Fast switching of polymer-stabilized liquid crystal pi cells

Abstract

This work demonstrates a dual-frequency polymer-stabilized liquid crystal pi cell with zero bias and a short response time. The high curing voltage and low curing intensity give the cell a low dark state and a high bright state, such that the transmittance against the applied voltage curve is steep. The response time is under 1ms and is independent of monomer concentration because a strong electric torque is exerted on the liquid crystals. The cell is useful in field-sequential color systems, and the low operating voltage of ∼5V makes the cell compatible with conventional thin film transistor driving voltages.

Fast Switching of Vertically Aligned Liquid Crystals by Low-Temperature Curing of the Polymer Structure

“…The maximum transmittance of a VA cell with pure LC was 33%. As the concentration of the RM was increased, the operating voltage increased and the transmittance decreased [17,18]. VA cells polymer-networked with RM concentrations of 0.2, 1, and 3 wt% showed maximum transmittances of 32.5%, 29.8%, and 27.7% respectively.…”

“…However, the response time of the VA mode is not sufficiently fast to realize high-quality video [11,12]. To reduce the response time several methods have been proposed [13][14][15][16][17][18][19][20][21][22][23][24], but they have drawbacks, such as a complicated driving scheme, complex fabrication process, and increase in the operating voltage. Moreover, there have been only a few studies of the fast switching of LCs at low temperature.…”

Electro-optical light scattering shutter using electrospun cellulose-based nano- and microfibers

“…Using cellulose-based nano and microfibers mats as a network, EO light-scattering devices were produced as polymer-stabilized liquid crystal-type devices. 7 An increase in the on transparency and a marked decrease in the operating voltage of these devices were observed as the consequences of the improved interaction of the NLC with the nano and microfibers.…”

High-brightness relaxed-bend state in a pi cell stabilized by synchronized polymerization

“…6 The second category is to stabilize the twist or bend state. 5,7,8,[10][11][12] However, in the former case, since the bend and twist states need different optical compensations, 13 it is difficult to exploit the full optical dynamic range of both the bend and twist states. Also, the switching time associated with the twist state is much longer than that of the bend state, which is thus undesirable for fast switching devices.…”

“…[5][6][7][8][9][10][11][12] These can be classified into three categories. The first category is one that uses the splay states instead of the bend states.…”