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Film containing oriented dye, method of manufacturing the same, and polarizer and liquid crystal display unit utilizing the same
| Details |
Inventors: Andreatta, Alejandro; Doi, Shuji;
Assignee: Sumitomo Chemical Company (Osaka, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Malinowski; Walter
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis LLP
Films containing oriented dye, methods of manufacturing such films, and polarizers and liquid crystal display devices utilizing the films are disclosed. The film contains at least one dichroic dye which is uniaxially oriented. A film has a thickness of not less than 1 nanometer and not greater than 5 micrometer and contains the dichroic dye of not less than 1 percent by weight and not greater than 100 percent by weight. The film has a peak of absorption at 400 nm through 800 nm and a dichroic ratio of not less than 25 at the peak of absorption. The film may include a micro-pattern having a minimum width in a film plane of not less than 1 micrometer and not greater than 200 micrometer. In such a case, the dichroic dye has a dichroic ratio of not less than 10 at the peak of absorption. A method of manufacturing such a film according to the invention includes the step of forming a dye-containing film on a substrate having a fluororesin alignment layer on the surface thereof. The dye-containing film includes at least one dichroic dye or a mixture of at least one dichroic dye and at least one polymer compound. In subsequent steps, the dye-containing film may be stripped off from the substrate and transferred to another substrate. |
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DETAILED DESCRIPTION It has now been found that through the use of fluororesin orientation films such as PTFE orientation films, one can achieve highly oriented dichroic dyes.
The present invention concerns these oriented dye-containing films, methods of manufacturing these films; and high performance polarizers and liquid crystal display devices which utilize these films.
Thus, in one aspect, this invention provides a uniaxially oriented film which includes one or more dichroic dyes.
This film contains at least 1% by weight dichroic dye up through being completely dichroic dye (100% by weight dye).
The remainder is a binder polymer or diluent or the like.
The film has a thickness of from 1 nanometer to 5 micrometers, a wavelength of peak absorbance of from 400 to 800 nanometers, and a dichroic absorbance ratio of not less than 25 at the wavelength of peak absorbance.
In another aspect, this invention provides a body of micro-patterned dye-containing, film.
This film comprises at least 1% by weight up to 100% by weight of uniaxially oriented dichroic dye.
This body of film has a thickness of from 1 nanometer to 5 micrometers and a wavelength of peak absorbance of from 400 to 800 nanometers, and a dichroic absorbance ratio of not less than 10 at the wavelength of peak absorbance.
This body has a length and width in the film plane with the width being in the range of from about 1 to about 200 micrometers.
In another aspect, this invention provides a method for manufacturing the uniaxially oriented film just described.
This method involves forming a film from a film-forming material which includes at least 1% by weight dichroic dye and has a thickness of from 1 nanometer to 5 micrometers and a wavelength of peak absorbance of from 400 to 800 nanometers.
This film-forming takes place on a substrate having a fluororesin alignment layer as its surface.
This produces a uniaxially oriented film having a dichroic absorbance ratio of not less than 25 at the wavelength of peak absorbance.
The film-forming material may in some cases be neat dichroic dye but alternatively may include a film-forming binder polymer mixed with dichroic dye
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