Display Substrate Binding Pad Design for Laser Transfer Stability
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Solution Overview
Problem
In the laser mass dissociation process for Micro LEDs and Mini LEDs, a significant portion of the laser light is irradiated onto the backplane film layer outside the light-emitting elements, affecting the stability and characteristics of the backplane.
Innovation Solution
A display substrate is designed with an enlarged binding pad that extends beyond the light-emitting element, creating a second region to block the dissociation light from reaching the backplane, thereby reducing the impact on the backplane's characteristics and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the binding pad size is increased to block stray light, then the backplane stability is improved, but the device complexity increases
Solution Approach 1:
The binding pad is divided into two functional regions: a first region that provides electrical connection and a second region that blocks stray light. This segmentation allows each region to perform its specific function optimally while maintaining overall system reliability.
Solution Approach 2:
The binding pad is designed to serve multiple functions simultaneously: electrical connection through the first region and light blocking through the second region. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while improving backplane stability.
2Object-affected harmful factors
If the binding pad extends beyond the light-emitting element, then the stray light blocking is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Different regions of the binding pad have different properties: the first region is optimized for electrical connection while the second region is optimized for light blocking. This local differentiation allows the extended second region to effectively block stray light without requiring the entire binding pad structure to meet high alignment precision standards.
Solution Approach 2:
The binding pad extends beyond the light-emitting element with a second region that provides excessive coverage for light blocking. This partial extension is sufficient to intercept stray light paths without requiring precise alignment across the entire binding pad structure, thereby reducing manufacturing precision requirements.
3Stability of the object's composition
If a larger binding pad is used to block light, then the backplane film layer stability is improved, but the area occupied increases
Solution Approach 1:
The binding pad is segmented into a first region for electrical connection and a second region for light blocking. This segmentation allows the second region to extend outward to block stray light without requiring a proportional increase in the overall binding pad area, as the first region maintains its compact size for electrical functions.
Solution Approach 2:
The light-blocking function is achieved by extending the binding pad in the planar dimension rather than increasing its thickness. This dimensional approach allows the second region to block stray light paths effectively while occupying minimal additional area on the backplane surface.
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
The enlarged binding pad effectively blocks stray light from reaching the backplane, enhancing the stability and characteristics of the backplane film layer during the light-emitting element transfer process.
Implementation Method 1
the binding pad includes a first region and a second region, the orthographic projection of the first region on the backplane is covered by the orthographic projection of the light-emitting element on the backplane, and the orthographic projection of the second region on the backplane is arranged on the outer side of the orthographic projection of the light-emitting element on the backplane
Data Source
AI summary
A display substrate, including a first substrate and a backplane arranged in a sequentially laminated manner, and a light-emitting layer, where the light-emitting layer includes a binding pads and a light-emitting elements arranged one-to-one corresponding to each other, where the binding pad is arranged on a side of the backplane away from the first substrate, and a pin of the light-emitting element is electrically connected to the binding pad, where the binding pad includes a first region and a second region, the orthographic projection of the first region on the backplane is covered by the orthographic projection of the light-emitting element on the backplane, and the orthographic projection of the second region on the backplane is arranged on the outer side of the orthographic projection of the light-emitting element on the backplane.