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. 07, 2012
Filed:
Mar. 17, 2009
Katsunobu Kimura, Yokohama, JP;
Takaaki Matono, Yokohama, JP;
Haruki Takata, Yokohama, JP;
Takeshi Sakai, Yokohama, JP;
Wataru Kato, Chigasaki, JP;
Katsunobu Kimura, Yokohama, JP;
Takaaki Matono, Yokohama, JP;
Haruki Takata, Yokohama, JP;
Takeshi Sakai, Yokohama, JP;
Wataru Kato, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A video display device that allows the color temperature of the signals in white color attributes having high luminance and low chroma saturation to be corrected with high precision is provided with a color temperature correction method so as to visually obtain a desirable white color on display. In some embodiments, the signal processing circuit can include an A/D converter to convert video signals into digitalized signals, a matrix circuit to convert the digitalized signals into luminance signals and at least two color difference signals, a hue conversion circuit to obtain hue signals from the color difference signals, a hue correction circuit to correct hue signals, a chroma saturation conversion circuit to obtain chroma saturation signals from color difference signals, a chroma saturation correction circuit to correct chroma saturation signals and a color temperature correction circuit to perform the color temperature correction on the respective hue and chroma saturation signals.