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I am working on a project where I need to connect a smartphone touchscreen display & digitizer assembly unit to PC or another smartphone, as a second screen. How can I connect a phone display to PC?
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This is going to require serious hacking.
The display connector is proprietary. The signaling protocol is MIPI, however other control signals, power sequence and timing are unknown. You have to find someone who already made this and use his results or get an oscilloscope to probe it out.
For touch signal it is entirely impossible. The iphone 6 display has integrated touch sensors, sharing the wiring matrix with the LCD. There is no digital interface to connect to on the touch cable, you have to implement your own capacitance multi-touch driver and sensing circuit, convert and process the raw signals then convert to touch events. To make matters worse, you'll need to sync the touch scanning with display refreshing, otherwise they will interfere with each other. I don't think this can be reverse engineered without equipment under a few million dollars.
In my opinion just get a cheap iOS device and use some screen sharing app to do it.
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Hi Tom, Thank you so much for detailing.
Other than iphone 6 display, is there any other phone display/digitizer that I can connect to my first screen (iphone or android) to work like a second screen? I have seen few stuffs like https://www.alibaba.com/product-detail/4... , https://www.alibaba.com/product-detail/S... , https://www.alibaba.com/product-detail/3... , etc. But not sure how can I connect these to my phone (android or iphone) and make these work like the second scree? Can you please advise Tom?
Kind regards..
What exactly are you trying to achieve? If it's outputting the screen to other devices, you can use existing protocols like AirPlay or lighting to HDMI adapter for iPhones, or other protocols on android. it's basically impossible to attach a second display with touch to the phone.
Hi Tom, I am basically trying to create a second display for existing phones, either by hardware or software means. Ex: NEC Docomo Media S dual screen phone. I understand that hardware linking is difficult. And also I can see many softwares that do somewhat what I require partially - like airplay, mosaic app, pinch app, mobile multiple display mmd app, etc. But they do NOT split the entire screens, they share only images, videos & few apps. But I need the entire display to be split into two halves - one half in each display, other in second display. Having said that, I dont want to buy an extra phone for second display. Makes sense? :)
No. Reverse engineering does not make sense at all, it will cost you hundreds of phones. So just buy another phone.
Its disappointing to know that adding a second screen & splitting the screens half, will be so tough. Sorry to burden you again, do you think is there any (cheap) way that I connect an extra display to phone? Thank you Tom.
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http://hackaday.com/2014/08/19/a-mipi-ds...
But this does not allow touch interface! Sad.
- de YOGESH GOPAL
Why are you trying to reuse screens of phones?
Why not just use a external touchscreen?
- de bart
This is an engineering project, where I have to create 2 displays in phone. Similar to NEC Docomo Media S phone. But I have to create a screen attachment as a detachable accessory for all phones. Thats why I am looking for a way how can I connect an extra display to a phone like iphone or other android phones. Is there any way?
- de YOGESH GOPAL
just buy a touchscreen that is already compatible with your hardware.
Arduino have touchscreen/ also .net frameworks also.
Here you can buy them
https://www.sparkfun.com/products/12725
Don’t try to reverse engineer a lcd to make it work its not worth the time.
If you don’t have the datasheet of the lcd you will have a hard time
- de bart
Hi Bart, Thank you so much for replying.
I have seen those Arduino / Raspberry touchscreens, but these are bulky - not thin enough. The only reason I am trying to get phone displlay as second screen is just due to their minimal thickness. Wondering do you know any other thin displays that can be connected to phone? I have seen few stuffs like https://www.alibaba.com/product-detail/4... , https://www.alibaba.com/product-detail/S... , https://www.alibaba.com/product-detail/3... , etc. But not sure how can I connect (No PCB) these to my phone (android or iphone) and make these work like the second scree? Can you please advise Bart? Kind regards..
- de YOGESH GOPAL
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