WO2011058960A1 - 照明装置、表示装置、及びテレビ受信装置 - Google Patents
照明装置、表示装置、及びテレビ受信装置 Download PDFInfo
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- WO2011058960A1 WO2011058960A1 PCT/JP2010/069903 JP2010069903W WO2011058960A1 WO 2011058960 A1 WO2011058960 A1 WO 2011058960A1 JP 2010069903 W JP2010069903 W JP 2010069903W WO 2011058960 A1 WO2011058960 A1 WO 2011058960A1
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- light
- light guide
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- unit
- led
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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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
- G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133601—Illuminating devices for spatial active dimming
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/02—Function characteristic reflective
- G02F2203/023—Function characteristic reflective total internal reflection
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- the display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices.
- a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism.
- an edge light type backlight device it is preferable to use an edge light type backlight device, and examples thereof include those described in Patent Documents 1 and 2 below.
- Patent Document 1 a plurality of light sources arranged in parallel at the end of the backlight device and a light guide plate that guides light from the light sources and emits the light toward the liquid crystal panel side.
- the light guide plate is configured to extend along a direction orthogonal to the parallel direction of the light sources, and a plurality of light guide plates are arranged in parallel along the parallel direction of the light sources.
- the individual light guide plates emit light entirely, and therefore partially in the direction orthogonal to the parallel direction of the light sources. The right or wrong of light emission could not be controlled.
- Patent Document 2 has a configuration in which a light source and a light guide plate having a light source arranged at an end are unitized, and a plurality of the units are arranged in parallel. According to such a configuration, it is possible to finely and partially control the light emission on the light emission surface of the entire backlight device by devising the arrangement of the units.
- the light source is distributed not only at the end portion of the backlight device but also at the center side, so that the installation work of the light source becomes troublesome and the workability deteriorates. In addition to this, there is a risk that the wiring configuration of the light source becomes complicated.
- the present invention has been completed based on the above-described circumstances, and uses an illumination device capable of partially controlling the right or wrong of light emission while concentrating and arranging light sources at the end, and the illumination device. It is an object to provide a display device.
- the lighting device of the present invention includes a plurality of light sources arranged in parallel at the end, a light guide unit arranged in parallel along the parallel direction of the light sources and receiving light from the light source, A plurality of light emitting units arranged in parallel along a direction intersecting the parallel direction of the light sources and emitting light from the light guide unit, and the light sources are at least relatively relative to the light sources.
- a plurality of light guide units, while a first light output unit disposed on the side and a second light output unit disposed on the side opposite to the light source side relative to the first light output unit are included. Includes at least a first light guide part optically connected to the first light output part and a second light guide part optically connected to the second light output part.
- the lighting device is of a so-called edge light type in which a plurality of light sources are arranged in parallel at the end thereof, it can be made thinner than a direct type.
- the light sources are concentrated and arranged at the end of the lighting device, the light source can be installed more easily than when the light source is arranged not only at the end but also at the center.
- the wiring configuration can be simplified.
- the first light exiting portion disposed at least relatively to the light source side, the first light exiting portion disposed in parallel along the direction intersecting the parallel direction of the light sources, and the first And a second light output portion disposed on the opposite side of the light source portion relative to the light source portion.
- the first light output portion includes the first light guide portion
- the second light output portion includes the second light guide portion. Since it is optically connected, for example, if the light source corresponding to the first light guide is turned on and the light source corresponding to the second light guide is not turned on, the second light is emitted from the first light exit while the second light is emitted. It is possible to perform control such that light is not emitted from the light emitting unit. That is, by controlling the driving of each light source corresponding to each light guide unit, it is possible to selectively control the right or left of light output from each light output unit.
- the light output section is arranged so as to overlap the light output section with respect to the optically connected light guide section.
- the length of the light guide unit is increased as compared with the case where the light guide unit and the light output unit are arranged in parallel along the parallel direction of the light output unit and are not overlapped with each other. Therefore, it is possible to sufficiently secure the optical path length of the light propagating in the light guide unit, and to spread the light over a wide range in the light output unit, so that the light introduced into the light output unit and the light output from the light output unit Unevenness in light is less likely to occur.
- the first light output unit is arranged to overlap the light output side with respect to the second light guide unit optically connected to the second light output unit.
- the second light guide unit optically connected to the second light output unit disposed on the side opposite to the light source side with respect to the first light output unit is covered from the light output side by the first light output unit. Therefore, the second light guide portion can be prevented from being visually recognized as a dark portion.
- the second light guide unit can have a simpler shape as compared with a case where the second light guide unit is configured to bypass the first light output unit so as not to overlap the first light output unit. .
- a plurality of the light output portions are arranged in parallel along a direction orthogonal to the parallel direction of the light sources, and the dimensions in the parallel direction of the light sources are substantially the same, and the sizes thereof are the plurality of the light sources.
- the size of each of the light guides that are optically connected to the light output part is approximately equal to the sum of the same dimensions. If it does in this way, the several light guide part paralleled along the parallel direction of a light source can be covered from the light-projection side by the light emission part over the whole region, respectively.
- the light output unit is Can be distributed evenly.
- At least the first light guide portion is provided with an extending portion that extends toward the side opposite to the light source side from the first light emitting portion. If it does in this way, the optical path length of the light which propagates the inside of a 1st light guide part can be enlarged by the part which provided the extension part. Thereby, unevenness is less likely to occur in the light introduced into the first light output portion.
- the second light emitting portion is disposed on the extending portion so as to overlap the light emitting side. If it does in this way, since an extension part will be covered from the light emission side by the 2nd light emission part, it can prevent an extension part being visually recognized as a dark part.
- the light exit portion is provided with a light exit surface for emitting light, and the light exit surface is provided with a light scattering portion for scattering light. If it does in this way, the light in a light emission part will be scattered by a light-scattering part, and the emission from a light-projection surface is promoted.
- the light output part has a dimension in the parallel direction of the light sources larger than that of the light guide part, and the light scattering part is a part where the light scattering degree overlaps with the light guide part.
- the part which does not overlap with the light guide is larger than the part. If it does in this way, the part which does not overlap with a light guide part among the light output parts will have a little light quantity which exists inside compared with the part which overlaps with a light guide part.
- the portion of the light that is not superimposed on the light guide portion is larger in the degree of light scattering than the portion that is superimposed on the light guide portion.
- the emission of light is suppressed at a portion where the amount of light existing inside is large, while the emission of light is promoted at a portion where the amount of light existing inside is small. Thereby, unevenness in the distribution of the emitted light is less likely to occur in the plane of the light emitting surface.
- the light scattering part has a light scattering degree that increases in a direction away from the light guide part. If it does in this way, distribution of emitted light can be made more uniform by a part which does not overlap with a light guide part among light output parts, and a part which overlaps with a light guide part.
- a reflection layer that reflects light is formed on an end surface of the light guide portion opposite to the end surface facing the light source. If it does in this way, the light which reached the end surface on the opposite side to the end surface which opposes a light source among light guide parts can be reflected by a reflection layer, and can be made to go to a light emission part. This is particularly useful when a light source with high directivity is used.
- the light guide unit and the light output unit are integrally formed. In this way, light can be introduced from the light guide portion to the light exit portion without being refracted, and the light use efficiency can be increased. Further, the number of parts is reduced and the assembly is easy.
- the light guide portions adjacent to each other in the parallel direction of the light sources are optically connected to the light output portions adjacent to each other in a direction crossing the parallel direction of the light sources. In this way, since the arrangement of the light guide unit and the light output unit that are optically connected to each other is simplified, the installation work thereof can be easily performed.
- the plurality of light sources that respectively supply light constitute one light emitting unit, and a plurality of the light emitting units are arranged in parallel along the parallel direction of the light sources. In this way, it is possible to increase the size of the light emitting surface in the lighting device.
- the plurality of light sources that respectively supply light constitute one light-emitting unit, and at least a pair of the light-emitting units are arranged back to back. In this way, it is possible to increase the size of the light emitting surface in the lighting device.
- the light source is an LED. In this way, it is possible to increase the brightness.
- the LED is mounted on an LED substrate extending along a parallel direction of the light guide unit. If it does in this way, arrangement
- a low refractive index layer having a refractive index lower than that of the light guide unit and the light output unit is interposed between the adjacent light guide units and between the adjacent light output units. If it does in this way, when the light in a light guide part will hit a boundary surface with a low-refractive-index layer, it will be propagated efficiently to a light-emitting part by substantially totally reflecting. Similarly, the light in the light exit portion is totally totally reflected when it hits the boundary surface with the low refractive index layer, so that it is prevented from leaking to the adjacent light exit portion side, and mutual optical independence is ensured.
- the low refractive index layer is an air layer. This eliminates the need for a special member for forming the low refractive index layer, and thus can cope with low cost.
- a reflective member that reflects light is disposed on a surface of the light guide portion opposite to the light emitting side. If it does in this way, light can be efficiently propagated to a light-emitting part by reflecting the light which reaches the surface on the opposite side to a light-projection side in a light guide part by a reflecting member.
- the reflection member is formed over a range extending over the plurality of light guides. If it does in this way, compared with the case where a reflection member is divided
- a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.
- the lighting device that supplies light to the display panel can control the right or wrong of light emission while concentrating the light source at the end portion.
- the display quality can be improved.
- a liquid crystal panel can be exemplified as the display panel.
- Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.
- an illuminating device capable of partially controlling the right or wrong of light emission while concentrating and arranging light sources at the end, and a display device using the illuminating device.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- the exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped
- Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device
- Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device
- Plan view showing planar arrangement of LED and each light guide member
- the top view which shows the state before assembling
- FIG. 5 is a cross-sectional view taken along the line viii-viii showing the arrangement configuration of each light guide member
- FIG. 5 is a cross-sectional view taken along the line ix-ix in FIG. Xx line sectional view of Drawing 5 showing arrangement composition of each light guide member Xi-xi sectional view of FIG. 5 showing the arrangement configuration of each light guide member 5 is a cross-sectional view taken along line xii-xii in FIG.
- FIGS. 1 A first embodiment of the present invention will be described with reference to FIGS.
- the liquid crystal display device 10 is illustrated.
- a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing.
- the upper side shown in FIG.3 and FIG.4 be a front side, and let the lower side of the figure be a back side.
- 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.
- the liquid crystal display device (display device) 10 has a horizontally long rectangular shape (rectangular shape) as a whole and is accommodated in a vertically placed state.
- the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
- the liquid crystal panel 11 has a rectangular shape in plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. It is said.
- 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.
- a polarizing plate is disposed on the outside of both substrates.
- the backlight device 12 is disposed so as to cover a substantially box-shaped chassis 14 having an opening on the light emitting surface side (the liquid crystal panel 11 side), and the opening of the chassis 14.
- Optical member 15 group diffusing plate (light diffusing member) 15a and a plurality of optical sheets 15b arranged between the diffusing plate 15a and the liquid crystal panel 11), and the optical member 15 arranged along the outer edge of the chassis 14.
- a frame 16 that holds the outer edge of the group between the chassis 14 and the frame 16.
- an LED 17 Light Emitting Diode
- an LED substrate 18 on which the LED 17 is mounted and light from the LED 17 are guided to the optical member 15 (liquid crystal panel 11).
- the backlight device 12 includes LED substrates 18 having LEDs 17 at both ends on the long side, and a large number of light guide members 19 are arranged on the center side between the LED substrates 18. This is a so-called edge light type (side light type). Below, each component of the backlight apparatus 12 is demonstrated in detail.
- the chassis 14 is made of metal, and as shown in FIGS. 3 and 4, a bottom plate 14 a that is rectangular like the liquid crystal panel 11, a side plate 14 b that rises from the outer end of each side of the bottom plate 14 a, and each side plate 14b includes a receiving plate 14c projecting inwardly from a pair of side plates 14b on the long side, and as a whole, has a shallow substantially box shape opening toward the front side.
- the long side direction of the chassis 14 coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction).
- a frame 16 and an optical member 15 to be described below can be placed on each receiving plate 14c in the chassis 14 from the front side.
- a frame 16 is screwed to each receiving plate 14c.
- the optical member 15 has a rectangular shape in plan view, like the liquid crystal panel 11 and the chassis 14. As shown in FIG. 3, the optical member 15 has an outer edge portion placed on the receiving plate 14 c so as to cover the opening of the chassis 14 and is interposed between the liquid crystal panel 11 and the light guide member 19. Is done.
- the optical member 15 includes a diffusion plate 15a disposed on the back side (light guide member 19 side, opposite to the light emitting side) and an optical sheet 15b disposed on the front side (liquid crystal panel 11 side, light emitting side). Composed.
- the diffusing plate 15a has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light.
- the optical sheet 15b has a sheet shape that is thinner than the diffusion plate 15a, and two optical sheets 15b are arranged in a stacked manner (FIG. 2).
- Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.
- the frame 16 is configured to extend along the long side direction of the chassis 14, and is attached to the front side of the receiving plate 14 c in the chassis 14. A long side edge of the optical member 15 can be sandwiched between the frame 16 and the receiving plate 14c. Further, the frame 16 can receive a long side edge of the liquid crystal panel 11 from the back side.
- the holder 21 is made of white synthetic resin. As shown in FIGS. 2 and 4, the holder 21 has a substantially elongated box shape extending along the short side direction of the chassis 14. It is attached to the chassis 14 in a state of being arranged along the side plate 14b. The holder 21 has a stepped surface on the surface side where the optical member 15 and the liquid crystal panel 11 can be placed in different steps, and can receive a short side edge of the optical member 15 and the liquid crystal panel 11 from the back side. it can.
- the LED 17 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18.
- the LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used.
- a phosphor that converts blue light emitted from the LED chip into white light is dispersed and blended in the resin material for sealing the LED chip.
- the LED 17 can emit white light.
- the LED 17 is a so-called top type in which a surface opposite to the mounting surface with respect to the LED substrate 18 is a light emitting surface.
- the LED substrate 18 is formed in an elongated plate shape extending along the long side direction (X-axis direction) of the chassis 14, and its main plate surface is parallel to the X-axis direction and the Z-axis direction. It is accommodated in the chassis 14 in such a posture, that is, a posture orthogonal to the plate surfaces of the liquid crystal panel 11 and the optical member 15.
- the LED boards 18 are arranged in pairs corresponding to both ends on the long side in the chassis 14 and are attached to the inner surfaces of the side plates 14b on the long side.
- the LED 17 having the above-described configuration is surface-mounted on the main plate surface of the LED substrate 18.
- each LED 17 is arranged in a line (linearly) along the length direction (X-axis direction) on the main plate surface of the LED substrate 18. Accordingly, it can be said that a plurality of LEDs 17 are arranged in parallel along the long side direction at both ends on the long side of the backlight device 12. Since the pair of LED substrates 18 are housed in the chassis 14 with the mounting surfaces of the LEDs 17 facing each other, the light emitting surfaces of the LEDs 17 respectively mounted on the LED substrates 18 are opposed to each other, The optical axis of each LED 17 substantially coincides with the Y-axis direction.
- the base material of the LED substrate 18 is made of a metal such as an aluminum material same as that of the chassis 14, and a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer.
- the configuration is The LEDs 17 arranged in parallel on the LED substrate 18 are connected in series by this wiring pattern.
- insulating materials such as a ceramic, can also be used as a material used for the base material of LED board 18.
- the light guide member 19 is made of a synthetic resin material (for example, acrylic) having a refractive index sufficiently higher than that of air and substantially transparent (exceeding translucency).
- a large number of light guide members 19 are arranged in parallel in the chassis 14 immediately below the liquid crystal panel 11 and the optical member 15, and at both ends of the chassis 14 in the long side direction. It arrange
- the alignment direction of the LED 17 (LED substrate 18) and the light guide member 19 coincides with the Y-axis direction, whereas the alignment direction of the optical member 15 (liquid crystal panel 11) and the light guide member 19 is the Z-axis direction. And the arrangement directions of the two are orthogonal to each other.
- the light guide member 19 introduces light emitted from the LED 17 in the Y-axis direction, and rises and emits the light toward the optical member 15 side (Z-axis direction) while propagating the light inside. It has a function.
- a reflection sheet 20 is disposed between the back side of each light guide member 19, that is, between the bottom plate 14 a of the chassis 14, and the light in the light guide member 19 (light guide portion 22) is transmitted by the reflection sheet 20.
- the reflection sheet 20 is laid over almost the entire area of the bottom plate 14 a of the chassis 14, and is disposed so as to straddle all the light guide members 19.
- three types of light guide members 19 having different shapes are used. In the following, the common structure of each light guide member 19 is described first, and then each light guide member 19 is used. The difference structure will be described.
- the light guide member 19 guides the light from the LED 17 substantially along the Y-axis direction, and the front side with respect to the light guide unit 22 (on the optical member 15 side). And a light output part 23 that emits light from the light guide part 22 toward the front side substantially along the Z-axis direction.
- the light guide part 22 and the light output part 23 is formed integrally. Therefore, the light guide unit 22 and the light output unit 23 are arranged in parallel along the Z-axis direction (light rising direction) and are optically connected to each other without having an interface (seam). In other words, the light exit part 23 is configured to protrude from the light guide part 22 toward the front side.
- each light output portion 23 is formed in a matrix form in the X-axis direction and the Y-axis direction.
- the light can be emitted toward the panel 11.
- the light guide section 22 has a substantially prismatic shape extending along the Y-axis direction, and a cross-sectional shape cut along a direction orthogonal to the length direction (axis direction) forms a horizontally long rectangular shape in the X-axis direction. Yes.
- an end surface that faces the light emitting surface of the LED 17 (the mounting surface of the LED substrate 18) is a light incident surface 22 a on which light from the LED 17 is incident.
- the light incident surface 22a extends along the X-axis direction and the Z-axis direction, and is in a relationship orthogonal to the liquid crystal panel 11 and the plate surface of the optical member 15.
- the alignment direction (Y-axis direction) of the LED 17 and the light incident surface 22a is parallel to a light emitting surface 23a of the light emitting unit 23 described later.
- a reflection layer 22b that reflects light propagating through the light guide 22 is formed on the end face of the light guide 22 opposite to the light incident surface 22a.
- the reflection layer 22b is formed by evaporating a metal film having excellent light reflectivity on the end surface of the light guide unit 22, for example.
- the reflective layer 22 b faces the LED 17 via the light guide unit 22.
- the length dimension (dimension in the Y-axis direction) of the light guide unit 22 is about half of the short side dimension of the chassis 14.
- the width dimension (dimension in the X-axis direction) of the light guide section 22 is smaller than the light output section 23 described below, and is about 1/3, for example.
- the light exiting portion 23 has a substantially square plate shape when viewed from above, and the back surface thereof is connected to a predetermined position in the length direction on the front surface of the light guide portion 23, and the continuous portion is the interface. It is optically connected without going through.
- the light exit portion 23 has a size in the X-axis direction larger than that of the light guide portion 22 and is about three times, for example, whereas the size in the Y-axis direction is smaller than that of the light guide portion 22 and is about 1/3, for example. The following is assumed. Accordingly, the light exiting portion 23 is superimposed on the light guide portion 22 in the Y-axis direction over the entire region and partially in the X-axis direction (about 1 /) in plan view.
- the light output part 23 is not overlapped with and directly connected to the connection part CA that overlaps the light guide part 22 in the X-axis direction and is optically directly connected. It can be divided into connection parts CN, of which the connection part CA occupies about 1/3 of the entire light emission part 23 and the non-connection part CN occupies about 2/3 of the whole light emission part 23 (FIG. 6). ).
- the light exit part 23 is configured to project outward from the light guide part 22 in the X-axis direction (a direction orthogonal to the light guide direction in the light guide part 22).
- the thickness dimension (dimension in the Z-axis direction) of the light guide unit 22 and the light output unit 23 is substantially the same as each other, and is approximately the width dimension of the LED substrate 18.
- the front side surface (surface opposite to the light guide unit 22 side) of the light output unit 23 is a light output surface 23 a from which light is emitted over the entire area.
- the light emitting surface 23a is along the plate surfaces (X-axis direction and Y-axis direction) of the liquid crystal panel 11 and the optical member 15, and is in a relationship orthogonal to the light incident surface 22a.
- a light scattering portion 24 that scatters light is formed on the light emitting surface 23a, thereby prompting light emission. As the degree of light scattering by the light scattering portion 24 increases, the light emission is promoted, whereas as the light scattering degree decreases, the light emission tends to be suppressed.
- the light scattering unit 24 is formed by printing light scattering particles such as silica and titanium oxide on the light emitting surface 23a. As shown in FIG. 6, the light scattering portion 24 is composed of a large number of dots 24a, and by changing the dot pattern within the light emitting surface 23a, the degree of light scattering on the light emitting surface 23a, that is, Easiness of emission (difficulty of emission) can be changed. Specifically, since the degree of light scattering is proportional to the size of the area of the dot 24a forming the light scattering portion 24, the light scattering portion 24 has an area of the dot 24a within the plane of the light emitting surface 23a. Patterned to change.
- the dot 24a of the light scattering portion 24 has a constant area in the connection portion CA in the light emission portion 23, the area changes in the X-axis direction in the non-connection portion CN, and the connection portion CA. It becomes smaller as it gets closer to, and becomes larger as it gets farther from the connection CA (FIGS. 10 to 12). And the dot 24a of the light-scattering part 24 has the smallest area in the connection part CA among the light emission parts 23, and becomes the largest in the edge part on the opposite side to the connection part CA side in the non-connection part CN.
- the amount of light present in the light exiting portion 23 tends to increase as it is closer to the light guide portion 22 that is a light supply source, and to decrease as it is farther from the light guide portion 22.
- the degree of light scattering on the light exit surface 23a as described above, light emission is suppressed in the connection part CA where the amount of light inside is relatively large, while in the non-connection part CN. Light emission is promoted as the amount of light inside decreases. Thereby, the distribution of the emitted light can be made uniform in the plane of the light emitting surface 23a.
- each light guide member 19 is structurally different in that the connection position of the light output part 23 with respect to the light guide part 22 is different in the X-axis direction and the Y-axis direction.
- the subscript A is added to the code of the first light guide member
- the subscript B is added to the code of the second light guide member
- the code of the third light guide member is used.
- the subscript C is added and generically referred to without distinction, the subscript is not added to the code.
- the light guides 22 and the light exiting parts 23 that constitute each light guide member 19 are also distinguished from each other in correspondence with the first light guide member 19A to the third light guide member 19C. 22A to the third light guide unit 22C, and the first light output unit 23A to the third light output unit 23C.
- the first light guide member 19 ⁇ / b> A has a first light output portion 23 ⁇ / b> A at a position closest to the light incident surface 22 a (LED 17) in the first light guide portion 22 ⁇ / b> A in the Y-axis direction.
- the first light guide portion 22A is arranged at the left end portion of the first light exit portion 23A shown in FIGS. 6 and 10 in the X-axis direction. Accordingly, the left end portion shown in FIGS. 6 and 10 of the first light output portion 23A is a connection portion CA that is overlapped with and directly connected to the first light guide portion 22A, whereas About 2/3 of the parts are not connected to the first light guide part 22A and are not connected directly.
- the 22 A of 1st light guide parts have a part further extended on the opposite side to the light-incidence surface 22a side rather than the 1st light emission part 23A, and in order to ensure the optical path length of the light which propagates inside here. It is set as the 1st extension part 25 (FIG. 7).
- the first extending portion 25 has a size such that the dimension in the Y-axis direction is the sum of the same dimensions in the second light emitting portion 23B and the third light emitting portion 23C described later.
- the second light guide member 19 ⁇ / b> B has a second light output portion 23 ⁇ / b> B disposed at a substantially central position in the second light guide portion 22 ⁇ / b> B in the Y-axis direction and the X-axis. It is set as the structure by which the 2nd light guide part 22B was distribute
- the portion 22B is a pair of non-connection portions CN that do not overlap and are not directly connected.
- the second light guide portion 22B has a portion that further extends to the side opposite to the light incident surface 22a side than the second light output portion 23B, and this is the second extension portion 26 (FIG. 8). ).
- the second extending part 26 has a dimension in the Y-axis direction that is substantially the same as that of a third light emitting part 23C described later, and is shorter than the first extending part 25 described above.
- the third light guide member 19 ⁇ / b> C has a third light output portion 23 ⁇ / b> C at a position farthest from the light incident surface 22 a (LED 17) in the third light guide portion 22 ⁇ / b> C in the Y-axis direction.
- the third light guide portion 22C is arranged at the left end portion of the third light exit portion 23C shown in FIGS. 6 and 12 in the X-axis direction. Accordingly, the right end portion of the third light output portion 23C shown in FIGS.
- connection portion CA that overlaps and is directly connected to the third light guide portion 22C, whereas the left end portion thereof About 2/3 of the portion does not overlap with the third light guide portion 22C and is not connected directly.
- the third light guide 22C does not have the extending portions 25 and 26 like the first light guide 22A and the second light guide 22B described above.
- each of the light guide members 19A to 19C configured as described above is assembled in the chassis 14 as a set of three, and the mutual relationship in the assembled state will be described in detail.
- each of the three types of light guide members 19A to 19C has the light guide portions 22A to 22C linearly aligned along the X-axis direction, and the light output portions 23A to 23C are arranged in the Y-axis direction.
- the light incident surfaces 22a in the light guide portions 22A to 22C are substantially flush with each other, and the distance between the opposing LEDs 17 is substantially uniform.
- the light exit surfaces 23a in the light exit portions 23A to 23C are substantially flush with each other, and the distance between the facing optical member 15 is substantially uniform.
- the light output portions 23A to 23C of the light guide members 19A to 19C are arranged in parallel from the LED 17 side in the order of the first light output portion 23A, the second light output portion 23B, and the third light output portion 23C.
- the light guides 22A to 22C are arranged in parallel in the order of the first light guide 22A, the second light guide 22B, and the third light guide 22C from the left side shown in FIG. 5 when viewed from the LED 17 side. That is, it can be said that the light guide portions 22A to 22C adjacent in the X-axis direction are optically connected to the light output portions 23A to 23C adjacent in the Y-axis direction, respectively.
- the non-connecting portion CN in the first light exiting portion 23A overlaps with the second light guide portion 22B and the third light guide portion 22C in a plan view, and collectively cuts across them. It is arranged to cover from the front side.
- the non-connection portion CN in the second light output portion 23B is viewed in plan with respect to the first light guide portion 22A (first extension portion 25) and the third light guide portion 22C, respectively, as shown in FIG. These are arranged so as to cover from the front side while crossing each of them.
- FIG. 10 the non-connecting portion CN in the first light exiting portion 23A overlaps with the second light guide portion 22B and the third light guide portion 22C in a plan view, and collectively cuts across them. It is arranged to cover from the front side.
- the non-connection portion CN in the second light output portion 23B is viewed in plan with respect to the first light guide portion 22A (first extension portion 25) and the third light guide portion 22C, respectively, as shown in FIG. These are arranged so
- the non-connecting part CN in the third light output part 23C is composed of a first light guide part 22A (first extension part 25) and a second light guide part 22B (second extension part 26). ) In a plan view and are arranged so as to cover them from the front side while crossing them.
- Air layers AR are interposed between 23A and 23C, respectively, so that they are kept substantially in contact with each other.
- the air layer AR is made sufficiently smaller in refractive index than the material forming the light guide member 19. Therefore, the light propagating through each of the light guide members 19A to 19C is almost totally reflected when it hits the boundary surface with the air layer AR, and the internal reflection of the reflection by the reflection sheet 20 and the reflection layer 22b. Light is prevented from leaking outside. Thereby, it is possible to ensure optical independence between the light guide members 19A to 19C and to selectively control the right and left of the light emitted from the light emitting portions 23A to 23C.
- the second light guide part 22 ⁇ / b> B lies in the back side of the first light output part 23 ⁇ / b> A and is located farther (center side) from the LED 17 than the first light output part 23 ⁇ / b> A. Therefore, the light from the LED 17 corresponding to the second light guide part 22B can be directly propagated to the second light output part 23B without passing through the first light output part 23A. It is said.
- the third light guide unit 22 ⁇ / b> C lies behind the first light output unit 23 ⁇ / b> A and the second light output unit 23 ⁇ / b> B, and the LED 17 rather than the first light output unit 23 ⁇ / b> A and the second light output unit 23 ⁇ / b> B.
- the light exit portion 23 (second light exit portion 23B) disposed at a position sandwiching the other light exit portion 23 (the first light exit portion 23A, or the first light exit portion 23A and the second light exit portion 23B) between the LED 17 and the LED 17.
- the light exit portion 23 (second light exit portion 23B) disposed at a position sandwiching the other light exit portion 23 (the first light exit portion 23A, or the first light exit portion 23A and the second light exit portion 23B) between the LED 17 and the LED 17.
- the chassis 14 has a structure as shown in FIGS.
- a plurality (10 in FIG. 2) of the light emitting units U are arranged in parallel in the X-axis direction, and a pair of light-emitting units U are arranged in parallel back to back in the Y-axis direction. That is, the light guide members 19A to 19C forming the light emitting units U arranged in parallel in the X-axis direction and the light guide members 19A forming a pair of light-emitting units U arranged with the center position in the Y-axis direction of the chassis 14 interposed therebetween.
- the same parts are used for all of ⁇ 19C.
- the set of light guide members 19A to 19C is reversed.
- the light emitting surface of the backlight device 12 as a whole is configured by a set of light emitting surfaces 23a in the light emitting units 23A to 23C constituting the light emitting unit U.
- This embodiment has the structure as described above, and its operation will be described next.
- the driving of the liquid crystal panel 11 is controlled by a control circuit (not shown), and the driving of each LED 17 in the backlight device 12 is controlled to irradiate the liquid crystal panel 11 with illumination light.
- a predetermined image is displayed on the liquid crystal panel 11.
- the operation of the backlight device 12 will be described in detail.
- each LED 17 when each LED 17 is turned on, the light emitted from each LED 17 is incident on the light incident surface 22a of the light guide 22 as shown in FIGS.
- the light taken into the light guide section 22 from the light incident surface 22a is reflected by the reflection sheet 20 or the reflection layer 22b, or is totally reflected at the boundary surface with the external air layer AR, and hardly leaks.
- the light propagates through the interior and eventually enters the light exit 23 side.
- the reflective layer 22b is arranged to face the LED 17 which is a light source with high directivity, it is possible to efficiently reflect high intensity light along the optical axis of the LED 17.
- the light guide portions 22A and 22B extend from the light exit portions 23A and 23B to the side opposite to the light incident surface 23a side. 25 and 26, respectively, and the light propagates through the extending portions 25 and 26, so that the optical path length, which tends to be shorter than that of the third light guide portion 22C, is reduced to the third light guide portion 22C. Can be assured.
- By sufficiently securing the optical path length it is possible to spread light to every corner of each of the light exit portions 23A and 23B in the Y-axis direction, and thus to the light introduced into each of the light exit portions 23A and 23B in the Y-axis direction. Unevenness is less likely to occur.
- the light introduced into the light exit portion 23 reaches the light exit surface 23 a by being totally reflected at the boundary surface with the air layer AR in the light exit portion 23.
- the light hits the light scattering portion 24 formed on the light emitting surface 23a, the light is scattered there to generate light having an incident angle smaller than the critical angle, and most of the light is emitted from the light emitting surface 23a to the outside.
- the light which hits the non-formation part of the light-scattering part 24 among the light-projection surfaces 23a is totally reflected, and propagates in the light-emitting part 23 again.
- the light scattering portion 24 has a minimum area of the dot 24a in the connection portion CA in the light output portion 23, whereas the area of the dot 24a in the non-connection portion CN. It is larger than the connection portion CA and larger as the distance from the connection portion CA increases.
- the amount of light present in the light exit part 23 is the largest in the connection part CA directly connected to the light guide part 22, whereas in the non-connection part CN not directly connected to the light guide part 22, the light quantity exists in the light output part 23. The number decreases as the distance from the connection portion CA decreases.
- the degree of light scattering by the light scattering portion 24 on the light exit surface 23a has a distribution that is inversely proportional to the amount of light present in the light exiting portion 23, light scattering is caused at the connection portion CA having a large amount of light. While the degree is low and the emission of light is suppressed, the non-connection portion CN with a small amount of light has a high degree of light scattering and promotes the emission of light. As a result, the light emitted from the light emitting surface 23a becomes uniform in the surface, thereby avoiding unevenness.
- each LED 17 By turning on each LED 17 as described above, light is emitted from the light exit surface 23a of each light exit portion 23 of each corresponding light guide member 19, and a backlight device configured by a set of these light exit surfaces 23a.
- the planar light is emitted from the entire light emitting surface 12.
- the light output from each light output part 23 is controlled. It is possible to control the right and wrong individually.
- the image to be displayed includes a black display region and a non-black display region
- an arrangement that mainly supplies light to the non-black display region (specifically, for example, a non-black display region)
- Only the LED 17 optically connected to the light exiting portion 23 of the arrangement (superposed in plan view) is turned on to emit light from the light exiting portion 23, while the light is mainly supplied to the black display region.
- the LED 17 that is optically connected to the light emitting unit 23 in a specific arrangement specifically, for example, an arrangement that overlaps with the black display area in plan view
- a large difference in brightness between the black display area and the non-black display area can be secured, so that high contrast performance can be obtained and display quality is excellent, and in addition, low power consumption is achieved. Can also be achieved.
- the LEDs 17 are aggregated and arranged at both ends in the Y-axis direction of the backlight device 12, but the light emitting units 23 arranged in parallel in the Y-axis direction are arranged. It is characterized by its ability to selectively control the right or wrong of Idemitsu. Specifically, each LED 17 arranged at both ends in the Y-axis direction is individually optically connected to each light output unit 23 arranged in parallel in the Y-axis direction via each light guide unit 22. Has been. Among these, as shown in FIG.
- the 2nd light emission part 23B distribute
- the third light output part 23 ⁇ / b> C arranged at the position (center side) sandwiching the first light output part 23 ⁇ / b> A and the second light output part 23 ⁇ / b> B between the LED 17 and the LED 17, Since the LED 17 is optically connected to the corresponding LED 17 via the third light guide 22C arranged in the form of diving behind the light exit 23A and the second light exit 23B, for example, the first light exit 23A or the second light exit It is possible to perform control such that light is emitted from the unit 23B but not from the third light emitting unit 23C.
- the light emitting area and the non-light emitting area of the backlight device 12 can be more finely controlled according to the image to be displayed, and the contrast performance is further improved.
- the right or wrong of the light emission from each light emission part 23 arranged in parallel by the X-axis direction can also be controlled selectively.
- the LEDs 17 are arranged at the end of the backlight device 12 in the Y-axis direction, the installation work at the time of assembly is easier than in the case where the LEDs are distributed evenly on the center side.
- the wiring configuration related to the LED 17 can be simplified.
- the backlight device 12 of the present embodiment is arranged in parallel along the parallel direction (X-axis direction) of the LEDs 17 that are light sources arranged in parallel at the end and the LEDs 17.
- the second light output unit 23B arranged in the first light output unit 23A and the second light output unit 22B are optically connected to the first light output unit 23A.
- the second optically connected to the unit 23B It contains an optical unit 22B.
- the backlight device 12 is a so-called edge light type in which a plurality of LEDs 17 are arranged in parallel at the end thereof, the backlight device 12 can be made thinner than a direct type.
- the LEDs 17 are concentrated and arranged at the end of the backlight device 12, it is easier to install the LED 17 than when the LEDs are arranged not only at the end but also at the center. And the wiring configuration can be simplified.
- the first light emitting unit 23A disposed at least relatively on the LED 17 side is arranged at least on the light emitting unit 23 disposed in parallel along the direction intersecting the parallel direction of the LEDs 17.
- a second light output part 23B disposed on the opposite side of the LED 17 relative to the first light output part 23A is included, the first light guide part 22A is included in the first light output part 23A, and the second light output part 23B. Since the second light guide 22B is optically connected to each other, for example, if the LED 17 corresponding to the first light guide 22A is turned on and the LED 17 corresponding to the second light guide 22B is not lit, It is possible to perform control such that light is emitted from the first light emitting unit 23A but not emitted from the second light emitting unit 23B. That is, by controlling the driving of each LED 17 corresponding to each light guide unit 22, it is possible to selectively control the right or wrong of the light output from each light output unit 23. According to the present embodiment, there is provided a backlight device 12 capable of partially controlling the right or wrong of light emission while LEDs 17 are concentrated and arranged at the end, and a liquid crystal display device 10 using the backlight device 12. be able to.
- the light output part 23 is arranged so as to be superimposed on the light emission side (front side) with respect to the optically connected light guide part 22.
- the length of the light guide unit 22 is increased as compared with the case where the light guide unit and the light output unit are arranged in parallel along the parallel direction of the light output unit and are not superimposed on each other. Accordingly, it is possible to sufficiently secure the optical path length of the light propagating through the light guide unit 22 and to spread the light over a wide range in the light output unit 23, so that the light introduced into the light output unit 23 and the light output Unevenness is less likely to occur in the light emitted from the portion 23.
- the first light output part 23A is arranged so as to overlap the light output side with respect to the second light guide part 22B optically connected to the second light output part 23B.
- the second light guide unit 22B optically connected to the second light output unit 23B disposed on the opposite side of the LED 17 with respect to the first light output unit 23A is light-transmitted by the first light output unit 23A. Since it will be covered from the output side, it can prevent the 2nd light guide part 22B being visually recognized as a dark part.
- the second light guide 22B has a simpler shape than the case where the second light guide is configured to bypass the first light output 23A so that it does not overlap the first light output 23A. be able to.
- a plurality of light output portions 23 are arranged in parallel along a direction (Y-axis direction) orthogonal to the parallel direction of the LEDs 17, and the dimensions in the parallel direction of the LEDs 17 are substantially the same.
- the light guides 22 that are optically connected to the light output parts 23 are substantially equal to the sum of the same dimensions of the light guide parts 22. If it does in this way, the some light guide part 22 paralleled along the parallel direction of LED17 can be covered from the light-projection side by the light emission part 23 over the whole region, respectively.
- the light emission part 23 is made into the light emission surface of the said backlight apparatus 12. It can be arranged evenly in the plane.
- the first light guide portion 22A is provided with a first extension portion 25 that extends toward the opposite side of the LED 17 from the first light output portion 23A.
- the optical path length of the light propagating through the first light guide portion 22A can be increased by the amount of the first extending portion 25 provided. Thereby, unevenness is less likely to occur in the light introduced into the first light exit portion 23A.
- the same second extending portion 26 is also provided in the second light guide portion 22B.
- a second light emitting portion 23B is arranged on the first extending portion 25 so as to overlap the light emitting side. If it does in this way, since the 1st extension part 25 will be covered from the light emission side by the 2nd light emission part 23B, it can prevent the 1st extension part 25 being visually recognized as a dark part.
- the light exit portion 23 is provided with a light exit surface 23a for emitting light, and the light exit portion 23a is provided with a light scattering portion 24 for scattering light. In this way, the light in the light exiting portion 23 is scattered by the light scattering portion 24, so that emission from the light exit surface 23a is promoted.
- the light output part 23 has a larger dimension in the parallel direction of the LEDs 17 than the light guide part 22, and the light scattering part 24 is a part (connection) where the degree of light scattering overlaps with the light guide part 22.
- the part (non-connecting part CN) that does not overlap with the light guide part 22 is larger than the part CA). If it does in this way, the part (non-connection part CN) which does not overlap with the light guide part 22 among the light emission parts 23 will have the light quantity which exists inside compared with the part (connection part CA) which overlaps with the light guide part 22. There are few things.
- the light scattering portion 24 provided on the light emitting surface 23a is a portion (non-overlapping) that does not overlap the light guide portion 22 than the portion where the light scattering degree overlaps the light guide portion 22 (connection portion CA). Since the connection portion CN) is larger, light emission is suppressed at a portion where the amount of light existing inside the light emitting portion 23 is large, while light is emitted at a portion where the amount of light existing inside is small. Is promoted. As a result, unevenness in the distribution of the emitted light is less likely to occur in the plane of the light emitting surface 23a.
- the light scattering portion 24 is assumed to have a greater degree of light scattering toward the direction away from the light guide portion 22. In this way, the distribution of the emitted light can be made more uniform between the portion of the light output portion 23 that does not overlap the light guide portion 22 and the portion that overlaps the light guide portion 22.
- a reflection layer 22b that reflects light is formed on the end face of the light guide 22 opposite to the end face facing the LED 17. If it does in this way, the light which reached the end surface on the opposite side to the end surface facing LED17 among the light guide parts 22 can be reflected by the reflection layer 22b, and can be made to go to the light emission part 23. FIG. This is particularly useful when the LED 17 having high directivity is used.
- the light guide part 22 and the light output part 23 are integrally formed. In this way, light can be introduced from the light guide portion 22 to the light exit portion 23 without being refracted, and the light utilization efficiency can be increased. Further, the number of parts is reduced and the assembly is easy.
- the light guide portions 22 adjacent to each other in the parallel direction of the LEDs 17 are optically connected to the light output portions 23 adjacent to each other in the direction intersecting with the parallel direction of the LEDs 17. In this way, since the arrangement of the light guide unit 22 and the light output unit 23 that are optically connected to each other is simplified, the installation work can be easily performed.
- a plurality of light output portions 23 arranged in parallel in a direction intersecting with the parallel direction of the LEDs 17, a plurality of light guide portions 22 optically connected to the respective light output portions 23, and the light guide portions 22
- Each of the plurality of LEDs 17 that supply light constitutes one light emitting unit U, and a plurality of the light emitting units U are arranged in parallel along the parallel direction of the LEDs 17. In this way, the light emitting surface of the backlight device 12 can be increased in size.
- a plurality of light output portions 23 arranged in parallel in a direction intersecting with the parallel direction of the LEDs 17, a plurality of light guide portions 22 optically connected to the respective light output portions 23, and the light guide portions 22
- Each of the plurality of LEDs 17 that supply light constitutes one light emitting unit U, and at least a pair of the light emitting units U are arranged back to back. In this way, the light emitting surface of the backlight device 12 can be increased in size.
- the light source is the LED 17. In this way, it is possible to increase the brightness.
- the LED 17 is mounted on the LED substrate 18 extending along the parallel direction of the light guide 22. If it does in this way, arrangement
- an air layer AR is interposed between the adjacent light guide portions 22 and between the adjacent light exit portions 23 as a low refractive index layer having a lower refractive index than the light guide portions 22 and the light exit portions 23.
- the low refractive index layer is an air layer AR. This eliminates the need for a special member for forming the low refractive index layer, and thus can cope with low cost.
- a reflection sheet 20 is disposed on the surface of the light guide 22 opposite to the light exit side as a reflection member that reflects light. In this way, the light reaching the surface opposite to the light emitting side in the light guide part 22 is reflected by the reflection sheet 20, so that the light can be efficiently propagated to the light emitting part 23.
- the reflection sheet 20 is formed over a range extending over the plurality of light guide portions 22. If it does in this way, compared with the case where a reflective sheet is divided
- Embodiment 2 A second embodiment of the present invention will be described with reference to FIGS. In this Embodiment 2, what changed the formation location of the light-scattering part 124 is shown. In addition, the overlapping description about the same structure, effect
- the light scattering portion 124 includes a back surface 22c of a portion of the light guide portion 22 that overlaps the light output portion 23 in a plan view, and a back surface 23b of the light output portion 23 in the non-connecting portion CN. And are formed respectively.
- the light scattering portion 124 formed on the back surface 22c of the portion of the light guide portion 22 that overlaps with the light output portion 23 in a plan view is sandwiched between the reflection sheet 20 and the light guide portion 22.
- the second reflection sheet 27 is attached to the back surface 23 b of the non-connecting part CN of the light exit part 23 via the light scattering part 124. Note that the distribution in the X-axis direction of the dots 124a forming the light scattering portion 124 is the same as that in the first embodiment described above, and therefore redundant description will be omitted.
- the light that has reached the portion of the light guide unit 22 that overlaps the light output unit 23 in plan view is divided into one that enters the light output unit 23 without hitting the light scattering unit 124 on the back surface 22 c and one that hits the light scattering unit 124.
- the light hitting the light scattering portion 124 on the back surface 22c is scattered there and reflected by the reflecting sheet 20 and enters the light exiting portion 23, so that it is emitted as it is from the light emitting surface 23a.
- the light that has entered the light exit part 23 without hitting the light scattering part 124 on the back surface 22c of the light guide part 22 hits the light scattering part 124 on the back surface 23b of the non-connecting part CN in the process of propagating through the light exit part 23.
- the light By being scattered and reflected by the second reflecting sheet 27, the light reaches the light emitting surface 23a and is emitted as it is.
- the third embodiment is a modification of the first embodiment, and shows a configuration in which a reflective layer 28 is added to improve the optical independence of each of the light guide members 19A to 19C.
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- a reflection layer 28 that reflects light over almost the entire area except for the light incident surface 22a and the light emitting surface 23a is provided on the outer peripheral surface of each light guide member 19A to 19C. Yes. That is, the reflective layer 28 is interposed between the adjacent light guide members 19A to 19C. Specifically, between the adjacent light guide portions 22A to 22C in the X-axis direction (FIGS. 19 to 21), Y Between the light guide portions 22A to 22C adjacent to each other in the axial direction (FIGS. 16 to 18), between the light exit portions 23A to 23C adjacent to each other in the X axis direction (FIGS.
- a reflective layer 28 is interposed between the light guide portions 22A to 22C and the light exit portions 23A to 23C (FIGS. 16 to 21) adjacent to each other in the Z-axis direction (FIGS. 16 to 18).
- the light incident from the LEDs 17 into the light guide members 19A to 19C propagates through the light guide portions 22A to 22C and reaches the light exit portions 23A to 23C, the light is scattered by the light scattering portion 24 on the light exit surface 23a.
- emission to the outside is promoted, but the light scattered by the light scattering unit 24 includes some of the light returned to the light output units 23A to 23C without being emitted to the outside.
- the returned light is reflected by the reflective layer 28 when it reaches the interface with the outside in the light outgoing portions 23A to 23C that propagate, and thus it is reliably avoided that it leaks outside.
- the light reflected by the reflective layer 28 propagates again in the light exit parts 23A to 23C or the light guide parts 22A to 22C and reaches the light exit surface 23a again, and is emitted. Even in the process of light propagating through the light guide portions 22A to 22C, the light is reflected by the reflective layer 28, so that the light can be reliably guided to the light exit portions 23A to 23C.
- the light is reliably prevented from leaking to the outside from each of the light exit portions 23A to 23C and the light guide portions 22 to 22C by the reflection layer 28, the light use efficiency can be improved and each light exit portion 23A can be improved.
- the amount of light emitted from ⁇ 23C can be maximized, and high luminance can be obtained.
- the optical independence of each of the light exit portions 23A to 23C can be made extremely high. .
- the reflective layer 28 that covers the outer peripheral surfaces of the light guide members 19A to 19C is provided, the reflective layer 22b described in the first embodiment is omitted.
- one light emitting unit is configured using three types of light guide members.
- one light emitting unit is configured using two types or four or more types of light guide members. You may make it comprise.
- one light emitting unit has four or more light emitting portions in parallel in the Y-axis direction, it is possible to easily cope with further enlargement of the screen. Is preferred.
- the light guide unit and the light output unit optically connected are arranged so as to overlap each other (in the Z-axis direction).
- the present invention also includes an arrangement in which the light-emitting portions connected to each other are not superposed on the front and back, but are arranged along the parallel direction (Y-axis direction) of the light-emitting portions.
- the first light guide portion and the second light guide portion have the first extension portion and the second extension portion, respectively. Either one or both of the second extending portions may be omitted.
- one LED is arranged corresponding to one light guide, but a plurality of LEDs are arranged corresponding to one light guide. What is done is also included in the present invention. In this way, it is possible to further increase the brightness.
- the light guide units adjacent in the X axis direction are optically connected to the light output units adjacent in the Y axis direction. It is also possible to arrange the light output portions optically connected to the light guide portions adjacent in the direction so as not to be adjacent in the Y-axis direction.
- the light emitting units are arranged in parallel along the Y-axis direction orthogonal to the X-axis direction, which is the parallel direction of the LEDs, but the light emitting units are arranged in the X-axis direction and the Y-axis. Those arranged in parallel in an oblique direction inclined with respect to both directions are also included in the present invention.
- the reflective layer is formed on the peripheral surface (excluding the light incident surface) of the light guide unit and the peripheral surface of the light output unit (excluding the light output surface).
- a reflection sheet separate from the light guide member may be provided.
- an air layer is interposed as a low refractive index layer between adjacent light guide members.
- a low refractive index layer made of a low refractive index material is adjacent to each other. What was interposed between the optical members is also included in the present invention.
- the air layer is interposed between the adjacent light guide members.
- the air layers are not spaced between the adjacent light guide members, they may be in close contact with each other. I do not care.
- the light scattering portion is obtained by printing dots made of light scattering particles on the light guide member, but other than that, for example, a rough formed by performing a blast process on the light guide member
- the surface can be a light scattering portion.
- a minute groove unevenness
- the light scattering portion is printed on the light guide member and integrated.
- the light scattering portion is printed on a separate film from the light guide member. You may make it affix a film on a light guide member.
- the light guide portion has a prismatic shape, but the specific shape can be changed.
- the light guide portion can be a cylindrical shape or an elliptical column shape. is there.
- the light emitting portion has a square shape when viewed in a plane, but the specific shape can be changed.
- the length and width are long.
- Different rectangular shapes, triangular shapes, circular shapes, elliptical shapes, and the like are also possible.
- the light guide unit and the light output unit are integrally formed.
- the light guide unit and the light output unit may be separate components. It is also possible to use an optical fiber or the like as the optical part. Moreover, it is also possible to fix the light guide unit and the light output unit as separate bodies and to integrate them with an adhesive or the like.
- the LED (LED substrate) is disposed at both ends on the long side of the backlight device.
- the LED is disposed on both ends on the short side of the backlight device. It is also possible.
- the present invention includes a backlight device in which an LED is disposed only at one end, and an LED disposed in three ends or all four ends.
- an LED using an LED chip that emits blue monochromatic light is used.
- an LED that incorporates an LED chip that emits purple monochromatic light can also be used.
- an LED incorporating three types of LED chips each emitting R, G, and B in a single color is also possible.
- the liquid crystal panel is illustrated in a vertically placed state in which the short side direction coincides with the vertical direction, but the liquid crystal panel matches the long side direction with the vertical direction. What is set in a vertical state is also included in the present invention.
- the TFT is used as the switching element of the liquid crystal display device.
- the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)), and color display.
- a switching element other than TFT for example, a thin film diode (TFD)
- color display for example, a liquid crystal display device
- the present invention can be applied to a liquid crystal display device that displays black and white.
- the liquid crystal display device using the 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 is exemplified, but the present invention is also applicable to a display device that does not include the tuner.
- SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 17 ... LED (light source), 18 ... LED board, 20 ... Reflective sheet (reflective member), 22 ... light guide, 22b ... reflective layer, 22A ... first light guide, 22B ... second light guide, 23 ... light exit, 23a ... light exit surface, 23A ... first light exit, 23B ... second light exit , 24 ... light scattering part, 25 ... first extension part (extension part), AR ... air layer (low refractive index layer), TV ... television receiver, U ... light emitting unit
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Abstract
Description
上記した特許文献1に記載されたものは、バックライト装置の端部に複数並列して配された光源と、光源からの光を導光して液晶パネル側に向けて出射させる導光板とを備えており、導光板は、光源の並列方向と直交する方向に沿って延在する形態とされるとともに光源の並列方向に沿って複数が並列配置されている。しかしながら、このものでは、隣り合う導光板間で発光の是非を制御することは可能であるものの、個々の導光板については、全体が発光するため、光源の並列方向と直交する方向について部分的に発光の是非を制御することができなかった。
本発明の照明装置は、端部において複数並列して配される光源と、前記光源の並列方向に沿って複数並列して配されるとともに前記光源からの光が入射される導光部と、前記光源の並列方向と交差する方向に沿って複数並列して配されるとともに前記導光部からの光を出射させる出光部とを備え、複数の前記出光部には、少なくとも相対的に前記光源側に配される第1出光部と、前記第1出光部よりも相対的に前記光源側とは反対側に配される第2出光部とが含まれるのに対し、複数の前記導光部には、少なくとも前記第1出光部に光学的に接続される第1導光部と、前記第2出光部に光学的に接続される第2導光部とが含まれている。
(1)前記出光部は、光学的に接続された前記導光部に対して光出射側に重畳するよう配されている。このようにすれば、仮に導光部と出光部とを出光部の並列方向に沿って並列させて互いに重畳させない場合に比べると、導光部の長さが大きなものとなる。従って、導光部内を伝播する光の光路長を十分に確保することができるとともに、出光部において広範囲に光を行き渡らせることができ、もって出光部に導入される光、並びに出光部から出射する光にムラが生じ難くなる。
本発明の実施形態1を図1~図12によって説明する。本実施形態では、液晶表示装置10について例示する。なお、各図面の一部にはX軸、Y軸及びZ軸を示しており、各軸方向が各図面で示した方向となるように描かれている。また、図3及び図4に示す上側を表側とし、同図下側を裏側とする。
本発明の実施形態2を図13~図15によって説明する。この実施形態2では、光散乱部124の形成箇所を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
本発明の実施形態3を図16~図21によって説明する。この実施形態3は、実施形態1の変形例というべきものであって、各導光部材19A~19Cの光学的独立性を向上させるべく反射層28を追加したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
(1)上記した各実施形態では、3種類の導光部材を用いて1つの発光ユニットを構成したものを示したが、2種類または4種類以上の導光部材を用いて1つの発光ユニットを構成するようにしてもよい。特に、導光部材を4種類以上とし、1つの発光ユニットがY軸方向について出光部を4つ以上並列して有する構成とすれば、一層の大画面化にも容易に対応することができて好適である。
Claims (23)
- 端部において複数並列して配される光源と、
前記光源の並列方向に沿って複数並列して配されるとともに前記光源からの光が入射される導光部と、
前記光源の並列方向と交差する方向に沿って複数並列して配されるとともに前記導光部からの光を出射させる出光部と、を備え、
複数の前記出光部には、少なくとも相対的に前記光源側に配される第1出光部と、前記第1出光部よりも相対的に前記光源側とは反対側に配される第2出光部とが含まれるのに対し、複数の前記導光部には、少なくとも前記第1出光部に光学的に接続される第1導光部と、前記第2出光部に光学的に接続される第2導光部とが含まれている照明装置。 - 前記出光部は、光学的に接続された前記導光部に対して光出射側に重畳するよう配されている請求項1記載の照明装置。
- 前記第1出光部は、前記第2出光部に光学的に接続される前記第2導光部に対して前記光出射側に重畳するよう配されている請求項2記載の照明装置。
- 前記出光部は、前記光源の並列方向と直交する方向に沿って複数並列して配されるとともに前記光源の並列方向についての寸法が互いにほぼ同一とされ、その大きさが複数の前記出光部にそれぞれ光学的に接続される前記導光部の各々の同寸法を足し合わせた大きさとほぼ一致するものとされる請求項3記載の照明装置。
- 少なくとも前記第1導光部には、前記第1出光部よりも前記光源側とは反対側に向けて延出する延出部が設けられている請求項2から請求項4のいずれか1項に記載の照明装置。
- 前記延出部には、前記第2出光部が前記光出射側に重畳するよう配されている請求項5記載の照明装置。
- 前記出光部には、光を出射させる光出射面が設けられており、前記光出射面には、光を散乱させる光散乱部が設けられている請求項2から請求項6のいずれか1項に記載の照明装置。
- 前記出光部は、前記光源の並列方向についての寸法が前記導光部よりも大きなものとされており、前記光散乱部は、その光の散乱度合いが前記導光部と重畳する部位よりも前記導光部とは重畳しない部位の方が大きくなるものとされる請求項7記載の照明装置。
- 前記光散乱部は、前記導光部から遠ざかる方向に向けて光散乱度合いが大きくなるものとされる請求項8記載の照明装置。
- 前記導光部のうち、前記光源と対向する端面とは反対側の端面には、光を反射させる反射層が形成されている請求項1から請求項9のいずれか1項に記載の照明装置。
- 前記導光部と前記出光部とが一体形成されている請求項1から請求項10のいずれか1項に記載の照明装置。
- 前記光源の並列方向について隣り合う前記導光部は、前記光源の並列方向と交差する方向について隣り合う前記出光部に対してそれぞれ光学的に接続されている請求項1から請求項11のいずれか1項に記載の照明装置。
- 前記光源の並列方向と交差する方向に並列する複数の前記出光部と、それら各出光部に対してそれぞれ光学的に接続された複数の前記導光部と、それら各導光部にそれぞれ光を供給する複数の前記光源とが1つの発光ユニットを構成しており、前記発光ユニットは、前記光源の並列方向に沿って複数並列して配されている請求項1から請求項12のいずれか1項に記載の照明装置。
- 前記光源の並列方向と交差する方向に並列する複数の前記出光部と、それら各出光部に対してそれぞれ光学的に接続された複数の前記導光部と、それら各導光部にそれぞれ光を供給する複数の前記光源とが1つの発光ユニットを構成しており、前記発光ユニットは、少なくとも一対が背中合わせ状に配されている請求項1から請求項13のいずれか1項に記載の照明装置。
- 前記光源は、LEDとされる請求項1から請求項14のいずれか1項に記載の照明装置。
- 前記LEDは、前記導光部の並列方向に沿って延在するLED基板に実装される請求項15記載の照明装置。
- 隣り合う前記導光部の間と、隣り合う前記出光部の間とには、前記導光部及び前記出光部よりも屈折率が低い低屈折率層がそれぞれ介在している請求項1から請求項16のいずれか1項に記載の照明装置。
- 前記低屈折率層は、空気層とされる請求項17記載の照明装置。
- 前記導光部のうち光出射側とは反対側の面には、光を反射させる反射部材が配されている請求項1から請求項18のいずれか1項に記載の照明装置。
- 前記反射部材は、複数の前記導光部に跨る範囲にわたって形成されている請求項19記載の照明装置。
- 請求項1から請求項20のいずれか1項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。
- 前記表示パネルは、一対の基板間に液晶を封入してなる液晶パネルとされる請求項21記載の表示装置。
- 請求項21または請求項22に記載された表示装置を備えるテレビ受信装置。
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JP2011540504A JP5337882B2 (ja) | 2009-11-10 | 2010-11-09 | 照明装置、表示装置、及びテレビ受信装置 |
EP10829919.9A EP2500625A4 (en) | 2009-11-10 | 2010-11-09 | LIGHTING DEVICE, DISPLAY DEVICE AND TELEVISION RECEIVER |
CN201080050261.4A CN102597604B (zh) | 2009-11-10 | 2010-11-09 | 照明装置、显示装置以及电视接收装置 |
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- 2010-11-09 WO PCT/JP2010/069903 patent/WO2011058960A1/ja active Application Filing
- 2010-11-09 CN CN201080050261.4A patent/CN102597604B/zh not_active Expired - Fee Related
- 2010-11-09 US US13/508,565 patent/US9016923B2/en not_active Expired - Fee Related
- 2010-11-09 EP EP10829919.9A patent/EP2500625A4/en not_active Withdrawn
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US11016240B2 (en) | 2017-02-22 | 2021-05-25 | Fujifilm Corporation | Light guide film and backlight unit |
Also Published As
Publication number | Publication date |
---|---|
JPWO2011058960A1 (ja) | 2013-04-04 |
CN102597604A (zh) | 2012-07-18 |
EP2500625A4 (en) | 2014-06-11 |
EP2500625A1 (en) | 2012-09-19 |
CN102597604B (zh) | 2014-03-26 |
JP5337882B2 (ja) | 2013-11-06 |
US20120224106A1 (en) | 2012-09-06 |
US9016923B2 (en) | 2015-04-28 |
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