LED Covering Layer Color Matching for Uniform Top-Surface Appearance
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Solution Overview
Problem
Conventional light emitting devices used in smartphone cameras have a poor external appearance due to the visibility of the phosphor and white member colors during non-light emission, leading to a mismatch in the top surface color, which affects the design and aesthetics.
Innovation Solution
A light emitting device design where a covering member with a pigment or dye is used to match the color of the wavelength conversion member, creating a large contrast between light emitting and non-light emitting regions during emission, and ensuring the entire top surface appears as the same or similar color to the wavelength conversion member during non-emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a phosphor plate is adhered on a light emitting element with a light reflective white member covering the periphery, then the light emitting device can emit light effectively, but the top surface appears with two different colors (phosphor color and white member color) during non-light emission, resulting in poor external appearance
Solution Approach 1:
The patent applies a covering member containing pigment or dye that changes or masks the color appearance. The covering member is designed to have a body color matching the wavelength conversion member, so during non-light emission the entire top surface appears uniform. During light emission, the covering member allows light to pass through while maintaining the contrast between light emitting and non-light emitting regions.
2Shape
If the top surface of the light emitting device has different colors from the wavelength conversion member during non-light emission, then the structural components can be clearly distinguished, but the external appearance and uniformity are compromised
Solution Approach 1:
The covering member contains pigment or dye that matches the color of the wavelength conversion member, creating a uniform appearance during non-light emission. This color matching principle ensures that the top surface appears homogeneous while still allowing the underlying structure to function properly.
3Shape
If a covering member with pigment or dye is applied to match the wavelength conversion member color, then the external appearance and color uniformity are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The covering member is designed to contain pigment or dye that provides color matching with the wavelength conversion member. This approach achieves uniform appearance while the patent describes practical manufacturing methods including applying the covering member over the assembled structure.
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 achieves a high contrast between light emitting and non-light emitting regions and maintains the top surface color consistency with the wavelength conversion member, enhancing the external appearance and functionality of the device.
Implementation Method 1
the covering member containing at least one of a pigment and a dye so that a body color of the covering member is the same or a similar color as a body color of the wavelength conversion member
Implementation Method 2
a reflecting member surrounding the lateral surfaces of the light emitting element and the lateral surfaces of the wavelength conversion member
Data Source
AI summary
A method of manufacturing a light emitting device includes: providing a light emitting structure including a light emitting element having a top surface and lateral surfaces, a wavelength conversion member having a top surface, a bottom surface, and lateral surfaces, with the bottom surface of the wavelength conversion member facing the top surface of the light emitting element, and a reflecting member surrounding the lateral surfaces of the light emitting element and the lateral surfaces of the wavelength conversion member, the reflecting member having a top surface; and supplying a covering member to cover the top surface of the wavelength conversion member and the top surface of the reflecting member, the covering member containing at least one of a pigment and a dye so that a body color of the covering member is the same or a similar color as a body color of the wavelength conversion member.