How to correctly understand the LED display? _Full color led display|LED display manufacturer|Huaze Optoelectronics

What is an LED display? The LED (Light Emitting Diode) of the LED display is a solid-state semiconductor device that can directly convert electricity into light. The heart of the LED is a semiconductor chip, one end of the chip is attached to a support, one end is the negative pole, and the other end is connected to the positive pole of the power supply, so that the entire chip is encapsulated by epoxy resin. The semiconductor wafer consists of three parts, one part is a P-type semiconductor, in which holes dominate, the other end is an N-type semiconductor, here are mainly electrons, and the middle is usually a quantum well with 1 to 5 cycles. When the current acts on the chip through the wire, the electrons and holes will be pushed into the quantum well. In the quantum well, the electrons and holes recombine and then emit energy in the form of photons. This is the principle of LED light emission. The wavelength of light is also the color of light, which is determined by the material forming the P-N junction. The LED display screen can realize the change of hundreds or even thousands of colors. Comparison of LED display and LCD display The power consumption ratio of LED display and LCD display is about 1:10, led display is more energy-efficient; it has a higher refresh rate and has better performance in video; led The display screen provides a wide viewing angle of 160°, can display various text, numbers, color images and animation information, and can play color video signals such as TV, video, VCD, DVD, etc. The reaction speed of a single element of the LED display is 1000 times that of the LCD liquid crystal screen. It can be illuminated under strong light without fail, and it can adapt to the low temperature of minus 40 degrees. LED display repair first: determine the type of HUB board used by the LED display module or the LED display unit board, so that the interface definition of the cable can be the same. Second: According to different types of LED display modules or LED display unit boards, send the corresponding program to the receiving card to ensure that the LED display modules and LED display unit boards are displayed under the correct program. This is to find out the fault The premise of the cause. Generally, the model of the module or unit board is printed on the PCB board. Finally: observe the phenomenon of the LED display module or the LED display unit board to determine the preliminary failure. For example, common blind lights, string points, small squares, etc. Use a multimeter to find out the fault, mainly using the above short-circuit detection method to detect between the chip and the lamp pin. Attention must be paid to the use of outdoor LED display. The LED display is installed outdoors, often exposed to the sun, rain, wind and dust, and the working environment is harsh. If electronic equipment gets wet or severely damp, it can cause short circuit or even fire, cause malfunction or even fire, and cause loss. The display screen may be attacked by strong electricity and magnetism caused by lightning. Outdoor LED displays vary greatly with the ambient temperature. When the outdoor LED display is working, it will generate a certain amount of heat. If the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may not work properly, or even be burned, so that the outdoor LED display system cannot work normally. The audience is wide, the viewing distance is long, and the field of view is wide; the ambient light changes greatly, especially if it may be exposed to direct sunlight.