Smartglasses Waveguide-Display Alignment With Pixel-Based Detection
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Solution Overview
Problem
Smartglasses often experience misalignment of waveguides and displays due to flexibility or deformation of the frame, leading to visual discomfort and reflections on the display, with no existing mechanism to detect or compensate for such misalignment.
Innovation Solution
Incorporating sub-pixels in the display pixels that act as light detectors to identify misalignment by reflecting light from the waveguide incoupler, allowing for real-time compensation through pixel shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the smartglasses frame is made flexible to improve comfort and adaptability, then ease of operation and adaptability are improved, but misalignment between waveguide and display occurs due to deformation
Solution Approach 1:
The system performs preliminary alignment calibration by emitting light from a first pixel toward the waveguide incoupler and detecting reflected light at a second pixel to determine misalignment before normal operation begins. This preliminary detection and correction sequence establishes proper alignment before the device is used, preventing misalignment issues from affecting performance.
Solution Approach 2:
The system implements continuous feedback by using display pixels to detect light reflected from the waveguide incoupler, determining misalignment based on pixel offsets, and dynamically shifting pixel positions to compensate. This closed-loop feedback mechanism continuously monitors and corrects alignment drift caused by frame flexibility during wear.
2Manufacturing precision
If misalignment detection and correction mechanisms are added to compensate for frame deformation, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The system makes the display pixels multi-functional by enabling them to both emit light for display purposes and detect reflected light from the waveguide incoupler for alignment detection. This universal use of existing pixels eliminates the need for separate detection sensors, reducing overall device complexity while maintaining alignment precision.
Solution Approach 2:
The display system performs self-alignment calibration using its own pixels for both emission and detection. The system automatically determines misalignment based on offset between emitting and detecting pixels, and self-corrects by shifting pixel positions without requiring external calibration equipment or additional control mechanisms.
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
Prevents accidental misalignment caused by frame deformation, ensuring consistent display alignment and reducing user discomfort by detecting and correcting misalignments dynamically.
Implementation Method 1
detecting, from a second pixel of the plurality of pixels, light reflected from the incoupler of the waveguide
Data Source
AI summary
Improved techniques of detecting angular misalignment between a display and a waveguide of a smartglasses device includes providing a detection mechanism for the display such that the location of a misalignment can indicate how to compensate for the misalignment.