévision

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013047374A1 (fr) * 2011-09-28 2013-04-04 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et dispositif récepteur de télévision
EP3705934A1 (fr) * 2019-03-08 2020-09-09 Funai Electric Co., Ltd. Dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides

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