Display Substrate Repair Lines for Dark and Bright Pixel Defects
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Solution Overview
Problem
Existing OLED display substrates face issues with dark and bright pixel defects due to foreign matter or device abnormalities, leading to poor display quality, especially in transparent products, where resolution is compromised and defects are difficult to repair.
Innovation Solution
A display substrate design with second power lines and repair lines that couple to defective pixels, using a higher potential signal to fuse foreign matter and decouple abnormal devices, allowing normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If repair lines and second power lines are added to repair defective pixels, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
The repair lines and second power lines are pre-configured in the display substrate before defects occur. This preliminary arrangement of repair infrastructure allows defective pixels to be repaired by simply activating the appropriate repair line without requiring additional structural modifications or complex repair procedures.
Solution Approach 2:
The repair line acts as an intermediary conductive path that connects the second power line to the first electrode of defective pixels. This intermediary structure enables the high potential signal to reach defective pixels without requiring direct modification of the original power line architecture, thus simplifying the repair mechanism while managing complexity.
2Reliability
If a higher potential signal is applied to fuse foreign matter, then the reliability of defect removal is improved, but the risk of damaging normal devices increases
Solution Approach 1:
The high potential signal is applied locally only to defective pixels through the repair line, rather than uniformly across the entire display substrate. This localized application allows the high potential to effectively fuse foreign matter in defective pixels while the normal pixels continue to operate with their standard power signals, avoiding damage to healthy devices.
Solution Approach 2:
The repair line serves as an intermediary that isolates the high potential signal to only those pixels that require repair. This intermediary structure prevents the high potential from affecting normal pixels, thus enabling reliable defect removal while minimizing harmful effects on the overall system.
3Ease of repair
If repair lines are configured to overlap with the first electrode projection, then the repair effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The repair line is designed to overlap with the projection of the first electrode, allowing a single repair line structure to serve multiple defective pixels within its overlap region. This universal design approach improves repair effectiveness by enabling one repair line to address multiple defects, while the overlap configuration provides a larger tolerance margin for manufacturing variations compared to precise point-to-point alignment.
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
Effectively repairs dark and bright pixel defects by reliably addressing foreign matter and device abnormalities, improving display quality and maintaining resolution without sacrificing transparency.
Implementation Method 1
a potential of the second power signal is greater than a potential of the first power signal... using a higher potential signal to fuse foreign matter
Data Source
AI summary
Provided is a display substrate, including: a substrate; a plurality of pixels disposed on a side of the substrate, each of the pixels including a pixel circuit and a light-emitting element; and at least one second power line and a plurality of repair lines that are disposed on a side of the substrate. The pixel circuit is configured to transmit a drive signal to the first electrode of the light-emitting element, and the light-emitting element is configured to emit light based on the drive signal and a first power signal supplied by the first power line. The second power line is coupled to the repair line. The second power line is configured to transmit a second power signal to the first electrode of the coupled light-emitting element by the repair line. A potential of the second power signal is greater than a potential of the first power signal.