• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.205-208
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• 2004

The switching mechanism of multi-domain vertical alignment mode LCD and delayed on response time phenomenon in special conditions are investigated. A modified DCC (Dynamic Capacitance Compensation), DCCII has been developed for the fast response time performance in PVA TFT-LCD TVs. DCCII applies a pre-tilt voltage to addressed pixels during the previous frame in addition to an overshoot voltage. In result, the response time less than 8 msec, has been obtained for all moving images through the DCCII technique.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.520-523
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• 2007

In this paper, we present a novel method to minimize flicker and gray scale errors automatically across the entire panel by using a compensation of the gray levels of image. It was realized by image simulation with feedback structure. As a result of simulation, we observed flickers from the simulated image. And we compensated the gray scale levels for original image. The compensated gray scale levels correspond to flickers which are generated by difference of pixel voltage in odd and even frame. And we simulated repetitively the compensated image by our block diagram for reduction flicker. Consequently, we confirmed flickers have been decreased more than 87%. Furthermore, our method provides visualization and valid prediction for improvement of TFT-LCD panel

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1886-1887
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• 2007

New high technology has been developing rapidly in telecommunication. That wanted to need a display which economical and useful color STN is satisfactory advantages for this condition, and it can control easy better than TFT, organic electroluminescence. But color STN has restriction on real time. Thus, in this paper, we want to control color STN with frequency transform method on converter.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1058-1061
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• 2004

Recently, According to companies of TFT LCD are making large sized products more and more. In the vortex of Products with a monitor and LCD TV is applied in a technique of a high viewing angle(FFS, IPS, VA). Also, as a high luminance, high speed response time, high degree of a color purity, and so on are continuing to develop a high performance, it is necessary to improve a specific character of high luminance that apply to LCD TV as a LCD BLU. Because a LCD panel for TV usually has a lower resolution that compare to a monitor, the structure of present backlight system can't put out its power even though it has a merit in transmission. Therefore, the examination of improvement about the high luminance direct typed BLU for LCD TV that presupposes several uses of CCFL(Cold Cathode Fluorescent Lamp) or EEFL(External Electrode Fluorescent Lamp)is actively being progressed. Although it is necessary to increase the number of lamps for applying high performance by the direct type, in this case, because we can design the character of luminance for adoption of high performance. We can satisfy with a level of luminance for LCD TV. Accordingly, we analyzed a change of the number of CCFL, mechanical and optical character to produce the direct typed backlight in 32inches spec. Consequently, we achieved luminance of 6597nit,which was including polarization film, and secured the standard for LCD TV.

• Korea-Australia Rheology Journal
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• v.19 no.3
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• pp.171-176
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• 2007

LCD-BLU (Liquid Crystal Display-Back Light Unit) of medium size is usually manufactured by forming numerous dots with $50{\sim}300\;{\mu}m$ in diameter by etching process and V-grove shape with $50\;{\mu}m$ in height by mechanical cutting process. However, the surface of the etched dots is very rough due to the characteristics of the etching process and V-cutting needs rather high cost. Instead of existing optical pattern made by etching and mechanical cutting, 3-dimensional continuous micro-lens of $200\;{\mu}m$ in diameter was applied in the present study. The continuous micro-lens pattern fabricated by modified LIGA with thermal reflow process was tested to this new optical design of LGP. The manufacturing process using LIGA-reflow is made up of three stages as follows: (i) the stage of lithography, (ii) the stage of thermal reflow process and (iii) the stage of electroplating. The continuous micro-lens patterned LGP was fabricated with injection molding and its test results showed the possibility of commercial use in the future.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.3
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• pp.439-444
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• 2011

In this paper, we implemented the intelligent smart monitor system for next generation which is most commonly viewed information in a vehicle from the instrument cluster, where speed, tachometer, fuel, engine temperature, fuel gauge, turn indicators and warning lights and provide the driver with an array of informations. Designed Smart HUD(Head-Up-Display) monitor system is composed TFT LCD, LCD Back light led, plane mirror, lens and controllers parts and it was assembled to intelligent integrated smart monitor system. Finally, we analyze intelligent integrated smart monitor system for driver safety vehicles and present the possibility to apply to smart intelligent HUD total monitor system for next generation.

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.920-923
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• 2003

We fabricated composite materials as a pellet structure with the various kinds of inorganic material powder. The composite materials were deposited onto the plastic film by the electron beam evaporation and water vapor transmission rates (WVTRs) were measured by the MOCON facility. As a result of WVTRs, the composite materials had lower WVTR value than any other inorganic materials. So, these films were proposed to protect the organic light emitting device (OLED) from moisture and oxygen. We can consider that the composite thin-film is one of the more suitable candidates for the thin-film passivation layer in the OLED. And, we are processing the XRD, XPS and EPMA to analyze the property of the composite material. We will also analyze properties of the current-voltage and luminescence for lifetime both the composite thin-film passivated OLED and non-passivated OLED.

• Korean Journal of Optics and Photonics
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• v.21 no.3
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• pp.97-102
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• 2010

A pattern density function using simulation analysis for controlling LGP output distribution was proposed. The pattern density function was found as [Pexp(-y/70)+Qexp(+y/25)]R. We analyzed the LGP output distribution of a hemi-sphere pattern using the function and then found that its output distribution was clearly improved as compared with that of the equi-distance pattern. We found that the density function works well for the pyramid pattern case as well as.

• Transactions of Materials Processing
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• v.20 no.1
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• pp.11-16
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• 2011

Recently, according to the rapid development of display, many display applications, such as, cellular phone, navigation, monitor and LCD TV have been changed from CRT type to LCD type. BLU(Back Light Unit) is one of main parts in LCD unit and generally, it consists of a light source, a reflective sheet, a LGP(Light Guide Plate), a diffuser sheet, and two prism sheets. The most important component of BLU is a light guide plate, which diffuses the input light to the TFT-LCD module uniformly. The LGP is usually made by injection molding process, and it has numerous optical micro patterns on the surface. In the present study the micro-patterned stamper which has cylindrical shape was fabricated by using the UV-LiGA process. And the replication characteristics have been compared among three different kinds of injection molding process; general injection molding, injection/compression molding and RHCM(Rapid Heating and Cooling Molding). Average replication ratios of CIM and ICM were 19.1% and 64.6%, respectively. On the other hand, the average replication ratio of RHCM process showed the higher value of 98.4% among these. It show that maintaining the mold surface above $T_g$ could increase the replication ratio of micro patterns substantially.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.128-128
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• 2011

Polysilicon thin-film transistors (poly-Si TFTs)는 능동행렬 액정 표시 소자(AMLCD : Active Matrix Liquid Crystal Display)와 DRAM과 같은 메모리 분야에 폭넓게 적용이 가능하기 때문에 많은 연구가 진행되고 있다. 최근 poly-Si TFTs의 우수한 특성으로 인하여 주변 driving circuits에 직접화가 가능하게 되었다. 또한 디스플레이 LCD 패널에 controller와 메모리와 같은 다 기능의 장치을 직접화 하여 비용의 절감과 소자의 소형화가 가능한 SOP (System on panels)에 연구 또한 진행 되고 있다. 이미 잘 알려진 바와 같이 비휘발성 메모리는 낮은 소비전력과 비휘발성이라는 특성 때문에 이동식 디바이스에 데이터 저장 장치로 많이 사용되고 있다. 하지만 플로팅 타입의 비휘발성 메모리는 제작공정의 문제로 인하여 SOP의 적용에 어려움을 가지고 있다. SONOS 타입의 메모리는 빠른 쓰기/지우기 효율과 긴 데이터 유지 특성을 가지고 있으나 소자의 스케일링 따른 누설전류의 증가와 10년의 데이터 보존 특성을 만족 시킬 수 가 없는 문제가 발생한다. 본 연구에서는 SOP 적용을 위하여 ELA 방법을 통하여 결정화한 poly-Si TFT memory를 SiO2/Si3N4/SiO2 Tunnel barrier와 High-k HfO2과 Al2O3을 Trapping layer와 Blocking layer로 적용, 비휘발성 메모리을 제작하여 전기적 특성을 알아보았다.