Methods for manufacturing micropolarizers

• US 6,384,971 B1
• Filed: 11/19/1998
• Issued: 05/07/2002
• Est. Priority Date: 06/11/1990
• Status: Expired due to Fees

• Current Assignee: Reveo, Inc.
• Original Assignee: Reveo, Inc.
• Inventors: Faris, Sadeg M.
• Primary Examiner(s): Hellner, Mark
• Application Number:
  US09/197,307
• Time in Patent Office: 1,265 Days
• Field of Search: 359/483, 359/489, 359/246, 359/252, 359/254, 359/259
• US Class Current: 359/486.02
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 27/28 for polarising used in stereoscopes G02B30/25
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: G03B 21/132 Overhead projectors, i.e. capable of projecting hand-writing or drawing during action epidiascopic projectors G03B21/08
• CPC Class Codes: G06F 3/011 Arrangements for interaction with the human body, e.g. for user immersion in virtual reality blind teaching G09B21/00
• CPC Class Codes: H04N 13/00 Stereoscopic video systems; Multi-view video systems; Details thereof
• CPC Class Codes: H04N 5/7441 the modulator being an array of liquid crystal cells
• CPC Class Codes: H04N 5/7491 of head mounted projectors

Abstract

A method of mass producing a micropolarizer including the steps exposing films of predetermined polarization states to electromagnetic radiation through masks of predetermined patterns, etching away exposed parts of each film and aligning and laminating the films to one another to provide a micropolarizer comprising alternating sets of microscopic polarizers with different polarization states.

Claims

1. A system for fabricating a micropolarization panel for use in stereoscopic viewing a 3-D object recorded in a spatially multiplexed image of said 3-D object, said system comprising:

film providing apparatus for providing a supply of film material characterized by an ability to either phase shift or polarize light passing therethrough;

film coating apparatus for coating said film material with a protective mask having a predetermined pattern that exposes preselected parts of said film material; and

film treating apparatus for treating said film material with said protective mask so as to permanently form first and second optically transparent patterns therein, wherein said first optically transparent pattern imparts a first polarization state, P1, to light emanating from pixels through said first optically transparent pattern, and said second optically transparent pattern imparts a second polarization state, P2, to light emanating from pixels through said second optically transparent pattern, and wherein said first optically transparent pattern is a logical inverse of said second optically transparent pattern; and

film cutting apparatus for cutting said treated film material so as to form a micropolarization panel for use in stereoscopic viewing of a 3-D object recorded in a spatially-multiplexed image of said 3-D object.

2. The system of claim 1, wherein said first and second polarization states are linear polarization states which are oriented 90°

from one another.

3. The system of claim 1, wherein said film treating apparatus comprises apparatus for applying a caustic agent to said film coated with said protective mask.

4. The system of claim 1, which further comprises laminating apparatus for applying a lamination layer upon said treated film material.

5. The system of claim 1, wherein said film providing apparatus comprises first and second rotatable drums for supporting and transporting said film material.

6. A method for fabricating a micropolarization panel for use in stereoscopic viewing a 3-D object recorded in a spatially multiplexed image of said 3-D object, said method comprising the steps of:

(a) providing a sheet of wave retarder film material;

(b) applying a protective coating to said wave retarder film material; and

(c) chemically treating said wave retarder film material to selectively remove portions thereof to produce first and second optically transparent patterns in said sheet of wave retarder film material so as to provide a micropolarization panel for use in stereoscopic viewing of a 3-D object recorded in a spatially-multiplexed image of said 3-D object, wherein said first optically transparent pattern imparts a first polarization state P1 to light emanating through said first optically transparent pattern, said second optically transparent pattern imparts a second polarization state P2 to light emanating through said second optically transparent pattern, and said second optically transparent pattern is the logical compliment pattern of said first optically transparent pattern.

7. The method of claim 6, wherein said sheet of wave retarder film is a sheet of half-wave retarder.

8. A system for fabricating a patterned polarizer film, comprising:

film providing apparatus for providing a film;

film coating apparatus for coating said film with a protective mask having a predetermined pattern that exposes preselected portions of said film; and

film treating means for thereafter treating said film to affect the preselected parts of said film to provide a pattern of polarized and unpolarized portions of said film, the polarized parts of the film having a first polarization state, P1.

9. The system of claim 8, wherein said film comprises a polarized film having the first polarization state, P1;

and wherein said film treating apparatus comprises polarization state removing apparatus for removing the polarization state of the preselected exposed portions of said film.

10. The system of claim 8, wherein said film comprises a polarized PVA film.

11. The system of claim 8, wherein said film comprises a cholesteric liquid crystal polarizer.

12. The system of claim 8, wherein said film comprises a half-wave retarder.

13. The system of claim 8, wherein said film comprises a quarter-wave retarder.

14. The system of claim 8, wherein said polarization state removing apparatus comprises means for applying an enchant or a solvent solution to the preselected exposed portions of said film.

15. The system of claim 8, which further comprises film laminating apparatus for laminating said film to a sheet of polarizer.

16. The system of claim 15, wherein the film is a retarder, and wherein the sheet of polarizer comprises a sheet of linear polarizer material.

17. The system of claim 8, wherein the film comprises a polarized film having the first polarization state, P1;

and

wherein said polarization state removing apparatus comprises means for etching away the preselected portions of said film to provide a pattern of polarized portions of said film.

18. A system for fabricating micropolarizing material for use in stereoscopic viewing a 3-D object recorded in a spatially multiplexed image of said 3-D object, said system comprising:

(a) apparatus for providing a film coated with a protective mask having a predetermined pattern that exposes preselected parts of the film; and

(b) apparatus for treating said film to affect the preselected parts of said film to provide micropolarization material for use in stereoscopic viewing of a 3-D object recorded in a spatially-multiplexed image of said 3-D object, having a pattern of polarized and unpolarized parts of the film, wherein the polarized parts of said film have a first polarization state, P1.

19. A method of fabricating a micropolarization panel for use in stereoscopic viewing a 3-D object recorded in a spatially multiplexed image of said 3-D object, said system comprising the steps of:

(a) providing a sheet of wave retarder film;

(b) applying a protective coating to said wave retarder film; and

(c) for chemically treating said wave retarder film to selectively remove portions thereof to produce first and second optically transparent patterns in said sheet of wave retarder film so as to provide a micropolarization panel for use in stereoscopic viewing of a 3-D object recorded in a spatially-multiplexed image of said 3-D object,

whereby said first optically transparent pattern imparts a first polarization state P1 to light emanating through said first optically transparent pattern, said second optically transparent pattern imparts a second polarization state P2 to light emanating through said second optically transparent pattern, and said second optically transparent pattern is the logical compliment pattern of said first optically transparent pattern.