WO2011086789A1 - 照明装置、表示装置、テレビ受信装置 - Google Patents
照明装置、表示装置、テレビ受信装置 Download PDFInfo
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- WO2011086789A1 WO2011086789A1 PCT/JP2010/071882 JP2010071882W WO2011086789A1 WO 2011086789 A1 WO2011086789 A1 WO 2011086789A1 JP 2010071882 W JP2010071882 W JP 2010071882W WO 2011086789 A1 WO2011086789 A1 WO 2011086789A1
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- light
- light source
- lighting device
- light guide
- light emitting
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- Display devices such as a liquid crystal panel may cause a phenomenon in which an image has a tail when displaying a moving image.
- Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique that suppresses an image tailing phenomenon by executing a backlight scan for lighting a light source side in synchronization with an image writing position on a liquid crystal panel side.
- a backlight scan it is necessary to provide a light guide plate for each light source constituting each channel, and the light guide plate is divided into a plurality of blocks.
- each block which comprises a light-guide plate by heat_generation
- the position of each block BK will not be determined, and as shown in FIG. Stop to the right.
- the block BK is shifted to the left side (BK1, BK3, BK5), the left side close to the light source H becomes bright and the right side far from the light source H becomes dark.
- the present invention has been completed based on the above-described circumstances, and an object thereof is to suppress unevenness in luminance of a lighting device.
- the illuminating device (first illuminating device) according to the present invention includes a plurality of light source pairs, each consisting of a pair of point light sources arranged at equal distances from the center line and facing the projection axes, along the center line.
- a plurality of light source devices arranged in pairs and provided individually corresponding to each of the light source pairs, and a plurality of light source devices arranged between the light source pairs so that both end faces in the longitudinal direction face the point light sources
- the central portion in the longitudinal direction of the light guide member is positioned on the center line corresponding to the middle position of the light source pair. Therefore, the distance from the point light source to the end face of the light guide member is the same on both the left and right sides.
- the light guide member heat shrinks as the light source generates heat, but the distance from the light source to the end face does not become uneven on both the left and right sides because the right and left sides of the centered portion are similarly shrunk. , Always kept at the same distance. Therefore, when the light source is turned on, each light guide member always emits light uniformly on both the left and right sides with the center line as a boundary, and luminance unevenness does not occur.
- the positioning part consists of the protrusion provided in any one of the said container or the said light guide member, and the receiving part which is provided in the other side and fits the said protrusion. In this way, since the position of the light guide member is determined simply by fitting the protrusion to the receiving portion, the positioning operation can be performed easily and without trouble. Moreover, since the number of parts does not increase, cost merit is high.
- the positioning portion is provided at the center portion of the light guide member and at a position avoiding the front of the point light source. If it is such a structure, a positioning part will remove
- An illumination device (second illumination device) of the present invention is a light source device in which a light source pair composed of a pair of light sources arranged equidistantly from a center line and arranged facing each other is disposed along the center line.
- a single light guide plate disposed between the light source pair so that both longitudinal end faces thereof face the light source, a housing for housing the light source device and the light guide plate, and the light guide plate And a positioning part for positioning the central part in the longitudinal direction on the center line.
- the central portion in the longitudinal direction of the light guide plate is positioned on the center line corresponding to the intermediate position of the light source pair. Therefore, the distance from the light source to the end face of the light guide plate is the same distance on both the left and right sides.
- the light guide plate thermally contracts with the heat generated by the light source, but the left and right sides with the center part positioned as the boundary shrink in the same way, so the distance from the light source to the end surface is not uneven on the left and right sides, Always kept at the same distance. For this reason, when the light source is turned on, the light guide plate always emits light uniformly on both the left and right sides with the center line as a boundary, and luminance unevenness does not occur.
- the positioning part consists of the protrusion provided in any one of the said container or the said light-guide plate, and the receiving part which is provided in the other side and fits the said protrusion. In this way, the position of the light guide plate is determined simply by fitting the protrusion to the receiving portion, so that the positioning operation can be performed easily and without trouble. Moreover, since the number of parts does not increase, cost merit is high.
- the positioning portion is provided at the central portion of the light guide plate and outside the display area of the liquid crystal display panel. With such a configuration, it is possible to remove the positioning portion from the display area, so there is almost no influence on the display performance.
- the following configuration is preferable as an embodiment of the two lighting devices (first and second lighting devices) of the present invention.
- the light source device is a point light source array in which the point light sources constituting the light source pair are arranged in a line on a substrate extending in parallel with the center line. If it does in this way, it will become possible to assemble a plurality of point light sources to a container collectively, and assembly workability will be good.
- -It is set as the structure which attaches the said point light source array to the said container.
- both the point light source array and the light guide member (or light guide plate) are attached to a common member (container), so the point light source array and the light guide member (or light guide member). Positioning with the optical plate can be performed with high accuracy.
- a reflection member that reflects the light from the point light source is provided on the substrate. If it does in this way, the incident efficiency with respect to the light guide member of the light radiate
- the reflecting member is preferably a reflecting sheet (foamed PET reflecting sheet, multilayer film reflecting sheet, etc.) or a resist that reflects light.
- the point light source is a white light emitting diode. In this way, it is possible to extend the life of the point light source and reduce power consumption.
- the white light emitting diode may include a light emitting chip that emits blue light and a phosphor layer that is formed around the light emitting chip and has a light emission peak in a yellow region. With such a configuration, the white light emitting diode can be made into one chip.
- the white light emitting diode may include a light emitting chip that emits blue light and a phosphor layer that is formed around the light emitting chip and has emission peaks in a green region and a red region.
- the white light emitting diode includes a light emitting chip that emits blue light, a phosphor layer that is formed around the light emitting chip and has a light emission peak in a green region, and a light emitting chip that emits red light. I can do it.
- the white light emitting diode may include a light emitting chip that emits blue light, a light emitting chip that emits green light, and a light emitting chip that emits red light. According to this configuration, the color tone is averaged as a whole, and illumination light having a substantially uniform color tone can be obtained.
- the white light emitting diode may be configured to include a light emitting chip that emits ultraviolet light and a phosphor layer formed around the light emitting chip.
- the phosphor layer includes: It is preferable that the blue region, the green region, and the red region have emission peaks. In this way, the color tone is averaged as a whole, and illumination light with a substantially uniform color tone can be obtained.
- the display device of the present invention includes the above-described illumination device and a liquid crystal display panel that performs display using light from the illumination device. Furthermore, the television receiver of the present invention includes the display device. Such a display device can be applied to a display of a television or a personal computer, for example, and is particularly suitable for a large screen.
- the illuminating device without a brightness nonuniformity can be provided.
- a display device and a television receiver using the lighting device can be provided.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- the exploded perspective view which shows schematic structure of the display apparatus with which a television receiver is equipped.
- the top view of the illuminating device which shows the positional relationship of a LED array and a light guide block Sectional drawing which shows the structure of LED (light emitting diode) Sectional drawing which shows the structure of LED (light emitting diode) Sectional drawing which shows the structure of LED (light emitting diode) LED array perspective view Sectional drawing which cut
- the disassembled perspective view which shows schematic structure of the display apparatus which concerns on Embodiment 3 of this invention.
- the top view of the illuminating device which shows the positional relationship of a LED array and a light guide block Sectional drawing which cut
- the top view which shows the modification of a light source device Plan view showing the conventional structure of the lighting device
- the television receiver TV includes a display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the display device 10, a power supply PW, a tuner T, and a stand S. And is configured.
- the display device 10 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 11 that is a display panel and an illumination device 21 that is an external light source.
- the horizontal direction (longitudinal direction) of the display device 10 is assumed to be the X direction
- the height direction (short direction) of the display device 10 is assumed to be the Y direction
- the depth direction of the display device 10 is assumed to be the Z direction.
- the center line Lc is a straight line that passes through the center of the liquid crystal display panel 11 in the X direction and extends in the Y direction (FIG. 3).
- the liquid crystal panel 11 has a horizontally long rectangular shape as shown in FIG.
- the liquid crystal panel 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates.
- 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 arranged outside both substrates.
- the illuminating device 21 includes a light guide plate 30, LED arrays (an example of the “point light source array” of the present invention) 40 ⁇ / b> R and 40 ⁇ / b> L constituting the light source device U, an optical sheet 80, and the like.
- a chassis (an example of the “accommodating body” in the present invention) 60 to be accommodated and a pressing member 90 are provided.
- the chassis 60 is made of metal and has a horizontally long rectangular shape, and has a symmetrical shape with respect to the center line Lc.
- the chassis 60 includes a bottom plate 61 and side plates 65 that rise from the outer ends of the respective sides of the bottom plate 61, and has a shallow box shape that opens toward the surface side that is the display surface side (see FIG. 3).
- both side plates 65R and 65L in the X direction serve as attachment surfaces, and the LED array faces the inner wall of each side plate 65R and 65L with the light emitting surface facing inward. 40R and 40L are attached.
- the LED arrays 40R and 40L are composed of a substrate 41 and LEDs (an example of the “point light source” of the present invention) 45 mounted on the substrate 41.
- the substrate 41 is made of the same metal as the chassis 60, such as an aluminum material, and has a structure in which a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer.
- the substrate 41 extends in parallel along the center line Lc shown in FIG. 3, and a plurality of LEDs (Light Emitting Diodes / Light Emitting Diodes) 45 are arranged on the surface at regular intervals (in this example, five). Has been placed.
- LEDs Light Emitting Diodes / Light Emitting Diodes
- the LED arrays 40R and 40L are arranged equidistant from the center line Lc as shown in FIG.
- the LEDs 45 mounted on the LED arrays 40R and 40L face the projection axis C, and the two LEDs 45 facing left and right constitute a light source pair P. That is, in this example, five sets of LEDs 45 face each other, and thus five sets of light source pairs P1 to P5 are formed.
- the LED 45 has three sets of light emitting chips 46B, 46G, and 46R that emit blue, green, and red as shown in FIG. 4 arranged side by side and sealed with a transparent resin 49.
- the plan view has a rectangular shape.
- the LED 45 emits white light by mixing three colors when the three light emitting chips 46B, 46G, and 46R are simultaneously turned on.
- the configuration of the LED 45 can include a light emitting chip 46B that emits blue light and a phosphor layer 48 that is formed around the light emitting chip 46B and covers the light emitting chip 46B.
- the phosphor layer 48 is formed, for example, by dispersing phosphor particles in a transparent resin or binder, and has a light emission peak in a yellow region corresponding to a blue complementary color.
- the phosphor layer 48 causes the light emitting chip 46B to emit light, the phosphor particles are excited to emit yellow light. Therefore, the LED 45 emits white light by mixing blue and yellow (see FIG. 5).
- the LED 45 can be composed of a light emitting chip 46B that emits blue light and a next phosphor layer 48 formed around the light emitting chip 46B.
- the phosphor layer 48 is obtained by containing fluorescent agent particles in a transparent resin or binder, and has emission peaks in green and red regions, respectively. With such a configuration, the LED 45 emits white light by mixing each color (blue, green, red) (see FIG. 5).
- the LED 45 can be composed of a light emitting chip 46P that emits ultraviolet light and a phosphor layer 48 that is formed around the light emitting chip 46P and covers the light emitting chip 46P (see FIG. 6).
- the phosphor layer 48 is obtained by dispersing phosphor particles in a transparent resin or binder, and has emission peaks in the blue region, the green region, and the red region, respectively.
- the LED 45 emits white light by mixing these three colors. It becomes.
- a reflective sheet (an example of the “reflective member” of the present invention) 42 is disposed on the surface of the substrate 41.
- the reflection sheet 42 is formed over the entire length in the longitudinal direction of the substrate 41 and is configured to cover an area of the substrate surface excluding the arrangement position of the LEDs 45 without any gap.
- the reflection sheet 42 functions to reflect the light emitted from the LED 45 toward the light guide plate 30 described below.
- the reflective sheet 42 can be a foamed PET reflective sheet or a multilayer reflective sheet.
- the foamed PET reflective sheet is a reflective sheet using white foamed PET (polyethylene terephthalate) as a resin base material.
- the multilayer reflective sheet ESR Enhanced Specular Reflector is a reflective sheet having a high reflectance in the visible light range due to a multilayer structure using a polyester resin.
- the bottom plate 61 of the chassis 60 is a flat surface, and the light guide plate 30 is disposed at the center with the surface F, which is a light emitting surface, facing upward.
- the light guide plate 30 guides incident light to the surface F side which is a light emitting surface.
- the light guide plate 30 is divided into five light guide blocks (an example of the “light guide member” of the present invention) 31 to 35 corresponding to the five pairs of light sources P.
- Each of the light guide blocks 31 to 35 is formed of a highly transparent resin (such as acrylic).
- Each of the light guide blocks 31 to 35 has a prismatic shape extending in the direction of the projection axis C, and a reflection sheet 37 is bonded to the back surface B side.
- the five light guide blocks 31 to 35 have the same shape (the same total length), and the total length is set shorter than the facing distance Lp between the LEDs (see FIG. 3).
- Each of the light guide blocks 31 to 35 is disposed laterally between the light source pair P so that the axis line is along the light projection axis C, and the left and right end surfaces (light incident surfaces) E are arranged on the light source pair P. Are opposed to the left and right LEDs 45, respectively.
- Each of the light guide blocks 31 to 35 is configured such that the central portion in the longitudinal direction is positioned on the center line Lc by the positioning portion S described below. More specifically, on the bottom plate 61 of the chassis 60 and on the center line Lc corresponding to the intermediate position of the light source pair P, five protrusions 71 to 75 are provided in a line. These five protrusions 71 to 75 have a cylindrical shape and protrude toward the light guide blocks 31 to 35. The protrusions 71 to 75 may be configured to be formed integrally with the bottom plate 61 of the chassis 60 or separate.
- each light guide block 31 to 35 and at the center in the longitudinal direction receiving portions 31A to 35A that are counterparts of the protrusions 71 to 75 are formed.
- the receiving portions 31A to 35A are circular recesses corresponding to the shapes of the protrusions 71 to 75, and are configured to fit the protrusions 71 to 75 without a gap (see FIG. 8).
- the light guide blocks 31 to 35 are positioned at the center in the longitudinal direction on the center line Lc as shown in FIG.
- the left and right lengths mr and ml around the center line Lc are equal. Therefore, the distance (gap) Dr from the right end surface E of the light guide blocks 31 to 35 to the LED 45 is equal to the distance (gap) Dl from the left end surface E of the light guide block to the LED 45.
- the distance Dr to the LED 45 and the distance Dl are the same for all the light guide blocks 31 to 35.
- the distances Dr and Dl between the two are as follows: The dimension is set such that a certain gap is secured between the LED 45 and the end face E when the total length of the light guide blocks 31 to 35 is the longest.
- the positioning portion S is positioned close to the lower edge of each light guide block 31 to 35.
- the positional relationship that avoids the front of the LED 45 in other words, the positional relationship that avoids the line connecting the left and right LEDs 45, 45 constituting the light source pair P sandwiching each of the light guide blocks 31 to 35.
- FIG. 3 in order to make it easy to understand that the light guide blocks 31 to 35 are separated, a diagram is shown in which a gap is provided between the light guide blocks 31 to 35. However, the light guide blocks 31 to 35 are in close contact with each other.
- the optical sheet 80 has a horizontally long rectangular shape like the liquid crystal panel 11 and has a thin sheet shape.
- the optical sheet 80 include a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected from these.
- the optical sheet 80 is arranged so as to overlap the surface F side of the light guide plate 30 and is configured to cover the surface F of the light guide plate 30 over the entire surface.
- the pressing member 90 is formed in a frame shape extending along the outer peripheral end of the light guide plate 30 as shown in FIG.
- the holding member 90 is made of synthetic resin (black type with high light shielding properties) and has an L-shaped cross section.
- the pressing member 90 is mounted so as to cover the chassis 60, the side wall 95 of the pressing member 90 is fitted to the outside of the side plate 65 of the chassis 60, and each light guide block 31 constituting the light guide plate 30 by the front wall 91. It is configured to overlap with the outer peripheral edges of .about.35. As a result, the positions of the light guide blocks 31 to 35 can be regulated in the depth direction (Z direction).
- the liquid crystal panel 11 is arranged on the front surface side of the pressing member 90 so as to overlap the outer peripheral edge portion with the front wall 91. Then, the frame-shaped bezel 13 is attached from the surface side of the liquid crystal panel 11 so that the liquid crystal panel 11 is integrally held with respect to the lighting device 21.
- the illumination device 21 has a configuration in which the light source pair P is controlled to be turned on (so-called backlight scanning) in synchronization with image writing on the liquid crystal panel 11 side (image writing to pixels).
- the light source pair P corresponding to the image writing position is turned on (specifically, the left and right LEDs 45 constituting the light source pair P are turned on simultaneously)
- the light is applied to the end faces E of the light guide blocks 31 to 35.
- the light then enters the light guide block 30 while being scattered. And it reflects to the surface F side which is a light-projection surface by the reflective sheet 37 provided in the back surface B of the light guide block 30.
- the surface F of the light guide blocks 31 to 35 corresponding to the position corresponding to the image writing position emits strong light to illuminate the liquid crystal panel 11 (specifically, the image writing position) from the back side.
- the light source pair P is turned off and the illumination is not turned on. By doing so, it becomes possible to suppress the tailing phenomenon of the image and to improve the image quality.
- the central portions in the longitudinal direction of the light guide blocks 31 to 35 are positioned on the center line Lc. Therefore, the distances Dr and Dl from the LED 45 to the end faces E of the light guide blocks 31 to 35 are the same on both the left and right sides.
- the light guide blocks 31 to 35 are thermally contracted with the heat generation of the LED 45, but both the left and right sides of the centered portion are similarly contracted. Therefore, the distances Dr, Dl from the LED 45 to the end surface E are It is not uneven on both sides and is always kept at the same distance. For this reason, when the LED 45 is turned on, each of the light guide blocks 31 to 35 always emits light uniformly on both the left and right sides with the center line Lc as a boundary, and luminance unevenness does not occur.
- both the LED arrays 40R and 40L and the light guide blocks 31 to 35 are attached to a common member (chassis 60 which is a container). Therefore, the LED arrays 40R and 40L and the light guide blocks 31 to 35 can be positioned with high accuracy. With such a configuration, it is difficult for errors to occur in the distances Dr and Dl, so that uneven brightness is further unlikely to occur.
- the positioning portion S is provided on the lower edge side of each light guide block 31 to 35, avoiding the front of the LED 45. If it is such a structure, the positioning part S will remove
- the positioning portion is composed of the protrusions 71 to 75 and the receiving portions 31A to 35A, and the positions of the light guide blocks 31 to 35 are determined simply by fitting them together. Work can be done easily and without trouble. Moreover, since the number of parts does not increase, cost merit is high.
- an LED (light emitting diode) is used as a light source. In this way, the life of the light source can be extended and the power consumption can be reduced.
- the reflection sheet 42 is provided on each substrate 41 constituting the LED arrays 40R and 40L. In this way, the incident efficiency of the light emitted from the LED 45 with respect to the light guide blocks 31 to 35 can be increased.
- the positioning portion S is provided with projections 71 to 75 on the chassis 60 side, and provided with receiving portions 31A to 35A for fitting the projections 71 to 75 on the light guide blocks 31 to 35 side. Illustrated.
- the configuration of the positioning portion S is reversed with respect to the first embodiment, and as shown in FIG. 10, projections 131A to 135A are provided on the light guide blocks 131 to 135 side.
- the bottom plate 61 of the chassis 60 is provided with receiving portions (holes) 121 to 125 for fitting the protrusions 131A to 135A.
- the projections 131A to 135A of the light guide blocks 131 to 135 are fitted into the receiving portions 121 to 125 on the chassis 60 side, so that the center of the light guide blocks 131 to 135 in the longitudinal direction is fitted.
- the part can be positioned on the center line Lc. Therefore, the distances Dr and Dl from the LED 45 to the end surfaces E of the light guide blocks 131 to 135 can be made the same distance on both the left and right sides, and the same effect (reduction in luminance unevenness) as in the first embodiment can be achieved. Is possible.
- Embodiment 3 a third embodiment of the present invention will be described with reference to FIGS.
- the first embodiment as a configuration example of the lighting device 21, a configuration in which the light guide plate 30 is divided into a plurality of light guide blocks 31 to 35 is illustrated.
- the illuminating device 221 of Embodiment 3 is different from Embodiment 1 in that the light guide plate 230 is not divided and configured from a single flat plate, and the installation position of the positioning unit S is changed.
- Other configurations (light source device U, chassis 60, etc.) are the same as those in the first embodiment.
- the light guide plate 230 is formed of a highly transparent resin (acrylic or the like) and has a horizontally long rectangular shape substantially the same shape as the liquid crystal panel 11. Yes.
- the total length L of the light guide plate 230 is set shorter than the facing distance Lp between the LEDs, and a reflection sheet 235 is bonded to the back surface B side.
- the light guide plate 230 is disposed in the center of the bottom plate 61 of the chassis 60 with the surface F facing up. Specifically, as shown in FIG. 12, the left and right end surfaces (light incident surfaces) E are arranged between the light source pair P while facing the left and right LEDs 45.
- the light guide plate 230 is configured such that the central portion in the longitudinal direction (X direction) is positioned on the center line Lc by the positioning portion S described below.
- two protrusions 171 and 172 are provided on the center line Lc, which is the bottom plate 61 of the chassis 60, which is the middle position of the light source pair P. Specifically, they are provided on the center line Lc and at the upper and lower ends in the Y direction. These protrusions 171 to 172 have a columnar shape and protrude toward the light guide plate 230 side.
- the protrusions 171 and 172 may have either a structure that is formed integrally with the bottom plate 61 of the chassis 60 or a structure that is formed separately.
- receiving portions 231 to 232 that are counterparts to the protrusions 171 and 172 are formed.
- the receiving portions 231 and 232 are located in the center portion of the light guide plate 230 and at both ends in the Y direction.
- the receiving portions 231 and 232 are circular recesses corresponding to the shapes of the protrusions 171 and 172, and are configured to fit the protrusions 171 and 172 without a gap (see FIG. 13).
- the light guide plate 230 is in the longitudinal direction (X direction) as shown in FIG.
- the central portion is positioned on the center line Lc, and the left and right lengths mr and ml around the center line Lc are equal. Therefore, the distance (gap) Dr from the right end surface E of the light guide plate 230 to the LED 45 is equal to the distance (gap) Dl from the left end surface E of the light guide plate 230 to the LED 45.
- the same effect as in the first embodiment can be obtained. That is, the light guide plate 230 is thermally contracted with the heat generation of the LED 45, but both the left and right sides of the positioned central portion are similarly contracted. Therefore, the distances Dr and Dl from the LED 45 to the end face E are not the same on both the left and right sides. It is not uniform and is always kept at the same distance. For this reason, when the LED 45 is turned on, the left and right sides of the light guide plate 230 with the center line Lc as a boundary always emit light uniformly, and luminance unevenness does not occur.
- the position of the positioning portion S is preferably outside the display area (square area indicated by a two-dot chain line in FIG. 12) H of the liquid crystal display panel.
- the positioning area S is arranged at both ends in the Y direction so that the display area H is removed. In this way, the positioning part S does not affect the display performance.
- the positioning portion S is out of the display area H is also out of the LED 45. Therefore, it is not necessary to pay attention to the relationship between the LED arrays 40R and 40L and the positioning portion S and determine the positions. Therefore, the degree of freedom in layout increases.
- an illumination device in which the light guide plate 230 is configured by a single flat plate cannot perform backlight scanning. Therefore, it is not always necessary to use a point light source (LED) for the light source device U, and instead, it is possible to use a linear light source such as a cold cathode tube.
- LED point light source
- the protrusions 171 and 172 are provided on the chassis 60 side and the receiving parts 231 and 232 are provided on the light guide plate 230 side.
- the configuration of the positioning portion S can be reversed, and a protrusion may be provided on the light guide plate 230 side, while a receiving portion (hole) for fitting the protrusion to the bottom plate 61 of the chassis 60 may be provided.
- the protrusions (71 to 75, 131A to 135A, 171 and 172) constituting the positioning part S and the receiving parts (31A to 35A, 121 to 125, 231, 232)
- a circular shape is illustrated, but it is only necessary that the two (the projecting portion and the receiving portion) can be fitted to each other, and a shape other than a circular shape, for example, a rectangular shape may be used.
- the light source pair P is configured by a pair of LEDs 45.
- the light source pair P only needs to be a pair of LEDs 45. As shown in FIG. A pair (three pairs in the figure) of LEDs 45 can be used.
- the LED 45 is given as an example of a point light source, but in addition, an incandescent bulb having a filament can be used.
- a reflection sheet (foamed PET reflection sheet, multilayer reflection sheet, etc.) is given as an example of the “reflection member” of the present invention, but on the surface of the substrate 41 instead of the reflection sheet 42
- a white solder resist containing a highly light reflective material such as titanium oxide, barium titanate, or polycarbonate may be applied. In this case, the thickness can be reduced compared to the reflective sheet.
- a TFT is used as a switching element of a display device (liquid crystal display device).
- a liquid crystal display device using a switching element other than TFT for example, a thin film diode (TFD)
- TFT thin film diode
- the present invention can be applied, and can be applied to a liquid crystal display device for monochrome display in addition to a liquid crystal display device for color display.
- the television receiver provided with the tuner is exemplified.
- the present invention can also be applied to a display device that does not include the tuner.
- the LED 45 can be used as long as it emits white light other than those described in the first embodiment, and the following can be used.
- the LED 45 includes a light emitting chip 46B that emits blue light, a phosphor layer 48 that is formed around the light emitting chip 46B and has a light emission peak in a green region, and a light emitting chip 46R that emits red light. If it is set as such a structure, LED45 will light-emit white by mixing of each color (blue, green, red).
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Abstract
Description
ところで、光源の発熱により導光板を構成する各ブロックは熱収縮を起こすから、光源と各ブロックとの間には隙間を設けなければならない。しかし、隙間があると、各ブッロクBKの位置が定まらず、図15に示すように、一部のブッロクBK1、BK3、BK5は図中左側に寄り、一部のブロックBK2、BK4は図中の右側に寄る。すると、ブロックBKが左側に寄ったところ(BK1、BK3、BK5)では、光源Hに近くなる左側が明るくなり、光源Hに遠くなる右側が暗くなる。また、ブロックBKが右側に寄ったところ(BK2、BK4)では、上記とは逆に、光源Hに近くなる右側が明るくなり、光源Hに遠くなる左側が暗くなる。従って、各ブロックBK1~BK5間で明暗がばらばらになり、輝度むらが出来てしまう。尚、この種の輝度むら(左右で明暗が出来る輝度むら)は、導光板が分割されていない構造の場合にも、生じ得る。
本発明の照明装置(第一の照明装置)は、中心線から等距離にあって投光軸を向かい合わせて配置された点状光源の対からなる光源対を、前記中心線に沿って複数組配置してなる光源装置と、前記各光源対に対応して個々に設けられると共に、長手方向の両端面を前記点状光源に向かい合わせるようにして前記光源対の間に配置された複数の導光部材と、前記光源装置と前記複数の導光部材とを収容する収容体と、前記各導光部材の長手方向の中央部を前記中心線上に位置決めする位置決め部とを備える。
・前記位置決め部は、前記収容体又は前記導光部材のいずれか一方に設けられた突部と、他方側に設けられ前記突部を嵌合させる受け部と、からなる。このようにすれば、突部を受け部に嵌合させるだけで導光部材の位置が決まるので、位置決め作業を手間なく簡単に行うことが出来る。また、部品点数が増えないので、コストメリットが高い。
・前記位置決め部は、前記収容体又は前記導光板のいずれか一方に設けられた突部と、他方側に設けられ前記突部を嵌合させる受け部と、からなる。このようにすれば、突部を受け部に嵌合させるだけで導光板の位置が決まるので、位置決め作業を手間なく簡単に行うことが出来る。また、部品点数が増えないので、コストメリットが高い。
本発明によれば、輝度むらのない照明装置を提供することが出来る。また、その照明装置を用いた表示装置、テレビ受信装置を提供することができる。
本発明の実施形態1を図1~図9によって説明する。本実施形態に係るテレビ受信装置TVは、図1に示すように、表示装置10と、当該表示装置10を挟むようにして収容する表裏両キャビネットCa,Cbと、電源PWと、チューナーTと、スタンドSとを備えて構成される。
次に、本発明の実施形態2を図10によって説明する。実施形態1では、位置決め部Sとして、シャーシ60側に突部71~75を設ける一方、導光ブロック31~35側に突部71~75を嵌合させる受け部31A~35Aを設けたものを例示した。
次に、本発明の実施形態3を図11ないし図13によって説明する。実施形態1では、照明装置21の構成例として、導光板30を複数個の導光ブロック31~35に分割した構成のものを例示した。実施形態3の照明装置221は導光板230を分割せず単一枚の平板から構成している点と、位置決め部Sの設置位置を変更している点が、実施形態1と相違しており、それ以外の構成(光源装置U、シャーシ60など)は、実施形態1と同じ構成となっている。
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 (21)
- 中心線から等距離にあって投光軸を向かい合わせて配置された点状光源の対からなる光源対を、前記中心線に沿って複数組配置してなる光源装置と、
前記各光源対に対応して個々に設けられると共に、長手方向の両端面を前記点状光源に向かい合わせるようにして前記光源対の間に配置された複数の導光部材と、
前記光源装置と前記複数の導光部材とを収容する収容体と、
前記各導光部材の長手方向の中央部を前記中心線上に位置決めする位置決め部とを備える照明装置。 - 前記位置決め部は、前記収容体又は前記導光部材のいずれか一方に設けられた突部と、他方側に設けられ前記突部を嵌合させる受け部と、からなる請求項1に記載の照明装置。
- 前記位置決め部は、前記導光部材の前記中央部であって、前記点状光源の正面を避けた位置に設けられている請求項1又は請求項2に記載の照明装置。
- 中心線から等距離にあって向かい合わせて配置された光源の対からなる光源対を、前記中心線に沿って配置してなる光源装置と、
長手方向の両端面を前記光源に向かい合わせるようにして前記光源対の間に配置された単一枚の導光板と、
前記光源装置と前記導光板とを収容する収容体と、
前記導光板の長手方向の中央部を前記中心線上に位置決めする位置決め部とを備える照明装置。 - 前記位置決め部は、前記収容体又は前記導光板のいずれか一方に設けられた突部と、他方側に設けられ前記突部を嵌合させる受け部と、からなる請求項4に記載の照明装置。
- 前記光源は、点状光源である請求項4又は請求項5に記載の照明装置。
- 前記光源装置は、前記中心線に平行に延びる基板上に、前記光源対を構成する前記点状光源を一列状に配置した点状光源アレイである請求項1、請求項2、請求項3、請求項6のいずれか一項に記載の照明装置。
- 前記点状光源アレイは、前記収容体に取り付けられている請求項7に記載の照明装置。
- 前記基板上には、前記点状光源の光を反射させる反射部材が設けられている請求項7又は請求項8に記載の照明装置。
- 前記反射部材は、発泡PET反射シートであることを特徴とする請求項9に記載の照明装置。
- 前記反射部材は、多層膜反射シートであることを特徴とする請求項9に記載の照明装置。
- 前記反射部材は、光を反射するレジストであることを特徴とする請求項9に記載の照明装置。
- 前記点状光源は、白色発光ダイオードである請求項1、請求項2、請求項3、請求項6、請求項7、請求項8、請求項9、請求項10、請求項11、請求項12のいずれか1項に記載の照明装置。
- 前記白色発光ダイオードは、青色に発光する発光チップと、前記発光チップの周囲に形成され黄色の領域に発光ピークを持つ蛍光体層と、を含む請求項13に記載の照明装置。
- 前記白色発光ダイオードは、青色に発光する発光チップと、前記発光チップの周囲に形成され緑色の領域と赤色の領域にそれぞれ発光ピークを持つ蛍光体層と、を含む請求項13に記載の照明装置。
- 前記白色発光ダイオードは、青色に発光する発光チップと、前記発光チップの周囲に形成され緑色の領域に発光ピークを持つ蛍光体層と、赤色に発光する発光チップと、を含む請求項13に記載の照明装置。
- 前記白色発光ダイオードは、青色に発光する発光チップと、緑色に発光する発光チップと、赤色に発光する発光チップと、を含む請求項13に記載の照明装置。
- 前記白色発光ダイオードは、紫外光を発光する発光チップと、前記発光チップの周期に形成され青色の領域と緑色の領域と赤色の領域にそれぞれ発光ピークを持つ蛍光体層と、を含む請求項13に記載の照明装置。
- 請求項1ないし請求項18のいずれか一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液晶表示パネルと、を備える表示装置。 - 請求項4ないし請求項6のいずれか一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液晶表示パネルと、を備え、
前記位置決め部は、前記導光板の前記中央部であって、前記液晶表示パネルの表示領域の外側に設けられている表示装置。 - 請求項19又は請求項20に記載の表示装置を備えるテレビ受信装置。
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BR112012017650A BR112012017650A2 (pt) | 2010-01-18 | 2010-12-07 | Dispositivo de iluminação, dispositivo de exibição e receptor de televisão |
JP2011549875A JP5368586B2 (ja) | 2010-01-18 | 2010-12-07 | 照明装置、表示装置、テレビ受信装置 |
RU2012130179/07A RU2509259C1 (ru) | 2010-01-18 | 2010-12-07 | Устройство освещения, устройство отображения и телевизионный приемник |
EP10843144A EP2505908A1 (en) | 2010-01-18 | 2010-12-07 | Lighting device, display apparatus, and television receiver apparatus |
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BR112012017650A2 (pt) | 2017-10-03 |
JP5368586B2 (ja) | 2013-12-18 |
US20120300136A1 (en) | 2012-11-29 |
RU2509259C1 (ru) | 2014-03-10 |
CN102713412A (zh) | 2012-10-03 |
JPWO2011086789A1 (ja) | 2013-05-16 |
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