Polychromic MicroLED Arrays for Multi-Color Optical Data Links
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Solution Overview
Problem
Existing optical communication systems using LEDs are limited by decreased power and broad wavelength, restricting them to shorter distances compared to laser-based systems, and there is a need for improved methods to enhance data transmission bandwidth and efficiency in short-range communications.
Innovation Solution
Employing microLED arrays with individually addressable single color and polychromic microLEDs, utilizing correlated color temperature and color-rendering index to adjust color temperature and brightness, and employing drivers with PWM or analog approaches to control microLEDs, enabling high-speed data communications over short distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LEDs are used for optical communication, then the system is simpler and more efficient, but the transmission distance is limited due to decreased power and broad wavelength
Solution Approach 1:
The system segments the optical communication channel into multiple wavelength channels (e.g., red, green, blue channels). Each microLED emits at a specific wavelength, and photodetectors detect specific wavelength ranges. This segmentation allows parallel data transmission across multiple wavelength channels, increasing overall bandwidth while each individual LED operates at optimized power levels for its specific wavelength.
Solution Approach 2:
The patent transitions from single-wavelength communication to multi-wavelength communication by adding the wavelength dimension to the data transmission capability. By utilizing multiple wavelength channels simultaneously, the system increases the dimensionality of the communication space, allowing more data to be transmitted in parallel without requiring proportionally higher power from each individual LED.
2Productivity
If microLED arrays with multiple colors are used, then data transmission bandwidth increases, but device complexity increases
Solution Approach 1:
The microLED array is segmented into multiple subarrays, where each subarray contains microLEDs that emit at different wavelengths (colors). This segmentation allows independent control and optimization of each wavelength channel while maintaining overall system coordination through the controller, managing complexity through structured organization.
Solution Approach 2:
The system uses a universal controller that manages multiple wavelength channels through standardized protocols. The controller coordinates all microLEDs and photodetectors across different wavelengths using the same control architecture, allowing the system to handle multiple functions (different wavelength transmissions) through a single unified control mechanism, thereby managing complexity.
3Illumination intensity
If color temperature and brightness control is implemented, then color representation improves, but system complexity increases
Solution Approach 1:
The system controls color temperature and brightness by dynamically adjusting the intensity parameters of individual microLEDs emitting at different wavelengths. By changing the drive current or duty cycle of each wavelength channel, the system achieves precise control over the overall color temperature and brightness output, improving color representation through parameter optimization rather than additional hardware.
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 use of microLED arrays with controlled color temperature and brightness increases data transmission bandwidth and efficiency, allowing high-speed data communications over short distances with improved color representation and reduced power requirements.
Implementation Method 1
a first microLED array that contains multiple subarrays, each subarray including multiple independently-addressable single color microLEDs configured to emit light of different colors
Implementation Method 2
a photodetector array configured to receive multi-color light from another microLED array
Data Source
AI summary
A microlight emitting diode (LED) system and method of transmitting data are disclosed. The system includes either a first array that contains multiple subarrays or a second array. Each subarray includes multiple independently-addressable single color microLEDs that emit light of different colors and are independently modulated for data communication to another microLED array. The second array contains at least one independently-addressable polychromic microLED. Each polychromic microLED has multiple independently-addressable active regions that emit different colors and that are independently modulated for data transmission to the other microLED array. A photodetector array receives data as multi-color light from the other microLED array and has multiple photodetectors each tuned for a specific color.