tagliatelle
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Gives a TFT monitor less radiation than a CRT?
Apple & Radiation
- Thread starter tagliatelle
- Start date
AppleWatcher
Tigerrr
.
A CRT monitor works by firing a beam of electrons through a vacuum at a pattern of phosphor dots on the inside of the tube. It uses big magnets that deflect the beam, to make up the image on the screen.
So, you have fairly large magnetic fields, high voltages, the odd stray electron or two, etc...
A TFT panel displays an image by selectively allowing light to pass through a grid of individually controlled liquid crystal elements - thanks to it's cunning ability to alter (or not alter!) the polarisation of the light passing through it.
So, you have a light source (usually a flourescent tube, I think), probably not very high voltages, and um, well that's about it
Definitely less scope for radiation there...
Jim
So, you have fairly large magnetic fields, high voltages, the odd stray electron or two, etc...
A TFT panel displays an image by selectively allowing light to pass through a grid of individually controlled liquid crystal elements - thanks to it's cunning ability to alter (or not alter!) the polarisation of the light passing through it.
So, you have a light source (usually a flourescent tube, I think), probably not very high voltages, and um, well that's about it
Definitely less scope for radiation there...Jim
When an electron accelerates it gives out radiation. In CRT hitting the phosphor dots and stopping dead counts a large negative acceleration and so lots of radiation is given out.
Fortunately most of this radiation is stopped by the massive amount of glass and screening in the front of the monitor. However this is not that much shielding behind a monitor - just bear that in mind if you sit in a shared desk with people opposite you.
Hey Jim - I live in Cambridge as well. Big match tonight for the U's.
Roger.
Fortunately most of this radiation is stopped by the massive amount of glass and screening in the front of the monitor. However this is not that much shielding behind a monitor - just bear that in mind if you sit in a shared desk with people opposite you.
Hey Jim - I live in Cambridge as well. Big match tonight for the U's.
Roger.
alexachucarro
I'm 1/4 Basque you know?...
A TFT has next to no radiation. The level it does have can't do any damage to you anyway.
And I think Roger that a fast moving electron IS radiation. Beta to be precise. But I'm not sure. A Level physics is fading now!!!
The major problem is: if you're in front of a CRT and it's dark, your pupils open wider to allow in more light. Unfortunately, this lets in more radiation. So using a montor in the dark is really bad for you. But seeing a TFT is basically flouresant lighting with a picture on top. They do no harm.
Also a TFT draws next to no power from the mains. So cheaper to run!
And I think Roger that a fast moving electron IS radiation. Beta to be precise. But I'm not sure. A Level physics is fading now!!!
The major problem is: if you're in front of a CRT and it's dark, your pupils open wider to allow in more light. Unfortunately, this lets in more radiation. So using a montor in the dark is really bad for you. But seeing a TFT is basically flouresant lighting with a picture on top. They do no harm.
Also a TFT draws next to no power from the mains. So cheaper to run!