OLED Panel Defect Detection via Sensing Subpixel Lines
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in accurately and rapidly detecting panel defects without a separate circuit or component, which can lead to malfunction or burnout of the display panel.
Innovation Solution
The method involves a sensing unit that senses voltage on a sensing line connected to a driving transistor in each subpixel, outputting sensing values to detect panel defects by compensating for subpixel characteristic values, primarily focusing on regions with high probability of defects, and intensively sensing these areas to improve detection accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate circuit and component are used for panel defect detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The sensing line is designed to serve dual purposes: it functions as a data line during normal display operation and as a sensing line for defect detection when voltage is applied to the OLED. This multi-functionality eliminates the need for separate dedicated sensing circuits, reducing device complexity while maintaining detection capability
Solution Approach 2:
The OLED itself serves as the sensing element by utilizing its light-emitting properties. When voltage is applied, the OLED emits light that can be detected to identify defects, eliminating the need for external sensing components and simplifying the overall device structure
2Measurement precision
If sensing is performed on all subpixel lines, then detection accuracy is improved, but detection time increases
Solution Approach 1:
Instead of uniformly sensing all subpixel lines, the method selectively senses specific sensing subpixel lines that are strategically positioned to detect defects in different regions of the display panel. This localized sensing approach maintains detection accuracy while significantly reducing the time required compared to sensing all lines
Solution Approach 2:
The display panel is divided into multiple regions, and sensing subpixel lines are distributed across these regions. By sensing a predetermined number of lines from different regions rather than all lines, the method achieves comprehensive defect detection coverage with reduced sensing time
3Productivity
If sensing is performed on fewer subpixel lines, then detection speed is improved, but detection accuracy deteriorates
Solution Approach 1:
Sensing subpixel lines are pre-selected and positioned in regions where defects are most likely to occur or where defects would have the greatest impact. This preliminary selection ensures that sensing a limited number of lines still provides high detection accuracy by focusing on critical areas
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient detection of panel defects without additional circuits, enhancing accuracy and speed, thereby preventing panel burnout and facilitating easier repair by identifying defect locations.
Implementation Method 1
each subpixel including an organic light-emitting diode (OLED)... a sensing unit sensing a voltage on a sensing line
Data Source
AI summary
A panel defect detection method and an organic light emitting display device. A region having a high probability of a panel defect is intensively sensed through panel defect detection based on sensing results of characteristic values according to subpixels on sensing subpixel lines in an amount equal to the number of sensing subpixel lines preset in specific regions rather than all regions of a display panel. Rates and accuracy in detection of panel defects can be improved.