WO2017118299A1

WO2017118299A1 - Light source module, light source control method therefor, and projection system

Info

Publication number: WO2017118299A1
Application number: PCT/CN2016/111688
Authority: WO
Inventors: 胡飞; 唐怀; 周日鸣; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2016-01-07
Filing date: 2016-12-23
Publication date: 2017-07-13
Also published as: CN106950786A; CN106950786B

Abstract

A light source module, a light source control method therefor, and a projection system. The light source module comprises: a first light source (10), emitting first exciting light rays; a second light source (11), emitting second exciting light rays; a color wheel (13) provided with at least one wavelength conversion material, the wavelength conversion material generating first excited light rays after absorbing the first exciting light rays, and generating second excited light rays after absorbing the second exciting light rays; and a light source control circuit (12), connected to the first light source (10) and the second light source (11), the light source control circuit (12) being used for controlling the light intensity of the first exciting light rays and the light intensity of the second exciting light rays according to a pre-established correspondence between currents of the first light source (10) and the second light source (11), so that color coordinates of white light rays combined by the first excited light rays, the second excited light rays, unabsorbed first exciting light rays and unabsorbed second exciting light rays are kept within a preset range.

Description

Light source module and light source control method thereof, projection system

Technical field

The present invention relates to the field of optical technologies, and more particularly to a light source module, a light source control method thereof, and a projection system.

Background technique

At present, cinema projectors on the market use xenon lamps as projection sources. However, such lamps have a short life span of only one thousand or even hundreds of hours. Based on this, the prior art provides a light source using advanced laser phosphor display technology as a projection light source of a cinema projector. The lifetime of such a light source is more than 20,000 hours, but the color coordinates and color temperature of such a light source will follow The power changes.

A prior art light source based on laser phosphor display technology includes a blue light emitting blue laser that excites a color wheel provided with a yellow phosphor to generate yellow light, wherein blue and yellow phosphors that are not absorbed by the yellow phosphor are excited to generate The yellow light combines to produce the white light required for projection. In this technique, the specific phosphor of the yellow phosphor, that is, the ratio of the yellow light emitted by the phosphor to absorb blue light and the unabsorbed blue light is determined when the color wheel is manufactured, and the projected image will eventually satisfy DCI (Digital Copyright). Identifier, the digital copyright unique identifier) standard range.

In the prior art, another illumination device includes blue excitation light, a red and green phosphor on the color wheel and a transparent region, and the blue excitation light excites the red and green phosphors on the rotating color wheel to sequentially generate red light and green light. The light and the blue light are transmitted, and a specific phosphor is selected, so that the ratio of the finally emitted red, green, and blue light is determined and satisfies the DCI (Digital Copyright Identifier) standard range.

Both of the above methods can achieve high-brightness projection display, but one has problems that have been solved by people in the field. When the lighting device is applied to different projection occasions, the demand for DCI will be different. In order to meet different needs, the existing practice is to customize different lighting devices for different DCI. However, if the application of the lighting device changes, the lighting device is replaced, the cost is very high, and the operation is troublesome, especially the cinema machine, the same movie theater, because different The screening needs may require replacement of different lighting fixtures.

In order to meet the projection requirements, the replacement of the lighting device by the projection device inevitably causes waste of human resources, and at the same time increases the cost of the projection device.

Summary of the invention

In view of the above, the present invention provides a light source module, a light source control method thereof, and a projection system, which solve the problem of the labor waste and the increase of cost caused by replacing the lighting device in the prior art projection to meet the needs of different occasions.

To achieve the above objective, the present invention provides the following technical solution: a light source module, including:

a first light source that emits a first excitation light;

a second light source that emits a second excitation light;

a color wheel having at least one wavelength converting material, the wavelength converting material absorbing the first excitation light to generate a first laser beam, and absorbing the second excitation light to generate a second laser beam;

a light source control circuit connected to the first light source and the second light source, wherein the light source control circuit is configured to control the light intensity of the first excitation light according to a pre-established current correspondence relationship between the first light source and the second light source And a light intensity of the second excitation light to maintain color coordinates of the white light synthesized by the first laser light, the second laser light, the unabsorbed first excitation light, and the unabsorbed second excitation light Within the preset range.

Preferably, the light source control circuit controls the current of the first light source and the current of the second light source according to a current correspondence relationship between the first light source and the second light source that are established in advance to control the current of the first light source. To control the light intensity of the first excitation light, and control the light intensity of the second excitation light by controlling the current of the second light source.

Preferably, the light source control circuit controls currents of the first light source and the second light source by pulse width modulation.

Preferably, the first light source comprises a plurality of first light emitting devices, and the second light source comprises a plurality of second light emitting devices;

The light source control circuit controls the light intensity of the first excitation light by controlling the number of opening of the first light emitting device, and controls the light of the second excitation light by controlling the number of the second light emitting device to be turned on. Strong.

Preferably, the first excitation light and the second excitation light are blue light, and the first received laser light and the second received laser light are yellow light;

Alternatively, the first excitation light and the second excitation light are blue light, and the first received laser light and the second received laser light are mixed light of red light and green light.

Preferably, the first excitation light is blue light having a wavelength of 440 nm to 455 nm, and the second excitation light is blue light having a wavelength of 465 nm.

A projection system comprising the light source module of any of the above.

A light source control method for a light source module is applied to the light source module according to any one of the preceding claims, wherein the light source control method comprises:

Controlling a light intensity of the first excitation light emitted by the first light source and a second excitation light emitted by the second light source to excite the first laser light and the second excitation light excited by the first excitation light The color coordinates of the white light synthesized by the second laser light, the unabsorbed first excitation light, and the second excitation light are kept within a preset range.

Preferably, the process of controlling the light intensity of the first excitation light emitted by the first light source and the light intensity of the second excitation light emitted by the second light source comprises:

Controlling a current of the first light source and a current of the second light source according to a pre-established current correspondence relationship between the first light source and the second light source to control the first excitation light by controlling a current of the first light source The light intensity is controlled by controlling the current of the second light source to control the intensity of the second excitation light.

Preferably, when the first light source comprises a plurality of first light emitting devices, and the second light source comprises a plurality of second light emitting devices, the controlling the light intensity of the first excitation light emitted by the first light source and the second light source emitting The process of the intensity of the second excitation light includes:

Controlling the intensity of the first excitation light emitted by the first light source by controlling the number of opening of the first light emitting device, and controlling the second light source to emit by controlling the number of the second light emitting device to be turned on The intensity of the two excitation lights.

Compared with the prior art, the technical solution provided by the present invention has the following advantages:

The light source module and the light source control method thereof and the projection system provided by the invention, the light source control circuit controls the light intensity of the first excitation light and the light of the second excitation light according to the current correspondence relationship between the first light source and the second light source which are established in advance Strongly, such that the color coordinates of the first laser light, the second laser light, the unabsorbed first excitation light, and the unabsorbed second excitation light are maintained within a predetermined range, that is, It is said that when the intensity of the first excitation light changes, the light source control circuit changes the light intensity of the second excitation light according to the pre-established current correspondence between the first light source and the second light source, so that the light source module is finally synthesized. The color coordinates of the white light remain within the preset range, that is, the standard range of the DCI is satisfied;

Moreover, the present invention can adjust the light intensity, color gamut and color coordinates of the synthesized white light by adjusting the light intensity of the first excitation light and the second excitation light, thereby avoiding the light source module in the prior art to meet the different needs of the user. The operation caused by the replacement is complicated and the cost is high.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can obtain other drawings according to the provided drawings without any creative work.

1 is a schematic structural diagram of a light source module according to an embodiment of the present invention;

2 is a schematic structural view of a first color wheel in the light source module shown in FIG. 1;

3 is a spectrum diagram of first excitation light, second excitation light, first fluorescence, and second fluorescence according to an embodiment of the present invention;

4 is a schematic structural diagram of a color coordinate measuring system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of current variation curves of a first light source and a second light source according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

An embodiment of the present invention provides a light source module. Referring to FIG. 1 , the light source module includes a first light source 10 that emits first excitation light, a second light source 11 that emits second excitation light, and a first light source 10 . A light source control circuit 12 and a color wheel 13 connected to the second light source 11.

Referring to FIG. 2, the color wheel 13 includes an annular region 130 on the optical path of the first light source 10 and the second light source 11, and the annular region 130 has at least one wavelength converting material, and the wavelength converting material absorbs the first A first laser beam is generated after the excitation light, and a second laser beam is generated after the second excitation light is absorbed.

In this embodiment, the light source control circuit 12 controls the currents of the first light source 10 and the second light source 11 according to the correspondence between the currents of the first light source 10 and the second light source 11 that are established in advance to control the current of the first light source 10. Controlling the intensity of the first excitation light, controlling the intensity of the second excitation light by controlling the current of the second light source 11, so that the first laser light excited by the first excitation light and the second excitation light excited by the second excitation light The color coordinates of the laser light and the white light synthesized by the first excitation light and the second excitation light that are not absorbed are kept within a preset range.

The embodiment of the invention can adjust the light intensity, color gamut and color coordinates of the white light in the final emitted light by adjusting the light intensity of the first excitation light and the second excitation light, which can meet different white light requirements of the user without replacing the light source. The module saves replacement costs and makes the adjustment process simple and easy to operate. For example, when the light source module is applied to a projector, different projection requirements require different white light. In this case, only the current of the first light source 10 and the current of the second light source 11 need to be adjusted, so that the unabsorbed first can be adjusted. The ratio of the excitation light, the second excitation light that is not absorbed, the first excitation light, and the second excitation light, thereby adjusting the intensity, color gamut, and color coordinates of the synthesized white light.

In this embodiment, the first light source 10 and the second light source 11 are lasers that emit blue light. Of course, in other embodiments, the first light source 10 and the second light source 11 may also be light emitting diodes or lasers that emit ultraviolet light. . Further, the first excitation light may be blue light having a wavelength of 440 nm or 455 nm, and the second excitation light may be blue light having a wavelength of 465 nm.

In this embodiment, the annular region 130 has a wavelength converting material, and the wavelength converting material is a yellow phosphor, that is, both the first received laser and the second received laser are yellow. Of course, in other embodiments, the annular region 130 may have two wavelength conversion materials, the two wavelength conversion materials being red phosphor and green phosphor, that is, the first received laser and the second received laser are both mixed light of red light and green light, wherein the first received light The wavelength of the red light included in the laser and the red light included in the second received laser are different, and the wavelength of the green light included in the first received laser and the green light included in the second received laser are different.

In this embodiment, since the first excitation light and the second excitation light are blue light having different wavelengths, the excitation efficiency of the excitation phosphors is also different. The spectrum of the first excitation light A, the second excitation light B, the first received laser C, and the second received laser D is as shown in FIG. 3, and the first excitation light A is mostly used. The first received laser light C is excited, and a small portion is used to synthesize white light with the first received laser light C. A small portion of the second excitation light B is used to excite the second received laser light D, and a small portion is used to synthesize white light with the second received laser light D. Based on this, when the power of the first light source 10 or the second light source 11 changes, the current of the first light source 10 or the second light source 11 also changes, and the light intensity of the first excitation light A and the second excitation light B also There will be a change, and the excitation efficiency and intensity of the first laser C and the second laser D will also change, that is, the ratio of the first laser C and the second laser D in white light will change, resulting in synthesis. The color coordinates of the white light change. Therefore, in the present embodiment, the currents of the first light source 10 and the second light source 11 are controlled by the established correspondence of the currents of the first light source 10 and the second light source 11 so that the color coordinates of the finally synthesized white light remain unchanged.

In this embodiment, the correspondence between the currents of the first light source 10 and the second light source 11 is a current value according to the first light source 10 within a preset current range and a white light corresponding to the current value of each of the first light sources 10. The color coordinate is established by the current value of the second power source 11 maintained within the preset range.

The specific process of establishing the correspondence between the currents of the first light source 10 and the second light source 11 is as follows:

Step 1: Turn on the light source module 1 to emit white light, adjust the current value of the first light source 10 to a current value I1 such as 2.5A, and adjust the current value of the second light source 11 to a current value I1' such as 2.2A, and use The illuminance meter 2 measures the color coordinates (x, y) of the white light projected onto the screen 3 at this time, and referring to FIG. 4, the color coordinates are within a preset range, that is, within the DCI standard range;

Step 2, adjusting the current value of the first light source 10 to I2, such as 2.4A, and then adjusting the current of the second light source 11, while measuring the color coordinates of the white light using an illuminometer, when the color coordinates of the white light are equal or close to the previous color coordinates. At the time, the current value I2' of the second light source 11 is recorded;

Step 3, the current value of the first light source 10 is sequentially decreased by 0.1A to obtain I3, I4, I5, ... In, and then the second step is repeated until the one-to-one corresponding to I3 to In is found so that the color coordinates of the white light remain unchanged. The current values I3', I4', I5'...In' of the two light sources 11 can obtain the current correspondence between the first light source 10 and the second light source 11, and can be recorded into the control chip of the light source control circuit.

After the current correspondence between the first light source 10 and the second light source 11 is established, for example, when the current value of the first power source 10 becomes I3, it is only necessary to adjust the current value of the second light source to I3' by the light source control circuit. The color coordinates of the white light emitted by the light source module meet the DCI standard range within a preset range.

Of course, the current correspondence between the first light source 10 and the second light source 11 is not unique, that is, the current value of the obtained first light source 11 may exist within a certain range, as long as the color coordinates of the final white light are within a preset range. . As shown in Table 1, the first set of currents at the first source 10 and the second source 11 In the corresponding relationship, when the current of the first light source 10 is 2.5A, the current of the second light source 11 is 2.16A; in the second set of current correspondence relationship between the first light source 10 and the second light source 11, the current of the first light source 10 When it is 2.1 A, the current of the second light source 11 is 2.00 A. The specific values of the two current correspondences of the first light source 10 and the second light source 11 provided by the present invention are shown in Table 1. FIG. 5 is a schematic diagram of current variation curves drawn according to the first group of current correspondences.

Table 1

When the current of the first light source 10 changes, such as when changing from 2.5A to 1.3A, the intensity of the first excitation light also changes. At this time, the light source control circuit 12 according to the first light source shown in Table 1. 10 and the current relationship of the second light source 11, the current of the second light source 11 is adjusted to 1.9A to adjust the light intensity of the second excitation light; likewise, when the current of the second light source 11 changes, such as from 2.16A When the change is 1.50A, the intensity of the second laser light is also changed. At this time, the light source control circuit 12 will use the first light source 10 according to the current correspondence between the first light source 10 and the second light source 11 shown in Table 1. The current is adjusted to 0.9A to adjust the intensity of the first excitation light such that the color coordinates of the first excitation light, the second excitation light, the first laser received light, and the second laser-combined white light are maintained at Within the standard range.

Specifically, the light source control circuit 12 in this embodiment can control the currents of the first light source 10 and the second light source 11 by pulse width modulation. Of course, the light source control circuit 12 can also change the first light source 10 and the first method by other means. The current of the two light sources 11 is not limited to this.

In the light source module provided by the embodiment, the light source control circuit controls the currents of the first light source and the second light source according to the corresponding relationship between the currents of the first light source and the second light source, so that the color coordinates of the synthesized white light are kept in advance. Within the range, that is, when the current of the first power source changes, the control circuit changes the current of the second power source accordingly, so that the color coordinates of the finally synthesized white light of the light source module are kept within a preset range, that is, the DCI is satisfied. The standard range.

Another embodiment of the present invention provides a light source module, which is the same as the light source module provided in the above embodiment, and is different in the first light source in this embodiment. 10 includes a plurality of first light emitting devices, and the second light source 11 includes a plurality of second light emitting devices, and the light source control circuit 12 controls the opening of the first light emitting device according to a current correspondence relationship between the first light source and the second light source that are established in advance. The number and the number of opening of the second light emitting device to control the light intensity of the first excitation light by controlling the number of opening of the first light emitting device, and controlling the light of the second excitation light by controlling the number of opening of the second light emitting device Strong.

When the current of the first light source 10 changes, such as when changing from 2.5A to 1.3A, the intensity of the first excitation light also changes. At this time, the light source control circuit 12 according to the first light source shown in Table 1. 10 and the current relationship of the second light source 11, adjusting the number of opening of the second light emitting device, to adjust the total output current of the second light source 11 to 1.9A, thereby adjusting the light intensity of the second excitation light; When the current of the second light source 11 changes, such as when changing from 2.16A to 1.50A, the intensity of the second laser light is also changed. At this time, the light source control circuit 12 according to the first light source 10 shown in Table 1 The current corresponding relationship of the second light source 11 controls the number of turns of the first light emitting device to adjust the total output current of the first light source 10 to 0.9A, thereby adjusting the light intensity of the first excitation light, so that the light intensity is changed. The color coordinates of the first excitation light, the second excitation light, the first laser beam, and the second laser-combined white light are maintained within a standard range.

In this embodiment, the total output current of the first light source 10 is changed by changing the number of turns of the first light emitting device, and the total output current of the second light source 11 is changed by changing the number of turns of the second light emitting device. After the total output current of a light source 10 is changed, the intensity of the first excitation light and the first acceptance The intensity of the laser light also changes. After the total output current of the second light source 11 changes, the intensity of the second excitation light and the intensity of the second received laser light also change, that is, the intensity and color of the synthesized white light. The domain and color coordinates will also change, so that it is no longer necessary to replace the light source module to meet the different white light requirements of the user, saving the replacement cost and making the adjustment process easier and easier to operate. Moreover, in the embodiment, the manner of controlling the intensity of the excitation light by controlling the number of light-emitting devices to be turned on is more simple and easy to operate.

In the light source module provided by the embodiment, the light source control circuit controls the number of opening of the first light emitting device in the first light source and the second light emitting device in the second light source according to the correspondence between the currents of the first light source and the second light source established in advance. The number of opening is such that the color coordinate of the synthesized white light is kept within a preset range, that is, when the current of the first power source changes, the control circuit changes the number of opening of the second light emitting device correspondingly, so that The color coordinates of the white light finally synthesized by the light source module are kept within a preset range, that is, the standard range of the DCI is satisfied.

A further embodiment of the present invention further provides a light source control method for a light source module, the light source control method being applied to the light source module provided by any of the above embodiments, the control method comprising:

Controlling, according to a pre-established current correspondence between the first light source and the second light source, a light intensity of the first excitation light emitted by the first light source and a second excitation light emitted by the second light source to excite the first excitation light The color coordinates of the first laser light, the second laser light excited by the second excitation light, and the white light synthesized by the second excitation light are kept within a preset range.

In this embodiment, the light intensity of the first excitation light can be changed by changing the current of the first light source 10, and the light intensity of the second excitation light can be changed by changing the current of the second light source 11. That is, the process of controlling the light intensity of the first excitation light emitted by the first light source and the light intensity of the second excitation light emitted by the second light source according to the current correspondence relationship between the first light source and the second light source, which are established in advance, includes:

Specifically, the process of establishing the correspondence between the currents of the first light source and the second light source includes:

The corresponding relationship between the currents of the first light source and the second light source, that is, the current value I1′ of the second power source corresponds to the current value I1 of the first power source, and the current value I2′ of the second power source corresponds to the current value I2 of the first power source. And so on, the current value In' of the second power source corresponds to the current value In of the first power source.

When the current value of the first power source becomes I3, it is only necessary to adjust the current value of the second light source to I3' by the light source control circuit to ensure that the color coordinates of the white light emitted by the light source module meet the DCI standard within a preset range. range.

In another embodiment, the light intensity of the first excitation light may be changed by changing the number of opening of the first light emitting device in the first light source, and the number of the second light emitting device in the second light source is changed by changing the number of the second light emitting device. The intensity of the two excitation lights. Specifically, when the first light source includes a plurality of first light emitting devices, and the second light source includes a plurality of second light emitting devices, controlling the first light source to emit according to a pre-established current correspondence relationship between the first light source and the second light source The process of the intensity of the first excitation light and the intensity of the second excitation light emitted by the second light source includes:

Controlling the number of opening of the first light emitting device and the number of opening of the second light emitting device according to a pre-established current correspondence relationship between the first light source and the second light source to control the number of opening of the first light emitting device To control the light intensity of the first excitation light, and control the light intensity of the second excitation light by controlling the number of the second light emitting device to be turned on.

In the light source control method of the light source module provided by the embodiment, the light source control circuit controls the light intensity of the first excitation light and the light intensity of the second excitation light according to the current correspondence between the first light source and the second light source. The color coordinates of the first laser light, the second laser light, the unabsorbed first excitation light, and the unabsorbed second excitation light are maintained within a predetermined range, that is, the light of the first excitation light When the change is strong, the light source control circuit is based on the pre-established first light source and second light. The current correspondence of the source correspondingly changes the light intensity of the second excitation light, so that the color coordinate of the white light finally synthesized by the light source module is kept within a preset range, that is, the standard range of the DCI is satisfied;

Moreover, in this embodiment, the light intensity, the color gamut, and the color coordinates of the synthesized white light can be adjusted by adjusting the light intensity of the first excitation light and the second excitation light, thereby avoiding the light source mode in the prior art to meet different needs of the user. The operation caused by the replacement of the group is complicated and the cost is high.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A light source module, comprising:

a first light source that emits a first excitation light;

a second light source that emits a second excitation light;

a color wheel having at least one wavelength converting material, the wavelength converting material absorbing the first excitation light to generate a first laser beam, and absorbing the second excitation light to generate a second laser beam;

a light source control circuit connected to the first light source and the second light source, wherein the light source control circuit is configured to control the light intensity of the first excitation light according to a pre-established current correspondence relationship between the first light source and the second light source And a light intensity of the second excitation light to maintain color coordinates of the white light synthesized by the first laser light, the second laser light, the unabsorbed first excitation light, and the unabsorbed second excitation light Within the preset range.
The light source module according to claim 1, wherein the light source control circuit controls the current of the first light source and the second light source according to a current correspondence relationship between the first light source and the second light source which are established in advance And a current to control a light intensity of the first excitation light by controlling a current of the first light source, and controlling a light intensity of the second excitation light by controlling a current of the second light source.
The light source module according to claim 2, wherein said light source control circuit controls currents of said first light source and said second light source by pulse width modulation.
The light source module according to claim 1, wherein the first light source comprises a plurality of first light emitting devices, and the second light source comprises a plurality of second light emitting devices;

The light source control circuit controls the number of opening of the first light emitting device and the number of opening of the second light emitting device according to a current correspondence relationship between the first light source and the second light source, which are established in advance, by controlling the first light emitting The number of the devices is turned on to control the light intensity of the first excitation light, and the light intensity of the second excitation light is controlled by controlling the number of the second light emitting devices to be turned on.
The light source module according to any one of claims 1 to 4, wherein the first excitation light and the second excitation light are blue light, and the first laser light and the second laser light are yellow light;

Alternatively, the first excitation light and the second excitation light are blue light, and the first received laser light and the second received laser light are mixed light of red light and green light.
The light source module according to claim 5, wherein the first excitation light is blue light having a wavelength of 440 nm to 455 nm, and the second excitation light is blue light having a wavelength of 465 nm.
A projection system comprising the light source module according to any one of claims 1 to 6.
A light source control method for a light source module, comprising the light source module according to any one of claims 1 to 6, wherein the light source control method comprises:

Controlling, according to a pre-established current correspondence between the first light source and the second light source, a light intensity of the first excitation light emitted by the first light source and a light intensity of the second excitation light emitted by the second light source, so that the first excitation light The color coordinates of the first laser light that is excited, the second laser light that is excited by the second excitation light, and the white light that is not absorbed by the first excitation light and the second excitation light are kept within a preset range.
The method according to claim 8, wherein the controlling the light intensity of the first excitation light emitted by the first light source and the second light source emission according to a current correspondence relationship between the first light source and the second light source established in advance The process of the intensity of the two excitation lights includes:

Controlling a current of the first light source and a current of the second light source according to a pre-established current correspondence relationship between the first light source and the second light source to control the first excitation light by controlling a current of the first light source The light intensity is controlled by controlling the current of the second light source to control the intensity of the second excitation light.
The method according to claim 8, wherein when the first light source comprises a plurality of first light emitting devices, and the second light source comprises a plurality of second light emitting devices, the first light source and the first The process of controlling the current intensity of the first light source and the light intensity of the second excitation light emitted by the second light source according to the current correspondence of the two light sources includes:

Controlling the number of opening of the first light emitting device and the number of opening of the second light emitting device according to a pre-established current correspondence relationship between the first light source and the second light source to control the number of opening of the first light emitting device To control the light intensity of the first excitation light, and control the light intensity of the second excitation light by controlling the number of the second light emitting device to be turned on.