JP2018122800A - Vehicle display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle display device provided with a structure which takes action for preventing strain of a resin plate, to which a display is adhered, and a cushioning member from getting caught.SOLUTION: A vehicle display device includes: a display unit 20 having a display panel 21 which displays vehicle information on a display surface 21a, and a metal shield member 211; a display plate 22 adhered to the display surface 21a side of the display unit 20 and having a translucent part 221a which allows a user to visually check the display surface 21a; a circuit board 31 on which control means 31a for controlling the display unit 20 is mounted and which outputs a driving signal to the display panel 21; and a case body 34 which is disposed on the circuit board 31 and supports the display plate 22. The vehicle display device has a conductive elastic member 35 sandwiched between the shield member 211 and a ground electrode of the circuit board 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device for a vehicle, and is suitable for, for example, a vehicle meter provided with a circuit board.

  As disclosed in Patent Document 1, in a vehicle display device having a structure in which a cover plate and a display are bonded with a photo-curing adhesive, vibration caused by the vehicle is prevented, and electromagnetic noise from electronic devices inside and outside the vehicle is prevented. In order to prevent the display output from malfunctioning, the liquid crystal display panel is covered with a shield member, and an elastic and conductive buffer member is sandwiched between the shield member and the circuit board. What is held in place is known.

JP, 2006-37173, A

  However, when a thin resin display plate is applied to the cover plate, the display plate is distorted due to a slight difference in height due to the dimensional variation of the parts, and the appearance of the display plate is deteriorated. Further, since the end surface of the inner wall of the positioning wall has an edge shape, there is a problem that the buffer member is caught or worn.

  Accordingly, an object of the present invention has been made in view of the above problems, and in a display device for a vehicle having a structure in which a thin plate-like resin display plate and a display are bonded, the resin plate is strained and the buffer member is caught or worn. An object of the present invention is to provide a vehicular display device provided with a structure for preventing the above.

  In order to achieve the above object, a display device for a vehicle 1 according to the present invention includes a display unit 20 having a display panel 21 for displaying vehicle information on a display surface 21a and a metal shield member 211, and the display unit 20. A display board 22 having a light-transmitting part 221a that is bonded to the display surface 21a side so that the display surface 21a can be visually recognized, and a control means 31a for controlling the display unit 20 are mounted, and a drive signal is output to the display panel 21 A conductive circuit board 31 disposed between the shield member 211 and the ground electrode of the circuit board 31, and a case body 34 disposed on the circuit board 31 and supporting the display panel 22. It has the characteristic elastic member 35, It is characterized by the above-mentioned.

  The elastic member 35 is made of metal.

  In addition, the elastic member 35 is held at a predetermined position on the circuit board 31, and a positioning wall 343 a having a gap gap H between the shield member 211 or the circuit board 31 in the surface direction of the circuit board 31. It is characterized by having.

  Further, the positioning wall 343a has a chamfered portion 343b for preventing the elastic member 35 from being caught on the end surface of the inner wall.

  The positioning wall 343a is characterized in that the opposite side of the gap H in the surface direction of the circuit board 31 is in contact with the shield member 211 or the circuit board 31.

  The display unit 20 has a boss body 21b protruding toward the circuit board 31, and the gap H is smaller than a gap I between the boss body 21b and the circuit board 31. To do.

  Further, the boss body 21b is located inside the elastic member 35.

  The present invention provides a vehicle display device having a structure in which a thin plate-shaped resin display plate and a display are bonded to each other, and a structure for preventing distortion of the resin plate and catching and abrasion of a buffer member. be able to.

1 is a front view of a vehicle display device according to a first embodiment of the present invention. Sectional drawing along the AA line of the display apparatus for vehicles shown in FIG. FIG. 3 is an exploded view of the vehicle display device shown in FIG. 2 and shows an upper unit. FIG. 3 is an exploded view of the vehicle display device shown in FIG. 2, and shows a display unit. FIG. 3 is an exploded view of the vehicle display device shown in FIG. 2 and shows a circuit board unit. FIG. 3 is an exploded view of the vehicle display device shown in FIG. 2 and shows a container. Sectional drawing which shows the ground connection structure of embodiment same as the above. Sectional drawing which shows the ground connection structure of 2nd Embodiment.

  Embodiments of the present invention will be described with reference to FIGS. 1 to 8, but the present invention is not limited to these embodiments, and various modifications can be made without departing from the present invention.

  The vehicle display device 1 according to the first embodiment has an outer shape shown in FIG. 1 and is configured as an instrument device that is mounted on a vehicle (for example, an automatic four-wheel vehicle) and displays a predetermined measurement amount (vehicle speed or the like). Has been. In the following, in order to facilitate the understanding of the configuration of the vehicle display device 1, the display side of the vehicle display device 1 is “front” and the opposite side is “back” for each member. The members will be described as appropriate (see double-ended arrows in FIG. 2).

  As shown in FIG. 2, the vehicle display device 1 includes an upper unit 10, a display unit 20, a circuit board unit 30, and a container 40. 3 to 6 are diagrams showing the respective configurations 10, 20, 30, 40 before the vehicle display device 1 is assembled as shown in FIG.

(Upper unit 10)
As shown in FIGS. 2 and 3, the upper unit 10 includes a turning member 11 and a transmission panel 12.

  The facing member 11 is made of an impermeable synthetic resin such as black PP (polypropylene) resin, and is formed into a cylindrical shape as shown in FIGS. The display surface 21a and the warning display part 221c are exposed, and other required areas are concealed. Further, the facing member 11 is fixed by sandwiching the dial plate 22 and the case body 34 with the storage body 40, and the facing locking piece 11 b is locked to the storage body protrusion 44 b of the storage body 40. The embossed surface of the upright wall 11a prevents the reflection of illumination from the display surface 21a and the warning display unit 221c.

  The transmission panel 12 is made of a transparent synthetic resin such as transparent PMMA (acrylic) resin, and the transmission panel locking pieces 12a are locked to the facing projections 11c of the facing member 11 as shown in FIGS. It is fixed and covers the front.

(Display unit 20)
As shown in FIGS. 2 and 4, the display unit 20 includes a display 21, a dial plate 22, and a translucent layer 23.

  The display device 21 includes, for example, a TFT (Thin Film Transistor) type liquid crystal display (LCD), and displays an image for informing a predetermined measurement amount (for example, vehicle speed) on the display surface 21a. . In the first embodiment, a general-purpose modularized liquid crystal display is adopted as the display 21. The display 21 protrudes toward the back side, and four metals that require screw holes (not shown). The boss body 21b (FIGS. 2 and 4) is made. The display device 21 may be an organic EL display (OELD: Organic Electro Luminescence Display).

  The display 21 is provided with a metallic plate-like shield member 211 and a circuit board 212 on the back surface. The shield member 211 is provided so as to cover the back surface of the display unit 21 so that static electricity or noise can be guided to the ground so as not to adversely affect the surrounding electronic components by being grounded through a conductive path described later. . The display 21 has a drive circuit for a liquid crystal display and a backlight, and the heat generated by these electronic components can be expected to be transferred or radiated by the shield member 211. The circuit board 212 is formed with a wiring pattern for transmitting a TFT drive signal.

  The dial plate 22 is located on the front side of the display device 21 and includes a transparent plate 220 and a light shielding portion 221.

  The transparent plate 220 is made of a translucent resin such as a transparent PC (polycarbonate) resin, for example, and is formed in a thin flat plate shape having a thickness of about 0.5 mm. The light shielding part 221 is made of a light shielding printing layer formed on the back surface of the transparent plate 220. On the back surface of the transparent plate 220, there is a portion where the light shielding portion 221 is not formed, and a window portion 221 a that allows the display surface 21 a of the display device 21 to be seen through is formed by the portion.

  In addition, a warning display unit 221c including icons, symbols, and the like for notifying predetermined warning information in a so-called extracted character shape is formed in a part of the light shielding unit 221. That is, a part of the warning display part 221c has translucency. As shown in FIG. 1, the window part 221a is formed in a rectangular shape, and the warning display part 221c is located on both sides of the window part 221a.

  A black double-sided adhesive tape 22 a is attached to the back side of the light shielding portion 221 of the dial plate 22. The double-sided adhesive tape 22 a comes into contact with the front end portion of the case body 34. With this configuration, even if the display 21 vibrates, the dial 22 is prevented from floating from the case body 34, and distortion generated in the dial 22 is reduced.

  The translucent layer 23 is made of a transparent optical adhesive (OCA) sheet, and is overlapped and adhered between the back surface of the dial 22 and the display surface 21a of the display 21 without any gap. Yes.

(Circuit board unit 30)
2 and 5, the circuit board unit 30 includes a first circuit board 31 (circuit board), a second circuit board 32, a case body 34 that holds these circuit boards, and a coil spring 35 (elastic member). And). The first and second circuit boards 31 and 32 are each composed of a printed circuit board in which various electronic components are mounted on a board on which printed wiring is formed.

  The first circuit board 31 is located on the back side of the display 21 and is electrically connected to the display 21. Specifically, a connector (not shown) is mounted on the back surface of the first circuit board 31, and this connector and a flexible substrate (not shown) provided on the back surface side of the display 21. Thus, the first circuit board 31 and the display 21 are electrically connected. As the flexible board, for example, a flexible printed circuit (FPC) or a flexible flat cable (FFC) can be applied. In this case, the first circuit board 31 and the circuit board 212 are connected to each other. ing.

  As shown in FIG. 2, a light source 31 b that illuminates the warning display unit 221 c is mounted on the front side of the first circuit board 31. The light source 31b is formed of, for example, a light emitting diode (LED), is provided at a position facing the warning display unit 221c in the front and back direction of the vehicle display device 1, and emits light toward the front side.

  The first circuit board 31 is mounted with control means 31a (drive control circuit such as a microcomputer) for controlling the operation of the vehicle display device 1 (for example, mounted on the back side of the board). The control means 31a is electrically connected to an ECU (Electronic Control Unit) (not shown) of the vehicle, and an image showing the vehicle speed and the like on the display 21 based on various information about the vehicle acquired from the ECU. Is displayed. Further, for example, the light source 31b also performs a light emission operation under the control of the control means 31a.

  The second circuit board 32 is located on the back side of the first circuit board 31 and is electrically connected to the first circuit board 31. Specifically, a connector (not shown) mounted on the back side of the first circuit board 31 and a connector (not shown) mounted on the front side of the second circuit board 32 are connected to each other. Are electrically connected.

  In addition to various electronic components, the second circuit board 32 is mounted with an external connection connector (not shown) that is exposed to the back side of the housing 40 and connects the vehicle display device 1 to the outside. ing. The connector for external connection is mounted on the back side of the second circuit board 32, and the opening of the container 40 (not shown) provided on the bottom 41 (FIGS. 2 and 6) of the display device 1 for the vehicle. Exposed outside. With this external connection connector, the vehicular display device 1 can be connected to an external device such as an ECU.

  The case body 34 is made opaque from a resin such as white PP, and holds the first and second circuit boards 31 and 32. Specifically, as shown in FIGS. 2 and 5, the first circuit board 31 is fixed to the case body 34 from the back side by fixing means such as a screw S1. The second circuit board 32 is formed on the case body 34, and is fixed to the case body 34 by a fixing means such as a screw S2 on a boss body 341 protruding toward the back side. The boss body 341 passes from the front side of the first circuit board 31 to the back side through the opening 310 formed in the board of the first circuit board 31. The second circuit board 32 fixed to the boss body 341 is located on the back side of the first circuit board 31. In this way, the first and second circuit boards 31 and 32 are fixed (held) to the case body 34.

  The case body 34 includes a recess 343 that houses the display 21 and a light guide 344 that guides light emitted from the light source 31 b to the dial 22. As shown in FIG. 2, the concave portion 343 is formed in a concave shape, covers the display device 21 from the back side, and houses the display device 21 so as to substantially surround a portion other than the display surface 21 a. In the normal direction of the display surface 21a, a gap G is formed between the display 21 and the recess 343, and the display 21 and the recess 343 do not contact each other. Therefore, the display 21 is supported in a suspended manner on the dial 22 via the light transmitting layer 23.

  As shown in FIG. 2, the light guide 344 is a cylindrical portion formed adjacent to the concave portion 343, and reflects and guides the light emitted from the light source 31b to the dial plate 22 side. For example, the light guide 344 is formed so as to surround a line connecting the light source 31b and the warning display unit 221c located on the front side thereof. The light emitted from the light source 31b reaches the dial plate 22 while being efficiently reflected by the inner surface of the light guide 344 thus formed, and illuminates and emits the warning display portion 221c.

  The case body 34 includes a side wall portion 345 and a flange portion 346. The side wall portion 345 is a wall portion having a surface facing the outer peripheral side of the case body 34. The side wall 345 is formed with a plurality of heat radiation holes (not shown) for releasing heat generated from the indicator 21 during operation.

  The flange portion 346 is a portion that is formed so as to protrude from the front side end portion of the side wall portion 345 toward the outer peripheral side of the case body 34, and is fitted into a later-described stepped portion 44 a formed in the housing body 40. . Thereby, the case body 34 is arrange | positioned so that it may be mounted in the container 40 from the front side.

  The coil spring 35 is a compression coil spring made of metal such as stainless steel, and the coil spring 35 is provided between the display 21 and the first circuit board 31 as shown in FIGS. In addition, the coil spring 35 can hold an approximate position in the surface direction of the first circuit board 31 by a positioning wall 343 a formed in the recess 343.

  In addition, the coil spring 35 can be kept in contact with the display 21 and the first circuit board 31 by compressing and deforming, so that the conductive state between the shield member 211 and the ground electrode of the first circuit board 31 is maintained. Can keep. It is desirable that the display 21 is provided in a suspended manner as described above, or is brought into contact with a tension that is small enough not to lift the dial 22 and lift it, and is usually difficult to design. The compression coil spring is easy to design because the load-deflection characteristic is linear. In addition, not only stainless steel but metals, such as a copper alloy which is more excellent in an electrical property, can also be applied. Further, not only the coil spring 35 but also a hollow synthetic rubber can be used instead.

  The positioning wall 343 a has an inner diameter slightly larger than the outer diameter of the coil spring 35. Even if the display 21 and the first circuit board 31 have different movements due to external pressure or thermal deformation, the coil spring 35 is stretched and deformed by the gap between the coil spring 35 and the positioning wall 343a. Since it is easy, the conductive state can be maintained without applying an extra pressing load on the display 21 or the like.

  As shown in FIGS. 2 and 6, the container 40 is formed from a resin such as black ABS (acrylonitrile butadiene styrene) with light shielding properties. Moreover, the container 40 has the bottom part 41 mentioned above and the wall part 42 which stands toward the front side from the edge part of the bottom part 41, and is formed in the box shape opened toward the front side. That is, the container 40 has an opening 43 surrounded by the front side end of the wall 42. The circuit board unit 30 is arranged inside the container 40 formed in this way.

  Further, a protruding portion 44 that protrudes to the outer peripheral side of the opening 43 is provided at the front end portion of the wall portion 42. A step 44 a surrounding the opening 43 is formed on the opening 43 side of the protrusion 44. The case body 34 is disposed in the housing body 40 by fitting the housing protrusion 44b provided on the outer surface of the stepped portion 44a into the turn-off locking piece 11b. In this way, the circuit board unit 30 is located inside the container 40.

  Such a vehicle display device 1 is mounted with a display unit 20 having a display 21 for displaying vehicle information and a shield member 211, and a control means 31a for controlling the display unit 20, and a drive signal is sent to the display panel 20. A first circuit board 31 for output, and the shield member 211 is grounded by sandwiching a coil spring 35 between the shield member 211 and the ground electrode of the first circuit board 31.

  Therefore, in order to obtain the grounding structure of the shield member 211, it is only necessary to place the shield member 211 on the positioning wall 343a. In addition, even if the vehicle vibrates, the grounded state can be maintained by the elastic coil spring 35, so that adverse effects due to noise can be prevented. Further, in this case, since the control means 31a is provided between the ground electrode (grounded copper foil pattern) of the first circuit board 31 and the grounded shield member 211, the display is performed in a state where the influence of noise is reduced. The device 21 can be driven. Further, the heat generated by the display 21 is transmitted from the shield member 211 to the coil spring 35 and is transferred to the first circuit board 31 side to be dissipated, thereby preventing the electronic components from being damaged due to a local temperature rise.

  A positioning wall 343 a is provided so that the coil spring 35 is held at a predetermined position on the first circuit board 31, and the positioning wall 343 a and the shield member 211 have a gap H in the surface direction of the first circuit board 31. Therefore, the conductive state can be maintained without applying an extra pressing load to the display 21 or the like by the positioning wall 343a.

  As shown in FIG. 7, for example, when the inner wall end surface of the positioning wall 343 a is a broken edge shape portion 343 c, when the coil spring 35 is inclined during assembly or due to vibration of the vehicle, the coil spring is applied to the edge shape portion 343 c. 35 is caught, and a part of the coil spring 35 is sandwiched between the positioning wall 343 a and the shield member 211. As a result, there is a possibility that the coil spring 35 may be separated from the first circuit board 31 and cannot maintain a conductive state, or the display device 21 cannot be held with an appropriate tension. Further, when the coil spring 35 is made of rubber, there is a possibility that the rubber is worn by the edge shape portion 343c.

  Therefore, by having the chamfered portion 343b having an inclined shape on the end surface of the inner wall of the positioning wall 343a, the coil spring 35 can be prevented from being caught, and the normal state can always be maintained. The chamfered portion 343b may have a curved surface shape.

  Conventionally, in the specification in which the dial plate 22 and the display unit 21 are not bonded and fixed, the display unit 21 grounds the boss body 21b to the first circuit board 31 and is fixed from the back side of the first circuit board 31 with screws (not shown). The display 21 was fixed and grounded. The display device 21 of the present embodiment has a boss body 21b because the display device 21 having such specifications is used. However, when the display 21 attempts to move to the back side due to vehicle vibration or the like, there is a possibility that abnormal noise may be generated when the metal boss body 21 b contacts the first circuit board 31.

  Therefore, a gap I that is slightly larger than the gap H is provided between the boss body 21 b and the first circuit board 31. Thereby, before the boss | hub body 21b contacts the 1st circuit board 31, since the indicator 21 contacts the positioning wall 343a, abnormal noise can be prevented. Since the positioning wall 343a is made of resin, the noise with the display 21 can be made small enough to be ignored.

  Further, since the positioning wall 343a is in contact with the first circuit board 31 side, the positioning wall 343a serves as a stopper even if the indicator 21 tries to move to the back side due to vehicle vibration or the like, and the dial 22 and the indicator It is possible to prevent an excessive peeling force from being generated on the bonding surface 21.

  In the second embodiment of the present invention, as shown in FIG. 8, the boss body 21 b is positioned inside the coil spring 35. As a result, the boss body 21b can serve as a guide rod for the coil spring 35, and the coil spring 35 is less likely to be inclined obliquely due to vehicle vibration or the like. Furthermore, since the grounding surface of the coil spring 35 of the first circuit board 31 is not necessary, the space of the first circuit board 31 below the boss body 21b can be used effectively, and the mounting area can be increased.

  In addition, the inclined wall-shaped chamfered portion 343d is provided on the end surface of the inner wall of the positioning wall 343a that is in contact with the first circuit board 31, so that the vibration between the bottom wall of the positioning wall 343a and the first circuit board 31 is caused by the vibration of the vehicle. Even when a gap is generated, the coil spring 35 can be prevented from being caught.

  In addition, although the display apparatus 1 for vehicles of this invention was mentioned as an example in the structure of embodiment mentioned above, this invention is not limited to this, The summary of this invention is also in another structure. It goes without saying that various improvements and design changes can be made without departing from the scope of the invention.

  The present invention relates to a display device for a vehicle, and can be applied to, for example, a vehicle instrument mounted on a moving body including an automobile, a motorcycle, an agricultural machine, or a construction machine.

20 Display Unit 21 Display Panel 21a Display Surface 211 Shield Member 21b Boss Body 22 Display Board (Dial Plate)
221a Translucent part (window part)
31 Circuit board (first circuit board)
31a Control means 34 Case body 343a Positioning wall 343b Chamfer 35 Coil spring (elastic member)
H Gap I I Gap (Gap)

Claims (7)

A display unit having a display panel for displaying vehicle information on a display surface and a metal shield member;
A display plate having a translucent portion that is bonded to the display surface side of the display unit and makes the display surface visible;
A circuit board for mounting a control means for controlling the display unit and outputting a drive signal to the display panel;
A case body disposed on the circuit board and supporting the display board;
With
A vehicular display device comprising a conductive elastic member sandwiched between the shield member and a ground electrode of the circuit board.   The vehicle display device according to claim 1, wherein the elastic member is made of metal.   The elastic member is held at a predetermined position on the circuit board, and has a positioning wall having a gap portion between the shield member and the circuit board in the surface direction of the circuit board. The vehicle display device according to any one of 2.   The vehicular display device according to claim 3, wherein the positioning wall has a chamfered portion that prevents the elastic member from being caught on an end surface of the inner wall.   5. The vehicle display device according to claim 3, wherein the positioning wall is in contact with the shield member or the circuit board on the opposite side of the gap in the surface direction of the circuit board. .   6. The display unit according to claim 3, wherein the display unit has a boss body protruding toward the circuit board, and the gap portion is smaller than a gap between the boss body and the circuit board. The vehicle display device described in 1.   The vehicle display device according to claim 6, wherein the boss body is positioned inside the elastic member.

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