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:
Apr. 07, 2015
Filed:
Jun. 27, 2012
Michiaki Takeda, Osaka, JP;
Eishi Oda, Osaka, JP;
Hiroyoshi Kure, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention effectively suppresses not only occurrences of halos but also degradation of the black level. This image display device has a liquid crystal panel () that displays images according to an image signal and a backlight () in which LEDs are used and controls the light emission brightness of the LEDs for each division region, which is obtained by dividing the backlight () into a plurality of regions, on the basis of a prescribed relation between a gradation value for an image region corresponding to each division region and the LED light emission brightness. When the gradation value for an image satisfies prescribed conditions, a first luminance adjusting portion () adjusts the LED light emission brightness such that the range of variation in LED light emission brightness in a first range for the gradation value of the image region, which is determined on the basis of the prescribed conditions above, is smaller than the range of variations for the LED light emission brightness that is determined on the basis of the prescribed relation above, and a second luminance adjusting portion () adjusts the LED light emission brightness in a second range for which the value is smaller than the first range such that the light emission brightness is smaller than a lower limit value for the LED light emission brightness adjusted above.