Multi-Display Timing Control via One-to-One Command Delays
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Solution Overview
Problem
In multi-display systems where display devices communicate on a one-to-one basis instead of using broadcast commands, existing technologies struggle to synchronize video control timings, leading to video distortion due to deviations in execution times.
Innovation Solution
A display device and multi-display system that includes a communication controller to notify each display device of a control command with additional waiting time information, ensuring synchronized execution times through one-to-one communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one-to-one communication is used between display devices, then communication flexibility and resource utilization are improved, but control execution timing synchronization deteriorates
Solution Approach 1:
The master display device performs preliminary actions by calculating and transmitting delay times to slave display devices before the actual control execution. Each slave device receives the control command with its specific delay time in advance, allowing it to prepare for synchronized execution at the correct future moment, thus resolving the timing synchronization issue while maintaining one-to-one communication flexibility
2Manufacturing precision
If broadcast command control is used, then control execution timing synchronization is improved, but device complexity and communication overhead increase
Solution Approach 1:
The system segments the broadcast control approach into individual one-to-one communication channels between master and slave display devices. Instead of using a single broadcast command that requires complex reception and processing by all devices simultaneously, the control is divided into separate communication transactions, each with calculated delay times, reducing overall system complexity while maintaining synchronization
3Device complexity
If one-to-one communication is performed without delay time adjustment, then communication simplicity is improved, but video distortion increases
Solution Approach 1:
The system changes the parameter of communication timing by introducing delay time adjustments in the control commands transmitted from master to slave display devices. This parameter modification allows each slave device to execute control commands at the correct synchronized moment, preventing video distortion while keeping the one-to-one communication structure simple and easy to implement
Data Source
AI summary
A video input terminal inputs a video signal. A video output terminal outputs the video signal input to the video input terminal. A communication terminal performs one-to-one communication with each of a plurality of display devices. A communication controller notifies each of the plurality of display devices of a control command including control information for issuing an instruction to execute a specific process by switching a destination of communication via the communication terminal and additional information indicating a waiting time before a process corresponding to the control information is executed.