Electronic device and method for adjusting luminance of display on basis of angle formed with earbud, and non-transitory computer-readable storage medium

An electronic device comprising:

• at least one memory storing instructions;
• at least one sensor;
• a display;
• a communication circuitry;
• and
• at least one processor operatively connected to the at least one memory, the at least one sensor, the display, and the communication circuitry,
• wherein the at least one processor is configured to execute the instructions to:
• when identifying whether at least one earbud is worn based on a preset signal received from the at least one earbud connected to the electronic device, receive a touch input contacted on the display;
• based on first data obtained through the at least one sensor when the touch input is received, identify that a variance of a posture of the electronic device is lower than a threshold value;
• based on identifying that the variance of the posture of the electronic device is lower than the threshold value when the touch input is received, transmit, to the at least one earbud through the communication circuitry, a signal to request second data about a posture of the at least one earbud;
• receive, from the at least one earbud through the communication circuitry, the second data;
• obtain a reference angle indicating a difference of the posture of the electronic device and the posture of the at least one earbud, based on a difference of the first data about the posture of the electronic device and the second data about the posture of the at least one earbud when the touch input is received;
• after obtaining the reference angle, identify a difference between third data about the posture of the electronic device, the third data being obtained through the at least one sensor, and fourth data about the posture of the at least one earbud received from the at least one earbud through the communication circuitry;
• based on identifying that the difference between the third data and the fourth data is within a preset range from the reference angle, display a screen, through the display, with a first brightness;
• and
• based on identifying that the difference between the third data and the fourth data is outside of the preset range, display the screen with a second brightness different from the first brightness.