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1. WO2006100622 - NEAR VIEWING PROTECTION

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS:

1. A system comprising
- a tag (21) for association with a user (22),
- a display apparatus (4) for displaying an image,
- a receiver (31) for receiving a tag signal (27) from the tag (21) to supply a received signal (RS),
- a detector (32) for receiving the received signal (RS) to supply a detect signal (DS) having an active status when the tag (21) is present in a first area (Al) closer to the display apparatus (4) than a second area (A2), the detect signal (DS) having an inactive status when present in the second area (A2), and
- feedback means (33; 42, 43, 44; 35, 45, 43) for receiving the detect signal

(DS) to provide an user detectable feedback (FB) for indicating to the user that the detect signal (DS) changes to or has the active status.

2. A system as claimed in claim 1, wherein the feedback means (33; 42, 43, 44; 35, 45, 43) is constructed for providing audible or visual feedback to the user (22).

3. A system as claimed in claim 2, wherein the feedback means (33; 42, 43, 44; 35, 45, 46, 43) comprises a transducer (33) for generating the audible or visual feedback in response to the detect signal (DS) having or getting its active status, the transducer (33) being separate from the display apparatus (4).

4. A system as claimed in claim 2, wherein the detector (32) is arranged for supplying the detect signal (DS) to the display apparatus, and wherein the display apparatus (4) comprises the feedback means (42, 43, 44) for providing the visual feedback to the user (22) by changing the image on a display device (43) of the display apparatus (4).

5. A system as claimed in claim 4, wherein the feedback means (42, 43, 44) comprise:
- the display device (43), - a signal generator (44) for supplying a feedback signal (WS),
- a selector (42) for receiving the detect signal (DS) to supply an output signal (DRS) to the display device (43), the output signal (DRS) being an input signal (IS) of the display apparatus (4) if the detect signal (DS) has the inactive status, or the feedback signal (WS) if the detect signal (DS) has the active status.

6. A system as claimed in claim 2, wherein the detector (32) is arranged for supplying the detect signal (DS) to the display apparatus, and wherein the feedback means (35, 45, 43) comprise:
- a signal generator (35) for supplying a feedback signal (WS) to the display apparatus (4), and, in the display apparatus (4),
- a display device (43),
- a selector (45) for receiving the detect signal (DS) and the feedback signal (WS) to supply an output signal (DRS) to the display device (43), the output signal (DRS) being an input signal (IS) of the display apparatus (4) if the detect signal (DS) has an inactive status, or the feedback signal (WS) if the detect signal (DS) has the active status.

7. A system as claimed in claim 5 or 6, wherein the signal generator (44; 35) is constructed for supplying the feedback signal (WS) to obtain a textual or visual warning on the display device (43).

8. A system as claimed in claim 1, wherein the feedback means (33; 42, 43, 44; 35, 45, 43) comprises a switching device (42; 45) for immediately switching off the image in response to the detect signal (DS) getting the active status.

9. A system as claimed in claim 2, wherein the feedback means (33; 42, 43, 44; 35, 45, 43) comprises a switching device (42; 45) for switching off the image a
predetermined period of time in response to the detect signal (DS) getting the active status.

10. A system as claimed in claim 1, wherein the tag (21) comprises an active radio frequency identity tag, and wherein the receiver (31) comprises a transceiver for wireless transmission of a receiver signal (26) to said tag (21) and for wireless reception of the tag signal (27) from said tag (21).

11. A system as claimed in claim 1, wherein the tag (21) is a passive radio frequency identity tag, and wherein the receiver (31) is constructed for wireless reception of the tag signal (27) from said tag (21).

12. A system as claimed in claim 1, wherein the tag (21) has a unique identifier code, and wherein the feedback means (33; 42, 43, 44; 35, 45, 43) is constructed for providing the user detectable feedback (FB) in dependence on said identifier code.

13. A method of changing an image on a display apparatus in response to an indicator indicating a position of a tag with respect to the display apparatus, the method comprises
- receiving (31) a tag signal (27) from the tag (21) to supply a received signal (RS),
- receiving (32) the received signal (RS) to supply a detect signal (DS) having an active status when the tag (21) is present in a first area (Al) closer to the display apparatus

(4) than a second area (A2), the detect signal (DS) having an inactive status when present in the second area (A2), and
- receiving (33; 42, 43, 44; 35, 45, 43) the detect signal (DS) to provide an user detectable feedback (FB) for indicating to the user that the detect signal (DS) changes to or has the active status.

14. A display apparatus comprising
- a detector (32) for receiving the received signal (RS) to supply a detect signal (DS) having an active status when the tag (21) is present in a first area (Al) closer to the display apparatus (4) than a second area (A2), the detect signal (DS) having an inactive status when present in the second area (A2), and
- feedback means (33; 42, 43, 44; 35, 45, 43) for receiving the detect signal (DS) to provide an user detectable feedback (FB) for indicating to the user that the detect signal (DS) changes to or has the active status.

15. A display apparatus as claimed in claim 14, further comprising
- a polarizing mirror (2) being arranged between the user (22) and the display device (43) of the display apparatus (4), the polarizing mirror (2) having a first plane directed to the user (22) for reflecting light of a first polarization direction, the polarizing mirror (2) being transmissive for light having a second polarization direction different than the first polarization direction, the display device (43) being constructed for emitting light having the second polarization direction, and
- a switchable optical element (12) in-between the display device (43) and the polarizing mirror (2) for selectively rotating a polarization direction of light passing said optical element (12) over at least two predetermined different angles dependent on a status of the said optical element (12).

16. Use of a tag in a system as claimed in claim 1.