Polarized Pulse UV Optical Alignment for Retarder Manufacturing
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Solution Overview
Problem
The existing optical alignment methods for liquid crystal display devices, such as the contact rubbing method, face challenges with productivity and reliability due to low alignment stability and anchoring energy, especially when exposed to external factors like heat, light, and physical impacts, which limits their industrial application.
Innovation Solution
An optical alignment method using polarized pulse UV, which involves preparing a substrate, forming a photoreactive layer, and irradiating it with polarized pulse UV to create an optical alignment layer with alternating domains, reducing processing time and improving alignment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact rubbing method is used for optical alignment, then liquid crystal alignment can be achieved, but alignment stability and anchoring energy are low when exposed to external factors like heat, light, and physical impacts
Solution Approach 1:
The patent replaces the mechanical contact rubbing method with a photochemical alignment method using polarized pulse UV irradiation. The photoreactive layer undergoes photochemical reaction when exposed to polarized pulse UV, creating optical anisotropy that provides stable alignment without mechanical contact, thereby eliminating sensitivity to external factors like heat, light, and physical impacts.
Solution Approach 2:
The patent changes the physical and chemical parameters of the alignment process by using polarized pulse UV with specific energy ranges (0.1-500 J/pulse) and frequencies (1-60 Hz) to induce photochemical reactions in the photoreactive layer, transforming the alignment mechanism from mechanical to photochemical with enhanced stability.
2Productivity
If conventional optical alignment methods are used, then alignment can be formed, but processing time and energy consumption are high
Solution Approach 1:
The patent employs periodic pulse UV irradiation instead of continuous irradiation. The pulsed action with frequencies of 1-60 Hz allows the photoreactive layer to undergo photochemical reactions in discrete intervals, significantly reducing the total processing time and energy consumption while maintaining effective alignment.
Solution Approach 2:
The patent uses high-energy pulse UV irradiation to rapidly induce photochemical reactions in the photoreactive layer, rushing through the alignment process in seconds rather than minutes or hours. This approach skips the lengthy gradual alignment process of conventional methods and achieves alignment quickly with reduced time and energy loss.
3Loss of time
If polarized pulse UV is used for optical alignment, then processing time and energy consumption are reduced, but the process complexity increases
Solution Approach 1:
The patent uses a photoreactive layer that can be applied to various liquid crystal display modes (TN, VA, IPS, FFS, FIS) and provides universal optical alignment functionality. The same polarized pulse UV irradiation process works across different display technologies, simplifying the overall process despite the advanced irradiation method.
Solution Approach 2:
The patent introduces a photoreactive layer as an intermediary material between the substrate and liquid crystal. This layer mediates the alignment process by undergoing photochemical reactions when exposed to polarized pulse UV, creating the necessary optical anisotropy without requiring complex direct alignment mechanisms.
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 method significantly reduces processing time and energy consumption, enhances alignment stability, and improves productivity by using polarized pulse UV to form an optical alignment layer with alternating domains, enabling more efficient and reliable liquid crystal alignment.
Implementation Method 1
forming an optical alignment layer by irradiating the photoreactive layer with polarized pulse UV
Implementation Method 2
irradiating it with polarized pulse UV to create an optical alignment layer with alternating domains
Data Source
AI summary
The present invention relates to a method for manufacturing a patterned retarder including an optical alignment layer or a first domain optically aligned in a first direction and a second domain optically aligned in a second direction. According to the invention, it is possible to improve productivity and to maximize optical alignment efficiency by reducing an optical alignment processing time using polarized pulse UV.