OLED Reflection Electrode Layout for Higher Storage Capacitance
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Solution Overview
Problem
Organic light emitting display devices (OLEDs) face challenges in securing sufficient storage capacitance as resolution increases, making it difficult to maintain voltage between electrodes effectively.
Innovation Solution
The OLED design incorporates a storage capacitor formed by a reflection electrode and a first electrode of the light emitting diode, with a dielectric layer in between, allowing for increased capacitance without additional electrodes, thus enhancing storage capacitance and layout flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution of the OLED is increased, then display quality is improved, but storage capacitance becomes insufficient
Solution Approach 1:
The patent merges the reflection electrode (initially serving only for light reflection) with the storage capacitor electrode function. The reflection electrode is electrically connected to the gate electrode of the driving transistor, and together with the first electrode and dielectric layer, forms a storage capacitor. This integration allows the same electrode structure to serve dual purposes: reflecting light to improve display quality and storing electrical charge to maintain voltage, thereby resolving the contradiction between high resolution and sufficient storage capacitance.
Solution Approach 2:
The reflection electrode is designed to perform multiple functions: (1) reflecting light to enhance light efficiency, (2) serving as one electrode of the storage capacitor, and (3) being electrically connected to the gate electrode for voltage maintenance. This multi-functionality allows the device to maintain high resolution while securing adequate storage capacitance without adding extra electrodes that would compromise pixel density.
2Reliability
If additional electrodes are added to increase storage capacitance, then storage capacitance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of adding separate electrodes for the storage capacitor, the patent combines the storage capacitor electrodes with existing structural elements. The reflection electrode serves as one electrode, the first electrode (anode of the organic light-emitting layer) serves as the other electrode, and a dielectric layer is formed between them. This merging approach increases storage capacitance while avoiding the complexity and cost associated with fabricating and connecting additional independent electrodes.
Solution Approach 2:
The existing electrodes in the OLED structure are made to serve dual purposes: the reflection electrode functions both as a light reflection element and as a storage capacitor electrode. This universality eliminates the need for dedicated storage capacitor electrodes, thereby reducing device complexity and manufacturing steps while still achieving the required storage capacitance for high-resolution displays.
3Reliability
If additional electrodes are added to increase storage capacitance, then storage capacitance is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the storage capacitor fabrication process with the existing OLED manufacturing process. The dielectric layer is formed between the reflection electrode and the first electrode using standard deposition techniques already employed in OLED production. This integration eliminates the need for separate manufacturing steps and additional materials that would be required if independent storage capacitor electrodes were added, thereby reducing manufacturing cost while improving storage capacitance.
Solution Approach 2:
By designing the reflection electrode to also function as a storage capacitor electrode, the patent eliminates the need for additional electrode materials and associated deposition processes. This reduces material costs, manufacturing complexity, and production time, making high-resolution OLEDs with sufficient storage capacitance more cost-effective to manufacture.
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 effectively secures the required storage capacitance, improves production efficiency, and reduces costs by eliminating the need for extra electrodes, while maintaining high resolution and light efficiency.
Implementation Method 1
a storage capacitor formed by a reflection electrode and a first electrode of the light emitting diode, with a dielectric layer in between
Implementation Method 2
a reflection electrode which is on the driving transistor, and is electrically connected to a gate electrode of the driving transistor
Data Source
AI summary
The present disclosure discloses an organic light emitting display device. The organic light emitting display device includes a substrate, a driving transistor, a reflection electrode, a dielectric layer, a first and second electrode, and an organic light emitting layer. The driving transistor is in each of a plurality of pixel regions which are defined on the substrate. The reflection electrode is on the driving transistor, and is electrically connected to a gate electrode of the driving transistor. The dielectric layer is on the reflection electrode. The first electrode is on the dielectric layer, and is electrically connected to a source electrode of the driving transistor, and faces the reflection electrode. The organic light emitting layer is on the first electrode. The second electrode is on the organic light emitting layer.