Organic Layer Composition for VA LCD Domain Formation
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Solution Overview
Problem
Vertical alignment (VA) mode liquid crystal displays (LCDs) face challenges with lower side visibility compared to front visibility, and existing methods for forming domains in a single pixel to enhance viewing angle are not effective in preventing damage to the organic layer during ultraviolet hardening of the liquid crystal layer.
Innovation Solution
A pre-tilt angle of the liquid crystal layer is formed by hardening an alignment aid agent using ultraviolet rays, and an organic layer composition is developed with a binder copolymerized from acryl-based compounds and compounds without a —COO— group, including light absorption agents that absorb ultraviolet light and convert it into heat, preventing damage to the organic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ultraviolet rays are used to harden the alignment aid agent to form a pre-tilt angle and domains, then the viewing angle is improved, but the organic layer deteriorates due to damage from ultraviolet rays
Solution Approach 1:
A light absorption agent is introduced as an intermediary substance within the organic layer composition. This agent selectively absorbs ultraviolet light during the hardening process, converting it to heat energy, thereby protecting the organic layer from ultraviolet damage while still allowing the alignment aid agent to be properly hardened by the ultraviolet rays to form domains and improve viewing angle
Solution Approach 2:
The harmful ultraviolet light that would otherwise damage the organic layer is converted into beneficial heat energy through the light absorption agent. This heat generation protects the organic layer while the ultraviolet hardening process still successfully forms the necessary domains in the liquid crystal layer for improved viewing angle
2Adaptability or versatility
If a single pixel is divided into multiple domains to achieve wide viewing angle, then the viewing angle is improved, but the side visibility remains lower compared to front visibility
Solution Approach 1:
Different regions of the pixel are given different alignment characteristics through the formation of multiple domains with different alignment directions. The light absorption agent is uniformly distributed to provide localized protection throughout the organic layer, ensuring that each domain can be properly formed and maintained with optimal viewing characteristics from different angles
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 the formation of domains in a single pixel, improving viewing angles while preventing deterioration of the liquid crystal layer and organic layer during ultraviolet hardening, thereby increasing the durability and performance of VA mode LCDs.
Implementation Method 1
light absorption agents that absorb ultraviolet light and convert it into heat, preventing damage to the organic layer
Implementation Method 2
A pre-tilt angle of the liquid crystal layer is formed by hardening an alignment aid agent included in the liquid crystal layer by ultraviolet rays
Data Source
AI summary
An organic layer composition and a liquid crystal display including the same are provided. An organic layer composition according to an exemplary embodiment includes a binder formed by copolymerizing compounds included in a first group and a second group, wherein the first group includes an acryl-based compound and the second group includes a compound without a —COO— group.