• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.1
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• pp.92-97
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• 2007

This study was carried out to minimize the lifting force and to design the slim sized frame of a height adjustment mechanism. This unit is designed for the display devices in order to enhance the ergonomics for effective height adjustment as well as to achieve much slimmer frame for the pedestal. A tolerance analysis of 6 sigma was applied to achieve smooth lift at design stage not to change the tolerance specification of gap several times in a roller type of lifting mechanism at mass production stage. The specification of minimum gap and the target of production yield ratio were agreed with a quality team before tooling. A DFSS simulation on drawings had been done with reasonable tolerance and achievable standard deviation(${\sigma}$) several times until the target specification of gap and yield ratio was met. Once tolerance and deviation(${\sigma}$) were fixed tooling start was done successfully. A CAE method was applied to achieve a slim design. Design parameters were frozen when those parameters matched the reference strength data of standard model. Through those tolerance analysis and CAE simulation the number of tool modification was reduced and production yield ratio was raised up without arguing quality specification at production stage in the end.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.981-984
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• 2005

Many flat panel displays displays rely on polymeric substrates with thin film coatings, such as anti-reflective, anti-static and hardcoats, to improve optical and mechanical properties of the display. In this paper we briefly discuss the principles underlying the mechanical robustness of such coated structures, and examine two fitness-for-use tests currently employed by the industry. We compare the teachings with some results obtained with our hardcoats and anti-reflective coatings.

• Information Display
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• v.3 no.3
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• pp.3-12
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• 2002

FPD(Flat Panel Display; 평판 디스플레이) 시스템에서의 고속 인터페이스 기술은 적용 범주에 따라 호스트 모듈과 디스플레이 모듈간의 인터페이스와 타이밍 제어기와 구동 LSI 간의 인터페이스로 구분된다 현재까지 발표된 FPD용 인터페이스 기술에는 호스트 모듈과 디스플레이 모듈간의 인터페이스 기술로서 LVDS와 TMDS가 있으며, 타이밍 제어기와 구동 LSI 간의 인터페이스로서 RSDS, Mini-LVDS, CMADS, Whisper Bus 가 있다. 본 고에서는 이러한 기술들의 특징 및 장단점에 대해 논하고, 고속 인터페이스 기술의 향후 전망 및 과제를 제시한다.

• Electrical & Electronic Materials
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• v.17 no.7
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• pp.21-29
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• 2004

절연성 기판 위에 단결정이 아닌 반도체 박막을 이용하여 만든 전계효과 (Field Effect FET) 소자로 일반적으로 정의되는 박막 트랜지스터 (Thin Film Transistor, TFT)는 1962 RCA lab.의 Weimer에 제안되어 지금까지 많은 발전을 거듭해 왔다. ［1］ TFT는 SRAM이나 ROM에도 응용되지만, 주된 사용 분야는 능동구동방식 평판 디스플레이(Active Matrix Flat Panel Display)의 화소 스위칭 소자이다. 액정 디스플레이(Liquid Crystal Display, LCD)나 유기 전계발광 디스플레이(Organic Electro-luminescence Display, OELD) 화소의 스위칭 소자로도 TFT가 널리 사용되고 있다. (중략)

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.913-918
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• 2005

It is expected that the inkjet technology offers prospect for reliable and low cost manufacturing of FPD (Flat Panel Display). This inkjet technology also offers a more simplified manufacturing process for various part of the FPD than conventional process. For example, recently the novel manufacturing processes of color filter (C/F) in LCD, or RGB patterning in OLED by inkjet printing method have been developed. This elaborates will be considered as the precious point of manufacturing process for the mass production of enlarged-display panel with a low price. On this point of view, we would like to review the status of inkjet technology in FPD, with some results on forming micro line by inkjet patterning of suspension type silver nano ink as below. We have studied the inkjet patterning of synthesized aqueous silver nano-sol on interface-controlled ITO glass substrate. Furthermore, we designed the conductive ink for direct inkjet patterning on bare ITO glass substrate. The first, the highly concentrated polymeric dispersant-assisted silver nano sol was prepared. The high concentration of batch-synthesized silver nano sol was possible to 40 wt%. At the same time the particle size of silver nanoparticles was below $10{\sim}20nm$. The second, the synthesized silver nano sol was inkjet - patterned on ITO glass substrate. The connectivity and width of fine line depended largely on the wettability of silver nano sol on ITO glass substrate, which was controlled by surfactant. The relationship was understood by wetting angle. The line of silver electrode as fine as $50{\sim}100\;{\mu}m$ was successfully formed on ITO glass substrate. The last, the direct inkjet-patternable silver nano sol on bare ITO glass substrate was designed also.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.231-236
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• 2004

The area of flat glass panel displays such as LCD (Liquid crystal display) and PDP (Plasma display panel) has been increased more than 2 $\times$ 2 m$^2$ for productivity improvement. However, such a large panel area incurs large panel deflection during panel transfer using robots or AGV (Automated guided vehicle) systems. Therefore, electronic industries are making an effort to find an alternative transfer system for the large glass panels with small deflection. The air conveyor with porous pads is one plausible solution, but it becomes expensive because the large porous pads cost much and air consumption increases as the panel area increases. In this work, a simple air slit levitating conveyor was devised to lower the equipment cost and to reduce the air consumption of system. The air flow model between the LCD glass panel and conveyor was constructed and its validity was verified by experiments. To minimize the air consumption, the conveyor dimensions were optimized, and the air consumptions between the air conveyors with the air slit and that with the porous pad were compared.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.403-405
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• 2006

Over the years, plasma display panel (PDP) manufacturers have impressed the flat panel display industry with yet another new product essentially having the merits of a larger screen size. Since larger size implies higher power ratings, voltage/current ratings of the power devices used have become a rising concern. Another important concern is the brightness of PDP, one way of increasing which is by operating the PDP at higher frequencies. In order to address the above issues, a transformer coupled sustain-driver for AC-PDP is proposed During the transition time, the two windings of the transformer greatly boost up the displacement current flowing through the panel capacitance and hence enable a fast inversion of the voltage polarity with practical values of resonant inductance. In the proposed topology, the resonant inductance can be increased by a factor of $(n+1)^2$ as compared to prior approaches. Increased inductance results in lower current stresses. Moreover, high frequency operation is possible by using higher value of n (turn ratio of the transformer). The operational principle and design procedure of the proposed circuit are presented with theoretical analysis. The validity of the proposed sustain driver is established through simulation and experimental results using a 42-in PDP

• Journal of Information Display
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• v.3 no.1
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• pp.11-16
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• 2002

This paper presents a study on the tubeless Plasma Display Panel (PDP) packaging using glass-to-glass electrostatic bonding with intermediate amorphous silicon. The bonded sample sealing the mixed gas with three species showed high strength ranging from 2.5 MPa to 4 MPa. The glass-to-glass bonding for packaging was performed at a low temperature of $180^{\circ}C$ by applying bias of 250 $V_{dc}$ in ambient of mixed gases of He-Ne(27 %)-Xe(3 %). The tubeless packaging was accomplished by bonding the support glass plate of $30mm{\times}50mm$ on the rear glass panel and the capping glass of $20mm{\times}20mm$. The 4-inch color AC-PDP with thickness of 8 mm was successfully fabricated and fully emitted as white color at a firing voltage of 190V.

• 한국경영정보학회:학술대회논문집
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• 2008.06a
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• pp.557-562
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• 2008

FPD(Flat Panel Display) 시장은 디지털 기술의 발전으로 급속하게 성장하고 있으며, 이는 TV 시장에서도 마찬가지이다. 많은 전문가들은 LCD(Liquid Crystal Display)와 PDP(Plasma Display Panel)의 기술적 차이로 인해 LCD는 소형 크기의 TV에 적합하고, PDP는 대형 TV에 적합할 것이라 예상하고, 이에 따라 FPD TV 시장에 적용되는 기술이 목표시장(target market)에 따라 양분할 것으로 전망하였다. 그러나 LCD 생산기술상의 예상치 못한 급속한 진전은 PDP가 목표로 하는 대화면 TV 시장에서 LCD가 독자적인 틈새시장을 형성하고 이를 점차 확대할 수 있도록 하였다. 이러한 시장 전개 양상은 LCD와 PDP의 경쟁을 심화시키고, 현재 앞에서 전망한 바와 같은 현상은 발견되지 않고 있으며, 오히려 대화면 TV 시장에서조차 LCD가 우위에 있음을 보여주는 사례가 많다. 본 연구에서는 LCD가 PDP와의 기술적 격차를 줄이고, 결과적으로 LCD와 PDP간 경계를 무너뜨린 보다 근원적인 원인을 분석한다. 특히 이러한 잠재적 메커니즘을 시스템 다이나믹스 방법론을 도입하여 분석한다. 특히 PDP에 대하여 점진적으로 LCD가 우위를 확보하게 되는 피드백 루프들을 밝혀 내고자 한다. 그리고 이러한 피드백 루프 중에서 가장 효과가 큰 메커니즘을 찾아낸다.

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1746-1748
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• 1997

The surface discharge type ac plasma display panel(ac PDP) is a flat display devices using gas discharge. In ac PDP, parallel electrodes covered with dielectric layer are on a substrates. The discharge current characteristics are affected by cell structure. In this study, the relationship between the principal design factor and discharge characteristics is discussed, based on experiment, and the current waveform is measured by voltage detector and storage O.S.C. as a parameter of design factor, e.g., electrode gap and width.