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The main components of TFT LCD include fluorescent tube, light guide plate, polarizer, filter plate, glass substrate, alignment film, liquid crystal material, thin mode transistor and so on. Firstly, the LCD must first use the backlight, that is, the fluorescent tube to project the light source. These light sources will first pass through a polarizing plate and then pass through the liquid crystal. At this time, the arrangement of liquid crystal molecules will change the light angle penetrating the liquid crystal. Then the light must pass through the front color filter film and another polarizer. Therefore, as long as we change the voltage value of stimulating liquid crystal, we can control the light intensity and color at last, and then change the color combination with different depths on the liquid crystal panel.

LCD screen

Liquid crystal display technology is driven by active matrix addressing, which is an 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 electrode made of thin film technology and use the scanning method to select the on and off of any display point (pixel). In fact, this is to use the nonlinear function of thin film transistor to replace the non-linear function of liquid crystal which is not easy to control. As shown in the figure above, in the TFT LCD, the conductive glass is painted with small wire like lines, and the electrodes are matrix switches arranged by thin-film transistors. There is a control box at the intersection of each line, although the driving signal quickly scans through each display point, However, only the selected display point in the transistor matrix on the electrode can obtain a voltage sufficient to drive the liquid crystal molecules to turn the axis of the liquid crystal molecules into a "bright" contrast. The unselected display point is naturally a "dark" contrast, which avoids the dependence of the display function on the response ability of the liquid crystal electric field.