Browse Prior Art Database

Structure of Spacer Post for Liquid Crystal Display

IP.com Disclosure Number: IPCOM000117727D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Nakagawa, Y: AUTHOR [+2]

Abstract

Disclosed is the structure of spacer post formed by semi-conductor technology, Oxide film deposited by Chemical Vapor Deposition, Chemical Mechanical Polish and Dry Etching. This spacer post keeps uniformity of cell gap all over the Liquid Crystal Display (LCD) and eliminates the mechanical damage to the layers underneath the spacer post, which is produced when the top glass is pressed to the spacer posts which are distributed all over the device.

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This is the abbreviated version, containing approximately 86% of the total text.

Structure of Spacer Post for Liquid Crystal Display

      Disclosed is the structure of spacer post formed by
semi-conductor technology, Oxide film deposited by Chemical Vapor
Deposition, Chemical Mechanical Polish and Dry Etching.  This spacer
post keeps uniformity of cell gap all over the Liquid Crystal Display
(LCD) and eliminates the mechanical damage to the layers underneath
the spacer post, which is produced when the top glass is pressed to
the spacer posts which are distributed all over the device.

      The Figure shows the plane and cross-sectional view of the
device.  Glue is applied on the edges of four sides to keep the
liquid crystal inside with top glass.  The application of glue
results in the residence of its glue on the top surface of the spacer
post.

      When the top glass is placed applying pressure, the glue should
be removed away to form the top surface of the spacer post keeping a
uniformity of the cell gap.  The smaller top area of the spacer post
effectively removes the glue away during top glass placement.  High
pressure is required to make a uniform cell gap.  This high pressure
causes mechanical damages to the layers underneath the spacer post.
Larger bottom area of spacer post is preferable to relax the pressure
during top glass placement and to avoid the damage to the underlayer.

      The disclosed spacer post is comprised of two portions, one of
which is a base portion and the other a post portion which is formed
on...