Wavelength Converter Layout for High-Luminance LED Light Sources
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Solution Overview
Problem
Current light-emitting diode (LED) systems face challenges in optimizing the dimensions of wavelength converting structures and semiconductor structures to achieve higher luminance and smaller form factors, particularly in applications requiring high brightness and compact size.
Innovation Solution
The design involves a light-emitting device with a wavelength converting structure that is smaller or larger than the semiconductor structure in specific dimensions, accompanied by optical extraction features to enhance light output, allowing for the decoupling of dimensions and increased luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the wavelength converting structure is made larger to increase light output, then the luminance is improved, but the form factor increases
Solution Approach 1:
The patent decouples the dimensional relationships between the semiconductor structure and wavelength converting structure, allowing the converter to extend beyond the semiconductor in the first dimension while the semiconductor extends beyond the converter in the second dimension. This asymmetric dimensional arrangement enables increased light output in one direction without proportionally increasing the overall form factor in all directions.
Solution Approach 2:
The patent applies different dimensional relationships in different spatial dimensions. The wavelength converting structure is larger than the semiconductor structure in the first dimension to maximize light extraction in that direction, while the semiconductor structure extends beyond the converter in the second dimension to maintain a compact overall form factor. This localized optimization of dimensional relationships resolves the contradiction between luminance and form factor.
2Illumination intensity
If the light emitting area is increased to achieve higher luminance, then the brightness is improved, but the device size increases
Solution Approach 1:
The patent utilizes asymmetric dimensional extension where the wavelength converting structure protrudes beyond the semiconductor structure in the first dimension, creating an optimized light emitting area without proportionally increasing the overall device volume. This dimensional decoupling allows brightness enhancement while maintaining compact device size.
3Illumination intensity
If the wavelength converting structure extends beyond the semiconductor structure to improve light extraction, then the luminance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent implements asymmetric dimensional extension only where needed for optimal light extraction, rather than requiring complex three-dimensional arrangements throughout. The wavelength converting structure extends beyond the semiconductor in the first dimension while the semiconductor extends beyond the converter in the second dimension, creating a manageable manufacturing complexity while achieving improved luminance.
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 enables the creation of high aspect ratio light sources with improved luminance and compact size, suitable for applications such as automotive lighting, camera flashes, and stage lighting, by optimizing the light-emitting area and die size of LEDs.
Implementation Method 1
Photons of blue light emitted by the light emitting semiconductor structure may either pass through the yellow emitting phosphor layer as blue photons or may be converted into yellow photons by the yellow emitting phosphor layer. The blue and yellow photons that are ultimately emitted out of the LED combine to make the light emitted from the LED appear white to the viewer.
Data Source
AI summary
A light emitting device having first, second and third dimensions that are orthogonal may include a light emitting semiconductor device configured to emit light via a first surface in a plane formed by the first and second dimensions. The light emitting device may further include a wavelength converting structure disposed on the first surface of the light emitting semiconductor device, the wavelength converting structure extending beyond the light emitting semiconductor device in the first dimension and the light emitting semiconductor device extending beyond the wavelength converting structure in the second dimension. The light emitting device may further include one or more optical extraction features in at least one gap formed by the wavelength converting structure extending beyond the light emitting semiconductor structure in the first dimension and/or formed by the light emitting semiconductor structure extending beyond the wavelength converting structure in the second dimension.