Display control apparatus for performing multicolor display by tiling display

Claim 1

A display control apparatus for displaying more than 2 n colors on a screen of a raster scan type color display unit having only n binary color-element signal inputs, where n is an integer larger than 1, comprising: memory means for storing luminance data corresponding to each of n color elements, to specify respective colors for each of a plurality of dots on the screen, each dot including a plurality of pixels; clock signal generating means for generating a clock signal synchronized with a display of the dots on the screen, and within one clock period of which said plurality of pixels in each dot are displayed on the screen; luminance data read out means for supplying address signals to said memory means and for reading out the luminance data of the respective color elements in response to the clock signal; and video signal controlling means for generating at least three states of a binary color-element signal for each of n color elements in one-dot display period in response to the luminance data for the color element for each dot, and for transmitting the binary color-element signals to the corresponding inputs of the display unit, said states for each color element including a first state wherein the color-element signal is absent for all pixels in one dot, a second state wherein the binary color-element signal is generated at intervals of at least one-pixel display in the one dot-display period, and third state wherein the binary color element signal is generated for all pixels in one dot.