LED & LCD

- Dec 25, 2020-

LED: Abbreviation for Light-Emitting Diode. A type of semiconductor diode that can convert electrical energy into light energy. Like ordinary diodes, light-emitting diodes are composed of a PN junction and also have unidirectional conductivity. The holes injected from the P area to the N area and the electrons injected from the N area to the P area recombine with the electrons in the N area and the holes in the P area within a few microns of the PN junction to generate spontaneous emission fluorescence. The light-emitting principle of LED is to use the combination of two carriers under certain conditions, and the released energy is released in the form of photons to emit light. Depending on the material, the energy levels occupied by electrons and holes are different (the relative energy level difference between electrons and holes can determine the level of energy emitted by the combination of the two carriers). Photons of different energy can be generated to control The wavelength of light emitted by the LED, that is, the spectrum or color.

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LED applications can be divided into two categories: one is LED display; the other is LED single tube application, including backlight LED, infrared LED and so on. As far as the LED display is concerned, it has the following characteristics: low power consumption, long service life, low cost, high brightness, few failures, large viewing angle, and long visual distance.

The difference between LCD and LED: Compared with LCD display, LED display has advantages in brightness, power consumption, viewing angle and refresh rate. Using LED technology, a thinner, brighter, and clearer display than LCD can be manufactured.


1. The power consumption ratio of LED to LCD is about 1:10, LED is more energy-efficient;


2. LED has a higher refresh rate and better performance in video;


3. LED provides a wide viewing angle of 160°, which can display various text, numbers, color images and animation information, and can also play color video signals such as TV, video, VCD, DVD, etc.;


4. The reaction speed of a single element of the LED display is 1000 times that of the LCD screen. It can also be illuminated under strong light and can adapt to the low temperature of minus 40 degrees.