Display Electrode Layout With Bridge Paths for Dark Spot Prevention
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Solution Overview
Problem
Display devices face issues with dark spot defects due to the absence of light-emitting elements between connection electrodes, leading to disrupted current paths and non-functional sub-pixels.
Innovation Solution
A display device design that includes a first electrode, a second electrode, and a third electrode with light-emitting elements and connection electrodes, along with electrode patterns and bridge patterns to form alternative current paths, allowing electric current to flow even without light-emitting diodes between certain electrodes, thereby addressing dark spot defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If no light-emitting element is disposed between connection electrodes, then the manufacturing process is simplified, but dark spot defects occur due to disconnected current paths
Solution Approach 1:
The patent introduces an intermediary current path consisting of electrode patterns and bridge patterns that mediate between the connection electrodes. When no light-emitting element is present, this intermediary path provides an alternative route for current flow, preventing dark spot defects while maintaining manufacturing simplicity.
Solution Approach 2:
The current path is segmented into multiple components: connection electrodes, electrode patterns, and bridge patterns. This segmentation allows the system to provide alternative current routes through different segments when one path is blocked, resolving the contradiction between manufacturing simplicity and current path reliability.
2Reliability
If alternative current paths are formed using electrode patterns and bridge patterns, then dark spot defects are prevented, but device complexity increases
Solution Approach 1:
The electrode patterns and bridge patterns are merged with the existing electrode structure, forming an integrated current path system. This merging approach provides alternative current routes without significantly increasing device complexity, as the additional elements are seamlessly incorporated into the overall electrode architecture.
Solution Approach 2:
The electrode patterns serve multiple functions: they act as current paths during normal operation and provide alternative routes when light-emitting elements are absent. This multi-functionality reduces the need for separate repair mechanisms, maintaining device complexity at acceptable levels while ensuring current path continuity.
3Productivity
If alternative current paths are formed, then productivity is improved by enabling repair of dark spot defects, but manufacturing precision requirements increase
Solution Approach 1:
The alternative current paths are built into the device structure during manufacturing, before any defects occur. This preliminary action ensures that repair capabilities are pre-established, allowing for easier defect correction without requiring high-precision adjustments during the repair process itself.
Solution Approach 2:
The design allows for parameter adjustments in the electrode patterns and bridge patterns to optimize alignment tolerance. By modifying geometric parameters such as pattern width, spacing, and connection dimensions, the system maintains manufacturing precision within achievable limits while still providing effective alternative current paths.
Data Source
AI summary
A display device includes a first electrode, a second electrode, and a third electrode extending in one direction on a substrate and being spaced from one another, a first light-emitting element between the first electrode and the second electrode, and a second light-emitting element between the second electrode and the third electrode, a first connection electrode on the first electrode and in contact with a first end of the first light-emitting element, a second connection electrode on one side of the second electrode and in contact with a first end of the second light-emitting element, a third connection electrode on an opposite side of the second electrode and in contact with a second end of the first light-emitting element, and a fourth connection electrode on the third electrode and in contact with a second end of the second light-emitting element.