Complementary Light Field Display for Vision-Corrected Text Rendering
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Solution Overview
Problem
Current digital display technologies, such as light field displays, face limitations in providing effective vision correction for users with reduced visual acuity, often resulting in a spatio-angular resolution trade-off that compromises image quality, and require significant computational resources and power.
Innovation Solution
A digital display device incorporating a complementary light field display and a vision correction system that uses a light field shaping layer and a hardware processor to selectively adjust pixel data for improved image perception, specifically for text regions, by implementing a digitally executed ray tracing process to enhance clarity and contrast without the need for corrective eyewear.
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 display is segmented into a conventional display portion and a complementary light field display portion. The light field portion uses an array of microlenses (lenslets) to provide angular resolution for vision correction, while the conventional display maintains spatial resolution. This segmentation allows each portion to optimize its function without compromising the other.
Solution Approach 2:
Different regions of the display have different optical properties. The complementary light field display portion specifically addresses vision correction needs by providing angular resolution through microlens arrays, while other portions maintain standard display characteristics. This local differentiation resolves the contradiction by applying light field technology only where angular resolution is needed.
2Manufacturing precision
If multilayer display designs with prefiltering are used, then spatial resolution is improved, but image contrast deteriorates
Solution Approach 1:
The patent extracts the vision correction function into a separate complementary light field display portion rather than using it in a multilayer design with prefiltering. This extraction avoids the contrast reduction problem inherent in multilayer designs while maintaining the spatial resolution benefits through the conventional display portion.
3Manufacturing precision
If viewer-adaptive pre-filtering with parallax barriers is used, then contrast and resolution are improved, but computational time and power increase
Solution Approach 1:
The light field shaping layer (microlens array) is pre-configured to provide the necessary angular resolution for vision correction. This preliminary optical configuration eliminates the need for real-time computational adjustments, thereby reducing computational time and power consumption while maintaining resolution.
4Ease of operation
If software-based accessibility features are used, then ease of operation is improved, but measurement precision of visual correction deteriorates
Solution Approach 1:
The patent replaces software-based accessibility features with a hardware-based light field display solution. The microlens array physically shapes light rays to correct visual aberrations, providing precise optical correction rather than relying on software manipulation. This substitution maintains ease of operation while dramatically improving visual correction precision.
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 sharper and more discernable text and image features for users with reduced visual acuity, reducing computational load and maintaining image quality, while allowing for dynamic processing of selected image portions to improve user experience without the use of corrective lenses.
Implementation Method 1
a light field shaping layer (LFSL) defined by an array of LFSL elements and disposed relative to said digital display medium so to dispose each of said LFSL elements over an underlying 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 viewer
Implementation Method 2
a hardware processor operable on pixel data to output vision-corrected pixel data to be rendered via said digital display medium and projected through said LFSL so to produce a designated image perception adjustment that at least partially addresses the viewer's reduced visual acuity
Data Source
AI summary
Described are various embodiments of a digital display device to render an image for viewing by a viewer having reduced visual acuity, the device comprising: a digital display medium for rendering the image based on pixel data related thereto; a complementary light field display portion; and a hardware processor operable on said pixel data for a selected portion of the image to be rendered via said complementary light field display portion so to produce vision-corrected pixel data corresponding thereto to at least partially address the viewer's reduced visual acuity when viewing said selected portion as rendered in accordance with said vision-corrected pixel data by said complementary light field display portion.