Electronic device for controlling brightness of display

A mobile communication device, comprising:

• a housing including a first section and a second section coupled to each other such that an angle formed between the first section and the second section is adjustable;
• a flexible display at least partially housed in the first section and the second section;
• a first sensor that generates first data used to identify the angle;
• a second sensor that generates second data used to identify illuminance around the mobile communication device;
• and
• a processor operatively connected to the first sensor and the second sensor, and configured to:
• store, in a memory, first information indicating a plurality of angle ranges and second information indicating illuminances corresponding respectively to each of the plurality of angle ranges, the plurality of angle ranges including a first angle range, a second angle range in which a minimum value is greater than a maximum value of the first angle range, and a third angle range in which a minimum value is greater than a maximum value of the second angle range, and the illuminances including a first illuminance corresponding to the first angle range, a second illuminance corresponding to the second angle range and being a value less than the first illuminance, and a third illuminance corresponding to the third angle range and being a value less than the second illuminance,
• identify the angle formed between the first section and the second section based on the first data obtained from the first sensor,
• identify the illuminance based on the second data obtained from the second sensor while at least a part of the flexible display is activated,
• confirm, from the first information stored in the memory, an angle range to which the identified angle belongs,
• confirm, from the second information stored in the memory, illuminance corresponding to the confirmed angle range, wherein the confirmed illuminance is the first illuminance when the identified angle belongs to the first angle range, is the second illuminance when the identified angle belongs to the second angle range, and is the third illuminance when the identified angle belongs to the third angle range,
• determine whether the illuminance, which is identified based on the second data obtained from the second sensor, is greater than the illuminance confirmed from the second information stored in the memory,
• operate the flexible display at a first brightness when the identified illuminance is greater than the illuminance confirmed from the second information, and
• operate the flexible display at a second brightness, which is dimmer than the first brightness, when the identified illuminance is less than or equal to the illuminance confirmed from the second information,
• wherein the processor is configured to operate the flexible display at the second brightness by determining a correction value based on an influence of brightness of the first section on the second section, and determining the second brightness based on the correction value.