40.1: Invited Paper: Ultrafast High Optical Contrast Flexoelectric Displays for Video Frame Rates

We describe wide temperature range bimesogenic chiral nematic liquid crystals mixtures with high flexoelectro-optic coefficients (e/K), of the order of 2.0–4.0 CN−1 m−1, with 50–100μs response times. Gray scale devices in both the ULH texture, with an optimum optical in plane switch of 45° at fields of <2Vμm−1, and the USH mode, with a unique optically isotropic “field off” black state (∼0.7 nits) and contrast ratios of ∼5000:1, using “in plane” electric fields driving will be described. The new materials and devices give μs level to level switching and may be used in FSC video rate displays.

[1]  S. Lee,et al.  Fast linear electro‐optic effect based on cholesteric liquid crystals , 1989 .

[2]  Harry J. Coles,et al.  Liquid crystal based continuous phase retarder: from optically neutral to a quarter waveplate in 200 microseconds , 2005, SPIE OPTO.

[3]  P. Hands,et al.  Spontaneous induction of the uniform lying helix alignment in bimesogenic liquid crystals for the flexoelectro-optic effect , 2012 .

[4]  J. Willmott,et al.  The effect of the molecular structure on flexoelectric coupling in the chiral nematic phase , 2001 .

[5]  S. Lagerwall,et al.  Linear electro‐optic effect based on flexoelectricity in a cholesteric with sign change of dielectric anisotropy , 1994 .

[6]  S. Elston,et al.  Investigation into chiral active waveplates , 2006 .

[7]  H. Coles,et al.  A new series of chiral nematic bimesogens for the flexoelectro-optic effect , 1999 .

[8]  S. Lagerwall,et al.  The flexoelectro-optic effect in cholesterics , 1997 .

[9]  S. Lagerwall,et al.  Sign reversal of the linear electro‐optic effect in the chiral nematic phase , 1994 .

[10]  Harry J. Coles,et al.  Optimized flexoelectric response in a chiral liquid-crystal phase device , 2005 .

[11]  F. Castles,et al.  Flexoelectro-optic properties of chiral nematic liquid crystals in the uniform standing helix configuration. , 2009, Physical review. E, Statistical, nonlinear, and soft matter physics.

[12]  Su Seok Choi,et al.  Polymer stabilized chiral nematic liquid crystals for fast switching and high contrast electro-optic devices , 2011 .

[13]  Patel,et al.  Flexoelectric electro-optics of a cholesteric liquid crystal. , 1987, Physical review letters.

[14]  G. Hegde,et al.  Periodic anchoring condition for alignment of a short pitch cholesteric liquid crystal in uniform lying helix texture , 2010 .

[15]  Tsung-Hsien Lin,et al.  A stable and switchable uniform lying helix structure in cholesteric liquid crystals , 2011 .

[16]  H. Coles,et al.  THE FLEXOELECTRIC BEHAVIOUR OF A HYPERTWISTED CHIRAL NEMATIC LIQUID CRYSTAL , 2001 .

[17]  S. Elston,et al.  The influence of chirality on the difference in flexoelectric coefficients investigated in uniform lying helix, Grandjean and twisted nematic structures , 2009 .

[18]  H. Coles,et al.  ENHANCED FLEXOELECTRIC SWITCHING BEHAVIOUR IN THE CHIRAL NEMATIC PHASE , 2001 .

[19]  Andrew G. Glen,et al.  APPL , 2001 .

[20]  Per Rudquist,et al.  Volume-stabilized ULH structure for the flexoelectro-optic effect and the phase-shift effect in cholesterics , 1998 .

[21]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.