Display apparatus and display method

A display method of a display apparatus comprising a display panel, the display method comprising:

• by at least one processor of the display apparatus:
• sensing an illuminance around the display panel;
• based on a illuminance around the display panel being sensed, determining a luminance of a test image for distinguishing a luminance corresponding to a specific region of the display panel from a luminance corresponding to another region of the display panel so that a higher sensed luminance respectively results in a higher determined luminance;
• displaying the test image with the determined luminance on the display panel;
• receiving, from an external apparatus, correction data that is identified based on a photograph being captured by the external apparatus from the display panel which is the displayed test image;
• correcting a gray scale value of an image data corresponding to the specific region of the display panel on based on the received correction data;
• and
• displaying the image data of which the gray scale value is corrected on the specific region of the display panel,
• wherein the test image is a single color image including a plurality of markers.

A display apparatus comprising:

• a display panel;
• a sensor;
• and
• at least one processor configured to:
• based on a illuminance around the display panel being sensed by the sensor, determine a luminance of a test image that is proportional to the sensed illuminance for distinguishing a luminance corresponding to a specific region of the display panel from a luminance corresponding to another region of the display panel,
• control the display panel to display the test image with the determined luminance,
• receive, from an external apparatus, correction data that is identified based on a photograph being captured by the external apparatus from the display panel which is the displayed test image,
• correct a gray scale value of an image data corresponding to the specific region of the display panel based on the received correction data, and
• control the display panel to display the image data of which the gray scale value is corrected on the specific region of the display panel.