Head-Mounted Device Strain Gauge Alignment Compensation
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Solution Overview
Problem
Head-mounted devices face misalignment issues due to deformation from mounting, drops, thermal fluctuations, and aging, affecting stereo image quality and user comfort.
Innovation Solution
Incorporating strain gauge sensor circuitry to measure pointing vector misalignment and using control circuitry to adjust image data and display settings in real-time, ensuring proper alignment of left and right images despite structural deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If heavy or bulky support structures are used to prevent deformation, then structural stability is improved, but device weight and size increase
Solution Approach 1:
The patent employs strain gauge sensors to continuously monitor deformation of the support structures and feeds this information back to control circuitry. The control circuitry processes the deformation data and dynamically adjusts the display parameters (such as image position, orientation, and focus) to compensate for the measured structural changes, thereby maintaining proper optical alignment without requiring heavier structures
Solution Approach 2:
The patent replaces the mechanical approach of using heavy rigid structures to prevent deformation with a sensor-based measurement and software-based compensation system. Instead of mechanically constraining the structure to remain rigid, the system uses strain gauges to detect deformation and digitally adjusts the display output to account for the deformation, substituting mechanical rigidity with electronic adaptation
2Measurement precision
If strain gauge sensor circuitry and control circuitry are added to compensate for misalignment, then image alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The control circuitry performs multiple functions: it processes strain gauge signals, calculates deformation characteristics, determines required compensation parameters, and adjusts display settings accordingly. By consolidating these multiple functions into a single control unit, the patent reduces overall device complexity compared to having separate dedicated components for each function
Solution Approach 2:
The system automatically monitors its own structural deformation through the strain gauges and self-corrects the display alignment without requiring external intervention or complex manual adjustment mechanisms. The control circuitry autonomously processes sensor data and applies compensations, making the system self-regulating and reducing the need for additional control components
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
Maintains satisfactory stereo image quality and user comfort by compensating for misalignments caused by structural deformations without the need for overly heavy or bulky support structures.
Implementation Method 1
Sensor circuitry such as strain gauge circuitry may measure pointing vector misalignment
Data Source
AI summary
A head-mounted device may have head-mounted support structures configured to be worn on a head of a user. The head-mounted device may have stereo optical components such as left and right cameras or left and right display systems. The optical components may have respective left and right pointing vectors. Deformation of the support structures may cause the camera pointing vectors and/or the display system pointing vectors to become misaligned. Sensor circuitry such as strain gauge circuitry may measure pointing vector misalignment. Control circuitry may control the cameras and/or the display systems to compensate for measured changes in pointing vector misalignment.