Transparent Storage Electrodes for OLED Aperture Ratio
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Solution Overview
Problem
The aperture ratio of organic light emitting display devices is limited by the need for opaque storage electrodes in pixel regions, which hinders the expansion of storage capacitor capacitance.
Innovation Solution
Forming storage electrodes using transparent electrode materials within the pixel region, allowing for increased aperture ratio and capacitance without additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If opaque storage electrodes are used in pixel regions, then the storage capacitor can be formed with sufficient capacitance, but the aperture ratio is reduced
Solution Approach 1:
The patent changes the material parameter of the storage electrode from opaque metal to transparent conductive material (such as ITO, IZO, or transparent conductive oxide). This parameter change allows the electrode to become transparent, increasing the aperture ratio while maintaining sufficient capacitance through optimized electrode area and thickness in the pixel region
Solution Approach 2:
The patent extends the storage electrode formation into the pixel region (spatial dimensionality change), allowing the electrode to overlap with the pixel area. This dimensional extension enables the aperture ratio to increase while the electrode still provides sufficient capacitance by utilizing the additional overlapping area
2Illumination intensity
If the aperture ratio is increased by using transparent electrodes, then more light can pass through, but the capacitance of the storage capacitor may be reduced
Solution Approach 1:
The patent compensates for the reduced capacitance from using transparent electrodes by extending the electrode area into the pixel region through overlapping structures. This dimensional extension in the spatial domain maintains sufficient total capacitance while allowing maximum light transmission through the transparent material
Solution Approach 2:
The patent employs composite electrode structures combining transparent conductive materials with optimized geometric configurations. The composite approach uses transparent materials for light transmission while structuring the electrode (through overlapping and area optimization) to maintain adequate capacitance
3Area of stationary object
If storage electrodes are formed in pixel regions, then the aperture ratio can be enhanced, but additional processing steps are required
Solution Approach 1:
The patent merges the storage electrode formation process with the existing pixel electrode formation process. By using the same transparent conductive material layer for both purposes and forming them through a single deposition process, the aperture ratio is enhanced without adding separate processing steps
Solution Approach 2:
The transparent conductive material layer serves multiple functions simultaneously: it acts as both the pixel electrode and the storage electrode. This multi-functionality allows the storage electrode to be formed in the pixel region without requiring additional dedicated processing steps, thereby enhancing aperture ratio while maintaining process simplicity
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
Enhances the aperture ratio and increases the capacitance of the storage capacitor by using transparent electrodes, improving the overall performance of the organic light emitting display device.
Implementation Method 1
forming storage electrodes using transparent electrode materials within the pixel region
Implementation Method 2
holes passing through the hole transport layer 30b and electrons passing through the electron transport layer 30d are drifted into the emission layer 30c, thereby generating excitons. In accordance therewith, the emission layer 30c can emit visible light
Data Source
AI summary
Disclosed is an organic light emitting display device. The organic light emitting display device includes: at least one transistor arranged in a transistor region of the substrate and configured to include a channel layer, an insulation film, a gate electrode, a source electrode and a drain electrode; a storage capacitor arranged in the storage capacitor region, the pixel region and the pad region of the substrate and configured to include a first storage electrode, an insulation film pattern and a second storage electrode; a color filter arranged over the storage capacitor opposite to the pixel region; and an organic light emitting diode arranged on the color filter and configured to include a first electrode, an organic emission layer and a second electrode.