HMD Beam Splitter Multiple Depth Imaging
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Solution Overview
Problem
Head-mounted displays cause visual fatigue, dizziness, and other discomforts due to the vergence-accommodation conflict, as they fail to provide depth information, leading to flat display images being perceived at the same visual depth despite objects being at different distances.
Innovation Solution
A head-mounted display with a beam splitting device and multiple displays projecting images to different imaging surfaces through a lens set, allowing images to be focused at varying depths, reducing the vergence-accommodation conflict by simulating natural depth perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a head mounted display shows multiple virtual objects at different positions, then the display can present depth information, but all objects appear at the same visual depth on a flat display image, causing vergence-accommodation conflict
Solution Approach 1:
The patent introduces a new dimension by creating multiple imaging surfaces at different depths in front of the user's eyes. Instead of displaying all virtual objects on a single flat display image, the system projects images onto multiple transparent display surfaces positioned at different distances from the eyes, thereby restoring depth information and resolving the vergence-accommodation conflict.
Solution Approach 2:
The patent uses transparent display surfaces as intermediaries between the light sources and the user's eyes. These transparent display surfaces are positioned at different depths and serve as imaging surfaces that allow light to pass through while presenting visual information at specific distances, enabling the eyes to focus at different depths for different virtual objects.
2Device complexity
If a head mounted display uses a single display image, then the device structure is simple, but it cannot provide depth information leading to visual fatigue and discomfort
Solution Approach 1:
The patent divides the single display image into multiple separate images displayed on different transparent display surfaces positioned at different depths. Each virtual object is displayed on its own imaging surface, allowing the eyes to focus at the appropriate depth for each object, thereby reducing visual fatigue while maintaining manageable device complexity through modular implementation.
3Device complexity
If multiple images are displayed at the same visual depth, then the display structure is simple, but it causes dizziness due to vergence-accommodation conflict
Solution Approach 1:
The patent resolves the dizziness caused by displaying multiple images at the same visual depth by introducing a depth dimension. Multiple transparent display surfaces are positioned at different distances from the user's eyes, creating multiple imaging surfaces at different depths. This allows each virtual object to be displayed at its appropriate depth, restoring the natural relationship between vergence and accommodation and eliminating dizziness.
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 reduces dizziness and discomfort by allowing multiple objects to be viewed at different depths, enhancing user comfort and reducing visual fatigue.
Implementation Method 1
The beam splitting device has a first reflective surface, a second reflective surface and a transmissive surface. The first display projects a first image to the first reflective surface. The second display projects a second image to the transmissive surface. The third display projects a third image to the second reflective surface. The first reflective surface reflects the first image to the target area, the second reflective surface reflects the third image to the target area
Implementation Method 2
The second image is projected to the target area through the transmissive surface. The lens set is disposed between the beam splitting device and a target area
Data Source
AI summary
A head mounted display and a multiple depth imaging apparatus thereof are provided. The imaging apparatus includes a beam splitting device, a first display, a second display, a third display and a lens set. The beam splitting device has a first reflective surface, a second reflective surface and a transmissive surface. The first display projects a first image to the first reflective surface. The second display projects a second image to the transmissive surface. The third display projects a third image to the second reflective surface. The lens set is disposed between the beam splitting device and a target area. The first image, second image and third image are respectively imaging on a first imaging surface, a second imaging surface and a third imaging surface, and distances between the target area and the first, second and third imaging surfaces are different.