Display Pixel Structure with Conductive Partition Walls for Full Color

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Solution Overview

Problem

Existing head-mounted displays require multiple wavelength conversion layers to achieve full color display, complicating the fabrication process and increasing production costs.

Innovation Solution

A display device design that omits one or both of the red and green wavelength conversion layers by using a common electrode and partition walls with conductivity, allowing for efficient light emission and simplifying the fabrication process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple wavelength conversion layers are used to achieve full color display, then color accuracy is improved, but fabrication complexity and production costs increase

Engineering Contradiction:

Improvecolor accuracyVSAvoidfabrication complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and removes one or both of the red and green wavelength conversion layers from the display structure, relying on the blue light emitting elements and yellow wavelength conversion layer to achieve full color display through selective light emission and conversion, thereby simplifying the fabrication process while maintaining color accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The blue light emitting elements serve multiple functions by directly emitting blue light and also serving as the base for yellow wavelength conversion to produce green light, reducing the need for separate red and green light emitting elements and their associated wavelength conversion layers

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If multiple wavelength conversion layers are used to achieve full color display, then color accuracy is improved, but production costs increase

Engineering Contradiction:

Improvecolor accuracyVSAvoidproduction cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent removes redundant wavelength conversion layers (one or both of red and green layers) from the display structure, reducing material costs, manufacturing steps, and production complexity while maintaining full color display capability through the combination of blue light emission and yellow wavelength conversion

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a simplified structure with fewer wavelength conversion layers that can be manufactured more cheaply and efficiently, using the yellow wavelength conversion layer in combination with blue light emitting elements to achieve cost-effective full color display

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Device complexity

If a common electrode is used with partition walls to omit wavelength conversion layers, then fabrication complexity is reduced, but light emission efficiency may be affected

Engineering Contradiction:

Improvefabrication complexityVSAvoidlight emission efficiency

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent divides the display into separate pixel regions using partition walls between adjacent light emitting elements, preventing light leakage and maintaining color purity despite the simplified structure with fewer wavelength conversion layers, thereby preserving light emission efficiency while reducing fabrication complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The partition walls act as intermediary structures that separate light from adjacent pixels, ensuring that the simplified light emitting structure with common electrode and reduced wavelength conversion layers maintains efficient and directed light emission without cross-contamination between pixels

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables full color display without the need for additional wavelength conversion layers, reducing fabrication complexity and costs while maintaining color accuracy.

Implementation Method 1

a first light emitting element on the first pixel electrode and configured to emit first light, a second light emitting element on the second pixel electrode and configured to emit second light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

a common electrode on an upper surface of the first light emitting element and an upper surface of the second light emitting element

Methodology Applied

Scientific EffectLight transmission: Light

Data Source

PatentUS12453229B2Display device and method of fabricating the same

Publication Date: 2025.10.21 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a substrate; a first pixel electrode on the substrate; a second pixel electrode on the substrate and spaced apart from the first pixel electrode; a first light emitting element on the first pixel electrode and configured to emit first light; a first connection electrode on the second pixel electrode; a first partition wall between a side surface of the first light emitting element and a side surface of the first connection electrode; a second light emitting element on the first connection electrode and configured to emit second light; and a common electrode on an upper surface of the first light emitting element and an upper surface of the second light emitting element.