We don’t have actual MTBF calculations for our display modules. However, the gating item will always be the LCD panel backlight. For example, the panel used in the 4.3″ modules has a LED lifetime minimum rating of 20,000 hours (typical 30,000 hours). LED lifetime is defined as operating hours at full brightness until the module brightness decreases to 50% of the original intensity when operated at an ambient temperature of 25ºC. This is not as bad as it might seem. Our eyes have a logarithmic response to brightness, so half bright to a luminosity meter is not perceived as half brightness.
Note: The LED lifetime can be increased by reducing the display brightness or by turning the backlight off during periods of inactivity. For example, to double the LED lifetime rating, reduce the backlight brightness to 50%.