OLED Sub-Pixel Barrier Structure for Lateral Crosstalk Blocking
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Solution Overview
Problem
Lateral crosstalk among sub-pixels in OLED display panels due to lateral conductivity in organic layers affects display quality, particularly causing unwanted luminescence in adjacent sub-pixels.
Innovation Solution
Incorporation of barrier structures between light-emitting devices to generate an electric field perpendicular to the substrate plane, utilizing a dielectric and conductive layer configuration to control carrier movement and reduce lateral conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared light-emitting functional layer is used across multiple sub-pixels, then device complexity is reduced and manufacturing is simplified, but lateral crosstalk occurs between adjacent sub-pixels due to lateral conductivity in organic layers
Solution Approach 1:
The patent introduces barrier structures that segment the continuous organic light-emitting functional layer into isolated regions for each sub-pixel. These barrier structures physically divide the shared functional layer, preventing lateral carrier transport between adjacent sub-pixels while maintaining the overall shared architecture benefits.
Solution Approach 2:
The barrier structure acts as an intermediary element inserted between adjacent sub-pixels within the shared light-emitting functional layer. This intermediary blocks the harmful lateral carrier flow while allowing each sub-pixel to independently control its light emission, resolving the crosstalk issue without eliminating the shared layer configuration.
2Speed
If organic layers with high lateral conductivity are used, then carrier transport efficiency is improved, but unwanted carrier movement to adjacent sub-pixels increases causing display defects
Solution Approach 1:
The patent applies local quality by creating regions of high conductivity within each sub-pixel's light-emitting functional layer while introducing localized barrier structures at the boundaries between sub-pixels. This ensures efficient carrier transport where needed (within sub-pixels) while blocking lateral movement at critical interfaces.
Solution Approach 2:
The barrier structures segment the organic functional layer into discrete sub-pixel zones, allowing each zone to maintain high lateral conductivity for efficient carrier transport to its electrodes, while the barrier interfaces between zones prevent inter-sub-pixel carrier leakage.
3Object-affected harmful factors
If barrier structures are added between light-emitting devices, then lateral crosstalk is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The barrier structures are designed with dynamic control capabilities, allowing their electrical properties to be modulated. This enables the barriers to be conductive when needed for carrier injection and insulating when needed for crosstalk prevention, reducing the need for permanently complex static barrier structures.
Solution Approach 2:
The barrier structures serve multiple functions simultaneously: they act as lateral carrier blockers, vertical carrier transport pathways, and electrical isolation elements. This multi-functionality reduces the need for separate dedicated structures for each function, thereby limiting the increase in overall device complexity.
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 electric field blocks carrier movement between adjacent sub-pixels, preventing lateral crosstalk and enhancing display panel performance.
Implementation Method 1
The barrier structure is configured to generate, under control of an electrical signal, an electric field in a direction perpendicular to a plane where the barrier structure is located
Implementation Method 2
barrier structures, located on a film layer between the light-emitting functional layer and the base substrate, wherein an orthographic projection of the barrier structure on the base substrate is located between orthographic projections of light-emitting devices, adjacent to the barrier structure, on the base substrate
Data Source
AI summary
A display panel includes: a base substrate, light-emitting devices on the base substrate, and barrier structures. The light-emitting device includes: a first electrode and a second electrode arranged in a stacked manner, and a light-emitting functional layer between the first electrode and the second electrode. The barrier structures are located on a film layer between the light-emitting functional layer and the base substrate. The orthographic projection of the barrier structure on the base substrate is between the orthographic projections of adjacent light-emitting devices on the base substrate. The barrier structure is configured to generate, under the control of an electrical signal, an electric field in a direction perpendicular to a plane where the base substrate is located.