CN115128894B - Projection light source and projection device - Google Patents
Projection light source and projection device Download PDFInfo
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- CN115128894B CN115128894B CN202210910007.1A CN202210910007A CN115128894B CN 115128894 B CN115128894 B CN 115128894B CN 202210910007 A CN202210910007 A CN 202210910007A CN 115128894 B CN115128894 B CN 115128894B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
Abstract
The application discloses a projection light source and projection equipment, wherein a light emitting area of a laser in the projection light source comprises a first light emitting area, a second light emitting area and a third light emitting area which are used for emitting lasers with different colors in a third direction, the first light emitting area, the second light emitting area and the third light emitting area are arranged along the first direction, and the second light emitting area and the third light emitting area are arranged along the second direction; the dimming structure is used for adjusting the position of part of laser in the light emergent region in the second direction and emergent along the third direction; the light combination structure is used for adjusting the laser emitted by the first light emitting area, the laser emitted by the second light emitting area and the laser emitted by the third light emitting area to the same side and emitting the laser along the third direction. The application can ensure that the projection light source can meet the light combination requirement, has compact structure and is beneficial to miniaturization.
Description
Technical Field
The present application relates to the field of photoelectric technology, and in particular, to a projection light source and a projection device.
Background
With the development of photoelectric technology, laser is widely used as a light source of a projection device, and the higher the symmetry of laser light of various colors emitted by the projection light source is, the better the mixing effect is, and the better the display effect of a projection picture is.
Fig. 1 is a schematic structural diagram of a projection light source and a schematic diagram of a spot formed by laser emitted by the projection light source according to the related art. As shown in fig. 1 (a), the projection light source 00 includes a laser 01 and a light combining lens group 02. The laser 00 may include two columns of light emitting chips, one for emitting red laser light, and some of the light emitting chips in the other for emitting green laser light, and the rest for emitting blue laser light. The light combining lens set 02 may include two light combining lenses, where each light combining lens is located on a light emitting side of a row of light emitting chips, and is configured to emit laser light emitted by the row of light emitting chips along the z direction along the x direction, so as to mix laser light of various colors emitted by the laser 01, and at this time, the direction in which the laser light is emitted by the light emitting chips is different from the direction in which the laser light is emitted by the projection light source.
As can be seen from fig. 1 (b), the symmetry of the laser light of each color emitted from the projection light source in the related art is poor. Because the position of the light emitting chip and the emitted color of the laser 01 are fixed, in order to improve the light spot symmetrical effect formed by the projection light source, a reflecting mirror can be added in the light path of the projection light source to adjust the positions of lasers with different colors, and then light combination is carried out, so that the lasers with various colors emitted by the final projection light source achieve better mixing effect. However, this causes an increase in the number of optical lenses in the projection light source, which is disadvantageous in downsizing the projection light source.
Disclosure of Invention
The invention provides a projection light source and projection equipment, which can achieve the mixing effect of the projection light source and ensure miniaturization. The technical scheme comprises the following steps:
in one aspect, there is provided a projection light source comprising: the device comprises a laser, a dimming structure and a light combining structure; the light emergent region of the laser comprises a first light emergent region, a second light emergent region and a third light emergent region which are used for emitting lasers with different colors in a third direction, wherein the first light emergent region, the second light emergent region and the third light emergent region are arranged along a first direction, the second light emergent region and the third light emergent region are arranged along a second direction, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction respectively; part of laser emitted by the first light emitting area and the second light emitting area is reflected to the other side of the light adjusting structure along the second direction in the light adjusting structure, and is reflected by the other side of the light adjusting structure and then emitted to the light combining structure along the third direction; the rest laser of the light emitting area is transmitted by the light adjusting structure and then emitted to the light combining structure along a third direction; the laser of the first light emitting area is emitted along a third direction after being transmitted by the light combining structure, the laser of the second light emitting area and the laser of the third light emitting area are reflected to the other side of the light combining structure along the first direction in the light combining structure, and the laser is emitted along the third direction after being reflected by the other side of the light combining structure.
In another aspect, a projection device is provided, the projection device including the projection light source, an illumination system, and a lens; the projection light source is used for emitting laser to the illumination system along a third direction, the illumination system is used for emitting the emitted laser to the lens, and the lens is used for projecting the emitted laser to form a projection picture.
The technical scheme provided by the application has the beneficial effects that at least: the position of part of laser emitted by the laser can be adjusted in the second direction by arranging the dimming structure in the projection light source, so that light spots with uneven color distribution formed by emitting light in light emitting areas with different colors are adjusted to light spots with even color distribution, and the laser emitted by the three light emitting areas is adjusted to be emitted from the same side along the third direction by the light combining structure, so that the uniformity and symmetry of the combined laser are ensured. The projection light source can realize light combination through the light adjusting structure and the light combining structure, the number of optical lenses is reduced, the structure is compact, the size of the projection light source is smaller, and therefore the miniaturization of projection equipment is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a projection light source and a schematic diagram of a spot formed by laser emitted by the projection light source according to the related art;
FIG. 2 is a schematic diagram of a projection light source according to an embodiment of the present application;
FIG. 3 is a schematic view of a projection light source according to another embodiment of the present application; FIG. 4 is a schematic diagram of the laser light passing dimming structure of FIG. 3;
FIG. 5 is a schematic view of the laser beam passing through the light combining structure in FIG. 3;
FIG. 6 is a schematic diagram of an output region of a laser according to an embodiment of the present application;
FIG. 7 is a top view of a projection light source provided by an embodiment of the present application;
FIG. 8 is a schematic diagram of a spot formed by laser light emitted by a laser according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a spot formed by a laser directed to a dodging structure according to an embodiment of the present application;
FIG. 10 is a schematic diagram of a spot formed by a projection light source emitting laser light according to an embodiment of the present application;
fig. 11 is a schematic diagram of a dimming structure and a dodging structure according to an embodiment of the present application;
fig. 12 is a schematic view of a light combining structure according to an embodiment of the present application;
FIG. 13 is a schematic view of another projection light source provided by an embodiment of the present application;
FIG. 14 is a schematic view of a portion of the structure of the projection light source provided in FIG. 13;
FIG. 15 is a schematic view of a portion of the structure of the projection light source provided in FIG. 13;
FIG. 16 is a schematic diagram of a projection apparatus according to an embodiment of the present application;
FIG. 17 is a schematic diagram of another projection apparatus according to an embodiment of the present application;
reference numerals:
1-a projection device;
10-a projection light source, 101-a laser, Q1-a first light emitting region, Q11-a first sub-region, Q2-a second light emitting region, Q21-a second sub-region and Q3-a third light emitting region;
102-dimming structure 1021-first side 1022-second side;
103-a light combining structure, 1031-a first light combining surface, 1032-a second light combining surface;
104-light homogenizing structure, 105-diffusion sheet and 106-diffusion wheel;
11-illumination system, 111-fly-eye lens, 112-light pipe, 113-light valve;
12-lens.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a further description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present application are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present application. The drawings of the present application are merely schematic representations of relative positional relationships and are not intended to represent true proportions.
With the development of photoelectric technology, laser is widely used as a light source of a projection device, and the higher the symmetry of laser light of various colors emitted by the projection light source is, the higher the contact ratio and the uniformity of mixed light are, the better the display effect of a projection picture formed based on the laser is. In the related art, after the laser in the projection light source is emitted through the light converging lens group, the laser is homogenized through the light homogenizing component and then the subsequent picture projection is performed. The closer the incidence angle of the laser light on the light homogenizing member is, the closer the homogenizing effect of the light homogenizing member on the laser light is. The distribution position of the light spots can reflect the incidence angle of the light spots on the light homogenizing component, and the incidence angle is larger when the light spots are closer to the two ends and smaller when the light spots are closer to the center. The light spots formed by the laser on the light homogenizing component are similar to those shown in fig. 2, and as the incidence angles of the red laser, the green laser and the blue laser on the light homogenizing component are large in difference, the homogenizing effect of the light homogenizing component on the lasers with different colors is large in difference, and the display effect of a projection picture formed based on the lasers is poor.
The embodiment of the application provides a projection light source and projection equipment, wherein the symmetry of laser light with various colors emitted by the projection light source is higher, the light mixing effect is better, and a projection picture with better display effect can be formed.
Fig. 2 is a schematic structural diagram of a projection light source according to an embodiment of the present application. The projection light source comprises a laser 101, a dimming structure 102 and a light combining structure 103; the light emergent region of the laser comprises a first light emergent region Q1, a second light emergent region Q2 and a third light emergent region Q3 for emitting lasers with different colors in a third direction, the first light emergent region Q1, the second light emergent region Q2 and the third light emergent region Q3 are arranged along a first direction (y direction in the figure), the second light emergent region Q2 and the third light emergent region Q3 are arranged along a second direction (x direction in the figure), the first direction is perpendicular to the second direction, and the third direction (z direction in the figure) is perpendicular to the first direction and the second direction respectively; part of the laser emitted from the first light emitting region Q1 and the second light emitting region Q2 is reflected to the other side of the light modulating structure 102 along the second direction in the light modulating structure 102, and is reflected by the other side of the light modulating structure 102 and then emitted to the light combining structure 103 along the third direction; the rest laser of the light emergent region is transmitted by the dimming structure 102 and then exits to the light combining structure 103 along the third direction; the laser light of the first light emitting region Q1 is transmitted through the light combining structure 103 and then emitted along the third direction, and the laser light of the second light emitting region Q2 and the third light emitting region Q3 are reflected in the light combining structure 103 along the first direction to the other side of the light combining structure 103 and are reflected by the other side of the light combining structure 103 and then emitted along the third direction.
According to the projection light source provided by the application, laser emitted by the laser along the third direction is emitted along the third direction after sequentially passing through the dimming structure and the light combining structure, and laser rays in the projection light source do not generate turning of the direction; and the arrangement position of the light rays emitted from part of the light emitting areas of the laser in the second direction is changed after the light rays are adjusted by the light adjusting structure, so that the light spots emitted from the light emitting areas with different colors become light spots with uniform color distribution after being emitted by the light adjusting structure. The projection light source can realize that light is combined to form evenly distributed light spots through the light adjusting structure and the light combining structure, has compact structure and is beneficial to miniaturization of the projection light source.
Fig. 3 is a schematic structural diagram of another projection light source according to an embodiment of the present application.
The projection light source 10 may include: a laser 101, a dimming structure 102, a dodging structure 104 and a light combining structure 103. The laser light emitted from the laser 101 along the third direction sequentially passes through the dimming structure 102, the dodging structure 104 and the light combining structure 103 distributed on the light emitting side of the laser 101 along the third direction, and then is emitted from the third direction.
Fig. 6 is a schematic diagram of an optical output area of a laser according to an embodiment of the present application.
The laser 101 may include a first light emitting region Q1, a second light emitting region Q2, and a third light emitting region Q3, where each light emitting region is configured to emit laser light of one color, and the colors of the laser light emitted from the different light emitting regions are different. The second light emitting area Q2 and the third light emitting area Q3 are sequentially arranged along a second direction (such as a y direction), the first light emitting area Q1, the second light emitting area Q2 and the third light emitting area Q3 are sequentially arranged along a first direction (such as an x direction), the second light emitting area Q2 and the third light emitting area Q3 are located on the same side of the first light emitting area Q1 in the first direction, the second direction is perpendicular to the first direction, and the second direction and the first direction are perpendicular to the third direction. Alternatively, the first light emitting area Q1 may be rectangular. The second direction may be a longitudinal direction of the rectangle, and the first direction may be a width direction of the rectangle. The first light-emitting region Q1 may be positioned at the left side of the second and third light-emitting regions Q2 and Q3, or the first light-emitting region Q1 may be positioned at the right side of the second and third light-emitting regions Q2 and Q3. In the present application, the first light emitting region Q1 is disposed at the left side of the second light emitting region Q2 and the third light emitting region Q3.
Optionally, the three light emitting areas all include light emitting chips arranged along the second direction, where the number of light emitting chips in the second light emitting area Q2 and the number of light emitting chips in the third light emitting area Q3 are different, and the number of light emitting chips in the first light emitting area Q1 is not limited, so long as the distribution of the light emitting chips in the whole light emitting area can be satisfied and the light emitting chips are arranged symmetrically with the first direction as an axis.
The partial area of the end of the second light emitting area Q2 far away from the third light emitting area Q3 is a second sub-area Q21, the partial area of the first light emitting area Q1 at the end is a first sub-area Q11, and the first sub-area Q11 and the second sub-area Q21 are the partial areas of the first light emitting area Q1 and the second light emitting area Q2 at the same end respectively. Alternatively, the ends of the first sub-area Q11 and the second sub-area Q21 near the other light-emitting areas are aligned in the second direction, and the areas of the first sub-area Q11 and the second sub-area Q21 may be equal or unequal, which is not limited by the embodiment of the present application.
Fig. 8 is a schematic diagram of a spot formed by laser light emitted by a laser according to an embodiment of the present application. Fig. 9 is a schematic diagram of a spot formed by a laser directed to a dodging structure according to an embodiment of the present application. Fig. 10 is a schematic diagram of a spot formed by emitting laser by a projection light source according to an embodiment of the present application.
In the embodiment of the application, the first light emitting area Q1 includes 4 light emitting chips, the second light emitting area Q2 includes 2 light emitting chips, and the third light emitting area Q3 includes 3 light emitting chips. Each light emitting chip can emit a small beam of laser to form a small light spot, see fig. 8, so that the laser emitted from the first light emitting area Q1 can form 4 light spots G1, the second light emitting area Q2 forms 2 light spots G2, and the third light emitting area Q3 forms 3 light spots G3. Therefore, even if the distribution of all the light emitting chips in the whole light emitting area is axisymmetrically distributed in the first direction, the color distribution of the light spots emitted from the three light emitting areas is not uniform because the colors of the laser emitted from the three light emitting areas are different and the number of the light emitting chips contained in each light emitting area is different.
Optionally, the light spot of the second sub-area Q21 includes 1 light spot located at the edge in the second light emitting area Q2, or the light spot of the second sub-area Q21 includes a part of the 1 light spot located at the edge in the second light emitting area Q2, or the light spot of the second sub-area Q21 includes the 1 light spot located at the edge and a part of the adjacent light spot in the second light emitting area Q2; the light spot of the first sub-area Q11 may include 1 light spot located at the edge of the first light-emitting area Q1, or the light spot of the first sub-area Q11 may include a part of the 1 light spot located at the edge of the first light-emitting area Q1, or the light spot of the first sub-area Q11 may include the 1 light spot located at the edge and a part of the adjacent light spot in the first light-emitting area Q1. It should be noted that the choice of spot area affects the effect of a uniform distribution of spot color. In the embodiment of the present application, in order to achieve the best uniform distribution effect of the light spot colors, as shown in fig. 6, the light spot in the second sub-area Q21 includes 1 light spot located at the edge in the second light emitting area Q2, and the light spot in the first sub-area Q11 may include 1 light spot located at the edge in the first light emitting area Q1, or the light spot in the first sub-area Q11 may include a part of the light spots of 1 light spot located at the edge in the first light emitting area Q1.
Fig. 4 is a schematic diagram of a laser passing dimming structure in an embodiment of the present application.
Therefore, the dimming structure 102 is provided to adjust the light spots with uneven color distribution to light spots with even color distribution. Specifically, the front projection of the dimming structure 102 on the laser 101 covers the entire light emitting area, as shown in fig. 4, the dimming structure 102 can adjust the laser light emitted from the first sub-area Q11 and the second sub-area Q21 to be emitted from the side of the third light emitting area Q3 away from the second light emitting area Q2 to the light homogenizing structure 104. The laser light emitted from the remainder of the light emitting region except the first sub-region Q11 and the second sub-region Q21 may be directly emitted to the light homogenizing structure 104 through the light modulating structure 102. The light spots formed before the laser enters the dimming structure are shown in fig. 8, the light spots formed after the laser exits through the dimming structure are shown in fig. 9, that is, the dimming structure 102 can adjust the light spots of the first sub-area Q11 and the second sub-area Q21 to the other end of the whole light emergent area in the second direction, so that the color distribution of the light spots exiting from the three light emergent areas is axisymmetrically distributed in the first direction, and the light spots G2 are symmetrically distributed on two sides of the light spot G1 in fig. 9, thereby improving the uniformity of the color distribution of the light spots.
For convenience of description, the laser light emitted from the first light emitting region Q1 will be referred to as a first laser light, and the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 will be referred to as a second laser light and a third laser light, respectively. In the embodiment of the application, the first laser is red laser, and the second laser and the third laser are blue laser and green laser respectively. The dimming structure 102 includes a light incident surface, a first side surface 1021, a second side surface 1022, and a light emergent surface.
As an embodiment of the present application, the dimming structure 102 is a prism coated with a reflective film, the cross section of the prism in a plane formed by the second direction and the third direction is a parallelogram, the first side 1021 and the second side 1022 of the dimming structure 102 are two sides opposite to the parallelogram, the first side 1021 and the second side 1022 are sequentially distributed along the second direction, and the light incident surface and the light emergent surface of the dimming structure 102 are sequentially distributed along the third direction. The first side 1021 and the second side 1022 of the dimming structure 102 are both coated with reflective films, and the laser light emitted from the first sub-area Q11 and the second sub-area Q21 is incident to the first side 1021 through the light incident surface of the dimming structure 102, reflected to the second side 1022 through the first side 1021, then reflected to the light emergent surface through the second side 1022, and the laser light emitted from the remaining light emergent area is directly incident to the light emergent surface through the light incident surface of the dimming structure 102. The projection of the light incident surface on the laser 101 includes the entire light emergent region, and the projection of the first side 1021 on the laser 101 includes the first sub-region Q11 and the second sub-region Q21. Alternatively, the reflective film may be plated on the inner side of the dimming structure 102, for example, the first side 1021 is taken as an example, that is, the reflective film is located at one end of the first side 1021 near the second side 1022, so that after the laser light enters the dimming structure 102 through the light incident surface, the laser light can be directly reflected on the surface of the first side 1021, but this not only increases the manufacturing process, but also the reflective film is easy to fall off from the mirror surface, resulting in shortening the service life of the dimming structure 102; alternatively, the reflective film may be coated on the outer side of the dimming structure 102, that is, one end of the first side 1021 away from the second side 1022, where the processing procedure of the entire reflective film is simple, however, the first side 1021 may have two reflective surfaces, one is a prism surface of the first side 1021 near the second side 1022, and the other reflective surface is a coated surface of the first side 1021 away from the second side 1022, so that the incident laser light may be reflected multiple times on the two reflective surfaces of the first side 1021 to form multiple images, thereby affecting the imaging effect.
As another embodiment of the present application, the dimming structure 102 is a total reflection prism, the cross section of the prism in a plane formed by the second direction and the third direction is a parallelogram, the first side 1021 and the second side 1022 of the dimming structure 102 are two opposite sides of the parallelogram, the first side 1021 and the second side 1022 are sequentially distributed along the second direction, and the light incident surface and the light emergent surface of the dimming structure 102 are sequentially distributed along the third direction. The first side surface 1021 and the second side surface 1022 are total reflection surfaces, the laser beams emitted from the first sub-area Q11 and the second sub-area Q21 are incident through the light incident surface, are totally reflected on the first side surface 1021, then are incident on the second side surface 1022, are emitted to the light emergent surface through the second side surface 1022 in a secondary total reflection mode, and the laser beams emitted from other light emergent areas are directly emitted to the light emergent surface through the light incident surface of the light adjusting structure 102. In order to ensure that the incident laser beam can generate total reflection on both the first side 1021 and the second side 1022, an included angle between the first side 1021 and the incident surface is set to be θ1, a refractive angle between a prism of the light beam on the first side 1021 and an air interface is set to be θ2, a refractive index of the prism is set to be n1, and a refractive index of air is set to be n2, when the laser beam is perpendicularly incident on the incident surface, an incident angle of the laser beam on the first side 1021 is set to be θ1, if the laser beam is required to be totally reflected on the first side 1021, the refractive angle of the light beam is set to be 90 °, that is θ2=90 °, and the refractive index of air is set to be n2, and according to a refractive index formula, n1=n2×sθ2, when the refractive index of the light beam is required to be n1 is greater than or equal to 1/sθ1, the total reflection of the laser beam incident on the first sub-area Q11 and the second sub-area Q21 on the first side 1021 is ensured to be θ1, that is required to be equal to or equal to the total reflection on the first side 1021, and the refractive index of the prism is not equal to or equal to 1/1 on the first side 1021. In this embodiment, when the angle θ1=45° between the first side 1021 and the incident surface is perpendicular to the incident surface, the refractive index n1 of the prism needs to satisfy n1 being greater than or equal to 1.414, and by setting the total reflection prism, the exit positions of the laser light incident by the first sub-area Q11 and the second sub-area Q21 can be changed.
Fig. 7 is a top view of a projection light source according to an embodiment of the present application.
In the embodiment provided by the present application, referring to fig. 7, the length of the first side 1021 of the dimming structure 102 needs to ensure that the laser light emitted from the first sub-area Q11 and the second sub-area Q21 can be totally reflected, so that the front projection of the first side 1021 on the laser 101 needs to cover the first sub-area Q11 and the second sub-area Q21, so that the light spot formed by the laser light emitted from the first sub-area Q11 and the second sub-area Q21 can totally reach the first side 1021. However, the length of the first side 1021 may not be too long, which may result in that the front projection of the first side 1021 of the dimming structure 102 on the laser 101 covers other areas except the first sub-area Q11 and the second sub-area Q21, resulting in poor symmetry of the final light spot. The front projection of the dimming structure 102 on the laser 101 needs to cover the light emitting area of the whole laser 101, however, the length of the dimming structure 102 in the second direction may not be too large, otherwise, the distance between the first side 1021 and the second side 1022 is too large, so that the light spots of the first sub-area Q11 and the second sub-area Q21 are far away from other light spots after adjustment, which may affect the symmetry of the color of the light emitting light spot and affect the light combining effect. The length of the dimming structure 102 in the second direction and the third direction may not be too large, otherwise the size of the projection light source may be affected. Since the laser light emitted from the laser 101 is vertically incident on the incident surface of the dimming structure 102, the loss of the laser light in the prism is small.
In the embodiment of the present application, the main purpose of the first side 1021 and the second side 1022 of the dimming structure 102 is to adjust the light spots with asymmetric color distribution emitted from the second light emitting region Q2 and the third light emitting region Q3 to the light spots with symmetric color distribution, and preferably, the light spots are distributed with the first direction as the axis symmetry. Specifically, when the second light-emitting area Q2 includes 2 light-emitting chips and the first light-emitting area Q1 includes 4 light-emitting chips, the dimming structure 102 needs to ensure that the light spots emitted by the light-emitting chips on the side far away from the third light-emitting area Q3 in the second light-emitting area Q2 are adjusted to the side far away from the second light-emitting area Q2 of the third light-emitting area Q3, that is, the light-emitting chips of the second sub-area Q21 include 1 light-emitting chip located at the edge in the second light-emitting area Q2. At this time, the light spot of the first sub-area Q11 may include 1 light spot located at the edge of the first light-emitting area Q1, or the light spot of the first sub-area Q11 may include a part of the light spot of 1 light spot located at the edge of the first light-emitting area Q1, and since the light spot color emitted by the first light-emitting area Q1 is consistent, the light spot range included in the first sub-area Q11 does not affect the symmetry of the light spot of the first light-emitting area Q1 after the light spot passes through the dimming structure 102.
Since the dimming structure 102 partially adjusts the position of the spot, the position of the spot formed by the laser light emitted from the laser 101 is different from the position of the spot formed by the laser light emitted from the dimming structure 102 by the length of the first sub-region Q11 and the second sub-region Q21 along the second direction.
The light spot with uneven color distribution formed by the laser emitted by the laser 101 is adjusted to be a light spot with even color distribution after passing through the dimming structure 102, and the light spot needs to be further homogenized by the homogenizing structure 104, so that the energy distribution of the light spot is more uniform.
Specifically, the light homogenizing structure 104 may homogenize the incident laser light, and after passing through the homogenizing structure, the uniformity of energy distribution at each position in each laser light is improved, and the homogenized laser light may be directed to the light combining structure 103. Alternatively, the light homogenizing structure 104 may be a diffusion sheet 105 or a fly eye lens 111 or other structures with light homogenizing function. Alternatively, the light homogenizing structure may be a diffusion sheet, a single-sided fly-eye lens, or a double-sided fly-eye lens, which is not limited by the embodiment of the application.
Fig. 11 is a schematic diagram of a dimming structure and a dodging structure according to an embodiment of the present application.
As an embodiment of the present application, the light homogenizing structure 104 is a single-row fly-eye lens, the fly-eye lens has a light incident surface and a light emergent surface sequentially arranged along a third direction, the light incident surface of the fly-eye lens includes a plurality of convex cambered surfaces, or the light emergent surface of the fly-eye lens includes a plurality of convex cambered surfaces, and focal lengths of the light incident surface and the light emergent surface of the fly-eye lens are different, so that positions of the convex cambered surfaces influence positions of light spots emitted by the fly-eye lens, thereby influencing optical paths, but effects of homogenizing the light spots are not greatly different. In this embodiment, referring to fig. 11, when the light emitting surface of the fly-eye lens includes a plurality of convex cambered surfaces, the light adjusting structure 102 and the fly-eye lens may be sequentially disposed along a third direction, as in fig. 11 (a), a certain distance exists between the light adjusting structure 102 and the fly-eye lens, or the light emitting surface of the light adjusting structure 102 and the light entering surface of the fly-eye lens are attached to each other, the attaching manner may be gluing or other fixing manner, laser light directly enters the light entering surface of the fly-eye lens after exiting from the light emitting surface of the light adjusting structure 102, or, as in fig. 11 (b), the light adjusting structure 102 and the fly-eye lens are integrally formed, at this time, the integrally formed structure includes the light entering surface and the light exiting surface, the laser light emitted from the laser 101 enters through the light entering surface of the integrally formed structure, after partial laser adjustment is performed inside, the light exiting from the light exiting surface is a light spot with symmetric color and uniform energy distribution.
Fig. 5 is a schematic diagram of a laser passing through a light combining structure according to an embodiment of the present application. Fig. 12 is a schematic diagram of a light combining structure according to an embodiment of the present application.
The light combining structure 103 is used for combining three laser beams, specifically, the laser emitted from the first light emitting area Q1 passes through the light combining structure 103 and then directly emits along a third direction, the laser emitted from the second light emitting area Q2 and the third light emitting area Q3 is adjusted by the light combining structure 103 and then is combined with the laser emitted from the first light emitting area Q1 and coaxially emits along the third direction, so that the laser emitted from each light emitting area is mixed, and large light spots with uniform distribution are formed.
The light combining structure 103 includes a light incident surface, a light emergent surface, a first light combining surface 1031 and a second light combining surface 1032, where the light incident surface and the light emergent surface are sequentially arranged along a third direction, and the light incident surface is parallel to the light emergent surface, and the first light combining surface 1031 and the second light combining surface 1032 are arranged along the first direction.
As an embodiment of the present application, the light combining structure 103 may adjust the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 to one side of the first light emitting region Q1 for emitting, and the laser light emitted from the first light emitting region Q1 may directly emit through the light combining structure 103, so as to achieve beam combination of the first light emitting region Q1, the second light emitting region Q2 and the third light emitting region Q3, and the integrated light spot emits along the third direction. In the present embodiment, the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 is incident on the first light combining surface 1031 through the light incident surface, reflected to the second light combining surface 1032 through the first light combining surface 1031, reflected to the light emitting surface of the light combining structure 103 through the second light combining surface 1032, incident on the second light combining surface 1032 through the light incident surface, transmitted through the second light combining surface 1032, and emitted to the light emitting surface of the light combining structure 103, and further, the laser light emitted from the first light emitting region Q1, the second light emitting region Q2 and the third light emitting region Q3 is combined at the second light combining surface 1032 and emitted through the light emitting surface along the third direction.
As another embodiment of the present application, the light combining structure 103 may adjust the laser emitted from the first light emitting region Q1 to one side of the second light emitting region Q2 and one side of the third light emitting region Q3, and the laser emitted from the second light emitting region Q2 and the third light emitting region Q3 may directly emit through the light combining structure 103, so as to achieve the beam combination of the laser emitted from the three light emitting regions, and the combined laser emits along the third direction. In the present embodiment, the laser light emitted from the first light emitting region Q1 is incident on the first light combining surface 1031 through the light incident surface, reflected to the second light combining surface 1032 through the first light combining surface 1031, reflected to the light emitting surface of the light combining structure 103 at the second light combining surface 1032, and the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 is incident on the second light combining surface 1032 through the light incident surface, transmitted through the second light combining surface 1032 and emitted to the light emitting surface of the light combining structure 103, and further, the laser light emitted from the first light emitting region Q1, the second light emitting region Q2 and the third light emitting region Q3 is combined at the second light combining surface 1032 and emitted through the light emitting surface along the third direction.
In the embodiment of the present application, the light combining structure 103 may be a light combining prism, the first light combining surface 1031 of the light combining structure 103 may be coated with a reflective film, or the first light combining surface 1031 of the light combining structure 103 may be coated with a layer of dichroic film capable of reflecting red laser light or blue and green laser light, or the first light combining surface 1031 of the light combining structure 103 is a total reflection surface, at this time, the refractive index of the light combining prism and the incident angle of the laser light on the first light combining surface 1031 satisfy the total reflection formula, and the calculation mode is consistent with that of the foregoing total reflection prism, which is not described herein. In the embodiment of the present application, in order to reduce the processing difficulty, the first light combining surface 1031 of the light combining structure 103 is a total reflection surface.
The first light combining surface 1031 of the light combining structure 103 is a total reflection surface, the second light combining surface 1032 of the light combining structure 103 is a dichroic surface, and when the light combining structure 103 adjusts the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 to one side of the first light emitting region Q1, the dichroic surface can transmit red laser light, and reflect blue laser light and green laser light. When the light combining structure 103 adjusts the laser light emitted from the first light emitting region Q1 to one side of the second light emitting region Q2 and one side of the third light emitting region Q3, the dichroic surface may reflect the red laser light, and transmit the blue laser light and the green laser light.
The final light spot arrangement schematic diagram is shown in fig. 10, and the light spots after the light spots are combined are symmetrically distributed, and it should be noted that fig. 10 is only a schematic diagram only for illustrating that the final combined light spot is a uniform light spot with symmetrically distributed color. In practice, since the divergence angle of the red laser is larger than that of the blue laser and the green laser, the range of the red light spot is the largest in the light spots formed by final beam combination, and the other two colors are included; because the divergence angle of the blue laser is larger than that of the green laser, and the blue laser can be symmetrically distributed on two sides of the green laser after passing through the dimming structure 102, the size of a blue light spot is larger than that of the green light spot in the light spot formed by final beam combination, and the blue light spot comprises the green light spot. That is, under the influence of the divergence angle of the laser and the arrangement of the chips, the laser emitted by the laser 101 is emitted along the third direction through the light spots formed after the light modulation structure 102, the light homogenizing structure 104 and the light combining structure 103, the area covered by the red light spots contains blue light spots and green light spots, and the area covered by the blue light spots contains green light spots.
Next, referring to fig. 7, the dimensions of the light combining structure 103 will be described, and the light combining structure 103 is used to adjust the laser beams emitted from the second light emitting region Q2 and the third light emitting region Q3 to one side of the first light emitting region Q1 for emitting, that is, the first light combining surface 1031 of the light combining structure 103 reflects the blue laser beam and the green laser beam, the second light combining surface 1032 transmits the red laser beam, and reflects the blue laser beam and the green laser beam. The orthographic projection of the light incident surface of the light combining structure 103 on the light homogenizing structure 104 covers the light emergent region of the whole light homogenizing structure 104, so that the laser can be totally incident to the light combining structure 103 after being homogenized by the light homogenizing structure 104. The length of the orthographic projection of the first light combining surface 1031 of the light combining structure 103 on the light incident surface along the first direction cannot be smaller than the length of the second light emitting region Q2 and the third light emitting region Q3 along the first direction, the length of the orthographic projection of the second light combining surface 1032 of the light combining structure 103 on the light incident surface along the first direction cannot be smaller than the length of the first light emitting region Q1 along the first direction, and thus, it can be ensured that the first light combining surface 1031 makes all the laser beams emitted by the second light emitting region Q2 and the third light emitting region Q3 reflect, and the second light combining surface 1032 makes all the laser beams emitted by the first light emitting region Q1 transmit. The length of the light combining structure 103 along the second direction and the third direction is not limited, as long as all light rays can pass through the light combining structure, but the length is not too large, otherwise, the size of the light combining structure 103 is large, which affects the size of the lens after the light combining structure 103. When the light combining structure 103 adjusts the laser emitted from the first light emitting region Q1 to emit from one side of the second light emitting region Q2 and one side of the third light emitting region Q3, the setting principle of the size of the light combining structure 103 is consistent with the above, and no further description is given here.
It should be noted that, the intersecting line of the second light combining surface 1032 and the light incident surface, and the intersecting line of the first light combining surface 1031 and the light emergent surface should be located between the first light emergent region Q1 and the second light emergent region Q2, and between the first light emergent region Q3, so that the second light combining surface 1032 transmits only the first laser light, the first light combining surface 1031 reflects only the second laser light and the third laser light, where the position of the first light emergent region Q1 refers to the position of the first light emergent region Q1 when reaching the light incident surface of the light combining structure 103, and the position descriptions of the second light emergent region Q2 and the third light emergent region Q3 are the same, which are not repeated here.
Fig. 12 is a schematic view of a light combining structure according to an embodiment of the present application.
Optionally, as shown in fig. 12 (b), the cross section of the light combining prism in the plane enclosed by the first direction and the third direction is a right trapezoid, the light incident surface and the light emergent surface of the light combining prism respectively correspond to two opposite sides of the right trapezoid along the third direction, and the first light combining surface 1031 of the light combining prism corresponds to the hypotenuse of the right trapezoid; alternatively, as shown in fig. 12 (a), the cross-sectional shape of the light combining prism in the plane enclosed by the first direction and the third direction is a parallelogram, the light incident surface and the light emergent surface of the light combining prism respectively correspond to two opposite sides of the parallelogram along the third direction, and the first light combining surface 1031 and the second light combining surface 1032 of the light combining prism respectively correspond to two opposite sides of the parallelogram along the first direction.
In the embodiment of the present application, the laser 101 may emit two kinds of lasers with different polarization directions, that is, the polarization direction of the laser emitted by the first light emitting region Q1 of the laser 101 is perpendicular to the polarization directions of the laser emitted by the second light emitting region Q2 and the third light emitting region Q3, while in the embodiment of the present application, the first light emitting region Q1 emits red laser, the second light emitting region Q2 emits blue laser, the third light emitting region Q3 emits green laser, the red laser is P polarized light, the blue laser and the green laser are S polarized light, and the polarization directions of the P polarized light and the S polarized light are perpendicular.
Since the propagation directions of the two polarized lights are different, in order not to affect the light combination, when the light combination structure 103 adjusts the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 to one side of the first light emitting region Q1, the second light combination surface 1032 of the light combination structure 103 is a polarization surface, which allows the P polarized light to transmit, and allows the S polarized light to reflect, the red laser light can transmit through the polarization surface, and the blue laser light and the green laser light reflect through the polarization surface. Specifically, the polarization plane may be implemented by plating a polarization film on the second light combining plane 1032, where the polarization film is a film having dichroism, allowing P polarized light to pass through and S polarized light to reflect. Alternatively, when the light combining structure 103 adjusts the laser light emitted from the first light emitting region Q1 to emit from one side of the second light emitting region Q2 and one side of the third light emitting region Q3, the polarization plane allows S polarized light to transmit and P polarized light to reflect. By setting the second light combining surface 1032 as the polarization surface, the lasers with different polarization directions can be combined at the position and emitted along the third direction, so that the beam combining effect of the lasers with different polarization directions is ensured, and the display effect of the projection picture is better.
Fig. 13 is a schematic view of another projection light source according to an embodiment of the present application.
In another embodiment of the present application, as shown in fig. 13, a projection light source and a projection device, the projection light source 10 may include: a laser 101, a dodging structure 104, a dimming structure 102 and a light combining structure 103. The laser light emitted from the laser 101 along the third direction sequentially passes through the light homogenizing structure 104, the light adjusting structure 102 and the light combining structure 103 which are distributed on the light emitting side of the laser 101 along the third direction, and then is emitted from the third direction.
In this embodiment, the light spot emitted from the laser 101 is homogenized by the light homogenizing structure 104 and then reaches the light modulating structure 102, and specific structures and dimensions of the light homogenizing structure 104 and the light modulating structure 102 are described above, which is not described herein.
Fig. 14 is a schematic view of a part of the structure of the projection light source in the present embodiment. Fig. 15 is a schematic view of a part of the structure of the projection light source in the present embodiment.
In this embodiment, as shown in fig. 15 (a), the dodging structure 104 may be disposed together with the dimming structure 102. Specifically, the light homogenizing structure 104 may be a single-row fly-eye projection, the light incident surface of the single-row fly-eye lens includes a plurality of convex cambered surfaces, the light emergent surface of the fly-eye lens is attached to or integrally arranged with the light incident surface of the light modulating structure 102, and the light emergent surface of the fly-eye lens is consistent with the light incident surface of the light modulating structure 102 in size.
In this embodiment, as shown in fig. 14 and fig. 15 (b), the light modulation structure 102 may be disposed together with the light combination structure 103, and at this time, the light emitting surface of the light modulation structure 102 and the light incident surface of the light combination structure 103 are attached or integrally disposed, and the light emitting surface of the light modulation structure 102 and the light incident surface of the light combination structure 103 are rectangular with identical dimensions, and it should be noted that at this time, the position of the convex arc surface of the light balancing structure 104 may be located on the light incident side of the light balancing structure 104, or may also be located on the light emitting side of the light balancing structure.
In this embodiment, as shown in fig. 15 (c), the light homogenizing structure 104, the light modulating structure 102 and the light combining structure 103 may be disposed together, where the light emitting surface of the light homogenizing structure 104 and the light incident surface of the light modulating structure 102 are attached to or integrally disposed, the light emitting surface of the light modulating structure 102 and the light incident surface of the light combining structure 103 are attached to or integrally disposed, the light emitting surface of the light homogenizing structure 104 and the light incident surface of the light modulating structure 102 are rectangular with identical dimensions, and the light emitting surface of the light modulating structure 102 and the light incident surface of the light combining structure 103 are rectangular with identical dimensions.
By combining and setting part of the structures in the projection light source 10, the light path can be shortened, the number of lenses in the projection light source is reduced, so that the size of the optical structure is reduced, the processing procedure is simpler, the miniaturization of the projection light source 10 is facilitated, and the size of projection equipment is reduced.
The projection light source 10 provided in the embodiment of the present application further includes at least one diffusion sheet 105, where the at least one diffusion sheet 105 is located on the light emitting side of the light combining structure 103, and fig. 16 illustrates that the at least one diffusion sheet 105 includes one diffusion sheet 105 as an example, and optionally, the at least one diffusion sheet 105 may also include two diffusion sheets 105, which is not illustrated in the embodiment of the present application.
Alternatively, the diffusion sheet 105 may diffuse the incident laser light more strongly in the fast axis than in the slow axis. Since the laser light may diverge in the fast axis less than in the slow axis as it is directed to the diffuser 105, the angle of divergence in the fast axis may be greater than 1 degree, for example, the angle of divergence in the slow axis may be less than 1 degree. In the embodiment of the application, the diffusion degree of the diffusion sheet 105 on the fast axis is stronger, so that the divergence angles of the laser on the fast axis and the slow axis after passing through the diffusion sheet 105 are closer, the aspect ratio of a light spot formed by the laser can be smaller, and the shape requirement of the laser emitted by the projection light source 10 can be met.
Alternatively, the diffusion sheet 105 may remain stationary or may be in motion. Such as the diffusion sheet 105 may translate within a target range, or rotate in a target direction, or flip within a target angular range. The diffusion sheet 105 may have a small range of positional movement when moving, so as to avoid moving outside the irradiation range of the laser light. The laser emitted from the diffusion sheet 105 may have a relatively random phase, and may reduce the speckle effect of the projection screen formed by the laser.
The embodiment of the application also provides projection equipment. The projection device 1 may comprise a projection light source 10, an illumination system 11 and a lens 12. The projection light source 10 may be any of the projection light sources described above.
Fig. 16 is a schematic structural diagram of a projection device according to an embodiment of the present application. FIG. 17 is a schematic diagram of another projection apparatus according to an embodiment of the present application;
as an embodiment of the present application, referring to fig. 16, the illumination system 11 includes a fly-eye lens 111, at the light outlet of the projection light source 10, at least one diffusion sheet 105 is included, and the diffusion sheet 105 may be a moving diffusion sheet 105, and is used for performing light-homogenizing and speckle-dissipating treatment on the combined light beam emitted from the combining structure 103, and the light beam emitted from the projection light source 10 is emitted from the diffusion sheet 105, then enters the fly-eye lens 111 of the illumination system 11 along a third direction, then exits to the light valve 113, and enters the lens 12 after being reflected by the light valve 113.
As another embodiment of the present application, referring to fig. 17, the illumination system 11 includes a light pipe 112, at the light outlet of the projection light source 10, a diffusion wheel 106 is included, the light beam emitted from the light combining structure 103 enters the diffusion wheel 106, is homogenized by the diffusion wheel 106 and then enters the light pipe 112 of the illumination system 11 along a third direction, and since the incident surface of the light pipe 112 is smaller, a converging lens is required to be disposed to converge the light spot into the light pipe 112, and the converging lens is located between the light combining structure 103 and the diffusion wheel 106, and is used for focusing the light beam onto the diffusion wheel 106, and the light beam is homogenized by the light pipe 112 and then emitted to the light valve 113, and then reflected by the light valve 113 and enters the lens 12.
In summary, in the projection light source and the projection device provided by the embodiments of the present application, the dimming structure in the projection light source may adjust the laser emitted from the first sub-region at one end of the first light emitting region and the laser emitted from the second sub-region at the same end of the second light emitting region to a side away from the second light emitting region from the third light emitting region, so that the light spots with asymmetric color distribution formed due to different colors of the laser emitted from the three light emitting regions are adjusted to symmetrical light spots after passing through the dimming structure, and the laser emitted from the dimming structure is incident to the light combining structure. In this way, the laser of the second light emitting region can be respectively positioned at two sides of the laser emitted by the third light emitting region when the laser irradiates the light combining structure, so that the symmetry of the laser of different colors emitted by the second light emitting region and the third light emitting region is improved. The light combining structure can adjust the light spots emitted by the first light emitting area, the second light emitting area and the third light emitting area to the same side, so that the combined beam is emitted along the third direction. Thus, the light combining structure combines the laser beams emitted by the laser and does not change the emitting direction of the laser. And the laser emitted by the laser can be homogenized through a light homogenizing structure, so that the uniformity of the laser can be ensured to be higher. Therefore, the projection light source can form light spots with good mixing effect through the light modulation structure and the light combination structure, and the number of optical lenses is reduced; and the direction of the light rays emitted by the laser is consistent with the direction of the light rays emitted by the projection light source, so that the space layout of the lens in the projection light source is simple and compact, and the miniaturization of the projection light source is facilitated.
And because the optical structure of projection light source all sets up along the third direction to make the direction that closes light beam emergence through setting up the light structure and the direction that the laser instrument was emergent unanimous, the laser that the laser instrument was emergent is along third direction emergence to the light structure that closes promptly, also follow the third direction and export to lighting system after closing the light structure to close the beam, make projection light source and lighting system can arrange along the third direction and set up, thereby when can making projection light source and lighting system carry out integrated design, be favorable to projection equipment miniaturization, and projection light source and lighting system spatial layout are approximately in a straight line along the third direction, be favorable to the arrangement of other devices of projection equipment, thereby make projection equipment's space utilization promote.
The foregoing description of the embodiments of the application is merely illustrative of the present application and is not intended to limit the embodiments of the application, but any modifications, equivalents, improvements or the like falling within the spirit and principles of the embodiments of the application are intended to be included within the scope of the embodiments of the application.
Claims (10)
1. A projection light source, the projection light source comprising: the device comprises a laser, a dimming structure and a light combining structure;
the light emergent region of the laser comprises a first light emergent region, a second light emergent region and a third light emergent region which are used for emitting lasers with different colors in a third direction, wherein the first light emergent region, the second light emergent region and the third light emergent region are arranged along a first direction, the second light emergent region and the third light emergent region are arranged along a second direction, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction respectively;
Part of laser emitted by the first light emitting area and the second light emitting area is reflected to the other side of the light adjusting structure along the second direction in the light adjusting structure, and is reflected by the other side of the light adjusting structure and then emitted to the light combining structure along the third direction; the rest laser of the light emitting area is transmitted by the light adjusting structure and then emitted to the light combining structure along a third direction;
the laser of the first light emitting area is emitted along a third direction after being transmitted by the light combining structure, the laser of the second light emitting area and the laser of the third light emitting area are reflected to the other side of the light combining structure along the first direction in the light combining structure, and the laser is emitted along the third direction after being reflected by the other side of the light combining structure.
2. The projection light source of claim 1, wherein a partial region of the second light-exiting region away from the third light-exiting region is a second sub-region, and a partial region of the first light-exiting region is a first sub-region, the first sub-region and the second sub-region being arranged along the first direction;
the dimming structure comprises a first side surface and a second side surface which are arranged along the second direction;
the laser emitted from the first sub-zone and the second sub-zone is incident to the dimming structure along the third direction, reflected by the first side surface and then incident to the second side surface along the second direction, and the second side surface is used for reflecting the incident laser along the third direction.
3. The projection light source of claim 2, wherein the laser light emitted from the first and second sub-regions is totally reflected at both the first and second sides.
4. The projection light source of claim 1, wherein the light combining structure comprises a first light combining surface and a second light combining surface disposed along the first direction;
the laser emitted from the second light emitting area and the third light emitting area is incident to the light combining structure along a third direction, reflected by the first light combining surface and then incident to the second light combining surface along the first direction;
the laser emitted from the first light emitting area enters the light combining structure along a third direction, is transmitted through the second light combining surface and then is emitted along the third direction;
the second light combining surface is further used for reflecting laser emitted by the second light emitting area and the third light emitting area along the third direction.
5. The projection light source of claim 4, wherein the laser light emitted from the second light emitting region and the third light emitting region is totally reflected on the first light combining surface.
6. The projection light source of claim 4, wherein the polarization direction of the laser light emitted by the first light extraction region is perpendicular to the polarization directions of the laser light emitted by the second light extraction region and the third light extraction region;
The second light combining surface is plated with a polarizing film, and the polarizing film is used for transmitting laser emitted by the first light emitting area and reflecting laser emitted by the second light emitting area and the third light emitting area.
7. The projection light source of any of claims 1-6, wherein the projection of the light combining structure onto the light modulating structure covers the light exit surface of the light modulating structure.
8. The projection light source of claim 7, further comprising a dodging structure, wherein the laser light emitted from the laser is transmitted through the dodging structure and exits along a third direction, and wherein the dodging structure is positioned between the laser and the dimming structure.
9. The projection light source of claim 7, further comprising a dodging structure, wherein the laser light emitted from the laser is transmitted through the dodging structure and then emitted in a third direction, and wherein the dodging structure is located between the light modulating structure and the light combining structure.
10. A projection device, the projection device comprising: the projection light source of any of claims 1-9, as well as an illumination system and a lens;
the projection light source is used for emitting laser to the illumination system along a third direction, the illumination system is used for emitting the emitted laser to the lens, and the lens is used for projecting the emitted laser to form a projection picture.
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| CN202311323097.5A CN117539117A (en) | 2022-07-29 | 2022-07-29 | Projection light source and projection device |
| CN202210910007.1A CN115128894B (en) | 2022-07-29 | 2022-07-29 | Projection light source and projection device |
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| CN101546045A (en) * | 2008-03-28 | 2009-09-30 | 红蝶科技(深圳)有限公司 | Polarization converter and projection system using same |
| CN101571664A (en) * | 2008-05-02 | 2009-11-04 | 精工爱普生株式会社 | Illumination apparatus, projector, and illumination method |
| CN102466953A (en) * | 2010-11-19 | 2012-05-23 | 宁波Gqy视讯股份有限公司 | Reflective projection equipment |
| CN105340140A (en) * | 2013-07-03 | 2016-02-17 | 浜松光子学株式会社 | Laser device |
| CN112540499A (en) * | 2019-09-20 | 2021-03-23 | 精工爱普生株式会社 | Projector with a light source |
| CN114326139A (en) * | 2020-09-30 | 2022-04-12 | 华为技术有限公司 | Speckle dissipation device, laser light source and projection equipment |
| CN114721159A (en) * | 2022-03-31 | 2022-07-08 | 青岛海信激光显示股份有限公司 | Projection light source |
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| Publication number | Publication date |
|---|---|
| CN117539117A (en) | 2024-02-09 |
| CN115128894A (en) | 2022-09-30 |
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