Originally posted by: f4phantom2500
Originally posted by: unclebabar
CRT (cathode ray tubes) operate by firing an electron beam from the back of the tube to the screen which excite phoshors on the screen creating colors. Obviously you get 1/r^2 losses, which shouldn't be a big deal if you are far enough away (re: getting a electron beam shot at your eyes). TFT (thin film transistors) operate by varying the amount of electricity to tiny transistors in the screen. You also have a backlight, which I don't have any information to comment on, but assume it's nothing extraordinary, alhough if you want the brightness cranked up that may be a factor to consider. Of course there may be other reasons and some or all of this information may be totally wrong, as I do not work in the industry.
if i'm not mistaken, it takes a little bit of time for the crystals (i guess is what they're called) on an lcd to change colors, which is why they have a response time, and a crt operates as quickly as the electrons can shoot down the tube (
speed of light lol)...however on lcd's that can go like black to white to black...or however they rate it, in like 8ms or less it's not a big deal at that point anymore because it's practically instantaneous.
Electrons
do not fire at the screen with the speed of light Their speed is dependent upon the acceleration they receive, which in turn depends on the voltage difference between the electron source and the electrodes by the screen.
Flickering is not a problem for most people if the CRT refresh rate is kept above 85Hz. Thus, ignoring flickering, it is reasonable to say that CRT and LCD has the same effect on eyes of the user (provided the same screen size, viewing distance etc.). A person that sits in front of the screen 16/7 will equally screw up own eyes regardless of the monitor type. That is due to the following two reasons:
- We uncounciasly forget to blink our eyes in front of a bright source, which is not good for the eyes
- By looking at a monitor, we essentially look at one very limited area in front of us. It is not natural for eyes to be pointed in one direction (as well as focused at a fixed depth). Muscles that control eye position get strained very fast and worn out, thus resulting in their worse functionality in the future (read: worse vision)
However, as it was already mentioned, the drawback of the CRT monitor is the leftover radiation from electrons bombarding the screen. It does not nessesarilly affect the eyes, but it does affect the overall health of the user. For example, a man that sat in from of a
6-7 year old
19" CRT monitor (note, I am talking about considerably older CRT's, I am sure that is not the case anymore) for straight 48 hours would very likely loose his ability to reproduce. I do not, however, have a source to support the last statement. That information was provided to me by an older professional.
Getting back to the main topic of the thread, this is a great price for someone that is willing to deal with the rebates. It would be great if someone could provide an insight on quality of these rebates.