Frame Changing Frequency and Refresh Rate of LED
LED display is full digital equipment, which is driven by the impulse current. The Gray-scale and Brightness is realized by PWM (pulse-width-modulation). The illumination of LED is pulse-type. When the frequency of pulse repeating is not fast enough, the human sight would feel twinkling. So, how high the frequency can eliminate the twinkling? Ferry-Porter rule points out, when watching a pulse illumination, coming with the improvement of the pulse repeating frequency, there is a critical point for human eyes. People will feel the illumination continuous, when the frequency is higher than the critical point. That’s we call Critical Fusion Frequency.
Refresh Rate defines how many times the content on the display repeats in each second.
According to Ferry-Porter rule, and our experience, to eliminate the image twinkling, the refresh rate of full color LED display should be higher than 240Hz; Full color LED display with the brightness higher than 4000nits, the refresh rate must be higher than 400Hz.
If there’s camera catching the image and video on the LED display, or relay a TV broadcast (When rent the LED display to stages, arenas, etc events), it’s necessary to enhance the refresh rate to 2000Hz+.
To LED display, it enough to ensure the smooth image and video with the 50/60Hz Frame-Changing Frequency. And the meaning is not so big to improve further.
Send Email
maxvhh