Method for fabricating pixelated polymer organic light emitting

Details Method for fabricating pixelated polymer organic light emitting Method for fabricating pixelated polymer organic light emitting

1998-04-13

2000-08-29

Patel, Vip

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313505, 313507, H01J 162

Patent

active

061113565

ABSTRACT:
A display having a plurality of addressable pixels and a method for constructing the same. The display includes a substrate having a first conducting layer thereon. The conducting layer includes a plurality of parallel row electrodes having edges separated by insulating material. A first polymer layer constructed from one or more thin films overlies the parallel row electrodes. An insulating layer overlies the polymer layer, the insulating layer having windows therein defining pixels for the display. The insulating layer overlies the edges of the row electrodes while providing access to the first polymer layer in the area of the pixels. A second conducting layer overlies the insulating layer and includes a plurality of separated column electrodes. Each column electrode crosses a plurality of the row electrodes and is located over the windows in the insulating layer at points defining the pixels. The second conducting layer is preferably constructed by depositing a layer of photoresist over the insulating layer and patterning the layer of photoresist to provide openings extending therethrough. The openings are wider in the portion of the layer nearest to the insulating layer. This layer acts as a shadow mask for depositing a layer of conducting material. In one embodiment of the invention, a second polymer layer is located between the insulating layer and the second conducting layer. The insulating layer is preferably constructed from a layer of photoresist that is baked to cross-link the photoresist. The polymer layers include an electroluminescent material, which is preferably based on a polyfluorene.

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