Oxide Semiconductor Transistor Charge Layer for Threshold Shift Control
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Solution Overview
Problem
Existing display devices with oxide semiconductor transistors face reliability issues due to unintended turn-on phenomena when signal values below a specific threshold are applied, leading to inefficiencies and potential device failure.
Innovation Solution
Incorporating a charge layer between the oxide semiconductor layer and the gate electrode in the transistor structure, which shifts the threshold voltage in a positive direction, thereby preventing the transistor from turning on at signal values lower than a specific threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional oxide semiconductor transistor structure is used, then the device can operate with simple structure, but unintended turn-on occurs when signal values below threshold are applied, reducing reliability
Solution Approach 1:
An intermediate layer is introduced between the gate electrode and the oxide semiconductor layer. This intermediate layer acts as a mediator that modifies the electric field distribution, preventing unintended turn-on of the transistor when signal values below the threshold are applied, thereby improving reliability without significantly complicating the overall device structure
Solution Approach 2:
The threshold voltage of the transistor is adjusted by modifying the properties of the intermediate layer, such as its thickness, material composition, or charge density. This parameter change ensures that the transistor only activates when the gate signal exceeds the modified threshold, preventing spurious turn-on events while maintaining structural 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
This configuration enhances the reliability of the display device by preventing unintended turn-on events, thereby improving the overall performance and longevity of the device.
Implementation Method 1
a first charge layer disposed between the first gate electrode and the first oxide semiconductor layer and overlapping at least a portion of the first channel area in a plan view
Data Source
AI summary
A display device includes a pixel and a driver electrically connected to the pixel. The driver may include first oxide semiconductor layer including a first source area, a first drain area, and a first channel area disposed between the first source area and the first drain area. The driver may include a first gate electrode disposed on the first oxide semiconductor layer and overlapping the first channel area of the first oxide semiconductor layer in a plan view. The driver may include a first charge layer disposed between the first gate electrode and the first oxide semiconductor layer and overlapping at least a portion of the first channel area in a plan view.