Refresh Rates

[petersmart]

Bit of an odd question - but it has me a bit puzzled.

I recently bought an LED HD TV which I am also using as a monitor.

The small info leaflet I got with it says that the refresh rate is 60Hz, but I am able to take shots from it of my pictures up to 1/3200 sec.

On my old CRT monitor this would have been impossible because of the refresh rate resulting in a few bars only of the picture.

So can anyone explain why this is possible now.

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[arad85]

So can anyone explain why this is possible now.

Yes.



Oh... you want me to explain!

A CRT TV is a raster scan device that uses the decay of the phosphor, the response time of the human eye and the fact it is refreshed every 1/50th of a second (the same phosphor isn't, but the one vertically below is which is enough) to give the impression of a solid picture.

The LCD is an "always on" device that updates it's pixels 60 times a second.

Even with a 1/8000th shutter the LCD will show an image (it'll be dim, but it'll show an image....).

 

[petersmart]

Yes.



Oh... you want me to explain!

A CRT TV is a raster scan device that uses the decay of the phosphor, the response time of the human eye and the fact it is refreshed every 1/50th of a second (the same phosphor isn't, but the one vertically below is which is enough) to give the impression of a solid picture.

The LCD is an "always on" device that updates it's pixels 60 times a second.

Even with a 1/8000th shutter the LCD will show an image (it'll be dim, but it'll show an image....).

Ok I get it so no scan then.

Thanks for that simple explanation.

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[arad85]

Ok I get it so no scan then.

Exactly