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Liquid crystal driving circuit and liquid crystal display apparatus equipped with the same

A technology for a liquid crystal driving circuit and a liquid crystal display device, which is applied to static indicators, instruments, etc., can solve the problems of not mentioning the generation of multiple grayscale voltages, not mentioning the reduction of power consumption, and having no effect, and achieves low cost. , The effect of reducing the number of components and reducing the area

Inactive Publication Date: 2007-09-05
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this technology does not play a role in the miniaturization of ICs for driving liquid crystal display devices.
[0019] In addition, the same as the previous example, there is no mention of the part that generates multiple grayscale voltages, nor does it mention the technology of reducing power consumption

Method used

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  • Liquid crystal driving circuit and liquid crystal display apparatus equipped with the same
  • Liquid crystal driving circuit and liquid crystal display apparatus equipped with the same
  • Liquid crystal driving circuit and liquid crystal display apparatus equipped with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] Embodiments of the present invention will be described below with reference to the drawings.

[0053] First, a configuration example of a panel portion of an FSC drive type liquid crystal display device driven by the liquid crystal drive circuit of the present invention will be described with reference to FIGS. 2 to 7 .

[0054] FIG. 2 is a schematic cross-sectional view showing an example of a panel portion of the liquid crystal display device.

[0055] In FIG. 2, an upper transparent substrate 14 and a lower transparent substrate 18, each made of transparent glass or resin, are bonded at predetermined intervals through a sealing material 15, and a liquid crystal layer 16 is enclosed and sandwiched in the gap. The polarizer 12 is attached to the upper surface of the side transparent substrate 14 , and the polarizer 20 is attached to the lower surface of the lower transparent substrate 18 , thereby forming the liquid crystal display unit 10 .

[0056] On the inner surf...

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PUM

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Abstract

Low cost and low power consumption are achieved in a circuit part for generating a gradation voltage of a liquid crystal drive circuit. A gradation voltage generating circuit (78) is provided with a gradation voltage generating part (88) for generating a plurality of gradation voltages for gradation display by a pixel of a liquid crystal display part; a source-follower connected transistor group (90) for impedance conversion of each of the gradation voltages; and an analog switch part (94) which selects an output of the transistor group (90) to apply it to a pixel group of a liquid crystal display part. Furthermore, the transistor group (90) is preferably provided with a current control circuit part (92) for controlling a current that flows in each transistor.

Description

technical field [0001] The present invention relates to a liquid crystal drive circuit for driving a liquid crystal display portion of a liquid crystal display device, particularly to a grayscale voltage generation circuit thereof, and to a liquid crystal display device including the liquid crystal drive circuit. Background technique [0002] In recent years, liquid crystal display devices capable of color display using TFT liquid crystals have been used in mobile devices that use batteries such as mobile phones as their power sources. [0003] The problems in this kind of equipment are battery life and cost reduction, but in the liquid crystal display part, the gradation voltage generation circuit for displaying gradation is the main factor that hinders the cost reduction due to the large number of components, and there is power consumption Big question. [0004] In addition, in a color liquid crystal display device using a color filter, about 2 / 3 of the backlight is absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20G09G3/34
CPCG09G3/3688G09G3/3696
Inventor 秋山贵
Owner CITIZEN WATCH CO LTD