Method for driving cholesterol liquid crystal display device

Abstract

The invention relates to a method for driving a cholesterol liquid crystal display device. The cholesterol liquid crystal display device comprises a plurality of pixels. The method comprises the following steps: in the first stage, providing a first square wave to the pixels, wherein the amplitude of the first square wave is a first value; and in the second stage, respectively providing a second square wave to the pixels according to the gray scales required by the pixels, wherein the amplitude of the second square wave is a second value which is different from the first value, and the first square wave and the second square wave are continuously provided. The method can be used for displaying dynamic pictures and lowering driving voltages for the pixels.

Description

technical field [0001] The present invention relates to a driving method, in particular to a driving method of a cholesteric liquid crystal display device. Background technique [0002] Cholesteric liquid crystal (cholesteric liquid crystal) has two stable states: reflective state (planar state or planar texture) and scattering state (focal conic state or focal conic texture) when no voltage is applied to drive it. , so it is called a bistable material. In a cholesteric liquid crystal display device, cholesteric liquid crystals reflect light of a specific wavelength in a reflective state, so that the corresponding pixels appear in a bright state. When the cholesteric liquid crystal is in the scattering state, the light will be scattered and absorbed by the black back plate disposed behind it, so the corresponding pixels will appear in a dark state. Since the cholesteric liquid crystal can exhibit the above two stable states without being driven by voltage, it is suitable f...

AI Technical Summary

Problems solved by technology

Although the three-phase drive can greatly reduce the time for updating the screen, the time for selecting the phase is too short, so that the cholesteric liquid crystal cannot achieve the best gray scale state, that is, the bright state is not bright enough and the dark state is not dark enough, which will cause part of the screen display poor quality

In addition, when the driving time is too long, the cholesteric liquid crystal is not fast enough to switch states, which will cause the problem of black lines on the displayed picture. The two-phase driving can make the human eye not respond to black when the picture is updated quickly. However, the time for updating a single screen cannot be shortened, so it can only be used for static screen playback, and cannot be used for dynamic screen playback.

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