Backlight driving signal generator for liquid crystal display control device

Backlight driving signal generator for liquid crystal display control device

  • CN 101,079,237 B
  • Filed: 05/25/2006
  • Issued: 05/30/2012
  • Est. Priority Date: 05/25/2006
  • Status: Active Grant
First Claim
Patent Images

1. backlight driving signal generator that is used for liquid crystal display control device is used to control the backlight source driving circuit of a display, it is characterized in that, comprising:

  • One first pulse width modulation unit is in order to produce one first pulse signal;

    AndOne second pulse width modulation unit is in order to produce one second pulse signal;

    Wherein, when this backlight driving signal generator was used for the driving circuit of a cathode fluorescent tube, this driving circuit was a push-pull driver circuit, and this first pulse signal and this second pulse signal replace the accurate position of output HIGH voltage;

    When this backlight driving signal generator is used for the driving circuit of a back light source in LED;

    This first pulse signal replaces the accurate position of output HIGH voltage;

    When this backlight work the time;

    This second pulse signal continues the accurate position of output HIGH voltage;

    When this backlight is closed, the accurate position of this second pulse signal output LOW voltage, wherein this back light source in LED driving circuit comprises voltage feed unit that the DC-to-dc change-over circuit constitutes and the transistor that carries out conducting or closing motion respectively according to this first pulse signal and this second pulse signal.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×