In the TN and STN type liquid crystal displays, the simple driving electrodes are driven by the crossing of the X and Y axes, as shown in Figure 2, so if the display part becomes larger and larger, the central part The electrode reaction time may be longer. In order to make the screen display consistent, the overall speed will be slower. To put it simply, it is as if the screen update frequency of the CRT monitor is not fast enough, that is, the user will feel the screen flickering and jumping; or when a fast 3D animation is required, but the display speed of the monitor cannot keep up. There may be a delay in the displayed results. Therefore, the early LCD monitors had certain limitations in size, and were not suitable for watching movies or playing 3D games.
In order to improve this situation, later LCD technology adopts active-matrix addressing mode to drive, which is the ideal device to achieve the effect of high data density liquid crystal display, and the resolution is very high. The method is to use the silicon transistor electrodes made of thin film technology, and use the scanning method to select any one display point (pixel) on and off. This is actually using the nonlinear function of the thin film transistor to replace the non-linear function of the liquid crystal which is not easy to control. As shown in Figure 2, in the TFT type liquid crystal display, the conductive glass is drawn with small net-like lines, the electrodes are made of matrix switches arranged by thin film transistors, and there is a control box at the intersection of each line. , although the driving signal scans quickly at each display point, only the selected display point in the transistor matrix on the electrode receives a voltage sufficient to drive the liquid crystal molecules, so that the axis of the liquid crystal molecules is turned to form a "bright" contrast, which is not affected by The selected display point is naturally a "dark" contrast, thus avoiding the dependence of the display function on the electric field effect capability of the liquid crystal.
