HIGH CONTRAST PROJECTION SCREEN

• US 20170153450A1
• Filed: 11/27/2015
• Published: 06/01/2017
• Est. Priority Date: 11/23/2005
• Status: Active Grant

• Current Assignee: Fusao Ishii
• Original Assignee: Fusao Ishii
• Inventors: Ishii, Fusao
• Granted Patent: US 10,175,479 B2
• Time in Patent Office: Days
• 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 comprising:

a projector and

a screen with a reflecting surface comprising a hologram having a plurality of spectrums of reference light and object light for recording,

wherein said spectrums of said reference light and object light are substantially matching those of incident lights project from the projector to said screen and a direction of the reference light to create the hologram is substantially toward the projector and the direction of the object light is substantially toward the viewer.

2. The projection screen of claim 1 wherein:

reference and object beams are exposed onto the screen and the object beam is reflected by a free shaped mirror or passed through a free shaped lens so that the curvature of the free shaped mirror or free shaped lens is designed to direct the reflected light of incident light toward pre-designated directions.

3. The projection screen of claim 1 wherein:

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

5. The projection screen of claim 1 wherein:

the backing sheet is transparent for the viewers to see through the projection screen.

4. A projection screen comprising:

a hologram exposed with a reference beam and an object beam reflected by a free shaped mirror or passed through free shaped lens wherein the curvature of the free shaped mirror and lens is to reflect a light projected from an image projector to a projection screen without distortion and color aberration.

6. A projection system comprising:

a projector and

a screen covered with Fresnel lens or layer(s) for reflecting a plurality of spectrums wherein said spectrums are substantially matching incident lights projected from said projector onto the surface of said screen.

7. The projection system of claim 6 further comprising:

a dark backing sheet to absorb the light transmitted through said Fresnel lens or layer(s) covering the screen and the screen scatters the incident lights.

8. The projection system of claim 6 further comprising:

a transparent backing sheet for the viewers to see through said projection 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 wherein:

said layer(s) covering over the projection screen further 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 preprogramed direction to a segmented area of said photo-sensitive film and to expose the segmented area with said laser beams and to 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 preprogramed direction to a segmented area of said photo-sensitive film and to expose the segmented area with said laser beams and to scan said photo-sensitive film to expose the entire area of said photo-sensitive film

12. The head-up-display system of claim 11 wherein:

the image of said display is horizontally reversed so that reflected images have a normal direction.

13. The head-up-display system of claim 11 wherein:

the system has at least one user interface to the mobile phone so that a viewer can control the mobile phone and the user interface is selected from a group of button, button in a steering wheel, voice recognition and gesture.

14. The head-up-display system of claim 11 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 has layers from a group of an UV shielding layer, photo-chromic layer and electro-chromic layer.

21. The head-up-display system of claim 11 further comprising:

a heat sink is attached to the mobile phone.

11-1. A head-up-display system comprising:

a mobile phone having a display and

a screen with a reflecting surface comprising hologram having a plurality of spectrums of reference light and object light for recording,

wherein said spectrums of said reference light and object light are matching those of incident lights from said display of said mobile phone to said screen and

the direction of recording lights to create hologram is substantially toward viewers for object beam and substantially from a point where the mobile phone is placed for reference beam and a backing film of said reflecting surface is transparent.

15. A head-up-display system comprising:

a mobile phone having a display and

a screen with layer(s) reflecting a plurality of spectrums wherein said spectrums are matching those of incident lights from said display of the mobile phone

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

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

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

the system has at least one user interface for a viewer to control the mobile phone wherein the user interface is from a group of button, button in a steering wheel, voice recognition and gesture functions.

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

the system has a magnifying lens from a group of convex lens, concave lens and Fresnel lens, curved mirror and Fresnel mirror to enlarge a projected image.

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

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

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

22. The head-up-display system of claim 15 further comprising:

a heat sink is attached to the mobile phone.

20. A head-up-display system comprising:

a mobile phone having a display and

a screen with a layer(s) 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 the transparent backing sheet has layers from

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

23. The head-up-display system of claim 20 further comprising:

a heat sink is attached to the mobile phone.

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

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

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

the system has at least one user interface for a viewer to control a mobile phone wherein the user interface is one from a group of button, button in a steering wheel, voice recognition and gesture recognition.

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

the system has a magnifying lens from a group of convex lens, concave lens, Fresnel lens, curved mirror and Fresnel mirror to enlarge a projected image.

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

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

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