Wavelength-Converting Device Groove Thermal Management
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Solution Overview
Problem
High-cost high-brightness red and green laser diodes in projection apparatuses, necessitating the use of a blue laser diode to excite phosphor powder for wavelength conversion, which poses challenges in thermal conductivity and reliability.
Innovation Solution
A wavelength-converting device with an annular portion featuring a groove and heat-conductive bonding medium, enhancing thermal conductivity and reliability by increasing the bonding area between the wavelength-converting layer and the reflective layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a blue laser diode is used to excite phosphor powder for wavelength conversion, then cost is reduced, but thermal conductivity and reliability deteriorate
Solution Approach 1:
The patent introduces a groove structure in the wavelength-converting portion, transforming the flat bonding interface into a three-dimensional structure. This dimensional change increases the bonding area between the wavelength-converting layer and reflective layer, thereby improving thermal conductivity and reliability while maintaining cost effectiveness
Solution Approach 2:
The wavelength-converting portion is segmented by introducing a groove that divides the bonding interface into multiple surfaces. This segmentation increases the total bonding area and improves heat dissipation pathways, resolving the thermal conductivity issue while keeping the cost-effective blue laser diode configuration
2Reliability
If the bonding area between wavelength-converting layer and reflective layer is increased, then thermal conductivity improves, but device complexity increases
Solution Approach 1:
The groove structure serves multiple functions simultaneously: it increases bonding area for improved thermal conductivity, provides mechanical interlocking for enhanced reliability, and maintains a relatively simple overall device structure. This multi-functionality approach improves thermal performance without proportionally increasing device complexity
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
Improves conversion efficiency and extends the service life of the wavelength-converting device by effectively managing heat and preventing damage from excessive heat.
Implementation Method 1
The use of different forms, different positions, or different compositions of the heat-conductive bonding medium can effectively increase the bonding area between the wavelength-converting layer and the reflective layer and the heat conductive speed, thereby improving the heat conductivity and reliability
Implementation Method 2
The wavelength-converting layer is adapted to convert the exciting beam into a converted beam
Data Source
AI summary
A wavelength-converting device has a light incident side. The wavelength-converting device includes an inner annular portion and an annular portion. The annular portion is connected to an outer edge of the inner annular portion. The annular portion includes a wavelength-converting portion, a first heat-conductive bonding medium, a reflective layer, and a wavelength-converting layer. A groove is annularly disposed in the wavelength-converting portion, and the groove is recessed from the light incident side of the wavelength-converting device. The first heat-conductive bonding medium is disposed in the groove. The reflective layer is disposed on the first heat-conductive bonding medium. The wavelength-converting layer is disposed on the reflective layer and has a light receiving surface. A projection apparatus is also provided.