hi sir,
I have already built a similar device for one of our clients for a desktop display updatable by wifi.
They update the image over internet wifi by server update script.
I can also provide your the server script which will be able to upload the image to the screen.
Question: what will be the use of the touch screen? Will you be powering the device using a powerbank?
We can use a 3.5inch TFT screen for your purpose.
Prototype charge extra if it will be more than 50USD, please message me so that I can send image of our wifi prototype
We can work towards faster prototype if you can clarify questions faster.
Thank you!