Abstract: A color display device in which a plurality of units are arranged in a matrix, each unit having collectively disposed three light emission diodes of three colors, for example, red, yellowish green, and blue, and in which emission intensity and a luminous color of each light emission diode can be controlled by supplying each light emission diode with a time series electric pulse while varying its intensity and width. In the device according to the present invention, the electrodes are provided collectively on one side of the flexible insulator substrate and multilayer wiring is formed by evaporation or plating on the substrate so that the device has an advantage which could not obtained in the conventional display devices in that the display portion thereof can be rolled.

Abstract: An illuminated tool or key, in which a light source is detachably secured to a surface of the tool or key. Additionally, the emitted light can be modulated to perform an additional keying function when received by the lock. A three-color light emitter is preferable.

Abstract: An illuminated tool or key, in which a light source is detachably secured to a surface of the tool or key. Additionally, the emitted light can be modulated to perform an additional keying function when received by the lock. A three-color light emitter is preferable.