Patents by Inventor Takashi Toyooka
Takashi Toyooka 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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Patent number: 7649574Abstract: An image display method of splitting a frame into a plurality of sub frames by multiplying a frame frequency of an incoming image signal by an integer, and dividing an image that is originally for the frame into pieces for display on the sub frames. In the image display method, the luminance component included in the image is given a priority for display on a first sub frame that is at least one of the sub frames, and a color-difference component included in the image is given a priority for display on a second sub frame that is also one of the sub frames but not the first sub frame.Type: GrantFiled: December 8, 2005Date of Patent: January 19, 2010Assignee: Seiko Epson CorporationInventor: Takashi Toyooka
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Publication number: 20090207186Abstract: An image display method includes dividing one frame into a plurality of sub-frames by multiplying a frame frequency of an input image signal, reducing a high-spatial frequency component of an image signal which is used for image display in at least one predetermined sub-frame among the plurality of sub-frames in comparison with that of an image signal which is used for image display in another sub-frame, and displaying an image in each sub-frame.Type: ApplicationFiled: April 16, 2009Publication date: August 20, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Takashi Toyooka, Shohei Yoshida
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Publication number: 20090189922Abstract: An image display apparatus includes a light-source driving circuit that drives a light source to cyclically change brightness. A control unit controls a pixel to turn on and off over a plurality of subfields in a field so that transmittance or reflectance in the pixel over the plurality of subfields in the field corresponds to a gray level specified for the pixel. The control unit also arranges the plurality of subfields such that two or more gray-level defining subfields maintain a predetermined relationship with respect to the cyclical change in brightness of the light source caused by drive of a light-source driving circuit.Type: ApplicationFiled: January 16, 2009Publication date: July 30, 2009Applicant: Seiko Epson CorporationInventor: Takashi TOYOOKA
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Publication number: 20090189845Abstract: An image display device includes at least one light source that emits light; at least one display area that changes, for each pixel, a transmittance or a reflectance of the light emitted from the light source; a panel driving circuit that drives the display area on the basis of an image signal indicating the transmittance or the reflectance for each pixel; and a light source control unit that controls a proportion of a light emission time of the light source in a period that varies within a predetermined range.Type: ApplicationFiled: January 16, 2009Publication date: July 30, 2009Applicant: Seiko Epson CorporationInventor: Takashi Toyooka
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Patent number: 7542619Abstract: An image display method includes dividing one frame into a plurality of sub-frames by multiplying a frame frequency of an input image signal, reducing a high-spatial frequency component of an image signal which is used for image display in at least one predetermined sub-frame among the plurality of sub-frames in comparison with that of an image signal which is used for image display in another sub-frame, and displaying an image in each sub-frame.Type: GrantFiled: December 1, 2005Date of Patent: June 2, 2009Assignee: Seiko Epson CorporationInventors: Takashi Toyooka, Shohei Yoshida
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Publication number: 20090015525Abstract: Light having a color component that corresponds to a present field is irradiated on a plurality of pixels for a time duration that starts during the scan period of the present field and that ends during the scan period of a next field that is subsequent to the present field.Type: ApplicationFiled: July 8, 2008Publication date: January 15, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Hiroyuki HOSAKA, Takashi TOYOOKA
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Patent number: 7466499Abstract: A projector with a light source device; an optical modulator for modulating a light beam irradiated by the light source device; a projection optical device for projecting the light beam modulated by the optical modulator in an enlarged manner; and an exterior casing for housing the light source device, the optical modulator, and the projection optical device, includes: an optical diaphragm disposed on an optical path between the light source device and the optical modulator, the optical diaphragm having a light shield for shielding at least a part of an incident light beam, the optical diaphragm adjusting light quantity of a light beam irradiated by the light source device by moving the light shield into and out of the optical path; a nonvisible light eliminator disposed on the downstream of the optical diaphragm on the optical path, the nonvisible light eliminator reflecting or transmitting a light beam in the nonvisible light region of the light beam irradiated by the light source device to guide the lightType: GrantFiled: August 14, 2006Date of Patent: December 16, 2008Assignee: Seiko Epson CorporationInventors: Kesatoshi Takeuchi, Hidehito Iisaka, Takashi Toyooka
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Publication number: 20080297877Abstract: An image display device having an optical modulation element, which modulates light emitted from a light source according to display information, and displaying a display image based on the display information includes: a unit adjusting the amount of illumination light with respect to light emitted from the light source on the basis of brightness information on the brightness of the display image based on the display information; a color conversion processing unit that performs a color conversion process according to the brightness information with respect to the display information so that the display image can be color-reproduced within a predetermined color space; and a display and driving unit that drives the optical modulation element on the basis of the display information having been subjected to the color conversion process so as to display the display image.Type: ApplicationFiled: June 13, 2008Publication date: December 4, 2008Applicant: Seiko Epson CorporationInventors: Yasunaga Miyazawa, Hiroshi Hasegawa, Hidehito Iisaka, Hidehiro Akahane, Takashi Toyooka
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Publication number: 20080291520Abstract: An image display device having an optical modulation element, which modulates light emitted from a light source according to display information, and displaying a display image based on the display information includes: a unit adjusting the amount of illumination light with respect to light emitted from the light source on the basis of brightness information on the brightness of the display image based on the display information; a color conversion processing unit that performs a color conversion process according to the brightness information with respect to the display information so that the display image can be color-reproduced within a predetermined color space; and a display and driving unit that drives the optical modulation element on the basis of the display information having been subjected to the color conversion process so as to display the display image.Type: ApplicationFiled: June 13, 2008Publication date: November 27, 2008Applicant: Seiko Epson CorporationInventors: Yasunaga Miyazawa, Hiroshi Hasegawa, Hidehito Iisaka, Hidehiro Akahane, Takashi Toyooka
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Publication number: 20080284717Abstract: An electro-optical device includes a liquid crystal drive unit that divides on a temporal axis one field into subfields and that, during the subfields, applies either an on-voltage or an off-voltage to picture elements of a liquid crystal display in accordance with gradation of the picture elements during the one field. A light source control unit sequentially switches the three light sources, and switches at least two of the three light sources at a switching period that is shorter than a time duration required to exhibit, in the picture elements during the one field, gradation of each color corresponding to each of the at least two of the three light sources.Type: ApplicationFiled: April 22, 2008Publication date: November 20, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Takashi TOYOOKA, Hiroyuki Hosaka
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Patent number: 7403318Abstract: An image display device having an optical modulation element, which modulates light emitted from a light source according to display information, and displaying a display image based on the display information includes: a unit adjusting the amount of illumination light with respect to light emitted from the light source on the basis of brightness information on the brightness of the display image based on the display information; a color conversion processing unit that performs a color conversion process according to the brightness information with respect to the display information so that the display image can be color-reproduced within a predetermined color space; and a display and driving unit that drives the optical modulation element on the basis of the display information having been subjected to the color conversion process so as to display the display image.Type: GrantFiled: March 27, 2006Date of Patent: July 22, 2008Assignee: Seiko Epson CorporationInventors: Yasunaga Miyazawa, Hiroshi Hasegawa, Hidehito Iisaka, Hidehiro Akahane, Takashi Toyooka
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Publication number: 20080088914Abstract: An illumination device includes: a light source section emitting coherent light; and a phase modulation section onto which the coherent light emitted from the light source section is incident, modulating the phase of the coherent light, forming a phase modulation pattern, varying the phase of the coherent light while generating a diffracted light in accordance with the phase modulation pattern, thereby scanning the light onto at least a part of a region of a projection surface.Type: ApplicationFiled: September 27, 2007Publication date: April 17, 2008Applicant: SEIKO EPSON CORPORATIONInventor: Takashi Toyooka
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Publication number: 20080084510Abstract: Display an image by adjusting upper limit of brightness of the image projection light. Here, determine the target value, according to analysis result of the image data, for the detected brightness of the image projection light, and adjust the upper limit of brightness of the image projection light to cause the detected brightness to approach the target value.Type: ApplicationFiled: October 1, 2007Publication date: April 10, 2008Applicant: SEIKO EPSON CORPORATIONInventor: Takashi Toyooka
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Publication number: 20080030629Abstract: The invention provides an image display method of displaying an image on a projection plane in response to an input video signal. The method includes steps of: emitting each of multiple color lights having mutually different hues; modulating the each of the multiple color lights; controlling light emission amounts of the multiple color lights individually, based on an analyzed result of the video signal; and correcting tone values of the video signal to generate a driving signal, for providing the modulation. The tone values are corrected such that a plurality of luminance profiles of the multiple color lights approximate each other, the plurality of luminance profiles being varied independently by individually controlling the amounts of light emission, each of the plurality of luminance profiles representing a relation between the tone value and relative luminance value for each of the modulated multiple color light.Type: ApplicationFiled: July 30, 2007Publication date: February 7, 2008Applicant: SEIKO EPSON CORPORATIONInventor: Takashi Toyooka
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Publication number: 20080007662Abstract: A projector includes a light source unit that supplies light, and a spatial light modulator that modulates light supplied from the light source unit according to an image signal. The spatial light modulator is driven by an applied voltage whose polarity is reversed according to a polarity-reversing frequency which is specific to the spatial light modulator. The light source unit supplies light which is modulated according to pulse width modulation for which fundamental frequency is set based on the polarity-reversing frequency.Type: ApplicationFiled: June 14, 2007Publication date: January 10, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Takashi Toyooka, Hiroyuki Hosaka
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Publication number: 20070273628Abstract: An electro-optical device includes a display unit that has a plurality of pixel portions constituting a display area on a substrate and an image signal processing. The image signal processing circuit generates an image signal that sets a first subframe frame luminance of the pixel portion in a first subframe and sets a second subframe luminance of the pixel portion in a second subframe. The first subframe and the second subframe are obtained by partitioning a first frame of a first frame image signal. The first frame has a frame luminance. The first subframe luminance is higher than the frame luminance and the second subframe luminance is lower than the frame luminance.Type: ApplicationFiled: May 23, 2007Publication date: November 29, 2007Applicant: SEIKO EPSON CORPORATIONInventors: Shigemi SATO, Hidehito IISAKA, Hiroyuki HOSAKA, Takashi TOYOOKA
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Publication number: 20070086075Abstract: A projector with a light source device; an optical modulator for modulating a light beam irradiated by the light source device; a projection optical device for projecting the light beam modulated by the optical modulator in an enlarged manner; and an exterior casing for housing the light source device, the optical modulator, and the projection optical device, includes: an optical diaphragm disposed on an optical path between the light source device and the optical modulator, the optical diaphragm having a light shield for shielding at least a part of an incident light beam, the optical diaphragm adjusting light quantity of a light beam irradiated by the light source device by moving the light shield into and out of the optical path; a nonvisible light eliminator disposed on the downstream of the optical diaphragm on the optical path, the nonvisible light eliminator reflecting or transmitting a light beam in the nonvisible light region of the light beam irradiated by the light source device to guide the lightType: ApplicationFiled: August 14, 2006Publication date: April 19, 2007Applicant: SEIKO EPSON CORPORATIONInventors: Kesatoshi Takeuchi, Hidehito Iisaka, Takashi Toyooka
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Publication number: 20070079959Abstract: A cooling device that cools a heat generator generating heat in response to application or a signal based on a predetermined signal via a cooling fluid includes a cooling fluid cooling section that cools the cooling fluid, a control section that controls the cooling fluid cooling section in accordance with a signal based on the predetermined signal, and a signal processing section that supplies the heat generator with the signal based on the predetermined signal relatively late, and supplies the control section with the signal based on the predetermined signal relatively early.Type: ApplicationFiled: October 6, 2006Publication date: April 12, 2007Applicant: SEIKO EPSON CORPORATIONInventors: Takeshi SETO, Takashi TOYOOKA
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Publication number: 20060285025Abstract: An image display device for displaying an image on the basis of an image signal supplied from an image supply device includes a brightness detecting section that detects a gray level which characterizes brightness of a predetermined pattern image from a pattern image signal when the predetermined pattern image is supplied from the image supply device; a storing section that stores a reference gray level predetermined in the pattern image; a correction parameter setting section that sets a correction parameter for compensating by a difference between the gray level detected by the brightness detecting section and the reference gray level stored in the storing section; and a correcting section that corrects the brightness of the image signal supplied from the image supply device on the basis of the correction parameter.Type: ApplicationFiled: March 20, 2006Publication date: December 21, 2006Applicant: SEIKO EPSON CORPORATIONInventors: Shohei Yoshida, Takashi Toyooka, Hidehito Iisaka
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Publication number: 20060221259Abstract: An image display device having an optical modulation element, which modulates light emitted from a light source according to display information, and displaying a display image based on the display information includes: a unit adjusting the amount of illumination light with respect to light emitted from the light source on the basis of brightness information on the brightness of the display image based on the display information; a color conversion processing unit that performs a color conversion process according to the brightness information with respect to the display information so that the display image can be color-reproduced within a predetermined color space; and a display and driving unit that drives the optical modulation element on the basis of the display information having been subjected to the color conversion process so as to display the display image.Type: ApplicationFiled: March 27, 2006Publication date: October 5, 2006Applicant: Seiko Epson CorporationInventors: Yasunaga Miyazawa, Hiroshi Hasegawa, Hidehito Iisaka, Hidehiro Akahane, Takashi Toyooka