Wavelength-Conversion LED Structure for Wider Light Distribution
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Solution Overview
Problem
Conventional light-emitting devices often have limited light distribution characteristics, leading to uneven luminance and potential brightness issues in lighting fixtures, which can result in thicker and heavier fixtures to mitigate these problems.
Innovation Solution
A light-emitting device design featuring a light-emitting element with a wavelength conversion member and a light-transmissive member, where the light-transmissive member's thickness is greater than the wavelength conversion member's, allowing for wider light distribution characteristics with peaks at various angles, reducing luminance unevenness and chromaticity deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting device structures are used, then the device can be manufactured with standard components, but the light distribution characteristics are limited and luminance unevenness occurs
Solution Approach 1:
The patent applies dimensionality change by making the light-transmissive member thicker than the wavelength conversion member, creating a protruding structure that emits light from multiple surfaces (top and lateral sides). This three-dimensional light emission geometry fundamentally changes the light distribution pattern from conventional two-dimensional emission, achieving wider angular distribution and reduced luminance unevenness without requiring complex optical systems
2Illumination intensity
If thicker lighting fixtures are used to mitigate luminance unevenness, then lighting uniformity improves, but the fixture weight and size increase
Solution Approach 1:
The patent changes the thickness parameter of the light-transmissive member relative to the wavelength conversion member, creating a specific geometric configuration where the light-transmissive member protrudes. This parameter change enables the light to distribute over a wider solid angle, achieving uniform illuminance on the working plane without increasing the overall fixture size or weight, as the light propagation geometry is optimized at the component level
3Illumination intensity
If the light-transmissive member thickness is greater than the wavelength conversion member thickness, then wider light distribution is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a quantitative parameter relationship (light-transmissive member thickness > wavelength conversion member thickness) that creates a self-aligning geometric structure. This parameter setting establishes a clear manufacturing target and tolerance range, making the wider light distribution characteristic achievable through standard manufacturing processes without requiring ultra-precise thickness control, as the effect is robust within reasonable tolerance bands
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 achieves wider light distribution characteristics, reducing luminance unevenness and chromaticity deviations, enabling thinner and lighter lighting fixtures with improved luminous flux and reduced positional deviations between components.
Implementation Method 1
a wavelength conversion member disposed on an upper surface and a lateral surface of the element portion
Implementation Method 2
a light-transmissive member disposed on an upper surface of the wavelength conversion member and including a light-diffusing material
Implementation Method 3
a light reflective member disposed on the lower surface of the element portion and a lower surface of the wavelength conversion member
Data Source
AI summary
The light-emitting device includes a light-emitting element including an element portion, and an electrode disposed on a lower surface of the element portion, a wavelength conversion member disposed on an upper surface and a lateral surface of the element portion, a light-transmissive member disposed on an upper surface of the wavelength conversion member, and a light reflective member disposed on the lower surface of the element portion and a lower surface of the wavelength conversion member. A lateral surface of the wavelength conversion member is exposed from the light-transmissive member, and a thickness of the light-transmissive member is larger than a thickness of the wavelength conversion member.