| 摘要 |
A focus compensation apparatus and method for a monitor system are provided. The focus compensation apparatus includes a parabolic signal generation circuit for generating a parabolic signal in synchronization with a horizontal flyback pulse, the waveform of the parabolic signal varying in response to first and second control signals. A video signal focus compensator adjusts the gain of an input video signal such that the gain increases from the center of the monitor screen toward the edge of the monitor screen in response to the parabolic signal. The focus compensator outputs a gain-adjusted video signal as a focus-compensated video signal. According to the focus compensation apparatus, the gain of an input video signal is adjusted using a parabolic signal, the level of which increases from the center of a monitor screen toward the edge of the monitor screen, thereby preventing a picture from being out of focus and blurred at the edge of the monitor screen. In addition, the waveform of the parabolic signal is automatically varied by a parabolic signal generation circuit while the gain of the input video signal is being adjusted to adjust contrast or auxiliary contrast, thereby effectively performing focus compensation at the edge of the monitor screen.
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