| 摘要 |
A common voltage compensation circuit for a liquid crystal display device is provided to compensate distortion of common voltage by selecting a common voltage compensation circuit unit suitable for frame frequency among a plurality of common voltage compensation circuit units having different compensation rates respectively. A common voltage compensation circuit for a liquid crystal display device includes a control unit(42), and a plurality of common voltage compensation units(44), and a common voltage compensation unit(45). The control unit selects a common voltage compensation unit pre-programmed by compensation rate(R44,R43) according to frame frequency. The common voltage compensation units(44) are selectively driven by the control unit and generate common voltage(Vcom) for compensating distorted components of gate drive voltage or fed-back common voltage. The common voltage compensation unit(45) compensates the distorted components of common voltage or gate drive voltage by using the compensating common voltage generated by the common voltage compensation units(44).
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