Light-Emitting Substrate Pad Layout for Gold Infiltration Control
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Solution Overview
Problem
In micro LED display technology, the close proximity of reflective layers and pads during processing can lead to 'gold infiltration' issues, causing short circuits and affecting light-emitting efficiency, while optimizing the opening size of the reflective layer to prevent this can compromise the reflective effect and lead to uneven light emission due to potential tilting of light-emitting elements.
Innovation Solution
A light-emitting substrate design with a reflective layer having an opening of specific size and shape, where the pad's projection overlaps partially with the opening, and a connecting portion with an edge radian region, ensuring a suitable interval to reduce gold infiltration and minimize the risk of light-emitting element tilt, thereby optimizing optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening size of the reflective layer is reduced to prevent gold infiltration, then the risk of short circuits is reduced, but the reflective effect is compromised leading to uneven light emission
Solution Approach 1:
The pad structure is divided into different regions with different functions: a first region (first size portion) that maintains distance from the opening to prevent gold infiltration, and a second region (second size portion) that extends closer to the opening to maintain reflective effect and light emission uniformity. This local differentiation resolves the contradiction between preventing short circuits and maintaining optical performance.
2Illumination intensity
If the pad is positioned closer to the opening to maintain reflective effect, then light emission uniformity is improved, but gold infiltration occurs causing short circuits
Solution Approach 1:
Different portions of the pad serve different purposes: the first size portion is positioned to prevent gold infiltration and short circuits, while the second size portion is positioned to maintain the reflective effect and ensure uniform light emission. This spatial differentiation of functions resolves the contradiction.
3Illumination intensity
If the opening size is increased to improve reflective effect, then light emission uniformity is improved, but the risk of gold infiltration and short circuits increases
Solution Approach 1:
The pad's first size portion maintains a safe distance from the opening to prevent gold infiltration, while the second size portion extends closer to utilize the reflective effect for uniform light emission. This allows the opening to be optimally sized for reflection without increasing short circuit risk.
4Reliability
If the pad is positioned farther from the opening to prevent gold infiltration, then short circuit risk is reduced, but light emission uniformity deteriorates due to potential tilting
Solution Approach 1:
The first size portion of the pad is positioned farther from the opening to prevent gold infiltration and ensure reliable electrical connection, while the second size portion extends closer to maintain the reflective effect and prevent light-emitting element tilting, ensuring uniform light emission.
Solution Approach 2:
The pad structure is designed in advance with the two-size portion configuration that proactively prevents both gold infiltration and light-emitting element tilting, eliminating the need for post-processing adjustments and ensuring both reliability and optical performance from the outset.
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 design effectively reduces the risk of short circuits and tilting, maintaining the reflective effect while ensuring uniform light emission by maintaining a suitable distance between the pad and the reflective layer, thus enhancing the overall performance of the light-emitting substrate.
Implementation Method 1
a reflective layer, arranged on the base substrate, wherein the reflective layer includes an opening
Data Source
AI summary
A light-emitting substrate and a display device are provided. The light-emitting substrate includes a base substrate, a reflective layer, at least one pad, a light-emitting element and a connecting portion. The reflective layer includes an opening with a maximum size H1 in a first direction; the light-emitting element includes a first electrode and a second electrode arranged at intervals in a second direction, and a maximum size of the first electrode or the second electrode in the first direction is a first size K1; the connecting portion includes an edge radian region with a maximum size M in the first direction; the at least one pad includes a first pad, the first pad includes a first size portion, a minimum distance between the first size portion and the opening in the first direction is a second size K2 which satisfies: K2≤0.5H1−0.5(K1+2M), and 50 μm≤H1−2K2−K1≤100 μm.