Many devices in our daily lives use LCD screens,, LCD stands for Liquid Crystal Display, which is a general term for liquid crystal display technology. According to the driving method, it can be divided into three types: static driving, simple matrix driving, and active matrix driving. According to the different rotation angles of liquid crystal molecules inside the liquid crystal cell, we divide the liquid crystal display screen into different working modes, and different working modes will result in different display effects displayed on the screen.
TN (Twisted Nematic) is a new liquid crystal material developed after DSM type liquid crystal materials. The emergence of TN laid the foundation for the main development of LCD today. Subsequent products such as HTN, STN, FSTN, DFSTN, etc. are all derived from TN. Their differences lie in the arrangement, twist angle, and circuit aspects of the liquid crystal.
TN,HTN,STN,FSTN,DFSTN, The structure is basically the same, TN is generally twisted at 90 degrees, HTN is twisted at 90-120 degrees, and STN is twisted at 180-270 degrees, FSTN,DFSTN, Both are STN, and STN LCD screens have yellow green mode, blue mode, gray mode, and so on depending on the twist angle and angle of the polarizing plate; TN LCD screens have both positive and negative characteristics. FSTN and DFSTN have a black or white background appearance. FSTN is a film compensated STN, while DFSTN uses a dual FSTN structure to achieve black and white display.
The core feature of VA liquid crystal is that its liquid crystal molecules are arranged vertically to the glass substrate, that is, in the absence of voltage, the liquid crystal molecules are arranged vertically.