Light Emitting Device With Segmented Transmissive Protrusions
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Solution Overview
Problem
Existing semiconductor light emitting devices face reduced light extraction efficiency due to light absorption by adjacent elements when individual light emitting elements are lit.
Innovation Solution
A light emitting device configuration featuring multiple light emitting elements with different wavelengths, a light-transmissive member, and a covering member that surrounds the elements to reduce light absorption, with the light-transmissive member covering the emission surfaces and the covering member positioned to minimize light leakage and absorption between elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting elements are mounted in the recess of a package, then a single semiconductor light emitting device can emit various colors of light, but light extraction efficiency is reduced due to light absorption by adjacent elements
Solution Approach 1:
A light-transmissive member is introduced as an intermediary component between adjacent light emitting elements. This member includes light-transmissive protrusions that extend toward the light emitting elements, creating physical separation and preventing direct light absorption between adjacent elements while maintaining the multi-color emission capability of the device.
Solution Approach 2:
The light-transmissive member is segmented into multiple light-transmissive protrusions, each positioned to correspond with individual light emitting elements. This segmentation allows each protrusion to independently shield its associated light emitting element from adjacent elements, reducing cross-absorption while preserving the overall multi-color emission function.
2Loss of energy
If light-transmissive protrusions are extended from the light-transmissive member toward the light emitting elements, then light absorption between elements is reduced, but manufacturing complexity increases
Solution Approach 1:
The light-transmissive member serves multiple functions simultaneously: it provides structural support for mounting light emitting elements, acts as a light-transmissive cover, and creates separation through its protrusions to reduce light absorption. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in manufacturing complexity.
Solution Approach 2:
The light-transmissive member integrates multiple functions into a single component: it combines the functions of a protective cover, a mounting structure, and a light management element with protrusions. By merging these functions, the design avoids the need for separate components for each function, thus controlling manufacturing 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 configuration enhances light extraction efficiency by minimizing light absorption between elements, allowing for improved light output and better color reproduction in display devices.
Implementation Method 1
a light-transmissive member includes a plurality of light-transmissive protrusions extending from a lower surface toward the light emitting elements so as to reduce light absorption between the light emitting elements
Implementation Method 2
Existing semiconductor light emitting devices face reduced light extraction efficiency due to light absorption by adjacent elements when individual light emitting elements are lit
Data Source
AI summary
A light emitting device includes a plurality of light emitting elements, a light-transmissive member, and a covering member. The light emitting elements each has a pair of electrodes on a lower surface thereof. The light-transmissive member includes a plurality of recesses on a lower surface thereof with the light emitting elements being respectively accommodated in the recesses so that light from the light emitting elements transmits through the light-transmissive member. The covering member surrounds an outer periphery of each of the light emitting elements, and constitutes a part of a lower surface and a part of an outermost lateral surface of the light emitting device. The covering member is in contact with a part of each of the light emitting elements. Lower surfaces of the electrodes are exposed from the covering member at the lower surface of the light emitting device.