LCD Color Filter用 Color Resist 분산 및 Pattern 형성 연구

Abstract

In the Information Society, we check a lot of information in our eyes through a display. In terms of such display, diverse kinds of displays are developed and actually used. Among these, in respect of the display to construct the gigantic information service network, TFT-LCD is most frequently utilized. On the other hand, as the various displays are developed, a fateful issue such as a cost reduction has been raised. Subsequently, it is required for TFT-LCD, which leads a FPD market, to lower the manufacturing prime cost. It is urgently request to reduce the cost of the color filter which has the most expensive cost in terms of LCD panel manufacturing. This color filter is an essential material to colorize the non-emissive LCD. The existing color filter manufacturing methods include electrodeposition, printing, dye method(photopolymer pattern dye method), and pigment dispersion(photolithography method using pigment dispersed photopolymer). Of these methods, pigment dispersion method is considered to be most appropriate and it has been widely used for the manufacturing of color filters recently. However, the pigment dispersion method currently used is photolithography process and it requires various processes to manufacture color filters. Therefore, the cost is high. But with the development of diverse displays, cut down of LCD panel cost is needed urgently and a color filter manufacturing method that will replace the pigment dispersion method is needed. This study tries to develop TFT LCD color filter manufacturing technology using screen printing method as a method to replace the pigment dispersion method. The purpose of this study is to establish the manufacturing technology regarding the LCD purpose color filter by way of a screen printing type. Hence, the author reviewed the characteristics of pigment dispersion of millbase which consisted of the color filter, polymerization of oligomer in base resin, characteristics of screen printing in color filter's color resist which combined these two, and characteristics of rheology in color resist. In particular, with respect to the characteristics of pigment dispersion in the course of millbase, the author studied and reviewed the optimal condition in dispersion such as characteristics of dispersion and dispersion time, etc. pursuant to the dispersant and monomer. To manufacture the color resist, the author compounded the ester type, epoxy type, urethane type, and UV type acrylate resin in respect of the polymerization in base resin. And the author studied and reviewed the printability in screen printing pursuant to the viscosity of color resist and analyzed the rheology and pattern according to the result of optimal pattern. In addition, the author examined the characteristics of color in terms of color filter.