Refresh Rate Explained - 100Hz, 200Hz and 600Hz Compared | Sony Digital Photo Frame
Refresh Rate Explained
Trying to choose a Tv today can be difficult. Very difficult. One of the most widely debated features of flat panel Tvs is the ever confusing Refresh Rate. There are quite a number of different refresh rates being featured on today's Digital Tvs. 50Hz, 100Hz, 200Hz, and 600Hz. These Refresh Rates can no ifs ands or buts divide opinion.
What is Refresh Rate, and why is it important?
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Every video we watch is made up of thousands of "frames". The refresh rate, or "Hertz" (Hz) is a quantum of the number of frames shown on your Tv screen each second. Remember in your younger years, when you were bored in school and used to draw a stick form in the top angle of every page in your book, and then flick through it speedily to make it look like it was moving? This is basically what your Tv is doing to yield petition on the screen.
It is refreshing (i.e. Flicking) through frames (i.e. Pages) to yield motion. Now the quicker you can flick through pages in your book - the faster and smoother the stick figures petition seems to be. Secondly, the more stages of movement you draw the stick form in on each page - the more natural it will seem to move.
So let's go back to our Tv - if the same needful is applied, then the Tv is able to show you a smoother petition if it can flick through its frames quicker. And by adding extra frames in in the middle of other frames - this causes the Tv to yield a smoother transition from one frame to the other. So, the more times the screen can be "refreshed" every second, the smoother the image's petition will seem to be.
The thorough broadcast signal we receive in Australia is 50Hz. That means that the image on your Digital Tv is refreshed 50 times each second. 50Hz is a fairly slow rate, and it is inherent to see blurring or judder in the picture when watching fast piquant sporting events or performance movies, or any scenes where the camera pans across very fast. So the way the Tv fixes this issue is to create intermediate frames and then insert them in the middle of the original frames. This is referred to as interpolation, or 100Hz Technology.
"100Hz technology doubles the number of frames shown per second which helps to sell out the blurring and is ideal for watching performance movies and sports."
To some people, the 100Hz petition can seem to be a bit "too" plane initially, but once you adjust, it can be very difficult to return to a 50Hz Tv, especially on a large screen. Today, larger and larger Tvs have come to be very accessible in terms of price. Now because the picture is bigger, you will notice things like judder even more.
The majority of these large Flat Screen Tvs (if not all) are 1080P Full Hd. That means that there is a lot of data being displayed on the screen, and all of that data needs to be moved colse to very fast for it to look smooth. On a large Flat Screen Tv running at 1080P and 50Hz, fast panning shots can show a lot of judder, because there is just so much image data being shifted colse to the screen, our eyes will pick up a lot of petition artefacts. So essentially, by doubling the number of frames, 100Hz removes the majority of petition judder.
So if 100Hz gets rid of judder, why do I need 200Hz?
Interpolation at 100Hz is good, but again, with a lot of Full Hd, high resolution article like Blu-Ray, Gaming and more recently 3D Technology, now available to every home, and 46" - 65" Led screens surging in popularity due to plummeting prices - there's more advantage to be had from your Tv doubling its refresh efforts. While 100Hz will no ifs ands or buts remove a lot of petition judder from Led Tvs and Lcd Tvs, the bigger the screen, the more apparent the remaining artefacts and judder become. So 200Hz was born...
By inserting 3 added frames in the middle of each existing frame, instead of one as 100hZ does, 200Hz processors improve petition smoothness added and follow in manufacture objects look more "solid". The aim of 200Hz is to keep objects such as Soccer Balls, or any small objects piquant very fast across the screen, from losing their shape, blurring or breaking up when being propelled across the screen. However, it's not as easy as just adding an extra three frames - that's not quite the extent of the technology. A processor inside the Tv looks at two sequential frames and then no ifs ands or buts creates three New added frames in in the middle of them.
Going back to our stick form analogy, that means drawing four times as many stick figures by using four times as many pages, and flicking through those pages at the same speed. This fact, however, is where some 200Hz Tvs follow - or fail miserably!
Imagine you've drawn a stick form on fifty pages, and can flick through those fifty pages in one second, without missing a page, and at a constant speed. Now double those pages, and you will find it harder to flick through the whole hundred pages without missing a few - let alone the same speed throughout. So your stick form may seem to move smoothly, then judder, then smoothly again. Now, dream trying to do that with two hundred pages. It's a struggle, and you are sure to miss a number of pages along the way. To put it one way - some citizen will do a good job than others.
This also rings very true for Tvs. There are some processors out there which do a much good job than others do. There are some 200Hz processors which don't quite cut the mustard, and you can see odd frames skipping, lots of inaccurate and seemingly unnatural movement. So beware - not all 200Hz processors are created equal!
A lot of Plasma screens seem to highlight 600Hz - they must be at least three times faster, right?
Well in short - not exactly! What 600Hz Sub-Field Driving does, with a 50Hz source like how our Australian Tv is broadcast, is split each frame into 12 isolate frames or "sub-fields", and then show them individually on the screen. What it does not do is create New frames. That means 12 sub-fields per frame in 50Hz (frames per second) creates 600 frames per second (50x12=600). The more sub-fields you have per frame, the more strict the colour reproduction and less picture noise.
So technically, 600Hz sub-field drive is not solely related to, nor is its original purpose, eliminating petition judder.
Why are the manufacturers causing all this confusion?
Because Plasma vs. Lcd technology is still the biggest turn over when it comes to selecting a Flat Screen Tv. The contrast in technology is causing manufacturers like Panasonic, Samsung, Lg and Sony to heavily promote features and benefits of their panels to attract customers.
As far as Lcd, and now Led Digital Tv Panels have advanced - the fact of the matter is that for smooth, natural petition in fast scenes - a Plasma is still superior.
With the way Plasma technology works, 100Hz or 200Hz isn't a useful highlight to have. But with Lcd and Led heavily marketing 100Hz/200Hz, from a marketing perspective they needed a number to combat that. Some added 100Hz before, but now 200Hz Led and Lcd have come to be more common, so they've started quoting the sub-field number - 600Hz.
The same thing happened with 1080p and 'Full Hd'. Lcd manufacturers introduced terms on their Tvs - purely from a marketing perspective - to try and deflect attentiveness from the fact that a good Plasma Tv produced a more "natural" picture.
In reality, the plasma manufacturers are being slightly misleading in how they market 600Hz sub field driving. In one way they are saying to customers that our 600Hz is a highlight that helps remove petition judder three times as much as a 200Hz Tv.
While this is not directly true - they are using it to promote a very true highlight of plasma technology - first-rate petition handling. There is a minute bit of "the pot calling the kettle black" when it comes to the Lcd manufacturers though. While it is true that 200Hz was designed to aid petition on a large screen Tv - the fact that the resulting image can often seem unnatural while fast scenes puts a big request mark over either this aids or hinders what the customer is seeing. The insertion of frames that are not meant to be there can make it all look a minute fake, in many people's opinion. If you do encounter that, it's best to disable it for that singular movie.
So, what is best? 100Hz, 200Hz or 600Hz?
In summary, for fast paced natural movement, Plasma screens are still superior. They do not need to create extra frames to eliminate petition judder, so the resulting image seen is not fake or unnatural. There are pros and cons for both Plasma and Lcd technology, and view will all the time be divided one way or another, but if you prefer a smooth, natural picture - even though Lcd and Led technology has improved immensely - a Plasma screen is still the way to go.
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Refresh Rate Explained - 100Hz, 200Hz and 600Hz Compared | Sony Digital Photo Frame
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