P-81: In-Situ Spectroscopy of Holographically formed Polymer Dispersed Liquid Crystal Materials for High Performance Reflective Display Applications

2001 ◽  
Vol 32 (1) ◽  
pp. 866 ◽  
Author(s):  
Garfield T. Warren ◽  
Mousumi DeSarkar ◽  
Jun Qi ◽  
Gregory P. Crawford
Keyword(s):  
Liquid Crystal ◽  
High Performance ◽  
In Situ Spectroscopy ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Reflective Display ◽  
Liquid Crystal Materials

scholarly journals Accurate, Efficient and Rigorous Numerical Analysis of 3D H-PDLC Gratings

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3725
Author(s):  
Jorge Francés ◽  
Sergio Bleda ◽  
Daniel Puerto ◽  
Sergi Gallego ◽  
Andrés Márquez ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
High Performance ◽  
Fdtd Method ◽  
Polymer Dispersed Liquid Crystal ◽  
Optical Media ◽  
Polymer Dispersed ◽  
3D Numerical Modelling ◽  
Anchoring Strength ◽  
Split Field

This work presents recent results derived from the rigorous modelling of holographic polymer-dispersed liquid crystal (H-PDLC) gratings. More precisely, the diffractive properties of transmission gratings are the focus of this research. This work extends previous analysis performed by the authors but includes new features and approaches. More precisely, full 3D numerical modelling was carried out in all analyses. Each H-PDLC sample was generated randomly by a set of ellipsoid geometry-based LC droplets. The liquid crystal (LC) director inside each droplet was computed by the minimisation of the Frank elastic free energy as a function of the applied electric field. The analysis carried out considered the effects of Frank elastic constants K11, K22 and K33; the anchoring strength W0; and even the saddle-splay constant K24. The external electric field induced an orientation of the LC director, modifying the optical anisotropy of the optical media. This effect was analysed using the 3D split-field finite-difference time-domain (SF-FDTD) method. In order to reduce the computational costs due to a full 3D tensorial analysis, a highly optimised method for high-performance computing solutions (HPC) was developed. The influences of the anchoring and voltage on the diffraction efficiencies were investigated, showing the potential of this approach.

Electro‐optical properties of polymer dispersed liquid crystal materials

1996 ◽  
Vol 80 (4) ◽  
pp. 1991-1995 ◽  
Author(s):  
Si‐Xue Cheng ◽  
Ru‐Ke Bai ◽  
Ying‐Fang Zou ◽  
Cai‐Yuan Pan
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Liquid Crystal Materials

Conformable displays based on polymer-dispersed liquid-crystal materials on flexible substrates

2003 ◽  
Vol 11 (2) ◽  
pp. 289 ◽  
Author(s):  
D. R. Cairns ◽  
S. P. Gorkhali ◽  
S. Esmailzadeh ◽  
J. Vedrine ◽  
G. P. Crawford
Keyword(s):  
Liquid Crystal ◽  
Flexible Substrates ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Liquid Crystal Materials

In Situ Diffusion and Miscibility Studies of Thermoplastic PDLC Systems by FT-IR Microspectroscopy

1997 ◽  
Vol 51 (3) ◽  
pp. 297-303 ◽  
Author(s):  
Sudarsana R. Challa ◽  
Shi-Qing Wang ◽  
Jack L. Koenig
Keyword(s):  
Liquid Crystal ◽  
Phase Diagrams ◽  
Butyl Methacrylate ◽  
Contact Method ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Ir Microspectroscopy ◽  
In Situ Diffusion ◽  
Miscibility Studies

Infrared microspectroscopy was used to study the interaction of liquid crystal (E7) with poly( n-butyl methacrylate) (PBMA). A novel experimental technique is introduced to conduct in situ diffusion and miscibility studies of polymer-dispersed liquid crystal (PDLC) systems. The amount of liquid crystal dissolved in the polymer matrix is determined by using the IR microspectroscope, which is a powerful tool for characterizing domains on the order of tens of micrometers. Quantitative phase diagrams are constructed for the PBMA and E7 mixture. It is observed that the diffusion of E7 into PBMA follows Fick's second law of diffusion with a diffusion coefficient of (1.3 ± 0.2) × 10−7 cm2/s at 61 °C. The intensities of the peaks in the IR spectrum were used as a measure of the concentration of the components. The combination of IR microspectroscopy with the contact method is proven to be a powerful technique for the quantitative elucidation of phase diagrams.

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