Every notebook has a display. But how is this addressed? Are there any special protocols, etc. For, or does it end up running on HDMI, DVI, etc?
Program> operating system> driver> to the hardware> the logic in the display converts the information into RGB or other signals depending on the display type and switches small areas or pixels on and off. The areas can be backlighting, the pixel LED, LCD, organic things (OLED) etc.
The pixels make up the picture.
These are video outputs, just internal, for example eDP (= embedded display port). With embedded Displayport, you could even connect the laptop's screen to another PC with a little effort. Then there's e.g. LVDS (= low voltage differential signaling), so the above is not possible.
Then there are display drivers and hardware that outputs the image. The hardware (GPU / IGPU) ensures that an image is created in the first place.
