Liquid crystal display device and associated liquid crystal media for use in the same

• US 8,848,158 B2
• Filed: 07/01/2009
• Issued: 09/30/2014
• Est. Priority Date: 07/01/2008
• Status: Active Grant

• Current Assignee: Gentex Corporation
• Original Assignee: Gentex Corporation
• Inventors: Zhang, Guomin
• Primary Examiner(s): KIANNI, KAVEH C
• Application Number:
  US12/459,470
• Publication Number:
  US 20100097563A1
• Time in Patent Office: 1,917 Days
• Field of Search: 349/186
• US Class Current: 349/186
• CPC Class Codes: C09K 19/3068 chain containing -COO- or -OCO- groups
• CPC Class Codes: C09K 19/3488 the heterocyclic ring having more than 6 members, e.g. macrocycles, phthalocyanines
• CPC Class Codes: C09K 19/42 Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
• CPC Class Codes: C09K 2019/3004 Cy-Cy
• CPC Class Codes: C09K 2019/3075 Cy-COO-Ph
• CPC Class Codes: C09K 2019/3083 Cy-Ph-COO-Ph

Abstract

A reverse mode liquid crystal display device, including: a first substantially transparent substrate having an electrically conductive material associated therewith; a second substrate having an electrically conductive material associated therewith; an insulating layer associated with at least one of the first and second substrates; and a liquid crystal medium contained within a chamber positioned between the first and second substrates which includes a macrocyclic ether and/or a borane; and a nematic, negative dielectric anisotropic liquid crystal mixture.

Claims

1. A reverse mode liquid crystal display device, comprising:

a first substantially transparent substrate having an electrically conductive material associated therewith;

a second substrate having an electrically conductive material associated therewith; and

a liquid crystal medium contained within a chamber positioned between the first substrate and the second substrate, the liquid crystal medium comprising;

a nematic, negative dielectric anisotropic liquid crystal; and

a macrocyclic compound, a borane, or a combination of any two or more thereof;

wherein;

the macrocyclic compound is represented as;

2. The reverse mode liquid crystal display device of claim 1 comprising the macrocyclic compound, wherein:

X₁-X₄ of the macrocyclic compound are individually O;

R₁-R₄ of the macryocyclic compound are absent;

m of the macrocyclic compound is 1 or 2; and

n of the macrocyclic compound is 1 or 2.

3. The reverse mode liquid crystal display device of claim 1, wherein:

R₁-R₄ of the borane are individually C₁-C₁₀ alkyl;

m of the borane is 9, 10, 11, or 12; and

n of the borane is 9, 10, 11, or 12, inclusive.

4. The reverse mode liquid crystal display device of claim 1, wherein the borane is:

5. The reverse mode liquid crystal display device of claim 1, wherein the nematic, negative dielectric anisotropic liquid crystal mixture comprises a compound represented by the following formula:

6. The reverse mode liquid crystal display device of claim 1, wherein the nematic, negative dielectric anisotropic liquid crystal mixture comprises a compound represented by the following formula:

7. The reverse mode liquid crystal display device of claim 1, wherein the nematic, negative dielectric anisotropic liquid crystal mixture comprises a compound represented by the following formula:

8. The reverse mode liquid crystal display device of claim 1, wherein the nematic, negative dielectric anisotropic liquid crystal mixture comprises a compound represented by the following formula:

9. The reverse mode liquid crystal display device of claim 1, wherein the nematic, negative dielectric anisotropic liquid crystal mixture comprises a compound represented by the following formula:

10. The reverse mode liquid crystal display device of claim 1, wherein at least one of the macrocyclic compound and borane comprises 1% to 5% by weight of the liquid crystal medium.

11. The reverse mode liquid crystal display device of claim 1, wherein the dielectric anisotropy Δ

_E of the nematic, negative dielectric anisotropic liquid crystal mixture ranges from −

1.0 to −

5.0.

12. The reverse mode liquid crystal display device of claim 1, wherein the dielectric anisotropy Δ

_E of the nematic, negative dielectric anisotropic liquid crystal mixture ranges from −

1.0 to −

3.0.

13. The reverse mode liquid crystal display device of claim 1, wherein the dielectric anisotropy Δ

_E of the nematic, negative dielectric anisotropic liquid crystal mixture ranges from −

1.0 to −

2.5.

14. The reverse mode liquid crystal display device of claim 1 comprising the macrocyclic compound, wherein:

X₁-X₄ of the macrocyclic compound N; and

R₁-R₄ of the macrocyclic compound are individually H or C₁-C₁₀ alkyl.

15. The reverse mode liquid crystal display device of claim 1 comprising the borane, wherein:

R₁-R₄ of the borane are individually ethyl;

m of the borane is 12; and

n of the borane is 12.

16. A reverse mode liquid crystal display device, comprising:

a first substrate having an electrically conductive material associated therewith;

a second substrate having an electrically conductive material associated therewith; and

a liquid crystal medium contained within a chamber positioned between the first substrate and the second substrate the liquid crystal medium comprising;

a borane and a macrocyclic ether in a solution of a nematic, negative dielectric anisotropic liquid crystal mixture;

wherein the macrocyclic ether is neutrally charged;

wherein the borane and the macrocyclic compound comprise 1% to 5% by weight of the liquid crystal medium; and

wherein a dielectric anisotropy Δ

_E of the nematic, negative dielectric anisotropic liquid crystal mixture ranges from −

1.0 to −

5.0.

17. The reverse mode liquid crystal display device of claim 16, wherein the macrocyclic ether is represented by the following formula: