An image display device incorporates a group of pixels of two or more types, each pixel including a light source whose primary wavelength is specific to the type of pixel; a generating device for generating analog pixel signals to be input to the group of pixels from input digital pixel data, wherein the generating device has a converter to convert input digital pixel data into different output digital pixel data appropriate for each type of pixel where the output digital pixel data contains more bits than the input digital pixel data; and an input device for inputting the analog pixel signals to the group of pixels, each pixel including a light emission driver for driving the light source according to the analog pixel signal. An organic EL display device having individual R, G, and B light emission elements enables displaying in desired colors and controllable tones with reduced packaging area for the components of the organic EL display.