Organic Light Emitting Display Inter-Insulating Layer Parasitic Capacitance
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Solution Overview
Problem
Existing organic light emitting displays face challenges in achieving high image display quality due to parasitic capacitance issues caused by inorganic inter-insulating materials, which limit aperture ratio and increase signal delay.
Innovation Solution
The use of a layered structure with a first inter-insulating layer made of inorganic materials like silicon nitride and a second inter-insulating layer made of organic materials such as acryl-based polymers, where the second inter-insulating layer covers the second capacitor electrode and reduces parasitic capacitance by having a smaller dielectric constant and greater thickness, thereby minimizing signal delay and increasing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an inorganic inter-insulating layer is used, then manufacturing precision and stability are improved, but parasitic capacitance increases causing signal delay
Solution Approach 1:
The inter-insulating layer is divided into two separate layers: a first inter-insulating layer (inorganic material) formed before the capacitor electrode to ensure manufacturing precision and electrode positioning, and a second inter-insulating layer (organic material with low dielectric constant) formed after to minimize parasitic capacitance. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
The patent uses a composite structure combining inorganic material (first inter-insulating layer) and organic material (second inter-insulating layer) with different dielectric properties. The inorganic layer provides structural stability and precision, while the organic layer with lower dielectric constant reduces parasitic capacitance, achieving both manufacturing precision and signal integrity.
2Loss of time
If the inter-insulating layer thickness is increased to reduce parasitic capacitance, then signal delay is reduced, but aperture ratio decreases
Solution Approach 1:
The patent changes the dielectric constant parameter of the inter-insulating layer by using organic material with a lower dielectric constant than inorganic material. This allows achieving the required parasitic capacitance reduction with a thinner layer thickness, thereby maintaining a larger aperture ratio while still reducing signal delay.
3Loss of time
If conductive components are spaced farther apart to reduce parasitic capacitance, then signal delay is reduced, but device area increases
Solution Approach 1:
By changing the dielectric constant parameter to a lower value using organic material, the patent reduces parasitic capacitance without increasing the spacing between conductive components. This allows maintaining compact device area while achieving reduced signal delay through material property optimization rather than geometric expansion.
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 reduces parasitic capacitance and signal delay, enhancing image display quality by allowing closer spacing of conductive components and maintaining high aperture ratio, thus improving the overall performance of the organic light emitting display.
Implementation Method 1
the second inter-insulating layer made of organic materials such as acryl-based polymers, where the second inter-insulating layer covers the second capacitor electrode and reduces parasitic capacitance by having a smaller dielectric constant and greater thickness
Data Source
AI summary
An organic light emitting display includes a base substrate, an active layer on the base substrate, a gate insulating layer on the active layer, a gate electrode on the gate insulating layer, a first inter-insulating layer on the gate electrode, a second inter-insulating layer covering the first inter-insulating layer, source and drain electrodes on the second inter-insulating layer and connected to the active layer, a first electrode connected to the drain electrode, an organic light emitting layer on the first electrode, a second electrode facing the first electrode while the organic light emitting layer is between the first and second electrodes, and first and second capacitor electrodes facing each other while the gate insulating layer is between the first and second capacitor electrodes. The second inter-insulating layer makes contact with an upper surface of the second capacitor electrode through an opening formed on the first inter-insulating layer.