Thin Film Transistor Sub-threshold Swing Measurement via Operational Amplifier
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Solution Overview
Problem
The challenge in the field of display devices is achieving uniformity and high-quality illumination as electronic components shrink, requiring precise control of thin film transistors, but existing methods are inefficient in rapidly measuring sub-threshold swing, which is crucial for quality control.
Innovation Solution
A method involving the electrical connection of an operational amplifier and an anti-exponential component to a thin film transistor's source terminal, allowing for multiple gate voltage inputs and output voltage measurements, followed by a fitting process to determine the sub-threshold swing, facilitating precise and rapid quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional measurement methods are used for sub-threshold swing, then measurement process is simple, but measurement speed is slow and efficiency is low
Solution Approach 1:
An operational amplifier is introduced as an intermediary component to amplify the output signal from the thin film transistor. The operational amplifier converts small current changes into measurable voltage signals, enabling faster and more accurate sub-threshold swing measurements without directly modifying the thin film transistor structure.
Solution Approach 2:
The patent replaces conventional current measurement methods with voltage measurement through the operational amplifier. By converting current signals to voltage signals, the measurement system can operate at higher speeds with better precision, eliminating the limitations of direct current measurement.
2Measurement precision
If conventional measurement methods are used, then circuit configuration is simple, but measurement precision is insufficient
Solution Approach 1:
The operational amplifier acts as a signal conditioning intermediary that enhances measurement precision. It amplifies the微弱 current signals from the thin film transistor into robust voltage signals, allowing for precise sub-threshold swing characterization even with small signal variations.
Solution Approach 2:
The patent transforms the measurement parameter from direct current measurement to voltage measurement through the operational amplifier. This parameter transformation enables higher precision measurements by converting difficult-to-measure current signals into easily measurable voltage signals with better signal-to-noise ratio.
3Measurement precision
If multiple measurement points are collected for accurate fitting, then measurement accuracy improves, but measurement time increases
Solution Approach 1:
The operational amplifier enables continuous signal amplification and processing throughout the measurement process. Multiple measurement points can be collected continuously without interruption, maintaining high measurement speed while gathering sufficient data points for accurate fitting and characterization.
Data Source
AI summary
A method for rapidly gathering a sub-threshold swing from a thin film transistor is provided. The method includes: electrically connecting an operational amplifier and an anti-exponential component to a source terminal of the thin film transistor; performing a measuring process to the thin film transistor in which the measuring process is inputting multiple values of a gate voltage to a gate terminal, such that multiple values of an output voltage are correspondingly generated from the output terminal of the operational amplifier; and performing a fitting process to the output voltage corresponding to the thin film transistor in which the fitting process is fitting at least two of said multiple values of the output voltage to get the sub-threshold swing.