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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

The third potential of the driving signal S1, S2, S3 is, for example, 5 V, and the fourth potential is, for example, 0 V. In the Example 1, the period of the driving signal S1, S2, S3 is six times the first period of the COM signal, and is 50.4 ms. Thus, the frequency of the driving signal S1, S2, S3 is approximately 20 Hz. The phases of the driving signals S1, S2, and S3 are shifted with each other by ? of one period. In FIG. 7, the frequency of the driving signal S1, S2, S3 is set to 20 Hz to recognize the state of change in the potential of the three driving signals S1, S2, S3. However, the frequency is not limited to this.

The control signal C1, C2, C3 input into the gate of the transistor 130 is a signal that make the transistor 130 ON (coupled state) or OFF (uncoupled state) in a unit of a duration equal to ? (one vertical duration) of the first period of the COM signal, and is set in advance by considering the potential of the driving signal S1, S2, S3 and the potential of the COM signal.

Next, with reference to FIGS. 7 and 8, specific description will be made of the relationship between the control signal C1 and the driving signal S1, and a change in potential of the first electrode 121 relative to the potential (COM potential) of the COM signal, the change being made by the driving signal S1 applied through the first transistor 131.

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