OLED Pixel Circuit Reconnection for Defect Isolation and Visibility
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Solution Overview
Problem
Existing organic light emitting diode (OLED) displays face issues with high defect rates and image quality deterioration, which affect their performance and reliability.
Innovation Solution
The display device incorporates specific transistor configurations and connection modifications, including cutting and reconnecting data connection electrodes, and utilizing light blocking layers and dummy electrodes to enhance pixel circuit connectivity and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data connection electrodes are cut and reconnecting is performed, then defect rates are reduced and image quality is improved, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The data connection electrode is divided into multiple segments through cutting, allowing defective portions to be isolated. The electrode is segmented into a first data connection electrode and a second data connection electrode, enabling selective connection to bypass defective transistors while maintaining overall functionality.
Solution Approach 2:
A light blocking layer serves as an intermediary element that facilitates the reconnection process. The light blocking layer is positioned to block light from defective regions while allowing electrical reconnection through intermediate connection structures, mediating between the cut electrode segments.
2Reliability
If data connection electrodes are cut and reconnecting is performed, then transistor performance is stabilized, but manufacturing process complexity increases
Solution Approach 1:
The cutting and reconnection of data connection electrodes is performed as a preliminary action during the manufacturing process, before final device assembly. This allows defective transistors to be identified and bypassed early, stabilizing transistor performance throughout the device lifecycle.
Solution Approach 2:
The reconnection is achieved by transitioning to another dimensional approach - using vertical stacking and layered connections instead of simple planar connections. The light blocking layer and intermediate connection electrodes create three-dimensional connection paths that bypass defective regions.
3Illumination intensity
If light blocking layers and dummy electrodes are added, then pixel visibility is enhanced, but device complexity increases
Solution Approach 1:
Light blocking layers are added locally to specific regions where visibility enhancement is needed, rather than uniformly across the entire device. Dummy electrodes are positioned at specific locations to block light from defective pixels, providing local quality improvement without global complexity increase.
Solution Approach 2:
Dummy electrodes are created as copies of functional electrode structures but positioned to serve light blocking functions. These dummy electrodes replicate the physical form of real electrodes while serving a different purpose - blocking light from defective regions rather than conducting electrical signals.
Data Source
AI summary
A display device includes: a first light emitting element; a (1-2)-th transistor including a gate electrode connected to a first scan line, a drain electrode connected to a first data line, and a source electrode; a second light emitting element; a (2-2)-th transistor including a gate electrode connected to the first scan line, a drain electrode connected to a second data line, and a source electrode; a first data connection electrode connected to the first data line and the drain electrode of the (1-2)-th transistor; and a second data connection electrode connected to the second data line and the drain electrode of the (2-2)-th transistor. At least one of the drain electrode of the (1-2)-th transistor or the first data connection electrode is cut, the second data connection electrode is cut, and the second data connection electrode and the first data line are connected to each other.