78Views9Replies

Author Options:

laptop lcd hack help? Answered

hi, is it possible to make a lcd monitor from old laptop screen that is powered by usb connected to your new laptop?

Discussions

0
None
ptkrf

4 years ago

First: USB can't send enough data for any decent screen resolution at appropriate refresh rate. You could take an old LCD, buy separate driver hardware (http://www.ebay.co.uk/itm/Compatible-R-RM5251-LCD-... and plug it in laptop's vga output port but I doubt USB has high enough power output to power entire monitor even if you use step up converters. You may be able to draw power from laptop battery however...

To sum it up: It may be done to some extent but likely not as you imagined...

0
None
mmathavanptkrf

Answer 4 years ago

Oh okay thank you. I was just trying to see how the USB monitors you buy work. I guess its not really possible unless I had an LCD that required low output. I was trying to make something like thishttps://www.kickstarter.com/projects/slidenjoy/slidenjoy-double-or-triple-your-screens. Using my old laptops.

0
None
ptkrfmmathavan

Answer 4 years ago

I see. USB 3.0 can actually provide enough data flow for two HD displays at 60Hz (I thought you wnted to use "normal" usb - USB 2.0)

Max power output is dependant on laptop you are using but I doubt it could go much higher than 2A which at 5V (USB voltage), gives you 10W. Your LCD almost certainly used more than that for backlight but I may be wrong.

You could do some hardware hacking and remove opaque part of LCD and let LC part (the one that manages colours) work on natural light from background (LCD controller without backlight uses very little power).

You would face a problem when you would have to write custom drivers for USB video output and you would also need some special hardware for decoding signal as USB only outputs one differential signal.

As I said in first comment, it could be done to some extent but not exactly as you imagined.

And to comment "slidenjoy": it is never a good idea to add weight to laptop's monitor as those hinges are the first things that give up even without extra weight...

0
None
mmathavanptkrf

Answer 4 years ago

yea I wasn't going to make it exactly like that. But wanted to make it portable and be used with USB.

0
None
ptkrfptkrf

Answer 4 years ago

Also I failed at looking at my cheat sheet: US.B 2.0 has high enough bitrate to power full HD monitor at 60Hz.

0
None
rickharris

4 years ago

Almost certainly not possible - sorry.

0
None
mmathavanrickharris

Answer 4 years ago

thank you, but can you tell me how this would work then? i wanted to create my own using old laptop screens. https://www.kickstarter.com/projects/slidenjoy/slidenjoy-double-or-triple-your-screens

0
None
rickharrismmathavan

Answer 4 years ago

You would need the drivers for the LCD screen - These are most likely part of the mother board in a lap top.

In the long run a cheap monitor isn't a big expense

0
None
Josehf Murchison

4 years ago

It would be easier to connect it to the serial port and weather the laptop is designed to support a second screen but yea it can be done.

If you have an old flat screen you connect the flat screen input circuits to the laptop inputs and plug it into the serial port on a laptop designed to support a second screen.