LED Display Electrode Layout for Lower Contact Resistance
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Solution Overview
Problem
Current display devices face inefficiencies in luminous efficiency due to high contact resistance between light emitting elements and common electrodes, limiting the performance of light emitting diodes.
Innovation Solution
The display device design includes a common electrode in contact with the side surface of a second semiconductor layer, reducing contact resistance and enhancing current flow, and features a specific layer structure with a first via layer, insulating layer, and capping layers to optimize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the common electrode is disposed on the first via layer and light emitting elements, then the structural stability is improved, but the contact resistance between the common electrode and second semiconductor layer increases
Solution Approach 1:
The common electrode is configured to contact the side surface of the second semiconductor layer in addition to the top surface, transitioning from a single-point contact to a multi-dimensional contact. This side surface contact extends the contact area into a different spatial dimension, reducing contact resistance while preserving structural stability.
Solution Approach 2:
The contact interface between the common electrode and second semiconductor layer is segmented into multiple contact regions: top surface contact and side surface contact. This segmentation distributes the contact stress and provides multiple current pathways, reducing overall contact resistance while maintaining structural integrity.
2Reliability
If the contact area between common electrode and second semiconductor layer is increased, then the contact resistance is reduced, but the device complexity increases
Solution Approach 1:
The first via layer serves multiple functions: it provides mechanical support for the common electrode, defines the contact region geometry, and enables the side surface contact configuration. This multi-functionality increases contact area without requiring additional dedicated structural elements, thereby reducing device complexity.
Solution Approach 2:
The common electrode is designed to create an equipotential surface that contacts both the top and side surfaces of the second semiconductor layer. This equipotential configuration ensures uniform current distribution across the contact interface, reducing contact resistance without requiring complex current management structures.
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 configuration improves the luminous efficiency of light emitting elements by reducing contact resistance and aligning the top surfaces of the common electrode and semiconductor layers, leading to enhanced light emission performance.
Implementation Method 1
the common electrode may be in contact with a side surface of the second semiconductor layer
Implementation Method 2
light emitting elements disposed on the pixel electrode
Data Source
AI summary
A display device comprises a pixel electrode disposed on a substrate, light emitting elements disposed on the pixel electrode, a first via layer disposed on the pixel electrode and filled between the light emitting elements, and a common electrode disposed on the first via layer and the light emitting elements, wherein each of the light emitting elements includes a first semiconductor layer including a p-type dopant, an active layer disposed on the first semiconductor layer, a second semiconductor layer disposed on the active layer and including an n-type dopant, and a third semiconductor layer disposed on the second semiconductor layer, and the common electrode is in contact with a side surface of the second semiconductor layer.