Perforated Image Display Screen Layout for Moiré Reduction
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Solution Overview
Problem
Moiré patterns, which are visually perceptible beats resulting from rational relationships between the spatial frequencies of pixel and perforation patterns in image displays, are not adequately addressed by existing technologies, leading to noticeable visual artifacts.
Innovation Solution
Implementing a semi-random perforation pattern on image displays, generated through techniques such as halftoning and noise injection, to distribute perforation holes in a spatially random manner that avoids forming rational relationships with pixel frequencies, thereby reducing or eliminating Moiré patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a regular patterned perforation is used on the screen, then sound waves can pass through toward viewers, but Moiré patterns appear as visual artifacts when spatial frequencies form rational relationships with pixel patterns
Solution Approach 1:
The patent applies asymmetry by using non-uniform hole sizes (three or more different diameters) and irregular spacing patterns instead of a regular grid. This asymmetric distribution breaks the rational frequency relationships between perforations and pixels that cause Moiré patterns, while still maintaining sufficient sound transmission through strategic placement of varying aperture sizes.
Solution Approach 2:
The patent changes multiple parameters of the perforation pattern simultaneously: hole diameter (using three or more different sizes), spacing between holes, and distribution density. By varying these parameters in a pseudo-random manner rather than maintaining constant values, the system eliminates the periodicity that causes Moiré interference while preserving acoustic functionality.
2Object-affected harmful factors
If multiple hole sizes are used in pseudo-random positions to eliminate Moiré patterns, then visual uniformity improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by assigning different hole sizes and spacing characteristics to different regions or positions on the screen based on local requirements. Each location has optimized perforation properties tailored to its specific context, creating overall visual uniformity through local variations rather than global uniformity, which simplifies the manufacturing approach compared to truly random patterns.
Data Source
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AI summary
One or more perforation hole pattern methods are applied (402) to generate a spatial distribution of perforation holes forming a semi-random pattern for an image display screen. The image display screen is perforated (404) with the spatial distribution of perforation holes forming the semi-random pattern. Image rendering light is emitted (406) with a light projector toward the image display screen that is installed in an image rendering environment. At least a portion of the image rendering light emitted from the light projector is reflected (408) by the image display screen, toward a viewer.