| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 98 === The purpose of this paper is to develop a mixed RGB LEDs driving circuit. First, to measures the electric and optical characteristic of RGB LEDs. And based on additive color mixing of color engineering to calculate mixing ratio, in further, utilize the integrating sphere to verify whether RGB three in one LED is mixed white light. Second, implement RGB LEDs backlight driving circuit for LCD Panel. Because RGB LEDs have different operation voltage, need multi-output flyback converter to supply three voltage for RGB LEDs, collocating constant current circuit to achieve accurate current control among RGB LEDs strings. Finally, LED is a semiconductor device so many factors affect its light-emitting characteristics. Photo sensor can be used for optical compensation and peripheral-interface -controller (PIC) is used as a controller. The feedback controller has to maintain the preset flux form each LED to roughly maintain white point.
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