Micro LED Sub-Pixel Isolation for High-Resolution Color Displays

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Solution Overview

Problem

Existing micro light-emitting display technologies face challenges in achieving high-resolution color images with efficient light emission, particularly in reducing sub-pixel size and preventing light leakage between pixels.

Innovation Solution

The development of a micro light-emitting display apparatus that includes a first semiconductor layer, an isolation structure, and light-emitting units configured to emit blue, green, and red lights. The light-emitting units feature a rod semiconductor layer with a specific geometry and a planarized structure, allowing for efficient light emission and reduced sub-pixel size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the sub-pixel size is reduced to achieve high-resolution display, then the display resolution is improved, but light leakage between pixels increases and manufacturing precision requirements worsen

Engineering Contradiction:

Improvedisplay resolutionVSAvoidlight leakage between pixels

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The isolation structure divides the semiconductor layer into separate regions for different sub-pixels, creating physical barriers that prevent light leakage while maintaining small sub-pixel sizes for high resolution

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The isolation structure is strategically positioned only between adjacent sub-pixels where light leakage occurs, rather than uniformly across the entire display, optimizing light isolation without compromising overall resolution

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the sub-pixel size is reduced to achieve high-resolution display, then the display resolution is improved, but the manufacturing precision requirements worsen

Engineering Contradiction:

Improvedisplay resolutionVSAvoidmanufacturing precision requirements

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The isolation structure is formed before the light-emitting layers are deposited, establishing precise boundaries in advance that guide subsequent manufacturing steps and reduce precision requirements for later processes

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The isolation structure extends vertically through the semiconductor layer, creating three-dimensional barriers that provide effective light isolation without requiring proportional increases in lateral manufacturing precision

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If conventional light-emitting structures are used, then the device complexity is low, but light emission efficiency worsens

Engineering Contradiction:

Improvedevice complexityVSAvoidlight emission efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The rod-shaped semiconductor structure with inclined surfaces redirects light emission paths, reducing total internal reflection and improving light extraction efficiency compared to conventional planar structures

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The semiconductor layer is transformed from a conventional planar geometry to a rod structure with specific dimensional parameters (width, height, inclination angles), optimizing light emission properties while maintaining manufacturing feasibility

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

This solution enables the creation of high-resolution color images with improved light efficiency and reduced sub-pixel size, enhancing the display's resolution and manufacturing process efficiency.

Implementation Method 1

a first active layer provided in a first sub-pixel among the plurality of sub-pixels... the first active layer is configured to emit blue light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

a second active layer provided on the rod semiconductor layer... the second active layer is configured to emit green light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

an isolation structure provided on the first semiconductor layer and configured to define a plurality of sub-pixels

Methodology Applied

Scientific EffectLight isolation: Physical Containment

Data Source

PatentUS12237365B2Micro light-emitting display apparatus and method of manufacturing the same

Publication Date: 2025.02.25 SAMSUNG ELECTRONICS CO LTD

AI summary

A micro light-emitting display apparatus and a method of manufacturing the same are disclosed The micro light-emitting display apparatus includes a first semiconductor layer, an isolation structure provided on the first semiconductor layer and configured to define a plurality of sub-pixels each configured to emit light, a first light-emitting unit including a first active layer provided in a first sub-pixel among the plurality of sub-pixels, and a second semiconductor layer provided on the first active layer, and a second light-emitting unit including a rod semiconductor layer provided in a second sub-pixel among the plurality of sub-pixels, a second active layer provided on the rod semiconductor layer, and a third semiconductor layer provided on the second active layer. The first active layer is configured to emit blue light and the second active layer is configured to emit green light.