Fraunhofer Launches New Addition to the Microdisplay Family

Fraunhofer launches a new addition to the microdisplay family

In addition to an energy-saving design, micro-displays for wearable devices must also display information so that they are bright enough in daylight, at best in colorful and recognizable versions with the naked eye.

The OLED The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP microdisplay family has now been expanded: microdisplay with a new design for ultra-high brightness. The new versions will be showcased for the first time at SID Display Week, May 10-12, 2022, in San José, USA.

Small, ultra-low-power, high-contrast OLED microdisplays are predestined for integration into head-up systems or wearable devices. They can be used as an assistance system in industry, in logistics to view warehouse information in employee headsets or helmets, or for navigation in low-visibility environments, eg. g. in disaster management.

In such augmented reality (AR) scenarios, in addition to an energy-saving system design, a display with significant brightness is required.

Fraunhofer FEP researchers have expanded their OLED microdisplay portfolio in this regard. This ranges from color video displays with 1-inch screen size to tiny 0.2-inch ultra-low power micro-displays. Notably, the 720p display has been boosted to high brightness levels required for use in AR applications and optical systems in daylight conditions. T.

The 720p (RGBW) full-color microdisplay is now reaching a brightness level of up to 1,000 nits, while the dual-color (RGRG) version reaches 5,000 nits. A nit indicates how much light is emitted in one square meter of surface. For example, TVs have a brightness of 200–500 nits. If OLED microdisplays are used for simple display applications, the 720p version in warm white can even reach 35,000 nits.

“Technologically, this increase in brightness was achieved by developing new OLED stacks,” said Bernd Richter, head of organic microelectronic devices at Fraunhofer FEP. “By using different filter technologies, we allow a good compromise between brightness and display content, depending on the application.”

Additionally, the institute pushed further development of ultra-low-powered variants. Along with the aforementioned displays, new variants are now being offered, which make use in wearable devices more attractive due to the longer battery life and at the same time the increased brightness.

These displays are available in black and white, dual color or warm white with new brightness levels from 5,000 to 35,000 nits. The new OLED microdisplays can now display navigation instructions much brighter in systems such as helmets for outdoor athletes or for firefighting missions, and continue to manage without interrupting charging.

“With this portfolio extension, Fraunhofer FEP offers a unique selection of microdisplays for a wide range of products align of optical and system integrations, ”added Philipp Wartenberg, head of IC and System Design. “Displays differ not only in size but also in circuit topologies. If there is no suitable microdisplay in our portfolio or if the customer has special requirements for control, we will tailor them to him or her. ”

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