Hybrid Scanning Display Risley Scanner Headset Tracking
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Solution Overview
Problem
Current Head-Mounted Displays (HMDs) face limitations in size, resolution, viewing angle, and cost, with existing technologies requiring compromises that result in user discomfort and impracticality for everyday use, and previous solutions like U.S. Pat. No. 5,764,280 suffer from severe image distortion when the user's head is not perpendicular to the light source array.
Innovation Solution
A display system with a plurality of light sources forming an array, a scanning means worn by the user for synchronization, and a tracking system to measure relative angles, utilizing a Risley scanning system and circularly polarized filters to maintain image fidelity and allow variable viewing angles, eliminating distortion and enabling immersive and flexible display form factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional HMD is designed with existing technology, then resolution and pricing can be improved, but the device becomes bulky and obtrusive
Solution Approach 1:
The patent extracts the light source array from the headset and places it externally. The headset contains only the scanning means (Risley scanner) and tracking sensors, while the light sources are positioned separately. This extraction allows the headset to be compact and lightweight while still achieving high resolution through the external light source array
Solution Approach 2:
The patent transitions from a two-dimensional light source array to a three-dimensional volumetric display space. By using a Risley scanner to direct light from the external array through multiple angular positions, the system creates a 3D image space that users can view from different angles, effectively adding a spatial dimension to the display
2Adaptability or versatility
If the user's head is not perpendicular to the light source array, then viewing flexibility is improved, but image distortion occurs
Solution Approach 1:
The patent incorporates tracking sensors in the headset that continuously monitor the user's head position and orientation relative to the light source array. This feedback information is used to dynamically adjust the scanning patterns and light modulation, compensating for head movements and maintaining accurate image formation even when the user views from non-perpendicular angles
Solution Approach 2:
The system transitions from a static display geometry to a dynamic one. The Risley scanner continuously adjusts its angular positions based on real-time tracking data, and the light source modulation changes dynamically to compensate for user movement. This dynamic adaptation allows the display to maintain image fidelity across multiple viewing angles
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
The solution provides a low-cost, high-resolution display that can be viewed from multiple angles without distortion, suitable for various applications, including immersive simulations and virtual object interaction, while maintaining visual fidelity and user comfort.
Implementation Method 1
circularly polarized filters to maintain image fidelity and allow variable viewing angles
Data Source
AI summary
A display device that significantly improves upon existing scanned display technology (Bloom et al. U.S. Pat. No. 5,764,280), and allows for entirely new display form factors. Just a few of the embodiments may provide: low cost displays that replace computer monitors and televisions, folding displays on mobile devices, entirely new forms such as pedestal/conference room displays that allow a user to walk around virtual objects, or even provide fully immersive simulation environments with visual fidelity never before possible. Furthermore, one or more embodiments eliminate the shortcomings, discovered by the present inventor, in displays of the type described by U.S. Pat. No. 5,764,280.