CN115996283B

CN115996283B - Touch interaction projection optical machine without external laser and camera module

Info

Publication number: CN115996283B
Application number: CN202310288437.9A
Authority: CN
Inventors: 陈铁昊; 牛建帅; 冯翀; 郭嘉伟; 张梦遥
Original assignee: Beijing Shenguang Technology Co ltd
Current assignee: Beijing Shenguang Technology Co ltd
Priority date: 2023-03-23
Filing date: 2023-03-23
Publication date: 2023-06-13
Anticipated expiration: 2043-03-23
Also published as: CN115996283A

Abstract

The invention relates to the technical field of optical projection, and provides a touch interaction projection optical machine without an external laser and a camera module, which comprises an imaging illumination assembly, a polarizer set and a projection lens set which are sequentially arranged along an optical path, wherein an LCOS (liquid Crystal on silicon) modulation chip is arranged on the P polarized light or S polarized light emergent side of the polarizer set, and a CMOS (complementary metal oxide semiconductor) camera chip is arranged at the symmetrical position of the LCOS modulation chip relative to a film coating plane of the polarizer set; the plurality of dichroic mirrors in the imaging illumination assembly combine red, green, blue, and infrared light. When the finger of the user slides in the projection area, the finger can reflect infrared light spots, and the light spots return to the original path of the projection lens group and are received by the CMOS camera chip after being reflected by the polarizer group. The image information received by the CMOS camera chip is compared with the original image information received by the LCOS modulation chip, so that the sliding position of the finger in the projection area can be determined, and projection touch interactive operation can be realized without setting an independent infrared laser module and an infrared camera module.

Description

Touch interaction projection optical machine without external laser and camera module

Technical Field

The invention relates to the technical field of optical projection, in particular to a touch interaction projection optical machine without an external laser and a camera module.

Background

In living home and office conference systems, projection systems are increasingly used, and projection touch technologies are correspondingly developed. For example, touch control of a projection picture is realized through a Time of flight (TOF) technology or a laser technology, however, when the TOF depth camera collects depth information, a specific algorithm is needed to realize, and a system is complex and has high requirements on a hardware platform. In the related art, three modules of a projection optical machine module, an infrared laser module and an infrared camera module are generally required at least for laser touch control, the infrared camera module is arranged near a projection lens and shoots touch control reflected light in a projection area, and touch control can be realized through calibration of camera information and projection information. However, many components for laser touch control are separately opened near the projection lens, and the structure is complex.

Disclosure of Invention

The present invention is directed to solving at least one of the technical problems existing in the related art. Therefore, the invention provides a touch interaction projection optical machine without externally connecting a laser and a camera module, wherein an LCOS (liquid crystal on silicon) modulation chip is arranged on the P polarized light or S polarized light emergent side of a polarizer group, a CMOS (Complementary Metal Oxide Semiconductor ) camera chip is arranged at the symmetrical position of the LCOS modulation chip relative to a film coating plane of the polarizer group, the combined light emitted by an imaging illumination assembly comprises infrared light, an independent infrared laser module and an infrared camera module are not required to be arranged, touch interaction operation can be realized only by one set of projection optical machine, and the structure of the projection optical machine is more simplified.

The projection optical machine capable of touch interaction without externally connecting a laser and a camera module provided by the embodiment of the invention comprises:

the imaging illumination device comprises an imaging illumination assembly, a polarizer set and a projection lens set which are sequentially arranged along a light path, wherein a coating plane of the polarizer set is obliquely arranged relative to the light path, an LCOS modulation chip is arranged on a P polarized light or S polarized light emergent side of the polarizer set, and a CMOS camera chip is arranged at a symmetrical position of the LCOS modulation chip relative to the coating plane of the polarizer set;

the imaging illumination assembly comprises a red light source, a green light source, a blue light source, an infrared light source and a plurality of dichroic mirrors, wherein the dichroic mirrors are used for forming combined light irradiated to the polarizer group by the red light, the green light, the blue light and the infrared light.

According to one embodiment of the invention, the polarizer set comprises one of a PBS (polarization beam splitter, polarizing beamsplitter) prism or a metal wire grid polarizer.

According to one embodiment of the invention, the symmetrical position of the LCOS modulation chip relative to the film plating plane of the polarizer group is a mirror image position, and the CMOS camera chip has eccentricity and inclination relative to the mirror image position.

According to one embodiment of the invention, the red light source, the green light source and the blue light source form a main light path into which the infrared light source is laterally incorporated by the dichroic mirror;

alternatively, the infrared light source forms a main light path into which the red light source, the green light source, and the blue light source are laterally incorporated by the dichroic mirror.

According to one embodiment of the invention, the location of the LCOS modulation chip is interchanged with the CMOS camera chip.

According to one embodiment of the invention, an infrared filter is arranged between the polarizer set and the CMOS image pickup chip.

According to one embodiment of the invention, a quarter-phase retarder is disposed between the polarizer set and the LCOS modulation chip.

According to one embodiment of the invention, the LCOS modulation chip is positioned on the S polarized light outgoing side of the polarizer set, and a metal wire grid polarizer is arranged between the imaging illumination assembly and the polarizer set.

According to one embodiment of the invention, a fly eye lens is disposed between the imaging illumination assembly and the metal wire grid polarizer.

According to one embodiment of the invention, a polarized light conversion sheet is disposed between the fly eye lens and the metal wire grid polarizer.

According to one embodiment of the invention, an integrator lens is arranged between the polarization conversion plate and the metal wire grid polarizer.

According to one embodiment of the present invention, the light emitting sides of the red light source, the green light source, the blue light source and the infrared light source are all provided with a beam collimation module.

The above technical solutions in the present invention have at least one of the following technical effects:

the projection optical machine capable of realizing touch interaction without externally connecting a laser and a camera module comprises an imaging illumination assembly, a polarizer set and a projection lens set which are sequentially arranged along an optical path, wherein a film plating plane of the polarizer set is obliquely arranged relative to the optical path, an LCOS (liquid Crystal on silicon) modulation chip is arranged on a P polarized light or S polarized light emergent side of the polarizer set, and a CMOS (complementary metal oxide semiconductor) camera chip is arranged at a symmetrical position of the LCOS modulation chip relative to the film plating plane of the polarizer set; the imaging illumination assembly includes a red light source, a green light source, a blue light source, an infrared light source, and a plurality of dichroic mirrors for forming red, green, blue, and infrared light into combined light that is directed to the polarizer set. When the projection optical machine works, the imaging illumination assembly emits uniform combined light to the polarizer set, the combined light transmits P polarized light and reflects S polarized light at a film plating plane of the polarizer set, or transmits S polarized light and reflects P polarized light, the S polarized light reaches the LCOS modulation chip for modulating image information, and the modulated image information is projected to projection areas such as a wall body/curtain and the like along the projector set. The S-polarized light that impinges on the LCOS chip includes infrared light, which is also included in the beam projected onto the projection area. When the finger of the user slides in the projection area, the finger can reflect the highlight infrared light spots, the infrared light spots return to the original path through the projection lens group and are received by the CMOS camera chip after being reflected by the polarizer group, and the function of the camera can be realized. The image information received by the CMOS camera chip is compared with the original image information received by the LCOS modulation chip, the sliding position of the finger in the projection area can be determined, an independent infrared laser module and an infrared camera module are not required to be arranged, projection touch interactive operation can be realized only by one set of projection touch optical machine, and the structure is more simplified.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a projector with a touch interaction function without an external laser and a camera module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a projector with a touch interaction function without external laser and camera module according to the second embodiment of the present invention;

fig. 3 is a schematic block diagram of a PBS lens of a touch interaction projection optical engine without an external laser and a camera module according to an embodiment of the present invention.

Reference numerals:

110. an imaging illumination assembly; 111. a red light source; 112. a green light source; 113. a blue light source; 114. an infrared light source; 115. a dichroic mirror; 116. a beam collimation module; 1161. a first collimating lens; 1162. a second collimating lens;

120. a polarizer group; 121.LCOS modulation chip; 122. a CMOS image pickup chip; 123. an infrared filter; 124. a quarter-phase retarder; 125. a metal wire grid polarizer; 126. a fly-eye lens; 127. a polarized light conversion sheet; 128. an integrating lens;

130. a projection lens group;

200. and (5) projecting the area.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which would be apparent to one of ordinary skill in the art without making any inventive effort are intended to be within the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.

In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

In the related art, three modules of a projection optical machine module, an infrared laser module and an infrared camera module are generally required at least for laser touch control, the infrared camera module is arranged near a projection lens and shoots touch control reflected light in a projection area, and touch control can be realized through calibration of camera information and projection information. However, many components for laser touch control are separately opened near the projection lens, and the structure is complex.

Referring to fig. 1 to 3, the optical-mechanical projection device capable of touch interaction without external laser and camera module provided in the embodiment of the invention includes an imaging illumination assembly 110, a polarizer set 120 and a projector set 130 sequentially arranged along an optical path.

The imaging illumination assembly 110 is configured to emit uniform combined light to the polarizer set 120, wherein a film plating plane of the polarizer set 120 is inclined with respect to the optical path, and a film plating is disposed on the film plating plane of the polarizer set 120, so as to transmit P-polarized light or S-polarized light. After reaching the polarizer set 120, the combined light forms P-polarized light/S-polarized light transmitted through the polarizer set 120 and S-polarized light/P-polarized light reflected on the plating plane, and the LCOS modulation chip 121 is disposed on the P-polarized light or S-polarized light emitting side of the polarizer set 120. The working principle of the LCOS modulation chip 121 disposed on the P-polarized light or S-polarized light emitting side of the polarizer set 120 is the same, and in this embodiment, taking the case that the LCOS modulation chip 121 is disposed on the S-polarized light emitting side of the polarizer set 120, a CMOS image pickup chip 122 is disposed at a symmetrical position of the LCOS modulation chip 121 with respect to the film plating plane of the polarizer set 120.

According to the embodiment of the invention, the imaging illumination assembly 110 not only comprises the red light source 111, the green light source 112 and the blue light source 113, but also comprises the infrared light source 114 and a plurality of dichroic mirrors 115.

Referring to fig. 1 and 2, a red light source 111 emits red light, a green light source 112 emits green light, a blue light source 113 emits blue light, and a white light combination is formed by a plurality of dichroic mirrors 115. Meanwhile, the infrared light source 114 is incorporated into the optical path by the dichroic mirror 115, so that the combined light emitted from the imaging illumination assembly 110 includes infrared light.

When the projection optical machine works, the imaging illumination assembly 110 emits uniform combined light to the polarizer set 120, the P polarized light in the combined light is transmitted through the film plating plane of the polarizer set 120, the S polarized light in the combined light is reflected to the LCOS modulation chip 121 at the film plating plane, the LCOS modulation chip 121 is used for modulating image information, and the modulated image information is projected to the projection area 200 such as a wall body/curtain along the projector set 130. At the same time, the infrared light in the combined light synchronously reaches the projection area 200, and the infrared light covers the whole projection area 200 under the action of the projection lens group 130. When the finger of the user slides in the projection area 200, the finger reflects the highlight infrared light spot, and the infrared light spot returns to the original path through the projection lens set 130, is reflected by the polarizer set 120 and then is received by the CMOS camera chip 122, so that the function of the camera can be realized. Comparing the image information received by the CMOS image pickup chip 122 with the original image information received by the LCOS modulation chip 121, the position of the finger sliding in the projection area 200 can be determined. In the embodiment of the invention, compared with the traditional projection touch scheme, the projection touch interactive operation can be realized by only one set of projection optical machine without arranging an independent infrared laser module and an infrared camera module, and the structure of the projection optical machine is more simplified.

It should be noted that, when the infrared light passing through the projection lens set 130 irradiates the finger and is scattered, the reflected light includes P-polarized light and S-polarized light, and the reflected light passes through the polarizer set 120 again, the S-polarized light in the reflected light irradiates the CMOS image pickup chip 122, so that the CMOS image pickup chip 122 can obtain the infrared light spot on the finger.

In some embodiments, the polarizer set 120 includes one of a PBS prism or a metal wire grid polarizer.

Referring to fig. 1 and 2, the pbs prism can transmit P polarized light and reflect S polarized light, and the metal wire grid polarizer can transmit S polarized light and reflect P polarized light. The PBS prism and the metal wire grid polarizer can both increase the proportion of polarized light used by the LCOS modulation chip 121, thereby increasing the light efficiency and significantly increasing the contrast ratio.

According to the projection optical machine capable of touch interaction without external laser and camera module provided by the embodiment of the invention, the polarizer set 120 comprises one of a PBS prism or a metal wire grid polarizer, so as to improve the proportion of polarized light used by the LCOS modulation chip 121, further improve the light efficiency and remarkably improve the contrast ratio. In practical use, the positions of the LCOS modulation chip 121 and the CMOS image pickup chip 122 may be interchanged, and the LCOS modulation chip 121 may receive both P-polarized light and S-polarized light.

In some embodiments, the symmetrical position of the LCOS modulation chip 121 with respect to the coating plane of the polarizer set 120 is a mirror position, and the CMOS camera chip 122 has an eccentricity and tilt with respect to the mirror position.

It can be understood that when the CMOS image capturing chip 122 has decentration and inclination with respect to the mirror image position, binocular parallax exists between the image acquired by the CMOS image capturing chip 122 and the original image of the LCOS modulation chip 121, so that 3D depth information can be established, which is helpful for determining the position of the user during touch and identifying the touch action of the user.

When the CMOS image pickup chip 122 is tilted with respect to the mirror position, an angle is formed between the CMOS image pickup chip 122 and the mirror position, see fig. 2 and 3. When the CMOS image pickup chip 122 is eccentric with respect to the mirror position, the center of the CMOS image pickup chip 122 and the center of the mirror position are offset from each other, and there is binocular parallax between the image obtained by the CMOS image pickup chip 122 and the original image of the LCOS modulation chip 121.

According to the touch interaction projection optical machine without an external laser and a camera module provided by the embodiment of the invention, the infrared light source 114 is additionally arranged in the imaging illumination assembly 110, so that an external infrared laser module is omitted, and the structure of the touch interaction projection optical machine without the external laser and the camera module is simplified.

In some embodiments, red light source 111, green light source 112, and blue light source 113 form a main optical path into which infrared light source 114 is laterally incorporated by dichroic mirror 115.

Referring to fig. 1 to 2, a red light source 111, a green light source 112, and a blue light source 113 form a main light path by two dichroic mirrors 115, and an infrared light source 114 is laterally incorporated into the main light path by the dichroic mirrors 115. It should be noted that, the position of the infrared light source 114 in the lateral direction of the main light path may be adjusted, and the infrared light source may be disposed along the outer side of the main light path, and may be rotated by 90 °, 180 °, 270 °, etc., without affecting the functions thereof.

In other embodiments, infrared light source 114 forms a main optical path into which red light source 111, green light source 112, and blue light source 113 are laterally incorporated by dichroic mirror 115.

In some embodiments, an infrared filter 123 is disposed between the polarizer set 120 and the CMOS camera chip 122.

Referring to fig. 1 to 3, the light returning to the polarizer set 120 and the CMOS image pickup chip 122 along the projection lens set 130 includes not only infrared light but also a projected image on the projection area 200. An infrared filter 123 is arranged between the polarizer set 120 and the CMOS camera chip 122, and the infrared filter 123 only allows infrared light to reach the CMOS camera chip 122, so that interference of projection images is reduced, definition of infrared light spots acquired by the CMOS camera chip 122 is improved, and projection touch accuracy is improved.

In some embodiments, a zoom lens and/or an aberration correction lens are provided between the polarizer 120 and the CMOS camera chip 122.

The zoom lens group is used for adjusting the size of the image incident on the CMOS image pickup chip 122, which is beneficial for comparing the image obtained by the CMOS image pickup chip 122 with the original image received by the LCOS modulation chip 121. The aberration correction lens group is used for correcting the variegated phenomenon generated by the figure outline in the edge picture, and mainly comprises peripheral light quantity correction, distortion correction, chromatic aberration correction, diffraction correction and digital lens optimization, and the aberration correction lens group can reduce deviation from the ideal condition of Gaussian optics.

According to the touch interaction projection optical machine without external laser and camera module provided by the embodiment of the invention, the proportion of polarized light used by the LCOS modulation chip 121 is improved, the light efficiency can be improved, and the contrast of a projection image is remarkably improved, so that a plurality of different lens groups/lenses can be arranged to increase the proportion of polarized light incident to the LCOS modulation chip 121.

In some embodiments, a quarter-phase retarder 124 is disposed between the polarizer set 120 and the LCOS modulation chip 121.

Referring to fig. 1 to 3, the PBS prism is taken as an example of the polarizer set 120, the P polarized light in the combined light is transmitted through the PBS prism, and the S polarized light in the combined light is reflected when reaching the film plating plane of the PBS prism, so that the proportion of the S polarized light in the light beam incident on the LCOS modulation chip 121 is higher. However, in view of the light efficiency issues of the PBS prisms themselves, the reflected S-polarized light is not pure. A quarter-phase retarder 124 is disposed between the PBS prism and the LCOS modulation chip 121, and can convert the P-polarized light remaining in the light beam reflected by the PBS prism into S-polarized light, further increasing the proportion of the S-polarized light.

Meanwhile, the image modulated by the LCOS modulation chip 121 includes P-polarized light and a small portion of S-polarized light, and the quarter-phase retarder 124 may convert a small portion of the S-polarized light in the light beam modulated by the LCOS modulation chip 121 into P-polarized light, thereby increasing the contrast of the projected image.

In some embodiments, a metal wire grid polarizer 125 is disposed between the imaging illumination assembly 110 and the polarizer set 120.

Referring to fig. 1 to 3, the combined light from the imaging illumination assembly 110 includes P-polarized light and S-polarized light, and when the combined light passes through the metal wire grid polarizer 125, only S-polarized light is allowed to pass through, but P-polarized light is not allowed to pass through, so that the proportion of S-polarized light incident on the polarizer set 120 and the LCOS modulation chip 121 is increased, the light efficiency can be improved, and the contrast of the projected image can be significantly improved.

In some embodiments, a fly eye lens 126 is disposed between the imaging illumination assembly 110 and the metal wire grid polarizer 125.

Referring to fig. 1 to 2, the fly-eye lens 126 can shape and homogenize the combined light from the imaging illumination assembly 110, so that the S-polarized light incident on the LCOS modulation chip 121 is more uniform, and the projected image is clearer.

In some embodiments, a polarization conversion plate 127 is disposed between fly eye lens 126 and metal wire grid polarizer 125.

Referring to fig. 1 to 2, the polarization conversion plate 127 can convert P polarized light in the combined light into S polarized light, thereby improving optical efficiency.

In some embodiments, an integrator lens 128 is disposed between the polarization conversion plate 127 and the metal wire grid polarizer 125, and the integrator lens 128 is used to modulate light rays at different angles, so that the area of the light beam of the imaging illumination assembly 110 can be adjusted.

Referring to fig. 1 to 2, a dichroic mirror 115 is selected according to the arrangement positions of the red light source 111, the green light source 112 and the blue light source 113, so that the red light, the green light and the blue light form a combined light. The imaging effect of the projected image can be improved by adjusting the brightness and the mutual proportion of the red light, the green light and the blue light.

In some embodiments, the light emitting sides of the red light source 111, the green light source 112, the blue light source 113 and the infrared light source 114 are provided with a beam collimation module 116, and the beam collimation module 116 includes a first collimation lens 1161 and a second collimation lens 1162 sequentially arranged along the light emitting direction of the light sources.

Referring to fig. 1 to 2, the beam collimation module 116 includes a first collimation lens 1161 and a second collimation lens 1162, the first collimation lens 1161 is used for converging angles of light rays, and the second collimation lens 1162 is used for collimating the converged light rays. The light beams of the red light, the green light, the blue light and the infrared light passing through the light beam collimation module 116 are more uniform, which is helpful for improving the uniformity of the combined light and further improving the imaging effect.

According to the projection optical machine capable of touch interaction without external laser and camera module provided by the embodiment of the invention, the proportion of polarized light used by the LCOS modulation chip 121 is improved by adopting a mode that a plurality of lens groups are matched with each other so as to improve the light efficiency and remarkably improve the contrast ratio, and the polarization conversion principle in the optical path is described as follows:

the polarization conversion mainly includes four lens groups, which are a polarization conversion plate 127, a metal wire grid polarizer 125, a polarizer group 120, and a quarter-phase retarder 124, respectively.

1. The polarized light conversion sheet 127 converts the P polarized light in the combined light after the fly eye lens 126 shapes the uniform light into S polarized light, thereby improving the light efficiency;

2. the metal wire grid polarizer 125 is used for transmitting the S polarized light and reflecting the P polarized light, so that the proportion of the S polarized light to the total light energy is further increased;

3. the roles of the polarizer set 120 (PBS prism) include two points: the first characteristic is turning the optical path, adjusting the direction of the optical path, facilitating the arrangement of the LCOS modulation chip 121 and the CMOS camera chip 122; the second characteristic is that the light with P polarization is transmitted and the light with S polarization is reflected, so that the proportion of the light with S polarization to the total light energy is further increased;

4. the quarter-phase retarder 124 has a phase retardation function, and the P-polarized light and the S-polarized light have a phase difference of ± pi/2, and after passing through the quarter-phase retarder 124, the P-polarized light and the S-polarized light have a phase difference of ± pi/2, i.e. a phase difference of 0 or pi, so that the P-polarized light in the original optical path can be completely converted into the S-polarized light, thereby increasing the purity of the S-polarized light in the light incident on the LCOS modulation chip 121. The image signal modulated by the LCOS modulation chip 121 includes P polarized light and also includes a small amount of S polarized light, and after the small amount of S polarized light passes through the quarter-phase retarder 124 again, all the S polarized light is converted into P polarized light, which further increases the contrast of the projection image plane.

The light beam emitted by the imaging illumination assembly 110 undergoes the following several processes:

for the first time, the polarized light converting sheet 127 converts P polarized light into S polarized light, improving the purity of S polarized light;

the second time, the metal wire grid polarizer 125 transmits S polarized light and reflects P polarized light, further increasing the proportion of S polarized light to the total light energy;

thirdly, the PBS prism transmits P polarized light and reflects S polarized light, so that the proportion of the S polarized light to the total light energy is further increased;

fourth, the quarter-phase retarder 124 converts all of the P-polarized light in the original optical path into S-polarized light, thereby increasing the purity of the S-polarized light in the light incident on the LCOS modulation chip 121;

fifth time, after a small amount of S polarized light passes through the quarter-phase retarder 124 again, all the S polarized light is converted into P polarized light, so that the contrast of the projection image plane is further increased;

the sixth time, the PBS prism transmits P polarized light and reflects S polarized light, further increasing the proportion of P polarized light to the total light energy.

In summary, the projection optical machine capable of touch interaction without external connection of a laser and an image capturing module provided in the embodiment of the invention includes an imaging illumination assembly 110, a polarizer set 120 and a projection lens set 130 sequentially arranged along an optical path, wherein a film plating plane of the polarizer set 120 is obliquely arranged relative to the optical path, an LCOS modulation chip 121 is arranged on a P-polarized light or S-polarized light emitting side of the polarizer set 120, and a CMOS image capturing chip 122 is arranged at a symmetrical position of the LCOS modulation chip 121 relative to the film plating plane of the polarizer set 120; the imaging illumination assembly 110 includes a red light source 111, a green light source 112, a blue light source 113, an infrared light source 114, and a plurality of dichroic mirrors 115, the plurality of dichroic mirrors 115 being configured to form red, green, blue, and infrared light into a combined light that is directed to a polarizer set 120. When the touch interactive projection optical machine without the external laser and the camera module works, the imaging illumination assembly 110 emits uniform combined light to the polarizer set 120, the combined light transmits P polarized light and reflects S polarized light at the film plating plane of the polarizer set 120, or transmits S polarized light and reflects P polarized light, the S polarized light reaches the LCOS modulation chip 121 by taking the reflected S polarized light as an example, the LCOS modulation chip 121 is used for modulating image information, and the modulated image information is projected to the projection area 200 such as a wall body/curtain along the projector set 130. The S polarized light irradiated to the LCOS modulation chip 121 includes infrared light, when the finger of the user slides in the projection area 200, the finger reflects the highlighted infrared light spot, and the infrared light spot returns to the original path through the projection lens set 130, is reflected by the polarizer set 120 and is received by the CMOS camera chip 122, so that the function of the camera can be realized. The image information received by the CMOS camera chip 122 is compared with the original image information received by the LCOS modulation chip 121, so that the sliding position of the finger in the projection area 200 can be determined, an independent infrared laser module and an infrared camera module are not required to be arranged, the projection touch interaction operation can be realized only by a set of touch interaction projection optical machine without an external laser and a camera module, and the structure of the touch interaction projection optical machine without the external laser and the camera module is more simplified.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The utility model provides a but need not external laser instrument and interactive projection ray apparatus of touch-control of module of making a video recording, its characterized in that includes:

the imaging illumination device comprises an imaging illumination assembly, a polarizer set and a projection lens set which are sequentially arranged along a light path, wherein the polarizer set is a PBS prism, a coating plane of the polarizer set is obliquely arranged relative to the light path, an LCOS modulation chip is arranged on a P polarized light or S polarized light emergent side of the polarizer set, and a CMOS camera chip is arranged at a symmetrical position of the LCOS modulation chip relative to the coating plane of the polarizer set; the symmetrical position of the LCOS modulation chip relative to the film plating plane of the polarizer group is a mirror image position, and the CMOS camera chip is eccentric and inclined relative to the mirror image position; when the CMOS camera chip is inclined relative to the mirror image position, an included angle is formed between the CMOS camera chip and the mirror image position; when the CMOS camera chip is eccentric relative to the mirror image position, the center of the CMOS camera chip and the center of the mirror image position are staggered;

2. The touch interaction projector of claim 1, wherein the red light source, the green light source and the blue light source form a main light path, and the infrared light source is laterally incorporated into the main light path by the dichroic mirror;

3. The touch interaction projector of claim 1, wherein the LCOS modulation chip and the CMOS camera chip are interchangeable in position.

4. The touch interaction projector according to any one of claims 1 to 3, wherein an infrared filter is disposed between the polarizer set and the CMOS camera chip.

5. The touch interaction projector according to any one of claims 1 to 3, wherein a quarter-phase retarder is disposed between the polarizer set and the LCOS chip.

6. The touch interaction projector optical machine without external lasers and camera modules according to claim 5, wherein the LCOS modulation chip is located on the S polarized light outgoing side of the polarizer set, and a metal wire grid polarizer is disposed between the imaging illumination assembly and the polarizer set.

7. The touch interaction projector optical machine without external laser and camera module according to claim 6, wherein a fly eye lens is arranged between the imaging illumination assembly and the metal wire grid polarizer.

8. The touch interaction projector optical machine without external laser and camera module according to claim 7, wherein a polarized light conversion sheet is arranged between the fly eye lens and the metal wire grid polarizer.

9. The touch interaction projector optical machine without external laser and camera module according to claim 8, wherein an integrating lens is arranged between the polarized light conversion sheet and the metal wire grid polarizer.

10. The interactive projector according to any one of claims 1 to 3, wherein the light emitting sides of the red light source, the green light source, the blue light source and the infrared light source are provided with a beam collimation module.