Display device for e.g. fabrication of keyboard, has filters with zones corresponding to predefined light signals, which pass through respective red and green color rays to permit display of light signals of red and green colors on same key

摘要

The device has light filters (20-22) for intercepting light rays of blue, red and green colors generated by light sources (30-32). Each filter has zones (50, 51) corresponding to predefined light signals. The light signals pass through respective red and green color rays intercepted by the filters to permit the display of light signals of red and green colors on a same key of a computer keyboard.