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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

It is considered that ionic impurities are contained, for example, in materials such as adhesive or encapsulant used in processes for manufacturing the liquid crystal panel 110, or enter from environments related to the processes. In addition, the liquid crystal device 100 according to the present exemplary embodiment is used as a light modulation unit (light bulb) in a projection-type display device (projector) which will be described later, and hence, the intensity of incident illumination light is strong as compared with a direct-view type liquid crystal device. A terminal group of the liquid crystalline polymers LC that are organic compounds detaches due to high-intensity illumination light incoming into the liquid crystal layer 50, and may become ionic impurities.

In the liquid crystal device 100 according to the present exemplary embodiment, an ion trapping mechanism configured for sweeping ionic impurities from the display region E1 to collect them is provided in the peripheral region E2 surrounding the display region E1, to improve display problems such as stain or unevenness of display or burning phenomenon due to uneven distribution of ionic impurities. Below, the ion trapping mechanism and the driving method for the liquid crystal device 100 according to the present exemplary embodiment will be described.

Electrical Configuration of Liquid Crystal Device

FIG. 5 is a block diagram illustrating the electrical configuration of the liquid crystal device according to the first exemplary embodiment. FIG. 6 is a schematic cross-sectional view schematically illustrating the arrangement of peripheral electrodes of an ion trapping mechanism according to the first exemplary embodiment.

權(quán)利要求

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