Micro-LED Driving Backplane with Backup Electrodes for Pixel Repair
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Solution Overview
Problem
Conventional micro-LED display panel manufacturing processes face challenges in repairing defective LED pixels, leading to lower product yield due to the difficulty in replacing defective chips during the assembly process.
Innovation Solution
A driving backplane design featuring multiple pairs of electrodes, where one pair is used for the main LED chip and additional pairs act as backups, allowing for easy replacement of defective chips by soldering a normal chip onto the backup electrodes, thereby improving the yield of micro-LED display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional micro-LED display panel manufacturing processes are used, then the manufacturing process is simple, but the product yield is low due to inability to repair defective LED pixels
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple pairs of electrodes (first pair, second pair, and third pair) in the driving backplane before the LED chip mounting process. This allows backup electrodes to be ready in advance for replacing defective chips, enabling yield improvement without complicating the actual manufacturing process.
Solution Approach 2:
The patent changes the structural parameter of the driving backplane by incorporating multiple pairs of electrodes with different configurations (different anode/cathode arrangements) rather than using a single pair. This parameter change enables flexibility in replacing defective LEDs while maintaining a relatively simple overall structure.
2Reliability
If multiple pairs of electrodes are added to enable repair, then product yield is improved, but device complexity increases
Solution Approach 1:
The patent segments the electrode system into multiple independent pairs (first pair with first anode/first cathode, second pair with second anode/second cathode, third pair with third anode/third cathode). Each pair can independently support an LED chip, allowing selective replacement of defective chips without affecting other pixels, thus improving repairability while keeping each segment simple.
Solution Approach 2:
The driving backplane is designed with multi-functionality by incorporating multiple pairs of electrodes that can serve as primary or backup connections. Any of the electrode pairs can be used to mount an LED chip, providing universal functionality that enhances repairability without requiring complex switching mechanisms.
Data Source
AI summary
The present disclosure relates to a driving backplane, a micro-LED display panel and a micro-LED display device. The driving backplane, includes a plurality of pixel units arranged in an array, each of the pixel units comprising: an anode lead; a cathode lead at a side of the anode lead; and at least two pairs of electrodes, each pair of electrodes of the at least two pairs of electrodes including an anode and a cathode oppositely disposed, the anode being electrically connected to the anode lead, and the cathode being electrically connected to the cathode lead. In the course of using the foregoing driving backplane of the micro-LED display panel, it is only necessary to solder an LED chip on one pair of electrodes of the at least two pairs of electrodes.