ResponsivenessBenQ’s version of
Overdrive, which is used to balance the remaining lag on the already fast panel and this give rise to improved playback, is known as AMA.
The effect can be seen really clearly when a moving coloured objectis displayed with sufficiently large mono-coloured surfaces. In thistest image, the pentagon moves from left to right. Behind the blackoutlines, a slight shadow can be seen, which is created by thesluggishness of the individual pixels which were black a short time agoand have not yet achieved the final new colour value.
The shadow on the left beside the black outlines shows the sluggish pixels. The pentagon moves to the right.
If AMA, or Overdrive, is activated, an attempt is made to achievethe final colour hue through an intentional short-term over-steering ofthe panel.
However, here, the BenQ Overdrive solution overshoots the mark.Thus, not only are the pixels on the left hand side are too bright, butthose on the right hand side are darkened. Although the contrast on theline is increased somewhat through the Overdrive, the bright seam onthe left hand side is more distracting than the shadow that was visiblebefore. In addition, the shadow on the right hand side is a weakversion of the effect that you actually want to avoid using Overdrive.This bright seam of colour is also known as the corona effect, a typeof bright afterglow at dark edges.
Fundamentally, the TN panel is fast enough and only a small numberof users really need the performance boost. In our opinion, activatingAMA does not provide any visible improvement of the image quality.
With Overdrive, the shadow becomes a bright seam.
Input-Lag
Our measurement of the period of time until the screen content isactually displayed does not provide a constant value, but instead,differences of between 0 ms to 33 ms. Measured from 30 individualvalues, the average input lag is 15 ms.
On the left a 21" CRT, on the right the BenQ V2400W. From top to bottom, some of the measurements we took: 0 ms, 16 ms, 33 ms.
Occasional gamers will not notice this much, but in somecircumstances, the input lag is too much for professional gamers andmay prevent them from being the first to draw in fast-paced shootinggames.
