If you want to buy a piece of outdoor LED display, LED display people tell you buy is constant, but you do not know the constant flow refers to what? Then you buy the outdoor LED display is really constant? Following on from the sHot Electronics Co.,Ltd editor to introduce!
We know that the lights of the outdoor LED display can be colorful, and are made up of RGB (red, green, blue) tricolor. The current of the tube is mainly controlled by the driving IC, and the constant current drive IC can realize the constant output of the current and control the brightness of the tube, thus protecting the tube and achieving better display effect.
The tube, red, green and blue tube currents of three colors are controlled by 3 identical driving IC respectively. Unlike the red tube, the driving voltage is smaller than the green tube and the blue core. Due to the large power of the outdoor full-color LED display module, in order to ensure the longer life of the red tube core, it is necessary to increase the output resistance for the drive IC output of the red tube core, so as to achieve the following two points:
1., the red drive chip can reach the constant current of the lamp tube to ensure the life of the lamp tube, and the display effect is more uniform.
2. effectively share the constant current drive IC power, reduce the drive IC temperature, thereby reducing the drive IC bad rate.
However, the current market has many outdoor LED display, and did not drive the red IC output plus exclusion, which is undoubtedly a Jerry built behavior. Because of this without exclusion "constant flow" products will lead to drive the IC tube, shorten the service life and the impact of product display uniformity, and so cannot be called the constant current LED display in the true sense, but the "current" LED display.
Therefore, please open your eyes and choose the outdoor full-color LED display with row and stop.