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Light-adaptable display for the future advertising service
변춘원,양종헌,피재은,이현구,김기헌,권병화,Seong M. Cho,이정익,김용해,조경익,조성행,이승우,황치선 한국정보디스플레이학회 2016 Journal of information display Vol.17 No.4
In this paper, a new light-adaptable display (LAD) structure with minimum power consumption is proposed for the future advertising service, and the demonstrated results are reported. An organic light-emitting diode with color reflection (colored OLED) was applied for the reflective- and emissivemode device, and a guest-host liquid-crystal device (GH-LC) was adopted for the light shutter device. The current efficiency and reflectance of the colored OLED were 35.15 cd/A at 457 cd/m2 luminance and 63% for the yellow color, respectively. The measured contrast ratio of GH-LC was 15.5:1 at darkroom conditions, respectively. Transparent oxide thin-film transistors were used for the backplane, and their average mobility was 9.08 cm2/V s, with a 0.5 standard deviation. Through the optimization of the fabrication process and the structures of each device, the LAD adaptively operating according to the environmental illuminance from dark to 10,000 nits was successfully demonstrated. Moreover, a new LAD driving method was proposed for minimizing the power consumption.
초실감 AR/VR 구현을 위한 디스플레이 기술 개발 동향
변춘원,이현구,조현수,조남성,이정익,Byun, C.W.,Lee, H.K.,Cho, H.S.,Cho, N.S.,Lee, J.K. 한국전자통신연구원 2017 전자통신동향분석 Vol.32 No.6
Augmented reality/virtual reality(AR/VR) technology has a very long research history, beginning in the 1860s. As of the CES of 2016, the expectations regarding the commercialization of AR/VR technology have increased, incurring the interest of many people. AR/VR technologies will be established as a part of our everyday life, such as smartphones, by combining the breakthrough developments of displays, semiconductors, sensors, and various content development technologies. However, until recently, the results of innovative technological developments and market growth had not been reported. In this article, we analyze these trends by focusing on display technologies, and discuss future directions.
능동형 임플란터블 디바이스 기술동향: BCI 응용 중심
이성규,변춘원,김이경,박형일,Lee, S.Q.,Byun, C.W.,Kim, Y.G.,Park, H.I. 한국전자통신연구원 2017 전자통신동향분석 Vol.32 No.6
A variety of medical devices are utilized to repair or help injured body functions after accidental injury(such as a traffic accident), population aging, or disease. Such medical devices are being actively researched and developed in portable form, skin patchable type, and further, implantable form. In the future, active implantable medical devices for neuro and brain sciences are expected to be developed. Active implantable medical devices that detect brain signals and control neurology for a wider understanding of human cognition and nerve functions, and for an understanding and treatment of various diseases, are being actively pursued for future use. In this paper, the core elements of implantable devices that can be applied to neuro and brain sciences are classified into electrode technologies for bio-signal acquisition and stimulation, analog/digital circuit technologies for signal processing, human body communication technologies, wireless power transmission technologies for continuous device use, and device integration technologies to integrate them. In each chapter, the latest technology development trends for each detailed technology field are reviewed.
김혜진,변춘원,김성은,이정익,Kim, H.J.,Byun, C.W.,Kim, S.E.,Lee, J.I. 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.6
Sensory devices have been developed to help people with disabled or weakened sensory functions. Such devices play a role in collecting and transferring data for the five senses (vision, sound, smell, taste, and tactility) and also stimulating nerves. To provide brain or prosthesis devices with more sophisticated senses, hyper sensory devices with a high resolution comparable to or even better than the human system based on individual neuron cells are essential. As for data collecting components, technologies for sensors with higher resolution and sensitivity, and the conversion of algorithms from physical sensing data to human neuron signals, are needed. Converted data can be transferred to neurons that are responsible for human senses through communication with high security, and neural interfaces with high resolution. When communication deals with human data, security is the most important consideration, and intra-body communication is expected to be a candidate with high priority. To generate sophisticated human senses by modulating neurons, neural interfaces should modulate individual neurons, and therefore a high resolution compared to human neurons (~ several tens of um) with a large area covering neuron cells for human senses (~ several tens of mm) should be developed. The technological challenges for developing sensory devices with human and even beyond-human capabilities have been tackled by various research groups, the details of which are described in this paper.
윤성민,양신혁,변춘원,정순원,박상희,조두희,류민기,권오상,김병훈,황치선,조경익 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.52
We proposed and fabricated a transparent nonvolatile memory thin-film transistor (T-MTFT). The T-MTFT was composed of a ferroelectric copolymer gate insulator of poly(vinylidene fluoridetrifluoroethylene) [P(VDF-TrFE)] and an oxide semiconducting active channel of amorphous Al-Zn-Sn-O (AZTO). The fabrication procedures were so designed as to have both good transparency and high performances even at a low process temperature below 200 ℃. Consequently, the memory window with a gate voltage sweep of -10 to 10 V, the field-effect mobility in the linear region, the subthreshold swing, the on/off ratio, and the gate leakage current were obtained to be 8.6 V, 32.2 cm^2 V^(−1)·s^(−1), 0.45 V/dec, 10^8, and 10^(−12) A, respectively. Although the photo-response and the retention behaviors should be more improved and optimized, all these obtained characteristics were very promising for the future transparent electronics.
White organic light-emitting diode (OLED) microdisplay with a tandem structure
Hyunsu Cho,변춘원,Chan-Mo Kang,신진욱,Byoung-Hwa Kwon,Sukyung Choi,Nam Sung Cho,Jeong-Ik Lee,Hokwon Kim,Jeong Hwan Lee,Minseok Kim,Hyunkoo Lee 한국정보디스플레이학회 2019 Journal of information display Vol.20 No.4
Microdisplay is a key technology for realizing augmented reality (AR) and mixed reality (MR) devices, which have attracted much attention of late. Even though the operating voltage in the tandem structure is higher than that in the single structure, 2-stack tandem OLED exhibited 20,000 cd/m2 at 9 V, which is compatible with CMOS circuit driving. Due to its top-emitting geometry with a tandem structure, the OLED device with a well-controlled thickness exhibited a white spectrum with (0.26, 0.26) color coordinates. The pixel density of the fabricated microdisplay panel with a white tandem OLED was about 2350 pixels per inch, and the active area of the panel was 0.7 inch diagonally. The resolution of the panel was 1280×1024, corresponding to SXGA, and the maximal luminance was 3,000 cd/m2.
김기현,이원재,김용해,변춘원,피재은,황치선 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
기존 액정디스플레이는 액정층의 상판과 하판에 편광판이 각각 한장씩 배치되어있고, 상하판의 투과축은 서로 수직으로 배열되어 있어 전계를 인가하면 액정의 배열이 변형되어 액정셀에 입사된 빛을 투과시키거나 차단시키는 형태의 액정 디스플레이 이다. 여기서 단점으로 지적되어온 낮은 투과율을 개석하기 위한 방법으로 편광판을 대신하여 흑색 염료(Black dye)를 사용하면 투과율 증가 및 외부 시인성을 향상 시킬 수 있어 이를 적용한 스마트 윈도우 및 광 투과제어와 같은 투명 소자에 응용이 검토 되고 있다. 이에 본 발표자료에서는 흑색염료(Black dye)를 이용해 능동형 투명디스플레이를 제작하고 구동특성을 살펴보았다.