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Project Owner: Paul

More Information about connecting Laptop LCDs to computers. This was a reply to an e-mail I received

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I do not know the right way to choose a panel but I guess you could say the right panel is one that you are able to find pin out information for and meets a few specifications.

Once you have some panels get their part numbers and see if you can find a datasheet for them.

Some places to look for datasheets are:
http://www.datasheetarchive.com/
http://www.datasheet4u.com/
http://www.alldatasheet.com/

And others you can find by googling the part number. Normally you would leave the last few digits off the part number as you will then be able to find compatible variants.

For example: My panel came from a Compaq Armada M700. The part number of the panel is LTM14C521E I was able to find a compatible datasheet here: http://www.datasheet4u.com/share_search.php?sWord=LTM14C421E&x=409&y=27 Which is for LTM14C421S.

If you open that datasheet you will notice it says "LVDS Interface" under features, it tells you the supply voltage is 3.3V and on page 6 it gives you the pin out. All important things you need to know.

It is also important to note that the backlight inverter is separate to the panel so its specifications are not covered in the data sheet only the panels requirements from the inverter are shown.

I have not been able to find a datasheet for any of my backlight inverters but if you have some knowledge of electronics you can work out how to get them going. If the laptop computer still works you can power it up then measure the signals supplied to the inverter board.

You can get a basic idea of pin out by studying the circuit board. Looking for the input bypassing capacitors on the supply connection. The control signals will go to transistor or similar buffers and the track will be thin. The ground connection will have thick track and or go to a ground plane. Often there is more than one ground connection.

Normally it has a main supply possibly in the range of 12 to 25V and a few other low voltage signals that control back light on and off and brightness normally a couple of volts. These can be produce using variable regulators like LM317. I do not recommend using resistor dividers because you can easily damage the inverter - Like I did.

If the laptop works and has brightness controls on the keyboard you can find which pin controls the brightness and the voltage range used by measuring while changing the brightness.

I have found that the inverter requirements of the LCD panel are quite similar so you should be able to mix and match inverters with panels to get a combination that you can use.

Last part required is the PC motherboard with LVDS or LVDS module that connects to the motherboard. This will be supplied with pin out information in the manual or datasheet. So you will only need to create a connecting cable to go between the interface and the panel.

Also note there are many manufactures/ distributors of embedded and industrial computer systems. They normally stock LCD panels, Inverters and Motherboards designed for this purpose. So if you have some money and do not want the challenge you can buy an off the shelf solution.

Try:
http://www.icoptech.com/index.asp
http://www.advantech.com/eplatform/
http://www.icpamerica.com/
http://www.adek.com/index.html
And others you can find with google

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If you like you can discuss this topic in the forum below.

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Connecting a LVDS LCD to a Computer At 2009-07-28 07:07:20 From tino geisReply To This Post
hello..
i have one ask., i have a old laptop lcd 10", and i want conect to my pc,but i don`t have mini itx motherbord . can i conecting over my grafic-card?
sorry for my bat english:-(

Re: Connecting a LVDS LCD to a Computer At 2010-02-16 18:03:18 From PaulReply To This Post
It is not possible with out buying a special adapter that converts the VGA or DVI to LVDS. They are expensive to buy. You are better of getting a real LCD monitor for your computer.

Connecting a LVDS LCD to a Computer At 2010-02-15 22:19:25 From meReply To This Post
hi, i didn t understood how u connected the lvds controller on the motherboard ( i don t have this controller so i can't see if there is any connector under it ? ) thx a lot

Re: Connecting a LVDS LCD to a Computer At 2010-02-16 17:59:56 From PaulReply To This Post
Yes there is a connector under the LVDS board. Not all motherboard have it.

Connecting a LVDS LCD to a Computer At 2011-02-10 03:54:23 From MichaelReply To This Post
Hello Paul! I want to ask you about my problem. I have Via EPIA-TC with LVDS-05 module installed and Data Image 640x480. Is it possible to connect this panel to lvds-05 module? I would be grateful for your help.
Here is a datasheet:
http://www.elektronik.ropla.eu/pdf/stock/dic/fg080010dncwag01.pdf

Re: Connecting a LVDS LCD to a Computer At 2011-02-10 20:29:32 From PaulReply To This Post
It looks like you have a parallel TTL type LCD. Not LVDS. So you would need
I think you need something like this to do it http://www.logicsupply.com/products/rgb_01
But I don't know for sure. You will need to research it.

Connecting a LVDS LCD to a Computer At 2011-12-14 01:10:11 From Bon DotReply To This Post
Hi, good day. Can I ask something? i have a mother board ENDAT-7105M. This board has a LVDS connector and I have an ECS Laptop. The laptop main board is defective. I want to connect the LCD of the laptop to the endat-7105M main board. The laptop lcd has a 60pin and the endat board LVD connector has a 40pin. How can I know the pin configuration of the endat board and the ecs lcd so I can connect each other. Thank you very much.

Connecting a LVDS LCD to a Computer At 2012-05-09 02:50:46 From TomislavReply To This Post
Yeah man :) Nice work u do there,, I am new here.. My monitor is LTM14C421E like yours.. is there any chance to connect on enytihing else .. my eng is bad.haha. XD.. i have mother board of lap it is working but sound dosnt works ,,, i must have .. how do i say double monitor in my desktop computer ,, and that litle monitor is nice so .. i have trouble to connect ,, is there chance on DVI exit on graphic card to connect .. or something cheep (low cost).. i like idea of use this lcd monitor like extended desktop.. :)
yeah i write so much now,, thx man,, nice day

Connecting a LVDS LCD to a Computer At 2013-03-13 23:19:40 From JoseReply To This Post
Hi , I am new one in this , So Can you pls help to get the LVDS cable signal details


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