PLASMA-SPRAYED BaSO4 REFLECTOR FOR TWISTED NEMATIC DISPLAYS
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18
A layer of barium sulfate may be used as the reflector layer in a twisted nematic liquid crystal display cell to improve brightness. Commercially available twisted nematic (TN) cells have a structured anisotropic reflector which enhances reflection in both the forward (12 o'clock) and backward (6 o'clock) directions. The reflector is made by evaporating Al on a stretched MYLAR* film drawn through two rollers at an elevated temperature. By using plasma-spray technology, BaSO4 powder can be directly sprayed on the back side of the second polarizer of TN cells in place of the Al MYLAR reflector. A thin layer of plastic material, such as sprayed acrylic film, then may be applied onto the BaSO4 layer as protection.