Final answer:
CRT (Cathode Ray Tube) displays may be practical for laptops format but have limited uses due to heat considerations. LCD, LED, and plasma displays are more commonly used in laptops.
Step-by-step explanation:
The display type that may be practical for a laptop format but has limited uses due to heat considerations is CRT (Cathode Ray Tube). CRT displays have a bulky design and generate a significant amount of heat while in operation. This makes them less suitable for compact and portable devices like laptops.
On the other hand, LCD (Liquid Crystal Display), LED (Light-Emitting Diode), and plasma displays are more commonly used in laptops due to their slim design and lower heat production.