What is "LED screen"?
Author:Song Na Time:2021-06-07 09:03 Browse(512)
The screen made of LED is mainly used in billboards, such as the big screen of the station (the kind that looks like a dot by dot, the text or image composed of these dots, the most common one is red).
The screen made of LED is mainly used in billboards, such as the big screen of the station (the kind that looks like a dot by dot, the text or image composed of these dots, the most common one is red). LED (light emitting diode) is a kind of solid-state semiconductor device, which can directly convert electricity into light. The heart of LED is a semiconductor chip. One end of the chip is attached to a bracket, one end is the negative pole, and the other end is connected to the positive pole of the power supply, so that the whole chip is encapsulated by epoxy resin. Semiconductor chip is composed of two parts, one is p-type semiconductor, in which the hole is dominant, the other is n-type semiconductor, in which the electron is dominant. But when the two semiconductors are connected, a "p-n junction" is formed between them. When the current acts on the chip through the wire, the electrons will be pushed to the p region. In the p region, the electrons will compound with the holes, and then emit energy in the form of photons. This is the principle of LED luminescence. The wavelength of light, that is, the color of light, is determined by the material that forms the p-n junction.. LCD screen..