Title :
Two-domain twisted nematic and tilted homeotropic liquid crystal displays for active matrix applications
Author_Institution :
IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA
Abstract :
To overcome the viewing-angle dependence of TN (twisted nematic) cells, the author has investigated two-domain TN (TDTN) and two-domain tilted homeotropic (TDTH) cells with optical compensation for active matrix applications. The simulated and experimental results for TDTN show a large viewing zone of +or-40 degrees in the vertical and +or-60 degrees in the horizontal directions with excellent grayscale fidelity. TDTN has been fabricated using multiple rubbings and one masking operation. Simulated results for compensated single-domain TH and TDTH are also reported. TDTH cells have been fabricated using a total of four oblique evaporations and one mask. The width of the disclination line between the two domains of TDTN or TDTH cells is discussed.<>
Keywords :
liquid crystal displays; nematic liquid crystals; active matrix applications; disclination line; large viewing zone; masking operation; multiple rubbings; oblique evaporations; optical compensation; tilted homeotropic liquid crystal displays; twisted nematic LCD; two-domain LCD; viewing-angle dependence; Active matrix liquid crystal displays; Brightness; Computer displays; Flat panel displays; Gray-scale; Impurities; Liquid crystal displays; Manufacturing; Optical films; Thin film transistors;
Conference_Titel :
Display Research Conference, 1991., Conference Record of the 1991 International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-0213-3
DOI :
10.1109/DISPL.1991.167435
