Liquid Crystal Display Pretilt Alignment via Photo-Polymerizable Assistant
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving uniform pretilt alignment, leading to reduced contrast ratio and display quality due to non-uniform pretilt differences, which result in afterimages.
Innovation Solution
Incorporating an alignment assistant with a mesogen and photo-polymerizable groups in the liquid crystal layer, such as compounds represented by Chemical Formulas 1 to 4, to control pretilt alignment and reduce residual non-polymerized alignment assistant content, thereby improving display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liquid crystal composition is used, then basic display function is achieved, but non-uniform pretilt alignment occurs resulting in afterimages and reduced display quality
Solution Approach 1:
The patent introduces an alignment assistant as an intermediary substance between the liquid crystal molecules and the substrate. This alignment assistant mediates the interaction, providing uniform pretilt alignment to the liquid crystal molecules while preventing the formation of afterimages, thus resolving the contradiction between alignment uniformity and display quality
Solution Approach 2:
The patent modifies the chemical composition parameters of the liquid crystal layer by adding specific compounds (alignment assistants with mesogenic groups and photo-polymerizable groups). This changes the physical and chemical parameters of the liquid crystal system, enabling uniform pretilt alignment and eliminating afterimages while maintaining display functionality
2Manufacturing precision
If alignment assistant with photo-polymerizable groups is added, then pretilt alignment uniformity is improved, but residual non-polymerized alignment assistant remains affecting display characteristics
Solution Approach 1:
The patent utilizes photo-polymerization as a phase transition process where the alignment assistant transforms from a monomeric state to a polymeric state upon exposure to UV light. This phase transition ensures complete conversion and eliminates residual non-polymerized alignment assistant, while maintaining the uniform pretilt alignment benefit
Solution Approach 2:
The patent incorporates the alignment assistant into the liquid crystal composition before assembly, and the photo-polymerization is activated during or after the assembly process. This preliminary incorporation ensures that the alignment assistant is in place to provide uniform pretilt alignment, while the subsequent photo-polymerization eliminates any residual monomeric forms
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 ensures uniform pretilt alignment and reduces afterimages, enhancing display quality by maintaining a low residual content of non-polymerized alignment assistant, thus improving the overall performance of liquid crystal displays.
Implementation Method 1
the alignment assistant includes a mesogen and two or more photo-polymerizable groups
Data Source
AI summary
A liquid crystal display including a first substrate; a second substrate facing the first substrate; a first field generating electrode disposed on the first substrate; a second field generating electrode disposed on the second substrate; and a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer including a liquid crystal and an alignment assistant, wherein the alignment assistant includes a mesogen and two or more photo-polymerizable groups.