Multi-Projector Display Brightness Uniformity Control
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Solution Overview
Problem
Existing display systems with multiple projectors face issues with brightness unevenness when projecting images with different brightness levels, leading to a darkened tiling image when adjusting for uniformity.
Innovation Solution
A control method and device that estimate the brightness of composite images projected by multiple projector groups, identify the darkest image and adjust the brightness of specific projectors to match that of the darkest image, thereby enhancing the overall brightness of the displayed images without making them too dark.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the brightness of each projector is reduced to match the darkest image, then brightness uniformity is improved, but the overall brightness of the tiling image deteriorates
Solution Approach 1:
The patent divides the display system into multiple projector groups, where each group projects to a specific display area. By segmenting the system, the control device can independently adjust brightness for each group based on its composite image brightness, rather than uniformly reducing all projectors' brightness. This allows maintaining overall brightness while achieving local uniformity.
Solution Approach 2:
The patent applies different brightness adjustment strategies to different projector groups based on their individual composite image brightness characteristics. Instead of applying a uniform brightness reduction to all projectors, the system selectively adjusts only those projectors whose composite images exceed the minimum brightness threshold, thereby preserving overall brightness while achieving local uniformity.
2Stability of the object's composition
If multiple projectors are adjusted to achieve brightness uniformity, then brightness uniformity is improved, but control complexity and adjustment time increase
Solution Approach 1:
The patent implements partial adjustment by only modifying the brightness of projectors whose composite images exceed the minimum brightness threshold. The control device identifies the darkest composite image and compares other composite images against this baseline, adjusting only those that are excessively bright. This partial action approach reduces control complexity and adjustment time while still achieving adequate brightness uniformity.
3Illumination intensity
If all projectors project images with different brightness levels, then individual projector brightness is maintained, but brightness uniformity of the composite image deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the control device estimates the brightness of composite images projected by each projector group, identifies the darkest composite image, and uses this information to adjust the brightness of other projector groups. This feedback loop ensures that brightness uniformity is achieved while maintaining adequate overall brightness levels.
Data Source
AI summary
A method of controlling a display system including the steps of projecting, by a plurality of group-belonging projectors, an image in one display area corresponding to one projector group to thereby display one composite image corresponding to the one projector group out of a plurality of composite images corresponding one-to-one to a plurality of projector groups in the one display area, estimating, by a control device, brightness of the plurality of composite images, identifying, by the control device, a dark image which is the darkest and a first adjustment target image different from the dark image from the plurality of composite images based on a result of the brightness estimation, and controlling, by the control device, at least one projector in the projector group corresponding to the first adjustment target image to thereby approximate brightness of the first adjustment target image to brightness of the dark image.