Color filter manufacturing process and development TFT Display Module

With the rapid development of color display, LCD color of irreversible. By 2010, LCD colorization ratio will reach 94%. A color filter (color filter, referred CF) for the LCD to achieve color display key components, the performance (mainly opening ratio, color purity, color) directly affect the liquid crystal panel color reduction, brightness, contrast. The color filters also accounted for the cost of the LCD panel 25% of the total cost. lcm module
The basic structure of the color filter is mainly a glass substrate, BM (black matrix), a color resist, a protective layer (OC), ITO, spacer. The conventional color filter manufacturing process mainly staining (Dyeing Method), the pigment dispersion (Pigment Dispersed Method), electrodeposition (Electro Deposition Method), printing (Printing Method), in which the pigment dispersion based method. At present, many companies have developed a number of practical value of the new method of production applications, especially in large-size color filter production, such as DuPont thermal multilayer technology (Thermal multi-layer tech.), Toppan Printing (Toppan ) of reverse printing method (Reverse printing method) and Dai Nippon Printing (DNP) inkjet printing method (Ink Jet printing). Among them, the Dai Nippon Printing has over its six-generation line of ink-jet printing method used. Further, according to the structure design, a new type of color filter and COA type transflective type.
Conventional color filter manufacturing method
Staining using a dye as a coloring agent, gelatin, or acrylic resin used as the resin material. Their process are coated, exposed and developed, stained cured using this process has been the BM patterned on a glass substrate prepared separately three times R, G, B three-color resist. CF staining method were cheap, colorful, high transmittance, but the heat and light of the poor, is not suitable for high-end LCD. Electrodeposition method is mainly a polyester resin, a pigment as a coloring agent. Electrodeposition first obtained by exposure and development patterned ITO, and were deposited on the ITO R, G, B three color resist, and then by coating, exposure, developing obtain BM. Prepared by electrodeposition color lithography resist just once, but the cost is not an advantage. Pigment in the pigment dispersion method as a coloring agent, a resin acrylic. The main process of coating, exposure, development, preparation R, G, B three color resist the process involves the following three. The pigment dispersion process is relatively simple, good weather resistance, the current majority of small and medium size color filter using this method. The resin is an epoxy resin printing method, a pigment as a coloring agent. The main process roller paint adhesion, printing, the BM has been patterned on a glass substrate to obtain a color resist. Printed legal process is simple, but the accuracy is not high. serial 20x2 lcd
In addition to the four methods described above, there are dispersion dyes, pigments etching, but are due to process complexity, high cost, is rarely used.