Display Device Spacer Offset Compensation
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Solution Overview
Problem
In liquid crystal display devices, manufacturing offsets can lead to non-uniform cell gaps and impaired display quality due to misalignment of spacers and electrical connectivity issues between electrodes and wires.
Innovation Solution
The display device incorporates strategically positioned spacers and spacers with offset centers relative to the black matrix portions, ensuring consistent overlap of active element sources and drains, even with manufacturing offsets, thereby maintaining uniform cell gaps and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are arranged between upper and lower substrates to control cell gap sizes, then uniform cell gap distribution is achieved, but alignment offset causes spacers to miss preset positions resulting in non-uniform cell gaps
Solution Approach 1:
The black matrix is divided into multiple portions (first portions and second portions) with different characteristics. First portions overlap first signal lines while second portions overlap second signal lines, creating local variations in the black matrix structure that enable differential alignment compensation across different regions of the display device.
Solution Approach 2:
The patent introduces asymmetric offset distances between the black matrix portions and spacers. The first offset distance between first portions and first spacers differs from the second offset distance between second portions and second spacers, creating an asymmetric compensation mechanism that counteracts alignment offsets in different directions.
2Reliability
If through holes are formed to connect common electrode with wires, then electrical connectivity is established, but alignment offset prevents normal electrical connection resulting in non-uniform voltage distribution
Solution Approach 1:
The black matrix portions are pre-positioned to overlap with signal lines before the through hole formation process. This preliminary alignment creates reference structures that guide subsequent through hole placement, ensuring that even if offset occurs during through hole formation, the holes remain within acceptable alignment tolerances.
Solution Approach 2:
The black matrix portions serve as intermediary reference structures between the signal lines and the through holes. By establishing these intermediate alignment markers, the patent decouples the alignment process into two stages: first aligning black matrix to signal lines, then aligning through holes to black matrix portions, thereby reducing cumulative alignment errors.
3Manufacturing precision
If spacers are positioned to overlap active element sources and drains, then cell gap control is improved, but alignment offset reduces overlap consistency leading to display quality decline
Solution Approach 1:
The patent varies the offset parameters between different black matrix portions and their corresponding spacers. By changing the offset distance and direction for different portions, the system creates a compensation effect where spacers maintain consistent overlap with active element sources and drains despite overall alignment offsets in the manufacturing process.
Data Source
AI summary
A display device includes a first substrate, first signal lines, second signal lines, active elements, pixel electrodes, a second substrate, a black matrix, a first spacer, and a second spacer. The active elements are electrically connected with the first signal lines and the second signal lines. The black matrix includes first portions and second portions. The first portions overlap the first signal lines. The second portions overlap the second signal lines. The first spacer overlaps a source and a drain of one of the active elements. The second spacer overlaps a source and a drain of another one of the active elements. The shortest distance between the center of the first spacer and the center line of the closest one of the first portions is different from the shortest distance between the center of the second spacer and the center line of the closest one of the first portions.