Teleconferencing video display system for improving eye contact

• US 5,159,445 A
• Filed: 12/31/1990
• Issued: 10/27/1992
• Est. Priority Date: 12/31/1990
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Original Assignee: AT&T, Inc.
• Inventors: Woodworth, Clark, Gitlin, Richard D., Ribera, John F.
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Burgess, Glenton B.
• Application Number:
  US07/636,324
• Time in Patent Office: 666 Days
• Field of Search: 358/85, 358/213.11, 358/86, 358/185, 358/181, 379/54, 379/53
• US Class Current: 348/14.01
• CPC Class Codes: H04N 7/144 camera and display on the same optical axis, e.g. optically multiplexing the camera and display for eye to eye contact

Abstract

Direct eye-to-eye contact and compactness are achieved in a video display system including a camera positioned behind, or opposite the viewing side of, a display screen having first and second modes of operation. As a result, the camera and the person or persons viewing the display are on opposite sides of the display screen. The display screen is controlled to switch from the first or image display mode to the second or substantially transparent mode. When the display screen is in the substantially transparent mode, the camera is controlled to record images appearing on the viewing side of the screen.

Claims

1. A display system for providing video images to a viewer and for collecting images of the viewer, the system comprising,

display means having first and second controllable modes of operation, the display means having a front and back surfaces, the front surface for viewing the video images,

image sensing means for generating a video representation of the viewer image, the image sensing means being located adjacent to the back surface of the display means,

synchronizing means connected to said display means for controlling the display means to switch to the first controllable mode of operation during a first time interval so that the video image is display by the display means, said synchronizing means for controlling the display means to switch to the second controllable mode of operation during a second time interval so that viewer images are recorded by the image sensing means through the display means,

illumination means positioned adjacent to the back surface of the display means for backlighting the display means, the illumination means being switchably controllable to an "ON" state and to an "OFF" state, and

the synchronizing means connected to the illumination means for controlling the illumination means to switch to the "ON" state during substantially the first time interval, the synchronizing means for controlling the illumination means to switch to the "OFF" state during substantially the second time interval, said second time interval being substantially equal to at least one-fourth of the sum of the first and second time intervals.

2. The display system as defined in claim 1 wherein the display means comprises a substantially flat panel display.

3. The display system as defined in claim 2 wherein the substantially flat panel display is of the type selected from the group consisting of liquid crystal, plasma, and ferro-electric displays.

4. The display system as defined in claim 1 wherein the image sensing means includes a video camera.

5. The display system as defined in claim 1 wherein the image sensing means includes a charge-coupled device array.

6. The display system as defined in claim 1 wherein the display system further includes a frame buffer for storing a next video image the frame buffer responsive to the synchronizing means for transferring the stored next video image to the display means substantially at the beginning of the first time interval.

7. The display system as defined in claim 1 further comprising,

shutter means interposed between the image sensing means and the back surface of the display means and having first and second modes of operation, the first mode of operation for scattering light impinging thereon and the second mode of operation for transmitting light therethrough so that images are transmitted to the image sensing means, and

the synchronizing means connected to the shutter means for controlling the shutter means to switch to the first mode of operation during the first time interval, and the synchronizing means for controlling the shutter means to switch to the second mode of operation during the second time interval.

8. The display system as defined in claim 7 wherein the shutter means includes an electrooptic device.

9. The display system as defined in claim 8 wherein the electrooptic device is a Kerr cell.

10. The display device as defined in claim 7 wherein the shutter means includes a liquid crystal cell.