Display Power Activation Timing for Multi-Panel EMI Reduction
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Solution Overview
Problem
Display devices experience electromagnetic interference (EMI) due to peak currents generated when signals are transmitted to multiple display panels, which does not comply with tightening EMI regulations for home appliances and communication devices.
Innovation Solution
Incorporation of a first and second power circuit with sensing circuits and a power control circuit to sense currents and increase time intervals between power activation signals when currents exceed a threshold, thereby reducing EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power is supplied simultaneously to multiple display panels, then productivity and display functionality are improved, but electromagnetic interference increases due to peak currents
Solution Approach 1:
The patent applies periodic action by sequentially activating power to multiple display panels rather than simultaneously. The power control circuit divides the power activation into distinct time intervals, creating a periodic pattern of power delivery that eliminates peak current overlap and reduces electromagnetic interference while maintaining multi-display functionality.
Solution Approach 2:
The patent implements preliminary action by sensing the current draw of each display panel before activating power. The power control circuit预先 determines the power requirements and schedules activation sequences in advance, ensuring that panels are powered in an optimized sequence that prevents EMI while maintaining productivity.
2Ease of operation
If power activation signals are transmitted simultaneously to multiple power circuits, then ease of operation is improved, but electromagnetic interference is generated due to peak current
Solution Approach 1:
The patent employs feedback by using sensing circuits to monitor the current draw of each display panel and using this information to control the power activation sequence. The power control circuit receives feedback from the sensing circuits and adjusts the timing of power activation signals accordingly, creating a closed-loop system that eliminates EMI while maintaining ease of operation.
Solution Approach 2:
The patent applies dynamics by making the power activation timing adaptive rather than fixed. The power control circuit dynamically adjusts the activation sequence based on real-time current sensing data, optimizing the power delivery timing to prevent peak current overlap and reduce electromagnetic interference while maintaining operational simplicity.
3Object-affected harmful factors
If current sensing and power interval control are implemented, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent implements universality by designing the power control circuit to perform multiple functions: it senses current, determines power requirements, schedules activation sequences, and controls power delivery all in one integrated unit. This multi-functional approach reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving EMI reduction.
Solution Approach 2:
The patent applies merging by combining the sensing circuits and power control circuit into an integrated power management system. Rather than having separate independent circuits for sensing and control, the patent merges these functions into a coordinated system that works together to reduce EMI, thereby minimizing the overall complexity increase.
Data Source
AI summary
The present disclosure relates to a display driving device, a display device, and a display driving method. The display driving device may include a control circuit configured to control a driving circuit configured to drive pixels of a display panel, a power circuit configured to supply power to the driving circuit and the control circuit in response to an input voltage, a sensing circuit configured to sense a peak current on a power path through which the input voltage is applied, and a power control circuit configured to increase time intervals between power activation signals input to the power circuit. Therefore, it is possible to reduce electro-magnetic interference (EMI) and minimize an increase in noise caused to overlapping noises.