Rectangular Light-Emitting Device With Short-Side Electrodes
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Solution Overview
Problem
Existing light-emitting devices have a large size due to the longitudinal arrangement of electrode units, which hinders miniaturization and efficient light emission.
Innovation Solution
A light-emitting device with a rectangular substrate where the electrode unit is disposed along the short side, incorporating a transfer unit between parts of the electrode unit, and a light-emitting unit comprising VCSELs connected in series with drive and transfer thyristors, allowing for compact design and increased light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electrode unit is disposed in the longitudinal direction of the light-emitting device, then the device structure is simple, but the device size becomes large
Solution Approach 1:
The patent applies dimensionality change by repositioning the electrode unit from a longitudinal arrangement to a lateral arrangement along the short side of the substrate. This spatial reconfiguration reduces the device's length while maintaining functional integrity, effectively resolving the contradiction between structural simplicity and compact size through a change in dimensional layout.
Solution Approach 2:
The patent inverts the conventional longitudinal arrangement of the electrode unit by placing it along the short side of the substrate instead. This inversion of the traditional design approach allows the device to achieve a compact form factor while preserving the essential electrical connection functionality, thereby solving the size-complexity contradiction.
2Length of stationary object
If the electrode unit is disposed along the short side with transfer unit interposed, then the device size is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the electrode unit into multiple sections with the transfer unit interposed between them. This segmentation allows the electrode unit to be arranged along the short side of the substrate, achieving compact device size while the modular structure manages the complexity through functional division of the electrode connections.
Solution Approach 2:
The transfer unit serves as an intermediary element that connects different sections of the electrode unit. This intermediary component enables the electrode unit to be disposed along the short side in a compact manner while managing the structural complexity through the mediating function of the transfer unit, which handles the electrical connections between segmented electrode portions.
3Illumination intensity
If VCSELs are arranged in two-dimensional array, then light output is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from a one-dimensional linear arrangement of VCSELs to a two-dimensional array configuration. This two-dimensional arrangement increases the light output by incorporating more light-emitting elements within the compact substrate area, while the regular grid pattern of the array facilitates systematic manufacturing processes.
Solution Approach 2:
The patent merges multiple VCSELs into a two-dimensional array configuration, combining their light-emitting functions to achieve enhanced overall light output. This merging approach allows the device to deliver higher illumination intensity while the standardized array structure enables efficient batch manufacturing and assembly processes.
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 compact design reduces the device size while enhancing light output by integrating VCSELs in a two-dimensional array, facilitating efficient light emission and miniaturization.
Implementation Method 1
a light-emitting unit 120 including plural light-emitting elements; wherein the light-emitting elements include vertical cavity surface emitting lasers (VCSELs) connected in series
Data Source
AI summary
A light-emitting device includes: a substrate; a light-emitting unit including plural light-emitting elements; a transfer unit configured to output a signal that controls a light-emitting state of the light-emitting elements; and an electrode unit configured to input and output a signal that drives the transfer unit, the substrate has a rectangular shape having a long side and a short side, and the electrode unit is disposed along the short side of the substrate with the transfer unit interposed between a part of the electrode unit and other part of the electrode unit.