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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

Accordingly, to apply the three electrodes 121, 122, and 123 with the AC signals having the same frequency, shifted in phase from each other, and that varies their potential between a positive potential and a negative potential, taking the COM potential as a reference, in the second period longer than the first period, it is only required to have the predetermined potential being maintained by supplying the driving signal to each of the three electrodes 121, 122, and 123 when the control signal is in an ON state. In other words, the potential of the driving signal in the duration in which the control signal is in an OFF state is not limited to being maintained at certain potential (the third potential or the fourth potential) as indicated in Example 4. The driving method for the liquid crystal device according to Example 5 indicates another example of the driving signal when the control signal is in an OFF state.

As illustrated in FIG. 15, similar to Example 1 described above, the common signal (COM signal), in the driving method for the liquid crystal device according to Example 5, is a signal that varies between the first potential (5 V) and the second potential (0 V) that is smaller than the first potential in the first period. The first period is 8.4 milliseconds (ms) as with the COM signal according to Example 1. In other words, the frequency of the COM signal is 120 Hz.

權(quán)利要求

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