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WO2013105710A1 - Unité de rétroéclairage et dispositif d'affichage à cristaux liquides comportant cette unité - Google Patents

Unité de rétroéclairage et dispositif d'affichage à cristaux liquides comportant cette unité Download PDF

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Publication number
WO2013105710A1
WO2013105710A1 PCT/KR2012/006306 KR2012006306W WO2013105710A1 WO 2013105710 A1 WO2013105710 A1 WO 2013105710A1 KR 2012006306 W KR2012006306 W KR 2012006306W WO 2013105710 A1 WO2013105710 A1 WO 2013105710A1
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WO
WIPO (PCT)
Prior art keywords
light
liquid crystal
color
blue
guide plate
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/KR2012/006306
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English (en)
Korean (ko)
Inventor
권진혁
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.)
Industry Academic Cooperation Foundation of Yeungnam University
Original Assignee
Industry Academic Cooperation Foundation of Yeungnam University
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Publication date
Priority claimed from KR1020120084499A external-priority patent/KR101348565B1/ko
Application filed by Industry Academic Cooperation Foundation of Yeungnam University filed Critical Industry Academic Cooperation Foundation of Yeungnam University
Priority to US14/372,023 priority Critical patent/US20150062490A1/en
Publication of WO2013105710A1 publication Critical patent/WO2013105710A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02F1/133621—Illuminating devices providing coloured light
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell

Definitions

  • the present invention relates to a backlight unit (BLU) of a liquid crystal display (LCD), and more particularly, to a backlight unit capable of improving light efficiency of a liquid crystal display and a liquid crystal display including the same. It is about.
  • a liquid crystal display includes a liquid crystal panel for converting various electrical image information into image information by using a change in transmittance of liquid crystal according to an applied voltage, and a backlight unit for supplying light to the liquid crystal panel. It consists of.
  • the plurality of liquid crystal pixels in the liquid crystal panel are composed of R, G, and B liquid crystal subpixels representing red, green, and blue (B, blue) images, respectively.
  • R, G and B color filters are installed on the front of the liquid crystal subpixels.
  • the power of white light emitted from the backlight unit is mostly lost by the polarization sheet, the color filter, and the aperture ratio of the liquid crystal pixels installed in front and behind the liquid crystal pixels, and only about 5% to 10% of the light exits the liquid crystal panel.
  • the optical energy efficiency of the LCD is quite low because it exits. Therefore, improving the optical energy efficiency of the LCD is an important task for strengthening the competitiveness of the LCD and saving energy.
  • the color filter has only about 30% transmittance of white light, causing the most light loss, causing high power consumption of the LCD.
  • FSC Field Sequential Color
  • This technology is designed to eliminate the color filter which occupies a large part of the optical energy loss. It uses R, G, and B three-color LEDs as the light source for the backlight, and uses the image signal of the three colors of R, G, and B colors. After separating into signals, R video signal is sent to the liquid crystal panel while the R-LED is turned on, G video signal is sent to the liquid crystal panel while the G-LED is turned on, and B video signal is sequentially sent to the liquid crystal panel while the B-LED is turned on. It is a technology that allows the viewer to feel the color image by spraying at a high speed.
  • the FSC LCD technology has achieved considerable technological advancement through many studies due to the need for a liquid crystal subpixel and a color filter, and the light transmission efficiency is greatly improved.
  • the speed should be about 6 times, and there are problems such as flickering and color break-up of moving images.
  • the applicant of the present invention has applied for a "liquid crystal display device without a color filter (Registration No. 10-0993695, US2009 / 0262280)" and “liquid crystal display device 10-1033071” to improve the efficiency of the liquid crystal.
  • the above patents have a problem that the thickness of the backlight unit is increased due to the direct structure, and a diffusion layer must be provided in the liquid crystal panel.
  • the present invention aims to improve the light transmittance of LCDs using new optical structures and principles that solve the above-mentioned problems of Taira and the major problems of "liquid crystal display device 10-1033071".
  • the present invention was created to solve the above problems, using a light guide plate or direct type backlight, which is easy to manufacture and simple in structure, and uses a lenticular lens array or a color matching sheet between the three-color light source array and the liquid crystal panel.
  • a light guide plate or direct type backlight which is easy to manufacture and simple in structure, and uses a lenticular lens array or a color matching sheet between the three-color light source array and the liquid crystal panel.
  • RGB light is incident into the RGB liquid crystal subpixel and RGB color filter so that the light transmission efficiency is improved. It is an object of the present invention to provide a backlight unit of a liquid crystal display device which improves efficiency.
  • the liquid crystal panel including a plurality of liquid crystal subpixels respectively corresponding to the three colors of light to emit red, green, blue three colors of light,
  • a light guide plate for inducing light by total internal reflection;
  • a plurality of short wavelength light sources disposed on one side of the light guide plate to irradiate short wavelength light into the light guide plate;
  • a three-color light source array disposed on a lower surface or an upper surface of the light guide plate and including a plurality of color conversion materials to excite the short wavelength light emitted from the short wavelength light source to red, green, or blue color;
  • a lenticular lens array sheet disposed between the three-color light source array and the liquid crystal panel and refracting each of three colors of light emitted from the three-color light source array to be incident into the plurality of liquid crystal subpixels.
  • the present invention is disposed in the lower portion of the liquid crystal panel including a plurality of liquid crystal subpixels respectively corresponding to three colors of light to emit red, green, blue three colors of light, a transparent substrate;
  • An array of three-color self-luminous sources arranged in a straight line on a lower surface or an upper surface of the transparent substrate and arranged sequentially and emitting red, green, and blue light;
  • a backlight unit disposed between the three-color self-luminous source array and the liquid crystal panel and including a lenticular lens array sheet for refracting each of three colors of light emitted from the three-color self-emitting source array to be incident into the plurality of liquid crystal subpixels.
  • the present invention is disposed in the lower portion of the liquid crystal panel including a plurality of liquid crystal subpixels respectively corresponding to the three colors of light to irradiate the three colors of red, green and blue, and induces light by total internal reflection
  • a lower light guide plate having a scattering pattern for diffusing light at equal intervals
  • a plurality of short wavelength light sources disposed on one side of the light guide plate to irradiate short wavelength light into the light guide plate
  • the backlight unit includes a color matching sheet disposed between the light guide plate and the liquid crystal panel to convert the light irradiated from the light guide plate into three colors of light and to be refracted to enter the plurality of liquid crystal subpixels.
  • the present invention is disposed in the lower portion of the liquid crystal panel including a plurality of liquid crystal subpixels respectively corresponding to the three colors of light to emit red, green, blue three-color light, the diffusion plate for diffusing light;
  • a plurality of short wavelength light sources disposed under the diffusion plate and irradiating short wavelength light to the diffusion plate;
  • the backlight unit includes a color matching sheet disposed between the diffusion plate and the liquid crystal panel to convert light irradiated from the diffusion plate into three colors of light and to be refracted to enter the plurality of liquid crystal subpixels. do.
  • the backlight unit and the liquid crystal display including the same according to the present invention have the following effects.
  • the backlight directly sprays red, green, and blue light onto the liquid crystal subpixels and color filters corresponding to red, green, and blue colors, respectively, using a three-color light source array corresponding to the three-color light sources of red, green, and blue colors.
  • the light transmission efficiency of the liquid crystal display device can be improved.
  • R, G, B phosphors or R, G, B quantum dots (QDs) are used to receive UV LED light and emit R, G, B light, respectively.
  • QDs quantum dots
  • the two-color light of R and G is generated using a phosphor or a quantum dot that receives the light of the blue (B) LED and the blue LED light as the three-color light source array and emits the red (R) and green (G), respectively.
  • Blue light is scattered in a scattering pattern to implement three-color light, thereby achieving high efficiency while maintaining a simple structure.
  • R, G, and B liquid crystal subpixels are supplied with R, G, and B light, respectively, so that R, G, and B color filters can be removed, and color crosstalk between neighboring pixels can be reduced. It can also be maintained without removing the color filter to stabilize the image quality.
  • FIG. 1 is a view showing a first embodiment of the present invention.
  • FIG. 2 is a perspective view of FIG. 1.
  • FIG. 3 is a diagram showing an application example of the first embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a color conversion material and a tricolor light source array.
  • FIG. 5 is a diagram illustrating a second embodiment of the present invention using an OLED or a quantum dot (QD) as a three-color light source.
  • QD quantum dot
  • FIG. 6 is an application example of FIG. 5.
  • FIG. 7 is a view showing a third embodiment of the present invention.
  • FIG. 8 is a view showing a fourth embodiment of the present invention.
  • FIG. 9 is a perspective view illustrating the color matching sheet shown in FIGS. 7 and 8.
  • FIG. 1 is a view showing a first embodiment of the present invention
  • Figure 2 is a perspective view of Figure 1
  • Figure 3 is a view showing an application example of the first embodiment of the present invention
  • Figure 4 is a color conversion material and A three color light source array is shown.
  • a liquid crystal panel 1100 and a backlight disposed under the liquid crystal panel 1100 are formed, and the backlight is positioned on the light guide plate 1200 and the side surface of the light guide plate 1200 to form an interior of the light guide plate 1200.
  • a three-color light source array including a blue LED, which is a short wavelength light source 1300 for irradiating light, and an RGB color converting material 1410; 1410R, 1410G, and 1410B, which are sequentially installed side by side under the light guide plate 1200 ( 1400 and the white reflective layer 1600.
  • the liquid crystal panel 1100 includes a liquid crystal subpixel 1110; 1110R, 1110G and 1110B or a color filter 1120; 1120R, 1120G and 1120B, a front glass substrate 1130, and a rear glass substrate 1160.
  • the lenticular lens array sheet 1500 may include a lens transparent substrate 1510 and a lenticular lens 1520 arranged in a line on the lens transparent substrate 1510.
  • the color converting materials 1410; 1410R, 1410G, and 1410B may be formed of RGB phosphors, RGB quantum dots (QDs), white scattering materials, or a combination thereof.
  • the color converting materials 1410; 1410R, 1410G, and 1410B which are sequentially installed side by side, may be red phosphors, green phosphors, and white scatterers, or red It may be composed of quantum dots, green quantum dots, and white scatterers. Blue can be obtained by simply scattering on white scatterers.
  • the lenticular lens array sheet 1500 may be disposed between the light guide plate 1200 and the liquid crystal panel 1100, and the lenticular lens array sheet 1500 may be integrally formed on the light guide plate 1200.
  • a three-color light source array 1400 including a plurality of RGB color converting materials 1410; 1410R, 1410G, and 1410B sequentially arranged side by side, a lenticular lens 1520 of the lenticular lens array sheet 1500, and a liquid crystal panel ( The RGB liquid crystal subpixel 1110 or RGB color filter 1120 of 1100 should be aligned along the same color.
  • the blue color (e.g., wavelength 470nm) emitted from the blue LED which is the short wavelength light source 1300 proceeds through the total internal reflection of the light guide plate 1200, and is sequentially arranged in a straight line on the lower surface of the light guide plate 1200 in a linear form.
  • the material (1410; 1410R, 1410G, 1410B) will generate RGB light.
  • the blue light emitted from the blue LED is incident on the color converting materials 1410; 1410R, 1410G, and 1410B, and the light emitted downward is emitted from the white reflective layer 1600 under the light guide plate 1200. Reflected by the) to proceed in the upper direction where the liquid crystal panel 1100 is located. Even if the blue LED is replaced with a blue laser diode (LD), its optical function is not significantly different.
  • LD blue laser diode
  • the white reflective layer 1600 may be installed as a separate sheet or may be integrally coated on the lower part of the light guide plate 1200.
  • the red, green, and blue light are respectively disposed in the liquid crystal panel 1100 by the lenticular lens array sheet 1500 disposed thereon, and the respective red, green, and blue liquid crystal subpixels 1110R, 1110G, and 1110B or RGB color filters. It is incident to 1120 to increase the transmittance.
  • light emitted from one color conversion material is uniformly diffused in all directions, and light 1910 traveling upwardly is focused by the lenticular lens 1520 aligned in the vertical direction.
  • Light incident to the same color liquid crystal subpixel 1110G or color filter 1120G located in the vertical direction but diffused in another direction is lost light that does not contribute to improvement in transmittance, or a liquid crystal subpixel of different color.
  • the image quality is reduced by entering the 1110R and 1110B and the color filters 1120R and 1120B.
  • the thickness of the light guide plate 1200 is satisfied to satisfy the color-matching condition.
  • the thickness of the lenticular lens array sheet 1500, t 2 , the vertical separation distance t 3 of the liquid crystal panel 1100 and the backlight unit, and the thickness of the rear glass substrate 1160 of the liquid crystal panel 1100. 4 ) must be set.
  • the horizontal displacement B generated through the separation distance t 3 and the horizontal displacement C generated through the rear glass substrate 1160 of the liquid crystal panel 1100 are given as follows.
  • the color matching condition is that the sum W of A, B, and C is the liquid crystal subpixel (at the point where the oblique light 1920 reaches the liquid crystal subpixel 1110G of the same color (eg, G) or the color filter 1120G). 1110 or 3 times the period P of the color filter 1120.
  • the oblique light 1920 is also incident on the liquid crystal subpixel 1110G or the color filter 1120G of the same color (eg, G), thereby contributing to improving the light transmittance.
  • a method of satisfying the above-mentioned color matching criterion is the thickness of the light guide plate (1200) (t 1), the lenticular lens array thickness of the sheet (1500) (t 2), the vertical distance of the liquid crystal panel 1100 and the light unit (t 3)
  • the thickness t 4 of the rear glass substrate 1160 of the liquid crystal panel 1100 may be adjusted to match the color matching conditions.
  • the color matching condition may be set as follows.
  • FIG. 2 is a perspective view of FIG. 1, wherein one side of the light guide plate 1200 is provided with a blue LED, which is a short wavelength light source 1300, and a three-color light source array 1400; 1400R, 1400G, in order on the bottom surface of the light guide plate 1200. 1400B is installed, and a lenticular lens array sheet 1500 is installed on an upper surface of the light guide plate 1200.
  • the liquid crystal panel 1100 is disposed on an upper portion of the backlight unit including the light guide plate 1200 and the lenticular lens array sheet 1500.
  • the polarizing film attached to the outside of the front glass substrate 1130 and the rear glass substrate 1160 of the liquid crystal panel 1100 is excluded from the drawing.
  • the short wavelength light source 1300 may be installed at both left and right sides of the light guide plate 1200.
  • the three-color light source arrays 1400; 1400R, 1400G, and 1400B are positioned on the bottom surface of the light guide plate 1200. However, the three-color light source arrays 1400; 1400R, 1400G, and 1400B are illustrated. May be disposed on an upper surface of the light guide plate 1200.
  • the three-color light source arrays 1400; 1400R, 1400G, and 1400B are disposed on an upper surface of the light guide plate 1200, and a plurality of blue LEDs, which are short wavelength light sources 1300, are installed on the side surface of the light guide plate 1200. do.
  • a plurality of blue LEDs which are short wavelength light sources 1300, are installed on the side surface of the light guide plate 1200. do.
  • red, green, and blue color converting materials 1410; 1410R, 1410G, and 1410B red, green, and blue light are emitted in various directions.
  • the oblique light displacement W of the liquid crystal subpixel 1110 is
  • the light 1930 emitted from the color conversion material (for example, 1410G) in the vertically upward position where the liquid crystal panel 1100 is located is the liquid crystal subpixel 1110G or the color filter of the same color by the lenticular lens 1520. It enters 1120G and has a high transmittance. Further, the light 1940 obliquely emitted upward is refracted by the surfaces of the lenticular lens 1520 and the liquid crystal panel 1100 disposed according to color matching conditions, and the liquid crystal subpixel 1110G or the color filter 1120G of the same color is also refracted. It enters into and contributes to increase the light transmittance.
  • the color conversion material for example, 1410G
  • the light guide plate 1200 has a right-angle prism array on the bottom surface thereof. 1700).
  • the right angle prism array 1700 includes a plurality of right angle prisms 1710 installed on a bottom surface of the light guide plate 1200 and a reflective layer 1720 selectively coated on a bottom surface of the right angle prism 1710.
  • the light 1950 emitted downward is reflected by the rectangular prism array 1700 twice and then returns to its original position and is incident into the liquid crystal subpixel 1110G or the color filter 1120G of the same color to improve light transmittance. Contribute.
  • the RGB color conversion materials 1410; 1410R, 1410G, and 1410B arrays may be sequentially arranged along the colors of the RGB phosphors or RGB quantum dots, and white scatterers are excluded.
  • the optical structure and color matching conditions are the same as in FIG. 1 or 3.
  • FIG. 4 shows a more detailed structure of the three-color light source array 1400; 1400R, 1400G, and 1400B in FIG. 1 or 3.
  • the RGB phosphor is installed in a fine pattern, and in the region close to the short wavelength light source 1300, the pattern density of the RGB color converting materials 1410; 1410R, 1410G, and 1410B is increased, and the RGB color converting materials 1410 are separated from each other.
  • Uniform fluorescence can be obtained by increasing the pattern density of the 1410R, 1410G, and 1410B or gradually increasing the pattern size of the RGB color conversion materials 1410; 1410R, 1410G, and 1410B.
  • the backlight unit disposed below the liquid crystal panel 2100 includes a lenticular lens array sheet 2500, a transparent substrate 2200, a tricolor self-emitting source array 2300, or a tricolor quantum dot array.
  • an RGB OLED or an RGB quantum dot used as the tricolor self-emitting source array 2300 is excited by currents applied from electrodes disposed on upper and lower surfaces, and emits red, green, and blue light.
  • an encapsulation 2600 is required to prevent water vapor or oxygen.
  • the three colors of light emitted from the RGB OLED are respectively incident by the lenticular lens 2520 into the corresponding RGB liquid crystal subpixel 2110 or RGB color filter 2120 in the liquid crystal panel 2100 to increase transmittance.
  • the thickness of the transparent substrate 2200 in Fig. 5 (t 11), the thickness of the lenticular lens array sheet (2500) (t 12), the vertical distance of the liquid crystal panel 2100 and the light unit (t 13), the liquid crystal panel (2100 It is possible to improve the light transmittance by adjusting the thickness t 14 of the rear glass substrate 2160 of FIG.
  • FIG. 6 shows an application example of the invention of FIG. 5.
  • the difference from FIG. 5 is that the three-color self-emitting source array 2300 is disposed on the substrate, and the lenticular lens array sheet 2500 is disposed between the liquid crystal panel 2100 and the three-color self-emitting source array 2300.
  • the optical principle is the same as in FIG.
  • the structure of FIG. 6 is the same except that the three-color light source arrays 1400; 1400R, 1400G, and 1400B are replaced by the three-color self-emitting source array 2300 in the application example of the first embodiment shown in FIG. The same applies as for condition 2.
  • FIG. 7 illustrates a structure in which the color matching sheet 3500 is positioned between the light guide plate 3200 and the backlight having the plurality of short wavelength light sources 3300 and the liquid crystal panel 3100.
  • the short wavelength light source 3300 of the backlight a blue LED or an ultraviolet LED is used.
  • the blue light emitted from the blue LED which is the short wavelength light source 3300 proceeds while totally reflecting in the light guide plate 3200 and is scattered by the scattering pattern 3210 disposed below the light guide plate 3200 or is disposed on the light guide plate 3200. Reflected by the 3220, the illuminance becomes more uniform by the diffusion sheet 3600 or the light collecting sheet 3700, and is incident into the color matching sheet 3500 after the viewing angle is adjusted.
  • the structure of the light collecting sheet 3700 is often in the form of a microlens array sheet having a microlens array or a prism sheet having a prism array structure.
  • FIG. 8 is a fourth embodiment in which the color matching sheet 4500 is positioned between the direct type backlight having the short wavelength light source 4300 and the liquid crystal panel 4100 without the light guide plate 3200 by applying the third embodiment illustrated in FIG. 7. The structure of the embodiment is shown.
  • the short wavelength light source 4300 a blue LED or an ultraviolet LED is used.
  • the blue light emitted from the blue LED, which is the short wavelength light source 4300 is more uniformly illuminated by the diffusion plate 4200, the diffusion sheet 4600, and the light condensing sheet 4700, and after the viewing angle is adjusted, the inside of the color matching sheet 4500. Incident.
  • the color matching sheets 3500 and 4500 are formed of transparent substrates 3510 and 4510, lenticular lens arrays 3520 and 4520, and three-color fluorescent material arrays 3530 and 4530, and reflective color filters 3540 and 4540. May be further included.
  • the color matching sheets 3500 and 4500 are provided with lenticular lens arrays 3520 and 4520 on top of the transparent substrates 3510 and 4510, and the lenticular lens arrays 3520 and 4510 are provided on the bottom surfaces of the transparent substrates 3510 and 4510. At the same interval as 4520, the linear array of three-color phosphors 3530 and 4530 are installed.
  • the three-color fluorescent substance arrays 3530 and 4530 may include a plurality of fluorescent substances 3530; 3530R, 3530G, and 3530B that excite the short wavelength light emitted from the short wavelength light source 4300 to red, green, or blue.
  • Reflective color filters 3540 and 4540 for filtering light incident to the three-color fluorescent material arrays 3530 and 4530 may be further provided below the three-color fluorescent material arrays 3530 and 4530.
  • Reflecting layers 3534 and 4534 reflecting light incident on the transparent substrates 3510 and 4510 are disposed between the fluorescent materials 3530 and 3530R, 3530G and 3530B of the three-color phosphor array 3530 and 4530. do.
  • the color matching sheets 3500 and 4500 are arranged such that the three-color fluorescent material arrays 3530 and 4530 are aligned to match the same colors as the color filters 3120 and 4120 of the liquid crystal panels 3100 and 4100 and are lenticular.
  • the lens arrays 3520 and 4520 may also be sequentially arranged in the same cycle as the liquid crystal subpixels 3110 and 4110 or the color filters 3120 and 4120.
  • the color matching sheets 3500 and 4500 contribute to the improvement of the light transmittance of the liquid crystal panels 3100 and 4100 as follows.
  • the blue light emitted from the blue LEDs which are short wavelength light sources 3300 and 4300, becomes uniform by the light guide plate 3200 or the diffusion plate 4200, the diffusion sheets 3600 and 4600, and the light collecting sheets 3700 and 4700, and proceeds upwards.
  • the three-color fluorescent material arrays 3530 and 4530 may emit red, green, and blue light according to the arrangement order by the blue light.
  • the blue fluorescent material 3532B among the three-color fluorescent material arrays 3530 and 4530 may use a white scattering body that causes only scattering or is transparent. You may leave it as it is.
  • the generated red, green, and blue light are collected by the lenticular lenses of the corresponding lenticular lens arrays 3530 and 4520 into the corresponding red, green, and blue color filters 3120 and 4120 in the liquid crystal panels 3100 and 4100, respectively.
  • the incident light causes the light transmittance of the liquid crystal panels 3100 and 4100 to increase. If the ultraviolet LED is used as a light source, the three-color phosphor arrays 3530 and 4530 use red, green, and blue phosphors.
  • the thickness (t 21 , t 31 ) of the color matching sheets (3500, 4500), the interval (t 23 , t 33 ) between the color matching sheets (3500, 4500) and the liquid crystal panels (3100, 4100), the liquid crystal panel (3100) The relationship between the thicknesses t 24 and t 34 of the rear glass substrates 3160 and 4160 of the 4100, the incident angle ⁇ , and the refraction angle ⁇ is
  • n is the refractive index of the back glass substrates 3160 and 4160 and the transparent substrates 3510 and 4510.
  • the color matching condition 3 the thickness t 21 of the color matching sheets 3500 and 4500, the interval t 23 between the color matching sheets 3500 and 4500 and the liquid crystal panels 3100 and 4100, and the liquid crystal panel (
  • the thickness t 24 of the rear glass substrates 3160 and 4160 of the 3100 and 4100 is expressed based on the third embodiment
  • the color matching condition 4 of the fourth embodiment is also the same as the color matching condition 3 of the third embodiment. , Detailed description thereof will be omitted.
  • the red, green, and blue fluorescence emitted from the three-color fluorescent material arrays 3530 and 4530 is uniformly emitted up and down, so that blue passes through the lower portion of the color matching sheets 3500 and 4500, and red and green are passed.
  • the light efficiency can be further improved by adding reflective color filters 3540 and 4540 for reflecting silver.
  • the reflective color filters 3540 and 4540 may be integrated with the color matching sheets 3500 and 4500.
  • Some of the blue light incident into the color matching sheets 3500 and 4500 hits the reflective layers 3534 and 4534 to reflect the reflected light, which is then reflected by the reflective sheet 3220 at the bottom of the light guide plate 3200 or the diffuser plate 4200. 4800 is reflected and recycled to enter the three-color phosphor array 3530 and 4530 again.
  • Phosphors, quantum dots, white scattering beads, and the like may be used as the phosphors of the three-color phosphor arrays 3530 and 4530.
  • the backlight unit directly sprays red, green, and blue light onto the liquid crystal subpixels and color filters corresponding to the red, green, and blue colors, respectively, using the three-color light source array corresponding to the red, green, and blue three-color light sources. Through this, the light transmission efficiency of the liquid crystal display device can be improved.
  • the present invention can be used in a backlight unit (BLU) of a liquid crystal display (LCD).
  • BLU backlight unit
  • LCD liquid crystal display

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
PCT/KR2012/006306 2012-01-13 2012-08-08 Unité de rétroéclairage et dispositif d'affichage à cristaux liquides comportant cette unité Ceased WO2013105710A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/372,023 US20150062490A1 (en) 2012-01-13 2012-08-08 Backlight unit and liquid crystal display device including same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2012-0004232 2012-01-13
KR20120004232 2012-01-13
KR1020120084499A KR101348565B1 (ko) 2012-01-13 2012-08-01 백라이트 유닛 및 이를 포함하는 액정표시장치
KR10-2012-0084499 2012-08-01

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017080077A1 (fr) * 2015-11-13 2017-05-18 深圳市华星光电技术有限公司 Procédé de préparation de substrat de film coloré à points quantiques, et substrat de film coloré à points quantiques
CN107092134A (zh) * 2017-06-07 2017-08-25 深圳Tcl新技术有限公司 背光模组和显示装置
CN109725457A (zh) * 2017-10-31 2019-05-07 乐金显示有限公司 背光单元及包括该背光单元的液晶显示装置
CN110208886A (zh) * 2019-05-23 2019-09-06 广东聚华印刷显示技术有限公司 光提取结构制造方法、像素结构和显示面板

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005221619A (ja) * 2004-02-04 2005-08-18 Toppan Printing Co Ltd 光学シート及びバックライト、並びに液晶表示装置
KR20070020725A (ko) * 2005-08-16 2007-02-22 삼성전자주식회사 컬러필터 불요형 액정 디스플레이 장치
KR20090028454A (ko) * 2007-09-13 2009-03-18 가부시키가이샤 히타치세이사쿠쇼 조명장치 및 액정표시장치
KR20110115255A (ko) * 2010-04-15 2011-10-21 희성전자 주식회사 액정표시장치
KR101089970B1 (ko) * 2010-07-09 2011-12-05 영남대학교 산학협력단 마이크로 렌즈 어레이 패널 및 이를 이용한 액정표시장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005221619A (ja) * 2004-02-04 2005-08-18 Toppan Printing Co Ltd 光学シート及びバックライト、並びに液晶表示装置
KR20070020725A (ko) * 2005-08-16 2007-02-22 삼성전자주식회사 컬러필터 불요형 액정 디스플레이 장치
KR20090028454A (ko) * 2007-09-13 2009-03-18 가부시키가이샤 히타치세이사쿠쇼 조명장치 및 액정표시장치
KR20110115255A (ko) * 2010-04-15 2011-10-21 희성전자 주식회사 액정표시장치
KR101089970B1 (ko) * 2010-07-09 2011-12-05 영남대학교 산학협력단 마이크로 렌즈 어레이 패널 및 이를 이용한 액정표시장치

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017080077A1 (fr) * 2015-11-13 2017-05-18 深圳市华星光电技术有限公司 Procédé de préparation de substrat de film coloré à points quantiques, et substrat de film coloré à points quantiques
CN107092134A (zh) * 2017-06-07 2017-08-25 深圳Tcl新技术有限公司 背光模组和显示装置
CN109725457A (zh) * 2017-10-31 2019-05-07 乐金显示有限公司 背光单元及包括该背光单元的液晶显示装置
CN109725457B (zh) * 2017-10-31 2021-11-26 乐金显示有限公司 背光单元及包括该背光单元的液晶显示装置
CN110208886A (zh) * 2019-05-23 2019-09-06 广东聚华印刷显示技术有限公司 光提取结构制造方法、像素结构和显示面板

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