Display Pixel Electrode Structure for Contact-Failure Repair
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Solution Overview
Problem
Current display devices lack an effective method for repairing defective pixels, particularly in cases of contact failure between light emitting elements and electrodes, which affects the overall display performance.
Innovation Solution
The display device incorporates a design with a first electrode, an outer electrode, and a bank with an opening exposing the first electrode, along with a connection part and a dummy light emitting element, allowing for the disconnection of the outer electrode from the first electrode to repair defective pixels by adjusting the electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the outer electrode is electrically connected to the first electrode through a connection part, then the electrical connection is maintained, but defective pixels cannot be repaired when contact failure occurs
Solution Approach 1:
The electrode connection structure is segmented into separable components: the outer electrode, the first electrode, and the connection part. This segmentation allows the outer electrode to be electrically disconnected from the first electrode when contact failure occurs, enabling pixel repair by isolating the defective light emitting element while maintaining the overall structural integrity of the display device.
2Adaptability or versatility
If the outer electrode surrounds the first electrode with spacing, then the structure provides design flexibility, but electrical connection reliability may be compromised
Solution Approach 1:
The connection part serves as an intermediary element between the outer electrode and the first electrode. It provides a controlled electrical connection path that maintains reliability while allowing the outer electrode to surround the first electrode with necessary spacing for structural flexibility and light emission. The connection part ensures stable electrical contact while accommodating the spatial arrangement required for device functionality.
3Device complexity
If the bank overlaps the outer electrode, then the structure is compact, but access to the first electrode for repair is limited
Solution Approach 1:
The bank structure is designed to overlap the outer electrode while leaving the first electrode accessible through openings or exposed regions. This segmentation allows the compact overlapping arrangement to be maintained while providing necessary access paths to the first electrode for repair operations. The outer electrode can be electrically disconnected and removed or adjusted without requiring disassembly of the entire bank structure.
4Use of energy by moving object
If the light emitting element is disposed on the first electrode in the opening of the bank, then light emission efficiency is maximized, but contact failure affects the entire pixel
Solution Approach 1:
The pixel structure is segmented into independently controllable electrical components: the first electrode, the light emitting element, and the outer electrode connection system. When contact failure occurs between the light emitting element and the first electrode, the outer electrode can be electrically disconnected to isolate the defective element. This segmentation allows repair by removing or replacing only the defective light emitting element while preserving the first electrode and other functional components, thereby maintaining overall pixel reliability.
Data Source
AI summary
A display device includes a first electrode, an outer electrode surrounding the first electrode, a bank overlapping the outer electrode in a plan view, the bank including an opening that exposes the first electrode, a light emitting element disposed on the first electrode and in the opening of the bank, and a second electrode disposed on the light emitting element. The outer electrode may be electrically disconnected from the first electrode upon a bad contact between a light emitting member and the outer electrode. As a result, defective pixels can be repaired.