Patent ID: 8339294
Filing Date: 2012-12-25
Classification: G06F

Abstract:
1. An illuminated keyboard comprising: a first plurality of keys each having at least two symbols, a first symbol adapted to transmit visible light and a second symbol adapted to fluoresce when exposed to ultraviolet light, the first plurality of keys associated with a first set of light sources comprising: a first visible light source adapted to simultaneously illuminate two or more of the first symbols of the first plurality of keys, and a first ultraviolet light source adapted to simultaneously illuminate two or more of the second symbols of the first plurality of keys, wherein the first visible light source and the first ultraviolet light source are activated individually; a second plurality of keys each having at least two symbols, a first symbol adapted to transmit visible light and a second symbol adapted to fluoresce when exposed to ultraviolet light, the second plurality of keys associated with a second set of light sources comprising: a second visible light source adapted to simultaneously illuminate two or more of the first symbols of the second plurality of keys; and a second ultraviolet light source adapted to simultaneously illuminate two or more of the second symbols of the second plurality of keys, wherein the second visible light source and the second ultraviolet light source are activated individually, wherein the second visible light source and the second ultraviolet light source are activated independently of the first visible light source and the first ultraviolet light source, wherein the first set of light sources associated with the first plurality of keys is different from the second set of light sources associated with the second plurality of keys, and wherein the first set of light sources and the second set of light sources illuminate different pluralities of keys.