Display, and vehicle display device

Abstract

To provide a display, and a vehicle display device capable of reducing external noise effects on a display panel with a simple structure.SOLUTION: A display 5 is a device that is mounted on a vehicle display device 1 and outputs display light L representing images to be displayed and projected onto a projection target provided outside the vehicle display device 1. The display includes: a display panel 11 that displays images to be displayed based on the light from a light source; a case 10 that supports the display panel 11; and a heat dissipation member 18 that dissipates heat accumulated in the display. A shield case 12 constituting the case 10 and the heat dissipation member 18 are connected to each other.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a display and a vehicle display device.

Background Art

[0002] Conventionally, some vehicles such as automobiles are equipped with vehicle display devices such as a head-up display (HUD). A conventional vehicle display device is configured to project a display image displayed on a display (backlight unit) onto a windshield or a combiner via an optical system such as a reflection mirror, so that the driver can visually recognize it as a virtual image (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a conventional vehicle display device, there is a risk that the display image on the display panel of the backlight unit is disturbed by external noise. As a noise countermeasure, for example, there is a method of flowing noise from the housing (shield case, etc.) of the backlight unit to the control unit by connecting the housing (shield case, etc.) of the backlight unit and the control unit that controls the backlight unit in the vehicle display device. However, in the above method, there are concerns such as the structure of the backlight unit becoming complicated and the design freedom of the vehicle display device decreasing.

[0005] The present invention has been made in view of the above-described situation, and an object thereof is to provide a display and a vehicle display device that can reduce the influence of external noise on the display panel with a simple structure.

Means for Solving the Problem

[0006] In order to achieve the above object, the display according to the present invention is characterized as follows.

[0007] A display that is mounted on a vehicle display device and emits a display image projected onto a projection member provided outside the vehicle display device as display light, A display panel that displays the display image based on light from a light source, A case that supports the display panel, A heat radiating member that radiates heat accumulated in the display, and The shield case constituting the case is connected to the heat radiating member , further comprising a relay member that relays the connection between the display and the control unit of the vehicle display device that controls the display, and also relays the connection between the shield case and the heat dissipation member, The relay member is attached to the outside of the case, connected to the case by a cable and connected to both side ends of the shield case, and further connected to the control unit by a cable. It is a display.

[0008] In order to achieve the above object, the vehicle display device according to the present invention is characterized as follows.

[0009] A vehicle display device provided on an instrument panel of a vehicle, The above display, At least one reflection mirror that is arranged on the optical path of the display light from the display to the projection member and reflects the display light, Before Record control A control unit, and It is a vehicle display device.

Advantages of the Invention

[0010] According to the present invention, by connecting the relay member and the heat dissipation member, noise from the outside flows from the shield case to the relay member, and from the relay member to the heat dissipation member and the control unit. That is, the noise that has flowed from the shield case to the relay member flows not only to the control unit but also to the heat dissipation member, thereby reducing the influence of external noise on the display panel. Further, according to the present invention, it is only necessary to connect the relay member and the heat dissipation member, and the reduction of the influence of external noise on the display panel can be realized with a simple structure. Thus, according to the present invention, it is possible to provide a display device and a vehicle display device that can reduce the influence of external noise on the display panel with a simple structure.

[0011] The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments for carrying out the invention described below (hereinafter referred to as "embodiments") with reference to the accompanying drawings.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0013] <Embodiment> Hereinafter, with reference to the drawings, a vehicle display device 1 and a backlight unit 5 (corresponding to the "display" of the present invention) according to an embodiment of the present invention will be described.

[0014] <Schematic configuration of the vehicle display device 1> Hereinafter, the schematic configuration of the vehicle display device 1 will be described. As shown in FIG. 1, the vehicle display device 1 is, for example, a head-up display device mounted on a vehicle 100 such as an automobile. The vehicle display device 1 is disposed inside the instrument panel 102 in the vehicle 100 and projects a display image onto the windshield 103, which is a projection member.

[0015] Since the windshield 103 has semi-transparency that reflects a part of the incident light and transmits the rest, while transmitting the foreground of the vehicle 100, it reflects the display light L emitted from the vehicle display device 1 as a display image toward the driver's eye point EP. The driver D recognizes the display image reflected by the windshield 103 as a virtual image S. The virtual image S is recognized in front of the windshield 103 with respect to the driver D.

[0016] As shown in FIG. 2, the vehicle display device 1 of the present embodiment includes a housing 2, two reflection mirrors 3, a backlight unit 5, and a control unit 7.

[0017] The housing 2 is formed of, for example, synthetic resin or the like and is fixed to the vehicle body (not shown). As shown in FIG. 2, the housing 2 houses and supports the backlight unit 5, the two reflection mirrors 3, and the control unit 7 in the internal space 2b. The housing 2 has an opening 2a that communicates the outside with the internal space 2b.

[0018] The opening 2a is provided in the housing 2 at a position facing the windshield 103 and is closed by a transparent cover member 6. The cover member 6 transmits the display light L emitted from the backlight unit 5 and reflected by the two reflection mirrors 3. The display light L transmitted through the cover member 6 travels toward the windshield 103.

[0019] As shown in FIG. 2, the two reflection mirrors 3 are arranged on the optical path of the display light L from the backlight unit 5 to the windshield 103, and reflect the display light L emitted from the backlight unit 5 toward the windshield 103. The two reflection mirrors 3 are composed of a plane mirror 8 and a concave mirror 9.

[0020] As shown in FIG. 2, the two reflection mirrors 3 are arranged on the optical path of the display light L from the backlight unit 5 to the windshield 103, and reflect the display light L emitted from the backlight unit 5 toward the windshield 103. The two reflection mirrors 3 are composed of a plane mirror 8 and a concave mirror 9.

[0021] The plane mirror 8 has a reflection surface formed as a plane and is arranged at a position facing the backlight unit 5. The plane mirror 8 totally reflects the display light L emitted from the backlight unit 5 toward the concave mirror 9 with the reflection surface.

[0022] The concave mirror 9 has a reflection surface formed as a concave curved surface and is arranged at a position facing the plane mirror 8. The concave mirror 9 totally reflects the display light L reflected by the plane mirror 8 toward the windshield 103 through the cover member 6. The concave mirror 9 has, for example, a function as a magnifying mirror. The concave mirror 9 magnifies and reflects the display image such that the display image represented by the display light L after being reflected by the concave mirror 9 is relatively larger than the display image represented by the display light L before being reflected by the concave mirror 9.

[0023] The backlight unit 5 is an example of a display and emits a display image to be visually recognized by the driver D of the vehicle 100 as a virtual image S as display light L. A specific description of the backlight unit 5 will be given later.

[0024] As shown in FIG. 2, the control unit 7 is connected to the backlight unit 5 by an arbitrary connecting member (in this example, the cable C) and controls the backlight unit 5. The control unit 7 is composed of, for example, an IC chip mounted on a substrate and is driven by electric power obtained from a battery mounted on the vehicle 100.

[0025] <Schematic Configuration of the Backlight Unit 5 According to the First Embodiment> Hereinafter, the schematic configuration of the backlight unit 5 according to the first embodiment of the present invention will be described. The backlight unit 5 includes a case 10 having a shield case 12 and a backlight case 13, a display panel 11 supported by the case 10, a relay member 17 connected to at least the shield case 12, and a heat dissipation member 18 (see FIG. 3) assembled to the case 10 (in this example, the backlight case 13).

[0026] As shown in FIG. 3, the case 10 is formed, for example, in a box shape and supports the display panel 11 along the optical axis direction. In this example, as described above, the case 10 has a box-shaped backlight case 13 and a shield case 12 assembled to the backlight case 13 in the vicinity of the display panel 11. The backlight case 13 may be made of resin or metal. Also, in this example, the case 10 is composed of two members, but it may be composed of one member. In this case, the case 10 is the backlight case 13 having the function of the "shield case 12". Also, the backlight case 13 may be composed of one or more members.

[0027] The display panel 11 is formed in a rectangular shape as shown in FIG. 3, and displays a display image based on light from a light source (not shown). Specifically, the display panel 11 emits, as display light L, the display image projected onto the windshield 103 by the light incident from the light source. The display panel 11 is a so-called liquid crystal panel, and is composed of, for example, a transmissive or transflective TFT liquid crystal (Thin Film Transistor Liquid Crystal Display).

[0028] The display panel 11 has a display area (not shown in detail) including a plurality of pixels. In the display area, the plurality of pixels are arranged in a matrix. The display panel 11 displays a display image including numbers, characters, figures, etc. according to, for example, the control signal of the control unit 7. The display area is an area where the display image is displayed. The display panel 11 is disposed on the optical path of the light emitted from the light source, and is illuminated from the light source side, so that the display surface on the opposite side of the light source in the optical axis direction emits light.

[0029] The relay member 17 is, for example, a substrate or the like, and as shown in FIG. 3, is connected to, for example, the shield case 12, and is connected to the internal devices of the case 10 (in this example, the backlight case 13) and the display panel 11 by a cable C1 (see FIG. 4) or the like. That is, the relay member 17 has a function of relaying the connection between the backlight unit 5 and the control unit 7. One end of the cable C is connected to the relay member 17, and the other end of the cable C is connected to the control unit 7, whereby the backlight unit 5 and the control unit 7 are connected (see FIGS. 2 and 4). Note that the cables C and C1 may be known cables or FPCs (Flexible printed circuits), and are not particularly limited.

[0030] Further, the relay member 17 is connected to the heat radiating member 18 from the viewpoint of noise countermeasures (this will be described later). In this example, as shown in FIGS. 3 and 4, the relay member 17 and the heat radiating member 18 are connected by a connecting member 19. Note that as the connecting member 19, a lead wire, a cable, a bus bar, an FPC, or the like may be used, and is not particularly limited.

[0031] The heat radiating member 18 is, for example, a heat sink or the like, and as shown in FIG. 3, it is attached to the outside of the case 10 (backlight case 13), for example, and is connected to the relay member 17. The heat radiating member 18 has a function of releasing the heat accumulated in the backlight unit 5 to the outside.

[0032] <Virtual image display operation in the vehicle display device 1> Hereinafter, the virtual image display operation in the vehicle display device 1 will be described. First, in the backlight unit 5 (or the backlight unit 5A described later), the light emitted from the light source is emitted toward the display panel 11 in the same manner as a known backlight unit. The display panel 11 emits the display image displayed in the display area as display light L by the light transmitted through the inside.

[0033] The display light L emitted from the display panel 11 of the backlight unit 5 (or the backlight unit 5A described later) travels toward the plane mirror 8. The plane mirror 8 reflects the display light L incident from the backlight unit 5 toward the concave mirror 9. The concave mirror 9 reflects the display light L incident from the plane mirror 8 toward the windshield 103 through the cover member 6 by the concave reflecting surface. As a result, a display image corresponding to the display light L is projected on the windshield 103, and a virtual image S is displayed in front of the driver D's eye point EP.

[0034] <Noise countermeasures for the backlight unit 5 according to the first embodiment> Hereinafter, the noise countermeasures for the backlight unit 5 will be described. Generally, the backlight unit 5 may have its video on the display panel 11 disturbed by the influence of external noise. Therefore, in this example, the relay member 17 and the heat radiating member 18 are connected by a connecting member 19 (see FIGS. 3 and 4). As a result, as shown in FIG. 4, in the backlight unit 5, external noise flows from the shield case 12 to the relay member 17, and then from the relay member 17 to the heat radiating member 18 and the control unit 7 (see the arrows in FIG. 4).

[0035] That is, according to the present embodiment, the noise flowing from the shield case 12 to the relay member 17 flows not only to the control unit 7 but also to the heat dissipation member 18, thereby reducing the influence of the noise on the display panel 11. Further, the relay member 17 and the heat dissipation member 18 may be connected, and the reduction of the influence of the noise on the display panel 11 can be realized with a simple structure. Thus, according to the present embodiment, the influence of external noise on the display panel 11 can be reduced with a simple structure.

[0036] Furthermore, according to the present embodiment, since noise countermeasures can be taken with the backlight unit 5 alone as described above, an increase in the number of parts can be suppressed without mounting noise countermeasure parts on the vehicle display device 1.

[0037] Furthermore, according to the present embodiment, since an increase in the number of parts can be suppressed as described above, an increase in the size of the backlight unit 5 can be suppressed.

[0038] Furthermore, according to the present embodiment, by providing the relay member 17, in the internal space 2b of the housing 2, it is not necessary to arrange the backlight unit 5 in the vicinity of the control unit 7, and the degree of design freedom in the vehicle display device 1 (particularly, the internal space 2b of the housing 2) is improved.

[0039] (Modification example) As shown in FIG. 5, in the backlight unit 5, the relay member 17 and the heat dissipation member 18 may be directly connected by contact or the like without passing through the connection member 19. In this case, from the viewpoint of noise countermeasures, for example, it is preferable that a mechanism for holding the relay member 17 is provided on the heat dissipation member 18.

[0040] <Schematic configuration of the backlight unit 5A according to the second embodiment> Hereinafter, the schematic configuration of the backlight unit 5A according to the second embodiment of the present invention will be described. The backlight unit 5A includes a case 10A having a shield case 12A and a backlight case 13A, a display panel 11A supported by the case 10A, and a heat radiating member 18A (see FIG. 6) assembled to the backlight case 13A and connected to the shield case 12A.

[0041] As shown in FIG. 6, the case 10A is, for example, formed in a box shape and supports the display panel 11A along the optical axis direction. In this example, as described above, the case 10A has a box-shaped backlight case 13A and a shield case 12A assembled to the backlight case 13A in the vicinity of the display panel 11A. The backlight case 13A may be made of resin or metal. Also, in this example, the case 10A is composed of two members, but it may be composed of one member. In this case, the case 10A is a backlight case 13A having the function of the "shield case 12A". Also, the backlight case 13A may be composed of one or more members.

[0042] As shown in FIG. 6, the display panel 11A is formed in a rectangular shape and displays a display image based on light from a light source (not shown). Specifically, the display panel 11A emits the display image projected onto the windshield 103 as display light L by the light incident from the light source. The display panel 11A is a so-called liquid crystal panel and is composed of, for example, a transmissive or transflective TFT liquid crystal (Thin Film Transistor Liquid Crystal Display).

[0043] The display panel 11A has a display area (not shown in detail) that includes a plurality of pixels. In the display area, the plurality of pixels are arranged in a matrix. The display panel 11A displays a display image including numbers, characters, figures, etc. according to, for example, the control signal of the control unit 7. The display area is an area where the display image is displayed. The display panel 11A is disposed on the optical path of the light emitted from the light source and is illuminated from the light source side, so that the display surface on the opposite side of the light source in the optical axis direction emits light.

[0044] The heat radiating member 18A is, for example, a heat sink or the like, and as shown in FIG. 6, is attached to the outside of the backlight case 13A and is connected to the shield case 12A. The heat radiating member 18A has a function of discharging the heat accumulated in the backlight unit 5A to the outside.

[0045] Note that the internal devices of the case 10A (in this example, the backlight case 13A) are connected to the control unit 7 via a cable C (see FIG. 7), a shield case 12A, etc. That is, one end of the cable C is connected to the shield case 12A (connected to the above internal device and the display panel 11A), and the other end of the cable C is connected to the control unit 7, whereby the backlight unit 5A and the control unit 7 are connected (see FIG. 7). Note that the cable C may be a known cable or an FPC (Flexible printed circuits), and is not particularly limited.

[0046] <Noise countermeasures for the backlight unit 5A according to the second embodiment> Hereinafter, noise countermeasures for the backlight unit 5A will be described. Generally, the display image of the display panel 11A may be disturbed by the influence of external noise in the backlight unit 5A. For this reason, in this example, the shield case 12A and the heat radiating member 18A are connected (see FIG. 7). As a result, as shown in FIG. 7, in the backlight unit 5A, external noise flows from the shield case 12A to the heat radiating member 18A and the control unit 7 (see the arrows in FIG. 7).

[0047] That is, according to the present embodiment, not only from the shield case 12A to the control unit 7, but also noise flows through the heat dissipation member 18A, so that the influence of noise on the display panel 11A can be reduced. Thus, in the present embodiment, the reduction of the influence of noise on the display panel 11A can be realized with a simple structure. That is, according to the present embodiment, the influence of external noise on the display panel 11A can be reduced with a simple structure.

[0048] Furthermore, according to the present embodiment, since noise countermeasures can be taken with the backlight unit 5A alone as described above, an increase in the number of parts can be suppressed without mounting noise countermeasure parts on the vehicle display device 1.

[0049] Furthermore, according to the present embodiment, since an increase in the number of parts can be suppressed as described above, an increase in the size of the backlight unit 5A can be suppressed.

[0050] <Other forms> Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, etc. In addition, the material, shape, dimensions, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

[0051] Here, the features of the embodiments of the display and the vehicle display device according to the present invention described above are briefly summarized and listed in [1] to [5] below.

[0052] [1] A display (backlight unit 5, 5A) mounted on a vehicle display device (1) and emitting a display image projected onto a projection member (windshield 103) provided outside the vehicle display device (1) as display light (L), A display panel (11, 11A) that displays the display image based on light from a light source, A case (10, 10A) that supports the display panel (11, 11A), A heat dissipation member (18, 18A) that dissipates heat accumulated in the display (backlight unit 5, 5A), The shield case (12, 12A) constituting the case (10, 10A) is connected to the heat radiating member (18, 18A). Display (backlight unit 5, 5A).

[0053] [2] The display (backlight unit 5) according to [1] above, further comprising a relay member (17) that relays the connection between the display (backlight unit 5) and the control unit (7) of the vehicle display device (1) that controls the display (backlight unit 5), and also relays the connection between the shield case (12) and the heat radiating member (18). Display (backlight unit 5).

[0054] [3] The display (backlight unit 5) according to [2] above, wherein the relay member (17) and the heat radiating member (18) are connected via a connecting member (19). Display (backlight unit 5).

[0055] [4] The display (backlight unit 5) according to [2] above, wherein the relay member (17) and the heat radiating member (18) are connected in contact with each other. Display (backlight unit 5).

[0056] [5] A vehicle display device (1) provided on an instrument panel (102) of a vehicle (100), comprising the display (backlight unit 5) according to any one of [1] to [4] above, at least one reflection mirror (3) disposed on the optical path of the display light (L) from the display (backlight unit 5, 5A) to the projection member (windshield 103) and reflecting the display light (L), and a control unit (7) for controlling the display (backlight unit 5, 5A). Vehicle display device (1).

[0057] According to the configurations [1] to [5] above, by connecting the relay member and the heat dissipation member, noise from the outside flows from the shield case to the relay member, and from the relay member to the heat dissipation member and the control unit. That is, the noise that has flowed from the shield case to the relay member flows not only to the control unit but also to the heat dissipation member, thereby reducing the influence of external noise on the display panel. Further, according to the present invention, it is only necessary to connect the relay member and the heat dissipation member, and the reduction of the influence of external noise on the display panel can be realized with a simple structure. In this way, the influence of external noise on the display panel can be reduced with a simple structure.

[0058] Furthermore, according to the above configuration, since noise countermeasures can be taken with the display unit alone as described above, an increase in the number of parts can be suppressed without mounting noise countermeasure parts on the vehicle display device.

[0059] Furthermore, according to the above configuration, since an increase in the number of parts can be suppressed as described above, an increase in the size of the display can be suppressed.

[0060] Furthermore, according to the above configuration, by providing the relay member, it is not necessary to arrange the display near the control unit, and the design freedom of the vehicle display device is improved.

Description of reference numerals

[0061] 1 Vehicle display device 2 Housing 3 Reflective mirror 5, 5A Backlight unit (display) 7 Control unit 8 Plane mirror 9 Concave mirror 10, 10A Case 11, 11A Display panel 12, 12A Shield case 13, 13A Backlight case 17 Relay member 18, 18A Heat dissipation member 19 Connection member 100 Vehicle 102 Instrument panel 103 Windshield C Cable C1 Cable D Driver EP Eye point L Display light S Virtual image

Claims

1. A display device mounted on a vehicle display device and emitting a display image projected onto a projection member provided outside the vehicle display device as display light, comprising: a display panel that displays the display image based on light from a light source; a case that supports the display panel; a heat radiating member that radiates heat accumulated in the display device, wherein a shield case constituting the case is connected to the heat radiating member, further comprising a relay member that relays the connection between the display device and a control unit of the vehicle display device that controls the display device and also relays the connection between the shield case and the heat radiating member, wherein the relay member is attached outside the case, connected to the case by a cable and connected to both side ends of the shield case, and further connected to the control unit by a cable, a display device.

2. The display device according to claim 1, wherein the relay member and the heat radiating member are connected via a connecting member. a display device.

3. The display device according to claim 1, wherein the relay member and the heat radiating member are connected in contact with each other. a display device.

4. A vehicle display device provided on an instrument panel of a vehicle, comprising: the display device according to any one of claims 1 to 3; at least one reflection mirror disposed on an optical path of the display light from the display device to the projection member and reflecting the display light; the control unit. a vehicle display device.

Images