WO2012063917A1 - Illumination device and liquid crystal display device provided with same - Google Patents

Illumination device and liquid crystal display device provided with same Download PDF

Info

Publication number
WO2012063917A1
WO2012063917A1 PCT/JP2011/075989 JP2011075989W WO2012063917A1 WO 2012063917 A1 WO2012063917 A1 WO 2012063917A1 JP 2011075989 W JP2011075989 W JP 2011075989W WO 2012063917 A1 WO2012063917 A1 WO 2012063917A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
light
chassis
frame
Prior art date
Application number
PCT/JP2011/075989
Other languages
French (fr)
Japanese (ja)
Inventor
弘樹 深井
小倉　健
茂賀 岡崎
東　洋喜
一喜 中道
祐輔 三宅
沙織 南保
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012063917A1 publication Critical patent/WO2012063917A1/en

Links

Images

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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • G02B6/0085—Means for removing heat created by the light source from 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
    • G02B6/0081—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

Definitions

  • the present invention relates to an illumination device disposed on the back surface of a liquid crystal display panel and a liquid crystal display device including the illumination device.
  • a general liquid crystal display device includes a liquid crystal display panel and a lighting device disposed on the back side of the liquid crystal display panel so as to irradiate light.
  • a sidelight including a plate-like light guide plate made of a transparent material such as acrylic resin and a light source made up of LEDs (light emitting diodes) arranged along one side or a plurality of sides of the light guide plate
  • LEDs light emitting diodes
  • a type (edge light type) is known.
  • Such a sidelight type illuminating device has advantages such as being easily reduced in thickness as compared to a direct illuminating device in which a light source is disposed on the back surface of a liquid crystal display panel.
  • FIGS. 4 and 5 are an exploded perspective view and a cross-sectional view of the main part showing a schematic configuration of a liquid crystal display device including a sidelight type illumination device using such an LED.
  • the liquid crystal display device 100 includes a bezel 102, a liquid crystal display panel 103, and a lighting device 104.
  • the bezel 102 has a frame shape that covers the periphery of the liquid crystal display panel 103, and ensures the strength of the entire liquid crystal display device 100 together with the chassis 114.
  • the liquid crystal display panel 103 is formed by bonding two pieces of glass and sealing the liquid crystal therebetween, so that an image can be displayed on the front surface.
  • the illuminating device 104 includes a chassis 114 having a shallow box shape. Inside the chassis 114, optical sheets 107 to 109, a light guide plate 111, a first reflecting sheet 110, and a plurality of LEDs 121 are mounted.
  • the LED board 120 can be stored.
  • the light guide plate 111 includes a light incident surface 111 a for introducing light from the LEDs 121 included in the LED substrate 120, and the light introduced from the light incident surface 111 a upward (irradiation direction). And a light emitting surface 111b for emitting the light.
  • the light incident surface 111 a is configured by a predetermined side end surface of the light guide plate 111
  • the light emitting surface 111 b is configured by the front surface of the light guide plate 111.
  • the first reflection sheet 110 is disposed so as to cover the back surface 111c of the light guide plate 111 opposite to the light emitting surface 111b.
  • the optical sheets 107 to 109 include a diffusion sheet, a lens sheet, and the like, and are disposed on the light emitting surface 111b of the light guide plate 111.
  • the optical sheets 107 to 109, the light guide plate 111, and the first reflection sheet 110 are fixed in a stacked state on the bottom plate portion 114a of the chassis 114 by the frame 105.
  • the plurality of LEDs 121 provided on the LED substrate 120 are arranged in the vicinity of the light incident surface 111 a of the light guide plate 111. Further, the light emitting surface 121a of the LED 121 is arranged at a predetermined interval along the light incident surface 111a so as to face the light incident surface 111a of the light guide plate 111.
  • the LED board 120 is erected vertically with respect to the bottom plate portion 114a by a support member (L-shaped mounting (mounting) mounting bracket) 115 provided on the bottom plate portion 114a in the vicinity of the side wall portion 114b of the chassis 114. Is held to be.
  • the bottom plate portion 114a of the chassis 114 is provided with a convex portion 114d protruding downward, and the support member 115 is fixed to the convex portion 114d.
  • a band-shaped second reflection sheet 116 having an adhesive layer on one side is adhered (attached) to the upper surface of the convex portion 114d.
  • the second reflection sheet 116 is disposed so as to fill a gap between the first reflection sheet 110 and the LED 121, and is configured to reflect light from the LED 121.
  • a strip-shaped third reflection sheet 117 having an adhesive layer on one side is bonded (attached) to the lower surface 105c of the frame 105.
  • the third reflection sheet 117 has a function of reflecting light from the LED 121 and is in contact with the upper surface of the end portion of the light guide plate 111 to hold the light guide plate 111 with the bottom plate portion 114 a of the chassis 114. It also has a function as a part.
  • the following patent document is mentioned as a prior art document relevant to this invention.
  • thermal contraction occurs due to thermal expansion of a member formed by the temperature increase due to the lighting of the LED 121, or temperature decrease due to the LED 121 being turned off.
  • thermal expansion and contraction due to differences in linear expansion coefficients and volumes between the light guide plate 111 and the frame 105, the third reflection sheet 117 provided on the lower surface 105c of the frame 105, and the third
  • rubbing occurs with the light guide plate 111 against which the reflection sheet 117 is abutted, and this generates an abnormal sound (smearing sound) N such as “pick” as shown in FIG. .
  • An object of the present invention is to provide an illumination device that suppresses the generation of abnormal noise due to friction with a reflection sheet provided on the lower surface of a frame, and a liquid crystal display device including the same.
  • a lighting device includes a chassis having a box shape with an upper surface opened, a light guide plate having a plate shape accommodated in the chassis, and an outer peripheral end portion of the light guide plate.
  • a frame having a frame shape extending on the upper side of the chassis, and a light source for irradiating light to a predetermined side end surface of the light guide plate.
  • a reflection sheet having a function as a pressing portion for sandwiching the light plate between the chassis and a function of reflecting light is adhered, and a low surface is provided between the lower surface of the reflection sheet and the light guide plate.
  • the gist is that a friction member is interposed.
  • a low-friction member is bonded between the lower surface of the reflection sheet and the light guide plate, which is bonded to the lower surface of the frame and holds the light guide plate with the chassis. Therefore, even if members with different linear expansion coefficients are used in the light guide plate and the frame, they slide smoothly with each other due to the low friction member. Even if the thermal shrinkage caused by the temperature drop due to the occurrence of the noise, the generation of abnormal noise (stagnation sound) caused by friction between the light guide plate and the reflection sheet is suppressed.
  • the low friction member is preferably a transparent sheet adhered to the lower surface of the reflective sheet.
  • a transparent sheet having an adhesive layer on one side is adhered to the lower surface of the reflective sheet adhered to the lower surface of the frame, and the frame is attached to the chassis in which the light guide plate is accommodated.
  • the low friction member is preferably a transparent resin film coated on the lower surface of the reflective sheet. According to such a configuration, by simply attaching the reflection sheet whose lower surface is coated with a transparent resin film to the lower surface of the frame, and mounting the frame to the chassis containing the light guide plate, A transparent resin film (low friction member) can be easily interposed between the lower surface of the reflection sheet and the light guide plate. Moreover, since it is a transparent resin film, it is prevented that the light reflection characteristic of the lower surface of a reflection sheet is affected.
  • the low friction member is made of a lubricating grease applied to the lower surface of the reflection sheet.
  • the lubricating grease is applied to the lower surface of the reflection sheet bonded to the lower surface of the frame, and the frame is simply attached to the chassis containing the light guide plate.
  • Lubricating grease (low friction member) can be interposed between the lower surface of the reflection sheet and the light guide plate.
  • the lubricating grease may be white.
  • the liquid crystal display device which concerns on this invention makes it a summary to provide such an illuminating device and the liquid crystal display panel which performs a display using the light from the illuminating device. Is. According to such a liquid crystal display device, since the generation of abnormal noise is suppressed during or after use of the illumination device, the quality of the liquid crystal display device can be improved.
  • the low friction member is interposed between the light guide plate and the reflection sheet of the frame in contact with the light guide plate, it is possible to suppress the generation of noise due to friction between the two.
  • FIG. 1 is an exploded perspective view schematically showing a schematic configuration of a liquid crystal display device according to an embodiment of the present invention. It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG. (A) is the figure which showed the state which affixes a transparent sheet to the reflection sheet provided in the lower surface of the flame
  • FIG. 1 is an exploded perspective view schematically showing a liquid crystal display device according to this embodiment.
  • the liquid crystal display device 1 includes a liquid crystal display panel 3 and an illumination device (backlight device) 4 for irradiating the liquid crystal display panel 3 with light, and these are integrally held by a bezel 2 or the like. It has become.
  • the bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with the chassis 14 included in the illumination device 4.
  • the liquid crystal display panel 3 has a horizontally long rectangular shape when viewed from above.
  • a pair of glass substrates comprising a thin film transistor (TFT) array substrate and a color filter (CF) substrate are bonded together in parallel at a predetermined interval, and a liquid crystal is sandwiched between the glass substrates. It has a sealed configuration.
  • TFT thin film transistor
  • CF color filter
  • a plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate, and a plurality of colored patterns are formed in a matrix on the CF substrate, and a common electrode is formed on almost the entire surface.
  • An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the first electrode and the common electrode.
  • a polarizing plate is disposed on each of the front and back surfaces of the liquid crystal display panel 3.
  • the illumination device 4 is a so-called side light type (edge light type) illumination device.
  • the illumination device 4 includes a substantially box-shaped chassis 14 having an opening opened toward the liquid crystal display panel 3 side, and optical sheets 7 to 9 arranged so as to cover the opening of the chassis 14. Is provided. Further, inside the chassis 14, an LED substrate 20 on which a plurality of LEDs (light emitting diodes) 21 that are light sources are mounted, a light guide plate 11 that guides light from the LEDs 21 to the liquid crystal display panel 3 side, and the light guide plate 11.
  • arranged to the back side is provided.
  • the frame 5 is for fixing the optical sheets 7 to 9, the light guide plate 11, and the first reflection sheet 10 to the chassis 14 in a state where they are laminated in this order from above.
  • the frame 5 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 11, and the outer peripheral end portions of the optical sheets 7 to 9 and the light guide plate 11 extend over substantially the entire circumference. It can be pressed from the front side.
  • the frame 5 is, for example, a black metal member or a black synthetic resin member, and has a light shielding property. Further, the frame 5 can receive the back surface of the outer peripheral end portion of the liquid crystal display panel 3 with a concave surface 5b formed inside the upper surface of the frame portion 5a.
  • the chassis 14 is formed into a shallow box shape by bending a metal plate made of aluminum or the like, and the optical sheets 7 to 9, the light guide plate 11, the first reflection sheet 10, and the support member 15 are formed therein. And the LED board 20 can be accommodated.
  • the chassis 14 includes a bottom plate portion 14a having a horizontally long rectangular shape when viewed from above and a side plate portion 14b rising from the outer edges of the four sides of the bottom plate portion 14a. Further, the above-described frame 5 and bezel 2 can be fixed to the side plate portion 14b by screws or the like.
  • the three optical sheets 7 to 9 are composed of thin resin sheets having a horizontally long rectangular shape when seen in a plan view.
  • the optical sheets 7 to 9 are placed on the front side (light emitting side) of the light guide plate 11 and are interposed between the liquid crystal display panel 3 and the light guide plate 11.
  • a polarization selective reflection sheet 7, a lens sheet 8 and a diffusion sheet 9 having a thickness of about 0.1 to 0.5 mm are used in order from the top.
  • the diffusion sheet 9 is for making the luminance distribution uniform by diffusing the light emitted from the light guide plate 11.
  • the lens sheet 8 is for increasing the front luminance by condensing the light emitted from the diffusion sheet 9.
  • the polarization selective reflection sheet 7 is for selectively reflecting the light emitted from the lens sheet 8 so that the light is not absorbed by a polarizing plate (not shown) attached to the back surface of the liquid crystal display panel 3.
  • the light guide plate 11 is formed of a transparent resin plate having a horizontally long rectangular shape in a plan view and having a thickness of about 3 to 4 mm, for example.
  • the light guide plate 11 has a light incident surface 11a for introducing light from the LED 21 and a light emission surface 11b for emitting light introduced from the light incident surface 11a upward (irradiation direction). ing.
  • the light incident surface 11 a is configured by a predetermined side end surface of the light guide plate 11, and the light emitting surface 11 b is configured by the front surface of the light guide plate 11.
  • the light guide plate 11 reflects light incident from the light incident surface 11a repeatedly between the light emitting surface (front surface) 11b and the back surface 11c opposite to the light emitting surface 11b, and forms a planar shape inside the light guiding plate 11 It can be expanded.
  • a plurality of scattering portions are formed on the back surface 11c of the light guide plate 11 to scatter light incident from the light incident surface 11a and emit the light from the light emitting surface 11b.
  • a scattering part what was formed by printing the coating material containing a white pigment etc. on the back surface 11c of the light-guide plate 11 in the shape of a spot is applied.
  • the first reflection sheet 10 is disposed so as to cover the back surface 11c of the light guide plate 11 opposite to the light emitting surface 11b.
  • the first reflection sheet 10 is laid on the bottom plate portion 14a of the chassis 14.
  • the first reflecting sheet 10 is for reflecting light emitted from the back surface 11c of the light guide plate 11 to the back side toward the light guide plate 11, and is made of a resin having a thickness of about 0.1 to 2 mm, for example. Consists of sheets.
  • the front surface of the reflection sheet 10 is white, and the light emitted from the back surface 11c of the light guide plate 11 is efficiently reflected to the light guide plate 11 side so that the light utilization efficiency and the light emission surface of the light guide plate 11 are improved.
  • the brightness at 11b is increased.
  • the illumination device 4 can convert the light from the LED 21 into the planar light by the optical sheets 7 to 9, the light guide plate 11, and the first reflection sheet 10 and irradiate the back side of the liquid crystal display panel 3. It has become.
  • a power supply board 18 that supplies power to the LED board 20 and a control board 19 that drives the liquid crystal display panel 3 are disposed on the rear surface of the chassis 4.
  • the plurality of LEDs 21 provided on the LED substrate 20 are disposed in the vicinity of the light incident surface 11 a of the light guide plate 11.
  • the LED 21 has a package structure in which, for example, an LED chip that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and white light can be emitted from the light emitting surface 21a of the LED 21. Yes.
  • Such LEDs 21 are arranged at a predetermined interval along the light incident surface 11 a so that the light emitting surface 21 a faces the light incident surface 11 a of the light guide plate 11.
  • the LED substrate 20 includes a base material 22 made of metal such as aluminum.
  • This base material 22 (LED substrate 20) has a horizontally long belt shape.
  • an insulating layer 23 is formed on the front surface of the base material 22, and a plurality of LEDs 21, 21, 21,... Are aligned on the insulating layer 23 along the longitudinal direction thereof. Has been implemented.
  • the plurality of LEDs 21 are connected in series by a wiring pattern (not shown) formed on the insulating layer 23.
  • the base material 22 of the LED substrate 20 has a function of suppressing a temperature rise due to heat generation of the LED 21.
  • a heat conduction sheet (not shown) is interposed between the base material 22 and the support member 15, and the heat generated by the LED 21 is transmitted to the bottom plate of the chassis 14 via the base material 22, the heat conduction sheet and the support member 15. By conducting heat to the portion 14a (convex portion 14d), the temperature of the LED 21 is suppressed so as not to rise excessively.
  • the LED board 20 is attached in a standing state (standing state) on the support member 15 disposed on the bottom plate portion 14a in the vicinity of the side plate portion 14b of the chassis 14.
  • the support member 15 has a shape like a so-called bracket (an L-shaped mounting (fixing) fitting).
  • bracket an L-shaped mounting (fixing) fitting
  • the bottom plate portion 14a of the chassis 14 is provided with a convex portion 14d protruding downward, and the support member 115 is fixed to the convex portion 14d.
  • a belt-like second reflection sheet 16 having an adhesive layer on one side is adhered (attached) to the upper surface of the convex portion 14d.
  • the upper surface of the second reflective sheet 16 is white, and as shown in FIG. 2, the second reflective sheet 16 is arranged so as to fill a gap between the first reflective sheet 10 and the LED 21 and reflects light from the LED 21. Is configured to do.
  • a strip-shaped third reflection sheet 17 having an adhesive layer on one side is adhered (attached) to the lower surface 5 c of the frame 5.
  • the third reflection sheet 17 has a white lower surface, has a function of reflecting light from the LED 21, abuts against the upper surface of the end of the light guide plate 11, and makes the light guide plate 11 a bottom plate of the chassis 14. It also has a function as a pressing part that is sandwiched between the part 114a.
  • a low friction member 31 is provided on the lower surface (front surface) of the third reflection sheet 17 so as to cover the lower surface.
  • the low friction member 31 is interposed between the lower surface of the third reflection sheet 17 serving as a pressing portion of the frame 5 that sandwiches the light guide plate 11 with the chassis 14 and the upper end surface of the light guide plate 11. Due to the interposed configuration, even if members having different linear expansion coefficients are used in the light guide plate 11 and the frame 5, they slide smoothly with each other by the low friction member 31. Even if thermal contraction caused by thermal expansion caused by the LED 21 or temperature drop due to the turn-off of the LED 21 occurs, generation of abnormal noise (stagnation sound) caused by friction between the light guide plate 11 and the reflection sheet 17 is suppressed.
  • a transparent sheet 31 ⁇ / b> A is used as the low friction member 31.
  • This transparent sheet 31A is a resin sheet having a smooth surface (lower surface), and has an adhesive layer on the back surface (upper surface).
  • a sheet-like or tape-like one made of PET, fluororesin, Teflon (registered trademark), or the like can be exemplified.
  • a transparent sheet 31A having an adhesive layer on one side is bonded to the lower surface of the third reflection sheet 17 bonded to the lower surface 5c of the frame 5, and the frame 5 is connected to the light guide plate.
  • the transparent sheet 31 ⁇ / b> A (low friction member 31) can be easily interposed between the lower surface of the third reflection sheet 17 and the upper surface of the end portion of the light guide plate 11 simply by being attached to the chassis 14 in which 11 is accommodated. it can.
  • the transparent sheet 31A is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the third reflection sheet 17 from being affected. Note that the surface (lower surface) of the low-friction member 31A described above, that is, the contact surface with the upper surface of the end portion of the light guide plate 11 only needs to slide well with the light guide plate 11, and is not necessarily smooth.
  • a transparent resin film 31 ⁇ / b> B coated on the surface (lower surface) of the third reflection sheet 17 is used as the low friction member 31.
  • the transparent resin film 31B include a polyethylene film.
  • a third reflection sheet 17 having a lower surface coated with a transparent resin film 31B is adhered to the lower surface 5c of the frame 5, and the frame 5 is a chassis in which the light guide plate 11 is accommodated.
  • the transparent resin film 31B (low friction member 31) can be interposed between the lower surface of the third reflection sheet 17 and the upper surface of the end portion of the light guide plate 11 simply.
  • the transparent resin film 31B is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the third reflection sheet 17 from being affected.
  • the surface (lower surface) of the low friction member 31B described above that is, the contact surface with the upper surface of the end portion of the light guide plate 11 only needs to slide well with the light guide plate 11 and is not necessarily smooth.
  • lubricating grease 31 ⁇ / b> C is used as the low friction member 31.
  • examples of the lubricating grease 31C include silicon grease.
  • transparent lubricating grease 31C is applied to the lower surface of the third reflecting sheet 17 adhered to the lower surface 5c of the frame 5, and the light guide plate 11 accommodates the frame 5.
  • the lubricating grease 31 ⁇ / b> C (low friction member 31) can be easily interposed between the lower surface of the third reflection sheet 17 and the upper surface of the end portion of the light guide plate 11 simply by being mounted on the chassis 14. .
  • the lubricating grease 31C when the lubricating grease 31C is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the reflection sheet from being affected.
  • the lubricating grease 31C may be white grease.
  • the light guide plate 11 is bonded to the lower surface 5 c of the frame 5 and between the lower surface of the third reflection sheet 17 and the light guide plate 11 as a pressing portion that holds the light guide plate 11 between the chassis 14. Since the low friction member 31 (31A to 31C) is interposed between the light guide plate 11 and the frame 5, even if members having different linear expansion coefficients are used, the low friction member 31 (31A to 31C) Even if thermal expansion caused by the temperature rise due to the lighting of the LED 21 or the heat shrink caused by the temperature drop due to the turning off of the LED 21 occurs because of sliding smoothly, the friction between the light guide plate 11 and the third reflection sheet 17 Occurrence of an abnormal noise (stagnation sound) is suppressed. Therefore, since the generation of abnormal noise is suppressed during or after use of the lighting device 4 in this way, the quality of the lighting device 4 and the liquid crystal display device 1 can be improved.
  • the present invention is not limited to these embodiments, and can be variously modified without departing from the gist of the present invention. Of course, it can be implemented.
  • the LED substrate 20 (light source) is disposed so as to face one long side of the light guide plate 11 having a rectangular shape, and one long side of the frame 5 corresponding to this.
  • the configuration in which the third reflection sheet 17 and the low friction member 31 are provided on the lower surface 5c of the frame portion 5a has been described.
  • the LED substrate 20 (light source) is disposed so as to face each of the pair of opposed long sides of the light guide plate 11, and the lower surfaces of the pair of frame portions 5a of the opposed long sides of the frame 5 corresponding thereto. You may make it the structure which provided the 3rd reflective sheet 17 and the low friction member 31 in 5c.
  • the LED substrate 20 (light source) is disposed so as to face one long side and one short side of the light guide plate 11, respectively, and the frame portion 5a on one long side of the frame 5 corresponding to this.
  • the third reflection sheet 17 and the low-friction member 31 may be provided on the lower surface 5c and the lower surface 5c of the frame 5a on one short side, respectively, and are not limited to the above-described embodiment.

Abstract

The purpose of the present invention is to provide an illumination device that suppresses the generation of noise caused by friction between a light guide plate and a reflective sheet disposed on the bottom surface of a frame, caused by heat generated by a light source.　The illumination device (4) comprises: a plate-shaped light guide plate (11); a box-shaped chassis (14) that houses the light guide plate (11) and with the upper surface thereof open; a frame-shaped frame (5) that extends along the outer circumferential end section of the light guide plate (11) and is mounted to the upper side of the chassis (14); and a light source (21) for irradiating light on to a prescribed side end surface of the light guide plate (11). The reflective sheet (17), with a function as a pressing section that sandwiches the light guide plate (11) between said reflective sheet (17) and the chassis (14) and a light-reflecting function, is bonded to the bottom surface (5c) of the frame (5); and a low-friction member (31) is interposed between a lower side surface of said reflective sheet (17) and the light guide plate (11).

Description

照明装置およびこれを備えた液晶表示装置LIGHTING DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME
　本発明は、液晶表示パネルの背面に配設される照明装置およびその照明装置を備えた液晶表示装置に関する。 The present invention relates to an illumination device disposed on the back surface of a liquid crystal display panel and a liquid crystal display device including the illumination device.
　近年、コンピュータやテレビなどの家電製品の表示部として、液晶表示装置が広く用いられている。一般的な液晶表示装置は、液晶表示パネルと、その液晶表示パネルに光を照射するようにその背面側に配設される照明装置を備えている。この種の照明装置としては、アクリル樹脂などの透明材料からなる板状の導光板と、この導光板の一辺または複数の辺に沿って配置されるＬＥＤ（発光ダイオード）からなる光源を備えるサイドライト型（エッジライト型）のものが知られている。このようなサイドライト型の照明装置（バックライト装置）は、光源が液晶表示パネルの背面に配設される直下型の照明装置と比べて、薄型化し易い等の利点を有している。 In recent years, liquid crystal display devices have been widely used as display units for home appliances such as computers and televisions. A general liquid crystal display device includes a liquid crystal display panel and a lighting device disposed on the back side of the liquid crystal display panel so as to irradiate light. As this type of lighting device, a sidelight including a plate-like light guide plate made of a transparent material such as acrylic resin and a light source made up of LEDs (light emitting diodes) arranged along one side or a plurality of sides of the light guide plate A type (edge light type) is known. Such a sidelight type illuminating device (backlight device) has advantages such as being easily reduced in thickness as compared to a direct illuminating device in which a light source is disposed on the back surface of a liquid crystal display panel.
　特に、このようなサイドライト型の照明装置の光源としてＬＥＤを用いたものは、長寿命、高発光効率の利点を有しているため、特に注目されている。図４および図５は、このようなＬＥＤを用いたサイドライト型の照明装置を備えた液晶表示装置の概略構成を示した分解斜視図および要部の断面図である。 In particular, those using LEDs as the light source of such a sidelight type illumination device are particularly attracting attention because they have the advantages of long life and high luminous efficiency. 4 and 5 are an exploded perspective view and a cross-sectional view of the main part showing a schematic configuration of a liquid crystal display device including a sidelight type illumination device using such an LED.
　図示されるように液晶表示装置１００は、ベゼル１０２、液晶表示パネル１０３、および照明装置１０４を備える。 As illustrated, the liquid crystal display device 100 includes a bezel 102, a liquid crystal display panel 103, and a lighting device 104.
　ベゼル１０２は、液晶表示パネル１０３の周縁に被せられる額縁形状を有しており、シャーシ１１４と共に液晶表示装置１００全体の強度を確保するものである。液晶表示パネル１０３は、２枚のガラスを貼り合わせてその間に液晶を封止したもので、前面に画像を表示することができるようになっている。 The bezel 102 has a frame shape that covers the periphery of the liquid crystal display panel 103, and ensures the strength of the entire liquid crystal display device 100 together with the chassis 114. The liquid crystal display panel 103 is formed by bonding two pieces of glass and sealing the liquid crystal therebetween, so that an image can be displayed on the front surface.
　照明装置１０４は、浅底の箱形状を有するシャーシ１１４を備えており、このシャーシ１１４の内部には、光学シート１０７～１０９、導光板１１１、第１反射シート１１０および複数のＬＥＤ１２１が実装されたＬＥＤ基板１２０が収納可能とされている。 The illuminating device 104 includes a chassis 114 having a shallow box shape. Inside the chassis 114, optical sheets 107 to 109, a light guide plate 111, a first reflecting sheet 110, and a plurality of LEDs 121 are mounted. The LED board 120 can be stored.
　図５に示されるように、導光板１１１は、ＬＥＤ基板１２０が備えるＬＥＤ１２１からの光を導入するための光入射面１１１ａと、その光入射面１１１ａから導入された光を上方向（照射方向）に出射するための光出射面１１１ｂとを有している。光入射面１１１ａは、導光板１１１の所定の側端面によって構成されると共に、光出射面１１１ｂは導光板１１１の前面によって構成されている。 As shown in FIG. 5, the light guide plate 111 includes a light incident surface 111 a for introducing light from the LEDs 121 included in the LED substrate 120, and the light introduced from the light incident surface 111 a upward (irradiation direction). And a light emitting surface 111b for emitting the light. The light incident surface 111 a is configured by a predetermined side end surface of the light guide plate 111, and the light emitting surface 111 b is configured by the front surface of the light guide plate 111.
　第１反射シート１１０は、導光板１１１の光出射面１１１ｂとは反対側の背面１１１ｃを覆うように配置されている。また、光学シート１０７～１０９は、拡散シートやレンズシートなどを含んでおり、導光板１１１の光出射面１１１ｂの上に配置されている。 The first reflection sheet 110 is disposed so as to cover the back surface 111c of the light guide plate 111 opposite to the light emitting surface 111b. The optical sheets 107 to 109 include a diffusion sheet, a lens sheet, and the like, and are disposed on the light emitting surface 111b of the light guide plate 111.
　これら、光学シート１０７～１０９、導光板１１１、第１反射シート１１０は、フレーム１０５によってシャーシ１１４の底板部１１４ａ上に、積層された状態で固定されている。 The optical sheets 107 to 109, the light guide plate 111, and the first reflection sheet 110 are fixed in a stacked state on the bottom plate portion 114a of the chassis 114 by the frame 105.
　また、ＬＥＤ基板１２０に備えられた複数個のＬＥＤ１２１は、導光板１１１の光入射面１１１ａの近傍に配置されている。更に、ＬＥＤ１２１の発光面１２１ａが導光板１１１の光入射面１１１ａに対向するように、その光入射面１１１ａに沿って所定の間隔を隔てて配置されている。ＬＥＤ基板１２０は、シャーシ１１４の側壁部１１４ｂ近傍の底板部１１４ａ上に設けられた支持部材（Ｌ字形の取り（据え）付け用金具）１１５によって、底板部１１４ａに対して垂直に起立した状態になるように保持されている。 Further, the plurality of LEDs 121 provided on the LED substrate 120 are arranged in the vicinity of the light incident surface 111 a of the light guide plate 111. Further, the light emitting surface 121a of the LED 121 is arranged at a predetermined interval along the light incident surface 111a so as to face the light incident surface 111a of the light guide plate 111. The LED board 120 is erected vertically with respect to the bottom plate portion 114a by a support member (L-shaped mounting (mounting) mounting bracket) 115 provided on the bottom plate portion 114a in the vicinity of the side wall portion 114b of the chassis 114. Is held to be.
　この場合、シャーシ１１４の底板部１１４ａには下方に突出した凸部１１４ｄが設けられており、この凸部１１４ｄに支持部材１１５が固定されるようになっている。凸部１１４ｄの上面には、片面に粘着層を有する帯状の第２反射シート１１６が接着（貼付）されている。この第２反射シート１１６は、第１反射シート１１０とＬＥＤ１２１との間の隙間を埋めるように配されており、ＬＥＤ１２１からの光を反射するように構成されている。 In this case, the bottom plate portion 114a of the chassis 114 is provided with a convex portion 114d protruding downward, and the support member 115 is fixed to the convex portion 114d. A band-shaped second reflection sheet 116 having an adhesive layer on one side is adhered (attached) to the upper surface of the convex portion 114d. The second reflection sheet 116 is disposed so as to fill a gap between the first reflection sheet 110 and the LED 121, and is configured to reflect light from the LED 121.
　また、フレーム１０５の下面１０５ｃには、片面に粘着層を有する帯状の第３反射シート１１７が接着（貼付）されている。この第３反射シート１１７は、ＬＥＤ１２１からの光を反射する機能を有すると共に、導光板１１１の端部上面に当接して、その導光板１１１をシャーシ１１４の底板部１１４ａとの間で挟持する押さえ部としての機能も有している。尚、本発明に関連する先行技術文献としては下記特許文献が挙げられる。 Further, a strip-shaped third reflection sheet 117 having an adhesive layer on one side is bonded (attached) to the lower surface 105c of the frame 105. The third reflection sheet 117 has a function of reflecting light from the LED 121 and is in contact with the upper surface of the end portion of the light guide plate 111 to hold the light guide plate 111 with the bottom plate portion 114 a of the chassis 114. It also has a function as a part. In addition, the following patent document is mentioned as a prior art document relevant to this invention.
特開２０１０－１３４４１３号公報JP 2010-134413 A
　しかしながら、このような照明装置１００においては、ＬＥＤ１２１の点灯による温度上昇によって構成する部材に熱膨張、あるいはＬＥＤ１２１の消灯による温度低下によって熱収縮が起きる。特に導光板１１１とフレーム１０５の線膨張係数の違いや体積の違いによるそれらの熱膨張や熱収縮に時間差が生じるため、フレーム１０５の下面１０５ｃに設けられた第３反射シート１１７と、この第３反射シート１１７が当接される導光板１１１のとの間に擦れが生じ、これが図５に示されるような「ピキッ」などの異音（軋み音）Ｎを発生させてしまうという問題があった。 However, in such an illuminating device 100, thermal contraction occurs due to thermal expansion of a member formed by the temperature increase due to the lighting of the LED 121, or temperature decrease due to the LED 121 being turned off. In particular, since there is a time difference in thermal expansion and contraction due to differences in linear expansion coefficients and volumes between the light guide plate 111 and the frame 105, the third reflection sheet 117 provided on the lower surface 105c of the frame 105, and the third There is a problem that rubbing occurs with the light guide plate 111 against which the reflection sheet 117 is abutted, and this generates an abnormal sound (smearing sound) N such as “pick” as shown in FIG. .
　本発明が解決する課題は、上面が開口された箱形状をしたシャーシ内に収容される導光板の外周縁に沿って前記シャーシ上にフレームが装着される状態において、光源の発熱による導光板とフレームの下面に設けられた反射シートとの間での摩擦による異音の発生を抑制する照明装置およびこれを備えた液晶表示装置を提供することである。 The problem to be solved by the present invention is that, in a state where the frame is mounted on the chassis along the outer peripheral edge of the light guide plate housed in the box-shaped chassis having an upper surface opened, An object of the present invention is to provide an illumination device that suppresses the generation of abnormal noise due to friction with a reflection sheet provided on the lower surface of a frame, and a liquid crystal display device including the same.
　上記課題を解決するため本発明に係る照明装置は、上面が開口された箱形状を有するシャーシと、該シャーシ内に収容される板形状を有する導光板と、該導光板の外周端部に沿って延在する額縁形状を有して前記シャーシの上側に装着されるフレームと、前記導光板の所定の側端面に光を照射するための光源とを備え、前記フレームの下面には、前記導光板を前記シャーシとの間で挟持する押さえ部としての機能と、光を反射する機能とを有する反射シートが接着されると共に、この反射シートの下側表面と前記導光板との間には低摩擦部材が介在されていることを要旨とするものである。 In order to solve the above-described problems, a lighting device according to the present invention includes a chassis having a box shape with an upper surface opened, a light guide plate having a plate shape accommodated in the chassis, and an outer peripheral end portion of the light guide plate. A frame having a frame shape extending on the upper side of the chassis, and a light source for irradiating light to a predetermined side end surface of the light guide plate. A reflection sheet having a function as a pressing portion for sandwiching the light plate between the chassis and a function of reflecting light is adhered, and a low surface is provided between the lower surface of the reflection sheet and the light guide plate. The gist is that a friction member is interposed.
　このような構成の照明装置によれば、フレームの下面に接着され、導光板をシャーシとの間で挟持する押さえ部としての反射シートの下側表面と導光板との間には、低摩擦部材が介在されているので、導光板とフレームにおいて線膨張係数の違う部材が使用されても、低摩擦部材によってそれらが互いに滑らかに摺動するため、光源点灯による温度上昇によって生じる熱膨張や光源消灯による温度低下によって生じる熱収縮が発生しても、導光板と反射シートとの間の摩擦によって生じる異音（軋み音）の発生が抑制される。 According to the illuminating device having such a configuration, a low-friction member is bonded between the lower surface of the reflection sheet and the light guide plate, which is bonded to the lower surface of the frame and holds the light guide plate with the chassis. Therefore, even if members with different linear expansion coefficients are used in the light guide plate and the frame, they slide smoothly with each other due to the low friction member. Even if the thermal shrinkage caused by the temperature drop due to the occurrence of the noise, the generation of abnormal noise (stagnation sound) caused by friction between the light guide plate and the reflection sheet is suppressed.
　この場合、前記低摩擦部材は、前記反射シートの下側表面に接着された透明シートである構成にするのが好ましい。このような構成によれば、フレームの下面に接着された反射シートの下側表面に、例えば片面に粘着層を有する透明シートを接着しておき、そのフレームを導光板が収容されたシャーシに装着するだけで、簡便に反射シートの下側表面と導光板との間に、透明シート（低摩擦部材）を介在させることができる。また、透明シートであることから、反射シートの下側表面の光反射特性に影響を与えてしまうことが防止される。 In this case, the low friction member is preferably a transparent sheet adhered to the lower surface of the reflective sheet. According to such a configuration, for example, a transparent sheet having an adhesive layer on one side is adhered to the lower surface of the reflective sheet adhered to the lower surface of the frame, and the frame is attached to the chassis in which the light guide plate is accommodated. By simply doing, a transparent sheet (low friction member) can be interposed between the lower surface of the reflective sheet and the light guide plate. Moreover, since it is a transparent sheet, it is prevented that the light reflection characteristic of the lower surface of a reflection sheet is affected.
　また、前記低摩擦部材は、前記反射シートの下側表面にコーティングされた透明樹脂膜である構成にするのが好ましい。このような構成によれば、そのような下側表面が透明樹脂膜でコーティングされた反射シートをフレームの下面に接着しておき、そのフレームを導光板が収容されたシャーシに装着するだけで、簡便に反射シートの下側表面と導光板との間に、透明樹脂膜（低摩擦部材）を介在させることができる。また、透明樹脂膜であることから、反射シートの下側表面の光反射特性に影響を与えてしまうことが防止される。 The low friction member is preferably a transparent resin film coated on the lower surface of the reflective sheet. According to such a configuration, by simply attaching the reflection sheet whose lower surface is coated with a transparent resin film to the lower surface of the frame, and mounting the frame to the chassis containing the light guide plate, A transparent resin film (low friction member) can be easily interposed between the lower surface of the reflection sheet and the light guide plate. Moreover, since it is a transparent resin film, it is prevented that the light reflection characteristic of the lower surface of a reflection sheet is affected.
　更に、前記低摩擦部材は、前記反射シートの下側表面に塗布された潤滑性グリスである構成にするのが好ましい。このような構成によれば、フレームの下面に接着された反射シートの下側表面に、潤滑性グリスを塗布しておき、そのフレームを導光板が収容されたシャーシに装着するだけで、簡便に反射シートの下側表面と導光板との間に、潤滑性グリス（低摩擦部材）を介在させることができる。この場合、潤滑性グリスが透明である場合には、反射シートの下側表面の光反射特性に影響を与えてしまうことが防止される。尚、潤滑性グリスが白色を呈するグリスであっても良い。 Furthermore, it is preferable that the low friction member is made of a lubricating grease applied to the lower surface of the reflection sheet. According to such a configuration, the lubricating grease is applied to the lower surface of the reflection sheet bonded to the lower surface of the frame, and the frame is simply attached to the chassis containing the light guide plate. Lubricating grease (low friction member) can be interposed between the lower surface of the reflection sheet and the light guide plate. In this case, when the lubricating grease is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the reflection sheet from being affected. The lubricating grease may be white.
　また、上記課題を解決するために、本発明に係る液晶表示装置は、このような照明装置と、その照明装置からの光を利用して表示を行う液晶表示パネルとを備えることを要旨とするものである。このような液晶表示装置によれば、照明装置の使用時または使用後において異音の発生が抑制されているので、液晶表示装置の品質を向上させることができる。 Moreover, in order to solve the said subject, the liquid crystal display device which concerns on this invention makes it a summary to provide such an illuminating device and the liquid crystal display panel which performs a display using the light from the illuminating device. Is. According to such a liquid crystal display device, since the generation of abnormal noise is suppressed during or after use of the illumination device, the quality of the liquid crystal display device can be improved.
　本発明によれば、導光板とこれに当接するフレームの反射シートとの間に低摩擦部材が介在されているので、両者の間の摩擦による異音の発生を抑制することが可能である。 According to the present invention, since the low friction member is interposed between the light guide plate and the reflection sheet of the frame in contact with the light guide plate, it is possible to suppress the generation of noise due to friction between the two.
本発明の実施形態に係る液晶表示装置の概略構成を模式的に示した分解斜視図である。1 is an exploded perspective view schematically showing a schematic configuration of a liquid crystal display device according to an embodiment of the present invention. 図１の液晶表示装置の組み立て後の要部を拡大して示した断面図である。It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG. （ａ）はフレームの下面に設けられた反射シートに透明シートを貼り付ける（接着する）状態を示した図、（ｂ）は透明樹脂膜がコーティングされた反射シートをフレームの下面に貼り付ける（接着する）状態を示した図、（ｃ）はフレームの下面に設けられた反射シートに潤滑性グリスを塗布する状態を示した図である。(A) is the figure which showed the state which affixes a transparent sheet to the reflection sheet provided in the lower surface of the flame | frame, (b) is affixing the reflection sheet coated with the transparent resin film on the lower surface of a flame | frame ( The figure which showed the state which adhere | attaches, (c) is the figure which showed the state which apply | coats lubricating grease to the reflective sheet provided in the lower surface of the flame | frame. 従来用いられてきた液晶表示装置の概略構成を示した分解斜視図である。It is the disassembled perspective view which showed schematic structure of the liquid crystal display device used conventionally. 図４の液晶表示装置の組み立て後の要部を拡大して示した断面図である。It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG.
　以下に、本発明に係る照明装置およびこれを備えた液晶表示装置の実施の形態ついて、図面を参照して詳細に説明する。 Hereinafter, embodiments of a lighting device and a liquid crystal display device including the same according to the present invention will be described in detail with reference to the drawings.
　図１は、本実施形態に係る液晶表示装置を模式的に示した分解斜視図である。液晶表示装置１は、液晶表示パネル３と、この液晶表示パネル３に光を照射するための照明装置（バックライト装置）４とを備え、これらがベゼル２などにより一体的に保持されるようになっている。ベゼル２は、液晶表示パネル３の周縁に被せられる額縁形状を有しており、照明装置４が備えるシャーシ１４と共に液晶表示装置１全体の強度を確保するものである。 FIG. 1 is an exploded perspective view schematically showing a liquid crystal display device according to this embodiment. The liquid crystal display device 1 includes a liquid crystal display panel 3 and an illumination device (backlight device) 4 for irradiating the liquid crystal display panel 3 with light, and these are integrally held by a bezel 2 or the like. It has become. The bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with the chassis 14 included in the illumination device 4.
　液晶表示パネル３は、平面に視て横長の長方形状を有している。この液晶表示パネル３は、薄膜トランジスタ（ＴＦＴ）アレイ基板とカラーフィルタ（ＣＦ）基板とからなる一対のガラス基板が所定の間隔を置いて平行に対向して貼り合わせられ、両ガラス基板間に液晶が封止された構成をなしている。 The liquid crystal display panel 3 has a horizontally long rectangular shape when viewed from above. In this liquid crystal display panel 3, a pair of glass substrates comprising a thin film transistor (TFT) array substrate and a color filter (CF) substrate are bonded together in parallel at a predetermined interval, and a liquid crystal is sandwiched between the glass substrates. It has a sealed configuration.
　ＴＦＴアレイ基板には複数のＴＦＴおよび画素電極がマトリクス状に形成され、ＣＦ基板には複数の着色パターンがマトリクス状に形成されると共に、そのほぼ全面に共通電極が形成されており、これら画素電極と共通電極との間に印加する電圧を変化させて液晶を配向制御することで、画像を表示することができるようになっている。尚、液晶表示パネル３の表面と背面にはそれぞれ偏光板が配されている。 A plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate, and a plurality of colored patterns are formed in a matrix on the CF substrate, and a common electrode is formed on almost the entire surface. An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the first electrode and the common electrode. A polarizing plate is disposed on each of the front and back surfaces of the liquid crystal display panel 3.
　照明装置４は、いわゆるサイドライト型（エッジライト型）の照明装置である。図示されるように照明装置４は、液晶表示パネル３側に向けて開口した開口部を有した略箱形のシャーシ１４と、シャーシ１４の開口部を覆うように配される光学シート７～９を備える。また、シャーシ１４の内部には、光源であるＬＥＤ（発光ダイオード）２１が複数実装されたＬＥＤ基板２０と、ＬＥＤ２１からの光を液晶表示パネル３側へと導く導光板１１と、この導光板１１の背面側に配される第１反射シート１０を備える。 The illumination device 4 is a so-called side light type (edge light type) illumination device. As shown in the drawing, the illumination device 4 includes a substantially box-shaped chassis 14 having an opening opened toward the liquid crystal display panel 3 side, and optical sheets 7 to 9 arranged so as to cover the opening of the chassis 14. Is provided. Further, inside the chassis 14, an LED substrate 20 on which a plurality of LEDs (light emitting diodes) 21 that are light sources are mounted, a light guide plate 11 that guides light from the LEDs 21 to the liquid crystal display panel 3 side, and the light guide plate 11. The 1st reflective sheet 10 distribute | arranged to the back side is provided.
　フレーム５は、光学シート７～９、導光板１１および第１反射シート１０を、この順番で上から積層させた状態でシャーシ１４に固定するためのものである。この場合、フレーム５は、導光板１１の外周端部に沿って延在する枠状（額縁状）に形成されており、光学シート７～９および導光板１１の外周端部をほぼ全周にわたって表側から押さえることが可能となっている。尚、フレーム５は、例えば黒塗りされた金属製の部材または黒色の合成樹脂製の部材とされ、遮光性を有するものである。また、フレーム５は、液晶表示パネル３の外周端部の背面を、枠部５ａの上面の内側に形成された凹面５ｂで受けることが可能になっている。 The frame 5 is for fixing the optical sheets 7 to 9, the light guide plate 11, and the first reflection sheet 10 to the chassis 14 in a state where they are laminated in this order from above. In this case, the frame 5 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 11, and the outer peripheral end portions of the optical sheets 7 to 9 and the light guide plate 11 extend over substantially the entire circumference. It can be pressed from the front side. The frame 5 is, for example, a black metal member or a black synthetic resin member, and has a light shielding property. Further, the frame 5 can receive the back surface of the outer peripheral end portion of the liquid crystal display panel 3 with a concave surface 5b formed inside the upper surface of the frame portion 5a.
　シャーシ１４は、アルミなどからなる金属製の板材を折り曲げ加工等によって浅底の箱形状に成形されており、その内部に光学シート７～９、導光板１１、第１反射シート１０、支持部材１５およびＬＥＤ基板２０を収容することができるようなっている。シャーシ１４は、平面に視て横長の長方形状を有した底板部１４ａと、この底板部１４ａの四辺の外縁から立ち上がる側板部１４ｂとから構成される。また、側板部１４ｂには、上述したフレーム５およびベゼル２がネジ止め等によって固定可能とされている。 The chassis 14 is formed into a shallow box shape by bending a metal plate made of aluminum or the like, and the optical sheets 7 to 9, the light guide plate 11, the first reflection sheet 10, and the support member 15 are formed therein. And the LED board 20 can be accommodated. The chassis 14 includes a bottom plate portion 14a having a horizontally long rectangular shape when viewed from above and a side plate portion 14b rising from the outer edges of the four sides of the bottom plate portion 14a. Further, the above-described frame 5 and bezel 2 can be fixed to the side plate portion 14b by screws or the like.
　３枚の光学シート７～９は、平面に視て横長の長方形状を有した薄い樹脂製のシートで構成される。光学シート７～９は、導光板１１の表側（光出射側）に載せられて液晶表示パネル３と導光板１１との間に介在して配される。これら光学シート７～９としては、上から順に例えば、厚さが０．１～０．５ｍｍ程度の偏光選択性反射シート７、レンズシート８、拡散シート９が用いられている。 The three optical sheets 7 to 9 are composed of thin resin sheets having a horizontally long rectangular shape when seen in a plan view. The optical sheets 7 to 9 are placed on the front side (light emitting side) of the light guide plate 11 and are interposed between the liquid crystal display panel 3 and the light guide plate 11. As these optical sheets 7 to 9, for example, a polarization selective reflection sheet 7, a lens sheet 8 and a diffusion sheet 9 having a thickness of about 0.1 to 0.5 mm are used in order from the top.
　この場合、拡散シート９は、導光板１１から出射される光を拡散させることで、輝度分布を均一にするためのものである。レンズシート８は、拡散シート９から出射される光を集光することで、正面輝度を高めるためのものである。また、偏光選択性反射シート７は、レンズシート８から出射された光が液晶表示パネル３の背面に貼り付けられた図示しない偏光板に吸収されないように選択的に反射させるためのものである。 In this case, the diffusion sheet 9 is for making the luminance distribution uniform by diffusing the light emitted from the light guide plate 11. The lens sheet 8 is for increasing the front luminance by condensing the light emitted from the diffusion sheet 9. The polarization selective reflection sheet 7 is for selectively reflecting the light emitted from the lens sheet 8 so that the light is not absorbed by a polarizing plate (not shown) attached to the back surface of the liquid crystal display panel 3.
　導光板１１は、平面に視て横長の長方形状を有して、例えば厚さが３～４ｍｍ程度の透明な樹脂製の板で構成される。導光板１１は、ＬＥＤ２１からの光を導入するための光入射面１１ａと、その光入射面１１ａから導入された光を上方向（照射方向）に出射するための光出射面１１ｂとを有している。光入射面１１ａは、導光板１１の所定の側端面によって構成されると共に、光出射面１１ｂは導光板１１の前面によって構成されている。 The light guide plate 11 is formed of a transparent resin plate having a horizontally long rectangular shape in a plan view and having a thickness of about 3 to 4 mm, for example. The light guide plate 11 has a light incident surface 11a for introducing light from the LED 21 and a light emission surface 11b for emitting light introduced from the light incident surface 11a upward (irradiation direction). ing. The light incident surface 11 a is configured by a predetermined side end surface of the light guide plate 11, and the light emitting surface 11 b is configured by the front surface of the light guide plate 11.
　導光板１１は、光入射面１１ａから入射した光を光出射面（前面）１１ｂと、この光出射面１１ｂとは反対側の背面１１ｃとの間で繰り返し反射させて、その内部で平面状に広げることが可能になっている。図示しないが、導光板１１の背面１１ｃには、光入射面１１ａから入射した光を散乱させて光出射面１１ｂから出射させるための複数個の散乱部が形成されている。このような散乱部としては、白色顔料等を含む塗料を導光板１１の背面１１ｃに斑点状に印刷して形成されたものなどが適用される。 The light guide plate 11 reflects light incident from the light incident surface 11a repeatedly between the light emitting surface (front surface) 11b and the back surface 11c opposite to the light emitting surface 11b, and forms a planar shape inside the light guiding plate 11 It can be expanded. Although not shown, a plurality of scattering portions are formed on the back surface 11c of the light guide plate 11 to scatter light incident from the light incident surface 11a and emit the light from the light emitting surface 11b. As such a scattering part, what was formed by printing the coating material containing a white pigment etc. on the back surface 11c of the light-guide plate 11 in the shape of a spot is applied.
　第１反射シート１０は、導光板１１の光出射面１１ｂとは反対側の背面１１ｃを覆うように配置されており、この場合、シャーシ１４の底板部１４ａ上に敷かれている。この第１反射シート１０は、導光板１１の背面１１ｃから背面側へと出射される光を導光板１１側に反射させるためのもので、例えば厚さが０．１～２ｍｍ程度の樹脂製のシートで構成される。この場合、反射シート１０の前面は、白色を呈しており、導光板１１の背面１１ｃから出射される光を導光板１１側に効率良く反射させその光の利用効率および導光板１１の光出射面１１ｂでの輝度を高めている。 The first reflection sheet 10 is disposed so as to cover the back surface 11c of the light guide plate 11 opposite to the light emitting surface 11b. In this case, the first reflection sheet 10 is laid on the bottom plate portion 14a of the chassis 14. The first reflecting sheet 10 is for reflecting light emitted from the back surface 11c of the light guide plate 11 to the back side toward the light guide plate 11, and is made of a resin having a thickness of about 0.1 to 2 mm, for example. Consists of sheets. In this case, the front surface of the reflection sheet 10 is white, and the light emitted from the back surface 11c of the light guide plate 11 is efficiently reflected to the light guide plate 11 side so that the light utilization efficiency and the light emission surface of the light guide plate 11 are improved. The brightness at 11b is increased.
　このように照明装置４は、光学シート７～９、導光板１１および第１反射シート１０によって、ＬＥＤ２１からの光を面状の光に変換して液晶表示パネル３の背面側に照射できるようになっている。尚、シャーシ４の背面には、ＬＥＤ基板２０に電源を供給する電源基板１８と、液晶表示パネル３を駆動するコントロール基板１９が配設されている。 As described above, the illumination device 4 can convert the light from the LED 21 into the planar light by the optical sheets 7 to 9, the light guide plate 11, and the first reflection sheet 10 and irradiate the back side of the liquid crystal display panel 3. It has become. A power supply board 18 that supplies power to the LED board 20 and a control board 19 that drives the liquid crystal display panel 3 are disposed on the rear surface of the chassis 4.
　ＬＥＤ基板２０に備えられた複数個のＬＥＤ２１は、導光板１１の光入射面１１ａの近傍に配置されている。ＬＥＤ２１は、例えば青色光を発生させるＬＥＤチップを、黄色蛍光体が混合された透明樹脂で密封したパッケージ構造を有しており、ＬＥＤ２１の発光面２１ａから白色光を放出することが可能となっている。このようなＬＥＤ２１は、その発光面２１ａが導光板１１の光入射面１１ａに対向するように、その光入射面１１ａに沿って所定の間隔を隔てて配置されている。 The plurality of LEDs 21 provided on the LED substrate 20 are disposed in the vicinity of the light incident surface 11 a of the light guide plate 11. The LED 21 has a package structure in which, for example, an LED chip that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and white light can be emitted from the light emitting surface 21a of the LED 21. Yes. Such LEDs 21 are arranged at a predetermined interval along the light incident surface 11 a so that the light emitting surface 21 a faces the light incident surface 11 a of the light guide plate 11.
　図２に示されるように、ＬＥＤ基板２０は、アルミなどの金属製の基材２２を備えている。この基材２２（ＬＥＤ基板２０）は、横長の帯形状を有している。また、基材２２の前面には絶縁層２３が形成されており、この絶縁層２３の上には、その長手方向に沿って複数個のＬＥＤ２１，２１，２１，・・・が一直線に並ぶように実装されている。これら複数個のＬＥＤ２１は、絶縁層２３上に形成された図示しない配線パターンによって直列に接続されている。 As shown in FIG. 2, the LED substrate 20 includes a base material 22 made of metal such as aluminum. This base material 22 (LED substrate 20) has a horizontally long belt shape. Further, an insulating layer 23 is formed on the front surface of the base material 22, and a plurality of LEDs 21, 21, 21,... Are aligned on the insulating layer 23 along the longitudinal direction thereof. Has been implemented. The plurality of LEDs 21 are connected in series by a wiring pattern (not shown) formed on the insulating layer 23.
　この場合、ＬＥＤ基板２０の基材２２は、ＬＥＤ２１の発熱による温度上昇を抑制する機能を有している。この基材２２と支持部材１５との間には、図示しない熱伝導シートが介在されており、ＬＥＤ２１が発した熱は、基材２２、熱伝導シートおよび支持部材１５を介してシャーシ１４の底板部１４ａ（凸部１４ｄ）に熱伝導することで、ＬＥＤ２１の温度が上昇し過ぎないように抑制されている。 In this case, the base material 22 of the LED substrate 20 has a function of suppressing a temperature rise due to heat generation of the LED 21. A heat conduction sheet (not shown) is interposed between the base material 22 and the support member 15, and the heat generated by the LED 21 is transmitted to the bottom plate of the chassis 14 via the base material 22, the heat conduction sheet and the support member 15. By conducting heat to the portion 14a (convex portion 14d), the temperature of the LED 21 is suppressed so as not to rise excessively.
　ＬＥＤ基板２０は、シャーシ１４の側板部１４ｂ近傍の底板部１４ａに配される支持部材１５に立てた状態（起立した状態）で取り付けられている。この支持部材１５は、いわゆるブラケット（Ｌ字形の取り（据え）付け用金具）のような形状を有している。この場合、シャーシ１４の底板部１４ａには下方に突出した凸部１４ｄが設けられており、この凸部１４ｄに支持部材１１５が固定されるようになっている。 The LED board 20 is attached in a standing state (standing state) on the support member 15 disposed on the bottom plate portion 14a in the vicinity of the side plate portion 14b of the chassis 14. The support member 15 has a shape like a so-called bracket (an L-shaped mounting (fixing) fitting). In this case, the bottom plate portion 14a of the chassis 14 is provided with a convex portion 14d protruding downward, and the support member 115 is fixed to the convex portion 14d.
　また、凸部１４ｄの上面には、片面に粘着層を有する帯状の第２反射シート１６が接着（貼付）されている。この第２反射シート１６は、その上面が白色を呈しており、図２に示されるように、第１反射シート１０とＬＥＤ２１との間の隙間を埋めるように配されてＬＥＤ２１からの光を反射するように構成されている。 Further, a belt-like second reflection sheet 16 having an adhesive layer on one side is adhered (attached) to the upper surface of the convex portion 14d. The upper surface of the second reflective sheet 16 is white, and as shown in FIG. 2, the second reflective sheet 16 is arranged so as to fill a gap between the first reflective sheet 10 and the LED 21 and reflects light from the LED 21. Is configured to do.
　また、図２に示されるように、フレーム５の下面５ｃには、片面に粘着層を有する帯状の第３反射シート１７が接着（貼付）されている。この第３反射シート１７は、その下面が白色を呈しており、ＬＥＤ２１からの光を反射する機能を有すると共に、導光板１１の端部上面に当接して、その導光板１１をシャーシ１４の底板部１１４ａとの間で挟持する押さえ部としての機能も有している。 Further, as shown in FIG. 2, a strip-shaped third reflection sheet 17 having an adhesive layer on one side is adhered (attached) to the lower surface 5 c of the frame 5. The third reflection sheet 17 has a white lower surface, has a function of reflecting light from the LED 21, abuts against the upper surface of the end of the light guide plate 11, and makes the light guide plate 11 a bottom plate of the chassis 14. It also has a function as a pressing part that is sandwiched between the part 114a.
　図２に示されるように、第３反射シート１７の下面（表面）には、その下面を覆うように低摩擦部材３１が設けられている。 As shown in FIG. 2, a low friction member 31 is provided on the lower surface (front surface) of the third reflection sheet 17 so as to cover the lower surface.
　このように導光板１１をシャーシ１４との間で挟持するフレーム５の押さえ部としての第３反射シート１７の下側表面と導光板１１の端部上面との間には、低摩擦部材３１が介在されている構成とすることで、導光板１１とフレーム５において線膨張係数の違う部材が使用されても、低摩擦部材３１によってそれらが互いに滑らかに摺動するため、ＬＥＤ２１の点灯による温度上昇によって生じる熱膨張やＬＥＤ２１の消灯による温度低下によって生じる熱収縮が発生しても、導光板１１と反射シート１７との間の摩擦によって生じる異音（軋み音）の発生が抑制されている。 In this manner, the low friction member 31 is interposed between the lower surface of the third reflection sheet 17 serving as a pressing portion of the frame 5 that sandwiches the light guide plate 11 with the chassis 14 and the upper end surface of the light guide plate 11. Due to the interposed configuration, even if members having different linear expansion coefficients are used in the light guide plate 11 and the frame 5, they slide smoothly with each other by the low friction member 31. Even if thermal contraction caused by thermal expansion caused by the LED 21 or temperature drop due to the turn-off of the LED 21 occurs, generation of abnormal noise (stagnation sound) caused by friction between the light guide plate 11 and the reflection sheet 17 is suppressed.
　このような低摩擦部材３１としては、図３に示されるようなものが適用可能である。図３（ａ）は、低摩擦部材３１として、透明シート３１Ａが用いられている。この透明シート３１Ａは、表面（下面）が平滑な樹脂製のシートで、裏面（上面）に粘着層を有している。このような透明シート３１Ａの具体的な例としては、ＰＥＴ、フッ素樹脂やテフロン（登録商標）などからなるシート状またはテープ状のものが例示できる。 As such a low friction member 31, the one shown in FIG. 3 is applicable. In FIG. 3A, a transparent sheet 31 </ b> A is used as the low friction member 31. This transparent sheet 31A is a resin sheet having a smooth surface (lower surface), and has an adhesive layer on the back surface (upper surface). As a specific example of such a transparent sheet 31A, a sheet-like or tape-like one made of PET, fluororesin, Teflon (registered trademark), or the like can be exemplified.
　この場合、図示されるように、フレーム５の下面５ｃに接着された第３反射シート１７の下側表面に、片面に粘着層を有する透明シート３１Ａを接着しておき、そのフレーム５を導光板１１が収容されたシャーシ１４に装着するだけで、簡便に第３反射シート１７の下側表面と導光板１１の端部上面との間に透明シート３１Ａ（低摩擦部材３１）を介在させることができる。また、透明シート３１Ａは透明であることから、第３反射シート１７の下側表面の光反射特性に影響を与えてしまうことが防止されている。尚、上述した低摩擦部材３１Ａの表面（下面）、つまり導光板１１の端部上面との当接面は、導光板１１との滑りが良好であれば良く、必ずしも平滑である必要はない。 In this case, as shown in the drawing, a transparent sheet 31A having an adhesive layer on one side is bonded to the lower surface of the third reflection sheet 17 bonded to the lower surface 5c of the frame 5, and the frame 5 is connected to the light guide plate. The transparent sheet 31 </ b> A (low friction member 31) can be easily interposed between the lower surface of the third reflection sheet 17 and the upper surface of the end portion of the light guide plate 11 simply by being attached to the chassis 14 in which 11 is accommodated. it can. Further, since the transparent sheet 31A is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the third reflection sheet 17 from being affected. Note that the surface (lower surface) of the low-friction member 31A described above, that is, the contact surface with the upper surface of the end portion of the light guide plate 11 only needs to slide well with the light guide plate 11, and is not necessarily smooth.
　図３（ｂ）は、低摩擦部材３１として、第３反射シート１７の表面（下面）にコーティングされた透明樹脂膜３１Ｂが用いられている。この透明樹脂膜３１Ｂとしてはポリエチレン膜などが例示される。 In FIG. 3B, a transparent resin film 31 </ b> B coated on the surface (lower surface) of the third reflection sheet 17 is used as the low friction member 31. Examples of the transparent resin film 31B include a polyethylene film.
　この場合、図示されるように、下側表面に透明樹脂膜３１Ｂがコーティングされた第３反射シート１７をフレーム５の下面５ｃに接着しておき、そのフレーム５を導光板１１が収容されたシャーシ１４に装着するだけで、簡便に第３反射シート１７の下側表面と導光板１１の端部上面との間に、透明樹脂膜３１Ｂ（低摩擦部材３１）を介在させることができる。また、透明樹脂膜３１Ｂは透明であることから、第３反射シート１７の下側表面の光反射特性に影響を与えてしまうことが防止されている。尚、上述した低摩擦部材３１Ｂの表面（下面）、つまり導光板１１の端部上面との当接面は、導光板１１との滑りが良好であれば良く、必ずしも平滑である必要はない。 In this case, as shown in the drawing, a third reflection sheet 17 having a lower surface coated with a transparent resin film 31B is adhered to the lower surface 5c of the frame 5, and the frame 5 is a chassis in which the light guide plate 11 is accommodated. 14, the transparent resin film 31B (low friction member 31) can be interposed between the lower surface of the third reflection sheet 17 and the upper surface of the end portion of the light guide plate 11 simply. Further, since the transparent resin film 31B is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the third reflection sheet 17 from being affected. It should be noted that the surface (lower surface) of the low friction member 31B described above, that is, the contact surface with the upper surface of the end portion of the light guide plate 11 only needs to slide well with the light guide plate 11 and is not necessarily smooth.
　図３（ｃ）は、低摩擦部材３１として、潤滑性グリス３１Ｃが用いられている。この潤滑性グリス３１Ｃとしてはシリコングリスなどが例示される。 In FIG. 3C, lubricating grease 31 </ b> C is used as the low friction member 31. Examples of the lubricating grease 31C include silicon grease.
　この場合、図示されるように、フレーム５の下面５ｃに接着された第３反射シート１７の下側表面に、透明な潤滑性グリス３１Ｃを塗布しておき、そのフレーム５を導光板１１が収容されたシャーシ１４に装着するだけで、簡便に第３反射シート１７の下側表面と導光板１１の端部上面との間に、潤滑性グリス３１Ｃ（低摩擦部材３１）を介在させることができる。この場合、潤滑性グリス３１Ｃが透明である場合には、反射シートの下側表面の光反射特性に影響を与えてしまうことが防止される。尚、潤滑性グリス３１Ｃは白色を呈するグリスであっても良い。 In this case, as shown in the drawing, transparent lubricating grease 31C is applied to the lower surface of the third reflecting sheet 17 adhered to the lower surface 5c of the frame 5, and the light guide plate 11 accommodates the frame 5. The lubricating grease 31 </ b> C (low friction member 31) can be easily interposed between the lower surface of the third reflection sheet 17 and the upper surface of the end portion of the light guide plate 11 simply by being mounted on the chassis 14. . In this case, when the lubricating grease 31C is transparent, it is possible to prevent the light reflection characteristics of the lower surface of the reflection sheet from being affected. The lubricating grease 31C may be white grease.
　上述した照明装置４によれば、フレーム５の下面５ｃに接着され、導光板１１をシャーシ１４との間で挟持する押さえ部としての第３反射シート１７の下側表面と導光板１１との間には、低摩擦部材３１（３１Ａ～３１Ｃ）が介在されているので、導光板１１とフレーム５において線膨張係数の違う部材が使用されても、低摩擦部材３１（３１Ａ～３１Ｃ）によってそれらが互いに滑らかに摺動するため、ＬＥＤ２１の点灯による温度上昇によって生じる熱膨張やＬＥＤ２１の消灯による温度低下によって生じる熱収縮が発生しても、導光板１１と第３反射シート１７との間の摩擦によって生じる異音（軋み音）の発生が抑制されている。したがって、このように照明装置４の使用時または使用後において異音の発生が抑制されているので、照明装置４および液晶表示装置１の品質を向上させることが可能である。 According to the illuminating device 4 described above, the light guide plate 11 is bonded to the lower surface 5 c of the frame 5 and between the lower surface of the third reflection sheet 17 and the light guide plate 11 as a pressing portion that holds the light guide plate 11 between the chassis 14. Since the low friction member 31 (31A to 31C) is interposed between the light guide plate 11 and the frame 5, even if members having different linear expansion coefficients are used, the low friction member 31 (31A to 31C) Even if thermal expansion caused by the temperature rise due to the lighting of the LED 21 or the heat shrink caused by the temperature drop due to the turning off of the LED 21 occurs because of sliding smoothly, the friction between the light guide plate 11 and the third reflection sheet 17 Occurrence of an abnormal noise (stagnation sound) is suppressed. Therefore, since the generation of abnormal noise is suppressed during or after use of the lighting device 4 in this way, the quality of the lighting device 4 and the liquid crystal display device 1 can be improved.
　以上、本発明に係る照明装置および液晶表示装置の実施の形態について説明したが、本発明はこうした実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施できることは勿論である。 The embodiments of the illumination device and the liquid crystal display device according to the present invention have been described above. However, the present invention is not limited to these embodiments, and can be variously modified without departing from the gist of the present invention. Of course, it can be implemented.
　例えば、上述した実施の形態では、ＬＥＤ基板２０（光源）を、長方形を有する導光板１１の１つの長辺に対向するように配すると共に、これに対応してフレーム５の１つの長辺側の枠部５ａの下面５ｃに第３反射シート１７および低摩擦部材３１を設けた構成について説明したが、ＬＥＤ基板２０（光源）の設置数やそれに対応した第３反射シート１７および低摩擦部材３１の設置数は適宜変更可能である。 For example, in the above-described embodiment, the LED substrate 20 (light source) is disposed so as to face one long side of the light guide plate 11 having a rectangular shape, and one long side of the frame 5 corresponding to this. The configuration in which the third reflection sheet 17 and the low friction member 31 are provided on the lower surface 5c of the frame portion 5a has been described. However, the number of LED substrates 20 (light sources) installed and the third reflection sheet 17 and the low friction member 31 corresponding thereto. The number of installations can be changed as appropriate.
　例えば、導光板１１の対向する一対の長辺のそれぞれに対向するようにＬＥＤ基板２０（光源）を配すると共に、これに対応してフレーム５の対向する長辺の一対の枠部５ａの下面５ｃに第３反射シート１７および低摩擦部材３１を設けた構成にしても良い。また、導光板１１の１つの長辺および１つの短辺にそれぞれに対向するようにＬＥＤ基板２０（光源）を配すると共に、これに対応してフレーム５の１つの長辺側の枠部５ａの下面５ｃおよび１つの短辺側の枠部５ａの下面５ｃにそれぞれ第３反射シート１７および低摩擦部材３１を設けた構成にしても良く、上述した実施の形態には限定されない。 For example, the LED substrate 20 (light source) is disposed so as to face each of the pair of opposed long sides of the light guide plate 11, and the lower surfaces of the pair of frame portions 5a of the opposed long sides of the frame 5 corresponding thereto. You may make it the structure which provided the 3rd reflective sheet 17 and the low friction member 31 in 5c. In addition, the LED substrate 20 (light source) is disposed so as to face one long side and one short side of the light guide plate 11, respectively, and the frame portion 5a on one long side of the frame 5 corresponding to this. The third reflection sheet 17 and the low-friction member 31 may be provided on the lower surface 5c and the lower surface 5c of the frame 5a on one short side, respectively, and are not limited to the above-described embodiment.

Claims (5)

  1. 　上面が開口された箱形状を有するシャーシと、該シャーシ内に収容される板形状を有する導光板と、該導光板の外周端部に沿って延在する額縁形状を有して前記シャーシの上側に装着されるフレームと、前記導光板の所定の側端面に光を照射するための光源とを備え、
    　前記フレームの下面には、前記導光板を前記シャーシとの間で挟持する押さえ部としての機能と、光を反射する機能とを有する反射シートが接着されると共に、この反射シートの下側表面と前記導光板との間には低摩擦部材が介在されていることを特徴とする照明装置。     A chassis having a box shape with an upper surface opened, a light guide plate having a plate shape accommodated in the chassis, and a frame shape extending along an outer peripheral end of the light guide plate, and an upper side of the chassis And a light source for irradiating light to a predetermined side end surface of the light guide plate,
    A reflective sheet having a function as a pressing portion for sandwiching the light guide plate with the chassis and a function of reflecting light is bonded to the lower surface of the frame, and a lower surface of the reflective sheet A lighting device, wherein a low friction member is interposed between the light guide plate and the light guide plate.
  2. 　前記低摩擦部材は、前記反射シートの下側表面に接着された透明シートであることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the low friction member is a transparent sheet adhered to a lower surface of the reflective sheet.
  3. 　前記低摩擦部材は、前記反射シートの下側表面にコーティングされた透明樹脂膜であることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the low friction member is a transparent resin film coated on a lower surface of the reflection sheet.
  4. 　前記低摩擦部材は、前記反射シートの下側表面に塗布された潤滑性グリスであることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the low friction member is a lubricating grease applied to a lower surface of the reflection sheet.
  5. 　請求項１から４のいずれか一項に記載の照明装置と、その照明装置からの光を利用して表示を行う液晶表示パネルとを備えることを特徴とする液晶表示装置。 A liquid crystal display device comprising: the illumination device according to any one of claims 1 to 4; and a liquid crystal display panel that performs display using light from the illumination device.
PCT/JP2011/075989 2010-11-12 2011-11-10 Illumination device and liquid crystal display device provided with same WO2012063917A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010253743 2010-11-12
JP2010-253743 2010-11-12

Publications (1)

Publication Number Publication Date
WO2012063917A1 true WO2012063917A1 (en) 2012-05-18

Family

ID=46051054

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/075989 WO2012063917A1 (en) 2010-11-12 2011-11-10 Illumination device and liquid crystal display device provided with same

Country Status (1)

Country Link
WO (1) WO2012063917A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102865522A (en) * 2012-10-12 2013-01-09 深圳市华星光电技术有限公司 Backlight module
WO2014148362A1 (en) * 2013-03-19 2014-09-25 堺ディスプレイプロダクト株式会社 Backlight device, and display device
JP2015176752A (en) * 2014-03-14 2015-10-05 日本精機株式会社 Lighting device and display device
JP2019125504A (en) * 2018-01-17 2019-07-25 オムロン株式会社 Surface light source device, display device and electronic equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11176224A (en) * 1997-12-10 1999-07-02 Sanyo Electric Co Ltd Surface light emitting device
JP2002190209A (en) * 2000-12-21 2002-07-05 Enplas Corp Surface light source apparatus and image display device
WO2004027314A1 (en) * 2002-09-19 2004-04-01 Matsushita Electric Industrial Co., Ltd. Illumination unit and liquid crystal display comprising it

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11176224A (en) * 1997-12-10 1999-07-02 Sanyo Electric Co Ltd Surface light emitting device
JP2002190209A (en) * 2000-12-21 2002-07-05 Enplas Corp Surface light source apparatus and image display device
WO2004027314A1 (en) * 2002-09-19 2004-04-01 Matsushita Electric Industrial Co., Ltd. Illumination unit and liquid crystal display comprising it

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102865522A (en) * 2012-10-12 2013-01-09 深圳市华星光电技术有限公司 Backlight module
WO2014148362A1 (en) * 2013-03-19 2014-09-25 堺ディスプレイプロダクト株式会社 Backlight device, and display device
CN104520635A (en) * 2013-03-19 2015-04-15 堺显示器制品株式会社 Backlight device, and display device
JP2015176752A (en) * 2014-03-14 2015-10-05 日本精機株式会社 Lighting device and display device
JP2019125504A (en) * 2018-01-17 2019-07-25 オムロン株式会社 Surface light source device, display device and electronic equipment
WO2019142620A1 (en) * 2018-01-17 2019-07-25 オムロン株式会社 Surface light source device, display device, and electronic device
TWI693457B (en) * 2018-01-17 2020-05-11 日商歐姆龍股份有限公司 Surface light source device, display device and electronic device

Similar Documents

Publication Publication Date Title
RU2662034C1 (en) Display device
KR100859537B1 (en) Planar light source device
KR100852249B1 (en) Planar light source device
WO2012023322A1 (en) Illumination device, display device and television receiver
WO2012039196A1 (en) Lighting apparatus, display apparatus, and television receiver apparatus
US20140347620A1 (en) Display apparatus
WO2012081395A1 (en) Illumination device and liquid crystal display device comprising same
US20140043848A1 (en) Backlight device and display device including the same
KR20100060508A (en) Liquid crystal display module and display apparatus set having the same, and method of assembling the liquid crystal display module
US9016919B2 (en) Lighting device, display device and television receiver
WO2011093119A1 (en) Illuminating device, display device, and television receiver
JP5271649B2 (en) Liquid crystal display
CN106932961B (en) Liquid crystal display device having a plurality of pixel electrodes
TWI405009B (en) Liquid crystal display device
WO2012128193A1 (en) Lighting device and display device
WO2011067994A1 (en) Illumination device, display device, and television reception device
KR20140011104A (en) Backlight unit and liquid display device including the same
WO2012063917A1 (en) Illumination device and liquid crystal display device provided with same
JP2016143669A (en) Backlight unit and display device including the same
KR20120129092A (en) Liquid crystal display device
KR20110134706A (en) Backlight assembly and display apparatus comprising the same
KR101318437B1 (en) Back light unit for liquid crystal display
WO2012105118A1 (en) Lighting unit and liquid crystal display device equipped with same
JP2013182854A (en) Lighting device and display device with the same
JP2010107842A (en) Liquid crystal display device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11839869

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11839869

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP