OLED Display Pixel Repair via Closed-Loop Laser Welding
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Solution Overview
Problem
Existing organic light emitting diode (OLED) displays face challenges in efficiently repairing defective pixels, which can lead to reduced display performance and lifespan due to the complexity of disconnecting and reconnecting the organic light emitting diode from its pixel circuit.
Innovation Solution
The OLED display incorporates a repair line and dummy pixel circuit connected via a closed-loop welding part, allowing for selective disconnection of the organic light emitting diode from the defective pixel circuit and reconnection to a functioning dummy pixel circuit using laser welding, enabling easy repair and bypassing of defective components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a repair line is added to enable pixel repair functionality, then the ease of repair is improved, but the device complexity increases due to additional wiring and control mechanisms
Solution Approach 1:
The display panel is segmented into functional regions including emission pixels, dummy pixels, and repair lines. The repair line is divided into multiple segments with welding parts at specific locations, allowing selective connection to different pixel circuits. This segmentation enables independent repair operations without affecting the entire display structure.
Solution Approach 2:
The repair line acts as an intermediary component between defective pixels and dummy pixels. By introducing this intermediate connection path with welding parts, the system enables pixel repair functionality without directly modifying the original pixel circuit structure, thus reducing overall device complexity while maintaining ease of repair.
2Manufacturing precision
If laser welding is used to connect the repair line to the connection line, then the manufacturing precision is improved, but the use of energy increases due to laser beam requirements
Solution Approach 1:
The welding part is designed with localized material properties that differ from the surrounding conductive lines. The welding part has specific material composition and geometric features that concentrate laser energy at the welding location, enabling precise welding with reduced overall energy consumption. This local quality enhancement allows accurate alignment and welding without requiring high energy across the entire repair line.
3Reliability
If dummy pixels are added to provide replacement circuits, then the reliability is improved, but the area occupied by the display increases
Solution Approach 1:
The dummy pixels are designed with universal circuit structures that can serve multiple purposes: they function as replacement pixels for defective areas and can also serve as additional display pixels. This multi-functionality allows the same structural elements to provide both repair capability and display area, reducing the overall area increase while maintaining reliability.
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 solution allows for efficient and effective repair of defective pixels by disconnecting the OLED from the defective pixel circuit and reconnecting it to a functioning dummy pixel circuit, thereby maintaining display performance and extending the OLED's lifespan.
Implementation Method 1
the first welding part may directly connect between the first connection line and the repair line in response to laser welding of the first welding part
Implementation Method 2
the first welding part may directly connect between the first connection line and the repair line in response to laser welding of the first welding part
Implementation Method 3
a plurality of emission pixels that include the organic light emitting diode
Data Source
AI summary
An organic light emitting diode display including a first connection line connected to an organic light emitting diode; a repair line intersecting the first connection line, the repair line being insulated from the first connection line; and a first welding part that is integrally formed with the first connection line or the repair line, the first welding part being aligned with an intersecting portion of the repair line and the first connecting line, and having a closed loop shape in plan view.