Browse Prior Art Database

Manufacturing Technique of the Liquid Crystal Display Panel

IP.com Disclosure Number: IPCOM000116346D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Tajima, K: AUTHOR [+2]

Abstract

Disclosed is a manufacturing technique to make up for a defect that occurs by Ultra Violet - Two Domain Twisted Nematic (UV-TDTN) method, which is one of the wide viewing angle techniques of Liquid Crystal Display (LCD) panel. In order to change pretilt angle of alignment layer, UV-TDTN method apples UV rays to one side alignment layer. But it changes the layer's nature and often charges electricity in the LCD panel. As a result, some defaults such as image sticking and an after image occur in the LCD panel. This technique applies different amount of UV rays to both side of each facing alignment layers so that these pretilt angles differ while these electrical natures equal.

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Manufacturing Technique of the Liquid Crystal Display Panel

      Disclosed is a manufacturing technique to make up for a defect
that occurs by Ultra Violet - Two Domain Twisted Nematic (UV-TDTN)
method, which is one of the wide viewing angle techniques of Liquid
Crystal Display (LCD) panel.  In order to change pretilt angle of
alignment layer, UV-TDTN method apples UV rays to one side alignment
layer.  But it changes the layer's nature and often charges
electricity in the LCD panel.  As a result, some defaults such as
image sticking and an after image occur in the LCD panel.  This
technique applies different amount of UV rays to both side of each
facing alignment layers so that these pretilt angles differ while
these electrical natures equal.

      Fig. 1 shows a cross-section of a pixel of one side substrate
of the LCD panel.  In the Figure, an alignment layer 2 is formed on a
glass substrate 1.  The alignment layer 2 is divided into two areas A
and B.  Firstly, X's amount of UV rays is applied to the areas A and
B. Next (Fig. 2) Y's amount of UV rays is applied to the area B with
using an aligner mask 7 which does not pass through UV rays on the
area A.  Then, the alignment treatment (rubbing) process is done to
the alignment layer 2, so pretilt angles of the areas A and B become
a and b (b<a), respectively (Fig. 3).

      At last (Fig. 4) it piles up two substrates as that one side's
area A and the other side's area B face each other.  For it is
d...