Autostereoscopic display device

• US 5,465,175 A
• Filed: 11/10/1993
• Issued: 11/07/1995
• Est. Priority Date: 11/11/1992
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ezra, David, Woodgate, Graham J.
• Primary Examiner(s): Dzierzynski, Paul M.
• Assistant Examiner(s): Chang, Audrey Y.
• Application Number:
  US08/150,369
• Time in Patent Office: 727 Days
• Field of Search: 359/462, 359/463, 359/464, 359/619, 359/621, 359/626, 359/277, 359/48, 359/49, 359/41
• US Class Current: 359/463
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G09F 19/12 using special optical effects
• CPC Class Codes: G09F 19/14 displaying different signs depending upon the view-point of the observer
• CPC Class Codes: H04N 13/305 using lenticular lenses, e.g. arrangements of cylindrical lenses
• CPC Class Codes: H04N 13/31 using parallax barriers
• CPC Class Codes: H04N 13/32 using arrays of controllable light sources; using moving apertures or moving light sources

Abstract

An auto stereoscopic 3D display comprises a hybrid sandwich comprising a first lenticular screen, a spatial light modulator, a diffuser, and second lenticular screen. A plurality of light sources produce in turn divergent light beams which are modulated by the modulator with two interlaced views. The hybrid sandwich projects the views in different directions towards an observer. The different 2D views are thus visible from directions corresponding to the directions in which the views were captured during recording of a 3D image. Each eye of the observer sees a single view across the whole of the display.

Claims

1. A display for producing an autostereoscopic image, comprising:

at least one light source for producing a divergent beam of light;

a spatial light modulator comprising a plurality of light modulating cells for modulating light passing therethrough from the at least one light source in accordance with image data;

a first array of optical components arranged to receive the divergent light beam from the at least one light source, each of the optical components being arranged to produce an image of the at least one source at a common image plane such that each image is laterally displaced by a respective predetermined amount from an optical axis of the corresponding optical component and the respective predetermined amounts vary progressively across the common image plane; and

a second array of optical components having a common object plane which coincides with the common image plane.

2. A display as claimed in claim 1, wherein the first array of optical components is located between the at least one light source and the spatial light modulator.

3. A display as claimed in claim 1, wherein the spatial light modulator is located between the at least one light source and the first array of optical components.

4. A display as claimed in claim 1, wherein the optical components of the first array are converging lenses.

5. A display as claimed in claim 1, wherein the optical components of the second array are converging lenses.

6. A display as claimed in claim 4, wherein the optical components of the second array are converging lenses, and the first and second arrays comprise first and second lenticular screens, respectively.

7. A display as claimed in claim 6, wherein each of the first and second lenticular screens comprises a plurality of parallel elongate lenticules having cylindrical convergent properties.

8. A display as claimed in claim 7, wherein the at least on light source comprises a linear array of light sources extending perpendicularly to the lenticules.

9. A display as claimed in claim 4, wherein the optical components of the second array are converging lenses, end the first end second arrays comprise first and second two dimensional arrays of lenses, respectively.

10. A display as claimed in claim 9, wherein the optical components of the first and second arrays have spherical convergent properties.

11. A display as claimed in claim 9, wherein the at least one light source comprises a two dimensional array of light sources.

12. A display as claimed in claim 1, wherein the pitch of the optical components of the first array is substantially equal to the pinch of the light modulating cells of the spatial light modulator.

13. A display as claimed in claim 12, wherein the pitch of the optical components of the second array is greater than the pitch of the optical components of the first array.

14. A display as claimed in claim 13, wherein the pitch of the optical components of the second array is substantially equal to the product of the pitch of the optical components of the first array and an integer greater than 1.

15. A display as claimed in claim 1, wherein a diffuser is disposed at the common image plane.

16. A display as claimed in claim 1, wherein a field lens is disposed at the common image plane.

17. A display as claimed in claim 1, wherein the spatial light modulator comprises a liquid crystal device.

18. A display as claimed in claim 1, wherein the at least one light source comprises a plurality of light sources and in that each of the light sources is contiguous with the or each adjacent light source.

19. A display as claimed in claim 18, further comprising control means for sequentially illuminating the light sources.

20. A display as claimed in claim 19, wherein the control means is arranged to control the spatial light modulator in accordance with a plurality of sequentially presented images representing a frame of a three dimensional image, each image comprising at least one view.

21. A display as claimed in claim 1, wherein the optical components of the first array produce the image of the at least one light source by refracting the received divergent light beam.