LED is a light emitting diode, a solid-state semiconductor device that can directly convert electricity into light. The heart of LED is a semiconductor wafer. 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 wafer is encapsulated by epoxy resin. The semiconductor wafer consists of two parts, one is P semiconductor, the other is N semiconductor, and the other is electron. But when these two semiconductors are connected, a "P-N knot" is formed between them. When the current is acting on the wafer through the wire, the electrons will be pushed to the P region. In the P area, the electrons will be combined with the holes, then the energy will be emitted in the form of photons, which is the principle of LED luminescence. And the wavelength of the light is the color of the light, which is determined by the material that forms the P-N junction. LCD Liquid Crystal Display liquid crystal display is referred to as the structure of the LCD is placed in the liquid of two pieces of parallel glass crystal, fine wire and many vertical and horizontal between two pieces of glass, through the power to control the rod crystal molecules change the direction of light rays are refracted out screen.
LED and LCD have a fundamental difference, first of all is the different light light source, second is the difference of display effect, LCD can display fine picture, LED can not.
LCD and LED are two different display techniques, LCD is a display of liquid crystals, and LED is a display of light-emitting diodes.
In theory, LED can be made into a large, arbitrary size display, and LCD's current technology can only be about 100 inches.
Compared with the LCD display, the LED display is more advantageous in terms of brightness, power, visual angle and refresh rate. Power LED and LCD ratio is about 10:1, and a higher refresh rate so that LED has better performance in the video, can provide up to 160 degrees wide angle, can display a variety of text, numbers, color image and animation information, you can also play TV, video, VCD, DVD color video signal. Multi picture display can also be broadcast network. The single element reaction speed of the organic LED display is 1000 times as high as that of the LCD LCD screen, and it can also be looked after under the strong light, and is adapted to the low temperature of 40 degrees below zero. Using LED technology, you can produce a thinner, brighter and clearer display than LCD, with a wide range of applications. "