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Ultra-Violet-Two-Domain Twisted Nematic Structure and its Fabrication Methods to Prevent Reverse Twist and Image Sticking

IP.com Disclosure Number: IPCOM000118668D
Original Publication Date: 1997-May-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Lien, S-CA: AUTHOR

Abstract

Disclosed is a structure of Ultra-Violet (UV) type two-domain twisted nematic liquid crystal panel and its fabrication methods. The structure is shown in the Figure with the left-handed twist shown for illustration. (The left-handed chiral agent is added to the Liquid Crystal (LC) before it is filled to the panel.) The right-handed twist can also be used for this structure with proper modification of the alignment directions. The dashed lines represent the edges of a pixel electrode on the bottom substrate, and the solid lines represent the boundary of the electrode on the top substrate for the corresponding pixel. Notice that the common electrode on the top substrate for a Thin Film Transistor/Liquid Crystal Display (TFT/LCD) panel is a continuous Indium-Tin Oxide (ITO).

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Ultra-Violet-Two-Domain Twisted Nematic Structure and its Fabrication
Methods to Prevent Reverse Twist and Image Sticking

      Disclosed is a structure of Ultra-Violet (UV) type two-domain
twisted nematic liquid crystal panel and its fabrication methods.
The structure is shown in the Figure with the left-handed twist shown
for illustration.  (The left-handed chiral agent is added to the
Liquid Crystal (LC) before it is filled to the panel.)  The
right-handed twist  can also be used for this structure with proper
modification of the alignment directions.  The dashed lines represent
the edges of a pixel  electrode on the bottom substrate, and the
solid lines represent the boundary of the electrode on the top
substrate for the corresponding pixel.  Notice that the common
electrode on the top substrate for a Thin  Film Transistor/Liquid
Crystal Display (TFT/LCD) panel is a continuous  Indium-Tin Oxide
(ITO).  The dashed arrows represent the LC pretilt direction of the
bottom substrate.  The solid arrows represent the LC pretilt
direction of the top substrate.  The alignment configuration of this
structure can be achieved by rubbing first, followed by the
polarized light irradiation through a photo-mask.  In detail, the
entire substrate is rubbed first in the direction of the
single-headed arrow,  as shown in area I.  The rubbing process
creates a non-zero pretilt angle.  The substrate is then exposed to a
polarized light through a photo-mask, which covers area I but does
not cover area II of each pixel  for both bottom and top substrates.
The polarization direction of the  polarized light is perpendicular
to the rubbing direction.  The polarized  light produces a alignment
such that the LC pretilt direction in area II  is opposite to that
created by the rubbing process.  However, the LC pretilt direction
and pretilt a...