Display Electrode Branch Layout for Series LED Voltage Division

Solution Overview

Problem

Existing display devices face challenges in reducing the capacity of driving transistors and improving voltage-dividing efficiency and power loss due to line resistance, particularly in high-temperature environments.

Innovation Solution

A display device design featuring light-emitting elements connected in series between electrode branches, with a floating electrode between the electrode branches to reduce the capacity of driving transistors and enhance voltage-dividing efficiency and power loss reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If light-emitting elements are connected in parallel, then the driving transistor capacity can be reduced, but the voltage-dividing efficiency deteriorates and power loss due to line resistance increases

Engineering Contradiction:

Improvetransistor capacityVSAvoidpower loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The electrode structure is segmented into multiple electrode branches (first electrode branch, second electrode branch, third electrode branch) instead of using a single electrode. This segmentation allows the light-emitting elements to be connected in series between the branches, distributing the voltage across multiple segments while maintaining manageable current levels for the driving transistor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a conventional two-electrode parallel connection to a multi-branch three-dimensional electrode arrangement. By introducing electrode branches extending in different directions (first direction and second direction) from a common electrode stem, the patent creates a spatial distribution that enables series connection while maintaining compact layout, thus improving voltage-dividing efficiency without excessive current demands.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Manufacturing precision

If light-emitting elements are connected in series, then the voltage-dividing efficiency can be improved, but the transistor capacity must be increased

Engineering Contradiction:

Improvevoltage-dividing efficiencyVSAvoidtransistor capacity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The electrode structure is segmented into multiple electrode branches (first electrode branch, second electrode branch, third electrode branch) instead of using a single electrode. This segmentation allows the light-emitting elements to be connected in series between the branches, distributing the voltage across multiple segments while maintaining manageable current levels for the driving transistor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a conventional two-electrode two-dimensional connection to a multi-branch three-dimensional electrode arrangement. By introducing electrode branches extending in different directions (first direction and second direction) from a common electrode stem, the patent creates a spatial distribution that enables series connection while maintaining compact layout, thus improving voltage-dividing efficiency without excessive current demands.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If conventional electrode structure is used, then the device complexity is low, but the power loss due to line resistance increases

Engineering Contradiction:

Improveelectrode structureVSAvoidpower loss

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The electrode structure is segmented into multiple electrode branches (first electrode branch, second electrode branch, third electrode branch) instead of using a single electrode. This segmentation allows the light-emitting elements to be connected in series between the branches, distributing the voltage across multiple segments while maintaining manageable current levels for the driving transistor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode stem acts as an intermediary component that connects multiple electrode branches (first, second, and third branches) in a star-like configuration. This intermediary structure enables the series connection of light-emitting elements between different branches while providing a common reference point, thereby reducing the effective line resistance and power loss compared to direct long-distance connections.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP3826064B1Display device

Publication Date: 2025.02.26 SAMSUNG DISPLAY CO LTD

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AI summary

A display device is provided. The display device comprises a first electrode stem and a second electrode stem extended in a first direction and spaced apart from each other, at least one electrode branch branching off from the first electrode stem and extended in a second direction, a second electrode branch branching off from the second electrode stem and extended in the second direction, at least one third electrode disposed between the first electrode branch and the second electrode branch and one or more light-emitting elements disposed between the first electrode branch and the third electrode and between the third electrode and the second electrode branch, wherein the third electrode is extended in the second direction, and both ends of the third electrode in the second direction are spaced apart from the first electrode stem and from the second electrode stem, respectively.