Normal and Reverse Mode Light Scattering Properties in Nematic Liquid Crystal Cell Using Polymer Stabilized Effect

Abstract

A coexistence with normal and reverse scattering modes is demonstrated in a single liquid crystal (LC) cell by using a polymer stabilized effect. The homogeneously oriented or twisted LC cell containing a small amount of reactive mesogen is exposed with UV light under a suitable curing voltage application. A light scattering state is obtained and it becomes clear by applying voltage. The cell fabricated without the curing voltage shows a reverse mode property, that is, a transparent voltage off-state and the light scattering on-state. A driving voltage of the normal mode is almost the same as that of the reverse mode. A domain with the normal mode property is successfully fabricated in the reverse mode LC cell by two step UV exposures through a photomask with and without the curing voltage. Scattering and transparent patterns simultaneously turns to transparent and scattering states without electrode partitions.

Printed Polymer‐Stabilized Chiral Nematic Liquid Crystal Privacy Windows

“…Hysteresis in the transmission was therefore observed when increasing and decreasing the field in accordance with previous studies. [ 17–18 ]…”

“…Hysteresis in the transmission was therefore observed when increasing and decreasing the field in accordance with previous studies. [17][18] Figure 2d,e shows the rise (scattering to transparent) and fall (transparent to scattering) times for the printed PSCLC droplet, respectively. These results were obtained when the printed droplet was subjected to a square wave signal with a 1 kHz frequency and an electric field of 5 V μm −1 , which as shown in Figure 2a-c result in the printed droplet becoming transparent.…”

High-Contrast and Scattering-Type Transflective Liquid Crystal Displays Based on Polymer-Network Liquid Crystals

“…PNLCs can also be widely applied to various optical devices, such as light modulators, displays, and smart windows. [1][2][3][4][5][6][7][8][9][10][11]. PN-90 • twisted nematic LC (PN-90 • TNLC) cells have also extensively been studied [12][13][14][15][16][17].…”

Driving Voltage in Reverse Mode Cell Using Reactive Mesogen : Effect of UV Absorption of Liquid Crystal

“…The homogeneously aligned reverse mode cell using a photo reactive mesogen (RM) and LCs with positive dielectric constant anisotropy has been proposed by Hikmet [6,7]. We have also investigated reverse mode cells with different LC materials and orientations to reduce the driving voltage [8][9][10][11][12]. Those studies indicated that the polymer morphology control is key technology to reduce the voltage.…”