PWM for global brightness

A project log for 384:LED

Mini (1.44'' x 0.94'' or 24mm x 37mm) 8X16 RGB LED Array. 128 RGB LEDs with three LED chip each gives 384.

AlexAlex 05/16/2016 at 18:450 Comments

with 100% brightness this display is very bright. To change that I added a PWM signal to the output enable line of the drivers. This PWM signal must be faster than the line scanning. Therefore I used only a three Bit PWM, which give me eight brightness steps. The main benefit is, that at least on the lowest brightness it is now also easy to take pictures of it. Here a short video of sweeping tough the brightness.