Patent ID: 7045974
Filing Date: 2006-05-16
Classification: H05B

Abstract:
1. An LED optical energy detection and feedback system comprising: an optical energy sensor having a plurality of phototransistors; a current/voltage converter; an analog/digital converter; a CPU containing respective pulse width modulation units; a driver having three driver ICs; and an LED array having a red light LED lamp set, a green light LED lamp set, and a blue light LED lamp set, said LED lamp sets having been screened by test so that all said LED lamp sets meet same standard of characteristics, said red LED lamp set being connected in series to a red LED lamp of same characteristics for detection, said green LED lamp set being connected in series to a green LED lamp of same characteristics for detection; and said blue LED lamp set being connected in series to a blue LED lamp of same characteristics for detection, said red, green, and blue LED lamps for detection being then linked to said optical energy sensor; said phototransistors being matched to one another, each of said phototransistors being capable of receiving light emitted respectively by said red, green and blue LED lamps for detection and relating to an optical semiconductor to output an amperage based on optical energy received from light source; whereby each of said phototransistors matched in said optical energy sensor upon receiving respective optical energy will output different amperages which are then converted into voltages via said current/voltage converter, said analog/digital converter converts analog signals of said voltages into digital signals to provide information for determination by said CPU, said CPU being preset with parameters of optical energy respectively for red light, green light and blue light in optimal balance conditions of white light, and after reading and comparison of and between said voltages in digital form and said parameters, compensation required for any difference found between any outputted optical energy from said red, green and blue lamps for detection and said parameters preset in the CPU is solved and one or two matching pulse width modulation units will vary voltage and frequency for output, said voltage and frequency being then adjusted for amperage by respective units of matching driver ICs in said driver ICs and fed back to said LED array to complete optical energy detection and feedback for said LED array, and upon said LED array is activated, said system will immediately commence thorough detection and feedback to make sure that light source of said LED array meets white balance requirements.