JP2019006171A - Display device - Google Patents

Abstract

To provide a display device that is free from erroneous operation of an information display body.SOLUTION: A display device comprises: a display unit 10 having an information display body 11 for displaying specific information, and a conductive frame body 16 accommodating the information display body 11; a circuit board 20 disposed on a rear side of this display unit 10; a conductive member 18 configured such that one-end side X1 of which is connectable with a rear-face frame 15 (a frame body 16); and a wiring cord 50 one-end part Y1 of which is connectable with a ground part 23 of the circuit board 20. The other-end side X2 of the conductive member 18, which is opposite the one-end side X1, abuts on the other-end part Y2 of the wiring code 50, which is opposite the one-end part Y1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device mounted on various vehicles such as automobiles and construction machines.

  Conventionally, as this type of display device, for example, the one described in Patent Document 1 below is known. The display device disclosed in Patent Document 1 includes an information display body including a liquid crystal display panel that displays predetermined information (for example, vehicle speed information), a hard circuit board disposed behind the information display body, and an information display. The circuit board is mainly composed of a body and a resin casing for housing the circuit board, and a control unit made up of a microcomputer for controlling the display of the information display body is mounted on the circuit board.

JP 2011-111056 A

Incidentally, in addition to the display device described above, an electronic device (for example, an audio device) is mounted on the vehicle in the vicinity of the display device. Usually, an audio device generates electromagnetic noise during operation, and the electromagnetic noise propagates to the surroundings. Therefore, the liquid crystal display panel (information display body) provided in the display device may malfunction due to the influence of electromagnetic noise propagated around the audio device.
SUMMARY OF THE INVENTION In order to address the above-described problems, an object of the present invention is to provide a display device that does not cause a malfunction of an information display body.

  The present invention provides a display unit having an information display body for displaying predetermined information and a conductive frame body for housing the information display body, and a counter-viewer side opposite to the viewer side of the display unit. A circuit board to be disposed; a conductive member configured to be connectable to the frame body at one end thereof; and a wiring member configured to be connectable to a grounding portion of the circuit board at one end. The other end of the conductive member opposite to the one end is in contact with the other end of the wiring member opposite to the one end.

Further, in the present invention, the display unit includes a resin member having a main body portion housed inside the frame body and a fixing portion that protrudes outside the frame body,
The other end side of the conductive member and the other end portion of the wiring member are fastened and fixed to the fixing portion by screws.

  According to the present invention, it is possible to provide a display device that can achieve the intended purpose and does not cause the information display body to malfunction.

1 is a front view of a display device according to an embodiment of the present invention. AA sectional drawing of FIG. The principal part expanded sectional view which expands and shows the principal part of a display apparatus in FIG.

  Hereinafter, a case where the embodiment of the present invention is applied to a display device mounted on a vehicle such as a construction machine will be described as an example with reference to FIGS. In the following description, the viewer side viewing (displaying) the display device is regarded as the front side, and the counter-viewer side opposite to the viewer side is defined as the back side.

  1 and 2, the display device D according to the present embodiment includes a display unit 10, a circuit board 20 disposed on the back side of the display unit 10, and a translucency disposed on the front side of the display unit 10. Protective panel 30, a casing 40 constituting an outer case of the display device D, and a wiring cord 50 as a wiring member (electric wire).

  As shown in FIG. 2, the display unit 10 includes a display element 11 as an information display, a source line driving circuit (not shown) that drives a source line (signal line) of the display element 11, A illuminating means 12 for guiding illuminating light to the display element 11 includes a gate line driving circuit (not shown) for driving gate lines (scanning lines), a light guide 12a, a light source 12b, a flexible wiring board 12c, and the like. And a resin case (resin member) 13 having a main body 13a for holding the display element 11 and the light guide 12a, a front frame 14 and a back frame 15, and forming a conductive case constituting the exterior case of the display unit 10. A timing controller (not shown) that generates various timing signals for controlling the timing of the frame body 16, the source line driving circuit, and the gate line driving circuit, etc. And a printed circuit board 17 which is mounting.

  In this case, the metal frame body 16 composed of the front frame 14 and the rear frame 15 paired with the front frame 14 includes a display element 11, a light guide body 12 a, a light source 12 b, and a main body. 13a etc. are accommodated (accommodated), and the printed circuit board 17 is fixed to the back surface of the bottom surface portion (described later) of the back frame 15 using an appropriate fixing means.

  If necessary, one or more optical members (for example, a diffusion sheet or a prism sheet) for illuminating the display element 11 with substantially uniform backlight may be disposed between the display element 11 and the light guide 12a. Good.

  The display element 11 is composed of, for example, a TFT-type liquid crystal display element having a plurality of pixels, and vehicle information (predetermined information) such as vehicle speed, fuel consumption, and outside temperature based on detection signals from various sensors mounted on the vehicle. Is displayed (see FIG. 1). The display unit 11 a is displayed in a display area (not shown) of the display element 11.

  The light guide 12 a is made of a substantially flat transparent translucent resin and is disposed along the back surface of the display element 11. In other words, the light guide 12a is arranged in the illumination optical path from the light source 12b to the display element 11.

  The light sources 12b are formed of chip-type light emitting diodes that emit colors as appropriate. In FIG. 2, a plurality of light sources 12b are arranged in a line along one side surface 12d located on the right side of the light guide 12a. It consists of the luminous body to supply.

  The resin case 13 is formed of, for example, a white synthetic resin material, and has a substantially flat body portion 13a housed inside the frame body 16 so as to hold the display element 11 and the light guide body 12a, and the bottom surface portion. And a fixing portion 13b exposed (protruded) from the hole H to the rear side of the back frame 15.

  That is, the fixing portion 13b (integrally formed with the main body portion 13a) here is a substantially cylindrical boss portion that is configured to protrude outside the frame body 16, and a screw 60 is provided on the inner peripheral surface thereof. A screwing portion (not shown) to be screwed is provided.

  The front frame 14 is made of a conductive material and is press-molded in a substantially frame shape. The front frame 14a is a main portion of the front frame 14 and the first peripheral wall 14b is formed to hang downward from the periphery of the front surface 14a. And are integrally formed. A display window portion 14c including a substantially rectangular opening window is formed at a substantially central portion of the front surface portion 14a so as to correspond to the display portion 11a.

  The back frame 15 is made of a conductive material like the front frame 14, and is formed in a substantially concave shape in cross section. The bottom surface 15a forms the main part of the back frame 15 and the first peripheral wall 14b side from the periphery of the bottom surface 15a. And a second peripheral wall portion 15b that protrudes toward the surface.

  In FIG. 2, a flexible wiring board 12c is appropriately fixed to the inner wall surface 15c of the second peripheral wall portion 15b located on the right side by using a fixing means, and each light source 12b is provided on one side surface 12d of the light guide 12a. It is mounted on a conductive path (not shown) provided in the flexible wiring board 12c so as to face.

  In FIG. 2, reference numeral 17 a denotes a first connector mounted on the printed circuit board 17, and the first connector 17 a and the second connector 21 mounted on the circuit board 20 are other flexible wiring boards F. Is connected by conduction.

  Reference numeral 18 denotes a conductive member formed of, for example, a thin metal plate. The conductive member 18 has a structure in which a substantially central portion thereof is bent, and includes a first flat plate portion 18a and a second flat plate portion 18a. Plate portion 18b and bent portion 18c (see FIG. 3).

  The first flat plate portion 18a is located on the one end side X1 of the conductive member 18, and is fixed to the bottom surface portion 15a of the back frame 15 by using an appropriate fixing means. That is, this means that the one end side X1 (first flat plate portion 18a) of the conductive member 18 is configured to be connectable to the back frame 15 (frame body 16).

  The 2nd flat plate part 18b is located in the other end side X2 of the electrically-conductive member 18 on the opposite side to the said one end side X1, and is provided in the back side rather than the formation position of the 1st flat plate part 18a. Yes. The second flat plate portion 18b is fixed to the fixing portion 13b by a screw 60. The bent portion 18c is formed as an inclined wall portion that connects the first flat plate portion 18a and the second flat plate portion 18b.

  The circuit board 20 is made of, for example, a hard wiring board having predetermined conductive paths on the front and back surfaces thereof, a control unit 22 made of a microcomputer that performs display control of the display element 11 and lighting control of the light source 12b, a resistor, Various circuit components such as a capacitor are conductively connected on the conductive path. Reference numeral 23 denotes a grounding portion as a ground electrode provided on the conductive path on the back surface of the circuit board 20, and a first terminal (to be described later) of the wiring cord 50 is connected to the grounding portion 23.

  The protection panel 30 is a substantially flat see-through portion formed of a light-transmitting synthetic resin material. In addition, a light shielding layer 31 that is a non-transmissive portion is formed by printing or the like on the back surface portion of the protective panel 30 excluding the display area. In this case, the protective panel 30 is fixed to the display unit 10 using an adhesive 70 such as a light-transmitting double-sided tape.

  The housing 40 is a resin housing formed of, for example, a synthetic resin material, and the display unit 10, the circuit board 20, and the protection panel 30 are accommodated in the internal space. An opening 41 a is formed in the front wall 41 of the housing 40 so that a required portion of the protective panel 30 can face. Note that the housing 40 may be divided into two so as to have a front housing located on the front side of the display device D and a rear housing located on the back side of the display device D, for example. Good.

  The wiring cord 50 is configured by caulking a pair of first and second terminals 52 and 53 to both ends of a flexible cord body 51. In this case, of the pair of first and second terminals 52 and 53, the first terminal 52 is located at one end Y1 of the wiring cord 50, and the second terminal 53 is defined as one end Y1. It is assumed that it is located at the other end Y2 of the wiring cord 50 on the opposite side.

  The first terminal 52 (that is, the one end Y1 of the wiring cord 50) is connected to the grounding portion 23 by being fixed to the grounding portion 23 provided on the circuit board 20 with a fixing screw (not shown). It becomes. That is, this means that the wiring cord 50 is configured such that one end portion Y1 thereof can be electrically connected to the grounding portion 23 of the circuit board 20.

  Further, as shown in FIG. 2, the other end Y2 of the wiring cord 50 opposite to the one end Y1 and the other end X2 (second flat plate portion 18b) of the conductive member 18 are fixed by a screw 60. It becomes the structure fastened together by 13b. When the other end portion Y2 of the wiring cord 50 and the other end side X2 of the conductive member 18 are fastened to the fixing portion 13b, the other end side X2 of the conductive member 18 is connected to the other end portion Y2 of the wiring cord 50. Needless to say, they are in contact (surface contact).

  Here, when the display device D is affected by electromagnetic noise that propagates around the audio device under the condition that the audio device (electronic device) is mounted around the display device D, The electromagnetic noise is caused by the conductive frame body 16, the conductive member 18 fixed to the bottom surface portion 15a of the back frame 15 (frame body 16), and the wiring cord 50 in contact with the conductive member 18 (other end side X2). The display unit 10 provided in the display device D is affected by electromagnetic noise because it sequentially propagates to the grounding portion 23 as a ground electrode connected to the end portion Y2) and the wiring cord 50 (one end portion Y1). There is no possibility that the element (information display body) 11 malfunctions.

  As described above, in the present embodiment, the circuit board 20 disposed on the back side of the display unit 10, the conductive member 18 configured so that one end side X1 thereof can be connected to the frame body 16, and the one end Y1 thereof are circuits. The wiring cord 50 is configured to be connectable to the grounding portion 23 of the substrate 20, and the other end X2 of the conductive member 18 opposite to the one end X1 is opposite to the one end Y1. 50, the electromagnetic noise propagates sequentially to the frame body 16, the conductive member 18, the wiring cord 50, and the grounding portion 23, so that the electromagnetic noise is transmitted to the display unit 10. It is possible to provide a display device D that does not act and does not cause the display element (information display body) 11 to malfunction.

  In the present embodiment, the display unit 10 includes a resin case 13 having a main body 13 a housed inside the frame body 16 and a fixing portion 13 b that protrudes outside the frame body 16, and the other end of the conductive member 18. The side X2 and the other end Y2 of the wiring cord 50 are fastened and fixed to the fixing portion 13b by the screw 60, so that both the other end X2 of the conductive member 18 and the other end Y2 of the wiring cord 50 are simply connected. Since the electric noise can be propagated to the grounding part 23 only by assembling it to the one fixing part 13b at a time, there is an advantage that the assembling workability is not complicated.

  In addition, this invention is not limited by the above-mentioned embodiment and drawing. Changes (including deletion of constituent elements) can be added to the embodiments and the drawings as appropriate without departing from the scope of the present invention. For example, in the above-described embodiment, the number of the fixing portions 13b is one in FIG. 2, but the number of the fixing portions 13b may be plural. At this time, the other end X2 of the conductive member 18 and the other end Y2 of the wiring cord 50 may be fastened and fixed to the plurality (individual) fixing portions 13b using the screws 60, respectively.

10 Display Unit 11 Display Element (Information Display)
13 Resin case (resin member)
13a body portion 13b fixing portion 14 front frame 15 rear frame 16 frame body 18 conductive member 18a first flat plate portion 18b second flat plate portion 20 circuit board 23 grounding portion 30 protection panel 50 wiring cord (wiring member)
51 Code body 52 First terminal 53 Second terminal 60 Screw X1 One end side of the conductive member X2 The other end side of the conductive member Y1 One end portion of the wiring cord Y2 The other end portion of the wiring cord

Claims (2)

A display unit having an information display for displaying predetermined information and a conductive frame for housing the information display;
A circuit board disposed on the anti-viewer side opposite to the viewer side of the display unit;
A conductive member whose one end is configured to be connectable to the frame body;
The one end portion includes a wiring member configured to be connectable to the grounding portion of the circuit board,
2. The display device according to claim 1, wherein the other end side of the conductive member that is opposite to the one end side is in contact with the other end portion of the wiring member that is opposite to the one end portion. The display unit includes a resin member having a main body portion housed inside the frame body and a fixing portion protruding outside the frame body,
The display device according to claim 1, wherein the other end side of the conductive member and the other end portion of the wiring member are fastened and fixed to the fixing portion by screws.

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