• Title/Summary/Keyword: Transmittance

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Enhancement of Transmittance Efficiency of TFT-LCD using High Transmittance Polarizer and Dielectric Anisotropy Liquid Crystal

  • Lim, Sung-Hoon;Son, Dong-Yeon;Choi, Kyung-Seob;Choi, Jae-Ho;Lee, Jong-Hwan;Choi, Kwang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.661-663
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    • 2009
  • This paper describes a fabrication method for high transmittance panel using newly designed polarizer and liquid crystal with a high dielectric anisotropy (${\Delta}{\varepsilon}$). To enhance the transmittance of the panel without contrast ratio reduction, new polarizer with high transmittance and high ${\Delta}{\varepsilon}$ liquid crystal were used. The transmittance of the liquid crystal display (LCD) panel employed by a new polarizer was increased by 6% over that of the panel with a conventional polarizer and liquid crystal in LCD industry.

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Selection to the Optimal Windows Transmittance of Office Building on Sky Conditions (천공상태에 따른 오피스 창호의 적정 투과율 선정)

  • 임오연;김병수
    • Korean Institute of Interior Design Journal
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    • no.38
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    • pp.225-232
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    • 2003
  • The purpose of this study is to select the optimal and minimum transmittance for visual amenity in office buildings. This study progressed as follows. The first, we select 5 films with various transmittance based on the current film makers whose films being used on the windows of office building nowadays and the case study of construction. And then we choose 6 kinds of transmittance as evaluation object including plain glass. The second, we made a mock-up models having different transmittance on the southern windows with model of real scale office building. The third, we select 17 pairs of adjectives for the evaluation of visual comfort on interior or exterior conditions with transmittance factor. The fourth, subjective evaluation experiment was done using selected evaluation adjectives and the result was analyzed. The results are as follows : the minimum transmittance appropriate for the office building is 30%∼40% and the optimal transmittance range is 40%∼60%.

Optimal Windows Transmittance by Energy Performance Analysis and Subjective Evaluation in office building (에너지성능분석 및 감성평가에 의한 오피스 창호의 적정 투과율 선정)

  • Kim, Byoung-Soo;Kim, Jung-Shin;Yim, Oh-Yon
    • Journal of the Korean Solar Energy Society
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    • v.24 no.3
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    • pp.73-83
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    • 2004
  • The purpose of this study is to select the optimal transmittance rate of windows in office buildings through subjective evaluation and energy performance analysis(computer simulation program ; DOE 2.1E). The results are as follows ; 1) In the subjective evaluation experiment, minimum transmittance of the glass is GE 30% and LT 70%, but the optimal transmittance rate is concluded in $40%\sim60%$. 2) As a result of the energy performance analysis, it is desirable for the building of consumptive with mainly air-conditioning to make transmittance as 40-60%. 3) Comparing foreign study on minimum and optimal transmittance rate is $25%\sim38%$, the minimum transmittance of this study is almost the same. But for the optimal transmittance rate, 20% more is needed for KOREAN.

The effect of splay elastic constant on the transmittance of fringe-field switching using a liquid crystal with positive dielectric anisotropy (유전율 이방성이 양인 액정을 사용한 FFS 모드에서의 스플레이 탄성상수에 따른 투과율 연구)

  • Kim, Tae-Hyun;Lee, Ji-Youn;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.518-519
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    • 2005
  • We have studied the transmittance of fringe-filed switching(FFS) using a liquid crystal with positive dielectric anisotropy. Generally, FFS having positive dielectric anisotropy has less transmittance than FFS using negative dielectric anisotropy. FFS mode transmittance depends on horizontal director deformation, however fringe filed is composed of vertical and horizontal field. Vertical field in the middle of electrode suppresses the transmittance of FFS mode, especially when we use positive one. So, it is important to prevent the LC director from the effect of vertical field. We changed the splay elastic constant and checked the transmittance. The transmittance of FFS having positive dielectric anisotropy was improved. Less tilted LC directors improve the transmittance of FFS using positive dielectric anisotropy. We can improve the transmittance by using LC which have high splay elastic constant when another LC properties are equal.

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Effect of Light Intensity and Temperature on the Growth and Root Yield of Panax ginseng (광도와 온도가 인삼의 생육 및 수량에 미치는 영향)

  • 이종화
    • Journal of Ginseng Research
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    • v.12 no.1
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    • pp.40-46
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    • 1988
  • This study was conducted to investigate the optimum temperature and light intensity of photosynthesis and transmittance in the shade for better growth and root yield of ginseng. The 3-year-old ginseng plants grown under the shade of 5, 10 and 20% transmittance did not show any significant difference in the stem length, stem diameter, leaf area and root length. The root diameter markedly increased under the shade of 10% and 20% transmittance, and the root was the heaviest under the shade of 20% transmittance. The 6-year-old ginseng plants grown at 20% transmittance showed the largest root diameter but the root length was not influenced by transmittance. The root was heaviest in the shade of 20% transmittance.

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A Study on Pattern Shape to Improve the Light Transmittance of Optical Device (조명용 광소자의 광 투과율 향상을 위한 패턴 형상 연구)

  • Joo, Won-Don
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.5
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    • pp.13-20
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    • 2012
  • The light transmittance of optical device is one of the important conditions to improve the product performance and it has researched through the various methods. One of these methods to improve the optical transmittance is to use a pattern on optical surface. The advantages of this method are to simplify the manufacturing process and to easy mass production. If a surface of glass has with the proper patterns, we can expect a great effect on optical transmittance. The purpose of this research is to derive a pattern to get high transmittance from a theoretical approach and to analyze the transmittance through the simulation. And then, we made a sample with a pattern and compared with the results from simulation and experiment.

APPLYING ALOS PRISM DATA TO RETRIEVE THE ATMPSPHERIC TRANSMITTANCE

  • Liu, Gin-Rong;Lin, Tang-Huang;Tsai, Fuan;Li, Kuo-Kuang
    • Proceedings of the KSRS Conference
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    • pp.310-313
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    • 2007
  • In this study, a new technique for atmospheric transmittance estimated from ALOS PRISM data is developed. It is based on satellite's observing radiances of different view angles and assumes that the cause of difference in radiances is the different view angles. The ALOS PRISM has three independent optical systems for viewing forward and backward and producing a stereoscopic image along the satellite's track. This stereo pair data can be used to estimate the transmittance according to the radiative transfer theory. This derived transmittance will be validated by the AERONET data and compared with the MODTRAN4 simulation results. Results show that the higher the land cover albedo, the better the derived transmittance compared to the AERONET data. Besides, this technique also shows the transmittance retrieval will be underestimated for the low land cover albedo.

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Optical Transmittance Change of Pd Thin Film by Hydrogen Absorption and Desorption (수소 흡수-방출에 의한 Pd 박막의 광투과도 특성변화)

  • Cho, Young sin
    • Transactions of the Korean hydrogen and new energy society
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    • v.12 no.4
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    • pp.287-292
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    • 2001
  • The optical transmittance change of Pd thin film due to hydrogen absorption and desorption was examined at room temperature. Hydrogen absorption and desorption cycling effects on optical transmittance were measured 6 times in the pressure range between 0 and 640 torr. Optical transmittance of Pd film was increasing with increasing hydrogen pressure. Ratio of optical transmittance to the change of pressure at $\beta$ phase is bigger than that of low hydrogen pressure range.

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Comparison of light transmittance in different thicknesses of zirconia under various light curing units

  • Cekic-Nagas, Isil;Egilmez, Ferhan;Ergun, Gulfem
    • The Journal of Advanced Prosthodontics
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    • v.4 no.2
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    • pp.93-96
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    • 2012
  • PURPOSE. The objective of this study was to compare the light transmittance of zirconia in different thicknesses using various light curing units. MATERIALS AND METHODS. A total of 21 disc-shaped zirconia specimens (5 mm in diameter) in different thicknesses (0.3, 0.5 and 0.8 mm) were prepared. The light transmittance of the specimens under three different light-curing units (quartz tungsten halogen, light-emitting diodes and plasma arc) was compared by using a hand-held radiometer. Statistical significance was determined using two-way ANOVA (${\alpha}$=.05). RESULTS. ANOVA revealed that thickness of zirconia and light curing unit had significant effects on light transmittance ($P$ <.001). CONCLUSION. Greater thickness of zirconia results in lower light transmittance. Light-emitting diodes light-curing units might be considered as effective as Plasma arc light-curing units or more effective than Quartz-tungsten-halogen light-curing units for polymerization of the resin-based materials.

An improved electrode structure of the Patterned Vertical Alignment Liquid Crystal Cell for high optical property

  • Choi, Yong-Hyun;Son, Jung-Hee;Yang, Jin-Seok;Ji, Seung-Hoon;Lee, Gi-Dong
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.502-505
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    • 2007
  • In this paper we propose a novel electrode structure for high transmittance in the Patterned Vertical Alignment (PVA) LC cell. Normally, the transmittance of PVA LC cell is depended on the shape of the electrode and cell gap. We studied the area decreasing the transmittance through the electrode structure for wide viewing angle and proposed new electrode design to change LC director configuration in the area. We use the 'TechWiz LCD' for calculation of the director configuration and optical characteristics. We show the comparison of the calculated optical transmittance between the conventional PVA mode and the proposed PVA mode. From the results, we confirm that the optical transmittance of the proposed structure of the PVA cell becomes higher.

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