Surface Emitting Laser Device Crosstalk Reduction
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Solution Overview
Problem
Surface emitting laser devices face challenges in reducing crosstalk between light-emitting elements and forming dark lines between adjacent elements, while also requiring high heat dissipation performance due to increased heat generation compared to LEDs.
Innovation Solution
The device incorporates a wavelength converter with integrated wavelength conversion plates and a light absorption layer, along with a light reflection film, to minimize crosstalk and dark line formation, and utilizes a bonding metal layer and light reflection film for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If surface emitting laser elements are arranged in an array to save space, then device compactness is improved, but crosstalk of light between elements increases
Solution Approach 1:
A light absorption layer is introduced as an intermediary component between adjacent laser elements. This layer selectively absorbs stray light that would otherwise travel to neighboring elements, thereby reducing crosstalk while maintaining the compact array configuration.
Solution Approach 2:
The harmful stray light is extracted from the optical path by the light absorption layer, which removes the problematic light components before they can cause crosstalk between adjacent laser elements in the compact array.
2Volume of moving object
If surface emitting laser elements are arranged in an array to save space, then device compactness is improved, but dark line formation between elements increases
Solution Approach 1:
The light absorption layer acts as a mediator that manages light distribution in the regions between laser elements. By controlling light absorption and reflection, it prevents the formation of dark lines while maintaining the compact array structure.
3Power
If surface emitting laser elements are used instead of LEDs, then light emission capability is improved, but heat generation increases
Solution Approach 1:
The light absorption layer, which absorbs stray light that would otherwise cause crosstalk, also absorbs excess heat energy. This converts the harmful stray light into beneficial heat dissipation, simultaneously addressing both crosstalk reduction and thermal management.
4Object-generated harmful factors
If a light absorption layer is added to reduce crosstalk, then crosstalk reduction is improved, but device complexity increases
Solution Approach 1:
The light absorption layer performs multiple functions simultaneously: it reduces crosstalk between laser elements, prevents dark line formation, and aids in heat dissipation. This multi-functionality justifies the added component by delivering multiple benefits from a single structural addition.
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 significantly reduces crosstalk and dark line formation, achieving high contrast and uniform lighting while providing effective heat dissipation for reliable and long-lasting operation.
Implementation Method 1
a light absorption layer 17 formed on each of the light-emitting elements 12A and having an opening (light passage part) AP
Implementation Method 2
a light reflection film 19 formed on the light absorption layer 17
Implementation Method 3
a wavelength converter 13 provided on the light-emitting elements 12A and including a plurality of wavelength conversion plates 13A
Implementation Method 4
a bonding metal layer 18 formed on the light reflection film 19
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
Provided is a surface emitting laser device (10) including a plurality of surface emitting laser elements (12A) and capable of significantly reducing the crosstalk of light and the formation of a dark line. The surface emitting laser device includes: a mounting substrate (11); a surface emitting laser array (12) including a plurality of surface emitting laser elements (12A) arranged side by side on the mounting substrate; a plurality of light absorption layers (17) formed on the plurality of surface emitting laser elements, respectively, and each including an opening (AP); and a plurality of wavelength conversion plates (13A) formed on the plurality of light absorption layers, respectively, and each including a fluorescent plate (PL) and a light reflection film (RF) covering a side surface of the fluorescent plate. The absorption layer (17) may include an antireflection layer (17A) at an interface with the surface emitting laser element.