Abstract
Bistable liquid crystal displays offer many benefits, including the ability to display high levels of image content using passive matrix addressing and without thin-film transistors; ultralow power reflective displays with image storage that only consume power with changes to image; and flexible plastic displays capable of showing color images. The topic is diverse, involving nematic, smectic, and cholesteric liquid crystals; retardation, anisotropic absorption, scattering, and selectively reflecting optical modes; dielectrically, ferroelectrically, and flexoelectrically driven electrooptic effects; bistable textures stabilized by monostable surfaces or smectic layers and bistable surfaces; and applications ranging from electronic skins to high-definition television. Many different bistable display modes have been suggested over the past four decades, and this chapter concentrates on the bistable twisted nematic, surface stabilized ferroelectric liquid crystals (FLCs), scattering smectic A, grating aligned zenithal bistable display, and bistable cholesteric displays (BCDs).
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Abbreviations
- BCD:
-
Bistable Cholesteric Display
- BiNemâ„¢:
-
Trade Name for 0-Ï€ Bistable Nematic Mode marketed by Nemoptic
- BTN:
-
Bistable Twisted Nematic often used for the 0-2Ï€ metastable nematic display mode
- C1 and C2:
-
FLC Chevron smectic layer orientation directions defined with respect to the parallel surface alignment directions
- CMOS:
-
Complementary Metal-Oxide Semiconductor/Silicon
- DMOS:
-
Double Diffused Metal-Oxide Semiconductor/Silicon
- DRAMA:
-
Defence Research Agency Multiplexed Addressing Scheme used for Ï„Vmin FLC
- ESL:
-
Electronic Shelf-Edge Label used in retail for automatically displaying pricing and other product information
- FLC:
-
Ferroelectric Liquid Crystal formed in chiral tilted smectic liquid crystals, but usually taken to mean chiral smectic C∗
- FLCD:
-
Ferroelectric Liquid Crystal Display
- HAN:
-
Hybrid-Aligned Nematic, usually taken to mean homeotropic alignment on one surface, and homogeneous or low pre-tilt alignment on the opposite surface
- HDTV:
-
High-Definition Television usually corresponding to 1,920 × 1,080i (interlaced) or 1,920 × 1,080p (progressive) pixels
- ITO:
-
Indium Tin Oxide, the transparent conducting oxide layer most commonly used by the display, touch screen, and solar panel industries
- LCD:
-
Liquid Crystal Display
- N and N∗ :
-
Nematic and Chiral Nematic Liquid Crystal Phases, where the pitch of the chiral nematic is arbitrarily taken to be much longer than the wavelength of light, to distinguish it from the cholesteric phase
- NTSC:
-
National Television System Committee that defined the standards for US color television
- OLED:
-
Organic Light Emitting Diode
- PEDOT:
-
Poly (3,4- ethylenedioxythioiphene), a polymeric transparent conductor
- PES:
-
Polyethersulfone polymer film that can be made without birefringence
- PET:
-
Polyethylene Terephthalate, polymer film
- Ps and Pf :
-
Electric Polarization, either spontaneous (ferroelectric) or elastically induced (flexoelectric)
- QVGA:
-
Quarter-Video-Graphics Array, 320 × 240 pixels
- RGBW:
-
Red-Green-Blue and transparent (White) color filter system
- RMS:
-
Root Mean Square
- SiOx :
-
Silicon Oxide Layer, usually evaporated onto glass surface to induce director alignment
- SmA, SmC, and SmC∗ :
-
Smectic A, Smectic C, and Chiral Smectic C Phases
- STN:
-
Supertwist Nematic Display, taken to include foil compensated STN
- TDP:
-
Triangular Director Profile for SmC and FLC chevron structures
- TFT:
-
Thin-Film Transistor, usually meaning one or more such elements at each pixel
- TN:
-
Twisted Nematic
- VAN:
-
Vertically Aligned Nematic, where both surfaces are homeotropically aligned
- ZBD:
-
Zenithal Bistable Display/Device
- Δn:
-
The birefringence of the anisotropic liquid crystal phases, given as the difference between extraordinary n e and ordinary n o refractive indices
- Ï„Vmin mode:
-
FLCD Mode of operation for low Ps and highly positive dielectrically biaxial FLC
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Further Reading
Chigrinov VG (1999) Liquid crystal devices. Artech House, London
Crawford G, Zumer S (eds) (1996) Liquid crystals in complex geometries formed by polymer and porous networks. Taylor and Francis, London
Demus D, Goodby J, Gray GW, Spiess H-W, Vill V (eds) (1998) Handbook of liquid crystals. Wiley VCH, Weinheim
Hilsum C (2010) Flat-panel electronic displays: a triumph of physics, chemistry and engineering. Philos Trans R Soc A Math Phys Eng Sci 368(1914):1027–1082
Lagerwall ST (1999) Ferroelectric and antiferroelectric liquid crystals. Wiley-VCH, Weinheim
Takatoh K, Sakamoto M, Hasegawa R, Koden M, Itoh N, Hasegawa M (2005) Alignment technologies and applications of liquid crystals. Taylor and Francis, London
Wu ST, Yang DK (2001) Reflective liquid crystal displays. Wiley, Chichester/New York
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Jones, C. (2012). Bistable Liquid Crystal Displays. In: Chen, J., Cranton, W., Fihn, M. (eds) Handbook of Visual Display Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79567-4_92
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