That's easy -- it's just merely manipulating Brightness / Contrast. Either via monitor OSD (preferred) or via graphics drivers (fallback). You want to brighten blacks and dim the whites. Or use one of the "16-to-235" modes instead of the "0-to-255" modes. (some drivers have that option). You lose a little contrast and color precision.KKNDT wrote:The only thing I haven't tried yet is to reduce the dynamic range. I don't know whether it can be done by users.
But with this "reduce dynamic range" trick, you've intentionally added more overdrive overshoot headroom below black, and above white -- which can reduce ghosting effects for high-contrast color edges.
Large Vertical Totals will help hide the crosstalk zone offscreen on most of the 144Hz BenQ/ZOWIE monitors. The longer VBI gives more time for LCD GtG to complete between refresh cycles.k2viper wrote:Got some XL2546 crosstalk pics from a Russlan forum user, they can be seen here: https://drive.google.com/file/d/1TzZTD5 ... v7mQR/view
I'd say its pretty similar to LG's crosstalk, but XL2546 definitely have much more obvious overshoot which overall makes picture look worse then LG's.
The end result is that you'll have more space to move the "crosstalk bar" (via "Strobe Phase" adjustments) off the screen before it wraps-around to the opposite edge of the screen -- imagine a Large Vertical total as virtual screenspace below bottom edge of screen or above top edge of screen, that provides "crosstalk bar hiding room".
That's a scanout diagram of a Large Vertical Total via Custom Resolution Utilities.
This specific example is 100 refresh cycles per second, even though a display panel is scanned out in 1/144sec.
The bigger VBI -- the easier to hide LCD GtG in the VBI (aka VSYNC interval). The bigger the VT, the better. And it's easier to have larger VT at lower refresh rates. That's why lower-Hz strobing has less strobe crosstalk -- LCD GtG is hidden between refresh cycles = more strobe crosstalk disappears.
....Now you're getting it! That's why Large Vertical Totals really help strobe backlights.
The bigger the Large Vertical Total, the easier it is to push the crosstalk zone off the screen edge before it "wraps around" to the top edge of the next refresh cycle.
The VBI height (the pause between refresh cycles) ideally needs to be taller than the crosstalk zone to more completely hide the worst strobe crosstalk between refresh cycles! That's the "Cramming LCD GtG pixel response into the Vertical Blanking Interval (VBI/VSYNC)" trick that strobe backlights do to bypass LCD pixel response limitations.
The VBI size is (Vertical Total - Vertical Active) -- so VT1350 on 1080p means you've got 1080 visible rows of pixels and 320 VBI rows of pixels as the pause between refresh cycles.
The VBI can even be bigger than the image. e.g. 60Hz with the scanout velocity of 240Hz -- approximately ~VT4400 works on certain 240Hz monitors. You open Custom Resolution Utility, go to highest Hertz, put radio button on "Pixel Clock" (lock the pixel clock) and then increase the Vertical Total to lower the refresh rate to your target refresh rate -- and voila. That's the Appendix A approach of http://www.blurbusters.com/crosstalk for creating brand new Large Vertical Total modes for an existing monitor. A quadruple VT (1/240sec) on 60Hz will create an approximately 12 millisecond VBI pause between the 4.2ms scanouts, big enough to drive the LCD GtG truck through, even for 5ms IPS and VA GtG.
There is no limit how big a VBI can be -- except the monitor's technological limitations on tolerating such a large VBI.
(FreeSync/VRR is simply a variable Vertical Total -- variable pause between refresh cycles).
For LG's case, the large-VT 240Hz mode is simply a 240Hz with the scanout velocity of 280Hz.
Which is why I am impressed at LG -- its unique ability to do Large Vertical Total at 240Hz!! It's only approximately 0.8ms VBI, so won't hide 1ms GtG (realworld >1ms GtG).
The HDMI 2 lag-reducing Quick Frame Transport is essentially a form of Large Vertical Total -- but you can do QFT tricks on any signal like DVI, DP, etc.