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1993•The Journal of The Institute of Image Information and Television EngineersOpen access

A Full-Color Direct-View TFT-LCD with a Polymer-Dispersed Structure.

Hidefumi Yoshida, Hideaki Tsuda, Kimiaki Nakamura, Makoto Ohashi

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Abstract

We propose a direct-view TFT-LCD with a wide viewing-angle which uses a polymerdispersed liquid-crystal panel and a pair of polarizers.We call this device a polymer-dispersed LCD with crossed Nicols (PDN).The PDN allows panels to be made with low scattering levels .This suggests the use of fluorinated liquid crystals (F-LC) that show a high voltage-holding ratio in TN-LCDs .We found that F-LCs show good solubility with resins having low solubility parameters .A voltage-holding ratio of over 98% is shown, which is almost equal to the value for TN-LCD .The vertical viewing range exceeds ±60°, with a contrast ratio of over 5 and no image reversal.The range is almost three times the TN-LCD value.Molecular alignment is symmetrical and the variation of overall retardation is suppressed .The TFT-LCDs fabricated show a high contrast ratio and no imag reversal at any viewing angle .

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We propose a direct-view TFT-LCD with a wide viewing-angle which uses a polymerdispersed liquid-crystal panel and a pair of polarizers.We call this device a polymer-dispersed LCD with crossed Nicols (PDN).The PDN allows panels to be made with low scattering levels .This suggests the use of fluorinated liquid crystals (F-LC) that show a high voltage-holding ratio in TN-LCDs .We found that F-LCs show good solubility with resins having low solubility parameters .A voltage-holding ratio of over 98% is shown, which is almost equal to the value for TN-LCD .The vertical viewing range exceeds ±60°, with a contrast ratio of over 5 and no image reversal.The range is almost three times the TN-LCD value.Molecular alignment is symmetrical and the variation of overall retardation is suppressed .The TFT-LCDs fabricated show a high contrast ratio and no imag reversal at any viewing angle .

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Available abstract

We propose a direct-view TFT-LCD with a wide viewing-angle which uses a polymerdispersed liquid-crystal panel and a pair of polarizers.We call this device a polymer-dispersed LCD with crossed Nicols (PDN).The PDN allows panels to be made with low scattering levels .This suggests the use of fluorinated liquid crystals (F-LC) that show a high voltage-holding ratio in TN-LCDs .We found that F-LCs show good solubility with resins having low solubility parameters .A voltage-holding ratio of over 98% is shown, which is almost equal to the value for TN-LCD .The vertical viewing range exceeds ±60°, with a contrast ratio of over 5 and no image reversal.The range is almost three times the TN-LCD value.Molecular alignment is symmetrical and the variation of overall retardation is suppressed .The TFT-LCDs fabricated show a high contrast ratio and no imag reversal at any viewing angle .

Key concepts: Liquid-crystal display, Contrast ratio, Polarizer, Viewing angle, Materials science, Liquid crystal, Polymer, Thin-film transistor

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