Neutralized Supertwisted Nematic LCD: Principle and Characteristics

Mitsuo NAGATA; Hiroshi WADA

Neutralized Supertwisted Nematic LCD: Principle and Characteristics

Mitsuo NAGATA, Hiroshi WADA

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The authors found that the coloration in appearance as a noticeable defect of super twisted nematic LCD (STN-LCD) can be cancelled out and monochromatic display can be realized by adding an optical compensator to the STN-LCD. This NTN mode display shows the steepness of threshold characteristic and the response times equivalent to those in STN, but its contrast ratio, viewing angle, and multiplex driving capability are far better than those in STN. A liquid crystal cell is used as a compensator. Monochromatic display can be done when both display cell and compensator cell satisfy the following three conditions. (1) Product values n・d of display cell and compensator cell coincide with each other. (2) The twist angles of liquid crystal layers are opposite to each other in their helix, but equal to each other in their absolute values. (3) The liquid crystal molecular directors adjacent to the opponent substrates of two cells are perpendicular to each other. In order to satisfy condition (1), the NTN cell gap must be controlled severer than the STN cell gap. The authors fabricated a prototype full-color NTN-LCD, and obtained an excellent contrast ratio of 10:1 to 17:1 by driving it at 1/240 duty ratio.

Publication: IEICE TRANSACTIONS on transactions Vol.E71-E No.11 pp.1080-1085

Publication Date: 1988/11/25

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Type of Manuscript: Special Section PAPER (Special Issue on Electronic Information Display Materials)

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Mitsuo NAGATA
Hiroshi WADA

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Mitsuo NAGATA, Hiroshi WADA, "Neutralized Supertwisted Nematic LCD: Principle and Characteristics" in IEICE TRANSACTIONS on transactions, vol. E71-E, no. 11, pp. 1080-1085, November 1988, doi: .
Abstract: The authors found that the coloration in appearance as a noticeable defect of super twisted nematic LCD (STN-LCD) can be cancelled out and monochromatic display can be realized by adding an optical compensator to the STN-LCD. This NTN mode display shows the steepness of threshold characteristic and the response times equivalent to those in STN, but its contrast ratio, viewing angle, and multiplex driving capability are far better than those in STN. A liquid crystal cell is used as a compensator. Monochromatic display can be done when both display cell and compensator cell satisfy the following three conditions. (1) Product values n・d of display cell and compensator cell coincide with each other. (2) The twist angles of liquid crystal layers are opposite to each other in their helix, but equal to each other in their absolute values. (3) The liquid crystal molecular directors adjacent to the opponent substrates of two cells are perpendicular to each other. In order to satisfy condition (1), the NTN cell gap must be controlled severer than the STN cell gap. The authors fabricated a prototype full-color NTN-LCD, and obtained an excellent contrast ratio of 10:1 to 17:1 by driving it at 1/240 duty ratio.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e71-e_11_1080/_p

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@ARTICLE{e71-e_11_1080,
author={Mitsuo NAGATA, Hiroshi WADA, },
journal={IEICE TRANSACTIONS on transactions},
title={Neutralized Supertwisted Nematic LCD: Principle and Characteristics},
year={1988},
volume={E71-E},
number={11},
pages={1080-1085},
abstract={The authors found that the coloration in appearance as a noticeable defect of super twisted nematic LCD (STN-LCD) can be cancelled out and monochromatic display can be realized by adding an optical compensator to the STN-LCD. This NTN mode display shows the steepness of threshold characteristic and the response times equivalent to those in STN, but its contrast ratio, viewing angle, and multiplex driving capability are far better than those in STN. A liquid crystal cell is used as a compensator. Monochromatic display can be done when both display cell and compensator cell satisfy the following three conditions. (1) Product values n・d of display cell and compensator cell coincide with each other. (2) The twist angles of liquid crystal layers are opposite to each other in their helix, but equal to each other in their absolute values. (3) The liquid crystal molecular directors adjacent to the opponent substrates of two cells are perpendicular to each other. In order to satisfy condition (1), the NTN cell gap must be controlled severer than the STN cell gap. The authors fabricated a prototype full-color NTN-LCD, and obtained an excellent contrast ratio of 10:1 to 17:1 by driving it at 1/240 duty ratio.},
keywords={},
doi={},
ISSN={},
month={November},}

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TY - JOUR
TI - Neutralized Supertwisted Nematic LCD: Principle and Characteristics
T2 - IEICE TRANSACTIONS on transactions
SP - 1080
EP - 1085
AU - Mitsuo NAGATA
AU - Hiroshi WADA
PY - 1988
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E71-E
IS - 11
JA - IEICE TRANSACTIONS on transactions
Y1 - November 1988
AB - The authors found that the coloration in appearance as a noticeable defect of super twisted nematic LCD (STN-LCD) can be cancelled out and monochromatic display can be realized by adding an optical compensator to the STN-LCD. This NTN mode display shows the steepness of threshold characteristic and the response times equivalent to those in STN, but its contrast ratio, viewing angle, and multiplex driving capability are far better than those in STN. A liquid crystal cell is used as a compensator. Monochromatic display can be done when both display cell and compensator cell satisfy the following three conditions. (1) Product values n・d of display cell and compensator cell coincide with each other. (2) The twist angles of liquid crystal layers are opposite to each other in their helix, but equal to each other in their absolute values. (3) The liquid crystal molecular directors adjacent to the opponent substrates of two cells are perpendicular to each other. In order to satisfy condition (1), the NTN cell gap must be controlled severer than the STN cell gap. The authors fabricated a prototype full-color NTN-LCD, and obtained an excellent contrast ratio of 10:1 to 17:1 by driving it at 1/240 duty ratio.
ER -