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산화된 다공질 폴리실리콘 전계방출 소자의 픽셀별 구동 및 특성
유성원,김진의,최시영,You, Sung-Won,Kim, Jin-Eui,Choi, Sie-Young 대한전자공학회 2007 電子工學會論文誌-SD (Semiconductor and devices) Vol.44 No.8
본 논문에서는 산화된 다공질 폴리실리콘을 이용하여 전계 방출 소자를 제작하여, 각각의 픽셀에 따른 전기적 특성과 형광체의 발광 특성을 조사하였다. 실제 대면적 디스플레이 소자에 적용하기 위해서 PM 방식을 이용해서 소자를 픽셀별로 동작하였고, 상부금속 전극의 어레이에 따른 두께와 폭의 공정조건을 확립하였다. 산화된 다공질 폴리실리콘의 미세 구조를 분석하고, 각각의 픽셀에 따른 전계방출 특성을 조사해 보았다. 상부금속 전극의 두께와 폭에 따른 전자방출 특성을 조사해 본 결과 Ti/pt(2nm/7nm)가 가장 적절한 두께라는 것을 확인 할 수 있었고, 2.5 mm 이상 폭에서 전자방출 효율이 증가하는 모습을 확인 할 수 있었다. 각 픽셀에 따른 소자의 전기적 특성은 픽셀마다 조금씩의 차이는 있지만 거의 동일한 누설 전류와 방출 전류가 나타남을 확인할 수 있었고, 동일한 크기의 효율도 관찰할 수 있었다. 누설 전류와 방출 전류는 시간이 증가함에 따라 감소하는 모습이 나타나긴 하였으나, 모든 픽셀이 거의 동일하게 감소하였다. 각각의 픽셀에 따른 휘도는 큰 차이가 없음을 확인할 수 있었고, 20 V에서 $700cd/m^2$ 이상의 높은 휘도를 나타내었으므로 실제 디스플레이 소자로도 응용이 가능할 것이다. In this paper, we fabricated the field emitter display using oxidized porous polysilicon(OPPS). Their field emission characteristics and the brightness were investigated for each pixel. The OPPS emitter was operated to each pixel using passive matrix for application of large panel display. We set up the proper thickness and width of upper electrode. The fine structure of OPPS was analyzed and the field emission characteristics of each pixel were investigated. As a result of field emission characteristics of different upper electrode thickness and width, we confirmed that the most efficient thickness was 2nm/7nm and increased the emission efficiency over the width of 2.5 mm. Even if field emission characteristics of each pixel was a little different but we confirmed the same leakage current and emission current, emission efficiency at each pixel. The leakage current and emission current was decreased according to the time increases but all of each pixel were uniformly decreased. We confirmed that the brightness of each pixel was not different and the brightness of OPPS field emitter was 700 cd/m2 at the Vps=20 V. Accordingly, the patterned OPPS field emitter can be applied to high quality field emission display devices.
Numerical Calculation Study on Generalized Electron Emission Phenomenon
김희태,유순재 한국정보디스플레이학회 2009 Journal of information display Vol.10 No.4
There are two kinds of well-known electron emissions from metal: field and thermionic emission. For thermionic emission, electrons comeout of a metal due to the thermal energy, whereas for field emission, electrons tunnel out of a metal through the strong electric field. In this study, the most general electron emission caused by the temperature and electric field with a free electron gas model was considered. The total current density of electron emission comes from the field emission effect, where the electron energy is lower than vacuum, and from the thermionic-emission effect, where the electron energy is higher than vacuum. The total current density of electron emission is shown as a function of the temperature for a constant electric field, and as a function of the electric field for a constant temperature.
Numerical Calculation Study on the Generalized Electron Emission Phenomenon
Kim, Hee-Tae,Yu, Soon-Jae The Korean Infomation Display Society 2009 Journal of information display Vol.10 No.4
There are two kinds of well-known electron emissions from metal: field and thermionic emission. For thermionic emission, electrons come out of a metal due to the thermal energy, whereas for field emission, electrons tunnel out of a metal through the strong electric field. In this study, the most general electron emission caused by the temperature and electric field with a free electron gas model was considered. The total current density of electron emission comes from the field emission effect, where the electron energy is lower than vacuum, and from the thermionic-emission effect, where the electron energy is higher than vacuum. The total current density of electron emission is shown as a function of the temperature for a constant electric field, and as a function of the electric field for a constant temperature.
Song, Yoon-Ho,Cho, Young-Rae,Hwang, Chi-Sun,Kim, Bong-Chul,Ahn, Seong-Deok,Chung, Choong-Heui,Kim, Do-Hyung,Uhm, Hyun-Seok,Lee, Jin-Ho,Cho, Kyoung-Ik The Korean Infomation Display Society 2001 Journal of information display Vol.2 No.3
Amorphous silicon thin-film transistors (a-Si TFTs) were incorporated into Mo-tip-based triode-type field emitters and diode-type ones of carbon nanotubes for an active-matrix cathode (AMC) plate of field emission displays. Also, we developed a novel surface-treatment process for the Mo-tip fabrication, which gleatly enhanced in the stability of field emission. The field emission currents of AMC plates on glass substrate were well controlled by the gate bias of a-Si TFTs. Active-matrix field emission displays (AMFEDs) with these AMC plates were demonstrated in a vacuum chamber, showing low-voltage matrix addressing, good stability and reliability of field emission, and highly uniform light emissions from the anode plate with phosphors. The optimum design of AMFEDs including a-Si TFTs and a new light shield/focusing grid is discussed.
Triode-Type Field Emission Displays with Carbon Nanotube Emitters
You, J.H.,Lee, C.G.,Jung, J.E.,Jin, Y.W.,Jo, S.H.,Nam, J.W.,Kim, J.W.,Lee, J.S.,Jang, J.E.,Park, N.S.,Cha, J.C.,Chi, E.J.,Lee, S.J.,Cha, S.N.,Park, Y.J.,Ko, T.Y.,Choi, J.H.,Lee, S.J.,Hwang, S.Y.,Chung The Korean Infomation Display Society 2001 Journal of information display Vol.2 No.3
Carbon nanotube emitters, prepared by screen printing, have demonstrated a great potential towards low-cost, largearea field emission displays. Carbon nanotube paste, essential to the screen printing technology, was formulated to exhibit low threshold electric fields as well as an emission uniformity over a large area. Two different types of triode structures, normal gate and undergate, have been investigated, leading us to the optimal structure designing. These carbon nanotube FEDs demonstrated color separation and high brightness over 300 $cd/m^2$ at a video-speed operation of moving images. Our recent developments are discussed in details.
광대역 반도체 나노선으로 제작한 전계방출소자의 광전자기 특성
류연국 한국교통대학교 2018 한국교통대학교 논문집 Vol.53 No.-
In this study, an FED device using ZnO semiconductor nanowires was fabricated and its electrooptic properties were investigated. Au catalyst patterns were used to grow ZnO nanowire bundles in a two-dimensional array pattern into the vertical direction. The length of the ZnO nanowire was about 10 to 50 μm, and the diameter of the nanowire was in the range of 20 to 100 nm. The ZnO nanowires showed good field emission characteristics and the threshold voltage was measured at 3.6 V/μm. It is expected that the nanowire-based FED device developed through this study will present the possibility as a next generation display device.
Luminescence Enhancement by Ba in SrTiO<sub>3</sub>:Pr, Al Red Phosphor for Field Emission Displays
Won, Chang-Whan,Lee, Jong-Eun,Won, Hyung-Il,Kim, Kwang-Bok,Song, Yoon-Ho,Kang, Seung-Youl,Koo, Kyoung-Wan The Korean Ceramic Society 2006 한국세라믹학회지 Vol.43 No.11
The luminescence properties of $Sr_{1-x}Ba_xTiO_3:Pr$, Al red phosphor for Field Emission Displays (FEDs) have been investigated in powders prepared though solid-state reactions. $Sr_{1-x}Ba_xTiO_3:Pr$, Al red phosphors indicate a higher luminescent intensity, and have been found to have potential for field emission displays. The addition of Ba increased the luminescence intensity at 617 nm by up to 30%. Ba ions are effective in producing the energy transfers from host-to-activator in 4f-5d transitions.
Carbon-Nanotube Based Field-Emission Displays for Large Area and Color Applications
Choi, Won-Bong,Lee, Nae-Sung,Yi, Whi-Kun,Jin, Yong-Wan,Choi, Yong-Soo,Han, In-Taek,Jang, Hyeong-Yong,Kim, Hoonn-Young,Kang, Jung-Ho,Yun, Min-Jae,Park, Sang-Hyeun,Yu, Se-Gi,Jang, Jae-Eun,You, Jang-Hun The Korean Infomation Display Society 2000 Journal of information display Vol.1 No.1
The first 9-inch carbon nanotube based color field emission displays (FEDs) are integrated using a paste squeeze technique. The panel is composed of 576 x 242 lines with implementation of low voltage phosphors. The uniform and moving images are achieved only at $2V/{\mu}m$, This demonstrates a turning point of nanotube for large area and full color applications.
Color Tuning of Light Emitted from the Cathodoluminescence of (Ca1 − xEux)Ga2S4 Phosphors
조영식,박혜진,Eung-Dab Kim,장민경,허영덕 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.10
(Ca1-xEux)Ga2S4 (x?=?0.10, 0.40, 0.70, 1.0) phosphors were synthesized from CaS, EuS, and Ga2S3 via a solid-state reaction, and their crystal structures were investigated by X-ray diffraction analysis. Cathodoluminescence (CL) spectra of these phosphors under moderate electron-beam voltages from 4 to 10 kV were investigated to assess their applicability in carbon nanotube field-emission displays. The wavelength at maximum intensity (?max) of the CL spectra changed gradually from 557 to 546?nm with increasing europium-ion mole fraction (x) in the (Ca1-xEux)Ga2S4 phosphors. These bands were attributed to the transitions from the lowest energy level of the 4f65d1 excited state to the 4f7 (8S7/2) ground state of the Eu2+ ions. The blue shift of this wavelength was interpreted on the basis of the crystal structures of the phosphors. The color of light emitted from the (Ca1-xEux)Ga2S4 phosphors was confirmed to be tunable.
Stereoscopic three-dimensional display with a fast-response liquid crystal polarization rotator
이정영,Man-Chun Tseng,Hoi-Sing Kwok 한국정보디스플레이학회 2013 Journal of information display Vol.14 No.3
A stereoscopic three-dimensional (3D) system using a polarization rotator is proposed. The polarization rotator converts the polarizations of images from different eyes in temporal multiplexing. A novel fast nematic liquid crystal mode is also proposed. The new liquid crystal mode has a fast response time and a high contrast, and is thus a good candidate as a polarization rotator. The proposed 3D system uses only passive polarized glasses, which are more convenient, lightweight, and low-cost than what? In addition, the polarization rotator can be applied to current two-dimensional displays and can become 3D-capable displays.