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Printing Process Using Sublimable Dye to Make TFT Color Screens

IP.com Disclosure Number: IPCOM000120482D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Karidis, J: AUTHOR [+2]

Abstract

Disclosed is a process to print color TFT screens using ribbons that have an ink layer made from sublimable dyes. The ribbon is heated with an embossed drum.

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This is the abbreviated version, containing approximately 81% of the total text.

Printing Process Using Sublimable Dye to Make TFT Color Screens

      Disclosed is a process to print color TFT screens using ribbons
that have an ink layer made from sublimable dyes. The ribbon is
heated with an embossed drum.

      The surface of the drum has raised squares on it that are
approximately 4 mil by 4 mil.  Each square is positioned around the
surface of the drum, so that when the drum is rotated each square
will match the required position on the TFT screen.  Three drums are
required, one for each color, and the position of the squares of each
drum will match that for its color.  The screen will require a
receptor layer on the surface to receive the sublimable dye from each
of the colored ribbons.

      Each colored ribbon with its respective heated drum is passed
over the TFT screen surface that has the receptor layer.  As the drum
passes over the ribbon, the heated raised squares come into contact
with and heat the ribbon. The sublimable dye is then transferred to
the receptor layer on the screen.  Each of the drums is carefully
aligned, one to the other, and to the screen, so that the transferred
sublimable dye is in the correct position on the surface of the TFT
screen.

      Alternatively, a single drum could be used in three passes,
where a different ribbon is used for each pass, and the position of
the glass substrate is accurately shifted between passes to provide
the proper alignment.

      If it is desired to use existin...