Parallax Optical Element Calibration for Look-Down Angle Alignment
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Solution Overview
Problem
Autostereoscopic 3D display systems face challenges in maintaining image quality due to manufacturing errors or installation inaccuracies, leading to crosstalk and degraded image recognition, as the parallax optical element's parameters are not accurately adjusted for changes in the look-down angle (LDA) between the eyebox and the virtual image plane.
Innovation Solution
An electronic device with a processor that adjusts the parallax optical element's parameters, particularly the position offset parameter, based on changes in the look-down angle (LDA) by using a calibration pattern and building a Look-Down Angle (LDA) model to ensure accurate alignment and minimize crosstalk, allowing for user input and automatic calibration to personalize settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the parallax optical element parameters are fixed based on design values, then the device complexity is reduced, but the image quality deteriorates due to manufacturing errors and installation inaccuracies causing crosstalk
Solution Approach 1:
The patent implements dynamic parameter adjustment for the parallax optical element based on the actual look-down angle detected during operation. Instead of using fixed design values, the system continuously adapts parameters like position offset to match real-world conditions, thereby eliminating crosstalk while maintaining manageable device complexity through software-based adaptation.
Solution Approach 2:
The system changes physical parameters of the parallax optical element (specifically position offset parameters) based on detected look-down angle variations. By adjusting these parameters dynamically rather than maintaining fixed values, the system compensates for manufacturing and installation errors, improving image quality without requiring complete redesign of the optical element.
2Reliability
If manual calibration is performed for each look-down angle, then the image quality is improved, but the time consumption increases
Solution Approach 1:
The system performs preliminary calibration at multiple predetermined look-down angles during the manufacturing or setup phase. The results of these preliminary calibrations are stored in a lookup table or model, allowing the system to quickly retrieve pre-computed parameter values during operation without requiring real-time manual calibration, thus reducing time consumption while maintaining image quality.
Solution Approach 2:
Instead of performing actual manual calibration each time the look-down angle changes, the system uses a pre-built calibration model or lookup table that copies the essential calibration information. This model contains the relationship between look-down angles and optimal parameters, enabling fast parameter retrieval without repeating the time-consuming manual calibration process.
3Adaptability or versatility
If the system adapts to individual user viewing conditions, then the adaptability is improved, but the device complexity increases due to calibration requirements
Solution Approach 1:
The system enables users to perform self-calibration by displaying test patterns and receiving simple user inputs (such as confirming alignment or selecting options). The processor automatically processes this input to determine the user's look-down angle and adjust parameters accordingly. This self-service approach improves adaptability to individual users while minimizing device complexity by using straightforward interaction methods rather than complex calibration hardware.
Data Source
AI summary
An electronic device includes a display device configured to output an image, a parallax optical element configured to provide a light corresponding to the image output from the display device, to an eyebox of a user, and a processor configured to adjust a parameter of the parallax optical element based on a change of a look down angle (LDA) between the eyebox and a virtual image plane formed by the display device and the parallax optical element.