LED Display Control Card Data Return Circuit Fault Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LED display screen systems in traffic applications face challenges with complex connections and high costs due to the need for excessive connection cables and an additional monitoring board for fault detection, which can lead to incorrect message display when a significant number of LEDs fail.
Innovation Solution
The implementation of a data return circuit on the LED display unit board and control card simplifies connections by eliminating the need for an additional monitoring board, allowing for fault detection through a circuit loop without additional hardware, using a data return circuit integrated with the LED display unit board and control card.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a monitoring board is added to detect LED faults, then fault detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the monitoring function into the existing control card by integrating a data return circuit. The control card now handles both display control and fault detection functions, eliminating the need for a separate monitoring board. The data return circuit receives return data from LED display unit boards and transmits fault information to the control card, which analyzes the data to detect LED faults.
Solution Approach 2:
The control card is designed to perform multiple functions: it controls the LED display unit boards for normal operation and simultaneously detects faults through the data return circuit. The input-output interface is configured to both send control signals and receive return data, making the control card a universal component that handles both display control and monitoring tasks.
2Reliability
If excessive connection cables are used for fault detection, then fault detection coverage is improved, but ease of operation deteriorates
Solution Approach 1:
The patent combines the fault detection connections with the existing display control connections. The data return circuit uses the same input-output interface that already connects the control card to the LED display unit boards. This merging approach allows fault detection without adding excessive connection cables, as the return data travels through the existing communication pathway between the control card and display units.
Data Source
AI summary
The present invention provides a LED display unit board, a LED display screen control card and a LED display screen system. In the LED display screen control card, an output circuit transmits data and control signals to an input-output interface to drive and control a LED display unit board(s); a data return circuit transmits return data generated from the LED display unit board(s) which represents a test result of the LED display unit board(s) to a main control circuit. The present invention disposes the data return circuit on the control card which can be used together with the LED display unit board(s) each having a data return circuit. Therefore there is no need of an additional monitoring board for building a circuit loop to perform fault detection of the LED display unit board(s), simplified connection and lower cost can be achieved.