Organic Light Emitting Device with Segmented Electrodes
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Solution Overview
Problem
Large-area organic light emitting devices face challenges in maintaining uniform brightness due to varying brightness characteristics across different regions, primarily attributed to voltage drops and non-uniform voltage application.
Innovation Solution
The organic light emitting device incorporates a power unit that applies different voltages to central and peripheral electrode units, with the ability to individually control and sequence voltage application to maintain uniform voltage distribution across the device, thereby mitigating voltage drops and ensuring consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large area organic light emitting device is formed, then the device can be used for illumination purposes, but the brightness characteristic differs from region to region
Solution Approach 1:
The second electrode is divided into a central electrode unit and a peripheral electrode unit, allowing independent voltage control of different regions. This segmentation enables differential voltage application to compensate for the voltage drop across large areas, thereby maintaining uniform brightness throughout the device.
Solution Approach 2:
Different voltages are applied to different regions (central vs. peripheral) of the device. The power unit provides higher voltage to the central electrode unit and lower voltage to the peripheral electrode unit, creating locally optimized electrical conditions that result in uniform brightness across the entire large-area device.
2Illumination intensity
If different voltages are applied to central and peripheral electrode units, then uniform brightness is achieved, but the device complexity increases
Solution Approach 1:
The second electrode is segmented into central and peripheral units with distinct voltage application points. This segmentation, while adding structural elements, provides a systematic approach to voltage distribution that simplifies the control of large-area devices compared to attempting uniform voltage application across the entire electrode.
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 ensures uniform brightness across the entire organic light emitting device, enhancing light-emitting efficiency and simplifying the manufacturing process by reducing complexity and costs associated with auxiliary electrodes.
Implementation Method 1
An organic light emitting device generates a visible light from an organic material disposed between two electrodes when a voltage is applied to the electrodes
Data Source
AI summary
An organic light emitting device includes a first electrode formed over a substrate; an intermediate layer that is formed over the first electrode and includes an organic light emitting layer; a second electrode that includes a central electrode unit disposed in a central region and a peripheral electrode unit disposed in a peripheral region, the intermediate layer being disposed between the first and second electrodes; and a power unit configured to apply voltages to the first electrode and the second electrode. The power unit is configured to apply different voltages to the first electrode, the central electrode unit, and the peripheral electrode unit.