Patent ID: 8773336
Filing Date: 2014-07-08
Classification: G09G,H04L,H05B

Abstract:
1. A device, comprising: at least a first LED and a second LED, wherein the first and second LEDs are configured to emit different wavelength light from each other; a controller configured to drive the first LED to emit light during a first time period when the second LED does not emit light, and to drive the second LED to emit light during a second time period when the first LED does not emit light; and a light detector configured to detect an intensity of light produced by the first LED during the first time period and to detect an intensity of light produced by the second LED during the second time period; wherein the controller is further configured to use the light detector to measure a temperature of the device by; wherein the controller is further configured to use a ratio of signals induced in the light detector by the first and second LEDs during the first and second time periods and the temperature measured during the third time period to adjust the intensity of light produced by at least one of the LEDs.