Patent ID: 8692822

Claim:
A method for controlling a display device having plural pixels, said method comprising the steps of: generating video data to be displayed on a screen; generating a vertical synchronization signal for defining a vertical period of a display on the screen; and supplying the video data and the vertical synchronization signal to the display device so as to control the display device, wherein said method allows a change of a refresh rate indicative of how often a screen display of the display device is updated, in a case where a first refresh rate is changed to a second refresh rate at which the screen display is updated less frequently than the first refresh rate, there occurs a third refresh rate during a period in which the first refresh rate is being changed to the second refresh rate, the third refresh rate being a rate at which the screen display is updated (i) less frequently than the first refresh rate and (ii) more frequently than the second refresh rate, in a case where the first refresh rate is changed to the third refresh rate, an inactive period is increased in the vertical period, the inactive period being a period in which the video data is not supplied to the display device, and in a case where the third refresh rate is changed to the second refresh rate, the inactive period is increased in the vertical period.