Display Electrode Structure for Orientation-Independent Light Emission

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Solution Overview

Problem

Existing display devices with light emitting elements face challenges in emitting light regardless of the orientation directions of these elements, leading to inefficiencies in light emission and potential manufacturing yield issues.

Innovation Solution

A display device configuration that includes a specific arrangement of electrodes and insulating layers, allowing current to flow in a specific direction through light emitting elements. This configuration includes first and second electrodes, insulating layers, and connection electrodes that electrically contact the light emitting elements, enabling light emission regardless of their orientation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If light emitting elements are arranged with specific orientation directions, then current can flow in a specific direction, but light emission efficiency decreases when orientation is not controlled

Engineering Contradiction:

Improvelight emission rate per unit areaVSAvoidlight emission consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a third connection electrode that can electrically contact light emitting elements regardless of their orientation direction. This electrode serves multiple functions: it provides electrical contact for vertically oriented elements through the opening, and for horizontally oriented elements through the side surface, making the electrical connection system universal and orientation-independent.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent transitions from a two-dimensional electrical contact system (top and bottom electrodes only) to a three-dimensional system by adding a third connection electrode that contacts the side surface of light emitting elements. This dimensional change enables electrical contact from multiple spatial directions, solving the orientation problem.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If multiple connection electrodes are added to contact light emitting elements from different directions, then light emission efficiency improves, but device complexity increases

Engineering Contradiction:

Improvelight emission rate per unit areaVSAvoidnumber of connection electrodes

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the electrical contact function into three distinct connection electrodes with specialized roles: first and second connection electrodes for vertical contact, and a third connection electrode for horizontal/side contact. This segmentation allows each electrode to be optimized for its specific contact direction while collectively solving the overall orientation problem.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The third connection electrode acts as an intermediary that bridges the gap between the traditional two-electrode system and light emitting elements with various orientations. It provides an additional contact pathway that mediates the electrical connection for elements that cannot be contacted by the top and bottom electrodes alone.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If light emitting elements are contacted only from top and bottom, then device structure remains simple, but elements with horizontal orientation cannot emit light effectively

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidlight emission rate per unit area

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent introduces dynamic adaptability to the electrical contact system, where the third connection electrode can accommodate light emitting elements with different orientation directions. This dynamic capability allows the system to adjust to various element orientations without requiring precise control during manufacturing, maintaining ease of operation while improving light emission productivity.

Inventive Principle:

Principle #15Dynamics

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 proposed solution enhances light emission efficiency and improves manufacturing yield by ensuring that light emitting elements can emit light effectively regardless of their orientation, thereby increasing the light emission rate per unit area.

Implementation Method 1

a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250204096A1Light emitting element and display device including the same

Publication Date: 2025.06.19 SAMSUNG DISPLAY CO LTD

AI summary

A display device comprises a first electrode and a second electrode on a substrate, a first insulating layer on the first electrode and the second electrode, light emitting elements on the first insulating layer each having a first end on the first electrode and a second end on the second electrode, a first connection electrode disposed on the first electrode and electrically contacting the first end of each of the light emitting elements, a second connection electrode disposed on the second electrode and electrically contacting the second end of each of the light emitting elements, a second insulating layer on the light emitting elements, the first connection electrode and the second connection electrode, and a third connection electrode disposed on the second insulating layer and electrically contacting the light emitting elements through an opening formed in the second insulating layer that partially exposes the light emitting elements.