Stacked Bar-Type LED Light Emitting Device
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Solution Overview
Problem
Existing light emitting diode (LED) technologies face challenges in fabricating micro-bar-type LEDs with efficient light emission and color diversity on a micro or nano scale, particularly in achieving stable alignment and connection of LEDs between electrodes for enhanced light emission efficiency.
Innovation Solution
A light emitting device comprising multiple bar-type LEDs in different layers on a substrate, with insulating layers and contact electrodes for alignment and electrical connection, allowing for independent voltage application to each LED layer for selective light emission, improving light emission efficiency and color diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple bar-type LEDs are stacked in different layers to achieve color diversity, then color diversity is improved, but device complexity increases
Solution Approach 1:
The patent transitions from planar arrangement of LEDs to a three-dimensional stacked configuration across multiple layers. This vertical stacking enables multiple colors to be integrated within a compact footprint by utilizing the z-dimension, thereby achieving color diversity without proportionally increasing device area complexity
Solution Approach 2:
The patent implements a nested structure where multiple bar-type LEDs are positioned within different layers, with each layer containing LEDs that emit different colors. The layers are arranged such that LEDs in upper layers are positioned above and partially nested within the horizontal footprint of LEDs in lower layers, creating a compact multi-color configuration
2Manufacturing precision
If insulating layers and contact electrodes are added for alignment and electrical connection, then alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates insulating layers and contact electrodes as pre-integrated components during the fabrication process. The insulating layers are formed beforehand to define alignment references, and contact electrodes are positioned in advance to establish electrical connections, thereby enabling precise alignment without requiring complex post-assembly adjustments
Solution Approach 2:
The insulating layers serve as intermediary elements between adjacent bar-type LEDs, providing both electrical isolation and mechanical alignment references. The contact electrodes act as intermediaries for electrical connection, facilitating current flow to multiple LED layers through shared contact structures
3Productivity
If independent voltage application to each LED layer is implemented, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides the multi-layer LED structure into electrically independent segments, where each layer or group of layers can receive independent voltage control through separate contact electrodes. This segmentation enables selective activation of specific LED layers, allowing efficient light emission control for different colors without requiring complex circuitry for each individual LED
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 enables efficient light emission with improved alignment and connection of LEDs, enhancing the light emission efficiency and color diversity, making it suitable for various display applications.
Implementation Method 1
The first bar-type LED and the second bar-type LED may emit light of different colors
Implementation Method 2
at least one of the first bar-type LED or the second bar-type LED is electrically connected between the first electrode and the second electrode
Data Source
AI summary
A light emitting device includes a plurality of unit light emitting regions on a substrate. At least one of the unit light emitting regions includes at least one pair of first and second electrodes that are spaced apart, at least one first bar-type LED in a first layer on the substrate, and at least one second bar-type LED in a second layer on the substrate. At least one of the first bar-type LED or the second bar-type LED is electrically connected between the first electrode and the second electrode.