Curved LCD Alignment Layers for Light Transmissivity
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Solution Overview
Problem
Curved liquid crystal displays face issues with light transmissivity and the occurrence of unnecessary patterns or spots due to misalignment of substrates during the bending process, which degrades display quality.
Innovation Solution
A curved liquid crystal display design featuring a first and second curved substrate with a liquid crystal layer in between, where the first substrate's alignment layer contains a light stabilizer and the second substrate's alignment layer has a higher amount of reactive mesogen, preventing polymerization and maintaining vertical alignment of liquid crystals, thus preventing interference and collision of alignment directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a curved liquid crystal display is formed by bending the liquid crystal display, then the difference in angle of vision is compensated, but light transmissivity deteriorates and unnecessary patterns or spots occur due to substrate misalignment
Solution Approach 1:
The patent applies different compositions to different alignment layers: the first curved liquid crystal alignment layer contains a light stabilizer to prevent polymerization and maintain light transmissivity, while the second curved liquid crystal alignment layer has a higher reactive mesogen content to ensure proper liquid crystal alignment. This local differentiation resolves the contradiction by addressing specific issues (light transmissivity vs. alignment quality) at different locations in the system
Solution Approach 2:
The patent uses composite alignment layers with different material compositions - one layer combining polyimide with light stabilizer and reactive mesogen, and another layer with higher reactive mesogen content. These composite materials enable simultaneous achievement of light transmissivity maintenance and proper liquid crystal alignment in the curved display structure
2Area of stationary object
If the liquid crystal display size is enlarged for television receiver use, then the screen size is increased, but the difference in angle of vision increases between central and side portions
Solution Approach 1:
The patent employs curved substrates (first and second curved substrates) that bend in a specific direction to match the viewer's field of view. This curvature compensates for the increased angle of vision difference in large-screen displays, allowing viewers to maintain consistent viewing quality across the entire screen area, thus resolving the contradiction between screen size enlargement and angle of vision uniformity
3Reliability
If a light stabilizer is added to the first curved liquid crystal alignment layer, then light transmissivity is improved, but the alignment layer composition becomes more complex
Solution Approach 1:
The light stabilizer is added only to the first curved liquid crystal alignment layer, not uniformly to both alignment layers. This localized approach improves light transmissivity where needed (in the layer exposed to backlight) while keeping the second alignment layer composition simpler and more focused on alignment function, thus resolving the contradiction between light transmissivity improvement and composition complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances light transmissivity and prevents the formation of spots or patterns, improving display quality by maintaining proper alignment of liquid crystals and reducing surface roughness.
Implementation Method 1
a first curved liquid crystal alignment layer disposed between the liquid crystal layer and the first curved substrate and containing a light stabilizer
Implementation Method 2
a second curved liquid crystal alignment layer disposed between the liquid crystal layer and the second curved substrate including a reactive mesogen
Data Source
AI summary
A curved liquid crystal display comprises, a first curved substrate; a second curved substrate facing the first curved substrate; a liquid crystal layer disposed between the first curved substrate and the second curved substrate; a first curved liquid crystal alignment layer disposed between the liquid crystal layer and the first curved substrate and containing a light stabilizer; and a second curved liquid crystal alignment layer disposed between the liquid crystal layer and the second curved substrate.