OLED Segments with Low-Transmittance Separating Region

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Solution Overview

Problem

Existing organic light-emitting diodes lack a sharp edge separation between light-emitting segments, resulting in blurred contrast between adjacent segments due to light propagation and scattering, which affects optical clarity and visual perception.

Innovation Solution

Incorporating a scattering layer with a separating region that has a transmittance of at most 20% for light generated in the segments, arranged in a transitional region between adjacent segments to suppress light propagation and create a sharp edge, ensuring high optical contrast.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a scattering layer is used to enhance light extraction, then light extraction efficiency is improved, but light propagation between adjacent segments occurs causing blurred edges

Engineering Contradiction:

Improvelight extraction efficiencyVSAvoidlight propagation between segments

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The scattering layer is segmented into multiple scattering sub-layers with different scattering coefficients. The first scattering sub-layer has a higher scattering coefficient than the second scattering sub-layer, creating distinct optical zones that prevent light propagation between segments while maintaining overall light extraction efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the scattering layer are assigned different scattering coefficients to achieve localized optical control. The region above the active area uses a higher scattering coefficient for efficient light extraction, while the region extending beyond the active area uses a lower scattering coefficient to suppress light propagation to adjacent segments, creating sharp edges.

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If segments are arranged adjacent to each other to increase density, then device area utilization is improved, but optical contrast between segments deteriorates

Engineering Contradiction:

Improvedevice area utilizationVSAvoidoptical contrast between segments

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The solution transitions from controlling light propagation in the horizontal plane to controlling it through vertical layering. By stacking multiple scattering sub-layers with different scattering coefficients at different depths, the patent achieves optical isolation between adjacent segments while maintaining their close horizontal arrangement, thus preserving both area utilization and optical contrast.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Illumination intensity

If a continuous scattering layer is used to maximize light scattering, then light scattering efficiency is improved, but sharp edge separation between segments is lost

Engineering Contradiction:

Improvelight scattering efficiencyVSAvoidsharp edge separation

Core Design Contradiction:

Illumination intensityVSShape

Solution Approach 1:

The scattering layer exhibits asymmetric optical properties in different spatial regions. The first scattering sub-layer with higher scattering coefficient is positioned to maximize overall light scattering, while the second scattering sub-layer with lower scattering coefficient is positioned to create sharp edge boundaries, creating an asymmetric multi-layer structure that achieves both goals simultaneously.

Inventive Principle:

Principle #4Asymmetry

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 effectively prevents light propagation between segments, achieving a sharp edge and high optical contrast, making the organic light-emitting diode appear contiguous and gap-free to the observer with enhanced visual clarity.

Implementation Method 1

a scattering layer that at least partially scatters the light generated in each of the segments

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS10121833B2Organic light-emitting diode

Publication Date: 2018.11.06 DOLYA HOLDCO 5 LTD

AI summary

An organic light-emitting diode includes at least two segments arranged adjacent to one another, a scattering layer that at least partially scatters the light generated in each of the segments, and at least one separating region located in the scattering layer, wherein the separating region has a transmittance for light generated in the segments of at most 20%, the separating region, when viewed in a plan view, is arranged in a transitional region between adjacent segments such that within the scattering layer propagation of light between the segments is suppressed, the segments include organic layer sequences each located between a first electrode and a second electrode, the segments are distant from one another in a direction parallel to the main directions of extension, and the scattering layer directly adjoins the first electrode which is light-transmitting and directly adjoins a transparent layer on a side remote from the first electrode.