Oxide-Semiconductor Switching Transistor Gate Potential Stability
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Solution Overview
Problem
Current display devices face challenges in maintaining a constant gate potential of driving transistors, leading to flicker and vertical cross-talk, especially when the electrostatic capacity of storage capacitors is low or absent, which affects image quality and power consumption.
Innovation Solution
The use of oxide-semiconductor transistors for the first and second switching transistors, which have low leak currents, allows for the suppression of gate potential decrease even without a storage capacitor, enabling longer maintenance of the gate potential and reducing power consumption by decreasing the writing frequency of image signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a storage capacitor with high electrostatic capacity is used to maintain gate potential, then gate potential stability is improved, but device area increases
Solution Approach 1:
The invention extracts the essential function of charge storage from a physical capacitor component and implements it through the inherent capacitance of the gate electrode structure itself. The gate insulating film and gate electrode form an integrated capacitor that maintains gate potential without requiring a separate storage capacitor component, thereby eliminating the area penalty while maintaining stability.
Solution Approach 2:
The invention merges the capacitor function with the gate electrode structure by using the gate insulating film as the capacitor dielectric and the gate electrode as one terminal. This integration combines the switching function and charge storage function into a single structural unit, eliminating the need for separate components and reducing overall device area.
2Reliability
If the writing frequency of image signals is increased to maintain image quality, then image quality is improved, but power consumption increases
Solution Approach 1:
The invention implements a feedback mechanism where the gate potential is continuously maintained through the integrated capacitor structure, allowing the system to operate at lower writing frequencies while still maintaining image quality. The feedback loop ensures that charge is replenished only when necessary, reducing unnecessary power consumption associated with high-frequency writing operations.
3Area of stationary object
If the electrostatic capacity of storage capacitors is reduced to minimize device area, then device area is reduced, but gate potential stability deteriorates leading to flicker and vertical cross-talk
Solution Approach 1:
The invention extracts the charge storage function from a separate capacitor component and integrates it into the gate electrode structure. This eliminates the need for a dedicated storage capacitor that would occupy additional area, while the integrated structure maintains sufficient electrostatic capacity to prevent flicker and vertical cross-talk.
Solution Approach 2:
The invention changes the parameters of the gate electrode structure, specifically utilizing the gate insulating film thickness and material properties to optimize the capacitor effect. By adjusting these parameters, the system achieves adequate electrostatic capacity for gate potential stability without requiring additional area for separate capacitor components.
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 ensures a high-quality image with reduced flicker and vertical cross-talk, while also minimizing power consumption by maintaining the gate potential for a longer duration, even with low electrostatic capacitance or without a storage capacitor.
Implementation Method 1
The use of oxide-semiconductor transistors for the first and second switching transistors, which have low leak currents, allows for the suppression of gate potential decrease even without a storage capacitor
Data Source
AI summary
Disclosed is a display device including: a driving transistor, a first switching transistor, and a pixel transistor each having a gate and a pair of terminals; a storage capacitor having a pair of terminals; and a light-emitting element having an input terminal and an output terminal. One terminal of the driving transistor is electrically connected to one terminal of the pixel transistor. The other terminal of the driving transistor is electrically connected to one terminal of the first switching transistor and the input terminal of the light-emitting element. The other terminal of the first switching transistor is electrically connected to the gate of the driving transistor and one terminal of the capacitor. The one terminal of the capacitor overlaps with an active region of the driving transistor.