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'[EE] Increasing laptop lcd brightness'
2005\12\27@141120 by Mario Mendes Jr.

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Hi guys,

I have an old dell Latitude (cpi300xt) laptop that I use in my car as my
gps navigation/mp3 player etc (yes, it's got a wireless card just in case
I decide google something while driving, talking on the cell phone with
one hand and taking notes with the other all at the same time =).

The brightness of the lcd is OK during the day, but if there is bright
sunlight from certain angles, it is hard do see what's on the screen.  I
wanted to make the screen a lot brighter so that it would be easier to
read at those conditions.  Note, I do not need it to be spectacularly
better, only better than now.  I have found many sites that sell
replacement light sticks for the screen as low as $10, and I'm sure it
will be a brighter than it is now (since it is so old and it tends to dim
with age) but I'm pretty sure it won't be as bright as I'd like it to be.

Question: besides trying to change the light stick, is it possible to
tweak the inverter to make it brighter, or would it be necessary to use a
different converter (in which case it may not be possible due to space
constraints inside the lcd casing)?

Thanks.


-Mario


2005\12\27@144343 by Josh Koffman

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On 12/27/05, Mario Mendes Jr. <spam_OUTmarioTakeThisOuTspammmendes.com> wrote:
> Question: besides trying to change the light stick, is it possible to
> tweak the inverter to make it brighter, or would it be necessary to use a
> different converter (in which case it may not be possible due to space
> constraints inside the lcd casing)?

While not a direct answer to your question, you might want to look
into some anti-glare films. I believe 3M made one that essentially
eliminated ambient light hitting the LCD, thus increasing the
perceived brightness quite a bit. Think of micro horizontal little
shelves right in front of the LCD. Ambient light hits the shelves, not
the LCD. At least, I think that's what it was. If it was 3M, it was
probably an offshoot of their privacy filters.

Josh
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2005\12\27@154420 by Hector Martin

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Funny you mention that now - my laptop LCD (a great one BTW - 1400x1050
- already had a CCFL lamp repair) just died on me while in the car. Lamp
brightness was too low (minimum? maybe less), then flashed on full or
brighter for a couple of seconds, then nothing. Now I can _only_ see it
if light hits it at the right angle. Time to investigate...

By the way, changing the CCFL lamp in a laptop isn't a big deal (as long
as you can actually get to it - you might have to remove lots of
pieces). You might be able to find one with a higher rating and replace
the inverter to go with it, or hack it to work with two lamps (maybe on
either side of the screen). The specifics depend on the
inverter/CCFL/screen design, but if all you want to change is lighting
it can be done.

--
Hector Martin (.....hectorKILLspamspam@spam@marcansoft.com)
Public Key: http://www.marcansoft.com/hector.asc

2005\12\27@205153 by Mario Mendes Jr.

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I did a little surgery to the laptop's screen tonight and found out that
unfortunately, even if I managed to get a different inverter to fit in
there, there actually no room in the assembly for a second lamp on the
other side of the screen.  Bummer, I was actually hoping that was
eventually going to be what I needed to do.

Worse case scenario I could get one of these new 7 inch lcd monitors since
the laptop does have a video port, but it's like $200+ for each one of
those (have not tried ebay yet).

I may just have to live with the glare or at least try the anti-glare
films suggestion from Josh.

-Mario

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