Eizo 240Hz VA monitor uses strobe backlight. No interpolation.

Upon studying the Eizo FDF-2405W manual for Eizo’s upcoming monitor, there is good news on page 15:

Reducing motion blur “Blur Reduction”
Motion blur occurs when the eye recognizes liquid crystal transitions which comes from changing screens (frames). When “Blur Reduction” is set to “On”, the backlight flickers in sync with liquid crystal transition*1 so the change cannot be seen, thereby achieving clear images with less blur. (Default setting: On)

*1 This monitor converts 120 Hz input signals into 240 Hz within the panel, and doubles the refresh rate to draw two images per frame. By applying a voltage higher than the input signal to speed up response (overdrive) for the first image, and then drawing the second image with the original input signal, the liquid crystals are stabilized. The “Blur Reduction” function turns on the backlight only for the stable duration of the second image, and off for other durations.

This means no interpolation is used, so no input lag from interpolation! The Eizo “240Hz” monitor achieves 240Hz via a two-pass refresh. One overdriven refresh in the dark, unseen by the human eye, followed by a single backlight strobe flash on a very clean 120Hz refresh.  This should produce excellent LightBoost-style quality, reasonable input lag, and excellent VA colors. Although this model is targeted at GIS/mapping, this could potentially become an excellent casual-gaming 120Hz monitor with great color! An interesting question is the strobe flash length, as shorter strobe flahes results in less motion blur.

UPDATE: Eizo has released the gaming version of this monitor, the Foris FG2421.
It uses exactly the same two-pass refresh followed by strobe, at 120 strobes per second.

About Mark Rejhon

Also known as Chief Blur Buster. Founder of Blur Busters. Inventor of TestUFO. Read more about him on the About Mark page.

3 Comments For “Eizo 240Hz VA monitor uses strobe backlight. No interpolation.”

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Sounds impressive. Though I’d like to know if there is a perceptible difference between a regular 120hz IPS and this one to justify the (5-fold? Who knows!) increase in price.


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