Patents by Inventor Munekazu Date
Munekazu Date 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).
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Publication number: 20230237943Abstract: An image display device (1) according to the present disclosure includes an image display unit (2) that has a pixel structure of subpixels having a plurality of colors, in which the subpixels having different colors are aligned in a first direction, and the subpixels having the same color are aligned in a second direction perpendicular to the first direction and causes an observer ob to observe an image through a plurality of opening portions (24) disposed for each pixel block BL including a plurality of pixels including the subpixels having the plurality of colors. A width of each of the plurality of opening portions (24) in the first direction is substantially equal to a width of a subpixel of the subpixels in the first direction, and the plurality of opening portions (24) are disposed to be shifted in the first direction.Type: ApplicationFiled: March 6, 2020Publication date: July 27, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu DATE, Shinya SHIMIZU, Takasuke NAGAI, Dan MIKAMI, Yoshinori KUSACHI
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Patent number: 11557262Abstract: A display device which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape that has been smoothed to reduce a number of corners in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.Type: GrantFiled: October 1, 2021Date of Patent: January 17, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu Date, Megumi Isogai, Hideaki Kimata
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Publication number: 20220394183Abstract: A camera parameter derivation apparatus for deriving camera parameters of a plurality of cameras for which conditions that the cameras be arranged at ideal positions that are set on a straight line at equal intervals and that directions of all arranged cameras be parallel to each other have been set includes an internal parameter derivation unit that derives internal parameter matrices of the cameras based on estimated internal parameter matrices for all cameras that are arranged at estimated positions while being oriented in estimated directions, a camera position derivation unit that derives ideal positions of the cameras that minimize the maximum of the distances between the estimated positions and the ideal positions, and a rotation matrix derivation unit that derives rotation matrices for correcting external parameters such that errors from parallel directions are equal to or less than a threshold value.Type: ApplicationFiled: November 25, 2019Publication date: December 8, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takasuke NAGAI, Munekazu DATE, Shinya SHIMIZU, Hideaki KIMATA
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Patent number: 11487154Abstract: Light having high directivity and high uniformity is emitted. A light source apparatus (10) according to the present invention includes: a light emitting body group (11a) in which a plurality of light sources (11) that emit directional light are arranged on one surface; and a first visual field limiting film (12) that is provided on an optical path of the light emitted from the plurality of light sources (11), and outputs light that enters the first visual field limiting film in a first predetermined angular range by homogeneously diffusing the light within the first predetermined angular range.Type: GrantFiled: October 28, 2019Date of Patent: November 1, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu Date, Megumi Isogai, Hideaki Kimata
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Patent number: 11322102Abstract: A display device and a display method which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.Type: GrantFiled: June 21, 2019Date of Patent: May 3, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu Date, Megumi Isogai, Hideaki Kimata
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Publication number: 20220068231Abstract: A display device which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape that has been smoothed to reduce a number of corners in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.Type: ApplicationFiled: October 1, 2021Publication date: March 3, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu DATE, Megumi ISOGAI, Hideaki KIMATA
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Publication number: 20210341792Abstract: Light having high directivity and high uniformity is emitted. A light source apparatus (10) according to the present invention includes: a light emitting body group (11a) in which a plurality of light sources (11) that emit directional light are arranged on one surface; and a first visual field limiting film (12) that is provided on an optical path of the light emitted from the plurality of light sources (11), and outputs light that enters the first visual field limiting film in a first predetermined angular range by homogeneously diffusing the light within the first predetermined angular range.Type: ApplicationFiled: October 28, 2019Publication date: November 4, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu DATE, Megumi ISOGAI, Hideaki KIMATA
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Publication number: 20210280145Abstract: A display device and a display method which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.Type: ApplicationFiled: June 21, 2019Publication date: September 9, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munekazu DATE, Megumi ISOGAI, Hideaki KIMATA
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Patent number: 8576141Abstract: A three-dimensional display device includes a plurality of transmissive display units arranged in different depth positions in view from an observer and a moiré vanishing element for diffusing light. The moiré vanishing element has a spatial frequency characteristic to cut off a spatial frequency more than a spatial frequency having a cycle being twice as large as an interval of boundaries of pixels forming a first transmissive display unit arranged behind the moiré vanishing element in the view from the observer.Type: GrantFiled: December 13, 2006Date of Patent: November 5, 2013Assignee: Nippon Telegraph and Telephone CorporationInventors: Hideaki Takada, Munekazu Date, Shiro Suyama, Masahiro Ueno
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Publication number: 20090079662Abstract: A three-dimensional display device includes a plurality of transmissive display units arranged in different depth positions in view from an observer and a moiré vanishing element for diffusing light. The moiré vanishing element has a spatial frequency characteristic to cut off a spatial frequency more than a spatial frequency having a cycle being twice as large as an interval of boundaries of pixels forming a first transmissive display unit arranged behind the moiré vanishing element in the view from the observer.Type: ApplicationFiled: December 13, 2006Publication date: March 26, 2009Applicant: Nippon Telegraph and Telephone CorporationInventors: Hideaki Takada, Munekazu Date, Shiro Suyama, Masahiro Ueno
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Patent number: 7336244Abstract: An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f1 and f2 between the transparent electrodes. The difference ?? in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.Type: GrantFiled: February 23, 2004Date of Patent: February 26, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Shiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai
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Patent number: 7209097Abstract: An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f1 and f2 between the transparent electrodes. The difference ?? in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.Type: GrantFiled: February 23, 2004Date of Patent: April 24, 2007Assignee: Nippon Telegraph and Telephone CorporationInventors: Shiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai
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Patent number: 6836314Abstract: An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a first electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. There is an optical control layer which changes in scattering degree or diffraction efficiency by an electric field applied by said first electrode and said second electrode.Type: GrantFiled: July 8, 2003Date of Patent: December 28, 2004Assignee: Nippon Telegraph and Telephone CorporationInventors: Munekazu Date, Shiro Suyama, Kinya Kato, Kazutake Uehira
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Patent number: 6819393Abstract: An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a first electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. At least one of said first electrode and said second electrode has a periodic structure for inducing a fine periodic structure for light diffraction in said optical control layer.Type: GrantFiled: July 8, 2003Date of Patent: November 16, 2004Assignee: Nippon Telegraph and Telephone CorporationInventors: Munekazu Date, Shiro Suyama, Kinya Kato, Kazutake Uehira
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Publication number: 20040164927Abstract: An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy and having a property in which a sign of a difference &Dgr;&egr; in dielectric constant due to the anisotropy is reversed at driving frequencies f1 and f2, at least two transparent electrodes arranged to sandwich the transparent material layer and the layer including the variable refractive index material, and a driving device supplying a voltage including the driving frequencies f1 and f2 between the transparent electrodes.Type: ApplicationFiled: February 23, 2004Publication date: August 26, 2004Applicant: Nippon Telegraph And Telephone CorporationInventors: Shiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai
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Publication number: 20040160389Abstract: An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f1 and f2 between the transparent electrodes. The difference &Dgr;&egr; in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.Type: ApplicationFiled: February 23, 2004Publication date: August 19, 2004Applicant: Nippon Telegraph And Telephone CorporationInventors: Shiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai
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Publication number: 20040095524Abstract: An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a fist electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. A plurality of third electrodes are provided through the substrate. Each of the third electrode has a first end part connecting to the second electrode and a second end part exposed to the other side of the substrate. A further light absorption film may be disposed between the reflection film and the second electrode.Type: ApplicationFiled: July 8, 2003Publication date: May 20, 2004Applicant: Nippon Telegraph and Telephone CorporationInventors: Munekazu Date, Shiro Suyama, Kinya Kato, Kazutake Uehira
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Patent number: 6714174Abstract: An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f1 and f2 between the transparent electrodes. The difference &Dgr;∈ in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.Type: GrantFiled: December 11, 2001Date of Patent: March 30, 2004Assignee: Nippon Telegraph and Telephone CorporationInventors: Shiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai
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Patent number: 6618104Abstract: An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a fist electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. A plurality of third electrodes are provided through the substrate. Each of the third electrode has a first end part connecting to the second electrode and a second end part exposed to the other side of the substrate. A further light absorption film may be disposed between the reflection film and the second electrode.Type: GrantFiled: July 27, 1999Date of Patent: September 9, 2003Assignee: Nippon Telegraph and Telephone CorporationInventors: Munekazu Date, Shiro Suyama, Kinya Kato, Kazutake Uehira
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Patent number: 6469683Abstract: An optical device includes a transparent layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f1 and f2 between the transparent electrodes. The difference &Dgr;∈ in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the driving frequency.Type: GrantFiled: January 16, 1997Date of Patent: October 22, 2002Assignee: Nippon Telegraph and Telephone CorporationInventors: Shiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai