Wavelength Conversion Layout for Uniform Light-Emitting Devices
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Solution Overview
Problem
Existing light-emitting devices suffer from luminance and color unevenness due to inefficient wavelength conversion and exposure of wavelength conversion members to atmospheric elements, leading to degradation and reduced efficiency.
Innovation Solution
A light-emitting device design featuring a wavelength conversion member contained within a transparent member, surrounded by a wall member, where the conversion member's region overlaps with the wall member's region in the thickness direction, ensuring protection from oxygen and moisture while enhancing thermal dissipation and reducing gaps for improved conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wavelength conversion member is exposed to the external atmosphere, then the device structure is simpler, but the wavelength conversion member degrades due to oxygen and moisture
Solution Approach 1:
The wavelength conversion member is encapsulated within the transparent member, creating a nested structure where the conversion member is protected inside the protective housing. This resolves the contradiction by maintaining structural simplicity while preventing direct exposure to degrading atmospheric elements.
Solution Approach 2:
The transparent member creates a sealed environment around the wavelength conversion member, isolating it from oxygen and moisture in the external atmosphere. This inert environment prevents degradation while maintaining overall device simplicity.
2Area of stationary object
If the wavelength conversion member region is smaller than the wall member region, then the device size is reduced, but conversion efficiency decreases due to light leakage
Solution Approach 1:
The patent extends the wavelength conversion member beyond the wall member boundaries in the planar dimension while maintaining overlap in the thickness direction. This dimensional approach allows the conversion member to capture all incident light without increasing the overall device footprint, resolving the contradiction between size and efficiency.
Solution Approach 2:
The wavelength conversion member has non-uniform spatial distribution, being concentrated over the light source region while extending beyond the wall member boundaries. This local quality optimization ensures complete light capture for conversion while maintaining compact device dimensions.
3Ease of manufacture
If gaps are present between the wall member and wavelength conversion member, then assembly is easier, but luminance unevenness increases
Solution Approach 1:
The patent ensures overlap between the wall member and wavelength conversion member in the thickness direction, using the vertical dimension to eliminate gaps that would otherwise exist in the planar view. This resolves the contradiction by maintaining assembly ease while achieving luminance uniformity through three-dimensional positioning.
Solution Approach 2:
The wavelength conversion member is positioned to overlap and extend beyond the wall member boundaries, creating a nested configuration that eliminates gaps. This nested arrangement ensures uniform light conversion across the entire emission area while maintaining manufacturing simplicity.
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 suppresses deterioration of the wavelength conversion member, improves conversion efficiency, and achieves uniform light emission with reduced luminance and color unevenness, enhancing display performance and illumination uniformity.
Implementation Method 1
The wavelength conversion member converts first wavelength light from the light source to second wavelength light
Implementation Method 2
The transparent member contains therein the wavelength conversion member
Implementation Method 3
a region occupied by the wavelength conversion member is wider than a region surrounded by the wall member, and entirely overlaps with the region surrounded by the wall member in the thickness direction
Data Source
AI summary
Provided is a light-emitting device that makes it possible to emit, with high efficiency, light having higher uniformity. The light-emitting device includes a light source, a wavelength conversion unit, and a wall member. The light source is disposed on a substrate. The wavelength conversion unit includes a wavelength conversion member and a transparent member that contains the wavelength conversion member therein. The wavelength conversion member is disposed to face the light source in a thickness direction and converts first wavelength light from the light source to second wavelength light. The wall member is provided on a substrate and surrounds the light source in a plane that is orthogonal to the thickness direction. A region occupied by the wavelength conversion member is wider than a region surrounded by the wall member, and entirely overlaps with the region surrounded by the wall member in the thickness direction.