Vehicle display device

Abstract

To provide a vehicle display device capable of suppressing the propagation of noise through an elastic member.SOLUTION: A vehicle display device 10 comprises: a display 50 having a display surface 51a for displaying information; a housing 30 that accommodates the display 50 and has an opening 31; a protective panel member 40 that is formed in a plate shape with light transmittance, and that closes the opening 31 of the housing 30, and has the display surface 51a bonded to its rear surface on the side of an accommodation space Sp of the housing 30; a circuit board 20 that is positioned on a rear surface side of the display 50 and has a ground pattern 21; and an elastic member 70 that is mounted on a surface 20F of the circuit board 20 facing the display 50, and made of a conductive material that presses the display 50. The circuit board 20 has a mounting pattern 22 being a region where the elastic member 70 is mounted, and formed as a conductive pattern different from the ground pattern 21 on the surface 20F at a position apart from the ground pattern 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] The vehicle display device described in Patent Document 1 includes a circuit board on which a light source and a ground terminal are mounted, a partially light-transmitting display panel located on the front side of the circuit board, and a display element for displaying an image located between the circuit board and the display panel. The ground terminal mounted on the circuit board is made of a Z-shaped metallic elastic member, and prevents static electricity charged on the display panel from being applied to the display element by dissipating it to the ground pattern of the circuit board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6837103 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, there is a risk that noise may propagate between the display element and the circuit board via the ground terminal.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and has an object to provide a vehicle display device that can suppress noise propagation via an elastic member. [Means for solving the problem]

[0006] In order to achieve the above object, the vehicle display device according to the present disclosure includes: a display having a display surface for displaying information; a housing that houses the display and has an opening; a protective panel member formed in a translucent plate shape that closes the opening of the housing, the display surface being adhered to a back surface of the housing that faces the storage space; a circuit board located on the rear side of the display and having a ground pattern; an elastic member made of a conductive material mounted on a surface of the circuit board facing the display and pressing against the display; The circuit board has a mounting pattern that is a region where the elastic member is mounted and is formed on the surface at a position away from the ground pattern as a conductive pattern different from the ground pattern. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to suppress noise propagation via an elastic member. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic cross-sectional view of a vehicle display device according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a schematic plan view of a circuit board according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a schematic plan view showing an enlarged view of the periphery of a mounting pattern of a circuit board according to an embodiment of the present disclosure. [Figure 4] 1 is a schematic cross-sectional view showing an enlarged view of the periphery of a mounting pattern of a circuit board according to an embodiment of the present disclosure. [Figure 5] FIG. 10 is a schematic plan view showing an enlarged view of the periphery of a mounting pattern of a circuit board according to a modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] A vehicle display device according to an embodiment of the present disclosure will be described with reference to the drawings. The vehicle display device is mounted on a vehicle, for example, a saddle-type vehicle such as a motorcycle. As shown in FIG. 1, the vehicle display device 10 includes a circuit board 20, a housing 30, a protective panel member 40, a display 50 that displays an image A including vehicle information such as vehicle speed, an adhesive layer 60, and a plurality of elastic members 70. In the following description, the left-right direction is defined as the X direction, the up-down direction as the Y direction, and the front-back direction as the Z direction, based on the viewpoint of the viewer of image A. In the Z direction, the side in front of the viewer is defined as the front side F, and the side behind is defined as the back side B.

[0010] The housing 30 is made of a light-blocking resin or metal, and accommodates the circuit board 20, the display 50, and the elastic member 70 in an accommodation space Sp. The housing 30 is box-shaped and open toward the front side F. The protection panel member 40 is formed in a plate shape from a light-transmitting resin or glass, and is disposed so as to close the opening 31 of the housing 30 .

[0011] The display 50 includes a display panel 51 and a backlight unit 52 . The display panel 51 is a TFT (Thin Film Transistor) type liquid crystal display panel. The display panel 51 displays an image A on a display surface 51a on the front side F under the control of a control element (not shown) on the circuit board 20. The display surface 51a has a rectangular shape that is long in the X direction. The display surface 51a of the display panel 51 is fixed to the back surface of the protection panel member 40 by optical bonding (adhesive layer 60).

[0012] The backlight unit 52 is located on the rear side B of the display panel 51, and illuminates the display panel 51 under the control of a control element (not shown) on the circuit board 20. The backlight unit 52 includes a plurality of LEDs (Light Emitting Diodes) (not shown) as a light source that are arranged in a matrix on the XY plane. In this example, the display 50 is an integrated type in which the display panel 51 and the backlight unit 52 are integrated, but the display 50 may also consist of only the display panel 51, with multiple LEDs arranged on the surface 20F of the circuit board 20 to illuminate the display panel 51.

[0013] The adhesive layer 60 is located between the display surface 51a and the rear surface of the protection panel member 40, and fixes the display surface 51a of the display panel 51 to the rear surface of the protection panel member 40. The adhesive layer 60 is an optically clear adhesive (OCA).

[0014] The circuit board 20 has a front surface 20F and a back surface 20B as mounting surfaces on both the front and back sides. A plurality of mounting elements 27 and an elastic member 70 are mounted on the front surface 20F, and a plurality of mounting elements 27 are mounted on the back surface 20B. The plurality of mounting elements 27 are a CPU (Central Processing Unit), a GDC (Graphics Display Controller), memory, a connecting connector, discrete components, etc. The CPU and GDC are control elements. 2, a ground pattern 21, a mounting pattern 22, and a wiring pattern 23 are formed as copper foil patterns on the front surface 20F of the circuit board 20. The height (length in the Z direction) of the mounting element 27 mounted on the back surface 20B is greater than the height of the mounting element 27 mounted on the front surface 20F. Similarly to the front surface 20F, a ground pattern, a wiring pattern, and the like (neither of which is shown) are formed on the rear surface 20B and an inner layer (not shown) of the circuit board 20.

[0015] The ground pattern 21 is a solid ground that covers the outer periphery of the wiring pattern 23 and the mounting pattern 22. The ground pattern 21 is formed to reduce the influence of external noise and to suppress the emission of noise to the outside.

[0016] The wiring pattern 23 is a current path through which electrical signals transmitted and received between the mounted elements 27 pass.

[0017] Each mounting pattern 22 is arranged on the front surface 20F of the circuit board 20 at each corner of an imaginary rectangle Sq that is substantially similar to the circuit board 20. 3 and 4, each mounting pattern 22 is a land or pad on which an elastic member 70 is mounted. The mounting pattern 22 has a rectangular shape in plan view, and in this example, has a rectangular shape that is long in the Y direction. Note that the elastic member 70 is not shown in FIG.

[0018] A gap C is formed between the outer shape of the mounting pattern 22 and the ground pattern 21 that surrounds the outer periphery of the mounting pattern 22. The gap C is formed over the entire outer periphery of the mounting pattern 22. Due to the gap C, the mounting pattern 22 and the ground pattern 21 are insulated from each other.

[0019] 1, multiple elastic members 70 support the display 50 from the back side and are mounted on each mounting pattern 22 on the front surface 20F of the circuit board 20. Each elastic member 70 is formed as a leaf spring made of a conductive metal material that elastically deforms in the Z direction. Each elastic member 70 is compressed in the Z direction at a position between the back surface of the display 50 and the front surface 20F of the circuit board 20, thereby pressing against the back surface of the display 50. Each elastic member 70 is, for example, an on-board contact (registered trademark). Any type of known on-board contact (registered trademark) can be used as the elastic member 70. For example, the elastic member 70 may be a Z-shaped type that is elastically deformed as a whole, or a type in which a plate spring portion that presses against the back surface of the display 50 is supported by a base portion mounted on the mounting pattern 22. The elastic member 70 may be an Onboard Contact (registered trademark) or a ground foam gasket. This ground foam gasket has an outer skin made of conductive fiber or metal foil, and is filled with polyurethane sponge material, making it an electromagnetic wave shielding material that can simultaneously provide electromagnetic wave shielding and grounding effects. The elastic member 70 is not limited to supporting the rear surface of the display device 50, but may also be configured to support the rear surface of the display panel 51.

[0020] (effect) According to the embodiment described above, the following effects are achieved. The vehicle display device 10 includes a display 50 having a display surface 51a that displays information, a housing 30 that houses the display 50 and has an opening 31, a protective panel member 40 that is formed in a translucent plate shape that closes the opening 31 of the housing 30 and has the display surface 51a adhered to the back surface (the surface of the back side B of the protective panel member 40) of the housing 30 on the housing space Sp side, a circuit board 20 that is located on the back side of the display 50 and has a ground pattern 21, and an elastic member 70 made of a conductive material that is mounted on a surface 20F of the circuit board 20 that faces the display 50 and presses against the display 50. The circuit board 20 has a mounting pattern 22 that is a region where the elastic member 70 is mounted and that is formed on the surface 20F as a conductive pattern different from the ground pattern 21 and at a position away from the ground pattern 21. In a comparative example, in a configuration in which the elastic member is provided on the ground pattern of the circuit board, there is a risk that noise may propagate between the circuit board and the display device via the elastic member. In this regard, the above configuration makes it possible to electrically separate the ground pattern 21 from the mounting pattern 22 on which the elastic member 70 is mounted, thereby suppressing noise propagation between the circuit board 20 and the display 50 via the elastic member 70. This improves noise resistance. Specifically, noise from the display 50 is prevented from propagating to the circuit board 20 via the elastic member 70, and noise from the circuit board 20 is prevented from propagating to the display 50 via the elastic member 70, thereby improving immunity resistance.

[0021] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0022] (Variation) In the above embodiment, the mounting pattern 22 and the ground pattern 21 are insulated from each other by the gap C. However, as shown in Fig. 5, an element insertion space 81 may be formed on the front surface 20F of the circuit board 20 to accommodate an insert element 80 that can electrically connect the mounting pattern 22 and the ground pattern 21. The insert element 80 is, for example, a noise suppression element such as a jumper resistor or a capacitor. The mounting pattern 25 includes a rectangular main body 25a and a current path 25b extending from the main body 25a. The current path 25b has a width shorter than the length of each side of the main body 25a and extends away from the main body 25a. In this example, the current path 25b is formed to extend in the X direction from a corner of the main body 25a. A land 25c is formed at the tip of the current path 25b, far from the main body 25a, to which one end of an insert element 80 can be connected. The other end of the insert element 80 can be connected to a land 21c located on the ground pattern 21. The land 21c is located opposite the land 25c of the ground pattern 21 with a gap C between them. The element insertion space 81 is located between the lands 21c and 25c. Note that at least one of the lands 21c and 25c may be a pad.

[0023] The modified example shown in FIG. 5 provides the following effects. The mounting pattern 25 is surrounded by the ground pattern 21 via a gap C. The circuit board 20 has an element insertion space 81 in which an insert element 80 electrically connected between the mounting pattern 25 and the ground pattern 21 can be installed. According to this configuration, by preparing the element insertion space 81 in advance, it is possible to easily select whether or not to electrically connect the display device 50 and the circuit board 20, and the versatility of the circuit board 20 is enhanced.

[0024] In the above embodiment, the entire outer periphery of the mounting patterns 22, 25 is surrounded by the ground pattern 21 via a gap C, but only a portion of the outer periphery of the mounting patterns 22, 25 may be surrounded by the ground pattern 21 via a gap C. In the above embodiment, the display 50 is not limited to a TFT liquid crystal display panel, but may be an organic EL display device. In the above embodiment, the vehicle display device 10 may be combined with an indicator. In the above embodiment, the adhesive layer 60 can be omitted. In the above embodiment, the protection panel member 40 may be located on the outermost side F of the display 50 as part of the display 50 . In the above embodiment, the vehicle display device 10 may be mounted on a device other than a vehicle, that is, may simply be a display device. [Explanation of symbols]

[0025] 10...Vehicle display device 20...circuit board, 20F...surface, 20B...back surface, 21...ground pattern, 21c, 25c...lands, 22, 25...mounting patterns, 23...wiring pattern, 25a...main body, 25b...current path, 27...mounting element 30...casing, 31...opening 40...Protective panel member 50...display device, 51...display panel, 51a...display surface, 52...backlight unit 60...adhesive layer 70...Elastic member 80...insertion element, 81...element insertion space A...Image, C...Gap, F...Front side, B...Back side, Sp...Storage space, Sq...Rectangle

Claims

1. a display having a display surface for displaying information; a housing that houses the display and has an opening; a protective panel member formed in a translucent plate shape that closes the opening of the housing, the display surface being adhered to a back surface of the housing that faces the storage space; a circuit board located on the rear side of the display and having a ground pattern; an elastic member made of a conductive material mounted on a surface of the circuit board facing the display and pressing against the display; the circuit board has a mounting pattern formed on the surface of the circuit board in a region where the elastic member is mounted, the mounting pattern being a conductive pattern different from the ground pattern and positioned away from the ground pattern; Vehicle display device.

2. the mounting pattern is surrounded by the ground pattern via a gap; the circuit board has an element insertion space in which an insert element electrically connected between the mounting pattern and the ground pattern can be installed. The vehicle display device according to claim 1 .

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