Display Panel Repair Circuit for Defective Pixel Restoration
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Solution Overview
Problem
Existing display panels face challenges in effectively repairing defective pixels, leading to reduced yield and reliability.
Innovation Solution
Incorporation of a repair circuit and repair line in the non-display area of the display panel, connected to defective pixels through a silicon and oxide transistor structure, allowing for electrical connection and restoration of pixel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair circuit and repair line are incorporated to restore defective pixels, then reliability and yield of the repair process improve, but device complexity increases
Solution Approach 1:
The patent introduces a repair circuit and repair line as intermediary components that mediate between the power supply and defective pixels. The repair circuit includes a repair transistor that acts as a switch to control the repair line, which provides an alternative electrical path to restore power to defective pixels. This intermediary structure enables reliable repair while managing complexity through modular design.
Solution Approach 2:
The repair system is segmented into distinct functional components: a repair circuit with repair transistors, repair lines extending to pixel regions, and integration with existing pixel circuits. This segmentation allows the repair functionality to be added independently without redesigning the entire display panel, thus improving reliability while controlling overall device complexity.
2Reliability
If repair circuits are disposed in the non-display area, then pixel functionality restoration is enabled, but the area of the non-display area is reduced
Solution Approach 1:
The repair circuit is merged with the existing pixel circuit structure by sharing common elements such as the light emitting element and integrating repair transistors within the pixel circuit architecture. The repair line is merged with existing signal lines where possible. This merging allows repair functionality to be implemented while minimizing the additional area required in the non-display region.
Solution Approach 2:
The repair line extends from the non-display area through the display area to reach defective pixels, utilizing the vertical and horizontal dimensions of the panel structure. By routing the repair line through available spaces between pixel rows and columns, the design minimizes the footprint in the non-display area while maintaining full functionality.
Data Source
AI summary
A display panel includes a base layer including a display area and a non-display area, a repair circuit disposed in the non-display area, a pixel disposed in the display area and including a pixel circuit and a light emitting element electrically connected to the pixel circuit, and a repair line electrically connecting the repair circuit to the pixel. The pixel circuit includes a silicon transistor including a silicon semiconductor pattern and a first gate disposed on the silicon semiconductor pattern, an oxide transistor including a light shielding pattern disposed on the first gate and disposed on the same layer as the repair line, an oxide semiconductor pattern disposed on the light shielding pattern, and a second gate disposed on the oxide semiconductor pattern, and a bridge electrode electrically connected to the light emitting element and the silicon transistor.