JP2015075327A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of preventing a flexible printed circuit-board connected to an FPC connector on a control circuit board arranged at the rear face of a planar display unit from being stained and capable of achieving reduction of an arrangement space and suppression of a dew formation inside the device.SOLUTION: A display device 1 includes a wiring board insertion hole 42 for allowing a flexible printed board 32 extending from an image display unit 31 to be inserted on a control circuit board 4 arranged at a rear side surface side of a substantially plate-like image display unit main body 31. A rear part cover 6 covering a rear surface of the control circuit board 4 includes a concave shaped swollen part 61 in which an interval S2 between the rear surface 4a and the rear part cover 6 is increased more than the surroundings of a wiring board facing region K1 in the wiring board facing region K1 facing a projection part 32a to a side of the rear part cover 6 of the flexible printed board 32.

Description

  In the present invention, a flexible printed circuit board (FPC) extending from a flat display unit is connected to an FPC connector on the back surface of a control circuit board disposed on the rear surface side of the flat display unit, and the control circuit The present invention relates to a display device in which a back surface of a substrate is covered with a rear cover.

FIG. 4 shows a combination meter mounted on a vehicle.
The combination meter 100 displays a plurality of information such as a speedometer 120 that indicates a traveling speed, a tachometer 130 that indicates an engine speed, and a remaining amount of fuel, a gear position, a traveling distance, and the like inside a single dial plate 110. It is a multifunctional instrument device comprising a device 140, a trip knob 150 for resetting the travel distance, a turnlight lighting indicator 160 for turning left, a lighting indicator 170 for turning right light, and the like.

  FIG. 5 shows a schematic structure of a liquid crystal display device 200 used as the display device 140 shown in FIG.

  This liquid crystal display device 200 is a display device disclosed in Patent Document 1 below, and is a liquid crystal display unit 210 that is a flat display unit, and a hard disk that is disposed with a predetermined gap on the rear surface side of the liquid crystal display unit 210. Circuit board 220 for control.

  The liquid crystal display unit 210 is substantially flat and has an image display unit main body 212 whose front surface 211 is an image display surface, and an FPC connector (not shown) on the control circuit board 220 that extends from the image display unit main body 212. Flexible printed circuit board 213.

  The control circuit board 220 is provided with a control circuit for controlling the operation of the liquid crystal display unit 210 on the rigid printed circuit board 221 and an FPC connector for connecting the flexible printed circuit board 213 to the control circuit. It is.

  Although not shown, the control circuit board 220 is equipped with the FPC connector on the back surface that is the surface opposite to the image display unit main body 212. Therefore, the flexible printed circuit board 213 is routed to the back surface side of the control circuit board 220 beyond one side edge side of the control circuit board 220. In order to facilitate the routing of the flexible printed circuit board 213, a notch 223 through which the flexible printed circuit board 213 is inserted is formed on one side edge of the control circuit board 220.

JP 2009-237496 A

  However, in the liquid crystal display device 200 disclosed in Patent Document 1, the flexible printed circuit board 213 is exposed outward from the notch 223, and external equipment is notched when the liquid crystal display device 200 is transported or stored. There is a risk that the flexible printed circuit board 213 may be soiled due to contact with the flexible printed circuit board 213 exposed to the surface.

  Although not shown, generally, the back surface side of the control circuit board 220 around which the flexible printed circuit board 213 is routed is covered with a rear cover. The rear cover secures a gap between the rear cover and the back surface of the control circuit board 220 so that the flexible printed circuit board 213 is not rubbed. However, if the volume of the space defined by the rear cover on the back side of the control circuit board 220 is large, the apparatus becomes large, resulting in an increase in mounting space.

  In addition, when the volume of the space that defines the rear cover on the back side of the control circuit board 220 is large, the atmosphere that accumulates in the apparatus increases, and there is a problem that condensation tends to occur due to moisture contained in the atmosphere.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and is a flexible print that extends from a flat display unit and is connected to an FPC connector on a control circuit board disposed on the back surface of the flat display unit. An object of the present invention is to provide a display device that can prevent a substrate from coming into contact with external equipment, and that can reduce the mounting space and suppress the occurrence of dew condensation in the device.

The above-described object of the present invention is achieved by the following configuration.
(1) A flat display unit comprising an image display unit main body and a flexible printed circuit board extending from the image display unit main body,
A control circuit for controlling the operation of the flat display unit is mounted and disposed on the rear surface side of the image display unit main body, and the flexible printed circuit board is disposed on the back surface opposite to the image display unit main body. The control circuit board equipped with an FPC connector to be connected;
A rear cover covering the back surface of the control circuit board;
A display device comprising:
Equipped with a wiring board insertion hole for inserting the flexible printed circuit board into the control circuit board,
The rear cover has a back surface of the control circuit board in a wiring board facing region facing a protruding portion of the flexible printed board that is inserted through the wiring board insertion hole and connected to the FPC connector toward the rear cover. A display device comprising a bulging portion that is formed in a concave shape in which a gap between the first and second wiring boards is larger than that around the area facing the wiring board and accommodates the protruding portion.

  (2) The display device according to (1), wherein the flat display unit is incorporated in an instrument device mounted on a vehicle and displays a state of the vehicle.

  (3) The display device according to (1) or (2), wherein the flat display unit is a liquid crystal display unit.

  According to the configuration of (1) above, the flexible printed circuit board extended from the flat display unit is guided to the back side of the control circuit board through the wiring board insertion hole provided in the control circuit board. It is connected to the FPC connector mounted on the back surface of the control circuit board. The periphery of the flexible printed board is surrounded by the peripheral edge of the wiring board insertion hole, thereby preventing contact with external equipment. Therefore, it is possible to prevent the flexible printed circuit board from being damaged due to contact with external equipment.

  In addition, the rear cover that covers the back surface of the control circuit board is equipped with a concave-shaped bulging portion that accommodates the protruding portion in a wiring board facing region that faces the protruding portion toward the rear cover side of the flexible printed circuit board. Yes. Therefore, it is possible to prevent the flexible printed board from rubbing against the rear cover.

  In addition, the gap between the area facing the wiring board where the bulging portion is formed and the back surface of the control circuit board is smaller than that of the bulging portion. Therefore, compared with the case where the gap between the rear cover and the back surface of the control circuit board is set uniformly over the entire back surface of the board, the void defined by the rear cover on the back surface side of the control circuit board. The volume of can be reduced. And by reducing this volume, the apparatus can be miniaturized and the mounting space can be reduced. Moreover, since the volume of the atmosphere accumulated in the apparatus is reduced by reducing the volume and the moisture contained in the atmosphere is reduced, it is possible to suppress the occurrence of dew condensation in the apparatus.

  According to the configuration of (2) above, the downsizing of the display device can reduce the size of the instrument device in which the display device is incorporated, thereby improving the ease of assembling the instrument device to the vehicle.

  In addition, since the occurrence of condensation in the display device is suppressed, the occurrence of a failure due to the condensation in the instrument device can be suppressed.

  According to the configuration of (3) above, the flat display unit is a liquid crystal display unit, and can display various types of information on one display screen. Therefore, for example, it is possible to provide a compact and multifunctional instrument device by being incorporated in a vehicle instrument device and displaying various information such as the fuel remaining amount, gear position, and travel distance of the vehicle.

  According to the display device of the present invention, the flexible printed circuit board extending from the flat display unit and connected to the FPC connector on the control circuit board disposed on the back surface of the flat display unit is brought into contact with external equipment. Provided is a display device that can prevent fouling and can reduce the installation space and suppress dew condensation in the device.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a longitudinal sectional view of an embodiment of a display device according to the present invention. FIG. 2 is a perspective view of an assembly in which a flat display unit is assembled to the control circuit board shown in FIG. FIG. 3 is a perspective view of the assembly shown in FIG. 2 viewed from the back side of the control circuit board. FIG. 4 is a front view of a combination meter mounted on a vehicle. FIG. 5 is an exploded perspective view of a conventional example of a display device incorporated in the combination meter of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a display device according to the present invention will be described in detail with reference to the drawings.

  1 to 3 show an embodiment of a display device according to the present invention, FIG. 1 is a longitudinal sectional view of the display device according to an embodiment of the present invention, and FIG. 2 is a control circuit shown in FIG. FIG. 3 is a perspective view of the assembly in which the flat display unit is assembled to the substrate, and FIG. 3 is a perspective view of the assembly shown in FIG. 2 viewed from the back side of the control circuit board.

The display device 1 of this embodiment is used for the display device 140 in the combination meter 100 shown in FIG.
As shown in FIG. 1, the display device 1 of the present embodiment includes a flat display unit 3, a hard control circuit board 4, a device case body 5, and a rear cover 6.

  The flat display unit 3 of the present embodiment is a liquid crystal display unit. The flat display unit 3 according to the present embodiment includes an image display unit main body 31 that is substantially flat and has a front surface 31 a serving as an image display surface, and a flexible printed board 32 that extends from the image display unit main body 31.

  As shown in FIG. 1, on the front side of the image display unit main body 31, a turn-back plate 71, a dial 72, a decorative member 73, a front glass 8, and the like are arranged. The facing plate 71 surrounds the periphery of the front surface 31 a of the image display unit main body 31 to form a design around the flat display unit 3. The dial 72 is a dial for a meter (in the case of the combination meter 100 shown in FIG. 4, a speedometer 120 or a tachometer 130) disposed adjacent to the flat display unit 3. The decorative member 73 is a member that surrounds the dial 72 and forms the design of the outer peripheral portion of the dial 72. The front glass 8 is a transparent glass plate covering the front of the flat display unit 3 and prevents external foreign matter from entering the instrument.

  The flexible printed circuit board 32 is a wiring member that connects the image display unit main body 31 to the control circuit, and extends from one side edge of the image display unit main body 31 as shown in FIGS. The flexible printed circuit board 32 is formed by connecting a plurality of conductor patterns in a planar shape with a resin coating material, and is connected to an FPC connector 41 on a control circuit board 4 described later.

  The flat display unit 3 of the present embodiment is incorporated in the combination meter 100 shown in FIG. 4 and displays a plurality of information indicating the state of the vehicle such as the remaining fuel amount, gear position, and travel distance.

  The control circuit board 4 has a control circuit for controlling the operation of the flat display unit 3 mounted on a hard board (for example, a glass epoxy board). As shown in FIG. It is arranged with a predetermined gap S1 on the rear side.

  In addition, the control circuit board 4 of the present embodiment is equipped with an FPC connector 41 on the back surface 4 a that is the surface opposite to the image display unit main body 31. The FPC connector 41 is a connector for connecting a flexible printed circuit board 32 extending from the image display unit main body 31. As shown in FIG. 1, the FPC connector 41 is provided with a wiring board insertion port for inserting the flexible printed circuit board 32 on an upper end surface 41 a facing the rear cover 6.

  As shown in FIG. 2, the control circuit board 4 of the present embodiment has a flexible printed circuit board 32 at a position P2 on the control circuit board 4 facing the drawing position P1 of the flexible printed circuit board 32 in the flat display unit 3. A wiring board insertion hole 42 is provided for inserting the wiring board. The wiring board insertion hole 42 is a hole elongated in the width direction of the flexible printed circuit board 32 (the direction of the arrow X1 in FIG. 2). The length L 1 of the wiring board insertion hole 42 is set to be larger than the width dimension of the flexible printed circuit board 32.

  The flexible printed circuit board 32 inserted through the wiring board insertion hole 42 is bent into a U shape and connected to the FPC connector 41 as shown in FIG. By such wiring, the flexible printed circuit board 32 forms a U-shaped protruding portion 32a protruding toward the rear cover 6 side.

  The device case body 5 is a resin casing and supports the flat display unit 3 and the control circuit board 4 in a predetermined positional relationship as shown in FIG. The device case body 5 also supports the rear cover 6, the facing plate 71, the dial 72, the decorative member 73, and the front glass 8.

  The rear cover 6 is attached to the device case main body 5 so as to cover the back surface 4 a of the control circuit board 4. The rear cover 6 includes a bulging portion 61 that accommodates a protruding portion 32 a toward the rear cover 6 of the flexible printed circuit board 32 that is inserted into the wiring board insertion hole 42 and connected to the FPC connector 41. The bulging portion 61 is formed by forming a concave shape in the substantially rectangular wiring board facing region K1 of the rear cover 6 facing the flexible printed circuit board 32. The concave shape formed by the bulging portion 61 is a structure in which the gap S2 between the control circuit board 4 and the back surface 4a is larger than the gap S3 between the back surface 4a around the wiring board facing region K1. is there.

  In other words, the gap between the circuit board opposing region K1 and the back surface 4a of the control circuit board 4 is smaller than the circuit board opposing region K1.

  In the display device 1 according to the embodiment described above, the flexible printed circuit board 32 extending from the flat display unit 3 has a wiring board insertion hole 42 provided in the control circuit board 4 as shown in FIG. It is guided to the back surface 4 a side of the control circuit board 4 and connected to the FPC connector 41 mounted on the back surface 4 a of the control circuit board 4.

  The periphery of the flexible printed board 32 is surrounded by the peripheral edge of the wiring board insertion hole 42 to prevent contact with external equipment.

  Therefore, it is possible to prevent the flexible printed circuit board 32 from being damaged due to contact with external equipment.

  The rear cover 6 that covers the back surface 4a of the control circuit board 4 has a concave shape that accommodates the protrusion 32a in the wiring board facing region K1 that faces the protrusion 32a toward the rear cover 6 of the flexible printed circuit board 32. The bulging part 61 is equipped. Therefore, it is possible to prevent the flexible printed circuit board 32 from rubbing against the rear cover 6.

  In addition, the gap S3 between the circuit board opposing region K1 where the bulging portion 61 is formed and the back surface 4a of the control circuit board 4 is smaller than the gap 2 in the bulging portion 61. Therefore, when compared with the case where the gap between the rear cover 6 and the back surface 4a of the control circuit board 4 is set uniformly over the entire back surface 4a of the substrate (that is, when the clearance S2 is set over the entire back surface 4a). The volume of the space defined on the back surface 4a side of the control circuit board 4 by the rear cover 6 can be reduced. And by reducing this volume, the apparatus can be miniaturized and the mounting space can be reduced. Moreover, since the volume of the atmosphere accumulated in the apparatus is reduced by reducing the volume and the moisture contained in the atmosphere is reduced, it is possible to suppress the occurrence of dew condensation in the apparatus.

  In addition, according to the display device 1 of one embodiment, by reducing the size of the display device 1, the instrument device in which the display device 1 is incorporated can be reduced in size, and the assembling property of the instrument device to a vehicle can be improved. Can do.

  Moreover, since generation | occurrence | production of the dew condensation in the display apparatus 1 is suppressed, generation | occurrence | production of the failure resulting from the dew condensation of an instrument apparatus can be suppressed.

  Further, according to the display device 1 of one embodiment, the flat display unit 3 is a liquid crystal display unit, and can display various kinds of information on one display screen. Therefore, for example, it is possible to provide a compact and multifunctional instrument device by being incorporated in a vehicle instrument device and displaying various information such as the fuel remaining amount, gear position, and travel distance of the vehicle.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, the flat display unit only needs to be flat, and is not limited to a liquid crystal display unit. For example, an EL (electro-luminescence) display unit can also be used.

  Moreover, the utilization form of the display apparatus of this invention is not restricted to the form integrated in the combination meter of a vehicle. For example, it can be applied to a display device in a car navigation system.

  Here, the features of the above-described embodiments of the display device according to the present invention will be briefly summarized and listed in the following [1] to [3], respectively.

[1] A flat display unit (3) comprising an image display unit main body (31) and a flexible printed circuit board (32) extending from the image display unit main body (31);
A control circuit for controlling the operation of the flat display unit (3) is mounted and disposed on the rear surface side of the image display unit main body (31), and is a surface opposite to the image display unit main body (31). The control circuit board (4) equipped with the FPC connector (41) connected to the flexible printed circuit board (32) on the back surface (4a),
A rear cover (6) covering the back surface (4a) of the control circuit board (4);
A display device (1) comprising:
The control circuit board (4) is equipped with a wiring board insertion hole (42) for inserting the flexible printed circuit board (32), and
The rear cover (6) is a projecting portion toward the rear cover (6) of the flexible printed circuit board (32) that is connected to the FPC connector (41) through the wiring board insertion hole (42). The gap (S2) between the control circuit board (4) and the back surface (4a) in the wiring board facing area (K1) facing the wiring board 32a) is larger than that around the wiring board facing area (K1). A display device (1) comprising a bulging portion (61) formed in a concave shape and accommodating the protruding portion (32a).

  [2] The display device (1) according to [1], wherein the flat display unit (3) is incorporated in an instrument device mounted on a vehicle and displays a state of the vehicle.

  [3] The display device (1) according to [1] or [2], wherein the flat display unit (3) is a liquid crystal display unit.

1 Display Device 3 Flat Display Unit (Liquid Crystal Display Unit)
4 control circuit board 4a back surface 5 device case main body 6 rear cover 31 image display unit main body 31a front surface 32 flexible printed circuit board 32a protrusion 41 FPC connector 42 wiring board insertion hole 61 bulging portion 100 combination meter (instrument device)
K1 Wiring board facing area S2, S3 Clearance

Claims (3)

A flat display unit comprising: an image display unit main body; and a flexible printed circuit board extending from the image display unit main body;
A control circuit for controlling the operation of the flat display unit is mounted and disposed on the rear surface side of the image display unit main body, and the flexible printed circuit board is disposed on the back surface opposite to the image display unit main body. The control circuit board equipped with an FPC connector to be connected;
A rear cover covering the back surface of the control circuit board;
A display device comprising:
Equipped with a wiring board insertion hole for inserting the flexible printed circuit board into the control circuit board,
The rear cover has a back surface of the control circuit board in a wiring board facing region facing a protruding portion of the flexible printed board that is inserted through the wiring board insertion hole and connected to the FPC connector toward the rear cover. A display device comprising a bulging portion that is formed in a concave shape in which a gap between the first and second wiring boards is larger than that around the area facing the wiring board and accommodates the protruding portion.   The display device according to claim 1, wherein the flat display unit is incorporated in an instrument device mounted on a vehicle and displays a state of the vehicle.   The display device according to claim 1, wherein the flat display unit is a liquid crystal display unit.

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