Comments on: Toshiba 46SV670U Review

By: LCD TV Ratings

LCD TV Ratings — Mon, 20 Jul 2009 07:12:29 +0000

@No life: First of all Thanks! you are right. This was a detail that fouled me and cnet as well (in there first review of ClearScan 240Hz) at first :).The only two manufactures that actually quadruple 60 frames per second are Sony and Samsung. Toshiba uses ClearScan 240Hz which doubles the original frames to get 120 frames like a standard 120Hz LCD TV, while flashing the backlight much faster then human vision can perceive. This method is also used by LG and Vizio. Anyway thanks for the heads up and please visit this site again in a few days and you will see an in-depth review of this LCD TV where ClearScan 240Hz it’s explained. I’m going to modify also in the specifications area.

By: No life

No life — Sat, 18 Jul 2009 23:22:30 +0000

Also, let me clarify why having a native 240hz set is actually a disadvantage vs. faux 240 (ClearScan240).
Artifacting!!! Lets say I have a 60 frames per second source –which is what you’re usually watching unless you pop in a dvd/blu-ray– and I have a native 240hz set. What’s gonna happen, is my TV is now creating 75% of what I see on screen. This leaves so much room for artifacting. Lets use the XBR7/8 as my example. Ever seen that set pan around a scene with lots of little slightly moving details? A top down view of hundreds of birds flying… or grass swaying in the wind while the screen pans around. You’ll notice it begins to artifact like crazy.
Even standard 120hz sets seem to handle this better than a native 240hz set. I’m not saying 240hz is bad– but it’s not quite ready yet in my opinion and needs to be further developed before being implemented into more sets.

By: No life

No life — Sat, 18 Jul 2009 23:10:14 +0000

This is NOT a 240hz tv. It is a 120hz TV with a “240 hz effect”
“ClearScan 240 advanced frame its actually means 240Hz refresh rate…” WRONG! Wrong wrong wrong. You even used the word actually!
To explain, lets start with 120hz. Now, using Toshiba’s Clearframe technology, we’ve created a frame in between 1/60 and 2/60 frames. So we have a 1.5/60 (2/120) frame here, that was created by looking at information from frame 1 and frame 2. The TV buffers this information rather than displaying the source in realtime. This allows further image processing and less artifacting. So that’s 120hz. Now the TV is going to use a backlight interpolation technique to trick your brain into seeing 240 frames per second. Here’s how they did it:
So, I’m looking at frame 1/120. The backlight is going to show me one strip of picture, about 1/3 picture and 2/3 black. It’s almost like the black bars you see on 2.35:1 aspect ratio movies on a 16:9 TV, but bigger. Now, we’re still on frame 1/120. The backlight is then going to show me that same frame, except this time around show me 2/3 picture, and 1/3 black (The black now being a horizontal strip down the center of the screen.)… basically an inversion of last time.
The human brain is going to see all of this, and perceive it as 240 frames. Now whether or not our eyes can actually see 240 frames is irrelevant. Your brain is seeing the picture as being smoother and without the “Human Persistence of Vision” which causes the picture in many 120hz sets to appear “moving too fast” or unnaturally.
This is nothing new. Sharp’s very first 120hz TV (LC52D82U/92U) did something very similar to this, except rather than taking the 1/3 black, then 2/3 black approach that Toshiba did, it simply blacked out half the screen on frame 1, and then half on frame 2, rather than blacking twice on the same frame. Toshiba’s method however, is definitely superior.
Regardless, this is a BEAUTIFUL set. I honestly thought I was looking at a high-end Plasma the first time I laid eyes on it, and would recommend it over the competition.
Pleas, do your research before posting “specifications”. It makes this site look alot less credible.
…Or you could hire me and never have this problem again =)