Patent ID: 8390652

Claim:
A drive control circuit for a color display device designed for display of a color image based on a four or greater number of primary colors including three primary colors of red, green and blue, the drive control circuit driving a display section for the display of the color image, the drive control circuit comprising: a conversion circuit for receiving a control signal externally, and based on the control signal converting first primary-color signals which are digital signals representing the color image based on the number of primary colors into second primary-color signals which represent the color image based on the number of primary colors; and a drive circuit for generating a drive signal for driving the display section based on primary-color signals obtained from the conversion circuit, and supplying the drive signal to the display section, wherein the conversion circuit converts the first primary-color signals into the second primary-color signals by adjusting a level of the first primary-color signals-as a function of the control signal and the first primary-color signals such that a relationship between the first primary-color signals and the second primary-color signals in those colors other than the three primary colors is different from a relationship between the first primary-color signals and the second primary-color signals in any of the three primary colors, and the conversion circuit includes: a primary-color conversion circuit for receiving third primary-color signals as externally supplied digital signals representing the color image based on the three primary colors, and converting the third primary-color signals into fourth primary-color signals which are digital signals representing the color image based on the number of primary colors; a selection circuit for receiving primary-color signals as externally supplied digital signals representing the color image based on the number of primary colors, and outputting either the primary-color signals received externally or the fourth primary-color signals obtained from the primary-color conversion circuit, as the first primary-color signals; and a level conversion circuit for converting the first primary-color signals into the second primary-color signals by adjusting a level of the first primary-color as a function of the control signal and the first primary-color signals such that a relationship between the first primary-color signals and the second primary-color signals in those colors other than the three primary colors is different from a relationship between the first primary-color signals and the second primary-color signals in any of the three primary colors, and supplying the second primary-color signal to the drive circuit.