Laser projection equipment, control method and laser driving module

Abstract

The invention provides laser projection equipment, a control method and a laser driving module. The laser projection equipment comprises a laser light source, a light modulation device, a projection lens, a display control module, a power panel and at least one laser driving module, and the power panel is used for outputting power supply input voltage through the output end of the power panel; the input end of the laser driving module is connected with the output end of the power panel and the negative electrode of the corresponding laser, and the output end of the laser driving module is connected with the positive electrode of the corresponding laser; the laser driving module is used for outputting power supply output voltage through the output end of the laser driving module based on the power supply input voltage, the dimming signal and the driving current of the corresponding laser; the power supply output voltage is not less than the power supply input voltage. The difference value between the power supply input voltage and the power supply voltage at the two ends of the laser can be reduced, so that the current or voltage of partial elements in the laser driving module can be reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a laser projection device, a control method and a laser driving module. Background Art

[0002] Laser projection equipment uses digital light processing (DLP) technology to digitally process image signals and then project them through a laser beam. Laser projection equipment has the characteristics of bright colors, high brightness, and flexible screen size, and has been widely used. Laser projection equipment includes monochrome, dual-color, and tri-color lasers. Each laser is powered by a corresponding laser driver module. The laser driver module is a DC-DC conversion circuit, which can be a boost circuit or a buck circuit.

[0003] In the related art, in order to improve the uniformity of the circuit, the laser driving modules corresponding to different lasers are usually set to the same circuit, that is, they are all step-up circuits, or they are all step-down circuits. The voltage output by the laser driving module is the supply voltage at both ends of the corresponding laser, and the brightness of the laser is adjusted by adjusting the output voltage of the laser driving module.

[0004] However, in actual applications, the brightness of different lasers is different and the difference is large, so the power supply voltages at both ends of different lasers will also be very different. In applications where the laser driving module is a boost circuit, it is necessary to set the power supply input voltage based on the power supply voltage at both ends of the laser with the lowest brightness, so that the power supply voltage at both ends of the high-brightness laser will differ greatly from the power supply input voltage, and the output power of the power board is certain, so some components in the laser driving module will bear a large current; and in applications where the laser driving module is a boost circuit, it is necessary to set the power supply input voltage based on the power supply voltage at both ends of the laser with the highest brightness, so that the power supply voltage at both ends of the low-brightness laser will also differ greatly from the power supply input voltage, and some components in the laser driving module will bear a large current. In other words, the difference between the power supply input voltage and the power supply voltage at both ends of the laser in the related art is large, resulting in a higher current or voltage of some components in the laser driving module, which reduces the service life of the laser driving module. Summary of the invention

[0005] The present application provides a laser projection device, a control method and a laser driving module, which are used to solve the problem that the difference between the power supply output voltage of the laser driving module and the power supply voltage of the corresponding laser is large, resulting in a high current or voltage of some components in the laser driving module.

[0006] In a first aspect, the present application provides a laser projection device, comprising: a laser light source, a light modulation device, a projection lens, a display control module, a power supply board, and at least one laser driving module, wherein the laser light source comprises at least one laser for emitting a laser beam to provide an illumination beam for the device; the at least one laser corresponds to the at least one laser driving module one by one; the display control module is used to output a dimming signal and an image display driving signal for driving the light modulation device; the light modulation device modulates the laser beam under the drive of the image display driving signal; the projection lens is used to receive the modulated laser beam and project an image; the power supply board is used to output a power supply input voltage through the output end of the power supply board; the input end of the laser driving module is connected to the output end of the power supply board and the negative pole of the corresponding laser, and the output end of the laser driving module is connected to the positive pole of the corresponding laser; the laser driving module is used to output a power supply output voltage based on the power supply input voltage, the dimming signal and the driving current of the corresponding laser, and through the output end of the laser driving module; the power supply output voltage is not less than the power supply input voltage.

[0007] In some embodiments, the laser driving module includes: a sampling unit, a controller and a driving unit; the sampling unit is connected to the laser corresponding to the laser driving module where the sampling unit is located and the controller, and is used to sample the driving current of the corresponding laser; the controller is connected to the driving unit and the display control module, and is used to generate a driving signal based on the dimming signal and the driving current of the corresponding laser; the input end of the driving unit is connected to the output end of the power board and the negative pole of the corresponding laser, the output end of the driving unit is connected to the positive pole of the corresponding laser, and the driving unit is used to output a power supply output voltage based on the driving signal and the power supply input voltage.

[0008] In some embodiments, the drive signal is a PWM signal; the controller is used to obtain a reference drive current of the corresponding laser based on the dimming signal; and is also used to output a first drive signal with a duty cycle greater than 0.5 when the reference supply voltage is greater than the power input voltage; and, when the reference supply voltage is not greater than the power input voltage, output a second drive signal with a duty cycle not greater than 0.5; the reference supply voltage is the voltage across the corresponding laser when the reference supply current is reached; the drive unit is used to output a first power output voltage when receiving the first drive signal, and the difference between the first power output voltage and the power input voltage is greater than the power input voltage; and, when receiving the second drive signal, output a second power output voltage, and the difference between the second power output voltage and the power input voltage is not greater than the power input voltage.

[0009] In some embodiments, the controller is further used to reduce the duty cycle of the drive signal when the drive current of the corresponding laser is greater than the reference drive current so as to reduce the power output voltage output by the drive unit; the controller is further used to increase the duty cycle of the drive signal when the drive current of the corresponding laser is not greater than the reference drive current so as to increase the power output voltage output by the drive unit.

[0010] In some embodiments, the driving unit includes: a first inductor, a first diode, a first switch tube and a first capacitor; one end of the first inductor is connected to the output end of the power board, and the other end of the first inductor is connected to the positive electrode of the first diode and one end of the first switch tube; the negative electrode of the first diode is connected to the positive electrode of the first capacitor, and the negative electrode of the first capacitor is grounded; the other end of the first switch tube is grounded, and the control end of the first switch tube is connected to the controller.

[0011] In some embodiments, the sampling unit includes: a first resistor; one end of the first resistor is connected to the positive electrode of the corresponding laser and the controller, and the other end of the first resistor is connected to the negative electrode of the first diode and the controller.

[0012] In a second aspect, the present application provides a control method for a laser projection device, the laser projection device comprising: a laser light source, a light modulation device, a projection lens, a display control module, a power supply board, and at least one laser driving module, the laser light source comprising at least one laser, and the at least one laser corresponding to the at least one laser driving module one by one; the method comprising: the laser emitting a laser beam to provide an illumination beam for the device; the display control module outputting a dimming signal and an image display driving signal for driving the light modulation device; the light modulation device modulating the laser beam under the drive of the image display driving signal; the projection lens receiving the modulated laser beam and projecting an image; the power supply board outputting a power supply input voltage through an output end of the power supply board; the output end of the power supply board being connected to an input end of the at least one laser driving module; the input end of the laser driving module being connected to a negative electrode of a corresponding laser, and the output end of the laser driving module being connected to a positive electrode of the corresponding laser; the laser driving module outputting a power supply output voltage based on the power supply input voltage, the dimming signal and a driving current of the corresponding laser, and through the output end of the laser driving module; the power supply output voltage is not less than the power supply input voltage.

[0013] In some embodiments, the laser driving module includes: a sampling unit, a controller and a driving unit; the laser driving module outputs the power supply output voltage based on the power supply input voltage, the dimming signal and the corresponding laser driving current, and through the output end of the laser driving module, including: the sampling unit samples the corresponding laser driving current; the controller generates a driving signal based on the dimming signal and the corresponding laser driving current; the input end of the driving unit is connected to the output end of the power board and the negative pole of the corresponding laser, and the output end of the driving unit is connected to the positive pole of the corresponding laser; the driving unit outputs the power supply output voltage based on the driving signal and the power supply input voltage.

[0014] In some embodiments, the driving signal is a PWM signal; the controller generates a driving signal based on the dimming signal and the driving current of the corresponding laser, including: the controller obtains a reference driving current of the corresponding laser based on the dimming signal; the controller outputs a first driving signal with a duty cycle greater than 0.5 when the reference supply voltage is greater than the power input voltage; and, when the reference supply voltage is not greater than the power input voltage, the controller outputs a second driving signal with a duty cycle not greater than 0.5; the reference supply voltage is the voltage across the corresponding laser when the reference supply current is reached; the driving unit outputs a power output voltage based on the driving signal and the power input voltage, including: when the driving unit receives the first driving signal, the driving unit outputs a first power output voltage, and the difference between the first power output voltage and the power input voltage is greater than the power input voltage; and when the second driving signal is received, the driving unit outputs a second power output voltage, and the difference between the second power output voltage and the power input voltage is not greater than the power input voltage.

[0015] In a third aspect, the present application provides a laser driving module, including: a sampling unit, a controller and a driving unit;

[0016] The sampling unit is connected to the corresponding laser and the controller, and is used to sample the driving current of the corresponding laser;

[0017] The controller is connected to the driving unit and the display control module, and is used to generate a driving signal based on the dimming signal sent by the display control module and the driving current of the corresponding laser;

[0018] The input end of the driving unit is connected to the output end of the power board and the negative pole of the corresponding laser, and the power board is used to output the power supply input voltage through the output end of the power board; the output end of the driving unit is connected to the positive pole of the corresponding laser, and the driving unit is used to output the power supply output voltage based on the driving signal and the power supply input voltage and through the output end of the driving unit.

[0019] In the laser projection device, control method and laser driving module provided by the present embodiment, the input end of the laser driving module is connected to the output end of the power board and the negative electrode of the corresponding laser, and the output end of the laser driving module is connected to the positive electrode of the corresponding laser. The laser driving module is used to output the power supply output voltage based on the power supply input voltage, the dimming signal and the corresponding laser driving current, and through the output end of the laser driving module, the power supply output voltage is not less than the power supply input voltage. In this scheme, by connecting the input end of the laser driving module to the negative electrode of the laser, and the output end of the laser driving module to the positive electrode of the corresponding laser, the power supply voltage at both ends of the laser is the difference between the power supply output voltage and the power supply input voltage, and the power supply output voltage is not less than the power supply input voltage. In this way, the power supply voltage range at both ends of the laser can be 0 to infinity, so that the setting of the power supply input voltage will no longer be limited by the minimum or maximum voltage of the laser, and then the difference between the power supply input voltage and the power supply voltage at both ends of the laser can be reduced, so that the current or voltage of some components in the laser driving module can be reduced, and the service life of the laser driving module can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the embodiments of the present application, and together with the description are used to explain the principles of the embodiments of the present application.

[0021] The above drawings have shown clear embodiments of the embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the embodiments of the present application in any way, but to illustrate the concepts of the embodiments of the present application for those skilled in the art by referring to specific embodiments.

[0022] Figure 1 A schematic diagram of a laser projection device provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a circuit structure of a laser projection device according to an embodiment;

[0024] Figure 3 It is a structural schematic diagram of a laser projection device in the related art;

[0025] Figure 4A schematic diagram of the structure of a laser projection device provided in one embodiment of the present application;

[0026] Figure 5 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application;

[0028] Figure 7 A schematic diagram of the structure of a laser driving module provided in an embodiment of the present application;

[0029] Figure 8 A schematic flow chart of a control method for a laser projection device provided in an embodiment of the present application;

[0030] Fig. 9 A schematic flow chart of another method for controlling a laser projection device provided in an embodiment of the present application;

[0031] Fig.10 A schematic diagram of the hardware structure of the electronic device provided in this application.

[0032] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0034] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0035] The terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise indicated. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, for example, they can be implemented in an order other than those given in the diagrams or descriptions of the embodiments of this application.

[0036] In addition, the terms "including" and "having" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components explicitly listed, but may include other components not explicitly listed or inherent to such products or devices. The term "circuitry" as used in this application refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with the element.

[0037] Explanation of the terms involved in this application:

[0038] PFC (Power Factor Correction): Power factor correction, power factor refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power to total power consumption (apparent power). The basic operating principle of PFC voltage-stabilized switching power supply is to use inductor compensation method to adjust the input current waveform to make it as similar as possible to the input voltage waveform, and the power factor correction value approaches 100%.

[0039] LLC: A resonant circuit that achieves a constant output voltage by controlling the switching frequency (frequency regulation). When a single-port network containing inductors, capacitors, and resistors has the same phase as the port voltage and current waveforms at certain operating frequencies, the circuit is said to resonate. A circuit that can resonate is called a resonant circuit.

[0040] Rectifier bridge circuit: It is the most widely used rectifier circuit in power circuits. It consists of 4 diodes with the same direction and a transformer. Rectification is the process of converting AC into DC. Using devices with unidirectional conductive properties, AC with changed direction and magnitude can be converted into DC.

[0041] The following is an exemplary description of the architecture and imaging principle of the laser projection device.

[0042] Figure 1 Schematic diagram of a laser projection device provided in an embodiment of the present application. Figure 1As shown, 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 100, an optical machine 200, and a lens 300, wherein the light source 100 is used to provide a light source illumination beam, which is transmitted to the rear-end optical modulation device and the projection lens. The light source 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 red, green, and blue lasers, for providing a three-color laser illumination beam.

[0043] The laser beam provided by the light source 100 enters the illumination optical path of the optical machine 200 after light combination and shaping. In the DLP projection architecture, the DMD chip is the core optical modulation device. The DMD chip receives the driving control signal corresponding to the image signal, and flips the thousands of tiny mirrors on its surface to the positive or negative angle corresponding to the driving signal, and reflects the light beam irradiating its surface into the lens 300.

[0044] The lens 300 may be an ultra-short-throw projection lens, and the ultra-short-throw projection lens 300 is used to project an image beam onto a projection screen, thereby realizing projection image display. The laser projection device in the above example may be an ultra-short-throw laser projection device.

[0045] Based on the above Figure 1 Example laser projection device structure, Figure 2 A schematic diagram of a circuit architecture of a laser projection device according to an embodiment is shown.

[0046] like Figure 2 As shown, the laser projection device includes: a display panel 001, a power panel 10, and a TV panel 003. Among them, the power panel 10 is connected to the display panel 001 and the TV panel 003 respectively, and can be used to power various devices or partial modules on the display panel 001 and the TV panel 003. At the same time, it can also power other functional modules in the laser projection device, such as the human eye protection module, the fan, the WIFI module, etc., to ensure the normal power supply of various parts of the laser projection device. In some specific implementations, a laser driving module can also be provided on the power panel 10. Alternatively, the laser driving module can also be provided independently of the power panel 10.

[0047] TV board 003 is mainly used for decoding external audio and video signals and outputting video image signals.

[0048] The TV panel 003 is provided with a system on chip (SoC), which can decode data in different data formats into a normalized format, and transmit the data in the normalized format to the display panel 001 through, for example, a connector.

[0049] The video image signal output by the TV panel 003 is transmitted to the display panel 001 .

[0050] The display panel 001 may be provided with a Field Programmable Gate Array (FPGA) and an algorithm processing module FPGA, which are used to process the input video image signal, such as performing MEMC frequency multiplication processing, or image correction, etc. to realize the image enhancement function. The display control module 20 is connected to the algorithm processing module FPGA, and is used to receive the processed video image processing signal data as the image data to be displayed. It should be noted that FPGA usually exists as an enhancement function module. In some low-cost solutions, this module part may not be provided, and the display control module 20 receives the video image display signal output by the TV panel 003.

[0051] The display panel 001 is used to generate an initial driving signal for driving the laser and an image display driving signal for driving the light modulation device.

[0052] The display control module 20 mainly includes a digital light processing chip (Digital Light Processing, DLP), and may also include a driving chip.

[0053] In the DLP control architecture, the light source part needs to cooperate with the working timing of the DLP chip and the DMD chip. Specifically, the DLP chip outputs an image enable signal, which can also be called a primary color light enable signal, usually expressed as X_EN, where X is the abbreviation of different primary color lights, and also outputs a dimming signal, referred to as a PWM signal. Along with the DMD chip's sequential modulation process of different primary color image components, the light source part needs to synchronously output the primary color light beams of the corresponding colors. That is, the DLP chip outputs a primary color light enable signal to notify the laser light source to enable the lighting of a certain color laser, and outputs a PWM signal to notify a certain laser in the laser light source to light up at what brightness.

[0054] Corresponds to Figure 2 As shown, the display control module 20 is used to generate an image display driving signal for driving the light modulator 50 according to the image signal to be displayed. On the other hand, since the display of the projection image requires the synchronous coordination of the light source light beam and the light modulator, the display control module 20 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 current PWM signal, wherein the initial image enable signal EN is a timing control signal for coordinating the timing of light outputs of different colors, and the current PWM signal is a periodic square wave signal for providing a current signal for lighting the laser.

[0055] as well as, Figure 2 The circuit architecture diagram of the laser projection device shown also includes a laser driving module 30, which is used to receive the image enable signal EN and the current PWM signal output by the display control module 20, as well as the power supply input voltage of the power board, and directly control the lighting of the laser 40, wherein the current PWM signal includes a dimming signal.

[0056] In the figure, the laser 40 can be a monochromatic laser or a multi-color laser, such as a two-color laser including a red laser and a blue laser, or a three-color laser including a red laser, a blue laser and a green laser. Usually, each laser is equipped with a laser driving module, and the laser is powered by the corresponding laser driving module. The laser driving module can be a DC-DC conversion circuit, specifically a boost circuit or a buck circuit. The laser driving module is connected to a power board, and the input end of the laser driving module receives the power input voltage output by the power board.

[0057] In the related art, in order to improve the uniformity of the circuit, the laser driving modules corresponding to different lasers are usually set to be the same circuit, that is, all are boost circuits, or all are buck circuits. Figure 3 FIG. 1 is a schematic diagram of the structure of a laser projection device in the related art. Figure 3 As shown, taking the laser projection device including three-color lasers as an example, the laser driving module 30 corresponding to each laser 40 receives the power supply input voltage V output by the power board 10 in , and the supply input voltage V in Converted to the corresponding power supply output voltage V out , output through the output end, the positive electrode of the laser 40 is connected to the output end of the laser driving module 30, and the negative electrode of the laser 40 is grounded, wherein the power supply output voltage V out is the supply voltage V across the laser d , when working, by adjusting the power supply output voltage V out The brightness of the laser is adjusted by the size of the supply voltage V d =V out , V d The power supply range in the step-down circuit is [0,V in ], in the boost circuit (V in ,+∞].

[0058] However, in actual applications, the brightness of different lasers is different and the difference is large. Therefore, the power supply voltages at both ends of different lasers will also vary greatly, that is, the power supply output voltages of different laser driver modules will also vary greatly. For example, the power supply voltages corresponding to red lasers, blue lasers, and green lasers are 8V, 15V, and 18V, respectively. In applications where the laser driver module is a boost circuit, it is necessary to set the power supply input voltage based on the power supply voltage at both ends of the laser with the lowest brightness, that is, based on the voltage of 8V, the power supply input voltage can be set to 6V. The three laser driver modules will output 6V of the power supply. The input voltage is converted into 8V, 15V, and 18V power supply output voltages, respectively. Among them, 8V is quite different from 15V and 18V, and the output power of the power board is constant. In this way, some components in the laser driver module with a large voltage difference will bear a large current; and in the application of the laser driver module as a boost circuit, it is necessary to set the power supply input voltage based on the power supply voltage at both ends of the laser with the highest brightness, that is, based on the voltage of 18V, the power supply input voltage can be set to 21V, among which 21V is quite different from 8V and 15V, and some components in the laser driver module will bear a large voltage. In other words, the difference between the power supply input voltage and the power supply voltage at both ends of the laser in the related technology is large, resulting in a high current or voltage of some components in the laser driver module, which makes the service life of the laser driver module shorter.

[0059] In addition, in the related art, in the application scenario where the laser driving module is a step-down circuit, the laser driving module may have faults such as short circuit, which causes the laser to be subjected to a large supply voltage, thereby damaging the laser.

[0060] In view of the above problems, the present application provides a laser projection device, in which the input end of the laser driving module is connected to the output end of the power supply board and the negative pole of the laser, the output end of the laser driving module is connected to the positive pole of the laser, and the power supply voltage at both ends of the laser is the difference between the power supply output voltage and the power supply input voltage. In this way, the power supply voltage range at both ends of the laser can be zero to infinity, so the setting of the power supply input voltage will no longer be limited by the minimum or maximum voltage of the laser, and the difference between the power supply input voltage and the power supply voltage at both ends of the laser can be reduced, thereby reducing the current or voltage of some components in the laser driving module and improving the service life of the laser driving module.

[0061] The technical solutions of the present application and the technical solutions of the present application are described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. In the description of the present application, unless otherwise clearly specified and limited, each term should be understood in a broad sense in the art. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0062] Figure 4 This is a schematic diagram of the structure of a laser projection device provided in one embodiment of the present application. Figure 4 FIG. 4 shows a partial circuit of a laser projection device, and other circuits not related to the present application are not shown. In addition, only one laser 40 and a corresponding laser driving module 30 are shown in the figure. Figure 4 As shown, the laser projection device provided in this embodiment includes: a laser light source, a light modulation device 50, a projection lens 60, a display control module 20, a power board 10, and at least one laser driving module 30.

[0063] The laser light source includes at least one laser 40, which is used to emit a laser beam to provide an illumination beam for the device; at least one laser 40 corresponds to at least one laser driving module 30 one by one;

[0064] A display control module 20, used for outputting a dimming signal and an image display driving signal for driving the light modulation device 50;

[0065] The light modulator 50 modulates the laser beam under the drive of the image display drive signal;

[0066] A projection lens 60, used to receive the modulated laser beam and project an image;

[0067] The power board 10 is used to output the power supply input voltage through the output terminal of the power board 10;

[0068] The input end of the laser driving module 30 is connected to the output end of the power board 10 and the negative pole of the corresponding laser 40, and the output end of the laser driving module 30 is connected to the positive pole of the corresponding laser 40; the laser driving module 30 is used to output the power supply output voltage based on the power supply input voltage, the dimming signal and the corresponding driving current of the laser 40, and through the output end of the laser driving module 30; the power supply output voltage is not less than the power supply input voltage.

[0069] The laser 40 display device of this embodiment may include but is not limited to laser televisions, projector devices of laser beam scanning systems, head-mounted displays, laser liquid crystal TVs, organic laser TVs, and stereoscopic (three-dimensional) displays, etc.

[0070] In this embodiment, the display control module 20 , the light modulation device 50 , the projection lens 60 and the laser 40 can refer to the above-mentioned example description, which will not be described in detail here.

[0071] The power board 10 can receive AC power, and after filtering and transforming the AC power, output a DC power supply input voltage to the laser driving module 30. The laser driving module 30 outputs a power supply output voltage to the laser 40 based on the laser driving signal output by the display control module 20 to drive the corresponding laser 40.

[0072] In some examples, Figure 5 This is a schematic diagram of the structure of another laser projection device provided in an embodiment of the present application, in order to focus on describing the important improved parts. Figure 5 Components such as the light modulation device 50 and the projection lens 60 are not shown. Figure 5 As shown, the power board 10 may include a bridge rectifier circuit 11 and a power conversion circuit, wherein the power conversion circuit may include a PFC and LLC circuit 13. The rectifier bridge circuit 11 receives the AC power, rectifies and filters the AC power, and then outputs it to the PFC circuit 12 and the LLC circuit 13, and performs power conversion through the PFC circuit 12 and the LLC circuit 13 to output a DC power supply input voltage Vin to the laser driving module 30.

[0073] like Figure 4 , Figure 5 As shown, the input end of the laser driving module 30 is connected to the output end of the power board 10 and the negative electrode of the corresponding laser 40, and the output end of the laser driving module 30 is connected to the positive electrode of the corresponding laser 40; the voltage at the input end of the laser driving module 30 is the power supply input voltage V in , the voltage at the output end is the power supply output voltage V out , where the power supply output voltage V out Greater than the power supply input voltage V in , then the laser driving module 30 itself is a boost voltage, and the supply voltage V at both ends of the laser 40 d for:

[0074] V d =V out -V in

[0075] Among them, V out The theoretical range is [V in , +∞), of course, in practical applications, it is limited by the characteristics of the electronic components in the laser drive module, V out There is an upper limit, but V out The upper limit value of V is much larger than the supply voltage of the laser 40, so in this example, V out The upper limit value is considered as +∞, then V d The theoretical range of V is [0, +∞), that is, in this embodiment, inIt will not be limited by the voltage of the laser 40 with the maximum brightness or the voltage of the laser 40 with the minimum brightness, so that a suitable voltage can be selected as the power supply input voltage V based on the brightness of each laser 40. in For example, in the example where the brightness of the three-color laser 40 is 8V, 15V, and 18V respectively, the power supply input voltage V in is 12V, so compared with the related art, this embodiment can reduce the power supply input voltage V in The power supply voltage V across the corresponding laser 40 d The difference can thereby reduce the current or voltage of some components in the laser driving module.

[0076] In addition, in this embodiment, when the laser driving module 30 is short-circuited, the voltage across the laser 40 is equivalent to being zero, and the laser 40 will not be subjected to a large supply voltage. Therefore, this embodiment can also prevent damage to the laser 40 when the laser driving module 30 is short-circuited.

[0077] In some examples, Figure 6 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the laser driving module 30 includes: a sampling unit 31, a controller 32 and a driving unit 33;

[0078] The sampling unit 31 is connected to the corresponding laser 40 and the controller 32 and is used to sample the driving current of the corresponding laser 40;

[0079] The controller 32 is connected to the driving unit 33 and the display control module 20, and is used to generate a driving signal Dvr based on the dimming signal and the corresponding driving current of the laser 40;

[0080] The input end of the driving unit 33 is connected to the output end of the power board 10 and the negative pole of the corresponding laser 40, and the output end of the driving unit 33 is connected to the positive pole of the corresponding laser 40. The driving unit 33 is used to output the power supply output voltage based on the driving signal and the power supply input voltage.

[0081] In this example, the sampling unit 31 is used to sample the driving current flowing through the laser 40, and transmit the sampled driving current to the controller 32. As an example, the sampling unit 31 may include a first resistor, wherein the first resistor may be connected in series with the corresponding laser 40, and the first resistor is a sensitive resistor with a relatively small resistance value. The controller 32 may obtain the current driving current flowing through the laser 40 based on the voltage across the sampled first resistor R1 and Ohm's law. It can be understood that the sampled driving current may be used as a feedback signal of the laser driving module 30.

[0082] The controller 32 may be a processor with computing and processing functions, such as a microcontroller unit (MCU). The controller 32 has a plurality of input pins and output pins. A preset control program is written in the controller 32. The controller 32 receives the dimming signal and the driving current sampled by the sampling unit 31. Under the control of the control program, the controller 32 generates a driving signal Dvr based on the driving current and the dimming signal. The driving unit 33 converts the power supply input signal V in Converted to power supply output voltage V out Therefore, by controlling the driving signal Dvr, V out With V in The difference between the two ends of the laser 40 is controlled to achieve the supply voltage V d control.

[0083] As an example, continue to refer to Figure 6 , the driving signal is a PWM signal;

[0084] The controller 32 is used to obtain a reference driving current of the corresponding laser based on the dimming signal; it is also used to output a first driving signal with a duty cycle greater than 0.5 when the reference power supply voltage is greater than the power supply input voltage; and when the reference power supply voltage is not greater than the power supply input voltage, it outputs a second driving signal with a duty cycle not greater than 0.5; the reference power supply voltage is the voltage across the corresponding laser 40 when the reference power supply current is reached;

[0085] The driving unit 33 is used to output a first power supply output voltage when receiving a first driving signal, and the difference between the first power supply output voltage and the power supply input voltage is greater than the power supply input voltage; and to output a second power supply output voltage when receiving a second driving signal, and the difference between the second power supply output voltage and the power supply input voltage is not greater than the power supply input voltage.

[0086] This example further introduces the controller 32 and the drive unit 33. The controller 32 receives a dimming signal, which is sent by the display control module 20 and can be an analog signal or a digital signal. The controller 32 generates a corresponding reference drive current based on the dimming signal and through a pre-written algorithm. It can be understood that the reference drive current is the drive current required for the laser 40 to reach the brightness corresponding to the dimming signal. The reference supply voltage is the supply voltage at both ends of the laser 40 when the reference supply current is reached.

[0087] In this example, the driving signal is a PWM signal, and the power supply output voltage V of the laser driving module 30 can be adjusted based on the duty cycle of the PWM signal. out1 , thereby controlling the supply voltage V across the laser 40 d Among them, when the reference supply voltage Vd ‘ Greater than the power supply input voltage V in When receiving the first driving signal, the driving unit 33 outputs a first power supply output voltage V out1 ,in

[0088] V out1 -V in =V d >V in

[0089] That is to say, when the controller 32 outputs a driving signal with a duty cycle greater than 0.5, from the overall effect, the laser driving module 30 is equivalent to a boost circuit. d ‘ Not greater than the power supply input voltage V in When the duty cycle is not greater than 0.5, the second driving signal is output, and the second power supply output voltage V out2 ,in

[0090] V out2 -V in =V d ≤V in

[0091] At this time, the laser driving module 30 is equivalent to a step-down circuit. It should be noted that only because V d ≤V in , from the overall effect, the voltage is reduced, so the laser driving module 30 is equivalent to a step-down circuit, but the laser driving module 30 itself is still V out >V in The boost circuit.

[0092] For example, taking the laser projection device including a dual-color laser as an example, the reference power supply current of the blue laser is 3A, and the corresponding reference power supply voltage is 18V; the reference power supply current of the red laser is 1.5A, and the corresponding reference power supply voltage is 9V. The power supply input voltage V in =12V, the first controller corresponding to the blue laser outputs a PWM signal with a duty cycle of 0.8, and the corresponding first power supply unit outputs a power supply output voltage V of 30V out1 , V d =18V. The second controller corresponding to the red laser outputs a PWM signal with a duty cycle of 0.3, and the corresponding second power supply unit outputs a power supply output voltage V of 21V. out2 , then V d =9V.

[0093] This example controls the output voltage of the laser driver module by controlling the duty cycle of the driving signal, thereby controlling the supply voltage at both ends of the laser, and achieving a boost in the supply voltage at both ends of the laser relative to the supply input voltage when the duty cycle is greater than 0.5, and a step-down in the supply voltage at both ends of the laser relative to the supply input voltage when the duty cycle is not greater than 0.5. Therefore, this example can achieve a boost and step-down in the voltage at both ends of the laser based on different scenarios through the same type of laser driver module.

[0094] In addition, based on the above examples, some examples, such as Figure 6 As shown, the controller 32 is also used to reduce the duty cycle of the drive signal when the drive current of the corresponding laser 40 is greater than the reference drive current, so as to reduce the power supply output voltage output by the drive unit 33; the controller 32 is also used to increase the duty cycle of the drive signal when the drive current of the corresponding laser 40 is not greater than the reference drive current, so as to increase the power supply output voltage output by the drive unit 33.

[0095] In this example, the driving current of the laser can be sampled by a sampling unit, and the sampled driving current is fed back to the controller as a feedback signal, so that the controller makes corresponding adjustments to the duty cycle based on the comparison result between the feedback driving current and the reference driving current, thereby achieving precise control of the driving current of the laser.

[0096] In some examples, Figure 7 The schematic diagram of the structure of the laser driving module provided in the embodiment of the present application is as follows: Figure 7 As shown, the driving unit 33 includes: a first inductor L1, a first diode VD1, a first switch tube V1 and a first capacitor C1;

[0097] One end of the first inductor L1 is connected to the output end of the power board 10, and the other end of the first inductor L1 is connected to the positive electrode of the first diode VD1 and one end of the first switch tube V1;

[0098] The cathode of the first diode VD1 is connected to the anode of the first capacitor C1, and the cathode of the first capacitor C1 is grounded;

[0099] The other end of the first switch tube V1 is grounded, and the control end of the first switch tube V1 is connected to the controller 32 .

[0100] In this example, continue to refer to Figure 7 , the first inductor L1L and the first capacitor C1 are energy storage elements. When the driving unit 33 is started, the first switch tube V1 is closed, V in The first inductor L1 is charged; then the first switch tube V1 is disconnected, and the first inductor L1 and V in discharge together and charge the first capacitor C1, thus making V out Greater than Vin When the first switch V1 is closed, V in The first inductor L1 is charged again, and the first capacitor C1 is discharged to output V out . Where V out The size of V is determined by the on-off time of the first switch tube V1. The longer the on time of the first switch tube V1 is, the shorter the off time is. out The larger the value, the smaller the value. The off time of the first switch tube V1 is determined by the duty cycle of the received drive signal Drv. The specific power supply output voltage V out Can be:

[0101]

[0102] Where D is the duty cycle of the PWM signal, 0≤D<1, the power supply voltage V across the laser 40 d for:

[0103]

[0104] From the above formula, when the duty cycle is greater than 0.5, V d Greater than V in , the laser driving module 30 is equivalent to a boost circuit. When the duty cycle is not greater than 0.5, V d Not greater than V in , the laser driving module 30 is equivalent to a step-down circuit.

[0105] Continue to refer to Figure 7 , based on the above example, the sampling unit 31 includes: a first resistor R1;

[0106] One end of the first resistor R1 is connected to the anode of the corresponding laser 40 and the controller 32 , and the other end of the first resistor R1 is connected to the cathode of the first diode VD1 and the controller 32 .

[0107] The controller 32 can obtain the driving current of the laser 40 based on the voltage across the first resistor R1 and Ohm's law.

[0108] In the laser projection device provided in this embodiment, the input end of the laser driving module is connected to the output end of the power board and the negative electrode of the corresponding laser, and the output end of the laser driving module is connected to the positive electrode of the corresponding laser. The laser driving module is used to output the power supply output voltage based on the power supply input voltage, the dimming signal and the corresponding laser driving current, and through the output end of the laser driving module, the power supply output voltage is not less than the power supply input voltage. In this scheme, by connecting the input end of the laser driving module to the negative electrode of the laser, and the output end of the laser driving module to the positive electrode of the corresponding laser, the power supply voltage at both ends of the laser is the difference between the power supply output voltage and the power supply input voltage, and the power supply output voltage is not less than the power supply input voltage. In this way, the power supply voltage range at both ends of the laser can be zero to infinity, so the setting of the power supply input voltage will no longer be limited by the minimum or maximum voltage of the laser, and then the difference between the power supply input voltage and the power supply voltage at both ends of the laser can be reduced, so that the current or voltage of some components in the laser driving module can be reduced, and the service life of the laser driving module can be improved.

[0109] In yet another embodiment of the present application, a laser driving module is provided, comprising: a sampling unit, a controller and a driving unit;

[0110] The sampling unit is connected to the corresponding laser and the controller, and is used to sample the driving current of the corresponding laser;

[0111] The controller is connected to the driving unit and the display control module, and is used to generate a driving signal based on the dimming signal sent by the display control module and the driving current of the corresponding laser;

[0112] The input end of the driving unit is connected to the output end of the power board and the negative pole of the corresponding laser, and the power board is used to output the power supply input voltage through the output end of the power board; the output end of the driving unit is connected to the positive pole of the corresponding laser, and the driving unit is used to output the power supply output voltage based on the driving signal and the power supply input voltage and through the output end of the driving unit.

[0113] The laser driving module provided in this embodiment and the module of the laser projection device in the above embodiment are specifically referred to the above embodiment, and this embodiment will not be described in detail here.

[0114] In another embodiment of the present application, a control method for a laser projection device is also provided. The method provided in this embodiment is applied to the laser projection device in any of the above embodiments, and can be implemented by various modules of the laser projection device in any of the above embodiments through software and / or hardware. Figure 8 A flow chart of a control method for a laser projection device provided in an embodiment of the present application is shown as follows: Figure 8As shown, the control method of the laser projection device of this embodiment may include:

[0115] S801: The laser emits a laser beam to provide an illumination beam for the device;

[0116] S802: a display control module outputs a dimming signal and an image display driving signal for driving the light modulation device;

[0117] S803: The light modulation device modulates the laser beam under the drive of the image display driving signal;

[0118] S804: A projection lens receives the modulated laser beam and projects an image;

[0119] S805: The power board outputs the power supply input voltage through the output end of the power board; the output end of the power board is connected to the input end of the at least one laser driving module; the input end of the laser driving module is connected to the negative electrode of the corresponding laser, and the output end of the laser driving module is connected to the positive electrode of the corresponding laser;

[0120] S806: The laser driving module outputs a power supply output voltage based on the power supply input voltage, the dimming signal and the corresponding laser driving current, and through the output end of the laser driving module; the power supply output voltage is not less than the power supply input voltage.

[0121] The control method of the laser projection device provided in this embodiment can adopt the various modules of the laser projection device in the above embodiments to execute the process, and its implementation method and technical effect are similar, which will not be described in detail in this embodiment.

[0122] Fig. 9 A flow chart of another control method of a laser projection device provided in an embodiment of the present application is shown as follows: Fig. 9 As shown, the laser driving module includes: a sampling unit, a controller and a driving unit; S806 includes:

[0123] S8061: the sampling unit samples the driving current of the corresponding laser;

[0124] S8062: The controller generates a driving signal based on the dimming signal and the driving current of the corresponding laser; the input end of the driving unit is connected to the output end of the power board and the negative electrode of the corresponding laser, and the output end of the driving unit is connected to the positive electrode of the corresponding laser;

[0125] S8063: The driving unit outputs a power supply output voltage based on the driving signal and the power supply input voltage.

[0126] The control method of the laser projection device provided in this embodiment can adopt the various modules of the laser projection device in the above embodiments to execute the process, and its implementation method and technical effect are similar, which will not be described in detail in this embodiment.

[0127] In some other embodiments, the driving signal is a PWM signal; S8062 includes:

[0128] The controller acquires a reference driving current of the corresponding laser based on the dimming signal;

[0129] The controller outputs a first drive signal with a duty cycle greater than 0.5 when the reference power supply voltage is greater than the power supply input voltage; and outputs a second drive signal with a duty cycle less than 0.5 when the reference power supply voltage is not greater than the power supply input voltage; the reference power supply voltage is the voltage across the corresponding laser when the reference power supply current is reached;

[0130] S8063 includes: when the driving unit receives the first driving signal, it outputs a first power supply output voltage, and the difference between the first power supply output voltage and the power supply input voltage is greater than the power supply input voltage; and when the driving unit receives the second driving signal, it outputs a second power supply output voltage, and the difference between the second power supply output voltage and the power supply input voltage is not greater than the power supply input voltage.

[0131] The control method of the laser projection device provided in this embodiment can adopt the various modules of the laser projection device in the above embodiments to execute the process, and its implementation method and technical effect are similar, which will not be described in detail in this embodiment.

[0132] Fig.10 This is a schematic diagram of the hardware structure of the electronic device provided in this application. Fig.10 As shown, the electronic device 100 is used to implement the operation corresponding to the laser driving circuit in any of the above method embodiments. The electronic device 100 of this embodiment may include: a memory 101 and a processor 102;

[0133] Memory 101, used for storing computer programs;

[0134] The processor 102 is used to execute the computer program stored in the memory to implement the laser driving method in the above embodiment. For details, please refer to the relevant description in the above method embodiment.

[0135] Optionally, the memory 101 may be independent or integrated with the processor 102 .

[0136] When the memory 101 is a device independent of the processor 102, the electronic device 100 may further include:

[0137] The bus 103 is used to connect the memory 101 and the processor 102 .

[0138] Optionally, this embodiment may further include: a communication interface 104, which may be connected to the processor 102 via the bus 103. The processor 102 may control the communication interface 103 to implement the above-mentioned receiving and sending functions of the electronic device 100.

[0139] The present application also provides a computer-readable storage medium, which includes a computer program, and the computer program is used to implement the laser driving method in the above embodiment.

[0140] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0141] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0142] In addition, each functional module in each embodiment of the present application can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The above-mentioned module-composed unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0143] The above-mentioned integrated module implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the methods of various embodiments of the present application.

[0144] It should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the application may be directly implemented as being executed by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.

[0145] The memory may include a high-speed RAM memory, and may also include a non-volatile storage NVM, such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a magnetic disk or an optical disk, etc.

[0146] The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application is not limited to only one bus or one type of bus.

[0147] The computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The storage medium may be any available medium that can be accessed by a general or special purpose computer.

[0148] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0149] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A laser projection device, characterized in that: include: Laser light source, light modulation device, projection lens, display control module, power board, at least one laser driving module, The laser light source includes at least one laser, which is used to emit a laser beam to provide an illumination beam for the device; the at least one laser corresponds to the at least one laser driving module one by one; The display control module is used to output a dimming signal and an image display driving signal for driving the light modulation device; The light modulation device is used to modulate the laser beam under the drive of the image display driving signal; the projection lens is used to receive the modulated laser beam and project an image; The power board is used to output the power supply input voltage through the output terminal of the power board; The input end of the laser driving module is connected to the output end of the power board and the negative pole of the corresponding laser, and the output end of the laser driving module is connected to the positive pole of the corresponding laser; the laser driving module is used to output the power supply output voltage based on the power supply input voltage, the dimming signal and the driving current of the corresponding laser through the output end of the laser driving module; the power supply output voltage is not less than the power supply input voltage.

2. The laser projection device according to claim 1, characterized in that: The laser driving module includes: a sampling unit, a controller and a driving unit; The sampling unit is connected to the corresponding laser and the controller, and is used to sample the driving current of the corresponding laser; The controller is connected to the driving unit and the display control module, and is used to generate a driving signal based on the dimming signal and the corresponding driving current of the laser; The input end of the driving unit is connected to the output end of the power board and the negative pole of the corresponding laser, and the output end of the driving unit is connected to the positive pole of the corresponding laser. The driving unit is used to output a power supply output voltage based on the driving signal and the power supply input voltage.

3. The laser projection device according to claim 2, characterized in that: The driving signal is a PWM signal; The controller is used to obtain a reference driving current of the corresponding laser based on the dimming signal; and is also used to output a first driving signal with a duty cycle greater than 0.5 when the reference power supply voltage is greater than the power supply input voltage; and, when the reference power supply voltage is not greater than the power supply input voltage, outputting a second driving signal with a duty cycle not greater than 0.5; The reference power supply voltage is the voltage across the corresponding laser when the reference power supply current is reached; The driving unit is configured to output a first power supply output voltage when receiving the first driving signal, wherein a difference between the first power supply output voltage and the power supply input voltage is greater than the power supply input voltage; And when receiving the second driving signal, a second power supply output voltage is output, and the difference between the second power supply output voltage and the power supply input voltage is not greater than the power supply input voltage.

4. The laser projection device according to claim 3, characterized in that: The controller is further configured to reduce the duty cycle of the drive signal to reduce the power supply output voltage output by the drive unit when the drive current of the corresponding laser is greater than the reference drive current; The controller is further used to increase the duty cycle of the driving signal to increase the power supply output voltage output by the driving unit when the driving current of the corresponding laser is not greater than the reference driving current.

5. The laser projection device according to claim 3, characterized in that: The driving unit includes: a first inductor, a first diode, a first switch tube and a first capacitor; One end of the first inductor is connected to the output end of the power board, and the other end of the first inductor is connected to the anode of the first diode and one end of the first switch tube; The cathode of the first diode is connected to the anode of the first capacitor, and the cathode of the first capacitor is grounded; The other end of the first switch tube is grounded, and the control end of the first switch tube is connected to the controller.

6. The laser projection device according to claim 5, characterized in that: The sampling unit comprises: a first resistor; One end of the first resistor is connected to the positive electrode of the corresponding laser and the controller, and the other end of the first resistor is connected to the negative electrode of the first diode and the controller.

7. A control method, characterized in that: Applied to a laser projection device, the laser projection device comprises: a laser light source, a light modulation device, a projection lens, a display control module, a power supply board, and at least one laser driving module, the laser light source comprises at least one laser, and the at least one laser corresponds to the at least one laser driving module one by one; the method comprises: The laser emits a laser beam to provide an illumination beam for the device; The display control module outputs a dimming signal and an image display driving signal for driving the light modulation device; The light modulation device modulates the laser beam under the drive of the image display driving signal; The projection lens receives the modulated laser beam and projects an image; The power board outputs the power supply input voltage through the output end of the power board; the output end of the power board is connected to the input end of the at least one laser driving module; the input end of the laser driving module is connected to the negative electrode of the corresponding laser, and the output end of the laser driving module is connected to the positive electrode of the corresponding laser; The laser driving module outputs a power supply output voltage based on the power supply input voltage, the dimming signal and the corresponding laser driving current, and through the output end of the laser driving module; the power supply output voltage is not less than the power supply input voltage.

8. The control method according to claim 7, characterized in that: The laser driving module comprises: a sampling unit, a controller and a driving unit; the laser driving module outputs a power supply output voltage through an output end of the laser driving module based on the power supply input voltage, the dimming signal and the corresponding laser driving current, including: The sampling unit samples the driving current of the corresponding laser; The controller generates a driving signal based on the dimming signal and the driving current of the corresponding laser; the input end of the driving unit is connected to the output end of the power board and the negative electrode of the corresponding laser, and the output end of the driving unit is connected to the positive electrode of the corresponding laser; The driving unit outputs a power supply output voltage based on the driving signal and the power supply input voltage.

9. The control method according to claim 8, characterized in that: The driving signal is a PWM signal; the controller generates the driving signal based on the dimming signal and the corresponding driving current of the laser, including: The controller acquires a reference driving current of the corresponding laser based on the dimming signal; The controller outputs a first drive signal with a duty cycle greater than 0.5 when the reference power supply voltage is greater than the power supply input voltage; and outputs a second drive signal with a duty cycle less than 0.5 when the reference power supply voltage is not greater than the power supply input voltage; the reference power supply voltage is the voltage across the corresponding laser when the reference power supply current is reached; The driving unit outputs a power supply output voltage based on the driving signal and the power supply input voltage, including: When receiving the first driving signal, the driving unit outputs a first power supply output voltage, and the difference between the first power supply output voltage and the power supply input voltage is greater than the power supply input voltage; and when receiving the second driving signal, the driving unit outputs a second power supply output voltage, and the difference between the second power supply output voltage and the power supply input voltage is not greater than the power supply input voltage.

10. A laser driving module, characterized in that: include: Sampling unit, controller and drive unit; The sampling unit is connected to the corresponding laser and the controller, and is used to sample the driving current of the corresponding laser; The controller is connected to the driving unit and the display control module, and is used to generate a driving signal based on the dimming signal sent by the display control module and the driving current of the corresponding laser; The input end of the driving unit is connected to the output end of the power board and the negative pole of the corresponding laser, and the power board is used to output the power supply input voltage through the output end of the power board; the output end of the driving unit is connected to the positive pole of the corresponding laser, and the driving unit is used to output the power supply output voltage based on the driving signal and the power supply input voltage and through the output end of the driving unit.

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