Patent ID: 9430977
Filing Date: 2016-08-30
CPC Classification: G09G

Claim Text:
1. A video signal processing circuit which analyzes video signals inputted from outside, performs conversion processing for image quality adjustment on the video signals based on a result of analysis, transmits the video signals towards a video display unit, and generates and transmits drive control signals regarding a backlight which lights up the video display unit from a back face, the video signal processing circuit comprising: a gradation conversion processing unit which executes conversion processing of gradation of the video signals based on the feature value and a threshold value that is specified by the feature value, wherein the gradation conversion processing unit comprises: a gradation conversion threshold value calculation module which calculates the threshold value based on a threshold value calculation expression that is formed based on the feature value and a conversion coefficient set in advance; and a gradation conversion module which performs gradation conversion based on a linear function that increases linearly by taking a region of the gradation equal to or higher than the threshold value among the video signals as a target, wherein the threshold value calculation expression is expressed as a numerical expression “Xa=α^(1/2.2)×Rank”, where the threshold value is Xa, the feature value is Rank, and the conversion coefficient is α.