The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2015
Filed:
Apr. 10, 2012
Hajime Kimura, Atsugi, JP;
Yasunori Yoshida, Atsugi, JP;
Hideaki Shishido, Atsugi, JP;
Atsushi Umezaki, Atsugi, JP;
Makoto Yanagisawa, Ebina, JP;
Shunpei Yamazaki, Setagaya, JP;
Hajime Kimura, Atsugi, JP;
Yasunori Yoshida, Atsugi, JP;
Hideaki Shishido, Atsugi, JP;
Atsushi Umezaki, Atsugi, JP;
Makoto Yanagisawa, Ebina, JP;
Shunpei Yamazaki, Setagaya, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
It is an object to provide a display device in which a problem of light leakage from a liquid crystal element in black display is reduced or overcome and the contrast is improved. It is another object to provide a pixel circuit having a function to control a lighting state of a backlight based on each pixel. These objects are achieved by turning off a light-emitting element in display of a black gray scale, and by providing a light-emitting element in each pixel and providing, in a pixel circuit, a function to individually control lighting and non-lighting of the light-emitting element depending on a gray scale to perform display. When a backlight is provided in each pixel, a light-emitting element that is a backlight is turned off when a black gray scale is displayed, whereby reduction in contrast due to light leakage from a liquid crystal element can be prevented.