Light Source Die Wavelength Conversion for Reduced Light Loss
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Solution Overview
Problem
Conventional light-emitting devices used in flashes suffer from significant light loss due to the thickness of wavelength-converting materials required to convert narrow banded light into broad spectrum white light, which also increases the form factor and power consumption, making them less suitable for applications beyond their primary use.
Innovation Solution
A light-emitting device design utilizing a thin layer of wavelength-converting material coated directly on the light source die and an encapsulation layer formed using a group casting method, which minimizes light loss and reduces the overall thickness, enabling a smaller form factor suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a thick layer of wavelength-converting material is used to convert narrow banded light into broad spectrum white light, then the conversion efficiency is improved, but light loss increases and form factor increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the wavelength-converting material by using quantum dots with precisely controlled sizes (2-50 nm) to achieve the desired wavelength conversion. By adjusting the quantum dot size parameter, the conversion efficiency is optimized while maintaining a thin layer thickness, thus reducing light loss without increasing form factor.
Solution Approach 2:
The patent employs a composite structure combining the light source die with a thin layer of wavelength-converting material containing quantum dots suspended in a matrix material. This composite approach enables effective wavelength conversion in a thin layer, minimizing light loss while maintaining compact form factor.
2Loss of energy
If a thick layer of wavelength-converting material is used, then the conversion efficiency is improved, but power consumption increases
Solution Approach 1:
The patent optimizes the thickness parameter of the wavelength-converting material layer to be thin, which reduces the amount of material that absorbs light. This parameter change directly reduces power consumption while maintaining conversion efficiency through the use of high-performance quantum dot materials with precise size control.
3Length of stationary object
If a thin layer of wavelength-converting material is used, then the form factor is reduced, but conversion efficiency decreases
Solution Approach 1:
The patent achieves high conversion efficiency in a thin layer by changing the material parameters - specifically using quantum dots with optimized size (2-50 nm) and composition. These parameter changes enable the quantum dots to absorb and re-emit light efficiently even in a thin configuration, maintaining high conversion efficiency while reducing form factor.
Solution Approach 2:
The patent implements a thin film structure for the wavelength-converting material layer, which allows the device to achieve compact form factor. The thin film contains quantum dots that maintain high conversion efficiency despite the reduced thickness, effectively decoupling form factor reduction from conversion efficiency loss.
4Length of stationary object
If a thin layer of wavelength-converting material is used, then the form factor is reduced, but power consumption increases
Solution Approach 1:
The patent optimizes multiple parameters simultaneously - the quantum dot size (2-50 nm), the matrix material composition, and the layer thickness - to achieve a configuration that consumes less power. The parameter changes enable high quantum efficiency in a thin layer, reducing the energy required for wavelength conversion while maintaining compact form factor.
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 solution significantly reduces light loss and minimizes the form factor of light-emitting devices, making them more versatile and efficient for applications such as mobile devices and infotainment displays while maintaining reliability and heat dissipation capabilities.
Implementation Method 1
The output of the light source die is then typically converted to a broad spectrum white light by means of a wavelength-converting material. One example of a wavelength-converting material is phosphor.
Implementation Method 2
The wavelength-converting material may absorb a portion of light, resulting in light loss.
Data Source
AI summary
A light-emitting device having a light source die mounted within an aperture is disclosed. The aperture is covered by a die attach pad on one side. The light source die is mounted on a die attach pad within the aperture. In one embodiment, an optical coupling layer can be formed within an aperture encapsulating a light source die. A wavelength converting layer can be formed on the substrate above the optical coupling layer. The wavelength converting layer can comprise a high density layer and a low density layer. The high density layer can comprise wavelength-converting material precipitated on one side of the wavelength converting layer. The low density layer can comprise the wavelength-converting material in particle form suspended within the wavelength converting layer. In one embodiment, the wavelength converting layer may be confined within the aperture of the substrate.