CN114609854A

CN114609854A - Projection light source and projection equipment

Info

Publication number: CN114609854A
Application number: CN202210291131.4A
Authority: CN
Inventors: 颜珂
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-06-10

Abstract

The application discloses projection light source and projection equipment belongs to the photoelectric technology field. The projection light source comprises a plurality of lasers and a plurality of light combining lens groups which are in one-to-one correspondence, as well as a convex cylindrical lens, a concave cylindrical lens, a converging lens and a light homogenizing component; the laser emitted by each laser sequentially passes through the corresponding light combination lens group, the convex cylindrical lens, the concave cylindrical lens, the converging lens and the light homogenizing component and then is emitted out; the light combining lens group, the convex cylindrical lens and the concave cylindrical lens are sequentially arranged along a first direction; on the convex cylindrical lens, the orthographic projections of the plurality of light combining lens groups are sequentially arranged along a second direction, and the orthographic projection of each light combining lens group is positioned outside the orthographic projections of other light combining lens groups; the straight generatrix of the convex cylindrical surface in the convex cylindrical lens and the straight generatrix of the concave cylindrical surface in the concave cylindrical lens are both vertical to the second direction; the first direction is perpendicular to the second direction. The method and the device solve the problem that the display effect of the projection picture formed by the laser emitted by the projection light source is poor. The application is used for light emission.

Description

Projection light source and projection equipment

Technical Field

The application relates to the field of photoelectric technology, in particular to a projection light source and projection equipment.

Background

With the development of the electro-optical technology, the projection device is widely used, and the requirements for miniaturization of the projection device and the display effect of the projection picture are higher and higher.

Fig. 1 is a schematic structural diagram of a projection light source provided in the related art. As shown in fig. 1, the projection light source includes a laser 00, a light combining lens group 01, a beam reducing lens group 02, a converging lens 03, and a light homogenizing unit 04. The beam reducing lens group 02 includes a spherical convex lens and a spherical concave lens. The laser beams of different colors emitted from the laser device 00 are emitted to different lenses in the light combining lens group 01, and are further mixed by the light combining lens group 01 and then emitted to the beam shrinking lens group 02 for beam shrinking. The laser light is then condensed to the light unifying means 04 by the condensing lens 03. The dodging component 04 may homogenize the incident laser light and emit the homogenized laser light to a subsequent modulation optical path, so as to modulate the laser light based on the picture to be projected and emit the modulated laser light, thereby displaying the projected picture.

However, the display effect of the projection screen formed based on the laser light emitted from the projection light source in the related art is poor.

Disclosure of Invention

The application provides a projection light source and projection equipment, which can solve the problem of poor display effect of a projection picture. The technical scheme comprises the following steps:

an aspect provides a projection light source, including: the device comprises a plurality of lasers and a plurality of light combination lens groups which are in one-to-one correspondence, as well as a convex cylindrical lens, a concave cylindrical lens, a converging lens and a light homogenizing component;

the laser emitted by each laser sequentially passes through the corresponding light combining lens group, the convex cylindrical lens, the concave cylindrical lens, the converging lens and the light homogenizing component and then is emitted out;

the light combining lens group, the convex cylindrical lens and the concave cylindrical lens are sequentially arranged along a first direction; on the convex cylindrical lens, the orthographic projections of the plurality of light combining lens groups are sequentially arranged along a second direction, and the orthographic projection of each light combining lens group is positioned outside the orthographic projections of other light combining lens groups; the straight generatrix of the convex cylindrical surface in the convex cylindrical lens and the straight generatrix of the concave cylindrical surface in the concave cylindrical lens are both vertical to the second direction; the first direction is perpendicular to the second direction.

In another aspect, a projection apparatus is provided, the projection apparatus comprising: the projection light source, the light valve and the lens;

the projection light source is used for emitting laser to the light valve, the light valve is used for modulating the emitted laser and then emitting the modulated laser to the lens, and the lens is used for projecting the emitted laser to form a projection picture.

The beneficial effect that technical scheme that this application provided brought includes at least:

in this application, the projection light source can include a plurality of lasers, and then the projection light source can send the laser of higher luminance, and the display brightness of the projection picture based on this laser formation is higher, carries out the display effect that can improve the projection picture.

In addition, the orthographic projections of the plurality of light combination lens groups corresponding to the plurality of lasers on the convex cylindrical lens are sequentially arranged along the second direction, so that the length of the whole light spot in the second direction is longer after the laser emitted by the plurality of lasers is emitted from the plurality of light combination lens groups, and the length-width ratio of the light spot is larger. The laser emitted by the plurality of light combining lens groups can be emitted after sequentially passing through the convex cylindrical lens and the concave cylindrical lens, and the straight generatrix of the convex cylindrical surface in the convex cylindrical lens and the straight generatrix of the concave cylindrical surface in the concave cylindrical lens are perpendicular to the second direction. Therefore, only the laser can be converged in the second direction, the length of the laser emitted from the concave cylindrical lens in the second direction can be reduced, and the length-width ratio of a light spot is reduced. And then can be favorable to subsequent receipts light, improve the utilization ratio of laser, can further promote the display effect based on the projection picture that the laser that this projection light source sent formed.

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 a projection light source provided in the related art;

fig. 2 is a schematic structural diagram of a projection light source provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a laser-formed light spot provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a laser provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of another laser provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a projection light source according to another embodiment of the present application.

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.

With the development of the electro-optical technology, the application of the projection device is more and more extensive, the requirement for the display effect of the projection picture projected by the projection device is higher and higher, and the requirement for the miniaturization of the projection device is higher and higher. The projection light source plays a crucial role in the display effect of the projection picture and the miniaturization of the projection equipment. The embodiment of the application provides a projection light source and projection equipment, and the projection light source can emit laser with high brightness, and the emitted laser is more suitable for forming a projection picture with a good display effect.

Fig. 2 is a schematic structural diagram of a projection light source provided in an embodiment of the present application, fig. 3 is a schematic structural diagram of another projection light source provided in an embodiment of the present application, fig. 2 may be a top view of the laser shown in fig. 3, and fig. 3 may be a front view of the laser shown in fig. 2. As shown in fig. 2 and 3, the projection light source 10 may include: the laser device comprises a plurality of lasers 101, a plurality of light combination lens groups 102, a convex cylindrical lens 103, a concave cylindrical lens 104, a converging lens 105 and a light homogenizing component 106. The converging lens 105 may be a spherical convex lens.

The plurality of lasers 101 correspond to the plurality of light combining lens groups 102 one by one, and each light combining lens group 102 is located at the light emitting side of the corresponding laser 101. The laser light emitted by each laser 101 can be emitted out after passing through the corresponding light combining lens group 102, convex cylindrical lens 103, concave cylindrical lens 104, converging lens 105 and light homogenizing part 106 in sequence. Specifically, the light combining lens group 102, the convex cylindrical lens 103 and the concave cylindrical lens 104 may be sequentially arranged along a first direction (e.g., x direction). Each laser 101 may emit laser light to a corresponding light combining set 102. Each light combining lens group 102 may emit laser light emitted by the corresponding laser 101 to a convex cylindrical lens 103 along a first direction, the convex cylindrical lens 103 is configured to converge the emitted laser light to a concave cylindrical lens 104, the concave cylindrical lens 104 is configured to collimate the emitted laser light and emit the collimated laser light to a converging lens 105, the converging lens 105 is configured to converge the emitted laser light to a light homogenizing part 106, and the light homogenizing part 106 is configured to homogenize the emitted laser light and emit the homogenized laser light.

In the embodiment of the present application, on the convex cylindrical lens 103, the orthographic projections of the plurality of light combining lens assemblies 102 may be sequentially arranged along a second direction (e.g., y direction), and the orthographic projection of each light combining lens assembly 102 is located outside the orthographic projections of the other light combining lens assemblies 102. Therefore, it can be avoided that a certain light combining lens set blocks the laser emitted by other light combining lens sets from propagating to the convex cylindrical lens 103. The orthographic projection of the light combining lens group 102 on the convex cylindrical lens 103 may refer to the orthographic projection of the light combining lens group 102 on a surface of the convex cylindrical lens 103 close to the light combining lens group 102, or may refer to the orthographic projection of the light combining lens group 102 on a surface of the convex cylindrical lens 103 away from the light combining lens group 102.

A straight generatrix of the cambered surface in the convex cylindrical lens 103 and a straight generatrix of the cambered surface in the concave cylindrical lens 104 are both vertical to the second direction; the first direction is perpendicular to the second direction. It should be noted that a cylinder (cylinder) may be a portion of a side of a cylinder, and a straight generatrix of the cylinder is parallel to a height direction of the cylinder. The cylindrical surface has a curvature in one of two perpendicular directions, that is, the curvature of the cylindrical surface in the direction is not 0; and in the other direction, there is no curvature, i.e., the curvature of the cylinder in that direction is 0. The extending direction of the straight generatrix of the cylindrical surface is also the direction of curvature 0 of the cylindrical surface. Each of the convex cylindrical lens 103 and the concave cylindrical lens 104 may include two faces opposing in the first direction. One of the two surfaces of the convex cylindrical lens 103 may be a plane and the other surface may be a convex arc surface, or both surfaces may be convex arc surfaces, and the convex arc surfaces are convex cylindrical surfaces. One of the two surfaces of the concave cylindrical lens 104 may be a plane surface and the other surface may be a concave arc surface, or both the two surfaces may be concave arc surfaces, and the concave arc surfaces are concave cylindrical surfaces.

For example, the straight generatrix of the convex cylinder in the convex cylindrical lens 103 and the straight generatrix of the concave cylindrical lens in the concave cylindrical lens 104 may be parallel to a third direction perpendicular to the first direction and perpendicular to the second direction. The curvatures of the convex cylindrical surface of the convex cylindrical lens 103 and the concave cylindrical surface of the concave cylindrical lens 104 in the third direction are both 0. The third direction may be the z direction in fig. 3, i.e. the direction perpendicular to the plane of the paper in fig. 2. Optionally, the curvature radius of the convex cylindrical surface in the convex cylindrical lens 103 in the embodiment of the present application in the second direction may range from 15 mm to 30 mm; the radius of curvature of the concave cylinder in the concave cylinder lens 104 in the second direction may range from 3.75 mm to 7.5 mm. The convex cylindrical lens 103 may have a thickness ranging from 3 mm to 5 mm, and the concave cylindrical lens 104 may have a thickness ranging from 1.5 mm to 3 mm. The focal point of the convex cylindrical lens 103 and the focal point of the concave cylindrical lens 104 may coincide, and the distance between the focal point of the convex cylindrical lens 103 and the concave cylindrical lens 104 is designed based on this. The refractive index ranges of the convex cylindrical lens 103 and the concave cylindrical lens 104 may be 1.5 to 1.7. In the embodiment of the present application, the distance between the lenses, the thickness of the lenses, the refractive index of the lenses, and the like may be adjusted accordingly according to specific situations, and the embodiment of the present application is not limited herein.

Optionally, the orthographic projection of the convex cylindrical lens 103 covers the orthographic projection of each light combining lens group 102 on a reference plane, which is perpendicular to the first direction. It should be noted that the reference plane is only an imaginary plane for describing the relationship between the position and the size of each device, and may not be a plane actually existing in the projection light source. Optionally, the size and the structural model of each laser 101 in the projection light source 10 are all the same, and the size and the structure of each light combining group 102 are also all the same. The size structure of each light combining lens set 102 needs to match the size structure of the corresponding laser. The size and structure of each laser 101 in the projection light source 10 may also be different, and accordingly, the size and structure of each light combining lens group 102 may also be different. When the number of the light combining lens sets 102 is greater than 2, the central points of the orthographic projections of the light combining lens sets 102 on the reference plane may be collinear.

Each light combining group 102 can emit laser into the convex cylindrical lens 103 along a first direction, and a plurality of light spots formed on the convex cylindrical lens 103 by the laser emitted by each light combining group 102 can be sequentially arranged along a second direction. The laser emitted by each light combining lens group 102 can be regarded as a laser beam as a whole, and a plurality of light spots formed on the convex cylindrical lens 103 can be regarded as a light spot as a whole. The laser beam is in a flat and long strip shape, the aspect ratio (namely the ratio of the length to the width) of the whole facula formed by the laser beam is larger, and the length direction is the second direction.

After the laser beam is incident on the convex cylindrical lens 103, the laser beam can be condensed in the second direction by the convex cylindrical lens 103, so that the aspect ratio of a light spot formed by the laser beam is reduced. After the laser beam is shrunk in the second direction by the convex cylindrical lens 103, the laser beam can be converged in the second direction, and the divergence angle of the laser beam in the second direction can be correspondingly gradually reduced. In the embodiment of the present application, the convex cylindrical lens 103 emits the laser beam to the concave cylindrical lens 104, and the concave cylindrical lens 104 can collimate the laser beam in the second direction, so that the laser emitted from the concave cylindrical lens 104 approaches parallel light, thereby facilitating the utilization of subsequent laser. Since the laser beam emitted from the laser 101 is collimated, it is not necessary to collimate the laser beam in the first direction. The laser light emitted from the concave cylindrical lens 104 is condensed by the condenser lens 105 to the light uniformizing unit 106. The spot formed by the laser beam emitted from the condensing lens 105 can be regarded as a spot formed by the laser beam emitted from the concave cylindrical lens 104 which is reduced in equal proportion.

In the projection light source, the higher the matching degree between the laser beam emitted to the dodging member and the dodging member is, the better the light receiving effect of the laser beam is, the higher the utilization rate is, and the better the projection screen display effect formed by the laser beam is. If the light homogenizing member is a light guide, the light homogenizing member has a light inlet, and the light inlet may be rectangular, and the aspect ratio of the rectangle is fixed. The aspect ratio of the spot formed when the laser beam is emitted to the light inlet of the dodging member is closer to the aspect ratio of the rectangle, and the matching degree of the laser beam and the dodging member is higher. The aspect ratio of the light inlet of the light homogenizing component can be small, such as the aspect ratio is 16: 9. Optionally, the aspect ratio may also be 15:8, or other ratios, and the embodiments of the present application are not limited thereto. Optionally, the light uniformizing component may also be a fly eye lens or other components with a light uniformizing function, and the embodiment of the present application is not limited.

Optionally, laser light emitted by a projection light source in the projection device needs to be emitted to the light valve, and the light valve modulates the laser light based on the image to be projected, and then performs subsequent image projection based on the laser light. The shape of the light inlet of the light homogenizing part in the projection light source can be matched with the shape of the light valve, so that the formation effect of a projection picture is better.

In the embodiment of the application, the laser emitted to the convex cylindrical lens is flat and long strip-shaped as a whole, and the length can be shortened through shaping of the convex cylindrical lens and the concave cylindrical lens, so that the length-width ratio of a light spot formed by the laser is smaller, and the matching degree of the laser and the dodging component is improved. Illustratively, fig. 4 is a schematic diagram of a laser-formed light spot provided in an embodiment of the present application. After the laser sequentially passes through the convex cylindrical lens and the concave cylindrical lens, a light spot formed by the laser can be changed from a first light spot in fig. 4 to a second light spot. The first light spot can be a light spot formed by the laser on the convex cylindrical lens, and the second light spot can be a light spot formed by the laser when the laser is emitted out of the concave cylindrical lens. As can be seen from fig. 4, after the laser passes through the convex cylindrical lens and the concave cylindrical lens, the light spot formed by the laser is compressed in the length direction, the length-width ratio of the laser is reduced, and the laser is closer to the shape of the light inlet of the light uniformizing component, thereby being beneficial to the light collection and utilization of the laser and being beneficial to the subsequent image projection.

To sum up, in the projection light source provided by the embodiment of the application, the projection light source may include a plurality of lasers, and then the projection light source may emit laser with higher brightness, and the display brightness of the projection image formed based on the laser is higher, so that the display effect of the projection image may be improved.

With continued reference to fig. 2 and fig. 3, the plurality of lasers 101 in the projection light source 10 may be sequentially arranged along the second direction (i.e., the y direction). Each laser 101 and the corresponding light combining lens group 102 may be sequentially arranged along a third direction (i.e., a z direction), and the laser 101 is configured to emit laser light along the third direction, and the laser light is emitted to the corresponding light combining lens group 102. The plurality of lasers 101 may be aligned in the second direction, and accordingly, the plurality of light combining groups 102 are also aligned in the second direction. The distances between the light combining lens groups 102 and the convex cylindrical lens 103 are equal. Optionally, the positions of the lasers 101 may also be staggered in the second direction, the positions of the light combining lens groups 102 may also be staggered in the second direction, and the distances from the convex cylindrical lens 103 to the different light combining lens groups 102 may also be different. For example, the position of either laser 101 of fig. 2 may also be moved to the left or right by some distance.

In the embodiment of the present application, the projection light source 10 includes two lasers 101 for illustration. Alternatively, the number of lasers 101 in the projection light source 10 may be 3, 4 or even more. The setting position of each laser 101 can also be adjusted accordingly, but it is necessary to ensure that there is no overlap in the transmission paths of the laser beams emitted by different lasers 101 after being reflected by the corresponding light combining lens group 102. Fig. 5 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. As shown in fig. 5, the projection light source 10 may include three lasers 101, two lasers 101 of the three lasers 101 being aligned along the second direction, and the other laser being located between the two lasers in the second direction and being staggered from the two lasers in both the first direction and the second direction.

Each laser 101 in the projection light source 10 will be described with reference to the drawings.

The laser 101 in the embodiment of the present application may be a monochromatic laser, or may also be a multi-color laser. A monochromatic laser is a laser that can emit laser light of only one color, and a multicolor laser is a laser that can emit laser light of a plurality of colors. If the laser 101 is a monochromatic laser, different lasers 101 may be used to emit laser beams of different colors, or may be all used to emit laser beams of the same color, and the embodiment of the present application is not limited. And the following embodiments of the present application will be described by taking as an example that each laser 101 in the projection light source 10 is a multi-color laser.

Fig. 6 is a schematic structural diagram of a laser provided in an embodiment of the present application, and fig. 7 is a schematic structural diagram of another laser provided in an embodiment of the present application. Fig. 6 may be a top view of the laser shown in fig. 7, and fig. 7 may be a schematic view of section a-a' in the laser shown in fig. 6. Referring to fig. 2, fig. 3, fig. 6 and fig. 7, the laser 101 may include a base 1011 and a plurality of light emitting modules (not shown). The plurality of light emitting modules are all located on the bottom plate 1011, and the plurality of light emitting modules can be sequentially arranged along a first direction. Each light emitting module may include a ring-shaped pipe wall 1012 and a plurality of light emitting chips 1013 surrounded by the pipe wall 1012. Fig. 6 and fig. 7 illustrate that the laser 101 includes two light emitting modules, optionally, the number of the light emitting modules in the laser 101 may also be 3, 4 or more, and the embodiment of the present application is not limited thereto.

Alternatively, each light emitting module may have an elongated shape, and an orthographic projection of each light emitting module on the base plate 1011 may have a substantially rectangular shape. The rectangular shape may have a width direction parallel to the first direction and a length direction parallel to the second direction. Alternatively, the width direction of the rectangle may be parallel to the second direction, and the width direction may be parallel to the first direction. Alternatively, each tube wall 1012 may be square ring shaped. The orthographic projection of each tube wall 1012 on the base 1011 may be rectangular or substantially rectangular. For example, the orthographic projection may be a rounded rectangle or a chamfered rectangle. The rounded rectangle is a shape obtained by changing the corners of the rectangle into rounded corners, and the chamfered rectangle is a shape obtained by changing the corners of the rectangle into chamfered corners.

As shown in fig. 6, the plurality of light emitting chips 1013 in each light emitting module may be arranged in a row along the second direction. Alternatively, the slow axes of the laser light emitted from the plurality of light emitting chips 1013 in each light emitting module may be all parallel to the arrangement direction of the chips 1013. It should be noted that the transmission speeds of the laser in different light vector directions may differ, the light vector direction with the fast transmission speed is a fast axis, the light vector direction with the slow transmission speed is a slow axis, and the fast axis is perpendicular to the slow axis. The fast axis can be perpendicular to the surface of the light emitting chip 1013 and the slow axis is parallel to the surface of the light emitting chip 1013, e.g., the fast axis is the z-direction and the slow axis is the y-direction. The divergence angle of the laser light in the fast axis is larger than the divergence angle in the slow axis, e.g. the divergence angle in the fast axis is substantially more than 3 times the divergence angle in the slow axis. The light emitting chips 1013 are arranged with the slow axis of the emitted laser light as the arrangement direction. Since the divergence angle of the laser light in this direction is small, the distance between the light emitting chips 1013 can be small and the arrangement density of the light emitting chips 1013 can be large while avoiding the interference and overlapping of the laser light emitted from the adjacent light emitting chips 1013, which is beneficial to the miniaturization of the laser. Optionally, the plurality of light emitting chips 1013 in the light emitting module may also be arranged in an array, and arranged in multiple rows and multiple columns, which is not limited in the embodiment of the present application.

Optionally, with continued reference to fig. 2, fig. 3, fig. 6, and fig. 7, each light emitting module may further include a collimating mirror group 1014, a plurality of heat sinks 1015, a plurality of reflective prisms 1016, and a light transmissive sealing layer 1018. The plurality of heat sinks 1015 and the plurality of reflection prisms 1016 may each correspond to the plurality of light emitting chips 1013 in the light emitting module one to one. Each light emitting chip 1013 is positioned on a corresponding heat sink 1015, and the heat sink 1015 is used to assist the heat dissipation of the corresponding light emitting chip 1013. The material of the heat sink 1015 may include ceramic. Each reflecting prism 1016 is located at the light exit side of the corresponding light emitting chip 1013. Light transmissive sealing layer 1018 is positioned on the side of tube wall 1012 remote from base 1011 to seal the opening in the side of tube wall 1012 remote from base 1011 to form a sealed space with base 1011 and tube wall 1012. Alternatively, the laser 101 may not include the light transmissive sealing 1018, but may be directly attached to the surface of the tube wall 1012 remote from the base 1011 by the collimating mirror assembly 1014. Thus, the collimating lens assembly 1014, the tube wall 1012 and the base plate 1011 together form a sealed space.

The collimating mirror array 1014 is located on the side of the light transmissive encapsulant 1018 remote from the base 1011. The collimating lens group 1014 includes a plurality of collimating lenses (not shown) corresponding to the plurality of light emitting chips 1013 one to one. In the present embodiment, the collimating lenses in each collimating lens group 1014 can be integrally formed. Illustratively, the collimator lens group 1014 has a substantially plate shape, one surface of the collimator lens group 1014 close to the base plate 1011 is a plane, one surface of the collimator lens group 1014 far from the base plate 1011 has a plurality of convex arc surfaces, and a portion of each of the convex arc surfaces is a collimator lens.

The light emitting chips 1013 may emit laser light to the corresponding reflecting prisms 1016, and the reflecting prisms 1016 may reflect the laser light to the collimating lenses corresponding to the light emitting chips 1013 in the collimating lens group 1014 along a direction (e.g., z direction) away from the base plate 1011, so that the laser light may be collimated by the collimating lenses and then emitted.

In the embodiment of the present application, the light emitting chips 1013 in different light emitting modules in the laser 101 may be used to emit laser light of different colors. It should be noted that the light emitting chips may be divided according to light emitting colors, each type of light emitting chip may emit laser light of one color, and different types of light emitting chips are used for emitting laser light of different colors. In the embodiment of the present application, different light emitting modules in the laser 101 may include different types of light emitting chips. Each light emitting module may include only one type of light emitting chip, or there may be a plurality of types of light emitting chips included in the light emitting module.

For example, as shown in fig. 6, the laser 101 may include a first light emitting module and a second light emitting module, the first light emitting module may be the light emitting module located on the left side in fig. 6, and the second light emitting module may be the light emitting module located on the right side in fig. 6. The first light emitting module may include a plurality of first type light emitting chips 1013a, and the second light emitting module may include a plurality of second type light emitting chips 1013b and a plurality of third type light emitting chips 1013 c. The wavelengths of the laser light emitted from the first type 1013a, the second type 1013b, and the third type 1013c decrease in sequence. For example, the first type 1013a, the second type 1013b, and the third type 1013c of the light emitting chip emit red laser light, green laser light, and blue laser light, respectively. The laser light emitted by the three types of light emitting chips may also be in other colors, for example, the second type of light emitting chip 1013b is used for emitting yellow laser light, and the embodiment of the present application is not limited. Further, the laser may also include three light emitting modules, which respectively include the first type light emitting chip 1013a, the second type light emitting chip 1013b, and the third type light emitting chip 1013 c.

In the embodiment of the present application, the number of the first type of light emitting chips 1013a in the first light emitting module is 4, the number of the second type of light emitting chips 1013b in the second light emitting module is 3, and the number of the third type of light emitting chips 1013c is 2. The number of the three types of light emitting chips may also be adjusted accordingly according to the requirement, for example, the number of the first type of light emitting chips 1013a may also be 5 or another value, the number of the second type of light emitting chips 1013b may also be 4 or another value, and the number of the third type of light emitting chips 1013c may also be 3 or another value, which is not limited in the embodiment of the present application.

Optionally, each laser 101 in the projection light source 10 in the embodiment of the present application may be a laser with the same structure, and two lasers 101 in fig. 2 may be the lasers 101 shown in fig. 6. In fig. 2, the two light emitting modules in the upper laser 101 are the second light emitting module and the first light emitting module in sequence along the first direction, and the two light emitting modules in the lower laser 101 are the first light emitting module and the second light emitting module in sequence along the first direction.

Referring to fig. 2, fig. 4 and fig. 6, the second light emitting module in each of the two lasers 101 can satisfy: the second type of light emitting chip 1013b is located at an end of the tube wall 1012 remote from the other laser 101. This ensures that the green laser beam is located at the edge position in the overall laser beam emitted by the two lasers 101. The laser light emitted by the two lasers 101 may form the spot of fig. 4. Here, the light spot G1 indicates a red light spot, which is formed by the red laser light emitted from the first type light emitting chip 1013 a. The light spot G2 indicates a green light spot, which is formed by the green laser light emitted from the second type light-emitting chip 1013 b. The spot G3 indicates a blue spot, which is formed by the blue laser light emitted from the third type light-emitting chip 1013 c. As shown in fig. 4, the distance between the green spots is relatively large.

It should be noted that, when the projection image is formed by using laser, if the uniformity of the laser is poor, the formed projection image may have a speckle phenomenon, which affects the display effect of the projection image, and the influence of the green laser on the speckle phenomenon is large. After the laser beam is emitted by each optical device in the projection light source, the uniformity of the laser at the edge position in the laser beam is higher. Through the setting to emitting chip in the laser instrument in this application embodiment, make green laser be located the both ends of whole laser beam, so through subsequent light path, green laser's homogeneity is higher, and then can play the better effect of eliminating the speckle to the projection picture that forms, improves the display effect of projection picture.

Optionally, with continued reference to fig. 2 and 6, the laser 101 may further include a plurality of power supply pins 1017. The plurality of power pins 1017 are located on the base 1011 outside the envelope of each of the walls 1012. The power supply pins 1017 are connected to an external power source, and can be electrically connected to the light emitting chips 1013 surrounded by the tube walls 1012, so as to transmit current to the light emitting chips 1013, and trigger the light emitting chips 1013 to emit laser light. The plurality of power pins 1017 in each laser 101 may be located on the same side of the plurality of tube walls 1012 in the laser 101. This facilitates uniform current supply to the light emitting chips 1013 surrounded by the tube walls 1012, and facilitates the arrangement of the tube walls 1012 and the corresponding light emitting chips 1013.

The plurality of power supply pins 1017 may include a plurality of positive pins and at least one negative pin. The positive electrode pin is used for being connected with the positive electrode of an external power supply, and the negative electrode pin is used for being connected with the negative electrode of the external power supply. Each of the light emitting chips 1013 is electrically connected to one positive electrode pin and one negative electrode pin. Alternatively, each light emitting chip 1013 in the laser 101 may be connected to the same negative pin and to different positive pins, that is, the light emitting chips 1013 share the negative pin. And each positive electrode pin is only connected with one type of light-emitting chip, and different types of light-emitting chips are connected with different positive electrode pins. Because the currents required by the different types of light-emitting chips to emit the laser with the corresponding colors are different, different currents need to be applied to the different types of light-emitting chips, and at least one pin needs to be different in the anode pin and the cathode pin connected with the different types of light-emitting chips. When all the light-emitting chips share the negative electrode pin, the positive electrode pin can not be shared.

For example, as shown in fig. 2 and 6, the laser 101 includes four power supply pins 1017, three of which are positive pins, and the remaining one of which is a negative pin. The negative pin is electrically connected with each light-emitting chip in the laser. The three positive electrode pins are electrically connected to the first type light emitting chip 1013a, the second type light emitting chip 1013b, and the third type light emitting chip 1013c, respectively, so as to transmit current to the corresponding light emitting chips, respectively. Optionally, at least two types of light emitting chips in the laser 101 may also be connected to the same positive electrode pin and to different negative electrode pins, that is, the at least two types of light emitting chips share the positive electrode pin. Or, any two types of light-emitting chips are connected with different anode pins and different cathode pins, that is, the light-emitting chips do not share a power supply pin.

Alternatively, a power supply terminal may be provided on the tube wall 1012, so that the light emitting chip surrounded by the tube wall 1012 is connected to a power supply pin outside the tube wall 1012 through the power supply terminal. This switching can be achieved, for example, by providing wires between the light-emitting chip and the supply terminals, and between the supply terminals and the supply pins. Or the connection between the light emitting chips and the corresponding power supply pins may be performed in other realizable manners, and the connection manner between each light emitting chip and the corresponding power supply pin is not limited in the embodiment of the present application.

With continued reference to fig. 2, in the two lasers 101 arranged along the second direction in the projection light source 10 in the embodiment of the present application, the power supply pin 1017 in each laser 101 may be located at an end far from the other laser 101. Therefore, when the power supply pin 1017 is connected with an external power supply, the circuit is not blocked by the light emitting module in the laser 101, and the circuit connection of the laser 101 is ensured to be convenient.

The light combining lens group 102 in the embodiment of the present application is described below with reference to the drawings.

Each light combining lens group 102 may include a plurality of light combining lenses sequentially arranged along the first direction. Each light combining lens is located on one side of one light emitting module in the laser 101, which is far away from the bottom plate 1011, and the light combining lens corresponds to the light emitting module. The orthographic projection of each light combining lens on the bottom plate 1011 of the laser 101 can cover the corresponding light emitting module. The light combining lens can be obliquely arranged, and the light emitting module and the convex cylindrical lens 103 are positioned on the same side of the light combining lens. The plurality of light combining lenses can be parallel, and included angles between the plurality of light combining lenses and the first direction can be 45 degrees. Each light-emitting module can emit laser to the corresponding light-combining lens, and the light-combining lens can reflect the laser emitted by the corresponding light-emitting module and turn the transmission path of the laser by 90 degrees.

The size of the light combining lens can be determined based on the size of the corresponding light emitting module. Alternatively, the size of each light combining lens may be the same. Optionally, orthographic projections of the light combining lenses on the convex cylindrical lens 103 can be overlapped, so that it can be ensured that laser light emitted by different light emitting modules in the laser 101 can be mixed after being reflected by the light combining lenses. Alternatively, the heights of the light combining sets 102 may be the same. Therefore, the laser emitted by each light combining lens group 102 can be ensured to form a regular strip-shaped light spot on the convex cylindrical lens 103.

With continued reference to fig. 3, the light combining lens assembly 102 may include a first light combining lens P1 and a second light combining lens P2 arranged along the x direction. The first combiner P1 can reflect the laser beam emitted from the laser 101 to the first combiner P1 to the second combiner P2. The second light combining lens P2 may reflect the laser light emitted from the laser 101 to the second light combining lens P2 toward the convex cylindrical lens 103, and transmit the laser light emitted from the first light combining lens P1 to the second light combining lens P2 toward the convex cylindrical lens 103.

Optionally, the light combining lens farthest from the convex cylindrical lens 103 in the light combining lens group 20 may be a reflecting mirror for a full spectrum; the other light combining lenses can be dichroic mirrors, and are used for reflecting the laser light emitted from the corresponding light emitting modules to the dichroic mirrors and transmitting the laser light emitted from the light combining lenses far away from the convex cylindrical lenses 103. Optionally, the light combining lens farthest from the converging lens 30 may also be a dichroic mirror, and this embodiment of the present application is not limited. For example, the first light combining lens P1 in the two light combining lens groups 102 of fig. 2 may be a total reflection lens. The second light combining lens P2 in the upper light combining lens group 102 may be a dichroic mirror that transmits blue-green light and reflects red light, and the second light combining lens P2 in the lower light combining lens group 102 may be a dichroic mirror that transmits red light and reflects blue-green light.

In the embodiment of the present application, each laser 101 in the projection light source 10 is a multi-color laser. The laser 10 emits laser light of a plurality of colors including two types of laser light having orthogonal polarization directions. For example, the polarization direction of the laser emitted from one part of the plurality of light emitting modules of the laser 101 is perpendicular to the polarization direction of the laser emitted from another part of the plurality of light emitting modules. For example, in the laser, the red laser emitted by the first light emitting module is P-polarized light, and the green laser and the blue laser emitted by the second light emitting module are both S-polarized light. The polarization direction of the P-polarized light is perpendicular to the polarization direction of the S-polarized light. Because the reflection characteristics of different polarized lights are different, if two lasers with different polarization directions are adopted to form a projection picture together, the light quantity of the two lasers reflected into human eyes on a screen is different, and further color unevenness of the projection picture seen by the human eyes may be caused, and the display effect of the projection picture is further influenced.

Fig. 8 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. As shown in fig. 8, on the basis of fig. 2 and 3, the projection light source 10 may further include a plurality of half-wave plates 107 in one-to-one correspondence with the plurality of lasers 101, and each half-wave plate 107 is located on the light emitting side of the corresponding laser 101. The half-wave plate 107 may be located on the transmission path of the laser light of either polarization direction emitted by the laser 101 to adjust the polarization direction of the laser light to be the same as that of the other laser light. Furthermore, a projection picture with a good display effect can be formed based on the laser with the same polarization direction. For example, as shown in fig. 8, a half-wave plate 107 may be located on the light-emitting side of the first light-emitting module in the laser 101 to deflect the polarization direction of the red laser light emitted by the first light-emitting module by 90 degrees, so as to ensure that the polarization direction of the red laser light is the same as the polarization directions of the green laser light and the blue laser light. Optionally, the half-wave plate 107 may also be located on the light exit side of the second light emitting module in the laser 101, so as to deflect the polarization directions of the green laser light and the blue laser light emitted by the second light emitting module by 90 degrees, and ensure that the polarization directions of the green laser light and the blue laser light are the same as the polarization direction of the red laser light.

It should be noted that, in the embodiment of the present application, the laser 101 includes two light emitting modules as an example. If the laser 101 includes three light emitting modules, one of the light emitting modules emits P-polarized light, and the other two light emitting modules emit S-polarized light, the half-wave plate 107 may be located on the light emitting side of the light emitting module, or may be located on the light emitting sides of the two light emitting modules. When the laser 101 includes other types of light emitting modules, the setting mode of the half-wave plate 107 may also be changed accordingly, and details are not described in this embodiment.

Alternatively, the light uniformizing part 106 in the projection light source 10 of the embodiment of the present application may be a light guide. The projection of the projection picture has a certain relation with the light inlet of the light guide pipe, and the display effect of the projection picture is also related to the polarization direction of the laser emitted to the light inlet of the light guide pipe. The light entrance of the light guide is rectangular, and when the polarization direction of the laser light emitted to the light entrance is parallel to the short side of the light entrance, that is, parallel to the width direction of the rectangle, the display effect of the projection picture formed by the laser light emitted from the light guide is good. The placement position of the half-wave plate 107 can be determined based on this principle in the embodiment of the present application.

For example, for the projection light source 10 shown in fig. 8, if the short side of the light guide is parallel to the second direction (i.e. y direction) and the long side is parallel to the third direction (i.e. direction perpendicular to the paper), the half-wave plate 107 is located on the light-emitting side of the first light-emitting module in the laser 101, i.e. on the light-emitting side of the P-polarized light. If the long side of the light guide is parallel to the second direction (i.e. y direction) and the short side is parallel to the third direction (i.e. direction perpendicular to the paper), the half-wave plate 107 is located on the light-emitting side of the second light-emitting module in the laser 101, i.e. on the light-emitting side of the S-polarized light.

Alternatively, whether the half-wave plate 107 is disposed in the projection light source 10 may also be related to the structure and usage of the projection device in which the projection light source 10 is disposed. For example, if the projection device where the projection light source 10 is located is a long-focus projection device, that is, the projection lens in the projection device is a long-focus lens, or the projection screen of the projection device is a screen capable of generating lambertian scattering, the projection light source 10 may not include a half-wave plate. When the projection equipment is used for projecting the picture, the distance between the lens and the screen is far, the incident angle of the laser on the screen is small, the probability that the laser in different polarization directions is reflected to the outside of the viewing area of the projection picture is small, the influence on the viewing effect of the projection picture by human eyes is small, and therefore the requirement can be met without adjusting the polarization directions of different polarized lights. For another example, if the projection apparatus where the projection light source 10 is located is equipped with a fresnel screen whose surface has a certain specular reflection, and if the projection apparatus is an ultra-short-focus projection apparatus, the distance between the lens and the screen is short, the incident angle of the laser light on the screen is large, and the position difference of the areas to which the laser light in different polarization directions is reflected is large. Therefore, the half-wave plate can be arranged to adjust the polarization directions of different polarized lights, and all lasers are guaranteed to be uniformly reflected to the viewing area of the projection picture.

Optionally, in the embodiment of the present application, the projection light source 10 may further include a diffusion sheet located between the concave cylindrical lens 104 and the condensing lens 105, and/or a diffusion sheet located between the condensing lens 105 and the light uniformizing part 106. That is, in the first alternative, a diffusion sheet may be provided between the concave cylindrical lens 104 and the condensing lens 105, and no diffusion sheet is provided between the condensing lens 105 and the light uniformizing member 106. In a second alternative, a diffusion sheet may not be disposed between the concave cylindrical lens 104 and the condenser lens 105, and a diffusion sheet may be disposed between the condenser lens 105 and the light uniformizing part 106. In a third alternative, a diffusion sheet is disposed between the concave cylindrical lens 104 and the condensing lens 105, and between the condensing lens 105 and the light uniformizing part 106.

This third alternative is illustrated below as an example. Fig. 9 is a schematic structural diagram of a projection light source according to another embodiment of the present application. As shown in fig. 9, on the basis of fig. 2, the projection light source 10 may further include a first diffusion sheet 108 between the concave cylindrical lens 104 and the condensing lens 105, and a second diffusion sheet 109 between the condensing lens 105 and the light unifying member 106. Each diffusion sheet can diffuse and homogenize the laser injected into the diffusion sheet, so that the uniformity of the injected laser can be better ensured, and the speckle phenomenon of a projection picture formed based on the laser is reduced.

Alternatively, each diffuser in the embodiments of the present application may be a fixed diffuser, or may also be a rotatable, vibratable, or movable diffuser. For example, the first diffusion sheet 108 may be a fixed diffusion sheet, and the second diffusion sheet 109 may be a rotatable diffusion sheet, which may also be referred to as a diffusion wheel.

Alternatively, for a fixed diffuser, the projection light source 10 may further include: the diffusion sheet corresponds to a fixing member (not shown in the drawings), and the diffusion sheet can be fixed in position by the corresponding fixing member. For example, the fixing part may be a snap structure provided on a certain housing for snapping the edge of the diffusion sheet to fix the diffusion sheet. For a rotatable, vibratable or movable diffuser, the projection light source 10 may further include: and a driving member (not shown) coupled to the diffusion sheet for driving the diffusion sheet to move, rotate or vibrate in a target direction. For example, the diffuser may be driven to move or vibrate back and forth in a direction perpendicular to the direction of travel of the laser light. If the driving member is a rotary motor, the rotary motor can be fixed at the center of the diffusion sheet to drive the diffusion sheet to rotate around the axis h.

Optionally, with continuing reference to fig. 9, the projection light source 10 may further include: a mirror 110. The light combining lens group 102, the convex cylindrical lens 103, the concave cylindrical lens 104 and the reflecting mirror 110 may be sequentially arranged along a first direction, and the reflecting mirror 110, the converging lens 105 and the light uniformizing part 106 may be sequentially arranged along a second direction. Alternatively, the reflecting mirror 110, the condensing lens 105 and the light unifying part 106 may be arranged in sequence along the third direction. Alternatively, the first diffusion sheet 108 may be positioned between the reflecting mirror 110 and the condensing lens 105. Since the projection light source 10 includes many components, the reflecting mirror 110 can fold the laser beam transmission path to reduce the length of the optical path, which is advantageous for downsizing the projection light source 10.

The embodiment of the application also provides a projection device which can comprise a projection light source, a light valve and a lens. The projection light source may be any of the projection light sources described above, such as the projection light source 10 of any of fig. 2, 3, 5, 8, and 9. The projection light source is used for emitting laser to the light valve, the light valve is used for modulating the emitted laser and then emitting the modulated laser to the lens, and the lens is used for projecting the emitted laser to form a projection picture.

For example, the light valve may include a plurality of reflective sheets, each of the reflective sheets may be used to form a pixel in the projection image, and the light valve may reflect the laser light to the lens by the reflective sheet corresponding to the pixel to be displayed in a bright state according to the image to be displayed, so as to modulate the light. Illustratively, the lens may be a telephoto lens, or may also be an ultra-short focus lens. The lens may include a plurality of lenses, and the lenses may be sequentially arranged in a certain direction. The laser emitted from the light valve can be sequentially transmitted to the screen through a plurality of lenses in the lens so as to realize the projection of the lens on the laser and realize the display of a projection picture.

It should be noted that in the embodiments of the present application, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "at least one" refers to one or more. The term "plurality" means two or more unless expressly limited otherwise. The term "at least one of a and B" in the present application is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. "substantially", "about", "substantially" and "close" mean within an acceptable error range, within which a person skilled in the art can solve the technical problem and achieve the technical result substantially.

In the drawings, the size of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. Like reference numerals refer to like elements throughout. Projection light source embodiments in the present application may be referred to with respect to projection device embodiments.

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. A projection light source, comprising: the device comprises a plurality of lasers and a plurality of light combination lens groups which are in one-to-one correspondence, as well as a convex cylindrical lens, a concave cylindrical lens, a converging lens and a light homogenizing component;

the light combining lens group, the convex cylindrical lens and the concave cylindrical lens are sequentially arranged along a first direction; on the convex cylindrical lens, the orthographic projections of the multiple light combining lens groups are sequentially arranged along a second direction, and the orthographic projection of each light combining lens group is positioned outside the orthographic projections of other light combining lens groups; the straight generatrix of the convex cylindrical surface in the convex cylindrical lens and the straight generatrix of the concave cylindrical surface in the concave cylindrical lens are both vertical to the second direction; the first direction is perpendicular to the second direction.

2. The projection light source of claim 1 wherein each of the plurality of lasers comprises a backplane and a plurality of light modules;

the plurality of light-emitting modules are positioned on the bottom plate and are sequentially arranged along the first direction; each light-emitting module comprises an annular pipe wall and a plurality of light-emitting chips surrounded by the pipe wall; and the light emitting chips in different light emitting modules are used for emitting laser with different colors.

3. The projection light source of claim 2, wherein the plurality of light emitting chips in each of the light emitting modules are arranged in a row along the second direction;

the plurality of light-emitting modules comprise a first light-emitting module and a second light-emitting module, the first light-emitting module comprises a plurality of first type light-emitting chips, and the second light-emitting module comprises a plurality of second type light-emitting chips and a plurality of third type light-emitting chips; the wavelengths of the laser light emitted by the first type of light-emitting chip, the second type of light-emitting chip and the third type of light-emitting chip are sequentially decreased progressively.

4. The projection light source of claim 3 wherein the plurality of lasers comprises two lasers arranged along the second direction, and each of the lasers satisfies: the second type of light-emitting chip is positioned at one end, far away from the other laser, of the tube wall.

5. The projection light source according to any one of claims 2 to 4, wherein the polarization direction of the laser light emitted by one of the plurality of light-emitting modules is perpendicular to the polarization direction of the laser light emitted by another part of the plurality of light-emitting modules;

the projection light source further comprises a half-wave plate, and the half-wave plate is located on the light emitting side of one part of the light emitting modules or on the light emitting side of the other part of the light emitting modules.

6. The projection light source of claim 5, wherein the light homogenizing member is a light guide, and the light inlet of the light guide is rectangular, and the polarization direction of the laser light emitted to the light inlet is parallel to the width direction of the rectangle.

7. The projection light source of any of claims 1 to 4, further comprising: the diffusion sheet is positioned between the concave cylindrical lens and the converging lens, and/or the diffusion sheet is positioned between the converging lens and the light homogenizing component.

8. The projection light source of claim 7, further comprising: a fixing member through which the diffusion sheet is fixed;

or the projection light source also comprises a driving part, and the driving part is connected with the diffusion sheet and is used for driving the diffusion sheet to move, rotate or vibrate along the target direction.

9. The projection light source of any of claims 1 to 4, further comprising: a mirror;

the light combining lens group, the convex cylindrical lens, the concave cylindrical lens and the reflecting mirror are sequentially arranged along the first direction, and the reflecting mirror, the converging lens and the light homogenizing component are sequentially arranged along the second direction.

10. A projection device, characterized in that the projection device comprises: the projection light source of any one of claims 1 to 9, and a light valve and lens;