LED Grid Structure for Color Stability and Beam Uniformity
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Solution Overview
Problem
Current LED-based illumination devices face limitations in light output level, color quality stability, and expense due to color point instability, poor color rendering, spatial, and angular variations, as well as the need for costly color control electronics and sensors.
Innovation Solution
The implementation of a grid structure with color conversion pockets coated with different wavelength converting materials on a transmissive layer over LEDs, allowing for tuning of the color point and output beam uniformity by varying the composition and placement of wavelength converting materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional LED illumination devices are used, then the basic lighting function is provided, but the light output level is limited and color quality is poor
Solution Approach 1:
The output window is divided into multiple discrete pockets arranged in a grid pattern, with each pocket containing different wavelength converting materials. This segmentation allows independent optimization of color conversion in different regions while maintaining overall uniform illumination.
Solution Approach 2:
Different pockets are coated with different wavelength converting materials (e.g., some pockets with yellow phosphor, others with red phosphor) to create localized color conversion zones. This local differentiation enables precise control over the spectral composition and color temperature in specific areas of the output beam.
2Reliability
If multiple types of wavelength converting materials are used in different pockets, then color point stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The output window is divided into multiple discrete pockets arranged in a grid pattern, with each pocket containing different wavelength converting materials. This segmentation allows independent optimization of color conversion in different regions while maintaining overall uniform illumination.
Solution Approach 2:
Different pockets are coated with different wavelength converting materials (e.g., some pockets with yellow phosphor, others with red phosphor) to create localized color conversion zones. This local differentiation enables precise control over the spectral composition and color temperature in specific areas of the output beam.
3Reliability
If color control electronics and sensors are added to maintain color point, then color quality improves, but the device cost increases
Solution Approach 1:
The illumination device uses passive optical elements (wavelength converting materials in fixed pockets) to achieve color conversion and control, eliminating the need for active electronic control systems. The color point is stabilized through the inherent properties of the phosphor materials and their spatial arrangement, not through feedback control electronics.
Solution Approach 2:
The patent replaces electronic control mechanisms (feedback sensors, dimmers, controllers) with an optical solution using wavelength converting materials. The color conversion is achieved through passive optical transformation rather than active electronic adjustment, significantly reducing device complexity and cost.
4Stability of the object's composition
If a grid structure with multiple wavelength converting materials is implemented, then beam uniformity is improved, but the structural complexity increases
Solution Approach 1:
The output window is divided into multiple discrete pockets arranged in a grid pattern, with each pocket containing different wavelength converting materials. This segmentation allows independent optimization of color conversion in different regions while maintaining overall uniform illumination.
Solution Approach 2:
The grid structure serves multiple functions simultaneously: it provides mechanical support for the wavelength converting materials, creates uniform beam distribution through its periodic pattern, and enables color conversion across the entire output window. This multi-functionality reduces the need for additional separate components.
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 approach enhances light output, stabilizes color quality, and reduces costs by improving color consistency and beam uniformity while minimizing the need for expensive color control electronics.
Implementation Method 1
A portion of the pockets are coated with a first type of wavelength converting material while other portions of the pockets are coated with a different type of wavelength converting material
Data Source
AI summary
An illumination module includes a plurality of Light Emitting Diodes (LEDs). A grid structure is present on a transmissive layer over the LEDs, such as an output window, to form a plurality of color conversion pockets. A portion of the pockets are coated with a first type of wavelength converting material while other portions of the pockets are coated with a different type of wavelength converting material.