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:
Jan. 30, 2001
Filed:
Jan. 29, 1998
Yoshikazu Yokota, Kodaira, JP;
Kunihiko Tani, Kodaira, JP;
Gorou Sakamaki, Kodaira, JP;
Katsuhiko Yamamoto, Tachikawa, JP;
Takashi Yoneoka, Tachikawa, JP;
Kazuhisa Higuchi, Tachikawa, JP;
Kimihiko Sugiyama, Matsudo, JP;
Other;
Abstract
In conventional liquid crystal display controllers such as for portable telephone sets, the display is reduced in the stand-by state but the liquid crystal display duty is not changed, i.e., even the common electrodes of the rows that are not producing display are scanned, and the consumption of electric power is not decreased to a sufficient degree in the stand-by state. A liquid crystal display controller (,) includes a drive duty selection register (,) capable of being rewritten by a microprocessor (,), and a drive bias selection register (,). When the display is changed from the whole display on a liquid crystal display panel (,) to a partial display on part of the rows only, the preset values of the drive duty selection register and of the drive bias selection register are changed, so that the display is selectively produced on a portion of the liquid crystal display panel at a low voltage with a low-duty drive.