Behavioral Model of Patterned Vertical Alignment Pixel in Active-Matrix Liquid Crystal Displays

Abstract

This paper proposes a more accurate behavioral circuit model to predict transient responses of an active-matrix liquid crystal display (AMLCD) with a patterned vertical alignment (PVA) mode. In the case of the PVA mode, we observed that simulation errors increase when the conventional circuit model is directly applied to overdriven static and dynamic data transitions. To overcome this issue, we investigate the actual behavior of the liquid crystal (LC) molecules in the PVA AMLCD pixel using a high-speed camera attached to a microscope. We discovered that the behavior of the LC molecules is significantly dependent on their proximity to the edges of transparent electrodes. Based on this investigation, we propose a first-order circuit model that has two LC groups with two different response characteristics. The proposed model is embedded in a circuit simulator using an analog hardware description language. Simulation results show that the transient optical responses are considerably more accurate than the conventional responses for any data transitions, including overdriven transitions.Index Terms-Behavioral circuit model, fringe field effect, liquid crystal display (LCD), SPICE simulation.

Behavioral Circuit Models of Stereoscopic 3-D Liquid Crystal Displays and Shutter Glasses

“…To describe the optical and electrical behaviors, the macro-models of an LC cell are investigated, which is suitable for circuit simulation [10]. In our previous works, we successfully developed a behavioral circuit model by applying a first-order macromodel to Manuscript active-matrix LCD (AMLCD) panels such as twisted nematic, in-plane switching, and patterned vertical alignment (VA) modes [11]- [14]. Moreover, we confirmed that this macromodel could be applied to an AMLCD with an even more complex pixel structure, such as the charge-shared VA (CS-VA) mode [13].…”

Temperature-dependent behavioral model of pixels in active-matrix liquid crystal displays with fringe-field switching mode

“…To solve these problems, we successfully developed a behavioral circuit model of AMLCDs by applying a first-order circuit system. [9][10][11][12][13] In this model, the first-order circuit system is represented by a simple resistor-capacitor (RC) circuit. Further, the behavioral circuit model's universality is verified over many types of LC modes, such as the twisted nematic, in-plane switching (IPS), patterned vertical alignment, and charge-shared vertical alignment modes.…”