Asymmetric Light-Emitting Element Structure for Better Inkjet Yield
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Solution Overview
Problem
Current light emitting elements face inefficiencies in light emission and manufacturing processes, including defects and reduced inkjet process efficiency.
Innovation Solution
A light emitting element design featuring a first and second semiconductor layer with an active layer in between, where the first surface has a larger area than the second surface, and the distance between them is shorter than the surface length, optimized for shapes like truncated cones or prismoids, with specific geometric relationships and etching processes to enhance light emission and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light emitting element structure is used, then the manufacturing process is simpler, but the light emitting efficiency is reduced and defects occur
Solution Approach 1:
The light emitting element employs an asymmetric structure where the first surface area is larger than the second surface area, and the distance between surfaces is shorter than the surface length. This asymmetric geometry optimizes light extraction efficiency and prevents shortage defects by improving carrier injection and recombination at the active layer, directly resolving the contradiction between light emitting efficiency and structural simplicity.
2Productivity
If conventional manufacturing processes are used, then the process is easier to implement, but inkjet process efficiency is reduced and shortages occur
Solution Approach 1:
The invention specifies precise geometric parameters including the asymmetric surface area relationship (first surface area > second surface area), the distance between surfaces being shorter than the surface length, and specific angle ranges (less than 60 degrees) for generating lines and side surfaces. These parameter optimizations enable improved inkjet printing efficiency and prevent manufacturing shortages while maintaining manufacturability through controlled etching processes where the etched region area decreases as etching depth increases.
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 emitting efficiency, prevents defects, and enhances the efficiency of the inkjet process, leading to improved performance and yield in light emitting devices.
Implementation Method 1
a first semiconductor layer adjacent to the first surface, the first semiconductor layer including a first type of semiconductor, a second semiconductor layer adjacent to the second surface, the second semiconductor layer including a second type of semiconductor different from the first type of semiconductor, and an active layer disposed between the first semiconductor layer and the second semiconductor layer
Data Source
AI summary
A light emitting element includes a first surface corresponding to an end of the light emitting element, a second surface corresponding to another end of the light emitting element, a first semiconductor layer adjacent to the first surface, the first semiconductor layer including a first type of semiconductor, a second semiconductor layer adjacent to the second surface, the second semiconductor layer including a second type of semiconductor different from the first type of semiconductor, and an active layer disposed between the first semiconductor layer and the second semiconductor layer. An area of the first surface is larger than an area of the second surface, and a distance between the first surface and the second surface is shorter than a length defined by the first surface.