Organic Light Emitting Diode Screens Research Articles

Theoretical analysis and validation of high-sensitivity and broadband ultrasonic sensors for under-display fingerprint imaging

Under-display ultrasonic fingerprint imaging presents a promising approach for smart terminal device authentication, which requires ultrasonic waves to penetrate organic light-emitting diode (OLED) screen composed of multiple layers, necessitating ultrasonic sensors with high sensitivity. To address this issue, this study first establishes a physics-based multi-layer model that describes the ultrasonic wave propagation behavior in an OLED screen. The optimal design parameters of the ultrasonic fingerprint sensor are explored by using the multi-layer model and the Krimholtz-Leedom-Matthaei (KLM) model. A PIN-PMN-PT single crystal-based micro-sized ultrasonic sensor with a center frequency of 33 MHz is then successfully fabricated, simultaneously achieving small aperture size (300 µm × 300 µm) and high performance. The sensor exhibits a broad bandwidth (−6 dB: 77.01 %) and high sensitivity (−42.55 dB), as well as superior spatial resolution (lateral: 112.48 μm, axial: 45.06 μm). This study provides valuable design guidance for enhancing ultrasonic fingerprint sensor performances.

P‐71: Analysis of Bright, Vertical, Chain‐Like Spot Occurrence on Mobile OLED Screen Due to the Electromagnetic Interference of Nearby GSM Device

Electromagnetic Interference (EMI) plays a significant role on degraded image quality under specific operating conditions. During our product characterizations, we analyzed an event that shows bright vertical chain‐like spots on mobile Organic Light‐emitting Diode (OLED) display due to the transmit operation of Global System for Mobile (GSM) phone nearby the device under test (DUT). The cause of the event is laid out as follows. The transmitted Radio Frequency (RF) power travels through Flexible Printed Circuit (FPC) to Display Driver Integrated Circuit (DDIC). Then the transistors respond to RF power as unintended RF diodes, which generate unexpected Direct Current (DC) voltage, which pushes the panel‐driving buffer Operational Amplifier's (OPAMP) output drifted.

High-resolution display screen as programmable illumination for Fourier ptychography

We introduce a new programmable illumination strategy for Fourier ptychographic microscopy (FPM), utilizing a high-resolution organic light-emitting diode (OLED) display screen at the vicinity of the sample to achieve super-resolution and quantitative phase imaging of biological samples. High-density pixels in the OLED screen allow for the angle-scanning illumination required for FP by placing the sample slide directly on the screen, where multiple images of the sample are captured while scanning the pixels on the screen. We discuss the design of the OLED-FP illumination and the corresponding image reconstruction strategies and experimentally validate the super-resolution and phase imaging capabilities of FP using a smartphone screen as illumination. Further, we extend our method to patterned illumination strategies, which multiplexes multiple illumination pixels to achieve full-field FP imaging with a reduced number of measurements, where we identify an optimal illumination pattern and density to maximize the imaging speed without sacrificing the image quality. Our approach offers a simple and compact programmable illuminator that can effectively transform any microscope into a compact FPM with resolution improvement and phase imaging capabilities.

Effects on the Ocular Surface from Reading on Different Smartphone Screens: A Prospective Randomized Controlled Study.

The purpose of this study was to investigate the influence of smartphone reading on the ocular surface and to compare the various effects of different screens and light conditions on the ocular surface. One hundred nineteen volunteers were randomly divided into: light + organic light‐emitting diode (OLED), light + electronic ink (eINK), dark + OLED, and dark + eINK. Ocular surface examinations, including noninvasive break‐up time (NIBUT), noninvasive keratograph tear meniscus height (NIKTMH), ocular redness, fluorescein break‐up time (FBUT), corneal fluorescein staining, meibomian gland assessment, Schirmer I Test, and blinking frequency, were performed before and after a reading task. Symptoms were evaluated using the Ocular Surface Disease Index (OSDI) and Computer Vision Syndrome Questionnaire (CVS‐Q). NIBUT and FBUT were decreased statistically significantly after participants read on an OLED screen for 2 hours compared with the baseline in light and dark environments, whereas no statistically significant decrease was observed on an eINK screen. NIKTMH was statistically significantly decreased after reading on an OLED screen in light and dark settings, and the eINK screen had a lesser effect on NIKTMH. An obvious increase in the ocular redness, OSDI and CVS‐Q scores was observed after reading on an OLED screen, whereas the eINK screen had a lesser effect on these indicators. Blink rate increased gradually in OLED subgroups during the reading task, whereas no statistically significant difference was observed in the eINK subgroups. Our research suggested that reading on an OLED screen can cause ocular surface disorder and obvious subjective discomfort, whereas reading on an eINK screen can minimize ocular surface disorder in both dark and light environments.

Construction, Application and Verification of a Novel Formaldehyde Gas Sensor System Based on Ni-Doped SnO2 Nanoparticles

An efficient formaldehyde (HCHO) gas sensor system based on nickel-doped tin oxide (Ni-doped SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) nanoparticle sensor and back-end circuit has been developed. Ni-doped SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoparticles are prepared by a simple one-step hydrothermal method. To complete the function of detecting HCHO gas in real time, a back-end circuit suitable for resistance measurement of nanoparticle sensors and an organic light emitting diode screen which can display the output of gas concentration data are integrated as a portable device. Compared with the traditional HCHO detection device, this designed system exhibits better stability, excellent selectivity, and high response. Its detection limit is as low as 90 ppb. The gas response to 50 ppm HCHO is 67.63. Further for the quantitative evaluation, we refer to and modify the existing HCHO diffusion model, then carry out a practical test on the HCHO diffusion at the same time. The comparison between the theoretical fitting curve and the actual test curve matched well enough to reflect the potential of this system for the practical HCHO evaluation.

OLED Screens Better Exhibit the Color Black than LCD Screens

We performed an experiment to determine the amount of light emitted from screens in order to assess the ability of organic light emitting diode screens (OLED) and liquid crystal display (LCD) screens to display the color black. These two competing screen types dominate the digital market, and the capability to exhibit black is one of many factors that should be considered when determining the better of the options. The better a screen can show black, the stronger the contrast of the screen appears to be. The mechanisms that create light within each suggest that OLED screens should be able to show the color black, while LCD screens may not. Therefore, we hypothesized that the light emitted from the LCD screen in this state would be significantly greater than in the OLED. We conducted thirty trials in an environment that eliminated all external light, allowing an accurate recording of emitted light. The results mostly supported our hypothesis: there was a significant increase in light emitted in the LCD screen compared to the OLED when both displayed identical black images at full brightness, though at minimum brightness the LCD performed with negligible difference than OLED.

Development of a portable and sensitive blood serum test system using LED-based absorption photometry and pump-free microfluidic technology

We reported a novel integrated portable human blood system based on absorption photometry and microfluidic technology. A capillary pump for fluid control was embedded in microfluidic chip instead of heavy syringe pump. The analytes could automatically flow, mix and react in chip. It achieves long-term stability of hydrophilic microfluidic channel surface for rapid and sensitive detection. Herein, we detected three analytes from human blood, including triglyceride (TGL), albumin (ALB) and total protein (TP) which are very important for health examination. All components of this system including light-emitting diode (LED) light source, microfluidic chip, photodiode detector (PD), electronic circuit, Organic LED screen and memory card were fully integrated into a portable instrument with small size (11.2 × 7.2 × 6.1 cm). The pair of LED and PD was used for measuring light absorbance of biochemical assay. The limit of detections (LODs) for TGL, ALB and TP were estimated to be below 0.1 mmol/L, 4 g/L and 10 g/L respectively, which is significantly below the clinical cut-off value. Passing − Boblok regression analyses were used to achieve the evaluation for this system. It showed good accuracy and feasibility of our system and was expected to be useful as a potential clinical tool for human blood serum test.

PD15-06 NOVEL IMAGE MONITORING SYSTEM USING A HEAD-MOUNTED DISPLAY FOR ASSISTANTS IN DA VINCI SURGERY

You have accessJournal of UrologyTechnology & Instruments: Laparoscopy and Robotics: Malignant Disease I1 Apr 2015PD15-06 NOVEL IMAGE MONITORING SYSTEM USING A HEAD-MOUNTED DISPLAY FOR ASSISTANTS IN DA VINCI SURGERY Soichiro Yoshida, Shohei Fukuda, Toshihiro Kanda, Naotaka Fukui, Kazutaka Saito, Yasuhisa Fujii, Yukio Kageyama, and Kazunori Kihara Soichiro YoshidaSoichiro Yoshida More articles by this author , Shohei FukudaShohei Fukuda More articles by this author , Toshihiro KandaToshihiro Kanda More articles by this author , Naotaka FukuiNaotaka Fukui More articles by this author , Kazutaka SaitoKazutaka Saito More articles by this author , Yasuhisa FujiiYasuhisa Fujii More articles by this author , Yukio KageyamaYukio Kageyama More articles by this author , and Kazunori KiharaKazunori Kihara More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2015.02.1323AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES The da Vinci Surgical System (Intuitive Surgical Inc., Sunnyvale, CA) allows an immersive three-dimensional (3D) view to be conferred to the operator through the surgeon console viewer. This image monitoring system has dramatically changed the way endoscopic images are viewed. However, only the console surgeon can use this image, and da Vinci surgery assistants still use a flat panel display. The head-mounted display (HMD) is a novel image display that allows the wearer to monitor the sharp and high-contrast 3D image in front of the eyes in an ergonomically efficient posture. We developed a new distinctive image monitoring system for assistants in the da Vinci surgery, by combining HMD to the 3D endoscope of the da Vinci surgical system. METHODS We selected the HMD system (Sony Corporation, Tokyo, Japan), which is designed for medical use, and which consists of HMD (HMM-3000MT) and an imaging processor unit (HMI-3000MT). HMM-3000MT is a binocular 3D-HMD composed of 0.7-inch organic light-emitting diode screens (resolution: 1,280 × 720 pixels) for each eye. The imaging information for the da Vinci surgical system 3D endoscope is output to the HMD system through a 3D control unit (Skyjet, Kobe, Japan). The imaging information can be split on the imaging processor unit and output into two HMDs. We used this image monitoring system as a personal imaging monitor for the assistant in robot-assisted laparoscopic radical prostatectomy (RALP). RESULTS Two assistants participated in RALP. Each assistant wore the HMD during the operation. The assistants could simultaneously and seamlessly share the same 3D high-resolution view as the console surgeon, as it was in front of their eyes irrespective of their head position. During HMD use, the wearer could also use direct vision by looking downward, which has little impact on the eye□fs field of view. CONCLUSIONS This is a first image monitoring system that uses HMD for the assistants in the da Vinci surgery. This novel system will help the assistants technically facilitate the RALP surgery. © 2015 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 193Issue 4SApril 2015Page: e326-e327 Advertisement Copyright & Permissions© 2015 by American Urological Association Education and Research, Inc.MetricsAuthor Information Soichiro Yoshida More articles by this author Shohei Fukuda More articles by this author Toshihiro Kanda More articles by this author Naotaka Fukui More articles by this author Kazutaka Saito More articles by this author Yasuhisa Fujii More articles by this author Yukio Kageyama More articles by this author Kazunori Kihara More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...