CN114690524A

CN114690524A - Optical illumination system and laser projection equipment

Info

Publication number: CN114690524A
Application number: CN202210334484.8A
Authority: CN
Inventors: 李晓平
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-01

Abstract

The application discloses optical lighting system and laser projection equipment belongs to the projection display field. The optical illumination system includes: because the optical illumination system only adopts a single LCOS to modulate the laser beam, the number of other optical devices matched with the optical illumination system is small. Therefore, the optical illumination system is made to include a smaller number of optical devices, and the volume of the entire optical illumination system is made smaller. Thus, the overall volume of the laser projection device integrated with the optical illumination system is small. In addition, because the compensation plate is arranged between the light splitting assembly and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, namely can compensate the pretilt angle, so that the purity of the S polarized light passing through the compensation plate is higher, and the contrast of the optical illumination system is further improved.

Description

Optical illumination system and laser projection equipment

Technical Field

The present disclosure relates to projection display, and more particularly to an optical illumination system and a laser projection apparatus.

Background

With the development of the photoelectric technology, the requirements for the projection picture of the laser projection device are higher and higher. At present, in order to ensure the display brightness of a projection picture, a laser is generally adopted to provide illumination for a laser projection device, and a laser beam emitted by the laser has the advantages of good monochromaticity and high brightness, and is an ideal light source.

Currently, laser projection devices typically include: laser light source, lighting system and projection lens. The lighting system generally comprises: the light-homogenizing component, the relay lens group, the color separation lens group, the reflector group, three Liquid Crystal on Silicon (LCOS for short), a polarization beam splitter (PBS for short) group (comprising three PBSs which respectively correspond to the three LCOS in a one-to-one manner) and an X-type color combining prism. The light beam emitted by the laser source is homogenized by the light homogenizing component, and then passes through the relay lens group, the color separation lens group and the reflector lens group to form red, green and blue three-color laser. The three LCOSs respectively modulate the lasers with different colors and then guide the lasers to the X-shaped color combination prism, and the X-shaped color combination prism combines the red, green and blue lights into white light and then projects the image onto a screen through a projection lens to realize the color display of the image.

However, the current illumination systems include more optical devices, which results in a larger volume of the entire illumination system, and thus the entire laser projection apparatus.

Disclosure of Invention

The embodiment of the application provides an optical lighting system and laser projection equipment. The problem that the size of laser projection equipment in the prior art is large can be solved, the technical scheme is as follows:

in one aspect, there is provided an optical illumination system comprising:

the liquid crystal display comprises a light homogenizing assembly, a light splitting assembly, a liquid crystal silicon-attached LCOS and a compensating plate, wherein the compensating plate is positioned between the light splitting assembly and the LCOS;

the even light subassembly is used for carrying out even light with the laser beam that light source system sent to with the laser beam direction behind the even light the beam split subassembly, the beam split subassembly be used for with the laser beam direction behind the even light LCOS, LCOS is used for with the laser beam behind the even light modulates, the compensator is used for adjusting the process the polarization state of the laser beam after the LCOS modulates, the beam split subassembly still is used for the laser beam direction projection lens after the polarization state adjustment.

In another aspect, there is provided a laser projection apparatus including:

the projection system comprises a light source system, an optical illumination system and a projection lens, wherein the optical illumination system is any one of the optical illumination systems.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a laser projection device, comprising: because the optical illumination system only adopts a single LCOS to realize the modulation of the laser beam, the number of other optical devices used in cooperation with the optical illumination system is small (for example, only one polarization splitting prism is needed). Therefore, the optical illumination system is made to include a smaller number of optical devices, and the volume of the entire optical illumination system is made smaller. Thus, the overall volume of the laser projection device integrated with the optical illumination system is small. In addition, because the compensation plate is arranged between the light splitting assembly and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, namely can compensate the pretilt angle, so that the purity of the S polarized light passing through the compensation plate is higher, and the contrast of the optical illumination system is further improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical illumination system provided in an embodiment of the present application;

FIG. 2 is an isometric view of the optical illumination system shown in FIG. 1;

FIG. 3 is an isometric view of another optical illumination system provided by an embodiment of the present application;

FIG. 4 is a front view of a compensator provided by embodiments of the present application;

FIG. 5 is a top view of the optical illumination system shown in FIG. 3;

FIG. 6 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present application;

FIG. 7 is an isometric view of an arrangement of an optical illumination system and a projection lens provided by an embodiment of the present application;

fig. 8 is a schematic structural diagram of a light source system according to an embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an optical illumination system according to an embodiment of the present disclosure, and fig. 2 is an axial view of the optical illumination system shown in fig. 1. The optical illumination system may include: the light-homogenizing component 100, the light-splitting component 200, the Liquid Crystal on Silicon (LCOS for short) 300 and the compensating plate 400.

The compensation plate 400 in the optical illumination system may be located between the light splitting assembly 200 and the LCOS 300.

The dodging assembly 100 in the optical illumination system may be configured to dodge a laser beam emitted by a light source system in the laser projection apparatus, and guide the dodged laser beam to the light splitting assembly 200. The light splitting assembly 200 can be used to direct the homogenized laser beam to the LCOS300, and the LCOS300 can be used to modulate the homogenized laser beam of the light homogenizing assembly 100. The compensation plate 400 in the optical illumination system can be used to adjust the polarization state of the laser beam modulated by the LCOS 300. The light splitting assembly 200 may also be used to guide the laser beam adjusted by the compensation plate 400 to a projection lens in the laser projection apparatus, and the projection lens may be used to project and image the laser beam modulated by the LCOS 300. Thus, when P-polarized light in the laser beam is incident on the LCOS300, S-polarized light is reflected after being modulated by the LCOS 300. However, the LCOS300 has a certain pretilt angle, which causes the modulated LCOS300 to reflect light with a polarization that is not pure S-polarization. The compensation plate 400 can adjust the polarization state of the laser beam modulated by the LCOS300, that is, can compensate the pretilt angle, so that the purity of the S-polarized light passing through the compensation plate 400 is high, and the contrast of the optical illumination system is further improved.

In the application, the LCOS300 used in the optical illumination system is monolithic. The display principle of LCOS is: the incident P polarized light irradiates on the LCOS chip, the LCOS chip does not deflect when the external voltage on two sides of a liquid crystal layer in the LCOS chip is 0 under the control of a driving circuit, the input P polarized light reaches the bottom of the LCOS chip and is reflected back to output the P polarized light, and the P polarized light returns along an original lighting light path. When external voltage exists on two sides of a liquid crystal layer in the LCOS chip, input P polarized light is deflected through the polarization direction of the liquid crystal layer, reaches the bottom of the LCOS chip and is reflected back to output S polarized light, and laser beams modulated by the LCOS chip are imaged through the projection lens.

For example, the light source system may emit a laser beam, which is transmitted in the light source system and is incident into the optical illumination system; then, the light source sequentially passes through the light homogenizing assembly 100, the light splitting assembly 200, the compensating plate 400 and the single LCOS300 in the optical lighting system; finally, the modulated single LCOS300 passes through the compensation plate 400, and then enters the projection lens through the light splitting assembly 200 to project an image. In this case, since the optical illumination system only uses the single LCOS to realize the modulation of the laser beam, the number of other optical devices used in cooperation therewith is also small (for example, only one polarization splitting prism is needed). Therefore, the optical illumination system is made to include a smaller number of optical devices, and the volume of the entire optical illumination system is made smaller. Thus, the overall volume of the laser projection device integrated with the optical illumination system is small. In addition, because the compensation plate 400 is disposed between the light splitting assembly 200 and the LCOS300, the compensation plate 400 can adjust the polarization state of the laser beam modulated by the LCOS300, that is, can compensate the pretilt angle existing in the LCOS300, so that the purity of the S-polarized light passing through the compensation plate 400 is high, and the contrast of the optical illumination system is further improved.

In summary, the present application provides an optical illumination system, which may include: because the optical illumination system only adopts a single LCOS to realize the modulation of the laser beam, the number of other optical devices used in cooperation with the optical illumination system is small (for example, only one polarization splitting prism is needed). Therefore, the optical illumination system is made to include a smaller number of optical devices, and the volume of the entire optical illumination system is made smaller. Thus, the overall volume of the laser projection device integrated with the optical illumination system is small. In addition, because the compensation plate is arranged between the light splitting assembly and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, namely can compensate the pretilt angle, so that the purity of the S polarized light passing through the compensation plate is higher, and the contrast of the optical illumination system is further improved.

Alternatively, please refer to fig. 3 and fig. 4, in which fig. 3 is an axial view of another optical illumination system provided in the embodiment of the present application, and fig. 4 is a front view of a compensator provided in the embodiment of the present application. The compensator 400 in the optical illumination system may be parallel to the light emitting surface a1 of the LCOS300, and the compensator 400 can rotate around the central axis L perpendicular to the light emitting surface a1 of the LCOS 300. In this case, when the LCOS300 has different pretilt angles, the compensation can be performed on the LCOS300 by rotating the compensation sheet 400, so as to further effectively improve the contrast of the optical illumination system.

In the embodiment of the present application, the angle range of the rotation of the compensation plate 400 around the central axis L perpendicular to the light emitting surface a1 of the LCOS300 may be negative 10 degrees to positive 10 degrees. For example, the angle of the compensation plate 400 rotating clockwise around the central axis L perpendicular to the light emitting surface a1 of the LCOS300 is positive, and the angle of the compensation plate 400 rotating counterclockwise around the central axis L perpendicular to the light emitting surface a1 of the LCOS300 is negative.

Optionally, as shown in fig. 3, the optical illumination system may further include: the first reflecting mirror 500 is located between the light homogenizing assembly 100 and the light splitting assembly 200, and the arrangement direction of the first reflecting mirror 500, the light splitting assembly 200 and the LCOS300 may be perpendicular to the arrangement direction of the plurality of optical lenses in the projection lens. The arrangement direction of the first reflecting mirror 500, the light splitting assembly 200 and the LCOS300 may be a Z-axis direction in the figure. It should be noted that, for the arrangement direction of the plurality of optical lenses in the projection lens, reference may be made to the description of the lens described later. The first reflecting mirror 500 may be configured to guide the laser beam homogenized by the light homogenizing assembly 100 to the light splitting assembly 200, and the light splitting assembly 200 may be configured to transmit the laser beam homogenized by the light homogenizing assembly and reflect the laser beam modulated by the LCOS300 to the projection lens. In this case, the first reflecting mirror 500 is disposed between the light homogenizing assembly 100 and the light splitting assembly 200, and the arrangement direction of the first reflecting mirror 500, the light splitting assembly 200, and the LCOS300 is perpendicular to the arrangement direction of the plurality of optical lenses. Therefore, the first reflecting mirror 500 can reflect the laser beam after the light uniformization of the light uniformizing assembly 100 to the light splitting assembly 200, i.e., the light path can be turned, the laser beam is transmitted to the LCOS300 through the light splitting assembly 200, and then the laser beam is modulated by the LCOS300 and then is reflected to the projection lens through the light splitting assembly 200. Therefore, the width of the optical illumination system in the arrangement direction of the dodging component 100 and the first reflecting mirror 500 can be smaller, and the laser projection equipment can normally project image pictures under the condition that the overall size of the laser projection equipment is smaller.

In the embodiment of the present application, as shown in fig. 3, the light splitting assembly 200 in the optical illumination system may include: the polarization splitting film on the sheet-shaped light splitting lens can face the light emitting surface a1 of the LCOS300 and face the optical lenses in the projection lens. For example, the sheet-shaped Beam splitter may be a Wire-grid Polarization Beam splitter (Wire-grid PBS), and the angle between the Wire-grid PBS and the light emitting surface a1 of the LCOS300 may be 45 degrees. The wire grid PBS may allow the incident P-polarized light to pass completely, while reflecting the incident S-polarized light at an exit angle of 45 degrees, the polarization direction of the S-polarized light being perpendicular to the polarization direction of the P-polarized light. For example, the P-polarized light in the laser beam after being homogenized by the light homogenizing assembly 100 is reflected by the first reflecting mirror 500 and then transmitted to the LCOS300 through the wire grid PBS, the LCOS300 modulates the P-polarized light to form S-polarized light and then reflects the S-polarized light, and the S-polarized light reflected from the LCOS300 is reflected to the projection lens through the reflecting surface of the wire grid PBS. It should be noted that the wire grid PBS may also transmit S-polarized light and reflect P-polarized light, which is not specifically limited in the embodiments of the present application.

Alternatively, as shown in fig. 3, the long side B1 of the LCOS300 in the optical illumination system may be in a direction perpendicular to the arrangement direction of the plurality of optical lenses in the projection lens. In this case, the long side B1 of the LCOS300 is perpendicular to the arrangement direction of the plurality of optical lenses in the projection lens. Therefore, the space occupied by the LCOS300 and the plurality of optical lenses in the arrangement direction of the plurality of optical lenses can be compressed, so that the overall volume of the laser projection apparatus integrated with the optical illumination system is further reduced.

In the embodiment of the present application, as shown in fig. 3 and fig. 5, fig. 5 is a top view of the optical illumination system shown in fig. 3. The optical illumination system in the laser projection apparatus may further include: the first spherical lens 600, the second spherical lens 700 and the third spherical lens 800 are arranged between the light homogenizing assembly 100 and the light splitting assembly 200 in sequence. In the present application, the first spherical lens 600 may have a light incident surface S1 and a light emitting surface S2, the light incident surface S1 of the first spherical lens 600 may be a plane, and the light emitting surface S2 of the first spherical lens 600 may be a convex surface; the second spherical lens 700 may have an incident surface S3 and an emergent surface S4, the incident surface S3 of the second spherical lens 700 may be a plane, and the emergent surface S4 of the second spherical lens 700 may be a convex surface; the third spherical lens 800 may have an incident surface S5 and an exit surface S6, the incident surface S5 of the third spherical lens 800 may be a convex surface, and the exit surface S6 of the third spherical lens 800 may be a plane surface. In this way, the laser beam can be adjusted into a parallel beam by the first spherical lens 600 and the second spherical lens 700, and then the beam is converged by the third spherical lens 800.

Alternatively, as shown in fig. 3, the first reflector 500 in the optical illumination system may be located between the second spherical lens 700 and the third spherical lens 800, and the arrangement direction of the second spherical lens 700 and the first reflector 500 is perpendicular to the arrangement direction of the third spherical lens 800 and the first reflector 500. The arrangement direction of the second spherical lens 700 and the first reflecting mirror 500 may be an X-axis direction in the figure, and the arrangement direction of the third spherical lens 800 and the first reflecting mirror 500 may be a Z-axis direction in the figure. For example, the laser beam after being homogenized by the light homogenizing assembly 100 sequentially passes through the first spherical lens 600 and the second spherical lens 700 to enter the first reflecting mirror 500, and then passes through the first reflecting mirror 500 to be reflected to the third spherical lens 800.

Optionally, in this embodiment, as shown in fig. 3, the optical illumination system may further include: the first polarizer 900 is located between the light splitting assembly 200 and the projection lens, and the first polarizer 900 can filter out part of polarized light in the laser beam, so that the contrast of the optical illumination system is improved. In addition, the first polarizer 900 can be matched with a projection screen at the rear end of the projection lens, so that higher projection efficiency is realized. In the present application, the optical illumination system may further include: and a second polarizer 1000 between the third spherical lens 800 and the light splitting assembly 200. In this case, the polarization state of the laser beam may be changed to some extent during the transmission of the laser beam in the optical system. Therefore, when the laser beam passes through the second polarizer 1000, the second polarizer 1000 can filter out a part of polarized light in the laser beam, thereby improving the contrast of the optical illumination system. Illustratively, when the light source system emits P-polarized light, the P-polarized light is transmitted in the light source system and directed into the optical illumination system. In the transmission process of the optical illumination system, the polarization state of part of laser beams in the P polarized light can be changed, and the second polarizer can filter the laser beams with the changed polarization state, so that the purity of the P polarized light is improved.

Optionally, as shown in fig. 3, the optical illumination system may further include: and a polarizer 1100 between the first polarizer 900 and the projection lens. The galvanometer 1100 can cause information carried on a laser beam emitted by the LCOS300 to generate pixel shift at the galvanometer 1100 and to be superimposed in the projection lens, so as to achieve higher resolution.

In the embodiment of the present application, as shown in fig. 3, the optical illumination system may further include: the flat glass 1200 located between the first polarizer 900 and the polarizer 1100 can be adapted to the back focus of the projection lens through the flat glass 1200, so that the display effect of the image picture projected by the projection lens is better. The plate glass 1200 may be provided or not, and this is not particularly limited in the embodiments of the present application.

In the embodiment of the present application, the dodging assembly 100 in the optical illumination system may include: a light pipe 100a and a fly-eye lens (not shown), both of which can homogenize the laser beam. For example, when the dodging assembly is a fly-eye lens, the fly-eye lens may include: the glass substrate, a plurality of microlenses arranged in an array on the light incident surface of the glass substrate, and a plurality of microlenses arranged in an array on the light emergent surface of the glass substrate. The micro lenses on the light incident surface correspond to the micro lenses on the light emergent surface one by one, and the shape and the size of each micro lens are the same as those of the corresponding micro lens. For example, the microlenses on the light incident surface and the microlenses on the light emitting surface may be spherical convex lenses or aspherical convex lenses. Thus, the plurality of microlenses on the light incident surface can divide the spots of the laser light emitted from the respective laser units. The divided light spots are accumulated through the micro lenses on the light emitting surface, so that laser beams emitted by the laser units can be homogenized, and the laser beams emitted by the first laser and the second laser are homogenized.

When the light uniformizing assembly 100 is a light guide 100a, the light guide 100a may be a tubular device formed by splicing four planar reflective sheets, i.e. a hollow light guide, light is reflected multiple times inside the light guide to achieve the light uniformizing effect, and the light guide may also be a solid light guide. The laser beam enters from the light inlet surface of the light guide pipe and then is emitted from the light outlet surface of the light guide pipe, and beam homogenization and light spot optimization are completed in the process of passing through the light guide pipe.

It should be noted that, in the embodiments of the present application, the light uniformizing assembly 100 is schematically illustrated as the light guide 100 a. In order to improve the efficiency of the LCOS300 modulating the laser beam, it is generally necessary to ensure that the long side of the light spot of the laser beam incident on the LCOS300 corresponds to the long side of the LCOS300, and the short side of the light spot of the laser beam corresponds to the short side of the LCOS 300.

Table 1 shows the radius of curvature R and the thickness T of the first spherical lens, the second spherical lens, and the third spherical lens in the embodiment of the present application. Wherein the radius of curvature R and the thickness T are both in millimeters (mm).

TABLE 1

Flour mark	Radius of curvature R	Thickness T
			First spherical lens	Infinity(s)	7.3
	-12.1
			Second spherical lens	Infinity(s)	7.28
	-22.3
			Third spherical lens	-32.07	5
	Infinity(s)

As shown in table 1, the value of the curvature radius of the light incident surface S1 of the first spherical lens 600 is infinity, the value of the curvature radius of the light emitting surface S2 of the first spherical lens 600 is-12.1 mm, and the value of the center thickness of the first spherical lens 600 is 7.3 mm; the value of the curvature radius of the light incident surface S3 of the second spherical lens 700 is infinity, the value of the curvature radius of the light emitting surface S4 of the second spherical lens 700 is-22.3 mm, and the value of the center thickness of the second spherical lens 700 is 7.28 mm; the value of the radius of curvature of the light incident surface S5 of the third spherical lens 800 is-32.07, the value of the radius of curvature of the light emitting surface S6 of the third spherical lens 800 is infinity, and the value of the center thickness of the third spherical lens 800 is 5 mm.

In the present application, the value of F # of the optical illumination system may be less than 2.3. Since the square of the value of F # of the optical illumination system is inversely proportional to the value of the etendue of the optical illumination system. In this manner, by reducing the value of F #, the value of the etendue of the optical illumination system can be increased, thereby making the efficiency of projection of the laser projection apparatus high.

In summary, the present application provides an optical illumination system, which may include: because the optical illumination system only adopts a single LCOS to realize the modulation of the laser beam, the number of other optical devices used in cooperation with the optical illumination system is small (for example, only one polarization splitting prism is needed). Therefore, the optical illumination system is made to include a smaller number of optical devices, and the volume of the entire optical illumination system is made smaller. In this way, the overall volume of the laser projection device integrated with the optical illumination system is small. In addition, because the compensation plate is arranged between the light splitting assembly and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, namely can compensate the pretilt angle, so that the purity of the S polarized light passing through the compensation plate is higher, and the contrast of the optical illumination system is further improved.

An embodiment of the present application further provides a laser projection apparatus, please refer to fig. 6, and fig. 6 is a schematic structural diagram of the laser projection apparatus provided in the embodiment of the present application. The laser projection apparatus may include: a light source system 01, an optical illumination system, and a projection lens 02. The optical illumination system may be any of the optical illumination systems mentioned above.

In the embodiment of the present application, the light source system 01 may include: a laser 011, a light combining group 012 and a second reflecting mirror 013. The light combining lens assembly 012 can be located at the light emitting side of the laser 011, and the light combining lens assembly 012 and the arrangement direction of the laser 011 can be perpendicular to the arrangement direction of the light combining lens assembly 012 and the second reflecting mirror 013. The laser 011 can be configured to emit laser beams of three colors to the light combining lens assembly 012, and the light combining lens assembly 012 can be configured to combine the laser beams of three colors and guide the combined laser beams to the second reflecting mirror 013. For example, the three colors of laser light may include: blue laser, green laser, and red laser. In the embodiments of the present application, the laser 011 emits laser light of three colors, i.e., blue laser light, green laser light, and red laser light, at the same time.

Optionally, the projection lens 02 in the laser projection apparatus may have a plurality of optical lenses 021, and the projection lens 02 may be configured to project and image the laser beam modulated by the LCOS 300.

In the present application, as shown in fig. 6 and 7, fig. 7 is an isometric view of an arrangement of an optical illumination system and a projection lens provided in an embodiment of the present application. The arrangement direction of the light combining mirror group 012 and the second reflecting mirror 013 in the light source system 01 may be parallel to the arrangement direction of the optical lenses 021 in the projection lens 02, and the arrangement direction of the light uniformizing assembly 100 and the light splitting assembly 200 in the optical illumination system may be perpendicular to the arrangement direction of the optical lenses 021. For example, the arrangement direction of the light combining unit 012 and the second reflecting mirror 013 can be a first direction, the arrangement direction of the optical lenses 021 can also be a first direction, the arrangement direction of the light homogenizing assembly 100 and the light splitting assembly 200 can be a second direction, and the first direction is perpendicular to the second direction. The first direction may be a Y-axis direction in the drawing, and the second direction may be an X-axis direction in the drawing. It should be noted that the laser 011 and the light combining mirror 012 in the light source system 01 are all located on the same side of the optical illumination system as the optical lenses 021 in the projection lens 02.

For example, the laser 011 in the light source system 01 may emit a laser beam, which is first combined by the light combining lens 012 and then reflected by the second reflecting mirror 013 to enter the optical illumination system; then, transmitted in an optical illumination system; finally, the modulated signal is transmitted to the projection lens 02 through the light splitting assembly 200 by the LCOS300, so as to project an image.

In summary, the present application provides a laser projection apparatus, including: light source system, optical lighting system and projection lens. Because the arrangement directions of the light combining lens group and the first reflector in the light source system are parallel to the arrangement directions of the optical lenses in the projection lens, and the arrangement directions of the light homogenizing assembly and the light splitting assembly in the optical illumination system are vertical to the arrangement directions of the optical lenses. Therefore, the arrangement of the light source system, the optical illumination system and the projection lens is compact, and the width of the laser projection equipment in the first direction is smaller and the width of the laser projection equipment in the second direction is smaller. Thus, the volume of the whole laser projection device can be small.

Optionally, please refer to fig. 8, and fig. 8 is a schematic structural diagram of a light source system according to an embodiment of the present application. The light source system 01 may further include: a fourth spherical lens 014, a fifth spherical lens 015, and a diffusion sheet 016 disposed between the fourth spherical lens 014 and the fifth spherical lens 015. The diffusion sheet 016 can homogenize the incident laser beam and emit the homogenized laser beam to the light guide 100 a. For example, the fifth spherical lens 015 may be a super-spherical lens, through which the laser beam is converged and then enters the light tunnel 100 a.

In the embodiment of the present application, the number of the lasers 011 and the light combining lens groups 012 in the light source system 01 can be two, and the two lasers and the two light combining lens groups are in one-to-one correspondence. The arrangement direction of each laser and the corresponding light combination lens group is perpendicular to the arrangement direction of the light combination lens group and the first reflector. Wherein, the laser beam emitted by each laser comprises red laser, blue laser and green laser. For example, the two lasers 011 can include: the two optical combining lens assemblies 012, which include a first laser 011a and a second laser 011b, can include: a first light combining lens unit 012a and a second light combining lens unit 012 b. The first optical combination lens group 012a can be located at the light emitting side of the first laser 011a, and the arrangement direction of the first laser 011a and the first optical combination lens group 012a is perpendicular to the arrangement direction of the first optical combination lens group 012a and the second mirror 013; the second optical combination unit 012b can be located at the light-emitting side of the second laser 011b, and the arrangement direction of the second laser 011b and the second optical combination unit 012b is perpendicular to the arrangement direction of the second optical combination unit 012b and the second reflecting mirror 013.

For example, the first light combining lens group 012a may include: the lens comprises a first lens L1, a second lens L2 and a third lens L3 which are sequentially arranged along a first direction. The orthographic projection of the first lens L1, the orthographic projection of the second lens L2 and the orthographic projection of the third lens L3 at least partially coincide on an object plane, which is a plane perpendicular to the first direction. In this way, the first laser 011a is configured to emit blue laser light and green laser light to the first lens L1 and the second lens L2, and to emit red laser light to the third lens L3. For example, a first laser 011a can be used to emit green laser light to the first mirror L1, and a first mirror L1 is used to reflect the green laser light to the second mirror 013; the first laser 011a can be used to emit blue laser light to the second mirror L2, and the second mirror L2 is used to reflect the blue laser light to the second mirror 013; the first laser 011a can be used to emit red laser light to the third lens L3, and the third lens L3 is used to reflect the red laser light to the second mirror 013.

In the embodiment of the present application, the first lens L1 in the first light combining mirror group 012a may be a mirror for reflecting light of all colors, or may be a dichroic sheet for reflecting green laser light and transmitting laser light of other colors; the second mirror L2 may be a dichroic plate for reflecting blue laser light and transmitting laser light of other colors; the third lens L3 may be a dichroic plate for reflecting red laser light and transmitting laser light of other colors.

In the present application, the polarization polarity of the blue laser light and the green laser light emitted from the first laser 011a is opposite to the polarization polarity of the red laser light. For example, the blue laser light and the green laser light are S-polarized light, and the red laser light is P-polarized light. For this, as shown in fig. 8, the light source system 01 may further include: the first polarization conversion member 017. The first polarization conversion member 017 may be disposed between the first laser 011a and the first and second lenses L1 and L2, and the first polarization conversion member 017 may be configured to convert the incident blue and green laser lights from S-polarized light to P-polarized light and emit the converted light to the first and second lenses L1 and L2, so that the polarization directions of the blue and green laser lights incident to the second mirror 013 are the same as the polarization direction of the red laser light. Therefore, the problem that color blocks exist in the formed projection picture due to different transmittance and reflectance efficiencies of the optical lens for different polarized light can be solved by adopting the laser with the uniform polarization direction to form the projection picture. For example, the first polarization conversion member 017 may be a half-wave plate, and Polarization Conversion Systems (PCS) are generally used in optical illumination systems in related art, and have an efficiency of only 70% to 80%, resulting in low efficiency of polarization conversion. The polarization state of the laser beam is converted by the half-wave plate arranged in the light source system 01, so that the polarization conversion efficiency can be effectively improved, and the size of the optical lighting system is reduced.

For example, as shown in fig. 8, the second light combining lens unit 012b may include: and the fourth lens L4, the fifth lens L5 and the sixth lens L6 are sequentially arranged along the first direction. On the object plane, the orthographic projection of the fifth lens L5, the orthographic projection of the fourth lens L4 and the orthographic projection of the sixth lens L6 at least partially coincide. In this way, the second laser 011b can be used to emit green laser light to the fifth lens L5, and the fifth lens L5 is used to reflect the green laser light to the second mirror 013; the second laser 011b can be used to emit blue laser light to the sixth lens L6, and the sixth lens L6 is used to reflect the blue laser light to the second mirror 013; the second laser 011b can be used to emit red laser light to the fourth mirror L4, and the fourth mirror L4 is used to reflect the red laser light to the second mirror 013.

In the embodiment of the present application, the fifth lens L5 in the second optical combining lens group may be a mirror for reflecting light of all colors, or may also be a dichroic sheet for reflecting green laser light and transmitting laser light of other colors; the sixth mirror L6 may be a dichroic plate for reflecting blue laser light and transmitting laser light of other colors; the fourth lens L4 may be a dichroic plate for reflecting red laser light and transmitting laser light of other colors.

The polarization polarity of the blue laser light and the green laser light emitted from the second laser 011b is opposite to that of the red laser light. For example, the blue laser light and the green laser light are S-polarized light, and the red laser light is P-polarized light. The light source system 01 may further include: the second polarization conversion member 018. The second polarization conversion member 018 may be positioned between the second laser 011b and the fifth and sixth lenses L5 and L6. The second polarization conversion member 018 may be configured to convert the incident blue laser light and green laser light from S-polarized light to P-polarized light and emit the converted light to the fifth mirror L5 and the sixth mirror L6 such that the polarization directions of the blue laser light and the green laser light incident on the first mirror are the same as the polarization direction of the red laser light. Illustratively, the second polarization conversion member 018 may be a half-wave plate.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims

1. An optical illumination system, comprising: the liquid crystal display comprises a light homogenizing assembly, a light splitting assembly, a liquid crystal silicon-attached LCOS and a compensating plate, wherein the compensating plate is positioned between the light splitting assembly and the LCOS;

2. The optical illumination system of claim 1, wherein the compensation plate is parallel to the light emitting surface of the LCOS, and the compensation plate can rotate around a central axis perpendicular to the light emitting surface of the LCOS.

3. The optical illumination system of claim 2, wherein the compensator rotates around a central axis perpendicular to the light exit surface of the LCOS by an angle ranging from minus 10 degrees to plus 10 degrees.

4. The optical illumination system of claim 1, further comprising: and the first polaroid is positioned between the light splitting component and the projection lens.

5. The optical illumination system of claim 4, further comprising: and the second polarizer is positioned between the light homogenizing assembly and the light splitting assembly.

6. The optical illumination system of claim 4, further comprising: the projection lens comprises a vibration mirror positioned between the projection lens and the first polaroid, and plate glass positioned between the first polaroid and the vibration mirror.

7. The optical illumination system of any one of claims 1 to 6, wherein the light splitting assembly comprises: the LCOS projection lens comprises a sheet-shaped light splitting lens and a polarization light splitting film located on the light splitting lens, wherein the polarization light splitting film faces a light emergent surface of the LCOS and faces an optical lens in the projection lens.

8. The optical illumination system according to any one of claims 1 to 6, characterized in that the optical illumination system further comprises: and the first spherical lens, the second spherical lens and the third spherical lens are sequentially arranged between the light homogenizing assembly and the light splitting assembly.

9. The optical illumination system of claim 8, further comprising: and the first reflector is positioned between the second spherical lens and the third spherical lens, and the arrangement direction of the second spherical lens and the first reflector is perpendicular to the arrangement direction of the third spherical lens and the first reflector.

10. A laser projection device, comprising: a light source system, an optical illumination system and a projection lens, wherein the optical illumination system is the optical illumination system of any one of claims 1 to 9.