Curved LCD Asymmetric Alignment Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-sized liquid crystal displays (LCDs) face challenges in maintaining consistent viewing angles due to curvature, leading to variations in light transmittance and display quality, particularly with misalignment between substrates during the bending process, which causes interference and collisions of liquid crystal molecule alignments.
Innovation Solution
A curved liquid crystal display design featuring a first and second curved substrate with a liquid crystal layer and alignment layers, where the second curved liquid crystal alignment layer has a higher average number of protrusions and surface roughness values than the first, stabilizing the alignment direction of liquid crystal molecules and reducing collisions, thereby enhancing light transmittance and voltage holding ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LCD is curved to compensate for viewing angle differences, then viewing angle consistency is improved, but light transmittance decreases and display quality deteriorates
Solution Approach 1:
The patent applies different surface structures to different alignment layers: the first curved liquid crystal alignment layer has a first surface structure, while the second curved liquid crystal alignment layer has a second surface structure with different properties (higher protrusion density or greater surface roughness). This local differentiation optimizes light transmittance while maintaining the curved display's viewing angle consistency.
2Ease of manufacture
If both alignment layers have the same surface structure, then manufacturing is simplified, but liquid crystal molecule alignment becomes unstable causing collisions and defects
Solution Approach 1:
The patent introduces asymmetric surface structures between the two alignment layers. The first and second surface structures differ in characteristics such as protrusion density or surface roughness, creating an asymmetric configuration that stabilizes liquid crystal alignment and prevents molecular collisions, thereby improving display reliability without excessive manufacturing complexity.
3Reliability
If the second alignment layer has higher protrusion density or surface roughness, then liquid crystal alignment stability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes specific parameters of the surface structures, including protrusion height (10-100 nm), protrusion density (10^4-10^6 per mm²), and surface roughness (1-10 nm RMS for first layer, 2-20 nm RMS for second layer). By defining precise parameter ranges, the patent achieves reliable liquid crystal alignment while maintaining manufacturability through controlled variations rather than extreme precision requirements.
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 design improves light transmittance and reduces defects like dark portions or spot defects, maintaining display quality across different viewing angles by stabilizing liquid crystal molecule alignments and enhancing the voltage holding ratio.
Implementation Method 1
a first liquid crystal molecule and aligned on a surface of the first curved liquid crystal alignment layer, a second liquid crystal molecule and aligned on a surface of the second curved liquid crystal alignment layer
Implementation Method 2
The LCD generates an electric field in the liquid crystal layer by applying voltages to the electric field generating electrodes
Implementation Method 3
the alignment of liquid crystals of the liquid crystal layer is determined based on the generated electric field, and polarization of incident light is controlled by the alignment of liquid crystals
Data Source
AI summary
A curved liquid crystal display including a first curved substrate; a second curved substrate; a liquid crystal layer including liquid crystal molecules having negative dielectric anisotropy, the liquid crystal layer being interposed between the first and second curved substrates; a first curved liquid crystal alignment layer interposed between the liquid crystal layer and the first curved substrate; and a second curved liquid crystal alignment layer interposed between the liquid crystal layer and the second curved substrate. The second curved liquid crystal alignment layer has an average value of surface roughness values greater than an average value of surface roughness values of the first curved liquid crystal alignment layer.