Multi-Projection Display Brightness Matching via Local Sensor Feedback
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Solution Overview
Problem
Large-scale multi-projection display systems face challenges in maintaining uniform brightness across multiple projector units, leading to visible seams and increased complexity as the number of units and screen size increase, making it difficult to expand the system without compromising thickness and processing efficiency.
Innovation Solution
A multi-projection display system with sensor units to detect brightness for each color of projected images and an image signal correction unit that generates a brightness correction table to match the brightness of adjacent projector units, allowing each projector unit to autonomously adjust its output and eliminate the need for extensive main control unit processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of projector units is increased to enlarge the screen size, then the display area is improved, but the processing complexity of the main control unit increases significantly
Solution Approach 1:
The patent divides the brightness adjustment function into independent segments, with each projector unit equipped with its own sensor unit and image signal correction unit. This segmentation allows each projector to autonomously adjust its brightness based on local measurements from its adjacent projector, eliminating the need for the main control unit to process brightness data from all projectors centrally. The system is divided into autonomous modules that operate independently yet cooperatively.
Solution Approach 2:
Each projector unit performs brightness adjustment based on local conditions detected by its own sensor unit, which measures the brightness of adjacent projectors. The image signal correction unit applies localized brightness correction to each projector's output based on these local measurements. This local quality approach ensures that each projector adapts to its specific position and neighboring conditions without requiring global system-wide processing.
2Area of stationary object
If the screen size is increased, then the display area is improved, but the thickness of the multi-projection display system increases
Solution Approach 1:
The patent extracts the brightness measurement and correction functions from the main control unit and places them directly within each projector unit. By taking out these functions and embedding them locally in each projector with its dedicated sensor unit, the system eliminates the need for a separate, bulky measurement and control subsystem that would increase overall system thickness. The sensor unit is positioned to capture images of adjacent projectors without requiring additional space.
3Manufacturing precision
If the brightness of projected images is adjusted to match between projector units, then the display quality is improved, but the processing load on the main control unit increases
Solution Approach 1:
Each projector unit performs self-adjustment of its brightness by autonomously measuring the brightness of adjacent projectors using its sensor unit and applying corrections through its image signal correction unit. This self-service mechanism eliminates the need for the main control unit to calculate and distribute brightness adjustment parameters to all projectors, significantly reducing its processing load. Each projector independently services its own brightness matching requirements based on real-time local measurements.
Solution Approach 2:
The sensor unit in each projector unit continuously monitors the brightness of adjacent projectors and provides feedback to the image signal correction unit. This feedback loop enables real-time brightness adjustment, where the correction unit modifies the image signal based on the measured brightness differences. The feedback mechanism ensures accurate brightness matching while distributing the processing burden to individual projectors rather than concentrating it in the main control unit.
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
Enables easy expansion of projector units while maintaining uniform brightness across the screen, reducing processing load on the main control unit and allowing for a thinner, large-screen display system by limiting brightness detection range and eliminating the need for extensive adjacent information acquisition units.
Implementation Method 1
a plurality of sensor units that are provided corresponding to the projector units and that detect brightness for each color of projected images that are projected on the screen from the projector units
Data Source
AI summary
A multi-projection display system is provided with a plurality of sensor units corresponding to projector units. The sensor units detect brightness for each color in a projected image that is projected on a screen and supply the detection results. The projector unit generates a brightness correction table on the basis of the image signal of a specific picture element of the projected image realized by an adjacent projector unit and on the basis of the brightness of the specific picture element of the projected image of the adjacent projector unit that is detected by a sensor unit for matching the brightness of the image projected by its own projector unit with that of the adjacent projector unit, refers to the brightness correction table to correct brightness for each color of the image signals that are received as input, and projects onto a screen the light of each color in accordance with the corrected image signals.