Light source device

Abstract

The utility model relates to the technical field of projection equipment, in particular to a light source device which comprises a narrow-spectrum light source, a wide-spectrum light source and a first light combining element, narrow-spectrum light beams emitted by the narrow-spectrum light source and wide-spectrum light beams emitted by the wide-spectrum light source are combined and emitted through the first light combining element, and overlapping wavebands exist between the narrow-spectrum light beams and the wide-spectrum light beams. The first light combining element reflects one of the light in the first polarization state of the overlapped wave band and the light in the second polarization state of the overlapped wave band while carrying out wavelength light combining, and transmits the other one of the light in the first polarization state of the overlapped wave band and the light in the second polarization state of the overlapped wave band. According to the utility model, the light loss during light combination when the wide-spectrum light beam and the narrow-spectrum light beam have overlapped wavebands is reduced, the utilization rate of the wide-spectrum light beam is improved, the light-emitting brightness is more effectively improved, high brightness, high color gamut and good comprehensive performance are realized, and the quality of a projection picture is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of projection equipment, in particular to a light source device. Background Art

[0002] The light source device is an important component of the projection equipment. At present, the commonly used light sources of the light source device include LED light sources, laser light sources and fluorescent excitation light sources, which show excellent characteristics in terms of brightness, color, life, energy consumption, etc. However, these types of light sources also have their own defects. LED light sources are difficult to achieve high brightness and high color gamut, and may bring the disadvantage of a large system volume; although the laser light source is superior to the LED system in brightness and color gamut, there is a speckle problem because the laser has a strong coherence, which makes the human eye feel that there are densely packed small particles on the screen when watching a movie, and it is difficult to obtain a relatively ideal picture quality; the fluorescent excitation light source has a low excitation conversion efficiency and is greatly affected by temperature. When the temperature of the fluorescent substance rises, the excitation conversion efficiency will be seriously reduced, affecting the overall light output brightness.

[0003] Laser light sources are usually narrow-spectrum light sources, while LED light sources and fluorescent excitation light sources are broad-spectrum light sources. In order to improve the light output quality, narrow-spectrum light sources and broad-spectrum light sources are often mixed for output, which is beneficial for improving light output brightness, optimizing speckle problems, etc. However, the light emitted by narrow-spectrum light sources and the light emitted by broad-spectrum light sources often have overlapping wavelengths, which will be lost when the light is combined, resulting in low light combining efficiency, which limits the improvement of the overall light output brightness of the light source device. Utility Model Content

[0004] The technical problem to be solved and the technical task proposed by the utility model are to improve the existing technology and provide a light source device to solve the problem that the light source device in the current technology has large light loss and low light combining efficiency when mixing narrow-spectrum light sources and wide-spectrum light sources for output.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A light source device comprises a narrow spectrum light source, a wide spectrum light source and a first light combining element, wherein a narrow spectrum light beam emitted by the narrow spectrum light source and a wide spectrum light beam emitted by the wide spectrum light source are emitted to the first light combining element to be combined and emitted, the narrow spectrum light beam emitted by the narrow spectrum light source and the wide spectrum light beam emitted by the wide spectrum light source have an overlapping wavelength band, and the narrow spectrum light beam emitted by the narrow spectrum light source comprises light of a first polarization state in the overlapping wavelength band;

[0007] The first light combining element transmits the narrow spectrum light beam emitted by the narrow spectrum light source, and reflects the light of the second polarization state of the overlapping band and the light of the remaining bands in the wide spectrum light beam emitted by the wide spectrum light source excluding the overlapping band; or, the first light combining element reflects the narrow spectrum light beam emitted by the narrow spectrum light source, and transmits the light of the second polarization state of the overlapping band and the light of the remaining bands in the wide spectrum light beam emitted by the wide spectrum light source excluding the overlapping band.

[0008] Furthermore, it also includes a first homogenizing element arranged on the optical path of the narrow spectrum light beam emitted by the narrow spectrum light source, the narrow spectrum light beam emitted by the narrow spectrum light source has a rectangular or elliptical spot, the first homogenizing element homogenizes the narrow spectrum light beam, and adjusts the spot shape of the incident narrow spectrum light beam to a regular polygon or a rectangle with unequal length and width, wherein the long side of the spot of the narrow spectrum light beam incident on the first rectangular incident surface of the first homogenizing element is parallel to the long side of the first rectangular incident surface.

[0009] Furthermore, it also includes a second lens unit, which is located on the optical path of the narrow-spectrum light beam emitted by the first light homogenizing element and is used to reduce the divergence angle of the incident narrow-spectrum light beam. The second light homogenizing element is arranged on the light path of the light combining element, and the second lens unit makes the spot size of the narrow-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element smaller than or equal to the second rectangular incident surface.

[0010] Furthermore, the second light homogenizing element is used to adjust the shape of the light spot into a rectangle, so that the long side of the rectangular light spot of the light source light emitted by the combined light to the third rectangular incident surface of the optical modulator is parallel to the long side of the third rectangular incident surface, and the light spot of the wide-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element covers the light spot of the narrow-spectrum light beam.

[0011] Furthermore, the distance between the second lens unit and the first light homogenizing element is greater than or equal to 0.1 mm and less than or equal to 10 mm.

[0012] Furthermore, a first lens unit is provided on the optical path from the broadband light source to the first light combining element, for shaping the incident broadband light beam in at least one of the first direction and the second direction, so that the ratio of the spot size of the broadband light beam incident to the second rectangular incident surface in the first direction and the second direction is related to the ratio of the long side to the short side of the second rectangular incident surface, and the incident angle of the broadband light beam incident to the second rectangular incident surface corresponding to the first direction is smaller than that in the second direction, and the first direction is perpendicular to the second direction.

[0013] Furthermore, it also includes a third lens unit, which is located on the optical path of the narrow spectrum light beam emitted by the second lens unit and the wide spectrum light beam emitted by the first lens unit, and is used to collimate the incident light beam so that the optical axes of the lights incident on the second rectangular incident surface coincide.

[0014] Furthermore, the broadband light source includes an excitation light source and a wavelength conversion element, the wavelength conversion element is irradiated by the excitation light source to generate a broadband light beam, and also includes a guiding element, the guiding element is arranged on an output light path of light of the first polarization state of the overlapping band in the broadband light beam guided by the first light combining element, the light of the first polarization state of the overlapping band is returned and guided to the fluorescent surface of the wavelength conversion element by the guiding element, the light of the first polarization state of the overlapping band is diffusely reflected by the wavelength conversion element to be converted light, the converted light includes light of the first polarization state of the overlapping band and light of the second polarization state of the overlapping band, and the converted light is emitted to the first light combining element.

[0015] Furthermore, the guiding element reflects light of the first polarization state in the overlapping band, and the light of the first polarization state in the overlapping band in the wide-spectrum light beam emitted from the first light combining element is reflected back to the first light combining element by the guiding element and then guided by the first light combining element to the wavelength conversion element.

[0016] Furthermore, when the excitation light source irradiates the wavelength conversion element, the residual excitation light that is not excited and converted is guided out by the first light combining element, and the residual excitation light is emitted in the same direction as the light of the first polarization state in the overlapping band of the wide-spectrum light beam. The residual excitation light is returned by the guiding element and guided to the wavelength conversion element for re-excitation.

[0017] Furthermore, the wavelength conversion element is dynamically movable, and the wavelength conversion element includes at least one wavelength conversion region, and the light of the first polarization state in the overlapping wavelength band is reflected by the fluorescent surface of the wavelength conversion region to become converted light.

[0018] Furthermore, the excitation light source and the guiding element are located on the same side of the first light combining element;

[0019] The guiding element reflects light of the first polarization state in the overlapping band and transmits the excitation light emitted by the excitation light source; or, the guiding element is coated in partitions, and a part of the area of ​​the guiding element is used for allowing the excitation light emitted by the excitation light source to pass through; or, the guiding element is set off-axis relative to the optical path of the excitation light emitted by the excitation light source.

[0020] Furthermore, the guiding element is connected to the first light combining element as a whole.

[0021] Furthermore, the broad spectrum light beam includes a plurality of different broad spectrum bands, and the narrow spectrum light beam includes a plurality of different narrow spectrum bands, and at least one broad spectrum band and one narrow spectrum band have an overlapping band.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] The light source device described in the utility model adopts a method of mixing a wide-spectrum light beam and a narrow-spectrum light beam for light output, which can effectively improve the light combining efficiency. The wide-spectrum light beam and the narrow-spectrum light beam are combined not only by wavelength but also by polarization, thereby reducing the light loss when the wide-spectrum light beam and the narrow-spectrum light beam are combined when there is an overlapping band, improving the utilization rate of the wide-spectrum light beam, and further more effectively improving the light output brightness, achieving high brightness and high color gamut, effectively solving the speckle problem, having good comprehensive performance, and effectively improving the projection picture quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a light source device of the present invention;

[0025] Figure 2 is a schematic structural diagram of another light source device of the present invention;

[0026] Figure 3 is a schematic structural diagram of another light source device of the present invention;

[0027] Figure 4 is a schematic structural diagram of another light source device of the present invention;

[0028] Figure 5 is a structural schematic diagram of another light source device of the present invention;

[0029] Figure 6 A schematic diagram of a light spot of a narrow spectrum light beam provided by an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of another narrow spectrum light spot provided by an embodiment of the present invention;

[0031] Figure 8 A schematic diagram of a light spot of another narrow spectrum light beam provided by an embodiment of the present invention;

[0032] Fig. 9 A schematic diagram of a light spot of another narrow spectrum light beam provided by an embodiment of the present invention;

[0033] Fig.10 A schematic diagram of the structure of a narrow spectrum light source provided by an embodiment of the present invention;

[0034] Fig.11 A schematic diagram of the structure of another narrow spectrum light source provided by an embodiment of the present invention;

[0035] Fig.12 A schematic diagram of the structure of another narrow-spectrum light source provided by an embodiment of the present invention;

[0036] Fig.13 is a structural schematic diagram of another light source device of the present invention;

[0037] Fig.14 is a structural schematic diagram of another light source device of the present invention;

[0038] Fig.15 It is a structural schematic diagram of a projection device of the present invention;

[0039] Fig.16 A timing diagram of a display cycle provided by an embodiment of the present invention;

[0040] Fig.17 A timing diagram of another display cycle provided by an embodiment of the present invention;

[0041] Fig.18 A timing diagram of another display cycle provided by an embodiment of the present invention;

[0042] Fig.19 A timing diagram of another display cycle provided by an embodiment of the present invention;

[0043] Fig. 20 A timing diagram of another display cycle provided by an embodiment of the present invention;

[0044] Fig.21 A schematic diagram of a spectral characteristic of the first light combining element of the present invention;

[0045] Fig. 22 The figure is a schematic diagram of functional modules of a projection device of the present invention.

[0046] In the figure:

[0047] Narrow spectrum light source 100, broadband light source 200, excitation light source 201, wavelength conversion element 202, first light combining element 301, first lens unit 302, second light homogenizing element 303, first light homogenizing element 304, second lens unit 305, third lens unit 306, dynamic diffusion element 307, guiding element 308, red sub-light source 5, green sub-light source 6, excitation sub-light source 7, second light combining element 8, image processor 110, projection optical machine 120, central controller 130, storage module 140, input module 150, communication module 160. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] A light source device disclosed in an embodiment of the utility model adopts a mixed light mode of a narrow-spectrum light source and a wide-spectrum light source, and has high light combining efficiency, effectively reduces light loss, better improves light output brightness, achieves high brightness and high color gamut, and effectively solves the speckle problem. It has good comprehensive performance and effectively improves the quality of the projection picture.

[0050] like Figure 1 A light source device shown mainly includes a narrow spectrum light source 100, a broadband light source 200 and a first light combining element 301, wherein a narrow spectrum light beam emitted by the narrow spectrum light source 100 and a broadband light beam emitted by the broadband light source 200 are emitted to the first light combining element 301 to be combined and emitted, and the narrow spectrum light beam emitted by the narrow spectrum light source 100 and the broadband light beam emitted by the broadband light source 200 have an overlapping wavelength band, and the narrow spectrum light beam emitted by the narrow spectrum light source 100 includes light of a first polarization state in the overlapping wavelength band;

[0051] The first light combining element 301 transmits the narrow spectrum light beam emitted by the narrow spectrum light source 100, and reflects the light of the second polarization state of the overlapping band and the light of the remaining bands in the wide spectrum light beam emitted by the wide spectrum light source 200 except the overlapping band; or it can also be that the first light combining element 301 reflects the narrow spectrum light beam emitted by the narrow spectrum light source 100, and transmits the light of the second polarization state of the overlapping band and the light of the remaining bands in the wide spectrum light beam emitted by the wide spectrum light source 200 except the overlapping band.

[0052] That is, the narrow spectrum light beam emitted by the narrow spectrum light source 100 and the wide spectrum light beam emitted by the wide spectrum light source 200 are wavelength combined and polarization combined at the same time through the first light combining element 301. Wavelength combination refers to that the optical device has transmission or reflection characteristics for light of different wavelengths, respectively, and light of different wavelengths enters the optical device from different directions, wherein light of one wavelength is transmitted from the optical device, and light of another wavelength is reflected by the optical device, and finally light of different wavelengths is guided by the optical device to be emitted in the same direction to achieve combination of light. Polarization combination refers to that the optical device has transmission or reflection characteristics for light of different polarization states, respectively, and light of different polarization states enters the optical device from different directions, wherein light of one polarization state is transmitted from the optical device, and light of another polarization state is reflected by the optical device, and finally light of different polarization states is guided by the optical device to be emitted in the same direction to achieve combination of light. The first light-combining element 301 in the present embodiment has transmission or reflection characteristics for lights of different bands in the narrow-spectrum light beam and the wide-spectrum light beam, respectively, and for the light of the overlapping band of the narrow-spectrum light beam and the wide-spectrum light beam, it transmits light of one polarization state and reflects light of the other polarization state. Therefore, when the narrow-spectrum light beam and the wide-spectrum light beam are combined, light of one polarization state in the overlapping band of the wide-spectrum light beam can be effectively utilized, which can effectively improve the light combining efficiency, reduce the light loss of the wide-spectrum light beam, improve the combined light output brightness, and achieve high brightness and high color gamut.

[0053] Specifically, the first light-combining element 301 can be a substrate with a single-sided coating or a double-sided coating. The coating method enables the first light-combining element 301 to achieve the required transflective characteristics. When the narrow-spectrum light beam emitted by the narrow-spectrum light source 100 and the wide-spectrum light beam emitted by the wide-spectrum light source 200 are combined through the first light-combining element 301, taking "the first light-combining element 301 transmits the narrow-spectrum light beam emitted by the narrow-spectrum light source 100, and the first light-combining element 301 reflects the light of the second polarization state of the overlapping band and the light of the remaining bands of the wide-spectrum light beam emitted by the wide-spectrum light source 200 except the overlapping band" as an example for explanation, the narrow-spectrum light beam emitted by the narrow-spectrum light source 100 will all be transmitted through the first light-combining element 301 and enter the light-combining optical path to constitute a component of the light-combining light beam, and the light of the remaining bands of the wide-spectrum light beam except the overlapping band will also be reflected by the first light-combining element 301 and guided to the light-combining optical path, so that the light of the remaining bands of the wide-spectrum light beam except the overlapping band will constitute a component of the light-combining light beam. At the same time, due to the "first light-combining element 3 01 reflects the light of the second polarization state of the overlapping band, and the first light-combining element 301 transmits the narrow-spectrum light beam emitted by the narrow-spectrum light source 100, and the narrow-spectrum light beam includes the light of the first polarization state of the overlapping band", that is, the first light-combining element 301 transmits the light of the first polarization state of the overlapping band and reflects the light of the second polarization state of the overlapping band, so that the light of the overlapping band of the wide-spectrum light beam will be split into two paths after being irradiated on the first light-combining element 301, wherein the light of the second polarization state of the overlapping band in the wide-spectrum light beam will be reflected and guided into the light-combining optical path due to the reflection effect of the first light-combining element 301, that is, the light of the second polarization state of the overlapping band in the wide-spectrum light beam can be directly merged into the light-combining beam to constitute a component of the light-combining beam, while the light of the first polarization state of the overlapping band in the wide-spectrum light beam is transmitted from the first light-combining element 301 without entering the light-combining optical path, so that the present embodiment effectively utilizes the light of the second polarization state of the overlapping band in the wide-spectrum light beam, improves the utilization rate of the wide-spectrum light beam, reduces light loss, and improves the light-combining optical effect. More specifically, the narrow spectrum light source 100 can be a laser light source, so that the linear polarized light emitted by the narrow spectrum light source 100 can be S-state linear polarized light or P-state linear polarized light, and the wide spectrum light source 200 can be an LED light source or a fluorescent excitation light source. The wide spectrum light beam emitted by the wide spectrum light source 200 is natural light with a wider wavelength range than the narrow spectrum light source 100. When the narrow spectrum light beam emitted by the narrow spectrum light source 100 and the wide spectrum light beam emitted by the wide spectrum light source 200 are combined through the first light combining element 301, only the S-state linear polarized light or P-state linear polarized light loss of the overlapping wavelength band in the wide spectrum light beam can be achieved, thereby effectively improving the utilization rate of the wide spectrum light source 200, effectively improving the light output brightness, achieving high brightness and high color gamut, effectively solving the speckle problem, having good comprehensive performance, and effectively improving the quality of the projection picture.

[0054] In one embodiment, the broad spectrum light beam includes several different broad spectrum bands, the narrow spectrum light beam includes several different narrow spectrum bands, and at least one of the broad spectrum bands and one of the narrow spectrum bands have an overlapping band. For example, the narrow spectrum light source 100 may specifically include a red laser light source, a green laser light source and a blue laser light source, so that the narrow spectrum light beam emitted by the narrow spectrum light source 100 includes three different narrow spectrum bands, and the wide spectrum light beam emitted by the wide spectrum light source 200 may also include three different wide spectrum bands, for example, three wide spectrum bands of 430-490nm, 510-540nm and 625-680nm. It may be that only one of the wide spectrum bands has an overlapping band with one narrow spectrum band, or that three wide spectrum bands and three narrow spectrum bands respectively have overlapping bands. The first light combining element 301 is made to achieve the required transflective characteristics by coating, so that when the wide spectrum light beam and the narrow spectrum light beam are combined, the light energy of at least one of the polarization states of the overlapping bands in the wide spectrum light beam is merged into the combined light path, thereby improving the utilization efficiency of the wide spectrum light beam and improving the light combining efficiency. Of course, the number of broadband bands in the broadband light beam is not equal to the number of narrow bands in the narrow light beam. There may be only one broadband band and multiple narrow bands, or there may be multiple broadband bands and only one narrow band. It can be flexibly set according to needs. In a specific embodiment, the broadband light source 200 is a fluorescent excitation light source, which includes an excitation light source and a wavelength conversion element. The excitation light source can be a blue laser. The excitation light source irradiates the wavelength conversion element to generate fluorescence as a broadband light beam. The broadband light beam can mainly include yellow fluorescence. The narrow spectrum light source 100 specifically includes three types: a red laser light source, a green laser light source and a blue laser light source. The lasers emitted by the red laser light source, the green laser light source and the blue laser light source are P-state linearly polarized light. The transmissive and reflective characteristics of the first light combining element 301 can be specifically as follows: Fig.21As shown, the first light combining element 301 transmits blue light with a wavelength band of 430-490nm, P-state green light with a wavelength band of 510-540nm, and red light with a wavelength band of 625-680nm (or P-state red light with a wavelength band of 625-680nm), and the first light combining element 301 reflects light in other wavelength bands and S-state green light with a wavelength band of 510-540nm (and S-state red light with a wavelength band of 625-680nm). The yellow fluorescence generated by the wide-spectrum light source 200 has a wavelength range of 500-680nm. When the yellow fluorescence is irradiated on the first light combining element 301, the P-state light with a wavelength band of 510-540nm and the S-state red light with a wavelength band of 625-6 Light of 80nm (or P-state red light with a wavelength band of 625-680nm) will be transmitted from the first light-combining element 301 without entering the light-combining optical path. S-state light with a wavelength band of 510-540nm in the yellow fluorescence (and S-state red light with a wavelength band of 625-680nm) will enter the light-combining optical path through reflection from the first light-combining element 301. Light of other wavelength bands in the yellow fluorescence will also be reflected into the light-combining optical path. Therefore, when combining the narrow-spectrum light beam and the wide-spectrum light beam, both wavelength combining and polarization combining are performed, so that light of one polarization state in the overlapping wavelength bands in the wide-spectrum light beam can enter the light-combining optical path, thereby improving the utilization rate of the wide-spectrum light beam, reducing light loss, and improving the light output brightness. Furthermore, to express the utilization rate of the wide-spectrum light beam in a quantitative manner, all S-state light in the yellow fluorescence will be reflected by the first light-combining element 301 and enter the light-combining optical path, all S-state light in the yellow fluorescence accounts for approximately 50% of the total energy of the yellow fluorescence, and only a portion of the P-state light in the yellow fluorescence is reflected into the light-combining optical path, and the P-state light in the overlapping band of the yellow fluorescence is transmitted through the first light-combining element 301 and cannot enter the light-combining optical path. Assuming that the P-state light in the yellow fluorescence reflected into the light-combining optical path accounts for approximately 35% of the total energy of the yellow fluorescence, another 15% of the yellow fluorescence will be transmitted through the first light-combining element 301 and lost.

[0055] like Figure 2In one embodiment shown, a second light homogenizing element 303 is provided on the light path of the light combining output of the first light combining element 301, and is used to homogenize the light beam incident on the second rectangular incident surface of the first light combining element 301. In some embodiments, the spot shape is adjusted to a rectangle, so that the long side of the rectangular spot of the light source light emitted by the light combining to the third rectangular incident surface of the light modulator is parallel to the long side of the third rectangular incident surface, and the spot of the wide-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element 303 covers the spot of the narrow-spectrum light beam. The spot shape of the light source light including the narrow-spectrum light beam and the wide-spectrum light beam is adjusted by the second light homogenizing element 303, so that the spot is more matched with the incident surface of the light modulator, thereby improving the light efficiency, and the spot of the wide-spectrum light beam incident on the second rectangular incident surface covers the spot of the narrow-spectrum light beam, thereby improving the display brightness and the uniformity of the brightness, and effectively improving the quality of the projected picture. Preferably, the second light homogenizing element 303 adopts a fly-eye lens, and the fly-eye lens is used to homogenize the light source light containing the wide-spectrum light beam, which can reduce the use of the beam reduction lens and reduce the system volume. Furthermore, the interface of the fly-eye unit of the second light homogenizing element 303 can be rectangular, and the ratio of the spot size of the wide-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element 303 in the first direction and the second direction is related to the ratio of the long side to the short side of the fly-eye unit, thereby improving the light collection efficiency. It should be noted that the ratio of the spot size of the wide-spectrum light beam in the first direction and the second direction mentioned here is related to the ratio of the long side to the short side of the fly-eye unit, and the ratio of the spot size in the first direction and the second direction can be inversely proportional to the ratio of the long side to the short side of the fly-eye unit. The incident surface of the second light homogenizing element 303 can also be a shape other than a rectangle, such as a hexagon, a trapezoid, a circle, etc., and the embodiment of the utility model is not limited to this.

[0056] Further, in Figure 3In the illustrated embodiment, the broadband light source 200 includes an excitation light source 201 and a wavelength conversion element 202. The wavelength conversion element 202 is irradiated by the excitation light source 201 to generate a broadband light beam. The wavelength conversion element 202 can be a transmissive fluorescent element or a reflective fluorescent element. The transmissive fluorescent element means that when the excitation light emitted by the excitation light source 201 irradiates the wavelength conversion element 202, the fluorescence generated by the wavelength conversion element 202 is emitted in the same direction as the incident direction of the excitation light. The reflective fluorescent element means that when the excitation light emitted by the excitation light source 201 irradiates the wavelength conversion element 202, the fluorescence generated by the wavelength conversion element 202 is emitted in the opposite direction to the incident direction of the excitation light. The arrangement can be flexibly performed according to the requirements of the optical path. It also includes a guiding element 308, which is arranged on the output light path of the light of the first polarization state of the overlapping band in the wide-spectrum light beam guided by the first light-combining element 301. The light of the first polarization state of the overlapping band is returned and guided to the fluorescent surface of the wavelength conversion element 202 by the guiding element 308. The light of the first polarization state of the overlapping band is diffusely reflected by the wavelength conversion element 202 to be converted light. The converted light includes the light of the first polarization state of the overlapping band and the light of the second polarization state of the overlapping band. The converted light is emitted to the first light-combining element 301. Specifically, the guiding element 308 reflects the light of the first polarization state of the overlapping band, and the light of the first polarization state of the overlapping band in the wide-spectrum light beam emitted from the first light-combining element 301 is reflected back to the first light-combining element 301 by the guiding element 308, and then guided to the wavelength conversion element 202 by the first light-combining element 301. The guiding element 308 can specifically be a plane mirror, a curved mirror, a prism, a dichroic mirror that reflects the light of the first polarization state of the overlapping band and transmits other light, etc., as long as the guiding element 308 can return the light of the first polarization state of the overlapping band to the first light-combining element 301 and irradiate the wavelength conversion element 202 after being guided by the first light-combining element 301.

[0057] When the light of the first polarization state of the overlapping band is returned and irradiated on the wavelength conversion element 202 after being acted upon by the guiding element 308, due to the diffuse reflection effect, the light of the first polarization state of the overlapping band is reflected by the wavelength conversion element 202 and becomes converted light. The converted light includes the light of the first polarization state of the overlapping band and the light of the second polarization state of the overlapping band. In other words, a part of the light of the first polarization state of the original overlapping band undergoes polarization state conversion and becomes the light of the second polarization state of the overlapping band. Then the converted light is emitted to the first light combining element 301. The light of the second polarization state of the overlapping band in the converted light will be reflected by the first light combining element 301 and enter the light combining optical path. Thus, the light of the second polarization state of the overlapping band in the converted light constitutes a component of the combined light beam. The light of the second polarization state of the overlapping band in the converted light is recycled and reused, thereby effectively improving the wide spectrum. The utilization rate of the light beam is improved, and the light of the first polarization state of the overlapping band in the converted light will be transmitted from the first light-combining element 301 again. Due to the action of the guiding element 308, this part of the light will be reflected by the guiding element 308 and guided back to the first light-combining element 301 and guided by the first light-combining element 301 to the wavelength conversion element 202. This part of the light will be changed again due to the diffuse reflection effect into a part of the light of the first polarization state of the overlapping band and a part of the light of the second polarization state of the overlapping band. This cycle is repeated continuously, so that the light of the first polarization state of the overlapping band in the wide-spectrum light beam originally guided by the first light-combining element 301 is all converted into the light of the second polarization state of the overlapping band, that is, all the light of the overlapping bands in the original wide-spectrum light beam are merged into the light-combining optical path, which greatly improves the utilization rate of the wide-spectrum light beam, reduces light loss, and improves the light output brightness. Specifically, if the P-state light in the overlapping band of the wide-spectrum light beam originally guided out by the first light-combining element 301 accounts for 15% of the total energy of the yellow fluorescence, after this part of the light passes through the guiding element 308 and returns to irradiate the wavelength conversion element 202, due to the diffuse reflection effect, this part of the light is reflected by the wavelength conversion element 202 and becomes the P-state light in the overlapping band accounting for 7.5% of the total energy of the yellow fluorescence and the S-state light in the overlapping band accounting for 7.5% of the total energy of the yellow fluorescence, wherein the S-state light in the overlapping band accounting for 7.5% of the total energy of the yellow fluorescence is reflected by the first light-combining element 301. The optical element 301 reflects and guides the light to the combined light path, while the P-state light in the overlapping band accounting for 7.5% of the total energy of the yellow fluorescence is still transmitted from the first light-combining element 301, and then the P-state light in the overlapping band accounting for 7.5% of the total energy of the yellow fluorescence is returned to illuminate the wavelength conversion element 202 through the action of the guiding element 308, and so on, so that all the P-state light in the overlapping band that originally accounted for 15% of the total energy of the yellow fluorescence is converted into S-state light in the overlapping band and enters the combined light path, thereby improving the utilization rate of the wide-spectrum light beam, reducing light loss, and improving the brightness of the light output.In one embodiment, if the light modulator uses a device such as LCOS or LCD that has polarization state requirements for the incident light, there is no need to set a polarization conversion element on the light incident side of the light modulator to adjust the polarization state of the light, so the number of devices can be reduced while maintaining high brightness.

[0058] Furthermore, the wavelength conversion element 202 can be a static component or a dynamic component, that is, the wavelength conversion element 202 can be a stationary fluorescent element, and the wavelength conversion element 202 as a whole only includes one wavelength conversion area (fluorescent area), so that when the excitation light source 201 irradiates the wavelength conversion element 202, only a single color of fluorescence is generated; the wavelength conversion element 202 can also be dynamically active, and the wavelength conversion element includes one or more wavelength conversion areas. When the wavelength conversion element is periodically active, each wavelength conversion area periodically moves to the optical path to be irradiated by the excitation light emitted by the excitation light source 201, so that the wavelength conversion element 202 can sequentially generate fluorescence of different colors. Regardless of the structure of the wavelength conversion element 202, as long as the first polarization state of the reflected overlapping band is irradiated on the fluorescent surface of the wavelength conversion area of ​​the wavelength conversion element 202, due to the diffuse reflection effect, the first polarization state of the reflected overlapping band is reflected by the wavelength conversion element 202 and becomes converted light, and the converted light includes the first polarization state of the overlapping band and the second polarization state of the overlapping band.

[0059] Furthermore, when the excitation light source 201 irradiates the wavelength conversion element 202, the residual excitation light that is not converted is guided out by the first light combining element 301, and the residual excitation light is emitted in the same direction as the light of the first polarization state of the overlapping wavelength band in the wide-spectrum light beam, and the residual excitation light is guided back to the wavelength conversion element 202 by the guiding element 308 to excite again. Figure 2 In the illustrated embodiment, when the excitation light source 201 irradiates the wavelength conversion element 202, the residual excitation light that is not excited and converted and the wide-spectrum light beam generated by the wavelength conversion element 202 are both directed toward the first light combining element 301. Assuming that the excitation light emitted by the excitation light source 201 is linearly polarized light in the P state, the first light combining element 301 transmits the excitation light, so that the residual excitation light and the light of the first polarization state of the overlapping band in the wide-spectrum light beam are emitted from the first light combining element 301 in the same direction, and then the residual excitation light is irradiated on the guiding element 308, and the guiding element 308 returns the residual excitation light and the light of the first polarization state of the overlapping band to the first light combining element 301, and then the residual excitation light and the light of the first polarization state of the overlapping band are guided by the first light combining element 301 ( Figure 2 The embodiment shown is transmission) and reflected back to the wavelength conversion element 202, and the residual excitation light irradiates the wavelength conversion element 202 again for excitation, thereby improving the utilization rate of the excitation light emitted by the excitation light source 201, improving the fluorescence excitation conversion efficiency, and improving the light output brightness.

[0060] like Figure 4 In one embodiment shown, the excitation light source 201 and the wavelength conversion element 202 of the wide-spectrum light source 200 can be separately arranged, for example, the first light combining element 301 is between the excitation light source 201 and the wavelength conversion element 202, that is, the excitation light source 201 and the wavelength conversion element 202 are respectively located on both sides of the first light combining element 301, and the first light combining element 301 transmits the excitation light emitted by the excitation light source 201, so that the excitation light passes through the first light combining element 301 and irradiates the wavelength conversion element 202, and the fluorescence generated by the wavelength conversion element 202 is emitted to the first light combining element 301. In addition, it can also be Figure 3 The embodiment shown is Figure 4 The illustrated embodiments are combined, where the excitation light source 201 and the wavelength conversion element 202 are arranged on the same side of the first light combining element 301, and an additional excitation light source is arranged on the other side of the first light combining element 301. The excitation light emitted by the additional excitation light source is transmitted through the first light combining element 301 and irradiated on the wavelength conversion element 202 to excite and produce fluorescence.

[0061] exist Figure 4In the illustrated embodiment, the guiding element 308 is disposed on the outgoing optical path of the light of the first polarization state of the overlapping band in the wide-spectrum light beam guided by the first light combining element 301, and the light of the first polarization state of the overlapping band is turned back and guided to the wavelength conversion element 202 by the guiding element 308. The guiding element 308 is on the same side as the excitation light source 201, and the excitation light emitted by the excitation light source 201 needs to pass through the guiding element 308 and then be transmitted from the first light combining element 301 and then irradiated on the wavelength conversion element 202. Specifically, the guiding element 308 can reflect the light of the first polarization state of the overlapping band and transmit the excitation light emitted by the excitation light source 201, so that the excitation light emitted by the excitation light source 201 can be transmitted through the guiding element 308 to normally irradiate on the wavelength conversion element 202 to excite and generate fluorescence, and at the same time, the light of the first polarization state of the overlapping band can also be effectively reflected and guided by the guiding element 308 and turned back to the wavelength conversion element 202 to be diffusely reflected as conversion light. In addition, the guiding element 308 may also be a partitioned coating, and a portion of the guiding element 308 is used for the excitation light emitted by the excitation light source 201 to pass through. Specifically, a portion of the guiding element 308 may be coated with a total reflection film to reflect and guide the light of the first polarization state of the overlapping band, and another portion of the guiding element 308 may be opened to allow the excitation light emitted by the excitation light source 201 to pass through or may be coated with a dichroic film (which reflects the light of the first polarization state of the overlapping band and transmits the excitation light emitted by the excitation light source 201). Alternatively, the guiding element 308 may be offset from the optical path of the excitation light emitted by the excitation light source 201, and the excitation light emitted by the excitation light source 201 may pass through the side of the guiding element 308 and then be emitted to the first light combining element 301 and irradiate the wavelength conversion element 202.

[0062] like Figure 5 As shown, the guiding element 308 is connected to the first light combining element 301 as a whole, and a coating is provided on the first light combining element 301 to control the spectral characteristics of the first light combining element 301. Specifically, the first light combining element 301 transmits the narrow spectrum light beam emitted by the narrow spectrum light source 100 (including the light of the first polarization state of the overlapping band), and the first light combining element 301 reflects the light of the second polarization state of the overlapping band and the light of the remaining bands except the overlapping band in the wide spectrum light beam emitted by the wide spectrum light source 200. A coating is provided on one side of the first light combining element 301, and the guiding element 308 is connected or integrated on the other side. For example, the guiding element 308 may include a plurality of prism units. The light of the first polarization state of the overlapping band is reflected by the guiding element 308 and returned to the wavelength conversion element 202. Then, the returned light of the first polarization state of the overlapping band is irradiated on the fluorescent surface of the wavelength conversion element 202, and is reflected and converted into converted light due to the diffuse reflection effect. The converted light includes the light of the first polarization state of the overlapping band and the light of the second polarization state of the overlapping band.

[0063] In one embodiment, Figure 5 As shown, the light source device includes a narrow spectrum light source 100 and a broadband light source 200. The narrow spectrum light beam emitted by the narrow spectrum light source 100 and the broadband light beam emitted by the broadband light source 200 are guided by the first light combining element 301 to be emitted from the same direction to form a light source light. Optionally, the light spot of the broadband light beam emitted from the first light combining element 301 covers the light spot of the narrow spectrum light beam, so that the light spot of the narrow spectrum light beam is located within the light spot coverage range of the broadband light beam. Preferably, the light spot of the narrow spectrum light beam is located at the center of the light spot of the broadband light beam, so as to further improve the uniformity of the light. It should be understood that the narrow spectrum light beam emitted by the narrow spectrum light source 100 and the broadband light beam emitted by the broadband light source 200 may also be combined without the light combining element, but by placing the narrow spectrum light source 100 and the broadband light source 200 in other ways so that the light beams emitted by the two are emitted from the same direction.

[0064] The narrow spectrum light source 100 is used to emit a narrow spectrum light beam. The narrow spectrum light source 100 may include one or more independent light emitting devices, each of which may include one or more light emitters for emitting narrow spectrum light. For example, a light emitting device may include only a single light emitter or include a light emitter array, and the light emitter array may include light emitters of a single color or different colors. For example, at least two columns of light emitters are arranged on a light emitting device, each column of light emitters is provided with a plurality of light emitters, and the number of light emitters in each column may be the same or different. For example, a light emitting device is provided with a column of red light emitters and a column of light emitters mixed with blue and green. For another example, a light emitting device is provided with a column of red light emitters, a column of blue light emitters and a column of green light emitters. When a light emitting device includes a light emitter array, the light spot of the narrow spectrum light beam emitted by it is composed of the light spots of a plurality of light emitters, thus forming a rectangular or elliptical light spot, Figure 6 A schematic diagram of the light spot of a narrow spectrum light beam emitted by a row of light emitters is shown. Furthermore, the red light emitter on the light emitting device is closer to the light-emitting side of the narrow spectrum light source than the light emitters of other colors (such as blue and green), so that the optical path of the red light is shorter than that of the other colors of light. Since the divergence angle of red light is larger than that of other colors of light, the red light spot is usually larger than the blue-green light spot, so that the light spot size of each color light in the narrow spectrum light beam emitted by the narrow spectrum light source 100 is close, thereby improving the light effect and light uniformity.

[0065] Optionally, refer to Figure 7-Figure 9The narrow spectrum light beam emitted by the narrow spectrum light source 100 has a rectangular or elliptical light spot, and the narrow spectrum light beam includes a first narrow spectrum sub-beam and a second narrow spectrum sub-beam with a rectangular or elliptical light spot. The light spots of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam can be completely overlapped (completely overlapped when the sizes are the same, and the large light spot covers the small light spot when the sizes are different) or partially overlapped, and there can also be a certain distance. Preferably, the light spots of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam partially overlap or there is a certain distance, so as to expand the light spot area and facilitate the dissipation of the spot. For example, the light spots of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam emitted from the narrow spectrum light source 100 are arranged side by side, and the long side of the light spot of the narrow spectrum beam is equal to the longer long side of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam, and the short side of the light spot of the narrow spectrum beam is greater than the longer short side of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam and is less than or equal to the sum of the short side of the light spot of the first narrow spectrum sub-beam, the short side of the light spot of the second narrow spectrum sub-beam and the factor a, a=5mm, which not only expands the light spot area, but also helps to avoid component interference caused by components being too close, and production process restrictions caused by the excessive size of the die-casting body, reduce assembly difficulty, improve yield, etc. Further, the color types of light contained in the first narrow spectrum sub-beam and the second narrow spectrum sub-beam can be the same or different. Preferably, the color types of light contained in the two are the same, which can improve the uniformity of light and help eliminate scattered spots.

[0066] In some embodiments, the narrow spectrum light source 100 includes a first narrow spectrum sub-light source and a first guiding component, wherein the first narrow spectrum sub-light source is used to emit a first light beam having a rectangular or elliptical light spot; and the first guiding component is used to split the first light beam emitted by the first narrow spectrum sub-light source into a first narrow spectrum sub-light beam and a second narrow spectrum sub-light beam. In this embodiment, the narrow spectrum light source 100 includes only one light emitting device, and the light beam emitted by the light source is split into two sub-light beams by using the guiding component, thereby saving costs.

[0067] For example, Fig.10 As shown, two columns of light emitters are arranged on the first narrow spectrum sub-light source, a column of light emitters close to the narrow spectrum light source is used to emit a red light beam, and a column of light emitters far from the narrow spectrum light beam is used to emit a blue-green light beam, and the first light beam includes the red light beam and the blue-green light beam. The first guiding component includes a reflector 101, a semi-transmissive and semi-reflective element 102 and a reflector 103. The blue-green light beam is reflected to the semi-transmissive and semi-reflective element 102 by the reflector 101, a part of the blue-green light beam is transmitted by the semi-transmissive and semi-reflective element 102, and the other part is reflected to the reflector 103 by the semi-transmissive and semi-reflective element 102. The red light beam is directly incident on the semi-transmissive and semi-reflective element 102, a part of the red light beam is reflected by the semi-transmissive and semi-reflective element 102, and is combined with a part of the blue-green light beam transmitted by the semi-transmissive and semi-reflective element 102 to form a first narrow spectrum sub-light beam, and another part of the red light beam is transmitted to the reflector 103 by the semi-transmissive and semi-reflective element 102, and is combined with a part of the blue-green light beam reflected by the semi-transmissive and semi-reflective element 102 at the reflector 103 to form a second narrow spectrum sub-light beam.

[0068] In some other embodiments, the narrow spectrum light source 100 includes a second narrow spectrum sub-light source and a third narrow spectrum sub-light source, wherein the second narrow spectrum sub-light source and the third narrow spectrum sub-light source are two independent devices, wherein the second narrow spectrum sub-light source is used to emit a first narrow spectrum sub-light beam; and the third narrow spectrum light source is used to emit a second narrow spectrum sub-light beam. In this embodiment, the narrow spectrum light source 100 includes two light-emitting devices, which can achieve high-brightness display.

[0069] Optionally, the long sides of the second narrow spectrum sub-light source and the third narrow spectrum sub-light source are parallel to each other, such as Figure 11-Figure 12 As shown, the dots and double arrows indicate polarization directions. The narrow spectrum light source 100 further includes a second guiding component, which is used to guide the first narrow spectrum sub-beam emitted from the second narrow spectrum sub-light source and the second narrow spectrum sub-beam emitted from the third narrow spectrum sub-light source to be emitted from the same direction to form a narrow spectrum beam, and the short side of the light spot of the narrow spectrum beam emitted from the narrow spectrum light source 100 is equal to the sum of the short side of the light spot of the first narrow spectrum sub-beam, the short side of the light spot of the second narrow spectrum sub-beam and a non-negative number b, b≤3mm. By using the guiding component to reduce the spacing between the light spots of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam, the size of subsequent optical components can be reduced, thereby reducing the volume of the system.

[0070] Preferably, if Fig.11 As shown, the second narrow spectrum sub-light source and the third narrow spectrum sub-light source are arranged opposite to each other, and the long sides of the second narrow spectrum sub-light source and the third narrow spectrum sub-light source are parallel to the optical axis of the narrow spectrum light beam emitted by the narrow spectrum light source 100; the second narrow spectrum sub-light source and the third narrow spectrum light source are both provided with at least two columns of light emitters in the third direction, and each column of light emitters is provided with a plurality of light emitters along the fourth direction, and the long side of the light spot of the narrow spectrum light beam is related to the length of each column of light emitters in the fourth direction, wherein the third direction corresponds to the long sides of the second narrow spectrum sub-light source and the third narrow spectrum light source, and the fourth direction corresponds to the short sides of the second narrow spectrum light source and the third narrow spectrum light source. In this embodiment, the spacing between the light spots of the first narrow spectrum sub-light beam and the second narrow spectrum sub-light beam can reach 3mm or 2mm, or even smaller, and the spacing between the light spots of the first narrow spectrum sub-light beam and the second narrow spectrum sub-light beam can be further reduced by setting the position of the light emitting device, thereby reducing the volume of the system.

[0071] In the following embodiments, description is made by taking the example that the first narrow spectrum sub-beam and the second narrow spectrum sub-beam contain the same color of light, and both the first narrow spectrum sub-beam and the second narrow spectrum sub-beam contain at least the first narrow spectrum light.

[0072] The broad-spectrum light source 200 is used to emit a broad-spectrum light beam, which includes a first broad-spectrum light. The broad-spectrum light source 200 may include one or more independent light-emitting devices, each of which may include one or more light emitters for emitting broad-spectrum light, such as a light-emitting device may include only a single light emitter or include a light emitter array, and the light emitter array may include light emitters of a single color or different colors.

[0073] The first light combining element 301 is used to guide at least part of the wide-spectrum light beam and at least part of the narrow-spectrum light beam to be emitted from the same direction. Optionally, the light spot of the wide-spectrum light beam emitted from the first light combining element 301 covers the light spot of the narrow-spectrum light beam, thereby improving the uniformity of light combining. The first light combining element 301 may be a light combining element such as an open-hole reflector (the narrow-spectrum light beam is transmitted through the open-hole area, and the wide-spectrum light beam is reflected through the reflector area), or a small reflector (the narrow-spectrum light beam is reflected through the reflector area, and the wide-spectrum light beam is transmitted through the area around the reflector), or a coated dichroic element (one light beam is transmitted and the other light beam is reflected through the coating characteristics).

[0074] In some embodiments, the wavelength ranges of the first broad-spectrum light and the first narrow-spectrum light at least partially overlap, for example, the first narrow-spectrum light is green laser, and the first broad-spectrum light is green fluorescence or green LED light or yellow fluorescence; for example, the first narrow-spectrum light is red laser, and the first broad-spectrum light is red LED light or red fluorescence or yellow fluorescence; for example, the first narrow-spectrum light is blue laser, and the first broad-spectrum light is blue LED light or blue fluorescence or cyan fluorescence. By mixing narrow-spectrum light and broad-spectrum light, the advantages of both narrow-spectrum light and broad-spectrum light can be simultaneously included to improve the display effect. Since the wavelength ranges of the first broad-spectrum light and the first narrow-spectrum light at least partially overlap, when wavelength light is combined through the first light-combining element 301, there is usually light loss. In this embodiment, the first light-combining element 301 is used to make the energy of the narrow-spectrum light beam emitted by the first light-combining element 301 account for at least 80% of the energy of the narrow-spectrum light beam incident on the first light-combining element 301, and the energy of the broad-spectrum light beam emitted by the first light-combining element 301 accounts for at least 40% of the energy of the broad-spectrum light beam incident on the first light-combining element 301, such as the transmittance of the narrow-spectrum light beam is about 85%, and the reflectivity of the broad-spectrum light beam is about 45%. For example, the transmittance of the narrow-spectrum light beam is about 90%, and the reflectivity of the broad-spectrum light beam is about 50%. Taking the characteristics of the narrow-spectrum light beam and the broad-spectrum light beam into consideration, the light-combining efficiency is improved, the speckle effect is reduced, and the display effect is improved. Furthermore, a polarization element such as a half-wave plate can be used to make the narrow-spectrum light beam incident on the first light-combining element 301 include only one polarization state (preferably the P polarization state), so as to further improve the light-combining effect.

[0075] For example, if the colors of the first broad-spectrum light and the first narrow-spectrum light are both green (including yellow-green), then through the coating characteristics, the energy of the first narrow-spectrum light emitted by the first light-combining element 301 can account for at least 90% of the energy of the first narrow-spectrum light incident on the first light-combining element 301, and the energy of the first broad-spectrum light emitted by the first light-combining element 301 can account for at least 45% of the energy of the first broad-spectrum light incident on the first light-combining element 301, such as the transmittance of the first narrow-spectrum light is about 92%, and the reflectivity of the first broad-spectrum light is about 48% or 60%. If the colors of the first broad-spectrum light and the first narrow-spectrum light are other colors such as red or blue, the coating characteristics can make the energy of the first narrow-spectrum light emitted by the first light-combining element 301 account for at least 90% of the energy of the first narrow-spectrum light incident on the first light-combining element 301, and the energy of the first broad-spectrum light emitted by the first light-combining element 301 account for at least 70% of the energy of the first broad-spectrum light incident on the first light-combining element 301, such as the transmittance of the first narrow-spectrum light is about 90%, and the reflectivity of the first broad-spectrum light is about 72% or 80%. The light-combining effect is further improved.

[0076] It should be noted that both the broadband light beam and the narrow spectrum light beam may include light of multiple colors, such as the broadband light beam further includes the second broadband light beam, the narrow spectrum light beam further includes the second narrow spectrum light, both the second broadband light beam and the second narrow spectrum light have a second color, which is different from the first color of the first broadband light and the first narrow spectrum light, such as the first color is green, and the second color is red or blue or yellow, etc. Further, the narrow spectrum light beam may also include a third narrow spectrum light, and the third narrow spectrum light has a third color, such as the first color is green, and the third color is blue or red, etc. Optionally, the broadband light beam may also include a third broadband light having a third color. In a preferred embodiment, the narrow spectrum light beam simultaneously includes the first narrow spectrum light of green, the second narrow spectrum light of red, and the third narrow spectrum light of blue, and the broadband light beam includes the first broadband light of green, or simultaneously includes the first broadband light of green and the second broadband light of red, and three-color narrow spectrum light is used to achieve highlight display.

[0077] The narrow spectrum light source 100 and the broad spectrum light source 200 of the light source device can emit light beams at the same time to achieve mixed light of narrow spectrum light and broad spectrum light. The narrow spectrum light source 100 and the broad spectrum light source 200 can also emit light beams separately, that is, at a certain moment, only the narrow spectrum light source 100 emits a narrow spectrum light beam, or only the broad spectrum light source 200 emits a broad spectrum light beam, to meet different user needs. For example, a plurality of display modes can be set on the projection device, such as a first display mode and a second display mode. The projection device can automatically select a certain display mode according to conditions such as the target display content and the display environment, or display the mode selection options on the interface for the user to select. When the display mode is determined, the corresponding light source in the light source device is controlled to emit a light beam. For example, when the display mode is determined to be the first display mode, the narrow spectrum light source 100 and the broad spectrum light source 200 of the light source device are controlled to emit light beams at the same time. If the display mode is determined to be the second display mode, the narrow spectrum light source 100 of the light source device is controlled to emit a light beam. Optionally, a third display mode can also be set on the projection device. When the display mode is determined to be the third display mode, the broad spectrum light source 200 of the light source device is controlled to emit a light beam. It should be understood that no matter which display mode is selected, the second light can be added during the second period of time when the first light is emitted.

[0078] Continue reading Figure 5 The light source device may also include a first lens unit 302, which is located on the optical path of the wide-spectrum light beam emitted by the wide-spectrum light source 200, and is used to shape the incident wide-spectrum light beam in at least one of the first direction and the second direction, so that the ratio of the spot size of the wide-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element 303 in the first direction and the second direction is related to the ratio of the long side to the short side of the second rectangular incident surface, and the incident angle of the wide-spectrum light beam incident on the second rectangular incident surface corresponding to the first direction is smaller than that in the second direction, and the first direction is perpendicular to the second direction. In this embodiment, the first lens unit 302 is used to shape the wide-spectrum light beam, so that the spot size and the incident angle of the wide-spectrum light beam incident on the second light homogenizing element 303 meet the preset conditions, thereby improving the utilization rate of the wide-spectrum light beam generated by the wide-spectrum light source, improving the light collection efficiency, and thus improving the display brightness. It should be noted that the ratio of the spot size of the wide-spectrum light beam in the first direction to the second direction is related to the ratio of the long side to the short side of the second rectangular incident surface, and the ratio of the spot size in the first direction and the second direction is proportional to the ratio of the long side to the short side of the second rectangular incident surface.

[0079] It should be understood that the first lens unit 302 may include one or more lenses, and the incident surface of the second light homogenizing element 303 may also be a shape other than a rectangle, such as a hexagon, a trapezoid, a circle, etc., which is not limited in this embodiment of the present invention.

[0080] In order to better understand the present invention, the light source device is described in detail below in conjunction with a specific embodiment. In this specific embodiment, the narrow spectrum light beam emitted by the narrow spectrum light source 100 includes red, green and blue lasers, and the wide spectrum light beam emitted by the wide spectrum light source 200 includes at least green light.

[0081] Fig.13 FIG. 1 is a schematic diagram of a light source device provided by an embodiment of the present invention. Fig.13 As shown, the light source device includes a narrow-spectrum light source 100, a broadband light source 200, a first light combining element 301, a first lens unit 302 and a second light homogenizing element 303. The broadband light beam emitted by the broadband light source 200 is shaped by the first lens unit 302, combined with the narrow-spectrum light beam emitted by the narrow-spectrum light source 100 at the first light combining element 301, and then incident on the second light homogenizing element 303.

[0082] In some embodiments, the light source device further includes a first light homogenizing element 304 located on the optical path of the narrow spectrum light beam emitted by the narrow spectrum light source 100, which is used to homogenize the narrow spectrum light beam, adjust the spot shape of the incident narrow spectrum light beam to a regular polygon or a rectangle with unequal length and width, and use two light homogenizing elements to homogenize the narrow spectrum light beam, so as to further reduce the speckle effect. If the narrow spectrum light beam emitted by the narrow spectrum light source 100 has a rectangular or elliptical spot, the long side of the spot of the narrow spectrum light beam incident on the first rectangular incident surface of the first light homogenizing element 304 is parallel to the long side of its first rectangular incident surface, thereby improving the light efficiency and reducing the volume of the system. Furthermore, the optical axis of the narrow spectrum light beam incident on the first rectangular incident surface of the first light homogenizing element 304 coincides with the central axis of its first rectangular incident surface, and the spots of the first narrow spectrum sub-beam and the second narrow spectrum sub-beam emitted from the narrow spectrum light source 100 are symmetrical about the optical axis, thereby improving the uniformity of the light. Among them, the first light homogenizing element 304 can be a light homogenizing element such as a fly-eye lens or a light rod, preferably a fly-eye lens.

[0083] Optionally, a second lens unit 305 is further provided on the optical path of the narrow spectrum light beam emitted by the first light homogenizing element 301, which is used to reduce the divergence angle of the incident narrow spectrum light beam, so that the spot size of the narrow spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element 303 is less than or equal to the second rectangular incident surface, and the first light homogenizing element 301 and the second lens unit 305 homogenize, shape and converge the narrow spectrum light beam, thereby improving uniformity and suppressing speckle. In this embodiment, the distance between the second lens unit 305 and the first light homogenizing element 301 is greater than or equal to 0.1 mm and less than or equal to 10 mm, such as 0.2 mm or 0.5 mm or 3 mm or 5 mm, etc., to ensure the convergence effect. It should be understood that the second lens unit 305 may include one or more lenses.

[0084] Furthermore, the light source device further includes a third lens unit 306, which is located on the optical path of the narrow spectrum light beam emitted by the second lens unit 305 and the wide spectrum light beam emitted by the first lens unit 302, and is used to collimate the incident light beam so that the optical axes of the lights incident on the second rectangular incident surface of the second light homogenizing element 303 coincide. In this embodiment, there are narrow spectrum lights whose optical axes do not coincide in the narrow spectrum light beam emitted by the narrow spectrum light source 100. The third lens unit 306 is used to make the optical axes of the lights incident on the second rectangular incident surface of the second light homogenizing element 303 coincide, thereby improving the uniformity of the light, reducing the speckle effect, and improving the display effect. It should be understood that the third lens unit 306 may include one or more lenses.

[0085] In some embodiments, the light source device further comprises a diffusion element located on the optical path of the narrow spectrum light beam emitted by the narrow spectrum light source 100. The diffusion element may be a static or dynamic diffusion element to reduce the speckle effect. Fig.13 The light source device also includes a dynamic diffusion element 307, which is used to drive the dynamic diffusion element 307. The maximum current limit size is between 200mA and 400mA. The vibration frequency of the dynamic diffusion element 307 in the fifth direction and the sixth direction is 50HZ or 60HZ or 70HZ or 80HZ, and the fifth direction is perpendicular to the sixth direction; when the vibration frequencies of the dynamic diffusion element 307 in the fifth direction and the sixth direction are both 50HZ, the duty cycle of the current used to drive the dynamic diffusion element 307 in the fifth direction is between 5% and 10%, and the duty cycle of the current used to drive the dynamic diffusion element 307 in the sixth direction is between 4% and 10%; when the vibration frequencies of the dynamic diffusion element 307 in the fifth direction and the sixth direction are both 60HZ, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 5% and 10%. The duty cycle of the current of 307 is between 3% and 10%, and the duty cycle of the current for driving the dynamic diffusion element 307 in the sixth direction is between 5% and 10%; when the vibration frequencies of the dynamic diffusion element 307 in the fifth direction and the sixth direction are both 70 Hz, the duty cycle of the current for driving the dynamic diffusion element 307 in the fifth direction is between 10% and 20%, and the duty cycle of the current for driving the dynamic diffusion element 307 in the sixth direction is between 13% and 30%; when the vibration frequencies of the dynamic diffusion element 307 in the fifth direction and the sixth direction are both 80 Hz, the duty cycle of the current for driving the dynamic diffusion element 307 in the fifth direction is between 18% and 40%, and the duty cycle of the current for driving the dynamic diffusion element 307 in the sixth direction is between 22% and 60%. In the related prior art, the maximum current limit for driving the dynamic diffusion element is usually 500 mA. Compared with the prior art, this embodiment reduces noise while achieving substantially the same despeckle effect. Table 1 exemplarily shows a drive current parameter setting.

[0086] Table 1

[0087]

[0088]

[0089] Continue reading Fig.13 , the wide-spectrum light source 200 may include a green sub-light source 6 and an excitation sub-light source 7, wherein the green sub-light source 6 includes a first sub-light source (excitation light source) and a wavelength conversion element, the wavelength conversion element is used to generate a first green wide-spectrum light under the irradiation of the first sub-light source; the excitation sub-light source 7 is used to emit excitation light, the excitation light is used to irradiate the wavelength conversion element to generate a second green wide-spectrum light; the first wide-spectrum light includes the first green wide-spectrum light and the second green wide-spectrum light. In this embodiment, green wide-spectrum light is generated by double-sided excitation, more green wide-spectrum light can match more green narrow-spectrum light, thereby achieving the control of green light speckle under high brightness, and adjusting the current according to the actual situation to achieve the balance between speckle and color gamut. It should be understood that the green wide-spectrum light can also be generated by only one green sub-light source 6 or more light sources, and the embodiment of the present invention is not limited to this.

[0090] Furthermore, the wide-spectrum light source 200 may also include a red sub-light source 5 and a second light combining element 8, and the red LED light emitted by the red sub-light source 5 is combined with the green fluorescence in the second light combining element 8. The red LED light and the red laser light maintain the same timing, and the green fluorescence and the green laser light maintain the same timing, which can effectively suppress the corresponding monochromatic field speckle, thereby improving the display effect. Optionally, a beam reduction lens is provided on the light emitting side of each sub-light source in the wide-spectrum light source 200, such as Fig.13 It should be understood that the broadband light source 200 may also include a blue sub-light source or a sub-light source of other colors.

[0091] For example, the second light-combining element 8 reflects red light and blue light, and transmits green light. The blue light emitted by the excitation sub-light source 7 is reflected by the second light-combining element 8 to the wavelength conversion element of the green sub-light source 6 to generate green fluorescence. The excitation sub-light source 7 and the first sub-light source of the green sub-light source 6 perform double-sided excitation on the wavelength conversion element, and the green fluorescence and red light are combined and emitted by the second light-combining element 8. Specifically, the second light-combining element 8 can be a dichroic element, which reflects light with a wavelength less than 450nm and a wavelength greater than 609nm, and transmits light with a wavelength between 545 and 565nm. Similarly, if Fig.14As shown, a guiding element 308 is provided on the outgoing optical path of the light of the first polarization state of the overlapping band in the wide-spectrum light beam guided by the first light-combining element 301, and the guiding element 308 reflects the light of the first polarization state of the overlapping band, and the light of the first polarization state of the overlapping band in the wide-spectrum light beam emitted from the first light-combining element 301 is reflected back to the first light-combining element 301 by the guiding element 308, and then the light is guided by the first light-combining element 301 to the green sub-light source 6 directed toward the wide-spectrum light source 200. Specifically, since the second light-combining element 8 reflects red light and blue light and transmits green light, the light of the overlapping band The light of the first polarization state is in the wavelength range of green light, so the light of the first polarization state of the overlapping band that is reflected back will be transmitted from the second light combining element 8, and then illuminate the fluorescent surface of the wavelength conversion element of the green sub-light source 6. Due to the diffuse reflection effect, the light of the first polarization state of the overlapping band is diffusely reflected by the wavelength conversion element to be converted light. The converted light includes the light of the first polarization state of the overlapping band and the light of the second polarization state of the overlapping band. In other words, a part of the original light of the first polarization state of the overlapping band undergoes polarization state conversion and becomes the light of the second polarization state of the overlapping band. The converted light is transmitted from the second light combining element 8. The light of the second polarization state in the overlapping bands in the converted light is then emitted to the first light-combining element 301, and the light of the second polarization state in the overlapping bands in the converted light is reflected by the first light-combining element 301 and enters the light-combining optical path, so that the light of the second polarization state in the overlapping bands in the converted light constitutes a component of the combined light beam, and the light of the second polarization state in the overlapping bands in the converted light is recycled and reused, effectively improving the utilization rate of the wide-spectrum light beam, and the light of the first polarization state in the overlapping bands in the converted light is transmitted out of the first light-combining element 301 again. Due to the action of the guiding element 308, this part of the light will be reflected by the guiding element 308 again and guided back to the first light-combining element 301 and The wavelength conversion element guided by the first light-combining element 301 to the green sub-light source 6 changes this part of light into a part of light of the first polarization state in the overlapping band and a part of light of the second polarization state in the overlapping band due to the diffuse reflection effect, and this cycle is repeated continuously, so that all the light of the first polarization state in the overlapping band in the wide-spectrum light beam originally guided by the first light-combining element 301 is converted into light of the second polarization state in the overlapping band. That is, all the light of the overlapping bands in the original wide-spectrum light beam is merged into the light-combining optical path, which greatly improves the utilization rate of the wide-spectrum light beam, reduces light loss, and improves the brightness of the light output.

[0092] Continue reading Fig.13The narrow spectrum light source 100 includes a second narrow spectrum sub-light source and a third narrow spectrum sub-light source, which are arranged symmetrically in the center. The green laser and the blue laser of the two sub-light sources are packaged together. The green laser and the blue laser of one sub-light source are emitted through a reflector and a dichroic mirror, and the red laser is emitted through a dichroic mirror. The red laser of the other sub-light source is emitted through a reflector and a dichroic mirror, and the green laser and the blue laser are emitted through a dichroic mirror. Then, the three-color laser passes through the high-frequency vibration of the dynamic diffuser 307 to reduce the laser coherence. At the first light homogenizing element 304 (such as a compound eye lens), the three-color lasers of the two sub-light sources form two light spots, which can cover more compound eye units compared to combining two laser beams into one light spot, and can reduce speckle. After the laser is emitted from the first light homogenizing element 304 and passes through the second lens unit 305, it is combined with the wide-spectrum light beam at the first light combining element 301, collimated by the third lens unit 306, and homogenized by the second light homogenizing element 303 before entering the lighting system.

[0093] In one embodiment, Fig.15 As shown, the projection device includes a light source device 210, an illumination system 220 and an imaging system 230. The light source light generated by the light source device 210 is homogenized by a homogenizing element (not shown in the figure), and the illumination system 220 images the light spot emitted by the homogenizing element on a display chip (not shown in the figure). The display chip modulates the incident light source light into image light and irradiates it into the imaging system 230, and finally images the image light onto a projection plane such as a screen to form a projection picture. Among them, the homogenizing element includes an incident surface and an exit surface, and the homogenizing element is used to homogenize the light source light incident from its incident surface. For example, the homogenizing element can be a light rod, a compound eye, etc.

[0094] In addition, the projection device may further include a light source control module (not shown in the figure), which may control the operation of one or more light sources in the light source device 210, so that the light source device 210 emits light of a specified wavelength band required for generating an image. Further, the light source device 210, the illumination system 220, and the imaging system 230 may all be included in the projection optical machine.

[0095] The light source device may include a narrow spectrum light source and a broad spectrum light source, and the narrow spectrum light source and the broad spectrum light source may be one or more light sources, the narrow spectrum light source may be a laser light source, a laser light source, etc., and the broad spectrum light source may be an LED light source or a fluorescent excitation light source, etc. Further, the narrow spectrum light source and the broad spectrum light source may be a single light emitting element or a light emitting element array, and the light emitting element array may include light emitting elements of different colors. For example, the light source may be an LD light source or an LED light source that generates blue light, green light, or red light, or the light source may be a multicolor laser, that is, a light emitting element array containing multiple lasers, such as the light source may contain a blue laser and a red laser, or contain a blue laser and a green laser, or contain a blue laser, a red laser, and a green laser at the same time.

[0096] In some embodiments, the light source light generated by the light source device includes at least a first light, a second light and a third light, wherein at least one of the first light, the second light and the third light includes a narrow spectrum light and a broad spectrum light, the first light has a first color, the second light has a second color, the third light has a third color, the first color and the second color are different, and the third color is different from the first color and the second color or the same as one of the first color and the second color. For example, the first light includes a first narrow spectrum light and / or a first broad spectrum light, the second light includes a second narrow spectrum light and / or a second broad spectrum light, and the third light includes a third narrow spectrum light and / or a third broad spectrum light. For example, the first light includes a green laser and / or a green LED light, the second light includes a red laser and / or a red LED light, and the third light may include a blue laser, a blue LED light, a green LED light, or a red laser, etc. It should be understood that in some other embodiments, the color of the first light may also be red or blue, and the color of the second light may also be blue or green, etc. By mixing narrow spectrum light and broad spectrum light, the advantages of narrow spectrum light and broad spectrum light can be simultaneously included to improve the display effect.

[0097] The illumination system 220 is used to image the light spot emitted by the light source device onto the display chip. In some embodiments, the illumination system may include one or more lenses.

[0098] The imaging system 230 is used to image the image light onto a projection plane such as a screen to form a projection image. The imaging system 230 is generally a lens system, such as a projection lens.

[0099] Figure 16-Figure 20 A timing diagram of a display cycle provided by an embodiment of the present invention. In some embodiments, a display cycle includes a first time period and a second time period, the first time period is used to display an image corresponding to the second color, and the second time period is used to display an image corresponding to the first color. Figure 16-Figure 19 In some embodiments, a display cycle includes a first period, a second period, and a third period. The first period is used to display the image corresponding to the second color, the second period is used to display the image corresponding to the first color, and the third period is used to display the image corresponding to the third color. Figure 18-19 In some embodiments, a display cycle includes a first time period, a second time period, a third time period, a fourth time period and a fifth time period, the first time period is used to display an image corresponding to the second color, the second time period is used to display an image corresponding to the first color, the third time period is used to display an image corresponding to the third color, the fourth time period is used to display an image corresponding to the fourth color, and the fifth time period is used to display an image corresponding to the fifth color, wherein the fourth color can be obtained by mixing the second color and the first color, and the fifth color can be obtained by mixing the first color and the third color, and in this embodiment, the first color, the second color and the third color are different, such as Fig. 20In some other embodiments, a display cycle may also include one time period or four time periods or other number of time periods as long as the display requirements are met. It should be understood that one display cycle of the projection device corresponds to one lighting cycle of the light source device, and the first time period is used to display the image corresponding to the second color, that is, the light source device emits light of the second color in the first time period, and so on.

[0100] It should be noted that a projection device may support only one timing sequence, or may support two or more timing sequences at the same time, with one timing sequence corresponding to one display mode, thereby meeting different scene requirements and improving user experience.

[0101] See also Figure 16-Figure 17 , a display cycle includes a first period and a second period, and the light source device is used to emit a second light of a second color in the first period, emit a first light of a first color in the second period, and emit a second light of a second color in at least part of the second period. Since the first light of the first color and the second light of the second color are emitted in the second period for displaying an image corresponding to the first color, the display brightness is improved, and since the second light is mixed in the timing of the first light, the second light can be supplemented, solving the problem of difficult chip control caused by the small duty cycle of one or more color lights.

[0102] The driving current of the second light emitted by the light source device in the first time period and the second time period may be the same or different, and the type of the second light emitted by the light source device in the first time period and the second time period may be the same or different, such as the second light emitted by the light source device in the first time period is narrow-spectrum light, and the second light emitted in the second time period is broad-spectrum light, or the second light emitted by the light source device in the first time period is broad-spectrum light, and the second light emitted in the second time period is also broad-spectrum light, or the second light emitted by the light source device in the first time period includes narrow-spectrum light and broad-spectrum light, and the second light emitted in the second time period is narrow-spectrum light or broad-spectrum light, or the second light emitted by the light source device in the first time period includes narrow-spectrum light and broad-spectrum light, and the second light emitted in the second time period also includes narrow-spectrum light and broad-spectrum light. Preferably, when the types of the second light emitted by the light source device in the first time period and the second time period are the same, the driving current of the second light emitted by the light source device in the second time period is less than that in the first time period, or / and the duration of the second light emitted by the light source device in the second time period is appropriately reduced. If the second light emitted by the light source device in the first time period and the second time period is narrow spectrum light, the driving current of the second light emitted by the light source device in the second time period can be reduced, or / and the second light is emitted only in part of the second time period, so as to improve the brightness of the system and minimize the impact on the color gamut of the first light. In the embodiment of the present invention, it is preferred that the light source device emits the second light in the entire second time period to reduce the difficulty of light source control.

[0103] Optionally, the light source light emitted by the light source device includes at least two narrow spectrum lights, such as a first narrow spectrum light and a second narrow spectrum light, or a first narrow spectrum light and a third narrow spectrum light, or a first narrow spectrum light, a second narrow spectrum light and a third narrow spectrum light. In this embodiment, the driving current of the first narrow spectrum light may be smaller than that of narrow spectrum lights of other colors. In this embodiment, the first narrow spectrum light is preferably green light, so as to achieve a balance between comprehensive performances such as brightness and color gamut.

[0104] Preferably, the first color is green, and mixing other colors such as red, blue, or yellow in the green light period can more effectively improve the brightness. Further, the second color is preferably red, which can not only improve the brightness, but also achieve a better white balance.

[0105] See also Figure 18-19 , a display cycle includes a first period, a second period and a third period, i.e., a so-called three-segment timing sequence. In this embodiment, the third color is different from the first color and the second color, such as the first color is green, the second color is red, and the third color is blue. In some embodiments, the light source device emits a first light of the first color in the second period and also emits a second light of the second color, such as Fig.18 In some embodiments, the light source device emits a first light of a first color and also emits a third light of a third color during the second period, such as Fig.19 It should be understood that in some other embodiments, the light source device emits the first light of the first color in the second period while also emitting the second light of the second color and the third light of the third color. Figure 16-Figure 17 The same is not introduced in detail here.

[0106] See also Fig. 20 , a display cycle includes the first period, the second period, the third period, the fourth period and the fifth period, which is the so-called five-segment timing. Figure 18-19 The difference is that a display cycle also includes a fourth period of time in which the first color and the second color of light are emitted simultaneously, and a fifth period of time in which the first color and the third color of light are emitted simultaneously. Although the fourth period of time and the second period of time both emit the first color and the second color of light simultaneously, there is an essential difference between the two periods. The fourth period of time is the period of the fourth color, and the second period of time is the period of the first color. Similarly, the fifth period of time and the Fig.19 There are also essential differences in the second time period in the illustrated embodiment. Optionally, the intensity of the second light emitted by the light source device in the second time period may be less than that in the fourth time period or / and the first time period (e.g., the driving current of the second light emitted by the light source device in the second time period may be less than that in the fourth time period or / and the first time period), and the intensity of the second light emitted by the light source device in the first time period and the fourth time period may be the same or different, or the intensity of the first light emitted by the light source device in the second time period is greater than that in the fourth time period, thereby reducing the impact on the color gamut of the first light.

[0107] In some embodiments, when the light source device does not emit the second light in the second time period, the duration of the first time period accounts for the largest proportion in the entire display cycle. Taking the five-segment timing as an example, the first time period of a display cycle accounts for 37%, the second time period accounts for 8%, the third time period accounts for 25%, and the other time periods account for 30% (such as the fourth time period accounts for 19%, and the fifth time period accounts for 11%). The second time period accounts for a small proportion, and the chip control is difficult. If the proportion of the second time period is increased by reducing the current, the brightness will decrease. When the light source device emits the second light in the second time period, it is not necessary to increase the proportion of the second time period by reducing the current, which reduces the difficulty of chip control and can also increase the brightness. Further, in the entire display cycle, the duration of the second time period can account for the largest proportion, such as the first time period of a display cycle accounts for 22%, the second time period accounts for 28%, the third time period accounts for 20%, the fourth time period accounts for 19%, and the fifth time period accounts for 11%, thereby ensuring that the display screen can also meet the target white balance condition when the second light is also emitted in the second time period.

[0108] Fig. 22 Schematic diagram of functional modules of a projection device provided by an embodiment of the present invention. Fig. 22 As shown, the projection device includes an image processor 110 and a projection optical engine 120. Among them:

[0109] The image processor 110 may be a microcontroller, a dedicated image processing chip, etc. The microcontroller may be an ARM chip, a microcontroller unit (MCU), etc. The dedicated image processing chip may be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processor (NPU), etc. The image processor 110 may be used for video decoding, image quality processing, etc.

[0110] The projection optical machine 120 may include a driving chip, a display chip, and a light source. The light source may include a laser light source, an LED light source, a fluorescent light source, etc. The display chip may be a digital micromirror device (DMD), a liquid crystal display (LCD), a liquid crystal on silicon (LCOS), etc., which is used to modulate the light source to generate image light. The driving chip corresponds to the display chip, for example, the digital micromirror device may be driven by a digital light processing element (DLP). The projection optical machine 120 is used to project the image to be projected into a projection screen.

[0111] In some embodiments, the projection device further includes a central controller 130 having one or more processing cores, which may be a CPU, ARM, MCU or other controller. The central controller 130 is the control center of the projection device, and uses various interfaces and lines to connect various parts of the entire projection device, and can run or execute software programs and / or operating systems stored in the storage module 140, and call data stored in the storage module 140. Optionally, the image processor 110 and the central controller 130 may be integrated into one processor.

[0112] In some embodiments, the projection device further includes components such as a storage module 140 of one or more computer-readable storage media, an input module 150, and a communication module 160. Those skilled in the art will appreciate that Fig. 22 The structure of the projection device shown in the figure does not constitute a limitation on the projection device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0113] The storage module 140 can be used to store software programs and operating systems. The central controller 130 executes various functional applications and data processing by running the software programs and operating systems stored in the storage module 140. The storage module 140 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the projection device, etc. In addition, the storage module 140 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the storage module 140 may also include a memory controller to provide the central controller 130 with access to the storage module 140.

[0114] The projection device may further include an input module 150, which may be used to receive input digital or character information and generate remote controller, keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0115] The projection device may further include a communication module 160. In some embodiments, the communication module 160 may include a wireless module. The projection device may perform short-distance wireless transmission through the wireless module of the communication module 160, thereby providing the user with wireless broadband Internet access. For example, the communication module 160 may be used to help the user access streaming media, etc.

[0116] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A light source device, characterized in that: The invention comprises a narrow spectrum light source, a wide spectrum light source and a first light combining element, wherein a narrow spectrum light beam emitted by the narrow spectrum light source and a wide spectrum light beam emitted by the wide spectrum light source are emitted to the first light combining element to be combined and emitted, the narrow spectrum light beam emitted by the narrow spectrum light source and the wide spectrum light beam emitted by the wide spectrum light source have overlapping wavelength bands, and the narrow spectrum light beam emitted by the narrow spectrum light source comprises light of a first polarization state in the overlapping wavelength band; The first light combining element transmits the narrow spectrum light beam emitted by the narrow spectrum light source, and reflects the light of the second polarization state of the overlapping band and the light of the remaining bands in the wide spectrum light beam emitted by the wide spectrum light source excluding the overlapping band; or, the first light combining element reflects the narrow spectrum light beam emitted by the narrow spectrum light source, and transmits the light of the second polarization state of the overlapping band and the light of the remaining bands in the wide spectrum light beam emitted by the wide spectrum light source excluding the overlapping band.

2. The light source device according to claim 1, characterized in that: The invention also includes a first light homogenizing element arranged on the optical path of a narrow spectrum light beam emitted by a narrow spectrum light source, wherein the narrow spectrum light beam emitted by the narrow spectrum light source has a rectangular or elliptical light spot, and the first light homogenizing element homogenizes the narrow spectrum light beam, and adjusts the light spot shape of the incident narrow spectrum light beam to a regular polygon or a rectangle with unequal length and width, wherein the long side of the light spot of the narrow spectrum light beam incident on the first rectangular incident surface of the first light homogenizing element is parallel to the long side of the first rectangular incident surface.

3. The light source device according to claim 2, characterized in that: It also includes a second lens unit, which is located on the optical path of the narrow-spectrum light beam emitted by the first light homogenizing element and is used to reduce the divergence angle of the incident narrow-spectrum light beam. The second light homogenizing element is arranged on the light path of the combined light output of the first light combining element. The second lens unit makes the spot size of the narrow-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element smaller than or equal to the second rectangular incident surface.

4. The light source device according to claim 3, characterized in that: The second light homogenizing element is used to adjust the shape of the light spot into a rectangle, so that the long side of the rectangular light spot of the light source light emitted by the combined light to the third rectangular incident surface of the light modulator is parallel to the long side of the third rectangular incident surface, and the light spot of the wide-spectrum light beam incident on the second rectangular incident surface of the second light homogenizing element covers the light spot of the narrow-spectrum light beam.

5. The light source device according to claim 3, characterized in that: The distance between the second lens unit and the first light homogenizing element is greater than or equal to 0.1 mm and less than or equal to 10 mm.

6. The light source device according to claim 3, characterized in that: A first lens unit is also provided on the optical path from the broadband light source to the first light combining element, and is used to shape the incident broadband light beam in at least one of the first direction and the second direction, so that the ratio of the spot size of the broadband light beam incident to the second rectangular incident surface in the first direction and the second direction is related to the ratio of the long side to the short side of the second rectangular incident surface, and the incident angle of the broadband light beam incident to the second rectangular incident surface corresponding to the first direction is smaller than that in the second direction, and the first direction is perpendicular to the second direction.

7. The light source device according to claim 6, characterized in that: It also includes a third lens unit, which is located on the optical path of the narrow spectrum light beam emitted by the second lens unit and the wide spectrum light beam emitted by the first lens unit, and is used to collimate the incident light beam so that the optical axes of the lights incident on the second rectangular incident surface coincide.

8. The light source device according to any one of claims 1 to 7, characterized in that: The broadband light source includes an excitation light source and a wavelength conversion element. The wavelength conversion element is irradiated by the excitation light source to generate a broadband light beam. The broadband light source also includes a guiding element. The guiding element is arranged on an output light path of light of the first polarization state in the overlapping band in the broadband light beam guided by the first light combining element. The light of the first polarization state in the overlapping band is returned and guided to the fluorescent surface of the wavelength conversion element by the guiding element. The light of the first polarization state in the overlapping band is diffusely reflected by the wavelength conversion element to become converted light. The converted light includes light of the first polarization state in the overlapping band and light of the second polarization state in the overlapping band. The converted light is emitted to the first light combining element.

9. The light source device according to claim 8, characterized in that: The guiding element reflects light of the first polarization state in the overlapping bands, and the light of the first polarization state in the overlapping bands in the wide-spectrum light beam emitted from the first light combining element is reflected back to the first light combining element by the guiding element and then guided to the wavelength conversion element by the first light combining element.

10. The light source device according to claim 8, characterized in that: When the excitation light source irradiates the wavelength conversion element, the residual excitation light that is not excited and converted is guided out by the first light combining element, and the residual excitation light is emitted in the same direction as the light of the first polarization state in the overlapping band of the wide-spectrum light beam. The residual excitation light is returned by the guiding element and guided to the wavelength conversion element for re-excitation.

11. The light source device according to claim 8, characterized in that: The wavelength conversion element is dynamically movable and includes at least one wavelength conversion region. Light of the first polarization state in the overlapping wavelength band is reflected by the fluorescent surface of the wavelength conversion region to become converted light.

12. The light source device according to claim 8, characterized in that: The excitation light source and the guiding element are located on the same side of the first light combining element; The guiding element reflects light of the first polarization state in the overlapping band and transmits the excitation light emitted by the excitation light source; or, the guiding element is coated in partitions, and a part of the area of ​​the guiding element is used for allowing the excitation light emitted by the excitation light source to pass through; or, the guiding element is set off-axis relative to the optical path of the excitation light emitted by the excitation light source.

13. The light source device according to claim 8, characterized in that: The guiding element is connected to the first light combining element as a whole.

14. The light source device according to any one of claims 1 to 7, characterized in that: The broad spectrum light beam includes a plurality of different broad spectrum bands, and the narrow spectrum light beam includes a plurality of different narrow spectrum bands, and at least one broad spectrum band and one narrow spectrum band have an overlapping band.

Images