发明授权
US07675489B2 Energy efficient column driver for electroluminescent displays 失效
用于电致发光显示器的节能列驱动器

  • 专利标题: Energy efficient column driver for electroluminescent displays
  • 专利标题(中): 用于电致发光显示器的节能列驱动器
  • 申请号: US11338013
    申请日: 2006-01-24
  • 公开(公告)号: US07675489B2
    公开(公告)日: 2010-03-09
  • 发明人: Chun-Fai Cheng
  • 申请人: Chun-Fai Cheng
  • 申请人地址: CA Fort Saskatchewan, Alberta
  • 专利权人: Ifire IP Corporation
  • 当前专利权人: Ifire IP Corporation
  • 当前专利权人地址: CA Fort Saskatchewan, Alberta
  • 代理机构: Fay Sharpe LLP
  • 主分类号: G09G3/30
  • IPC分类号: G09G3/30
Energy efficient column driver for electroluminescent displays
摘要:
A driving circuit for driving a display panel having pixels arranged in rows and columns, wherein the driving circuit incorporates a resonant circuit that is able to efficiently recover capacitive energy stored on the row of pixels and transfer it to another row of pixels as the rows are addressed by the sequential application of a voltage on each row. The resonant circuit comprises a step down transformer, a capacitor across the primary winding, either the rows or columns of the display panel connected across the secondary winding and an input voltage and FET switches to drive the resonant circuit synchronous with the timing pulses governing the addressing of the display. The value of the capacitor connected across the transformer primary winding is chosen commensurate with the turns ratio on the transformer and the anticipated range of panel capacitance values to effectively limit variations in the resonance frequency with respect to the frequency of the timing pulses. The present invention is an improvement to the resonant driving circuit that employs column drivers that maximize energy recovery in the resonant circuit by employing a means to restrict current flowing through the FETs used to control the column voltage so that substantially all of the current that flows when charge is being removed from the display pixels during the time period between selection of active rows is constrained to flow back through the transformer to charge the primary capacitor.
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