Almost all displays today are designed using LCD technology. An LCD display monitor consists of 2 glass plates and a liquid in between. TFT displays are also LCD displays - monitors, only extended by a color filter and an active control via transistor. There are many different versions: text, graphics, 7-segment and icon-based versions. The 7-segment display was an early form of LCD displays and was installed in calculators and watches. 
Text displays helped the service technicians as well as the users to check the status of devices and to make entries. 
With a graphic display you are extremely flexible, since texts with a wide variety of fonts as well as graphics, logos and icons can be displayed. 

Graphic displays are extremely flexible, as they can display texts with a wide variety of fonts as well as graphics, logos and icons. Buy in the webshop.