Re: TI-H: Backlight


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Re: TI-H: Backlight



How do I get/build the Diffuser?

Gregory Whitmore wrote:

> When you peel off that gray "mirror" from your LCD and compare it to the EL
> panel that I use. You can't tell a difference. When it is off, everything looks
> like a stock calculator. When the unit is on, it looks like an indiglo watch.
> You just have to adjust the contrast a little to make up for the extra light.
> It actually looks damn good.
>
> Richard Piotter wrote:
>
> >  it's not better, in my own opinion, if you HAVE to have it plugged into
> > an external supply to run it. My option costs only $40 (maybe less), and
> > it lights the entire screen nicely. You will STILL have the SAME PROBLEM
> > with the DIMMER pixels and DARKER background. It has to do with the
> > polarizer. I hope you figure it out, but as long as mine works, it's
> > fine. I will have to use a different brand or model screen, cause these
> > are nolonger sold, but many monochrome displays use this setup to light
> > up, so I just need to look!
> >
> > >
> > >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
> > >
> >
> > ______________________________________________________
> > Get Your Private, Free Email at http://www.hotmail.com




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