JP6653063B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device mounted on, for example, an automobile or a motorcycle, and more particularly to a liquid crystal display device having a liquid crystal display electrically connected by using a flexible wiring board.

  As this type of liquid crystal display device, for example, a liquid crystal display device described in Patent Document 1 below is known. This liquid crystal display device includes a transmission type liquid crystal display panel, a holder for supporting the liquid crystal display panel, a panel suppressor for suppressing a peripheral portion of the liquid crystal display panel, and a drive circuit for driving the liquid crystal display panel. A flexible wiring board having one end connected to the liquid crystal display panel and the other end connected to a connector mounted on the back surface of the circuit board.

  Further, such a liquid crystal display device is provided with a guide portion for guiding a flexible wiring board, and the flexible wiring board drawn out of the case body is routed by the guide portion, and then connected to a circuit board, so that an automobile is provided. And a structure to prevent the flexible wiring board from vibrating in a situation where vibration of the construction machine or the like may occur, generating abnormal noise, poor contact, disconnection of the flexible wiring board, and the like. Had become.

JP 2012-153281 A

  However, the liquid crystal display device described in Patent Literature 1 has a structure using a dedicated connection terminal when performing a countermeasure against static electricity by connecting the panel holder to the ground of the flexible wiring board. Therefore, it was necessary to reduce the cost.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a liquid crystal display device capable of taking measures against static electricity without using connection terminals.

  According to the present invention, there is provided a liquid crystal display panel, a holding member for supporting the liquid crystal display panel, a panel holder for suppressing a peripheral portion of the liquid crystal display panel, the liquid crystal display panel and the liquid crystal. A flexible wiring board for electrically connecting a circuit board disposed on the back surface of the display panel, wherein the holding member guides the flexible wiring board to the circuit board. A guide portion having a first inclined portion, wherein the panel holder has a protection portion corresponding to the first inclined portion and having a second inclined portion for covering the flexible wiring board; At the end of the protection portion, an extension formed so as to be parallel to the board surface direction of the circuit board is provided, and a conductive member is disposed between the extension and the circuit board. is there.

  Further, according to the present invention, in a state where the liquid crystal display panel is housed in an upper case and a lower case, and the circuit board is fixed to the upper case from the back side of the liquid crystal display panel, The extension portion and the conductive member are pressed against the circuit board and the upper case to come into contact with the upper case.

Further, according to the present invention, as described in claim 3, a liquid crystal display panel, a holding member for supporting the liquid crystal display panel, a panel holder for suppressing a peripheral portion of the liquid crystal display panel, the liquid crystal display panel, A flexible wiring board for electrically connecting a circuit board disposed on a back surface of the liquid crystal display panel, wherein the holding member guides the flexible wiring board to the circuit board. A guide portion having a first inclined portion to be provided, wherein the panel holder has a protection portion corresponding to the first inclined portion and having a second inclined portion for covering the flexible wiring board. , the end portion of the protective section, an extending length portion which is formed so as to be parallel to the plate surface direction of the circuit board, and a connecting portion connecting the said end portion and the extension portion, is formed, The connecting portion has elasticity with respect to the end portion and the extension portion. , In which the conductive member is disposed between said circuit board and said extension portion.

  Further, according to the present invention, in a state in which the liquid crystal display panel is housed in an upper case and a lower case, and the circuit board is fixed to the upper case from the back side of the liquid crystal display panel, The extension and the conductive member are in contact with each other.

  According to the present invention, it is possible to provide a liquid crystal display device capable of taking measures against static electricity without using a connection terminal.

FIG. 2 is a front view of the middle case of the liquid crystal display device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the liquid crystal display device taken along the line AA according to the first embodiment of the present invention. FIG. 2 is a front view of the panel holder according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the liquid crystal display device according to the first embodiment of the present invention, taken along line BB. FIG. 13 is a sectional view of the liquid crystal display device according to a second embodiment of the present invention, taken along line BB.

A first embodiment of the present invention will be described by taking a liquid crystal display device mounted on a vehicle as an example.
The liquid crystal display device has a rectangular transmissive liquid crystal display panel 1, a light guide plate 2 disposed on the back side of the liquid crystal display panel 1, and a holder as a holding member for supporting the liquid crystal display panel 1 and the light guide plate 2. 3, a hard circuit board 4 disposed on the back of the holder 3, a metal panel retainer 5 for suppressing the periphery of the liquid crystal display panel 1, and an impermeable return member 6 for suppressing the periphery of the panel retainer 5. It has. These components are unitized as a liquid crystal display.

  Further, the liquid crystal display device is covered by a lower case 8 in which the liquid crystal display is accommodated, an upper case 9 covering the opening side of the lower case 8, and a front cover 10 provided in the upper case 9. Note that the double-headed arrows shown in FIG. 2 indicate the upper (front) side and the lower (rear) side described in the present embodiment, and the following description will be made based on the directions indicated by the double-headed arrows.

  In the liquid crystal display panel 1, liquid crystal molecules are sealed between two glass substrates, and for example, a smoke-like polarizing film is attached to each glass substrate. When a signal (voltage) corresponding to an externally measured amount is applied to an electrode unit (not shown) provided on the glass substrate, for example, a liquid crystal display unit (not shown) for displaying the engine speed of the vehicle, the remaining fuel amount, and the like. ) Appear in black.

  The holder 3 is made of, for example, a white synthetic resin, and an FPC guide portion 311 which is a guide portion for guiding an FPC to be described later to the circuit board 4 side is provided on a peripheral wall 31 of the holder 3, and heads toward the circuit board 4. Has a first inclined portion 312 formed so as to be separated from the liquid crystal display panel 1 in accordance with the following.

  Although not shown, the circuit board 4 is provided with control means such as a power supply circuit and a drive circuit for driving the liquid crystal. The liquid crystal display panel 1 and the circuit board 4 are electrically connected by an FPC 19 which is a flexible wiring board. One end of the FPC 19 is fixed to the liquid crystal display panel 1, and the other end is connected to the circuit board 4 using a connector 20.

  The panel restraint 5 is a metallic panel restraint having a frame-shaped edge covering the periphery of the liquid crystal display panel 1, and has an opening window 5 </ b> A through which the liquid crystal display panel 1 can be viewed.

  Further, the panel presser 5 has an FPC protection portion 511 that covers the upper portion of the FPC guide portion 311 at a position corresponding to the FPC guide portion 311, and has an inclination substantially equal to the first inclined portion 312 of the FPC guide portion 311. A second inclined portion 512 is provided.

  As shown in FIGS. 2 and 3, the panel holder 5 has a flange portion 51 extending from the second inclined portion 512 in the board surface direction of the circuit board 4. The flange portion 51 is provided such that a gap is formed between the flange portion 51 and the circuit board 4.

  Further, as shown in FIG. 3, the panel retainer 5 further has extension portions 52 extending from both ends of the flange portion 51 in the board surface direction of the circuit board 4. The extension 52 is provided so as to be in contact with the solder layer 41 which is a conductive member disposed on the circuit board 4. In the present embodiment, the extension portion 52 is formed on the FPC protection portion 511 via the flange portion 51. However, the present invention is not limited to this embodiment. The portion 511 may be provided with the extension 52.

  The facing member 6 is made of, for example, a black synthetic resin, and is provided so as to cover the periphery and the front surface of the panel retainer 5, and the opening 6A through which the liquid crystal display panel 1 can be visually recognized, and the panel retainer around the opening 6A. 5 has an edge portion 61 for suppressing the peripheral edge.

  The upper case 9 has a front panel 10 made of a colorless and transparent synthetic resin, which is disposed on the front side of the liquid crystal display panel 1, and a cover portion 91 and a side wall 92 integrally formed around the front panel 10. I have. The cover 91 and the side wall 92 are made of, for example, black synthetic resin so that the inside of the lower case 8 is not visible. The lower case 8 is made of, for example, a white synthetic resin, and is fixed to the upper case 9 by screws 11 or hooks (not shown).

The upper case 9 has an abutting portion 9a that contacts the circuit board 4 from above.
The liquid crystal display panel 1 is accommodated in the upper case 9 and the lower case 8, and the lower case 8 is fixed together with the circuit board 4 with screws 11 from the back side of the liquid crystal display panel 1, and the extension 52 and the solder layer 41 are provided. Is pressed between the circuit board 4 and the abutting portion 9a of the upper case 9 to come into contact therewith.

  In the liquid crystal display device configured as described above, the FPC 19 passes between the first inclined portion 312 and the second inclined portion 512, and then passes through the gap between the circuit board 4 and the flange portion 51. After passing through, it is routed to the back side of the circuit board 4 and connected to the connector 20.

  When the lower case 8 and the upper case 9 are fixed with screws 11 or the like, the abutting portion 9a of the upper case 9 and the circuit board 4 press the extension portion 52 and the solder layer 41. Since the solder layer 41 is compressed and the extension part 52 and the circuit board 4 are electrically connected, static electricity charged on the liquid crystal display panel 1 can be released to the solder layer 41 and the circuit board 4 via the extension part 52. It becomes possible. In this embodiment, the screws 11 are used as the fixing means between the upper case 9 and the lower case 8 and the fixing means for fixing the circuit board 4 to the upper case 9. However, the fixing means is limited to the screw 11. Instead, it can be arbitrarily selected. Further, in the present embodiment, when the circuit board 4 is fixed to the upper case 9, the lower case 8 is also fixed at the same time. However, it is not necessary to fix the lower case 8 at the same time, and only the circuit board 4 is fixed to the upper case 9. May be fixed.

  As described above, the present invention provides a liquid crystal display panel 1, a holder 3 for supporting the liquid crystal display panel 1, a panel holder 5 for suppressing a peripheral portion of the liquid crystal display panel 1, and a liquid crystal display panel 1 and a liquid crystal display panel 1. And a FPC 19 electrically connecting the circuit board 4 disposed on the rear surface, the holder 3 comprises a guide portion 311 having a first inclined portion 312 for guiding the FPC 19 to the circuit board 4. The panel holder 5 includes an FPC protection section 511 corresponding to the first inclined section 312 and having a second inclined section 512 for covering the FPC 19, and an end of the FPC protective section 511 includes a circuit board. 4 is provided so as to be parallel to the direction of the board surface, and since the solder layer 41 is disposed between the extension 52 and the circuit board 4, dedicated connection terminals are not used. The static electricity charged in the liquid crystal display panel 1, can escape from the extension 52 to the circuit board 4.

  In addition, the present invention is applied to a case where the liquid crystal display panel 1 is housed in the upper case 9 and the lower case 8, and the circuit board 4 is fixed to the upper case 9 from the back side of the liquid crystal display panel 1 by screws 11. The extension 52 and the circuit board 4 can be reliably connected to each other through the solder layer 41 by pressing the solder layer 41 against the circuit board 4 and the upper case 9.

  Next, a second embodiment will be described. The description of the parts common to the first embodiment is omitted.

As shown in FIG. 5, the upper case 9 is not formed with the abutting portion 9a that comes into contact with the circuit board 4 from above.
At the end of the FPC protection part 511, an extension part 52 formed to be parallel to the plate surface direction of the circuit board 4 and a connection part 53 connecting the end part and the extension part 52 are formed. The connecting portion 53 has an inclination with respect to the end of the FPC protecting portion 511 and the extending portion 52 so that the connecting portion 53 has elasticity with respect to the end portion and the extending portion 52. That is, the plate surface direction of the connecting portion 53 has an inclination with respect to the plate surface direction of the end of the FPC protection portion 511 and the plate surface direction of the extension portion 52. Since the connecting portion 53 has an inclination, the connecting portion 53 has elasticity in the up-down direction of the present embodiment.
The liquid crystal display panel 1 is accommodated in the upper case 9 and the lower case 8, and the lower case 8 is fixed together with the circuit board 4 with screws 11 from the back side of the liquid crystal display panel 1, and the extension 52 and the solder layer 41 are provided. And abut.

  In the liquid crystal display device configured as described above, the FPC 19 passes between the first inclined portion 312 and the second inclined portion 512, and then passes through the gap between the circuit board 4 and the flange portion 51. After passing through, it is routed to the back side of the circuit board 4 and connected to the connector 20.

  When the lower case 8 and the upper case 9 are fixed with screws 11 or the like, the connecting portion 53 has an inclination with respect to the extending portion 52, and is bent by the elasticity of the connecting portion 53. And the solder layer 41 are in contact with each other. Since the solder layer 41 is compressed and the extension part 52 and the circuit board 4 are electrically connected, static electricity charged on the liquid crystal display panel 1 can be released to the solder layer 41 and the circuit board 4 via the extension part 52. It becomes possible. In the present embodiment, the connection portion 53 is inclined with respect to the end portion and the extension portion 52 so that the end portion and the extension portion 52 have elasticity. By doing so, the end portion and the extension portion 52 may have elasticity. In this embodiment, the screws 11 are used as the fixing means between the upper case 9 and the lower case 8 and the fixing means for fixing the circuit board 4 to the upper case 9. However, the fixing means is limited to the screw 11. Instead, it can be arbitrarily selected. Further, in the present embodiment, when the circuit board 4 is fixed to the upper case 9, the lower case 8 is also fixed at the same time. However, it is not necessary to fix the lower case 8 at the same time, and only the circuit board 4 is fixed to the upper case 9. May be fixed.

  As described above, the present invention provides a liquid crystal display panel 1, a holder 3 for supporting the liquid crystal display panel 1, a panel holder 5 for suppressing a peripheral portion of the liquid crystal display panel 1, and a liquid crystal display panel 1 and a liquid crystal display panel 1. And a FPC 19 electrically connecting the circuit board 4 disposed on the rear surface, the holder 3 comprises a guide portion 311 having a first inclined portion 312 for guiding the FPC 19 to the circuit board 4. The panel holder 5 includes an FPC protection section 511 corresponding to the first inclined section 312 and having a second inclined section 512 for covering the FPC 19, and an end of the FPC protective section 511 includes a circuit board. 4 and a connecting portion 53 connecting the end portion and the extending portion 52 are formed so as to be parallel to the direction of the board surface. To Since the solder layer 41 is disposed between the extension 52 and the circuit board 4, static electricity charged on the liquid crystal display panel 1 can be removed from the extension 52 without using a dedicated connection terminal. It can escape to the circuit board 4.

  The present invention also provides a liquid crystal display panel 1 housed in an upper case 9 and a lower case 8 and a circuit board 4 fixed to the upper case 9 from the back side of the liquid crystal display panel 1 with an extension 52 and a solder layer. By contacting the extension 41, the extension 52 and the circuit board 4 can be reliably connected via the solder layer 41. Further, in the second embodiment, unlike the first embodiment, it is not necessary to press the extension portion 52 and the circuit board 4 with the abutting portion 9a via the solder layer 41 to make contact with each other. The shape of the case 9 can be simplified.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Light guide plate 3 Holder (holding member)
4 Circuit Board 5 Panel Holder 6 Look Back Member 8 Lower Case 9 Upper Case 10 Front Cover 19 FPC (Flexible Wiring Board)
20 Connector 41 Solder layer (conductive member)
51 Flange part 52 Extension part 53 Connecting part 311 FPC guide part (guide part)
312 First inclined portion 511 FPC protection portion (protection portion)
512 second inclined portion

Claims (4)

A liquid crystal display panel,
A holding member on which the liquid crystal display panel is supported, and a panel holder for suppressing a peripheral portion of the liquid crystal display panel;
A liquid crystal display device, comprising: a flexible wiring board that electrically connects the liquid crystal display panel and a circuit board disposed on a back surface of the liquid crystal display panel;
The holding member includes a guide portion having a first inclined portion for guiding the flexible wiring board to the circuit board,
The panel holder includes a protection portion corresponding to the first inclined portion and having a second inclined portion for covering the flexible wiring board,
At the end of the protection unit, an extension formed to be parallel to the board surface direction of the circuit board is provided, and a conductive member is disposed between the extension and the circuit board. Characteristic liquid crystal display device. In a state where the liquid crystal display panel is housed in an upper case and a lower case, and the circuit board is fixed to the upper case from the back side of the liquid crystal display panel, the extension and the conductive member are connected to the circuit board. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is pressed against the upper case to come into contact therewith. A liquid crystal display panel, a holding member that supports the liquid crystal display panel, and a panel suppressor that suppresses a peripheral portion of the liquid crystal display panel;
A liquid crystal display device, comprising: a flexible wiring board that electrically connects the liquid crystal display panel and a circuit board disposed on a back surface of the liquid crystal display panel;
The holding member includes a guide portion having a first inclined portion for guiding the flexible wiring board to the circuit board,
The panel holder includes a protection portion corresponding to the first inclined portion and having a second inclined portion for covering the flexible wiring board,
Wherein an end portion of the protection portion, an extending length portion which is formed so as to be parallel to the plate surface direction of the circuit board, and a connecting portion connecting the said end portion and the extension portion, is formed, the A liquid crystal display device, wherein the connection portion has elasticity with respect to the end portion and the extension portion, and a conductive member is disposed between the extension portion and the circuit board. The liquid crystal display panel is housed in an upper case and a lower case, and the extension portion and the conductive member are in contact with each other in a state where the circuit board is fixed to the upper case from the back side of the liquid crystal display panel. The liquid crystal display device according to claim 3, wherein:

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