Abstract: A liquid crystal display device where both improvement in light transmittance of a liquid crystal display panel having a photo alignment film and suppression of occurrence of after image can be achieved. The liquid crystal display device has a liquid crystal display panel including pixels each having an active device, a pixel electrode, a common electrode and a liquid crystal layer arranged in a dot matrix array. The liquid crystal display panel has a first substrate, a second substrate, and a liquid crystal layer provided between the first substrate and the second substrate. The first substrate has the active device, the pixel electrode, the common electrode and a first alignment film. The second substrate has a second alignment film. The first alignment film and the second alignment film are respectively a photo alignment film formed by irradiating a photo decomposition type insulating film with light.

Abstract: Disclosed is a manufacturing method of a liquid crystal display device which is a manufacturing method of a liquid crystal display device including a liquid crystal alignment film to which an alignment regulating force is imparted by a photo-alignment treatment, including: a film forming step of forming a film containing a polymer whose main chain is cleaved by irradiation with light; a photo-alignment step of imparting an alignment regulating force to the film formed in the film forming step by irradiation of the film with light in an atmosphere of a temperature lower than 100° C.; and a removing step of removing a low-molecular weight component generated by cleaving the main chain of the polymer through the light irradiation after the light irradiation. Also disclosed is a liquid crystal display device manufactured by the manufacturing method.

Abstract: An object of the present invention is to provide a liquid crystal display device that has an excellent mass-productivity and gives an image improved by the reduction of the chromaticity difference between white display and black display, the reduction of coloring and luminance in black display, and the improvement of the contrast ratio. In the present invention, of a pair of alignment films 131 and 132 formed on a pair of substrates 101 and 102, respectively, the alignment film 132 formed on the glass substrate 102 on the observer side is made of a material obtained by adding a photoisomerized compound to a photosensitive polymer and has anisotropic absorption all over the visible light wavelength region (approximately 400 nm to 750 nm).

Abstract: A liquid crystal display device includes: a pair of substrates at least one of which is transparent; a liquid crystal layer disposed between the pair of substrates; an electrode group formed on at least one substrate of the pair of substrates, for applying an electric field to the liquid crystal layer; a plurality of active elements connected to the electrode group; and a liquid crystal alignment film disposed on at least one substrate of the pair of substrates, in which the liquid crystal alignment film, which is formed by a photo-alignment process, contains polyimide formed using tetracarboxylic acid dianhydride and/or diamine each having a specific chemical structure.

Abstract: A liquid crystal display device and method includes a pair of substrates, a liquid crystal layer sandwiched therebetween, first and second alignment films formed on respective ones of the substrates, at least one first projecting portion which is disposed between the first alignment film and one of the substrates, and at least one second projecting portion disposed between the second alignment film and the other of the substrates, facing the at least one first projecting portion. A height of the at least one first projecting portion is smaller than a height of the at least one second projecting portion, and an area of an upper surface of the at least one first projecting portion is smaller than an area of an upper surface of the at least one second projecting portion.

Abstract: In an IPS type liquid crystal display device, a light shielding film, a red color filter, an overcoat film, and an alignment film are formed in this order on a counter substrate. However, the alignment film is not formed in a seal portion. When the alignment film is subjected to photo-alignment with ultraviolet radiation, a portion of the overcoat film not covered with the alignment film is degraded by ultraviolet radiation. In order to prevent moisture penetrating from the degraded overcoat film from reaching the light shielding film to thereby alter the light shielding film and from causing the peeling of the light shielding film, the red color filter is disposed below the overcoat film to block the moisture.

Abstract: A liquid crystal display device which can reduce or eliminate a display defect is provided. The liquid crystal display device includes a first alignment film formed on one of the pair of substrates; a second alignment film formed on another of the pair of substrates; first projecting portions which are provided to the first alignment film and project into the liquid crystal layer by first constitutional members which constitute a layer below the first alignment film; and second projecting portions which are provided to the second alignment film, face the first projecting portions, and project into the liquid crystal layer by second constitutional members which constitute a layer below the second alignment film, the first projecting portion being set lower than the second projecting portion, and an area of an upper surface of the first projecting portion being set smaller than an area of an upper surface of the second projecting portion.

Abstract: The present invention provides a liquid crystal display device to which retardation of a desired value is imparted. In the liquid crystal display device of the invention, orientation films which are oriented by the light radiation possess a retardation value of 1.0 nm or more and an anchoring strength of 1.0×10?3 Jm?2 or more.

Abstract: A liquid crystal display device of the invention can, when a liquid crystal panel receives a pressing force from the outside, prevent the displacement of columnar spacers which are formed over a counter substrate for defining a distance between the counter substrate and a TFT substrate in the direction parallel to the substrate. In a case where the TFT substrate or the counter substrate receives a pressing force from the outside, when the columnar spacers which define the distance between the TFT substrate and the counter substrate are displaced in one or more directions, the alignment disorder of liquid crystal molecules occurs or an alignment film is shaved so that leaking of light occurs due to shaved chips of the alignment film and hence, contrast of an image is lowered. Projections are formed on a TFT substrate side by making use of bus electrodes provided for preventing lowering of a voltage of counter electrodes.

Abstract: An alignment film is given a 2-layer structure comprising a photoalignment film that is photoalignable and a low-resistivity alignment film whose resistivity is smaller than that of the photoalignment film. The photoalignment film is formed by a polyimide whose precursor is polyamide acid alkyl ester, the number molecular weight of the photoalignment film is large, and the stability of alignment of the photoalignment film by photoalignment is excellent. The low-resistivity alignment film is formed by a polyimide whose precursor is polyamide acid, the number molecular weight of the low-resistivity alignment film is small, and the resistivity of the low-resistivity alignment film is small. The 2-layer structure alignment film can be maintaining an excellent photoalignment characteristic, so DC afterimages can be controlled.

Abstract: An image retention phenomenon and black unevenness generated after long-time operation in the liquid crystal device are prevented. By using a material having a polyamide acid ester as a precursor less likely to adsorb impurities on a boundary for an alignment film and a material having a dielectric constant anisotropy ?? of 5 or less for liquid crystals, adsorption of an antioxidant dispersed in the liquid crystals is suppressed to prevent oxidation of the liquid crystals. The extent that impurities are intruded into the liquid crystals is reduced by restricting the dielectric constant anisotropy ?? of the liquid crystals to 5 or less, thereby capable of preventing the image retention phenomenon and the black unevenness.

Abstract: A liquid crystal display device which can reduce or eliminate a display defect is provided. The liquid crystal display device includes a first alignment film formed on one of the pair of substrates; a second alignment film formed on another of the pair of substrates; first projecting portions which are provided to the first alignment film and project into the liquid crystal layer by first constitutional members which constitute a layer below the first alignment film; and second projecting portions which are provided to the second alignment film, face the first projecting portions, and project into the liquid crystal layer by second constitutional members which constitute a layer below the second alignment film, the first projecting portion being set lower than the second projecting portion, and an area of an upper surface of the first projecting portion being set smaller than an area of an upper surface of the second projecting portion.

Abstract: Disclosed herein is an IPS type liquid crystal display device superior in mass productivity and improved in image quality with a higher contrast ratio by decreasing the occurrence of defective display due to the disorder of the initial liquid crystal alignment by the liquid orientation control film and realizing stable alignment of liquid crystals. A liquid crystal display device comprises: a pair of substrates 101 and 102, at least one of which is transparent; a liquid crystal layer 110? disposed between the pair of substrates; a group of electrodes formed on at least one of the pair of substrates to apply an electric field to the liquid crystal layer; plural active elements 115 connected to the group of electrodes; and an orientation control film 109 disposed on at least one of the pair of substrates, wherein said orientation control film is made of a photosensitive polyimide and a polyamide acid ester and is given orientation control ability by being irradiated with substantially linearly polarized light.

Abstract: In a liquid crystal display device using a photodecomposition type light orientation film, the deterioration of display performance due to an impurity resulting from a light orientation treatment of the orientation film is suppressed to enable high-quality image display. In the orientation film to which a liquid crystal orientation function is provided, the amount of decomposition product due to the orientation film is 3957.5 ng or less per 100 cm2.

Abstract: An object of the present invention is to provide a liquid crystal display device that has an excellent mass-productivity and gives an image improved by the reduction of the chromaticity difference between white display and black display, the reduction of coloring and luminance in black display, and the improvement of the contrast ratio. In the present invention, of a pair of alignment films 131 and 132 formed on a pair of substrates 101 and 102, respectively, the alignment film 132 formed on the glass substrate 102 on the observer side is made of a material obtained by adding a photoisomerized compound to a photosensitive polymer and has anisotropic absorption all over the visible light wavelength region (approximately 400 nm to 750 nm).

Abstract: In a liquid crystal display device using a photodecomposition type light orientation film, the deterioration of display performance due to an impurity resulting from a light orientation treatment of the orientation film is suppressed to enable high-quality image display. In the orientation film to which a liquid crystal orientation function is provided, the amount of decomposition product due to the orientation film is 3957.5 ng or less per 100 cm2.

Abstract: The present invention provides a liquid crystal display device to which retardation of a desired value is imparted. In the liquid crystal display device of the invention, orientation films which are oriented by the light radiation possess a retardation value of 1.0 nm or more and an anchoring strength of 1.0×10?3 Jm?2 or more.

Abstract: It is possible to enhance the utilization efficiency of a light source and impart an orientation control performance and a pretilt angle to an orientation film in a short treatment time. Substrates to which orientation films are applied are mounted on stages which are sequentially transported to a main irradiation region and a sub-irradiation region. Light flux irradiated from a light source device having a single light source receives polarization treatment at a polarization unit, thus generating main polarized light and sub-polarized light. The main polarized light is irradiated to the orientation film formed on the substrate which is transported to a main irradiation region, thus imparting orientation control performance to the orientation film. Subsequently, the substrate is transported to a sub-irradiation region, and sub-polarized light is irradiated to the orientation film to which orientation control performance is already imparted, thus imparting a pretilt angle to the orientation film.

Abstract: A liquid crystal display device can obviate the generation of an extinction pattern. In the liquid crystal display device, molecules of liquid crystal are arranged in the vertical direction with respect to the substrate at the time of applying no voltage. A plurality of protruding portions are scattered on a surface of one substrate which is brought into contact with the liquid crystal material in respective pixel regions, and projecting portions or recessed portions are provided about these protruding portions. The projecting portions or the recessed portions are substantially aligned with the directions of the respective polarization axes of one polarizer which is provided to a surface of one substrate at a side opposite to a liquid crystal side and the other polarizer which is provided to a surface of the other substrate at a side opposite to a liquid crystal side.

Abstract: A liquid crystal display apparatus including one pair of substrates, at least one of said substrates being transparent, one pair of polarizing plates arranged on the paired substrates respectively, a liquid crystal layer sandwiched by the paired substrates, a liquid crystal display panel in which an electrode group is formed on at least one of the paired substrates and is to apply an electric field to the liquid crystal layer, and a light source unit arranged on a rear surface of the liquid crystal display panel, a monoaxial absorption anisotropic layer provided between the paired polarizing plates. In such apparatus, a high contrast ratio can be achieved due to suppression of black luminance. Also, better display qualities can be achieved by reducing a blue changing phenomenon of black representation.