Light-Emitting Display Structure With Refractive Insulating Layers
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Solution Overview
Problem
Existing display devices face challenges in enhancing light emission efficiency of light emitting elements, particularly in structures where the common electrode does not effectively reflect light emitted from the light emitting elements.
Innovation Solution
A display device design that includes a common electrode surrounding light emitting elements, with heterogeneous insulating layers having different refractive indices to enhance light reflection and a concave-convex structure of the third semiconductor layer, along with a capping layer and reflective layer to improve light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a common electrode is formed to surround light emitting elements, then light reflection efficiency is improved, but device structure complexity increases
Solution Approach 1:
The common electrode is nested within the heterogeneous insulating layers, forming a layered structure where the electrode is surrounded by insulating material. This nesting approach enables effective light reflection while maintaining a compact and integrated device structure, reducing overall complexity despite the added functional layer.
Solution Approach 2:
The patent employs heterogeneous insulating layers with different refractive indices surrounding the common electrode. This composite material approach optimizes light reflection efficiency by utilizing materials with complementary optical properties, achieving superior performance while organizing complexity through systematic material selection.
2Loss of energy
If heterogeneous insulating layers with different refractive indices are used, then light emission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The heterogeneous insulating layers are positioned specifically around the light emitting elements where light extraction is most critical. By applying different refractive index materials at different locations (closer to vs. farther from the active layer), the patent optimizes light emission efficiency locally without requiring high precision throughout the entire device structure.
Solution Approach 2:
The patent uses multiple insulating layers with progressively different refractive indices to achieve sufficient light extraction. Rather than requiring perfect optimization of a single layer, the partial action of multiple layers with moderate precision each collectively achieves the desired overall light emission efficiency.
3Reliability
If the common electrode directly contacts the second semiconductor layer, then electrical conductivity is improved, but risk of short circuit increases
Solution Approach 1:
The heterogeneous insulating layers serve as intermediary structures that manage the interface between the common electrode and semiconductor layers. These insulating layers provide electrical isolation where needed while allowing the common electrode to maintain contact with the second semiconductor layer for conductivity, thus mediating between the conflicting requirements of conductivity and short circuit prevention.
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 improves light emission efficiency by effectively reflecting light emitted from the light emitting elements, enhancing the overall performance of the display device.
Implementation Method 1
two or more heterogeneous insulating layers having different refractive indices, and the heterogeneous insulating layers surround top and side surfaces of the first semiconductor layer and further surround at least a portion of a side surface of the second semiconductor layer
Implementation Method 2
heterogeneous insulating layers having different refractive indices
Implementation Method 3
a common electrode disposed on the first via layer and surrounding side surfaces of the light emitting elements
Implementation Method 4
The third semiconductor layer may have a substantially concave-convex structure
Data Source
AI summary
A display device includes a pixel electrode disposed on a substrate, light emitting elements disposed on the pixel electrode, the light emitting elements including a first semiconductor layer, an active layer, a second semiconductor layer, and a third semiconductor layer, a first via layer disposed on the substrate, and having a higher height than a height of the active layer and having a lower height than a height of the third semiconductor layer and a common electrode disposed on the first via layer and surrounding the side surfaces of the light emitting elements, the light emitting elements include two or more heterogeneous insulating layers having different refractive indices, and the heterogeneous insulating layers surround top and side surfaces of the first semiconductor layer and side surfaces of the first semiconductor layer and further surround at least a portion of a side surface of the second semiconductor layer.