Does anyone know what the input lag difference is between the various strobeing methods?
ULMB VS Lightboost VS BenQ ? Are they all similar?
Best Twitch-Type Gaming LCD?
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Re: Best Twitch-Type Gaming LCD?
All similiar, +/- 1msScout255 wrote:Does anyone know what the input lag difference is between the various strobeing methods?
ULMB VS Lightboost VS BenQ ? Are they all similar?
Non-strobed during 120Hz on most ASUS/BENQ TN monitors:
3ms -- top edge of screen
7ms -- middle of screen
11ms -- bottom edge of screen
Strobed during 120Hz on most ASUS/BENQ TN monitors:
11ms -- top edge of screen
11ms -- middle of screen
11ms -- bottom edge of screen
It goes down by about 1ms for ULMB.
EIZO's Turbo240 is 18-19ms, compared to 10-11ms for the TN-based strobe methods.
(NOTE: The delta change between top/bottom edges can lead to amplified VSYNC OFF microstutters ("jitteriness") during strobe mode, so for games like Counterstrike: GO, you will prefer fps_max 118 during LightBoost, rather than fps_max 300. This will keep most of jitteriness in check. Adaptive VSYNC, triple buffered VSYNC ON, as well as regular VSYNC ON helps too, at varying latency disadvantages)
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Re: Best Twitch-Type Gaming LCD?
Is it merely by the nature of strobing that this input lag exists? I.e. it is waiting until the entire LCD is refreshed (top to bottom) and then it strobes to show the entire refreshed frame whereas in non-strobed you see the picture during the refresh which shows you a refreshed centre screen earlier (Because it isn't waiting for the bottom to refresh like the strobed set)? Looking at the numbers you know provided this appears to be the case.
I suppose with alternate methods such as a scanning backlight this inherent lag would be eliminated or at the very least greatly reduced yes?
I suppose with alternate methods such as a scanning backlight this inherent lag would be eliminated or at the very least greatly reduced yes?
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Re: Best Twitch-Type Gaming LCD?
Correct.Scout255 wrote:Is it merely by the nature of strobing that this input lag exists? I.e. it is waiting until the entire LCD is refreshed (top to bottom) and then it strobes to show the entire refreshed frame whereas in non-strobed you see the picture during the refresh which shows you a refreshed centre screen earlier
Correct, but scanning backlights are not as efficient as strobe backlights because scanning backlight segments often leak all over the place, including the opposite edge of the screen, interfering with motion clarity improvements. Full-strobe backlights/edgelights don't have this efficiency-limiting limitation, and given a sufficiently fast LCD, motion clarity improvement of LCD is actually theoretically unbounded (it's only dependant on how brightly & briefly you can flash the backlight).Scout255 wrote:I suppose with alternate methods such as a scanning backlight this inherent lag would be eliminated or at the very least greatly reduced yes?
See the following pages explaining motion blur reduction
-- TFT Central Motion Blur Reduction Backlights
-- Electronics Hacking: Creating a Strobe Backlight (jump to scanning backlight section)
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OLED, however can do rolling scans quite efficiently (diagram from japanese site), and it should theoretically possible to have OLEDs that have the same input lag as a CRT, with the same top-to-bottom scan behaviors.
So it is possible for OLEDs to eliminate any input lag penalty from persistence-improving strobing. Alternatively, if LCD stays popular, we could eventually go to 240Hz LCDs and refresh them faster (e.g. blue phase LCDs can be refreshed in mere microseconds, as an example). Strobing during ~240Hz would add only an average of 2ms added input lag, and strobing at 480Hz or 500Hz would add only an average of 1ms added input lag. But by then, we might find a way to do cheap scanning backlights or switch to OLEDs with rolling-scan algorithms.
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Forum Rules wrote: 1. Rule #1: Be Nice. This is published forum rule #1. Even To Newbies & People You Disagree With!
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