Multi-Projector Brightness Uniformity via Closed-Loop Feedback
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Solution Overview
Problem
Existing projection systems using multiple projectors struggle to achieve uniform brightness across stitched images, as current automatic adjustment methods only address individual projectors and not the entire system, leading to unsatisfactory brightness uniformity, especially in large exhibitions.
Innovation Solution
A projection system comprising multiple projection devices, brightness collecting devices, and a processing unit that adjusts projection brightness via an infrared communication network to ensure each device's brightness falls within a preset range, ensuring uniformity across all projected images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple projectors are used to display images on a large screen, then the visual impact and information transmission are improved, but the brightness uniformity of the stitched images deteriorates due to different projection brightness of each projector
Solution Approach 1:
The patent implements a feedback mechanism where brightness collecting devices mounted on the projection plane collect actual brightness values of each projector's output. The processing unit receives these values and compares them against preset ranges, then automatically adjusts each projector's brightness through a brightness adjusting unit until uniformity is achieved. This closed-loop feedback system eliminates manual adjustment and ensures consistent brightness across all projectors.
Solution Approach 2:
The system enables projectors to automatically adjust their own brightness based on collected feedback data. Each projector's brightness adjusting unit autonomously modifies its output based on the actual brightness values collected by its corresponding brightness collecting device, without requiring external manual intervention for each device.
2Manufacturing precision
If manual adjustment of projector brightness is performed to achieve uniform image brightness, then the brightness uniformity is improved, but the time cost and operational complexity increase significantly
Solution Approach 1:
The system enables projectors to automatically adjust their own brightness based on collected feedback data. Each projector's brightness adjusting unit autonomously modifies its output based on the actual brightness values collected by its corresponding brightness collecting device, without requiring external manual intervention for each device.
Solution Approach 2:
The patent implements a feedback mechanism where brightness collecting devices mounted on the projection plane collect actual brightness values of each projector's output. The processing unit receives these values and compares them against preset ranges, then automatically adjusts each projector's brightness through a brightness adjusting unit until uniformity is achieved. This closed-loop feedback system eliminates manual adjustment and ensures consistent brightness across all projectors.
3Adaptability or versatility
If automatic brightness adjustment is implemented for a single projector based on ambient light, then the projection brightness adaptation is improved, but the brightness uniformity across multiple projectors deteriorates because each projector adjusts independently without system-wide coordination
Solution Approach 1:
The patent implements a feedback mechanism where brightness collecting devices mounted on the projection plane collect actual brightness values of each projector's output. The processing unit receives these values and compares them against preset ranges, then automatically adjusts each projector's brightness through a brightness adjusting unit until uniformity is achieved. This closed-loop feedback system eliminates manual adjustment and ensures consistent brightness across all projectors.
Solution Approach 2:
The patent merges the brightness adjustment functions of multiple independent projectors into a coordinated system. By having the processing unit centrally manage brightness values from all projectors and coordinate adjustments across all brightness adjusting units, the system achieves unified brightness control that maintains both individual adaptation and overall uniformity.
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 automatically adjusts projection brightness of all devices to a uniform range, unaffected by ambient light, providing a consistent viewing experience by accurately controlling each device's output within a predetermined brightness value range.
Implementation Method 1
brightness collecting device disposed on the projection plane, configured to collect brightness information on the projection plane
Implementation Method 2
the brightness collecting device sends the collected brightness information to the processing unit through the infrared emitter
Data Source
AI summary
The present disclosure provides a projection device, a projection system and a method for adjusting projection brightness of the projection system. The method includes: projecting, by a projection unit of each projection device, an image on a projection plane corresponding to the projection unit separately; collecting, by a brightness collecting device, brightness information on the projection planes separately, and sending the brightness information to the projection device; receiving, by a processing unit, the brightness information, and obtaining an actual brightness value of projection of the projection device after processing the brightness information; determining whether the actual brightness value is within a preset brightness value range of the projection device; when the actual brightness value is not within the preset brightness value range; adjusting, by a brightness adjusting unit, the projection brightness of the projection device until the actual brightness value falls within the preset brightness value range.