Compared with regular MOSFET devices, the body bias effect in HVMOS is usually more pronounced. In addition to the regular threshold voltage increase with body bias, the LDD region of the HVMOS typically also has a significant body bias dependence. Also, the VBS dependence of mobility degradation with the transversal electric field needs to be taken into account. Due to these particularities, modeling of HVMOS devices with body contact requires careful consideration of body bias dependencies. Semi-empirical compact models make use of extra model parameters in order to achieve the needed body bias dependence accuracy. In the case of physics-based compact models, such as HiSIM_HV2, the effect of body bias can be naturally and accurately considered, with very few such extra parameters.

Dual-Gate Thin Film Transistors (DGTFTs) are often used in pixel driver and peripheral circuits for liquid crystal displays. This is because of the reduction of the gate-off state leakage current as well as the kink effect [1,2]. Recently it has been also necessary to consider the problems caused by 3D effects such as the IV characteristics hump effect [3] and leakage current at the edge of the active region [4,5]. This requires 3D simulation of DGTFT characteristics in a reasonable time. However, simulation of DGTFTs is generally difficult, particularly in 3D, because of the electrical floating region between the dual TFTs. This region can cause difficult convergence when calculating the gate-off state characteristics including the Gate-Induced Drain Leakage (GIDL) current. In this article, we demonstrate that our 3D TCAD simulation framework, Victory, can simulate a normal DGTFT and an L-shape DGTFT [2] in 3D accurately, robustly and in a reasonable simulation time.