Flexible ferroelectric liquid‐crystal devices containing fine polymer fibers

Fujikake, Hideo; Murashige, Takeshi; Sato, Hiroto; Iino, Yoshiki; Kawakita, Masahiro; Kikuchi, Hiroshi

doi:10.1889/1.1827850

Cited by 16 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to the bistable SSFLC, many FLC modes with gray-scale capability were developed based on the analog change of the optical axis. [2][3][4][5][6][7][8] Among them, the half-V-mode FLC 7,8 (HV-FLC) with a N*-SmC* phase sequence, which exhibits intrinsic continuous gray scales, is more suitable for active-matrix thin-film-transistor (AMTFT) driving. The major drawback, which remains unsolved in HV-FLC devices, is the horizontal chevron alignment defect.…”

Section: Introductionmentioning

confidence: 99%

Defect‐free half‐V‐mode ferroelectric liquid‐crystal device

Lin

Chen

2010

J Soc Info Display

View full text Add to dashboard Cite

Abstract— The horizontal chevron defect found in a half‐V‐mode ferroelectric‐liquid‐crystal (HV‐FLC) device can be suppressed by lowering the FLC's total free energy. The energy levels between spontaneous polarization (PS) up and down domains were degenerated by asymmetrical‐alignment treatments. The difference in the polar surface coefficient (γ2) was the key to suppressing the alignment defect. Alignment layers with opposite surface polarities and different anchoring energies were applied to control the sign and value of γ2. The asymmetric cells of PIrub ‐ PIplasma (rubbed polyimide and plasma‐treated polyimide surfaces), PVArub ‐ PIplasma (rubbed polyvinyl alcohol and plasma‐treated polyimide surfaces), and PVArub ‐ PIplasma (both rubbed PI and PVA) alignment conditions presented defect‐free alignment textures under a slow‐cooling process. Among these different alignment treatments, the PVArub ‐ PIrub treated cell demonstrated the best alignment result, benefited by the largest difference in polar surface coefficient.

show abstract

Section: Introductionmentioning

confidence: 99%

Defect‐free half‐V‐mode ferroelectric liquid‐crystal device

Lin

Chen

2010

J Soc Info Display

View full text Add to dashboard Cite

show abstract

“…The high driving voltage, alignment defect, and lacking of continuous gray scales limit FLCs' application for high resolution displays. In order to overcome the gray scales capability, many FLC modes were developed base on the analogue modulation of their optical axis [2][3][4][5][6][7][8]. Among these attempts, the half-V mode FLC (HV-FLC), possessing N*-SmC* phase sequence, provides the intrinsic continuous gray scales which is suitable for the driving using active matrix thinfilm-transistor (AM TFT) as backplane [7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Alignment textures of (a) R3206-50 in PI-PVA cell; and R2301 in (b) PI-PVA cell, (c) HMDS-PI asymmetric cell, and (d) Nylon 6-PI asymmetric cell.The surface polarity,2 γ , is able to be altered by different alignment techniques. By controlling the surface polarity and polar anchoring energy,…”

mentioning

confidence: 99%

Well aligned half-V ferroelectric liquid crystal in asymmetrical surface polarity controlled alignment cells

Chen

Lin

2010

SPIE Proceedings

View full text Add to dashboard Cite

Ferroelectric liquid crystals (FLCs) were known to possess fast response time under 1 ms. The low contrast ratio yielding from defect alignment, however, limited their display application. Based on FLC elastic free energy, the asymmetrical surface polarity controlled alignment was able to suppress the horizontal chevron defects in a half Vshaped switching FLC cell. It is due to the FLC's spontaneous polarization (Ps) pointed to one direction inducing by the opposite surface polarity in asymmetrical hybrid cell. The experimental approach of different alignment materials and different strengths of surface anchoring energies were evaluated in this study. The highest contrast ratio of 780:1 at saturation voltage under 5 V was obtained. The asymmetrical surface polarity controlled alignment technique provided a promising FLC well alignment and fast switching result for TFT-LCD application.

show abstract

“…We have recently carried out a study [7] that clarified how high-speed grayscale display capability and the mechanical stabilization required for a flexible display can be achieved by dispersing a fine polymer structure in FLC between flexible plastic substrates. In this article, the device structure, the fabrication technique and the basic display characteristics of a flexible FLC device are described.…”

Section: Introductionmentioning

confidence: 99%

“…It features a composite[7] of polymer fibers and FLC sandwiched between two plastic substrates, onto which transparent electrodes (ITO; In 2 O 3 : Sn) have been coated. A fine network of aligned polymer fibers[8] that runs throughout the FLC adhesively bonds the two thin flexible plastic film substrates.…”

mentioning

confidence: 99%