• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.11a
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• pp.132-135
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• 2003

핸드폰에 장착된 반투과형 LCD (Liquid Crystal Display) 패널에서 반사판을 제거하면 투과형 LCD 마스크로 이용할 수 있다. LCD 패널의 광 흡수 실험에서 얻은 스펙트럼을 참고하여 다양한 파장대의 광원으로 리소그래피 하였다. 컴퓨터 이미지 프로그램으로 편집한 그림을 핸드폰 전용 통신 케이블을 통하여 LCD 패널로 전송하여, 다양한 모양의 패턴을 기판위에 전사하는데 성공하였다. 픽셀간의 경계가 현상되어 끊어지는 패턴이 형성되는 LCD 마스크의 단점을 극복하여 연속적인 패턴결과를 얻는데도 성공하였다. 이로부터 프로젝션 리소그래피의 응용에 쉽게 접근할 수 있는 발판이 마련된 것으로 생각된다.

• Journal of KIISE:Software and Applications
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• v.34 no.5
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• pp.447-454
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• 2007

TFT-LCD(Thin Film transistor liquid crystal display) has become actively used front panel display technology with increasing market. Intrinsically there is region of non uniformity with low contrast that to human eye is perceived as defect. As the gray level difference between the defect and the background is hardly distinguishable, conventional thresholding and edge detection techniques cannot be applied to detect the defect. Between the patterned and un-patterned LCD defects, this paper deals with un-patterned LCD defects by using independent component analysis, adaptive thresholding and skewness. Our method showed strong results even on noised LCD images and worked successfully on the manufacturing line.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.600-603
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• 2008

In this paper, a new circuit design named memory-in-pixel for low power consumption of the liquid crystal display (LCD) is presented. Since each pixel has a memory, it is able to express 8 color grades using the data saved in the memory without the operation of the gate and source driver ICs so that it can reduce the power consumption of the LCD panel. A memory circuit consists of modified S-R flip-flop (NAND-type) implemented in the pixel, which can supply AC bias for operating the liquid crystal (LC) with the interlocking clocks (CLK_A and CLK_B). This circuit is more complex than the inverter-type memory circuit, but it has lower power consumption of approximately 50% than the circuit. We have investigated the power consumption both NAND and inverter-type memory circuit using a Smart SPICE for the resolution of $96{\times}128$. The estimated power consumption of the inverter-type memory was about 0.037mW. On the other hand, the NAND-type memory showed power consumption of about 0.007mW.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.673-675
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• 2004

컴퓨터 시스템의 구성 요소인 디스플레이 시스템은 가장 많은 전력을 소모하는 장치이다. 디스플레이 시스템의 전력을 효과적으로 줄이기 위하여 이미지 제어, 주파수 제어 등이 있지만 가장 효과적인 것은 LCD 패널부와 백라이트(backlight)를 제어하는 것이다. 본 논문에서는 디스플레이 시스템에서 DDC(Display Data Channel)를 이용하여 패널과 백 라이트 전압 레벨을 조절하여 저전력을 구현하였다. 호스트(PC)에서 동작하는 응용프로그램의 작성과 호스트의 영령을 받아 처리할 수 있는 디스플레이부를 구현하였다. 데스크탑 컴퓨터와 15, 17인치 LCD(Liquid Crystal Display) 모니터에서 소비 전력을 측정하였으며, 2-86%정도의 소비 전력을 줄이는 결과를 확인하였다.

• Journal of the Korean Magnetics Society
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• v.22 no.3
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• pp.91-96
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• 2012

In this paper, a three-dimensional finite element model based on the multi-pixel was constructed to accurately predict electric field distributions including an interference phenomenon between adjacent pixels in the liquid crystal of a complicated TFT-LCD panel. Utilizing the elaborate numerical model, the characteristics of spatial electric field distributions depending on various fault-electrode conditions are thoroughly examined on the basis of the field distribution of a normal electrode condition. The validity of the proposed model is proved by comparing the simulation results with those of the existing optical inspection equipments.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3429-3434
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• 2014

In the TFT-LCD(Thin Film Transistor-Liquid Crystal Display) panel manufacturing industry, SAMSUNG, a late entry, can catch up to leading first mover, SHARP. The changes the note, monitor, TV, and mobile markets in the TFT-LCD industry were studied using a system analysis method. In addition, the fast response time technology in SAMSUNG TFT-LCD technology was developed using the TRIZ method. For example, a new liquid crystal mixture of a wide view angle and fast response time were developed by doping a new high birefringence liquid crystal material in a base mixture using the contradiction method and su-field method of TRIZ. The response time of a new liquid crystal mixture was improved to approximately 60%(16.2ms with base LC mixture, 9.8ms with a new LC mixture).

• Journal of the Korea Society of Computer and Information
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• v.12 no.4
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• pp.249-256
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• 2007

AIn this paper, a new desist of LDI controller IC for general purpose is proposed for driving the LDI(LCD Driver Interface) controller in $4{\sim}9$ inches sized portable small-medium TFT-LCD(Thin Film Transistor addressed -Liquid Crystal Display) panel module. The designed LDI controller was verified on the FPGA(Reld Programmable Gate Array) test board, and was made the interactive operation with the commercial TFT-LCD panel successfully. The purpose of design is that it is standardized the LDI controller's operation by one LDI controller for driving all TFT-LCD panel without classifying the panel vendor, and size. The main advantage for new general-purpose LDI controller is the usage for the desist of all panel's SoG(System on a Glass) module because of the design for the standard operation. And in the previous method, it used each LDI controller for every LCD vendor, and panel size, but because a new one can drive all portable small-medium sized panel, it results in reduction of LDI controller supply price, and manufacturing cost of AV(Audio Video) board and panel. In the near future, the development of SoG IC(Integrated Circuit) for manufacturing more excellent functional TFT-LCD panel module is necessary. As a result of this research, the TFT-LCD panel can make more small size, and light weight, and it results in an upturn of domestic company's share in the world market. With the suggested theory in this paper, it expects to be made use of a basic data for developing and manufacturing for the SoG chip of TFT-LCD panel module.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.514-516
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• 2003

LCD(Liquid Crystal Display)는 자체 발광능력이 없으므로 그 후면에서 LCD 화면을 밝혀주는 BLU(Backlight Unit)를 필요로 한다. BLU의 핵심부품으로써 광원으로부터 나온 빛을 LCD의 패널 방향으로 이끌어내는 역할을 담당하고 있는 부분이 바로 도광판이고, 빛을 패널 방향으로 고르게 분포시키기 위해 도광판 하부에 점 모양의 확산물질을 인쇄한다. 이 인쇄패턴은 광원으로부터의 거리에 따라서 그 크기를 다르게 함으로써 패널 부분으로 균일한 평면광을 생성하도록 한다. 따라서 보다 균일한 평면광을 생성하는 BLU를 개발하기 위해서는 주어진 조건에서 패널 부분으로 균일한 평면광을 생성하도록 설계된 인쇄패턴을 찾는 것이 관건이다. 이러한 인쇄패턴을 Simplex Search 알고리즘을 사용하여 자동으로 찾게 함으로써 수작업으로 찾는 것보다 빠른 시간 내에 더욱 효율적인 인쇄패턴을 찾도록 한다.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.12
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• pp.76-81
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• 2000

Analysis on failure of the panel glass under mechanical shock is the main topic of this study. Since the glass for the LCD panel is thin, it needs to be designed to have enough toughness against mechanical shock. In this paper, a process of estimating fracture of the panel glass is proposed to guarantee reliability of the product. The fracture toughness of the panel glass is used as a criterion of the fracture based on an experimental approach. The stress intensity factor was calculated considering a model with the largest initial crack size on a cut surface and with the boundary force obtained from a dynamic finite element analysis. Critical surface roughness on the cut surface of a typical glass panel, to prevent fracture in case of bending mode, is obtained.

• Applied Chemistry for Engineering
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• v.28 no.5
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• pp.521-528
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• 2017

To find a recycling method for waste liquid crystal display (LCD) panel glasses, we investigated the synthesis process of zeolite with an ion exchange ability by hydrothermal reaction using waste LCD panel glass as a raw material. It was shown that the waste LCD panel glass can be used as a raw material for the production of zeolites having the ion exchange ability. Following conditions for the synthesis of the zeolite with an ion exchange ability were required : the molar ratio of Si to Al components of the waste LCD glass needs to be 2.0 to 2.8, and the temperature of $100^{\circ}C$ and reaction time of 12 hours are needed for the hydrothermal reaction. Based on the required conditions previously mentioned, the A type zeolite was synthesized when the molar ratio of the Si to Al component was 2.0, and the P type zeolite was produced when the molar ratio was 2.8. The type A zeolite synthesized by using the waste LCD panel glass showed a good ion exchange ability and heavy metal adsorption ability. Also, an excellent ion exchange capacity was observed as the crystal phase grows stably in a cubic phase.