Display Module Daisy-Chain Control for End-Point EMI Reduction
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Solution Overview
Problem
In modular display apparatuses, noise exceeds threshold values due to signal output from display modules at end points, particularly as the number of modules increases, necessitating an efficient method for controlling signal output.
Innovation Solution
A display module with a communication interface and driver integrated circuits (ICs) that manage signal distribution through a daisy chain method, identifying and controlling the output of signals based on connection information and a driving protocol to prevent excessive noise by ensuring modules at end points do not transmit signals externally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of display modules is increased to achieve larger display size and higher resolution, then the display capability is improved, but the noise from signal output at end points significantly exceeds the threshold value
Solution Approach 1:
The patent applies local quality by differentiating the behavior of display modules based on their position in the daisy chain. End-point modules (identified by receiving a specific shutdown signal) are configured to suppress signal output, while intermediate modules continue normal operation. This localized differentiation resolves the contradiction by eliminating noise from specific locations (end points) without affecting the overall display capability of the system.
2Object-generated harmful factors
If signal output is controlled at end point modules to reduce noise, then electromagnetic interference is reduced, but the complexity of signal control increases
Solution Approach 1:
The patent introduces a shutdown signal as an intermediary mechanism to control end-point module behavior. This single-bit signal transmitted through the daisy chain enables sophisticated noise control without requiring complex logic at each module. The intermediary signal simplifies the control architecture by providing a unified method for all modules to determine their operational state, resolving the contradiction between noise reduction and control complexity.
3Adaptability or versatility
If all display modules output signals independently, then each module functions autonomously, but the cumulative noise from multiple modules exceeds acceptable thresholds
Solution Approach 1:
The patent implements feedback through the shutdown signal mechanism. Each module monitors the shutdown signal received from previous modules in the daisy chain to determine whether to suppress its own signal output. This feedback loop enables modules to adapt their behavior based on system state, maintaining autonomy while coordinating noise reduction across the entire display wall, thus resolving the contradiction between independent module function and cumulative noise control.
Data Source
AI summary
Provided is a display module including a communication interface; and a plurality of driver integrated circuits (ICs), wherein a first driver IC among the plurality of driver ICs is configured to: based on obtaining a driving signal from an external device through the communication interface, provide the driving signal to a second driver IC adjacent to the first driver IC so that the driving signal is sequentially provided to remaining driver ICs among the plurality of driver ICs, and provide, to a second display module among the plurality of display modules, the driving signal based on module connection information including whether the second display module is connected to any one display module among the plurality of display modules by a daisy chain method.