Adjustable Depth of Field Lens Structure for VR Displays
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Solution Overview
Problem
Existing virtual reality display devices cause dizziness due to a lack of depth information in the displayed images, leading to convergence conflicts between the user's eye focus and the perceived depth of the stereo image.
Innovation Solution
An adjustment structure for depth of field is introduced, comprising a lens layer with adjustable focal length units, each containing charged particles and a transparent insulating liquid, which adjusts the focal length of light rays to provide depth information, matching the user's eye focus with the image depth, thereby enhancing the three-dimensional display effect and preventing dizziness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional stereo display methods are used to display images at left and right eye angles, then a stereo visual sense is produced in the brain, but the user experiences dizziness due to convergence conflicts between eye focus and perceived depth
Solution Approach 1:
The display system is segmented into multiple pixel regions corresponding to different depth zones. Each pixel region has an independently controllable lens unit that can adjust its focal length separately, allowing different parts of the display to present different depth information tailored to specific viewing zones.
Solution Approach 2:
The lens units incorporate deformable lenses with adjustable focal lengths that can dynamically change in real-time. This dynamic adjustment capability allows the system to adapt the depth of field for each pixel region according to the displayed content, enabling the focus plane to move independently from the image plane and resolve convergence conflicts.
2Adaptability or versatility
If a fixed focal length lens is used in the lens layer, then the structure is simple, but real-time adjustment of depth of field in each pixel region is not possible
Solution Approach 1:
The lens units utilize deformable lens technology where the focal length parameter can be changed by applying different voltages to the electrodes. This allows the optical properties of the lens to be dynamically adjusted without mechanical movement, enabling real-time depth of field adaptation while maintaining a relatively compact 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 allows for real-time adjustment of depth of field in each pixel region, enhancing the three-dimensional display effect, improving user immersion, and preventing dizziness during extended use by ensuring the focus adjustment of the human eyes matches the image depth, thus providing a more realistic and comfortable user experience.
Implementation Method 1
The lens includes charged particles and a first transparent insulating liquid encapsulated by a transparent flexible film
Implementation Method 2
each of the plurality of lens units includes two electrodes and a lens located between the two electrodes with an adjustable focal length
Implementation Method 3
the lens includes charged particles and a first transparent insulating liquid encapsulated by a transparent flexible film
Data Source
AI summary
An adjustment structure for depth of field, a display device, and a control method thereof. The adjustment structure for depth of field includes: a first substrate, a second substrate and a lens layer located between the first substrate and the second substrate. The lens layer includes a plurality of lens units; each of the plurality of lens units includes two electrodes and a lens located between the two electrodes with an adjustable focal length; the lens includes charged particles and a first transparent insulating liquid encapsulated by a transparent flexible film; the charged particles include positively charged particles and negatively charged particles.