Prashant Mandlik

Wearable 4‐in. QVGA full‐color‐video flexible AMOLEDs for rugged applications

— Work on the worlds first wrist-worn communications device built on a flexible, low-power-consumption full-color AMOLED using phosphorescent OLEDs is presented. The device offers the wearer the ability to see high-information-content video-rate information in a thin-and-rugged-form-factor 4-in. QVGA display, conformed around a human wrist.

66.4: Invited Paper: Challenges and Opportunities in Scaling Up OLED Lighting Devices

In this paper we discuss the challenges involved in scaling from small size pixels to large area OLED lighting panels, with specific focus on panel luminance uniformity, resistive loss and lifetime. We also discuss panel design and report results for a 15 cm × 15 cm phosphorescent OLED (PHOLED) lighting panel.

10.1: Invited Paper: Wearable 4‐Inch QVGA Full Color Video Flexible AMOLEDs for Rugged Applications

We present our work on the worlds first wrist worn communication device built upon a flexible low power consumption full color AMOLED using phosphorescent materials. The device offers the wearer the ability to see high information content video rate information in a thin and rugged form factor 4-inch QVGA display, conformed around a human wrist.

Recent progress of flexible AMOLED displays

Significant progress has been made in recent years in flexible AMOLED displays and numerous prototypes have been demonstrated. Replacing rigid glass with flexible substrates and thin-film encapsulation makes displays thinner, lighter, and non-breakable - all attractive features for portable applications. Flexible AMOLEDs equipped with phosphorescent OLEDs are considered one of the best candidates for low-power, rugged, full-color video applications. Recently, we have demonstrated a portable communication display device, built upon a full-color 4.3-inch HVGA foil display with a resolution of 134 dpi using an all-phosphorescent OLED frontplane. The prototype is shaped into a thin and rugged housing that will fit over a users wrist, providing situational awareness and enabling the wearer to see real-time video and graphics information.

Large-area high-efficiency flexible PHOLED lighting panels

Organic Light Emitting Diodes (OLEDs) provide various attractive features for next generation illumination systems, including high efficiency, low power, thin and flexible form factor. In this work, we incorporated phosphorescent emitters and demonstrated highly efficient white phosphorescent OLED (PHOLED) devices on flexible plastic substrates. The 0.94 cm2 small-area device has total thickness of approximately 0.25 mm and achieved 63 lm/W at 1,000 cd/m2 with CRI = 85 and CCT = 2920 K. We further designed and fabricated a 15 cm x 15 cm large-area flexible white OLED lighting panels, finished with a hybrid single-layer ultra-low permeability single layer barrier (SLB) encapsulation film. The flexible panel has an active area of 116.4 cm2, and achieved a power efficacy of 47 lm/W at 1,000 cd/m2 with CRI = 83 and CCT = 3470 K. The efficacy of the panel at 3,000 cd/m2 is 43 lm/W. The large-area flexible PHOLED lighting panel is to bring out enormous possibilities to the future general lighting applications.

17.3: aSi:H Thinfilm Transistors with a New Hybrid Dielectric Highly Stable under Mechanical and Electrical Stress

A resilient, homogeneous, hybrid of silicon dioxide and silicone polymer deposited at roomtemperature replaces the conventional, brittle, silicon nitride barrier layer and gate insulator in amorphous silicon thinfilm transistorsaSi:H TFTs on flexible polyimide foil. The electron fieldeffect mobility is high at 1.6 cm2/V⋅s, and the threshold voltage shift under high gate bias is comparable to that in conventional aSi:H/SiNx TFTs fabricated at 300°C. The substhreshold slope is 290 mV/decade. The new transistors are highly flexible, as they can be bent down to 0.5 mm radius 5% strain in tension and down to 1mm radius 2.5% strain in compression. These TFTs qualify for rollout screens of handheld devices.