Patent ID: 7952556

Claim:
A liquid crystal display device comprising: a liquid crystal display panel; a backlight; and a driving control unit; wherein said liquid crystal display panel displays images corresponding to an input video signal by a driving operation of each of scanning electrodes and each of data electrodes by which a specified gray level voltage is applied to a corresponding pixel region and a response of a liquid crystal is controlled in the pixel region according to the applied gray level voltage; wherein said backlight illuminates the liquid crystal display panel from its rear side; and wherein said driving control unit turns off said backlight during a frame period of said input video signal in which an upper limit gray level for each of red (R), green (G), and blue (B) is set until the liquid crystal shows a response to the application of said specified gray level voltage in said pixel region and turns on said backlight at a point of time when the liquid crystal has shown a response and detects a brightest gray level for each of the R, G, and B of said input video signal in every frame period and converts a gray level for each of the R, G, and B of said input video signal into a value which is given by a following equation, whereby the detected brightest gray level and the corresponding upper limit gray level become at a same level, and the gray level voltage corresponding to the converted value is applied to the corresponding pixel region and, during a lighting period of said backlight, makes said backlight flash at a duty corresponding to a rate of said brightest gray level to the corresponding upper limit gray level: a value =[the gray level for each of R, G, and B of the input video signal]×[the corresponding upper limit gray level]÷[the detected brightest gray level] (equation).