Linking Multiple TVs

Does anyone know how to link 4 (2 more more really) TVs together so that the resulting image is a HUGE image off the DVD player? I've had some luck making it 4 separate images (same one on each TV) but would like to know how to make one large image. Thanks!

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NachoMahma9 years ago
. Many of the news channels appear to be using a setup like you are talking about, only on a bigger scale. I've only noticed it in the last year or so, so I'm guessing it's fairly new technology and pretty expensive, but it may just be because large monitors have gotten cheaper. . Don't guess that really does you much good, other than confirm that it is possible to do. This should be an easy question on one of the video-related sites - try asking there if you don't get an answer here.
stric910r9 years ago
You'll have to adjust the signal for 2 horizontal and vertical syncs. It's all about timing. For a 2x2 matrix of Tv's, you'll need to divide the horizontal and vertical sync by two. The first screen will display the first half of the horizontal sync up to the 1st vertical sync. The 3rd screen will display the first half of the horizontal sync after the 1st veritical sync up to the 2 vertical sync. The second screen will display the 2nd half of the horizontal sync up to the 1st vertical sync. The forth screen will display the 2nd half of the horizontal sync after the 1st veritical sync up to the 2nd vertical sync. This is assuming the below orientation of the screens: 1 2 3 4 As mentioned earlier, it is all about the timming. This can be done several different ways, but you will need an output in your embedded system for every monitor being used. If you have further trouble, just research NTSC tv signals. Computer monitors will work off the same concept but they can have different refresh rates. Also, you'll need to take into account the aspect ratio of your screens. Your embedded system would have obtain the signal, store it, augment it, then push out each newly created signal to the respected screens (keep the time in mind). This would have to be done very fast. Basically all your operations would have to be done before the next line is created. So if you refresh rate (or vertical sync) is at 60 Hz, that means your processing of the signal would have to be done and the entire picture painted on the screen before 16.6ms. You'll need a fast MCU to do this project. Hope this post does not seem like a ramble. Please let me know if any body thinks the above is incorrect or if another way is better.
VIRON9 years ago
Easy method: 4 TV's with 4 cameras pointed at one LCD TV. Cams on the LCD TV because there's no flicker. Usual method: Needs fast analog to digital and four digital to analog converters, and a memory chip to hold the image, and lots of logic (or a fast microcontroller) to read out the image memory to the four TV's. Design this and you'll see it's easier to buy than to make one.
whatsisface9 years ago
You can buy junction boxes that do it for you, but they're v.expensive.
andy9 years ago
You might have more luck with a computer and attacted monitors, you can run a number of monitiors on windows as far as i know without any modification to the computer, the trick would be then finding software that suports multi screen. Hope this helps, Andy
flw9 years ago
Goodhart9 years ago
One would have to find a way to take the signal and divide it into 4 sections. Sending each signal to the appropriate set. Some TV camera's have this built in, but I personally don't know of an easy way to do it.