Patent ID: 8232492

Claim:
A keypanel assembly, comprising: first and second light-emitting diodes (LEDs) attached to a printed wiring board; first and second switches attached to the printed wiring board; a first control button configured to actuate the first switch, the first control button permitting light from the first LED to pass through the first control button to an outer surface of the first control button to illuminate control symbology disposed thereon; a second control button configured to actuate the second switch, the second control button permitting light from the second LED to pass through the second control button to an outer surface of the second control button to illuminate control symbology disposed thereon; an isolating structure that prevents light emitted by the second LED from illuminating control symbology on the first control button, the isolating structure further preventing light emitted by the first LED from illuminating control symbology on the second control button; and a chassis, wherein the first and second control buttons are supported by the chassis and the printed wiring board, and wherein the isolating structure is a first and second cavity defined by the printed wiring board and the chassis, the first cavity disposed to permit light emitted by the first LED to travel only through the first control button, and wherein the second cavity is disposed to permit light emitted by the second LED to travel only through the second control button, and wherein output luminance of the first LED and the second LED are isolated and independently controllable.