Method and apparatus of private display device

Patent metadata

Field	Value
Publication number	US-9575336-B1
Application number	US-201514876002-A
Country	US
Kind code	B1
Filing date	Oct 6, 2015
Priority date	Oct 6, 2015
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

There is provided a system and method for providing privacy viewing of an output from a electronic display, including a first polarizer configured to polarize a display signal at a first polarization angle; a second polarizer configured to polarize a noise signal at a second polarization angle orthogonal to the first polarization angle; a combiner configured to combine the polarized display signal and the polarized noise signal, and a third polarizer configured to receive the output of the electronic display and polarize the combined polarized display and noise signal at the first polarization angle. The system includes first and second polarization rotators configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display and prior to being received by the third polarizer.

First claim

What is claimed is:

1. A system for providing privacy viewing of an output from a electronic display, the system comprising:
a first polarizer configured to polarize a display signal at a first polarization angle;
a noise generator configured to supply a noise signal;
a second polarizer configured to polarize the noise signal at a second polarization angle orthogonal to the first polarization angle;
a combiner configured to combine the polarized display signal and the polarized noise signal, the combined display and noise signal being configured to be output by the electronic display; and
a third polarizer configured to receive the output of the electronic display and polarize the combined polarized display and noise signal at the first polarization angle.

2. The system according to claim 1 further including a first polarization rotator configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display.

3. The system according to claim 2 wherein the first polarization rotator rotates the first and second polarization angles of the combined polarized display and noise signals according to a rotation pattern.

4. The system according to claim 3 further including a second polarization rotator configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being received by the third polarizer.

5. The system according to claim 4 wherein the second polarization rotator rotates the first and second polarization angles of the combined polarized display and noise signals according to the same rotation pattern as the first polarization rotator.

6. The system according to claim 5 further including respective first and second synchronization modules for providing the same rotation pattern to the first and second polarization rotators.

7. The system according to claim 6 further including respective rotation pattern generators for providing respective predefined or random rotation patterns to the first and second polarization rotators.

8. The system according to claim 7 , wherein the respective rotation pattern generators require a unique user authorization code to generate a corresponding unique predefined rotation pattern.

9. A system for providing privacy viewing of an output from a electronic display, the system comprising:
a display signal scrambler attached to an electronic display, the display signal scrambler comprising a first polarizer configured to polarize a display signal input to the display at a first polarization angle, a noise generator configured to supply a noise signal, a second polarizer configured to polarize the noise signal at a second polarization angle orthogonal to the first polarization angle, and a combiner configured to combine the polarized display signal and the polarized noise signal, the combined display and noise signal being configured to be output by the electronic display; and
a display signal descrambler comprising a third polarizer configured to receive the output of the electronic display and polarize the combined polarized display and noise signal at the first polarization angle.

10. The system according to claim 9 wherein the display signal descrambler is mounted to an eye glass frame.

11. The system according to claim 10 further including respective first and second polarization rotators configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display and prior to being received by the third polarizer, respectively.

12. The system according to claim 11 wherein the first and second polarization rotators rotate the first and second polarization angles of the combined polarized display and noise signals according to the same rotation pattern.

13. The system according to claim 12 further including respective first and second synchronization modules for providing the same rotation pattern to the first and second polarization rotators.

14. The system according to claim 13 further including respective rotation pattern generators for providing respective predefined or random rotation patterns to the first and second polarization rotators.

15. The system according to claim 14 wherein the respective rotation pattern generators require a unique user authorization code to generate a corresponding unique predefined rotation pattern.

16. A method for providing privacy viewing of an output from a electronic display, the method comprising:
polarizing a display signal received by the electronic display at a first polarization angle;
generating a noise signal;
polarizing the noise signal at a second polarization angle orthogonal to the first polarization angle;
combining the polarized display signal and the polarized noise signal;
outputting the combined display and noise signal being from the electronic display; and
receiving the output of the electronic display and polarizing the combined polarized display and noise signal at the first polarization angle.

17. The method according to claim 16 further including rotating the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display and prior to being received by the third polarizer, respectively.

18. The method according to claim 17 further including rotating the first and second polarization angles of the combined polarized display and noise signals according to the same rotation pattern.

19. The method according to claim 18 further including providing respective predefined or random rotation patterns to the first and second polarization rotators.

Assignees

• IBM

Inventors

• Cao Feng
• Tang Jianbin
• Wang Yini
• Wang Ziyuan

Classifications

• G09G2320/068

  for control of viewing angle adjustment · CPC title

• H04N2013/405

  the images being stereoscopic or three dimensional · CPC title

• H04N13/398

  Synchronisation thereof; Control thereof · CPC title

• G09G2358/00

  Arrangements for display data security · CPC title

• G09G2370/18

  Use of optical transmission of display information · CPC title