WO2019201020A1 - Dispositif et procédé de modulation de polarisation de lumière de projection stéréoscopique, et système de projection d'image stéréoscopique - Google Patents

Dispositif et procédé de modulation de polarisation de lumière de projection stéréoscopique, et système de projection d'image stéréoscopique Download PDF

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Publication number
WO2019201020A1
WO2019201020A1 PCT/CN2019/076800 CN2019076800W WO2019201020A1 WO 2019201020 A1 WO2019201020 A1 WO 2019201020A1 CN 2019076800 W CN2019076800 W CN 2019076800W WO 2019201020 A1 WO2019201020 A1 WO 2019201020A1
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WIPO (PCT)
Prior art keywords
polarization
reflected
transmitted
polarization state
light
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PCT/CN2019/076800
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English (en)
Chinese (zh)
Inventor
邓树端
帕尔默·斯蒂芬·约翰
周永业
Original Assignee
深圳市时代华影科技股份有限公司
Volfoni 研发公司
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Publication of WO2019201020A1 publication Critical patent/WO2019201020A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
    • 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
    • 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
    • G03B21/28—Reflectors in projection beam
    • 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
    • H04N9/3167—Modulator illumination systems for polarizing the light beam

Definitions

  • the invention belongs to the field of projection display technology, and in particular relates to a polarization modulation device and method for stereoscopic projection light and a stereoscopic image projection system.
  • the principle of viewing stereoscopic images is that the left and right eye video images are played by the left and right eyes of the person, and the left and right eye video images are synthesized by the brain to produce a stereoscopic effect.
  • the left and right eye receiving images mainly include left and right polarization splitting modes, left and right shutter switch synchronization modes, and left and right red and blue splitting modes, among which the left and right polarization splitting modes are more widely used.
  • the left and right polarization splitting mode a single optical path polarization splitting technique and a dual optical path polarization splitting technique are successively generated according to the development track of the technology.
  • FIG. 1 A typical single-lens polarization splitting principle is shown in FIG. 1.
  • the projector 11 sequentially projects a projection beam carrying a left-eye image and a projection beam carrying a right-eye image in a frame order, and the projection beam is performed by the polarizing plate 12.
  • the polarized light is converted into linearly polarized light, and then the left-hand circularly polarized light and the right-handed circularly polarized light are modulated by the polarization modulator 13 according to the frame order, and projected onto the screen 15, and the left and right eyes of the viewer are respectively received by the circular polarized glasses 16 worn.
  • the synchronization circuit 14 is used to control the projector 11 and the polarization modulator 13 to operate in synchronization.
  • the polarizing plate 12 is of an absorption type, only part of the light energy is polarized during the polarizing process and another part of the light energy is discarded, so that a large amount of light energy is converted into heat on the polarizing plate 12, and a high-brightness movie is used.
  • the temperature of the polarizing plate 12 rises rapidly, so that the aging speed of the polarizing plate 12 is accelerated, and the optical performance is remarkably deteriorated. In severe cases, the strong light beam burns the polarizing plate 12. Therefore, the single-path polarization splitting is later replaced by the dual-path polarization splitting.
  • FIG. 2 is mainly realized by a slanting plate type prism, which has an obliquely disposed polarization beam splitting film 2, and the projection beam from the projector is split into a transmission by the polarization beam splitting film.
  • P-polarized light and reflected S-polarized light then convert P-polarized light into S-polarized light or convert S-polarized light into P-polarized light, and finally uniformly modulate the two beams into left-handed circularly polarized light or Right-handed circularly polarized light. Since the projected light is fully utilized during the polarizing process, the utilization of the projected light and the brightness of the projected picture are also improved.
  • the modulation system using the dual optical path polarization splitting will be larger in size, and the required optical components are also larger, which has many difficulties in processing and assembling the device.
  • the main purpose of the embodiments of the present invention is to provide a polarization modulation device, a method, and a stereoscopic image projection system for stereoscopic projection light, which can solve the technical problem of large volume of a stereoscopic projection polarization modulation device based on dual optical path polarization splitting technology. .
  • a polarization modulation device for stereoscopic projection light comprising:
  • a polarization beam splitting assembly for splitting a projection beam carrying image information into a first transmitted beam having two different polarization states, or having three different polarization states, a second transmitted beam, a first reflected beam, and a second Reflected beam
  • a first optical path direction adjusting component configured to adjust a propagation direction of the first reflected light beam, so that the first reflected light beam propagates in a direction in which the imaging surface is located;
  • a second optical path direction adjusting component configured to adjust a propagation direction of the second reflected light beam, so that the second reflected light beam propagates in a direction in which the imaging surface is located;
  • a polarization state modulation component configured to perform polarization state modulation on a part or all of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam in a frame order.
  • a second aspect of the embodiments of the present invention provides a stereoscopic image projection system, the system comprising:
  • a projector for sequentially projecting a projection beam carrying left eye image information and a projection beam carrying right eye image information in a frame order
  • a polarization modulation device which is a polarization modulation device for stereoscopic projection light provided by the second aspect of the embodiments of the present invention
  • a third aspect of the embodiments of the present invention provides a polarization modulation method for stereoscopic projection light, the method comprising the following steps:
  • Part or all of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam are polarization modulated in a frame order.
  • the embodiment of the present invention provides a polarization modulation device for stereoscopic projection light.
  • the projection polarization modulation device for stereoscopic light provided by the embodiment of the present invention uses a polarization beam splitting component to split the projection beam into The four different polarization states, or four beams having three different polarization states, including two transmitted beams and two reflected beams, are separated into two by a pair of complete image frames.
  • the reflected beam can effectively reduce the optical path difference between the reflected beam and the transmitted beam, so that the subsequent optical path direction adjusting component and the optical path compensation component can be selected in a smaller size. Thereby the overall device volume is greatly reduced.
  • FIG. 1 is a schematic diagram of a principle of a single optical path polarization splitting of a stereoscopic image projection system provided by the prior art
  • FIG. 2 is a schematic diagram of a principle of using a dual optical path polarization splitting in a stereoscopic image projection system provided by the prior art
  • FIG. 3 is a schematic structural diagram of a polarization modulation device for stereoscopic projection light according to a first embodiment of the present invention
  • FIG. 4A is a schematic structural diagram of a polarization modulation device for stereoscopic projection light according to a second embodiment of the present invention.
  • 4B is another structural schematic diagram of a polarization modulation device for stereoscopic projection light according to a second embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a polarization beam splitting assembly in the form of a prism group structure according to a second embodiment of the present invention.
  • FIG. 6A and FIG. 6B are schematic structural diagrams of a polarization modulation device for stereoscopic projection light according to a third embodiment of the present invention.
  • FIGS. 7A and 7B are schematic diagrams showing a wire grid structure of a polarization beam splitting layer on a first substrate according to a third embodiment of the present invention.
  • FIG. 8A and FIG. 8B are schematic diagrams showing a wire grid structure of a polarization beam splitting layer on a second substrate according to a third embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a polarization beam splitting assembly in the form of a prism group structure according to a third embodiment of the present invention.
  • FIG. 10A and FIG. 10B are schematic diagrams showing a wire grid structure of two polarization beam splitting layers in a polarization beam splitting assembly of a prism group structure according to a third embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an optical path of a mixed polarization region of two transmitted beams according to a third embodiment of the present invention.
  • FIG. 12A and FIG. 12B are schematic structural diagrams of a polarization modulation device for stereoscopic projection light according to a fourth embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a polarization beam splitting assembly in the form of a prism group structure according to a fourth embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a polarization modulation device for stereoscopic projection light according to a first embodiment of the present invention.
  • the polarization modulation device for stereoscopic projection light includes: a polarization beam splitting component. 31.
  • the first optical path direction adjusting component 32, the second optical path direction adjusting component 33, and the polarization state modulation component 34, and the functions of each component are as follows:
  • the polarization beam splitting assembly 31 is configured to split the projection beam carrying the image information into a first transmitted beam, a second transmitted beam, a first reflected beam, and a first polarized beam having four different polarization states, or having three different polarization states. Two reflected beams.
  • the polarization beam splitting component 31 can split the projection beam carrying the image information into a first transmitted beam having a first polarization state, a second transmitted beam having a second polarization state, and a first reflection having a third polarization state.
  • the beam splitting is a first transmitted beam and a second transmitted beam having a first polarization state, a first reflected beam having a second polarization state, and a second reflected beam having a third polarization state, wherein the first polarization state, the first polarization state
  • the polarization directions of the two polarization states and the third polarization state are different from each other.
  • the polarization modulation device for stereoscopic projection light provided by the embodiment of the present invention is placed between the projector and the imaging surface (ie, the curtain) during use, and is used for optically acting on the projection beam projected by the projector, so that the projection beam is Before being projected onto the imaging surface, there is a uniform polarization state such as linear polarization or circular polarization, and the imaging surface reflects the projection beam having the polarization state to the 3D glasses worn by the viewer, wherein the imaging surface needs to have polarization maintaining characteristics, that is, the imaging surface is The polarization state of the projected beam cannot be changed during the reflection of the projected beam, usually using a metal curtain.
  • the projector alternately projects the projection beam carrying the left eye image information and the projection beam carrying the right eye image information, for example, can be projected in a frame sequential manner, similar to playing a video, and the T1 moment projection image carrying the left eye image information. Projecting the beam, projecting the projection beam carrying the right eye image information at T2, projecting the projection beam carrying the left eye image information at time T3, projecting the projection beam carrying the right eye image information at time T4, ... and so on. From the hardware, the projector is required to support video playback with a frame frequency of 100 Hz or higher, and a digital micromirror projector, a liquid crystal projector on a silicon, or the like can be used.
  • the projection beam is polarized and split by the polarization beam splitting component 31.
  • the polarization beam splitting component 31 divides the projection beam into four beams, that is, the first transmitted beam, the first reflected beam, and the second transmission. Beam, second reflected beam.
  • the first transmitted beam and the second transmitted beam directly propagate in a direction in which the imaging surface is located, and the first reflected beam is reflected, and the direction of propagation is perpendicular to the direction of propagation of the corresponding first transmitted beam.
  • the first optical path direction adjusting component 32 and the second optical path direction adjusting component 33 are required to respectively adjust the first reflected beam and the second.
  • the direction of propagation of the reflected beam is such that the first reflected beam and the second reflected beam can propagate in the direction in which the imaging surface is located.
  • the first transmitted beam is identical to the image information carried by the first reflected beam and the imaging position on the imaging surface is the same
  • the second transmitted beam is identical to the image information carried by the second reflected beam and on the imaging surface The imaging position is the same.
  • both the first transmitted beam and the second transmitted beam propagate directly in the direction in which the imaging surface is located after splitting, the macroscopic view looks like a whole beam, but because of the polarization state of the two It may be different, in essence it should be understood that this is two different beams.
  • only the propagation paths of the first transmitted beam and the second transmitted beam are schematically shown in FIG. 3, in fact, since the projected beam projected by the projector is divergent, the projected beam is passed through the polarization beam splitting component 31.
  • the first transmitted beam and the second transmitted beam obtained after the beam are still divergent such that the first transmitted beam and the second transmitted beam partially overlap in the imaged area of the imaging surface.
  • the first polarization state, the second polarization state, the third polarization state, and the fourth polarization state are linear polarizations, for example, the polarization direction of the first polarization state is a horizontal direction, and the polarization direction and a horizontal direction of the second polarization state are The angle of the included angle is (0°, 90°), the third polarization state is orthogonal to the polarization direction of the first polarization state, and the fourth polarization state is orthogonal to the polarization direction of the second polarization state.
  • the polarization direction of the first polarization state is horizontal (P-polarized light)
  • the polarization direction of the second polarization state is 45° with the horizontal direction
  • the polarization direction of the third polarization state is vertical.
  • the angle of polarization of the fourth polarization state with the horizontal direction is -45°.
  • the polarization beam splitting component 31 can be formed by superposing a plurality of layers of optical films to form a polarizing beam splitting film for splitting and splitting, or by using an optical wire grid for splitting and splitting, or by using a polarization beam splitting film and an optical wire grid structure.
  • the beam is deflected, for example, the first transmitted beam and the first reflected beam are split by a polarization splitting film, and the second transmitted beam and the second reflected beam are split by an optical wire grid structure.
  • the first optical path direction adjusting component 32 is configured to adjust a propagation direction of the first reflected light beam such that the first reflected light beam propagates in a direction in which the imaging surface is located.
  • the adjustment direction of the first optical path direction adjusting component 32 may be such that the imaging position of the first reflected light beam finally overlaps with the imaging position of the first transmitted light beam.
  • the adjustment direction of the first optical path direction adjusting component 32 may be set.
  • Adjustable to facilitate adjustment of the imaging position of the first reflected beam on the imaging surface generally can be implemented by a mirror, a curved mirror that can enlarge or reduce the beam size, and the like, and of course, a lens or the like can also be used. Optics implementation that changes the direction of the light path.
  • the second optical path direction adjusting component 33 is configured to adjust a propagation direction of the second reflected light beam such that the second reflected light beam propagates in a direction in which the imaging surface is located.
  • the adjustment direction of the second optical path direction adjusting component 33 can make the second reflected beam finally overlap the imaging position of the imaging surface and the imaging position of the second transmitted beam.
  • the adjustment of the second optical path adjustment component can be performed.
  • the direction is set to be adjustable to facilitate adjusting the imaging position of the second reflected light beam 33 on the imaging surface, and can usually be implemented by a reflective mirror device such as a curved mirror that can enlarge or reduce the beam size.
  • a lens or the like is realized by an optical device that changes the direction of the optical path.
  • a polarization modulation component 34 configured to perform polarization state modulation on a part or all of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam in a frame order, so that the first transmitted beam, the first The two transmitted beams, the first reflected beam, and the second reflected beam have the same polarization state.
  • the polarization modulation component 34 sequentially modulates the four beams in a frame order into a polarization state that can only be received by the left eye and a polarization state that can only be received by the right eye, for example, modulating four beams of light into a current frame to be capable of being
  • the polarization state that the left eye receives but cannot be received by the right eye modulates the four beams of light into a polarization state that can be received by the left eye and received by the right eye in the next frame.
  • the polarization states of the four beams need to be modulated to be consistent before reaching the imaging surface.
  • only the polarization state of the partial beam can be modulated, for example, whether the image corresponding to the left eye image is played.
  • the frame is also an image frame corresponding to the right eye image
  • the polarization modulation component 34 modulates the polarization states of the second transmitted beam, the first reflected beam, and the second reflected beam to the polarization state of the first transmitted beam, such that the four beams of light are Having the same polarization state; four beams of light can also participate in the modulation process of the polarization state, for example, when playing the image frame corresponding to the left eye image, the polarization modulation component 34 will transmit the second transmitted beam, the first reflected beam, and the first The polarization states of the two reflected beams are all modulated to the polarization state of the first transmitted beam, such that the four beams have the same polarization state, and when the image frame corresponding to the right eye image is played, the polarization modulation component 34 will transmit the first transmitted beam.
  • the polarization states of the second transmitted beam and the second reflected beam are all modulated to the polarization state of the first reflected beam such that the four beams have the same
  • the polarization states of the four beams split by the polarization splitting assembly 31 are uniformly converted into the same polarization state of the linearity. Then, if the viewer wears the linear polarized glasses, the polarization modulation component only needs to be in each One frame can modulate the four beams into the same linear polarization state, and if the viewer wears the circularly polarized glasses, it needs to be further modulated into left-handed circularly polarized light and right-handed circularly polarized light. When it is desired to modulate into circularly polarized light, the polarization modulation component 34 needs to include: a polarization state converter and a light modulator.
  • the polarization converter needs to modulate four beams into a uniform linear polarization state at each frame. Based on the principle described above, the polarization converter has two working modes:
  • Mode 1 the polarization state converter performs polarization state modulation on a part of the first transmitted beam, the second transmitted beam, the first reflected beam and the second reflected beam, so that the first transmitted beam, the second transmitted beam, The first reflected beam and the second reflected beam have the same polarization state.
  • the polarization state converter performs polarization state modulation on a part of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam in a frame order.
  • the first transmitted light beam, the second transmitted light beam, the first reflected light beam, and the second reflected light beam having the same polarization state are further modulated by the light modulator into left-handed circularly polarized light and right-handed circularly polarized light in a frame order.
  • the above-described light modulator may further modulate the first transmitted light beam, the second transmitted light beam, the first reflected light beam, and the second reflected light beam having the same polarization state into left-handed elliptically polarized light and right-handed elliptically polarized light in a frame order.
  • the polarization direction of the left-handed circularly polarized light is orthogonal to the polarization direction of the right-handed circularly polarized light
  • the polarization direction of the left-handed elliptically polarized light is orthogonal to the polarization direction of the right-handed elliptically polarized light.
  • the polarization converter when the polarization converter operates in the above mode one, it can be implemented by using a wave plate, a TN liquid crystal cell or the like.
  • the above light modulator can be implemented by a device having a quarter-wavelength delay function, such as a liquid crystal device or a quarter-wave plate, which can be a light beam shared by four light paths, or can be respectively separated by four light paths. Set up a light modulator.
  • a device having a quarter-wavelength delay function such as a liquid crystal device or a quarter-wave plate, which can be a light beam shared by four light paths, or can be respectively separated by four light paths.
  • the optical path of the reflected beam and the transmitted beam is effectively reduced.
  • the subsequent optical path direction adjusting component and the optical path compensation component can be selected in a smaller size, so that the volume of the entire device is greatly reduced.
  • the structure and position of the polarization beam splitting assembly 31 and the polarization converter in the first embodiment of the present invention can be variously designed. As long as the above optical functions can be satisfied, several embodiments will be further explained below for explanation and explanation. It should be understood that, in the specific implementation, those skilled in the art can also flexibly change other various embodiments according to the needs of the present invention.
  • FIG. 4A shows a polarization modulation device for stereoscopic projection light according to a second embodiment of the present invention.
  • the polarization beam splitting assembly in this embodiment is used to split a projection beam carrying image information into three different polarization states.
  • a transmitted beam, a second transmitted beam, a first reflected beam and a second reflected beam are suitable for the situation in which the viewer wears the circularly polarized glasses.
  • the polarization beam splitting assembly includes a first substrate 3111 and a second substrate 3112.
  • the two substrates are connected to each other in a V shape, and the connected positions are formed with a ridge A1, and the convex direction of the ridge A1 and the projection beam The direction of propagation is reversed, that is, the convex direction of the ridge A1 faces the projector.
  • the first substrate 3111 is provided with a first polarization beam splitting layer
  • the second substrate 3112 is provided with a second polarization beam splitting layer.
  • the first polarizing beam splitting layer on the first substrate 3111 is transmissive.
  • the first transmitted beam is reflected and the first reflected beam is reflected
  • the second polarizing beam splitting layer on the second substrate 3112 is transmissive to the second transmitted beam and reflects the second reflected beam.
  • the function of the first optical path direction adjusting component 321 in this embodiment is the same as the function of the first optical path direction adjusting component 32 in the first embodiment, and the function and the first implementation of the second optical path direction adjusting component 331 in this embodiment.
  • the functions of the second optical path direction adjusting component 33 in the example are the same, and details are not described herein.
  • the polarizing beam splitting layer is formed by stacking a plurality of layers of optical films.
  • the plurality of optical films can be attached to a glass plate, and when the projection beam passes through the plurality of optical films, the beam can be split.
  • the transmitted light beam and the reflected light beam having different polarization directions are, for example, splittable into a transmitted light beam having a vertical polarization direction and a reflected light beam having an angle of polarization of 45° with respect to the vertical direction.
  • the polarization direction of the first reflected beam is orthogonal to the polarization direction of the first transmitted beam, and the polarization direction of one of the second transmitted beam and the second reflected beam is opposite to the polarization direction of the first transmitted beam or the first reflected beam.
  • the interval between the polarization direction of the second reflected beam and the polarization direction of the second transmitted beam is (0°, 90°), and the angle may specifically be 45°; or the second reflected beam
  • the polarization direction is orthogonal to the polarization direction of the second transmitted beam, and one of the first transmitted beam and the first reflected beam has the same polarization direction as the second transmitted beam or the second reflected beam, and the first reflection
  • the interval between the polarization direction of the light beam and the polarization direction of the first transmitted light beam is (0°, 90°), and the angle may specifically be 45°.
  • the polarization direction of the first reflected beam is orthogonal to the polarization direction of the first transmitted beam
  • the polarization direction of the second transmitted beam is the same as the polarization direction of the first transmitted beam
  • the polarization direction of the second reflected beam is second.
  • the angle of the polarization direction of the transmitted beam is (0°, 90°); or the polarization direction of the second reflected beam is orthogonal to the polarization direction of the second transmitted beam, and the polarization direction of the second transmitted beam is
  • the polarization directions of a transmitted beam are the same, and the angle between the polarization direction of the first reflected beam and the polarization direction of the first transmitted beam is (0°, 90°).
  • the polarization state modulation component includes a first polarization state converter 3411, a second polarization state converter 3412, and a light modulator 3413.
  • the first polarization converter 3411 and the second polarization converter 3412 are respectively located in the optical paths of the first reflected beam and the second reflected beam, and are used for adjusting polarization states of the first reflected beam and the second reflected beam.
  • the polarization states of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam are made the same.
  • FIG. 4B is another structural schematic diagram of a polarization modulation device for stereoscopic projection light according to a second embodiment of the present invention.
  • the polarization direction of the first reflected beam and the polarization of the first transmitted beam are shown in FIG. 4B.
  • the direction is orthogonal, the polarization direction of the second transmitted beam is the same as the polarization direction of the first reflected beam, and the interval between the polarization direction of the second reflected beam and the polarization direction of the second transmitted beam is (0°, 90).
  • the polarization direction of the second reflected beam is orthogonal to the polarization direction of the second transmitted beam, the polarization direction of the second transmitted beam is the same as the polarization direction of the first reflected beam, and the polarization direction of the first reflected beam is The angle between the polarization directions of a transmitted beam is (0°, 90°).
  • the positions of the first polarization converter 3411 and the second polarization converter 3412 have various variations, and the above preferred embodiments only describe two of them, and the remaining cases include: respectively The optical path where the reflected beam and the second transmitted beam are located, the optical path where the first transmitted beam and the second transmitted beam are respectively located, and the optical paths where the first transmitted beam and the second reflected beam are respectively located are not described herein.
  • the polarization converter located on the first reflected beam or the second reflected beam may be located between the polarization beam splitting assembly and the first optical path direction adjusting component or the second optical path direction adjusting component.
  • the first modulator After modulating the polarization states of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam to the same polarization state, the first modulator transmits the first transmitted beam having the same polarization state, The second transmitted beam, the first reflected beam, and the second reflected beam are modulated in frame order into left-handed circularly polarized light and right-handed circularly polarized light.
  • the light modulator 3413 adjusts each of the light beams to left-handed circularly polarized light,
  • the left lens of the circular polarized glasses worn by the viewer can transmit the left circularly polarized light, and the right lens cannot transmit the left circularly polarized light;
  • the light modulator 3413 adjusts the respective beams to the right circular polarization.
  • the light is such that the right lens of the circularly polarized glasses worn by the viewer can transmit the right circularly polarized light, and the left lens cannot pass the right circularly polarized light.
  • the light modulator 3413 may further modulate the first transmitted light beam, the second transmitted light beam, the first reflected light beam, and the second reflected light beam having the same polarization state into left-handed elliptically polarized light and right-handed elliptically polarized light in a frame order.
  • the polarization beam splitting assembly can also be designed as a structure of a polarization beam splitting prism group.
  • the polarization beam splitting prism group is formed by bonding at least three equal-angle prisms of the first prism 3121, the second prism 3122 and the third prism 3123, and the whole is a rectangular parallelepiped structure, and three isosceles right-angle prisms are attached.
  • the two right-angled sides of the third prism 3123 are respectively attached to the oblique sides of the first prism 3121 and the oblique sides of the second prism 3122, and the bonding portions respectively have a first polarization beam splitting layer 3124 and a second polarization beam splitting layer 3125, first The polarization beam splitting layer 3124 and the second polarization beam splitting layer 3125 are perpendicular and connected to each other in a V shape, and the connected positions are formed with a ridge A2 whose convex direction is opposite to the propagation direction of the projection beam, and the projection beam projection
  • the first polarizing beam splitting layer 3124 can transmit the first transmitted light beam and reflect the first reflected light beam
  • the second polarizing beam splitting layer 3125 can transmit the second transmitted beam and reflect the second reflected beam.
  • the surface on which the ridge A2 is located is the incident surface of the projection beam. In specific use, it is prefer
  • the first polarization splitting layer 3124 and the second polarization splitting layer 3125 can also be formed by stacking a plurality of layers of optical films.
  • the transmitted light can be split. a first transmitted beam having a first polarization state, and a first reflected beam having a second polarization state; and when the non-polarized projection beam is incident on the optical film on the second polarization beam splitting layer 3125, the transmission is splittable a second transmitted beam having a first polarization state and a second reflected beam having a third polarization state.
  • the projection beam corresponding to a complete image frame is split into two reflected beams by the polarization splitting layer on the two substrates when polarized, or two polarizations inside the prism group.
  • the light splitting layer is divided into two reflected light beams, which effectively reduces the optical path difference between the reflected light beam and the transmitted light beam, so that the subsequent optical path direction adjusting component and the optical path compensation component can be selected in a smaller size, thereby greatly reducing the volume of the entire device, and
  • the polarizing beam splitting assembly of this "V" shape can be made thinner and the thickness is reduced by about half compared to the slanting plate type splitting prism of the double optical path.
  • FIG. 6A shows a polarization modulation device for stereoscopic projection light according to a third embodiment of the present invention.
  • the polarization beam splitting assembly in this embodiment is used to split a projection beam carrying image information into The first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam having four different polarization states are also suitable for the case where the viewer wears the circularly polarized glasses.
  • the polarization splitting layer on the first substrate 3111 and the second substrate 3112 in the polarization beam splitting assembly adopts a wire grid structure to realize polarization splitting.
  • FIG. 7A or FIG. 7B is A wire grid structure on the polarization splitting layer on the first substrate 3111;
  • FIG. 8A or FIG. 8B is a wire grid structure on the polarization beam splitting layer on the second substrate 3112.
  • the alignment direction of the wire grids in the polarization splitting layer of the first substrate 3111 has a certain angle with the arrangement direction of the wire grids in the polarization splitting layer of the second substrate 3112, and the range of the included angle is (0°, 90°). In this embodiment, the angle may preferably be 45°.
  • the angle between the polarization direction of the first polarization state and the polarization direction of the second polarization state is (0°, 90°)
  • the polarization direction of the third polarization state is orthogonal to the polarization direction of the first polarization state.
  • the polarization direction of the fourth polarization state is orthogonal to the polarization direction of the second polarization state.
  • the above angle may preferably be 45°.
  • the polarization splitting layer on the first substrate 3111 and the second substrate 3112 in the polarization beam splitting assembly may also be formed by superposing a plurality of layers of optical films to form a polarization splitting film to realize polarization splitting.
  • the polarization modulation component includes: a first polarization state converter, a second polarization state converter, a second polarization state converter, and a light modulator.
  • the first polarization converter, the second polarization converter, and the second polarization converter are located at any three of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam a light path for adjusting a polarization state of a light beam passing through the first polarization state converter, the second polarization state converter, and the second polarization state converter, such that the first transmitted light beam, the second transmitted light beam, and the first reflected light beam The second reflected beam has the same polarization state.
  • the first polarization converter 3421 is located on the optical path where the first reflected beam is located for converting the polarization state of the first reflected beam from the third polarization state to the first a polarization state; a second polarization state converter 3422 is located on the optical path where the second transmission beam is located, for converting the polarization state of the second transmission beam from the second polarization state to the first polarization state; the third polarization state converter 3423 is located The optical path on which the second reflected beam is located is used to convert the polarization state of the second reflected beam from the fourth polarization state to the first polarization state.
  • FIG. 6B shows another structural principle diagram of the polarization modulation device for stereoscopic projection light according to the second embodiment of the present invention.
  • the first polarization state converter 3421 can also be used.
  • the second polarization state converter 3422 is disposed on the light of the second transmitted beam
  • the third polarization state converter 3423 is disposed on the optical path where the second reflected beam is located, for the second reflected beam The polarization state is converted from a fourth polarization state to a third polarization state.
  • the first polarization state converter 3421, the second polarization state converter 3422, and the three polarization state converter 3423 are arranged in a total of four cases. The above preferred embodiment describes only two of them. The remaining two cases are not described here.
  • the polarization converter located on the first reflected beam or the second reflected beam may be located between the polarization beam splitting assembly and the first optical path direction adjusting component or the second optical path direction adjusting component.
  • the light modulator 3424 will uniformly have the first polarization state or
  • the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam of the third polarization state are modulated in frame order into left-handed circularly polarized light and right-handed circularly polarized light, for example, in the current frame, the light modulator 3424 Adjusting each beam to left-handed circularly polarized light so that the left lens of the circularly polarized glasses worn by the viewer can transmit the left-handed circularly polarized light, and the right lens cannot pass the left-handed circularly polarized light; in the next frame, the light modulator The 3424 adjusts each of the light beams to right-handed circularly polarized light so that the right lens of the circularly polarized glasses worn by the viewer can transmit the right-handed circularly polarized light, and
  • the light modulator 3424 may further modulate the first transmitted light beam, the second transmitted light beam, the first reflected light beam, and the second reflected light beam having the same polarization state into left-handed elliptically polarized light and right-handed elliptically polarized light in a frame order.
  • the polarization beam splitting assembly can also be designed as a structure of a polarization beam splitting prism group.
  • the polarizing beam splitting prism group is formed by bonding at least three equal-angle prisms of the first prism 3131, the second prism 3132, and the third prism 3133.
  • the laminated body has a rectangular parallelepiped structure and three isosceles right-angle prisms. Made of a transparent substrate.
  • the two right-angled sides of the third prism 3133 are respectively matched with the oblique sides of the first prism 3131 and the oblique sides of the second prism 3132, and the bonding portions respectively have a first polarization beam splitting layer 3134 and a second polarization beam splitting layer 3135, first The polarization beam splitting layer 3134 and the second polarization beam splitting layer 3135 are perpendicular and connected to each other in a V shape, and the connected positions are formed with a ridge A3 whose convex direction is opposite to the propagation direction of the projection beam, and the projection beam projection
  • the first polarizing beam splitting layer 3134 can transmit the first transmitted light beam and reflect the first reflected light beam
  • the second polarizing beam splitting layer 3135 can transmit the second transmitted beam and reflect the second reflected beam.
  • the surface on which the ridge A3 is located is the incident surface of the projection beam. In specific use, it is
  • the first polarization beam splitting layer 3134 and the second polarization beam splitting layer 3135 can also adopt a wire grid structure.
  • the beam can be split and transmitted. a first transmitted beam of a first polarization state, and a first reflected beam of light having a third polarization state;
  • the transmission is splittable a second transmitted beam having a second polarization state and a second reflected beam having a fourth polarization state.
  • FIGS. 10A and 10B respectively show the wire grid structure on the first polarization beam splitting layer 3124 and the wire grid structure on the second polarization beam splitting layer 3125, It can be seen that when the wire grids in FIG. 10A are arranged in the vertical direction, when the non-polarized projection beam R Randomly is incident on the wire grid structure on the first polarization beam splitting layer 3124, the first polarization can be split and transmitted. a first transmitted beam R 1 and a reflected first reflected beam R 2 having a third polarization state; and in FIG.
  • the transmitted second transmitted light beam R 3 having the second polarization state and the reflected second reflected light beam R 4 having the fourth polarization state may be split.
  • the first polarization beam splitting layer 3134 and the second polarization beam splitting layer 3135 in the prism group structure may also be formed by superposing a plurality of layers of optical films to form a polarization beam splitting film to realize polarization splitting.
  • the projection beam corresponding to a complete image frame is split into two reflected beams by the polarization beam splitting layer on the two substrates when polarized, or by two inside the prism group.
  • the polarizing beam splitting layer is divided into two reflected beams, which effectively reduces the optical path difference between the reflected beam and the transmitted beam, so that the subsequent optical path direction adjusting component and the optical path compensation component can be selected in a smaller size, thereby greatly reducing the volume of the entire device.
  • the polarization splitting assembly of the "V"-shaped structure can be made thinner and the thickness is reduced by about half compared with the swash plate type splitting prism of the double optical path.
  • the projection beam is not strictly divided into two parts which do not cross each other when passing through the polarization beam splitting assembly, and actually the part of the beam passing through the upper part of the polarization beam splitting component is partially propagated.
  • a part of the light beam passing through the lower half of the polarization beam splitting assembly is also propagated to the upper side, so that the two regions of the polarization state are actually mixed together in the central region of the imaging surface, as shown in FIG.
  • the scribe line indicates the upper half of the projected beam, and the "long and short lines" indicate the lower half of the projected beam. It can be seen that after transmission through the polarizing beam splitting assembly, there is a mixture of the upper and lower halves of the projected beam.
  • the fourth embodiment of the present invention provides a polarization modulation device for stereoscopic projection light, and this embodiment is suitable for a situation in which a viewer wears circularly polarized glasses.
  • the difference from the third embodiment is the position where the second polarization converter 3422 is placed in this embodiment.
  • the first polarization converter 3421 is located at the first reflected beam.
  • An optical path for converting a polarization state of the first reflected beam into a first target polarization state the second polarization state converter 3422 being attached to the first polarization beam splitting layer in the polarization beam splitting assembly, and located at the first polarization beam splitting layer Transmitting a side of the first transmitted beam for converting a polarization state of the first transmitted beam to a first target polarization state, and a third polarization state converter 3423 is located at an optical path of the second reflected beam for providing a second reflection Converting a polarization state of the beam to a first target polarization state, wherein the first target polarization state is the same as the polarization state of the second transmission beam;
  • the first polarization state converter 3421 is located in the optical path where the first reflected beam is located for converting the polarization state of the first reflected beam into the second target polarization state, and the second polarization state converter 3422 is attached to the polarization group.
  • a second polarization beam splitting layer in the beam assembly located on a side of the second polarization beam splitting layer that is transmissive to the second transmitted light beam, for converting a polarization state of the second transmitted light beam into a second target polarization state, a third polarization state
  • the converter 3423 is located at an optical path where the second reflected beam is located for converting the polarization state of the second reflected beam into a second target polarization state, the second target polarization state being the same as the polarization state of the first transmitted beam.
  • the polarization state of the second transmitted beam is converted with respect to the second transmitted beam before being mixed with the first transmitted beam, and the polarization states of the beams in the mixed region shown in FIG. 11 are already identical. .
  • the second polarization state converter 3422 can be packaged in the polarization beam splitting prism group, and the second polarization beam splitting layer 3135 can transmit the second transmission.
  • One side of the beam as shown in Figure 13.
  • the first polarization state converter 3421 may also be packaged on a side of the first polarization beam splitting layer 3134 that can transmit the first transmitted light beam.
  • the polarization converter can also be attached in the manner described in the fourth embodiment of the present invention.
  • the first polarizing beam splitting layer attached to the polarizing beam splitting component may transmit one side of the first transmitted light beam; or the second polarizing beam splitting layer attached to the polarization beam splitting component may transmit the second polarizing beam splitting layer One side of the transmitted beam.
  • the projection beam corresponding to a complete image frame is divided into two polarization splitting layers on the two substrates or two polarization splitting layers inside the prism group not only during the polarizing. Reflecting the beam, and before the second transmitted beam is mixed with the first transmitted beam, the polarization state of the second transmitted light is converted, thereby effectively reducing the optical path difference between the reflected beam and the transmitted beam, thereby making the entire device While the volume is greatly reduced, it is more advantageous for the subsequent polarization modulation component to modulate the polarization states of the two transmitted beams.
  • the polarization splitting component of the "V"-shaped structure and the swash plate type of the dual optical path in this embodiment Compared with the splitting prism, it can also be made thinner and the thickness is reduced by almost half.
  • a fifth embodiment of the present invention also provides a stereoscopic image projection system including a projector, a polarization modulation device, and a screen.
  • the projector is configured to sequentially project a projection beam carrying left eye image information and a projection beam carrying right eye image information in a frame order;
  • the polarization modulation device may adopt the polarization modulation device provided by any of the above embodiments;
  • the curtain is used to image each of the projection beams having the same polarization state modulated by the polarization modulation device for the stereoscopic projection light as an imaging surface, and to reflect the resultant image to the 3D glasses worn by the user.
  • a sixth embodiment of the present invention also provides a polarization modulation method for stereoscopic projection light, the method comprising the following steps:
  • step S1 the projection beam carrying the image information is split into a first transmitted beam, a second transmitted beam, a first reflected beam and a second reflected beam having four different polarization states or having three different polarization states.
  • step S2 the propagation directions of the first reflected beam and the second reflected beam are adjusted such that the first reflected beam and the second reflected beam propagate in a direction in which the imaging surface is located.
  • Step S3 performing polarization state modulation on part or all of the first transmitted beam, the second transmitted beam, the first reflected beam, and the second reflected beam in a frame order, such that the first transmitted beam, The second transmitted beam, the first reflected beam, and the second reflected beam have the same polarization state.
  • a filtering device for filtering may be disposed in the optical path of each beam, so that the polarization states of the beams are more Pure, it is also possible to set the optical path compensation component in the optical path of part of the beam so that all the beams have the same optical path when they reach the imaging surface.

Abstract

La présente invention porte sur un dispositif et un procédé de modulation de polarisation de lumière de projection stéréoscopique, et sur un système de projection d'image stéréoscopique. Le dispositif comprend un ensemble de division de faisceau de polarisation, des premier et second ensembles de réglage de direction de trajet optique, et un ensemble de modulation d'état de polarisation, l'ensemble de division de faisceau de polarisation pouvant diviser un faisceau lumineux projeté portant des informations d'image en premier et second faisceaux lumineux émis et en premier et second faisceaux lumineux réfléchis qui présentent quatre ou trois états de polarisation différents. Par rapport à la technologie existante, au moyen de la division d'un faisceau lumineux correspondant à un écran d'image complète en deux faisceaux lumineux réfléchis lorsqu'ils sont polarisés, la présente invention permet de réduire efficacement la différence de trajet optique entre un faisceau lumineux réfléchi et un faisceau lumineux émis contrairement à un procédé de division de polarisation de trajet optique double ayant seulement un faisceau lumineux réfléchi, de telle sorte qu'un ensemble de réglage de direction de trajet optique ultérieur et un ensemble de compensation de trajet optique peuvent être sélectionnés en une taille inférieure, ce qui permet de réduire considérablement la taille globale du dispositif.
PCT/CN2019/076800 2018-04-18 2019-03-04 Dispositif et procédé de modulation de polarisation de lumière de projection stéréoscopique, et système de projection d'image stéréoscopique WO2019201020A1 (fr)

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