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Drive circuit for eiquid crystal display face-board

A circuit and drive control technology, applied in static indicators, nonlinear optics, instruments, etc., can solve the problems of increasing the scale and cost of integrated circuits

Inactive Publication Date: 2003-08-27
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, the selector with such a large number of transistors occupies a larger portion of the integrated circuit of the data bus driver circuit, which increases the scale and cost of the integrated circuit

Method used

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  • Drive circuit for eiquid crystal display face-board
  • Drive circuit for eiquid crystal display face-board
  • Drive circuit for eiquid crystal display face-board

Examples

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Embodiment Construction

[0031] Embodiments of the present invention will be described below with reference to the drawings. However, the protection scope of the present invention is not limited to the following examples, but is defined by the inventions expressed in the claims of this patent or any equivalents.

[0032] FIG. 1 is a structural diagram of a liquid crystal display device used in this embodiment. The structure in Fig. 1 is as has been described above. Fig. 3 is a schematic structural diagram of a selector used in this embodiment.

[0033] The reference voltages VR0 to VR8 are supplied to the voltage generating circuit 16 . Among these reference voltages, the center level reference voltage VR4 is a common voltage. This voltage generation circuit 16 generates grayscale reference voltages Vr0p to Vr255p on the positive side from reference voltages VR4 to VR7 equal to or greater than the above-mentioned common voltage VR4, and from reference voltages VR0 to VR4 equal to or less than the a...

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PUM

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Abstract

A selector circuit, for selecting and outputting, in accordance with N-bit input data, one gray level reference voltage from 2N gray level reference voltages, comprises: a plurality of select transistor arrays, which are provided in parallel between terminals of the gray level reference voltages and an output terminal and which have a plurality of serially connected transistors that are drive-controlled by the input data, wherein the select transistor arrays are each commonly provided for a group of M (M is a plurality and M<2N) gray level reference voltages among the 2N gray level reference voltages and are made to assume a drive enabled state by means of time division in correspondence with the M gray level reference voltages.

Description

technical field [0001] The present invention relates to a drive circuit for a liquid crystal display panel, particularly a drive circuit in which the scale of a selection circuit having a D / A converter for converting digital display data into an analog drive voltage is reduced. Background technique [0002] The liquid crystal display panel includes a liquid crystal layer serving as a pixel, and the light transmission rate of the liquid crystal layer can be changed by applying a driving voltage corresponding to display data of the pixel to the liquid crystal layer to display gray scales of images. When the image display data consists of 8 bits, 256 gray levels can be displayed, and correspondingly, 256 driving voltages are applied to the pixel electrodes holding the liquid crystal layer therebetween. [0003] FIG. 1 is a structural diagram of a general liquid crystal display device. A display cell array 22 having a liquid crystal layer is provided on the display panel side, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/36
CPCG09G3/2081G09G2310/027G09G3/3688G09G3/2011G09G3/3614G02F1/133
Inventor 鹈户真也熊谷正雄国分政利
Owner FUJITSU LTD