In TN and STN LCD, the only way to drive the electrodes is to drive the X-axis and Y-axis. Therefore, if the display part is larger and larger, the electrode reaction time of the central part may be longer. In order for the screen to display consistently, the overall speed will slow down. Simply put, it's like the screen update frequency of CRT monitor is not fast enough. That's when the user feels the screen flicker and jump. Or when a fast 3D animation display is needed, but the display speed of the display can not keep up with it, and the display may be delayed. Therefore, the early LCD display has certain size limitations, and it is not suitable for watching movies or playing 3D games.
In order to improve this situation, liquid crystal display technology used active-matrix addressing to drive later. This is the ideal device to achieve high data density liquid crystal display effect, and the resolution is very high. The method is to use the silicon transistor electrodes made of thin film technology to select any display point (pixel) switch by scanning method. In fact, the non-linear function of thin film transistor is used to replace the non-linear function of liquid crystal which is difficult to control. In TFT type liquid crystal display, thin wire-like lines are drawn on conductive glass, and the electrodes are matrix switches arranged by thin-film transistors. At the intersection of each line, there is a control box. Although the driving signal is scanned quickly at each display point, only the transistor matrix on the electrodes is selected. The display point can drive the voltage of liquid crystal molecule enough to turn the axis of liquid crystal molecule into a "bright" contrast. The unselected display point is naturally a "dark" contrast, thus avoiding the dependence of the display function on the electric field effect ability of liquid crystal.
