Liquid Crystalline Polymer Stabilized FLCDs with Conventional Rubbed Polyimide Films or with Photo Alignment Films of Poly(vinyl Cinnamate)

Abstract

Polymer stabilized SSFLCDs have been successfully fabricated. A liquid crystalline polymer network in a device cell is formed by the photo-cure of UV photo-currable liquid crystalline monomers that are doped in an FLC, where both the rubbed polyimide (PI) and non-rubbed but linearly polarized UV irradiated poly(viny1 cinnamate) (PVCi) films are utilized as surface FLC molecular alignment. The actual monomers adopted is acrylate with a mesogenic side chain. The PVCi is one of the photo alignment polymer. The fabrication process of these SSFLC cells is as follows; first the photo-cure is done on a monomers and initiators doped LC medium at the temperature where this material takes SmA phase and then the cell is cooled down to room temperature, at which the medium takes SmC* phase. The layer structure of the liquid crystalline polymer stabilized (LC-PS) FLC cells has been investigated by X-ray diffraction measurement. As the experimental results, it is found that the formed polymer network suppresses the formation of a chevron layer structure, resulting in the formation of a quasibookshelf layer structure; the only C1-uniform state is spontaneously formed without giving a high surface pretilt angle; and a fairly good memory state with an excellent contrast ratio and a low threshold voltage are obtained for a low concentration of doped monomers (2 -3 wt?h) in particular with photo-alignment layers of PVCi; and furthermore, in a cell with a higher concentration of doped monomers (4 wt%) an excellent electroclinic like behavior (called the quasi-electroclinic effect) is obtained.

In-Plane Retardation Switching Behavior at Certain Types of Smectic Liquid Crystals

“…Using the same smectic liquid crystal mixture shown in Figure 5, polymer assisted ferroelectric liquid crystal response phenomenon was investigated how the bookshelf layer structured small spontaneous polarization liquid crystal molecules show any specific electro-optic response, specifically its retardation switching behavior using polymer assisted ferroelectric liquid crystal configuration [54][55][56]. The detail of this empirical result is published [57].…”

Polymer-stabilized ferroelectric liquid crystal for flexible displays

“…A mono-functional acrylic monomer [3,10] (UCL-001 from DIC, Fig. 3), which can be polymerized by ultraviolet (UV) light irradiation, was mixed with FLC (CS-1030 from Chisso) and the nematic-phase solution was then coated onto the alignment layer.…”

Ferroelectric liquid crystals: Excellent tool for modern displays and photonics

“…Thus, with these features and advantages, the DHFLC has potential to find application in many modern electro‐optical devices based on the amplitude modulation. In the next section, we will discuss about another important electro‐optical mode …”