Light source device, lighting system and projection system

Abstract

The utility model discloses a light source device, an illumination system and a projection system, and belongs to the technical field of illumination and projection. The light source device comprises a first light-emitting element used for emitting first light; the diffusion element is arranged on a light path of the first light and is used for diffusing the first light; the second light-emitting element is used for emitting second light; the wavelength conversion element is arranged on a light path of the second light and used for converting at least part of the second light into third light with different wavelength ranges, and the wavelength ranges of the first light and the third light are different; the light combining element is used for receiving the first light from the diffusion element and the third light from the wavelength conversion element and combining the first light and the third light; and a compensation element provided between the first light emitting element and the diffusion element, the compensation element for diffusing the first light. The light source device can improve the color uniformity of illumination light.

Description

TECHNICAL FIELD

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

[0002] Laser remote fluorescence technology uses laser to excite a remote fluorescent material to obtain stimulated light, and uses the obtained stimulated light and other light beams with different wavelength ranges to obtain white light or other different color light, so as to be applied to lighting, projection and other scenes.

[0003] The uniformity of the light beam formed by the light combination has always been a difficulty and pain point restricting the development of laser remote fluorescence technology. Taking the example of blue excitation light exciting a fluorescent material to generate yellow stimulated light, the relative proportion of the blue excitation light and the yellow stimulated light can make the central region of the light combination show a good white spectrum, but the surrounding region of the light combination often shows a yellow ring, that is, the entire region of the light combination spot often has color non-uniformity. UTILITARIAN CONTENT

[0004] The purpose of the embodiments of the present application is to provide a light source device for improving the color uniformity of the outgoing light.

[0005] To achieve the above-mentioned purpose, in one aspect, the embodiments of the present application provide a light source device, comprising:

[0006] a first light emitting element for emitting first light;

[0007] a diffusion element arranged on the light path of the first light for diffusing the first light;

[0008] a second light emitting element for emitting second light;

[0009] a wavelength conversion element arranged on the light path of the second light for converting at least part of the second light into third light with a different wavelength range, wherein the wavelength ranges of the first light and the third light are different;

[0010] a light combination element for receiving the first light from the diffusion element and the third light from the wavelength conversion element, and combining the first light and the third light; and

[0011] a compensation element arranged between the first light emitting element and the diffusion element, the compensation element being configured to diffuse the first light.

[0012] In some possible implementation manners, the compensation element comprises an angle diffusion sheet.

[0013] In some possible implementation manners, the angle diffusion range of the angle diffusion sheet is 0.4 degrees to 5 degrees.

[0014] In some possible implementation manners, the first light forms a spot on the light exit surface of the diffusion element, and the third light forms a spot on the light exit surface of the wavelength conversion element, and the size of the spot formed by the first light is substantially consistent with the size of the spot formed by the third light.

[0015] In some possible implementation manners, the relative ratio of the light power density of the central region to the light power density of the edge region of the first light emitted via the diffusion element is substantially consistent with the relative ratio of the light power density of the central region to the light power density of the edge region of the third light emitted via the wavelength conversion element.

[0016] In some possible implementation manners, the first light and the second light are Gaussian distribution.

[0017] In some possible implementation manners, the third light includes first stimulated light and second stimulated light, the first stimulated light forms a spot R1 on the light exit surface of the wavelength conversion element, the second stimulated light forms a spot R2 on the light exit surface of the wavelength conversion element, the size of the spot R2 is greater than the size of the spot R1, and the spot R2 covers the spot R1, and the second stimulated light is formed by lateral diffusion inside the wavelength conversion element.

[0018] In some possible implementation manners, the compensation element includes a substrate, and the substrate is configured as a light-transmissive medium.

[0019] The light entrance surface and / or the light exit surface of the substrate is provided with a microstructure; and / or,

[0020] The interior of the substrate is filled with scattering particles, and the scattering particles change the travel direction of the first light in a non-excited manner.

[0021] In some possible implementation manners, the compensation element includes a substrate, and the substrate is configured as a light-transmissive medium.

[0022] The light entrance surface and / or the light exit surface of the substrate is provided with a microstructure; and / or,

[0023] The interior of the substrate is filled with scattering particles, and the scattering particles change the travel direction of the first light in a reflective and / or refractive manner.

[0024] In some possible implementation manners, the first light-emitting element and / or the second light-emitting element includes a laser diode.

[0025] In a second aspect, an embodiment of the present application provides a lighting system, including the light source device as described above.

[0026] In a third aspect, an embodiment of the present application provides a projection system, including the light source device as described above.

[0027] Advantages of the present application:

[0028] The light source device provided by the embodiment of the present application adopts the first light and the third light to form the illumination light, wherein the compensation element is arranged between the first light emitting element and the diffusion element in the light path of the first light, the first light is diffused to enlarge the light spot of the first light incident to the diffusion element and reduce the light power density of the central region of the first light incident to the diffusion element, and the first light diffused by the diffusion element is basically consistent with the third light returned by the wavelength conversion element in the light spot size and the relative proportion of the light power density of the central region and the edge region, thereby improving the color uniformity of the mixed illumination light. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings, wherein:

[0030] Figure 1 Schematic diagram of the light source device known to the inventor;

[0031] Figure 2 Structure schematic diagram of the wavelength conversion element;

[0032] Figure 3 Schematic diagram of the light spot formed on the light emitting surface of the wavelength conversion element;

[0033] Figure 4 Schematic diagram of the light source device of the embodiment of the present application;

[0034] Figure 5 Schematic diagram of the light source device of the embodiment of the present application; Figure 4 Schematic diagram of the light path of the first light in the embodiment of the present application;

[0035] Figure 6 Schematic diagram of the light source device of the embodiment of the present application.

DETAILED DESCRIPTION

[0036] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or order of the indicated technical features. Thus, technical features defined with "first" and "second" may explicitly or implicitly include one or more of the stated technical features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, only specific examples of components and settings are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for the purpose of simplifying and clearly describing this application and does not in itself indicate a specific relationship between the various embodiments and / or settings discussed. Moreover, the various specific processes and materials described below are merely examples for implementing the technical solutions of this application; however, those skilled in the art should recognize that the technical solutions of this application can also be implemented using other processes and / or other materials not described below.

[0039] Furthermore, the described features and structures can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced even without one or more of the specific details described, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of this application.

[0040] In a light source based on laser remote fluorescence technology for illumination or projection, the white light for illumination or projection is usually obtained by mixing the laser light and the excited light generated by the phosphor excitation.

[0041] It is known that the laser beam has good directivity and collimation, while the excited light generated by the phosphor excitation is emitted in a Lambertian distribution in an ideal case. Therefore, when the laser beam is mixed with the excited light generated by the phosphor excitation, the problem of color non-uniformity of the spot is faced. For example, taking the example of mixing the yellow phosphor with the blue laser, through proportional configuration, the central region of the mixed spot can be white, but the edge region of the spot is obviously yellow, that is, the edge yellow ring.

[0042] The inventors know that previous studies increase the divergence angle of the laser by setting a diffusion sheet on the light path of the laser, and mix the divergent laser with the excited light generated by the phosphor sheet, so as to match each other when the laser and the excited light are mixed to suppress the yellow ring in the mixed spot. As shown in Figure 1 The schematic diagram of the light source device known to the inventors, which includes a first light emitting element 100, a diffusion element 101, a second light emitting element 102, a wavelength conversion element 103, and a light combining element 104. The first light emitting element 100 is used to emit first light, the diffusion element 101 is used to diffuse the first light to enlarge the divergence angle of the first light, the second light emitting element 102 is used to emit second light, the wavelength conversion element 103 receives the second light and converts at least part of the second light into third light with different wavelength range, wherein the third light has different wavelength range from the first light, and the light combining element 104 receives the third light from the diffusion element 101 and the wavelength conversion element 103 respectively, and guides the first light and the third light towards the same direction to make the first light and the third light mixed to obtain white light. As shown in Figure 1 In the light source device, the wavelength conversion element 103 is considered to emit the third light in a Lambertian light distribution when the excited light is generated, in order to make the first light and the third light have substantially the same light distribution and spot size, the diffusion element 101 changes the light distribution of the first light in a diffused manner, so that the first light is also emitted in a distribution form with substantially Lambertian light distribution after passing through the diffusion element 101, so that the difference between the first light and the third light can be compensated when the first light and the third light are mixed, and a color-uniform spot is obtained.

[0043] However, the inventors found that Figure 1The light source device is found to have a light spot with a yellow ring phenomenon, i.e. the first light and the third light have a great difference, resulting in a considerable inconsistency when mixed.

[0044] To improve the color uniformity of the light spot and obtain an ideal white light spot, i.e. substantially eliminate the yellow ring phenomenon at the edge of the light spot, the inventors have studied the light source device Figure 1 The light source device is found to have a light spot with a yellow ring phenomenon, i.e. the first light and the third light have a great difference, resulting in a considerable inconsistency when mixed. Figure 1 The basic concept of the light source device is that the third light emitted by the wavelength conversion element 103 and the first light diffused by the diffusion element 101 both have a Lambertian light distribution, so that the mixed light has a color uniformity. However, in practice, the third light emitted by the wavelength conversion element 103 does not have an ideal Lambertian light distribution.

[0045] As shown in Figure 2 , a schematic diagram of the light spot variation on the wavelength conversion element is shown. The inventors have found that in practice, the wavelength conversion element does not produce an emitted light with a Lambertian distribution as in the ideal case, as shown in Figure 2 The wavelength conversion element 103 includes a wavelength conversion material layer 1030 and a reflective layer 1031. The excitation light L1 enters the wavelength conversion material layer 1030, and the wavelength conversion material generates stimulated light. The inventors have found that the stimulated light generated by the wavelength conversion material layer 1030 is emitted through the light-emitting surface of the wavelength conversion material layer 1030 in different distribution forms. As shown in Figure 2The stimulated light generated by the wavelength conversion material layer 1030 includes first stimulated light L2 and second stimulated light L3. After the excitation light L1 is incident on the wavelength conversion material layer 1030, part of the excitation light L1 is converted by the wavelength conversion material in the wavelength conversion material layer 1030 and then exits the wavelength conversion material layer 1030 through the light exit surface of the wavelength conversion material layer 1030 or is reflected by the reflective layer 1031 and then exits the wavelength conversion material layer 1030 through the light exit surface of the wavelength conversion material layer 1030. This part of the stimulated light generally forms the first stimulated light L2, which has a relatively small spot size on the light exit surface of the wavelength conversion material layer 1030. Part of the excitation light L1 is converted by the wavelength conversion material in the wavelength conversion material layer 1030, and the generated stimulated light spreads laterally inside the wavelength conversion material layer 1030. This lateral spread is partly due to the randomness of the direction of the stimulated light generated by the wavelength conversion material, and partly due to the lateral shift caused by one or more reflections of the stimulated light between the two opposite surfaces of the wavelength conversion material layer 1030. Ultimately, this part of the stimulated light forms the second stimulated light L3, which spreads laterally inside the wavelength conversion material layer 1030. When the second stimulated light L3 exits the wavelength conversion material layer 1030 through the light exit surface of the wavelength conversion material layer 1030, it has a significantly enlarged spot relative to the first stimulated light L2. As shown in Figure 2 It can be found that the size of the second stimulated light L3 defined by the light exit surface of the wavelength conversion material layer 1030 is significantly larger than the size of the first stimulated light L2 defined by the light exit surface of the wavelength conversion material layer 1030.

[0046] Continuing to refer to Figure 3 , a schematic diagram of the light exit spot of the light exit surface of the wavelength conversion element is shown. As shown in Figure 3 , the wavelength conversion element at least partially converts the excitation light L1 (not shown) into third light having a longer wavelength range, and the light exit spot of the third light formed on the light exit surface 1032 of the wavelength conversion element is represented by R1 in Figure 3 . It can be understood that the third light at least includes the first stimulated light L2 and the second stimulated light L3, i.e., the first stimulated light L2 and the second stimulated light L3 are mixed to form the third light. Figure 3 In

[0047] Returning to Figure 1 , Figure 1 , the concept adopted by the light source device shown in Figure 2 and Figure 3As shown, the wavelength conversion material layer 1030 has a significant lateral expansion effect on the third light, which causes the light distribution of the third light to change when the third light exits the light exit surface 1032 of the wavelength conversion element 103 (e.g., the spot formed by the third light on the light exit surface of the wavelength conversion element 103 expands), and thus in actual operation, the third light exiting the wavelength conversion element 103 does not return to the combining element 104 in the form of ideal Lambertian light distribution. However, as shown in the embodiment, the third light exiting the wavelength conversion element 103 is in the form of a light spot that is larger than the light spot formed by the first light on the light exit surface of the wavelength conversion element 103, and thus the third light and the first light can be mixed to obtain a mixed light that is more uniform in color than the mixed light obtained in the prior art. Figure 1 In the prior concept, it is believed that the wavelength conversion element 103 exits the third light in the form of a substantially Lambertian light distribution, and thus a diffusion element 101 is arranged in the light path of the first light to diffuse the first light into the form of a substantially Lambertian light distribution for mixing with the third light to obtain a mixed light that is substantially uniform in color. However, in actual operation, the third light returned by the wavelength conversion element 103 has a light spot that is significantly larger than the light spot of the Lambertian light distribution, and thus when the first light and the third light are combined, the color uniformity of the light spot is improved to some extent, but the mixed light still has a significant yellow ring phenomenon in the edge region of the light spot, i.e., the overall mixed light still has a significant color non-uniformity.

[0048] Of course, when the first light enters the diffusion element 101, the first light also expands in the lateral direction inside the diffusion element 101 to some extent, i.e., the light spot formed by the first light when exiting the diffusion element 101 is larger than the light spot formed by the first light when entering the diffusion element 101. However, the inventors have found that the lateral diffusion effect of the diffusion element 101 on the first light is much smaller than the lateral diffusion effect of the wavelength conversion element 102 on the second light, i.e., the diffusion element 101 expands the lateral size of the light spot to a smaller extent than the wavelength conversion element 102. Thus, the first light diffused by the diffusion element 101 and the third light returned by the wavelength conversion element 102 still form a significant yellow ring in the edge region when combined. The inventors have found that the wavelength conversion element 102 and the diffusion element 101 have obvious differences in spite of both being beneficial to increasing the divergence angle of the exiting light and expanding the light spot. The wavelength conversion element 102 uses the wavelength conversion material inside to excite the incident light to convert the incident light into excited light with a longer wavelength range and exit the excited light in random directions. The diffusion element 101 usually changes the travel direction of the incident light in a non-excited manner, e.g., by arranging microstructures on the surface of the diffusion element 101 or adding particles with reflectivity or refractivity to the diffusion element 101. The size change caused by the lateral diffusion of the incident light in the non-excited manner is much smaller than the size change caused by the lateral diffusion of the incident light in the wavelength conversion element 102. Thus, the prior concept has obvious deficiencies in effect in spite of improving the color uniformity of the mixed light to some extent. Figure 1 ​

[0049] On the other hand, the inventors discovered that the wavelength conversion element 102 experiences a decrease in conversion efficiency when the temperature is too high. In lighting and some high-power projection scenarios, the incident light power is high. During the process of the incident light being excited by the wavelength conversion element 102 and converted into laser light, heat is continuously accumulated. The wavelength conversion element 102 is usually connected to a heat dissipation structure to dissipate this accumulated heat in a timely manner to achieve thermal balance. However, the optical power density in the central region of the incident light is significantly higher than that in the edge region, resulting in more heat accumulation in the central region than heat dissipation in that region. Therefore, the conversion efficiency of the wavelength conversion material in that region decreases, and thus the proportion of the central region in the emitted light is relatively lower compared to the emitted light with an ideal Lambertian light distribution. However, for the diffuser element 101, it changes the light distribution of the incident light in a non-excitation manner. Therefore, when the incident light power density increases, the diffuser element 101 does not significantly change the light distribution of the incident light. This results in the proportion of the central region of the third light returned by the wavelength conversion element 102 being smaller than the proportion of the edge region of the third light during mixing. In order to obtain white light during mixing, the proportion of the third light and the first light emitted by the diffuser element 101 is usually adjusted with the central region as a reference. Therefore, the proportion of the first light in the mixed light is usually reduced so that the central region of the mixed light is uniformly white. This, in turn, causes the proportion of the edge region of the first light in the mixed light to be smaller than the proportion of the edge region of the third light, thus exacerbating the yellowish phenomenon in the edge region of the mixed light.

[0050] In summary, the inventors, through research, discovered that previous research progress ( Figure 1 As shown in the figure, although the color uniformity of the emitted light can be improved to some extent by adding a diffusion element, the problem of lateral diffusion and reduced conversion efficiency in the central region during the process of the wavelength conversion element converting the incident light into laser emission was not anticipated in previous studies. Therefore, the actual mixed light still has a noticeable yellow halo, that is, the edge area of ​​the light spot is yellowish.

[0051] Based on this, the present application provides a light source device aimed at further eliminating the yellow halo in the edge region of the mixed light and improving the color uniformity of the mixed light. Figure 4 A schematic illustration of a light source device according to an embodiment of this application is shown. For example... Figure 4The light source device of the embodiment of the present application comprises: a first light emitting element 200 for emitting first light; a diffusion element 201 for expanding the divergence angle of the first light; a second light emitting element 202 for emitting second light; a wavelength conversion element 203 for converting at least part of the second light into third light with different wavelength range, wherein the third light has different wavelength range from the first light; a light combination element 204 receiving the first light from the diffusion element 201 and the third light from the wavelength conversion element 203, and guiding the first light and the third light towards the same direction to mix the first light and the third light to obtain white light; the light source device of the embodiment of the present application further comprises a compensation element 205 arranged between the first light emitting element 200 and the diffusion element 201 for expanding the divergence angle of the first light.

[0052] In the embodiment of the present application, the compensation element 205 is arranged between the first light emitting element 200 and the diffusion element 201, and the compensation element 205 expands the divergence angle of the first light, so that the first light emitted through the compensation element 205 gradually increases the spot size in the space between the compensation element 205 and the diffusion element 201, and thus the spot size of the first light emitted through the diffusion element 201 is larger than that of the first light emitted through the compensation element 205. Figure 1 In other words, the spot size of the first light incident on the diffusion element 201 is increased, so that the spot size of the first light emitted after the diffusion of the first light by the diffusion element 201 is also increased accordingly, thereby compensating for the difference in spot size caused by the lateral diffusion of the wavelength conversion element 203. On the other hand, since the light power density of the central region of the first light is higher than that of the edge region of the first light, the compensation element 205 expands the first light, so that the proportion of the central region dispersed to the edge region is higher than the proportion of the edge region dispersed to the more edge region, and thus the proportion of the central region of the first light is reduced overall in the light distribution region of the first light, and the proportion of the central region of the first light obtained after the diffusion of the first light by the diffusion element 201 is relatively reduced, thereby compensating for the difference caused by the decrease in the proportion of the central region due to the heat accumulation of the wavelength conversion element 203. Therefore, the light source device of the embodiment of the present application can effectively compensate for the color non-uniformity between the first light and the third light, and eliminate the yellow ring of the mixed light.

[0053] Referring to Figure 5 , a schematic diagram of the light path of the first light is shown. As Figure 5The first light emitted by the first light-emitting element 200, after passing through the compensation element 205, has an increased diffusion angle. Therefore, when the first light is incident on the diffusion element 201, the size of the light spot formed on the incident surface of the diffusion element 201 is significantly larger than the size of the light spot when the first light is incident on the compensation element 205. After passing through the diffusion element 201, the diffusion angle of the first light further increases. Finally, the size of the light spot formed by the first light on the light-emitting surface of the diffusion element 201 is basically the same as the size of the light spot formed on the light-emitting surface of the wavelength conversion element 203. Furthermore, the angular distribution of the first light on the light-emitting surface of the diffusion element 201 is basically the same as the angular distribution of the third light on the light-emitting surface of the wavelength conversion element 203. Therefore, when the first light and the third light are combined, a uniform white light can be obtained across the entire light spot area.

[0054] The first light-emitting element 200 and / or the second light-emitting element 202 may be selected as either a laser diode or a light-emitting diode. The first light emitted by the first light-emitting element 200 and / or the second light emitted by the second light-emitting element 202 may have a Gaussian distribution, with a significantly higher optical power density in the central region than in the surrounding region. The first and second lights may have the same wavelength range or different wavelength ranges. In some possible examples, the first and second lights may be selected as blue lasers, with the second light incident on the wavelength conversion element 203 and excited to be converted into a light source such as yellow laser light. Finally, the blue first light is mixed with the yellow light source returned by the wavelength conversion element 203 to obtain white mixed light.

[0055] The diffusion element 201 is, for example, selected as a diffusion sheet. Figure 4 and Figure 5 As shown, the diffusion element 201 can be configured to transmit the first light. The diffusion element 201 may include a substrate that can transmit the first light. To achieve diffusion of the first light, the incident and / or exit surfaces of the substrate can be provided with microstructures, which can be arranged regularly or irregularly on the incident and / or exit surfaces of the substrate. In some optional embodiments, scattering particles can also be distributed inside the substrate. These scattering particles can be configured to have refractive or reflective properties for the first light. When the first light is incident inside the substrate, it is repeatedly refracted or reflected by the scattering particles within the substrate, thus scattering the direction of the first light and achieving the purpose of diffusion. Whether it is a microstructure or scattering particles, the first light is diffused in a non-excitation manner. The size of the lateral diffusion of the first light produced by the diffusion element 201 is very limited, so the spot size on the exit surface of the diffusion element 201 will not increase significantly.

[0056] The wavelength conversion element 203 can include a wavelength conversion material layer. The wavelength conversion material layer 203 is configured to convert at least part of the second light into third light with a different wavelength range. The wavelength conversion material layer, for example, includes a matrix with wavelength conversion particles distributed therein. The matrix can be configured as a light-transmissive medium, i.e., the second light can be incident into the interior of the matrix, and the wavelength conversion particles can convert the second light incident into the matrix and emit the converted third light randomly in various directions. The matrix can include, but is not limited to, ceramic, glass, etc. The wavelength conversion particles can include, but are not limited to, (Sr,Ca)AlSiN3:Eu2+, YAG:Ce or LuAG:Ce. The wavelength conversion element 203 can be configured as a reflective element, i.e., the incident direction of the incident second light is opposite to the emission direction of the emitted third light, based on which the wavelength conversion material layer has an incident surface and an emission surface, wherein the incident surface and the emission surface are configured as the same surface of the wavelength conversion material layer, and the surface of the wavelength conversion material opposite to the incident surface and the emission surface can be connected with a reflective layer, which can reflect the third light traveling toward the reflective layer and emit the third light toward the emission surface of the wavelength conversion material layer. In some embodiments, the wavelength conversion element 203 can be configured as a transmissive element, i.e., the incident direction of the incident second light is the same as the emission direction of the emitted third light, based on which the incident surface and the emission surface of the wavelength conversion material layer are opposite to each other, and in order to improve the utilization efficiency of the third light, a selective transmission layer can be connected to the incident surface of the wavelength conversion material layer, which, for example, has the transmission property for the second light and the reflection property for the third light, thus the third light traveling toward the incident surface in the wavelength conversion material layer can be reflected by the selective transmission layer and emitted toward the emission surface of the wavelength conversion material layer.

[0057] The light combining element 204 can be configured as a selective transmission element, for example, the light combining element 204 can be configured to transmit the first light and the second light and reflect the third light. In the embodiment of the present application, the first light emitting element 200 and the second light emitting element 202 can be arranged on one side of the light combining element 204, wherein the light combining element 204 is arranged obliquely with respect to the first light emitting element 200 and the second light emitting element 202 respectively, the wavelength converting element 203 is arranged on the other side of the light combining element 204, and the light combining element 204 is arranged obliquely with respect to the wavelength converting element 203. The first light emitted from the first light emitting element 200 is finally transmitted through the light combining element 204, the second light emitted from the second light emitting element 202 is transmitted through the light combining element 204 and incident on the wavelength converting element 203, the third light returned from the wavelength converting element 203 is reflected by the light combining element 204 and mixed with the first light. The light combining element 204 can selectively transmit the first light and the second light and reflect the third light based on different wavelength ranges, different polarization states or different geometric distributions. Of course, in different embodiments, the light combining element 204 can also be configured to reflect the first light and the second light and transmit the third light.

[0058] The compensation element 205 is arranged between the first light emitting element 200 and the diffusion element 201. The compensation element 205 can be configured as an angle diffusion sheet, which has an angle diffusion property for the first light, changes the angular distribution of the first light by increasing the divergence angle of the first light, and in subsequent spatial propagation, the change of the angular distribution affects the area distribution of the light spot incident on the diffusion element 201, and affects the proportion of the light power density of the central region and the edge region in the first light.

[0059] In some embodiments of the present application, the diffusion angle range of the angle diffusion sheet can be selected to be 0.4 degrees to 5 degrees. When the diffusion angle range of the angle diffusion sheet is less than 0.4 degrees, the angle diffusion sheet has limited effect on the expansion of the emission angle of the first light, the light spot formed by the first light incident on the light-incident surface of the diffusion element 201 is smaller than the light spot formed by the third light on the light-incident surface of the wavelength conversion element 203, and when the diffusion angle of the angle diffusion sheet is less than 0.4 degrees, the relative proportion of the light power density of the central region of the first light decreases limitedly, and the relative proportion of the light power density of the surrounding region also increases limitedly, so the light spot area after the combination of the first light and the third light still has a certain degree of color non-uniformity. When the diffusion angle of the angle diffusion sheet is greater than 5 degrees, the angle diffusion sheet has a greater effect on the expansion of the emission angle of the first light, resulting in that the light spot of the first light on the diffusion element 201 is larger than the light spot of the third light on the light-incident surface of the wavelength conversion element 203, and the light power density of the central region of the first light decreases significantly, resulting in that the light spot after the combination of the first light and the third light also presents a certain degree of non-uniformity. When the diffusion angle range of the angle diffusion sheet is within the range of 0.4 degrees to 5 degrees, the first light is expanded in emission angle by the angle diffusion sheet, so that the light spot sizes of the first light and the third light are basically the same, and the relative proportions of the light power densities of the central region and the surrounding region of the first light are also basically the same as the relative proportions of the light power densities of the central region and the surrounding region of the third light, so the entire light spot area after the combination of the first light and the third light has good color uniformity.

[0060] In some embodiments of the present application, the compensation element 205 is configured as a transmission element. Specifically, the compensation element 205 includes a substrate having a transmission property to the first light. In some examples, the light-incident surface and / or the light-incident surface of the substrate are configured as microstructures for diffusing the first light. The microstructures can be selected to be regularly or irregularly arranged on the light-incident surface and / or the light-incident surface of the substrate. In some examples, the interior of the substrate can be provided with scattering particles, for example, having a reflection and / or refraction property to the first light. When the first light is incident on the substrate, the scattering particles distributed in the substrate change the direction of the first light one or more times, thereby diffusing the angle distribution of the first light.

[0061] With reference to Figure 6 The light source device of the embodiments of the present application further includes a first lens 206 and a second lens 207. The first lens 206 is arranged between the diffusion element 201 and the light combination element 204, and is used to collect or collimate the first light. The second lens 207 is used to converge the second light emitted from the second light-emitting element 202 to the wavelength conversion element 203, and to collect or collimate the third light returned by the wavelength conversion element 203. The first lens 206 and / or the second lens 207 can be selected as a single lens, or can be selected as at least two lenses in cascade.

[0062] With reference to the foregoing Figure 6 The light source device of the embodiments of the present application further comprises a third lens, which receives the mixed light from the light mixing element 204 and shapes the mixed light into a preset light spot and projects it out.

[0063] In some embodiments of the present application, the third lens comprises a first sub-lens 208 and a second sub-lens 209. The first sub-lens 208 is used to converge the mixed light. The mixed light converges to a focal position in front of the first sub-lens 208, and continues to travel forward with a certain divergence angle from the focal position. The second sub-lens 209 is arranged on the light path of the mixed light continuing to travel from the focal position. The second sub-lens 209 is used to collect, collimate or converge the mixed light. The distance between the second sub-lens 209 and the focal position in front of the first sub-lens 208 is different, resulting in different sizes of the light spot of the mixed light incident on the second sub-lens 209, so that by adjusting the different distances of the second sub-lens 209 relative to the focal position, the size of the projected light spot of the mixed light can be adjusted.

[0064] The light source device of the embodiments of the present application can be used in lighting or projection systems such as stage lights, searchlights, projectors, etc.

[0065] The embodiments of the present application also provide a lighting device comprising the light source device as described above.

[0066] The embodiments of the present application also provide a projection device comprising the light source device as described above.

[0067] In the description of the present application, the description of the terms "one embodiment", "certain embodiments", "exemplary embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present description, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] The above description is only the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A light source device, characterized in that, include: The first light-emitting element is used to emit the first light; A diffusion element is disposed in the optical path of the first light to diffuse the first light; The second light-emitting element is used to emit a second light; A wavelength conversion element is disposed in the optical path of the second light, for converting at least a portion of the second light into a third light with a different wavelength range, wherein the wavelength range of the first light is different from that of the third light; A light combining element is used to receive first light from the diffusion element and third light from the wavelength conversion element, and to combine the first light and the third light. as well as A compensation element is disposed between the first light-emitting element and the diffusion element, and the compensation element is used to diffuse the first light.

2. The light source device according to claim 1, characterized in that, The compensation element includes an angle diffuser.

3. The light source device according to claim 2, characterized in that, The angular diffusion range of the angular diffuser is 0.4 degrees to 5 degrees.

4. The light source device according to claim 1, characterized in that, The size of the light spot formed by the first light on the light-emitting surface of the diffusion element is basically the same as the size of the light spot formed by the third light on the light-emitting surface of the wavelength conversion element.

5. The light source device according to claim 1, characterized in that, The relative ratio of the optical power density in the central region to the optical power density in the edge region of the first light emitted through the diffusion element is basically consistent with the relative ratio of the optical power density in the central region to the optical power density in the edge region of the third light emitted through the wavelength conversion element.

6. The light source device according to claim 1, characterized in that, The first light and the second light have a Gaussian distribution.

7. The light source device according to claim 1, characterized in that, The third light includes a first laser beam and a second laser beam. The first laser beam forms a light spot R1 on the light-emitting surface of the wavelength conversion element, and the second laser beam forms a light spot R2 on the light-emitting surface of the wavelength conversion element. The size of the light spot R2 is larger than the size of the light spot R1, and the light spot R2 covers the light spot R1. The second laser beam is formed by lateral diffusion inside the wavelength conversion element.

8. The light source device according to claim 1, characterized in that, The compensation element includes a substrate, which is configured as a light-transmitting medium; The light-incident surface and / or light-exit surface of the substrate are provided with microstructures; and / or The interior of the matrix is ​​filled with scattering particles, which alter the direction of the first light in a non-excitation manner.

9. The light source device according to claim 1, characterized in that, The compensation element includes a substrate, which is configured as a light-transmitting medium; The light-incident surface and / or light-exit surface of the substrate are provided with microstructures; and / or The interior of the matrix is ​​filled with scattering particles, which change the direction of the first light by reflection and / or refraction.

10. The light source device according to claim 1, characterized in that, The first light-emitting element and / or the second light-emitting element include a laser diode.

11. A lighting system, characterized in that, Includes the light source device as described in any one of claims 1 to 10.

12. A projection system, characterized in that, Includes the light source device as described in any one of claims 1 to 10.

Images