Power Management Driver for Display Device Short-Circuit Fault Detection
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Solution Overview
Problem
Display devices with power management drivers face challenges in detecting short-circuit faults in power lines, which can lead to overcurrent issues, heat generation, and potential fires due to unintended contacts or panel deformations.
Innovation Solution
A power management driver that senses the voltage of driving power terminals during a sensing period to detect short-circuit faults in the power line, utilizing a controller to manage the timing of voltage outputs and a fault detector to identify faults based on current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is continuously supplied to the driving power terminal, then the display device can operate without interruption, but short-circuit faults in the power line cannot be detected timely
Solution Approach 1:
The power management driver periodically switches between display period and sensing period. During the sensing period, voltage is supplied to enable fault detection. This periodic action allows the system to detect short-circuit faults while maintaining continuous operational capability through alternating display and sensing cycles.
Solution Approach 2:
The fault detector performs preliminary detection of short-circuit faults during the sensing period before any damage occurs. By sensing the voltage and detecting current anomalies in advance, the system can prevent overcurrent issues and heat generation before they become critical problems.
2Reliability
If a sensing period is introduced to detect voltage and current, then short-circuit faults can be detected, but the display operation time is reduced
Solution Approach 1:
The system uses periodic switching between display and sensing periods. The sensing period is briefly inserted to enable fault detection, then the display period resumes. This periodic structure ensures reliability through regular checks while minimizing impact on overall display productivity.
Solution Approach 2:
The display operation continues uninterrupted in the display period. The sensing period is a brief interruption specifically for fault detection, after which display operations resume. This maintains the continuity of the main useful action (display) while periodically ensuring safety through sensing.
3Device complexity
If voltage switching timing is not controlled during transition period, then the circuit structure is simple, but simultaneous voltage output causes overcurrent
Solution Approach 1:
The controller performs preliminary timing control during the transition period. By pre-establishing the sequence in which voltage is switched on and off, the system prevents simultaneous voltage output that would cause overcurrent. This preliminary timing arrangement avoids harmful effects before they occur.
Solution Approach 2:
The controller acts as an intermediary that manages the timing between first voltage output and second voltage output. It introduces controlled delays and sequencing to ensure voltages are not output simultaneously, thereby preventing overcurrent while maintaining simple circuit structure.
Data Source
AI summary
A power management driver and a display device having the power management driver are provided, including a first power supply configured to supply a first voltage to a first driving power terminal of a pixel through a power line during a sensing period, and supply a second voltage to the first driving power terminal of the pixel through the power line during a display period; a controller configured to control timing at which the first voltage is output and timing at which the second voltage is output during a transition period between the display period and the sensing period in response to a sensing control signal; and a fault detector configured to detect a fault in the power line based on a current flowing through an output terminal during the sensing period.