A MATLAB-Based Simulator for Amorphous Silicon and Polycrystalline Silicon Thin Film Transistor
High-performance active matrix organic light emitting diode (AMOLED) display is driven by a matrix of thin film transistors (TFTs) as a back plane technology. Nowadays, the majority of large area AMOLED display uses a-Si:H TFT and Poly-Si TFT to control t
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Abstract High-performance active matrix organic light emitting diode (AMOLED) display is driven by a matrix of thin film transistors (TFTs) as a back plane technology. Nowadays, the majority of large area AMOLED display uses a-Si:H TFT and Poly-Si TFT to control the driving current in each and every pixels of AMOLED display. AMATLAB-based simulator for a-Si:H and poly-Si based thin film transistor (TFT)is proposed to address the pixel of AMOLED display. The purpose to design the simulator is to provide a ready reference of the output parameters of conventional (mentioned above) TFTs for the optimization of fabrication processes. This simulator is able to explain transfer characteristics, output characteristics and field effect mobility for both the TFTs.
Keywords a-Si:H TFT Poly-Si TFT MATLAB based graphical user interface Transfer characteristics Output characteristics and field effect mobility
1 Introduction Amorphous silicon TFT [1] and polycrystalline silicon TFT [2] are the two backplane technologies used as a switching device in AMOLED display [3]. Earlier a-Si:H TFT dominated in back plane technology market for large area electronic display but due to its low mobility slowly a-Si:H TFT was replaced by poly-Si TFT. But due to higher cost poly-Si TFT is mainly used in small display technology. S. Das (&) S. Datta S. Chatterjee (&) Department of Electronics and Communication Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majitar, India e-mail: [email protected] S. Chatterjee e-mail: [email protected] S. Datta e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 A. Kalam et al. (eds.), Advances in Electronics, Communication and Computing, Lecture Notes in Electrical Engineering 443, https://doi.org/10.1007/978-981-10-4765-7_76
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In this context, a semi-empirical MATLAB-based modelling was introduced in previous work [4]. In this work, a MATLAB-based graphical user interface (GUI) simulator (TFT) is reported for a-Si:H TFT and poly-Si TFT which has not been reported yet in the other literature. In this paper, we are introducing our TFT simulator in MATLAB software environment with its own GUI to obtain the transfer characteristics, output characteristics and mobility which has a good settlement with the experimental data reported in the other published article. The advantage of user interface is referred to a ready information regarding the performance of TFTs (a-Si:H TFT and poly-Si TFT)to optimize the design as well as selection of materials based on the properties. The objective of this work is to make an easy understanding of TFT using a semi-empirical model-based simple simulator. This simulator has the ability to take the input from user and generates the characteristic curve.
2 Software Structure A MATLAB GUI-based TFT simulator is proposed here. It will simulate its m-file program when the software will get inputs from the user. The GUI interface is simple and user friendly which will provide the following
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