WO2022057675A1

WO2022057675A1 - Light source device and laser projection system

Info

Publication number: WO2022057675A1
Application number: PCT/CN2021/116807
Authority: WO
Inventors: 张翠萍; 蒲栋; 陈彦哲; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-09-17
Filing date: 2021-09-07
Publication date: 2022-03-24
Also published as: CN114200754A

Abstract

A light source device (1) and a laser projection system (60). The light source device (1) comprises: a first light source (10) for emitting excitation light; a first polarization controller (11) for controlling a polarization state of the excitation light to emit excitation light of a first polarization state or a second polarization state; a first homogenizing apparatus (12) for performing homogenizing processing on the excitation light of the first polarization state or the second polarization state; a first light splitting/combining member (40) for reflecting the excitation light of the first polarization state or transmitting the excitation light of the second polarization state; a first wavelength conversion device (21) for receiving the excitation light of the first polarization state and emitting first light; and a second wavelength conversion device (31) for receiving the excitation light of the second polarization state and emitting second light, wherein the first light splitting/combining member (40) reflects the second light or transmits the first light. The first wavelength conversion device (21) and the second wavelength conversion device (31) are excited by means of the single first polarization controller (11), so that the working efficiency can be improved and the costs can be lowered, and moreover, the brightness of the first light or the second light is effectively improved.

Description

Light source device and laser projection system

technical field

The present application relates to the field of laser modulation, and in particular, to a light source device and a laser projection system.

Background technique

Micro-projection products usually adopt the scheme of single-chip spatial light modulator, and use the three-primary color display of the time integration principle to form a full-color display. The light source scheme of RGB three-color LED is widely used in micro-projection, that is, full-color display is performed by using the principle of RGB switching repeatedly in sequence. However, because the LED etendue per unit area is large, in the projection system, due to the limitation of the etendue, the brightness of the LED micro-projection is limited, and it can usually only be used in low-brightness displays.

Laser fluorescent light source, which can take advantage of its small etendue to achieve higher brightness display, has also been used in micro-projection systems in recent years. The most commonly used method is to use a blue laser to excite a segmented fluorescent color wheel, generate RGB illumination light in turn, and achieve full color through time integration. However, in this solution, the precision of the rotation speed of the color wheel motor is extremely high, which leads to the high cost of the color wheel. And due to the size limitation of the color wheel motor, it is difficult to further reduce the size of the light source part, and it is difficult to apply it in micro-projection products that require extremely high size and portability.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems in the prior art, a technical solution adopted in this application is to provide a light source device, the light source device comprising:

a first light source for emitting excitation light;

a first polarization regulator, arranged on the optical path of the excitation light, for regulating the polarization state of the excitation light;

The first light homogenizer is arranged on the optical path of the outgoing light modulated by the first polarization regulator, and is used for homogenizing the excitation light of the first polarization state or the excitation light of the second polarization state;

The first light splitting and combining element is arranged on the light path of the outgoing light of the first homogenizer, and is used for reflecting the excitation light of the first polarization state or transmitting the excitation light of the second polarization state;

The first wavelength conversion device is arranged on the optical path of the excitation light of the first polarization state reflected by the first light splitting and combining element, receives the excitation light of the first polarization state, and converts the wavelength to emit the first light;

The second wavelength conversion device is arranged on the optical path of the excitation light of the second polarization state transmitted by the first light splitting and combining element, receives the excitation light of the second polarization state, and converts the wavelength to emit the second light;

The first light splitting and combining element receives the first light and the second light emitted by the first wavelength conversion device and the second wavelength conversion device, and transmits the first light and reflects the second light.

Optionally, the first wavelength conversion device is a first phosphor powder, and the light source device further includes a first lens assembly, and the first lens assembly is arranged on the optical path of the excitation light of the first polarization state reflected by the first light splitting and combining member, The excitation light of the first polarization state is focused on the first phosphor, and the first light emitted by the first phosphor is collected.

Optionally, the second wavelength conversion device is a second phosphor powder, and the light source device further includes a second lens assembly, and the second lens assembly is arranged on the optical path of the excitation light of the second polarization state transmitted by the first light splitting and combining member, The excitation light of the second polarization state is focused on the second phosphor, and the second light emitted by the second phosphor is collected.

Optionally, there is a time interval between the excitation light of the first polarization state and the excitation light of the second polarization state emitted by the first polarization regulator;

The light source device further includes:

The second light homogenizer is arranged on the optical path of the outgoing light of the first light splitting and light combining element, and is used for homogenizing the first light and the second light;

Lasers for emitting blue laser light at time intervals;

The first scattering device is arranged on the optical path of the blue laser, and is used for scattering the blue laser to obtain blue light;

The third homogenizer is arranged on the light path of the blue light, and is used for homogenizing the blue light;

The second light splitting and light combining element is arranged on the light path of the outgoing light of the second light homogenizer and the third light homogenizer, and is used to combine the blue light, the first light and the second light after the light homogenization treatment, so as to Outgoing synthetic light.

Optionally, there is a time interval between the excitation light of the first polarization regulator exiting the first polarization state and the excitation light of the second polarization state;

The light source fixture further includes:

a second light source for emitting blue light within a time interval;

Optionally, the light source device further includes:

The second polarization regulator is arranged on the optical path of the excitation light, and is used for regulating the polarization state of the excitation light, so as to emit the excitation light of the third polarization state or the excitation light of the fourth polarization state;

a polarization selector, arranged on the optical path of the outgoing light modulated by the second polarization regulator, for reflecting the excitation light of the third polarization state or transmitting the excitation light of the fourth polarization state;

The excitation light of the fourth polarization state is used as the excitation light source of the first wavelength conversion device and the second wavelength conversion device, and the excitation light of the fourth polarization state is regulated by the first polarization regulator to emit the excitation light of the first polarization state or excitation light of the second polarization state.

Optionally, the light source device further includes:

a reflector, arranged on the optical path of the excitation light of the third polarization state reflected by the polarization selector, and used to change the propagation path of the excitation light of the third polarization state;

The scattering device is arranged on the optical path of the outgoing light of the reflector, and is used for scattering the excitation light of the third polarization state to obtain the third light;

The second light splitting and combining element is arranged on the optical path of the third light, and is used for combining the first light, the second light and the third light after the homogenization treatment, so as to emit the combined light.

Optionally, the first phosphor powder and the second phosphor powder include at least one of a fixed phosphor powder and a non-segmented rotating phosphor wheel.

In order to solve the above-mentioned technical problems in the prior art, another technical solution adopted in the present application is to provide a laser projection system, which includes the above-mentioned light source device, power supply, main board and projection screen, and the power supply is connected to the light source device and the projection screen. The main board is connected to the light source device, and the projection screen is used for receiving the polarized light modulated by the light source device.

Optionally, the light-emitting device of the light source device includes phosphor powder and a light-emitting light source, and the phosphor powder includes at least one of a fixed phosphor powder and a non-segmented rotating phosphor wheel.

The beneficial effects of the present application are: different from the prior art, the present application adds a first polarization regulator for regulating the polarization state of the excitation light, and the first polarization regulator converts the excitation light emitted by the first light source into the excitation light of the first polarization state light, and then excite the first wavelength conversion device to emit the first light, or convert the excitation light emitted by the first light source into excitation light of the second polarization state, and then excite the second wavelength conversion device to emit the second light, through a single first polarization The regulator excites the first wavelength conversion device and the second wavelength conversion device, which can improve work efficiency and reduce cost. At the same time, the first polarization regulator only emits excitation light of one polarization state at a time, so that the first wavelength conversion device receives all the excitation lights of the first polarization state emitted by the first polarization regulator, or the second wavelength conversion device receives the first polarization state. All the excitation light of the second polarization state emitted by the polarization regulator, thereby realizing the full-load operation of the first wavelength conversion device or the second wavelength conversion device, and effectively improving the first light or the second wavelength conversion device emitted by the first wavelength conversion device. The brightness of the second light emitted.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

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

2 is a schematic structural diagram of a second embodiment of a light source device of the present application;

Fig. 3 is the corresponding relation diagram of the first polarization regulator of the present application and the first light source power switch;

4 is a schematic structural diagram of a third embodiment of a light source device of the present application;

5 is a schematic structural diagram of a fourth embodiment of a light source device of the present application;

FIG. 6 is a schematic structural diagram of an embodiment of the laser projection system of the present application.

detailed description

In order for those skilled in the art to better understand the technical solutions of the present application, the light source device and the laser projection system provided by the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

Please refer to FIG. 1 , which is a schematic structural diagram of a first embodiment of a light source device of the present application. The light source device 1 includes a first light source 10 , a first polarization regulator 11 , a first light homogenizer 12 , a first wavelength conversion device 21 , a second wavelength conversion device 31 and a first light splitting and combining element 40 .

The first light source 10 is used for emitting excitation light, and the excitation light is used as the excitation light source of the first wavelength conversion device 21 and the second wavelength conversion device 31 . Optionally, the first light source 10 may be a laser or LED light source. Specifically, the laser may be a blue laser or a red laser, etc., and the LED light source may be a blue LED light source or a UV-LED light source, or the like.

The first polarization regulator 11 is disposed on the optical path of the excitation light, and is used for regulating the polarization state of the excitation light, so as to emit the excitation light of the first polarization state or the excitation light of the second polarization state. The first polarization regulator 11 in this embodiment is an electronically controlled liquid crystal panel. By changing the voltage of the electronically controlled liquid crystal panel, the deflection state of the liquid crystal is changed, so that the excitation light passes through the electronically controlled liquid crystal panel in different polarization states. Different from the common liquid crystal display panel, the first polarization regulator 11 in this embodiment only needs to perform overall deflection regulation on the liquid crystal, and does not require independent pixel regulation. Therefore, the aperture ratio of the electronically controlled liquid crystal panel is high, and the transmittance is high. At the same time, since the polarizer and the analyzer are not required, there is no problem of heat dissipation, and the reliability of the electronically controlled liquid crystal panel can be improved.

Optionally, the excitation light of the first polarization state may be blue laser light with a preset polarization direction, blue LED light, UV light or excitation light of other colors, etc.; the excitation light of the second polarization state may be the same as that of the first polarization state. The excitation light of the polarization state is orthogonally polarized blue laser light, blue LED light, UV light or other color excitation light, and so on.

"Polarization" is a universal property of all kinds of lasers, which is determined by the principle by which the laser is formed. The laser beam is formed by the stimulated radiation of particles of the luminescent medium within the laser. Stimulated radiation has distinct characteristics: when a foreign photon irradiates a particle of the upper energy level of the laser, the particle radiates a photon and transitions to the lower energy level, and the photon generated by the stimulated radiation has the same phase, the same propagation direction and the same polarization state. When stimulated radiation in a laser forms a photon stream, all photons in a mode photon stream have the same phase, the same direction of propagation, and the same polarization state. This means that a laser longitudinal mode (frequency) must be polarized. Meanwhile, the polarization states of the adjacent longitudinal modes of the laser are either parallel or vertical. A laser "orthogonally polarized" means that two adjacent frequencies of the laser have mutually perpendicular polarization states. A pair of left and right circularly polarized light should also be regarded as orthogonally polarized light.

Optionally, in other embodiments, the first polarization regulator 11 may be other devices whose polarization state can be adjusted.

The first homogenizer 12 is arranged on the optical path of the excitation light of the first polarization state, or is arranged on the optical path of the excitation light of the second polarization state, and is used to excite the excitation light of the first polarization state or the excitation light of the second polarization state. The light is homogenized. Optionally, the first light homogenizer 12 in this embodiment may be a fly-eye lens or a square rod. In this embodiment, according to the first light homogenizer 12 , a higher utilization rate of light energy and uniform illumination of a large area can be obtained, and the uniformity of the excitation light emitted by the first light source 10 can be improved.

The first light splitting and combining element 40 is disposed on the light path of the outgoing light of the first light homogenizer 12, and is used for reflecting the excitation light of the first polarization state or transmitting the excitation light of the second polarization state. The first light splitting and combining element 40 is provided with a polarizing light splitting film, which reflects the excitation light in a specific polarization direction and transmits the excitation light orthogonally polarized with the excitation light in the specific polarization direction, that is, the excitation of the first polarization state is reflected. light, the excitation light of the second polarization state is transmitted.

The first wavelength conversion device 21 is disposed on the optical path of the excitation light of the first polarization state emitted by the first light splitting and combining element 40 , receives the excitation light of the first polarization state and performs wavelength conversion to emit the first light.

The first wavelength conversion device 21 is a first phosphor. Optionally, the first phosphor can be a fixed phosphor or a non-segmented rotating phosphor wheel, specifically a red phosphor or a pure red phosphor wheel, that is, the first light emitted by the first wavelength conversion device 21 is: red light. Different from the segmented fluorescent wheel, the first fluorescent powder has low requirements on the motor precision, avoiding the limitation in size and cost of the motor of the traditional segmented color wheel. Secondly, the first phosphor of this embodiment does not require the synchronous control of the motor and other components, which reduces the requirement for the accuracy of the motor speed, avoids the motor from working at high speed, reduces system noise, improves the heat dissipation performance of the phosphor, and reduces production costs.

The second wavelength conversion device 31 is disposed on the optical path of the excitation light of the second polarization state transmitted by the first light splitting and combining element 40 , receives the excitation light of the second polarization state and performs wavelength conversion to emit the second light.

Wherein, the second wavelength conversion device 31 is a second phosphor. Optionally, the second phosphor can be a fixed phosphor or a non-segmented rotating phosphor wheel, specifically a green phosphor or a pure green phosphor wheel, that is, the second light emitted by the second wavelength conversion device 31 is: green light. Different from the segmented fluorescent wheel, the second fluorescent powder has low requirements on the motor precision, avoiding the limitation in size and cost of the motor of the traditional segmented color wheel. Secondly, the second phosphor of this embodiment does not require the synchronous control of the motor and other components, which reduces the requirement for the accuracy of the motor speed, avoids the motor from working at high speed, reduces system noise, improves the heat dissipation performance of the phosphor, and reduces production costs.

Optionally, in other embodiments, the first phosphor powder may be a green phosphor powder or a pure green phosphor powder wheel, and the second phosphor powder may be a red phosphor powder or a pure red phosphor powder wheel, that is, the output of the first wavelength conversion device 21 . The first light may be green light, and the second light emitted by the second wavelength conversion device 31 may be red light.

The first light splitting and combining element 40 receives the first light and the second light emitted by the first wavelength conversion device 21 and the second wavelength conversion device 31, and transmits the first light and reflects the second light.

Referring further to FIG. 2 , FIG. 2 is a schematic structural diagram of a second embodiment of the light source device of the present application. As shown in FIG. 2 , the light source device 1 further includes a first lens group 22 and a second lens group 32 . The first lens assembly 22 is disposed on the optical path of the excitation light of the first polarization state reflected by the first light splitting and combining element 40 , and the second lens assembly 32 is disposed on the second polarization that is transmitted by the first light splitting and combining element 40 . on the optical path of the excitation light of the state.

The first lens group 22 further includes a first lens 221 and a second lens 222. Both the first lens 221 and the second lens 222 are convex lenses. The excitation light is focused on the first phosphor, so that the first phosphor is excited to emit the first light; at the same time, the first lens group 22 is used to collect the scattered first light and condense the first light into the first split light Piece 40. Optionally, in other embodiments, the first lens group 22 may include three or more lenses, such as three, four, five, and the like.

The second lens group 32 further includes a third lens 321 and a fourth lens 322. Both the third lens 321 and the fourth lens 322 are convex lenses. In this embodiment, the second lens group 32 is provided with a biconvex lens to convert the second polarization state The excitation light converges to the second phosphor, so that the second phosphor is excited to emit the second light; at the same time, the second lens group 32 is used to collect the second scattered light, and condense the second light to the first photosynthesis Optical element 40 . Optionally, in other embodiments, the second lens group 32 may include three or more lenses, such as three, four, five, and the like.

As shown in FIG. 2 , the light source device 1 of this embodiment further includes a laser 52 , a first scattering device 53 and a third light homogenizer 51 . The laser 52 is used to emit blue laser light, that is, the laser 52 is a blue laser. The first scattering device 53 is disposed on the optical path of the blue laser light, and is used for scattering the blue laser light to obtain blue light. Alternatively, the first scattering device 53 may be a scattering film. The third light homogenizer 51 is disposed on the light path of the blue light, and is used for performing homogenization processing on the blue light.

Referring to FIG. 3 in conjunction with FIG. 2 , FIG. 3 is a diagram showing the corresponding relationship between the first polarization regulator and the first light source power switch of the present application. As shown in FIG. 3 , the first polarization modifier 11 is provided with a first state and a second state. When the operating voltage of the first polarization regulator 11 is the first voltage, the first polarization regulator 11 is in the first state; when the operating voltage of the first polarization regulator 11 is the second voltage, the first polarization regulator 11 is in the first state at this time The controller 11 is in the second state. Since the first polarization regulator 11 is an electronically controlled liquid crystal panel, the liquid crystal is deflected when the voltage is changed, and it takes a period of time for the liquid crystal to be deflected from the first state to the second state. Therefore, the first polarization regulator 11 is in the first There is a time interval for switching between the state and the second state, that is, there is a time interval between the excitation light of the first polarization state and the excitation light of the second polarization state emitted by the first polarization regulator 11 .

Due to the problem of rising and falling edges in the deflection of the liquid crystal, the first polarization regulator 11 cannot instantaneously change the polarization state of the excitation light emitted by the first light source 10. Therefore, during the switching between the first state and the second state, The first light source 10 is turned off, and when the liquid crystal deflection of the first polarization regulator 11 is stabilized, the first light source 10 is turned on again. In this embodiment, the first light source 10 is turned off during the liquid crystal deflection process, and the first light source 10 is turned on after the liquid crystal deflection of the first polarization regulator 11 is stabilized, which can solve the problem that the first polarization regulator 11 cannot emit light to the first light source 10 . The problem of color crosstalk caused by the instantaneous change of the polarization state of the excitation light.

The optical three primary colors include red, green and blue. By mixing these three primary colors in different proportions and strengths, various color changes in nature can be produced. In order to realize the image display of the projection system, the present application provides a first wavelength conversion device 21 , a second wavelength conversion device 31 and a laser 52 to emit red light, green light and blue light. Wherein, the specific working process of the light source device 1 of the present application is as follows:

When the first polarization regulator 11 receives the first voltage, that is, when the first polarization regulator 11 is in the first state, the first wavelength conversion device 21 receives the excitation light of the first polarization state output by the first polarization regulator 11 and performs The wavelength is converted to emit red light; at this time, the laser 52 is turned off.

When the first polarization regulator 11 receives the second voltage, the liquid crystal contained in the first polarization regulator 11 is converted from the first polarization state to the second polarization state, that is, the first polarization regulator 11 is in one of the first state and the second state During the time interval, the first light source 10 is turned off and the laser 52 is turned on, and the blue laser light output by the laser 52 emits blue light through the first scattering device 53 .

When the deflection of the liquid crystal included in the first polarization regulator 11 is completed, that is, when the first polarization regulator 11 is in the second state, the laser 52 is turned off and the first light source 10 is turned on, and the second wavelength conversion device 31 receives the first polarization regulator 11 The output excitation light of the second polarization state is subjected to wavelength conversion to emit green light.

In this embodiment, the laser 52 and the first scattering device 53 are used between the time when the first polarization regulator 11 excites the first wavelength conversion device 21 to output red light and the first polarization regulator 11 excites the second wavelength conversion device 31 to output green light. The blue light is emitted, and the image display of the projection system is realized by mixing the three primary colors. At the same time, the supplementary blue light is mixed between the red light and the green light to provide the adjustment time for the first polarization regulator 11 to prevent the first polarization regulator 11 from being unable to The color crosstalk caused by the instantaneous change of the polarization state of the excitation light emitted from the first light source 10 .

As shown in FIG. 2 , the light source device 1 of this embodiment further includes a second light homogenizer 41 and a second light splitting and light combining element 42 .

The second light homogenizer 41 is arranged on the optical path of the outgoing light of the first light splitting and combining element 40, and is used for performing homogenization processing on the first light and the second light.

The second light splitting and combining element 42 is disposed on the optical path of the emitted light from the second light homogenizer 41 and the third light homogenizer 51, and is used to combine the blue light, the first light and the second light after the light homogenization treatment. , to emit the combined light to the next-level projection system.

The second light splitting and combining element 42 in this embodiment is a dichroic plate, which is selected according to wavelength, reflects short wavelength light and transmits long wavelength light, that is, reflects blue light and transmits red light and green light. The blue light, the red light and the green light are combined and processed by the second light splitting and combining element 42 to form combined light, which is output to the next-level projection system to realize full-color display of three primary colors.

Referring further to FIG. 4 , FIG. 4 is a schematic structural diagram of a third embodiment of the light source device of the present application. Different from the second embodiment, the light source device 1 of this embodiment is provided with a second light source 50 for emitting blue light. The second light source 50 is a blue LED. In this embodiment, the production cost can be reduced by setting the second light source 50 to replace the laser 52 and the first scattering device 53 .

The specific working principle of this embodiment is similar to that of the above-mentioned embodiment, and details are not described herein again.

Referring further to FIG. 5 , FIG. 5 is a schematic structural diagram of a fourth embodiment of a light source device of the present application. Different from the second embodiment, the light source device 1 of this embodiment further includes a second polarization regulator 13 , a polarization selector 14 , a reflection mirror 15 , and a second scattering device 16 .

The second polarization regulator 13 is disposed on the optical path of the excitation light, and is used for regulating the polarization state of the excitation light, so as to emit the excitation light of the third polarization state or the excitation light of the fourth polarization state. Optionally, the second polarization regulator 13 is an electrically controlled liquid crystal panel. By changing the voltage of the electrically controlled liquid crystal panel, the deflection state of the liquid crystal is changed, so that the excitation light passes through the electrically controlled liquid crystal panel in different polarization states. Optionally, in other embodiments, the second polarization regulator 13 may be other devices that can control the polarization state.

The polarization selector 14 is arranged on the optical path of the excitation light of the third polarization state, or is arranged on the optical path of the excitation light of the fourth polarization state, and is used to reflect the excitation light of the third polarization state or transmit the excitation light of the fourth polarization state .

The excitation light of the fourth polarization state is used as the excitation light source of the first wavelength conversion device 21 and the second wavelength conversion device 31 , and the excitation light of the fourth polarization state is regulated by the first polarization regulator 11 to emit light of the first polarization state. The excitation light or the excitation light of the second polarization state further excites the first wavelength conversion device 21 or the second wavelength conversion device 31 to emit red light or green light.

It should be noted that, in one embodiment, the excitation light of the third polarization state is the same as the excitation light of the first polarization state, and the excitation light of the fourth polarization state is the same as the excitation light of the second polarization state, that is, the third polarization state and the excitation light of the second polarization state are the same. The polarization directions of the first polarization state are the same, and the polarization directions of the fourth polarization state and the second polarization state are the same; or the excitation light of the third polarization state and the excitation light of the second polarization state are the same, and the excitation light of the fourth polarization state and the third polarization state are the same. The excitation light of one polarization state is the same, that is, the polarization directions of the third polarization state and the second polarization state are the same, and the polarization directions of the fourth polarization state and the first polarization state are the same.

The mirror 15 is disposed on the optical path of the excitation light of the third polarization state reflected by the polarization selector 14, and is used to change the propagation path of the excitation light of the third polarization state.

The second scattering device 16 is disposed on the optical path of the outgoing light of the reflecting mirror 15, and is used for scattering the excitation light of the third polarization state to obtain the third light. Optionally, a homogenizing device may be arranged on the optical path of the outgoing light of the second scattering device 16 to perform homogenizing treatment on the third light.

In order to realize full-color display of three primary colors, the first light source 10 uses a blue excitation light source, so that the third light is blue light. The blue light emitted from the second scattering device 16 is transmitted to the second photo-splitting and combining member 42 to form a combined light after being processed with the first light and the second photo-combining member, that is, blue light, red light and green light are passed through the second photo-splitting and combining member 42 After the combined light processing, the combined light is formed and output to the next-level projection system to realize the full-color display of three primary colors.

The present application further provides a laser projection system 60 , please refer to FIG. 6 , which is a schematic structural diagram of an embodiment of the laser projection system of the present application. As shown in FIG. 6 , the laser projection system 60 includes a light source device 61 , a main board 62 , a projection screen 63 and a power supply 64 . The light source device 61 is the light source device 1 disclosed in the above embodiments, and details are not described herein again.

The power supply 64 is connected to the light source device 61 and the main board 62 , and is used for providing the light source device 61 and the main board 62 with a working voltage.

The main board 62 is connected to the light source device 61 for controlling the working state of the light source device 61 . Specifically, the main board 62 is used to control the working voltage of the light source device 61 , thereby controlling the light source device 61 to output different polarized lights.

The projection screen 63 is used to receive the polarized light modulated and output by the light source device 61, and perform imaging according to different polarized lights.

The light source device 1 of the present application adds a first polarization regulator 11 that regulates the polarization state of the excitation light, and the first polarization regulator 11 converts the excitation light emitted by the first light source 10 into excitation light of the first polarization state, and then excites the first wavelength. The conversion device 21 emits the first light, or converts the excitation light emitted by the first light source 10 into excitation light of the second polarization state, and then excites the second wavelength conversion device 31 to emit the second light, which is paired by a single first polarization regulator 11 . The first wavelength conversion device 21 and the second wavelength conversion device 31 perform excitation, which can improve work efficiency and reduce costs. At the same time, the first polarization regulator 11 only emits excitation light of one polarization state at a time, so that the first wavelength conversion device 21 receives all the excitation lights of the first polarization state emitted by the first polarization regulator 11, or the second wavelength conversion device 31 receives all the excitation light of the second polarization state emitted by the first polarization regulator 11, thereby realizing the full-load operation of the first wavelength conversion device 21 or the second wavelength conversion device 31, and effectively improving the first wavelength conversion device 21. The brightness of a light or the second light emitted by the second wavelength conversion device 31 . In addition, the present application uses a fixed phosphor powder or a non-segmented rotating phosphor wheel as the first phosphor powder and the second phosphor powder, which reduces the precision requirements for the motor and avoids the size and cost of the motor of the traditional segmented color wheel. Limit and avoid high-speed motors at the same time, reduce system noise, improve the heat dissipation performance of phosphors, and reduce production costs.

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present application.

Claims

A light source device, characterized in that it includes:

a first light source for emitting excitation light;

a first polarization regulator, arranged on the optical path of the excitation light, for regulating the polarization state of the excitation light;

a first light homogenizer, arranged on the optical path of the outgoing light modulated by the first polarization regulator, and used for homogenizing the excitation light of the first polarization state or the excitation light of the second polarization state;

The first light splitting and combining element is arranged on the optical path of the outgoing light of the first homogenizer, and is used for reflecting the excitation light of the first polarization state or transmitting the excitation light of the second polarization state;

a first wavelength conversion device, arranged on the optical path of the excitation light of the first polarization state reflected by the first light splitting and combining member, receiving the excitation light of the first polarization state and converting the wavelength to emit the first light;

a second wavelength conversion device, arranged on the optical path of the excitation light of the second polarization state transmitted by the first light splitting and combining element, receiving the excitation light of the second polarization state and converting the wavelength to emit the second light;

The first light splitting and combining element receives the first light and the second light emitted by the first wavelength conversion device and the second wavelength conversion device, and transmits the first light and reflects the second light. Two light.
The light source device according to claim 1, wherein the first wavelength conversion device is a first phosphor powder, the light source device further comprises a first lens component, and the first lens component is disposed on the On the optical path of the excitation light of the first polarization state reflected by a light splitting element, the excitation light of the first polarization state is used to focus the excitation light of the first polarization state on the first phosphor powder, and to collect the output of the first phosphor powder of the first light.
The light source device according to claim 2, wherein the second wavelength conversion device is a second phosphor powder, the light source device further comprises a second lens component, the second lens component is disposed on the The optical path of the excitation light of the second polarization state transmitted by a light splitting element is used for focusing the excitation light of the second polarization state on the second phosphor, and for collecting the second phosphor to exit of the second light.
The light source device according to claim 3, wherein:

There is a time interval between the excitation light of the first polarization state and the excitation light of the second polarization state emitted by the first polarization regulator;

The light source device further includes:

a second light homogenizer, arranged on the optical path of the outgoing light of the first light splitting and light combining element, and used for performing homogenization processing on the first light and the second light;

a laser for emitting blue laser light within the time interval;

a first scattering device, disposed on the optical path of the blue laser light, and used for scattering the blue laser light to obtain blue light;

a third light homogenizer, arranged on the optical path of the blue light, and used for performing homogenization processing on the blue light;

The second light splitting and combining element is arranged on the optical path of the outgoing light of the second light homogenizer and the third light homogenizer, and is used for mixing the blue light, the first light and the all light after homogenization processing. The second light is combined with light to emit combined light.
The light source device according to claim 3, wherein:

There is a time interval between the excitation light of the first polarization state and the excitation light of the second polarization state emitted by the first polarization regulator;

The light source device further includes:

a second light homogenizer, arranged on the optical path of the outgoing light of the first light splitting and light combining element, and used for performing homogenization processing on the first light and the second light;

a second light source for emitting blue light within the time interval;

a third light homogenizer, arranged on the optical path of the blue light, and used for performing homogenization processing on the blue light;

The second light splitting and combining element is arranged on the optical path of the outgoing light of the second light homogenizer and the third light homogenizer, and is used for mixing the blue light, the first light and the all light after homogenization processing. The second light is combined with light to emit combined light.
The light source device according to claim 3, wherein the light source device further comprises:

The second polarization regulator is arranged on the optical path of the excitation light, and is used for regulating the polarization state of the excitation light, so as to emit the excitation light of the third polarization state or the excitation light of the fourth polarization state;

a polarization selector, arranged on the optical path of the outgoing light modulated by the second polarization regulator, for reflecting the excitation light of the third polarization state or transmitting the excitation light of the fourth polarization state;

Wherein, the excitation light of the fourth polarization state is used as the excitation light source of the first wavelength conversion device and the second wavelength conversion device, and the excitation light of the fourth polarization state is regulated by the first polarization regulator, to emit the excitation light of the first polarization state or the excitation light of the second polarization state.
The light source device according to claim 6, wherein the light source device further comprises:

a second light homogenizer, arranged on the optical path of the outgoing light of the first light splitting and light combining element, and used for performing homogenization processing on the first light and the second light;

a reflector, arranged on the optical path of the excitation light of the third polarization state reflected by the polarization selector, for changing the propagation path of the excitation light of the third polarization state;

The second scattering device is arranged on the optical path of the outgoing light of the reflecting mirror, and is used for scattering the excitation light of the third polarization state to obtain the third light;

The second light splitting and combining element is arranged on the optical path of the third light, and is used to perform light combining processing on the first light, the second light and the third light after the uniform light treatment, so as to emit light Synthetic light.
The light source device according to claim 1, wherein the first phosphor powder and the second phosphor powder comprise at least one of a fixed phosphor powder and a non-segmented rotating phosphor wheel.
A laser projection system, characterized in that the laser projection system comprises the light source device according to any one of claims 1-8, a power supply, a main board and a projection screen, and the power supply is connected to the light source device and the main board, The main board is connected to the light source device, and the projection screen is used for receiving polarized light modulated by the light source device.
The laser projection system according to claim 9, wherein the light-emitting device of the light source device comprises a phosphor powder and a light-emitting light source, and the phosphor powder at least comprises a fixed phosphor powder and a non-segment rotating phosphor wheel. A sort of.