Stripe Electrodes for LED Alignment and Light Transmission
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Solution Overview
Problem
Current self-emission type displays face issues with alignment and precision during the transfer process of light-emitting diodes (LEDs), leading to disconnection problems and reduced light output efficiency due to the need for large interconnection areas.
Innovation Solution
The use of stripe electrodes extending over a large area ensures successful connection of LEDs even with alignment errors, while the stripe design allows light to be transmitted through gaps between electrodes, enhancing light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical device or PDMS transfer process is used to mount LEDs on substrate, then the LEDs can be positioned on the substrate, but alignment and precision problems occur during the transfer process
Solution Approach 1:
The electrode is divided into multiple stripe portions arranged in parallel. This segmentation allows the electrode structure to accommodate alignment variations by providing multiple potential connection points along the length of each stripe, thereby maintaining connection reliability even when LED placement precision is limited
Solution Approach 2:
The electrode design changes from a conventional point-contact or small-area electrode to extended stripe electrodes with specific width and spacing parameters. This parameter change increases the effective connection area and tolerance range, allowing successful LED mounting even with alignment errors in the transfer process
2Reliability
If a large area of interconnection is used to compensate for inadequate alignment, then disconnection problems are avoided, but light output efficiency decreases
Solution Approach 1:
The electrode structure implements local quality by creating stripe portions that are conductive for electrical connection but transparent or open in the regions between stripes for light transmission. This allows the electrode to simultaneously provide adequate connection area for reliability while maintaining high light output efficiency by minimizing the blocking area
Solution Approach 2:
The electrode design effectively creates a porous or open-work structure through the stripe pattern, where the spaces between stripes allow light to pass through while the stripes themselves provide the necessary electrical connection pathways. This structure reconciles the conflicting requirements of connection area and light transmission
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively improves light output efficiency by ensuring LED connection and optimizing light transmission through the electrode structure, addressing alignment issues and enhancing display performance.
Implementation Method 1
a light-emitting element disposed on the carrier substrate and having a first pad and a second pad
Implementation Method 2
current light-emitting diodes have been provided with high brightness output
Data Source
AI summary
A self-emission type display including a carrier substrate, a light-emitting element, a first electrode, and a second electrode is provided. The light-emitting element is disposed on the carrier substrate and has a first pad and a second pad. The first electrode has a plurality of first stripe portions electrically connected to a first electric potential. The first pad of the light-emitting element is electrically connected to the carrier substrate through at least one first strip portion. The second electrode has a plurality of second stripe portions electrically connected to a second electric potential. The first electrode and the second electrode are separated from each other. The second pad of the light-emitting element is electrically connected to the carrier substrate through at least one second strip portion. The first electric potential is different from the second electric potential.