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LCD Technology

24 Dec 2018 -

What is LCD?

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.
Now that LCD has replaced CRT as the mainstream, the price has dropped a lot and has been fully popularized.

Liquid crystal displays can be classified into static driving (Static), simple matrix driving (Simple Matrix), and active matrix driving (Active Matrix) according to the driving method. Among them, the passive matrix type can be divided into Twisted Nematic (TN), Super Twisted Nematic (STN) and other passive matrix driven liquid crystal displays; and the active matrix type can be roughly divided into Thin film transistor (TFT) and two-terminal diode type (Metal/Insulator/Metal; MIM).
TN, STN and TFT type liquid crystal displays have different degrees of difference in viewing angle, color, contrast and animation display quality due to their different twisting principles of liquid crystal molecules, so that they are clearly distinguished in the application range of products. In terms of the scope and level of application of liquid crystal display technology, active matrix driving technology is mainly based on thin film transistor (TFT), and is widely used in notebook computers and animation and image processing products. The simple matrix drive technology is mainly based on the twisted nematic (TN) and super twisted nematic (STN). The current applications are mainly paper processors and consumer products. Among them, the liquid crystal display requires a high capital investment and technical demand, while the technical and capital requirements for TN and STN are relatively low.


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