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Optical compensatory sheet
| Details |
Inventors: Ito, Yoji;
Assignee: Fuji Photo Film Co., Ltd. (Minami-ashigara, JP)
Primary Examiner: Thomas; Alexander
Assistant Examiner:
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, LLP
An optical compensatory sheet is composed of a transparent support, an orientation layer and an optically anisotropic layer. The orientation layer is a crosslinked polymer layer a surface of which has been subjected to rubbing treatment, and the optically anisotropic layer is made of a discotic liquid crystalline compound. A liquid crystal display is composed of a liquid crystal cell, a polarizing sheet arranged on each side of the cell, and the optical compensatory sheet provided between at least one side of the liquid crystal cell and the polarizing sheet. A color liquid crystal display has also the optical compensatory sheet. |
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DETAILED DESCRIPTION It is an object of the invention to provide an optical compensatory sheet which has an excellent durability, gives an enlarged viewing angle, and can be easily prepared.
It is another object of the invention to provide a process for preparing easily an optical compensatory sheet in high productivity, the sheet having features of showing an excellent durability and giving an enlarged viewing angle.
It is a further object of the invention to provide a liquid crystal display provided with an optical compensatory sheet which has an enlarged viewing angle and an excellent durability and which is almost free from reversion of black-and-white image or gradation.
It is a further object of the invention to provide a color liquid crystal display provided with an optical compensatory sheet which has an enlarged viewing angle, an excellent durability and which is almost free from reversion of black-and-white image or gradation.
There is provided by the invention an optical compensatory sheet which comprises a transparent support, an orientation layer provided thereon and an optically anisotropic layer provided on the orientation layer which comprises a compound having a discotic structure unit, wherein the orientation layer is a crosslinked polymer layer a surface of which has been subjected to rubbing treatment.
Preferred optical compensatory sheets according to the invention are as follows: 1) The optical compensatory sheet wherein a polymer of the crosslinked polymer is prepared by crosslinking a water-soluble resin (preferably polyvinyl alcohol or denatured (or modified) polyvinyl alcohol) in the layer.
2) The optical compensatory sheet described in 1) above wherein the denatured polyvinyl alcohol is obtained by reacting polyvinyl alcohol with a compound of the formula (1): ##STR1## in which R.
sup.
1 represents an alkyl group or an alkyl group substituted with alkyl, acryloyl, methacryloyl or oxiranyl (epoxy); W represents a halogen atom, an alkyl group or an alkoxy group; X represents an atomic group for forming active ester, acid anhydride or acyl halide together with --CO--; 1 is 0 or 1; and n is an integer of 0 to 4
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