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WO2012002034A1 - Dispositif de rétroéclairage et dispositif d'affichage - Google Patents

Dispositif de rétroéclairage et dispositif d'affichage Download PDF

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Publication number
WO2012002034A1
WO2012002034A1 PCT/JP2011/060387 JP2011060387W WO2012002034A1 WO 2012002034 A1 WO2012002034 A1 WO 2012002034A1 JP 2011060387 W JP2011060387 W JP 2011060387W WO 2012002034 A1 WO2012002034 A1 WO 2012002034A1
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WO
WIPO (PCT)
Prior art keywords
light guide
light
guide bar
display panel
backlight device
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/JP2011/060387
Other languages
English (en)
Japanese (ja)
Inventor
増田　岳志
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 WO2012002034A1 publication Critical patent/WO2012002034A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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

Definitions

  • the present invention relates to a backlight device and a display device, and more particularly to a backlight device and a display device including a light source and a light guide rod for guiding light from the light source.
  • backlight devices that illuminate a display panel.
  • the light source is two-dimensionally (planar) arranged at a position directly below the display panel. Further, in a direct type backlight device, it is difficult to reduce the number of light sources in order to ensure uniformity of illumination light while suppressing an increase in the thickness of the backlight device. For this reason, it is difficult to reduce the weight of the backlight device, and it is difficult to reduce the cost.
  • the edge light type backlight device a light guide plate is arranged at a position directly below the display panel, and a light source is arranged around the light guide plate. For this reason, in the edge light type backlight device, the number of light sources can be reduced as compared with the direct type backlight device.
  • the light guide plate is usually formed by a single member having an area approximately the same as that of the display panel.
  • a plurality of light guide bars are connected to each other.
  • a structure in which a light guide is configured so as to be in contact with each other is also known.
  • the light guide plate and the light guide body composed of a plurality of light guide bars have the same area as the display panel, and thus it is difficult to reduce the weight of the backlight device. There is a problem. It is also difficult to reduce costs.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a backlight device and a display device that can be reduced in weight while ensuring the uniformity of illumination light. Is to provide.
  • a backlight device is a backlight device disposed on the back side of a display panel, and a plurality of light sources and light from the light sources are incident thereon.
  • a plurality of light guide bars that have a light incident surface and guide light from the light source, and the plurality of light guide bars are arranged at a predetermined interval from each other.
  • a light emitting processing unit is provided that extends along the direction in which the light rod extends and changes the traveling direction of light from the light source to a direction suitable for external emission.
  • the side of the light guide bar is provided on one side of the side opposite to the display panel and the part on the side of the display panel. It is not provided in at least a part of the other.
  • the backlight device by providing a plurality of light guide bars for guiding light from the light source, unlike the direct-type backlight device, the light source is directly below the display panel. Since it is not necessary to arrange in the position, the thickness of the backlight device and the display device can be reduced.
  • the plurality of light guide bars are arranged at a predetermined interval from each other, thereby reducing the area of the plurality of light guide bars, for example, the area of the display panel. Therefore, the backlight device can be reduced in weight. In addition, the cost of the backlight device can be reduced.
  • the uniformity of the illumination light may be reduced if the thickness of the backlight device is reduced.
  • the light emission processing portion is provided on one of the side portion of the light guide bar opposite to the display panel and the portion on the display panel side.
  • the light guide bar is not provided on at least a part of the other part of the part opposite to the display panel and the part on the display panel side. For this reason, it is possible to control (set) whether light is emitted from the portion of the side of the light guide bar opposite to the display panel or the part on the display panel side.
  • the optical path length until the emitted light reaches the display panel (or the optical member) can be controlled. Thereby, since the light radiate
  • the light emitting processing portion is provided on a portion of the side surface of the light guide bar opposite to the display panel, and on the side surface of the light guide bar. Of these, it is not provided in at least a part of the portion on the display panel side.
  • the light path length until the light emitted from the light guide bar reaches the display panel (or optical member) can be increased, so that the light emitted from the light guide bar can be easily displayed.
  • a wide range of panels (or optical members) can be reached. Thereby, it can suppress easily that the uniformity of illumination light falls.
  • an optical member disposed on the display panel side of the light guide bar and a reflection member disposed on the side opposite to the display panel of the light guide bar are further provided, from the light guide bar to the optical member.
  • the distance is larger than the distance from the light guide rod to the reflecting member.
  • the light emission processing portion is provided in a portion on the display panel side of the side surface of the light guide bar, and is displayed on the side surface of the light guide bar. It is not provided in at least a part of the part opposite to the panel, and the light from the light source is emitted from the light guide bar mainly toward the side opposite to the display panel. If comprised in this way, since the light radiate
  • an optical member disposed on the display panel side of the light guide bar and a reflection member disposed on the side opposite to the display panel of the light guide bar are further provided, from the light guide bar to the optical member.
  • the distance is smaller than the distance from the light guide rod to the reflecting member.
  • the light emitting processing portion is provided on the other side of the side of the light guide bar opposite to the display panel and the portion on the display panel side. Absent. If comprised in this way, it can be controlled effectively from which part of the side of a light guide rod the part on the opposite side to a display panel, and the part by the side of a display panel radiate
  • the light guide bar is formed in a tapered shape. If comprised in this way, since it can suppress that a light radiate
  • the light emitting processing portion is formed in a strip shape having a width substantially the same as the length of one side of the tip surface of the light guide bar. ing. If comprised in this way, the width
  • the side surface of the light guide rod may be formed in a dogleg shape when viewed from the side opposite to the light incident surface of the light guide rod.
  • the side surface of the light guide rod is formed in a U shape when viewed from the side opposite to the light incident surface of the light guide rod
  • the side surface includes a first side surface portion and a first side surface portion.
  • the second side surface portion disposed on the side opposite to the display panel of the one side surface portion, and the light emitting processing portion is provided only on one of the second side surface portion and the first side surface portion.
  • the light emission processing part is not easily provided on at least a part of the side part of the light guide bar opposite to the display panel and the other part of the display panel side, Of the side surfaces of the light guide bar, the light guide bar can be provided on one of the part on the opposite side of the display panel and the part on the display panel side.
  • the backlight device further includes a holding member that holds the light incident surface side portion of the light guide rod, and the light guide rod is provided with a convex portion. Is provided with an engaging recess that engages with the convex portion of the light guide rod. If comprised in this way, since a light guide bar can be positioned in the predetermined position of a holding member, the assembly workability
  • the backlight device preferably further includes a holding member that holds a portion of the light guide bar on the light incident surface side, and the holding member restricts the light guide bar from moving to the light source side.
  • the control part which suppresses that a light-guide rod contacts a light source is provided. If comprised in this way, it can suppress that a light guide bar moves to the light source side, and can suppress that a light guide bar contacts a light source.
  • the backlight device preferably further includes an optical member disposed on the display panel side of the light guide bar, and a holding member that holds a portion of the light incident surface side of the light guide bar.
  • the member is disposed on the surface of the holding member on the display panel side. If comprised in this way, it can suppress that a number of parts increases compared with the case where the member which mounts an optical member is provided separately.
  • the backlight device preferably further includes a clip for holding the light guide bar. If comprised in this way, it can suppress that a light guide bar moves or curves.
  • the plurality of light guide bars are connected by a connecting portion. If comprised in this way, a number of parts can be reduced compared with the case where the some light guide bar is formed separately. In addition, since the plurality of light guide bars and the plurality of light sources can be aligned at the same time by connecting the plurality of light guide bars with the connecting portion, the assembly workability of the backlight device can be improved. .
  • the backlight device in which the plurality of light guide bars are connected by the connecting portion, preferably, the backlight device further includes a clip for holding the connecting portion.
  • the clip does not hinder light from being emitted from the light guide bar, so compared to the case where the light guide bar is held by the clip.
  • the uniformity of the illumination light can be improved.
  • a part of light which passes the inside of a light guide rod goes back and forth between adjacent light guide rods via a connection part.
  • the amount of light passing through the connecting portion is less than the light passing through the light guide rod. For this reason, as described above, the amount of light absorbed by the clip can be reduced by holding the connecting portion by the clip as compared to the case where the light guide bar is held by the clip. Thereby, the loss of light can be reduced.
  • the connecting portion is provided with a protruding portion extending in a direction intersecting with the extending direction of the connecting portion, It is held by a clip.
  • intersects the extending direction of a connection part is provided in the connection part, a part of light which passes the inside of a connection part approachs into a protrusion part. Since the light entering the projecting portion is less than the light passing through the connecting portion, holding the projecting portion with the clip reduces the amount of light absorbed by the clip as compared to holding the connecting portion with the clip. The amount can be reduced. Thereby, the loss of light can be further reduced.
  • the protruding portion is preferably formed so as to extend in parallel with the extending direction of the light guide rod. If comprised in this way, a protrusion part can be moved (sliding) with respect to a clip in parallel with the direction where a light-guide rod is extended. Thereby, when the light guide bar expands and contracts due to heat, the light guide bar can be prevented from being deformed (for example, the light guide bar is bent).
  • a display device includes the backlight device configured as described above and a display panel illuminated by the backlight device. If comprised in this way, the display apparatus which can be reduced in weight can be obtained, ensuring the uniformity of illumination light.
  • FIG. 1 is a cross-sectional view illustrating a schematic structure of a liquid crystal display device according to a first embodiment of the present invention.
  • FIG. 2 is a plan view for explaining the structure of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is an exploded perspective view showing structures of a light guide bar and a holding member of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is a perspective view illustrating a structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention illustrated in FIG. 1.
  • FIG. 1 is a cross-sectional view illustrating a schematic structure of a liquid crystal display device according to a first embodiment of the present invention.
  • FIG. 2 is a plan view for explaining the structure of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is an exploded
  • FIG. 2 is a side view illustrating a structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention illustrated in FIG. 1.
  • FIG. 3 is an enlarged front view for explaining the structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is an enlarged perspective view showing a structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is an enlarged view showing a structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 1 is a side view illustrating a structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention illustrated in FIG. 1.
  • FIG. 3 is an enlarged front view for explaining the structure of a light guide bar of the backlight device of
  • FIG. 2 is a plan view showing a structure of a light guide bar of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is a cross-sectional view illustrating a structure of a backlight device of the liquid crystal display device according to the first embodiment of the present invention illustrated in FIG. 1.
  • FIG. 4 is an enlarged cross-sectional view showing a structure of a back side holding member of the holding member shown in FIG. 3. It is the enlarged front view which showed the structure of the back side holding member of the holding member shown in FIG.
  • FIG. 4 is an enlarged cross-sectional view illustrating a structure of a cover member of the holding member illustrated in FIG. 3.
  • FIG. 2 is a plan view showing structures of light guide bars and clips of the backlight device of the liquid crystal display device according to the first embodiment of the present invention shown in FIG. 1.
  • FIG. 2 is an enlarged cross-sectional view illustrating structures of light guide bars and clips of the backlight device of the liquid crystal display device according to the first embodiment of the present invention illustrated in FIG. 1. It is the disassembled perspective view which showed the structure of the light guide rod and holding member of the backlight apparatus of the liquid crystal display device by 2nd Embodiment of this invention.
  • FIG. 17 is a perspective view illustrating a structure of a light guide bar of the backlight device of the liquid crystal display device according to the second embodiment of the present invention illustrated in FIG. 16.
  • FIG. 17 is a side view illustrating a structure of a light guide bar of the backlight device of the liquid crystal display device according to the second embodiment of the present invention illustrated in FIG. 16.
  • FIG. 17 is an enlarged front view for explaining a structure of a light guide bar of the backlight device of the liquid crystal display device according to the second embodiment of the present invention shown in FIG. 16.
  • FIG. 17 is an enlarged perspective view illustrating a structure of a light guide bar of the backlight device of the liquid crystal display device according to the second embodiment of the present invention illustrated in FIG. 16. It is the perspective view which showed the structure of the light guide rod of the backlight apparatus of the liquid crystal display device by 3rd Embodiment of this invention. It is the side view which showed the structure of the light guide bar shown in FIG.
  • FIG. 25 is an enlarged perspective view showing the structure of the light guide rod shown in FIG. 24. It is the perspective view which showed the structure of the light guide rod of the backlight apparatus of the liquid crystal display device by 5th Embodiment of this invention. It is the side view which showed the structure of the light guide bar shown in FIG.
  • FIG. It is an enlarged front view for demonstrating the structure of the light guide bar shown in FIG. It is the top view which showed the structure of the light guide bar and clip of the backlight apparatus of the liquid crystal display device by 6th Embodiment of this invention. It is the top view which showed the structure of the light guide bar and clip of the backlight apparatus of the liquid crystal display device by 7th Embodiment of this invention. It is the top view which showed the structure of the light guide bar and clip of the backlight apparatus of the liquid crystal display device by 8th Embodiment of this invention. It is a top view for demonstrating the structure of the backlight apparatus of the liquid crystal display device by the 1st modification of this invention.
  • the liquid crystal display device 1 includes a liquid crystal display panel 2 and a backlight device 10 that illuminates the liquid crystal display panel 2 as shown in FIG.
  • the liquid crystal display device 1 is an example of the “display device” in the present invention
  • the liquid crystal display panel 2 is an example of the “display panel” in the present invention.
  • the liquid crystal display panel 2 includes an AM substrate (active matrix substrate) 2a and a counter substrate 2b disposed to face the AM substrate 2a.
  • a liquid crystal (not shown) is sealed between the AM substrate 2a and the counter substrate 2b.
  • Polarizing films 2c and 2d are provided on the light receiving surface (back surface) side of the AM substrate 2a and the light emitting surface (front surface) side of the counter substrate 2b, respectively.
  • the liquid crystal display panel 2 functions as a display panel when illuminated by the backlight device 10.
  • the backlight device 10 is an edge light (side light) type backlight device, and includes a plurality of bar-shaped light guide bars 20 and a plurality of light sources arranged to face a light incident surface 21a (described later) of the light guide bar 20. 30, the reflection sheet 11 disposed on the rear side (lower side) of the light guide bar 20, the diffusion plate 12 and the optical sheet 13 disposed on the front side (upper side) of the light guide bar 20, and the light guide bar 20
  • the holding member 40 (refer FIG. 3) holding the holding
  • the reflection sheet 11 is an example of the “reflection member” in the present invention, and the diffusion plate 12 and the optical sheet 13 are examples of the “optical member” in the present invention. In FIG. 1, the holding member 40 is omitted.
  • the light guide rod 20 is formed of a light-transmitting resin or the like, and has a function of guiding light while totally reflecting light from the light source 30 and emitting the light from a light emitting unit 22 described later.
  • the detailed structures of the light guide bar 20 and the holding member 40 will be described later.
  • the light source 30 is configured to emit light toward the light guide bar 20.
  • the light source 30 is configured by, for example, a white LED (Light Emitting Diode) that emits white light.
  • the light source 30 may be composed of, for example, a red light emitting element, a green light emitting element, and a blue light emitting element, or may be composed of a blue light emitting element and a phosphor that converts part of the blue light into yellow light. May be.
  • the plurality of light sources 30 are attached to the mounting substrate 31 as shown in FIG.
  • two mounting substrates 31 are arranged on one side in the short side direction (A direction) of the liquid crystal display panel 2 (see FIG. 1).
  • the backlight device 10 is configured so that the intensity of light emitted from the light source 30 can be adjusted for each light source 30. For this reason, since it is possible to control the intensity of illumination light for each of the plurality of light guide bars 20 according to the display image, it is possible to increase the contrast of the display image and It is possible to reduce power consumption.
  • the reflection sheet 11 has a function of reflecting, to the liquid crystal display panel 2 side, light that travels toward the side opposite to the liquid crystal display panel 2 out of the light emitted from the light guide bar 20. .
  • the diffusion plate 12 has a function of diffusing light from the light guide rod 20 (or the reflection sheet 11) and emitting it to the liquid crystal display panel 2 side (optical sheet 13 side).
  • the optical sheet 13 is composed of, for example, a plurality of sheets such as a prism sheet and a lens sheet, and has a function of condensing light from the diffusion plate 12 at a predetermined viewing angle.
  • the diffusion plate 12 and the optical sheet (such as a prism sheet or a lens sheet) 13 are provided as necessary and may be omitted.
  • the backlight chassis 50 is formed, for example, by bending a metal plate.
  • the plurality of light guide bars 20 are arranged so as to extend in the short side direction (A direction) of the liquid crystal display panel 2 (see FIG. 1).
  • the liquid crystal display panel 2 is disposed at a predetermined interval in the longitudinal direction (B direction (direction orthogonal to the A direction)).
  • a plurality of light guide bars 20 are arranged along the longitudinal direction (B direction) of the liquid crystal display panel 2, and one light guide bar 20 is arranged along the short direction (A direction) of the liquid crystal display panel 2. ing.
  • the light guide bar 20 includes a holding portion 21 held by a holding member 40 (see FIG. 3) and a light emitting portion 22 that emits light from the light source 30 (see FIG. 2). It is out.
  • the holding part 21 is formed in a rectangular parallelepiped shape, for example. Specifically, as shown in FIGS. 4 and 5, the holding unit 21 includes a light incident surface 21a on which light emitted from the light source 30 (see FIG. 2) is incident, a front surface (upper surface) 21b, and a rear surface ( Lower surface) 21c and a pair of side surfaces 21d.
  • the light incident surface 21a is formed perpendicular to the A direction.
  • the front surface 21b and the back surface 21c are formed in parallel to each other, and are formed perpendicular to the thickness direction (C direction) of the backlight device 10.
  • the pair of side surfaces 21 d are formed in parallel to each other and are formed perpendicular to the B direction.
  • a convex portion 21e protruding downward is formed on the back surface 21c.
  • the convex portion 21e may have a hemispherical shape or other shapes.
  • the light emitting portion 22 (light guide rod 20) is formed in a tapered shape (tapered shape).
  • the light emitting unit 22 includes a front end surface 22a formed on the side opposite to the light incident surface 21a of the holding unit 21 (the side opposite to the light source 30), and a front surface (upper surface) 22b (see FIG. 5). And a back surface (lower surface) 22c (see FIG. 5) and a pair of side surfaces 22d (see FIGS. 5 and 6).
  • the front end surface 22a is formed perpendicular to the A direction. Further, the tip surface 22 a is formed to have an area smaller than the light incident surface 21 a of the holding unit 21. Further, as shown in FIG. 6, the length in the C direction of the tip surface 22a is smaller than half of the length in the C direction of the light incident surface 21a (see FIG. 5) of the holding portion 21.
  • the back surface 22 c is formed perpendicular to the C direction and is formed on the same plane as the back surface 21 c of the holding portion 21.
  • the front surface 22b is formed so as to be inclined with respect to the front surface 21b of the holding portion 21, and the distance between the front surface 22b and the back surface 22c as the distance from the light incident surface 21a increases. Is formed to be small.
  • the pair of side surfaces 22d are formed so as to be inclined with respect to the side surface 21d of the holding portion 21, and formed such that the distance from each other decreases as the distance from the light incident surface 21a increases. Has been.
  • the traveling direction of light from the light source 30 is changed to a direction suitable for external emission.
  • the processed portion 22e is formed. That is, the processing unit 22e has a function of refracting or reflecting light guided while being totally reflected so that the light can be emitted to the outside without being totally reflected. For this reason, for example, as shown in FIG. 8, the light that has reached the processed portion 22e on one side surface 22d is mainly emitted from the surface (the other side surface 22d) disposed opposite to the one side surface 22d.
  • the hatched areas in FIGS. 4 to 7 show the processed portion 22e.
  • the processed portion 22e is an example of the “light emitting processed portion” in the present invention.
  • the processed portion 22 e is formed so as to extend along the direction in which the light guide bar 20 extends.
  • the processed portion 22e is formed in a belt shape having a width that is substantially the same as the length in the thickness direction (C direction) of the distal end surface 22a. That is, the processed portion 22e is formed in a belt shape having a width that is substantially the same as the length of one side of the tip end surface 22a.
  • the processing unit 22e may be formed of, for example, a plurality of triangular prisms, or a lens (not shown) or white ink (white paint) is used instead of a prism. You may form by the dot part (not shown) by dot type printing processing.
  • the traveling direction of the light from the light source 30 is changed by being refracted or reflected by the processing unit 22e, and is not emitted to the outside because the total reflection condition is not satisfied.
  • the processed portion 22e is formed by a dot portion by dot printing, the traveling direction of the light from the light source 30 is changed by being reflected or diffused by the processed portion 22e, and the total reflection condition is not satisfied and is externally provided. Emitted.
  • the light emitted from the light guide rod 20 (processed portion 22e) is emitted in a state having a predetermined emission angle distribution in the C direction as shown in FIG.
  • region enclosed with the dashed-dotted line of FIG. 6 has shown the output angle distribution of the C direction of the light radiate
  • the illumination light reaches the diffusion plate 12 in a wider range.
  • the backlight device 10 is formed so that the optical path length until the light emitted from the light guide rod 20 reaches the diffusion plate 12 is increased.
  • the processed portion 22 e is provided on the lower portion of the side surface 22 d of the light emitting portion 22 (of the side surface 22 d on the side opposite to the liquid crystal display panel 2. Is not formed on the portion above the side surface 22d (the portion on the liquid crystal display panel 2 side of the side surface 22d). That is, the processed portion 22e is formed in a portion below the center of the light guide bar 20 in the C direction, but is not formed in a portion above the center of the light guide bar 20 in the C direction.
  • the light guide rod 20 is arranged such that the distance from the light guide rod 20 (front surface 21b) to the diffusion plate 12 is larger than the distance from the light guide rod 20 (back surface 21c) to the reflection sheet 11. 20 is arranged.
  • the light emitting portion 22 (light guide rod 20) is formed in a tapered shape (tapered shape), as shown in FIG. Is likely to reach the processed portion 22e (see FIG. 8) of the light emitting portion 22, and the probability of reaching the tip surface 22a is reduced.
  • the holding portion 21 of the light guide bar 20 is held by a holding member 40.
  • the holding member 40 includes a back-side holding member 41 disposed on the back surface 21 c side of the holding portion 21 of the light guide bar 20, and a cover member 42 that covers the front surface 21 b side of the holding portion 21.
  • the back side holding member 41 and the cover member 42 are made of, for example, white polycarbonate resin and have a function of reflecting light.
  • the back side holding member 41 is formed in a substantially rectangular parallelepiped shape extending in the B direction.
  • the back side holding member 41 is formed with concave portions 41a for holding the holding portion 21 of the light guide bar 20 at a predetermined pitch in the B direction.
  • the concave portion 41a is formed with, for example, a hemispherical engaging concave portion 41b that engages with the convex portion 21e (see FIG. 10) of the light guide rod 20.
  • the engaging recess 41b is used for positioning the light guide bar 20 when the backlight device 10 is assembled.
  • the engaging recess 41b has a function of suppressing the light guide bar 20 from moving in the A direction.
  • an opening 41 c is formed in the back side holding member 41 so as to face the light incident surface 21 a (see FIG. 10) of the light guide bar 20.
  • the light source 30 is fitted into the opening 41c from the outside.
  • a restricting portion 41d for restricting the light guide rod 20 from moving to the light source 30 side is formed.
  • the cover member 42 is formed so as to sandwich and hold the light guide rod 20 with the back side holding member 41.
  • the diffusion plate 12 and the optical sheet 13 are disposed on the front surface (upper surface) 42 a of the cover member 42.
  • the front surface 42a is an example of the “surface on the display panel side of the holding member” in the present invention.
  • the inner surface 42 b of the cover member 42 is formed on an inclined surface, and the light emitted from the light guide rod 20 and reaching the cover member 42 is diffused on the diffusion plate 12 side (liquid crystal It has a function of reflecting on the display panel 2 side.
  • the light emitting portion 22 of the light guide rod 20 is sandwiched (held) by a clip 60.
  • the clip 60 includes a pair of sandwiching portions 60 a that sandwich (hold) the light emitting portion 22 of the light guide rod 20, and an insertion portion 60 b that is attached to the attachment hole 50 a of the backlight chassis 50. Contains.
  • the light guide bar 20 is held at a predetermined position of the backlight device 10 by the clip 60 and the holding member 40 (see FIG. 10).
  • the light source 30 is directly below the liquid crystal display panel 2. Since it is not necessary to arrange
  • the plurality of light guide bars 20 are arranged at a predetermined interval from each other, thereby reducing the area of the plurality of light guide bars 20 from the area of the liquid crystal display panel 2. Therefore, the backlight device 10 can be reduced in weight. In addition, the cost of the backlight device 10 can be reduced.
  • the processed portion 22e is provided in the lower portion of the side surface 22d of the light guide bar 20, and is not provided in the upper portion of the side surface 22d of the light guide bar 20. For this reason, light can be emitted from the lower part of the side surface 22d of the light guide bar 20, and the optical path length until the light emitted from the light guide bar 20 reaches the diffusion plate 12 can be increased. . Thereby, since the light radiate
  • the distance from the light guide bar 20 to the diffusion plate 12 is set to be larger than the distance from the light guide bar 20 to the reflection sheet 11, thereby emitting from the light guide bar 20. Since the optical path length until the transmitted light reaches the diffusion plate 12 can be further increased, the light emitted from the light guide rod 20 can reach a wider range of the diffusion plate 12. Thereby, it can suppress more that the uniformity of illumination light falls.
  • the probability that the light from the light source 30 reaches the tip surface 22a is reduced.
  • the utilization efficiency of light can be improved.
  • luminance of the part of the liquid crystal display panel 2 in the vicinity of the front end surface 22a of the light guide rod 20 becomes high.
  • the luminance uniformity of the liquid crystal display panel 2 can be further improved by suppressing light from being emitted from the distal end surface 22a of the light guide bar 20.
  • the processed portion 22e is formed in a strip shape having a width substantially the same as the length of one side of the distal end surface 22a of the light guide rod 20, thereby forming the processed portion 22e.
  • the width can be made constant.
  • the light guide rod 20 is provided with the convex portion 21e
  • the holding member 40 is provided with the engagement concave portion 41b that engages with the convex portion 21e of the light guide rod 20. Since the light guide bar 20 can be positioned at a predetermined position of the holding member 40, the assembly workability of the backlight device 10 can be improved. Further, by providing the light guide rod 20 with the convex portion 21e, it is possible to suppress the passage of light passing through the light guide rod 20 from being hindered compared to the case where the light guide rod 20 is provided with the engagement concave portion. it can.
  • the light guide bar 20 contacts the light source 30 by providing the holding member 40 with the restricting portion 41 d that restricts the light guide bar 20 from moving toward the light source 30. Can be suppressed.
  • the light guide rod 20 can be prevented from moving in the A direction by the engaging recess 41b of the holding member 40. Thereby, since it can suppress that the light guide bar 20 moves to the light source 30 side, it can suppress that the light guide bar 20 contacts the light source 30 more.
  • the light guide rod 20 can be prevented from moving to the side opposite to the light source 30 by the engaging recess 41b. Thereby, since it can suppress that the distance between the light source 30 and the light guide rod 20 becomes large, it suppresses that the efficiency which the light radiate
  • the diffusion plate 12 and the optical sheet 13 are disposed on the front surface 42a of the holding member 40, so that a member for placing the diffusion plate 12 and the optical sheet 13 is separately provided. Compared to the case, it is possible to suppress an increase in the number of parts.
  • the light guide bar 120 includes a holding unit 121 held by the holding member 140 and a light emitting unit that emits light from the light source 30. 122.
  • the light guide bar 120 is formed so that light from the light source 30 is emitted mainly from the light guide bar 120 in an obliquely forward direction (obliquely upward direction).
  • the light guide bar 120 is formed so that the light guide bar 20 of the first embodiment is rotated by 45 degrees.
  • the holding part 121 has a dogleg shape when viewed from the side opposite to the light incident surface 121a (see FIGS. 17 and 18) on which the light emitted from the light source 30 is incident and the light incident surface 121a. And a pair of side surfaces 121b (see FIG. 19).
  • the side surface 121b includes a front side surface portion 121c and a rear side surface portion 121d arranged on the rear side (lower side) of the front side surface portion 121c.
  • the front side surface portion 121c and the rear side surface portion 121d are formed to be inclined by 45 degrees with respect to the C direction.
  • the front side surface portion 121c is an example of the “first side surface portion” in the present invention
  • the rear side surface portion 121d is an example of the “second side surface portion” in the present invention.
  • a convex portion 121e protruding downward is formed on the rear (lower) portion of the holding portion 121.
  • the convex portion 121e may have a substantially rectangular parallelepiped shape or other shape.
  • the light emission part 122 (light guide bar 120) is formed in the taper shape (taper shape).
  • the light emitting part 122 is formed in a dogleg shape when viewed from the tip surface 122a formed on the side opposite to the light incident surface 121a of the holding part 121 and the tip surface 122a side (the side opposite to the light incident surface 121a). And a pair of side surfaces 122b.
  • the side surface 122b includes a front side surface portion 122c and a rear side surface portion 122d arranged on the rear side (lower side) of the front side surface portion 122c.
  • the front side surface portion 122c is an example of the “first side surface portion” in the present invention
  • the rear side surface portion 122d is an example of the “second side surface portion” in the present invention.
  • the front side surface portion 122 c is formed so as to be inclined with respect to the front side surface portion 121 c of the holding portion 121, and as the distance from the light incident surface 121 a (see FIG. 18) increases. It is formed so as to approach the reflection sheet 11.
  • the rear side surface portion 122d is formed on the same plane as the rear side surface portion 121d of the holding portion 121.
  • the rear side surface portion 122d has a processing portion 122e for changing the traveling direction of light from the light source 30 to a direction suitable for external emission. Is formed. For this reason, as shown in FIG. 19, the light that has reached the rear side surface portion 122d is emitted in a diagonally forward direction mainly from the surface (front side surface portion 122c) disposed to face the rear side surface portion 122d.
  • the hatched areas in FIGS. 18 to 20 show the processed part 122e. Further, the region surrounded by the one-dot chain line in FIG. 19 shows the emission angle distribution of the light emitted from the light guide rod 120.
  • the processing part 122e is an example of the “light emitting processing part” in the present invention.
  • the processed portion 122 e has a lower part of the light guide bar 120 (below the center of the light guide bar 120 in the C direction). On the other hand, it is not formed on the upper part of the light guide bar 120 (the part above the center of the light guide bar 120 in the C direction). Further, the processed portion 122e is formed in a belt shape having a width that is substantially the same as the length of one side of the distal end surface 122a.
  • the light guide bar 120 is disposed so that the distance from the light guide bar 120 to the diffusion plate 12 is larger than the distance from the light guide bar 120 to the reflection sheet 11. .
  • the holding member 140 includes a lower holding member 141 disposed on the lower side of the holding portion 121 of the light guide bar 120 and a cover member 142 that covers the upper side of the holding portion 121.
  • concave portions 141a for holding the holding portion 121 of the light guide rod 120 are formed at a predetermined pitch in the B direction.
  • An engagement recess 141b that engages with the protrusion 121e of the light guide rod 120 is formed in the recess 141a.
  • the lower holding member 141 has an opening 141c so as to face the light incident surface 121a (see FIG. 18) of the light guide rod 120.
  • a restricting portion 141d that restricts the light guide rod 120 from moving to the light source 30 side is formed around the opening 141c.
  • the light guide bar 220 is formed in a substantially quadrangular prism shape.
  • the holding portion 221 of the light guide bar 220 includes a light incident surface 221 a on which light emitted from the light source 30 is incident, and light, as in the second embodiment. When viewed from the side opposite to the incident surface 221a, it includes a pair of U-shaped side surfaces 221b.
  • the side surface 221b includes a front side surface portion 221c and a rear side surface portion 221d disposed on the rear side (lower side) of the front side surface portion 221c, as in the second embodiment. Further, as shown in FIG. 22, a convex portion 221e that protrudes downward is formed on the rear (lower) portion of the holding portion 221.
  • the front side surface portion 221c is an example of the “display panel side portion” and the “first side surface portion” in the present invention.
  • the rear side surface portion 221d is an example of the “part on the side opposite to the display panel” and the “second side surface portion” of the present invention.
  • the light emitting portion 222 of the light guide rod 220 is viewed from the tip surface 222a formed on the side opposite to the light emitting surface 221a of the holding portion 221 and the tip surface 222a side (the side opposite to the light incident surface 221a). And a pair of side surfaces 222b having a U-shape.
  • the side surface 222b includes a front side surface portion 222c and a rear side surface portion 222d arranged on the rear side (lower side) of the front side surface portion 222c.
  • the front side surface portion 222c is an example of the “display panel side portion” and the “first side surface portion” in the present invention.
  • the rear side surface portion 222d is an example of the “part opposite to the display panel” and the “second side surface portion” of the present invention.
  • the front side surface portion 222 c is formed on the same plane as the front side surface portion 221 c of the holding portion 221, and is a surface (rear side surface portion) disposed opposite to the front side surface portion. 222d).
  • a processing portion 222e for changing the traveling direction of light from the light source 30 to a direction suitable for external emission is formed on the rear side surface portion 222d.
  • the light that has reached the rear side surface portion 222d is emitted in a diagonally forward direction mainly from the surface (front side surface portion 222c) disposed to face the rear side surface portion 222d.
  • the hatched areas in FIGS. 21 to 23 show the processed part 222e.
  • a region surrounded by a one-dot chain line in FIG. 23 indicates an emission angle distribution of light emitted from the light guide bar 220.
  • the processed portion 222e is an example of the “light emitting processed portion” in the present invention.
  • the processed portion 222 e is formed on the lower portion (rear side surface portion 222 d) of the light guide rod 220, while on the upper side of the light guide rod 220. It is not formed on the portion (front side surface portion 222c). That is, the processed portion 222e is formed in a portion below the center of the light guide bar 220 in the C direction, but is not formed in a portion above the center of the light guide bar 220 in the C direction.
  • the remaining structure of the third embodiment is the same as that of the second embodiment.
  • a processing portion 322e is formed on the upper side (liquid crystal display panel 2 side) of the light guide bar 320. The case will be described.
  • the light guide bar 320 includes a holding portion 321 and a light emitting portion 322 as shown in FIG.
  • the light guide bar 320 is formed as if the light guide bar 120 of the second embodiment is turned upside down.
  • the light guide bar 320 is formed so that the light from the light source 30 is emitted from the light guide bar 320 in an obliquely rearward direction (an obliquely downward direction).
  • the holding portion 321 has a dogleg shape when viewed from the side opposite to the light incident surface 321a (see FIGS. 24 and 25) on which light emitted from the light source 30 is incident and the light incident surface 321a. And a pair of side surfaces 321b (see FIG. 26).
  • the side surface 321b includes a front side surface portion 321c and a rear side surface portion 321d disposed on the rear side (lower side) of the front side surface portion 321c.
  • the front side surface portion 321c is an example of the “first side surface portion” in the present invention
  • the rear side surface portion 321d is an example of the “second side surface portion” in the present invention.
  • a convex portion 321e protruding downward is formed on the rear (lower) portion of the holding portion 321.
  • the light emission part 322 (light guide bar 320) is formed in the taper shape (taper shape).
  • the light emitting portion 322 includes a tip surface 322a formed on the side opposite to the light incident surface 321a of the holding portion 321 and a tip surface 322a side (the side opposite to the light incident surface 321a). ) And a pair of side surfaces 322b having a dogleg shape.
  • the side surface 322b includes a front side surface portion 322c and a rear side surface portion 322d disposed on the rear side (lower side) of the front side surface portion 322c.
  • the front side surface portion 322c is an example of the “first side surface portion” in the present invention
  • the rear side surface portion 322d is an example of the “second side surface portion” in the present invention.
  • the front side surface portion 322c is formed on the same plane as the front side surface portion 321c of the holding portion 321 as shown in FIGS.
  • the front side surface portion 322c has a processing portion 322e for changing the traveling direction of light from the light source 30 to a direction suitable for external emission. Is formed.
  • the light that has reached the front side surface portion 322c is mainly obliquely rearward (from the liquid crystal display panel 2 to the rear side surface portion 322d) opposed to the front side surface portion 322c. Is emitted toward the opposite side.
  • the hatched areas in FIGS. 24 to 27 show the processed portion 322e.
  • a region surrounded by a one-dot chain line in FIG. 26 indicates an emission angle distribution of light emitted from the light guide bar 320.
  • the processed portion 322e is an example of the “light emitting processed portion” in the present invention.
  • the processing portion 322e is provided on the upper part of the light guide bar 320 (from the center of the light guide bar 320 in the C direction). Is not formed in the lower part of the light guide bar 320 (the part below the center of the light guide bar 320 in the C direction).
  • the processed portion 322e is formed in a belt shape having a width that is approximately the same as the length of one side of the tip end surface 322a.
  • the rear side surface portion 322d is formed to be inclined with respect to the rear side surface portion 321d of the holding portion 321, and as the distance from the light incident surface 321a increases, the reflection sheet is formed. 11 is formed so as to be away from 11.
  • the distance from the light guide bar 320 to the diffusion plate 12 is the distance from the light guide bar 320 to the reflection sheet 11.
  • the light guide bar 320 is arranged so as to be smaller than that.
  • the remaining structure of the fourth embodiment is similar to that of the aforementioned second embodiment.
  • the processing portion 322e is provided in the upper part of the light guide bar 320, and is not provided in the lower part of the light guide bar 320, and the light from the light source 30 is guided.
  • the light is emitted from the light rod 320 in a diagonally downward direction.
  • the light emitted from the light guide bar 320 reaches the diffusion plate 12 after being reflected by the reflection sheet 11, so that the optical path length until the light emitted from the light guide bar 320 reaches the diffusion plate 12 is increased. can do.
  • emitted from the light-guide rod 320 can be easily made to reach the wide range of the diffusion plate 12, it can suppress that the uniformity of illumination light falls easily.
  • the distance from the light guide bar 320 to the diffusion plate 12 is made smaller than the distance from the light guide bar 320 to the reflection sheet 11 to emit from the light guide bar 320. It is possible to further increase the optical path length until the received light reaches the diffusion plate 12. Thereby, since the light radiate
  • the light guide bar 420 is formed in a substantially quadrangular prism shape.
  • the light guide bar 420 is formed as if the light guide bar 220 of the third embodiment is turned upside down.
  • the light guide bar 420 is formed such that light from the light source 30 is emitted from the light guide bar 420 in an obliquely rearward direction (an obliquely downward direction).
  • the holding portion 421 of the light guide bar 420 includes a light incident surface 421a on which light emitted from the light source 30 is incident, and light, as in the fourth embodiment.
  • a pair of U-shaped side surfaces 421b is included.
  • the side surface 421b includes a front side surface portion 421c and a rear side surface portion 421d disposed on the rear side (lower side) of the front side surface portion 421c, as in the fourth embodiment. Further, as shown in FIG. 29, a convex portion 421e protruding downward is formed on the rear (lower) portion of the holding portion 421.
  • the front side surface portion 421c is an example of the “display panel side portion” and the “first side surface portion” in the present invention.
  • the rear side surface portion 421d is an example of the “part on the side opposite to the display panel” and the “second side surface portion” of the present invention.
  • the light emitting portion 422 of the light guide rod 420 is seen from the tip surface 422a formed on the side opposite to the light emitting surface 421a of the holding portion 421 and the tip surface 422a side (the side opposite to the light incident surface 421a). And a pair of side surfaces 422b having a U-shape.
  • the side surface 422b includes a front side surface portion 422c and a rear side surface portion 422d disposed on the rear side (lower side) of the front side surface portion 422c.
  • the front side surface portion 422c is an example of the “display panel side portion” and the “first side surface portion” in the present invention.
  • the rear side surface portion 422d is an example of the “part opposite to the display panel” and the “second side surface portion” of the present invention.
  • the front side surface portion 422 c is formed on the same plane as the front side surface portion 421 c of the holding portion 421, and is a surface (rear side surface portion) disposed opposite to it. 422d).
  • a processed portion 422e for changing the traveling direction of light from the light source 30 to a direction suitable for external emission is formed on the front side surface portion 422c. Therefore, as shown in FIG. 30, the light that has reached the front side surface portion 422c is obliquely rearward (from the liquid crystal display panel 2 with respect to the surface (rear side surface portion 422d) opposed to the front side surface portion 422c. Is emitted toward the opposite side.
  • the hatched areas in FIGS. 28 to 30 show the processed part 422e.
  • a region surrounded by a one-dot chain line in FIG. 30 indicates an emission angle distribution of light emitted from the light guide bar 420.
  • the processed portion 422e is an example of the “light emitting processed portion” in the present invention.
  • the processed portion 422e is formed on the upper portion (front side surface portion 422c) of the light guide bar 420, while the lower portion of the light guide bar 420 is formed. It is not formed on the portion (rear side surface portion 422d).
  • the processed portion 422e is formed in a portion above the center of the light guide rod 420 in the C direction, but is not formed in a portion below the center of the light guide rod 420 in the C direction.
  • the remaining structure of the fifth embodiment is the same as that of the third and fourth embodiments.
  • the effect of the fifth embodiment is the same as that of the first to fourth embodiments.
  • adjacent light guide bars 520 are connected by a connecting portion 523.
  • the connecting portion 523 is formed so as to extend in a direction (B direction) orthogonal to (intersect) the direction in which the light guide bar 520 extends.
  • connecting portion 523 may be formed to have a smaller cross-sectional area than the light guide bar 520. Further, for example, one connecting portion 523 is provided between adjacent light guide bars 520.
  • the plurality of light guide bars 520 and the connecting portion 523 are formed of a translucent resin or the like, and are integrally formed by, for example, injection molding using a molding die.
  • the three light guide bars 520 are connected by the connecting part 523, but two or four or more light guide bars 520 may be connected by the connecting part 523. Further, all the light guide bars 520 included in the backlight device may be connected by the connecting portion 523.
  • one of the plurality of light guide bars 520 is sandwiched (held) by the clip 60.
  • the other structure of the sixth embodiment is the same as that of the first to fifth embodiments.
  • the plurality of light guide bars 520 are connected by the connecting portion 523, thereby reducing the number of parts compared to the case where the plurality of light guide bars 520 are formed separately. can do. Further, since the plurality of light guide bars 520 and the plurality of light sources 30 can be aligned simultaneously by connecting the plurality of light guide bars 520 with the connecting portion 523, the assembly workability of the backlight device is improved. Can be made.
  • the connecting portion 523 is clamped (held) by a clip 660, unlike the sixth embodiment. Further, for example, one of the plurality of connecting portions 523 is sandwiched (held) by the clip 660.
  • connecting portion 523 is provided on a portion of the light guide bar 520 opposite to the light source 30.
  • the other structure of the seventh embodiment is the same as that of the first to sixth embodiments.
  • the connecting portion 523 is held by the clip 660 as described above.
  • the light is not blocked by the clip 60 from being emitted from the light guide bar 520, and therefore the case where the light guide bar 520 is held by the clip 60.
  • the uniformity of illumination light can be improved.
  • a part of the light passing through the light guide rod 520 travels between the adjacent light guide rods 520 via the connecting portion 523.
  • the light guide bar 520 and the connection part 523 are held by the clips 60 and 660, a part of the light passing through the light guide bar 520 and the connection part 523 is part of the light guide bar 520 and the clip 60 of the connection part 523.
  • the light is emitted to the outside from the portion in contact with 660 and absorbed by clips 60 and 660.
  • the amount of light passing through the connecting portion 523 is less than that of light passing through the light guide bar 520.
  • the amount of light absorbed by the clip 660 is reduced by holding the connecting portion 523 by the clip 660 as compared to the case where the light guide bar 520 is held by the clip 60. be able to. Thereby, the loss of light can be reduced.
  • adjacent light guide rods 720 are connected by a connecting portion 723. Further, at least one of the connecting portions 723 is formed with a protruding portion 724 extending in a direction orthogonal (crossing) to the extending direction of the connecting portion 723.
  • the plurality of light guide rods 720, the connecting portion 723, and the protruding portion 724 are formed of a light-transmitting resin or the like, and are integrally formed by, for example, injection molding using a molding die.
  • the protrusion 724 is formed to extend in parallel with the direction in which the light guide bar 720 extends (direction A).
  • the protruding portion 724 is sandwiched (held) by the clip 760.
  • the protrusion part 724 may protrude from the connection part 723 to the light source 30 side as shown in FIG. 33, or may protrude from the connection part 723 to the side opposite to the light source 30.
  • the protruding portion 724 is provided in the connecting portion 723, and the protruding portion 724 is held by the clip 760.
  • the protruding portion 724 is provided in the connecting portion 723, a part of the light passing through the connecting portion 723 enters the protruding portion 724. Since light entering the projecting portion 724 is less than light passing through the connecting portion 723, the projecting portion 724 is held by the clip 760, so that the connecting portion 523 is held by the clip 660. The amount of light absorbed by the clip 760 can be reduced. Thereby, the loss of light can be further reduced.
  • the protrusion 724 is formed so as to extend in parallel with the direction in which the light guide bar 720 extends, so that the protrusion 724 is parallel to the direction in which the light guide bar 720 extends.
  • the clip 760 can be moved (slid). Thereby, when the light guide bar 720 expands and contracts due to heat, the light guide bar 720 can be prevented from being deformed (for example, the light guide bar 720 is bent).
  • the said embodiment demonstrated the example which has arrange
  • this invention is not limited to this,
  • Two light guide bars 820 may be arranged along the A direction as in the apparatus. That is, the light source 30 and the mounting substrate 31 may be arranged in both the A directions. If comprised in this way, since the light source 30 which is a heat source can be arrange
  • the said embodiment demonstrated the example which has arrange
  • this invention is not limited to this,
  • a plurality (three or more) of light guide bars 920 may be arranged along the short side direction (A direction) of the liquid crystal display panel. If comprised in this way, the light source 30 can be intermittently lighted sequentially in the A direction in synchronization with scanning of a general liquid crystal display panel, and the moving image display performance of the liquid crystal display device can be improved.
  • the present invention is not limited to this, and for example, as shown in FIG.
  • a plurality of connecting portions 1023 may be provided between adjacent light guide bars 1020.
  • the present invention is not limited to this, and the light guide rod and the connecting portion are not integrally formed. May be.
  • the present invention is not limited thereto, and the light guide rod may not be provided with the holding portion. Further, the holding member may not be provided.
  • control part and the engagement recessed part in the holding member was demonstrated in the said embodiment, this invention is not restricted to this, It is not necessary to provide a control part and an engagement recessed part in a holding member. However, only one of the restricting portion and the engaging recess may be provided. Even when only one of the restricting portion and the engaging recess is provided on the holding member, it is possible to prevent the light guide bar from contacting the light source.
  • the light guide part of a light guide rod is formed in shapes other than a rectangular parallelepiped. Also good.
  • the present invention is not limited to this, and the light source is configured to include two or four or more light emitting elements. May be.
  • Liquid crystal display device 2 Liquid crystal display panel (display panel) 10, 110, 210, 310, 410 Backlight device 11 Reflective sheet (reflective member) 12 Diffuser (Optical member) 13 Optical sheet (optical member) 20, 120, 220, 320, 420, 520, 720, 820, 920, 1020 421b, 422b Side surface 21e, 121e, 221e, 321e, 421e Convex part 22a, 122a, 222a, 322a, 422a Tip surface 22e, 122e, 222e, 322e, 422e Processing part (outgoing processing part) 30 Light source 40, 140 Holding member 41b, 141b Engaging recess 41d, 141d Restricting part 42a Front surface (surface of holding member on display panel side) 60, 660, 760 Clip 121c, 122c, 321c, 322c Front side surface (first side surface) 121d, 122d, 3

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Abstract

L'invention concerne un dispositif de rétroéclairage qui produit une lumière d'éclairage uniforme et qui est léger. Ce dispositif de rétroéclairage (10) comporte des barres de guidage de lumière (20) servant à guider la lumière émise depuis des sources de lumière (30). Les barres de guidage de lumière sont agencées en laissant entre elles des intervalles déterminés. Les barres de guidage de lumière (20) comportent chacune des sections travaillées (22e) situées sur leurs surfaces latérales (22d) et changeant la direction d'avancement de la lumière, qui est émise depuis les sources de lumière vers des directions qui conviennent pour l'émission de la lumière vers l'extérieur. Les parties de chacune des barres de guidage de lumière qui sont situées du côté opposé à un panneau d'affichage à cristaux liquides (2) comportent les sections travaillées, et leurs parties qui sont situées du côté du panneau d'affichage à cristaux liquides ne comportent pas les sections travaillées.
PCT/JP2011/060387 2010-06-29 2011-04-28 Dispositif de rétroéclairage et dispositif d'affichage Ceased WO2012002034A1 (fr)

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JP2010-147096 2010-06-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019067701A (ja) * 2017-10-04 2019-04-25 シャープ株式会社 発光装置及び液晶表示装置
CN110673392A (zh) * 2019-09-17 2020-01-10 昆山龙腾光电股份有限公司 背光源组件及背光模组

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04172401A (ja) * 1990-11-06 1992-06-19 T T T:Kk 表示装置
JPH11144514A (ja) * 1997-11-07 1999-05-28 Sharp Corp 照明装置および液晶表示装置
JP2001092370A (ja) * 1999-09-21 2001-04-06 Matsushita Electric Ind Co Ltd 照明装置とそれを用いた表示装置および表示装置の駆動方法と液晶表示パネル
JP2008218223A (ja) * 2007-03-05 2008-09-18 Takiron Co Ltd 面発色装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04172401A (ja) * 1990-11-06 1992-06-19 T T T:Kk 表示装置
JPH11144514A (ja) * 1997-11-07 1999-05-28 Sharp Corp 照明装置および液晶表示装置
JP2001092370A (ja) * 1999-09-21 2001-04-06 Matsushita Electric Ind Co Ltd 照明装置とそれを用いた表示装置および表示装置の駆動方法と液晶表示パネル
JP2008218223A (ja) * 2007-03-05 2008-09-18 Takiron Co Ltd 面発色装置

Cited By (5)

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JP2019067701A (ja) * 2017-10-04 2019-04-25 シャープ株式会社 発光装置及び液晶表示装置
CN109828409A (zh) * 2017-10-04 2019-05-31 夏普株式会社 发光装置及液晶显示装置
JP7000105B2 (ja) 2017-10-04 2022-02-04 シャープ株式会社 発光装置及び液晶表示装置
CN110673392A (zh) * 2019-09-17 2020-01-10 昆山龙腾光电股份有限公司 背光源组件及背光模组
CN110673392B (zh) * 2019-09-17 2022-12-20 昆山龙腾光电股份有限公司 背光源组件及背光模组

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