Light Field Shaping Layer Misalignment for Vision Correction
Solution Overview
Problem
Current digital display technologies fail to effectively correct visual aberrations for users with reduced vision acuity, as they often compromise on image resolution, contrast, or require bulky and computationally intensive setups, making them unsuitable for portable devices and applications like smartphones or vehicular dashboards.
Innovation Solution
A digital display system featuring a light field shaping layer with a geometric misalignment relative to the pixel array, combined with a hardware processor that adjusts image pixel data to project a corrected image perception, utilizing a microlens array or other optical elements to minimize spot size on the retina and accommodate visual aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light field displays are used to correct visual aberrations, then angular resolution is improved, but spatial resolution deteriorates
Solution Approach 1:
The patent introduces geometric misalignment between the light field shaping layer and pixel array, creating a new dimensional parameter (angular offset) to control light distribution. This allows simultaneous optimization of angular resolution for vision correction and spatial resolution for image quality by operating in both alignment dimensions.
Solution Approach 2:
The patent dynamically adjusts multiple parameters including the geometric misalignment angle, light field shaping element configuration, and pixel mapping relationships to optimize both angular and spatial resolution. By changing these parameters, the system achieves vision correction without sacrificing image resolution.
2Manufacturing precision
If prefiltering is combined with multilayer display designs to mitigate resolution loss, then spatial resolution is improved, but image contrast deteriorates
Solution Approach 1:
The patent replaces traditional prefiltering mechanisms with a geometric misalignment approach using light field shaping elements. This substitution eliminates the need for complex filtering operations that reduce contrast, while achieving the same spatial resolution mitigation through optical geometry and pixel mapping.
3Manufacturing precision
If viewer-adaptive pre-filtering with 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 performs preliminary geometric configuration of the light field shaping layer relative to the pixel array during device setup or manufacturing. This pre-establishes the correction parameters, eliminating the need for real-time computation during operation and significantly reducing processing time and power consumption while maintaining image quality.
4Measurement precision
If layered architecture with color filter arrays is used in light field displays, then angular resolution is improved, but image brightness deteriorates due to interreflections and dimming
Solution Approach 1:
The patent extracts and eliminates the problematic layered color filter array structure from the light field display configuration. By removing these intermediate layers that cause interreflections and light absorption, the system maintains angular resolution through geometric misalignment while preserving image brightness.
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 image rendering without the need for corrective eyewear, improving image quality and reducing computational complexity, making it suitable for portable and vehicular applications.
Implementation Method 1
a light field shaping layer (LFSL) defined by an array of LFSL elements and disposed relative to the digital display medium so to dispose each of the LFSL elements over an underlying set of the pixels to shape a light field emanating therefrom
Implementation Method 2
utilizing a microlens array or other optical elements to minimize spot size on the retina and accommodate visual aberrations
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.