Array Substrate Interface Layer for Flat Transparent Electrodes

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Solution Overview

Problem

In fringe-field switching liquid crystal display panels, the chemical vapor deposition of silicon nitride films on transparent electrodes like ITO leads to hydrogen radical reactions, causing surface bulging and reduced transmittance due to In precipitation, which affects the flatness and performance of the electrodes.

Innovation Solution

An interface protection layer with reduced hydrogen content is introduced between the transparent oxide electrode and the insulating layer, preventing hydrogen radicals from reacting with the electrode surface, thereby maintaining the flatness and enhancing the transmittance of the transparent oxide electrode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If chemical vapor deposition process is used to deposit silicon nitride film on transparent electrode, then insulating layer is formed, but hydrogen radical reaction causes surface bulging and reduced transmittance

Engineering Contradiction:

Improveflatness of contact interfaceVSAvoidhydrogen radical reaction

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An interface protection layer is introduced as an intermediary between the transparent electrode and the silicon nitride insulating layer. This protection layer prevents hydrogen radicals generated during chemical vapor deposition from directly reacting with the transparent electrode surface, thereby eliminating surface bulging and maintaining both flatness and transmittance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If chemical vapor deposition with hydrogen-containing gas is used, then silicon nitride insulating layer is formed, but microscopic bulging occurs on the surface

Engineering Contradiction:

Improvedeposition processVSAvoidsurface flatness

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The interface protection layer serves as a mediator that allows the chemical vapor deposition process to proceed using hydrogen-containing gas while preventing the harmful effect of hydrogen radical reaction on the transparent electrode. This enables maintenance of surface flatness without compromising the ease of manufacture.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The interface protection layer is formed in advance before the silicon nitride insulating layer deposition. This preliminary action prepares the surface to withstand the subsequent chemical vapor deposition process without suffering from hydrogen radical damage, ensuring surface flatness is maintained throughout manufacturing.

Inventive Principle:

Principle #10Preliminary action

3Quantity of substance

If transparent electrode is exposed to hydrogen-containing gas during deposition, then insulating layer is deposited, but transmittance of transparent electrode is reduced

Engineering Contradiction:

Improveinsulating layer coverageVSAvoidtransmittance

Core Design Contradiction:

Quantity of substanceVSIllumination intensity

Solution Approach 1:

The interface protection layer acts as a protective intermediary that allows complete coverage of the insulating layer to be deposited via chemical vapor deposition while preventing hydrogen radicals from reacting with the transparent electrode. This preserves the transmittance of the transparent electrode while ensuring full insulating layer coverage.

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

The interface protection layer effectively prevents In precipitation, improving the flatness and transmittance of the transparent oxide electrode, ensuring better performance and reducing the occurrence of bulging phenomena.

Implementation Method 1

When a chemical vapor deposition process is used to deposit an insulating layer such as a silicon nitride film on the transparent electrode

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Implementation Method 2

a hydrogen-containing gas in a chamber will contact an interface of the transparent electrode and cause a chemical reaction

Methodology Applied

Scientific EffectHydrogen radical reaction: Reduction

Data Source

PatentUS20250102870A1Array substrate and manufacturing method thereof and liquid crystal panel

Publication Date: 2025.03.27 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

An array substrate includes a substrate, a gate electrode, a gate insulating layer, an active layer, a pixel electrode, a source electrode and a drain electrode, an interface protection layer, a first insulating layer, and a common electrode; the interface protection layer is disposed on a side of the pixel electrode away from the gate insulating layer, the first insulating layer is disposed on a side of the interface protection layer away from the pixel electrode; and the common electrode is disposed on a side of the first insulating layer away from the interface protection layer.