JPH10170889A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device that is constituted so that gradation resistance components, whose settings are required to be change severely as specifications of the driving voltage, liquid crystal material, etc., of a liquid crystal display element are changed, can freely be detached from or attached to a wiring substrate. SOLUTION: This liquid crystal display device includes the liquid crystal display element 10, and a circuit board 2 for mounting a driving circuit 12, which drive the liquid crystal display element 10 and a controller 13, which supplies different kinds of source voltage and signal to the respective driving circuits. In this case, a connector 4 which connects terminals is provided on the circuit board, and it is made possible to attach and detach the substrate 1 on which resistance components for gradational display are mounted through a connector 4.

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 gradation resistor component whose setting is strictly required to be changed in response to a change in specifications of a driving voltage of a liquid crystal display element and a liquid crystal material. The present invention relates to a liquid crystal display device detachable from a liquid crystal display.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, as shown in a plan view of FIG. 4A and a side view of FIG. 4B, plural kinds of power supply voltages and signals are supplied to a plurality of driving circuits for driving a liquid crystal display element. A plurality of resistance components 3 for gradation display are directly mounted on a circuit board 2 on which a controller to be supplied is mounted.

[0003]

The gradation resistance component of the liquid crystal display device differs from other components when the driving voltage for driving the liquid crystal display element is changed or the liquid crystal material is changed. Often it has to be changed. The gradation resistor (part) divides a predetermined voltage for gradation display, but the individual resistance value and the division ratio are slightly different depending on the voltage width of the liquid crystal driving voltage and the properties of the liquid crystal material. It is.

However, a large number of components other than the gray scale resistor are mounted on the circuit board, and only the gray scale resistor is changed due to a change in the circuit area of the gray scale resistor due to a change in the resistance value. Therefore, the layout of the entire circuit board may be changed. In addition, in order to cope with future changes in the liquid crystal drive voltage, liquid crystal material, etc., multiple sets of gradation resistance parts are prepared on the circuit board, and the gradation resistance parts to be selectively used by switching with electric signals are controlled. Although it is conceivable to provide a switching switch on the circuit board, it is uneconomical to provide such a margin, and there is a limit in predicting future changes.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device in which a gradation resistance component whose setting is strictly required to be changed in response to a change in the specification of a driving voltage of a liquid crystal display element or a liquid crystal material is detachable from a wiring board. It is to provide.

[0006]

In order to achieve the above object, a liquid crystal display device to which the present invention is applied comprises a liquid crystal display element, a plurality of driving circuits for driving the liquid crystal display element, and a plurality of types of driving circuits. A liquid crystal display device comprising: a circuit board on which a controller for supplying a power supply voltage and a signal is mounted; and a connector for connecting a plurality of terminals on the circuit board; The board on which the components are mounted is detachable via the connector.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 5, a plurality of driving circuits 12 (driving IC chips) for driving a liquid crystal display element are provided around a liquid crystal display element 10 by a tape automated bonding method. TAB)
Carrier package 11 (TCP) and this TCP1
1 and a circuit board 2 connected to the liquid crystal display element 10 via the liquid crystal display element 10. A controller 13 for supplying a plurality of types of power supply voltages and signals to each drive circuit 12 is mounted on the circuit board 2, and a gray scale resistance board 1 for gray scale display is connected to the circuit board via a connector described later in the vicinity thereof. Is done.

FIG. 1A is an enlarged plan view of a portion of the gradation resistance substrate 1, and FIG. 1B is a side view. As described above, the plurality of gradation resistance elements 3 are mounted on the gradation resistance substrate 1, and the inter-substrate connector 5 is provided on the back surface of the gradation resistance substrate. Terminals for a voltage (for example, a maximum voltage and a minimum voltage) and an output divided power supply voltage (for example, a six-stage intermediate power supply voltage for gradation display) are provided.

On the other hand, the board-to-board connector 5 and the detachable board-to-board connector 4 are provided on the circuit board 2. For example, preferably, the board-to-board connector 4 is female (female)
It is a connector, and the inter-board connector 5 is a male (male) connector, but either male or female may be used.

FIG. 2A is a plan view showing the vicinity of the board connector 4 where the gradation resistance board 1 is removed, and FIG. 2B is a side view. As shown in the figure, the board connector 4 has a rectangular shape provided at the center of the gradation resistance board 1, but in order to further improve the connection stability, as shown in FIG. The connector part may be separated into two parts.

FIG. 3A is a plan view of the gradation resistance substrate 1, FIG. 3B is a side view, and FIG. 3C is a rear view. As shown in the figure, the board-to-board connector 5 is a male connector having a protruding shape. When the board connector 4 has the shape shown in FIG. 2C, the board connector 5 is also separated into two parts as shown in FIG. 3D. 2 and FIG.
The electrode terminals in (5) and (5) are arranged so that the potential difference between adjacent electrodes is as small as possible.

[0012]

According to the present invention, it is possible to detachably attach a gradation resistance component whose setting is strictly required to be changed in response to a change in the specification of the driving voltage of the liquid crystal display element, the liquid crystal material, etc., from the wiring board. It is easy to change the specifications of the circuit board according to the change of the specifications of the liquid crystal display element.

[Brief description of the drawings]

FIG. 1A is a plan view and FIG. 1B is a side view showing a connection state between a gradation resistance substrate and a circuit board according to the present invention.

2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a plan view of another modified example of a circuit board in the vicinity of an inter-board connector according to the present invention.

FIG. 3A is a plan view of a gradation resistance substrate according to the present invention,
(B) is a side view, (c) is a rear view, and (d) is a rear view of another modification.

4A is a plan view and FIG. 4B is a side view of a circuit board and a gray scale resistor arranged near a conventional liquid crystal display element.

FIG. 5 is a schematic plan view of the liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gradation resistance board, 2 ... Circuit board, 3 ... Gradation resistance, 4 ...
Board-to-board connector (female), 5 ... board-to-board connector (male), 1
0: liquid crystal display element, 11: tape carrier package (TCP), 12: drive circuit (drive IC chip), 13
…controller.

Continued on front page (72) Inventor Shiro Ueda 3300 Hayano, Mobara-shi, Chiba Prefecture Hitachi, Ltd. Electronic Device Division

Claims (1)

[Claims] 1. A liquid crystal display device including a liquid crystal display element, a circuit board on which a plurality of drive circuits for driving the liquid crystal display element and a controller for supplying a plurality of types of power supply voltages and signals to each drive circuit are mounted. A liquid crystal display having a connector for connecting a plurality of terminals on the circuit board, and a board on which a resistive component for gradation display is mounted is detachable via the connector. Display device.