Patent ID: 9144132
Filing Date: 2015-09-22
Classification: H05B

Abstract:
1. A luminance control circuit comprising: a switch in communication with a light, the light having a minimum luminance level and a maximum luminance level; a pulse-width modulator (PWM) generator configured to generate a PWM signal to control the operation of the switch; and a control register in communication with the PWM generator and configured to determine a duty cycle of the PWM signal by providing to the PWM generator one of a maximum allowed change for the PWM signal or a determined target change for the PWM signal; wherein the luminance control circuit is configured to compare the maximum allowed change for the PWM signal to the determined target change for the PWM signal, determine if the determined target change for the PWM signal is less than the maximum allowed change for the PWM signal and if so, providing the determined target change to the PWM generator, and if not providing the maximum allowed change to the PWM generator.