Patent application number | Description | Published |
20080204647 | LIQUID CRYSTAL DISPLAY DEVICE - The present invention provides a liquid crystal display device which can decrease lowering of light utilization efficiency attributed to a light absorption axis of an alignment film. A liquid crystal display device includes a liquid crystal display panel and a backlight arranged on a back surface of the liquid crystal display panel. The liquid crystal display panel includes liquid crystal, and a first substrate and a second substrate arranged to face each other in an opposed manner with the liquid crystal therebetween. The first substrate is arranged between the second substrate and the backlight. The first substrate includes a first polarizer and a first alignment film arranged between the first polarizer and the liquid crystal. The second substrate includes a second polarizer and a second alignment film arranged between the second polarizer and the liquid crystal. The second alignment film has a light absorption axis, and an angle made by the light absorption axis of the second alignment film and a light absorption axis of the second polarizer is set to a value which falls within ±1°. The first alignment film has a light absorption axis, and an angle made by the light absorption axis of the first alignment film and a light absorption axis of the first polarizer is set to a value not less than 89° and not more than 91°. (degree of polarization of the first alignment film)/(degree of polarization of the second alignment film) is set to a value not more than 0.9. | 08-28-2008 |
20090289260 | LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF MANUFACTURING THAT - 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. The first alignment film is made of a photo-decomposition-type alignment film material. | 11-26-2009 |
20100060836 | LIQUID CRYSTAL DISPLAY DEVICE - 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 Δε 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 Δε of the liquid crystals to 5 or less, thereby capable of preventing the image retention phenomenon and the black unevenness. | 03-11-2010 |
20100066961 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 03-18-2010 |
20100201933 | LIQUID CRYSTAL DISPLAY DEVICE - 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. When the TFT substrate or the counter substrate receives a pressing force from the outside, the projections bite into a distal end of the columnar spacer so that the displacement of the columnar spacer in one or more directions can be prevented. | 08-12-2010 |
20110007233 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 01-13-2011 |
20110080548 | Liquid Crystal Display Device And Method Of Manufacturing That - 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. | 04-07-2011 |
20110096277 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 04-28-2011 |
20110115999 | LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - 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. | 05-19-2011 |
20110116027 | LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - 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. The second alignment film is thinner than the first alignment film, and has a thickness of equal to or greater than 10 nm and equal to or less than 50 nm. | 05-19-2011 |
20110199565 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 08-18-2011 |
20110273649 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 11-10-2011 |
20120004453 | Liquid Crystal Display Device And Method Of Manufacturing That - 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. | 01-05-2012 |
20120057115 | LIQUID CRYSTAL DISPLAY DEVICE - An IPS liquid crystal display device intended to prevent generation of second image sticking after generation of initial DC image sticking. | 03-08-2012 |
20120075559 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 03-29-2012 |
20120081647 | Liquid Crystal Display Device And Manufacturing Method Thereof - 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. | 04-05-2012 |
20120300145 | LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF MANUFACTURING THAT - 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. | 11-29-2012 |
20120304891 | Liquid Crystal Display Device and Method of Manufacturing That - 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. | 12-06-2012 |
20130114031 | Liquid Crystal Display Device and Manufacturing Method Thereof - 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. | 05-09-2013 |
20130215353 | LIQUID CRYSTAL DISPLAY DEVICE - In a liquid crystal display device, a light shielding film, a 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 color filter is disposed below the overcoat film to block the moisture. | 08-22-2013 |
20130242246 | Liquid Crystal Display Device and Method of Manufacturing That - A liquid crystal display device including a first substrate, a first alignment film formed over the first substrate, a second substrate, a second alignment film formed over the second substrate, a liquid crystal layer sandwiched between the first alignment film and the second alignment film, and a projecting portion formed over the second substrate. The first and second alignment films are both made of a photo-decomposition-type material. A film thickness “d2” of the second alignment film over the projecting portion and a film thickness “d1” of a portion of the first alignment film facing the projecting portion satisfy a formula (1) and a formula (2): | 09-19-2013 |
20130286333 | LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - 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. | 10-31-2013 |
20130300967 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 11-14-2013 |
20140144582 | Liquid Crystal Display Device - A method for fabricating a liquid crystal display device having a TFT substrate in which an alignment film is formed over a pixel including a pixel electrode and a TFT, an opposing substrate which faces the TFT substrate, and liquid crystals sandwiched between the TFT substrate and the opposing substrate, the alignment film on the TFT substrate including a first and a second alignment film. The method includes depositing a mixture liquid of polyamide acid ester, 80 percent or more of which is polyamide acid ester including cyclobutane, and polyamide acid not including cyclobutane onto the TFT substrate and the opposing substrate, and after drying and firing the TFT substrate and the opposing substrate to harden the alignment film, irradiating the alignment film with ultraviolet light for photo-alignment of the alignment film and, thereafter, heating the TFT substrate and the opposing substrate, thereby forming the alignment film. | 05-29-2014 |
20140220848 | LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - 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. | 08-07-2014 |
20140267992 | Liquid Crystal Display Device and Method of Manufacturing That - A liquid crystal display device includes a first substrate, a first alignment film formed over the first substrate, a second substrate, a second alignment film formed over the second substrate, a liquid crystal layer sandwiched between the first alignment film and the second alignment film, and a projecting portion formed over the second substrate. The first alignment film is a photo alignment film, and a thickness “d2” of the second alignment film over the projecting portion and a film thickness “d1” of a portion of the first alignment film facing the projecting portion satisfy formula (1) and (2): | 09-18-2014 |
20150049271 | LIQUID CRYSTAL DISPLAY DEVICE - 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. | 02-19-2015 |