Light Source Device Transparent Conductive Oxide Layer
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Solution Overview
Problem
Existing light source devices face issues with reduced light extraction efficiency and increased size due to the presence of a metal layer between light emitting elements and phosphors, leading to color unevenness and adhesion layers that further reduce efficiency.
Innovation Solution
A light source device incorporating a driving circuit with group III nitride semiconductor light emitting elements, a color conversion layer in direct contact with the light outgoing surface, and optionally a color filter layer, which enhances light extraction efficiency and emission uniformity by eliminating the need for a metal layer and adhesion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is placed between light emitting element and phosphor, then electrical connection is achieved, but light extraction efficiency is reduced and device size increases
Solution Approach 1:
The patent introduces a transparent conductive oxide layer as an intermediary between the light emitting element and phosphor. This mediator provides both electrical connection and optical transparency, resolving the contradiction between achieving electrical connection and maintaining light extraction efficiency. The transparent conductive oxide layer allows light to pass through while providing the necessary electrical pathway.
Solution Approach 2:
The patent replaces the traditional metal layer (mechanical/electrical connection method) with a transparent conductive oxide layer. This substitution eliminates the optical interference caused by metal while maintaining electrical connectivity, thereby improving light extraction efficiency without compromising electrical connection reliability.
2Reliability
If a metal layer is placed between light emitting element and phosphor, then electrical connection is achieved, but device size increases
Solution Approach 1:
The transparent conductive oxide layer serves as a thin intermediary film that provides electrical connection without adding significant thickness. Compared to traditional metal layer structures, this intermediary layer achieves the same electrical function with minimal impact on overall device size.
3Strength
If adhesion layer is formed between light emitting element and light-transmitting member, then bonding is achieved, but light extraction efficiency is reduced
Solution Approach 1:
The patent uses a transparent conductive oxide layer as an intermediary that provides both adhesion and optical transparency. This mediator enables bonding between the light emitting element and light-transmitting member while maintaining high light extraction efficiency, unlike traditional adhesion layers that block light.
Solution Approach 2:
The patent employs composite material structures where the transparent conductive oxide layer is integrated with the light emitting element and light-transmitting member. This composite approach achieves both mechanical bonding and optical transparency simultaneously, resolving the contradiction between adhesion strength and light extraction efficiency.
4Strength
If adhesion layer is formed between light emitting element and light-transmitting member, then bonding is achieved, but device size increases
Solution Approach 1:
The transparent conductive oxide layer is integrated as part of the composite structure, providing adhesion functionality without requiring separate thick adhesion layers. This composite material approach achieves bonding strength while minimizing the increase in device size.
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 solution increases light extraction efficiency and emission uniformity while reducing the overall size of the light source device, addressing color unevenness and enhancing heat dissipation and mechanical properties.
Implementation Method 1
a color conversion layer which is in contact with the light outgoing surface and converts a wavelength of light emitted from the light outgoing surface
Implementation Method 2
a phosphor layer which is in contact with the light outgoing surface and converts a wavelength of light emitted from the light outgoing surface
Data Source
AI summary
A light source device includes: a driving circuit; a blue light emitting element made of a group III nitride semiconductor which has a light outgoing surface on a side opposite to a side with the driving circuit, is arranged on the driving circuit, and is electrically connected to the driving circuit; and a color conversion layer which is in contact with the light outgoing surface and converts a wavelength of light emitted from the light outgoing surface. The light outgoing surface is made of a group III nitride semiconductor.