Originally Posted by VarmintCong
My Panasonic 37D2 LCD supposedly has backlight scanning, inserting black frames. Yet it has just as much motion blur as my other LCD (5 year old Samsung A650).
Are there LCDs where this backlight scanning actually works, giving you CRT like motion without interpolation?
Home theater displays or computer displays? Regardless, I will answer the question from the perspective of computer monitors.
It has been common that backlight scanning only gave small, incremental improvement in motion blur -- e.g. 20% improvement, 30% improvement. Often, these are not noticeable. It is only recently that strobe backlights have been developed that actually provide dramatic elimination of motion blur (90% improvement). This is because of a new turn of development...
Your A650 is not a shutter-glasses 3D monitor, correct? Having "3D" makes a huge improvement to scanning backlight abilities even for 2D. The reason is shutter-glasses 3D more strictly requires panels to refresh faster. This is because pixels must finish transiting before the next refresh, or 3D shutter glasses would not have been possible. The improved pixel transitions made possible by 3D panels, hugely benefits scanning backlights when doing non-3D operation. Backlights can be flashed on virtually completely-finished pixels rather than partially-finished pixels. So if you truly want the zero motion blur effect on an LCD, you really need a good shutter-glasses-compatible LCD panel with pixel transitions that don't leak fully into the next refresh (crosstalk between refreshes).
Even if you're not interested in 3D; because such panels work _much_ better with scanning backlights.
Newer panels do make a huge difference; you Today, some 120Hz computer monitors made in the last 12 months, show a dramatic improvement in motion blur when playing PC games with the strobe backlight enabled. These 23" and 27" models use a full-panel strobe backlight at 100Hz-120Hz, which actually was measured to reduce motion blur by nearly order of magnitude (relative to a standard 60 Hz LCD), and beyond an order of magnitude in certain cases. The models that most successfully bypass the sample-and-hold effect, with a true measured Motion Picture Response Time (M.P.R.T.) of around 2.0 millisecond (and less) are the following models.
Via following "LightBoost HOWTO
" (to enable the strobe backlight mode in 2D) (requires nVidia graphics card)
- BENQ XL2411T (best; near zero crosstalk, lowest input lag)
- ASUS VG248QE (best; near zero crosstalk)
- BENQ XL2420T
- ASUS VG278H
- ASUS VG278HE (more crosstalk than VG278H)
- Acer HN274H
Via enabling "3D mode" via OSD, which eliminates motion blur in 2D too (because of strobe backlight):
- Samsung S23A950D (slight crosstalk, slight added input lag)
- Samsung S27A950D (slight crosstalk, slight added input lag)
None use interpolation, and as a result, 100% PC video game friendly. You do need a powerful Geforce GTX 680 or faster to get 100fps@100Hz or 120fps@120Hz, as strobe backlight operation is not supported below 100 Hz on these monitors.
Recently, the BENQ XL2411T and ASUS VG248QE was measured to have a 1.4 millisecond MPRT, true impulse-driven, putting it in CRT league for a common medium-persistence phosphor CRT computer monitor. Since the backlight flashes for about that long when the LightBoost setting via OSD is at the 10%-20% setting. The picture is a bit too dim though, so at a more realistic brightness, the MPRT is about 2 milliseconds. Most 60 Hz LCD's are measured to have an MPRT's about 10 times higher than that (even when LCD pixel response is 2ms or 5ms) due to the sample-and-hold effect 1/60sec = 16.7 milliseconds.
There is a motion test called "PixPerAn
" from prad.de that allows people to verify motion blur and trailing/ghosting artifacts. With a LightBoost monitor, when enabling LightBoost, all trailing artifacts are virtually gone on the BENQ XL2411T and ASUS VG248QE, to nearly unnoticeable levels. It also means nearly no crosstalk during 3D operation. It requires a magnifying glass to see them:
This is a moving image (BENQ XL2411T and ASUS VG248QE) with the LightBoost strobe backlight enabled.
If you sit at a normal arm's length viewing distance, no visible ghosting, no trailing, no coronas, no RTC overshoots.
(Credit: OCBurner from HardForum.com)
Magnification, you can only barely see it:
(Credit: imgur from overclockers.co.uk)
So, as you can very clearly see, pixel persistence ceased to be the motion blur barrier.
It is pretty apparent in these images, even though these are stationary-camera rather than pursuit-camera images.
Even at speeds of 960 pixels per second, you can see the individual pixels -- the pixels are no longer motion-blurred (at LightBoost setting of 20%). You can even perfectly read the tiny "I NEED MORE SOCKS" text even when the car is zooming from left edge to right edge of the screen (1920 pixel wide) in just 2 seconds. No LCD's have been able accomplish such motion blur elimination until recently.
(Caveat: The image does become darker with the strobe backlight operation, and colors quality is not as good)
Blogger References:TechNGaming.com: Eliminate Motion Blur While Gaming With NVIDIA LightBoost3D Vision Blog: Take advantage of Lightboost for 2D gamingpcgameshardware.de: Lightboost strobe hackThe Blur Busters Blog
Forum References:Thread on HardForum
(hugely popular thread)Thread on Overclock.net
(hugely popular thread)Thraed on overclockers.co.uk
Alas, these are not home theater displays.
But it does answer the question, "Are there LCD's that have CRT-sharp motion clarity without interpolation?" -- which is finally a YES if you're using a computer and want to play video games (Games like Half Life series, Crysis, Counter Strike, Bioshock 2, Team Fortress 2, Battlefield 3, etc). I'm specifically talking about motion blur, of course -- not color.Edited by Mark Rejhon - 2/22/13 at 3:35pm