WO2011089805A1 - 照明装置、表示装置およびテレビ受信装置 - Google Patents
照明装置、表示装置およびテレビ受信装置 Download PDFInfo
- Publication number
- WO2011089805A1 WO2011089805A1 PCT/JP2010/072773 JP2010072773W WO2011089805A1 WO 2011089805 A1 WO2011089805 A1 WO 2011089805A1 JP 2010072773 W JP2010072773 W JP 2010072773W WO 2011089805 A1 WO2011089805 A1 WO 2011089805A1
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- WIPO (PCT)
- Prior art keywords
- guide plate
- light
- light guide
- spacer member
- light source
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- 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
- G02B6/0091—Positioning aspects of the light source relative to the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light.
- a light guide plate having a light incident surface on a side surface, a light source arranged to face the light incident surface of the light guide plate, a light source is attached, and a part of the light source is disposed between the light source and the light guide plate.
- a backlight device is disclosed that includes a light source mount that is positioned and an elastic member that contacts the light source mount.
- the distance between the light source and the light guide plate is regulated by the light source mount when the light guide plate expands to the light source side due to heat at the time of light source emission, and the distance between the light guide plate and the light source. Is kept within a certain range. Thereby, the optical design of the backlight device is maintained. Further, the expansion of the light guide plate is absorbed by the elastic member through the light source mounting base.
- the distance between the light source and the light guide plate is regulated by a part of the light source mount, while the expansion of the light guide plate is absorbed by the elastic member. That is, a member for absorbing the expansion of the light guide plate is required separately from the member for regulating the distance between the light guide plate and the light source.
- An object of the present invention is to provide an illumination device that can maintain an optical design while absorbing the expansion of the light guide plate when the light guide plate expands toward the light source with a simple configuration.
- the technology disclosed in this specification has a light source substrate, a light source disposed on the surface of the light source substrate, and a flat plate shape, and has a light incident surface on each of the opposing side surfaces.
- a light guide plate arranged so that each of the light incident surfaces faces the light source of the light source substrate, and a spacer member for regulating a distance between the light source substrate and the light guide plate,
- the present invention relates to an illumination device in which each of the spacer members has a Young's modulus smaller than that of the light guide plate.
- each spacer member since the Young's modulus of each spacer member is smaller than the Young's modulus of the light guide plate, when the light guide plate expands toward the light source, the expansion of the light guide plate is absorbed by each spacer member. be able to. Further, when the light guide plate expands toward the light source side, the distance between the light source substrate and the light guide plate can be regulated by the spacer member on each side surface of the light guide plate facing the light source with an equal load. Thereby, it is possible to keep an equal distance between the light source and the light guide plate on each side surface of the light guide plate facing the light source.
- each spacer member plays the role which absorbs the expansion
- the Young's modulus of the spacer member disposed on one light incident surface side of the light guide plate and the spacer member disposed on the other light incident surface side facing the light incident surface may be a difference between the Young's modulus.
- a load due to the weight of the light guide plate may be applied only to the spacer member positioned below the light guide plate among the spacer members.
- the spacer member positioned on the lower side of the light guide plate is compressed, and the distance between the light guide plate and the light source on the lower side of the light guide plate is greater than the distance between the light guide plate and the light source on the upper side of the light guide plate. May be smaller.
- the Young's modulus of the spacer member located below the light guide plate is made larger than the Young's modulus of the spacer member located above the light guide plate. Can do.
- the light guide plate is supported without excessively compressing the spacer member located on the lower side of the light guide plate. can do.
- the distance between the light guide plate and the light source on the lower side of the light guide plate and the distance between the light guide plate and the light source on the upper side of the light guide plate can be kept equal, and the optical design of the lighting device is effective. Can be maintained.
- the spacer member may have a leaf spring having elasticity in a direction perpendicular to the light incident surface of the light guide plate. According to this configuration, when the light guide plate expands toward the light source side, the leaf spring of the spacer member is deformed in a direction perpendicular to the light incident surface of the light guide plate by the pressing force due to the expansion of the light guide plate. For this reason, the expansion of the light guide plate can be effectively absorbed by the spacer member.
- plate spring of the said spacer member distribute
- the elastic modulus of the leaf spring of the spacer member may be a difference between the elastic modulus of the leaf spring of the spacer member.
- a difference can be provided in the elastic modulus of each leaf spring.
- plate spring of the spacer member located below the light guide plate is made into the elasticity of the leaf
- the distance between the light guide plate and the light source on the lower side of the light guide plate and the distance between the light guide plate and the light source on the upper side of the light guide plate can be kept equal, and the optical design of the lighting device is effective. Can be maintained.
- the illumination device further includes a housing member that houses at least the light source substrate and the light guide plate, and the spacer member is disposed on a surface of the housing member positioned between the light source substrate and the light guide plate. And may be fixed to the housing member. According to this configuration, the spacer member can be stabilized by fixing the spacer member to the surface of the housing member.
- the illumination device may further include a substrate holding member that is fixed to the surface of the housing member and holds the light source substrate, and the spacer member may be disposed on the surface of the substrate holding member. According to this configuration, the spacer member can be fixed to the storage member while fixing the light source substrate to the surface of the storage member via the substrate holding member.
- the spacer member disposed on one light incident surface side of the light guide plate and the spacer member disposed on the light incident surface side facing the light incident surface are mirror-symmetrical. It may be formed in any shape. According to this configuration, the distance between the light source substrate and the light guide plate can be effectively regulated with an equal load on both opposite side surfaces of the light guide plate on which the spacer member is disposed. Thereby, isotropic expansion
- both may be in contact with each other without applying a load between the spacer member and the light guide plate under a temperature condition of 25 ° C.
- each spacer member can be kept in contact with the light guide plate without applying a load under a normal temperature (25 ° C.) temperature condition that facilitates designing for manufacturing.
- the distance between the light source substrate and the light guide plate is effectively regulated with an equal load on each side surface of the light guide plate on which the spacer member is arranged.
- swelling of a light-guide plate can be ensured and the optical design of an illuminating device can be maintained effectively.
- the light incident surface may have a longitudinal shape, and may further include a reflecting member disposed along the longitudinal direction of the light incident surface between the light source and the light guide plate. . According to this configuration, light scattered from the light source to the outside of the light guide plate can be incident on the light guide plate by the reflecting member. Thereby, it can suppress that light leaks out of a light-guide plate, and can improve the utilization efficiency of the light radiate
- the technology disclosed in this specification can also be expressed as a display device including a display panel that performs display using light from the above-described lighting device.
- a display device in which the display panel is a liquid crystal panel using liquid crystal is also new and useful.
- a television receiver provided with the above display device is also new and useful. According to the display device and the television set described above, the display area can be increased.
- the illumination device when the light guide plate expands toward the light source side with a simple configuration, the illumination device can maintain the optical design of the backlight device while absorbing the expansion of the light guide plate. Can be provided.
- FIG. 1 is an exploded perspective view of a television receiver TV according to a first embodiment.
- An exploded perspective view of the liquid crystal display device 10 is shown.
- a cross-sectional view of the liquid crystal display device 10 is shown.
- a schematic plan view of the backlight device 24 is shown.
- Sectional drawing of the liquid crystal display device 40 which concerns on 2nd Example is shown.
- the perspective view of the backlight apparatus 54 which concerns on 2nd Example is shown.
- Sectional drawing of the liquid crystal display device 70 which concerns on 3rd Example is shown.
- the perspective view which expanded some backlight apparatuses 84 concerning the 3rd example is shown.
- the disassembled perspective view of the liquid crystal display device 110 which concerns on 4th Example is shown.
- a cross-sectional view of the liquid crystal display device 110 is shown.
- each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn in a common direction in each drawing.
- the Y-axis direction coincides with the vertical direction
- the X-axis direction coincides with the horizontal direction.
- the vertical direction is used as a reference for upper and lower descriptions.
- FIG. 1 is an exploded perspective view of the television receiver TV according to the first embodiment.
- the television receiver TV includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, and a stand S. I have.
- FIG. 2 shows an exploded perspective view of the liquid crystal display device 10.
- the upper side shown in FIG. 2 is the front side, and the lower side is the back side.
- the liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 16 that is a display panel and a backlight device 24 that is an external light source, which form a frame shape. 12 and the like are integrally held.
- the liquid crystal panel 16 has a configuration in which a pair of transparent (highly translucent) glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal layer (not shown) is sealed between the glass substrates. Is done.
- One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- the substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film.
- image data and various control signals necessary for displaying an image are supplied to a source wiring, a gate wiring, a counter electrode, and the like from a drive circuit board (not shown).
- a polarizing plate (not shown) is disposed outside both glass substrates.
- the backlight device 24 includes a backlight chassis 22, an optical member 18, and a frame 14.
- the backlight chassis 22 has a substantially box shape opened to the front side (light emitting side, liquid crystal panel 16 side).
- the optical member 18 is disposed so as to cover the opening of the backlight chassis 22.
- the frame 14 has a frame shape and is disposed so as to surround the optical member 18.
- a pair of LED (Light) Emitting Diode) units 32 and a light guide plate 20 are accommodated.
- the pair of LED units 32 and 32 are respectively disposed on the outer edges of both long sides of the backlight chassis 22 and emit light.
- the light guide plate 20 is disposed between the pair of LED units 32 and 32 and guides light emitted from the LED unit 32 to the liquid crystal panel 16 side.
- An optical member 18 is placed on the front side of the light guide plate 20.
- the backlight device 24 includes the light guide plate 20 and the optical member 18 disposed immediately below the liquid crystal panel 16 and the LED unit 32 serving as a light source disposed on the side end of the light guide plate 20.
- a so-called edge light system (side light system) is adopted.
- the backlight chassis 22 is made of, for example, a metal such as an aluminum material, and has a bottom plate 22a having a rectangular shape in plan view, and side plates 22b and 22c that rise from the outer edges of both the long and short sides of the bottom plate 22a to the front side, respectively. , Is composed of.
- the bottom plate 22a has a long side direction that matches the horizontal direction (X-axis direction), and a short side direction that matches the vertical direction (Y-axis direction).
- a space between the pair of LED units 32 and 32 in the backlight chassis 22 is a housing space for the light guide plate 20.
- a power circuit board for supplying power to the LED unit 32 is attached to the back side of the bottom plate 22a.
- the optical member 18 is formed by laminating a diffusion plate 18a, a diffusion sheet 18b, a lens sheet 18c, and a reflective polarizing plate 18d in order from the light guide plate 20 side.
- the diffusion sheet 18b, the lens sheet 18c, and the reflective polarizing plate 18d have a function of converting light emitted from the LED unit 32 and passing through the diffusion plate 18a into planar light.
- a liquid crystal panel 16 is installed on the upper surface side of the reflective polarizing plate 18 d, and the optical member 18 is disposed between the light guide plate 20 and the liquid crystal panel 16.
- the LED unit 32 has a configuration in which an LED light source 28 that emits white light and a spacer member 25a (25b) are arranged in parallel in a row on a resin-made rectangular LED board 30.
- the spacer members 25a (25b) are arranged at regular intervals between the plurality of LED light sources 28.
- the spacer member 25a (25b) will be described in detail with reference to other drawings.
- the pair of LED units 32 and 32 are attached to the long side outer edge portions 22b and 22c of the backlight chassis 22 by, for example, screwing or the like, with the LED light source 28 and the spacer member 25a (25b) facing each other. Yes.
- the light guide plate 20 is a rectangular plate-like member, and is formed of a resin having high translucency (high transparency) such as acrylic. As shown in FIG. 2, the light guide plate 20 is disposed between the LED units 32 facing each other so that the main plate surface (light output surface) 20 b faces the diffusion plate 18 a. Further, a reflection sheet 26 is disposed on the surface 20c of the light guide plate 20 opposite to the surface facing the diffusion plate 18a. The reflection sheet 26 plays a role of returning light to the inside of the light guide plate 20 again by reflecting light leaked from the light guide plate 20.
- the light generated from the LED unit 32 is incident from the side plate surfaces (light incident surfaces) 20 a 1 and 20 a 2 of the light guide plate 20 and from the main plate surface facing the diffusion plate 18 a.
- the liquid crystal panel 16 is irradiated from the back side.
- FIG. 3 shows a cross-sectional view of the liquid crystal display device 10.
- the cross-sectional view of FIG. 3 shows a cross-sectional configuration of the liquid crystal display device 10 when viewed in cross section on the YZ plane passing through the spacer member 25a (25b).
- the spacer member 25 a (25 b) is disposed between the LED substrate 30 and the light guide plate 20.
- the spacer member 25 a (25 b) is fixed to the surface of the LED substrate 30 by being bonded to the surface of the LED substrate 30, for example.
- Each spacer member 25 a (25 b) is formed of a material having a Young's modulus smaller than that of the light guide plate 20.
- the spacer member 25a (25b) As a material for forming the spacer member 25a (25b), PC (polycarbonate), PBT (polybutylene terephthalate), silicon rubber, ABS (acrylonitrile butadiene styrene) resin, or the like can be used.
- PC polycarbonate
- PBT polybutylene terephthalate
- silicon rubber silicon rubber
- ABS acrylonitrile butadiene styrene resin, or the like
- the Young's modulus of these materials is generally smaller than the Young's modulus of the light guide plate 20.
- FIG. 4 shows a schematic plan view of the backlight device 24.
- the distance W1 between the LED substrate 30 and the light guide plate 20 is regulated by the spacer member 25a (25b), and the distance W1 between the LED light source 28 and the light guide plate 20 is in a certain range. Kept inside.
- the spacer member 25a disposed on one light incident surface 20a1 side of the light guide plate 20 and the spacer member 25b disposed on the light incident surface 20a2 side facing the light incident surface 20a1 are mirror-symmetrical. It is formed with.
- Each spacer member 25a (25b) has a height so as to contact the light incident surface 20a1 (20a2) of the light guide plate 20 without applying a load between the spacer members 25a (25b) and the light guide plate 20 under a temperature condition of 25 ° C. Has been prepared.
- the spacer member 25a (25b) is displaced in the vertical direction, the spacer member 25a (25b) is compressed, and the expansion of the light guide plate 20 is absorbed by the spacer member 25a (25b).
- the backlight device 24 (the liquid crystal display device 10) is incorporated as a part of the television receiver TV, and may be placed vertically after the television receiver TV is manufactured.
- Each spacer member 25a (25b) is located on the upper side and the lower side of the light guide plate 20 when the backlight device 24 is placed vertically.
- the spacer member 25a disposed on the one light incident surface 20a1 side of the light guide plate 20 is positioned on the lower side of the light guide plate 20 and disposed on the light incident surface 20a2 side facing the light incident surface 20a1.
- the spacer member 25b is located above the light guide plate 20.
- the spacer member 25 a located on the lower side of the light guide plate 20 is a material that forms the spacer member 25 b located on the upper side of the light guide plate 20. It is made of a material having a larger Young's modulus.
- each spacer member 25a (25b) is smaller than the Young's modulus of the light guide plate, when the light guide plate 20 expands toward the LED light source 28 side, Expansion of the light guide plate 20 can be absorbed by each spacer member 25a (25b). Further, when the light guide plate 20 expands toward the LED light source 28, the distance between the LED substrate 30 and the light guide plate 20 is set to the spacer member 25 a (on each side surface 20 a 1, 20 a 2 of the light guide plate 20 facing the LED light source 28. 25b) can be regulated with equal loads.
- each spacer member 25 a (25 b) plays a role of absorbing the expansion of the light guide plate 20 as well as the role of regulating the distance W ⁇ b> 1 between the LED light source 28 and the light guide plate 20.
- the backlight device 24 of the present embodiment it is not necessary to arrange a member for absorbing the expansion of the light guide plate 20 separately from the spacer member 25a (25b), and the light guide plate 20 is an LED with a simple configuration.
- the distance between the LED substrate 30 and the light guide plate 20 on each side surface of the light guide plate 20 facing the LED light source 28 is respectively set. Regulated with equal load. For this reason, isotropic expansion of the light guide plate 20 can be ensured.
- the spacer member 25 b positioned on the upper side of the light guide plate 20 has a Young's modulus of the spacer member 25 a positioned on the lower side of the light guide plate 20. Greater than Young's modulus. For this reason, even when a load due to the weight of the light guide plate 20 is applied only to the spacer member 25a located on the lower side of the light guide plate 20, the spacer member 25a located on the lower side of the light guide plate 20 is excessively compressed.
- the light guide plate 20 can be supported.
- the distance between the light guide plate 20 and the LED light source 28 on the lower side of the light guide plate 20 and the distance between the light guide plate 20 and the LED light source 28 on the upper side of the light guide plate 20 can be kept equal.
- the optical design of the backlight device 24 can be effectively maintained.
- the spacer member 25a (25b) disposed on the one light incident surface 20a1 side of the light guide plate 20 and the light incident surface 20a2 side facing the light incident surface 20a1 are disposed.
- the spacer member 25b (25a) is formed in a mirror-symmetric shape. For this reason, the distance between the LED substrate 30 and the light guide plate 20 can be effectively regulated with an equal load on the opposite side surfaces of the light guide plate 20 on which the spacer members 25a (25b) are arranged. . Thereby, isotropic expansion
- the spacer member 25a (25b) and the backlight chassis 24 are illustrated as separate members. However, the spacer member 25a (25b) and the backlight chassis 24 are integrally formed. Thus, the spacer member 25a (25b) may be a part of the backlight chassis 24.
- FIG. 5 shows a cross-sectional view of a liquid crystal display device 40 according to the second embodiment.
- the cross-sectional view of FIG. 5 shows a cross-sectional configuration when the liquid crystal display device 40 is viewed in cross section on the YZ plane passing through the spacer member 55a (55b).
- the configuration and arrangement of the spacer members 55a (55b) are different from those of the first embodiment.
- the other configurations are the same as those in the first embodiment, and in FIG. 5, the members obtained by adding the numeral 30 to the reference numerals in FIG. 3 are the same as the members described in the first embodiment. The description of the function and effect is omitted.
- the spacer member 55a (55b) has a leaf spring.
- the spacer member 55 a (55 b) having a leaf spring is fixed to the bottom plate 52 a of the backlight chassis 52 by, for example, bonding, and extends from the bottom plate 52 a of the backlight chassis 52 to the front side of the backlight device 54.
- the leaf spring of the spacer member 55a (55b) has a shape that curves so as to warp toward the light incident surface 50a1 (50a2) of the light guide plate 50, and thereby the light incident surface 50a1 (50a2) of the light guide plate 50. It has elasticity in the direction perpendicular to.
- the curved portion of the leaf spring of the spacer member 55a (55b) is in contact with the light incident surface 50a1 (50a2) of the light guide plate 50, whereby the light guide plate 50 is displaced toward the LED light source 58. It is regulated.
- galvanized steel, aluminum, stainless steel, or the like can be used as a material for forming the spacer member 55a (55b) having a leaf spring.
- FIG. 6 is a perspective view of the backlight device 54.
- the pair of LED units 62 and 62 and the backlight chassis 52 are shown transparent for explanation.
- the spacer members 55 a (55 b) are respectively disposed at both ends of the backlight chassis 52 in the long side direction. For this reason, the light emitted from the LED light source 58 to the light incident surface 50a1 (50a2) of the light guide plate 50 is not blocked by the spacer member 55a (55b).
- the elastic modulus of the leaf spring of the spacer member 55 a located on the lower side of the light guide plate 50 is the spacer located on the upper side of the light guide plate 50. It is smaller than the elastic modulus of the leaf spring of the member 55b.
- the shape of the leaf spring of the spacer member 55a located on the lower side of the light guide plate 50 is larger than the shape of the leaf spring of the spacer member 55b located on the upper side of the light guide plate 50.
- the degree of bending toward the light surface 50a1 (50a2) is small.
- the leaf spring of the spacer member 55a located on the lower side of the light guide plate 50 is replaced with the leaf spring of the spacer member 55b located on the upper side of the light guide plate 50.
- the light guide plate 50 is less likely to be deformed in a direction perpendicular to the light incident surface 50a1 (50a2).
- the spacer member 55a (55b) has a leaf spring having elasticity in a direction perpendicular to the light incident surface 50a1 (50a2) of the light guide plate 50. Therefore, when the light guide plate 50 expands to the LED light source 58 side, the leaf spring of the spacer member 55a (55b) is perpendicular to the light incident surface 50a1 (50a2) of the light guide plate 50 due to the pressing force due to the expansion of the light guide plate 50. Deform in the direction. For this reason, the expansion of the light guide plate 50 can be effectively absorbed by the spacer member 55a (55b).
- the elastic modulus of the leaf spring of the spacer member 55a located on the lower side of the light guide plate 50 is the light guide plate 50. Is smaller than the elastic modulus of the leaf spring of the spacer member 55b located on the upper side. For this reason, even when a load due to the weight of the light guide plate 50 is applied only to the spacer member 55a located below the light guide plate 50, the spacer member 55a located below the light guide plate 50 is excessively compressed. The light guide plate 50 can be supported.
- the distance between the light guide plate 50 and the LED light source 58 on the lower side of the light guide plate 50 and the distance between the light guide plate 50 and the LED light source 58 on the upper side of the light guide plate 50 can be kept equal.
- the optical design of the backlight device 54 can be effectively maintained.
- the spacer member 55a (55b) is disposed on the surface of the backlight chassis 52 located between the LED substrate 60 and the light guide plate 50. It is fixed. For this reason, the spacer member 55a (55b) can be stabilized.
- the mode in which the spacer member 55a (55b) is disposed on the surface of the backlight chassis 52 located between the LED substrate 58 and the light guide plate 50 is illustrated. It is good also as an aspect by which spacer member 55a (55b) was distribute
- FIG. 7 is a sectional view of a liquid crystal display device 70 according to the third embodiment.
- the cross-sectional view of FIG. 7 shows a cross-sectional configuration of the liquid crystal display device 70 as viewed in cross section on the YZ plane passing through the spacer member 85a (85b).
- the third embodiment is different from that of the first embodiment in that the liquid crystal display device 70 includes a substrate holding member 87 and the form and arrangement of the spacer members 85a (85b).
- the other configurations are the same as those in the first embodiment, and in FIG. 7, the members obtained by adding the numeral 60 to the reference numerals in FIG. 3 are the same as the members described in the first embodiment. The description of the function and effect is omitted.
- the liquid crystal display device 70 includes a substrate holding member 87.
- the substrate holding member 87 has an inverted L-shaped cross section, and is fixed to the side plates 82b and 82c of the backlight chassis 82 located above the LED substrate 90.
- the LED substrate 90 is incident on the light guide plate 80. It is held in a direction perpendicular to the surface 80a1 (80a2).
- the spacer member 85a (85b) is fixed to the surface of the substrate holding member 87 by, for example, bonding.
- the spacer member 85a (85b) has a handle shape that is curved in an approximately annular shape. The curved portion of the spacer member 85a (85b) is in contact with the light incident surface 80a1 (80a2) of the light guide plate 80, thereby restricting the displacement of the light guide plate 80 toward the LED light source 88.
- FIG. 8 shows an enlarged perspective view of a part of the backlight device 84.
- the light guide plate 80 and the backlight chassis 82 are shown transparent for explanation.
- the substrate holding member 87 and the spacer member 85a (85b) are respectively disposed at both ends of the backlight chassis 82 in the long side direction. For this reason, the light emitted from the LED light source 88 to the light incident surface 80a1 (80a2) of the light guide plate 50 is not blocked by the spacer member 85a (85b).
- the spacer member 85a (85b) is disposed on the surface of the substrate holding member 87 that holds the LED substrate 90. Therefore, the spacer member 85a (85b) can be fixed to the backlight device 84 while the LED substrate 90 is fixed to the surface of the backlight device 84 via the substrate holding member 87.
- the light source holding member 87 and the spacer member 85a (85b) are illustrated as separate members. However, the spacer member 85a (85b) and the light source holding member 87 are integrally formed. Thus, the spacer member 85a (85b) may be a part of the light source holding member 87.
- FIG. 9 is an exploded perspective view of the liquid crystal display device 110 according to the fourth embodiment.
- the upper side shown in FIG. 9 is the front side, and the lower side is the back side.
- the liquid crystal display device 110 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 116 as a display panel and a backlight device 124 as an external light source.
- the bezel 112b, the side bezel 112c (hereinafter referred to as the bezel groups 112a to 112c) and the like are integrally held.
- the configuration of the liquid crystal panel 116 is the same as that of the first embodiment, and thus the description thereof is omitted.
- the backlight device 124 includes a backlight chassis 122, an optical member 118, a top frame 114a, a bottom frame 114b, a side frame 114c (hereinafter referred to as frame groups 114a to 114c), And a reflection sheet 126.
- the liquid crystal panel 116 is sandwiched between the bezel groups 112a to 112c and the frame groups 114a to 114c.
- Reference numeral 113 denotes an insulating sheet for insulating the drive circuit board 115 (see FIG. 10) for driving the liquid crystal panel 116.
- the backlight chassis 122 is open to the front side (light emitting side, liquid crystal panel 116 side) and has a substantially box shape having a bottom surface.
- the optical member 118 is disposed on the front side of the light guide plate 120.
- the reflection sheet 126 is disposed on the back side of the light guide plate 120.
- a pair of cable holders 131, 131, a pair of heat sinks 119, 119 extending in the long side direction of the backlight chassis 122, and a long side direction of the backlight chassis 122 are extended.
- a pair of LED units 132 and 132 in which a spacer member 125 (see FIG. 10) is disposed and the light guide plate 120 are accommodated.
- the LED unit 132, the light guide plate 120, and the reflection sheet 126 are supported by a rubber bush 133.
- a power circuit board (not shown) for supplying power to the LED unit 132, a protective cover 123 for protecting the power circuit board, and the like are attached.
- the pair of cable holders 131, 131 are arranged along the short side direction of the backlight chassis 122 and accommodate wiring that electrically connects the LED unit 132 and the power supply circuit board.
- FIG. 10 shows a cross-sectional view of the backlight device 124.
- the cross-sectional view of FIG. 10 shows a cross-sectional configuration of the liquid crystal display device 110 when viewed in cross section on a YZ plane passing through the spacer member 125.
- the backlight chassis 122 includes a bottom plate 122a having a bottom surface 122z and side plates 122b and 122c that rise shallowly from the outer edge of the bottom plate 122a, and support at least the LED unit 132 and the light guide plate 120.
- the heat sink 119 has an L-shaped cross section composed of a bottom surface portion 119a and a side surface portion 119b rising from one long side outer edge of the bottom surface portion 119a.
- the light chassis 122 is arranged along one long side direction.
- a bottom surface portion 119 a of the heat radiating plate 119 is fixed to the bottom plate 122 a of the backlight chassis 122. Therefore, the LED unit 132 is supported on the bottom plate 122 a of the backlight chassis 122 via the heat radiating plate 119.
- the heat radiating plate 119 radiates heat generated in the LED unit 132 to the outside of the backlight device 124 via the bottom plate 122 a of the backlight chassis 122.
- the light guide plate 120 is disposed between the pair of LED units 132 and 132.
- the light guide plate 120 and the optical member 118 are sandwiched between the frame groups 114 a to 114 c and the backlight chassis 122.
- a drive circuit board 115 is disposed on the front side of the bottom frame 114b.
- the drive circuit board 115 is electrically connected to the display panel 116 and supplies the liquid crystal panel 116 with image data and various control signals necessary for displaying an image.
- the reflecting members 134a are arranged along the long side direction of the light incident surface 120a1 (120a2) of the light guide plate 120, respectively. Has been.
- the reflecting member 134b is disposed along the long side direction of the light incident surface 120a1 (120a2) of the light guide plate 120.
- the reflecting member 134a is arranged on the surfaces of the top frame 114a and the bottom frame 114b.
- a reflective member 134 b is disposed on the surface of the backlight chassis 122.
- the LED light sources 28, 58, and 88 are examples of “light sources”.
- the LED boards 30, 60, 90, and 130 are examples of the “light source board”.
- the backlight devices 24, 54, 84, and 124 are examples of “illumination devices”.
- the liquid crystal display devices 10, 40, 70, and 110 are examples of the “display device”.
- the backlight chassis 22, 52, 82, 122 are examples of “accommodating members”.
- the LED light sources are arranged on the two opposite side surfaces of the light guide plate.
- the LED light sources are arranged on the three side surfaces of the light guide plate. It is good also as a structure, or it is good also as a structure by which the LED light source was distribute
- the spacer member is bonded to the LED substrate and the like, and the method for fixing the spacer member is not limited.
- the spacer member may be fixed to the surface of the LED substrate by being screwed through the LED substrate and the backlight chassis.
- a liquid crystal display device using a liquid crystal panel as the display panel has been exemplified.
- the present invention can also be applied to display devices using other types of display panels.
- the television receiver provided with the tuner has been exemplified.
- the present invention can also be applied to a display device that does not include the tuner.
- TV TV receiver, Ca, Cb: cabinet, T: tuner, S: stand, 10, 110: liquid crystal display device, 12: bezel, 14: frame, 16, 116: liquid crystal panel, 18, 118, optical member, 18a: diffusion plate, 18b: diffusion sheet, 18c: lens sheet, 18d: reflective polarizing plate, 20, 50, 80, 120: light guide plate, 20a1, 20a2, 50a1, 50a2, 80a1, 80a2, 120a1, 120a2: ON Light surface, 20b, 50b, 80b: Light exit surface, 20c, 50c, 80c: Surface opposite to light exit surface, 22, 52, 82, 122: Backlight chassis, 22a, 52a, 82a, 122a: Bottom plate, 24 54, 84, 124: Backlight device, 25a, 25b, 55a, 55b, 85a, 85b, 125: Space Member, 26, 56, 86, 126: reflection sheet, 28, 58, 88: LED light source, 30, 60, 90, 130: LED substrate, 32, 62,
Abstract
Description
特許文献1のバックライト装置では、光源と導光板との間の距離が光源取付台の一部によって規制される一方で、導光板の膨張が弾性部材によって吸収される。即ち、導光板と光源との間の距離を規制するための部材とは別に、導光板の膨張を吸収させるための部材が必要とされる。
本明細書で開示される技術は、光源基板と、前記光源基板の表面に配されている光源と、平板状をなしており、その側面のうち対向する側面の各々に入光面を有し、当該入光面の各々が前記光源基板の前記光源とそれぞれ対向するように配されている導光板と、前記光源基板と前記導光板との間の距離を規制するスペーサ部材と、を備え、前記スペーサ部材の各々のヤング率が前記導光板のヤング率よりも小さい照明装置に関する。
本明細書で開示される技術によると、簡単な構成で、導光板が光源側へ膨張する場合に、導光板の膨張を吸収させながら、バックライト装置の光学設計を維持することができる照明装置を提供することができる。
図面を参照して実施例を説明する。なお、各図面の一部にはX軸、Y軸およびZ軸を示しており、各軸方向が各図面で共通した方向となるように描かれている。このうちY軸方向は、鉛直方向と一致し、X軸方向は、水平方向と一致している。また、特に断りがない限りは、上下の記載については鉛直方向を基準とする。
図5に、第2実施例に係る液晶表示装置40の断面図を示す。図5の断面図は、液晶表示装置40を、スペーサ部材55a(55b)を通過するYZ平面で断面視したときの断面構成を示している。第2実施例は、スペーサ部材55a(55b)の形態および配置が、第1実施例のものと異なっている。その他の構成については上記の第1実施例と同じであり、図5において、図3の参照符号に数字30を加えた部材は、第1実施例で説明した部材と同一であるため、構造、作用、および効果の説明は省略する。
図7に、第3実施例に係る液晶表示装置70の断面図を示す。図7の断面図は、液晶表示装置70を、スペーサ部材85a(85b)を通過するYZ平面で断面視したときの断面構成を示している。第3実施例は、液晶表示装置70が基板保持部材87を備えている点およびスペーサ部材85a(85b)の形態や配置が、第1実施例のものと異なっている。その他の構成については上記の第1実施例と同じであり、図7において、図3の参照符号に数字60を加えた部材は、第1実施例で説明した部材と同一であるため、構造、作用、および効果の説明は省略する。
図9に、第4実施例に係る液晶表示装置110の分解斜視図を示す。ここで、図9に示す上側を表側とし、同図下側を裏側とする。図9に示すように、液晶表示装置110は、全体として横長の方形を成し、表示パネルである液晶パネル116と、外部光源であるバックライト装置124とを備え、これらがトップベゼル112a、ボトムベゼル112b、サイドベゼル112c(以下、ベゼル群112a~112cと称する)等により一体的に保持されるようになっている。なお、液晶パネル116の構成については、第1実施例のものと同様の構成であるため、説明を省略する。
(1)上記の各実施例では、白色発光するLED光源が実装された構成を採用しているが、例えば赤色、緑色、青色の3種類のLED光源が面実装された構成としてもよく、あるいは青色のLED光源と黄色蛍光体とを組み合わせた構成としてもよい。
Claims (12)
- 光源基板と、
前記光源基板の表面に配されている光源と、
平板状をなしており、その側面のうち対向する側面の各々に入光面を有し、当該入光面の各々が前記光源基板の前記光源とそれぞれ対向するように配されている導光板と、
前記光源基板と前記導光板との間の距離を規制するスペーサ部材と、を備え、
前記スペーサ部材の各々のヤング率が前記導光板のヤング率よりも小さいことを特徴とする照明装置。 - 前記導光板の一方の入光面側に配されている前記スペーサ部材のヤング率と、当該入光面に対向する他方の入光面側に配されている前記スペーサ部材のヤング率との間に差があることを特徴とする請求項1に記載の照明装置。
- 前記スペーサ部材は、前記導光板の前記入光面に垂直な方向に弾性を有する板バネを有していることを特徴とする請求項1又は請求項2に記載の照明装置。
- 前記導光板の一方の入光面側に配されている前記スペーサ部材の前記板バネの弾性率と、当該入光面に対向する入光面側に配されている前記スペーサ部材の前記板バネの弾性率との間に差があることを特徴とする請求項3に記載の照明装置。
- 少なくとも前記光源基板と前記導光板とを収容する収容部材、をさらに備え、
前記スペーサ部材が、前記光源基板と前記導光板との間に位置する前記収容部材の表面に配置され、当該収容部材に固定されていることを特徴とする請求項1から請求項4のいずれか1項に記載の照明装置。 - 前記収容部材の表面に固定されていると共に前記光源基板を保持する基板保持部材をさらに備え、
前記スペーサ部材は、前記基板保持部材の表面に配されていることを特徴とする請求項5に記載の照明装置。 - 前記導光板の一方の入光面側に配されている前記スペーサ部材と、当該入光面に対向する入光面側に配されている前記スペーサ部材と、が鏡面対称な形状で形成されていることを特徴とする請求項1から請求項6のいずれか1項に記載の照明装置。
- 25℃の温度条件下において、前記スペーサ部材と前記導光板との間に荷重が加わることなく両者が当接していることを特徴とする請求項1から請求項7のいずれか1項に記載の照明装置。
- 前記入光面は長手状であり、
前記光源と前記導光板との間に、前記入光面の長手方向に沿って配されている反射部材をさらに備えることを特徴とする請求項1から請求項8のいずれか1項に記載の照明装置。 - 請求項1から請求項9のいずれか1項に記載の照明装置からの光を利用して表示を行う表示パネルを備えることを特徴とする表示装置。
- 前記表示パネルが液晶を用いた液晶パネルであることを特徴とする請求項10に記載の表示装置。
- 請求項10又は請求項11に記載の表示装置を備えることを特徴とするテレビ受信装置。
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JP2011550811A JP5303660B2 (ja) | 2010-01-22 | 2010-12-17 | 照明装置、表示装置およびテレビ受信装置 |
CN201080061376.3A CN102713411B (zh) | 2010-01-22 | 2010-12-17 | 照明装置、显示装置以及电视接收装置 |
US13/522,614 US8870437B2 (en) | 2010-01-22 | 2010-12-17 | Lighting device, display device, and television receiver |
EP10843969.6A EP2527718A4 (en) | 2010-01-22 | 2010-12-17 | LIGHTING DEVICE, DISPLAY DEVICE AND TELEVISION RECEIVER |
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Also Published As
Publication number | Publication date |
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JPWO2011089805A1 (ja) | 2013-05-23 |
CN102713411A (zh) | 2012-10-03 |
US20120293727A1 (en) | 2012-11-22 |
CN102713411B (zh) | 2015-01-21 |
US8870437B2 (en) | 2014-10-28 |
EP2527718A4 (en) | 2014-03-19 |
JP5303660B2 (ja) | 2013-10-02 |
EP2527718A1 (en) | 2012-11-28 |
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