Re: TI-H: Backlight
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Re: TI-H: Backlight
Sorry, but you need the LEDs positioned far above the screen to light
it. you might as well use a mini flashlight then. You cant have even
super brights closer than an inch from the front of the screen to light
it completely. Also, the LEDs glare VERY BADLY when above the screen. My
system uses them behind the screen and uses a difractor to spread it
out. I havn't tried it yet, but it may be possible to build the
diffractor from plexi-glass, almost halving the price to $20 or $30!
THAT IS A BACKLIGHT!!!
>
>What if we just use green LEDs? I don't want to take credit for
someone
>else's idea, because I saw it somewhere else on the web, but three
LED's
>positioned around the screen can do the trick. Just add resistors, and
>you've got it.
> Only problem is diffusion. The light would get weaker near the
middle
>of the screen, but maybe that can be dealt with.
>
>Its cheap, and it doesn't use much power.
>
>
>-----Original Message-----
>From: Gregory Whitmore <gfw9941@usl.edu>
>To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
>Date: Monday, November 24, 1997 7:43 PM
>Subject: Re: TI-H: Backlight
>
>
>>I have found a better way to do the backlight. The only problem is it
>>costs $95.00 and it HAS to have an external power supply. It has to
>>because it needs an inverter to use DC power. I forget the name of the
>>company right now, when I remember I will post. To install the thing
is
>>really simple though. You just pull the gray "mirror" from your screen
>>and put place this screen behind your LCD. It sticks using that static
>>kinda thing.
>>
>>Gregory
>>
>>
>>
>>
>>Richard Piotter wrote:
>>>
>>> Hi!
>>>
>>> I want to post it, but time and work have prevented me from even
>>> updating the battery expander page. I took a Sharp LM64P something
>>> backlit monochrome LCD apart. It is 640x480 pixsels, and the
>>> diffratction panel is really good. Lights the whole screen if cut
right!
>>> I don't guarantee your screen will work WELL with it, but I do
guarantee
>>> it will light it up. The screen lights fine. The problem comes in
with
>>> some newer screens (maybe it's newer screens, but I'm not sure). The
>>> problem is that to properly install the backlight, you need to cut
the
>>> rubber that holds the screen off and then peel the mirror off. You
put
>>> the mirror on the back (rough) side of the difractor and put a
diffuser
>>> on top, then the LCD. The problem is that some screens use the
mirror
>>> and polarizer at a different angle, and it isn't compatible with the
>>> diffuser. It dimms the pixels and darkens the background. It isn't
bad
>>> on some calcs, but it gets fairly annoying on others. Austin butler
had
>>> a "dim" calc, but he got it and said it took a while to get used to,
but
>>> that it wasn't too bad. All I can say is you can try. The problem is
it
>>> it is a dim one and you decide not to do it, it is nearly impossible
to
>>> put the mirror back on without looking VERY strange. It will have
air
>>> bubles and dust, no mater how you replace it. If you like you can
try
>>> with just the corner, but my experience shows that if the mirror is
a
>>> piece of thick plastic and the one that doesn't work as well (It
works,
>>> just dimmer pixels when the light is off) is a very flexible piece
of
>>> plastic foil. You'll know by pulling the corner off. If it is thick,
go
>>> for it. if it is thin, you may want to think about it. Try it if you
get
>>> a panel. I charge $40 for the whole job (it has to cover the cost of
the
>>> LCD panel I took apart). I got it from ALL electronics, but they
>>> nolonger sell it, so it is kindof my last priority. I have enough
for 4
>>> calcs, and will need 2 or three for myself, so you, austin, and I
could
>>> end up being the only person with these backlights unless someone
had
>>> the misfortune of ordering the wrong LCD or thinking they could use
it,
>>> but couldn't. I was on an LCD list before, so maybe I can purchase
some.
>>> It would be best to find a black ON white backlit screen. It would
look
>>> better, but I havn't found one yet.
>>>
>>> If you want it done, I can do it for you. I could send the piece
(fit it
>>> to my 82 first) but It is difficult and requires patience. I have
taken
>>> over half an hour just cutting the screen off, cause you obviously
can't
>>> crack it, and you can't cut those plastic ribbon wires. Tell me what
you
>>> want to do. I'll do my TI-82 before I do your TI-82, just to see if
it
>>> works well!
>>>
>>> Respond soon!
>>>
>>> Richard Piotter
>>>
>>> E-Mail:
>>> richfiles1@hotmail.com
>>> richfiles@usa.net
>>>
>>> The Richfiles:
>>> <A
>>>
>HREF="http://www.geocities.com/SiliconValley/Lakes/5081/Richfiles.html">The
>>> Richfiles TI Page</A>
>>> <A
HREF="http://www.geocities.com/Area51/Lair/8510/Richfiles.html">The
>>> Richfiles Model Building Page</A>
>>>
>>> ______________________________________________________
>>> Get Your Private, Free Email at http://www.hotmail.com
>>
>
>
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