Light Field Display Microlens Misalignment for Vision Correction
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Solution Overview
Problem
Current digital display technologies fail to effectively correct visual aberrations in users with reduced vision acuity, as they often compromise on spatial or angular resolution, contrast, and computational power, making them unsuitable for portable devices and applications requiring vision correction.
Innovation Solution
A digital display system incorporating a light field shaping layer with a geometric misalignment of microlens arrays relative to the pixel array, combined with a hardware processor that adjusts image pixel data to optimize image perception, allowing for improved resolution and contrast without the need for corrective eyewear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light field displays use lenslet arrays or parallax barriers to correct visual aberrations, then angular resolution is improved, but spatial resolution deteriorates significantly
Solution Approach 1:
The patent transitions from 2D display to 3D light field display by adding the angular dimension. The lenslet array creates multiple virtual images at different depths, enabling the system to correct visual aberrations by controlling light rays in three dimensions rather than just on a flat screen plane.
Solution Approach 2:
The display is segmented into multiple lenslets arranged in an array, where each lenslet corresponds to a specific angular direction. This segmentation allows independent control of light rays for different viewing angles, enabling precise angular resolution while maintaining spatial resolution through proper lenslet-pixel mapping.
2Manufacturing precision
If multilayer display designs with prefiltering are used to mitigate spatio-angular resolution trade-off, then spatial resolution is improved, but image contrast deteriorates significantly
Solution Approach 1:
The patent applies prefiltering to the input image before rendering it through the light field display. This preliminary processing step adjusts the image content to account for the optical characteristics of the lenslet array, ensuring that the final displayed image maintains both spatial resolution and contrast by pre-compensating for potential losses.
3Manufacturing precision
If viewer-adaptive pre-filtering with off-the-shelf parallax barriers is used to increase contrast and resolution, then image quality is improved, but computation time and power consumption increase
Solution Approach 1:
The patent adjusts rendering parameters such as the number of rays per pixel, sampling density, and prefiltering strength based on the viewer's specific visual characteristics. By dynamically changing these parameters, the system optimizes the balance between image quality and computational requirements, reducing power consumption while maintaining visual correction effectiveness.
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 system provides clear and focused images for users with reduced visual acuity by geometrically misaligning the microlens array with the pixel array, enhancing image perception and reducing computational power requirements, making it suitable for portable devices and various applications.
Implementation Method 1
a light field shaping layer with a geometric misalignment of microlens arrays relative to the pixel array
Data Source
AI summary
Described are various embodiments of a digital display device for use by a user having reduced visual acuity. In one embodiment, the device comprises: a digital display medium comprising an array of pixels and operable to render a pixelated image accordingly; a light field shaping layer defined by an array of light field shaping elements and disposed relative to said digital display so to align each of said light field shaping elements with a corresponding set of said pixels to shape a light field emanating therefrom and thereby at least partially govern a projection thereof from said display medium toward the user; and a hardware processor operable on pixel data for the image such that said processed image is rendered to at least partially compensate for the user’s reduced visual acuity.