Transmission Controllability And Contrast Ratio Of Pcgh-Liquid Crystal Cells

Y. Anjaneyulu; D. W. Yoon

doi:10.1117/12.946384

13 May 1985 Transmission Controllability And Contrast Ratio Of Pcgh-Liquid Crystal Cells

Y. Anjaneyulu, D. W. Yoon

Proceedings Volume 0526, Advances in Display Technology V; (1985) https://doi.org/10.1117/12.946384
Event: 1985 Los Angeles Technical Symposium, 1985, Los Angeles, United States

Abstract

Transmission controllability (TC) and contrast ratio (CR) of PCGH-cells representing three thicknesses, 6, 9 and 12 μm, have been obtained from the transmission versus wavelength data. The phase change guest host (PCGH) mixture consists of 4% black dye in an optically active twisted nematic matrix. TC and CR are sensitive to wavelength and polarization of the incident light, and to the cell thickness. TC is low, less than 10%, for incident wavelengths of 400 to 500 nm. It reaches a maximum for 550 to 650 nm and becomes low for wavelengths above 700nm. The maximum increases in magnitude and becomes narrow with decreasing cell thickness. TC MAX is approximately 45% and 25% for 6 and 12 pm thicknesses respectively. PCGH cells with one polarizer provide better TC.CR products than the twisted nematic and dynamic scattering test cells in 600 to 650 nm wavelength region.

Citation Download Citation

Y. Anjaneyulu and D. W. Yoon "Transmission Controllability And Contrast Ratio Of Pcgh-Liquid Crystal Cells", Proc. SPIE 0526, Advances in Display Technology V, (13 May 1985); https://doi.org/10.1117/12.946384

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