Multi-Screen Display Synchronization via Phase Difference Feedback
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Solution Overview
Problem
Existing multi-screen display systems face challenges in synchronizing image updating across multiple display devices due to network delays, as they lack effective mechanisms to adjust for phase differences and frequency discrepancies between the transmitting device and display devices.
Innovation Solution
A multi-screen display system that includes a transmitting apparatus generating a reference clock and synchronization adjustment data, and display devices that receive and adjust image data timing to synchronize image updates, using a system master clock to ensure synchronized image reproduction across all devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an image signal repeater replaces the clock signal based on synchronizing signal with an internally generated replacement clock and regenerates the input image signal, then the phase difference between input and reproduced image signals is canceled, but synchronization of image updating among multiple display devices is not achieved due to network delay
Solution Approach 1:
The system introduces a feedback mechanism where each display device measures the actual phase difference between its reproduced image signal and the synchronizing signal, then feeds this information back to the image signal repeater. The repeater uses this feedback to dynamically adjust the replacement clock signal, enabling precise phase difference cancellation across multiple devices while accounting for network delays.
Solution Approach 2:
The invention transitions from a static clock replacement approach to a dynamic adjustment system. The replacement clock signal is continuously modified based on real-time phase difference measurements from multiple display devices, allowing the system to adapt to varying network conditions and maintain synchronization across all devices.
2Measurement precision
If an internally generated replacement clock is used to regenerate the input image signal, then frequency difference correction is enabled, but network delay from transmitting device to display devices affects synchronization
Solution Approach 1:
The system performs preliminary actions by having each display device measure and report its phase difference before the next image update cycle. The image signal repeater uses these pre-measured values to pre-adjust the replacement clock signal, compensating for network delays in advance and ensuring synchronized updates.
Solution Approach 2:
A feedback loop is established where phase difference information from display devices is continuously transmitted back to the image signal repeater. This feedback enables the system to detect and correct frequency differences while compensating for network delay effects, maintaining precise synchronization.
Data Source
AI summary
The image update timings of a plurality of display devices are adjusted by calculating, in their image reproduction/updating control means (7), the phase difference between a synchronization adjustment signal (SAS) created from synchronization adjustment data (SAD) received from the transmitting apparatus TA by a data reception means (6) and an image display control signal (HC) output to the image display means (8), and increasing or decreasing the period of the next and subsequent image display control signals (HC) according to the phase difference, thereby reducing the phase difference. Image updating in the plurality of display devices can be synchronized to within a fixed tolerance range.