Light Emitting Structure With Stepped Contacts for Stable Nanocolumn Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In light emitting devices with nanostructures, varying diametrical sizes and pitches lead to height differences, causing potential contact failures between nanostructures and mounting boards during junction-down mounting, resulting in unstable connections.
Innovation Solution
The light emitting device design features conductive members with varying heights to ensure stable contact, with the second conductive member being taller than the first, and the use of insulating layers to reduce light diffusion and electrical shorts, allowing for multicolor emission from a single substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the diametrical sizes and pitch of nanostructures are changed to control wavelength, then multicolor emission is achieved, but the nanostructures become different in height, causing contact failure between low nanostructures and mounting board
Solution Approach 1:
The patent applies local quality by making the conductive members have different heights corresponding to different nanostructure heights. Specifically, the first conductive member has a first height matching the first nanostructure height, and the second conductive member has a second height matching the second nanostructure height, ensuring each nanostructure makes reliable contact with the mounting board despite height variations.
Solution Approach 2:
The patent introduces height as an additional dimensional variable for the conductive members. By varying the height of conductive members in the vertical dimension to match the varying heights of nanostructures, the patent resolves the contact failure issue while maintaining the wavelength control capability through diametrical size and pitch variations.
2Temperature
If junction-down mounting is used to efficiently radiate heat, then heat radiation performance is improved, but contact failure occurs between nanostructures of different heights and the mounting board
Solution Approach 1:
The patent applies local quality by customizing the height of each conductive member to match the height of its corresponding nanostructure. This ensures that both low and high nanostructures can make reliable contact with the mounting board, maintaining heat radiation efficiency while eliminating contact failures.
3Reliability
If conductive members are made with different heights to ensure stable contact, then connection stability is improved, but device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by applying local quality - each conductive member's height is locally optimized to match its corresponding nanostructure height. This targeted approach ensures connection stability without requiring complex overall structural changes, as each conductive member is independently sized according to its specific need.
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 enhances connection stability between the light emitting element and the mounting board, reduces the risk of contact failures, and achieves efficient light emission with reduced light diffusion and electrical shorts, enabling multicolor emission from a single substrate.
Implementation Method 1
a light emitting layer (126) disposed between the first semiconductor layer (124) and the second semiconductor layer (128)... the stacked body (120) includes a plurality of first columnar sections (102a), a plurality of second columnar sections (102b), and a plurality of third columnar sections (102c)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A light emitting device includes a light emitting element including a first base member, and a stacked body provided to the first base member, and a second base member provided with the light emitting element, the stacked body includes a first columnar section having a first height, and a second columnar section having a second height smaller than the first height, the first columnar section and the second base member are electrically connected to each other via a first conductive member between the stacked body and the second base member, the second columnar section and the second base member are electrically connected to each other via a second conductive member between the stacked body and the second base member, the first conductive member has a third height, and the second conductive member has a fourth height larger than the third height.