Motion Blur On TVs

Motion Blur Overview

You may want to check out my article on how LCD TVs work to better understand what will be talked about here. Moving on, motion blur is very easy to spot, but harder to fix. Simply put, motion blur is the streaking of rapidly moving objects in an image or scene while viewing a TV. Another way of explaining this with just different terminology. Many people in the industry refer to the streaking of the objects in the image or scenes as artifacts.

There are often many different reasons to why there is a series of motion blur when watching a TV. Anywhere from the original capture of the image having been a bad source or the scene could have had a bad exposure.

I’ve gone ahead and listed the most common factors to motion blur in modern day TVs.


 motion-blur-trt
What it is: Obvious streaking of objects in a image or scene.
Why it matters: Scenes look more accurate and detailed. Let alone crisp and clear.
When it matters: While playing video games and watching sports.

Motion Blur Factors

Contrary to popular to belief, the introduction of newer TV technology has actually brought about more motion blur factors than they have attempted to fix. Granted, the most recent have been very great and do an amazing job. Still, here are some factors listed below.

Pixel Response Time LCD TV technology needs to ‘twist’. The time is takes can be slow and produce a unclear image if not handled properly.
Source Shutter Speed The original capture of an image or scene could have been poor. This leads to an unclear image or scene that the TV cannot fix.
Eye-Tracking Humans are not perfect as much as we may like to believe. LCD TVs have come very far, but we only come so far as well.
Input Upscaling and Resizing In my Input Upscaling article I take about resizing resolutions. When this happens some of the quality can be lost and can cause motion blur.
Compression Artifacts Often time the source of an image or scene can be a very large file size. Thus, a compression of the file may need to be done. This will lead to artifacts and a loss of quality.

These are the most common and often times are very easily fixed.

Motion Blur Fixes

The most common way to eliminate motion blur is through a strobed backlight. Compared to other TV types such CRTs which flash their pixels, a LCD does not. This leads to motion blur as the pixels remains lit and does not just turn on and off. Think of it more as light-up-and-hold. This is where strobed backlight comes in. Turning off the backlight for a very short period of time will reduce motion blur by shortening the time the LCD’s pixels remain lit.

Now, like with most problems, once you know what the issue is, you can begin to produce a solution. Many different manufacturers have tackled this issue to help bring the smoothest picture to their customers. Listed below are some technologies that have been released and a little bit of how they work.

Clear Motion Rate Developed by Samsung to reduce motion blur. Also known as LED Motion Plus.
Aptura AKA ClearLCD, Philips use strobe backlighting to reeduce motion blur.
SPD (Simulated Pulse Drive) This is devloped by BenQ and also known as “black frame insertion”. Though very similar it is a little different. A black frame is literally inserted to mimic turning off the backlight, but is often much faster than tradiotnal methods.
Scanning Backlight This was developed by Sharp and they have the TV flash the backlight from top to bottom in between every single frame to help reduce motion blur.
LightBoost Developed by nVidia to combat motion blur. It helps keep pixels dark while the LCD refreshes.
Motion 240 Developed to combat motion blur in a traditional way, LG released this method with their PC gaming monitors. I find it to often work well.
Clear Frame Traditional method by Toshiba.
Motionflow Traditional method by Sony.
Clear Motion Drive Very basic method developed by JVC.

LED and OLED Differences
oled-trt

OLED and the Sony “Crystal LED” TVs are a little bit different than your run of the mill LCD TVs. They implement the ability to not only turn zones of the TV off like many others, but they individually control each pixel. This allows for a higher threshold of control over motion blur.

Though, the biggest takeaway here is that they are still an LCD at it’s most fundamental. This means they are still light-up-and-hold like I talked about earlier. This means that even though they dramatically help with motion blur the OLED and “Crystal LED” technologies are still not as great as they could be.

Conclusion

Motion blur is the very basic result of current industry standards. I believe most people will not notice much of any blur with most of the techniques that have been developed to combat it. Though it is still very much something to not be taken lightly if you’re trying to watch the big game or are trying to pull an all-nighter playing video games.
I hope this helps iron out some of the kinks with motion blur on TVs.

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