CN215117147U

CN215117147U - Optical engine and laser projection apparatus

Info

Publication number: CN215117147U
Application number: CN202121584685.0U
Authority: CN
Inventors: 王宇; 梁凯华
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2021-12-10
Anticipated expiration: 2031-07-12

Abstract

The application discloses optical engine and laser projection equipment belongs to laser projection technical field. The optical engine comprises a light homogenizing component, a light path component, a light valve component and a lens component. Wherein, first speculum and the optical axis of the even light subassembly in the optical engine of optical path subassembly and lens subassembly can the deflection for the optical axis of even light subassembly is parallel with the second optical axis in the lens subassembly, can reduce the width of optical engine, and then can reduce the volume of optical engine, can solve the great problem of volume of optical engine among the correlation technique, can reach the effect of reducing the volume of optical engine.

Description

Optical engine and laser projection apparatus

Technical Field

The present application relates to the field of laser projection technology, and in particular, to an optical engine and a laser projection apparatus.

Background

The laser projection display technology is a novel projection display technology in the current market. Compared with the light-emitting diode (LED) projection product, the laser projection display technology has the characteristics of high picture contrast, clear imaging, bright color and higher brightness. These remarkable features gradually make laser projection display technology a further mainstream development direction in the market.

One optical engine in the related art includes a light source, an optical path component, and a lens, and a light beam emitted from the light source is directed to the optical path component. The light path component is used for guiding the processed light beam to the lens after processing.

However, the width of the optical engine in the related art is large, which in turn results in a large volume of the optical engine.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an optical engine and a laser projection device. The technical scheme is as follows:

according to an aspect of the present application, there is provided an optical engine including: the light homogenizing component, the light path component, the light valve component and the lens component are sequentially arranged along the light path direction;

the dodging assembly is used for guiding the received light beam to the light path assembly, and the light path assembly comprises a first reflecting mirror which is used for guiding the received light beam to the light valve assembly;

the lens assembly is used for receiving the light beam guided out by the optical valve assembly along a first optical axis, performing light path turning on the received light beam, and transmitting and guiding the light beam after the light path turning along a second optical axis;

wherein the optical axis of the dodging component is parallel to the second optical axis.

Optionally, the first mirror is configured to receive the light beam transmitted along a first direction and to guide out the received light beam along a second direction, and the first direction is perpendicular to the second direction.

Optionally, the optical path component further comprises a first lens, a second reflector and a third lens;

the first lens is used for receiving the light beam emitted by the light homogenizing assembly and guiding the light beam to the first reflector;

the second lens is used for shaping the light beam reflected by the first reflector and emitting the light beam to the second reflector;

the second reflector is used for reflecting the received light beam to the third lens;

the third lens is used for correcting the received light beam and guiding the received light beam to the light valve component;

the light valve assembly comprises a light valve and a prism unit;

the prism unit is used for guiding the light beam received from the third lens to the light valve and guiding the light beam reflected by the light valve out of the light valve assembly;

wherein an optical axis of the second lens is perpendicular to an optical axis of the first lens.

Optionally, a first plane defined by the optical axis of the first lens and the optical axis of the second lens is not coplanar with a second plane defined by the optical axis of the third lens and the first optical axis.

Optionally, the first plane is perpendicular to the second plane.

Optionally, the second lens and the third lens are both plano-convex spherical lenses.

Optionally, a surface of the third lens close to the prism unit is a plane, and a surface of the second lens far from the second reflecting mirror is a plane.

Optionally, an angle of an optical axis of the third lens to an optical axis of the second lens ranges from [90 °, 110 ° ].

Optionally, the transmission direction of the light beam guided out by the light valve assembly is perpendicular to the second optical axis.

According to another aspect of the present application, there is provided a laser projection apparatus including the optical engine described above.

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

an optical engine is provided that includes a dodging assembly, an optical path assembly, an optical valve assembly, and a lens assembly. Wherein, first speculum and the optical axis of the even light subassembly in the optical engine of optical path subassembly and lens subassembly can the deflection for the optical axis of even light subassembly is parallel with the second optical axis in the lens subassembly, can reduce the width of optical engine, and then can reduce the volume of optical engine, can solve the great problem of volume of optical engine among the correlation technique, can reach the effect of reducing the volume of optical engine.

Drawings

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

FIG. 1 is a schematic diagram of an optical engine;

FIG. 2 is a schematic structural diagram of an optical engine according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of the optical engine of FIG. 2 in one orientation;

FIG. 4 is a schematic view of the optical engine of FIG. 2 in another orientation;

FIG. 5 is a schematic diagram of a portion of the optical engine shown in FIG. 4;

FIG. 6 is a schematic partial structural diagram of another optical engine provided in this embodiment of the present application;

FIG. 7 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present application;

fig. 8 is a schematic view of a light source module in the laser projection apparatus shown in fig. 7.

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.

Fig. 1 is a schematic structural diagram of an optical engine. The optical engine 10 includes a light source assembly 11, an illumination assembly 12, and a lens assembly 13. The light beam emitted from the light source assembly 11 is shaped by the illumination assembly 12 and then emitted to the lens assembly 13. The illumination assembly 12 includes a light valve. The optical axis of the light source assembly 11 is not parallel to the plane of the optical axis of the lens assembly 13. The lens assembly 13 includes a lens group and a reflector, and the light beam emitted from the illumination assembly 12 passes through the lens group and then is guided to the reflector by the transmission lens group, and the reflector reflects the light beam out of the lens assembly 13.

The optical axis of the light source assembly 11 is parallel to the x direction, and the length of the light source assembly 11 in the x direction is the width of the optical engine 10. The lengths of the optical path component 12 and the lens component 13 in the y direction are the lengths of the optical engine 10. The length of the lens assembly 13 in the z direction is the height of the optical engine 10.

The y direction is perpendicular to the z direction, and the x direction is perpendicular to a plane defined by the y direction and the z direction. In fig. 1, a plane defined by the y direction and the z direction is a plane parallel to the paper surface, that is, a plane where the optical axis of the light source assembly 11 is perpendicular to the paper surface. The plane defined by the y direction and the z direction is the plane on which the optical axis of the lens assembly 13 is located.

The width of the optical engine 10 is longer due to the longer length of the light source assembly 11, and the length of the optical engine 10 is longer due to the longer length of the lens assembly 13 in the y direction, which results in the larger volume of the optical engine 10.

Embodiments of the present application provide an optical engine and a laser projection apparatus, which can solve the above-mentioned problems in the related art.

As shown in fig. 2, fig. 2 is a schematic structural diagram of an optical engine according to an embodiment of the present disclosure. The optical engine 20 may include a dodging assembly 21, an optical path assembly 22, an optical valve assembly 24, and a lens assembly 23, which are sequentially disposed along an optical path direction. It should be noted that, for convenience of explaining the positional relationship of each component in the optical engine 20, the embodiment of the present application introduces a three-dimensional coordinate system. Wherein the y1 direction is perpendicular to the z1 direction, the x1 direction is perpendicular to the plane defined by the y1 direction and the z1 direction, and the dimension of the optical engine 20 in the x1 direction can be referred to as the width of the optical engine 20.

As shown in fig. 3, fig. 3 is a schematic structural diagram of the optical engine 20 shown in fig. 2 in the first direction f1 (the direction parallel to the optical axis C1 of the dodging assembly 21). The dodging assembly 21 may be used to direct the received light beam towards the light path assembly 22. The optical path assembly 22 may include a first mirror 221. First mirror 221 may be used to direct the received light beam to light valve assembly 24.

The lens assembly 23 is configured to receive the light beam guided out by the light valve assembly 24 along the first optical axis C3, perform optical path turning on the received light beam, transmit the light beam with the optical path turned along the second optical axis C2, and guide the light beam out of the lens assembly 23.

The optical axis C1 of the dodging assembly 21 is parallel to the second optical axis C2.

The first reflecting mirror 221 and the lens assembly 23 may be used to change the transmission direction of the light beam in the optical engine 20, and the optical axis C1 of the dodging assembly 21 may be parallel to the second optical axis C2 in the lens assembly 23. That is, the size of the optical axis C1 of the dodging assembly 21 in the x1 direction can be reduced by making the optical axis C1 of the dodging assembly 21 perpendicular to the x1 direction and parallel to a plane defined by the y1 direction and the z1 direction (in fig. 3, a plane defined by the y1 direction and the z1 direction is parallel to a plane of the paper). I.e., the width of the optical engine 20 in the x1 direction may be reduced. Thereby reducing the size of the optical engine 20. In fig. 3, a plane defined by the y1 direction and the z1 direction is a plane defined by the first optical axis C3 and the second optical axis C2 of the lens assembly 23.

In summary, the present application provides an optical engine including a light uniformizing assembly, an optical path assembly, an optical valve assembly, and a lens assembly. Wherein, first speculum and the optical axis of the even light subassembly in the optical engine of optical path subassembly and lens subassembly can the deflection for the optical axis of even light subassembly is parallel with the second optical axis in the lens subassembly, can reduce the width of optical engine, and then can reduce the volume of optical engine, can solve the great problem of volume of optical engine among the correlation technique, can reach the effect of reducing the volume of optical engine.

In an alternative embodiment, as shown in fig. 3, the first mirror 221 is configured to receive the light beam transmitted along the first direction f1 and guide the received light beam along the second direction f 2. The first direction f1 and the second direction f2 are perpendicular. In this way, the size of the dodging assembly 21 in the second direction f2 can be reduced. The length of the optical engine 20 in the second direction f2 can be reduced, and the volume of the optical engine 20 can be reduced. Wherein the first direction f1 and the y1 direction may be the same, and the second direction f2 and the z1 direction may be the same.

Further, as shown in fig. 3, the optical path assembly 22 may further include a first lens 222. The first lens 222 may be used for receiving the light beam emitted from the dodging assembly 21 and guiding the light beam to the first reflector 221. The light unifying assembly 21 and the first lens 222 may be coaxial.

In an alternative example, the first lens 222 may be a positive meniscus lens. The positive meniscus lens includes two curved surfaces with similar radii of curvature and has a positive focal length. The first lens 222 may be used to converge the light beam and also to correct curvature of field, in which case the light beam may be incident on the concave surface of the first lens 222.

As shown in fig. 4, fig. 4 is a schematic structural diagram of the optical engine shown in fig. 2 when viewed along the optical axis of the light source module, and the light path module 22 may further include a second lens 223. The second lens 223 may be used to shape the received light beam. The second lens 223 may be used to converge the light beam emitted from the light source assembly 21.

As shown in fig. 3, the optical axis C4 of the second lens 223 is perpendicular to the optical axis C1 of the first lens 222 (in fig. 3, the optical axis C1 of the first lens 222 is parallel to the first direction f 1). With this arrangement, the size of the light unifying unit 21 and the first lens 222 in the second direction f2 can be reduced, so that the overall size of the light unifying unit 21 and the light path unit 22 can be reduced, and the size of the optical engine 20 can be reduced.

As shown in fig. 4, the optical path assembly 22 may further include a second mirror 224 and a third lens 225. The second mirror 224 may be configured to receive the light beam emitted from the second lens 223 and reflect the received light beam toward the third lens 225. The second reflector 224 can fold the illumination light path, so as to satisfy the light incident requirement of the light valve assembly 24, and adjust the relative position relationship between the light path assembly 22 and the light valve assembly 24. The light beam reflected by the first mirror in the optical path assembly 22 can be made parallel to the light beam emitted from the optical valve assembly 24, and the size of the optical engine 20 in the x1 direction can be reduced, so that the volume of the optical engine 20 is optimized.

Third lens 225 may be used to correct the received beam and direct the received beam to light valve assembly 24, and third lens 225 may be used to correct beam distortion and may further focus the beam, adjust the spot distribution, and balance the optical path lengths of the fields of view.

The light valve assembly 24 may include a light valve 241 and a prism unit 242. The light valve 241 may be a Digital Micromirror Device (DMD), for example. The digital micromirror device can be regarded as an optical switch composed of many micromirrors, i.e., the turning of the micromirrors is used to realize the opening and closing of the optical switch. The number of the lenses is determined by the display resolution, and one small lens corresponds to one pixel. The micromirror is the smallest unit of operation and is also critical to its performance. The micro-mirrors are very small but still have a complex mechanical structure different from liquid crystal-each micro-mirror has a separate support frame and performs positive or negative n degrees (n > 0) deflection around the hinge tilt axis. Two electrodes are arranged at two corners of the micro mirror, and the deflection of the micro mirror can be controlled by voltage.

The micromirrors operate by reflecting light. When the micro-mirror is in an On State (i.e., the micro-mirror deflects by + n degrees), the incident angle of the incident light (light source) reaches n degrees, and the reflection angle also reaches n degrees (the sum of the incident angle and the reflection angle is 2n degrees), at this time, the energy of the light which can be received by the lens is the largest. If the micro-mirror is deflected to the Off State (i.e., the micro-mirror deflects by-n degrees), the energy of the light received by the lens is minimum, and the brightness is minimum.

The light valve may be a 0.47 inch dmd or a 0.66 inch dmd. Other sizes of digital micromirror devices are also possible, and the embodiments of the present application do not limit this.

The digital micromirror device may include a chip and a cover glass covering both sides of the chip. The protective glass can be used for preventing dust and water vapor from entering the chip.

Prism unit 242 may be used to direct light beams received from third lens 225 toward light valve 241 and to direct light beams reflected by light valve 241 out of light valve assembly 24. The prism unit 242 may be a Total Internal Reflection (TIR) prism. Total internal reflection is an optical phenomenon in which, when a light ray passes through two media having different refractive indexes, part of the light ray is refracted at an interface of the media, and the rest is reflected. However, when the angle of incidence is greater than the critical angle (the light rays are far from normal), the light rays will stop entering the other interface and will be totally reflected towards the inner surface. This phenomenon only occurs when light enters an optically denser medium (a medium with a higher refractive index) into an optically thinner medium (a medium with a lower refractive index). When the angle of incidence is greater than the critical angle, it is called total internal reflection because it is not refracted (the refracted ray disappears) but is reflected.

The prism unit 242 may include two prisms, may be used to change the path of the light beam in the optical engine 20, and may separate the illumination light beam and the image light beam in the optical engine 20.

As shown in fig. 5, fig. 5 is a partial structural diagram of the optical engine shown in fig. 4, the prism unit 242 may include a first prism 2421 enclosed by the first light incident surface D1, the reflecting surface D2 and the light valve light incident surface D3, and a second prism 2422 enclosed by the second light incident surface D4, the light emitting surface D5 and the bottom surface D6. The reflective surface D2 and the second incident surface D4 may be oppositely disposed. The third lens 225 may be located outside the first light incident surface D1, the light valve 241 may be located outside the light incident surface D3, and the lens assembly may be located outside the light exiting surface D5.

The first light incident surface D1 may be configured to receive the illumination beam exiting from the third lens 225 and direct the illumination beam to the reflective surface D2. The reflecting surface D2 may be used to reflect the illumination beam to the light valve entrance surface D3 to enter the light valve 241 through the light valve entrance surface D3. The light valve entrance surface D3 may be used to receive the image beam processed by the light valve 241 and direct the image beam to the reflecting surface D2. The image light beam may pass through the reflection surface D2, the second incident surface D4 and the light-emitting surface D5 to exit the prism unit 242, and be incorporated into the incident lens assembly.

In an alternative embodiment, as shown in fig. 3, the light beams from the light valve assembly 24 travel in a direction perpendicular to the second optical axis C2. In this way, the size of the lens assembly in the second direction f2 can be reduced, so that the size of the optical engine 20 in the second direction f2 can be reduced, and the volume of the optical engine 20 can be reduced.

In an alternative embodiment, as shown in fig. 3, the lens assembly 23 may include a third reflector 231, a first mirror group 232, and a fourth reflector 233. Third mirror 231 may be used to receive the light beam directed from light valve assembly 24 and direct the light beam to first mirror group 232. First mirror group 232 may be configured to receive the light beams reflected by third mirror 231 and direct the light beams to fourth mirror 233. Fourth mirror 233 may be used to direct the light beam out of lens assembly 23. The optical axis of the first lens group 232 is the second optical axis C2.

In an alternative example, the lens assembly 23 further includes a second lens group 234. The second mirror group 234 is used for receiving the light beam from the light valve assembly 24 and directing the light beam to the third mirror 231. The optical axis of the second lens group 234 is the first optical axis C3.

Optionally, the folding angle of the lens assembly 23 is α, i.e., α is the angle between the first optical axis C3 of the second lens group 234 and the second optical axis C2 of the first lens group 232. β is an angle between a normal line of the first mirror 221 and the optical axis C1 of the first lens 222. α and β satisfy the following formula:

α+2β＝180°；

that is, the optical axis C1 of the dodging assembly 21 and the first lens 222 may be parallel to the second optical axis C2 of the first lens group 232 in the lens assembly 23, and the first optical axis C3 of the second lens group 234 may be parallel to the optical axis C4 of the second lens 223.

The first optical axis C3 of the second lens group 234 is perpendicular to the second optical axis C2 of the first lens group (in fig. 3, the optical axis C2 of the first lens group is parallel to the first direction f 1). With such a structure, the size of the lens assembly 23 in the second direction f2 can be reduced, so that the overall size of the lens assembly 23 can be reduced, and the volume of the optical engine 20 can be reduced.

Alternatively, in the first lens group 232 of the lens assembly 23, the lenses arranged along the optical path are the fourth lens and the fifth lens, respectively, and may be used for shaping the light and correcting the aberration. The fourth mirror 233 in the lens assembly 23 may be an aspheric mirror, and may be used to fold light and correct aberrations. In the second lens group 232 of the lens assembly 23, the lenses arranged along the optical path are the sixth lens and the seventh lens, respectively, and can be used for shaping light and correcting aberration.

It should be noted that the lenses in the lens assembly in the embodiment of the present application may also be other types of lenses, and the lens assembly may also include other numbers of lenses, which is not limited in the embodiment of the present application.

As shown in fig. 5, the sixth lens 2341 in the lens assembly may be configured to receive the light beam emitted from the light emitting surface D5 of the prism unit 242, and the light emitting surface D5 may be perpendicular to the optical axis C3 of the sixth lens 2341. The light emitting surface D5 is perpendicular to the optical axis C3 of the sixth lens 2341, so that the light emitting surface D5 emits image beams at different positions of the light valve 241, and the traveling distances between the light emitting surface D5 and the sixth lens 2341 are equal, thereby improving the projection quality. An optical axis of the sixth lens element 2341 is the first optical axis of the second lens group.

Optionally, the light valve entrance surface D3 of the first prism 2421 may be parallel to the light exit surface D5 of the second prism 2422. The light paths of the light beams emitted from different regions of the light valve 241 in the prism unit 242 can be the same, and the projection quality can be improved.

Alternatively, a first plane defined by the optical axis of the first lens element and the optical axis of the second lens element (the first plane is a plane parallel to the plane of the paper illustrated in fig. 3) is not coplanar with a second plane defined by the optical axis of the third lens element and the first optical axis of the second lens group (the second plane is a plane parallel to the plane of the paper illustrated in fig. 4). The first plane and the second plane are not coplanar, which can further reduce the size of the optical engine in the first direction f 1.

Alternatively, as shown in fig. 3, the first plane is perpendicular to the second plane. In this way, the optical path assembly 22 and the optical valve assembly 24 do not affect the size of the optical engine 20 in the first direction f1 (the direction parallel to the optical axis C1 where the first lens 222 is located), and the size of the optical engine 20 in the first direction f1 can be further reduced.

Alternatively, as shown in fig. 4, the second lens 223 and the third lens 225 are both plano-convex spherical lenses. Plano-convex spherical lenses are easier to process than aspherical lenses. The difficulty of manufacturing the optical engine 20 can be reduced. The spherical lens is a lens with a curved surface and a circular-arc cross-section curve, i.e. an optical element composed of two coaxial refractive curved surfaces, and can be usually made of optical glass by grinding. Both refractive surfaces of most lenses are spherical, and one refractive surface of a partial lens may be a flat surface. Lenses can be classified into two types, convex lenses and concave lenses. The convex lens has a central portion thicker than an edge portion, and the concave lens has a central portion thinner than an edge portion. The convex lens may converge the light and may be referred to as a "converging lens". A concave lens may act to diverge light rays and may be referred to as a "diverging lens". A single convex lens can image either real or virtual images, but a single concave lens can only image virtually.

As shown in fig. 4, in an alternative example, a surface of the third lens 225 close to the prism unit 242 is a flat surface, and a surface of the second lens 223 far from the second reflecting mirror 224 is a flat surface. The plane of the third lens 225 and the plane of the second lens 223 simultaneously face away from the second mirror 224. So configured, the third lens 225 and the second lens 223 can be used to correct aberrations. The plane of the third lens 225 may be parallel to the light incident surface of the prism unit 242.

Alternatively, the angle e from the optical axis C5 of the third lens 225 to the optical axis C4 of the second lens 223 ranges from [90 °, 110 ° ]. So configured, the third lens 225 can balance the optical path of the field of view and reduce the spot size of the light beam. The plane of the second lens 223 may be parallel to the plane of the display surface of the light valve 241, so that the size of the optical path assembly 22 and the optical valve assembly 24 in the second direction f2 may be further reduced, and the size of the optical engine 20 in the second direction f2 may be reduced, thereby reducing the size of the optical engine 20.

In an alternative implementation manner, as shown in fig. 6, fig. 6 is a partial structural schematic diagram of another optical engine provided in the embodiment of the present application. The plane of the third lens 225 may be cemented with the light incident surface D1 of the prism unit 242, the size of the space between the third lens 225 and the prism unit 242 may be reduced, and the optical engine may be miniaturized.

Optionally, as shown in fig. 6, the optical engine provided in the embodiment of the present application may further include a galvanometer 226. The galvanometer 226 may be placed between the light valve 241 and the prism unit 242. The light valve 241 modulates the received light beam and directs the modulated light beam to the galvanometer 226, and the galvanometer 226 processes the light beam emitted from the light valve 241 and directs the processed light beam to the prism unit 242, and directs the processed light beam to the lens through the prism unit 242.

The galvanometer 226 may include an optical lens and a driving component, and the driving component may drive the optical lens to swing continuously, and the optical lens may change the direction of the light beam accordingly.

For example, when the light beam incident on the galvanometer is a parallel light beam (i.e., the incident angle of each light ray in the light beam is the same), the displacement distance of each pixel of the projection image corresponding to the image light beam is equal after the optical lens in the galvanometer swings from one position to another position. The offset of each visual field in the projection lens to the projection screen is consistent, so that high-resolution display of visual pictures can be ensured. Wherein the offset of the field of view refers to the actual displacement distance of the field of view. The 2k or 3k resolution can be converted into 4k resolution through the rotation of the galvanometer, and the design difficulty of the system is reduced.

After the galvanometer is applied, the light valve with the resolution of 2K can also achieve the resolution of 4K by matching with the galvanometer. The 3k resolution light valve can also achieve 4k resolution by matching with a galvanometer.

Alternatively, as shown in fig. 3, the dodging assembly 21 may be used to shape and homogenize the laser spot incident from the light source. Homogenizing refers to shaping a light beam with non-uniform intensity distribution into a light beam with uniform cross-section distribution through light beam transformation. Speckle refers to the interference of light beams to form bright or dark spots, creating random grainy intensity patterns, when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission.

The light homogenizing assembly may include a light guide, which is a tubular device formed by splicing four planar reflecting sheets, i.e. a hollow light guide. The light is reflected for many times in the light guide pipe to achieve the effect of light uniformization. The hollow light guide pipe is mainly composed of four optical elements, the four optical elements can be fixed by using a jig during assembly, and then glue for bonding is coated on the joint of the optical elements to enable the four optical elements to be mutually jointed. Because the inner surface of the first hollow light pipe is provided with the reflecting layer, after the light beam emitted by the light source enters the first hollow light pipe through the light inlet of the first hollow light pipe, the light beam is reflected for multiple times through the reflecting layer and then is output from the light outlet of the first hollow light pipe, and the light brightness can be uniformized. The inner wall of the first hollow light pipe may also be coated with a reflective material, such as silver, which may be used to transmit the light beam. The light guide pipe can also adopt a solid light guide pipe, and the light inlet and the light outlet of the light guide pipe are rectangular with the same shape and area. The light beam enters from the light inlet of the light guide pipe and then is emitted to the light valve from the light outlet of the light guide pipe, and the light beam homogenization and the light spot optimization are completed in the process of passing through the light guide pipe. The solid light pipe may be quartz.

In addition, the dodging assembly may also include a fly-eye lens, which is generally formed by combining a series of small lenses, two rows of fly-eye lens arrays are arranged in parallel to divide the light spot of the input laser beam, and the divided light spots are accumulated by a subsequent focusing lens, so that the light beam is homogenized and the light spot is optimized.

In an optical engine, the light homogenizing component may be at least one of a light pipe or a fly-eye lens, and the embodiments of the present application are not limited herein.

As shown in fig. 7, fig. 7 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present application, where the laser projection apparatus 30 includes a screen 31 and the optical engine 20 provided in any of the above embodiments.

The central point of the screen 31 may be located on the optical axis of the light beam emitted from the optical engine 20, so that the display image formed on the screen 31 by the light beam emitted from the optical engine 20 is centered, thereby ensuring the image display effect of the screen 31.

The optical engine 20 provided by the embodiment of the present application is provided with a first reflecting mirror by setting up the optical path component, and a second reflecting mirror is arranged in the lens component. By deflecting the optical axes of the optical path component and the lens component in the optical engine 20 with the first reflector and the second reflector, the optical axes of the light homogenizing component and the first lens are parallel to the optical axis of the first lens group in the lens component, so as to reduce the volume of the optical engine 20.

Alternatively, the optical axis of the first lens group in the lens assembly may be perpendicular to the screen.

As shown in fig. 8, fig. 8 is a schematic structural diagram of a light source module in the laser projection apparatus shown in fig. 7, and a light source module 26 may be further included in the optical engine. The light homogenizing element in the optical engine may be a light pipe 211. The light source module 26 may include a first laser 261, a second laser 262, and a third laser 263, and illustratively, the first laser 261 may emit blue laser light, the second laser 262 may emit green laser light, and the third laser 263 may emit red laser light.

The light source module 26 may further include a first light combining mirror 264 and a second light combining mirror 265, the first color laser beam emitted from the first laser 261 and the second color laser beam emitted from the second laser 262 may be vertically aligned, the first color laser beam and the second color laser beam are combined by the first light combining mirror 264, the light combining mirror 264 may include a reflecting mirror with a gap, the reflecting mirror may allow the first color laser beam to directly pass through and reflect the second color laser beam, and the second color laser beam may be reflected by the first light combining mirror and then travel in the same direction as the first color laser beam. The first light combiner 264 may be a single dichroic mirror, and has a function of transmitting the laser beam of the first color and reflecting the laser beam of the second color.

The first color laser beam and the second color laser beam passing through the first light combining mirror 264 are combined with the third color laser beam again by the second light combining mirror 265, and finally the three color laser beams are emitted in the same direction.

The light source module 26 may further include a beam-shrinking lens group 266, a rectangular mirror 267 and a condensing lens 268, the beam-shrinking lens group 266 may be configured to shrink the beam emitted from the laser and guide the beam to the rectangular mirror 267, the rectangular mirror 267 may change the propagation direction of the beam, and the layer size of the light source module in the length direction of the light guide 211 may be reduced.

Compared with an LED light source, the laser light source can reach a higher color gamut level. The light source unit in the embodiment of the present application may include a light converter that receives laser light from the laser light source and converts the laser light into visible light of various colors to be provided to the light unifying unit.

The current projection equipment is implemented by Digital Light Processing (DLP), which is a technology that images signals are digitally processed and then Light is projected, and Liquid Crystal Display (LCD). The LCD uses the electro-optical effect of liquid crystal, controls the transmissivity and reflectivity of the liquid crystal unit through a circuit, thereby generating images with different gray levels and colors, and the main imaging device of the LCD is a liquid crystal panel, which amplifies the light on the red, green and blue liquid crystal panels through a lens and transmits the light through a reflector. In the DLP working mode, light rays are subjected to color mixing after being rotated at a high speed by the color wheel and finally transmitted out through the prism. However, in both of these methods, a bulb is used, which has a long life and has relatively low picture brightness and color purity.

Laser projection equipment in this application embodiment, for two kinds of projection equipment of LCD and DLP, working life is longer, can not lead to screen brightness to become dark because of long-time work, and the colour gamut is more extensive.

To sum up, the embodiment of the present application provides a package laser projection equipment, wherein, first speculum and the lens subassembly in the optical engine can the optical axis of dodging subassembly and lens subassembly in the optical engine of deflection for the optical axis of dodging subassembly is parallel with the second optical axis in the lens subassembly, can reduce the width of optical engine, and then can reduce the volume of optical engine, can solve the great problem of volume of optical engine in the correlation technique, can reach the effect of reducing the volume of optical engine.

In this application, the terms "first," "second," "third," "fourth," "fifth," "seventh," and "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical engine is characterized by comprising a light homogenizing assembly, an optical path assembly, an optical valve assembly and a lens assembly which are sequentially arranged along an optical path direction;

2. The optical engine of claim 1, wherein the first mirror is configured to receive the light beam transmitted along a first direction and to guide the received light beam along a second direction, and the first direction is perpendicular to the second direction.

3. The optical engine of claim 2, wherein the optical path assembly further comprises a first lens, a second mirror, and a third lens;

the light valve assembly comprises a light valve and a prism unit;

4. A light engine as recited in claim 3, wherein a first plane defined by the optical axis of the first lens and the optical axis of the second lens is non-coplanar with a second plane defined by the optical axis of the third lens and the first optical axis.

5. A light engine as recited in claim 4, wherein the first plane is perpendicular to the second plane.

6. The optical engine of claim 3, wherein the second lens and the third lens are each plano-convex spherical lenses.

7. An optical engine as recited in claim 6, wherein a side of the third lens that is proximate to the prism unit is planar and a side of the second lens that is distal from the second mirror is planar.

8. A light engine as recited in claim 3, wherein the angle from the optical axis of the third lens to the optical axis of the second lens ranges from [90 °, 110 ° ].

9. A light engine as recited in any one of claims 1-8, wherein the light beam directed by the light valve assembly travels in a direction perpendicular to the second optical axis.

10. A laser projection device comprising the optical engine of any of claims 1 to 9.