Abstract: A liquid crystal display device includes a TFT substrate having an organic passivation film, and a counter substrate, with liquid crystals inside of the liquid crystal display device. A columnar spacer is formed on the counter substrate, which defines a distance between the TFT substrate and the counter substrate, and a concavo-convex pedestal is formed in a pixel region of the TFT substrate, the concavo-convex pedestal being provided in facing relation to the columnar spacer. The concavo-convex pedestal is formed with a convex portion and a concave portion at a bottom of the concavo-convex pedestal, with a top end of the columnar spacer being in contact with two or more convex portions formed on the bottom of the concavo-convex pedestal, and an area at the bottom of the concavo-convex pedestal being larger than the area at the top end of the columnar spacer.

Abstract: A solution for an alignment film of a liquid crystal display device includes a photo decomposition type polyimide acid which forms the alignment film in response to radiation of a polarized light, wherein a viscosity of the solution is not more than 35 mPa·s.

Abstract: To form an optical alignment film having large anchoring strength and suppress an AC afterimage of a liquid crystal display device, in a liquid crystal display device of an IPS mode. In an alignment film material subjected to optical alignment processing, polyimide which becomes a rigid high molecule and polyimide which becomes a flexible high molecule are mixed and used. The material of the present invention can easily rotate oligomer after irradiating polarized ultraviolet rays and improve a UV-absorbed two-color ratio of an alignment film. Accordingly, an anchoring strength for liquid crystals by the alignment film is large to suppress an AC afterimage.

Abstract: A liquid crystal display device includes first and second substrates with a liquid crystal layer therebetween. A planer electrode and a plurality of overlapping linear electrodes are formed on the first substrate with an insulation film disposed between the planar electrode and the plurality of linear electrodes. A projecting portion is formed on one of the first and second substrates and an alignment film is formed on each of the first and second substrates and on the projection portion. The alignment films are made of a photo-decomposition-type material, and a film thickness of the alignment film on the projecting portion and a film thickness of a portion of the alignment film facing the projecting portion satisfy a predetermined relationship.

Abstract: An object of the present invention is to enhance transmissivity and the luminance of a screen in an IPS liquid crystal display device. To achieve the object, in the IPS liquid crystal display device according to the present invention, a counter electrode is formed flatly and solidly on an organic passivation film, a pixel electrode having a slit is formed on the counter electrode via an interlayer insulation film, and an alignment film the orientation of which is controlled by optical orientation is formed on the pixel electrode. The transmissivity is enhanced by also making the inside of the contact hole function as a transmissible area for image formation by applying optical orientation to the alignment film in the contact hole to result in enhancement of the luminance of the screen.

Abstract: Provided is a high quality liquid crystal display device adapted to suppress scraping of alignment film and prevent micro light spot fault. The liquid crystal display device comprises: a plurality of columnar spacers and a first alignment film disposed over a first substrate; an insulation film disposed over a second substrate; and a second alignment film disposed over the insulation layer; receiving pedestals for the columnar spacers, wherein: the second alignment film is not formed over the central portion of each of the receiving pedestals; and around the outer peripheral portion of each receiving pedestal, the second alignment film has an inclined thickness distribution which is such that the thickness thereof increases gradually from the central portion to the outside position of the receiving pedestal.

Abstract: The present invention prevents the shaving of an alignment film caused by a columnar spacer in a liquid crystal display device of an IPS method using photo-alignment. A plinth higher than a pixel electrode is formed at a part where a columnar spacer formed over a counter substrate touches a TFT substrate. When an alignment film of a double-layered structure is applied over the pixel electrode and the plinth, the thickness of the alignment film over the plinth reduces by a leveling effect. When photo-alignment is applied in the state, a photodegraded upper alignment film over the plinth disappears and a lower alignment film having a high mechanical strength remains. As a result, it is possible to prevent the shaving of the alignment film.

Abstract: In the step of curing a resin for bonding a TFT substrate and a counter substrate each having an alignment film that has been optically aligned by using UV-light, damage to the alignment film due to the UV-light can be prevented without using a light shielding mask. A UV-light absorption layer is formed between each black matrix on the counter substrate. The TFT and counter substrates are sealed at their periphery by a resin that is cured by UV-light radiated from the counter substrate side. Since the absorption layer has a high absorbability to UV-light at a wavelength of 300 nm or less that degrades the alignment film, damage to the alignment film due to the UV-light for curing the resin can be prevented. Thus, provision of a light shielding mask for shielding the UV-light for the display region can be saved.

Abstract: An organic solvent includes a photo decomposition type polyimide acid which forms an alignment film of a liquid crystal display device by radiation of a polarized light. A viscosity of the photo decomposition type polyimide acid is not more than 35 mPa·s.

Abstract: Provided is a solvent for forming an alignment film capable of fabricating a liquid crystal alignment film having high quality, an improved imidization ratio, large surface anisotropy, and a strong anchoring force. The solvent for forming an alignment film including a polymer for a liquid crystal display includes the polymer of the alignment film including polyimide and a variable compound capable of changing a chemical structure for evaporating after imidizing and sintering, which is in a liquid state during a film-forming process of coating, imidizing, and sintering polyamic acid which is a precursor of polyimide.

Abstract: Disclosed is a liquid crystal display device including: a first substrate and a second substrate, one of which is transparent; a liquid crystal layer disposed between the first substrate and the second substrate; a group of electrodes for applying an electric field to the liquid crystal layer, which is formed on one of the first substrate and the second substrate; a plurality of active elements connected to the group of electrodes; and an alignment film disposed on one of the first substrate and the second substrate, wherein the alignment film contains a polyimide and a precursor of the polyimide, each of which is formed from a diamine and an acid anhydride, and the diamine contains a first diamine having an acidic group and a second diamine having a nitrogen atom-containing functional group other than two amino groups.

Abstract: A 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. The second alignment film has a thickness of at least 10 nm and no greater 50 nm and is thinner than the first alignment film.

Abstract: A liquid crystal display device includes a TFT substrate having a first alignment film formed on part of an inorganic insulating film, an overcoat film formed on a black matrix, a counter substrate having a second alignment film formed on the overcoat film, and a seal portion including a sealant. The TFT substrate is bonded to the counter substrate by the sealant. The sealant is bonded to the inorganic insulating film at the seal portion on the side where the TFT substrate is formed, with the first alignment film not being provided on the side, and, in the seal portion on the side where the counter substrate is formed, the sealant is bonded to the second alignment film but, is not bonded to the overcoat film.

Abstract: An IPS liquid crystal display device intended to prevent generation of second image sticking after generation of initial DC image sticking. An alignment film has a two-layer structure comprising an upper alignment film and a lower alignment film. The upper alignment film is an optical alignment film formed of a polyamide acid ester as a precursor. The lower alignment film has a lower resistance value than the upper alignment film and also has a low photoconductive property. The lower alignment film is formed not using, as a precursor, a polyamide acid using PMDA as the starting material but using, as a precursor, the polyamide acid containing a sulfonic acid group or a carboxylic group, whereby the difference of the resistance between portions undergoing or not undergoing light irradiation in the pixel is decreased and generation of second image sticking can be prevented.

Abstract: The present invention relates to a method of manufacturing a liquid crystal display device having a TFT substrate and a counter substrate, and prevents brightness unevenness from being caused by orientation film thickness unevenness. Orientation films for the TFT substrate 10 and the counter substrate 20 are formed by offset printing that is performed to transfer an orientation film material from a printing plate to the TFT substrate 10. The direction in which the printing plate for an offset printing machine rotates during offset printing is the long-axis direction of the TFT substrate 10 in the case of the TFT substrate 10 or the short-axis direction of the counter substrate in the case of the counter substrate. This ensures that brightness unevenness caused by orientation film thickness unevenness is inconspicuous even when the orientation film thickness unevenness is produced during offset printing.

Abstract: An organic solvent includes a photo decomposition type polyimide acid which forms an alignment film of a liquid crystal display device by radiation of a polarized light. A viscosity of the photo decomposition type polyimide acid is not more than 35 mPa·s.

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: Each pixel formed on a TFT substrate includes a pixel electrode, and a TFT, a color filter, an opposed electrode and an insulating film are interposed between the pixel electrode and the TFT substrate. A liquid crystal layer is interposed between the TFT substrate and an opposed substrate. An alignment film is provided on each surface of the TFT substrate and the opposed substrate, the each surface being in contact with the liquid crystal layer. A material with high photoconductivity is used for forming the alignment film so as to suppress DC afterimage. Meanwhile, each thickness of the color filter for the respective colors is changed for preventing a yellow shift resulting from absorption of high intensity of light with short wavelength by the alignment film.

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: This invention enables forming a photo-alignment film having a large LC anchoring strength in an IPS type liquid crystal display device. An alignment film is adapted to have a two-layer structure including a photo-alignment film and an alignment film with enhanced film strength. The photo-alignment film is formed of a precursor of polyamide acid ester, 80 percent or more of which is polyamide acid ester including cyclobutane. The alignment film with enhanced film strength is formed of a precursor of polyamide acid. After irradiating the substrate with ultraviolet light for photo-alignment, the substrate is heated. Thus, it is possible to achieve a high LC anchoring strength of the alignment film as the whole for photo-alignment, without degrading the mechanical strength of the alignment film with enhanced film strength.