Light-Emitting Structure With Local High-Luminance Light Shaping
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Solution Overview
Problem
Current light-emitting devices for vehicle lamps, such as headlights, lack a high luminance region configuration that effectively balances light distribution and efficiency, often requiring complex optical designs like reflectors and lenses to achieve desired light patterns.
Innovation Solution
A light-emitting device design featuring a support substrate with a semiconductor layered body and a light-transmissive member with distinct upper surfaces and lateral surfaces, where a light adjustment member creates a high luminance region by varying the thickness and phosphor concentration across the light-emitting surface, allowing for a high luminance area within the light-emitting surface without complex optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If complex optical designs like reflectors and lenses are used to achieve desired light patterns, then light distribution is improved, but device complexity increases
Solution Approach 1:
The patent extracts the optical control function from separate components (reflectors and lenses) and integrates it directly into the light-emitting element structure. The semiconductor layered body is designed with specific geometries and phosphor distributions that inherently guide and shape light output, eliminating the need for additional optical components while maintaining effective light distribution.
Solution Approach 2:
The patent merges the light generation and light shaping functions into a single integrated structure. The semiconductor layered body combines the light-emitting semiconductor layers with phosphor conversion layers and geometric features that control light distribution, creating a unified component that performs both illumination and optical control without requiring separate reflectors or lenses.
2Use of energy by moving object
If multiple optical components are added to create high luminance regions, then light efficiency is improved, but device size increases
Solution Approach 1:
The patent applies local quality by varying the phosphor concentration and semiconductor layer characteristics in different regions of the light-emitting element. Specific areas have higher phosphor concentrations or different semiconductor compositions to create localized high luminance regions, while other areas have different properties, all within a single compact structure without requiring multiple separate optical components.
Solution Approach 2:
The patent utilizes the vertical dimension within the semiconductor layered body to control light efficiency. By adjusting layer thicknesses, phosphor distributions, and semiconductor layer configurations in the vertical direction, the device creates effective light output patterns and high luminance regions without increasing the horizontal footprint or overall 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 design achieves a high luminance region with improved light distribution and reduced size, enhancing the design of vehicle headlights by maintaining efficiency and simplifying the optical structure.
Implementation Method 1
a light-emitting portion located on the second surface of the support substrate and including a semiconductor layered body including a first semiconductor layer, a light-emitting layer and a second semiconductor layer in this sequence
Implementation Method 2
The light-transmissive member has a first upper surface, a second upper surface, a lower surface located on a side opposite to the first upper surface and the second upper surface
Implementation Method 3
The light-transmissive member has a thickness from the lower surface to the first upper surface larger than a thickness from the lower surface to the second upper surface
Data Source
Figure 1A
Figure 1B~1C
Figure 1D
AI summary
A light-emitting device includes a light-emitting element, a light-transmissive member, and a light adjustment member. The light adjustment member exposes a first upper surface and covers a second upper surface and a first lateral surface of the light-transmissive member. The light-transmissive member has a thickness from a lower surface to the first upper surface larger than a thickness from the lower surface to the second upper surface. In a plan view, first and second light-emitting regions have the first and second upper surfaces of the light-transmissive member, respectively, and an area of the second light-emitting region is in a range from 35% to 95% of an area of a light-emitting region. A boundary between the first and second light-emitting regions includes first and second points on a perimeter of a light-emitting region, and a straight line connecting the first and second points extends across the light-emitting region.