Basic Knowledge about Rental LED Display Screens Gray Scale Pub Time : 2017-09-29 15:20:00
LED display screen’s gray scale, also known as the middle tone, is mainly used for transmitting pictures, there are 16, 32, 64 three ways of gray scale. It uses the matrix approach to process the file’s pixel as 16, 32 or 64 level, so that the picture on rental LED display screens can be clearer. Whether it is single color, double color or full color LED display screens, to display the image or animation, we will need to adjust the gray scale of each LED light which constitute the pixels, the adjustment fine degree is what we usually call the gray level.
There are two ways to control the gray scale of rental LED display screens
: one is to change the current flowing, one is modulate the pulse width. Normally, the continuous operating current of rental LED display screens is about 20mA, except red LED may has saturation phenomenon, the gray scale of other LED is basically proportional to the current flowing; another method is to use human eyes’ visual inertia, with pulse width modulation method to achieve gray-scale control, that is, periodically change the width of the optical pulse, as long as the light repetition cycle is short enough, the human eye will not feel the luminous pixels of rental LED display screens is shaking.
As the pulse width modulation is more suitable for digital control, so in the general use of microcomputer to provide LED display content today, almost all of the rental LED display screens
are using pulse width modulation way to control the gray level of LED screens.