WO2021135961A1

WO2021135961A1 - Light source device and projection apparatus

Info

Publication number: WO2021135961A1
Application number: PCT/CN2020/137093
Authority: WO
Inventors: 郭祖强; 陈晨; 莫美妮; 胡飞; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2019-12-31
Filing date: 2020-12-17
Publication date: 2021-07-08
Also published as: CN113132698A

Abstract

Embodiments of the present application provide a light source device, comprising a light source, an optical expansion assembly, and a light combining assembly. The light source comprises a laser module and a fluorescent module, the laser module is used for emitting laser light, and the fluorescent module is used for emitting fluorescent light. The optical expansion assembly is used for increasing the optical expansion amount of the laser light, so that the difference between the increased optical expansion amount of the laser light and the optical expansion amount of the fluorescent light is less than or equal to a preset threshold. The light combining assembly is used for combining the fluorescent light with the laser light expanded by the optical expansion assembly and emitting the combined light. By optically expanding laser rays having a small optical expansion amount and relatively concentrated energy, the optical expansion amount of the laser rays is increased, the heat of the laser light is prevented from being excessively concentrated and from burning or aging parts in the light source device, and the reliability of the light source device is improved. Moreover, the embodiments of the present application further provide a projection apparatus.

Description

Light source device and projection equipment

Technical field

This application relates to the field of light source technology, and in particular to a light source device and projection equipment.

Background technique

In the projection display, according to the spatial light modulator used in the projection display, it can be divided into LCD projection display, LCOS projection display and DLP projection display. Both transmissive LCD display devices and reflective silicon-based LCOS display devices work under polarized light. The white light source is non-polarized natural light and cannot directly illuminate these two display devices. Therefore, a polarizing device is needed to convert natural light into polarized light. . Although the spatial light modulator of the DLP projection display system is not required to be polarized light, when applied to 3D display, if the light emitted from the lens undergoes polarization conversion, half of the light will be lost.

Commonly used polarizing devices include PBS (Polarizing Beam Splitter) and PCS (polarization conversion system). The polarizing beam splitter PBS can split the incident non-polarized light into two vertical linearly polarized light beams. The P-polarized light passes completely, and the S-polarized light is reflected at a 45-degree angle, and the exit direction is at a 90-degree angle with the P light. The polarization converter PCS connects multiple PBS prisms together, and installs 1/2 glass slides at each P optical path to convert the P polarization state light into S polarization state light, so that the light emitted from the polarization converter There is only one polarization state. Since the glue is needed to bond between the PBS, 1/2 glass slide, etc., and the glue is an organic material that cannot withstand high temperature, when the temperature is too high, it will accelerate the aging of the glue, which will make the reliability of the PCS worse.

Summary of the invention

The purpose of the present application is to provide a light source device and projection equipment, which can prevent the energy of the laser light from being too concentrated, and reduce the possibility that the components in the light source device are damaged by the laser light.

In the first aspect, the embodiments of the present application provide a light source device, including a light source, an optical expansion assembly, and a light combining assembly. The light source includes a laser module and a fluorescent module. The laser module is used to emit laser light, and the fluorescent module is used to Emit fluorescent light. The optical expansion component is used to expand the optical expansion of the laser light so that the difference between the optical expansion of the expanded laser light and the optical expansion of the fluorescent light is less than or equal to a preset threshold. The light combining component is used to combine the fluorescent light and the laser light expanded by the optical expansion component and emit it.

In some embodiments, the optical expansion component includes a homogenization component and a lens. The homogenization component is used to homogenize the laser light emitted by the laser module, and the lens is used to condense and emit the homogenized laser light.

In some embodiments, the optical extension component further includes a reflector, which is used to reflect the converged laser light to the light combining component.

In some embodiments, the light source device further includes a polarizing device, which receives the light emitted by the light combining component and converts it into a polarization state for output.

In some embodiments, the light combining component includes a first surface and a second surface that are away from each other. The fluorescent light is incident on the second surface and passes through the light combining component and exits through the first surface. The optically expanded laser light is incident on the first surface. One surface.

In some embodiments, the optical expansion of the fluorescent light on the first surface is the same as the optical expansion of the laser light on the first surface.

In some embodiments, the light source device further includes a first lens group, and the first lens group is disposed between the light combining component and the light homogenizing component, and between the light combining component and the laser module.

In some embodiments, the first surface is covered with a reflective film. The reflective film includes a first area and a second area. The second area surrounds the first area. The second area transmits light with a wavelength higher than a predetermined wavelength, and the reflection is lower than the predetermined wavelength. Assuming wavelengths of light, the first area reflects all wavelengths of light, the optically expanded laser light is incident on the first area and the second area, and the fluorescent light is incident on the second surface and passes through the second area.

In some embodiments, the fluorescent module includes a wavelength conversion device, the fluorescent module includes a wavelength conversion device, and a second laser module. The second laser module emits second laser light in the S polarization state. The second laser light emitted by the two laser modules is converted into fluorescent light.

In some embodiments, the fluorescent module further includes a guiding device for guiding the second laser light to the wavelength conversion device and guiding the fluorescent light to exit.

In some embodiments, the wavelength conversion device converts at least a part of the laser light that has not been converted into fluorescence into laser light in the P polarization state, and the fluorescence and the laser light in the P polarization state are combined by the guiding device and then emitted.

In some embodiments, the first surface is covered with a reflective film, the reflective film includes a first area and a second area, the second area surrounds the first area, non-blue light is incident on the first area, and the first area has a P polarization state. And reflects the light with the S polarization state, the second region transmits the light with the P polarization state, and reflects the light with the S polarization state of less than the preset wavelength.

In the second aspect, an embodiment of the present application also provides a projection device, which is installed with the above-mentioned light source device.

The light source device and projection equipment provided by the present application optically expand the laser line with a small amount of optical expansion and relatively concentrated energy, thereby increasing the amount of optical expansion of the laser light, and avoiding the heat of the laser from being too concentrated, so as to avoid damage to the components in the light source device. Produce burns or aging, and improve the reliability of the light source device. The projection equipment installed with the above-mentioned light source device has a longer service life and higher reliability.

These and other aspects of the application will be more concise and understandable in the description of the following embodiments.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a light source device provided by the first embodiment of the present application;

FIG. 2 is a schematic structural diagram of a light combining component provided in an embodiment of the present application;

FIG. 3 is a graph of the coating curve of the first region of a light combining component provided in the first embodiment; FIG.

4 is a graph of the coating curve of the second area of the light combining component provided in the first embodiment;

FIG. 5 is a graph of the coating curve of the second area of another light-combining component provided in the first embodiment;

6 is a schematic structural diagram of a light source device provided by a second embodiment of the present application;

FIG. 7 is a schematic structural diagram of a light source device provided by a third embodiment of the present application;

FIG. 8 is a schematic diagram of a partial structure of a light source device according to a fourth embodiment of the present application;

9 is a graph of the coating curve of the first region of a light combining component provided in the fourth embodiment;

FIG. 10 is a graph of the coating curve of the first region of another light-combining component provided in the fourth embodiment;

11 is a graph of the coating curve of the second area of a light combining component provided in the fourth embodiment;

FIG. 12 is a graph of the coating curve of the second region of another light-combining component provided in the fourth embodiment;

FIG. 13 is a schematic structural diagram of a projection device provided by a fifth embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Compared with the laser light emitted by the laser module, the fluorescence produced by the fluorescent module usually has a larger optical expansion. The optical expansion refers to the cross-section perpendicular to the axis when the light emitted by the light source propagates along its axis. Sectional area. The laser module may include, for example, a blue laser light source and a non-blue laser light source, and the non-blue laser light source may be a red light source, a green light source, and the like. Since the wavelength of blue light is shorter than that of red and green light, its energy is higher. When the blue light converges, it will increase the local temperature of the irradiated area. If there is glue in the irradiated area, it may melt the glue or accelerate the aging speed of the glue. Therefore, the inventor proposes the light source device and the projection device in the embodiments of the present application. Hereinafter, each embodiment of the present application will be described in detail with reference to the accompanying drawings.

The first embodiment

1, this embodiment provides a light source device 10a, which includes a light source 100, an optical expansion assembly 200, and a light combining assembly 300. The light source 100 includes a fluorescent module 103 and a laser module 101. The fluorescent module 103 is used to emit fluorescence. The laser module 101 is used to emit laser light, the optical expansion assembly 200 is used to expand the optical expansion of the laser light in the light source 100, and the light combining assembly 300 is used to combine the optically expanded laser light and fluorescent light. deal with.

Specifically, in this embodiment, the laser module 101 includes a blue light source 1011 for generating blue laser light. Compared with other colors of laser light, blue laser light has a shorter wavelength and higher energy, so it is easier for the light source device 10a to Other parts in the product have adverse effects. In some other embodiments, the laser module 101 may also be a laser light source of other colors. And in some embodiments, the laser module 101 may include two or more colors of laser light sources, and at this time, the optical expansion assembly 200 may selectively optically expand only a part of the laser light emitted by the laser light sources. Of course, the optical expansion assembly 200 can also optically expand all laser light.

In this embodiment, the laser module 101 further includes one or more red light sources 1021 and one or more green light sources 1022. In some embodiments, the laser light emitted by the light sources of each color in the laser module 101 may be incident on the light combining assembly 300 parallel to each other. In some other embodiments, the light paths of the laser lights of different colors emitted in the laser module 101 may not be parallel to each other, but are incident on the light combining assembly 300 after one or more reflections. It can be understood that, in some embodiments, the laser light of various colors emitted by each laser light source in the laser module 101 has the same optical extension when it exits.

As an implementation, in this embodiment, the optical paths of the red light source 1021 and the green light source 1022 are parallel to each other, and the optical path of the laser light emitted from the blue light source 1011 is the same as that of the laser light emitted from the red light source 1021 and the green light source 1022. The optical paths of the light rays are roughly perpendicular to each other.

The optical expansion assembly 200 is used to expand the optical expansion of the laser light. The optical expansion assembly 200 is arranged between the laser module 101 and the light combining assembly 300. Specifically, in this embodiment, the optical expansion assembly 200 is arranged at the blue light source 1011 and Between the light combining components 300 and used to optically expand the blue laser light emitted by the blue light source 1011, the laser light emitted by the red light source 1021 and the green light source 1023 are not optically expanded by the optical expansion component 200. After the expansion of the optical expansion assembly 200, the optical expansion of the blue laser light emitted by the blue light source 1011 increases, so that the optical expansion of the blue laser line after optical expansion can be greater than that of other colors of laser light. the amount.

As an embodiment, the optical expansion assembly 200 includes a homogenization component 201 and a lens 202. The homogenization component 201 is used to homogenize the laser light emitted by the blue light source 1011. In this embodiment, the homogenization component 201 is a single fly-eye lens, and The lens unit of the single fly-eye lens faces the direction of the blue light source 1011.

The lens 202 receives and emits the blue light rays homogenized by the homogenization component 201 to converge and emit. Through the action of the homogenization component 201 and the lens 202, the optical extension of the blue laser light emitted by the blue light source 1011 increases.

In this embodiment, the optical extension assembly 200 further includes a reflector 203. The reflector 203 can be arranged between the lens 202 and the light combining assembly 300. It can be understood that the reflector 203 here is arranged between the lens 202 and the light combining assembly 300. Time means that the reflecting mirror 203 is located in the optical path from the lens 202 to the light combining assembly 300. The reflecting mirror 203 is used to reflect the converged blue laser light to the light combining assembly 300. The reflector 203 can change the angle of the blue laser light and make the blue laser light reach a predetermined optical extension after being reflected. Therefore, the optical extension of the blue laser light can be adjusted by changing the setting angle of the reflector 203.

In this embodiment, the light source device 10a further includes a first lens group 400. The first lens group 400 is disposed between the light combining component 300 and the light homogenizing component 201, and is located between the light combining component 300 and the red light source 1021 and the green light source. Between 1022, the first lens group 400 can include one or more lenses 202, and the first lens group 400 can transmit laser light of various colors. For example, in this embodiment, the first lens group 400 transmits through optically expanded The blue laser light, the red laser light and the green laser light are converged to make the incident area of the red laser light and the green laser light on the light combining assembly 300 as small as possible. At the same time, the first lens group 400 can adjust the incident area of the optically expanded blue laser light on the light combining assembly 300.

1 and 2 together, the light combining assembly 300 is used to converge and emit laser light. The light combining assembly 300 includes a first surface 301 and a second surface 302 that are away from each other, wherein the first surface 301 is used for receiving And reflect the laser light. The first surface 301 is covered with a reflective film 310. The reflective film 310 includes a first area 311 and a second area 312. The second area 312 surrounds the first area 311, and the area of the second area 312 is larger than that of the first area 311. The laser light that has not been optically expanded is incident on the first area 311, and the laser light that has been optically expanded is incident on the first area 311 and the second area 312 at the same time. Specifically, in this embodiment, the blue laser light is incident on the first area 311 and the second area 312 at the same time, and the red laser light and the green laser light are incident on the first area 311.

The fluorescent module 103 is used to emit fluorescent light, and the fluorescent light emitted by the fluorescent module 103 is incident on the light combining assembly 300. The fluorescent module 103 may include a laser light source and a wavelength conversion device, for example, wherein the laser light source is used to generate the second laser light. The second laser light enters the wavelength conversion device and then excites the wavelength conversion device and is converted into fluorescence. The wavelength conversion device may be, for example, a fluorescent color wheel. The fluorescent color wheel may be provided with phosphors of a predetermined color. When the second laser light enters When reaching the wavelength conversion device, the phosphor is excited to form fluorescence of the color corresponding to the phosphor.

In this embodiment, the fluorescent light emitted by the fluorescent module 103 is incident on the second surface 302 and passes through the light combining component 300 and exits through the first surface 301. The light combining component 300 combines the fluorescent light and the laser light to emit the light together. In this embodiment, the fluorescent light irradiates all or part of the area of the second surface 302, which includes at least a part corresponding to the first area 311 and at least a part corresponding to the second area 312. In addition, the reflective film 310 covering the first surface 301 reflects most of the fluorescent light in the first area 311, and the reflected fluorescent light is lost, while the fluorescent light is transmitted in the second area 312. In order to improve the utilization rate of fluorescence, the area of the first region 311 can be minimized to reduce the proportion of fluorescence reflected. For example, the ratio of the area area of the first area 311 to the area area of the second area 312 may be less than the area threshold. The area threshold may be, for example, 5-25%. Of course, the area threshold may also be other values.

The difference between the optical expansion of the optically expanded laser light and the optical expansion of the fluorescent light is less than or equal to the preset threshold, where the optical expansion of the fluorescent light on the first surface and the optically expanded laser light are in the first The difference in the optical expansion of the surface refers to the absolute value of the difference between the optical expansion of the fluorescent light on the first surface and the optical expansion of the optically expanded laser light on the first surface. The preset threshold may be, for example, an optical expansion amount of 0-1 units. Just as an example, for example, the optical expansion of the fluorescence is 1 unit, and the optical expansion of the laser light after optical expansion is 0.97 units. At this time, the difference between the optical expansion of the two is (1-0.97)=0.03 Unit, where the unit can be an area unit, for example, 1 unit can refer to 1dm ² , 1cm ² , 1mm ^2, etc. As an embodiment, the optical expansion of the fluorescence may be greater than the optical expansion of the laser light after optical expansion.

In particular, in some embodiments, when the preset threshold value is 0, the optical expansion of the fluorescence on the first surface is the same as the optical expansion of the optically expanded laser light on the first surface. In this way, after the optically expanded laser light and fluorescence are mixed, the imaging quality and color uniformity of the laser light can be improved, and the energy density of the laser light can be reduced.

In order to make all the non-blue laser light reflected by the reflective film 310 and the fluorescent light can pass through the second region 312, in some embodiments, the coating curve of the reflective film 310 is shown in FIG. 3, and the first region 311 reflects All wavelengths of light are just an example. The average wavelength of blue laser light is approximately 465 nm, the average wavelength of green light is approximately 525 nm, and the average wavelength of red laser light is approximately 638 nm. It should be noted that the reflection of laser light of all wavelengths here means that the transmittance of laser light of all wavelengths in the first region 311 is less than or equal to the minimum transmittance threshold, and the minimum transmittance threshold can be less than 0.1. For example, the minimum transmittance threshold may be 0.02.

As shown in FIG. 4, the second region 312 transmits light with a wavelength higher than a predetermined wavelength, and reflects light with a wavelength lower than the predetermined wavelength. The preset wavelength can be matched with the wavelength of the fluorescent light, so that the second region 312 can transmit the fluorescent light and reflect the blue laser light. For example, the preset wavelength can be set to be larger than the wavelength of the blue laser light and smaller than the wavelength of the fluorescent light. In the form, for example, the preset wavelength may be 470 nm. It can be understood that the transmission of light higher than the preset wavelength means that the transmittance of light higher than the preset wavelength is greater than or equal to the maximum transmittance threshold, and the maximum transmittance threshold may be 1.

In another embodiment, the coating curve of the second region 312 can also be performed in the form shown in FIG. 5: the second region 312 transmits light with a wavelength lower than the first predetermined wavelength and higher than the second predetermined wavelength. For light of a wavelength, the first predetermined wavelength is smaller than the second predetermined wavelength, and the first predetermined wavelength may be smaller than the minimum wavelength of the blue light, and the second predetermined wavelength may be greater than the maximum wavelength of the blue light. For example, the first preset wavelength may be 460 nm, and the second preset wavelength may be 470 nm. At this time, the blue light can also be reflected when it enters the second area 312 without passing through the light combining component 300, and at the same time, the fluorescence can pass through the second area 312.

In some embodiments, the light source device 10a may also optionally include a second lens group 500, a fly-eye lens group 600, and a polarizing device 700. The light emitted by the combined light assembly 300 may be emitted through the second lens group 500, the fly-eye lens group 600, and the polarizing device 700 in sequence.

It is understandable that the second lens group 500 may include one or more lenses, the light is straightened after passing through the second lens group 500, and the straightened light enters the fly-eye lens group 600, and the fly-eye lens group 600 may be a double compound eye. Structure, and the double compound eyes are set in mirror image. After the light passes through the fly-eye lens group 600, the expansion amount of the light spot can be increased, and the light energy density can be made more uniform at the same time. The polarizing device 700 receives the light emitted from the light combining assembly 300 and transmitted through the fly-eye lens group 600 and converts it into a polarization state for output, for example, converts it into a P polarization state or an S polarization state. The polarizing device 700 may be, for example, a PCS (polarization conversion system), and the polarizing device 700 is usually provided with glue for bonding. When the optically expanded blue light enters the fly-eye lens group 600, the spread angle is increased. Therefore, when the light passes through the fly-eye lens group and enters the polarizing device 700, the light energy density is reduced and will not be on the polarizing device 700. A local high temperature is formed, thereby reducing the risk of melting or aging of the glue on the polarizing device 700, and effectively improving the reliability of the polarizing device 700.

The light source device 10a provided in this embodiment optically expands the laser light emitted by the laser module 101, so that the laser light will not be too concentrated, and avoid the high temperature generated by the concentrated laser light when passing through the device to cause other components Adverse effects, such as aging and deformation of the glue. At the same time, since the laser light is homogenized through the light homogenizing component 201, the angle of the exit spot of the laser light is increased. Through the reshaping of the optical system, the spot size of the laser is enlarged and uniformly distributed on the light combining assembly 300, and the spot size of the laser light becomes larger, so that the optical power density per unit area of the polarizing device 700 is reduced. The energy per unit area of the polarizing device 700 is reduced, which avoids the problem of accelerated glue aging due to excessive local temperature. In turn, the reliability of the polarizing device 700 is improved. It will also improve the image quality of the laser light and improve the color uniformity.

The light source device 10a provided in this embodiment can be applied to various types of projection equipment, for example, and used as a light source of the projection equipment.

Second embodiment

Referring to FIG. 6, this embodiment provides a light source device 10c. The difference from the first embodiment is that in this embodiment, the light homogenizing component 201 is a diffuser. For the structure of other parts, please refer to the first embodiment. I won't repeat them here.

Since the angle of the laser light emitted by the blue light source 1011 in the laser light source 101 is very small, the divergence angle is enlarged by the diffuser, and the angular distribution of the blue laser light with the enlarged divergence angle is converted into the surface distribution through the action of the lens 202, so that the image is formed The light spot distribution on the light combining assembly 300 becomes larger, and the light spot area that is finally converted to incident on the polarizing device 700 becomes larger, which can also achieve the same or similar technical effect as the light source device 10a provided in the first embodiment. In addition, since the processing cost of the heat sink is lower than that of a single fly-eye lens, the cost of the light source device 10c can be reduced.

The third embodiment

Referring to FIG. 7, this embodiment provides a light source device 10d. The difference from the first embodiment is that in this embodiment, the light homogenizing component 201 is a scattering wheel. For the structure of other parts, please refer to the first and second embodiments. For example, I won’t repeat them here.

The scattering wheel expands the laser light emitted by the blue light source 1011 in the laser light source 101, so that the expansion amount of the blue laser light becomes larger and the distribution is uniform. By controlling the scattering degree of the scattering wheel to expand the blue laser light through the scattering wheel, the expansion amount of the blue laser light is consistent with the expansion amount of the fluorescent light, which is conducive to the subsequent light combining and homogenization, and also makes the projection display system The color display effect is better. And it has a better effect of blue light to disperse spots.

Fourth embodiment

Referring to FIG. 8, this embodiment provides a light source device 10e. Compared with the light source device 10a in the first embodiment, the structure of the fluorescent module 103 is different in the light source device 10e in this embodiment. In this embodiment, the fluorescent module 103 includes a wavelength conversion device 1033, a guiding device 1032, and a second laser module 1031. The second laser module 1031 emits a second laser light having an S polarization state. The second laser module 1031 emits blue laser light with S polarization state as the second laser light, the guiding device 1032 receives and reflects the second laser light emitted by the second laser module 1031, and the wavelength conversion device 1033 receives it through the guiding device The second laser light reflected by 1032 generates the received laser light as fluorescence. The fluorescence passes through the guiding device 1032 again and exits through the guiding device 1032. The guiding device 1032 can transmit light corresponding to the wavelength of the generated received laser light and the second laser light having the P polarization state.

The wavelength conversion device 1033 may be, for example, a fluorescent wheel, which can generate fluorescence under the excitation of the second laser light.

Since the wavelength conversion device 1033 converts the blue second laser light, there may be some cases where the second laser light is not converted. Therefore, in some embodiments, the wavelength conversion device 1033 is also used to convert at least a part of the second laser light that has not been converted into fluorescence into a second laser light of the P polarization state, and is converted into a second laser light of the P polarization state. The light is incident on the guiding device 1032, and the fluorescent light and the second laser light of the P polarization state are combined by the guiding device 1032 and then emitted. In this way, the utilization rate of the second laser light emitted by the second laser module 1031 can be improved, and the loss of light can be reduced. At the same time, the second laser light with the P polarization state is mixed in the fluorescence, which can increase the light after the subsequent combination with the laser light. Uniformity.

After multiple scattering, at least part of the laser light that has not been converted by the wavelength conversion device 1033 is converted into laser light having a P polarization state. In some embodiments, the fluorescent module 103 may also optionally include a first lens 1035, which is located between the scattering device 1034 and the guiding device 1032, which can act as a protection against fluorescence and laser light in the P polarization state. Convergence, the fluorescence and P-polarized laser light enter the guiding device 1032 and then exit through the guiding device 1032.

On the optical path of the fluorescent light emitted by the fluorescent module 103, a second lens 1036 may also be provided. The second lens 1036 guides the fluorescent light emitted from the guiding device 1032 to the light combining assembly 300. The second lens 1036 may also The fluorescent light emitted by the fluorescent module 103 is straightened.

In this embodiment, the blue light source 1011, the red light source 1021, and the green light source 1022 in the laser module 101 all emit light in the S polarization state. The configuration of the laser module 101 can refer to the related content in the first embodiment. . The light combining component 300 can transmit light corresponding to the wavelength of the fluorescent light and laser light having a P polarization state.

As an embodiment, the first surface 301 of the light combining assembly 300 is covered with a reflective film 310. The reflective film 310 includes a first area 311 and a second area 312. The second area 312 surrounds the first area 311 without optical expansion. The laser light is incident on the first area 311. Referring to FIG. 9, the first region 311 transmits light with a P polarization state of less than a predetermined wavelength, and reflects light with an S polarization state. In this embodiment, the second laser light with the P polarization state in the fluorescent module 103 is only blue light, so it only needs to be able to pass through the blue light. Therefore, the preset wavelength can be greater than or equal to the blue light. The maximum wavelength is sufficient. As an implementation manner, the preset wavelength may be 470 nm.

It is understandable that the transmitted light here means that the transmittance of light is higher than the maximum transmittance threshold, for example, the transmittance of light is 1. The maximum transmittance threshold can also be 0.9, 0.95, and other values. The reflected light here means that the transmittance of the light is less than or equal to the minimum transmittance threshold, where the minimum transmittance threshold may be 0.1, 0.05, etc., for example.

In this way, both the fluorescence emitted by the fluorescent module 103 and the blue second laser light having the P polarization state can pass through the first region 311. Since the laser light emitted by the laser module 101 is in the S polarization state, it will be completely reflected by the first area 311 and cannot pass through the first area 311.

In some other embodiments, referring to FIG. 10, the first region 311 can also transmit light with P polarization of all wavelengths, and the above technical effects can also be achieved in this case.

Referring to FIG. 11, the second region 312 transmits light with the P polarization state, and reflects light with the S polarization state of less than a predetermined wavelength. That is, the second area 312 can also transmit fluorescent light and the second laser light having the P polarization state, and reflect the light having the S polarization state less than the preset wavelength. Since the non-blue light is only incident on the first region 311, it is only necessary to prevent the blue laser light of the S polarization state from passing through the light combining assembly 300. At this time, the preset wavelength can be matched with the wavelength of the blue laser light, for example The preset wavelength is set to be greater than or equal to the maximum wavelength of the blue laser light. As an implementation manner, the preset wavelength may be 470 nm.

Referring to FIG. 12, in some embodiments, the second region 312 may also reflect laser light having an S polarization state greater than the first preset wavelength and less than the second preset wavelength, where the first preset wavelength may be less than or equal to blue. The minimum wavelength of the color laser light, and the second preset wavelength may be greater than or equal to the maximum wavelength of the blue laser light. As an implementation manner, the first preset wavelength may be 460 nm, and the second preset wavelength may be 470 nm.

Since the reflective film 310 is configured to reflect or transmit according to the polarization state of the light, this prevents the fluorescent light from being unable to transmit through the light combining assembly 300 in the first region 311, which causes the loss of fluorescence, thereby improving the utilization of fluorescence.

It should be noted that the structure and arrangement of other parts in this embodiment can refer to the relevant content of the foregoing embodiments, and will not be repeated here.

The light source device 10e provided in this embodiment converts the blue second laser light emitted by the second laser module 1031 to obtain fluorescence, which can improve the uniformity of fluorescence. At the same time, the scattering device 1034 is further used to convert the unconverted blue second laser light of the S polarization state into the blue second laser light of the P polarization state to improve the utilization rate of the light. At the same time, because the blue second laser light is mixed in the fluorescence Laser light can improve the mixing uniformity of fluorescence, blue laser light and other colors of laser light, thereby improving color uniformity.

Fifth embodiment

Referring to FIG. 13, this embodiment provides a projection device 1 in which a light source device 10a is provided. It can be understood that, although not shown in FIG. 13, the projection device 1 may also optionally include a processor and a connection port. , Bluetooth module and other components.

It should be noted that the light source device 10b in this embodiment can also be replaced by the light source device disclosed in any of the foregoing embodiments or its implementation, which is not limited in this embodiment.

Since the projection device 1 in this embodiment uses the light source device 10a, the light source device 10a is more stable and has a longer service life.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A light source device, characterized in that it comprises:

A light source, the light source includes a laser module and a fluorescent module, the laser module is used to emit laser light, and the fluorescent module is used to emit fluorescent light;

An optical expansion component, which is used to expand the optical expansion of the laser light so that the difference between the optical expansion of the expanded laser light and the optical expansion of the fluorescent light is less than or equal to a preset threshold ;as well as

The light combining component is used for combining the fluorescent light and the laser light expanded by the optical expansion component and emitting it.
The light source device according to claim 1, wherein the optical expansion assembly comprises:

A homogenization component, the homogenization component is used to homogenize the laser light; and

Lens, the lens is used to converge and emit the homogenized laser light.
3. The light source device according to claim 2, wherein the optical expansion assembly further comprises a reflector, the reflector is used to reflect the converged laser light to the light combining assembly.
The light source device according to claim 1, wherein the light source device further comprises a polarizing device, the polarizing device receives the light emitted by the light combining component and converts it into a polarization state for output.
The light source device according to any one of claims 1 to 4, wherein the light combining component comprises a first surface and a second surface that are away from each other, and the fluorescent light is incident on the second surface and passes through The light combining component emits through the first surface, and the optically expanded laser light is incident on the first surface.
The light source device according to claim 5, wherein the optical expansion amount of the fluorescent light on the first surface is the same as the optical expansion amount of the laser light on the first surface.
The light source device according to claim 5, wherein the light source device further comprises a first lens group, the first lens group is disposed between the light combining component and the light homogenizing component, and is located at the Between the light combining component and the laser module.
The light source device according to claim 5, wherein the first surface is covered with a reflective film, the reflective film includes a first area and a second area, the second area surrounds the first area, and The second area transmits light of higher than a predetermined wavelength and reflects light of lower than the predetermined wavelength, the first area reflects light of all wavelengths, and the optically expanded laser light is incident on the first In a region and the second region, the fluorescent light is incident on the second surface and transmitted through the second region.
The light source device according to claim 5, wherein the fluorescent module comprises a wavelength conversion device and a second laser module, and the second laser module emits second laser light in the S polarization state, and the wavelength The conversion device is used for converting the second laser light emitted by the second laser module into fluorescent light.
The light source device according to claim 9, wherein the fluorescent module further comprises a guiding device, the guiding device is used to guide the second laser light to the wavelength conversion device, and the fluorescent light The light is guided out.
The light source device according to claim 9, wherein the wavelength conversion device converts at least a part of the laser light that has not been converted into fluorescence into laser light of the P polarization state, and the fluorescence and the P polarization state are The laser beam is combined by the guiding device and then exits.
The light source device according to claim 11, wherein the first surface is covered with a reflective film, the reflective film includes a first area and a second area, the second area surrounds the first area, and The first area transmits light with the P polarization state and reflects light with the S polarization state, and the second area transmits light with the P polarization state and reflects light with the S polarization state of less than a preset wavelength.
A projection device, wherein the projection device is installed with the light source device according to any one of claims 1-12.