Light-emitting Device Rectangular Cross-section High Luminance
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Solution Overview
Problem
Existing light-emitting devices for vehicle lamps, such as headlights, do not effectively create a high luminance region in the light-emitting surface, which is necessary for optimal light distribution and visibility.
Innovation Solution
A light-emitting device comprising a light-emitting element, a light-transmissive member, and a first light adjustment member, where the light-emitting element has a support substrate with a light-emitting portion including a semiconductor layered body, the light-transmissive member has distinct upper and lateral surfaces, and the first light adjustment member exposes the upper surface of the light-transmissive member while covering the second upper surface and first lateral surface, collectively defining a rectangular cross-sectional shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light-emitting device structure is used, then the device is simple in structure, but it cannot create a high luminance region in the light-emitting surface
Solution Approach 1:
The light-emitting surface is divided into multiple regions with different luminance characteristics by using a light-transmissive member with varying thickness. The member creates a first light-emitting region with higher luminance and a second light-emitting region with lower luminance, achieving segmented illumination without complex optical components.
Solution Approach 2:
The patent introduces a thickness dimension to the light-transmissive member to control light emission. By varying the thickness of the light-transmissive member in the vertical dimension, different luminance regions are created in the horizontal plane, transforming a one-dimensional thickness variation into two-dimensional luminance distribution.
2Illumination intensity
If multiple light-emitting elements with different areas are combined, then light distribution suitable for headlight is achieved, but the device complexity increases
Solution Approach 1:
The light-transmissive member serves multiple functions simultaneously: it acts as a structural support, a light guide, and a luminance control element. By varying its thickness, it creates different luminance regions and achieves headlight-appropriate light distribution without requiring separate optical components for each function.
Solution Approach 2:
The patent merges the functions of multiple light-emitting elements into a single light-emitting element with a uniform light-emitting surface. The differentiation in luminance regions is achieved through the light-transmissive member rather than through multiple elements, simplifying the overall structure while maintaining the desired light distribution pattern.
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 device achieves a high luminance region in the light-emitting surface, enabling improved light distribution and visibility, particularly suitable for vehicle headlights, while reducing the complexity of optical designs.
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
Data Source
AI summary
A light-emitting device includes a light-emitting element, a light-transmissive member, and a first light adjustment member. The light-transmissive member has a first upper surface, a second upper surface, a lower surface facing a first surface of a support substrate of the light-emitting element, a first lateral surface contiguous with the first upper surface and the second upper surface, a second lateral surface contiguous with the second upper surface and the lower surface, and a third lateral surface contiguous with the first upper surface and the lower surface. The first light adjustment member exposes the first upper surface of the light-transmissive member and covers the second upper surface and the first lateral surface of the light-transmissive member. The light-transmissive member and the first light adjustment member collectively define a rectangular cross-sectional shape.