Semiconductor Light Source Resistance Layout for Uniform LiDAR Emission
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Solution Overview
Problem
Conventional light source devices for LiDAR systems using multiple semiconductor light emitting elements suffer from non-uniform light emission, leading to increased power consumption and reduced efficiency.
Innovation Solution
A light source device comprising a plurality of semiconductor light emitting elements, where the elements are grouped based on distance from the power supply pad, and the elements closer to the power supply pad have a higher resistance value between the electrodes, ensuring uniform current distribution and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of semiconductor light emitting elements is increased to increase output, then the ranging distance is extended, but the power consumption increases
Solution Approach 1:
The patent changes the electrical resistance parameter of semiconductor light emitting elements based on their position in the array. Elements closer to the power supply pad have lower resistance, while those farther away have higher resistance. This parameter adjustment compensates for voltage drops in the power supply network, enabling uniform current distribution across all elements and improving overall power efficiency
2Use of energy by moving object
If the element resistance is reduced to reduce power consumption, then the power consumption decreases, but the light emission uniformity deteriorates
Solution Approach 1:
The patent applies local quality by assigning different resistance values to different groups of semiconductor light emitting elements based on their spatial location. Elements in different regions of the array have locally optimized resistance values that compensate for position-dependent voltage drops, achieving both low power consumption and uniform light emission across the entire array
3Reliability
If the doping concentration of upper reflector is increased to reduce element resistance, then the element resistance decreases, but the light emission uniformity across the array deteriorates
Solution Approach 1:
The patent segments the semiconductor light emitting elements into multiple groups based on their distance from the power supply pad. Each group is assigned a specific resistance value optimized for its location. This segmentation allows the system to achieve low overall resistance while maintaining uniform light emission, as each segment's resistance is tailored to its electrical environment
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 achieves improved uniformity of light emission across the semiconductor light emitting elements, reducing power consumption and enhancing the efficiency of the LiDAR system.
Implementation Method 1
a first semiconductor resonator including a first active layer... configured to emit light
Implementation Method 2
a first reflector, a first semiconductor resonator including a first active layer, a second reflector... in order
Data Source
AI summary
Alight source device includes a plurality of semiconductor light emitting elements configured to stack, on a first surface side of a semiconductor substrate, a first reflector, a first semiconductor resonator including a first active layer, a second reflector, and a first electrode in order, and to stack a second electrode on a second surface of the semiconductor substrate opposite to the first surface. A power supply pad supplies power to the plurality of semiconductor light emitting elements. The plurality of semiconductor light emitting elements are divided into a plurality of groups according to a distance from the power supply pad. The semiconductor light emitting element in the group with a shorter distance to the power supply pad is configured to have a larger resistance value between the first electrode and the second electrode.