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Sealing Method for Liquid Crystal Panel

IP.com Disclosure Number: IPCOM000121873D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 3 page(s) / 75K

Publishing Venue

IBM

Related People

Suzuki, S: AUTHOR [+2]

Abstract

Disclosed herein is sealing method for a liquid crystal (LC) panel wherein multi-sealing is used for an LC insertion hole. The multi- sealing is comprised of an inner sealing and an outer sealing. The material of the inner sealing is selected so as to achieve less degradation of LC and enhance an easy permeation into the LC insertion hole. The material of the outer sealing is selected so as to protect the enclosed LC from a clean process after the LC sealing process and achieve a strong adhesion with glass substrates. According to this method, the reliability for an LC panel which has high resistivity LC around the inserting hole is enchanced and glass tear-off is eliminated. Conventional Method

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Sealing Method for Liquid Crystal Panel

      Disclosed herein is sealing method for a liquid crystal
(LC) panel wherein multi-sealing is used for an LC insertion hole.
The multi- sealing is comprised of an inner sealing and an outer
sealing.  The material of the inner sealing is selected so as to
achieve less degradation of LC and enhance an easy permeation into
the LC insertion hole.  The material of the outer sealing is selected
so as to protect the enclosed LC from a clean process after the LC
sealing process and achieve a strong adhesion with glass substrates.
According to this method, the reliability for an LC panel which has
high resistivity LC around the inserting hole is enchanced and glass
tear-off is eliminated.
Conventional Method

      A liquid crystal panel has an insertion hole through which LC
is injected into an LC panel or an LC cell.  The hole is usually shut
by UV (ultraviolet) light-cured epoxy resin after an LC injection
process (final sealing).  The final sealing is processed as follows:
(1)  LC insertion.
(2)  Excess LC pushing out of the panel by pressing the panel.
(3)  Dispensing the UV-cured resin.
(4)  UV light radiation and UV resin cure.
(5)  Cleaning and taking off LC from the panel surface using organic
solvent.
      This conventional method has problems as follows:
(1)  Fast UV resin permeation into the display area results in the
degradation of LC resistivity and display quality.
(2)  Imperfect inserting-hole shut...