Light Field Display Adjusting Pixel Rendering for Vision Correction
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Solution Overview
Problem
Current digital displays, particularly light field displays, face challenges in providing effective vision correction for users with reduced visual acuity due to spatio-angular resolution trade-offs, which result in reduced image quality and contrast, and existing methods either compromise on resolution or computation power.
Innovation Solution
A computer-implemented method and system that adjusts user perception of images on digital displays by using an array of light field shaping elements to calculate and project adjusted image rays, allowing for perceptively improved image rendering without the need for corrective eyewear, by digitally mapping images and associating adjusted pixel values based on user pupil location and light field directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light field displays with lenslet arrays or parallax barriers are used to correct visual aberrations, then angular resolution is improved, but spatial resolution deteriorates significantly
Solution Approach 1:
The patent transitions from 2D display to 4D light field display by adding angular and temporal dimensions. The light field display controller adjusts pixel rendering in multiple dimensions (spatial, angular, temporal) to compensate for visual aberrations, thereby improving angular resolution without sacrificing spatial resolution as in conventional approaches.
Solution Approach 2:
The system performs preliminary calculations of adjusted pixel values before rendering. The light field display controller pre-computes the adjusted image plane and pixel values based on viewer position and visual aberration characteristics, then applies these pre-calculated values to the display, enabling real-time correction without compromising resolution.
2Reliability
If multi-layer displays with prefiltering are used to correct optical aberrations, then visual aberration correction is improved, but image contrast is significantly reduced
Solution Approach 1:
The patent applies different rendering strategies to different regions of the display. The light field display controller adjusts pixel values locally based on the specific visual aberrations and viewer position, rather than applying uniform prefiltering across the entire display. This localized adjustment maintains image contrast while correcting aberrations.
Solution Approach 2:
The system dynamically changes display parameters (pixel values, brightness, contrast) based on viewer position and visual characteristics. Instead of fixed prefiltering, the light field display controller continuously adjusts rendering parameters to optimize both aberration correction and image contrast for each viewing condition.
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 implements partial pre-computation of adjusted pixel values. The light field display controller calculates adjusted values for the specific region of interest and current viewer position, rather than pre-computing the entire image. This selective approach reduces computation time and power consumption while maintaining image quality.
Solution Approach 2:
The system dynamically adjusts the rendering process based on real-time viewer position and movement. The light field display controller continuously updates the adjusted image plane and pixel values as the viewer moves, optimizing computation by only recalculating affected regions rather than the entire display, thereby reducing power consumption.
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 enhances image clarity and contrast for users with reduced visual acuity, providing clear and focused images without the need for corrective eyewear, while maintaining acceptable computation and power efficiency.
Implementation Method 1
a digital display device operable to automatically adjust user perception of an input image to be displayed thereon, the device comprising: a digital display medium comprising an array of pixels and operable to render a pixelated image accordingly; an array of light field shaping elements to shape a light field emanating from at least some of said pixels and thereby at least partially govern a projection thereof from said display medium toward the user
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
Described are various embodiments of a computer-implemented method, automatically implemented by one or more digital processors, to automatically adjust user perception of an input image to be rendered on a digital display via a set of pixels thereof, wherein the digital display has an array of light field shaping elements (LFSE).