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The difference between static and scanning LED display

The static and dynamic scanning of LED display screens correspond to each other. Generally speaking, real-pixel LED display screens refer to each of the red, green and blue light-emitting tubes that make up the display screen and only participate in the imaging of one pixel. To obtain sufficient brightness. Today, I will introduce the difference between static and scanning led display.





The difference between static and scanning LED display

  1. When the LED display screen displays text, images and videos, if the lights on the LED display screen are lit at the same time, it means that the display screen is a static screen. If the light on the LED display screen is like scanning, it uses the characteristics of human visual persistence to light up each row of the LED display screen in a short period of time, which means that the screen is a scanning screen.


  1. Since the LED display screen is driven by the duty cycle, the brightness of the LED display has a great relationship with the lighting time period. Therefore, outdoor display screens are generally static screens, and indoor display screens are mostly scanning screens. However, many outdoor LED display screens now have scanning screens. This is because after the LED material technology matures, the brightness of the LED light-emitting tube is already bright enough, and people use outdoor scanning screens in order to save costs. However, outdoor scanning screens have high requirements for the control and drive parts, and also have certain requirements for the drive chip.


The difference between static and scanning LED display


The difference between static and scanning LED display

  1. Static display drive: Static drive is also called DC drive. Static drive means that each segment of each digital tube is driven by an I/O port of a single-chip microcomputer. The advantages of static driving are high display brightness and simple programming. The disadvantage is that it occupies more I/O ports. Therefore, *drivers must be added for driving in actual applications, which increases the complexity of the hardware circuit.


  1. Dynamic display drive: The digital tube dynamic display interface is one of the most widely used display methods in the single-chip microcomputer. The dynamic drive is to combine all the 8 display strokes of the digital tube "a, b, c, d, e, f, The ends of the same name of "g, dp" are connected together, and a bit gating control circuit is added to the common pole COM of each nixie tube. The bit gating is controlled by each independent I/O line. When the single-chip microcomputer outputs the font code, All the nixie tubes receive the same font code, but which nixie tube will display the font depends on the microcontroller's control of the bit gate COM terminal circuit, so we only need to turn on the gate control of the nixie tube that needs to be displayed , The bit will display the font, and the digital tube without strobe will not light up.


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