Color Filter Bank Structure for Sub-Pixel Optical Isolation

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Solution Overview

Problem

Existing light emitting devices face challenges in effectively enclosing and separating emission areas of sub-pixels, leading to optical interference and residue formation, particularly when using subminiature light emitting elements with nano-scale to micro-scale sizes.

Innovation Solution

Incorporating a bank structure with a color filter material that encloses each emission area, including a color bank layer and a polymer organic bank layer, to block specific colors and prevent optical interference, while allowing controlled light passage through color filters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a bank structure is used to enclose emission areas, then optical interference is prevented, but manufacturing complexity increases

Engineering Contradiction:

Improveoptical interference preventionVSAvoidbank structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the bank structure with color filter material to create an integrated component that performs both enclosure and color filtering functions simultaneously. This merging reduces the number of separate components needed and simplifies the overall device structure while maintaining optical interference prevention

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The bank structure is designed to serve multiple functions: it encloses the emission area to prevent optical interference, provides color filtering through integrated color filter material, and maintains structural support. This multi-functionality reduces the need for separate components and simplifies the device architecture

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If color filter material is used in the bank structure, then color separation precision is improved, but manufacturing difficulty increases

Engineering Contradiction:

Improvecolor separation precisionVSAvoidbank formation difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The color filter material is pre-formed and then integrated into the bank structure during the manufacturing process. This preliminary preparation of the color filter material allows for precise color separation to be achieved while simplifying the overall manufacturing process by separating the color filter fabrication from the bank structure formation

Inventive Principle:

Principle #10Preliminary action

3Volume of moving object

If subminiature light emitting elements are used, then device miniaturization is achieved, but residue formation increases

Engineering Contradiction:

Improvelight emitting element sizeVSAvoidresidue formation

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The bank structure is designed with specific local characteristics including optimized geometry and integrated color filter material positioned precisely at the emission areas. This local optimization prevents residue formation by ensuring complete enclosure and proper light management at the miniaturized element locations

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 bank structure effectively prevents optical interference and residue formation, facilitating precise color separation and easy formation of desired shapes, enhancing the performance and reliability of light emitting devices.

Implementation Method 1

a color bank including a color filter material that blocks light of colors emitted from the first light emitting element, the second light emitting element, and the third light emitting element

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

including first color conversion particles that convert a color of light emitted from the first light emitting element to a first color

Methodology Applied

Scientific EffectQuantum dot color conversion: Photoluminescence

Data Source

PatentUS12374663B2Light-emitting device and display device including bank structures comprised of color filter material

Publication Date: 2025.07.29 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a first substrate including a first sub-pixel area, a second sub-pixel area, and a third sub-pixel area; a first sub-pixel including a first light emitting element disposed in the first sub-pixel area; a second sub-pixel including a second light emitting element disposed in the second sub-pixel area; a third sub-pixel including a third light emitting element disposed in the third sub-pixel area; and a bank disposed between the first sub-pixel, the second sub-pixel, and the third sub-pixel and enclosing an emission area of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel. The bank includes a color bank including a color filter material that blocks light of colors emitted from the first light emitting element, the second light emitting element, and the third light emitting element.