PROJECTION DEVICE AND PROJECTION-TYPE VIDEO DISPLAY DEVICE

• US 20130169941A1
• Filed: 09/08/2011
• Published: 07/04/2013
• Est. Priority Date: 09/08/2010
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Kurashige, Makio, Ishida, Kazutoshi, Takanokura, Tomoe, Ooyagi, Yasuyuki
• Granted Patent: US 8,950,871 B2
• Time in Patent Office: Days
• US Class Current: 353/38
• CPC Class Codes: G02B 26/0816 by means of one or more reflecting elements
• CPC Class Codes: G02B 26/103 having movable or deformable optical fibres, light guides or waveguides as scanning elements light guides per se G02B6/00
• CPC Class Codes: G02B 26/105 with one or more pivoting mirrors or galvano-mirrors G02B26/101 takes precedence
• CPC Class Codes: G02B 26/123 Multibeam scanners, e.g. using multiple light sources or beam splitters
• CPC Class Codes: G02B 26/124 Details of the optical system between the light source and the polygonal mirror G02B26/123, G02B26/127 take precedence
• CPC Class Codes: G02B 27/1066 for enhancing image performance, like resolution, pixel numbers, dual magnifications or dynamic range, by tiling, slicing or overlapping fields of view
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G02B 5/0252 using holographic or diffractive means
• CPC Class Codes: G03B 21/2033 LED or laser light sources
• CPC Class Codes: G03B 21/2046 Positional adjustment of light sources
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: G03H 1/00 Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
• CPC Class Codes: G03H 1/22 Processes or apparatus for obtaining an optical image from holograms G03H1/26 - G03H1/34 take precedence
• CPC Class Codes: G03H 1/2286 Particular reconstruction light G03H1/24 takes precedence; Beam properties
• CPC Class Codes: G03H 1/32 Systems for obtaining speckle elimination
• CPC Class Codes: G03H 2222/36 Scanning light beam
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20
• CPC Class Codes: H04N 9/3161 : using laser light sources using laser beams scanning the display screen H04N9/3129
• CPC Class Codes: H04N 9/3164 : using multiple light sources

Abstract

Provided are a projection device and a projection-type video display device capable of displaying a plurality of videos, allowing speckles to be inconspicuous, and miniaturizing an optical system. A projection device includes an optical element including light diffusion elements capable of diffusing light, an irradiation device configured to irradiate the optical element with illumination light beams, each illumination light beam scanning the corresponding light diffusion element, spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused, and projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen. The illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator.

Claims

1. A projection device displaying video corresponding to each screen on a plurality of the screens, comprising:

an optical element comprising a plurality of light diffusion elements capable of diffusing light;

an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element;

spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused; and

projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen,

wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator, and

wherein the irradiation device comprises;

a light source configured to generate a coherent light beam;

a light division unit configured to divide the coherent light beam from the light source to generate a plurality of divided light beams;

optical fibers, each optical fiber transmitting each divided light beam from the light division unit; and

a scan device configured to change propagation direction of each divided light beam transmitted by the optical fibers and allow each divided light beam as each illumination light beam to scan the corresponding light diffusion element.

2. The projection device according to claim 1, wherein the scan device comprises mirrors which reflect the divided light beams and changes propagation direction of each divided light beam by changing a direction of each mirror.

3. The projection device according to claim 1, wherein the scan device changes propagation direction of each divided light beam by changing direction of emitting end of each optical fiber.

4. The projection device according to claim 2, wherein each divided light beam is irradiated to one point of the corresponding mirror, each divided light beam reflected by the one point of the mirror constitutes a diverging flux from the corresponding one point, and each diverging flux is incident on the corresponding light diffusion element.

5. The projection device according to claim 2,

wherein each divided light beam is irradiated to one point of the corresponding mirror, and each divided light beam reflected by the one point of the mirror constitutes a diverging flux from the corresponding one point, and

wherein the projection device further comprises a parallel light generation unit which propagates each light beam constituting each diverging flux in a certain direction to generate parallel light flux and allows each parallel light flux to be incident on the corresponding light diffusion element.

13. The projection device according to claim 1, wherein the light diffusion element is a hologram recording medium.

14. The projection device according to claim 1, wherein the light diffusion element is a lens array.

17. A projection-type video display device comprising:

the projection device according to claim 1; and

screens on which modulation images obtained on the spatial light modulators are projected.

6. A projection device displaying video corresponding to each screen on a plurality of the screens, comprising:

an optical element comprising a plurality of light diffusion elements capable of diffusing light;

an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element;

spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused; and

projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen,

wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator, and

wherein the irradiation device comprises;

a light source configured to generate a coherent light beam;

a light division unit configured to divide the coherent light beam from the light source to generate a plurality of divided light beams;

a scan device configured to change propagation direction of each divided light beam from the light division unit; and

optical fibers, each optical fiber transmitting each divided light beam incident from the scan device and irradiating the optical element with each divided light beam as each illumination light beam, and

wherein the scan device allows each illumination light beam to scan the corresponding light diffusion element.

7. The projection device according to claim 6, wherein each illumination light beam constitutes a diverging flux from an emitting end of the corresponding optical fiber, and each diverging flux is incident on the corresponding light diffusion element.

15. The projection device according to claim 6, wherein the light diffusion element is a hologram recording medium.

16. The projection device according to claim 6, wherein the light diffusion element is a lens array.

18. A projection-type video display device comprising:

the projection device according to claim 6; and

screens on which modulation images obtained on the spatial light modulators are projected.

8. A projection device displaying video corresponding to each screen on a plurality of the screens, comprising:

an optical element comprising a plurality of light diffusion elements capable of diffusing light;

an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element;

spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused; and

projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen,

wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator, and

wherein the irradiation device comprises;

a light source configured to generate a coherent light beam;

a light division unit configured to divide the coherent light beam from the light source to generate a plurality of divided light beams;

mirror optical systems, each mirror optical system transmitting each divided light beam from the light division unit; and

a scan device configured to change propagation direction of each divided light beam incident from the mirror optical systems and allow each divided light beam as each illumination light beam to scan the corresponding light diffusion element.

9. The projection device according to claim 8,

wherein the scan device comprises mirrors which reflect the divided light beams and changes propagation direction of each divided light beam by changing a direction of each mirror, and

wherein each divided light beam is irradiated to one point of the corresponding mirror, each divided light beam reflected by the one point of the mirror constitutes a diverging flux from the corresponding one point, and each diverging flux is incident on the corresponding light diffusion element.

10. The projection device according to claim 8,

wherein the scan device comprises mirrors which reflect the divided light beams and changes propagation direction of each divided light beam by changing a direction of each mirror,

wherein each divided light beam is irradiated to one point of the corresponding mirror, each divided light beam reflected by the one point of the mirror constitutes a diverging flux from the corresponding one point, and

wherein the projection device further comprises a parallel light generation unit which propagates each light beam constituting each diverging flux in a certain direction to generate parallel light flux and allows each parallel light flux to be incident on the corresponding light diffusion element.

19. A projection-type video display device comprising:

the projection device according to claim 8; and

screens on which modulation images obtained on the spatial light modulators are projected.

11. A projection device displaying video corresponding to each screen on a plurality of the screens, comprising:

an optical element comprising a plurality of light diffusion elements capable of diffusing light;

an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element;

spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused; and

projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen,

wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator, and

wherein the irradiation device comprises;

a light source configured to generate a coherent light beam;

a scan device configured to change a propagation direction of the coherent light beam from the light source;

a collimation optical system configured to collimate the coherent light beam from the scan device;

a light division unit configured to divide the collimated coherent light beam to generate a plurality of divided light beams; and

mirror optical systems, each mirror optical system transmitting each divided light beam from the light division unit and irradiating the optical element with each divided light beam as each illumination light beam, and

wherein the scan device allows each illumination light beam to scan the corresponding light diffusion element.

12. The projection device according to claim 11, wherein each illumination light beam constitutes a parallel light flux, and each parallel light flux is incident on the corresponding light diffusion element.