Electronic device, communication method and recording medium

1. A portable electronic device comprising:

a display part having a display screen and a light source which transmits an optical signal;

a detection part configured to detect a direction of orientation of the display screen of the display part; and

a controller configured to transmit data by the optical signal from the display part to another electronic device when the controller determines that the direction of orientation of the display screen detected by the detection part becomes a predetermined direction; and

a transmission button provided in the display part side for initiating transmission of the optical signal including time data when operated,

wherein the detection part comprises an acceleration sensor capable of detecting an acceleration component of triaxial directions orthogonal to one another, and

wherein the controller includes a first transmission part for transmitting the optical signal when the transmission button is operated and a second transmission part for transmitting the optical signal when it is determined that the direction of the display screen becomes the predetermined direction by an output of the acceleration sensor.

2. A portable electronic device comprising:

a display part having a display screen and a light source which transmits an optical signal;

a detection part configured to detect a direction of orientation of the display screen of the display part; and

a controller configured to transmit data by the optical signal from the display part to another electronic device when the controller determines that the direction of orientation of the display screen detected by the detection part becomes a predetermined direction;

a transmission button provided in the display part side for initiating transmission if the optical signal including time data when operated,

wherein the detection part comprises an illuminance sensor for detecting the illuminance of light incident on the display screen, and

wherein the controller includes a first transmission part for transmitting the optical signal when the transmission button is operated and a second transmission part for determining that the direction of the display screen becomes the predetermined direction and transmitting the optical signal when it is determined that the illuminance detected by the illuminance sensor is a predetermined value or less.

3. A portable electronic device comprising:

a display part having a display screen and a light source which transmits an optical signal;

a detection part configured to detect a direction of orientation of the display screen of the display part; and

a controller configured to transmit data by the optical signal from the display part to another electronic device when the controller determines that the direction of orientation of the display screen detected by the detection part becomes a predetermined direction;

a transmission button provided in the display part side for initiating transmission of the optical signal including time data when operated,

wherein the detection part comprises a thermometer for detecting a temperature in front of the display screen, and

wherein the controller includes a first transmission part for transmitting the optical signal when the transmission button is operated and a second transmission part for determining that the direction of the display screen becomes the predetermined direction and for transmitting the optical signal when it is determined that the temperature detected by the thermometer is in the vicinity of the external body temperature of a user to which the other electronic device is attached.

4. The portable electronic device according to claim 3 , wherein the other electronic device is a wrist-worn electronic device configured to be worn on a user's wrist.

5. The portable electronic device according to claim 3 , wherein the other electronic device is a wristwatch.

6. The portable electronic device according to claim 3 , wherein the other electronic device is a portable electronic device.

7. A portable electronic device that optically communicates with another electronic device, the portable electronic device comprising:

a display part having a display screen and a light source that transmits an optical signal using the display screen;

a detection part configured to detect the direction in which the display screen faces; and

a controller configured to determine when the direction of the display screen detected by the detection part faces a given direction and to thereafter transmit data by the optical signal from the display part to another electronic device, wherein

the display part includes a transmission button,

the detection part comprises an illuminance sensor that detects the illuminance of light incident on the display screen, and

wherein the controller includes a first transmission part for transmitting the optical signal when the transmission button is operated and a second transmission part for determining when the display screen faces the given direction and transmitting the optical signal when it is determined that the illuminance detected by the illuminance sensor is a given value or less.

8. A portable electronic device that optically communicates with another electronic device, the portable electronic device comprising:

a display part having a display screen and a light source that transmits an optical signal using the display screen;

a detection part configured to detect the direction in which the display screen faces; and

a controller configured to determine when the direction of the display screen detected by the detection part faces a given direction and to thereafter transmit data by the optical signal from the display part to another electronic device, wherein

the display part includes a transmission button,

the detection part comprises a thermometer that detects the temperature near the front of the display screen, and

wherein the controller includes a first transmission part for transmitting the optical signal when the transmission button is operated and a second transmission part for determining when the display screen faces the predetermined direction and for transmitting the optical signal when it is determined that the temperature detected by the thermometer is in the vicinity of the external body temperature of a user to which the other electronic device is attached.

9. The portable electronic device according claim 8 , wherein the other electronic device is a wrist-worn electronic device configured to be worn on a user's wrist.

10. The portable electronic device according to claim 8 , wherein the other electronic device is a portable electronic device.

11. The portable electronic device according claim 7 , wherein the other electronic device is a wrist-worn electronic device configured to be worn on a user's wrist.

12. The portable electronic device according to claim 7 , wherein the other electronic device is a portable electronic device.

13. The portable electronic device according to claim 2 , wherein the other electronic device is a wrist-worn electronic device configured to be worn on a user's wrist.

14. The portable electronic device according to claim 2 , wherein the other electronic device is a wristwatch.

15. The portable electronic device according to claim 3 , wherein the other electronic device is a portable electronic device.

16. The portable electronic device according to claim 1 , wherein the other electronic device is a wrist-worn electronic device configured to be worn on a user's wrist.

17. The portable electronic device according to claim 1 , wherein the other electronic device is a wristwatch.

18. The portable electronic device according to claim 1 , wherein the other electronic device is a portable electronic device.