Display Electrode Circuit for Static Charge Alignment of LEDs

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Solution Overview

Problem

Display devices face issues with static electricity generation on electrodes, leading to potential damage and misalignment of light-emitting elements, which affects the stability and performance of the display.

Innovation Solution

Incorporation of a virtual circuit connected to electrodes to manage static electricity, utilizing electrostatic currents for preliminary alignment of light-emitting elements through electric fields, followed by secondary alignment with applied voltages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If ink is sprayed onto electrodes during manufacturing, then light-emitting elements can be deposited, but static electricity is generated due to surface friction between ink and electrodes

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidstatic electricity

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful static electricity into a useful tool by using it to generate an electric field that aligns light-emitting elements during the inkjet printing process. The static electricity that would normally damage components is instead harnessed to improve element alignment and device performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Ease of manufacture

If static electricity is generated on electrodes, then manufacturing process continues, but light-emitting elements may be damaged

Engineering Contradiction:

Improvemanufacturing process continuityVSAvoidlight-emitting element integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent transforms the potentially damaging static electricity into a beneficial force by using it to create an electric field that properly orients light-emitting elements. This approach maintains manufacturing continuity while protecting element integrity through controlled utilization of the static charge.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies a preliminary voltage to electrodes before inkjet printing to create an electric field that pre-aligns light-emitting elements as they are deposited. This preliminary action ensures proper orientation from the start, preventing misalignment issues that would require rework.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If no electric field is applied during element deposition, then manufacturing is simpler, but alignment of light-emitting elements is poor

Engineering Contradiction:

Improvemanufacturing process complexityVSAvoidelement alignment

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies a preliminary voltage to electrodes before and during inkjet printing to create an electric field that pre-aligns light-emitting elements as they are deposited. This preliminary action ensures proper orientation from the start, achieving high manufacturing precision with minimal additional complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the electrical parameter of the electrode (applying voltage to create electric field) to control the alignment of light-emitting elements during deposition. By adjusting the electric field strength and direction, precise element orientation is achieved without complex mechanical alignment systems.

Inventive Principle:

Principle #35Parameter changes

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 effectively prevents damage from static electricity and improves the alignment of light-emitting elements, enhancing the stability and performance of the display device.

Implementation Method 1

an electrostatic current may flow in the circuit (or the virtual circuit) due to the static electricity, light-emitting elements can be preliminarily aligned by an electric field generated by the electrostatic current

Methodology Applied

Scientific EffectElectrostatic field: Electric Field

Implementation Method 2

static electricity generated due to the surface friction between ink and the electrodes can be removed. Also, an electrostatic current may flow in the circuit (or the virtual circuit) due to the static electricity

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS20250316665A1Display device and method of fabricating the same

Publication Date: 2025.10.09 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a first substrate, a first electrode on the first substrate, a second electrode on the first substrate and spaced from the first electrode, a plurality of light-emitting elements each having respective end portions on the first and second electrodes, a first transistor having a first end connected to the first electrode and a second end grounded, and a second transistor having a first end connected to the second electrode and a second end grounded, wherein the first transistor is forward-biased to the first electrode, and the second transistor is reverse-biased to the second electrode.