WO2009090786A1 - 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
- WO2009090786A1 WO2009090786A1 PCT/JP2008/069061 JP2008069061W WO2009090786A1 WO 2009090786 A1 WO2009090786 A1 WO 2009090786A1 JP 2008069061 W JP2008069061 W JP 2008069061W WO 2009090786 A1 WO2009090786 A1 WO 2009090786A1
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- WIPO (PCT)
- Prior art keywords
- light source
- optical sheet
- light
- cover
- liquid crystal
- 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
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- a backlight device is separately required as a lighting device.
- a backlight device includes, for example, a plurality of backlights arranged in parallel, a lamp holder that covers an end portion of the backlight, and a diffusion plate disposed on the lamp holder as disclosed in Patent Document 1 And so on are known.
- the lamp holder disclosed in Patent Document 1 has a function of fixing a backlight to a rear chassis and a function of supporting an optical sheet such as a diffusion plate.
- the lamp holder is a member that covers the backlight, it is preferable that the lamp holder is formed with a narrow width from the viewpoint of increasing the luminance of the peripheral portion and improving luminance unevenness, and the portion that covers the backlight is reduced as much as possible.
- an optical sheet such as a diffusion plate cannot be stably supported.
- the present invention has been made based on the above circumstances, and can contribute to an increase in luminance and luminance unevenness in the peripheral portion, and can stably support an optical sheet such as a diffusion plate. Further, it is an object of the present invention to provide an illuminating device having a configuration capable of contributing to thinning of a liquid crystal display device (display device). Another object of the present invention is to provide a display device provided with such a lighting device, and a television receiver provided with such a display device.
- an illumination device includes a light source having a conductive portion at an end thereof, an optical sheet disposed on the light emission side of the light source, and a light-shielding property that covers the end of the light source.
- the optical sheet mounting portion is provided with a protrusion that protrudes toward the center of the light source.
- the cover member (particularly the cover portion) can be configured with a narrow width, it is possible to contribute to an increase in luminance at the peripheral portion and improvement in luminance unevenness.
- the projection member projecting toward the center side of the light source is formed on the optical sheet placement portion formed on the light emitting side surface of the cover portion in the cover member, the optical sheet placement portion and the projection portion are formed. Both of the optical sheets can be supported.
- the optical sheet mounting portion can be supplementarily supported by the protrusions, and in addition to realizing stable support of the optical sheet, the optical sheet It is possible to make the mounting surface area of the mounting portion, that is, the area of the cover portion and thus the width of the cover member as small as possible. As a result, the portion covering the end portion of the light source becomes narrow, and as a result, it is possible to realize an increase in luminance and an improvement in luminance unevenness in the peripheral portion corresponding to the end portion of the light source.
- the protrusion may have a placement surface that is on the same plane as the surface of the optical sheet placement portion. As described above, if the optical sheet placement portion and the projection portion have respective placement surfaces on the same plane, the optical sheet is suitably supported by the optical sheet placement portion and the projection portion. It becomes possible to do.
- the cover member may further include a light irradiation target object placement part for placing a light irradiation target object, the light irradiation target object placement part being disposed on a light emission side surface of the cover part. Can be formed on the light emission side with respect to the optical sheet placement portion.
- the light irradiation object for example, a liquid crystal panel
- the distance between the illumination device and the light irradiation object can be reduced as much as possible.
- an optical electronic apparatus such as a display device constituted by the illumination device and the light irradiation object.
- the cover sheet when irradiating the light irradiation object with illumination light emitted from the light source through the optical sheet, the cover sheet is lighted to make the optical sheet and the light irradiation object as close as possible and to simplify the configuration.
- the structure which mounts an irradiation target object is desirable. Therefore, the light irradiation target object mounting part is attached as in the present invention, but the light irradiation target object mounting part is simply provided by attaching the light irradiation target object mounting part to the light emitting side surface of the cover part.
- the area of the optical sheet placement portion is reduced by the area where the placement portion is formed, and the optical sheet cannot be stably supported.
- the optical sheet can be stably supported even when the light irradiation object placing portion is provided on the cover member in order to reduce the thickness. Therefore, it is possible to suitably realize the contradictory effects of stable support and thinning.
- the cover portion has a stepped surface, and the optical sheet placing portion is disposed on the first step surface of the stepped surface, and the light irradiation object placing portion is disposed on the second step surface.
- the height of each step is set to the optical sheet and the light irradiation object.
- the distance between the optical sheet and the object to be irradiated can be made as small as possible by designing the same as the thickness of the optical device.
- an optical electronic apparatus such as a display device constituted by the illumination device and the object to be irradiated with light. Can be made thinner.
- the light source is a linear light source, and includes a chassis that accommodates the linear light source, the linear light source is arranged in parallel on the inner surface of the chassis, and the cover member is disposed at an end of the chassis. Covering the end of the linear light source in an attached state, and having an inclined portion that protrudes from the cover portion toward the center of the light source and inclines toward the bottom surface of the chassis, It can project from the cover part within a range overlapping with the inclined part.
- the cover member is provided with the inclined portion as described above, the light from the light source can be directed in a predetermined direction by the inclined surface of the inclined portion, and the protrusion is covered within the range where the inclined portion overlaps the inclined portion.
- the surface of the said cover member shall have light reflectivity.
- the reflected light from the cover member it is possible to further increase the luminance with which the light irradiation object is irradiated, and to suitably suppress the occurrence of luminance unevenness.
- 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. According to such a display device, it is possible to realize a display with excellent quality without causing a decrease in luminance or luminance unevenness at the end of the light source.
- An example of the display panel is a liquid crystal panel.
- Such a display device can be applied as a liquid crystal display device to various uses, for example, a desktop screen of a television or a personal computer, and is particularly suitable as an ultra-thin television receiver.
- the invention's effect According to the present invention, it is possible to contribute to improvement of luminance increase and luminance unevenness in a peripheral portion, and to stably support an optical sheet such as a diffusion plate, and further to make a liquid crystal display device (display device) thinner. It becomes possible to provide the illuminating device provided with the structure which can also contribute to.
- the disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention.
- the disassembled perspective view which shows schematic structure of the liquid crystal display device with which the television receiver of FIG. 1 is provided.
- Sectional drawing which shows the cross-sectional structure along the short side direction of the liquid crystal display device of FIG.
- Sectional drawing which shows the cross-sectional structure along the long side direction of the liquid crystal display device of FIG.
- the perspective view which shows the surface side structure of a lamp holder.
- the perspective view which shows the back surface side structure of a lamp holder.
- the perspective view which expands and shows the principal part structure of a lamp holder.
- the perspective view which shows the surface side structure about the modification of a lamp holder.
- SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 14 ... Chassis, 15 ... Optical member (optical sheet), 15a ... Diffusing plate (optical sheet) , 17 ... Cold cathode tube (light source), 19 ... Relay connector (conductive portion), 20 ... Lamp holder (cover member), 20a ... First surface (optical sheet placement portion), 20b ... Second surface (light irradiation target) (Object placement part), 20z ... stepped surface (cover part), 26 ... inclined cover (inclined part), 71 ... projection part, 71a ... placement surface, TV ... television receiver
- FIG. 1 is an exploded perspective view showing a schematic configuration of the television receiver of the present embodiment
- FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. 1
- FIG. 3 is a liquid crystal display of FIG.
- FIG. 4 is an enlarged cross-sectional view of a main part showing a cross-sectional configuration along the long side direction of the liquid crystal display device of FIG. 2.
- 5 is a perspective view showing the configuration of the front side of the lamp holder of the backlight device included in the liquid crystal display device of FIG. 2
- FIG. 6 is a perspective view showing the configuration of the back side of the lamp holder
- FIG. It is a perspective view which expands and shows the principal part structure.
- the television receiver TV includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S.
- the liquid crystal display device (display device) 10 has a horizontally long rectangular shape as a whole and is accommodated in a vertically placed state.
- the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
- the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described (see FIGS. 2 to 4).
- the liquid crystal panel (display 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. Note that polarizing plates 11a and 11b are attached to the outside of both substrates (see FIGS. 3 and 4).
- the backlight device 12 includes an approximately box-shaped chassis 14 opened on the light emitting surface side (the liquid crystal panel 11 side) and an optical member attached so as to cover the opening 14 b of the chassis 14. 15 and a frame 16 that is disposed along the long side of the chassis 14 and holds the long side edge portion of the diffusion plate 15 a disposed on the chassis 14 side of the optical member 15 between the frame 14 and the chassis 14. . Further, in the chassis 14, a cold cathode tube (light source) 17, a lamp clip 18 for attaching the cold cathode tube 17 to the chassis 14, and a relay responsible for relaying electrical connection at each end of the cold cathode tube 17.
- a connector 19 and a lamp holder (cover member) 20 that collectively covers the ends of the cold cathode tube 17 group and the relay connector 19 group are provided.
- the optical member 15 side is the light emitting side from the cold cathode tube 17, and in this embodiment, the light emitting side (that is, the liquid crystal panel 11 side) of the optical member 15 is the light emitting unit. 15z.
- the chassis 14 is made of metal, has a rectangular bottom plate, and a folded outer edge portion 21 that rises from each side and is folded back in a substantially U shape (a folded outer edge portion 21a in a short side direction and a folded outer edge portion 21b in a long side direction). )).
- the bottom plate of the chassis 14 has a plurality of attachment holes 22 for attaching the relay connector 19 to both ends in the long side direction.
- a fixing hole 14c is formed in the upper surface of the folded outer edge portion 21b of the chassis 14, and the bezel 13, the frame 16, the chassis 14 and the like are integrated with, for example, screws. Is possible.
- a reflection sheet 23 is disposed on the inner surface side of the bottom plate of the chassis 14 (the surface side facing the cold cathode tube 17).
- the reflection sheet 23 is made of synthetic resin, and the surface thereof is white with excellent light reflectivity.
- the reflection sheet 23 is laid so as to cover almost the entire region along the inside of the bottom plate surface of the chassis 14. As shown in FIG. 3, the long side edge portion of the reflection sheet 23 rises so as to cover the folded outer edge portion 21 b of the chassis 14 and is fixed in a state sandwiched between the chassis 14 and the diffusion plate 15 a. With this reflection sheet 23, it is possible to reflect the light emitted from the cold cathode tube 17 toward the optical member 15.
- the cold-cathode tube 17 is a linear light source having an elongated tubular shape, in which the length direction (axial direction) coincides with the long side direction of the chassis 14 and a large number of them are arranged in parallel to each other. It is accommodated in the chassis 14 (that is, in a state of being arranged in parallel) (see FIG. 2).
- the cold cathode tube 17 is slightly lifted from the bottom plate (reflective sheet 23) of the chassis 14, and each end thereof is fitted into the relay connector 19 as a conductive portion as shown in FIG.
- a lamp holder 20 is attached so as to cover these relay connectors 19.
- the relay connector 19 including the electrode that is a non-light emitting portion formed at the end of the cold cathode tube 17 is covered with the lamp holder 20, and the shadow of the end is prevented from being visually recognized. Yes.
- the lamp holder 20 is made of a white synthetic resin having a light reflecting surface, covers the end of the cold cathode tube 17, and has a short side at the periphery of the chassis 14. It has a long and narrow, substantially box shape extending along the direction.
- the lamp holder 20 has a stepped surface (cover portion) 20z on the surface side on which a diffusing plate (optical sheet) 15a or a liquid crystal panel (light irradiation object) 11 can be placed stepwise. And is disposed so as to partially overlap the folded outer edge portion 21a in the short side direction of the chassis 14 and forms the side wall of the backlight device 12 together with the folded outer edge portion 21a.
- An insertion pin 24 protrudes from a surface of the lamp holder 20 facing the folded outer edge portion 21a of the chassis 14, and the insertion pin 24 is inserted into an insertion hole 25 formed on the upper surface of the folded outer edge portion 21a of the chassis 14.
- the lamp holder 20 is attached to the chassis 14.
- the stepped surface 20z of the lamp holder 20 consists of three surfaces parallel to the bottom plate surface of the chassis 14, and the short side edge portion of the diffusion plate 15a is mounted on the first surface (optical sheet mounting portion) 20a at the lowest position. Is placed. Further, an inclined cover (inclined portion) 26 that inclines toward the bottom plate surface of the chassis 14 extends from the first surface 20a. A short side edge portion of the liquid crystal panel 11 is placed on the second surface (light irradiation object placement portion) 20 b of the stepped surface of the lamp holder 20.
- the third surface 20 c at the highest position among the stepped surfaces of the lamp holder 20 is arranged at a position overlapping the folded outer edge portion 21 a of the chassis 14 and is in contact with the bezel 13.
- the stepped surface 20z of the lamp holder 20 constitutes a cover portion disposed on the upper surface side (light emitting side) of the cold cathode tube 17, and the first surface 20a is formed on the center side of the cold cathode tube 17.
- a protruding portion 71 is formed. That is, the protruding portion 71 extends from the end portion of the linear cold cathode tube 17 toward the central portion, in other words, the central portion of the backlight device 12 (specifically, the diffusion plate 15a mounted). It is formed in a shape protruding in the center side.
- the protruding portion 71 extends in parallel with the first surface (surface on the light emission side) 20a of the stepped surface (cover portion) 20z and protrudes, and has a mounting surface 71a that is flush with the first surface 20a.
- the short side edge portion of the diffusion plate 15a can be supported by the mounting surface 71a. That is, as shown in FIG. 4, the diffusion plate 15a is supported by the mounting surface 71a of the protrusion 71 and the first surface (mounting surface) 20a of the stepped surface 20z.
- the first surface 20 a is formed with a plurality of support convex portions 85 whose surfaces are partially raised, and the support convex portions 85 function as a mounting surface for the optical sheet 15. Accordingly, even when the optical sheet 15 is bent, the optical sheet 15 can be reliably supported while allowing the bending.
- the opening 72 for inserting the cold cathode tubes 17 is formed in the inclined cover 26 of the lamp holder 20 in the same number as the number of the cold cathode tubes 17.
- electrical conduction from an inverter board is performed in a portion (end portion) inserted inside the lamp holder 20 with respect to the opening 72.
- the inclined cover 26 protrudes from the first surface 20 a toward the center of the cold cathode tube 17, and the protrusion 71 described above is formed on the inclined cover 26.
- the protruding portion 71 protrudes within a range overlapping with the inclined portion 61 in plan view, that is, is formed on the inner side of the outer edge of the inclined cover 26 and does not protrude outward from the inclined cover 26.
- the protrusion 71 is formed on the opening 72, that is, is arranged so as to overlap the cold cathode tube 17, and here is arranged at a symmetrical position with respect to the central portion in the axial direction of the lamp holder 20.
- the protrusion 71 is formed so as to overlap with the cold cathode tube 17 as described above, it is difficult to cause a problem that the protrusion 71 is visually recognized as a shadow.
- the step from the first surface 20a to the second surface 20b is the same as the total thickness of the optical sheet 15, and is thereby placed on the second surface 20b.
- the gap between the liquid crystal panel 11 and the optical sheet 15 is substantially zero. That is, no other fixing member or the like is interposed between the liquid crystal panel 11 and the optical sheet 15, and the entire liquid crystal display device 10 is reduced in thickness.
- the optical member 15 is a member that changes the emission characteristics (for example, emission angle, in-plane luminance distribution, etc.) of the light emitted from the cold cathode tube 17, and as shown in FIG. 2, the diffusion plate 15a and the optical sheet group 15b. It consists of and.
- the optical sheet group 15b has a configuration in which a lens sheet 15c, diffusion sheets 15d, 15e, 15f, and 15g, and a reflective polarizing film 15h are laminated from the diffusion plate 15a side.
- the diffusion plate 15 a has a function of diffusing linear light emitted from the cold cathode tube 17, which is a linear light source, in which light scattering particles are dispersed and blended with a synthetic resin plate-like member. .
- the short side edge portion of the diffusion plate 15a is placed on the first surface 20a of the lamp holder 20, and is not subjected to vertical restraining force.
- the long side edge portion of the diffusion plate 15a is fixed by being sandwiched between the chassis 14 (reflection sheet 23) and the frame 16, as shown in FIG.
- a linear prism is formed in parallel on the surface (light emitting surface) of the diffusion plate (prism diffusion plate) 15a so that the longitudinal direction of the cold cathode tube 17 and the longitudinal direction of the prism are parallel to each other. Has been placed.
- the optical sheet group 15b other than the diffusing plate 15a among the optical members 15 is sandwiched between the diffusing plate 15a and the liquid crystal panel 11, and as described above, the lens sheet disposed on the light emitting side from the diffusing plate 15a.
- 15c, diffusion sheets 15d, 15e, 15f, 15g, and a reflective polarizing film 15h are laminated.
- the lens sheet 15c has a configuration in which linear convex lenses (convex cylindrical lens, lenticular lens) are formed in parallel on the surface (light emitting surface) of a translucent base material made of synthetic resin. The longitudinal direction of the lens and the longitudinal direction of the convex lens are arranged in parallel.
- the diffusion sheets 15d, 15e, 15f, and 15g have a configuration in which a diffusion layer in which light scattering particles are dispersed and mixed is bonded to the surface of a synthetic resin-made translucent substrate.
- the reflective polarizing film 15h is configured to transmit part of the light emitted from the diffusion sheets 15d, 15e, 15f, and 15g and reflect the other part, and to increase the light use efficiency for the pixels of the liquid crystal panel 11. have.
- a cold cathode is provided in a space (light source accommodation chamber) formed between the reflection sheet 23 arranged on the inner surface side of the chassis 14 and the diffusion plate 15a of the optical member 15. Tubes 17 are accommodated in parallel.
- the cold cathode tube 17 used in the present embodiment has a tube diameter of 4.0 mm, a distance between the cold cathode tube 17 and the reflection sheet 23 of 0.8 mm, a distance between adjacent cold cathode tubes 17 of 16.4 mm, The distance between the cold cathode tube 17 and the diffusion plate 15a is 2.7 mm.
- the backlight device 12 is thinned between the constituent members, and in particular, the distance between the cold cathode tube 17 and the diffusion plate 15a and the distance between the cold cathode tube 17 and the reflection sheet 23 are reduced. . Then, by reducing the thickness of the backlight device 12 as described above, the thickness of the liquid crystal display device 10 (that is, the thickness from the front surface of the liquid crystal panel 11 to the back surface of the backlight device 12) is 16 mm, and the thickness of the television receiver TV. That is, the thickness from the front surface cabinet Ca to the back surface of the back cabinet Cb is 34 mm, and a thin television receiver is realized.
- the lamp holder 20 is configured with a narrow width. Improvements in brightness and uneven brightness are realized. That is, in the lamp holder 20, since the projection 71 projecting toward the center of the cold cathode tube 17 is formed on the first surface 20a formed on the upper surface of the cover portion 20z, both the first surface 20a and the projection 71 are formed. Thus, the optical sheet 15 such as the diffusion plate 15a can be supported. Therefore, even when the mounting surface area of the first surface 20a is reduced, the diffusion plate 15a is supported by the protrusion 71 in an auxiliary manner. Is possible.
- the mounting surface area of the first surface 20a that is, the area of the cover portion 20z and hence the width of the lamp holder 20 as much as possible. It is. In this manner, the portion of the lamp holder 20 that covers the end of the cold cathode tube 17 can be narrowed while maintaining the support of the diffusion plate 15a, and as a result, the peripheral portion corresponding to the end of the cold cathode tube 17 can be reduced. Brightness increases and brightness unevenness is improved.
- the protrusion 71 since the protrusion 71 has the mounting surface 71a on the same plane as the first surface 20a, the optical sheet is suitably supported by the first surface 20a and the protrusion 71. ing. Furthermore, since the liquid crystal panel 11 is configured to be placed on the second surface 20b of the lamp holder 20, the distance between the backlight device 12 and the liquid crystal panel 11 is made as small as possible. Thinner. That is, in order to make the optical sheet 15 and the liquid crystal panel 11 as close as possible and to simplify the configuration, a configuration in which the liquid crystal panel 11 is placed on the lamp holder 20 is desirable.
- the second surface 20b for mounting the liquid crystal panel 11 is provided on the lamp holder 20, but the second surface 20b is simply attached to the light emitting side surface of the cover portion 20z. Then, the area of the first surface 20a on which the optical sheet 15 is placed is reduced by the area where the second surface 20b is formed, and the optical sheet 15 cannot be stably supported. Therefore, in the present embodiment, by forming the protrusion 71 together, the optical sheet 15 can be stably formed even when the lamp holder 20 is provided with the second surface 20b for mounting the liquid crystal panel in order to reduce the thickness. Thus, the contradictory effects of the stable support of the optical sheet 15 and the thinning of the liquid crystal display device 10 are suitably realized.
- the optical sheet 15 and the liquid crystal panel 11 are placed on the first surface 20a and the second surface 20b, respectively, and the step between the first surface 20a and the second surface 20b is optically determined. It was designed to be the same as the thickness of the sheet 15. As a result, the distance between the optical sheet 15 and the liquid crystal panel 11 can be made as small as possible, thereby realizing a thin liquid crystal display device 10.
- the lamp holder 20 is provided with an inclined cover 26, and the inclined surface of the inclined cover 26 realizes that light from the cold cathode tube 17 is directed to the liquid crystal panel 11 side.
- the protrusion 71 is formed on the inclined cover 26, and the protrusion 71 protrudes from the first surface 20 a within a range where the protrusion 71 overlaps the inclined cover 26. Thereby, in the illumination light, it is prevented that the projection-like shadow resulting from the protrusion part 71 arises.
- the protrusion 71 is formed on the opening 72, that is, arranged so as to overlap the cold cathode tube 17, but the protrusion 171 is opened as shown in FIG. It is also possible to form between the portions 72 and 72. If the protrusions 171 are formed between the openings 72 and 72, that is, between the cold cathode tubes 17 and 17, the problem that the protrusions 171 block the light from the cold cathode tubes 17 is less likely to occur. , Light utilization efficiency is high.
- the cold cathode tube 17 is used as the light source.
- the present invention is not limited to the cold cathode tube, and other discharge tubes such as a hot cathode tube can be used.
- the protrusion 71 is arranged at a symmetrical position with respect to the central portion of the lamp holder 20 in the axial direction. However, it may be asymmetrical and may be unevenly distributed on the center side. It can also be unevenly distributed on the end side. Further, the plurality of protrusions 71 provided on the lamp holder 20 may be formed at regular intervals.
Abstract
Description
近年、液晶表示装置(液晶テレビ)の薄型化、狭額縁化の要求は益々高くなっており、その一方でバックライト装置の全体輝度向上や輝度ムラ改善の要求も高くなっている。そこで、上記ランプホルダはバックライトを覆う部材であるため、周辺部の輝度上昇や輝度ムラ改善の観点から狭幅に構成し、可能な限りバックライトを覆う部分を少なくすることが好ましい。しかしながら、極端に狭幅に構成すると、拡散板等の光学シートを安定して支持することができないという不具合も生じ得る。
上記課題を解決するために、本発明の照明装置は、端部に導電部を備えた光源と、前記光源よりも光出射側に配された光学シートと、前記光源の端部を覆う遮光性のカバー部材と、を備え、前記カバー部材は、前記光源を覆うカバー部と、前記カバー部の光出射側の面に配され、前記光学シートを載置するための光学シート載置部とを有し、前記光学シート載置部には、前記光源の中央側に突出してなる突起部が具備されてなることを特徴とする。
このように光学シート載置部と突起部とが、互いに同一平面上の載置面をそれぞれ有してなるものとすれば、これら光学シート載置部と突起部とにより好適に光学シートを支持することが可能となる。
このように光照射対象物(例えば液晶パネル等)をカバー部材の光照射対象物載置部に載置すると、当該照明装置と光照射対象物との距離を可能な限り小さくすることが可能となり、ひいては照明装置と光照射対象物とによって構成される表示装置等の光学電子機器を薄型化することが可能となる。つまり、光源から光学シートを介して出射する照明光を光照射対象物に照射する場合に、光学シートと光照射対象物を可能な限り近づけ且つ構成を簡便化するためには、カバー部材に光照射対象物を載置する構成が望ましい。そこで、本発明のように光照射対象物載置部を付設するのであるが、単純に光照射対象物載置部をカバー部の光出射側の面に付設するのみでは、光照射対象物載置部を形成した面積だけ、光学シート載置部の面積が小さくなり、当該光学シートを安定して支持することができないものとなる。そこで、本発明のような突起部を併せて形成することで、薄型化を行うべくカバー部材に光照射対象物載置部を設けた場合にも安定して光学シートを支持でき、当該光学シートの安定支持と薄型化という相反する効果を好適に実現することが可能となるのである。
このような階段状面を形成し、その第1段面と第2段面にそれぞれ光学シートと光照射対象物を配するものとすれば、各段の高さを光学シートと光照射対象物の厚さと同じに設計することで、光学シートと光照射対象物との距離を可能な限り小さくすることができ、ひいては照明装置と光照射対象物とによって構成される表示装置等の光学電子機器を薄型化することが可能となる。
このようにカバー部材に傾斜部を設けた構成の場合、当該傾斜部の傾斜面により光源からの光を所定方向に指向させることが可能となり、更に突起部を傾斜部と重畳する範囲内でカバー部から突出してなる構成とすることで、当該突出部に起因する突起状の影の発生を防止ないし抑制することが可能となる。つまり、傾斜部と突起部とが重畳することで、突起部単独の影が発生することが防止ないし抑制されるのである。
この場合、カバー部材からの反射光を利用して、光照射対象物に照射する輝度を一層高めることができ、輝度ムラの発生も好適に抑制することが可能となる。
このような表示装置によると、光源の端部において輝度低下や輝度ムラが生じ難く、品質の優れた表示を実現することが可能となる。
前記表示パネルとしては液晶パネルを例示することができる。このような表示装置は液晶表示装置として、種々の用途、例えばテレビやパソコンのデスクトップ画面等に適用でき、特に超薄型のテレビ受信装置として好適である。
本発明によると、周辺部の輝度上昇や輝度ムラ改善に寄与することができるとともに、拡散板等の光学シートを安定して支持することができ、更には液晶表示装置(表示装置)の薄型化にも寄与することが可能な構成を備えた照明装置を提供することが可能となる。
図1は本実施形態のテレビ受信装置の概略構成を示す分解斜視図、図2は図1のテレビ受信装置が備える液晶表示装置の概略構成を示す分解斜視図、図3は図2の液晶表示装置の短辺方向に沿った断面構成を示す要部拡大断面図、図4は図2の液晶表示装置の長辺方向に沿った断面構成を示す要部拡大断面図である。また、図5は図2の液晶表示装置が備えるバックライト装置のランプホルダの表面側構成を示す斜視図、図6は同じくランプホルダの裏面側構成を示す斜視図、図7は同じくランプホルダの要部構成を拡大して示す斜視図である。
液晶パネル(表示パネル)11は、一対のガラス基板が所定のギャップを隔てた状態で貼り合わせられるとともに、両ガラス基板間に液晶が封入された構成とされる。一方のガラス基板には、互いに直交するソース配線とゲート配線とに接続されたスイッチング素子(例えばTFT)と、そのスイッチング素子に接続された画素電極、さらには配向膜等が設けられ、他方のガラス基板には、R(赤色),G(緑色),B(青色)等の各着色部が所定配列で配置されたカラーフィルタや対向電極、さらには配向膜等が設けられている。なお、両基板の外側には偏光板11a,11bが取り付けられている(図3及び図4参照)。
(1)上記実施形態では、突起部71を開口部72上に形成し、つまり冷陰極管17と重畳するように配するものとしたが、例えば図8に示すように、突起部171を開口部72,72間に形成することも可能である。このように開口部72,72間、つまり冷陰極管17,17間に突起部171を形成するものとすれば、当該突起部171が冷陰極管17からの光を遮る不具合が生じ難くなるため、光利用効率が高いものとなる。
(2)また、上記実施形態では光源として冷陰極管17を用いているが、冷陰極管に限らず熱陰極管等その他の放電管を用いることができる。
(3)また、上記実施形態では突起部71をランプホルダ20の軸線方向中央部分を基準として対称な位置に配しているが、非対称な配置であっても良く、また中央側に偏在させたり、端側に偏在させたりすることもできる。さらに、ランプホルダ20に設けた複数の突起部71は、それぞれが等間隔で形成されたものであっても良い。
Claims (9)
- 端部に導電部を備えた光源と、
前記光源よりも光出射側に配された光学シートと、
前記光源の端部を覆う遮光性のカバー部材と、を備え、
前記カバー部材は、前記光源を覆うカバー部と、前記カバー部の光出射側の面に配され、前記光学シートを載置するための光学シート載置部とを有し、
前記光学シート載置部には、前記光源の中央側に突出してなる突起部が具備されてなることを特徴とする照明装置。 - 前記突起部は、前記光学シート載置部の表面と同一平面上の載置面を有してなることを特徴とする請求の範囲第1項に記載の照明装置。
- 前記カバー部材は、前記カバー部の光出射側の面に配され、光照射対象物を載置するための光照射対象物載置部を更に有し、
前記光照射対象物載置部は、前記光学シート載置部よりも光出射側に形成されてなることを特徴とする請求の範囲第1項又は請求の範囲第2項に記載の照明装置。 - 前記カバー部は階段状面を有し、その階段状面のうち第1段面に前記光学シート載置部が配され、第2段面に前記光照射対象物載置部が配されていることを特徴とする請求の範囲第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。
- 前記光源が線状光源とされるとともに、前記線状光源を収容するシャーシを備え、
前記線状光源は、前記シャーシの内面に並列配置され、
前記カバー部材は、前記シャーシの端部に取り付けられた状態で前記線状光源の端部を覆ってなるとともに、前記カバー部から前記光源の中央側に張り出し且つ前記シャーシの底面に向けて傾斜する傾斜部を有し、
前記突起部は、前記傾斜部と重畳する範囲内で前記カバー部から突出してなることを特徴とする請求の範囲第1項から請求の範囲第4項のいずれか1項に記載の照明装置。 - 前記カバー部材の表面は光反射性を有してなることを特徴とする請求の範囲第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。
- 請求の範囲第1項から請求の範囲第6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、を備えることを特徴とする表示装置。 - 前記表示パネルが液晶を用いた液晶パネルであることを特徴とする請求の範囲第7項に記載の表示装置。
- 請求の範囲第7項又は請求の範囲第8項に記載の表示装置を備えることを特徴とするテレビ受信装置。
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WO2017002166A1 (ja) * | 2015-06-29 | 2017-01-05 | 堺ディスプレイプロダクト株式会社 | 表示装置 |
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CN103091899B (zh) * | 2011-11-03 | 2015-09-30 | 苏州璨宇光学有限公司 | 显示装置及其背光模组 |
WO2013103120A1 (ja) * | 2012-01-06 | 2013-07-11 | シャープ株式会社 | 表示装置及びテレビ受信装置 |
JP6441487B2 (ja) * | 2015-08-31 | 2018-12-19 | 堺ディスプレイプロダクト株式会社 | 表示装置 |
CN109239978B (zh) * | 2018-11-19 | 2021-06-15 | 海信视像科技股份有限公司 | 一种直下式显示装置 |
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RU2449211C1 (ru) | 2012-04-27 |
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