DISPLAY DEVICE, RECEPTION DEVICE, AND METHOD OF CONTROLLING RECEPTION DEVICE

• US 20180088339A1
• Filed: 09/20/2017
• Published: 03/29/2018
• Est. Priority Date: 09/29/2016
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: ARUGA, Naoto
• Granted Patent: US 10,627,626 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 1/68 Marker, boundary, call-sign, or like beacons transmitting signals not carrying directional information
• CPC Class Codes: G01S 19/48 by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system
• CPC Class Codes: G01S 19/53 Determining attitude
• CPC Class Codes: G02B 2027/0138 comprising image capture systems, e.g. camera
• CPC Class Codes: G02B 2027/014 comprising information/image processing systems
• CPC Class Codes: G02B 2027/0141 characterised by the informative content of the display
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G09G 2370/025 LAN communication management
• CPC Class Codes: G09G 2370/16 Use of wireless transmission of display information
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

An HMD includes a beacon reception unit that receives a beacon signal and a control unit that controls a reception period of the beacon reception unit and intermittently receives a beacon signal. The control unit selects the beacon signal based on a reception strength of the beacon signal received by the beacon reception unit and changes a reception period of the beacon signal reception unit in accordance with a transmission timing of the selected beacon signal.

Claims

1. A display device that is a transmissive display device worn on ahead of a user and transmits an outside scenery so that the user views the outside scenery, the display device comprising:

a reception unit that receives beacon signals; and

a control unit that controls a reception period of the reception unit and intermittently receives the beacon signal,

wherein the control unit changes the reception period of the reception unit to correspond to a reception state of the beacon signal received by the reception unit.

2. The display device according to claim 1,

wherein the control unit selects the beacon signal based on a reception strength of the beacon signal received by the reception unit and changes the reception period of the reception unit in accordance with a transmission timing of the selected beacon signal.

3. The display device according to claim 1,

wherein the control unit changes the reception period of the reception unit based on information included in the beacon signal received by the reception unit or information indicated by the beacon signal.

4. A reception device comprising:

a reception unit that receives beacon signals; and

a control unit that controls a reception period of the reception unit and intermittently receives the beacon signal,

wherein the control unit changes the reception period of the reception unit to correspond to a reception state of the beacon signal received by the reception unit.

5. The reception device according to claim 4,

wherein the control unit selects the beacon signal based on a reception strength of the beacon signal received by the reception unit and changes the reception period of the reception unit in accordance with a transmission timing of the selected beacon signal.

6. The reception device according to claim 5,

wherein the control unit shifts the reception period of the reception unit in accordance with the transmission timing of the selected beacon signal.

7. The reception device according to claim 5,

wherein the control unit sets a first duration in which the reception unit is caused to perform an operation of receiving the beacon signal and a second duration in which the reception unit is caused not to perform the operation of receiving the beacon signal, and

wherein the control unit changes a duty ratio between the first and second durations at the reception period in accordance with the transmission timing of the selected beacon signal.

8. The reception device according to claim 5,

wherein the control unit sets a first duration in which the reception unit is caused to perform an operation of receiving the beacon signal and a second duration in which the reception unit is caused not to perform the operation of receiving the beacon signal, and

wherein the control unit changes a length of the first duration in accordance with the transmission timing of the selected beacon signal.

9. The reception device according to claim 5,

wherein when the reception unit receives the plurality of beacon signals, the control unit selects a preset number of beacon signals based on the reception strengths of the plurality of received beacon signals and changes the reception period of the reception unit in accordance with the transmission timing of the selected beacon signal.

10. The reception device according to claim 9,

wherein the control unit acquires information regarding transmission sources of the beacon signals from the plurality of beacon signals and selects a preset number of beacon signals based on the reception strengths of the plurality of received beacon signals and the information regarding the transmission sources of the plurality of beacon signals.

11. The reception device according to claim 9,

wherein when the selected beacon signals include the beacon signal unreceivable at the changed reception period, the control unit selects the beacon signal to be excluded from the selected beacon signals based on the reception strengths and resets the reception period in accordance with the transmission timings of the beacon signals from which the selected beacon signal to be excluded is excluded.

12. The reception device according to claim 4,

wherein the control unit estimates a position of the reception device based on the reception strength of the beacon signal received by the reception unit.

13. The reception device according to claim 12, further comprising:

a storage unit that stores positional information indicating a position of a beacon device transmitting the beacon signal in association with identification information of the beacon device,

wherein the control unit acquires the identification information from each of the plurality of beacon signals received by the reception unit and estimates the position of the reception device based on the reception strengths of the plurality of beacon signals and the pieces of positional information regarding the beacon devices, which are the transmission sources of the plurality of beacon signals, which are acquired from the storage unit.

14. The reception device according to claim 12,

wherein the control unit selects the beacon signals by comparing the reception strengths of the plurality of received beacon signals to a threshold, estimates the position of the reception device through 3-point positioning when the number of selected beacon signals is 3, estimates the position of the reception device through 4-point positioning when the number of selected beacon signals is 4 or more, and resets the reception period when the number of selected beacon signals is less than 3.

15. The reception device according to claim 12, further comprising:

at least one of an acceleration sensor, a gyro sensor, and a magnetic sensor,

wherein the control unit corrects the estimated position of the reception device based on a sensor value detected by at least the one of the acceleration sensor, the gyro sensor, and the magnetic sensor.

16. The reception device according to claim 4,

wherein the control unit changes the reception period of the reception unit based on information included in the beacon signal received by the reception unit or information indicated by the beacon signal.

17. The reception device according to claim 16,

wherein when a first duration in which the reception unit is caused to perform an operation of receiving the beacon signal and a second duration in which the reception unit is caused not to perform the operation of receiving the beacon signal are set, the control unit changes a duty ratio between the first and second durations, a length of the first duration, or the reception period of the reception unit.

18. The reception device according to claim 17,

wherein based on information included in the beacon signal received by the reception unit or information indicated by the beacon signal, the control unit changes the duty ratio between the first and second durations, the length of the first duration, or the reception period of the reception unit so that beacon signals other than the beacon signals received by the reception unit are received.

19. A method of controlling a reception device that controls a reception period of a reception unit receiving a beacon signal and intermittently receives the beacon signal, the method comprising:

changing the reception period of the reception unit to correspond to a reception state of the beacon signal received by the reception unit.

20. The method of controlling the reception device according to claim 19, the method further comprising:

detecting a reception strength as the reception state of the beacon signal received by the reception unit;

selecting the beacon signal based on the detected reception strength; and

changing the reception period of the reception unit in accordance with a transmission timing of the selected beacon signal.