Color-Matched LED Package Covering for Uniform Off-State 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 color of the light emitting and non-light emitting regions, which affects the device's aesthetic appeal.
Innovation Solution
A light emitting device design featuring a first and second light emitting element, wavelength conversion members, a reflecting member, and a covering member with a pigment or dye, where the covering member's color matches the wavelength conversion member, creating a large contrast between light emitting and non-light emitting regions and ensuring the entire top surface appears as the same color during non-emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phosphor plate and white member are used in conventional light emitting devices, then the light emitting function is achieved, but the external appearance deteriorates due to color mismatch between light emitting and non-light emitting regions during non-light emission
Solution Approach 1:
The patent applies color matching by selecting a covering member with a specific color (yellowish color) that matches the phosphor plate color. This allows the non-light emitting region to blend with the light emitting region during non-light emission, eliminating the color mismatch problem while maintaining the light emitting function.
Solution Approach 2:
The covering member acts as an intermediary element that covers the white member (reflecting member) and matches the color of the phosphor plate. This intermediary layer harmonizes the appearance between the light emitting and non-light emitting regions, resolving the visual discontinuity without affecting the underlying light emitting structure.
2Loss of information
If the top surface shows both phosphor color and white member color during non-light emission, then the internal structure is visible, but the aesthetic appeal deteriorates
Solution Approach 1:
The covering member is specifically designed with a yellowish color that matches the phosphor plate, causing the white member to become visually indistinguishable during non-light emission. This color matching technique hides the internal structure (white member) while maintaining aesthetic appeal by presenting a uniform color surface.
Solution Approach 2:
The patent extracts the visual impact of the white member from the overall appearance by covering it with a color-matched layer. This separates the functional role of the white member (light reflection) from its visual presence, allowing it to perform its function without deteriorating the aesthetic appeal.
3Shape
If a covering member with color matching is introduced, then the external appearance is improved, but the device complexity increases
Solution Approach 1:
The patent improves external appearance through a straightforward color matching approach - selecting a covering member with a yellowish color that matches the phosphor plate. This simple color selection strategy achieves aesthetic improvement without requiring complex multi-layer structures or sophisticated design, thus minimizing the increase in device complexity.
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 during emission and maintains a uniform color appearance of the top surface during non-emission, enhancing the external appearance of the device.
Implementation Method 1
The covering member contains 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 first light emitting element, the lateral surfaces of the second light emitting element, the lateral surfaces of the first wavelength conversion member, and the lateral surfaces of the second wavelength conversion member
Data Source
AI summary
A light emitting device includes first and second light emitting elements, first and second wavelength conversion members, a reflecting member surrounding lateral surfaces of the first and second light emitting elements, and the lateral surfaces of the first and second wavelength conversion members, and a covering member continuously covering at least a top surface of the first wavelength conversion member, a top surface of the reflecting member disposed between the first and second wavelength conversion members, and a top surface of the second wavelength conversion member. The covering member contains 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.