Light Emitting Element Surface Layout for Central Brightness Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting elements do not effectively create a large brightness difference between the central region and the peripheral region of the primary light extraction face.
Innovation Solution
A light emitting element with a semiconductor structure having a first semiconductor layer with a central region of higher surface roughness and a peripheral region with a first reflecting film, and a first protective film with higher light transmittance on the central region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a first reflecting film is disposed only on the peripheral region and a first protective film with higher light transmittance is disposed on the central region, then a large brightness difference between the central region and the peripheral region is achieved, but the device complexity increases due to region-specific film placement
Solution Approach 1:
The patent applies local quality by disposing different types of films in different regions of the light extraction face. Specifically, a first reflecting film is placed only on the peripheral region while a first protective film with higher light transmittance is placed on the central region. This regional differentiation creates the desired brightness difference without requiring complex overall device redesign.
2Productivity
If the first face has higher surface roughness in the central region than in the peripheral region, then light extraction efficiency is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by creating different surface roughness characteristics in different regions of the first face. The central region is designed with higher surface roughness to enhance light extraction efficiency, while the peripheral region maintains lower surface roughness. This regional differentiation is achieved through controlled manufacturing processes that can selectively modify surface properties in specific areas.
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
Achieves a significant brightness difference between the central and peripheral regions, enhancing light extraction efficiency and reducing chipping around the perimeter.
Implementation Method 1
a first reflecting film is disposed only on the peripheral region among the surfaces of the semiconductor structure
Implementation Method 2
a first protective film having a higher light transmittance for the peak wavelength of the light emitted by the active layer than that of the first reflecting film is disposed on the central region
Implementation Method 3
an active layer disposed on the first region
Data Source
AI summary
A light emitting element includes: a semiconductor structure including: a first semiconductor layer that has: a first face that has a peripheral region, and a central region surrounded by the peripheral region in a plan view, wherein a surface roughness of the central region is higher than a surface roughness of the peripheral region, and a second face that opposes the first face and has a first region and a second region, an active layer disposed on the first region, and a second semiconductor layer disposed on the active layer; a first electrode disposed on the second region and electrically connected to the first semiconductor layer; a second electrode disposed on the second semiconductor layer and electrically connected to the second semiconductor layer; a first reflecting film disposed only on the peripheral region among the surfaces of the semiconductor structure; and a first protective film disposed on the central region.