Method and apparatus for driving a display device

An apparatus for driving a display device for applying digital values to pixels arranged in matrix on a display panel as corresponding display data, and illuminating the pixels at a brightness corresponding to the magnitude of the digital values to achieve gradation display, comprising:

• picture signal generating means for delivering digital display data as picture display data as picture signal and vertical synchronizing signal for defining one display frame,
• arithmetic means for performing predetermined calculation on the digital display data from the picture signal generating means,
• data selecting means for applying either the display data from the picture signal generating means or the data from the arithmetic means to the display device, depending on a selection signal for specifying the digital data to be delivered in one display frame, and
• selection signal generating means for generating the selection signal on the basis of the vertical synchronizing signal, wherein
• plural display frames are set as one cycle, and display data applied to the display device from the picture signal generating means is given to the display device in several display frames selectively determined in one cycle, and the output from the arithmetic means is given to the display device in other display frames in the same cycle, the selection whether display data or output from the arithmetic means is selected being dependent upon the selection signal from said selection signal generating means that is input into said data selecting means which is determined by multiple bit signals and outputs from a counter applied by the vertical synchronizing signal.