Multiview Backlight Alignment Using Displayed Error Patterns
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Solution Overview
Problem
Existing methods for aligning components of multiview displays require high precision and are limited by the field of view of microscopes, unable to detect certain misalignments, and lack automation.
Innovation Solution
A method and system for aligning a multiview backlight with a light valve array using an alignment pattern displayed on the light valve array, which allows for precise adjustment to minimize error measures without optical alignment marks, and can be automated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual alignment methods are used for multiview displays, then device complexity is reduced, but manufacturing precision deteriorates due to inaccurate alignment of light sources with lens arrays
Solution Approach 1:
The patent replaces manual mechanical alignment with an automated optical alignment system that uses cameras to capture images of light sources and processes these images computationally to determine precise positions, eliminating the need for manual mechanical adjustment while achieving sub-pixel alignment accuracy
Solution Approach 2:
The patent creates digital copies (images) of the physical light sources using cameras, then performs alignment operations on these digital representations rather than directly manipulating physical components, enabling precise measurement and adjustment through image processing algorithms
2Manufacturing precision
If automated alignment systems with cameras are used, then manufacturing precision improves, but device complexity and cost increase
Solution Approach 1:
The alignment system performs self-calibration by capturing images of known reference features (such as the lens array structure itself) and automatically computing correction factors, eliminating the need for external calibration equipment or manual intervention while maintaining high precision
Solution Approach 2:
The patent designs the alignment system to perform multiple functions: capturing light source positions, detecting lens array features, computing alignment corrections, and guiding adjustment operations, all within a single integrated system that can adapt to different display configurations
3Manufacturing precision
If precise alignment is achieved through multiple measurement points, then manufacturing precision improves, but measurement time and productivity decrease
Solution Approach 1:
The patent performs preliminary capture of images from multiple positions and angles before final alignment computation, allowing the system to pre-process and store measurement data that will be used for calculating precise alignment corrections, thereby streamlining the overall alignment process
Solution Approach 2:
The alignment system uses periodic scanning or sampling of light source positions at multiple discrete points, then interpolates between these periodic measurements to determine continuous alignment parameters, balancing measurement comprehensiveness with processing efficiency
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
Enables precise and automated alignment of multiview display components, eliminating the need for optical alignment marks and improving alignment accuracy.
Implementation Method 1
a camera is used to capture an image of the light source
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3A
AI summary
A method of aligning a multiview backlight with a light valve array of a multiview display employs an alignment pattern that includes unit cells spaced apart from one another and having view blocks corresponding to different views of the multiview display. The method of aligning includes establishing the alignment pattern on the light valve array, illuminating the light valve array using the multiview backlight to display the alignment pattern, and adjusting a relative position of the multiview backlight and the light valve array to minimize an error measure of the unit cells within the displayed alignment pattern. A multiview display backlight alignment system includes the multiview display and a positioning stage configured to adjust the relative position to minimize the error measure. An automated multiview display backlight alignment system further includes a feedback controller, the positioning stage being motorized.