Patents by Inventor Hitoshi Motonakano

Hitoshi Motonakano 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).

  • Gamma corrector and image display device using the same
    Patent number: 6577285
    Abstract: A gamma corrector inputs a primary color signal as an image signal to each of the differential amplifiers which are connected in parallel to each other and mixes a plurality of output signals which are outputted from the four differential amplifiers to output an image signal to which a plurality of gamma correction is applied. Each of the differential amplifiers amplifies and outputs the inputted primary color signal with a different gain characteristic so that the gain characteristic of the signal obtained by mixing the output signals varies at two inflection points. The two-point gamma correction is applied to the inputted primary color signal so that a signal level at the side of a black level is turned down and the signal level at the side of a white level is turned up.
    Type: Grant
    Filed: October 14, 1999
    Date of Patent: June 10, 2003
    Assignee: Sony Corporation
    Inventors: Hitoshi Motonakano, Shozo Mitarai
  • Illumination intensity correcting circuit
    Patent number: 6535255
    Abstract: An illumination intensity correcting circuit including a curve fitting circuit formed by differential amplifier circuits and a load resistor, wherein the amplification factor of the curve fitting circuit is changed before and after each breakpoint voltage, the reference voltages of the differential amplifier circuits are set so that at least two breakpoint voltages are arranged in the range of a voltage of a video signal, and the amplification factors of the differential amplifier circuits are set so that the amplification factor of the curve fitting circuit in the range of the signal voltage inside of the two breakpoint voltages is smaller than the amplification factor outside of the two breakpoint voltages.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: March 18, 2003
    Assignee: Sony Corporation
    Inventors: Hitoshi Motonakano, Shozo Mitarai, Akira Arimizu
  • Illumination intensity correcting circuit
    Publication number: 20020005911
    Abstract: An illumination intensity correcting circuit including a curve fitting circuit formed by differential amplifier circuits and a load resistor, wherein the amplification factor of the curve fitting circuit is changed before and after each breakpoint voltage, the reference voltages of the differential amplifier circuits are set so that at least two breakpoint voltages are arranged in the range of a voltage of a video signal, and the amplification factors of the differential amplifier circuits are set so that the amplification factor of the curve fitting circuit in the range of the signal voltage inside of the two breakpoint voltages is smaller than the amplification factor outside of the two breakpoint voltages.
    Type: Application
    Filed: September 25, 2001
    Publication date: January 17, 2002
    Inventors: Hitoshi Motonakano, Shozo Mitarai, Akira Arimizu
  • Illumination intensity correcting circuit
    Patent number: 6295098
    Abstract: An illumination intensity correcting circuit including a curve fitting circuit formed by differential amplifier circuits and a load resistor, wherein the amplification factor of the curve fitting circuit is changed before and after each breakpoint voltage, the reference voltages of the differential amplifier circuits are set so that at least two breakpoint voltages are arranged in the range of a voltage of a video signal, and the amplification factors of the differential amplifier circuits are set so that the amplification factor of the curve fitting circuit in the range of the signal voltage inside of the two breakpoint voltages is smaller than the amplification factor outside of the two breakpoint voltages.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: September 25, 2001
    Assignee: Sony Corporation
    Inventors: Hitoshi Motonakano, Shozo Mitarai, Akira Arimizu