Method, electronic device, and computer program product for adjusting field of view of screen

1 . A method comprising:

detecting a target object within a detection range by using a radar apparatus of an electronic device, the electronic device having a screen with a variable field of view that is controllably adjustable to provide a plurality of different visual angles measured relative to a line perpendicular to a plane of a viewing surface of the screen, each of the different visual angles corresponding to a different field of view of the screen;

determining whether the target object is a person by using a biometric signal in a detection signal emitted by the radar apparatus in response to detecting the target object;

determining a distance and an angle of the target object relative to the electronic device by using an azimuth signal in the detection signal in response to the target object being a person; and

adjusting the field of view of the screen of the electronic device according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds, where the visual mode indicates a particular one of the different visual angles of the screen of the electronic device, the electronic device having a plurality of visual modes including at least first, second and third different visual modes corresponding to respective first, second and third visual angles providing respective first, second and third different fields of view of the screen.

2 . The method according to claim 1 , wherein the visual mode comprises one or more modes of a plurality of modes, the plurality of modes comprising:

a sharing mode indicating that the visual angle is within a range of a first angle centered at a midpoint of the screen;

a relaxation mode indicating that the visual angle is within a range of a second angle centered at the midpoint of the screen, the second angle being smaller than the first angle; and

a protection mode indicating that the visual angle is within a range of a third angle centered at the midpoint of the screen, the third angle being smaller than the second angle.

3 . The method according to claim 2 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

determining that the visual mode is the sharing mode, the distance is smaller than the distance threshold, and the angle is smaller than the first angle; and

adjusting the field of view of the screen to be smaller than the angle, so that content of the screen is invisible to the target object.

4 . The method according to claim 2 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

determining that the visual mode is the relaxation mode, the distance is smaller than the distance threshold, and the angle is smaller than the second angle; and

adjusting the field of view of the screen to be smaller than the angle, so that content of the screen is invisible to the target object.

5 . The method according to claim 2 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

determining that the visual mode is the protection mode, the distance is smaller than the distance threshold, and the angle is smaller than the third angle; and

adjusting the field of view of the screen to be smaller than the angle, so that content of the screen is invisible to the target object.

6 . The method according to claim 2 , further comprising:

in response to the angle being smaller than the first angle and the visual mode being the sharing mode, issuing an alarm indicating that the screen is susceptible to unauthorized viewing;

in response to the angle being smaller than the second angle and the visual mode being the relaxation mode, issuing an alarm indicating that the screen is susceptible to unauthorized viewing; or

in response to the angle being smaller than the third angle and the visual mode being the protection mode, issuing an alarm indicating that the screen is susceptible to unauthorized viewing.

7 . The method according to claim 2 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

adjusting the field of view of the screen according to the visual mode based on the distance, a plurality of distance thresholds, the angle, and the plurality of angle thresholds.

8 . The method according to claim 7 , wherein the plurality of distance thresholds comprise:

a first distance associated with the sharing mode;

a second distance associated with the relaxation mode, the second distance being greater than the first distance; and

a third distance associated with the protection mode, the third distance being greater than the second distance.

9 . The method according to claim 2 , wherein the visual mode is set to the sharing mode by default.

10 . The method according to claim 1 , wherein the screen comprises a liquid crystal display (LCD) with a variable field of view.

11 . An electronic device, comprising:

at least one processor; and

memory coupled to the at least one processor and having instructions stored therein, wherein the instructions, when executed by the at least one processor, cause the electronic device to perform actions comprising:

detecting a target object within a detection range by using a radar apparatus of the electronic device, the electronic device having a screen with a variable field of view that is controllably adjustable to provide a plurality of different visual angles measured relative to a line perpendicular to a plane of a viewing surface of the screen, each of the different visual angles corresponding to a different field of view of the screen;

determining whether the target object is a person by using a biometric signal in a detection signal emitted by the radar apparatus in response to detecting the target object;

determining a distance and an angle of the target object relative to the electronic device by using an azimuth signal in the detection signal in response to the target object being a person; and

adjusting the field of view of the screen of the electronic device according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds, where the visual mode indicates a particular one of the different visual angles of the screen of the electronic device, the electronic device having a plurality of visual modes including at least first, second and third different visual modes corresponding to respective first, second and third visual angles providing respective first, second and third different fields of view of the screen.

12 . The electronic device according to claim 11 , wherein the visual mode comprises one or more modes of a plurality of modes, the plurality of modes comprising:

a sharing mode indicating that the visual angle is within a range of a first angle centered at a midpoint of the screen;

a relaxation mode indicating that the visual angle is within a range of a second angle centered at the midpoint of the screen, the second angle being smaller than the first angle; and

a protection mode indicating that the visual angle is within a range of a third angle centered at the midpoint of the screen, the third angle being smaller than the second angle.

13 . The electronic device according to claim 12 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

determining that the visual mode is the sharing mode, the distance is smaller than the distance threshold, and the angle is smaller than the first angle; and

adjusting the field of view of the screen to be smaller than the angle, so that content of the screen is invisible to the target object.

14 . The electronic device according to claim 12 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

determining that the visual mode is the relaxation mode, the distance is smaller than the distance threshold, and the angle is smaller than the second angle; and

adjusting the field of view of the screen to be smaller than the angle, so that content of the screen is invisible to the target object.

15 . The electronic device according to claim 12 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

determining that the visual mode is the protection mode, the distance is smaller than the distance threshold, and the angle is smaller than the third angle; and

adjusting the field of view of the screen to be smaller than the angle, so that content of the screen is invisible to the target object.

16 . The electronic device according to claim 12 , wherein the actions further comprise:

in response to the angle being smaller than the first angle and the visual mode being the sharing mode, issuing an alarm indicating that the screen is susceptible to unauthorized viewing;

in response to the angle being smaller than the second angle and the visual mode being the relaxation mode, issuing an alarm indicating that the screen is susceptible to unauthorized viewing; or

in response to the angle being smaller than the third angle and the visual mode being the protection mode, issuing an alarm indicating that the screen is susceptible to unauthorized viewing.

17 . The electronic device according to claim 12 , wherein adjusting the field of view of the screen according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds comprises:

adjusting the field of view of the screen according to the visual mode based on the distance, a plurality of distance thresholds, the angle, and the plurality of angle thresholds.

18 . The electronic device according to claim 17 , wherein the plurality of distance thresholds comprise:

a first distance associated with the sharing mode;

a second distance associated with the relaxation mode, the second distance being greater than the first distance; and

a third distance associated with the protection mode, the third distance being greater than the second distance.

19 . The electronic device according to claim 12 , wherein:

the visual mode is set to the sharing mode by default; and

the screen comprises a liquid crystal display (LCD) with a variable field of view.

20 . A computer program product comprising a non-transitory computer-readable medium having machine-executable instructions stored therein, wherein the machine-executable instructions, when executed by a machine, cause the machine to perform actions comprising:

detecting a target object within a detection range by using a radar apparatus of an electronic device, the electronic device having a screen with a variable field of view that is controllably adjustable to provide a plurality of different visual angles measured relative to a line perpendicular to a plane of a viewing surface of the screen, each of the different visual angles corresponding to a different field of view of the screen;

determining whether the target object is a person by using a biometric signal in a detection signal emitted by the radar apparatus in response to detecting the target object;

determining a distance and an angle of the target object relative to the electronic device by using an azimuth signal in the detection signal in response to the target object being a person; and

adjusting the field of view of the screen of the electronic device according to a visual mode of the electronic device based on the distance, a distance threshold, the angle, and a plurality of angle thresholds, where the visual mode indicates a particular one of the different visual angles of the screen of the electronic device, the electronic device having a plurality of visual modes including at least first, second and third different visual modes corresponding to respective first, second and third visual angles providing respective first, second and third different fields of view of the screen.