Automatic Beam Current Control Patents (Class 348/327)
  • Publication number: 20120050598
    Abstract: A photoelectric conversion apparatus includes a plurality of unit pixels each including a first photoelectric conversion unit and a second photoelectric conversion unit, and a pixel output unit shared by the first photoelectric conversion unit and the second photoelectric conversion unit. The first photoelectric conversion unit is configured to be depleted when it is reset, while the second photoelectric conversion unit is configured not to be depleted when it is reset.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Tomohisa Kinugasa, Daisuke Inoue, Yukihiro Kuroda, Kouji Maeda, Kazuhiro Saito
  • Patent number: 8072542
    Abstract: A correction sampling signal generation circuit is disposed subsequent to a plural-stage sampling signal generation circuit for sequentially generating sampling signals in response to an input timing signal, an extended sampling circuit is disposed subsequent to a plural-stage sampling circuit for sampling a video signal at timing of the sampling signal, and a data signal is sampled at timing of the sampling signal generated by the extended sampling circuit. In a timing adjustment period, the data signal for adjustment is generated, the phases of the data signal and the timing signal are relatively shifted, the outputs of the sampling circuits are supplied to a common output line through respective switches, and the phase of the optimum timing signal or the video signal is determined based on the output from the common output line.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: December 6, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masami Iseki, Somei Kawasaki, Fujio Kawano
  • Patent number: 7286175
    Abstract: Bias control circuitry and method for use in controlling one or more cathode ray tube (CRT) beam currents.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: October 23, 2007
    Assignee: National Semiconductor Corporation
    Inventor: Charles Guan
  • Patent number: 6771023
    Abstract: A system for regulating beam current in a cathode ray tube. The system includes test signal timing and pulse generation logic for outputting test signals operable to stimulate a cathode ray tube at two voltage levels. The system further includes a circuit that inputs the test signal timing and determines correction signals based on signals derived from the cathode in response to stimulating the cathode ray tube at the two voltage levels. The correction signals may include a gain correction signal, a bias correction signal or both. The gain correction signal modifies a signal output to a gain driver that may be AC coupled to the cathode. The bias correction signal output to a clamping circuit coupled to the cathode.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: August 3, 2004
    Assignee: National Semiconductor Corporation
    Inventors: Charles Guan, Andrew Morrish
  • Patent number: 5892544
    Abstract: The present invention relates to a beam current control system for detecting and controlling a beam current generated by a cathode ray tube. The system comprises a video processing circuit that receives a first signal, and which generates a second signal that includes a video signal and a synchronization signal, which is provided to the cathode ray tube. The cathode ray tube generates a beam current corresponding to the second signal, where the beam current has a video signal portion and a synchronization signal portion. A storage element coupled between the video processing circuit and the cathode ray tube clamps the second signal at a first predetermined level, and stores an electrical charge corresponding to the video signal portion of the beam current during a first time interval.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: April 6, 1999
    Assignees: Sony Electronics, Inc., Sony Corporation
    Inventors: Hiroyuki Ikegami, Taro Tadano
  • Patent number: 5550443
    Abstract: An automatic beam current control circuit for a multimode monitor provides a high voltage circuit for regulating its output voltage according to a video signal being applied to a cathode ray tube, a luminance data compensator having an analog-to-digital (A/D) conversion port for receiving the output voltage of a feedback signal from the high voltage circuit and using a microprocessor to compare data converted by the analog-to-digital (A/D) conversion port with reference luminance data stored in a memory to thereby output an automatic beam current control value, and an automatic beam current controller for receiving the automatic beam current control value and automatically adjusting beam current provided to the cathode ray tube.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: August 27, 1996
    Assignee: SamSung Electronics Co., Ltd.
    Inventor: Ji-Young Lee
  • Patent number: 5394188
    Abstract: An anode voltage (high voltage) of a CRT is detected by a voltage division. When it is detected by a comparator that the reduction of the high voltage has exceeded the controlled range of a high voltage stabilizing loop, two switches will be on. When one switch is on, the controlling end of a processing circuit controlling the luminance will be low in the potential and the direct current level or amplitude of a video signal will be limited. Thereby, the luminance will be controlled and the high voltage will become high. Meanwhile, when the other switch is on, the ABL operating voltage will forcibly become low and, even after the two switches become off, the average level of the luminance will be controlled. Thereby, the high voltage will return within a short time into the controlled range of the high voltage stabilizing loop and will be stabilized.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: February 28, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshifumi Ohira
  • Patent number: 5367231
    Abstract: The life time of a CRT is extended by decreasing the temperature of the cathode by 7-30% from the normal operating temperature and by applying a constant voltage signal to a cathode of the CRT which is shifted from a first voltage level for displaying the lowest luminance of the image toward a second voltage level for displaying the highest luminance of the image. The shift is of the order of 5-25%, so that a constant anode current in the range of 2-14 uA flows in the CRT.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: November 22, 1994
    Assignee: International Business Machines Corporation
    Inventors: Masaki Kobayashi, Rieko Kataoka