Self-Emission Display Repairing Electrodes Alignment
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Solution Overview
Problem
The alignment and precision issues during the transfer process of LEDs in self-emission type displays lead to incorrect connections, reducing the yield and increasing the scrap rate of these displays.
Innovation Solution
Incorporating a carrier substrate with a first electrode, a second electrode, and a plurality of repairing electrodes, where the repairing electrodes are electrically insulated from the main electrodes and can be used to connect the light-emitting element to the appropriate voltage levels, allowing for correction of alignment errors and ensuring proper electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical transfer method is used to mount LEDs on substrate, then mounting process is simple, but alignment precision deteriorates causing incorrect connections
Solution Approach 1:
The electrode structure is segmented into multiple levels (first level and second level) with repairing electrodes at different positions. This segmentation allows the LED to be connected to appropriate electrodes based on its actual mounting position, resolving the alignment precision issue while maintaining simple mechanical transfer process
Solution Approach 2:
The patent introduces a vertical dimension by creating electrodes at different levels (first level and second level) rather than only horizontal arrangement. This multi-level structure enables correct electrical connection even when LED mounting position deviates in the horizontal plane, thus solving the alignment precision problem
2Manufacturing precision
If strict alignment control is implemented during LED transfer, then connection accuracy improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The repairing electrodes are pre-configured at different levels and positions before LED mounting. This preliminary arrangement ensures that regardless of the LED's actual mounting position, the correct electrical connection can be established without requiring complex real-time alignment control during the transfer process
Solution Approach 2:
The patent changes the electrical connection parameters by providing multiple electrode levels and selecting appropriate connections based on the LED's actual mounting position. This parameter change approach simplifies the alignment control requirement while maintaining high connection accuracy
3Productivity
If repairing electrodes are added to carrier substrate, then yield increases by correcting alignment errors, but device complexity increases
Solution Approach 1:
The repairing electrodes serve multiple functions: they can connect to either the first level or second level electrodes depending on the LED's mounting position, and can be selectively connected or disconnected. This multi-functionality increases manufacturing yield while the added complexity is minimized through the versatile design
Data Source
AI summary
The present invention proposes a self-emission type display and a repairing method thereof. The self-emission type display includes a carrier substrate and a light-emitting element. The carrier substrate includes a first electrode, a second electrode, and a plurality of repairing electrodes. The first electrode has a plurality of first strip portions connected to a first level. The second electrode has a plurality of second strip portions connected to a second level. The first electrode is separated from the second electrode, and the first level is different from the second level. The repairing electrodes are electrically insulated from the first electrode and the second electrode. The light-emitting element is disposed on the carrier substrate and has a first connecting portion and a second connecting portion. The first connecting portion is electrically connected to the first level through the first strip portions. The second connecting portion is electrically connected to the second level through the second strip portions.