VCSEL Light-Emitting Structure With Vertical Conductive Stacking
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Solution Overview
Problem
There is a demand for reducing the size of light-emitting devices that incorporate surface emitting laser elements, such as VCSEL elements.
Innovation Solution
A light-emitting device configuration that includes a substrate, a light-transmissive member, surface emitting laser elements configured for top emission, and an intermediate conductive component. The substrate has conductive members, and the light-transmissive member includes conductive members electrically connected to the intermediate conductive component, allowing for efficient power supply to the laser elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional light-emitting device structure is used, then the device can provide stable laser emission, but the device size cannot be reduced
Solution Approach 1:
The patent merges the substrate and support function into a single integrated structure. The substrate serves both as the mounting platform for laser elements and as the support structure, eliminating the need for separate support components and reducing overall device size while maintaining structural stability
Solution Approach 2:
The patent transitions from a conventional planar arrangement to a three-dimensional stacked configuration. Multiple laser elements are arranged in layers above the substrate, with conductive members extending vertically to provide electrical connections. This vertical stacking enables compact size reduction in the horizontal plane while maintaining all necessary functional connections
2Volume of moving object
If the device size is reduced, then the Z-direction dimension decreases, but the power supply path length increases
Solution Approach 1:
The conductive members are configured to extend in the Z-direction (vertical direction) from the substrate upward to the laser elements. This vertical arrangement allows the power supply path to follow the shortest distance in three-dimensional space, enabling compact Z-direction dimensioning without excessively lengthening the electrical connection paths
Solution Approach 2:
The conductive members are positioned locally optimized for each laser element, with conductive portions extending from the substrate to specific laser element locations. This localized conductive structure minimizes the power supply path length for each element while maintaining the overall compact device dimensions
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
This configuration enables a reduction in the size of the light-emitting device, particularly in the Z direction, while maintaining effective power supply and light emission.
Implementation Method 1
a plurality of surface emitting laser elements disposed between the upper surface of the substrate and the lower surface of the light-transmissive member, the surface emitting laser elements being configured to perform top emission
Implementation Method 2
The light-transmissive member includes a third conductive member electrically connected to the first conductive member by the intermediate conductive component
Data Source
AI summary
A light-emitting device includes: a substrate having an upper surface; a light-transmissive member having a lower surface facing the upper surface of the substrate; a plurality of surface emitting laser elements disposed between the upper surface of the substrate and the lower surface of the light-transmissive member, the surface emitting laser elements being configured to perform top emission; and an intermediate conductive component disposed between the upper surface of the substrate and the lower surface of the light-transmissive member. The substrate includes a first conductive member and a second conductive member. The light-transmissive member includes a third conductive member electrically connected to the first conductive member by the intermediate conductive component. The plurality of surface emitting laser elements include a first laser element electrically connected to the third conductive member, and a second laser element electrically connected to the second conductive member.