Angled Semiconductor Sidewalls for Stray Light Reduction
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Solution Overview
Problem
Conventional light-emitting devices suffer from significant stray light issues due to perpendicular light incidence and reflection at sidewalls, leading to reduced light propagation and increased stray light emission.
Innovation Solution
The design incorporates a light-emitting device with non-parallel sidewalls between semiconductor layers, where the first sidewall is adjacent to the second sidewall over a gap, and a normal to the first sidewall is not parallel to a normal to the second sidewall, enhancing light reflection and refraction to reduce stray light. This configuration includes a first semiconductor layer with a first light-emitting layer and a second semiconductor layer with a second light-emitting layer, where the sidewalls are angled to minimize perpendicular light incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional parallel sidewalls are used in light-emitting devices, then manufacturing is simpler, but stray light increases significantly
Solution Approach 1:
The patent applies asymmetry by configuring the sidewalls of adjacent semiconductor layers to be non-parallel, creating an asymmetric geometric relationship between layers. This asymmetric configuration prevents perpendicular light incidence and reflection that occurs with parallel sidewalls, thereby reducing stray light emission while maintaining manufacturing feasibility through standard patterning processes.
2Object-generated harmful factors
If non-parallel sidewalls are used in light-emitting devices, then stray light is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making the sidewall configuration specific to adjacent semiconductor layers only, rather than changing the entire device structure. The non-parallel sidewall arrangement is implemented locally at the interface between layers, allowing the rest of the device to maintain conventional simple structures, thus balancing stray light reduction with manufacturing complexity.
3Use of energy by moving object
If perpendicular light incidence occurs at sidewalls, then light propagation is reduced, but stray light emission increases
Solution Approach 1:
The patent converts the harmful perpendicular light incidence and reflection into a beneficial configuration. By designing non-parallel sidewalls, the structure naturally prevents light from incident perpendicularly and reflecting back as stray light. The geometric arrangement transforms what would be a harmful optical path into a controlled light propagation path that reduces stray light while maintaining efficiency.
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 solution effectively reduces stray light by promoting light reflection and refraction within the device, improving light propagation and reducing unwanted stray light emission, thereby enhancing the overall efficiency of the light-emitting device.
Implementation Method 1
enhancing light reflection and refraction to reduce stray light
Implementation Method 2
enhancing light reflection and refraction to reduce stray light
Data Source
AI summary
A light-emitting device in accordance with the present disclosure includes: a first semiconductor layer including a first light-emitting layer, and a second semiconductor layer including a second light-emitting layer, wherein the first semiconductor layer has a first sidewall adjacent to a second sidewall of the second semiconductor layer over a gap, and a normal to the first sidewall is not parallel to a normal to the second sidewall (α≠0°).