JP2711184B2 - Semiconductor integrated circuit device for driving liquid crystal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor integrated circuit device for driving a liquid crystal, which is generally provided in a predetermined arrangement with respect to the liquid crystal panel in order to drive an active matrix type liquid crystal panel.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional active matrix type liquid crystal panel and its peripheral circuits.

In FIG. 1, a plurality of liquid crystal driving semiconductor integrated circuit elements 21 are provided in a predetermined arrangement around an active matrix type liquid crystal panel 100, and are connected to the liquid crystal panel 100 by a wiring section 22. I have. The video signal drive circuit 24 converts the impedance of the video signal based on the control of the control unit 25, amplifies the signal if necessary, supplies the amplified signal to each liquid crystal drive semiconductor integrated circuit element 21, and receives the received liquid crystal drive semiconductor integrated circuits. The circuit element 21 drives the liquid crystal panel 100 based on the converted signal, and an image corresponding to the video signal is displayed on the liquid crystal panel 100.

FIG. 4 shows the configuration of a semiconductor integrated circuit device 21 for driving a liquid crystal. The liquid crystal driving semiconductor integrated circuit element 21 includes a large number of liquid crystal driving circuits 211, and the video signal output from the video signal driving circuit 24 is input to each liquid crystal driving circuit 211 through a video signal input terminal 212, and each liquid crystal driving circuit 211 The output of 211 is given to the liquid crystal panel 100 through the liquid crystal drive output terminal 213.

[0005]

Generally, in a liquid crystal display device, there is a demand for improvement of image quality and enlargement of a displayed image. In order to meet this demand, a video signal driving circuit as described above
24. In a liquid crystal panel driving device including the liquid crystal driving semiconductor integrated circuit element 21 and the like, it is important to cope with an increase in the frequency of a video signal and an increase in the size of the liquid crystal panel.

However, in the above-described conventional liquid crystal panel driving device, the video signal is subjected to impedance conversion collectively by the video driving circuit 24, amplified if necessary, and output to each liquid crystal driving semiconductor integrated circuit element 21. . Then, the liquid crystal driving semiconductor integrated circuit element 21 takes in the input video signal as it is and supplies it to each liquid crystal driving circuit 211. Therefore, all of the liquid crystal driving circuits 211 of each of the liquid crystal driving semiconductor integrated circuit elements 21 become loads on the video signal driving circuit 24, and as the size of the liquid crystal panel 100 increases or the frequency of the video signal increases, Video signal drive circuit
The load of 24 increases, and the video signal deteriorates, making it difficult to maintain image quality.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has been made in view of the above-mentioned problems. It is an object to provide a semiconductor integrated circuit device.

[0008]

Liquid crystal driving semiconductor integrated circuit device of the present invention, in order to solve the problems] In order to achieve the above-mentioned problems, an active matrix plurality is a liquid crystal driving semiconductor integrated circuit for driving a liquid crystal panel An element,
Each liquid crystal driving semiconductor integrated circuit device includes a plurality of liquid crystal driving circuit for driving the liquid crystal panel for each pixel, video
A signal input terminal, provided for each video signal input terminal,
From the outside through the video signal input terminal an input video signal in common to said plurality of liquid crystal driving circuit is converted into a signal for driving the liquid crystal driving circuit applied to each of the plurality of liquid crystal driving circuit, The video signal input terminals and the same number of video signal amplifier circuits are internally provided.

[0009]

According to the present invention, each of the plurality of liquid crystal driving semiconductor integrated circuit elements provided on the liquid crystal panel includes a plurality of liquid crystal driving circuits, a video signal input terminal, and a video signal input terminal.
And from the outside via the video signal input terminal
A video signal input in common to said plurality of liquid crystal driving circuit is converted into a signal for driving the liquid crystal driving circuit applied to the respective liquid crystal driving circuit of the multi <br/> number, the video signal input
And the same number of video signal amplifier circuits as the number of input terminals . Thus, for each liquid crystal driving semiconductor integrated circuit device, since so as to drive the liquid crystal drive circuit is provided the number of video signal amplifier circuit is equal to the number of the input video signal,
Even if the total number of necessary liquid crystal driving circuits increases as the size of the liquid crystal panel increases and the number of pixels increases, the load on the video signal driving circuit is still reduced by the video signal amplifying circuit built in the liquid crystal driving semiconductor integrated circuit device. Since only driving is required , the increase is not so large, and the video signal is not degraded. Sand
That is , unlike the conventional example, the load on the video signal drive circuit that supplies the video signals to all of the plurality of liquid crystal drive circuits does not increase the load on the video signal drive circuit. In addition, due to the sharing of functions of the video signal driving circuits, the video signals can be displayed without significantly increasing the circuit scale of the semiconductor integrated circuit element for driving the liquid crystal as compared with the case where the same number of video signal amplifier circuits as the number of the liquid crystal driving circuits are provided. Higher signal frequencies can be easily handled.

As a result, even if the size of the liquid crystal panel becomes large or the video signal has a high frequency, the deterioration of the video signal can be appropriately prevented.

The following examples of the present invention will clarify such an operation of the present invention, and further clarify other operations of the present invention.

[0012]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a liquid crystal driving semiconductor integrated circuit device according to an embodiment of the present invention. FIG. 2 is a diagram showing an active matrix type liquid crystal panel provided with a plurality of liquid crystal driving semiconductor integrated circuit devices of FIG. This shows the situation.

In FIG. 1, a liquid crystal driving semiconductor integrated circuit device 10 includes a large number of liquid crystal driving circuits 11, and is constituted by, for example, an LSI (Large Scale Integrated Circuit).

In FIG. 2, a plurality of semiconductor integrated circuit elements 10 for driving a liquid crystal shown in FIG. 1 are provided in a predetermined arrangement around a liquid crystal panel 100 of an active matrix system. It is connected.

In FIG. 1, the liquid crystal driving semiconductor integrated circuit device 10 further includes three video signal input terminals 12 and a number of liquid crystal driving output terminals 13. The output of each liquid crystal drive circuit 11 is provided to a liquid crystal panel 100 through a liquid crystal drive output terminal 13. Here, the liquid crystal driving semiconductor integrated circuit element 10
Is a conventional liquid crystal driving semiconductor integrated circuit device 21 shown in FIG.
Unlike the above, it is configured to include the video signal amplifier circuit 15 therein. That is, the video signal input from the video signal input terminal 12 is given to each of the three video signal amplifier circuit portions 15a, where it is amplified and output to each liquid crystal drive circuit 11.

Therefore, when the liquid crystal driving semiconductor integrated circuit device 10 configured as described above is used, the liquid crystal panel
Even if the total number of necessary liquid crystal drive circuits 11 increases with the increase in the size of 100 and the number of pixels thereof, each video signal amplifying circuit 15 can be increased by increasing the total number of the liquid crystal drive semiconductor integrated circuit elements 10. Therefore, the load on the video signal drive circuit 24 is greatly reduced. As in the conventional example shown in FIG. 4, the video signal does not deteriorate due to an increase in the load of the video signal driving circuit 24 for supplying the video signal to all of the plurality of liquid crystal driving circuits 211. In addition, by sharing the functions of the video signal driving circuit, it is possible to easily cope with a higher frequency of the video signal, and it is possible to supply a stable video signal.

[0018]

[Effect of the Invention] As described above in detail, according to the present invention, each liquid crystal driving semiconductor integrated circuit device, the video signal
The same number of video signal amplifier circuits as the number of signal input terminals are provided to drive the liquid crystal drive circuit, so the total number of necessary liquid crystal drive circuits increases with the size of the liquid crystal panel and the number of pixels. However, as long as the total number of the liquid crystal driving semiconductor integrated circuit elements is increased, the video signal is not degraded because the functions are shared among the video signal amplifier circuits. Furthermore, by the function sharing of the video signal drive circuit,
Compared to the case where the number of video signal amplifying circuits equal to the number of each liquid crystal drive circuit is provided, it is possible to easily cope with the high frequency of the video signal without increasing the circuit scale of the semiconductor integrated circuit element for driving the liquid crystal. it can.

As a result, even if the size of the liquid crystal panel becomes large or the video signal becomes a high frequency, the deterioration of the video signal can be appropriately prevented. , A liquid crystal display device having a high image quality and a large screen can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a liquid crystal driving semiconductor integrated circuit device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an active matrix type liquid crystal panel provided with a plurality of the liquid crystal driving semiconductor integrated circuit elements of FIG. 1;

FIG. 3 is a schematic configuration diagram showing a conventional active matrix type liquid crystal panel and its peripheral circuits.

FIG. 4 is a block diagram showing the liquid crystal driving semiconductor integrated circuit device of FIG. 3;

[Explanation of symbols]

 10 LCD drive semiconductor integrated circuit device 11 LCD drive circuit 12 Video signal input terminal 13 LCD drive output terminal 15 Video signal amplifier circuit 22 Wiring section 100 LCD panel

Claims (1)

(57) [Claims] 1. A liquid crystal driving semiconductor integrated circuit element provided for driving an active matrix type liquid crystal panel, wherein each of the liquid crystal driving semiconductor integrated circuit elements drives the liquid crystal panel for each pixel. A plurality of liquid crystal drive circuits, a video signal input terminal, and the video signal input
The video signal input terminal is provided for each terminal.
Converting the video signal commonly input to the plurality of liquid crystal driving circuits through the liquid crystal driving circuit into a signal for driving the liquid crystal driving circuit, and applying the signal to each of the plurality of liquid crystal driving circuits.
A semiconductor integrated circuit element for driving a liquid crystal, comprising a signal input terminal and the same number of video signal amplifier circuits inside.