Cholesteric liquid crystal display apparatus and method for driving cholesteric liquid crystal display device

Abstract

The present invention provides a driving method having a high speed in rewriting a cholesteric liquid crystal display element and low power consumption. All common electrodes are collectively selected and the overall display area is reset to a homeotropic state. At that time, a common reset signal is collectively applied to all the common electrodes and a data reset signal is collectively applied to all segment electrodes. Continuously, a driving voltage waveform consisting of a common select signal and a common hold signal is applied to each common electrode so that the applied common select signal is shifted by its length. For a while after the common select signal is applied to the last common electrode, the common hold signal is applied. The total waveform outputted to the common electrodes and the total waveform outputted to the segment electrodes are composed of two kinds of voltages of a 0 V and a voltage other than the 0 V, wherein the frequency in which the voltage other than the 0 V is outputted to both the electrodes is at the minimum.

Description

technical field [0001] The present invention relates to a common liquid crystal display device (LCD) and a driving method of a liquid crystal display element. Specifically, the present invention relates to a method for driving a liquid crystal through a plurality of common electrodes and a plurality of segment electrodes arranged in opposite states. A cholesteric liquid crystal display device with layer input voltage waveform and a driving method for a cholesteric liquid crystal display element. Background technique [0002] Cholesteric liquid crystal display devices have the advantages of being able to display clearly by using the reflection of external light, even if the power is cut off, the display content will not disappear (memory), and it can realize large-capacity display through simple matrix driving. , In recent years, the application of electronic newspapers and signs has attracted much attention. Furthermore, since a cholesteric liquid crystal display element ha...

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Problems solved by technology

Moreover, the initial voltages of the ON waveform and the OFF waveform output to the segment electrodes are different from each other, and it is also difficult to obtain a uniform display over the entire surface of the display area of ​​the liquid crystal display element.

[0026] In addition, not only the voltage waveform output to the common side, the voltage waveform output to the segment electrode, but also its composite waveform, that is, the voltage waveform input to the pixel, changes drastically. The higher the frequency, the greater the power consumption due to driving. If dry batteries are used As a power supply, such a driving method is not suitable for

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