CN113568267A - Projection device for projecting stereo image - Google Patents
Projection device for projecting stereo image Download PDFInfo
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- CN113568267A CN113568267A CN202010350657.6A CN202010350657A CN113568267A CN 113568267 A CN113568267 A CN 113568267A CN 202010350657 A CN202010350657 A CN 202010350657A CN 113568267 A CN113568267 A CN 113568267A
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- image light
- polarized image
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B35/00—Stereoscopic photography
- G03B35/18—Stereoscopic photography by simultaneous viewing
- G03B35/26—Stereoscopic photography by simultaneous viewing using polarised or coloured light separating different viewpoint images
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
Abstract
The invention relates to a projection device for projecting a three-dimensional image, which consists of a projection module, an ultrafast polarization modulator, a polarizer, a reflector module and a reflective diffusion sheet, wherein when the projection module projects image light formed by alternately projecting first image light and second image light, the image light is switched into first polarized image light and second polarized image light through the ultrafast polarization modulator, and then the first polarized image light is reflected and transmitted to the reflective diffusion sheet through the polarizer, so that the first polarized image light is projected to a first eye receiving range, and the second polarized image light is projected to a second eye receiving range to form a three-dimensional visual effect; particularly, the reflective diffusion sheet is composed of a base and a plurality of micro-curved mirrors arranged on the base in an array mode, and each micro-curved mirror can be manufactured into a reflection angle meeting requirements according to design, so that the reflective diffusion sheet has higher directivity freedom degree.
Description
Technical Field
The present invention relates to a projection device, and more particularly, to a projection device for projecting a stereoscopic image.
Background
In the current method for generating stereoscopic images, two eyes receive different images, and the images received by the left and right eyes are combined after being processed by the brain, so as to generate a stereoscopic effect. The color difference glasses composed of red and blue lenses have appeared earlier, and then the problem that the correct color of the image cannot be seen is caused by the color difference glasses, so that the generation of polarized glasses or liquid crystal shutter glasses is existed.
In recent years, there is also a projection device capable of generating stereoscopic image effect without wearing glasses in the market, as shown in fig. 1 and fig. 2, japanese patent No. 3526157B2 "a directional reflective image and image display apparatus" is disclosed, which mainly comprises a lens assembly 11 and a lens assembly 12 that together form a reflective screen 10, a cross-sectional view of the lens assembly 11 in the horizontal direction is shown in fig. 2, the lens assembly 11 has a first reflective surface 111 and a second reflective surface 112 that are fixed, the first reflective surface 111 has a first included angle θ 1, the second reflective surface 112 has a second included angle θ 2, the first included angle θ 1 and the second included angle θ 2 are both between 0 ° and 90 °, and the first included angle θ 1 is smaller than the second included angle θ 2, and the lens assembly 12 is used for scattering images reflected from the lens assembly 11, so as to increase the range of stereoscopic images that can be observed in the vertical direction.
With the above structure, the left eye image and the right eye image projected on the reflective screen 10 are reflected by the first reflective surface 111 and the second reflective surface 112 of the lens assembly 11, and then diffused by the lens assembly 12, so that the left eye image is projected to the left eye, and the right eye image is projected to the right eye, so that the left eye and the right eye of the observer receive different images, respectively, thereby achieving the effect of generating a stereoscopic image.
However, the reflective screen 10 is composed of only two components, and when the reflection or refraction angle needs to be adjusted, the lens assembly 11 or the lens assembly 12 needs to be manufactured again, which results in poor directional freedom. In view of the above, it is necessary to provide a new technical solution to solve the foregoing drawbacks.
Disclosure of Invention
The invention aims to provide a projection device which projects a stereoscopic image and has better directional freedom.
To achieve the above object, the present invention provides a projection apparatus for projecting a stereoscopic image, comprising:
a projection module for alternately projecting the first image light and the second image light;
an ultrafast polarization modulator for converting the first image light and the second image light into a first polarized image light and a second polarized image light, wherein the first polarized image light and the second polarized image light are light rays with polarization directions perpendicular to each other;
a polarizer reflecting the first polarized image light and transmitting the second polarized image light;
the reflector module reflects the first polarized image light and the second polarized image light; and
the reflective diffusion sheet is provided with an array consisting of micro-curved mirrors, the micro-curved mirrors diffuse the first polarized image light to a first eye receiving range, and the micro-curved mirrors diffuse the second polarized image light to a second eye receiving range.
In a preferred embodiment, when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light.
In a preferred embodiment, when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light.
In a preferred embodiment, the polarizer is a reflective polarizer or a polarizing beam splitter.
In a preferred embodiment, the micro-curved mirror further includes a windshield, the micro-curved mirror diffuses the first polarized image light to the windshield and reflects the first polarized image light to the first eye receiving range, and the micro-curved mirror diffuses the second polarized image light to the windshield and reflects the second polarized image light to the second eye receiving range.
In a preferred embodiment, the polarizer further includes a quarter-wave plate disposed behind the polarizer, and the first polarized image light and the second polarized image light are converted into circularly polarized light or elliptically polarized light by the quarter-wave plate.
In a preferred embodiment, a concave mirror is disposed between the windshield and the reflective diffusion sheet.
In a preferred embodiment, the mirror module has a first mirror group and a second mirror group, the first mirror group reflects the first polarized image light to the reflective diffusion sheet, and the second mirror group reflects the second polarized image light to the reflective diffusion sheet.
A projection device for projecting stereoscopic images, comprising:
a projection module for alternately projecting the first image light and the second image light;
an ultrafast polarization modulator for converting the first image light and the second image light into a first polarized image light and a second polarized image light, wherein the first polarized image light and the second polarized image light are light rays with polarization directions perpendicular to each other;
a polarizer reflecting the first polarized image light and transmitting the second polarized image light;
the reflector module reflects the second polarized image light and penetrates through the polarizer; and
the reflective diffusion sheet is provided with an array consisting of micro-curved mirrors, the micro-curved mirrors diffuse the first polarized image light to a first eye receiving range, and the micro-curved mirrors diffuse the second polarized image light to a second eye receiving range.
In a preferred embodiment, when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light.
In a preferred embodiment, when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light.
In a preferred embodiment, the polarizer is a reflective polarizer.
In a preferred embodiment, the micro-curved mirror further includes a windshield, the micro-curved mirror diffuses the first polarized image light to the windshield and reflects the first polarized image light to the first eye receiving range, and the micro-curved mirror diffuses the second polarized image light to the windshield and reflects the second polarized image light to the second eye receiving range.
In a preferred embodiment, the polarizer further includes a quarter-wave plate disposed behind the polarizer, and the first polarized image light and the second polarized image light are converted into circularly polarized light or elliptically polarized light by the quarter-wave plate.
In a preferred embodiment, a concave mirror is disposed between the windshield and the reflective diffusion sheet.
In a preferred embodiment, the micro-curved mirror is a concave mirror or a convex mirror.
In a preferred embodiment, the reflective diffusion sheet has a base, the base is a curved surface or a flat surface, and each of the micro-curved mirrors is disposed on the base.
In a preferred embodiment, the number of the micro-curved mirrors is plural, and each of the micro-curved mirrors is arranged in a square array or a honeycomb array.
In a preferred embodiment, the side length of the micro-curved mirror is 25 μm to 0.25 mm.
A projection device for projecting stereoscopic images, comprising:
a first projection module projecting a first image light;
a second projection module projecting a second image light;
the reflective diffusion sheet is provided with an array of micro-curved mirrors, the micro-curved mirrors diffuse the first image light to a first eye receiving range, and the micro-curved mirrors diffuse the second image light to a second eye receiving range.
In a preferred embodiment, the micro-curved mirror further includes a windshield, the micro-curved mirror diffuses the first polarized image light to the windshield and reflects the first polarized image light to the first eye receiving range, and the micro-curved mirror diffuses the second polarized image light to the windshield and reflects the second polarized image light to the second eye receiving range.
In a preferred embodiment, a concave mirror is disposed between the windshield and the reflective diffusion sheet.
In a preferred embodiment, the reflective diffusion sheet has a base, the base is a curved surface or a flat surface, and each of the micro-curved mirrors is disposed on the base.
In a preferred embodiment, the number of the micro-curved mirrors is plural, and each of the micro-curved mirrors is arranged in a square array or a honeycomb array.
Therefore, the left eye receives the first polarized image light or the first image light, the right eye receives the second polarized image light or the second image light, so that a user can generate an effect of naked-eye stereoscopic images without wearing any accessory.
Drawings
Fig. 1 is a perspective view of a display screen of a directional reflection image and video display apparatus of japanese bulletin board No. 3526157B 2;
FIG. 2 is a transverse sectional view of the lens assembly of the directional reflection image and image display apparatus of Japanese publication No. 3526157B 2;
FIG. 3 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 4 is a schematic diagram of the switching of an ultrafast polarization modulator;
FIG. 5 is a schematic view of image light passing through a reflective polarizer;
FIG. 6A is a schematic view of the micro-curved mirrors of the present invention arranged on a base in square groups;
FIG. 6B is a schematic view of the micro-mirrors of the present invention arranged in a honeycomb array on a base;
FIG. 7 is a schematic size diagram of a micro-curved mirror according to the present invention;
FIG. 8 is a perspective view of different micro-mirrors of the present invention;
FIG. 9 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a sixth embodiment of the present invention;
FIG. 14 is a schematic structural diagram of a seventh embodiment of the present invention;
FIG. 15 is a schematic structural diagram of an eighth embodiment of the present invention;
FIG. 16 is a schematic structural diagram of a ninth embodiment of the present invention;
FIG. 17 is a schematic structural diagram of a tenth embodiment of the present invention;
FIG. 18 is a schematic structural diagram of an eleventh embodiment of the present invention;
FIG. 19 is a schematic structural diagram of a twelfth embodiment of the present invention;
FIG. 20 is a schematic structural view of a thirteenth embodiment of the present invention;
FIG. 21 is a schematic structural diagram of a fourteenth embodiment of the present invention;
FIG. 22 is a schematic structural diagram of a fifteenth embodiment of the present invention;
FIG. 23 is a schematic structural diagram of a sixteenth embodiment of the present invention;
FIG. 24 is a schematic diagram illustrating the reflection and refraction characteristics of the present invention;
FIG. 25 is a schematic diagram illustrating the reflection and refraction characteristics of the present invention;
FIG. 26 is a schematic diagram illustrating the assembly characteristics of a quarter-wave plate;
FIG. 27 is a schematic diagram illustrating the assembly characteristics of a quarter-wave plate;
FIG. 28 is a schematic diagram illustrating the assembly characteristics of a quarter wave plate;
FIG. 29 is a schematic diagram illustrating the assembly characteristics of a quarter-wave plate.
Description of the symbols in the drawings:
the prior art is as follows:
reflecting screen 10 and mirror assembly 11
First reflecting surface 111 and second reflecting surface 112
The first included angle theta 1 of the lens group 12
Second included angle theta 2
The invention comprises the following steps:
First reflector set 51 and second reflector set 52
First polarized image light DL' second image light DR
Second polarized image light DR' first eye receiving range LA
Second eye reception range RA
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 3, a projection apparatus for projecting a stereoscopic image according to a first embodiment of the present invention mainly comprises a projection module 20, an ultrafast polarization modulator 30, a polarizer 40, a mirror module 50 and a reflective diffuser 60, wherein:
the projection module 20 alternately projects the first image light DL and the second image light DR at a speed of 120fps (frames Per second);
the ultrafast Polarization Modulator 30 (X-FPM) converts the first image light DL into a first polarized image light DL ', and converts the second image light DR into a second polarized image light DR'; as shown in fig. 4, the ultrafast polarization modulator 30 is configured to control polarization of light by applying a driving voltage externally, so as to convert natural light into polarized light, and has the advantages of no vibration and small occupied area, and the technology of the ultrafast polarization modulator 30 belongs to the general knowledge in the optical field, and thus will not be described herein again. Alternatively, the ultrafast Polarization Modulator 30 may be replaced with a Fast Polarization Modulator (FPM).
A Polarizer 40(Polarizer) reflecting the first polarized image light DL 'and transmitting the second polarized image light DR'; as shown in fig. 5, the polarizer 40 refers to an optical component capable of separating natural light into polarized light, and the polarizer 40 separates the natural light into two polarized lights (linear polarization perpendicular to each other or circular polarization directions opposite to each other), wherein one polarized light can pass through the polarizer 40, and the other polarized light is reflected by the polarizer 40.
The reflector module 50 has a first reflector 51 and a second reflector 52, the first reflector 51 reflects the first polarized image light DL 'to the reflective diffuser 60, and the second reflector 52 reflects the second polarized image light DR' to the reflective diffuser 60.
The reflective diffuser 60 has a planar base 61 and an array of micro-mirrors 62 on the base 61, the micro-mirrors 62 reflect the first polarized image light DL 'to the first eye receiving range LA, and the micro-mirrors 62 reflect the second polarized image light DR' to the second eye receiving range RA.
As shown in fig. 6A and 6B, in the first embodiment, the micro-mirrors 62 can be arranged in a square array as shown in fig. 6A or in a honeycomb array as shown in fig. 6B.
As shown in fig. 7, the side length of each micro-curved mirror 62 in the first embodiment is about 25 μm to 0.25mm, the micro-curved mirrors 62 are various, the size of the first embodiment is merely given as an example in a preferred implementation state, and the actual size of the micro-curved mirror 62 is not limited thereto.
In the first embodiment, in order to make each micro-curved mirror 62 capable of diffusing the first polarized image light DL 'to the first eye receiving range LA and the second polarized image light DR' to the second eye receiving range RA, each micro-curved mirror 62 designs a required reflection angle according to an actual position of the assembly; fig. 8 shows three types of micro-curved mirrors 62A, 62B, and 62C with different reflection angles, the reflection angle of each micro-curved mirror 62A, 62B, and 62C is not limited to the embodiment shown, and the reflection angle can be designed to be any direction as required, so that each micro-curved mirror 62A, 62B, and 62C can only diffuse the first polarized image light DL 'to the first eye receiving range LA and the second polarized image light DR' to the second eye receiving range RA.
When the first image light DL is converted into the first polarized image light DL ', the second image light DR is converted into the second polarized image light DR'; on the contrary, when the first image light DL is converted into the second polarized image light DR ', the second image light DR is converted into the first polarized image light DL'.
As shown in fig. 3, in the first embodiment of the present invention, the base 61 has a plane 612, and each of the micro-curved mirrors 62 is a concave mirror and is arranged on the plane 612.
In a second embodiment of the present invention, as shown in fig. 9, the base 61 has a curved surface 611, and each of the micro-curved mirrors 62 is a concave mirror and is arranged on the curved surface 611.
In a third embodiment of the present invention, as shown in fig. 10, the base 61 has a flat surface 612, and each of the micro-mirrors 62 is a convex mirror and is arranged on the flat surface 612.
As shown in fig. 11, in the fourth embodiment of the present invention, the base 61 has a curved surface 611, and each of the micro-curved mirrors 62 is a convex mirror and is arranged on the curved surface 611.
As shown in fig. 12, in the fifth embodiment of the present invention, a windshield 70 is further provided, the reflective diffusion sheet 60 reflects the first polarized image light DL 'and the second polarized image light DR' to the windshield 70, and the first polarized image light DL 'and the second polarized image light DR' are refracted to the first eye receiving range LA and the second eye receiving range RA through the windshield 70. Because the polarization state of light changes as it is reflected and refracted at the interface of two isotropic dielectrics. The reflected light and the refracted light have partial polarization, and the light vibration (S-wave) perpendicular to the incident surface is more than the parallel vibration (P-wave) in the reflected light, whereas the refracted light is opposite. Therefore, the reflection amount of the P wave is small and the reflection amount of the S wave is large on the windshield 70, which causes the brightness of the image received by both eyes of the user to be different, and affects the picture quality.
As shown in fig. 13, in the sixth embodiment of the present invention, there is a windshield 70, and a quarter-wave plate 80 is further disposed behind the polarizer 40, the quarter-wave plate is a phase retardation plate and is made of a birefringent material, and the optical property of birefringence is that when light enters, the light is refracted in two different directions. The waveplate is usually made of quartz crystal (SiO2) because it has a high transparency over a large wavelength range and has a high optical quality. Still other materials (for other wavelength ranges) may be used, such as calcite (CaCO3), magnesium fluoride (MgF2), sapphire (Al2O3), mica (a silica material), and birefringent polymers, among others. The quarter-wave plate 80 controls the material and the thickness to make the light pass through the quarter-wave plate 80, and then the two lights with different polarization directions generate 1/4 wavelength phase difference. The quarter wave plate 80 has a so-called "optical axis" according to the material, and when a linearly polarized light is incident, its vibration is decomposed into two directions of vibration: one of the directions is the direction of the optical axis (fast axis) and becomes an ordinary wave (o-ray), and the other direction is the direction perpendicular to the optical axis (slow axis) and becomes an extraordinary wave (e-ray). In the embodiment, the quarter-wave plate 80 is disposed between the reflector module 50 and the reflective diffusion sheet 60, so that the first polarized image light DL 'and the second polarized image light DR' reflected by the reflector module 50 penetrate through the quarter-wave plate 80 to the reflective diffusion sheet 60, and are reflected by the reflective diffusion sheet 60 to the windshield 70, and then the first polarized image light DL 'and the second polarized image light DR' are reflected by the windshield 70 to the first eye receiving range LA and the second eye receiving range RA, and the first polarized image light DL 'and the second polarized image light DR' are converted into circularly polarized light through the quarter-wave plate 80 by matching the designed optical axis angle. The circularly polarized light can be decomposed into components in the directions of the P-polarization direction image light and the S-polarization direction image light, which have the same amplitude. The circularly polarized first polarized image light DL 'and the circularly polarized second polarized image light DR' have the same brightness because the reflection of the windshield 70 has the same effect. Finally, the user receives the first polarized image light DL 'and the second polarized image light DR' with the same brightness to generate a stereoscopic image without affecting the picture quality, however, the optical paths of the first polarized image light DL 'and the second polarized image light DR' are different, so the attenuation of the whole optical path is different, and the first polarized image light DL 'and the second polarized image light DR' are converted into elliptical polarized light through the quarter-wave plate 80 by adjusting the angle of the optical axis of the quarter-wave plate 80. Elliptically polarized light may also be decomposed into components in the P-wave and S-wave directions, but with different amplitudes. The difference between the reflection amounts of the windshield 70 for the P-wave and the S-wave can be added to compensate the difference of the total optical path attenuation amount, so that the first and second polarized second image lights DL 'and DR' received by the end user have the same brightness.
As shown in fig. 14, in the seventh embodiment of the present invention, a windshield 70 and a quarter-wave plate 80 are provided, and a concave mirror 90 is further provided, the reflective diffusion sheet 60 reflects the first polarized image light DL 'and the second polarized image light DR' to the concave mirror 90, the first polarized image light DL 'and the second polarized image light DR' are reflected to the windshield 70 through the concave mirror 90, and then reflected to the first eye receiving range LA and the second eye receiving range RA from the windshield 70, and the designed optical axis angle is matched, so that the first polarized image light and the second polarized image light are converted into circularly polarized light through the quarter-wave plate 80. The circularly polarized light can be decomposed into components in the directions of the P-polarization direction image light and the S-polarization direction image light, which have the same amplitude. The circularly polarized first polarized image light DL 'and the circularly polarized second polarized image light DR' have the same brightness because the influence of the reflection of the front windshield is the same. Finally, the user receives the first polarized image light DL 'and the second polarized image light DR' with the same brightness to generate a three-dimensional image without affecting the picture quality, however, the optical paths of the first polarized image light DL 'and the second polarized image light DR' are different, so the attenuation of the whole optical path is different, and the first polarized image light DL 'and the first polarized image light DR' are converted into elliptical polarized light through the quarter-wave plate by adjusting the angle of the optical axis of the quarter-wave plate group 80. Elliptically polarized light may also be decomposed into components in the P-wave and S-wave directions, but with different amplitudes. The difference of the reflection amount of the front windshield to the P wave and the S wave can be added, so that the difference of the whole light path attenuation amount can be compensated, and the brightness of the first polarized image light DL 'and the second polarized image light DR' received by the end user is consistent.
As shown in fig. 15, in the eighth embodiment of the present invention, the polarizer 40 transmits the first polarized image light DL ' and reflects the second polarized image light DR ', the mirror module 50 reflects the first polarized image light DL ' and transmits through the polarizer 40, and the reflective diffusion sheet 60 reflects the first polarized image light DL ' and the second polarized image light DR ' to the first eye receiving range LA and the second eye receiving range RA. In the eighth embodiment, the base 61 of the reflective diffusion sheet 60 is a plane, and each of the micro-curved mirrors 62 is a concave mirror, but the base 61 may be a curved surface, or the micro-curved mirror 62 may be a convex mirror.
As shown in fig. 16, in the ninth embodiment of the present invention, the polarizer 40 transmits the first polarized image light DL ' and reflects the second polarized image light DR ', the mirror module 50 reflects the first polarized image light DL ' and transmits through the polarizer 40, and the reflective diffusion sheet 60 reflects the first polarized image light DL ' and the second polarized image light DR ' to the first eye receiving range LA and the second eye receiving range RA. In the ninth embodiment, the base 61 of the reflective diffusion sheet 60 is a curved surface, and each of the micro-curved mirrors 62 is a convex mirror, but not limited thereto, the base 61 may be a flat surface, or the micro-curved mirror 62 may be a concave mirror.
As shown in fig. 17, in the tenth embodiment of the present invention, the windshield 70 is provided, the polarizer 40 transmits the first polarized image light DL ' and reflects the second polarized image light DR ', the mirror module 50 reflects the first polarized image light DL ' and transmits the polarizer 40, the reflective diffusion sheet 60 reflects the first polarized image light DL ' and the second polarized image light DR ' to the windshield 70, and the windshield 70 reflects the first polarized image light DL ' and the second polarized image light DR ' to the first eye receiving range LA and the second eye receiving range RA.
As shown in fig. 18, in the eleventh embodiment of the present invention, the windshield 70 and the quarter-wave plate 80 are provided, the polarizer 40 transmits the first polarized image light DL ' and reflects the second polarized image light DR ', the mirror module 50 reflects the first polarized image light DL ' and penetrates the polarizer 40, the quarter-wave plate 80 transmits the first polarized image light DL ' and the second polarized image light DR ' to the reflective diffusion sheet 60, the reflective diffusion sheet 60 reflects the first polarized image light DL ' and the second polarized image light DR ' to the windshield 70, and the windshield 70 reflects the first polarized image light DL ' and the second polarized image light DR ' to the first eye receiving range LA and the second eye receiving range RA.
As shown in fig. 19, in the twelfth embodiment of the present invention, the windshield 70, the quarter-wave plate 80 and the concave mirror 90 are provided, the polarizer 40 transmits the first polarized image light DL ' and reflects the second polarized image light DR ', the mirror module 50 reflects the first polarized image light DL ' and penetrates the polarizer 40, the quarter-wave plate 80 transmits the first polarized image light DL ' and the second polarized image light DR ' to the reflective diffusion sheet 60, the reflective diffusion sheet 60 reflects the first polarized image light DL ' and the second polarized image light DR ' to the concave mirror 90, the concave mirror 90 reflects the first polarized image light DL ' and the second polarized image light DR ' to the windshield 70, and the windshield reflects the first polarized image light DL ' and the second polarized image light DR ' to the first eye receiving range LA and the second eye receiving range RA.
As shown in fig. 20, in the thirteenth embodiment of the present invention, the projection apparatus for projecting a stereoscopic image mainly comprises a first projection module 20A, a second projection module 20B and a reflective diffuser 60, wherein:
the first projection module 20A projects the first image light DL;
the second projection module 20B projects the second image light DR;
the reflective diffuser 60 has a planar base 61 and a plurality of micro-curved mirrors 62 disposed on the base 61, wherein the micro-curved mirrors 62 diffuse the first image light DL to the first eye receiving range LA, and the micro-curved mirrors 62 diffuse the second image light DR to the second eye receiving range RA. In the thirteenth embodiment, the base 61 of the reflective diffusion sheet 60 is a plane, and each of the micro-mirrors 62 is a concave mirror, but not limited thereto, the base 61 may be a curved surface, or the micro-mirror 62 may be a convex mirror.
Since the first projection module 20A and the second projection module 20B separately project the first image light DL and the second image light DR, compared to the first embodiment of the present invention, the thirteenth embodiment of the present invention greatly reduces the required components, and also achieves the effect of projecting stereoscopic images.
As shown in fig. 21, the fourteenth embodiment of the present invention is based on the change of the structural configuration of the thirteenth embodiment, in the fourteenth embodiment of the present invention, the base 61 of the reflective diffusion sheet 60 is a curved surface, and each of the micro-curved mirrors 62 is a convex mirror. In the fourteenth embodiment, the base 61 of the reflective diffusion sheet 60 is a curved surface, and each of the micro-curved mirrors 62 is a convex mirror, but not limited thereto, the base 61 may be a flat surface, or the micro-curved mirror 62 may be a concave mirror.
As shown in fig. 22, in the fifteenth embodiment of the present invention, based on the change of the structural configuration of the thirteenth embodiment, in the fifteenth embodiment of the present invention, a windshield 70 is further provided, and the reflective diffusion sheet 60 reflects the first image light DL and the second image light DR to the windshield 70, and then reflects the first image light DL and the second image light DR to the first eye receiving range LA and the second eye receiving range RA through the windshield 70.
As shown in fig. 23, in the sixteenth embodiment of the present invention, based on the change of the structural configuration of the thirteenth embodiment, in the sixteenth embodiment of the present invention, a windshield 70 and a concave mirror 90 are further provided, the reflective diffusion sheet 60 reflects the first image light DL and the second image light DR to the concave mirror 90, then reflects the first image light DL and the second image light DR to the windshield 70 through the concave mirror 90, and finally reflects the first image light DL and the second image light DR to the first eye receiving range LA and the second eye receiving range RA through the windshield 70.
It should be noted that, as shown in fig. 24, when visible light is incident on the interface of the glass from air, the reflection amount of the P-wave gradually decreases as the incident angle increases, until the P-wave is completely refracted and not reflected at the brewster angle, and only the S-wave remains in the reflected wave at this time, and the angle between the reflected ray and the refracted ray is 90 degrees. The brewster angle can be derived from the refractive indices of the two media, and if the refractive index of the first medium is n1 and the refractive index of the second medium is n2, the brewster angle θ B is arctan (n2/n 1). As shown in fig. 25, when the first medium is air with a refractive index of 1 and the second medium is glass with a refractive index of 1.5, the brewster angle can be seen from the reflection intensity measurement curve of the P-wave and the S-wave at different incident angles, and the reflection amount of the P-wave is 0 at this incident angle.
Specifically, as shown in fig. 26 and 27, when the polarized light incident into the quarter-wave plate 80 is parallel or perpendicular to the optical axis (at an angle of 0 degree or 90 degrees with respect to the optical axis), the original linearly polarized light is maintained because the amplitude in the other direction is zero, i.e., the polarized light is not split into two directions. As shown in fig. 28, when the angle between the polarized light and the optical axis is 45 degrees, the decomposed amplitudes in the two directions are equal, and a quarter of the generated phase difference is added, so that after the waves in the two directions of the fast axis and the slow axis are combined, a wave whose vibration direction is rotated, that is, so-called circularly polarized light, is generated; however, if the angle is other, the two directions of the decomposed amplitudes are different, and the two directions of the decomposed amplitudes become elliptically polarized light. As shown in fig. 29, the circularly polarized light or the elliptically polarized light may be incident on the quarter-wave plate 80 and may be converted into linearly polarized light in the original direction.
Accordingly, the first polarization direction image light and the second polarization direction image light respectively reach the reflective diffusion sheet at different optical paths and angles, so that the left eye receives the first polarization image light DL 'or the first image light DL, and the right eye receives the second polarization image light DR' or the second image light DR, so that a user can generate an effect of a naked-eye stereoscopic image without wearing any accessory, and each micro-curved mirror 62 can be designed to have a reflection angle meeting requirements, so that the directivity of the reflective diffusion sheet 60 has very high degree of freedom.
In summary, the above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (18)
1. A projection apparatus for projecting stereoscopic images, comprising:
a projection module for alternately projecting the first image light and the second image light;
an ultrafast polarization modulator for converting the first image light and the second image light into a first polarized image light and a second polarized image light, wherein the first polarized image light and the second polarized image light are light rays with polarization directions perpendicular to each other;
a polarizer reflecting the first polarized image light and transmitting the second polarized image light;
the reflector module reflects the first polarized image light and the second polarized image light; and
the reflective diffusion sheet is provided with a plurality of groups of micro-curved mirrors, the micro-curved mirrors diffuse the first polarized image light to a first eye receiving range, and the micro-curved mirrors diffuse the second polarized image light to a second eye receiving range.
2. The projection apparatus for projecting stereoscopic images as claimed in claim 1, wherein when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light.
3. The projection apparatus for projecting stereoscopic images according to claim 1, wherein when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light.
4. The projection apparatus for projecting stereoscopic images as claimed in claim 1, wherein the polarizer is a reflective polarizer or a polarizing beam splitter.
5. The projection apparatus for projecting stereoscopic images according to claim 1, further comprising a windshield, wherein the reflective diffuser diffuses the first polarized image light and the second polarized image light to the windshield and reflects the first polarized image light and the second polarized image light to the first eye receiving range and the second eye receiving range.
6. The projection apparatus for projecting stereoscopic images according to claim 5, further comprising a quarter-wave plate disposed behind the polarizer, wherein the first polarized image light and the second polarized image light are converted into circularly polarized light or elliptically polarized light by the quarter-wave plate, and then the first polarized image light and the second polarized image light are transmitted to the reflective diffusion sheet.
7. A projection apparatus for projecting stereoscopic images as claimed in claim 5 or 6, further comprising a concave mirror disposed between the windshield and the reflective diffuser.
8. The projection apparatus for projecting stereoscopic images as claimed in claim 1, wherein the reflector module has a first reflector set and a second reflector set, the first reflector set reflects the first polarized image light to the reflective diffuser, and the second reflector set reflects the second polarized image light to the reflective diffuser.
9. A projection apparatus for projecting stereoscopic images, comprising:
a projection module for alternately projecting the first image light and the second image light;
an ultrafast polarization modulator for converting the first image light and the second image light into a first polarized image light and a second polarized image light, wherein the first polarized image light and the second polarized image light are light rays with polarization directions perpendicular to each other;
a polarizer transmitting the first polarized image light and reflecting the second polarized image light;
the reflector module reflects the first polarized image light and penetrates through the polarizer; and
the reflective diffusion sheet is provided with a plurality of groups of micro-curved mirrors, the micro-curved mirrors diffuse the first polarized image light to a first eye receiving range, and the micro-curved mirrors diffuse the second polarized image light to a second eye receiving range.
10. The projection apparatus for projecting stereoscopic images as claimed in claim 9, wherein when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light.
11. The projection apparatus for projecting stereoscopic images as claimed in claim 9, wherein when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light.
12. The projection apparatus for projecting stereoscopic images as claimed in claim 9, wherein the polarizer is a reflective polarizer.
13. The projection apparatus for projecting stereoscopic images according to claim 9, further comprising a windshield, wherein the reflective diffuser reflects and diffuses the first polarized image light and the second polarized image light to the windshield and reflects the first eye receiving range and the second eye receiving range.
14. The projection apparatus for projecting stereoscopic images according to claim 13, further comprising a quarter-wave plate disposed behind the polarizer, wherein the first polarized image light and the second polarized image light are converted into circularly polarized light or elliptically polarized light by the quarter-wave plate, and then the first polarized image light and the second polarized image light are transmitted to the reflective diffusion sheet.
15. A projection apparatus for projecting stereoscopic images as claimed in claim 13 or 14, further comprising a concave mirror disposed between the windshield and the reflective diffuser.
16. A projection apparatus for projecting stereoscopic images, comprising:
a first projection module projecting a first image light;
a second projection module projecting a second image light;
the reflective diffusion sheet is provided with a plurality of groups of micro-curved mirrors, the micro-curved mirrors diffuse the first image light to a first eye receiving range, and the micro-curved mirrors diffuse the second image light to a second eye receiving range.
17. The projection apparatus for projecting stereoscopic images according to claim 16, further comprising a windshield, wherein the reflective diffuser reflects and diffuses the first polarized image light and the second polarized image light to the windshield and reflects the first eye receiving range and the second eye receiving range.
18. The projection apparatus for projecting stereoscopic images as claimed in claim 17, further comprising a concave mirror disposed between the windshield and the reflective diffuser.
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| CN202010350657.6A CN113568267A (en) | 2020-04-28 | 2020-04-28 | Projection device for projecting stereo image |
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| CN202010350657.6A CN113568267A (en) | 2020-04-28 | 2020-04-28 | Projection device for projecting stereo image |
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