Dummy Pixel Circuit Repair for OLED Bright Spots
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Solution Overview
Problem
In organic light-emitting display apparatuses, defective pixels often result in bright or dark spots due to circuit defects, which are difficult to prevent or solve as the circuit complexity increases, leading to display issues.
Innovation Solution
The implementation of a redundancy pattern in each column of pixels, where a dummy pixel circuit supplies driving current to defective emission devices through a repair line, allowing for isolation and correction of defective sub-emission devices using laser-cut connections and insulating layers, ensuring normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If circuit complexity in pixel is increased to improve display functionality, then display features are enhanced, but defect occurrence rate increases leading to more bright spots and dark spots
Solution Approach 1:
The patent applies preliminary action by pre-configuring redundancy patterns (dummy pixel circuits and repair lines) during the manufacturing stage before defects occur. This allows defective pixels to be redirected to functional redundant circuits through laser cutting, preventing defect manifestation without requiring complex real-time detection or adjustment mechanisms.
Solution Approach 2:
The patent changes the electrical connection parameter by selectively cutting repair lines to isolate defective pixels from the main circuit. By altering the connectivity state (connected vs. cut), the system dynamically reconfigures current paths to bypass defects while maintaining normal display operation, thus improving reliability without reducing functionality.
2Reliability
If redundancy patterns are added to each column to repair defective pixels, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the pixel circuit into functional components (emission device, pixel circuit, dummy pixel circuit, repair line) that can be independently configured and activated. This modular segmentation allows the redundancy mechanism to be added as a separate subsystem rather than integrating complexity into the base pixel circuit, thus improving reliability with minimal impact on original circuit design.
Solution Approach 2:
The repair line acts as an intermediary element that connects the emission device to both the pixel circuit and dummy pixel circuit. This intermediary structure enables flexible routing of driving current through different paths depending on pixel health status, providing defect correction capability without requiring direct modification of the core emission device or pixel circuit architecture.
3Manufacturing precision
If laser cutting is used to isolate defective sub-emission devices, then manufacturing precision is improved for defect isolation, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces complex mechanical defect isolation methods with laser-based cutting technology. The laser cutting process provides precise, non-contact separation of defective components through material ablation, achieving high isolation accuracy without requiring complex mechanical positioning or physical manipulation systems that would increase manufacturing process complexity.
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 method effectively suppresses or reduces the occurrence of bright or dark spots by providing a redundant current path, improving the reliability and yield of the display panel by isolating and correcting defective pixels.
Implementation Method 1
the first repair connection wiring is configured to be coupled to the first short wiring utilizing a laser beam
Data Source
AI summary
Provided is an organic light-emitting display apparatus and a method of repairing the same. The organic light-emitting display apparatus includes: an emission device comprising a plurality of sub-emission devices; an emission pixel circuit configured to supply a driving current to the emission device; a dummy pixel circuit configured to supply the driving current to the emission device; and a repair line coupling the emission device to the dummy pixel circuit, wherein the emission device is configured to receive the driving current from the emission pixel circuit or the dummy pixel circuit.