WO2010061676A1 - 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
- Publication number
- WO2010061676A1 WO2010061676A1 PCT/JP2009/065568 JP2009065568W WO2010061676A1 WO 2010061676 A1 WO2010061676 A1 WO 2010061676A1 JP 2009065568 W JP2009065568 W JP 2009065568W WO 2010061676 A1 WO2010061676 A1 WO 2010061676A1
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- WIPO (PCT)
- Prior art keywords
- light
- light guide
- led
- guide plate
- incident surface
- Prior art date
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Classifications
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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
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/46—Fixing elements
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light.
- Patent Document 1 As an example of a thin liquid crystal display device, one described in Patent Document 1 below is known.
- This is an LED having a light emitting surface that emits light in a direction substantially parallel to the display surface of the liquid crystal panel, and a light incident surface on the side edge (side edge) that faces the LED and receives light from the LED.
- a light guide plate each having a light emitting surface for emitting light toward the display surface of the liquid crystal panel.
- a scattering pattern that scatters light and a reflection sheet that reflects light are formed on the lower surface of the light guide plate, that is, the surface opposite to the light emitting surface.
- the brightness distribution is made uniform.
- the present invention has been completed based on the above-described circumstances, and an object thereof is to stabilize luminance in a lighting device. It is another object of the present invention to provide a display device including a lighting device that realizes such luminance stabilization, and further a television receiver.
- the illuminating device of the present invention is parallel to the light source, the light incident surface arranged to face the light source and receiving light from the light source, and the alignment direction of the light source and the light incident surface.
- a light guide having a light emitting surface for emitting light, a base to which the light source and the light guide are fixed, and for fixing the light guide to the base,
- a fixing member disposed at a position near the light incident surface with respect to an arrangement direction of the light source and the light incident surface.
- the light guide body When the temperature environment in the lighting device is changed by turning on or off the light source, the light guide body is thermally expanded or contracted accordingly. At this time, the light guide body thermally expands or contracts with the fixing position of the fixing member with respect to the base material as a base point. Therefore, by arranging the fixing member in the vicinity of the light incident surface with respect to the alignment direction of the light source and the light incident surface, the light incident surface with respect to the light source with respect to the alignment direction even if thermal expansion or contraction occurs in the light guide. It is possible to suppress a change in the relative positional relationship of. Accordingly, the incident efficiency of light from the light source with respect to the light guide can be stabilized.
- the “near position” described above is a position where a change in the positional relationship of the light incident surface with respect to the light source due to thermal expansion or contraction of the light guide does not adversely affect the light guide.
- the fixing member is arranged in a range from the light incident surface to an end portion of the light source opposite to the light incident surface side in the arrangement direction. By disposing the fixing member in the above range, it is possible to suitably prevent the relative positional relationship of the light incident surface with respect to the light source from changing with respect to the arrangement direction of the light source and the light incident surface.
- the fixing member is arranged in a range from the light incident surface to a light emitting surface of the light source facing the light incident surface in the arrangement direction.
- the fixing member is arranged at a position coinciding with the light incident surface with respect to the arrangement direction. In this way, there is almost no change in the relative positional relationship of the light incident surface with respect to the light source with respect to the arrangement direction of the light source and the light incident surface, and the light incident efficiency with respect to the light incident surface can be extremely stable. .
- the fixing member is disposed on the light source side with respect to the light incident surface. If it does in this way, it can prevent that a fixing member becomes optical obstruction with respect to the light which injected into the light-incidence surface. Thereby, the brightness
- a pair of the fixing members are arranged at side positions sandwiching the light source in a direction parallel to the light emitting surface and intersecting the arrangement direction.
- the light guide can be stably fixed by arranging the pair of fixing members at the side positions sandwiching the light source, and the light source and the light incident surface with respect to the alignment direction of the light incident surface can be fixed. The positional relationship of the light incident surface can be further stabilized.
- the pair of fixing members are arranged at substantially the same position in the arrangement direction. In this way, the light guide can be more stably fixed, and the positional relationship of the light incident surface with respect to the light source can be further stabilized.
- a plurality of the light sources and the light guides are arranged in parallel. In this way, since the luminance of each light guide is stabilized, luminance unevenness can hardly occur in the entire lighting device.
- the light source and the light guide are arranged two-dimensionally in parallel. If it does in this way, since the light-projection surface in each light guide will be paralleled two-dimensionally, brightness nonuniformity can be made harder to arise in the whole said illuminating device.
- a reflection member that reflects light toward the light emission surface is provided on a surface of the light guide opposite to the light emission surface, and the fixing member is adjacent to the light guide. Covered by the reflective member of the body. In this way, since it is possible to prevent the fixing member from being visually recognized from the light emitting surface side, it is possible to further prevent luminance unevenness from occurring in the entire lighting device.
- the fixing member passes through an insertion hole formed in the light guide and parallel to the light emitting surface with respect to the light incident surface and arranged at a lateral position in a direction intersecting the arrangement direction. It is attached in the state. If an insertion hole is formed in the light guide and a fixing member is passed therethrough, the fixing member may optically interfere with the light in the light guide. By arranging them at the lateral positions, the above problems can be solved and the luminance of the light guide can be stabilized.
- the fixing member is formed on the insertion hole and the base material protruding from the mounting portion to the base material side with an attachment portion disposed on the side opposite to the base material side with respect to the light guide.
- the insertion portion constituting the fixing member penetrates the light guide and the base material, and the fixing is performed in a state where the light guide body and the base material are sandwiched between the attachment portion and the locking portion. Therefore, stable fixation can be expected.
- the light guide is provided with a housing recess for housing the mounting portion. In this way, since the attachment portion is accommodated in the accommodation recess, the entire lighting device can be reduced in thickness.
- the fixing member is a locking piece that is provided integrally with the base material and can be locked to a locked portion formed in the light guide. If it does in this way, since a light guide can be fixed by the locking piece integrally provided in the base material, stable fixation can be aimed at. In addition, by providing the locking piece as the fixing member integrally with the base material, it is possible to reduce the number of parts as compared with a case where the locking piece is provided separately.
- the base material is a circuit board on which the light source is mounted.
- the positional relationship between the light source and the light incident surface can be stabilized by fixing the light guide with the fixing member to the circuit board on which the light source is mounted.
- the light guide includes a substrate attachment portion attached to the circuit board, a light guide portion that guides light incident from the light incident surface, and the light exit surface, and the light guide portion. And a light output part for emitting light from the outside to the outside.
- the light guide tends to be elongated in the direction in which the light source and the light incident surface are aligned, and the amount of expansion or contraction during thermal expansion or thermal contraction tends to increase, which is particularly suitable.
- the light source is a light emitting diode surface-mounted on the circuit board. In this way, it is possible to increase the brightness.
- 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.
- 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.
- the luminance can be stabilized in the lighting device.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- Sectional drawing which expands and shows the light-guide plate in FIG. Plan view showing the arrangement of the light guide plates Top view of the light guide plate Bottom view of light guide plate The top view which expands and shows the LED vicinity of the light-guide plate in FIG. The top view which expands and shows LED vicinity of the light-guide plate which concerns on Embodiment 2 of this invention. The top view which expands and shows LED vicinity of the light-guide plate which concerns on Embodiment 3 of this invention. The top view which expands and shows LED vicinity of the light-guide plate which concerns on Embodiment 4 of this invention.
- SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 16 ... LED (light source, light emitting diode), 16a ... Light emission surface, 16f ... Rear end surface (light) End portion on the side opposite to the incident surface side), 17 ... LED substrate (base material, circuit board), 18 ... Light guide plate (light guide), 23 ... Clip (fixing member), 23a ... Mounting plate (mounting portion) , 23b ... insertion part, 23c ... locking piece (locking part), 24 ... reflection sheet (reflective member), 25 ... locking piece, 30 ... substrate mounting part, 31 ...
- 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 FIGS. 4 to 10 is the front side, and the lower side is the back side.
- the television receiver TV includes a liquid crystal display device 10 (display device), front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and a power source P.
- a tuner T is provided, and the display surface 11a is supported by the stand S along the vertical direction (Y-axis direction).
- the liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 11 as a display panel and a backlight device 12 (illumination device) as an external light source, as shown in FIG. It is integrally held by a bezel 13 or the like having a shape.
- the display surface 11a is along the vertical direction” is not limited to an aspect in which the display surface 11a is parallel to the vertical direction, and the display surface 11a is installed in a direction along the vertical direction relative to the direction along the horizontal direction.
- it is meant to include those inclined at 0 ° to 45 °, preferably 0 ° to 30 ° with respect to the vertical direction.
- the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially.
- the liquid crystal panel (display 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 outside both substrates (see FIG. 5 and the like).
- the backlight device 12 roughly includes a chassis 14 having a substantially box shape opened on the front side (the liquid crystal panel 11 side, the light emitting side), and an opening of the chassis 14.
- An optical member 15 disposed, an LED 16 (Light Emitting Diode) as a light source disposed in the chassis 14, an LED board 17 on which the LED 16 is mounted, and light emitted from the LED 16 toward the optical member 15 side.
- a light guide plate 18 for guiding.
- the backlight device 12 is generated in association with the light emission of the LED 16, the receiving member 19 that receives the diffusion plates 15 a and 15 b constituting the optical member 15 from the back side, the pressing member 20 that presses the diffusion plates 15 a and 15 b from the front side. And a heat dissipating member 21 for promoting heat dissipation.
- the backlight device 12 has a configuration in which the LEDs 16 are arranged on the side end portion (side edge) of the light guide plate 18 and a large number of unit light emitters composed of a set of the LED 16 and the light guide plate 18 arranged in parallel with each other are arranged in parallel.
- a large number of unit light emitters (20 in FIG. 3) are juxtaposed along the parallel direction (Y-axis direction) of the LED 16 and the light guide plate 18 and arranged in tandem (see FIG. 3). 7 to 9).
- the backlight device 12 includes a large number of unit light emitters arranged in tandem in a direction substantially perpendicular to the tandem arrangement direction (Y-axis direction) and along the display surface 11a (X-axis direction).
- the chassis 14 is made of metal, and as shown in FIG. 4, the bottom plate 14a has a rectangular shape, the side plate 14b rises from the outer end of each side of the bottom plate 14a, and the rising end of each side plate 14b. And a receiving plate 14c projecting outward from the bottom, and as a whole, has a shallow substantially box shape (substantially shallow dish shape) opened toward the front side.
- the long side direction of the chassis 14 coincides with the horizontal direction (X-axis direction), and the short side direction coincides with the vertical direction (Y-axis direction).
- a receiving member 19 and a pressing member 20 can be placed on each receiving plate 14c in the chassis 14 from the front side.
- Each receiving plate 14c is formed with a mounting hole 14d for screwing the bezel 13, the receiving member 19 and the pressing member 20 at a predetermined position, one of which is shown in FIG. Further, the long side receiving plate 14c is folded back so that the outer edge portion thereof is parallel to the side plate 14b (FIG. 4).
- an insertion hole 14e for passing a clip 23 for attaching the light guide plate 18 is formed through the bottom plate 14a at a predetermined position (FIGS. 5 and 6). Note that a mounting hole (not shown) for screwing the LED board 17 is formed through the bottom plate 14a at a predetermined position.
- the optical member 15 is interposed between the liquid crystal panel 11 and the light guide plate 18, and is disposed on the liquid crystal panel 11 side with diffusion plates 15 a and 15 b disposed on the light guide plate 18 side. And an optical sheet 15c.
- the diffusing plates 15a and 15b have a configuration in which a large number of diffusing particles are dispersed in a transparent resin base material having a predetermined thickness, and have a function of diffusing transmitted light.
- Two diffuser plates 15a and 15b having the same thickness are stacked and arranged.
- the optical sheet 15c has a sheet shape that is thinner than the diffusion plates 15a and 15b, and three optical sheets are laminated. Specifically, the optical sheet 15c is a diffusion sheet, a lens sheet, and a reflective polarizing sheet in order from the diffusion plates 15a and 15b side (back side).
- the receiving member 19 is arranged on the outer peripheral end of the chassis 14 and can receive the outer peripheral end of the diffusion plates 15a and 15b over substantially the entire periphery. As shown in FIG. 3, the receiving member 19 includes a pair of short side receiving members 19 ⁇ / b> A extending along each short side portion of the chassis 14, and two long side sides extending along each long side portion. It has receiving members 19B and 19C. Each receiving member 19 has a different form depending on each installation location. When the receiving members 19 are distinguished, the suffixes A to C are added to the symbols of the receiving members, respectively, and when the generic names are not distinguished, the suffix is not added to the symbols. .
- both short side receiving members 19A have substantially the same structure, and both have a substantially L-shaped cross section extending along the inner wall surfaces of the short side receiving plate 14c and the side plate 14b. I am doing. Of the portions parallel to the receiving plate 14c in both the short side receiving members 19A, the inner portion receives the back diffusion plate 15b, while the outer portion receives a short side pressing member 20A described later. Further, both short side receiving members 19A cover the short side receiving plate 14c and side plate 14b over substantially the entire length.
- the long side receiving members 19B and 19C are different from each other.
- the first long side receiving member 19B disposed on the lower side (vertical direction lower side) shown in FIG. 3 in the chassis 14 is, as shown in FIG. 7, the inner wall surface of the long side receiving plate 14c, And it is set as the form extended along the surface (surface on the opposite side to the LED board 17 side) of the light guide plate 18 adjacent to it. That is, the first long side receiving member 19B has a function of pressing the adjacent light guide plate 18 from the front side.
- the inner end receives the front diffusion plate 15a, while the outer portion receives a first long side pressing member 20B described later.
- a step portion 19Ba adapted to the outer edge of the front diffusion plate 15a is formed at the inner end of the first long side receiving member 19B.
- a recess 19Bb that receives the protrusion 20Bc of the first long side pressing member 20B is formed at a position adjacent to the outside of the step portion 19Ba in the first long side receiving member 19B.
- the first long side receiving member 19B covers the long side receiving plate 14c and the non-light emitting portions (the substrate mounting portion 30 and the light guiding portion 32) of each light guide plate 18 adjacent thereto over almost the entire length.
- the width of the first long side receiving member 19B is wider than the other receiving members 19A and 19C to cover the non-light emitting portion of the light guide plate 18.
- the second long side receiving member 19C disposed on the upper side (vertical upper side) shown in FIG. 3 in the chassis 14 extends along the inner wall surfaces of the receiving plate 14c, the side plate 14b, and the bottom plate 14a, as shown in FIG.
- the existing cross section has a substantially crank shape.
- a portion parallel to the receiving plate 14c is formed by knocking out a diffusion plate receiving projection 19Ca having a substantially arc-shaped cross section protruding toward the front side. It abuts against the plate 15b from the back side.
- the second long side receiving member 19C a portion parallel to the bottom plate 14a is formed with a light guide plate receiving protrusion 19Cb having a substantially arc-shaped cross section protruding toward the front side.
- the light guide plate 18 is contacted from the back side. That is, the second long side receiving member 19 ⁇ / b> C has both a function of receiving (supporting) the diffusion plates 15 a and 15 b and a function of receiving the light guide plate 18.
- a portion of the second long side receiving member 19C that is parallel to the receiving plate 14c and that is inward of the diffusion plate receiving protrusion 19Ca is in contact with the front end of the light guide plate 18 from the back side.
- the light guide plate 18 can be supported at two points together with the light guide plate receiving protrusion 19 ⁇ / b> Cb that abuts the base side portion of the light guide plate 18.
- the second long side receiving member 19C is configured to cover the long side receiving plate 14c and the side plate 14b over substantially the entire length.
- a projecting piece 19Cc facing the end surfaces of both diffusion plates 15a, 15b is formed to rise from the outer end of the second long side receiving member 19C.
- the holding member 20 is disposed at the outer peripheral end of the chassis 14, and the width dimension thereof is sufficiently smaller than the short side dimension of the chassis 14 and the diffusion plates 15 a and 15 b, so that the diffusion plate 15 a It is possible to locally press the outer peripheral end.
- the holding member 20 includes a short side holding member 20A arranged one by one on both short sides of the chassis 14 and a plurality of long side holding members 20B, 20C arranged on both long sides. Yes.
- Each pressing member 20 has a different form depending on each installation location.
- suffixes A to C are attached to the reference numerals of the pressing members, respectively, and when referring generically without distinction, the suffix is not attached to the reference sign. .
- Both short-side holding members 20A are arranged at substantially the center position of both short-side portions of the chassis 14, and are screwed in a state of being placed on the outer end portions of both short-side receiving members 19A. .
- both short-side holding members 20 ⁇ / b> A have holding pieces 20 ⁇ / b> Aa that protrude inward from the screwed main body portion, and the diffusion plate is formed by the tip of the holding pieces 20 ⁇ / b> Aa.
- 15a can be pressed from the front side.
- the liquid crystal panel 11 is placed on the pressing piece from the front side, and the liquid crystal panel 11 can be held between the presser piece and the bezel 13. Further, a buffer material 20Ab for the liquid crystal panel 11 is disposed on the front side surface of the pressing piece 20Aa.
- the long side pressing members 20B and 20C are different from each other.
- the first long side pressing member 20B disposed on the lower side (vertical direction lower side) shown in FIG. 3 in the chassis 14 is, as shown in FIG. Are arranged at approximately equal intervals at three positions of the substantially central position and the both side positions, and are screwed in a state of being placed on the outer end portion of the first long side receiving member 19B.
- the first long side pressing member 20B has a pressing piece 20Ba on the inner end side, like the short side pressing member 20A, and the back side surface of the pressing piece 20Ba is The diffusion plate 15a is pressed down, and the front surface can receive the liquid crystal panel 11 via the buffer material 20Bb.
- first long side pressing member 20B has a larger width dimension than the other pressing members 20A and 20C so as to be compatible with the first long side receiving member 19B, and on the back side, A projection 20Bc is provided for positioning with respect to the first long side receiving member 19B.
- the second long side pressing member 20 ⁇ / b> C disposed on the upper side (vertical direction upper side) shown in FIG. 3 in the chassis 14 is centered in the X-axis direction in the long side portion on the upper side in FIG. Are arranged at two positions shifted to the left and right in the figure, and are screwed in a state of being placed directly on the receiving plate 14c of the chassis 14.
- the second long side pressing member 20C has a pressing piece 20Ca on the inner end side, like the short side pressing member 20A and the first long side pressing member 20B.
- the back side surface of the pressing piece 20Ca presses the diffusion plate 15a, and the front side surface can receive the liquid crystal panel 11 via the cushioning material 20Cb.
- a cushioning material 20Cc different from the above is interposed between the pressing piece 20Ca and the bezel 13 in the second long side pressing member 20C.
- the heat dissipating member 21 is made of a synthetic resin material or a metal material having excellent heat conductivity and has a sheet shape. As shown in FIGS. There is something to be arranged. Of the heat dissipating member 21, the one disposed in the chassis 14 is interposed between the bottom plate 14 a of the chassis 14 and the LED substrate 17, and is provided with notches for allowing other members to escape. On the other hand, the heat radiating member 21 disposed outside the chassis 14 is attached to the back surface of the bottom plate 14 a of the chassis 14.
- the LED 16 is a so-called surface mount type that is surface mounted on the LED substrate 17 as shown in FIG.
- the LED 16 has a horizontally long and substantially block shape as a whole, and is a side light emitting type in which a side surface adjacent to a mounting surface (a bottom surface in contact with the LED substrate 17) with respect to the LED substrate 17 is a light emitting surface 16a.
- the optical axis LA of the LED 16 is set to be substantially parallel to the display surface 11a of the liquid crystal panel 11 (the light emitting surface 36 of the light guide plate 18) (FIGS. 7 and 10).
- the optical axis LA of the LED 16 coincides with the short side direction (Y-axis direction) of the chassis 14, that is, the vertical direction, and the light emission direction (light emission direction from the light emitting surface 16a) is upward in the vertical direction. (FIGS. 3 and 7).
- the light emitted from the LED 16 spreads radially to some extent within a predetermined angle range around the optical axis LA, but its directivity is higher than that of a cold cathode tube or the like. That is, the light emission intensity of the LED 16 exhibits an angular distribution in which the direction along the optical axis LA is conspicuously high and rapidly decreases as the tilt angle with respect to the optical axis LA increases.
- the longitudinal direction of the LED 16 coincides with the long side direction (X-axis direction) of the chassis 14.
- the LED 16 has a plurality of LED chips 16c, which are light emitting elements, mounted on a substrate portion 16b disposed on the opposite side (back side) of the light emitting surface 16a, and is surrounded by a housing 16d and is enclosed in the housing 16d. The space is sealed with the resin material 16e.
- the LED 16 includes three types of LED chips 16c having different main emission wavelengths. Specifically, each LED chip 16c emits R (red), G (green), and B (blue) in a single color. It has become. Each LED chip 16 c is arranged in parallel along the longitudinal direction of the LED 16.
- the housing 16d has a horizontally long and substantially cylindrical shape exhibiting white with excellent light reflectivity. Further, the back surface of the substrate portion 16b is soldered to the land on the LED substrate 17.
- the LED substrate 17 is made of a synthetic resin whose surface (including the surface facing the light guide plate 18) is white with excellent light reflectivity. As shown in FIG. 3, the LED substrate 17 has a rectangular plate shape in plan view, and its long side dimension is set to be sufficiently smaller than the short side dimension of the bottom plate 14a. It is possible to partially cover the bottom plate 14a.
- a plurality of LED substrates 17 are arranged in a plane in a grid pattern in the plane of the bottom plate 14 a of the chassis 14. Specifically, in FIG. 3, a total of 25 LED substrates 17 are arranged in parallel, 5 in the long side direction of the chassis 14 and 5 in the short side direction.
- a wiring pattern made of a metal film is formed on the LED substrate 17 and the LED 16 is mounted at a predetermined position.
- An external control board (not shown) is connected to the LED board 17, and power necessary for lighting the LED 16 is supplied from the LED board 17, and drive control of the LED 16 is possible.
- a large number of LEDs 16 are arranged in a grid pattern on the LED substrate 17, and the arrangement pitch thereof corresponds to the arrangement pitch of light guide plates 18 described later. Specifically, a total of 32 LEDs 16 are arranged in parallel, 8 in the long side direction and 4 in the short side direction on the LED substrate 17.
- a photo sensor 22 is mounted on the LED substrate 17, and by detecting the light emission state of each LED 16 by the photo sensor 22, each LED 16 can be feedback controlled (FIG. 4). And FIG. 11).
- the mounting surface of the LED 16 and the photosensor 22 on the LED substrate 17 is a plate surface parallel to the light emitting surface 36 of the light guide plate 18.
- the LED board 17 has an attachment hole 17a (FIG. 6) for receiving the clip 23 for attaching the light guide plate 18 and a positioning hole 17b (FIG. 10) for positioning the light guide plate 18, respectively. are provided according to the mounting position.
- the light guide plate 18 is made of a synthetic resin material (for example, polycarbonate) having a refractive index sufficiently higher than that of air and substantially transparent (excellent translucency). As shown in FIGS. 7 to 9, the light guide plate 18 introduces light emitted from the LEDs 16 in the vertical direction (Y-axis direction) and propagates the light inside (ZZ side) (Z It has a function of rising and emitting in the direction of the axial direction. As shown in FIG.
- the light guide plate 18 is formed in a plate shape having a rectangular shape in plan view as a whole, and its long side direction is the optical axis LA (light emission direction) of the LED 16 and the short side direction of the chassis 14 ( The short side direction is parallel to the long side direction (X axis direction, horizontal direction) of the chassis 14.
- the cross-sectional structure along the long side direction in the light guide plate 18 will be described in detail.
- the light guide plate 18 has one end side (the LED 16 side) in the long side direction serving as a board mounting portion 30 attached to the LED board 17, whereas the other end in the long side direction.
- the light emitting part 31 is capable of emitting light toward the diffuser plates 15a and 15b, and the light emitting part 31 emits light with little light exiting between the substrate mounting part 30 and the light emitting part 31. It is set as the light guide part 32 which can be led to.
- the board mounting part 30 (LED 16), the light guide part 32, and the light output part 31 are in the long side direction of the light guide plate 18, that is, the optical axis LA of the LED 16 (light emission direction, the direction in which the LED 16 and the light incident surface 34 are aligned). It can be said that the LED 16 is arranged in parallel sequentially from the LED 16 side.
- the substrate mounting portion 30 and the light guide portion 32 are non-light emitting portions, whereas the light output portion 31 is a light emitting portion.
- the direction from the board mounting part 30 toward the light emitting part 31 is forward, and conversely, the direction from the light emitting part 31 toward the board mounting part 30 (see FIG. The description will be made assuming that the left direction in FIGS.
- An LED housing hole 33 for housing the LED 16 is formed through the Z-axis direction at the front end position of the board mounting portion 30, and a surface (front surface) of the inner peripheral surface facing the light emitting surface 16 a of the LED 16 is formed.
- a light incident surface 34 on which light from the LED 16 is incident is formed.
- the light incident surface 34 is disposed at the boundary position between the substrate mounting portion 30 and the light guide portion 32.
- the outer peripheral surface of the light guide portion 32 is substantially smooth over the entire area, and light is not diffusely reflected at the interface (interface with the external air layer). Since the incident angle with respect to the interface almost exceeds the critical angle, the light is guided to the light output portion 31 side while repeating total reflection.
- each LED chip 16c constituting the LED 16 emits R, G, B monochromatic light.
- the three monochromatic lights are mixed with each other.
- the white light is led to the light output unit 31.
- the light guide 32 is inserted into the positioning hole 17b of the LED board 17 at a position near the board mounting part 30 (near the rear end part), so that the X axis direction and the Y axis direction with respect to the LED board 17
- a positioning projection 35 capable of positioning the light guide plate 18 is provided so as to protrude to the back side.
- the light emitting surface 36 is a surface facing the front side of the light emitting portion 31, that is, almost the entire surface facing the diffusion plate 15 b.
- the light exit surface 36 is a substantially smooth surface and is substantially parallel to the plate surfaces of the diffusion plates 15a and 15b (the display surface 11a of the liquid crystal panel 11), and is substantially orthogonal to the light incident surface 34. Yes.
- a scattering surface that scatters light at the interface by applying a fine unevenness to the back surface (the surface opposite to the light emitting surface 36, the surface facing the LED substrate 17) of the light emitting portion 31. 37 is formed.
- the scattering surface 37 is formed by arranging a large number of grooves 37 a extending linearly along the short side direction of the light guide plate 18 at predetermined intervals, and the arrangement pitch (arrangement interval) of the grooves 37 a is the rear end of the light emitting unit 31. As it goes from the front end side to the front end side (front end side), it gradually becomes narrower (FIG. 13).
- the groove 37a constituting the scattering surface 37 has a lower density on the rear end side, that is, the side where the distance from the LED 16 is smaller (closer side), and is higher on the front end side, that is, the side where the distance from the LED 16 is larger (the far side). They are arranged so as to have a density, which is a gradation arrangement. Thereby, for example, it is possible to prevent a luminance difference from occurring between the side where the distance from the LED 16 is small and the side where the distance is large in the light emitting part 31, and a uniform luminance distribution can be obtained in the plane of the light emitting surface 36. It has become.
- the scattering surface 37 is provided over almost the entire area of the light output part 31, and the almost entire area overlaps with the light emitting surface 36 in a plan view.
- a reflection sheet 24 that reflects light toward the inside of the light guide plate 18 is disposed on the back side surfaces (including the scattering surface 37) of the light output unit 31 and the light guide unit 32.
- the reflection sheet 24 is made of a synthetic resin having a white surface with excellent light reflectivity, and is disposed in a region corresponding to substantially the entire area of the light output portion 31 and the light guide portion 32 when viewed in plan ( FIG. 13).
- the reflection sheet 24 can reliably prevent light propagating in the light guide plate 18 from leaking to the back side, and can efficiently raise the light scattered on the scattering surface 37 to the light emitting surface 36 side. it can.
- the reflection sheet 24 is bonded to the light guide plate 18 by a transparent adhesive at a plurality of positions on the side end positions, that is, positions where it is difficult to optically interfere with the light propagating in the light guide plate 18. Further, the reflection sheet 24 is provided with a hole through which the positioning protrusion 35 is passed at a position corresponding to the positioning protrusion 35. In addition, since the side end surface and the front end surface (front end surface) in the light output part 31 are also smooth surfaces similar to the light guide part 32, almost no leakage light is generated.
- the front side surface (including the surface facing the diffusion plates 15 a and 15 b and the light emitting surface 36) and the back side surface (facing the LED substrate 17) of the light guide plate 18 are respectively X Parallel surfaces 38 and 41 that are substantially parallel to the axial direction and the Y-axis direction (display surface 11a) and inclined surfaces 39 and 40 that are inclined with respect to the X-axis direction and the Z-axis direction are formed.
- the back surface of the substrate mounting portion 30 is a mounting surface for the LED substrate 17 and is a parallel surface 38 (a surface parallel to the main plate surface of the LED substrate 17) in order to stabilize the mounting state.
- the back surface of the light guide unit 32 and the light output unit 31 is a continuous inclined surface 39. Therefore, among the light guide plates 18, the substrate mounting portion 30 is fixed in contact with the LED substrate 17, but the light guide portion 32 and the light output portion 31 are lifted from the LED substrate 17, and the LED substrate 17 is in a non-contact state. That is, the light guide plate 18 is supported in a cantilevered manner with the substrate attachment portion 30 on the rear end side as a base end (fulcrum) and the front end side as a free end.
- the surface on the front side of the entire area of the substrate mounting portion 30 and the light guide portion 32 and the portion of the light output portion 31 near the light guide portion 32 is a continuous inclined surface 40. Since this inclined surface 40 is substantially parallel to each other at substantially the same inclination angle as the inclined surface 39 on the back side, the entire area of the light guide portion 32 and the portion near the light guide portion 32 (side closer to the LED 16) in the light output portion 31 are plate thickness Is almost constant.
- the surface on the front side of the light emitting portion 31 near the front end is a parallel surface 41.
- the light exit surface 36 includes a parallel surface 41 and an inclined surface 40, the most part near the front end is the parallel surface 41, and a part near the light guide part 32 is the inclined surface 40.
- the board attachment portion 30 has a tapered shape in which the plate thickness gradually decreases as it goes to the rear end side (as it moves away from the light guide portion 32).
- the light exiting portion 31 has a constant thickness because the surface on the front side is the inclined surface 40 for the portion adjacent to the light guide portion 32, but the surface on the front side is a parallel surface 41 for the front portion. Therefore, it has a tapered shape in which the plate thickness gradually decreases as it goes to the front end side (as it moves away from the light guide portion 32).
- the front-side parallel surface 41 has a length dimension (dimension in the Y-axis direction) shorter than the back-side parallel surface 38. Therefore, the front end portion of the light exiting portion 31 has a thickness dimension smaller than that of the rear end portion of the substrate mounting portion 30, and the front end surface (front end surface) of the light exiting portion 31 has a surface area larger than that of the rear end surface of the substrate mounting portion 30. It is getting smaller.
- the outer peripheral end surface (including both side end surfaces and the front end surface) of the light guide plate 18 is a vertical end surface that is substantially straight along the Z-axis direction over the entire region.
- the light guide plate 18 having the above-described cross-sectional structure has a pair of LED housing holes 33 for housing the LEDs 16 as shown in FIG. 12, and light from two different LEDs 16 is incident on it. Regardless, the light emitted from each LED 16 can be guided to the diffusion plates 15a and 15b in an optically independent state.
- FIG. 12 it explains in detail with the plane arrangement of each composition part in light guide plate 18.
- the light guide plate 18 has a symmetrical shape centered on a symmetrical axis passing through the center position in the short side direction (X-axis direction).
- a pair of LED receiving holes 33 of the board mounting portion 30 are disposed symmetrically at positions shifted by a predetermined distance from the center position in the short side direction (X-axis direction) of the light guide plate 18.
- Each LED accommodation hole 33 has a substantially rectangular shape that is horizontally long when seen in a plan view, and is slightly larger than the outer shape of the LED 16.
- the LED housing hole 33 has a height dimension (dimension in the Z-axis direction) and a width dimension (dimension in the X-axis direction) that is slightly larger than that of the LED 16, and the surface area of the light incident surface 34 is larger than that of the light emitting surface 16 a of the LED 16. Is sufficiently large so that the radial light emitted from the LED 16 can be taken in without any excess.
- a slit 42 that divides the light guide part 32 and the light output part 31 into right and left is provided at the center position in the short side direction of the light guide plate 18.
- the slit 42 penetrates the light guide plate 18 in the thickness direction (Z-axis direction) and has a constant width in a form that opens forward along the Y-axis direction.
- the end face of the light guide plate 18 facing the slit 42 constitutes side end faces of the divided light guide portions 32S and the divided light output portions 31S, and is a substantially smooth surface that is substantially straight along the Z-axis direction.
- the light in the light guide plate 18 is totally reflected at the interface with the air layer of the slit 42 at the end face facing the slit 42, the light is transmitted between the divided light guide sections 32S and the divided light output sections 31S facing each other across the slit 42. Is prevented from coming and going and mixing. Thereby, the optical independence in each division
- the rear end position of the slit 42 is slightly forward of the positioning protrusion 35 and the irradiation area in the X-axis direction of each LED 16 (the angle range between the alternate long and short dash lines around the optical axis LA of the LED 16 shown in FIG. ) Is set behind.
- the pair of positioning projections 35 are located behind the irradiation region in the X-axis direction of each LED 16 at the outer end of the divided light guide 32S (the end opposite to the slit 42) in the same manner as the slit 42. It is symmetrically arranged in the position of the side, and it is avoided that the positioning protrusion 35 becomes an optical obstruction.
- the formation range of the slits 42 does not extend to the board mounting part 30, and both split light guide parts 32 ⁇ / b> S are connected to the common board mounting part 30, so that mechanical stability is ensured. ing.
- the light guide plate 18 is optically independent from each other, and two unit light guide plates (a divided light guide portion 32S and a divided light output portion 31S) individually corresponding to each LED 16 are provided by the substrate mounting portion 30.
- the workability of attaching the light guide plate 18 to the LED substrate 17 is ensured.
- the reflective sheet 24 is extended in the form which straddles the slit 42 (FIG. 13).
- Both insertion holes 43 are arranged so that the two LED housing holes 33 on the center side and the two LEDs 16 housed therein are arranged in the X-axis direction (parallel to the light emitting surface 36 and orthogonal to the alignment direction of the LED 16 and the light incident surface 34. It can be said that it is arranged so as to be sandwiched from both sides.
- Both insertion holes 43 are disposed at substantially the same position in the front-rear direction.
- the clip 23 projects to the LED board 17 side along the plate thickness direction (Z-axis direction) of the board mounting portion 30 from the mounting plate 23 a parallel to the board mounting portion 30. It is comprised from the insertion part 23b and a pair of latching piece 23c which protrudes in the shape of folding from the front-end
- the insertion portion 23b is inserted into the insertion hole 43 of the substrate attachment portion 30 and the attachment hole 17a of the LED substrate 17, and the locking piece 23c is located on the back side (the opposite side to the attachment plate 23a) of the attachment hole 17a. ),
- the light guide plate 18 can be fixed to the LED substrate 17 in an attached state.
- the light guide plate 18 is fixed by the two insertion portions 23b inserted into the two insertion holes 43 at two positions separated from each other in the short side direction (X-axis direction). There is no rotational displacement around the axis perpendicular to the surface 36, and a firm fixation is achieved. Further, in the attached state, the insertion portion 23b is substantially concentric with the insertion hole 43 and the attachment hole 17a.
- the clip 23 includes one in which one insertion portion 23 b is provided in the attachment plate 23 a and one in which two insertion portions 23 b are provided in the attachment plate 23 a.
- the former is used in the insertion hole 43 arranged at the end in the chassis 14, whereas the latter is used in a form straddling the two light guide plates 18 arranged in parallel, and the two light guide plates 18 are bundled together.
- a housing recess 44 for receiving the mounting plate 23 a of the clip 23 is provided on the periphery of the insertion hole 43, and thereby the mounting plate 23 a protrudes from the board mounting portion 30 to the front side. Therefore, it contributes to space saving, that is, to making the backlight device 12 thinner.
- a photosensor housing hole 45 capable of housing the photosensor 22 mounted on the LED substrate 17 is formed between the LED housing holes 33 in the board mounting portion 30 so as to penetrate therethrough. Since a predetermined number of the photosensors 22 are intermittently arranged on the LED substrate 17 and are arranged only between specific LEDs, the photosensors 22 are arranged in the photosensor housing holes 45 of all the light guide plates 18 in the chassis 14. 22 is not arranged.
- a pair of notches 46 are symmetrically arranged between the photosensor housing hole 45 and the LED housing holes 33 in the board mounting portion 30. This notch 46 is configured to open rearward while penetrating the board mounting portion 30, and a screw (not shown) for fixing the LED board 17 to the chassis 14 is passed therethrough. ing. Note that the notches 46 are not used in all the light guide plates 18 in the chassis 14 like the photosensor housing holes 45.
- the light guide plate 18 is planarly arranged in a grid pattern in the bottom plate 14a of the chassis 14, and the arrangement form will be described in detail.
- the arrangement form in the tandem arrangement direction (Y-axis direction) will be described.
- the light guide plate 18 is attached in a state in which the light guide portion 32 and the light output portion 31 are lifted from the LED substrate 17.
- the light guide plate 18 adjacent to the light guide plate 18 adjacent to the upper side in the vertical direction (including the clip 23) and the light guide portion 32 is disposed so as to cover the entire region from the front side.
- the substrate mounting portion 30 and the light guide portion 32 in the front light guide plate 18 and the rear light guide portion 32 and the light output portion 31 overlap each other when viewed in a plan view. It is a positional relationship. That is, the substrate mounting portion 30 and the light guide portion 32 which are non-light emitting portions of the light guide plate 18 are covered with the light guide portion 32 and the light output portion 31 of the light guide plate 18 adjacent to the rear side thereof, so that the diffusion plate 15b side.
- the light exit surface 36 of the light output portion 31 that is a light emitting portion is exposed to the diffuser plate 15b side. Thereby, the light emission surfaces 36 of the respective light guide plates 18 are continuously arranged almost seamlessly in the tandem arrangement direction.
- the reflection sheet 24 is disposed on almost the entire surface of the back side of the light guide unit 32 and the light output unit 31, even if light leaks due to being reflected by the light incident surface 34, The leakage light is prevented from entering the rear light guide plate 18.
- the clip 23 for fixing the board mounting portion 30 to the LED board 17 is also covered from the front side by the reflection sheet 24 of the light guide plate 18 disposed on the rear side thereof, so that the clip 23 is on the front side. It is designed to be prevented from being visually recognized.
- the light guide part 32 and the light output part 31 in the rear side (front side) light guide plate 18 are mechanically supported from the back side by the light guide plate 18 overlapping the front side (back side).
- the front-side inclined surface 40 and the back-side inclined surface 39 of the light guide plate 18 have substantially the same inclination angle and are parallel to each other, there is almost no gap between the light guide plates 18 that overlap the front and back surfaces. Therefore, the front light guide plate 18 can be supported by the back light guide plate 18 without rattling.
- the light guide part 32 in the rear light guide plate 18 only covers the substrate attachment part 30 in the front light guide plate 18, and the rear part faces the LED substrate 17.
- the light guide plates 18 are not overlapped with each other in a predetermined direction with respect to a direction orthogonal to the tandem arrangement direction (X-axis direction). They are arranged in parallel at intervals. By providing this gap, a certain air layer can be secured between the light guide plates 18 adjacent in the X-axis direction, and this allows light to pass and mix between the light guide plates 18 adjacent in the X-axis direction. Thus, the optical independence of each light guide plate 18 is secured.
- the interval between the light guide plates 18 is equal to or smaller than the slit 42.
- a large number of light guide plates 18 are arranged in a plane in the chassis 14, and a light output surface of the entire backlight device 12 is configured by a set of the divided light output portions 31 ⁇ / b> S.
- the divided light guide portions 32S and the divided light output portions 31S of each light guide plate 18 are ensured optically independent from each other. Therefore, by individually controlling the lighting or non-lighting of each LED 16, it is possible to independently control whether or not light is emitted from each divided light emitting unit 31S, and thus driving the backlight device 12 called area active. Control can be realized. As a result, the contrast performance that is extremely important as the display performance in the liquid crystal display device 10 can be remarkably improved.
- the LEDs 16 are arranged in a state in which a predetermined gap is provided over the entire circumference with respect to the inner peripheral surface (including the light incident surface 34) in the LED accommodation hole 33.
- This gap is not uniform over the entire circumference of the LED 16, and the gap between the light emitting surface 16a and the light incident surface 34 is extremely small compared to the gap between the other surfaces. That is, the light emitting surface 16a of the LED 16 is disposed at a position close to the light incident surface 34 of the light guide plate 18, and the gap is very small.
- the light emitted from the light emitting surface 16a of the LED 16 becomes difficult to be reflected by the light incident surface 34, and is efficiently incident on the light incident surface 34, thereby improving the incident efficiency. is there.
- an assembly error generated when the light guide plate 18 is assembled to the LED substrate 17 can be absorbed. It is possible to prevent damage and protect it.
- the relationship among the light emitting surface 16a of the LED 16, the light incident surface 34 of the light guide plate 18, and the fixing position (the insertion hole 43 and the insertion portion 23b) of the light guide plate 18 by the clip 23 will be described in detail.
- the light emitting surface 16a of the LED 16 and the light incident surface 34 of the light guide plate 18 are parallel to each other, parallel to the X-axis direction, that is, the light emitting surface 36, and between the LED 16 and the light incident surface 34.
- the shape is substantially straight along a direction orthogonal to the arrangement direction (Y-axis direction).
- the insertion hole 43 to which the clip 23 in the light guide plate 18 is attached has substantially the same positional relationship in the front-rear direction with respect to the light incident surface 34, that is, the alignment direction (Y-axis direction) of the LED 16 and the light incident surface 34. It is arranged like this.
- the center C of the insertion hole 43 and the light incident surface 34 are arranged at substantially the same position in the front-rear direction, and the straight line L connecting the center C of the insertion hole 43 and the light incident surface 34 is in the X-axis direction. It is almost parallel to. Since the insertion portion 23b of the clip 23 is substantially concentric with the insertion hole 43, the positional relationship between the center C of the insertion portion 23b and the light incident surface 34 is the same as described above. That is, it can be said that the insertion portion 23b of the clip 23 is disposed at a position substantially coincident with the light incident surface 34 in the front-rear direction.
- the pair of insertion holes 43 (insertion portions 23b) arranged at both side end positions of the light guide plate 18 are disposed at substantially the same position in the front-rear direction, so that both insertion holes 43 (both insertions) The centers C of the portions 23b) are both arranged on the line L.
- the parallel surface 38 formed in the surface of the back side of the light-guide plate 18 is each formed in the perimeter of both the insertion holes 43 over the perimeter (FIG. 13).
- the light guide plate 18 having the above-described configuration is assembled to the LED substrate 17 in a state where each LED 16 is surface-mounted in the manufacturing process of the backlight device 12. Specifically, after each LED substrate 17 is attached to a predetermined position with respect to the bottom plate 14a of the chassis 14 (FIG. 3), the light guide plate 18 is attached to a position corresponding to each LED 16 on each LED substrate 17. At this time, the light guide plate 18 is first attached to a position corresponding to the LED 16 at the upper end position (front end position) in the vertical direction (tandem arrangement direction, Y-axis direction) on the bottom plate 14a of the chassis 14, and then the lower side in the vertical direction. They are sequentially attached to the (rear) LED 16 (FIGS. 7 to 9).
- the light guide plate 18 attached after the second is partially overlapped with the light guide plate 18 adjacent on the upper side (front side) in the vertical direction from the front side. Accordingly, the light guide plates 18 are arranged in tandem along the vertical direction in a state where the light guide plates 18 are stacked on each other.
- each light guide plate 18 In attaching the light guide plate 18, the LED accommodation hole 33 is aligned with the LED 16, and the insertion hole 43 is aligned with the attachment hole 17 a of the LED substrate 17. In this state, the insertion portion 23b of the clip 23 is inserted into the insertion hole 43 and the attachment hole 17a from the front side. In the insertion process, both locking pieces 23c are temporarily elastically deformed so as to be narrowed by the edges of the insertion hole 43 and the mounting hole 17a (to approach the insertion part 23b side). Then, when the insertion portion 23b is inserted to a proper depth, both the locking pieces 23c are restored, and as shown in FIG.
- the tip portion is the back side (attachment to the edge of the attachment hole 17a in the LED substrate 17 (attachment). It is locked from the opposite side of the plate 23a.
- the light guide plate 18 is fixed to the LED substrate 17 in a state where the substrate attachment portion 30 and the LED substrate 17 are sandwiched between the attachment plate 23a and the locking piece 23c.
- the entire area of the mounting plate 23 a is housed in the housing recess 44 of the light guide plate 18 and does not protrude to the front side of the board mounting portion 30.
- the light guide plate 18 has a pair of insertion holes 43 to which the clips 23 are attached and has two fixing positions. For example, the light guide plate 18 rotates around the Z axis.
- the insertion holes 43 are disposed at both side positions sandwiching the LED 16 and they are disposed at substantially the same position in the front-rear direction, the light guide plate 18 can be stably fixed and the light to the LED 16 can be fixed. The positional relationship before and after the incident surface 34 can be further stabilized.
- the assembly of the backlight device 12 and the liquid crystal display device 10 is completed by incorporating other members.
- the power source of the liquid crystal display device 10 is turned on and each LED 16 is turned on, each LED 16 generates heat, and the temperature in the backlight device 12 rises.
- thermal expansion occurs in each light guide plate 18. The thermal expansion is caused by the fixing position of the light guide plate 18 with respect to the LED substrate 17 by the clip 23, that is, the insertion portion 23 b (insertion hole 43) in the clip 23. Is generated from the base point.
- a portion of the light guide plate 18 having a large distance from the insertion portion 23b (fixed position) of the clip 23 serving as a base point of thermal expansion (for example, the front end portion of the light exit portion 31) has a large extension amount.
- the extension amount tends to be small. That is, the extension amount accompanying the thermal expansion in the light guide plate 18 is proportional to the distance from the insertion portion 23b that is the base point of the thermal expansion.
- the center C of the insertion portion 23b is substantially the same position as the light incident surface 34 with respect to the front-rear direction, and the insertion portion 23b, which is the base point of thermal expansion, is light incident. Since the distance from the surface 34 is almost zero, even if thermal expansion occurs in the light guide plate 18, the relative positional relationship of the light incident surface 34 with respect to the light emitting surface 16a of the LED 16 is completely changed. It ’s not good enough. If the light incident surface 34 is relatively displaced forward with respect to the light emitting surface 16a of the LED 16 due to thermal expansion of the light guide plate 18, a gap (interval, clearance) between the LED 16 and the light incident surface 34 increases.
- the light emitted from the LED 16 is more likely to be reflected by the light incident surface 34, and as a result, the light incident efficiency at the light incident surface 34 and the light emission efficiency at the light emitting surface 36 are reduced, and the light guide plate 18. There is a risk of lowering the overall brightness.
- the light incident surface 34 does not relatively move forward with respect to the light emitting surface 16 a of the LED 16.
- the light incident efficiency on the light incident surface 34 and the light output efficiency on the light exit surface 36 are substantially constant, thereby stabilizing the luminance of the light guide plate 18 at a high level. Can do it.
- each light guide plate 18 has a set of light emitting surfaces 36. Since the light emitting surface of the entire backlight device 12 is configured, the luminance distribution in the surface of the light emitting surface of the entire backlight device 12 can be made uniform by stabilizing the individual luminance of each light guide plate 18. Thus, uneven brightness in the same plane can be prevented.
- each LED 16 is periodically blinked, and the time ratio between the lighting period and the extinguishing period is changed. In any case, as the lighting state of each LED 16 is changed, the temperature in the backlight device 12 rises or falls, and when the temperature falls, the light guide plate 18 undergoes thermal contraction. become.
- the insertion portion 23b of the clip 23 that fixes the light guide plate 18 to the LED substrate 16 is disposed at substantially the same position as the light incident surface 34 in the front-rear direction. Even if it occurs, the light incident surface 34 does not move rearward relative to the light emitting surface 16a of the LED 16, and therefore the light incident efficiency on the light guide plate 18 and the gap between the light emitting surface 16a and the light incident surface 34. As a result, the light emission efficiency becomes substantially constant, and the luminance of the light guide plate 18 can be stabilized in a high state.
- the LED 16 the light incident surface 34 that is arranged to face the LED 16 and receives light from the LED 16, and the LED 16 and the light incident surface 34.
- the light guide plate 18 having a light emitting surface 36 that emits light in parallel with the alignment direction, the LED substrate 17 to which the LEDs 16 and the light guide plate 18 are fixed, and the light guide plate 18 to the LED substrate 17 are fixed.
- a clip 23 disposed near the light incident surface 34 with respect to the alignment direction of the LED 16 and the light incident surface 34.
- the light guide plate 18 When the temperature environment in the backlight device 12 is changed by turning on or off the LED 16, the light guide plate 18 is thermally expanded or contracted accordingly. At this time, the light guide plate 18 is thermally expanded or contracted with the fixing position of the LED substrate 17 by the clip 23 as a base point. Therefore, by arranging the clip 23 in the vicinity of the light incident surface 34 with respect to the alignment direction of the LED 16 and the light incident surface 34, the light with respect to the LED 16 with respect to the alignment direction can be obtained even if thermal expansion or contraction occurs in the light guide plate 18. A change in the relative positional relationship of the incident surface 34 can be suppressed. Therefore, the incident efficiency of the light from the LED 16 with respect to the light guide plate 18 can be stabilized, and the luminance of the light guide plate 18 can be stabilized.
- the fixing portion (insertion portion 23b and insertion hole 43) by the clip 23 is arranged at a position that coincides with the light incident surface 34 with respect to the arrangement direction of the LED 16 and the light incident surface 34. In this way, there is almost no change in the relative positional relationship of the light incident surface 34 with respect to the LED 16 with respect to the alignment direction of the LED 16 and the light incident surface 34, and the light incident efficiency with respect to the light incident surface 34 is extremely stable. Can do it.
- the arrangement of the fixing points by the clip 23 is included in the range from the light incident surface 34 to the light emitting surface 16a of the LED 16 facing the light incident surface 34 with respect to the arrangement direction of the LED 16 and the light incident surface 34.
- a pair of fixing portions by the clip 23 are arranged in a side position sandwiching the LED 16 in a direction parallel to the light emitting surface 36 and intersecting the alignment direction of the LED 16 and the light incident surface 34.
- the light guide plate 18 can be stably fixed by arranging the fixing portion by the pair of clips 23 at the side position sandwiching the LED 16, and the LED 16 and the light incident surface 34 are arranged side by side. The positional relationship of the light incident surface 34 with respect to the LED 16 with respect to the direction can be further stabilized.
- the pair of fixing points in the clip 23 are arranged at substantially the same position with respect to the arrangement direction of the LED 16 and the light incident surface 34. In this way, the light guide plate 18 can be more stably fixed, and the positional relationship of the light incident surface 34 with respect to the LED 16 can be further stabilized.
- a plurality of LEDs 16 and light guide plates 18 are arranged in parallel. In this way, since the brightness of each light guide plate 18 is stabilized, it is possible to prevent uneven brightness from occurring in the entire backlight device 12.
- the LED 16 and the light guide plate 18 are arranged two-dimensionally in parallel. In this way, since the light emitting surfaces 36 of the respective light guide plates 18 are two-dimensionally arranged in parallel, it is possible to make the luminance unevenness less likely to occur in the entire backlight device 12.
- a reflection sheet 24 that reflects light toward the light emission surface 36 is provided on the surface of the light guide plate 18 opposite to the light emission surface 36, and the clip 23 reflects the adjacent light guide plate 18. Covered by a sheet 24. By doing so, it is possible to prevent the clip 23 from being visually recognized from the light emitting surface 36 side, and therefore it is possible to further prevent uneven brightness from occurring in the entire backlight device 12.
- the clip 23 is formed on the light guide plate 18 and is disposed in a lateral position in a direction parallel to the light emitting surface 36 with respect to the light incident surface 34 and intersecting the alignment direction of the LEDs 16 and the light incident surface 34. It is attached in a state of penetrating through the insertion hole 43. If the insertion hole 43 is formed in the light guide plate 18 and the clip 23 is passed therethrough, the clip 23 may optically interfere with the light in the light guide plate 18. By disposing at a side position with respect to the surface 34, the above problem can be solved and the luminance in the light guide plate 18 can be stabilized.
- the clip 23 is formed in the insertion plate 43 and the LED substrate 17 that protrudes from the attachment plate 23 a to the LED substrate 17 side with respect to the light guide plate 18 on the side opposite to the LED substrate 17 side.
- the insertion portion 23b is inserted into the attachment hole 17a, and a locking piece 23c is provided in the insertion portion 23b and is locked to the LED board 17 from the side opposite to the mounting plate 23a side. If it does in this way, while the insertion part 23b which comprises the clip 23 penetrates the light-guide plate 18 and the LED board 17, the light-guide plate 18 and the LED board 17 were inserted
- the light guide plate 18 is provided with a housing recess 44 for housing the mounting plate 23a. In this way, since the mounting plate 23a is accommodated in the accommodating recess 44, the entire backlight device 12 can be reduced in thickness.
- the LED substrate 17 on which the LEDs 16 are mounted is used as a base material on which the LEDs 16 and the light guide plate 18 are fixed.
- the positional relationship between the LED 16 and the light incident surface 34 can be stabilized by fixing the light guide plate 18 with the clip 23 to the LED substrate 17 on which the LED 16 is mounted.
- the light guide plate 18 includes a substrate attachment portion 30 attached to the LED substrate 17, a light guide portion 32 that guides light incident from the light incident surface 34, and a light exit surface 36, and the light guide portion 32.
- the light output unit 31 that emits light from the outside is connected along the alignment direction of the LED 16 and the light incident surface 34. In this way, the light guide plate 18 tends to be elongated in the direction in which the LED 16 and the light incident surface 34 are aligned, and the amount of expansion or contraction during thermal expansion or contraction tends to increase, which is particularly suitable. .
- the LED 16 mounted on the surface of the LED substrate 17 is used as a light source. In this way, it is possible to increase the brightness.
- the insertion hole 43 of the light guide plate 18-A and the insertion portion 23b-A of the clip 23-A have the LED 16 in the front-rear direction (the alignment direction of the LED 16-A and the light incident surface 34-A).
- the straight line LA connecting the center CA of the insertion hole 43-A and the light emitting surface 16a-A is substantially the same as the X-axis direction. They are parallel.
- the insertion hole 43-A and the insertion portion 23b-A are arranged on the rear side (only a small gap between the light emitting surface 16a-A and the light incident surface 34-A with respect to the light incident surface 34-A). LED16-A side).
- the light incident surface 34-A can be relatively displaced relative to the light emitting surface 16a-A of the LED 16-A. Therefore, it is possible to avoid a change that adversely affects the light incidence efficiency and the light emission efficiency in the light guide plate 18-A.
- the fixing position by the clip 23-A is the light-incident surface 34-A to the LED 16-A in the alignment direction of the LED 16-A and the light incident surface 34-A. It is arranged in a range up to the light emitting surface 16a-A facing the light incident surface 34-A.
- the clip 23-A By arranging the clip 23-A in the above range, the relative positional relationship of the light incident surface 34-A with respect to the LED 16-A is changed with respect to the alignment direction of the LED 16-A and the light incident surface 34-A. It can prevent suitably.
- the fixing portion by the clip 23-A is arranged on the LED 16-A side with respect to the light incident surface 34-A. In this way, it is possible to prevent the clip 23-A from optically hindering the light incident on the light incident surface 34-A. Thereby, the brightness
- Embodiment 3 of the present invention will be described with reference to FIG.
- the position of the clip 23-B with respect to the light incident surface 34-B is further changed.
- parts having the same names as those in the first embodiment are denoted by the same reference numerals and suffixed with a suffix -B, and redundant description of the structure, operation, and effects is omitted. To do.
- the insertion hole 43-B of the light guide plate 18-B and the insertion portion 23b-B of the clip 23-B are in the front-rear direction (the alignment direction of the LED 16-B and the light incident surface 34-B).
- the straight line LB connecting the center CB of the insertion hole 43-B and the center position of the LED 16-B is substantially the same as the X-axis direction. They are parallel. Even in such an arrangement, when thermal expansion occurs in the light guide plate 18-B, the light incident surface 34-B is slightly displaced relative to the light emitting surface 16a-B of the LED 16-B. Therefore, it is possible to avoid a change that adversely affects the light incident efficiency and the light emitting efficiency in the light guide plate 18-B.
- the fixing location by the clip 23-B is the same as the alignment direction of the LED 16-B and the light incident surface 34-B from the light incident surface 34-B to the LED 16-B. It is arranged in a range up to the end opposite to the light incident surface 34-B side.
- the clip 23-B By arranging the clip 23-B in the range as described above, the relative positional relationship of the light incident surface 34-B with respect to the LED 16-B with respect to the alignment direction of the LED 16-B and the light incident surface 34-B is changed. It can prevent suitably.
- the fixing portion by the clip 23-B is arranged on the LED 16-B side with respect to the light incident surface 34-B. In this way, it is possible to prevent the clip 23-B from optically hindering the light incident on the light incident surface 34-B. Thereby, the brightness
- a fourth embodiment of the present invention will be described with reference to FIG.
- the position of the clip 23-C with respect to the light incident surface 34-C is further changed.
- parts having the same names as those in the first embodiment are denoted by the same reference numerals and suffixed with a suffix -C, and redundant description of the structure, operation, and effects is omitted. To do.
- the insertion hole 43-C of the light guide plate 18-C and the insertion portion 23b-C of the clip 23-C are related to the front-rear direction (the alignment direction of the LED 16-C and the light incident surface 34-C).
- the straight line LC connecting the center CC of the insertion hole 43-C and the rear end surface 16f of the LED 16-C is arranged in the X-axis direction. It is almost parallel to. Even in such an arrangement, when thermal expansion occurs in the light guide plate 18-C, the light incident surface 34-C is slightly displaced relative to the light emitting surface 16a-C of the LED 16-C. Therefore, it is possible to avoid a change that adversely affects the light incident efficiency and the light emitting efficiency in the light guide plate 18-C.
- the fixing location by the clip 23-C is the same as the alignment direction of the LED 16-C and the light incident surface 34-C, from the light incident surface 34-C to the LED 16-C. It is arranged in a range up to the rear end face 16f which is the end opposite to the light incident face 34-C.
- the clip 23-C By arranging the clip 23-C in the above-described range, the relative positional relationship of the light incident surface 34-C with respect to the LED 16-C is changed with respect to the alignment direction of the LED 16-C and the light incident surface 34-C. It can prevent suitably.
- the fixing portion by the clip 23-C is arranged on the LED 16-C side with respect to the light incident surface 34-C. In this way, it is possible to prevent the clip 23-C from optically hindering the light incident on the light incident surface 34-C. Thereby, the luminance in the light guide plate 18-C can be stabilized.
- a fifth embodiment of the present invention will be described with reference to FIG.
- the LED 16-D and the light incident surface 34-D are changed in distance.
- parts having the same names as those in the first and fourth embodiments are denoted by the same reference numerals and suffixed with a suffix -D. Is omitted.
- the LED 16-D is arranged at a substantially central position in the LED housing hole 33-D of the light guide plate 18-D, and the light incident surface 34-, which is the front end surface of the LED housing hole 33-D.
- the distance between D and the light emitting surface 16a-D of the LED 16-D is substantially the same as the distance between the rear end surface 33a of the LED receiving hole 33-D and the rear end surface 16f-D of the LED 16-D. Yes. Therefore, the clearance secured between the light emitting surface 16a-D and the light incident surface 34-D of the LED 16-D is relatively larger than that described in the first to fourth embodiments.
- FIG. 6 A sixth embodiment of the present invention will be described with reference to FIG.
- the light incident surface 34-E of the light guide plate 18-E is changed in shape.
- parts having the same names as those in the first embodiment are denoted by the same reference numerals and suffixed with the suffix -E, and redundant description of the structure, operation, and effects is omitted. To do.
- the light incident surface 34 -E has a concave curved shape when viewed in plan. Specifically, the light incident surface 34-E is substantially perpendicular to the cross-sectional shape along the X-axis direction and the Y-axis direction, that is, the arrangement direction of the light emitting surface 16a-E and the light incident surface 34-E, and emits light.
- a cross-sectional shape along a plane parallel to the plane has a substantially arc shape. Since the light emitting surface 16a-E of the LED 16-E is substantially straight along the X-axis direction with respect to the light incident surface 34-E, a gap between the light incident surface 34-E and the light emitting surface 16a-E is present. Tends to be maximum at the center position in the X-axis direction, and gradually decrease toward both ends.
- the insertion hole 43-E of the light guide plate 18-E and the insertion portion 23b-E of the clip 23-E are disposed at substantially the same position as the front end portion of the light incident surface 34-E having the above-described shape in the front-rear direction. . Specifically, the insertion hole 43-E and the center CE of the insertion portion 23b-E are arranged on a tangent line TL passing through the front end portion of the light incident surface 34-E, that is, the center position in the X-axis direction.
- a seventh embodiment of the present invention will be described with reference to FIG.
- the shape of the light emitting surface 16a-F of the LED 16-F is changed from that of the sixth embodiment.
- parts having the same names as those in the first and sixth embodiments are denoted by the same reference numerals and suffixed with a suffix -F. Is omitted.
- the light emitting surface 16a-F of the LED 16-F has a concave curved shape when viewed from above, and is parallel to the light incident surface 34-F of the light guide plate 18-F.
- the light emitting surface 16a-F of the LED 16-F is substantially orthogonal to the cross-sectional shape along the X-axis direction and the Y-axis direction, that is, the arrangement direction of the light emitting surface 16a-F and the light incident surface 34-F.
- the cross-sectional shape along a plane parallel to the light emitting surface is formed in a substantially arc shape concentric with the light incident surface 34-F.
- the gap between the light incident surface 34-F and the light emitting surface 16a-F is substantially constant over the entire area.
- the insertion hole 43-F of the light guide plate 18-F and the insertion part 23b-F of the clip 23-F have the center C-F at the front end of the light incident surface 34-F, that is, the center position in the X-axis direction. It is arranged on the tangent line TL-F that passes through, and is arranged so as to coincide with the light incident surface 34-F in the front-rear direction.
- FIG. 8 An eighth embodiment of the present invention will be described with reference to FIG.
- a structure in which the housing structure of the LED 16-G in the light guide plate 18-G is changed is shown.
- parts having the same names as those in the first embodiment are denoted by the same reference numerals and suffixed with -G, and redundant description of the structure, operation, and effects is omitted. To do.
- the LED housing hole 33-G for housing the LED 16-G is configured to penetrate the light guide plate 18-G in the thickness direction and open backward as shown in FIG. That is, it can be said that the edge of the LED housing hole 33-G has a gate shape when viewed in a plane, and has an end-ring shape.
- the light incident surface 34-G is exposed to the outside outside because the LED receiving hole 33-G is open rearward as described above.
- one notch 46-G is disposed at a position behind the photosensor housing hole 45-G in the board mounting portion 30-G.
- Embodiment 9 of the present invention will be described with reference to FIG.
- the fixing member for fixing the light guide plate 18-H is changed.
- parts having the same names as those in the first embodiment are denoted by the same reference numerals and suffixed with the suffix -H, and redundant description of the structure, operation, and effects is omitted. To do.
- a locking piece 25 provided integrally with the LED substrate 17-H is used as a fixing member for fixing the light guide plate 18-H.
- the locking piece 25 is disposed at a lateral position on the LED board 17-H that is a predetermined distance away from the LED 16-H in the X-axis direction (a distance that allows reception of the board mounting portion 30-H of the light guide plate 18-H).
- the rising portion 25a rises from the front surface of the LED substrate 17-H, and the arm portion 25b is bent from the rising portion 25a toward the LED 16-H.
- the arm portion 25b has a cantilever shape and can be elastically deformed along the Z-axis direction with a base end portion (a bent portion from the rising portion 25a) as a fulcrum. At the position between the base end portion and the free end portion of the arm portion 25b, a locking convex portion 25c protruding toward the LED substrate 17-H is formed by bending.
- a pair of the locking piece 25 is arrange
- the board mounting portion 30-H of the light guide plate 18-H is provided with a housing recess 47 for receiving the locking piece 25, and the locking piece 25 protrudes to the front side of the board mounting portion 30-H in the housed state. It is avoided.
- the relationship between the accommodation recess 47 and the locking piece 25 is the same as the relationship between the accommodation recess 44 and the mounting plate 23a described in the first embodiment (FIG. 6), and redundant description is omitted.
- a locking recess 47a for receiving the locking projection 25c of the arm 25b is provided on the surface (surface on the front side) of the receiving recess 47 facing the arm 25b of the locking piece 25.
- the arm portion 25b of the locking piece 25 is received in the receiving recess 47 and the locking projection 25c enters the locked recess 47a. And the peripheral surfaces are latched. Thereby, the light guide plate 18-H can be fixed to a desired position with respect to the LED substrate 17-H.
- the locking piece 25 is arranged at a position shifted laterally in the X-axis direction with respect to the light guide plate 18-H.
- the arrangement of the locking piece 25 in the front-rear direction with respect to the light incident surface 34-H of the light guide plate 18-H and the light emitting surface of the LED 16-H is selected from any of those described in the first to eighth embodiments. be able to.
- the fixing member for fixing the light guide plate 18-H is provided integrally with the LED substrate 17-H, and is a recessed recess formed in the light guide plate 18-H.
- the locking piece 25 is lockable with respect to 47a. In this way, since the light guide plate 18-H can be fixed by the locking piece 25 provided integrally with the LED substrate 17-H, stable fixing can be achieved. Further, by providing the locking piece 25 as a fixing member integrally with the LED board 17-H, it is possible to reduce the number of parts, the number of assembling steps, and the manufacturing cost as compared with a case where the fixing piece 25 is provided separately. be able to.
- the fixing position of the light guide plate in the front-rear direction by a fixing member such as a clip can be changed as appropriate in addition to the first to fourth embodiments described above.
- the position may be a rear position from the rear end face of the LED.
- the light incident surface of the light guide plate due to thermal expansion or contraction of the light guide plate is closer to the front and rear direction of the light guide plate by a fixing member such as a clip as the position is closer to the light incident surface.
- a fixing member such as a clip
- the fixing position in the front-rear direction of the light guide plate by a fixing member such as a clip is a position in the vicinity of the light incident surface, and the change in the positional relationship of the light incident surface with respect to the LED due to thermal expansion or contraction of the light guide plate is Any suitable range can be used as long as it does not adversely affect the light guide plate.
- the light guide plate is fixed to a pair of fixing members such as clips.
- the number of the fixing points may be one, or may be three or more. I do not care.
- the fixing point be arranged at the center position in the short side direction of the light guide plate.
- the number of fixing points is three or more, it is preferable that at least two points are arranged at positions sandwiching the LEDs.
- at least one need only be in the vicinity of the light incident surface, and the others are not necessarily arranged in the vicinity of the light incident surface, and can be freely set. be able to.
- the light guide plate is fixed to the LED substrate.
- the light guide plate is fixed to the bottom plate of the chassis to which the LED substrate is integrally fixed. It is included in the present invention.
- the bottom plate of the chassis becomes the “base material” and the light guide plate is directly fixed to the bottom plate of the chassis that is the base material, whereas the LED is indirectly connected to the base material of the chassis that is the base material through the LED board. It becomes the structure fixed to a baseplate.
- the locking piece is disposed at a position shifted laterally with respect to the light guide plate.
- the locking piece is at a position shifted backward with respect to the light guide plate.
- Those arranged are also included in the present invention. In that case, it is also possible to arrange the locking pieces so as to face the light incident surface in the front-rear direction and not to be shifted laterally.
- one slit is provided in the light guide plate and two divided light output portions and two divided light guide portions (light incident surfaces) are provided.
- the slit is provided in the light guide plate.
- Two or more light emitting units and three or more divided light guiding units (light incident surfaces) are provided in the present invention. In this way, since three or more LEDs can be collectively covered by a single light guide plate, the assembling workability of the backlight device is excellent. Even in such a case, it is preferable that a pair of fixing positions of the light guide plate by a fixing member such as a clip is arranged at a position where the LEDs are sandwiched together.
- a slit is provided in the light guide plate to divide the light output portion and the light guide portion, and a plurality of LEDs are collectively covered by one light guide plate.
- a light guide plate that does not have a slit and covers each LED individually (having only one light incident surface) is also included in the present invention. If it does in this way, it can prevent reliably that the light from adjacent LED which does not respond
- the light guide plate has a rectangular shape when viewed in a plane, but the light guide plate may have a square shape when viewed in a plane.
- each length dimension, each width dimension, each thickness dimension, and each outer surface shape in the substrate mounting portion, the light guide portion, and the light output portion can be appropriately changed.
- the light emission direction of the LED has been shown to be upward in the vertical direction.
- the light emission direction of the LED that is, the installation direction of the LED on the LED substrate can be appropriately changed.
- the present invention includes those in which the LED is installed with respect to the LED substrate so that the light emission direction is downward in the vertical direction and those in which the light emission direction (optical axis) is aligned with the horizontal direction.
- what mixed LED from which a light emission direction is mixed is also contained in this invention.
- the light guide plates are arranged so as to overlap each other when viewed in a plane.
- the present invention includes an arrangement where light guide plates are not overlapped when viewed in a plane.
- the LED and the light guide plate are two-dimensionally arranged in parallel in the chassis.
- the one-dimensionally parallel arrangement is also included in the present invention. include. Specifically, the LED and the light guide plate are arranged in parallel only in the vertical direction, and the LED and the light guide plate are arranged in parallel only in the horizontal direction are also included in the present invention.
- the LED using three types of LED chips each emitting R, G, and B in a single color is shown.
- one type of LED chip that emits blue or purple in a single color is also included.
- the light source using a point light source is exemplified, but a light source using a linear light source such as a cold cathode tube or a hot cathode tube is also included in the present invention. Moreover, what combined point light sources, such as LED, a cold cathode tube, and a hot cathode tube may be used.
- the configuration of the optical member can be appropriately changed. Specifically, the number of diffusion plates and the number and type of optical sheets can be changed as appropriate. It is also possible to use a plurality of optical sheets of the same type.
- liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.
- a TFT is used as a switching element of a 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)).
- a switching element other than TFT for example, a thin film diode (TFD)
- the present invention can also be applied to a liquid crystal display device for monochrome display.
- the liquid crystal display device using the liquid crystal panel as the display element has been exemplified.
- the present invention can be applied to display devices using other types of display elements.
- 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.
- one LED is accommodated in the LED accommodating recess.
- a plurality of LEDs 16x, 16y, and 16z may be accommodated as shown in FIG.
- a single package of LED chips may be adopted.
- a clip for fixing the light guide plate to the LED substrate from the upper surface side of the light guide plate is used as the fixing member.
- the fixing member 23f in this case is composed of an elastic piece 23d having a protrusion 23e, and the protrusion 23e is fitted into the recess 44a of the light guide plate 18 by utilizing the elasticity of the elastic piece 23d.
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Abstract
Description
ところで、上記した構成のバックライト装置において、LEDを点灯・消灯させると、バックライト装置内の温度環境が変化し、それに伴って導光板に熱膨張・熱収縮が生じ得る。このとき、導光体が熱膨張・熱収縮すると、光源と光入射面との間の間隔に変化が生じる場合があり、そうなるとLEDから発せられた光の導光板に対する入射効率が変化し、導光板の輝度にばらつきが生じる、という結果をもたらすおそれがあった。特に、LEDの発光面と導光体の光入射面との間の間隔が広がると、光入射面において反射される光が増加してしまい、導光体に対する光の入射効率並びに輝度の低下を招くという問題があった。
本発明の照明装置は、光源と、前記光源と対向状に配されるとともに前記光源からの光が入射される光入射面、及び前記光源と前記光入射面との並び方向に対して並行するとともに光を出射させる光出射面を有する導光体と、前記光源及び前記導光体が固定される基材と、前記導光体を前記基材に対して固定するためのものであって、前記光源と前記光入射面との並び方向に関して前記光入射面の近傍位置に配される固定部材とを備える。
(1)前記固定部材は、前記並び方向に関して、前記光入射面から、前記光源のうち前記光入射面側とは反対側の端部までの範囲に配されている。固定部材を上記のような範囲に配することで、光源と光入射面との並び方向に関して光源に対する光入射面の相対的な位置関係に変化が生じるのを好適に防ぐことができる。
本発明によれば、照明装置において輝度を安定化させることができる。
本発明の実施形態1を図1~図14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4~図10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15によって説明する。この実施形態2では、光入射面34‐Aに対するクリップ23‐Aの位置を変更したものを示す。なお、この実施形態2では、上記した実施形態1と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Aを付すものとし、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によって説明する。この実施形態3では、光入射面34‐Bに対するクリップ23‐Bの位置をさらに変更したものを示す。なお、この実施形態3では、上記した実施形態1と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Bを付すものとし、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4を図17によって説明する。この実施形態4では、光入射面34‐Cに対するクリップ23‐Cの位置をさらに変更したものを示す。なお、この実施形態4では、上記した実施形態1と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Cを付すものとし、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5を図18によって説明する。この実施形態5では、LED16‐Dと光入射面34‐Dとの間の間隔を変更したものを示す。なお、この実施形態5では、上記した実施形態1,4と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Dを付すものとし、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6を図19によって説明する。この実施形態6では、導光板18‐Eの光入射面34‐Eの形状を変更したものを示す。なお、この実施形態6では、上記した実施形態1と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Eを付すものとし、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7を図20によって説明する。この実施形態7では、上記した実施形態6からLED16‐Fの発光面16a‐Fの形状を変更したものを示す。なお、この実施形態7では、上記した実施形態1,6と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Fを付すものとし、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8を図21によって説明する。この実施形態8では、導光板18‐GにおけるLED16‐Gの収容構造を変更したものを示す。なお、この実施形態8では、上記した実施形態1と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Gを付すものとし、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9を図22によって説明する。この実施形態9では、導光板18‐Hを固定する固定部材を変更したものを示す。なお、この実施形態9では、上記した実施形態1と同じ名称の部位には、同一の符号を用いるとともにその末尾に添え字‐Hを付すものとし、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。
Claims (20)
- 光源と、
前記光源と対向状に配されるとともに前記光源からの光が入射される光入射面、及び前記光源と前記光入射面との並び方向に対して並行するとともに光を出射させる光出射面を有する導光体と、
前記光源及び前記導光体が固定される基材と、
前記導光体を前記基材に対して固定するためのものであって、前記光源と前記光入射面との並び方向に関して前記光入射面の近傍位置に配される固定部材とを備える照明装置。 - 前記固定部材は、前記並び方向に関して、前記光入射面から、前記光源のうち前記光入射面側とは反対側の端部までの範囲に配されている請求の範囲第1項記載の照明装置。
- 前記固定部材は、前記並び方向に関して、前記光入射面から、前記光源のうち前記光入射面に対向する発光面までの範囲に配されている請求の範囲第2項記載の照明装置。
- 前記固定部材は、前記並び方向に関して、前記光入射面と一致する位置に配されている請求の範囲第3項記載の照明装置。
- 前記固定部材は、前記光入射面に対して前記光源側に配されている請求の範囲第1項から請求の範囲第3項のいずれか1項に記載の照明装置。
- 前記固定部材は、前記光出射面に並行し且つ前記並び方向と交差する方向について前記光源を挟んだ側方位置に一対配されている請求の範囲第1項から請求の範囲第5項のいずれか1項に記載の照明装置。
- 前記一対の固定部材は、前記並び方向に関してほぼ同じ位置に配されている請求の範囲第6項記載の照明装置。
- 前記光源及び前記導光体は、複数ずつ並列して配されている請求の範囲第1項から請求の範囲第7項のいずれか1項に記載の照明装置。
- 前記光源及び前記導光体は、二次元的に並列して配されている請求の範囲第8項記載の照明装置。
- 前記導光体のうち前記光出射面とは反対側の面には、光を前記光出射面側へ反射させる反射部材が設けられており、
前記固定部材は、隣接する前記導光体の前記反射部材によって覆われている請求の範囲第8項または請求の範囲第9項のいずれか1項に記載の照明装置。 - 前記固定部材は、前記導光体に形成され且つ前記光入射面に対して前記光出射面に並行し且つ前記並び方向と交差する方向について側方位置に配された挿通孔に貫通した状態で取り付けられている請求の範囲第1項から請求の範囲第10項のいずれか1項に記載の照明装置。
- 前記固定部材は、前記導光体に対して前記基材側とは反対側に配される取付部と、前記取付部から前記基材側に突出し前記挿通孔及び前記基材に形成された取付孔内に挿入される挿入部と、前記挿入部に設けられ前記基材に対して前記取付部側とは反対側から係止される係止部とから構成される請求の範囲第11項記載の照明装置。
- 前記導光体には、前記取付部を収容する収容凹部が設けられている請求の範囲第12項記載の照明装置。
- 前記固定部材は、前記基材に一体に設けられ、前記導光体に形成された被係止部に対して係止可能な係止片である請求の範囲第1項から請求の範囲第10項のいずれか1項に記載の照明装置。
- 前記基材は、前記光源が実装される回路基板である請求の範囲第1項から請求の範囲第14項のいずれか1項に記載の照明装置。
- 前記導光体は、前記回路基板に対して取り付けられる基板取付部と、前記光入射面から入射した光を導光する導光部と、前記光出射面を有するとともに前記導光部からの光を外部に出射させる出光部とを、前記並び方向に沿って連ねた構成とされている請求の範囲第15項記載の照明装置。
- 前記光源は、前記回路基板上に表面実装された発光ダイオードである請求の範囲第15項または請求の範囲第16項記載の照明装置。
- 請求の範囲第1項から請求の範囲第17項のいずれか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の範囲第18項記載の表示装置。
- 請求の範囲第18項または請求の範囲第19項に記載された表示装置を備えるテレビ受信装置。
Priority Applications (2)
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US13/127,070 US20110211134A1 (en) | 2008-11-27 | 2009-09-07 | Lighting device, display device and television receiver |
CN200980147540XA CN102227585A (zh) | 2008-11-27 | 2009-09-07 | 照明装置、显示装置和电视接收装置 |
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US (1) | US20110211134A1 (ja) |
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WO2013069592A1 (ja) * | 2011-11-09 | 2013-05-16 | シャープ株式会社 | 照明装置、表示装置及びテレビ受信装置 |
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WO2012002010A1 (ja) * | 2010-06-28 | 2012-01-05 | パナソニック液晶ディスプレイ株式会社 | 液晶表示装置およびテレビ受像機 |
JP2014085653A (ja) * | 2012-10-26 | 2014-05-12 | Funai Electric Co Ltd | 表示装置 |
KR102114154B1 (ko) * | 2013-07-02 | 2020-05-25 | 삼성디스플레이 주식회사 | 표시 장치 |
TWI743533B (zh) * | 2019-08-14 | 2021-10-21 | 佳世達科技股份有限公司 | 顯示裝置及其框架模組 |
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JP2002279821A (ja) * | 2001-03-19 | 2002-09-27 | Mitsubishi Electric Corp | 照明装置 |
WO2008050509A1 (fr) * | 2006-10-27 | 2008-05-02 | Sharp Kabushiki Kaisha | Dispositif source de lumière, dispositif de rétroéclairage et afficheur à cristaux liquides |
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KR100654220B1 (ko) * | 1999-08-03 | 2006-12-05 | 삼성전자주식회사 | 액정표시장치 |
JP3760900B2 (ja) * | 2001-09-06 | 2006-03-29 | セイコーエプソン株式会社 | 導光装置、電気光学装置及び電子機器 |
JP4029743B2 (ja) * | 2003-02-24 | 2008-01-09 | ソニー株式会社 | バックライト |
JP2005309103A (ja) * | 2004-04-22 | 2005-11-04 | Hitachi Displays Ltd | 液晶表示装置およびその製造方法 |
DE102004046696A1 (de) * | 2004-05-24 | 2005-12-29 | Osram Opto Semiconductors Gmbh | Verfahren zur Montage eines Oberflächenleuchtsystems und Oberflächenleuchtsystem |
DE602005014374D1 (de) * | 2004-11-30 | 2009-06-18 | Sharp Kk | Lampenhalter, beleuchtungsvorrichtung für eine anzeigevorrichtung mit dem lampenhalter, anzeigevorrichtung mit der anzeigevorrichtung und flüssigkristallanzeigevorrichtung mit der beleuchtungsvorrichtung für eine anzeigevorrichtung |
CN201097048Y (zh) * | 2007-08-17 | 2008-08-06 | 比亚迪股份有限公司 | 背光模块 |
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2009
- 2009-09-07 US US13/127,070 patent/US20110211134A1/en not_active Abandoned
- 2009-09-07 CN CN200980147540XA patent/CN102227585A/zh active Pending
- 2009-09-07 WO PCT/JP2009/065568 patent/WO2010061676A1/ja active Application Filing
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JP2002279821A (ja) * | 2001-03-19 | 2002-09-27 | Mitsubishi Electric Corp | 照明装置 |
WO2008050509A1 (fr) * | 2006-10-27 | 2008-05-02 | Sharp Kabushiki Kaisha | Dispositif source de lumière, dispositif de rétroéclairage et afficheur à cristaux liquides |
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WO2013069592A1 (ja) * | 2011-11-09 | 2013-05-16 | シャープ株式会社 | 照明装置、表示装置及びテレビ受信装置 |
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