source:other news release time:2023-06-28 Hits: Popular:led screen wholesaler
In TN and STN type liquid crystal displays, the method of simply driving the electrodes is to use the cross mode of the X and Y axes to drive, as shown in the following figure. Therefore, if the display part becomes larger, the electrode reaction time in the center part may be longer. In order to ensure consistent screen display, the overall speed will decrease. Simply put, it's like if the screen update frequency of a CRT monitor is not fast enough, and users will feel the screen flickering and bouncing; Or when a fast 3D animation display is needed, but the display speed cannot keep up, there may be a delay in the displayed results. So, early LCD displays had certain limitations in size and were not suitable for watching movies or playing 3D games.
In order to improve this situation, LCD display technology later adopted an active matrix addressing method to drive, which is currently an ideal device for achieving high data density LCD display effects with extremely high resolution. The method is to use thin film technology to make silicon transistor electrodes, and use scanning method to select the on and off of any display point (pixel). This is actually using the nonlinear function of thin film transistors to replace the difficult to control nonlinear function of liquid crystals. As shown in the above figure, in a TFT type liquid crystal display, small wires are drawn on the conductive glass in the shape of a grid, and the electrodes are arranged as matrix switches made of thin film transistors. At the intersection of each circuit, there is a control box. Although the driving signal quickly scans through each display point, only the selected display points in the transistor matrix on the electrode receive enough voltage to drive the liquid crystal molecules, By turning the axis of liquid crystal molecules to create a "bright" contrast, the unselected display point naturally becomes a "dark" contrast, thus avoiding the dependence of display function on the electric field effect ability of liquid crystals.
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