World's first large size 77‐inch transparent flexible OLED display

Park, Chan Il; Seong, Mi-Ryn; Kim, Mi Ae; Kim, Dojin; Jung, Hoon; Cho, Mingu; Lee, Sang Hoon; Lee, Hyokang; Min, Sungjoon; Kim, Jaehyeong; Kim, Minseok; Park, Jong‐Hyun; Kwon, Sung‐Hyun; Kim, Binn; Kim, Se June; Park, Weon Seo; Yang, Joon‐Young; Yoon, Soo‐Young; Kang, In‐Byeong

doi:10.1002/jsid.663

Cited by 75 publications

(31 citation statements)

References 12 publications

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“…The development of flexible light sources is one of the most rapidly evolving fields. Today, organic light emitting diodes (OLEDs) are the dominating technology for flexible light sources and have been commercialized in curved displays [5,6]. However, in comparison to the inorganic nitride light-emitting-diodes (LEDs), the OLEDs suffer from a lower luminance and poorer stability under high current and shorter lifetime, especially in the short wavelength spectral range [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Colour optimization of phosphor-converted flexible nitride nanowire white light emitting diodes

et al. 2019

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We demonstrate flexible nanowire white light-emitting-diodes (LEDs) with an optimized colour quality. The devices consist of flexible InGaN/GaN nanowire LEDs acting as pumps, capped with removable phosphor-doped polydimethylsiloxane membranes. Five different phosphors with tens of microns in grain size emitting from green to orange are investigated using both violet-blue and a bluegreen nanowire-based LED pumps. In addition, a flexible nanowire white LED with a warm white emission is demonstrated using two layers of different phosphors. Compared to the previous realizations of flexible nanowire white LEDs, these novel LEDs improve the colour rendering index from 54 to 86 and show a colour tuneable from a bluish cool white colour to natural white and finally to warm white. The flexibility tests show that the LEDs can be bent down to 1.5 cm curvature radius without significant degradation. Therefore, the replacement of the nano-phosphors used in the previous realization by relatively inexpensive micro-phosphors does not degrade the good mechanical flexibility of the white nanowire LEDs.

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Section: Introductionmentioning

confidence: 99%

Colour optimization of phosphor-converted flexible nitride nanowire white light emitting diodes

et al. 2019

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“…Another possible benefit of OLED displays is that they can be curved; allowing the display to be mounted directly onto the magnet bore liner. Recently, a transparent OLED technology [ 42 ], and a quantum dot light-emitting diode [ 43 ] have been developed and it is possible that this technique could also be applied to MRI in the future.…”

Section: Discussionmentioning

confidence: 99%

MR-compatible, 3.8 inch dual organic light-emitting diode (OLED) in-bore display for functional MRI

Yun

Hong

et al. 2018

PLoS ONE

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PurposeFunctional MRI (fMRI) is a well-established method used to investigate localised brain activation by virtue of the blood oxygen level dependent (BOLD) effect. It often relies on visual presentations using beam projectors, liquid crystal display (LCD) screens, and goggle systems. In this study, we designed an MR compatible, low-cost display unit based on organic light-emitting diodes (OLED) and demonstrated its performance.MethodsA 3.8” dual OLED module and an MIPI-to-HDMI converter board were used. The OLED module was enclosed using a shielded box to prevent noise emission from the display module and the potentially destructive absorption of high power RF from the MRI transmit pulses. The front of the OLED module was covered by a conductive, transparent mesh. Power was supplied from a non-magnetic battery. The shielding of the display was evaluated by directly measuring the electromagnetic emission with the aid of a pickup loop and a low noise amplifier, as well as by examining the signal-to-noise ratio (SNR) of phantom MRI data. The visual angle of the display was calculated and compared to standard solutions. As a proof of concept of the OLED display for fMRI, a healthy volunteer was presented with a visual block paradigm.ResultsThe OLED unit was successfully installed inside a 3 T MRI scanner bore. Operation of the OLED unit did not degrade the SNR of the phantom images. The fMRI data suggest that visual stimulation can be effectively delivered to subjects with the proposed OLED unit without any significant interference between the MRI acquisitions and the display module itself.DiscussionWe have constructed and evaluated the MR compatible, dual OLED display for fMRI studies. The proposed OLED display provides the benefits of high resolution, wide visual angle, and high contrast video images during fMRI exams.

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“…Third, after completing the spin-coating process, a curing process is performed for imidization of the PI solution. Since PI characteristics can be affected by curing process conditions, the process was performed under optimized conditions [19]. In this study, the PI-coated substrate was pre-baked at a temperature of 100 • C for 30 min, cured at 200 • C for 8 min and then cured at 350 • C for 20 min.…”

Section: Methodsmentioning

confidence: 99%

Xenon Flash Lamp Lift-Off Technology without Laser for Flexible Electronics

et al. 2020

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This study experimentally investigated process mechanisms and characteristics of newly developed xenon flash lamp lift-off (XF-LO) technology, a novel thin film lift-off method using a light to heat conversion layer (LTHC) and a xenon flash lamp (XFL). XF-LO technology was used to lift-off polyimide (PI) films of 8.68–19.6 μm thickness. When XFL energy irradiated to the LTHC was 2.61 J/cm2, the PI film was completely released from the carrier substrate. However, as the energy intensity of the XFL increased, it became increasingly difficult to completely release the PI film from the carrier substrate. Using thermal gravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR) and transmittance analysis, the process mechanism of XF-LO technology was investigated. Thermal durability of the PI film was found to deteriorate with increasing XFL energy intensity, resulting in structural deformation and increased roughness of the PI film surface. The optimum energy intensity of 2.61 J/cm2 or less was found to be effective for performing XF-LO technology. This study provides an attractive method for manufacturing flexible electronic boards outside the framework of existing laser lift-off (LLO) technology.

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World's first large size 77‐inch transparent flexible OLED display

Cited by 75 publications

References 12 publications

Colour optimization of phosphor-converted flexible nitride nanowire white light emitting diodes

Colour optimization of phosphor-converted flexible nitride nanowire white light emitting diodes

MR-compatible, 3.8 inch dual organic light-emitting diode (OLED) in-bore display for functional MRI

Xenon Flash Lamp Lift-Off Technology without Laser for Flexible Electronics

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