Array Substrate Interface Protection for Transparent Electrode Flatness

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Solution Overview

Problem

In fringe-field switching liquid crystal display panels, the deposition of a silicon nitride film on a transparent electrode using chemical vapor deposition leads to a chemical reaction with hydrogen-containing gases, resulting in microscopic bulging and reduced transmittance due to the uneven contact interface.

Innovation Solution

An array substrate is designed with an interface protection layer between the transparent oxide electrode and the first insulating layer, which reduces the hydrogen content and prevents direct contact between hydrogen radicals and the transparent oxide electrode, thereby maintaining the flatness and transmittance of the electrode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If chemical vapor deposition is used to deposit silicon nitride film on transparent electrode, then insulating layer is formed, but microscopic bulging occurs and transmittance is reduced

Engineering Contradiction:

Improveflatness of contact interfaceVSAvoidmicroscopic bulging

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An interface protection layer is introduced as an intermediary between the transparent oxide electrode and the silicon nitride insulating layer. This protection layer prevents direct contact between hydrogen radicals during chemical vapor deposition and the transparent electrode surface, thereby preventing the chemical reaction that causes microscopic bulging while still allowing the insulating layer to be formed effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The interface protection layer creates a protective environment that shields the transparent oxide electrode from hydrogen-containing gases during the chemical vapor deposition process. By establishing this inert barrier, the harmful chemical reaction between hydrogen radicals and the transparent electrode is prevented, maintaining surface flatness.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Ease of manufacture

If chemical vapor deposition with hydrogen-containing gas is used, then silicon nitride film is deposited, but chemical reaction with transparent electrode causes microscopic bulging

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 gases while preventing the harmful chemical reaction with the transparent electrode. This enables easy manufacturing through standard deposition processes while maintaining high surface flatness precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If direct contact between hydrogen radicals and transparent oxide electrode occurs, then chemical reaction happens, but transmittance is reduced

Engineering Contradiction:

Improvetransmittance of transparent electrodeVSAvoidprecipitation of In

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The interface protection layer acts as a mediator that blocks hydrogen radicals from directly contacting the transparent oxide electrode, preventing the chemical reaction that would cause precipitation of In and reduce transmittance, while still allowing the necessary insulating layer formation to occur.

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 implementation of the interface protection layer effectively prevents the precipitation of In on the transparent oxide electrode, improving the flatness of the contact interface and enhancing the transmittance of the transparent oxide electrode.

Implementation Method 1

an interface protection layer disposed on a side of the transparent oxide electrode away from the substrate... prevents direct contact between hydrogen radicals and the transparent oxide electrode

Methodology Applied

Scientific EffectPhysical barrier protection:

Implementation Method 2

When a chemical vapor deposition process is used to deposit an insulating layer such as a silicon nitride film on the transparent electrode, a hydrogen-containing gas in a chamber will contact an interface of the transparent electrode and cause a chemical reaction

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS20250138376A1Array substrate and manufacturing method thereof and liquid crystal panel

Publication Date: 2025.05.01 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 source electrode and a drain electrode, a first insulating layer, a transparent oxide electrode, an interface protection layer, and a second insulating layer; the first insulating layer is disposed on a side of the source electrode and the drain electrode away from the active layer; the transparent oxide electrode is disposed on a side of the first insulating layer away from the substrate; the interface protection layer is disposed on a side of the transparent oxide electrode away from the substrate; and the second insulating layer is disposed on a side of the interface protection layer away from the transparent oxide electrode.