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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

Additionally, because the common electrode does not oppose the at least three electrodes with the liquid crystal layer interposed between the electrodes, the ionic impurity sweeping effect of the at least three electrodes configured for ion trapping is less likely to be affected by the potential of the common signal supplied to the common electrode. In other words ionic impurities can be smoothly swept from the display region to the outside.

In the above-described liquid crystal device, the switching element is in a coupled state in all or part of a first duration in which the common signal is at the first potential and the AC signals are at a negative-polarity potential, or a second period in which the common signal is at the second potential and the AC signals are at a positive-polarity potential, the switching element being in an uncoupled state in a duration other than the first duration, when the common signal is in the first duration and the switching element is in a coupled state, the driving signal is at the fourth potential, and when the common signal is in the second duration and the switching element is in the coupled state, the driving signal is at the third potential.

According to this configuration, the potential supplied to the electrodes configured for ion trapping can be controlled by the driving signal in units of durations equal to ? the first period. In other words, taking the potential of the common signal as a reference, the duration in which the potential of the AC signal applied to the electrodes has a positive polarity, the duration in which the potential has a negative polarity, and the like can be controlled.

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