CN113050355A

CN113050355A - Optical engine

Info

Publication number: CN113050355A
Application number: CN202110268039.1A
Authority: CN
Inventors: 王强
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-06-29

Abstract

The application discloses optical engine belongs to laser projection and laser light source field. The optical engine includes: light source subassembly, prism subassembly, two at least light valves and lens subassembly. The light source component emits light beams to enter at least two light valves, the light valves process the received light beams and then output the light beams to the prism component, and the prism component receives the light beams output by the light valves and emits the light beams to the lens component. The application provides an optical engine, wherein, the refracting index homogeneous phase of prism in the prism subassembly, and the light beam of two at least light valve outputs is equal at the light valve income plain noodles that get into the prism subassembly and the exit surface that jets out the prism subassembly marchs the journey route homogeneous phase, and then makes the size of the light beam of every light valve output the same when jetting out the prism subassembly. The problem that the sizes of light beams emitted by different light valves in the related art can be different when the light beams are emitted from the prism assembly to the lens is solved. The size of a plurality of light beams emitted to the lens from the prism is consistent, and therefore the imaging quality of the optical engine is improved.

Description

Optical engine

Technical Field

The present application relates to laser projection and laser light source, and more particularly to an optical engine.

Background

At present, the laser projection technology is a novel projection technology in the market, and the main advantages of the laser light source are high brightness, bright color, low energy consumption, long service life and small size, so that the laser projection technology has the characteristics of high picture contrast and clear imaging, and therefore the laser projection technology becomes the development direction of the mainstream in the market. With the development of projector technology and market, in order to make users experience better viewing and enjoying when using the projector in daytime, a projector with higher brightness is required, but the output luminous flux of the projector system with a single light valve is limited, and a multi-light valve system is required for higher luminous flux.

An optical engine is used for laser display projection equipment and comprises a light source component, a prism component, a lens and a plurality of light valves, wherein the light source component emits light beams, the light beams are emitted to the prism component, the prism component receives the light beams and then emits the light beams to the plurality of light valves, the light valves process the light beams and then emit the light beams to the prism component, and the light beams are emitted by the prism component and then enter the lens. When the optical engine is used, light beams output by a plurality of light paths corresponding to a plurality of light valves one by one enter a lens.

However, in the optical engine, the light beams emitted from different light valves may have different sizes when being emitted from the prism assembly to the lens, which may result in poor imaging quality.

Disclosure of Invention

The embodiment of the application provides an optical-mechanical system, the technical scheme is as follows:

according to an aspect of the present application, there is provided an optical engine including: the device comprises a light source component, a prism component, at least two light valves and a lens component;

the prism assembly includes: the lens assembly comprises a light emitting surface, at least two light source light incident surfaces which are in one-to-one correspondence with the at least two light valves, and at least two light valve light incident surfaces which are in one-to-one correspondence with the at least two light valves, wherein each light valve is positioned outside the corresponding light valve light incident surface, and the lens assembly is positioned outside the light emitting surface;

the light source assembly is used for respectively providing at least two beams of incident light which are in one-to-one correspondence with the at least two light valves to the at least two light source light incoming surfaces, and the prism assembly is used for respectively guiding the incident light which corresponds to each light valve to the corresponding light valve;

the light valve is used for processing the received light beam and outputting the processed light beam to the corresponding light valve light-in surface, and the prism assembly is used for guiding the light beam output by the light valve to the light-out surface and emitting the light beam to the lens assembly;

the prism assembly comprises at least two prisms, the refractive indexes of the at least two prisms are equal, and the traveling paths of the light beams output by the at least two light valves between the corresponding light valve light inlet surface and the light outlet surface are equal.

Optionally, a light engine as recited in claim 1, wherein at least two prisms of said prism assembly are made of the same material.

Optionally, the at least two light valves include a first light valve and a second light valve, the prism assembly includes a first total internal reflection prism and a second total internal reflection prism, the light source incident surface and the light valve incident surface corresponding to the first light valve are located on the first total internal reflection prism, and the light source incident surface and the light valve incident surface corresponding to the second light valve are located on the second total internal reflection prism.

Optionally, the first tir prism comprises a first triangular prism and a second triangular prism, a first face of the first triangular prism being disposed opposite a second face of the second triangular prism;

the light source light-in surface and the light valve light-in surface corresponding to the first light valve are positioned on the first prism, and the light source light-in surface and the light valve light-in surface corresponding to the first light valve and the first surface enclose the first prism;

the second triangular prism further comprises a third face, the light-emitting face is located on the second triangular prism, and the second face of the second triangular prism, the light-emitting face and the third face are enclosed to form the second triangular prism.

Optionally, the second tir prism comprises a third triangular prism and a fourth triangular prism, a fourth face of the third triangular prism being disposed opposite to a fifth face of the fourth triangular prism;

the light source light-in surface and the light valve light-in surface corresponding to the second light valve are positioned on the third prism, and the light source light-in surface and the light valve light-in surface corresponding to the second light valve and the fourth surface enclose the third prism;

the fourth triple prism still includes sixth and seventh face, the sixth with the third face of second triple prism sets up relatively, the fifth, sixth and the seventh face of fourth triple prism enclose into the fourth triple prism.

Optionally, after the light valve light incident surface on the first triangular prism receives the output light beam of the first light valve, the first triangular prism is configured to guide the received light beam to the first surface of the first triangular prism, and after the light beam is emitted out of the first triangular prism through the first surface, the light beam is emitted to the second surface of the second triangular prism;

and after the second face of the second triangular prism receives the light beam emitted from the first face, the second triangular prism is used for guiding the received light beam to the light-emitting face and emitting the light beam through the light-emitting face.

Optionally, after the light valve light incident surface on the third triangular prism receives the output light beam of the second light valve, the third triangular prism is configured to guide the received light beam to a fourth surface of the third triangular prism, and after the light beam is emitted out of the third triangular prism through the fourth surface, the light beam is emitted to a fifth surface of the fourth triangular prism;

and after the fifth surface of the fourth triangular prism receives the light beam emitted from the fourth surface, the fourth triangular prism is used for guiding the received light beam to the sixth surface and emitting the light beam to the third surface of the second triangular prism through the sixth surface, and the second triangular prism is used for guiding the light beam emitted from the third surface to the second surface, reflecting the light beam to the light emitting surface through the second surface and emitting the light beam through the light emitting surface.

Optionally, a first pitch of the first light valve is equal to a second pitch of the second light valve, the first pitch is a pitch between the first light valve and the light valve incident surface of the first triangular prism, and the second pitch is a pitch between the second light valve and the light valve incident surface of the third triangular prism.

Optionally, the lens assembly includes a light entrance lens for receiving the light beam emitted from the light exit surface, and the light exit surface is perpendicular to a main optical axis of the light entrance lens.

Optionally, an incident angle of the light beam output by the first light valve on the light exit surface is equal to an incident angle of the light beam output by the second light valve on the light exit surface.

Optionally, the light source assembly is configured to provide a light beam with a first wavelength to a light source incident surface corresponding to the first light valve, and the light source assembly is configured to provide a light beam with a second wavelength to a light source incident surface corresponding to the second light valve, where the first wavelength is different from the second wavelength.

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 light source assembly, a prism assembly, at least two light valves, and a lens assembly. The light source component emits light beams which enter at least two light valves through the prism component, the light valves are used for processing the received light beams and outputting the processed light beams to the prism component, the prism component receives the light beams output by the light valves and emits the light beams to the lens component, wherein the refractive indexes of prisms in the prism component are equal, the traveling paths of the light beams output by the at least two light valves between the light valve light-in surface entering the prism component and the light-out surface emitting out of the prism component are equal, and therefore the size of the light beams output by each light valve is the same when the light beams are emitted out of the prism component. The problem of the light beam that different light valves emitted when the size probably is different from prism subassembly directive lens, and then probably lead to the formation of image quality relatively poor is solved. The size of a plurality of light beams emitted to the lens from the prism is consistent, and therefore the imaging quality of the optical engine is improved.

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 structural diagram of an optical engine according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a portion of the optical engine shown in FIG. 1;

fig. 3 is a schematic diagram of another optical engine 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.

Currently, the brightness of projection devices can be increased using optical engines with multiple light valves. The optical engine is provided with a plurality of light paths which correspond to the light valves one by one and are used for respectively inputting light beams to the lens.

However, when the optical engine is used, the sizes of the light beams emitted from different light valves when the light beams are emitted from the prism assembly to the lens may be different, which may result in poor imaging quality. Wherein the size of the light beam can be expressed in terms of the diameter of the light beam.

The embodiment of the present application provides an optical engine, which can solve the problems existing in the related art.

As shown in fig. 1, fig. 1 is a schematic structural diagram of an optical engine according to an embodiment of the present application. The embodiment of the present application takes an example of an optical engine including two light valves, but the optical engine may also include more light valves, such as 3, 4, 5 or more. The optical engine may include: a light source assembly, a prism assembly 12, at least two light valves (illustrated in fig. 1 as a first light valve 131 and a second light valve 132), and a lens assembly 14.

The light valve may be a Digital Micromirror Device (DMD), and the DMD may include an array of high-speed digital light-reflecting mirrors. For example, the DMD may include a plurality of small mirrors, one mirror for each pixel, with the number of mirrors determining the display resolution of the DMD.

The prism assembly 12 includes: the light source module includes a light emitting surface m1, at least two light source light incident surfaces corresponding to at least two light valves one to one (fig. 1 illustrates a light source light incident surface m2 and a light source light incident surface m3 as examples), and at least two light valve light incident surfaces corresponding to at least two light valves (131 and 132) one to one (fig. 1 illustrates a light valve light incident surface m4 and a light valve light incident surface m5 as examples), where each light valve (131 and 132) is located outside a corresponding light valve light incident surface (m4 and m5), and the lens assembly 14 is located outside the light emitting surface m 1. The material of at least two prisms in the prism assembly is the same.

The light source assembly is configured to provide at least two incident lights (illustrated as incident light s1 and incident light s2 in fig. 1) corresponding to the at least two light valves (131 and 132) one by one to the at least two light source incident lights (m2 and m3), respectively, and the prism assembly 12 is configured to guide the incident light (s1 and s2) corresponding to each light valve (131 and 132) to the corresponding light valve (131 and 132), respectively.

The light valves (131 and 132) are configured to process the received light beams and output the processed light beams to corresponding light valve light incident surfaces (m4 and m5), and the prism assembly 12 is configured to guide the light beams output by the light valves (131 and 132) to the light emitting surface m1 and emit the light beams to the lens assembly 14. The light valves (131 and 132) may make the sizes of the light beams processed by them the same.

The prism assembly 12 includes at least two prisms (the prism 121 and the prism 122 are illustrated as an example in fig. 1), the refractive indexes of the at least two prisms (121 and 122) are equal, and the traveling paths of the light beams output by the at least two light valves (131 and 132) between the light valve incident surfaces (m4 and m5) and the light emitting surface m1 are equal.

The refractive index referred to in the present application may refer to a refractive index for light in a visible light range (the range may be 380nm to 780 nm). The two prisms (121 and 122) referred to herein have equal refractive indices, that is, the two prisms (121 and 122) have equal refractive indices for light rays in the visible range.

In the optical engine provided in the embodiment of the application, the sizes of the light beams output from the light valves may be equal, and since the refractive indexes of the prisms are equal and the traveling paths of the light beams are equal, the degrees of beam divergence of the light beams between the light incident surface and the light exit surface of the corresponding light valve are equal, so that the degrees of change of the light beam sizes are also equal, that is, the sizes of the light beams emitted from the prisms are equal.

In summary, embodiments of the present application provide an optical engine including a light source assembly, a prism assembly, at least two light valves, and a lens assembly. The light source component emits light beams which enter at least two light valves through the prism component, the light valves are used for processing the received light beams and outputting the processed light beams to the prism component, the prism component receives the light beams output by the light valves and emits the light beams to the lens component, wherein the refractive indexes of prisms in the prism component are equal, the traveling paths of the light beams output by the at least two light valves between the light valve light-in surface entering the prism component and the light-out surface emitting out of the prism component are equal, and therefore the size of the light beams output by each light valve is the same when the light beams are emitted out of the prism component. The problem of the light beam that different light valves emitted when the size probably is different from prism subassembly directive lens, and then probably lead to the formation of image quality relatively poor is solved. The size of a plurality of light beams emitted to the lens from the prism is consistent, and therefore the imaging quality of the optical engine is improved.

Optionally, the at least two light valves include a first light valve and a second light valve, the prism assembly includes a first total internal reflection prism and a second total internal reflection prism, the light source entrance surface and the light valve entrance surface corresponding to the first light valve are located on the first total internal reflection prism, and the light source entrance surface and the light valve entrance surface corresponding to the second light valve are located on the second total internal reflection prism.

Optionally, the first tir prism comprises a first triangular prism and a second triangular prism, the first face of the first triangular prism being disposed opposite the second face of the second triangular prism.

The light source light-in surface and the light valve light-in surface which correspond to the first light valve are positioned on the first prism, and the light source light-in surface and the light valve light-in surface which correspond to the first light valve and the first surface enclose a first prism.

The second triangular prism also comprises a third face, the light-emitting face is positioned on the second triangular prism, and the second face, the light-emitting face and the third face of the second triangular prism enclose the second triangular prism.

Optionally, the second tir prism comprises a third triangular prism and a fourth triangular prism, a fourth face of the third triangular prism being disposed opposite a fifth face of the fourth triangular prism.

The light source light-in surface and the light valve light-in surface corresponding to the second light valve are positioned on the third prism, and the light source light-in surface and the light valve light-in surface corresponding to the second light valve and the fourth surface enclose the third prism.

The fourth triangular prism also comprises a sixth face and a seventh face, the sixth face is arranged opposite to the third face of the second triangular prism, and the fifth face, the sixth face and the seventh face of the fourth triangular prism enclose the fourth triangular prism.

Optionally, the light valve light incident surface on the first triangular prism receives the output light beam of the first light valve, and the first triangular prism is configured to guide the received light beam to the first surface of the first triangular prism, and emit the light beam to the second surface of the second triangular prism after the light beam exits the first triangular prism through the first surface.

And the second triangular prism is used for guiding the received light beam to the light-emitting surface and emitting the light beam through the light-emitting surface after the second surface of the second triangular prism receives the light beam emitted from the first surface.

Optionally, after the light valve light incident surface on the third triangular prism receives the light beam output by the second light valve, the third triangular prism is configured to guide the received light beam to the fourth surface of the third triangular prism, and emit the light beam to the fifth surface of the fourth triangular prism after the light beam is emitted from the fourth surface of the third triangular prism.

And the second triangular prism is used for guiding the light beam emitted from the third surface to the second surface, reflecting the light beam to the light-emitting surface by the second surface and emitting the light beam through the light-emitting surface.

Optionally, the angle of the incident angle of the light beam output by the first light valve on the light exit surface is equal to the angle of the incident angle of the light beam output by the second light valve on the light exit surface.

Alternatively, as shown in fig. 1, the at least two light valves include a first light valve 131 and a second light valve 132, the prism assembly 12 includes a first tir prism 121 and a second tir prism 122, the light source entrance surface m2 and the light valve entrance surface m4 corresponding to the first light valve 131 are located on the first tir prism 121, and the light source entrance surface m3 and the light valve entrance surface m5 corresponding to the second light valve 132 are located on the second tir prism 122.

Total internal reflection prism (TIR), which is an optical phenomenon that when a light ray passes through two media with different refractive indexes, part of the light ray is refracted at the interface of the media, and the rest is reflected, but when the incident angle is larger than the critical angle (the light ray is far away from the normal), the light ray stops entering the other interface and is totally reflected to the inner surface, and this phenomenon only occurs when the light ray enters an optically thinner medium (a medium with a lower refractive index) from an optically denser medium (a medium with a higher refractive index), and when the incident angle is larger than the critical angle, the light ray is reflected because the light ray is not refracted (the refracted light ray disappears), so the phenomenon is called Total internal reflection. A tir prism is used to alter the ray path in a projection system.

Alternatively, as shown in fig. 1, the first total internal reflection prism 121 includes a first triangular prism 1211 and a second triangular prism 1212, and a first face m6 of the first triangular prism 1211 is disposed opposite to a second face m7 of the second triangular prism 1212. A certain gap may be provided between the first triangular prism 1211 and the second triangular prism 1212, that is, a certain gap may be provided between the first plane m6 and the second plane m 7. The gap may be an air gap.

The light source light incident surface m2 and the light valve light incident surface m4 corresponding to the first light valve 131 are located on the first prism 1211, and the light source light incident surface m2 and the light valve light incident surface m4 corresponding to the first light valve 131 and the first plane m6 enclose the first prism 1211.

The light beam s1 emitted from the first light source assembly 111 enters the first surface m6 of the first prism 1211 through the light source entrance surface m2 of the first prism 1211, is totally reflected on the first surface m6 of the first prism 1211, and is emitted to the first light valve 131 through the light valve entrance surface m4 of the first prism 1211.

The second triangular prism 1212 further includes a third face m8, the light emitting face m1 is located on the second triangular prism 1212, and the second face m7, the light emitting face m1 and the third face m8 of the second triangular prism 1212 enclose the second triangular prism 1212.

Alternatively, as shown in fig. 1, the second total internal reflection prism 122 includes a third triangular prism 1221 and a fourth triangular prism 1222, and a fourth face m9 of the third triangular prism 1221 is disposed opposite to a fifth face m10 of the fourth triangular prism 1222. There is a certain gap between the third triangular prism 1221 and the fourth triangular prism 1222, i.e., there may be a certain gap between the fourth face m9 and the fifth face m 10.

The light source incident surface m3 and the light valve incident surface m5 corresponding to the second light valve 132 are located on the third prism 1221, and the light source incident surface m3, the light valve incident surface m5 and the fourth surface m9 corresponding to the second light valve 132 enclose the third prism 1221.

The light beam s2 emitted from the second light source assembly 112 enters the fourth surface m9 of the third prism 1221 through the light source entrance surface m3 of the third prism 1221, is totally reflected on the fourth surface m9 of the third prism 1221, and is emitted to the second light valve 132 through the light valve entrance surface m5 of the third prism 1221.

The fourth triangular prism 1222 further includes a sixth face m11 and a seventh face m12, the sixth face m11 is disposed opposite to the third face m8 of the second triangular prism 1212, and the fifth face m10, the sixth face m11 and the seventh face m12 of the fourth triangular prism enclose the fourth triangular prism 1222.

There is a certain gap between the first tir prism 121 and the second tir prism 122, i.e. a certain gap between the third facet m8 and the sixth facet m 11.

Alternatively, as shown in fig. 1, after the light valve incident surface m4 on the first triangular prism 1211 receives the output light beam of the first light valve 131, the first triangular prism 1211 is configured to guide the received light beam to the first surface m6 of the first triangular prism 1211, and emit the light beam out of the first triangular prism 1211 through the first surface m6 to the second surface m7 of the second triangular prism 1212.

When the second surface m7 of the second triangular prism 1212 receives the light beam emitted from the first surface m6, the second triangular prism 1212 guides the received light beam to the light emitting surface m1 and emits the light beam through the light emitting surface m 1.

Alternatively, as shown in fig. 1, after the light valve incident surface m5 on the third triangular prism 1221 receives the output light beam of the second light valve 132, the third triangular prism 1221 is configured to guide the received light beam to the fourth surface m9 of the third triangular prism 1221, and after the light beam exits the third triangular prism 1221 through the fourth surface m9, the light beam is directed to the fifth surface m10 of the fourth triangular prism 1222.

The fifth surface m10 of the fourth prism 1222 receives the light beam emitted from the fourth surface m9, the fourth prism 1222 guides the received light beam to the sixth surface m11, and emits the received light beam to the third surface m8 of the second prism 1212 through the sixth surface m11, and the second prism 1212 guides the light beam emitted from the third surface m8 to the second surface m7, and reflects the light beam to the light emitting surface m1 through the second surface m7, and emits the light beam through the light emitting surface m 1.

Alternatively, as shown in fig. 1, the first interval h1 of the first light valve 131 is equal to the second interval h2 of the second light valve 132, the first interval h1 is an interval between the first light valve 131 and the light valve incident surface m4 of the first prism 1211, and the second interval h2 is an interval between the second light valve 132 and the light valve incident surface m5 of the third prism 1221. Because the light beams emitted by the light valve have the same size and the first distance and the second distance are the same, the sizes of the two light beams entering the light inlet surface of the light valve can be the same.

Alternatively, as shown in fig. 2, fig. 2 is a partial structural schematic diagram of the optical engine shown in fig. 1. The lens assembly 14 includes a light incident lens 141 for receiving the light beam emitted from the light emitting surface m1, and the light emitting surface m1 is perpendicular to the main optical axis c1 of the light incident lens 141.

The light emitting surface m1 is perpendicular to the main optical axis c1 of the light incident lens 141, so that the traveling paths of the multiple light beams emitted from the light emitting surface m1 between the light emitting surface m1 and the light incident lens 141 are equal. The traveling path can be the geometrical distance of the light beam between the light-emitting surface and the light-entering lens, the geometrical distance is the same, and further the divergence conditions of the light beam are the same; the multiple beams of light emitted from the light emitting surface have the same traveling path between the light emitting surface and the light incident lens, that is, the divergence conditions of the multiple beams of light are the same, and the sizes of the multiple beams of light emitted into the light incident lens are the same.

Alternatively, as shown in fig. 2, the incident angle m1 of the light beam output by the first light valve 131 on the light exit surface is equal to the incident angle m1 of the light beam output by the second light valve 132 on the light exit surface. That is, the light beams projected onto the light-emitting surface m1 are parallel light beams, so that the light beams can be incident on the light-incident lens of the lens assembly in the same size, thereby improving the projection quality.

The light beam emitted from the first light valve 131 travels in the first triangular prism 1211 with a length of L1, travels in the gap between the first triangular prism 1211 and the second triangular prism 1212 with a length of L2, and travels in the second triangular prism 1212 with a length of L3.

Illustratively, the length of the path traveled by the light beam emitted from the first light valve 131 in the first triangular prism 1211 is L1, and L1 is the geometric distance of the light beam emitted from the first light valve 131 in the first triangular prism 1211, that is, the distance between the point a and the point b.

The light beam emitted from the second light valve travels in the third triangular prism 1221 by a length of L4, travels in the gap between the third triangular prism 1221 and the fourth triangular prism 1222 by a length of L5, travels in the fourth triangular prism 1222 by a length of L6, travels in the gap between the first total internal reflection prism 121 and the second total internal reflection prism 122 by a length of L7, and travels in the second triangular prism 1212 by a length of L8 and L9.

That is, the length of the traveling path of the light beam output by the first light valve 131 between the corresponding light valve light incident surface m4 and light emitting surface m1 is L1+ L2+ L3, and the length of the traveling path of the light beam output by the second light valve 132 between the corresponding light valve light incident surface m5 and light emitting surface m1 is L4+ L5+ L6+ L7+ L8+ L9.

L1+ L2+ L3 is L4+ L5+ L6+ L7+ L8+ L9, so that the divergence between the light beam output by the first light valve 131 and the light beam output by the second light valve 132 corresponding to the light valve incident surface m4 and the light exit surface m1 is the same, that is, the light beam output by the first light valve 131 and the light beam output by the second light valve 132 have the same size on the light exit surface m 1.

In the present embodiment, the lengths L2, L5, and L7 of the paths traveled by the light beam in the gap between the first triangular prism 1211 and the second triangular prism 1212, the gap between the third triangular prism 1221 and the fourth triangular prism 1222, and the gap between the first total internal reflection prism 121 and the second total internal reflection prism 122 are processed in two ways.

The first approach is to ignore the gaps between the prisms, and because the gaps between the prisms are small, the influence on the divergence degree of the light beam is small, and thus the gaps can be ignored.

The second approach is to make L2 equal to L5+ L7, i.e. the distance traveled by the light beam in the prism gap is equal, and the gap between the prisms has the same effect on the divergence of the light beam.

Alternatively, as shown in fig. 3, fig. 3 is a schematic diagram of another optical engine shown in the embodiment of the present application. The prism assembly in the optical engine may refer to the prism assembly provided in the above embodiment, and the light source assembly is configured to provide the light beam s3 with the first wavelength to the light source entrance surface m2 corresponding to the first light valve 131, and the light source 15 is configured to provide the light beam s4 with the second wavelength to the light source entrance surface m3 corresponding to the second light valve 132, where the first wavelength and the second wavelength are not equal. The light beam s3 of the first wavelength may be red light and the light beam s4 of the second wavelength may be blue light and green light.

The light source assembly may include a laser light source 151, a dichroic plate 152, a first lens 153, a second lens 154, a third lens 155, a fourth lens 156, a first reflector 157, and a second reflector 158.

The first lens 153, the second lens 154, the third lens 155, and the fourth lens 156 may be spherical lenses, which are simply referred to as spherical lenses, and the spherical lenses are lenses in which the cross-sectional curves of the curved surfaces of the lenses are circular arcs, that is, optical elements formed by two coaxial refractive curved surfaces, and may be formed by grinding optical glass. The lenses may be classified into a convex lens having a central portion thicker than an edge portion and a concave lens having a central portion thinner than an edge portion. The convex lens can converge the light rays and can be called as a converging lens; a concave lens may act to diverge light rays and may be referred to as a "diverging lens". The single convex lens can form a real image or a virtual image, but the single concave lens can only form a virtual image, and the first lens 153, the second lens 154, the third lens 155, and the fourth lens 156 in the embodiment of the present application may be convex lenses.

The first mirror 157 and the second mirror 158 may be used to change the propagation direction of the light beam, which is advantageous for the compact structure of the optical engine.

Dichroic filters are filters that are almost completely transmissive for certain wavelengths of light and almost completely reflective for other wavelengths of light. The dichroic plate 152 in the embodiment of the present application can transmit red light and reflect blue light and green light, after the light beam emitted by the laser light source 151 passes through the dichroic plate 152, a portion of the blue light and the green light is emitted to the light source incident surface m2 corresponding to the first light valve 131 through the first light source assembly, and a portion of the red light is emitted to the light source incident surface m4 corresponding to the second light valve 132 through the second light source assembly.

In this application, the terms "first," "second," "third," "fourth," "fifth," "sixth," and "seventh" 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 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, comprising a light source assembly, a prism assembly, at least two light valves, and a lens assembly;

2. A light engine as recited in claim 1, wherein at least two prisms of said prism assembly are made of the same material.

3. The optical engine of claim 1, wherein the at least two light valves comprise a first light valve and a second light valve, the prism assembly comprises a first tir prism and a second tir prism, the first light valve corresponding to the light source entrance surface and the light valve entrance surface is located on the first tir prism, and the second light valve corresponding to the light source entrance surface and the light valve entrance surface is located on the second tir prism;

the first total internal reflection prism comprises a first triangular prism and a second triangular prism, and a first surface of the first triangular prism is opposite to a second surface of the second triangular prism;

4. A light engine as recited in claim 3, wherein the second tir prism comprises a third triangular prism and a fourth triangular prism, a fourth face of the third triangular prism being disposed opposite a fifth face of the fourth triangular prism;

the fourth triangular prism further comprises a sixth face and a seventh face, the sixth face is arranged opposite to the third face of the second triangular prism, and the fifth face, the sixth face and the seventh face of the fourth triangular prism are encircled to form the fourth triangular prism;

the light valve light incident surface on the first triangular prism receives the light beam output by the first light valve, and the first triangular prism is used for guiding the received light beam to the first surface of the first triangular prism, and after the light beam is emitted out of the first triangular prism through the first surface, the light beam is emitted to the second surface of the second triangular prism;

5. The optical engine of claim 4, wherein the light valve incident surface of the third triangular prism receives the light beam output by the second light valve, and the third triangular prism is configured to guide the received light beam to the fourth surface of the third triangular prism, and emit the light beam to the fifth surface of the fourth triangular prism after the light beam is emitted from the fourth surface of the third triangular prism;

6. The optical engine of claim 4, wherein a first pitch of the first light valves is equal to a second pitch of the second light valves, the first pitch being a pitch between the first light valves and a light valve entrance face of the first triangular prism, the second pitch being a pitch between the second light valves and a light valve entrance face of the third triangular prism.

7. The optical engine of claim 1, wherein the light valve comprises a digital micromirror device.

8. The optical engine of claim 1, wherein the lens assembly includes an entrance lens for receiving the light beam emitted from the exit surface, and the exit surface is perpendicular to a main optical axis of the entrance lens.

9. The optical engine of claim 8, wherein the angle of the incident angle of the light beam outputted from the first light valve on the light emergent surface is equal to the angle of the incident angle of the light beam outputted from the second light valve on the light emergent surface.

10. The optical engine of claim 2, wherein the light source module is configured to provide a first wavelength light beam to a light incident surface of the light source corresponding to the first light valve, and the light source module is configured to provide a second wavelength light beam to a light incident surface of the light source corresponding to the second light valve, and the first wavelength and the second wavelength are not equal.