Display Bank Pigment Composition for Reflectivity and Optical Density

Solution Overview

Problem

Display apparatuses face challenges in achieving high reflectivity and optical density simultaneously, leading to color mixing between pixels and reduced light efficiency due to the trade-off between these properties, particularly in high-resolution displays with narrow pixel distances.

Innovation Solution

Incorporating a bank with a specific composition that includes non-white pigments at 20-50 wt% and a scattering agent, optimized for particle size and weight ratio, to enhance reflectivity and optical density while preventing color mixing and maintaining patternability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a bank with high reflectivity is used, then light efficiency is improved, but optical density decreases causing color mixing between pixels

Engineering Contradiction:

Improvelight efficiencyVSAvoidcolor mixing between pixels

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating different regions within the bank structure: a first bank region with high reflectivity (containing white pigment and scattering agent) to improve light efficiency, and a second bank region with high optical density (containing colored pigment) to prevent color mixing. This spatial differentiation allows each region to optimize for its specific function without compromising the other.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining multiple pigments (white pigment, scattering agent, and colored pigment) in specific weight ratios within the bank composition. The white pigment and scattering agent provide high reflectivity, while the colored pigment adds optical density. This composite approach allows simultaneous achievement of both high light efficiency and high optical density by leveraging the complementary properties of different materials.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If optical density is increased to prevent color mixing, then color purity is improved, but light efficiency decreases

Engineering Contradiction:

Improvecolor purityVSAvoidlight efficiency

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by creating different regions within the bank structure: a first bank region with high reflectivity (containing white pigment and scattering agent) to improve light efficiency, and a second bank region with high optical density (containing colored pigment) to prevent color mixing. This spatial differentiation allows each region to optimize for its specific function without compromising the other.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining multiple pigments (white pigment, scattering agent, and colored pigment) in specific weight ratios within the bank composition. The white pigment and scattering agent provide high reflectivity, while the colored pigment adds optical density. This composite approach allows simultaneous achievement of both high light efficiency and high optical density by leveraging the complementary properties of different materials.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If non-white pigment is added to increase optical density, then color mixing is reduced, but reflectivity decreases

Engineering Contradiction:

Improvecolor mixingVSAvoidreflectivity

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent applies local quality by creating different regions within the bank structure: a first bank region with high reflectivity (containing white pigment and scattering agent) to improve light efficiency, and a second bank region with high optical density (containing colored pigment) to prevent color mixing. This spatial differentiation allows each region to optimize for its specific function without compromising the other.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining multiple pigments (white pigment, scattering agent, and colored pigment) in specific weight ratios within the bank composition. The white pigment and scattering agent provide high reflectivity, while the colored pigment adds optical density. This composite approach allows simultaneous achievement of both high light efficiency and high optical density by leveraging the complementary properties of different materials.

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 solution effectively increases reflectivity and optical density of the bank, reducing color mixing between pixels and enhancing light efficiency, while maintaining excellent patternability and stepper align key recognition rates in high-resolution displays.

Implementation Method 1

Incorporating a bank with a specific composition that includes non-white pigments at 20-50 wt% and a scattering agent, optimized for particle size and weight ratio, to enhance reflectivity and optical density

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS20250098472A1Display apparatus

Publication Date: 2025.03.20 SAMSUNG DISPLAY CO LTD

AI summary

Provided is a display apparatus including a plurality of banks, wherein the plurality of banks each include at least one non-white pigment, and an amount of the at least one non-white pigment is about 20 wt % to about 50 wt %, based on a total weight of the bank.