• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.367-369
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• 2009

Optically anisotropic rotating balls were disposed in a monolayer, and controllably closely packed with respect to one another in the monolayer. The close packed monolayer configuration provided high brightness and improved contrast. The monolayer rotating ball display (MRB) electrically demonstrated a fast response time of approximately 40 msec at a voltage of 30 V. Measurements of the rotation as a function of voltage led to surface charge density for the balls in the range of 3-4 ${\mu}C/m^2$.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2010년도 춘계학술발표대회
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• pp.20.1-20.1
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• 2010

'Electronic paper (EP)' provides desirable viewing characteristics of paper with being thin, lightweight, flexible, and recordable with minimal power consumption. Currently, a number of different technologies to realize the EP are actively competing. Here we demonstrate a newly developed monolayer rotating ball (MRB) electronic paper display where optically anisotropic rotating balls were disposed in a monolayer, and controllably closely packed with respect to one another. The close packed monolayer configuration provides high brightness and improved contrast with better electrical and optical features in comparison with the typical (Gyrion) rotating ball display. In this talk, we present characteristics of the MRB display in terms of performance, with particular emphasis on the response time as a function of the electric field.

• 한국반도체및디스플레이장비학회:학술대회논문집
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• 한국반도체및디스플레이장비학회 2004년도 춘계학술대회 발표 논문집
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• pp.169-173
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• 2004

Rotating Compensator Ellipsometry에 회전하는 시편 홀더를 갖추었을 때 uniaxial한 시편의 광축과 retardance를 측정하는 것이 매우 간단해진다. 이것은 Dual Rotating Compensator Transmission Ellipsometry의 self-calibration과정과 흡사하기 때문이다. 기존의 ellipsometry가 광학 부품들의 입사면에 대한 방위각을 찾는 복잡한 calibration과정과 비등방성 시편의 고속축의 방향을 찾아야 하는 수고를 필요로 하지만 rotating sample and compensator ellipsometry는 self-calibration과 자동으로 고속축의 방향을 찾기 때문에 매우 편리하다. 우리는 이 기술를 정렬된 액정display panel에 적용하여 ~$0.4^{\circ}$ 의 작은 retardance 간을 측정할 수 있었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.510-512
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• 2009

A volumetric 3D display system based on a rotating two dimensional color LED array is set up. It has a cylinder display space ${\Phi}800{\times}640mm3$ which is composed of 256 slices of pictures in one 3D image with each slice $320{\times}256$ LED pixels. The volumetric image has 4 gray scales and 64 colors. The main structure and working principle of the system is described in detail.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.440-441
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• 2004

A volumetric three-dimensional (3D) display system was presented, which utilizes a rotating two-dimensional (2D) display panel of light emitting diodes (LEDs) to generate more than 10 million volume pixels (voxels) within a cylindrical volume of 165 mm in height and 292 mm in diameter. Due to persistence of vision, momentarily addressed voxel information is perceived and fused into a 3D image. Important cues for depth perception, such as binocular parallax, accommodation, convergence and motion parallax are satisfied automatically and naturally, thus it is suitable for individual or group viewing, without the need for any special visual aids.

• 반도체디스플레이기술학회지
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• 제2권2호
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• pp.1-4
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• 2003

We have developed a rotating compensator spectroscopic ellipsometer (RCSE). As the ellipsometry measures a change in the polarization state of a light wave upon non-normal reflection from surface, the degree of sensitivity is enhanced greatly through the detection of relative phase change. RCSE acquires additional information from the non-ideal surface of sample and operates over the photon energy range from 1.5 to 4.5 eV. We applied RCSE to measure the optical properties of films and the line-width of patterned PR films on crystalline silicon.

• 전기전자학회논문지
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• 제19권2호
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• pp.168-175
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• 2015

본 논문은 잔상효과를 이용해서 동영상 표출이 가능한 회전형 LED 전광판을 위한 FPGA 설계 기법을 제안한다. 제안된 기법은 역감마 보정과 오차 확산 방식을 이용한 데이터 보정 과정, 블록 인터리빙 과정, 데이터 시리얼 출력 과정 등의 3가지 과정으로 구성된다. 역감마 보정과 오차 확산 방식을 이용한 데이터 보정 과정은 영상 데이터를 선형 휘도 특성으로 변환하기 위한 역감마 보정과 역감마 보정에 의해 발생하는 저계조 휘도 감소 현상을 줄이기 위해 오차 확산 방식을 이용한 영상 데이터를 보정하는 단계이다. 영상 데이터 블록 인터리빙 과정은 가로열로 입력되는 프레임의 데이터를 입력순서에 맞추어 저장한 후, 세로열에 해당하는 데이터만을 읽어내는 단계이다. 데이터 시리얼 출력 과정은 고속으로 회전하는 LED Bar에 표출해야 할 데이터를 전송하기 위해서 회전 위치에 해당하는 병렬 데이터를 시리얼로 변환하여 LED Driver IC에 전송하는 단계이다. 제안된 FPGA 설계 기법의 정확성을 평가하기 위해서 FPGA는 Xilinx 사의 Spartan 6 계열의 XC6SLX45-FG484를 사용하였고 설계 툴은 ISE 14.5를 사용하였다. 역감마 및 오차확산 보정작업에 대한 정확한 동작, 블록 메모리 인터리빙 동작, 영상 데이터의 시리얼화 동작 등에 대하여 목표로 한 설정값과 시뮬레이션 결과값이 일치함을 확인 할 수 있었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1299-1301
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• 2006

A visual display is formed by picture elements, which are optically coupled to optical pathways through which light is supplied from light sources. Light sources, controlled by control hardware, transmit light to the optical pathways by scanning light from the light sources to different optical pathways. The light sources and the optical pathways are mutually oriented so that light from the light sources can be canned to different optical pathways to form the displayed image. Light sources can be mounted to a rotating mounting that rotates past static pathways that transmit coupled light to the waveguide screen.

• 대한기계학회논문집A
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• 제32권7호
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• pp.583-589
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• 2008

For the purpose of monitoring by ultrasonic test of the ball bearing conditions in rotating machinery, a system for their diagnosis was developed. ultrasonic technique is used to detect abnormal conditions in the bearing system. And various data such as frequency spectrum, energy and amplitude of ultrasonic signals, and ultrasonic parameters were acquired during experiments with the simulated ball bearing system. Based on the above results and practical application for power plant, algorithms and judgement criteria for diagnosis system was established. Bearing diagnosis system is composed of four parts as follows : sensing part for ultrasonic sensor and preamplifier, signal processing part for measuring frequency spectrum, energy and amplitude, interface part for connecting ultrasonic signal to PC using A/D converter, graphic display and software part for display of bearing condition and for managing of diagnosis program.

• 반도체디스플레이기술학회지
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• 제3권1호
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• pp.31-34
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• 2004

We develop Mueller-matrix spectroscopic ellipsometry based on dual compensator configuration. This technique is very powerful for measuring surface anisotropy in nano-scale, especially when materials show depolarization. Dual-rotating compensator configuration is adopted with the rotational ratio of 5:3 originally developed by Collins et al[1]. The instrument can provide 250-point spectra over the wavelength range from 230 nm to 820 nm in one irradiance waveform with minimum acquisition time of Tc=10 s. In this work, the results obtained in transmission modes are presented for the initial attempt. We present calibration procedures to diagnose the system from the utilized data collected in transmission mode without sample. We expect that the instrument will have important applications in thin films and surfaces that have anisotropy and inhomogeneity.