laptop lcd to moniter

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i got a loptop dell inspiron 7000 dosenot wprk anymore but the lcd is
still in good shape. I disassemble it it got an inverter in it.

i was wondering if i could turn it into a moniter.
i saw an ad on ebay for a a collection of wires and inverter and a db 15
conector circuit but i cant buy it because i'm in syria.

i would like to build something easy.
i know that lcd of laptops take digital signal but moniter not
what about dvi conector?
the lcd is samsung lt150x2-124
other numbers on the back
numbers on the inverter dp/n 0009286c rev.a01
i posted this in another section i didnot where to post this

Re: laptop lcd to moniter

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Hi I was just loking at the post here.

I do not know much aboutthis stuff, I have never had a laptop.

Anyway I googled some things.

This seems to be the panel

It says:

Signal Interface : LVDS (1 ch, 6-bit)

I googled that.

All seems rather complicated.

As I understand it the inverter is to increase the voltages to power the
so the laptop voltages must be feed through.
But then there are the data signals. whihc I think go through on a twisted
pair of cables.

Howver I do not know the protocol used to encode and decode the data

Anyhow it seems rather complicated and I do not have a lot of time but I
have been googling stuff

This seems interesting

It looks like someone there did something to do something similar ie convert
a hdmi signals
into the signals the laptop monitor needs.

more here

But it seems to me you need a circuit to conver hdmi to ldvs and the guy has
made somethign to do
that I don;'t know when he has any to buy or at what price.

to me it would seem a lot easier to just buy a cheap monitor!!

Anyway not sure if that is what you were looking for but it seem to me the
solution is difficult
and not practical unless you can buy a cheap convertor.

There is also this

All rather technical, however, I wonder what happens in the laptop because
it much generate signals for the
monitor and for it's ports to drive an extrenal monitor.

Maybe it has a chip inside which converts hdmi to ldvs, but it all sounds
too difficult to me.

I am prety much a novice about this but I do have some electronics knowledge
(which is why I was
interested) , but it all sounds rather difficult.

Maybe I wil look at it again there is lot to understand and learn.
too difficult to me.

Re: laptop lcd to moniter

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But it seem to me you could buy a cheap monitor more easilly ie a second
hand monitor.

Re: laptop lcd to moniter

R. Giggs. wrote:
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Based on your suggestion, I can find a TI person here having a
suggestion for a two chip solution.

The DVI/HDMI side, is encoded with TMDS. It allows the
receiver to be AC coupled, and the TMDS code is an attempt
at DC balance to within a reasonable percentage. The 8B10B code
has been around for a while, and was used on things like fiber
optic modules.

When I look at the second chip, LVDS transmitter, that appears to
send unencoded digital patterns. Rather than an 8 bit to 10 bit
encoding, it just sends the data bits. The distance between the
sn75lvds83b chip and the panel, should be kept short
(like perhaps six inches or so).

On page 16 of sn75lvds83b.pdf, you can see the flat ribbon cable
between the sn75lvds83b.pdf and the panel, is terminated with 100
ohm differential terminations. The ribbon cable should also
have an impedance in that vicinity. Reusing the cable from inside
the laptop, makes sense for this purpose.

        DVI or HDMI  ---- TFP403 ------------------ 75lvds83b ----------- LVDS
LCD panel
        TMDS encoded      Digital    (Parallel                100 ohm
                          Receiver    Interface)              flat cable

There's a specific pattern that the bits have to be sent in.
I'm don't pretend to know all the details. The pattern and order,
should be in the LCD panel datasheet. Worst case, if
for some reason the patterns didn't match, you'd need a frame
buffer memory between the TFP403 and 75lvds83b. (The same thing
you might need, to convert from an interleaved source, to a
progressive output.) As long as the two standards send the pixels
in the same order, the design could be as simple as that two chip
suggestion. Or, perhaps if some company made a one chip solution
(which might be a part used on an "input" or "AD board" for an
LCD monitor), that would be another way to do it. Since
the two chip solution probably won't have any place to
do "re-sampling", the video card will be required to
launch its scan pattern at the "native resolution" of the
panel. I don't know where the re-sampling is done normally,
but it probably wouldn't make sense to be doing it in the
panel itself. That would be more of an input board function.

So if the panel was 1280x800, you need to set the video card
that way as well. If you wanted the whole thing to be Plug and
Play, you'd need to prepare your own EDID I2C chip with
resolution information.

The AD board, normally has a few of those different kind of
functions, to handle the various possibilities for input
data format, before making an LVDS set of signals for the panel.
The above two chip solution, while being relatively low
tech, also doesn't handle anything except the exactly-right
digital bit pattern for the panel.


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