Patents Assigned to Panasonic Electronic Works Co., Ltd.
  • Discharge lamp lighting device, illumination device, and liquid crystal display device
    Patent number: 8115421
    Abstract: A burst dimming signal to determine a ratio between an ON period and an OFF period is inputted. In the OFF period of the burst dimming signal, a lamp current Ila is stopped from flowing to a discharge lamp FL, while a lamp voltage Vla is applied to both ends of the discharge lamp FL, and preheating currents If1 and If2 are supplied to hot cathodes of the discharge lamp FL. In the ON period of the burst dimming signal, the discharge lamp FL is electrically broken down and is supplied with the lamp current Ila.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: February 14, 2012
    Assignee: Panasonic Electronic Works Co., Ltd.
    Inventors: Masanori Mishima, Masahiro Naruo