OLED Short Circuit Detection via Closed-Loop Pulse Comparison
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Solution Overview
Problem
Organic light emitting displays are prone to short circuits during manufacturing or module processes, leading to overcurrent flow, heat generation, and potential fires due to internal structural issues like particles, cracks, misalignment, and external causes like static electricity.
Innovation Solution
A short circuit detection system using a timing controller that forms a closed loop with a signal line, transmits input pulses, receives output pulses, and compares them to determine if a short circuit is present, thereby controlling the power supply to prevent overheating and fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high current is supplied to the organic light emitting display panel, then luminance is improved, but the risk of short circuit and overheating increases
Solution Approach 1:
The patent applies preliminary action by performing short circuit detection before the display panel is powered on. The detection circuit tests signal lines for shorts in advance, and only allows power supply after confirming no short circuit exists. This prevents the contradiction from manifesting during operation by eliminating the risk condition beforehand.
Solution Approach 2:
The patent implements feedback through a detection circuit that continuously monitors signal lines for short circuits. When a short is detected, the system provides feedback to prevent power supply or shuts off power immediately, creating a closed-loop safety mechanism that resolves the reliability concern while allowing high current operation when safe.
2Duration of action of moving object
If continuous power supply is maintained, then display operation is improved, but heat accumulation and fire risk increase
Solution Approach 1:
The system performs preliminary short circuit detection before enabling continuous power supply. By checking for shorts in advance and only permitting operation when safe, the system enables continuous display operation without the heat accumulation risk that would otherwise prevent it.
Solution Approach 2:
The detection circuit performs preliminary anti-action by identifying short circuit conditions before they can cause harmful heat accumulation. The system actively prevents the dangerous condition from developing, allowing continuous operation to proceed safely.
3Reliability
If comprehensive short circuit detection is implemented, then safety is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary detection circuit that mediates between the power supply and display panel. This separate testing system checks for shorts without being part of the main display operation, providing comprehensive safety while adding minimal complexity through a dedicated testing subsystem.
Solution Approach 2:
The detection system is segmented into separate testing circuits for different signal lines (data lines, gate lines, power lines). This modular approach provides comprehensive coverage while keeping each detection module simple and manageable, reducing overall system complexity.
Data Source
AI summary
An organic light emitting display and method for driving the same are discussed. The organic light emitting display according to an embodiment includes a panel, drivers, and a short circuit detector. The short circuit detector forms a closed loop with a signal line, transmits input pulses through one end of the signal line and receives output pulses fed back through the other end of the signal line compares the input pulses and the output pulses.