Method and system for controlling partial erasing voltage of liquid crystal writing device

Abstract

The invention discloses a method and system for controlling local erasing voltage of a liquid crystal writing device. The control method includes: defining the process of the erasing device from entering the writing area to leaving the writing area as an erasing period; defining an erasing preparation state The voltage value loaded on each conductive region on the next two conductive layers; the voltage value can make the electric field formed between the two conductive layers smaller than the erasing electric field; during an erasing period, each time an erasing action is performed, Controlling the voltage values ​​applied on the two conductive layers to return to the erasing preparation state; when performing the next erasing action, controlling the voltage value to change from the erasing preparation state to the set voltage value required for partial erasing. Compared with the prior art, the voltage applied by the two conductive layers must be reduced to zero every time an erasing action is performed. The solution of the present invention greatly shortens the time required for each erasing action and improves erasing efficiency.

Description

technical field [0001] The invention relates to the technical field of partial erasing of a liquid crystal writing device, in particular to a method and system for controlling a partial erasing voltage of a liquid crystal writing device. Background technique [0002] The working principle of the liquid crystal writing film currently on the market is to use the bistable characteristics of liquid crystals to display and / or erase the written content on the liquid crystal writing board. For example, using cholesteric liquid crystal as a writing film, the trajectory of the writing pen is displayed by changing the state of the liquid crystal through the pressure acting on the liquid crystal writing board, and then the corresponding writing content is displayed; the structure of the cholesteric liquid crystal is changed by applying an electric field, so that The writing pressure track on the LCD tablet disappears to enable erasing. [0003] In the prior art, when partial erasing i...

AI Technical Summary

Problems solved by technology

However, due to the influence of the capacitive effect of the liquid crystal writing film, it is difficult for the voltage loaded by the booster circuit to reach the set target voltage value in a short period of time, resulting in the possibility of a band covering the entire area to be erased during the erasing process. The problem that the conductive area becomes shallow or disappears as a whole

[0004] In order to solve the above problems, the prior art discloses a partial erasing voltage control method of step-up and step-down, so that the voltage can be steadily increased to the target voltage value, which can reduce the influence of the capacitive effect of the liquid crystal writing film, thereby reducing the impact on the The quality of the liquid crystal writing film and the requirements of the processing technology improve the yield of the liquid crystal writing film; however, each time the method performs an erasing action, it must go through a complete boosting process and a depressing process, and finally the two conductive layers The applied voltage is reduced to zero; this makes the execution time of an erasing action very long, which affects the erasing efficiency and is not conducive to improving the user experience

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