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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.:

US 10565946 B1

PDFFull Text
Date of Patent:
Feb. 18, 2020

Filed:

Nov. 28, 2017

Liquid crystal display device and electronic device including the liquid crystal display device

Applicant:

Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;

Inventors:

Shunpei Yamazaki, Setagaya, JP;

Ryo Arasawa, Isehara, JP;

Jun Koyama, Sagamihara, JP;

Masashi Tsubuku, Atsugi, JP;

Kosei Noda, Atsugi, JP;

Assignee:

Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken, JP;

Attorneys:

Robinson Intellectual Property Law Office

Eric J. Robinson

Primary Examiner:

Liliana Cerullo

Int. Cl.
CPC ...
H01L 27/12 (2006.01); G09G 3/36 (2006.01); H01L 29/786 (2006.01); H01L 21/02 (2006.01); H01L 21/467 (2006.01); H01L 21/477 (2006.01); H01L 29/24 (2006.01); H01L 29/423 (2006.01); H01L 29/45 (2006.01); H01L 29/66 (2006.01); G02F 1/1335 (2006.01); G02F 1/1343 (2006.01); G02F 1/1368 (2006.01);
U.S. Cl.
CPC ...
G09G 3/3614 (2013.01); G02F 1/1368 (2013.01); G02F 1/13439 (2013.01); G02F 1/133553 (2013.01); G09G 3/3648 (2013.01); G09G 3/3677 (2013.01); H01L 21/02164 (2013.01); H01L 21/02266 (2013.01); H01L 21/02565 (2013.01); H01L 21/02631 (2013.01); H01L 21/467 (2013.01); H01L 21/477 (2013.01); H01L 27/1225 (2013.01); H01L 27/1255 (2013.01); H01L 29/24 (2013.01); H01L 29/42356 (2013.01); H01L 29/45 (2013.01); H01L 29/66969 (2013.01); H01L 29/7869 (2013.01); H01L 29/78648 (2013.01); G02F 2201/123 (2013.01); G02F 2202/10 (2013.01); G09G 2300/08 (2013.01); G09G 2310/0286 (2013.01); G09G 2310/08 (2013.01); G09G 2330/021 (2013.01);
Abstract

In a liquid crystal display device including a plurality of pixels in a display portion and configured to performed display in a plurality of frame periods, each of the frame periods includes a writing period and a holding period, and after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period. The pixel includes a semiconductor layer including an oxide semiconductor layer, and the oxide semiconductor layer has a carrier concentration of less than 1×10/cm.

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