The new official Raspberry PI touchscreen 7 inch display is now available and connects directly to a Raspberry PI board using a flat ribbon cable and power wires that are supplied with the display.
The screen operates from a 5V supply and can be powered from the Raspberry PI header pins using the supplied wires. The screen can also be powered from its own external 5V power supply and has a micro USB connector identical to the one used to supply power to Raspberry PI boards. If a separate power supply is used to power the screen, it must be rated at 500mA or more.
Mounting a Raspberry PI Board on the Touchscreen
Terminal posts are provided at the back of the touchscreen that hold the touchscreen circuit board in place. A raspberry PI board can be mounted on the back of the touchscreen by attaching it with the four screws that are supplied with the screen to the terminal posts.
The image below shows a Raspberry PI 2 model B attached to the back of a Raspberry PI touchscreen.
Connecting a Raspberry PI to the Raspberry PI Touchscreen
It is important to make the connections between the Raspberry PI board and touchscreen correctly, especially the power to the screen when it is tapped from the header of the Raspberry PI board.
A flat ribbon cable is supplied with the screen for making a data connection between the raspberry PI board and screen. Jumper wires are supplied with the board for connecting 5V and GND from the Raspberry PI header pins to the touchscreen to supply power to the screen.
Full connection details including photos and a video can be found in the article on how to connect the official 7″ LCD Raspberry PI touchscreen to a Raspberry PI board.