Display device

Abstract

To provide a display device capable of suppressing warpage of a display panel caused by heat generated from the display panel.SOLUTION: A display device comprises: a display panel which has a back surface and generates heat; a back cover which covers the back surface; a heat conduction part which is disposed between the back surface and the back cover, conducts the heat and includes a first portion and a second portion spaced apart from each other in a direction parallel to the back surface with a gap therebetween; and a connection part which connects the heat conduction part to the back cover.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a display device. [Background technology]

[0002] Patent Document 1 discloses an organic EL display device. In this organic EL display device, a display panel is held on the front side of a base, and a circuit board is held on the rear side of the base. One end of the wiring board is connected to the display panel, and the other end of the wiring board is connected to the circuit board. Electronic components are attached to at least one of the wiring board and the circuit board. A thermally conductive member is attached to the rear side of the electronic components and is sandwiched between the electronic components and a rear structural member. The thermally conductive member conducts heat generated by the electronic components to the rear structural member (paragraphs 0019, 0021, 0023, 0026, and 0027). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 198531 Summary of the Invention [Problem to be solved by the invention]

[0004] In a display device, when a heat conductive member attached to a display panel conducts heat generated by the display panel to a rear structural member, the heat conductive member may bend when thermally expanded, which may cause the display panel to bend.

[0005] In view of this problem, an aspect of the present disclosure provides a display device that can suppress bending of a display panel due to heat generated by the display panel, for example. [Means for solving the problem]

[0006] A display device according to one embodiment of the present disclosure comprises a display panel having a back surface and emitting heat, a back cover covering the back surface, a heat conduction portion disposed between the back surface and the back cover, conducting the heat, and comprising a first portion and a second portion separated from each other in a direction parallel to the back surface by a gap, and a connection portion connecting the heat conduction portion to the back cover. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view schematically illustrating a display device according to a first embodiment. [Figure 2] 1 is an exploded perspective view schematically illustrating a display device according to a first embodiment. [Figure 3] 1 is a cross-sectional view schematically illustrating a display device according to a first embodiment. [Figure 4] FIG. 2 is an enlarged cross-sectional view schematically illustrating a part of the display device of the first embodiment. [Figure 5] FIG. 1 is a cross-sectional view schematically illustrating a display device of a reference example. [Figure 6] FIG. 10 is an enlarged cross-sectional view schematically illustrating a part of a display device of a reference example. [Figure 7] FIG. 10 is an exploded perspective view schematically illustrating a display device according to a second embodiment. [Figure 8] FIG. 10 is a front view schematically illustrating a plurality of inner plates, a plurality of double-sided tapes, and a back cover provided in a display device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and redundant description will be omitted.

[0009] 1. First embodiment Fig. 1 is a perspective view that schematically illustrates a display device of a first embodiment. Fig. 2 is an exploded perspective view that schematically illustrates the display device of the first embodiment. Fig. 3 is a cross-sectional view that schematically illustrates the display device of the first embodiment.

[0010] A display device 1 according to the first embodiment shown in FIGS. 1 to 3 displays an image according to an input video signal.

[0011] As shown in FIGS. 1 to 3, the display device 1 includes a display panel 111, a plurality of panel tapes 112, a plurality of inner plates 113, a plurality of gap tapes 114, and a back cover 115.

[0012] The display panel 111 emits image light according to the input image signal to display an image.

[0013] The display panel 111 is a sheet-shaped organic light-emitting diode (OLED) display panel. Therefore, the display panel 111 has a front surface 111a and a back surface 111b. The display panel 111 displays an image on the front surface 111a. The display panel 111 is flexible. Therefore, the display panel 111 is prone to bending in a thickness direction D3 of the display panel 111. The display panel 111 may be a display panel other than a sheet-shaped OLED display panel. For example, the display panel 111 may be a plate-shaped liquid crystal display panel. However, the effect of the below-described technique for suppressing bending of the display panel 111 is more pronounced when the display panel 111 is an OLED display panel that is prone to bending in the thickness direction D3.

[0014] The display panel 111 has a rectangular shape when viewed from the front. The rectangular shape has a longitudinal direction D1 and a lateral direction D2. The longitudinal direction D1 and the lateral direction D2 are parallel to the front surface 111a and the back surface 111b of the display panel 111 and perpendicular to each other. The display panel 111 may have a shape other than a rectangular shape.

[0015] The display panel 111 generates heat when displaying an image. The amount of heat generated from a specific area of ​​the display panel 111 increases as the brightness of the image light emitted from the specific area increases.

[0016] Each panel tape 112 is a double-sided adhesive tape having adhesive surfaces 112a and 112b on opposite sides. The adhesive surface 112a is on the side where the display panel 111 is disposed and is attached to the back surface 111b of the display panel 111. The adhesive surface 112b is on the side where the multiple inner plates 113 are disposed and is attached to the front surface 113a of the multiple inner plates 113. In this way, the multiple panel tapes 112 connect the multiple inner plates 113 to the display panel 111. A connecting medium other than the multiple panel tapes 112 may connect the multiple inner plates 113 to the display panel 111. For example, multiple cured adhesives may connect the multiple inner plates 113 to the display panel 111.

[0017] The multiple panel tapes 112 are spaced apart from one another in the short-side direction D2 and arranged in the short-side direction D2. Each panel tape 112 extends in the longitudinal direction D1. The multiple panel tapes 112 may be arranged in a direction other than the short-side direction D2. Each panel tape 112 may extend in a direction other than the longitudinal direction D1.

[0018] The rear surface 111b of the display panel 111 and the front surfaces 113a of the inner plates 113 are separated from each other by a space having the same thickness as the panel tapes 112. The panel tapes 112 each have a thickness of only about 0.3 to 0.4 mm, for example. Therefore, the space has a thickness of only about 0.3 to 0.4 mm, for example. Therefore, heat generated by the display panel 111 is quickly transferred to the inner plates 113 via the space.

[0019] The inner plates 113 function as a heat conducting portion that conducts the transferred heat. Each inner plate 113 functions as a heat conducting member provided in the heat conducting portion.

[0020] Each inner plate 113 has a front surface 113a and a back surface 113b on opposite sides.

[0021] Each inner plate 113 is made of metal. The metal may be iron, aluminum, or the like. The inner plates 113 are joined to the display panel 111 via the panel tapes 112, and hold the panel tapes 112 and the display panel 111. The inner plates 113 have enough rigidity to hold the panel tapes 112 and the display panel 111. The display panel 111 held by the inner plates 113 is also flexible. Therefore, when the inner plates 113 deform, the display panel 111 held by the inner plates 113 also deforms in response to the deformation of the inner plates 113.

[0022] When heat is transferred to each inner plate 113, the inner plates 113 thermally expand. Each inner plate 113 has a thickness of, for example, only about 0.6 mm to 2.0 mm. Therefore, when thermal expansion in the planar direction is restricted, each inner plate 113 bends in the thickness direction D3 during thermal expansion.

[0023] The multiple inner plates 113 are parallel to the display panel 111. The distances from the multiple inner plates 113 to the display panel 111 are the same. The multiple inner plates 113 are spaced apart from each other in the longitudinal direction D1 and arranged in the longitudinal direction D1. The multiple inner plates 113 include multiple inner plate pairs, each consisting of adjacent inner plates. The first inner plate 131 and the second inner plate 132, which are adjacent to each other in the multiple inner plates 113 and make up each inner plate pair, respectively form a first portion and a second portion that are spaced apart from each other in the longitudinal direction D1 with a first gap 133 sandwiched therebetween. The first inner plate 131 and the second inner plate 132 are spaced apart from each other with the first gap 133 sandwiched therebetween, allowing thermal expansion in the planar direction. Therefore, the first inner plate 131 and the second inner plate 132 do not bend in the thickness direction D3 during thermal expansion. This makes it possible to prevent the display panel 111 from being warped in the thickness direction D3 together with the inner plates 113 due to heat generated by the display panel 111. The inner plates 113 may be arranged in a direction other than the longitudinal direction D1.

[0024] The first gap 133 narrows in the longitudinal direction D1 when the first inner plate 131 and the second inner plate 132 thermally expand.

[0025] Each inner plate 113 has a rectangular shape when viewed from the front. The first inner plate 131 and the second inner plate 132 each have a first side 131p and a second side 132p that face each other when viewed from the front. The first gap 133 is located between the first side 131p and the second side 132p and has a linear shape. The first side 131p, the second side 132p, and the first gap 133 extend in the short-side direction D2. Each inner plate 113 may have a shape other than a rectangular shape.

[0026] The multiple inner plates 113 include multiple inner plate pairs, each consisting of adjacent inner plates 113. Therefore, multiple first gaps 133 arranged in the longitudinal direction D1 are formed in the display device 1. Therefore, the first gap 133 between the first inner plate 131 and the second inner plate 132 is one of each of the multiple arranged gaps.

[0027] By arranging the multiple inner plates 113 in the longitudinal direction D1, they are spaced apart from each other in a direction in which a change in size due to thermal expansion is relatively large. This effectively suppresses deflection of the multiple inner plates 113 in the thickness direction D3. However, the multiple inner plates 113 may also be arranged in the transverse direction D2, or may be arranged in a matrix in the longitudinal direction D1 and the transverse direction D2. When the multiple inner plates 113 are arranged in the transverse direction D2, the multiple first gaps 133 are arranged in the transverse direction D2, and each first gap 133 extends in the longitudinal direction D1. When the multiple inner plates 113 are arranged in a matrix in the longitudinal direction D1 and the transverse direction D2, the multiple first gaps 133 include gaps extending in the longitudinal direction D1 and gaps extending in the transverse direction D2. These gaps as a whole have a lattice shape when viewed from the front.

[0028] Each gap tape 114 is a double-sided adhesive tape having adhesive surfaces 114a and 114b on opposite sides. The adhesive surfaces 114a of the plurality of gap tapes 114 are on the side where the plurality of inner plates 113 are arranged and are attached to the back surfaces 113b of the plurality of inner plates 113, respectively. The adhesive surfaces 114b are on the side where the back cover 115 is arranged and are attached to the front surface 115a of the back cover 115. As a result, the plurality of gap tapes 114 serve as connecting portions that connect the plurality of inner plates 113 to the back cover 115. A plurality of connecting media other than the plurality of gap tapes 114 may serve as the connecting portions. For example, a plurality of cured products of adhesives may serve as the connecting portions.

[0029] The multiple gap tapes 114 are spaced apart from one another in the longitudinal direction D1 and arranged in the longitudinal direction D1. Each gap tape 114 extends in the short direction D2. The multiple gap tapes 114 may be arranged in a direction other than the longitudinal direction D1. Each gap tape 114 may extend in a direction other than the short direction D2.

[0030] The rear surfaces 113b of the inner plates 113 and the front surface 115a of the back cover 115 are separated from each other by a space having the same thickness as the gap tapes 114. The gap tapes 114 have a thickness of only about 0.3 to 1.7 mm, for example. Therefore, the space has a thickness of only about 0.3 to 1.7 mm, for example. The thickness of the space sandwiched between the rear surfaces 113b of the inner plates 113 and the front surface 115a of the back cover 115 is greater than the thickness of the space sandwiched between the rear surface 111b of the display panel 111 and the front surfaces 113a of the inner plates 113.

[0031] The plurality of gap tapes 114 include a first double-sided tape 141 and a second double-sided tape 142 that respectively connect the first inner plate 131 and the second inner plate 132 to the back cover 115. The first double-sided tape 141 and the second double-sided tape 142 are respectively a first connecting member and a second connecting member that are separated from each other. The first double-sided tape 141 and the second double-sided tape 142 are separated from each other in the longitudinal direction D1 with a second gap 143 sandwiched therebetween.

[0032] The plurality of gap tapes 114 are arranged in positions in the longitudinal direction D1 that are different from the positions where the plurality of first gaps 133 are located. Each gap tape 114 is arranged in a position midway between the positions where adjacent first gaps 133 are located in the longitudinal direction D1.

[0033] The back cover 115 covers a rear surface 111b of the display panel 111. A plurality of panel tapes 112, a plurality of inner plates 113, and a plurality of gap tapes 114 are disposed between the rear surface 111b and a front surface 115a of the back cover 115.

[0034] FIG. 5 is a cross-sectional view that schematically illustrates a display device of a reference example.

[0035] A display device 9 of the reference example shown in FIG. 5 differs from the display device 1 of the first embodiment in that it includes one continuous inner plate 913 instead of the multiple inner plates 113 that are spaced apart from each other.

[0036] FIG. 6 is an enlarged cross-sectional view schematically illustrating a part of the display device of the reference example.

[0037] In the display device 9 of the reference example, as shown in FIG. 6 , there is no first gap 133 midway between the positions of adjacent second gap tapes 114 in the longitudinal direction D1. Therefore, when heat generated by the display panel 111 is transmitted to the inner plate 913, the inner plate 913 cannot thermally expand in the longitudinal direction D1, as shown by the dashed-dotted line, but instead bends in the thickness direction D3 and enters the relatively wide second gap 143. Furthermore, the display panel 111 bends in the thickness direction D3 together with the inner plate 913, as shown by the dashed-dotted line. This causes waviness on the front surface 111a of the display panel 111, where an image is displayed. This problem becomes particularly pronounced when the brightness of the image light generated by the display panel 111 is locally increased, the heat generated by the display panel 111 is locally increased, and the inner plate 913 thermally expands locally. The thermally expanding portion of the inner plate 913 is surrounded by a portion of the inner plate 913 that does not thermally expand.

[0038] FIG. 4 is an enlarged cross-sectional view schematically illustrating a part of the display device of the first embodiment.

[0039] In the display device 1 of the first embodiment, as shown in Fig. 4, the first gap 133 is located midway between the positions where adjacent second gap tapes 114 are disposed in the longitudinal direction D1. Therefore, when heat generated by the display panel 111 is transmitted to each inner plate 113, the inner plate 113 can thermally expand in the longitudinal direction D1 as shown by the dashed-dotted line, and does not bend in the thickness direction D3, so that the heat hardly penetrates into the second gap 143, which has a relatively wide width. Furthermore, the display panel 111 does not bend in the thickness direction D3. Therefore, no waviness occurs on the front surface 111a of the display panel 111 on which images are displayed.

[0040] 2. Second embodiment The following describes the differences between the second embodiment and the first embodiment. For points that are not described, the second embodiment also employs the same configuration as that employed in the first embodiment.

[0041] FIG. 7 is an exploded perspective view schematically illustrating a display device according to the second embodiment.

[0042] As shown in FIG. 7, the display device 2 of the second embodiment includes one inner plate 213 instead of the multiple inner plates 113.

[0043] The inner plate 213 serves as a heat conducting portion that conducts the transferred heat, and serves as a heat conducting member provided in the heat conducting portion.

[0044] A plurality of slits 213s are formed in the inner plate 213. The plurality of slits 213s are arranged in the longitudinal direction D1. Each slit 213s extends in the short-side direction D2. The plurality of slits 213s may be arranged in a direction other than the longitudinal direction D1. Each slit 213s may extend in a direction other than the short-side direction D2.

[0045] As shown in FIG. 7, each inner plate 113 includes a plurality of portions 251 separated from each other in the longitudinal direction D1 by a plurality of slits 213s.

[0046] The plurality of portions 251 include a first portion 261 and a second portion 262 spaced apart from each other in the longitudinal direction D1.

[0047] The first portion 261 and the second portion 262 are separated from each other in the longitudinal direction D1 by the slit 213 between the first portion 261 and the second portion 262. Therefore, the multiple slits 213s become multiple first gaps that have the same role as the multiple first gaps 133 formed in the display device 1 of the first embodiment.

[0048] In the display device 2 of the second embodiment, only one inner plate 213 is provided, which makes it easy to assemble the display device 2.

[0049] 3 Third embodiment The following describes the differences between the third embodiment and the first embodiment. For points that are not described, the third embodiment also employs the same configuration as that employed in the first embodiment.

[0050] FIG. 8 is a front view schematically illustrating a plurality of inner plates, a plurality of double-sided tapes, and a back cover provided in the display device of the third embodiment.

[0051] 8, in the third embodiment, the multiple inner plates 113 include an inner plate 371 having a non-annular shape when viewed from the front, and inner plates 372 and 373 having annular shapes. The inner plate 371 is disposed radially inward of the inner plate 372. The inner plate 372 is disposed radially inward of the inner plate 373.

[0052] The plurality of first gaps 133 include first gaps 381 and 382 each having an annular shape when viewed from the front. The first gap 381 is disposed radially inward of the first gap 382.

[0053] The plurality of gap tapes 114 includes gap tapes 391, 392, and 393 each having an annular shape when viewed from the front. Gap tape 391 is disposed radially inward of gap tape 392. Gap tape 392 is also disposed radially inward of gap tape 393.

[0054] The first inner plate 131 disposed on the radially inner side and the second inner plate 132 disposed on the radially outer side have an outer periphery 231p and an inner periphery 232q that face each other when viewed from the front. The pair of the first inner plate 131 disposed on the radially inner side and the second inner plate 132 disposed on the radially outer side includes a pair of inner plates 371 and 372, and a pair of inner plates 372 and 373.

[0055] The first inner plate 131 and the second inner plate 132 are radially separated from each other with a first gap 133 therebetween.

[0056] The inner plate 371 has an elliptical shape when viewed from the front. The inner plates 372 and 373 have an elliptical annular shape when viewed from the front. The inner plate 371 may have a shape other than an elliptical shape. For example, the inner plate 371 may have a circular shape, a polygonal shape, or the like. The inner plates 372 and 373 may have a shape other than an elliptical annular shape. For example, the inner plates 372 and 373 may have a circular annular shape, a polygonal annular shape, or the like.

[0057] The first gaps 381 and 382 have an elliptical ring shape when viewed from the front. The first gaps 381 and 382 may have a shape other than an elliptical ring shape. For example, the first gaps 381 and 382 may have a circular ring shape, a polygonal ring shape, or the like.

[0058] The gap tapes 391, 392, and 393 have an elliptical annular shape when viewed from the front. The gap tapes 391, 392, and 393 may have a shape other than an elliptical annular shape. For example, the gap tapes 391, 392, and 393 may have a circular annular shape, a polygonal annular shape, or the like.

[0059] The inner plates 371, 372, and 373, the first gaps 381 and 382, ​​and the gap tapes 391, 392, and 393 are concentrically arranged and have a common center. The inner plates 371, 372, and 373, the first gaps 381 and 382, ​​and the gap tapes 391, 392, and 393 do not have to be concentrically arranged or have a common center.

[0060] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0061] 129 display device, 111 display panel, 111a front surface, 111b rear surface, 112 double-sided tape, 112a, 112b adhesive surface, 113 inner plate, 113a front surface, 113b rear surface, 114 double-sided tape, 114a, 114b adhesive surface, 115 back cover, 115a front surface, 131 first inner plate, 131p first side, 132 second inner plate, 132p second side, 133 first gap, 141 first double-sided tape, 142 second double-sided tape, 143 second gap, 213 inner plate, 213s slit, 231p outer periphery, 232q inner periphery, 251 multiple parts, 261 first part, 262 second part, 371, 372, 373 inner plate, 381, 382 First gap, 391, 392, 393 double-sided tape, 913 inner plate, D1 longitudinal direction, D2 lateral direction, D3 thickness direction.

Claims

1. a display panel having a back surface and emitting heat; a back cover that covers the rear surface; a heat conduction portion disposed between the rear surface and the back cover, conducting the heat, and including a first portion and a second portion spaced apart from each other in a direction parallel to the rear surface with a gap therebetween; a connection portion that connects the heat conductive portion to the back cover; A display device comprising:

2. The first portion and the second portion are a first heat conducting member and a second heat conducting member, respectively, that are separated from each other. The display device according to claim 1 .

3. the first thermally conductive member has a first side; the second heat conducting member has a second side; The gap is between the first side and the second side and has a linear shape. The display device according to claim 2 .

4. the first thermally conductive member has an outer periphery; the second heat conducting member has an inner periphery; The gap is between the outer periphery and the inner periphery and has an annular shape. The display device according to claim 2 .

5. the heat conduction portion includes a heat conduction member including the first portion and the second portion, The gap is a slit formed in the heat conducting member. The display device according to claim 1 .

6. The display panel has a rectangular shape, The direction is parallel to the longitudinal direction of the rectangular shape.

6. The display device according to claim 1.

7. The display panel has a rectangular shape, The gap has a linear shape that is parallel to the short side direction of the rectangular shape.

6. The display device according to claim 1.

8. The display panel has a rectangular shape, The gap is one of a plurality of gaps arranged in the longitudinal direction of the rectangular shape.

6. The display device according to claim 1.

9. the gap is a first gap, The connecting portion includes a first connecting member and a second connecting member that connect the first portion and the second portion to the back cover, respectively, and are spaced apart in the direction with a second gap therebetween.

6. The display device according to claim 1.

10. The gap narrows in the direction when the first portion and the second portion thermally expand.

6. The display device according to claim 1.

Images