Quantum Dot Partition Walls for Micro-LED Wavelength Conversion

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Solution Overview

Problem

Existing display technologies face challenges in achieving high photo-efficiency and absorption ratio in display devices, particularly in micro-LED devices, due to limitations in wavelength conversion structures.

Innovation Solution

A quantum dot color filter is developed using an ink composition that includes a wavelength conversion structure with partition walls defining spaces filled with quantum dot composites, enhancing light emission efficiency and absorption capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional wavelength conversion structures are used in micro-LED devices, then device complexity is reduced, but photo-efficiency and absorption ratio deteriorate

Engineering Contradiction:

Improvephoto-efficiencyVSAvoidwavelength conversion structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The wavelength conversion structure is segmented into multiple partition walls that divide the space into distinct regions. Each partition wall contains quantum dot composites with specific luminescent characteristics, allowing independent optimization of different wavelength conversions while maintaining overall structural organization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions within the wavelength conversion structure are assigned different quantum dot composites with tailored luminescent peak wavelengths. This local differentiation enables each zone to convert light wavelengths optimally for its specific function, improving overall photo-efficiency without requiring complete structural redesign.

Inventive Principle:

Principle #3Local quality

2Reliability

If quantum dot composites are dispersed in matrix without partition walls, then manufacturing simplicity is maintained, but absorption ratio and luminescent control deteriorate

Engineering Contradiction:

Improveabsorption ratioVSAvoidstructure fabrication complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Partition walls are formed in advance to define the spatial configuration before quantum dot composites are deposited. This preliminary structuring enables precise control over composite distribution and luminescent peak positioning, ensuring optimal absorption ratio while maintaining a systematic fabrication process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The partition wall structure serves as a template that guides the deposition and distribution of quantum dot composites. By copying the partition wall geometry into the composite arrangement, the structure automatically achieves optimal light absorption pathways without requiring complex post-processing alignment.

Inventive Principle:

Principle #26Copying

3Manufacturing precision

If partition wall height is increased to improve luminescent peak control, then wavelength conversion precision is improved, but manufacturing difficulty increases

Engineering Contradiction:

Improveluminescent peak controlVSAvoidpartition wall fabrication difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The partition wall height is optimized to a specific range (5-50 micrometers) that balances luminescent peak control capability with manufacturing feasibility. This parameter optimization ensures sufficient height for effective wavelength separation while remaining within standard fabrication tolerances for semiconductor processing.

Inventive Principle:

Principle #35Parameter changes

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 achieves improved photo-efficiency and absorption ratio, enabling high-definition display performance in micro-LED devices through optimized quantum dot distribution and luminescent peak control.

Implementation Method 1

a first quantum dot composite and a second quantum dot composite disposed in the first space and the second space, respectively... each quantum dot composite provides wavelength conversion for incident light from the light emitting element

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS12446373B2Display panel and production method thereof

Publication Date: 2025.10.14 SAMSUNG ELECTRONICS CO LTD

AI summary

A display panel including a wavelength conversion structure that includes a base structure including partition walls that define a first space and a second space, a first quantum dot composite disposed in the first space, and a second quantum dot composite disposed in the second space. The height of the partition wall is greater than or equal to about 5 micrometers and less than or equal to about 50 micrometers, and the first quantum dot composite provides a first top surface and the second quantum dot composite provides a second top surface. A production method for making the wavelength conversion structure uses a first ink composition that includes first quantum dots and a first matrix, and a second ink composition that includes second quantum dots and a second matrix.