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

專(zhuān)利號(hào)
US10867567B2
公開(kāi)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(lèi)
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(shuō)明書(shū)

The movement speed of the ionic impurities moved by an electrical field produced among the at least three electrodes depends on the mobility of the ionic impurities. According to this configuration, the frequency of the common signal is from 60 Hz to 240 Hz and the frequency of the AC signal is from 0.1 mHz to 5 mHz, and thus even ionic impurities having small mobility can be swept outside of the display region. Note that when the frequency of the common signal is 60 Hz, the first period is 16.7 ms (milliseconds), and when the frequency of the common signal is 240 Hz, the first period is 4.2 ms (milliseconds). On the other hand, when the frequency of the AC signal is 0.1 mHz, the second period is 10000 seconds, and when the frequency of the AC signal is 5 mHz, the second period is 200 seconds.

In the above-described liquid crystal device, the at least three electrodes are preferably disposed surrounding the display region in the first substrate.

The movement direction of the ionic impurities in the liquid crystal layer is affected by the alignment direction of the liquid crystal molecules in the liquid crystal layer. According to this configuration, the at least three electrodes configured for ion trapping are provided surrounding the display region, and thus ionic impurities can be swept outside the display region regardless of the alignment direction of the liquid crystal molecules in the liquid crystal layer.

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