OLED Display Panel Fault Detection Using Shared Sensing Lines
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Solution Overview
Problem
Existing display apparatuses face issues with short circuits in driving voltage lines due to cracks or overheating, leading to potential burnout and requiring complex detection mechanisms.
Innovation Solution
A display apparatus with integrated sensing circuits and controllers to detect short circuits in driving voltage lines by comparing sensed voltages with reference values, omitting the need for additional detection components and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional detection components are added to detect short circuits in driving voltage lines, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The sensing line and sensing circuit, originally designed for sensing operations, are made to serve dual purposes: both sensing and short circuit detection. By applying a reference voltage through the sensing line and measuring the voltage at the sensing node, the same hardware components detect both sensing signals and short circuit conditions, eliminating the need for separate detection components.
Solution Approach 2:
The existing sensing circuit performs self-service by utilizing its own operational components (sensing line, sensing circuit, controller) to detect short circuits. The sensing circuit measures voltage changes during its normal operation to identify abnormal conditions, allowing the system to detect faults using its inherent resources without external dedicated detection hardware.
2Measurement precision
If complex detection mechanisms are implemented to detect short circuits, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The sensing line and sensing circuit are designed to perform multiple functions including sensing operations and short circuit detection. This multi-functionality eliminates the need for separate dedicated detection components, reducing manufacturing complexity and cost while maintaining accurate detection capability through voltage measurement during normal sensing operations.
3Reliability
If traditional short circuit detection methods are used, then detection capability is provided, but detection time is excessive
Solution Approach 1:
The sensing circuit continuously monitors voltage levels during normal sensing operations, enabling real-time detection of short circuit conditions. Rather than performing separate detection cycles after potential failures occur, the system continuously measures voltage at the sensing node during its operational phase, immediately detecting abnormalities when they occur.
Solution Approach 2:
The system performs voltage measurement and short circuit detection during the sensing operation itself, before any damage or burnout occurs. By measuring the voltage at the sensing node while applying reference voltage through the sensing line, the system can detect short circuits in advance, enabling preventive action before failures manifest.
Data Source
AI summary
In one or more examples, a display apparatus may include a display panel on which sub-pixels are arranged, each of the sub-pixels including an organic light-emitting diode and a driving transistor for driving the organic light-emitting diode, data lines disposed on the display panel and connected to the sub-pixels, gate lines disposed on the display panel and connected to the sub-pixels, sensing lines disposed on the display panel and connected to the sub-pixels, a data driving circuit configured to supply data voltages to the data lines, a gate driving circuit configured to supply gate voltages to the gate lines, a sensing circuit connected to the sensing lines to sense sensing voltages of the sub-pixels, and a controller configured to determine whether at least one of the driving transistor and the organic light-emitting diode is defective based on a sensing voltage sensed by the sensing circuit.