Optical compensatory sheet comprising polymer film
First Claim
1. An optical compensatory sheet which consists of a polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm.
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Accused Products
Abstract
A polymer film is used as an optical compensatory sheet or a support thereof. The polymer film contains a rod-like compound. The rod-like compound in the form of a solution gives an ultraviolet absorption spectrum. In the spectrum, the wavelength of λmax at the maximum absorption peak is shorter than 250 nm. The spectrum of the rod-like compound is measured when the rod-like compound is in the form of solution. The polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm. The polymer film also has an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm. The values of the Rth450 and Rth590 satisfy the condition of Rth590-Rth450≧2 nm.
24 Citations
22 Claims
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1. An optical compensatory sheet which consists of a polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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9. An image display device having an optical compensatory sheet, wherein the optical compensatory sheet consists of a polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm.
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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10. A polarizing plate comprising a pair of transparent protective films and a polarizing membrane provided between the transparent protective films, wherein at least one of the protective films is an optical compensatory sheet which consists of a polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm, and wherein the optical compensatory sheet and the polarizing membrane are so placed that the transmission axis of the membrane is parallel or perpendicular to the slow axis of the polymer film.
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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11. An image display device having a polarizing plate, said polarizing plate comprising a pair of transparent protective films and a polarizing membrane provided between the transparent protective films, wherein at least one of the protective films is an optical compensatory sheet which consists of a polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm, and wherein the optical compensatory sheet and the polarizing membrane are so placed that the transmission axis of the membrane is parallel or perpendicular to the slow axis of the polymer film.
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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12. An optical compensatory sheet which comprises an optically anisotropic layer and a polymer film, said optically anisotropic layer being formed from a liquid crystal compound, and said polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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20. An image display device having an optical compensatory sheet, wherein the optical compensatory sheet comprises an optically anisotropic layer and a polymer film, said optically anisotropic layer being formed from a liquid crystal compound, and said polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm.
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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21. A polarizing plate comprising a pair of transparent protective films and a polarizing membrane provided between the transparent protective films, wherein at least one of the protective films is an optical compensatory sheet which comprises an optically anisotropic layer and a polymer film, said optically anisotropic layer being formed from a liquid crystal compound, and said polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm, and wherein the optical compensatory sheet and the polarizing membrane are so placed that the transmission axis of the membrane is parallel or perpendicular to the slow axis of the polymer film.
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
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22. An image display device having a polarizing plate, said polarizing plate comprising a pair of transparent protective films and a polarizing membrane provided between the transparent protective films, wherein at least one of the protective films is an optical compensatory sheet which comprises an optically anisotropic layer and a polymer film, said optically anisotropic layer being formed from a liquid crystal compound, and said polymer film containing a rod-like compound, which gives an ultraviolet absorption spectrum, in which the wavelength of λ
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
2 nm, and wherein the optical compensatory sheet and the polarizing membrane are so placed that the transmission axis of the membrane is parallel or perpendicular to the slow axis of the polymer film.
- max at the maximum absorption peak is shorter than 250 nm, said spectrum of the rod-like compound being measured when the rod-like compound is in the form of a solution, wherein the polymer film has an Rth retardation value of Rth450 measured at the wavelength of 450 nm in the range of 30 to 160 nm, and an Rth retardation value of Rth590 measured at the wavelength of 590 nm in the range of 50 to 200 nm, said values of the Rth450 and Rth590 satisfying the condition of Rth590-Rth450≧
Specification