JP2021084547A - Vehicular display device - Google Patents

Abstract

To provide a vehicular display device which facilitates thickness reduction of the device.SOLUTION: A vehicular display device includes: a display panel 10; a circuit board 11; a processor 12 (a circuit element); a noise blocking plate 40; and a heat radiation member 50. The noise blocking plate 40 is disposed so as to cover the processor 12 from the back side of the display panel 10 when viewed in a visible direction, blocks electromagnetic noise, and is made of a metal. The heat radiation member 50 has a heat receiving surface 52, a first heat radiation surface 53, and a second heat radiation surface 54. The heat receiving surface 52 receives heat from the processor 12 through a first heat transmission material 12g. The first heat radiation surface 53 radiates heat to the noise blocking plate 40 through a second heat transmission material 40g. The second heat radiation surface 54 radiates heat into air. The heat radiation member 50 is made of a metal having heat conductivity higher than that of the noise blocking plate 40.SELECTED DRAWING: Figure 4

Description

The disclosure herein relates to a vehicle display device that is visible to the occupants of the vehicle.

Patent Document 1 describes a structure in which heat generated by a CPU is dissipated from the heat sink by attaching a heat sink to the CPU via a graphite sheet. The heat sink has a shape having a plurality of heat radiation fins.

Japanese Unexamined Patent Publication No. 2008-78564

In recent years, there has been an increasing demand for thinner screens and thinner display devices for vehicles that are visible to the occupants of the vehicle. Therefore, applying the structure of Patent Document 1 to the heat dissipation structure for the circuit element provided in the vehicle display device has a limit in promoting the thinning.

One object disclosed is to provide a vehicle display device for promoting the thinning of the device.

One disclosed means of achieving the above objectives is:
A display panel (10) visible to the occupants of the vehicle and
The circuit board (11) arranged on the back side of the display panel in the viewing direction with respect to the display panel,
A circuit element (12) that is mounted on the inner surface of the circuit board in the visual direction and generates heat as it operates.
A metal noise blocking plate (40) that is arranged so as to cover at least the circuit element from the back side in the visual viewing direction and blocks electromagnetic noise.
It is arranged between the noise blocking plate and the circuit element, and dissipates heat to the noise blocking plate via the heat receiving surface (52) and the second heat transmitting material (40 g) that receive heat from the circuit element via the first heat transfer material (12 g). A heat radiating member (50) having a first heat radiating surface (53) and a second heat radiating surface (54) that dissipates heat in the air.
With
The heat radiating member is a display device for vehicles, which is made of metal and has a higher thermal conductivity than the noise blocking plate.

According to the vehicle display device disclosed here, a part of the heat generated in the circuit element is transmitted to the noise blocking plate via the heat radiating member, and is dissipated in the air from the noise blocking plate. In this way, since the noise blocking plate can be used for heat dissipation, it is possible to promote the thinning of the vehicle display device while ensuring sufficient heat dissipation performance.

Further, while the heat radiating member is made of metal having high thermal conductivity, the heat radiating member is provided with a second heat radiating surface that dissipates heat in the air in addition to the first heat radiating surface that dissipates heat to the noise blocking plate. Therefore, as compared with the case where the heat radiating member is abolished and the noise blocking plate receives heat directly from the circuit element, the heat radiating performance can be improved at least for the air radiated portion from the second heat radiating surface.

The reference numbers in parentheses are merely examples of the correspondence with the specific configuration in the embodiment described later, and do not limit the technical scope at all.

It is a front view which looked at the vehicle display device which concerns on 1st Embodiment from the visual direction. It is an exploded perspective view of the display device for a vehicle which concerns on 1st Embodiment. It is a front view which shows the state which the heat radiating member is attached to the noise blocking plate in 1st Embodiment. In the first embodiment, it is sectional drawing which cut | cut the display device for a vehicle in the yz plane.

Hereinafter, a plurality of embodiments of the present disclosure will be described with reference to the drawings. By assigning the same reference numerals to the corresponding components in each embodiment, duplicate description may be omitted. When only a part of the configuration is described in each embodiment, the configurations of the other embodiments described above can be applied to the other parts of the configuration.

(First Embodiment)
The vehicle display devices shown in FIGS. 1 to 4 are attached to an instrument panel IP (see FIG. 1) arranged in the vehicle interior. The instrument panel IP is located on the front side of the vehicle with respect to the front seat occupants such as the driver. This display device displays, for example, a vehicle state such as the amount of electricity stored in the in-vehicle battery and a running state such as the vehicle speed.

As shown in FIGS. 2 and 3, the display device includes a display panel 10, a circuit board 11, a relay board 14, a cover 20, a support plate 30, a noise blocking plate 40, and a heat radiating member 50. The arrow z in FIG. 2 indicates the viewing direction of the occupant on the display device when the display device is attached to the instrument panel IP. The arrow y indicates a direction perpendicular to the viewing direction and along the front-rear direction of the vehicle. The arrow x indicates a direction perpendicular to the viewing direction and along the left-right direction of the vehicle.

The cover 20 is exposed from the instrument panel IP and is visible to the occupants of the vehicle. The cover 20 has a frame portion 21 and a window portion 22. The window portion 22 is made of a translucent resin, and the frame portion 21 is made of a light-shielding resin. The frame portion 21 and the window portion 22 are integrally formed by two-color molding.

The display panel 10 displays an image visually recognized by the occupant. Although organic electroluminescence is used for the display panel 10 according to the present embodiment, the backlight and the liquid crystal panel may be replaced with organic EL. The display panel 10 is arranged behind the cover 20 in the viewing direction (z direction).

Although not shown in FIG. 2, the display panel 10 is attached to the back surface of the cover 20 by a translucent adhesive sheet 20A (see FIG. 4). Further, the display panel 10 has a shape curved around an axis extending in the x direction. The bending direction is the direction in which it protrudes to the back side in the z direction.

The support plate 30 has a rigid resin plate shape, and is arranged on the back side in the viewing direction with respect to the display panel 10. The support plate 30 supports the display panel 10 so as to hold the display panel 10 in a desired curved shape.

The circuit board 11 is connected to the display panel 10 by the flexible wiring 11a. A flexible flat cable (FFC) is used for the flexible wiring 11a according to the present embodiment. This FFC may be replaced by a flexible printed circuit (FPC). The flexible wiring 11a is folded 180 degrees from the unfolded state shown in FIG. 2 and is in the state shown in FIG. Due to this folding back, the circuit board 11 is located on the back side in the viewing direction with respect to the display panel 10 and on the back side of the support plate 30.

A processor 12, a memory, and the like are mounted on the circuit board 11. The processor 12 and the memory function as an image control device together with the circuit board 11. The image control device outputs an image signal to the display panel 10 through the flexible wiring 11a. The processor 12 corresponds to a "circuit element" that generates heat as it operates.

The noise blocking plate 40 is located on the back side in the visual viewing direction with respect to the circuit board 11, and is assembled to the support plate 30. The noise blocking plate 40 is made of metal (for example, iron-based metal) and shields electromagnetic noise radiated from the image control device to the outside. Alternatively, it shields external electromagnetic noise radiated from the outside of the image control device. The noise blocking plate 40 is arranged so as to cover at least the processor 12 from the back side in the viewing direction. In the example shown in FIG. 4, the noise blocking plate 40 is arranged so as to cover the entire circuit board 11 from the back side in the viewing direction.

The noise blocking plate 40 has a plurality of flat portions 41, 42, 43 arranged in the y direction. In the example shown in FIGS. 2 and 4, three flat portions 41, 42, and 43 are arranged along the curved shape of the support plate 30.

The heat radiating member 50 is arranged between the noise blocking plate 40 and the circuit board 11. The heat radiating member 50 has a plate shape that extends along the plate surface of the flat portion 41 of the noise blocking plate 40. As the material of the heat radiating member 50, a metal having a higher thermal conductivity than the noise blocking plate 40, such as copper or aluminum, is used.

The heat radiating member 50 has a heat receiving surface 52, a first heat radiating surface 53, and a second heat radiating surface 54. The heat receiving surface 52 and the second heat radiating surface 54 are provided on the surface (surface) of both sides of the heat radiating member 50 that faces the circuit board 11. The first heat radiating surface 53 is provided on the side surface (back surface) of both sides of the heat radiating member 50 that faces the noise blocking plate 40. The plate thickness of the heat radiating member 50 may be larger or smaller than the plate thickness of the noise blocking plate 40.

The surface 12a of the processor 12 is pressed against the heat receiving surface 52 via the first heat transfer material 12g. The first heat transfer material (12 g) is a sheet-shaped heat conductive gel having high heat conductivity and electrical insulation. The first heat transfer material 12g is deformed so as to be in close contact with the surface 12a and the heat receiving surface 52 of the processor 12. As a result, a part of the heat generated by the processor 12 is transferred from the heat receiving surface 52 to the heat radiating member 50 via the first heat transfer material 12g.

The flat portion 41 of the noise blocking plate 40 is pressed against the first heat radiating surface 53 via the second heat transfer material 40 g. The second heat transfer material 40 g is a heat conductive gel having high thermal conductivity and electrical insulation, and is applied to the entire surface of the first heat radiation surface 53. The second heat transfer material 40 g is applied to the entire back surface of the heat radiating member 50, and the entire back surface of the heat radiating member 50 functions as the first heat radiating surface 53. The second heat transfer material 40 g is deformed so as to be in close contact with the flat portion 41 and the first heat radiation surface 53. As a result, a part of the heat transferred from the processor 12 to the heat radiating member 50 is transferred from the first heat radiating surface 53 to the flat portion 41 via the second heat transfer material 40 g. Then, the heat transferred to the flat portion 41 is radiated to the air (heat radiation in the air) from the flat portions 41, 42, 43, respectively.

The second heat radiating surface 54 is the entire surface of the heat radiating member 50 other than the heat receiving surface 52. The second heat radiating surface 54 is distributed so as to surround the heat receiving surface 52. The second heat radiating surface 54 is formed in an area larger than the heat receiving surface 52. A part of the heat transferred from the processor 12 to the heat radiating member 50 is radiated to the air from the second heat radiating surface 54.

The heat radiating member 50 is fixed to the noise blocking plate 40 with a second heat transfer material 40g interposed between the heat radiating member 50 and the noise blocking plate 40. Hereinafter, this fixed structure will be described.

A plurality of through holes 51 are formed in the heat radiating member 50. All the through holes 51 are formed at positions avoiding the heat receiving surface 52, that is, on the second heat radiating surface 54. The number of through holes 51 is preferably 3 or more. The noise blocking plate 40 is formed with protrusions 44 to be inserted into the respective through holes 51. The protrusion 44 has a burring shape formed by subjecting the plate surface of the noise blocking plate 40 to burring. At the tip of the protrusion 44, an engaging portion 44a that is plastically deformed so as to engage with the second heat radiating surface 54 is formed. In short, the heat radiating member 50 is caulked and fixed to the flat portion 41 of the noise blocking plate 40 at a plurality of locations by the engaging portion 44a.

When heat is trapped in the space (internal space) between the circuit board 11 and the noise blocking plate 40, air heat dissipation from the processor 12 and the second heat radiating surface 54 is hindered. Therefore, communicating the internal space with the external space (external space) to promote the movement of air between the internal space and the external space is effective in promoting air heat dissipation. In view of this point, the noise blocking plate 40 according to the present embodiment is formed with a plurality of vents 42a and 43a for flowing the atmosphere of the processor 12 and the second heat radiating surface 54.

The vent 42a is formed in the flat portion 42, and the vent 43a is formed in the flat portion 43. In other words, the vents 42a and 43a are formed on both sides of the noise blocking plate 40 with the first heat radiating surface 53 interposed therebetween. Wiring 17 connected to the circuit board 11 is inserted and arranged in the vent 42a. A flexible flat cable (FFC) is used for the wiring 17. This FFC may be replaced by a flexible printed circuit (FPC).

The relay board 14 is located on the back side in the visual viewing direction with respect to the noise blocking plate 40. The relay board 14 is connected to the circuit board 11 by wiring 17. One end of the wiring 17 is fitted into the connector 13 mounted on the circuit board 11, and the other end of the wiring 17 is fitted into the connector 15 mounted on the relay board 14. The fitting direction of the wiring 17 into the connector 13 is from the front side to the rear side in the y direction, that is, from the right side to the left side in FIG. The fitting direction of the wiring 17 into the connector 15 is also the direction from the front side to the rear side in the y direction. Therefore, the wiring 17 is folded 180 degrees and is in the state shown in FIG.

Further, the connector 16 mounted on the relay board 14 is connected to an electronic control unit (ECU) (not shown) provided outside the display device by a wiring (not shown). The fitting direction of the wiring to the connector 16 is from the rear side to the front side in the y direction, that is, from the left side to the right side in FIG. In short, the relay board 14 has a function of relaying the connection between the circuit board 11 and the ECU, and a function of converting the rear-facing connector 13 into the front-facing connector 16.

Hereinafter, the effect of having the above-mentioned configuration will be described.

A heat radiating member 50 is arranged between the noise blocking plate 40 and the processor 12. The heat radiating member 50 has a heat receiving surface 52 that comes into close contact with the processor 12 via the first heat transfer material 12 g, and a first heat radiating surface 53 that comes into close contact with the noise blocking plate 40 via the second heat transfer material 40 g. Further, the heat radiating member 50 has a second heat radiating surface 54 that dissipates heat in the air, and is made of metal (for example, copper or aluminum) having a higher thermal conductivity than the noise blocking plate 40.

Therefore, a part of the heat generated by the processor 12 is transmitted to the noise blocking plate 40 via the heat radiating member 50, and is dissipated in the air from the noise blocking plate 40. As described above, since the noise blocking plate 40 can be used for heat dissipation, it is possible to promote the thinning of the display device while ensuring sufficient heat dissipation performance.

Further, while the heat radiating member 50 is made of metal having high thermal conductivity, the heat radiating member 50 is provided with a second heat radiating surface 54 that dissipates heat in the air in addition to the first heat radiating surface 53 that radiates heat to the noise blocking plate 40. ing. Therefore, as compared with the case where the heat radiating member 50 is abolished and the noise blocking plate 40 receives heat directly from the processor 12, the heat radiating performance can be improved at least for the air radiated portion from the second heat radiating surface 54.

If the heat radiating member 50 is abolished and a metal having high thermal conductivity such as copper or aluminum is used as the material of the noise blocking plate 40, the following problems occur. That is, when the noise blocking plate 40 is formed into a desired shape by press working or the like, its workability is significantly deteriorated. Therefore, according to the present embodiment in which the heat radiating member 50 having high thermal conductivity is interposed between the noise blocking plate 40 and the processor 12, the heat radiating performance can be improved without causing deterioration in workability of the noise blocking plate 40.

The heat radiating member 50 has a plate shape that extends along the plate surface of the flat portion 41 of the noise blocking plate 40. Further, the second heat radiating surface 54 is provided on the plate surface of the heat radiating member 50 on the same side as the heat receiving surface 52, and is formed in an area larger than the heat receiving surface 52.

According to this, since the heat radiating member 50 has a plate shape, it is possible to improve the heat radiating performance while suppressing the increase in size of the display device in the viewing direction. Further, the second heat radiating surface 54 is provided on the same side as the heat receiving surface 52. Therefore, as compared with the case where the second heat radiating surface 54 is provided on the side of the first heat radiating surface 53, both the first heat radiating surface 53 and the second heat radiating surface 54 can be enlarged to improve the heat radiating performance.

The noise blocking plate 40 has a protrusion 44 that is inserted into the through hole 51 of the heat radiating member 50. At the tip of the protrusion 44, an engaging portion 44a that is plastically deformed so as to engage with the second heat radiating surface 54 is formed. The heat radiating member 50 is caulked and fixed to the noise blocking plate 40 by the engaging portion 44a. Therefore, the structure of fixing the heat radiating member 50 to the noise blocking plate 40 can be made thinner than the case of fixing with a tapping screw or bolts and nuts, and by extension, the thinning of the display device can be promoted.

The noise blocking plate 40 is formed with vents 42a and 43a for flowing the atmosphere of the second heat radiating surface 54. Therefore, it is possible to suppress heat from being trapped in the space (internal space) between the circuit board 11 and the noise blocking plate 40, and it is possible to promote heat dissipation in the air from the processor 12 and the second heat radiating surface 54.

The vents 42a and 43a are formed on both sides of the noise blocking plate 40 with the first heat radiating surface 53 interposed therebetween. Therefore, the air flowing in from the vent 42a located on one side of the heat radiating member 50 flows out from the vent 43a located on the other side. Therefore, since an air flow can be formed across the heat radiating member 50, air heat radiating from the heat radiating member 50 can be promoted.

Wiring 17 connected to the circuit board 11 is inserted and arranged in the vent 42a. Therefore, since the holes for inserting and arranging the wiring 17 can be used as the ventilation holes 42a, the number of holes formed in the noise blocking plate 40 can be reduced and the strength decrease of the noise blocking plate 40 can be suppressed.

(Other embodiments)
Although the plurality of embodiments of the present disclosure have been described above, not only the combination of the configurations specified in the description of each embodiment but also the plurality of embodiments even if the combination is not specified if there is no problem in the combination. Can be partially combined with each other. Further, it is assumed that the unspecified combination of the configurations described in the plurality of embodiments and modifications is also disclosed by the following description.

The second heat radiating surface 54 is provided on the plate surface of the heat radiating member 50 on the same side as the heat receiving surface 52. On the other hand, the second heat radiating surface 54 may be provided on the plate surface of the heat radiating member 50 on the opposite side of the heat receiving surface 52.

The first heat radiating surface 53 is provided on a plate surface of the heat radiating member 50 on the opposite side of the heat receiving surface 52. On the other hand, the first heat radiating surface 53 may be provided on the plate surface of the heat radiating member 50 on the same side as the heat receiving surface 52.

The second heat radiating surface 54 is formed in an area larger than the heat receiving surface 52, but may be formed in an area smaller than the heat receiving surface 52.

In the first embodiment, the circuit element to be heat-dissipated is the processor 12, but the heat-dissipating target is not limited to the processor 12 as long as it is a circuit element that generates heat as it operates.

In the first embodiment, the heat radiating member 50 has a plate shape, but may have a shape having a plurality of heat radiating fins.

In the first embodiment, the heat radiating member 50 is caulked and fixed to the noise blocking plate 40, but a fixing structure such as a bolt nut or a clip may be used.

In the first embodiment, the vents 42a and 43a are formed on both sides of the noise blocking plate 40 with the first heat radiating surface 53 interposed therebetween. On the other hand, the vent on one side of the first heat radiating surface 53 may be abolished and only the vent on the other side may be used. Alternatively, these vents 42a and 43a may be abolished.

Although the display panel 10 has a curved shape, the display panel 10 may have a flat shape. Further, the display panel 10 is not limited to the organic EL and the liquid crystal panel.

10 Display panel, 11 Circuit board, 12 Circuit elements, 12g 1st heat transfer material, 17 Wiring, 40 Noise blocking plate, 40g 2nd heat transfer material, 42a, 43a Vents, 44 protrusions, 44a Engagement part, 50 Heat dissipation Member, 51 through hole, 52 heat receiving surface, 53 first heat radiating surface, 54 second heat radiating surface.

Claims (6)

A display panel (10) visible to the occupants of the vehicle and
A circuit board (11) arranged on the back side of the display panel in the viewing direction with respect to the display panel.
A circuit element (12) mounted on the inner surface of the circuit board in the viewing direction and generating heat as it operates.
A metal noise blocking plate (40) arranged so as to cover at least the circuit element from the back side in the viewing direction to block electromagnetic noise, and a noise blocking plate (40).
The noise is arranged between the noise blocking plate and the circuit element, and is generated through the heat receiving surface (52) and the second heat transfer material (40 g) that receive heat from the circuit element via the first heat transfer material (12 g). A heat radiating member (50) having a first heat radiating surface (53) that dissipates heat to the blocking plate and a second heat radiating surface (54) that dissipates heat in the air.
With
The heat radiating member is a display device for vehicles, which is made of metal having a higher thermal conductivity than the noise blocking plate. The heat radiating member has a plate shape that extends along the plate surface of the noise blocking plate.
The vehicle according to claim 1, wherein the second heat radiating surface is provided on the plate surface of the heat radiating member on the same side as the heat receiving surface and is formed in an area larger than the heat receiving surface. Display device. The heat radiating member has a through hole (51) and has a through hole (51).
The noise blocking plate has a protrusion (44) that is inserted into the through hole.
At the tip of the protrusion, an engaging portion (44a) plastically deformed so as to engage with the second heat radiating surface is formed.
The vehicle display device according to claim 2, wherein the heat radiating member is caulked and fixed to the noise blocking plate by the engaging portion. The vehicle display device according to any one of claims 1 to 3, wherein the noise blocking plate is formed with vents (42a, 43a) for flowing the atmosphere of the second heat radiating surface. The vehicle display device according to claim 4, wherein the vents are formed on both sides of the noise blocking plate with the first heat radiating surface interposed therebetween. The vehicle display device according to claim 4 or 5, wherein a wiring (17) connected to the circuit board is inserted and arranged in at least one of the plurality of the vents.

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