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. 25, 2014
Filed:
Apr. 15, 2011
Hiroyuki Kurabayashi, Yokohama, JP;
Yasutaka Tsuru, Yokohama, JP;
Yuya Ogi, Yokohama, JP;
Kazuhiko Tanaka, Fujisawa, JP;
Akihiro Shiraishi, Yokohama, JP;
Hiroyuki Kurabayashi, Yokohama, JP;
Yasutaka Tsuru, Yokohama, JP;
Yuya Ogi, Yokohama, JP;
Kazuhiko Tanaka, Fujisawa, JP;
Akihiro Shiraishi, Yokohama, JP;
Hitachi Maxell, Ltd., Ibaraki-shi, Osaka, JP;
Abstract
An initial light control value calculation section calculates the backlight's initial light control value K0 according to brightness of an inputted image signal for each area. A black area measurement section measures a black area S by obtaining ratio of the number of pixels satisfying Y≦Y0 (Y: brightness signal level, Y0: black level threshold) in the screen. A minimum light control value output section determines a minimum light control value Kmin based on comparison between the measured black area S and a black area threshold S0 and outputs a maximum value permissible for the light control value as the value Kmin when the black area S is the threshold value S0 or less. An LED control signal calculation section outputs a control signal to LED light sources based on a light control value K1 as the higher one of K0 and Kmin.