Browse Prior Art Database

Fabrication Method of Liquid Crystal Panel (LC Alignment Monitoring)

IP.com Disclosure Number: IPCOM000105853D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Kamiya, H: AUTHOR [+2]

Abstract

Disclosed herein is a liquid crystal (LC) molecule alignment monitoring method of a liquid crystal panel wherein the voltage-applied dummy cell, which is composed of LC materials including spacers sandwiched with two rubbed glasses, is observed to check the LC alignment under realistic LC driving conditions. This monitoring method is very useful to check the alignment defect before mass fabrication of LC alignment layers. The sandwiched cell is pressed to acquire a narrower cell thickness around 5 micron meters, and electrically driven to detect rubbing defects such as rubbing stripe or alignment error.

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Fabrication Method of Liquid Crystal Panel (LC Alignment Monitoring)

      Disclosed herein is a liquid crystal (LC) molecule alignment
monitoring method of a liquid crystal panel wherein the
voltage-applied dummy cell, which is composed of LC materials
including spacers sandwiched with two rubbed glasses, is observed to
check the LC alignment under realistic LC driving conditions.  This
monitoring method is very useful to check the alignment defect before
mass fabrication of LC alignment layers.  The sandwiched cell is
pressed to acquire a narrower cell thickness around 5 micron meters,
and electrically driven to detect rubbing defects such as rubbing
stripe or alignment error.

      In the conventional method, the dummy cell is checked without
electrical field and cell thickness.  That is far from real panel
configuration because of no pressure application to the cell.

      The method comprises the following steps:

1.  One rubbed glass is set on the backlight with polarizer.
2.  A few drops of LC material is put on the glass.
3.  The other glass is set on to the former glass with the analyzer.
4.  The cell is observed visually.

      This method can only check the static state of LC alignment,
and may miss the rubbing defect detection and dynamic LC alignment,
such as reverse tilt domain appearance.

      The figure shows the disclosed LC molecule alignment monitoring
system.  The system is composed of two rubbed glasses 1, whose
rubbing d...