CN118118634A - Naked eye 3D projection system - Google Patents
Naked eye 3D projection system Download PDFInfo
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- CN118118634A CN118118634A CN202211522728.1A CN202211522728A CN118118634A CN 118118634 A CN118118634 A CN 118118634A CN 202211522728 A CN202211522728 A CN 202211522728A CN 118118634 A CN118118634 A CN 118118634A
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- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000003384 imaging method Methods 0.000 claims abstract description 14
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 8
- 239000011521 glass Substances 0.000 abstract description 7
- 238000009792 diffusion process Methods 0.000 description 12
- 230000004888 barrier function Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Classifications
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- 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]
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- 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
- G02B30/26—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 autostereoscopic type
- G02B30/27—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 autostereoscopic type involving lenticular arrays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
- H04N13/305—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using lenticular lenses, e.g. arrangements of cylindrical lenses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
- H04N13/31—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers
-
- 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
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
The invention provides a naked eye 3D projection system, which relates to the technical field of 3D display, and the naked eye 3D projection system comprises: an image generation device PGU for outputting an image to be projected; the first beam splitting lens array grating is arranged on the light emitting side of the PGU and used for carrying out beam splitting treatment on light rays emitted by the PGU when the PGU outputs an image to be projected; the optical focusing module is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for enabling light transmitted by the first beam-splitting lens array grating to penetrate through the beam-splitting lens array grating and enabling the transmitted light to be converged and transmitted; and the second beam splitting lens array grating is arranged on the light emitting side of the optical focusing module and used for splitting the light transmitted through the optical focusing module, and the image to be projected can be imaged at an imaging surface position which is spaced from the second beam splitting lens array grating by a preset distance. When the naked eye 3D projection system is used, the liquid crystal shutter glasses do not need to be worn, the use is convenient, ghost images or stereoscopic vision errors are avoided, and the projection effect is good.
Description
Technical Field
The invention relates to the technical field of 3D display, in particular to a naked eye 3D projection system.
Background
The 3D display technology is currently popular in many home projectors, but generally needs to wear a pair of liquid crystal shutter glasses, the left and right eye images are switched based on time sequence by the 3D projector, the liquid crystal shutter is switched synchronously, when the left eye image signal is projected onto the screen, the liquid crystal shutter of the left eye is opened, and the liquid crystal shutter of the right eye is closed, so that the viewer can only see the image by the left eye. Similarly, only the right eye screen projected by the projector will be visible to the right eye at the next time. Thus, if the switching speed is fast enough, such as a frequency greater than or equal to 120Hz, to ensure that each eye sees a respective 60Hz picture refresh rate, then a stereoscopic view can be created without too much flicker.
But 3D projectors based on liquid crystal shutters have the following drawbacks: 1. the liquid crystal shutter glasses are required to be worn, so that the weight is large, and the wearing is uncomfortable; 2. frequency interference is easy to form with the surrounding environment, and the glasses are perceived to shake between light and shade; 3. if the shutter synchronization does not exactly match the frequency at which the projector projects different eye pictures, ghost or stereoscopic errors can occur.
It has been proposed to use at least two projectors and then match with a specially manufactured screen to form a naked eye 3D projection system, but the cost of adopting two or more projectors is high, and the naked eye 3D projection system is too large and heavy due to the multiple projectors, and the alignment between the multiple projectors is a complex process, so that the naked eye 3D projection system is very inconvenient to use.
Disclosure of Invention
The embodiment of the invention provides a naked eye 3D projection system, which is used for solving the problems that when an existing 3D projector with a liquid crystal shutter is used, the use of the liquid crystal shutter glasses is inconvenient and the projection effect is poor.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
The embodiment of the invention provides a naked eye 3D projection system, which comprises:
the device comprises an image generating device PGU, a first beam splitting lens array grating, an optical focusing module and a second beam splitting lens array grating;
the PGU is used for outputting an image to be projected;
The first beam splitting lens array grating is arranged on the light emitting side of the PGU, and is used for performing beam splitting treatment on light rays emitted when the PGU5 outputs an image to be projected, so that the light rays corresponding to different pixel units of the image to be projected are transmitted towards different directions after passing through the first beam splitting lens array grating;
the optical focusing module is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for enabling light transmitted by the first beam-splitting lens array grating to penetrate and enabling the penetrated light to be converged and transmitted;
The second beam splitting lens array grating is arranged on the light emitting side of the optical focusing module and is used for carrying out beam splitting treatment on the light passing through 0 of the optical focusing module, so that the light corresponding to different pixel units of the image to be projected can be transmitted towards different directions after passing through the second beam splitting lens array grating, and imaging can be carried out at the position of an imaging surface with a preset distance between the second beam splitting lens array grating and the second beam splitting lens array grating.
Optionally, the optical focusing module includes: a projection lens and a focusing lens array grating;
The projection lens is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for transmitting the light transmitted by the 5 th beam-splitting lens array grating;
the focusing lens array grating is arranged on the light emitting side of the projection lens and is used for converging and transmitting light transmitted by the projection lens.
Optionally, a focal plane of the first beam splitting lens array grating is located on a pixel plane of the PGU.
Optionally, the focusing lens array grating is located at a first plane;
And 0, the first plane is an imaging plane of a real image formed by the light transmitted by the projection lens.
Optionally, the focal point of the second beam splitting lens array grating is consistent with the focal point of the focusing lens array grating.
Optionally, the focal length of the second beam splitting lens array grating is smaller than the focal length of the focusing lens array grating.
5 Optionally, the aperture width of each focusing lens in the focusing lens array grating is consistent with the real image size amplified by the projection lens.
Optionally, the aperture width of the focusing lens in the focusing lens array grating is identical to the aperture width of the beam splitting lens in the second beam splitting lens array grating.
Optionally, the number of focusing lenses in the focusing lens array grating is smaller than the number of beam splitting lenses in the second beam splitting lens array grating.
The beneficial effects of the invention are as follows:
The invention provides a naked eye 3D projection system, which comprises an image generating device PGU for outputting an image to be projected, a first beam splitting lens array grating arranged on the light emitting side of the PGU, an optical focusing module arranged on the light emitting side of the first beam splitting lens array grating, and a second beam splitting lens array grating arranged on the light emitting side of the optical focusing module, wherein the first beam splitting lens array grating is used for carrying out beam splitting treatment on light rays emitted when the PGU outputs the image to be projected, so that the light rays corresponding to different pixel units of the image to be projected are transmitted towards different directions after passing through the first beam splitting lens array grating, the transmitted light rays can be converged and transmitted by the first beam splitting lens array grating, the second beam splitting lens array grating is used for carrying out beam splitting treatment on the light rays transmitted by the optical focusing module, so that the light rays corresponding to different pixel units of the image to be projected are transmitted towards different directions after passing through the second beam splitting lens array grating, the light rays corresponding to the different pixel units of the image to be projected can be transmitted towards different directions, the light rays can be transmitted towards different directions after passing through the second beam splitting lens array grating, the light rays corresponding to the different pixel units to the image splitting lens array grating can be transmitted into different directions, and the light beams, and the liquid crystal array can be transmitted into different directions, and the image with different directions, and the image lens array can have the same stereo lens system, and the stereoscopic vision system.
Drawings
FIG. 1 is a schematic view of a basic light path of a projector according to the present invention;
fig. 2 shows one of schematic structural diagrams of an naked eye 3D projection system according to an embodiment of the present invention;
Fig. 3 shows a second schematic structural diagram of a naked eye 3D projection system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments thereof in order to make the objects, technical solutions and advantages of the present invention more apparent.
Before the description of the specific embodiments, the following description is first made:
As shown in fig. 1, the image source of the projector may be different implementations such as a light-emitting diode (LED), a liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and digital light Processing (DIGITAL LIGHT Processing, DLP), which are all unified and abstracted as an image generating device (Picture Generation Unit, PGU), and many tiny cell structures capable of emitting light on the PGU are called pixels, and a combined projection lens used on the projector is generally abstracted as a projection lens (which may be a single lens or a combined lens in practical applications). Thus, as can be seen from fig. 1, the basic optical path of the projector is an optical path through which the real image is formed by the convex lens. The light emitted by the pixels on the PGU is refracted by the projection lens, and an enlarged real image formed by the pixels is obtained on the projection screen. If the screen is reflective, the viewer can only see the projected image on the same side as the projector, and if the screen is permeable to the optical fibers, the projected image can also be seen on the other side of the projector.
The invention provides a naked eye 3D projection system, aiming at the problems that when a 3D projector using the existing liquid crystal shutter is used, the use of the liquid crystal shutter glasses is inconvenient to wear and the projection effect is poor.
As shown in fig. 2, an embodiment of the present invention provides a naked eye 3D projection system, including:
the device comprises an image generating device PGU, a first beam splitting lens array grating, an optical focusing module and a second beam splitting lens array grating;
the PGU is used for outputting an image to be projected;
the first beam splitting lens array grating is arranged on the light emitting side of the PGU and is used for carrying out beam splitting treatment on light rays emitted by the PGU when outputting an image to be projected, so that the light rays corresponding to different pixel units of the image to be projected are transmitted towards different directions after passing through the first beam splitting lens array grating;
the optical focusing module is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for enabling light transmitted by the first beam-splitting lens array grating to penetrate and enabling the penetrated light to be converged and transmitted;
The second beam splitting lens array grating is arranged on the light emitting side of the optical focusing module and is used for carrying out beam splitting treatment on the light transmitted through the optical focusing module, so that the light corresponding to different pixel units of the image to be projected is transmitted towards different directions after transmitted through the second beam splitting lens array grating, and the imaging surface position with the second beam splitting lens array grating at a preset distance can be imaged.
It should be noted that, when designing an open hole 3D projection system, a light splitting device such as a parallax barrier array grating or a microlens array grating needs to be placed in a suitable position. Since the projection system emphasizes the brightness of the stream, and the light intensity loss is relatively large during the projection of the optical path, the microlens array grating is more suitable. The parallax barrier grating or the microlens array grating may be a one-dimensional array grating with only one horizontal dimension, or may be a two-dimensional array grating for integrated imaging, which is the same in principle and may be collectively referred to as an array grating.
Preferably, in the embodiment of the present invention, the first beam splitting lens array grating and the second beam splitting lens array grating are microlens array gratings. As another embodiment of the present invention, the first beam splitter lens array grating may be replaced by a parallax barrier array grating, but the parallax barrier array grating has a larger loss of light efficiency than the microlens array grating.
In the naked eye 3D projection system shown in fig. 2, the PGU may be an image generating device such as an LED, LCOS, or an Organic Light-Emitting Diode (OLED), first, a first beam-splitting lens array grating is disposed between the PGU and the optical focusing module, where the first beam-splitting lens array grating is used to guide Light emitted from pixel units filled with images to be projected according to different viewpoints on the PGU screen to a specific viewing area, and specifically, light emitted from one pixel unit may form a viewing area with parallax in different directions of Light emission.
The size of the beam-splitting lens in the first beam-splitting lens array grating can be designed according to the distance between a plurality of viewpoints and a viewing distance, the width of a viewing area and the like, and the width of the beam-splitting lens can be obtained according to the design of the naked eye 3D beam-splitting lens array grating.
An optical focusing module is arranged on the light emitting side of the first beam splitting lens array grating, and light transmitted by the first beam splitting lens array grating is transmitted through the optical focusing module, and the transmitted light can be converged and transmitted to form a more accurate real image.
The light converged by the optical focusing module continues to propagate, and a second beam splitting lens array grating is continuously placed in the light propagation direction, so that the effect of the second beam splitting lens array grating is to enlarge the undersize divergence angle of the light continuously propagated after the light emitted by the pixel unit is converged by the optical focusing module, and therefore imaging can be carried out on the imaging surface position with the second beam splitting lens array grating at a preset distance, the preset distance is a longer distance, and after the light is conducted by the optical devices, the PGU is filled with the light emitted by the pixel units of the images to be projected with different viewpoints, and a viewing area of naked eyes 3D is formed.
The naked eye 3D projection system is used by a user, the user does not need to wear liquid crystal shutter glasses, the use is convenient, ghost images or stereoscopic vision errors are avoided, and the projection effect is good.
Specifically, the optical focusing module includes: a projection lens and a focusing lens array grating;
the projection lens is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for transmitting light transmitted by the first beam-splitting lens array grating;
the focusing lens array grating is arranged on the light emitting side of the projection lens and is used for converging and transmitting light transmitted by the projection lens.
That is, a projection lens is provided on the light-emitting side of the first lenticular lens array for transmitting the light transmitted from the first lenticular lens array, and the optimum position of the specific viewing area distribution for guiding the light emitted from the pixel unit by the first lenticular lens array is located at the position of the projection lens.
The focal plane of the first beam splitting lens array grating is located on the pixel plane of the PGU.
A focusing lens array grating is placed on one side of the projection lens, where the light is projected, preferably, the focusing lens array grating is a micro lens array grating, and the real image formed by each beam splitting lens on the first beam splitting lens array grating is not an ideal image due to the aberration of the projection lens, and the focusing lens array grating further converges the light projected to the real image point to form a more accurate real image.
In addition, in the embodiment of the present invention, the aperture width of the focusing lens in the focusing lens array grating is required to be consistent with the real image size after the projection lens magnifies and projects the pixel unit on the PGU screen.
The focusing lens array grating is positioned at an imaging surface (i.e. a first plane) of the real image after the light rays transmitted by the first beam splitting lens array grating pass through the projection lens.
Further, as shown in fig. 2, the light converged by the focusing lens array grating continues to propagate, and a second beam splitting lens array grating is continuously placed in the light propagation direction, so that the second beam splitting lens array grating is used for expanding the light emitted from different pixel units on the PGU, and the light is projected by the projection lens and then converged by the focusing lens array grating, and then continues to propagate at an excessively small divergence angle, so that the imaging surface position at a preset distance from the second beam splitting lens array grating is imaged.
The focal point of the second beam splitting lens array grating is consistent with the focal point of the focusing lens array grating, but the focal length of the second beam splitting lens array grating is shorter, that is, the focal length of the second beam splitting lens array grating is smaller than the focal length of the focusing lens array grating (the smaller the focal length is, the stronger the lens refractive power of the second beam splitting lens array grating is, the larger the viewing angle can be enlarged), the aperture width of the focusing lens in the focusing lens array grating is equal to the aperture width of the beam splitting lens in the second beam splitting lens array grating, but the number of the focusing lenses in the focusing lens array grating is not consistent with the number of the beam splitting lenses in the second beam splitting lens array grating, and only the number of the focusing lenses in the focusing lens array grating is smaller than the number of the beam splitting lenses in the second beam splitting lens array grating, so that each focusing lens in the focusing lens array grating can be guaranteed to have a beam splitting lens in the second beam splitting lens array grating corresponding to the focusing lens array grating, and one focusing lens and one beam splitting lens are combined together to form a kepler beam expansion structure.
Through the design of the light splitting device, the naked eye 3D projection system structure based on the single projector can be obtained, the cost is reduced, and the use is convenient. The naked eye 3D projection system can be used as a common 3D projector to obtain a large-size naked eye 3D Display effect, and can be miniaturized to be used as an image generation unit of a Head Up Display (HUD) system of an automobile. For example, the HUD based on LCOS can be used for replacing the whole image generating unit which utilizes LCOS and projects the LCOS onto a diffusion screen with the naked eye 3D projection system in the embodiment of the invention, and then the original HUD curved mirror design is kept unchanged, so that the HUD of the naked eye 3D can be obtained.
As shown in fig. 3, the embodiment of the present invention further provides another naked eye 3D projection system, where the naked eye 3D projection system shown in fig. 3 includes a PGU for outputting an image to be projected, a projection lens disposed on a light emitting side of the PGU, a focusing lens array grating disposed on the light emitting side of the projection lens, a diffusion screen disposed on the light emitting side of the focusing lens array grating, and a beam splitting lens array grating disposed on the light emitting side of the diffusion screen.
The position of the focusing lens array grating is at the imaging surface of the PGU panel, the imaging surface is formed by the light rays emitted by the pixel units on the PGU panel after passing through the projection lens, the real image formed by the light rays emitted by the pixels on the PGU panel cannot be an ideal image point due to the aberration of the projection lens, and the focusing lens is used for further converging the light rays projected to the real image point to form a more accurate real image point. In addition, the cell width of the focusing lens array is required to be consistent with the real image size of the PGU screen pixels after enlarged projection by the projection lens.
A diffusion screen is arranged on one side of the focusing lens array grating far away from the projection lens, the diffusion screen is positioned on the converging point of the light converged by the focusing lens, and the position of the converging point is in the focal length as the distance between the projection lens and the focusing lens array is generally quite far, so that the collected incident light is equivalent to parallel light for each focusing lens unit. Therefore, the position of the diffusion screen can be placed on the focal plane of the focusing lens array grating, so that a more ideal real image plane is collected on one side of the diffusion screen, and the real image plane is the real image formed by the screen of the PGU.
Due to the divergent effect of the diffusion screen, an isotropic light-emitting real image plane can be obtained on one side of the diffusion screen principle focusing lens array, which is equivalent to obtaining a large-size light-emitting screen, and then a beam-splitting lens array grating is placed, which has the same effect as a beam-splitting lens array grating adopted when a naked eye 3D display design is carried out based on a common LCD screen, and the size of the beam-splitting lens can be designed according to the distance between a plurality of viewpoints to be displayed and a viewing distance, the width of a viewing area and the like, but the focal length of the beam-splitting lens is exactly on the plane of one side of the diffusion screen far away from the focusing lens array grating. If the diffuser screen thickness is small enough, its thickness can be ignored, leaving the focal plane of the beam-splitting lens coincident with the focal plane of the focusing lens.
The whole system is equivalent to forming an isotropic luminous screen on the projected diffusion screen, and the pixels of the screen are not overlapped and are regularly arranged like the pixel array on the common LCD screen. The subsequent split lens array grating is equivalent to a split lens array grating obtained by performing naked eye 3D design on the real image screen, and since the content of the split lens array grating is well known in the naked eye 3D display industry, a detailed description is omitted here.
It should be noted that, in the present embodiment, the beam splitter lens array grating may be replaced by a parallax barrier grating, but too much light efficiency is lost by using the parallax barrier grating.
In the naked eye 3D projection system shown in fig. 3, some light efficiency is lost due to the diffusion screen, compared to the naked eye 3D projection system shown in fig. 2.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present invention, and such modifications and changes are intended to be within the scope of the present invention.
Claims (9)
1. A naked eye 3D projection system, comprising:
the device comprises an image generating device PGU, a first beam splitting lens array grating, an optical focusing module and a second beam splitting lens array grating;
the PGU is used for outputting an image to be projected;
the first beam splitting lens array grating is arranged on the light emitting side of the PGU and is used for carrying out beam splitting treatment on light rays emitted by the PGU when outputting an image to be projected, so that the light rays corresponding to different pixel units of the image to be projected are transmitted towards different directions after passing through the first beam splitting lens array grating;
the optical focusing module is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for enabling light transmitted by the first beam-splitting lens array grating to penetrate and enabling the penetrated light to be converged and transmitted;
The second beam splitting lens array grating is arranged on the light emitting side of the optical focusing module and is used for carrying out beam splitting treatment on the light transmitted through the optical focusing module, so that the light corresponding to different pixel units of the image to be projected is transmitted towards different directions after transmitted through the second beam splitting lens array grating, and the imaging surface position with the second beam splitting lens array grating at a preset distance can be imaged.
2. The naked eye 3D projection system according to claim 1, wherein the optical focusing module comprises: a projection lens and a focusing lens array grating;
the projection lens is arranged on the light-emitting side of the first beam-splitting lens array grating and is used for transmitting light transmitted by the first beam-splitting lens array grating;
the focusing lens array grating is arranged on the light emitting side of the projection lens and is used for converging and transmitting light transmitted by the projection lens.
3. The naked eye 3D projection system according to claim 1, wherein the focal plane of the first split lens array grating is located on the pixel plane of the PGU.
4. The naked eye 3D projection system according to claim 2, wherein the focusing lens array grating is located at a first plane;
The first plane is an imaging plane of a real image formed by light rays transmitted by the projection lens.
5. The naked eye 3D projection system according to claim 2, wherein the focal point of the second beam splitting lens array grating coincides with the focal point of the focusing lens array grating.
6. The naked eye 3D projection system according to claim 2, wherein the focal length of the second beam splitting lens array grating is smaller than the focal length of the focusing lens array grating.
7. The naked eye 3D projection system according to claim 2, wherein the aperture width of each focusing lens in the focusing lens array grating is consistent with the real image size magnified by the projection lens.
8. The naked eye 3D projection system according to claim 2, wherein the aperture width of the focusing lens in the focusing lens array grating is identical to the aperture width of the beam splitting lens in the second beam splitting lens array grating.
9. The naked eye 3D projection system according to claim 2, wherein the number of focusing lenses in the focusing lens array grating is smaller than the number of beam splitting lenses in the second beam splitting lens array grating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211522728.1A CN118118634A (en) | 2022-11-30 | 2022-11-30 | Naked eye 3D projection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211522728.1A CN118118634A (en) | 2022-11-30 | 2022-11-30 | Naked eye 3D projection system |
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| CN118118634A true CN118118634A (en) | 2024-05-31 |
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| CN202211522728.1A Pending CN118118634A (en) | 2022-11-30 | 2022-11-30 | Naked eye 3D projection system |
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