Electroluminescence Display Trench Isolation for Leakage Current
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Solution Overview
Problem
Electroluminescent displays face image quality deterioration and increased power consumption due to lateral leakage current between neighboring pixels, especially as pixel density increases and distances between pixels decrease.
Innovation Solution
The implementation of a trench structure with vertical and horizontal trenches surrounding each pixel, combined with an induction electrode at the intersection of these trenches, disconnects electrical connectivity in both directions and discharges lateral leakage current, preventing image distortion and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased and pixels are packed closer together, then display resolution is improved, but lateral leakage current between adjacent pixels increases causing image quality deterioration
Solution Approach 1:
The patent divides the continuous emission layer and charge generation layer into separate pixel regions by introducing vertical trenches and horizontal trenches. These trenches physically segment the layers, preventing lateral leakage current from spreading between adjacent pixels while maintaining high pixel density for high-resolution display.
Solution Approach 2:
The patent introduces an induction electrode as an intermediary element at the intersection of vertical and horizontal trenches. This induction electrode acts as a mediator to discharge lateral leakage current that occurs between pixels, converting the harmful leakage current into a controlled discharge path through the induction electrode to the substrate, thereby preventing image quality deterioration.
2Measurement precision
If pixel density is increased and pixels are packed closer together, then display resolution is improved, but power consumption increases due to lateral leakage current
Solution Approach 1:
The vertical and horizontal trenches segment the emission layer and charge generation layer, isolating electrical current paths within each pixel. This segmentation prevents lateral leakage current from spreading to neighboring pixels, thereby reducing unnecessary power consumption while maintaining high pixel density for high-resolution display.
Solution Approach 2:
The induction electrode serves as an intermediary that provides a controlled discharge path for lateral leakage current to the substrate. By directing leakage current through this intermediary path, the patent prevents the current from causing continuous power loss across pixel boundaries, thereby reducing overall power consumption in high-resolution displays.
3Object-affected harmful factors
If vertical trenches and horizontal trenches are introduced to block lateral leakage current, then image quality is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the functions of vertical trenches and horizontal trenches into a unified grid structure that simultaneously blocks lateral leakage current in both horizontal and vertical directions. This combined trench structure, along with the induction electrode, creates an integrated solution that achieves comprehensive leakage current suppression without requiring separate complex systems for each direction.
Solution Approach 2:
The induction electrode performs multiple functions: it serves as a discharge path for lateral leakage current, provides structural support at trench intersections, and maintains electrical isolation between pixels. This multi-functional element reduces the need for additional specialized components, thereby managing device complexity while improving image quality.
4Object-affected harmful factors
If emission layer and charge generation layer are disconnected by trenches, then lateral leakage current is prevented, but electrical connectivity between pixels may be affected
Solution Approach 1:
The vertical and horizontal trenches segment the emission layer and charge generation layer into discrete pixel regions, ensuring that each pixel's electrical pathways are isolated from neighboring pixels. This segmentation prevents lateral leakage current while maintaining reliable electrical connectivity within each individual pixel through properly designed conductive pathways.
Solution Approach 2:
The induction electrode acts as an intermediary that manages electrical connectivity by providing a controlled discharge path for leakage current to the substrate. This intermediary structure ensures that while layers are disconnected by trenches to prevent lateral leakage, the overall electrical system remains reliable through the induction electrode's mediation between pixel regions and the substrate.
Data Source
AI summary
An electroluminescence display can include a first pixel disposed at 1st row-1st column, a second pixel disposed at 1st row-2nd column, a third pixel disposed at 2nd row-1st column, and a fourth pixel disposed at 2nd row-2nd column, on a substrate. The display can further include a first vertical trench disposed between the first pixel and the second pixel, and a second vertical trench disposed between the third pixel and the fourth pixel. Also, the display can further include a first horizontal trench disposed between the first pixel and the third pixel, a second horizontal trench disposed between the second pixel and the fourth pixel, and an induction electrode disposed at an intersection portion. Further, the first vertical trench and the second vertical trench face each other, and the first horizontal trench and the second horizontal trench face each other.