Curved Display Dual Pretilt Alignment Layers
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Solution Overview
Problem
Conventional curved display devices face challenges in achieving improved display quality due to limitations in aligning liquid crystal molecules, leading to texture defects when the display is curved, which affect the three-dimensional effect and user immersion.
Innovation Solution
The implementation of a curved display device with a first and second alignment layer, where the first alignment layer includes polymerized reactive mesogens with a specific pretilt-angle and the second alignment layer has a different pretilt-angle, allowing for distinct alignment of liquid crystal molecules between the substrates, and the application of electric fields to form these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single alignment layer is used in curved display devices, then the structure is simple, but texture defects occur due to improper liquid crystal molecule alignment
Solution Approach 1:
The single alignment layer is divided into two separate alignment layers (first alignment layer and second alignment layer) with different pretilt angles. This segmentation allows each layer to independently control liquid crystal molecule alignment in specific directions, resolving the texture defects that occur with a single alignment layer while maintaining manageable structural complexity.
Solution Approach 2:
The first and second alignment layers are assigned different local qualities in terms of pretilt angles. The first alignment layer has a first pretilt angle and the second alignment layer has a second pretilt angle, creating localized alignment characteristics that work together to eliminate texture defects in curved display regions.
2Reliability
If multiple alignment layers with different pretilt-angles are used, then display quality improves, but the manufacturing process becomes more complex
Solution Approach 1:
The first alignment layer is formed on the first substrate before the liquid crystal composition is introduced. This preliminary action establishes the initial alignment framework, allowing subsequent steps to build upon this foundation and simplifying the overall manufacturing process despite the presence of multiple alignment layers.
Solution Approach 2:
The liquid crystal composition containing reactive mesogens acts as an intermediary medium between the first and second alignment layers. The reactive mesogens align with both alignment layers and form a bridge that transfers alignment information, facilitating the integration of multiple alignment layers with different pretilt angles into a cohesive structure.
3Measurement precision
If reactive mesogens with functional groups are used in the alignment layer, then liquid crystal molecule alignment precision improves, but material selection becomes more restricted
Solution Approach 1:
The reactive mesogens are modified by introducing functional groups with charges (positive or negative). This parameter change in the molecular structure enables precise interaction with the alignment layers and liquid crystal molecules, achieving high alignment precision. The charged functional groups provide specific interaction mechanisms that enhance alignment control.
Solution Approach 2:
The alignment layer material is constructed as a composite system combining reactive mesogens with charged functional groups. This composite approach integrates the alignment properties of reactive mesogens with the electrostatic interaction capabilities of charged functional groups, achieving both high alignment precision and controlled material properties.
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
This approach enhances display quality by reducing texture defects and improving the three-dimensional effect, providing better user immersion and presence when viewing curved images.
Implementation Method 1
The first alignment layer includes reactive mesogens that are polymerized with each other and is disposed between the first substrate and the liquid crystal layer
Implementation Method 2
providing light and electric fields to the liquid crystal composition to form a first alignment formation layer on the first substrate
Implementation Method 3
The reactive mesogens have a functional group having charges
Data Source
AI summary
A curved display device includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer disposed between the first and second substrates, the liquid crystal layer including liquid crystal molecules, a first alignment layer including reactive mesogens which are polymerized with each other, the first alignment layer being disposed between the first substrate and the liquid crystal layer, and a second alignment layer disposed between the liquid crystal layer and the second substrate, where the reactive mesogens have a functional group having charges.