Semiconductor LED Display Structure for Light Extraction and Leakage Control
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Solution Overview
Problem
Current display technologies, such as LCDs and AMOLEDs, face issues like slow response time, limited flexibility, short lifespan, and high manufacturing costs. Additionally, semiconductor light-emitting devices struggle with low light extraction efficiency and high surface leakage current.
Innovation Solution
A display apparatus is designed with semiconductor light-emitting devices that include a first and second conductive electrode, conductive semiconductor layers, an active layer, an intermediate layer with alternating layers of conductive impurities, and a protrusion made of a porous material capable of electro polishing. This structure enhances light extraction efficiency, reduces surface leakage current, and minimizes damage during substrate separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If semiconductor light-emitting devices are used in display apparatus, then response time is improved and flexibility is achieved, but light extraction efficiency is low and leakage current is high
Solution Approach 1:
The patent applies porous materials by forming a protrusion with a porous structure on the intermediate layer. This porous structure increases the surface area and creates multiple interfaces for light extraction, thereby improving light extraction efficiency while maintaining the flexibility and response time benefits of semiconductor light-emitting devices.
Solution Approach 2:
The patent employs curvature by creating a protrusion with a curved or rounded top surface on the intermediate layer. This curved structure enhances light extraction by reducing total internal reflection at the interface and providing multiple exit paths for photons, thus improving light extraction efficiency without compromising device flexibility.
2Adaptability or versatility
If semiconductor light-emitting devices are separated from growth substrate, then device flexibility is improved, but devices are damaged due to heat or chemicals
Solution Approach 1:
The patent uses an intermediate layer as a mediator between the semiconductor light-emitting device and the growth substrate. This intermediate layer protects the device from heat and chemical damage during separation while still allowing for successful detachment and flexibility. The intermediate layer acts as a buffer that absorbs the harmful effects of the separation process.
Solution Approach 2:
The patent applies beforehand cushioning by pre-forming the intermediate layer with specific mechanical and thermal properties before the separation process. This intermediate layer provides protective cushioning against heat and chemical exposure during subsequent processing steps, preventing damage to the semiconductor light-emitting device while enabling flexibility.
3Ease of manufacture
If conventional display technologies are used, then manufacturing is established, but response time is slow and flexibility is limited
Solution Approach 1:
The patent applies parameter changes by modifying the structural parameters of the display device, specifically by adding the intermediate layer with protrusion structure. This structural parameter change enables the use of semiconductor light-emitting devices which have inherently faster response times compared to conventional LCDs and OLEDs, while maintaining manufacturability through established semiconductor fabrication processes.
4Adaptability or versatility
If semiconductor light-emitting devices are used, then flexibility is improved, but leakage current increases
Solution Approach 1:
The patent applies local quality by creating a localized protrusion structure with specific electrical properties on the intermediate layer. This localized structure modifies the electric field distribution at the surface, reducing leakage current paths while maintaining the overall flexibility of the device. The protrusion creates regions of different electrical characteristics in specific locations to address the leakage current issue.
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 proposed solution improves light extraction efficiency, reduces surface leakage current, and lowers manufacturing costs by preventing damage to semiconductor light-emitting devices during substrate separation, thereby enhancing the overall performance and cost-effectiveness of the display apparatus.
Implementation Method 1
a protrusion formed of a porous material capable of electro polishing on the intermediate layer
Implementation Method 2
an intermediate layer disposed on the second conductive semiconductor layer... an undoped semiconductor layer disposed between the intermediate layer and the protrusion
Data Source
AI summary
Discussed is a plurality of semiconductor light-emitting devices, wherein at least one of the semiconductor light-emitting devices includes: a first conductive electrode and a second conductive electrode; a first conductive semiconductor layer having the first conductive electrode arranged thereon; a second conductive semiconductor layer overlapping the first conductive semiconductor layer and having the second conductive electrode arranged thereon; an active layer arranged between the first conductive semiconductor layer and the second conductive semiconductor layer; an intermediate layer arranged on the second conductive semiconductor layer; a protrusion, made of an electro-polishable porous material, on the intermediate layer; and an undoped semiconductor layer arranged between the intermediate layer and the protrusion. The intermediate layer includes a first layer including second conductive impurities and a second layer having a higher concentration of the second conductive impurities than the first layer, wherein the first layer and the second layer are sequentially and repetitively stacked.