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In-Plane Switching Liquid Crystal Display (Pre-Tilt Control Method)

IP.com Disclosure Number: IPCOM000119120D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Suzuki, S: AUTHOR

Abstract

Disclosed is a Liquid Crystal Display (LCD) of an in-plane switching mode, which is fabricated using the pre-tilt control method by a deep-Ultra Violet (UV) light irradiation (*). The pre-tilt angle of a UV irradiated area decreases when UV dosage increases as in the case of a usual polyimide alignment layer. The alignment layer (pre-tilt angle of 3-10 degrees) near electrode pattern or line pattern is masked when deep-UV is irradiated, which means the rubbing shadow has a higher pre-tilt angle, and the electrode space has a lower pre-tilt angle - less than one degree. The higher pre-tilt can prevent appearance of disclination line or Liquid Crystal (LC) alignment disorder, so the masked area with pre-tilt angle of 3-10 degree shows good LC alignment performance.

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In-Plane Switching Liquid Crystal Display (Pre-Tilt Control Method)

      Disclosed is a Liquid Crystal Display (LCD) of an in-plane
switching mode, which is fabricated using the pre-tilt control method
by a deep-Ultra Violet (UV) light irradiation (*).  The pre-tilt
angle of a UV irradiated area decreases when UV dosage increases as
in the case of a usual polyimide alignment layer.  The alignment
layer (pre-tilt angle of 3-10 degrees) near electrode pattern or line
pattern is masked when deep-UV is irradiated, which means the rubbing
shadow has a higher pre-tilt angle, and the electrode space has a
lower pre-tilt angle - less than one degree.  The higher pre-tilt can
prevent appearance of disclination line or Liquid Crystal (LC)
alignment disorder, so the masked area with pre-tilt angle of 3-10
degree shows good LC alignment performance.  The lower pre-tilt angle
of LC alignment  has a better viewing angle cone in in-plane
switching mode.

      On the LC alignment process of in-plane switching mode LCD, UV
(deep UV) light irradiation can make a lower pre-tilt angle (lower
than one degree) between pixel electrode and common electrode.  The
lower pre-tilt angle improves viewing cone characteristics in
in-plane switching.  The pre-tilt angle is unchanged by only UV light
masking, so  the higher pre-tilt area is easily created to prevent
disclination line  or LC alignment disorder.  In-plane switching
design has the comb-shaped  electrode with a large area of rubbing
shadow, so the higher pre-tilt angle of elec...