Light Field Near-Eye Display Vision Correction via Liquid Crystal Lens
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Solution Overview
Problem
Traditional light field near-eye displays face challenges in providing good image quality for users with abnormal vision due to limitations in passive and active vision correction methods, including insufficient diopter correction, image quality degradation, and increased system volume.
Innovation Solution
A light field near-eye display device comprising a processor, a display panel, and a lens module with a micro lens array, which adjusts the eye box and image data based on user vision data to emit an image beam that displays a light field image in focus, addressing the limitations of existing correction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive vision correction lenses are used, then spherical aberration can be corrected, but additional customized lenses are needed for cylinder power and axis angle correction which increases cost and device complexity
Solution Approach 1:
The patent employs a liquid crystal lens that can dynamically adjust its optical properties including diopter, cylinder power, and axis angle based on user vision parameters. This dynamic adjustment capability eliminates the need for multiple fixed correction lenses, allowing a single element to adapt to different vision correction requirements through electrical control rather than physical replacement.
Solution Approach 2:
The liquid crystal lens changes its optical parameters (focal length, astigmatism correction values) by altering its physical state through applied voltage. This parameter change mechanism enables the lens to provide different correction levels for spherical and cylindrical aberrations without requiring physical replacement, thus reducing device complexity while maintaining comprehensive vision correction capability.
2Adaptability or versatility
If dynamic elements like liquid crystal lenses are used for active vision correction, then diopter and spherical aberration can be adjusted, but the system volume increases and image quality may be degraded
Solution Approach 1:
The patent integrates the vision correction lens directly into the existing optical path of the light field display system, merging the correction function with the display optics rather than adding it as a separate external component. This integration allows the correction element to be part of the core optical assembly, minimizing additional volume while providing comprehensive vision adjustment capability.
3Adaptability or versatility
If dynamic elements are integrated into the near-eye display system, then active vision correction is achieved, but effective aperture is reduced and image quality is degraded
Solution Approach 1:
The patent performs preliminary optimization of the liquid crystal lens design and its integration into the optical system to minimize negative impacts on image quality. By pre-calculating and pre-positioning the correction element in the optimal location within the optical path, the system maintains large effective aperture while achieving vision correction, thus preventing image quality degradation before it occurs.
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 enables automatic adjustment of image data to provide a light field image with good image quality, suitable for users with abnormal vision, by accurately positioning the image beam within the user's focus range, thus improving image clarity and reducing system complexity.
Implementation Method 1
The lens module includes a micro lens array and is disposed between the display panel and a pupil. The image beam is incident on the pupil via the lens module
Data Source
AI summary
A light field near-eye display device and a method of light field near-eye display are provided. The light field near-eye display device includes a processor, a display panel, and a lens module. The processor adjusts a preset eye box according to a vision data to obtain an adjusted eye box, and adjusts a preset image data according to the adjusted eye box to generate an adjusted image data. The display panel is coupled to the processor and emits an image beam according to the adjusted image data. The lens module includes a micro lens array and is disposed between the display panel and a pupil. The image beam is incident on the pupil via the lens module and displays a light field image.