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Chen Y.,University of Central Florida | Peng F.,University of Central Florida | Yamaguchi T.,Petrochemical Corporation | Song X.,Jiangsu Hecheng Display Technology Company | Wu S.-T.,University of Central Florida
Crystals | Year: 2013

We review recent progress in the development of high birefringence (Δn ≥ 0.12) negative dielectric anisotropy (Δε < 0) liquid crystals (LCs) for direct-view and projection displays. For mobile displays, our UCF-N2 (low viscosity, negative Δε, high Δn) based homogeneous alignment fringe-field switching (called n-FFS) mode exhibits superior performance to p-FFS in transmittance, single gamma curve, cell gap insensitivity, and negligible flexoelectric effect. For projection displays using a vertical alignment liquid-crystal-on-silicon (VA LCOS), our high birefringence UCF-N3 mixture enables a submillisecond gray-to-gray response time, which is essential for color sequential displays without noticeable color breakup. Our low viscosity UCF-N2 also enables multi-domain VA displays to use a thinner cell gap for achieving faster response time. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source


Yan J.,University of Central Florida | Chen Y.,University of Central Florida | Wu S.-T.,University of Central Florida | Song X.,Jiangsu Hecheng Display Technology Company
IEEE/OSA Journal of Display Technology | Year: 2013

A figure of merit (FoM), defined as the ratio of Kerr constant to response time, is used to characterize and compare the electro-optic performance of polymer-stabilized blue phase liquid crystals (BPLCs). Increasing the dielectric anisotropy of LC host enhances Kerr constant and lowers the operation voltage, but its associated high viscosity dramatically increases the response time. As a result, the FoM may not be necessarily higher. For a given BPLC device, an optimal temperature exists where FoM reaches maximum. The proposed FoM provides useful guidelines for optimizing BPLCs for display and photonic applications. © 2012 IEEE. Source


Zhu J.-L.,Shanghai JiaoTong University | Ni S.-B.,Shanghai JiaoTong University | Song Y.,Shanghai JiaoTong University | Zhong E.-W.,Shanghai JiaoTong University | And 8 more authors.
Applied Physics Letters | Year: 2013

A polymer-stabilized (PS) blue phase liquid crystal (BPLC) with fast response time and large Kerr constant is investigated by doping a low molecular weight monomer (N-vinylpyrrollidone) into a conventional PS-BPLC consisting of BPLC, RM257, and 1,1,1-trimethylolpropane triacrylate. With this polymer network system, Kerr constant and the response can be improved simultaneously. Compared to the conventional PS-BPLC, Kerr constant of the proposed PS-BPLC can increase by 54% and the response time can decrease by 23% at the same time. The contrast ratio can be kept at a high level, over 1000:1 at λ = 633 nm. © 2013 American Institute of Physics. Source


Patent
Jiangsu Hecheng Display Technology Co. | Date: 2014-03-12

The present invention provides a liquid crystal composition, the liquid crystal composition including at least one compound of general formula (I); at least one compound of general formula (II) that accounts for 5-75% of the total weight of the liquid crystal composition; at least one compound of general formula (III) that accounts for 0-25% of the total weight of the liquid crystal composition; and at least one compound of general formula (IV) that accounts for 5-75% of the total weight of the liquid crystal composition. The liquid crystal composition of the present invention has characteristics of great optical anisotropy, small viscosity, good low-temperature stability, high stability against ultraviolet rays and high thermal stability, is applicable to AM elements, and has characteristics such as a short corresponding time, great contrast and a long service life. The present invention further provides an active matrix liquid crystal display device including the liquid crystal composition.


Patent
Jiangsu Hecheng Display Technology Co. | Date: 2013-04-10

A liquid crystal composition and a liquid crystal display wherein the liquid crystal composition includes: a compound of general formula (I) including 1%-50% of the total weight of the liquid crystal composition; a compound of general formula (II) including 1%-60% of the total weight of the liquid crystal composition; a compound of general formula (III) including 1%-60% of the total weight of the liquid crystal composition; and a compound of general formula (IV) including 0-50% of the total weight of the liquid crystal compositionwherein the liquid crystal composition has a suitably wider nematic phase scope, a suitable optical anisotropy, a favorable low-temperature storage stability a faster response speed, can be used for outdoor work, has a good image display effect, and substantially free of streaking phenomenon.

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