The Difference Between Static Scanning Mode And Driving Scanning Mode Of LED Display Screen
Apr 08, 2021
1. The difference between static and scanning of the LED screen
1) When the LED screen displays text, image and video, and if the light on the LED screen lights up at the same time, it means that the display screen is static. If the lights on the LED display screen, like scanning, make use of the characteristics of human visual persistence and light up each line of the LED display screen in a short period of time, it means that the screen is scanning.
2) Because the LED display is driven by the duty cycle, the brightness of the LED display has a great relationship with the lighting time cycle. Therefore, outdoor display screen is generally static screen, indoor display screen is scanning screen. However, many outdoor LED displays now also have scanning screens. This is because after the LED material technology is mature, the brightness of the LED light-emitting tube is bright enough. People use outdoor scanning screens in order to save costs. However, the outdoor scanning screen has high requirements for the control and drive part, and also has certain requirements for the driver chip.
2. The difference between LED display static and scanning drive
1) Static display drive: static drive is also called DC drive. Static driving means that each segment of each nixie tube is driven by the I / O port of a single chip microcomputer. The advantages of static driving are high brightness and simple programming. The disadvantage is that it takes up more I / O ports, so the driver must be added in practical application, which increases the complexity of hardware circuit.
2) Dynamic display driver: the digital tube dynamic display interface is one of the most widely used display modes in single chip microcomputer. Dynamic driving is to connect the same name end of 8 display strokes "a, b, c, d, e, f, g, dp" of all nixie tubes. In addition, a bit gating control circuit is added to the common pole COM of each nixie tube. The bit gating is controlled by its own independent I / O line. When the single chip microcomputer outputs the glyph code, all nixie tubes receive the same glyph code. But which nixie tube will show the font depends on the control of bit gating COM terminal circuit by MCU. So as long as we turn on the gating control of the nixie tube to be displayed, the bit will display the font, and the nixie tube without gating will not be on.
