Polychromatic microLED Mesa Structure for Simpler Display Integration
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Solution Overview
Problem
Existing polychromatic LED devices require complex circuitry designs due to their four electrical contact terminals, making them challenging to integrate into direct-view displays effectively.
Innovation Solution
The development of LED devices with a single mesa structure featuring three p-n junctions and four electrical contact terminals, allowing for integration onto a backplane with independent contacts, enabling transfer and assembly as individual or mass arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polychromatic LED device uses four electrical contact terminals to enable full-color emission, then the device achieves polychromatic light output capability, but the circuitry design becomes complex and integration into direct-view displays becomes challenging
Solution Approach 1:
The patent segments the four electrical contact terminals into distinct functional groups: three terminals for driving the three p-n junctions (red, green, blue emitters) and one terminal for common electrical connection. This segmentation allows independent control of each color component while simplifying the overall circuitry design by providing a standardized interface for integration into direct-view displays.
2Adaptability or versatility
If a polychromatic LED chip requires a distinguished circuitry design for four contact terminals, then full-color emission is achieved, but the ease of manufacture and integration deteriorates
Solution Approach 1:
The patent creates a universal interface design where the four-contact terminal structure can serve multiple functions: driving three different color emitters, providing common electrical connection, and enabling straightforward integration into various direct-view display configurations. This multi-functional design simplifies manufacturing by standardizing the chip interface while maintaining full-color emission capability.
3Adaptability or versatility
If three p-n junctions are integrated in a single mesa structure, then polychromatic emission is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent merges three separate p-n junctions (red, green, blue emitters) into a single integrated mesa structure with four electrical contact terminals. This consolidation achieves polychromatic emission from one unified device while the standardized four-terminal interface simplifies the manufacturing process by providing clear electrical connection points, thereby reducing the overall precision requirements compared to integrating three separate LED devices.
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
Facilitates the integration of polychromatic LEDs into direct-view displays by simplifying the assembly process and ensuring electrical functionality, enhancing display performance.
Implementation Method 1
A light emitting diode (LED) is a semiconductor light source that emits visible light when current flows through it
Data Source
AI summary
Provided is an LED comprised of a single mesa epitaxial stack structure with a set of three p-n junctions and having four electrical contact terminals. A polychromatic, multi/full-color emitting, LED chip is assembled with a backplane and has four electrical contact terminals. The polychromatic LED is transferrable and able to be integrated each individually or as a mass array.