OLED display incorporating organic photodiodes for fingerprint imaging

Kamada, Taisuke; Hatsumi, Ryo; Watanabe, Kazunori; Kawashima, Susumu; Katayama, Masahiro; Adachi, Hiroki; Ishitani, Tetsuji; Kusunoki, Koji; Kubota, Daisuke; Yamazaki, Shunpei

doi:10.1002/jsid.786

Cited by 22 publications

(26 citation statements)

References 23 publications

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“…OPDs have also been used in prototypes of biometric fingerprint and palmprint scanners, where the OPD array detects visible light reflected by the finger or hand, respectively, as well as for gesture recognition. Fingerprint imaging is achieved by utilizing a difference in reflectance between the finger ridges and valleys.…”

Section: Introductionmentioning

confidence: 99%

Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current

Simone

Dyson

Meskers

et al. 2019

Adv Funct Materials

289

357

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Organic photodetectors (OPDs) have gained increasing interest as they offer cost-effective fabrication methods using low temperature processes, making them particularly attractive for large area image detectors on lightweight flexible plastic substrates. Moreover, their photophysical and optoelectronic properties can be tuned both at a material and device level. Visible-light OPDs are proposed for use in indirect-conversion X-ray detectors, fingerprint scanners, and intelligent surfaces for gesture recognition. Near-infrared OPDs find applications in biomedical imaging and optical communications. For most applications, minimizing the OPD dark current density (J d ) is crucial to improve important figures of merits such as the signal-to-noise ratio, the linear dynamic range, and the specific detectivity (D*). Here, a quantitative analysis of the intrinsic dark current processes shows that charge injection from the electrodes is the dominant contribution to J d in OPDs. J d reduction is typically addressed by fine-tuning the active layer energetics and stratification or by using charge blocking layers. Yet, most experimental J d values are higher than the calculated intrinsic limit. Possible reasons for this deviation are discussed, including extrinsic defects in the photoactive layer and the presence of trap states. This provides the reader with guidelines to improve the OPD performances in view of imaging applications.

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Section: Introductionmentioning

confidence: 99%

Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current

Simone

Dyson

Meskers

et al. 2019

Adv Funct Materials

289

357

View full text Add to dashboard Cite

show abstract

“…There are several manufacturing methods to integrate OLEDs and OPDs, side-by-side. SEL demonstrates a 212 ppi R-G-B-PD array by Fine Metal Mask (FMM) [2]. The OPD materials are evaporated through the metal shadow mask to create a photoresponse island array like the redgreen-blue emitting pixels.…”

Section: Introductionmentioning

confidence: 99%

“…Another possible challenge is to reduce the crosstalk between OLED and OPD pixels. Efforts had been made to introduce a light-shielding layer between OLED and OPD pixels to present crosstalk [2]. It makes it more challenging to increase the pixel density.…”

Section: Introductionmentioning

confidence: 99%

55.1: Invited Paper: Photolithographic patterning of OLED and OPD for invisible sensor integration in mobile display

Georgitzikis

Alvarez

et al. 2021

Symp Digest of Tech Papers

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We apply a photolithographic patterning process to integrate a green phosphorescent organic light emitting diode (OLED) with a polymer‐based organic photodetector (OPD) side‐by‐side with resolution up to 635 ppi. The characteristics of OLED and OPD before and after patterning are investigated. The crosstalk between OLED and OPD subpixels and the linearity of the integrated OPD under different luminance are also studied. The results indicate that photolithography enabled integration is an encouraging route of organic and hybrid electronics (OHEs) manufacturing.

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“…Their device structures are also similar: both OPDs and OLEDs comprise an active layer or a light-emitting layer between the hole and electron transport layers and between electrodes. We took advantage of the similarity between OLED and OPD device structures to fabricate a prototype display that incorporates an OPD in each pixel through side-by-side patterning, which is generally used to fabricate OLED displays [6].…”

Section: Introductionmentioning

confidence: 99%