Device for controlling multiple areas of display independently and method thereof

A method performed in an electronic device including a display comprising a first display area and a second display area, the first display area being larger than the second display area, an application processor and a display driver integrated circuit (DDI), the DDI consuming less power than the application processor, the method comprising:

• generating a first display screen;
• detecting an operation for displaying a home screen user interface (UI), for displaying an application UI, or for displaying a side call UI, which is performed in the electronic device, by the application processor;
• transferring the first display screen to the DDI in response to the detected operation for displaying the home screen UI, for displaying the application UI, or for displaying the side call UI, by the application processor;
• determining a range of display control authority to be provided to the DDI by the application processor according to the detected operation for displaying the home screen UI, for displaying the application UI, or for displaying the side call UI, the range of the display control authority defining the second display area, the second display area including at least a part of at least one curved area of the display, the application processor determining the range of display control authority based on a determination whether the electronic device is operating in a horizontal orientation (landscape mode) or in a vertical orientation (portrait mode);
• generating a second display screen by the DDI in correspondence with the range of the display control authority based on the first display screen;
• displaying the first display screen on the first display area, by the DDI;
• and
• displaying the second display screen on the second display area,
• wherein the DDI generates the second display screen using different display effects based on a type of content which is displayed in the first display screen.