ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,227,688, issued on Feb. 18, was assigned to Merck Patent GmbH (Darmstadt, Germany).

"Dye-doped liquid-crystal medium comprising polymerizable compounds" was invented by Hyun-Woo Bae (Pyeongtaek, South Korea), Jung-Min Lee (Pyeongtaek, South Korea), Hyun-Jin Yoon (Pyeongtaek, South Korea) and Yong-Kuk Yun (Darmstadt, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid-crystal (LC) medium containing one or more dyes and one or more polymerizable compounds, its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in colour LC displays of the PSA (polymer sustained alignment) or SA (self-aligning) mo...