US 12,291,663 B2
Matrix formulation for polymer dispersed liquid crystal displays in low power direct current (DC) electromagnetic field application
Caitlyn C. Cook, Livermore, CA (US); and Elaine Lee, Brooklyn, NY (US)
Assigned to Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed by Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed on Nov. 22, 2019, as Appl. No. 16/692,567.
Claims priority of provisional application 62/771,948, filed on Nov. 27, 2018.
Prior Publication US 2020/0165520 A1, May 28, 2020
Int. Cl. C09K 19/54 (2006.01); C08F 220/14 (2006.01); G02F 1/133 (2006.01); G02F 1/1334 (2006.01)
CPC C09K 19/544 (2013.01) [C08F 220/14 (2013.01); G02F 1/13306 (2013.01); G02F 1/1334 (2013.01); C09K 2019/546 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A product, comprising:
a polymer dispersed liquid crystal (PDLC) display formulation comprising a polymer matrix having a plurality of liquid crystal (LC) domains dispersed therein,
wherein the polymer matrix comprises a polymerized product of a monofunctional monomer, a trifunctional oligomer, and a trifunctional monomer;
a pair of electrodes having the PDLC display formulation positioned therebetween; and
a direct current electromagnetic field power circuit coupled to the pair of electrodes,
wherein the power circuit is configured to cause formation of a direct current electromagnetic field, the direct current electromagnetic field being at least 2.5 μW,
wherein the PDLC display formulation is opaque in the absence of application of a low power direct current electromagnetic field between the electrodes, and
wherein the PDLC display formulation is characterized as having a substantially constant optical transparency during application of the low power direct current electromagnetic field between the electrodes for a predefined duration of time.