JP2008102336A - Lcd module and display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LCD module structure capable of minimizing the influence of noise, reducing the number of connector pins and easily coping with variation in type, and to provide a display device for vehicle using the LCD module structure. <P>SOLUTION: In the LCD module, an LCD 13 and a wiring substrate 11 on which a driving circuit for the LCD 13 is mounted are assembled to each other and, on the wiring substrate 11, an internal connector 18 for electrically connecting the wiring substrate 11 with another substrate and a circumscribing connector 19 for electrically connecting the wiring substrate 11 with external equipment are further mounted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an LCD (liquid crystal display) module and a vehicle display device using the same.

  As a display device for a vehicle, a device in which various indicating instruments such as a speedometer, a water temperature meter, and a fuel meter are accommodated as a pointer-type indicating instrument, and a highly useful LCD is accommodated as an information display device is known (for example, , See Patent Document 1).

  FIG. 6 is an exploded perspective view showing this type of conventional vehicle display device. In FIG. 6, in the meter case 101 in which various indicator-type indicating instruments such as a speedometer, a water temperature meter, and a fuel meter are accommodated, the center portion projects from the rear surface 101 a of the meter case 101 to the front side, and the front end is open. A case body 121 is integrally formed. The case body 121 has a reflector 122 integral with the case body 121 on the inner side, and the rear surface 122a of the reflector 122 (that is, the rear surface 101a of the meter case 101) sandwiches the main board 116 for illumination. The backlight 108 is attached.

  Further, a claw portion 123 is integrally formed at the front open end of the case body 121, and the LCD 106 and the filter 120 are attached so as to close the front open end of the case body 121 via the claw portion 123. Has been made. Further, a step portion 124 and a claw portion 125 are integrally formed on the upper surface of the case body 121, and is arranged in a substantially L shape together with the LCD 106 and is electrically connected to the LCD 106 (driving IC) 126. The LCD driving substrate 107 having the above is held on the upper surface of the case body 121 by the step portion 124 and the claw portion 125.

  A flexible main board 116 to which various measurement signals are input is attached to the rear face 101a of the meter case 1. A connector 127 extending from the main board 116 is attached to the rear face 101a of the meter case. It is guided into the meter case 101 through the formed opening 128 and is connected to the drive circuit 126 of the LCD drive substrate 107 held by the case body 121. The above-described configurations constitute a backlight type liquid crystal display device that displays the vehicle speed in the meter case 101.

  An LCD 106 of the vehicle display device shown in FIG. 6 is attached to a case body 121 formed integrally with the meter case 101, and a substrate 107 having a drive circuit 126 arranged in an approximately L shape together with the LCD 106 is connected to the main substrate 116. The connector 127 is electrically connected.

Since the display content of the LCD 106 is relatively simple, a segment type LCD that displays fixed characters and figures is used. Further, since the control is simple, the LCD drive substrate 107 is driven. Electronic components such as ICs are installed.
Japanese Utility Model Publication No. 3-52770

  However, in recent years, in order to support various display forms, dot matrix type LCDs that can display arbitrary different characters and figures one after another have been used, and the control thereof becomes complicated, so centralized control by the CPU. Came to be done. As a result, in order to cope with various forms, it has been necessary to set many types of substrates on which a large number of types of electronic components including a CPU are mounted. Therefore, a configuration having a centralized mounting board is considered.

  FIG. 7 is a diagram showing an electrical configuration of a vehicle display device having such a concentrated mounting substrate. In FIG. 7, the vehicle display device includes a main board 2 and an LCD module 20 as a centralized mounting board mounted on the main board 2. The LCD module 20 is electrically connected to the CPU 17a, the LCD driving IC 17b, the LCD 13, the EEPROM 17i, and the I / O (input / output) circuits 17ja to 17jn, and the internal connectors 27 and 29 mounted on the main board 2. Inward connectors 18 and 30 are mounted.

  The main board 2 includes an internal unit for driving various indicator instruments each composed of a stepper motor, for example, an internal unit 21 for a speedometer, an internal unit 22 for a tachometer, an internal unit 23 for a fuel meter, an internal unit 24 for a water temperature gauge, a current Meter internal unit 25 and pressure gauge internal unit 26, LEDs 28a to 28n for dial illumination and warning illumination, power supply circuit 17d1, I / O (input / output) circuits 17f to 17h, external connector 19 Internal connectors 27 and 29 are mounted.

  The external connector 19 connects the + B terminal for connecting the + B power supply from the outside of the main board 2 to the power supply circuit 17d1, the GND terminal for connection to the ground, and the on / off signal of the ignition switch from the outside to the I / O circuit 17f. IGN (+) terminal, IGN (+) terminal for connecting an external illumination control signal to the I / O circuit 17g, vehicle speed detection signals from various external sensors (not shown), various warning detection signals, etc. And a CAN terminal connected to the I / O circuit 17h in the CAN system.

  The internal connector 29 connects a power supply line (for example, 5V) from the power supply circuit 17d1 to the Vcc terminal of the CPU 17a, and connects the / RST signal output terminal of the power supply circuit 17d1 to the / RST input terminal of the CPU 17a. A terminal for connecting the / SLP output terminal of the CPU 17a to the / SLP input terminal of the power supply circuit 17d1, a terminal connected to the I / O circuit 17f, and a terminal connected to the I / O circuit 17g And a terminal connected to the I / O circuit 17h.

  The internal connector 27 is connected to the speedometer inner unit 21, the tachometer inner unit 22, the fuel meter inner unit 23, the water temperature meter inner unit 24, the ammeter inner unit 25, and the pressure gauge inner unit 26. And terminals connected to the LEDs 28a to 28n for dial illumination and warning illumination.

  The internal connector 30 of the LCD module 20 that is electrically connected to the internal connector 29 includes a terminal connected to the Vcc terminal of the CPU 17a, a terminal connected to the / RST terminal, and a terminal connected to the / SLP terminal. A terminal for inputting the output of the I / O circuit 17f to the CPU 17a, a terminal for inputting the output of the I / O circuit 17g to the CPU 17a, and an output of the I / O circuit 17h connected to the CAN input of the CPU 17a. Terminal.

  The internal connector 18 of the LCD module 20 that is electrically connected to the internal connector 27 includes internal units, that is, an internal unit 21 for a speedometer, an internal unit 22 for a tachometer, an internal unit 23 for a fuel meter, and a water temperature gauge. Terminal connected to the drive output line from the CPU 17a for driving the internal unit 24, the ammeter internal unit 25 and the pressure gauge internal unit 26, and each LED drive output from the CPU 17a to the I / O circuit 17ja ~ 17jn, and a terminal for supplying to each LED.

  However, in the configuration having the centralized mounting board described above, the external connector exists on the main board outside the centralized mounting board, so that a long connection line is required, and the internal connector is also an external signal from the external connector 19. In addition, since an internal connector for connecting the power supply line to the CPU 17a is required for both the main board 2 and the LCD module 20 as the central mounting board, there is a problem that the number of connector poles increases.

  In view of the above-described problems, the present invention provides an LCD module structure that can reduce the influence of noise, reduce the number of connection connector poles, and can easily cope with a wide variety of products, and a vehicle display device using the same. The purpose is that.

  The LCD module according to the first aspect of the present invention, which has been made in order to solve the above-mentioned problems, includes an LCD and a wiring board on which a driving circuit for the LCD is mounted, and the wiring board includes the wiring board. An internal connector for electrical connection to another substrate and an external connector for electrical connection to an external device are further mounted.

  In the invention described in claim 1, in the LCD module, an LCD and a wiring board on which an LCD driving circuit is mounted are assembled to each other, and the wiring board is electrically connected to another board. And an external connector for electrical connection to an external device. As a result, the LCD module is integrated to include the external connector, so the wiring that is highly affected by noise, such as the power supply and reset line, can be shortened. This increases the noise resistance, and the external signal from the external connector. In addition, there is no need to provide an internal connector for connecting the power line to the CPU, the number of connector poles of the internal connector can be reduced, and it is possible to easily cope with a wide variety of vehicle display devices.

  In order to solve the above-mentioned problems, the vehicle display device according to claim 2 is the LCD module according to claim 1, wherein the LCD has a screen that can be viewed from the front of the wiring board. It is housed in an LCD case fixed on a wiring board, and is held by an LCD holder that is disposed in front of the LCD and engaged with the LCD case.

  In the second aspect of the invention, the LCD is housed in an LCD case fixed on the wiring board so that the screen can be seen from the front of the wiring board, and is disposed on the front surface of the LCD and is associated with the LCD case. It is held by a combined LCD holder. Thus, the LCD can be reliably assembled to the wiring board so that the LCD screen can be viewed from the front of the wiring board.

  The vehicle display device according to claim 3, which has been made to solve the above-described problem, is a case, a main board that is disposed on the back surface of the case, and on which an internal unit for driving a pointer-type pointing device is mounted, A vehicular display device comprising a back cover disposed on the back surface of the main substrate, a facing disposed on the front surface of the case, and a front glass disposed on the front surface of the facing, The LCD module according to claim 1 or 2 is mounted so that the screen can be seen from the front of the front glass, and the main board and the LCD module are electrically connected by the internal connector, The external connector is arranged to be exposed from the back cover through an opening formed in the back cover.

  In the invention described in claim 3, the case, the main board that is disposed on the back surface of the case and on which the driving internal unit of the pointer type pointing device is mounted, the back cover that is disposed on the back surface of the main board, A display device for a vehicle comprising a turn arranged on the front and a front glass arranged on the front of the turn, wherein the LCD module of claim 1 or 2 is provided on the main substrate with the screen of the front glass. It is mounted so that it can be seen from the front. The main board and the LCD module are electrically connected by an internal connector. The external connector is disposed so as to be exposed from the back cover through an opening formed in the back cover. As a result, various vehicle display devices having the LCD module as a common component can be provided.

  According to the first aspect of the present invention, since the LCD module is integrated including the external connector, the wiring having a large influence of noise such as the power source and the reset line can be shortened, so that the noise resistance is increased. It is not necessary to provide an internal connector for connecting an external signal or power line from the external connector to the CPU, the number of connector poles of the internal connector can be reduced, and a variety of vehicle display devices can be used. Can be easily handled.

  According to the second aspect of the present invention, the LCD can be reliably assembled to the wiring board so that the LCD screen can be viewed from the front of the wiring board.

  According to the third aspect of the present invention, it is possible to provide various vehicle display devices having the LCD module as a common component.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view of a vehicle display device using an LCD module according to an embodiment of the present invention. In FIG. 1, the vehicle display device includes a back cover 1, a main substrate 2, a case 3, a turn 4, a front glass 5, and an LCD module 10.

  The back cover 1 is formed of a resin-made integrally formed product having a substantially rectangular outer shape and a recess capable of accommodating an electronic component mounted on the main board 2. On the side wall of the back cover 1, a boss 1a for attaching the main board 2 and a backlash restricting portion 1b made of an elastic protruding piece for restricting backlash when the main board 2 is attached are erected. The part is formed with an engaging claw 1c for engaging with the case 3. Further, a positioning boss 1 d and a screw hole 1 e for attaching the LCD module 10 are erected in the vicinity of the inner center of the back cover 1. Further, an opening 1 f for exposing the external connector 19 of the LCD module 10 to the outside is formed on the bottom surface of the concave portion of the back cover 1.

  The main board 2 is formed of a substantially rectangular wiring board, and includes a positioning hole 2a in which the boss 1a of the back cover 1 is fitted, a notch 2b in which the back-restricting portion of the back cover 1 is fitted, and the LCD module 10. And an opening 2c that is useful for mounting. On the back side of the main board 2, there are drive units for various indicating instruments, each consisting of a stepper motor, for example, a speedometer inner unit 21, a tachometer inner unit 22, a fuel meter inner unit 23, and a water temperature meter inner unit 24. The ammeter inner unit 25 and the pressure gauge inner unit 26 are fixed and connected to the wiring pattern. The rotary shafts 21 a, 22 a, 23 a, 24 a, 25 a and 26 a of each internal unit penetrate through the front side of the main board 2 and protrude. Further, on the front side of the main board 2, male connectors 27 for electrical connection with the LCD module 10 are mounted on portions that protrude so as to face each other in the opening 2c, and are connected to the wiring pattern. Yes. Although not shown in FIG. 1, on the front side of the main board 2, a plurality of LEDs (LED 28 in FIG. 5) for dial illumination and warning illumination and a minimum necessary electronic circuit (LED current limiting resistor, A noise removal capacitor or the like) is also mounted and connected to the wiring pattern.

  The case 3 is made of an integrally molded product made of resin having a substantially rectangular outer shape. A claw receiving portion 3 a for attaching the back cover 1, a claw receiving portion 3 b for attaching the front glass 5, and a claw receiving portion 3 c for attaching the facing 4 are formed on the side portion of the case 3. An opening 3d for the LCD module 10 is formed near the inner center of the case 3, and openings (not shown) for attaching the dials 31 and 32 are formed on both sides thereof.

  The dial 31 is formed of a substantially rectangular plate, and a speedometer dial design 31a, an ammeter dial design 31b, and a pressure gauge dial design 31c are applied by printing or the like. The dial 32 is formed of a substantially rectangular plate, and is provided with a dial design 32a for a tachometer, a dial design 32b for a fuel meter, and a dial design 32c for a water temperature meter by printing or the like.

  In the central portions of the dial designs 31a to 31c and 32a to 32c, pointer holes are respectively formed, and the pointers 33 to 38 are respectively attached to the rotary shafts 21a to 26a of the corresponding internal units through the pointer holes. It has been.

  An engagement claw 4a for engaging the case 3 is formed on the side of the turntable 4, and an opening 4b for the LCD module 10 and an opening for other indicating instruments such as a speedometer are formed on the inside thereof. The part is formed. Engagement claws 5 a for engaging with the case 3 are formed on the side of the front glass 5.

  As shown in FIG. 2, the LCD module 10 is modularized including a wiring board 11, an LCD case 12, an LCD 13, an LCD holder 14, an internal connector 18 and an external connector 19. The wiring board 11 has a substantially quadrangular shape, and four positioning holes 11a and two screw holes 11b are formed at the corners thereof, and terminal through holes 11c are formed near the outer edge thereof.

  Further, an LCD case 12 is fixed near the center of the surface of the wiring board 11, and a dot matrix type LCD 13 is accommodated in the LCD case 12 so that the screen 13 a can be seen from the front surface of the wiring board 11. ing. An LCD holder 14 for holding the LCD 13 accommodated in the LCD case S12 is disposed on the front surface of the LCD 13, and an engaging claw 14a formed on the side of the LCD holder 14 is engaged with a claw receiving portion (not shown) of the LCD case. It is fixed by joining. An FPC connector 16 to which an FPC 15 extending from the LCD 13 is electrically connected is further mounted on the surface of the wiring board 11.

  On the back surface of the wiring board 11, electronic components including a CPU 17a for controlling the overall operation of the vehicle display device, an LCD driver 17b for driving the LCD, a driver IC 17c, and a power supply IC 17d are mounted near the center. Further, two female connectors 18 for electrical connection to the connector 27 mounted on the main board 2 are mounted at positions corresponding to the connector 27 in the vicinity of the opposing side edges. Further, on the back side of the wiring board 11, an external connector 19 for connecting to an external device is mounted in a space other than a portion where the above-described electronic components and the internal connector 18 are mounted.

  FIG. 3 is a diagram illustrating an electrical configuration of the vehicle display device. The vehicle display device includes a main board 2 and an LCD module 10 as a central mounting board mounted on the main board 2. The LCD module 10 includes a CPU 17a, an LCD drive IC 17b, an LCD 13, an EEROM 17i, I / O (input / output) circuits 17ja to 17jn, an internal connector 18, a power supply circuit 17d1, and I / O (input / output) circuits 17f to 17h. The external connector 19 is mounted.

  The power supply line (for example, 5V), the / RST signal output terminal, and the / SLP signal input terminal of the power supply circuit 17d1 are respectively connected to the Vcc terminal and / RST signal input terminal of the CPU 17a according to the wiring pattern of the LCD module without using the internal connector. And / SLP signal output. The I / O (input / output) circuits 17f to 17h are each connected to the input terminal of the CPU 17a by the wiring pattern of the LCD module without using the inscribed connector.

  The main board 2 includes an internal unit for driving various indicator instruments each composed of a stepper motor, for example, an internal unit 21 for a speedometer, an internal unit 22 for a tachometer, an internal unit 23 for a fuel meter, an internal unit 24 for a water temperature gauge, a current A meter internal unit 25 and a pressure gauge internal unit 26, LEDs 28a to 28n for dial illumination and warning illumination, and an internal connector 27 are mounted.

  The external connector 19 has an + B terminal for connecting an external + B power supply to the power supply circuit 17d1, a GND terminal connected to the ground, and an IGN (+) for connecting an external on / off signal of an ignition switch to the I / O circuit 17f. The IGN (+) terminal for connecting the terminal, the illumination control signal from the outside to the I / O circuit 17g, the vehicle speed detection signal from the various external sensors (not shown), the various warning detection signals, etc. CAN terminal connected to the / O circuit 17h.

  The internal connector 27 is connected to the speedometer inner unit 21, the tachometer inner unit 22, the fuel meter inner unit 23, the water temperature meter inner unit 24, the ammeter inner unit 25, and the pressure gauge inner unit 26. The terminal connected to the LEDs 28a to 28n for the dial illumination and warning illumination, and the + B power supply voltage from the + B terminal of the external connector 19 via the internal connector 18 for the dial illumination and warning illumination And terminals for connecting to the LEDs 28a to 28n.

  The internal connector 18 of the LCD module 20 that is electrically connected to the internal connector 27 includes internal units, that is, an internal unit 21 for a speedometer, an internal unit 22 for a tachometer, an internal unit 23 for a fuel meter, and a water temperature gauge. Terminal connected to the drive output line from the CPU 17a for driving the internal unit 24, the ammeter internal unit 25 and the pressure gauge internal unit 26, and each LED drive output from the CPU 17a to the I / O circuit 17ja ~ And a terminal connected to each LED via 17 jn and a terminal connected to the + B terminal of the external connector 19.

  Next, a method for assembling the vehicle display device will be described. As shown in FIG. 4, the vehicle display device is assembled by first placing the main board 2 on which the internal unit for driving various indicator instruments and the lighting and warning LEDs are mounted on the back cover 1 and positioning it. The boss 1a of the back cover 1 is fitted into the hole 2a, and the backlash restricting portion 1b of the back cover 1 is fitted into the notch 2b. Thereby, since the backlash restricting portion 1b is formed of an elastic protruding piece, the main substrate 12 is placed on the back cover 1 without backlash due to its elasticity.

  Next, the LCD module 10 is electrically connected to the main board 2 by connecting its internal connector 18 to the connector 27 of the main board 2 and the opening 2c of the main board 2 to the positioning hole 11a of the back cover 1. The positioning boss 1d is fitted via Thus, the external connector 19 is exposed to the outside through the opening 1 f of the back cover 1 through the opening 2 c of the main board 2.

  Next, as shown in FIG. 1, the case 3 is placed on the main board 2, and the engaging claw 1 c of the back cover 1 is engaged with the claw receiving portion 3 a of the case 3. Thereby, the main board 2 and the LCD module 10 are sandwiched between the back cover 1 and the case 3.

  FIG. 5 is a partial cross-sectional view for explaining the sandwiching structure of the main board 2. In the main board 2, the boss 1a and the backlash restricting portion 1b of the back cover 1 are fitted into the positioning hole 2a and the notch portion 2b, respectively, and the engagement claw 1c of the back cover 1 and the claw receiving portion 3a of the case 3 are engaged. As a result, it is sandwiched between the back cover 1 and the case, and is elastically pressed and held by a curved leaf spring-like elastic pressing portion 3 f integrally formed on the lower side of the case 3.

  Next, the dials 31 and 32 are attached to the opening (not shown) of the case 3, and the hands 33 to 38 are assembled to the rotation shafts of the driving internal units. As shown in FIG. 5, the dial 32 is attached to the case 3 by fitting a boss 3 e erected on the top of the case 3 into an attachment hole 32 d formed near the outer edge thereof. Although not shown, the dial 31 is also attached in the same manner as the dial 32.

  Next, the facing 4 is placed on the case 3, and the engaging claw 4 a is engaged with the claw receiving portion 3 c of the case 3. Next, the front glass 5 is turned over and placed on the surface 4, and the engaging claw 5 a is engaged with the claw receiving portion b of the case 3. Thereafter, in order to provide the holding strength of the external connector and the LCD module, the screw 29 is inserted into the screw hole 1e and the screw hole 11b of the LCD module 10 from the lower side of the back cover 1, and screwed to the lower surface of the case 3 (not shown). To do.

  As described above, according to the LCD module of the present invention, since the external connector 19 is integrated, the wiring having a large influence of noise such as the power supply and the reset line can be shortened, so that the noise resistance is increased. In addition, there is no need to provide an internal connector for connecting an external signal or power line from the external connector to the CPU, the number of connector poles of the internal connector can be reduced, and a variety of types can be easily handled. .

  Moreover, according to the vehicle display device of the present invention, various vehicle display devices having the LCD module as a common component can be provided.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

  For example, in the above-described embodiment, the internal connector 18 and the external connector 19 are arranged on the same surface of the wiring board 11, but are arranged on different surfaces of the wiring board 11 according to the layout to the vehicle display device. May be.

  In the above-described embodiment, the LCD 13 is mounted on the wiring board 11 that is larger than the LCD 13. Alternatively, the wiring board 11 that is smaller than the LCD 13 may be assembled to the LCD 13.

  The present invention is suitable for a dot matrix type LCD, but can also be applied to other types of LCD such as a segment type LCD.

It is a disassembled perspective view of the display apparatus for vehicles using the LCD module which concerns on embodiment of this invention. (A) And (B) is a perspective view which shows the surface of a LCD module, and a back surface, respectively. 3 is a block diagram showing an electrical configuration of the LCD module 10. FIG. It is a figure explaining the assembly method of the display apparatus for vehicles. It is a fragmentary sectional view explaining the sandwiching structure of the main board in the display for vehicles. It is a disassembled perspective view which shows the structural example of the conventional display apparatus for vehicles. It is a figure which shows the electrical constitution of the display apparatus for vehicles which has the conventional concentrated mounting board | substrate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back cover 1f Opening 2 Main board 3 Case 4 Turn over 5 Front glass 10 LCD module 13 LCD
18 Internal connector 19 External connector

Claims (3)

  An LCD and a wiring board on which the LCD drive circuit is mounted are assembled to each other. The wiring board includes an internal connector for electrically connecting the wiring board to another board, and an electrical device connected to an external device. And an external connector for connecting to the LCD module. The LCD module according to claim 1.
The LCD is housed in an LCD case fixed on the wiring board so that the screen can be viewed from the front of the wiring board, and is disposed on the front surface of the LCD and engaged with the LCD case. An LCD module that is held by a holder. A case, a main board disposed on the back surface of the case and mounted with an internal unit for driving the pointer-type pointing device, a back cover disposed on the back surface of the main board, and a reversal disposed on the front surface of the case And a display device for a vehicle comprising a front glass disposed on the front side of the facing,
The LCD module according to claim 1 or 2 is mounted on the main substrate so that the screen can be seen from the front of the front glass,
The main board and the LCD module are electrically connected by the internal connector,
The vehicle display device, wherein the external connector is disposed so as to be exposed from the back cover through an opening formed in the back cover.

Images