Patent ID: 7639321
Filing Date: 2009-12-29
Classification: G02F

Abstract:
1. A method for manufacturing a color filter substrate for an LCD device comprising the steps of: preparing a substrate having a plurality of color filter regions and a black matrix region; selectively etching the black matrix region of the substrate using an etching gas containing HF to form a trench in the black matrix region of the substrate at substantially a 10 μm depth; forming red, green and blue color filters respectively in the color filter regions of the substrate and sequentially overlapping a portion of the red, green and blue color filters to form a black matrix overlying the trench, wherein the step of forming the red, green and blue color filters comprises depositing a red color resist on the entire surface of the substrate including the trench and selectively patterning the red color resist; hardening only the red color resist at a high temperature of 230° C.; depositing a green color resist on the entire surface of the substrate including the red color resist in the trench and selectively patterning the green color resist; depositing a blue color resist on the entire surface of the substrate including the green color resist in the trench and selectively patterning the blue color resist; wherein forming the trench and selectively patterning the overlapping portion of the red, green and blue color filters in the trench defines the black matrix on the substrate; performing a chemical mechanical polishing process to form a continuous upper surface across the color filters in the color filter regions and the black matrix, wherein each of the red, green and blue color filters in the color filter regions has the same height as that of the black matrix; forming a common electrode overlying the substrate and the red, green and blue color filters and the black matrix;