High contrast projection screen

• US 10,175,479 B2
• Filed: 11/27/2015
• Issued: 01/08/2019
• Est. Priority Date: 11/23/2005
• Status: Expired due to Fees

• Current Assignee: Fusao Ishii
• Original Assignee: Fusao Ishii
• Inventors: Ishii, Fusao
• Primary Examiner(s): Alexander, William R
• Assistant Examiner(s): Gagnon, Grant A
• Application Number:
  US14/953,294
• Publication Number:
  US 20170153450A1
• Time in Patent Office: 1,138 Days
• Field of Search: 359 1- 35
• CPC Class Codes: G02B 2027/0109 comprising details concerning the making of holograms
• CPC Class Codes: G02B 2027/011 comprising device for correcting geometrical aberrations, distortion
• CPC Class Codes: G02B 2027/0112 comprising device for genereting colour display
• CPC Class Codes: G02B 2027/0116 comprising devices for correcting chromatic aberration
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/0127 comprising devices increasing the depth of field
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 27/0103 comprising holographic elements
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 21/567 for colour projection G03B21/58, G03B21/60 take precedence
• CPC Class Codes: G03B 21/62 Translucent screens
• CPC Class Codes: G03H 1/0248 Volume holograms
• CPC Class Codes: G03H 1/0465 Particular recording light; Beam shape or geometry G03H1/06 takes precedence
• CPC Class Codes: G03H 2001/0439 for recording Holographic Optical Element [HOE] HOE per se G02B5/32
• CPC Class Codes: G03H 2001/0478 Serial printer, i.e. point oriented processing
• CPC Class Codes: G03H 2001/2231 Reflection reconstruction
• CPC Class Codes: G03H 2222/18 RGB trichrome light
• CPC Class Codes: G03H 2222/36 Scanning light beam
• CPC Class Codes: H04M 1/0272 : for a projector or beamer module assembly constructional features of projectors per se G03B21/00; constructional details of projectors using electronic spatial light modulators per se H04N9/31
• CPC Class Codes: H04M 2250/54 : including functional features of a projector or beamer module assembly constructional features concerning the integration of projectors in portable phones H04M1/0272

Abstract

An image display system includes a reflecting screen that has a reflecting surface. The reflecting surface includes hologram which reflects narrow bands of spectrum of incident lights toward desired direction. A projection display system includes a reflecting mirror(s) with hologram so that the image can be projected nearly vertical or short distance. This invention can be used as a head-up-display with improved brightness and eliminating ghost noise.

Claims

1. A projection system for providing a holographic view to a viewer comprising:

a projector and

a screen with a reflecting surface comprising a hologram recorded from a plurality of spectrums generated from an interference of a reference light and an object light,

wherein said spectrums of said reference light and object light are substantially matching spectrums of incident lights projected from the projector to said screen; and

the hologram on the screen receives the reference light substantially along a direction toward the projector and the screen receives the object light along a direction of toward the viewer.

2. The projection system of claim 1 wherein:

the reference and object beams are projected onto the screen wherein the object beam is reflected by a free shaped mirror whereby the free shaped mirror directs a reflected light of incident light from the screen toward pre-designated directions.

3. The projection system of claim 1 wherein:

the screen further comprises a dark backing sheet to absorb the light transmitting through said hologram and a front surface of the screen scatters the incident lights.

4. The projection system of claim 1 wherein:

the screen having a transparent backing sheet for the viewer to see through the screen.

5. A projection screen comprising:

a hologram exposed with a reference beam and an object beam reflected by a free shaped mirror wherein a curvature of the free shaped mirror reflects a light projected from an image projector to a projection screen with a reduced distortion and color aberration.

6. A projection system comprising:

a projector and

a screen covered with Fresnel lens for reflecting a plurality of spectrums wherein said spectrums substantially match incident lights projected from said projector onto said screen.

7. The projection system of claim 6 further comprising:

a dark backing sheet to absorb lights transmitted through said Fresnel lens and the screen scatters the incident lights.

8. The projection system of claim 6 further comprising:

a transparent backing sheet for a viewer to see through said screen and the transparent backing sheet has layers from a group of

an UV shielding layer, photo-chromic layer and electro-chromic layer covering over the transparent backing sheet.

9. The projection system of claim 6 further comprising:

layers covering over the screen composed of materials selected from a group of multi-layer dielectrics and cholesteric liquid crystal.

10. A method of fabricating a hologram comprising:

coating a photo-sensitive film on a projection screen;

projecting at least two coherent laser beams from a laser source;

directing the laser beams by Galvano-mirrors to project to a preprogrammed direction projecting the laser beams to a segmented area of said photo-sensitive film and to expose the segmented area with said laser beams and continuously scan said Galvano-mirrors to expose the entire area of said photo-sensitive film.

11. A method of fabricating a hologram comprising:

coating a photo-sensitive film on a projection screen;

projecting at least two coherent laser beams from a laser source;

directing the laser beams by Galvano-mirrors to project to a preprogrammed directions to a segmented area of said photo-sensitive film and to continuously scan said photo-sensitive film to expose the entire area of said photo-sensitive film.

12. A head-up-display system comprising:

a mobile phone having a display and

a screen with a reflecting surface comprising a hologram recorded from a plurality of spectrums of reference light and object light,

wherein said spectrums of said reference light and object light are substantially matching spectrums of incident lights projected from the projector to said screen; and

the hologram on the screen is recorded by an object beam projected along a direction substantially toward a viewer using the mobile phone and substantially from a point where the mobile phone is placed for reference beam and a backing film of said reflecting surface is transparent.

13. The head-up-display system of claim 12 further comprising:

a heat sink attached to the mobile phone.

14. The head-up-display system of claim 12 wherein:

an image of said display is horizontally reversed whereby reflected images from the display have a normal direction to the viewer.

15. The head-up-display system of claim 12 wherein:

the system has at least one user interface to interface with the mobile phone for the viewer to control the mobile phone.

16. The head-up-display system of claim 12 further comprising:

a transparent backing sheet for the viewer to see through said projection screen and the transparent backing sheet; and

the transparent backing sheet comprises layers selected from a group of an UV shielding layer, photo-chromic layer and electro-chromic layer.

17. A head-up-display system comprising:

a mobile phone having a display and a screen with a holographic layer for reflecting a plurality of spectrums wherein said spectrums are matched with the spectrums of incident lights from said display of the mobile phone.

18. The head-up-display system of claim 17 wherein:

the image of said display image is reversed for displaying reflected images along a normal direction to the viewer by applying a group of software control functions and an additional mirror.

19. The head-up-display system of claim 17 wherein:

the system has at least one user interface for a viewer to interface with and control the mobile phone.

20. The head-up-display system of claim 17 wherein:

the system further comprises a magnifying lens including a group of convex lens, concave lens and Fresnel lens, curved mirror and Fresnel mirror to enlarge a projected image.

21. The head-up-display system of claim 17 wherein:

a transparent backing sheet for the viewers to see through said projection screen and the transparent backing sheet; and

the transparent backing sheet further comprises layers selected from a group of an UV shielding layer, photo-chromic layer and transmissivity variable layer.

22. The head-up-display system of claim 17 further comprising:

a heat sink attached to the mobile phone.

23. A head-up-display system comprising:

a mobile phone having a display and

a screen includes a partially transparent layer for partially reflecting an incoming light and partially passing the incoming light; and

a transparent backing sheet for a viewer to see through said screen and wherein the transparent backing sheet comprises layers selected from an UV shielding layer, photo-chromic layer and electro-chromic layer covering over the transparent backing sheet.

24. The head-up-display system of claim 23 further comprising:

a heat sink attached to the mobile phone.

25. The head-up-display system of claim 23 wherein:

an image is reversed for displaying reflected images along a normal direction to a viewer by applying a group of software and an additional mirror.

26. The head-up-display system of claim 23 further comprising:

at least one user interface for a viewer to interface and control a mobile phone.

27. The head-up-display system of claim 23 further comprising:

a magnifying lens including convex lens, concave lens, Fresnel lens, curved mirror and Fresnel mirror to enlarge a projected image.

28. The head-up-display system of claim 23 further comprising:

a transparent backing sheet for the viewers to see through said projection screen and the transparent backing sheet; and

the transparent backing sheet further includes layers selected from a group of an UV shielding layer, photo-chromic layer and electro-chromic layer.