Head-Mounted Display Virtual Line for Depth Control
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Solution Overview
Problem
Existing remote control systems for movable devices like drones and vehicles face challenges in accurately controlling forward and backward movements when the desired location is beyond the measurable depth of field range of the user's eyes, as the lens distortion remains constant beyond a certain distance, limiting the system's ability to determine depth accurately.
Innovation Solution
A head-mounted display equipped with an eye tracking assembly and a display projector that projects a virtual line within the user's field of vision, allowing the system to control movement based on eye gaze and depth of field measurements, even when the desired location is outside the typical measurable range by using a virtual depth guidance element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system uses eye lens distortion to measure depth, then depth measurement is possible within focal range, but depth measurement fails beyond a certain distance where lens distortion becomes constant
Solution Approach 1:
The patent introduces a virtual depth guidance element as an intermediary between the user's eye and the distant object. This virtual element is projected at a known distance and serves as a reference point, allowing the system to indirectly measure or estimate depths beyond the direct focal range by comparing the virtual element's position with the actual object's position in the field of view.
Solution Approach 2:
The patent adds a virtual dimension by projecting depth guidance elements that create artificial depth cues. These virtual elements exist in a augmented reality layer that provides additional depth information dimension, allowing users to perceive and control depth relationships even when direct optical measurement is unavailable.
2Ease of operation
If the system relies on human eye focal range for control, then control is intuitive within normal viewing distance, but control becomes impossible for distant locations beyond eye's measurable range
Solution Approach 1:
The virtual depth guidance element acts as a mediator that bridges the gap between the user's limited eye focal range and the distant control targets. By providing visual references at known distances, it enables users to intuitively understand and control device movement to locations beyond their natural viewing range.
Solution Approach 2:
The patent replaces the biological limitation of human eye focal range with an artificial optical system (display projector) that can present visual information at any desired virtual distance. This substitution allows the control system to function reliably at distances that would otherwise be inaccessible to human vision.
3Device complexity
If no visual depth reference is provided, then the system is simpler, but the user cannot accurately judge or control depth beyond focal range
Solution Approach 1:
The virtual depth guidance element serves as a visual intermediary that provides depth reference information without requiring complex hardware modifications. By projecting simple graphical elements at calculated positions, the system achieves accurate depth perception assistance while maintaining relatively simple device architecture.
Solution Approach 2:
The patent creates virtual copies of depth reference markers that are projected into the user's field of view. These copied visual elements represent known distance references, allowing users to compare and judge the depth of actual objects or target locations without requiring direct measurement capabilities at all distances.
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
Enables precise control of movable devices in three dimensions, including forward and backward movements, by projecting a virtual line that corresponds to the range of measurable depth of field measurements, allowing users to control devices at distances beyond the usual focal range of human eyes.
Implementation Method 1
determine a depth of field measurement of the eye based on information received from an eye tracking assembly monitoring the eye
Implementation Method 2
controlling a display projector to project a virtual line within the field of vision of the user
Data Source
AI summary
Methods and systems for controlling an object using a head-mounted display. One head-mounted display includes a display projector. The head-mounted display further includes an eye tracking assembly configured to monitor an eye. The head-mounted display further includes an electronic processor coupled to the display projector and the eye tracking assembly. The electronic processor is configured to determine a depth of field measurement of the eye and determine that the depth of field measurement is greater than a predetermined distance. The electronic processor is further configured to control the display projector to project a virtual line in response to determining that the depth of field measurement is greater than the predetermined distance. The virtual line is projected such that a length of the virtual line corresponds to a range of measurable depth of field measurements of the eye.