Multi-Display Synchronization via Readout Control Signals
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Solution Overview
Problem
In multi-display systems, synchronizing display timings across different display devices when video signals are played separately by their video playback functions is challenging, leading to potential desynchronization of video content.
Innovation Solution
Incorporating a readout control signal mechanism within each display device to synchronize video signal readout timings, using a memory unit to store video signals and a readout control unit to manage the timing of video signal retrieval and display, ensuring that all devices display the video content in sync.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video signals are separately played by the video playback functions of the respective display devices, then the video signals can be generated in the respective display devices without being sent through daisy chained signal lines, preventing signal deterioration and avoiding enlargement processes, but the display timings in the respective display devices may not be synchronized
Solution Approach 1:
A readout control signal is introduced as an intermediary mechanism to coordinate the independent video playback functions of multiple display devices. This signal is transmitted through the existing daisy-chained signal lines to synchronize the readout timing of video signals from local memories across all devices, ensuring synchronized display without compromising signal quality
Solution Approach 2:
The patent combines the video signal transmission function with the readout control signal transmission function using the same daisy-chained signal lines. By merging these functions, the system achieves synchronization without requiring separate synchronization lines, thus preventing signal deterioration while maintaining timing coordination
2Loss of time
If video signals are transmitted through daisy chained signal lines to multiple display devices, then the display timings can be synchronized, but the video signals may deteriorate and enlargement processes are needed
Solution Approach 1:
The video signal is segmented into two separate paths: the video signal itself is stored locally in each display device's memory and not transmitted through the daisy chain, while only the readout control signal is transmitted through the daisy-chained lines. This segmentation prevents video signal deterioration while maintaining synchronization
Solution Approach 2:
The synchronization function is extracted from the video signal transmission path. Instead of synchronizing through the video signal itself, the system extracts and transmits only the necessary readout control signal through the daisy chain to coordinate independent local video playback, avoiding video signal deterioration
3Loss of time
If additional synchronization lines are added to synchronize display timings across multiple display devices, then the display timings can be synchronized, but the device complexity increases
Solution Approach 1:
The daisy-chained signal lines are given multi-functionality by using them for both video signal transmission and readout control signal transmission. This universal use of existing infrastructure eliminates the need for additional synchronization lines, maintaining system simplicity while achieving synchronization
Data Source
AI summary
A display device includes: a video playback unit configured to play video media including multiple frames; a first memory unit configured to store a video signal of the video media that is being played; an acquisition unit configured to acquire a readout control signal representing a readout timing for playing each frame in the video media in a first display device different from an own display device in a multi-display system formed from multiple display devices; a readout control unit configured to cause frames of the video signal corresponding to the readout controls signal to be sequentially read out from the first memory unit in accordance with the acquired readout control signal; and a display control circuit configured to display, on a display unit, the frames of the video signal that have been read out.