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Browse Prior Art Database

Connections for Data Line Repair

IP.com Disclosure Number: IPCOM000118680D
Original Publication Date: 1997-May-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Kodate, M: AUTHOR [+2]

Abstract

Disclosed is a bus connection method using bipolar data driver outputs for use in the repair of open data lines in Thin Film Transistor Liquid Crystal Displays (TFT/LCDs). This connection arrangement eliminates the visual artifact exhibited by repaired lines when the display panel is driven in column or dot inversion.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Connections for Data Line Repair

      Disclosed is a bus connection method using bipolar data driver
outputs for use in the repair of open data lines in Thin Film
Transistor Liquid Crystal Displays (TFT/LCDs).  This connection
arrangement eliminates the visual artifact exhibited by repaired
lines when the display panel is driven in column or dot inversion.

      The feature of this method is that the repaired line segments
are connected to the same voltage polarity outputs as the opposite
side of the broken line under any AC driving conditions, including
column or dot (pixel) inversion driving.  When a display panel with
dual-bank unipolar data drivers is repaired, the repaired line
segments are brighter than the surrounding lines.  The shift in
brightness is a consequence of vertical crosstalk in the array, due
to capacitive coupling between a pixel and the adjacent data lines.
This coupling is inherent in any high-performance, high-resolution
array design. The  resulting crosstalk is a function of the polarity
inversion conditions  used to drive the display.  The Figure shows an
example of a bus connection of the present method which uses a driver
chip with bipolar  outputs.  In this example, when the TFT/LCD panel
is driven in column or dot inversion conditions, the voltage polarity
of the repaired line  segment is the same as the opposite side of the
broken line.  In this way, the crosstalk on the repaired line segment
is the same as the normally dri...