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 three red, green and blue light-emitting tubes that make up the display screen, which ultimately only participates in the imaging use of one pixel. To get enough brightness. Today, I will introduce the difference between static and scanning led display screens.
led display
The difference between static and scanning LED display
1. When the LED display screen displays text, image and video, if the lights on the LED display screen are illuminated at the same time, it means that the display screen is a static screen. If the light on the LED display screen is like a scan, it uses the characteristics of human visual persistence to light up each row of the LED display screen in a short period of time, then it means that the screen is a scanning screen.
2. Since the LED display screen is driven by the duty cycle, the brightness of the LED display screen 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 also 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 very high requirements for the control and drive parts, as well as certain requirements for the drive chip.
1. Static display drive: Static drive is also called DC drive. Static drive means that each segment of each nixie 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.
2. Dynamic display drive: The dynamic display interface of the digital tube 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 for 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.
