Liquid Crystal Display Alignment Layer Thickness Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display panels face issues with non-uniform rubbing and monomer aggregation of alignment layers, leading to disclinations of liquid crystal molecules, which affect display quality.
Innovation Solution
A liquid crystal display panel design with a first substrate having regions of different thicknesses for the alignment layer, where the thickness of the alignment layer is adjusted to minimize altitude differences, and spacers are used between substrates to maintain uniformity, preventing non-uniform rubbing and monomer aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If alignment layers are uniformly coated on substrates with patterns, then the coating process is simple, but altitude differences occur on the alignment layer surface causing non-uniform rubbing and monomer aggregation
Solution Approach 1:
The patent introduces spacers at specific locations (first region) where altitude differences occur, creating local structural variations. The spacers have different heights in different regions to compensate for the altitude differences caused by patterned substrates, ensuring the alignment layer surface remains uniform locally while maintaining overall manufacturing simplicity
Solution Approach 2:
The spacers are pre-formed on the substrate before the alignment layer is coated. This preliminary action creates a compensated surface structure that prevents altitude differences during alignment layer formation, eliminating the need for complex post-coating adjustments while ensuring uniform rubbing and monomer distribution
2Manufacturing precision
If alignment layer thickness is increased to cover altitude differences, then surface uniformity is improved, but the distance between alignment layer and substrate varies excessively in different regions
Solution Approach 1:
The spacers are strategically positioned only in the first region where altitude differences occur, rather than uniformly across the entire substrate. This local compensation approach maintains uniform alignment layer thickness in critical areas without excessively increasing the overall distance between the alignment layer and substrate, preserving device performance while achieving surface uniformity
3Manufacturing precision
If spacers are added to compensate altitude differences, then alignment uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The substrate surface is divided into different regions (first region with spacers, second region without spacers) based on the specific needs of each area. This segmentation allows spacers to be added only where altitude compensation is necessary, improving alignment uniformity while minimizing the increase in overall device complexity by limiting spacer placement to specific zones
Data Source
AI summary
A liquid crystal display panel is disclosed, which includes: a first substrate with a pixel electrode region and a non-pixel electrode region; a thin film transistor unit disposed on the first substrate a first alignment layer disposed on the pixel electrode region and the non-pixel electrode region; and a plurality of color filter units disposed between the first substrate and the first alignment layer, wherein one of the color filter units includes a color filter opening to expose a part of a drain electrode of the thin film transistor unit. Herein, a region of the pixel electrode without overlapping the thin film transistor unit is defined as a non-overlapping region, the first alignment layer corresponding to the non-overlapping region has a first thickness, the first alignment layer corresponding to the color filter opening has a second thickness, and the second thickness is greater than the first thickness.