there is disclosed a color liquid crystal display device capable of displaying color images in response to direct entry of input data and / or instructions through operation of an associated coordinate pointing tool . typically , this tool is a pen - like input device known as the “ input pen ” for use in determining the individual position for color display on the screen of a built - in lcd panel . a coordinate detector operates to recognize the position as designated by the input pen , generating and issuing an output signal indicative of the corresponding coordinate data . a color designator circuit designates a color as presently selected for color display . a memory device stores therein color data representative of the color designated . a memory controller is responsive to receipt of an address issued from the selected coordinate data for controlling the color data to be written into and read out of the memory . an output controller allows the color data read from the memory to be supplied to the lcd display screen as video data .