OLED Anode Cell Leakage Current Suppression
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) display devices experience leakage current issues due to electric field concentration at the interface between the anode cell isolator and the anode structure, which affects the performance and efficiency of the devices.
Innovation Solution
An anode cell array unit is designed with an insulating interlayer, an anode structure, and a leakage current suppressing layer pattern that surrounds the sidewall of the anode cell isolator, forming a T-shaped cross section to effectively suppress leakage currents. The anode structure includes a first metal layer for light reflection and a second metal layer with a work function of 4.0 eV or more, and the leakage current suppressing layer is made of silicon oxide to address the issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anode cell isolator is formed by filling a trench penetrating through the anode structure with an insulating material, then the pixel isolation function is achieved, but leakage current is generated in the corner region between the anode cell isolator and the anode structure due to electric field concentration
Solution Approach 1:
The patent applies local quality by creating a protrusion structure at the corner region between the anode cell isolator and anode structure. This protrusion locally modifies the geometric configuration to redistribute the electric field density, preventing concentration at the corner and thereby suppressing leakage current while maintaining effective pixel isolation.
Solution Approach 2:
The patent introduces a third dimension by forming a protrusion that extends upward from the anode structure surface. This dimensional addition creates a new geometric configuration that alters electric field distribution patterns, moving the field concentration issue from a two-dimensional corner interface to a three-dimensional distributed pattern that reduces peak field intensity.
2Manufacturing precision
If the anode cell isolator penetrates through the anode structure, then effective cell definition is achieved, but electric field concentration occurs at the interface corner region causing leakage current
Solution Approach 1:
The protrusion structure is localized at the corner region where the anode cell isolator intersects with the anode structure. This local geometric modification specifically addresses the electric field concentration issue at the interface without compromising the overall penetration depth and cell definition accuracy of the isolator.
Solution Approach 2:
The protrusion acts as an intermediary structure between the anode cell isolator and the anode structure. It provides a transitional geometric form that mediates the electric field distribution at the interface, preventing direct concentration at the corner while maintaining the isolator's penetration function.
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 suppresses leakage currents at the interface region, enhances light reflection characteristics, and maintains uniform thickness of the anode cell isolator during the manufacturing process, improving the overall performance and efficiency of the OLED display device.
Implementation Method 1
a leakage current suppressing layer pattern disposed on the anode structure to surround a sidewall of the anode cell isolator to be configured to suppress a leakage current that occurs in an area adjacent to an interface between the anode cell isolator and the anode structure
Implementation Method 2
an anode structure disposed on the insulating interlayer, and electrically connected to the active element... The anode structure includes a first metal layer for light reflection
Data Source
AI summary
An anode cell array unit for an organic light emitting diode display. The anode cell array unit is disposed on a substrate structure unit including an active element for each pixel, and has an organic light emitting unit is disposed thereon. The anode cell array unit may include an insulating interlayer disposed on the substrate structure unit, and configured to be isolated from the active element, an anode structure disposed on the insulating interlayer, and electrically connected to the active element, an anode cell isolator being arranged to penetrate through the anode structure and to protrude upward from the anode structure, and being configured to define a plurality of cells by isolating the pixels from each other, and a leakage current suppressing layer pattern disposed on the anode structure to surround a sidewall of the anode cell isolator to be configured to suppress a leakage current that occurs in an area adjacent to an interface between the anode cell isolator and the anode structure