Methods and apparatus to detect an operating state of a display

• US 20060212895A1
• Filed: 03/24/2006
• Published: 09/21/2006
• Est. Priority Date: 09/25/2003
• Status: Active Grant

• Current Assignee: Nielsen Company (US), LLC
• Original Assignee: Nielsen Company (US), LLC
• Inventors: Johnson, Karin A.
• Granted Patent: US 9,027,043 B2
• Time in Patent Office: Days
• US Class Current: 725/12
• CPC Class Codes: H04H 60/32 Arrangements for monitoring conditions of receiving stations, e.g. malfunction or breakdown of receiving stations
• CPC Class Codes: H04N 21/422 Input-only peripherals , i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] input devices also receiving signals from specially adapted client devices H04N21/4104
• CPC Class Codes: H04N 21/44224 Monitoring of user activity on external systems, e.g. Internet browsing
• CPC Class Codes: H04N 21/6581 Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application

Abstract

Methods and apparatus to detect an operating state of a display are disclosed. An example device to detect an operating state of a display includes an optical fiber, an optical-to-electrical converter, and a logic circuit. The optical fiber is optically coupled to a light source of the display. The light energy source is configured to emit light. The optical-to-electrical converter is coupled to the light source via the optical fiber and configured to convert light from the light source into an electrical signal. The logic circuit is coupled to the optical-to-electrical converter and configured to generate an output signal indicative of the operating state of the display based on the electrical signal.

Claims

1. A device to detect an operating state of a display, the device comprising:

an optical fiber optically coupled to a light source of the display, the light source being configured to emit light;

an optical-to-electrical converter coupled to the light source via the optical fiber, the optical-to-electrical converter being configured to convert light from the light source into an electrical signal; and

a logic circuit coupled to the optical-to-electrical converter, the logic circuit being configured to generate an output signal indicative of the operating state of the display based on the electrical signal.

2. The device as defined in claim 1, wherein the optical fiber comprises at least one of a plastic optical fiber and a glass optical fiber.

3. The device as defined in claim 1, the display is one of a liquid crystal display (LCD), and a plasma display.

4. The device as defined in claim 1, wherein the optical-to-electrical converter comprises at least one of a photodetector, a photodiode, and a light-sensitive semiconductor junction device.

5. The device as defined in claim 1, wherein the operating state of the display comprises at least one of an on state and an off state.

6. The device as defined in claim 1, wherein the output signal comprises at least one of a high signal and a low signal.

7. The device as defined in claim 1 further comprising a signal processing circuit coupled to the optical-to-electrical converter and the processor, the signal processing circuit configured to amplify and to filter the electrical signal.

8. The device as defined in claim 1 further comprising a processor coupled to the logic circuit, the processor being configured to associate a time stamp with the output signal from the logic circuit and to provide operating information associated with the display to a data collection facility.

9. The device as defined in claim 1 is integrated into a set top box (STB).

10. A system to detect an operating state of a display comprising:

a display having a light source configured to emit light; and

a display monitoring device optically coupled to a light source of the display via an optical fiber, the display monitoring device being configured to convert light from the light source into an electrical signal indicative of the operating state of the display.

11. A system as defined in claim 10, wherein the operating state of the display comprises at least one of an on state and an off state.

12. A system as defined in claim 10, wherein the optical fiber comprises at least one of a plastic optical fiber and a glass optical fiber.

13. A system as defined in claim 10, wherein the display is one of a liquid crystal display (LCD), a plasma display, and a cathode ray tube (CRT) display.

14. A system as defined in claim 10, wherein the display monitoring device comprises an optical-to-electrical converter optically coupled to the light source via the optical fiber, the optical-to-electrical converter being configured to convert light from the light source into an electrical signal.

15. A system as defined in claim 14, wherein the display monitoring device comprises a logic circuit coupled to the optical-to-electrical converter, the logic circuit being configured to generate an output signal indicative of the operating state of the display based on the electrical signal.

16. A system as defined in claim 15, wherein the output signal comprises at least one of a high signal and a low signal.

17. A system as defined in claim 15 further comprising a processor coupled to the logic circuit, the processor being configured to associate a time stamp with the output signal from the logic circuit and to provide operating information associated with the display to a data collection facility.

18. A system as defined in claim 14, wherein the display monitoring device comprises a signal processing circuit coupled to the optical-to-electrical converter and the processor, the signal processing circuit configured to amplify and to filter the electrical signal.

19. A system as defined in claim 10, wherein the display monitoring device is integrated into a set top box (STB).

20. A method to detect an operating state of a display comprising:

optically coupling an optical fiber to a light source associated with the display, the light source being configured to emit light;

converting light from the light source to an electrical signal; and

generating an output signal indicative of the operating state of the display based on the electrical signal.

21. A method as defined in claim 20, wherein optically coupling the optical fiber to the light source associated with the display comprises optically coupling one of a plastic optical fiber and a glass optical fiber to the light source associated with the display.

22. A method as defined in claim 20, wherein the display is one of a liquid crystal display (LCD), and plasma display.

23. A method as defined in claim 20, wherein generating the output signal indicative of the operating state of the display comprises amplifying and filtering the electrical signal.

24. A method as defined in claim 20, wherein the output signal is indicative of at least one of an on state and an off state of the display.

25. A method as defined in claim 20 further comprising associating a time stamp with the output signal.

26. A method as defined in claim 20 further comprising providing operating information associated with the display to a data collection facility.