 Panel sheet and television receiver using the panel sheet |
| An object of this invention is to provide a television receiver which is designed integrally. A... |
|
| Matrix liquid-crystal display |
| What is claimed is: 1. An active liquid-crystal display based on the principle of electrically ... |
|
| Process for producing alkylated hydroxyl-containing aromatic compounds |
| OF THE INVENTION In its broadest aspect, the present invention involves a process for producing ... |
|
| Addressing a matrix of bistable pixels |
| I claim: 1. A method of addressing a matrix of bistable pixels which are defined by areas of ... |
|
| Analog active matrix emissive display |
| OF THE INVENTION In order to overcome the high power dissipation and the minimum number of gray ... |
|
| Video projector and optical light valve therefor |
| Accordingly, it is an object of the present invention to provide a linear, reflective, array which ... |
|
| Mini-trip computer for use in a rearview mirror assembly |
| In accordance with the present invention, a trip computer is incorporated into a rearview mirror ... |
|
| Coating apparatus and method |
| In view of the above-described circumstances, it is an object of the present invention to provide a ... |
|
|
1,3-dioxane derivatives, methods of preparation and liquid crystal compositions including same
| Details |
Inventors: Obikawa, Tsuyoshi; Ikukawa, Shuji; Nakayama, Jitsuko;
Assignee: Seiko Epson Corporation (Tokyo, JP)
Primary Examiner: Stoll; Robert L.
Assistant Examiner: Harris; C.
Attorney, Agent or Firm: Blum, Kaplan
Trans-2-phenyl-5-trans-4'-alkylcyclohexyl-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group of 1 to 10 carbon atoms, A is a single covalent bond or a --CH.sub.2 CH.sub.2 -- group, X is F or CN, Y is F if X is CN or Y is H or F if X is F, and the cyclohexane ring and the 1,3-dioxane ring are trans isomers. The 1,3-dioxane derivatives have large positive dielectric constant anisotropy (.DELTA..epsilon.), small birefringence (.DELTA.n) and have good compatibility with other liquid crystal compounds. The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A 1,3-dioxane derivative represented by the general formula: ##STR74## wherein R is a linear alkyl group having from 1 to 10 carbon atoms, A is a single covalent bond or a --CH.
sub.
2 CH.
sub.
2 -- group; X is F; Y is H or F; the cyclohexane ring and the 1,3-dioxane ring are the trans isomers and the compounds exhibit the nematic phase.
2.
The 1,3-dioxane derivative of claim 1, wherein A is a single covalent bond; X is F; Y is H, represented by the formula: ##STR75## 3.
The 1,3-dioxane derivative of claim 2, wherein the compound is trans-2-(4'-fluorophenyl)-5-(trans-4'-propylcyclohexyl)-1,3-dioxane represented by the formula: ##STR76## 4.
The 1,3-dioxane derivative of claim 1, wherein A is a single covalent bond; and X and Y are F represented by the formula: ##STR77## 5.
The 1,3-dioxane derivative of claim 4, wherein the compound is trans-2-(3',4'-difluorophenyl)-5-(trans-4'-propylcyclohexyl)-1,3-dioxane represented by the formula: ##STR78## 6.
The 1,3-dioxane derivative of claim 1, wherein A is --CH.
sub.
2 CH.
sub.
2 --; X is F; and Y is H, represented by the formula: ##STR79## 7.
The 1,3-dioxane derivative of claim 1, wherein the number of carbon atoms in R is between about 3 and 5.
8.
The 1,3-dioxane derivative of claim 1, wherein the number of carbon atoms in R is 4.
9.
A 1,3-dioxane derivative, trans-2-(4'-cyano-3'-fluorophenyl)-5-(2'-(trans-4"-butylcyclohexyl)ethyl-1 ,3-dioxane, represented by the formula: ##STR80## 10.
A liquid crystal composition comprising an effective amount of at least one 1,3-dioxane derivative for widening the nematic temperature range, decreasing the threshold voltage and widening the visual angle, the dioxane derivative having the general formula: ##STR81## wherein R is a straight chain alkyl group having from 1 to 10 carbon atoms, A is a single covalent bond or a --CH.
sub.
2 CH.
sub.
2 --; X is F; Y is H or F; the cyclohexane ring and the 1,3-dioxane ring are the trans isomers and the compounds exhibit the nematic phase
|
|
LCD 
