Asus VG278H LightBoost strobes: 2 millisecond @ 120Hz

My USBee compatible oscilloscope has arrived!  I did photodiode tests on an impulse-driven LCD computer monitor with a LightBoost strobe backlight at 120Hz refresh. When LightBoost is enabled, the ASUS VG278H computer monitor backlight strobes once every refresh, at 2ms per refresh. The backlight LED’s appear to be fully illuminated for 2.0ms, with a ramp-down of about 0.4ms (caused by LED phosphor decay).

It has been observed, using motion test patterns, that turning on LightBoost on an ASUS VG278H monitor has over 70% less motion blur than normal LCD 120Hz, and over 85% less motion blur than normal LCD 60Hz.

This is mathematically consistent, according to Science & References.  2.4ms strobes is over 70% shorter than the 8.33ms length of a single 120Hz refresh, and over 85% shorter than than the 16.67ms length of a single 60hz refresh. The backlight strobes eliminating the LCD sample-and-hold effect.

The BENQ XL2411T (1ms) computer monitor is reported to use 1ms strobes for LightBoost. This would result in 94% less motion blur than LCD 60Hz. A comparison will be published early next year.

UPDATE: There’s a way to shorten the backlight strobes for even clearer fast motion! Go into your monitor menus, and adjust the LightBoost OSD downwards, towards 10%.  Using a lower setting shortens the strobes to as short as 1.4ms!  Don’t use the LightBoost “OFF” setting however.  The picture becomes dimmer at lower settings, so choose a compromise setting. More information in the LightBoost HOWTO.

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3 Responses to Asus VG278H LightBoost strobes: 2 millisecond @ 120Hz

  1. damiola says:

    great work!
    if it possible make test of XL2420T. Awaiting 144hz with Lightboost )

  2. scanmaster says:

    Adjusting LightBoost via the monitor’s controls to 10% setting (not “OFF”) has a strobe length that is about 1.4ms. This provides 92% motion blur elimination compared to 60 Hz LCD. However, the image is very dim.

    If the image is too bright, adjust brightness downwards via the LightBoost setting — you gain more motion blur reduction with lower LightBoost settings!

  3. slimbone says:

    Hey Dude i Have Same monitor VG278H i need help can some one help me teamviewer … skype : shadifares2001

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