Zeon Corporation

Toppan Printing Co., Ltd.

Masashi Aimatsu

Kazuhiro Osato

Yuji Kubo

Sosuke Akao

Masakazu Saito

Godai Fukunaga

Takao Taguchi

Hitoshi Ooishi

Kei Sakamoto

Takeshi Itoi

Hironobu Suda

Yuki Yasu

Kazuhiro Oosato

Noritaka Mihashi

A pigment composition includes first and second cholesteric liquid crystal pigments. The first cholesteric liquid crystal pigment has a center wavelength of a selective reflection band within a wavelength range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The second cholesteric liquid crystal pigment has a selective reflection bandwidth of 200 nm or more within a wavelength range of 400 nm or more and 800 nm or less. The selective reflection band of the first cholesteric liquid crystal pigment and a selective reflection band of the second cholesteric liquid crystal pigment at least partially overlap with each other. A containing amount of the first cholesteric liquid crystal pigment relative to a total amount of the first and second cholesteric liquid crystal pigments is more than 30% by weight and 80% by weight or less.

Pigment composition, identification medium, and authenticity determination method

A pigment composition including: a first cholesteric liquid crystal pigment; and a second cholesteric liquid crystal pigment, wherein: the first cholesteric liquid crystal pigment is a pigment having: a center wavelength of a selective reflection band within a wavelength range of 400 nm or more and 800 nm or less; and a selective reflection bandwidth of 150 nm or less; the second cholesteric liquid crystal pigment is a pigment having a selective reflection bandwidth of 200 nm or more within a wavelength range of 400 nm or more and 800 nm or less; the selective reflection band of the first cholesteric liquid crystal pigment and a selective reflection band of the second cholesteric liquid crystal pigment at least partially overlap with each other; and a containing amount of the first cholesteric liquid crystal pigment relative to a total amount of the first cholesteric liquid crystal pigment and the second cholesteric liquid crystal pigment is more than 0% by weight and 30% by weight or less.

Pigment composition, identification medium, and method for determining authenticity

A phase difference plate includes a phase difference plate P1 and a phase difference plate P2. An in-plane slow axis of the phase difference plate P1 is orthogonal to an in-plane slow axis of the phase difference plate P2. The phase difference plate P2 includes a layer of a liquid crystal material oriented in an in-plane direction. An in-plane retardation ReP2(λ) at a wavelength A nm of the phase difference plate Psatisfies the following formulae (e1) and (e2): {Re2 (400)−Re2(550)}/{Re2(550)−Re2(700)}<2.90 (e1), and Re2(400)/Re2(700)>1.13 (e2). An in-plane retardation ReP1(λ) of the phase difference plate P1 at a wavelength λ nm and the in-plane retardation ReP2(λ) of the phase difference plate P2 at the wavelength λ nm satisfy the following formulae (e4) and (e5): ReP1(550)>ReP2(550) (e4), and ReP1(400)/ReP1(700)<ReP2(400)/ReP2(700) (e5).

Multilayer phase difference plate, polarizing plate, and image display device

An optically anisotropic layered body including a first optically anisotropic layer and a second optically anisotropic layer, wherein the first optically anisotropic layer satisfies 220 nm&#x3c;Re1(590)&#x3c;330 nm, Re1(450)/Re1(550)&#x2264;1.0, Re1(650)/Re1(550)&#x2265;1.0, and 0.95&#x3c;NZ1&#x3c;2.00, and the second optically anisotropic layer satisfies 110 nm&#x3c;Re2(590)&#x3c;165 nm, Re2(450)/Re2(550)&#x2264;1.0, Re2(650)/Re2(550)&#x2265;1.0, and &#x2212;1.5&#x2264;NZ2&#x2264;0.00.

Optically anisotropic laminate, circularly polarizing plate and image display device

An optically anisotropic layered body including a first optically anisotropic layer and a second optically anisotropic layer, wherein each of refractive indices of the second optically anisotropic layer, in-plane retardations of the first optically anisotropic layer, thickness direction retardations of the second optically anisotropic layer, in-plane retardations of the optically anisotropic layered body, NZ factors of the optically anisotropic layered body, and thickness direction retardations Rth of the optically anisotropic layered body satisfies specific relationships.

Optically anisotropic laminate, polarizing plate, and image display device

A phase difference plate including an optically anisotropic layer obtained by curing a composition (A) containing a polymerizable liquid crystal compound with reverse wavelength dispersion and a polymerizable monomer, wherein the polymerizable liquid crystal compound with reverse wavelength dispersion has a main chain mesogen and a side chain mesogen bonded to the main chain mesogen in the molecule thereof; the main chain mesogen and the side chain mesogen are oriented in different directions, whereby a birefringence &#x394;n of the optically anisotropic layer has reverse wavelength dispersion property; and retardations of a layer obtained by curing a composition (A0) in which the polymerizable monomer in the composition (A) is replaced by the polymerizable liquid crystal compound with reverse wavelength dispersion and retardations of the optically anisotropic layer satisfy specific relationship; and a circularly polarizing plate and a display device including the same.

Phase difference plate, circularly polarizing plate, and image display device

An optically anisotropic layered body including a first optically anisotropic layer and a second optically anisotropic layer, wherein in-plane retardations Re(H450), Re(H550), Re(H590), and Re(H650) of the first optically anisotropic layer at wavelengths of 450 nm, 550 nm, 590 nm, and 650 nm, respectively, and in-plane retardations Re(Q450), Re(Q550), Re(Q590), and Re(Q650) of the second optically anisotropic layer at wavelengths of 450 nm, 550 nm, 590 nm, and 650 nm, respectively, satisfy specific requirements.

Optically anisotropic laminate, circularly polarizing plate, and image display device

Liquid crystal composition containing polymerizable liquid crystal compound with reverse wavelength dispersion and one additive-monomer-A and additive-monomer-B, wherein: liquid crystal compound includes (in molecule), a main chain mesogen and side chain mesogen, optical axis of the main chain mesogen and optical axis of the side chain mesogen in different directions when compound is uniformly oriented, reversing wavelength dispersion property of birefringence; when the additive-monomer is in liquid crystal compound, the additive-monomer-A satisfies Expression(i); the additive-monomer-B satisfies Expression(ii) within wavelength range &#x3bb;=380 nm-780 nm: ne&#x3e;nea and no&#x3c;noa Expression(i), ne&#x3c;neb and no&#x3e;nob Expression(ii) (ne is a refractive index of liquid crystal compound in slow-axis-direction, no is a refractive index of liquid crystal compound in fast-axis-direction, nea and noa are refractive indices of the additive-monomer-A in ne and no direction when dispersed in liquid crystal compound, neb and neo are refractive indices of additive-monomer-B in ne and no direction when dispersed in liquid crystal compound).

Liquid crystal composition, phase difference plate, image display device, and method for controlling wavelength dispersion in optically anisotropic layer

A retardation layer that includes regions causing different retardations can be manufactured easily. A retardation substrate includes a substrate and a solidified liquid crystal layer facing its main surface. The solidified liquid crystal layer includes first to third regions, and a degree of depolarization for each of the regions is less than 5.0&#xd7;10. A difference between the maximum and minimum values of the degrees of depolarization obtained for the regions is less than 2.0&#xd7;10.

Retardation substrate, method of manufacturing the same, and liquid crystal display

A retardation layer that includes regions causing different retardations can be manufactured easily. A retardation substrate includes a substrate and a solidified liquid crystal layer supported by the substrate. The solidified liquid crystal layer includes first to third regions. The first to third regions re arranged on the substrate and different in degree of orientation of mesogens.

A liquid crystal display device may include a first substrate; a second substrate; a first polarizing plate on the first substrate; a second polarizing plate arranged on the second substrate, and so that a direction of an absorption axis of the second polarizing plate being perpendicular to a direction of an absorption axis of the first polarizing plate; a liquid crystal layer arranged between the first substrate and the second substrate; a color filter layer arranged between the liquid crystal layer and the first or the second substrate, the color filter layer having a plurality of pixels of two or more colors. The retardation thin film has in-plane birefringence index satisfying 0.75&#x2266;&#x394;n[fr]/&#x3bb;d[fr]&#x2266;1.35 for a region corresponding to a reflection part of a pixel and satisfying &#x394;n[t]&#x3c;1.2 &#xd7;10for a region corresponding to a transmission part of a pixel.

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Tokyo, Japan

Masashi Aimatsu