Interlaced Image Projection Scan Patterns for Line Artifact Reduction

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Solution Overview

Problem

Interlaced scan configurations in scanning image displays and projection systems introduce undesirable line separation artifacts that degrade image viewability.

Innovation Solution

Employ a multiple interlaced scan configuration with variable scan patterns, using randomly, pseudo-randomly, or quasi-randomly selected scan patterns for each image field to reduce the repetition of scan patterns across images, thereby minimizing line separation artifacts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If interlaced scan configuration is used, then apparent frame rate is increased and flicker is reduced, but line separation artifacts are introduced that degrade image viewability

Engineering Contradiction:

Improveapparent frame rateVSAvoidline separation artifacts

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by making the scan pattern variable rather than fixed. The scan pattern changes from image to image using random, pseudo-random, or quasi-random selection, preventing the repetition that causes line separation artifacts while maintaining the interlaced scan configuration's benefits for frame rate and flicker reduction

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the scan pattern parameters between images. By varying the scan pattern (position, orientation, or other characteristics) from one image to the next, the system eliminates the repetitive scanning that creates line separation artifacts while preserving the interlaced scan structure that provides high apparent frame rate

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If fixed scan pattern is used across images, then scanning system is simple to operate, but line separation artifacts occur that degrade image quality

Engineering Contradiction:

Improvescanning system operationVSAvoidimage quality

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The system transitions from a static scan pattern to a dynamic one where the scan pattern automatically varies between images. This dynamic variation is implemented through automated random or pseudo-random selection mechanisms, maintaining ease of operation while eliminating line separation artifacts that plague fixed scan patterns

Inventive Principle:

Principle #15Dynamics

3Device complexity

If scan pattern is replicated from image to image, then system complexity is minimized, but line separation artifacts are introduced

Engineering Contradiction:

Improvescan pattern variation mechanismVSAvoidline separation artifacts

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces minimal complexity by implementing dynamic scan pattern variation through random or pseudo-random selection. This approach requires only simple selection logic and pattern storage, avoiding complex hardware modifications while effectively eliminating line separation artifacts through pattern diversity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12529889B2Method and system for reducing line separation artifacts in interlaced image projection

Publication Date: 2026.01.20 MAGIC LEAP INC

AI summary

An image display system includes an optical subsystem configured to emit a modulated light beam, and a scanning mirror for generating a reflected light beam that is scanned according to randomly selected or pseudo-randomly selected scan patterns to generate multiple image fields of a multiple interlaced scan image. A plurality of different scan patterns can be cycled through, randomly or pseudo-randomly selected, for the different image fields to reduce artifacts that may be observed while viewing a projected image.