Information processing device and control method

1. An information processing device comprising:

a foldable display with a flexible screen that is configured to fold between a bent form and a flat form;

a memory which temporarily stores display data to be displayed on the display; and

a processor which performs control when displaying the display data stored in the memory on the display,

wherein the processor performs

folding angle detection processing to detect a folding angle of the display with the flexible screen in the bent form, and

luminance correction processing to correct luminance of at least any one of plural areas preset inside a screen area of the flexible screen based on the folding angle detected by the folding angle detection processing and a user's viewpoint position.

2. The information processing device according to claim 1 , wherein

the viewpoint position is preset according to the folding angle of the display, and

the processor selects the viewpoint position from among preset viewpoint positions based on the folding angle detected by the folding angle detection processing.

3. The information processing device according to claim 1 , wherein

the viewpoint position is preset according to the folding angle of the display, and a posture of the information processing device or whether or not the information processing device is handheld by the user,

the processor further performs posture state detection processing to detect the posture of the information processing device or whether or not the information processing device is handheld by the user, and

the processor selects the viewpoint position from among preset viewpoint positions based on the folding angle detected by the folding angle detection processing, and the posture of the information processing device or whether or not the information processing device is handheld by the user detected by the posture state detection processing.

4. The information processing device according to claim 1 , further comprising

a sensor which detects the user's viewpoint position, wherein

the processor further performs viewpoint position detection processing to detect the viewpoint position using the sensor, and

in the luminance correction processing, the processor corrects the luminance of at least any one of the plural areas preset inside the screen area of the flexible screen based on the folding angle detected by the folding angle detection processing and the viewpoint position detected by the viewpoint position detection processing.

5. The information processing device according to claim 4 , wherein

the sensor is an image sensor equipped in a monocular camera, and

in the viewpoint position detection processing, the processor detects an image region with an eye captured therein from a captured image captured by using the image sensor to detect the user's viewpoint position based on position and size of the eye in the captured image.

6. The information processing device according to claim 4 , wherein

the sensor includes plural image sensors equipped in a stereo camera, and

in the viewpoint position detection processing, the processor detects image regions with eyes captured therein respectively from captured images captured by using the plural image sensors to detect the viewpoint position based on position of each eye in each captured image and parallax of the eye.

7. The information processing device according to claim 4 , wherein

the sensor is an infrared sensor equipped in an infrared camera, and

in the viewpoint position detection processing, the processor detects an image region with a pupil captured therein from a captured image captured by using the infrared sensor to detect the user's viewpoint position based on position and size of the pupil in the captured image.

8. The information processing device according to claim 4 , wherein

the sensor includes one or plural image sensors equipped in a monocular camera or a stereo camera, and

in the viewpoint position detection processing, the processor detects an image region(s) with a face captured therein from a captured image(s) captured by using the one or plural image sensors to detect the user's viewpoint position based on position and size of the face in the captured image(s) or parallax of the face.

9. The information processing device according to claim 4 , wherein

the sensor is a distance sensor, and

in the viewpoint position detection processing, the processor detects distance to a person using the distance sensor to detect the viewpoint position based on the detected distance to the person.

10. The information processing device according to claim 1 , wherein

the processor further performs relative angle calculation processing to calculate a relative angle between each of the plural areas preset inside the screen area of the flexible screen and the viewpoint position based on the folding angle detected by the folding angle detection processing and the viewpoint position, and

in the luminance correction processing, the processor corrects the luminance of at least any one of the plural areas based on the relative angle calculated by the relative angle calculation processing.

11. The information processing device according to claim 10 , wherein

the processor generates, in the relative angle calculation processing, relative viewpoint angle data in which information indicative of each of the plural areas inside the screen area of the flexible screen, and information indicative of a relative angle between each of the plural areas and the viewpoint position are associated with each other, and

in the luminance correction processing, the processor refers to the relative viewpoint angle data and luminance correction data in which information indicative of each relative angle and luminance correction value information are pre-associated with each other to correct the luminance of at least any one of the plural areas based on luminance correction value information corresponding to each of the plural areas inside the screen area of the flexible screen.

12. The information processing device according to claim 10 , wherein

the plural areas inside the screen area of the flexible screen are three screen areas of a first screen area corresponding to a folded part in the screen area of the flexible screen when the flexible screen is in the bent form, and a second screen area and a third screen area divided by the first screen area,

the processor calculates, in the relative angle calculation processing, a relative angle between each of the three screen areas and the viewpoint position, and

in the luminance correction processing, the processor corrects luminance for each of the three screen areas based on the relative angle calculated by the relative angle calculation processing.

13. The information processing device according to claim 12 , wherein

in the relative angle calculation processing, the processor calculates relative angles of the second screen area and the third screen area with respect to the viewpoint position for each of plural areas inside each of the screen areas, and

in the luminance correction processing, the processor corrects luminance for each of the plural areas inside each of the screen areas of the second screen area and the third screen area.

14. The information processing device according to claim 1 , wherein

the processor corrects, in the luminance correction processing, luminance to make respective luminance differences among the plural areas of the flexible screen small.

15. The information processing device according to claim 1 , wherein

the processor performs at least the luminance correction processing at regular intervals.

16. A control method for an information processing device including: a foldable display with a flexible screen that is configured to fold between a bent form and a flat form; a memory which temporarily stores display data to be displayed on the display; and a processor which performs control when displaying the display data stored in the memory on the display, the control method comprising:

causing the processor to detect a folding angle of the display with the flexible screen in the bent form; and

causing the processor to correct luminance of at least any one of plural areas preset inside a screen area of the flexible screen based on the detected folding angle and a user's viewpoint position.

17. A computer, comprising:

a foldable display;

a memory which stores display data to be displayed on the display; and

a processor that controls the foldable display, wherein

the foldable display includes

a first display area,

a second display area, and

a third display area disposed between the first display area and the second display area,

the foldable display is foldable at the third display area to adjust a folding angle between the first display area and the second display area, and

the processor is programmed to, when the display data stored in the memory is to be displayed on the display, adjust a luminance of at least the third display area based on the folding angle.