Light-emitting device with varying aperture reflector
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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 non-uniform luminance across the device.
Innovation Solution
A light-emitting device design featuring a base member, conductor wiring, a reflective member with apertures, and a reflector with inclined lateral surfaces, where the area of apertures in the reflective member varies to enhance light density at the outer peripheral portions, matching the luminance at the central portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are arranged in a conventional manner, then the device structure is simple, but the luminance at the outer peripheral portion is lower than at the central portion
Solution Approach 1:
The reflector is divided into multiple surrounding portions, each with different aperture areas in the reflective member. The outer peripheral surrounding portions have larger aperture areas to increase light density, while inner portions have smaller aperture areas. This local differentiation of aperture sizes creates non-uniform light distribution that compensates for the natural light decay from center to periphery, achieving uniform luminance across the device.
Solution Approach 2:
The reflector structure is segmented into multiple surrounding portions (first, second, third surrounding portions) that respectively surround different groups of light sources. Each surrounding portion independently controls light distribution to its associated light sources through the aperture pattern in the reflective member, allowing localized optimization of luminance in different device regions.
2Illumination intensity
If light sources are arranged to increase outer peripheral luminance, then luminance uniformity improves, but the device structure becomes more complex
Solution Approach 1:
The aperture area parameter in the reflective member is varied across different surrounding portions. By changing this geometric parameter (aperture area) rather than modifying the fundamental structure, the patent achieves different light distribution characteristics in different regions. The aperture areas are specifically designed to be larger in outer peripheral portions to increase light density and luminance in those regions.
Solution Approach 2:
Different aperture areas are assigned to reflective member locations corresponding to different device regions. The local quality of light reflection is optimized by making outer peripheral apertures larger to direct more light to outer regions, while inner apertures remain smaller. This local optimization achieves uniform luminance without requiring complex additional components.
3Quantity of substance
If the reflective member has uniform aperture areas, then the structure is simple, but light density at the outer peripheral portion is insufficient
Solution Approach 1:
The aperture areas in the reflective member are made non-uniform, with larger areas in outer peripheral surrounding portions and smaller areas in inner surrounding portions. This local differentiation of aperture quality directly controls the quantity of light reflected to different regions, ensuring sufficient light density at the outer periphery while maintaining appropriate light levels at the center.
Solution Approach 2:
The aperture area parameter is systematically varied across the reflective member to match the light distribution requirements of different device regions. By changing this single parameter (aperture area) in a controlled manner across different surrounding portions, the patent achieves the desired light density distribution without adding structural 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 achieves uniform luminance across the device by increasing light density at the outer peripheral portions, ensuring similar luminance to the central portions, thereby improving overall luminance uniformity.
Implementation Method 1
a reflective member covering the upper surface of the base member and an upper surface of the conductor wiring and having a plurality of apertures
Implementation Method 2
each of the plurality of surrounding portions having inclined lateral surfaces that widen in an upward direction
Data Source
AI summary
A light-emitting device includes a base member, conductor wiring on an upper surface of the base member, a reflective member covering the upper surfaces of the base member and the conductor wiring and having apertures to expose part of the upper surface of the base member and part of the upper surface of the conductor wiring, a plurality of light sources bonded to the part of the upper surface of the conductor wiring located in the apertures with bonding members, and a reflector that is disposed on the reflective member and includes a plurality of first surrounding portions and a plurality of second surrounding portions surrounding the first surrounding portions, which respectively surround the light sources in a plan view. Each surrounding portion has inclined lateral surfaces that widen in an upward direction. An aperture in each second surrounding portion is smaller than an aperture in each first surrounding portion in the plan view.