Head-Mounted Display Alignment for Vergence-Accommodation Conflict
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Solution Overview
Problem
Vergence accommodation conflict (VAC) and VR-induced dizziness are significant issues affecting the popularity of Virtual Reality (VR) devices, as they cause discomfort and dizziness in users due to misalignment of gaze focus with virtual image planes.
Innovation Solution
A head-mounted display device with movable display assemblies and lens components adjusts positions based on gaze focus to align with the image plane position, using an eye tracker and controller to ensure the gaze focus is correctly positioned, thereby alleviating VAC and reducing dizziness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display screen and lens component positions are fixed, then the device structure is simple, but vergence accommodation conflict occurs causing user dizziness
Solution Approach 1:
The patent implements dynamic adjustment of the display screen and lens component positions based on real-time gaze focus detection. The eye tracker monitors user gaze direction and the controller adjusts the optical components accordingly, transforming the static optical system into a dynamic one that adapts to user viewing behavior, thereby resolving vergence accommodation conflict without excessive structural complexity
Solution Approach 2:
The system establishes a closed-loop feedback mechanism where the eye tracker continuously monitors gaze focus and provides real-time information to the controller. The controller then adjusts the display screen and lens component positions based on this feedback, creating a self-regulating system that maintains optimal optical alignment and prevents user dizziness
2Reliability
If the display screen and lens component positions are adjusted to align with gaze focus, then vergence accommodation conflict is alleviated, but the control system complexity increases
Solution Approach 1:
The controller serves multiple functions: it receives gaze data from the eye tracker, calculates the required adjustment amounts, controls the movement of both the display screen and lens component, and coordinates their relative positioning. This multi-functionality reduces the need for separate dedicated control modules for each function, thereby managing system complexity while achieving precise gaze focus alignment
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 effectively alleviates vergence accommodation conflict by aligning gaze focus with virtual image planes, reducing user dizziness and enhancing the VR experience.
Implementation Method 1
a lens component located on a light exiting side of the display screen
Data Source
AI summary
A head-mounted display device and a control method thereof, and a computer-readable storage medium are provided. The head-mounted display device includes a display screen and a lens component, and the control method of the head-mounted display device includes: determining gaze directions of both eyes of a user; determining a gaze focus according to the gaze directions of the both eyes; and adjusting positions of the display screen and the lens component according to the gaze focus, so that the gaze focus is located at an image plane position of a virtual image formed by the lens component from an image displayed by the display screen.