Liquid Crystal Display Panel Scale Pattern Alignment
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Solution Overview
Problem
Liquid crystal display panels face challenges in achieving high aperture ratio and reducing color mixing due to positional displacement between array and color filter substrates, which affects display quality and contrast.
Innovation Solution
Incorporating scale patterns on both substrates made of the same material as the scanning and signal lines, allowing for precise alignment and reducing light shielding layer width, thereby minimizing positional displacement and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a light shielding layer made of metallic film or resin material is used, then the light shielding layer can be formed to overlap with scanning line and signal line to increase aperture ratio, but position aligning error causes the light shielding member to be formed thickly, making it difficult to enhance aperture ratio
Solution Approach 1:
The patent extracts the light shielding function from a separate metallic film or resin layer and integrates it into the color filter structure itself. The color filter layers are designed to extend beyond the pixel boundaries and overlap with the scanning line and signal line regions, thereby providing light shielding functionality without requiring an additional light shielding layer. This eliminates the position aligning error issue associated with separate light shielding layers while maintaining the aperture ratio enhancement.
Solution Approach 2:
The patent merges the light shielding layer with the color filter layers by designing the color filter layers to extend into the regions where light shielding is needed. The color filter layers are formed to overlap with the scanning line and signal line areas, combining the color filtering and light shielding functions into a single integrated structure. This integration eliminates the need for separate light shielding materials and resolves the alignment precision requirements.
2Area of stationary object
If stacked color filter is used as light shielding layer, then aperture ratio can be improved, but high precision is necessary for position alignment and positional displacement causes color mixing
Solution Approach 1:
The patent applies local quality by designing the color filter layers with different extension characteristics in different regions. The color filter layers extend beyond the pixel boundaries in specific directions to overlap with scanning line and signal line regions, providing localized light shielding where needed. This localized extension approach allows aperture ratio enhancement without requiring high precision alignment across the entire substrate, as only specific regions require precise positioning.
3Manufacturing precision
If light shielding layer is made thick to compensate for position aligning error, then alignment error can be tolerated, but aperture ratio cannot be enhanced
Solution Approach 1:
The patent extracts the light shielding function from a separate layer and integrates it into the color filter structure. By designing the color filter layers to extend into the scanning line and signal line regions, the patent eliminates the need for thick light shielding layers while maintaining alignment error tolerance. The integrated design allows thin, precise color filter extensions to provide the same light shielding effect that would otherwise require thicker separate layers.
Data Source
AI summary
A liquid crystal display panel including a first substrate and a second substrate is provided. The first substrate is provided at plural positions with a first scale pattern made of the same material as a scanning line, and extending in a row direction or a column direction, and a second scale pattern made of the same material as a signal line at plural positions, and extending in the row direction or the column direction. The second substrate is provided with a third scale pattern extending in the row direction and a fourth scale pattern extending in the column direction, respectively, at positions which are opposite to the first and second scale patterns.