Multiviewer display system for television monitors

• US 6,188,442 B1
• Filed: 08/01/1997
• Issued: 02/13/2001
• Est. Priority Date: 08/01/1997
• Status: Expired due to Term

• Current Assignee: MediaTek, Inc.
• Original Assignee: International Business Machines Corporation
• Inventors: Narayanaswami, Chandrasekhar
• Primary Examiner(s): Faile, Andrew I.
• Assistant Examiner(s): BUI, KIEU OANH T
• Application Number:
  US08/904,677
• Time in Patent Office: 1,292 Days
• Field of Search: 348/42, 348/52, 348/53, 348/56, 348/39, 348/46-48, 348/345, 348/385, 348/386, 348/387, 348/584, 348/588, 348/564, 345/7, 345/8
• US Class Current: 348/564
• CPC Class Codes: G09G 1/06 using single beam tubes G09G1/26, G09G1/28 take precedence, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows G09G1/28 takes precedence; stereoscopic TV-systems, details thereof H04N13/00; oscilloscopes for three-dimensional representation G01R13/206; vectorscopes G01R13/208
• CPC Class Codes: H04N 13/161 Encoding, multiplexing or demultiplexing different image signal components for multi-view video sequence encoding H04N19/597
• CPC Class Codes: H04N 13/167 Synchronising or controlling image signals
• CPC Class Codes: H04N 13/189 Recording image signals; Reproducing recorded image signals
• CPC Class Codes: H04N 13/341 using temporal multiplexing
• CPC Class Codes: H04N 13/368 for two or more viewers
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 19/597 specially adapted for multi-view video sequence encoding
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/41265 having a remote control device for bidirectional communication between the remote control device and client device unidirectional remote control device H04N21/42204
• CPC Class Codes: H04N 21/4302 Content synchronisation processes, e.g. decoder synchronisation
• CPC Class Codes: H04N 21/431 Generation of visual interfaces for content selection or interaction; Content or additional data rendering
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/44227 Monitoring of local network, e.g. connection or bandwidth variations; Detecting new devices in the local network configuring of peripheral devices in general G06F9/4411; monitoring connectivity in data switched networks H04L43/0811
• CPC Class Codes: H04N 21/4622 Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet web site content organization and management for information retrieval from the Internet G06F16/958; transmission by internet of broadcast information H04H60/82; stock exchange data over packet-switching network H04L12/1804; push services including data channel over packet-switching network H04L12/1859
• CPC Class Codes: H04N 21/482 End-user interface for program selection broadcast systems using EPGs H04H60/72
• CPC Class Codes: H04N 5/44 Receiver circuitry for the reception of television signals according to analogue transmission standards H04N5/14 takes precedence

Abstract

A display monitor (12) operates in a time-multiplexed fashion to display a plurality of viewer-selected video channels on a single display screen. A visual apparatus (22) worn by the viewers is synchronized to the operation of the display monitor for enabling each of the viewers to observe the display screen only at times when the viewer-selected video channel is being displayed.

Claims

1. A method for simultaneously viewing a plurality of video channels, on one display screen, with a plurality of viewers, comprising the steps of:

providing each of the plurality of viewers with visual apparatus that operates in two modes, wherein in a first mode the viewer is enabled to view an image on the display screen through the visual apparatus, while in the second mode the viewer is disabled by the visual apparatus from viewing an image on the display screen;

operating a display monitor that includes the display screen so as to time multiplex the display of a plurality of video channels selected by the plurality of viewers;

synchronizing the operation of each of the plurality of visual apparatus with the display screen such that each viewer is enabled to view the image on the display screen only during a time when a viewer-selected video channel is being displayed on the display screen, and

automatically varying timing of the display of the plurality of channels to accommodate a change in a total number of viewers, or two or more viewers selecting the same video channel.

2. A method as in claim 1, wherein the visual apparatus includes at least one electrically actuated liquid crystal shutter that is transparent in the first mode and opaque in the second mode, and wherein the step of synchronizing includes a step of transmitting synchronization information to the visual apparatus for indicating a time when the at least one liquid crystal shutter is to switch from being transparent to being opaque, and from being opaque to being transparent.

3. A method as in claim 2, wherein the step of transmitting occurs over one of a wireless communications link or a wired communications link.

4. A method as in claim 2, wherein the step of transmitting occurs over a wireless communications link between the display monitor and each of the plurality of visual apparatus.

5. A method as in claim 1, and further comprising the steps of:

receiving, at each of the visual apparatus, an audio channel associated with the same or a different viewer-selected video channel; and

converting the received audio channel into an audio signal for the viewer.

6. A method as in claim 1, wherein at least one of the video channels provides access to a data communications network.

7. A method as in claim 1, wherein at least one of the video channels provides access to the internet.

23. The method of claim 1, wherein said step of varying timing of the display further comprises:

transmitting a plurality of command packets from the display monitor to the visual apparatus, said command packets including data on the number of viewers and an order in which the channels are displayed.

24. The method of claim 1 wherein said step of varying timing is accomplished in response to a viewer using one of said plurality of viewers.

25. The method of claim 1, wherein said step of varying timing is accomplished in response to a viewer actuating a remote control device.

26. The method of claim 1, wherein each video channel is associated with a different program.

27. The method of claim 26, wherein there are more than two programs.

28. The method of claim 1, wherein the step of synchronizing is accomplished only periodically.

8. A system for simultaneously viewing a plurality of video channels, on one display screen, with a plurality of viewers, comprising:

a display monitor that comprises said display screen, said display monitor being coupled to at least one programming source and operating so as to time multiplex the display of a plurality of video channels selected by the plurality of viewers;

for each of the plurality of viewers, a visual apparatus that operates in two modes, wherein in a first mode the viewer is enabled to view an image on the display screen through the visual apparatus, while in the second mode the viewer is disabled by the visual apparatus from viewing an image on the display screen;

said system further comprising a synchronization subsystem for synchronizing the operation of each of said plurality of visual apparatus with the operation of said display monitor such that each viewer is enabled to view the image on said display screen only during a time when a viewer-selected video channel is being displayed on said display screen; and

a subsystem for automatically varying timing of the display of the plurality of channels to accommodate a change in total number of viewers, or two or more viewers selecting the same video channel.

9. A system as in claim 8, wherein said visual apparatus includes at least one electrically actuated liquid crystal shutter that is transparent in the first mode and opaque in the second mode, and wherein said synchronization subsystem comprises a transmitter for transmitting information to each of said plurality of visual apparatus for indicating a time when the at least one liquid crystal shutter is to switch from being transparent to being opaque, and from being opaque to being transparent, and a receiver in each of said visual apparatus for receiving and decoding the transmitted information.

10. A system as in claim 9, wherein said transmitter and said receiver operate over one of a wireless communications link or a wired communications link.

11. A system as in claim 10, wherein said transmitter comprises a portion of said display monitor.

12. A system as in claim 8, wherein each of said visual apparatus comprises a receiver for receiving an audio channel associated with the same or a different viewer-selected video channel and means for converting the received audio channel into an audio acoustic signal for the viewer.

13. A system as in claim 8, wherein at least one of the video channels provides access to a data communications network.

14. A system as in claim 8, wherein at least one of the video channels provides access to the internet.

29. The system of claim 8 wherein said subsystem comprises a transmitter for transmitting a plurality of command packets from the display monitor to said visual apparatus, said command packets including data on the number of viewers and an order in which the channels are displayed.

30. The system of claim 8 wherein said subsystem comprises means for detecting when a viewer is using one of said visual apparatus.

31. The system of claim 30, wherein said means for detecting when a viewer is using one of said visual apparatus comprises a switch in said apparatus, said switch being activated when the apparatus is placed on the head of a viewer.

32. The system of claim 30, wherein said means for detecting when a viewer is using one of said visual apparatus comprises a remote control unit.

33. The system of claim 8, wherein each video channel is associated with a different program.

34. The system of claim 8, wherein there are more than two programs.

35. The system of claim 8, wherein the synchronization subsystem synchronizes only periodically.

15. Visual apparatus worn by a viewer, said visual apparatus comprising a controller coupled to at least one electrically actuated shutter for enabling the viewer to observe a selected one of a plurality of time-multiplexed video channels on a display screen, said visual apparatus operating in two modes, wherein in a first mode the viewer is enabled to observe, with both eyes, an image on the display screen through the at least one shutter, while in the second mode the viewer is disabled by the at least one shutter from observing an image on the display screen, said visual apparatus further comprising a receiver for receiving a synchronization signal for synchronizing the operation of said at least one shutter to the time-multiplexed video channels such that the viewer is enabled to view the viewer-selected video channel on said display screen, wherein said first and second modes occur during a repeating viewing cycle, and wherein a timing of said first and second modes within said viewing cycle can be varied by the synchronization signal to accommodate at least one of a change in a total number of viewers, or two or more viewers selecting the same video channel.

16. A visual apparatus as in claim 15, and further comprising audio circuitry responsive to receiving an audio channel associated with the same or a different viewer-selected video channel for converting the received audio channel into an audio acoustic signal for the viewer.

17. A visual apparatus as in claim 15, wherein said at least one shutter is comprised of a liquid crystal shutter that is transparent in the first mode and opaque in the second mode, and wherein said receiver receives and decodes the synchronization signal for indicating a time when the liquid crystal shutter is to switch from being transparent to being opaque, and from being opaque to being transparent.

18. A visual apparatus as in claim 15, wherein said receiver receives the synchronization signal over one of a wireless communications link or a wired communications link.

19. A display monitor, comprising:

a display screen;

an first interface coupled to at least one programming source for receiving video and audio signals from the at least programming source;

a second interface for receiving signals from a plurality of separately identifiable viewer input devices;

a controller for operating said display screen in a time-multiplexed manner so as to sequentially display a plurality of video channels selected by a plurality of viewers using said viewer input devices, said plurality of video channels being sequentially displayed at a rate such that an individual viewer, when viewing said display screen only during a time that the viewer selected video channel is displayed, sees a continuous image of only the viewer'"'"'s selected video channel; and

a subsystem for automatically varying timing of the display of the plurality of channels to accommodate a change in total number of viewers or two or more viewers selecting the same video channel.

20. A display monitor as in claim 19, and further comprising a transmitter for transmitting a synchronization signal to a plurality of video apparatus individual ones of which are worn by individual ones of said users for synchronizing the operation of each of said plurality of visual apparatus with the operation of said display monitor, such that each viewer is enabled to view the image on said display screen only during a time when a viewer-selected video channel is being displayed on said display screen.

21. A display monitor as in claim 19, wherein said display monitor is responsive to signals received from said second interface for varying a timing of the sequential display of the plurality of video channels so as to accommodate at least one of different numbers of viewers, or two or more viewers selecting a same video channel.

22. A display monitor as in claim 20, and further comprising an audio portion for transmitting, to each of said plurality of visual apparatus, an audio channel associated with the same or a different viewer-selected video channel.

36. The display monitor of claim 19 wherein said subsystem comprises a transmitter for transmitting a plurality of command packets from the display monitor to said visual apparatus, said command packets including data on the number of viewers and an order in which the channels are displayed.

37. The display monitor of claim 19 wherein said subsystem comprises means for detecting when a viewer is using one of said visual apparatus.

38. The display monitor of claim 37, wherein said means for detecting when a viewer is using one of said visual apparatus comprises a switch in said apparatus activated when the apparatus is placed on the head of a viewer.

39. The display monitor of claim 37, wherein said means for detecting when a viewer is using one of said visual apparatus comprises a remote control unit.

40. The display monitor of claim 19, wherein each video channel is associated with a different program.

41. The display monitor of claim 19, wherein there are more than two programs.

42. The display monitor of claim 19, wherein the synchronization subsystem synchronizes only periodically.