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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

In each of the above-described exemplary embodiments, to achieve low power consumption by combining the above-described Ion-Surf driving and common inversion driving, and to effectively sweep ionic impurities from the display region E1 to the outside, when the common signal (COM signal) has a frequency of 60 Hz to 240 Hz, the AC signals preferably have a frequency of 0.1 mHz to 5 mHz that is smaller than 12 mHz obtained in consideration of the above-described value of the mobility μ of the ionic impurities. Note that, when the common signal (COM signal) has a frequency of 60 Hz, the first period is 16.7 milliseconds (ms), and when the common signal has a frequency of 240 Hz, the first period is 4.2 milliseconds (ms). On the other hand, when the AC signal has a frequency of 0.1 mHz, the second period is 10000 seconds, and when AC signal has a frequency of 5 mHz, the second period is 200 seconds.

In each of the above-described exemplary embodiments, the three electrodes 121, 122, and 123 (peripheral electrode 120) configured for ion trapping are preferably disposed to have frame shapes (ring shapes) surrounding the display region E1. With this configuration, regardless of alignment control of the liquid crystal molecules LC, ionic impurities, which enter the liquid crystal layer 50 from different directions and diffuse, can be swept to the outside of the display region E1.

Third Exemplary Embodiment

Electronic Apparatus

權(quán)利要求

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