LED unit, light combination module, light source device and optical imaging system

Abstract

The utility model discloses an LED unit, a light combination module, a light source device and an optical imaging system. The LED unit can comprise an LED chip, a fluorescent piece and a first dichroic piece. Wherein the LED chip is provided with a light-emitting surface, and the light-emitting surface is used for emitting specified light rays. The fluorescent part is arranged on a light path where the specified light is located and used for exciting the specified light D and then scattering the specified light D so as to generate scattering fluorescence. The first dichroic piece is located between the LED chip and the fluorescent piece and located on a light path where specified light rays are located, and the first dichroic piece is used for transmitting the specified light rays D and reflecting and scattering fluorescent light; the first dichroic sheet covers the light emitting surface. According to the LED unit, the first dichroic piece is arranged to cover the light emitting side of the LED chip, the effect of isolating high-frequency noise generated by the LED chip can be achieved, the noise reduction effect is achieved, and then the use experience of a user on the projection equipment provided with the LED unit is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and more specifically, to an LED unit, a light combining module, a light source device and an optical imaging system. Background Art

[0002] For projection equipment, the performance of its internal optical engine is an important factor affecting the quality of projection imaging. Among them, the most important factors affecting projection quality, including brightness and color, depend on the light source used by the optical engine.

[0003] At present, the main light source used in projection equipment is RGB laser light source, which has the advantage of wide color gamut. However, for projection equipment using small F-number lenses, RGB light source laser cannot provide obvious brightness gain. Therefore, in order to achieve the same light source brightness, the researchers proposed a hybrid light source of laser plus LED, which improves the imaging brightness of the projection equipment by adding RGB LED light source to the RGB laser light source.

[0004] However, due to the piezoelectric effect of the LED light source, harsh high-frequency noise is emitted when the LED is driven for lighting, which to a certain extent reduces the user experience of the projection device. Utility Model Content

[0005] The embodiments of the present application provide an LED unit, a light combining module, a light source device and an optical imaging system.

[0006] According to the first aspect of the present application, an embodiment of the present application provides an LED unit, which includes an LED chip, a fluorescent component and a first dichroic film. The LED chip is provided with a light emitting surface, and the light emitting surface is used to emit a specified light. The fluorescent component is arranged on the optical path where the specified light is located, and is used to excite and scatter the specified light to generate scattered fluorescence. The first dichroic film is located between the LED chip and the fluorescent component, and is located on the optical path where the specified light is located. The first dichroic film is used to transmit the specified light and reflect the scattered fluorescence; the first dichroic film covers the light emitting surface.

[0007] In some optional embodiments, the fluorescent component covers the side of the first dichroic plate facing away from the LED chip, and the fluorescent component is a fluorescent ceramic plate.

[0008] In some optional embodiments, the LED unit further includes a substrate, and the substrate, the first dichroic plate and the fluorescent member together define a sealed space; the LED chip is arranged in the sealed space.

[0009] According to the second aspect of the present application, the embodiment of the present application also provides a light combining module, which includes the above-mentioned LED unit, laser unit and a first light combining component. Among them, the LED unit is used to generate scattered fluorescence. The laser unit is used to generate a designated laser, and the designated laser and the scattered fluorescence are the same color. The first light combining component is arranged on the optical path where the designated laser and the scattered fluorescence are located, and is used to reflect the designated laser to the fluorescent component of the LED unit. After the designated laser passes through the fluorescent component, it is reflected by the first dichroic film of the LED unit, and is transmitted through the fluorescent component again to combine with the scattered fluorescence generated by the LED unit to generate the designated combined light.

[0010] Among them, in some optional embodiments, the projection area of ​​the first light combining component in the emission direction of the scattered fluorescence is smaller than the spot area of ​​the scattered fluorescence; the projection area of ​​the first light combining component in the emission direction of the designated laser is greater than or equal to the spot area of ​​the designated laser.

[0011] In some optional embodiments, the first light combining element is a reflective element; or the first light combining element is a second dichroic plate, and the second dichroic plate is used to reflect the designated laser and transmit at least part of the scattered fluorescence.

[0012] According to the third aspect of the present application, an embodiment of the present application further provides a light source device, which includes a plurality of the above-mentioned light combining modules, a second light combining component and a third light combining component. Among them, the plurality of light combining modules include a first light combining module, a second light combining module and a third light combining module; the first light combining module is used to generate a first designated light combining, the second light combining module is used to generate a second designated light combining, and the third light combining module is used to generate a third designated light combining, and the first designated light combining, the second designated light combining and the third designated light combining are different colors. The second light combining component is arranged on the optical path where the first designated light combining and the second designated light combining are located, and is used to perform wavelength combination on the first designated light combining and the second designated light combining to generate mixed light. The third light combining component is arranged on the optical path where the mixed light and the third designated light combining are located, and is used to perform wavelength combination on the mixed light and the third designated light combining to generate output light.

[0013] Among them, in some optional embodiments, the first designated light combination is red light, the second designated light combination is green light, and the third designated light combination is blue light; the fluorescent component in the first light combination module is a red fluorescent ceramic piece; the fluorescent component in the second light combination module is a green fluorescent ceramic piece; the fluorescent component in the third light combination module is a cyan fluorescent ceramic piece.

[0014] In some optional embodiments, at least two laser units in a plurality of light combining modules are integrated into the same laser module.

[0015] According to the fourth aspect of the present application, an embodiment of the present application further provides an optical imaging system, which includes the above-mentioned light source device and a light modulator. The light source device is used to generate outgoing light. The light modulator is arranged on the light path where the outgoing light is located.

[0016] The embodiment of the present application provides an LED unit, a light combining module, a light source device and an optical imaging system, wherein the LED unit may include an LED chip, a fluorescent component and a first dichroic film. The LED chip is provided with a light emitting surface, and the light emitting surface is used to emit a specified light. The fluorescent component is arranged on the optical path where the specified light is located, and is used to excite and scatter the specified light to generate scattered fluorescence.

[0017] The first dichroic sheet is located between the LED chip and the fluorescent component and on the optical path where the designated light is located. The first dichroic sheet is used to transmit the designated light and reflect the scattered fluorescence; the first dichroic sheet covers the light-emitting surface. For example, the first dichroic sheet can be attached to the side of the LED chip where the light-emitting surface is provided to cover the light-emitting surface. Therefore, by covering the light-emitting side of the LED chip with the first dichroic sheet, the high-frequency noise generated by the LED chip can be isolated, and the noise reduction effect can be achieved, thereby ensuring the user experience of the projection device provided with the LED unit.

[0018] In addition, when the designated light passes through the fluorescent element, part of the scattered fluorescence generated under the excitation of the fluorescent element will be reflected by the fluorescent particles in the fluorescent element back to the side where the LED chip is located, that is, part of the scattered fluorescence will be emitted along the fluorescent element toward the LED chip. Therefore, the first dichroic film between the LED chip and the fluorescent element can also reflect the above-mentioned part of the scattered fluorescence to the fluorescent element again, so as to improve the energy utilization efficiency of the scattered fluorescence generated by the LED unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the LED unit provided in the embodiment of the present application.

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of the LED chip in the LED unit.

[0022] Figure 3 yes Figure 1 Another structural schematic diagram of the LED unit.

[0023] Figure 4 It is a structural schematic diagram of a light combining module provided in an embodiment of the present application.

[0024] Figure 5 This is another structural schematic diagram of the light combining module provided in an embodiment of the present application.

[0025] Figure 6 This is another structural schematic diagram of the light combining module provided in the embodiment of the present application.

[0026] Figure 7 This is another structural schematic diagram of the light combining module provided in the embodiment of the present application.

[0027] Figure 8 It is a structural schematic diagram of a light source device provided in an embodiment of the present application.

[0028] Fig. 9 This is another structural schematic diagram of the light source device provided in an embodiment of the present application.

[0029] Fig.10 It is a schematic diagram of the structure of the optical imaging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0031] The present application provides an LED unit 10, which is a light source that emits light by releasing energy after electrons and holes recombine, and is widely used in the fields of lighting and display. For example, the LED unit 10 can be widely used in laser projection equipment (e.g., micro projectors, short-throw projectors, etc.), and as a supplementary light source in the above laser projection equipment.

[0032] See also Figure 1 and Figure 2The LED unit 10 may include an LED chip 101, a fluorescent element 105, and a first dichroic film 103. The LED chip 101 is provided with a light emitting surface 1010, and the light emitting surface 1010 is used to emit a specified light D. The fluorescent element 105 is arranged on the optical path where the specified light D is located, and is used to excite and scatter the specified light D to generate scattered fluorescence S. The first dichroic film 103 is located between the LED chip 101 and the fluorescent element 105, and is located on the optical path where the specified light D is located. The first dichroic film 103 is used to transmit the specified light D and reflect the scattered fluorescence S; the first dichroic film 103 covers the light emitting surface 1010.

[0033] Therefore, the present application sets a first dichroic film 103 through the LED unit 10 to cover the light-emitting side of the LED chip 101, which can isolate the high-frequency noise generated by the LED chip 101 and achieve a noise reduction effect, thereby ensuring the user's experience of using the projection device equipped with the LED unit 10.

[0034] In addition, when the designated light D passes through the fluorescent member 105, part of the scattered fluorescence S generated under the excitation of the fluorescent member 105 will be reflected by the fluorescent member 105 back to the side where the LED chip 101 is located, that is, part of the scattered fluorescence S will be emitted along the fluorescent member 105 toward the LED chip 101. Therefore, the first dichroic plate 103 between the LED chip 101 and the fluorescent member 105 can also reflect the above-mentioned part of the scattered fluorescence S to the fluorescent member 105 again, so as to improve the energy utilization efficiency of the scattered fluorescence S generated by the LED unit 10.

[0035] The specific structure of the LED unit 10 is introduced below.

[0036] In this embodiment, the LED chip 101 is used to generate a specified light D. The LED chip 101 may include a fixing plate (not shown in the figure) and a plurality of LED lamp beads (not shown in the figure), and the plurality of LED lamp beads may be integrated on the fixing plate to form a light emitting surface 1010 of the LED chip 101. Specifically, the plurality of LED lamp beads may be arranged in a square matrix of M*N, or may be arranged in a ring-shaped nested manner, which is not specifically limited in this embodiment.

[0037] Specifically, the LED lamp beads are dark blue LED lamp beads, that is, the designated light D is dark blue light. The wavelength of the designated light D may be between 400nm and 450nm.

[0038] In this embodiment, the first dichroic plate 103 is located between the LED chip 101 and the fluorescent element 105 and is located on the optical path of the designated light D. The first dichroic plate 103 is used to transmit the designated light D and reflect the scattered fluorescence S; the first dichroic plate 103 covers the light emitting surface 1010 .

[0039] As an implementation method, the first dichroic plate 103 can be attached to the side of the LED chip 101 provided with the light emitting surface 1010 to cover the light emitting surface 1010, thereby isolating the high-frequency noise generated by the LED chip 101 and achieving a noise reduction effect. In addition, fixing the first dichroic plate 103 and the LED unit 10 together can improve the assembly convenience of the LED unit 10. Specifically, the implementation method of the first dichroic plate 103 is introduced in the following embodiment.

[0040] In this embodiment, the fluorescent element 105 is disposed on the optical path of the designated light D after being transmitted through the first dichroic film 103 , and is used to excite and scatter the designated light D to generate scattered fluorescence S.

[0041] In some possible embodiments, see Figure 3 , the fluorescent member 105 covers the side of the first dichroic plate 103 away from the LED chip 101. At this time, the LED unit 10 and the fluorescent member 105 are respectively fixed on the opposite sides of the first dichroic plate 103. As an embodiment, the fluorescent member 105 can be attached to the side of the first dichroic plate 103 away from the LED chip 101, which can further isolate the high-frequency noise generated by the LED chip 101 and further reduce the noise. In addition, fixing the fluorescent member 105, the first dichroic plate 103 and the LED unit 10 together can improve the assembly convenience of the LED unit 10.

[0042] As an implementation, the fluorescent element 105 may be a fluorescent ceramic sheet 1050, in which a large number of fluorescent particles are doped. On the one hand, the fluorescent particles may scatter the light incident on the fluorescent ceramic sheet 1050. On the other hand, the designated light D may generate corresponding fluorescence under the excitation of the fluorescent particles, so that the scattered fluorescence S is emitted in the form of fluorescence. For example, when the fluorescent ceramic sheet 1050 is a red fluorescent ceramic sheet, the corresponding scattered fluorescence S is red fluorescence.

[0043] As another embodiment, the fluorescent member 105 can also be a fluorescent glue layer, which can be made by doping a large number of fluorescent particles in a viscous colloid. In this embodiment, the fluorescent glue layer can be directly coated on the side of the first dichroic plate 103 away from the LED chip 101 to improve the overall integration of the LED unit 10. In addition, compared with the implementation method using a fluorescent ceramic sheet, the fluorescent glue layer can further reduce the volume of the LED unit 10 to achieve a miniaturized design of the LED unit 10.

[0044] For some possible embodiments, please refer again to Figure 3The LED unit 10 may further include a substrate 107. The substrate 107, the first dichroic plate 103 and the fluorescent member 105 jointly define a sealed space 1070. The LED chip 10 is disposed in the sealed space 1070. Since the present embodiment arranges the LED unit 101 in the sealed space 1070, a better noise reduction effect can be achieved. Specifically, the LED unit 10 in the present embodiment may be a crystal lamp bead, which may be disposed on the substrate 107, for example, by welding on the substrate 107 through a welding process.

[0045] As an implementation, the substrate 107 may be provided with a mounting cavity (not shown in the figure), the mounting cavity forms an opening (not shown in the figure) on one side of the substrate 107, and the LED chip 101 is disposed in the mounting cavity. In some examples, the first dichroic plate 103 may cover the opening to define a sealed space 1070 together with the substrate 107. In other examples, the fluorescent member 105 is a fluorescent ceramic plate 1050, the fluorescent ceramic plate 1050 covers the opening to define a sealed space 1070 together with the substrate 107, and the LED chip 101 and the first dichroic plate 103 are disposed in the sealed space 1070.

[0046] As another embodiment, the fluorescent member 105 may be a fluorescent adhesive layer. After the first dichroic film 103 is attached to the side of the substrate 107 where the LED chip 101 is disposed, a fluorescent adhesive layer is coated on the side of the first dichroic film 103 away from the substrate 107 , and the fluorescent adhesive layer and the substrate 107 together form a sealed space 1070 .

[0047] Here combined Figures 4 to 6 The specific implementation of the first dichroic plate 103 and the fluorescent element 105 in the LED unit 10 is introduced.

[0048] exist Figure 4 In the illustrated embodiment, the LED unit 10 may be a first LED unit 110, and the first LED unit 110 may include a first LED chip 1012, a first fluorescent element 1052, and a first sub-dichroic plate 1032. The designated light D generated by the first LED chip 1012 is dark blue light, and the first fluorescent element 1052 is a red fluorescent ceramic plate, so that the first scattered fluorescence S1 generated by the designated light D generated by the first LED chip 1012 under the excitation of the red fluorescent ceramic plate is red fluorescence. In this case, the first sub-dichroic plate 1032 may be a blue-transmitting and red-reflecting film, which may transmit the designated light D generated by the first LED chip 1012 and reflect part of the first scattered fluorescence S1 incident on the first sub-dichroic plate 1032.

[0049] Other technical features of the first LED chip 1012, the first fluorescent component 1052 and the first sub-dichroic film 1032 can refer to and follow the features of the LED chip 101, the fluorescent component 105 and the first dichroic film 103 in the above embodiments respectively, and will not be described here one by one to save space.

[0050] exist Figure 5 In the illustrated embodiment, the LED unit 10 may be a second LED unit 130, and the second LED unit 130 may include a second LED chip 1014, a second fluorescent element 1054, and a second sub-dichroic plate 1034. The designated light D generated by the second LED chip 1014 is dark blue light, and the second fluorescent element 1054 is a green fluorescent ceramic plate, so that the designated light D generated by the second LED chip 1014 is excited by the green fluorescent ceramic plate and generates a second scattered fluorescent light S2 of green fluorescence. In this case, the second sub-dichroic plate 1034 may be a blue-transmitting and green-reflecting film, which may transmit the designated light D generated by the second LED chip 1014 and reflect a portion of the second scattered fluorescent light S2 incident on the second sub-dichroic plate 1034.

[0051] Other technical features of the second LED chip 1014, the second fluorescent component 1054 and the second sub-dichroic film 1034 can refer to and follow the features of the LED chip 101, the fluorescent component 105 and the first dichroic film 103 in the above embodiments respectively, and will not be described here one by one to save space.

[0052] exist Figure 6 In the illustrated embodiment, the LED unit 10 may be a third LED unit 150, which may include a third LED chip 1016, a third fluorescent element 1056, and a third sub-dichroic film 1036. The designated light D generated by the third LED chip 1016 is dark blue light.

[0053] In some possible embodiments, the third fluorescent element 1056 may be a cyan fluorescent ceramic sheet, so that the third scattered fluorescent light S3 generated by the designated light D generated by the third LED chip 1016 under the excitation of the cyan fluorescent ceramic sheet is cyan fluorescent light. Specifically, the cyan fluorescent ceramic sheet is doped with a large number of cyan fluorescent particles, and the wavelength of the cyan fluorescent light may be between 450nm and 500nm.

[0054] In this case, the third sub-dichroic film 1036 may be a blue-transmitting, cyan-reflecting film, which may transmit the designated light D generated by the third LED chip 1016 and reflect a portion of the third scattered fluorescence S3 incident on the third sub-dichroic film 1036. Specifically, the blue-transmitting, cyan-reflecting film may be used to transmit light with a wavelength less than or equal to 445 nm and reflect light with a wavelength greater than or equal to 460 nm.

[0055] In some possible embodiments, the cyan fluorescent ceramic sheet can be a thinner ceramic sheet, or the concentration of cyan fluorescent particles in the cyan fluorescent ceramic sheet is lower, so that a portion of the designated light D incident on the cyan fluorescent ceramic sheet produces cyan fluorescence under the excitation of the cyan fluorescent particles, while another portion of the designated light D can be transmitted through the cyan fluorescent ceramic sheet, so that the third scattered fluorescence S3 is a mixture of cyan fluorescence and dark blue light, thereby ensuring that when the third scattered fluorescence S3 and the blue laser need to be combined, the blue light generated after the combination will not be color cast.

[0056] Other technical features of the third LED chip 1016, the third fluorescent component 1056 and the third sub-dichroic film 1036 can refer to and follow the features of the LED chip 101, the fluorescent component 105 and the first dichroic film 103 in the above embodiments respectively, and will not be described here one by one to save space.

[0057] In some other possible embodiments, Figure 6 In the illustrated embodiment, the third fluorescent member 1056 can be replaced by a diffusion sheet. In this case, the designated light D generated by the third LED chip 1016 is directly scattered by the diffusion sheet and then emitted to form deep blue scattered light.

[0058] The embodiment of the present application also provides a light combining module 20, which is a hybrid light source formed by combining a laser light source and an LED light source. The light combining module 20 has the advantages of high light source brightness, simple optical path and low hardware cost, and can be widely used in laser projection equipment (for example, micro projectors, short-focus projectors), laser TVs, engineering projectors, laser splicing walls and other equipment.

[0059] See also Figure 7 , the light combining module 20 may include the above-mentioned LED unit 10, the laser unit 201 and the first light combining component 203. Among them, the LED unit 10 is used to generate scattered fluorescence S. The laser unit 201 is used to generate a specified laser L, and the specified laser L and the scattered fluorescence S are the same color. The "same color" here can be understood as: the wavelength range of the specified laser L and the wavelength range of the scattered fluorescence S are both in the wavelength range of light of the same color. For example, the wavelength range of the specified laser L and the wavelength range of the scattered fluorescence S are both in the wavelength range of red light, that is, 625nm to 740nm.

[0060] The first light combining element 203 is arranged on the optical path where the designated laser L and the scattered fluorescence S are located, and is used to reflect the designated laser L to the fluorescent element 105 of the LED unit 10. After the designated laser L passes through the fluorescent element 105, it is reflected by the first dichroic film 103 of the LED unit 10, and passes through the fluorescent element 105 again to combine with the scattered fluorescence S generated by the LED unit 10 to generate the designated combined light H.

[0061] It is not difficult to understand here that since the first dichroic plate 103 of the LED unit 10 can be used to reflect the scattered fluorescence S, and the scattered fluorescence S is the same color as the designated laser L. Therefore, the first dichroic plate 103 in this embodiment can also reflect the designated laser L. In the process of the designated laser L being reflected by the first light combining component 203 to the first dichroic plate 103, and in the process of being reflected again by the first dichroic plate 103, it will pass through the fluorescent component 105 once respectively. The designated laser L will be scattered by the fluorescent component 105 twice before being combined with the scattered fluorescence S, thereby fully eliminating the coherence of the designated laser L, thereby avoiding the speckle effect, so as to ensure the imaging quality of the projection device provided with the light combining module 20.

[0062] In addition, the light combining module 20 in this embodiment multiplexes the fluorescent element 105 of the LED unit 10 to eliminate the coherence of the specified laser L. Therefore, there is no need to set up additional speckle elimination devices (for example, scattering wheels, scattering sheets, etc.) in the light combining module 20, which can reduce the hardware cost of the light combining module 20 and make the overall optical path structure of the light combining module 20 more compact.

[0063] In some possible embodiments, the projection area of ​​the first light combining component 203 in the emission direction X of the scattered fluorescence S is smaller than the spot area of ​​the scattered fluorescence S, so as to ensure that a portion of the designated light H will not be blocked by the first light combining component 203, so as to smoothly participate in the subsequent light combining. Of course, another portion of the designated light H will be incident on the position where the first light combining component 203 is located, and then reflected by the first light combining component 203, resulting in the inability to participate in the subsequent light combining.

[0064] In some possible embodiments, the projection area of ​​the first light combining component 203 in the emission direction Y of the designated laser L is greater than or equal to the spot area of ​​the designated laser L, so as to ensure that the designated laser L emitted from the laser unit 201 can be fully reflected by the first light combining component 203 to the fluorescent component 105 of the LED unit 10, thereby ensuring the energy utilization efficiency of the designated laser L.

[0065] It is not difficult to understand here that due to the scattering effect of the fluorescent component 105 on the designated laser light L, when the designated laser light L after being scattered twice by the fluorescent component 105 is incident on the first light combining component 203 again, the expansion amount of the designated laser light L after being scattered twice will be much greater than the expansion amount of the designated laser light L emitted from the laser unit 201. Therefore, part of the light in the designated laser light L after being scattered twice will not be blocked by the first light combining component 203, so as to smoothly participate in the subsequent light combining.

[0066] As an implementation manner, the first light combining element 203 may be a reflective element 2030 , for example, the reflective element 2030 may be a reflector.

[0067] As another embodiment, the first light combining component 203 may be a second dichroic plate 2035, and the second dichroic plate 2035 is used to reflect the designated laser L and transmit at least part of the scattered fluorescence S. Specifically, the second dichroic plate 2035 may be coated with a film layer that reflects the designated laser L and transmits the scattered fluorescence S and the designated laser L whose spectra do not overlap, so that at least part of the scattered fluorescence S can be transmitted through the first light combining component 203 to participate in the subsequent light combining, thereby improving the energy utilization efficiency of the designated light combining H. Specifically, taking the scattered fluorescence S and the designated laser L as red light as an example, the wavelength of the designated laser L may be between 645nm and 655nm, and the wavelength of the scattered fluorescence S may be between 625nm and 740nm. In this case, the first light combining component 203 is coated with a film layer with a reflection wavelength greater than or equal to 645nm and a transmission wavelength less than 645nm, so that the scattered fluorescence S with a wavelength of 625nm to 645nm can be smoothly transmitted through the first light combining component 203 to participate in the subsequent light combining.

[0068] In some possible embodiments, the light combining module 20 may further include a collecting unit 205, which is disposed between the LED unit 10 and the first light combining component 203 and is located on the optical path of the scattered fluorescence S generated by the LED unit 10, and is used to collect the scattered fluorescence S to improve the energy utilization efficiency of the scattered fluorescence S.

[0069] Specifically, the collecting unit 205 may include one or more collecting lenses, and the one or more collecting lenses are arranged on the optical path where the scattered fluorescence S is located. Figure 7 In the illustrated embodiment, there are two collecting lenses, namely a first collecting lens 2052 and a second collecting lens 2054. The first collecting lens 2052 and the second collecting lens 2054 are sequentially arranged at intervals along the optical path of the scattered fluorescence S to improve the energy utilization efficiency of the scattered fluorescence S. As an implementation method, the first collecting lens 2052 and the second collecting lens 2054 can be positive lenses respectively.

[0070] Here again combined Figures 4 to 6 The specific implementation of the laser unit 201 and the first light combining component 203 in the light combining module 20 is introduced.

[0071] exist Figure 4In the illustrated embodiment, the light combining module 20 may be a first light combining module 210, and the first light combining module 210 may include a first LED unit 110, a first laser unit 2012, and a first sub-light combining component 2032. The first scattered fluorescence S1 generated by the first LED unit 110 is red fluorescence. The first laser unit 2012 is used to generate a first designated laser L1, and the first designated laser L1 is a red laser. Therefore, the first designated combined light H1 generated by combining the first scattered fluorescence S1 and the first designated laser L1 is red light.

[0072] In this case, the first sub-light combining element 2032 can be a reflective element or a fourth sub-dichroic plate. The fourth sub-dichroic plate can be coated with a film layer that reflects red laser light and transmits red fluorescence and a shorter wavelength band of the red laser light whose spectra do not overlap, so that part of the red fluorescence can be transmitted through the fourth sub-dichroic plate to participate in subsequent light combining, thereby improving the energy utilization efficiency of the first designated light combining H1.

[0073] Other technical features of the first laser unit 2012 and the first sub-light combining element 2032 can refer to and follow the features of the laser unit 201 and the first light combining element 203 in the above embodiments respectively, and will not be described one by one here to save space.

[0074] exist Figure 5 In the illustrated embodiment, the light combining module 20 may be a second light combining module 230, and the second light combining module 230 may include a second LED unit 130, a second laser unit 2014, and a second sub-light combining component 2034. The second scattered fluorescence S2 generated by the second LED unit 130 is green fluorescence. The second laser unit 2014 is used to generate a second designated laser L2, and the second designated laser L2 is a green laser. Therefore, the second designated combined light H2 generated by combining the second scattered fluorescence S2 and the second designated laser L2 is green light.

[0075] In this case, the second sub-light combining element 2034 can be a reflective element or a fifth sub-dichroic plate. The fifth sub-dichroic plate can be coated with a film layer that reflects green laser light and transmits green fluorescence and a longer wavelength band of green laser light whose spectra do not overlap, so that part of the green fluorescence can be transmitted through the fifth sub-dichroic plate to participate in subsequent light combining, thereby improving the energy utilization efficiency of the second designated light combining H2.

[0076] Other technical features of the second laser unit 2014 and the second sub-light combining component 2034 can refer to and follow the features of the laser unit 201 and the first light combining component 203 in the above embodiments respectively, and will not be described here one by one to save space.

[0077] exist Figure 6In the illustrated embodiment, the light combining module 20 may be a third light combining module 250, and the third light combining module 250 may include a third LED unit 150, a third laser unit 2016, and a third sub-light combining component 2036. Among them, the third scattered fluorescence S2 generated by the third LED unit 150 is cyan fluorescence. The third laser unit 2016 is used to generate a third designated laser L3, and the third designated laser L3 is a blue laser. Therefore, the third designated combined light H3 generated by combining the third scattered fluorescence S3 and the third designated laser L3 is blue light.

[0078] In this case, the third sub-light combining element 2036 can be a reflective element or a sixth sub-dichroic plate. The sixth sub-dichroic plate can be coated with a film layer that reflects blue laser light and transmits cyan fluorescence and a longer wavelength band of blue laser light whose spectra do not overlap, so that part of the cyan fluorescence can be transmitted through the sixth sub-dichroic plate to participate in subsequent light combining, thereby improving the energy utilization efficiency of the third designated light combining H3.

[0079] Other technical features of the third laser unit 2016 and the third sub-light combining element 2036 can refer to and follow the features of the laser unit 201 and the first light combining element 203 in the above embodiments respectively, and will not be described one by one here to save space.

[0080] The embodiment of the present application also provides a light source device 30, which is a hybrid light source formed by combining a laser light source and an LED light source. The light source device 30 has the advantages of high light source brightness, simple optical path and low hardware cost. It can be widely used in laser projection equipment (for example, micro projectors, short-focus projectors), laser TVs, engineering projectors, laser mosaic walls and other equipment.

[0081] See also Figure 8 , the light source device 30 may include a plurality of the above-mentioned light combining modules 20, a second light combining component 320 and a third light combining component 340. The plurality of light combining modules 20 include a first light combining module 210, a second light combining module 230 and a third light combining module 250. The first light combining module 210 is used to generate a first designated light combining H1, the second light combining module 230 is used to generate a second designated light combining H2, the third light combining module 250 is used to generate a third designated light combining H3, and the first designated light combining H1, the second designated light combining H2 and the third designated light combining H3 are different colors.

[0082] The second light combining component 320 is disposed on the optical path where the first designated light combining component H1 and the second designated light combining component H2 are located, and is used to perform wavelength combining on the first designated light combining component H1 and the second designated light combining component H2 to generate mixed light H12. For example, the second light combining component 320 may be a first designated dichroic plate, which may be used to reflect the first designated light combining component H1 and transmit the second designated light combining component H2, or may be used to transmit the first designated light combining component H1 and reflect the second designated light combining component H2 to generate mixed light H12.

[0083] The third light combining element 340 is disposed on the optical path where the mixed light H12 and the third designated combined light H3 are located, and is used to perform wavelength combination on the mixed light H12 and the third designated combined light H3 to generate the output light O. For example, the third light combining element 340 may be a second designated dichroic plate, and the second designated dichroic plate may be used to reflect the mixed light H12 and transmit the third designated combined light H3, or may be used to transmit the mixed light H12 and reflect the third designated combined light H3 to generate the output light O.

[0084] In some possible embodiments, the first designated light combination H1 is red light, the second designated light combination H2 is green light, and the third designated light combination H3 is blue light. Therefore, the output light O in this embodiment is a three-color mixed light of red, green and blue. Specifically, the fluorescent component in the first light combination module 210 (that is, the first fluorescent component 1052) is a red fluorescent ceramic piece; the fluorescent component in the second light combination module 230 (that is, the second fluorescent component 1054) is a green fluorescent ceramic piece; the fluorescent component in the third light combination module 250 (that is, the third fluorescent component 1056) is a cyan fluorescent ceramic piece. For the specific implementation methods of the first light combination module 210, the second light combination module 230 and the third light combination module 250, please refer to the relevant introduction in the above embodiments, which will not be repeated here.

[0085] Specifically, when the first designated light combination H1 is red light, the second designated light combination H2 is green light, and the third designated light combination H3 is blue light, the second light combination component 320 may be a film that transmits red and reflects green, and the third light combination component 340 may be a film that transmits yellow and reflects blue, or a film that transmits red, green, and reflects blue.

[0086] In some possible embodiments, the light source device 30 may further include a converging lens 360, which is disposed between the second light combining member 320 and the third light combining member 340 and is located on the optical path of the mixed light H12, and is used to converge and collect the mixed light H12 to ensure the energy utilization efficiency of the mixed light H12. Specifically, the converging lens 360 may be a positive lens, and the number of the converging lenses 360 may be one or more, which is not specifically limited in this embodiment.

[0087] In some possible embodiments, at least two laser units 201 in the plurality of light combining modules 20 may be integrated into the same laser module 380 to improve the integration of the laser units 201. In addition, by integrating at least two laser units 201 together, the heat dissipation of at least two laser units 201 may be achieved simultaneously to improve the heat dissipation efficiency.

[0088] In the case where the plurality of light combining modules 20 include the first light combining module 210, the second light combining module 230 and the third light combining module 250, the first laser unit 2012 in the first light combining module 210, the second laser unit 2014 in the second light combining module 230 and the third laser unit 2016 in the third light combining module 250 may be integrated into the same laser module 380. Alternatively, any two laser units 201 among the first laser unit 2012, the second laser unit 2014 and the third laser unit 2016 are integrated into the same laser module 380, and the specific integration method of the laser unit 201 is not specifically limited in the present application.

[0089] See also Fig. 9 , the first laser unit 2012, the second laser unit 2014 and the third laser unit 2016 are integrated in the same laser module 380, that is, the laser module 380 is a three-color laser module. Fig. 9 In the illustrated embodiment, the light source device 30 may further include a third designated dichroic plate 390 and a reflector 395, wherein the reflector 395 is disposed on the optical path of the third designated laser L3 generated by the third laser unit 2016, and is used to reflect the third designated laser L3 to the third sub-light combining component 2036. The third designated dichroic plate 390 is disposed on the optical path of the second designated laser L2 generated by the second laser unit 2014, and is used to reflect the second designated laser L2 to the second sub-light combining component 2034.

[0090] also, Fig. 9 The third designated dichroic plate 390 and the second sub-light combiner 2034 in the illustrated embodiment are also sequentially arranged on the optical path of the third designated laser L3 after being reflected by the reflector 395, and the third designated dichroic plate 390 and the second sub-light combiner 2034 are respectively used to transmit the third designated laser L3 to the third sub-light combiner 2036. Through the above optical path structure, the embodiment can make the overall optical path of the light source device 30 more compact and reasonable, which is conducive to the miniaturization design of the projection device equipped with the light source device 30.

[0091] See also Fig.10The present application also provides an optical imaging system 40, which is provided with the above-mentioned light source device 30, and can be widely used in laser projection equipment (for example, micro projectors, short-throw projectors), laser televisions, engineering projectors, laser mosaic walls and other equipment. Fig.10 In the illustrated embodiment, the optical imaging system 40 may include the aforementioned light source device 30 , a relay module 410 , a prism module 420 , and a light modulator 430 .

[0092] The light source device 30 is used to generate the outgoing light O. The specific structure of the light source device 30 can refer to the relevant description in the above embodiment. The relay module 410 is arranged on the optical path where the outgoing light O is located, and plays a role in converging the outgoing light O. Specifically, the relay module 410 may include a single lens or a lens group composed of multiple lenses. Fig.10 In the illustrated embodiment, the relay module 410 may include a first lens 4140 and a second lens 4160. The first lens 4140 and the second lens 4160 are sequentially arranged on the optical path of the outgoing light O, and the first lens 4140 and the second lens 4160 respectively converge the outgoing light O to improve the energy utilization efficiency of the outgoing light O. Specifically, the first lens 4140 and the second lens 4160 may be positive lenses, respectively.

[0093] exist Fig.10 In the illustrated embodiment, the relay module 410 may further include a light homogenizer 4120, which is disposed between the light source device 30 and the first lens 4140 and is located on the optical path of the outgoing light O, and plays a role in homogenizing the outgoing light O, so as to make the outgoing light O more uniform, thereby improving the imaging effect of the optical imaging system 40. Specifically, the light homogenizer 4120 may be a light homogenizer rod or a compound eye lens.

[0094] The prism module 420 is disposed between the lens module 410 and the light modulator 430, and is used to reflect the outgoing light O and focus it onto the light modulator 430. The light modulator 430 is used to perform image modulation on the light and form light carrying image information. The prism module 420 is also used to transmit the light carrying image information to the projection area, such as a wall, a projection screen, and the like.

[0095] Specifically, the light modulator 430 can be a digital micromirror device (DMD), which is composed of a digital micromirror array, each digital micromirror constitutes a modulation unit, and a modulation unit is used to modulate the image corresponding to a pixel. Each digital micromirror is flipped under the drive of the driving signal generated by the control device, and the number of flips of each digital micromirror is determined by the driving signal. The flipped digital micromirror modulates the light reflected by the prism module 420 and forms light carrying image information. In some other possible embodiments, the light modulator 430 can also be a HTPSLCD display chip, a reflective LCD device LCOS, etc. This embodiment does not limit the specific implementation method of the light modulator 430.

[0096] The present embodiment provides an LED unit 10, a light combining module 20, a light source device 30 and an optical imaging system 40. The LED unit 10 may include an LED chip 101, a fluorescent component 105 and a first dichroic film 103. The LED chip 101 is provided with a light emitting surface 1010, and the light emitting surface 1010 is used to emit a specified light D. The fluorescent component 105 is arranged on the optical path where the specified light D is located, and is used to excite and scatter the specified light D to generate scattered fluorescence S. The first dichroic film 103 is located between the LED chip 101 and the fluorescent component 105, and is located on the optical path where the specified light D is located. The first dichroic film 103 is used to transmit the specified light D and reflect the scattered fluorescence S; the first dichroic film 103 covers the light emitting surface 1010.

[0097] Therefore, the present application sets a first dichroic film 103 through the LED unit 10 to cover the light-emitting side of the LED chip 101, which can isolate the high-frequency noise generated by the LED chip 101 and achieve a noise reduction effect, thereby ensuring the user's experience of using the projection device equipped with the LED unit 10.

[0098] In addition, when the designated light passes through the fluorescent element 105, part of the scattered fluorescence S generated under the excitation of the fluorescent element 105 will be reflected by the fluorescent element 105 back to the side where the LED chip 101 is located, that is, part of the scattered fluorescence S will be emitted along the fluorescent element 105 toward the LED chip 101. Therefore, the first dichroic plate 103 between the LED chip 101 and the fluorescent element 105 can also reflect the above-mentioned part of the scattered fluorescence S to the fluorescent element 105 again, so as to improve the energy utilization efficiency of the scattered fluorescence S generated by the LED unit 10.

[0099] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0100] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0101] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An LED unit, characterized in that: include: The LED chip is provided with a light emitting surface, and the light emitting surface is used to emit a specified light; A fluorescent element, arranged on the optical path of the designated light, for exciting and post-scattering the designated light to generate scattered fluorescence; as well as The first dichroic plate is located between the LED chip and the fluorescent component and on the optical path of the designated light. The first dichroic plate is used to transmit the designated light and reflect the scattered fluorescence. The first dichroic plate covers the light emitting surface.

2. The LED unit according to claim 1, characterized in that: The fluorescent component covers a side of the first dichroic plate away from the LED chip, and the fluorescent component is a fluorescent ceramic plate.

3. The LED unit according to claim 1, characterized in that: The LED unit further comprises a substrate, wherein the substrate, the first dichroic plate and the fluorescent element jointly define a sealed space; The LED chip is arranged in the sealed space.

4. A light combining module, characterized in that: include: The LED unit according to any one of claims 1 to 3, wherein the LED unit is used to generate scattered fluorescent light; A laser unit, used for generating a designated laser, wherein the designated laser has the same color as the scattered fluorescence; as well as A first light combining component is arranged on the optical path where the designated laser and the scattered fluorescence are located, and is used to reflect the designated laser to the fluorescent component of the LED unit. After the designated laser passes through the fluorescent component, it is reflected by the first dichroic film of the LED unit and passes through the fluorescent component again to combine with the scattered fluorescence generated by the LED unit to generate designated combined light.

5. The light combining module according to claim 4, characterized in that: The projection area of ​​the first light combining element in the emission direction of the scattered fluorescence is smaller than the spot area of ​​the scattered fluorescence; The projection area of ​​the first light combining element in the emission direction of the designated laser is greater than or equal to the spot area of ​​the designated laser.

6. The light combining module according to claim 4, characterized in that: The first light combining element is a reflective element; or The first light combining element is a second dichroic plate, and the second dichroic plate is used for reflecting the designated laser and transmitting at least a part of the scattered fluorescence.

7. A light source device, characterized in that: include: A plurality of light combining modules as claimed in any one of claims 4 to 6, wherein the plurality of light combining modules comprises a first light combining module, a second light combining module and a third light combining module; The first light combining module is used to generate a first designated light combining module, the second light combining module is used to generate a second designated light combining module, and the third light combining module is used to generate a third designated light combining module, and the first designated light combining module, the second designated light combining module and the third designated light combining module are of different colors; A second light combining element is disposed on the optical path where the first designated light combining element and the second designated light combining element are located, and is used to perform wavelength combining on the first designated light combining element and the second designated light combining element to generate mixed light; as well as The third light combining element is arranged on the optical path of the mixed light and the third designated combined light, and is used for performing wavelength combination on the mixed light and the third designated combined light to generate output light.

8. The light source device according to claim 7, characterized in that: The first designated combined light is red light, the second designated combined light is green light, and the third designated combined light is blue light; The fluorescent component in the first light combining module is a red fluorescent ceramic plate; the fluorescent component in the second light combining module is a green fluorescent ceramic plate; and the fluorescent component in the third light combining module is a cyan fluorescent ceramic plate.

9. The light source device according to claim 7, characterized in that: At least two laser units in the plurality of light combining modules are integrated into the same laser module.

10. An optical imaging system, characterized in that: include: The light source device according to any one of claims 7 to 9, wherein the light source device is used to generate output light; as well as The optical modulator is arranged on the optical path where the outgoing light is located.

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