• 산업공학
• /
• 제11권2호
• /
• pp.107-117
• /
• 1998

This paper presents a useful method of registration in manufacturing of shadow color mask for cathode ray tubes of the FTM (Flat Tension Mask) type, wherein the shadow mask and front panel are interchangeable when mask-panels are assembled, which is called ICM system. Theoretical analysis and alignment process are presented. The pattern of mask aperture is registered with a screen pattern of corresponding geometry of the panel in flat tension mask tube. Registration accuracy of panel and mask affects the purity of color cathode ray tube concerned with mislanding. It tries to minimize the misregistration caused by variances, which are mechanical error, mask stretching position error, restrictive number of fiducial point, etc.

• 대한기계학회논문집A
• /
• 제25권12호
• /
• pp.1988-1994
• /
• 2001

The CRT(Cathode-ray Tube) of salvage is a process of separating the panel and funnel to recycle a cathode-ray tube. In this paper, the thermal properties of glass for CRT were studied to improve its recycling ratio. In the salvage process, several patterns of breakage, as called 'comer pull', were easily generated on the sealing surface of panel or funnel glass due to the residual tensile stress, which had correlations with some parameters of the manufacturing process of CRT and the initial material properties of glass. Finite element analyses and experimental approaches on the flit sealing process were carried out to obtain the major characteristic of glass related to the residual stress. From this study, it was identified that the thermal expansion coefficient of glass had much influence on the residual stress of panel glass after frit sealing process. Therefore, the optimal conditions of thermal properties for CRT glass were proposed to achieve an effective salvage process. By using these optimal conditions, the size of comer pull on the panel and funnel glass was reduced to 10% level compared with the original size, and the recycling ratio of CRT was increased in the salvage process.

• 대한인간공학회지
• /
• 제22권3호
• /
• pp.27-44
• /
• 2003

An experiment was carried out to compare the suitability in visual tasks between flat and conventional (convex) cathode-ray tube (CRT) displays. The subjects performed visual search tasks during 2-h for detecting target words among distracters presented on the screen. The subjects' visual performance was evaluated with average time and number of errors made to complete the tasks. Visual fatigue after the search tasks was also evaluated in terms of degradations in accommodative power and subjective ratings. Difference was not found in task time between the two displays, but flat CRT showed a lower number of errors than conventional CRT. The difference in number of errors was statistically significant at 0=0.05. Although there was no difference between the displays in degradations of accommodative power, results from the subjective ratings showed that flat CRT yields less fatigue than conventional CRT. The results partially support the hypothesis that panel convexity of CRT displays has a significant effect on the performance and fatigue during visual tasks and thus flat CRT is the better display than conventional one.

• 한국가구학회지
• /
• 제19권1호
• /
• pp.22-32
• /
• 2008

Revolution of software and hardware technology changed TV from cathode-ray tube to a LCD or PDP. And this change calls for change of TV decoration cabinet. The flat panel TV stands market is very a world-wide enormous size with the function which is various and breed and design is forming. Nonetheless, Our flat panel TV stands production method and technique is to a phase which imitates the product of the foreign nation which precedes. Currently our country TV / AV decoration cabinet is staying to only the acceptance function which is simple. Consequently, the development of the new flat panel TV stands that matches in the house culture which is modernized with applies the visual effect which is various, effective design and function is necessary. The fact that it develops the product which equips the function characteristic which is new and convenient is objective of sample planning.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1998년도 추계종합학술대회 논문집
• /
• pp.457-460
• /
• 1998

Recently, the research of the FPD(Flat Panel Display)which is substituted for CRT(Cathode Ray Tube) has been widely progressed. But most equipment that are used for production of FPD are expensive and we must import these equipment. Among these equipment, most important one is a auto-alignment system. In this paper, we present a high speed, high precision auto-alignment system, in which a PLD auto tuning algorithm, 1-dimensional CCD(Dcharge Coupled Device) camera, vision board, and vision data processing algorithm are included.

• 한국의학물리학회:학술대회논문집
• /
• 한국의학물리학회 2002년도 Proceedings
• /
• pp.324-327
• /
• 2002

For a next generation PET that realizes high sensitivity and high resolution, we proposed a design of a depth of interaction detector. A unit of the detector is constructed of four stages rectangular blocks of 2 by 2 Gd$_2$SiO$\sub$5/: Ce (GSO) crystal array optically coupled to position sensitive photomultiplier tube (PS-PMT). The 256ch flat panel PS-PMT is under development by Hamamatsu Photonics K.K., JAPAN. It has large cathode area, 51.7 by 51.7 mm$^2$, and the ratio of the effective area to external size is about 90%. The feature will contribute high packing fraction, accordingly high sensitivity. The 256 anodes are arranged in 16 by 16 at intervals of 3.0 mm. So as to evaluate the detector capability for identifying crystal of interaction, we got positioning image histograms with coupling a 16 by 5 array of GSO crystals, 2.9 by 2.9 by 7.5 mm$^3$, to the PS-PMT by irradiating a gamma ray uniformly from a point source. Flat panel PS-PMT is a new promising device for PET. We need to evaluate it if its performance is sufficiency. The performance was compared to the one with a 16ch PS-PMT.

• 경영과정보연구
• /
• 제37권2호
• /
• pp.63-85
• /
• 2018

CRT(Cathode Ray Tube)가 디스플레이 산업에서 지배적 디자인으로 출현한 이후, 현재 평판 디스플레이 산업의 지배적 디자인인 LCD(Liquid Crystal Display) 디스플레이는 차세대 디스플레이로 되기 위하여 유망한 디스플레이 기술들과 경쟁 중이다. ICT 제품들에 장착되는 디스플레이는 기술 변화, 혁신적인 특성, 경쟁 역학 등과 같은 ICT 산업의 대표적인 특징들을 나타내며, 다양한 ICT 기기들에 부착되어 산업과 시장을 지배하기 위하여 기술적으로 진화하고 있다. 본 연구는 기술, 조직, 환경 차원에서 기술집약적인 ICT 산업의 지배성에 영향을 미치는 결정요인들을 확인하여 지배적 디자인의 출현을 통합적 관점에서 분석하였다. 이를 위해 선행 연구를 토대로 ICT 산업의 특징을 반영한 지배적 디자인의 개념적 특성과 결정요인의 통합적 프레임워크를 제시하고, 평판 디스플레이 기술경쟁 사례를 본 프레임워크에 적용하였다. 분석 결과, 평판 디스플레이 산업에서는 기술적 특성과 시장 수용을 토대로 유망한 기술이 기술경쟁을 통하여 산업 내 지배적 위치에 오르게 되고, 산업수준을 포함한 다양한 환경적 요인들에 의해 해당 산업과 시장을 점유하며, 지배적 위치를 유지하게 된다. 본 연구결과는 지배적 디자인에 관한 연구에서 본원적 기술간 차이와 기술혁신 속도의 중요성을 제시함으로써 지배적 디자인의 출현에 영향을 미치는 결정요인 중 기술적 요인의 중요성에 대한 이해를 확장할 뿐만 아니라 디스플레이 산업을 비롯한 ICT 산업 내 기업들의 경쟁 전략과 전략적인 지침을 수립할 수 있는 현실적인 시사점을 제공할 것으로 기대된다.

• 한국정보시스템학회지:정보시스템연구
• /
• 제17권4호
• /
• pp.301-319
• /
• 2008

The display market has been replaced by the FPD (Flat Panel Display) from the CRT (Cathode-Ray Tube) since the late 1990s. In the FPD production line, the most equipment has high price. Thus, when the equipment has multi-function, the repetitive process is arranged for the equipment. However, such disposition of equipment results in more complicated process flow owing to repetitive operations. This reduces the production capacity and increases lead-time in turn. In this paper, we develop an AutoMod simulation system that derives to information about the quantity, production lead-time, utilities of facilities, and occupation rates of racks. In this simulation system, we consider the situation where the equipment might be broken and suspended randomly. For the developed system, we first evaluate a production plan with current layout and then, propose a revised alternative plan. Using the same simulation scheme, we investigate comparing the production quantity and lead-time with the two plans. In addition, for a proposed alternative, we try to forecast the most adequate rule between the two job dispatching rules which are FOR (Fewest Operation Remaining) and FCFS (First Come First Serve) through simulation.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2004년도 춘계학술발표대회
• /
• pp.797-800
• /
• 2004

FED(Field Emission Display)는 CRT(Cathode Ray Tube)의 화질과 LCD(Liquid Crystal Display)와 같은 FPD(Flat Panel Display)의 경량, 박형의 장점을 만족시키는 차세대 Display 소자로서 주목을 받고 있다. 본 논문은 저항열을 이용하여 256 Gray-Scale Level을 출력하는 8 비트 FED Data Driver IC 설계에 관한 것이다. 즉, 저항열과 D/A 변환기를 통하여 디지털 입력 데이터에 따른 아날로그 출력 데이터를 갖는 FED 용 Data Driver IC이다. 본 논문에서 설계된 Driver IC는 집적도를 높여 Output Channel 수를 증가시키는 것을 목표로, 하이닉스 0.6um High Voltage 공정을 사용하였으며, 8 비트 RGB 데이터 입력과 40V 구동전압에서 동작하도록 설계하였다.

• 전자통신동향분석
• /
• 제34권2호
• /
• pp.10-18
• /
• 2019

Since the introduction of CRT(Cathode Ray Tube) in the 1950s, display technologies have been developed continuously. Flat panel displays such as PDP(Plasma Display Panel) and LCD(Liquid Crystal Display) were commercialized in the late 1990s, and OLED(Organic Light Emitting Diodes) and Micro-LED(Micro-Light Emitting Diodes) are now being developed and are becoming widespread. In the future, we expect to develop ultra-realistic, flexible, embedded sensor displays. Ultra-realistic display can be applied to AR/VR(Augmented Reality/Virtual Reality) devices and spatial light modulators for holography. The sensor-embedded display can be applied to robots; electronic skin; and security devices, including iris recognition sensors, fingerprint recognition sensors, and tactile sensors. AR/VR technology must be developed to meet technical requirements such as viewing angle, resolution, and refresh rate. Holography requires optical modulation technology that can significantly improve resolution, viewing angle, and modulation method to enable wide-view and high-quality hologram stereoscopic images. For electronic skin, stable mass production technology, large-area arrays, and system integration technologies should be developed.