Post Spacer Height Variation for LCD Detection Accuracy
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Solution Overview
Problem
Current liquid crystal display devices face challenges in accurately detecting main post spacers, which can lead to poor production quality due to mis-recognition or mis-detection.
Innovation Solution
A display substrate design that includes a base substrate with sub-pixels arranged in an array, featuring main post spacers and sub post spacers of varying heights, along with mark sub-pixels without post spacers. This configuration allows for accurate detection of main post spacers by identifying adjacent mark sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple post spacers of the same height are provided to ensure sufficient support strength, then structural stability is improved, but detection accuracy deteriorates due to inability to distinguish main post spacer from sub post spacers
Solution Approach 1:
The patent applies local quality by making the main post spacer have a different height (first height) compared to sub post spacers (second height). This local differentiation in the height parameter enables detection systems to distinguish the main post spacer from sub post spacers, thereby improving detection accuracy while maintaining sufficient structural support through the presence of multiple post spacers.
Solution Approach 2:
The patent employs asymmetry by creating an asymmetric height distribution among post spacers, where the main post spacer has a greater height than sub post spacers. This asymmetric design provides a clear visual and dimensional distinction that facilitates accurate identification and detection of the main post spacer, resolving the contradiction between structural stability and detection accuracy.
2Measurement precision
If main post spacer height is increased to improve detectability, then detection accuracy is improved, but structural uniformity deteriorates due to height variation
Solution Approach 1:
The height variation is applied locally only to the main post spacer, while sub post spacers maintain a consistent second height. This localized differentiation provides sufficient detectability for the main post spacer without creating widespread structural non-uniformity, as the majority of post spacers (sub post spacers) maintain uniform height for structural support.
3Ease of manufacture
If post spacer arrangement is simplified to improve manufacturing, then manufacturing complexity is reduced, but detection reliability deteriorates due to lack of distinctive patterns
Solution Approach 1:
The patent uses height variation as a visual distinction analogous to color changes, where the main post spacer's greater height creates a distinguishable feature that improves detection reliability. This approach maintains relatively simple manufacturing processes while providing a clear identifier for the main post spacer through the height difference from sub post spacers.
Data Source
AI summary
A display substrate is provided, including: a base substrate; a plurality of sub-pixels arranged on the base substrate in an array in a row direction and a column direction; a plurality of post spacers arranged at intervals on the base substrate, wherein the plurality of post spacers include at least one main post spacer and a plurality of sub post spacers, and each main post spacer has a height greater than that of each sub post spacer. Each sub-pixel has at most one post spacer provided therein, the plurality of sub-pixels include a main sub-pixel provided with the main post spacer and a sub sub-pixel provided with the sub post spacer, and the plurality of sub-pixels further include at least one mark sub-pixel adjacent to the main sub-pixel in the row direction or the column direction, the at least one mark sub-pixel is provided with no post spacer.