Patents by Inventor Kouichi Onomura
Kouichi Onomura 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: 20090207106Abstract: On a panel, a plurality of PVDD lines, each of which corresponds to a horizontal line of pixels and supplies power to the pixels of the horizontal line, are provided. A voltage drop correction unit that obtains a voltage drop before reaching the pixel, based on resistance in the plurality of power supply lines and currents flowing therein, and corrects display data so as to cancel the obtained voltage drop of the pixel. A display unevenness correction unit that corrects uneven brightness caused by a variation in a TFT characteristic of the pixel by performing a calculation using display data of the pixel and obtained correction data of the pixel.Type: ApplicationFiled: February 11, 2009Publication date: August 20, 2009Inventors: Seiichi Mizukoshi, Nobuyuki Mori, Makoto Kohno, Kouichi Onomura
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Publication number: 20090160742Abstract: During image display, pixel current measurement for brightness irregularity correction is carried out. Display is carried out by sequentially writing pixel data in a horizontal direction to pixel sections that are arranged in a matrix shape. Horizontal power supply lines PVDD are arranged for each horizontal line, and power is supplied from these power supply lines to corresponding pixel sections. When carrying out measurement of pixel current by lighting pixel sections one at a time, a horizontal power supply line PVDD of a horizontal line to which the lit pixel belongs is connected to a power supply PVDDb by a switch, and other horizontal power supply lines PVDD are connected to PVDDa.Type: ApplicationFiled: December 9, 2008Publication date: June 25, 2009Inventors: Seiichi Mizukoshi, Makoto Kohno, Kouichi Onomura, Kazuyoshi Kawabe
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Publication number: 20080088567Abstract: A method of measuring a panel current in an active matrix organic electroluminescence display panel, wherein when a current flowing through a display panel when one or a plurality of pixels are caused to emit light is measured, a flow-in current flowing into the display panel from a side of a high voltage and a flow-out current flowing out from the display panel toward a side of a low voltage are simultaneously measured, and a value of a panel current is determined using both obtained measurement results.Type: ApplicationFiled: October 2, 2007Publication date: April 17, 2008Inventors: Seiichi Mizukoshi, Makoto Kohno, Kouichi Onomura
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Patent number: 7345660Abstract: An organic electroluminescent display device in which display pixels containing organic electroluminescent elements are arranged in a matrix, comprising: a correction value formula storage section for storing a correction value formula or coefficients thereof that prescribes a relationship of pixel positions for display and brightness correction data of those pixels; a correction value output section for receiving the input of data for the positions of respective pixels, and outputs correction values for the respective pixels using the correction value formula or coefficients thereof stored in said correction value formula storage section; and the correction value output section corrects brightness data for each pixel using the correction value from said correction value output section according to the pixel position, to thereby perform display to the respective display pixels.Type: GrantFiled: December 30, 2003Date of Patent: March 18, 2008Assignee: Eastman Kodak CompanyInventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura, Makoto Kohno
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Publication number: 20080024136Abstract: Pixel current flowing in each pixel of a display panel is efficiently measured. The display panel 20 includes pixels arranged in a matrix, and performs display by writing pixel data in these pixels. By turning on one pixel alone within a screen for a period of a limited number of lines within one frame, a plurality of pixels are sequentially turned on within one frame. By measuring the current used for performing display within the period during which one pixel alone is turned on, pixel current that flows in that pixel is measured.Type: ApplicationFiled: July 10, 2007Publication date: January 31, 2008Inventors: Seiichi Mizukoshi, Makoto Kohno, Kouichi Onomura
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Publication number: 20070273701Abstract: After a look-up table applies y correction to each of R, G, and B signals, a multiplier multiplies a y corrected signal by a gain. An adder adds an offset to an output of the multiplier and supplies a resultant gain/offset corrected signal to a display panel. Memories store entropy coded correction data, which can be expanded by corresponding expansion circuits and supplied to the multiplier and the adder, respectively.Type: ApplicationFiled: March 13, 2007Publication date: November 29, 2007Inventors: Seiichi Mizukoshi, Makoto Kohno, Kouichi Onomura
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Publication number: 20070268218Abstract: An organic EL display device, including a display panel having pixels arranged in a matrix state, each pixel including an organic EL element and being provided with a driving thin film transistor that corresponds to each organic EL element, and which controls light emission therefrom; a driving power supply that supplies the display panel with a power supply voltage for driving each organic EL element; and voltage changing section for changing the power supply voltage supplied from the driving power supply to the display panel based on one or both of average characteristics of the driving thin film transistor and average characteristics of the organic EL element in the display panel.Type: ApplicationFiled: May 4, 2007Publication date: November 22, 2007Inventors: Seiichi Mizukoshi, Makoto Kohno, Kouichi Onomura
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Publication number: 20070210996Abstract: An organic EL display apparatus including in each display pixel an organic EL element. A drive transistor supplies a drive current that depends on brightness data and having the display pixels arranged in a matrix form. The display includes a correction gain storage unit for storing display pixel positions and a correction gain for correcting the slope of the brightness-data-based drive current of the drive transistors in the display pixels; and a correction unit for correcting pixel-by-pixel brightness data depending on the pixel position using the correction gain stored in the correction gain storage unit into brightness data for the pixel to generate corrected brightness data, each of the display pixels is displayed by driving its drive transistor in response to the data generated by the correction gain storage unit and the correction unit and supplying the corresponding organic EL element with the drive current.Type: ApplicationFiled: March 17, 2005Publication date: September 13, 2007Inventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura, Makoto Kohno
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Patent number: 7164400Abstract: To appropriately adjust luminance and a black level even when characteristics of an organic EL display element should be changed due to an environmental change or heat self-generation, to display a stable image. A current detector detects a level of a total panel current flowing in an organic EL panel. The detected level is subjected to A/D conversion before being supplied to an adder. Meanwhile, a video signal is supplied to a current calculator 24 to be converted into data corresponding to the level of a total panel current, before being supplied to the adder. The adder then compares an average total panel current level, estimated based on a video signal, and an actual total panel current level, to obtain a difference so that a black level for image data to be supplied to the panel is adjusted according to the difference.Type: GrantFiled: January 28, 2004Date of Patent: January 16, 2007Assignee: Eastman Kodak CompanyInventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura, Makoto Kohno
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Publication number: 20070008251Abstract: Nonuniformity in an organic EL display device is effectively detected. All display pixels of an organic EL panel are turned on and the display is photographed with a digital camera. A computer performs image processing of the photographed image to detect an area in which unevenness exists. Then, a V-I curve of each pixel in the area is measured to calculate necessary correction values. The calculated correction values are stored in a memory for use in correcting a signal input to the organic EL panel.Type: ApplicationFiled: June 15, 2006Publication date: January 11, 2007Inventors: Makoto Kohno, Kouichi Onomura, Seiichi Mizukoshi
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Patent number: 6919691Abstract: An organic EL display device which displays by individually controlling an amount of current of organic EL elements, which are arranged in a matrix, according to an input image signal, comprising: a lookup table for storing gamma compensation data for compensating an image signal; storage means for storing an equation for performing gamma compensation of the input image signal; and table data generation means for generating table lookup data and storing such data in the lookup table on the basis of the equation stored in the storage means, and wherein the table data generated by the table data generation means is stored in the lookup table by an initialization operation to perform gamma compensation of the input image signal.Type: GrantFiled: July 29, 2003Date of Patent: July 19, 2005Assignee: Eastman Kodak CompanyInventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura
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Patent number: 6870322Abstract: An organic EL display device which individually controls the amount of current of organic EL elements, which are arranged in a matrix of pixels, according to an input image signal, comprising total current detection circuitry for detecting the total current flowing to all the organic EL elements arranged in the pixel matrix, offset voltage setting circuitry for determining an offset voltage to offset the input image signal so as to apply a voltage which causes the current to start flowing to the organic EL elements according to a black level of the input image signal, and offset voltage control circuitry for controlling the offset voltage, which is responsive to the offset voltage setting circuitry, according to the total current detected by the total current detection circuitry.Type: GrantFiled: July 29, 2003Date of Patent: March 22, 2005Assignee: Eastman Kodak CompanyInventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura
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Publication number: 20050052350Abstract: To appropriately adjust luminance and a black level even when characteristics of an organic EL display element should be changed due to an environmental change or heat self-generation, to display a stable image. A current detector detects a level of a total panel current flowing in an organic EL panel. The detected level is subjected to A/D conversion before being supplied to an adder. Meanwhile, a video signal is supplied to a current calculator 24 to be converted into data corresponding to the level of a total panel current, before being supplied to the adder. The adder then compares an average total panel current level, estimated based on a video signal, and an actual total panel current level, to obtain a difference so that a black level for image data to be supplied to the panel is adjusted according to the difference.Type: ApplicationFiled: January 28, 2004Publication date: March 10, 2005Inventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura, Makoto Kohno
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Publication number: 20050023986Abstract: An organic EL display device which displays by individually controlling an amount of current of organic EL elements, which are arranged in a matrix, according to an input image signal, comprising: a lookup table for storing gamma compensation data for compensating an image signal; storage means for storing an equation for performing gamma compensation of the input image signal; and table data generation means for generating table lookup data and storing such data in the lookup table on the basis of the equation stored in the storage means, and wherein the table data generated by the table data generation means is stored in the lookup table by an initialization operation to perform gamma compensation of the input image signal.Type: ApplicationFiled: July 29, 2003Publication date: February 3, 2005Inventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura
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Publication number: 20040201582Abstract: A display device, for carrying out image display on a display panel by controlling current flowing in display elements for each pixel based on image data, including display setting circuitry for setting a relationship between image data and current values for current flowing in display elements in response to an input adjustment signal, to set contrast or brightness; estimation circuitry for estimating panel current flowing in all pixels when carrying out display for the display panel based on the image data; and current control circuitry for controlling actual panel current by correcting the set contrast or brightness based on the panel current estimated by the estimation circuitry.Type: ApplicationFiled: March 29, 2004Publication date: October 14, 2004Applicant: Eastman Kodak CompanyInventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura, Makoto Kohno
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Publication number: 20040150592Abstract: An organic electroluminescent display device in which display pixels containing organic electroluminescent elements are arranged in a matrix, comprising:Type: ApplicationFiled: December 30, 2003Publication date: August 5, 2004Applicant: Eastman Kodak CompanyInventors: Seiichi Mizukoshi, Nobuyuki Mori, Kouichi Onomura, Makoto Kohno