High Speed Video of Strobe Backlight


Strobe backlights such as ULMB and LightBoost eliminate motion blur on LCD displays.

Several 120 Hz+ monitors now have a refresh-synchronized strobe backlight feature (e.g. LightBoost, ULMB, etc) that can be enabled, to allow CRT crystal clear motion on LCD. This high-speed video (1000 fps) demonstrate a motion-blur-reducing strobe backlight can successfully hide most LCD pixel response limitations from human eyes:

The backlight is turned off while waiting for pixel transitions (unseen by human eyes), and the backlight is strobed only on fully-refreshed LCD frames (seen by human eyes). The strobes can be shorter than pixel transitions, breaking the pixel transition speed barrier.

It’s possible to have MPRT measurements (milliseconds) faster than the LCD GtG response measurements (milliseconds)! MPRT measurements more accurately represents eye-tracking-based motion blur on sample-and-hold display technologies such as LCD and OLED (which can have motion blur too).

For more information, see Motion Blur Reduction FAQ which explains more about the benefits, and the pros/cons.

Many monitors in the Official List of Gaming Monitors now have motion blur reduction features under different names including LightBoost, NVIDIA ULMB / Ultra Low Motion Blur, ASUS ELMB, BENQ DyAc, EIZO Turbo 240, LG Motion 240. These features can be toggled ON/OFF depending on user preference.

ENGINEERS/ADVANCED READERS: For geeks interested in engineering information, see Electronics Hacking: Creating a Strobe Backlight for the advanced background information of strobe backlights, which also contains a great annotated diagram of proper strobe backlight operation.

Note: This high speed video is of the ASUS VG278H monitor running the TestUFO flicker test in Chrome web browser running in full screen mode.

4 comments on “High Speed Video of Strobe Backlight

  1. Chief Blur Buster says:

    EDIT: Old comment 2013, above post is updated 2017

    Photodiode oscilloscope test:
    LightBoost OSD setting at 100% = 2.4 millisecond strobes
    LightBoost OSD setting at 10% = 1.4 millisecond strobes

    I am testing new motion tests. It’s amazing to see an ASUS VG278H (a 2ms TN LCD) shatter the pixel persistence barrier with an actual measured Motion Picture Response Time (MPRT) of 1.4ms. Truly, modern strobe backlights are amazing! CRT-style motion clarity is now here today on LCD.

    Although TN color is not very good, the motion is more than 10x sharper than a 60 Hz LCD (TN or IPS) due to 1.4ms strobes instead of 16.7ms frames (1/60sec) due to the sample-and-hold effect. Strobe backlights do not suffer from backlight diffusion effects (found in older scanning backlights), and thus have no upper limiting factor in motion blur elimination. Motion blur is shown to be accurately directly proportional to strobe length. Such short strobe lengths yields a high-definition motion experience where fast video game pans look exactly as sharp as stationary images.

    The new 1ms monitors are better due to reduced crosstalk — the BENQ XL2411T (which I also own) and the ASUS VG248QE have the clearest LightBoost motion. Ghosting tests have shown less than 0.5% leakage of frames between refreshes; and there is less 3D crosstalk on these panels than for polarized 3D (which is _very_ surprising). Although I prefer to play 2D without the motion blur; it’s much easier on my eyes.

    If you do not care about color, but want the world’s sharpest fast motion on a non-CRT display, there is no commercially available display other than a LightBoost display today. Actual measured MPRT’s shattering the pixel persistence barrier!

    Hopefully this technology arrives on IPS and PVA panels within a few years!

  2. o2sus says:

    Hey, I used to have Lightboost installed on my pc and worked flawlessly. I just recently did a full reinstall of windows, and using the same monitor now, I installed lightboost and did TESTUFO image check. I was only getting 60fps and 60HZ refresh rate. I checked under monitor properties i had 120hz selected after I used ToastyX easy strobe. I then tried using CRU tutorial. to no avail, im not getting 120hz when i do the test 🙁 I am yes using a DVI cable. and I have an ATI card. I am really confused as to what the problem could be? any helps would be great thanks

    Monitor is asus vg248qe

  3. Osyris13 says:

    Hi everyone. I have a benq xl2420t with 3d. But have a video card gtx 860m dont support 3d (no have option inside nvidia panel) so. Can i use this guide? Please give me support. =) thanks

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