In this paper, we discuss about the light leakage mechanism in the dark state of ADS mode LCDs. Based on the stress-optic law,we analyzed the phenomenon through several experiments and simulations. We have concluded that the main reason of the light leakage is the combined effect of the retardations from the stressed glass and the liquid crystal layer.
In the paper, we have improved the dark state light leakage caused by glass retardation from average level 2.4 to level 1.2 in ADS mode LCDs. We proposed several methods to reduce light leakage, including how to reduce stress between PS and array substrate and LC optical retardation Δnd optimization. All these proposed methods can be explained by glass stress and photo elastic theory.
Characteristic dark domains are observed around the tips of electrodes in in-plane switching-mode liquid crystal displays. In these domains, the liquid crystal molecules rotate in the reverse direction because of the radially distorted electric field. We found that these domains extend toward the central area when a higher voltage is applied. This article discusses these reverse-rotational domains.
Recently, numerous researches have been made on data compression for digital facsimile transmission and several papers reported on the coding system in which certain signal processing is applied to the local part of the original image before encoding. This facilitates the encoding and improves the data compression rate. This paper proposes a new system which utilizes a signal processing based on the majority principle. This system can be implemented relatively easily by hardware. The image quality reproduced by this system is quite acceptable and can be improved by high-density sampling. In this paper quantitative analysis is made based on the calculation of entropy and the ideal data compression rate when this signal processing system is used as a preprocessing. A considerable improvement of the data compression rate is shown. In addition, comparison between the proposed system and the existing conventional systems is made.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.