Light Field Display Device Resolving Vergence-Accommodation Conflict
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Solution Overview
Problem
Current head-mounted displays using 2D image technology often cause vergence-accommodation conflict, leading to dizziness and discomfort due to mismatched monocular and binocular focus, which is not effectively addressed by existing light field display devices.
Innovation Solution
A display device comprising a light source, light-directing element, reflective display element, microlens array, and first lens, which reduces thickness and weight while improving field of view and image sharpness by projecting lighting beams through a microlens array to form sub-image beams that converge and enhance depth perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional head-mounted display uses 2D image technology, then the device structure is simple, but it causes vergence-accommodation conflict leading to dizziness and discomfort
Solution Approach 1:
The display device is segmented into multiple functional components: light source, light-directing element, reflective display element, microlens array, and first lens. Each component performs a specific function in the light path to achieve light field display效果和减少vergence-accommodation conflict
Solution Approach 2:
The patent transitions from 2D image display to 3D light field display by adding depth dimension through microlens array and multiple imaging planes, enabling real or virtual images to be formed at different distances, thus resolving the vergence-accommodation conflict
2Object-affected harmful factors
If light field display technology is used to produce stereoscopic images, then depth feeling is achieved, but the device thickness and weight increase
Solution Approach 1:
The optical components are nested compactly: the microlens array is positioned between the first lens and the light-directing element, with the reflective display element receiving light through this nested arrangement. This nesting reduces the overall thickness while maintaining the light field display functionality
Solution Approach 2:
The light-directing element acts as an intermediary component that projects lighting beams toward the first direction, enabling compact arrangement of optical components and reducing device thickness while maintaining imaging performance
3Object-affected harmful factors
If light field display technology is used to produce stereoscopic images, then depth feeling is achieved, but the device weight increases
Solution Approach 1:
The nested arrangement of optical components (microlens array within the space between first lens and light-directing element) reduces the overall device volume and weight while maintaining light field display functionality
Solution Approach 2:
The light-directing element serves as a compact intermediary that enables efficient light path management, reducing the need for heavy structural support and minimizing device weight
4Device complexity
If conventional display elements are used, then the device structure is simple, but the field of view and image sharpness are limited
Solution Approach 1:
The patent replaces conventional mechanical display elements with an optical system comprising microlens array and reflective display element. This substitution enables higher image sharpness and wider field of view through optical manipulation rather than mechanical limitations
Solution Approach 2:
The microlens array changes the optical parameters of light beams by focusing and directing them to form sub-image beams. This parameter change enables improved image sharpness and expanded field of view while maintaining a relatively simple device structure
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 the thickness and weight of the display device, enhances the field of view, and improves image sharpness, thereby mitigating vergence-accommodation conflict and providing a more comfortable and immersive viewing experience.
Implementation Method 1
each sub-image beam pass through the light-directing element and is projected to the first lens by the corresponding microlens and transmitted to an aperture
Implementation Method 2
The reflective display element includes a plurality of micro-image units, wherein each micro-image unit converts the lighting beam into an sub-image beam and reflects the sub-image beam
Data Source
AI summary
A display device includes a light source, a light-directing element, a reflective display element, and a microlens array. The light-directing element is disposed on the transmission path of a lighting beam provided by the light source for projecting the lighting beam toward the first direction. The reflective display element includes a plurality of micro-image units, wherein each micro-image unit converts the lighting beam projected from the light-directing element into an sub-image beam and reflects the sub-image beam. The microlens array is disposed on the transmission path of the sub-image beams, wherein the light-directing element is located between the microlens array and the reflective display element. The microlens array includes a plurality of microlenses. Each sub-image beam pass throughs the light-directing element and is projected to an aperture by the corresponding microlens, and the sub-image beams pass through the aperture to form an image beam.