LED display grayscale and brightness
The gray level of the LED display can also be called the brightness of the LED display. Gray scale is also called midtone, which is mainly used to transfer pictures. There are 16 levels, 32 levels and 64 levels respectively. It adopts the matrix processing method to process the pixels of files into the levels of 16, 32, and 64 levels. The picture is clearer. Whether it is a single-color, two-color, full-color LED display, to display an image or an animation, it is necessary to adjust the gray level of each LED constituting the pixel. The degree of fineness of the adjustment is what we commonly call gray scale.
There are two ways to control the gray level of the LED display: one is to change the current flowing, and the other is pulse width modulation. 1. Change the current flowing through the LED. The general LED tube allows a continuous working current of about 20 mA. In addition to the saturation of the red LED, the gray levels of other LEDs are basically proportional to the current flowing through; the other method is to use the visual inertia of the human eye, with a pulse width The modulation method to achieve gray control, that is, periodically change the width of the light pulse, as long as the period of this repeated lighting is short enough, the human eye can not feel the jitter of the light-emitting pixel.
Since pulse width modulation is more suitable for digital control, today, microcomputers are generally used to provide LED display content. Almost all LED displays use pulse width modulation to control gray levels.
