3D Stacked Semiconductor Laser Light Emitting Device
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Solution Overview
Problem
Conventional light emitting devices with multiple semiconductor laser elements arranged on a flat surface suffer from low luminance due to the large area of the light exit surface, which increases the total area and decreases luminance.
Innovation Solution
A light emitting device configuration where the first semiconductor laser element is positioned farther than the second semiconductor laser element from the light exit surface, with a housing that includes mirror surfaces and a wavelength conversion unit to scatter and direct laser beams, ensuring high luminance and miniaturization by optimizing the light extraction direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple semiconductor laser elements are arranged on a flat surface to increase light output, then the total light intensity increases, but the light exit surface area increases causing luminance to decrease
Solution Approach 1:
The patent transitions from a two-dimensional flat surface arrangement to a three-dimensional stacked configuration. Multiple semiconductor laser elements are arranged in different layers at different distances from the light exit surface, allowing light collection from multiple depth positions while maintaining a compact light exit area, thus resolving the contradiction between total light intensity and luminance
2Power
If multiple semiconductor laser elements are arranged on a flat surface, then more light sources are available, but the device area increases preventing miniaturization
Solution Approach 1:
The invention utilizes the third dimension (depth/distance from light exit surface) to arrange multiple laser elements. Elements are positioned at different distances (e.g., first element at distance d1, second element at distance d2 where d1 ≠ d2), enabling multiple light sources within a compact footprint and achieving device miniaturization while maintaining high light output capability
3Ease of operation
If light is collected from multiple elements on a flat surface to a diffusion member, then light distribution is improved, but the light exit surface area still increases reducing luminance
Solution Approach 1:
Instead of arranging elements horizontally on a flat surface, the patent positions them vertically at different distances from the light exit surface. This stacked arrangement allows the diffusion member to collect light from multiple depth positions, achieving good light distribution while keeping the light exit surface area small and luminance high
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 configuration results in a light emitting device with approximately twice the normal light intensity, achieving high luminance and miniaturization by reducing the light exit surface area while ensuring safety and efficient light distribution.
Implementation Method 1
a wavelength conversion unit (150) which converts a wavelength of the laser beam
Implementation Method 2
a scattering unit (160) which scatters the laser beam
Implementation Method 3
a housing (110) that includes mirror surfaces
Data Source
AI summary
A light emitting device includes: a first semiconductor laser element; a second semiconductor laser element; and a light exit surface which emits light from the first semiconductor laser element and the second semiconductor laser element. The first semiconductor laser element is disposed at a position farther than the second semiconductor laser element as seen from a flat surface including a point on a surface of the light exit surface and perpendicular to a light extraction direction.