Precise prediction of optical responses of all types of liquid crystal displays by behavioral models

IEEE Trans. Electron Devices

2016

Self Cite

This paper proposes a new method to determine the overdrive (OD) values using a behavioral circuit model. Based on the accurate prediction of overdriven transitions in the behavioral circuit model, the proposed method enables us to obtain the OD values easily. The proposed method requires only three OD values to complete all the OD values. The estimated OD values agree with the measured OD values. The average OD deviation was only 1.60 over all data transitions. Index Terms-Behavioral circuit model, liquid crystal display overdrive (OD), response time.

Section: Resultssupporting

confidence: 65%

A Simple Overdrive Technology Using Behavioral Circuit Model for Liquid Crystal Displays

Jeon

IEEE Trans. Electron Devices

2016

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“…In this model, the first-order circuit system is expressed by a simple resistor-capacitor (RC). In addition, we verified the behavioral circuit model's universality over many types of LC modes, such as twistednematic, in-plane switching, PVA, and charge-shared VA modes [25], [26].…”

mentioning

confidence: 86%

“…To solve these problems, we successfully developed a behavioral circuit model of AMLCDs by applying a first-order circuit system [24]- [26]. In this model, the first-order circuit system is expressed by a simple resistor-capacitor (RC).…”

mentioning

confidence: 99%

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

IEEE Trans. Electron Devices

2014

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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.

“…However, we have already verified that this model can be applied to the IPS mode. 11 In this paper, we investigate the relationship between the behavioral characteristics of FFS mode and the ambient temperature. A behavioral model developed by considering a unique pixel structure of FFS mode is expected to be reported in the near future.…”

Section: Review Of De Smet's Macro-modelmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

2015

Opt. Eng

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Abstract. This paper proposes a temperature-dependent behavioral circuit model to predict the optical characteristics of an active-matrix liquid crystal display with a fringe-field switching (FFS) mode. The optical responses of liquid crystal displays (LCDs) are strongly affected by their ambient temperature. We optimized the time-constant parameters that describe the movement of liquid crystal molecules so that simulated optical responses of FFS LCD provide the best fit to the measured responses over the temperature range of 0 to 50°C. It is found that these time-constant parameters have a linear relationship with the ambient temperature, which enables the prediction of optical responses at any given temperature. The simulation results of the transient responses show an excellent match with the measured results regardless of the ambient temperature. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.