CN112596334A - Transparent projection system capable of reducing secondary imaging - Google Patents
Transparent projection system capable of reducing secondary imaging Download PDFInfo
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- CN112596334A CN112596334A CN202011593038.6A CN202011593038A CN112596334A CN 112596334 A CN112596334 A CN 112596334A CN 202011593038 A CN202011593038 A CN 202011593038A CN 112596334 A CN112596334 A CN 112596334A
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- polarizer
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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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/604—Polarised screens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Projection Apparatus (AREA)
Abstract
本发明涉及一种可降低二次成像的透明投影系统，包括用于显示图像信息的透明投影屏幕以及用于将图像信息投射到所述透明投影屏幕上的投影机，还包括设于所述投影机与所述透明投影屏幕之间的光调制元件以及设于所述透明投影屏幕用于显示图像信息另一侧的第一偏光片，所述第一偏光片的透过轴具有第一偏振方向，光线通过所述光调制元件后具有第二偏振方向，所述第一偏振方向与所述第二偏振方向的夹角θ在0°≤θ＜90°的范围内自由调整。本申请可以通过调整光调制元件与透明投影屏幕后的第一偏光片的光透过轴之间的夹角，实现对位于透明投影屏幕后的图像进行透过、部分透过或基本屏蔽的灵活调整的技术效果。
The invention relates to a transparent projection system capable of reducing secondary imaging, comprising a transparent projection screen for displaying image information and a projector for projecting image information on the transparent projection screen, and further comprising: a light modulation element between the projector and the transparent projection screen and a first polarizer arranged on the other side of the transparent projection screen for displaying image information, the transmission axis of the first polarizer has a first polarization direction , the light has a second polarization direction after passing through the light modulation element, and the included angle θ between the first polarization direction and the second polarization direction is freely adjustable within the range of 0°≤θ<90°. In the present application, by adjusting the angle between the light modulation element and the light transmission axis of the first polarizer behind the transparent projection screen, the flexible transmission, partial transmission or basic shielding of the image behind the transparent projection screen can be realized. Adjusted technical effects.
Description
Technical Field
The present invention relates to projection systems, and more particularly to a transparent projection system capable of reducing secondary imaging.
Background
In recent years, with the rapid development of scientific technology, people have higher and higher acceptance of fresh things. Transparent projection displays are becoming more and more interesting to the market and to consumers as a new result in the field of projection displays. The transparent projection screen is a special projection screen which enables audiences to see scenery behind the screen through the screen and can see projected images on the screen clearly, and has the magical effect of magical imaging of suspended objects. The existing transparent projection screen technology is mainly a holographic projection film, and the film is formed by impressing microscopic pit points on a plastic substrate by using a precision processing technology, so that the transmission, reflection and scattering of incident projection light on the surface of the film are reasonably distributed, and the transparency of the film is required to be good.
The transparent screen is that part of light can be transmitted to objects behind through the screen, especially in a dark environment, because the light intensity of the projector is usually relatively large, part of light can penetrate through the transparent screen to form images on objects such as walls, and the whole effect of the transparent projection is affected. At present, the commonly adopted means mainly include increasing the brightness of the rear environment, adopting light-absorbing materials or adding some ornaments, but generally, the methods bring other problems under the condition of reducing secondary imaging. For example, increasing the brightness of the rear light can cause a reduction in the sharpness and contrast of the image on the transparent projection screen; the light absorption material is usually a dark black material, and the background is single; the decoration in turn causes a reduction in the imaging contrast. Therefore, how to reduce the secondary imaging without affecting the projection effect is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
The application mainly solves the problem of how to reduce the secondary imaging of the transparent projection screen, realizes the free adjustment of the projection image in a full-clear transmission mode, a partial transmission mode or a nearly full-dark state, and provides a novel transparent projection system.
In order to achieve the above object, the present application provides a transparent projection system capable of reducing secondary imaging, including a transparent projection screen for displaying image information and a projector for projecting the image information onto the transparent projection screen, further including a first polarizer arranged on the other side of the image information, wherein the first polarizer is arranged on the other side of the image information, and the transmission axis of the first polarizer has a first polarization direction, and the light passes through the second polarization direction behind the light modulation element, and the included angle θ between the first polarization direction and the second polarization direction is freely adjusted within the range of 0 ° θ < 90 °.
As a further improvement of the present application, the first polarizer is fixed to the back surface of the transparent projection screen.
As a further improvement of the present application, the fixing mode of the first polarizer is a back glue or a laminating glue mode.
As a further improvement of the present application, the light modulation element is a second polarizer, and the second polarizer can rotate in the plane of the second polarizer.
As a further improvement of the present application, the first polarizer and the second polarizer are linear polarizers, and the transmission axis directions of the first polarizer and the second polarizer are set to any non-perpendicular angle.
As a further improvement of the present application, the first polarizer and the second polarizer are circular polarizers, and the first polarizer and the second polarizer are set to any angle of non-chirality opposite.
As a further improvement of the present application, the second polarizer is fixed in a manner of a snap-in type or a screw-in type that facilitates adjustment of an angle of the second polarizer.
As a further improvement of this application, the structure of buckle formula including locate the snap ring on the projector camera lens, with snap ring assorted buckle, the second polaroid is located inside the buckle.
As a further improvement of the application, the clamping ring is provided with a handle for fixing the second polaroid.
As a further improvement of the present application, the light modulation element is a liquid crystal light valve, and an electrical connection port is provided on the liquid crystal light valve.
As a further development of the application, the transparent projection screen is a rigid transparent projection screen or a flexible transparent projection screen.
As a further improvement of the application, the rigid transparent projection screen is a transparent projection screen which is fixed by glass-sandwiched glue or a fixing frame.
As a further development of the application, the flexible transparent projection screen is a holographic film or a transparent optical projection film.
As a further improvement of the present application, the projector is a DLP projector, and the light modulation element is fixed on a lens of the DLP projector.
As a further improvement of the application, the projector is an LCD projector or an LCOS projector, and the light modulation element is fixed inside the LCD projector or the LCOS projector.
The technical effect of flexibly adjusting the transmission, partial transmission or basic shielding of the image behind the transparent projection screen can be realized by adjusting the included angle between the light modulation element and the light transmission axis of the first polarizer behind the transparent projection screen.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a transparent projection system capable of reducing secondary imaging;
FIG. 2 is a schematic diagram of a structure of an included angle change between a first polarizer and a second polarizer;
FIG. 3 is a schematic structural diagram of an embodiment of a fixing manner of a second polarizer on a projector;
FIG. 4 is a schematic diagram of another embodiment of a transparent projection system capable of reducing secondary imaging;
FIG. 5 is a schematic diagram of another embodiment of a transparent projection system capable of reducing secondary imaging;
in the figure: 1. a projector; 2. a first polarizer; 3. a transparent projection screen; 4. a second polarizer; 10. a projector lens; 11. a snap ring; 12. buckling; 13. a handle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the following description of the present application will be made in detail and completely with reference to the specific embodiments and the accompanying drawings. It should be understood that the described embodiments are only a few embodiments of the present application, not all embodiments, and are not intended to limit the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For a transparent projection screen, in order to realize the free adjustment of the projected image in completely clear transmission, partially transmission display or basically close to completely dark state, the application provides a transparent projection system capable of reducing secondary imaging, which comprises a transparent projection screen 3 for displaying image information, a projector 1 for projecting the image information onto the transparent projection screen 3, a light modulation element arranged between the projector 1 and the transparent projection screen 3 and a first polaroid 2 arranged at the other side of the transparent projection screen 3 for displaying the image information, the transmission axis of the first polarizer 2 has a first polarization direction, and the light has a second polarization direction after passing through the light modulation element, the included angle theta between the first polarization direction and the second polarization direction is freely adjusted within the range of more than or equal to 0 degrees and less than 90 degrees.
In the present application, as a preferred embodiment, the first polarizer 2 is fixed to the back surface of the transparent projection screen 3. As a further preferred embodiment, the first polarizer 2 may be fixed to the back surface of the transparent projection screen 3 by, but not limited to, a back adhesive or a sandwich adhesive. In a preferred embodiment, the light modulation element is a second polarizer 4, and the second polarizer 4 can rotate in the plane of the second polarizer. As a further preferred embodiment, the first polarizer 2 and the second polarizer 4 are linear polarizers, and the transmission axis directions of the first polarizer 2 and the second polarizer 4 are set at any angle other than perpendicular. As a further preferred embodiment, the first polarizer 2 and the second polarizer 4 are circular polarizers, and the first polarizer 2 and the second polarizer 4 are disposed at any angle that is not chirally opposite.
In this application, as a preferred embodiment, the second polarizer 4 is fixed in a snap-in type or a screw-in type, which facilitates adjustment of the angle of the second polarizer 4. As a further preferred embodiment, the fastening structure may be configured to include a fastening ring 11 disposed on the lens of the projector 1, and a fastening 12 matched with the fastening ring 11, and the second polarizer 4 is disposed inside the fastening 12. In a further preferred embodiment, the holding ring 11 is provided with a handle 13 for fixing the second polarizer 4.
In the present application, as a preferred embodiment, the light modulation element is a liquid crystal light valve, and the liquid crystal light valve is provided with an electrical connection port. In a preferred embodiment, the transparent projection screen is a rigid transparent projection screen or a flexible transparent projection screen. In a further preferred embodiment, the rigid transparent projection screen is a transparent projection screen formed by fixing the transparent projection screen with a glass-sandwiched adhesive or a fixing frame; as a further preferred embodiment, the flexible transparent projection screen is a holographic film or a transparent optical projection film.
In the present application, as a preferred embodiment, the projector is a DLP projector, and the light modulation element is fixed to a lens of the DLP projector; the projector is an LCD projector or an LCOS projector, and the light modulation element is fixed inside the LCD projector or the LCOS projector.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, it will be apparent to those skilled in the art that the present application may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form. In this regard, the illustrated example embodiments are provided for purposes of illustration only and are not intended to be limiting of the present application. Therefore, the scope of the present application is not limited to the particular embodiments described above, but is only limited by the scope of the appended claims.
Example 1
The transparent projection system comprises a projector 1, a first polaroid 2, a transparent projection screen 3 and a light modulation element, wherein the light modulation element is a second polaroid 4; wherein the angle between the first polarizer 2 and the second polarizer 4 can be adjusted at any time, and the included angle theta of the light transmission direction is more than or equal to 0 degree and less than 90 degrees. As can be seen from fig. 1, after the light beam exits from the projector 1, the light beam is converted into polarized light after encountering the second polarizer 4, the polarized light reaches the transparent projection screen 3, an included angle between the light beam direction exiting from the projector 1 and the transparent projection screen 3 is not necessarily vertical, and the projector 1 may be hung or placed on the ground to present a projection at a certain angle, or may be in a side projection manner. By means of the diffuse reflection or scattering effect of the transparent projection screen 3, the image presented on the projection screen 3 is clearly visible to the viewer on the side of the projector 1. Due to the transparency of the projection screen, a portion of the light will pass through the transparent projection screen 3 to reach the first polarizer 2.
According to the actual on-site light environment, by adjusting the included angle relationship between the transmission axes of the second polarizer 4 and the first polarizer 2, as shown in fig. 2, when the light intensity passing through the first polarizer 2 is lower than the ambient light intensity, we can see that the secondary imaging has no influence on human eyes. The technical effect of flexibly adjusting the transmission (the transmission axes of the second polarizer 4 and the first polarizer 2 are parallel, namely theta is equal to 0 degrees), the partial transmission (the included angle of the transmission axes of the second polarizer 4 and the first polarizer 2 is an acute angle, namely theta is less than 0 degrees and less than 90 degrees) or the basic shielding (the included angle of the transmission axes of the second polarizer 4 and the first polarizer 2 is nearly vertical, namely theta is nearly 90 degrees) of the image positioned behind the transparent projection screen is realized. Because some other films (including but not limited to transparent projection screen substrates, scratch-resistant films, protective films, etc.) are often added in the projection system, but the adopted films are not completely polarization-maintaining (that is, the polarization state of polarized light passing through the films is often changed to some extent), the polarization direction of linearly polarized light passing through the films which are not completely polarization-maintaining is changed due to the non-polarization-maintaining characteristics of the films, and for the case of θ being 90 °, complete shielding is often achieved theoretically, but in the actual case, complete shielding is often not achieved when θ being 90 °, the application can flexibly adjust the transmission axis included angle θ between the second polarizer 4 and the first polarizer 2, so as to achieve flexible adjustment of transmission, partial transmission, or substantially complete shielding of an image located behind the transparent projection screen in the actual case.
The first polarizer 2 and the second polarizer 4 may be linear polarizers or circular polarizers. If the polarizer is a circular polarizer, the positional relationship between the first polarizer 2 and the second polarizer 4 may be any angle except for the opposite chirality; in the case of a linear polarizer, the positional relationship between the first polarizer 2 and the second polarizer 4 may be any angle other than the orthogonal transmission axes.
Example 2
Taking the structure of the transparent projection system capable of reducing secondary imaging in embodiment 1 as a reference, the method for reducing secondary imaging is mainly implemented by adjusting the included angle relationship between the transmission axes of the two polarizers. In practical applications, the first polarizer 2 is often attached to or sandwiched between transparent projection screens, and no effective angular adjustment is possible, so the angular adjustment is usually achieved by the second polarizer 4. There are various angle adjustment methods for the second polarizer 4, and this embodiment provides a method for adjusting the angle of the polarizer. As can be seen from fig. 3, a small snap ring 11 is additionally installed in front of the projector lens 10, then the second polarizer 4 is placed inside the buckle 12, the second polarizer 4 is fixed on the buckle 12 matched with the snap ring 11, and after the angle of the second polarizer 4 is adjusted, the second polarizer 4 is fixed by using a small fixing handle 13 on the edge.
Example 3
In order to reduce secondary imaging of the transparent projection screen, on the basis of the transparent projection system described in embodiment 1, another embodiment of a transparent projection system capable of reducing secondary imaging is further provided, in which the light modulation element is a liquid crystal light valve, and the liquid crystal light valve includes a first substrate, a first transparent conductive layer, a liquid crystal layer, a second transparent conductive layer, and a second substrate that are sequentially disposed along a side away from the projector 1, in this embodiment, the second polarizer 4 is located between the projector 1 and the liquid crystal light valve, and the second polarizer 4 may be fixed, for example, outside a lens of the projector 1, or may be attached to an outside of the first substrate of the liquid crystal light valve. As shown in fig. 4, in this structure: the transmission axis of the first polarizer 2 has a first polarization direction, light emitted by the projector 1 passes through the second polarizer 4 and then becomes linearly polarized light, the linearly polarized light then enters the liquid crystal light valve, according to different voltages applied to the liquid crystal light valve, because the liquid crystal layer in the liquid crystal light valve has an optical rotation effect on the polarized light, the linearly polarized light rotates in the polarization direction in the liquid crystal light valve (the rotation angle and the voltage applied to the liquid crystal layer have a direct relation), the polarization angle of light emitted from the liquid crystal light valve can be adjusted by applying voltages on two sides of the liquid crystal layer in the liquid crystal light valve, the light has a second polarization direction after passing through the liquid crystal light valve, the included angle theta between the first polarization direction and the second polarization direction is freely adjusted within the range of theta being more than or equal to 0 degree and less than 90 degrees, and therefore, the transmission of images positioned behind the transparent screen, The flexible adjustment of partial transmission or basic shielding is realized by using the liquid crystal light valve to replace the second polaroid 4 without other complicated mechanical structures, the operation and control can be conveniently realized by applying different voltages to the liquid crystal light valve, the controllability is good, the operation and the control are more convenient and efficient, the unfavorable secondary imaging generated by the transparent projection system is reduced, and the light intensity of the back image of the transparent projection system can be adjusted according to the requirement
Example 4
Fig. 5 is a schematic structural diagram of another embodiment of a transparent projection system capable of reducing secondary imaging, as shown in fig. 5, the same parts as those in embodiment 3 are not repeated, but the difference is that in this embodiment, the light emitted by the projector 1 is linearly polarized light, and a second polarizer does not need to be disposed between the projector 1 and the liquid crystal light valve in this embodiment. In this embodiment, the linearly polarized light emitted by the projector 1 enters the liquid crystal light valve, and according to different voltages applied to the liquid crystal light valve, because the liquid crystal layer in the liquid crystal light valve has an optical rotation effect on the polarized light, the linearly polarized light rotates in the polarization direction inside the liquid crystal light valve (the rotation angle and the voltage applied to the liquid crystal layer have a direct relationship), so that the polarization angle of light emitted from the liquid crystal light valve can be adjusted by the voltages applied to both sides of the liquid crystal layer in the liquid crystal light valve, the light has a second polarization direction after passing through the liquid crystal light valve, the included angle θ between the first polarization direction and the second polarization direction can be freely adjusted within the range of 0 ° to θ to 90 °, thereby realizing flexible adjustment of transmission, partial transmission or substantially complete shielding of an image behind a transparent projection screen, in this embodiment, the polarization direction of the polarized light is adjusted by applying the liquid crystal light valve, the liquid crystal light valve can be operated and controlled conveniently and quickly by applying different voltages to the liquid crystal light valve without other complicated mechanical structures, has good controllability and higher convenience and efficiency, reduces the unfavorable secondary imaging generated by the transparent projection system, and can adjust the light intensity of the back image of the transparent projection system according to the requirement.
To sum up, this application is through providing a transparent projection system that can reduce secondary imaging, including being used for showing image information's transparent projection screen 3 and being used for projecting image information projector 1 on the transparent projection screen 3, still including locating projector 1 with light modulation element between the transparent projection screen 3 and locating transparent projection screen 3 shows the first polaroid 2 of image information opposite side, the transmission axis of first polaroid 2 has first polarization direction, and light passes through have the second polarization direction behind the light modulation element, first polarization direction with the contained angle theta of second polarization direction is at the within range free adjustment that theta is less than or equal to 0 < 90.
The projection system can realize the technical effect of flexibly adjusting the transmission, partial transmission or basic shielding of the image behind the transparent projection screen by adjusting the included angle between the light modulation element and the light transmission axis of the first polarizer 2 behind the transparent projection screen.
Although the description is given in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art will recognize that the embodiments described herein may be combined as a whole to form other embodiments as would be understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (15)
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| CN202011593038.6A CN112596334A (en) | 2020-12-29 | 2020-12-29 | Transparent projection system capable of reducing secondary imaging |
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| CN202011593038.6A CN112596334A (en) | 2020-12-29 | 2020-12-29 | Transparent projection system capable of reducing secondary imaging |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788756A (en) * | 2010-03-25 | 2010-07-28 | 河北工业大学 | Stereoprojection device of single projector with single liquid crystal light valve |
| CN204687853U (en) * | 2015-03-20 | 2015-10-07 | 京东方科技集团股份有限公司 | A kind of in-vehicle display system and automobile |
| CN111240134A (en) * | 2020-03-30 | 2020-06-05 | 深圳光子晶体科技有限公司 | Transparent projection display system with light cutting device |
| CN212009256U (en) * | 2020-03-30 | 2020-11-24 | 深圳光子晶体科技有限公司 | Transparent projection display system with light cutting device |
| CN213814278U (en) * | 2020-12-29 | 2021-07-27 | 江苏集萃智能液晶科技有限公司 | Transparent projection system capable of reducing secondary imaging |
-
2020
- 2020-12-29 CN CN202011593038.6A patent/CN112596334A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788756A (en) * | 2010-03-25 | 2010-07-28 | 河北工业大学 | Stereoprojection device of single projector with single liquid crystal light valve |
| CN204687853U (en) * | 2015-03-20 | 2015-10-07 | 京东方科技集团股份有限公司 | A kind of in-vehicle display system and automobile |
| CN111240134A (en) * | 2020-03-30 | 2020-06-05 | 深圳光子晶体科技有限公司 | Transparent projection display system with light cutting device |
| CN212009256U (en) * | 2020-03-30 | 2020-11-24 | 深圳光子晶体科技有限公司 | Transparent projection display system with light cutting device |
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