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:
Oct. 31, 2006
Filed:
Nov. 08, 2004
Katsumi Inaba, Tondabayashi, JP;
Tsutomu Satoh, Yamatotakada, JP;
Hirohisa Warita, Nara, JP;
Atsushi Kanamori, Nara, JP;
Katsumi Inaba, Tondabayashi, JP;
Tsutomu Satoh, Yamatotakada, JP;
Hirohisa Warita, Nara, JP;
Atsushi Kanamori, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The voltage booster type switching power supply circuit is provided with a drive circuit for controlling a switching element, a start/stop circuit for turning the drive circuit on and off according to a brightness control signal for adjusting a brightness of a light source of a liquid crystal display device, an output voltage detection circuit for detecting whether the output voltage is greater than a predetermined voltage and feeding out a result as a comparison result signal, and a soft-start circuit that does not operate when the comparison result signal is active on the rising edge of the brightness control signal, and that operates so as to increase the output voltage gradually when the comparison result signal is inactive on the rising edge of the brightness control signal.