LED driving device with pulse width modulation
AssigneeMacroblock, Inc.
InventorsYang-Chi Jeng, Rong-Tsung Lin
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Abstract
The present invention discloses an LED driving device with pulse width modulation (PWM) capable of preventing the LED display from flickering. The LED driving device primarily comprises a PWM unit for modulating the ON/OFF signal with a PWM cycle from one signal of higher resolution to two or more signals of lower resolution. The modulation is executed with the proviso that the duty cycle of the PWM cycle is almost or completely preserved. Accordingly, the LED will be lit more frequently and perform preset brightness with a higher refresh rate.
Claims9
An LED driving device with PWM (pulse width modulation), comprising a PWM unit and an LED driving circuit, the LED driving device receiving a preset value about brightness of the LED and delivering the preset value to the PWM unit, the PWM unit generating an ON/OFF signal with a duty cycle in a PWM cycle corresponding to the preset value and then modulating the ON/OFF signal, the modulated signal being output to the LED through the LED driving circuit to perform desired brightness;
- wherein:
- the PWM unit modulates the ON/OFF signal from one signal of higher gray-scale resolution to two or more signals of relatively lower gray-scale resolution, so that the LED will be lit more frequently with a higher refresh rate and brightness of the LED before and after modulation is exactly the same or similar to a viewer.
Dependencies are inferred from the claim text.