WO2021143438A1

WO2021143438A1 - Wavelength conversion device, light source device, and projection system

Info

Publication number: WO2021143438A1
Application number: PCT/CN2020/137108
Authority: WO
Inventors: 郭祖强; 杨炳柯; 王则钦; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-01-16
Filing date: 2020-12-17
Publication date: 2021-07-22
Also published as: CN113126408A

Abstract

Provided is a light source device (10a, 10b, 10c, 10d, 10e), comprising a light source (100), a wavelength conversion device (500), and a dichroic sheet (300). The light source (100) is used for emitting exciting light, and the wavelength conversion device (500) comprises a fluorescent color segment (512) for converting the incident exciting light into excited light. The dichroic sheet (300) is arranged between the light source (100) and the wavelength conversion device (500), is used for guiding the exciting light emitted by the light source (100) to the wavelength conversion device (500) and for receiving the excited light that is emitted by the wavelength conversion device (500) and exciting light that is not converted, and is also used for guiding the excited light to a subsequent light path and guiding the exciting light that is not converted to exit from other paths. The light source device (10a, 10b, 10c, 10d, 10e) can achieve high brightness and good color output without using a color correction sheet. In addition, a wavelength conversion device (500) and a projection system (1) are further provided.

Description

Wavelength conversion device, light source device and projection system

Technical field

The present invention relates to the field of projection technology, in particular to a wavelength conversion device, a light source device and a projection system.

Background technique

In recent years, with the promotion of concepts such as home theaters and screenless TVs, the laser projector market has developed rapidly. In the projector, in order to achieve a more standard color gamut, a color correction film is usually used to filter out certain wavelengths of the R, G, or B primary color light spectrum, so that the color of the primary color light is better. However, correspondingly, the use of the color correction film will greatly increase the manufacturing cost of the product, and the absence of the color correction film will reduce the cost, but it will also make the light source device unable to meet the requirements of brightness and color.

Summary of the invention

The purpose of this application is to provide a wavelength conversion device, a light source device, and a projection system to improve the above-mentioned problems. This application achieves the above-mentioned purpose through the following technical solutions.

In a first aspect, the present application provides a light source device, which includes a light source, a wavelength conversion device, and a dichroic plate. The light source is used to emit excitation light. The wavelength conversion device includes a fluorescent color segment for converting the incident excitation light into a received laser light. The dichroic film is arranged between the light source and the wavelength conversion device, and is used to guide the excitation light emitted by the light source to the wavelength conversion device, and receive the laser light and the unconverted excitation light emitted by the wavelength conversion device; the dichroic film is also used To guide the received laser light to the subsequent optical path, and guide the unconverted excitation light to exit from other paths.

In one embodiment, the wavelength conversion device further includes a reflection section for scattering and reflecting the incident excitation light before exiting, wherein the incident light path of the excitation light entering the reflection section is different from the exit light path of the excitation light after scattering and reflection.的光 Path;

The light source device also includes a reflector. The reflector is located in the light path of the scattered and reflected excitation light after passing through the dichroic film, and is used to reflect the excitation light back to the dichroic film so that it is guided by the dichroic film and received The laser is emitted along the same optical path.

In one embodiment, an offset film layer is embedded in the reflection section, and the offset film layer is used to offset the exit light path of the excitation light emitted from the reflection section, so that the offset excitation light and the fluorescent color section are emitted. The beams of the laser light do not coincide.

In one embodiment, the offset film layer includes a transmissive film layer and a reflective film layer, the transmissive film layer and the reflective film layer are separated by a set distance, and the excitation light is transmitted from the transmissive film layer to the reflective film layer. After the layer is reflected, it is incident again to the transmissive film layer and exits from the transmissive film layer.

In one embodiment, the light source device further includes a reflection system, which receives the excitation light reflected by the reflector, and guides the excitation light to the dichroic plate, so that the excitation light is guided by the dichroic plate to the laser beam. Eject along the same light path.

In one embodiment, the light source device further includes a beam expander, and the beam expander is located in the optical path from the reflector to the dichroic plate.

In an embodiment, the light source device further includes a compensation light source, and the compensation light emitted by the compensation light source is combined with the received laser light and then emitted.

In one embodiment, the light source device includes a compensation light source, and the compensation light emitted by the compensation light source passes through the dichroic plate and combines with the received laser light.

In one embodiment, the dichroic plate includes adjacent first and second regions, and the second region can transmit the excitation light and reflect the received laser light.

In one embodiment, the second area is arranged around the first area.

In one embodiment, the light source device further includes a light homogenization device, which is used to homogenize the excitation light emitted by the light source.

In an embodiment, the light source device further includes a lens group, which is located on the optical path between the dichroic plate and the wavelength conversion device.

In one embodiment, the light source device further includes a fly-eye lens group, and the fly-eye lens group is located on the optical path of the received laser light and the excited light emitted through the dichroic plate.

In the second aspect, the present application provides a projection system, which is installed with the light source device as described in any of the above items.

In a third aspect, the present application also provides a wavelength conversion device. The wavelength conversion device includes a reflective section and at least one fluorescent color section, wherein the fluorescent color section is used to convert incident excitation light into a received laser light, and the reflective section is used to convert The incident excitation light is reflected and then exits; when the incident light path incident on the reflective section and the reflected exit light path are different light paths, the reflective section is also used to offset the exit light path of the excitation light emitted from the reflective section.

In one embodiment, the reflection section includes a transmission film layer, a transmission medium film layer, and a reflection film layer sequentially arranged along the direction of the incident light path, wherein the transmission medium film layer has a set thickness.

In one embodiment, the propagation medium film layer is a glass layer or an air layer.

Compared with the prior art, the wavelength conversion device, light source device, and projection system provided by the present application can achieve high brightness and better color output without using color correction films.

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 fluorescent color wheel provided by the first embodiment of the present application.

Fig. 3 is a schematic structural diagram of a light source device provided by a second embodiment of the present application.

FIG. 4 is a schematic structural diagram of a light source device provided by a third embodiment of the present application.

FIG. 5 is a schematic structural diagram of a fluorescent color wheel in a light source device provided by a third embodiment of the present application.

FIG. 6 is a schematic diagram of the structure of a reflective sheet in a light source device according to a fourth embodiment of the present application.

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

FIG. 8 is a comparison diagram of the structure diagram of the offset film layer in the light source device provided in the fourth embodiment of the present application and the reflective sheet in the third embodiment.

FIG. 9 is a schematic structural diagram of a light source device provided by a fifth embodiment of the present application.

FIG. 10 is a schematic diagram of the structure of the dichroic plate in the light source device provided by the fifth embodiment of the present application.

FIG. 11 is a schematic structural diagram of a projection system provided by an embodiment of the present application.

Detailed ways

In order to facilitate the understanding of the present application, the embodiments of the present application will be described below in a more comprehensive manner with reference to related drawings. The drawings show preferred implementations of the embodiments of the present application. However, the embodiments of the present application can be implemented in many different forms, and are not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of this application more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terms used in the embodiments of the application herein are only for the purpose of describing specific implementation manners, and are not intended to limit the application.

In some projectors, color correction films are used to improve the color of the light beam. Generally, for wide-spectrum light sources, such as excited fluorescence or bulb light sources, in order to achieve the color standard of the standard color gamut, the color correction film is often used to filter some bands of the R, G or B primary color light spectrum. In addition, make the color of the base light better.

At present, there are also opto-mechanical solutions that use laser fluorescent light sources but do not use color correction films on the market. They are mainly divided into two types: one is to supplement the mixing of red and green lasers with fluorescence, and to combine R and G with the excellent colors of the laser. The color of the primary light is raised to the standard level; the second is that in some light-machine systems with low color requirements, the color is not modified, and fluorescence is directly used as the primary light, so that the color of the projection device cannot reach a higher color. Domain standard, but because there is no filter out, the brightness will be higher. However, none of these solutions can well solve the problem of the cost and the balance of the color gamut effect of the projection device.

Therefore, after long-term research, the inventor provides a light source device and a projection system that can achieve high brightness and better color output at a low cost without using color correction films.

The first embodiment

Please refer to FIG. 1, the present application provides a light source device 10 a. The light source device 10 a includes a light source 100, a wavelength conversion device 500 and a dichroic plate 300.

The light source 100 is used to emit excitation light. In some embodiments, the light source 100 may be a laser for generating excitation light, and the excitation light may be a laser. In this embodiment, the excitation light is a blue laser with a wavelength of approximately 440-470 nm. It can be understood that in some other embodiments, laser light sources of other colors may also be used as the light source 100 for emitting excitation light.

In this embodiment, the dichroic plate 300 is disposed between the light source 100 and the wavelength conversion device 500, and is located on the optical path of the excitation light emitted from the light source 100, and is used to guide the excitation light emitted by the light source 100 to the wavelength conversion device 500 , And receive the laser light and unconverted excitation light emitted by the wavelength conversion device 500, and guide the laser light to the subsequent optical path, and guide the unconverted excitation light to exit from other paths, so that the unconverted light doped in the laser light The excitation light is separated from the received laser light, and the unconverted excitation light does not enter the subsequent optical path.

Specifically, the dichroic film 300 can transmit the excitation light and reflect the laser light generated by the excitation of the excitation light. In this embodiment, the dichroic sheet 300 can transmit blue laser light and reflect the fluorescent light of other colors as the received laser light. It can be understood that the dichroic film 300 can pass through the blue laser light means that the blue laser light is incident from any side of the dichroic film 300 and can pass through the dichroic film 300.

In this embodiment, please refer to FIG. 1 again. The excitation light emitted by the light source 100 first passes through the dichroic plate 300 and enters the wavelength conversion device 500. In this embodiment, the wavelength conversion device 500 includes a fluorescent color wheel 510 and a color wheel. The motor 520, the color wheel motor 520 drives the fluorescent color wheel 510 to rotate.

Specifically, please refer to 2, the fluorescent color wheel 510 includes a fluorescent segment 512. The fluorescent section 512 is coated with fluorescent powder, and when excited by the excitation light, the fluorescent section 512 can generate a laser. Further, in this embodiment, as an example, the fluorescent segment 512 includes a first light segment 5121 and a second light segment 5122. Both the first light segment 5121 and the second light segment 5122 are covered with phosphors, and the second light segment 5122 is further covered with red light phosphors. When excited by the excitation light, red fluorescence can be generated. The second light segment 5122 is covered There are green phosphors, which can produce green fluorescence when excited by excitation light. When the excitation light is incident on the first light segment 5121 and the second light segment 5122 on the fluorescent color wheel 510, the excitation light excites the phosphor to produce fluorescence, but because the excitation light may not be completely absorbed by the phosphor, the excitation light There will be a small amount of unconverted excitation light mixed in the fluorescence, and these unconverted excitation light may affect the color gamut effect of the laser.

During the rotation of the fluorescent color wheel 510, when the excitation light is incident on the first light segment 5121 and the second light segment 5122, it will excite the corresponding phosphors on the first light segment 5121 and the second light segment 5122 to produce the corresponding color. Fluorescence is emitted toward the dichroic plate 300 along a direction perpendicular to the fluorescent color wheel 510. In this embodiment, the excited laser light can be red fluorescence and green fluorescence. In some other embodiments, the color of the phosphor coated on the fluorescent color wheel 510 can be changed to excite the laser light of the desired color. When the excited laser light is incident on the dichroic film 300, the dichroic film 300 reflects the laser light, and the reflected laser light can be used as the red light (R) and the green light (G) of the projection device.

Further, in some embodiments, the light source device 10a is further provided with a lens group 400, the lens group 400 is located between the dichroic plate 300 and the fluorescent color wheel 510, and is located in the excitation light transmitted from the dichroic plate 300 On the way. In this embodiment, the lens group 400 includes a first lens 410 and a second lens 420. The central optical axes of the first lens 410 and the second lens 420 are coaxially arranged, and the first lens 410 has a greater shape than the second lens 420. With a large lens surface, the first lens 410 is located on the side of the second lens 420 close to the dichroic plate 300, and the second lens 420 is located on the side of the first lens 410 close to the fluorescent color wheel 510. The convex surfaces of the first lens 410 and the second lens 420 are arranged in the direction of the dichroic plate 300. In this way, when the excitation light emitted from the light source 100 enters the lens group 400, it can be shifted by a predetermined angle.

In this embodiment, the received laser light reflected by the fluorescent section 512 of the fluorescent color wheel 510 passes through the lens group 400, is collimated under the action of the lens group 400, and is emitted to the direction perpendicular to the fluorescent color wheel 510. The dichroic sheet 300 reflects the fluorescent light.

In some other embodiments, the first lens 410 and the second lens 420 can also be arranged in the same size to satisfy the function of converging the excitation light to the fluorescent color wheel 510. And in some embodiments, the lens group 400 may further include one or more than two lenses.

For ease of description, please refer to FIG. 1 again. The solid arrow in FIG. 1 shows the optical path of the excitation light that is not converted into fluorescence, and the dotted arrow shows the optical path of the fluorescence generated by the excitation of the excitation light. In the light source device 10a provided in this embodiment, the excitation light emitted by the light source 100 enters the dichroic plate 300, and the dichroic plate 300 guides the excitation light emitted by the light source 100 to the wavelength conversion device 500. Under the action of the color wheel motor 520, the first light segment 5121 and the second light segment 5122 on the fluorescent color wheel 510 are periodically located on the light path of the excitation light. When the fluorescent section 512 is located on the light path of the excitation light, the excitation light excites the phosphor to make the fluorescent section 512 reflect the received laser light, and most of the excitation light is converted into fluorescence, and the excitation light that has not been converted into fluorescence is mixed and emitted from the received laser. The dichroic plate 300 receives the received laser light and the unconverted excitation light emitted by the wavelength conversion device 500, the dichroic plate 300 reflects the received laser light and then guides the received laser light to the subsequent optical path, while the dichroic plate 300 guides the unconverted excitation light to pass through The dichroic sheet 300 exits from other paths, and the other paths here refer to paths different from the received laser light.

In the light source device 10a provided in this embodiment, the dichroic plate 300 is provided to reflect the laser light generated by excitation. The unexcited excitation light will pass through the dichroic plate 300 to form an optical path different from the received laser light, so as to achieve the effect of filtering out the unconverted excitation light mixed in the received laser light.

Second embodiment

3, this embodiment provides a light source device 10b. The difference between the light source device 10b and the light source device 10a in the first embodiment lies in the function of the dichroic plate 300. In this embodiment, the dichroic plate 300 can reflect the excitation light and transmit other colors of laser light generated by the excitation light. For the structure and implementation of the same part, please refer to the related content in the first embodiment.

In this embodiment, the excitation light reflected by the light source 100 is a blue laser, and the dichroic plate 300 can reflect light in the wavelength range where the blue laser is located, and transmit light in other wavelength ranges.

In this embodiment, the excitation light emitted by the light source 100 is first emitted to the dichroic plate 300 and reflected by the dichroic plate 300 to the wavelength conversion device 500.

For ease of description, please refer to FIG. 3 again. In FIG. 3, the solid arrow shows the optical path of the excitation light, and the dotted arrow shows the optical path of the fluorescence (laser) excited by the excitation light. In the light source device 10b provided in this embodiment, the excitation light emitted by the light source 100 is directed to the dichroic plate 300, the dichroic plate 300 emits the excitation light and guides the excitation light to the wavelength conversion device 500, and the excitation light excites the phosphor to make the fluorescent segment 512 generates the received laser light, and the received laser light is emitted to the dichroic plate 300 through the light path perpendicular to the direction of the fluorescent color wheel 510. The dichroic plate 300 receives the received laser light and the unconverted excitation light emitted by the wavelength conversion device 500, dichroic The film 300 guides the received laser light through the dichroic film 300 to the subsequent optical path, while the dichroic film 300 reflects the unconverted excitation light and guides the unconverted laser light to the subsequent optical path. Here, other paths refer to different paths from the received laser light. path.

In the light source device 10b provided in this embodiment, the dichroic plate 300 is provided to transmit the excited laser light, while the unexcited excitation light will be reflected by the dichroic plate 300 to form an optical path different from that of the laser light. The effect of filtering out unconverted excitation light mixed in the received laser light.

The third embodiment

4 and 5, the present application provides a light source device 10c. The difference between the light source device 10c and the first embodiment is that in this embodiment, the fluorescent color wheel 510 of the wavelength conversion device 500 further includes a reflective section 511 And the light source device 10c further includes a reflecting mirror 600.

The dichroic plate 300 guides the excitation light emitted by the light source 100 to the fluorescent color wheel 510 of the wavelength conversion device 500. In this embodiment, the dichroic plate 300 periodically guides the excitation light to the fluorescent section 512 and the reflective section 511 respectively; At the same time, the dichroic plate 300 receives the laser light converted by the fluorescent section 512 of the wavelength conversion device 500, the excitation light not converted by the fluorescent section 512, and the excitation light reflected by the reflective section 511.

Referring to FIG. 6, in this embodiment, as a way, a reflective sheet 5133 is embedded in the reflective section 511, and the reflective sheet 5133 is used to reflect excitation light. When the excitation light enters the reflective sheet 5133 at a predetermined angle, it is reflected The excitation light and the excitation light incident on the reflective sheet 5133 are symmetrical along the normal direction, so that the optical path of the reflected excitation light does not coincide with the incident optical path.

It should be noted that the reflective sheet 5133 may be a reflective lens with pure reflection function, or a scattering reflective sheet with reflective and scattering functions. The scattering reflective sheet may be a reflective sheet with heat dissipation microstructures, wherein the scattering microstructures It can be a surface with periodic microstructures after physical or chemical treatment. The outline of the microstructure can be sine, rectangle, triangle or other regular or irregular geometric shapes. The characteristic size of the microstructure surface is generally in microns. Magnitude.

It can be understood that, in some embodiments, the excitation light may be offset by the lens group 400, and the offset excitation light is reflected when it enters the reflecting section 511 at a predetermined angle, and the optical path of the reflected excitation light is offset The subsequent excitation light is symmetric along the normal direction and enters the lens group 400 again. The lens group 400 straightens the reflected excitation light and then exits to the dichroic plate 300, so that the optical path of the excitation light emitted by the light source 100 is reflected The optical paths of the excitation light reflected by the segments 511 can be staggered with each other.

For ease of description, please refer to FIG. 4 again. In FIG. 4, the solid arrow shows the optical path of the excitation light, and the dotted arrow shows the optical path of the fluorescence generated by the excitation of the excitation light. In the light source device 10c provided in this embodiment, the excitation light emitted by the light source 100 enters the dichroic plate 300, and is transmitted and guided by the dichroic plate 300 to the wavelength conversion device 500, that is, irradiated to the fluorescent color wheel 510. Under the action of the color wheel motor 520, the fluorescent segment 512 and the reflective segment 511 on the fluorescent color wheel 510 are periodically located on the optical path of the excitation light. When the first light segment 5121 and the second light segment 5122 on the fluorescent color wheel 510 are on the light path of the excitation light, the excitation light will excite the phosphors on the first light segment 5121 and the second light segment 5122 to make the phosphor produce corresponding colors The received laser light is emitted toward the dichroic plate 300 through an optical path perpendicular to the direction of the fluorescent color wheel 510, and the unconverted excitation light passes through the dichroic plate 300 and is guided by the dichroic plate 300 to exit through other paths. On the other hand, when the reflection section 511 rotates to be located on the light path of the excitation light, the excitation light is reflected toward the dichroic plate 300 due to the action of the reflection sheet 5133 on the reflection section 511.

The dichroic plate 300 receives the laser light emitted from the wavelength conversion device 500, the unconverted excitation light, and the excitation light reflected by the reflection section 511, guides the received laser light into the subsequent optical path, and guides the unconverted excitation light to exit from other paths. The specific dichroic film 300 reflects the received laser light, and the reflected laser light is guided to the subsequent light path. At the same time, the dichroic film 300 transmits the unconverted excitation light and the excitation light reflected by the reflection section 511, and the excitation light transmits The dichroic sheet 300 is guided by the dichroic sheet 300 to another path for exit.

In this embodiment, the reflecting mirror 600 is located between the dichroic plate 300 and the light source 100 and is located on the optical path after the excitation light reflected by the reflecting section 511 passes through the dichroic plate 300.

When the excitation light is guided by the dichroic plate 300 to the reflecting mirror 600 and then reflected by the reflecting mirror 600, the excitation light reflected by the reflecting mirror 600 can make the excitation light enter the subsequent optical path according to a predetermined path. In this embodiment, the reflecting mirror 600 The reflected excitation light is incident toward the dichroic film 300, and passes through the dichroic film 300 again to combine with the received laser light and enter the subsequent optical path. In some embodiments, the reflector 600 can be arranged approximately parallel to the dichroic plate 300, so that the excitation light reflected by the reflector 600 and the laser light reflected by the dichroic plate 300 have approximately parallel exit light paths. .

In some embodiments, please refer to FIG. 4 again, the light source device 10c may also optionally include a homogenizing device 200 and a fly-eye lens group 700.

The homogenization device 200 is arranged between the light source 100 and the dichroic plate 300, and is located on the optical path of the excitation light emitted from the light source 100 to the dichroic plate 300. The homogenization device 200 can homogenize the excitation light emitted from the light source 100, The light homogenization device 200 may be a single compound eye, a double compound eye, or other devices with a light homogenization function, as long as the light homogenization function is satisfied.

The fly-eye lens group 700 includes two first fly-eye lenses 710 and a second fly-eye lens 720 arranged in mirror symmetry, and each fly-eye lens is formed by a combination of a series of small lenses. Applying the double-row fly-eye lens array to the lighting system can obtain high light energy utilization and large-area uniform lighting. In this embodiment, the convex surface of the fly-eye lens is located outside of the fly-eye lens group 700. The fly-eye lens group 700 is used to receive the fluorescence reflected by the dichroic plate 300 and the excitation light reflected by the second mirror 600 and emit it, so as to improve the utilization of the laser light and excitation light reflected and transmitted from the dichroic plate 300 Rate, and play a role in homogenization.

In the light source device 10c provided in this embodiment, the dichroic plate 300 is provided to separate the received laser light from the unconverted excitation light mixed in the received laser light, and make it emit along different paths, so as to achieve the effect of the excitation light in the received laser light. The filtering effect.

Fourth embodiment

Referring to FIG. 7, this embodiment provides a light source device 10d. The difference between this embodiment and the third embodiment is that the wavelength conversion device 500 includes a reflective section 511 and a fluorescent color section 512. The fluorescent color section 512 can be one or two. One or more, the reflection section 511 is provided with an offset film layer 513, and the reflection system 900 is provided at the same time, so that the optical path of the excitation light is changed. For the same part, please refer to the first or third embodiment.

Referring to FIG. 8, in this embodiment, the reflective section 511 has an offset film layer 513. The offset film layer 513 includes a transmission film layer 5132, a transmission medium film layer 5134, and a reflection film layer 5131 that are sequentially arranged along the incident light path direction. The dielectric film layer 5134 has a predetermined thickness. Specifically, the reflective film layer 5131 is located on the side of the transmissive film layer 5132 away from the dichroic film 300, the propagation medium film layer 5134 is located between the transmissive film layer 5132 and the reflective film layer 5131, and the transmissive film layer 5132 can transmit excitation light. It can be understood that the propagation medium film layer 5134 may be any propagation medium layer, such as a glass layer, an air layer, and the like. In this embodiment, the excitation light is transmitted from the transmission film layer 5132 and then propagates through the transmission medium film layer 5134 to the reflection film layer 5131, is reflected by the reflection film layer 5131 and then enters the transmission film layer 5132 through the transmission medium film layer 5134 again, and from The transmission film layer 5132 emits light. Referring to FIG. 8, compared with the excitation light in (b) directly incident on the reflective sheet 5133 and then reflected out, the excitation light in (a) first transmits through the transmissive film layer 5132, then enters the reflective film layer 5131, and then passes through the reflective film layer. The 5131 reflection is incident on the transmissive film layer 5132 again, and is emitted from the transmissive film layer 5132 as the receiving laser. At this time, the light emitted from the transmissive film layer 5132 is offset from the light directly reflected by the reflective sheet 5133. The received laser light does not coincide with the beam of the excitation light incident on the reflection section 511.

Please refer to FIG. 8 again. The solid arrow in the figure shows the light path of the excitation light incident on the reflection section 511. When the reflection section 511 is located on the excitation light path, the excitation light first passes through the transmission film on the offset film 513. The 5132 then propagates to the reflective film layer 5131, and is reflected and scattered by the reflective film layer 5131, so that the optical path of the excitation light offset by the offset film 513 is offset relative to the optical path of the excitation light reflected by the fluorescent segment 512. Due to the change of the exit angle and position from the offset film layer 513, further, the light path of the excitation light will also be deflected after exiting the lens group 400, and the deflected excitation light enters the dichroic plate 300 and passes through the dichroic plate 300. And it is guided by the dichroic film 300 to exit.

It should be noted that the reflective film layer 5131 may be a reflective film layer having a pure reflection function, or a scattering reflection film layer having a reflection function and a scattering function.

Please refer to FIG. 7 again, the reflector 600 is located on the light path of the excitation light emitted from the dichroic plate 300 after being reflected by the offset film 513. Due to the large offset of the offset film 513, the light reflected and scattered by the reflective scattering section 511 has a deflection angle compared to the light path of the excitation light reflected by the fluorescent section 512 that is not absorbed by the fluorescent color wheel 510. With this deflection angle, the reflector 600 only receives and reflects the excitation light reflected by the offset film 513, and cannot receive the excitation light that enters the dichroic plate 300 along the optical path of the laser light and passes through the dichroic plate 300. In turn, the excitation light reflected by the fluorescent segment 512 that is not converted by the fluorescent color wheel 510 is guided by the dichroic plate 300 to exit from other paths, and cannot enter the subsequent optical path, achieving the purpose of filtering the unconverted excitation light.

In this embodiment, the reflector 600 reflects the excitation light in a direction away from the fly-eye lens group 700. As an embodiment, the excitation light reflected by the reflector 600 is approximately parallel to the optical path of the fluorescent light reflected by the dichroic plate 300. It is noted that here, the optical path of the excitation light reflected by the mirror 600 is parallel to the optical path of the fluorescent light reflected by the dichroic plate 300, and it does not specifically mean that the two optical paths are emitted in the same direction.

Please refer to FIG. 7 again. In some embodiments, the light source device 10d may further include a reflection system 900, which is located on the optical path of the excitation light reflected by the second mirror 600, and the reflection system 900 is used to pass one reflection or multiple reflections. The excitation light reflected by the mirror 600 is reflected once and the excitation light is guided to the dichroic plate 300, so that the excitation light is guided by the dichroic plate 300 and then exits along the same optical path as the received laser light. As an example, in this embodiment, the reflection system 900 includes a third reflection mirror 910 and a fourth reflection mirror 920. The excitation light emitted from the reflection mirror 600 is incident on the third reflection mirror 910 and is reflected by the third reflection mirror 910. To the fourth reflecting mirror 920, the fourth reflecting mirror 920 then reflects and guides the excitation light to the dichroic sheet 300, and then exits through the dichroic sheet 300. The light path after exiting from the dichroic sheet 300 and the light path of the received laser light Similarly, enter the fly-eye lens group 700. As an implementation manner, the third reflector 910 and the fourth reflector 920 can be arranged substantially perpendicular to each other, and the reflective surface of the third reflector 910 and the reflective surface of the fourth reflector 920 are arranged opposite to each other.

Please refer to FIG. 7, as an implementation manner, the light source device 10 d may also optionally include a beam expander 800. The beam expander 800 is located on the optical path of the excitation light reflected by the reflector 600. It can be understood that the beam expander 800 can be located between the reflector 600 and the third reflector 910, or can be located between the fourth reflector 920 and the fourth reflector 920. Between the three mirrors 910, it may also be located between the fourth mirror 920 and the dichroic plate 300. The beam expander 800 collects the excitation light reflected by the mirror 600, expands the excitation light, and then exits to the dichroic plate 300. The light spot of the excitation light after beam expansion is enlarged, and the optical expansion amount of blue light is increased.

In this embodiment, the beam expanding device 800 includes a third lens 810 and a fourth lens 820. The third lens 810 and the fourth lens 820 are arranged in parallel with the central optical axis, the third lens 810 is arranged between the mirror 600 and the third mirror 910, and the fourth lens 820 is arranged on the fourth mirror 920 and the dichroic plate 300 And the third lens 810 has a larger lens surface than the fourth lens 820. After the excitation light is reflected by the reflector 600, it first passes through the third lens 810, and then passes through the reflection system 900 after exiting the third lens 810. The third reflecting mirror 910 and the fourth reflecting mirror 920 of the second lens enter the fourth lens 820 and exit from the fourth lens 820 to the dichroic plate 300.

In some other embodiments, the third lens 810 and the fourth lens 820 can also be set to be the same size, so that the excitation light can be expanded. And in some embodiments, the beam expander 800 may also include one or more than two lenses, or in some embodiments, the beam expander 800 may also use a prism beam expander.

In some embodiments, the light source device 10d can also optionally include a homogenizing member 830, which is used to homogenize the excitation light, and the homogenizing member 830 can be arranged between the reflector 600 and the dichroic plate 300. Between the light path. As an embodiment, the homogenizing member 830 may be disposed after the beam expander 800, that is, the excitation light after the beam expander 800 passes through the homogenizer 830, so that the cross-sectional distribution of the expanded excitation light is more uniform.

In this embodiment, referring to FIG. 7, the homogenizing member 830 is located on the optical path between the third lens 810 and the reflection system 900, and the homogenizing member 830 is disposed on the optical path of the third lens 810. The homogenizing member 830 can improve After the excitation light passes through the offset film 513, the lens group 400, and the reflector 600, the excitation light is no longer uniform in cross-sectional distribution due to factors such as angles.

Further, the excitation light passes through the action of the light homogenizer 930 and the beam expander 800, the excitation light is expanded and homogenized at the same time, and the excitation light beam has a larger cross-sectional area. After exiting the dichroic plate 300, it enters the compound eye The lens group 700 allows the excitation light to obtain more compound eye units, and the light homogenization effect is better.

For ease of description, please refer to FIG. 7 again. The dotted arrow in FIG. 7 shows the optical path of the fluorescence generated by the excitation light, and the solid arrow shows the optical path of the excitation light. Compared with the third embodiment, this embodiment has the same optical path of the laser light excited by the excitation light, and the same optical path of the excitation light before entering the offset film 513. For the same part, please refer to the third embodiment.

The difference is that, as shown in FIG. 8, when the fluorescent color wheel 510 rotates to the reflection and scattering section 511, the excitation light first passes through the transmission film layer 5132 of the offset film layer 513 and propagates to the reflection film layer 5131, and is reflected and scattered, exciting When the light exits, it is deflected so that the excitation light emitted from the lens group 400 and the light path of the received laser light are no longer parallel, so that the excitation light reflected by the reflection scattering section 511 has a different optical path from the blue laser mixed with red fluorescence or green fluorescence. The reflector 600 can only receive the excitation light reflected by the reflection scattering section 511 and reflect it to the reflection system 900, while the blue laser light mixed in the red fluorescence or green fluorescence cannot be reflected by the reflector 600 after passing through the dichroic plate 300 Therefore, it cannot enter the reflection system 900 and subsequent optical paths along the light path of the excitation light, which realizes the filtering of the unconverted excitation light in the received laser light and improves the color gamut effect of the received laser light.

In the light source device 10d provided in this embodiment, the offset film layer 513 is provided to produce an angular difference between the excitation light and the excitation light not absorbed by the phosphor. By using this angle difference, it is possible to distinguish between the excitation light and the fluorescent light. The absorbed excitation light and the unabsorbed excitation light in the received laser light will be separated from the excitation light reflected by the reflection and scattering section 511 to achieve the purpose of filtering out the excitation light that has not been converted by the phosphor, and ensure that the fluorescence entering the fly eye lens group 700 has Very good color gamut effect.

It should be noted that the reflection system 900, the beam expander 800, etc. disclosed in this embodiment can also be applied to the first and second embodiments, and are located in the subsequent optical path of the separated excitation light to achieve reflection or expansion. For the specific implementation of the beam function, please refer to the above content, which will not be repeated here.

Fifth embodiment

Fig. 9 shows a light source device 10e provided by a fifth embodiment of the present application. The difference between the light source device 10e provided in this embodiment and the fourth embodiment includes: the light source device 10e further includes a compensation light source 110, and the fly-eye lens group 700 is not provided. Please refer to the fourth embodiment for the same part.

Referring to FIG. 9, the light source device 10e further includes a compensation light source 110, and the compensation light source 110 is used for emitting compensation light. In some embodiments, the compensation light source 110 may be a laser for generating laser light of a corresponding color, which can compensate the fluorescence of the corresponding color after entering the light path, and improve the color gamut effect of the fluorescence of the corresponding color. In this embodiment, the compensation light source 110 emits a red laser, and the compensation light emitted by the compensation light source passes through the third reflector 910, so that the compensation light is combined with the excitation light at the third reflector 910. It can be understood that in some other embodiments, other light sources such as green light may also be used as the compensation light source 110 for emitting green laser light as the compensation light.

In some embodiments, the compensation light source 110 may be directly located on the light path of the fluorescent light, and combine with the fluorescent light of the corresponding color to emit light. Or the compensation light emitted by the compensation light source 110 undergoes one or more of operations such as reflection, transmission, homogenization, and beam expansion, and then is combined with the fluorescent light of the corresponding color and then emitted.

10, in this embodiment, the area on the dichroic film 300 is coated to form a first area 310 and a second area 320 adjacent to each other. The first area 310 is surrounded by the second area 320, that is, the second area 320. It surrounds the first area 310. Wherein, the second region 320 can transmit the excitation light and reflect the laser light formed by the excitation light of the fluorescent segment 512. The first region 310 can transmit visible light, that is, can transmit compensation light and excitation light.

The compensation light emitted by the compensation light source 110 passes through the dichroic plate 300 through the first region 310 and is combined with the received laser light before being emitted, which can improve the color gamut effect of the corresponding color fluorescence. For example, when the fluorescent color wheel 510 rotates until the first light segment 5121 corresponds to the excitation light incident on the fluorescent color wheel 510, red fluorescent light is generated. At this time, the red fluorescent light is reflected to the second area 320 of the dichroic plate 300 and then is reflected. . At this time, the compensation light emitted by the compensation light source 110 passes through the first area 310 and passes through the dichroic plate 300 to combine with the red fluorescence light to exit. The compensation light emitted by the compensation light source 110 may be directly incident on the first area 310 or may pass through the first area 310. After or multiple reflections, it enters the first area 310.

In this embodiment, the compensation light source 110 is incident on the third reflecting mirror 910 and guided by the third reflecting mirror 910 into the fourth reflecting mirror 920, and guided by the fourth reflecting mirror 920 to the dichroic plate 300. In some embodiments, in order to homogenize the compensation light, the position of the homogenizer 830 is set on the optical path of the third mirror 910 and the fourth mirror 920, so that the homogenizer 830 can not only stimulate the light The light is homogenized, and the compensated red light passing through the third reflector 810 can also be homogenized.

Referring to FIG. 9, the light source device 10e may further include a fifth lens 120, which is located on the optical path between the compensation light source 110 and the third reflector 910, and the fifth lens 120 may expand the compensation light. At the same time, since the compensation light has the same optical path as the reflected excitation light after passing through the third reflector 910, by providing the fifth lens 120 and the fourth lens 820, the speckle formed by the combination of the compensation light and the excitation light can be eliminated. It is understandable that, in order to prevent the compensation light from being mixed into the fluorescence and excitation light of other colors, the compensation light source 110 may only rotate the fluorescent color wheel 510 to the light segment of the phosphor of the corresponding color corresponding to the excitation light incident on the fluorescent color wheel 510. When the fluorescent color wheel 510 is turned on when the other light segments correspond to the excitation light incident on the fluorescent color wheel, it is turned off.

Further, in this embodiment, in order to convert the round spot formed by combining the excitation light, the compensation light, and the fluorescent light into a rectangular spot, a square rod system 730 is provided on the optical path of the combined light reflected by the dichroic plate 300 The square rod system 730 includes a sixth lens 731 and a square rod 732. The fluorescent light reflected by the dichroic plate 300 and the compensation light and excitation light transmitted through the dichroic plate 300 first pass through the sixth lens 731 and pass from the sixth lens 731. Shoot out, enter the square rod 732 and shoot out. It should be noted that the square rod system 730 can also be applied to the foregoing embodiments, or replaced by the fly-eye lens group 700 in the foregoing embodiments or combined with the fly-eye lens group 700.

For ease of description, please refer to FIG. 9 again. The dotted arrow in FIG. 9 shows the optical path of the laser light generated by excitation by the excitation light, and the solid arrow shows the optical path of the excitation light. In the light source device 10e provided in this embodiment, after the compensation light is added, the compensation light passes through the third reflector 910 and then combines with the excitation light, and then passes through the fifth lens 120, the fourth lens 820, and the light homogenizing member 830 after the combined light. , Eliminate the speckles formed after the compensation light and the excitation photosynthesis light. The excitation light and the compensation light pass through the dichroic plate 300 and then combine with the fluorescent light to enter the square rod system 730. Under the action of the square rod system 730, the combined round light spot is converted into a rectangular light spot.

In some other embodiments, the compensation light source of the red laser and the compensation light source of the green laser can also be provided at the same time. It should be noted that the implementation of enhancing the brightness of the fluorescence of the corresponding color by setting the compensation light source to emit the compensation light can also be applied to any of the foregoing embodiments, and the specific implementation can be referred to the above content, which will not be omitted here. Go into details.

In the light source device 10e provided in this embodiment, on the basis of filtering the unconverted excitation light in the received laser light, after adding the compensation light, the power density of the received laser light for exciting the corresponding color can be increased, thereby obtaining higher brightness. , Correspondingly improve the brightness of the entire optical machine system.

11, this application also provides a projection system 1, the projection system 1 is installed with a light source device 10a, it should be noted that in the projection system 1, the light source device 10a can be composed of the above-mentioned

light source devices

10b, 10c, 10d And 10e replacement. It can be understood that the projection system 1 may also include components such as a housing 11, a processing unit 12, and a power supply module 13.

The above-mentioned embodiments only express several implementation manners of the present application, and their description is relatively specific and detailed, but they should not be understood as a limitation to the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

A light source device, characterized in that it comprises:

Light source, used to emit excitation light;

A wavelength conversion device, including a fluorescent color segment, for converting the incident excitation light into a received laser light;

The dichroic plate is arranged between the light source and the wavelength conversion device, and is used to guide the excitation light emitted by the light source to the wavelength conversion device and receive the wavelength conversion device emitted The laser light and the unconverted excitation light;

The dichroic plate is also used to guide the received laser light to a subsequent optical path, and guide the unconverted excitation light to exit from other paths.
The light source device according to claim 1, wherein the wavelength conversion device further comprises a reflection section for reflecting the incident excitation light and then emitting it, wherein the excitation light enters the incident portion of the reflection section. The light path and the reflected light path are different light paths;

The light source device further includes a reflector, the reflector is located in the light path after the reflected excitation light passes through the dichroic plate, and is used to reflect the excitation light back to the dichroic plate, After being guided by the dichroic plate, it exits along the same optical path as the received laser light.
4. The light source device according to claim 2, wherein an offset film layer is embedded in the reflection section, and the offset film layer is used to offset the exit light of the excitation light emitted from the reflection section Path, so that the shifted excitation light does not coincide with the light beam of the received laser light emitted from the fluorescent color segment.
The light source device according to claim 3, wherein the offset film layer comprises a transmission film layer and a reflection film layer, and the transmission film layer and the reflection film layer are separated by a set distance;

The excitation light is transmitted from the transmissive film layer and then propagated to the reflective film layer. After being reflected by the scattering reflective film layer, the excitation light enters the transmissive film layer again, and exits from the transmissive film layer.
The light source device according to claim 2, wherein the light source device further comprises a reflection system, the reflection system receives the excitation light reflected by the reflector, and guides the excitation light to the two-way Color film, so that the excitation light is guided by the dichroic film and emitted along the same optical path as the received laser light.
The light source device according to claim 5, wherein the light source device further comprises a beam expander, and the beam expander is located in the optical path from the reflector to the dichroic plate.
The light source device according to any one of claims 1 to 6, wherein the light source device further comprises a compensation light source, and the compensation light emitted by the compensation light source is combined with the received laser light and then emitted.
The light source device according to claim 5, wherein the light source device comprises a compensating light source, the compensating light source is guided to the dichroic plate through the reflection system, and the dichroic plate is used for incident light The received laser light and the compensation light combine light.
8. The light source device according to claim 8, wherein the dichroic plate includes a first area and a second area adjacent to each other, and the second area can transmit the excitation light and reflect the received laser light. The first area can transmit the supplementary light, wherein the supplementary light and the received laser light at least partially overlap in spectrum.
9. The light source device according to claim 9, wherein the second area is arranged around the first area.
The light source device according to claim 1, wherein the light source device further comprises a light homogenizing device, and the light homogenizing device is used to homogenize the excitation light emitted by the light source.
The light source device according to claim 1, wherein the light source device further comprises a lens group, and the lens group is located on an optical path between the dichroic plate and the wavelength conversion device.
The light source device according to claim 1, wherein the light source device further comprises a fly-eye lens group, and the fly-eye lens group is located on the optical path of the received laser light and the excited light emitted through the dichroic plate.
A projection system installed with the light source device according to any one of claims 1 to 13.
A wavelength conversion device, which is characterized by comprising a reflection section and at least one fluorescent color section, wherein the fluorescent color section is used to convert incident excitation light into a received laser light, and the reflection section is used to convert the incident light The excitation light is reflected and emitted;

When the incident light path incident on the reflective section and the reflected exit light path are different light paths, the reflective section is also used to shift the exit light path of the excitation light emitted from the reflective section.
The wavelength conversion device according to claim 15, wherein the reflection section comprises a transmission film layer, a transmission medium film layer, and a reflection film layer sequentially arranged along the incident light path direction, wherein the transmission medium film layer has Set the thickness.
The wavelength conversion device according to claim 16, wherein the propagation medium film layer is a glass layer or an air layer.