Patents by Inventor Hiroaki Jo

Hiroaki Jo 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).

  • Publication number: 20040233140
    Abstract: To provide an electronic circuit, an element substrate, an electronic device, an electro-optical device, and an electronic apparatus, which make it possible to perform a precise controlling operation even if manufacturing variations occur, a circuit formation area is an annular formation area of a pixel of a display panel, and does not include a substantially central portion of the pixel. A light emission area is provided in the substantially central portion. One drive circuit is formed in the circuit formation area, and four organic elements OLED are formed in the light emission area. The drive circuit and the organic elements OLED are connected parallel to each other with wirings.
    Type: Application
    Filed: February 9, 2004
    Publication date: November 25, 2004
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiroaki Jo
  • Publication number: 20040208047
    Abstract: The invention provides an electronic circuit, an electronic device, an electro-optical apparatus, and an electronic unit in which characteristic variations of transistors can be suppressed. More particularly, the invention provides an electronic circuit having a digital-to-analog conversion circuit forming a single line driver includes first and second conversion transistors a current transistor first through sixth current-supply transistors first through sixth switching transistors and a reference-current generating transistor. The first conversion transistor and each of the first through sixth current-supply transistors form a current mirror circuit. The reference-current generating transistor, which forms a current mirror circuit with the first conversion transistor is provided. An output terminal of the reference-current generating transistor is connected to an input terminal of the digital-to-analog conversion circuit of the adjacent single line driver.
    Type: Application
    Filed: February 20, 2004
    Publication date: October 21, 2004
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiroaki Jo
  • Patent number: 6806497
    Abstract: The invention provides an electronic circuit, electronic device, method of driving the electronic circuit, electro-optical device, and electronic equipment to detect operational characteristics of the electronic circuit at a high precision. A pixel circuit includes a switching transistor connected between a driving transistor and organic EL element, and detecting transistor for supplying a current detecting circuit with a driving current output by the driving transistor. A holding capacitor is supplied with test data voltage Vdata by turning on a switching transistor with the switching transistor turned off. The current detecting circuit is supplied with a driving current from the driving transistor through the detecting transistor by turning on the detecting transistor with the switching transistor turned off. The current detecting circuit thus detects the driving current in response to the test voltage Vdata.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: October 19, 2004
    Assignee: Seiko Epson Corporation
    Inventor: Hiroaki Jo
  • Publication number: 20040179005
    Abstract: To enhance the display characteristics of moving images and enhance the display quality in an electro-optical device using electro-optical elements that emit light with the brightness in accordance with a driving current, a pixel includes a driving transistor T4 for setting a driving current Ioled in accordance with data stored in a capacitor and an organic EL element OLED that emits light with the brightness in accordance with the driving current Ioled. During a period of time from the moment in which the scanning line corresponding to the pixel in which data is to be written to the moment in which the same scanning line is selected again, at least one of the electric potential of a first power supply line and the electric potential of a second power supply line is set to be variable and a forward bias and a reverse bias are alternately and repeatedly applied to the organic EL element OLED.
    Type: Application
    Filed: February 9, 2004
    Publication date: September 16, 2004
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiroaki Jo
  • Publication number: 20040108518
    Abstract: [Object] To provide an electronic circuit, electronic device, method of driving the electronic circuit, electrooptical device, and electronic equipment for detecting operational characteristics of the electronic circuit at a high precision.
    Type: Application
    Filed: March 17, 2003
    Publication date: June 10, 2004
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiroaki Jo