OLED Capacitor High Dielectric Layer Structure
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Solution Overview
Problem
Current organic light emitting diode (OLED) displays face challenges in maximizing the capacity of capacitors, which are crucial for efficient operation, due to limitations in dielectric constants and material stability during manufacturing processes.
Innovation Solution
A capacitor structure is developed with a substrate, a substrate insulation layer, and a capacitor insulating layer having a higher dielectric constant than the substrate, using materials like zirconium oxide and molybdenum alloy with nickel, which suppresses the formation of undesired oxide layers and maintains thermodynamic stability, thereby maximizing capacitor capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional capacitor structure with standard dielectric materials is used, then the manufacturing process is simple, but the capacitor capacity is insufficient
Solution Approach 1:
The patent employs a composite dielectric structure consisting of a first dielectric layer (high dielectric constant material such as hafnium oxide or zirconium oxide) and a second dielectric layer (low dielectric constant material such as silicon oxide or silicon nitride). This composite structure maximizes capacitor capacity by utilizing the high dielectric constant of the first layer while the second layer provides manufacturing stability and suppresses unwanted oxide formation, thereby resolving the contradiction between increasing capacity and maintaining structural simplicity.
Solution Approach 2:
The patent changes the dielectric constant parameter by selecting materials with significantly different dielectric properties for the two layers. The first dielectric layer uses materials with high dielectric constants (hafnium oxide, zirconium oxide) to increase capacity, while the second layer uses materials with lower dielectric constants to provide stability. This parameter differentiation allows the capacitor to achieve higher capacity without excessive structural complexity.
2Quantity of substance
If high dielectric constant materials are used to increase capacitor capacity, then the capacity is maximized, but undesired oxide layers form during manufacturing
Solution Approach 1:
The second dielectric layer acts as an intermediary protective layer between the high dielectric constant material and the manufacturing environment. This layer prevents direct exposure of the first dielectric layer to oxygen and other reactive substances during manufacturing processes, thereby suppressing the formation of undesired oxide layers while allowing the first layer to maintain its high dielectric constant properties for maximum capacitor capacity.
Solution Approach 2:
The patent applies the second dielectric layer beforehand to protect the first dielectric layer from oxidative damage during subsequent manufacturing steps. This preventive measure ensures that the high dielectric constant material remains stable and free from unwanted oxide formation, maintaining both capacity and reliability throughout the manufacturing process.
3Quantity of substance
If a single-layer dielectric structure is used, then the manufacturing process is simple, but the voltage drop is significant under heat
Solution Approach 1:
The two-layer dielectric structure provides thermal stability that a single-layer structure cannot achieve. The first layer (high dielectric constant) maintains capacitor capacity, while the second layer (low dielectric constant, thermally stable material) acts as a thermal buffer that reduces voltage drops under heat. This composite approach allows the capacitor to maintain both high capacity and voltage stability during manufacturing and operation.
Solution Approach 2:
The patent assigns different functional qualities to different layers: the first dielectric layer is optimized for high dielectric constant to maximize capacity, while the second dielectric layer is optimized for thermal stability and low oxide formation to maintain voltage under heat. This local differentiation of material properties allows each layer to perform its specific function, resolving the contradiction between capacity and thermal stability.
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 enhances the capacity of capacitors in OLED displays, ensuring stable operation and reduced voltage drops, even under heat during manufacturing, leading to improved display performance.
Implementation Method 1
a capacitor insulating layer coming into contact with the first capacitor electrode and the second capacitor electrode between the first capacitor electrode and the second capacitor electrode, and having a higher dielectric constant as compared to the substrate insulating layer
Data Source
AI summary
An organic light emitting diode display includes: a substrate; a substrate insulating layer on the substrate; a capacitor on the substrate insulating layer; a driving thin film transistor including a driving gate electrode connected to the capacitor; and an organic light emitting element connected to the driving thin film transistor, where the capacitor includes: a first capacitor electrode on the substrate insulating layer; a second capacitor electrode on the first capacitor electrode; a capacitor insulating layer between the first capacitor electrode and the second capacitor electrode and contacting the first capacitor electrode and the second capacitor electrode, the capacitor insulating layer having a higher dielectric constant than the substrate insulating layer; and an auxiliary electrode contacting at least one of the first capacitor electrode or the second capacitor electrode.