LCD Color Filter用 Millbase 분산 연구

Abstract

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. LCD color filters have been manufactured in a process called photolithography to date, but various printing methods have been studied currently in response to the trend of low-end LCD panels. Screen Printing Process is a suitable fabrication technique to develope pigment components whose dimensions are in nano. The success of this process depends on the systematic preparation of pigment millbase. Conventional millbase dispersions are constituted of the organic pigments, monomer, dispersant and solvents. 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. Subsequently, this thesis attempts to find out the dispersive characteristics as well as the selection of pigments, monomers and dispersants in the part of millbase among the stages of manufacturing LCD color filters using the screen printing methods. The dispersive characteristics were shown through analytic devices such as particle size measurement, rheology behavior, millbase color property, etc.