Liquid Crystal Display Alignment Layer Hardness via Composite Materials
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Solution Overview
Problem
Liquid crystal display panels face issues with the weak hardness of alignment layers formed by photoalignment processes, leading to increased susceptibility to dust attachment and scratches, and the occurrence of afterimages due to the low hardness of the alignment layer.
Innovation Solution
A liquid crystal display panel is designed with alignment layers comprising specific compounds, where the equivalent of the first structural unit is greater than the second structural unit, enhancing the hardness and optical anisotropy, and the manufacturing method involves coating and baking these compounds on substrates with ultraviolet light exposure to form the alignment layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photoalignment process is used to form an alignment layer, then transmissivity is increased and faults are decreased, but the hardness of the alignment layer becomes weak leading to dust attachment and scratches
Solution Approach 1:
The patent uses a composite alignment layer comprising a polyimide compound and a silane compound. The polyimide provides alignment functionality while the silane compound enhances hardness through crosslinking reactions. This composite structure resolves the contradiction by combining materials with complementary properties - the polyimide ensures low faults and good transmissivity, while the silane adds mechanical strength and resistance to dust and scratches.
Solution Approach 2:
The patent changes the chemical composition parameters of the alignment layer by incorporating specific ratios of polyimide and silane compounds. By adjusting the equivalent ratios and molecular weights of these compounds, the alignment layer achieves both high transmissivity (optical parameter) and increased hardness (mechanical parameter), simultaneously resolving the contradiction between reliability and strength.
2Illumination intensity
If a photoalignment process is used to form an alignment layer, then transmissivity is increased, but the alignment layer causes afterimages on the display panel
Solution Approach 1:
The composite structure of polyimide and silane compounds addresses the afterimage issue. The silane compound forms a crosslinked network that stabilizes the alignment layer structure, preventing the molecular reorientation that causes afterimages. Meanwhile, the polyimide component maintains high transmissivity. This material combination resolves the contradiction between illumination quality and image stability.
Solution Approach 2:
The patent applies different functional properties to different components of the alignment layer. The polyimide provides optical quality (high transmissivity) while the silane provides structural stability (afterimage resistance). This local differentiation of material functions allows simultaneous achievement of high transmissivity and afterimage reduction.
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 significantly increases the hardness of the alignment layer and reduces afterimages, improving the durability and display quality of the liquid crystal display panel.
Implementation Method 1
the first compound and the second compound may absorb light having a wavelength within a range of about 100 nm to about 300 nm
Data Source
AI summary
A liquid crystal display panel includes a first substrate, a second substrate, a first alignment layer, a second alignment layer and a liquid crystal layer. The second substrate faces the first substrate. The liquid crystal layer is disposed between the first alignment layer and the second alignment layer. The first alignment layer and the second alignment layer each include a polyimide compound polymerized by cyclobutane-1,2,3,4-tetracarboxylic dianhydride and cyclobutane-1,2,3,4-tetracarboxylic dianhydride derivative.