Inorganic Cover Layer Gas Permeability in Color Filter Substrates

Solution Overview

Problem

The existing color filter substrates in display panels face challenges with gas release during the cell-assembling process, leading to increased evacuation time, afterimages, air bubbles, and Zara defects due to the use of organic materials that allow micromolecular gases to escape.

Innovation Solution

A color filter substrate with an inorganic cover layer made of materials like SiNx, SiO2, or their combinations, applied on a planarization layer to prevent gas release, reducing the evacuation time and improving assembly efficiency by using methods such as CVD or LPCVD for layer formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If organic materials are used in the color filter substrate, then ease of manufacture is improved, but gas release occurs during cell-assembling leading to increased evacuation time and reduced productivity

Engineering Contradiction:

Improveease of manufactureVSAvoidcell-assembling efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent changes the material parameter from organic to inorganic (specifically low-permeability inorganic materials such as silicon nitride SiNx or silicon oxide SiO2) to fundamentally alter the gas permeability characteristic. This parameter change reduces the gas permeability coefficient, thereby preventing micromolecular gas escape during cell assembly and reducing evacuation time without compromising manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material structure by combining the inorganic cover layer (SiNx or SiO2) with the existing color filter substrate layers (pixel resin layer, planarization layer). This composite structure leverages the low gas permeability of inorganic materials while maintaining the functional properties of the organic layers below, achieving both manufacturing feasibility and improved cell-assembling efficiency

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If organic materials are used in the color filter substrate, then ease of manufacture is improved, but gas release causes afterimages and air bubbles reducing display quality

Engineering Contradiction:

Improveease of manufactureVSAvoidafterimages and air bubbles

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material parameter from organic to inorganic (specifically low-permeability inorganic materials such as silicon nitride SiNx or silicon oxide SiO2) to fundamentally alter the gas permeability characteristic. This parameter change reduces the gas permeability coefficient, thereby preventing micromolecular gas escape during cell assembly and reducing evacuation time without compromising manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of trapped gases (which cause afterimages and air bubbles) into a benefit by using the inorganic cover layer to prevent gas escape in the first place. The inorganic layer acts as a barrier that transforms the problematic gas release behavior into a controlled environment where gases are contained and can be properly evacuated, eliminating display defects

Inventive Principle:

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

3Ease of manufacture

If organic materials are used in the color filter substrate, then ease of manufacture is improved, but gas release increases Zara defects

Engineering Contradiction:

Improveease of manufactureVSAvoiddefect rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the material parameter from organic to inorganic (specifically low-permeability inorganic materials such as silicon nitride SiNx or silicon oxide SiO2) to fundamentally alter the gas permeability characteristic. This parameter change reduces the gas permeability coefficient, thereby preventing micromolecular gas escape during cell assembly and reducing evacuation time without compromising manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies beforehand cushioning by introducing the inorganic cover layer as a preventive barrier before gas release problems can occur. This layer pre-empts the harmful effects of gas permeation by blocking the escape path of micromolecular gases during cell assembly, thereby preventing Zara defects and improving reliability before issues can arise

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 inorganic cover layer significantly reduces gas escape, decreasing evacuation time, minimizing afterimages and air bubbles, and lowering the risk of Zara defects, thereby enhancing the display panel's assembly efficiency and quality.

Implementation Method 1

The first inorganic cover layer formed on the first planarization layer can effectively prevent gas releasing from the pixel resin layer and the first planarization layer

Methodology Applied

Scientific EffectPhysical barrier (gas permeability control):

Data Source

PatentUS10139667B2Color filter substrate provided with inorganic cover layer and display panel comprising same

Publication Date: 2018.11.27 BOE TECHNOLOGY GROUP CO LTD

AI summary

Provided are a color filter substrate provided with an inorganic cover layer and a display panel including the same. The color filter (CF) substrate includes a base substrate; a black matrix and a pixel resin layer both formed on the base substrate; a planarization layer formed on the black matrix and the pixel resin layer; and an inorganic cover layer formed on the planarization layer.