Image display device

Abstract

An image display device (100) includes a metal frame (10) having an opening (10a) formed in an upper wall (11a) and accommodating a light source that radiates light toward the opening (10a), a liquid crystal display portion (20) disposed at a position that closes the opening (10a) and radiates the light from the light source as display light (L) of an image, a glass plate (60) disposed between the opening of the frame and the liquid crystal display portion, in contact with the liquid crystal display portion, and allowing the light from the light source to pass toward the liquid crystal display portion, and a heat conducting sheet (80) disposed between a rim portion of the opening in the frame and a rim portion of the glass plate, receiving heat of the liquid crystal display portion via the glass plate, and transferring the heat to the frame.

Description

Technical Field

[0001] This invention relates to an image display device. Background Technology

[0002] For example, Patent Document 1 discloses a structure comprising a head-up display device including a backlight, a liquid crystal panel, and a rear light-transmitting plate. In this display, the rear light-transmitting plate is a transparent glass plate disposed against the back side of the liquid crystal panel, and one side is roughened by wet sandblasting. In this rear light-transmitting plate, the roughened surface serves as the panel-facing surface and is disposed in an overlapping manner with the liquid crystal panel. Furthermore, the surface roughness of the panel-facing surface is set to a value sufficiently fine relative to the size of the liquid crystal panel and the field of view capable of displaying virtual images. In Patent Document 1, the above structure improves the heat dissipation of the display and suppresses the generation of interference fringes.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-66232 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] However, in image display devices such as head-up displays, it is desirable to improve heat dissipation and vibration resistance.

[0008] The purpose of this invention is to provide an image display device that can improve heat dissipation and vibration resistance.

[0009] Technical means for solving problems

[0010] The image display device of the present invention comprises: a metal frame having an opening formed in its upper wall and housing a light source that irradiates light toward the opening; a liquid crystal display unit disposed at a position that closes the opening and emits light from the light source as display light for an image; a glass plate disposed between the opening of the frame and the liquid crystal display unit, in contact with the liquid crystal display unit, and allowing light from the light source to pass through to the liquid crystal display unit; and a heat-conducting sheet disposed between the edge of the opening in the frame and the edge of the glass plate, receiving heat from the liquid crystal display unit via the glass plate and transferring the heat to the frame.

[0011] Invention Effects

[0012] The image display device of the present invention can improve heat dissipation and vibration resistance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating a vehicle display device that includes an image display apparatus according to an embodiment.

[0014] Figure 2 This is a perspective view of an image display device according to an embodiment.

[0015] Figure 3 This is an exploded perspective view illustrating an embodiment of an image display device.

[0016] Figure 4 This is a top view of the frame of the image display device in an embodiment.

[0017] Figure 5 This is a top view of the image display device illustrating an embodiment.

[0018] Figure 6 This is a top view of the image display device illustrating an embodiment.

[0019] Figure 7 This is a top view of the image display device illustrating an embodiment.

[0020] Figure 8 This is a perspective view of an image display device according to an embodiment.

[0021] Figure 9 This is a cross-sectional view illustrating an embodiment of an image display device.

[0022] Figure 10 This is an enlarged cross-sectional view illustrating an embodiment of the image display device.

[0023] Figure 11 This is an enlarged cross-sectional view illustrating an embodiment of the image display device.

[0024] Figure 12 This is a cross-sectional view illustrating an embodiment of an image display device.

[0025] Figure 13 This is an enlarged cross-sectional view illustrating an embodiment of the image display device.

[0026] Figure 14 This is an enlarged cross-sectional view illustrating an embodiment of the image display device.

[0027] Figure 15 This is an enlarged cross-sectional view illustrating an embodiment of the image display device.

[0028] Explanation of reference numerals in the attached figures

[0029] 10: Frame

[0030] 20: LCD Display Unit

[0031] 30: Border section

[0032] 40: Flexible Printed Substrate Section

[0033] 41: Display Control Unit

[0034] 42: Wiring section

[0035] 50: Elastic component

[0036] 51: First elastic component

[0037] 52: Second elastic component

[0038] 60: Glass plate

[0039] 70: Diffuser plate

[0040] 80: Thermal conductive sheet

[0041] 81: First heat-conducting plate

[0042] 82: Second heat-conducting plate

[0043] 100: Image display device

[0044] 200: Vehicle display device

[0045] 300: Vehicles Detailed Implementation

[0046] Hereinafter, an image display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to this embodiment. Furthermore, the constituent elements in the following embodiments include elements readily conceived by those skilled in the art or substantially the same elements.

[0047] [Example]

[0048] Reference Figures 1 to 15 The embodiments are described below. Figure 1 This is a schematic diagram illustrating a vehicle display device including an image display apparatus according to an embodiment. Figure 2 This is a perspective view illustrating an embodiment of an image display device. Figure 3 This is an exploded perspective view illustrating an embodiment of the image display device. Figure 4 This is a top view of the frame of the image display device illustrating an embodiment. Figure 5 This is a top view illustrating an embodiment of the image display device. Figure 6 This is a top view illustrating an embodiment of the image display device. Figure 7 This is a top view illustrating an embodiment of the image display device. Figure 8 This is a perspective view illustrating an embodiment of an image display device. Figure 9 This is a cross-sectional view illustrating an embodiment of an image display device. Figure 10This is an enlarged cross-sectional view illustrating an embodiment of the image display device. Figure 11 This is an enlarged cross-sectional view illustrating an embodiment of the image display device. Figure 12 This is a cross-sectional view illustrating an embodiment of an image display device. Figure 13 This is an enlarged cross-sectional view illustrating an embodiment of the image display device. Figure 14 This is an enlarged cross-sectional view illustrating an embodiment of the image display device. Figure 15 This is an enlarged cross-sectional view illustrating an embodiment of the image display device.

[0049] In addition, Figure 5 For ease of explanation, the liquid crystal display unit, flexible printed circuit board unit, glass plate, elastic components, and frame unit have been omitted. Additionally, in Figure 6 For ease of explanation, the liquid crystal display section, flexible printed circuit board section, elastic component, and bezel section have been omitted. Additionally, in Figure 7 as well as Figure 8 For ease of explanation, the elastic components and border sections have been omitted. Additionally... Figure 9 yes Figure 2 A cross-sectional view of line AA in the middle. Figure 10 yes Figure 9 An enlarged sectional view of region A1 shown. Figure 11 yes Figure 9 An enlarged cross-sectional view of region A2 shown. Additionally, Figure 12 yes Figure 2 A cross-sectional view at line BB in the middle. Figure 13 yes Figure 12 An enlarged sectional view of region C in the diagram. Figure 14 yes Figure 2 An enlarged sectional view of the glass plate perimeter at the CC line. Figure 15 yes Figure 2 An enlarged sectional view of the glass plate perimeter at the DD line.

[0050] like Figure 1 As shown, the image display device 100 of this embodiment is a display device that emits display light L to emit an image, and is suitable for use in a vehicle display device 200 mounted on a vehicle 300 such as an automobile. The vehicle display device 200 of this embodiment is a head-up display device.

[0051] A vehicle display device 200 is disposed inside the dashboard of a vehicle 300, emitting display light L toward the reflective surface of a display component 301 in the vehicle 300. In this embodiment, the display component 301 is a windshield. In this embodiment, the display component 301 is disposed in front of the driver of the vehicle 300. A semi-transparent coating or similar material may also be provided on the reflective surface of the display component 301, which reflects a portion of the incident light while allowing another portion to pass through. The display light L emitted toward the reflective surface of the display component 301 is reflected from the reflective surface to the eye point EP of the vehicle 300, thereby being perceived as a virtual image by the driver.

[0052] The vehicle display device 200 is configured to include the image display device 100 of the embodiment. In the embodiment, in addition to the image display device 100, the vehicle display device 200 also includes a housing 201, a first reflective member 202, and a second reflective member 203.

[0053] The housing 201 internally houses and supports the first reflective component 202, the second reflective component 203, and the image display device 100. The housing 201 has an opening 201a that communicates between the inside and outside of the housing 201. The opening 201a is positioned within the housing 201 opposite to the display component 301. The vehicle display device 200 emits display light L from the housing 201 through the opening 201a toward the display component 301. The display light L is light emitted from the image display device 100 and reflected by the first reflective component 202 and the second reflective component 203.

[0054] The first reflective component 202 and the second reflective component 203 are disposed in the optical path from the image display device 100 to the display component 301, forming an optical system that reflects the display light L emitted from the image display device 100 toward the display component 301. The reflective surface of the first reflective component 202 is formed of a plane and is disposed at a position opposite to the image display device 100. The first reflective component 202 reflects the display light L emitted from the image display device 100 toward the second reflective component 203. The reflective surface of the second reflective component 203 is formed of a concave curved surface and is disposed at a position opposite to the first reflective component 202. The second reflective component 203 reflects the display light L reflected by the first reflective component 202 toward the display component 301 via the opening 201a. In an embodiment, the second reflective component 203 functions as a magnifying glass. That is, the second reflective component 203 magnifies and reflects the display image in such a way that the display image represented by the display light L after reflection by the second reflective component 203 is larger than the display image represented by the display light L before reflection by the second reflective component 203.

[0055] Figure 2 The image display device 100 shown emits the display image projected onto the display unit 301 as display light L. For example... Figure 3 As shown, the image display device 100 of the embodiment includes a frame 10, a liquid crystal display unit 20, a bezel unit 30, a flexible printed circuit board unit 40, an elastic member 50, a glass plate 60, a diffuser plate 70, and a heat-conducting sheet 80.

[0056] The frame 10 is a box-shaped component that houses a light source (not shown). The light source is, for example, an LED (Light Emitting Diode) mounted on a substrate. In this embodiment, the frame 10 is made of metal. The frame 10 is formed, for example, of a metal material with high thermal conductivity, such as aluminum. In this embodiment, the frame 10 consists of an upper frame 11 and a lower frame 12.

[0057] The upper frame 11 includes a rectangular plate-shaped upper wall 11a and side walls 11b hanging down from each side of the upper wall 11a, forming a box shape with an opening at the bottom. The lower frame 12 includes a rectangular plate-shaped bottom wall 12a and side walls 12b erected at each side of the bottom wall 12a, forming a box shape with an opening at the top.

[0058] The frame 10 is assembled into a box shape by aligning the opening at the bottom of the upper frame 11 with the opening at the top of the lower frame 12, and is fixed by screws or other fasteners. In this embodiment, the sidewall 11b of the upper frame 11 is composed of a first sidewall 11b1, a second sidewall 11b2, a third sidewall 11b3, and a fourth sidewall 11b4. In the upper frame 11, the first sidewall 11b1 and the second sidewall 11b2 are opposite each other in a front-back direction orthogonal to the vertical direction, which is the direction from the upper frame 11 towards the lower frame 12. Furthermore, in the upper frame 11, the third sidewall 11b3 and the fourth sidewall 11b4 are opposite each other in a width direction orthogonal to both the vertical and front-back directions.

[0059] The upper wall 11a is arranged to slope downwards from the first side wall 11b1 to the second side wall 11b2. The upper ends of the third side wall 11b3 and the fourth side wall 11b4 slope downwards from the first side wall 11b1 to the second side wall 11b2, respectively, along the upper wall 11a. Here, "lower side" in the vertical direction refers to the lower frame 12 side relative to the upper frame 11, and "upper side" in the vertical direction refers to the upper frame 11 side relative to the lower frame 12.

[0060] In this embodiment, the lower ends of the first sidewall 11b1, the second sidewall 11b2, the third sidewall 11b3, and the fourth sidewall 11b4 are substantially at the same position in the vertical direction. Therefore, the length of the first sidewall 11b1 in the vertical direction is longer than the length of the second sidewall 11b2 in the vertical direction. Furthermore, the upper ends of the four sidewalls of the lower frame 12 are substantially at the same position in the vertical direction.

[0061] An opening 10a is formed in the upper wall 11a of the frame 10. In this embodiment, the opening 10a is rectangular with the short side in the front-to-back direction and the long side in the width direction. The light source housed in the frame 10 is configured to illuminate the opening 10a.

[0062] like Figure 3 As shown, a heat dissipation component 12A is formed on the bottom wall 12a of the frame 10. The heat dissipation component 12A protrudes from the bottom wall 12a of the lower frame 12 toward the side opposite to the side of the upper frame 11 (i.e., the lower side). In this embodiment, the heat dissipation component 12A is composed of a plurality of plate-like portions protruding downward from the bottom wall 12a of the lower frame 12, and functions as a heat sink.

[0063] Additionally, a housing 201 for fixing the image display device 100 to the vehicle display device 200 is formed in the lower frame 12 (see reference). Figure 1 The flange portion 12B is formed on both sides of the lower frame 12 in the width direction. In this embodiment, the flange portion 12B is formed as a plate-shaped portion protruding from the side wall of the lower frame 12 in the width direction. Each flange portion 12B has a through hole for fastening components such as bolts to be inserted.

[0064] like Figure 4 As shown, a groove 11c is formed at the edge of the opening 10a in the upper wall 11a of the frame 10. Here, the "edge of the opening 10a" is the portion of the upper wall 11a surrounding the hole that surrounds the opening 10a. The groove 11c is formed in a shape that is recessed downward relative to the surface surrounding the edge of the opening 10a. Figure 5 As shown, a heat-conducting sheet 80 is placed inside the groove 11c. In this embodiment, the groove 11c includes a first groove 11c1 and a second groove 11c2. The first groove 11c1 and the second groove 11c2 are formed at positions that sandwich the opening 10a in the front-back direction (the direction of the short side of the opening 10a). The first groove 11c1 is located on the side of the first sidewall 11b1 relative to the opening 10a. The second groove 11c2 is located on the side of the second sidewall 11b2 relative to the opening 10a. The first groove 11c1 and the second groove 11c2 are formed as rectangular grooves extending along the width direction (the length direction of the opening 10a).

[0065] like Figure 3As shown, the liquid crystal display unit 20 is a so-called liquid crystal panel, such as a TFT liquid crystal (Thin Film Transistor Liquid Crystal Display) of the light-transmitting or light-semi-transmitting type. The liquid crystal display unit 20 is illuminated by a light source from the back side, thereby emitting light from the display surface on the surface side. Through this structure, the liquid crystal display unit 20 emits light from the light source as the display light L of the image from the display surface. Here, the light source is, for example, from the vehicle 300 (see reference 300). Figure 1 The liquid crystal display unit 20 is powered by electricity obtained from a battery or other internal source. In this embodiment, the liquid crystal display unit 20 is formed as a rectangular plate slightly larger than the opening 10a of the frame 10, and is positioned to close the opening 10a.

[0066] The bezel portion 30 is disposed on the upper side of the upper wall 11a in the frame 10. The bezel portion 30 has an opening 30a that is rectangular when viewed from above. The opening 30a of the bezel portion 30 allows the display light L from the liquid crystal display unit 20 to pass toward the first reflective member 202 (see reference). Figure 1 The portion through which the liquid crystal display unit 20 passes. In this embodiment, the frame portion 30 is formed in the shape of a frame along the edge of the opening 10a of the frame 10. The frame portion 30 is fixed to the frame 10 in a state where the liquid crystal display unit 20 is sandwiched between the frame portion 30 and the edge of the opening 10a of the frame 10.

[0067] In an embodiment, such as Figure 2 As shown, protrusions 11A protruding outward are formed on the third sidewall 11b3 and the fourth sidewall 11b4 of the upper frame 11, and locking portions 31 that engage with the protrusions 11A are formed on the frame portion 30. The locking portions 31 are provided as multiple frame-shaped parts, each protruding from the outer periphery of the frame portion 30 toward the frame 10, and are arranged in a one-to-one correspondence with the protrusions 11A. The frame portion 30 is mounted to the frame 10 from the upper side in the vertical direction. When the frame portion 30 is mounted to the frame 10, the locking portions 31 pass over the protrusions 11A, embedding the protrusions 11A into the frame of the locking portion 31, thereby locking the frame portion 30 to the frame 10.

[0068] The flexible printed circuit board portion 40 is configured to include a display control portion 41 and a flexible, film-like wiring portion 42. In this embodiment, the display control portion 41 is, for example, a rectangular plate-shaped component made of an IC chip or the like, disposed on the surface of the wiring portion 42 and electrically connected to it. In this embodiment, one end of the flexible printed circuit board portion 40 (one end of the wiring portion 42) is connected to one of the four sides of the liquid crystal display portion 20, namely the first display edge 20a. Here, the first display edge 20a is one side of the first sidewall 11b1. The display control portion 41 is driven by power obtained from a battery or the like within the vehicle 300, controlling the operation of the liquid crystal display portion 20 connected via the wiring portion 42.

[0069] The elastic member 50 is a rubber-like or sponge-like component disposed between the frame portion 30 and the liquid crystal display portion 20. The elastic member 50 is, for example, a seal. In an embodiment, the elastic member 50 includes a first elastic member 51 and a second elastic member 52.

[0070] The first elastic member 51 and the second elastic member 52 are respectively formed into an elongated plate or rod shape. The first elastic member 51 is disposed on one side (the third sidewall 11b3 side) of the liquid crystal display section 20 in the extension direction of the first display edge 20a, and the second elastic member 52 is disposed on the other side (the fourth sidewall 11b4 side) of the liquid crystal display section 20 in the extension direction of the first display edge 20a.

[0071] A glass plate 60 is disposed between the opening 10a of the frame 10 and the liquid crystal display unit 20. The glass plate 60 is a transparent glass component formed into a flat plate shape. In this embodiment, the glass plate 60 is formed into a rectangular plate with its shorter side in the front-to-back direction and its longer side in the width direction. The glass plate 60 is disposed between the edge of the opening 10a of the frame 10 and the liquid crystal display unit 20. The glass plate 60 functions as a heat-conducting component.

[0072] The diffuser plate 70 is a film-like component that diffuses the light source. In this embodiment, the diffuser plate 70 is formed in a rectangular shape. The diffuser plate 70 is arranged between the opening 10a of the frame 10 and the glass plate 60.

[0073] The heat-conducting plate 80 is, for example, a sheet-like component with thermal conductivity, such as a heat-conducting plate. The heat-conducting plate 80 has a thermal conductivity at least higher than that of air. In an embodiment, such as... Figure 3 and Figure 5 As shown, the heat-conducting plate 80 includes a first heat-conducting plate 81 and a second heat-conducting plate 82.

[0074] The first heat-conducting sheet 81 and the second heat-conducting sheet 82 are formed into sheets that extend in a straight line. The first heat-conducting sheet 81 and the second heat-conducting sheet 82 are disposed on the edge of the opening 10a in the upper wall 11a of the frame 10. In the embodiment, as Figure 5 As shown, at the edge of the opening 10a of the frame 10, a first heat-conducting sheet 81 is disposed on the edge of the first sidewall 11b1, and a second heat-conducting sheet 82 is disposed on the edge of the second sidewall 11b2. That is, the first heat-conducting sheet 81 and the second heat-conducting sheet 82 are separated in the front-rear direction. As described above, the first heat-conducting sheet 81 is placed inside the first groove 11c1 formed at the edge of the opening 10a of the frame 10, and the second heat-conducting sheet 82 is placed inside the second groove 11c2 formed at the edge of the opening 10a of the frame 10. The first heat-conducting sheet 81 and the second heat-conducting sheet 82 are arranged to sandwich the opening 10a of the frame 10 in the front-rear direction.

[0075] The diffuser plate 70 is located between the first heat-conducting plate 81 and the second heat-conducting plate 82. The diffuser plate 70 is configured to cover the entire opening 10a, so that light from the light source housed in the frame 10 diffuses toward the glass plate 60.

[0076] like Figure 6 As shown, a glass plate 60 is disposed on a diffuser plate 70, a first heat-conducting sheet 81, and a second heat-conducting sheet 82. Between the first heat-conducting sheet 81 and the second heat-conducting sheet 82, the lower surface of the glass plate 60 with its opening 10a side contacts the diffuser plate 70 from one end to the other in the short-side direction. Alternatively, between the first heat-conducting sheet 81 and the second heat-conducting sheet 82, the lower surface of the glass plate 60 with its opening 10a side may also be positioned opposite the diffuser plate 70 with a gap from one end to the other in the short-side direction. The glass plate 60 allows light diffused by the diffuser plate 70 to pass through towards the liquid crystal display section 20.

[0077] like Figure 7 and Figure 8 As shown, the liquid crystal display unit 20 is disposed on the glass plate 60. The liquid crystal display unit 20 emits light transmitted through the glass plate 60 as display light L from the display surface.

[0078] In an embodiment, such as Figures 8 to 10 As shown, the flexible printed circuit board portion 40 is attached to the outer surface of the side wall 11b (first side wall 11b1) of the frame 10 via an adhesive material, extending from the first display edge 20a of the liquid crystal display portion 20. That is, the wiring portion 42 of the flexible printed circuit board portion 40 is attached to the outer surface of the side wall 11b (first side wall 11b1) of the frame 10 via an adhesive material while the connection end on the liquid crystal display portion 20 side is bent. Here, double-sided tape can be used as an adhesive material, for example. In this case, for example, double-sided tape is attached to the back side of the wiring portion 42. In this state, by pressing the back side of the wiring portion 42 against the outer surface of the side wall 11b (first side wall 11b1), the wiring portion 42 can be attached to the outer surface of the side wall 11b.

[0079] In the embodiment, a space is provided between the edge of the opening 10a of the frame 10 and the edge of the first side wall 11b1 and the frame portion 30, and the wiring portion 42 is connected to the first display edge 20a of the liquid crystal display portion 20 via the space.

[0080] In the image display device 100 of the embodiment, the display control unit 41 disposed on the wiring portion 42 is fixed to the frame 10 via the wiring portion 42 by attaching the wiring portion 42 to the side wall 11b of the frame 10. Alternatively, a device for mounting the vehicle 300 (see reference 100) may be provided on the flexible printed circuit board portion 40. Figure 1The connector, etc., is electrically connected to the display control unit 41, such as the ECU (Electronic Control Unit). In this case, the connector is provided on the surface of the wiring section 42 such that it is disposed on the side wall 11b (first side wall 11b1) when the wiring section 42 is attached to the side wall 11b of the frame 10.

[0081] like Figure 9 As shown, a gap SP is provided between the first elastic member 51 and the second elastic member 52, at least between the connection end of the liquid crystal display unit 20 to the flexible printed circuit board portion 40 and the frame portion 30. By providing the gap SP between the end (connection end) on the first display edge 20a side of the liquid crystal display unit 20 and the frame portion 30, interference between the elastic member 50 and the connection portion (wiring portion 42, etc.) between the liquid crystal display unit 20 and the display control unit 41 can be suppressed.

[0082] like Figures 9 to 13 As shown, the glass plate 60 is in contact with the liquid crystal display unit 20. By making the glass plate 60 in contact with the liquid crystal display unit 20, heat from the liquid crystal display unit 20 is easily conducted to the glass plate 60. The contact area of ​​the glass plate 60 relative to the liquid crystal display unit 20 is preferably a large value. For example, the glass plate 60 is in contact with the entire back surface of the liquid crystal display unit 20. The glass plate 60 preferably covers the entire area of ​​the image display region in the liquid crystal display unit 20. As a result, the glass plate 60 can suppress localized stress on the liquid crystal display unit 20 and can suppress whitening phenomena. The thickness of the glass plate 60 can also be greater than the thickness of the liquid crystal display unit 20. The glass plate 60 in contact with the liquid crystal display unit 20 can increase the heat capacity of the liquid crystal display unit 20 and absorb the heat generated in the liquid crystal display unit 20.

[0083] The glass plate 60 in this embodiment is sapphire glass, which has a thermal conductivity at least higher than that of air. The sapphire glass is formed, for example, by artificially growing high-purity alumina into giant crystals. The sapphire glass is bonded to the liquid crystal display unit 20, for example, using optical adhesives such as OCA (Optical Clear Adhesive) or OCR (Optical Clear Resin).

[0084] Furthermore, the edge of the lower surface of the glass plate 60 contacts the upper surface of the heat-conducting sheets 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82). At least the lower surface of the heat-conducting sheets 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82) contacts the frame 10. Through this structure, the heat generated in the liquid crystal display unit 20 is transferred to the heat-conducting sheets 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82) via the glass plate 60. The heat-conducting sheets 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82) receive the heat from the liquid crystal display unit 20 via the glass plate 60 and transfer the heat to the frame 10. The frame 10 dissipates the heat received from the heat-conducting sheets 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82) to the outside.

[0085] like Figure 12 and Figure 13 As shown, in this embodiment, the image display device 100 presses the liquid crystal display unit 20 towards the frame 10 via the elastic members 50 at both ends of the liquid crystal display unit 20 through the bezel portion 30, thereby suppressing the shaking of the liquid crystal display unit 20. Additionally, it also suppresses the vertical lifting of the liquid crystal display unit 20. Furthermore, the bezel portion 30 presses the liquid crystal display unit 20, the glass plate 60, and the heat-conducting sheet 80 towards the frame 10 via the elastic members 50, thereby maintaining good contact between these components and improving thermal conductivity.

[0086] In addition, such as Figure 14 as well as Figure 15 As shown, the first groove 11c1 of the frame 10 is formed in a size and shape corresponding to the first heat-conducting sheet 81 (here, the shape is rectangular when viewed from above), and the depth of the first groove 11c1 is slightly shallower than the thickness of the first heat-conducting sheet 81. Similarly, the second groove 11c2 of the frame 10 is formed in a size and shape corresponding to the second heat-conducting sheet 82 (here, the shape is rectangular when viewed from above), and the depth of the second groove 11c2 is slightly shallower than the thickness of the second heat-conducting sheet 82. Therefore, the surface (upper surface) of the heat-conducting sheet 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82) that contacts the glass plate 60 is located closer to the glass plate 60 than the surface surrounding the groove 11c of the frame 10. According to this structure, the glass plate 60 is held in a state where it is slightly raised relative to the edge of the opening 10a of the frame 10. According to this structure, direct contact between the glass plate 60 and the frame 10 can be prevented. For example, damage to the glass plate 60 caused by the hard metal frame 10 can be prevented.

[0087] In this embodiment, a first heat-conducting sheet 81 and a second heat-conducting sheet 82 extend along the width direction. The first heat-conducting sheet 81 is configured to contact one end of the glass plate 60 along its long side, and the second heat-conducting sheet 82 is configured to contact one end of the glass plate 60 along its long side. The first heat-conducting sheet 81 contacts one end of the glass plate 60 along its long side from one end to the other in the width direction, and the second heat-conducting sheet 82 contacts one end of the glass plate 60 along its long side from one end to the other in the width direction. The entire surface of the upper surface of the first heat-conducting sheet 81 and the upper surface of the second heat-conducting sheet 82 are in contact with the lower surface of the glass plate 60. Furthermore, in this embodiment, a thermistor (not shown) mounted on an aluminum substrate is disposed below the first heat-conducting sheet 81. The thermistor is a component used to measure the temperature of the liquid crystal display section 20 via the glass plate 60. In one embodiment, a recess for accommodating a thermistor (not shown) mounted on an aluminum substrate is partially formed at the edge of the opening 10a in the frame 10. The first thermally conductive sheet 81 is arranged to cover the thermistor accommodated in the recess of the frame 10. In another embodiment, the thermally conductive sheets 80 (the first thermally conductive sheet 81 and the second thermally conductive sheet 82) are configured to contact only the two ends of the glass plate 60 along its long side. That is, the glass plate 60 does not overlap with the thermally conductive sheets 80 (the first thermally conductive sheet 81 and the second thermally conductive sheet 82) in the vertical direction, except for the two ends along its long side.

[0088] The diffuser plate 70 is disposed without overlapping the first heat-conducting sheet 81 and the second heat-conducting sheet 82 in the vertical direction. That is, the diffuser plate 70 forms a non-heat-conducting sheet area where the heat-conducting sheets 80 are not stacked. The side of the frame 10 in the glass plate 60 with the opening 10a side (the lower surface of the glass plate 60) faces the diffuser plate 70 from one end to the other in the short side direction without being separated by the heat-conducting sheets 80 (the first heat-conducting sheet 81 and the second heat-conducting sheet 82).

[0089] In this embodiment, the diffuser plate 70 and the heat-conducting plates 80 (first heat-conducting plate 81 and second heat-conducting plate 82) are mounted on the frame 10 with their respective upper surfaces coplanar. The upper surfaces of the diffuser plate 70 and the heat-conducting plates 80 (first heat-conducting plate 81 and second heat-conducting plate 82) are in contact with the glass plate 60. This structure suppresses the swaying of the glass plate 60. Furthermore, the diffuser plate 70 and the heat-conducting plates 80 also function as buffers between the rigid metal frame 10 and the glass plate 60. In addition, the first heat-conducting plate 81 is sandwiched between the glass plate 60 and the thermistor without passing through the diffuser plate 70, etc. With this structure, the thermistor can appropriately measure the temperature of the glass plate 60.

[0090] As described above, the image display device 100 of the embodiment includes: a metal frame 10 having an opening 10a formed in its upper wall 11a and housing a light source that irradiates light toward the opening 10a; a liquid crystal display unit 20 disposed at a position that closes the opening 10a and emits light from the light source as display light L for an image; a glass plate 60 disposed between the opening 10a of the frame 10 and the liquid crystal display unit 20, in contact with the liquid crystal display unit 20, and allowing light from the light source to pass through to the liquid crystal display unit 20; and a heat-conducting sheet 80 disposed between the edge of the opening 10a in the frame 10 and the edge of the glass plate 60, receiving heat from the liquid crystal display unit 20 via the glass plate 60 and transferring the heat to the frame 10.

[0091] The image display device 100 of this embodiment improves heat dissipation by transferring heat generated in the liquid crystal display unit 20 to the metal frame 10 via the glass plate 60 and the heat-conducting sheet 80. Furthermore, by placing the heat-conducting sheet 80 between the glass plate 60 and the metal frame 10, the impact on the glass plate 60 from the frame 10 during vibration of the image display device 100 can be reduced. In other words, in the image display device 100 of this embodiment, the heat-conducting sheet 80 also functions as a buffer material between the glass plate 60 and the frame 10. Additionally, it can suppress noise and other issues arising from contact between the glass plate 60 and the frame 10. According to this structure, the image display device 100 of this embodiment improves heat dissipation and vibration resistance.

[0092] In addition, in the image display device 100 of the embodiment, the glass plate 60 is formed into a rectangular plate shape, and the heat-conducting sheet 80 includes a first heat-conducting sheet 81 that contacts one end of the glass plate 60 along the long side, and a second heat-conducting sheet 82 that contacts the other end of the glass plate 60 along the long side. The first heat-conducting sheet 81 and the second heat-conducting sheet 82 are separated in the direction of the short side of the glass plate 60 along the short side.

[0093] The image display device 100 of the embodiment ensures thermal conductivity and improves the manufacturing efficiency of the heat-conducting sheet 80 by having the first heat-conducting sheet 81 and the second heat-conducting sheet 82, which are separated in the short side direction of the glass plate 60, contact the ends of the glass plate 60 along the long side, respectively. Furthermore, it also improves the workability of the installation operation of the heat-conducting sheet 80. For example, in the case of manufacturing a frame-shaped heat-conducting sheet, it needs to correspond to the shape of the edge of the frame 10, thus making the shape of the heat-conducting sheet more complex than the shape of the heat-conducting sheet 80 (first heat-conducting sheet 81 and second heat-conducting sheet 82) described above. Therefore, compared with the heat-conducting sheet 80 (first heat-conducting sheet 81 and second heat-conducting sheet 82) described above, the frame-shaped heat-conducting sheet sometimes makes it difficult to maintain a high yield. Additionally, when the heat-conducting sheet is frame-shaped, it needs to be installed in a manner that surrounds the opening 10a of the frame 10, thus sometimes impairing the workability of the installation operation compared with the heat-conducting sheet 80 (first heat-conducting sheet 81 and second heat-conducting sheet 82) described above.

[0094] In addition, the image display device 100 of the embodiment also includes a diffuser plate 70, which is disposed between the first heat-conducting sheet 81 and the second heat-conducting sheet 82, so that light from the light source diffuses toward the glass plate 60 side. Between the first heat-conducting sheet 81 and the second heat-conducting sheet 82, the surface of the glass plate 60 on the side of the opening 10a faces the diffuser plate 70 from one end to the other in the short side direction.

[0095] The image display device 100 of the embodiment ensures thermal conductivity and improves the manufacturing efficiency of the heat-conducting sheet 80 by having a first heat-conducting sheet 81 and a second heat-conducting sheet 82, which are separated in the short side direction of the glass plate 60, respectively contact the ends of the glass plate 60 along the long side. Furthermore, it also improves the workability of the heat-conducting sheet 80 installation operation. In addition, the image display device 100 of the embodiment provides a diffuser plate 70 between the first heat-conducting sheet 81 and the second heat-conducting sheet 82, thereby enabling the light from the light source to be uniformly incident on the liquid crystal display unit 20.

[0096] In addition, in the image display device 100 of the embodiment, the heat-conducting sheet 80 is placed inside the groove 11c formed at the edge of the opening 10a of the frame 10, and the surface of the heat-conducting sheet 80 that contacts the glass plate 60 is located on the side closer to the glass plate 60 than the surface around the groove 11c of the frame 10.

[0097] In the image display device 100 of this embodiment, by providing the groove 11c in the frame 10, the workability of installing the heat-conducting plate 80 into the frame 10 can be improved. Furthermore, positional displacement of the heat-conducting plate 80 relative to the frame 10 can be suppressed.

[0098] Furthermore, in the above embodiment, an example using a windshield as a display component 301 of the vehicle 300 was described, but the embodiment is not limited thereto. The display component 301 could also be a synthesizer, for example.

[0099] Furthermore, in the above embodiment, an example was described using a vehicle display device 200 having two reflective components (a first reflective component 202 and a second reflective component 203), but this is not a limitation. For example, the vehicle display device 200 may also have only one reflective component. Additionally, the vehicle display device 200 may also directly emit display light L towards the display component 301.

[0100] Furthermore, while the above embodiments used double-sided tape as an example of an adhesive material, the method is not limited to this. For example, the adhesive material could also be an adhesive, etc.

[0101] Furthermore, in the above embodiment, the example of using the elastic member 50 to include a first elastic member 51 and a second elastic member 52 has been described, but it is not limited to this. The elastic member 50 may also be provided on an end of the liquid crystal display unit 20 other than the end on the first display edge 20a side. For example, the elastic member 50 may also be a U-shaped elastic member disposed on an end of the liquid crystal display unit 20 other than the end on the first display edge 20a side. In this case, since the elastic member can also be disposed above the second heat-conducting sheet 82, the liquid crystal display unit 20, the glass plate 60, and the second heat-conducting sheet 82 can be made to contact each other more firmly.

[0102] Furthermore, in the above embodiment, an example of the glass plate 60 being bonded to the liquid crystal display unit 20 by optical adhesives such as OCA and OCR has been described, but it is not limited to this, and it may be configured to contact the liquid crystal display unit 20 by other methods.

[0103] The contents disclosed in the above embodiments can be appropriately combined to perform the tasks.

Claims

1. An image display device, characterized in that, have: A metal frame having an opening in its upper wall and housing a light source toward which light is directed; A liquid crystal display unit, wherein the liquid crystal display unit is disposed at a position that closes the opening, and emits light from the light source as display light for an image; A glass plate is disposed between the opening of the frame and the liquid crystal display unit, contacts the liquid crystal display unit, and allows light from the light source to pass through to the liquid crystal display unit; as well as A heat-conducting sheet is disposed between the edge of the opening in the frame and the edge of the glass plate, receiving heat from the liquid crystal display unit via the glass plate and transferring the heat to the frame.

2. The image display device according to claim 1, characterized in that, The glass plate is formed into a rectangular plate shape. The heat-conducting sheet includes: a first heat-conducting sheet, which contacts one end of the glass plate along its long side; and a second heat-conducting sheet, which contacts the other end of the glass plate along its long side. The first heat-conducting sheet and the second heat-conducting sheet are separated along the short side of the glass plate.

3. The image display device according to claim 2, characterized in that, The image display device further includes a diffuser plate disposed between the first heat-conducting sheet and the second heat-conducting sheet, which diffuses light from the light source toward the glass plate side. Between the first heat-conducting sheet and the second heat-conducting sheet, the surface of the glass plate on the opening side faces the diffuser plate from one end to the other in the short side direction.

4. The image display device according to any one of claims 1 to 3, characterized in that, The heat-conducting sheet is placed inside the groove formed at the edge of the frame. The surface of the heat-conducting sheet that contacts the glass plate is located closer to the glass plate side than the surface surrounding the groove of the frame.

Images