Segmented Second Electrode for Selective Pixel Repair
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Solution Overview
Problem
Display devices face challenges in minimizing repair risks for defective pixels, particularly dark spots and bright spots, due to the complexity of pixel structures and the need for precise electrode modifications during repair processes.
Innovation Solution
The design of a display device with a second electrode that has varying shapes and configurations, including overlapping parts and openings, allows for independent driving of light emitting elements, enabling minimization of repair risks by allowing selective cutting of defective areas without affecting adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the second electrode has a fixed uniform structure, then the manufacturing process is simple, but it cannot enable selective cutting of defective areas without affecting adjacent pixels
Solution Approach 1:
The second electrode is divided into multiple separate overlapping parts, each corresponding to a specific light emitting element. This segmentation allows individual parts to be selectively cut without affecting other parts, enabling precise repair of defective pixels while preserving adjacent functional areas.
Solution Approach 2:
Each overlapping part of the second electrode is designed with specific local characteristics (shape, size, position) tailored to its corresponding light emitting element. This local customization enables targeted laser cutting for repair while maintaining the integrity and functionality of other electrode regions.
2Ease of repair
If the overlapping parts are closely connected, then the electrode structure is continuous and simple, but cutting one area may affect adjacent areas
Solution Approach 1:
The second electrode is segmented into distinct overlapping parts with clear separations. These separations act as isolation barriers that prevent the propagation of cutting effects to adjacent areas, allowing independent repair of each light emitting element without compromising the continuity or functionality of the overall electrode structure.
Solution Approach 2:
The openings in the second electrode serve as intermediary spaces that physically separate the overlapping parts. These intermediary regions act as buffers that stop the propagation of laser cutting effects, enabling isolated repair operations while maintaining the structural stability of the electrode system.
3Ease of repair
If the second electrode completely covers the light emitting element, then the electrical connection is ensured, but repair requires cutting through the entire electrode structure
Solution Approach 1:
The second electrode is segmented into overlapping parts that individually cover specific light emitting elements. This segmentation allows repair operations to be limited to cutting only the specific overlapping part corresponding to the defective element, rather than cutting through a continuous large-area electrode, thereby minimizing cutting requirements while maintaining reliable electrical connections for functional areas.
Solution Approach 2:
Each overlapping part is designed with local coverage optimized for its corresponding light emitting element. This local quality ensures that electrical connections are maintained where needed while allowing selective removal of only the defective portion during repair, reducing the overall cutting requirement while preserving connection reliability in functional regions.
4Ease of repair
If the electrode structure is simple and uniform, then manufacturing is easier, but it cannot provide targeted repair capability for different light emitting elements
Solution Approach 1:
The second electrode is fabricated as multiple separate overlapping parts rather than a single uniform structure. This segmentation enables targeted repair capability for different light emitting elements, as each part can be independently modified or removed. The manufacturing process accommodates this complexity through standardized patterning techniques that can produce the segmented structure efficiently.
Solution Approach 2:
The electrode structure incorporates local quality variations where each overlapping part has specific shape, size, and position characteristics tailored to its corresponding light emitting element. This local customization provides targeted repair capability while the manufacturing process uses precise patterning methods to produce these varied local structures in a controlled and efficient manner.
Data Source
AI summary
A display device includes a pixel, the pixel includes a first electrode; at least one light emitting element disposed on the first electrode; and a second electrode including at least one overlapping part overlapping the at least one light emitting element and including at least one opening not overlapping the at least one light emitting element, and a shape, a size, and a position of the overlapping part of the second electrode vary according to a position of the at least one light emitting element and a number of light emitting elements.