Blinkless MEMS Display Calibration for Bi-Phase Offset Correction
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Solution Overview
Problem
Conventional MEMS-based display calibration techniques in mixed-reality systems require blanking out regions for fiducial patterns, causing user discomfort and reducing the field of view, and often result in visual fatigue due to periodic blinking and inefficient image processing.
Innovation Solution
A blinkless and markerless bi-phase display calibration method that uses a lookup table to separate images into forward and backward sweeping images, allowing real-time calibration without blanking the screen, by correlating MEMS projection positions with camera-captured pixel positions and performing vertical and horizontal alignments to correct bi-phase offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional MEMS-based display calibration techniques use blanking out regions for fiducial patterns, then calibration accuracy can be achieved, but user comfort deteriorates and field of view is reduced
Solution Approach 1:
The patent extracts and removes the fiducial pattern blanking requirement from the calibration process. Instead of blanking out regions to display fiducial patterns, the system uses the existing display content itself for calibration by capturing images with a camera and processing them to extract calibration information, thereby eliminating the need for screen blanking and improving user comfort while maintaining calibration accuracy
Solution Approach 2:
The patent uses a camera to capture a copy of the display content for calibration purposes. By capturing an image of the displayed content and processing this copy, the system can perform calibration without requiring the display to be blanked out, thus preserving the full field of view and user comfort while achieving accurate calibration through image processing
2Measurement precision
If periodic calibration events are implemented, then calibration accuracy can be maintained, but power consumption increases and user experience deteriorates due to visual fatigue
Solution Approach 1:
The patent enables continuous calibration by processing display content in real-time without requiring periodic blanking events. The system continuously captures and processes images to maintain calibration accuracy, eliminating the need for interruptive periodic calibration events and reducing power consumption associated with repeated blanking and recalibration cycles
Solution Approach 2:
The system performs self-calibration by using its own display content as the calibration target. The camera captures the displayed content, and the processing system extracts calibration information from this content automatically, enabling the system to maintain its own calibration without external intervention or periodic manual calibration events, thereby reducing power consumption and improving user experience
3Ease of manufacture
If screen blanking is performed for calibration, then calibration can be executed, but field of view is reduced and user experience is degraded
Solution Approach 1:
The patent extracts calibration information from the existing display content itself rather than requiring blanked out regions. By processing the normally displayed content through camera capture and image processing, the system achieves calibration execution without removing or blanking any display regions, thus preserving the full field of view and user experience
Data Source
AI summary
Techniques for separating an image into a forward sweeping image and a backward sweeping image are disclosed. A lookup table maps MEMS projection positions on a display with corresponding pixel positions in an image generated by a camera facing the display. The lookup table is used to associate a first set of pixel positions in the image with a forward scanning sweep of the MEMS system. The lookup table is also used to associate a second set of pixel positions in the image with a backward scanning sweep of the MEMS system. The first and second sets of pixel positions are used to generate the forward sweeping image and the backward sweeping image, respectively. These images can then be used to calibrate the MEMS system to compensate for bi-phase.