CN114690524A - Optical illumination system and laser projection equipment - Google Patents

Abstract

The application discloses an optical lighting system and a laser projection device, which belong to the field of projection display. The optical lighting system includes: a homogenizing component, a light splitting component, an LCOS and a compensation film. Since the optical lighting system only uses a single piece of LCOS to modulate the laser beam, the number of other optical devices used in conjunction with it is also small. Therefore, the number of optical devices included in the optical lighting system is reduced, and the volume of the entire optical lighting system is reduced. In this way, the overall volume of the laser projection device integrated with the optical illumination system is reduced. In addition, since a compensation plate is arranged between the spectroscopic component and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, that is, the pre-tilt angle can be compensated, so that the S-polarization after passing through the compensation plate The purity of the light is high, which in turn improves the contrast of the optical lighting system.

Description

Optical lighting system and laser projection equipment

technical field

The present application relates to the field of projection display, and in particular, to an optical lighting system and a laser projection device.

Background technique

With the development of optoelectronic technology, the requirements for the projection screen of laser projection equipment are getting higher and higher. At present, in order to ensure the display brightness of the projection screen, a laser is usually used to provide illumination for the laser projection equipment. The laser beam emitted by the laser has the advantages of good monochromaticity and high brightness, and is an ideal light source.

At present, laser projection equipment usually includes: a laser light source, an illumination system and a projection lens. The lighting system usually includes: a uniform light component, a relay lens group, a dichroic mirror group, a reflector group, and three liquid crystal on Silicon (English: Liquid Crystal on Silicon; abbreviation: LCOS) (for example, red LCOS, green LCOS and blue LCOS) LCOS), polarization beamsplitter (English: polarization beamsplitter, PBS for short) group (including three PBS corresponding to three LCOS one-to-one) and X-type chromatic prism. The light beam emitted by the laser light source is homogenized by the homogenizing component, and then passes through the relay lens group, the dichroic mirror group and the reflector group to form red, green and blue three-color lasers. The three LCOS modulate different colors of laser light and guide it to the X-shaped color combination prism. The X-shaped color combination prism synthesizes the red, green and blue light into white light, and then projects the image on the screen through the projection lens to realize the color of the image. show.

However, the current illumination system contains many optical devices, which leads to a larger volume of the entire illumination system, which in turn leads to a larger volume of the entire laser projection device.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an optical lighting system and a laser projection device. The problem of the large volume of the laser projection equipment in the prior art can be solved, and the technical solution is as follows:

In one aspect, an optical lighting system is provided, the optical lighting system comprising:

a uniform light component, a light splitting component, a liquid crystal with silicon LCOS and a compensation sheet, the compensation sheet is located between the light splitting component and the LCOS;

The homogenizing assembly is used to homogenize the laser beam emitted by the light source system, and guide the homogenized laser beam to the beam splitting assembly, and the beam splitting assembly is used to guide the homogenized laser beam to the LCOS, the LCOS is used to modulate the uniform laser beam, the compensation plate is used to adjust the polarization state of the laser beam modulated by the LCOS, and the spectroscopic component is also used to adjust the polarization state The rear laser beam is directed to the projection lens.

In another aspect, a laser projection device is provided, the laser projection device comprising:

A light source system, an optical illumination system, and a projection lens, wherein the optical illumination system is any one of the above-mentioned optical illumination systems.

The beneficial effects brought by the technical solutions provided in the embodiments of the present application include at least:

A laser projection equipment includes: a homogenizing component, a light splitting component, LCOS and a compensation film. Since the optical illumination system only uses a single LCOS to realize the modulation of the laser beam, the number of other optical devices used in conjunction with it is also small. (For example, only one polarizing beam splitter prism is needed). Therefore, the number of optical devices included in the optical lighting system is reduced, and the volume of the entire optical lighting system is reduced. In this way, the overall volume of the laser projection device integrated with the optical illumination system is reduced. In addition, since a compensation plate is arranged between the spectroscopic component and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, that is, it can compensate the pre-tilt angle, so that the S-polarized light after passing through the compensation plate can be adjusted. The purity is higher, thereby improving the contrast of the optical lighting system.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of an optical lighting system provided by an embodiment of the present application;

Fig. 2 is an axonometric view of the optical illumination system shown in Fig. 1;

3 is an axonometric view of another optical lighting system provided by an embodiment of the present application;

4 is a front view of a compensation sheet provided by an embodiment of the present application;

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

6 is a schematic structural diagram of a laser projection device provided by an embodiment of the present application;

7 is an isometric view of the 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 provided by an embodiment of the present application.

Specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the concepts of the present application in any way, but to illustrate the concepts of the present application to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic structural diagram of an optical lighting system provided by an embodiment of the present application, and FIG. 2 is an isometric view of the optical lighting system shown in FIG. 1 . The optical lighting system may include: a uniform light component 100 , a light splitting component 200 , a liquid crystal on silicon (English: Liquid Crystal on Silicon; LCOS for short) 300 and a compensation sheet 400 .

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

The homogenizing component 100 in the optical illumination system can be used to homogenize the laser beam emitted by the light source system in the laser projection device, and guide the homogenized laser beam to the beam splitting assembly 200 . The light splitting assembly 200 can be used to guide the homogenized laser beam to the LCOS 300 , and the LCOS 300 can be used to modulate the homogenized laser beam of the homogenized light 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 beam splitter assembly 200 can also be used to guide the laser beam adjusted by the compensation sheet 400 to a projection lens in the laser projection device, and the projection lens can be used to project the laser beam modulated by the LCOS 300 into an image. In this way, when the P-polarized light in the laser beam is incident on the LCOS 300, the S-polarized light is reflected after being modulated by the LCOS 300. However, the LCOS300 has a certain pre-tilt angle, so that the reflected light of the LCOS300 is not pure S-polarized light after modulation. The compensation sheet 400 can adjust the polarization state of the laser beam modulated by the LCOS 300, that is, it can compensate the pre-tilt angle, so that the purity of the S-polarized light after passing through the compensation sheet 400 is higher, thereby improving the optical illumination system contrast.

In the application, the LCOS 300 used in the optical illumination system is a single piece. The display principle of LCOS is: the incident P-polarized light is irradiated on the LCOS chip. Under the control of the driving circuit, when the applied voltage on both sides of the liquid crystal layer in the LCOS chip is 0, the input P-polarized light passes through the liquid crystal layer. The polarization direction is not deflected, and reaches the bottom of the LCOS chip and is reflected back to output P-polarized light, which returns along the original illumination light path. When there is an applied voltage on both sides of the liquid crystal layer in the LCOS chip, the input P-polarized light is deflected by the polarization direction of the liquid crystal layer, and reaches the bottom of the LCOS chip and is reflected back to output S-polarized light. The laser beam modulated by LCOS is imaged through the projection lens.

Exemplarily, the light source system can emit a laser beam, and the laser beam is transmitted in the light source system and incident into the optical illumination system; then, in the optical illumination system, the laser beam passes through the homogenizing component 100, the light splitting component 200, the compensation plate 400 and the single-chip LCOS in sequence. 300; finally, after modulated by the single-chip LCOS 300, adjusted by the compensation sheet 400, and then injected into the projection lens through the light splitting component 200 to project an image. In this case, since the optical illumination system only uses a single LCOS to modulate the laser beam, the number of other optical devices used in conjunction with it is also small (for example, only one polarizing beam splitter prism is required). Therefore, the number of optical devices included in the optical lighting system is reduced, and the volume of the entire optical lighting system is reduced. In this way, the overall volume of the laser projection device integrated with the optical illumination system is reduced. In addition, since the compensator 400 is arranged between the optical splitting component 200 and the LCOS 300, the compensator 400 can adjust the polarization state of the laser beam modulated by the LCOS 300, that is, it can compensate the pretilt angle existing in the LCOS 300, The purity of the S-polarized light after passing through the compensation sheet 400 is higher, thereby improving the contrast ratio of the optical illumination system.

To sum up, the embodiments of the present application provide an optical lighting system, which may include: a homogenizing component, a light splitting component, an LCOS and a compensator, because the optical lighting system only uses a single LCOS to realize the laser beam Modulation, the number of other optics used in conjunction with it is also less (for example, only one polarizing beam splitter prism is required). Therefore, the number of optical devices included in the optical lighting system is reduced, and the volume of the entire optical lighting system is reduced. In this way, the overall volume of the laser projection device integrated with the optical illumination system is reduced. In addition, since a compensation plate is arranged between the spectroscopic component and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, that is, the pre-tilt angle can be compensated, so that the S-polarization after passing through the compensation plate can be adjusted. The purity of the light is higher, which in turn improves the contrast of the optical lighting system.

Optionally, please refer to FIG. 3 and FIG. 4 , FIG. 3 is an isometric view of another optical lighting system provided by an embodiment of the present application, and FIG. 4 is a front view of a compensation sheet provided by an embodiment of the present application. The compensation sheet 400 in the optical illumination system can be parallel to the light-emitting surface A1 of the LCOS 300 , and the compensation sheet 400 can rotate around the central axis L perpendicular to the light-emitting surface A1 of the LCOS 300 . In this case, when the LCOS 300 has different pre-tilt angles, the compensation plate 400 can be rotated to compensate for the different pre-tilt angles of the LCOS 300, which further effectively improves the contrast of the optical illumination system.

In the embodiment of the present application, the angle of rotation of the compensation sheet 400 around the central axis L perpendicular to the light-emitting surface A1 of the LCOS 300 may range from minus 10 degrees to plus 10 degrees. Exemplarily, the angle of the compensating sheet 400 rotating in the clockwise direction around the central axis L perpendicular to the light-emitting surface A1 of the LCOS 300 is positive, and the compensation sheet 400 is counterclockwise around the central axis L perpendicular to the light-emitting surface A1 of the LCOS 300 The angle of rotation is negative.

Optionally, as shown in FIG. 3 , the optical lighting system may further include: a first reflecting mirror 500 located between the homogenizing component 100 and the light splitting component 200 , the first reflecting mirror 500 , the light splitting component 200 and the LCOS 300 are arranged The arrangement direction 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 component 200 and the LCOS 300 may be the 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 lens described later. Wherein, the first reflecting mirror 500 can be used to guide the laser beam homogenized by the homogenizing assembly 100 to the beam splitting assembly 200, and the beam splitting assembly 200 can be used to transmit the laser beam homogenized by the homogenizing assembly, and will pass through the LCOS 300 The modulated laser beam is reflected to the projection lens. In this case, since there is a first reflector 500 between the homogenizing component 100 and the light splitting component 200, and the arrangement direction of the first reflector 500, the light splitting component 200 and the LCOS 300 is the same as the arrangement of the plurality of optical lenses The cloth direction is vertical. Therefore, through the first reflecting mirror 500, the laser beam homogenized by the homogenizing assembly 100 can be first reflected to the beam splitting assembly 200, that is, the turning of the optical path can be realized, the laser beam can be transmitted to the LCOS 300 through the beam splitting assembly 200, The laser beam is modulated and then reflected to the projection lens through the beam splitting component 200 . In this way, the width of the optical illumination system in the arrangement direction of the homogenizing component 100 and the first reflecting mirror 500 can be made smaller, thereby ensuring that the overall volume of the laser projection device is small, so that the laser projection device can project normally. image screen.

In the embodiment of the present application, as shown in FIG. 3 , the beam splitting component 200 in the optical illumination system may include: a sheet-shaped beam-splitting lens and a polarizing beam-splitting film on the beam-splitting lens. The film may face the light exit surface A1 of the LCOS 300 and face the plurality of optical lenses in the projection lens. For example, the sheet-shaped beam splitter lens may be a wire grid polarization beam splitter (Wire-grid Polarization Beam splitter; Wire-grid PBS for short), and the angle between the wire grid PBS and the light-emitting surface A1 of the LCOS 300 may be 45 Spend. The wire grid PBS can allow the incoming P-polarized light to pass completely, while the incoming S-polarized light is reflected at an exit angle of 45 degrees, and the polarization direction of the S-polarized light is perpendicular to the polarization direction of the P-polarized light. For example, the P-polarized light in the laser beam homogenized by the homogenizing component 100 is reflected by the first reflecting mirror 500 and then transmitted to the LCOS 300 by the wire grid PBS. The LCOS 300 modulates the P-polarized light to form S-polarized light and reflects it , the S-polarized light reflected from the LCOS 300 is reflected to the projection lens through the reflection surface of the wire grid PBS. It should be noted that the wire grid PBS can also transmit S-polarized light and reflect P-polarized light, which is not specifically limited in the embodiment of the present application.

Optionally, as shown in FIG. 3 , the direction in which the long side B1 of the LCOS 300 in the optical illumination system is located may be perpendicular to the arrangement direction of the plurality of optical lenses in the projection lens. In this case, the direction in which the long side B1 of the LCOS 300 is located is perpendicular to the arrangement direction of the plurality of optical lenses in the projection lens. Therefore, the space occupied by the LCOS 300 and the plurality of optical mirrors in the arrangement direction of the plurality of optical mirrors 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 lighting system shown in FIG. 3 . The optical illumination system in the laser projection device may further include: a first spherical lens 600 , a second spherical lens 700 and a third spherical lens 800 arranged in sequence between the homogenizing component 100 and the light splitting component 200 . In this application, the first spherical lens 600 may have a light incident surface S1 and a light exit surface S2, the light incident surface S1 of the first spherical lens 600 may be a plane, and the light exit surface S2 of the first spherical lens 600 may be a convex surface; The spherical lens 700 may have a light entrance surface S3 and a light exit surface S4, the light entrance surface S3 of the second spherical lens 700 may be a plane, and the light exit surface S4 of the second spherical lens 700 may be a convex surface; the third spherical lens 800 may have an entrance surface S3. For the light surface S5 and the light exit surface S6, the light incident surface S5 of the third spherical lens 800 may be a convex surface, and the light exit surface S6 of the third spherical lens 800 may be a flat 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 can be converged by the third spherical lens 800 .

Optionally, as shown in FIG. 3 , the first reflector 500 in the optical lighting system may be located between the second spherical lens 700 and the third spherical lens 800 , and the arrangement of the second spherical lens 700 and the first reflector 500 The direction is perpendicular to the arrangement direction of the third spherical lens 800 and the first reflecting mirror 500 . The arrangement direction of the second spherical lens 700 and the first reflection mirror 500 may be the X-axis direction in the figure, and the arrangement direction of the third spherical lens 800 and the first reflection mirror 500 may be the Z-axis direction in the figure. Exemplarily, the laser beam after homogenizing by the homogenizing component 100 is incident on the first reflecting mirror 500 through the first spherical lens 600 and the second spherical lens 700 in sequence, and then the first reflecting mirror 500 reflects the laser beam to the third spherical surface. Lens 800.

Optionally, in this embodiment of the present application, as shown in FIG. 3 , the optical lighting system may further include: a first polarizer 900 located between the light splitting component 200 and the projection lens, and the first polarizer 900 can filter out laser light Part of the polarized light in the beam increases the contrast of the optical lighting system. In addition, the first polarizer 900 can be matched with the projection screen at the rear end of the projection lens to achieve higher projection efficiency. In this application, the optical illumination system may further include: a second polarizer 1000 located between the third spherical lens 800 and the light splitting component 200 . In this case, the polarization state of the laser beam will change to a certain 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 part of the polarized light in the laser beam, thereby improving the contrast of the optical illumination system. For example, when the light source system emits P-polarized light, the P-polarized light is transmitted in the light source system and guided into the optical illumination system. During the transmission of the optical illumination system, the polarization state of part of the laser beam in the P-polarized light will change, and the second polarizer can filter out the laser beam whose polarization state has changed, thereby improving the purity of the P-polarized light.

Optionally, as shown in FIG. 3 , the optical lighting system may further include: a galvanometer 1100 located between the first polarizer 900 and the projection lens. Through the galvanometer 1100, the information carried on the laser beam emitted by the LCOS 300 can be shifted by pixels at the galvanometer 1100 and superimposed in the projection lens to achieve higher resolution.

In the embodiment of the present application, as shown in FIG. 3 , the optical lighting system may further include: a flat glass 1200 located between the first polarizer 900 and the galvanometer 1100 , through which the flat glass 1200 can be adapted to the back focus of the projection lens , so that the display effect of the image projected through the projection lens is better. It should be noted that the flat glass 1200 may or may not be provided, which is not specifically limited in this embodiment of the present application.

In the embodiment of the present application, the homogenizing component 100 in the optical illumination system may include: a light pipe 100a and a fly-eye lens (not shown in the figure), both of which can homogenize the laser beam. effect. Exemplarily, when the homogenizing component is a fly-eye lens, the fly-eye lens may include: a glass substrate, a plurality of microlenses arranged in an array on a light-incident surface of the glass substrate, and a light-emitting surface on the glass substrate A plurality of microlenses arranged in an array. The multiple microlenses on the light incident surface correspond to the multiple microlenses on the light exit surface one by one, and the shape and size of each microlens are the same as the shape and size of the corresponding microlens. Exemplarily, the plurality of microlenses on the light incident surface and the plurality of microlenses on the light emitting surface may both be spherical convex lenses or aspherical convex lenses. In this way, the plurality of microlenses on the light incident surface can divide the light spot of the laser light emitted by each laser unit. The divided light spots are accumulated through a plurality of microlenses on the light-emitting surface, so that the laser beams emitted by each laser unit can be homogenized, so as to realize the laser beams emitted by the first laser and the second laser. Homogenize.

When the homogenizing component 100 is a light pipe 100a, the light pipe 100a may be a tubular device formed by splicing four plane reflection sheets, that is, a hollow light pipe. The light is reflected multiple times inside the light pipe to achieve uniformity. For the effect of light, the light guide can also be a solid light guide. The laser beam enters from the light entrance surface of the light guide, and then exits from the light exit surface of the light guide. The beam homogenization and spot optimization are completed in the process of passing through the light guide.

It should be noted that, in the embodiments of the present application, the uniform light assembly 100 is taken as an example of the light pipe 100a for schematic illustration. In order to improve the modulation efficiency of the laser beam by the LCOS 300, it is usually necessary to ensure that the long side of the laser beam incident on the LCOS 300 corresponds to the long side of the LCOS 300, and the short side 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 embodiments of the present application. The units of the radius of curvature R and the thickness T are both in millimeters (mm).

Table 1

face number Radius of curvature R Thickness T first spherical lens gigantic 7.3 -12.1 second spherical lens gigantic 7.28 -22.3 third spherical lens -32.07 5 gigantic

As shown in Table 1, the value of the radius of curvature of the light incident surface S1 of the first spherical lens 600 is infinite, the value of the radius of curvature of the light exit surface S2 of the first spherical lens 600 is -12.1 mm, and the center of the first spherical lens 600 The value of the thickness is 7.3 mm; the value of the radius of curvature of the light incident surface S3 of the second spherical lens 700 is infinite, the value of the radius of curvature of the light exit surface S4 of the second spherical lens 700 is -22.3 mm, and the value of the curvature radius of the second spherical lens 700 The value of the central thickness 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 exit surface S6 of the third spherical lens 800 is infinite, and the The value of the center thickness is 5 mm.

In this 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 way, by reducing the value of F#, the etendue value of the optical illumination system can be increased, thereby making the projection efficiency of the laser projection device higher.

To sum up, the embodiments of the present application provide an optical lighting system, which may include: a homogenizing component, a light splitting component, an LCOS and a compensator, because the optical lighting system only uses a single LCOS to realize the laser beam Modulation, the number of other optics used in conjunction with it is also less (for example, only one polarizing beam splitter prism is required). Therefore, the number of optical devices included in the optical lighting system is reduced, and the volume of the entire optical lighting system is reduced. In this way, the overall volume of the laser projection device integrated with the optical illumination system is reduced. In addition, since a compensation plate is arranged between the spectroscopic component and the LCOS, the compensation plate can adjust the polarization state of the laser beam modulated by the LCOS, that is, the pre-tilt angle can be compensated, so that the S-polarization after passing through the compensation plate can be adjusted. The purity of the light is higher, which in turn improves the contrast of the optical lighting system.

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

In this embodiment of the present application, the light source system 01 may include: a laser 011 , a light combining mirror group 012 and a second mirror 013 . The light-combining mirror group 012 may be located on the light-emitting side of the laser 011 , and the arrangement direction of the light-combining mirror group 012 and the laser 011 may be perpendicular to the arrangement direction of the light-combining mirror group 012 and the second mirror 013 . The laser 011 can be used to emit three-color laser beams to the light combining mirror group 012 , and the light combining mirror group 012 can be used to combine the three-color laser beams and guide them to the second mirror 013 . Illustratively, the three-color lasers may include: blue laser, green laser, and red laser. It should be noted that, the embodiments in the present application are all illustratively illustrated by taking the laser 011 simultaneously emitting three colors of lasers of blue laser, green laser and red laser as an example.

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

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

For example, the laser 011 in the light source system 01 can emit a laser beam, and the laser beam is first combined by the light combining mirror group 012, and then reflected by the second mirror 013 and then enters the optical lighting system; then, the laser beam is transmitted in the optical lighting system. ; Finally, after being modulated by LCOS 300, it enters the projection lens 02 through the light splitting component 200 to project an image.

To sum up, a laser projection device provided by the implementation of this application includes: a light source system, an optical lighting system and a projection lens. Since the arrangement direction of the light combining lens group and the first reflector in the light source system is parallel to the arrangement direction of the multiple optical lenses in the projection lens, the arrangement direction of the light homogenizing components and the light splitting components in the optical illumination system is the same as The arrangement direction of the plurality of optical lenses is vertical. Therefore, the arrangement of the light source system, the optical illumination system and the projection lens is made compact, so that the width of the laser projection device in the first direction is smaller, and the width in the second direction is also smaller. In this way, the volume of the entire laser projection apparatus can be made smaller.

Optionally, please refer to FIG. 8 , which is a schematic structural diagram of a light source system provided by 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 diffuser 016 located between the fourth spherical lens 014 and the fifth spherical lens 015 . The diffusing sheet 016 can homogenize the incident laser beam and then send it to the light pipe 100a. For example, the fifth spherical lens 015 may be a hyperspherical lens, through which the laser beam is converged and then injected into the light pipe 100a.

In the embodiment of the present application, the number of the lasers 011 and the light combining mirror groups 012 in the light source system 01 may be two, and the two lasers and the two light combining mirror groups are in one-to-one correspondence. The arrangement direction of each laser and the corresponding light-combining mirror group is perpendicular to the arrangement direction of the light-combining mirror group and the first reflecting mirror. Among them, the laser beams emitted by each laser include red laser, blue laser and green laser. For example, the two lasers 011 may include: a first laser 011a and a second laser 011b, and the two light combining mirror groups 012 may include: a first light combining mirror group 012a and a second light combining mirror group 012b. The first light-combining mirror group 012a may be located on the light-emitting side of the first laser 011a, and the arrangement direction of the first laser 011a and the first light-combining mirror group 012a is perpendicular to the first light-combining mirror group 012a and the second mirror 013 The arrangement direction of the second light combining lens group 012b can be located on the light-emitting side of the second laser 011b, and the arrangement direction of the second laser 011b and the second light combining lens group 012b is perpendicular to the second light combining lens group 012b and 012b. Arrangement direction of the second mirrors 013 .

Exemplarily, the first light combining lens group 012a may include: a first lens L1, a second lens L2 and a third lens L3 arranged in sequence along the first direction. On the target plane, 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 overlap, and the target plane is a plane perpendicular to the first direction. In this way, the first laser 011a is used to emit blue laser light and green laser light to the first mirror L1 and the second mirror L2, and to emit red laser light to the third mirror L3. For example, the first laser 011a can be used to emit green laser light to the first mirror L1, and the first mirror L1 can be 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 color laser, and the second mirror L2 is used to reflect the blue laser to the second mirror 013; the first laser 011a can be used to emit red laser to the third mirror L3, and the third mirror L3 is used to reflect the red laser to the second mirror 013; The second mirror 013.

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

In the present application, the polarization polarities of the blue laser light and the green laser light emitted by the first laser 011a are opposite to that of the red laser light. For example, blue and green lasers are S-polarized light, and red lasers are P-polarized light. To this end, as shown in FIG. 8 , the light source system 01 may further include: a first polarization conversion component 017 . The first polarization conversion part 017 can be located between the first laser 011a and the first mirror L1 and the second mirror L2, and the first polarization conversion part 017 can be used to convert the incident blue laser and green laser into S-polarized light After being converted into P-polarized light, it is directed to the first mirror L1 and the second mirror L2, so that the polarization directions of the blue laser and the green laser entering the second mirror 013 are the same as the polarization direction of the red laser. In this way, the use of lasers with a uniform polarization direction to form a projection picture can avoid the problem of color blocks in the formed projection picture due to the different transflective efficiencies of optical lenses for different polarized lights. For example, the first polarization conversion component 017 may be a half-wave plate. In the related art, a polarization conversion system (English: Polerization conversion system; PCS for short) is usually used in an optical illumination system to perform polarization conversion of a laser beam, and its efficiency is only 70% to 80%, resulting in less efficient polarization conversion. In this application, a half-wave plate is used in the light source system 01 to convert the polarization state of the laser beam, which can effectively improve the efficiency of polarization conversion and reduce the volume of the optical illumination system.

Exemplarily, as shown in FIG. 8 , the second light combining lens group 012b may include: a fourth lens L4 , a fifth lens L5 and a sixth lens L6 arranged in sequence along the first direction. On the target plane, the orthographic projection of the fifth mirror L5, the orthographic projection of the fourth mirror L4, and the orthographic projection of the sixth mirror L6 at least partially coincide. In this way, the second laser 011b can be used to emit green laser light to the fifth mirror L5, and the fifth mirror L5 can be used to reflect the green laser toward the second mirror 013; the second laser 011b can be used to emit blue laser light to the sixth mirror L6 color laser, and the sixth mirror L6 is used to reflect the blue laser to the second mirror 013; the second laser 011b can be used to emit red laser to the fourth mirror L4, and the fourth mirror L4 is used to reflect the red laser to the second mirror 013; The second mirror 013.

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

The polarization polarities of the blue laser light and the green laser light emitted by the second laser 011b are opposite to that of the red laser light. For example, blue and green lasers are S-polarized light, and red lasers are P-polarized light. The light source system 01 may further include: a second polarization conversion component 018 . The second polarization conversion part 018 may be located between the second laser 011b and the fifth mirror L5 and the sixth mirror L6. The second polarization conversion component 018 can be used to convert the incident blue laser light and green laser light from S-polarized light to P-polarized light, and then emit to the fifth mirror L5 and the sixth mirror L6, so as to enter the first reflecting mirror The polarization directions of the blue and green lasers are the same as those of the red laser. For example, the second polarization conversion component 018 may be a half-wave plate.

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

The above are only optional embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of the present application. within the scope of protection.

Claims (10)

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;

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.

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.

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