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Old 28 July 2013, 00:43   #1
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Join Date: Mar 2013
Location: Toronto, Canada
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120Hz Monitor HOWTO: Reduce motion blur in WinUAE!

HOWTO: Reduce Motion Blur in WinUAE on 120Hz LCD Monitors

There are two methods of reducing motion blur with WinUAE on a 120Hz monitor. You can do either (1) or (2) or preferably both (for maximum improvement in motion clarity). This also applies to 100Hz and PAL, because nearly all 120Hz monitors can also do 100Hz.

Also, another bonus of running at 120Hz is less input lag in WinUAE, which is another secondary benefit of running at 120Hz. Even though you may run at only 60fps, the frame is displayed quicker (displayed in 1/120sec, rather than displayed in 1/60sec).


1. Enable LightBoost in your monitor.

Strobe backlights such as LightBoost eliminate motion blur on LCD displays. Several 120Hz monitors now have a refresh-synchronized strobe backlight feature that can be enabled, to allow CRT crystal clear motion on LCD. Blog covers this stuff, plus also TFTCentral: Motion Blur Reduction Backlights Including LightBoost

Instructions: LightBoost HOWTO

Popular Blur Busters pages: 60Hz vs 120Hz vs LightBoost | media coverage | rave reviews | high speed video | LightBoost FAQ

One problem is that LightBoost motion blur elimination is limited to 100Hz to 120Hz, which makes it a problem for emulators. Fortunately, the WinUAE developers have added software-based black frame insertion to simulate 60Hz flicker on a 120Hz monitor, which actually also works great in conjunction with LightBoost.


2. Enable WinUAE black frame insertion.

Software-based black frame insertion has officially been a part of WinUAE since WinUAE version 2.6.0. This is a feature of WinUAE that adds a black frame between refreshes. This reduces motion blur.

The result is:
~50% less motion blur on many 120Hz monitors (improvement noticeable in platform scrollers)
~90% less motion blur on LightBoost 120Hz monitors (big improvement, CRT quality scrolling)

If you combine both (1) and (2), especially at LightBoost=10%, you will get zero motion blur; perfect CRT motion on your 120Hz monitor. The two techniques combined makes it flicker like a 60Hz CRT; and have the motion clarity of a 60Hz CRT.


Animation of Black Frame Insertion

For people who has never seen black frame insertion, make sure you have a supported web browser and then click the below web-based animation of black frame insertion on a fast GPU-accelerated computer (e.g. Google Chrome):

If you are using a 60Hz monitor, this demonstrates 30fps with less motion blur via the black frame insertion technique. If you are using a 120Hz monitor, this demos 60fps with black frame insertion. If you are using 100Hz, this demos 50fps with black frame insertion. Note that 60fps black frame insertion (via 120Hz monitor) will flicker a LOT LESS than 30fps black frame insertion.

Remember, for 50fps / 60fps black frame insertion, you will need to run 100Hz / 120Hz, with a 120Hz monitor.

Last edited by mdrejhon; 27 October 2013 at 01:16.
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