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

專利號(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
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 electric field strength e (V/m) is a value obtained by dividing the potential difference Vn between adjacent electrodes configured for ion trapping by the arrangement pitch p (m) of the electrodes configured for ion trapping as represented by equation (2).
That is, e=Vn/p ??(2).

The potential difference Vn between adjacent electrodes configured for ion trapping is equivalent to double the effective voltage VE of the AC signals, and thus the following equation (3) is derived.
That is, e=2VE/p ??(3).
Note that, as in Example 1 illustrated in FIG. 8, the effective voltage VE of the AC signals having rectangular waves is equivalent to the potential with respect to the COM potential having a rectangular wave, and is 5 V.

By inserting equation (3) into equation (1), the moving speed v (m/s) of the ionic impurities is represented by equation (4).
That is, v=VE/p ??(4).

The time td of the ionic impurities moving between adjacent electrodes configured for ion trapping is a value obtained by dividing the arrangement pitch p of adjacent electrodes configured for ion trapping by the moving speed v of the ionic impurities as represented by equation (5).
That is, td=p/v=p2/2μVE ??(5).

Thus, a preferable frequency f (Hz) is obtained by the scrolling of electric field in accordance with the time td of the ionic impurities moving between adjacent electrodes configured for ion trapping. The time of the scrolling of electric field is equivalent to the difference Δt in phase between the AC signals, and when Δt is 1/n period, a preferable frequency f (Hz) is derived from the following equation (6). That is,
f=l/n/td=VE/np2 ??(6)

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