Head-Mounted Display Visual Field Calibration via Tilt Detection

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Solution Overview

Problem

The introduction of visual field testing into head-mounted display devices faces challenges due to the lack of cyclotorsion, which affects the accuracy of visual field testing, and the need for specialized structures to prevent head tilting, which complicates the use and accessibility of these devices.

Innovation Solution

The use of specialized software and hardware in head-mounted display devices to detect head tilting, generate alerts, and provide recommendations for correction, along with methods to adapt visual field testing patterns for flat surfaces, ensuring accurate testing despite the absence of cyclotorsion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If visual field testing is adapted to head-mounted display devices, then accessibility and cost-effectiveness are improved, but measurement precision deteriorates due to the absence of cyclotorsion

Engineering Contradiction:

Improveaccessibility of visual field testingVSAvoidaccuracy of visual field testing

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by detecting head tilt parameters through sensors and dynamically adjusting the display of visual field testing patterns to compensate for the absence of cyclotorsion. The system modifies display orientation and stimulus positioning based on measured head position parameters, thereby maintaining measurement accuracy in the head-mounted display environment.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If specialized structures such as chin rests are used to prevent head tilting, then measurement precision is improved, but device complexity and ease of operation worsen

Engineering Contradiction:

Improveaccuracy of visual field testingVSAvoidstructural complexity of head-mounted display

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical head-positioning structures (such as chin rests) with an electronic sensing and software compensation system. Tilt sensors detect head orientation, and the system digitally adjusts the visual field testing patterns to account for head tilt, eliminating the need for complex mechanical constraints while maintaining measurement precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If head tilting is detected and correction recommendations are provided, then measurement precision is improved, but ease of operation deteriorates

Engineering Contradiction:

Improveaccuracy of visual field testingVSAvoiduser convenience during testing

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent implements feedback by detecting head tilt through sensors and providing real-time correction recommendations to the user. The system monitors head position during testing and guides the user to adjust their posture to optimize measurement accuracy, creating a closed-loop control system that balances precision with user convenience.

Inventive Principle:

Principle #23Feedback

4Adaptability or versatility

If visual field testing patterns are adapted for flat surfaces in head-mounted displays, then adaptability is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvecompatibility with flat display surfacesVSAvoidaccuracy of stimulus positioning

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by transforming the coordinate system and positioning parameters of visual field testing patterns to accommodate flat display surfaces. The system calculates adjusted stimulus positions based on the flat geometry of head-mounted display screens, enabling accurate visual field mapping without requiring curved surfaces while maintaining precise stimulus placement.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12329453B2Device calibration via a projective transform matrix

Publication Date: 2025.06.17 UNIV OF MIAMI

AI summary

A method is disclosed for improving accuracy of visual field testing in head-mounted displays. The method includes retrieving a visual field testing pattern for a head-mounted display, the visual field testing pattern including stimuli displayed at respective locations in a visual field of the head-mounted display. The visual field testing pattern is generated on the head-mounted display. Data is retrieved from a tilt sensor, located at the head-mounted display, for detecting degrees of head tilt of a user wearing the head-mounted display and the degree of head tilt is determined. A comparison is made between the degree of head tilt of the user to a first threshold degree. In response to the degree of head tilt of the user meeting or exceeding the first threshold degree, a recommendation to the user is generated for display on the head-mounted display.