JP2010181394A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that prevents leak of electromagnetic waves to the outside of the device and minimizes the weight increase of the device itself. <P>SOLUTION: In this display device, a pointer type display section 10 including a pointer 11, a driving device 12 for operating the pointer 11, and a display plate 14 having a display section 14a indicated by the pointer 11 is disposed in parallel with a displaying means 20 including a display element 21 and a frame body 23 having an opening window 23a exposing a display region of the display element 21. The pointer type display section 10 has a wiring board 13 having a first control means M1 for controlling the driving device 12. This displaying means 20 includes a circuit board 24 having an outer shape smaller than that of the wiring board 13, a second controlling means M2 arranged on the circuit board 24, a wiring member 25 for conducting and connecting the display element 21 to the circuit board 24, and a shield member 26 arranged in the frame body 23 so as to surround the circuit board 24 and wiring member 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a pointer-type display unit including a pointer and a display plate having a display unit indicated by the pointer, and a display element and an opening window that accommodates the display element and exposes a display area of the display element. The present invention relates to a display device in which display means including a frame body is provided in parallel.

  Conventionally, as this type of display device, for example, the one described in Patent Document 1 below is known. The display device described in Patent Document 1 includes a vehicle instrument mounted on various vehicles, an analog display (pointer-type display unit) including a speedometer, and a liquid crystal display unit (display means) for displaying various information. ) And are arranged side by side.

JP 2003-76294 A

  Here, as an analog display, a driving device having a rotating shaft protruding from a hard wiring board is mounted, and a pointer is mounted at the tip of the rotating shaft, and a measured value indicated by the pointer is displayed behind the pointer. A structure in which a display plate having a portion (display portion) is arranged is generally known.

  Note that a hard wiring board mounted with a driving device for operating the pointer is positioned along the back of the display panel and the liquid crystal display unit. Further, the wiring board is equipped with a microcomputer (first control means) for controlling the driving device and the like, a graphic controller (second control means) and the like, and based on a command signal from the microcomputer, The graphic controller is controlled, and display control of a liquid crystal display panel provided in the liquid crystal display unit is performed by a display signal from the graphic controller.

  The liquid crystal display unit includes a liquid crystal display panel composed of a plurality of pixels arranged in a matrix, and a metal frame body that houses the liquid crystal display panel. The frame body includes a rectangular opening window portion that exposes a display area of a liquid crystal display panel that displays various information such as engine speed, travel distance, fuel consumption, time, and the like on the front surface thereof. .

  In the liquid crystal display unit, a source line driving circuit for driving a source line (signal line) of the liquid crystal display panel and a gate line (scanning line) of the liquid crystal display panel are driven in the above-described frame body which is an exterior case. In addition, a gate line driving circuit to be operated, a timing controller for generating various timing signals for controlling the timing of each driving circuit, and the like are incorporated.

  Among these, the source line driving circuit and the gate line driving circuit are integrally formed on a glass substrate which is a base material of the liquid crystal display panel on which the pixels are formed, and circuits such as a timing controller are connected to the glass substrate. Is provided on a printed circuit board formed of a separate member.

  In this case, the electrical connection between the printed circuit board and the wiring board for controlling the driving device is a signal transmission line group including various signal lines (signal lines for display signals), power supply lines, and ground lines. A flexible printed circuit board (FPC) formed of is used.

  In this FPC, one end side of the FPC on the wiring board side is mounted inside the first connector mounted on the wiring board, and the other end side of the FPC on the printed circuit board side is inside the second connector mounted on the printed board. By mounting, the signal transmission line group located on one end side of the FPC is electrically connected to the first electrode terminal group provided inside the first connector, and the signal transmission line group located on the other end side of the FPC. Are electrically connected to the second electrode terminal group provided inside the second connector (that is, a structure in which a display signal from the graphic controller is sent to the timing controller).

  By the way, in the above-described display device, it is desired to display various vehicle information in a multiplex display on the liquid crystal display panel. One means for realizing the multiplex display on the liquid crystal display panel is a pixel in the liquid crystal display panel. There is a means for increasing the number (in other words, increasing the outer shape of the liquid crystal display panel itself).

  However, when the number of pixels is increased, the display signal sent from the graphic controller to the timing controller via the FPC is increased in processing speed, and the FPC (the signal line for the display signal) has a high frequency. Since the display signal flows, unnecessary radiation noise (electromagnetic wave) is generated from the FPC. Usually, since the above-described in-vehicle display device is provided with an audio device as a peripheral device in the periphery thereof, the radiation noise leaks to the outside of the device (that is, outside the display device), and noise is generated in radio sound provided in the audio device. There is a problem of entering.

  As means for solving such a problem, there is means for disposing a metal shield member having a concave shape so as to surround the back and the periphery of the wiring board so that the radiation noise does not leak outside the display device. Can be mentioned.

  That is, in this case, the shield member has a concave shape having a bottom wall portion, a peripheral wall portion, and a front-side opening corresponding to the bottom wall portion so as to surround the back and the periphery of the wiring board. Since there is a synthetic resin case body that holds the rotating shaft of the driving device and the display board on the front side of the wiring board, it is realistic to completely cover the front side of the wiring board with a shield member. As a result, the front side opening of a relatively wide opening area is formed on the front side of the shield member, so that part of the radiation noise may leak out of the display device. There is.

In addition, in this case, since the wiring board is installed along the back of the analog display unit and the liquid crystal display unit constituting the display device, the shield member that surrounds the wiring board (particularly, the bottom wall portion of the shield member). ) Is increased in size and the weight of the metal shield member is increased, in other words, the weight of the display device is increased. In this respect, there is room for further improvement. It was left.
In view of the above-described problems, the present invention has an object to provide a display device that can prevent leakage of electromagnetic waves to the outside of the device and at the same time minimize the increase in the weight of the device itself. Is.

  The present invention includes a pointer-type display unit including a pointer, a driving device for operating the pointer, and a display plate having a display unit indicated by the pointer, the display element and the display element, and a display area of the display element Display means comprising a frame body having an opening window portion that exposes the display, and the pointer-type display portion controls the drive device behind the display plate and the display element. In the display device provided with the wiring board having one control means, the display means is arranged between the frame body and the wiring board so as to have an outer shape smaller than the outer shape of the wiring board. A circuit board; second control means disposed on the circuit board to output a display signal for operating the display element based on a command signal from the first control means; the display element; circuit A wiring member for conductively connected to a plate, characterized by comprising and a shield member disposed on the frame body so as to surround the circuit board and the wiring member.

  Further, the present invention is characterized in that the circuit board and the frame body, or the circuit board and the shield member are fixed by a predetermined fixing means.

  According to the present invention, the shield member is formed with an abutting portion that abuts an earth portion provided on the wiring board.

  Further, the present invention is characterized in that the shield member and a ground portion provided on the wiring board are conductively connected via a conductive member.

  According to the present invention, the circuit board is fixed to a boss provided on the frame body or the shield member by using a screw as the fixing means, and the boss and the circuit board are in contact with each other. At least one of the contact point and the contact point between the screw head of the screw and the circuit board has a conductive part conductively connected to a grounding part provided on the circuit board side. It is formed in these.

  According to the present invention, it is possible to provide a display device that can achieve the initial purpose, prevent the leakage of electromagnetic waves to the outside of the device, and at the same time, suppress the increase in the weight of the device itself.

1 is a front view of a display device according to a first embodiment of the present invention. AA sectional drawing of FIG. The expanded sectional view which expands and shows the B section in FIG. FIG. 3 is a block diagram showing an electrical configuration of the display device according to the first embodiment. Sectional drawing of the principal part of the display apparatus by the modification of the 1st Embodiment. Sectional drawing of the principal part of the display apparatus by 2nd Embodiment of this invention. Sectional drawing of the principal part of the display apparatus by the modification of the 2nd Embodiment. Sectional drawing of the principal part of the display apparatus by 3rd Embodiment of this invention. Sectional drawing of the principal part of the display apparatus by the modification of the 3rd Embodiment.

(First Embodiment) The case where the display device of the present invention is applied to a vehicle instrument mounted on a vehicle will be described below as an example with reference to FIGS.

  In FIG. 1, a vehicle meter D as a display device according to the present embodiment includes a pointer-type display unit 10 including a speedometer that displays a vehicle speed, and a display unit 20 including a liquid crystal display unit that displays various types of information. The pointer type display unit 10 and the display means 20 are arranged side by side.

  As shown in FIG. 2, the pointer-type display unit 10 as a speedometer includes a pointer 11, a driving device 12 including an instrument movement that operates the pointer 11, and a wiring board 13 that is electrically connected to the driving device 12. The display plate 14 is positioned between the pointer 11 and the wiring board 13 and includes a display plate 14 having a display portion 14a such as a scale or a number indicated by the pointer 11. A plurality of light sources 15 corresponding to the pointer 11 and the display board 14 are mounted on the wiring board 13 provided behind the element.

  In this case, the pointer 11 is formed of a light-transmitting material that can emit light when the light source 15 is turned on, and the display unit 14a (see FIG. 1) of the display panel 14 is irradiated with the light source 15 when the light source 15 is turned on. It is made of a light transmissive material so as to emit light upon receiving light. Further, a substantially rectangular opening 14b for exposing a required portion of the display means 20 (specifically, the display area of the display element) is formed at 14 locations on the display plate corresponding to the display means 20. .

  The wiring board 13 is made of, for example, a hard circuit board in which a wiring pattern (not shown) is provided on a glass epoxy base material, and drives and controls the driving device 12, the light source 15, the driving device 12, and the light source 15. First control means M1 for controlling the controller, various circuit components (not shown) such as a resistor and a capacitor, etc. are conductively connected to the wiring pattern. In addition, the external shape of the wiring board 13 in this example is substantially the same shape as the external shape of the vehicle instrument D as shown by a one-dot chain line in FIG.

  Further, a case body 16 made of, for example, white synthetic resin is provided on the front side of the wiring board 13. The case body 16 houses a light source 15 and transmits the light to the pointer 11 and the display board 14 side. A plurality of illumination chambers are formed for guiding. The case body 16 has a function as a holding body for holding the display panel 14. Although not shown in detail, the case body 16 is assumed to hold not only the display board 14 but also the display means 20.

  A facing member 17 is disposed in front of the case body 16 with the display plate 14 in between. The visible member 17 exposes the visible region of the pointer-type display unit 10 (that is, the pointer 11 and the display unit 14a). A first window portion 17a and a second window portion 17b having substantially the same opening shape as the opening portion 14b are formed so as to expose the display area of the display element. A transparent or translucent transparent panel 18 is disposed.

  As shown in detail in FIG. 3, the display means 20 includes a known dot matrix type display element 21, a source line drive circuit (not shown) for driving the source line (signal line) of the display element 21, and the display element 21. A printed circuit board 22 on which a gate line driving circuit (not shown) for driving the gate lines (scanning lines) and a timing controller (not shown) for generating various timing signals for controlling the timings of these driving circuits are mounted. A metal frame body 23 that houses (accommodates) the display element 21 and the printed board 22, a circuit board 24 disposed between the frame body 23 and the wiring board 13, and a printed board 22 (display element 21). ) And the circuit board 24, and the frame body 2 so as to surround the circuit board 24 and the first flexible wiring board 25. And a fixed (disposed) metallic shield case 26 which is in.

  The display element 21 includes a plurality of pixels arranged in a matrix in a display area (display area) (not shown), and based on detection signals from various sensors, the engine speed, the travel distance, the fuel consumption, It consists of a liquid crystal display panel that displays various information such as time.

  The printed circuit board 22 is composed of a hard circuit board in which a wiring part (not shown) is provided on a glass epoxy base material, for example. Yes.

  The frame body 23 is formed by press-molding a plate material made of a metal material into a substantially box shape, and functions as a storage member that stores the display element 21, the printed circuit board 22, the source line drive circuit, the gate line drive circuit, and the like. It has.

  The frame body 23 includes a substantially rectangular opening window portion 23a that exposes a display area (the plurality of pixels) of the display element 21 and a bottom portion 23b portion corresponding to the first connector K1 mounted on the back surface of the printed board 22. And a pair of bosses 23d having a substantially cylindrical shape projecting toward the circuit board 24 in a substantially central region of the bottom 23b.

  The hole 23c is formed on the right side of the bottom 23b in FIG. 3 where the printed circuit board 22 is disposed so as to avoid the position where the first connector K1 is disposed. Further, the pair of boss portions 23d include screw screw portions 23e for screwing screws S as fixing means.

  The circuit board 24 is made of, for example, a hard circuit board obtained by applying a circuit pattern (not shown) to a glass epoxy base material, and includes a second control means (graphic controller) M2 that performs display control of the display element 21; The second connector K2 that is the mating connector of the connector K1, the third connector K3 that is the mating connector of the fourth connector, which will be described later, and various circuit components such as resistors and capacitors are connected to the circuit pattern. Become connected. In this case, the second control means M2, the second and third connectors K2, K3 are mounted on the back surface of the circuit board 24. The second control means M2 may be mounted on the surface of the circuit board 24 instead of the back surface of the circuit board 24.

  Here, the outer shape of the circuit board 24 incorporated in the display means 20 in this example is that of the wiring board 13 which is one component of the pointer-type display unit 10 described above, as shown by a dotted line portion in FIG. It is smaller than the outer shape. For example, when the formation area of the pointer-type display unit 10 and the formation area of the display unit 20 are substantially equal, the outer shape of the circuit board 24 is approximately half the outer shape of the wiring board 13. In addition, 24a is formed in the substantially circular opening so that it may communicate with the screw threading part 23e, and consists of a screw hole for making the thread part of the screw S penetrate.

  When the frame body 23 and the circuit board 24 are fixed using screws S, detailed illustration is omitted. For example, first, the pair of screw screw portions 23e and the pair of screw holes 24a are communicated with each other. The boss portion 23d and the circuit board 24 are brought into close contact with each other, and then, the screw portion of the screw S is passed through the screw hole 24a, and a required portion of the screw portion formed through the screw hole 24a becomes the screw threaded portion 23e. By screwing, the fixing operation of the frame body 23 and the circuit board 24 is completed.

  The first flexible wiring board (wiring member) 25 is used for electrical connection between the printed circuit board 22 (first connector K1) and the circuit board 24 (second connector K2). , A first signal transmission line (not shown) including a signal line and a ground line.

  In the first flexible wiring board 25, one end side of the first flexible wiring board 25 on the printed circuit board 22 side is mounted inside the first connector K1, and thereby the first flexible wiring board 25 is located on the one end side. The signal transmission lines are electrically connected to a plurality of first electrode terminals (not shown) provided in the first connector K1.

  Similarly, the other end side of the first flexible wiring board 25 on the circuit board 24 side is mounted inside the second connector K2, so that the first signal transmission line located on the other end side A plurality of second electrode terminals (not shown) provided inside the second connector K2 are electrically connected to each other.

  The shield case (shield member) 26 is made of a conductive material such as iron, is formed in a substantially concave shape in cross section, and has a substantially rectangular open portion 26a in which the front side which is the bottom 23b side of the frame body 23 is opened (opened). And a thin plate-like bottom wall portion 26b corresponding to the open portion 26a, a thin plate-like side wall portion 26c formed of a standing wall portion surrounding the bottom wall portion 26b, and a side wall portion 26c on the open portion 26a side. And a thin plate-like flange portion 26d extending outward.

  In FIG. 3, in the vicinity of the boundary portion between the bottom wall portion 26b and the side wall portion 26c on the left side, a third connector K3 mounted on the back surface of the circuit board 24 and a counterpart of the third connector K3 A through-hole 26e having a small opening shape is provided to allow the second flexible wiring board 30 to be electrically connected to the fourth connector K4 mounted on the wiring board 13 to be a side connector. It will be. The second flexible wiring board 30 has the same configuration as the first flexible wiring board 25 described above.

  In the case of the present embodiment, the shield case 26 is fixed to the frame body 23 (bottom portion 23b) so as to surround the circuit board 24 and the first flexible wiring board 25 by the bottom wall portion 26b and the side wall portion 26c ( Arrangement). At this time, the metal shield case 26 is fixed to the metal frame body 23 (bottom portion 23b) so that the flange portion 26d of the shield case 26 and the bottom portion 23b of the frame body 23 come into contact with each other.

  Although detailed description is omitted, in order to fix the shield case 26 and the frame body 23, the flange portion 26d and the corresponding bottom portion 23 are fixed by well-known bolt fixing (screw fixing) or welding fixing. Is possible.

  A vehicle instrument (display device) D is configured by the above-described units. Next, the electrical configuration of the display device D in the present embodiment will be described with reference to FIG. In FIG. 4, M1 is a first control means, M2 is a second control means, 21 is a display element, 12 is a driving device, and 15 is a light source.

  The first control means M1 is composed of a ROM having a processing operation program stored therein, a RAM for temporarily storing calculation values, a microcomputer having a CPU for executing the program, and the like. It is mounted on a wiring board 13 provided (see FIG. 2).

  The first control means M1 performs predetermined program processing based on detection signals input from various sensors, and sends a command signal (hereinafter referred to as a first command signal) for prompting display of a measured value to be displayed on the display element 21. Output to the second control means M2 through the second flexible wiring board 30. At the same time, the first control means M1 performs predetermined program processing based on the detection signal, and outputs a control signal for controlling the operation of the driving device 12 and the light source 15 as a second command signal.

  The control signal output from the first control means M1 is input to drivers (not shown), and these drivers output drive signals for operating the driving device 12 and the light source 15 in accordance with the signal input. In response, the driving device 12 and the light source 15 are activated. That is, the pointer 11 swings and moves on the display plate 14 with the operation (drive) of the drive device 12, and the display unit 14 is lit and displayed with the operation (lighting) of the light source 15.

  The second control means M2 comprises a graphic controller, is mounted (arranged) on the circuit board 24 provided in the display means 20, and controls the display element 21 based on the first command signal from the first control means M1. A display signal for operation is output to the display means 20 (the timing controller).

  Specifically, the second control means M2 draws an image to be displayed by the display element 21 based on the first command signal, stores the image information in a buffer memory (not shown), and In order to display an image based on information on the display element 21, a display signal is output to the display means 20 (the timing controller).

  This display signal is sent to the timing controller through the signal line in the first flexible wiring board 25, and the timing controller controls various timing signals for controlling the timing of the source line driving circuit and the gate line driving circuit. Is generated. Then, the source line driving circuit and the gate line driving circuit are driven based on the various timing signals to operate the display element 21, thereby causing the display element 21 to have a desired image based on the display signal (that is, Various information such as engine speed and travel distance) is displayed.

  By the way, when the number of pixels of the display element 21 is increased so as to multiplex display such various information, the graphic controller M2, which is the second control means, passes through the first flexible wiring board 25 to the timing controller. As the processing speed of the display signal sent is increased, a high-frequency display signal flows in the signal line (that is, the display signal signal line) in the first flexible wiring board 25, so that the first flexible wiring board 25 generates unnecessary radiation noise (electromagnetic waves).

  However, in the present embodiment, the first flexible wiring board 25 is disposed inside the metal shield case 26 as shown in FIG. In other words, the amount of the radiation noise that leaks to the outside of the vehicle meter D can be reduced as much as possible.

  Therefore, even when an audio device is provided as a peripheral device around the vehicle meter D, there is no risk of noise entering radio sound provided in the audio device. That is, malfunction of the peripheral device due to the generation of the radiation noise is prevented. The shield case 26 in this example is provided with a through-hole 26e having a small opening shape. However, the amount of the radiation noise that leaks from the through-hole 26e is extremely small so that the peripheral device does not malfunction. It has become a quantity.

  Furthermore, according to the present embodiment, the circuit board 24 serving as a sub control board having an outer shape smaller than the outer shape of the wiring board 13 serving as the main control board in the vehicle instrument D is incorporated in the display means 20, and 24 and a first flexible wiring board 25 necessary for supplying signals from the circuit board 24 to the display element 21, the shield case 26 is fixed to the metal frame body 23. Yes.

  Therefore, conventionally, a shield case is provided so as to surround the wiring board (the main control board) arranged along the back of the pointer-type display unit and the liquid crystal display unit (display means) constituting the vehicle instrument. However, in this example, the circuit is not the wiring board 13 which is the main control board, but is configured with an outer shape smaller than the outer shape of the wiring board 13 and is incorporated in the liquid crystal display unit (display means) 20. Since the board 24 (the sub-control board) is surrounded by the shield case 26, the weight of the shield case is reduced as compared with the conventional case, thereby making it possible to minimize the increase in the weight of the vehicle instrument. It becomes.

  As described above, in the present embodiment, the pointer type display unit 10 including the pointer 11, the driving device 12 that operates the pointer 11, and the display plate 14 having the display unit 14 a that the pointer 11 indicates, the display element 21, and the display element 21 and a display means 20 including a frame body 23 having an opening window 23a that exposes a display area of the display element 21 are provided side by side. The pointer-type display unit 10 includes a display plate 14 and a display element. In the display device (vehicle instrument D) in which the wiring board 13 having the first control means M <b> 1 for controlling the driving device 12 is provided on the rear side of 21, the display means 20 is based on the outer shape of the wiring board 13. The display element 21 is moved based on the circuit board 24 arranged between the frame body 23 and the wiring board 13 so as to have a small outer shape, and the first command signal from the first control means M1. In order to output the display signal, the second control means M2 disposed on the circuit board 24, the first flexible wiring board 25 that electrically connects the display element 21 and the circuit board 24, the circuit board 24, And a shield case 26 disposed on the frame body 23 so as to surround the first flexible wiring board 25.

  Therefore, for example, when the number of pixels of the display element 21 is increased, even if the radiation noise is generated from the first flexible wiring board 25 as the processing speed of the display signal is increased, the first flexible wiring board 25 is Since it is surrounded by the shield case 26, leakage of the radiation noise to the outside of the vehicle meter D is prevented as much as possible.

  In addition to this, in this example, the wiring board 13 is not the main control board, but is formed with an outer shape smaller than the outer shape of the wiring board 13 and incorporated in the liquid crystal display unit (display means) 20. Since the circuit board 24 (the sub-control board) is surrounded by the shield case 26, the weight of the shield case is reduced compared to the conventional case, thereby minimizing the increase in the weight of the vehicle instrument. Is possible.

  In the present embodiment, the second connector K2 that is the mating connector of the first connector K1 mounted on the printed board 22 and the second connector that is the mating connector of the fourth connector K4 mounted on the wiring board 13 are also used. Although the example in which the three connectors K3 are both mounted on the back surface of the circuit board 24 has been described, at least one of the second and third connectors K2 and K3 may be mounted on the surface of the circuit board 24.

  In the present embodiment, the example in which the frame body 23 and the circuit board 24 are fixed using the screws S has been described. However, instead of the frame body 23 and the circuit board 24 as described above, a modification of the first embodiment is provided. As an example, as shown in FIG. 5, the circuit board 24 and the shield case 26 may be fixed by screws S as fixing means.

  That is, in this case, the pair of boss portions 23d of the frame body 23 employed in the above-described embodiment is abolished, a pair of boss portions 26f are provided in the shield case 26, and the screw holes of the circuit board 24 are provided in the boss portions 26f. A pair of screw threaded portions 26g each communicating with 24a is provided, the threaded portion of the screw S is passed through the screw hole 24a, and a required portion of the threaded portion penetrating the screw hole 24a is screwed into the screw threaded portion 26g. As a result, the circuit board 24 is fixed to the shield case 26.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals are used for the same or corresponding parts as in the first embodiment, and the detailed description thereof will be made. Omitted. In the second embodiment, based on the structure of the first embodiment, a ground case 13a that forms a ground pattern is provided at a predetermined location on the wiring board 13 and is arranged so as to be separated from the wiring board 13. 26, a protrusion (contact portion) 26h having a protrusion shape is formed integrally with the bottom wall portion 26b of the protrusion 26 so as to contact (contact) the ground portion 13a.

  That is, the projecting portion 26h is formed of a hanging portion that is suspended from the bottom wall portion 26b facing (corresponding to) the grounding portion 13a toward the grounding portion 13a, and the tip thereof is as shown in FIG. 13a is contacted. Thus, when the shield case 26 is grounded (ground connection) in accordance with the contact between the protrusion 26h and the ground portion 13a, not only the ground portion 13 but also the ground portion 13, the shield case 26, and the metal frame body 23 are connected. Thus, a ground region is formed, and such an increase in the ground region can be said to be a stable grant.

  According to the second embodiment, for example, when the number of pixels of the display element 21 is increased, even if the radiation noise is generated from the first flexible wiring board 25 as the processing speed of the display signal is increased, Since one flexible wiring board 25 is surrounded by the shield case 26 connected to the ground, there is an advantage that leakage of the radiation noise to the outside of the vehicle meter D can be prevented more reliably.

  In the second embodiment, the protruding portion 26h is integrally formed on the shield case 26, and the protruding portion 26h is in contact with the grounding portion 13a of the wiring board 13. For example, in the second embodiment, As a modified example, as shown in FIG. 7, the shield case 26 (bottom wall portion 26 b) and the ground portion 13 a are interposed through a conductive member 40 such as a support column made of a conductive material formed separately from the shield case 26. It may be configured to be connected in a conductive manner. In addition, an elastic body made of a conductive material having a spring property is adopted as the conductive member 40, and one end side of the elastic body is brought into contact with the ground portion 13a, and the other end side of the elastic body is set to a predetermined portion of the bottom wall portion 26b. You may make it contact a location.

  Further, as another modification of the second embodiment, although detailed illustration is omitted, the bottom wall portion 26b is directly brought into contact with the ground portion 13a without separating the bottom wall portion 26b and the ground portion 13a. It is also possible to adopt. In this case, the bottom wall portion 26b corresponds to the contact portion described above. At this time, in order to pass the second flexible wiring board 30, in FIG. 6 (FIG. 7), the through hole provided in the vicinity of the boundary portion between the bottom wall portion 26b and the side wall portion 26c on the left side. It is necessary to eliminate 26e and to provide a through hole (not shown) for passing the second flexible wiring board 30 in the side wall portion 26c located on the left side in FIG. 6 (FIG. 7).

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. 8. The same reference numerals are used for the same or corresponding parts as those in the first embodiment, and a detailed description thereof will be given. Omitted. In the third embodiment, the arrangement of the boss 23d is avoided on the circuit board 24 where the boss portions 23d and the circuit board 24 come into contact with each other, based on the configuration of the first embodiment. A land portion (conductive portion) 24c that can be electrically connected to the ground portion 24b provided on the circuit board 24 is formed.

  That is, in the case of the third embodiment, the circuit board 24 is screwed to the pair of boss parts 23d provided in the frame body 23 using the screws S, and the pair of boss parts 23d and the circuit board 24 are further fixed. A substantially annular land portion 24c made of a copper foil pattern, which is conductively connected to the ground portion 24b forming the ground pattern, is formed on the circuit board 24 side at the contact portion, whereby the ground portion 24b and the land portion 24c are formed. The metal frame body 23 and the shield case 26 constitute a ground region. Such an increase in the ground region can be said to be a stable grant.

  Also in the third embodiment, as in the second embodiment, for example, when the number of pixels of the display element 21 increases, the radiation from the first flexible wiring board 25 increases as the processing speed of the display signal increases. Even if noise occurs, the first flexible wiring board 25 is surrounded by the shield case 26 connected to the ground, so that leakage of the radiation noise to the outside of the vehicle instrument D can be prevented more reliably. There are benefits.

  In the third embodiment, the example in which the land portions 24c are formed in the surface region of the circuit board 24 on the pair of boss portions 23d side in the region facing the pair of boss portions 23d in the surface region has been described. However, for example, a substantially annular land portion 24c may be provided only in a region facing the one boss portion 23d in the surface region, or, as a modification of the third embodiment, as shown in FIG. A grounding portion 24b is provided in the back surface region of the circuit board 24 opposite to the surface region instead of the region so as to avoid the positions where the screws S and the second and third connectors K2 and K3 are disposed. Of these, a substantially annular land portion 24c that can be conductively connected to the grounding portion 24b may be provided in a region of each screw S facing the screw head S1.

  In the case of the modification in the third embodiment, the circuit board 24 is screwed to the pair of boss portions 23d provided in the frame body 23 using screws S, and then the circuit board 24 and the screws S are fixed. A substantially annular land portion 24c that is conductively connected to a grounding portion 24b that forms a ground pattern formed in the back surface region is formed on the circuit board 24 side at a contact portion with the screw head S1. Also in this modified example, since the grounding portion 24b, the land portion 24c, the frame body 23, and the shield case 26 are connected to the ground via the screw S, the same operational effects as in the third embodiment can be obtained. Become.

  In this case, the graphic controller M2 is arranged so that the grounding portion 24b, the land portion 24c, the boss portion 23d, and the second and third connectors K2 and K3 are disposed at substantially the center of the surface area on the circuit board 24. Implemented in the department. In addition, a configuration in which the configuration of the third embodiment described above (that is, the configuration of FIG. 8) and the configuration of the modified example of the third embodiment (that is, the configuration of FIG. 9) are used together, in other words, the boss portion 23d side and Of course, it is possible to employ a configuration in which the land portions 24c are respectively provided on the front and back surfaces of the circuit board 24 on the screw head S1 side.

  In the third embodiment, the basic configuration is the configuration of the first embodiment (that is, the configuration in which the frame body 23 and the circuit board 24 are fixed with screws S as shown in FIG. 3). Although the example in which the grounding part 24b and the land part 24c that can be conductively connected to the grounding part 24c are provided in FIG. 24 is described, for example, the configuration of the modified example of the first embodiment (that is, as shown in FIG. It is also possible to apply the technical idea adopted in the third embodiment with a basic configuration of the configuration in which the screw S is fixed using a screw S.

  That is, although detailed illustration is omitted, with respect to the basic configuration shown in FIG. 5, a grounding portion is provided in the surface region of the circuit board 24 that is a region from which the screw head protrudes so as to avoid the screw placement position, In this surface region, a substantially annular land portion that is conductively connected to the grounding portion may be provided in a region facing the screw head, or the boss portion 26f and the rear surface region of the circuit board 24 where the boss portion 26f is located. A grounding portion is provided so as to avoid the placement positions of the graphic controller M2 and the second and third connectors K2 and K3, and a substantially annular shape is connected to the grounding portion in a region facing the boss portion 26f in the rear surface region. The land portion may be provided.

  In this case, when the land portion is provided in the surface region on the screw head side, the land portion may be formed only in a region facing one of the two screws or on the boss portion 26f side. Needless to say, when it is provided in the back region, it may be formed only in the region facing one of the two boss portions 26f.

DESCRIPTION OF SYMBOLS 10 Pointer type display part 11 Pointer 12 Driving device 13 Wiring board 13a Grounding part 14 Display board 14a Display part 20 Display means 21 Display element 22 Printed circuit board 23 Frame body 23a Opening window part 23d, 26f Boss part 24 Circuit board 24b Grounding part 24c Land part (conductive part)
25 Flexible wiring board (wiring member)
26 Shield case (shield member)
26h Protruding part (contact part)
40 conductive member M1 microcomputer (first control means)
M2 graphic controller (second control means)
S screw (fixing means)
S1 Screw head

Claims (5)

A pointer-type display unit including a pointer, a driving device that operates the pointer, and a display plate having a display unit that is indicated by the pointer, and an opening that accommodates the display element and the display element and exposes a display area of the display element And a display means comprising a frame body having a window,
In the display device in which the pointer-type display unit is provided with a wiring board having a first control means for controlling the driving device on the back side of the display plate and the display element
The display means is a circuit board disposed between the frame body and the wiring board so as to have an outer shape smaller than the outer shape of the wiring board;
Second control means disposed on the circuit board to output a display signal for operating the display element based on a command signal from the first control means;
A wiring member for conductively connecting the display element and the circuit board;
And a shielding member disposed on the frame body so as to surround the circuit board and the wiring member. The display device according to claim 1, wherein the circuit board and the frame body, or the circuit board and the shield member are fixed by a predetermined fixing means. The display device according to claim 1, wherein a contact portion that contacts an earth portion provided on the wiring board is formed on the shield member. The display device according to claim 1, wherein the shield member and a ground portion provided on the wiring board are conductively connected via a conductive member. The circuit board is fixed to a boss provided on the frame body or the shield member by using a screw as the fixing means,
At least one of the contact portion between the boss portion and the circuit board and the contact portion between the screw head of the screw and the circuit board is electrically connected to the grounding portion provided on the circuit board. The display device according to claim 2, wherein a conductive portion to be connected is formed on the circuit board side.

Images