OLED Common Electrode Openings Reduce Parasitic Capacitance
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Solution Overview
Problem
Organic electro luminescence displays face issues with reduced driving speed and increased power consumption due to parasitic capacitance generated between interconnections and the organic light emitting layer.
Innovation Solution
The design includes a substrate with an organic light emitting diode, scan, data, and power interconnections, where the common electrode has openings overlapping with these interconnections, minimizing parasitic capacitance by reducing the common electrode's area over the interconnections, thereby improving driving speed and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the common electrode is continuously formed over the interconnections, then the electrical connection is maintained, but parasitic capacitance increases reducing driving speed and increasing power consumption
Solution Approach 1:
The common electrode is extracted or removed from the regions overlapping with the interconnections. This eliminates the parasitic capacitance formed between the common electrode and interconnections, thereby improving driving speed and reducing power consumption while maintaining electrical connection in non-overlapping regions.
Solution Approach 2:
The common electrode is segmented into multiple regions: regions overlapping with organic light emitting diodes (where the electrode is formed to maintain electrical connection) and regions overlapping with interconnections (where the electrode is removed to reduce parasitic capacitance). This spatial segmentation resolves the contradiction between maintaining connection and reducing capacitance.
2Reliability
If the common electrode area is increased to improve electrical connection, then connection reliability improves, but parasitic capacitance with interconnections increases
Solution Approach 1:
The common electrode is selectively formed only in regions where it provides beneficial electrical connection (overlapping with organic light emitting diodes) and selectively removed from regions where it creates harmful parasitic capacitance (overlapping with interconnections). This local differentiation of electrode presence optimizes both reliability and reduces harmful effects.
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 enhances the driving speed and decreases power consumption of organic electro luminescence displays by minimizing parasitic capacitance, leading to improved electrical performance.
Implementation Method 1
Electrons and holes injected into an organic light emitting layer through a cathode and an anode are recombined to form excitons. Organic electro luminescence displays correspond to display devices using the phenomenon which generate light of predetermined wavelength by energy of the excitons.
Data Source
AI summary
An organic electro luminescence display is disclosed. In one embodiment, the display includes a substrate, an organic light emitting diode disposed on the substrate and including a pixel electrode, an organic light emitting layer, and a common electrode, a scan interconnection disposed on the substrate and providing a scan signal to the organic light emitting diode. The display may further include a data interconnection disposed on the substrate and providing a data signal to the organic light emitting diode, and a power interconnection disposed on the substrate and providing a power to the organic light emitting diode. The common electrode has an opening which overlaps with at least a portion of the scan interconnection, the data interconnection, and the power interconnection.