TFT (Thin Film Transistor) LCD is a kind of active matrix type liquid crystal display (AM-LCD), which is widely used in notebook computers, desktop computer monitors, LCD TVs, LCD projectors and various large electronic displays because of its fast response time and better display quality. It is widely used in notebook computers, desktop monitors, LCD TVs, LCD projectors and various large electronic displays.
TFT-LCD Concept Analysis and Process Introduction
Each pixel of TFT-LCD is controlled by the TFT integrated in itself, and they are active pixels. As a result, not only the response time can be greatly accelerated, at least to about 80ms; the contrast and brightness are also greatly improved; and the resolution is also improved to an unprecedented extent. Because it has higher contrast and richer colors, the screen is updated more frequently, so we call it "true color".Introduction of the three main stages of TFT-LCD process
Front Stage
The front-end process is similar to the semiconductor process, but the difference is that the thin-film transistors are made on glass instead of silicon wafers.
Middle Stage
In the middle stage, the glass of the front stage is used as the substrate, and the glass substrate of the color filter is combined, and liquid crystal (LC) is injected between the two glass substrates.
Back-end (Module Assembly)
The back-end module assembly process is the production operation of assembling the glass after the Cell process with other components such as backlight panels, circuits, and bezels.
TFT type LCD is more complex, mainly composed of: fluorescent tube, light guide, polarizer, filter plate, glass substrate, orientation film, liquid crystal material, thin mode transistor, etc. First, 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 through the liquid crystal. 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 a colored filter film and another polarizing plate in front of it. Therefore, we can control the intensity and color of the light that appears at the end by changing the voltage value that stimulates the liquid crystal, so that the color combination with different tones can be changed on the LCD panel.