OLED Hole Injection Block Layout for Sub-Pixel Crosstalk

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Silicon-based OLED displays suffer from crosstalk between sub-pixels due to the low resistivity of the hole injection layer, which affects display quality.

Innovation Solution

The organic electroluminescent structure features an anode layer with an inner cutting structure and a hole injection layer partitioned into independent blocks, eliminating conduction between sub-pixels without requiring additional processing or high resistivity materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a common hole injection layer with low resistivity is used, then hole injection efficiency is improved, but crosstalk between sub-pixels occurs

Engineering Contradiction:

Improvehole injection efficiencyVSAvoidcrosstalk between sub-pixels

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The hole injection layer is segmented into isolated hole injection blocks corresponding to each anode, preventing lateral charge transport between adjacent sub-pixels while maintaining effective hole injection at each pixel location

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The continuous hole injection layer is extracted and replaced with discrete hole injection blocks, removing the conductive pathway that causes crosstalk while preserving the necessary hole injection function at each pixel

Inventive Principle:

Principle #2Taking out (Extraction)

2Object-affected harmful factors

If the hole injection layer resistivity is increased to reduce crosstalk, then crosstalk is reduced, but hole injection efficiency deteriorates

Engineering Contradiction:

Improvecrosstalk between sub-pixelsVSAvoidhole injection efficiency

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

By segmenting the hole injection layer into discrete blocks, the patent achieves both low resistivity within each block (for efficient hole injection) and electrical isolation between blocks (for crosstalk prevention), eliminating the need to increase overall layer resistivity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The hole injection blocks provide locally optimized properties: low resistivity at the anode interface for efficient hole injection, while the spacing between blocks provides high effective resistivity to prevent lateral charge transport and crosstalk

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If additional processing is added to isolate hole injection layers, then crosstalk is reduced, but device complexity increases

Engineering Contradiction:

Improvecrosstalk between sub-pixelsVSAvoidfabrication process complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The hole injection block formation is merged with the existing anode patterning process, using the same photomask and deposition steps to create both the anode structure and the corresponding hole injection blocks, eliminating the need for additional isolation processing

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12048179B2Organic electroluminescent structure and fabrication method thereof, and display device

Publication Date: 2024.07.23 BOE TECHNOLOGY GROUP CO LTD

AI summary

This disclosure relates to an organic electroluminescent structure and a fabrication method thereof, and a display device. The organic electroluminescent structure includes a base substrate; an anode layer formed on the base substrate, in which the anode layer comprises a plurality of anodes arranged at intervals; an organic light-emitting functional layer having a hole injection layer, in which the hole injection layer includes a plurality of hole injection blocks arranged at intervals, and each of the hole injection blocks is correspondingly formed on the second surface of one of the anodes; and a cathode layer formed at a side of the organic light-emitting functional layer facing away from the anode layer.