Transistor Assembly Using Switching Electrode as Driving Gate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing organic light emitting display panels face limitations in enhancing the storage capacitance without degrading the characteristics of the driving transistor, as reducing the thickness of the gate insulation layer improves the switching transistor but narrows the voltage range for gray levels, and the additional capacitance electrodes require a mask and reduce the storage capacitance area.
Innovation Solution
The solution involves using the first electrode of the switching transistor as the gate of the driving transistor, with a specific transistor assembly configuration that includes a substrate, switching and driving channels, insulation layers, and electrodes, allowing the first conductor part to overlap the driving active part and function as both the source of the switching transistor and the gate of the driving transistor, thereby increasing storage capacitance without reducing the gate insulation layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional capacitance electrodes and metal layers are added to increase storage capacitance, then the storage capacitance is increased, but the device complexity increases and the manufacturing process becomes more complex requiring additional masks
Solution Approach 1:
The first electrode of the switching transistor serves dual functions: as the source electrode for the switching transistor and as the capacitance electrode for storing charge. This multi-functionality eliminates the need for separate capacitance electrodes and reduces the number of manufacturing masks required, while still achieving adequate storage capacitance.
2Reliability
If additional capacitance electrodes are added to increase storage capacitance, then the storage capacitance is increased, but the area available for storage capacitance is reduced due to contact holes
Solution Approach 1:
The capacitance function is merged with the existing first electrode of the switching transistor. By utilizing the overlapping area between the first electrode and the driving transistor's channel region, the patent creates storage capacitance without requiring additional dedicated capacitance electrode structures, thereby maximizing the usable area.
Data Source
AI summary
Disclosed are a transistor assembly, an organic light emitting display panel including the same, and an organic light emitting display device including the organic light emitting display panel, in which a first electrode of a switching transistor is used as a gate of a driving transistor.