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Anisotropic scattering film

An anisotropic, scattering film technology, applied in the field of anisotropic scattering films, can solve the problems of difficulty in maintaining a uniform dispersion state, poor uniformity, etc., and achieve good in-plane uniformity

Inactive Publication Date: 2018-01-19
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a production method, it is necessary to form a film in a state in which mutually immiscible substances are uniformly dispersed, but it is difficult to maintain a uniform dispersion state, so there is a problem that the in-plane uniformity of the light scattering energy of the obtained film is not good. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] (Example)

[0072] The polymerizable liquid crystal composition (A) of the composition shown below was prepared.

[0073] [chemical 9]

[0074]

[0075] The polymerizable liquid crystal composition (A) transforms into a nematic phase at 70° C. and a smectic A phase at 35° C. when it is heated once to an isotropic liquid phase and then cooled. This smectic A phase also remains at room temperature. Composition (A-1) was prepared by adding 3% of photopolymerization initiator IRGACURE 907 (manufactured by Ciba Specialty Chemicals) and 0.01% of polypropylene with a mass average molecular weight of 1650 as a horizontal alignment additive to this composition (A). . Furthermore, composition (A-1) was dissolved in propylene glycol monomethyl ether acetate so that the concentration might become 30%, and coating composition (A-2) was prepared.

[0076] Next, a TAC film (50 μm in thickness) having a width of 15 cm and a length of 15 cm was prepared, and rubbing treatment was...

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Abstract

The present invention provides an anisotropic scattering film that, as a result of the presence of a plurality of regions in which a liquid crystal material is uniaxially oriented in a horizontal direction and a plurality of regions in which the liquid crystal material is oriented in a vertical direction, has excellent uniformity in the light scattering ability in the film surface. At the boundarybetween the regions of uniaxial, horizontal orientation and the regions of vertical orientation, light oscillating parallel to the slow axis (long axis direction of the liquid crystal molecules) of the regions of uniaxial, horizontal orientation is scattered due to the difference in the refractive indexes, while light oscillating perpendicular to the slow axis of the regions of uniaxial, horizontal orientation is not scattered, as there is no difference in the refractive indexes. The anisotropic scattering film of the present invention achieves the function of an anisotropic scattering film as a result of such action.

Description

technical field [0001] The present invention relates to an anisotropic scattering film having different scattering energy depending on the vibration direction of light. Background technique [0002] It is known that anisotropic scatterers which have different scattering energy depending on the vibration direction of light can be applied to projection screens (Patent Document 1) and to improve the brightness of liquid crystal displays (Patent Documents 2 and 3). Such an anisotropic scatterer can be produced by making a transparent substance having an anisotropic shape and a refractive index different from that of the transparent matrix uniformly dispersed in a positional relationship that moves parallel to each other in an orderly manner (patent Document 1); Scattering particles with an aspect ratio of 1 or more are dispersed and arranged in support media with different refractive indices (Patent Document 2); a uniaxial uniform orientation structure formed by droplets compose...

Claims

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Application Information

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IPC IPC(8): G02B5/02C09K19/38
CPCC09K19/38C09K19/2014C09K19/3852C09K2019/0448C09K2019/122G02B5/0242C09K19/56C09K2219/03G02B5/0257G02B5/0268C09K19/3838G02B1/02
Inventor 长谷部浩史中田秀俊
Owner DAINIPPON INK & CHEM INC
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