NOVEL TECHNIQUE FOR ACHIEVING DUAL-DOMAIN ALIGNMENT IN TWISTED NEMATIC LIQUID-CRYSTAL DISPLAY AND ITS APPLICATION

A simple technique for achieving dual-domain alignment in a twisted ne matic liquid crystal display (TN-L-CD) is proposed. By incorporating t he use of linearly polarized deep UV (DUV) for liquid crystal alignmen t, only one rubbing and one photolithographic process are added to con ventional TN fabrication. We fabricated dual-domain twisted nematic (D DTN) cells using this technique with a practical pixel resolution. Thi s DDTN cell has very symmetrical viewing characteristics in both the v ertical and horizontal viewing directions. With the use of the proper type of retardation films along with this DDTN we have been able to ac hieve a contrast ratio of 10:1, to almost +/-40 degrees in the vertica l and beyond +/-60 degrees in the horizontal viewing directions, witho ut any gray-scale inversion.