Tiled Display Touch Synchronization via Latency Compensation
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Solution Overview
Problem
Synchronization of touch information across tiled display devices is challenging due to latency issues caused by wireless signal transmission, affecting the simultaneous display of images corresponding to touch inputs across multiple devices.
Innovation Solution
A method is introduced where a master display device transmits a reference signal to slave devices, receives ACK signals to determine latency times, and synchronizes touch information based on these latency times, ensuring that touch information is synchronized across all devices for simultaneous display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless signal transmission is used for communication between display devices, then device portability and flexibility are improved, but synchronization accuracy deteriorates due to latency
Solution Approach 1:
The master display device transmits a reference signal to slave devices before actual touch information exchange, enabling each device to measure its individual latency in advance. This preliminary measurement allows the system to compensate for wireless transmission delays during subsequent touch synchronization operations.
Solution Approach 2:
Slave devices transmit ACK signals back to the master device in response to received reference signals. The master device uses this feedback to calculate latency values for each slave device, enabling dynamic compensation and synchronization adjustment based on actual measured transmission times.
2Measurement precision
If latency measurement and compensation mechanisms are implemented, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
A reference signal acts as an intermediary between the master and slave devices, enabling indirect measurement of transmission latency. This intermediary signal facilitates synchronization without requiring complex direct measurement mechanisms between all device pairs.
Solution Approach 2:
The system dynamically adjusts timing parameters for touch information display based on measured latency values. By changing the display timing parameter according to the calculated latency, the system achieves synchronization without requiring complex structural modifications to the display devices.
Data Source
AI summary
A tiled display device includes a first display device including a first display panel configured to sense a touch thereon and display an image signal, and a first controller configured to control the first display panel and transmit a reference signal wirelessly, and a second display device including a second display panel configured to sense a touch thereon and display the image signal, and a second controller configured to control the second display panel and transmit a first ACK signal to the first controller after receiving the reference signal, in which the first controller is configured to determine a first latency time of the second display device by using the reference signal and the first ACK signal and synchronize touch information of the first and second display devices according to the first latency time.