Jurgen Jean Louis Hoppenbrouwers

Towards large‐area full‐color active‐matrix printed polymer OLED television

Abstract— We have developed a new multi-head polymer OLED ink-jet-printing technology to make large-screen OLED television displays. This printer is used to make a 13-in.-diagonal 16:9-format polymer-OLED prototype driven by an LTPS active matrix with a pixel circuit which compensates for TFT threshold-voltage variations. A novel scrolling-bar addressing scheme is used to reduce motion artifacts and to make sparkling images with a high local peak brightness. The scalability of the polymer-OLED technology to larger sizes for television applications is discussed.

44.4: Distinguished Paper: Towards Large‐Area Full‐Color Active‐Matrix Printed Polymer OLED Television

We have developed a new multi-head Polymer OLED inkjet print technology to make large screen OLED television. This printer is used to make a 13″ diagonal 16:9 format Polymer OLED prototype driven by an LTPS active matrix with a pixel circuit which compensates for TFT threshold voltage variations. A novel scrolling-bar addressing scheme is used to make sparkling images with a high local peak brightness. Color processing is used to improve the overall perception of the image.

25.3: Spectrum Sequential Liquid Crystal Display

Conventional displays cannot show all real-world colours. We have made a 30-inch Spectrum Sequential LCD that uses two different types of fluorescent lamps that alternately illuminate the panel. In this way, a 6 primary display is obtained with a 22% larger colour gamut, without modifying the panel itself.

43.4: Address Time Reduction in PDPs by means of Partial Line Doubling

This paper describes a technique, called Partial Line Doubling (PLD), that reduces the over-all addressing time of PDPs. This reduction goes at the cost of vertical resolution but the picture quality deterioration is minimised by using appropriate video processing algorithms. The resulting time gain can be used to increase the peak white level of the PDP and/or add extra subfields.

Video processing for active‐matrix polymer OLED TV

— Active-matrix OLED panels have inherent features that allow a higher-quality image reproduction than LCD panels, i.e., high-contrast, fast response time, and the capability to produce locally high peak luminance levels. We demonstrated a 13-in.-ink-jet-printed active-matrix polymer-OLED prototype for TV applications at SID 2004. This prototype is used as a carrier for studying video-processing algorithms that take full advantage of the specific characteristics of OLEDs. Addressing schemes, gamut conversion, histogram-based brightness control, and sparkle processing will be discussed.