公开(公告)号：US09366891B2

公开(公告)日：2016-06-14

申请号：US14328269

申请日：2014-07-10

Applicant: Japan Display Inc.

Inventor： Yutaka Sano ,  Takashi Kunimori ,  Toshihiko Tanaka ,  Masanori Yasumori

IPC: G02F1/1335 ,  G02F1/133 ,  G09G3/34 ,  G01J1/42 ,  G02F1/1362 ,  G09G3/36

CPC classification number: G02F1/13318 ,  G01J1/4204 ,  G02F1/1336 ,  G02F1/136209 ,  G02F1/13624 ,  G02F2001/133618 ,  G02F2001/136245 ,  G09G3/3406 ,  G09G3/3648 ,  G09G2360/144

Abstract: An LCD includes a liquid crystal panel having a TFT substrate, a CF substrate, and a liquid crystal layer interposed between the two substrates; a TFT ambient light photosensor having a semiconductor layer for detecting external light; a photodetector unit having a capacitor in which a predetermined reference voltage is charged and a voltage charged by leakage current of the TFT ambient light photosensor is lowered; and an ambient light photosensor reader unit for reading a voltage charged in the capacitor for a predetermined read period. The photodetector unit is disposed on a first surface of the TFT substrate that is in contact with the liquid crystal layer, and the surface of the photodetector unit except for the semiconductor layer and its periphery is covered by a light-shielding layer. Malfunction or reduced sensitivity of an ambient light photosensor due to light from backlights is prevented with a simple structure.

Abstract translation: LCD包括具有TFT基板，CF基板和插入在两个基板之间的液晶层的液晶面板; 具有用于检测外部光的半导体层的TFT环境光电传感器; 具有电容器的光检测器单元，其中预定参考电压被充电，并且TFT环境光光电传感器的漏电流充电的电压降低; 以及环境光光传感器读取单元，用于在预定的读取周期内读出在电容器中充电的电压。 光检测器单元设置在与液晶层接触的TFT基板的第一表面上，除了半导体层及其外围的光检测器单元的表面被遮光层覆盖。 通过简单的结构防止由于来自背光的光引起的环境光传感器的故障或降低的灵敏度。