It requires the utility for best performance.thizito wrote:It works without the software or need to have the utility with crosstalk ability?
Behind The Scenes: The purpose of the "Vertical Total" tricks is to enlarge the blanking interval between refresh cycles. The purpose of doing this is more time for LCD GtG pixel transitions to finish between refreshes, so that a strobe backlight can perform better (flash on fully refreshed frames, as LightBoost does, http://www.blurbusters.com/lightboost/video/ ...) Increasing the Vertical Total accelerate the refresh cycles (e.g. scan each refresh faster than 1/120sec) while increasing the pause between refreshes. LightBoost does this internally already (partially buffers input and then does accelerated scanout) so has very low strobe crosstalk. However, BENQ Blur Reduction doesn't do this.
What Is Visible: With the Utility, you are able to adjust the "Crosstalk" setting (strobe timing relative to refresh cycle) - so that the ghosting band moves upwards/downwards. The ghosting band (double image effect) exists because the backlight strobes in the middle of a refresh cycle. Earlier strobe timing results in very slightly less input lag (default ~1ms to ~2ms less), but can cause bad motion artifacts. With a larger Vertical Total, you are able to adjust the crosstalk setting, so that the ghosting band fits more fully offscreen (between refreshes) before bad crosstalk (double image effect) reappears at the top edge.
-- Small Vertical Totals, the ghosting band wraps around more quickly to the top edge.
-- Large Vertical Total, the ghosting band falls off the screen more before parts of it shows up again at the top edge.
Given a sufficiently large Vertical Total, and at a low enough refresh rate, the ghosting band completely fits offscreen between refresh cycles. VT1500 at 75Hz, creates a blanking interval of something north of 4 milliseconds, large enough to fit the majority of a 1ms LCD GtG transition between refreshes.
If you are anxious to try it on V1, you try to do this with V1, you might be able to get the ghosting band to shift slightly downwards, but won't be as good as calibrating with V2 firmware. Try low and high numbers for the Front Porch values (e.g. try a number of 240 for Front Porch). It may shift the ghosting band downwards by approximately 240 pixels. This may not noticeably improve things unless you're paying attention.