Repairing OLED Pixel Structure via Redundant Active Device Substitution
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Solution Overview
Problem
The fabrication failures in the driving TFT of organic electro-luminescence displays can lead to significant deterioration in display quality due to neglect in the manufacturing process, making the pixel structure non-functional.
Innovation Solution
A repairable pixel structure is designed with a current control unit, a pixel electrode, and a redundant active device electrically connected to the scan line, data line, and power line, allowing for the substitution of a failed active device with the redundant one through methods like laser cutting and welding, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel structure without redundant components is used, then the device complexity is low, but the reliability deteriorates when fabrication failures occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring a redundant active device in the pixel structure before fabrication failures occur. The redundant device is prepared in advance with all necessary electrical connections (scan line, data line, power line) already in place, so that if the primary active device fails, the system can immediately switch to the redundant device without requiring complex repair operations or additional fabrication steps.
2Manufacturing precision
If fabrication process neglect occurs, then manufacturing precision deteriorates, but the loss of time for continuous processing of inferior structures increases
Solution Approach 1:
The redundant active device is prepared in advance during the same fabrication process as the primary device, allowing immediate substitution if fabrication defects are detected. This eliminates the need for time-consuming re-fabrication or repair operations, as the replacement device is already manufactured and electrically connected.
Solution Approach 2:
The patent implements discarding and recovering by allowing the system to discard the defective primary active device and recover functionality by activating the redundant device. This approach prevents continuous processing of inferior structures by enabling immediate replacement, thereby recovering production time and avoiding waste of subsequent processing steps on defective pixels.
3Ease of repair
If repair methods involving laser cutting and welding are implemented, then ease of repair improves, but the device complexity increases
Solution Approach 1:
All electrical connections for the redundant active device (scan line, data line, power line connections) are established in advance during fabrication. This preliminary configuration means that repair operations only require simple activation switching rather than complex wire bonding or connection establishment, significantly easing the repair process while minimizing added complexity.
Data Source
AI summary
The invention provides a method of repairing the pixel structure, and the method includes the following. First, an electrical connection between the current control unit and the power line is cut. The power line is then electrically connected to the redundant active device, so that the current control unit and the redundant active device control the current provided by the power line. The invention provides a method of repairing the organic electro-luminescence display unit, suitable for repairing the above-mentioned organic electro-luminescence display unit, and the method includes the following. First, an electrical connection between the current control unit and the power line is cut. The power line is electrically connected to the redundant active device, so that the current control unit and the redundant active device control the current passing through the organic electro-luminescence layer.