Light source system and laser projection device

Abstract

The present application relates to the technical field of photoelectricity. Provided are a light source system and a laser projection device. The light source system comprises a display control module, a laser drive module and a laser device module, wherein the laser device module comprises at least one laser device; a drive signal output end of the display control module is connected to a drive signal receiving end of the laser drive module; an enable signal output end of the display control module is connected to an enable signal receiving end of the laser drive module; and a drive current output end of the laser drive module is connected to the laser device. The light source system provided in the present application can reduce the number of devices needing to be deployed in the light source system and can reduce a space occupied by the light source system, thereby improving the miniaturization and integration of the light source system.

Description

Light source system and laser projection equipment

[0001] This application claims priority to Chinese patent application No. 202311006491.6, filed on August 10, 2023, with application name “Laser projection equipment”, and priority to Chinese patent application No. 202311840869.2, filed on December 28, 2023, with application name “Laser projection equipment”, and priority to Chinese patent application No. 202311840981.6, filed on December 28, 2023, with application name “Laser projection equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optoelectronic technology, and in particular to a light source system and a laser projection device. Background Art

[0003] With the development of projection technology, the application of laser projection equipment such as projectors and laser TVs is becoming more and more common.

[0004] However, the laser projection device in the related art requires deployment of many components, resulting in the laser projection device occupying a large space.

[0005] Public content

[0006] Embodiments of the present application provide a light source system and a laser projection device.

[0007] In one aspect, an embodiment of the present application provides a light source system, comprising: a display control module, a laser driving module, and a laser module; the laser module comprises at least one laser;

[0008] The driving signal output terminal of the display control module is connected to the driving signal receiving terminal of the laser driving module, the enable signal output terminal of the display control module is connected to the enable signal receiving terminal of the laser driving module, and the driving current output terminal of the laser driving module is connected to the at least one laser;

[0009] The display control module is configured to determine at least one laser drive signal and output the at least one laser drive signal and at least one first enable signal to the laser drive module; the laser drive signal is configured to represent the magnitude of the drive current corresponding to the target color displayed by the at least one laser;

[0010] The laser driving module is used to respond to the at least one first enable signal, adjust the driving current according to the at least one laser driving signal, and output the adjusted driving current to the at least one laser to light up the at least one laser.

[0011] On the other hand, an embodiment of the present application provides a laser projection device, wherein the laser projection device includes the light source system described in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation methods in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0013] FIG1 is a schematic structural diagram of a laser projection device provided in an embodiment of the present application;

[0014] FIG2 is a schematic diagram of an image display of a laser projection device provided in an embodiment of the present application;

[0015] FIG3 is a schematic diagram of a circuit structure of a light source system provided by the related art;

[0016] FIG4 is a signal timing diagram of a light source system provided by the related art;

[0017] FIG5 is a schematic structural diagram of a light source system provided in an embodiment of the present application;

[0018] FIG6 is a schematic structural diagram of another light source system provided in an embodiment of the present application;

[0019] FIG7 is a timing diagram of a driving signal of a light source system provided in the related art;

[0020] FIG8 is a schematic structural diagram of another light source system provided in an embodiment of the present application;

[0021] FIG9 is a schematic diagram of a circuit structure of a feedback compensation component provided in an embodiment of the present application;

[0022] FIG10 is a schematic diagram of a circuit structure of a filtering unit provided in an embodiment of the present application;

[0023] FIG11 is a schematic diagram of a circuit structure of a light source system provided in an embodiment of the present application;

[0024] FIG12 is a schematic diagram of the circuit structure of another light source system provided in an embodiment of the present application;

[0025] FIG13 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0026] FIG14 is a timing diagram of a laser feedback signal and a driving current provided in an embodiment of the present application;

[0027] FIG15 is a schematic diagram of a circuit structure of a parallel laser provided by the related art;

[0028] FIG16 is a schematic diagram of a circuit structure of a common cathode laser provided by the related art;

[0029] FIG17 is a schematic diagram of a circuit structure of a common anode laser provided by the related art;

[0030] FIG18 is a schematic diagram of a circuit structure of common anode lasers in parallel provided by the related art;

[0031] FIG19 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0032] FIG20 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0033] FIG21 is a timing diagram of an enable signal, a PWM signal, and a current provided in an embodiment of the present application;

[0034] FIG22 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0035] FIG23 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0036] FIG24 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0037] FIG25 is a schematic diagram of a circuit structure of multiple common cathode three-color lasers connected in series according to an embodiment of the present application;

[0038] FIG26 is a schematic diagram of a circuit structure of multiple common anode three-color lasers connected in series according to an embodiment of the present application;

[0039] FIG27 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0040] FIG28 is a schematic diagram of a partial circuit structure for driving a red sub-laser provided in an embodiment of the present application;

[0041] FIG29 is a schematic diagram of a partial circuit structure of another embodiment of the present application for driving a red sub-laser;

[0042] FIG30 is a schematic diagram of a partial circuit structure of another embodiment of the present application for driving a red sub-laser;

[0043] FIG31 is a flow chart of a light source system control method provided in an embodiment of the present application;

[0044] FIG32 is a schematic diagram of a circuit structure of a three-color laser provided by the related art;

[0045] FIG33 is a schematic diagram of a circuit structure of a light source system provided by the related art;

[0046] FIG34 is a schematic diagram of the circuit structure of another light source system provided in an embodiment of the present application;

[0047] FIG35 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0048] FIG36 is a schematic diagram of the circuit structure of another light source system provided in an embodiment of the present application;

[0049] FIG37 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0050] FIG38 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0051] FIG39 is a schematic diagram of a circuit structure of another light source system provided in an embodiment of the present application;

[0052] FIG40 is a schematic structural diagram of a current adjustment unit provided in an embodiment of the present application;

[0053] FIG41 is a schematic structural diagram of another current adjustment unit provided in an embodiment of the present application;

[0054] FIG42 is a schematic structural diagram of another light source system provided in an embodiment of the present application;

[0055] FIG43 is a schematic structural diagram of another light source system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the exemplary embodiments of the present application.

[0057] FIG1 is a schematic diagram of the structure of a laser projection device provided in an embodiment of the present application, and FIG2 is a schematic diagram of the image display of the laser projection device provided in an embodiment of the present application. As shown in FIG1 and FIG2, in some embodiments, after the upper shell of the laser projection device is disassembled, the internal structure is divided according to the optical function, and may include a light source system 100, an optical machine system 200 (also known as an optical machine, an optical modulator) and a lens system 300 (or a projection lens, a lens). Among them, the light source system 100 is used to provide a light source illumination beam, which is transmitted to the back-end optical machine system 200 and the lens system 300. The lens system 300 projects the modulated laser beam onto the projection screen 400, thereby realizing image display. The light source system 100 may include a laser of at least one color, such as a blue laser, or a two-color laser, such as a blue laser and a red laser, or a three-color laser light source, including lasers of three colors: red, green and blue, for providing a three-color laser illumination beam.

[0058] The laser beam provided by the light source system 100 undergoes light combining and shaping before entering the illumination optical path of the optical engine system 200. In the digital light processing (DLP) projection architecture, the digital micro-mirror device (DMD) chip is the core optical modulation device. The DMD chip receives a drive control signal corresponding to the image signal and flips the thousands of tiny mirrors on its surface to a positive or negative angle corresponding to the drive signal, reflecting the light beam that impinges on its surface into the lens system 300. The lens system 300 may be an ultra-short-throw projection lens, which is used to project the image beam onto a projection screen, thereby displaying the projected image. The laser projection device in the above example may be an ultra-short-throw laser projection device. As mentioned above, the light source system 100 of the laser projection device may include at least one color laser. For example, if the light source system 100 includes a single color laser, the laser may also be referred to as a monochromatic laser. Monochromatic lasers are widely used due to their advantages such as strong light resistance, strong color expression, and clear and transparent images.

[0059] Taking a blue laser as an example, the monochromatic laser's light source can consist of a blue laser, a phosphor wheel, and a color filter wheel. The blue laser emits blue light that hits the phosphor wheel, stimulating broad-spectrum fluorescence. This light is then filtered by the color filter wheel to produce red and blue light. The blue light is then projected through the transmission area of ​​the color filter wheel, producing the three primary colors of red, green, and blue. When a laser projection device displays an image, the brightness differences between the three colors of red, green, and blue can be adjusted by the blue laser as the phosphor wheel and color filter wheel rotate to different colors. The laser's brightness is determined by the magnitude of the drive current input to the laser. Therefore, a highly accurate and responsive laser drive solution is crucial.

[0060] Figure 3 is a schematic diagram of the structure of a light source system provided by the related art. As shown in Figure 3, the light source system may include a display control circuit, a digital-to-analog conversion circuit, a selector switch, a laser driver circuit, and a laser. The display control circuit is configured to convert the input video signal format and output the converted signal to the DMD. Furthermore, the display control circuit can output signals to control the rotation and synchronization of the color filter wheel and phosphor wheel, while generating PWM control signals for the current values ​​of the red, green, blue, and yellow colors based on the frame synchronization signal. The duty cycle of the PWM control signal can represent the current magnitude. For example, a duty cycle of 100% represents the maximum current value. Based on the light source system shown in Figure 3, Figure 4 is a signal timing diagram of a light source system provided by the related art. As shown in Figures 3 and 4, the Y_PWM, R_PWM, G_PWM, and B_PWM signals represent the current values ​​for yellow, red, green, and blue, respectively, represented by the PWM signals.

[0061] Because laser driver circuits often use analog dimming, the PWM signal output by the display control circuit can be converted into an analog signal via a digital-to-analog conversion circuit. As shown in Figures 3 and 4, the Y_ANG, R_ANG, G_ANG, and B_ANG signals represent the analog signals converted from the PWM signals for different color currents. A selector switch combines the four analog dimming signals output by the digital-to-analog conversion into a single laser drive signal (shown as the LD_ANG_OUT signal in Figures 3 and 4) for input to the laser driver circuit. The EN_R, EN_G, and EN_B inputs to the selector switch from the display control circuit select the analog dimming signals for red, green, and blue, respectively. The analog dimming scheme of the laser driver circuit outputs a corresponding drive current based on the voltage received by the ADJ pin of the laser driver chip. The laser driver circuit can adjust the output drive current using either a buck or boost topology to achieve brightness adjustment. As shown in Figure 4, LD_CURRENT refers to the drive current flowing through the laser.

[0062] The main problems with the above solution include: the need to deploy a dedicated PWM-to-analog chip (that is, the above-mentioned digital-to-analog conversion circuit) in the light source system, which is not conducive to the miniaturization and integration of the board; the PWM-to-analog chip will have a delay in responding to changes in the duty cycle of the PWM signal, resulting in a delay in current adjustment, which is not conducive to brightness adjustment in high dynamic or low dynamic modes.

[0063] Considering the aforementioned issues with existing laser projection devices, the present application proposes a light source system that does not require the deployment of an additional digital-to-analog conversion circuit, but instead controls the laser drive circuit via a display control circuit. In the laser projection device provided by the present application, the deployment of a digital-to-analog conversion circuit is unnecessary, which reduces the number of components required in the light source system, reduces the space occupied by the light source system, and improves the miniaturization and integration of the light source system. Furthermore, by eliminating the digital-to-analog conversion circuit, the delay in current adjustment is reduced.

[0064] The following detailed description of the technical solution of the present application is provided in conjunction with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0065] FIG5 is a schematic diagram of the structure of a light source system provided by the present application. As shown in FIG5 , in some embodiments, the light source system may include: a display control module 701 , a laser driving module 702 , and a laser module 703 , wherein the laser module 703 includes at least one laser. The drive signal output terminal 701a of the display control module 701 is connected to the drive signal receiving terminal 702a of the laser drive module 702, the enable signal output terminal 701b of the display control module 701 is connected to the enable signal receiving terminal 702b of the laser drive module 702, and the drive current output terminal 702c of the laser drive module 702 is connected to at least one laser; the display control module 701 is used to determine at least one laser drive signal and output at least one laser drive signal and at least one first enable signal to the laser drive module 702; the laser drive signal is used to represent the size of the drive current corresponding to the target color displayed by at least one laser; the laser drive module 702 is used to respond to at least one first enable signal, adjust the drive current size according to at least one laser drive signal, and output the adjusted drive current to at least one laser to light up at least one laser.

[0066] The drive signal output terminal 701a of the display control module 701 is used to output a laser drive signal for controlling laser dimming, and may also be referred to as a dimming signal output terminal. The laser drive module 702 may also be referred to as a laser drive module, the drive signal receiving terminal 702a of the laser drive module 702 may also be referred to as a first terminal of the laser drive module 702, the enable signal receiving terminal 702b of the laser drive module 702 may also be referred to as a second terminal of the laser drive module 702, and the drive current output terminal 702c of the laser drive module 702 may also be referred to as a third terminal of the laser drive module 702.

[0067] In this embodiment, the display control module 701 outputs at least one laser drive signal to the laser drive module 702, so that the laser drive module 702 can control the illumination of the laser based on the laser drive signal and the first enable signal. This method eliminates the need for an additional digital-to-analog conversion chip in the light source system, thereby reducing the number of components required in the light source system and the space occupied by the light source system, thereby improving the miniaturization and integration of the laser projection device. Furthermore, by eliminating the digital-to-analog conversion circuit, the delay in current adjustment is reduced.

[0068] In some embodiments, the display control module 701 may include, for example, a display control unit 7011 and a selection switch unit 7012. Alternatively, the display control module 701 may not include the selection switch unit 7012 to further reduce the number of components in the light source system. Taking the example where the display control module 701 does not include the selection switch unit 7012, the function of the selection switch may be integrated into the display control unit 7011 of the display control module 701. The laser driving module 702 may include, for example, a constant current integrated circuit (IC), a current adjustment circuit, and the like. The laser may be, for example, a monochromatic laser. It should be understood that the present application does not limit the color of the monochromatic laser.

[0069] In some embodiments, the display control module 701 may be configured to determine multiple dimming analog signals based on a video signal to be displayed. The display control module 701 may then determine a laser driving signal based on the multiple dimming analog signals and output the laser driving signal and the first enable signal to the laser driving module 702.

[0070] The dimming analog signal is used to characterize the magnitude of the driving current corresponding to the corresponding color displayed by the laser. For example, the dimming analog signal may be the aforementioned PWM signal. Taking the dimming analog signal as a PWM signal as an example, the different duty cycles of the PWM signal may be used to characterize the magnitude of the driving current corresponding to the corresponding color displayed by the laser. The number of the multi-channel dimming analog signal may be the same as the color that the laser can display. For example, the multi-channel dimming analog signal may be the aforementioned Y_PWM, R_PWM, G_PWM, B_PWM, etc.

[0071] Optionally, after obtaining the multiple dimming analog signals, the display control module 701 may synthesize the multiple dimming analog signals to obtain the at least one laser drive signal. Optionally, the display control module 701 may synthesize the multiple dimming analog signals into the at least one laser drive signal in accordance with the functions of the digital-to-analog conversion circuit and the selection switch described in the previous embodiment, and will not be further described here. In some embodiments, the display control module 701 may integrate the digital-to-analog conversion function and the selection switch function, for example.

[0072] The laser driver module 702 can be configured to respond to the first enable signal, adjust the drive current according to the laser drive signal, and output the adjusted drive current to the laser to illuminate the laser. In some embodiments, the laser driver module 702 can, for example, determine the color to be displayed by the laser based on the first enable signal, and then, based on the laser drive signal corresponding to the color, determine the drive current corresponding to the laser displaying the color, and adjust the drive current input to the laser so that the laser displays the color with the brightness corresponding to the drive current.

[0073] In this embodiment, the display control module 701 synthesizes multiple dimming analog signals into a single laser drive signal and outputs it to the laser drive module 702, so that the laser drive module 702 can control the laser lighting based on the single laser drive signal and the first enable signal. This method eliminates the need for an additional digital-to-analog conversion chip in the light source system, thereby reducing the number of components required in the light source system and the space occupied by the light source system, thereby improving the miniaturization and integration of the laser projection device. Furthermore, by eliminating the digital-to-analog conversion circuit, the current adjustment delay is reduced.

[0074] As mentioned above, the display control module 701 may include a display control unit 7011 and a selection switch unit 7012, or the display control module 701 may not include the selection switch unit 7012. Taking the above-mentioned display control module 701 including the display control unit 7011 and the selection switch unit as an example, Figure 6 is a structural schematic diagram of another light source system provided by an embodiment of the present application. As shown in Figure 6, in some embodiments, the first signal output terminal 7011a of the display control unit 7011 can be connected to the first signal input terminal 7012a of the selection switch unit 7012. The enable signal output terminal 7011b of the display control unit 7011 can be connected to the enable signal input terminal 7012b of the selection switch unit 7012 and the enable signal receiving terminal 702b of the laser driving module 702. The selection signal output terminal 7012c of the selection switch unit 7012 can be connected to the drive signal receiving terminal 702a of the laser driving module 702.

[0075] In some embodiments, the display control unit 7011 may be, for example, the aforementioned DLP, or a system on chip (SOC), or a field programmable gate array (FPGA), etc., which is not limited in this application.

[0076] In this implementation, the display control unit 7011 can determine multiple dimming signals based on the video signal to be displayed, and output the multiple dimming signals and a third enable signal to the selection switch unit. The selection switch unit can respond to the third enable signal and synthesize the multiple dimming signals to obtain a laser driving signal.

[0077] In some embodiments, when the laser module 703 includes a single laser, the display control unit 7011 may, for example, first determine multiple dimming PWM signals (digital signals) based on the video signal to be displayed, and then convert the PWM signals into analog signals using a digital-to-analog conversion function integrated in the display control unit 7011 to obtain multiple dimming analog signals. The third enable signal is used to instruct the selection switch unit 7012 to select the multiple dimming analog signals and synthesize the multiple dimming analog signals to obtain a laser drive signal.

[0078] In some embodiments, the display control unit 7011 does not integrate a digital-to-analog conversion function, but rather the digital-to-analog conversion function is integrated within the laser driver module 702. For example, the display control unit 7011 can first determine multiple dimming PWM signals based on the video signal to be displayed, and then convert the PWM signals into analog signals using the digital-to-analog conversion function integrated within the display control unit to obtain multiple dimming analog signals. The third enable signal is used to instruct the selection switch unit 7012 to select the multiple dimming PWM signals and synthesize the multiple dimming PWM signals to obtain a laser driving signal. The laser driver module 702 then performs digital-to-analog conversion on the laser driving signal for use in adjusting the driving current.

[0079] Through the above method, the light source system can obtain the laser driving signal through the display control unit 7011 and the selection switch unit 7012, showing that there is no need for a digital-to-analog conversion module to determine the laser driving signal, thereby realizing the miniaturization of the light source system.

[0080] Considering the possibility of abnormal laser drive signals in the aforementioned light source system, Figure 7 shows a schematic diagram illustrating an abnormal signal generated in a laser drive signal according to related art. As shown in Figure 7, R_PWM, G_PWM, and B_PWM represent the analog dimming signals corresponding to the laser displaying red, green, and blue, respectively; EN_R, EN_G, and EN_B represent the second enable signals for the analog dimming signals corresponding to red, green, and blue, respectively. LD_PWM_OUT represents the aforementioned laser drive signal. As shown in Figure 7, the synthesized laser drive signal may exhibit anomalies such as inconsistent and irregular cycle lengths. This anomaly is primarily due to the mismatch between the frequencies of the three-color analog dimming signals and the frequency of the second enable signal, leading to anomalies during synthesis. For example, in the first cycle of Figure 7, at the end of EN_R's high level, R_PWM is low, and immediately following the beginning of EN_G's high level, G_PWM is high. The time difference between these periods is small, resulting in a significant periodic anomaly in LD_PWM_OUT. Similarly, as shown in the second and third circles in Figure 7, the cycles within these circles are abnormally long. However, laser driver module 702 has the function of adjusting the current on a cycle-by-cycle basis. That is, when the input current has different cycles, it outputs different currents to adjust the laser brightness in this way. Therefore, an abnormality in the LD_PWM_OUT cycle can lead to abnormal regulation of the drive current, such as an unexpected increase in laser brightness, which means that there may be a problem of poor brightness change stability.

[0081] Taking into account the possible problems mentioned above, in some embodiments, the above-mentioned laser projection device may further include a feedback compensation module 704 to filter abnormal signals in the above-mentioned laser drive signal. For example, Figure 8 is a structural schematic diagram of another light source system provided in an embodiment of the present application. As shown in Figure 8, in some embodiments, the above-mentioned light source system may further include: a feedback compensation module 704. As shown in Figure 8, the first end of the feedback compensation module 704 can be connected to at least one laser (for example, the current output end of the laser, that is, the negative pole of the laser). The second end of the feedback compensation module 704 can be connected to the laser drive module 702 (for example, the feedback signal detection end 702d of the laser drive module 702). The feedback signal detection end 702d of the laser drive module 702 can also be referred to as the fourth end of the laser drive module 702.

[0082] The feedback compensation module 704 can be used to filter the driving current corresponding to the abnormal signal in the laser driving signal to obtain a laser feedback signal, and output the laser feedback signal to the laser driving module 702. The laser driving module 702 can be used to adjust the driving current according to the laser feedback signal and the laser driving signal.

[0083] Optionally, the laser feedback signal may be a voltage signal or a current signal, which is not limited in this application. Taking the laser feedback signal as a voltage signal as an example, the feedback compensation module 704 may, for example, convert the driving current corresponding to the laser driving signal into a voltage, and filter the voltage obtained by converting the driving current corresponding to the abnormal signal in the laser driving signal to obtain the laser feedback signal.

[0084] It should be understood that the laser driving module 702 adjusts the driving current according to the above-mentioned laser feedback signal and the laser driving signal, for example, by referring to any existing current adjustment method, and this application is not limited thereto. For example, taking the above-mentioned laser feedback signal as a voltage signal as an example, the laser driving module 702 can compare the current corresponding to the above-mentioned laser feedback signal with the driving current input to the laser. If the current corresponding to the laser feedback signal is too small, the laser driving module 702 can increase the driving current corresponding to the above-mentioned laser driving signal and input it to the laser to improve the accuracy of the brightness control of the laser. If the current corresponding to the laser feedback signal is too large, the laser driving module 702 can decrease the driving current corresponding to the above-mentioned laser driving signal and input it to the laser to improve the accuracy of the brightness control of the laser. If the current corresponding to the laser feedback signal is equal to the driving current input to the laser, it means that the accuracy of the driving current is high, and the laser driving module 702 does not need to adjust the driving current.

[0085] In this embodiment, the light source system can filter the driving current corresponding to the abnormal signal in the laser driving signal through the above-mentioned feedback compensation module 704, thereby improving the stability of the laser feedback signal fed back by the laser to the laser driving module 702, and further improving the stability of the laser driving module 702 adjusting the subsequent driving current input to the laser based on the laser feedback signal, thereby also improving the safety and service life of the laser.

[0086] The structure of the feedback compensation module is described below as follows:

[0087] Figure 9 is a structural diagram of a feedback compensation module provided in an embodiment of the present application. As shown in Figure 9, in some embodiments, the feedback compensation module 704 may include: a filtering unit 7041, and an amplifying unit 7042. As shown in Figure 7, for example, the first end of the amplifying unit 7042 can be connected to at least one laser (for example, the current output end of the laser), and the second end of the amplifying unit 7042 can be connected to the first end of the filtering unit 7041 and the laser driving module 702 (for example, the feedback signal detection end 702d of the laser driving module 702). The second end of the filtering unit 7041 can be grounded. The amplifying unit 7042 can be used to convert the driving current flowing through at least one laser into a voltage signal and amplify it, and the amplified voltage signal is output to the filtering unit 7041.

[0088] For example, the amplification unit 7042 may include an amplifier. Optionally, the amplifier may be an error amplifier or an operational amplifier, which is not limited in this application.

[0089] In some embodiments, the amplification unit 7042 may include a transconductance amplifier. This transconductance amplifier may be a transconductance operational amplifier or a transconductance error amplifier. For example, if the amplification unit 7042 includes a transconductance amplifier, the first end of the transconductance amplifier may be connected to the current output terminal of at least one laser (or the cathode of at least one laser). The second end of the transconductance amplifier may be connected to the first end of the filtering unit 7041 and the feedback signal detection terminal 702d of the laser driver module 702. Through the above method, the amplification unit 7042 can convert the driving current flowing through the at least one laser into a voltage signal and amplify it, laying the foundation for subsequent filtering of abnormal currents using the amplified voltage. Alternatively, the amplification unit 7042 may also include, for example, other types of components capable of converting current signals into voltage signals, as well as amplifiers for amplifying voltage signals, although this application is not limited thereto. The filtering unit 7041 can be used to filter the driving current corresponding to the abnormal signal based on the amplified voltage signal to obtain a laser feedback signal.

[0090] Figure 10 is a schematic diagram of the structure of a filtering unit provided in an embodiment of the present application. As shown in Figure 10, in some embodiments, the filtering unit 7041 may include a first filtering subunit 70411 and a second filtering subunit 70412. The first end of the first filtering subunit 70411, the first end of the second filtering subunit 70412, and the second end of the amplification unit 7042 are all connected to the feedback signal detection terminal 702d of the laser driving module 702. The second end of the first filtering subunit 70411 and the second end of the second filtering subunit 70412 may both be grounded.

[0091] The first filter subunit 70411 can be used to filter the drive current corresponding to abnormal signals with a frequency less than or equal to the first frequency. The second filter subunit 70412 can be used to filter the drive current corresponding to abnormal signals with a frequency greater than the first frequency and less than or equal to the second frequency. Through the first filter subunit 70411 and the second filter subunit 70412, the light source system can filter out laser drive signals with a frequency less than or equal to the second frequency as abnormal signals, thereby filtering out the drive current corresponding to laser drive signals with frequencies that are too low.

[0092] In some embodiments, the frequency of the dimming analog signal may be greater than twice the second frequency. By making the frequency of the dimming analog signal greater than twice the second frequency, the display control module ensures that normal dimming analog signals are not filtered out, and ensures that the laser feedback signal corresponding to the normal driving current flowing through the laser can be returned to the laser driver module 702, thereby implementing a complete laser lighting control process.

[0093] As shown in FIG13 , in some embodiments, the first filtering subunit 70411 may include: a first resistor R1, and a first capacitor C1. The first end of the first resistor R1 may be connected to the feedback signal detection terminal 702d of the laser driving module 702 (that is, also connected to the second end of the amplification unit 7042). The second end of the first resistor R1 may be grounded via the first capacitor C1. Optionally, the first filtering subunit 70411 may filter the driving current corresponding to the abnormal signal having a frequency less than or equal to the first frequency, for example, through the charging and discharging process of the first resistor R1 and the first capacitor C1.

[0094] In some embodiments, the second filtering subunit 70412 may include, for example, a second capacitor C2. A first end of the second capacitor C2 may be connected to the feedback signal detection terminal 702d of the laser driving module 702 (i.e., also connected to the second end of the amplification unit 7042). A second end of the second capacitor C2 may be grounded. Optionally, the first filtering subunit 70411 may filter the driving current corresponding to the abnormal signal having a frequency lower than the second frequency, for example, by charging and discharging the second capacitor C2.

[0095] In some embodiments, the first frequency and the second frequency may be related to, for example, the resistance of the first resistor R1, the transconductance coefficient of the transconductance amplifier, and the capacitance of the first capacitor C1. Alternatively, the first frequency and the second frequency may be related to, for example, the resistance of the first resistor R1, the transconductance coefficient of the transconductance amplifier, the capacitance of the first capacitor C1, and the capacitance of the second capacitor C2, etc., which is not limited in this application.

[0096] For example, taking the above-mentioned display control module 701 including a display control unit 7011 and a selection switch unit 7012 as an example, FIG11 is a structural schematic diagram of another light source system provided in an embodiment of the present application. Among them, the display control unit 7011 can be a display control circuit. The selection switch unit 7012 can be a selection switch as shown in FIG11. Among them, the laser driving module 702 can be the laser driving circuit mentioned above. The display control unit 7011 outputs a first enable signal to the laser driving module 702 through the DUTY pin. ADIM represents the receiving pin of the laser driving signal, that is, the driving signal receiving end 702a.

[0097] By integrating a PWM-to-analog function within the display control unit 7011 chip, the display control unit 7011 can generate PWM control signals for red, green, blue, and yellow colors based on the frame synchronization signal. The PWM-to-analog chip converts these PWM signals into dimming analog signals and outputs them to the selector switch. The selector switch can synthesize the four dimming analog signals output by the display control circuit into one laser drive signal, which is then input into the laser driver module 702.

[0098] The above solution uses the PWM to analog chip function integrated within the chip, rather than directly inputting it to the selection switch through PWM. This is because the output current of the analog drive method is continuous, while in the PWM solution, the laser is in the switching state, which can easily cause the piezoelectric effect of the ceramic capacitor in the circuit or generate an alternating magnetic field on the inductor, or cause the laser itself to vibrate, resulting in abnormal noise. Therefore, the light source system shown in Figure 11 can also achieve noise reduction through analog signals. In addition, because in PWM dimming, when the laser current is turned on, the switch and inductor always conduct the maximum current, resulting in increased conduction losses of the power switch and inductor, while the power loss of the analog signal is low, it can reduce the heat flow, thereby reducing the dependence on heat dissipation materials and further reducing the device space occupied.

[0099] By integrating the PWM-to-analog circuit into the driver IC of the display control unit 7011, it is not only conducive to the integration and miniaturization of the driver circuit, but also because the PWM sampling clock inside the chip is higher than the PWM input frequency, any change in the duty cycle can be responded to within a single PWM cycle, thereby further improving the efficiency of responding to duty cycle changes, thereby improving the accuracy of the brightness control of the light source system. In addition, through the light source system shown in Figure 11, the analog output reference voltage and the reference voltage of the driver IC (that is, the display control unit) are integrated into the same IC, achieving the use of the same reference source. Compared with the problem of inconsistent reference voltages in related technologies, which is prone to introducing noise, this application also improves the accuracy of output current regulation.

[0100] FIG12 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in FIG12 , the light source system may also not include the aforementioned selection switch. The meaning of each parameter in the light source system can be explained with reference to the parameters shown in the aforementioned embodiment, and will not be repeated here.

[0101] Taking the above into consideration, when the light source system shown in Figures 11 and 12 changes color, as mentioned above, due to the inconsistency between the frequency of the dimming analog signal and the frequency of the enable signal change, the synthesized laser drive signal cycle length may be inconsistent and irregular. As shown in Figure 13, the light source system may also include a feedback compensation module 704. Among them, the resistor Rsense can be the sampling resistor of the laser. The resistor R1 in the feedback compensation module 704 can be the aforementioned first resistor, the capacitor C1 can be the aforementioned first capacitor, and the capacitor C2 can be the aforementioned second capacitor. The transconductance amplifier N1 can be the aforementioned amplification unit 7042. Vref represents the reference voltage input terminal of the amplifier, and VCC represents the operating voltage pin of the amplifier. The other components in the circuit diagram can refer to the contents described in the above embodiment and will not be repeated here.

[0102] The following is an exemplary description of how to select the transconductance amplifier and how to determine the values ​​of the first capacitor C1, the second capacitor C2, and the first resistor R1:

[0103] Taking the feedback compensation module 704 (or referred to as feedback compensation circuit) in the light source system shown in FIG13 as an example, the transfer function of the feedback compensation circuit may be, for example, as shown in the following formula (1):

[0104] in, Ag = Rcomp * gm; where gm is the transconductance coefficient of the transconductance amplifier. Rcomp represents the resistance of the first resistor R1, Ccomp represents the capacitance of the first capacitor C1, and Chf represents the capacitance of the second capacitor C2. s may be a complex frequency domain variable used to represent the input signal of the feedback compensation circuit.

[0105] By selecting a transconductance error amplifier with an appropriate transconductance coefficient and adjusting the resistance value of the first resistor R1 and the capacitance value of the first capacitor C1, the loop bandwidth of the feedback compensation circuit can be adjusted to meet the rising edge time requirement of the laser drive signal output by the laser drive circuit (to ensure that the image is not affected and the image quality is not affected at low grayscale). For example, the loop bandwidth of the feedback compensation circuit can be shown as the following formula (2):

[0106] Among them, tres represents the maximum value of the rising edge time (10%-90%) of the laser driving signal. BW represents the loop bandwidth. For example, assuming that the above light source system is a laser TV that can achieve 4K 60Hz images, because the 4K image is modulated by 4 frames of 1080P images through a galvanometer, and the 1080P frame frequency is 240Hz, then according to the image quality requirements of high dynamic or low dynamic, the above tres is set to 20uS, then the loop bandwidth is: If the PWM dimming analog signal frequency sent by the SOC or DLP system is set to 2 times the bandwidth or above, the PWM dimming analog signal frequency can be set above 35KHz.

[0107] Through the feedback compensation module 704 as shown in Figure 13, Figure 14 is a timing diagram of the laser feedback signal and drive current provided in an embodiment of the present application. As shown in Figure 14, LD_PWM_OUT can be used to characterize the above-mentioned laser drive signal, and the circle is an abnormal signal in the laser drive signal. As shown in Figure 14, if the feedback compensation module 704 is not deployed in the light source system, the stability of the laser feedback signal FB and the laser drive current ILD are both poor when corresponding to the abnormal signal. If the feedback compensation module 704 is deployed in the light source system, the stability of the feedback signal FB (that is, the compensated FB) and the laser drive current ILD (that is, the compensated ILD) is improved.

[0108] In order to reduce the space occupied by the light source system, the volume of the light source system is getting smaller and smaller, and the laser therein is also miniaturized. One direction of miniaturization is to replace ordinary lasers with common cathode lasers or common anode lasers. Figure 15 is a circuit structure diagram of a parallel laser provided by the related art. As shown in Figure 15, the pins of the sub-lasers (or laser light sources) in the laser are independent of each other. Figure 16 is a circuit diagram of a common cathode laser provided by the related art. Figure 17 is a circuit diagram of a common anode laser provided by the related art. As shown in Figure 16, the lasers in the common cathode laser share a cathode pin. As shown in Figure 17, the lasers in the common anode laser share an anode pin. Therefore, the common cathode laser or common anode laser can save pin space and achieve laser miniaturization.

[0109] In related technologies, in order to improve the projection brightness of the light source system, multiple lasers are usually used. As for the connection method of multiple lasers, since the pins in the common cathode laser and the common anode laser are shared, it is difficult to connect them in series, and a parallel method is generally adopted; in addition, each sub-laser corresponding to each luminous color in each common cathode laser or common anode laser needs to be equipped with a control chip.

[0110] Figure 18 is a schematic diagram of a circuit structure for a common anode laser in parallel, as provided in the related art. As shown in Figure 18, the common anode laser parallel structure includes a power supply 1801, a display control component 1802, six constant current components 1803, and two common anode lasers 1804. Power supply 1801 supplies power to display control component 1802 and constant current components 1803. Display control component 1802 controls constant current components 1803 to output current to common anode laser 1804, causing common anode laser 1804 to illuminate. Separate constant current components 1803 output current to each of the red, green, and blue sub-lasers R, G, and B in the two common anode lasers 1804. Therefore, when lasers of the same color are illuminated simultaneously, the currents flowing through them will differ, resulting in differences in the brightness of the displayed image. Furthermore, since each sub-laser is equipped with a constant current component 1803, the number of constant current components 1803 is large, resulting in high cost, inconvenience in miniaturization, and significant co-magnetic interference.

[0111] In some embodiments, in the laser projection device shown in Figures 1 and 2, the light source system 100 can be a plurality of common cathode two-color lasers or a plurality of common anode two-color lasers, such as a blue laser and a red laser, or, it can also be a plurality of common cathode three-color lasers or a plurality of common anode three-color lasers, including lasers with three luminous colors of red, green, and blue, for providing a three-color laser illumination beam.

[0112] Figure 19 is a schematic diagram of the circuit structure of a light source system according to an embodiment of the present application. As shown in Figure 19, the light source system includes: a display panel 1901, a power supply board 1902, and a TV panel 1903. The power supply board 1902 is connected to the display panel 1901 and the TV panel 1903 respectively, and can be used to power various devices or partial modules on the display panel 1901 and the TV panel 1903. The TV panel 1903 is mainly used to decode external audio and video signals and output video image signals to the display panel 1901. The display panel 1901 can be provided with a field programmable gate array (FPGA) and an algorithm processing module 19011 for processing the input video image signals. The display control component 19012 is connected to the algorithm processing module 19011 and is used to receive the processed video image processing signal data as the image data to be displayed. The display panel 1901 is used to generate the initial drive signal for driving the laser and the image display drive signal for driving the light modulation device.

[0113] The display control component 19012 is used to generate an image display driving signal for driving the light modulator 19013 based on the image signal to be displayed. On the other hand, since the display of the projected image requires the synchronous cooperation of the light source beam and the light modulator, the display control component 19012 also generates a driving signal for driving the light source to emit light. The driving signal may include an initial image enable signal EN and an initial current control signal, such as a pulse width modulation (PWM) signal, wherein the initial image enable signal EN is a timing control signal used to coordinate the timing of the output of different luminous colors, and the PWM signal is a periodic square wave signal used to control the brightness of the laser.

[0114] Laser driver circuit 1904 is used to receive the image enable signal EN and PWM signal output by display control component 19012 and directly control the lighting of laser 1905. Signal shaping circuit 1906 can be used to generate a periodic sub-signal to shape the image enable signal EN or PWM signal, affecting the waveform and period of the signal ultimately output to laser 1905.

[0115] FIG20 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in FIG20 , in some embodiments, the laser module 703 includes at least two lasers, and the at least two lasers are arranged in series; the light source system also includes at least one first switch component 705, and the at least two lasers are connected through the first switch component 705. By arranging at least two lasers in series, the laser module 703 can not only provide a higher projection brightness for the light source system, but also make the current between different lasers the same, thereby having the same brightness, which is beneficial to the quality of the projected image. In addition, at least two lasers are connected through the first switch component 705. The first switch component 705 can be used to switch between light sources of different colors. It is also possible to short-circuit different lasers in the series circuit so that they no longer receive laser drive signals and enable signals. This can be used to short-circuit a faulty laser to ensure the normal operation of a normal laser. It can also be used to use a single laser for light emission, thereby improving the control flexibility of the laser module 703.

[0116] In some embodiments, at least two lasers are common cathode lasers or common anode lasers. As shown in FIG. 25 , when the lasers are common cathode lasers 70301, four common cathode lasers 70301 are connected in series, with the common cathode of the preceding common cathode laser 70301 connected to the multiple anodes of the succeeding common cathode laser 70301. A first switch assembly 705 can be positioned between the two common cathode lasers 70301, with one end of the first switch assembly 705 connected to the common cathode of the preceding common cathode laser 70301 and the other end connected to the anode of the succeeding common cathode laser 70301. A single first switch assembly 705 can be used to control the on / off connection between the common cathode and multiple anodes, or between the common cathode and one of the anodes. Alternatively, multiple first switch assemblies 705 can be used to individually control the on / off connection between the common cathode and multiple anodes, or between the common cathode and each anode.

[0117] As shown in FIG26 , when the laser is a common anode laser 70302, four common anode lasers 70302 are connected in series, with the cathodes of the preceding common anode lasers 70302 connected to the common anodes of the succeeding common anode lasers 70302. A first switch assembly 705 can be positioned between two common anode lasers 70302, with one end of the first switch assembly 705 connected to the cathode of the preceding common anode laser 70302 and the other end connected to the common anode of the succeeding common anode laser 70302. A single first switch assembly 705 can be used to control the on / off connection between multiple cathodes and the common anode, or to control the on / off connection between a single cathode and the common anode. Alternatively, multiple first switch assemblies 705 can be used to individually control the on / off connection between multiple cathodes and the common anode, or to individually control the on / off connection between each anode and the common anode.

[0118] As shown in FIG20 , in some embodiments, the light source system includes a display control module 701, a laser driving module 702, and a laser module 703. The laser module 703 also includes a plurality of (can also be described as at least two) lasers and a plurality of (can also be described as at least two) first switch assemblies 705 ( FIG20 only shows two lasers and three switch assemblies, namely, a common cathode three-color laser 7031, a common cathode three-color laser 7032, a first switch assembly 7051, a first switch assembly 7052, and a first switch assembly 7053). The plurality of lasers are common cathode lasers or common anode lasers, and the plurality of lasers are connected via a plurality of first switch assemblies 705.

[0119] The laser driving module 702 includes a plurality of constant current components 7021 (three constant current components 7021 are shown in FIG20 , namely, a constant current component 70211, a constant current component 70212, and a constant current component 70213); the plurality of constant current components 7021 are connected to the laser module 703. Exemplarily, in FIG20 , the current output end of the constant current component 70211 is connected to the anode of the red sub-laser of the common cathode three-color laser 7031 in the laser module 703, the current output end of the constant current component 70212 is connected to the anode of the green sub-laser of the common cathode three-color laser 7031 in the laser module 703, the current output end of the constant current component 70213 is connected to the anode of the blue sub-laser of the common cathode three-color laser 7031 in the laser module 703, and the current return ends of the constant current components 70211, 70212, and 70213 are connected to the common cathode of the common cathode three-color laser 705.

[0120] The display control module 701 is respectively connected to multiple constant current components 7021 and multiple first switch components 705, and is used to output a laser driving signal (such as a PWM signal or an analog signal) and a first enable signal to the constant current component 7021, and output a second enable signal to the first switch component 705.

[0121] As shown in FIG20 , in some embodiments, each laser includes at least two laser light sources corresponding to different colors, and the laser light sources of the same color in all lasers are sequentially connected in series to a constant current component 7021, and a first switch component 705 is provided between two adjacent laser light sources. The two laser light sources of the same color in two adjacent lasers can be controlled to be turned on or off by a first switch component 705. When the two laser light sources are turned on, both laser light sources can pass current, and the two laser light sources emit light at the same time; when the two laser light sources are disconnected, the two laser light sources cannot pass current, and the two laser light sources cannot emit light. Among them, the multiple laser light sources in each laser respectively serve as light source elements to emit light of different colors, so that the laser forms a multi-color laser. The laser light source can also be called a sub-laser.

[0122] For example, in FIG20 , each laser includes three laser light sources (or sub-lasers), wherein the laser light source R (or red sub-laser) is used to emit red light, the laser light source G (or green sub-laser) is used to emit green light, and the laser light source B (or blue sub-laser) is used to emit blue light. The display control module 701 is connected to the constant current component 70211, the constant current component 70212 and the constant current component 70213, and is connected to the first switch component 7051, the first switch component 7052 and the first switch component 7053; the display control module 701 outputs a red PWM signal R_PWM to the constant current component 70211, outputs a green PWM signal G_PWM to the constant current component 70212, and outputs a blue PWM signal B_PWM to the constant current component 70213; outputs an enable signal R_EN corresponding to red to the constant current component 70211 and the first switch component 7051, outputs an enable signal G_EN corresponding to green to the constant current component 70212 and the first switch component 7052, and outputs an enable signal B_EN corresponding to blue to the constant current component 70213 and the first switch component 7053.

[0123] The first switch component 705 is used to turn on the multiple lasers when the received second enable signal is at an effective potential; an effective potential refers to a high potential, also known as a high level. The constant current component 7021 is used to drive the laser module 703 to emit light according to the PWM signal when the received enable signal is at an effective potential.

[0124] For example, FIG21 is a timing diagram of the enable signal, PWM signal, and current provided in an embodiment of the present application. Both the enable signal and the PWM signal are periodic signals. FIG21 shows the enable signal and the PWM signal within a cycle. As shown in FIG21, within the R1 period within a cycle, the R1 period is also the laser operating period of the red sub-laser. During the R1 period, the enable signal R_EN is high, the enable signal G_EN is low, and the enable signal B_EN is low. The red PWM signal R_PWM is a square wave signal, the green PWM signal G_PWM is a low-level signal, and the blue PWM signal B_PWM is a low-level signal. During the R1 period, the current R_I flowing through the red sub-laser first increases from 0 and then remains constant. During the period from the end of the R1 period to the beginning of the G1 period, the current R_I gradually decreases to 0.

[0125] During the G1 period within a cycle, which is also the laser operating period of the green sub-laser, the enable signal R_EN is low, the enable signal G_EN is high, and the enable signal B_EN is low. The red PWM signal R_PWM is a low-level signal, the green PWM signal G_PWM is a square wave signal, and the blue PWM signal B_PWM is a low-level signal. During the G1 period, the current G_I flowing through the green sub-laser first increases from 0 and then remains constant. From the end of the G1 period to the beginning of the B1 period, the current G_I gradually decreases to 0.

[0126] During the B1 period within a cycle, which is also the laser operating period of the blue sub-laser, the enable signal R_EN is low, the enable signal G_EN is low, and the enable signal B_EN is high. The red PWM signal R_PWM is a low-level signal, the green PWM signal G_PWM is a low-level signal, and the blue PWM signal B_PWM is a square wave signal. During the B1 period, the current B_I flowing through the blue sub-laser first increases from 0 and then remains constant. From the end of the B1 period to the beginning of the next R1 period, the current B_I gradually decreases to 0. The duty cycles of the red PWM signal R_PWM, the green PWM signal G_PWM, and the blue PWM signal B_PWM can be the same or different.

[0127] For example, in FIG20 , when the enable signal R_EN received by the first switch component 7051 is at a high level, it is adjusted to the on state, thereby conducting the common cathode of the common cathode three-color laser 7031 and the anode of the red sub-laser of the common cathode three-color laser 7032. When the enable signal R_EN received by the constant current component 70211 is at a high level, it applies a driving voltage to the laser module 703 based on the received R_PWM signal. The constant current component 70211 outputs current through the current output terminal. The current sequentially passes through the red sub-laser of the common cathode three-color laser 7031, the switch component 7051, and the red sub-laser of the common cathode three-color laser 7032. The current then flows back to the constant current component 70211 through the current return terminal of the constant current component 70211, causing the red sub-lasers of the common cathode three-color laser 7031 and the red sub-laser of the common cathode three-color laser 7032 to light up and emit red light.

[0128] When the enable signal G_EN received by the first switch component 7052 is at a high level, it is adjusted to the on state, so that the common cathode of the common cathode three-color laser 7031 and the anode of the green sub-laser of the common cathode three-color laser 7032 are conductive. At this time, the enable signal G_EN received by the constant current component 70212 is at a high level. Based on the received G_PWM signal, it applies a driving voltage to the laser module 703. The constant current component 70212 outputs current through the current output terminal. The current passes through the green sub-laser of the common cathode three-color laser 7031, the first switch component 7051, and the green sub-laser of the common cathode three-color laser 7032 in sequence. The current then flows back to the constant current component 70212 through the current return terminal of the constant current component 70212, causing the green sub-laser of the common cathode three-color laser 7031 and the green sub-laser of the common cathode three-color laser 7032 to light up and emit green light.

[0129] When the enable signal B_EN received by the first switch component 7053 is at a high level, it is adjusted to the on state, so that the common cathode of the common cathode three-color laser 7031 and the anode of the blue sub-laser of the common cathode three-color laser 7032 are conductive. At this time, the enable signal B_EN received by the constant current component 70213 is at a high level. Based on the received B_PWM signal, it applies a driving voltage to the laser module 703. The constant current component 70213 outputs current through the current output terminal. The current passes through the blue sub-laser of the common cathode three-color laser 7031, the first switch component 7051, and the blue sub-laser of the common cathode three-color laser 7032 in sequence. The current then flows back to the constant current component 70213 through the current return terminal of the constant current component 70213, causing the blue sub-laser of the common cathode three-color laser 7031 and the blue sub-laser of the common cathode three-color laser 7032 to light up and emit blue light.

[0130] It should be noted that the light source system also includes a power supply 800, which is connected to the display control module 701 and each constant current component 7021, and is used to supply power to the display control module 701 and each constant current component 7021. As shown in Figure 20, the light source system also includes a power supply 800, which is respectively connected to the display control module 701, the constant current component 70211, the constant current component 70212, and the constant current component 70213. The following describes the situation where the lasers are connected in series. If the lasers in the light source system are common cathode lasers, then for the first laser and the second laser in the two series-connected lasers, the anode of the sub-laser in the second laser is respectively connected to the first end of the corresponding first switch component; the second end of the switch component connected to the second laser is connected to the common cathode of the first laser.

[0131] In some embodiments, as shown in FIG20 , the laser shown in FIG20 is a common cathode three-color laser, the first laser is a common cathode three-color laser 7031, the second laser is a common cathode three-color laser 7032, the anode of the red sub-laser in the common cathode three-color laser 7032 is connected to the first end of the first switch component 7051 corresponding to the red color, the anode of the green sub-laser in the common cathode three-color laser 7032 is connected to the first end of the first switch component 7052 corresponding to the green color, the anode of the blue sub-laser in the common cathode three-color laser 7032 is connected to the first end of the first switch component 7053 corresponding to the blue color, and the common cathode of the common cathode three-color laser 7031 is connected to the second ends of the first switch component 7051, the first switch component 7052, and the first switch component 7053, respectively.

[0132] It should be noted that the laser in the light source system can also be a common cathode two-color laser. FIG22 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in FIG22, for example, the laser in the figure is a common cathode two-color laser, wherein the sub-lasers are a red sub-laser and a green sub-laser. The laser driver module 702 also includes only two constant current components 7021, namely a constant current component 70211 and a constant current component 70212. The current output end of the constant current component 70211 is connected to the anode of the red sub-laser of the common cathode two-color laser 713 in the laser module 703, the current output end of the constant current component 70212 is connected to the anode of the green sub-laser of the common cathode two-color laser 713 in the laser module 703, and the current return ends of the constant current components 70211 and 70212 are connected to the common cathode of the common cathode two-color laser 714.

[0133] In FIG22 , the first laser is a common cathode dual-color laser 7035, and the second laser is a common cathode dual-color laser 7036. The anode of the red sub-laser in the common cathode dual-color laser 7036 is connected to the first end of the first switch component 7051 corresponding to red, and the anode of the green sub-laser in the common cathode dual-color laser 7036 is connected to the first end of the first switch component 7052 corresponding to green. The common cathode of the common cathode dual-color laser 7035 is connected to the second ends of the first switch component 7051 and the first switch component 7052, respectively.

[0134] It should be noted that the sub-lasers in the common cathode dual-color laser can also be a blue sub-laser and a green sub-laser, or a red sub-laser and a blue sub-laser. The embodiment of the present application does not limit the sub-lasers in the dual-color laser and can be set according to actual conditions.

[0135] If the laser in the light source system is a common anode laser, then for the third laser and the fourth laser in the two lasers connected in series, the cathode of the neutron laser in the third laser is respectively connected to the first end of the corresponding switch component; the second end of the switch component connected to the third laser is connected to the common anode of the fourth laser.

[0136] FIG23 is a schematic diagram of the structure of another light source system provided in an embodiment of the application. As shown in FIG23 , in some embodiments, the lasers in the figure are common anode lasers, namely, common anode three-color laser 7033 and common anode three-color laser 7034. The current output terminals of constant current components 70211, 70212, and 70213 are connected to the common anode of common anode three-color laser 7033 in laser module 703. The current return terminal of constant current component 70211 is connected to the cathode of the red sub-laser of common anode three-color laser 7034. The current return terminal of constant current component 70212 is connected to the cathode of the green sub-laser of common anode three-color laser 7034. The current return terminal of constant current component 70213 is connected to the cathode of the blue sub-laser of common anode three-color laser 7034.

[0137] In FIG23 , the third laser is a common anode three-color laser 7033, and the fourth laser is a common anode three-color laser 7034. The cathode of the red sub-laser in the common anode three-color laser 7033 is connected to the first end of the first switch component 7051 corresponding to red, the cathode of the green sub-laser in the common anode three-color laser 7033 is connected to the first end of the first switch component 7052 corresponding to green, the cathode of the blue sub-laser in the common anode three-color laser 7033 is connected to the first end of the first switch component 7053 corresponding to blue, and the common cathode of the common anode three-color laser 7034 is connected to the second ends of the first switch component 7051, the first switch component 7052, and the first switch component 7053, respectively.

[0138] When the enable signal R_EN received by the first switch component 7051 is at a high level, it is adjusted to the on state, so that the cathode of the red sub-laser of the common anode three-color laser 7033 is conductively connected to the common anode of the common anode three-color laser 7034. When the enable signal G_EN received by the first switch component 7052 is at a high level, it is adjusted to the on state, so that the cathode of the green sub-laser of the common anode three-color laser 7033 is conductively connected to the common anode of the common anode three-color laser 7034. When the enable signal B_EN received by the first switch component 7053 is at a high level, it is adjusted to the on state, so that the cathode of the blue sub-laser of the common anode three-color laser 7033 is conductively connected to the common anode of the common anode three-color laser 7034.

[0139] When the enable signal R_EN received by the constant current component 70211 is at a high level, a driving voltage is applied to the laser module 703 according to the received R_PWM signal. The constant current component 70211 outputs current through the current output terminal. The current passes through the red sub-laser of the common anode three-color laser 7033, the first switch component 7051, and the red sub-laser of the common anode three-color laser 7034 in sequence, and then flows back to the constant current component 70211 through the current return terminal of the constant current component 70211. The common cathode of the common anode three-color laser 7033 and the red sub-laser in the common anode three-color laser 7034 light up and emit red light. Because the enable signal R_EN received by the constant current component 70211 is high, the enable signal R_EN received by the constant current component 70212 and the constant current component 70213 is high or low, and the constant current component 70212 and the constant current component 70213 do not receive current from the common anode three-color laser 7034. Therefore, the common cathode of the common anode three-color laser 7033 and the green sub-laser and the blue sub-laser in the common anode three-color laser 7034 will not light up. It should be noted that the process of lighting up the green sub-laser and the blue sub-laser is similar to the process of lighting up the red sub-laser, and will not be repeated here.

[0140] It should be noted that the laser in the light source system can also be a common anode two-color laser. Figure 24 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in Figure 24, for example, the laser in the figure is a common anode two-color laser, wherein the sub-lasers are a red sub-laser and a green sub-laser. The laser driver module 702 also only includes two constant current components 7021, namely a constant current component 70211 and a constant current component 70212. The current output terminals of the constant current components 70211 and 70212 are connected to the common anode of the common anode two-color laser 7037 in the laser module 703, the current return terminal of the constant current component 70211 is connected to the cathode of the red sub-laser of the common anode two-color laser 7038, and the current return terminal of the constant current component 70212 is connected to the cathode of the green sub-laser of the common anode two-color laser 7038.

[0141] In FIG24 , the third laser is a common anode dual-color laser 7037, and the fourth laser is a common anode dual-color laser 7038. The cathode of the red sub-laser in the common anode dual-color laser 7037 is connected to the first end of the first switch component 7051 corresponding to red, and the cathode of the green sub-laser in the common anode dual-color laser 7037 is connected to the first end of the first switch component 7052 corresponding to green. The common anode of the common anode dual-color laser 7038 is connected to the second ends of the first switch component 7051 and the first switch component 7052, respectively.

[0142] It should be noted that the sub-lasers in the common anode dual-color laser can also be a blue sub-laser and a green sub-laser, or a red sub-laser and a blue sub-laser. The embodiment of the present application does not limit the sub-lasers in the dual-color laser and can be set according to actual conditions.

[0143] FIG25 is a schematic diagram of a circuit structure for connecting multiple common-cathode three-color lasers in series according to an embodiment of the present application. As shown in FIG25 , four common-cathode three-color lasers 70301 are shown as an example. For each two common-cathode three-color lasers 70301 connected in series, the anode of the red sub-laser of one common-cathode three-color laser is connected to one end of the first switch component 705 corresponding to the red color, the anode of the green sub-laser is connected to one end of the first switch component 705 corresponding to the green color, and the anode of the blue sub-laser is connected to one end of the first switch component 705 corresponding to the blue color. The common cathode of another common-cathode three-color laser 70301 is connected to the other ends of the three first switch components 705. For the first common-cathode three-color laser 70301 of the four common-cathode three-color lasers 70301 connected in series, the anode of the red sub-laser is connected to the current output terminal of the constant-current component 7021 corresponding to the red color, the anode of the green sub-laser is connected to the current output terminal of the constant-current component 7021 corresponding to the green color, and the anode of the blue sub-laser is connected to the current output terminal of the constant-current component 7021 corresponding to the blue color. The common cathode of the fourth common cathode three-color laser 70301 in the four series-connected common cathode three-color lasers 70301 is connected to the current return terminal of each constant current component 7021. The first switch component 705 in Figure 25 is connected to the display control module 701, and the enable signal corresponding to each color can be transmitted to the corresponding first switch component 705.

[0144] It should be noted that the series structure of multiple common cathode two-color lasers is similar to the common cathode three-color laser, and will not be described in detail here. The embodiment of the present application does not limit the number of common cathode lasers, and can be set according to actual conditions.

[0145] Figure 26 is a schematic diagram of the circuit structure of multiple common anode three-color lasers connected in series according to an embodiment of the present application. As shown in Figure 26, four common anode three-color lasers 70302 are shown in the figure as an example. For every two common anode three-color lasers 70302 connected in series, the cathode of the red sub-laser of one common anode three-color laser 70302 is connected to one end of the first switch component 705 corresponding to red, the cathode of the green sub-laser is connected to one end of the first switch component 705 corresponding to green, the cathode of the blue sub-laser is connected to one end of the first switch component 705 corresponding to blue, and the common anode of another common anode three-color laser 70302 is connected to the other end of the three first switch components 705. For the fourth common-anode three-color laser 70302 among the four series-connected common-anode three-color lasers 70302, the cathode of the red sub-laser is connected to the current return terminal of the constant-current component 7021 corresponding to the red color, the cathode of the green sub-laser is connected to the current return terminal of the constant-current component 7021 corresponding to the green color, and the cathode of the blue sub-laser is connected to the current return terminal of the constant-current component 7021 corresponding to the blue color. The common anode of the first common-anode three-color laser 70302 among the four series-connected common-anode three-color lasers 70302 is connected to the current output terminal of each constant-current component 7021. The first switch component 705 in Figure 26 is connected to the display control module 701, and the enable signals corresponding to different luminous colors can be transmitted to the corresponding first switch component 705. It should be noted that the series connection structure of multiple common-anode two-color lasers is similar to that of the common-anode three-color laser and will not be further described here. This embodiment of the application does not limit the number of common-anode lasers and can be set according to actual circumstances.

[0146] It should be noted that the first switch component 705 in the laser module 703 can be a metal-oxide-semiconductor field-effect transistor (MOS transistor). The gate of the MOS transistor serves as the control terminal of the switch transistor. The gate of the MOS transistor is connected to the display control component and is configured to receive an enable signal sent by the display control component. The source of the MOS transistor is connected to the common cathode of a three-color laser with a common cathode, or the common cathode of a two-color laser with a common cathode, or the cathode of a sub-laser in a three-color laser with a common anode, or the cathode of a sub-laser in a two-color laser with a common anode. The drain of the MOS transistor is connected to the anode of a sub-laser in a three-color laser with a common cathode, or the anode of a sub-laser in a two-color laser with a common cathode, or the common anode of a three-color laser with a common anode, or the common anode of a two-color laser with a common anode. When the gate of the MOS transistor is at a high level, the source and drain of the MOS transistor are conductive, thereby turning on the sub-lasers of the same emission color in the series-connected lasers. The first switch component 705 in the laser module 703 can be a triode. The base of the triode serves as the control terminal of the switch tube. The base of the triode is connected to the display control component and is used to receive an enable signal sent by the display control component. The collector of the triode is connected to the common cathode of a common cathode three-color laser, or the common cathode of a common cathode two-color laser, or the cathode of a sub-laser in a common anode three-color laser, or the cathode of a sub-laser in a common anode two-color laser. The emitter of the triode is connected to the anode of a sub-laser in a common cathode three-color laser, or the anode of a sub-laser in a common cathode two-color laser, or the common anode of a common anode three-color laser, or the common anode of a common anode two-color laser. When the base of the triode is at a high voltage level, the base, emitter, and collector of the triode are conductive, causing the sub-lasers of the same luminous color in the series-connected lasers to be conductive.

[0147] The light source system provided in this embodiment includes multiple lasers and multiple switch components through the laser module. Each laser is a common cathode laser or a common anode laser. Every two lasers are connected by a switch component corresponding to each light-emitting color of the laser, which can realize the series connection of common cathode lasers or common anode lasers, so that the current of multiple common cathode lasers or common anode lasers is consistent, and thus the brightness of the display screen is consistent; using multiple lasers makes the brightness of the display screen higher; using constant current components according to the number of light-emitting colors of the laser can effectively reduce the number of chips, reduce costs, facilitate miniaturization, and reduce the generated common magnetic interference.

[0148] FIG27 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. The constant current component 7021 is described below in conjunction with FIG27. In some embodiments, the constant current component 7021 includes a constant current chip 7021a, a voltage regulating component 7021b, and a first sampling resistor 7021c. For example, as shown in FIG27, the constant current component 70211 includes a constant current chip 7021a1, a voltage regulating component 7021b1, and a first sampling resistor 7021c1; the constant current component 70212 includes a constant current chip 7021a2, a voltage regulating component 7021b2, and a first sampling resistor 7021c2; and the constant current component 70213 includes a constant current chip 7021a3, a voltage regulating component 7021b3, and a first sampling resistor 7021c3.

[0149] The display control module 701 is respectively connected to the constant current chips 7021a in the multiple constant current components 7021 for outputting a laser driving signal (eg, a PWM signal) and a first enable signal to the constant current chips 7021a in the multiple constant current components 7021 .

[0150] For example, in Figure 27, the display control module 701 is connected to the constant current chip 7021a1, the constant current chip 7021a2 and the constant current chip 7021a3. The display control module 701 outputs a red PWM signal R_PWM to the constant current chip 7021a1, outputs a green PWM signal G_PWM to the constant current chip 7021a2, and outputs a blue PWM signal B_PWM to the constant current chip 7021a3; outputs an enable signal R_EN corresponding to red to the constant current chip 7021a1, outputs an enable signal G_EN corresponding to green to the constant current chip 7021a2, and outputs an enable signal B_EN corresponding to blue to the constant current chip 7021a3.

[0151] The constant current chip 7021a in the constant current component 7021 is connected to the voltage regulating component 7021b, the constant current chip 7021a and the voltage regulating component 7021b are connected to one end of the first sampling resistor 7021c in the constant current component 7021, the other end of the first sampling resistor 7021c is grounded, and the voltage regulating component 7021b is connected to the laser module 703.

[0152] For example, in Figure 27, the current output end of the constant current chip 7021a1 in the constant current component 70211 is connected to the current input end of the voltage regulating component 7021b1, the current output end of the voltage regulating component 7021b1 is connected to the anode of the red sub-laser of the common cathode three-color laser 7031 in the laser module 703, the common cathode of the common cathode three-color laser 7032 in the laser module 703 is connected to the current return end of the voltage regulating component 7021b1, the current return output end of the voltage regulating component 7021b1 is connected to the sampling end of the constant current chip 7021a1 and one end of the sampling resistor 7021c1 in the constant current component 70211, and the other end of the sampling resistor 7021c1 is grounded; the control signal output end of the constant current chip 7021a1 is connected to the control end of the constant current component 7021a1, and the constant current chip 7021a1 outputs the control signal to the constant current component 7021b1 through the control signal output end.

[0153] The current output end of the constant current chip 7021a2 in the constant current component 70212 is connected to the current input end of the voltage regulating component 7021b2, the current output end of the voltage regulating component 7021b2 is connected to the anode of the green sub-laser of the common cathode three-color laser 7031 in the laser module 703, the common cathode of the common cathode three-color laser 7032 in the laser module 703 is connected to the current return end of the voltage regulating component 7021b2, the current return output end of the voltage regulating component 7021b2 is connected to the sampling end of the constant current chip 7021a2, and the other end of the sampling resistor 7021c2 is grounded; the control signal output end of the constant current chip 7021a2 is connected to the control end of the constant current component 7021b2, and the constant current chip 7021a2 outputs the control signal to the constant current component 7021b2 through the control signal output end.

[0154] The current output end of the constant current chip 7021a3 in the constant current component 70213 is connected to the current input end of the voltage regulating component 7021b3, the current output end of the voltage regulating component 7021b3 is connected to the anode of the blue sub-laser of the common cathode three-color laser 7031 in the laser module 703, the common cathode of the common cathode three-color laser 7032 in the laser module 703 is connected to the current return end of the voltage regulating component 7021b3, the current return output end of the voltage regulating component 7021b3 is connected to the sampling end of the constant current chip 7021a3 and one end of the sampling resistor 7021c3 in the constant current component 70213, and the other end of the sampling resistor 7021c3 is grounded; the control signal output end of the constant current chip 7021a3 is connected to the control end of the constant current component 7021b3, and the constant current chip 7021a3 outputs a control signal to the constant current component 7021b3 through the control signal output end.

[0155] The constant current chip 7021a is used to output a control signal and a load voltage to the voltage regulating component 7021b according to the voltage of the received PWM signal and the sampled current obtained through the first sampling resistor 7021c when the received enable signal is a valid potential; the voltage regulating component 7021b is used to load a driving voltage to the laser module 703 according to the received control signal, thereby driving each laser in the laser module 703 to emit light.

[0156] For example, in FIG27 , when the enable signal R_EN received by the constant current chip 7021a1 is at a high level, the constant current chip 7021a1 collects the sampled current flowing out of the current return output end of the voltage regulating component 7021b1 through the sampling end according to the received R_PWM signal, and outputs a control signal and a loaded voltage to the voltage regulating component 7021b1. The voltage regulating component 7021b1 adjusts the voltage loaded on itself according to the received control signal to obtain a driving voltage, and then loads the driving voltage to the laser module 703. The voltage regulating component 7021b1 outputs current through the current output terminal. The current sequentially passes through the red sub-laser of the common cathode three-color laser 7031, the first switch component 7051, and the red sub-laser of the common cathode three-color laser 7032. The current then flows back to the voltage regulating component 7021b1 through the current return terminal of the voltage regulating component 7021b1. The current then flows into the ground through the sampling resistor 7021c1. The common cathode of the common cathode three-color laser 7031 and the red sub-laser in the common cathode three-color laser 7032 light up and emit red light.

[0157] When the enable signal G_EN received by the constant current chip 7021a2 is at a high level, the constant current chip 7021a2 collects the sampled current flowing out of the current return output end of the voltage regulating component 7021b2 through the sampling end according to the received G_PWM signal, and outputs a control signal and a loaded voltage to the voltage regulating component 7021b2. The voltage regulating component 7021b2 adjusts the voltage loaded on itself according to the received control signal to obtain a driving voltage, and then loads the driving voltage to the laser module 703. The voltage regulating component 7021b2 outputs current through the current output terminal. The current passes through the green sub-laser of the common cathode three-color laser 7031, the first switch component 7052, and the green sub-laser of the common cathode three-color laser 7032 in sequence. Then, the current flows back to the voltage regulating component 7021b2 through the current return terminal of the voltage regulating component 7021b2. Then, the current flows into the ground through the sampling resistor 7021c2. The common cathode of the common cathode three-color laser 7031 and the green sub-laser in the common cathode three-color laser 7032 light up and emit green light.

[0158] When the enable signal B_EN received by the constant current chip 7021a3 is at a high level, the constant current chip 7021a3 collects the sampled current flowing out of the current return output end of the voltage regulating component 7021b3 through the sampling end according to the received B_PWM signal, and outputs a control signal and a loaded voltage to the voltage regulating component 7021b3. The voltage regulating component 7021b3 adjusts the voltage loaded on itself according to the received control signal to obtain a driving voltage, and then loads the driving voltage to the laser module 703. The voltage regulating component 7021b3 outputs current through the current output terminal. The current passes through the blue sub-laser of the common cathode three-color laser 7031, the first switch component 7053, and the green sub-laser of the common cathode three-color laser 7032 in sequence. Then, the current flows back to the voltage regulating component 7021b3 through the current return terminal of the voltage regulating component 7021b3. Then, the current flows into the ground through the sampling resistor 7021c3. The common cathode of the common cathode three-color laser 7031 and the blue sub-laser in the common cathode three-color laser 7032 light up and emit blue light.

[0159] For example, based on FIG. 27 , FIG. 28 is a schematic diagram of a partial circuit structure for driving a red sub-laser according to an embodiment of the present application. As shown in FIG. 28 , in some embodiments, the voltage regulating component 7021b1 is a Buck circuit, which includes a switch component SO, a diode D0, and an inductor L0. The first end of the switch component SO serves as a current return output terminal for the voltage regulating component 7021b1. The second end of the switch component SO is connected to the anode of the diode D0. The second end of the switch component SO serves as a current return terminal for the voltage regulating component 7021b1. The control end of the switch component SO serves as a control end for the voltage regulating component 7021b1. The cathode of the diode D0 is connected to the first end of the inductor L0. The first end of the inductor L0 serves as a current input terminal for the voltage regulating component 7021b1, and the second end of the inductor L0 serves as a current output terminal for the voltage regulating component 7021b1. Constant current chip 7021a1 sends a control signal to the control terminal of switch component SO. When the control signal is active (high), switch component SO conducts; when the control signal is inactive (low), switch component SO disconnects. By adjusting the duration of the active and inactive voltages, the duration of switch component SO's conduction and disconnection can be adjusted, thereby adjusting the duty cycle and voltage. The Buck circuit is a step-down circuit.

[0160] This Buck circuit reduces the voltage provided by the constant current chip 7021a1 to the operating voltage of the laser, allowing the laser to operate normally at a constant current. It should be noted that the Buck circuit may also include a capacitor, one end of which is connected to the second end of the inductor, and the other end of which is connected to the positive electrode of the diode. It should be noted that Figure 28 is only an example of the voltage regulating component in the current driving the red sub-laser. When this voltage regulating component is a Buck circuit, other voltage regulating components in the light source system are also Buck circuits, and will not be described in detail here.

[0161] For example, based on FIG. 27 , FIG. 29 is a schematic diagram of a partial circuit structure for driving a red sub-laser according to an embodiment of the present application. As shown in FIG. 29 , in some embodiments, the voltage regulating component 7021b1 is a boost circuit, which includes a switch component S0, a diode D0, and an inductor L0. The first end of the switch component S0 serves as the current return output terminal of the voltage regulating component 7021b1 and also serves as the current return terminal of the voltage regulating component 7021b1. The second end of the switch component S0 is connected to the anode of the diode D0 and the first end of the inductor L0. The control end of the switch component S0 serves as the control end of the voltage regulating component 7021b1. The cathode of the diode D0 serves as the current output terminal of the voltage regulating component 7021b1, and the second end of the inductor L0 serves as the current input terminal of the voltage regulating component 7021b1.

[0162] The constant current chip 7021a1 sends a control signal to the control end of the switch component S0. When the control signal is an effective potential (high level), the switch component S0 is turned on; when the control signal is an invalid potential (low level), the switch component S0 is disconnected. By adjusting the duration of the effective potential and the invalid potential, the duration of the switch component S0 being turned on and off can be adjusted, thereby adjusting the duty cycle and adjusting the voltage. The Boost circuit is a step-up circuit. The Boost circuit raises the voltage provided by the constant current chip 7021a1 to the operating voltage of the laser, so that the laser can operate normally under a constant current. It should be noted that the Boost circuit may also include a capacitor, one end of the capacitor being connected to the cathode of the diode, and the other end of the capacitor being connected to the first end of the switch component. It should be noted that Figure 29 is only an example of a voltage-regulating component in the current driving the red sub-laser. When the voltage-regulating component is a Boost circuit, other voltage-regulating components in the light source system are also Boost circuits, which will not be described in detail here.

[0163] For example, based on FIG. 27 , FIG. 30 is a schematic diagram of a partial circuit structure for driving a red sub-laser according to an embodiment of the present application. As shown in FIG. 30 , in some embodiments, the voltage regulating component 7021b1 is a Buck-Boost circuit, which includes a switch component S0, a diode D0, and an inductor L0. The first end of the switch component S0 serves as a current return output terminal for the voltage regulating component 7021b1. The second end of the switch component S0 is connected to the first end of the inductor L0. The second end of the switch component S0 serves as a current return terminal for the voltage regulating component 7021b1. The control end of the switch component S0 serves as a control end for the voltage regulating component 7021b1. The second end of the inductor L0 is connected to the cathode of the diode D0. The cathode of the diode D0 serves as a current input terminal for the voltage regulating component 7021b1, and the anode of the diode D0 serves as a current output terminal for the voltage regulating component 7021b1.

[0164] The constant current chip 7021a1 sends a control signal to the control terminal of the switch component S0. When the control signal is an effective potential (high level), the switch component S0 is turned on; when the control signal is an invalid potential (low level), the switch component S0 is disconnected. By adjusting the duration of the effective potential and the invalid potential, the duration of the switch component S0 turning on and off can be adjusted, thereby adjusting the duty cycle and adjusting the voltage. The Buck-Boost circuit can either step up or step down the voltage. When the voltage provided by the constant current chip 7021a1 is different from the operating voltage of the laser, the Buck-Boost circuit adjusts the voltage provided by the constant current chip to the operating voltage of the laser, so that the laser can operate normally under a constant current. It should be noted that the Buck-Boost circuit may also include a capacitor, one end of which is connected to the positive electrode of the diode, and the other end of which is connected to the second end of the switch tube. It should be noted that Figure 30 is only an example of the voltage regulating component in the current driving the red sub-laser. When the voltage regulating component is a Buck-Boost circuit, other voltage regulating components in the light source system are also Buck-Boost circuits, which will not be repeated here.

[0165] It should be noted that the switching tube in the voltage regulating component can be a MOS tube, a triode, or an electronic device or circuit that can be turned on and off according to the level of the control signal. The embodiment of the present application does not limit the switching tube in the voltage regulating component and can be set according to actual conditions.

[0166] The light source system provided in this embodiment, through the constant current chip and voltage-regulating components in the constant current assembly, can precisely control the current flowing into multiple lasers, maintaining a stable current flow. It can also adjust the voltage to ensure that the lasers operate at the operating voltage and ensure the safe operation of the light source system. Furthermore, this solution uses fewer constant current components and correspondingly fewer switching components, effectively reducing costs, occupied volume, energy loss, and common magnetic interference.

[0167] The embodiment of the present application also provides a light source system, which includes a display control module 701, a laser driver module 702, and a laser module 703. The laser driver module 702 includes multiple constant current components 7021, and the multiple constant current components 7021 are connected to the laser module 703. The display control module 701 is respectively connected to the multiple constant current components 7021, and is used to output a laser drive signal (such as a dimming analog signal or a pulse width modulation signal) and a first enable signal to the multiple constant current components 7021; the laser module 703 includes multiple lasers and multiple first switch components 705, and the multiple lasers are common cathode lasers or common anode lasers. The multiple lasers are connected through multiple first switch components 705. The display control module 701 is respectively connected to the multiple first switch components 705, and is used to output a second enable signal to the multiple first switch components 705.

[0168] FIG31 is a flow chart of a laser control method provided by the present application. As shown in FIG31 , in some embodiments, the laser control method includes the following steps:

[0169] S3101: The display control module 701 determines the laser operating period, the target first switch component 705 among the multiple first switch components 705, and the target constant current component 7021 among the multiple constant current components 7021. In this step, in order to display an image, within one cycle, each sub-laser in the laser is lit during its laser operating period, so the display control module 701 needs to obtain the operating period, the target first switch component 705 among the multiple first switch components 705, and the target constant current component 7021 among the multiple constant current components 7021.

[0170] S3102: During the laser operation period, the second enable signal output to the target first switch component 705 and the first enable signal output to the target constant current component 7021 are controlled to be effective potentials. In this step, after the display control module 701 obtains the operation period, the target first switch component 705 and the target constant current component 7021, during the laser operation period, the enable signal output to the target first switch component 705 and the target constant current component 7021 is controlled to be effective potentials. When the second enable signal received is an effective potential, the target first switch component 705 is adjusted to the on state, turning on the two lasers connected to the target first switch component 705. When the first enable signal received is a valid potential, the target constant current component 7021 applies a driving voltage to the laser module 703 according to the laser driving signal (for example, a PWM signal), and outputs current to the laser module 703. The current flows through the target sub-laser (or target laser light source) of each laser in the laser module 703 and the target first switch component 705, and then flows back to the target constant current component 7021, and the target sub-laser emits light.

[0171] S3103: Monitor whether the laser working period has ended; if it is monitored that the laser working period has not ended, execute step S1702; if it is monitored that the laser working period has ended, execute step S1704.

[0172] S3104: Control the enable signal output to the target switch component and the target constant current component to be an invalid potential. In the above steps, the display control component will detect whether the laser working period has ended; if it is monitored that the laser working period has not ended, it means that it is still in the laser working period and the laser needs to work, then step S3102 is executed; if it is monitored that the laser working period has ended, then when the display control component ends the laser working period, the enable signal output to the target first switch component 705 and the target constant current component 7021 is controlled to be an invalid potential (low potential, also known as low level). When the enable signal received is an invalid potential, the target first switch component 705 is adjusted to the disconnected state and the two lasers connected to the target first switch component 705 are disconnected. When the enable signal received is an invalid potential, the target constant current component 7021 stops loading the driving voltage to the laser module 703, stops outputting current to the laser module 703, and the target sub-laser in the laser module 703 is extinguished.

[0173] The light source system provided in the present application includes multiple lasers and multiple first switch components through the laser module 703. The lasers are common cathode lasers or common anode lasers. The two lasers are connected through the first switch component, which can realize the series connection of common cathode lasers or common anode lasers, so that the currents of multiple common cathode lasers or common anode lasers are consistent, and thus the brightness of the displayed image is consistent; using multiple lasers makes the brightness of the displayed image higher; it can also effectively reduce the number of chips, reduce costs, facilitate miniaturization, and reduce the generated common magnetic interference.

[0174] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0175] FIG32 is a schematic diagram of the circuit structure of a three-color laser provided by the related art. As shown in FIG32 , each of the red, green, and blue lasers requires two corresponding pins, which means that the three-color laser requires at least 6 pins. FIG33 is a schematic diagram of the circuit structure of a light source system provided by the related art. As shown in FIG33 , when the light source system is turned on, the projection display control processing unit 3302 of the light source system (which may include, for example, a digital light processing chip DLP display chip) can, after initialization, use three sets of general-purpose input / output (GPIO) to control the enable (EN) signals of six constant current integrated circuits (ICs) according to the set duty timing, and control the brightness of each laser through three sets of dimming (DIMMING) pins.

[0176] As shown in Figure 33, when driving two lasers, the light source system of the related technology requires at least 6 constant current IC chips (N1, N2, N3, N4, N5, N6 as shown in Figure 33), 6 inductors (L1, L2, L3, L4, L5, L6 as shown in Figure 33), 6 Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET, MOS tube for short), M1, M2, M3, M4, M5, M6 as shown in Figure 33, and 6 diodes (D1, D2, D3, D4, D5, D6 as shown in Figure 33), and 6 groups of current sampling resistors (R1, R2, R3, R4, R5, R6 as shown in Figure 33).

[0177] Therefore, the light source system provided by the related technology has the following technical problems: 1. Due to problems such as the factory accuracy of the current sampling resistor, there is a current difference between two lasers of the same color in a parallel circuit, and the current difference will cause a difference in the laser luminous flux, which in turn causes a difference in the screen display, so the user experience is poor. 2. Because many components are required, such as at least 6 constant current IC chips, 6 custom inductors, 6 MOS tubes, etc., the laser occupies a large area. 3. Because the 6-way MOS switching loss, conduction loss, etc. will generate a lot of heat, the laser also needs to use a larger heat sink, which further increases the area occupied by the laser. 4. When the 6-way MOS is in constant current regulation, frequent switching will generate a large amount of electromagnetic radiation, leading to electromagnetic compatibility (EMC) problems, which in turn requires the addition of magnetic rings or components for shielding to solve EMC problems in the later stage, which further increases the area occupied by the laser.

[0178] In other words, the lasers in existing light source systems still have the problem of occupying a large area and providing a poor user experience.

[0179] Taking into account the above-mentioned problems existing in existing light source systems, this application proposes a light source system that connects multiple lasers through a switch module to ensure that the driving signal strength flowing through different lasers is the same. Through this light source system, the driving signal strength flowing through multiple lasers of the same color is the same, thereby reducing the difference in screen display and improving the user experience. For the above-mentioned lasers, the light source system provided by this application can use fewer devices to control the laser lighting amount, reducing the occupied area of ​​the light source system and further realizing the miniaturization of the light source system.

[0180] Figure 34 is a schematic diagram of the circuit structure of another light source system provided in an embodiment of the present application. As shown in Figure 34, in some embodiments, the light source system may include: a display control module 701, a driving device, and N lasers. Each of the lasers may include a laser light source of i colors, and the above-mentioned i-color laser light sources correspond to the same positive pole or the same negative pole. The above-mentioned N and i are both integers greater than or equal to 2. The above-mentioned driving device may include: a first switch component 705, and a laser driving module 702. The N lasers can be connected to each other through the first switch component 705. It should be understood that the laser comprising i laser light sources (or sub-lasers) in the present application can also be understood as a light source module comprising i-color lasers. They are just different in name, but are essentially the same.

[0181] The structural schematic diagrams of the light source system involved in any part of this application are all exemplary descriptions of the structure of the light source system, taking the case where the light source system includes two lasers, and each laser includes a red laser light source, a green laser light source, and a blue laser light source as an example. This application does not limit the number of lasers included in the light source system, the number of laser light sources included in each laser, and the laser light sources that emit what color light beams. In addition, it should be understood that Figure 34 is only an exemplary description of the light source system, taking the example of i-color laser light sources corresponding to the same positive electrode. As mentioned above, the i-color laser light sources can also correspond to the same negative electrode.

[0182] Exemplarily, the display control module 701 may be, for example, a system on chip (SOC) or the aforementioned DLP. In some embodiments, the display control module 701 may also be referred to as a display control processing unit. The display control module 701 may be configured to output first enable signals corresponding to i colors to the laser driver module 702, and to output second enable signals corresponding to i colors to the first switch component 705. Exemplarily, the display control module 701 may output the first enable signal to the laser driver module 702, and output the second enable signal to the first switch component 705, for example, based on a preset timing signal representing the order in which the laser light source is turned on.

[0183] For any color, the laser driver module 702 can be configured to output a drive signal to the laser of that color when the first enable signal corresponding to that color reaches a target value. The first switch component 705 can be configured to connect the laser light sources of that color when the second enable signal corresponding to that color reaches a target value, so that the laser light sources of that color receive the drive signal and light up.

[0184] Optionally, the driving signal may be, for example, a driving current or a driving voltage, etc., which is not limited in this application. For example, taking the first enable signal as a level signal, the target value may be, for example, the effective level of the first enable signal.

[0185] In this embodiment, N lasers are connected through a first switch component 705, so that the laser light sources of the same color between the N lasers can be turned on by the first switch component 705, thereby making the signal intensity of the driving current from the laser driver module 702 applied to different laser light sources of the same color the same, thereby reducing the difference in luminous flux between the laser light sources, thereby reducing the difference in screen display and improving the user experience. Through the light source system provided by this application, the i-color laser light sources included in the laser can correspond to the same positive pole or the same negative pole. Through the above method, the number of pins required to deploy the laser is reduced, thereby reducing the space required for the laser, thereby reducing the space occupied by the light source system, making the light source system miniaturized.

[0186] As shown in FIG35 , in some embodiments, the driving device may further include: a second switch component 706. In this implementation, the display control module 701 may further be configured to output a third enable signal to the second switch component 706. The second switch component 706 may be turned on when the third enable signal is a second value, so that the laser light source in at least one target laser among the N lasers does not receive the aforementioned drive current. For example, taking the aforementioned drive signal as a drive current as an example, when the second switch component 706 is turned on in response to the second value of the second enable signal, it may, for example, short-circuit the aforementioned target laser, thereby preventing the laser light source in the target laser from receiving the aforementioned drive current.

[0187] When the laser light source in the target laser does not receive the aforementioned drive signal, the laser light source in the target laser will not light up. Optionally, in this implementation, the light source system can, for example, continue to perform projection display using multiple laser light sources in the N lasers other than the target laser. Exemplarily, the display control module 701 can, for example, control the multiple laser light sources in the "N lasers other than the target laser" through the laser drive module 702 to simultaneously light up for laser projection display, thereby improving the display brightness of the laser device.

[0188] In this embodiment, the second switch component 706 can be used to control the laser light source in at least one target laser among the N lasers to not receive a driving signal, thereby enabling the light source system to perform projection display without the laser light source in the target laser.

[0189] The following takes N equal to 2 and i greater than 2 as an example to illustrate the connection method of the second switch component 706 in the light source system:

[0190] Taking the laser light sources of i colors included in the laser as an example corresponding to the same cathode, Figure 35 is a structural diagram of another light source system provided by an embodiment of the present application. As shown in Figure 35, in some embodiments, the first end of the second switch component 706 can be connected to the display control module 701 (it should be understood that this is not shown in Figure 35). The second end of the second switch component 706 can be connected to the cathode of the laser light sources of i colors included in the laser except the target laser. The third end of the second switch component 706 can be connected to the cathode of the laser light sources of i colors included in the target laser. In Figure 35, the common cathode three-color laser 7032 is the aforementioned target laser, and the common cathode three-color laser 7031 is the aforementioned laser except the target laser.

[0191] Taking the example of a laser light source with i colors corresponding to the same positive electrode, FIG36 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in FIG36 , in some embodiments, the first end of the second switch component 706 can be connected to the display control module 701 (it should be understood that this is not shown in FIG36 ). The second end of the second switch component 706 can be connected to the positive electrode of the i-color laser light source included in the target laser; the third end of the second switch component 706 can be connected to the negative electrode of the i-color laser light source included in the target laser.

[0192] The target laser can be one of the two lasers included in the light source system. The laser other than the target laser can be the other of the two lasers included in the light source system other than the target laser. Exemplarily, the second switch assembly 706 can include at least one switching device. It should be understood that the present application does not limit the type of the switching device. For example, the switching device can be a MOS transistor. In Figure 36, the common anode three-color laser 7034 is the target laser, and the common anode three-color laser 7033 is the laser other than the target laser.

[0193] The timing of controlling the second switch component 706 to be turned on by the light source system is exemplified below:

[0194] In some embodiments, the display control module 701 may also be configured to receive an instruction to convert the brightness level to a target brightness level. In this implementation, the display control module 701 may respond to the instruction by outputting a third enable signal having the second value to the second switch component 706 to turn on the second switch component 706.

[0195] For example, the instruction for converting the brightness level to the target brightness level may be, for example, an instruction for enabling an overlap function of the light source system. The target brightness level may be, for example, pre-stored in the display control module 701. For example, the light source system may receive, through a brightness level setting interface, an instruction input by a user, via the display control module 701, to select the target brightness level for display, as the instruction for converting the brightness level to the target brightness level.

[0196] Through the above method, the light source system can respond to the user's operation to set the brightness level of the light source system. By turning on and off the second switch component 706, the brightness level can be switched, thereby improving the flexibility of the light source system and enhancing the user experience.

[0197] In some embodiments, the display control module 701 may also receive a laser light source failure alert from the laser driving module 702. In this implementation, the display control module 701 may respond to the laser light source failure alert by outputting a second enable signal at the second value to the second switch component 706, thereby turning on the second switch component 706.

[0198] Optionally, the present application does not limit how the laser driver module 702 determines whether the laser light source is faulty. Exemplarily, the laser driver module 702 may be integrated with any existing function for determining whether a laser light source is faulty, and the present application does not limit this. Furthermore, it should be understood that the present application does not limit how the display control module 701 receives a laser light source fault reminder from the laser driver module 702. For example, taking the example of the laser driver module 702 further including a fault pin, the display control module 701 may be connected to the fault pin of the laser driver module 702. The laser driver module 702 may, for example, send a laser light source fault reminder to the display control module 701 via the fault pin upon detecting a laser light source fault.

[0199] Through the above method, upon receiving a laser light source fault alert, the display control module 701 can output a second enable signal at the second value to the second switch component 706, thereby turning on the second switch component 706, thereby preventing the laser light source in at least one target laser among the N lasers from receiving a drive signal. The display control module 701 can then locate the specific failed laser light source based on whether the laser light source in the target laser still has a laser light source fault after not receiving a drive signal, thereby achieving automated fault detection for the light source system and further improving the flexibility of the light source system.

[0200] Taking the above-mentioned case where N is equal to 2, i is greater than 2, and the laser driver module 702 includes i driver units 7022 corresponding to i colors, FIG37 is a schematic diagram of the structure of another light source system provided by an embodiment of the present application. As shown in FIG37, in some embodiments, for any color, one end of the driver unit 7022 can be connected to the positive electrode of a laser light source of that color, and the other end can be connected to the negative electrode of another laser light source of that color. In some embodiments, after the second switch component 706 is turned on, if the display control module 701 receives a laser light source fault-free prompt message from the target driver unit 7022, indicating that the target laser is not receiving the drive signal and the fault has been resolved, the display control module 701 can determine that the laser light source fault prompt is caused by a fault in the laser light source of the corresponding color in the target driver unit 7022. That is, in FIG37, the laser light source of the corresponding color in the common cathode laser 7032 is faulty, while the laser light source of the corresponding color in the common cathode laser 7031 is fault-free. The display control module 701 can also continue to output the third enable signal at the second value to the second switch component 706 so that the faulty target laser does not receive the drive signal, thereby avoiding the use of the faulty target laser for projection equipment, so as to display the picture through the above-mentioned non-faulty laser (that is, the laser other than the target laser among the N lasers).

[0201] Optionally, the target driving unit 7022 may be any driving unit 7022 among the i driving units 7022 .

[0202] Optionally, after the target laser is deactivated and only the N lasers other than the target laser are used to display the image, the brightness of the light source system may decrease. Therefore, the light source system may also output a prompt message to inform the user that the target laser is faulty.

[0203] Through the above method, the target laser with a fault can be automatically detected and determined, and the driving signal is not output to the faulty target laser. The image is displayed only through the lasers other than the target laser among the N fault-free lasers. As a result, even if one laser fails, the light source system can automatically switch to displaying the image through a fault-free laser, thereby improving the user experience.

[0204] If the display control module 701 receives a laser light source fault reminder from the target drive unit 7022, indicating that the target laser does not receive the drive signal, the laser light source fault remains unresolved. Therefore, the faulty laser light source is not in the target laser. In other words, the laser light source of the corresponding color in the common cathode laser 7031 in Figure 37 is faulty. The display control module 701 can then determine that the laser light source of the corresponding color in the drive unit 7022 of the laser other than the target laser is faulty, and shut down the light source system.

[0205] Exemplarily, the light source system may also indicate a fault via an indicator light.

[0206] Through the above method, the faulty laser can be automatically detected and determined, thereby improving the fault detection efficiency and further enhancing the user experience.

[0207] The structures of the laser driving module 702 and the first switch component 705 are described below by way of example:

[0208] FIG38 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in FIG38 , in some embodiments, the laser driver module 702 may include: i driver units 7022 corresponding one-to-one to i colors. The first switch assembly 705 may include: i first switch units corresponding one-to-one to i colors, such as first switch unit 70501, first switch unit 70502, and first switch unit 70502 in FIG38 . For example, first switch unit 70501 corresponds to red, first switch unit 70502 corresponds to green, and first switch unit 70502 corresponds to blue.

[0209] For any color, the N lasers and the N laser light sources of that color are connected via the first switch unit corresponding to that color, forming a light-emitting module of that color. The first end of the driver unit 7022 corresponding to that color is connected to the first end of the light-emitting module, and the second end of the driver unit corresponding to that color is connected to the second end of the light-emitting module. The display control module 701 is connected to the first switch unit (it should be understood that the connection relationship between the display control module 701 and the first switch unit is not shown in Figure 8), and the third end of the driver unit 7022 is connected. Each light-emitting module corresponds to a color. Taking the light source system shown in Figure 38 as an example, the red laser light source R in the common cathode laser 7031 and the red laser light source R in the common cathode laser 7032 form a red light-emitting module, the green laser light source G in the common cathode laser 7031 and the green laser light source G in the common cathode laser 7032 form a green light-emitting module, and the blue laser light source B in the common cathode laser 7031 and the blue laser light source B in the common cathode laser 7032 form a blue light-emitting module.

[0210] For example, if the laser is a three-color laser, the laser driver module 702 may include three driver units 7022. The three driver units 7022 may correspond one-to-one to the three colors. For example, the driver unit 7022 may be the aforementioned constant current IC. For example, if the driver unit 7022 is a constant current IC, when the laser is a three-color laser, compared to the related art method of requiring six constant current ICs to drive three-color lasers in parallel, the present application only requires three constant current ICs, reducing the number of devices controlling the laser lighting and thereby reducing the space occupied by the light source system. For example, the first switch unit may include at least one switching device. It should be understood that the present application does not limit the type of the switching device. For example, the switching device may be a MOS transistor.

[0211] As mentioned above, the driving device can adjust the brightness of the light source system by adjusting the magnitude of the driving current input to the laser source. The following is an exemplary description of how the driving device adjusts the current:

[0212] As shown in FIG35 , in some embodiments, taking the example of a light source system including a first laser and a second laser, where both the first laser and the second laser are common cathode lasers, the light source system includes a first switch component 705 and a second switch component 706. The anode of each laser light source in the second laser is connected to the first end of the corresponding first switch component 705. The second ends of all first switch components 705 connected to the second laser are connected to the common cathode of the first laser and the first end of the second switch component 706, respectively, and the second end of the second switch component 706 is connected to the common cathode of the second laser. Thus, the light source system can use the first switch component 705 to control the on / off of the same-color laser light sources in adjacent first and second lasers, and use the second switch component 706 to control whether the second laser can receive a driving current.

[0213] As shown in FIG36 , in some embodiments, taking the example of a light source system including a third laser and a fourth laser, where both the third laser and the fourth laser are common anode lasers, the light source system includes a first switch component 705 and a second switch component 706. The cathode of each laser light source in the third laser is connected to the first end of the corresponding first switch component 705. The second ends of all first switch components 705 connected to the third laser are connected to the common anode of the fourth laser and the first end of the second switch component 706, respectively. The second end of the second switch component 706 is connected to the cathode of each laser light source in the third laser. Thus, the light source system can use the first switch component 705 to control the on / off of the same-color laser light sources in adjacent first and second lasers, and use the second switch component 706 to control whether the second laser can receive a driving current.

[0214] In some embodiments, the driving device may further include: a current adjustment module. Figure 39 is a schematic structural diagram of another light source system provided in an embodiment of the present application. As shown in Figure 39, illustratively, the current adjustment module may include: i current adjustment units 7023 corresponding one-to-one to the above-mentioned i colors. For example, current adjustment unit 7023a, current adjustment unit 7023b, and current adjustment unit 7023c in Figure 39. Exemplarily, current adjustment unit 7023a corresponds to red, current adjustment unit 7023b corresponds to green, and current adjustment unit 7023c corresponds to blue. In addition, Figure 39 also shows i driving units 7022 corresponding one-to-one to i colors, including driving unit 7022a corresponding to red, driving unit 7022b corresponding to green, and driving unit 7022c corresponding to blue.

[0215] For any color, the first end of the laser driving module 702 corresponding to that color can be connected to the first end of the current adjustment unit 7023 corresponding to that color. The second end of the current adjustment unit 7023 can be connected to the first end of the light-emitting module. The third end of the current adjustment unit 7023 can be connected to the second end of the light-emitting module. The fourth end of the current adjustment unit 7023 can be connected to the fourth end of the driving unit 7022 corresponding to that color.

[0216] Taking the control signal including: an enable signal and a dimming signal as an example, in this implementation, the above-mentioned driving unit 7022 can be used to respond to the enable signal and control the driving current output to the light-emitting module by the current adjustment unit 7023 based on the dimming signal from the display control module 701.

[0217] The current adjustment module allows the driver to adjust the current output to the laser light source, thereby adjusting the brightness of the light source system. The number of current adjustment units can be the same as the number of colors of the laser light source included in the laser. That is, taking a three-color laser as an example, the light source system provided by this application only requires three current adjustment units. Compared to the related art method that requires six sets of identical components for current adjustment, this light source system further reduces the number of components and the space occupied by the light source system, thereby further miniaturizing the light source system.

[0218] Figure 40 is a schematic diagram of the structure of a current adjustment unit provided in an embodiment of the present application. As shown in Figure 40, in some embodiments, the current adjustment unit may include: an inductor L, a diode D, and a third switch component S. The first end of the inductor L can be connected to the first end of the driving unit 7022 corresponding to the color and the cathode of the diode D. The second end of the inductor L can be connected to the first end of the light-emitting module (for example, the laser 7031 in Figure 40). The first end of the third switch component S can be connected to the second end of the light-emitting module (for example, the laser 7032 in Figure 40) and the anode of the diode D. The second end of the third switch component S can be connected to the fourth end of the driving unit 7022 corresponding to the color.

[0219] For example, the inductor can refer to any existing energy storage inductor in a current adjustment unit, and this application is not limited to this. The diode can be, for example, a voltage regulator diode. The third switch component S can include, for example, at least one switching device. For example, the switching device can be, for example, a MOS transistor, and this application is not limited to this.

[0220] Optionally, for any driving device, the driving unit, third switch component, diode, and inductor included in the driving device can form a buck structure. This buck structure can be used to reduce the input voltage to a voltage level suitable for laser operation. Optionally, the specific implementation of the buck structure can refer to any existing implementation method and is not further described here.

[0221] Using the above-mentioned current adjustment units, taking a three-color laser as an example, the light source system only needs three current adjustment units to control the three-color lasers. Accordingly, only three inductors, three diodes, etc. are required. Therefore, compared to the related art implementation method that requires six inductors and six diodes to control three-color lasers, the present application further reduces the number of components and the space occupied by the light source system, thereby further miniaturizing the light source system.

[0222] In some embodiments, the driving device may further include a sampling module. The sampling module may include i second sampling resistors 7024 corresponding to the i colors. Figure 41 is a schematic diagram of the structure of another current adjustment unit provided in an embodiment of the present application. As shown in Figure 41, for any color, the third terminal of the third switch component S is optionally grounded via the second sampling resistor 7024 corresponding to that color.

[0223] It should be understood that the present application does not limit the resistance value of the second sampling resistor 7024. The resistance values ​​of the second sampling resistors 7024 corresponding to different colors can be the same or different, and the present application does not limit this.

[0224] Using the above method, still taking a three-color laser as an example, the light source system only needs to include three second sampling resistors. Compared to the related art implementation method that requires six sampling resistors to control a three-color laser, this application further reduces the number of components and the space occupied by the light source system, thereby further miniaturizing the light source system.

[0225] The light source system provided in this application is described below by taking the light source system including two three-color lasers as an example:

[0226] Taking the aforementioned three-color lasers with a common anode as an example, Figure 42 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. Taking the aforementioned three-color lasers with a common cathode as an example, Figure 43 is a schematic diagram of the structure of another light source system provided in an embodiment of the present application. As shown in Figures 42 and 43, the constant current ICs (N1, N2, and N3) can also be connected to the AC-DC power supply 800 via the VCC pin.

[0227] As shown in Figures 42 and 43, the display control module 701 can be a DLP or a SOC. The driving unit can be, for example, a constant current IC. The display control module 701 can output a dimming signal (i.e., the aforementioned laser drive signal) to the constant current IC via the Dimming pin of the constant current IC, and output an enable signal via the EN pin (i.e., the enable pin) of the constant current IC. The constant current IC can provide feedback to the display control module 701 via the fault pin (i.e., the fault signal feedback pin) indicating whether the laser light source is faulty.

[0228] The third switch component S can be, for example, the MOS transistor M1, MOS transistor M2, and MOS transistor M3 shown in Figures 42 and 43. The constant current IC can be connected to the third switch component S via the DRV pin, and output a MOS drive signal to the third switch component S through the DRV pin to control the conduction or closure of the third switch component S. The diode D included in the current adjustment unit 7023 can be, for example, D1, D2, and D3 shown in Figures 42 and 43, and the inductor L can be L1, L2, and L3 shown in Figures 42 and 43. The second sampling resistor 7024 can be the resistors R1, R2, and R3 shown in Figures 42 and 43; the constant current IC can be connected to the second sampling resistor 7024 via the FB (signal feedback) pin. GND represents ground. Laser1 and Laser2 represent lasers, R-1 represents the red laser of Laser1, G-1 represents the green laser of Laser1, and B-1 represents the blue laser of Laser1; R-2 represents the red laser of Laser2, G-2 represents the green laser of Laser2, and B-2 represents the blue laser of Laser2. The first switch unit may be, for example, the MOS transistors M4, M5, and M6 shown in Figures 42 and 43. The second switch component 706 may be, for example, the MOS transistor M7.

[0229] In some embodiments, the light source system has a first switch component 705, a second switch component 706 and a third switch component S; the first switch component 705, the second switch component 706 or the third switch component S is at least one of a triode and a metal-oxide semiconductor field effect transistor (MOS).

[0230] Taking the above-mentioned light source system applied to a laser TV as an example, based on the light source system shown in Figures 42 and 43, in some embodiments, by controlling the timing of the laser drive signal and the enable signal, the driving unit, current adjustment unit, and first switch component can be used to control the red light-emitting module, the green light-emitting module, and the blue light-emitting module to alternately emit light. The length of the duty timing can also be controlled to control the light-emitting duration of different light-emitting modules. It should be understood that the lighting order of different color laser light sources can be changed according to actual needs, and this application does not limit this.

[0231] In some embodiments, by controlling the timing of the drive signal and the enable signal, the drive unit, current adjustment unit, and second switch assembly are used to control laser Laser2 so that it does not receive the drive current, while laser Laser1 emits light. In some embodiments, the drive units and current adjustment units corresponding to two or more colors can also be controlled to operate simultaneously, controlling two or more laser light sources corresponding to two or more colors in laser Laser1 to emit light simultaneously, thereby achieving the overlap function of the light source system.

[0232] In this embodiment, taking a three-color laser as an example, compared to the laser parallel scheme in the related art, this application uses a common cathode or common anode series connection method, and uses a three-way driver chip to drive two series common cathode or common anode circuits, saving at least three driver chips (constant current ICs), three energy storage inductors, three groups of current sampling resistors, three diodes, and the peripheral circuits of the above devices, further realizing the miniaturization of the light source system, and realizing the overlap function through timing control. In addition, for a laser2 laser failure condition, this application can display the picture through the laser1 laser. In addition, in this application, only the three MOS tubes M1-M3 are in the high-speed switching stage, which reduces EMC radiation and reduces electromagnetic radiation problems.

[0233] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0234] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A light source system, wherein: The light source system comprises: a display control module, a laser driving module and a laser module; the laser module comprises at least one laser; The driving signal output terminal of the display control module is connected to the driving signal receiving terminal of the laser driving module, the enabling signal output terminal of the display control module is connected to the enabling signal receiving terminal of the laser driving module, and the driving current output terminal of the laser driving module is connected to the at least one laser; The display control module is used to determine at least one laser driving signal, and output the at least one laser driving signal and at least one first enabling signal to the laser driving module; the laser driving signal is used to characterize the magnitude of the driving current corresponding to the target color displayed by the at least one laser; The laser driving module is used to respond to the at least one first enabling signal, adjust the driving current according to the at least one laser driving signal, and output the adjusted driving current to the at least one laser to light up the at least one laser.

2. The light source system according to claim 1, wherein: The light source system further comprises: a feedback compensation module; a first end of the feedback compensation module is connected to the at least one laser, and a second end of the feedback compensation module is connected to the laser driving module; The feedback compensation module is used to filter the driving current corresponding to the abnormal signal in the laser driving signal to obtain a laser feedback signal; output the laser feedback signal to the laser driving module; and the laser driving module is used to adjust the driving current according to the laser feedback signal and the laser driving signal.

3. The light source system according to claim 2, wherein: The feedback compensation module comprises: a filtering unit and an amplifying unit, wherein a first end of the amplifying unit is connected to the at least one laser, a second end of the amplifying unit is connected to the first end of the filtering unit and the laser driving module, and a second end of the filtering unit is grounded; The amplifying unit is used to convert the driving current flowing through the at least one laser into a voltage signal and amplify the voltage signal to output the amplified voltage signal to the filtering unit; the filtering unit is used to filter the driving current corresponding to the abnormal signal based on the amplified voltage signal to obtain the laser feedback signal.

4. The light source system according to claim 3, wherein: The amplification unit comprises: a transconductance amplifier; The first end of the transconductance amplifier is connected to the cathode of the at least one laser, and the second end of the transconductance amplifier is connected to the first end of the filter unit and the feedback signal detection end of the laser driving module.

5. The light source system according to claim 4, wherein: The filtering unit comprises a first filtering subunit and a second filtering subunit, a first end of the first filtering subunit, a first end of the second filtering subunit, and a second end of the amplifying unit are all connected to the feedback signal detection end, and a second end of the first filtering subunit and a second end of the second filtering subunit are both grounded; The first filtering subunit is used to filter the driving current corresponding to the abnormal signal whose frequency is less than or equal to the first frequency in the abnormal signal; the second filtering subunit is used to filter the driving current corresponding to the abnormal signal whose frequency is greater than the first frequency and less than or equal to the second frequency in the abnormal signal.

6. The light source system according to claim 5, wherein: The first filtering subunit includes: a first resistor and a first capacitor, wherein a first end of the first resistor is connected to the feedback signal detection end; and a second end of the first resistor is grounded through the first capacitor.

7. The light source system according to claim 6, characterized in that: The first frequency and the second frequency are related to the resistance value of the first resistor, the transconductance coefficient of the transconductance amplifier, and the capacitance value of the first capacitor.

8. The light source system according to claim 6 or 7, wherein: The frequency of the laser driving signal is greater than twice the second frequency.

9. The light source system according to claim 6 or 7, wherein: The second filtering subunit includes: a second capacitor, a first end of the second capacitor is connected to the feedback signal detection end; and a second end of the second capacitor is grounded.

10. The light source system according to any one of claims 1 to 9, characterized in that: The display control module includes a display control unit and a selection switch unit; The first signal output terminal of the display control unit is connected to the first signal input terminal of the selection switch unit, the enable signal output terminal of the display control unit is connected to the enable signal input terminal of the selection switch unit and the enable signal receiving terminal of the laser driving module, and the selection signal output terminal of the selection switch unit is connected to the driving signal receiving terminal of the laser driving module; When the laser module includes one laser, the display control unit is used to determine a plurality of dimming analog signals based on a video signal to be displayed; and output the plurality of dimming analog signals and a third enable signal to the selection switch unit; the selection switch unit synthesizes the plurality of dimming analog signals in response to the third enable signal to obtain one laser driving signal; or, When the laser module includes a laser, the display control unit is used to determine the multi-channel dimming digital signal based on the video signal to be displayed; and output the multi-channel dimming digital signal and the third enable signal to the selection switch unit; the selection switch unit responds to the The third enable signal is used to synthesize the multiple dimming digital signals to obtain one channel of the laser driving signal.

11. The light source system according to any one of claims 1 to 10, wherein: The laser module comprises at least two lasers, and the at least two lasers are arranged in series; The light source system further comprises at least one first switch component, and the at least two lasers are connected via the first switch component.

12. The light source system according to claim 11, wherein: The at least two lasers are both common cathode lasers or common anode lasers.

13. The light source system according to claim 12, wherein: The at least one first switch component is located in the laser module, and the laser driving module includes at least two constant current components; The display control module is connected to the at least two constant current components respectively, and is used to output the at least one laser driving signal and the at least one first enabling signal to the at least two constant current components; the constant current component is used to drive the at least two lasers to emit light according to the laser driving signal when the received first enabling signal is a valid potential; The display control module is respectively connected to the at least one first switch component, and is used to output a second enable signal to the at least one first switch component; The at least one first switch component is used to turn on the at least two lasers when the received second enable signal is at a valid potential.

14. The light source system according to claim 13, wherein: Each of the lasers includes at least two laser light sources corresponding to different colors, and the laser light sources of the same color in all the lasers are sequentially connected in series to one of the constant current components, and a first switch component is provided between two adjacent laser light sources.

15. The light source system according to claim 13 or 14, wherein: The constant current component includes a constant current chip, a voltage regulating component and a first sampling resistor; the display control module is respectively connected to the constant current chips in the at least two constant current components; the constant current chip is connected to the voltage regulating component, the constant current chip and the voltage regulating component are connected to one end of the first sampling resistor, the other end of the first sampling resistor is grounded, and the voltage regulating component is connected to the laser module.

16. The light source system according to claim 15, wherein: The voltage regulating component is at least one of a Buck circuit, a Boost circuit, and a Buck-Boost circuit.

17. A light source system according to claims 13 to 16, wherein: The display control module determines a laser operation period, a target first switch component in the at least one first switch component, and a target constant current component in the at least two constant current components; During the laser operation period, controlling the second enable signal output to the target first switch component and the first enable signal output to the target constant current component to be effective potentials; When the received second enable signal is at a valid potential, the target first switch component turns on the two lasers connected to the target first switch component; When the first enable signal received by the target constant current component is a valid potential, the drive current is output to the laser module according to the laser drive signal. The drive current flows through each of the lasers in the laser module and the target first switch component and then flows back to the target constant current component, and each of the lasers emits light.

18. The light source system according to claim 11 or 12, wherein: Each of the lasers includes laser light sources of i colors, and the laser light sources of i colors correspond to the same positive electrode or the same negative electrode; i is an integer greater than or equal to 2; The at least one first switch assembly and the laser driving module are located in a driving device; The display control module is used to output the first enable signal corresponding to the i colors to the laser driving module, and output the second enable signal corresponding to the i colors to the at least one first switch component; For any of the colors, the laser driving module is used to output the driving current to the laser light source of the color when the first enable signal corresponding to the color is the target value; the first switch component is used to enable conduction between the laser light sources of the color when the second enable signal corresponding to the color is the target value, so that the laser light source of the color receives the driving current and lights up.

19. The light source system according to claim 18, wherein: The driving device also includes: a second switch component; the display control module is further used to output a third enable signal to the second switch component; the second switch component is turned on when the third enable signal is a second value, so that the laser light source in at least one target laser of the at least two lasers does not receive the driving current.

20. The light source system according to claim 19, wherein: The display control module is also used for: receiving an instruction to convert the brightness level to a target brightness level; In response to the instruction, the third enable signal at the second value is output to the second switch component.

21. The light source system according to claim 19, wherein: The display control module is also used for: Receiving a laser light source failure reminder from the laser driving module; In response to the laser light source failure reminder, the third enable signal at the second value is output to the second switch component.

22. The light source system according to claim 21, wherein: The number of the lasers is two, and i is greater than 2. The laser driving module includes: i driving units corresponding to the i colors one by one. After the second switch component is turned on, the display control module is further used to: If a laser light source failure reminder is received from the target drive unit, it is determined that the laser light source of the corresponding color of the target drive unit in the target laser is faulty, and the third enable signal at the second value is continuously output to the second switch component, so as to display a picture through the laser other than the target laser among the at least two lasers; If a laser light source failure reminder is received from the target drive unit, it is determined that the laser light source of the corresponding color of the target drive unit in the lasers other than the target laser among the at least two lasers is faulty, and the light source system is turned off.

23. The light source system according to any one of claims 20 to 22, characterized in that: The number of the lasers is two, and i is greater than 2, and the first end of the second switch component is connected to the display control module; If the i-color laser light sources included in the laser correspond to the same cathode, the second end of the second switch component is connected to the cathode of the i-color laser light sources included in the laser other than the target laser; the third end of the second switch component is connected to the cathode of the i-color laser light sources included in the target laser; or, If the i-color laser light sources included in the laser correspond to the same positive pole, the second end of the second switch component is connected to the positive pole of the i-color laser light sources included in the target laser; the third end of the second switch component is connected to the negative pole of the i-color laser light sources included in the target laser.

24. The light source system according to any one of claims 18 to 23, wherein: The laser driving module comprises: i driving units corresponding to the i colors one by one; the first switch component comprises: i first switch units corresponding to the i colors one by one; For any of the colors, the at least two lasers and the laser light sources of the color are connected through the first switch unit corresponding to the color to form a light-emitting module of the color; the first end of the driving unit corresponding to the color is connected to the first end of the light-emitting module, and the second end of the driving unit corresponding to the color is connected to the second end of the light-emitting module; the display control module is connected to the first switch unit and the third end of the driving unit.

25. The light source system according to claim 24, wherein: The driving device further includes: a current adjustment module, the current adjustment module including: i current adjustment units corresponding to the i colors one by one, for any of the i colors: The first end of the driving unit corresponding to the color is connected to the first end of the current adjustment unit corresponding to the color, the second end of the current adjustment unit is connected to the first end of the light-emitting module, the third end of the current adjustment unit is connected to the second end of the light-emitting module; the fourth end of the current adjustment unit is connected to the fourth end of the driving unit corresponding to the color; The driving unit is used to control the driving current output by the current adjustment unit to the light-emitting module based on the laser driving signal from the display control module.

26. The light source system according to claim 25, wherein: The current adjustment unit includes: an inductor, a diode and a third switch component; the first end of the inductor is connected to the first end of the driving unit corresponding to the color and the cathode of the diode, and the second end of the inductor is connected to the first end of the light-emitting module; the first end of the third switch component is connected to the second end of the light-emitting module and the anode of the diode, and the second end of the third switch component is connected to the fourth end of the driving unit corresponding to the color.

27. The light source system according to claim 26, wherein: The driving device further includes: a sampling module; the sampling module includes: i second sampling resistors corresponding to the i colors one by one; for any of the colors: The third end of the third switch component is grounded through the second sampling resistor corresponding to the color.

28. The light source system according to any one of claims 11 to 27, wherein: The at least two lasers are common cathode lasers; For a first laser and a second laser in two lasers connected in series, an anode of each laser light source in the second laser is respectively connected to a first end of the corresponding first switch component; The second ends of all the first switch components connected to the second laser are connected to the common cathode of the first laser.

29. The light source system according to claim 28, wherein: The light source system comprises a first switch component and a second switch component; The anode of each laser light source in the second laser is respectively connected to the first end of the corresponding first switch component; The second ends of all the first switch components connected to the second laser are respectively connected to the common cathode of the first laser and the first end of the second switch component, and the second ends of the second switch components are connected to the common cathode of the second laser.

30. The light source system according to any one of claims 11 to 27, wherein: The multiple lasers are common anode lasers; For the third laser and the fourth laser in the two lasers connected in series, the cathode of each laser light source in the third laser is respectively connected to the first end of the corresponding first switch component; The second ends of all the first switch components connected to the third laser are connected to the common anode of the fourth laser.

31. The light source system according to claim 30, characterized in that: The light source system comprises a first switch component and a second switch component; the cathode of each laser light source in the third laser is respectively connected to the first end of the corresponding first switch component; The second ends of all the first switch components connected to the third laser are respectively connected to the common anode of the fourth laser and the first end of the second switch component, and the second end of the second switch component is connected to the cathode of each laser light source in the third laser.

32. The light source system according to any one of claims 11 to 31, wherein: The light source system comprises a first switch component, a second switch component and a third switch component; the first switch component, the second switch component or the third switch component is at least one of a triode and a metal-oxide semiconductor field effect transistor (MOS).

33. A laser projection device, wherein: The laser projection device comprises the light source system according to any one of claims 1 to 32.

34. The laser projection device according to claim 33, wherein: The laser projection device also includes an optical-mechanical system and a lens system. The light source system provides a laser beam, which is transmitted to the optical-mechanical system. The optical-mechanical system modulates the laser beam and transmits it to the lens system. The lens system projects the modulated laser beam onto a projection screen to display an image.

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