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Liquid Crystal Display Multi-Domain Fabrication Method with Wavy Alignment Surface

IP.com Disclosure Number: IPCOM000115922D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Ono, H: AUTHOR

Abstract

A structure and fabrication method for Twist Nematic (TN) Liquid Crystal Display (LCD) is described whose pixels are dimensionally divided into small and many sub-domains to enhance the vertical viewing angle. A conventional pixel with an alignment layer has single domain whose pretilt is homogeneous so that the viewing cone leans almost perpendicular to the liquid crystal direction. Then the vertical viewing angle is sacrificed to be narrow in typical LCD applications. There are several ideas to realize vertically symmetrical and wide viewing angle with multi-domain alignment layers. In the cases, the alignment layer is dimensionally flat but a pixel is divided into sub-domains whose pretilt angles or the directions are different from each other, usually complementary for symmetrical view angle.

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Liquid Crystal Display Multi-Domain Fabrication Method with Wavy
Alignment Surface

      A structure and fabrication method for Twist Nematic (TN)
Liquid Crystal Display (LCD) is described whose pixels are
dimensionally divided into small and many sub-domains to enhance the
vertical viewing angle.  A conventional pixel with an alignment layer
has single domain whose pretilt is homogeneous so that the viewing
cone leans almost perpendicular to the liquid crystal direction.
Then the vertical viewing angle is sacrificed to be narrow in typical
LCD applications.  There are several ideas to realize vertically
symmetrical and wide viewing angle with multi-domain alignment
layers.  In the cases, the alignment layer is dimensionally flat but
a pixel is divided into sub-domains whose pretilt angles or the
directions are different from each other, usually complementary for
symmetrical view angle.  Merits of the enhanced viewing angle by
those methods are well evaluated.  However, the fabrication processes
are chemical oriented which are apt to be instable, so that the
application has been limited concerning miscellaneous problems at
mass-production.

      The new method described here is also based on the multi-domain
idea, but the fabrication is by mechanical process established well.
Fig. 1 shows the cross section of the proposed LCD cell structure.
The over coat layer is not flat but has wavy surface.  This size of
wave can be fabricated by stamping (for instance, o...