Find out the type and model of LCD panel in your iMac, MacBook, MacBook Pro

You can find out what the manufacturer, model number, and type of LCD panel you have in your MacBook or MacBook Pro by executing a command in the Terminal.

Paste the following into a single line in the command line:
ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

You will see something similar to this:
LTN154BT
Color LCD

With the first line being the LCD panel model and the second line being the color profile you are using (same as set in your Display preferences). You can then find out what the manufacturer and specs of the display are by googling for the model number, for instance LTN154BT turns up this page indicating it is a Samsung 15″ display running at 1440×900 and capable of displaying a maximum of 262,000 colors.

This is particularly helpful information to know if your MacBook screen has been cracked and you want to do the installation yourself. Official repairs are often very expensive, but with a little patience and the right tools it can be done by anyone. You can typically pick up an LCD panel through Amazon or eBay for rather cheap and the installation takes about 30 minutes if you follow a guide.