Display device for vehicle

Abstract

The present application provides a small-sized HUD device with high reliability of image display and high thermal reliability. The HUD device (1) includes an image display unit (2) including a display panel (liquid crystal panel) (22) that displays an image, and an optical system (3) that projects image light of the displayed image onto a windshield of a vehicle, and a virtual image of the image can be visually recognized through light reflected by the windshield. An effective display area (22a) of the display image of the image display unit (2) is set in an area of an end portion of the display panel (22) that is biased to one side. The optical system (3) includes a first reflection unit (31) that reflects the image light emitted from the image display unit (2), and a second reflection unit (32) that reflects the reflected light of the first reflection unit (31) toward the windshield. The image display unit (2) is disposed opposite the first reflection unit (31), and the display panel (22) is disposed in a posture with the end portion on one side facing the second reflection unit (32).

Description

Technical Field

[0001] This invention relates to display devices installed in automobiles and other vehicles, and more particularly to head-up display devices (hereinafter, HUD devices). Background Technology

[0002] As a HUD device, it is proposed to project light constituting an image onto the windshield of a car, and through the reflected light, the driver and other passengers can visually confirm the virtual image of the image. Furthermore, the situation where the virtual image can be visually confirmed will be referred to as the displayed image below. Patent Document 1 proposes a HUD device in which light (hereinafter, image light) of an image displayed on a display unit such as a liquid crystal panel is reflected sequentially by a plane mirror and a concave mirror, and then projected onto the windshield of a car, thereby visually confirming the virtual image.

[0003] In such a HUD device, in order to configure the displayed image, i.e., the size of the virtual image, to a certain extent, the focal distance of the concave mirror used to create the virtual image needs to be set to a corresponding length. In Patent Document 1, by temporarily reflecting the image light from the display unit using a plane mirror, the size of the HUD device, especially the length of the concave mirror along its optical axis, can be shortened, enabling the construction of a smaller HUD device. Furthermore, a configuration using a convex mirror instead of a plane mirror has also been proposed.

[0004] Patent Document 1: Japanese Patent Publication No. 2018-174583 Summary of the Invention

[0005] In the HUD device of Patent Document 1, to achieve further miniaturization, the display unit, plane mirror, and concave mirror need to be arranged as close as possible. However, because the HUD device of Patent Document 1 uses plane mirrors and concave mirrors to bend the light path of the image light from the display unit to the windshield in a folded state along the longitudinal direction of the car, sometimes a portion of the image light reflected by the plane mirror is blocked by the display unit. Additionally, sometimes a portion of the image light reflected by the concave mirror is blocked by the plane mirror.

[0006] Thus, if a portion of the image light is blocked, that blocked light cannot be projected onto the windshield, resulting in part of the image being undisplayed and a reduction in the display quality of the image in the HUD device. Furthermore, the blocked light can sometimes heat the display unit and the plane mirror. In particular, when a liquid crystal display unit is used, the liquid crystal device becomes susceptible to thermal damage due to the heat generated by the light source emitting the image light from it, reducing the heat resistance of the HUD device.

[0007] The purpose of this invention is to provide a small HUD device with high image display quality and high heat resistance.

[0008] The present invention is a display device for a vehicle, comprising: an image display unit having a display panel for displaying an image; and an optical system that projects image light of the displayed image onto the windshield of the vehicle, wherein the vehicle display device can visually confirm the virtual image of the image by means of the light reflected by the windshield, and the effective display area of ​​the image displayed by the image display unit is set in a region at one end of the display panel.

[0009] In a preferred embodiment of the invention, the optical system includes: a first reflective portion that reflects image light emitted from the image display portion; and a second reflective portion that reflects the reflected light from the first reflective portion toward the windshield, wherein the optical path of the image light from the image display portion to the second reflective portion is configured in a folded state. Furthermore, the image display portion and the first reflective portion are arranged opposite each other, and the display panel is arranged with one end facing the second reflective portion.

[0010] In a preferred embodiment of the image display unit of the present invention, the display panel is composed of a transmissive liquid crystal panel, which is supported on a housing. A backlight source for the liquid crystal panel and a heat sink are disposed on the housing. Furthermore, the ineffective display area of ​​the display panel, excluding the effective display area, is thermally coupled to the heat sink.

[0011] According to the present invention, a compact vehicle display device capable of preventing image light emitted from the image display unit from being blocked and displaying a suitable image of high quality can be provided. Furthermore, according to the present invention, a vehicle display device with high heat resistance and improved heat dissipation effect in the image display unit can be provided. Attached Figure Description

[0012] Figure 1 This is a conceptual diagram of a HUD device.

[0013] Figure 2 This is a schematic diagram of the HUD device viewed from the side.

[0014] Figure 3 This is a longitudinal sectional view of the image display section.

[0015] Figure 4 It is a partial exploded stereoscopic view of the image display section.

[0016] Figure 5 This is a top view of the LCD panel.

[0017] Figure 6 This is a side view that shows the positional relationship between the image display unit and the optical system of the HUD device.

[0018] Figure 7 The following are side views of (a) Reference Example 1 and (b) Reference Example 2 of the HUD device.

[0019] Figure 8 This is a side view of a simplified variation of the HUD device.

[0020] Figure 9 This is a longitudinal sectional view of a modified example 1 of the image display section.

[0021] Figure 10 This is a longitudinal sectional view of a modified example 2 of the image display section.

[0022] Figure 11 This is a longitudinal sectional view of a modified example 3 of the image display section.

[0023] Figure 12 This is a longitudinal sectional view of a modified example 4 of the image display section. Detailed Implementation

[0024] Next, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a conceptual diagram of a HUD device 1 applied to a car. The HUD device 1 is installed within the car's dashboard DB, and image light L emitted from the HUD device 1 is projected through an opening H on the upper surface of the dashboard DB onto the car's windshield (referred to as the windshield) WS. The projected image light L is reflected by the windshield WS and directed towards the car's occupants, such as the driver and passengers. This image light L enters the eyes of the occupant M, allowing them to visually confirm the virtual image I formed by the image light through the windshield WS from a position in front of the car, thus displaying the image. In this example, the speedometer image and navigation image are displayed side-by-side in the left-right direction. Furthermore, the subsequent vertical and forward / backward directions refer to the vertical and forward / backward directions relative to the car, respectively.

[0025] exist Figure 2 The diagram shows a side view of the HUD device 1. The HUD device 1 includes an image display unit 2 and an optical system 3, which projects the image displayed on the image display unit 2 onto the windshield WS. The image display unit 2 has a display panel (described later) on which an image is displayed. The optical system 3 includes: a first reflective part 31 that reflects the image light L of the image displayed on the image display unit 2; and a second reflective part 32 that further reflects the light reflected by the first reflective part 31 and projects it onto the windshield WS. The first reflective part 31 is composed of a convex mirror, and the second reflective part 32 is composed of a concave mirror.

[0026] The concave mirror 32 is composed of a spherical, aspherical, or freeform surface with curvature that corresponds to the desired focal distance. The convex mirror 31 is provided to improve the aberrations of the concave mirror 32 and substantially extend the focal distance of the concave mirror 32. Furthermore, by configuring the HUD device 1 such that the image displayed on the image display unit 2 is positioned within the focal distance of the concave mirror 32, the occupant M can visually confirm the virtual image I of the displayed image.

[0027] Figure 3 This is a cross-sectional view showing the outline of the image display unit 2. Figure 4 This is an exploded perspective view of its general structure. The image display unit 2 includes a housing 21 made of highly thermally conductive components, and a transmissive liquid crystal panel 22, which serves as the display panel, is supported on at least a portion of the upper surface of the housing 21. (As shown in...) Figure 5 As illustrated in the schematic diagram of the image display surface of the liquid crystal panel 22, a portion of this image display surface is designated as the effective display area 22a. That is, because the aspect ratio of the image display surface of the liquid crystal panel 22 is related to the aspect ratio of the image display surface, the effective display area 22a is defined as a portion of the image display surface. Figure 1 Since the aspect ratio of the image I displayed on the windshield WS is different, the area corresponding to the aspect ratio of the image I in the entire area of ​​the image display surface is set as the effective display area 22a, so that the image I is displayed in the effective display area 22a.

[0028] In this embodiment, the aspect ratio of the image display surface of the liquid crystal panel 22 is 3:4, and in contrast, the aspect ratio of the displayed image is approximately 1:2. Therefore, the area satisfying this image aspect ratio is designated as the effective display area 22a. Furthermore, due to the liquid crystal panel 22's... Figure 5 The left side corresponds to the bottom of the displayed image, so the left side of the LCD panel 22 is set as the bottom of the screen. Therefore, the effective display area 22a is set at an angle to the left. Figure 5 The area at the left end, that is, the area corresponding to the lower side of the screen of the liquid crystal panel 22. The area to the right of the effective display area 22a of the liquid crystal panel 22 is set as an invalid display area 22b that does not contribute to the display of the image.

[0029] The area of ​​the housing 21 corresponding to the effective display area 22a of the liquid crystal panel 22 constitutes a light source chamber 21a recessed from the upper surface downwards. A backlight source 23 is disposed on the inner bottom surface of this light source chamber 21a. The backlight source 23 is composed of a circuit board 23b on which LEDs (light-emitting diodes) 23a are mounted. When the LEDs 23a emit light, the white light emitted is projected onto the back side of the liquid crystal panel 22. The inner wall of the light source chamber 21a is inclined in a manner extending from the LEDs 23a toward the liquid crystal panel 22, and the white light from the LEDs 23a is reflected onto the liquid crystal panel 22. The white light projected onto the liquid crystal panel 22 is emitted as image light with the desired hue through the liquid crystal panel 22.

[0030] After the liquid crystal panel 22 is placed on the upper surface of the housing 21, it is fixed to the housing 21 by a cover 24 that covers it from above. The cover 24 has an opening 24a in one part that exposes the effective display area 22a of the liquid crystal panel 22, and is installed in a manner that covers other areas including the ineffective display area 22b of the liquid crystal panel 22 and fits into the housing 21 with the periphery of the cover 24.

[0031] Heat transfer sheets 25 and 26, made of highly thermally conductive elastic material, are respectively sandwiched between the housing 21 and the liquid crystal panel 22, and between the liquid crystal panel 22 and the cover 24. Openings 25a and 26a, exposing the effective display area 22a, are formed in the heat transfer sheets 25 and 26. Furthermore, each heat transfer sheet 25 and 26 utilizes its own elasticity to even out the external force applied to the liquid crystal panel 22, preventing localized stress that could cause mechanical damage to the liquid crystal panel 22. The heat transfer sheets 25 and 26 are disposed in the peripheral area of ​​the liquid crystal panel 22, and in the area of ​​the ineffective display area 22b, excluding the effective display area 22a.

[0032] Furthermore, the housing 21 has multiple heat sinks 21b formed on its outer wall surface, excluding the light source chamber 21a. These heat sinks 21b dissipate heat generated in the housing 21, particularly heat generated by the LED 23a and heat generated in the liquid crystal panel 22. Typically, in HUD devices with high image magnification, the light density of the displayed image decreases, thus requiring the use of high-brightness LEDs, which generate more heat. Additionally, the heat generated by the liquid crystal panel due to light absorption also increases.

[0033] In the image display unit 2 configured as described above, if the liquid crystal panel 22 is driven by a control unit (not shown in the figure), a predetermined image is displayed in the effective display area 22a of the liquid crystal panel 22. Here, as... Figure 5 As shown schematically in the diagram, with Figure 1The image I shown corresponds to the speedometer image and navigation image displayed side by side in the left-right direction. Simultaneously, LED 23a emits light, and the white light emitted from LED 23a illuminates the effective display area 22a. The white light emitted from LED 23a is reflected by the inner wall of the light source chamber 21a and illuminates the effective display area 22a as a backlight with uniform brightness distribution. Thus, the light that transmits through the displayed image I, i.e., the image light L, is emitted from the liquid crystal panel 22.

[0034] In this way, when the light from LED 23a passes through the liquid crystal panel 22, a portion of the light is converted into heat in the liquid crystal panel 22, and the remaining heat is generated due to the LED 23a emitting light. This heat is transferred to the housing 21, and another portion of the heat is transferred to the housing 21 via the cover 24, and then to the heat sink 21b formed in the housing 2 as a heat sink, from which heat is dissipated. In particular, the inactive display area 22b of the entire area of ​​the liquid crystal display panel 22, excluding the effective display area 22a, is in close contact with the housing 21 and the cover 24 via heat transfer sheets 25 and 26, thus maximizing the heat dissipation area of ​​the liquid crystal panel 22 and improving the heat dissipation effect. This heat dissipation can suppress the temperature rise of the liquid crystal panel 22 and improve the thermal reliability of the liquid crystal panel 22.

[0035] like Figure 2 As shown, the image display unit 2 configured in this way is disposed in the area below the convex mirror 31 of the optical system 3. Figure 6 This is an enlarged side view showing the general positional relationship between the image display unit 2 and the optical system 3. Taking the longitudinal direction of the vehicle as a reference, the image display unit 2 is positioned diagonally below and in front of the convex mirror 31. Image light emitted from the effective display area 22a of the liquid crystal panel 22 is projected onto the convex mirror 31. This projected image light is reflected forward by the convex mirror 31, projected onto the concave mirror 32, and then reflected again before being projected onto the windshield WS of the vehicle through the opening H on the upper surface of the instrument panel DB. Therefore, the image light from the liquid crystal panel 22 is projected onto the windshield WS via a light path folded along the longitudinal direction of the vehicle.

[0036] Here, as in Figure 7As shown in Reference Example 1 in (a), when the image display unit 2A is brought close to the area below the convex mirror 31, sometimes a portion X1 of the image display unit 2A enters the optical path of the image light L, and a portion of the image light L is blocked. That is, as shown in the dot plot in the same figure, sometimes a portion of the image light L emitted from the effective display area 22a of the liquid crystal panel 22 is blocked and cannot be projected onto the windshield WS, so a suitable image cannot be displayed. In particular, in image display units 2A where the effective display area 22a is set in the central area of ​​the screen in the vertical direction of the liquid crystal panel 22 or in the upper direction of the screen, when the effective display area 22a is set at a predetermined position relative to the convex mirror 31, if the image display unit 2A is positioned biased towards the concave mirror 32, a portion X1 of the image display unit 2A can easily enter the optical path of the image light L.

[0037] Thus, if the position of the image display unit 2A or the convex mirror 31 is adjusted to prevent a portion of the image display unit 2A from entering the optical path of the image light L reflected by the convex mirror 31, then... Figure 7 As shown in Reference Example 2 in (b), sometimes a portion X2 of the convex mirror 31 enters the optical path of the image light L reflected by the concave mirror 32. As illustrated in the same figure, in this case, a portion of the image light L projected onto the windshield WS is also blocked, making it impossible to display a suitable image. In particular, if the radius of curvature of the concave mirror 32 is increased to increase the magnification of the displayed image, the area of ​​the optical path of the image light L expands, and a portion X2 of the convex mirror 31 easily enters the optical path.

[0038] In the image display unit 2 of the described embodiment, the effective display area 22a of the liquid crystal panel 22 is disposed in a region at an end that is biased toward one end corresponding to the downward direction of the image display unit 2. Furthermore, the image display unit 2 is positioned with this end facing the side where the image light L is reflected in the convex mirror 31, i.e., the side of the concave mirror 32 located in front. In other words, when a predetermined normal is imagined on the reflective surface of the convex mirror 31, the liquid crystal panel 22 is disposed on one side of this normal, the concave mirror 32 is disposed on the other side of the normal, and the effective display area 22a of the liquid crystal panel 22 is disposed with its orientation toward the side closest to this normal.

[0039] Therefore, even when the image display unit 2 is arranged in a predetermined position with respect to the convex mirror 31 at the effective display area 22a, a portion of the image display unit 2 will not protrude significantly forward relative to the convex mirror 31. That is, even when the image display unit 2 is arranged in a predetermined positional relationship with respect to the convex mirror 31 at the effective display area 22a, a portion of the image display unit 2 will not protrude significantly forward relative to the convex mirror 31. Figure 7Compared to Reference Examples 1 and 2 shown in (a) and (b), the front part of the image display unit 2 will not enter the optical path of the image light L reflected by the convex mirror 31.

[0040] Therefore, it is possible to prevent a portion of the image light L reflected by the convex mirror 31 from being blocked by the image display unit 2, as in Reference Example 1, and to display a suitable image. Furthermore, by doing so, the relative distance between the convex mirror 31 and the image display unit 2 can be reduced, which is beneficial for miniaturization of the HUD device 1. At the same time, by making the convex mirror 31 smaller, it is also possible to prevent the convex mirror 31 from entering the optical path of the image light L reflected by the concave mirror 32, as in Reference Example 2. Therefore, even if the radius of curvature of the concave mirror 32 is reduced and the end of the concave mirror 32 protrudes towards the display device 2 in order to increase the magnification of the displayed image, a suitable image can still be displayed.

[0041] In this invention, such as Figure 8 As shown in the modified example of the HUD device, the first reflective element can also be composed of a concave mirror 31A. Alternatively, although not shown in the figure, the first reflective element can also be composed of a plane mirror. Figure 8 In a modified example, concave mirror 31A is referred to as the first concave mirror, and concave mirror 32, identical to that in the previous embodiment, is referred to as the second concave mirror. Thus, when the first concave mirror 31A is used to form a convex mirror, the vertical positional relationship between the image display unit 2 and the first concave mirror 31A can be reversed. Consequently, the image light reflected by the first concave mirror 31A becomes a nearly horizontal optical path, making it difficult for the image display unit 2 to enter the respective optical paths of the image light L reflected by the first concave mirror 31A and the image light L reflected by the second concave mirror 32. Therefore, the distance between the image display unit 2 and the first concave mirror 31A can be further reduced. This configuration of having the first concave mirror 31A is suitable for use in HUD devices where the radius of curvature of the second concave mirror 32 is sufficiently large.

[0042] Furthermore, in this invention, the housing 21 of the image display unit 2 is a reflective optical system, but it can also be appropriately changed to a refractive type such as a lens. Additionally, the heat dissipation structure formed in the housing 21 can also be appropriately modified. In the following variations, the same reference numerals are used for parts equivalent to those in the described embodiment, and detailed descriptions are omitted. Figure 9This is a longitudinal sectional view of a modified example 1 of the image display unit 2. The spacing and number of heat sinks 21b formed on the housing 21 are partially different. In addition, although not shown in the figure, the size of the heat sinks can also be partially different. Although not shown in the figure, a portion of the housing 21 and the heat sinks 21b can be changed to a material with low thermal conductivity. By appropriately designing the shape of the heat sinks 21b, the heat dissipation distribution of the housing 21 can be controlled, and suitable heat dissipation effects can be obtained for both the LED 23a and the LCD panel 22.

[0043] Figure 10 This is a longitudinal sectional view of a modified example 2 of the image display unit 2. A cooling fan 27 is mounted opposite the heat sink 21b formed on the housing 21. When the image display unit 2 is driven, the cooling fan 27 is driven synchronously, thereby improving the heat dissipation effect of the housing 21, i.e., the heat sink 21b. This cooling fan 27 can also be applied to… Figure 9 The housing 21 of the image display unit 2 shown in the modified example 1.

[0044] Figure 11 This is a longitudinal sectional view of a modified example 3 of the image display unit 2. An auxiliary heat sink 28 is integrally formed on a portion of the cover 24. That is, one or more auxiliary heat sinks 28 are integrally formed on a portion of the surface of the cover 24, particularly in the area corresponding to the unused display area 22b of the liquid crystal panel 22. In this configuration, heat generated in the liquid crystal panel 22 is transferred from the unused display area 22b to the cover 24 and dissipated from the auxiliary heat sink 28. Thus, since heat is dissipated from a relatively large area of ​​the unused display area 22b, the heat dissipation effect can be improved. The auxiliary heat sink 28 is configured in a way that does not interfere with other components such as the convex mirror 31 when it is installed in the HUD device 1.

[0045] Figure 12 This is a longitudinal sectional view of a modified example 4 of the image display unit 2. No heat sink is formed on the housing 21, and the housing 21 is thermally connected to a separate heat sink 4 via a heat pipe 29. Here, the separate heat sink 4 is disposed outside the housing 11 of the HUD device 1, which houses the image display unit 2. Furthermore, the housing 21 and the separate heat sink 4 are connected by a heat pipe 29 that extends through the housing 11. Heat generated by the LED 23a and the liquid crystal panel 22 is transferred from the housing 21 to the separate heat sink 4 via the heat pipe 29, and then dissipated from the separate heat sink 4. Since the separate heat sink 4 is disposed outside the housing 11, the heat dissipation effect can be further improved. Similarly, as in modified example 4, the separate heat sink 4 can be connected from the cover 24 via the heat pipe 29, thereby improving the heat dissipation effect.

[0046] In the above embodiments and variations, the heat transfer sheets 25 and 26 provided on the image display unit 2 are preferably made of materials with high thermal conductivity and the effect of absorbing stress between the liquid crystal panel 22 and the housing 21 and cover 24; for example, thermal grease can be used. However, when using thermal grease, it is easy to imagine that due to the influence of the operating environment, the grease may flow out and adhere to the effective display area 22a. Therefore, it is of course possible to provide a structure at the boundary between the effective display area and the heat transfer sheets 25 and 26 to prevent flow out.

[0047] In this invention, since the display panel of the image display unit 2 only needs to be configured to emit image light corresponding to the displayed image, it can also be configured as a DMD device that arranges a matrix of tiny mirrors to selectively reflect light from a light source and emit image light. Alternatively, it can be configured as an organic EL or an electrochromic element.

[0048] The windshield of the present invention is not limited to the windshield of a car described in the embodiments, but may also be a part of the vehicle body such as a light-transmitting window.

[0049] This international application claims priority based on Japanese Patent Application No. 2020-098086, filed on June 5, 2020, the entire contents of which are incorporated herein by reference.

[0050] The above description of specific embodiments of the present invention is provided for illustrative purposes. These descriptions are not intended to be exhaustive or to limit the invention to the described embodiments only. It will be apparent to those skilled in the art that numerous modifications and alterations can be made with reference to the above description.

[0051] Explanation of reference numerals in the attached figures

[0052] 1 HUD device

[0053] 2 Image display unit

[0054] 3 Optical System

[0055] 4 Split-type radiators

[0056] 21. Shell

[0057] 21b heatsink

[0058] 22-inch display panel (LCD panel)

[0059] 22a Effective display area

[0060] 22b Invalid display area

[0061] 23 Backlight source

[0062] 23A LED (Light Emitting Diode)

[0063] 24 lids

[0064] Heat transfer plates 25 and 26

[0065] 27 Cooling Fan

[0066] 28 Auxiliary heat sink

[0067] 29 Heat pipe

[0068] 31 First reflecting part (convex mirror)

[0069] 32 Second reflecting part (concave mirror)

[0070] WS windshield

[0071] L Image Light

[0072] I. Virtual Image (Displaying Image)

Claims

1. A display device for a vehicle, characterized in that, The vehicle display device includes: An image display unit includes a display panel for displaying images; and The optical system projects the image light of the displayed image onto the vehicle's windshield. The vehicle display device allows the virtual image of the image to be visually confirmed by light reflected from the windshield. The optical system includes: a first reflector that reflects image light emitted from the image display unit forward, with the vehicle's longitudinal direction as a reference; and a second reflector that reflects the reflected light from the first reflector towards the windshield. The image display unit is positioned opposite the first reflective unit, and the display panel is positioned with one end facing the second reflective unit located in front. The image display unit includes an effective display area for displaying the image and an invalid display area that does not contribute to the display of the image. The effective display area is located at one end of the display panel that is biased toward the second reflective portion side.

2. The vehicle display device according to claim 1, characterized in that, The optical path of the image light from the image display unit to the second reflective unit is set to a folded state.

3. The vehicle display device according to claim 1, characterized in that, The first reflecting part is composed of any one of a convex mirror, a plane mirror, and a concave mirror, and the second reflecting part is composed of a concave mirror.

4. The vehicle display device according to any one of claims 1 to 3, characterized in that, When a normal is imagined on the reflective surface of the first reflective part, the image display part is disposed on one side of the normal, the second reflective part is disposed on the other side, and the image display part is disposed such that one end of the display panel faces the side closer to the normal.

5. The vehicle display device according to claim 1, characterized in that, The display panel is composed of a transmissive liquid crystal panel or an electrochromic element, at least a portion of which is supported on a housing. The housing is provided with a light source for the backlight of the liquid crystal panel and a heat sink.

6. The vehicle display device according to claim 5, characterized in that, The invalid display area of ​​the display panel, excluding the effective display area, is thermally coupled to the heat sink.

7. The vehicle display device according to claim 5 or 6, characterized in that, The radiator has heat dissipation fins formed as part of the housing.

8. The vehicle display device according to claim 7, characterized in that, The vehicle display device includes a cooling fan positioned opposite the heat sink.

9. The vehicle display device according to claim 5 or 6, characterized in that, A heat pipe is connected to the housing, and the housing is connected via the heat pipe to a radiator formed independently of the housing.

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