Liquid Crystal Display Colored Member Spacer Design
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Solution Overview
Problem
In liquid crystal displays, accurate alignment between pixel electrodes and color filters is difficult due to their formation on different panels, leading to potential alignment errors, and the process of forming spacers to maintain a constant cell gap is complex and prone to errors.
Innovation Solution
A liquid crystal display design where the first and second color filters are partially overlapped with a colored member on the same substrate, with the colored member's height varying to function as both a light shield and a subspacer, preventing smear defects without the need for an additional sub-spacer formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrode and color filter are formed on different display panels, then manufacturing process is simplified, but alignment accuracy deteriorates
Solution Approach 1:
The patent merges the pixel electrode and color filter formation processes onto the same display panel. This integration ensures that the pixel electrode and color filter are formed simultaneously with identical positioning, eliminating alignment errors between separate panels while maintaining manufacturing efficiency through a unified process flow.
2Device complexity
If main spacer and sub-spacer are formed using the same layer with controlled exposure, then process complexity is reduced, but desired step formation becomes difficult
Solution Approach 1:
The patent applies local quality by forming the spacer layer with spatially varying thickness. The exposure process is locally controlled to create different step heights in different regions, allowing the main spacer and sub-spacer to be formed from a single layer with precise local thickness control, thus achieving both process simplicity and formation accuracy.
3Productivity
If sub-spacer formation process is eliminated, then manufacturing time is reduced, but smear defect prevention capability may deteriorate
Solution Approach 1:
The patent combines the sub-spacer function with the main spacer layer by forming both structures from the same material layer with different local thicknesses. This merging eliminates the need for a separate sub-spacer formation process, reducing manufacturing steps while maintaining the dual-height structure necessary for preventing smear defects through proper cell gap maintenance.
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes: a first substrate; a first signal line disposed on the first substrate, a thin film transistor connected with the first signal line, a first color filter and a second color filter disposed on the first substrate; a colored member disposed on the first color filter and the second color filter; and a pixel electrode disposed on the first color filter and the second color filter and the colored member, wherein the first color filter and the second color filter are partially overlapped with each other and the height of the colored member disposed at the overlap between the first color filter and the second color filter is greater than the height of the colored member disposed not at the overlap.