阅读说明：本技术 一种光源合束模组、投影显示装置及投影显示设备 (Light source beam combining module, projection display device and projection display equipment ) 是由 宋海涛 其他发明人请求不公开姓名 于 2019-04-09 设计创作，主要内容包括：本发明公开了一种光源合束模组、投影显示装置及投影显示设备,所述光源合束模组包括N组光源；设置在所述N组光源出射光路上的偏振合束元件；设置在所述偏振合束元件出射光路上的N个波长合束元件；每组光源包括相同色彩通道的两个发光单元,且所述两个发光单元被配置为出射不同偏振态的光；所述偏振合束元件用于对每组光源的两个发光单元出射的光进行合束；所述N个波长合束元件用于将偏振合束元件出射的N束光合并为一束光输出；所述N为大于或等于3的整数。上述方案通过合理设置各个元件的空间位置,能够提高光源合束模组空间利用率,有利于光源合束模组的小型化。(The invention discloses a light source beam combining module, a projection display device and projection display equipment, wherein the light source beam combining module comprises N groups of light sources; the polarization beam combining element is arranged on the emergent light paths of the N groups of light sources; the N wavelength beam combining elements are arranged on the emergent light path of the polarization beam combining element; each group of light sources comprises two light-emitting units with the same color channel, and the two light-emitting units are configured to emit light with different polarization states; the polarization beam combining element is used for combining the light emitted by the two light emitting units of each group of light sources; the N wavelength beam combination elements are used for combining N beams emitted by the polarization beam combination elements into a beam of light to be output; and N is an integer greater than or equal to 3. According to the scheme, the space utilization rate of the light source beam combining module can be improved by reasonably setting the space positions of the elements, and the miniaturization of the light source beam combining module is facilitated.)

1. A light source beam combining module is characterized by comprising:

n groups of light sources; the polarization beam combining element is arranged on the emergent light paths of the N groups of light sources; the N wavelength beam combining elements are arranged on the emergent light path of the polarization beam combining element;

each group of light sources comprises two light-emitting units with the same color channel, and the two light-emitting units are configured to emit light with different polarization states;

the polarization beam combining element is used for combining the light emitted by the two light emitting units of each group of light sources;

the N wavelength beam combination elements are used for combining N beams emitted by the polarization beam combination elements into a beam of light to be output; and N is an integer greater than or equal to 3.

2. The light source beam combining module of claim 1, wherein the light source beam combining module comprises a polarization beam combining element, and the N groups of light sources share one polarization beam combining element; or

The light source beam combining module comprises N polarization beam combining elements which are in one-to-one correspondence with the N groups of light sources, and the optical working surfaces of the N polarization beam combining elements are coplanar.

3. The light source beam combining module of claim 2, wherein the two light emitting units of each group of light sources are respectively located at two sides of the polarization beam combining device; the light emitted by one light-emitting unit in each group of light sources directly enters the polarization beam combining element in a first direction, the light emitted by the other light-emitting unit directly enters the polarization beam combining element in a second direction, and the first direction and the second direction are intersected; or

The two light-emitting units of each group of light sources are positioned on the same side of the polarization beam combiner; the light source beam combining module further comprises a reflector; the light emitted by one light emitting unit in each group of light sources directly enters the polarization beam combining element in a first direction, the light emitted by the other light emitting unit enters the polarization beam combining element in a second direction after being reflected by the reflector, and the first direction is intersected with the second direction.

4. The light source beam combining module of claim 3, wherein the N wavelength beam combining elements are disposed in a common optical path, and each wavelength beam combining element is configured to reflect light emitted from its corresponding light source and transmit light emitted from other wavelength beam combining elements.

5. The light source beam combining module according to any one of claims 1 to 4, further comprising N optical fibers, N light in-coupling elements, and N light out-coupling elements corresponding to the N groups of light sources one to one, wherein after the light emitted from each light source is combined by the polarization beam combining elements, the light is coupled into the corresponding optical fiber through the corresponding light in-coupling element, and is coupled out to the corresponding wavelength beam combining element through the corresponding light out-coupling element.

6. The light source beam combining module according to any one of claims 1 to 4, wherein the N groups of light sources include at least a red light source, a green light source and a blue light source, and the number of the red light source/green light source/blue light source can be one or more groups.

7. The light source beam combining module of any one of claims 1-4, wherein the N sets of light sources comprise a red light source, a green light source, a blue light source, and a fourth set of light sources, the fourth set of light sources having different color channels than the red light source, the green light source, and the blue light source.

8. The light source beam combining module according to any one of claims 1-7, wherein the number of the light source beam combining modules is M, and the light source beam combining module further comprises (M-1) reflector sets; the reflector group is positioned between the two groups of light source beam combining modules, the (M-1) reflector groups are used for combining the light emitted by the M groups of light source beam combining modules into a beam of light to be output, and M is an integer greater than or equal to 2.

9. A projection display device, comprising the light source beam combining module and the light scanning module according to any one of claims 1 to 8, wherein light emitted from the light source beam combining module is scanned and output by the light scanning module to be used as display image light.

10. The projection display device of claim 9, wherein the optical scanning module is a fiber scanning module or a MEMS scanning module.

11. A projection display device comprising the projection display apparatus according to claim 9 or 10.

Technical Field

The invention relates to the field of projection display, in particular to a light source beam combining module, a projection display device and projection display equipment.

Background

The imaging principle of the scanning projection technology is that light corresponding to each pixel point of an image to be displayed is modulated through a light source, then, the scanner drives a scanning optical fiber or scans the light corresponding to each pixel point through the movement of a scanning mirror of an MEMS (micro electro mechanical systems, Chinese name: micro electro mechanical system), so that the light corresponding to each pixel point of the image to be displayed is projected on a projection screen one by one to form a projection picture.

The light source has a small light spot size due to the resolution required for scanning the image, and for the optical fiber scanning system, if the light source has a large light spot size, it is difficult to efficiently couple the light emitted from the light source into the optical fiber. Therefore, taking the light source as an example of a laser light source, since combining directly by using a high-power laser makes the size of the light-emitting spot too large, in order to reduce the light-emitting spot of the light source, the laser light source may use a plurality of low-power lasers to combine, so as to generate a light beam output with high power and small spot, instead of directly using the high-power laser to combine.

As shown in fig. 1, it is a light source of a scanning system in the prior art (black arrows in the figure represent light path directions). The light source has adopted 6 lasers to close and has restrainted the light-emitting, and the light source closes and restraints the module and includes: the polarization light source comprises an s-polarization red laser R, P, a polarization red laser R ', an s-polarization green laser G, P, a polarization green laser G ', an s-polarization blue laser B, P, a polarization blue laser B ', 6 collimating lenses, 3 polarization beam combination elements P1, P2 and P3, and 3 wavelength beam combination elements L1, L2 and L3. And a collimating lens is correspondingly arranged at the light outlet of each laser to collimate the divergent light generated by the laser.

Collimated light beams of the s-polarized red laser R and the P-polarized red laser R' are combined by a polarization beam combining element P1; collimated light beams of the s-polarized green laser G, P and the polarized green laser G' are combined by a polarization beam combining element P2; the collimated beams of s-polarized blue laser B, P and polarized blue laser B' are combined by polarization combining element P3. The RGB three-color light beams are finally combined by wavelength combining elements L1, L2, and L3. The combined light beam is converged into the optical fiber by the converging lens to be continuously transmitted, or is converged by the converging lens and then is emitted to the MEMS scanning mirror.

However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that at least the following technical problems exist in the prior art:

Disclosure of Invention

The invention aims to provide a light source beam combining module, a projection display device and projection display equipment, which are used for solving the technical problems that in the prior art, the number of lasers and the number of beam combining devices are large, the structure is complex, and the miniaturization of a light source is difficult to realize.

In order to achieve the above object, a first aspect of an embodiment of the present invention provides a light source beam combining module, including:

n groups of light sources; the polarization beam combining element is arranged on the emergent light paths of the N groups of light sources; the N wavelength beam combining elements are arranged on the emergent light path of the polarization beam combining element;

each group of light sources comprises two light-emitting units with the same color channel, and the two light-emitting units are configured to emit light with different polarization states;

the polarization beam combining element is used for combining the light emitted by the two light emitting units of each group of light sources;

the N wavelength beam combination elements are used for combining N beams emitted by the polarization beam combination elements into a beam of light to be output; and N is an integer greater than or equal to 3.

Optionally, the light source combining module includes a polarization combining element, and the N groups of light sources share one polarization combining element; or

The light source beam combining module comprises N polarization beam combining elements which are in one-to-one correspondence with the N groups of light sources, and the optical working surfaces of the N polarization beam combining elements are coplanar.

Optionally, the two light emitting units of each group of light sources are respectively located at two sides of the polarization beam combiner; the light emitted by one light-emitting unit in each group of light sources directly enters the polarization beam combining element in a first direction, the light emitted by the other light-emitting unit directly enters the polarization beam combining element in a second direction, and the first direction and the second direction are intersected; or

The two light-emitting units of each group of light sources are positioned on the same side of the polarization beam combiner; the light source beam combining module further comprises a reflector; the light emitted by one light emitting unit in each group of light sources directly enters the polarization beam combining element in a first direction, the light emitted by the other light emitting unit enters the polarization beam combining element in a second direction after being reflected by the reflector, and the first direction is intersected with the second direction.

Optionally, the N wavelength beam combining elements are arranged in a common optical path, and each wavelength beam combining element is configured to reflect light emitted from a corresponding light source and transmit light emitted from other wavelength beam combining elements.

Optionally, the light source beam combining module further includes N optical fibers, N optical incoupling elements, and N optical outcoupling elements, which are in one-to-one correspondence with the N groups of light sources, and light emitted from each light source is coupled into a corresponding optical fiber through the corresponding optical incoupling element after being combined by the polarization beam combining element, and is coupled out to a corresponding wavelength beam combining element through the corresponding optical outcoupling element.

Optionally, the N groups of light sources at least include a red light source, a green light source, and a blue light source, and the number of the red light source/green light source/blue light source may be one or more groups.

Optionally, the N groups of light sources include a red light source, a green light source, a blue light source, and a fourth group of light sources, and color channels of the fourth group of light sources are different from those of the red light source, the green light source, and the blue light source.

Optionally, the number of the light source beam combining modules is M, and the light source beam combining module further includes (M-1) reflector groups; the reflector group is positioned between the two groups of light source beam combining modules, the (M-1) reflector groups are used for combining the light emitted by the M groups of light source beam combining modules into a beam of light to be output, and M is an integer greater than or equal to 2.

A second aspect of an embodiment of the present invention provides a projection display device, including the light source beam combining module and the light scanning module described in the first aspect, where light emitted by the light source beam combining module is scanned and output by the light scanning module and then is used as display image light.

Optionally, the optical scanning module is an optical fiber scanning module or an MEMS scanning module.

A third aspect of embodiments of the present invention provides a projection display apparatus including the projection display device according to the second aspect.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

in the scheme of the embodiment of the invention, the light source beam combining module comprises N groups of light sources, a polarization beam combining element and N wavelength beam combining elements, each group of light sources comprises two light emitting units with the same color channel, the two light emitting units of each group of light sources are combined by the polarization beam combining element, and then the N light beams emitted by the polarization beam combining element are combined into one light beam by the N wavelength beam combining elements to be output, so that when the number of elements included in the light source beam combining module is large, the space utilization rate of the light source beam combining module can be improved by reasonably setting the space position of each element, and the miniaturization of the light source beam combining module is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:

FIG. 1 is a schematic diagram of a light source in the prior art;

fig. 2A is a schematic structural diagram of a light source beam combining module according to an embodiment of the present invention;

FIG. 2B is a schematic diagram of the optical path corresponding to the light source combining module in FIG. 2A;

fig. 2C is a schematic structural diagram of a possible light source beam combining module according to an embodiment of the present invention;

FIG. 2D is a schematic diagram of the optical path corresponding to the light source combining module in FIG. 2C;

FIG. 2E is a top view of the light source beam combining module in FIG. 2A;

FIG. 2F is a front view of the light source combining module of FIG. 2A;

fig. 3A is a schematic structural diagram of another possible light source beam combining module according to an embodiment of the present invention;

FIG. 3B is a schematic diagram of the optical path corresponding to the light source combining module in FIG. 3A;

FIG. 3C is a top view of the light source beam combining module shown in FIG. 3A;

FIG. 3D is a front view of the light source combining module of FIG. 3A;

FIG. 3E is a schematic diagram of a possible mirror according to an embodiment of the present invention;

fig. 4A and 4B are schematic diagrams of a light source beam combining module provided by an embodiment of the present invention including 4 sets of light sources;

FIGS. 4C-4E are schematic diagrams illustrating the reflection efficiency of a wavelength combining element according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a light source beam combining module including optical fibers according to an embodiment of the present invention;

fig. 6A and 6B are schematic diagrams illustrating optical path folding of the multi-light source beam combining module.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.

In the embodiment of the invention, the light source beam combining module comprises N groups of light sources; the polarization beam combining element is arranged on the emergent light paths of the N groups of light sources; the N wavelength beam combining elements are arranged on the emergent light path of the polarization beam combining element; each group of light sources comprises two light-emitting units with the same color channel, and the two light-emitting units are configured to emit light with different polarization states; the polarization beam combining element is used for combining the light emitted by the two light emitting units of each group of light sources; the N wavelength beam combination elements are used for combining N beams emitted by the polarization beam combination elements into a beam of light to be output; and N is an integer greater than or equal to 3.

In the above embodiment, when the number of the elements included in the light source combining module is large, due to the reasonable arrangement of the spatial positions of the elements, that is, the two light emitting units of each group of light sources are combined by the polarization combining element, the space utilization rate of the light source combining module can be improved, and the miniaturization of the light source combining module is facilitated.

In the embodiment of the present invention, the value of N is an integer greater than or equal to 3, and the value of N may be 3, 4, 5, 6, or the like. In a possible embodiment, in order to increase the light source energy, the N groups of light sources at least include a red light source, a green light source and a blue light source, and the number of the red light source, the green light source or the blue light source in the N groups of light sources can be one or more groups; for example: the light source beam combining module comprises 4 groups of light sources, two groups of red light sources, one group of green light sources and one group of blue light sources; another example is: the light source beam combining module comprises 6 groups of light sources, namely two groups of red light sources, two groups of green light sources and two groups of blue light sources. In the embodiment of the present invention, in order to improve the display effect, the light source combining module may further include one or more groups of fourth light sources besides the red light source, the green light source and the blue light source, and the fourth light source may be a yellow light source, an orange light source, and the like, which is not limited in this respect.

Referring to fig. 2A-2F, assuming that N has a value of 3, the light source combining module includes 3 sets of light sources. The 3 groups of light sources are a red light source 101, a green light source 102, and a blue light source 103, respectively, each group of light sources includes two light emitting units with the same color channel, and the light emitting units are configured to emit light with different polarization states, and the wavelengths of the light emitted by the two light emitting units may be the same or different. Wherein, the red light source 101 includes s-polarized red laser R and p-polarized red laser R ', the green light source 102 includes s-polarized green laser G and p-polarized green laser G ', and the blue light source 103 includes s-polarized blue laser B and p-polarized blue laser B '. Taking a laser as an example of a laser tube, the polarization states of light emitted by the laser are opposite, and the polarization states of the laser can be changed relatively by rotating the laser tube. Further, in the embodiment of the present invention, each laser may be provided with a corresponding collimating lens.

In one possible implementation, as shown in fig. 2A and 2B, the polarization beam combining element 201 includes a polarization beam combining element P1 corresponding to the red light source 101, a polarization beam combining element P2 corresponding to the green light source 102, and a polarization beam combining element P3 corresponding to the blue light source 103, the optical working planes of P1, P2, and P3 are coplanar, P1 combines the red lasers R and R ' into one optical output, P2 combines the green lasers G and G ' into one optical output, and P3 combines the blue lasers B and B ' into one optical output.

In another possible embodiment, as shown in fig. 2C and fig. 2D, the light source combining module includes a polarization combining element 201, and the N groups of light sources share one polarization combining element 201, that is, the polarization combining element 201 simultaneously satisfies the polarization combining of the red light source 101, the green light source 102, and the blue light source 103, and combines the red lasers R and R ' into one light output, combines the green lasers G and G ' into one light output, and combines the blue lasers B and B ' into one light output through the polarization combining element 201.

In the embodiment of the present invention, the polarization beam combining element 201 may be a PBS (polarization beam splitter, chinese name: polarization beam splitter), an optical working surface of the polarization beam combining element 201 is a polarization selection surface in the PBS, and the polarization beam combining element 201 may transmit one polarized light and reflect another polarized light, so as to realize the beam combination of lights with different polarization states, for example: the polarization beam combiner 201 can transmit p-polarized light and reflect s-polarized light; alternatively, the polarization beam combiner 201 may transmit s-polarized light and reflect p-polarized light.

The light source beam combining module further comprises 3 wavelength beam combining elements, which are arranged on an emergent light path of the polarization beam combining element 201, and the 3 wavelength beam combining elements are a first wavelength beam combining element 301 corresponding to the red light source 101, a second wavelength beam combining element 302 corresponding to the green light source 102 and a third wavelength beam combining element 303 corresponding to the blue light source 103 respectively; the polarization beam combination element 201 emits the combined light of the red light source 101 to the first wavelength beam combination element 301, emits the combined light of the green light source 102 to the second wavelength beam combination element 302, emits the combined light output by the blue light source 103 to the third wavelength beam combination element 303, the first wavelength beam combination element 301 reflects the combined light of the red light source 101 to the second wavelength beam combination element 302, the second wavelength beam combination element 302 transmits the combined light of the red light source 101 and reflects the combined light of the green light source 102, the third wavelength beam combination element 303 transmits the combined light of the red light source 101 and the combined light of the green light source 102 and reflects the combined light of the blue light source 103, and thus combines the three light emitted by the red light source 101, the green light source 102 and the blue light source 103 into a single light to be output.

In the embodiment of the present invention, as shown in fig. 2A and 2B, two light emitting units in each group of light sources may be disposed on two sides of the polarization beam combining element 201, that is, a laser R, a laser G, and a laser B are disposed on one side of the polarization beam combining element 201, a laser R ', a laser G', and a laser B 'are disposed on the other side of the polarization beam combining element 201, light of the laser R, the laser B, and the laser G is emitted in a first direction and directly enters the polarization beam combining element 201 in the first direction, light of the laser R', the laser G ', and the laser B' is emitted in a second direction and directly enters the polarization beam combining element 201 in the second direction, a straight line where the first direction is located intersects a straight line where the second direction is located, an intersection point of the two straight lines is located on an optical working plane of the polarization beam combining element 201, and 3 polarization beam combining elements 201 are disposed in parallel, the direction of the final emergent light of the light source beam combining module can be perpendicular to the plane where the two straight lines are located by adjusting the positions of the 3 wavelength beam combining elements, wherein the first direction is a positive x direction, the second direction is a negative z direction, the direction of the final emergent light of the light source beam combining module is along the negative y direction, and compared with the fact that all light paths in the prior art are in a two-dimensional plane, the light source beam combining module in the embodiment of the invention has higher space utilization rate.

In another possible embodiment, in order to enable all the lasers to be arranged more closely, facilitate the arrangement of the laser connection circuit, and avoid the influence of the circuit line on the modulation of the lasers, all the lasers may be arranged in a matrix on a plane, as shown in fig. 3A-3D, two light emitting units of each group of light sources are located on the same side of the polarization beam combining device 201, that is, the laser R, the laser G, the laser B, the laser R ', the laser G ', and the laser B ' are all arranged on the same side of the polarization beam combining device 201, and the light source beam combining module further includes a reflector 401; the light emitted by one light emitting unit in each group of light sources directly enters the polarization beam combining element 201 in a first direction, and the light emitted by the other light emitting unit enters the polarization beam combining element 201 in a second direction after being reflected by the reflector, so that different lasers of each group of light sources can be combined by the polarization beam combining element 201, and the arrangement of a circuit connected with the lasers is facilitated.

In the embodiment of the present invention, the reflector 401 may be three reflectors arranged side by side, or may be a whole reflector, as shown in fig. 3A, the reflector 401 is a whole reflector; as shown in fig. 3E, the mirror 401 includes three mirrors arranged side by side.

In an embodiment of the present invention, as shown in fig. 3A, the mirror 401 may be parallel to the optical working surface of the polarization beam combining element 201.

In an embodiment of the present invention, in order to increase the light source energy, the number of the red light sources, the green light sources, or the blue light sources in the N groups of light sources may be one or more groups, please refer to fig. 4A and 4B, the light source combining module includes 4 groups of light sources, which are respectively a first group of red light sources 501, a second group of red light sources 502, a group of green light sources 503, and a group of blue light sources 504, the first group of red light sources 501 includes a laser R1 and a laser R1 ', and the second group of red light sources 502 includes a laser R2 and a laser R2'. Correspondingly, the light source beam combining module includes 4 polarization beam combining elements 601 and 4 wavelength beam combining elements, in this embodiment of the present invention, the 4 polarization beam combining elements 601 may be an entire polarization beam combining element, or the 4 polarization beam combining elements 601 are 4 independent polarization beam combining elements with coplanar optical working surfaces, and the 4 wavelength beam combining elements 701, 702, 703, and 704 are respectively in one-to-one correspondence with the 4 groups of light sources.

In the embodiment of the present invention, the wavelengths of the light emitted by the two light emitting units in each group of light sources may be the same or different, and the wavelengths of the light emitted by the light sources with the same color channel may also be the same or different, which is not limited in the present invention.

For example, along the example of the light source combining module including 4 sets of light sources, two sets of red light sources, one set of green light source and one set of blue light source, the first set of red light sources 501 includes s-polarized red laser R1 and p-polarized red laser R1 'of a first wavelength (e.g., 650nm), the second set of red light sources 502 includes s-polarized red laser R2 and p-polarized red laser R2' of a second wavelength (e.g., 635nm), the green light source 503 includes s-polarized green laser G and p-polarized green laser G 'of a third wavelength (e.g., 530nm), and the blue light source 504 includes s-polarized blue laser B and p-polarized blue laser B' of a fourth wavelength (e.g., 460 nm).

In the embodiment of the present invention, in order to combine the light output by N groups of light sources, the N wavelength combining elements are arranged in a common optical path, and each wavelength combining element is configured to reflect the light emitted by its corresponding light source and transmit the light emitted by other wavelength combining elements.

As shown in fig. 4A and 4B, the wavelength of the first group of red light sources 501 is 650nm, the wavelength of the second group of red light sources 502 is 635nm, the wavelength of the green light source 503 is 530nm, and the wavelength of the blue light source 504 is 460nm, wherein the first wavelength beam combining element 701 may be a common reflector or any dichroic filter capable of reflecting red light with a wavelength of 650 nm; the second wavelength beam combining element 702 is a long-wave pass filter, as shown in fig. 4C, and is a schematic diagram of the reflection efficiency of the second wavelength beam combining element 702, and the cut-off wavelength thereof can be set at any position between 635nm and 650nm, so as to transmit the red light with the wavelength of 650nm and reflect the red light with the wavelength of 635 nm; the third wavelength beam combining element 703 is a long-wavelength pass filter, and its reflection efficiency is schematically shown in fig. 4D, and its cut-off wavelength can be set at any position between 530nm and 635nm, so as to transmit the red light with wavelength of 650nm and 635nm and reflect the green light with wavelength of 530 nm; the fourth wavelength beam combining element 704 is a long-wavelength pass filter, as shown in fig. 4E, which is a schematic diagram of the reflection efficiency of the fourth wavelength beam combining element 704, and the cut-off wavelength thereof can be set at any position between 460nm and 530nm, so as to transmit the red light with the wavelength of 650nm, the red light with the wavelength of 635nm and the green light with the wavelength of 530nm, and reflect the blue light with the wavelength of 460nm, thereby combining the red light with the wavelength of 650nm, the red light with the wavelength of 635nm, the green light with the wavelength of 530nm and the blue light with the wavelength of 460nm into one light and outputting the light.

In the embodiment of the present invention, in order to separate a polarization beam combining part (at least including a laser and a polarization beam combining element) and a wavelength beam combining part (including a wavelength beam combining element) of a light source beam combining module at positions, so that the arrangement of the whole light source beam combining module is more flexible, on the basis of the embodiments corresponding to fig. 2A to 4E, the light source beam combining module further includes N optical fibers for transmitting light between the polarization beam combining element and the wavelength beam combining element, the light source beam combining module further includes N optical fibers, N optical coupling-in elements, and N optical coupling-out elements, which are in one-to-one correspondence with N groups of light sources, and after light emitted from each light source is combined by the polarization beam combining element, the light is coupled into the corresponding optical fiber by the corresponding optical coupling-in element, and is coupled out to the corresponding wavelength beam combining element by the corresponding optical coupling-out element.

In the embodiment of the present invention, taking the light source beam combining module in fig. 3A as an example, the light source beam combining module after adding the optical fiber is shown in fig. 5, where the light source beam combining module includes a red light source 101, a green light source 102, and a blue light source 103, six lasers are all disposed on the same side of the polarization beam combining element 201, light emitted from the laser R, the laser G, and the laser B directly enters the polarization beam combining element 201, and light emitted from the laser R ', the laser G ', and the laser B ' enters the polarization beam combining element 201 after being reflected by the reflector 401. Then, light emitted from the red light source 101 is coupled into the optical fiber 901 through the light incoupling element, and is coupled out and emitted to the first wavelength beam combining element 301 through the light outcoupling element, similarly, light emitted from the green light source 102 is coupled into the optical fiber 902 through the light incoupling element, and is coupled out and emitted to the second wavelength beam combining element 302 through the light outcoupling element, and light emitted from the blue light source 103 is coupled into the optical fiber 903 through the light incoupling element, and is coupled out and emitted to the third wavelength beam combining element 303 through the light outcoupling element.

In the embodiment of the invention, because the optical fiber is added, the polarization beam combining part and the wavelength beam combining part of the light source beam combining module can be randomly arranged, so that the arrangement of the light source beam combining module is more flexible.

In the embodiment of the present invention, when the number of light sources to be combined in the light source combining module is large, if the light sources are arranged in the manner corresponding to the embodiment of fig. 4A, the whole light source combining module is too long, and therefore, the embodiment of the present invention provides a folding type light source combining module, that is, the light source combining module is folded by the mutually perpendicular mirror modules, so that the space utilization rate of the light source combining module can be further improved.

On the basis of the embodiments corresponding to fig. 2A to 5, the number of the light source beam combining modules is M groups, where M is an integer greater than or equal to 2, the light source beam combining module further includes (M-1) reflector groups, the reflector groups are located between two groups of the light source beam combining modules, and the (M-1) reflector groups are used to combine the light emitted by the M groups of the light source beam combining modules into one beam of light to be output.

As shown in fig. 6A and 6B, on the basis of the embodiment shown in fig. 3A, the number of the light source beam combining modules is 2, and the light path of the light source beam combining module 1 is folded by the reflector 3, so that the lights emitted from the light source beam combining module 1 and the light source beam combining module 2 are combined into a beam of light to be output. The mirror group 3 includes a mirror S1 and a mirror S2, and S1 and S2 may be perpendicular to each other.

In the embodiment of the present invention, the arrangement manner of the reflector group 3 is not limited to the mutually perpendicular manner, and other arrangement manners may also be adopted as long as the light emitted by the multiple light source beam combining modules is combined into one light beam to be output, which is not limited in this respect. Further, when the number of the light source beam combining modules is 3, 4 or more, the light paths of the light source beam combining modules can be folded in the above manner, so as to realize beam combining, which is not described herein again.

Based on the same inventive concept, an embodiment of the present invention further provides a projection display apparatus, including any one of the light source beam combining modules and the light scanning module in the embodiments corresponding to fig. 2A to 6B, where light emitted by the light source beam combining module is scanned and output by the light scanning module and then is used as display image light. The optical scanning module is an optical fiber scanning module or an MEMS scanning module, and the invention is not limited thereto.

The projection display device in the embodiment of the invention can be applied to various projection display devices, such as: head-mounted AR (English full name: Augmented Reality) equipment, head-mounted VR English full name: VirtualReality; chinese name: augmented reality) equipment, projection television, projecting apparatus, etc. among these projection display equipment, can use a display module to show, can also show through the mode that a plurality of display modules splice, this does not do the restriction in the invention.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

in the scheme of the embodiment of the invention, the light source beam combining module comprises N groups of light sources, a polarization beam combining element and N wavelength beam combining elements, each group of light sources comprises two light emitting units with the same color channel, the two light emitting units of each group of light sources are combined by the polarization beam combining element, and then the N light beams emitted by the polarization beam combining element are combined into one light beam by the N wavelength beam combining elements to be output, so that when the number of elements included in the light source beam combining module is large, the space utilization rate of the light source beam combining module can be improved by reasonably setting the space position of each element, and the miniaturization of the light source beam combining module is facilitated.

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.