Storage Case Calibration for Head-Mounted Device Alignment
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Solution Overview
Problem
Electronic devices, particularly head-mounted devices, face misalignment issues due to drop events and high-stress conditions, affecting component performance.
Innovation Solution
A storage case with calibration capabilities, including optical components and sensors, automatically calibrates displays, cameras, and motion sensors by capturing images and applying corrective actions to align components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If head-mounted device is subjected to drop events and high-stress events, then device portability and durability are improved, but component alignment deteriorates
Solution Approach 1:
The storage case performs calibration actions in advance by capturing images of calibration patterns and storing reference data before the device is used. This preliminary calibration ensures that even if misalignment occurs during use, the system has baseline data to detect and correct the deviation, thus maintaining component alignment precision after durability events.
Solution Approach 2:
The system continuously monitors component alignment by capturing images during device operation and comparing them against reference calibration data. When misalignment is detected, the system provides feedback to adjust the display or optical components, thereby maintaining alignment precision despite prior stress events that affected durability.
2Manufacturing precision
If calibration features are added to storage case, then component alignment precision is improved, but device complexity increases
Solution Approach 1:
The storage case is designed to serve multiple functions: it stores the head-mounted device, charges it via wireless power transfer, and performs calibration operations. By integrating these functions into a single device, the overall system complexity is reduced compared to having separate storage, charging, and calibration systems.
Solution Approach 2:
The storage case autonomously performs calibration operations without requiring external equipment or manual intervention. The case contains its own image sensors, light sources, and processing capabilities to capture calibration patterns and compute alignment corrections, thereby reducing the complexity burden on the head-mounted device itself.
3Measurement precision
If multiple calibration features are integrated, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The calibration system operates autonomously without requiring user intervention. When the device is placed in the storage case, the calibration sequence automatically executes: light sources illuminate calibration patterns, image sensors capture the patterns, processing circuitry analyzes the images to detect misalignment, and corrections are applied. This self-service approach maintains high measurement precision while preserving ease of operation.
Solution Approach 2:
The system performs calibration actions automatically at predetermined moments, such as when the device is first placed in the storage case or after detecting a stress event. This preliminary and automatic calibration eliminates the need for users to manually initiate complex calibration procedures, thereby maintaining measurement precision without compromising ease of operation.
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
Ensures accurate alignment and performance of head-mounted device components by detecting and correcting misalignments, enhancing user experience and device reliability.
Implementation Method 1
the case may include a light source and a diffractive optical element to create a light pattern that virtually originates from infinity
Implementation Method 2
the case may include optical charts, physical fiducials, and/or reflective calibration spheres for calibrating inward-facing cameras
Data Source
AI summary
A system may include a head-mounted device and a storage case for storing and calibrating the head-mounted device. The storage case may include a recess that receives the head-mounted device. The case may include optically detectable features for calibrating cameras in the head-mounted device. For example, the case may include optical charts, physical fiducials, and/or reflective calibration spheres for calibrating inward-facing cameras on the head-mounted device such as gaze tracking image sensors. For calibrating outward-facing cameras on the head-mounted device that have larger focal distances, the case may include a light source and a diffractive optical element to create a light pattern that virtually originates from infinity. The case may include cameras for capturing images of displayed images on the head-mounted device to determine if a waveguide and display in the head-mounted device are misaligned.