Microdisplays based on organic light-emitting diodes (OLEDs) achieve high optical performance with excellent contrast ratio and large dynamic range at low power consumption. The direct light emission from the OLED enables small devices without additional backlight, making them suitable for mobile near-to-eye (NTE) applications such as viewfinders or head-mounted displays (HMD). In these applications the microdisplay acts typically as a purely unidirectional output device [1-3]. With the integration of an additional image sensor, the functionality of the microdisplay can be extended to a bidirectional optical input/output device. The major aim is the implementation of eye-tracking capabilities in see-through HMD applications to achieve gaze-based human-display-interaction
Ground-breaking, active illumination-free concept enables new projection applicationsAn ultra compact projection system based on a high brightness OLED micro display is developed. System design and realization of a prototype are presented. This OLED pico projector with a volume of about 10 cm³ can be integrated into portable systems like mobile phones or PDAs. The Fraunhofer IPMS developed the high brightness monochrome OLED micro display. The Fraunhofer IOF designed the specific projection lens [1] and integrated the OLED and the projection optic to a full functional pico projection system. This article provides a closer look on the technology and its possibilities.
First prototypes of bi‐directional OLED microdisplay devices that combine both display and camera functionality on a single CMOS chip (OLED‐on‐CMOS) have been designed. The major goal of this integration is to provide capabilities for eye‐tracking in see‐through HMDs to achieve gaze‐based human–display interaction, e.g., in augmented‐reality applications. The development of the prototype was accompanied by user studies with a simulated bi‐directional microdisplay consisting of a commercially available eye‐tracker and a see‐through HMD. These tests were aimed at providing basic minimum requirements in terms of temporal and spatial resolution of an eye‐tracker to be implemented within the prototype, as well as to evaluate ergonomics of an appropriate user‐interface design. A description of the current state of the hardware architecture and design aspects for bi‐directional OLED microdisplays are also presented.
First prototypes of bi-directional OLED microdisplay devices have been designed, that combine both display and camera functionality on a single CMOS chip (OLED-on-CMOS). Major aim of this integration is to provide capabilities for eye-trackingin see-through HMD to achieve gaze-based human-displayinteraction, e.g. in augmented-reality applications.
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