Vision System Alignment for Patterned Retarder in 3D Displays
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Solution Overview
Problem
In polarization glass-type 3D displays, patterned retarders with protection films make it difficult to clearly identify patterns and boundaries due to similar gray tones in images captured by vision systems, hindering accurate alignment of display panels and patterned retarders.
Innovation Solution
A vision system comprising a camera, a ½ wavelength plate, and a rotatable ¼ wavelength plate with a motor, which enhances pattern recognition by adjusting the optical axes and contrast ratios of the patterns, allowing for precise alignment of patterned retarders and display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vision system captures patterns of a patterned retarder through a protection film, then the image is obtained, but the patterns and boundaries appear with similar gray tones making them difficult to clearly identify
Solution Approach 1:
A 1/4 wavelength plate is introduced as an intermediary optical element between the camera and the patterned retarder. This wavelength plate modifies the polarization state of light passing through the protection film and patterns, enabling the vision system to differentiate between patterns with different optical axes that otherwise appear with similar gray tones. The intermediary transforms the optical properties to make pattern boundaries clearly identifiable.
Solution Approach 2:
The system changes the optical parameters by rotating the 1/4 wavelength plate to different angular positions. By adjusting the orientation of the wavelength plate, the system optimizes the contrast between different patterns, transforming the gray tone similarities into distinguishable visual differences that improve measurement precision.
2Reliability
If a patterned retarder with protection film is used in a polarization glass-type 3D display, then the display structure is formed, but the patterns and boundaries become difficult to identify due to similar gray tones
Solution Approach 1:
The 1/4 wavelength plate serves as an intermediary that transforms the optical characteristics of light passing through the patterned retarder. This intermediary device enables the vision system to detect pattern boundaries clearly by modifying how different optical axes interact with the protection film, thereby improving alignment accuracy without changing the display structure itself.
Solution Approach 2:
The system induces optical contrast changes by rotating the 1/4 wavelength plate, which alters the apparent gray tones of different patterns. This optical transformation converts the previously indistinguishable similar gray tones into differentiated visual contrasts, making pattern boundary detection feasible and improving overall alignment reliability.
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 system improves the recognition accuracy of patterns and boundaries, enabling precise alignment and enhancing the overall performance of stereoscopic image displays by optimizing the contrast ratios and alignment of patterned retarders and display panels.
Implementation Method 1
a 1/4 wavelength plate arranged in front of the 1/2 wavelength plate
Implementation Method 2
a camera, a 1/2 wavelength plate arranged in front of a lens of the camera
Data Source
AI summary
A vision system for obtaining an image of a patterned retarder comprising first and second patterns having different optical axes is provided. The vision system comprises a camera, a ½ wavelength plate arranged in front of a lens of the camera, a rotatable ¼ wavelength plate arranged in front of the ½ wavelength plate.