Optical Alignment Termination Detection for Liquid Crystal Displays
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Solution Overview
Problem
In liquid crystal display manufacturing, especially in PSVA techniques, the variation in glass substrates affects UV illumination, leading to inconsistent optical alignment, making time-based control ineffective in mass production, resulting in potential under or over alignment issues.
Innovation Solution
A method and device for detecting the termination of optical alignment by irradiating light on liquid crystal material under an electrical field, using infrared light to measure residual reactive monomer density or thickness changes, allowing for automatic control of the alignment process to ensure precise termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pure time control is used for UV irradiation during optical alignment, then the process is simple to operate, but the alignment quality becomes inconsistent due to individual substrate variations
Solution Approach 1:
The patent implements a feedback mechanism by detecting the residual monomer content during UV irradiation and using this information to dynamically adjust the irradiation process. The detection system provides real-time data on polymerization progress, allowing the system to automatically terminate irradiation when the optimal alignment state is achieved, thereby ensuring consistent alignment quality across different substrates while maintaining operational simplicity
Solution Approach 2:
The patent replaces the mechanical/time-based control system with an optical detection and control system. Instead of relying on predetermined irradiation times, the system uses optical detection methods (such as infrared spectroscopy) to monitor the chemical changes during polymerization and automatically controls the irradiation termination based on detected parameters, substituting mechanical time control with intelligent optical feedback control
2Reliability
If UV irradiation time is extended to ensure adequate alignment, then alignment completeness improves, but over-alignment occurs causing ITO slit and color film defects
Solution Approach 1:
The detection system continuously monitors the polymerization process by measuring residual monomer content, providing real-time feedback on the alignment progress. This feedback mechanism allows the system to precisely determine when optimal alignment is achieved and automatically terminate irradiation, preventing over-alignment defects such as ITO slit and color film damage while ensuring adequate alignment completion
Solution Approach 2:
The patent transforms the static, predetermined irradiation time process into a dynamic, adaptive process. The irradiation duration is no longer fixed but dynamically adjusted based on real-time detection of polymerization progress. The system can accelerate or decelerate the effective irradiation dose delivery by monitoring and responding to the actual state of the liquid crystal material, ensuring optimal alignment without excessive irradiation
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 enables precise control of the alignment process, reducing the impact of substrate variations and ensuring consistent optical alignment, thereby improving the quality and efficiency of liquid crystal display production by avoiding under or over alignment.
Implementation Method 1
under the influence of electrical field, irradiating light on the liquid crystal material so that reactive monomers in the liquid crystal material polymerizing
Implementation Method 2
based on the infrared absorption of the reactive monomers in the liquid crystal material, obtaining a density reduction in cinnamic acid in the reactive monomers
Data Source
AI summary
The present invention provides a method for termination detection of optical alignment of liquid crystal material, which includes: under influence of electrical field, irradiating light on liquid crystal material so that reactive monomers in liquid crystal material polymerizing; detecting a residual amount or a thickness change value of the reactive monomers in liquid crystal material to determine detected residual amount of reactive monomers or thickness change value in liquid crystal box reaching a default value; when reaching default value, terminating optical alignment of liquid crystal material. The present invention also provides a device for termination detection of optical alignment of liquid crystal material. Through detecting termination of optical alignment, the present invention realizes automatic control of irradiation time in optical alignment to reduce the effect of individual glass substrate variation on optical alignment to avoid affecting reaction process of alignment on reactive monomer.