LCD Transparent Layer Convex Shape for Cell Gap
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Solution Overview
Problem
Current liquid crystal displays (LCDs) face challenges in maintaining a uniform cell gap and aperture ratio due to misalignment of pixel electrodes and color filters, leading to image quality defects and increased light-blocking layer size.
Innovation Solution
A liquid crystal display design where a light-blocking layer with organic black pigment and a transparent layer of different shapes are formed simultaneously, with the transparent layer having a convex shape to support the gap between substrates, enhancing alignment and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-blocking layer is formed larger than a predetermined size based on align margin to prevent misalignment, then alignment reliability is improved, but the aperture ratio deteriorates due to increased light-blocking area
Solution Approach 1:
The light-blocking structure is divided into two distinct layers: a light-blocking layer for preventing misalignment and a transparent layer for maintaining aperture ratio. This segmentation allows each layer to perform its specific function without compromising the other, resolving the contradiction between alignment reliability and aperture ratio
Solution Approach 2:
The transparent layer is positioned specifically at the corners of the light-blocking layer, providing localized support where it is most needed for maintaining cell gap uniformity. This local quality approach ensures that the light-blocking layer can be larger for reliability without proportionally increasing the light-blocking area that would reduce aperture ratio
2Ease of manufacture
If pixel electrodes and color filters are formed in different display panels, then manufacturing flexibility is improved, but alignment precision deteriorates due to difficulty in precise alignment
Solution Approach 1:
The light-blocking layer is formed with extended margins beyond the pixel electrode boundaries before the actual pixel formation process. This preliminary action creates a reference structure that guides subsequent alignment operations, ensuring high alignment precision while maintaining the flexibility of forming components in separate panels
Solution Approach 2:
The light-blocking layer acts as an intermediary structure between the pixel electrode and color filter layers. It provides a stable reference framework that facilitates precise alignment during assembly, bridging the gap between manufacturing flexibility and alignment precision requirements
3Device complexity
If the cell gap is not uniform, then device complexity is reduced, but image quality deteriorates due to non-uniform image display
Solution Approach 1:
The transparent layer is formed with a convex shape that provides curved surface support across the cell gap. This curvature design naturally distributes mechanical stress uniformly, maintaining consistent cell gap thickness throughout the display area without requiring complex adjustment mechanisms
Solution Approach 2:
The transparent layer changes the physical parameters of the cell gap structure by providing mechanical support and maintaining uniform spacing between substrates. This parameter control ensures consistent cell gap uniformity while keeping the overall structure relatively simple
Data Source
AI summary
A liquid crystal display (LCD) includes a thin film transistor positioned on a lower substrate; a plurality of color filters positioned on the thin film transistor and aligned to be spaced apart from each other; an insulation layer positioned on the plurality of color filters; a light-blocking layer positioned on the insulation layer; a transparent layer positioned on the light-blocking layer and having a convex shape; an upper substrate facing the lower substrate; and a liquid crystal layer interposed between the lower substrate and the upper substrate, wherein the light-blocking layer includes an organic black pigment, and the transparent layer having the convex shape has a different shape from the light-blocking layer.