OLED Display Pixel Repair Layout for Defective Pixel Rerouting
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Solution Overview
Problem
Defective pixel circuits in OLED displays result in display defects, affecting the display effect due to incorrect brightness, which existing technologies have not effectively addressed.
Innovation Solution
A display panel design with repair connection lines and driving circuits, including an adapting structure that overlaps with repair data lines, allowing for the rerouting of defective pixels to functional repair driving circuits, and the use of multiple repair data lines to enhance fault tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pixel circuits are used in OLED displays, then the display structure is simple and manufacturing is easier, but defective pixels cause display defects and cannot be repaired
Solution Approach 1:
The patent segments the pixel circuit into two independent pathways: a normal pixel circuit for regular operation and a repair pixel circuit for defective pixels. This segmentation allows the normal circuit to function without interference while providing a dedicated repair pathway, resolving the contradiction by maintaining simple normal operation while enabling repair capability.
Solution Approach 2:
The patent implements preliminary action by pre-configuring repair connection lines and repair driving circuits before defects occur. The repair infrastructure is built in advance during manufacturing, allowing defective pixels to be redirected to repair circuits without requiring additional manufacturing steps or complex real-time decision-making.
2Reliability
If repair connection lines are added to enable pixel repair, then fault tolerance improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the repair connection lines with existing pixel circuit structures, allowing repair functionality to be integrated into the standard manufacturing process. The repair circuits share common elements with normal pixel circuits, such as using the same active layer and overlapping structures, which reduces manufacturing complexity compared to completely separate repair systems.
Solution Approach 2:
The repair driving circuits are designed to be universal, capable of driving both normal and defective pixels through the same connection lines. This multi-functionality reduces the need for dedicated repair-only infrastructure, simplifying manufacturing while maintaining high fault tolerance.
3Reliability
If multiple repair data lines are used to enhance fault tolerance, then more pixels can be repaired simultaneously, but the overlap area and device complexity increase
Solution Approach 1:
The patent utilizes the vertical dimension (thickness direction) by having repair connection lines overlap with pixel driving circuit rows in the vertical direction rather than requiring lateral separation. This dimensional approach allows multiple repair data lines to be packed more efficiently, reducing the horizontal overlap area while maintaining the ability to repair multiple pixels simultaneously.
Solution Approach 2:
The patent uses copying by having multiple repair data lines that are identical in function and can be interchangeably connected to repair driving circuits. This allows the system to handle multiple defective pixels using replicated repair pathways, enhancing fault tolerance without requiring fundamentally different or more complex structures for each repair line.
Data Source
AI summary
A display panel, a pixel repair method of a display panel and a display device are provided. The display panel includes a plurality of light-emitting elements, a plurality of pixel driving circuit rows, a plurality of repair connection lines, a plurality of repair data lines, a plurality of repair driving circuits, an active layer and a first adapting structure. The plurality of repair driving circuits are arranged along the second direction, and a repair driving circuit is correspondingly provided with at least two repair data lines. In a direction perpendicular to the plane of the substrate of the display panel, the first adapting structure at least partially overlaps the two repair data lines.