Birefringent Lens Grating Refractive Index Matching Detection
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Solution Overview
Problem
The manufacturing process of birefringent lens gratings faces challenges in determining the refractive index matching between the liquid crystal material layer and the lens array substrate, which is crucial for optimal light transmission and deflection, affecting the performance of 2D/3D switching stereoscopic displays.
Innovation Solution
A manufacturing and detecting device/method that includes a projection pattern, illuminating light source, image capturing device, and controller to compare the projection pattern image with a reference, regulating the curing temperature of the liquid crystal material layer to ensure refractive index matching between the liquid crystal material layer and the lens array substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the refractive index of the liquid crystal material layer is adjusted to match the lens array substrate, then light transmission accuracy is improved, but the manufacturing complexity increases due to the need for precise refractive index matching determination
Solution Approach 1:
A projection pattern is introduced as an intermediary object to indirectly measure the refractive index matching. Instead of directly measuring refractive indices, the system projects a known pattern through the liquid crystal layer and lens substrate, and analyzes the distorted projection image to determine the matching degree. This intermediary approach simplifies the measurement process while maintaining high precision.
Solution Approach 2:
The patent replaces complex direct refractive index measurement mechanisms with an optical projection and image analysis system. By using light projection and digital image processing, the system substitutes mechanical or direct optical measurement methods, reducing device complexity while achieving accurate refractive index matching determination.
2Manufacturing precision
If the curing temperature of the liquid crystal material layer is regulated during manufacturing, then the refractive index matching is improved, but the manufacturing process time increases
Solution Approach 1:
The system implements a feedback control mechanism where the projection pattern image is captured and compared with a reference image to determine the current refractive index matching status. Based on this feedback, the curing temperature is dynamically adjusted to achieve optimal matching. This closed-loop feedback system ensures precise control while minimizing unnecessary processing time by making adjustments only when needed.
Solution Approach 2:
The curing temperature is made dynamic rather than static, allowing real-time adjustments during the manufacturing process. The temperature regulator can increase or decrease temperature based on the real-time refractive index matching status, enabling the system to reach optimal matching faster than fixed-temperature processes while maintaining precision.
3Measurement precision
If a projection pattern and image capturing device are added to detect refractive index matching, then measurement accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
Instead of using complex direct refractive index sensors, the system creates an optical copy or projection of a known pattern through the material layers. By capturing and analyzing this projected image copy, the system indirectly measures refractive index matching with high accuracy. This copying approach uses simple optical components rather than complex measurement instrumentation.
Solution Approach 2:
The projection pattern and image capturing device serve multiple functions: they project alignment marks for positioning, provide the measurement pattern for refractive index analysis, and enable documentation of the manufacturing process. This multi-functionality reduces the need for separate specialized devices, thereby limiting the increase in overall device complexity.
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 precise determination and regulation of refractive index matching, ensuring proper light transmission and deflection, thereby enhancing the performance and accuracy of birefringent lens gratings in stereoscopic displays.
Implementation Method 1
a curing radiation source for curing the liquid crystal material layer
Implementation Method 2
light having a first linear polarization direction may pass through an interface of the liquid crystal material layer and the lens array substrate without any deflection, and light having a second linear polarization direction different from the first linear polarization direction may undergo deflection when it passes through the interface
Implementation Method 3
The liquid crystal material layer is one kind of birefringent material. In particular, the liquid crystal material layer has a refractive index no to ordinary light and has a refractive index ne to extraordinary light
Data Source
AI summary
The present disclosure provides a detecting device of a birefringent lens grating. The detecting device includes a projection pattern disposed adjacent to the birefringent lens grating; an illuminating light source for projecting light onto the projection pattern and the birefringent lens grating; an image capturing device for capturing the light out from the birefringent lens grating and obtaining a projection pattern image of the projection pattern; and a controller for comparing the projection pattern image with a reference to determine a refractive index matching degree of the birefringent lens grating. The present disclosure further provides a detecting method, a manufacture method and a manufacture device of the birefringent lens grating.