Color Conversion Display Panel for Sub-Pixel Interference Control

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Solution Overview

Problem

High-resolution display devices face issues of sub-pixel interference and image quality degradation due to small distances between micro-LEDs, leading to shot mura and color shift, especially in flexible or stretchable panels where light can pass through gaps in bank structures.

Innovation Solution

A display panel design incorporating a first light-emitting element emitting blue or ultraviolet light, a color conversion layer to convert light into red, a color filter layer with specific transmittance properties, and an encapsulation layer to mitigate sub-pixel interference without a bank structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the distance between adjacent micro-LEDs is reduced to improve resolution, then display resolution is improved, but sub-pixels of different colors interfere with each other causing shot mura and color shift

Engineering Contradiction:

Improvedisplay resolutionVSAvoidsub-pixel interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A bank structure is introduced as an intermediary element between adjacent micro-LEDs of different colors. This bank structure acts as a mediator that blocks light from one sub-pixel from reaching adjacent sub-pixels, thereby preventing color interference and shot mura while allowing the micro-LEDs to remain at high-resolution spacing

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The bank structure is selectively positioned only between micro-LEDs of different colors, creating local light-blocking properties where needed. This localized approach prevents interference at critical interfaces while maintaining overall display resolution and not obstructing necessary light paths

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If a bank structure is used to block light between micro-LEDs, then sub-pixel interference is prevented, but the bank structure cannot be produced when distance between micro-LEDs is too small

Engineering Contradiction:

Improvesub-pixel interferenceVSAvoidbank structure fabrication

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The dimensions and geometry of the bank structure are optimized to match the specific pitch between micro-LEDs. By adjusting parameters such as bank width, height, and positioning, the structure remains manufacturable even at reduced distances between micro-LEDs, preventing interference without requiring impractically small fabrication features

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the display panel is made flexible or stretchable, then adaptability is improved, but light passes through gaps around the bank structure causing shot mura and color shift after deformation

Engineering Contradiction:

ImproveflexibilityVSAvoidlight leakage through gaps

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The bank structure is designed with preliminary considerations for flexible deformation. Its geometry and material properties are configured in advance to maintain effective light blocking even when the display bends or stretches, preventing gaps from forming that would allow light leakage during operation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bank structure utilizes composite material properties that combine light-blocking capability with flexibility. This allows the structure to maintain its light-blocking function while accommodating the mechanical deformation required for flexible display operation

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

Prevents sub-pixel interference and avoids image defects like shot mura and color shift by effectively filtering unwanted light wavelengths, enhancing image quality in high-resolution and flexible displays.

Implementation Method 1

The first color conversion layer covers the first light-emitting element and is configured to convert blue light and/or ultraviolet light into red light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

The first color filter layer covers and contacts a top surface of the first color conversion layer, and is configured to have a transmittance of 0% to 5% for blue light and/or ultraviolet light. The first color filter layer is configured to have a transmittance of 60% to 99% for red light

Methodology Applied

Scientific EffectSelective absorption: Absorption (EM radiation)

Data Source

PatentUS20250338679A1Display panel and manufacturing method thereof

Publication Date: 2025.10.30 AU OPTRONICS CORP

AI summary

A display panel including a circuit substrate, a first light-emitting element, a first color conversion layer, a first color filter layer, a second light-emitting element, and an encapsulation layer is provided. The first light-emitting element is configured to emit blue light and/or ultraviolet light. The first color conversion layer covers the first light-emitting element and is configured to convert blue light and/or ultraviolet light into red light. The first color filter layer covers and contacts a top surface of the first color conversion layer. The second light-emitting element is configured to emit blue light. The encapsulation layer surrounds the first light-emitting element, the first color conversion layer, the first color filter layer, and the second light-emitting element.