Electronic apparatus

1. An electronic apparatus comprising:

a luminance adjustable display module;

an illuminance sensor configured to detect illuminance around the electronic apparatus; and

a controller configured to:

read the illuminance from the illuminance sensor;

determine luminance corresponding to the illuminance;

control the luminance adjustable display module to set luminance to the determined luminance; and

set a waiting time based on the determined luminance, the waiting time being a time to a next time point of illuminance reading and luminance control, wherein the controller is configured to set the waiting time to a shorter period of time when the determined luminance is at a high level and to set the waiting time to a longer period of time which is greater than the shorter period of time when the determined luminance is at a low level which is less than the high level.

2. The electronic apparatus of claim 1 , further comprising table configured to store waiting times wherein the waiting times are set so as to be shorter as the luminance becomes higher and longer as the luminance becomes lower,

wherein the controller is configured to read a waiting time corresponding to the determined luminance from the table and to set the read waiting time as the waiting time to the next time point of illuminance reading and luminance control.

3. The electronic apparatus of claim 1 , wherein the luminance adjustable display module is adjusted by controlling luminance of a backlight of the luminance adjustable display module.