Figure 1 TFT-LCD architecture and module full project
Generally, LCDs are filled with a liquid crystal layer with a thickness of about 34um between the upper and lower transparent electrodes. The electric field of the liquid crystal interlayer is controlled by the method of filling the pixel (Pixel) electrode voltage, and then the intensity of the transmitted light is adjusted to produce a full brightness. Graylevel between and full darkness. At present, LCD is mainly composed of three parts: color filter (CF), TFT array (TFTArray) substrate and backlight module (Backlight) as shown in Figure 1(a). Each Pixel of TFT-LCD has a set of TFTs to control its voltage value, and if the light generated by the backlight module and transmitted through the LC has different colors, red, blue, and green (R/B/G) are needed. The color resists of three colors are formed on the CF glass, and the gray scales are used to produce a full-color effect; after the TFT array and the CF substrate are respectively completed, then the CF upper plate and the TFT lower plate are filled with LC and bonded together, Finally, attach the polarizer (Polarizer), this process is called "LCD process"; and the last "LCM process", which is the connection between the driver IC and the control circuit board (PCBA) and the glass substrate (JIProcess), and then The backlight module is assembled (MAProcess), and finally is the lighting detection of the module... and so on as shown in Figure 1(b).
Advantages of AUOTFT-LCD process technology
Figure 2 Glass substrate size
Vigorously implement green production technology
The development direction of next-generation process technology is nothing more than simplifying the process and selecting optimized raw materials and components to increase process yield and productivity, and reduce production costs. The capital investment of the front-end TFTArray and CF process equipment accounts for more than 60 percent of the total TFT-LCD expenditure. Therefore, the front-end process research and development first focuses on simplifying the process and improving the utilization of raw materials: for example, the four-channel mask technology that simplifies the mask process (see Figure 3 (a)) and the pattern forming method without exposure and etching. In addition, the use of thinned glass substrates not only reduces the consumption of glass raw materials, but also has the advantages of lighter weight and thinner products; at the same time, it can achieve the goals of energy saving and waste reduction such as reducing packaging materials and improving transportation efficiency. As for LCM, with the rapid development of gate drive circuit substrate technology (GateonArray, GOA) and HSD (Halfsourcedriving) technology in Figure 3(b), it not only simplifies the material dependence of traditional panels on a large number of driver ICs, but also helps LCM production capacity increased. In terms of module backlights, replacing traditional cold cathode tubes with light emitting diodes (LEDs) not only avoids the harm of mercury (Hg) vapor in the tubes to the environment; the better luminous efficiency of LEDs also makes products more energy-saving.
Figure 3 (a) Figure 3 (b) Figure 3. Maijing Electronics adopts green production technology
Based on TFT-LCD process technology, bravely break into the blue ocean of panels
Figure 4 (a) Figure 4 (b) Figure 4.3D and the rise of new applications such as touch panels
The current LCD industry has undergone fundamental changes, from the pursuit of mass production scale in the past to the development of improving the core competitiveness of the enterprise and the added value of products. Faced with the new situation, Xunrui is based on the experience of the large-area TFT production process in the front stage, and the excellent performance of the back-end electronic control drive and opto-mechanical design and assembly. It is gradually planning and rapid based on the existing TFT-LCD process technology. Realize the next 10 years of the panel industry. This wave of panel changes includes 3D (Figure 4(a)), touch panel (Figure 4(b))... etc. in terms of new applications; the layout of new technologies is the continuous development of organic light-emitting diodes (OLED), field emission E-paper and other emerging display technologies.
