Re: TI-H: Re: LZ: Backlighting


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Re: TI-H: Re: LZ: Backlighting



Mainly people have turned from backlighting to sidelighting
on this thread. Just remember how LCD's work:they block
light that would normally pass.
ASCII art:
-------------------------------------------Glass plate (upper)
**********    ***************              LCD layer (*=dark)
+++++++++++++++++++++++++++++++++++++++++++Reflective layer
-------------------------------------------Glass plate (lower)
The liquid crystal is in the second layer. It is normally
transparent, but turns turbid and opaque with current. Then,
light coming in from outside doesn't make it to the reflective
layer to be shone back in your face, so the area appears dark.
The trick with sidelighting is to get the light in on the top of
the screen--i.e. come in from above the upper plate. The difficulty
with backlighting is in getting the light through the reflective
layer. These aren't necessarily insurmountable, but they do require
some thought. I've noticed a gap between the LCD and the case
on the top--this would be the place to mount stuff (which
I believe people have been doing....)
Anyhow, sorry for the length, but thought y'all might
like to know how these things work.


--Jon, N9RUJ
jnieho38@calvin.edu              www.calvin.edu/~jnieho38
"Outside of a dog a book is a man's best friend.
    Inside a dog it's too dark to read!"
--Marx (Groucho, not Karl)


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