OLED Inkjet printing
CDT is sole supplier of the Litrex range of Ink Jet Printers (70/120/142/M4 (Gen 4)). Cambridge Display Technology have also partnered industry leaders across the globe to offer a fully inclusive ink jet package. To support the Litrex printer range CDT can offer materials, print heads, know-how and skills development packages.
Recognising the importance of developing this field of expertise and supporting its licensees and partners in scaling up for production, CDT has installed the largest ink jet printing facility of its type, and offers a total solution covering all aspects of making displays using ink jet printing.
The focus for the efforts is a solution which is:
gives reliable operation and high uptime
produces high resolution PLED displays
In 2005 CDT announced another important step in the development of polymer light emitting diode (P-OLED) display technology with the production of a number of 14 inch full color displays using ink jet printing. The displays were produced at CDT’s Technology Development Centre in the UK, and feature a resolution of 1280 x 768 pixels x RGB, equivalent to almost three million sub-pixels, or over 30 million ink jet drops.
The active matrix panels use an amorphous silicon backplane, and were made using a multi-nozzle approach – up to 128 nozzles – with no interlacing, and are believed to be the first of their kind ever produced.
The development strengthens CDT’s view that multi-nozzle ink jet printing is the best approach to achieving scaleability and a low TAC time in the manufacture of high quality P-OLED displays.
Earlier this year, CDT demonstrated several 5.5 inch displays, and the latest 14 inch displays are part of a continuing program to develop both the underlying P-OLED technology and the means of manufacture. The WXGA+ panels were produced using printers from the Litrex Corporation, a company in which CDT currently has a 50% holding.
More about OLED Inkjet Printing and PLED at
Also in the year 2005 Toppan Printing Co., Ltd. has developed the world´s first full color organic light emitting diode (OLED) display using a printing method for the patterning of RGB light emitting polymer layers. A 5-inch QVGA (320×240 pixels) passive display prototype has been successfully produced using this method.
Specifications of prototype:
Size: 5 inch diagonal
No. of Pixels: 320 x 240 (QVGA)
Pixel size: 360um