David M. Hoffman (SID Member) Abstract— We evaluat Natalie N. Stepien Wei Xiong (SID Member) ed the perceived image quality of High Dynamic Range (HDR) content rendered using different types of local dimming and organic light-emitting diode (OLED) displays. Using an OLED display that is capable of achieving high contrast at a pixel level, we emulated local dimming displays to evaluate their ima...

We propose a digital driving technique using pulse-density modulation (PDM) for an active-matrix organic light-emitting diode (AMOLED) to effectively suppress the false image contour in conventional pulsewidth modulation (PWM) while achieving considerably low operating frequency. A compact first-order digital modulator provides the PDM signal to the panel. A 2.2-inch QVGA AMOLED system using th...

A novel concept of a light-emitting diode (LED) is proposed and demonstrated in which the active region of the device is placed in a resonant optical cavity. As a consequence, the optical emission from the active region is restricted to the modes of the cavity. Resonant cavity light-emitting diodes (RCLED) have higher spectral purity and higher emission intensity as compared to conventional lig...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Lauri Riuttanen Name of the doctoral dissertation Diffusion injected light emitting diode Publisher School of Electrical Engineering Unit Department of Microand Nanosciences Series Aalto University publication series DOCTORAL DISSERTATIONS 213/2015 Field of research Optoelectronics Manuscript submitted 10 August 2015 Date of t...

We report a hybrid up-conversion device integrating a In0.2Ga0.8As/GaAs MQWs photodetector with an organic light emitting diode (OLED), that converts input 980 nm infrared light to output 520 nm green light. Devices with different interface layer, used as the hole injection layer (HIL) in OLEDs were fabricated and tested. It was found that the device with an HIL of MoO3-doped CuPc exhibited a l...

A light-mediated methodology to grow patterned, emissive polymer brushes with micron feature resolution is reported and applied to organic light emitting diode (OLED) displays. Light is used for both initiator functionalization of indium tin oxide and subsequent atom transfer radical polymerization of methacrylate-based fluorescent and phosphorescent iridium monomers. The iridium centers play k...

Efficient organic light-emitting diodes have been developed using emitters containing rare metals, such as platinum and iridium complexes. However, there is an urgent need to develop emitters composed of more abundant materials. Here we show a thermally activated delayed fluorescence material for organic light-emitting diodes, which realizes both approximately 100% photoluminescence quantum yie...

We have demonstrated an approach to enhance the light extraction efficiency for organic light emitting diode sOLEDd. Nanoporous alumina film was used to modify the optical wave propagation and coupling of light from the OLED. Experimental results showed an increase of over 50% in the coupling efficiency of the nanoporous device, without affecting the electrical properties of the OLED. Effective...