1. A multicolor light source, characterized in that it comprises: the device comprises a laser, a cambered surface light reflecting structure, a diffuse reflection component and a light homogenizing component;

the laser, the cambered surface light reflecting structure and the diffuse reflection component are sequentially arranged along a target direction, and the cambered surface light reflecting structure is bent towards the side where the diffuse reflection component is located; the light homogenizing part is positioned on one side of the cambered surface light reflecting structure, which is far away from the laser, and a light incoming area of the light homogenizing part faces the cambered surface light reflecting structure;

the cambered surface light reflecting structure is provided with a transmission area and a reflection area; the laser is used for emitting laser of multiple colors to the transmission area, so that the laser penetrates through the transmission area and is emitted to the diffuse reflection component; the diffuse reflection component is used for enabling the incident laser to emit to the reflection area after diffuse reflection, and the reflection area is used for reflecting the incident laser to the light incident area of the light homogenizing component.

2. The multicolor light source according to claim 1, wherein said cambered light reflecting structure is a hemispherical shell.

3. The multicolor light source according to claim 2, wherein said diffuse reflection member and said dodging member are respectively located on both sides of the center of the sphere of said hemispherical shell.

4. The multicolor light source according to claim 2, wherein said transmissive region covers the top of said hemispherical shell.

5. The multicolor light source according to claim 1, wherein said transmission region is a through hole provided in said cambered surface light reflecting structure;

alternatively, the transmissive region includes a transparent structure.

6. The multicolor light source according to claim 1, wherein said diffuse reflection member is in the form of a plate, said diffuse reflection member being fixed;

or the diffuse reflection component is annular and is used for rotating around a rotating shaft parallel to the target direction; different areas of the diffuse reflection member receive the irradiation of the laser light emitted from the laser as the diffuse reflection member rotates.

7. The multicolor light source according to claim 1, wherein said light homogenizing member is a wedge-shaped light pipe, a rectangular light pipe, or a fly-eye lens;

the area of the light inlet of the wedge-shaped light guide pipe is smaller than that of the light outlet, and the area of the light inlet of the rectangular light guide pipe is equal to that of the light outlet.

8. The multicolor light source of any of claims 1 to 7, further comprising a converging lens, said converging lens being positioned between said laser and said curved reflecting structure;

the laser is used for emitting laser of multiple colors to the converging lens, and the converging lens is used for converging the incident laser and then transmitting the laser to the diffuse reflection component through the transmission area.

9. The multicolor light source according to any one of claims 1 to 7, wherein said laser comprises: the laser device comprises a first light-emitting chip for emitting laser of a first color, a second light-emitting chip for emitting laser of a second color and a third light-emitting chip for emitting laser of a third color;

in the laser, the number of the first light emitting chips is greater than or equal to the number of the second light emitting chips, and the number of the third light emitting chips is greater than the number of the first light emitting chips.

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

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

Background

With the development of the photoelectric technology, the requirement for the projection effect of the projection device is higher and higher.

In the related art, a light source in a projection apparatus may emit laser light of a plurality of colors, and the light source may be referred to as a multicolor light source. The laser light with multiple colors is projected onto a screen after being modulated, so that the projection display of the projection equipment is realized. Fig. 1 is a schematic structural diagram of a multicolor light source provided by the related art. As shown in fig. 1, the multicolor light source includes: a laser 001, a light combining lens group 002 and a light uniformizing part 003. The laser 001 includes three light emitting areas sequentially arranged along the x direction for emitting green laser light, blue laser light, and red laser light, respectively. The light combining lens group 002 includes three light combining lenses sequentially arranged along the x direction, each light combining lens is located on the light emitting side of one light emitting area, and each light combining lens is used for reflecting the laser light emitted from the corresponding light emitting area along the x direction. And the second that x is on the direction closes the light mirror and can see through green glow, and the third closes the light mirror and can see through blue light and green glow, so green laser, blue laser and red laser that laser instrument 001 sent all can follow third and close the light mirror and shoot out to realize that the group of light mirror 002 mixes the light to the laser of the various colours that the laser instrument sent. The laser light after being mixed can be used to form a projection screen after being homogenized by the light homogenizing part 003.

However, in the laser light (i.e., the laser light after mixing) emitted by the light combining lens group 002 in the related art, the size difference between the light spot formed by the blue laser light and the green laser light and the light spot formed by the red laser light is large, the light mixing effect of the laser light is poor, and the display effect of the projection image formed based on the laser light is poor.

Disclosure of Invention

The application provides a multicolor light source and projection equipment, which can solve the problem of poor display effect of a projection picture of the projection equipment.

In one aspect, there is provided a multicolor light source comprising: the device comprises a laser, a cambered surface light reflecting structure, a diffuse reflection component and a light homogenizing component;

the laser, the cambered surface light reflecting structure and the diffuse reflection component are sequentially arranged along a target direction, and the cambered surface light reflecting structure is bent towards the side where the diffuse reflection component is located; the light homogenizing component is positioned on one side of the cambered surface light reflecting structure, which is far away from the laser, and a light inlet of the light homogenizing component faces the cambered surface light reflecting structure;

the cambered surface light reflecting structure is provided with a transmission area and a reflection area; the laser is used for emitting laser of multiple colors to the transmission area, so that the laser penetrates through the transmission area and is emitted to the diffuse reflection component; the diffuse reflection component is used for enabling the incident laser to emit to the reflection area after diffuse reflection, and the reflection area is used for reflecting the incident laser to the light inlet of the light homogenizing component.

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

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

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

in the multicolor light source that this application provided, the laser instrument can be with laser directive diffuse reflection part, and diffuse reflection part carries out the diffuse reflection to this laser, and later this laser can reflect to even light part through cambered surface reflecting structure. The diffuse reflection component has a good light mixing effect on the incident laser, so that the light mixing uniformity of the laser emitted by the multicolor light source can be improved, and the projection effect of the projection equipment where the multicolor light source is located is improved.

Drawings

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

FIG. 1 is a schematic diagram of a multi-color light source provided by the related art;

FIG. 2 is a schematic structural diagram of a multicolor light source provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of another multicolor light source provided by the embodiments of the present application;

FIG. 4 is a schematic structural diagram of a diffuse reflection component according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a multi-color light source according to an embodiment of the present disclosure;

fig. 6 is a schematic layout diagram of light emitting chips in a laser according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a projection apparatus according to an 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 requirement for the display effect of the projection picture of the projection device is higher and higher. When the light source of the present projection apparatus includes a single three-color laser, the blue laser beam and the green laser beam emitted by the laser are both thinner than the red laser beam. On a plane perpendicular to the light beam emitting direction of the light combining lens group, the difference of the sizes of the light spots of the laser beams with the three colors is large, the color uniformity of the light spots formed by combining the light beams with the three colors by the light combining lens and emitting the combined light is poor, and the light mixing effect of the light combining lens group on the laser tube bundles with the three colors is poor. Therefore, the color uniformity of the projection screen formed based on the laser beam is also poor, and the display effect of the projection screen is poor.

The embodiment of the application provides a multicolor light source and projection equipment, can improve the mixed light effect of the laser of different colours in the projection equipment, improve the colour homogeneity of the facula that forms after the laser of each colour is closed in the projection equipment, and then improve the display effect of projection picture that projection equipment formed according to this laser.

Fig. 2 is a schematic structural diagram of a multicolor light source provided in an embodiment of the present application. As shown in fig. 2, the multicolor light source 10 may include: a laser 101, a cambered surface light reflecting structure 102, a diffuse reflection part 103 and a light evening part 104.

The laser 101, the curved reflecting structure 102 and the diffuse reflection component 103 are sequentially arranged along a target direction (e.g., a y direction in fig. 1), and the curved reflecting structure 102 is bent toward the diffuse reflection component 103. The dodging feature 104 is located on a side of the curved light reflecting structure 102 away from the laser 101. The dodging part 104 has a light entering region and a light exiting region, the light entering region of the dodging part 104 faces the cambered surface light reflecting structure 102, and the light exiting region is located on one side of the dodging part far away from the cambered surface light reflecting structure 102. The curved light reflecting structure 102 may have a transmissive region and a reflective region.

The laser 101 is used for emitting laser light with multiple colors to the transmission region of the cambered surface light reflecting structure 102, so that the laser light with multiple colors all penetrates through the transmission region to be emitted to the diffuse reflection component 103. The diffuse reflection component 103 is used for emitting the incident laser light to the reflection area of the cambered surface light reflection structure 102 after the incident laser light is subjected to diffuse reflection, and the reflection area is used for reflecting the incident laser light to the light inlet area of the light homogenizing component 104.

The diffuse reflection member diffuses the incident light and then allows the light to be emitted in all directions, and the maximum emission angle of the light is close to 180 degrees. In the embodiment of the application, the laser can be all shot to the diffuse reflection part with the laser of the multiple colors that it sent, and the diffuse reflection part makes the light-emitting angle scope of this multiple color's laser basically unanimous after carrying out the diffuse reflection with this multiple color's laser, if all shoot out in the scope of 0 ~ 180 degree. So this multi-colored laser can all shoot to the same region (like the reflecting region of cambered surface reflecting structure) and mix the light in transmission process, and the mixed light effect of this multi-colored laser is better, and it is higher to mix the light homogeneity. The reflecting region can uniformly reflect the incident laser to the light incident region of the light homogenizing component, and further the uniformity of the laser which is emitted to the light homogenizing component is high.

To sum up, in the multicolor light source provided by the embodiment of the application, the laser can emit laser to the diffuse reflection component, the diffuse reflection component performs diffuse reflection on the laser, and then the laser can be reflected to the light homogenizing component through the cambered surface light reflecting structure. The diffuse reflection component has a good light mixing effect on the incident laser, so that the light mixing uniformity of the laser emitted by the multicolor light source can be improved, and the projection effect of the projection equipment where the multicolor light source is located is improved.

In this embodiment, the laser light emitted by the laser 101 may be emitted to the whole area of the diffuse reflection component 103, or may be emitted to only a partial area of the diffuse reflection component 103, which is not limited in this embodiment. In the embodiment of the present application, a region irradiated with laser light in the diffuse reflection member 103 is referred to as a laser irradiation region. For example, with continued reference to fig. 2, the diffuse reflection component 103 may be a plate-shaped structure that is fixed in position and does not move, and a diffuse reflector or a diffuse reflection film is disposed on a side of the plate-shaped structure close to the curved reflecting structure 102. If the plate-shaped structure may be rectangular, circular or other shapes, the embodiments of the present application are not limited. The laser light emitted from the laser 101 can be emitted to the fixed area of the side of the diffuse reflection component 103 close to the cambered surface light reflecting structure 102.

By way of further example, fig. 3 is a schematic structural diagram of another multicolor light source provided in an embodiment of the present application. Fig. 4 is a schematic structural diagram of a diffuse reflection component according to an embodiment of the present application, and fig. 4 is a top view of the diffuse reflector in fig. 3. Referring to fig. 3 and 4, the diffuse reflection member 103 may have a circular ring shape. The diffuse reflection member 103 may rotate around a rotation axis Z, which may be parallel to a target direction (e.g., x direction), which may be located at a center of the circular ring. The diffuse reflection member 103 may rotate in a clockwise direction, or in a counterclockwise direction, or may alternatively rotate in the clockwise direction and the counterclockwise direction about the rotation axis Z. As the diffuse reflection member 103 rotates about the rotation axis Z, different areas of the diffuse reflection member 103 receive the irradiation of the laser light emitted from the laser 101, so that the laser irradiation area of the diffuse reflection member 103 continuously changes as the diffuse reflection member 103 rotates. The diffuse reflection member generates heat due to energy accumulation during continuous irradiation of the laser beam, and the diffuse reflection member is likely to be damaged due to a change in the diffuse reflection effect of the light beam when the temperature is too high. Make diffuse reflection part revolute rotation of axes in this application embodiment to guarantee that diffuse reflection part's same position receives laser continuous irradiation's time shorter, avoid the heat of each position on the diffuse reflection part to gather, can prolong diffuse reflection part's life-span, and improve diffuse reflection part to the diffuse reflection effect of light.

It should be noted that whether the diffuse reflection member moves or not may be determined based on the power density of the laser light emitted from the laser. If the power density of the laser light emitted by the laser is greater than the density threshold, the laser light impinges on the diffuse reflection member, which causes heat to accumulate relatively quickly, and tends to adversely affect the performance of the diffuse reflection member. At this time, a moving diffuse reflection member, such as a rotatable diffuse reflection member shown in fig. 3, may be provided. If the power density of the laser light emitted from the laser is less than the density threshold, even if the laser light is continuously irradiated on the diffuse reflection member, the heat accumulation of the diffuse reflection member is slow, and the influence on the performance of the diffuse reflection member is small. A fixed diffuse reflective element, such as the one shown in fig. 2, may be provided at this time.

Alternatively, the arrangement positions of the diffuse reflection member 103 and the dodging member 104 may be determined based on the curved light-reflecting structure. Illustratively, the positions of the laser irradiation region of the diffuse reflection component 103 and the light incident region of the dodging component 104 satisfy the object image position relationship when the arc-shaped light reflection structure 102 forms an image, for example, the image formed by the arc-shaped light reflection structure 102 on the laser irradiation region of the diffuse reflection component 103 is located in the light incident region of the dodging component 104. The staff can determine the parameters of the cambered surface light reflecting structure, such as the size, the curvature, the shape and the like of the cambered surface; then, determining a group of object image positions meeting the imaging requirement of the cambered surface light reflecting structure based on the parameters of the cambered surface light reflecting structure; then, the positions of the diffuse reflection component and the dodging component are set based on the position of the object image, and the laser irradiation area of the diffuse reflection component and the light incoming area of the dodging component are respectively positioned at the position of the object image. Alternatively, after the cambered surface reflective structure is determined, a plurality of groups of object image positions where the cambered surface reflective structure can be imaged can be determined, and the positions of the laser irradiation region of the diffuse reflection component 103 and the light incident region of the dodging component 104 can be determined based on any one group of object image positions in the plurality of groups of object image positions. Alternatively, the positions of the laser irradiation region of the diffuse reflection member 103 and the light entrance region of the dodging member 104 may be determined based on one set of object image positions where the object is closest to the image among the plurality of sets of object image positions.

Optionally, with continued reference to fig. 2 and 3, the curved light reflecting structure 102 in the embodiment of the present application may be a hemispherical shell. Alternatively, the contoured light reflecting structure 102 may not be exactly hemispherical, and the contoured light reflecting structure 102 may also be spherical in shape. The spherical cap shape is a shape of a structure obtained by cutting a small part of a sphere with a plane. Optionally, the shape of the cambered surface light reflecting structure may also be other cambered surfaces different from the hemispherical shape and the spherical crown shape, and the embodiment of the present application is not limited. The curved reflective structure 102 may be a reflective bowl. Optionally, on the basis of the hemispherical shell, the cambered light reflecting structure 102 may further include an auxiliary light reflecting part continuously extending from the edge of the hemispherical shell.

Alternatively, with continued reference to fig. 2 and fig. 3, the laser irradiation region of the diffuse reflection component 103 and the light incident region of the dodging component 104 may be respectively located at two sides of the spherical center of the hemispherical shell. Such as the diffuse reflection part 103 and the light unifying part 104, may be respectively located at both sides of the spherical center of the hemispherical shell. With regard to the structure of the diffuse reflection member 103 shown in fig. 3, fig. 3 exemplifies that the rotation axis Z of the diffuse reflection member 103 and the dodging member 104 are located on different sides of the center of a sphere. Alternatively, the rotation axis may be located on the same side of the center of the sphere as the light uniformizing element 104, so long as the laser irradiation region of the diffuse reflection element 103 and the light incident region of the light uniformizing element 104 are located on different sides of the center of the sphere. Alternatively, if one of the diffuse reflection part 103 and the dodging part 104 is closer to the light-reflecting arc structure 102 than to a plane passing through the center of sphere and perpendicular to the target direction, the other may be farther from the light-reflecting arc structure 102. The distance that one approaches may not be equal to the distance that the other moves away, e.g., the distance that the other moves away may be two or three times the distance that the one approaches.

In an alternative implementation of the light-reflecting arc structure 102, the light-reflecting arc structure 102 may only include a structure with a curved surface, the side of the light-reflecting arc structure 102 away from the laser 101 is open, and the shape of the light-reflecting arc structure 102 is similar to an open bowl shape. The diffuse reflection part 103 and the dodging part 104 can be fixed at the opening of the cambered light reflecting structure 102 through fixing parts. In this optional manner, after the laser irradiates on the arc light reflecting structure 102, the arc light reflecting structure 102 does not include a closed space, and the contact area between the arc light reflecting structure 102 and the outside air is large, which can be beneficial to the heat dissipation of the arc light reflecting structure 102, and avoid the influence of the heat concentration in the arc light reflecting structure 102 on the arc light reflecting structure 102.

In an alternative implementation of the light-reflecting arc structure 102, the light-reflecting arc structure 102 may include a connected light-reflecting arc structure and a flat plate structure, and a side of the light-reflecting arc structure 102 away from the laser 101 may be shielded by the flat plate structure. In an alternative manner of the flat plate structure, the flat plate structure may have openings for the diffuse reflection member 103 and the light unifying member 104 to be disposed, and the diffuse reflection member 103 and the light unifying member 104 may be respectively embedded in the corresponding openings. In another alternative of the flat plate structure, the flat plate structure is made of a transparent material, and the flat plate structure completely covers the opening on the side of the cambered surface structure away from the laser 101. The diffuse reflection part 103 and the dodging part 104 can be both positioned on one side of the flat plate structure far away from the cambered surface structure; alternatively, one of the diffuse reflection part 103 and the dodging part 104 is located on the side of the flat plate structure away from the arc structure, and the other is located on the side of the flat plate structure close to the arc structure.

For the reflective regions in the curved reflective structure 103: in an alternative implementation manner, a reflective film may be attached to the curved reflective structure 103 to implement the function of reflecting the laser light by the curved reflective structure 103. In another optional implementation manner, the curved-surface light reflecting structure 103 may include a plurality of micro mirrors spliced into a shape similar to a curved surface, so as to implement the function of reflecting laser light by the curved-surface light reflecting structure 103 through the plurality of micro mirrors.

For transmissive regions in the curved reflective structure 103: in a first alternative implementation, the transmission region is a through hole of the cambered surface light reflecting structure. If the cambered surface light reflecting structure is a hemispherical shell with a through hole at the top, the through hole can cover the top of the hemispherical shell, namely the area where the vertex of the hemispherical shell is located. The laser light emitted from the laser 101 is directed through the through hole toward the diffuse reflection member 103. In a second alternative implementation, the transmissive region may comprise a transparent structure. Illustratively, the curved reflective structure includes an integrally reflective shell that is a reflective region of the curved reflective structure. The top of the shell is provided with a through hole, and a transparent structure is arranged at the through hole and is a transmission area of the cambered surface light reflecting structure. In another example, the whole cambered surface light reflecting structure is a transparent shell, a reflective film is attached to the cambered surface light reflecting structure, only a partial area of the top part is not attached with the reflective film, and the area not attached with the reflective film is a transmission area of the cambered surface light reflecting structure. The reflective film may be disposed on an inner surface or an outer surface of the transparent housing, and the embodiment of the present application is not limited thereto.

Optionally, when the second alternative implementation is adopted in the transmissive region, the top of the light-reflecting arc structure 103 is still in an arc shape, and the light-reflecting arc structure 103 may have a standard hemispherical shape or a spherical crown shape (such as the shape shown in fig. 3). When the first optional implementation manner is adopted in the transmission region, or the transparent structure is disposed at the through hole in the second optional implementation manner, the top of the curved-surface light reflecting structure 103 may not be arc-shaped, and the curved-surface light reflecting structure 103 is in a hemispherical shape or a spherical crown shape (such as the shape shown in fig. 2) with the top flattened.

Optionally, in the embodiment of the present application, the light uniformizing part 104 may be a wedge-shaped light pipe, a rectangular light pipe, or a fly-eye lens. The light guide pipe is provided with a light inlet and a light outlet, the light inlet area of the light guide pipe is the light inlet, and the light outlet area of the light guide pipe is the light outlet. The light incident area of the fly-eye lens is the surface of the fly-eye lens facing the cambered surface light reflecting structure 102, and the light emergent area of the fly-eye lens is the surface of the fly-eye lens departing from the cambered surface light reflecting section 120. It should be noted that the area of the light entrance of the wedge-shaped light guide is smaller than that of the light exit, and the area of the light entrance of the rectangular light guide is equal to that of the light exit. In fig. 2 of the present application, the light uniformizing part 104 is a wedge-shaped light pipe as an example, fig. 3 is a rectangular light uniformizing part 104 as an example, and any one of the above light uniformizing parts may be used in fig. 2 and 3, which is not limited in the embodiment of the present application.

In the embodiment of the present application, the incident angle of the laser emitted from the curved reflective structure 102 to the dodging member 104 is distributed in the range of 0 to 180 degrees. If the light uniformizing part 104 is a wedge-shaped light guide pipe, after the laser is reflected in the wedge-shaped light guide pipe for many times, the light outgoing angle range of the emitted laser can be shrunk to a certain extent, and the light spot of the emitted laser can be expanded to a certain extent. If the light homogenizing part 104 is a rectangular light guide pipe, after the laser is reflected in the rectangular light guide pipe for many times, the light-emitting angle range of the emitted laser and the formed light spot are not changed.

Fig. 5 is a schematic structural diagram of another multicolor light source provided by the embodiment of the present application. As shown in fig. 5, on the basis of fig. 2, the multicolor light source 10 may further include a converging lens 105, and the converging lens 105 is located between the laser 101 and the curved light reflecting structure 102. The laser 101 may emit laser light of multiple colors to the converging lens 105, and the converging lens 105 may converge the incident laser light to emit the laser light to the diffuse reflection component 103 through the transmission region of the curved reflective structure 102. For example, after the positions of the diffuse reflection part 103 and the dodging part 104 are determined based on the curved reflecting structure 102, the parameters of the converging lens 105 and the setting position of the converging lens 105 are determined based on the position of the diffuse reflection part 103, so as to ensure that the converging lens 105 can accurately converge the laser light emitted by the laser 101 to the diffuse reflection part 103.

Alternatively, the condensing lens 105 may be a convex lens or a semi-convex lens. Fig. 5 illustrates the converging lens 105 as a semi-convex lens, which has a flat surface and a convex curved surface, as shown in fig. 5, which may face the laser 101. Alternatively, the converging lens 105 may be fixed by a fixing member at a position between the laser 101 and the curved light reflecting structure 102. Alternatively, the transmission region of the curved reflective structure 102 is a through hole, and the converging lens 105 may be directly embedded in the through hole.

The laser 101 in the polychromatic light source 10 is described below. The laser 101 in the embodiment of the present application is a multi-color laser. The laser 101 may include a plurality of light emitting chips, and the plurality of light reflecting chips are respectively used for emitting laser light of different colors, so as to ensure that the laser 101 can emit laser light of a plurality of colors. Fig. 6 is a schematic layout diagram of light emitting chips in a laser according to an embodiment of the present disclosure. As shown in fig. 6, the laser 101 includes a first light emitting chip 1011 for emitting laser light of a first color, a second light emitting chip 1012 for emitting laser light of a second color, and a third light emitting chip 1013 for emitting laser light of a third color. The first color may be green, the second color may be blue, and the third color may be red. Optionally, the first color, the second color, and the third color in the laser may also be other colors, and the laser may also emit laser light of only two colors, or may also emit laser light of four colors, which is not limited in this embodiment of the present application.

For example, with continued reference to fig. 6, in the laser 101, the number of the first light emitting chips 1011 may be greater than or equal to the number of the second light emitting chips 1012, and the number of the third light emitting chips 1013 may be greater than the number of the first light emitting chips 1011, for example, the number of the third light emitting chips 1013 may be equal to the sum of the numbers of the first light emitting chips 1011 and the second light emitting chips 1012. It should be noted that the laser beams of multiple colors emitted by the laser device need to be mixed to obtain white light, and then a projection image is formed based on the white light. Since more red light components are required to obtain white light by mixing red light, green light and blue light, that is, more red light components are required to form a projection picture, the number of the third light emitting chips for emitting red laser light can be increased. The laser may include a plurality of light emitting chips arranged in an array, and each row of the plurality of light emitting chips is configured to emit laser light of the same color. Fig. 6 illustrates an example in which the laser includes 28 light emitting chips arranged in four rows and seven columns, and includes a row of first light emitting chips, a row of second light emitting chips, and two rows of third light emitting chips. Alternatively, the laser may also include 18 light emitting chips arranged in three rows and six columns, 20 light emitting chips arranged in four rows and five columns, or other numbers of light emitting chips arranged in other ways. The number of the light emitting chips for emitting laser light of different colors in the laser may also be different, for example, the number of the third light emitting chips may be greater than the number of the first light emitting chips, and the number of the first light emitting chips may be greater than the number of the second light emitting chips. Or the number of the light emitting chips for emitting the laser light of different colors may be the same, or the number of the light emitting chips may satisfy other relationships based on other color ratios required for forming the projection picture, which is not limited in the embodiment of the present application.

Alternatively, the respective light emitting chips in the laser may emit light simultaneously, or may emit light alternately. For example, the first light emitting chip, the second light emitting chip and the third light emitting chip in the laser may sequentially emit light in a cycle, and the laser emits laser light of only one color at the same time. Alternatively, the light emitting time lengths of each light emitting chip for each light emitting may be equal or different. For example, the light emitting duration of each light emitting chip may be determined according to a ratio of the corresponding color of the light emitting chip when the projection screen is formed. If more red laser light is required to form the projection screen, the emission time of the red laser light can be made longer. Optionally, in this case, the number of light emitting chips in the laser for emitting the laser light of each color may be equal, or the number of light emitting chips corresponding to the laser light with more demand may also be less than the number of other light emitting chips, and the amount of the emitted laser light is controlled by increasing the light emitting duration of the laser light.

Optionally, the laser in the multicolor light source in the embodiment of the present application may also include a plurality of monochromatic lasers for emitting laser light of different colors. For example, the multicolor light source includes a first laser for emitting laser light of a first color, a second laser for emitting laser light of a second color, and a third laser for emitting laser light of a third color. The three lasers each emit laser light toward the condenser lens. Optionally, the three lasers may emit light directly to the converging lens, or reflectors may be provided, so that the lasers emit laser light to the corresponding reflectors, the incident laser light is reflected to the converging lens by the reflectors, and the incident laser light is converged to the diffuse reflection component by the converging lens.

Optionally, with continued reference to fig. 2, fig. 3, or fig. 5, the laser 101 may further include a collimating lens group, which may include a plurality of collimating lenses T. Each collimating lens T may correspond to one light emitting chip in the laser 101, and the laser light emitted by each light emitting chip is emitted to the corresponding collimating lens T, and is then emitted after being collimated by the collimating lens T, so that the light emission of the laser is completed.

Optionally, a half-wave plate may be further disposed on the light exit side of the laser in this embodiment, so that the blue laser light and the green laser light emitted by the laser pass through the half-wave plate and are directed to the converging lens. The polarization direction of the laser can be turned by 90 degrees by the half-wave plate, the blue laser and the green laser emitted by the laser are S-polarized light, the red laser is P-polarized light, and the polarization direction of the S-polarized light is perpendicular to that of the P-polarized light. Therefore, the blue laser and the green laser can be changed into P polarized light after passing through the half-wave plate, and then the polarization directions of the blue laser, the green laser and the red laser which are emitted to the convergent lens are the same and are all P polarized light, so that the light mixing effect of the lasers with different colors emitted by the laser can be further improved. And the laser with uniform polarization direction is adopted to form the projection picture, so that the problem that color blocks exist in the formed projection picture due to different transmission and reflection efficiencies of the optical lens to different polarized light can be avoided, and the display effect of the projection picture is improved.

To sum up, in the multicolor light source provided by the embodiment of the application, the laser can emit laser to the diffuse reflection component, the diffuse reflection component performs diffuse reflection on the laser, and then the laser can be reflected to the light homogenizing component through the cambered surface light reflecting structure. The diffuse reflection component has a good light mixing effect on the incident laser, so that the light mixing uniformity of the laser emitted by the multicolor light source can be improved, and the projection effect of the projection equipment where the multicolor light source is located is improved.

Fig. 7 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application. As shown in fig. 7, the projection apparatus may further include a light valve 110 and a lens 111 on the basis of fig. 5. The dodging component 108 in the multicolor light source 10 may emit laser light to the light valve 110, the light valve 110 may modulate the emitted laser light and emit the modulated laser light to the lens 111, and the lens 111 may project the emitted laser light to form a projection image.

For example, the light valve 110 may include a plurality of reflective sheets, each of which may be used to form a pixel in the projection image, and the light valve 110 may reflect the laser light to the lens 111 according to the image to be displayed, so as to modulate the light, where the reflective sheet corresponding to the pixel that needs to be displayed in a bright state. Lens 111 may include a plurality of lenses (not shown), and for the arrangement of the structures in the projection device shown in fig. 7, the lenses in lens 111 may be arranged in sequence in a direction perpendicular to the paper surface. The laser emitted from the light valve 110 may sequentially pass through a plurality of lenses in the lens 111 to be emitted to the screen, so as to realize the projection of the laser by the lens 111 and realize the display of the projection picture.

Optionally, with continuing reference to fig. 7, the projection apparatus may further include an illumination mirror group 112 located between the light uniformizing element 108 and the light valve 110, and the laser light homogenized by the light uniformizing element 108 may be emitted to the light valve 110 through the illumination mirror group 112. The illumination mirror assembly 112 may include a reflector F, a lens T, and a Total Internal Reflection (TIR) prism L. The laser light emitted from the light homogenizing member 108 may be emitted to the reflective sheet F, the reflective sheet F may reflect the emitted light to the convex lens H, the convex lens H may converge the emitted laser light to the tir prism L, and the tir prism L reflects the emitted laser light to the light valve 110.

To sum up, in the projection apparatus provided in the embodiment of the present application, the laser in the multicolor light source may emit laser to the diffuse reflection component, and the diffuse reflection component performs diffuse reflection on the laser, and then the laser may be reflected to the light homogenizing component through the arc-surface light reflecting structure. The diffuse reflection component has a good light mixing effect on the incident laser, so that the light mixing uniformity of the laser emitted by the multicolor light source can be improved, and the projection effect of the projection equipment where the multicolor light source is located is improved.

The term "at least one of a and B" in this application may denote: a exists alone, B exists alone, and A and B exist at the same time. "at least one of A, B and C" means that there may be seven relationships that may mean: seven cases of A alone, B alone, C alone, A and B together, A and C together, C and B together, and A, B and C together exist. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

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