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Patterning of Organic Electroluminescent Devices Through an Encapsulation Layer

IP.com Disclosure Number: IPCOM000123343D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Haskal, EI: AUTHOR [+2]

Abstract

Disclosed is a method for patterning the surface of an organic light-emitting device (OLED) after the organic materials have been deposited. The fabrication of displays using organic electroluminescent materials is complicated by the fact that the materials typically used in OLEDs exhibit thermal and chemical stability which is inferior to the inorganic materials used in standard displays (1). Once the organic materials in a standard OLED are deposited (1), the device cannot be heated, immersed in water, acids or bases. This means that it is not possible to apply standard photolithographic techniques to the display substrates once the organic materials have been deposited, because of the exposure to wet chemicals.

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Patterning of Organic Electroluminescent Devices Through an Encapsulation
Layer

   Disclosed is a method for patterning the surface of an
organic light-emitting device (OLED) after the organic materials
have been deposited.  The fabrication of displays using organic
electroluminescent materials is complicated by the fact that the
materials typically used in OLEDs exhibit thermal and chemical
stability which is inferior to the inorganic materials used in
standard displays (1).  Once the organic materials in a standard
OLED are deposited (1), the device cannot be heated, immersed in
water, acids or bases.  This means that it is not possible to apply
standard photolithographic techniques to the display substrates once
the  organic  materials have been deposited, because of the exposure
to wet chemicals.  It is, however, desirable to do some processing
and patterning at  this point so as to allow another degree of
freedom for the engineering of the displays.  For example, in order
to obtain a simple passive matrix structure, the cathode on top of
the organic materials needs to be patterned  into  stripes
perpendicular  to the anode stripes.  The typical solution  to  this
problem is to do all of the patterning on the substrate before  the
organic  materials are deposited, where tapered structures  are
prepared on the substrate which break up the deposited films (2).

   The disclosed method involves the use of a stable and
inert encapsulation layer which is prepared on the surface on the
OLED and serves...