TFT-LCD Concept Analysis And Process Introduction

TFT (Thin Film Transistor) LCD, namely film field effect transistor LCD, is one of the active matrix type liquid crystal displays (AM-LCD). Because of its fast reaction time and good display quality, it is suitable for large animation display and is widely used in notebook computers, desktop computer displays, LCD TVs, LCD projectors and various large electronic displays.

TFT-LCD concept analysis and process introduction

Each pixel of TFT-LCD is controlled by TFT integrated on itself. They are active pixels. Therefore, not only can the reaction time be greatly accelerated, but at least it can reach about 80ms; The contrast and brightness are also greatly improved; At the same time, the resolution has also been improved unprecedentedly. Because it has higher contrast and richer colors, and the screen updates more frequently, we call it "true color".

Introduction to three main processes of TFT-LCD

Anterior segment

The previous process is similar to the semiconductor process, but the difference is that the thin film transistor is fabricated on glass instead of silicon wafer.

middle part

The middle section is based on the glass of the previous section, which is combined with 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 the production operation of assembling the glass after the cell process with other components such as backlight, circuit, frame, etc.

TFT type liquid crystal display is relatively complex, mainly composed of fluorescent tubes, light guide plates, polarizing plates, filter plates, glass substrates, alignment films, liquid crystal materials, thin mode transistors, etc. First of all, the LCD must first use the backlight, that is, the fluorescent tube to project the light source. These light sources will pass through a polarizer first and then through the LCD. At this time, the arrangement of liquid crystal molecules will change the angle of light passing through the liquid crystal, and then the light must pass through the front colored filter film and another polarizer. Therefore, we can control the last light intensity and color as long as we change the voltage value to stimulate the liquid crystal, so that we can change the color combination with different tones on the liquid crystal panel.