Memory-type liquid crystal driving circuit

A drive circuit, memory technology, applied in instruments, static indicators, etc., can solve problems such as difficulty in fully recycling electricity

Inactive Publication Date: 2012-10-31
FUJITSU FRONTECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that it is difficult to sufficiently recover the electric power accumulated between the liquid crystal display elements.

Method used

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  • Memory-type liquid crystal driving circuit
  • Memory-type liquid crystal driving circuit
  • Memory-type liquid crystal driving circuit

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Experimental program
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Embodiment Construction

[0026] Hereinafter, preferred modes for carrying out the present invention will be described in detail with reference to the drawings.

[0027] figure 1 is a block diagram of the first embodiment, in figure 1 The structure of the basic embodiment of the drive circuit of the memory liquid crystal display element used, for example for electronic paper is shown in . This structure includes: charging control circuit 101; first battery 102; booster circuit 103; power supply smoothing capacitor 104; switch 105; voltage dividing / voltage setting circuit 106; common driver integrated circuit (COM-DV) 107; segment driver An integrated circuit (SEG-DV) 108 ; an electronic paper panel (EP panel) 109 ; a switch 110 ; a charging and discharging control circuit 111 ;

[0028] The charging control circuit 101 takes in the AC adapter power supply 113 and the like, and performs charging to the first battery 102 serving as a main battery and supply of driving power to the booster circuit 103 a...

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PUM

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Abstract

A memory-type liquid crystal driving circuit wherein the charge stored in a power supply smoothing capacitor provided in a stage following a booster circuit can effectively be recovered after a termination of power supply to a liquid crystal display device. In the memory-type liquid crystal driving circuit: at a time of resetting or rendering of the liquid crystal display device (109), a first switch circuit (105) is turned on, thereby supplying a boosted voltage (VDDH) to driver circuits (107, 108); and when the charge stored in the power supply smoothing capacitor (104) is to be discharged, a second switch circuit (110) is turned on, thereby causing the charge stored in the power supply smoothing capacitor (104) to be discharged and thereby recovered into the second battery (112).

Description

technical field [0001] The invention relates to the driving technology of a liquid crystal display element with memory. Background technique [0002] A liquid crystal display element called a so-called memory liquid crystal display does not require power except for the moment when an image is written on the display, and the liquid crystal display element can continue to maintain the content displayed on the screen even if the power is cut off. Therefore, it has a characteristic that the required power is extremely small compared with general liquid crystal displays that always require power for display. [0003] Utilizing this feature, memory liquid crystal displays are expected to be applied to electronic paper, electronic books, and mobile phones or mobile devices requiring power saving. [0004] Liquid crystal display elements such as cholesteric liquid crystal (Cholesteric Liquid Crystal) and chiral nematic liquid crystal (Chiral Nematic Liquid Crystal) are known as mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/36
CPCG09G3/3629G09G2330/023
Inventor 松尾博之
Owner FUJITSU FRONTECH LTD
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