PWM output method, system, device and storage medium applied to LED matrix

Abstract

The present application discloses a PWM output method, system, device and readable storage medium applied to an LED matrix, including: setting the waveform of the PWM pulse as a voltage waveform that rises with multiple consecutive segments of different slopes and falls with multiple consecutive segments of different slopes within one cycle ; The overall rising slope of the voltage waveform is smaller than a first preset value, and the absolute value of the overall falling slope of the voltage waveform is smaller than a second preset value; outputting the PWM pulse to the LED matrix. Compared with the voltage waveform in the prior art where the first preset value and the second preset value are used as the overall rising slope and the overall falling slope, since the overall rising slope in the present invention is smaller than the first preset value, the absolute value of the overall falling slope Less than the second preset value, the variation of the capacitor voltage in one cycle is smaller than that of the prior art, so the coupling phenomenon in the prior art will not occur, avoiding problems such as ghosting at low gray levels, and making the picture of the LED matrix The display is clearer.

Description

technical field [0001] The invention relates to the field of electronic design, in particular to a PWM output method, system, device and storage medium applied to an LED matrix. Background technique [0002] In the prior art, the dynamic display screen is usually composed of LED matrix and controlled by PWM method. see figure 1 and figure 2 ,in figure 2 The capacitance in the figure 1 The positions of the LEDs are the same, corresponding to the capacitance of the LED itself. [0003] refer to image 3 The ideal PWM control signal output and the actual pulse voltage for the PWM control signal, the actual pulse voltage is not a standard square wave, the interval between the pulse rising start point A and the pulse rising end point B is tr, the pulse rising point A and the pulse rising end point B The slope of the connecting line is the overall rising slope; similarly, the interval between the pulse falling starting point C and the pulse falling end point D is tf, and t...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a PWM output method, system, device and readable storage medium applied to the LED matrix, so as to solve the problem of unclear picture and double image of the LED matrix when the PWM frequency increases

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