Color Filter Bridge Portion for Display Light Blocking and Cell Gap
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Solution Overview
Problem
The complexity of the structure and increased manufacturing cost of liquid crystal display apparatus due to the need for additional masks and difficulty in maintaining uniform cell gaps, particularly with sub-column spacers, hinder efficient light blocking and gap maintenance.
Innovation Solution
A display apparatus design that eliminates the need for a black matrix by overlapping color filters and using a bridge portion made of the same material as the second color filter to form a sub-column spacer, maintaining the cell gap and pressing gap effectively without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is used to block light in non-display areas, then light blocking is achieved, but the structure becomes complicated and manufacturing cost increases due to additional masks
Solution Approach 1:
The patent merges the light blocking function with the color filter layer by forming the color filter pattern to extend into the non-display area. The color filter material itself blocks light in these areas, eliminating the need for a separate black matrix layer and reducing structural complexity while maintaining effective light blocking.
Solution Approach 2:
The color filter layer is designed to serve multiple functions: it provides color filtering in the display area and simultaneously acts as a light blocking layer in the non-display area. This multi-functional design eliminates the need for dedicated black matrix structures and reduces the number of manufacturing masks required.
2Manufacturing precision
If sub-column spacers are formed at lower height than main column spacers, then cell gap maintenance is attempted, but uniform positioning and height control become difficult
Solution Approach 1:
The patent combines the sub-column spacer function with the color filter layer by forming the color filter pattern to extend into the non-display area at a lower height. This integrated structure serves both as a light blocking element and as a sub-column spacer, eliminating the need for separate spacer formation processes and achieving uniform cell gap maintenance.
Solution Approach 2:
The color filter pattern is designed in advance to extend into the non-display area, preliminarily establishing the sub-column spacer structure. This preliminary action ensures uniform positioning and height control of the spacers before the liquid crystal layer is assembled, simplifying the overall manufacturing process.
3Object-affected harmful factors
If additional masks are used to form black matrix and sub-column spacers, then light blocking and gap maintenance are achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple functions (light blocking, color filtering, and sub-column spacer formation) into a single color filter layer structure. This integration eliminates the need for separate black matrix and spacer formation masks, reducing the total number of masking steps and lowering manufacturing costs while maintaining effective light blocking and cell gap control.
Solution Approach 2:
The color filter layer is designed to perform multiple functions simultaneously: color filtering in the display area, light blocking in the non-display area, and cell gap maintenance through its extended lower-height portions. This multi-functionality reduces the need for additional components and manufacturing steps, thereby reducing overall manufacturing cost.
Data Source
AI summary
A display apparatus includes pixel areas and a light blocking area between the pixel areas. The display apparatus includes a first base substrate, a thin film transistor, and first, second, and third color filters. The first color filter has a first color, the second color filter has a second color different from the first color, and the third color filter has a third color different from the first and second colors. In the light blocking area, the thin film transistor, the first color filter, and the third color filter at least partially overlap each other. The second color filter in at least one pixel area is connected to an adjacent second color filter disposed in an adjacent pixel area by a bridge portion, and the bridge portion is formed of the same material as the second color filter and is disposed in the light blocking area.