Patents by Inventor Hidehito Iisaka
Hidehito Iisaka 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: 20100321417Abstract: The invention provides a display device, a direct-view display device, and a projection display device in which their apparent dynamic ranges are increased with less color change. The display device can include a light modulation device having a plurality of pixels for displaying an image according to an image signal, a light source for illuminating the light modulation device, and a light-source driving device for controlling the intensity of light emitted from the light source by controlling the period in which the light source is lit at a specified brightness per unit time.Type: ApplicationFiled: August 13, 2010Publication date: December 23, 2010Applicant: SEIKO EPSON CORPORATIONInventors: Hidehito Iisaka, Shohei Yoshida, Takashi Takeda, Hidefumi Sakata
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Patent number: 7800604Abstract: An object of the present invention is to provide a liquid crystal device which can suppress cross-talk and can maintain uniformity of the display quality within the screen, and for which problems such as insufficient writing do not occur. In a liquid crystal light valve of the invention, an image signal for which the polarity is inverted for each one horizontal period, is supplied to each data line, and for each horizontal period plural pulse signals which each rise at a different timing, are supplied to each of plural scanning lines while skipping one part of the scanning lines. Moreover driving is such that in any one horizontal period, plural scanning lines, to which is supplied a pulse signal rising at a timing corresponding to an application period of a positive polarity potential, are adjacent to each other, and plural scanning lines, to which is supplied a pulse signal rising at a timing corresponding to an application period of a negative polarity potential, are adjacent to each other.Type: GrantFiled: November 21, 2006Date of Patent: September 21, 2010Assignee: Seiko Epson CorporationInventor: Hidehito Iisaka
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Patent number: 7796291Abstract: An electro-optical device includes a plurality of pixels arranged in association with intersections of a plurality of scanning lines and a plurality of data lines, each of the plurality of pixels displaying a grayscale level corresponding to a data signal supplied to a corresponding data line when a scanning line is selected; a memory that stores upper n bits of input image data in which the grayscale level of each of the plurality of pixels is designated by m bits and that reads the stored n bits of image data, where “m” and “n ” represent positive integers satisfying a condition m>n; an adding circuit that adds lower (m?n) bits to the n bits of image data read from the memory; a selector that selects the input image data when the m bits of image data are input and that selects image data including the (m?n) bits added thereto by the adding circuit when the n bits of image data are read from the memory; a scanning line driving circuit that selects, from among the plurality of scanning lines, the scanningType: GrantFiled: September 21, 2006Date of Patent: September 14, 2010Assignee: Seiko Epson CorporationInventors: Hiroyuki Hosaka, Hidehito Iisaka, Takashi Nishimori
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Patent number: 7768688Abstract: 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: June 13, 2008Date of Patent: August 3, 2010Assignee: Seiko Epson CorporationInventors: Yasunaga Miyazawa, Hiroshi Hasegawa, Hidehito Iisaka, Hidehiro Akahane, Takashi Toyooka
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Publication number: 20100165218Abstract: Aspects of the invention can provide a display device, a display method, and a projection type display device that allow a characteristic of a display image such as brightness to be continuously changed. The display device can include a light source capable of emitting a plurality of different color lights and a white light, and an optical modulation device for modulating light corresponding to the lights emitted from the light source. The ratio of the period of emitting the white light relative to the total of the periods of emitting the lights from the light source can be variable.Type: ApplicationFiled: March 10, 2010Publication date: July 1, 2010Applicant: SEIKO EPSON CORPORATIONInventor: Hidehito IISAKA
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Patent number: 7746530Abstract: 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: June 13, 2008Date of Patent: June 29, 2010Assignee: Seiko Epson CorporationInventors: Yasunaga Miyazawa, Hiroshi Hasegawa, Hidehito Iisaka, Hidehiro Akahane, Takashi Toyooka
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Publication number: 20100103205Abstract: A driving method includes: dividing a unit period into a plurality of sub-frame periods corresponding to the primary colors; writing a primary color component in each sub-frame period by a first scan executed on the plurality of pixels; irradiating, in each sub-frame period, the plurality of pixels with the corresponding primary color of light by the irradiation unit at a timing that is after the first scan and before the first scan of a subsequent sub-frame period; and waiting a wait period that is from when the first scan of one primary color component among the at least three colors ends until when the irradiation unit starts irradiating the one primary color of light, the wait period for the one primary color being different from wait periods for the other colors.Type: ApplicationFiled: October 27, 2009Publication date: April 29, 2010Applicants: SEIKO EPSON CORPORATION, NEC DISPLAY SOLUTIONS, LTD.Inventors: Hidehito IISAKA, Hiroyuki HOSAKA, Taku KITAGAWA, Shuichi NAKANISHI, Atsushi KATO
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Publication number: 20100060556Abstract: The invention provides a display device and a light adjusting method thereof capable of carrying out light adjustment effectively by the output control of a light source and, preferably, of effecting light adjustment according to color distribution of a displayed image. The display device of the invention that is capable of adjusting a displayed image by changing light flux can include a plurality of light sources having light emitting diodes, an image analyzing unit for outputting a light control signal for controlling the output of each of the light sources, based on an image signal of the displayed image, and a light control device for controlling the output of each of the light sources based on the light control signals.Type: ApplicationFiled: November 16, 2009Publication date: March 11, 2010Applicant: Seiko Epson CorporationInventors: Shohei YOSHIDA, Hidehito IISAKA
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Patent number: 7646462Abstract: A liquid crystal device includes a pair of substrates between which liquid crystal is sandwiched, a plurality of pixel electrodes arranged in a matrix on one of the substrates, switching elements that control the supply of current to the pixel electrodes, scanning lines that supply scanning signals to the switching elements, and data lines that cross the scanning lines and that supply image signals to the switching elements. The pixel electrodes are arranged in pairs, and each pair of the pixel electrodes are adjacent in an extending direction of the data lines and are disposed between a corresponding pair of the scanning lines in the extending direction of the data lines. The switching elements corresponding to each line of the pixel electrodes arrayed in the extending direction of the data lines are alternately connected to either of opposing sides of an adjacent pair of the data lines in the extending direction of the data lines.Type: GrantFiled: September 18, 2006Date of Patent: January 12, 2010Assignee: Seiko Epson CorporationInventor: Hidehito Iisaka
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Patent number: 7639220Abstract: The invention provides a display device and a light adjusting method thereof capable of carrying out light adjustment effectively by the output control of a light source and, preferably, of effecting light adjustment according to color distribution of a displayed image. The display device of the invention that is capable of adjusting a displayed image by changing light flux can include a plurality of light sources having light emitting diodes, an image analyzing unit for outputting a light control signal for controlling the output of each of the light sources, based on an image signal of the displayed image, and a light control device for controlling the output of each of the light sources based on the light control signals.Type: GrantFiled: April 6, 2004Date of Patent: December 29, 2009Assignee: Seiko Epson CorporationInventors: Shohei Yoshida, Hidehito Iisaka
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Publication number: 20090195561Abstract: A driving circuit of an electro-optical device includes a scanning line driving circuit and a data line driving circuit. When a writing scanning line is selected, the data line driving circuit supplies a data signal of an on or off voltage allocated to a sub-field corresponding to the selection in terms of a gray scale of the pixel corresponding to the selected one of the writing scanning lines and one of the data lines. Among the plurality of sub-fields, the length of a time period of the shortest sub-field is set shorter than the length of a time period required to select, by the scanning line driving circuit, the plurality of writing scanning lines.Type: ApplicationFiled: April 28, 2008Publication date: August 6, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Hidehito IISAKA, Hiroyuki HOSAKA
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Publication number: 20090079769Abstract: A display device includes a data converting section that converts display data that is to be supplied to pixel units. The data converting section converting on the basis of a predetermined conversion rule for each of a plurality of fields. The plurality of fields corresponds to respective light emission time periods of the plurality of light beams and following one after another in a successive manner on a time axis. The predetermined conversion rule converts data for a preceding field of one color to achieve a value in a successive field of a different color, such that the value approaches a desired value for at least one of brightness and color obtained when an image is displayed in the display area during the successive field.Type: ApplicationFiled: August 8, 2008Publication date: March 26, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Hidehito IISAKA, Hiroyuki HOSAKA
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Patent number: 7486265Abstract: A method of driving an electro-optical device includes dividing a vertical scanning period into first and second sub-fields of individual colors; stopping irradiation of light in the first sub-field; almost simultaneously selecting one scanning line and one or more adjacent scanning lines in a predetermined order; supplying to pixels data signals designating a gray-scale level of the color corresponding to one field, as data signals corresponding to the pixels located at the one scanning line among the selected scanning lines during each selection of the scanning lines; in the second sub-field, controlling the light so as to irradiate light of a corresponding color; selecting scanning lines other than the one scanning line; and supplying to pixels data signals designating a gray-scale level of the color corresponding to the one field, as data signals corresponding to the pixels of the selected scanning line during each selection of the scanning lines.Type: GrantFiled: October 28, 2005Date of Patent: February 3, 2009Assignee: Seiko Epson CorporationInventors: Hiroyuki Hosaka, Hidehito Iisaka
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Patent number: 7474302Abstract: A driving circuit of an electro-optical device that can reduce or prevent bad influences of a transverse electric field and a crosstalk is provided. There can also be provided a driving circuit of an electro-optical device, the driving circuit generating timing signals for supplying scanning signals to a display unit in which pixels can be formed corresponding to the respective intersections between a plurality of data lines and a plurality of scanning lines arranged in a matrix shape and the switching elements provided in the pixels are turned on by the scanning signals supplied to the scanning lines, so that the image signal supplied to the data lines are applied to the pixel electrodes of the pixels through the switching elements to drive the display unit.Type: GrantFiled: January 27, 2005Date of Patent: January 6, 2009Assignee: Seiko Epson CorporationInventor: Hidehito Iisaka
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Publication number: 20090002313Abstract: A lighting apparatus used for a projection type display is provided, which can change the incident ray volume to an optical modulation device without changing the optical output intensity of the lamp, and can exhibit excellent effects in expressive power of an image and adaptability to the use environment. The lighting apparatus of the present invention comprises; a light source, two fly-eye lenses constituting a uniform lighting device, and a shading plate arranged between these fly-eye lenses and constituting a dimming device for adjusting the amount of light of the outgoing light from the light source. The angle of inclination of the shading plate is controlled based on an image signal supplied to the optical modulation device, thereby enabling adjustment of the amount of light.Type: ApplicationFiled: July 21, 2008Publication date: January 1, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Hidehito Iisaka, Shoichi Uchiyama
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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: 20080278468Abstract: A driving circuit of an electro-optical device wherein one field is divided into p (p is an integer that is equal to or more than two) groups and each group is divided into two sub-fields. The p groups each are set to have the length of a time period that is equal to one another. The 2p sub-fields that constitute the one field are set to different lengths of time periods in such a manner that a boundary between two sub-fields of each group is shifted by a predetermined interval compared to the boundary between the two sub-fields of the preceding group. The different gray scale values are expressed by turning on a single sub-field or n (n is an integral number that is equal to two or more and that is equal to or less than 2p) sub-fields that are adjacent to each other.Type: ApplicationFiled: April 22, 2008Publication date: November 13, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Hiroyuki HOSAKA, Hidehito IISAKA
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Patent number: 7417618Abstract: A lighting apparatus used for a projection type display is provided, which can change the incident ray volume to an optical modulation device without changing the optical output intensity of the lamp, and can exhibit excellent effects in expressive power of an image and adaptability to the use environment. The lighting apparatus of the present invention comprises; a light source, two fly-eye lenses constituting a uniform lighting device, and a shading plate arranged between these fly-eye lenses and constituting a dimming device for adjusting the amount of light of the outgoing light from the light source. The angle of inclination of the shading plate is controlled based on an image signal supplied to the optical modulation device, thereby enabling adjustment of the amount of light.Type: GrantFiled: August 1, 2005Date of Patent: August 26, 2008Assignee: Seiko Epson CorporationInventors: Hidehito Iisaka, Shoichi Uchiyama