White Light Emitter With Phosphor Compensation for Color Uniformity
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Solution Overview
Problem
Existing white light emitting devices face challenges in ensuring color uniformity due to differences in electrical characteristics and usage-induced changes of light emitting devices, leading to complex driving circuits and inconsistent color reproduction when using multiple light sources or phosphors.
Innovation Solution
A white light emitting device is designed with a circuit board, multiple light sources emitting monochromatic light, a light converter, and a compensator with phosphor members that convert monochromatic light to white light, where the phosphor members are strategically arranged to address color mura and ensure uniformity, including arrangements on the circuit board and within light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting devices are used to synthesize white light, then color reproduction range is widened, but driving circuits become complex and color uniformity cannot be ensured
Solution Approach 1:
The patent combines multiple light emitting devices with different electrical characteristics into a single module, merging their functions to produce white light while simplifying the driving circuit structure. This approach maintains wide color reproduction range while reducing overall system complexity.
Solution Approach 2:
The light emitting device module is designed to perform multiple functions: it can accommodate devices with different electrical characteristics, convert monochromatic light to white light through phosphor, and maintain color uniformity. This multi-functionality resolves the contradiction by making a single module adaptable to various conditions.
2Adaptability or versatility
If multiple light emitting devices are used to synthesize white light, then color reproduction range is widened, but color uniformity cannot be ensured due to different characteristic changes
Solution Approach 1:
The patent applies different phosphor materials with specific characteristics to different regions or aspects of the light emitting device. By selecting phosphors with appropriate color temperatures and emission characteristics, it compensates for variations in electrical characteristics of individual light emitting devices, thereby ensuring color uniformity while maintaining wide color reproduction.
Solution Approach 2:
The patent adjusts parameters such as phosphor composition, particle size, and distribution to compensate for changes in light emitting device characteristics over time. By changing these parameters, the system maintains color uniformity even as individual devices undergo characteristic changes during operation.
3Device complexity
If one light emitting device and phosphor are used to synthesize white light, then driving circuits are simplified, but color uniformity cannot be ensured due to reflection and refraction
Solution Approach 1:
The patent introduces phosphor as an intermediary substance that converts monochromatic light from the light emitting device into white light. This intermediary approach simplifies the driving circuit while addressing color uniformity issues by using phosphor's optical properties to compensate for reflection and refraction effects.
Solution Approach 2:
The patent utilizes phosphor's ability to change color temperature and emission characteristics to compensate for optical effects such as reflection and refraction. By carefully selecting phosphor materials and their properties, the system maintains color uniformity while using a simplified single light emitting device configuration.
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 effectively improves color uniformity by converting scattered and reflected monochromatic light to white light, reducing color mura and enhancing brightness uniformity, thereby simplifying driving circuits and maintaining consistent color reproduction.
Implementation Method 1
a light converter spaced apart from the circuit board, the light converter configured to convert the monochromatic light emitted from the light sources to white light
Implementation Method 2
a compensator provided between the circuit board and the light converter, the compensator configured to convert the emitted monochromatic light to white light
Data Source
AI summary
A white light emitting device, including a circuit board; a plurality of light sources mounted on the circuit board, each light source of the plurality of light sources configured to emit monochromatic light; a light converter spaced apart from the circuit board, the light converter configured to convert the monochromatic light emitted from the light sources to white light; and a compensator provided between the circuit board and the light converter, the compensator configured to convert the emitted monochromatic light to white light.