Light-Emitting Element Bank Diffusion Layer for Color Mixing Control

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Solution Overview

Problem

Known light-emitting devices experience color mixing phenomena when emitting light of multiple colors, particularly in display devices, which degrade viewing angle characteristics.

Innovation Solution

Incorporating a light diffusion layer within a bank structure in the light-emitting element, which includes insulating properties and light diffusion particles, to suppress color mixing and enhance viewing angle characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a scattering film is disposed on the outermost surface on the light emission side, then light diffusion is improved, but color mixing phenomenon occurs between adjacent light-emitting elements

Engineering Contradiction:

Improvelight diffusionVSAvoidcolor mixing phenomenon

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the light diffusion function into two separate components: a scattering film on the light emission side and a light diffusion layer within the bank structure. This segmentation allows each component to perform its specific function - the scattering film provides general light diffusion while the light diffusion layer in the bank prevents color mixing by confining light to its respective pixel region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The light diffusion layer acts as an intermediary component between the light-emitting element and the external environment. It mediates the light propagation by diffusing light within the bank structure, preventing direct line-of-sight color mixing between adjacent pixels while maintaining the overall light emission characteristics.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If light diffusion is enhanced to improve viewing angle characteristics, then color mixing between adjacent pixels increases

Engineering Contradiction:

Improveviewing angle characteristicsVSAvoidcolor mixing phenomenon

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by placing the light diffusion layer specifically within the bank structure at predetermined positions, rather than uniformly across the entire device. This localized approach allows light diffusion to be enhanced in specific regions where it benefits viewing angle characteristics while preventing color mixing in adjacent pixel regions.

Inventive Principle:

Principle #3Local quality

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 light diffusion layer effectively reduces color mixing and improves viewing angle characteristics by limiting the range of light diffusion, thereby stabilizing electrode potential and enhancing display quality.

Implementation Method 1

a light diffusion layer located in the bank

Methodology Applied

Scientific EffectLight diffusion: Diffusion

Data Source

PatentUS20250344571A1Light-emitting element, display device, and method for manufacturing light-emitting element

Publication Date: 2025.11.06 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A light-emitting element includes a first electrode, a light-emitting layer located in an upper layer with respect to the first electrode, a second electrode located in an upper layer with respect to the light-emitting layer, a bank that is located in an upper layer with respect to the second electrode and has insulating properties, and a light diffusion layer located in the bank.