Light Source Layout With Shielded Conversion for Uniform Luminance
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Solution Overview
Problem
Conventional light sources with multiple light emitting elements face challenges in achieving uniform luminance during partial irradiation, leading to low luminance regions and luminance nonuniformity due to the arrangement of light emitting elements and wavelength conversion members.
Innovation Solution
A light source design featuring two-dimensionally arranged light emission units with a light shielding member between adjacent units, where the wavelength conversion member is larger than the light emitting element, and the light transmissive member has exposed lateral faces to reduce light leakage and enhance luminance uniformity, comprising a semiconductor light emitting element, wavelength conversion member, and light transmissive member with specific structural configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light emitting elements are arranged in an array for partial irradiation capability, then lighting flexibility is improved, but luminance uniformity deteriorates due to light leakage and low luminance regions between elements
Solution Approach 1:
A light shielding member is introduced as an intermediary element between adjacent light emitting elements. This member includes a light shielding portion that blocks lateral light leakage and a light transmissive portion that allows controlled light passage. By positioning this intermediary structure at specific locations (between adjacent elements and between wavelength conversion members), the patent effectively prevents unwanted light leakage while maintaining the partial irradiation capability, thus resolving the contradiction between lighting flexibility and luminance uniformity.
Solution Approach 2:
The light shielding member is designed with spatially varying properties: the light shielding portion has high light blocking capability at critical locations where light leakage occurs, while the light transmissive portion allows light passage in areas where uniformity is needed. Additionally, the size of wavelength conversion members varies depending on their distance from the center of the light source array, with peripheral members being larger to compensate for lower luminance. This local differentiation of structural properties enables simultaneous achievement of lighting flexibility and luminance uniformity.
2Volume of moving object
If wavelength conversion members are positioned close to light emitting elements for compact design, then device size is reduced, but light leakage increases causing luminance nonuniformity
Solution Approach 1:
The light shielding member serves as a mediator between the light emitting element and wavelength conversion member. Even when these components are positioned close together for compact design, the light shielding portion of the intermediary member prevents lateral light leakage from the light emitting element to adjacent wavelength conversion members. This maintains compact dimensions while preventing luminance nonuniformity that would otherwise result from light leakage.
3Illumination intensity
If light shielding member covers all lateral faces for maximum light control, then luminance uniformity is improved, but light output and efficiency deteriorate
Solution Approach 1:
The light shielding member is designed with non-uniform light shielding properties at different locations. The light shielding portion is positioned specifically at lateral faces where light leakage causes luminance nonuniformity, while the light transmissive portion is positioned where light passage is desirable. This selective, location-dependent shielding approach maximizes luminance uniformity improvement while minimizing light output loss, as opposed to uniform shielding across all surfaces.
Solution Approach 2:
Rather than implementing complete shielding of all lateral faces (excessive action), the patent applies partial shielding only where necessary to control light leakage between adjacent elements. The light transmissive portions are strategically positioned to allow beneficial light passage. This partial action approach achieves sufficient luminance uniformity improvement without the excessive light output loss that would result from complete shielding.
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 improved emission characteristics during partial irradiation by reducing low luminance regions and luminance nonuniformity, ensuring high contrast between lit and unlit areas, and maintaining high luminance uniformity across the light source.
Implementation Method 1
a wavelength conversion member disposed on the light emission face
Implementation Method 2
The light shielding member is continuously disposed between adjacent ones of the light emission units. The light shielding member covers a lateral face of the light emitting element and a lateral face of the wavelength conversion member
Data Source
AI summary
A light source includes first and second light emission units and a light shielding member. The light emission units each includes a light emitting element having a light emission face, a wavelength conversion member disposed on the light emission face, and a light transmissive member disposed on the wavelength conversion member. The light shielding member covers a lateral face of the light emitting element and a lateral face of the wavelength conversion member. The lateral face of the light transmissive member is at least partially exposed from the light shielding member. The second light emission unit is more distant from a center of a predetermined region than the first light emission unit. The light emission face of the light emitting element in the second light emission unit is larger than the light emission face of the light emitting element in the first light emission unit.