Reflection Control Layer as Storage Capacitor Electrode
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Solution Overview
Problem
Existing organic light-emitting display apparatuses face challenges in increasing the capacitance of storage capacitors while maintaining a high aperture ratio without adding extra electrode layers, which affects the efficiency and brightness of the display.
Innovation Solution
The design incorporates a reflection control layer with a metal and dielectric layer structure, where a portion of the metal layer forms the first electrode of the storage capacitor, and a second area with a lattice structure or holes is patterned to prevent parasitic capacitance, allowing the second and third electrodes to be on the same layer as the active and gate electrodes, respectively, and connected via a contact hole, enhancing capacitance without additional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate electrode layer is added to increase storage capacitor capacitance, then the capacitance increases, but the aperture ratio decreases and the device structure becomes more complex
Solution Approach 1:
The patent merges the storage capacitor electrode with the reflection control layer by making the first electrode of the storage capacitor coincide with a portion of the metal layer in the reflection control layer. This integration eliminates the need for separate electrode layers while maintaining both the reflection function and the storage capacitor function, thereby increasing aperture ratio without sacrificing capacitance
Solution Approach 2:
The metal layer in the reflection control layer serves dual purposes: it provides the reflection control function and simultaneously forms the first electrode of the storage capacitor. This multi-functionality allows the same structural element to fulfill multiple roles, reducing overall device complexity and improving aperture ratio
2Reliability
If a separate electrode layer is added to increase storage capacitor capacitance, then the capacitance increases, but the device structure becomes more complex
Solution Approach 1:
The patent combines the storage capacitor electrode structure with the reflection control layer structure, making them share common layers. Specifically, the first electrode of the storage capacitor is formed by a portion of the metal layer that would otherwise be dedicated solely to reflection control, thereby reducing the total number of electrode layers and simplifying the device structure
Solution Approach 2:
The metal layer is designed to serve multiple functions simultaneously: it provides optical reflection control and forms the first electrode of the storage capacitor. This multi-functionality reduces the need for additional dedicated electrode layers, thereby decreasing device complexity
3Area of stationary object
If the metal layer is used as the storage capacitor electrode, then the aperture ratio improves, but parasitic capacitance may increase
Solution Approach 1:
The metal layer is divided into distinct functional areas: a first area that forms the first electrode of the storage capacitor and a second area that maintains the reflection control function. This segmentation allows the capacitor function and reflection function to be separated spatialally within the same layer, reducing unwanted electrical interactions and parasitic capacitance
Solution Approach 2:
Different portions of the metal layer are assigned different functions based on local requirements. The first area has capacitor electrode properties while the second area maintains reflection properties. This local differentiation optimizes performance by ensuring each region performs its intended function without interfering with other functions
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 increases the storage capacitor's capacitance and improves the aperture ratio, making the organic light-emitting display apparatus suitable for high-resolution displays like megapixel displays while maintaining a thin and lightweight form factor.
Implementation Method 1
a reflection control layer disposed on the substrate and including a metal layer and a dielectric layer
Data Source
AI summary
An organic light-emitting display apparatus, including a substrate, a reflection control layer disposed on the substrate and including a metal layer and dielectric layer, a thin-film transistor disposed on the reflection control layer and including an active layer, a gate electrode, a source electrode, and a drain electrode, a storage capacitor disposed on the reflection control layer and including a first electrode and a second electrode, a pixel electrode connected to one of the source electrode and the drain electrode, an intermediate layer disposed on the pixel electrode and including an organic emission layer, an opposite electrode disposed on the intermediate layer, in which a portion of the metal layer of the reflection control layer comprises the first electrode of the storage capacitor.