Segmented Bottom-Emitting OLED Capacitor Structure for ESD Protection
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Solution Overview
Problem
Segmented OLED devices, particularly those with small segments, are susceptible to electrostatic discharge (ESD) damage due to insufficient inherent capacitance, especially when not in operation, and existing ESD protection methods are costly or complicated to implement.
Innovation Solution
A segmented bottom-emitting OLED device with an array of OLED segments on a common substrate, featuring a transparent insulating layer and conductive layer under each segment forming a passive capacitor structure, increasing the total capacitance to protect against ESD without requiring additional power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional ESD protection circuitry is added to small OLED segments, then ESD protection is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the ESD protection function with the existing OLED structure by utilizing the OLED's inherent capacitance. The protective capacitor is integrated into the OLED stack, combining the light emission function and ESD protection function into a single structure, thereby avoiding additional separate protection circuitry and reducing overall device complexity
Solution Approach 2:
The OLED structure is designed to serve multiple functions: light emission during operation and ESD protection during non-operational states. The inherent capacitance of the OLED structure provides dual functionality, eliminating the need for separate dedicated ESD protection components and simplifying the overall device architecture
2Reliability
If a separate ESD protection capacitor is added, then ESD protection is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The protective capacitor is merged with the OLED structure, using the same fabrication processes and material deposition steps. The capacitor electrodes are formed as part of the OLED electrode structure, and the dielectric layers are deposited using the same processes, thereby simplifying manufacturing rather than adding separate steps
Solution Approach 2:
The OLED structure itself provides the ESD protection function through its inherent capacitance, eliminating the need for separate protection components. The device protects itself using its own structural properties, avoiding additional manufacturing complexity associated with separate protection circuitry
3Area of stationary object
If larger format OLED devices are used, then inherent capacitance increases, but ESD sensitivity decreases
Solution Approach 1:
The patent changes the electrical parameters of the OLED structure by utilizing the inherent capacitance formed by the electrode separation and organic dielectric layers. This parameter change enables small OLED segments to achieve sufficient capacitance for ESD protection without increasing their physical area, thereby resolving the contradiction between size and protection capability
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 passive capacitor structure enhances the device's capacitance, effectively dissipating electrostatic charges across multiple segments, reducing the risk of ESD damage and maintaining operational integrity.
Implementation Method 1
A segmented bottom-emitting OLED device with an array of OLED segments on a common substrate, featuring a transparent insulating layer and conductive layer under each segment forming a passive capacitor structure, increasing the total capacitance to protect against ESD
Implementation Method 2
Electrostatic discharge (ESD) is a sudden and momentary flow of electric current between two electrically charged objects. ESD can cause harmful effects of importance in industry, including failure of electronic components
Data Source
AI summary
A segmented bottom-emitting OLED device compromising an array of multiple OLED segments arranged on a common transparent substrate, where the array forms an emitting area where each segment is separated by a non-emitting gap; wherein each OLED segment is defined by a transparent bottom electrode segment, organic layers for light emission, and a top electrode; wherein between the bottom electrode and the substrate in at least one OLED segment, there is a transparent insulating layer that is closer to the bottom electrode segment and a transparent conductive layer that is closer to the substrate.