Lear Corporation
Method of decreasing visible flickering effects in a light emitting diode array operated by pulse width modulated signals

Abstract:

A method of changing the brightness of light emitted by first and second light emitting diodes (LEDs) operated by respective first and second pulse width modulation (PWM) control signals includes the steps of (a) changing a first PWM control signal that operates a first LED from a first initial PWM value at a first rate of change to achieve a threshold PWM value at a predetermined point in time; (b) changing a second PWM control signal that operates a second LED from a second initial PWM value at a second rate of change to achieve the threshold PWM value at the predetermined point in time; and (c) subsequent to the predetermined time, changing both the first PWM control signal and the second PWM control signal from the threshold PWM value to achieve a final PWM value.