Liquid crystal display device and useful liquid crystal composition

Patent metadata

Field	Value
Publication number	US-9404037-B2
Application number	US-201113825767-A
Country	US
Kind code	B2
Filing date	Sep 22, 2011
Priority date	Sep 28, 2010
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Provided is a liquid crystal display device of the VAIPS mode which uses a liquid crystal material having positive dielectric anisotropy and which has a fast response speed and excellent viewing angle characteristics without having a special cell structure such as pixel partitioning. Disclosed is a liquid crystal display device including: a plurality of independently controllable pixels; and a liquid crystal composition layer having positive dielectric anisotropy, wherein electrodes for controlling the pixels are provided on at least one of first and second substrates that interpose the liquid crystal phase, the long axis of the liquid crystal molecules of the liquid crystal composition layer is aligned substantially perpendicularly to the substrate surface or is in a hybrid alignment, the liquid crystal composition contains one kind or two or more kinds of compounds selected from a specific liquid crystal compound group, and the transmittance of the light that penetrates through the liquid crystal composition layer is modulated at the electric field generated by the electrode structure.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a first substrate;
a second substrate; and
a liquid crystal composition layer having positive dielectric anisotropy that is interposed between the first substrate and the second substrate, the liquid crystal display device having a plurality of pixels, with each of the pixels being independently controllable and comprising a pair of a pixel electrode and a common electrode, wherein the pair of a pixel electrode and the common electrode are provided on the first substrate, or the second substrate or both the first substrate and the second substrate, the long axis of liquid crystal molecules of the liquid crystal composition layer is aligned substantially perpendicularly to the substrate surface or is in a hybrid alignment,
wherein a liquid crystal composition of the liquid crystal composition layer comprises one or more compounds selected from the group consisting of compounds represented by General Formula (LC1) to General Formula (LC5):

wherein R 1 represents an alkyl group having 1 to 15 carbon atoms; one or more CH 2 groups in the alkyl group may be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF 2 O— or —OCF 2 — such that O atoms are not directly adjacent to each other; one or two or more H atoms in the alkyl group may be optionally substituted by halogen; A 1 , A 2 and A 3 each independently represent any one of the following structures:

wherein X 1 and X 2 each independently represent H, Cl, F, CF 3 or OCF 3 ; one or more CH 2 groups in A 1 and A 2 may be substituted by —CH═CH—, —CF 2 O— or —OCF 2 —; one or more CH groups in A 1 and A 2 may be substituted by N atoms; one or more H atoms in A 1 and A 2 may be substituted by Cl, F, CF 3 or OCF 3 ; X 1 to X 5 each independently represent H, Cl, F, CF 3 or OCF 3 ; Y represents Cl, F, CF 3 or OCF 3 ; Z 1 to Z 4 each independently represent a single bond, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 — or —CF 2 O—; at least one of Z 1 and Z 2 that exist is not a single bond; Z 5 represents a CH 2 group or an O atom; m 1 and m 2 each independently represent an integer from 0 to 3; m 1 +m 2 represents 1, 2 or 3; and m 3 each independently represent an integer from 0 to 2; and
the transmittance of light that has penetrated through the liquid crystal composition layer is modulated at the electric field generated by the electrode structure described above
wherein the liquid crystal composition does not include a compound having a cyano group.

2. The liquid crystal display device according to claim 1 , wherein the liquid crystal composition further comprises one or more compounds represented by General Formula (LC6):

wherein R 1 and R 2 each independently represent an alkyl group having 1 to 15 carbon atoms; one or more CH 2 groups in the alkyl group may be substituted by —O—, —CH═CH—, —CO—, —COO—, —C≡C—, —CF 2 O— or —OCF 2 — such that O atoms are not directly adjacent to each other; one or more H atoms in the alkyl group may be optionally substituted by halogen; Z 3 and Z 4 each independently represent a single bond, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 — or —CF 2 O— such that O atoms are not directly adjacent to each other; one or more H atoms in the alkyl group may be optionally substituted by halogen; Z 3 and Z 4 each independently represent a single bond; ml represents an integer from 0 to 3; B 1 to B 3 each independently represent any one of the following structures:

one or more CH 2 groups in B 1 to B 3 may be substituted by —CH═CH—, —CF 2 O— or —OCF 2 —; and one or more CH groups in B 1 to B 3 may be substituted by N atoms.

3. The liquid crystal display device according to claim 1 or 2 , wherein the compound of General Formula (LC1) is one or more compounds selected from the group consisting of compounds represented by General Formula (LC1)-1 to General Formula (LC1)-4:

wherein R 1 represents an alkyl group having 1 to 15 carbon atoms; one or more CH 2 groups in the alkyl group may be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF 2 O— or —OCF 2 — such that O atoms are not directly adjacent to each other; Y represents Cl, F, CF 3 or OCF 3 ; and X 1 , X 2 , L 1 and L 2 each represent H, Cl, F, CF 3 or OCF 3 .

4. The liquid crystal display device according to claim 1 or 2 , wherein the compound of General Formula (LC2) is one or more compounds selected from the group consisting of compounds represented by General Formula (LC2)-1 to General Formula (LC2)-10:

wherein R 1 represents an alkyl group having 1 to 15 carbon atoms; one or more CH 2 groups in the alkyl group may be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF 2 O— or —OCF 2 — such that O atoms are not directly adjacent to each other; X 1 , X 2 , L 1 , L 2 , L 3 and L 4 each represent H, Cl, F, CF 3 or OCF 3 .

5. The liquid crystal display device according to claim 1 or 2 , wherein the compound of General Formula (LC3) is one or more compounds selected from the group consisting of compounds represented by the following General Formula (LC3)-1 to General Formula (LC3)-28:

wherein R 1 represents an alkyl group having 1 to 15 carbon atoms; one or more CH 2 groups in the alkyl group may be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF 2 O— or —OCF 2 — such that O atoms are not directly adjacent to each other; one or more H atoms in the alkyl group may be optionally substituted by halogen; X 2 and X 4 each independently represent H, Cl, F, CF 3 or OCF 3 ; Z 1 represents a single bond, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 — or —CF 2 O—; and m 1 represents an integer from 0 to 3.

6. The liquid crystal display device according to claim 1 or 2 , wherein the compound of General Formula (LC4) is one or more compounds selected from the group consisting of compounds represented by the following General Formula (LC4)-1 to General Formula (LC4)-8, and the compound of General Formula (LC5) is one or more compounds selected from the group consisting of compounds represented by the following General Formula (LC5)-1 to General Formula (LC5)-6:

wherein R 1 , X 1 , X 2 , X 4 , X 5 and Y have the same meanings as R 1 , X 1 , X 2 , X 4 , X 5 and Y in General Formula (LC4

Assignees

• Takeuchi Kiyofumi
• Kaneoya Masakazu
• Dainippon Ink & Chemicals

Inventors

• Takeuchi Kiyofumi
• Kaneoya Masakazu

Classifications

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• C09K2019/3037

  Cy-Cy-C2H4-Ph · CPC title

• G02F2201/124

  interdigital · CPC title

• C09K2019/304

  Cy-C2H4-Ph-Ph · CPC title

• C09K2019/0466

  the linking chain being a -CF2O- chain · CPC title