Phosphor Substrate Layout for LED Color Tuning and Warpage Control
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Solution Overview
Problem
The existing LED lighting devices cannot adjust the emitted light color using a reflective material and lack clarity on the substrate's rear surface configuration, leading to issues with light emission efficiency and potential warpage due to heat generation.
Innovation Solution
A phosphor substrate with a phosphor layer on one surface and a second electrode group on the other, where the phosphor layer's light emission peak wavelength is in the visible region, and the second electrode group forms a pattern that overlaps significantly with the first electrode group, helping to stabilize light emission and reduce warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reflective material is provided on the substrate surface to improve light emitting efficiency, then light emission efficiency is improved, but the ability to adjust light emission color is lost
Solution Approach 1:
The patent applies parameter changes by using a phosphor layer with specific light emission peak wavelengths (560-680nm) to convert the light emission color from the LED element. By selecting phosphors with different emission characteristics, the light color can be adjusted while maintaining high emission efficiency through the optical coupling structure.
2Power
If light emitting elements are mounted on one surface of the substrate, then light emission function is achieved, but warpage occurs due to heat generation
Solution Approach 1:
The patent applies asymmetry by providing electrode groups on both the front and back surfaces of the substrate. The first electrode group on the front surface and the second electrode group on the back surface create a balanced electrical and thermal structure that compensates for warpage caused by heat generation from the light emitting elements.
Solution Approach 2:
The patent addresses thermal expansion effects by distributing electrode groups on both surfaces of the substrate. This configuration helps manage thermal stress and prevents warpage by creating a more uniform thermal distribution and structural balance across the substrate thickness.
3Ease of manufacture
If the rear surface configuration of the substrate is not clearly defined, then manufacturing simplicity is maintained, but light emission stability is compromised
Solution Approach 1:
The patent applies universality by designing the second electrode group on the back surface to serve multiple functions: electrical connection, heat dissipation, and structural support. This configuration can be applied to various LED types and substrate materials, providing stable light emission while maintaining manufacturing feasibility.
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 allows for adjustable light emission color and improved stability by suppressing warpage, enhancing light emission efficiency and heat dissipation in LED lighting devices.
Implementation Method 1
a phosphor layer which is disposed on one surface of the insulating substrate and includes a phosphor in which a light emission peak wavelength, in a case where light emitted by light emitting element is used as excitation light, is in a visible light region
Data Source
AI summary
A phosphor substrate of the present invention is a phosphor substrate having a plurality of light emitting elements mounted on one surface, and includes an insulating substrate, a first electrode group which is disposed on one surface of the insulating substrate and includes a plurality of electrodes bonded to the plurality of light emitting elements, a phosphor layer which is disposed on one surface of the insulating substrate and includes a phosphor in which a light emission peak wavelength, in a case where light emitted by light emitting element is used as excitation light, is in a visible light region, and a second electrode group which is disposed on the other surface of the insulating substrate and includes a plurality of electrodes.