| 摘要 |
Systems and methods are described that provide an efficient and cost-effective LED driver for controlling strings of LEDs (64, 65, 66), Embodiments described include an LED driver that comprises an adaptive boost converter (82) and current source (644, 653, 662) that cooperate to provide a desired light output from energized LEDs (64, 65, 66). Systems and methods are also described that modulate th excitation of the LEDs (64, 65, 66) using a pulsed signal to obtain brightness control. Techniques are described for controlling the operation of individual LEDs in a string of LEDs such that a desired level of light output can be achieved. Embodiments are described in which multicolored LEDs can be included in slrings of LEDs (64, 65, 66) and excitation of the individual LEDs can be controlled to obtained a desired color of output. |
