I have a project in which I am trying to use a Raspberry Pi Zero to display static content through a laptop screen. I am trying to make my unit as thin as possible and use as little power as possible. Previous searches have found solutions that would work, but are less than ideal for what I am trying to do. I would also like to mention that I am no electrical engineer and I struggle at reading datasheets and making sure I won't blow anything up, which is why I need your help.
An example of a previous solution: Some solutions mention using an LCD controller from eBay that had input and output in the form of HDMI, VGA, DVI and LVDS. However, these boards require something like 9V minimum, where I am trying to limit my build to a small 5V DC power supply. They are also massive in size and more importantly, height, which is also something I am trying to avoid.
My goal is to be able to power the Pi from a 5V 2.4A DC wall adapter, and power the screen through the micro USB port (micro USB > USB A Hub > micro USB cable) so that only one small external power cable is required. Eventually I would like to see if battery power is an option, but as far as this question goes, I am concerned only about the 5V power supply.
My idea is to use an HDMI cable out from the Pi that goes to a 40-pin TTL breakout board that is typically used to power small TTL TFT displays and takes a micro USB in for providing power. From that board, I would take the TTL and run it through an LVDS converter board to try and output something that can communicate to the screen that I have available from an old laptop.
The screen datasheet can be found at:
I ran out of links, sorry I'm new...
And the laptop screen model is: B156XW02 V.0
This is an LED backlit 15.6 inch screen that uses a single 40-pin LVDS connector to the motherboard.
Some Info/My Attempt:
I figure that from the datasheet about the screen, the LCD has a max Voltage of 3.6, and a max current of 400 mA (0.4 A) and the backlight has a max Voltage of 3.4 and typical forward current (no max listed) of 20 mA (Seems really low?). It also lists the LED power consumption at 4.4 Watts max, which leads me to believe if the Volts are at 3.4 max, the current would be 1.29 amps max?
It seems to me that the max Volts required is 3.6 and max current required is .4 A or 1.29 A (depending on what is correct)? Since the Pi can output 5V and .5 A from the micro USB out (after the hub), or 5V and 2A from a special PiHat, I would say this is feasible.
My question to you fine folks is: Will my idea work? If not, where does this breakdown, and can I add anything to make this work?