LCD screens would look like a stained glass window if not for
the back lighting pannel. What we have are two sheets of glass
or plastic that are treated with a coating that if viewed under
a microscope would look like slots or bars. The front sheet and
the back sheet are placed so that one of them has the slots
vertical and the other one is horizontal so that no light gets
through.
There is a film of oily liquid trapped between the two
sheets along with a matrix of electrical conductors that would
look like a sheet of graph paper if magnified.
Those rows and columns are fed to the outside and if you
put a voltage on a row and another on a column, the liquid at
the point where the row and column meet bends light such that at
that one place, light makes it through the crossed lines to the
other side. That's one pixel and the glass at that point may
also be colored red, green or blue so that all the tiny dots end
up making a nice color picture.
For a LCD screen to work, you must have a back light. If
you could separate the back light from the rest of the screen,
the screen would look like a transparency and you could see this
colored image and look right through it to the rest of the room.
LCD screens sometimes have trouble showing complete
blacks as some light leaks through.
The better LCD screens use white LED's as back lights
and they can do better with black because the back light can also
be dimmed.
I bet, one day, that all TV screens will be LED. They
are more energy efficient which means batteries will last longer
on portable devices plus they have a few other characteristics
that make them better for screens.
LCD screens also have a temperature restriction that
most people do not need to worry about. They will sort of freeze
in very low temperatures and the display will get sluggish.
Some gasoline pumps here in the US have been known to
have their displays stop working when it gets extremely cold in
Winter.
"Mrs. Lynnette Annabel Smith" writes:
> Dane
>
> LCD uses liquid crystal display whereas LED uses millions of small LEDs.
> The latter can I gather give you higher resolution and a sharper picture.
>
> That's my understanding. I don't have a lot of time just now so will have
> to leave it to you to research if you want to corroborate my comments.
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