US20080225361A1 - Light Source Device, and Two-Dimensional Image Display Device - Google Patents

Light Source Device, and Two-Dimensional Image Display Device Download PDF

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Publication number
US20080225361A1
US20080225361A1 US10/588,107 US58810705A US2008225361A1 US 20080225361 A1 US20080225361 A1 US 20080225361A1 US 58810705 A US58810705 A US 58810705A US 2008225361 A1 US2008225361 A1 US 2008225361A1
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Prior art keywords
light source
light
light sources
lights
emitted
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Abandoned
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US10/588,107
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English (en)
Inventor
Ken'ichi Kasazumi
Kiminori Mizuuchi
Akihiro Morikawa
Kazuhisa Yamamoto
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Panasonic Corp
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Matsushita Electric Industrial Co Ltd
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Assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. reassignment MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KASAZUMI, KEN'ICHI, MIZUUCHI, KIMINORI, MORIKAWA, AKIHIRO, YAMAMOTO, KAZUHISA
Publication of US20080225361A1 publication Critical patent/US20080225361A1/en
Assigned to PANASONIC CORPORATION reassignment PANASONIC CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Priority to US12/645,204 priority Critical patent/US8016427B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/1046—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators
    • G02B27/1053—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators having a single light modulator for all colour channels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1073—Beam splitting or combining systems characterized by manufacturing or alignment methods
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1086—Beam splitting or combining systems operating by diffraction only
    • G02B27/1093—Beam splitting or combining systems operating by diffraction only for use with monochromatic radiation only, e.g. devices for splitting a single laser source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/149—Beam splitting or combining systems operating by reflection only using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems

Definitions

  • reference numeral 700 denotes a conventional two-dimensional display device using laser light sources.
  • the two-dimensional image display device 700 comprises red, green, and blue laser light sources 701 a , 701 b , and 701 c , collimator lenses 704 a , 704 b , and 704 c , first and second dichroic mirrors 705 a and 705 b , a beam expander 702 , a light integrator 703 , a projection lens 10 , and a liquid crystal panel 71 .
  • the light that passes through the light integrator 703 and thereby has the uniform intensity distribution is focused on the liquid crystal panel 71 by the projection lens 710 (refer to Japanese Published Patent Application No. 10-293268 (Patent Document 1)).
  • the light source device can be further miniaturized.
  • the center axes of the optical propagation paths of the respective lights emitted from the at least two coherent light sources intersect at one point on the diffraction part.
  • the at least two coherent light sources are disposed on the same submount.
  • a compact light source device that emits R, G, and B lights can be provided.
  • the production process of the diffraction part can be reduced, thereby providing the light source device at lower cost.
  • the diffraction part comprises a single diffraction element, and the diffraction element diffracts the light emitted from at least one coherent light source so that the respective lights emitted from the at least two coherent light sources propagate through the same optical path.
  • the diffraction element is further provided with a lens function.
  • the respective lights emitted from the plural coherent light sources can irradiate the same planar region above the diffraction element.
  • the diffraction part comprises a first diffraction element for receiving at least two lights, and diffracting at least one of the received lights so that the received at least two lights propagate through the same optical path; and a second diffraction element for diffracting the light emitted from at least one coherent light source among the at least two coherent light sources so that the center axes of the optical propagation paths of the lights emitted from the respective coherent light sources intersect at one point on the first diffraction element.
  • the respective lights emitted from the plural coherent light sources can irradiate the same region of the first diffraction element that is disposed above the second diffraction element.
  • the diffraction element is regionally divided, and the respective lights that are diffracted in the divided regions of the diffraction element irradiate the same planar region.
  • the diffraction element can be provided with the function of a light integrator, whereby the intensity distributions of the lights that irradiate the space can be made uniform.
  • the diffraction element is regionally divided in a lattice pattern.
  • the intensity distributions of the lights that irradiate the space can be made more uniform.
  • a two-dimensional image display device comprises at least two coherent light sources; a diffraction part for diffracting light emitted from at least one coherent light source so that the respective lights emitted from the at least two coherent light sources propagate in the same optical path; and a two-dimensional spatial light modulation element for receiving the respective lights that are diffracted by the diffraction part to be coaxial beams, said element being provided in a space above the diffraction part.
  • the two-dimensional image display according to the present invention further includes a control part for controlling the operations of the at least two coherent light sources, and the at least two coherent light sources are a coherent light source that emits red light, a coherent light source that emits green light, and a coherent light source that emits blue light, and the control part controls the three coherent light sources so that the coherent light sources are time-shared to sequentially emit lights.
  • a light source device having plural coherent light sources is provided with a diffraction part that diffracts the respective lights emitted from the coherent light sources so that the lights propagate in the same optical path. Therefore, an optical system for multiplexing the respective lights emitted from the plural coherent light sources into coaxial beams can be downsized, thereby providing an ultracompact light source device.
  • the light emitted from at least one coherent light source among the plural coherent light sources passes through the diffraction part without being diffracted by the diffraction part. Therefore, the number of gratings to be multiplexed on the diffraction part can be reduced, whereby the light source device can be constituted at low cost.
  • the diffraction part is constituted by first and second diffraction gratings, and the second diffraction grating diffracts the lights from the plural coherent light sources so that these lights irradiate the same region of the first diffraction element, while the first diffraction grating diffracts the respective lights that pass through the second diffraction element so that these lights become coaxial beams. Therefore, it is possible to provide a compact light source device which can easily multiplex the lights from the plural light sources to be coaxial beams.
  • the plural coherent light sources are disposed on the same submount. Therefore, heat radiation of the plural light sources can be carried out by heat radiation of the single submount, thereby facilitating heat radiation of the light source device.
  • FIGS. 1( a ) and 1 ( b ) are a side view and a plan view illustrating a construction of a light source device according to a first embodiment of the present invention.
  • FIGS. 4( a ) and 4 ( b ) are a side view and a plan view illustrating still another construction of a light source device according to the first embodiment of the present invention.
  • FIGS. 5( a ) and 5 ( b ) are a side view and a plan view illustrating a construction of a light source device according to a second embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a method for fabricating a first volume hologram of the diffraction part according to the second embodiment of the present invention, and more specifically, FIGS. 7( a ), 7 ( b ), and 7 ( c ) illustrate processes for fabricating gratings that diffract lights emitted from green, blue, and red laser light sources, respectively.
  • FIG. 9 is a diagram for explaining a method for fabricating a grating for green light of a diffraction part according to the third embodiment of the present invention, and more specifically, FIGS. 9( a ) ⁇ 9 ( d ) illustrate processes for performing interference exposure onto divided four regions that are arranged in one line.
  • FIG. 10 is a diagram for explaining a method for fabricating a grating for blue light of the diffraction part according to the third embodiment of the present invention, and more specifically, FIGS. 10( a ) ⁇ 10 ( d ) illustrate processes for performing interference exposure onto divided four regions that are arranged in one line.
  • FIG. 1 is a diagram illustrating the construction of the light source device according to the first embodiment, wherein FIG. 1( a ) is a side view and FIG. 1( b ) is a plan view.
  • reference numeral 100 denotes a light source device according to the first embodiment, and the light source device 100 is used as a light source for a two-dimensional image display device.
  • the light source device 100 includes coherent light sources, i.e., three semiconductor lasers 11 a ⁇ 11 c emitting red light, blue light, and green light (hereinafter referred to simply as “laser light sources”), and a submount 10 , such as a silicon substrate, on which the laser light sources 11 a ⁇ 11 c are directly mounted.
  • coherent light sources i.e., three semiconductor lasers 11 a ⁇ 11 c emitting red light, blue light, and green light
  • submount 10 such as a silicon substrate
  • the light source device 100 includes a diffraction unit 20 which is disposed above the submount 10 , and diffracts light beams emitted from at least one coherent light source, in this first embodiment, light beams emitted from the two laser light sources 11 a , 11 b , and 11 c , so that all the light beams emitted from the three coherent light sources become coaxial beams; and prisms 12 a , 12 b , and 12 c which are disposed on the submount 10 , and reflect the light beams emitted from the three laser light sources 11 a , 11 b , and 11 c so that the light beams emitted from the laser light sources 11 a , 11 b , and 11 c irradiate the same region of the diffraction unit 20 .
  • a spatial light modulation element 30 for spatially modulating the amplitudes of the respective lights which are converted to the coaxial beams by the diffraction unit 20 is disposed above the diffraction
  • the respective laser light sources 11 a ⁇ 11 c are surface-emitting lasers, and the red and green laser light sources 11 a and 11 b are disposed on a single straight line while the blue laser light source 11 b is disposed on a straight line that is perpendicular to the above-mentioned straight line.
  • the reflection angles of the reflection surfaces of the prisms 12 a , 12 b , and 12 c are set so that the light axes of the emitted lights from the laser light sources 11 a , 11 b , and 11 c , which are reflected at the reflection surfaces, and the light axis of the emitted light from the laser light source 11 b intersect at one point on the diffraction unit 20 .
  • the diffraction unit 20 comprises a single volume hologram.
  • a plurality of gratings for diffracting the lights emitted from the respective laser light sources 11 a ⁇ 11 c to convert these lights into coaxial beams are multiply-formed in the volume hologram.
  • the volume hologram of the first embodiment also has a lens function for condensing the respective lights that pass through the diffraction unit 20 so that the respective lights irradiate the same region of the spatial light modulation element 30 disposed above the diffraction part 20 .
  • FIG. 2 is a diagram illustrating a method for fabricating the volume hologram according to the first embodiment, wherein FIG. 2( a ) shows a method of forming a grating for the light emitted from the green light laser source 11 c , FIG. 2( b ) shows a method of forming a grating for the light emitted from the blue light laser source 11 b , and FIG. 2( c ) shows a method of forming a grating for the light emitted from the red light laser source 11 a.
  • a light source Lg 1 and a light source Lg 2 which have the same wavelength as that of the green light laser source 11 c are used for fabrication of a grating corresponding to the light emitted from the green light laser source 11 c .
  • the light sources Lg 1 and Lg 2 emit laser lights which are emitted from the same light source and divided.
  • light emitted from a single laser source is introduced into an optical fiber, and further, the fiber is divided into two fibers by a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the light sources Lg 1 and Lg 2 , respectively.
  • the light source Lg 1 is disposed so that its optical position with respect to the volume hologram 20 matches the position of the laser light source 11 c shown in FIGS. 1( a ) and 1 ( b ), and the light source Lg 2 is disposed in the center of projection that projects the light emitting surface of the diffraction part 20 onto the entire light receiving surface of the spatial light modulation element 30 .
  • the spatial light modulation electrode 30 is positioned directly above the diffraction part 20
  • the light source Lg 2 is disposed on a straight line that is perpendicular to the light emission surface of the diffraction part 20 (refer to FIG. 2( a )).
  • the volume hologram is subjected to interference exposure with the lights emitted from the light sources Lg 1 and Lg 2 . Thereby, an interference pattern is recorded on the volume hologram to fabricate a Bragg grating that diffracts and condenses the light emitted from the laser light source 11 c.
  • a light source Lb 1 and a light source Lb 2 which have the same wavelength as that of the blue light laser source 11 b are used for fabrication of a grating corresponding to the light emitted from the blue light laser source 11 b .
  • the light sources Lb 1 and Lb 2 emit laser lights which are emitted from the same light source and divided. For example, light emitted from a single laser source is introduced into an optical fiber, and further, the fiber is divided into two fibers by a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the light sources Lb 1 and Lb 2 , respectively.
  • the light source Lb 1 is disposed so that its optical position with respect to the volume hologram 20 matches the position of the laser light source 11 b shown in FIG. 1 , and the light source Lb 2 is disposed in the same position as the light source Lg 2 (refer to FIG. 2( b )). Then, the volume hologram is subjected to interference exposure with the lights emitted from the light sources Lb 1 and Lb 2 . Thereby, an interference pattern is further recorded on the volume hologram to fabricate a Bragg grating that condenses the light emitted from the laser light source 11 b.
  • a light source Lr 1 and a light source Lr 2 which have the same wavelength as that of the red light laser source 11 a are used for fabrication of a grating corresponding to the light emitted from the green light laser source 11 a .
  • the light sources Lr 1 and Lr 2 emit laser lights which are emitted from the same light source and divided. For example, light emitted from a single laser source is introduced into an optical fiber, and further, the fiber is divided into two fibers by a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the light sources Lr 1 and Lr 2 , respectively.
  • the light source Lr 1 is disposed so that its optical position with respect to the volume hologram 20 matches the position of the laser light source 11 a shown in FIG. 1 , and the light source Lr 2 is disposed in the same position as the light source Lg 2 (refer to FIG. 2( c )). Then, the volume hologram is subjected to interference exposure with the lights emitted from the light sources Lr 1 and Lr 2 . Thereby, an interference pattern is further recorded on the volume hologram to fabricate a Bragg grating that condenses the light emitted from the laser light source 11 a.
  • the interference exposure of the volume hologram must be carried out three times so that the gratings corresponding to the respective emitted lights from the three laser sources are formed in the single volume hologram, and therefore, each interference exposure is carried out with such a light intensity that the photosensitive material constituting the volume hologram is completely exposed by the three times of exposures.
  • the red, blue, and green laser lights emitted from the respective laser light sources 11 a , 11 b , and 11 c are multiplexed by the gratings corresponding to the respective lights in the diffraction part 20 so as to be coaxial beams as shown in FIG. 1 , and the coaxial beams irradiate the same area of the spatial light modulation element 30 , i.e., the light receiving surface. That is, the emitted lights from the red, blue, and green laser light sources 11 a , 11 b , and 11 c , which are reflected by the prisms, are respectively diffracted and condensed when passing through the diffraction part 20 . Thereby, the light emitted from the diffraction part 20 , which is obtained by multiplexing the lights emitted from the three laser light sources, irradiates the light receiving surface that is a given area of the spatial light modulation element 30 .
  • heat radiation of the three light sources can be carried out by heat radiation of the single submount 10 , whereby heat radiation of the light sources in the light source device can be facilitated.
  • surface-emitting lasers are adopted as the three light sources 11 a ⁇ 11 c , and the blue light laser is disposed on a straight line that is perpendicular to a straight line connecting the green light laser and the red light laser.
  • arrangement of the laser light sources is not restricted thereto.
  • the number of prisms disposed on the submount 10 can be reduced, whereby the cost of the light source device 100 can be reduced.
  • the first embodiment is described for the case where three coherent light sources are used, at least two light sources suffice.
  • three coherent light sources are used, at least two light sources suffice.
  • blue-green or yellow light may be provided in addition to the red, blue, and green lights, thereby providing a light source device that can represent a wider range of bright colors.
  • the light source device is used as a light source for a two-dimensional image display apparatus, and the spatial light modulation element 30 spatially varies the amplitude of the light emitted from the diffraction part 20 .
  • the light source device according to the first embodiment is not restricted to that for a two-dimensional image display device, and it may be used as a light source for a device, other than a two-dimensional image display device, in which the spatial light modulation element spatially varies the phase of the light from the diffraction part 20 .
  • reference numeral 200 denotes a light source device according to the second embodiment.
  • the light source device 200 is provided with a submount 10 such as a silicon substrate; three semiconductor laser light sources 21 a ⁇ 21 c which are disposed on the submount 10 , and emit red light, blue light, and green light, respectively (hereinafter simply referred to as “laser light sources”); and a diffraction part 220 which is disposed above the submount 10 and diffracts the respective lights emitted from the three laser light sources 21 a ⁇ 21 c so that the respective lights become coaxial beams.
  • a spatial light modulation element 30 for spatially varying the amplitudes of the lights that are converted to the coaxial beams by the diffraction part 220 is disposed above the diffraction part 220 .
  • the three laser light sources 21 a ⁇ 21 c are surface-emitting lasers that emit lights from upper surfaces of laser chips, and these lasers are disposed along a single straight line on the submount 10 .
  • the diffraction part 220 comprises two pieces of volume holograms (first and second volume holograms) 221 and 222 .
  • the second volume hologram 222 is disposed above the submount 10 , and diffracts the respective lights emitted from the three laser light sources 21 a ⁇ 21 c so that the light axes of the respective emitted lights intersect at one point on the first volume hologram which is disposed above the second volume hologram 222 , and further, condenses the respective emitted lights so as to irradiate the same area of the first volume hologram 221 .
  • the second volume hologram 222 is provided with a plurality of gratings according to the lights emitted from the respective laser light sources 21 a ⁇ 21 c , more specifically, a grating 222 a for red light, a grating 222 b for blue light, and a grating 222 c for green light, so that the respective lights irradiate the same region of the first volume hologram 221 .
  • the first volume hologram 221 further diffracts the emitted lights from the respective light sources, which are diffracted by the second volume hologram 222 , thereby converting the lights into coaxial beams.
  • a plurality of gratings are multiply-formed on the first volume hologram 221 , and the gratings diffract the emitted lights from the respective light sources, which pass through the second volume hologram 222 , so that these lights are converted to coaxial beams.
  • the intervals of the light sources 21 a ⁇ 21 c are reduced so that the lights emitted from the respective light sources overlap each other on the second volume hologram 222 . Therefore, on the second volume hologram 222 , the gratings 222 a ⁇ 222 c for red light, blue light, and green light are partially overlapped.
  • FIG. 6 is a diagram illustrating a method for fabricating the second volume hologram according to the second embodiment, wherein FIG. 6( a ) shows a method of fabricating a grating for green light, FIG. 6( b ) shows a method of fabricating a grating for blue light, and FIG. 6( c ) shows a method of fabricating a grating for red light.
  • FIG. 7 is a diagram illustrating a method for fabricating the first volume hologram according to the second embodiment, wherein FIG. 7( a ) shows a method of fabricating a grating for green light, FIG. 7( b ) shows a method of fabricating a grating for blue light, and FIG. 7( c ) shows a method of fabricating a grating for red light.
  • the second volume hologram 222 diffracts the lights emitted from the respective light sources 21 a ⁇ 21 c so that the light axes of these lights intersect at one point on the first volume hologram 221 , and condenses the respective emitted lights so that these lights irradiate the same region of the first volume hologram 221 .
  • a light source Lg 1 and a light source Lg 2 having the same wavelength as that of the green light laser source 21 c are used for fabrication of a grating corresponding to the light emitted from the green light laser source 21 c .
  • the light sources Lg 1 and Lg 2 emit laser lights which are emitted from the same light source and divided. For example, light emitted from a single laser light source is introduced into an optical fiber, and further, the optical fiber is divided into two fibers with a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the Lg 1 and Lg 2 .
  • the light source Lg 1 is disposed such that its optical position with respect to the volume hologram 222 matches the position of the laser light source 21 c shown in FIGS. 5( a ) and 5 ( b ), and the light source Lg 2 is disposed in the center of projection when a region in the second volume hologram 222 , which region is irradiated with the light emitted from the light source Lg 1 , is expanded and projected onto the entire surface of the first volume hologram 221 (refer to FIG. 6( a )). Then, the second volume hologram 222 is subjected to interference exposure by the lights emitted from the light sources Lg 1 and Lg 2 .
  • an interference pattern is recorded on the second volume hologram 222 to form a Bragg grating 222 c for diffracting and condensing the light emitted from the laser light source 21 c .
  • a region other than the region to be exposed should be shielded with a light shielding mask having apertures corresponding to the divided regions.
  • the light source Lb 2 is disposed in the center of projection when a region in the second volume hologram 222 , which region is irradiated with the light emitted from the light source Lb 1 , is expanded and projected onto the entire surface of the first volume hologram 221 (refer to FIG. 6( b )).
  • the second volume hologram 222 is subjected to interference exposure by the lights emitted from the light sources Lb 1 and Lb 2 .
  • an interference pattern is recorded on the second volume hologram 222 to form a Bragg grating 222 b for diffracting and condensing the light emitted from the laser light source 21 b .
  • a region other than the region to be exposed should be shielded with a light shielding mask having apertures corresponding to the divided regions.
  • a light source Lr 1 and a light source Lr 2 having the same wavelength as that of the green light laser source 21 a are used for fabrication of a grating corresponding to the light emitted from the red light laser source 21 a .
  • the light sources Lr 1 and Lr 2 emit laser lights which are emitted from the same light source and then divided. For example, light emitted from a single laser light source is introduced into an optical fiber, and further, the optical fiber is divided into two fibers with a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the Lr 1 and Lr 2 .
  • the light source Lr 1 is disposed such that its optical position with respect to the volume hologram 222 matches the position of the laser light source 21 a shown in FIGS.
  • the light source Lr 2 is disposed in the center of projection when a region in the second volume hologram 222 , which is irradiated with the light emitted from the light source Lr 1 , is expanded and projected onto the entire surface of the first volume hologram 221 .
  • the second volume hologram 222 is subjected to interference exposure by the lights emitted from the light sources Lr 1 and Lr 2 .
  • an interference pattern is recorded on the second volume hologram 222 to form a Bragg grating 222 a for diffracting and condensing the light emitted from the laser light source 21 a .
  • a region other than the region to be exposed should be shielded with a light shielding mask having apertures corresponding to the divided regions.
  • the first volume hologram 221 diffracts and condenses the lights that are emitted from the respective light sources 21 a ⁇ 21 c and pass through the second volume hologram 222 so that these lights become coaxial beams.
  • a lens Lc and a light source Lg 2 and a light source Lg 3 having the same wavelength as that of the green light laser source 21 c are used for fabrication of a grating corresponding to the light emitted from the green light laser source 21 c .
  • the light sources Lg 2 and Lg 3 emit laser lights which are emitted from the same light source and then divided. For example, light emitted from a single laser light source is introduced into an optical fiber, and further, the optical fiber is divided into two fibers with a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the Lg 2 and Lg 3 .
  • the interference exposure of the first volume hologram 221 is carried out such that the light sources Lg 1 and Lg 2 shown in FIG. 7( a ) are replaced with a light source Lb 2 and a light source Lb 3 having the same wavelength as that of the blue light laser source 21 b as shown in FIG. 7( b ), and further, the light sources Lg 1 and Lg 2 shown in FIG. 7( a ) are replaced with a light source Lr 2 and a light source Lr 3 having the same wavelength as that of the red light laser source 21 a as shown in FIG. 7( c ).
  • the light source Lb 2 is disposed in the center of projection when a region in the second volume hologram 222 where the grating 222 b is formed is expanded and projected over the entire surface of the first volume hologram 221
  • the light source Lr 2 is disposed in the center of projection when a region in the second volume hologram 222 where the grating 222 a is formed is expanded and projected over the entire surface of the first volume hologram 221 .
  • each interference exposure should be carried out with such a light intensity that a photosensitive material constituting the volume hologram is completely exposed by the three times of exposures.
  • laser lights are emitted from the red, blue, and green light laser sources 21 a ⁇ 21 c disposed on the submount 10 , and the respective laser lights irradiate the second volume hologram 222 of the diffraction part 220 .
  • the respective lights emitted from the laser light sources 21 a ⁇ 21 c are respectively diffracted and condensed by the gratings 222 a ⁇ 222 c for red light, blue light, and green light when passing through the second voltage hologram 222 .
  • the light axes of the respective lights intersect at one point on the first volume hologram 221 , and the lights irradiate the same region of the first volume hologram 221 .
  • the respective lights which are diffracted and condensed by the second volume hologram 222 are diffracted and multiplexed so as to be coaxial beams that propagate in the same optical path as shown in FIG. 5( a ) when passing through the first volume hologram 221 , and irradiate the same region of the spatial light modulation element 30 .
  • the light source device is provided with the three laser light sources 21 a ⁇ 21 c , and the diffraction part 220 comprising a volume hologram, which multiplexes the lights emitted from the laser light sources 21 a ⁇ 21 c so that these lights become coaxial beams. Therefore, it is possible to realize an ultracompact two-dimensional image display device that can be mounted on a compact apparatus such as a handy phone, as in the first embodiment.
  • the diffraction part 220 is constituted by the first and second volume holograms 221 and 222 , the lights emitted from the three laser light sources are diffracted by the second volume hologram 222 so that the light axes of these emitted lights intersect at one point on the first volume hologram 221 , and the three laser lights from the second volume hologram 222 are diffracted by the first volume hologram 221 so that these laser lights irradiate the same region of the spatial light modulation element 30 .
  • the light sources that emit lights in the vertical direction to the submount such as surface-emitting lasers, can be directly disposed on the submount 10 .
  • the construction of the light source device can be simplified, and the assembly thereof can be facilitated. This leads to a reduction in cost of the light source device.
  • the three light sources 21 a ⁇ 21 c are disposed on the same submount 10 , heat radiation of the three light sources can be carried out by radiating heat from the single submount 10 , whereby heat radiation of the light sources in the light source device can be easily carried out.
  • the second volume hologram 222 is constructed such that the boundary portions of the adjacent gratings 222 a ⁇ 222 c are slightly overlapped
  • the second volume hologram 222 may be formed such that the greater parts of the gratings for the respective lights are overlapped. In this case, the scale of the device can be reduced.
  • the second volume hologram 222 may be formed such that the gratings for the respective lights are not overlapped.
  • the scale of the light source device is somewhat increased, heat radiation of the light sources can be efficiently carried out because an interval is secured between adjacent light sources disposed on the same submount 10 .
  • the second volume hologram 222 has a lens function, it is not necessary to condense the respective lights by the second volume hologram 222 as long as the irradiation areas of the lights that pass through the second volume hologram 222 falls within the plane of the first volume hologram 221 .
  • the number of gratings to be multiply-formed onto the volume hologram can be reduced, thereby providing the device at lower cost.
  • the diffraction part 320 diffracts the incident lights and makes the light intensity distributions thereof uniform, and it is composed of a single volume hologram.
  • the volume hologram 320 is divided into plural regions. In this third embodiment, it is divided into sixteen regions.
  • the optical path of the light emitted from the blue light source 11 b is mainly illustrated to simplify the figure
  • the lights emitted from the red and green light sources 11 a and 11 c are similarly applied to the divided regions of the diffraction part 320 , and are diffracted and dispersed by the gratings that are multiply-formed on the respective divided regions, and further, irradiate the same region of the spatial light modulation element 30 .
  • a light source Lg 1 and a light source Lg 2 having the same wavelength as that of the green light laser source 11 c are used for fabrication of gratings for diffracting the light emitted from the green light laser source 11 c , as shown in FIGS. 9( a ) 9 ( d ).
  • the light sources Lg 1 and Lg 2 emit laser lights which are emitted from the same light source and divided.
  • light emitted from a single laser light source is introduced into an optical fiber, and further, the optical fiber is divided into two fibers with a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the Lg 1 and Lg 2 .
  • the light source Lg 1 is fixed at a position where the optical position with respect to the volume hologram 320 matches the position of the laser light source 11 c shown in FIGS. 8( a ) and 8 ( b ), and the position of the light source Lg 2 is changed for each divided region 32 .
  • the light sources Lg 1 and lg 2 are disposed as shown in FIGS. 9( a ) 9 ( d ), and four times of interference exposures are carried out, whereby gratings 32 c are formed in the four regions arranged in a line, among the divided sixteen regions of the volume hologram 320 .
  • the light source Lg 2 is disposed in the center of projection when each region of the volume hologram 320 is expanded and projected onto the spatial light modulation element 30 . Accordingly, the four times of interference exposures shown in FIGS.
  • gratings for diffracting the light emitted from the blue light laser source 11 b are fabricated as follows. That is, as shown in FIGS. 10( a ) ⁇ 10 ( d ), interference exposure using a light source Lb 1 and a light source Lb 2 having the same wavelength as that of the blue light laser source 11 b is carried out so that the light source Lb 1 is fixed in a position where the optical position of the light source Lb 1 with respect to the volume hologram 320 matches the position of the laser light source 11 c , and the position of the light source Lb 2 is varied for each divided region. At this time, the light sources Lb 1 and Lb 2 emit laser lights which are emitted from the same light source and divided.
  • light emitted from a single laser light source is introduced into an optical fiber, and further, the optical fiber is divided into two fibers with a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the Lb 1 and Lb 2 .
  • gratings 32 b for diffracting the emitted light from the blue light laser source are formed in four regions arranged in a line among the divided sixteen regions 32 of the volume hologram 320 by four times of interference exposures shown in FIGS. 10( a ) 10 ( d ), and gratings 32 b for diffracting the blue light are formed in all the divided sixteen regions 32 of the volume hologram 320 by performing the four times of interference exposures to the respective lines of the divided regions in the volume hologram 320 . Also in this case, during the interference exposures for the respective divided regions, regions other than the regions to be exposed should be shielded.
  • gratings for diffracting the light emitted from the red light laser source 11 a are fabricated as follows. That is, as shown in FIGS. 11( a ) ⁇ 11 ( d ), interference exposure using a light source Lr 1 and a light source Lr 2 having the same wavelength as that of the red light laser source 11 a is carried out with the light source Lr 1 being fixed in a position where the optical position of the light source Lr 1 with respect to the volume hologram 320 matches the position of the laser light source 11 a , and the position of the light source Lr 2 being varied for each divided region. At this time, the light sources Lr 1 and Lr 2 emit laser lights which are emitted from the same light source and divided.
  • light emitted from a single laser light source is introduced into an optical fiber, and further, the optical fiber is divided into two fibers with a fiber coupler, and the emission facets of the two fibers are disposed in the positions of the Lr 1 and Lr 2 .
  • gratings 32 a for diffracting the emitted light from the red light laser source are formed in four regions arranged in a line among the divided sixteen regions 32 of the volume hologram 320 , by four times of interference exposures shown in FIGS. 11( a ) ⁇ 11 ( d ), and gratings 32 a for diffracting the red light are formed in all the divided sixteen regions 32 of the volume hologram 320 by performing the four times of interference exposures to the respective lines of the divided regions. Also in this case, during the interference exposures for the respective divided regions, regions other than the regions to be exposed should be shielded.
  • the emitted lights from the laser light sources 11 a ⁇ 11 c are reflected by the prisms 12 a , 12 b , and 12 c disposed on the submount 10 , and these reflected lights irradiate the diffraction part 320 .
  • the optical axes of the respective lights emitted from the laser light sources 11 a ⁇ 11 c are matched on the diffraction part 320 , and the respective lights irradiate the same region of the diffraction part 320 .
  • the optical axes of the red, blue, and green lights that pass the respective divided regions 32 of the diffraction part 320 are matched in the respective regions 32 , and these lights are diffracted and dispersed so as to irradiate the same region, i.e., the entire surface of the spatial light modulation element 30 .
  • the spatial light modulation element 30 is irradiated with light of uniform light intensity distribution, which is obtained by multiplexing the laser lights of the respective colors.
  • the diffraction part 320 is regionally divided two-dimensionally, and the gratings for diffracting and dispersing the emitted lights from the respective light sources are multiply-formed on the respective divided regions of the diffraction part 320 so that the lights from the respective light sources, which pass through the respective regions, become coaxial beams, and irradiate the entire surface of the light irradiation region of the spatial light modulation element 30 . Therefore, it is possible to provide an ultracompact light source device that can miniaturize the optical system for converting the emitted lights from the three laser light sources into coaxial beams, and that can make the intensity distributions of the lights from the respective light sources uniform on the spatial light modulation element 30 .
  • a volume hologram can be fabricated utilizing a compact and inexpensive photosensitive material (polymer). Therefore, when the diffraction part 320 comprising a volume hologram also has the function of a light integrator as described for this third embodiment, the cost of the device can be reduced.
  • the diffraction part 320 comprises a single volume hologram
  • the diffraction part may comprise two volume holograms as described for the second embodiment.
  • the first volume hologram 221 shown in FIG. 5 is regionally divided as described for the third embodiment, whereby the intensity distributions of the lights from the respective light sources on the spatial light modulation element 30 can be made uniform as described for the third embodiment.
  • the regional division of the diffraction part is not restricted to the division into 16 regions, and it is possible to perform division into 64 regions or 128 regions, or more regions. Further, it is possible to perform the regional division of the diffraction part so that the numbers of divided regions arranged in the vertical and horizontal directions are varied according to the planar shape of the spatial light modulation element.
  • FIG. 12 is a diagram illustrating the construction of the two-dimensional image display device according to the fourth embodiment.
  • reference numeral 500 denotes a two-dimensional image display device according to the fourth embodiment, and this two-dimensional image display device 500 comprises a light source device 300 including laser light sources 11 a , 11 b , and 11 c corresponding to red light, blue light, and green light; laser driving units 550 a ⁇ 550 c for red light, blue light, and green light, which drive the respective laser light sources in the light source device 300 ; a laser switching unit 540 for selecting one of the respective laser driving units 550 a ⁇ 550 c ; a video signal switching unit 530 for selecting any of a red video signal, a blue video signal, and a green video signal which are supplied from the outside, and outputting the selected video signal to a spatial light modulation element 30 ; a control unit 520 for outputting a control signal to successively display the R, G, and B images, thereby controlling the laser switching unit 540 and the video signal switching unit 530 ; a field lens 560 for converting the respective laser
  • the laser switching unit 540 drives the red light, blue light, and green light laser driving units 550 a ⁇ 550 c according to the control signal from the control unit 520 to successively activate the red color, blue color, and green color laser light sources 11 a ⁇ 11 c.
  • the spatial light modulation element 30 Thereby, light emissions in the respective color laser sources and formations of images of the respective colors by the spatial light modulation element 30 are synchronously carried out.
  • the red light laser source 11 a emits light
  • the red video signal is supplied to the spatial light modulation element 30 and thereby modulation of the red light is carried out.
  • the blue light laser source 11 b emits light
  • the blue video signal is supplied to the spatial light modulation element 30 and thereby modulation of the blue light is carried out.
  • the green light laser source 11 c the green video signal is supplied to the spatial light modulation element 30 and thereby modulation of the green light is carried out.
  • the images formed by the modulations of the respective color lights by the spatial light modulation element 30 are projected on the screen 51 by the projection lens 510 .
  • the control unit 520 controls the light sources 11 a ⁇ 11 c so that each of these light sources emits light several times during picture display of one frame of a picture that is displayed at 30 frames per sec, whereby the pictures of the respective colors are inseparable when observed with human eyes, and therefore, the user can observe a full-color natural moving picture.
  • the light source device of the two-dimensional image display device 500 comprises the three laser light sources 11 a ⁇ 11 c , and the diffraction part 320 comprising a volume hologram, for multiplexing the lights emitted from the laser light sources 11 a ⁇ 11 c so that these lights become coaxial beams. Therefore, the optical system for converting the emitted lights from the three laser light sources into coaxial beams can be miniaturized, whereby the two-dimensional image display device can be miniaturized.
  • the light source device 300 since the light source device 300 also functions as a light integrator, the intensity distribution of light outputted from the light source device can be made uniform without using a light integrator comprising a fly-eye lens which is conventionally needed for making the light intensity distribution uniform. Therefore, the two-dimensional image display device in which the intensity distributions of the lights emitted from the light sources can be further miniaturized, and further, the number of constituents of the two-dimensional image display device can be reduced, thereby realizing a two-dimensional image display device that is easy to assemble and is reduced in cost.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Projection Apparatus (AREA)
  • Holo Graphy (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
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EP1710619A1 (en) 2006-10-11
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US8016427B2 (en) 2011-09-13
CN1914556B (zh) 2010-05-26
JP4077484B2 (ja) 2008-04-16
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KR20060129346A (ko) 2006-12-15
EP1710619A4 (en) 2010-01-06

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