United Kingdom, 14th March 2005 - Cambridge Display
Technology (CDT) [Nasdaq: OLED] has had a number of
key, new patents allowed in the United States, Europe
and Canada, further expanding its extensive portfolio
of intellectual property (IP) in the field of organic
light emitting diodes (OLEDs) used for display and
Among the patents now allowed in the US is a patent
relating to OLEDs which comprise hole transport, electron
transport and emissive components, using type II interfaces,
contained in the same molecule. This is believed to
be of considerable importance in the context of the
printing of OLED devices. Molecules containing ‘type
II’ interfaces are believed to be important in achieving
high efficiency display devices.
Other new US patents allowed
include a patent relating to the use of a dielectric
barrier layer over the key emissive layer to protect
it from damage due to sputtering of a conductive layer.
This is expected to have important application in
top emitting devices in which the light does not have
to pass between the transistors but, more efficiently,
through a transparent cathode structure.
Another allowed patent is jointly
owned with Seiko Epson Corporation and covers certain
solvents used in ink formulations for ink jet printing
of polymer OLEDs.
These patents are the result of work
carried out over the last few years by CDT into all
areas of P-OLEDs, including materials development,
device optimisation and manufacturing process development.
The ability of manufacturers to print
displays is seen as key to the ability to produce
lower cost, ever-larger display sizes e.g. for OLED
televisions. The use of ink jet printing is seen by
many companies as the best current approach to the
challenges of manufacture of OLED displays.
As at February 2005, CDT had over
160 published or unpublished families of patents and
patent applications. It has exclusive control of further
patents held by the Universities of Oxford, Cambridge
and St. Andrews. It holds sub-licensing rights to
the extensive portfolio of patents relating to P-OLED
devices belonging to the Seiko Epson Corporation.
Cambridge Display Technology is a pioneer in the development
of light emitting polymers (P-OLEDs) and their use
in a wide range of electronic display products used
for information management, communications and entertainment.
P-OLEDs are part of the family of organic light emitting
diodes, or OLEDs, which are thin, lightweight and
power efficient devices that emit light when an electric
current flows. P-OLEDs offer an enhanced visual experience
and superior performance characteristics compared
with other flat panel display technologies such as
liquid crystal displays. Founded in 1992, the company
is headquartered in Cambridge, UK and listed on the
US Nasdaq stock exchange under the symbol ‘OLED’.
More information can be found at: www.cdtltd.co.uk
+44 1954 713656