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

專利號(hào)
US10867567B2
公開日期
2020-12-15
申請(qǐng)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

According to the driving method for a liquid crystal device according to Example 3 as described above, the AC signal is applied to the peripheral electrode 120 such that the duration with positive polarity potential and the duration with negative polarity potential are equal to each other in the unit of a duration of double of one period of the AC signal, and hence, it is possible to eliminate unevenness of polarity of potential in the peripheral electrode 120. The cation (+)-based or anion (?)-based ionic impurities attracted by the peripheral electrode 120 are prevented from stagnating due to uneven polarity of potential in the peripheral electrode 120, and the ionic impurities are smoothly swept from the display region E1 to the sealant 40 side with the scrolling of electric field from the first electrode 121 to the third electrode 123.

Note that, as with the driving method for a liquid crystal device according to Example 1, even if the duration in which the potential of the peripheral electrode 120 has positive polarity and the duration in which the potential has negative polarity differ in the period of the alternative signal, it is possible to sweep the cation (+)-based or anion (?)-based ionic impurities outward from the display region E1, by setting the driving signal such that both of the durations are sufficiently long.

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