Light-emitting device with light-blocking layer for luminance and reliability
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Solution Overview
Problem
Current light-emitting devices face challenges in achieving high luminance and reliability, with existing solutions not adequately addressing these demands.
Innovation Solution
A light-emitting device structure incorporating a light-emitting element, a light-transmissive member, a light-blocking layer, and a light-reflective member, where the light-transmissive member has a smaller main surface area than the light-emitting surface, and the light-blocking layer covers the region between the light-emitting surface and the light-transmissive member's edge, while the light-reflective member covers lateral surfaces to enhance luminance and reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of the light-emitting surface is reduced to enhance luminance, then luminance is improved, but light leakage increases and reliability deteriorates
Solution Approach 1:
The patent segments the light-emitting device into distinct functional zones: a light-emitting region with reduced area for high luminance, and a light-blocking region with reflective members to contain and redirect light. This segmentation allows the light-emitting surface to be small for high luminance while the surrounding blocking structure prevents light leakage, resolving the contradiction between luminance enhancement and reliability maintenance.
Solution Approach 2:
The patent introduces a light-blocking layer with reflective members as an intermediary structure between the light-emitting element and the external environment. This intermediary blocks stray light from escaping while reflecting it back toward the light-emitting surface, thereby preventing light leakage without affecting the high luminance output of the reduced-area light-emitting surface.
2Reliability
If a light-blocking layer is added to prevent light leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the light-blocking layer: it simultaneously blocks stray light, reflects light back to the emitting surface, and structurally supports the light-transmissive member. By combining light-blocking, light-reflecting, and structural support functions into a single integrated layer, the patent prevents light leakage while minimizing the increase in device complexity.
Solution Approach 2:
The light-blocking layer serves multiple purposes: it acts as a light barrier to prevent leakage, a reflective surface to enhance luminance, and a structural element to support the overall device architecture. This multi-functionality allows the patent to improve reliability through light leakage prevention without proportionally increasing device complexity, as one component performs multiple critical roles.
3Illumination intensity
If the light-transmissive member area is reduced for high luminance, then luminance is improved, but light leakage control becomes more difficult
Solution Approach 1:
The patent addresses light leakage control by extending the solution from the two-dimensional light-emitting surface into the third dimension with the light-blocking layer that has a specific thickness and extends laterally beyond the light-transmissive member. This dimensional extension creates a volumetric light-blocking structure that effectively contains stray light without requiring the light-transmissive member area to be large, thus maintaining high luminance while controlling light leakage.
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 proposed structure achieves higher luminance and improved reliability by minimizing light leakage and protecting the light-reflective member from deterioration, resulting in a clear luminance difference and reduced emission color non-uniformity.
Implementation Method 1
a light-reflective member covering at least a portion of lateral surfaces of the light-emitting element and at least a portion of the light-transmissive member
Implementation Method 2
The light-blocking layer is disposed on the light-emitting surface to cover a region between an outer edge of the light-emitting surface and an outer edge of the first main surface
Data Source
AI summary
The light-emitting device includes a light-emitting element, a light-transmissive member, a light-blocking layer and a light-reflective member. The light-transmissive member has a first main surface and a second main surface opposite to each other. The first main surface and the second main surface are smaller than a light-emitting surface of the light-emitting element. The first main surface faces the light-emitting surface of the light-emitting element. The light-blocking layer is disposed on the light-emitting surface to cover a region between an outer edge of the light-emitting surface and an outer edge of the first main surface. The light-reflective member covers at least a portion of lateral surfaces of the light-emitting element and at least a portion of the light-transmissive member. The light-blocking layer extends inward of the outer edge of the first main surface.