Light-Emitting Element Array Wiring for Faster Response Speed
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Solution Overview
Problem
The existing light-emitting element arrays, such as those using VCSEL elements, face a decrease in response speed, which is a critical issue in sensing applications where faster response times are desired.
Innovation Solution
A light-emitting element array with a specific wiring structure where first and second wires are electrically connected to the light-emitting elements in orthogonal directions, with currents flowing in opposite orientations, and additional wires connected to second light-emitting elements, allowing for improved current distribution and reduced inductance, enhancing response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a row wire and column wire are connected to each of a large number of light-emitting elements arranged in a matrix, then the wiring structure can support high density and large number of elements, but the response speed of the light-emitting element decreases
Solution Approach 1:
The patent segments the single wire connection into multiple parallel wires (first wire and second wire) that connect to the same light-emitting element. This segmentation allows current to be distributed through multiple paths, reducing the inductance of each individual wire and improving the response speed while maintaining support for a large number of elements.
Solution Approach 2:
The patent introduces a new dimension to the wiring structure by adding parallel wires in the same plane rather than just orthogonal row and column wires. This dimensional addition allows for reduced inductance through parallel current paths without increasing the vertical complexity of the structure.
2Quantity of substance
If wiring is provided for each light-emitting element in a dense array, then the array density can be increased, but the inductance increases and response speed decreases
Solution Approach 1:
The patent merges the function of multiple wires into a coordinated system where the first wire and second wire work together to supply current to the same light-emitting element. This merging of functions reduces the effective inductance while maintaining a manageable wiring structure that supports high element density.
Solution Approach 2:
The first wire and second wire serve multiple functions: they individually provide current paths to light-emitting elements and collectively reduce inductance through their parallel arrangement. This multi-functionality allows the wiring structure to support both high density and fast response without proportionally increasing complexity.
Data Source
AI summary
[Object] To provide a light-emitting element array having a wiring structure that enables an increase in response speed of a light-emitting element.[Solving Means] A light-emitting element array according to the present technology includes: a light-emitting element group; a first wire; and a second wire. The light-emitting element group forms a light-emitting element surface on which a plurality of light-emitting elements is arranged in a planar shape and includes first light-emitting element columns, first light-emitting elements included in the plurality of light-emitting elements being arranged along a first direction parallel to the light-emitting element surface in each of the first light-emitting element columns. The first wire extends along the first direction and is electrically connected to each of the first light-emitting elements in each of the first light-emitting element columns, a current flowing through the first wire in a first orientation parallel to the first direction. The second wire extends along the first direction and is electrically connected to each of the first light-emitting elements in each of the first light-emitting element columns, a current flowing through the second wire in a second orientation parallel to the first direction and opposite to the first orientation.