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AssigneeFuji Photo Film Co., Ltd.
InventorsIchiro Amimori, Hidetoshi Watanabe, Jun Watanabe, Hiroshi Inoue
Estimating the term…
The present invention relates to an optical film having matt property and a matted film having a high transmittance which can be used for producing polarizing plates or liquid crystal display device excellent in display brightness and display quality by using the aforesaid films adjusted in a specific surface roughness or by using a specific two kinds of fine particles in a hard coat layer of the films. The present invention relates also to a polarizing plate of a high transmittance having an optical compensative capacity and matt property. A liquid crystal display device and a color liquid crystal display device using the aforesaid polarizing plate possessing an excellent viewing angle characteristics and is improved in Newton ring caused by contact with a light-tuning film and in non-uniformity in brightness due to the light-tuning film.
An optical film having matt property utilizable for an optical film on a backlight side of a liquid crystal cell in a liquid crystal display device, comprising a hard coat layer on a transparent support, the hard coat layer containing a crosslinked polymeric binder and transparent fine particles, and the surface roughness Ra being 0.1 to 0.3 μm and Rz being 1 to 3 μm.
A film having a high transmittance and matt property utilizable for an optical film on a backlight side of a liquid crystal cell in a liquid crystal display device, comprising a transparent support, a hard coat layer and a low refractive index layer having a refractive index lower than that of the transparent support, the hard coat layer and the low refractive index layer being overlaid on the transparent support in the written order, the hard coat layer containing a crosslinked polymeric binder and transparent fine particles, and the surface roughness Ra being 0.1 to 0.3 μm and Rz being 1 to 3 μm.
An optical film having matt property comprising a hard coat layer on a transparent support, the hard coat layer containing inorganic fine particles having been treated on the surface thereof with a silane-coupling agent, a crosslinked polymeric binder, and monodisperse transparent fine particles having an average particle diameter greater than the thickness of the hard coat layer and a particle diameter distribution of 0.2 or less in terms of a variation coefficient.
A film having a high transmittance and matt property utilizable for an optical film comprising a transparent support, a hard coat layer and a low refractive index layer having a refractive index lower than that of the transparent support, the hard coat layer and the low refractive index layer being overlaid on the transparent support in the written order, the hard coat layer containing inorganic fine particles having been treated on the surface thereof with a silane-coupling agent, a crosslinked polymeric binder, and monodisperse transparent fine particles having an average particle diameter greater than the thickness of the hard coat layer and a particle diameter distribution of 0.2 or less in terms of a variation coefficient.
An optical film having matt property utilizable for an optical film on a backlight side of a liquid crystal cell in a liquid crystal display device, comprising a hard coat layer on a transparent support, the hard coat layer containing inorganic fine particles having been treated on the surface thereof with a silane-coupling agent, a crosslinked polymeric binder, and monodisperse transparent fine particles having an average particle diameter greater than the thickness of the hard coat layer and a particle diameter distribution of 0.2 or less in terms of a variation coefficient, and the surface roughness Ra being 0.1 to 0.3 μm and Rz being 1 to 3 μm.
A film having a high transmittance and matt property utilizable for an optical film on a backlight side of a liquid crystal cell in a liquid crystal display device, comprising a transparent support, a hard coat layer and a low refractive index layer having a refractive index lower than that of the transparent support overlaid in the written order, the hard coat layer containing inorganic fine particles having been treated on the surface thereof with a silane-coupling agent, a crosslinked polymeric binder, and monodisperse transparent fine particles having an average particle diameter greater than the thickness of the hard coat layer and a particle diameter distribution of 0.2 or less in terms of a variation coefficient, and the surface roughness Ra being 0.1 to 0.3 μm and Rz being 1 to 3 μm.
A polarizing plate comprising a polarizing layer interposed between 2 transparent supports, an optical compensative layer containing an optical anisotropic layer on the surface of one of the transparent supports opposite to the polarizing layer, and a matted layer on the surface of the other transparent support opposite to the polarizing layer, the optical anisotropic layer comprised of a compound of a discotic structure unit and having a negative birefringence, a disk surface of the discotic structure unit being inclined to the surface of the transparent support, and an angle of the disk surface of the discotic structure unit with the surface of the transparent support being changed in the direction of depth of the optical anisotropic layer.
Dependencies are inferred from the claim text.
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Structural association of cells with optical devices, e.g. polarisers or reflectors: diffusing, scattering, diffracting elements
Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer
Structural association of cells with optical devices, e.g. polarisers or reflectors: illuminating devices
Direct backlight: including a specially adapted diffusing, scattering or light controlling members
Term end not estimated
The present invention relates to an optical film possessing matt property, a film having a high transmittance, a polarizing plate using the films and a liquid crystal display device using these elements.
The present invention relates also to a polarizing plate of a high transmittance possessing matt property and an optical compensative capacity and a liquid crystal display device and a color liquid crystal display device.
The construction of a liquid crystal display device in conventional art is shown in FIG. 1. An ordinary liquid crystal display device is comprised of a backlight 11 of an edge light type on the furthest back surface and, in the order from the furthest back surface, a light introductive plate 12 for injecting light from the back light toward the surface, a scattering sheet 13 for uniformly dispersing brightness of the light, and one or plural light-tuning sheet (light tuning film) 14 having a function for condensing the uniformly dispersed light by the scattering sheet to a given direction or alternatively a function for selectively transmitting or reflecting a specific polarized light. Light passing through these films is injected to a liquid crystal cell 17 interposed between a pair of polarizing plates 15 (backside polarizing plate) and 16 (surface polarizing plate). The polarizing plate is comprised usually of three layers of a polarizing layer (polarizer) interposed by 2 sheets of a protecting film. In the figure, 18 denotes a cooled cathode fluorescent tube as light source and 19 a reflective sheet.
FIG. 1 is a brief schematic side view showing an example of an ordinary liquid crystal display device.
FIG. 2 is a schematic cross sectional view showing the layer construction of the film having a high transmittance and matt property of the present invention.
FIG. 3 is a schematic cross sectional view showing a representative layer construction of the optical compensative film.
The present invention is divided into the three embodiments of optical films possessing matt property, films having a high transmittance, and polarizing plates and liquid crystal display device, and each embodiment will be explained hereunder in detail.
More precisely, the first embodiment concerned with the aforesaid paragraphs (1)˜(14) featured by the surface condition of the optical film, the second embodiment concerned with the aforesaid paragraphs (15)˜(29) featured by fine particles incorporated into the optical film, and the third embodiment concerned with the aforesaid paragraphs (30)˜(46) featured by a combination of the optical films provided inside and outside the polarizing plate will be explained hereunder in detail. The scope of the present invention involves an invention furnished with any one of the above first to third embodiments, an invention furnished with two of the above first to third embodiments, and an invention furnished with all of the above first to third embodiments.
By the term “matt property” referred to herein is meant a performance that a concavo-convex structure is formed on the surface and non-uniformity due to interference is not generated when brought into contact with a smooth surface. Haze is preferably 1.0˜10.0%, more preferably 2.0˜6.0%.