WO2018146856A1 - Dispositif d'affichage d'image et système d'affichage d'image - Google Patents

Dispositif d'affichage d'image et système d'affichage d'image Download PDF

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Publication number
WO2018146856A1
WO2018146856A1 PCT/JP2017/034839 JP2017034839W WO2018146856A1 WO 2018146856 A1 WO2018146856 A1 WO 2018146856A1 JP 2017034839 W JP2017034839 W JP 2017034839W WO 2018146856 A1 WO2018146856 A1 WO 2018146856A1
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Prior art keywords
light
unit
display device
optical unit
imaging optical
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PCT/JP2017/034839
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English (en)
Japanese (ja)
Inventor
竜志 鵜飼
俊輝 中村
瀬尾　欣穂
小笠原　浩
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株式会社日立エルジーデータストレージ
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Publication of WO2018146856A1 publication Critical patent/WO2018146856A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • 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
    • G02B27/48—Laser speckle optics
    • 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
    • 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]

Definitions

  • the present invention relates to a video display device and a video display system.
  • the present invention claims the priority of Japanese Patent Application No. 2017-021855 filed on February 9, 2017.For designated countries where weaving by reference is allowed, the contents described in the application are as follows: Is incorporated into this application by reference.
  • Patent Document 1 discloses a technique related to a laser projection apparatus.
  • the laser projection apparatus 101 of the present embodiment is a laser scanning laser projection apparatus, and the diffusion unit 150 is provided in the condensing region of the emitted light from the laser light source 110.
  • the laser beam that is arranged, transmitted through the diffusion unit 150, and collimated again is scanned on the screen 201 by the scanning mechanism 140 to generate an image.
  • Patent Document 1 aims to reduce speckle, since the collimated light is projected on the screen, the resolution of the projected image may be lowered.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide a technique for efficiently displaying an image with high image quality.
  • the present application includes a plurality of means for solving at least a part of the above-described problems, and examples thereof are as follows.
  • an image display device includes a laser light source unit that emits laser light, a condensing optical unit that collects light emitted from the laser light source unit, and the collector.
  • a transmissive light diffusing unit that diffuses light from the optical optical unit, an imaging optical unit that forms an image on a projection surface using the light diffused by the light diffusing unit, and the light from the imaging optical unit
  • a scanning unit that scans on the projection surface, and the imaging optical unit determines a beam diameter on the projection surface and an effective diameter on the scanning unit as a first distance from the projection surface to the scanning unit, and Light having a diameter equal to or smaller than a value extrapolated using the second distance from the projection surface to the imaging optical unit is incident.
  • FIG. 1 is a diagram illustrating a configuration example of a video display device according to a first embodiment. It is a figure for demonstrating the light-diffusion part in the modification of 1st Embodiment. It is a figure which shows the structural example of the phase provision part in 2nd Embodiment. It is a figure which shows the structural example of the phase provision part in 3rd Embodiment. It is a figure which shows the structural example of the phase provision part in 4th Embodiment.
  • a conventional image display device using laser light In a conventional image display device using laser light, light emitted to the screen is given a phase according to the unevenness of the screen surface and is scattered. Part of the light scattered on the screen reaches the user's retina. Since the laser has coherence, the light reaching the user's retina may be strengthened or weakened depending on the phase applied by the screen.
  • speckle a random speckle pattern called speckle on the screen.
  • speckles are superimposed on the image projected on the screen, the image quality visually recognized by the user is reduced.
  • FIG. 1 is a diagram illustrating a configuration example of a video display system 1 according to the first embodiment.
  • the video display system 1 includes a video display device 2 and a screen 3.
  • the video display device 2 is a device that scans a laser beam and displays the video image 11 on the screen 3 that is a projection surface.
  • the video display device 2 includes a laser light source unit 100, a phase applying unit 110, and a scanning unit 120. Although details will be described later, the laser light source unit 100 emits visible light for displaying the video 11 to the user.
  • the phase applying unit 110 adds a phase to the light incident from the laser light source unit 100 and emits the light to the scanning unit 120.
  • the scanning unit 120 scans the image 11 on the projection plane using the scanning element 121.
  • the scanning element 121 includes a mirror surface, reflects the laser light incident from the phase applying unit 110 using the mirror surface, and scans the screen 3.
  • the mirror surface rotates about, for example, two axes, and scans the laser beam on the screen 3. More specifically, the mirror surface has a first rotation axis that scans the laser light on the screen 3 in the y direction (vertical direction) shown in FIG. 1, and the x direction (horizontal direction) that shows the laser light in FIG. Rotate around a second rotation axis that scans at the same time.
  • the first rotation axis and the second rotation axis are orthogonal to each other.
  • the image display device 2 in the present embodiment drives the image on the screen 3 by driving in synchronization with the rotation of the mirror surface by the first rotation axis and the second rotation axis and the output intensity by the laser light source unit 100. 11 can be displayed.
  • the scanning unit 120 shown in FIG. 1 includes one scanning element 121, the present invention is not limited to this.
  • the scanning unit 120 may include two scanning elements 121 each having a mirror surface. Each scanning element 121 rotates with a different rotation axis. The scanning unit 120 only needs to scan the laser light in the x direction and the y direction on the screen 3 by the rotation of each scanning element 121.
  • the screen 3 may be one that vibrates or rotates during video display.
  • the screen 3 vibrates in the horizontal direction (x direction) or the vertical direction (y direction) by a drive mechanism (not shown).
  • a drive mechanism not shown.
  • the screen 3 at a certain point in time is used as a reference plane, it rotates in parallel with the reference plane with the normal line of the reference plane as the central axis.
  • the speckle pattern visually recognized by the user changes dynamically. That is, it is possible to obtain an effect of reducing the speckle pattern by time integration of the speckle pattern.
  • FIG. 2 is a diagram illustrating a configuration example of the laser light source unit 100 according to the first embodiment.
  • the laser light source unit 100 includes laser light sources 101a, 101b, and 101c and dichroic mirrors 102a and 102b.
  • laser light sources 101 when it is not necessary to distinguish the laser light sources 101a, 101b, and 101c, they are referred to as laser light sources 101.
  • the laser light sources 101a, 101b, and 101c are, for example, laser diodes, and emit laser beams of different colors.
  • the laser light source 101a emits “R (red)” laser light
  • the laser light source 101b emits “G (green)” laser light
  • the laser light source 101c emits “blue” laser light.
  • the dichroic mirrors 102a and 102b multiplex the light emitted from the laser light source 101.
  • the laser light source 101 and the dichroic mirrors 102a and 102b are arranged so that the three colors of laser light travel in substantially the same direction with substantially the same optical axis.
  • the number of laser light sources 101 included in the laser light source unit 100 is not limited to this.
  • the laser light source unit 100 may project the image 11 on the screen 3 using one or two laser light sources 101.
  • the laser light source unit 100 may use a plurality of laser light sources 101 for each color to increase the light output intensity.
  • FIG. 3 is a diagram illustrating a configuration example of the phase applying unit 110 according to the first embodiment.
  • the phase imparting unit 110 includes a condensing optical unit 130, a light diffusing unit 140, and an imaging optical unit 150.
  • the condensing optical unit 130 includes a condensing lens 131.
  • the condensing optical unit 130 condenses the light emitted from the laser light source unit 100 on the light diffusion unit 140 using the condensing lens 131.
  • the light diffusing unit 140 includes at least one transmissive diffusing member 141 and diffuses incident light.
  • the transmissive diffusing member 141 is, for example, a transmissive diffusing plate that does not substantially disturb the polarization of incident light.
  • the transmission type diffusing member 141 has a substantially single polarization of the transmitted light when a single polarized light is incident.
  • the transmission type diffusion member 141 is, for example, a transmission type surface diffusion plate.
  • the transmission type diffusion member 141 may be, for example, a transmission type diffraction grating.
  • a specific pattern is repeatedly arranged on the transmission diffraction grating.
  • the light incident on the transmissive diffraction grating spreads by diffraction and is emitted toward the imaging optical unit 150.
  • a grating-shaped pattern is arranged in the transmission type diffraction grating. By optimizing the grating shape, the light diffusion unit 140 can obtain a desired diffraction pattern and a desired diffraction intensity distribution.
  • the transmission type diffusion member 141 may be plural, for example. In that case, each transmission type diffusing member 141 is installed in the light diffusing unit 140 in multiple stages. The light incident on the light diffusing unit 140 is diffused as it passes through the transmissive diffusing member 141, and is emitted toward the imaging optical unit 150. Thereby, the selectivity of the diffusing member is increased, and the light distribution of the transmitted light can be set to a desired distribution.
  • the imaging optical unit 150 forms an image on the projection plane using the light diffused by the light diffusion unit 140.
  • the imaging optical unit 150 includes a lens 151.
  • the lens 151 is preferably composed of an optical system or an optical component having good light collecting performance.
  • the lens 151 is, for example, a plano-convex lens in which the light diffusion unit 140 side is flat, a meniscus lens in which the light diffusion unit 140 side is concave, or an aspheric lens.
  • the light reaching the phase applying unit 110 from the laser light source unit 100 is incident on the condensing optical unit 130.
  • the profile of light incident on the condensing optical unit 130 may be collimated light, diffused light, or convergent light.
  • the condensing optical unit 130 emits the incident light to the light diffusion unit 140.
  • the installation position of the light diffusing unit 140 is within a range where the light emitted from the condensing optical unit 130 is condensed.
  • the range in which light is condensed is, for example, a range in which the radius of light is less than or equal to ⁇ 2 times the beam waist radius. This range coincides with a range whose length is twice the Rayleigh length with the beam waist position as the center.
  • the light diffusion unit 140 diffuses the light incident from the condensing optical unit 130 and emits it to the imaging optical unit 150.
  • the imaging optical unit 150 stops the incident diffused light and emits it to the scanning unit 120.
  • the scanning unit 120 scans the light emitted from the imaging optical unit 150 onto the screen 3 that is a projection surface.
  • the transmission type diffusing member 141 provided in the light diffusing unit 140 in the present embodiment does not substantially disturb the polarization. Therefore, the laser light source unit 100 emits laser light having substantially single polarized light, and the condensing optical unit 130, the imaging optical unit 150, and the scanning unit 120 are configured to substantially maintain polarized light.
  • the video display device 2 can output light of substantially single polarized light.
  • the radius of the diffused light at a position away from the light diffusing unit 140 by the distance L is L ⁇ tan ⁇ .
  • the light diffused by the light diffusing unit 140 is collected on the screen 3 by the imaging optical unit 150, but the effective radius of the scanning unit 120 positioned between the imaging optical unit 150 and the screen 3 must be taken into consideration.
  • the light emitted from the imaging optical unit 150 protrudes from the effective radius of the scanning unit 120, leading to a decrease in light utilization efficiency.
  • the imaging optical unit 150 generates an image of the object surface on the screen 3 with the light diffusing unit 140 as an object surface and the screen 3 as an image surface.
  • the beam diameter in the light diffusing unit 140 and the imaging optical system If the optical magnification is not taken into consideration, the beam radius on the screen 3 becomes large, and the resolution of the image 11 is lowered. Further, the image 11 with good image quality cannot be displayed unless the beam diameter in the light diffusing unit 140 and the pattern interval of the light diffusing unit 140 are taken into consideration.
  • each component of the phase adding unit 110 is adjusted in order to efficiently display an image with good image quality.
  • the installation conditions of each component of the phase provision part 110 are demonstrated.
  • FIG. 4 is a diagram for explaining the installation conditions of the light diffusing unit 140, the imaging optical unit 150, the scanning unit 120, and the screen 3.
  • the radius of light on the exit side of the light diffusing unit 140 is h
  • the radius of the imaging optical unit 150 is R
  • the effective radius of the scanning unit 120 is r
  • the spread angle of the light diffused by the light diffusing unit 140 is a half angle ⁇ .
  • the radius of the imaging optical unit 150 is synonymous with the radius of the lens 151, for example.
  • the distance between the light diffusing unit 140 and the imaging optical unit 150 is a
  • the distance between the imaging optical unit 150 and the screen 3 is b
  • the distance between the scanning unit 120 and the screen 3 is c.
  • the distance c between the scanning unit 120 and the screen 3 is substantially equal to the projection distance of the video display device 2.
  • the light diffused by the light diffusion unit 140 enters the imaging optical unit 150 and is emitted toward the scanning unit 120.
  • the light emitted from the imaging optical unit 150 is scanned by the scanning unit 120 and reaches the screen 3.
  • the phase applying unit 110 generates an image of the object surface on the screen 3 with the light diffusion unit 140 as the object surface.
  • the imaging optical unit 150 is preferably composed of an optical component having a high numerical aperture (NA) in order to capture more light diffused by the light diffusion unit 140.
  • NA numerical aperture
  • the imaging optical unit 150 may have a numerical aperture of approximately sin ⁇ or more. Thereby, the light emitted from the light diffusing unit 140 can be prevented from leaking out of the imaging optical unit 150.
  • the spread angle ⁇ is an angle corresponding to the minimum solid angle capable of capturing a predetermined proportion of the light energy emitted from the light diffusing unit 140. For example, if the predetermined ratio is 1 ⁇ 2, the angle at which 1 ⁇ 2 of the energy of the light emitted from the light diffusing unit 140 can be captured is set to ⁇ , so that the imaging optical unit 150 is moved outside. The leaking light can be suppressed to 1 ⁇ 2 or less.
  • n m / (k ⁇ L) when resolving each k pixel of the image 11.
  • n m / (k ⁇ L) when resolving each k pixel of the image 11.
  • the video display device 2 has the following configuration. Specifically, the imaging optical unit 150 determines the beam diameter on the screen, which is the projection surface, and the effective diameter in the scanning unit 120, the distance from the projection surface to the scanning unit 120, and the distance from the projection surface to the imaging optical unit 150. It is comprised so that the light of the diameter below the value extrapolated using may be incident.
  • the radius R of the light incident on the imaging optical unit 150 satisfies the following condition.
  • the radius h of the light emitted from the light diffusing unit 140 is H in order to set the radius of light on the screen 3 to H.
  • the video display device 2 is configured so as to be approximately equal to or less than a value obtained by dividing by the optical magnification (b / a).
  • the video display device 2 is configured to satisfy the following conditions.
  • the representative length of the diffusion pattern of the light diffusion unit 140 is defined as the correlation length of the phase pattern imparted to the light by the light diffusion unit 140.
  • the light diffusion unit 140 is configured such that the representative length is equal to or less than the light radius h in the light diffusion unit 140.
  • the laser light source unit 100 and the condensing optical unit 130 are configured such that the radius of light on the emission side from the light diffusion unit 140 is h. Therefore, the laser light source unit 100 may include an optical component such as a lens or a curved mirror (not shown).
  • FIG. 5 is a diagram illustrating a configuration example of the video display device 2 according to the first embodiment.
  • the optical magnification (b / a) is increased. Therefore, the light radius h in the light diffusion unit 140 is smaller than the light radius H on the screen 3.
  • the effective radius r of the scanning unit 120 is smaller than that in the configuration example 1, so the light radius R in the imaging optical unit 150 is made smaller than that in the configuration example 1. Therefore, in the configuration example 2, the distance a from the light diffusing unit 140 to the imaging optical unit 150 is configured to be smaller than that in the configuration example 1. That is, the optical magnification (b / a) of Configuration Example 2 is larger than that of Configuration Example 1. For this reason, the light radius h in the light diffusing unit 140 is configured to be smaller than that in the first configuration example.
  • the light diffused by the light diffusing unit 140 reaches the screen 3 while suppressing leakage from the effective radii of the imaging optical unit 150 and the scanning unit 120. Therefore, the light use efficiency is improved. Further, since the diffused light can be narrowed down, it is possible to display the high-quality video 11 on the screen 3.
  • the light emitted from the laser light source unit 100 is given a phase by the phase applying unit 110 and is scanned on the screen 3 by the scanning unit 120. Therefore, speckles with respect to the image 11 displayed on the screen 3 can be reduced.
  • FIG. 6 is a diagram for explaining a light diffusing unit 140 in a modification of the first embodiment.
  • the light diffusing unit 140 in the modification is configured to disturb the polarization.
  • FIG. 6A is a diagram illustrating an example of the light diffusion unit 140 according to the modification.
  • the light diffusing unit 140 includes a transmissive diffusion plate 142 that disturbs polarization in place of the transmissive diffusing member 141 or in addition to the transmissive diffusing member 141.
  • the diffusion plate 142 is, for example, a transmission type volume diffusion plate.
  • the diffusion plate 142 has the property of diffusing the incident light and randomizing the polarization of the diffused light even when a single polarized light is incident.
  • this is a case where the laser light source unit 100 outputs light having substantially single polarized light, and the condensing optical unit 130, the imaging optical unit 150, and the scanning unit 120 are configured to substantially maintain polarized light.
  • the diffusion plate 142 the polarization of the light output from the video display device 2 is not single. Thereby, the speckle reduction effect by multiplexing of polarized light can be obtained.
  • FIG. 6B is a diagram illustrating another example of the light diffusing unit 140 according to the modification.
  • the light diffusing unit 140 includes a transmissive composite wavelength plate 143 instead of the transmissive diffusing member 141 or in addition to the transmissive diffusing member 141.
  • the composite wave plate 143 is a wave plate in which a plurality of wave plates having different polarization axes are arranged two-dimensionally (on the same plane).
  • FIG. 6C is a diagram for explaining polarization by the composite wave plate 143.
  • the composite wave plate 143 as shown in FIG. 6C, two types of wave plates whose polarization axes are shifted by 45 degrees are arranged in a lattice shape. Since a plurality of wave plates having different polarization axes are arranged two-dimensionally, light is diffracted and spread and output. Thereby, the composite wave plate 143 exhibits a function of diffusing light.
  • FIG. 7 is a diagram illustrating a configuration example of the phase applying unit 110 according to the second embodiment.
  • the phase applying unit 110 according to the second embodiment is partially common to the phase applying unit 110 according to the first embodiment, and is partially different.
  • the phase applying unit 110 in the second embodiment includes a light diffusion unit driving unit 200.
  • the phase applying unit 110 in the second embodiment includes a movable light diffusing unit 140 ⁇ / b> A instead of the light diffusing unit 140.
  • the light diffusion unit driver 200 drives the movable light diffusion unit 140A.
  • the light diffusion unit driving unit 200 includes a driving element (not shown) such as a motor, and drives the movable light diffusion unit 140A.
  • the light diffusion unit driver 200 vibrates or rotates the movable light diffusion unit 140A, for example.
  • the movable light diffusing unit 140A includes a transmissive diffusing member 141, similarly to the diffusing unit in the first embodiment.
  • the transmissive diffusing member 141 may not disturb the polarization of incident light, or may disturb the polarization.
  • the movable light diffusing unit 140 ⁇ / b> A differs from the light diffusing unit 140 only in that it is driven by the light diffusing unit driving unit 200.
  • the driving of the movable light diffusing unit 140A is preferably performed in a plane substantially perpendicular to the light incident on the movable light diffusing unit 140A.
  • the movable light diffusing unit 140A is preferably driven vertically and horizontally while maintaining a state perpendicular to the incident light, that is, with the incident light being a normal line.
  • the movable light diffusing unit 140A rotates about a line parallel to the incident light as a central axis.
  • the light passing through the movable light diffusing unit 140A while maintaining the distance from the condensing optical unit 130 to the movable light diffusing unit 140A and the distance from the movable light diffusing unit 140A to the imaging optical unit 150 It is possible to provide a phase that changes with time.
  • maintaining the distance from the condensing optical unit 130 to the movable light diffusing unit 140A and the distance from the movable light diffusing unit 140A to the imaging optical unit 150 can maintain the resolution of the image 11 to be displayed. Means you can.
  • the driving frequency of the movable light diffusing unit 140A is preferably configured so as not to be approximately an integral multiple or approximately an integral multiple of the scanning frequency in the y direction shown in FIG. Thereby, it is possible to make it difficult to visually recognize the disturbance of the image 11 such as brightness unevenness due to the beat of the drive of the movable light diffusing unit 140A and the light scanning by the scanning unit 120.
  • the movable light diffusing unit 140A is the same as the first embodiment in that it may include a plurality of transmission type diffusing members 141.
  • the light diffusion unit driving unit 200 may drive one transmission type diffusion member 141 or may drive a plurality of transmission type diffusion members 141. Further, when driving a plurality of transmission type diffusing members 141, if the driving phases and loci are driven differently, the driving amplitude and frequency can be reduced.
  • a time-varying phase can be imparted to the light passing through the movable light diffusing unit 140A.
  • FIG. 8 is a diagram illustrating a configuration example of the phase applying unit 110 according to the third embodiment.
  • the phase applying unit 110 according to the third embodiment is partially shared by the phase applying unit 110 according to the first and second embodiments, and is partially different.
  • differences from the first and second embodiments will be described.
  • the phase applying unit 110 in the third embodiment includes a light branching unit 210, an objective optical unit 220, a light diffusing unit 230, and an imaging optical unit 240.
  • the light branching unit 210 separates an optical path that travels from the laser light source unit 100 toward a light diffusing unit 230 described later and an optical path that travels from the light diffusing unit 230 toward the screen 3.
  • the light branching unit 210 branches light by, for example, the polarization of incident light.
  • the light branching unit 210 branches the light incident from the light diffusing unit 230 via the objective optical unit 220 and guides it to the imaging optical unit 240 described later.
  • the light branching unit 210 includes a polarization branching element 211 and a ⁇ / 4 wavelength plate 213.
  • the polarization branching element 211 has a surface 212 that allows light of predetermined polarization to pass therethrough and reflects light of polarization different from the predetermined polarization.
  • the polarization branching element 211 is, for example, a polarization beam splitter.
  • the surface 212 of the polarization splitting element 211 transmits, for example, P-polarized light and reflects S-polarized light.
  • the ⁇ / 4 wavelength plate 213 converts linearly polarized light and circularly polarized light into each other.
  • the polarization splitting element 211 includes a first surface 211a positioned on the laser light source unit 100 side, a second surface 211b facing the first surface 211a and positioned on the objective optical unit 220 side, a first surface 211a, and It has the 3rd surface 211c orthogonal to the 2nd surface 211b.
  • the objective optical unit 220 collects the light incident from the light branching unit 210.
  • the objective optical unit 220 guides light incident from the light diffusion unit 230 described later to the light branching unit 210.
  • the main axis is parallel to the normal line of the light diffusion unit 230, and the optical axis of the light incident from the light branching unit 210 is substantially equal to the main axis.
  • the objective optical unit 220 emits substantially parallel light (collimated light) when the light incident from the light diffusing unit 230 is emitted to the light branching unit 210.
  • the light diffusion unit 230 includes at least one reflective diffusion member 231 and diffuses incident light.
  • the reflective diffusion member 231 is, for example, a reflective diffusion plate that does not substantially disturb the polarization of incident light.
  • the reflection-type diffusing member 231 has a substantially single polarization of the reflected light when light of a single polarization is incident. For example, when clockwise circularly polarized light is incident on the reflective diffusing member 231, the polarized light of the reflected light becomes substantially counterclockwise circularly polarized light.
  • the reflection type diffusion member 231 provided in the light diffusion unit 230 is a reflection type surface diffusion plate or a reflection type diffraction element.
  • the light diffusing unit 230 may include a plurality of reflective diffusion members 231. The installation position of the light diffusing unit 230 is within a range where light emitted from the objective optical unit 220 is condensed.
  • the imaging optical unit 240 forms an image on the screen 3 using the light diffused by the light diffusion unit 230.
  • the imaging optical unit 240 includes a lens 241 that receives the light branched by the light branching unit 210.
  • the laser light source unit 100 emits substantially single polarized light. In the following description, it is assumed that the laser light source unit 100 emits substantially P-polarized light only.
  • the light emitted from the laser light source unit 100 reaches the phase applying unit 110 and enters the first surface 211 a of the polarization branching element 211 included in the light branching unit 210.
  • the surface 212 of the polarization splitting element 211 transmits P-polarized light and reflects S-polarized light.
  • the light incident on the polarization branching element 211 from the laser light source unit 100 is substantially P-polarized light, it passes through the surface 212 and is emitted from the second surface 211b of the polarization branching element 211.
  • the emitted light is incident on the ⁇ / 4 wavelength plate 213.
  • the ⁇ / 4 wavelength plate 213 converts substantially incident P-polarized light into circularly-polarized light.
  • the ⁇ / 4 wavelength plate 213 emits, for example, substantially clockwise circularly polarized light to the objective optical unit 220 from a surface opposite to the incident surface.
  • the emitted light is condensed on the light diffusion unit 230 by the objective optical unit 220.
  • the light diffusion unit 230 diffuses and emits the incident light. Since substantially clockwise circularly polarized light is incident on the light diffusing unit 230, the light diffusing unit 230 emits substantially counterclockwise circularly polarized light.
  • the objective optical unit 220 receives light from the light diffusion unit 230.
  • the objective optical unit 220 is preferably composed of an optical component having a high numerical aperture in order to capture more light diffused by the light diffusing unit 230, like the imaging optical unit 150 in the first embodiment.
  • the objective optical unit 220 preferably has a numerical aperture of approximately sin ⁇ or more, where ⁇ is the half angle of the spread angle of the light diffused by the light diffusion unit 230. Thereby, it can suppress that the light radiate
  • the objective optical unit 220 is preferably composed of an optical system or an optical component having good light collecting performance in order to generate a high-quality image 11 on the screen 3.
  • the lens 221 used in the objective optical unit 220 is a plano-convex lens in which the light diffusion unit 230 side is flat, a meniscus lens in which the light diffusion unit 230 side is concave, or an aspheric lens.
  • the light emitted from the objective optical unit 220 reaches the phase applying unit 110 and enters the ⁇ / 4 wavelength plate 213. Since the objective optical unit 220 maintains polarization, the polarization of light incident on the ⁇ / 4 wavelength plate 213 is substantially counterclockwise circularly polarized light emitted from the light diffusion unit 230.
  • the ⁇ / 4 wavelength plate 213 converts the incident substantially left-handed circularly polarized light into linearly polarized light, for example, substantially S-polarized light, and emits it.
  • the polarization splitting element 211 enters the light emitted from the ⁇ / 4 wavelength plate 213. Since the incident light is substantially S-polarized light, it is reflected by the surface 212 and is emitted from the third surface 211c perpendicular to the second surface 211b. In other words, the polarization branching element 211 branches the light incident from the ⁇ / 4 wavelength plate 213 and guides it to the imaging optical unit 240. The light emitted from the polarization splitting element 211 enters the imaging optical unit 240 and is emitted from the imaging optical unit 240 to the scanning unit 120. The imaging optical unit 240 forms an image on the screen 3 using the emitted light.
  • the installation conditions of the video display apparatus 2 in the present embodiment will be described with reference to FIG. 4 because the installation conditions are partially in common with the video display apparatus 2 in the first embodiment.
  • the light emitted from the laser light source unit 100 is condensed on the light diffusion unit 230 by the objective optical unit 220. This is similar to the point that the light emitted from the laser light source unit 100 is condensed on the light diffusion unit 230 by the condensing optical unit 130 in the first embodiment.
  • the objective optical unit 220 and the imaging optical unit 240 generate an image of the object surface on the screen 3 with the light diffusion unit 230 as the object surface.
  • this corresponds to the imaging optical unit 240 generating an image of the object surface on the screen 3 with the light diffusing unit 230 as the object surface.
  • the optical element that is defined by the optical elements that constitute the objective optical unit 220 and the imaging optical unit 240 and the optical distance between them is defined as a composite imaging optical unit 150A. That is, the composite imaging optical unit 150 ⁇ / b> A includes the objective optical unit 220 and the imaging optical unit 240.
  • FIG. 4 shows an optical system in which the composite imaging optical unit 150A generates an image of the object surface on the screen 3 with the light diffusion unit 230 as the object surface.
  • a is a distance from the light diffusing unit 230 to the front plane (light diffusing unit 230 side) main plane of the composite imaging optical unit 150A
  • b is a main side on the rear side (scanning unit 120 side) of the composite imaging optical unit 150A.
  • a distance from the plane to the screen 3, R is a radius of light of the composite imaging optical unit 150A when the objective optical unit 220 and the imaging optical unit 240 are replaced with the composite imaging optical unit 150A.
  • the composite imaging optical unit 150A is configured to receive light having a diameter equal to or smaller than a value obtained by extrapolating the beam diameter on the screen 3 serving as a projection surface and the effective radius in the scanning unit 120 using the distance c and the distance b. The That is, the light radius H on the screen 3 and the effective radius r on the scanning unit 120 are extrapolated using the distance c from the screen to the scanning unit 120 and the distance b from the screen to the main plane of the composite imaging optical unit 150A.
  • Light having a radius equal to or smaller than the value is incident on the composite imaging optical unit 150A. In other words, the radius R of the light incident on the composite imaging optical unit 150A satisfies the following condition.
  • the radius h of the light emitted from the light diffusing unit 230 is obtained by dividing H by the optical magnification (b / a).
  • the video display device 2 is configured to be substantially equal to or less than the value.
  • the spread angle of the light diffused by the light diffusing unit 230 is a half angle ⁇ , and the light in the composite image forming optical unit 150A when the light diffused by the light diffusing unit 230 reaches the composite image forming optical unit 150A.
  • the radius R can be expressed as h + a ⁇ tan ⁇ . Therefore, the video display device 2 is configured to satisfy the following conditions.
  • the laser light source unit 100 and the condensing optical unit 130 are configured such that the radius of the light on the emission side from the light diffusion unit 230 is h. Therefore, the laser light source unit 100 may include an optical component such as a lens or a curved mirror (not shown).
  • the video display device 2 that has high light use efficiency and high image quality due to speckle reduction.
  • the video display device 2 can be reduced in size.
  • the objective optical unit 220 collects light and enters the diffused light into the light diffusing unit 230, the installation difficulty level can be reduced as compared with the case where many optical components are used.
  • the objective optical unit 220 emits substantially parallel light to the light branching unit 210, and the light branching unit 210 guides the substantially parallel light to the imaging optical unit 240.
  • the image optical unit 150A can be configured, which can contribute to a reduction in installation difficulty.
  • FIG. 9 is a diagram illustrating a configuration example of the phase applying unit 110 according to the fourth embodiment.
  • the phase adding unit 110 has optical axes in which incident light to the light diffusing unit 230 and outgoing light from the light diffusing unit 230 are different.
  • the light branching unit 210 includes a reflection mirror 214 in place of the polarization branching element 211 and the ⁇ / 4 wavelength plate 213 in the third embodiment.
  • the reflection mirror 214 reflects either one of the light incident from the laser light source unit 100 and the light incident from the objective optical unit 220. When reflecting the light incident from the objective optical unit 220, the reflection mirror 214 guides the reflected light to the imaging optical unit 240.
  • the objective optical unit 220 includes a lens 221, and the optical axis of light incident on the objective optical unit 220 from the laser light source unit 100 via the light branching unit 210 is different from the main axis of the lens 221. .
  • the optical axis of the light incident on the objective optical unit 220 from the laser light source unit 100, the main axis of the lens 221, and the normal line of the reflective diffusion member 231 included in the light diffusion unit 230 are preferably parallel.
  • the phase adding unit 110 in the fourth embodiment includes an optical axis of light incident on the objective optical unit 220 from the laser light source unit 100 and an optical axis of light incident on the optical branching unit 210 from the objective optical unit 220. It is comprised so that the position may differ.
  • the light emitted from the laser light source unit 100 passes through the light branching unit 210 and enters the objective optical unit 220.
  • the light emitted from the objective optical unit 220 is reflected by the light diffusing unit 230, diffuses, and enters the objective optical unit 220 again.
  • the light emitted from the objective optical unit 220 is reflected by the reflection mirror 214, enters the scanning unit 120, and scans on the screen 3.
  • the light diffusing unit 230 may include a reflective diffusing device that does not substantially disturb polarized light, or may include a reflective diffusing member 231 that disturbs polarized light. By using the light diffusing unit 230 including the reflective diffusing member 231 that disturbs the polarized light, it is possible to obtain a speckle reduction effect by multiplexing the polarized light.
  • the present embodiment is not limited to this.
  • the light emitted from the laser light source unit 100 to the phase applying unit 110 may be reflected by the reflection mirror 214 and incident on the objective optical unit 220. Thereafter, the light emitted from the objective optical unit 220 is reflected by the light diffusing unit 230, reenters the objective optical unit 220, and then enters the imaging optical unit 240 without being reflected by the reflection mirror 214. May be.
  • the light branching unit 210 may include a plurality of reflecting mirrors 214 and reflect each of the light emitted from the laser light source unit and the light emitted from the objective optical unit 220.
  • the video display device 2 can be further simplified as compared with the case where the polarization splitting element 211 and the wave plate are used.
  • the video display device 2 that displays the high-quality video 11 can be provided by the speckle reduction effect by the light diffusion unit 230.
  • the light utilization efficiency can be improved by appropriately installing the composite imaging optical unit 150A.
  • the configuration of the video display device described above can be classified into more components depending on the processing content. Moreover, it can also classify

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention a pour objet de fournir une technique d'affichage efficace d'une image de haute qualité. Un dispositif d'affichage d'image de la présente invention est caractérisé en ce qu'il comprend : une partie source de lumière laser (100) servant à émettre une lumière laser ; une partie optique de collecte de lumière (130) servant à collecter la lumière laser émise à partir de la partie source de lumière laser ; une partie de diffusion de lumière (140) qui est un type transmissif et diffuse la lumière à partir de la partie optique de collecte de lumière ; une partie optique de formation d'image (150) qui forme une image sur un plan de projection (3) à l'aide de la lumière qui est diffusée par la partie de diffusion de lumière ; et une partie de balayage (120) qui balaie le plan de projection à l'aide de la lumière provenant de la partie optique de formation d'image, la lumière incidente sur la partie optique de formation d'image (150) ayant un rayon égal ou inférieur à une valeur extrapolée à partir d'un diamètre de faisceau dans le plan de projection (3) et un rayon effectif dans la partie de balayage (120) à l'aide d'une première distance du plan de projection à la partie de balayage et d'une seconde distance du plan de projection à la partie optique de formation d'image.
PCT/JP2017/034839 2017-02-09 2017-09-27 Dispositif d'affichage d'image et système d'affichage d'image WO2018146856A1 (fr)

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JP2017-021855 2017-02-09

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WO2005062114A1 (fr) * 2003-12-24 2005-07-07 Matsushita Electric Industrial Co., Ltd. Dispositif d'affichage d'images en deux dimensions
WO2005083492A1 (fr) * 2004-02-27 2005-09-09 Matsushita Electric Industrial Co., Ltd. Source de lumiere eclairante et affichage d’image bidimensionnelle l’utilisant
JP3137219U (ja) * 2007-09-05 2007-11-15 一品光学工業股▲ふん▼有限公司 Ｍｅｍｓ振動レーザスキャナ
US20080297731A1 (en) * 2007-06-01 2008-12-04 Microvision, Inc. Apparent speckle reduction apparatus and method for mems laser projection system
WO2009035041A1 (fr) * 2007-09-13 2009-03-19 Nec Corporation Dispositif d'affichage d'image, procédé d'affichage d'image et programme de calcul de direction
JP2011002547A (ja) * 2009-06-17 2011-01-06 Konica Minolta Opto Inc レーザ投射装置
JP2013533502A (ja) * 2010-05-21 2013-08-22 コーニング インコーポレイテッド 拡散性表面を用いてスペックルを低減するためのシステム及び方法

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CN102520570B (zh) * 2011-12-04 2015-05-27 深圳市光峰光电技术有限公司 发光装置及其应用的投影系统
JP5910554B2 (ja) * 2013-03-22 2016-04-27 ソニー株式会社 光源装置および表示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06208089A (ja) * 1992-07-29 1994-07-26 Texas Instr Inc <Ti> コヒーレント光を用いる無スペックル・ディスプレイ装置
WO2005062114A1 (fr) * 2003-12-24 2005-07-07 Matsushita Electric Industrial Co., Ltd. Dispositif d'affichage d'images en deux dimensions
WO2005083492A1 (fr) * 2004-02-27 2005-09-09 Matsushita Electric Industrial Co., Ltd. Source de lumiere eclairante et affichage d’image bidimensionnelle l’utilisant
US20080297731A1 (en) * 2007-06-01 2008-12-04 Microvision, Inc. Apparent speckle reduction apparatus and method for mems laser projection system
JP3137219U (ja) * 2007-09-05 2007-11-15 一品光学工業股▲ふん▼有限公司 Ｍｅｍｓ振動レーザスキャナ
WO2009035041A1 (fr) * 2007-09-13 2009-03-19 Nec Corporation Dispositif d'affichage d'image, procédé d'affichage d'image et programme de calcul de direction
JP2011002547A (ja) * 2009-06-17 2011-01-06 Konica Minolta Opto Inc レーザ投射装置
JP2013533502A (ja) * 2010-05-21 2013-08-22 コーニング インコーポレイテッド 拡散性表面を用いてスペックルを低減するためのシステム及び方法

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