LED Light Extraction via Concave Semiconductor Structure
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Solution Overview
Problem
The existing light emission display devices face challenges in achieving high light efficiency and reliable transplant processes due to difficulties in controlling the light path of LED elements and the vulnerability of organic light emission devices to moisture and oxygen, which leads to defective pixels and increased manufacturing costs.
Innovation Solution
A light emission element with a concave portion in the semiconductor layer to improve light efficiency, where the light emission layer is disposed along the concave shape, and a color filter or color conversion layer is placed inside the concave portion to control the optical path, reducing the number of elements to be transplanted and enhancing productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light emission layer is disposed on a flat semiconductor layer, then the manufacturing process is simple, but the light efficiency is low due to uncontrolled light path
Solution Approach 1:
The patent introduces a concave portion in the semiconductor layer with a curved bottom surface. This curvature structure controls the light path by causing light emitted from the light emission layer to reflect off the curved bottom surface at specific angles, directing more light toward the extraction surface and improving light efficiency without complicating the manufacturing process
2Adaptability or versatility
If multiple separate elements are used for light emission and color filtering, then the functional requirements are met, but the number of elements to be transplanted increases, reducing productivity
Solution Approach 1:
The patent integrates the light emission layer, color filter layer, and semiconductor layer into a single unified light emission element structure. The color filter is positioned within the concave portion alongside the light emission layer, allowing both light emission and color filtering functions to be achieved in one element, thereby reducing the number of separate elements that need to be transplanted and improving productivity
3Adaptability or versatility
If organic materials are used for light emission, then flexibility in display device design is improved, but vulnerability to moisture and oxygen increases, leading to defective pixels
Solution Approach 1:
The patent employs an inorganic semiconductor layer as the base structure for the light emission element. Inorganic materials inherently provide better resistance to moisture and oxygen penetration compared to organic materials, creating a more stable and reliable environment for light emission while maintaining the desired flexibility in display device design
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 increases light efficiency, reduces defective rates during the transplant process, and simplifies the manufacturing process, resulting in improved productivity and stability for display devices.
Implementation Method 1
An LED element is a semiconductor light emission element that emits light when a current is provided to the semiconductor
Implementation Method 2
a light emission layer is disposed on the first semiconductor layer along the concave portion... to control the optical path
Data Source
AI summary
A light emission element includes a first semiconductor layer, a light emission layer, and a second semiconductor layer. The first semiconductor layer in the light emission portion is provided with a concave portion having a concave shape. The light emission layer and the second semiconductor layer disposed on the first semiconductor layer are also disposed along the concave shape of the concave portion. The light emitting layer disposed along the shape of the concave portion emits light by electrons and holes injected from the first semiconductor layer and the second semiconductor layer. Further, the light path of the light emitted according to the concave shape is adjusted. Therefore, a light emission element having improved light efficiency and a display device using the same can be provided.