Monolithic LED Micro-Display Common Anode Topology

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Solution Overview

Problem

Monolithic LED micro-displays face challenges in achieving uniform color purity, durability, and high power efficiency due to variations in turn-on voltages and emitting wavelengths of LEDs on active matrix panels.

Innovation Solution

The use of quantum dot LEDs or organic LEDs with a direct current driver architecture and modular design, featuring a common anode or cathode topology with NMOS driver circuits, ensures consistent supply voltage and high video brightness dynamics, allowing for manufacturing of different size displays using the same module.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If active matrix panel with varied LED distances to n-electrode is used, then micro-display can be manufactured, but turn-on voltage variations occur leading to non-uniform color purity and reduced durability

Engineering Contradiction:

Improvemicro-display manufacturing capabilityVSAvoidcolor uniformity and LED durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements a common anode configuration where all LEDs in a row share a common anode connection, ensuring equal electrical potential and uniform current distribution across all LEDs regardless of their position. This eliminates the voltage variations caused by different distances to individual n-electrodes in active matrix configurations, thereby achieving uniform color purity and extended LED durability throughout the micro-display.

Inventive Principle:

Principle #12Equipotentiality

2Ease of operation

If conventional active matrix driver architecture is used, then micro-display can be driven, but power efficiency is reduced due to voltage variations

Engineering Contradiction:

Improvemicro-display driving capabilityVSAvoidpower efficiency

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

By adopting a common anode architecture where all LEDs share the same reference potential, the system eliminates voltage drops associated with varied electrode distances. This results in more efficient power utilization as each LED receives consistent voltage, reducing energy waste and improving overall power efficiency while maintaining full driving capability.

Inventive Principle:

Principle #12Equipotentiality

3Reliability

If modular design with direct current driver architecture is used, then power efficiency and color uniformity improve, but device complexity increases

Engineering Contradiction:

Improvecolor uniformity and power efficiencyVSAvoiddriver circuit architecture

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the micro-display into modular segments where each row operates as an independent unit with its own common anode connection and controllable cathode lines. This segmentation allows for simplified driver circuits that can be replicated across multiple rows, achieving color uniformity and power efficiency through modular architecture rather than complex integrated control, thereby managing device complexity through standardization.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10700121B2Integrated multilayer monolithic assembly LED displays and method of making thereof

Publication Date: 2020.06.30 SCT

AI summary

A monolithic Light Emitting Diode (LED) micro-display contains one or more modular LED arrays. The LED array uses quantum dot light conversion technology or Organic Light Emitting Diode (OLED). The micro-display has a spacing-saving topology and a direct current driver architecture. Its modular design is scalable, which allows manufacturing micro-displays of various sizes using the same module.