Basic knowledge of LED

What is the LED?

LED (Light Emitting Diode), light-emitting Diode, is a solid-state semiconductor devices, it can be directly put DianZhuan into Light. The heart of the LED is a semiconductor chip, chip attached on a bracket, at the end of the end is negative, the other end connected to the power of the anode, the whole chip is encapsulated by epoxy resin. Semiconductor chip consists of three parts, one part is a p-type semiconductor, dominated by holes in it, the other end is n-type semiconductor, mainly electronics, here in the middle is usually one to five cycles of quantum well. When a current flows through a wire to the chip, electrons and holes will be into the quantum well, quantum well in electron and hole recombination, then will be issued in the form of photon energy, this is the principle of LED. And the wavelength of light was the color of the light, is determined by the formation of p-n junction material. Leds can achieve hundreds even thousands of color change.

LED and LCD display contrast

LED and LCD power consumption ratio is about 1:10, LED and energy saving; Leds have higher refresh rate, has better performance in video; Leds provide wide reaches 160 ° Angle of view, can display all kinds of words, Numbers, color images and animation information, can broadcast television, video, VCD, DVD and other color video signal. LED display individual elements of the reaction speed is 1000 times that of the LCD screen, under the strong light also can look after not false, and to adapt to the low temperature of 40 degrees below zero.

LED display maintenance

First: to determine the module or unit board using the HUB board type, in this way can row line interface definitions.

Second: according to different types of module or unit board, to the receiving card sends the appropriate procedures, to ensure that the module and unit plate under the correct procedures, according to the premise of this is to find the cause of the problem. Generally with the module or unit on the PCB board.

Finally: observation module or unit board, determine the initial failure. Small cross points, such as common blind lamp, square, etc. Using a multimeter to find fault, mainly is to use the short circuit test, to test the chip and lamp feet between.

Outdoor LED display using the necessary attention to problems

Screens installed outdoors, and often, the wind dust cover, poor working conditions. Electronic equipment is wet or seriously be affected with damp be affected with damp will cause a short circuit or even fire, fault and even fire, loss. Screen may be heavy current strong magnetic attacks caused by lightning.