Fraunhofer researchers developed OLED stacks
Summary
Users of augmented reality (AR) glasses require especially bright displays in daylight in order to clearly recognise content. Measurements have shown that when comparing a 1-unit and a 2-unit OLED, the lifetime LT95, i.e., the drop in brightness by 5%, at 50,000 Nits can be significantly improved from 900 to 1300 hours.” The current efficiency and brightness of 1-, 2-, and 3-fold stacked OLEDs were initially evaluated on passive test substrates and were subsequently successfully transferred to 0.62-inch CMOS backplanes with SXGA resolution. However, new challenges for further research have emerged: while conventional OLED displays often have several tens of micrometers between subpixels, in microdisplays, it is only a few hundred nanometers. The spectral emission can be specifically adjusted, facilitating the use of optical concepts with special requirements, such as waveguides or holographic elements. The researchers are convinced that the ongoing development towards ever higher brightness and improved lifetimes of OLED technology secures a firm place in the field of AR applications.