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39 results on '"Ahn, Dae Hyun"'

5. Exploration of OLED structures for high-resolution microdisplays with enhanced efficiency and color gamut.

Author

Cho, Hyunsu, Kang, Chan-mo, Choi, Sukyung, Joo, Chul Woong, Kwon, Byoung-Hwa, Shin, Jin-Wook, Kim, Kukjoo, Ahn, Dae Hyun, and Cho, Nam Sung

Subjects
LIGHT filters, LIGHT emitting diodes, COLOR, ORGANIC light emitting diodes, PHOTOLITHOGRAPHY
Abstract

The subpixel size of high-resolution organic light-emitting diode (OLED) microdisplays measures a few micrometers. To achieve a full-color microdisplay, the current preference is to use photolithography technology on a white OLED instead of using a fine metal mask for patterning. The application of photolithography techniques allows for the creation of microcavity structures or color filters (CFs) to enhance color purity in each emitted color. This paper focuses on investigating specialized OLED device structures for high-resolution microdisplays. The characteristics of each structure, including efficiency and color gamut, are thoroughly discussed. The structure, combining microcavity and CF, achieves the widest color gamut, while microcavity structures show higher efficiency compared to CF-only structures. Tandem structures are also considered for improved efficiency and stability. [ABSTRACT FROM AUTHOR]

Published
2024
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6. White‐Color Generation Using Blue Top‐Emission Organic Light‐Emitting Diode and Nanocrystalline Materials.

Author

Moon, Jaehyun, Lee, Ju-Hun, Park, Jusun, Joo, Chul Woong, Ahn, Dae-Hyun, Kim, Joo Yeon, Woo, Ju Young, and Kang, Seung-Youl

Subjects
LIGHT emitting diodes, ORGANIC light emitting diodes, COLOR temperature, NANOCRYSTALS, PEROVSKITE
Abstract

White light is of great technical interest in many photonic applications. In this work, colloidal solutions containing mutually immiscible green perovskite nanocrystals and red InP quantum dots are developed as color‐conversion (CC) materials for generating white light. By combining the green/red CC materials and a blue top‐emission organic light‐emitting diode as an excitation source, it is possible to generate white light with a range of color temperatures (CTs). The technical approach can be extended to a wide variety of photonic applications where controllable CT is desirable. [ABSTRACT FROM AUTHOR]

Published
2024
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7. 95‐3: Fabrication of Sub‐Micron Organic/Inorganic Hybrid Thin‐Film Encapsulation on Ultra‐High‐Resolution Microdisplays Using Inkjet Printing Process.

Author

Kim, Dasol, Joo, Chul Woong, Shin, Jin-Wook, Cho, Hyunsu, Kang, Chan-mo, Choi, Sukyung, Ahn, Dae Hyun, Byun, Chun won, Cho, Nam Sung, Kim, Kukjoo, Baek, In-Bok, Suh, Hyungwoo, Woo, Seung Wan, Lee, Jonghee, and Kwon, Byoung-Hwa

Subjects
SURFACE preparation, SUBSTRATES (Materials science), THIN films, OPTICAL properties, HUMIDITY
Abstract

In this study, we fabricated sub‐micron organic/inorganic hybrid TFE (Thin Film Encapsulation). We utilize an inkjet printing process to fabricate organic layer. It has excellent industrial applicability by using an industrial printhead with 1024 nozzles. The thickness of the organic layer is optimized through the DPI (Drops Per Inch) of inkjet printing and surface treatment of substrate. The sub‐micron organic/inorganic hybrid TFE was fabricated on a TEOLED (Top Emission Organic Light Emitting Diode), and the OLED (Organic Light Emitting Diode) with the fabricated TFE did not show degradation. Under constant temperature and humidity conditions 30°C, 90 % R.H. (Relative Humidity), the luminance of the OLED remained the same without any defects. The fabricated TFE for the production of OLEDoS has excellent encapsulation properties even at a thin thickness. Finally, we are investigating the optical properties of the ultra‐high‐resolution microdisplay panel applied with the sub‐micron organic/inorganic hybrid TFE. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Organic light-emitting diode (OLED) frontplanes for high-resolution microdisplay with high color gamut (Conference Presentation)

Author

Cho, Hyunsu, primary, Kang, Chan-mo, additional, Shin, Jin-Wook, additional, Choi, Sukyung, additional, Joo, Chul Woong, additional, Kwon, Byoung-Hwa, additional, Kim, Kukjoo, additional, Ahn, Dae Hyun, additional, Kim, Gi Heon, additional, Byun, Chun-Won, additional, Cho, Nam Sung, additional, Lee, Jeong-Ik, additional, Sim, Soobin, additional, Ryu, Jinha, additional, Lee, Hyunkoo, additional, Youn, Hyoc Min, additional, An, Young Jae, additional, and Kim, Jin Sun, additional

Published
2023
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14. Efficient Quantum Dot Color Conversion Layer with Mixed Spherical/Rod-Shaped Scattering Particles

Author

Park, Hyunji, primary, Hahm, Donghyo, additional, Cho, Hyunsu, additional, Shin, Jin-Wook, additional, Kang, Chan-mo, additional, Ahn, Dae-Hyun, additional, Joo, Chul Woong, additional, Kwon, Byoung-Hwa, additional, Kim, Kukjoo, additional, Kim, Joo Yeon, additional, Jeong, Byeong Guk, additional, Cho, Nam Sung, additional, Bae, Wan Ki, additional, Lee, Jonghee, additional, and Choi, Sukyung, additional

Published
2023
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15. Environmentally Stable Luminescent Perovskite Nanocrystal Passivated and Encapsulated by Siloxane Hybrids Enabling Color-Converted Organic Light-Emitting Diodes

Author

Shin, Yongmin, primary, Suh, Hyungwoo, additional, Kwon, Byoung-Hwa, additional, Park, Joonho, additional, Cho, Hyunsu, additional, Joo, Chul Woong, additional, Choi, Sukyung, additional, Shin, Jin-Wook, additional, Kang, Chan-mo, additional, Ahn, Dae Hyun, additional, Lee, Won Jun, additional, Kim, Yong-Hoon, additional, Jang, Junho, additional, and Bae, Byeong-Soo, additional

Published
2023
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16. Color gamut change by optical crosstalk in high-resolution organic light-emitting diode microdisplays

Author

Sim, Soobin, primary, Ryu, Jinha, additional, Ahn, Dae Hyun, additional, Cho, Hyunsu, additional, Kang, Chan-mo, additional, Shin, Jin-Wook, additional, Joo, Chul Woong, additional, Kim, Gi Heon, additional, Byun, Chun-Won, additional, Cho, Nam Sung, additional, Youn, Hyoc Min, additional, An, Young Jae, additional, Kim, Jin Sun, additional, Jung, Hanyung, additional, and Lee, Hyunkoo, additional

Published
2022
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17. 59‐2: Invited Paper: High‐Color‐Gamut Organic Light‐Emitting Diode Microdisplay for Augmented‐Reality/Virtual‐Reality Devices

Author

Ahn, Dae Hyun, primary, Shin, Jin-Wook, additional, Kim, Kukjoo, additional, Joo, Chul Woong, additional, Cho, Hyunsu, additional, Choi, Sukyung, additional, Kwon, Byoung-Hwa, additional, Kim, Gi Heon, additional, Byun, Chun-Won, additional, Cho, Nam Sung, additional, Lee, Jeong-Ik, additional, Sim, Soobin, additional, Ryu, Jinha, additional, Lee, Hyunkoo, additional, Youn, Hyoc Min, additional, An, Young Jae, additional, Kim, Jin Sun, additional, Lee, Jeong Hwan, additional, Kim, Hokwon, additional, Kim, Minseok, additional, and Kang, Chan-mo, additional

Published
2022
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18. Supplementary document for Color gamut change by optical crosstalk in high-resolution organic light-emitting diode microdisplays - 5875638.pdf

Author

Sim, Soobin, Ryu, Jinha, Ahn, Dae Hyun, Cho, Hyunsu, Kang, Chan-mo, Shin, Jin-Wook, Joo, Chul Woong, Kim, Gi Heon, Byun, Chun-Won, and Cho, Nam Sung

Subjects
Physics::Space Physics, Computer Science::Information Theory
Abstract

Measured and simulated EL spectra, simulated color gamut, angular EL, reflectance, and transmittance spectra of white tandem OLED, Measured and calculated transmittance of R, G, B color filters

Published
2022
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26. 59‐2: Invited Paper:High‐Color‐Gamut Organic Light‐Emitting Diode Microdisplay for Augmented‐Reality/Virtual‐Reality Devices

Author

Ahn, Dae Hyun, Shin, Jin-Wook, Kim, Kukjoo, Joo, Chul Woong, Cho, Hyunsu, Choi, Sukyung, Kwon, Byoung-Hwa, Kim, Gi Heon, Byun, Chun-Won, Cho, Nam Sung, Lee, Jeong-Ik, Sim, Soobin, Ryu, Jinha, Lee, Hyunkoo, Youn, Hyoc Min, An, Young Jae, Kim, Jin Sun, Lee, Jeong Hwan, Kim, Hokwon, Kim, Minseok, and Kang, Chan-mo

Abstract

In this paper, we developed high color gamut OLED microdisplay. To minimize the crosstalk, a single stack white OLED structure with RGB main peaks was adopted, and RGB color filters were directly patterned on the OLED. In addition, we designed the optical crosstalk prediction model, which could predict the light loss according to the thickness of the passivation layer. As a result, we achieved high color gamut of 125.0% at sRGB, which demonstrated the high color gamut OLED microdisplay.

Published
2022
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39. Highly Efficient and Angular Stable White Organic Light-Emitting Diodes for Display Applications Based on Fluorescent Blue and Phosphorescent Yellow Emission.

Author

Ahn, Dae Hyun, Springer, Ramon, Kang, Byoung Yeop, Chin, Byung Doo, and Kwon, Jang Hyuk

Subjects
ORGANIC light emitting diodes, PHOSPHORESCENCE, QUANTUM efficiency
Abstract

Two 3-stack tandem white OLEDs devices with blue-yellow-blue and blue-blue-yellow structures with fluorescent blue and yellow phosphorescent materials were investigated about various performances for display applications. We report CIE coordinates of (0.335, 0.313) and 23.6 % EQE (external quantum efficiency) at 1000 cd/m2 in blue-blue-yellow structure. [ABSTRACT FROM AUTHOR]

Published
2016
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