System and method for driving keypad backlight with balance-dimming capability

摘要

The present invention is an apparatus with balance-dimming capability for controlling the brightness of keypad backlight. The keypad backlight includes a plurality of light emitting diodes (LEDs). The apparatus includes a switch and a pulse-width modulation (PWM) generator. The switch is coupled between a power supply and the plurality of LEDs. The PWM generator is coupled to the power supply and the switch, and is capable of generating a PWM signal and controlling the brightness of the plurality of LEDs.