Laser light source device and projection system

Abstract

The invention discloses a laser light source device and a projection system. The laser light source device comprises a plurality of laser chips arranged in an array and a light combining assembly located on the light emitting sides of the laser chips. The laser chips are arranged into a first light emitting area and a second light emitting area, the light combining assembly comprises a plurality of light combining parts, the surface of at least one light combining part is provided with a transmitting and reflecting layer, and the transmitting and reflecting layer is used for partially reflecting and partially transmitting laser emitted by the second light emitting area so as to increase the width of an emitted laser beam. The difference of the laser spot sizes of the lasers emitted by the first light emitting area and the second light emitting area after passing through the light combining assembly is reduced, the optical expansion amount of the lasers emitted by the second light emitting area in the light combining light spots is increased, and the contrast ratio of laser speckles is reduced.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a laser light source device and a projection system. Background Art

[0002] Projection display is a technology that uses a flat image to control the light source, utilizing an optical system and projection space to magnify the image and display it on the projection surface. With the development of projection display technology, it has gradually been applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment, and other fields. Its advantages, such as large display size and clear display, also meet the requirements of large-screen display.

[0003] Laser light sources offer advantages over other light sources, such as wide color gamut and high brightness, making them increasingly popular in the projection field. Currently, mainstream lasers have evolved from monochromatic to trichromatic lasers. However, due to the varying degrees of divergence of different laser colors and their strong interference, laser speckle is a serious problem, impacting projection display quality. Summary of the Invention

[0004] According to a first aspect of an embodiment of the present invention, a laser light source device is provided, comprising:

[0005] A plurality of laser chips are arranged in an array along a first direction and a second direction; the plurality of laser chips are arranged along the first direction to form a first light exiting area and a second light exiting area; the wavelengths of lasers emitted from the first light exiting area and the second light exiting area are different; the first direction and the second direction intersect;

[0006] A light-combining assembly is located on the light-emitting side of the multiple laser chips; the light-combining assembly includes multiple light-combining parts, and a transflective layer is provided on the surface of at least one of the multiple light-combining parts. The transflective layer is used to partially reflect and partially transmit the laser light emitted from the second light-emitting area to increase the width of the emitted laser light beam, so that the widths of the laser light beams emitted from the first light-emitting area and the second light-emitting area are the same after passing through the light-combining assembly.

[0007] In some embodiments of the present invention, the first light exiting area and the second light exiting area each include a plurality of laser chip rows arranged along the first direction;

[0008] The light combining component decomposes the laser beam emitted by each laser chip row in the second light emitting area, and combines the decomposed laser beams with the laser beams emitted by each laser chip row in the first light emitting area.

[0009] In some embodiments of the present invention, the plurality of laser chips include: a plurality of first laser chips, a plurality of second laser chips, and a plurality of third laser chips; the wavelengths of lasers emitted by the first laser chips, the second laser chips, and the third laser chips are different;

[0010] The multiple first laser chips are located in the first light exiting area and are arranged into two first laser chip rows along the second direction; the multiple second laser chips and the multiple third laser chips are located in the second light exiting area, the multiple second laser chips are arranged into a second laser chip row along the second direction, and the multiple third laser chips are arranged into a third laser chip row along the second direction.

[0011] In some embodiments of the present invention, the light combining assembly includes: a first light combining element, a second light combining element, and a third light combining element; the first light combining element, the second light combining element, and the third light combining element are arranged in sequence along the first direction; a transflective layer is provided on a surface of the second light combining element, and the transflective layer partially reflects and partially transmits laser light emitted by the third laser chip row and the second laser chip row;

[0012] The first light combining component includes a first part and a second part, and the third light combining component includes a third part and a fourth part; the first part of the first light combining component reflects the laser light emitted by the third laser chip row toward the second light combining component; the second light combining component reflects part of the laser light emitted by the third laser chip row toward the second part of the first light combining component, transmits part of the laser light emitted by the third laser chip row toward the third part of the third light combining component, transmits part of the laser light emitted by the second laser chip row toward the second part of the first light combining component, and reflects part of the laser light emitted by the second laser chip row toward the third part of the third light combining component; the second part of the first light combining component reflects the received part of the laser light emitted by the third laser chip row and the part of the laser light emitted by the second laser chip row toward the fourth part of the third light combining component; the third part and the fourth part of the third light combining component are both used to transmit the laser light emitted by the third laser chip and the second laser chip, and reflect the laser light emitted by the first laser chip.

[0013] In some embodiments of the present invention, the light combining assembly includes: a first light combining component, a second light combining component, a third light combining component, and a fourth light combining component; the first light combining component, the second light combining component, the third light combining component, and the fourth light combining component are arranged in sequence along the first direction;

[0014] The second light combining member includes a first portion and a second portion, and the fourth light combining member includes a third portion and a fourth portion; a surface of the first portion is provided with a first transflective layer, the first transflective layer being configured to partially reflect and partially transmit the laser light emitted by the third laser chip; a surface of the third light combining member is provided with a second transflective layer, the second transflective layer being configured to partially reflect and partially transmit the laser light emitted by the second laser chip;

[0015] The first part of the second light combining component transmits part of the laser light emitted by the third laser chip row toward the first light combining component, and reflects part of the laser light emitted by the third laser chip row toward the third light combining component; the first light combining component reflects part of the laser light emitted by the third laser chip row toward the second part of the second light combining component; the third light combining component transmits part of the laser light emitted by the third laser chip row, transmits part of the laser light emitted by the second laser chip row toward the second part of the second light combining component, and reflects part of the laser light emitted by the second laser chip row toward the first part of the fourth light combining component; the second part of the second light combining component emits part of the laser light emitted by the third laser chip row and part of the laser light emitted by the second laser chip row toward the fourth part of the fourth light combining component; the third and fourth parts of the fourth light combining component are both used to transmit the laser lights emitted by the third laser chip and the second laser chip, and reflect the laser light emitted by the first laser chip.

[0016] In some embodiments of the present invention, the light combining assembly includes: a first light combining component, a second light combining component, and a third light combining component; the first light combining component, the second light combining component, and the third light combining component are arranged in sequence along the first direction;

[0017] The second light combining member includes a first portion and a second portion, and the third light combining member includes a third portion and a fourth portion; a transflective layer is provided on a surface of the third portion, and the transflective layer is used to partially reflect and partially transmit the laser light emitted by the third laser chip row and the second laser chip row;

[0018] The first light combining component reflects the laser light emitted by the third laser chip row toward the first part of the second light combining component; the first part of the second light combining component transmits the received laser light emitted by the third laser chip row, reflects the laser light emitted by the second laser chip row, and emits it toward the third part of the third light combining component; the third part of the third light combining component transmits part of the laser light emitted by the third laser chip row and the second laser chip row, reflects part of the laser light emitted by the third laser chip row and the second laser chip row toward the second part of the second light combining component, and also reflects a laser light emitted by the first laser chip row; the second part of the second light combining component reflects part of the laser light emitted by the third laser chip row and the second laser chip row toward the fourth part of the third light combining component; the fourth part of the third light combining component reflects the laser light emitted by another first laser chip row, transmits part of the laser light emitted by the third laser chip row and the second laser chip row.

[0019] In some embodiments of the present invention, the laser light source device further includes: a phase delay element; the phase delay element is located on the light-emitting side of the light-combining component and is located in the optical path of the partial light-combining laser emitted by the light-combining component; the phase delay element is used to delay the phase of the incident laser by π.

[0020] In some embodiments of the present invention, the transflective layer has a transmittance of 25% to 75% for incident laser light and a reflectance of 75% to 25% for incident laser light;

[0021] The sum of the transmittance and reflectance of the transflective layer to the incident laser is greater than or equal to 90%.

[0022] In some embodiments of the present invention, the first laser chip is a red laser chip, the second laser chip is a blue laser chip, and the third laser chip is a green laser chip; the red laser chip is used to emit red laser light, the green laser chip is used to emit green laser light, and the blue laser chip is used to emit blue laser light.

[0023] A second aspect of an embodiment of the present invention provides a projection system, comprising any one of the above-mentioned laser light source devices, an illumination system, and a projection lens; the illumination system comprises: a light homogenizing element and a light modulator located on the light-emitting side of the laser light source device; the projection lens is located on the light-emitting side of the light modulator.

[0024] The laser light source device and projection system provided by embodiments of the present invention include a plurality of laser chips arranged in an array and a light-combining assembly located on the light-emitting side of the laser chips. The laser chips are arranged into a first light-emitting area and a second light-emitting area. The light-combining assembly includes a plurality of light-combining components, at least one of which has a transflective layer provided on its surface. The transflective layer is used to partially reflect and partially transmit the laser light emitted from the second light-emitting area, thereby increasing the width of the output laser beam, reducing the difference in laser spot size between the laser light emitted from the first and second light-emitting areas after passing through the light-combining assembly, increasing the optical etendue of the laser light emitted from the second light-emitting area in the combined light spot, and reducing the contrast of the laser speckle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings introduced below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the appearance of a laser provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the arrangement of laser chips provided in an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of light combination in related technology;

[0029] Figure 4 This is one of the schematic diagrams of combined light spots provided by an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a laser light source device provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the principle of a light combining element provided in an embodiment of the present invention;

[0032] Figure 7 The second schematic diagram of the combined light spot provided by the embodiment of the present invention;

[0033] Figure 8 A second structural diagram of a laser light source device provided in an embodiment of the present invention;

[0034] Figure 9 The second schematic diagram of the principle of the light combining element provided in the embodiment of the present invention;

[0035] Figure 10 The third schematic diagram of the principle of the light combining element provided by the embodiment of the present invention;

[0036] Figure 11 The third structural diagram of the laser light source device provided by an embodiment of the present invention;

[0037] Figure 12 The fourth schematic diagram of the principle of the light combining element provided in an embodiment of the present invention;

[0038] Figure 13 The fifth schematic diagram of the principle of the light combining element provided in the embodiment of the present invention;

[0039] Figure 14 A fourth structural diagram of a laser light source device provided in an embodiment of the present invention;

[0040] Figure 15 This is a schematic structural diagram of a projection system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present invention are all explained with reference to the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the present invention are only used to illustrate the relative position relationship and do not represent the true proportion.

[0042] Projection display is a technology that uses a flat image to control the light source, utilizing an optical system and projection space to magnify the image and display it on the projection surface. With the development of projection display technology, it has gradually been applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment, and other fields. Its advantages, such as large display size and clear display, also meet the requirements of large-screen display.

[0043] Laser light sources have the advantages of high color gamut and high brightness compared to other light sources, making them increasingly widely used in the projection field. Currently, the mainstream laser applications have been upgraded from monochromatic lasers to trichromatic lasers.

[0044] Most current lasers use semiconductor lasers, which are shaped like Figure 1As shown, the laser includes a light-emitting device 112 and a mounting substrate 111. The light-emitting device 112 comprises a frame, a cover, and optical components. The frame houses a laser chip and a reflective component. The cover and frame form a closed space. The optical components are located on the cover and can be used to collimate the emitted laser light. The mounting substrate includes a connection pattern and an electrical connection area for mounting the light-emitting device and achieving electrical connections to the light-emitting device.

[0045] The light emitting device is provided with a plurality of laser chips, which can be arranged in an array to form a Figure 2 As shown in the multiple rows and columns, a reflector (not shown in the figure) can be provided on the light-emitting side of the laser chip, and the reflector can reflect the laser light emitted by the corresponding laser chip.

[0046] In some embodiments, as Figure 2 As shown, the laser chips may include multiple types, for example, a first laser chip x1, a second laser chip x2 and a third laser chip x3, wherein the wavelengths of lasers emitted by the first laser chip x1, the second laser chip x2 and the third laser chip x3 are different.

[0047] In some embodiments, as Figure 2 As shown, the number of first laser chips x1 is the sum of the number of third laser chips x3 and second laser chips x2. 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.

[0048] Alternatively, the first laser chip x1 can be a red laser chip, the second laser chip x2 can be a blue laser chip, and the third laser chip x3 can be a green laser chip. The red laser chip can emit red laser light, the green laser chip can emit green laser light, and the blue laser chip can emit blue laser light. This enables full-color display.

[0049] In the related art, if Figure 2 When the laser chips arranged as shown are combined, Figure 3 As shown, a light combining component is set on the light emitting side of the laser chip. The light combining component can first combine the laser light emitted by the third laser chip x3 with the laser light emitted by the second laser chip x2, and then combine it with the laser light emitted by the first laser chip x1. The combined light spot is as shown in FIG. Figure 4 shown.

[0050] If the first laser chip x1 is a red laser chip, the second laser chip x2 is a blue laser chip, and the third laser chip x3 is a green laser chip, the divergence degrees of lasers of different colors are different. As the optical path increases, the divergence degree of the red laser r is greater than that of the green laser g and the blue laser b. Then, the sizes of the green light spots G and the blue light spots B after combining the light are smaller than the size of the red light spot R. The green light spots G and the blue light spots B are concentrated, and the optical etendue is small, resulting in concentrated laser speckle energy and high laser speckle contrast.

[0051] In order to reduce the contrast of laser speckle, an embodiment of the present invention provides a laser light source device, such as Figure 5 As shown, the laser light source device includes: multiple laser chips (x1, x2, x3) and a light combining component 12.

[0052] The laser chip included in the laser light source device can be Figure 2 Arranged as shown, Figure 2 As shown, the laser chips are arranged in an array along a first direction x and a second direction y, forming multiple rows and columns. The first direction x and the second direction y intersect. The laser chips are arranged along the first direction x to form a first light exit area c1 and a second light exit area c2. The laser chips installed in the first light exit area c1 and the second light exit area c2 are of different types, and the wavelengths of the laser light emitted are different.

[0053] In some embodiments, as Figure 2 As shown, the laser chips may include a first laser chip x1, a second laser chip x2, and a third laser chip x3. The lasers emitted by the first laser chip x1, the second laser chip x2, and the third laser chip x3 have different wavelengths. The first laser chip x1 is located in the first light-emitting area c1, and the second laser chip x2 and the third laser chip x3 are located in the second light-emitting area c2.

[0054] In some embodiments, the divergence of the laser light emitted by the first laser chip x1, the second laser chip x2, and the third laser chip x3 is different. The divergence of the laser light emitted by the first laser chip x1 can be greater than the divergence of the laser light emitted by the second laser chip x2 and the third laser chip x3. A light combining assembly 12 is provided on the light-emitting side of the laser chip. The light combining assembly 12 includes a plurality of light combining parts. A transflective layer is provided on the surface of at least one of the plurality of light combining parts. The transflective layer is used to partially reflect and partially transmit the laser light emitted from the second light emitting area c2 to increase the width of the emitted laser beam, thereby reducing the difference in the spot size of the laser light emitted from the first light emitting area c1 and the second light emitting area c2 after passing through the light combining assembly 12.

[0055] Because the laser light emitted by the first laser chip x1 is highly divergent and arranged in two columns, the combined light with the laser light emitted by the second laser chip x2 and the third laser chip x3 results in a greater etendue. This results in an inconsistency between the etendue of the laser light emitted by the first laser chip x1 and the laser light emitted by the second and third laser chips x2 and x3. In this embodiment of the present invention, a transflective layer is provided on at least one light-combining component of the light-combining assembly 12. The transflective layer partially reflects and partially transmits the laser light emitted by the second and third laser chips x2 and x3, thereby decomposing the laser beams emitted by the second and third laser chips x2 and x3. The decomposed laser beams are then combined with the laser beam emitted by the first laser chip x1 in conjunction with the other light-combining components. This reduces the difference in spot size between lasers of different wavelengths after the combined light, increases the etendue of the laser light emitted by the second and third laser chips x2 and x3 in the combined spot, and thus reduces the contrast of the laser speckle.

[0056] In some embodiments, the first laser chip x1 can be a red laser chip, the second laser chip x2 can be a blue laser chip, and the third laser chip x3 can be a green laser chip. After passing through the light-combining assembly provided by the embodiments of the present invention, the sizes of the red, green, and blue laser spots are similar, the consistency of the three-color laser spots is improved, and the uniformity of the light is enhanced. Specifically, the sizes of the blue and green spots increase after passing through the light-combining assembly, and the spot energy uniformity is improved, which helps to improve the speckle problem caused by laser coherence.

[0057] The embodiment of the present invention adopts a laser chip Figure 2 Taking the arrangement structure shown as an example, the specific structure and function of the light combining component are described in detail. For lasers with laser chips using other arrangement structures, as long as there is a large difference in the size of the laser spots of different wavelengths after light combining, the same problem as the embodiment of the present invention may exist. However, due to the different arrangements of the laser chips, the specific light combining components used in the light combining component and the position of the transflective layer may be different. Therefore, the embodiment of the present invention is described by way of example to explain the inventive concept of the present invention, and does not limit the type of laser chips, the arrangement structure, the specific light combining components used in the light combining component and the position of the transflective layer.

[0058] like Figure 2 As shown, the first laser chips x1 are arranged into two first laser chip rows in the first light exiting area c1, the second laser chips x2 are arranged into a second laser chip row in the second light exiting area c2, and the third laser chips x3 are arranged into a third laser chip row in the second light exiting area c2.

[0059] In some embodiments, as Figure 5As shown, the light combining assembly 12 may include: a first light combining element 121, a second light combining element 122, and a third light combining element 123; the first light combining element 121, the second light combining element 122, and the third light combining element 123 are arranged in sequence along the first direction x. If the direction of the light combining element parallel to the row of laser chips is called the length direction, and the direction perpendicular to the row of laser chips is called the width direction, then Figure 5 It can be seen that the widths of the first light combining element 121 and the third light combining element 123 are greater than the width of the second light combining element 122. The first light combining element 121 is arranged corresponding to the second light emitting area c2, the third light combining element 123 is arranged corresponding to the first light emitting area c1, and the second light combining element 122 is arranged corresponding to the second laser chip row.

[0060] Among them, the surface of the second light combining component 122 is provided with a transflective layer, which can partially reflect and partially transmit the lasers emitted by the third laser chip row and the second laser chip row; the first light combining component 121 includes a first part 121d and a second part 121u, and the third light combining component includes a third part 123d and a fourth part 123u.

[0061] The first part 121d of the first light combining component receives the laser light emitted by the third laser chip row and reflects the laser light emitted by the third laser chip row toward the second light combining component 122; the second light combining component 122 reflects part of the laser light emitted by the third laser chip row toward the second part 121u of the first light combining component, and transmits part of the laser light emitted by the third laser chip row toward the third part 123d of the third light combining component. At the same time, it also receives the laser light emitted by the second laser chip row, transmits part of the laser light emitted by the second laser chip row toward the second part 121u of the first light combining component, and reflects part of the laser light emitted by the second laser chip row toward the third part 123d of the third light combining component; the second part 121u of the first light combining component reflects part of the laser light emitted by the third laser chip row and part of the laser light emitted by the second laser chip row toward the fourth part 123u of the third light combining component; the third part 123d and the fourth part 123u of the third light combining component are both used to transmit the laser light emitted by the third laser chip and the second laser chip, and reflect the laser light emitted by the first laser chip.

[0062] As a result, the transflective layer on the surface of the second light-combining element 122 can split the laser light emitted by the second and third laser chip rows into two parts. Combined with the reflection effect of the second portion 121u of the first light-combining element, the two laser light parts can be respectively incident on the third and fourth parts of the third light-combining element, thereby combining with the laser light emitted by the first laser chip incident on the third and fourth parts. This improves the consistency of the optical etendue of the laser light emitted by the first, second, and third laser chips in the combined light spot.

[0063] like Figure 5As shown, the embodiment of the present invention is explained by taking the light-combining light beam emitted to the right as an example. In some embodiments, a reflective element can be provided on the light-emitting side of the third light-combining element, or the light-combining properties of the third light-combining element can be changed, so that the light-combining light beam is emitted upward, which is consistent with the light-emitting direction of the laser. It will not be elaborated here.

[0064] In some embodiments, the first laser chip x1 may be a red laser chip, the second laser chip x2 may be a blue laser chip, and the third laser chip x3 may be a green laser chip. Figure 6 As shown, the second light combining component 122 can partially reflect and partially transmit the green laser g and blue laser b incident from different directions. Figure 7 As shown, the red light spot R has high consistency with the green light spot G and the blue light spot B, has approximately the same size, and has uniform color distribution.

[0065] like Figure 6 As shown, the second light combiner 122 can be a light-transmitting flat plate, which includes a first surface s1 and a second surface s2 that are parallel to each other. In an embodiment of the present invention, the transflective layer needs to have the effect of partially transmitting and partially reflecting laser light of two wavelengths at the same time, so one transflective layer can be provided, or two transflective layers can be provided. If one transflective layer is provided, the transflective layer needs to have the effect of partially transmitting and partially reflecting laser light of two wavelengths. The transflective layer can be provided on any one of the first surface s1 and the second surface s2. If two transflective layers are provided, the two transflective layers can have the effect of partially transmitting and partially reflecting the two wavelengths respectively. The two transflective layers can be stacked and provided on any one of the first surface s1 and the second surface s2, or one transflective layer can be provided on each of the first surface s1 and the second surface s2.

[0066] The first light combiner 121 can adopt a reflective film or a reflective mirror, which can reflect light of the entire wavelength band. The first part 121d and the second part 121u of the first light combiner can be different areas of the same light combiner, or they can be separately arranged into two light combiners. The third light combiner 123 can adopt a dichroic film or a dichroic mirror, which can reflect the laser light emitted by the first laser chip and transmit the laser light emitted by the second laser chip and the third laser chip. Similarly, the third part 123d and the fourth part 123u of the third light combiner can be different areas of the same light combiner, or they can be separately arranged into two light combiners.

[0067] In some embodiments, as Figure 8As shown, the light combining assembly 12 may include: a first light combining component 121, a second light combining component 122, a third light combining component 123 and a fourth light combining component 124; the first light combining component 121, the second light combining component 122, the third light combining component 123 and the fourth light combining component 124 are arranged in sequence along the first direction x. Figure 8 It can be seen that the widths of the second light-combining element 122 and the fourth light-combining element 124 can be greater than the widths of the first light-combining element 121 and the third light-combining element 123. The second light-combining element 122 is provided corresponding to the second light-emitting area c2, the fourth light-combining element 124 is provided corresponding to the first light-emitting area c1, the first light-combining element 121 is provided corresponding to the third row of laser chips, and the third light-combining element 123 is provided corresponding to the second row of laser chips.

[0068] Among them, the second light combining component 122 includes a first part 122d and a second part 122u, and the fourth light combining component 124 includes a third part 124d and a fourth part 124u; the surface of the first part 122d of the second light combining component is provided with a first transflective layer, and the first transflective layer is used to partially reflect and partially transmit the laser emitted by the third laser chip row; the surface of the third light combining component 123 is provided with a second transflective layer, and the second transflective layer is used to partially reflect and partially transmit the laser emitted by the second laser chip row.

[0069] The first part 122d of the second light combining component receives the laser light emitted by the third laser chip row and transmits part of the laser light emitted by the third laser chip row to the first light combining component 121, and reflects part of the laser light emitted by the third laser chip row to the third light combining component 123; the first light combining component 121 reflects part of the laser light emitted by the third laser chip row received to the second part 122u of the second light combining component; the third light combining component 123 transmits part of the laser light emitted by the third laser chip row received, and at the same time receives the laser light emitted by the second laser chip row and reflects the laser light emitted by the second laser chip row received to the third light combining component 123; Part of the laser light emitted by the third laser chip is transmitted to the second part 122u of the second light combining component, and part of the laser light emitted by the second laser chip is reflected to the first part 124d of the fourth light combining component; the second part 122u of the second light combining component combines the received part of the laser light emitted by the third laser chip and the part of the laser light emitted by the second laser chip to the fourth part 124u of the fourth light combining component; the third part 124d and the fourth part 124u of the fourth light combining component are both used to transmit the laser light emitted by the third laser chip and the second laser chip, and reflect the laser light emitted by the first laser chip.

[0070] Thus, the first transflective layer located on the surface of the first part of the second light combiner can split the laser light emitted by the third laser chip into two parts, and then cooperate with the reflection effect of the first light combiner and the light combining effect of the second part of the second light combiner to respectively enter the third and fourth parts of the fourth light combiner. The second transflective layer located on the surface of the third light combiner can split the laser light emitted by the second laser chip into two parts, and then cooperate with the light combining effect of the second part of the second light combiner to respectively enter the third and fourth parts of the fourth light combiner. In this way, the laser light is combined with the laser light of the first laser chip incident on the third and fourth parts. This improves the consistency of the optical extension of the laser light emitted by the first laser chip, the second laser chip and the third laser chip in the combined light spot.

[0071] like Figure 8 As shown, the embodiment of the present invention is explained by taking the light-combining light beam emitted to the right as an example. In some embodiments, a reflective element can be provided on the light-emitting side of the fourth light-combining element, or the light-combining properties of the fourth light-combining element can be changed, so that the light-combining light beam is emitted upward, which is consistent with the light-emitting direction of the laser. It will not be elaborated here.

[0072] In some embodiments, the first laser chip x1 may be a red laser chip, the second laser chip x2 may be a blue laser chip, and the third laser chip x3 may be a green laser chip. Figure 9 As shown, the first portion 122d of the second light combining member can partially reflect and partially transmit the green laser g, while the second portion 122u of the second light combining member can reflect the blue laser and transmit the green laser, thereby combining the blue laser b and the green laser g incident from different directions. Figure 10 As shown, the third light combining component 123 can transmit the green laser g, partially reflect the incident blue laser b, and partially transmit it. Figure 7 As shown, the red light spot R has high consistency with the green light spot G and the blue light spot B, has approximately the same size, and has uniform color distribution.

[0073] Similarly, the light combining component can adopt a light-transmitting flat plate, and the transflective layer can be provided on the surface of the light-transmitting flat plate. The first light combining component 121 can adopt a reflective film or a reflective mirror, which can reflect light of the entire wavelength band. The second part of the second light combining component can adopt a dichroic film or a dichroic mirror, which can reflect the laser emitted by the second laser chip and transmit the laser emitted by the third laser chip. The first part 122d and the second part 122u of the second light combining component can be zoned for coating different areas of the same light combining component, or can be separately provided as two light combining components. The fourth light combining component 124 can adopt a dichroic film or a dichroic mirror, which can reflect the laser emitted by the first laser chip and transmit the laser emitted by the second laser chip and the third laser chip. The fourth light combining component includes the third part 124d and the fourth part 124u, which can be different areas of the same light combining component, or can be separately provided as two light combining components.

[0074] In some embodiments, as Figure 11 As shown, the light combining assembly 12 may include: a first light combining component 121, a second light combining component 122 and a third light combining component 123; the first light combining component 121, the second light combining component 122 and the third light combining component 123 are arranged in sequence along the first direction x. Figure 11 It can be seen that the width of the first light-combining element 121 is smaller than the widths of the second light-combining element 122 and the third light-combining element 123. The first light-combining element 121 is provided corresponding to the third laser chip row, the second light-combining element 122 is provided corresponding to the second laser chip row and an adjacent first laser chip row, and the third light-combining element 123 is provided corresponding to the first light-emitting area c1.

[0075] Among them, the second light combining component 122 includes a first part 122d and a second part 122u, and the third light combining component 123 includes a third part 123d and a fourth part 123u; the surface of the third part 123d of the third light combining component is provided with a transflective layer, which is used to partially reflect and partially transmit the lasers emitted by the third laser chip row and the second laser chip row.

[0076] The first light combining component 121 receives the laser light emitted by the third laser chip row and reflects the laser light emitted by the third laser chip row to the first part 122d of the second light combining component; the first part 122d of the second light combining component transmits the laser light emitted by the third laser chip row to the third part 123d of the third light combining component, and at the same time receives the laser light emitted by the second laser chip row and reflects the laser light emitted by the second laser chip row to the third part 123d of the third light combining component; the third part 123d of the third light combining component transmits the laser light emitted by the third laser chip row and the second laser chip row to the third part 123d of the third light combining component. Part of the laser is transmitted, and part of the laser light emitted by the third laser chip row and the second laser chip row is reflected toward the second part 122u of the second light combining component, and at the same time, a laser light emitted by the first laser chip row is also reflected; the second part 122u of the second light combining component reflects part of the laser light emitted by the third laser chip row and the second laser chip row toward the fourth part of the third light combining component; the fourth part 123u of the third light combining component reflects the laser light emitted by another first laser chip row, and transmits part of the laser light emitted by the third laser chip row and the second laser chip row.

[0077] As a result, the laser light emitted by the third and second laser chip rows is combined by the first portion of the second light combining element. The transflective layer located on the surface of the first portion of the third light combining element can split the laser light emitted by the third and second laser chip rows into two parts. These parts, combined with the reflection effect of the second portion of the second light combining element, are then incident on the third and fourth portions of the third light combining element, respectively, thereby combining with the laser light from the first laser chip incident on the third and fourth portions. This improves the consistency of the optical etendue of the laser light emitted by the first, second, and third laser chips in the combined light spot.

[0078] like Figure 11 As shown, the embodiment of the present invention is explained by taking the combined light beam emitted to the right as an example. In some embodiments, a reflective element can be provided on the light-emitting side of the third light-combining element so that the combined light beam is emitted upward, which is consistent with the light-emitting direction of the laser. It will not be elaborated here.

[0079] In some embodiments, the first laser chip x1 may be a red laser chip, the second laser chip x2 may be a blue laser chip, and the third laser chip x3 may be a green laser chip. Figure 12 As shown, the first portion 122d of the second light combining element can combine the green laser g and the blue laser b, and the second portion 122u of the second light combining element can reflect the incident full-band light. Figure 13 As shown, the third portion 123d of the third light combining component 123 can partially reflect and partially transmit the incident blue laser g and blue laser b, and can also reflect the red laser r. The fourth portion 123u of the third light combining component 123 can reflect the red laser r and transmit the blue laser b and green laser g. The combined light spot after passing through the light combining component is as shown in FIG. Figure 7 As shown, the red light spot R has high consistency with the green light spot G and the blue light spot B, has approximately the same size, and has uniform color distribution.

[0080] The first light combiner 121 can be formed of a reflective film or a reflective mirror to reflect light across the entire wavelength range. The first portion 122d of the second light combiner can be formed of a dichroic film or a dichroic mirror to reflect the laser light emitted by the second laser chip and transmit the laser light emitted by the third laser chip. The first portion 122d of the second light combiner can be formed of a reflective film or a reflective mirror to reflect light across the entire wavelength range. The first portion 122d and the second portion 122u of the second light combiner can be coated with different regions of the same light combiner or can be separated into two light combiners. The third portion 123d of the third light combiner has both light combining and transflective functions. The fourth portion 123d of the third light combiner has light combining functions and can be formed of a dichroic film or a dichroic mirror to reflect the laser light emitted by the first laser chip and transmit the laser light emitted by the second and third laser chips. The fourth light combiner, including the third portion 124d and the fourth portion 124u, can be coated with different regions of the same light combiner or can be separated into two light combiners.

[0081] In an embodiment of the present invention, the transmittance of the transflective layer to the incident laser light can be 25% to 75%, and correspondingly, the reflectance of the incident laser light can be 75% to 25%. The sum of the transmittance and reflectance is greater than or equal to 90%. Optionally, the transmittance and reflectance of the transflective layer to the incident laser light can both be set to 50%, thereby making the energy distribution of the combined light beam more uniform.

[0082] In some embodiments, as Figure 14 As shown, the laser light source device further includes a phase delay element 13 and a diffusion element 14 .

[0083] The phase delay element 13 is located on the light-emitting side of the light-combining component 12 and in the optical path of part of the combined laser light emitted by the light-combining component. The phase delay element 13 is used to delay the phase of the incident laser by π, thereby rotating the polarization direction of the laser light by 90 degrees. Then, the polarization direction of the laser light that has not passed through the phase delay element 13 is perpendicular to the polarization direction of the laser light that has passed through the phase delay element 13. This can greatly reduce the coherence between the laser lights, thereby reducing the contrast of the speckle.

[0084] In some embodiments, as Figure 14 As shown, the light combining component 12 divides the output laser light of the laser into two paths, and the phase delay element 13 can be located in one of the light paths. The phase delay element 13 can be a half-wave plate.

[0085] The diffusion element 14 can be located on the light-emitting side of the light-combining assembly 12 to further diffuse the incident laser light, thereby improving the uniformity of the combined light beam and reducing laser speckle. The diffusion element 14 can be a diffuser or a moving diffuser, which is not limited here.

[0086] Based on the same inventive concept, an embodiment of the present invention further provides a projection system, such as Figure 15 As shown, the projection system includes a laser light source device 1 , an illumination system 2 and a projection lens 3 .

[0087] The laser light source device 1 can be any of the above-mentioned laser light source devices. The lighting system 2 is located on the light-emitting side of the laser light source device 1 and is used to shape and homogenize the laser beam emitted by the laser light source device 1. Figure 15 As shown, the lighting system 2 includes: a light homogenizing element 21 , a shaping lens 22 and a light modulator 23 .

[0088] The light homogenizing element 21 can be Figure 15 The light guide shown can also utilize a light-homogenizing element such as a fly-eye lens. When a light guide is used as the light-homogenizing element 21, a beam reduction lens 15 can be positioned on the light-exiting side of the diffuser 14 to ensure uniform laser light enters the light guide. The shaping lens 22 adjusts the shape and size of the laser spot incident on the light modulator 23, ensuring that the laser beam enters the light modulator 23 at a suitable angle.

[0089] The light modulator 23 is used to modulate the incident light to form an image. In a specific implementation, the light modulator 23 can be a transmissive light modulator or a reflective light modulator. Figure 15 The light modulator 23 shown is a reflective light modulator. The light modulator 23 receives light reflected by the beam splitter prism P, modulates the incident light, and reflects the modulated light. Because the light path is folded back through the reflective light modulator, the size of the projection system can be reduced.

[0090] In the embodiment of the present invention, the light modulator 23 may be Liquid Crystal on Silicon (LCoS) or a Digital Micromirror Device (DMD).

[0091] LCoS is a semiconductor technology that combines a complementary metal oxide semiconductor (CMOS) substrate with a glass substrate containing transparent electrodes, and then injects liquid crystal packaging. LCoS features a high aperture ratio and high resolution for each pixel, enabling the production of high-resolution images.

[0092] The DMD includes many tiny reflective mirrors, each of which can be driven individually to deflect. By controlling the deflection angle of the DMD, the brightness of the light incident on the projection lens 3 is controlled.

[0093] The dichroic prism P is used to separate the illumination beam and the imaging beam. The laser beam emitted by the laser light source device 1 is finally reflected toward the light modulator 23 by the dichroic prism P after undergoing processes such as shaping and homogenization. The light emitted after being modulated by the light modulator 23 will pass through the dichroic prism P and be incident on the projection lens 3.

[0094] After the light modulator 23 modulates the incident light to form an image, the light is reflected toward the projection lens 3 , which forms an image, thereby projecting the image to a suitable size for viewing.

[0095] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0096] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A laser light source device, characterized in that: include: A plurality of laser chips are arranged in an array along a first direction and a second direction; the plurality of laser chips are arranged along the first direction to form a first light emitting area and a second light emitting area; The wavelengths of the lasers emitted by the first light emitting area and the second light emitting area are different; the first direction and the second direction intersect; A light-combining component is located on the light-emitting side of the multiple laser chips; the light-combining component includes multiple light-combining parts, and a transflective layer is provided on the surface of at least one of the multiple light-combining parts. The transflective layer is used to partially reflect and partially transmit the laser emitted from the second light-emitting area to increase the width of the emitted laser beam.

2. The laser light source device according to claim 1, wherein The first light exiting area and the second light exiting area each include a plurality of laser chip rows arranged along the first direction; The light combining component decomposes the laser beam emitted by each laser chip row in the second light emitting area, and combines the decomposed laser beams with the laser beams emitted by each laser chip row in the first light emitting area.

3. The laser light source device according to claim 2, wherein: The plurality of laser chips include: a plurality of first laser chips, a plurality of second laser chips, and a plurality of third laser chips; the wavelengths of lasers emitted by the first laser chips, the second laser chips, and the third laser chips are different; The multiple first laser chips are located in the first light exiting area and are arranged into two first laser chip rows along the second direction; the multiple second laser chips and the multiple third laser chips are located in the second light exiting area, the multiple second laser chips are arranged into a second laser chip row along the second direction, and the multiple third laser chips are arranged into a third laser chip row along the second direction.

4. The laser light source device according to claim 3, wherein: The light combining assembly includes: a first light combining member, a second light combining member, and a third light combining member; the first light combining member, the second light combining member, and the third light combining member are arranged in sequence along the first direction; a transflective layer is provided on a surface of the second light combining member, and the transflective layer partially reflects and partially transmits laser light emitted by the third laser chip row and the second laser chip row; The first light combining component includes a first part and a second part, and the third light combining component includes a third part and a fourth part; the first part of the first light combining component reflects the laser light emitted by the third laser chip row toward the second light combining component; the second light combining component reflects part of the laser light emitted by the third laser chip row toward the second part of the first light combining component, transmits part of the laser light emitted by the third laser chip row toward the third part of the third light combining component, transmits part of the laser light emitted by the second laser chip row toward the second part of the first light combining component, and reflects part of the laser light emitted by the second laser chip row toward the third part of the third light combining component; the second part of the first light combining component reflects the received part of the laser light emitted by the third laser chip row and the part of the laser light emitted by the second laser chip row toward the fourth part of the third light combining component; the third part and the fourth part of the third light combining component are both used to transmit the laser light emitted by the third laser chip and the second laser chip, and reflect the laser light emitted by the first laser chip.

5. The laser light source device according to claim 3, wherein: The light combining assembly includes: a first light combining component, a second light combining component, a third light combining component, and a fourth light combining component; the first light combining component, the second light combining component, the third light combining component, and the fourth light combining component are arranged in sequence along the first direction; The second light combining member includes a first portion and a second portion, and the fourth light combining member includes a third portion and a fourth portion; a surface of the first portion is provided with a first transflective layer, the first transflective layer being configured to partially reflect and partially transmit the laser light emitted by the third laser chip; a surface of the third light combining member is provided with a second transflective layer, the second transflective layer being configured to partially reflect and partially transmit the laser light emitted by the second laser chip; The first part of the second light combining component transmits part of the laser light emitted by the third laser chip row toward the first light combining component, and reflects part of the laser light emitted by the third laser chip row toward the third light combining component; the first light combining component reflects part of the laser light emitted by the third laser chip row toward the second part of the second light combining component; the third light combining component transmits part of the laser light emitted by the third laser chip row, transmits part of the laser light emitted by the second laser chip row toward the second part of the second light combining component, and reflects part of the laser light emitted by the second laser chip row toward the first part of the fourth light combining component; the second part of the second light combining component emits part of the laser light emitted by the third laser chip row and part of the laser light emitted by the second laser chip row toward the fourth part of the fourth light combining component; the third and fourth parts of the fourth light combining component are both used to transmit the laser lights emitted by the third laser chip and the second laser chip, and reflect the laser light emitted by the first laser chip.

6. The laser light source device according to claim 3, wherein: The light combining assembly includes: a first light combining component, a second light combining component, and a third light combining component; the first light combining component, the second light combining component, and the third light combining component are arranged in sequence along the first direction; The second light combining member includes a first portion and a second portion, and the third light combining member includes a third portion and a fourth portion; a transflective layer is provided on a surface of the third portion, and the transflective layer is used to partially reflect and partially transmit the laser light emitted by the third laser chip row and the second laser chip row; The first light combining component reflects the laser light emitted by the third laser chip row toward the first part of the second light combining component; the first part of the second light combining component transmits the received laser light emitted by the third laser chip row, reflects the laser light emitted by the second laser chip row, and emits it toward the third part of the third light combining component; the third part of the third light combining component transmits part of the laser light emitted by the third laser chip row and the second laser chip row, reflects part of the laser light emitted by the third laser chip row and the second laser chip row toward the second part of the second light combining component, and also reflects a laser light emitted by the first laser chip row; the second part of the second light combining component reflects part of the laser light emitted by the third laser chip row and the second laser chip row toward the fourth part of the third light combining component; the fourth part of the third light combining component reflects the laser light emitted by another first laser chip row, transmits part of the laser light emitted by the third laser chip row and the second laser chip row.

7. The laser light source device according to any one of claims 2 to 6, wherein: The laser light source device further includes: a phase delay element; the phase delay element is located on the light-emitting side of the light-combining component and in the optical path of a portion of the combined laser light emitted by the light-combining component; the phase delay element is used to delay the phase of the incident laser light by π.

8. The laser light source device according to any one of claims 1 to 6, wherein: The transflective layer has a transmittance of 25% to 75% for incident laser light and a reflectance of 75% to 25% for incident laser light; The sum of the transmittance and reflectance of the transflective layer to the incident laser is greater than or equal to 90%.

9. The laser light source device according to any one of claims 3 to 6, wherein: The first laser chip is a red laser chip, the second laser chip is a blue laser chip, and the third laser chip is a green laser chip; the red laser chip is used to emit red laser light, the green laser chip is used to emit green laser light, and the blue laser chip is used to emit blue laser light.

10. A projection system, characterized in that: include: The laser light source device, lighting system and projection lens according to any one of claims 1 to 9; The lighting system includes: a light homogenizing element and a light modulator located on the light output side of the laser light source device; The projection lens is located on the light-emitting side of the light modulator.

Images