WO2016009561A1 - 光源装置及び表示装置 - Google Patents
光源装置及び表示装置 Download PDFInfo
- Publication number
- WO2016009561A1 WO2016009561A1 PCT/JP2014/069228 JP2014069228W WO2016009561A1 WO 2016009561 A1 WO2016009561 A1 WO 2016009561A1 JP 2014069228 W JP2014069228 W JP 2014069228W WO 2016009561 A1 WO2016009561 A1 WO 2016009561A1
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- WIPO (PCT)
- Prior art keywords
- light
- peripheral wall
- guide plate
- light guide
- source device
- Prior art date
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- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- 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
- G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
-
- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- 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 display device using a liquid crystal panel, and relates to a light source device capable of maintaining good display quality and a display device including the light source device.
- an edge light type light source device is frequently used to reduce the thickness of the display device.
- an edge light type light source device light emitting diodes are arranged opposite to each other at a predetermined interval on one or a plurality of side surfaces of a light guide plate having a wide surface facing a liquid crystal panel, and light that has entered the light guide plate from the light emitting diodes.
- the liquid crystal panel is uniformly irradiated from the one wide surface.
- a light emitting diode used in an edge light type light source device has a structure called a surface mount type, and a group of wires such as a light emitting diode element and an electrode on a bottom surface of a deep dish-shaped container in which a reflection member is arranged on an inner surface. And a container is filled with a jelly-like phosphor.
- the light emitting diode element and the wiring group are connected with a loosened wire, and even if a positional deviation occurs between the members due to the difference in thermal expansion coefficient of each member such as the container, the light emitting diode element, and the electrode. , So as not to disturb the light emission.
- the light incident surface Since the light from the light emitting diode is emitted radially from the surface of the phosphor, there is a light flux that deviates to both wide surfaces without entering the side surface (hereinafter referred to as the light incident surface) of the light guide plate. As the distance between the surface of the phosphor and the light incident surface of the light guide plate increases, the loss of light increases, so in terms of light incident efficiency to the light guide plate, the light incident on the surface of the phosphor and the light guide plate. A configuration in which the surface is as close as possible is preferable. However, the light guide plate may come into contact with the container when vibration or impact is applied to the light source device itself or when the light guide plate is thermally expanded due to heat generated by the light emitting diode element.
- Patent Document 1 discloses a configuration in which a spacer is provided so as to surround the light emitting diode, thereby further preventing contact of the light guide plate with the light emitting diode.
- the spacer provided between the light guide plate and the light emitting diode has a space for the thermal expansion in view of the thermal expansion of the light guide plate. There is a gap between them.
- the present invention has been made in view of such circumstances, and a light source device capable of reducing the amount of light deviating from a light incident surface of a light guide plate in an edge light type light source device and maintaining a good display quality, and the light source device
- An object is to provide a display device using a light source device.
- a light source device includes a rectangular light guide plate and a strip-shaped substrate on which a plurality of light emitting diodes are mounted on one surface facing a side surface of the light guide plate.
- a peripheral wall made of an elastic body whose side surface is light-reflective is provided so as to surround each of the plurality of light emitting diodes, and the height of the peripheral wall is equal to or greater than a facing distance between the light guide plate and the substrate. It is characterized by that.
- the light source device is characterized in that the peripheral wall is thinner at the tip than at the base, and the tip is curved outward.
- the light source device is characterized in that an inner side surface of the peripheral wall facing the light guide plate in a thickness direction is in contact with an edge of the light guide plate on a light emitting diode side.
- the light source device further includes another peripheral wall arranged side by side inside the peripheral wall, and the other peripheral wall has an inner surface having light reflectivity, is harder than the peripheral wall, and has a height. Is lower than the peripheral wall and higher than the light emitting diode.
- the light source device is characterized in that the other peripheral wall is integrated with an element that constitutes the light emitting diode and a housing that houses a phosphor.
- the light source device according to the present invention is characterized in that a groove is provided between the container and another peripheral wall.
- the light source device is characterized in that at least an inner surface of the other peripheral wall is a white material or a mirror surface material.
- the light source device according to the present invention is characterized in that the peripheral wall is made of silicon rubber.
- a spacer that is harder than the peripheral wall is provided between the plurality of light emitting diodes on the substrate, and the height of the spacer is higher than the light emitting diode and lower than the peripheral wall. It is characterized by.
- a display device includes a liquid crystal panel and any one of the light source devices according to the above-described invention.
- a peripheral wall having a height not less than the facing distance between the light incident surface of the light guide plate and the substrate is provided so as to surround each of the plurality of light emitting diodes. Since at least the inner side surface of the peripheral wall has light reflectivity, light emitted from the light emitting diode enters the inside from the light incident surface of the light guide plate without leakage. Further, since the peripheral wall is made of an elastic body, the thermal expansion of the light guide plate is not hindered by the peripheral wall.
- the peripheral wall may have a simple configuration such as a rectangular tube shape or a cylindrical shape whose thickness does not change from the base portion toward the tip portion. In this case, the height of the peripheral wall and the hardness of the material used for the peripheral wall are appropriately designed so that the phosphor surface of the internal light emitting diode does not become higher than the peripheral wall when the peripheral wall contracts most in the height direction. Good.
- the peripheral wall has a thin wall shape from the base portion toward the tip portion on the light incident surface side of the light guide plate, and the tip portion is warped outward (curved shape). As a result, light shielding due to the fall of the peripheral wall on the light-emitting diode receiving the force from the light guide plate is prevented.
- two opposing inner side surfaces of the peripheral wall are in contact with the edge of the light guide plate so as to sandwich the light guide plate in the thickness direction.
- the peripheral wall need not support the light guide plate.
- another peripheral wall that is harder than the peripheral wall is provided on the inner periphery of the peripheral wall. This prevents falling into the inside of the peripheral wall.
- the height of the other peripheral wall is lower than the peripheral wall and higher than the light emitting diode.
- the other peripheral walls are harder than the peripheral walls.
- the entire light guide plate is closer to the light-emitting diodes than the configuration in which spacers are provided between the plurality of light-emitting diodes. It becomes possible.
- the other peripheral wall provided on the inner periphery of the peripheral wall is also used as a housing for housing the light emitting diode element and the phosphor, and can be integrally molded.
- a groove having a depth substantially equal to the depth of the container is provided between the portion corresponding to the other peripheral wall and the portion corresponding to the container. There should be. Thereby, even when a force is applied from the light guide plate to another peripheral wall portion configured integrally with the container, the force from the light guide plate is absorbed by the deformation of the other peripheral wall portion and is applied to the container. Power is eased.
- the entire inner surface of the other peripheral wall or the whole including the inner surface is made of a highly reflective material such as a white material or a mirror material.
- the light emitted from the phosphor surface is reflected by the inner surface of the other peripheral wall and efficiently guided to the light incident surface of the light guide plate.
- the peripheral wall is made of an elastic material having some elasticity such as silicon rubber. Even when the light incident surface of the light guide plate is not in contact with the light emitting diode only by contraction of the peripheral wall, it is possible to prevent the peripheral wall from falling into the light emitting diode by using a waisted material.
- a spacer provided between each of the plurality of light emitting diodes that has been adopted in the conventional light source device may be used in combination.
- the spacer is made of a material harder than the peripheral wall, and the height of the spacer is higher than that of the light emitting diode and lower than that of the peripheral wall.
- the present invention while preventing the light guide plate from contacting the light emitting diode, the amount of light deviating from the light incident surface of the light guide plate is reduced, and the display quality in the display device using the light guide plate is kept good. Can do.
- FIG. 2 is a schematic perspective view showing an enlarged part of the light source device in the first embodiment.
- 2 is a schematic cross-sectional view of a part of the light source device in Embodiment 1.
- FIG. 3 is a longitudinal sectional view taken along line AA ′ in FIG. 2.
- FIG. 6 is a schematic longitudinal sectional view of a part of a light source device according to Modification 1 of Embodiment 1.
- FIG. 6 is a schematic longitudinal sectional view of a part of a light source device according to Modification 2 of Embodiment 1.
- FIG. 6 is a schematic cross-sectional view of a part of the light source device in Modification 3 of Embodiment 1.
- FIG. 6 is a schematic perspective view showing an enlarged part of a light source device in a second embodiment.
- 6 is a schematic cross-sectional view of a part of the light source device according to Embodiment 2.
- FIG. 9 is a longitudinal sectional view taken along line BB ′ of FIG.
- FIG. 6 is a schematic longitudinal sectional view of a part of a light source device according to Modification 1 of Embodiment 2.
- FIG. 6 is a schematic longitudinal sectional view of a part of a light source device according to a second modification of the second embodiment.
- FIG. 10 is a schematic cross-sectional view of a part of the light source device in Modification 3 of Embodiment 2.
- FIG. 6 is a schematic cross-sectional view of a part of the light source device according to Embodiment 3.
- FIG. FIG. 14 is a longitudinal sectional view taken along line CC ′ of FIG. 13.
- FIG. 14 is an enlarged view of FIG. 13.
- 6 is a schematic cross-sectional view of a part of the light source device in Embodiment 4.
- FIG. 14 is a schematic cross-sectional view of a part of the light source device according to Embodiment 3.
- FIG. FIG. 14 is a longitudinal sectional view taken along line CC ′ of FIG. 13.
- FIG. 14 is an enlarged view of FIG. 13.
- 6 is a schematic cross-sectional view of a part of the light source device in Embodiment 4.
- FIG. 1 is a schematic perspective view showing a part of the light source device in Embodiment 1 in an enlarged manner.
- the light source device includes a light guide plate 1, a light emitting diode 2, and a substrate 3.
- the light guide plate 1 is a rectangular transparent plate made of acrylic resin.
- the thickness of the light guide plate 1 is, for example, 3 to 5 mm.
- the light emitting diode 2 is a package of a diode element that emits blue or ultraviolet light, a phosphor that covers the surface of the element, and a container that accommodates the phosphor.
- the outer shape of the light emitting diode 2 is a flat rectangular parallelepiped, and the length of the outer shape in the short direction is slightly smaller than the thickness of the light guide plate 1.
- the substrate 3 is a strip-shaped plate, and the width is a little wider than the thickness of the light guide plate 1.
- a plurality of light emitting diodes 2 are mounted on one surface of the substrate 3 so that the longitudinal direction of the plurality of light emitting diodes 2 is along the longitudinal direction of the substrate 3, and a circuit for controlling the lighting of these light emitting diodes 21 is formed.
- the substrate 3 is provided with a peripheral wall 41 surrounding each of the plurality of light emitting diodes 2 arranged side by side.
- the peripheral wall 41 in the first embodiment has a rectangular tube shape, and one end face is bonded to the substrate 3.
- the distance between the opposing surfaces in the short direction of the inner peripheral surface of the peripheral wall 41 is slightly smaller than the thickness of the light guide plate 1.
- the peripheral wall 41 is made of a material having light reflectivity and elasticity and made of, for example, solid white silicon rubber.
- an elastic body such as a foamed resin may be used.
- the height and hardness of the peripheral wall 41 are designed so as not to be lower than the height of the outer shape of the light emitting diode 2 when contracted most in the height direction.
- the mounting surface of the light emitting diode 2 is directed to the side surface (light incident surface) on the long side of the light guide plate 1, and the edge of the peripheral wall 41 is in close contact with the side surface. Arranged.
- FIG. 2 is a schematic cross-sectional view of a part of the light source device according to Embodiment 1
- FIG. 3 is a vertical cross-sectional view taken along the line AA ′ of FIG.
- the height of the peripheral wall 41 is equal to or slightly larger than the facing distance between the light incident surface of the light guide plate 1 and the substrate 3.
- the height and hardness of the peripheral wall 41 are such that the contact state between the edge surface of the peripheral wall 41 and the light guide plate can be maintained even when the facing distance between the light guide plate 1 and the substrate 3 is increased. is there.
- the peripheral wall 41 is provided so as to be in contact with the light incident surface of the light guide plate 1 without a gap, the light emitted from the light emitting diode 2 is incident on the light incident surface of the light guide plate 1. Enter without leaking. Thereby, the display quality of the display device using the light source device of Embodiment 1 as a light source for the liquid crystal panel can be kept good.
- the peripheral wall 41 is flexible, even if a force is applied from the light guide plate 1 and contracts, the light-emitting diode 2 is designed not to protrude from the peripheral wall 41, so that the thermal expansion of the light guide plate 41 is not hindered. It is possible to prevent the light guide plate 1 from contacting the light emitting diode 2.
- FIG. 4 is a schematic longitudinal sectional view of a part of the light source device according to the first modification of the first embodiment.
- the length of the outer shape of the light emitting diode 2 in the short direction is substantially equal to the thickness of the light guide plate 1.
- the thickness of the peripheral wall 41 in the modified example 1 is expanded inward at the tip. Note that the thickness may be increased by deformation of the tip of the peripheral wall 41. That is, the distance between the opposing surfaces in the short direction of the inner peripheral surface of the peripheral wall 41 is substantially equal to the thickness of the light guide plate 1 on the substrate 3 side, but is smaller than the thickness of the light guide plate 1 at the tip.
- the configuration other than the thickness in the short direction of the peripheral wall 41 is the same as that of the first embodiment.
- the peripheral wall 41 contracts in the height direction as shown in FIG. The surface tilts inward.
- the light incident surface of the light guide plate 1 and the peripheral wall 41 are kept in contact with no gap, the light emitted from the light emitting diode 2 enters the light incident surface of the light guide plate 1 without leaking. To do. Thereby, the display quality of the display device using the light source device of Embodiment 1 as a light source for the liquid crystal panel can be kept good.
- FIG. 5 is a schematic longitudinal sectional view of a part of the light source device according to the second modification of the first embodiment.
- the length in the short direction of the outer shape of the light emitting diode 2 is substantially equal to the thickness of the light guide plate 1, and a part of the peripheral wall 41 is in contact with the light incident surface of the light guide plate 1.
- the height of the peripheral wall 41 is slightly larger than the facing distance between the light incident surface of the light guide plate 1 and the substrate 3, as shown in FIG. Only the abutting part contracts, and a part of the longitudinal direction is shaped so as to grip the light guide plate 1 without contracting. At this time, since the light incident surface of the light guide plate 1 and the peripheral wall 41 are kept in contact with no gap, the light emitted from the light emitting diode 2 enters the light incident surface of the light guide plate 1 without leaking. To do. Thereby, the display quality of the display device using the light source device of Embodiment 1 as a light source for the liquid crystal panel can be kept good.
- FIG. 6 is a schematic cross-sectional view of a part of the light source device in Modification 3 of Embodiment 1.
- the substrate 3 is provided with the peripheral wall 41 described above, and a spacer 5 is provided at a substantially intermediate position between the plurality of light emitting diodes 2.
- the height of the spacer 5 is higher than that of the light emitting diode 2 and lower than that of the peripheral wall 41. Further, the spacer 5 is harder than the peripheral wall 41.
- the displacement is absorbed by the deformation of the peripheral wall 41 when the light guide plate 1 is thermally expanded and displaced.
- the light guide plate 1 hits the spacer 5. Therefore, it is possible to more reliably prevent the light guide plate 1 from contacting the light emitting diode 2.
- FIG. 7 is a schematic perspective view showing a part of the light source device in Embodiment 2 in an enlarged manner.
- the light source device in the second embodiment is the same as that in the first embodiment except for the configuration of the peripheral wall. Therefore, in the following description, the same reference numerals are given to configurations common to the first embodiment, and detailed description is omitted.
- the substrate 3 is provided with a peripheral wall 42 surrounding each of the plurality of light emitting diodes 2 arranged in parallel.
- the peripheral wall 42 includes four tongue pieces bonded to the substrate 3 along the side walls of the light emitting diode 2.
- Each tongue piece of the peripheral wall 42 is tapered toward the tip, and the tip of each tongue piece has a curved shape (curved shape) bent outwardly around the light emitting diode 2.
- the peripheral wall 42 is made of a material having light reflectivity and elasticity and made of, for example, solid white silicon rubber.
- an elastic body such as foamed resin may be used, but it is desirable that the elastic body has a certain degree of elasticity.
- FIG. 8 is a schematic cross-sectional view of a part of the light source device according to Embodiment 2
- FIG. 9 is a vertical cross-sectional view taken along the line BB ′ of FIG.
- the substrate 3 is arranged with respect to the light guide plate 1 with the mounting surface of the light emitting diode 2 facing the light incident surface on the long side of the light guide plate 1.
- two pieces facing the short direction of the substrate 3 abut so as to hold the light guide plate 1 inward as shown in FIG.
- the two pieces facing each other are arranged such that the tip ends are in close contact with the light incident surface of the light guide plate 1.
- each tongue piece of the peripheral wall 42 is larger than the facing distance between the light guide plate 1 and the substrate 3.
- the two pieces facing the short direction of the substrate 3 each have a tip. Projecting to the wide surface side of the light guide plate 1. Note that the two pieces of the peripheral wall 42 facing the short direction of the substrate 3 do not support the light guide plate 1, but the inner side simply contacts the edge of the light guide plate 1.
- the peripheral wall 42 is provided so as to largely fill the space between the opposing surfaces of the substrate 3 and the light guide plate 1, and the space in the peripheral wall 42 is expanded toward the light guide plate 1. Yes. Therefore, most of the light emitted from the light emitting diode 2 enters the inside from the light incident surface of the light guide plate 1. Further, since the tip of the peripheral wall 42 is tapered and is bent outward with the light emitting diode 2 as the center, the abutting light guide plate 1 is thermally expanded and displaced toward the light emitting diode 2. Even when a force is applied to the peripheral wall 42, the possibility that the peripheral wall 42 will fall to the light emitting diode 2 side is extremely low, and thus light shielding due to the fall of the peripheral wall 42 can be prevented.
- the second embodiment it is possible to prevent the light guide plate 1 from contacting the light emitting diode 2 without hindering the thermal expansion of the light guide plate 1. Thereby, the display quality of the display device using the light source device of Embodiment 2 as a light source for the liquid crystal panel can be kept good.
- FIG. 10 is a schematic longitudinal sectional view of a part of the light source device according to the first modification of the second embodiment.
- the length of the outer shape of the light emitting diode 2 in the short direction is smaller than the thickness of the light guide plate 1.
- the two pieces of the peripheral wall 42 facing in the short direction are provided with a gap with respect to the side wall of the light emitting diode 2 as shown in FIG. It is provided so as to be slightly smaller than the thickness of 1, and the two tip portions are in contact with each other so as to hold the light guide plate 1 inward.
- Other configurations are the same as those of the second embodiment.
- the light incident surface of the light guide plate 1 and the peripheral wall 42 are kept in contact with each other even if the light guide plate 1 is thermally expanded. It is possible to enter the inside from the light incident surface of the light guide plate 1 and prevent the light guide plate 1 from contacting the light emitting diode 2 without disturbing the thermal expansion of the light guide plate 1. Thereby, the display quality of the display device using the light source device of Embodiment 2 as a light source for the liquid crystal panel can be kept good.
- FIG. 11 is a schematic longitudinal sectional view of a part of the light source device according to the second modification of the second embodiment.
- the length of the outer shape of the light emitting diode 2 in the short direction is larger than the thickness of the light guide plate 1.
- the distance between the two pieces facing the short side direction of the peripheral wall 42 is reduced toward the light guide plate 1 as shown in FIG.
- the light guide plate 1 is abutted so as to be held inward.
- Two pieces of the peripheral wall 42 facing each other in the short direction have a substantially S-shaped cross section facing each other.
- the light incident surface of the light guide plate 1 and the peripheral wall 42 are radiated from the light emitting diode 2 because the light guide plate 1 is kept in contact with no gap even if the light guide plate 1 is thermally expanded or contracted.
- Light enters the light entrance surface of the light guide plate 1 into the inside, and it is possible to prevent the light guide plate 1 from coming into contact with the light emitting diode 2 without hindering thermal expansion of the light guide plate 1.
- the display quality of the display device using the light source device of Embodiment 2 as a light source for the liquid crystal panel can be kept good.
- FIG. 12 is a schematic cross-sectional view of a part of the light source device in Modification 3 of Embodiment 2.
- the peripheral wall 42 described above is provided on the substrate 3, and the spacer 5 is provided at a substantially intermediate position between the plurality of light emitting diodes 2.
- the height of the spacer 5 is higher than that of the light emitting diode 2 and lower than that of the peripheral wall 42. Further, the spacer 5 is harder than the peripheral wall 42.
- the outer wall 42 is deformed to the outside.
- the light guide plate 1 hits the spacer 5. Therefore, it is possible to more reliably prevent the light guide plate 1 from contacting the light emitting diode 2.
- FIG. 3 is a schematic cross-sectional view of a part of the light source device according to the third embodiment
- FIG. 14 is a vertical cross-sectional view taken along the line CC ′ of FIG.
- the light source device in the third embodiment is the same as that in the first embodiment except for the configuration of the peripheral wall. Therefore, in the following description, the same reference numerals are given to configurations common to the first embodiment, and detailed description is omitted.
- the substrate 3 includes a first peripheral wall 44 that is provided around each side wall of the plurality of light emitting diodes 2 that are provided side by side, and a second peripheral wall that further surrounds the first peripheral wall 44.
- a peripheral wall 43 is provided.
- the first peripheral wall 44 is harder than the second peripheral wall 43 and uses a light reflective material.
- the first peripheral wall 44 is made of, for example, white or mirror resin.
- the first peripheral wall 44 is rectangular and has a cross section whose thickness is tapered toward the light guide plate 1.
- the second peripheral wall 43 includes four tongue pieces bonded to the substrate 3 along the outer surface of the first peripheral wall 44.
- the second peripheral wall 43 is made of a material having light reflectivity and elasticity and made of, for example, solid white silicon rubber.
- the elastic body such as a foamed resin
- the second peripheral wall 43 be a viscous elastic body with some degree of waist.
- Each tongue piece of the second peripheral wall 43 is tapered toward the tip, and the tip of each tongue piece is bent toward the outside around the light emitting diode 2.
- the height of the second peripheral wall 43 is higher than that of the first peripheral wall 44.
- the first peripheral wall 44 and the second peripheral wall 43 may be configured such that a highly light-reflective member such as white or metal is disposed only on the inner surface, not on a solid surface.
- the substrate 3 is arranged with respect to the light guide plate 1 with the mounting surface of the light emitting diode 2 facing the long side of the light guide plate 1 (light incident surface).
- the second peripheral wall 43 is the same as the peripheral wall 42 in the second embodiment, and two of the four tongue pieces facing the short side direction of the substrate 3 are disposed inside the light guide plate 1 as shown in FIG. The two pieces that are in contact with each other and are opposed to each other in the longitudinal direction of the substrate 3 are configured such that the tip ends closely contact the light incident surface of the light guide plate 1.
- each tongue piece of the second peripheral wall 43 is larger than the facing distance between the light guide plate 1 and the substrate 3, and of the four tongue pieces, the two pieces facing the short direction of the substrate 3 are: The leading ends protrude to the wide surface side of the light guide plate 1. The two pieces of the second peripheral wall 43 facing the short side direction of the substrate 3 do not support the light guide plate 1, but are simply in contact with the edge of the light guide plate 1.
- FIG. 15 is an enlarged view of FIG. FIG. 15 schematically shows the internal structure of the light-emitting diode 2 in FIG.
- the light emitting diode 2 has a light emitting element 22 and a wiring 23 arranged on the front and back of a bottom plate of a rectangular deep dish-shaped container 21 made of white resin, and the light emitting element 22 and the wiring 23 are connected by a loosened wire 24.
- the container 21 is configured by filling a jelly-like phosphor 25.
- a highly reflective member such as a metal thin film may be provided on the inner surface of the container 21.
- a first peripheral wall 44 that is slightly higher than the container 21 is disposed between the second peripheral wall 43 and the container 21.
- the light guide plate 1 is connected to the light emitting diode 2 rather than the configuration in which the spacer 5 is disposed at a substantially intermediate position between the plurality of light emitting diodes 2. Contact can be more effectively prevented. Accordingly, the substrate 3 can be disposed close to the light guide plate 1, and the light incident efficiency on the light incident surface of the light guide plate 1 can be improved. Thereby, the display quality of the display device using the light source device of Embodiment 3 as a light source for the liquid crystal panel can be kept better.
- FIG. 16 is a schematic cross-sectional view of a part of the light source device according to the fourth embodiment.
- the light source device in the fourth embodiment is the same as that in the first or third embodiment except for the configuration of the peripheral wall. Therefore, in the following description, the same reference numerals are given to configurations common to the first or third embodiment, and detailed description is omitted.
- the structure 21 and the first peripheral wall 44 of the light emitting diode 2 in the third embodiment are integrated.
- the light emitting element 22 and the wiring 23 are respectively arranged on the front and back of the bottom plate of the housing 26, and the light emitting element 22 and the wiring 23 are connected by a loosened wire 24.
- the jelly-like phosphor 25 is filled.
- the container 26 is made of a material having high light reflectivity, and is made of, for example, a white resin.
- the container 26 is in the shape of a rectangular deep dish, and an outer side wall that is slightly higher than the inner side is provided around the outer side of the side wall.
- the depth of the groove is substantially the same as the depth of the container 26, and the shape of the groove is, for example, a trapezoidal groove.
- the container 26 may have a configuration in which a highly reflective member such as white or metal is disposed only on the inner surface.
- the light emitting diodes 2 including the container 26 are mounted on the substrate 3 such that the longitudinal direction of the light emitting diodes 2 is along the longitudinal direction of the substrate 3 at substantially equal intervals. Furthermore, a peripheral wall 45 is provided on the substrate 3 so as to surround each housing 26 of each light emitting diode 2.
- the peripheral wall 45 is made of a material having light reflectivity and elasticity and made of, for example, solid white silicon rubber.
- the peripheral wall 45 is harder than the container 26.
- the peripheral wall 45 may be an elastic body such as foamed resin, but is preferably a viscous elastic body with a certain degree of waist.
- Each tongue piece of the peripheral wall 45 is formed in a tapered shape toward the tip, and the tip of each tongue piece is bent toward the outside around the light emitting diode 2.
- the height of the peripheral wall 45 is higher than that of the container 26.
- the peripheral wall 45 may be a structure in which a highly reflective member such as white or metal is disposed only on the inner surface instead of being solid.
- the substrate 3 is disposed with respect to the light guide plate 1 with the mounting surface of the light emitting diode 2 facing the long side surface (light incident surface) of the light guide plate 1.
- the peripheral wall 45 abuts the two pieces of the four tongue pieces facing the short direction of the substrate 3 so as to grip the light guide plate 1 inward.
- the two pieces opposed to the longitudinal direction of the substrate 3 are arranged such that the tip ends are in close contact with the light incident surface of the light guide plate 1.
- the length of each tongue piece of the peripheral wall 45 is longer than the facing distance between the light incident surface of the light guide plate 1 and the substrate 3.
- two pieces facing the short direction of the substrate 3 are The tip protrudes toward the wide surface of the light guide plate 1. Note that the two pieces of the peripheral wall 45 facing the short side direction of the substrate 3 do not support the light guide plate 1, but the inner side simply contacts the edge of the light guide plate 1.
- the side wall of the container 26 is configured to have a slightly higher height on the outer side than the inner side, that is, the first peripheral wall 44 and the container 21 in the third embodiment are integrated. Accordingly, the prevention of the falling to the inside of the peripheral wall 45 surrounding the container 26 can be realized by reducing the number of parts.
- the fourth embodiment since a groove is provided between the inner side wall and the outer side wall of the container 26, an inward force is applied to the outer side wall portion of the container due to the deformation of the peripheral wall 45. Even in this case, the deformation of the outer side wall portion can be absorbed and the inner side wall portion can be prevented from being deformed. Also in the fourth embodiment, since the light guide plate 1 can be supported by the outer side wall portion of the container 26, the light guide plate 1 emits light more than the configuration in which the spacer 5 is disposed at a substantially intermediate position between the plurality of light emitting diodes 2. Contact with the diode 2 can be more effectively prevented.
- the facing distance between the light incident surface of the light guide plate 1 and the substrate 3 can be shortened, and the light incident efficiency on the light incident surface of the light guide plate 1 can be improved. Thereby, the display quality of the display device using the light source device of Embodiment 4 as a light source for the liquid crystal panel can be kept good.
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Abstract
Description
なお周壁は、基部から先端部へ向けて厚みが不変である角筒状、円筒状など簡素な構成でよい。この場合、周壁が高さ方向に最も収縮した場合に内部の発光ダイオードの蛍光体の表面が周壁よりも高くならないように、周壁の高さ及び周壁に用いられる材料の硬さが適切に設計されるとよい。
図1は、実施の形態1における光源装置の一部を拡大して示す模式斜視図である。光源装置は、導光板1、発光ダイオード2及び基板3を備える。
図4は、実施の形態1の変形例1における光源装置の一部の模式縦断面図である。変形例1では、発光ダイオード2の外形の短手方向の長さは導光板1の厚みと略等しい。これに対応するように、変形例1における周壁41の厚みは先端部において内側に拡大されている。なお、周壁41の先端部の変形によって厚みが拡大されるようにしてあってもよい。つまり、周壁41の内周面の短手方向における対向面間距離は、基板3側では導光板1の厚みと略等しいが、先端部において導光板1の厚みよりも小さくなるようにしてある。周壁41の短手方向の厚み以外の構成は実施の形態1と同一である。
図5は、実施の形態1の変形例2における光源装置の一部の模式縦断面図である。変形例2では、発光ダイオード2の外形の短手方向の長さは導光板1の厚みと略等しく、周壁41は短手方向の一部が導光板1の入光面に当接している。
図6は、実施の形態1の変形例3における光源装置の一部の模式断面図である。図6に示す如く基板3には、上述にて説明した周壁41が設けられており、更に、複数の発光ダイオード2の間の略中間位置にスペーサ5が設けられている。スペーサ5の高さは発光ダイオード2よりも高く、周壁41よりも低い。更に、スペーサ5の硬さは周壁41よりも硬い。
図7は、実施の形態2における光源装置の一部を拡大して示す模式斜視図である。実施の形態2における光源装置は、周壁の構成以外は実施の形態1と同様である。したがって以下の説明では、実施の形態1と共通する構成については同一の符号を付して詳細な説明を省略する。
図10は、実施の形態2の変形例1における光源装置の一部の模式縦断面図である。変形例1では、発光ダイオード2の外形の短手方向の長さは導光板1の厚みよりも小さい。これに対応するように、周壁42の短手方向に対向する2片は図10に示す如く、発光ダイオード2の側壁に対し隙間を有して設けられ、2片の対向面間距離は導光板1の厚みよりも少し小さくなるように設けられ、2片の先端部が導光板1を内側に咥え込むように当接するようにしてある。それ以外の構成は実施の形態2と同一である。
図11は、実施の形態2の変形例2における光源装置の一部の模式縦断面図である。変形例2では、発光ダイオード2の外形の短手方向の長さが導光板1の厚みよりも大きい。これに対応するように、周壁42の短手方向に対向する2片間の距離が図11に示す如く導光板1側へ向けて縮小するようにしてあり、且つ前記2片は、先端部が導光板1を内側に咥え込むように当接するようにしてある。周壁42の短手方向に対向する2片は、互いに向き合う略S字状の断面を有する。
図12は、実施の形態2の変形例3における光源装置の一部の模式断面図である。図12に示す如く基板3には、上述にて説明した周壁42が設けられており、更に、複数の発光ダイオード2の間の略中間位置にスペーサ5が設けられている。スペーサ5の高さは発光ダイオード2よりも高く、且つ周壁42よりも低い。更に、スペーサ5の硬さは周壁42よりも硬い。
図13は、実施の形態3における光源装置の一部の模式断面図であり、図14は図13のC-C´線による縦断面図である。実施の形態3における光源装置は、周壁の構成以外は実施の形態1と同様である。したがって以下の説明では、実施の形態1と共通する構成については同一の符号を付して詳細な説明を省略する。
図16は、実施の形態4における光源装置の一部の模式断面図である。実施の形態4における光源装置は、周壁の構成以外は実施の形態1又は3と同様である。したがって以下の説明では、実施の形態1又は3と共通する構成については同一の符号を付して詳細な説明を省略する。
2 発光ダイオード
21,26 収容体(他の周壁)
22 発光素子
23 配線群
26 蛍光体
3 基板
41,42,45 周壁
43 第2の周壁(周壁)
44 第1の周壁(他の周壁)
5 スペーサ
Claims (10)
- 矩形状の導光板と、該導光板の側面に対向する一面に複数の発光ダイオードが実装された短冊状の基板とを備える光源装置において、
前記基板には、内側面が光反射性を有する弾性体製の周壁が前記複数の発光ダイオードを各囲繞するように設けられており、
該周壁の高さは前記導光板と前記基板との間の対向距離以上である
ことを特徴とする光源装置。 - 前記周壁は基部よりも先端部が薄肉で、先端部が外側へ向けて反曲している
ことを特徴とする請求項1に記載の光源装置。 - 前記周壁の前記導光板の厚み方向に対向する内側面が、前記導光板の発光ダイオード側の縁に夫々当接している
ことを特徴とする請求項2に記載の光源装置。 - 前記周壁の内側に並設された他の周壁を更に有し、
該他の周壁は、
光反射性を有する内側面を有し、
前記周壁よりも硬く、
高さは前記周壁よりも低く、前記発光ダイオードよりも高い
ことを特徴とする請求項2又は3に記載の光源装置。 - 前記他の周壁は、前記発光ダイオードを構成する素子及び蛍光体を収容する収容体と一体化されてある
ことを特徴とする請求項4に記載の光源装置。 - 前記収容体と他の周壁との間には溝が設けてある
ことを特徴とする請求項5に記載の光源装置。 - 前記他の周壁の少なくとも内側面は、白色材又は鏡面材である
ことを特徴とする請求項4から6のいずれか1つに記載の光源装置。 - 前記周壁は、シリコンゴム製であることを特徴とする請求項1から7のいずれか1つに記載の光源装置。
- 前記基板には、前記周壁よりも硬いスペーサが複数の発光ダイオード間夫々に設けられており、
該スペーサの高さは前記発光ダイオードよりも高く前記周壁よりも低い
ことを特徴とする請求項1から8のいずれか1つに記載の光源装置。 - 液晶パネルと請求項1から9の光源装置のいずれか1つとを備えることを特徴とする表示装置。
Priority Applications (4)
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US15/310,414 US9958590B2 (en) | 2014-07-18 | 2014-07-18 | Light source device and display apparatus |
CN201480078939.8A CN106461170B (zh) | 2014-07-18 | 2014-07-18 | 光源装置和显示装置 |
PCT/JP2014/069228 WO2016009561A1 (ja) | 2014-07-18 | 2014-07-18 | 光源装置及び表示装置 |
JP2016534075A JP6279737B2 (ja) | 2014-07-18 | 2014-07-18 | 光源装置及び表示装置 |
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PCT/JP2014/069228 WO2016009561A1 (ja) | 2014-07-18 | 2014-07-18 | 光源装置及び表示装置 |
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CN106461170A (zh) | 2017-02-22 |
US9958590B2 (en) | 2018-05-01 |
JPWO2016009561A1 (ja) | 2017-04-27 |
JP6279737B2 (ja) | 2018-02-14 |
US20170261676A1 (en) | 2017-09-14 |
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