Reflective Display Panel Edge Shielding for Spacer-Induced Light Leakage
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Solution Overview
Problem
In reflective display panels, spacers disrupt the alignment of the alignment layer, leading to dark state light leakage and reduced display contrast due to the height difference between the spacer and the film surface, affecting the arrangement state of the liquid crystal layer.
Innovation Solution
The implementation of light shielding patterns that overlap with the second side edge of the spacers but not the first, ensuring effective alignment coverage while minimizing reflectivity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are disposed between substrates to form cavity for liquid crystal material, then uniform thickness of liquid crystal layer is achieved, but dark state light leakage occurs due to alignment effect reduction in regions shielded by spacers
Solution Approach 1:
A light shielding pattern is introduced as an intermediary element between the spacer and the alignment layer. This light shielding pattern selectively blocks light in regions where the spacer causes alignment defects, thereby preventing dark state light leakage without affecting the overall uniform thickness of the liquid crystal layer formed by the spacer.
Solution Approach 2:
The light shielding pattern is designed with specific geometric characteristics (width, position, shape) that allow it to provide local light blocking only in the regions where the spacer causes alignment issues. The light shielding pattern has a width greater than the spacer width and is positioned to overlap with the second side edge of the spacer, providing localized correction without global impact.
2Object-affected harmful factors
If light shielding pattern is disposed to cover spacer regions, then dark state light leakage is reduced, but reflectivity of the display panel is reduced
Solution Approach 1:
The light shielding pattern is designed with specific dimensional characteristics (width, position, shape) that limit its light blocking effect to only the necessary regions. The pattern width is greater than the spacer width but carefully controlled, and it is positioned to overlap with the second side edge of the spacer, ensuring that light shielding is provided only where alignment defects occur, while minimizing impact on the overall display area and reflectivity.
Solution Approach 2:
The light shielding pattern extends beyond the spacer width in certain directions (overlapping with the second side edge) to provide sufficient coverage of the alignment defect regions, while the pattern design ensures that the excessive extension does not significantly impact the overall reflectivity of the display panel.
Data Source
AI summary
A reflective display panel includes a first substrate, a second substrate, pixel structures, spacers, a first alignment layer, a second alignment layer, a liquid crystal layer, and light shielding patterns. The pixel structures are disposed on the first substrate. The spacers and the liquid crystal layer are disposed between the first and second substrates. The first alignment layer is disposed on the first substrate and has a first alignment direction. The second alignment layer is disposed on the second substrate and has a second alignment direction. Each spacer has a first side edge and a second side edge facing away from each other and sequentially arranged along the first or second alignment direction. In a stacking direction of the first and second substrates, each light shielding pattern overlaps with the second side edge of one of the spacers, but does not overlap with the first side edge thereof.