JP2539438Y2 - Liquid crystal display - Google Patents

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, and more particularly, to a liquid crystal display device using a circuit board for mounting a liquid crystal driving circuit.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, as shown in FIG.
4 and connected to the liquid crystal display element 1 by the anisotropic conductive rubber connector 15. The circuit board 14 divides a part of the circuit as a separate board only when all the circuits built in the liquid crystal display device cannot be mounted on one circuit board, and connects the boards with a flexible printed wiring board, a lead wire, or the like. It was connected by a pin header connector. (Not shown)

[0003]

However, in the above-described prior art, a new circuit board must be created for each type of liquid crystal display device to be developed, which is a major obstacle to shortening the development period. In addition, the development costs are enormous, and high-mix low-volume production is not possible. Since the wiring of the circuit board becomes complicated, a wiring error is often overlooked, and there are many problems such as a long time required for checking.

Accordingly, the present invention solves such a problem. The purpose of the present invention is to divide a circuit board into a newly developed part and an existing part, and to only include one newly developed part. Another object is to provide a liquid crystal display device which can be developed as a plurality of circuit boards.

[0005]

According to the present invention, a liquid crystal display device includes a first crystal display element, a plurality of first driving circuit boards each having a driving circuit for driving the liquid crystal display element, and the first driving circuit board.
A first common signal wiring board for connecting each common signal of the first drive circuit board, a plurality of second drive circuit boards including a drive circuit for driving a liquid crystal display element, and the second drive circuit board A second common signal wiring board for connecting each of the common signals, wherein the first common signal wiring board and the front second common signal wiring board are separated from each other, and the first drive circuit
The substrate and the second drive circuit substrate have flexibility, and the common signal wiring substrate is disposed on the back side of the liquid crystal display element.

[0006]

According to the above configuration of the present invention, it is easy to divert a circuit board having the same function of an existing model as it is, and it is not necessary to develop a new circuit board having a specific function. It is not necessary to wire even necessary circuits.

[0007]

FIG. 1 is a rear view showing an arrangement of main parts in the present embodiment. It should be noted that some of the connecting members between the fixing members and the circuit boards are omitted. The liquid crystal panel 1 has a segment line on the upper glass 1a and a lower glass 1b
Are provided with a common line, but the combination may be reversed. A segment drive circuit board 3 on which a segment line drive element 4 is mounted is connected to a terminal provided on the upper glass 1a of the liquid crystal panel 1, and a common line drive element b is mounted on a terminal provided on the lower glass 1b. The common line drive circuit board 5 is connected. Each of the segment drive circuit board 3 and the common drive circuit board 5 has one drive element 4 and one drive element 6 mounted on one board.

FIG. 2 is a diagram showing the common signal wiring boards 9, 10 and the like of the liquid crystal display element shown in FIG.

FIG. 3 is a cross-sectional view of the power supply circuit board 7, the drive circuit control board 8, and the common signal wiring board 9 of FIG. Here, the power supply circuit board 7, the drive circuit control board 8, and the common signal wiring boards 9 and 10 are connected to each other by connection lines 13 as required.

FIG. 4 is a circuit block diagram of the present embodiment. Common signals of the segment drive circuit board 3 and the common drive circuit board 5 are supplied from common signal wiring boards 9 and 10. The power supply circuit board 7 is a circuit board for producing a divided voltage level for driving the liquid crystal, and may include a booster circuit in some cases. The circuit board 8 is a drive circuit control board for controlling the liquid crystal drive elements 6 and 4, and generally includes a liquid crystal controller element and a display data RA.
M and the like. The input / output signal to / from the liquid crystal display device may be extracted from any substrate, but it is convenient to extract the signal from the control substrate 8 or the power supply circuit substrate 7. The power supply circuit and the control circuit may be mounted on the common signal wiring boards 9 and 10. The peripheral circuit is not limited to the power supply circuit and the control circuit, but a necessary circuit may be mounted on an appropriate board and connected to another circuit board. When the peripheral circuit includes only the power supply circuit, the control board 8 is unnecessary, and when the power supply circuit is mounted on the common signal wiring board, the circuit board 7 is unnecessary.

In order to use the same segment drive circuit board or common drive circuit board for different liquid crystal display elements, the terminals of the liquid crystal display element must be unified. Arranging the terminals is not preferable because the wiring resistance inside the liquid crystal display element increases. In particular, when the driving elements are mounted on a circuit board in a chip state, one or two driving elements are desirably mounted on one driving circuit board in view of the mounting yield.

[0012]

As described above, according to the present invention, the common signal wiring can be shared for each model, so that the number of design steps can be reduced and the quality can be stabilized. Further, the first drive circuit board and the second drive circuit board are
The flexible common signal wiring board is on the back side of the liquid crystal display element
The common signal distribution with the drive circuit board
When connecting the line board and the liquid crystal display element, expand each component
Connection at the same time, improving workability in the manufacturing process.
Is above and, when used as a liquid crystal display device, a common
Since the signal wiring board is placed on the back of the liquid crystal display element,
The size of the outer shape of the liquid crystal display device can be reduced.

[Brief description of the drawings]

FIG. 1 is a main rear view showing an embodiment of the liquid crystal display device of the present invention.

FIG. 2 is a development view of the liquid crystal display device of FIG.

FIG. 3 is a cross-sectional view of the liquid crystal display device of FIG.

FIG. 4 is a circuit block diagram of one embodiment of the liquid crystal display device of the present invention.

FIG. 5 is an explanatory diagram of a conventional liquid crystal display.

[Description of Signs] 1 ... Liquid crystal panel 1a ... top glass of liquid crystal panel 1b ... bottom glass of liquid crystal panel 2 ... pressing frame 3 ... segment line drive circuit board 4 ... segment line Driving element 5 ... Common line driving circuit board 6 ... Common line driving element 7 ... Power supply circuit board 8 ... Drive circuit control board 9 ... Common signal wiring base 9 ' , 10' ... Common signal wiring section 11 ... Segment line drive circuit 12 ... Common line drive circuit 13 ... Connection line 14 ... Circuit board 15 ... Conductive rubber

Claims (1)

(57) [Scope of request for utility model registration] A first driving circuit board including a liquid crystal display element, a plurality of first driving circuit boards each including a driving circuit for driving the liquid crystal display element, and a first signal connecting each common signal of the first driving circuit board.
Common signal wiring board, a plurality of second drive circuit boards each having a drive circuit for driving a liquid crystal display element, and a second common signal wiring connecting each common signal of the second drive circuit board and a substrate, and the first common signal wiring board and the second common signal wiring board are separated, the first
The first drive circuit board and the second drive circuit board have flexibility.
A liquid crystal display device, wherein the common signal wiring substrate is disposed on the back side of the liquid crystal display element.