A METHOD OF MANUFACTURE OF TWISTED NEMATIC FIELD EFFECT LIQUID CRYSTAL ANALOGUE DISPLAY

摘要

A method of manufacturing the Twisted Nematic Field Effect Liquid Crystal Analogue Display comprising:(a) the steps of screen printing with a known acid resistant paste in a columnar geometry on a transparent conductive coating on a bottom glass substrate(b) screen printing with the same acid resist paste in a rectangular geometry on a transparent conductive coating on a top glass substrate.(c) Drying the printed surface and subsequently etching the same for 60 second with a mixture of equal volumes of hydrochloric acid (conc. 37%) and deionised water rand % nitric acid by volume, the mixture is maintained at 55 Degree Celsius during etching.(d) Rinsing, drying and removing the acid resist material by treating with trichloroethylene followed by drying, thus exposing the desired pattern of indium-tin oxide on the substrate(e) Screen printing the bottom substrate with glass frit followed by drying and prefusing,(f) Surface treating the substrates by vacuum evaporation such that the direction of treatment is parallel to the longer side of bottom substrate and parallel to the shorter side of top substrate.(g) Brush-forming two conductive dots an the terminal ends of bottom substrate and drying followed by assembling and sealing of two plates in a sealing furnace present at correct sealing temperature profile,(h) Edge metallisine the selected cell filing the cell with liquid crystal and soldering the metallised edge.(i) Pasting two Polaroid sheets on the outer surface of both the substrates such that the polarids are crossed leaving the cell clear when viewed through the polaroids.