TFT (thin-film transistor) LCD is an active matrix-type liquid crystal display (AM-LCD), which is widely used in notebook computers, desktop computer monitors, LCD televisions, LCD projectors, and a variety of large-scale electronic displays due to its fast response time and good display quality. It is widely used in notebook computers, desktop computer monitors, LCD TVs, LCD projectors and various large electronic displays.
TFT-LCD concept analysis and process introduction
Each pixel of a TFT-LCD is controlled by a TFT integrated in itself; they are active pixels. As a result, not only can the response time be greatly accelerated, at least up to about 80ms; the contrast and brightness are also greatly improved; and the resolution is also unprecedentedly improved. Because it has higher contrast and richer colors, the screen is updated more frequently, so we call it "True Color".
Introduction to the three main stages of the TFT-LCD process
front-end stage
The front-end process is similar to the semiconductor process, but the difference is that thin-film transistors are fabricated on glass rather than on silicon wafers.
intermediate stage
In the intermediate stage, the glass of the foreground is used as a substrate, the glass substrates of the color filters are combined, and liquid crystals (LC) are injected between the two glass substrates.
Back-end (module assembly)
The back-end module assembly process is a production operation where the glass is assembled with other components such as backlight panels, circuits and bezels after the Cell process.
TFT-type LCDs are more complex, consisting of: fluorescent tubes, light guide plates, polarizing plates, filter plates, glass substrates, orientation films, liquid crystal materials, and thin-mode transistors. First, an LCD must first use a backlight, which is a fluorescent tube to project a light source that will pass through the polarizing plate and then through the liquid crystal. The arrangement of the liquid crystal molecules changes the angle of the light that penetrates the liquid crystals, and then the light must pass through a color filter film and another polarizing plate in front of it. Therefore, we can control the intensity and color of the light that finally appears by changing the value of the voltage that stimulates the liquid crystals, so that color combinations with different shades can be changed on the LCD panel.