Light-Emitting Device With Insulating Blocking Layer
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Solution Overview
Problem
Conventional light-emitting diodes (LEDs) face challenges in light extraction efficiency and leakage due to the proximity of semiconductor stacks and electrode pads, leading to inefficient light distribution and potential crosstalk when independently controlling light emission from multiple stacks.
Innovation Solution
A light-emitting device design featuring a substrate with multiple semiconductor stacks separated by a blocking layer, where each stack has a distinct light extraction area and electrode pad configuration, with a distance between stacks not exceeding 20 μm, and a reflector structure to minimize light leakage and enhance current spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple semiconductor stacks are placed close together to increase device density, then productivity and area utilization are improved, but light leakage and crosstalk between stacks increase
Solution Approach 1:
An insulating layer is introduced as an intermediary substance between adjacent semiconductor stacks. This layer acts as a barrier that prevents light from leaking between stacks while maintaining the close spacing required for high device density. The insulating material fills the gap between stacks, eliminating the harmful optical coupling effect.
Solution Approach 2:
The device structure is segmented into independent units by introducing insulating layers that divide the continuous semiconductor structure into discrete, isolated stacks. This segmentation prevents light crosstalk by creating optical barriers between adjacent light-emitting units, allowing each stack to be independently controlled.
2Adaptability or versatility
If semiconductor stacks are independently controlled for separate light emission, then adaptability and light distribution control are improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independently controllable semiconductor stacks, each with its own control terminals. This segmentation allows different regions to emit light independently with adjustable intensity, providing high adaptability for various lighting patterns and display configurations.
Solution Approach 2:
Different regions of the device can be controlled to emit light with different intensities, wavelengths, or timing characteristics. The insulating layers enable localized control by preventing optical interference between regions, allowing each area to be optimized for its specific function.
3Area of stationary object
If electrode pads are placed close to semiconductor stacks for compact design, then area utilization is improved, but light extraction efficiency decreases due to light absorption and interference
Solution Approach 1:
An insulating layer serves as an intermediary between the electrode pads and semiconductor stacks, reducing optical interference and light absorption. This layer allows the electrode pads to be positioned closer to the stacks for compact design while maintaining adequate light extraction efficiency by minimizing harmful optical interactions.
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 design improves light-emitting efficiency by reducing light leakage and crosstalk, allowing for independent control of light emission from each stack with even light distribution and reduced intensity ratios between stacks, thereby enhancing overall performance.
Implementation Method 1
a blocking layer between one of the semiconductor stacks and the substrate... reducing light leakage and crosstalk
Implementation Method 2
each of the multiple semiconductor stacks comprises a light extraction area... enhances overall performance
Data Source
AI summary
A light-emitting device includes: a substrate comprising a first side; multiple semiconductor stacks on the first side and separated from each other, wherein each of the multiple semiconductor stacks comprises a light extraction area; multiple electrode pads on the multiple semiconductor stacks; and a blocking layer between one of the semiconductor stacks and the substrate. The multiple semiconductor stacks comprises a first semiconductor stack and a second semiconductor stack, and the first semiconductor stack and the second semiconductor stack are independently controlled to emit light.