Reactive Mesogen Alignment for LCD Residual Image Reduction
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Solution Overview
Problem
Conventional liquid crystal displays face challenges in forming a horizontal alignment layer without a separate process and in reducing residual image occurrence without compromising the voltage holding ratio (VHR).
Innovation Solution
A liquid crystal display is manufactured with a first and second substrate facing each other, where a liquid crystal layer is disposed between them, and a reactive mesogen is used in at least one alignment layer, with a polarization exposure method involving heat treatment and polarized light exposure to achieve horizontal alignment of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate alignment layer formation process is used, then the alignment of liquid crystal molecules is improved, but the manufacturing complexity and process time increase
Solution Approach 1:
The patent merges the alignment layer formation function into the liquid crystal layer itself by incorporating reactive mesogen compounds. The liquid crystal layer performs both the liquid crystal function and the alignment layer function, eliminating the need for a separate alignment layer and its formation process, thus reducing manufacturing complexity while maintaining alignment precision
Solution Approach 2:
The liquid crystal layer is given multiple functions: it serves as both the liquid crystal medium for display and as the alignment layer for controlling molecular orientation. The reactive mesogen compounds enable the liquid crystal layer to self-align, making the system more universal and process-efficient
2Manufacturing precision
If conventional alignment layers are used, then liquid crystal alignment is achieved, but residual image occurrence increases
Solution Approach 1:
The patent changes the chemical composition parameters of the alignment layer by using reactive mesogen compounds with specific molecular structures and ratios. This chemical parameter change enables the alignment layer to provide better alignment uniformity and reduce residual image occurrence while maintaining effective liquid crystal alignment
Solution Approach 2:
The alignment layer is formed as a composite material containing reactive mesogen compounds mixed with liquid crystal materials. This composite structure provides both the alignment function and the liquid crystal display function, and the specific composition ratio is optimized to reduce residual images while maintaining alignment quality
3Reliability
If voltage holding ratio is increased to reduce residual images, then image quality improves, but the alignment layer performance requirements become more stringent
Solution Approach 1:
The patent optimizes the chemical composition parameters of the reactive mesogen compounds to achieve a balance between voltage holding ratio and alignment uniformity. By adjusting the molecular structure and concentration of reactive mesogens, the system achieves high voltage holding ratio without requiring extremely precise alignment layer uniformity, thus resolving the contradiction between reliability and manufacturing precision
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 allows for the formation of a horizontal alignment layer without additional processes and reduces residual image occurrence without affecting the VHR, enhancing image production and display quality.
Implementation Method 1
At least one of the first liquid crystal alignment layer and the second liquid crystal alignment layer includes a reactive mesogen
Implementation Method 2
The polarization exposure method includes performing an exposure to polarized light toward a second direction
Implementation Method 3
The polarization exposure method includes performing a heat treatment in a first direction toward the first substrate or the second substrate
Implementation Method 4
The liquid crystal display may generate an electric field in the liquid crystal layer. The electric field may be generated in the liquid crystal layer by applying a voltage to the field generating electrodes
Data Source
AI summary
A liquid crystal display including a first substrate and a second substrate facing each other; a liquid crystal layer disposed between the first substrate and the second substrate; a first liquid crystal alignment layer disposed between the liquid crystal layer and the first substrate; and a second liquid crystal alignment layer disposed between the liquid crystal layer and the second substrate. At least one of the first liquid crystal alignment layer and the second liquid crystal alignment layer includes a reactive mesogen.