TFT (Thin Film Transistor) LCD, which is an active matrix type liquid crystal display (AM-LCD), is widely used because of its fast response time and good display quality. It is used in notebook computers, desktop monitors, LCD TVs, LCD projectors and various large electronic displays.
TFT-LCD concept analysis and process introduction
The TFT type liquid crystal display is relatively complicated, and is mainly composed of a fluorescent tube, a light guide plate, a polarizing plate, a filter plate, a glass substrate, an alignment film, a liquid crystal material, a thin mode transistor, and the like. First of all, the liquid crystal display must first use a backlight, that is, a fluorescent tube to project a light source, which first passes through a polarizing plate and then passes through the liquid crystal. At this time, the arrangement of the liquid crystal molecules changes the angle of the light that penetrates the liquid crystal, and then the light must pass through the front color filter film and the other polarizing plate. Therefore, we can control the intensity and color of the last appearing light by changing the voltage value of the stimulating liquid crystal, so that a color combination of different hues can be changed on the liquid crystal panel.
Each pixel of the TFT-LCD is controlled by TFTs integrated on itself, which are active pixels. Therefore, not only the reaction time can be greatly accelerated, at least 80ms; the contrast and brightness are also greatly improved; and the resolution has been unprecedentedly improved. Because it has higher contrast and richer colors, the screen update frequency is also faster, so we call it “true color.”
Introduction to the three main processes of TFT-LCD
The process in the previous stage is similar to the semiconductor process, but the difference is that the thin film transistor is fabricated on the glass instead of the germanium wafer.
In the middle section, the glass of the previous stage is used as a substrate, and is bonded to the glass substrate of the color filter, and liquid crystal (LC) is poured between the two glass substrates.
Rear section (module assembly)
The rear module assembly process is a production process in which the glass after the Cell process is assembled with other components such as a backlight board, a circuit, and an outer frame.
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