Integration of large‐area optical imagers for biometric recognition and touch in displays

Akkerman, Hylke B.; Peeters, Bart; Breemen, Albert J. J. M. van; Shanmugam, S.; Lopez, Leslye Ugalde; Tordera, Daniel; Ketterij, Richard van de; Delvitto, Ezequiel; Verbeek, Roy; Malinowski, Paweł E.; Ke, Tung Huei; Roose, Florian De; Hagelsieb, Luis Moreno; Katsouras, Ilias; Kronemeijer, Auke Jisk; Meulenkamp, Eric A.; Gelinck, Gerwin

doi:10.1002/jsid.1060

Cited by 9 publications

(6 citation statements)

References 20 publications

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“…With the advent of the Internet-of-Things era, however, new applications emerge in which light sensing is integrated in everyday objects and this calls for novel photoactive materials and processes. Emerging application examples include transparent imagers for smart glass applications [15], in-display biometric imagers [16][17][18] and photonic patches that can measure vital signs [19,20]. These applications typically require large-area and/or flexible substrates.…”

Section: Introduction To Printable Photodetectorsmentioning

confidence: 99%

Roadmap on printable electronic materials for next-generation sensors

Pecunia,

Petti,

Andrews

et al. 2024

Nano Futures

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The dissemination of sensors is key to realizing a sustainable, ‘intelligent’ world, where everyday objects and environments are equipped with sensing capabilities to advance the sustainability and quality of our lives—e.g., via smart homes, smart cities, smart healthcare, smart logistics, Industry 4.0, and precision agriculture. The realization of the full potential of these applications critically depends on the availability of easy-to-make, low-cost sensor technologies. Sensors based on printable electronic materials offer the ideal platform: they can be fabricated through simple methods (e.g., printing and coating) and are compatible with high-throughput roll-to-roll processing. Moreover, printable electronic materials often allow the fabrication of sensors on flexible/stretchable/biodegradable substrates, thereby enabling the deployment of sensors in unconventional settings. Fulfilling the promise of printable electronic materials for sensing will require materials and device innovations to enhance their ability to transduce external stimuli—light, ionizing radiation, pressure, strain, force, temperature, gas, vapours, humidity, and other chemical and biological analytes. This Roadmap brings together the viewpoints of experts in various printable sensing materials—and devices thereof—to provide insights into the status and outlook of the field. Alongside recent materials and device innovations, the roadmap discusses the key outstanding challenges pertaining to each printable sensing technology. Finally, the Roadmap points to promising directions to overcome these challenges and thus enable ubiquitous sensing for a sustainable, ‘intelligent’ world.

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Section: Introduction To Printable Photodetectorsmentioning

confidence: 99%

Roadmap on printable electronic materials for next-generation sensors

Pecunia,

Petti,

Andrews

et al. 2024

Nano Futures

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“…10 Other applications require the integration of the imager in front of a display (such as phones, computers, or ATMs), where semitransparent devices are needed. 11 Semitransparent devices can be obtained via downscaling of the active area (e.g. by photolithography), 12 by using materials that are transparent in the visible spectrum (narrow bandgap semiconductors) [13][14][15] or by using very thin semiconductors in combination with transparent electrodes, such as transparent conducting oxides (TCOs), graphene, organic or nanostructured electrodes.…”

Section: Introductionmentioning

confidence: 99%

Semitransparent near-infrared Sn–Pb hybrid perovskite photodetectors

et al. 2022

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“…A transmittance above 70% in the visible wavelength range is required, even in low-end ATM displays 13 . To make the NIR-sensitive OPD array visually transparent, it must have transparent conductive electrodes (TCEs).…”

Section: Introductionmentioning

confidence: 99%

A touchless user interface based on a near-infrared sensitive transparent optical imager using printed Cu grid electrodes.

Kamijo

Breemen

et al. 2022

Preprint

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Touchless technology based on user interaction modes such as voice or gestures is paving the way for tomorrow’s digital ecosystems, accelerated by hygiene requirements resulting from the COVID-19 pandemic. Gesture-based touchless user interfaces typically use near-infrared (NIR) cameras. The applicability of these systems is hampered by their limitations in field of view and their calibration requirements for high accuracy. Here, we show a novel touchless user interface based on a large-area visually transparent NIR-sensitive 16 × 16 organic photodetector (OPD) array that can be used on top of a display as a touchless user interface. Optical transparency is realized by implementing a printed copper (Cu) grid as a bottom transparent conductive electrode (TCE) and an array of patterned OPD subpixels. Electro-optical modelling enabled an optimal image sensor design that resulted in a high photodetectivity of ca. 1012 Jones at 850 nm and high visible-light transmittance of 70%. We demonstrate that our imager can be used as a penlight- and gesture controlled touchless user interface when combined with a commercial display.

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Integration of large‐area optical imagers for biometric recognition and touch in displays

Cited by 9 publications

References 20 publications

Roadmap on printable electronic materials for next-generation sensors

Roadmap on printable electronic materials for next-generation sensors

Semitransparent near-infrared Sn–Pb hybrid perovskite photodetectors

A touchless user interface based on a near-infrared sensitive transparent optical imager using printed Cu grid electrodes.

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