Re: TI-H: Backlight

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Re: TI-H: Backlight

Surface mount LEDs exist but:
    1. they're expensive
    2. they're a pain in the rear to solder in place.
    3. A PCB would have to be used behind the LCD
    4. there is no room for a PCB

Wes Mininger wrote:

> I have a Sony Cd player that I got about 3 years back or so that had
> backlit buttons and a backlit screen, I have taken it all apart and there
> are some *very* small leds underneath, so if someone could find out where
> to get something like those, they would work perfectly because they are
> small and (im assuming) they use little power.  the cd player I had had 2
> different colours in about a 2X1mm led... about 4-6 of them under the
> screen (they are also very flat) would work much better than ordinary lcds
> and they would fit alot better as well... I wish I could tell ya the name
> of them but I have no idea...
>
> On Mon, 24 Nov 1997, scross wrote:
>
> :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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