Browse Prior Art Database

High Resolution Full Color Displays Without Optical Cross Talk Achieved by Mirrored Spacer Walls

IP.com Disclosure Number: IPCOM000014996D
Original Publication Date: 2001-Jul-28
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Abstract

For full color display applications the avoidance of optical cross talk is of crucial importance. We describe a display architecture which allows us to fabricate pixel structures with high resolution without optical cross talk. Additionally , the efficiency is significantly enhanced.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 75% of the total text.

Page 1 of 2

  High Resolution Full Color Displays Without Optical Cross Talk Achieved by Mirrored Spacer Walls

  For full color display applications the avoidance of optical
cross talk is of crucial importance. We describe a display
architecture which allows us to fabricate pixel structures with
high resolution without optical cross talk. Additionally,the
efficiency is significantly enhanced.

Figure 1 displays the pixel structure on a real scale in a
conventional OLED display. Due to the Lambertian characteristic
of the emission, optical cross talk is unavoidable present due to
wave guiding effects and total internal reflection. These
processes reduce color purity and resolution. Moreover out
coupling efficiency is decreased.

The idea is outlined in figure 2. In contrast to the conventional
structure, our novel display consists of individual pixels which
are surrounded or partially surrounded by reflective side walls,
being composed of metals or other reflective layers (for example
semiconductors and insulating layers). If these layers consist of
metal this metal is covered with thin insulating materials to
ensure electrical isolation. These isolation materials are
typically oxides or nitrides which are transparent in the visible
spectral range. Due to the reflective surrounding, light which is
generated in the pixel structure can not be wave guided to the
next pixel. Thus optical cross talk is avoided and due to the

1

[This page contains 6 pictures or other non-text objects]

Page 2 of 2

mirror ef...