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Surrounding Seal Optimization for Cell Gap and Dispense

IP.com Disclosure Number: IPCOM000123913D
Original Publication Date: 1999-Jul-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Suzuki, S: AUTHOR

Abstract

Disclosed herein is a surrounding seal optimization method for cell gap control and elimination of seal dispense failure, where seal material includes rod spacer (glass fiber) and sphere spacer (silicon-oxide: SiO ball) with optimized diameter and mixing ratio. Dispense failure mode such as; neck down or void of seal, seal bunged up at dispense nozzle (or syringe), are easily occurred when narrower seal with only glass fiber blend is used. In order to dispense less seal volume (narrower width), minimization of nozzle diameter is inevitable. In this case seal blocking through smaller nozzle diameter or nozzle damage by glass fiber contact is apt to occur.

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Surrounding Seal Optimization for Cell Gap and Dispense

   Disclosed herein is a surrounding seal optimization method
for cell gap control and elimination of seal dispense failure, where
seal material includes rod spacer (glass fiber) and sphere spacer
(silicon-oxide: SiO ball) with optimized diameter and mixing ratio.
Dispense failure mode such as; neck down or void of seal, seal bunged
up at dispense nozzle (or syringe), are easily occurred when narrower
seal with only glass fiber blend is used.  In order to dispense less
seal volume (narrower width), minimization of nozzle diameter is
inevitable.  In this case seal blocking through smaller nozzle
diameter or nozzle damage by glass fiber contact is apt to occur.  To
avoid this dispense failure with and to hold cell gap uniformity,
sphere spacer (SiO ball) and glass fiber (rod shape) are mixed into
seal material with diameter and mixing ratio optimization.

   Figure shows plane view of dispensed surrounding seal and
cross sectional view of LC (liquid crystal) panel.  Surrounding seal
mixed with sphere spacer (SiO) and rod spacer (glass fiber) is
applied through dispenser nozzle.  Cell gap control of LC panel is
one of the key factor to define optical property.  Density and
distribution uniformity of plastic ball spacer scattered on pixel
area, surrounding seal cure condition (temperature and applied
pressure), and spacer material in seal are very important to acquire
uniform cell gap.  Usually glass fiber is mixed with seal material to
avoid seal smash (squash) and to control cell gap.  However rod
s...