OLED Capacitor Electrode Segmentation for Uniform Doping
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Solution Overview
Problem
The manufacturing of organic light emitting display devices requires a large number of masking operations, leading to increased costs and potential issues with capacitor electrode uniformity and resistance due to coarse doping.
Innovation Solution
The device incorporates a thin-film transistor with an active layer, a capacitor with a bottom electrode formed on the same layer as the active layer and doped with an impurity, and a metal diffusion medium layer connected to the bottom electrode, reducing the number of masking operations and ensuring uniform doping through efficient impurity diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple regions are formed at once as a single layer to reduce the number of masking operations, then the number of masking operations is reduced, but the capacitor electrode cannot be uniformly doped and resistance increases
Solution Approach 1:
The capacitor electrode is divided into two separate layers: a first capacitor electrode layer formed with the active layer, and a second capacitor electrode layer formed separately afterward. This segmentation allows the first layer to be doped uniformly together with the active layer using a single masking operation, while the second layer is formed later to complete the capacitor electrode structure, thus resolving both the reduction in masking operations and the uniformity of doping
Solution Approach 2:
The first capacitor electrode layer is formed and doped simultaneously with the active layer in advance, before the second capacitor electrode layer is formed. This preliminary action ensures that the doping process is performed uniformly when the electrode structure is simpler, and the second layer is added later to complete the capacitor electrode without requiring additional doping operations
2Ease of manufacture
If a capacitor electrode is not uniformly doped, then the number of masking operations can be reduced, but electric resistance increases and desired capacitance cannot be secured
Solution Approach 1:
The capacitor electrode is segmented into two layers formed at different stages. The first layer is doped uniformly with the active layer in a single masking operation, ensuring low resistance, while the second layer is formed separately to complete the capacitor structure without requiring additional doping, thus maintaining both ease of manufacture and reliability
Solution Approach 2:
The electrode structure parameters are changed from a single-layer configuration to a two-layer configuration, allowing the doping process to be performed on the first layer with uniform parameters, while the second layer is added with different formation parameters to complete the electrode without additional doping, thus maintaining low resistance while simplifying the manufacturing process
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 approach minimizes the number of masking operations, reduces manufacturing costs, and prevents increases in resistance by ensuring uniform doping of the capacitor electrode, thereby maintaining desired capacitance and improving overall device performance.
Implementation Method 1
a metal diffusion medium layer, which is formed on the same layer as the source/drain electrodes and is connected to the bottom electrode
Data Source
AI summary
Provided are an organic light emitting display device and a method of manufacturing the same. The organic light emitting display device includes a thin-film transistor (TFT), which includes an active layer, a gate electrode, and source/drain electrodes; an organic electroluminescent device electrically connected to the TFT and includes a pixel electrode formed on the same layer as the gate electrode, an intermediate layer including an organic light emitting layer, and a counter electrode that are stacked in the order stated; and a capacitor, which includes a bottom electrode, which is formed on the same layer and of the same material as the active layer and is doped with an impurity; a top electrode formed on the same layer as the gate electrode; and a metal diffusion medium layer formed on the same layer as the source/drain electrodes and is connected to the bottom electrode.