JPH08201840A - Liquid crystal indicator - Google Patents

Abstract

PURPOSE: To provide a liquid crystal indicator with excellent workability and assembly, possible space saving design and more reliable connection between a LCD cell and a wiring board. CONSTITUTION: In a liquid crystal indicator 31 for which a LCD cell 34 is used as an indicating element, a LCD connector 32 consisting of a housing provided with a connection hole and a connector terminal 39 extended into the connection hole is mounted on a wiring board 45 on which electronic parts 47, 49 provided with drive circuits for the liquid crystal indicator 31 is mounted, and a LCD cell 34 is electrically connected to the wiring plate 45 via the connector terminal 39 by inserting a cell terminal 36 consisting of a metal pin connected and fixed to a transparent electrode into the connection hole in the LCD connector 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device which can be applied as an electronic integrated distance display device for displaying the traveling distance of a vehicle.

[0002]

2. Description of the Related Art In a vehicle such as an automobile, various instruments such as a speedometer for displaying the traveling speed of the vehicle and a tachometer for displaying the number of revolutions of an engine mounted on the vehicle are provided.
Some have so-called combination meters attached.

FIG. 13 is an exploded perspective view of the combination meter. The speedometer unit 3 is provided in the meter case 1.
Also, the tachometer unit 5 is mounted. The speedometer unit 3 includes, in addition to the speedometer 7, an electronic integrated distance indicator 9 as a liquid crystal indicator including an LCD cell 2 for displaying the distance traveled by the vehicle.
Implemented in. In the tachometer unit 5, the tachometer 13 is mounted on the wiring board 15.

The speedometer 7 and the tachometer 13 are analog meters having cross-coil type movements 17 and 19 and pointers 21 and 23 that rotate in conjunction with the magnet rotors of the movements 17 and 19, respectively. . Cross-coil movements 17, 19
Is supplied with a drive current according to the vehicle speed or the number of revolutions of the two coils wound around the bobbin so as to cross each other, and the magnetic field generated in the two coils causes
The magnet rotors are rotated together with the hands 21 and 23.

Movement 1 of speedometer 7 and tachometer 13
Electronic components such as a CPU that stores a drive circuit for supplying a predetermined drive current to the coils of 7 and 19 are mounted on the wiring boards 11 and 15, respectively. In addition, electronic components that house the drive circuit of the electronic integrated distance indicator 9 are also mounted on the wiring board 11 of the speedometer unit 3.

At this time, the LCD of the electronic integrated distance indicator 9
The cell 2 and the wiring board 11 are conventionally electrically connected by various connecting methods such as a rubber connector, a pin connector, or a flexible connector.

Here, the rubber connector is a holder in which conductive rubber is interposed between the LCD cell and the wiring board, and is screwed to the wiring board side to hold the conductive rubber in a compressed state through the LCD cell. To achieve electrical connection.

The pin connector is electrically connected by fixing the other end of the pin terminal, which has one end connected and fixed to the transparent electrode of the LCD cell, to the wiring board by soldering.

Further, in the flexible connector, one end side is heat-sealed to the transparent electrode of the LCD cell, and the other end side of the flexible circuit is heat-sealed to the conductive portion on the wiring board side for electrical connection.

[0010]

As described above, in the conventional liquid crystal display, since the LCD cell 2 is a glass product, it is difficult to electrically connect the LCD cell 2 and the wiring board 11 to each other. Although the connection method of FIG. 12 is adopted, the connection method of these methods cannot or cannot be easily attached / detached between the LCD cell 2 and the wiring board 11 once they are connected. When there are variations such as the design A shown in a) and the design B shown in FIG. 12B, the LCD cell 2 and the wiring board 11
The number of sub-assemblies increases with the number of variations of the LCD cell 2, storage and management of the LCD cell 2 become complicated, and workability and assemblability deteriorate.

Further, in the conventional liquid crystal display, the electronic parts are soldered with the LCD cell 2 set in the manufacturing process of the wiring board 11, so that the soldering process becomes complicated, and the work is also performed in this respect. Inferior in assembly and assembling.

Furthermore, the conventional liquid crystal display is large in size and difficult in space-saving design when the rubber connector connection method is adopted, and the connection part is not provided when the rubber connector and flexible connector connection method is adopted. There is also a problem that the reliability of the connection is poor because the connections are not made of metal.

The present invention has been made to solve the above problems, and its purpose is to provide excellent workability and assembly.
An object of the present invention is to provide a liquid crystal display device that can be designed in a space-saving manner and can achieve a connection state with improved reliability.

[0014]

In order to achieve the above-mentioned object, the invention according to claim 1 is a liquid crystal display having an LCD cell as a display portion, and a housing provided with a connection hole,
LC comprising a connector terminal extended in the connection hole
The D connector is mounted on an end portion of a wiring board on which an electronic component having the drive circuit of the liquid crystal display is mounted, and the L connector is mounted on the wiring board.
A CD cell is mounted by inserting a cell terminal made of a metal pin connected and fixed to the transparent electrode into a connection hole of the LCD connector and electrically connected to the wiring board through the connector terminal. It is characterized by being.

The invention according to claim 2 is the liquid crystal display according to claim 1, wherein the LCD connector is mounted on the wiring board together with other mounting components by reflow soldering. I am trying.

Further, the invention of claim 3 is the same as that of claim 1.
Or the liquid crystal display meter according to 2, wherein the LCD cell is provided in a distance accumulator unit that is detachably sub-assembled to the wiring board and is mounted on the vehicle as a display unit for displaying a traveling distance of the vehicle. It is characterized by that.

[0017]

Since the invention according to claims 1 to 3 has the above-mentioned structure, it has the following effect.

That is, according to the first aspect of the present invention, the LCD cell can be easily connected to the wiring board by inserting the cell terminal of the LCD into the LCD connector mounted on the wiring board, and the LCD cell can be easily connected. Even if there is a variation in the display design of, the same type of wiring board (with LCD connector) is commonly used for LCD cells with different display designs by matching the electrode terminals of the LCD cells. Can be used.

Further, according to the first aspect of the invention, since the LCD connector and the electronic component are mounted on the wiring board by soldering without the LCD cell, the soldering step is facilitated.

Further, according to the first aspect of the invention, the electrical connection between the LCD cell and the wiring board can be achieved even if the insertion depth of the cell terminal of the LCD cell into the LCD connector is made as shallow as possible. The cell terminal is shortened and the connection hole of the LCD connector is made shallow to enable a space-saving design, and the cell terminal is a metal pin, so that the cell terminal and the connector terminal are connected by a metal portion. The above reliability can be improved.

According to the second aspect of the invention, the LCD connector can be mounted on the wiring board by one reflow soldering together with other mounting components.

Further, according to the third aspect of the present invention, since the LCD cell is provided in the distance accumulator unit which is detachably sub-assembled to the wiring board and mounted on the vehicle, the distance accumulator unit is easy to assemble and work. In addition to being able to improve the efficiency, it is possible to realize a space-saving design and to make the connection between the LCD cell and the wiring board reliable.

[0023]

The present invention will be described in detail below with reference to the illustrated embodiments.

1 and 2 show a wiring board assembly 30 incorporated in a distance accumulator unit 33 as one embodiment.

In this wiring board assembly 30, an LCD cell 34, which serves as a display portion of an electronic integrated distance display 31 as a liquid crystal display, has its cell terminals 36 mounted on the front end surface of a wiring board 45. It is configured by being inserted and connected to the wiring board 32 and being attached to the front end portion of the wiring board 45 so as to be perpendicular to the wiring board 45.

On the wiring board 45, in addition to the LCD connector 32, a driving circuit for driving the electronic distance integrating indicator 31, driving circuits for a speedometer and a tachometer are stored. , And the non-volatile memory IC 49 are mounted as electronic parts, and a switch 71 for switching the display (odd-trip switching and resetting at trip) of the LCD cell 34 in the electronic distance integration display 31 is mounted. Has been done.

The non-volatile memory IC 49 is EE in this case.
It is a PROM, and stores two types of integrated travel distance values: an integrated value of travel distance as an odometer and an integrated value of travel distance as a trip meter.

As shown in FIGS. 3 and 4, the LCD connector 32 has a housing 37 formed in an elongated rectangular parallelepiped shape along the front edge of the wiring board 45, and a housing 37 opened at the front surface 37a of the housing 37. It is composed of a plurality of connection holes 38 formed in the width direction and a plurality of connector terminals 39 extended and provided in each connection hole 38. The metal fittings 40 provided on both sides of the housing 37 in the longitudinal direction are metal fittings for temporary attachment when the LCD connector 32 is mounted on the wiring board 45.

As shown in FIG. 5, the connector terminal 39 has a contact projection 39 whose one end side is folded back in a U shape in the connection hole 38.
The connecting end 39b is an elastic piece 39a having c, and the other end side is drawn outward from the rear side of the housing 37 and connected to the drive circuit of the electronic integrated distance indicator 31 mounted on the wiring board 45. Has become.

The LCD connector 32 is provided with the metal fitting 4
It is temporarily fixed to the wiring board 45 by using 0 and is mounted on the wiring board 45 by one reflow soldering together with other electronic components 47 and 49. This soldering process is L
Since the operation is performed without the CD cell 34, it is simplified.

On the other hand, the LCD cell 34 comprises the windshield 3
4a and the rear glass 34b are joined together by using an appropriate joining agent to form a normal liquid crystal display element, and the cell terminal 36 has a U-shaped fitting portion 36a formed on one end side as shown in FIG. It is made of a metal pin and is connected to the transparent electrode 42 of the LCD cell 34 by fitting the fitting portion 36a to the end edge portion 34c of the rear glass 34b, and the epoxy resin 44 is applied to the connection portion from above. Then, by fixing the connection state, the LCD cell 34 is mounted at a substantially right angle. This cell terminal 36 is L
A plurality of CD connectors 32 are attached in correspondence with the pitch intervals of the plurality of connection holes 38.

As shown in FIG. 5, the LCD cell 34 has its cell terminal 36 inserted into the connection hole 38 of the LCD connector 32 while bending the elastic piece 39a, and the cell terminal 36 is brought into contact with the elastic piece 39a. The protrusion 39c is attached to the LCD connector 32 in a state of being in contact with the protrusion 39c to form the wiring board assembly 30.

In this wiring board assembly 30, the LCD
The cell 34 is electrically connected to the collective driving IC 47 mounted on the wiring board 45 through the connector terminal 39.

As described above, the wiring board assembly 30 includes the wiring board 4
By inserting the cell terminal 36 of the LCD cell 34 into the LCD connector 32 mounted in FIG.
Can be easily connected to the wiring board 45, and
Even when there are variations in the display design of the CD cell 34 (see FIGS. 12A and 12B), by matching the electrodes of the cell terminals 36 of different LCD cells 34 having different display designs, Different LCD cell 34
However, one type of wiring board 45 (including the LCD connector 32) can be commonly used, and an electronic total distance indicator 31 as a liquid crystal indicator with excellent assembling and workability is provided.
Can be provided.

In addition, the wiring board assembly 30 provides an electrical connection between the LCD cell 34 and the wiring board 45 even if the insertion depth of the cell terminal 36 of the LCD cell 34 into the LCD connector 32 is made as shallow as possible. For example, the pin length of the cell terminal 36 can be set to 5 mm, and the connection hole 38 of the LCD connector 32 can be set to a depth of 6 mm, which enables a space-saving design of the electronic integrated distance indicator 31.

Further, in the wiring board assembly 30, since the connector terminal 39 and the cell terminal 36 are in contact with the metal portion, the reliability of connection can be improved.

Then, the wiring board assembly 30 is incorporated into the distance integrating unit 33 as shown in FIG.

That is, in the single case 43, the case main body 74 of the single case 43 is opened over the entire lower portion in the drawing, the wiring board assembly 39 is set from this opening side, and the wiring board 45 is fixed by the tapping screw 75. It LCD cell 3 of electronic distance integration indicator 31 in a fixed state
4 is aligned with the rectangular opening 77 formed in the front surface 76 of the case body 74.

A circular opening 79 is formed on the side of the opening 77 in the front surface 76 of the case body 74, and the rear end of the switch 79 on the wiring board 45 comes into contact with the opening 79 for operation. The front end side of the possible knob 81 projects. Knob 8
The knob 81 is provided in the case main body 74 at the position where 1 is arranged.
The leaf spring 83 for returning the knob 81 from the state in which the rear end is brought into contact with the switch 71 by pressing from the front end side.
Has been fixed. The leaf spring 83 has an L-shaped cross section, and one surface 85 is fixed to the inner wall of the case main body 74, while the other surface 87 is formed with a U-shaped notch 87a, and the knob 81 is provided in the notch 87a. Is inserted. Knob 81
The front surface 76 of the case body 74 and the surface 87 of the leaf spring 83.
A large-diameter portion 81a is formed in a portion located between and, and the surface 87 of the leaf spring 83 is pressed by the large-diameter portion 81a.

The case body 74 is open to the entire area on the rear end side, and a rear case 89 serving as a terminal case is attached to this open portion. Mounting flanges 91 are provided on both ends of the back case 89, and mounting flanges 93 are also provided on the case body 74 in the same manner. Using these mounting flanges 91 and 93, a meter case 95 in FIG. A distance accumulator unit 33 is attached.

A plurality of grooves 96 are formed in the rear case 89 except the central portion, and the contact pins 67 are fitted in the grooves 96. The contact pin 67 has an upper end 67 a and a lower end 67 b protruding from the upper surface and the lower surface of the rear case 89, respectively. Contact pin 67
The lower end 67b of the distance accumulator unit 33 is always in elastic contact with the conductive portion 73 of the wiring board 45 when the distance accumulator unit 33 is assembled, and the upper end 67a of the distance accumulator unit 33 is attached to the meter case 95. Then, the FP in FIG. 8 described later.
It elastically contacts the conductive portion 69 of C25.

At the center of the rear case 89, there is formed an insertion hole 99 into which a bulb 97 for backlighting the LCD cell 34 of the electronic distance integrating indicator 31 is inserted. The valve 97 is inserted into the insertion hole 99,
The FPC 25 is fixed to the valve mounting portion 101 (see FIG. 8) formed in the central portion of the conductive portion 69. In addition, L of the electronic distance integration indicator 31 in the case body 74
A diffuser plate 102 is arranged behind the CD cell 34, and the illumination light of the bulb 97 is displayed on the LCD of the electronic distance integrating indicator 31.
The cells 34 are arranged so as to be evenly distributed over the entire cell.

Next, the overall configuration of the combination meter will be described with reference to FIG. Conductor 6 of FPC25
A rectangular through hole 103 into which the distance integrator unit 33 is inserted is formed in the meter case 95 at a portion facing the valve mounting portion 101 and the valve mounting portion 101. This through hole 10
3, the conductive portion 69 of the FPC 25 and the valve mounting portion 10
The FPC 25 is fixed to the rear surface of the meter case 95 with the screw 105 in the state where 1 is aligned.

The conductive part 69 and the valve mounting part 101.
Each of the lower end portion and both side portions of the FPC 25 are separated from the main body of the FPC 25, and only the upper end portion of the FPC 25 is separated.
Is connected to the main body of the. For this reason, when the distance accumulator unit 33 is attached to the meter case 95, the distance accumulator unit 33 pushes away the conductive portion 69 and the valve attachment portion 101 of the FPC 25 and the through hole 103.
Then, the mounting flanges 91 and 93 are used for fixing with screws 107. In this state, the conductive portion 69 is located on the upper surface of the distance accumulator unit 33 and is located on the contact pin 6
7, the valve mounting portion 101 is pulled out rearward, positioned behind the distance accumulator unit 33, and aligned with the insertion hole 99 of the rear case 89.

On the surface of the meter case 95 opposite to the FPC 25, the movements 35 and 37 of the speedometer 27 and the tachometer 29, as well as the cross coil type movements 109 and 111 of the fuel gauge and the thermometer are shown. The screws that are not provided are screwed in and fixed from the back side of the FPC 25, respectively. In this case, by using a conductive screw, the conductive part connected to the coil of each movement 35, 37, 109, 111 and the conductive part on the FPC 25 side can be electrically connected.

Each movement 35, 37, 109, 11
1 is a pointer shaft 113, 1 for each magnet rotor
15, 117, 119 are fixed, and pointer shafts 113, 11
At the tips of 5, 117, 119, pointers 39, 41, 121,
123 are attached respectively. Dial 125,12
7, 129, 131 are the pointer axes 113, 115, 11
7, 119 are penetrated, and are attached to the meter case 95 from the front side by screws (not shown).

On the front side of the meter case 95, there is a back cover 1
33 is attached, and the dial 133 is attached to the dial 133.
Opening holes 135, 13 aligned with 27, 129, 131
7, 139, 141 are formed and the opening hole 1 is aligned with the display surface of the electronic distance integrating indicator (LCD) 31.
43 is formed. A front glass 145 is attached to the front side of the dial 133. Circular through holes 147 and 14 are formed in the facing sheet 133 and the front glass 145.
9 is formed, and the knob 81 of the distance integrator unit 33 is inserted into the through holes 147 and 149, and the front glass 1
It is in a state of projecting forward of 45.

9 to 11 show L as another embodiment.
A CD connector 150 is shown.

The LCD connector 150 is of a type that is mounted upright on the wiring board 45, and has an elongated cubic housing 155 and the housing 155.
A plurality of connection holes 151 that have an opening 151a on the upper surface thereof and project in the vertical direction, connector terminals 152 that extend into the connection holes 151 and project downward from the lower portion of the housing 155, and both sides of the housing 155. It also has a positioning pin 153 which is provided so as to project downward in the above-mentioned structure.

At this time, the connector terminal 152 has the connection hole 1
A portion inside 51 is an elastic connection portion 152a bent and formed in a U shape in which the opening 151a side of the connection hole 151 is opened, and a portion protruding downward is a pin shape connected to the lower end of the elastic connection portion 152a. Of the connection end 152b.
Further, the upper portion of the elastic connecting portion 152a is formed with a piece of a U-shaped piece having a contact protrusion 152d that protrudes inward of the U-shape, and is located above the contact protrusion 152d. Both pieces are formed on an inclined surface 152c that is inclined so as to open obliquely upward.

The LCD connector 15 formed in this way
0 is a positioning hole (not shown) provided in the wiring board 45 and a positioning pin 1 in the terminal insertion hole 45a.
53 and the connecting end 152b are inserted, and the connecting end 1
52b by reflow soldering 156
The electronic integrated distance indicator 31 mounted on the wiring board 45 is connected to and attached to the distance circuit.

LCD connector 1 mounted in this way
In order to connect the above-mentioned LCD cell 34 to 50, the cell terminal 36 is connected to the connection hole 151 by bending the contact protrusion 152d so as to be located in the U-shape of the elastic connection portion 152a.
It is carried out by inserting it inside (see FIG. 11). At this time, the insertion of the cell terminal 36 is easily performed by being guided by the inclined surface 152c, and after the insertion, the cell terminal 36 is connected by being sandwiched by the elastic connecting portions 152a from both sides, so that the reliability is further improved. The connected state is obtained.

In this way, the LCD cell 34 is replaced by the LCD cell 34.
The electronic total distance indicator as a liquid crystal indicator obtained by connecting to the connector 150 can improve the assembling property and workability and can save space as in the above-described embodiment.

[0054]

As described in detail above, the present invention has the following effects.

That is, according to the first aspect of the invention, the LCD cell can be easily connected to the wiring board by inserting the cell terminal of the LCD cell into the LCD connector mounted on the wiring board. Even if there are variations in the display design of the above, it is possible to commonly use one type of wiring board for LCD cells of different display designs by matching the electrode terminals of the LCD cells. Since the LCD connector and the electronic components are mounted on the wiring board by soldering in the absence of cells, the soldering process is facilitated, thereby providing a liquid crystal display excellent in workability and assembly. can do.

Moreover, according to the first aspect of the invention, L
Even if the insertion depth of the cell terminal of the CD cell into the LCD connector is made as shallow as possible, the electrical connection between the LCD cell and the wiring board can be achieved, so that the cell terminal is shortened and the LCD
Space-saving design is possible by making the connection hole of the connector shallow, and the cell terminals are made of metal pins, so the contact between the metal parts of the terminals and the connector terminals improves the reliability of the connection. A liquid crystal display that can be provided.

According to the second aspect of the invention, the connector can be mounted on the wiring board by one reflow soldering together with other mounting components. Therefore, the effect of the first aspect of the invention can be achieved. In addition, it is possible to provide a liquid crystal display meter with further improved workability and assembly.

Further, according to the invention described in claim 3, the assembling property and workability of the distance integrating unit can be improved, and the space saving design can be realized, and the LCD can be realized.
It is possible to provide a liquid crystal display that can make the connection between the cell and the wiring board reliable.

[Brief description of drawings]

FIG. 1 is a plan view of a wiring board assembly incorporated in a distance accumulator unit as one embodiment.

FIG. 2 is a side view taken along arrow A in FIG.

3 is a plan view of an LCD connector mounted on the wiring board assembly of FIG. 1. FIG.

FIG. 4 is a side view taken along the arrow B of FIG.

5 is an enlarged cross-sectional view of a main part taken along the line VV of FIG.

6 is a perspective view of relevant parts for explaining a connection state of cell terminals of the LCD cell of FIG.

7 is an exploded perspective view of a distance accumulator unit in which the wiring board assembly of FIG. 1 is incorporated.

8 is an exploded perspective view of an entire combination meter in which the distance accumulator unit of FIG. 7 is incorporated.

FIG. 9 is a plan view of an LCD connector as another embodiment.

10 is a side view taken along the arrow C in FIG.

11 is an enlarged cross-sectional view of an essential part showing a state where the LCD connector of FIG. 9 is attached to a wiring board.

FIG. 12 (a) shows a display design of an LCD cell,
(B) shows another display design of the LCD cell.

FIG. 13 is an exploded perspective view of a combination meter showing a conventional example.

[Explanation of symbols]

 31 Electronic Integrated Distance Indicator (Liquid Crystal Display) 32 LCD Connector 33 Distance Accumulator Unit 34 LCD Cell 36 Cell Terminal 37 Housing 38 Connection Hole 39 Connector Terminal 42 Transparent Electrode 45 Wiring Board 47 Batch Drive IC (Electronic Parts) 49 Non-volatile memory (electronic parts)

Claims (3)

[Claims] 1. A liquid crystal display device having an LCD cell as a display unit, wherein an LCD connector comprising a housing provided with a connection hole and a connector terminal extending into the connection hole is a drive circuit for the liquid crystal display device. The LCD cell is mounted on an end portion of a wiring board having an electronic component mounted thereon, and the LCD cell is inserted into a connection hole of the LCD connector by inserting a cell terminal formed of a metal pin connected and fixed to a transparent electrode thereof. And a liquid crystal display meter electrically connected to the wiring board via the connector terminal. 2. The liquid crystal display according to claim 1, wherein the LCD connector is mounted on the wiring board together with other mounting components by reflow soldering. 3. The liquid crystal display meter according to claim 1, wherein the LCD cell is a subassembly detachably attached to the wiring board and mounted on a vehicle as a display unit for displaying a traveling distance of the vehicle. A liquid crystal display meter characterized by being provided in a meter unit.