• Title/Summary/Keyword: Compensation film

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STUDY OF MULTILAYER STRUCTURE USING X-RAY DOUBLE CRYSTAL DIFFRACTION

  • Wu, Yunzhong;Xu, Xueming;Wang, Weiyuan
    • Journal of the Korean Vacuum Society
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    • v.4 no.S2
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    • pp.30-33
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    • 1995
  • By using X-ray double crystal diffraction technique the multilayer structure composed of glass membrane, platinum film and $\alpha Al_2O_3$ substrate has been studied. It is found the stress is produced in the film by thermal mismatch within multilayer materials. The measuring results of thin film platinum resistors show that the stress were induce resistance change of device and different stress status will produce add resistance in different direction. Selecting proper glass material can make opposite stress in Pt film and opposite add resistance due to thermal mismatch. The reliability of Pt resistor has been improved with method of this stress compensation.

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Diaphragm-Type Pressure Sensor with Cu-Ni Thin Film Strain Gauges-II : Design Fabrication and Characteristics of a Pressure Sensor (Cu-Ni 박막 스트레인 게이지를 이용한 다이어프램식 압력 센서-II:압력 센서의 설계 제작의 특성)

  • 민남기;전재형;박찬원
    • Electrical & Electronic Materials
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    • v.10 no.10
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    • pp.1022-1028
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    • 1997
  • In this paper we present the construction details and output characteristics of a diaphragm-type pressure sensor with Cu-Ni(53:47) thin-film strain gauges. In order to improve the sensitivity and the temperature compensation two circumferential gauges are placed near the center of the diaphragm and two radial gauges are located near the edge. For all the gauges the relative change in resistance ΔR/R with pressure is of the order 10$^{-3}$ for the maximum pressure. The output is found to be linear over the entire pressure range(0-30kfg/cm$^2$)and the output sensitivity obtained is 1.6mV/V. The maximum nonlinearity observed in output characteristics is 0.35%FS for 5V excitation and the hysteresis is less than 0.1%FS.

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Effect of Out-of-plane Retardation of Substrate Film on the Viewing-angle Dependence of Transmittance in a Display Device

  • Ahn, Sumin;Lee, Ji-Hoon
    • Current Optics and Photonics
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    • v.5 no.1
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    • pp.45-51
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    • 2021
  • The effect of the out-of-plane retardation (Rth) of a substrate film on the viewing-angle dependence of transmittance (TR) in a display device was investigated. When the polarization state of input light deviates from the transmission axis of the polarizer, Rth of the substrate film induces inhomogeneous viewing-angle dependence of TR. The inhomogeneity of TR gets worse for greater values of of Rth. The inhomogeneous TR profile can be eliminated by inserting compensation films, which convert the input polarization state to the linear polarization state parallel to the transmission axis of the polarizer.

Optical Investigation and Defect Detection Methods in Polarizing Film on Phase Delay Plates (위상지연판 접합 편광필름의 광학적 고찰 및 결함 검출 방안)

  • Joo, Young Bok;Huh, Kyung Moo
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.4
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    • pp.55-61
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    • 2021
  • In this paper, we proposed and implemented defect detection methods of polarized film with half-wave phase retardation plates. We investigated the principles of phase retardation compensation and optical principle of half-wave phase retardation plates. We analyzed of samples of polarized film with half-wave phase retardation plates. The optical defect detection methods are proposed and the performance is validated with experiments.

Compensation for Liquid Crystal

  • Jea-Claude, Lehureau;Laure, Lee Mane Si
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.1104-1107
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    • 2003
  • Normally white TN-LCD is the preferred solution in active matrix display thanks to easy production, fast response and good white balance. However, it is has poor viewing angle properties and correction films are difficult to design. We present the mathematics of designing a compensating film and discuss various technological solutions for making

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Trend of Wide Viewing Angle Technology

  • Hong, Hyung-Ki;Shin, Hyun-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 2000.01a
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    • pp.7-8
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    • 2000
  • We compared various LCD modes for wide viewing angle. These modes can be classified as film-compensation, multi-domain, IPS. So far, IPS and multi-domain VA represent best performance. The performance gap with respect to CRT is diminishing.

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Comparison of Optical Monitoring Methods for Deposition of the Optical Thin-film Filters (광학적 두께 제어 방법에 따른 광학박막필터의 에러보상효과에 대한 비교)

  • Jeong, Seong-Gu;HwangBo, Chang-Gwon
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.07a
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    • pp.207-208
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    • 2008
  • In this study, we present the error compensation effect of optical monitoring methods for apply of narrow band pass filter and IR-cutoff filter. Then we show the optimization process for apply of optical monitoring methods.

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A Novel Transflective Homogeneously Aligned Liquid Crystal Display Driven by Fringe-Field (Fringe-Field 구동형 새로운 반투과형 수평 배향 액정 디스플레이)

  • 정태봉;이승희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.6
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    • pp.501-509
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    • 2003
  • We have designed transflective liquid crystal display(LCD) associated with in-plane switching of a LC director driven by fringe-field, unlike other LCD mode. Reflective area consists of a λ/2 compensation film and a LC cell with retardation value(dΔn) of λ/4 with their optic axes making an angle of 15$^{\circ}$ and 75$^{\circ}$ against polarizer, respectively. In the transmissive area, top and bottom polarizers are parallel each other, an LC has a dΔn of λ/2, and another λ/2 compensation film is inserted between the LC cell and bottom polarizer. With the configuration, both devices show dark state initially. When an incident light is 550nm, the device shows wide-viewing-angle characteristics such that in the reflective area the contrast ratio target than 5 exists up to 55$^{\circ}$ of polar angle in all directions and in transmissive area it exists about 100$^{\circ}$ in vortical direction and 110$^{\circ}$ in horizontal direction.

Biaxial integrated optical film for VA mode LCD's made from in-situ photopolymerised reactive mesogens.

  • Kim, Kyeong-Hyeon;Lyu, Jae-Jin;Chung, Dong-Hoon;Verrall, M.;Slaney, K.;Perrett, T.;Parri, O.;Lee, Seung-Eun;Lee, Hee-Kyu
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.773-775
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    • 2004
  • For high end, large area displays, all current LC modes require some degree of optical compensation to improve the front of screen viewing experience. Currently most optical films are laminated to the outside of the LCD cell, between the glass and polariser. In this paper we wish to show how it is possible to integrate the compensating optical film within a VA mode LCD cell. The paper will describe the process of making the biaxial film through the process of in-situ photopolymerisation of an aligned film of reactive mesogens in the cholesteric phase using polarised UV light. The film can be made on the colour filter array side of the LCD panel. In addition the process of fabricating a VA mode LCD containing this film will be described and the performance of this module will be presented

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Biaxial Integrated Optical Film for VA Mode LCD's Made from In-situ Photopolymerised Reactive Mesogens

  • Kim, Kyeong-Hyeon;Lyu, Jae-Jin;Chung, Dong-Hoon;Verrall, M;Slaney, K;Perrett, T;Parri, O;Lee, Seung-Eun;Lee, Hee-Kyu
    • Journal of Information Display
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    • v.5 no.2
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    • pp.23-26
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    • 2004
  • For high end, large area displays, all current LC modes require some degree of optical compensation to improve the front of screen viewing experience. Currently most optical films are laminated to the outside of the LCD cell, between the glass and polariser. In this paper we wish to show how it is possible to integrate the compensating optical film within a VA mode LCD cell. The paper will describe the process of making the biaxial film through the process of in-situ photopolymerisation of an aligned film of reactive mesogens in the cholesteric phase using polarised UV light. The film can be made on the colour filter array side of the LCD panel. In addition the process of fabricating a VA mode LCD containing this film will be described and the performance of this module will be presented.