Studio LED Display Synchronization with Camera Shutter
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Solution Overview
Problem
Existing studio display environments, particularly those using LED displays, suffer from banding effects during camera recording due to synchronization issues between the camera shutter time and the PWM signal, leading to suboptimal image quality and energy inefficiency.
Innovation Solution
A method is introduced to improve the interplay between light source displays and cameras by receiving programmable offset values relative to the camera's shutter operation, allowing for synchronized image display that reduces banding effects and enhances energy efficiency. This involves determining optimal programmable offset values for the start and length of the camera shutter opening time, adjusting PWM cycles, and using dynamic frequency clocks to maximize image output within the camera's visibility window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED display uses PWM signal for image display, then the display can achieve high brightness and color quality, but banding effects appear during camera recording due to synchronization issues between PWM and camera shutter
Solution Approach 1:
The patent applies dynamics by making the display system adaptive through programmable offset values that can be dynamically adjusted based on camera shutter timing. The system transitions from a static PWM signal to a dynamic one that responds to camera operation, allowing the display to optimize its timing characteristics in real-time to eliminate banding while preserving brightness quality.
Solution Approach 2:
The patent changes the timing parameters of the PWM signal by introducing programmable offset values that shift the start and duration of the PWM cycle relative to the camera shutter timing. This parameter adjustment allows synchronization between the display refresh and camera exposure, eliminating the banding effect while maintaining the high brightness output of the LED display.
2Manufacturing precision
If the camera shutter time is extended to capture more image detail, then the image quality improves, but the synchronization with PWM signal becomes more difficult and banding effects worsen
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying programmable offset values before the camera exposure begins. The system determines the optimal offset based on the camera's shutter timing characteristics and applies this correction in advance to the PWM signal, ensuring that the display refresh is properly synchronized throughout the entire exposure duration, thereby preventing banding while capturing high-quality images.
3Illumination intensity
If the display continuously updates images at high frequency, then the visual quality for audience viewing improves, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by utilizing the natural periodic nature of both the PWM signal and camera shutter operation. By synchronizing these periodic operations through programmable offset values, the system ensures that the display updates occur at optimal intervals that coincide with camera exposure cycles. This allows the display to maintain high visual quality during camera recording while potentially reducing update frequency during non-recording periods, thereby reducing energy consumption.
4Device complexity
If the PWM signal operates at fixed frequency, then the control is simple, but adaptability to different camera shutter speeds is limited
Solution Approach 1:
The patent transforms the fixed-frequency PWM control into a dynamic system by introducing programmable offset values that can be adjusted based on camera shutter speed. This allows the display to adapt to different camera configurations while maintaining relatively simple control architecture. The system determines appropriate offset values for different camera speeds and applies them programmatically, achieving versatility without significantly increasing control complexity.
Data Source
AI summary
A method is provided for allocating content to be shown on a light source display not being viewable for a first camera in an arrangement comprising the light source display and the first camera recording images displayed by the light source display. The first camera includes a shutter having a shutter opening time. The method including, out of the shutter opening time, displaying on said light source display said content.