Wavelength Conversion Structure for Cleaner Lateral LED Emission
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Solution Overview
Problem
Existing light-emitting devices do not effectively inhibit the portion of light not used as emitting light from affecting the desired emitting light, leading to inefficiencies and potential interference.
Innovation Solution
A light-emitting device design featuring a wavelength conversion member with a protrusion and a surrounding portion that includes a light-shielding film, along with a frame member and cover, to control the path of light emitted from the light-emitting element, ensuring only desired light is utilized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional light-emitting device structure is used without additional light-shielding components, then the device complexity is low, but unwanted light affects the desired emitting light leading to reduced efficiency
Solution Approach 1:
The wavelength conversion member is segmented into a wavelength conversion portion and a surrounding portion with a protrusion. This segmentation allows the surrounding portion to selectively block unwanted light while the wavelength conversion portion processes the desired light, thereby improving light emission efficiency without requiring a completely separate light-shielding component.
Solution Approach 2:
The light-shielding function is merged into the wavelength conversion member by adding the surrounding portion with the protrusion. This integration combines the wavelength conversion function and the light-shielding function into a single component, improving efficiency while minimizing the increase in device complexity.
2Productivity
If light-shielding structures are added to block unwanted light, then light emission efficiency improves, but the device complexity increases
Solution Approach 1:
The light-shielding function is merged into the wavelength conversion member by adding the surrounding portion with the protrusion. This integration combines the wavelength conversion function and the light-shielding function into a single component, improving efficiency while minimizing the increase in device complexity.
Solution Approach 2:
The wavelength conversion member is designed to perform multiple functions: wavelength conversion of the desired light and light-shielding of unwanted light. This multi-functionality allows a single component to address both needs, reducing the total number of components required in the device.
3Productivity
If the wavelength conversion member is designed with a protrusion and surrounding portion, then unwanted light is effectively blocked, but manufacturing complexity increases
Solution Approach 1:
The wavelength conversion member is segmented into a wavelength conversion portion and a surrounding portion with a protrusion. This segmentation allows the surrounding portion to selectively block unwanted light while the wavelength conversion portion processes the desired light, thereby improving light emission efficiency without requiring a completely separate light-shielding component.
Solution Approach 2:
The light-shielding function is merged into the wavelength conversion member by adding the surrounding portion with the protrusion. This integration combines the wavelength conversion function and the light-shielding function into a single component, improving efficiency while 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 design effectively inhibits unwanted light from interfering with the desired emitting light, enhancing the efficiency and performance of the light-emitting device.
Implementation Method 1
light emitted from an emission end surface of the light-emitting element and traveling in the lateral direction is incident on the incident lateral surface, undergoes wavelength conversion in the wavelength conversion portion
Data Source
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AI summary
A light-emitting device (200) includes a base member (211), light-emitting element (220), and a wavelength conversion member (240). Light-emitting element (220) is configured to emit light traveling in a lateral direction. The wavelength conversion member (240) is disposed at a lateral side of the light-emitting element (220). The wavelength conversion member (240) includes a wavelength conversion portion (241) and a surrounding portion (242). The wavelength conversion portion (241) having an incident lateral surface (241i) and an exit surface (241a) so that light is incident on the incident lateral surface (241i), undergoes wavelength conversion in the wavelength conversion portion (241), and exits through the exit surface (241a). The surrounding portion (242) includes a protrusion (242t) located above the light-emitting element (220), and protruding outwardly toward a light-emitting element side with respect to the incident lateral surface (241i) with the protrusion (242t) overlapping with the emission end surface (220a) of the light-emitting element (220) in a top view.