MEMS Fast Scanner Rotary Platform Curvilinear Scan HMD

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Solution Overview

Problem

Existing head-mounted display (HMD) projection systems waste resources by rendering high-resolution images uniformly across the entire field of view, even though human vision only requires high detail in a small central area.

Innovation Solution

A projector system using a MEMS fast scanner and a rotary platform to create a curvilinear scan pattern, with higher resolution scanning in the central area where the user is looking and lower resolution scanning in the peripheral vision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If uniform high-resolution rendering is applied across the entire field of view, then image quality is improved, but resource consumption increases

Engineering Contradiction:
Improveimage resolutionVSAvoidresource consumption
Core Design Contradiction:
Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies different rendering resolutions to different regions of the field of view. The central foveal region receives high-resolution rendering while peripheral regions receive lower resolution rendering. This is achieved by mapping scan angles to resolution levels, where the MEMS scanner spends more time or uses higher scan rates in the central region corresponding to foveal vision, thereby optimizing resource consumption while maintaining perceived image quality.

Inventive Principle:
Principle #3Local quality

2Measurement precision

If high-resolution data is rendered for the entire image, then image detail is improved, but processing efficiency deteriorates

Engineering Contradiction:
Improveimage detailVSAvoidprocessing efficiency
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The system renders high-detail image data only for the central foveal region where human vision is most acute, while using lower-detail rendering for peripheral regions. The curvilinear scan pattern generated by the MEMS fast scanner and rotary platform directs higher scan rates and resolution to the central field of view, reducing the total computational load while maintaining perceived image quality.

Inventive Principle:
Principle #3Local quality

3Area of stationary object

If rectangular raster scan pattern is used, then uniform coverage is achieved, but human visual perception optimization is lost

Engineering Contradiction:
Improvefield of view coverageVSAvoidvisual acuity matching
Core Design Contradiction:
Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent transforms the traditional rectangular raster scan pattern into a curvilinear scan pattern that follows the natural curvature of human visual perception. The MEMS fast scanner combined with a rotary platform generates scan paths that concentrate resolution and detail in the central foveal region and gradually reduce toward the periphery, matching the human eye's acuity distribution. This curvilinear mapping optimizes the use of rendering resources while maintaining comprehensive field of view coverage.

Inventive Principle:
Principle #14Spheroidality (Curvature)

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

This approach reduces resource consumption by focusing higher resolution and accuracy only where needed, improving visual quality while minimizing unnecessary rendering and resource usage.

Implementation Method 1

A microelectromechanical system (MEMS) is coupled to the microscopic mirror. The MEMS is configured to tilt the microscopic mirror at a varying scan angle in a first periodic fashion along a single scanning axis

Methodology Applied
Scientific EffectMEMS (Microelectromechanical system): Microelectromechanical Systems

Implementation Method 2

A rotary platform is coupled to the microscopic mirror. The rotary platform is configured to rotate the microscopic mirror about a rotation axis in a second periodic fashion

Methodology Applied
Scientific EffectRotational motion:

Implementation Method 3

A light emitter is configured to direct light into the mirror. The light emitter is configured to be modulated based on the position of the microscopic mirror due to the microscopic mirror being tilted along the scanning axis and rotated about the rotary axis

Methodology Applied
Scientific EffectLight reflection and modulation: Reflection

Data Source

PatentUS20250093663A1Projection device and projection method for head mounted display based on rotary MEMS fast scanner
Publication Date: 2025.03.20 MICROSOFT TECHNOLOGY LICENSING LLC
  • US20250093663A1 patent drawing
  • US20250093663A1 patent drawing
  • US20250093663A1 patent drawing

AI summary

A projector system in a head mounted display (HMD). The projector system includes a microscopic mirror. A microelectromechanical system (MEMS) is coupled to the microscopic mirror. The MEMS is configured to tilt the microscopic mirror at a varying scan angle in a first periodic fashion along a single scanning axis. A rotary platform is coupled to the microscopic mirror. The rotary platform is configured to rotate the microscopic mirror about a rotation axis in a second periodic fashion. A light emitter is configured to direct light into the mirror. The light emitter is configured to be modulated based on the position of the microscopic mirror due to the microscopic mirror being tilted along the scanning axis and rotated about the rotary axis.