Light-Emitting Device Array Segmentation for Optical Output
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Solution Overview
Problem
Increasing the size of light-emitting points in light-emitting devices to enhance optical output often results in impaired uniformity and deterioration of light emission characteristics, such as distorted profiles and increased divergence angles, due to the generation of higher-order modes.
Innovation Solution
A light-emitting device with an array of light-emitting element groups, where each group consists of multiple light-emitting elements that are sequentially driven to either emit or not emit light concurrently, utilizing a configuration of laser diodes and thyristors to maintain low-order single transverse mode operation and prevent area expansion, thereby controlling light emission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the sizes of light-emitting points of light-emitting elements are increased to enhance optical output, then the optical output is improved, but the uniformity of light emission is impaired and light emission characteristics deteriorate due to higher-order mode generation
Solution Approach 1:
The light-emitting device is divided into multiple light-emitting elements arranged in an array, where each element operates independently at a small size to maintain low-order single transverse mode, while the collective array provides the required optical output. This segmentation allows each element to avoid higher-order mode generation while achieving high total output through coordinated operation of multiple elements.
2Power
If the sizes of light-emitting points of light-emitting elements are increased to enhance optical output, then the optical output is improved, but light emission characteristics such as light-emission profiles and divergence angles deteriorate
Solution Approach 1:
The device uses multiple small light-emitting elements instead of a single large element. Each small element maintains a clean Gaussian light-emission profile characteristic of low-order single transverse mode operation, while the array configuration achieves high total optical output without profile distortion.
Solution Approach 2:
Multiple light-emitting elements with identical small emission profiles are combined in an array configuration. The individual profiles are merged to create a composite beam with high total power while maintaining the desirable characteristics of low divergence and uniform intensity distribution.
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 approach allows for increased optical output without compromising light emission characteristics, ensuring uniformity and reduced divergence angles by maintaining low-order single transverse mode operation and minimizing area expansion.
Implementation Method 1
when the light-emitting elements perform laser oscillation
Implementation Method 2
a thyristor serving as a switching element arranged on the substrate and configured to selectively turn on and off light emission
Data Source
AI summary
A light-emitting device includes a light-emitting unit. The light-emitting unit includes an array of multiple light-emitting element groups, each including multiple light-emitting elements. In the light-emitting unit, the multiple light-emitting element groups are sequentially driven along the array such that, for each of the multiple light-emitting element groups, the multiple light-emitting elements included in the light-emitting element group are concurrently set to a state of emitting light or a state of not emitting light.