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:
Feb. 08, 2011
Filed:
Aug. 02, 2004
Kazuhiko Miyata, Habikino, JP;
Jun Koyama, Sagamihara, JP;
Hiroyuki Miyake, Atsugi, JP;
Kei Takahashi, Atsugi, JP;
Kazuhiko Miyata, Habikino, JP;
Jun Koyama, Sagamihara, JP;
Hiroyuki Miyake, Atsugi, JP;
Kei Takahashi, Atsugi, JP;
Semiconductor Energy Laboratory Co., Ltd, Atsugi-shi, Kanagawa-ken, JP;
Sharp Kabushiki Kaisha, Osaka-shi, JP;
Abstract
A liquid crystal display device provided with an audio signal processing function, which includes an audio signal processing circuit with a large S/N ratio and a small glitch is provided. The display device of the invention includes a resistor string D/A converter circuit whose dynamic range can be increased by using a common power supply for a D/A converter circuit and a signal line driver circuit. Accordingly, a glitch generated in the D/A converter circuit can be reduced relatively to an audio signal and an S/N ratio of the D/A converted signal can thus be increased.