JPH0648541Y2 - Liquid crystal display - Google Patents

Description

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.

[Conventional technology]

In the conventional liquid crystal display device, as shown in FIG. 5, a liquid crystal drive circuit and its peripheral circuits are mounted on one circuit board 14 and are connected to the liquid crystal display element 1 by an 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 or a lead wire. It was connected by a pin header connector, etc. (Illustration omitted) [Problems to be solved by the invention] However, in the above-described conventional technology, a circuit board must be newly created for each model of the liquid crystal display device to be developed, which is a major obstacle to shortening the development period. Has become. In addition, the development cost rises to an enormous amount, which makes it impossible to produce a wide variety of products in small quantities. Since the wiring of the circuit board is complicated, wiring mistakes are often overlooked, and there are many problems such as checking it takes a lot of time.

Therefore, the present invention solves such a problem, and the purpose thereof is to divide a circuit board into a newly developed portion and an existing portion, and only one or a plurality of newly developed portions. The present invention is to provide a liquid crystal display device that can be developed as a circuit board.

[Means for solving problems]

A liquid crystal display device of the present invention connects a liquid crystal display element, a plurality of first drive circuit boards having a drive circuit for driving the liquid crystal display element, and common signals of the first drive circuit board. A first 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 circuit for connecting respective common signals of the second drive circuit board. A signal wiring board, wherein the size of the first and second common signal wiring boards is smaller than the outer shape of the liquid crystal display element, and the first common signal wiring board and the second common signal wiring board are provided. Are separated, and the common signal wiring board is disposed on the back surface of the liquid crystal display element.

[Action]

According to the above configuration of the present invention, it becomes easy to divert a circuit board having the same function of an existing model as it is, and even if a circuit board having a specific function is newly developed, an unnecessary circuit is unnecessary. There is no need to wire up to.

〔Example〕

FIG. 1 is a rear view showing the arrangement of main components in this embodiment. Note that some of the connecting lines between the fixing member and each circuit board are omitted. In the liquid crystal panel 1, the segment lines are provided on the upper glass 1a and the common lines are provided on the lower glass 1b, but the reverse combination is also possible. A segment drive circuit board 3 on which a segment line drive element 4 is mounted is connected to terminals provided on the upper glass 1a of the liquid crystal panel 1,
The common line drive circuit board 5 on which the common line drive element b is mounted is connected to the terminals provided on the lower glass 1b. On the segment drive circuit board 3 and the common drive circuit board 5, one drive element 4 and one drive element 6 are mounted on one board.

FIG. 2 is a common signal wiring board for the liquid crystal display element shown in FIG.
It is a figure which shows a place where 9, 10, etc. are developed on the front side of the liquid crystal panel 1.

FIG. 3 is a view showing a cross section of the power 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 necessary.

FIG. 4 shows a circuit block diagram of this embodiment. The common signal of the segment drive circuit board 3 and the common drive circuit board 5 is supplied from the common signal wiring boards 9 and 10. The power supply circuit board 7 is a circuit board for creating a divided voltage level for driving the liquid crystal, and may include a booster circuit therein. The circuit board 8 is a drive circuit control board for controlling the liquid crystal drive elements 6 and 4, and is generally composed of a liquid crystal controller element, a display data RAM, and the like. Input / output signals to / from the liquid crystal display device may be derived from any substrate, but it is convenient to derive them 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 circuits are not limited to the power supply circuit and the control circuit, and necessary circuits may be mounted on an appropriate board and connected to another circuit board. The control board 8 is unnecessary when the peripheral circuit is only the power supply circuit, and the circuit board 7 is not necessary when the power supply circuit is mounted on the common signal wiring board.

In order to use the same segment drive circuit board or common drive circuit board for different liquid crystal display elements, it is necessary to unify the terminals of the liquid crystal display elements, but one drive circuit board has too many terminals. If it is arranged, the wiring resistance inside the liquid crystal display element increases, which is not preferable. Further, particularly when the drive elements are mounted on the circuit board in a chip state, one or two drive elements are preferably mounted on one drive circuit board in terms of mounting yield.

[Effect of device]

As described above, according to the present invention, since the common signal wiring board can be made common to each model, it is possible to reduce design man-hours and stabilize quality. Furthermore, the first
Since the size of the second common signal wiring board is smaller than the outer shape of the liquid crystal display element and the common signal wiring board is arranged on the back surface of the liquid crystal display element, the liquid crystal display device can be downsized.

[Brief description of 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 sectional view of the liquid crystal display device of FIG. FIG. 4 is a circuit block diagram of an embodiment of the liquid crystal display device of the present invention. FIG. 5 is an explanatory view of a conventional liquid crystal display. 1 ... Liquid crystal panel 1a ... Liquid crystal panel upper glass 1b ... Liquid crystal panel lower glass 2 ... Push frame 3 ... Segment line drive circuit board 4 ... Segment line drive element 5 ... Common line drive circuit board 6 ... Common line drive element 7 Power circuit board 8 Drive circuit control board 9,10 Common signal wiring board 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)

[Scope of utility model registration request] 1. A liquid crystal display element, a plurality of first drive circuit boards comprising a drive circuit for driving the liquid crystal display element, and a first connection circuit for connecting respective common signals of the first drive circuit board. A 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 board for connecting respective common signals of the second drive circuit board And the size of the first and second common signal wiring boards is smaller than the outer shape of the liquid crystal display element, and the first common signal wiring board and the second common signal wiring board are separated from each other. And a common signal wiring board is disposed on the back surface of the liquid crystal display element.