Strain Gauge Sensors for Head-Mounted Display Image Alignment
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Solution Overview
Problem
Head-mounted devices face image distortion due to deformation of their support structures under excessive forces, leading to misalignment of optical components, which existing technologies fail to adequately compensate for.
Innovation Solution
Incorporation of strain gauge sensor circuitry to monitor and measure deformations in the support structures, allowing for corrective digital image warping and other compensatory actions to maintain image alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strain gauge sensor circuitry is incorporated to monitor deformations, then image alignment is maintained under excessive forces, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-installing strain gauge sensors on the frame structure before the device is put into use. These sensors are positioned to detect potential deformations in advance, allowing the system to proactively compensate for structural changes that may occur under excessive forces, thereby maintaining image alignment stability before problems arise.
Solution Approach 2:
The patent implements feedback through a closed-loop system where strain gauge sensors continuously monitor frame deformations and transmit this data to control circuitry. The control circuitry processes the deformation information and dynamically adjusts digital image parameters in real-time, creating a feedback mechanism that automatically compensates for structural changes and maintains reliable image alignment.
2Reliability
If digital image warping is applied to compensate for deformations, then image distortion is prevented, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction algorithms for various deformation scenarios. When strain gauges detect frame deformation, the system retrieves pre-prepared correction parameters rather than performing complex real-time calculations, significantly reducing processing time while maintaining image quality compensation.
Solution Approach 2:
The patent implements partial action by applying image warping corrections only to the specific regions of the displayed image that are affected by frame deformation, rather than processing the entire image. This selective approach reduces computational burden and processing time while still effectively preventing image distortion in the critical areas.
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
Effectively prevents image distortion by compensating for structural deformations, ensuring clear and aligned images are displayed to the user even under adverse conditions.
Implementation Method 1
strain gauge sensor circuitry to monitor and measure deformations in the support structures
Implementation Method 2
Waveguides in the lenses may be used in conveying the images from the projectors to eye boxes for viewing by a user
Data Source
AI summary
A head-mounted device may have projectors that provide images. Waveguides in lenses may be used in conveying the images to eye boxes. A head-mounted frame in the head-mounted device may have lens openings that receive the lenses. The frame may include a frame member such as an elongated metal member that extends across the frame above the left and right lenses. The frame may include frame structure such as polymer structures that cover the frame member and that are configured to form the lens openings. The frame member may have a cable channel. Cabling may be used to route signals between the projectors, strain gauge circuitry, control circuitry, and other circuits in the head-mounted device. The cabling may be received within the cable channel and encapsulated in a protective polymer. Additional polymer may be molded over the protective polymer to form the frame.