LCD Color Filter Indented Portions for Cell Gap Control
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Solution Overview
Problem
The manufacturing process of liquid crystal display (LCD) devices with separate color filter and thin film transistor substrate layers is complex, leading to alignment issues and potential disconnection of pixel electrodes due to inconsistent cell gaps.
Innovation Solution
A liquid crystal display device design where the color filter is disposed above the thin film transistor substrate, with a specific layer structure that includes indented and protruding portions in the color filters to maintain a constant cell gap and prevent electrode disconnection, featuring a contact portion between adjacent color filters and extending electrode portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter substrate and thin film transistor substrate are manufactured separately and attached to each other, then the manufacturing process becomes complex, but alignment between the two substrates becomes difficult to achieve
Solution Approach 1:
The patent combines the color filter layer and thin film transistor substrate into a single integrated substrate structure. The color filter layer is formed directly on the thin film transistor substrate, eliminating the need for separate substrate manufacturing and attachment processes. This integration resolves the contradiction by simplifying the manufacturing process while ensuring precise alignment between the color filter and transistor components through the unified substrate structure.
2Ease of manufacture
If the color filter is included in the thin film transistor substrate, then manufacturing is simplified, but cell gaps become inconsistent and electrodes may disconnect
Solution Approach 1:
The patent introduces indented portions in the color filter layer at specific locations where electrodes extend from pixels. These localized indentations create sufficient cell gap space to accommodate the extending electrodes, preventing disconnection. The local modification of the color filter structure maintains overall manufacturing simplicity while ensuring reliable electrode connections at critical points.
Solution Approach 2:
The indented portions are pre-formed in the color filter layer during the manufacturing process, before electrode extension occurs. This preliminary structural preparation ensures that when electrodes extend from the pixels, there is already adequate space available, preventing disconnection issues and ensuring reliable electrical connections.
3Manufacturing precision
If adjacent color filters contact each other, then layer alignment is improved, but cell gap consistency deteriorates
Solution Approach 1:
The patent implements indented portions in the color filter layer at specific locations where electrodes extend, creating localized variations in the color filter structure. These indentations maintain cell gap consistency at electrode extension points while allowing color filter contact in other regions for proper alignment. The local structural modification resolves the contradiction by differentiating between regions requiring contact versus regions requiring gap space.
Data Source
AI summary
A liquid crystal display device includes a first display substrate, a second display substrate, and a liquid crystal layer disposed between the first and second display substrates. The first display substrate further includes a first pixel electrode and a second pixel electrode, a first color filter and a second color filter disposed below and overlapping the first pixel electrode and the second pixel electrode, respectively, a first thin film transistor, and a contact portion connecting the first thin film transistor to the first pixel electrode. The first color filter and the second color filter contact each other, and one of the first color filter and the second color filter includes an indented portion partially surrounding the contact portion. A portion of the one of the first color filter and the second color filter is spaced apart from a portion of the other with the contact portion disposed therebetween.