Cu2ZnSnTe Nanocrystalline Black Matrix for Displays

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Solution Overview

Problem

Conventional methods for forming black matrixes (BMs) in display technology face issues such as high reflectance, environmental pollution, and reduced display quality due to the use of chromium, and the poor dispersivity and large particle size of carbon black pigments, which affect film uniformity and adhesion.

Innovation Solution

A Cu2Zn0.14Sn0.25Te2.34 nanocrystalline solution with particle sizes between 5 to 20 nm is developed, which provides excellent light shielding performance and uniform dispersion, allowing for the formation of BMs with improved film adhesion and reduced thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If chromium is used as pigment for forming black matrixes by depositing and etching, then light shielding effect is achieved, but the process becomes complex and environmental pollution occurs due to Cr waste

Engineering Contradiction:

Improveprocess complexityVSAvoidenvironmental pollution

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The invention changes the material parameter from chromium metal to copper zinc tin tellurium alloy nanocrystallines, fundamentally altering the chemical composition to eliminate Cr waste and environmental pollution while maintaining light shielding functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces the mechanical depositing and etching process with a solution-based coating method, substituting complex mechanical operations with a simpler liquid application and drying process

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If black pigment is dispersed in resin layer to achieve light shielding, then the process is simplified, but particle size is large (micron level) causing poor dispersivity and affecting film uniformity and adhesion

Engineering Contradiction:

Improveprocess simplicityVSAvoidfilm uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The invention changes the particle size parameter from micron level to nanometer level (5-20 nm), which fundamentally improves dispersivity and film uniformity while maintaining the solution-based manufacturing simplicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite alloy material (copper zinc tin tellurium) with specific elemental composition ratios, creating a multi-element nanocrystalline composite that achieves both good dispersivity and light shielding performance

Inventive Principle:

Principle #40Composite materials

3Object-generated harmful factors

If usage amount of black pigment is increased to ensure good light shielding effect, then light shielding performance improves, but overall thickness of resin layer increases, reducing overall flatness of CF substrate and degrading display quality

Engineering Contradiction:

Improvelight shielding performanceVSAvoidresin layer thickness

Core Design Contradiction:

Object-generated harmful factorsVSLength of stationary object

Solution Approach 1:

The invention changes the particle size parameter to nanometer scale (5-20 nm), which increases the surface area to volume ratio and enhances light absorption efficiency per unit mass, allowing effective light shielding at reduced thickness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs a composite alloy nanocrystalline material with specific composition (Cu2Zn0.14Sn0.25Te2.34) that optimizes light absorption properties, achieving superior light shielding performance at lower concentrations and thicknesses compared to conventional carbon black pigments

Inventive Principle:

Principle #40Composite materials

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 nanocrystalline solution achieves effective light shielding within the ultraviolet-visible light range while maintaining a small thickness, enhancing display quality and reducing environmental impact compared to traditional methods.

Implementation Method 1

light within the ultraviolet-visible light range can be absorbed

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

the band gap of the Cu2Zn0.14Sn0.25Te2.34 nanocrystalline is 0.8 to 1.5ev

Methodology Applied

Scientific EffectBand gap absorption: Absorption (EM radiation)

Data Source

PatentEP3157064B1Cu2zn0.14sn0.25te2.34 nanocrystalline solution and preparation method thereof , photosensitive resin solution and black matrix preparation method, and color film substrate

Publication Date: 2020.05.06 BOE TECHNOLOGY GROUP CO LTD

Figure 1~2
Figure 3~4

AI summary

The present invention relates to a Cu2Zn0.14Sn0.25Te2.34 nanocrystalline solution, its preparation method, a photosensitive resin solution, a method for forming black matrixes (BMs), and a color filter (CF) substrate. As the particle size of nanocrystallines in the nanocrystalline solution is small and light within the ultraviolet-visible light range can be absorbed, the BMs formed by utilization of the nanocrystalline solution can obtain good light shielding performance while having a small thickness. In the nanocrystalline solution, the particle size of the nanocrystallines dispersed in the nanocrystalline solution is 5 to 20nm; the band gap of the nanocrystallines is 0.8 to 1.5ev, and the grain surface of the nanocrystallines has organic functional groups.