Autostereoscopic Display Slant Calibration Using Phase Offsets

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Solution Overview

Problem

Existing methods for measuring the slant and pitch distance of autostereoscopic displays are inaccurate, particularly for high-resolution displays, leading to suboptimal image rendering due to manufacturing tolerances.

Innovation Solution

A method and system for determining the slant and pitch distance of autostereoscopic displays by generating a test pattern, capturing images at horizontally and vertically offset positions, and analyzing the phase differences to correct estimated values, allowing for more accurate and faster determination of these parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing methods (Hwang et al.) are used to measure slant and pitch distance, then the measurement process can be completed, but the measurement accuracy is insufficient for high-resolution autostereoscopic displays

Engineering Contradiction:

Improveslant measurement accuracyVSAvoidimage rendering quality

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent segments the measurement process into multiple stages: first determining the slant angle using phase difference analysis at multiple positions, then using this slant information to accurately determine the pitch distance. This segmentation allows each parameter to be measured with higher precision independently, resolving the accuracy issue for high-resolution displays.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new measurement dimension by capturing images at multiple horizontally and vertically offset positions rather than using a single viewpoint. This multi-position approach creates additional measurement dimensions that enable more accurate phase difference calculations, thereby improving slant measurement accuracy for high-resolution displays.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If manufacturing tolerances are accounted for by using nominal values, then the display can be manufactured, but the actual slant and pitch distance values deviate from design specifications

Engineering Contradiction:

Improvedisplay manufacturingVSAvoidslant and pitch distance conformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent implements a feedback mechanism where the measured actual slant and pitch distance values are fed back to correct the nominal values used in image processing. This feedback loop allows the system to adapt to manufacturing variations, ensuring that the final image rendering compensates for tolerances and maintains high precision despite manufacturing constraints.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If the slant and pitch distance are determined accurately, then the interleaving can be adapted to actual values, but the measurement process becomes more complex

Engineering Contradiction:

Improveslant and pitch distance accuracyVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent employs a self-service approach where the display system itself performs the measurement and calibration using its own display capabilities. By displaying test patterns and capturing images through the display's optical path, the system self-calibrates without requiring external complex measurement equipment, thereby reducing overall system complexity while maintaining high measurement precision.

Inventive Principle:

Principle #25Self-service

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 method enables precise measurement of slant and pitch distance, improving image consistency across the display and enhancing the stereoscopic viewing experience, especially for high-resolution displays like 4K and 8K.

Implementation Method 1

an array of elongated optical elements for redirecting light emitted by the display elements in mutually different directions

Methodology Applied

Scientific EffectLight redirection: Refraction

Implementation Method 2

capturing one or more images of the display panel when the display data is displayed by the autostereoscopic display

Methodology Applied

Scientific EffectImage capture: Photography

Data Source

PatentUS20250385998A1Determining slant and pitch of an autostereoscopic display

Publication Date: 2025.12.18 ULTRA D COOPERATIEF U A

AI summary

A system and method are provided for determining a slant and optionally a pitch distance of an autostereoscopic display by generating and displaying a test pattern on the autostereoscopic display, capturing one or more images of the displayed test pattern, and determining the slant by determining a first phase at a first position in the image, determining a second phase at a second position in the image, and determining the slant of the optical elements based on a difference between the first phase and the second phase. Advantageously, the first position and the second position are horizontally and vertically offset from each other in accordance with an assumed value of the slant. This allows the slant measurement to be less susceptible to errors in the assumed pitch distance. In particular, the slant may be determined first, largely independent of the pitch distance, after which the pitch distance may be determined on the basis of the determined slant. Thereby, the slant and optionally the pitch distance may be determined more accurately and/or faster.