Patent ID: 7276863
Filing Date: 2007-10-02
Classification: G09G,H05B,Y10S

Abstract:
1. An apparatus for driving an LED array, which includes a plurality of LED elements connected in a series, comprising: a Pulse Width Modulation (PWM) driver for providing a predetermined frequency of PWM driving power to the LED array, and regulating the magnitude of PWM driving power in order for forward driving current to be consistent in accordance with a feedback signal corresponding to the forward driving current of a specific LED; a current sensor for outputting forward driving current running on the LED array driven by the PWM driver into a predetermined range of voltage signal; a feedback controller for converting forward driving current running on the LED array into a feedback signal and providing the feedback signal to the PWM driver; an analogue dimmer for regulating the level of a feedback signal provided by the feedback controller to the PWM driver in accordance with an analogue dimming signal; and a PWM dimmer for regulating duty ratio of a PWM driving signal provided by the PWM driver in accordance with a PWM dimming signal.