Compound-Eye Lens Layout for Uniform Multi-Color LED Emission
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Solution Overview
Problem
Increasing the number of light-emitting elements in a light-emitting device to enhance output power results in increased device size and uneven illuminance distribution, particularly when emitting different colors simultaneously.
Innovation Solution
A light-emitting device with a compound eye lens and alternating arrangement of light-emitting elements, where each element's center is offset from the lens center towards the lens' center, reducing the distance between elements and minimizing unevenness in emission color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of light-emitting elements is increased to enhance output power, then the output power is improved, but the device size increases
Solution Approach 1:
The light source is divided into multiple independent light-emitting elements arranged in an array, allowing each element to contribute to the total output power while maintaining a compact overall structure. The compound eye lens is segmented into multiple lens parts corresponding to each light-emitting element.
Solution Approach 2:
Multiple light-emitting elements and lens parts are integrated within a compact base member structure, with the compound eye lens positioned above the array of light-emitting elements, creating a nested arrangement that maximizes space utilization.
2Area of stationary object
If the distance between light-emitting elements is reduced to miniaturize the device, then the device size is reduced, but unevenness in illuminance distribution occurs
Solution Approach 1:
The light-emitting elements are intentionally offset from the centers of their corresponding lens parts in a specific asymmetric pattern. This asymmetric arrangement compensates for the reduced distance between elements, ensuring that the illuminance distribution remains uniform across the entire field of view.
Solution Approach 2:
Each light-emitting element is positioned with its center offset toward the center of the compound eye lens in a plan view, creating localized adjustments in the illuminance distribution pattern. This local quality adjustment ensures uniform overall distribution despite reduced spacing between elements.
3Area of stationary object
If the distance between light-emitting elements of different colors is reduced to miniaturize the device, then the device size is reduced, but unevenness in emission color occurs
Solution Approach 1:
Light-emitting elements of different colors are alternately arranged with specific offset positions relative to their corresponding lens parts. This asymmetric positioning ensures that when elements of different colors emit simultaneously, the resulting emission color remains uniform across the entire field of view, preventing color unevenness while maintaining compact device size.
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 device achieves a smaller size with uniform illuminance distribution and reduced emission color unevenness, allowing for adjustable light emission colors.
Implementation Method 1
a compound eye lens that has a plurality of lens parts disposed above the base member and facing the plurality of light-emitting elements
Data Source
AI summary
A light-emitting device includes: a plurality of light-emitting elements arranged in an array on a base member; and a lens that includes at least one lens part disposed above the base member and including a first surface that faces the plurality of light-emitting elements, the first surface including a plurality of protrusions. The plurality of light-emitting elements include: a first light-emitting element having a center that faces a lens center of the lens in a top view, and a second light-emitting element having a center offset from the lens center of the lens in the top view.