High Speed Video of Strobe Backlight

First published June 27th, 2013

Strobe backlights eliminate motion blur on LCD displays. Several 120 Hz monitors now have a refresh-synchronized strobe backlight feature that can be enabled, to allow CRT crystal clear motion on LCD. This high-speed video (1000 fps) demonstrate a LightBoost strobe backlight successfully bypassing LCD pixel transitions:

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! In addition, it eliminates the sample-and-hold effect.

These new LCD displays with zero perceptible motion blur, have less motion blur than plasma displays, and match CRT motion clarity! See List of 120Hz Monitors.

Note: The ASUS VG278H monitor in the video is displaying TestUFO flicker test in Chrome web browser running in full screen mode. The Casio EX-FC200S high speed video feature was used.

4 Responses to High Speed Video of Strobe Backlight

  1. 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!

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