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High Accuracy Measurement Method of Cell Alignment Error in Liquid Crystal Display Panel

IP.com Disclosure Number: IPCOM000118095D
Original Publication Date: 1996-Sep-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Fujii, Y: AUTHOR [+2]

Abstract

Disclosed is a device for a method in the Liquid Crystal Display (LCD) panel to find the cell alignment error between the Array glass and the Color Filter glass. The origin of the vernier, which makes it possible to measure the alignment error, is located in line with the edge of the pixel area.

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High Accuracy Measurement Method of Cell Alignment Error in Liquid
Crystal Display Panel

      Disclosed is a device for a method in the Liquid Crystal
Display (LCD) panel to find the cell alignment error between the
Array glass and the Color Filter glass.  The origin of the vernier,
which makes it possible to measure the alignment error, is located in
line with the edge of the pixel area.

      The Figure shows an example of this method.  Vernia is made by
both the Array glass and the Color Filter glass.  The hatched area in
the Filter glass and the other area are on the Array glass.  The
alignment error can be known by finding the coincident bar as same
Vernia1 which  measures the X direction alignment error of the
left-upper pixel and Vernia2 which measures the Y direction of it are
located so that the origins of them are in line with the edge of the
pixel in each direction.

      Other vernias are located in the same way.  To know these
alignment errors in the Liquid Crystal Display panel is important to
design the shape of the Black Matrix which determines the aperture
ratio of the pixel.

      This vernia can be applied not only to a Thin Film Transistor
(TFT) or Standard (STN) LCD panel, but also to the devices using two
glasses.