Power Management Circuit Using Blanking Detection to Cut Display Idle Power
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Solution Overview
Problem
Display devices consume power continuously due to PMICs generating switching signals even when the display panels are not in use, leading to unnecessary power consumption.
Innovation Solution
A power management circuit with a control circuit and a blanking detecting circuit that detects the disable state of clock signals to turn off the power conversion operation of the power converter circuit during non-display periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PMIC continuously generates switching signals to ensure power supply readiness, then the power supply reliability is improved, but the power consumption increases unnecessarily during non-display periods
Solution Approach 1:
The patent implements periodic action by using the blanking detecting circuit to monitor clock signals and periodically activate or deactivate the control circuit based on display activity. During active display periods, the control circuit operates normally; during blanking periods when clock signals are disabled, the control circuit is turned off. This periodic activation/deactivation aligns power consumption with actual display needs while maintaining power supply reliability when required.
2Productivity
If the control circuit operates continuously to maintain power conversion, then the power conversion availability is improved, but the energy waste increases during blanking periods
Solution Approach 1:
The patent applies self-service by enabling the control circuit to automatically detect the operational state of the display through the blanking detecting circuit monitoring clock signals. The control circuit self-regulates its operation based on detected blanking periods, turning itself off during non-display periods without requiring external intervention. This eliminates energy waste during blanking periods while ensuring power conversion availability is restored automatically when display activity resumes.
Data Source
AI summary
A power management circuit including a control circuit and a blanking detecting circuit is provided. The control circuit is configured to output a control signal to control a power conversion operation of a power converter circuit. The blanking detecting circuit is coupled to the control circuit. The blanking detecting circuit is configured to receive a plurality of clock signals, detect a disable state of the clock signals, and turn off the control circuit when the disable state of the clock signals is detected.