Dynamic LED display screen with increased frequency of input clock signals

摘要

A PWM circuit is disclosed in the application, which includes: a PWM counter, a reference value setting register, a frequency multiplier and a comparator, where the frequency multiplier is adapted to increase the frequency of a clock signal input and to output the clock signal with the increased frequency to the PWM counter. An LED drive circuit is further disclosed in the application. The frequency of a PWM input clock signal is increased to N times of the original frequency of the PWM input clock signal by the frequency multiplier, so that the counting cycle of the PWM counter is shortened to 1/N of the original counting cycle of the PWM counter. Therefore, in the dynamic LED display screen, the refresh frequency can be increased to N times of the original refresh frequency while the original resolution is maintained.

主权项

1. A dynamic LED display screen, comprising:
a PWM circuit comprising a PWM counter, adapted to count a clock signal; a reference value setting register, adapted to set a comparison reference value which determines the duty cycle of a PWM signal; a frequency multiplier, adapted to increase frequency of an clock signal input and to output clock signal with the increased the frequency to the PWM counter; and a comparator, adapted to generate a PWM signal based on a comparison between the comparison reference value and the count value of the PWM counter; an LED light source; and a drive module connected between the PWM circuit and the LED light source, for supplying stable current to the LED light source, wherein the display screen is a dynamic LED display screen.