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http://dx.doi.org/10.3807/KJOP.2010.21.2.069

Fast Switching of a Polymer-networked Twisted Nematic Liquid Crystal Cell  

Jin, Hye-Jung (School of Electrical Engineering, Pusan National University)
Kim, Ki-Han (School of Electrical Engineering, Pusan National University)
Baek, Jong-In (School of Electrical Engineering, Pusan National University)
Kim, Jae-Chang (School of Electrical Engineering, Pusan National University)
Yoon, Tae-Hoon (School of Electrical Engineering, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.21, no.2, 2010 , pp. 69-73 More about this Journal
Abstract
We propose a method to enhance the response time of a twisted nematic liquid crystal (TN-LC) cell using an anisotropic polymer. Polymer networks are formed by the phase separation between a LC and a UV-curable polymer. A TN-LC cell is exposed to UV light after the mixture of LC and anisotropic polymer is injected into the TN-LC cell. As a result, turn-off time of a TN-LC cell can be decreased remarkably without any loss of the transmittance. The turn-off time of a TN-LC cell with pure LC was 16 ms, but those of polymer networked TN-LC cells were 12, 11, and 9 ms when the concentration of the polymer was 3, 5, and 10 wt%, respectively. Moreover, by virtue of the polymer network, the backflow effect and the delay time generated during the turn-off process disappeared.
Keywords
Twisted nematic; Liquid crystal display; Polymer network; Fast response;
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