Customers of augmented actuality (AR) glasses require particularly vibrant shows in daylight to obviously acknowledge content material. Excessive brightness and low energy consumption are due to this fact essential growth objectives, as optical techniques—equivalent to AR glasses—exhibit excessive brightness losses and wearable units are restricted by battery storage.
The Fraunhofer IPMS is now introducing a extremely environment friendly, monochrome OLED microdisplay with a brightness of greater than 70,000 Nits. The OLED stack used even achieves greater than 200,000 Nits on reference substrates.
Johannes Zeltner, a Ph.D. pupil at Fraunhofer IPMS, explains, “By stacking OLED layers, this excellent brightness was achieved. The person OLED models are collection related, which will increase the brightness with every further unit with out elevating the present density within the element.
“This may be utilized to both obtain extraordinarily excessive brightness or, at a given brightness, to considerably scale back the present density that determines lifetime. Measurements have proven that when evaluating a 1-unit and a 2-unit OLED, the lifetime LT95, i.e., the drop in brightness by 5%, at 50,000 Nits will be considerably improved from 900 to 1300 hours.”
The present effectivity and brightness of 1-, 2-, and 3-fold stacked OLEDs have been initially evaluated on passive take a look at substrates and have been subsequently efficiently transferred to 0.62-inch CMOS backplanes with SXGA decision.
New challenges for additional analysis have emerged: Whereas typical OLED shows usually have a number of tens of micrometers between subpixels, in microdisplays, it’s just a few hundred nanometers. This will result in crosstalk between adjoining pixels in thicker layer stacks and a number of stacked OLEDs in microdisplays. Approaches to cut back this crosstalk are in preparation.
Moreover, the work has proven that a number of stacking permits for narrowband emission with excessive brightness. The spectral emission will be particularly adjusted, enabling using optical ideas with particular necessities, equivalent to waveguides or holographic components.
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Fraunhofer-Institut für Photonische Mikrosysteme (IPMS)
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Novel OLED stacks allow exceptionally vibrant microdisplays (2025, January 14)
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