The liquid crystal display can be classified into three types: static, simple matrix, and active matrix. Among them, the passive matrix type can be further divided into twisted nematic (TN), super twisted nematic (STN) and other passive matrix driven liquid crystal displays; active matrix types can be roughly classified as Thin film transistor type (TFT) and two-terminal diode type (Metal/Insulator/Metal; MIM) are two methods.
TN, STN, and TFT liquid crystal displays have differences in viewing angle, color, contrast, and animation display quality due to their different principles of twisting of liquid crystal molecules, making it possible to classify products in their application range. In terms of the scope and level of application of the current liquid crystal display technology, the active matrix drive technology is based on a thin film transistor (TFT) type, and is widely used in notebook computers, animation, and image processing products. The simple matrix drive technology is currently based on twisted-nematic (TN) and super-twisted-neutral (STN). The current applications are mostly word processors and consumer products. Among these, TFT LCDs require high capital investment and technical requirements, while TN and STN require relatively low technology and capital requirements.