JP2007193238A - Light source device and display apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device and a display apparatus in which thermal expansion and contraction of an optical sheet can be absorbed by a bend of a flexible material and a gap where dust intrudes can be prevented by a bend of the flexible material. <P>SOLUTION: The light source device includes a light emitting lamp 1 disposed in the back of a display panel 7, an optical sheet 2 disposed between the light emission lamp 1 and the display panel 7, a box-like support 3 supporting the light emitting lamp 1 and the optical sheet 2, and an attachment frame 4 to attach a rim portion of the optical sheet 2 to an opening portion of the support 3, wherein the attachment frame 4 is composed of an annular plate 41 opposing to the surface on the rim portion of the optical sheet 2, and a cylindrical part 42 continuing from the outer rim of the annular plate 41. An annular groove 43 is provided on the inner face of the annular plate 41, and a flexible material 5 that pushes the rim portion of the optical sheet 2 to the support 3 is held in the annular groove 43, so as to absorb thermal expansion and contraction of the optical sheet 2 to prevent intrusion of dust. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light source device used as a light source of a display device such as a liquid crystal display device and a display device including the same.

  In a display device such as a television, a light source device is disposed on the back side of a display panel that displays an image.

  The light source device includes a plurality of fluorescent tubes arranged vertically apart from each other, a support that accommodates and supports each fluorescent tube, a reflection sheet that is accommodated in the support and reflects light emitted from the fluorescent tube, An optical sheet disposed between a fluorescent tube and a display panel and diffusing light reflected by the reflection sheet, a prism sheet, a diffusion sheet, a diffusion plate, and the like, and a peripheral portion of the optical sheet A mounting plate to be attached to the support (see, for example, Patent Document 1).

  FIG. 5 is a cross-sectional view showing a configuration in which a conventional light source device is incorporated in a display device. The support body 100 is provided with an annular plate portion 102 having a flat support surface along the optical sheet 101 at the open edge of the box portion forming a rectangular parallelepiped, and the peripheral edge portion of the optical sheet 101 is supported on the support surface. . The mounting plate 103 that attaches the peripheral edge of the optical sheet 101 to the support 100 has an L-shaped cross section, one piece is screwed to the outer peripheral side of the annular plate 102, and the other piece faces the peripheral edge of the optical sheet 101. The optical sheet 101 is attached to the annular plate portion 102 of the support 100.

  The optical sheet 101 is generally formed of a synthetic resin sheet, but a plurality of light-emitting lamps 104 are accommodated in a support body 100 that supports the optical sheet 101, and the optical sheet 101 is emitted by light emitted from the light-emitting lamps 104. Thermal expansion. Further, the optical sheet 101 contracts due to a temperature change caused by the flashing of the light-emitting lamp 104. Therefore, when the peripheral portion of the optical sheet 101 is pressed and fixed to the support body 100, the thermal expansion and contraction of the optical sheet 101 cannot be absorbed, and the optical sheet 101 is wrinkled. 105 appears as image unevenness on the display surface, so that a small gap is provided between the other piece of the mounting plate 103 and the peripheral portion of the optical sheet 101, and the thermal expansion and contraction of the optical sheet 101 are absorbed by the gap. The optical sheet 101 is configured to suppress wrinkles.

FIG. 6 is a cross-sectional view showing another configuration in which a conventional light source device is incorporated in a display device. The light source device includes an annular plate portion 106 that faces the peripheral surface of the optical sheet 101, and a mounting frame that is connected to the outer peripheral edge of the annular plate portion 106 and attached to the outer peripheral side of the annular plate portion 102. A small gap is provided between the annular plate portion 106 of the mounting frame 108 and the peripheral portion of the optical sheet 101, and the panel main body 109 and the peripheral portion of the panel main body 109 are sandwiched therebetween. An annular dustproof member 113 is provided on the back surface of the holding frame body 110 inside the display panel 112 having the held inner and outer holding frame bodies 110, 111, and the gap between the mounting frame body 108 and the display panel 112 is eliminated. Has been.
JP 2005-285714 A

  However, as shown in FIGS. 5 and 6, in the configuration in which a gap is provided between the mounting plate 103 or the mounting frame body 108 that attaches the optical sheet 101 to the support body 100 and the peripheral portion of the optical sheet 101, the support body Since dust outside 100 easily enters the space between the optical sheet 101 and the display panel 112 from the gap, the gap between the mounting plate 103 or the mounting frame 108 and the optical sheet 101 is managed with high accuracy, and the optical It is required to absorb the thermal expansion and contraction of the sheet 101 and to make it difficult for dust to enter, and an improvement measure has been demanded.

  The present invention has been made in view of such circumstances, and a main object of the present invention is to provide a flexible body that presses the peripheral edge of the optical sheet against the support, thereby suppressing thermal expansion and contraction of the optical sheet. It is an object of the present invention to provide a light source device and a display device that can absorb a gap by dust and prevent a gap from entering dust by bending of a flexible body.

  Another object of the present invention is to provide a light source device capable of improving the assembly workability in spite of the provision of a flexible body by providing a mounting frame that attaches the peripheral portion of the optical sheet to the support and providing the flexible body to the mounting frame. And providing a display device.

  Another object is to provide a light source device capable of easily providing a flexible body at a position corresponding to the form of the optical sheet by providing an annular groove in the mounting frame and holding the flexible body in the annular groove. It is to provide a display device.

  Another object is to provide a plurality of fitting projections on the inner peripheral portion of the mounting frame body, and to provide a fitting hole into which the fitting projection is inserted into the flexible body until the mounting frame body is attached. It is an object of the present invention to provide a light source device and a display device that can prevent a flexible body from falling off unexpectedly.

  Another object is to prevent dust from entering the space between the optical sheet and the display panel from between the mounting frame and the display panel by setting the flexible body to a thickness that should contact the back surface of the display panel. It is an object of the present invention to provide a light source device and a display device that can perform the above.

  Another object of the present invention is to provide a display device that can improve the assembly workability despite the provision of the flexible body by providing the flexible body on the back surface of the display panel.

  Another object is to provide a display device in which a flexible body can be easily provided at a position corresponding to the form of the optical sheet by providing an annular groove in the display panel and holding the flexible body in the annular groove. There is to do.

  In the light source device and the display device according to the present invention, the light source device includes a light-emitting lamp disposed on the back side of the display panel and a support that supports the light-emitting lamp and an optical sheet disposed between the light-emitting lamp and the display panel. A flexible body that presses the peripheral edge of the optical sheet against the support is provided.

  In this invention, since the flexible body presses the peripheral portion of the optical sheet and attaches it to the support, when the optical sheet thermally expands, the flexible body expands following this thermal expansion, and the thermal expansion is performed. When the optical sheet contracts, the flexible body can expand following the contraction and absorb the contraction. In addition, since the flexible body elastically presses the peripheral edge of the optical sheet, it is possible to eliminate a gap between the optical sheet mounting member and the optical sheet, and dust is generated in the space between the optical sheet and the display panel. Intrusion can be prevented.

  In addition, the light source device and the display device according to the present invention include an attachment frame body that attaches a peripheral portion of the optical sheet to the support body, and the flexible body is provided on the attachment frame body.

  In the present invention, since the flexible body can be incorporated by performing the operation of attaching the optical sheet, the assembly workability can be improved although the flexible body is provided.

  In the light source device and the display device according to the present invention, the mounting frame has an annular groove, and the flexible body is held in the annular groove.

  In this invention, since the flexible body can be reliably provided at an appropriate position, the flexible body can be easily provided at a position corresponding to the form of the optical sheet.

  Further, in the light source device and the display device according to the present invention, the mounting frame body has fitting protrusions at a plurality of circumferential positions on the inner peripheral portion, and the flexible body is fitted to which the fitting protrusion is inserted. It has a hole.

  In this invention, since the fitting protrusion is fitted in the fitting hole, it is possible to prevent the flexible body from falling off unexpectedly until the mounting frame is attached. It can be incorporated reliably.

  In the light source device and the display device according to the present invention, the flexible body has a thickness to be in contact with the back surface of the display panel.

  In the present invention, when the optical sheet is attached by the attachment frame body, the flexible body can be brought into contact with the back surface of the display panel, and therefore, between the optical sheet and the display panel from between the attachment frame body and the display panel. It is possible to prevent dust from entering the space.

  In the display device according to the present invention, the flexible body is provided on a back surface of the display panel.

  In the present invention, since the flexible body can be incorporated by performing the mounting operation of the display panel, the assembly workability can be improved although the flexible body is provided.

  In the display device according to the present invention, the display panel has an annular groove, and the flexible body is held in the annular groove.

  In this invention, since the flexible body can be reliably provided at an appropriate position, the flexible body can be easily provided at a position corresponding to the form of the optical sheet.

  As described above in detail, according to the present invention, when the optical sheet is thermally expanded, the flexible body can be extended following the thermal expansion to absorb the thermal expansion, and the optical sheet is contracted. Sometimes, following this contraction, the flexible body extends and can absorb the contraction. In addition, since the gap between the optical sheet mounting member and the optical sheet can be eliminated by an elastic body that absorbs thermal expansion, dust can enter the space between the optical sheet and the display panel without increasing the number of components. Can be prevented.

  In addition, according to the present invention, since the flexible body can be incorporated by performing the work of attaching the optical sheet, the assembly workability can be improved although the flexible body is provided.

  Moreover, according to this invention, since a flexible body can be reliably provided in an appropriate position, a flexible body can be simply provided in the position corresponding to the form of an optical sheet.

  In addition, according to the present invention, since the fitting protrusion is fitted into the fitting hole, it is possible to prevent the flexible body from unexpectedly dropping before the mounting frame is attached. Can be reliably incorporated.

  In addition, according to the present invention, when the optical sheet is attached by the attachment frame body, the flexible body can be brought into contact with the back surface of the display panel, so that between the optical sheet and the display panel from between the attachment frame body and the display panel. It is possible to prevent dust from entering the space.

  In addition, according to the present invention, since the flexible body can be incorporated by performing the mounting operation of the display panel, the assembly workability can be improved although the flexible body is provided.

  Moreover, according to this invention, since a flexible body can be reliably provided in an appropriate position, a flexible body can be simply provided in the position corresponding to the form of an optical sheet.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
Embodiment 1
FIG. 1 is a cross-sectional view showing a configuration in which a light source device according to the present invention is incorporated in a display device. The illustrated light source device includes a cylindrical light emitting lamp 1 in which a plurality of light sources are juxtaposed, and a box-shaped support body that accommodates and supports the light emitting lamp 1 and supports a peripheral portion of an optical sheet 2 such as a diffusion plate. 3, a mounting frame 4 that attaches the peripheral edge of the optical sheet 2 to the support 3, a flexible body 5 that presses the peripheral edge of the optical sheet 2 against the support 3, and a light emission accommodated in the support 3. And a reflection sheet 6 that reflects the light emitted from the lamp 1 toward the open side of the support 3.

  The light-emitting lamp 1 is a cold cathode tube having electrodes at both ends, and both ends are held by concave holding portions provided side by side in the support 3.

  The support body 3 includes an aluminum frame member 31 having a rectangular parallelepiped shape, and an aluminum lid plate 32 having a peripheral edge portion coupled to the frame member 31 and closing the back side end of the frame member 31. An annular plate portion 33 having a support surface 33a that supports the peripheral edge of the optical sheet 2 at the end, and an annular upright portion 34 that rises forward from the outer peripheral portion of the annular plate portion 33 and into which the mounting frame 4 is fitted. And are provided. The cover plate 32 has a plate portion having a size corresponding to the frame member 31 and a cylindrical flange connected to the outer edge of the plate portion, and the flange is detachably coupled to the frame member 31.

  The mounting frame 4 has a rectangular parallelepiped shape having an annular plate portion 41 facing the peripheral surface of the optical sheet 2 and a cylindrical portion 42 that is continuous with the outer peripheral edge of the annular plate portion 41 and is fitted on the upright portion 34. An annular groove 43 is provided on the inner surface of the annular plate portion 41. The mounting frame 4 is made of aluminum or synthetic resin and is integrally formed.

  The flexible body 5 has a flat portion 51 that contacts the peripheral surface of the optical sheet 2 and a convex portion 52 that is continuous with the flat portion 51 and is fitted into the annular groove 43. It is formed in a rectangular ring by a flexible material such as resin, and is held by the mounting frame 4 by fitting the protruding portion 52 into the annular groove 43.

  The optical sheet 2 includes a reflective polarizing plate 21, a prism sheet 22, a diffusion sheet 23, a diffusion plate 24, and the like, and has a rectangular parallelepiped size corresponding to the display panel 7.

  In the light source device configured as described above, the reflection sheet 6 and the light-emitting lamp 1 are assembled in the support 3 placed on the work table so that the open edge faces upward, and then the diffusion plate of the optical sheet 2 24, the diffusion sheet 23, the prism sheet 22, and the reflective polarizing plate 21 are sequentially placed on and supported by the support surface 33a of the support 3. Next, the cylindrical portion 42 of the mounting frame body 4 in which the flexible body 5 is held in the annular groove 43 of the annular plate portion 41 is externally fitted to the upright portion 34 of the support body 3, and the mounting frame body 4 is attached to the support body 3. At the same time, the flat portion 51 of the flexible body 5 is brought into contact with the peripheral surface of the reflective polarizing plate 21, and the optical sheet 2 is pressed against the support surface 33 a while slightly bending the flexible body 5.

  In the light source device assembled in this way, the flexible body 5 is bent by the attachment of the attachment frame body 4, and the flexible body 5 presses the optical sheet 2 against the support surface 33a, so that the optical sheet 2 is thermally expanded. At this time, the flat portion 51 of the flexible body 5 is extended following the extension of the optical sheet 2 due to the thermal expansion, and the thermal expansion of the optical sheet 2 can be absorbed. Further, when the optical sheet 2 contracts due to a temperature change caused by the flashing of the light-emitting lamp 1, the flat portion 51 of the flexible body 5 expands following the contraction, and the contraction of the optical sheet 2 can be absorbed. it can. In addition, since the flexible body 5 represses the optical sheet 2, the gap between the optical sheet 2 and the mounting frame body 4 can be eliminated, and dust can enter the space between the optical sheet 2 and the display panel 7 from this gap. Can be prevented from entering. In addition, since the flexible body 5 is held by the mounting frame body 4, the work of assembling the flexible body 5 is not necessary, and the optical sheet 2 is thermally expanded and contracted by the work of attaching the optical sheet 2 by the mounting frame body 4. Absorption of dust and prevention of dust intrusion can be achieved.

Embodiment 2
FIG. 2 is a cross-sectional view showing another configuration in which the light source device according to the present invention is incorporated in a display device, and FIG. 3 is an exploded perspective view of the main part. In this light source device, a plurality of fitting projections 44 are provided on the inner peripheral portion of the annular plate portion 41 of the mounting frame 4, and a plurality of fitting holes 53 into which the fitting projections 44 are fitted are provided in the flexible body 5. It is a thing.

  The fitting protrusions 44 are integrally projected at a plurality of circumferential positions of the annular plate portion 41. The flexible body 5 has an annular cylindrical shape, and fitting holes 53 penetrating the inner and outer peripheral surfaces are provided at a plurality of circumferential positions. The cylindrical flexible body 5 has a thickness between both ends that should be in contact with the back surface of the display panel 7.

In the second embodiment, the flexible body 5 is held on the attachment frame body 4 by fitting the fitting protrusions 44 into the fitting holes 53. Therefore, the cylindrical portion 42 of the mounting frame 4 is fitted on the upright portion 34 of the support 3, and the mounting frame 4 is mounted on the support 3, so that one end of the flexible body 5 is connected to the peripheral edge of the reflective polarizing plate 21. The optical sheet 2 can be attached by pressing the optical sheet 2 against the support surface 33a while making contact with the surface and slightly bending the flexible body 5.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

The light source device configured as described above is used as a light source of a display device such as a liquid crystal display device as shown in FIGS.
The display device includes a display panel 7 for displaying a television image, a light source device disposed on the back side of the display panel 7, an optical sheet 2 disposed between the light-emitting lamp 1 of the light source device and the display panel 7, This is a liquid crystal television including a front cabinet having a rectangular shape surrounding the peripheral edge of the display panel 7 and a back cabinet covering the light source device, in other words, a liquid crystal display device.

  The display panel 7 includes a panel main body 71 having an image display surface on the front side and forming a rectangular parallelepiped, and inner and outer holding frame bodies 72 and 73 that form a quadrangle that is held across the peripheral edge of the panel main body 71. The holding frame bodies 72 and 73 are attached to the support body 3 with bolts.

  In the display device configured as described above, after the optical sheet 2 is incorporated in the light source device, the display panel 7 is placed on the optical sheet 2 and the holding frames 72 and 73 of the display panel 7 are supported by a plurality of bolts. Attach to the body 3 and attach the stand, front cabinet, back cabinet, etc.

  In the display device shown in FIG. 1, the back surface of the inner holding frame body 72 is in contact with the outer surface of the annular plate portion 41 of the mounting frame body 4 to eliminate the gap between the mounting frame body 4 and the display panel 7.

  In the display device shown in FIG. 2, the back surface of the inner holding frame 72 is in contact with the other end of the flexible body 5, and the other end of the flexible body 5 is slightly bent. The gap between the display panels 7 is eliminated.

  FIG. 4 is a cross-sectional view showing another configuration in which the light source device according to the present invention is incorporated in a display device. In this display device, a holding member 8 having an annular groove 81 is provided on the back side of an inner holding frame body 72, and a flexible body 5 having a flat portion 51 and a convex portion 52 is inserted into the annular groove 81 of the holding member 8. It is held.

  In this embodiment, since the flexible body 5 is held by the display panel 7, the flat portion 51 of the flexible body 5 is mounted by attaching the display panel 7 to the support 3 of the optical sheet 2. The optical sheet 2 can be attached by contacting the peripheral surface of the reflective polarizing plate 21 and pressing the optical sheet 2 against the support surface 33a while slightly bending the flexible body 5. Therefore, the gap between the optical sheet 2 and the display panel 7 can be eliminated.

  In the embodiment described above, the flexible body 5 is formed in an annular shape. However, the flexible body 5 is formed in, for example, a belt shape and fitted into the annular groove 43 or 81 so as to be endless. Also good.

  In the embodiment described above, the annular grooves 43 and 81 are provided and the flexible body 5 is fitted and held in the annular grooves 43 and 81. However, the annular grooves 43 and 81 are eliminated, and vulcanization adhesion is performed. You may hold | maintain by. In addition to the flexible body 5 formed into an annular shape or a belt shape, for example, a sealing material such as a sealant is injected into the annular grooves 43 and 81 to form a flexible body, or the aforementioned sealing material is applied to the flat portion. The flexible body 5 may be formed by adhering to form a flexible body or by vulcanization molding.

It is sectional drawing which shows the structure by which the light source device which concerns on this invention was integrated in the display apparatus. It is sectional drawing which shows the other structure by which the light source device which concerns on this invention was integrated in the display apparatus. It is a disassembled perspective view of the principal part of the light source device which concerns on this invention. It is sectional drawing which shows the other structure by which the light source device which concerns on this invention was integrated in the display apparatus. It is sectional drawing which shows the structure by which the conventional light source device was integrated in the display apparatus. It is sectional drawing which shows the other structure by which the conventional light source device was integrated in the display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light-emitting lamp 2 Optical sheet 3 Support body 4 Mounting frame 43 Annular groove 44 Fitting protrusion 5 Flexible body 53 Fitting hole 7 Display panel 81 Annular groove

Claims (8)

  In a light source device including a light-emitting lamp disposed on the back side of a display panel and a support that supports the light-emitting lamp and the optical sheet disposed between the display panel, a peripheral portion of the optical sheet is used as the support. A light source device comprising a flexible body to be pressed.   The light source device according to claim 1, further comprising an attachment frame that attaches a peripheral edge of the optical sheet to the support, and the flexible body is provided on the attachment frame.   The light source device according to claim 2, wherein the mounting frame has an annular groove, and the flexible body is held in the annular groove.   The light source device according to claim 2, wherein the mounting frame has fitting protrusions at a plurality of circumferential positions of an inner peripheral portion, and the flexible body has fitting holes into which the fitting protrusions are inserted.   The light source device according to claim 4, wherein the flexible body has a thickness to be in contact with a back surface of the display panel.   A display device comprising: a display panel; and the light source device according to any one of claims 1 to 5 disposed on a back side of the display panel.   The display device according to claim 6, wherein the flexible body is provided on a back surface of the display panel.   The display device according to claim 6, wherein the display panel has an annular groove, and the flexible body is held in the annular groove.

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