Benzotriazole UV Absorber in LC Display Alignment Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display devices face durability issues due to side reactions of polymer compounds with photoreactive functional groups, leading to decreased performance over time, especially when exposed to strong light.
Innovation Solution
Incorporating an ultraviolet absorber with a benzotriazole skeleton into the composition for forming alignment films, which suppresses side reactions by absorbing ultraviolet light and maintaining the performance of the liquid crystal display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer compound with photoreactive functional group is used in the alignment film composition, then the alignment performance and liquid crystal orientation are improved, but side reactions occur under strong light exposure leading to decreased durability
Solution Approach 1:
A polymer compound with a specific structure (Formula 1) is introduced as an intermediary substance in the alignment film composition. This polymer acts as a mediator that modifies the interaction between light and the photoreactive components, reducing harmful side reactions while preserving the desired alignment function. The polymer's specific chemical structure (with R1-R6 representing hydrogen, fluorine, chlorine, or methyl groups) enables it to function as a protective intermediary that maintains durability without sacrificing alignment performance.
Solution Approach 2:
The alignment film composition is designed as a composite material system combining multiple components: the polymer compound of Formula (1), photoreactive compounds, and other functional materials. This composite approach allows the polymer to provide structural stability and photoprotection while the photoreactive compounds maintain their orientation-inducing function. The synergistic combination resolves the contradiction by distributing different functions across multiple materials rather than relying on a single substance.
2Duration of action of stationary object
If the content of ultraviolet absorber is increased to suppress side reactions, then durability is improved, but the composition complexity and manufacturing precision requirements increase
Solution Approach 1:
The invention specifies precise parameter ranges for the polymer compound of Formula (1), including the definition of R1-R6 substituents and the overall molecular structure. By controlling these chemical parameters and the concentration of the polymer in the composition, the patent achieves effective photoprotection while maintaining manageable manufacturing precision. The parameter optimization allows durability improvement without excessive complexity in composition control.
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 use of an ultraviolet absorber with a benzotriazole skeleton in the alignment film composition enhances the durability of liquid crystal display devices by preventing photodegradation and maintaining performance even after prolonged exposure to light.
Implementation Method 1
incorporating an ultraviolet absorber into a composition for forming alignment films... an ultraviolet absorber having a benzotriazole skeleton... suppresses side reactions by absorbing ultraviolet light
Data Source
AI summary
There is provided a composition including a first polymer compound having a photoreactive functional group, a second polymer compound, and an ultraviolet absorber having a benzotriazole skeleton, wherein a content of the ultraviolet absorber is less than 20 parts by mass per 100 parts by mass of a total of the first polymer compound and the second polymer compound.