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Liquid crystal device, liquid crystal device driving method, and electronic apparatus

專利號
US10867567B2
公開日期
2020-12-15
申請人
SEIKO EPSON CORPORATION(JP Tokyo)
發(fā)明人
Satoshi Yatabe; Naoki Tomikawa
IPC分類
G09G3/36; G02F1/1343
技術(shù)領(lǐng)域
potential,electrode,signal,driving,crystal,com,in,ac,liquid,polarity
地域: Tokyo

摘要

A liquid crystal device includes, peripheral electrodes including three electrodes for ion trapping, and a transistor coupled to each of the three electrodes. A common signal (COM signal) that varies between a first potential and a second potential in a first period is applied to a counter electrode. A driving signal that varies between a third potential and a fourth potential is input to the transistor. The driving signal is coupled to or uncoupled from the peripheral electrodes by the transistor in a unit of a duration equal to or less than ? of the first period. AC signals varying between a positive-polarity potential and a negative-polarity potential, with a potential of the common signal being a reference, in a second period longer than the first period, are applied to the three electrodes of the peripheral electrodes, in a state where phases of the AC signals are shifted mutually.

說明書

The above-described liquid crystal device preferably further includes three electrodes for ion trapping, an average of the second periods of the AC signal is preferably an integral multiple (n times) of 6 of the first period of the common signal, and the AC signals applied to the three electrodes repeat a period of n×(6+1) and a period of n×(6?1).

According to this configuration, in each of the three electrodes, bias in the polarity of the potential can be eliminated by equalizing the durations in which the potential by the AC signal has a positive polarity and the durations in which the potential has a negative polarity. Eliminating bias in the polarity of the potential in each of the three electrodes configured for ion trapping makes it possible to sweep ionic impurities from the display region toward the outside without ionic impurities attracted by the electrodes being left behind.

In the above-described liquid crystal device, a frequency of the common signal is preferably from 60 Hz to 240 Hz, and a frequency of the AC signal is preferably from 0.1 mHz to 5 mHz.

權(quán)利要求

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