Image projecting apparatus

• US 5,879,065 A
• Filed: 06/25/1997
• Issued: 03/09/1999
• Est. Priority Date: 07/10/1996
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Shirochi, Yoshiki, Kamaya, Naoki
• Primary Examiner(s): DOWLING, WILLIAM C
• Application Number:
  US08/882,265
• Time in Patent Office: 622 Days
• Field of Search: 353/8, 353/7, 353/20, 353/31, 353/33, 353/34, 353/37, 349/9, 359/464, 359/465, 348/52, 348/58, 348/60, 348/43, 348/44, 348/57
• US Class Current: 353/8
• CPC Class Codes: H04N 13/324 Colour aspects
• CPC Class Codes: H04N 13/337 using polarisation multiplexing
• CPC Class Codes: H04N 13/341 using temporal multiplexing
• CPC Class Codes: H04N 13/361 Reproducing mixed stereoscopic images; Reproducing mixed monoscopic and stereoscopic images, e.g. a stereoscopic image overlay window on a monoscopic image background
• CPC Class Codes: H04N 13/363 using image projection screens volumetric display H04N13/388
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10
• CPC Class Codes: H04N 9/312 Driving therefor driving of electronic spatial light modulators in displays other than projection devices G09G3/34, G09G3/36; control of liquid crystal elements G02F1/133; control of micromechanical modulators G02B26/08
• CPC Class Codes: H04N 9/3155 for controlling the light source light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406
• CPC Class Codes: H04N 9/3179 Video signal processing therefor

Abstract

An image projecting apparatus is so constructed as to generate a stereoscopic-image signal having images for right and left eyes alternatively arranged for each field, decompose an image produced by the stereoscopic-image signal into lights with predetermined components, divide the lights into first and second groups, assign the first group to a first polarized light having the directions of polarization different from each other for each period of a video field, assign the second group to a second polarized light having the directions of polarization different from each other for each period of a video field and having a direction of polarization different from that of the first polarized light, and project the first and second polarized lights, the second polarized light being delayed by one video field with respect to the first polarized light.

Claims

1. An image projecting apparatus, comprising:

means for generating a stereoscopic-image signal having images for right and left eyes alternatively arranged for each video field of said image signal;

means responsive to said generating means for decomposing an image produced by said stereoscopic-image signal into lights with predetermined components;

means responsive to said decomposing means for dividing said lights into first and second groups;

means responsive to said dividing means for assigning said first group to a first polarized light having directions of polarization different from each other for each period of said field;

means responsive to said assigning means for assigning said second group to a second polarized light having said directions of polarization different from each other for each period of said field and having a direction of polarization different from that of said first polarized light; and

means responsive to said two assigning means for projecting said first and second polarized lights, said second polarized light being delayed by one video field with respect to said first polarized light.

2. An image projecting apparatus as claimed in claim 1, wherein said lights include red, green, and blue lights.

3. An image projecting apparatus as claimed in claim 1, wherein said first group includes red and blue lights, and said second group includes a green light.

4. An image projecting apparatus as claimed in claim 1, wherein said first and second polarized lights include linear polarized lights perpendicular to each other.

5. An image projecting apparatus as claimed in claim 1, wherein said first and second polarized lights include circular polarized lights having directions of rotation opposite to each other.

6. An image projecting apparatus as claimed in claim 2, wherein said lights further include a brightness light.

7. An image projecting apparatus as claimed in claim 1, wherein said first group includes red, green, and blue lights, and said second group includes a brightness light.

8. An image projecting apparatus as claimed in claim 1, further comprising:

a screen having a back for receiving said first and second polarized lights.

9. An image projecting apparatus, comprising:

means for generating a two-dimensional signal having an image arranged for each video field of said signal;

means responsive to said generating means for decomposing an image produced by said two-dimensional signal into lights with first and second images transversely offset with each other on a screen and constituting images for pseudo right and left eyes alternatively switched for each video field;

means responsive to said decomposing means for assigning first image to a first polarized light having directions of polarization different from each other for each period of said field;

means responsive to said assigning means for assigning said second image to a second polarized light having said directions of polarization different from each other for each period of said field and having a direction of polarization different from that of said first polarized light; and

means responsive to said two assigning means for projecting said first and second polarized lights, said second polarized light being delayed by one video field with respect to said first polarized light.

10. A method of projecting an image, comprising the steps of:

generating a stereoscopic-image signal having images for right and left eyes alternatively arranged for each video field of said image signal;

decomposing an image produced by said stereoscopic-image signal into lights with predetermined components;

dividing said lights into first and second groups;

assigning said first group to a first polarized light having directions of polarization different from each other for each period of said field;

assigning said second group to a second polarized light having said directions of polarization different from each other for each period of said field and having a direction of polarization different from that of said first polarized light; and

projecting said first and second polarized lights, said second polarized light being delayed by one video field with respect to said first polarized light.

11. A method as claimed in claim 10, wherein said lights include red, green, and blue lights.

12. A method as claimed in claim 10, wherein said first group includes red and blue lights, and said second group includes a green light.

13. A method as claimed in claim 10, wherein said first and second polarized lights include linear polarized lights perpendicular to each other.

14. A method as claimed in claim 10, wherein said first and second polarized lights include circular polarized lights having directions of rotation opposite to each other.

15. A method as claimed in claim 11, wherein said lights further include a brightness light.

16. A method as claimed in clam 10, wherein said first group includes red, green, and blue lights, and said second group includes a brightness light.

17. A method of projecting an image on a screen, comprising the steps of:

generating a two-dimensional signal having an image arranged for each video field of said signal;

decomposing an image produced by said two-dimensional signal into lights with first and second images transversely offset with each other on the screen and constituting images for pseudo right and left eyes alternatively switched for each video field;

assigning first image to a first polarized light having directions of polarization different from each other for each period of said field;

assigning said second image to a second polarized light having said directions of polarization different from each other for each period of said field and having a direction of polarization different from that of said first polarized light; and

projecting said first and second polarized lights, said second polarized light being delayed by one video field with respect to said first polarized light.