Cyclic alternating unipolar pulse LCD image erasing circuit and method

Abstract

The invention discloses a cyclic alternating unipolar pulse LCD image erasing circuit and a method thereof, and solves the contradictory problem of image erasing failure and erasing splash screen through an automatic cyclic positive and negative pulse erasing method. The pulse of each image erased by the automatic cycle positive and negative pulse erasure method is unipolar (positive pulse or negative pulse), and the pulse polarities of the images erased for the first time and the second time are opposite, namely the pulse polarity of the image erased for the Nth time (any one time) is opposite to the pulse polarity of the image erased for the (N + 1) th time; therefore, since the positive and negative polarity pulses are symmetrical, after the erasing being accumulated for several times,the positive unipolar pulse and the negative unipolar pulse almost counteract each other on the surface of the liquid crystal panel, so that the problem of erasure final failure of the LCD due to long-time unipolar action of the homopolar pulse on the screen is effectively avoided, and the problem of erasure splash screen caused by positive and negative switching of polarity in a positive and negative pulse erasure process in single erasure is also solved.

Description

technical field [0001] The invention belongs to the technical field of electronic design, and in particular relates to an LCD liquid crystal screen image erasing technology. Background technique [0002] The LCD liquid crystal screen technology is becoming more and more mature, and its LCD liquid crystal screen is more and more widely used, such as various LCD liquid crystal children's handwriting boards, notepads, electronic blackboards, etc. The LCD liquid crystal panel is dust-free, blue light-free, ultra-low power consumption, and can be erased and reused with one key, so it has wide application prospects. [0003] The LCD liquid crystal image erasing technology is to instantly discharge the liquid crystal by applying a voltage inside the liquid crystal, so as to achieve the purpose of dilution, thereby instantly separating the adhered liquid crystal parts and achieving the purpose of removal. At present, the LCD liquid crystal image erasing methods on the market mainly...

AI Technical Summary

Problems solved by technology

Currently on the market, LCD liquid crystal image erasing methods mainly include: 1. single pulse method (unipolar pulse voltage); 2. multi-pulse method (including bipolar pulse voltage); The combination of pulse method); the above traditional pulse erasing methods are likely to lead to the following problems: 1. After a long time, the single pulse method and the ending method will polarize the LCD liquid crystal screen, resulting in the failure of subsequent image erasing; 2. Multi-pulse Due to the positive and negative polarity changes of the voltage during the method erasing process, it is easy to cause the flicker screen during the erasing process

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