Leakage Estimation Circuit for Display Panel Short Circuit Detection
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Solution Overview
Problem
Display panels can suffer from undetectable short circuits due to tiny cracks, which may lead to burnout, and existing methods lack effective detection mechanisms for identifying such issues.
Innovation Solution
A display device equipped with a leakage estimation circuit that includes a mode-switch, defect detection circuit, and evaluation circuit, which performs a leakage estimation procedure to determine abnormal leakage currents indicative of short circuits, triggering a warning and potential shutdown to prevent burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display panel is used without a detection mechanism, then the device complexity is reduced, but the reliability deteriorates due to undetectable short circuits leading to burnout
Solution Approach 1:
The leakage estimation circuit is integrated into the existing source control circuit, sharing common components such as source drivers and circuit pathways. The mode-switch enables the same circuit infrastructure to serve both normal display operations and leakage detection functions, merging detection capabilities into the existing control architecture without adding completely separate detection hardware.
Solution Approach 2:
The source control circuit is designed to perform multiple functions: it controls data voltages for pixel display during normal operation and simultaneously performs leakage current estimation when the mode-switch is activated. The defect detection circuit within the source control circuit can operate in both display mode and detection mode, making the circuit universal and multi-functional.
2Measurement precision
If the display panel is divided into multiple panel-partitions for detection, then the measurement precision is improved, but the device complexity increases due to additional mode-switches and detection circuits
Solution Approach 1:
The display panel is divided into multiple panel-partitions, with each partition having its own mode-switch and defect detection circuit. This segmentation allows independent leakage current estimation for each partition, improving measurement precision by localizing detection to specific regions where cracks or breaks may occur, rather than detecting the entire panel as a single unit.
Solution Approach 2:
Instead of requiring complete coverage of the entire display panel with detection circuits, the system performs partial detection by dividing the panel into partitions and using mode-switches to selectively activate detection for specific partitions. This partial action approach achieves sufficient detection precision for practical purposes while avoiding the excessive complexity of comprehensive full-panel detection.
Data Source
AI summary
A display device and a detection method applied to the display device are provided. The display device includes a display panel, a source control circuit, and a leakage estimation circuit. The display panel includes pixels being arranged in M columns, wherein at least one panel-partition is defined on the display panel. The source control circuit includes M source drivers which respectively provide data voltages to the M columns of pixels. The leakage estimation circuit includes an evaluation circuit, a defect detection circuit, and a mode-switch. The evaluation circuit controls the defect detection circuit to perform a leakage estimation procedure so that a leakage current corresponding to the panel-partition is estimated when the at least one mode-switch is turned on.