CN216310513U

CN216310513U - Illumination system and projection device

Info

Publication number: CN216310513U
Application number: CN202122888680.3U
Authority: CN
Inventors: 吴昊; 尹蕾
Original assignee: Chengdu Jimi Technology Co Ltd
Current assignee: Chengdu Jimi Technology Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-04-15
Anticipated expiration: 2031-11-23

Abstract

The application discloses an illumination system and a projection device, wherein the illumination system comprises a light source component and a light modulation component, wherein the light source component is used for providing light beams incident to the light modulation component, and laser in the light beams comprises three different wavelengths and two different polarization states; the light modulation assembly comprises a polarization beam splitter, a dichroic element and three LCOS modulators, wherein the polarization beam splitter and the dichroic element are used for guiding light beams provided by the light source assembly to the three LCOS modulators and guiding modulated light obtained by modulation of the three LCOS modulators to emit in the same direction. The laser in the light beam provided by the light source component in the illumination system provided by the embodiment of the application comprises three different wavelengths and two different polarization states, and the light modulation component can simultaneously use the color and the polarization characteristic of light to split and combine light, so that the number of optical elements is reduced, the structure of the illumination system is simple, and the size is small.

Description

Illumination system and projection device

Technical Field

The application relates to the technical field of projection, in particular to an illumination system and a projection device.

Background

The LCOS (liquid crystal on silicon) projection technology is a novel reflective micro-liquid crystal projection technology, which adopts a CMOS integrated circuit chip coated with liquid crystal silicon as a substrate of a reflective LCD, and has the characteristics of high light efficiency, small volume, high aperture ratio, mature manufacturing technology and the like, and can easily realize high resolution and full color expression.

SUMMERY OF THE UTILITY MODEL

In the prior art, a modulation module based on a Liquid Crystal On Silicon (LCOS) modulator generally employs a plurality of Polarizing Beam Splitters (PBS) and a light combining prism (also referred to as an X-prism) to combine, and the modulation module has many parts and complicated structure. The lighting system of traditional three formula LCOS projection ray apparatus adopts a plurality of dichroic mirrors to carry out the beam split to the three chromatic lights of RBG usually, and the rethread polarization beam splitter Prism (PBS) carries out the beam split to incident polarized light and emergent polarized light, then closes through a beam splitter prism to the light after LCOS modulator modulation and restraints, and the optical element who constitutes this kind of mode is more, and the volume is great, and the structure is comparatively complicated, and, the material of common prism is leaded glass or environmental protection glass for. The polarization beam splitter prism made of lead-containing glass is not environment-friendly. The polarization beam splitter prism made of environment-friendly glass has high optical elasticity coefficient and large optical thickness, and the internal stress of the polarization beam splitter prism can cause serious double refraction, so that the projection quality of the LCOS projection light machine is reduced, and the color change and the brightness change of pictures are generated. In view of this, the embodiment of the present application provides an illumination system and a projection apparatus, which have simple structures and small volumes.

In a first aspect, an embodiment of the present application provides an illumination system, including:

the light modulation component is used for modulating light beams emitted by the light source component, wherein the light beams comprise first laser, second laser and third laser, the first laser, the second laser and the third laser are respectively laser with a first wavelength, a second wavelength and a third wavelength, and the first laser has different polarization states compared with the second laser and the third laser;

a light modulation assembly comprising a first LCOS modulator, a second LCOS modulator, a third LCOS modulator, a polarization splitter, and a dichroic element, wherein,

the first LCOS modulator is used for modulating the first laser into first modulated light and reflecting the first modulated light to the polarization beam splitter;

the second LCOS modulator is used for modulating the second laser into second modulated light and reflecting the second modulated light to the dichroic element;

the third LCOS modulator is used for modulating the third laser into third modulated light and reflecting the third modulated light to the dichroic element;

the polarization beam splitter is used for guiding first laser light in the light beams provided by the light source component to the first LCOS modulator, guiding second laser light and third laser light in the light beams provided by the light source component to the dichroic element, and guiding the first modulated light, the second modulated light and the third modulated light to emit in the same direction;

a dichroic element is to direct the second laser light to the second LCOS modulator and the third laser light to the third LCOS modulator, and to direct second and third modulated light to the polarization splitter.

In a possible implementation manner, the polarization beam splitter transmits the first laser light, reflects the second laser light and the third laser light, and reflects the first modulated light, and transmits the second modulated light and the third modulated light, or reflects the first laser light, transmits the second laser light and the third laser light, and transmits the first modulated light, and reflects the second modulated light and the third modulated light;

the dichroic element transmits the second laser light and reflects the third laser light, and transmits the second modulated light and reflects the third modulated light, or reflects the second laser light and transmits the third laser light, and reflects the second modulated light and transmits the third modulated light.

In one possible implementation, the polarization beam splitter is perpendicular to the plane of the surface of the dichroic element.

In one possible implementation, the polarization beam splitter and the dichroic element have their surfaces in a plane parallel to each other.

In one possible implementation, the dichroic element also transmits the first laser light and transmits the first modulated light.

In one possible implementation, the light beam provided by the light source module is incident to the polarization splitting plate at an angle of 45 degrees.

In a second aspect, an embodiment of the present application provides a lighting system, including:

a light modulation assembly comprising a first LCOS modulator, a second LCOS modulator, a third LCOS modulator, a polarization splitter, a first dichroic element, and a second dichroic element, wherein,

the second LCOS modulator is used for modulating the second laser into second modulated light and reflecting the second modulated light to the polarization beam splitter;

the third LCOS modulator is used for modulating the third laser into third modulated light and reflecting the third modulated light to the polarization beam splitter;

the first dichroic element is used for guiding first laser in the light beams provided by the light source assembly to a first light path and enabling the first laser to be incident to the polarization beam splitter, and guiding second laser and third laser in the light beams provided by the light source assembly to a second light path and enabling the second laser and the third laser to be incident to the polarization beam splitter;

the polarization beam splitter is used for guiding the first laser light to the first LCOS modulator, the second laser light to the second LCOS modulator, the third laser light to the third LCOS modulator, and the first, second and third modulated light to the second dichroic element;

the second dichroic element is used for guiding the first modulated light, the second modulated light and the third modulated light to be emitted in the same direction.

In one possible implementation manner, the first dichroic element reflects the first laser light and the second laser light and transmits the third laser light, or transmits the first laser light and the second laser light and reflects the third laser light;

the polarization beam splitter transmits the first laser light, reflects the second laser light and the third laser light, reflects the first modulated light, transmits the second modulated light and the third modulated light, or reflects the first laser light, transmits the second laser light and the third laser light, transmits the first modulated light, and reflects the second modulated light and the third modulated light;

the second dichroic element transmits the first modulated light and the second modulated light and reflects the third modulated light, or reflects the first modulated light and the second modulated light and transmits the third modulated light.

In one possible implementation, the planes of the surfaces of the first dichroic element and the second dichroic element are perpendicular to the plane of the surface of the polarization splitter, and the first dichroic element and the second dichroic element are located on two opposite sides of the polarization splitter.

In one possible implementation, the first dichroic element and the second dichroic element are located in the same plane.

In one possible implementation, the light beam provided by the light source module is incident to the first dichroic element at an angle of 45 degrees.

In one possible implementation manner, the color of the first laser, the color of the second laser, and the color of the third laser are selected from red, green, and blue, and the polarization state of the first laser, the polarization state of the second laser, and the polarization state of the third laser are selected from P-polarization state and S-polarization state.

In a third aspect, an embodiment of the present application provides a projection apparatus, where the projection apparatus includes the illumination system described in the first aspect and possible implementation manners of the first aspect or the second aspect and possible implementation manners of the second aspect.

The laser in the light beam provided by the light source component in the illumination system provided by the embodiment of the application comprises three different wavelengths and two different polarization states, and the light modulation component can simultaneously use the color and polarization characteristics of light to split and combine light, so that optical elements are reduced, and the illumination system is simple in structure and small in size; the whole lighting system can not need a prism, eliminates the influence of internal stress birefringence caused by the prism on the projection quality of the LCOS projection optical machine, solves the problems of color change and brightness change of a projection picture, improves the projection picture quality of the projection optical machine, and further improves the display quality of a projector.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numerals generally refer to like parts. Wherein:

fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a light source module according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of another light source module according to the embodiments of the present disclosure;

FIG. 4 is a schematic view of another light source module according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a light modulation assembly according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another light modulation assembly according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a structure of yet another light modulation assembly provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a further light modulation assembly according to an embodiment of the present disclosure;

100: a light source assembly; 200: a light modulation component; 300: a lens assembly; 400: a projection screen; 11, 12, 13: a laser light source; 21, 22: a light source light path beam combining element; 31: a reflective element; 41: a polarization beam splitter; 51, 52: a dichroic element; 61, 62, 63: an LCOS modulator; 71: a wave plate.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Moreover, while the disclosure herein has been presented in terms of exemplary one or more examples, it is to be understood that each aspect of the disclosure can be utilized independently and separately from other aspects of the disclosure to provide a complete disclosure. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one of a, b, or c, may represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple. In addition, for the convenience of clearly describing the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", and the like are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first", "second", and the like do not limit the quantity and execution order. The descriptions of the first, second, etc. appearing in the embodiments of the present application are only for illustrating and differentiating the objects, and do not represent the order or the particular limitation of the number of the devices in the embodiments of the present application, and do not constitute any limitation to the embodiments of the present application. The terms "upper", "lower", "inner", "outer", "front", "back", and the like are used for convenience in describing the present application and for simplicity in description, and are not intended to imply or imply any limitations on the present application.

In this application, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In order to thoroughly understand the present application, a detailed description will be provided below in order to explain the technical solution of the present application. The following detailed description of the preferred embodiments of the present application, however, will suggest that the present application may have other embodiments in addition to these detailed descriptions.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application. As shown in fig. 1, the projection system may generally include a light source assembly 100, a light modulation assembly 200, a lens assembly 300 and a projection screen 400, wherein the light source assembly 100 provides a light beam incident to the light modulation assembly 200, the light modulation assembly 200 modulates the light beam provided by the light source assembly 100, and the modulated light beam is projected to the projection screen 400 through the lens assembly 300.

In this embodiment of the application, the light beam provided by the light source module 100 includes a first laser, a second laser, and a third laser, where the first laser, the second laser, and the third laser are lasers having a first wavelength, a second wavelength, and a third wavelength, respectively, and the first laser has a different polarization state than the second laser and the third laser. In the following embodiments, the present application will be described by taking as an example that the first laser light, the second laser light, and the third laser light are respectively a red laser light, a green laser light, and a blue laser light, the red laser light is in a P-mode, and the green laser light and the blue laser light are in an S-mode. It should be noted that the colors of the first laser, the second laser, and the third laser may be interchanged, and may also be lasers of other colors, or lasers of the same color but different wavelengths, and meanwhile, the polarization states of the first laser, the second laser, and the third laser may also be interchanged, and are not limited to being selected from the P-vibration state and the S-vibration state, and in addition, the light beam provided by the light source assembly 100 may also include other lights, which is not limited in this application.

Fig. 2-4 are schematic structural diagrams of three light source assemblies provided in the embodiments of the present disclosure. The laser beams emitted by the red laser source 11, the green laser source 12 and the blue laser source 13 are combined by the light source light path

beam combination elements

21 and 22, and the combined three-color laser beams can also enter the light modulation assembly after passing through the elements such as the converging lens, the diffusion sheet, the diffusion wheel and the light homogenizing assembly. Because the three light sources are arranged differently, the light source light path combining light paths may also be different, as in the embodiment shown in fig. 2, the laser light generated by the three light sources can be combined by using the light source light

path combining elements

21 and 22, and as in the embodiment shown in fig. 3, the laser light generated by the three light sources needs to be combined by using the reflecting element 31 and the light source light

path combining elements

21 and 22. The light

source combining elements

21 and 22 may be dichroic elements, for example, the light source combining element 21 is a dichroic mirror that transmits red and reflects green, and the light source combining element 22 is a dichroic mirror that transmits red and green but reflects blue.

In the embodiments shown in fig. 2 and 3, the laser emitted from the red laser source 11 is in a P-polarization state, and the laser emitted from the green laser source 12 and the blue laser source 13 is in an S-polarization state, in some embodiments, the laser emitted from the red laser source 11, the laser emitted from the green laser source 12 and the laser emitted from the blue laser source 13 have the same polarization state, and at this time, the polarization state of the laser may be changed by using a wave plate or the like, as shown in fig. 4, a half wave plate may be disposed in front of the red laser source 11 to convert the red laser emitted from the S-polarization state into the P-polarization state, so that the red laser in the light beam incident to the light modulation assembly 200 has a different polarization state compared with the green laser and the blue laser.

It should be noted that the structure of the light source assembly 100 is not limited to the embodiments shown in fig. 2-4 in the present application, as long as the light beam provided by the light source assembly 100 includes three lasers with different three wavelengths, and one of the lasers has a different polarization state. In addition, the light source 11, the light source 12, and the light source 13 in the light source assembly 100 may emit light simultaneously or according to a predetermined timing.

Fig. 5-8 are schematic structural diagrams of four light modulation assemblies provided in the embodiments of the present application. In the embodiment of the present application, the light modulation assembly 200 includes three LCOS modulators, respectively configured to modulate laser light with three different wavelengths in the light beam provided by the light source assembly 100. The light modulated by the LCOS modulator has the same wavelength as the light before modulation, but the polarization state of the light before and after modulation changes, for example, after the red laser in the P-vibration state is modulated by the LCOS modulator, the red laser in the S-vibration state is obtained, after the green laser in the S-vibration state is modulated by the LCOS modulator, the green laser in the P-vibration state is obtained, and after the blue laser in the S-vibration state is modulated by the LCOS modulator, the blue laser in the P-vibration state is obtained.

As shown in fig. 5, the light modulation assembly 200 includes an LCOS modulator 61, an LCOS modulator 62, an LCOS modulator 63, a polarization splitter 41, and a dichroic element 51. In this embodiment, the polarization splitting sheet 41 is for transmitting P-state polarized light and reflecting S-state polarized light; the dichroic element 51 is used to reflect green light and transmit blue light. The light beam provided by the light source assembly 100 is incident on the polarization beam splitter 41, the red laser in the P-vibration state is transmitted through the polarization beam splitter 41 and is incident on the LCOS modulator 61, is modulated into red modulated light in the S-vibration state by the LCOS modulator 61, is reflected to the polarization beam splitter 41 along an incident light path, and is reflected to the light outlet at the polarization beam splitter 41; the green laser and the blue laser in the S-vibration state are reflected to the dichroic element 51 at the polarization beam splitter 41, the green light is reflected to the LCOS modulator 62 at the dichroic element 51, modulated into green modulated light in the P-vibration state by the LCOS modulator 62, reflected to the dichroic element 51 along an incident light path, reflected to the polarization beam splitter 41 at the dichroic element 51, and transmitted to the light outlet at the polarization beam splitter 41; the blue light is transmitted to the LCOS modulator 63 through the dichroic element 51, modulated into the blue modulated light of the P-polarization state by the LCOS modulator 63, reflected to the dichroic element 51 along the incident light path, transmitted to the polarization beam splitter 41 through the dichroic element 51, and transmitted to the light exit through the polarization beam splitter 41.

With continued reference to fig. 5, the polarization beam splitter 41 and the dichroic element 51 are disposed at an angle, i.e. the plane of the surfaces of the polarization beam splitter 41 and the dichroic element 51 intersect, e.g. the plane of the surfaces of the two are perpendicular to each other, so as to optimize the light path. Alternatively, the polarization splitter 41 and the dichroic element 51 are disposed in a contiguous manner, and further, they may be disposed in an L-shape, but they may be included at an acute angle, a right angle or an obtuse angle, so as to reduce the space required by the light modulation assembly 200, and in other embodiments, they may be disposed separately. In addition, the surface of the element in the embodiments of the present application refers to a light incident surface or a light emitting surface of the element.

In some embodiments, the light beam provided by the light source assembly 100 is incident on the polarization beam splitter 41 at an angle of 45 degrees, and further, the polarization beam splitter 41 is disposed perpendicular to the dichroic element 51. Alternatively, the polarization splitting sheet 41 and the dichroic element 51 may be the same size, thereby facilitating assembly of the elements. Alternatively, the dichroic element 51 may also transmit red light, and in this case, a dotted line portion is added to the dichroic element 51, as shown in fig. 5, the dotted line portion and the solid line portion may be an integral body and have the same characteristics, such as both characteristics of turning green and transmitting blue and red, and the dotted line portion and the solid line portion may also be two separate portions and have different characteristics, such as the solid line portion has the characteristics of turning green and transmitting blue, and the dotted line portion transmits all light, and in this case, the dichroic element 51 and the polarizer may be arranged in a T shape.

Fig. 6 is a schematic structural diagram of another light modulation assembly provided in the embodiment of the present application. As shown in fig. 6, the light modulation assembly 200 includes an LCOS modulator 61, an LCOS modulator 62, an LCOS modulator 63, a polarization splitter 41, and a dichroic element 51. In this embodiment, the dichroic element 51 is also used for reflecting green light and transmitting blue light, and it should be noted that in other embodiments, the dichroic element 51 may also be used for transmitting green light and reflecting blue light. Unlike the embodiment shown in fig. 5, the polarization beam splitter 41 is used to transmit S-polarized light and reflect P-polarized light, that is, after the light beam provided by the light source assembly 100 is incident on the polarization beam splitter 41, there are two colors of laser light transmitted by the polarization beam splitter 41, namely, only one color of laser light reflected by the polarization beam splitter is red.

Specifically, the light beam provided by the light source assembly 100 is incident on the polarization beam splitter 41, the red laser in the P-vibration state is reflected by the polarization beam splitter 41 and incident on the LCOS modulator 61, is modulated into the red modulated light in the S-vibration state by the LCOS modulator 61, is reflected to the polarization beam splitter 41 along the incident light path, and is transmitted to the light outlet at the polarization beam splitter 41; the green laser and the blue laser in the S-vibration state are transmitted to the dichroic element 51 through the polarization beam splitter 41, the green light is reflected to the LCOS modulator 62 through the dichroic element 51, modulated into green modulated light in the P-vibration state through the LCOS modulator 62, reflected to the dichroic element 51 along an incident light path, reflected to the polarization beam splitter 41 through the dichroic element 51, and reflected to the light outlet through the polarization beam splitter 41; the blue light is transmitted to the LCOS modulator 63 through the dichroic element 51, modulated into the blue modulated light of the P-polarization state by the LCOS modulator 63, reflected to the dichroic element 51 along the incident light path, transmitted to the polarization beam splitter 41 through the dichroic element 51, and reflected to the light exit through the polarization beam splitter 41.

The arrangement of the polarization splitter 41 and the dichroic element 51 in the embodiment shown in fig. 6 is the same as that in the embodiment shown in fig. 5, and will not be described again.

Fig. 7 is a schematic structural diagram of another light modulation component according to an embodiment of the present disclosure. As shown in fig. 7, the light modulation assembly 200 includes an LCOS modulator 61, an LCOS modulator 62, an LCOS modulator 63, a polarization splitter 41, and a dichroic element 51. Compared with the embodiment shown in fig. 5, the polarization splitting plate 41 and the dichroic element 51 in this embodiment have the same functions, i.e., the polarization splitting plate 41 is used to transmit P-state polarized light and reflect S-state polarized light, and the dichroic element 51 is used to reflect green light and transmit blue light. Unlike the embodiment shown in fig. 5, the polarization splitter 41 and the dichroic element 51 are arranged in parallel, i.e., the planes of their surfaces are parallel to each other, and the position of the LCOS modulator is adaptively adjusted. The optical path of the embodiment shown in fig. 7 is the same as that of the embodiment shown in fig. 5, and is not described again here.

In the embodiments shown in fig. 5 to 7, only one polarization beam splitter and one dichroic element are needed in the light modulation assembly 200 to guide the three-color laser light provided by the light source assembly 100 to the corresponding LCOS modulators, and guide the modulated light obtained by modulating the three LCOS modulators to the same direction for emission, which greatly reduces the volume of the light modulation assembly.

Fig. 8 is a schematic structural diagram of another light modulation component according to an embodiment of the present disclosure. As shown in fig. 8, the light modulation assembly 200 includes an LCOS modulator 61, an LCOS modulator 62, an LCOS modulator 63, a polarization splitting sheet 41, a dichroic element 51, and a dichroic element 52. In this embodiment, the polarization splitting sheet 41 is for transmitting P-state polarized light and reflecting S-state polarized light; the dichroic element 51 is for reflecting green and red light and transmitting blue light; the dichroic element 52 is for transmitting green and red light and reflecting blue light.

Specifically, the light beam provided by the light source assembly 100 enters the dichroic element 51, the blue laser light is transmitted to the polarization beam splitter 41, and since the blue laser light is S-state polarized light, the blue laser light is reflected to the LCOS modulator 63 at the polarization beam splitter 41, modulated into P-state blue modulated light by the LCOS modulator 63, reflected to the polarization beam splitter 41 along the incident light path, transmitted to the dichroic element 52 at the polarization beam splitter 41, and reflected to the light outlet at the dichroic element 52; the red laser and the green laser are reflected to the polarization beam splitter 41 by the dichroic element 51, and are reflected to the LCOS modulator 62 by the polarization beam splitter 41 because the green laser is S-state polarized light, modulated to be P-state green modulated light by the LCOS modulator 62, reflected to the polarization beam splitter 41 along an incident light path, transmitted to the dichroic element 52 by the polarization beam splitter 41, and transmitted to the light outlet by the dichroic element 52; since the red laser light is P-state polarized light, the red laser light is transmitted to the LCOS modulator 61 through the polarization splitter 41, modulated into S-state red modulated light by the LCOS modulator 61, reflected to the polarization splitter 41 along the incident light path, reflected to the dichroic element 52 through the polarization splitter 41, and transmitted to the light exit port through the dichroic element 52.

It should be noted that, in some other embodiments, the polarization splitter 41 may be configured to transmit S-state polarized light and reflect P-state polarized light; the dichroic element 51 may be used to transmit green and red light and reflect blue light, or to reflect/transmit blue and red light and transmit/reflect green light; the dichroic element 52 may be configured to reflect/transmit green light and red light and transmit/reflect blue light, or to reflect/transmit blue light and red light and transmit/reflect green light, which is not limited in this embodiment of the application, and the polarization states of two types of laser light reflected/transmitted by the dichroic element 51 are different, and the dichroic element 52 may be configured to guide two types of modulated light obtained by modulating the two types of laser light by the LCOS modulator and modulated light obtained by modulating another type of laser light by the LCOS modulator to the same direction to be emitted.

In the embodiment shown in fig. 8, only one polarization beam splitter and two dichroic elements are needed in the light modulation assembly 200 to guide the three-color laser provided by the light source assembly 100 to the corresponding LCOS modulators, and guide the modulated light obtained by modulating the three LCOS modulators to exit in the same direction, which greatly reduces the volume of the light modulation assembly.

With continued reference to fig. 8, the

dichroic elements

51 and 52 are located on opposite sides of the polarization beam splitter 41, and the planes of the surfaces of the

dichroic elements

51 and 52 intersect the plane of the surface of the polarization beam splitter 41. Further, the planes of the surfaces of the dichroic element 51 and the dichroic element 52 are parallel to each other, further, the dichroic element 51 and the dichroic element 52 are located in the same plane, and the included angle between the plane of the dichroic element 51 and the plane of the dichroic element 52 and the plane of the polarization splitting plate 41 can be an acute angle, a right angle or an obtuse angle, further, the dichroic element 51 and the dichroic element 52 and the polarization splitting plate 41 can be spliced and arranged in an X shape, so that the volume of the light modulation assembly can be further reduced, and the assembly of the elements is facilitated.

In some embodiments, the light beams provided by the light source assembly 100 may be incident on the dichroic element 51 at an angle of 45 degrees, and further, the dichroic element 51 and the dichroic element 52 are respectively disposed on both sides of the polarization splitting plate 41 and perpendicular to the polarization splitting plate 41, so as to optimize the light path. Alternatively, the dichroic element 51 and the dichroic element 52 are the same size, and the polarization splitting plate 41 is larger than both the dichroic element 51 and the dichroic element 52; alternatively, the size of the polarization splitting sheet 41 is the sum of the sizes of the dichroic element 51 and the dichroic element 52, thereby facilitating the assembly of the elements.

The embodiment of the present application further provides a projection apparatus, including the illumination system related to the above embodiment, and the projection apparatus further includes other components, such as a projection lens, and the arrangement of these components may refer to related technologies, which are not described herein again.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An illumination system, comprising:

2. An illumination system according to claim 1, wherein the polarization beam splitter transmits the first laser light and reflects the second laser light and the third laser light and reflects the first modulated light and transmits the second modulated light and the third modulated light, or reflects the first laser light and transmits the second laser light and the third laser light and transmits the first modulated light and reflects the second modulated light and the third modulated light;

3. An illumination system according to claim 1, wherein the polarization beam splitter is perpendicular to or parallel to the plane of the surface of the dichroic element.

4. An illumination system according to claim 2, wherein the dichroic element is further transmissive for the first laser light and transmissive for the first modulated light.

5. An illumination system, comprising:

6. An illumination system according to claim 5, wherein the first dichroic element reflects the first laser light and the second laser light and transmits the third laser light, or transmits the first laser light and the second laser light and reflects the third laser light;

7. An illumination system according to claim 5, wherein the first dichroic element and the second dichroic element have surfaces that are both perpendicular to the plane of the surface of the polarization beamsplitter, and wherein the first dichroic element and the second dichroic element are located on opposite sides of the polarization beamsplitter.

8. An illumination system according to claim 7, wherein said first dichroic element and said second dichroic element are located in the same plane.

9. The illumination system as recited in claim 5, wherein the light source module provides a light beam incident on the first dichroic element at an angle of 45 degrees.

10. A projection device, characterized in that the projection device comprises an illumination system as claimed in any one of claims 1 to 9.