Light Field Display Astigmatism Correction

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Solution Overview

Problem

Current light field displays face challenges in providing effective visual acuity correction for users with astigmatism or similar conditions, as they often compromise on spatial or angular resolution, contrast, or computation power.

Innovation Solution

A light field display system with an array of digital pixels and light field shaping elements, dynamically adjusting pixel rendering to accommodate visual acuity by projecting ray traces, identifying optical vision parameters, and redirecting light rays to create an adjusted image surface that compensates for spherical, cylindrical, and cylindrical axis corrections.

Engineering Contradictions & Design Principles

VSEngineering 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

Engineering Contradiction:

Improveangular resolutionVSAvoidspatial resolution

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent transitions from 2D display to 4D light field display by adding angular and temporal dimensions. The light field display presents multiple views of the same image at different angles simultaneously, allowing the eye to focus at different depths while maintaining both spatial and angular resolution through volumetric light manipulation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The system dynamically adjusts the light field based on real-time eye tracking data. The display content and optical parameters are continuously modified according to the user's gaze direction, focus distance, and accommodation state, enabling adaptive correction of visual aberrations without fixed trade-offs.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If multilayer display designs with prefiltering are used to mitigate spatio-angular resolution trade-off, then spatial and angular resolution are improved, but image contrast deteriorates

Engineering Contradiction:

Improvespatio-angular resolutionVSAvoidimage contrast

Core Design Contradiction:

Manufacturing precisionVSIllumination intensity

Solution Approach 1:

The patent replaces mechanical multilayer prefiltering systems with a computational approach using eye tracking feedback and dynamic light field modulation. This substitution eliminates the need for physical prefiltering layers that cause contrast loss, achieving the same resolution benefits through software-controlled optical modulation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The light field display system uses the user's own eye movements and focus patterns to automatically adjust the display parameters. The eye tracking system provides real-time feedback that enables the display to self-optimize contrast and resolution settings for each user's specific visual characteristics without external intervention.

Inventive Principle:

Principle #25Self-service

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

Engineering Contradiction:

Improveimage qualityVSAvoidcomputation power

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary eye tracking and visual parameter measurement during device setup or idle periods, pre-calculating personalized correction parameters. This preliminary action reduces real-time computational requirements during actual viewing, lowering power consumption while maintaining high image quality.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent dynamically changes display parameters such as refresh rate, resolution, and light field configuration based on detected viewing conditions. When high-quality output is not critical (e.g., during transitions or peripheral viewing), the system reduces computational effort, optimizing the balance between image quality and power consumption.

Inventive Principle:

Principle #35Parameter changes

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 perceptively adjusted images that effectively address visual acuity issues without the need for corrective eyewear, maintaining image quality and reducing computational overhead.

Implementation Method 1

a corresponding array of light field shaping elements (LFSEs) shaping a light field emanating from said pixels

Methodology Applied

Scientific EffectLight field shaping: Refraction

Data Source

PatentEP4022898B1Light field display, adjusted pixel rendering method therefor, and adjusted vision perception system and method using same addressing astigmatism or similar conditions

Publication Date: 2023.10.04 EVOLUTION OPTIKS LTD

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AI summary

Described are various embodiments of a light field display, adjusted pixel rendering method and computer-readable medium therefor, and vision correction system and method using same addressing astigmatism or similar conditions. In one embodiment, a computer- implemented method is provided 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.