Alignment Layer Reactive Mesogen for LCD Viewing Angle
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Solution Overview
Problem
Vertically aligned liquid crystal displays suffer from poor lateral surface visibility compared to front surface visibility, and there is a need to improve the mechanical properties and afterimage performance of the alignment layer to enhance viewing angles and response speed.
Innovation Solution
Incorporating a reactive mesogen with multiple photoreactive groups and an additive into the alignment layer, which includes a main chain and side chains with vertical alignment groups, to increase cross-linking and improve mechanical properties, and using a diamine and dianhydride compound with a 1:1 mole ratio, along with specific chemical formulas for the alignment layer compounds, to form a pretilt in liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of domains are formed in one pixel by forming cutouts or protrusions on the field generating electrode, then the viewing angle is widened, but the lateral surface visibility deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the alignment layer by incorporating reactive mesogen compounds with specific molecular structures (containing photoreactive groups and vertical alignment groups) and controlling the ratio of components. This chemical parameter change enables the alignment layer to form a pretilt angle that improves lateral surface visibility while maintaining the multi-domain structure for wide viewing angle
Solution Approach 2:
The patent uses a composite alignment layer material system consisting of multiple components: reactive mesogen compounds (with photoreactive groups), vertical alignment groups, and other liquid crystal materials. This composite material approach allows the alignment layer to simultaneously achieve wide viewing angle (through multi-domain formation) and improved lateral surface visibility (through pretilt angle control enabled by the reactive mesogen's molecular structure)
2Ease of manufacture
If the alignment layer is formed with conventional materials, then the manufacturing process is simple, but the mechanical properties and afterimage performance deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the alignment layer by incorporating reactive mesogen compounds with specific molecular structures (containing photoreactive groups and vertical alignment groups) and controlling the ratio of components. This chemical parameter change enables the alignment layer to form a pretilt angle that improves lateral surface visibility while maintaining the multi-domain structure for wide viewing angle
Solution Approach 2:
The patent uses a composite alignment layer material system consisting of multiple components: reactive mesogen compounds (with photoreactive groups), vertical alignment groups, and other liquid crystal materials. This composite material approach allows the alignment layer to simultaneously achieve wide viewing angle (through multi-domain formation) and improved lateral surface visibility (through pretilt angle control enabled by the reactive mesogen's molecular structure)
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 enhanced alignment layer improves mechanical properties, reduces afterimages, and increases lateral surface visibility by forming a stable pretilt in liquid crystal molecules, thereby improving the overall performance of the liquid crystal display.
Implementation Method 1
a reactive mesogen ('RM') including two or more photoreactive groups
Implementation Method 2
the liquid crystals are aligned in a direction that is vertical to a fringe field by the fringe field formed between an edge of the cutout or the protrusion and the field generating electrode facing the edge
Data Source
AI summary
A liquid crystal display includes: a first insulating substrate, a second insulating substrate, a pixel electrode positioned on the first insulating substrate, a common electrode positioned on the first insulating substrate or the second insulating substrate, a first alignment layer positioned on the first insulating substrate, a second alignment layer positioned on the second insulating substrate, and a liquid crystal layer positioned between the first insulating substrate and the second insulating substrate. The first alignment layer and/or the second alignment layer include an additive and an alignment layer compound having a main chain, and a plurality of side chains connected to the main chain, and at least one of the plurality of side chains includes a vertical alignment group, and a reactive mesogen including two or more photoreactive groups.