Image quality in an image display device

• US 7,808,591 B2
• Filed: 09/09/2004
• Issued: 10/05/2010
• Est. Priority Date: 09/20/2003
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Schoellmann, Volker, Karman, Gerardus P.
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Steinberg; Jeffrey S
• Application Number:
  US10/571,823
• Publication Number:
  US 20060279680A1
• Time in Patent Office: 2,217 Days
• Field of Search: 345/32, 345/87, 349/18
• US Class Current: 349/116
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: H04N 13/31 using parallax barriers

Abstract

A display device for displaying a three dimensional image such that different views are displayed according to the viewing angle. The display device includes a display panel having separately addressable pixels for displaying the image, where the pixels are grouped such that different pixels in a group correspond to different views. The display device further includes a retarder in optical association with the display panel. The retarder includes retarder pixels, where at least one retarder pixel is associated with each corresponding pixel in the display panel. Optical parameters of the retarder pixels are varied as function of the viewing angle associated with the corresponding pixel in the display panel.

Claims

1. A display device for displaying a three dimensional image such that different views are displayed according to different viewing angles, the display device including:

a display panel having a plurality of separately addressable pixels for displaying said image, the pixels being grouped such that different pixels in a group correspond to different views of the image; and

a retarder in optical association with the display panel, the retarder comprising a plurality of separately controllable retarder pixels, each retarder pixel being associated with at least one corresponding pixel in the display panel;

wherein at least one optical parameter of each retarder pixel is varied as a function of viewing angle relative to the at least one corresponding pixel in the display panel.

2. The display device according to claim 1 in which one retarder pixel of the plurality of retarder pixels is associated with one pixel in the display panel.

3. The display device according to claim 1 wherein one retarder pixel of the plurality of retarder pixels is associated with a plurality of corresponding pixels in the display panel.

4. The display device according to claim 1 wherein each retarder pixel of the plurality of retarder pixels is associated with a single corresponding pixel in the display panel.

5. The display device according to claim 1 wherein the retarder is positioned in front of the display panel.

6. The display device according to claim 1 wherein the retarder is positioned behind the display panel.

7. The display device according to claim 1 wherein the thickness of the retarder is varied as a function of the viewing angle associated with the at least one corresponding pixel in the display panel.

8. The display device according to claim 1 wherein orientation of director molecules that constitute the retarder pixels is varied as a function of viewing angle associated with the at least one corresponding pixel in the display panel.

9. The display device according to claim 8 wherein tilt angle of the retarder pixels is varied as a function of viewing angle associated with the at least one corresponding pixel in the display panel.

10. The display device according to claim 8 wherein azimuthal angle of the retarder pixels is varied as a function of viewing angle associated with the at least one corresponding pixel in the display panel.

11. The display device according to claim 8 wherein splay and bend profile of the retarder pixels is varied as a function of viewing angle associated with the at least one corresponding pixel in the display panel.

12. The display device according to claim 1 wherein refractive indices of the retarder pixels are varied as a function of viewing angle associated with the at least one corresponding pixel in the display panel.

13. The display panel according to claim 12 wherein birefringence of the retarder pixels is varied as a function of viewing angle associated with the at least one corresponding pixel in the display panel.

14. The display device according to claim 1 wherein more than one optical parameter is varied in one or more of the retarder pixels.

15. The display device according to claim 1 wherein different optical parameters are varied in each retarder pixel.

16. The display device according to claim 1 wherein the same optical parameter is varied in each retarder pixel.

17. The display device according to claim 1 wherein the retarder pixels comprise all of the pixels in the retarder.

18. The display device according to claim 1 wherein the retarder pixels comprise some, but not all of the pixels in the retarder.

21. The display device of claim 1, wherein a contrast of each pixel of the plurality of separately addressable pixels is changed without substantially affecting a contrast of any other pixel of the plurality of separately addressable pixels.

22. The display device of claim 1, wherein said altering comprises changing a contrast of each pixel of the plurality of separately addressable pixels without substantially affecting a contrast of any other pixel of the plurality of separately addressable pixels.

19. A method for displaying a three dimensional image on a display device comprising a retarder including a plurality of separately controllable retarder pixels, the method comprising:

displaying an image on a plurality of separately addressable pixels in a display panel, the pixels being grouped such that different pixels in a group correspond to different views of the image; and

altering the displayed image by varying at least one optical parameter of at least one retarder pixel as a function of viewing angle associated with a pixel of the display device.

20. The method according to claim 19

wherein the displayed image is altered by varying a plurality of optical parameters associated with the plurality of retarder pixels.