Fast In-Plane Switching of a Liquid Crystal Cell Triggered by a Vertical Electric Field

Abstract

We propose a fast two-step switching method of a homogeneous-aligned liquid crystal (LC) cell, where a trigger pulse is applied to align LCs vertically for a moment before they are in-plane switched to show a bright state. Because LCs aligned vertically by a trigger pulse are in a transient state rather than the stable state, the turn-on becomes faster. The turn-off also becomes faster because the pulse forcibly aligns the LC vertically to show the dark state. Experimental results show that significant acceleration of the grey-to-grey response as well as onoff switching can be achieved by the proposed switching method. #

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

“…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.…”

Switchable liquid crystal grating with sub millisecond response

“…The FLC can be a potential candidate, because of the fast response time and less driving voltages, but due to some fundamental problems (viz., geometry defects, shock problem, poor contrast, etc), it is very hard to develop a real device. 5,13 On the other hand to increase the speed of the nematic LC devices, several methods, viz., fringe field effect, guest host effect, etc, have been proposed so far but the response time is typically limited to 1 ms. 17,18 However, recently, Morris et al have disclosed a fast switchable grating based on polymer stabilized short pitch chiral LC. 19 The characteristic switching time for this grating is 600 ls, whereas the required electric field is around 20 V/lm, which is relatively high.…”

“…1. On one substrate (bottom), the ITO was patterned similar to in plane switching (IPS) substrate with the electrode width and gap between two electrodes of 2 lm, 18 whereas continuous ITO has been used for the other substrate. Thus, the proposed structure is termed as three electrodes (A, B, and C in Fig.…”

Homogeneous-aligned high-transmission and fast-response liquid crystal display with three-layer electrodes

“…Recently, two crossed-grating surface substrates are used in vertically aligned LCD for simple domains; however, their fabrication is very complicated [4] . A fringefield switching, homogeneous-aligned, three-terminal LCD (FFS-3T LCD) has been used to achieve fast turnoff switching [5] based on the original three-terminal LCD with homeotropic alignment [6,7] . However, the low aperture ratio still exists because the width and gap of pixel electrodes are larger than the liquid crystal thickness.…”

“…However, the low aperture ratio still exists because the width and gap of pixel electrodes are larger than the liquid crystal thickness. As a result, the transmittance of this liquid crystal cell is very low (27%), which means that the transmission is only 0.11 if the maximum transmission of the parallel polarizers is 0.42 [5] . Therefore, the transmission needs to improve.…”