A laser light source device and a projection apparatus

Abstract

The application discloses a laser light source device and a projection device, comprising: a laser emitting three primary color lasers and a light combining prism located on the light emitting side of the laser. The light combining prism comprises a light combining surface and a plurality of connecting surfaces. Red laser, blue laser and green laser emitted by the laser are incident to the light combining surface of the light combining prism. The red laser is directly reflected by the light combining surface, while the blue laser and the green laser are incident to the inside of the light combining prism through the light combining surface, repeatedly reflected in the inside of the light combining prism, the optical path of the blue laser and the green laser is increased, and finally emitted at the position of the red laser incidence. Therefore, not only the three color lasers are combined, but also the difference between the divergence degree of the blue laser and the green laser after the optical path is increased and the divergence degree of the red laser is reduced, so that the difference between the combined light spot sizes of the three color lasers is reduced, and the uniformity of the combined light spot is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of projection technology, and in particular to a laser light source device and a projection device. BACKGROUND

[0002] With the development of display products towards large size, considering the power consumption, weight and size, the market of projection display products as large screen products to replace liquid crystal televisions and organic electroluminescent televisions is rapidly expanding.

[0003] Laser is used as a projection light source in the projection device, which gradually replaces mercury lamp illumination, and compared with Light Emitting Diode (LED) light source, laser is widely used due to the advantages of small optical expansion and high brightness. However, in order to ensure the miniaturization of the laser, multi-color laser chips are usually integrated in a row or a column, and among the multi-color laser chips, the divergence angle of red laser is large, and the divergence angles of blue laser and green laser are small. After the light combination, the spot sizes of the three-color lasers are greatly different, resulting in poor uniformity after the combination of the three-color lasers. SUMMARY

[0004] Embodiments of the present application provide a laser light source device, comprising:

[0005] a laser for emitting three primary color lasers; and

[0006] a light combination prism located on the light emitting side of the laser for light combining the three primary color lasers; the light combination prism comprises a light combination surface and a plurality of connecting surfaces;

[0007] wherein the red laser emitted by the laser is incident on the light combination surface and reflected by the light combination surface; the blue laser and the green laser emitted by the laser are incident on the light combination surface and transmitted into the light combination prism by the light combination surface; the incident position of the red laser incident between the plurality of connecting surfaces after multiple reflections is transmitted by the light combination surface, and the red laser is combined with the red laser.

[0008] In some embodiments of the present application, the light combination prism comprises three connecting surfaces, which are a first surface, a second surface and a third surface connected in sequence; the first surface and the third surface are further connected with the light combination surface, respectively;

[0009] the light combination surface is divided into a first region and a second region, the red laser and the blue laser are incident on the first region, and the green laser is incident on the second region; the first region is used for reflecting the red laser, transmitting the green laser and the blue laser, and the second region is used for transmitting the green laser and reflecting the blue laser;

[0010] The green laser is incident to the inside of the light combination prism through the second area of the light combination surface, and is incident to the first area of the light combination surface after multiple reflections between the first surface, the light combination surface and the third surface, and is emitted outwards.

[0011] The blue laser is incident to the inside of the light combination prism through the first area of the light combination surface, and is incident to the first area of the light combination surface after multiple reflections between the first surface, the second surface, the third surface and the light combination surface, and is emitted outwards.

[0012] In some embodiments of the present application, the light combination prism comprises three connecting surfaces, which are the first surface, the second surface and the third surface connected in sequence; the first surface and the third surface are also connected with the light combination surface respectively;

[0013] The light combination surface is divided into a first area and a second area, the red laser and the blue laser are incident to the first area, and the green laser is incident to the second area; the first area is used for reflecting the red laser, transmitting the green laser and the blue laser, and the second area is used for transmitting the incident laser;

[0014] The laser light source device further comprises:

[0015] A light splitting mirror is located between the laser and the second area; the light splitting mirror is used for transmitting the green laser and reflecting the blue laser;

[0016] The green laser is incident to the inside of the light combination prism through the second area of the light combination surface from the light splitting mirror, and is incident to the first area of the light combination surface after multiple reflections between the first surface, the light combination surface and the third surface, and is emitted outwards.

[0017] The blue laser is incident to the inside of the light combination prism through the first area of the light combination surface, and is incident to the first area of the light combination surface after multiple reflections between the first surface, the second surface, the third surface and the light combination surface, and is emitted outwards.

[0018] In some embodiments of the present application, the included angle between the first surface and the light combination surface is complementary to the included angle between the first surface and the second surface;

[0019] The width, thickness of the light combination prism and the distance between the laser and the light combination prism satisfy:

[0020]

[0021] Wherein, D represents the width of the light combining prism, H represents the thickness of the light combining prism; h1 represents the maximum distance when the green laser is incident on the light combining prism, h2 represents the minimum distance when the green laser is incident on the light combining prism, h3 represents the distance when the blue laser is incident on the light combining prism, and h4 represents the maximum distance when the red laser is incident on the light combining prism; γ represents the incident angle when the green laser is incident on the first surface, and β represents the incident angle when the blue laser is incident on the second surface.

[0022] In some embodiments of the present application, the light combining prism comprises two connecting surfaces, namely a first surface and a second surface; the first surface, the second surface and the light combining surface are sequentially connected;

[0023] The light combining surface is used for reflecting red laser, transmitting green laser and blue laser; the green laser and the blue laser are incident on the inside of the light combining prism through the light combining surface, and are incident on the light combining surface after multiple reflections between the first surface and the second surface, and are finally emitted outward.

[0024] In some embodiments of the present application, the light combining prism comprises two connecting surfaces, namely a first surface and a second surface; the first surface, the second surface and the light combining surface are sequentially connected;

[0025] The laser light source device further comprises:

[0026] A mirror is arranged close to the first surface and / or the second surface, and is spaced apart from the light combining prism by a set distance;

[0027] The green laser and the blue laser are incident on the inside of the light combining prism through the light combining surface, are emitted outward to the mirror through the first surface and / or the second surface, are reflected back to the inside of the light combining prism by the mirror, and are finally emitted outward through the light combining surface.

[0028] In some embodiments of the present application, the formula is defined as

[0029] In some embodiments of the present application, a light combining assembly is used to replace the light combining prism; the light combining assembly comprises:

[0030] A light combining mirror is arranged on the light emitting side of the laser; the light combining mirror is used for reflecting red laser, transmitting green laser and blue laser;

[0031] The mirror and the parallel plate are arranged at a set angle with respect to each other;

[0032] The parallel plate comprises a first surface and a second surface arranged opposite to each other; the first surface is used for reflecting green laser and transmitting blue laser, and the second surface is used for reflecting blue laser.

[0033] In some embodiments of the present application, the light combining surface is provided with a dichroic film or a polarization beam splitting film.

[0034] The embodiments of the present application also provide a projection device, comprising:

[0035] A projection light source, which is any of the laser light source devices mentioned above;

[0036] An illumination light path, which is located on the light exit side of the projection light source; the illumination light path comprises:

[0037] A diffusion element, which is located on the light exit side of the laser light source device, for diffusing and homogenizing the incident laser light;

[0038] An ommatidium lens group, which is located on the side of the diffusion element away from the laser light source device;

[0039] A shaping lens group, which is located on the light exit side of the ommatidium lens group;

[0040] A total reflection prism, which is located on the light exit side of the shaping lens group;

[0041] A display element, which is located on the light exit side of the illumination light path;

[0042] A lens, which is located on the side of the total reflection prism away from the display element.

[0043] The laser light source device and the projection device provided by the embodiments of the present application comprise a laser for emitting three primary color lasers and a light combining prism located on the light exit side of the laser. The light combining prism comprises a light combining surface and a plurality of connecting surfaces. The red laser, the blue laser and the green laser emitted by the laser are all incident to the light combining surface of the light combining prism. The red laser is directly reflected by the light combining surface, while the blue laser and the green laser are incident to the inside of the light combining prism through the light combining surface and repeatedly reflected in the inside of the light combining prism, increasing the optical path of the blue laser and the green laser, making the blue laser and the green laser further diverge, and finally being emitted at the position where the red laser is incident, so that the three color lasers are combined, and meanwhile the difference in the divergence degree of the blue laser and the green laser after the optical path is increased and the divergence degree of the red laser is reduced, thereby the difference in the size of the combined light spot of the three color lasers is reduced, and the uniformity of the combined light spot is improved. The light combining is performed through the light combining prism, and there is no mutual interference between the light combining components, so that the loss caused by the multiple passing of the laser through the light combining components can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings to be introduced below are only some of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0045] Figure 1 It is a structural schematic diagram of a laser;

[0046] Figure 2 It is a structural schematic diagram of a laser;

[0047] Figure 3 It is a structural schematic diagram of a laser;

[0048] Figure 4 It is a light combination schematic diagram of a laser in the related art;

[0049] Figure 5 It is a light combination schematic diagram of a laser light source device;

[0050] Figure 6 It is a light combination schematic diagram of a laser light source device;

[0051] Figure 7 It is a light combination schematic diagram of a laser light source device;

[0052] Figure 8 It is an equivalent optical path diagram of an optical path of a green laser in a light combination prism;

[0053] Figure 9 It is a light combination schematic diagram of a laser light source device;

[0054] Figure 10 It is a light combination schematic diagram of a laser light source device;

[0055] Figure 11 It is a light combination schematic diagram of a laser light source device;

[0056] Figure 12 It is a light combination schematic diagram of a laser light source device;

[0057] Figure 13 It is a light combination schematic diagram of a laser light source device;

[0058] Figure 14 It is a light combination schematic diagram of a laser light source device;

[0059] Figure 15 It is a structural schematic diagram of a projection device;

[0060] Figure 16 It is a structural schematic diagram of a projection device. Detailed Implementation

[0061] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the application will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction described in this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of this application are for illustrating relative positional relationships only and do not represent actual scale.

[0062] Projection display is a technology that uses planar image information to control a light source, and utilizes an optical system and projection space to magnify and display the image on a projection surface. With the development of projection display technology, projection displays are gradually being applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, and advertising and entertainment. Its advantages, such as large display size and clear display, also meet the requirements of large-screen displays.

[0063] Laser light sources offer advantages over other light sources, including a high color gamut and high brightness, leading to their increasingly widespread application in projection. Currently, mainstream lasers have evolved from monochromatic to tri-color lasers, integrating multiple color light sources into a single unit and achieving miniaturization.

[0064] Most current lasers use semiconductor lasers, with an appearance like... Figures 1-3 As shown, the laser includes a mounting substrate and a light-emitting module located on the mounting substrate. The mounting substrate has connection patterns and electrical connection areas for mounting the light-emitting module and realizing the electrical connection of the light-emitting device. The light-emitting module includes a housing, a cover plate, and optical components. The housing, cover plate, and mounting substrate form a sealed space, and the optical components are disposed on the cover plate. A laser chip and a reflective component are disposed inside the housing. The laser emitted from the laser chip is reflected towards the cover plate after incident on the reflective component, and then collimated by the optical components before being emitted again.

[0065] The light-emitting module can contain multiple laser chips, each emitting laser light with a different wavelength. For example, the laser chips may include a first laser chip x1, a second laser chip x2, and a third laser chip x3. Optionally, the first laser chip x1 emits red laser light, the second laser chip x2 emits blue laser light, and the third laser chip x3 emits green laser light, thereby enabling the laser to emit three primary colors of laser light and achieve full-color display. The laser chips are typically arranged according to a predetermined pattern. Figures 1-3Some arrangement rules of the laser chips are shown.

[0066] In some embodiments, as shown in Figure 1 , the first laser chips x1, the second laser chips x2 and the third laser chips x3 are arranged in one row, the second laser chips x2 are located between the first laser chips x1 and the third laser chips x3, the number of the first laser chips x1 and the third laser chips x3 is the same and greater than the number of the second laser chips x2.

[0067] In some embodiments, as shown in Figure 2 , the first laser chips x1, the second laser chips x2 and the third laser chips x3 are arranged in two rows, the first laser chips x1 are arranged in one row, and the second laser chips x2 and the third laser chips x3 are arranged in one row. The number of the first laser chips x1 is greater than the number of the second laser chips x2 and the number of the third laser chips x3.

[0068] In some embodiments, as shown in Figure 2 , the first laser chips x1, the second laser chips x2 and the third laser chips x3 are arranged in four rows, the first laser chips x1 are arranged in two rows, the second laser chips x2 are arranged in one row, and the third laser chips x3 are arranged in one row. The number of the first laser chips x1 is the sum of the number of the third laser chips x3 and the number of the second laser chips x2.

[0069] The laser beams of multiple colors emitted by the laser need to be combined before being used in the subsequent optical path, Figure 4 A common light combination method is shown. Take Figure 1 the laser shown in the figure as an example, the light emitting side of the laser 11 is provided with a light combination assembly 12, which includes a first light combination piece 121, a second light combination piece 122 and a third light combination piece 123. The green laser beams g1 and g2 emitted by the laser 11 are incident on the first light combination piece 121 and are reflected by the first light combination piece 121 to the second light combination piece 122. The blue laser beams b emitted by the laser 11 are incident on the second light combination piece 122, which transmits the green laser beams and reflects the blue laser beams, so as to combine the green laser beams and the blue laser beams. The red laser beams r1 and r2 emitted by the laser 11 are incident on the third light combination piece 123, which transmits the green laser beams and the blue laser beams and reflects the red laser beams, so as to combine the three-color laser beams.

[0070] As Figure 4 can be seen, since the second laser chips are located between the first laser chips and the third laser chips, the green laser beams r emitted by the third laser chips close to the second laser chips need to pass through the second light combination piece 122 twice. The laser is lost each time it passes through the light combination piece, thereby causing a large loss of green laser beams.

[0071] In addition, due to the limitations of semiconductor processes and materials, the divergence angle of red laser is greater than that of green laser and blue laser. In the current light combination mode, the spot sizes of the three-color lasers are quite different after light combination, resulting in poor uniformity of the combined light.

[0072] Therefore, the embodiment of the present application provides a laser light source device, which uses a light combination prism to combine light, increases the divergence of green laser and blue laser by increasing the optical path of green laser and blue laser, thereby reducing the spot size of the combined light of the three-color laser and improving the uniformity of the combined light spot.

[0073] As shown in Figure 5 , the laser light source device of the embodiment of the present application comprises a laser 11 and a light combination prism 10. The laser 11 is used to emit three primary color lasers. The light combination prism 10 is located on the light emitting side of the laser and is used to combine the three primary color lasers.

[0074] The following still takes the laser shown in Figure 1 as an example to combine light to specifically describe the structure of the light combination prism provided by the embodiment of the present application. However, it should be clear that when the type and / or structure of the laser to be combined changes, the parameters of the light combination prism need to be adjusted adaptively.

[0075] As shown in Figure 5 , the light combination prism 10 comprises a light combination surface 101 and a plurality of connecting surfaces 102. The red laser r1 and r2 emitted by the laser 11 is incident on the light combination surface 101 and is reflected by the light combination surface 101. The blue laser b and the green laser g1 and g2 emitted by the laser 11 are incident on the light combination surface 101 and are transmitted by the light combination surface 101 into the light combination prism. The red laser incident on the light combination surface 101 after multiple reflections between the plurality of connecting surfaces 102 is transmitted by the light combination surface 101 and combined with the red laser.

[0076] The laser emitted by the semiconductor laser chip usually has a fast axis and a slow axis, and the divergence angles of the laser beam along the fast axis and the slow axis are different. Without processing the laser beam, the divergence angle along the fast axis is greater than that along the slow axis. In order to reduce the divergence of the laser beam, a collimating lens is usually arranged at the light emitting position of the laser. The collimating lens is designed to collimate the fast axis direction of the laser beam, which makes the divergence angle of the laser beam in the slow axis direction greater than that in the fast axis direction after passing through the collimating lens.

[0077] The divergence angle of the red laser is greater than that of the green laser and the blue laser, and as the optical path increases, the divergence of the laser beam will be greater and greater. The present application utilizes the characteristics of the laser beam, so that the red laser r, the blue laser b and the green laser g emitted by the laser are all incident to the light combining surface 101 of the light combining prism. The red laser r is directly reflected by the light combining surface, while the blue laser b and the green laser g are incident to the inside of the light combining prism 10 through the light combining surface 101, and repeatedly reflected in the inside of the light combining prism, so as to increase the optical path of the blue laser b and the green laser g, make the blue laser b and the green laser g further diverge, and finally be emitted at the position where the red laser r is incident. Thus, not only the three-color laser is combined, but also the difference in divergence between the blue laser b and the green laser g after increasing the optical path and the divergence of the red laser r is reduced, so that the difference in size of the combined light spot of the three-color laser is reduced, and the uniformity of the combined light spot is improved. The light combining prism is used for light combining, and there is no mutual interference between the light combining components, so that the loss caused by the multiple passing of the laser through the light combining components can be avoided.

[0078] In some embodiments, as shown in Figure 6 The light combining prism 10 includes three connecting surfaces, i.e. the first surface 102a, the second surface 102b and the third surface 102c connected in sequence. The first surface 102a and the third surface 102c are also connected with the light combining surface 101 respectively, and the cross section of the light combining prism is trapezoidal.

[0079] As shown in Figure 6 The light combining surface 101 is divided into the first area 101a and the second area 101b. The red laser r1, r2 and the blue laser b are incident to the first area 101a, and the green laser g1, g2 are incident to the second area 101b. The first area 101a is used for introducing the blue laser g into the inside of the light combining prism, and finally combining the three-color laser. The first area 101a can reflect the red laser r1, r2, transmit the green laser g1, g2 and the blue laser b. The second area 101b is used for introducing the green laser into the inside of the light combining prism, and can transmit the green laser g1, g2 and reflect the blue laser b.

[0080] Specific light combination process is: red laser r1, r2 incident light combination surface of the first area 101a, by the first area 101 reflection. Green laser g1, g2 through light combination surface of the second area 101b incident to the inside of the light combination prism, in the first surface 102a, light combination surface 101 and the third surface 102c between multiple reflections incident to the first area 101a of light combination surface to the outside; Blue laser b through light combination surface of the first area 101a incident to the inside of the light combination prism, in the first surface, the second surface, the third surface and the light combination surface between multiple reflections incident to the first area 101a of light combination surface to the outside. Blue laser and green laser are finally emitted by the first area 101a to the outside, and the red laser is combined.

[0081] In specific implementation, the first surface 102a, the second surface 102b and the third surface 102c are provided with full waveband reflection film, which can reflect the incident light efficiently. As shown in Figure 6 As shown in the figure, green laser g1, g2 incident to the inside of the light combination prism, first incident to the first surface 102a, reflected by the first surface 102a to the light combination surface 101, by reasonably setting the angle between the first surface 102a and the light combination surface 101, the incident angle of green laser incident to the light combination surface 101 can be greater than the critical angle of total reflection of light on the light combination surface, so that the green laser is totally reflected by the light combination surface 101 to the third surface 102c, reflected by the third surface 102c to the first area 101a of the light combination surface, and transmitted from the first area 101a.

[0082] Blue laser b incident to the inside of the light combination prism, first incident to the second surface 102b, reflected by the second surface 102b to the second area 101b of the light combination surface, the second area 101b has the function of transmitting green laser and reflecting blue laser, and then reflects the blue laser to the first surface 102a, and then reflects the blue laser to the first surface 102a to the light combination surface 101, and then totally reflects the blue laser to the third surface 102c, and then reflects the blue laser to the first area 101a of the light combination surface, and then transmits from the first area 101a.

[0083] Blue laser has smaller divergence angle than green laser, and the reflection path of blue laser in the light combination prism is longer than that of green laser, so that the divergence degree of blue laser can be further increased, so that the divergence degree of three color laser is equivalent when finally emitted, and the uniformity of light combination spot is improved.

[0084] The first area 101a and the second area 101b of the light-combining surface can be provided with dichroic films to achieve the light-splitting effect. The dichroic film is designed by a film coating process to have different reflectivity / transmissivity for different wavebands of light. The first area 101a and the second area 101b need to be coated with films in different areas, wherein the dichroic film of the first area 101a reflects the red laser light waveband and transmits the blue laser light and the green laser light waveband; and the dichroic film of the second area 101b reflects the blue laser light waveband and transmits the green laser light waveband.

[0085] In some embodiments, as shown in Figure 7 The dichroic film on the second area 101b of the light-combining surface can also be separately provided as a light-splitting mirror 13 between the laser 11 and the second area 101b, and the dichroic film on the light-splitting mirror is used to transmit the green laser light and reflect the blue laser light.

[0086] The laser light emitted by the laser is polarized light, and the polarization directions of the red laser light, the blue laser light, and the green laser light are different. The red laser light is p-polarized light, and the blue laser light and the green laser light are s-polarized light. The polarization directions of the p-polarized light and the s-polarized light are perpendicular to each other.

[0087] The first area 101a of the light-combining surface can also be provided with a polarization light-splitting film to achieve the light-splitting effect. The polarization light-splitting film can transmit p-polarized light and reflect s-polarized light. A phase delay element (such as a half-wave plate) needs to be provided between the laser 11 and the light-combining prism 10 to rotate the polarization direction of the laser light emitted by the laser by 90 degrees, thereby converting the red laser light into s-polarized light and converting the green laser light and the blue laser light into p-polarized light. The red laser light converted into s-polarized light is reflected by the polarization light-splitting film of the first area 101a, while the blue laser light converted into p-polarized light is transmitted by the polarization light-splitting film of the first area 101a, thereby performing reciprocating reflection in the light-combining prism.

[0088] As shown in Figure 6 and Figure 7 To make the green laser light and the blue laser light perform reciprocating reflection in the light-combining prism and then be incident to the position where the red laser light is incident, so as to make the three-color laser light have a high degree of coincidence, the width D and the thickness H of the light-combining prism and the distance between the laser 11 and the light-combining prism 10 need to be limited.

[0089] Specifically, as shown in Figure 6As shown, the beam combining surface 101 of the beam combining prism 10 is set at a 45° angle to the plane of the laser 11, which makes it easier to control the direction of the combined beam. The beam combining prism 10 can be an axisymmetric structure, and the second surface 102b is set parallel to the beam combining surface 101. The angle between the first surface 102a and the beam combining surface is ω, and the sum of the angle between the first surface 102a and the second surface 102b is θ, which is ω + θ = 180°. When the two green laser beams g1 and g2, one blue laser beam b, and two red laser beams r1 and r2 emitted from the laser 11 are incident on the beam combining surface 101, the path lengths they travel are different, respectively. Figure 6 h1 to h5 in the example.

[0090] Since the beam combining surface 101 is set at an angle of 45° relative to the plane where the laser is located, the interval between two adjacent laser beams is equal to the difference between the distances of the two adjacent laser beams to the beam combining surface 101, which is h1-h2.

[0091] Figure 8 This is the equivalent optical path diagram of a green laser g1, which is relatively far from the blue laser b, repeatedly reflected in a beam combining prism. For example... Figure 8 As shown, the incident angle of green laser g1 when it is incident on the beam combining surface is α, the refraction angle when it is incident inside the beam combining prism is β, the incident angle when it is incident from the beam combining surface to the first surface is γ, and the distance between the exit position and the incident position of green laser g1 is d. Then, according to the tangent relationship of a triangle, we can obtain:

[0092] tanγ=d / (s1+s2+s3+s4);

[0093] For s1, s2, s3, and s4, please refer to [reference needed]. Figure 6 The distance represented in the text is based on Figure 6 We can obtain: D = s2 + s3 = s1 + d + s4, from which we can conclude:

[0094] d = (D - d + D) · tanγ;

[0095]

[0096] To ensure a high degree of overlap between the emitted green laser and the red laser, the maximum distance between them should be half a laser spot. Therefore:

[0097]

[0098] Where D represents the width of the beam combining prism; h1 represents the distance when green laser g1 is incident on the beam combining prism; h2 represents the distance when green laser g2 is incident on the beam combining prism; and γ represents the incident angle when green laser is incident on the first surface.

[0099] For blue laser b, such asFigure 6 As shown, the incident angle of the blue laser b when incident on the light combining surface is a, the refraction angle when incident on the light combining prism is β, and the incident angle when incident on the second surface from the light combining surface is β. According to the tangent relationship of the triangle, the following can be obtained:

[0100] tan β = x / 2H;

[0101] And Thus, the following can be obtained:

[0102]

[0103] In order to make the blue laser have a high degree of coincidence with the red laser when the blue laser is emitted, the blue laser is emitted with a maximum difference of half the spot distance from the red laser. Thus, the following can be obtained:

[0104]

[0105] Wherein, H represents the thickness of the light combining prism, h3 represents the distance when the blue laser is incident on the light combining prism, h4 represents the distance when the red laser r1 is incident on the light combining prism, and β represents the incident angle when the blue laser is incident on the second surface.

[0106] In some embodiments, as shown in Figure 9 The light combining prism 10 includes two connecting surfaces, namely a first surface 102a and a second surface 102b. The first surface 102a, the second surface 102b and the light combining surface 101 are sequentially connected, and the cross section of the light combining prism is triangular.

[0107] The light combining surface 101 is used to introduce the blue laser g and the green laser b into the light combining prism, and finally combines the three-color laser. The red laser r can be reflected, the green laser g and the blue laser b can be transmitted. The first surface 102a and the second surface 102b are both provided with a full-waveband reflective film, which can efficiently reflect the incident light.

[0108] Specifically, the light combining process is as follows: the red laser r, the green laser g and the blue laser b are incident on the light combining surface 101. The red laser r is reflected by the light combining surface 101, and the green laser g and the blue laser b are transmitted through the light combining surface 101 and incident on the inside of the light combining prism 10. The green laser g and the blue laser b are first incident on the first surface 102a and reflected by the first surface 102a to the second surface 102b. Then, the second surface 102b reflects the green laser g and the blue laser b to the position where the red laser r is incident on the light combining surface 101, and the green laser g and the blue laser b are transmitted from the light combining surface 101 and combined with the red laser r.

[0109] The divergence angle of blue laser is smaller than that of green laser and red laser. When the three-color lasers are combined, the blue laser and the green laser pass through a longer optical path than the red laser, so that the divergence degree of the blue laser and the green laser can be increased, so that the divergence degrees of the three-color lasers are equivalent when finally emitted.

[0110] In some embodiments, as shown in Figure 10 and Figure 11 , the laser light source device further comprises a mirror 14, which can be arranged close to the first surface and / or the second surface, and is arranged at a distance from the combining prism. The green laser and the blue laser are incident from the combining surface into the combining prism, are emitted outwardly through the first surface and / or the second surface to the mirror, are reflected by the mirror back into the combining prism, and are finally emitted outwardly through the combining surface. By additionally arranging the mirror 14, the optical path of the green laser g and / or the blue laser b can be further increased, so that the divergence degree of the green laser and / or the blue laser can be increased.

[0111] Still taking the laser shown in Figure 1 as an example, as shown in Figure 10 , the mirror 14 is arranged close to the first surface 102a, and a dichroic film is arranged on the first surface 102a for transmitting the green laser g and reflecting the blue laser b. The green laser g and the blue laser b are incident into the combining prism 10 through the combining surface 101, are first incident to the first surface 102a, the green laser g is emitted outwardly from the first surface 102a, and the blue laser b is reflected from the first surface 102a to the second surface 102b. The green laser g emitted from the first surface 102a is incident to the mirror 14 and is reflected back into the combining prism 10 by the mirror 14, and is then emitted from the first surface 102a to the second surface 102b. The second surface 102b reflects the incident green laser g and blue laser b to the combining surface 101, and the incident positions of the green laser g and the blue laser b on the combining surface 101 are the incident positions of the red laser r. The green laser g and the blue laser b are transmitted from the combining surface 101 and combined with the red laser r.

[0112] The optical path of the green laser g can be changed by controlling the distance between the mirror 104 and the first surface 102a, so that the optical path of the green laser g is increased in a suitable range, so that the size of the green laser g is closer to that of the red laser when the green laser g is combined with the red laser.

[0113] Alternatively, as shown in Figure 11 , the mirror 14 can also be arranged on the second surface 102b. Figure 1The laser shown is reversed, and the reflector 14 is positioned close to the first surface 102a. The first surface 102a has a dichroic film for transmitting blue laser b and reflecting green laser g. Green laser g and blue laser b are incident on the combining surface 101 into the interior of the combining prism 10, first incident on the second surface 102b, and reflected back to the first surface 102a. Blue laser b is emitted from the first surface 102a, and green laser g is reflected back to the combining surface 101. Blue laser b emitted from the first surface 102a is incident on the reflector 14, reflected back into the combining prism 10, and then emitted from the first surface 102a back to the combining surface 101. The incident positions of green laser g and blue laser b on the combining surface 101 are the same as the incident positions of red laser r. Green laser g and blue laser b are transmitted from the combining surface 101 and combine with red laser r.

[0114] The optical path of the blue laser b can be changed by controlling the distance between the reflector 104 and the first surface 102a, thereby increasing the optical path of the blue laser b within a suitable range, so that when the blue laser b and the red laser combine, the size of the blue laser spot is closer to that of the red laser spot.

[0115] This embodiment only illustrates the beam combining by placing the reflector near the first surface 102a. In practical applications, the reflector can also be placed near the second surface 102b, or both near the first and second surfaces 102a can be placed. When the position of the reflector changes, the optical path and optical path need to be redesigned to reduce the difference in the combined beam spot of the three-color lasers.

[0116] In some embodiments, a dichroic film may be provided on the light combining surface 101 for transmitting green and blue lasers and reflecting red lasers.

[0117] In some embodiments, a polarization beam-splitting film can be disposed on the beam-combining surface 101 to transmit p-polarized light and reflect s-polarized light. Simultaneously, a phase delay element (such as a half-wave plate) needs to be disposed between the laser 11 and the beam-combining prism 10 to rotate the polarization direction of the laser emitted from the laser by 90 degrees, thereby converting red laser light into s-polarized light and green and blue laser light into p-polarized light.

[0118] In some embodiments, such as Figure 12 As shown, the light-combining prism can also be replaced with a light-combining assembly. The principle is to break down the surface of the light-combining prism used for light combining into individual components, thus allowing for more flexible setting of the position and angle of these components. Figure 12The light combination assembly shown is an example, which can include a light combination mirror 124, a mirror 125 and a parallel plate 126. The light combination mirror 124 is located on the light emitting side of the laser 11; the light combination mirror 124 is used to reflect red laser, transmit green laser and blue laser. The mirror 125 and the parallel plate 126 are both located on the side of the light combination mirror 124 away from the laser 11, and any two of the mirror 125, the parallel plate 126 and the light combination mirror 124 are at a set angle.

[0119] As shown in Figure 12 The parallel plate 126 includes a first surface 126a and a second surface 126b arranged oppositely; the first surface 126a is used to reflect green laser g and transmit blue laser b, and the second surface 126b is used to reflect blue laser b.

[0120] Specifically, the light combination process is as follows: red laser r, green laser g and blue laser b are incident on the light combination mirror 124, the red laser r is reflected by the light combination mirror 124, and the green laser g and the blue laser b are transmitted through the light combination mirror 124 and are first incident on the mirror 125 and then reflected by the mirror 125 to the parallel plate 126. When the green laser g and the blue laser b are incident on the first surface 126a of the parallel plate, the green laser g is directly reflected to the position where the red laser r of the light combination mirror 124 is incident, and the blue laser b is transmitted to the inside of the parallel plate 126 and further incident on the second surface 126b of the parallel plate 126 and then reflected by the second surface 126b to exit from the first surface 126a and exit from the position where the red laser r of the light combination mirror 124 is incident. The green laser g and the blue laser b are finally transmitted from the light combination mirror 124 and combined with the red laser r.

[0121] The divergence angle of blue laser and green laser is smaller than that of red laser. When the three-color laser is combined, the blue laser and the green laser pass through a longer optical path than the red laser, so that the divergence degree of the blue laser and the green laser can be increased. The divergence angle of blue laser is smaller than that of green laser, and the thickness of the parallel plate makes the blue laser pass through a longer optical path, so that the divergence degree of the blue laser can be further increased, so that the divergence degrees of the three-color laser are equivalent when finally emitted, and the uniformity of the combined light spot is improved.

[0122] In some embodiments, a dichroic film can be provided on the light combination mirror 124 for transmitting green laser and blue laser and reflecting red laser.

[0123] In some embodiments, a polarization beam splitter film can be arranged on the combiner 124 to transmit p-polarized light and reflect s-polarized light. Meanwhile, a phase delay element (such as a half-wave plate) needs to be arranged between the laser 11 and the combiner 10 to rotate the polarization direction of the laser emitted by the laser 11 by 90 degrees, thereby converting the red laser into s-polarized light and converting the green and blue lasers into p-polarized light.

[0124] In the above embodiment in which the cross section of the combiner is triangular, it is desired to make the green and blue lasers incident at the position where the red laser is incident after reciprocating reflection in the combiner, so that the three-color lasers have a high degree of coincidence, and the optical path of the lasers in the combiner needs to be reasonably designed.

[0125] Specifically, as shown in Figure 10 , the combiner 10 is arranged at an angle of 45° with respect to the plane in which the laser 11 is located, which makes it easier to control the direction of the combined light beam. The angle between the combiner surface 101 and the first surface 102a of the combiner is ω, the angle between the first surface 102a and the second surface 102b is θ, and the angle between the second surface 102b and the combiner surface 101 is φ. The path lengths of the two green lasers g, the blue laser b, and the two red lasers r emitted by the laser 11 when incident on the combiner surface 101 are different, and are h1-h5 in Figure 10 , respectively. The distance traveled by the blue laser from the combiner surface to the first surface is s1, the distance traveled from the first surface to the second surface is s2, and the distance traveled from the second surface to the combiner surface is s3.

[0126] Since the combiner surface 101 is arranged at an angle of 45° with respect to the plane in which the laser 11 is located, the interval between the two adjacent lasers is equal to the difference between the distances of the two adjacent lasers to the combiner surface 101. Taking the interval between the blue laser and the red laser as an example, it is h3-h4.

[0127] The angle of incidence of the blue laser b when incident on the combiner surface is α, the angle of refraction when incident in the combiner is β, the angle of incidence when incident from the combiner surface to the first surface is γ, and the angle of incidence when incident from the first surface to the second surface is υ. The distance between the exit position and the incident position of the blue laser b is d, and then according to the sine relationship of the triangle, we have:

[0128] s4=s1·sinβ / sin(β+2γ);

[0129] s5=s1·sin2γ / sin(β+2γ);

[0130] s6=s3·s1·sinβ / sin(β+2υ);

[0131] s7 = s3-s1-sin2υ / sin(β+2υ);

[0132] According to the relationship of the lengths of the sides of the right triangle, we have:

[0133] x 2 = [s2-sinβ-(s1+s3) / sin(β+2γ)] 2 -[s1-sin2γ-s3-sin2υ] 2 ;

[0134] And In order to make the blue laser exit with a high degree of coincidence with the red laser, the blue laser exit with the red laser maximum difference of half the distance of the spot, thus we have: h3-h4<d<2(h3-h4). The value range of d is brought into the above formula, we have:

[0135] 2(h3-h4) 2 <[s2-sinβ-(s1+s3) / sin(β+2γ)] 2 -[s1-sin2γ-s3-sin2υ] 2 <8(h3-h4) 2 .

[0136] The above relationship is determined according to the optical path shown in Figure 10 When the three-color laser is combined using the combining light path shown in Figure 11 or Figure 12 , the specific light path also needs to be determined, which is not described here.

[0137] The above embodiments of the present application are all taken as an example of using the laser shown in Figure 1 to specifically describe the combining process, and in actual application, Figure 2 and Figure 3 the laser shown in Figure 13 and Figure 14 can also be combined using a combining prism, which can be specifically referred to and

[0138] . Figure 13 Figure 2The three-color laser emitted by the laser can still use the light combining prism 10. In some embodiments, the light combining surface 101 can be divided into a first area 101a for receiving red laser and a second area 101b for receiving green laser and blue laser, wherein the first area 101a is used for reflecting the red laser r, transmitting the green laser g and the blue laser b; the second area 101b is used for transmitting the green laser g and the blue laser b, so that the green laser g and the blue laser b enter the light combining prism, and the green laser g and the blue laser b are finally incident on the incident position of the red laser r of the first area 101a after multiple reflections between the plurality of connecting surfaces 102 in the light combining prism, and are emitted from the first area 101a to combine with the red laser r.

[0139] The first area of the light combining surface can be provided with a dichroic film, or a polarization beam splitting film can also be provided on the light combining surface. When the polarization beam splitting film is provided on the light combining surface, a half-wave plate also needs to be provided between the laser 11 and the light combining prism 10.

[0140] As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1. Figure 14 As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1. Figure 3 As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1. Figure 2 As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1. Figure 3 As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1. Figure 2 As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1. Figure 2 As shown in FIG. 1, the three-color laser emitted by the laser can still use the light combining prism 10, and the light combining path is similar to that of the laser shown in FIG. 1, and the difference is that the area of the laser emitting the red laser is larger than that of the laser shown in FIG. 1, and the area of the laser emitting the green laser and the blue laser is also larger than that of the laser shown in FIG. 1.

[0141] The embodiments of the present application are examples of the above three lasers, and in actual application, when the structure of the laser changes, the structure of the light combining prism and the light combining path can also be adjusted accordingly, and the present application does not enumerate them one by one, and any technical solution using the light combining prism to increase the path of the laser with a smaller divergence angle to improve the uniformity of the light combining spot belongs to the protection scope of the present application.

[0142] Based on the same inventive concept, the embodiments of the present application also provide a projection device, as shown in FIG. 1 and FIG. 2, the projection device comprises a projection light source 1, an illumination light path 2, a display element 3 and a lens 4. Figure 15 Figure 16 Based on the same inventive concept, the embodiments of the present application also provide a projection device, as shown in FIG. 1 and FIG. 2, the projection device comprises a projection light source 1, an illumination light path 2, a display element 3 and a lens 4.

[0143] ​The projection light source 1 can adopt any of the above laser light source devices. The illumination light path 2 is located on the light exit side of the projection light source 1, and is used for shaping and homogenizing the laser light beam emitted by the projection light source. The display element 3 is located on the light exit side of the illumination light path, and is used for modulating the incident laser light beam to form an image light beam. The lens 4 is located on the light exit side of the display element, and is used for projecting and imaging the image light beam.

[0144] Figure 15 and Figure 16 The laser light source device using the two types of light combining prisms is shown respectively. Regardless of which light combining prism is used, the light combining light path needs to be designed according to the processing of the laser light beam of the illumination light path and the size of the display element and other limiting conditions.

[0145] Specifically, as shown in Figure 15 and Figure 16 , the illumination light path includes a diffusion element 21, an ommatidium lens group 22, a shaping lens group 23, and a total reflection prism 24.

[0146] The diffusion element 21 is located on the light exit side of the laser light source device, and is used for diffusing and homogenizing the incident laser light. The diffusion element 21 can diffuse the incident laser light in one step, improve the uniformity of the combined light beam, and improve the laser speckle. The diffusion element 21 can adopt a diffusion sheet, or can adopt a moving diffusion sheet, which is not limited here.

[0147] The ommatidium lens group 22 is a kind of homogenization element, and is located on the side away from the laser light source device. As shown in Figure 15 and Figure 16 , the ommatidium lens group is composed of two identical micro-lens arrays, and each micro-lens array contains dozens to hundreds of micro-lenses. The micro-lenses are usually square or hexagonal, and are closely arranged in a grid or honeycomb structure. The micro-lenses of the front and rear micro-lens arrays correspond one by one to form an integration channel. The front lens array divides the incident light into a plurality of sub-beams, and each sub-beam is imaged on a target surface (such as the light entrance surface of the display element 3) by the rear lens array. The light intensity distributions of different sub-beams are superimposed on each other, and after statistical averaging, homogenization is achieved. By adjusting the focal length and pitch of the micro-lenses, the divergence angle and uniformity of the output light field can be controlled.

[0148] The ommatidium lens group eliminates local light intensity differences through integration effect, and is suitable for scenes with high precision uniformity requirements. By designing the micro-lens parameters, the spot shape, size and uniformity can be optimized. The ommatidium lens is not sensitive to the spatial distribution and coherence of the light source, and can be used to process the laser light beam emitted by the laser light source.

[0149] In practical applications, the laser beam emitted by the laser light source device can cover an array of more than 60 microlenses when incident on the compound lens group, and the size of a single microlens can be reduced to about 0.2 mm x 0.1 mm. Therefore, the optical parameters of the light combining prism and the distance between the light combining prism and the laser need to be reasonably designed, so that the laser beam emitted by the laser light source device can be fully homogenized after being incident on the compound lens group, for subsequent imaging.

[0150] The shaping lens group 23 is located on the light exit side of the compound lens group 22, and is used to adjust the size of the homogenized laser beam and the angle when incident on the display element 3. The shaping lens group 23 can include at least one lens, and the surface shape, focal length, etc. of each lens can be designed according to actual needs. For example, as shown in the projection device of Figure 15 and Figure 16 The shaping lens group includes two lenses and a mirror between the two lenses, the mirror is used to turn the light path, and the two lenses are used to focus the laser beam on the light entrance surface of the display element 3 at a suitable incident angle.

[0151] The total reflection prism 24 is located on the light exit side of the shaping lens group 23, and the total reflection prism 24 is used to separate the illumination beam and the imaging beam. The laser beam emitted by the laser light source device is finally reflected by the total reflection prism 24 to the display element 3 after the homogenization and shaping process, and the light emitted after being modulated by the display element 3 will be transmitted through the total reflection prism 24 and incident on the lens 4.

[0152] The display element 3 is located on the light exit side of the illumination light path 2, and the display element 3 is used to modulate the incident light to form an image beam. In specific implementation, the display element 3 can adopt a transmissive light modulator or a reflective light modulator. Figure 15 and Figure 16 The display element 3 shown in and is a reflective light modulator. The display element 3 receives the light reflected by the total reflection prism 24 and modulates the incident light, and reflects the modulated light. Since the light path is folded back by the reflective light modulator, the volume of the projection system can be reduced.

[0153] In the embodiments of the present application, the display element 3 can adopt a liquid crystal on silicon (LCoS) or a digital micromirror (DMD).

[0154] LCoS is based on semiconductor technology to attach a Complementary Metal Oxide Semiconductor (CMOS) substrate to a glass substrate containing a transparent electrode, and then inject liquid crystal to encapsulate it. LCoS has the characteristics of high pixel aperture ratio and high resolution, and can form a high-resolution image.

[0155] DMD includes many tiny mirrors, each of which can be individually driven to deflect. By controlling the deflection angle of the DMD, the brightness of the light incident on the lens 4 can be controlled.

[0156] After the display element 3 modulates the incident light to form an image, the light is reflected to the lens 4, which forms an image, thereby projecting the image to the appropriate size for viewing.

[0157] Although preferred embodiments of the application have been described, those skilled in the art will appreciate that other modifications and variations to the preferred embodiments are possible without departing from the spirit and scope of the application. Therefore, it is intended that the appended claims encompass all such modifications and variations as fall within the scope of the application.

[0158] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application encompass all such modifications and changes as fall within the scope of the claims and their equivalents.

Claims

1. A laser light source apparatus, characterized by comprising: The laser light source device comprises: a laser for emitting three primary color laser lights; and a combining prism located on the light emitting side of the laser for combining the three primary color laser lights; the combining prism comprises a combining surface and a plurality of connecting surfaces; wherein the red laser light emitted by the laser is incident on the combining surface and reflected by the combining surface; the blue laser light and the green laser light emitted by the laser are incident on the combining surface and transmitted into the combining prism by the combining surface, the red laser light incident between the plurality of connecting surfaces after multiple reflections is transmitted by the combining surface and combined with the red laser light.

2. The laser light source apparatus according to claim 1, wherein the combining prism comprises three connecting surfaces, which are a first surface, a second surface and a third surface connected in sequence; the first surface and the third surface are further connected with the combining surface respectively; the combining surface is divided into a first region and a second region, the red laser light and the blue laser light are incident on the first region, and the green laser light is incident on the second region; the first region is used for reflecting the red laser light, transmitting the green laser light and the blue laser light, and the second region is used for transmitting the green laser light and reflecting the blue laser light; the green laser light is incident on the inside of the combining prism through the second region of the combining surface, and is incident on the first region of the combining surface after multiple reflections between the first surface, the combining surface and the third surface, and is emitted outward; the blue laser light is incident on the inside of the combining prism through the first region of the combining surface, and is incident on the first region of the combining surface after multiple reflections between the first surface, the second surface, the third surface and the combining surface, and is emitted outward.

3. The laser light source apparatus according to claim 1, wherein the combining prism comprises three connecting surfaces, which are a first surface, a second surface and a third surface connected in sequence; the first surface and the third surface are further connected with the combining surface respectively; the combining surface is divided into a first region and a second region, the red laser light and the blue laser light are incident on the first region, and the green laser light is incident on the second region; the first region is used for reflecting the red laser light, transmitting the green laser light and the blue laser light, and the second region is used for transmitting the incident laser light; the laser light source device further comprises: a beam splitter located between the laser and the second region; the beam splitter is used for transmitting the green laser light and reflecting the blue laser light; the green laser light is incident on the inside of the combining prism through the second region of the combining surface by the beam splitter, and is incident on the first region of the combining surface after multiple reflections between the first surface, the combining surface and the third surface, and is emitted outward; the blue laser light is incident on the inside of the combining prism through the first region of the combining surface, and is incident on the first region of the combining surface after multiple reflections between the first surface, the second surface, the third surface and the combining surface, and is emitted outward.

4. The laser light source apparatus according to claim 2 or 3, wherein the angle between the first surface and the combining surface is complementary to the angle between the first surface and the second surface; the width, thickness and distance between the laser and the combining prism of the combining prism satisfy: Wherein, D represents the width of the light combing prism, H represents the thickness of the light combing prism; h1 represents the maximum distance when the green laser is incident on the light combing prism, h2 represents the minimum distance when the green laser is incident on the light combing prism, h3 represents the distance when the blue laser is incident on the light combing prism, h4 represents the maximum distance when the red laser is incident on the light combing prism; γ represents the incident angle when the green laser is incident on the first surface, β represents the incident angle when the blue laser is incident on the second surface.

5. The laser light source apparatus according to claim 1, wherein The light combing prism comprises two connecting surfaces, namely a first surface and a second surface; the first surface, the second surface and the light combing surface are sequentially connected; The light combing surface is used for reflecting red laser, transmitting green laser and blue laser; the green laser and the blue laser are incident on the inside of the light combing prism through the light combing surface, and are incident on the light combing surface after multiple reflections between the first surface and the second surface, and are emitted outward.

6. The laser light source apparatus according to claim 1, wherein The light combing prism comprises two connecting surfaces, namely a first surface and a second surface; the first surface, the second surface and the light combing surface are sequentially connected; The laser light source device further comprises: A mirror is arranged close to the first surface and / or the second surface, and is spaced apart from the light combing prism by a certain distance; The green laser and the blue laser are incident on the inside of the light combing prism through the light combing surface, are emitted outward to the mirror through the first surface and / or the second surface, are reflected back to the inside of the light combing prism by the mirror, and are finally emitted outward through the light combing surface.

7. The laser light source apparatus according to claim 5 or 6, wherein The optical path of the blue laser in the light combing prism satisfies: 2 (h3 - h4) 2 <[s2 - sin β - (s1 + s3) / sin (β + 2γ)] 2 - [s1 - sin 2γ - s3 - sin 2υ] 2 < 8 (h3 - h4) 2 ; Wherein, h3 represents the distance when the blue laser is incident on the light combing prism, h4 represents the maximum distance when the red laser is incident on the light combing prism; γ represents the incident angle when the blue laser is incident on the first surface, υ represents the incident angle when the blue laser is incident on the second surface, β represents the incident angle when the blue laser is incident on the light combing surface from the second surface; s1 represents the distance of the blue laser from the light combing surface to the first surface, s2 represents the distance of the blue laser from the first surface to the second surface, and s3 represents the distance of the blue laser from the second surface to the light combing surface.

8. The laser light source apparatus according to claim 1, wherein The light combing assembly is used to replace the light combing prism; the light combing assembly comprises: A light combing mirror is arranged on the light emitting side of the laser; the light combing mirror is used for reflecting red laser, transmitting green laser and blue laser; Any two of the mirror, the parallel plate and the light combing mirror are arranged at a certain angle; The parallel plate comprises a first surface and a second surface arranged opposite to each other; the first surface is used for reflecting green laser and transmitting blue laser, and the second surface is used for reflecting blue laser.

9. The laser light source apparatus according to claim 1, wherein The light combing surface is provided with a dichroic film or a polarization beam splitting film.

10. A projection apparatus, characterized by, It comprises: A projection light source, the projection light source is the laser light source device according to any one of claims 1-9; An illumination light path is arranged on the light emitting side of the projection light source; The illumination light path comprises: A diffusion element is located on the light exit side of the laser light source device for diffusing and homogenizing the incident laser light. An ommatidium lens group is located on the side of the diffusion element facing away from the laser light source device. A shaping lens group is located on the light exit side of the ommatidium lens group. A total reflection prism is located on the light exit side of the shaping lens group. A display element is located on the light exit side of the illumination light path. A lens is located on the side of the total reflection prism facing away from the display element.

Images