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Reverse mode liquid crystal device

A liquid crystal device, reverse technology, applied in the direction of liquid crystal materials, instruments, electronic equipment, etc., can solve the problems of cost increase, substrate limitation, complicated process, etc., and achieve high contrast, low voltage driveability, and large difference in haze Effect

Active Publication Date: 2019-07-23
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the alignment treatment is performed using a liquid crystal alignment film, there is a problem that the process becomes complicated and the cost increases.
In addition to the above, there is also a problem that the material of the substrate is limited due to the use of a solvent or heat treatment, which causes the peeling of the sealant due to the contact between the sealing part in the cell and the alignment film.
However, the characteristics of the liquid crystal device produced by the method described in Non-Patent Document 1 are not sufficient, and a liquid crystal device with higher performance is required for practical use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0257]

[0258] The liquid crystal composition LC-1 was mixed with Irgacure (trademark) 651 at a weight ratio of 100 / 0.3, and named as liquid crystal composition LC-1-1. Irgacure (trademark) 651 is 2,2-dimethoxy-1,2-diphenylethan-1-one.

[0259] The phase transition temperature from the nematic phase to the isotropic liquid of the liquid crystal composition LC-1 was 79.5°C. The transition temperature was measured while heating at a rate of 2.0°C / min.

[0260] Table 2 describes the physical property data of the liquid crystal composition (LC-1).

[0261] [Table 2]

[0262] The name of the liquid crystal composition Liquid crystal composition (LC-1) Transition temperature from liquid crystal phase to isotropic liquid phase 79.5℃ Δn 0.156 Ordinary refractive index 1.496 abnormal light index 1.651 Δε -5.52 ε∥ 4.26 ε⊥ 9.78

[0263]

[0264] The liquid crystal composition LC-1-1, (1)-1, and M-1 were mixed at a weight r...

Embodiment 2

[0356]

[0357] The liquid crystal composition LC-2 and Irgacure (trademark) 651 were mixed at a weight ratio of 100 / 0.3, and named liquid crystal composition LC-1-1. Irgacure (trademark) 651 is 2,2-dimethoxy-1,2-diphenylethan-1-one.

[0358] The phase transition temperature from the nematic phase to the isotropic liquid of the liquid crystal composition LC-2 was 98.4°C. The transition temperature was measured while heating at a rate of 2.0°C / min.

[0359] Table 5 describes the physical property data of the liquid crystal composition (LC-2).

[0360] [table 5]

[0361] The name of the liquid crystal composition Liquid crystal composition (LC-2) Transition temperature from liquid crystal phase to isotropic liquid phase / °C 98.4℃ Δn 0.185 Ordinary refractive index 1.507 abnormal light index 1.692 Δε -3.25 ε∥ 3.69 ε⊥ 6.94

[0362]

[0363] The liquid crystal composition LC-2-1, (1)-1, and M-2 were mixed at a weight r...

Embodiment 3

[0408]

[0409] The liquid crystal composition LC-3 and Irgacure (trademark) 651 were mixed at a weight ratio of 100 / 0.3, and named liquid crystal composition LC-1-1. Irgacure (trademark) 651 is 2,2-dimethoxy-1,2-diphenylethan-1-one.

[0410] The phase transition temperature from the nematic phase to the isotropic liquid of the liquid crystal composition LC-3 was 122.8°C. The transition temperature was measured while heating at a rate of 2.0°C / min.

[0411] [Table 7]

[0412] The name of the liquid crystal composition Liquid crystal composition (LC-3) Transition temperature from liquid crystal phase to isotropic liquid phase / °C 122.8℃ Δn 0.1569 Ordinary refractive index 1.507 abnormal light index 1.692 Δε -3.50

[0413]

[0414] The liquid crystal compositions LC-3-1, (2)-1, M-1, and M-4 were mixed at a weight ratio of 91 / 2 / 4 / 3, and named liquid crystal composition MLC-F.

[0415] The liquid crystal composition LC-3-1, P-1-1...

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Abstract

Provided is a reverse mode light scattering-type liquid crystal device which is good enough for practical use and has low drive voltage, and which exhibits high haze when a voltage is applied thereto,while exhibiting low haze when no voltage is applied thereto. A reverse mode liquid crystal device which has a light control layer and at least a pair of electrodes, and which is characterized in that the light control layer contains a polymerization product of a polymerizable material that contains (A) a liquid crystal composition, (B) a vertical alignment agent and (C) at least one polymerizable compound selected from among polymer-forming monomers and polymer-forming oligomers.

Description

technical field [0001] The present invention relates to a reverse mode type liquid crystal device which is transparent when no voltage is applied and diffuses when voltage is applied. In particular, it relates to a dimming window or a smart window for blocking / transmitting external light or field of view in a window or shop window of a building, a partition in an interior, a sunroof of a car, a rear window, etc. The liquid crystal device used in. Background technique [0002] In general, in a reverse-mode light-scattering liquid crystal device, liquid crystals are vertically aligned with respect to a support substrate in order to obtain a transparent state when no voltage is applied. As a mechanism for obtaining the vertical alignment, an alignment film made of polyimide or the like has hitherto been used. In order to form a liquid crystal alignment film on an electrode, first, after applying a solution obtained by dissolving a liquid crystal alignment material in an organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13C09K19/56
CPCC09K19/56G02F1/13C09K2019/0448C09K2219/13C09K2019/3009C09K2019/3027C09K2019/122C09K2019/123C09K2019/301C09K2019/3016C09K2019/3422C09K2019/546C09K2019/3037C09K2019/3078C09K19/04G02F1/1334G02F1/133723G02F1/137B32B2457/20C09K2323/00B32B2457/202C09K2323/02G02F1/13347G02F1/13712G02F1/133742
Inventor 田辺真裕美松村良成藤田浩章
Owner JNC CORP
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