CN207937747U - Projection device - Google Patents

Abstract

A projection device, comprising: the device comprises an illumination system, a light splitting and combining element, at least two light valves and an imaging lens. The illumination system is used for providing an illumination light beam comprising a first color light and a second color light. The light splitting and combining element is configured on the transmission path of the illumination light beam and is used for allowing the first color light to penetrate through and reflecting the second color light. The at least two light valves are respectively arranged on the transmission paths of the first color light and the second color light from the light splitting and combining element and are used for respectively converting the first color light and the second color light into first color image light and second color image light. The imaging lens converts the received first color image light and the second color image light into a projection light beam, wherein the first color image light penetrates through the light splitting and combining element to the imaging lens, and the second color image light is reflected by the light splitting and combining element to the imaging lens.

Description

projection device

technical field

The utility model relates to a projection device, in particular to an illumination system and a projection device with a simple structure.

Background technique

The structure of a general projection device, such as a laser projector, often uses at least two dichroic mirrors with opposite coating conditions to arrange the light paths of different colors of light. However, these dichroic mirrors with opposite coating conditions will make the projection The energy consumption of the light beam of the device increases during the transmission process, and the volume of this structure has a limit on reduction, the manufacturing of the mechanical parts is complicated, and the required precision is also high. Therefore, how to improve the above problems is also one of the current research topics of the projection device. .

The paragraph "Background Technology" is only used to help understand the content of the present invention, so the content disclosed in the paragraph "Background Technology" may contain some known technologies that do not constitute the knowledge of those skilled in the art. The content disclosed in the "Background Technology" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present utility model have been known or recognized by those skilled in the art before the application of the utility model.

Utility model content

Embodiments of the present invention provide a projection device, which has the advantage of simple structure, can reduce the structure volume, reduce energy consumption of the projection device, and improve portability and optical efficiency of the projection device.

Other purposes and advantages of the utility model can be further understood from the technical characteristics disclosed in the utility model.

To achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention proposes a projection device, including: an illumination system, a light splitting and combining element, at least two light valves, and an imaging lens. The lighting system is used for providing lighting beams, and the lighting beams include a first color light and a second color light. The light splitting and combining element is arranged on the transmission path of the illuminating light beam to allow the first color light to pass through and reflect the second color light. At least two light valves are respectively arranged on the transmission paths of the first color light and the second color light from the splitting and combining elements, and are used to respectively convert the first color light and the second color light into the first color image light and the second color light respectively. Dichroic image light. The imaging lens is arranged on the transmission path of the first color image light and the second color image light from at least two light valves, and converts the first color image light and the second color image light into projection beams, wherein the first color image light The first color image light of the colored light passes through the light splitting element to the imaging lens, and the second color image light from the second light beam is reflected by the light splitting element to the imaging lens.

Based on the above, the projection device of the embodiment of the present invention has lower requirements for the number of splitting and combining light elements, and can achieve a structure using only a single piece of splitting and combining light elements. The volume of the projection device is miniaturized, and in addition, different coating films are not required, so the energy consumption of the projection device can be reduced, the portability and optical efficiency of the projection device can be improved, and the production cost can be reduced.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic perspective view of a projection device according to an embodiment of the present invention.

FIG. 2 is a schematic top view of the projection device according to the embodiment of FIG. 1 of the present invention.

FIG. 3 is a schematic side view of the projection device according to the embodiment of FIG. 1 of the present invention.

FIG. 4 is a schematic view of a projection device according to an embodiment of the present invention.

FIG. 5 is a schematic side view of a projection device according to an embodiment of the present invention.

FIG. 6 is a schematic side view of a projection device according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of the wavelength versus transmittance of a first color filter according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of the wavelength versus transmittance of a second color filter according to an embodiment of the present invention.

Detailed ways

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

Fig. 1 is a schematic diagram of a perspective of a projection device according to an embodiment of the present invention, Fig. 2 is a schematic bird's-eye view of the projection device according to the embodiment of Fig. A schematic side view of the projection device of the embodiment. 1 to 3, the projection device 100 includes an illumination system 110, a light splitting and combining element 120, at least two reflective elements, such as a reflective element M1 and a reflective element M2, and at least two light valves, such as a light valve 130 and a light valve 140, and an imaging lens 150.

The illumination system 110 is used for providing an illumination light beam IL, wherein the illumination light beam IL includes a first color light R and a second color light G. The splitting and combining light element 120 is arranged on the transmission path of the illumination light beam IL. The light path is separated, that is, the splitting and combining element 120 allows the first color light R to pass through and reflects the second color light G. In this embodiment, the illumination light beam IL can be a yellow light beam, and the first color light R can be a red light beam , the second color light G may be a green light beam, that is, a yellow light beam at least includes a red wave band and a green light beam, which is not limited by the present invention. The above-mentioned reflective element M1 and reflective element M2 are used to reflect the incident light beam, and are respectively arranged on the transmission path of the first color light R and the second color light G from the splitting and combining light element 120, so as to change the first color light R and the second color light G. The transmission direction of the colored light G.

The light valve 130 is arranged on the transmission path of the first color light R reflected by the reflective element M1 for converting the reflected first color light R into the first color image light IB1; the light valve 140 is arranged on the reflected The second color light G reflected by the element M2 is on the transmission path, and is used for converting the reflected second color light G into the second color image light IB2.

In addition, the projection device 100 in this embodiment also includes a first prism group 160 and a second prism group 170. The first prism group 160 and the second prism group 170 have one or more prisms for controlling the beam Pass the route or split the beam. The first prism group 160 is arranged on the transmission path of the first color light R between the reflective element M1 and the light valve 130 , and the second prism group 170 is arranged on the transmission path of the second color light G between the reflective element M2 and the light valve 140 on the path. The first color light R enters the first prism group 160 from the surface S1 (ie, the first surface) after being reflected by the reflective element M1, and leaves the first prism group 160 from the surface S2 (ie, the second surface) and passes to the light valve 130, Converted by the light valve 130 into the first color image light IB1, the first color image light IB1 enters the first prism group 160 from the surface S2, and leaves the first prism group 160 from the surface S3 (that is, the third surface) and passes to the branch Light-combining element 120 . After the second color light G is reflected by the reflective element M2, it enters the second prism group 170 from the surface S4 (ie, the fourth surface), and leaves the second prism group 170 from the surface S5 (ie, the fifth surface) and is transmitted to the light valve 140. The light valve 140 is converted into the second color image light IB2, and the second color image light IB2 enters the second prism group 170 from the surface S5, and leaves the second prism group 170 from the surface S6 (ie, the sixth surface) to pass to the split-combine Light element 120 .

The imaging lens 150 is disposed on the transmission path of the first color image light IB1 from the light valve 130 and the second color image light IB2 from the light valve 140 . The first color image light IB1 converted from the first color light R passes through the splitting and combining element 120 again and is delivered to the imaging lens 150 , and the second color image light IB2 converted by the second light beam G is again split and combined by the light combining element 120 Reflected and transmitted to the imaging lens 150, the imaging lens 150 converts the received first color image light IB1 and second color image light IB2 into projection beams PB to display projection images.

In this embodiment, the illumination system 110 and the imaging lens 150 are arranged on the same side of the splitting and combining element 120 , and the first color image light IB1 and the second color image light IB2 are between the splitting and combining element 120 and the imaging lens 150 The transmission direction of is parallel to and opposite to the transmission direction of the illumination light beam IL between the illumination system 110 and the light splitting element 120 .

In the following paragraphs, the above-mentioned elements and the arrangement relationship between the above-mentioned elements will be described in detail.

For example, the illumination system 110 may include a light emitting element for emitting light beams, a light diffusing element, or a wavelength conversion device, etc. The light-emitting element is, for example, a diode module including a light-emitting diode or a laser diode chip (Laser Diode, LD), or a matrix composed of multiple diode modules to provide a monochromatic light beam, such as blue Color laser, red laser, but not limited thereto. The green beam represents that its peak wavelength (Peak Wavelength) falls within the wavelength range from 500 nanometers (nanometer) to 565 nanometers. The red beam represents that its peak wavelength falls within the wavelength range of 625nm to 740nm. The blue beam represents that its peak wavelength falls within the wavelength range of 400 to 470 nanometers, and the peak wavelength is defined as the wavelength corresponding to the maximum light intensity.

The wavelength conversion device is an optical element for converting a short-wavelength beam into a long-wavelength converted beam relative to the short-wavelength beam. For example, the wavelength conversion device can be a phosphor wheel (Phosphor Wheel), on which a photoluminescent material (such as phosphor) is arranged, which can receive short-wavelength light beams and generate corresponding waves through photoluminescence. conversion beam, but not limited thereto. In one embodiment, when the photoluminescent material is a phosphor that can excite a yellow beam and the light-emitting element provides a blue beam with a shorter wavelength to irradiate the phosphor that can excite a yellow beam, the phosphor can be excited by the blue beam And converting at least part of the blue light beam into a yellow light beam, wherein the yellow light beam has a yellow light spectrum with a peak wavelength between 535 nm and 570 nm; when the photoluminescent material is a phosphor that can excite a green light beam , the converted beam corresponds to a green beam. And when the phosphor wheel has a slot (Slot), the blue light beam passes through the phosphor wheel. The light diffusion element is an optical element used to diffuse/scatter the light beam passing through the light diffusion element, such as a diffusion wheel (Diffusor Wheel), a vibrating diffuser, a diffusion plate (Diffusion Plate) or a diffuser of other moving parts. Utility models are not limited thereto.

The detailed steps and specific implementation methods of the lighting system 110 can be obtained from the above description and common knowledge in the technical field for sufficient teachings, suggestions and implementation instructions, and thus will not be repeated here.

The light splitting and combining element 120 is an optical element having light splitting and light combining functions. In this embodiment, the light splitting and combining element 120 is a dichroic mirror (Dichroic Mirror, DM), with a dichroic coating on the surface, which has wavelength selectivity, and is a color separation that uses wavelength (color) to separate or combine light. slices, but not limited thereto. In this embodiment, the splitting and combining element 120 is designed to allow the first color light R belonging to the red light beam to pass through, and reflect the second color light G belonging to the green light beam, and the first color light converted by the first color light R The image light IB1 (that is, the red image light) penetrates the splitting and combining light element 120 again, and the second color image light IB2 (that is, the green image light) converted by the second light beam G is reflected by the splitting and combining light element 120 again, thereby making the first The color image light IB1 and the second color image light IB2 are transmitted to the imaging lens 150 after being combined by the splitting and combining element 120 . However, in another embodiment, the light splitting and combining element 120 is designed to reflect the red light beam and pass the green light beam, which is not limited by the present invention.

The light valve 130 or the light valve 140 refers to a digital micro-mirror device (Digital Micro-mirror Device, DMD), a silicon-on-silicon panel (Liquid-crystal-on-silicon Panel, LCOS Panel) or a liquid crystal panel (Liquid Crystal Panel, LCD) For any one of the spatial light modulators, in this embodiment, the number of light valves is, for example, two (the light valve 130 and the light valve 140 ), and they are digital micromirror devices. In detail, the light valve 130 is used for receiving the first color light R and converting the first color light R into the first color image light IB1. The light valve 140 is used for receiving the second color light G and converting the second color light G into the second color image light IB2. In this embodiment, the method for converting the received monochromatic light beams into image light beams by the light valve 130 and the light valve 140, its detailed steps and implementation methods can obtain sufficient teachings, suggestions and implementation instructions from the common knowledge in the technical field. So no more details.

The imaging lens 150 includes, for example, a combination of one or more optical lenses with diopters, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In an embodiment, the imaging lens 150 may also include a plane optical lens. The present invention does not limit the type and type of the imaging lens 150 . The imaging lens 150 is disposed on the transmission path of the first color image light IB1 and the second color image light IB2. In this embodiment, the imaging lens 150 is used to convert the first color image light IB1 and the second color image light IB2 into projection beams PB, and project the projection beams PB onto a projection medium. The projection medium is, for example, a projection screen, a projection wall, or an electronic whiteboard, and the present invention is not limited thereto.

FIG. 4 is a schematic view of a projection device according to an embodiment of the present invention. Referring to FIG. 4 , the projection device 100' of this embodiment can be applied to the projection device 100 described above.

In this embodiment, the projection device 100' further includes a light integrating rod (Rod) 112 and a first optical lens group 114. The light integrating column 112 and the first optical lens group 114 are sequentially arranged on the transmission path of the illumination light beam IL. The light integrating cylinder 112 is used to homogenize the light so that the passing beam can be projected uniformly and accurately. The first optical lens group 114 has one or more optical lenses for collimating the beam. The illumination light beam IL passes through the light integrating rod 112 and the first optical lens group 114 to the splitting and combining optical element 120 .

Please refer to the projection device 100 as shown in FIG. 1 or the projection device 100' as shown in FIG. It is divided into upper and lower parts: the first region BR where the illumination light beam IL from the illumination system 110 will be incident, and the image light (including the first color image light IB1 and the second color image light IB2 ) from the light valve 130 and the light valve 140 will be The incident second region TR. That is, the light paths of the first color light R and the second color light G will be separated after the illumination light beam IL enters the first region BR of the splitting and combining element 120 , and the image light from the light valve 130 and the light valve 140 enters the splitting and combining element 120 After the second region TR of the first color image light IB1 and the second color image light IB2 are combined and transmitted to the imaging lens 150 .

In other words, although the image lights IB1 , IB2 and the illumination light beam IL pass through the same splitting and combining light element 120 , the illuminated areas will be staggered. The arrangement direction of the first region BR and the second region TR, such as the z direction shown in FIG. 1 or FIG. 4 , will be perpendicular to the transmission direction of the illumination light beam IL between the illumination system 110 and the splitting light element 120, as shown in FIG. 1 or the positive x direction shown in FIG. 4 is also perpendicular to the transmission direction of the first color image light IB1 and the second color image light IB2 between the light splitting element 120 and the imaging lens 150, as shown in FIG. 1 or FIG. Negative x-direction shown in 4. That is, the transmission direction (negative x direction) of the first color image light IB1 and the second color image light IB2 between the light splitting element 120 and the imaging lens 150 is parallel to and opposite to the illumination light beam IL when the illumination system 110 and the light splitting element The transfer direction between 120 (positive x direction).

Next, please refer to FIG. 4, in this embodiment, the reflective element M1 and the reflective element M2 respectively reflect the first color light R and the second color light G from the first region BR to pass through the first prism group 160 and the second prism group 160. The prism group 170 is transmitted to the light valve 130 and the light valve 140 . The first prism group 160 and the second prism group 170 take the prism group formed by three beam-splitting prisms as an example here, but the utility model is for the prism quantity, optical path and light splitting of the first prism group 160 and the second prism group 170 Design is not limited.

In this embodiment, the second optical lens group 162 is arranged on the beam transmission path between the reflective element M1 and the first prism group 160, and the optical lens group 162 is also arranged on the light beam transmission path between the reflective element M2 and the second prism group 170. The third optical lens group 172 is used to collimate the reflected first color light R and the second color light G respectively.

Same as the above-mentioned embodiment, the light valve 130 and the light valve 140 are arranged on one side of the first prism group 160 and the second prism group 170 respectively, and the first color light R enters the light incident surface of the first prism group 160 and the second prism group The light exit surface of the first prism group 160 for the one-color image light IB1 is not the same surface, similarly, the light-incident surface of the second color light G entering the second prism group 170 is the same as the second color image light IB2 leaving the second prism group 170 The light-emitting surface of each is also a different surface.

The first color image light IB1 and the second color image light IB2 respectively leave the first prism group 160 and the second prism group 170 to enter the second region TR of the splitting light element 120, and the first color image light IB1 will pass through the splitting light. The second region TR of the element 120 is transmitted to the imaging lens 150 , and the second color image light IB2 is reflected by the second region TR of the splitting light element 120 to the imaging lens 150 .

In this embodiment, the illumination light beam IL provided by the illumination system 110 of the projection device 100' includes not only the first color light R and the second color light G, but also the third color light B. Here, the blue light beam is taken as an example, and the The light combination element 120 allows the third color light B to pass through, so the transmission path of the third color light B from the light splitting element 120 will be the same as that of the first color light R, but the utility model is not limited thereto, in another In the embodiment, the light splitting and combining element 120 reflects the third color light B, so the transmission path of the third color light B from the splitting and combining light element 120 is the same as that of the second color light G. Wherein, one of the light valve 130 and the light valve 140 can convert the third color light B into the third color image light IB3, therefore, the third color image light IB3 can follow the first color image light IB1 and the second color image light The optical path of one of IB2 is transmitted to the imaging lens 150 .

The first color image light IB1, the second color image light IB2 and the third color image light IB3 form projection light beams PB through the first prism group 160, the second prism group 170 and the imaging lens 150, so as to form a projection image on the projection medium , its detailed steps and implementation methods can obtain sufficient teachings, suggestions and implementation instructions from the common knowledge in the technical field, so it is not repeated here.

FIG. 5 is a schematic side view of a projection device according to an embodiment of the present invention. Referring to FIG. 5 , the projection device 700 of this embodiment can be applied to the above-mentioned projection device 100 and projection device 100'.

The implementation of the projection device 700 and the configuration relationship between the components are similar to the projection device 100 and the projection device 100', the main difference is that the projection device 700 not only includes the light integrating rod 112, but also includes at least two filters, the filter 180 and filter 182. The optical filter 180 is arranged on the transmission path of the first color light R which passes through the splitting and combining element 120, and is located between the splitting and combining element 120 and the light valve 130, and the optical filter 182 is arranged on the splitting and combining element. The transmission path of the second color light G reflected by 120 is located between the light splitting element 120 and the light valve 140 .

FIG. 6 is a schematic side view of a projection device according to an embodiment of the present invention. Referring to FIG. 6 , the projection device 800 of this embodiment can be applied to the projection device 100 , the projection device 100 ′, or the projection device 700 described above. The embodiment of the projection device 800 and the configuration relationship between the components are similar to the projection device 700, the main difference is that, compared with the projection device 700, it also includes the filter 180 and the filter 182, but the projection device 800 does not use light integration Column 112 is replaced by lens array module 184 . The lens array module 184 is disposed on the transmission path of the illumination light beam IL, and the illumination light beam IL passes through the lens array module 184 and then is transmitted to the splitting and combining light element 120 . The lens array module 184 is, for example, composed of two groups of lens arrays facing away from each other and arranged in alignment, wherein the convex surface of the lens array is regarded as the front side, and the flat surface is regarded as the back side, and the alignment arrangement here means the lenses of the two groups of lens arrays. The positions of the cells are aligned with each other. The light beam passes through the lens array module 184 to make the light distribution uniform.

Fig. 7 is a schematic diagram of the wavelength-to-transmittance change of a first color filter according to an embodiment of the present invention, and Fig. 8 is a schematic diagram of a second color filter according to an embodiment of the present invention Schematic diagram of the wavelength versus transmittance of the sheet. Please refer to FIG. 7 and FIG. 8, the wavelength-to-transmittance change of the filter 180 of the projection device 700 and the projection device 800 can be shown as the transmittance 410 in FIG. 7, the first color light R is a red beam, and the first After the color light R passes through the filter 180, other color lights other than red light can be filtered to make red more pure. The third color light B is a blue light beam, and the third color light B can filter other color lights other than blue light after passing through the filter 180 , to make blue more pure, for example, the first color light filter 180 has 100% penetration for blue light beams (third color light B) with wavelengths less than 470 nm and red light beams (first color light G) with wavelengths greater than 620 nm Rate. The wavelength-to-transmittance change of the filter 182 can be as shown in the transmittance 510 in FIG. To make the green color more pure, for example, the second color filter 182 has a 100% transmittance for the green light beam with a wavelength ranging from 500 nm to 565 nm. It is particularly noted that the present invention does not limit the configuration positions of the optical filter 180 and the optical filter 182. The embodiments in FIGS. 5 and 6 are only used as an example. In other embodiments, the optical filters can be It is arranged at any position on the transmission path of the monochromatic light beam (the first color light R or the second color light G). The present invention does not limit the range of colored light bands that can be filtered out by the optical filter 180 and the optical filter 182 , which can allow narrower band colored light to pass through to make the colored light more pure.

The specific implementation manners of the projection device 700 and the projection device 800 can obtain sufficient teachings, suggestions and implementation descriptions from the description of the above-mentioned embodiments, and thus will not be repeated here.

To sum up, an exemplary embodiment of the present invention provides a projection device, including: an illumination system, a light splitting and combining element, at least two reflecting elements, at least two light valves, and an imaging lens. The lighting system is used for providing lighting beams. The splitting and combining element is arranged on the transmission path of the illuminating light beam, and is used for dividing the illuminating beam into the first color light and the second color light, allowing the first color light to pass through, and reflecting the second color light. At least two reflective elements respectively reflect the first color light and the second color light. At least two light valves are used to respectively convert the reflected first color light and second color light into first color image light and second color image light, and the first color image light and second color image light are transmitted to In the above light splitting and combining element, the image light of the first color passes through the splitting and combining element to the imaging lens, and the second color image light is reflected by the splitting and combining element to the imaging lens. The imaging lens converts the first color image light and the second color image light into projection light beams. In this way, the projection device of this embodiment has lower requirements on the number of light splitting and combining elements, and can achieve a structure using only a single piece of splitting and combining light elements, and does not require multiple coatings, thus improving optical efficiency. In addition, the lighting system and the imaging lens of the projection device in this embodiment can be located on the same side, which can reduce the volume of the projection device and improve the portability of the projection device.

The above is only a preferred embodiment of the utility model, and should not limit the scope of implementation of the utility model, that is, all simple equivalent changes and modifications made according to the claims of the utility model and the description are still the same. It belongs to the scope covered by the utility model patent. In addition, any embodiment or claim of the present utility model does not need to achieve all the purposes, advantages or features disclosed in the present utility model. In addition, the abstract part and the title of the invention are only used to assist the retrieval of patent documents, and are not used to limit the scope of rights of the utility model. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

reference sign

100, 100’, 700, 800: projection device

110: Lighting system

112: Light integrating column

114: The first optical lens group

162: The second optical lens group

172: The third optical lens group

120: Separation and synthesis of light components

M1, M2: reflective elements

130, 140: light valve

150: imaging lens

160: the first prism group

170: second prism group

180, 182: Optical filter

184: Lens array module

410, 510: penetration rate

IL: Lighting Beam

R: primary shade

G: second color light

B: third color light

IB1: First color image light

IB2: Second color image light

IB3: Tertiary image light

PB: projected beam

BR: First Region

TR: Second Region

S1～S6: surface

x, y, z: direction

Claims (14)

1. A projection device, characterized in that it comprises: an illumination system, a light splitting and combining element, at least two light valves and an imaging lens, wherein, The lighting system is used to provide lighting beams, and the lighting beams include a first color light and a second color light; The light splitting and combining elements are arranged on the transmission path of the illumination light beam to allow the first color light to pass through and reflect the second color light; The at least two light valves are respectively arranged on the transmission paths of the first color light and the second color light from the light splitting and combining elements, and are used to separate the first color light and the second color light the two-color light is respectively converted into a first-color image light and a second-color image light; and The imaging lens is arranged on the transmission path of the first color image light and the second color image light from the at least two light valves, and the first color image light and the second color image light converted into a projection beam, Wherein, the first color image light from the first color light passes through the splitting and combining element to the imaging lens, and the second color image light from the second color light is reflected by the splitting and combining element to the imaging lens. 2. The projection device according to claim 1, characterized in that, the projection device further comprises at least two reflective elements, which are respectively arranged on the first color light and the second color light from the light splitting and combining elements. The transmission path of the colored light is used to respectively reflect the first colored light and the second colored light to the at least two light valves. 3. The projection device according to claim 1, wherein the transmission direction of the first color image light and the second color image light between the splitting light element and the imaging lens is parallel And opposite to the transmission direction of the illumination light beam between the illumination system and the light splitting and combining elements. 4. The projection device according to claim 3, wherein the illumination system and the imaging lens are disposed on the same side of the light splitting and combining elements. 5. The projection device according to claim 1, wherein the light splitting and combining elements include adjacent first and second areas, and the illumination beam from the lighting system is incident on the splitting and combining elements. The first area of the light combining element, the first color image light and the second color image light from the at least two light valves are incident on the second area of the light splitting and combining element. 6. The projection device according to claim 5, wherein the arrangement direction of the first region and the second region is perpendicular to the illumination beam between the illumination system and the light splitting and combining elements The transmission direction between the first region and the second region is perpendicular to the first color image light and the second color image light between the splitting light element and the imaging lens transfer direction between. 7. The projection device according to claim 5, characterized in that, the projection device further comprises at least two reflective elements, which are respectively arranged on the first colored light and the second colored light from the light splitting and combining elements. On the transmission path of the colored light, the at least two reflective elements respectively reflect the first colored light and the second colored light from the first region to the two light valves. 8. The projection device according to claim 7, further comprising The first prism group is arranged on the transmission path of the first color light and has a first surface, a second surface and a third surface, Wherein, the first color light reflected by one of the two reflective elements enters the first prism group from the first surface, and passes to the two prism groups after leaving the second surface. One of the light valves, wherein the first color image light enters the first prism group from the second surface, and passes to all the splitting light components after leaving the third surface the second area; and The second prism group is arranged on the transmission path of the second color light and has a fourth surface, a fifth surface and a sixth surface, Wherein, the second color light reflected by the other of the at least two reflective elements enters the second prism group from the fourth surface, and passes to the two prism groups after leaving the fifth surface. The other one of the two light valves, wherein the second color image light enters the second prism group from the fifth surface, and passes to all the splitting and combining elements after leaving the sixth surface Describe the second area. 9. The projection device according to claim 1, wherein the illumination light beam further comprises a third color light. 10. The projection device according to claim 9, wherein the light splitting and combining element is used to allow the third color light to pass through, and the transmission path of the third color light from the light splitting and combining element Same as the first color light. 11. The projection device according to claim 9, wherein the light splitting and combining element is used to reflect the third color light, and the transmission path of the third color light from the light splitting and combining element is related to the The second shade is the same. 12. The projection device according to claim 1, wherein the lighting system comprises: The light integrating rod is arranged on the transmission path of the illuminating light beam, and the illuminating light beam passes through the light integrating rod and then is transmitted to the light splitting and combining element. 13. The projection device according to claim 1, further comprising: Two optical filters are respectively arranged on the transmission paths of the first color light and the second color light, and are respectively located between the light splitting element and the two light valves. 14. The projection device according to claim 1, wherein the lighting system comprises: The lens array module is arranged on the transmission path of the illumination light beam, and the illumination light beam passes through the lens array module and then is transmitted to the light splitting and combining elements.