Patent ID: 9697758
Date: 2017-07-04
CPC Classifications: G09G

Claim:
1. A control device for a display device, said control device comprising: an image determining section for determining whether or not grayscale levels of a plurality of pixels in an image fall within a first range which consists of intermediate grayscale levels; a driving changing section for changing, according to a result of the determining carried out by the image determining section, a refresh rate of the display device; and a rewriting detection section for evaluating an interval between points in time where content of the image is changed, wherein the image determining section determines whether or not a percentage of pixels, of all pixels in a predetermined region of the image, which have grayscale levels falling within the first range is equal to or higher than a first threshold value, in a case where the percentage is lower than the first threshold value, the driving changing section determines that the image is to be displayed at a first refresh rate, in a case where the percentage is equal to or higher than the first threshold value, the driving changing section determines that the image is to be displayed at a second refresh rate which is higher than the first refresh rate, in a case where the interval is equal to or shorter than a predetermined interval threshold value, the driving changing section determining that the image is to be displayed at a third refresh rate which is higher than the first refresh rate and which is lower than the second refresh rate, in a case where (i) the interval is longer than the interval threshold value and (ii) the percentage is lower than the first threshold value, the driving changing section determining that the image is to be displayed at the first refresh rate, and in a case where (i) the interval is longer than the interval threshold value and (ii) the percentage is equal to or higher than the first threshold value, the driving changing section determining that the image is to be displayed at the second refresh rate.