Patents by Inventor Takeshi Itoi
Takeshi Itoi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
ORGANIC ELECTROLUMINESCENT ELEMENT, ORGANIC ELECTROLUMINESCENT DISPLAY APPARATUS, AND DIGITAL DEVICE
Publication number: 20240147843Abstract: An organic EL device includes an emitting region provided between a cathode and an anode, a first anode-side-organic layer, a second anode-side-organic layer, and a third anode-side-organic layer, in which the emitting region includes at least a first emitting layer, the first anode-side-organic layer is in direct contact with the second anode-side-organic layer, the second anode-side-organic layer is in direct contact with the third anode-side-organic layer, the third anode-side-organic layer has a film thickness of 20 nm or more, the second anode-side-organic layer contains at least one compound different from a compound contained in the third anode-side-organic layer, the first emitting layer is a fluorescent emitting layer, and a refractive index NM2 of a constituent material contained in the second anode-side-organic layer and a refractive index NM3 of a constituent material contained in the third anode-side-organic layer satisfy a relationship of Numerical Formula NM, NM2>NM3??(Numerical Formula NMType: ApplicationFiled: January 13, 2022Publication date: May 2, 2024Inventors: Satomi TASAKI, Kazuki NISHIMURA, Tetsuya MASUDA, Hiroaki TOYOSHIMA, Masato NAKAMURA, Hiroaki ITOI, Emiko KAMBE, Tasuku HAKETA, Yusuke TAKAHASHI, Keitaro YAMADA, Takeshi IKEDA -
Publication number: 20240130224Abstract: An organic electroluminescence device includes an emitting region between a cathode and an anode, a first anode side organic layer, and a second anode side organic layer. The emitting region includes at least a first emitting layer, the first anode side organic layer is in direct contact with the second anode side organic layer, the first anode side organic layer contains first and second organic materials, a content of the first organic material in the first anode side organic layer is less than 50 mass %, the second anode side organic layer contains a second hole transporting zone material, the first emitting layer is an emitting layer that emits fluorescence, and a refractive index NM1 of the constituent materials contained in the first anode side organic layer and a refractive index NM2 of the constituent material contained in the second anode side organic layer satisfy a relationship of NM1>NM2.Type: ApplicationFiled: December 24, 2021Publication date: April 18, 2024Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Hiroaki TOYOSHIMA, Kazuki NISHIMURA, Tetsuya MASUDA, Satomi TASAKI, Masato NAKAMURA, Hiroaki ITOI, Emiko KAMBE, Yusuke TAKAHASHI, Keitaro YAMADA, Takeshi IKEDA, Tasuku HAKETA
-
Patent number: 8642233Abstract: A method of a color filter substrate for a semitransmissive type liquid crystal display device, including: forming a photosensitive coloring composition layer containing a photo-polymerizable monomer, a resinous binder, a polymerization initiator, a coloring agent and a solvent on a surface of a transparent substrate, the surface being partitioned into a large number of pixel regions; exposing the photosensitive coloring composition layer to light; and developing the photosensitive coloring composition layer to form a transmissive portion and a reflective portion, the transmissive portion being assigned to colorize a transmitted light from a light source arranged on a rear surface side of a liquid crystal display device, the reflective portion being assigned to colorize a reflected light to be derived from reflection of an external light entering from the observer's side and having a through-hole with a diameter of 10 ?m or less.Type: GrantFiled: December 27, 2011Date of Patent: February 4, 2014Assignee: Toppan Printing Co., Ltd.Inventors: Mie Shimizu, Koichi Minato, Takeshi Itoi
-
Patent number: 8488098Abstract: A phase-type diffraction device includes a substrate having a front surface and a solidified liquid crystal layer formed on the front surface of the substrate and constituted by a continuous film containing at least a liquid crystal compound. The solidified liquid crystal layer is constituted by first, second and third regions arranged periodically, the third region being interposed between the first region and the second region. The first region is optically anisotropic and the second region is optically isotropic, the third region is not optically isotropic, a degree of orientation of mesogens of the liquid crystal compound being lower than that of the first region. An in-plane average refractive index ni of the second region is different from an in-plane average refractive index na of the first region and an in-plane average refractive index nm of the third region is between ni and na.Type: GrantFiled: August 18, 2011Date of Patent: July 16, 2013Assignee: Toppan Printing Co., Ltd.Inventors: Sosuke Akao, Takeshi Itoi
-
Patent number: 8350998Abstract: 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 5.0×10?4. A difference between the maximum and minimum values of the degrees of depolarization obtained for the regions is less than 2.0×10?4.Type: GrantFiled: February 14, 2011Date of Patent: January 8, 2013Assignee: Toppan Printing Co., Ltd.Inventors: Sosuke Akao, Yuji Kubo, Noritaka Mihashi, Godai Fukunaga, Masashi Aimatsu, Takeshi Itoi
-
Patent number: 8237894Abstract: A color filter includes a red filter segment, a green filter segment and a blue filter segment, on a substrate, wherein when a pseudo-white LED is used, an area of a triangle defined by three chromaticity points of the red, green and blue filter segments expressed as (xR, yR), (xG, yG) and (xB, yB) on the x-y chromaticity diagram occupies 72% or more of an area standard triangle defined by defined by 3 points of red (0.67, 0.33), green (0.21, 0.71) and blue (0.14, 0.08), and the color filter has a color temperature of 6000K or more. Each of the red, green and blue filter segments has a thickness of 3.3 ?m or less. A liquid crystal display device includes such color filter and the pseudo-white LED.Type: GrantFiled: April 3, 2009Date of Patent: August 7, 2012Assignees: Toyo Ink Mfg. Co., Ltd., Toppan Printing Co., Ltd.Inventors: Kazunori Yamada, Takashi Kanoh, Hideyo Tanaka, Yukino Miyagawa, Satoshi Ohkuma, Mie Shimizu, Takeshi Itoi
-
Publication number: 20120094221Abstract: A method of a color filter substrate for a semitransmissive type liquid crystal display device, including: forming a photosensitive coloring composition layer containing a photo-polymerizable monomer, a resinous binder, a polymerization initiator, a coloring agent and a solvent on a surface of a transparent substrate, the surface being partitioned into a large number of pixel regions; exposing the photosensitive coloring composition layer to light; and developing the photosensitive coloring composition layer to form a transmissive portion and a reflective portion, the transmissive portion being assigned to colorize a transmitted light from a light source arranged on a rear surface side of a liquid crystal display device, the reflective portion being assigned to colorize a reflected light to be derived from reflection of an external light entering from the observer's side and having a through-hole with a diameter of 10 pm or less.Type: ApplicationFiled: December 27, 2011Publication date: April 19, 2012Applicant: TOPPAN PRINTING CO., LTD.Inventors: Mie Shimizu, Koichi Minato, Takeshi Itoi
-
Publication number: 20110304782Abstract: A phase-type diffraction device includes a substrate having a front surface and a solidified liquid crystal layer formed on the front surface of the substrate and constituted by a continuous film containing at least a liquid crystal compound. The solidified liquid crystal layer is constituted by first, second and third regions arranged periodically, the third region being interposed between the first region and the second region. The first region is optically anisotropic and the second region is optically isotropic, the third region is not optically isotropic, a degree of orientation of mesogens of the liquid crystal compound being lower than that of the first region. An in-plane average refractive index ni of the second region is different from an in-plane average refractive index na of the first region and an in-plane average refractive index nm of the third region is between ni and na.Type: ApplicationFiled: August 18, 2011Publication date: December 15, 2011Applicant: TOPPAN PRINTING CO., LTD.Inventors: Sosuke Akao, Takeshi Itoi
-
Publication number: 20110285956Abstract: A phase-type diffraction device is provided, which includes a transparent substrate having a front surface and a rear surface, and a solidified liquid crystal layer formed on the front surface of the transparent substrate and constituted by a continuous film includes at least a liquid crystal compound. The solidified liquid crystal layer is constituted by first and second regions arranged periodically. The first region is optically anisotropic and the second region is optically isotropic. The first region differs in in-plane average refractive index from the second region.Type: ApplicationFiled: July 29, 2011Publication date: November 24, 2011Applicant: TOPPAN PRINTING CO., LTD.Inventors: Sosuke Akao, Takeshi Itoi
-
Patent number: 8049844Abstract: A color filter includes red, green and blue filter segments and is adapted to be used in a liquid crystal display device using, as a light source, a white LED having specified spectral properties. The red filter segment has a 50% transmittance wavelength within a range of 595 to 610 nm and a transmittance of 85% or more at a wavelength of 630 nm. The blue filter segment has a maximum transmittance wavelength of 455 nm or less and a transmittance of 55% or more at a wavelength of 450 nm. A thickness of each of the red, green and blue filter segments is 3.0 ?m or less. A liquid crystal display device including this color filter and the white LED is also disclosed.Type: GrantFiled: August 29, 2008Date of Patent: November 1, 2011Assignees: Toyo Ink Mfg. Co., Ltd., Toppan Printing Co., Ltd.Inventors: Satoshi Okutsu, Kenro Sunahara, Atsushi Nishida, Yukino Miyagawa, Tomoyuki Kadowaki, Mie Shimizu, Takeshi Itoi, Koichi Minato
-
Patent number: 7965353Abstract: A color filter comprising a substrate, a red pixel, green pixel and blue pixel, each being disposed on the substrate, wherein a perpendicular optical retardation RRth of the red pixel, a perpendicular optical retardation GRth of the green pixel, and a perpendicular optical retardation BRth of the blue pixel satisfy the following formulas (1) and (2): |(RRth?BRth)|?|(GRth?BRth)|?0??(1) |(RRth?BRth)|?|(RRth?GRth)|?0??(2) wherein RRth, GRth and BRth represent, respectively, a product of a thickness [nm] of a pixel and a value obtained by subtracting a value of thickness-wise refractive index from an average value of an in-plane refractive index of each of these pixels.Type: GrantFiled: December 19, 2007Date of Patent: June 21, 2011Assignee: Toppan Printing Co., Ltd.Inventors: Sosuke Akao, Koichi Minato, Satoshi Ohkuma, Yoshinori Nagasaki, Takeshi Itoi, Mitsuhisa Hatashima
-
Publication number: 20110141407Abstract: 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 5.0×10?4. A difference between the maximum and minimum values of the degrees of depolarization obtained for the regions is less than 2.0×10?4.Type: ApplicationFiled: February 14, 2011Publication date: June 16, 2011Applicant: TOPPAN PRINTING CO., LTD.Inventors: Sosuke Akao, Yuji Kubo, Noritaka Mihashi, Godai Fukunaga, Masashi Aimatsu, Takeshi Itoi
-
Patent number: 7948623Abstract: A method of evaluating a color filter including a substrate, and at least three color pixels disposed thereon, the method includes determining an oblique visibility of a liquid crystal display device equipped with the color filter on the basis of value ?1 obtained from the equation (1): ?1=?ab?(?)·T(?)d???(1) wherein “a” and “b” are values respectively representing a wavelength range of a continuous wavelength light and satisfying conditions of 380?a, b?780 and a<b; ?(?) represents an optical retardation obtained by irradiating each of color pixels with a continuous wavelength light containing light components with wavelength ? falling within a range of 380 nm to 780 nm at an incident angle, and subjecting the transmitted light to measurement using a spectroscopic ellipsometer, and T(?) represents a spectral transmittance of the color pixels measured at the wavelength ? falling within a range of 380 nm-780 nm.Type: GrantFiled: June 18, 2009Date of Patent: May 24, 2011Assignees: Toppan Printing Co., Ltd., Tokyo Ink Mfg. Co., Ltd.Inventors: Koichi Minato, Takeshi Itoi, Sosuke Akao, Hidesato Hagiwara, Masayuki Yamamoto, Yuki Saito
-
Patent number: 7763672Abstract: A red-colored film in which when an elliptically polarized light is incident on the film in a direction 45° aslant from a normal line direction with respect to a surface of the film, a light transmitted through the film has an average amplitude transmittance ratio (av. tan ?) in a wavelength region of 575 to 635 nm, which satisfies the following equation (1): 0.960<av. tan ?<1.040??(1). A red-colored composition contains a red pigment A having a BET specific surface area in the range from 90 to 140 m2/g, a red pigment B having a BET specific surface area in the range from 70 to 85 m2/g, and a pigment carrier formed of a transparent resin, a precursor of the transparent resin or a mixture of the tarns parent resin and precursor thereof. A color filter has the red-colored film as a red color filter segment. The liquid crystal display device includes the color filter.Type: GrantFiled: June 29, 2006Date of Patent: July 27, 2010Assignees: Toyo Ink Mfg. Co., Ltd., Toppan Printing Co., Ltd.Inventors: Masayuki Yamamoto, Akira Hirano, Hideyo Tanaka, Yusuke Iida, Satoshi Ohkuma, Koichi Minato, Takeshi Itoi, Hidesato Hagiwara
-
Patent number: 7750068Abstract: A colored composition for color filter contains a pigment carrier made of a transparent resin, a precursor thereof, or a mixture thereof, an organic pigment, and a pigment-dispersing agent containing a quinoline derivative having a formula as described in the specification or an amine or metal salt. The color filter contains filter segments formed with the color composition.Type: GrantFiled: February 22, 2005Date of Patent: July 6, 2010Assignee: Toppan Printing Co., Ltd.Inventors: Atsushi Nishida, Toru Omura, Takashi Yamauchi, Takeshi Itoi
-
Publication number: 20090257007Abstract: A method of evaluating a color filter including a substrate, and at least three color pixels disposed thereon, the method includes determining an oblique visibility of a liquid crystal display device equipped with the color filter on the basis of value ?1 obtained from the equation (1): ?1=?ab?(?)·T(?)d???(1) wherein “a” and “b” are values respectively representing a wavelength range of a continuous wavelength light and satisfying conditions of 380?a, b?780 and a<b; ?(?) represents an optical retardation obtained by irradiating each of color pixels with a continuous wavelength light containing light components with wavelength ? falling within a range of 380 nm to 780 nm at an incident angle, and subjecting the transmitted light to measurement using a spectroscopic ellipsometer, and T(?) represents a spectral transmittance of the color pixels measured at the wavelength ? falling within a range of 380 nm-780 nm.Type: ApplicationFiled: June 18, 2009Publication date: October 15, 2009Applicants: TOPPAN PRINTING CO., LTD., TOYO INK MFG. CO., LTD.Inventors: Koichi Minato, Takeshi Itoi, Sosuke Akao, Hidesato Hagiwara, Masayuki Yamamoto, Yuki Saito
-
Publication number: 20090190064Abstract: A color filter includes a red filter segment, a green filter segment and a blue filter segment, on a substrate, wherein when a pseudo-white LED is used, an area of a triangle defined by three chromaticity points of the red, green and blue filter segments expressed as (xR, yR), (xG, yG) and (xB, yB) on the x-y chromaticity diagram occupies 72% or more of an area standard triangle defined by defined by 3 points of red (0.67, 0.33), green (0.21, 0.71) and blue (0.14, 0.08), and the color filter has a color temperature of 6000K or more. Each of the red, green and blue filter segments has a thickness of 3.3 ?m or less. A liquid crystal display device includes such color filter and the pseudo-white LED.Type: ApplicationFiled: April 3, 2009Publication date: July 30, 2009Inventors: Kazunori YAMADA, Takashi Kanoh, Hideyo Tanaka, Yukino Miyagawa, Satoshi Ohkuma, Mie Shimizu, Takeshi Itoi
-
Publication number: 20090002858Abstract: A color filter includes red, green and blue filter segments and is adapted to be used in a liquid crystal display device using, as a light source, a white LED having specified spectral properties. The red filter segment has a 50% transmittance wavelength within a range of 595 to 610 nm and a transmittance of 85% or more at a wavelength of 630 nm. The blue filter segment has a maximum transmittance wavelength of 455 nm or less and a transmittance of 55% or more at a wavelength of 450 nm. A thickness of each of the red, green and blue filter segments is 3.0 ?m or less. A liquid crystal display device including this color filter and the white LED is also disclosed.Type: ApplicationFiled: August 29, 2008Publication date: January 1, 2009Inventors: Satoshi Okutsu, Kenro Sunahara, Atsushi Nishida, Yukino Miyagawa, Tomoyuki Kadowaki, Mie Shimizu, Takeshi Itoi, Koichi Minato
-
Patent number: 7420632Abstract: A color filter is provided with red, green and blue color filter segments. When chromaticity coordinates (x, y) in a chromaticity diagram of XYZ color specification system are measured with the color filter being sandwiched between two polarizers, a chromaticity (xp, yp) of parallel-transmitted light and a chromaticity (xc, yc) of orthogonal-transmitted light satisfy the following formula (1): ?xy=[(xp?xc)2+(yp?yc)2]1/2<0.130??(1) A liquid crystal display device is provided with such a color filter.Type: GrantFiled: March 31, 2005Date of Patent: September 2, 2008Assignees: Toyo Ink Mfg. Co., Ltd., Toppan Printing Co., Ltd.Inventors: Hideyo Tanaka, Hidesato Hagiwara, Takeshi Itoi, Takumi Saito, Koichi Minato
-
Publication number: 20080170187Abstract: A photosensitive coloring composition including a photo-polymerizable monomer, a resinous binder, a polymerization initiator, a coloring agent and a solvent, and having an exposure sensitivity property in which ? (=tan ?) is confined to 1.33 or more and a residual rate of a film of the photosensitive coloring composition after development is 0% at an exposure dose of not more than 23% of the minimum exposure dose that makes the residual rate of the film not lower than 85%, when a rising angle of an exposure sensitivity curve is defined as ? in the exposure sensitivity curve to be derived by plotting exposure sensitivity in coordinates with an abscissa thereof representing common logarithm of the exposure dose and with an ordinate thereof representing the residual rate of the film after development.Type: ApplicationFiled: February 29, 2008Publication date: July 17, 2008Applicant: TOPPAN PRINTING CO., LTD.Inventors: Mie Shimizu, Koichi Minato, Takeshi Itoi