The main working principle of the display:
LED display is usually composed of the main controller, scan board, display control unit and LED display body, the main controller from the computer display card to obtain a screen each pixel color brightness data, and then allocated to a number of scanning board, each scanning board is responsible for controlling a number of rows (columns) on the LED display. The LED display signal on each row (column) is cascaded through each display control unit of the row in a serial manner, and each display control unit is directly oriented to the LED display body.
The work of the main controller is to convert the signal of the computer display into the data and control signal format required by the LED display. The function of the display control is similar to that of the image display screen, which is generally controlled by the gray level. The shift register latch is composed of. However, the scale of the video LED display is often larger, so an integrated circuit with a larger integration scale should be used.
The function of the scanning switch is the so-called link, on the one hand, it accepts the video signal of the main controller, on the other hand, the data belonging to this level is transmitted to its own display control unit, and at the same time, the data that does not belong to this level is transmitted to the next cascade of scanning switches. Video signal and LED display data, in space, time, order and other aspects of the difference, need to have a scan board to coordinate.
1, LED luminous working principle: LED light-emitting diode is a solid-state semiconductor device, it can directly convert electrical energy into light energy. Like other semiconductor devices, it is composed of a P-N junction and also has unidirectional conductivity. When a positive voltage is applied to the LED, the electrons in the N region are pushed to the P region, where they are combined with holes, and the holes in the P region are pushed to the N region, where the electrons and holes are combined, and then energy is emitted in the form of photons. P-N junction with reverse voltage, a few carriers are difficult to inject, so no light.
2, LED material and the color of the generated light:
3, LED Chip packaging structure classification: Chip structure: is divided into unipolar chip packaging structure and bipolar chip packaging structure. The single-pole chip package structure is that the negative electrode of the chip is connected to the copper foil of the PCB board through the silver glue, and the positive electrode is connected to the PCB copper foil through the aluminum wire binding. Mainly used for backlighting. Bipolar chip packaging structure The positive and negative poles of the chip are connected to the PCB copper foil through aluminum wire binding.
LED structure and luminous principle:
The heart of the LED is a semiconductor chip, one end of the chip is attached to a bracket, and one end is
LED lamp
The negative electrode is connected to the positive electrode of the power supply at the other end, so that the entire chip is encapsulated by epoxy resin. A semiconductor chip consists of two parts, one is a P-type semiconductor, in which holes dominate, and the other is an N-type semiconductor, on which are mainly electrons. When these two semiconductors are connected, a \"P-N junction\" is formed between them. When the current is applied to the chip through the wire, the electrons are combined with the holes, and then the energy is emitted in the form of photons, which is the principle of LED light. The wavelength of light determines the color of light, which is determined by the material forming the \"P-N junction\".
LED display is composed of multiple light-emitting diodes