Patent ID: 8937443
Filing Date: 2015-01-20
Classification: G09G,H05B

Abstract:
1. A method for controlling light output of an array comprising a plurality of series-connected of light sources by a controller while maintaining a desired operating emittance of the array, each light of the array having a shunt switch, the method comprising: energizing the array of series-connected plurality of light sources by applying a current necessary to generate for the desired operating emittance; during a first time period, closing the shunt switch of a light source of the plurality of light sources, wherein the light source is extinguished; sampling the remaining light of the array by an optical sensor during the first time period and during a second time period when the shunt switch is de-energized; determining a difference in emittance between the first and second time periods; comparing the difference in emittance to a luminance value stored in a memory associated with the shunted light source; and subsequently controlling the operation of the shunt switch based on the comparison, wherein the subsequent controlling produces the desired operating emittance of the array.