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  • DT07 : overdrive v2: - afterglow, - outlines
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     DT07 : overdrive v2: - afterglow, - outlines
      Posted on 20/06/2007 at 15:38 by Vincent
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    We already said it and readers regularly complain about it in the forum: the activation of overdrive in LCD monitors reduces afterglow but sometime introduces a white outline around objects in motion. Some are so annoyed about it that they prefer shutting the overdrive down when possible. It is indeed sometime preferable to have a bit more afterglow rather than strong outlines.

    CMO acknowledges this fact and has developed a slightly more complex but really interesting overdrive. Rather than a blunt over amplification, they cut it into three successive steps in the same period of time: two overvoltages and a third stage where the transistor comes back to a low level voltage. The objective is to avoid the overdrive to go too far. It is also a bit inspired by the introduction of the grey stripes of the Black Data Insertion. Going back quickly to a low level introduces briefly darker shades than the one requested in N+1. Second advantage according to CMO: the afterglow perceived diminishes. This has an impact on the retinal persistence but not on the response time. Also, the very high frequency of this twinkling (2 images, or 120 HZ) isn't perceivable. According to CMO, there is no sensation of flickering.

    This Overdrive (CMO speaks of a multi overdrive) will be introduced soon in 24" monitors at an unknown date.

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