LCD and LED: How to distinguish in three steps?

Recently, in the Baidu index, the search term "the difference between LCD and LED " is still ranked in the top ten. For so many netizens to doubt the difference between the two, the editor specially organized the relevant knowledge of LCD and LED. For your reference.

First, define the distinction

LCD (short for Liquid Crystal Display) liquid crystal display. The LCD is constructed by placing a liquid crystal cell in two parallel glass substrates, a TFT (thin film transistor) on the lower substrate glass, a color filter on the upper substrate glass, and liquid crystal molecules controlled by signal and voltage changes on the TFT. The direction of rotation is such that the polarization of each pixel is controlled to be emitted or not for display purposes.

LED is the abbreviation of Light Emitting Diode. 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 LED displays are concerned, China's design and production technology levels are basically in line with international standards. The LED display is composed of LED arrays. It adopts low-voltage scanning drive, which has the characteristics of low power consumption, long service life, low cost, high brightness, less failure, large viewing angle and long visible distance.

Second, the principle of backlight distinction

In the current market, liquid crystal displays are mainly divided into two categories, one is a liquid crystal display using a conventional CCFL (cold cathode fluorescent tube), and the other is a liquid crystal display using an LED (light emitting diode) backlight. Many consumers directly refer to the first type of display as an LCD and the second type of display as an LED. In fact, such a statement is incorrect. Therefore, when distinguishing between LCD and LED, it can also be distinguished from its backlight principle.

LED backlight principle

The LED backlight uses a light-emitting diode as a backlight source. Light-emitting diodes are made up of several layers of very thin doped semiconductor materials, one with an excess of electrons and the other with electrons to form positively charged holes. When working, current flows through, electrons and holes combine with each other. The energy is released in the form of light radiation. Light-emitting diodes of different luminescent properties can be obtained by using different semiconductor materials.

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