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. 13, 2012
Filed:
Feb. 17, 2009
Jun Koyama, Sagamihara, JP;
Keitaro Imai, Yokohama, JP;
Shinji Maekawa, Atsugi, JP;
Makoto Furuno, Atsugi, JP;
Osamu Nakamura, Atsugi, JP;
Shunpei Yamazaki, Setagaya, JP;
Jun Koyama, Sagamihara, JP;
Keitaro Imai, Yokohama, JP;
Shinji Maekawa, Atsugi, JP;
Makoto Furuno, Atsugi, JP;
Osamu Nakamura, Atsugi, JP;
Shunpei Yamazaki, Setagaya, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
When semi-amorphous TFTs are used for forming a signal line driver circuit and a pixel, a large amplitude is required for driving the pixel, and a large power supply voltage is thus needed. On the other hand, when a shift register is made up of transistors having a single conductivity, a bootstrap circuit is required, and a voltage over a power supply is applied to a specific element. Therefore, not both the driving amplitude and the reliability can be achieved with a single power supply. According to the invention, a level shifter having a single conductivity is provided to solve such a problem.