Method of compensating wavelength dependence of birefringence of optical part, optical part, and display obtained with these

An optical component, dependent technology, used in optical components, optics, nonlinear optics, etc.

Inactive Publication Date: 2009-05-13
MITSUI CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method of compensating wavelength dependence of birefringence of optical part, optical part, and display obtained with these
  • Method of compensating wavelength dependence of birefringence of optical part, optical part, and display obtained with these
  • Method of compensating wavelength dependence of birefringence of optical part, optical part, and display obtained with these

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no. 1 approach

[0244] This embodiment relates to a method of correcting the wavelength dependence of birefringence. Specifically, the wavelength dependence of the birefringence of an optical component (optical element) (B) is corrected using a film (a) containing a (co)polymer (α) using At least one olefin selected from 4-methyl-1-pentene, 3-methyl-1-pentene and 3-methyl-1-butene is obtained as a (co)polymerization component.

[0245] First, the film (a), its production method, and the (co)polymer (α) will be described below.

[0246] (film (a))

[0247] The film (a) used in the above-mentioned correcting method contains a specific (co)polymer (α) selected from the group consisting of 4-methyl-1-pentene, 3-methyl- At least one olefin of 1-pentene and 3-methyl-1-butene is obtained as a (co)polymerization component.

[0248] Here, "contains" means that the whole film (a) is composed of (co)polymer (α) and the case where part of film (a) is composed of (co)polymer (α). Therefore, the film (...

no. 2 approach

[0343] (Optical Parts (Optical Elements))

[0344] This embodiment relates to an optical component having at least one film (a) comprising a (co)polymer (α) using a compound selected from 4-methyl-1-pentene, 3 At least one olefin among methyl-1-pentene and 3-methyl-1-butene is obtained as a (co)polymerization component. Details of the (co)polymer (α) and film (a) in this embodiment are the same as those described in the first embodiment.

[0345] A (co)polymer obtained by using at least one olefin selected from 4-methyl-1-pentene, 3-methyl-1-pentene and 3-methyl-1-butene as a (co)polymerization component ) The film (a) of the polymer (α) is an optical film whose retardation becomes smaller as the wavelength is shorter, and is an optical film with stable optical properties, low cost, light weight, and less environmental load. Therefore, the optical film using this optical film Parts are practically of high value.

[0346] The optical component in this embodiment preferably h...

no. 3 approach

[0360] The optical film used as the film (a) in the above embodiments may also have the following structures.

[0361] The optical film used as the film (a) in this embodiment contains at least A film of a (co)polymer (α) obtained by using an olefin as a (co)polymerization component.

[0362] In addition, the optical film of this embodiment satisfies the following conditions.

[0363] R(450) / R(590)≤0.95

[0364] In the above formula, R(450) and R(590) represent the in-plane retardation of the above-mentioned optical film at wavelengths of 450 nm and 590 nm, respectively.

[0365] In the present embodiment, by satisfying the above formula, the optical film can effectively correct the wavelength dispersion of the retardation.

[0366] In addition, in order to more effectively correct the wavelength dispersion of retardation, the optical film preferably satisfies the following conditions. In this way, correction can be performed more effectively.

[0367] R(450) / R(590)≤0.9 ...

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Abstract

The present invention is to provide a method of compensating the wavelength dependence of birefringence of an optical part (B) which comprises using a film (a) made of a (co)polymer (alpha) obtained from at least one olefin selected among 4-methyl-1-pentene, 3-methyl-1-pentene, and 3-methyl-1-butene as a (co)monomer ingredient. A laminated object is obtained through laminating polarizing films, a phase difference film C(nx>=ny>nz), phase difference films A(nx>ny>=nz or nz>=nx>ny) with a sequence of polarizing film-C-A-L-A-polarizing film or polarizing film-L-A-C-A-polarizing film. High contrast ratio and wide visual angle can be obtained by using phase difference film with low phase difference.

Description

technical field [0001] The present invention relates to a technology for correcting wavelength dependence of birefringence of various optical components. Background technique [0002] In recent years, with the development of various display devices and the like, the importance of various optical components such as retardation plates, polarizing plates, and antireflection films is increasing. Taking a liquid crystal display element as an example for illustration, the liquid crystal display element adjusts the polarization state of light in a liquid crystal cell (cell) and filters the light through a polarizing film, thereby controlling the brightness of the display and displaying images. [0003] Here, the light passing through the liquid crystal cell includes a circularly polarized component that cannot be filtered by a polarizing film, and the contrast of the display may deteriorate. Therefore, it is widely performed to correct such a circular polarization component by pas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13363
CPCG02F2202/40G02F2001/133637G02F2413/04G02B5/3033G02F1/13363G02B5/3083C09K2323/031G02F1/133637
Inventor 川本悟志高桥英一木津巧一高冈亨津川道男关亮一七条司朗山田义和坂井彰
Owner MITSUI CHEM INC
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