OLED Anode Ion Bombardment Aperture Ratio

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Solution Overview

Problem

The fabrication of high-resolution OLED displays faces challenges due to the limitation of the aperture ratio caused by the pixel define layer, which is necessary to prevent short circuits from anode and cathode overlap but reduces display efficiency.

Innovation Solution

A method involving the formation of an anode electrode layer with obtuse angles and circular arcs, achieved through ion bombardment and plasma treatment, allowing complete coverage by the organic electroluminescent layer without the need for a pixel define layer, thus preventing short circuits and enhancing aperture ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a pixel define layer is used to prevent short circuits, then reliability is improved, but the aperture ratio is reduced

Engineering Contradiction:

Improveshort circuit preventionVSAvoidaperture ratio

Core Design Contradiction:

ReliabilityVSArea of moving object

Solution Approach 1:

The invention extracts and removes the pixel define layer from the OLED structure. By using ion bombardment to directly modify the anode electrode layer corners, the patent eliminates the need for the separate pixel define layer that was previously required to prevent short circuits, thereby increasing the aperture ratio while maintaining reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of adding a pixel define layer on top of the anode to prevent short circuits, the invention inverts the approach by directly modifying the anode electrode layer itself through ion bombardment to create rounded corners. This prevents the need for an additional layer while achieving the same short circuit prevention function

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of manufacture

If the anode electrode layer has sharp corners, then manufacturing is simpler, but short circuits occur due to overlap with cathode

Engineering Contradiction:

Improveanode electrode layer formationVSAvoidshort circuit prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention performs preliminary action by applying ion bombardment to the anode electrode layer corners before depositing the cathode layer. This pre-rounding of corners ensures that when the cathode is subsequently deposited, there will be no overlap at the corners, preventing short circuits while maintaining manufacturing simplicity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention introduces ion bombardment as an intermediary process between anode formation and cathode deposition. This intermediary step modifies the anode corner geometry to prevent the harmful overlap effect that would otherwise occur between the anode and cathode layers

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This approach prevents short circuits between the anode and cathode while eliminating the need for a pixel define layer, thereby improving the aperture ratio and yield of the OLED display.

Implementation Method 1

performing ion bombardment on the anode electrode layer and the passivation layer

Methodology Applied

Scientific EffectIon bombardment: Ion Beam

Implementation Method 2

the corner of the anode electrode layer is subject to a plasma treatment

Methodology Applied

Scientific EffectPlasma treatment: Plasma

Data Source

PatentUS11171301B2Organic light emitting diode and method for fabricating the same

Publication Date: 2021.11.09 BOE TECHNOLOGY GROUP CO LTD

AI summary

A method for fabricating the organic light emitting diode includes providing a substrate, forming an anode electrode layer on the substrate, forming a passivation layer on the anode electrode layer, the passivation layer having an area smaller than that of the anode electrode layer, performing ion bombardment of the anode electrode layer and the passivation layer, and removing the passivation layer.