Light Emitting Apparatus With Dome Window for Uniform Beam Control
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Solution Overview
Problem
Existing light emitting devices struggle with non-uniform light distribution and inefficiencies in light path control, leading to variations in illumination intensity and beam angles.
Innovation Solution
A light emitting apparatus featuring a substrate with a luminous region and non-luminous region, equipped with a dome-shaped window and reflector that controls light path and includes an adhesive layer, where the distance between adjacent light emitting structures is 500 micrometers or less, ensuring uniform light emission with a beam angle of 90 degrees or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting structures are placed close together (distance ≤ 500 micrometers), then light distribution uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs a dome-shaped window structure with curved surfaces to control light paths. The spherical/curved geometry of the dome window refracts and redirects light from multiple closely-spaced light emitting structures, creating uniform light distribution across the luminous region while accommodating the tight spacing requirement
Solution Approach 2:
The patent optimizes specific parameters including the dome window height (30-70% of diameter), light emitting structure spacing (≤500 micrometers), and refractive index differences between materials to achieve uniform light distribution while maintaining manufacturability at close spacing
2Shape
If a dome-shaped window is used to control light path, then beam angle control is improved, but device complexity increases
Solution Approach 1:
The dome-shaped window serves multiple functions simultaneously: it acts as a protective cover for light emitting structures, functions as an optical element to control light paths and beam angle, and works in conjunction with the reflector to achieve uniform light distribution. This multi-functionality reduces overall device complexity despite the sophisticated geometry
Solution Approach 2:
The curved dome geometry provides inherent optical focusing and beam angle control through refraction at the curved interfaces, eliminating the need for additional complex optical components while achieving precise beam angle control (≤90 degrees)
3Productivity
If light emitting structures are densely arranged, then productivity is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The patent introduces an adhesive layer as an intermediary thermal management component between the light emitting structures and the substrate/reflector assembly. This adhesive layer serves as a thermal interface to conduct heat away from the densely packed light emitting structures, enabling high productivity while managing heat dissipation challenges
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 apparatus achieves uniform light distribution with minimal intensity variations, enhancing the reliability and efficiency of light emission.
Implementation Method 1
A light emitting diode refers to a semiconductor device that emits light through recombination of electrons and holes
Implementation Method 2
The reflector is configured to support the window and reflect the light emitted from the plurality of light emitting structures
Implementation Method 3
The window is configured to control a traveling path of light emitted from the a plurality of light emitting structures
Data Source
AI summary
A light emitting apparatus includes a substrate, a plurality of light emitting structures, a window, and a reflector. The substrate has a luminous region and a non-luminous region. The plurality of light emitting structures is disposed on the luminous region of the substrate. The window has a dome shape and is disposed to cover the luminous region. The window is configured to control a traveling path of light emitted from the a plurality of light emitting structures. The reflector is configured to support the window and reflect the light emitted from the plurality of light emitting structures. The reflector has an opening that exposes the plurality of light emitting structures mounted on the substrate. A distance between two adjacent light emitting structures of the plurality of light emitting structures is 500 micrometers or less.