AMOLED Displays with In-Pixel Photodetector

The focus of this chapter is to consider additional functionalities beyond the regular display function of an active matrix organic light-emitting diode (AMOLED) display. We will discuss how to improve the resolution of the array with OLED lithography pushing to AR/VR standards. Also, the chapter will give an insight into pixel design and layout with a strong focus on high resolution, enabling open areas in pixels for additional functionalities. An example of such additional functionalities would be to include a photodetector in pixel, requiring the need to include in-panel TFT readout at the peripherals of the full-display sensor array for applications such as finger and palmprint sensing

15.3 An a-IGZO asynchronous delta-sigma modulator on foil achieving up to 43dB SNR and 40dB SNDR in 300Hz bandwidth

Amorphous IGZO (a-IGZO) TFTs fabricated on flexible large-area substrates provide better mobility than a-Si or organic counterparts and good uniformity. These features make a-IGZO TFTs an attractive technology for large-area sensing (e.g. strain, pressure, IR), low-cost RFIDs augmented with sensors and monitoring of biopotentials. In this context, it is crucial to accurately transform analogue sensor signals in a robust representation. The most common choice is a synchronous digital word, but a two-level PWM representation is another interesting possibility. Binary PWM can be transmitted on wire or via RF amplitude modulation with high immunity to noise and interferers