Provided is a composition for forming a polarizer from which a polarizer with an excellent surface state can be formed, a polarizer, a laminate, and an image display device. The composition for forming a polarizer includes a polymerizable liquid crystal compound which has two or more rings selected from the group consisting of an aromatic ring and an alicyclic ring and two polymerizable groups and exhibits a liquid crystal state of a smectic phase, a monofunctional polymerizable compound which has two or more rings selected from the group consisting of an aromatic ring and an alicyclic ring and one polymerizable group, and a dichroic material, in which the number of atoms NA of the polymerizable liquid crystal compound and the number of atoms NB of the monofunctional polymerizable compound satisfy Expression (1), 0.35≤NB/NA≤0.65 (1).

The invention relates to a polymerizable LC material comprising one or more di- or multireactive mesogenic compounds and one or more compounds of formula S0, S1 or S2,

##STR00001##

wherein the individual radicals have one of the meaning as given in the claims. Furthermore, the present invention relates also to a method for its preparation, a polymer film with improved thermal durability and UV stability obtainable from a corresponding polymerizable LC material, to a method of preparation of such polymer film, and to the use of such polymer film and said polymerizable LC material for optical, electro-optical, decorative or security devices.

A display device with a high aperture ratio is provided. The display device includes, in a pixel, a first transistor, a second transistor, a first insulating layer, a second insulating layer, a conductive layer, a pixel electrode, a layer containing a liquid crystal material, and a common electrode. The first insulating layer is positioned over a channel formation region of the first transistor. The conductive layer is positioned over the first insulating layer. The second insulating layer is positioned over the first transistor, the second transistor, the first insulating layer, and the conductive layer. The pixel electrode is positioned over the second insulating layer, the layer containing a liquid crystal material is positioned over the pixel electrode, and the common electrode is positioned over the layer containing a liquid crystal material. The common electrode overlaps with the conductive layer with the layer containing a liquid crystal material and the pixel electrode therebetween. The pixel includes a first connection portion where the conductive layer is electrically connected to the first transistor and a second connection portion where the pixel electrode is electrically connected to the second transistor. The conductive layer, the pixel electrode, and the common electrode each have a function of transmitting visible light.

A polarizing film including a polarizer that is a cured product of a polymerizable liquid crystal composition is provided. The polymerizable liquid crystal composition contains both a polymerizable liquid crystal compound having at least one polymerizable group and a dichroic coloring matter. The polarizer is laminated on a surface, having a pore size of 0.45 nm to 0.57 nm, of a base material. The pore size is obtained by converting, into a diameter, an average free volume radius calculated by a positron lifetime measurement method in which the positron lifetime is measured by irradiating the surface with positrons with an injection energy of 3 kV.

Disclosed herein is a light emitting device and method of manufacturing such a device comprised of a series of photopolymerizable, chiral liquid crystalline layers that can be solvent cast on a substrate. The mixture of chiral materials in each successive layer may be blended in such a way that each layer has the same chiral pitch. Further the chiral materials in each layer may also be blended so that the ordinary and extraordinary refractive indices in each layer match the other layers such that the complete assembly of layers will optically function as a single relatively thick layer of chiral liquid crystal. The chiral nematic material in each layer can spontaneously adopt a helical structure with a helical pitch. The light emitting layers of the light emitting device can further comprise electroluminescent material that emits light into the band edge light propagation modes of the photonic crystal.

The invention relates to a polymerisable LC material comprising at least one monoreactive mesogenic compound, at least one di- or multireactive mesogenic compound and pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate). Furthermore, the present invention relates also to a method for its preparation, a polymer film with improved thermal durability obtainable from the corresponding polymerisable LC material, to a method of preparation of such polymer film, and to the use of such polymer film and said polymerisable LC material for optical, electro-optical, decorative or security devices.

Disclosed herein is a light emitting device and method of manufacturing such a device comprised of a series of photopolymerizable, chiral liquid crystalline layers that can be solvent cast on a substrate. The mixture of chiral materials in each successive layer may be blended in such a way that each layer has the same chiral pitch. Further the chiral materials in each layer may also be blended so that the ordinary and extraordinary refractive indices in each layer match the other layers such that the complete assembly of layers will optically function as a single relatively thick layer of chiral liquid crystal. The chiral nematic material in each layer can spontaneously adopt a helical structure with a helical pitch. The light emitting layers of the light emitting device can further comprise electroluminescent material that emits light into the band edge light propagation modes of the photonic crystal.

A polymerizable liquid crystal composition suitable for a heat-resistant, optical film that has a small selective wavelength shift due to thermal history is disclosed. The polymerizable liquid crystal composition contains a bifunctional polymerizable liquid crystal compound represented by the following general formula (I-2), a chiral compound, and an oxime ester polymerization initiator. In formula (I-2), P.sup.121 and P.sup.122 denote a polymerizable functional group, Sp.sup.121 and Sp.sup.122 denote a C1-18 alkylene group, a single bond, or the like, X.sup.121 and X.sup.122 denote O, S, or the like, q121 and g122 denote 0 or 1, and MG.sup.122 denotes a mesogenic group represented by the general formula (I-2-b). In the general formula (I-2-b), A1, A2, and A3 denote a 1,4-phenylene group, a 1,4-cyclohexylene group, or the like, Z1 and Z2 denote COO, OCO, or the like, and r1 denotes 0, 1, 2 or 3.

P.sup.121-(Sp.sup.121-X.sup.121).sub.q121-MG.sup.121-(X.sup.122-Sp.sup.122).sub.q122-P.sup.122(I-2)

-(A1-Z1).sub.r1-A2-Z2-A3-(I-2-b)

The problem that the present invention is to solve is to provide an optical film that has less alignment defects and is less liable to cause variation in the optical characteristics when placed in a high temperature state. The present invention provides an optical film containing a structural unit derived from a specific compound, that is, an optical film containing a structural unit derived from a compound represented by the general formula (I), which has less alignment defects and is less liable to cause variation in the optical characteristics when placed in a high temperature state, and also provides a display device including the optical film.

The invention relates to a polymerisable LC material comprising one or more di- or multireactive mesogenic compounds and one or more compounds of formula UVI, ##STR00001##
wherein the individual radicals have one of the meaning as given in the claims. Furthermore, the present invention relates also to a method for its preparation, a polymer film with improved thermal durability and UV stability obtainable from a corresponding polymerisable LC material, to a method of preparation of such polymer film, and to the use of such polymer film and said polymerisable LC material for optical, electro-optical, decorative or security devices.