13 August 1993 Phase diffraction utilizing a liquid crystal diffraction device
Author Affiliations +
Abstract
In supertwisted nematic (STN) display technology, a chiral compound is added to a nematic liquid crystal in order to induce a twisting helix. This helix is then bound into some angular configuration by surface anchoring energies on the plate of the LCD. Due to this confinement of the helix, deformations occur in its structure when a voltage is applied. One of the most interesting deformations which can occur is the striped domain instability. By constructing a cell such that the cholesteric-nematic threshold voltage (Vth) is higher than the domain formation voltage (Vc) we can induce 3 dimensional periodic deformations in the molecular orientation of the liquid crystalline material before the helical geometry of the cell is destroyed. We have constructed several types of Liquid Crystal Diffraction Devices (LCDD) based on this principle. Here we describe the theory of operation, device construction, and performance of such switchable LCDDs.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Drew C. Fair, Drew C. Fair, Mary Tilton, Mary Tilton, Chad Hoke, Chad Hoke, } "Phase diffraction utilizing a liquid crystal diffraction device", Proc. SPIE 1911, Liquid Crystal Materials, Devices, and Applications II, (13 August 1993); doi: 10.1117/12.151219; https://doi.org/10.1117/12.151219
PROCEEDINGS
7 PAGES


SHARE
RELATED CONTENT

High-resolution diffraction gratings
Proceedings of SPIE (March 10 1996)
Optical nonlinearity in chiral nematics for light modulation
Proceedings of SPIE (October 13 1998)
Photonic bandgaps controllable blue phase liquid crystal
Proceedings of SPIE (February 02 2011)
Optical efficiency of light valve projectors
Proceedings of SPIE (March 28 1996)

Back to Top