Display limit values:
the lifetime

In order to fully understand the limit value "lifetime", it is worthwhile to consider the temperature ranges of a display first, as it can have a significant influence. In display specifications, manufacturers usually mention 2 parameters:

-the storage temperature 

-the operating temperature

The storage temperature

The storage temperature is a range (between a min. and a max. temperature in C°) at which a display can be stored or exposed to a certain temperature in a non-operating state for a certain time. The storage temperature itself is usually higher than the operating temperature. If the display is stored within the specified storage temperature, the display will function properly at operation temperature and meet all specified parameters.

The operating temperature

The operating temperature defines the range (between a min. and a max. temperarunge range in °C)  at which a display can be operated at temperature X for a specified time when switched on. When operated at the correct operating temperature, the display will meet all specified parameters. The specified parameters (such as the lifetime) are therefore temperature-dependent.

The liftetime

The component of a display with the shortest lifetime (usually the backlight or panel), determines the achievable lifetime of a display. When the lifetime is reached, either the brightness or the contrast is at least 50% of the originally specified value. The display can still be operated beyond this. The lifetime depends on the environmental conditions. The specification usually refers to +25°C / 60% RH.

Rule of thumb:  the lifetime is halved for every +10° (Law of Arrhenius)

Conclusion

• A display is not "dead" after reaching its lifetime! It can continue to operate with 50% of the originally specified value of brightness or contrast.
• The lifetime depends on the environmental conditions; the specification usually refers to +25°C / 60% RH.
• Arrhenius rule of thumb: per +10°, the lifetime is halved.