While LCD TV’s have grown hugely popular over the past couple years, their one major flaw is with regards to motion blur. You see, unlike a conventional TV, or plasma display, the refresh rate of an LCD screen depends on how fast the liquid crystals can be convinced to change colours. While the technology has gotten better in recent years, it’s still necessary for consumers to pay close attention to the refresh rate listed on any potential TV; numbers can range from as low as 2ms, to 15ms and higher. In this case, the lower number is definitely better.
Regardless, most people will notice that, when compared to more conventional TVs, this issue with refresh rates creates a bit of an annoying side effect, seen as motion blur. Sports, as a good example, usually look fine on conventional CRTs, or even plasma technology. But subject an LCD screen to a fast moving puck or ball, and you can easily see the problem in question.
In the interests of developing a solution, a number of TV manufacturers have introduced their own sets of motion-smart televisions, usually reliant on a feature dubbed 120hz displays. Sony, in particular, has an implementation known as MotionFlow, which is present in my current 47″ model. What the technology does is essentially double the frame rate of conventional film or television content, using interpolation to add extra frames to create what is supposed to be a smoother image. According to Sony’s own site…
“Not one, but two new images are added to the action, creating powerfully sharp images displayed at an astonishing 120 frames per second. You won’t miss a single detail of sporting action.
And now films and cartoons shot at 24 frames per second are made better too as Motionflow 120 inserts five new images, getting rid of any annoying judder or blur. What you’re left with is a superior reproduction of the original. You simply won’t be able to tear yourself away.”
You can even adjust the level of MotionFlow control, which is changes the extent of which images are added and processed in the creation of the final product. Yet, there’s a very large and glaring problem in this sort of fix.
When studies were conducted by a number of large TV manufacturers, the results indicated that viewers were extremely impressed by the way in which content filmed with an HD camera was displayed. Of course, this would mean convincing Hollywood to abandon their traditional 35mm lenses in favour of HD-specific cameras – a daunting and unlikely scenario. By incorporating technology like Sony’s MotionFlow, manufacturers could work to achieve the same sort of effect with current material, with the hopes of providing viewers a similar picture to that of HD-filmed content.
Of course, the results aren’t as good as one is led to believe. Films are shot in 24fps for a reason, and directors take notice of all the quirks of filming for such a format, including the speed at which the camera can be panned and zoomed. By taking content purposely filmed at such a speed, and increasing the frame rate by a huge degree, the result is an image that looks wholly unnatural. The one thing myself, and others, have noticed, is that many films viewed with MotionFlow technology turned on simply look too unnatural. While attempting to create a viewing experience that mimics the smoothness and quality of the natural eye, the end result is actually a film that looks almost too smooth, and far different from what the directors intended, and viewers expect.
Case in point, I tried watching Stanley Kubrick’s 2001: A Space Odyssey last night. While an excellent movie, the addition of MotionFlow technology simply turned many of the space sequences into a distraction, since all my attention was focused on determining what exactly was wrong. Once I realized my TV was playing games with my beloved 24fps, turning off what was otherwise supposed to be a useful innovation, actually made things better.
Further reading: Home Theatre Magazine has an excellent article on the topic of 120Hz which helped me understand things a little better. Check it out here.