Reflector Opening Layout for Uniform LED Edge Luminance
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Solution Overview
Problem
Conventional light-emitting devices exhibit lower luminance at the outer peripheral portions compared to the central portions due to inefficient light distribution, resulting in uneven luminance across the device.
Innovation Solution
The design includes a base member with light sources and a reflector featuring surrounding portions with inclined lateral surfaces, where the second surrounding portions have smaller opening areas than the first, enhancing light density at the outer peripheral regions to match central luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional light sources are arranged on a base member, then the light-emitting device can be constructed simply, but the luminance at outer peripheral portions becomes lower than at the central portion
Solution Approach 1:
The reflector is divided into multiple surrounding portions (first surrounding portions and second surrounding portions) that are arranged in different regions. Each surrounding portion independently reflects light from nearby light sources, allowing localized control of light distribution to achieve uniform luminance across the device surface.
Solution Approach 2:
Different regions of the device are provided with different types of surrounding portions tailored to their specific needs. The first surrounding portions are placed in central regions while second surrounding portions are placed in outer peripheral regions, with each type having optimized opening areas to address the specific luminance requirements of its region.
2Ease of manufacture
If light sources are arranged with constant intervals, then the arrangement is simple and regular, but light density becomes insufficient at outer peripheral portions
Solution Approach 1:
The surrounding portions act as intermediary elements between the light sources and the device surface. These reflectors redirect and concentrate light from the constantly-spaced light sources toward outer peripheral regions, effectively mediating the light distribution to compensate for the regular spacing of light sources.
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
This configuration achieves uniform luminance throughout the light-emitting device by increasing light density at the outer peripheral portions, ensuring similar luminance to the central portion without altering the light source arrangement.
Implementation Method 1
a reflector that comprises a plurality of surrounding portions. Each of the plurality of surrounding portions surrounds a respective one of the plurality of light sources
Data Source
AI summary
A light-emitting device includes a base member, a plurality of light sources on or above an upper surface of the base member, and a reflector that comprises a plurality of surrounding portions. Each of the plurality of surrounding portions surrounds a respective one of the plurality of light sources in a plan view. Each of the plurality of surrounding portions has inclined lateral surfaces widened upward. Intervals between adjacent ones of the plurality of light sources are constant in the plan view. Upper peripheries of the inclined lateral surfaces of each of the plurality of surrounding portions define an opening having a substantially rectangular shape. The plurality of surrounding portions include a plurality of first surrounding portions and a plurality of second surrounding portions surrounding the plurality of first surrounding portions. An area of the opening of each of the plurality of second surrounding portions is smaller than an area of the opening of each of the plurality of first surrounding portions.