Display Crack Detection via Multi-Frame Current Averaging
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Solution Overview
Problem
Display devices face challenges in reliably detecting cracks, which can lead to short circuits and potential fires due to overcurrent issues, as existing systems are prone to errors from momentary or short-duration overcurrents caused by external or driving environmental factors.
Innovation Solution
A display device with a crack detector that senses currents through power lines during both non-emission and emission periods, calculates average current values over successive frame periods, and generates a crack signal when deviations exceed threshold values, allowing for the adjustment of reference values based on temperature and pixel deterioration to improve detection reliability and prevent power transmission in case of a crack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current sensing is performed during both non-emission and emission periods with averaging over multiple frame periods, then crack detection reliability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary current sensing during non-emission periods before actual emission, storing these values for later comparison. This preliminary measurement allows the system to establish a baseline current state without the interference of emission-related current variations, improving detection reliability while maintaining manageable complexity through structured data collection
Solution Approach 2:
The system continuously monitors current deviations from reference values and provides feedback through crack detection signals. By comparing sensed currents against stored reference values and triggering alerts when thresholds are exceeded, the system creates a closed-loop feedback mechanism that enhances reliability without requiring overly complex hardware
2Measurement precision
If current threshold values are adjusted based on temperature and pixel deterioration, then detection accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The system automatically adjusts current reference values based on temperature sensor readings and pixel deterioration data without requiring manual intervention. The controller autonomously modifies threshold parameters according to environmental conditions and device aging, improving measurement accuracy while eliminating the need for operators to manually calibrate settings
Solution Approach 2:
The patent replaces manual mechanical adjustment of threshold values with automated electronic control. Instead of requiring physical manipulation of potentiometers or manual input of parameter values, the system uses electronic sensors and controllers to automatically adapt thresholds based on temperature and pixel state, improving precision while simplifying operation
3Object-affected harmful factors
If power transmission is stopped in response to crack signals, then safety against fires is improved, but productivity decreases
Solution Approach 1:
The system takes preliminary anti-action by continuously monitoring current deviations and stopping power transmission before a crack can lead to fire or further damage. By detecting abnormal current patterns early and cutting power proactively, the system prevents harmful effects from developing while maintaining normal operation during legitimate display activities
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a power supply transmitting driving power to the pixels via a power line and stopping transmission of the driving power in response to a crack signal, a panel driver provides a driving signal to the pixels, the driving signal for displaying a black image during a non-emission period of each frame period and displaying a valid image during an emission period of each frame period, and a crack detector senses a current flowing through the power line and conditionally generate the crack signal according to values of the current sensed over M successive frame periods, where M is an integer greater than 1.