OLED Panel Defect Detection Using Integrated Sensing Lines
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Solution Overview
Problem
Existing display apparatuses face issues with short circuits and degradation of driving transistors and organic light-emitting diodes due to cracks or overheating, leading to overcurrents and potential panel damage, necessitating complex detection circuits.
Innovation Solution
A display apparatus that omits detection circuits for short circuits by using a sensing circuit to determine defects in driving transistors and organic light-emitting diodes based on pre-stored reference data, updated in real-time during display driving, and a controller to analyze voltage waveforms for defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate detection circuits are added to detect short circuits of driving transistors and OLEDs, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the detection of driving transistor defects and OLED short circuits into a single integrated sensing process. The sensing circuit uses voltage waveform analysis during the off-sensing period to simultaneously detect both types of defects, eliminating the need for separate detection circuits while maintaining comprehensive defect detection capability.
Solution Approach 2:
The sensing circuit is designed to perform multiple functions: it detects both driving transistor defects and OLED short circuits using the same hardware infrastructure. The controller analyzes voltage waveforms from the sensing lines to identify different defect types, making the sensing system universal rather than specialized for a single defect type.
2Measurement precision
If multiple separate detection processes are used for driving transistor and OLED defects, then detection precision is improved, but loss of time increases
Solution Approach 1:
The patent merges the detection processes for driving transistor defects and OLED short circuits into a single integrated process that occurs during the off-sensing period. Both defect types are detected simultaneously through voltage waveform analysis, eliminating the time loss associated with sequential detection while maintaining the precision needed to distinguish between different defect types.
Solution Approach 2:
The sensing process is performed during the off-sensing period, which occurs before the next display frame is rendered. This preliminary detection allows defects to be identified in advance, enabling timely compensation or correction without delaying the actual display output, thus maintaining detection precision while minimizing time loss.
3Ease of operation
If detection is performed after the off-sensing process, then ease of operation is improved, but reliability of defect detection worsens
Solution Approach 1:
The patent performs defect detection during the off-sensing period, which occurs before the next display frame is rendered. This timing allows the sensing circuit to measure voltage waveforms without interference from active display operations, ensuring reliable defect detection. The controller then uses this detection information to adjust compensation values or correct defects before they affect display quality, maintaining both ease of operation and detection reliability.
Data Source
AI summary
The present disclosure relates to a display apparatus, and the display apparatus includes a display panel on which a plurality of sub-pixels are arranged, the plurality of sub-pixels each including an organic light-emitting diode and a driving transistor for driving the organic light-emitting diode, a plurality of sensing lines disposed on the display panel, a sensing circuit configured to sense voltages of the plurality of sensing lines, and a controller configured to determine whether the organic light-emitting diode is defective based on pre-stored reference data, wherein a process for determining whether the organic light-emitting diode is defective is performed before an off-sensing process after a power-off signal is generated.