Erik van Veenendaal

Flexible electronic‐paper active‐matrix displays

A QVGA active-matrix backplane was produced on a 25-um thin plastic substrate. A four-mask photolithographic process was used. The insulator layer and the semiconductor layer were organic material processed from solution. This backplane was a combination of the electrophoretic display effects supplied by SiPix and E-Ink Corp., resulting in electronic-paper displays with a thickness of 150 and 100 um, respectively; this is the worlds thinnest active-matrix display ever made.

An 8b organic microprocessor on plastic foil

We introduce a microprocessor made by organic thin-film transistors processed directly onto flexible plastic foil. This is a direct realization of a microprocessor by thin-film technology, i.e., without transfer, on plastic. It paves the way to equip mundane supports and objects with low-cost computing power. We also demonstrate the correct execution of a digital signal-processing task, namely increasing the accuracy of a repetitive digital input by time-averaging.

3.1: Invited Paper: Rollable QVGA Active‐Matrix Displays Based on Organic Electronics

A 100 μm thin QVGA active-matrix electrophoretic display is produced using organic transistors. The display can be bent to a radius less than 1 cm without any performance loss. Higher contrast and low crosstalk was achieved by addition of a field shield to our backplane.

DC-DC converter assisted two-stage amplifier in organic thin-film transistor technology on foil

In this work an organic dual DC-DC up-converter and an organic 2-stage operational amplifier are presented, both implemented in a thin-film organic electronics technology on foil. The converter has a conversion ratio of 2.5 and only consumes 1 μA from a 15 V power supply voltage. The converter is designed for biasing gates and backgates of transistors in a p-type only technology and enables to bias both input and output nodes of a differential amplifier to the same DC voltage. This in turn enables to directly connect consecutive differential amplifier stages together. The latter is demonstrated through the 2-stage operational amplifier that has a measured gain of 20 dB and a gain-bandwidth product of 2 kHz. This opamp consumes 15 μA from a 15 V power supply.

45.1: System-on-Plastic with Organic Electronics: A Flexible QVGA Display and Integrated Drivers

A flexible 4.7-inch QVGA active-matrix electrophoretic display is demonstrated, containing 76800 solution-processed organic transistors. In the same technology, 32- and 120-stage row drivers are produced with adequate speed to drive a QVGA display. Both the display and the drivers are highly flexible. Bending the display to a radius below 2cm does not result in any performance loss.

10.3: Invited Paper: Rollable Displays: From Concept to Manufacturing

Rollable displays enable large displays in small mobile devices. A rollable QVGA display is presented that is integrated into a pocketable e-reader product. On top of that a 254ppi monochrome and a 130ppi color display are presented that are rollable to a radius of 6mm.

60.4: Invited Paper: Rollable Displays — A Technology Development Enabling Breakthrough Mobile Devices

A Rollable Display has been developed that can be rolled to a radius of 7.5mm (0.3inch). The display is of the active-matrix electrophoretic type, based on organic electronics. The display is integrated into a novel mobile device that is ready for commercial launch. The device merges the mobile phone platform and form factor with the abilities of an e-reader.

Analog Circuit Design in Organic Thin-Film Transistor Technologies on Foil: An Overview

In this work an overview is given of the progress which is made in the last few years in the domain of analog organic electronics. Subsequently several building blocks for organic smart sensor systems are brought into focus. The implementations of a two-stage DC-connected opamp, a ΔΣ ADC, a Dickson DC-DC up-converter and a capacitive touch sensor are presented. Special attention is spent to the design techniques applied for embedding the circuits in the given organic electronics technology.

A flexible, organic QVGA display with gray-scale capability

A flexible 4.7-in. QVGA active-matrix display was demonstrated, containing 76,800 solution-processed organic transistors. The combination of our plastic active-matrix backplane with electrophoretic-ink display material developed by E-Ink resulted in a reflective low-power display with paper-like appearance. By using high-performance organic transistors, it was possible to generate 2-bit images on the display. The display can be bent to a radius below 2 cm.