Oxygen Impermeable Liquid Crystal Cells
Original Publication Date: 1988-Aug-01
Included in the Prior Art Database: 2005-Feb-15
Liquid crystal polymers are proposed for use as peripheral spacers or to form an oxygen impermeable layer adjacent to the peripheral seals to prevent the oxygen from penetrating into the liquid crystal cells for display and light-valve applications. Most of the present-day guest-host (GH) liquid crystal (LC) displays uses anthraquinone dichroic dyes as the guest because of its better photo-chemical stability as compared to other dichroic dyes, such as azo-dyes. However, in the presence of oxygen, the photo- stability of anthraquinone dyes degrades because UV or visible light tends to accelerate the chemical interaction between the anthraquinone dyes and the oxygen, resulting in decreases of the optical density and the resistivity of the GH LC system.