Control of Liquid Crystal Alignment Using Stamped-Morphology Method

Abstract

The analytical solution of the Schrodinger equation is presented in the case m = 0 for the angular equation of the dipolar potential.

Microcutting Materials on Polymer Substrates

“…This finding may have implications for (bistable [23] ) LC display technology: multi-domain pixelation (i.e., combining differently oriented LC domains in each pixel) leading to improved viewing-angle characteristics of displays [24] might easily be achieved through microcutting. Furthermore, with our simple method, fabrication seems feasible of patterned electrode/ªanchoringº surfaces which, for example, can control the tilt-angle of LCs with respect to the surface, [25,26] induce radial or azimuthal arrangement thereof, [27] or produce chirped LC gratings. [28] Also, microcutting of multilayers, in particular of polymer/polymer systems, should also permit the fabrication of curved alignment/electrode components [29] that generally are difficult to produce with other processes.…”

Surface free energy and pretilt angle on rubbed polyimide surfaces

“…For optimal electrooptic performance of LCD, it is essential to obtain a uniform alignment of the liquid crystal (LC) molecules. Various technologies for LC alignment, such as oblique evaporating, 1 rubbing, 2,3 and nonrubbing methods, 4 have been reported for many years. Rubbing is widely used in LCD production because of its high productivity.…”

“…Although many theoretical and experimental studies on LC alignment have been performed, the actual alignment mechanism on the rubbed films is still not fully understood. [1][2][3][4] A few publications indicate that the molecular orientation and surface polarity of a polymer surface plays a key role in the alignment of LC molecules at the surface. [5][6][7] To study the surface properties and pretilt angle on rubbed polyimides, first of all, we chose a main-chain-type and two side-chain-type polyimides and investigated the contact angles of distilled water and methylene iodide on the rubbed polyimide surfaces as a function of rubbing strengths.…”

The Directional Peeling Effect of Nanostructured Rigiflex Molds on Liquid‐Crystal Devices: Liquid‐Crystal Alignment and Optical Properties

“…The method to increase the pretilt angle for the surface patterning process for LC alignment is divided into two aspects, the groove-shape design [21,40] and the formation of physically or chemically inhomogeneous textures. [17,41,42] However, because the groove-shape design and physically inhomogeneous texture are difficult to apply to nanometer-scale structures with better optical performance and it is difficult to know the exact LC transition direction, the chemically inhomogeneous texture is the appropriate method to increase the pretilt angle and ensure a fixed LC direction and good optical properties.…”

“…In addition, a surface pattern with large spacing (larger than the wavelength of incident light) suffers from weak optical properties because the surface pattern induces light loss because of the low-order-parameter LC alignment and the generation of diffraction by the surface grating. Although there are some studies that aim to solve one of these problems, [20][21][22][23] they unwittingly control the preferential LC rising-up direction or still suffer from the problems related to the optical properties. Therefore, the method to simultaneously and deliberately solve several problems in the patterning method for LC alignment is necessary.…”