Light-Emitting Device With Concave Reflective Curvature
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Solution Overview
Problem
There is a demand for enhancing optical coupling efficiency between a light-emitting device and a light-guiding plate in backlight systems, as existing solutions do not effectively utilize the light emitted by the light-emitting device.
Innovation Solution
A light-emitting device is designed with a first and second light-emitting element, a light-transmissive member, and a light-reflective member, where the light-transmissive member has exposed surfaces and the light-reflective member includes concave curved surfaces to optimize light coupling with the light-guiding plate, reducing light divergence and enhancing optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional LED package is used with a light-guiding plate, then the structure is simple, but the optical coupling efficiency is insufficient
Solution Approach 1:
The light-reflective member includes a first portion with a concave curved surface in a cross-section extending along the first direction. This curved surface configuration optimizes light reflection and directs light more effectively into the light-guiding plate, thereby improving optical coupling efficiency without significantly complicating the overall device structure.
Solution Approach 2:
The invention introduces a light-reflective member with three-dimensional curved surfaces that interact with light in multiple directions. The concave curved surface in the first direction and additional curved surfaces in other directions create a multi-dimensional light management system, enhancing optical coupling by controlling light propagation in various spatial dimensions.
2Loss of energy
If the light-emitting device is placed close to the light-guiding plate for better coupling, then optical efficiency improves, but the risk of breakage due to contact increases
Solution Approach 1:
The light-reflective member acts as an intermediary component between the light-emitting element and the light-guiding plate. It optimizes light reflection and direction while maintaining a physical buffer that prevents direct contact between the light-emitting device and the plate, thereby reducing breakage risk while preserving high optical coupling efficiency.
3Illumination intensity
If light is emitted directly without reflection optimization, then the device structure is simple, but light divergence is high and optical efficiency is low
Solution Approach 1:
The light-reflective member incorporates concave curved surfaces that are specifically designed to reflect and concentrate light in desired directions. The curved geometry naturally focuses divergent light rays, improving illumination intensity and directionality while maintaining a relatively simple single-component 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 significantly improves the optical coupling efficiency between the light-emitting device and the light-guiding plate, ensuring effective light utilization and reducing the risk of light-emitting device breakage due to contact with the plate, while maintaining reliability.
Implementation Method 1
a light-reflective member in contact with at least portions of the lateral surfaces of the first light-emitting element, at least portions of the lateral surfaces of the second light-emitting element, and the lateral surface of the light-transmissive member
Data Source
AI summary
A light-emitting device includes first and second light-emitting elements arranged along a first direction; at least one light-transmissive member having a lateral surface and covering the upper surfaces of the first and second light-emitting elements; and a light-reflective member in contact with at least portions of the lateral surfaces of the first and second light-emitting elements, and the lateral surface of the light-transmissive member. The light-transmissive member has first and second surfaces exposed from the light-reflective member and located above the upper surfaces of the first and second light-emitting elements, respectively. The light-reflective member includes a first portion located between the first surface and the second surface in the first direction above the first and second surfaces. The first portion includes at least one concave curved surface in a first cross-section extending along the first direction and perpendicular to the upper surface of the first light-emitting element.