Light-Emitting Device Partition Structure for Crosstalk Prevention
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Solution Overview
Problem
The crosstalk phenomenon occurs in light-emitting panels with tandem elements, where current leaks from one tandem element to adjacent elements through highly conductive layers, leading to unwanted light emission and reduced lifespan due to increased current density.
Innovation Solution
Incorporating an insulating layer and a partition with a depression structure between electrodes, where the thickness of the intermediate and carrier-injection layers is reduced on inclined surfaces, increasing electrical resistance and preventing current flow between adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a highly conductive intermediate layer is provided in tandem elements to decrease driving voltage, then driving voltage is reduced, but current leaks to adjacent pixels causing crosstalk
Solution Approach 1:
The partition structure is designed with different thicknesses in different regions: thinner in the center region (over the light-emitting unit) to maintain electrical insulation, and thicker at the edge portions to provide mechanical support and containment. This local variation in thickness allows the partition to simultaneously achieve electrical insulation against crosstalk while maintaining structural integrity.
Solution Approach 2:
The partition acts as an intermediary insulating structure between adjacent tandem elements. It physically separates the highly conductive intermediate layers of neighboring pixels, preventing direct current leakage while allowing each pixel to maintain its low driving voltage through the intact intermediate layer within its own region.
2Illumination intensity
If tandem elements are stacked to increase luminance, then luminance is improved, but current density increases accelerating deterioration
Solution Approach 1:
The light-emitting element is divided into multiple independent light-emitting units stacked in series (tandem structure). Each unit operates at lower current density, and the total luminance is the sum of all units. This segmentation allows high luminance output while maintaining lower current density in each individual unit, reducing deterioration.
3Object-affected harmful factors
If the partition is made thicker to prevent crosstalk, then crosstalk is reduced, but manufacturing complexity increases
Solution Approach 1:
The partition thickness is optimized locally rather than uniformly: the center region has sufficient thickness for electrical insulation, while edge portions are thicker for mechanical support. This local differentiation achieves effective crosstalk prevention without unnecessarily increasing overall structural 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
This configuration effectively prevents crosstalk between adjacent pixels, maintaining high luminance while extending the lifespan of light-emitting elements by reducing current leakage and electrical conductivity.
Implementation Method 1
the thickness of the intermediate layer over an inclined surface of the first depression in a direction perpendicular to the inclined surface is smaller than the thickness of the intermediate layer over the first lower electrode in a direction perpendicular to the first lower electrode
Data Source
AI summary
Occurrence of a crosstalk phenomenon is prevented in a light-emitting device including a tandem element. The light-emitting device includes an insulating layer, a first lower electrode over the insulating layer, a second lower electrode over the insulating layer, a partition positioned over the insulating layer and between the first lower electrode and the second lower electrode, a first light-emitting unit over the first lower electrode, the partition, and the second lower electrode, intermediate layers over the first light-emitting unit, a second light-emitting unit over the intermediate layer, and an upper electrode over the second light-emitting unit. The partition has a first depression.