For such LCDs, is the display RAM usually implemented in the LCD panel
or the camera manufacturer implements that in his camera's circuit board?

These LCDs invariably do NOT have on-board controllers and RAM. You
need to drive it with an external video signal.

wrote:
For such LCDs, is the display RAM usually implemented in the LCD panel
or the camera manufacturer implements that in his camera's circuit board?

These LCDs invariably do NOT have on-board controllers and RAM. You
need to drive it with an external video signal.

If it's less than 9 pins, probably VGA interface.

If it's more than 9 pins, probably 12 or 16 bits Digital + H & V sync,
etc.

First step is to check if the signals are digital or analog.