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 display control module and at least one laser driving module, and the laser driving module comprises a control unit and a driving unit; the control unit generates a control signal based on the image enable signal and the power supply control signal, and the driving unit generates a power supply signal based on the control signal; wherein the control signal comprises a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to an effective level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is an effective level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal. The starting speed of the laser driving module can be improved, so that the lightening speed of the laser is improved.

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, and each laser is powered by a corresponding laser driver module. In laser projection equipment including multi-color lasers, multiple lasers are lit in turn.

[0003] In the related art, the laser driving module includes a controller, a switch tube and an energy storage element. After receiving the start signal, the controller outputs a control signal. The control signal is a pulse width modulation signal (PWM for short). The control signal is used to control the opening and closing of the switch tube. The energy storage element is charged and discharged by the opening and closing of the switch tube. When the stored electricity in the energy storage element reaches the reference power supply value, the startup is completed, and then the brightness of the corresponding laser is adjusted by adjusting the duty cycle of the PWM signal.

[0004] However, in the related art, the startup speed of the laser driving module is slow, so that the laser cannot be lit in time, thereby affecting the display effect of the laser projection device. 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 laser driving module has a slow startup speed, so that the laser cannot be lit in time, thereby affecting the display effect of the laser projection device.

[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, and at least one laser driving module, wherein the laser light source comprises at least one laser, and the laser 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 driving signal and an image display driving signal; the dimming driving signal comprises an image enable signal and a power supply control signal; 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 laser driving module comprises a control unit and a driving unit; The control unit is connected to the display control module and the driving unit, and is used to generate a control signal based on the image enable signal and the power supply control signal; the driving unit is connected to the corresponding laser, and is used to generate a power supply signal to supply power to the corresponding laser based on the control signal; the control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

[0007] In some embodiments, the control unit includes a frequency control subunit and a controller; the controller is connected to the display control module and the driving unit; the frequency control subunit is connected to the controller, and is used to control the controller to output a control signal of a first frequency when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal, and to control the controller to output a control signal of a second frequency when the image enable signal is a valid level and the power supply signal reaches the reference power supply value corresponding to the power supply control signal; the first frequency is less than the second frequency, the control signal of the first frequency includes the first control signal, and the control signal of the second frequency is the second control signal.

[0008] In some embodiments, the display control module is also connected to the frequency control subunit, and is used to output a first frequency adjustment signal when the image enable signal is converted from an invalid level to a valid level, and to output a second frequency adjustment signal after the power supply signal reaches a reference power supply value corresponding to the power supply control signal and the image enable signal is at a valid level; the frequency control subunit is used to control the controller to output a control signal of a first frequency when receiving the first frequency adjustment signal; and to control the controller to output a control signal of a second frequency when receiving the second frequency adjustment signal.

[0009] In some embodiments, the frequency control subunit includes: an external resistor subunit, which is connected to the display control module and the frequency setting pin of the controller, and is used to adjust the resistance of the external resistor subunit to a first resistance value when receiving a first frequency adjustment signal; and adjust the resistance of the external resistor subunit to a second resistance value when receiving a second frequency adjustment signal; the controller is used to generate a control signal of a first frequency based on the external resistor subunit of the first resistance value; and generate a control signal of a second frequency based on the external resistor subunit of the second resistance value.

[0010] In some embodiments, the external resistor subunit includes: a first switch tube, a first resistor and a second resistor, one end of the first switch tube is connected to the frequency setting pin of the controller, the other end of the first switch tube is connected to one end of the first resistor, and the control end of the first switch tube is connected to the display control module; the other end of the first resistor is grounded; one end of the second resistor is connected to one end of the first switch tube and the frequency setting pin of the controller, and the other end of the second resistor is connected to the other end of the first resistor and grounded.

[0011] In some embodiments, the control unit is further used to enter a standby state when the first duration of the image enable signal being at an invalid level exceeds a predetermined duration; otherwise, not enter the standby state; the predetermined duration is not less than the period of the image enable signal.

[0012] In some embodiments, the control unit also includes: a timing subunit; the timing subunit is connected to the controller and the display control module, and is used to record the first duration and send a standby signal to the controller when the first duration exceeds a predetermined duration; the controller is used to enter a standby state when receiving the standby signal; otherwise, it does not enter the standby state.

[0013] In a second aspect, the present application provides a control method, which is applied to a laser projection device as described in any of the previous schemes, the method comprising: the laser emits a laser beam to provide an illumination beam for the device; the display control module outputs a dimming drive signal and an image display drive signal; the dimming drive signal includes an image enable signal and a power supply control signal; the light modulation device modulates the laser beam under the drive of the image display drive signal; the projection lens receives the modulated laser beam and projects an image; the control unit generates a control signal based on the image enable signal and the power supply control signal; the drive unit generates a power supply signal to supply power to the corresponding laser based on the control signal; the control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to an effective level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at an effective level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

[0014] In some embodiments, the control unit includes: a frequency control subunit and a controller; the control unit generates a control signal based on the image enable signal and the power control signal, including: the frequency control subunit controls the controller to output a control signal of a first frequency when the image enable signal is converted from an invalid level to a valid level and the power signal does not reach a reference power value corresponding to the power control signal; the frequency control subunit controls the controller to output a control signal of a second frequency when the image enable signal is at a valid level and the power signal reaches a reference power value corresponding to the power control signal; the first frequency is less than the second frequency, the control signal of the first frequency includes the first control signal, and the control signal of the second frequency is the second control signal.

[0015] In a third aspect, the present application provides a laser driving module, which includes a control unit and a driving unit; the control unit is connected to the display control module and the driving unit, and is used to generate a control signal based on the image enable signal and the power control signal; the driving unit is connected to the corresponding laser, and is used to generate a power supply signal to power the corresponding laser based on the control signal; the control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

[0016] In the laser projection device, control method and laser driving module provided in this embodiment, the laser driving module includes a control unit and a driving unit, the control unit is connected to the display control module and the driving unit, the control unit outputs a first control signal of a constant level when the image enable signal is converted from an invalid level to an effective level and the power supply signal does not reach the reference power supply value corresponding to the power supply control signal, and outputs a second control signal of a PWM signal after the power supply signal reaches the reference power supply value corresponding to the power supply control signal and the image enable signal is at an effective level, and the driving unit generates a power supply signal based on the control signal. In this solution, a first control signal of a constant level is output when the laser driving module is started, and a second control signal of a PWM signal is output after starting. The first control signal of a constant level can speed up the charging speed of the energy storage element relative to the PWM signal, so that the power supply signal can quickly reach the reference power supply value, thereby increasing the starting speed of the laser driving module, and thus increasing the lighting speed of the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0018] Figure 1 A schematic diagram of a laser projection device provided in an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of a circuit architecture of a laser projection device in an embodiment;

[0020] Figure 3is a schematic structural diagram of a laser projection device in an example;

[0021] Figure 4 A schematic diagram of the structure of a laser projection device provided in an embodiment of the present application;

[0022] Figure 5 is a timing diagram of an image enable signal EN of a laser in an example;

[0023] Figure 6 This is a schematic diagram of the structure of a laser driving module in an example;

[0024] Figure 7 is a timing diagram of each control signal in the related art;

[0025] Figure 8 A timing diagram of various control signals provided in an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application;

[0027] Fig.10 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application;

[0028] Fig.11 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application;

[0029] Fig.12 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application;

[0030] Fig.13 Another timing diagram of each control signal provided in an embodiment of the present application;

[0031] Fig.14 A flow chart of a control method provided in an embodiment of the present application;

[0032] Fig.15 A schematic diagram of the hardware structure of the electronic device provided in this application.

[0033] 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

[0034] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0035] 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.

[0036] In addition, the terms "include" and "have" 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 expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0037] The following is an explanation of the terms used 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 dual-light 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 002, and a TV panel 003. Among them, the power panel 002 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 002. Alternatively, the laser driving module can also be provided independently of the power panel 002.

[0047] The TV board 003 is mainly used to receive and decode external audio and video signals, and output video image signals. The TV board 003 is provided with a system-on-chip (SoC), which can decode data in different data formats into a normalized format, and transmit the normalized format data to the display board 001 through, for example, a connector. The video image signal output by the TV board 003 is transmitted to the display board 001.

[0048] The display panel 001 may be provided with a field programmable gate array (FPGA) and a display control module 20, 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.

[0049] The display control module 20 mainly includes a digital light processing chip (Digital Light Processing, DLP), and may also include a driver chip for outputting an image display drive signal and an output dimming drive signal; wherein the dimming drive signal includes an image enable signal and a power supply control signal. The image display drive signal is used to drive the light modulator, and the light modulator modulates the laser beam under the drive of the image display drive signal; the projection lens is used to receive the modulated laser beam and project the image.

[0050] 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 power control signal, which is a PWM signal. Along with the DMD chip's timing 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 power control signal to notify the laser light source at what brightness to light up a certain laser.

[0051] 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 projected image requires the synchronous coordination of the light source light beam and the light modulator, the display control module 20 also generates a dimming driving signal. The dimming driving signal may include an image enable signal EN and a power supply control signal, such as a current PWM signal, wherein the 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.

[0052] 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 power supply control 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.

[0053] In the figure, the laser 40 can be a single-color laser or a multi-color laser. Figure 3 As shown in the structural diagram of the laser projection device, the laser 40 may include: three groups of lasers of different colors, namely a blue laser 41 for emitting blue laser, a red laser 42 for emitting red laser, and a green laser 43 for emitting green laser. Each of the above lasers may be a multi-chip laser (MCL).

[0054] For example, in Figure 3 In the embodiment, the display control module 20 can output a blue PWM signal B_PWM corresponding to the blue laser 41 based on the blue primary color component of the image to be displayed, output a red PWM signal R_PWM corresponding to the red laser 42 based on the red primary color component of the image to be displayed, and output a green PWM signal G_PWM corresponding to the green laser 43 based on the green primary color component of the image to be displayed.

[0055] The display control module 20 can output an image enable signal B_EN0 corresponding to the blue laser 41 based on the lighting duration of the blue laser 41 in the driving cycle, output an image enable signal R_EN0 corresponding to the red laser 42 based on the lighting duration of the red laser 42 in the driving cycle, and output an image enable signal G_EN0 corresponding to the green laser 43 based on the lighting duration of the green laser 43 in the driving cycle. In other words, the image enable signal is a periodic PWM signal. For example, when the red laser 42 is lit based on the high level of the corresponding image enable signal R_EN0, the other two lasers are not working based on the low level of the corresponding image enable signal, thereby realizing the lighting of different lasers in turn.

[0056] In a related example, the laser driving module includes a controller, a switch tube and an energy storage element. The controller receives a corresponding image enable signal and a power supply control signal. The image enable signal is used to control the state of the controller. When the image enable signal changes from a low level to a high level, the controller starts to start and outputs a PWM control signal. The control signal is used to control the opening and closing of the switch tube. The energy storage element is charged and discharged by opening and closing the switch tube. When the stored electricity in the energy storage element reaches a reference power supply value, the startup is completed, and then the brightness of the corresponding laser is adjusted by adjusting the duty cycle of the PWM signal.

[0057] However, in the related art, the startup speed of the laser driving module is slow, so that the laser cannot be lit in time, thereby affecting the display effect of the laser projection device.

[0058] In view of the above problems, the present application provides a laser projection device, in which, when a laser driving module is started, a first control signal of a constant level is output, and after startup, a second control signal which is a PWM signal is output. The first control signal of the constant level can continuously charge the energy storage element relative to the PWM signal, thereby speeding up the charging speed of the energy storage element, so that the power supply signal can quickly reach a reference power supply value, thereby increasing the startup speed of the laser driving module, thereby increasing the lighting speed of the laser.

[0059] 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.

[0060] Figure 4 A schematic diagram of the structure of a laser projection device provided in an embodiment of the present application is shown in FIG. Figure 4 FIG. 1 shows a partial circuit of a laser projection device, and other circuits not related to the present application are not shown. The figure only shows a laser and a corresponding laser driving module. 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, and at least one laser driving module 30.

[0061] 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;

[0062] The display control module 20 is used to output a dimming drive signal EN and an image display drive signal; the dimming drive signal includes an image enable signal and a power supply control signal;

[0063] The light modulator 50 is used to modulate the laser beam under the drive of the image display driving signal; the projection lens 60 is used to receive the modulated laser beam and project the image;

[0064] The laser driving module 30 includes a control unit 31 and a driving unit 32; the control unit 31 is connected to the display control module 20 and the driving unit 32, and is used to generate a control signal based on the image enable signal and the power supply control signal; the driving unit 32 is connected to the corresponding laser, and is used to generate a power supply signal to supply power to the corresponding laser based on the control signal;

[0065] The control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit 31 when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit 31 when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

[0066] 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.

[0067] 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.

[0068] The power board 002 can receive AC power, and after filtering and transforming the AC power, output a DC power supply input voltage Vin to the laser driving module 30. The laser driving module 30 outputs a power supply output voltage Vout to the laser 40 based on the laser driving signal output by the display control module 20 to drive the corresponding laser 40.

[0069] As an example, the power board 002 may include a bridge rectifier circuit and a power conversion circuit, wherein the power conversion circuit may include a PFC circuit and an LLC circuit. The rectifier bridge circuit receives the mains power, rectifies and filters the mains power, and then outputs it to the PFC circuit and the LLC circuit, and performs power conversion through the PFC circuit and the LLC circuit to supply power to the laser driving module 30.

[0070] In this embodiment, continue to refer to Figure 4, the laser driving module 30 includes a control unit 31 and a driving unit 32, the control unit 31 receives the corresponding image enable signal EN and power supply control signal ADIM output by the display control module 20. As can be seen from the above example, ADIM is used to control the size of the power supply signal output by the laser driving module 30, thereby controlling the brightness of the laser 40. Specifically, the power supply control signal represents the brightness of the corresponding color in the image to be displayed. ADIM can be an analog signal converted from a digital signal. Exemplarily, the laser driving module 30 also includes a digital to analog converter circuit (Digital to Analog Converter, referred to as DAC), the display control module 20 sends a power supply control signal in a digital format, such as a PWM signal, and the DAC circuit converts the PWM signal into an analog format ADIM. The DAC circuit can be integrated in the display control module 20 or in the control unit 31, which is not limited in this embodiment.

[0071] ADIM is a specific corresponding relationship with the reference power supply value. Based on the corresponding relationship, the reference power supply value corresponding to the current ADIM can be obtained, and the reference power supply value can represent the power supply signal required for the laser 40 to reach the brightness corresponding to the image to be displayed. For example, ADIM=0.1I_ 基 , when ADIM is 0.2A, the corresponding reference power supply value is I_ 基 It is 2A. It should be noted that in the laser driving module 30 controlled by constant voltage, the reference power supply value is the reference current value, and in the laser driving module 30 controlled by constant voltage, the reference power supply value is the reference voltage value. To facilitate the understanding of the embodiments of the present application, the following description is based on the reference power supply value as the reference current value.

[0072] The image enable signal EN is a timing control signal used to coordinate the timing of light outputs of different colors. Figure 5 FIG. 1 is a timing diagram of an image enable signal EN of a laser in an example. Figure 5 As shown, the effective level is high level, and the invalid level is low level; when R_EN is high level, the laser driving module corresponding to the red laser 40 works, and the red laser 40 lights up, while the laser driving module corresponding to the green laser 40 and the laser driving module corresponding to the blue laser 40 do not work, and the green laser 40 and the blue laser 40 do not light up. R_EN, G_EN, and B_EN are at high level in sequence, so the three lasers 40 light up in sequence.

[0073] It can be understood that when the EN received by the laser driving module jumps from an invalid level to a valid level, it indicates that it is the turn of the laser 40 corresponding to the laser driving module 30 to light up, and the laser driving module 30 starts to start. In this embodiment, the control unit 31 outputs a first control signal Gate1 of a constant level at startup, and the constant level can increase the speed at which the power supply signal reaches the reference power supply value. This will be explained below with examples.

[0074] Figure 6 is a schematic diagram of the structure of a laser driver module in an example. Figure 6 As shown, the driving unit 32 includes: a third resistor R3, a first inductor L1, a first diode VD1, a second switch tube V2 and a first capacitor C1;

[0075] One end of the third resistor R3 is connected to the control unit 31 and receives the power supply input signal Vin output by the power board, and the other end of the third resistor R3 is connected to the control unit 31 and one end of the second switch tube V2;

[0076] The other end of the second switch tube V2 is connected to the cathode of the first diode VD1 and one end of the first inductor L1, and the control end of the second switch tube V2 is connected to the control unit 31 to receive the control signal Gate;

[0077] The other end of the first inductor L1 is used as an output end, connected to the input end of one end of the first capacitor C1 and the positive electrode of the laser 40;

[0078] The other end of the first capacitor C1 is connected to the anode of the first diode VD1 and the cathode of the laser 40 and is grounded.

[0079] While you work, continue to refer to Figure 6 , the control unit 31 outputs a driving signal Gate, and the driving signal Gate is connected to the control end of the second switch tube V2 to control the opening and closing of the second switch tube V2, wherein the second switch tube V2 can be a P-type or N-type MOS tube, or a triode. The first inductor L1 and the first capacitor C1 are energy storage elements. When the second switch tube V2 is closed, the first inductor L1 is charged, and the power supply output signal Vin supplies power to the first inductor L1 and the laser 40. When the second switch tube V2 is disconnected, the first inductor L1 discharges and outputs the power supply voltage V out , to power the laser 40, where V out The size of V is determined by the on-off time of the second switch tube V2. The longer the second switch tube V2 is closed, the shorter the off time is. outThe smaller it is, the larger it is. Therefore, the on-off time of the second switch tube V2 can be controlled based on the duty cycle of the control signal, thereby realizing the control of the power supply current of the laser 40. The two ends of the third resistor R3 are connected to different pins of the control unit 31. The third resistor R3 is a sampling resistor. Based on the voltage across the sampling resistor, the power supply current flowing through the laser 40 is obtained. If the power supply current of the laser 40 is less than the reference current value, the duty cycle of the drive signal Gate is reduced to increase the power supply current of the laser 40; conversely, if the power supply current of the laser 40 is greater than the reference current value, the duty cycle of the drive signal Gate is increased to reduce the power supply current of the laser 40, so that the power supply current of the laser 40 is maintained at the reference current value corresponding to the current power supply control signal ADIM.

[0080] Figure 6 This is an example in which the laser driving module 30 is a step-down circuit. In actual applications, the laser driving module 30 can also be a step-up capacitor, which is not limited in this embodiment.

[0081] It should be noted that, continue to refer to Figure 6 Before the laser driving module 30 is started, the electric quantity in the first inductor L1 and the first capacitor is zero. When starting, the first inductor L1 and the first capacitor need to be charged first. The first inductor L1 blocks the direct current, so the power supply current flowing through the laser 40 gradually increases until it reaches the reference current value. In the related art, when starting, the control unit 31 outputs a PWM signal of a fixed frequency as a control signal, so that before the power supply current flowing through the laser 40 reaches the reference current value, it needs to go through an intermittent charging process, so the time taken to reach the reference current value is longer. In this embodiment, when starting, a first control signal of a constant level is output. Since the first control signal is a constant level, the second switch tube V2 is continuously turned on, and the first inductor L1 and the first capacitor are continuously charged, so that the power supply current flowing through the laser 40 can quickly reach the reference current value, thereby improving the startup speed.

[0082] The following is an illustrative description based on actual scenarios: Figure 7 is a timing diagram of each control signal in the related art, such as Figure 7As shown, the invalid level is a low level and the valid level is a high level. At t1, the image enable signal EN changes from a low level to a high level, wherein when EN is at a low level, the laser drive module 30 enters a standby state, and thus the time t2-t1 is the time for the control unit 31 to start and respond. After t2, the control unit 31 starts to output a PWM control signal Gate, and the first inductor L1 and the first capacitor begin to charge. At this stage, the laser 40 has no current, and the duration of this stage is proportional to the storage capacity of the first capacitor. Thus, starting from t3, the power supply current of the laser 40 gradually increases until it reaches the reference current value at t4. Since the second open tube is disconnected when the PWM signal is at a low level, the first inductor L1 cannot be charged and can only be charged at a high level, so it takes multiple cycles for the power supply current of the laser 40 to reach the reference current value, which makes t4-t3 relatively long. Figure 8 The timing diagram of each control signal provided in the embodiment of the present application is as follows: Figure 8 As shown, from time t2, the control unit 31 outputs the first control signal Gate1 of a constant level, so that the first switch tube V2 can be continuously closed, and then the first capacitor is continuously charged. Therefore, the time t5-t2 for charging the first capacitor in this embodiment is shorter than t3-t2 in the related art. In addition, the power supply current at both ends of the laser 40 will also increase faster, so the time t6-t5 is shorter than the time t4-t3. Therefore, this embodiment can improve the startup speed of the laser driving module 30.

[0083] In some examples, Fig. 9 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application is shown in FIG. Fig. 9 As shown, the control unit 31 includes: a frequency control subunit 312 and a controller 311;

[0084] The controller 311 is connected to the display control module 20 and the driving unit 32;

[0085] The frequency control subunit 312 is connected to the controller 311, and is used to control the controller 311 to output a control signal of a first frequency when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal, and to control the controller 311 to output a control signal of a second frequency when the image enable signal is a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal; the first frequency is less than the second frequency, the control signal of the first frequency includes the first control signal, and the control signal of the second frequency is the second control signal.

[0086] This example exemplifies the generation scheme of the first control signal and the second control signal. The control unit 31 includes a frequency control subunit 312 and a controller 311; the controller 311 can be a processor with computing and processing functions, such as a microcontroller unit (MCU) or other processing chip, and the controller 311 has multiple input pins and output pins. A preset control program is written in the controller 311, and the controller 311 receives the dimming drive signal and the sampled power supply current of the laser 40; under the control of the control program, the controller 311 generates a control signal Gate based on the power supply current and the dimming drive signal.

[0087] In this example, the frequency control subunit 312 is used to control the frequency of the control signal Gate output by the controller 311. The control signal Gate in the related art is a fixed frequency. In this example, through the frequency control subunit 312, when the image enable signal EN changes from an invalid level to a valid level, that is, when it is started, the controller 311 is controlled to output a control signal of a first frequency until the power supply current of the laser 40 reaches the reference current value. After that, a control signal of a second frequency is output. The first frequency is less than the second frequency. As long as the first frequency is set small enough, it can be achieved that before the power supply current of the laser 40 reaches the reference current value, the control signal of the first frequency is always at a constant level, and this constant level is the first control signal.

[0088] For example, if the first frequency is 50 Hz and the second frequency is 500 kHz, the first frequency control signal maintains a constant level for 0.02 seconds, which is much longer than the time it takes for the power supply current of the laser 40 to reach the reference current value. Therefore, the first frequency control signal maintains a constant level for 0.02 seconds, which can be considered as the first control signal.

[0089] In this example, based on the frequency control subunit, the frequency of the control signal output by the controller is controlled to output a first control signal when the laser driving module is started, and output a second control signal after starting, thereby achieving a rapid response of the laser driving module.

[0090] As an implementation method, Fig.10 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application is shown in FIG. Fig.10 As shown, the display control module 20 is also connected to the frequency control subunit 312, and is used to output a first frequency adjustment signal when the image enable signal EN is converted from an invalid level to a valid level and the power supply signal does not reach the reference power supply value corresponding to the power supply control signal, and output a second frequency adjustment signal when the image enable signal is at a valid level and the power supply signal reaches the reference power supply value corresponding to the power supply control signal;

[0091] The frequency control subunit 312 is used to control the controller 311 to output a control signal of a first frequency when receiving a first frequency adjustment signal; and to control the controller 311 to output a control signal of a second frequency when receiving a second frequency adjustment signal.

[0092] In this embodiment, the display control module 20 obtains the state of the laser driving module 30 through the image enable signal EN and the power supply current of the laser 40, and outputs a first frequency adjustment signal when the laser driving module 30 is started, and outputs a second frequency adjustment signal after starting. The frequency control subunit 312 controls the controller 311 to output control signals of different frequencies based on different frequency adjustment signals. Among them, the display control module 20 obtains the power supply current of the laser 40 in a variety of ways. For example, the controller 311 can send the power supply current of the laser 40 collected through the first resistor R1 to the display control module 20, so that the display control module 20 obtains the power supply current of the laser 40. The display control module 20 can also directly collect the voltage across the first resistor R1 to obtain the power supply current of the laser 40.

[0093] In one example, Fig.11 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application is shown in FIG. Fig.11 As shown, the frequency control subunit 312 includes: an external resistor subunit 314,

[0094] The external resistor subunit 314 is connected to the frequency setting pins of the display control module 20 and the controller 311, and is used to adjust the resistance of the external resistor subunit 314 to a first resistance value when receiving a first frequency adjustment signal; and to adjust the resistance of the external resistor subunit 314 to a second resistance value when receiving a second frequency adjustment signal;

[0095] The controller 311 is used to generate a control signal of a first frequency based on the external resistor subunit 314 of a first resistance value, and to generate a control signal of a second frequency based on the external resistor subunit 314 of a second resistance value.

[0096] In this example, the external resistor subunit 314 is connected between the display control module 20 and the frequency setting pin Fset of the controller 311. The Fset pin of the controller 311 is the external oscillation frequency timing resistor pin of the controller 311. The resistance value of the external resistor connected to the Fset pin is usually used to set the frequency of the control signal. The calculation formula of the frequency f of the control signal can be: f=1 / Rset*CT, where Rset is the resistance value of the external resistor of the Fset pin of the controller 311, and CT is the capacitance of the internal capacitor of the controller 311. In the related art, Rset is a fixed value, so the frequency of the control signal is a fixed value. In this embodiment, the external resistor subunit 314 is connected to the Rset pin. Since the resistance value of the external resistor subunit 314 changes based on the frequency adjustment signal Ft, the frequency of the drive signal also changes with the resistance value of the external resistor subunit 314 during operation, so that the controller 311 can output a second control signal of different frequencies.

[0097] As an optional implementation, continue to refer to Fig.11 The external resistor subunit 314 includes: a first switch tube V2, a first resistor R1 and a second resistor R2,

[0098] One end of the first switch tube V2 is connected to the frequency setting pin of the controller 311, the other end of the first switch tube V2 is connected to one end of the first resistor R1, and the control end of the first switch tube V2 is connected to the display control module 20;

[0099] The other end of the first resistor R1 is grounded;

[0100] One end of the second resistor R2 is connected to one end of the first switch tube V2 and the frequency setting pin of the controller 311 , and the other end of the second resistor R2 is connected to the other end of the first resistor R1 and is grounded.

[0101] In combination with specific scenarios, the first switch tube V1 can be a P-type or N-type field effect tube, or a triode, and this embodiment does not limit this. Take a P-type triode as an example. When working, the control end of the first switch tube V1 receives a frequency adjustment signal Ft, wherein the first frequency adjustment signal and the second frequency adjustment signal are level signals with different amplitudes. Based on different levels, the triode is controlled to work in different working areas, thereby controlling the impedance of the triode. For example, when the triode works in the saturation area, the impedance of the triode is the smallest. When the triode works in the amplification area, the impedance of the triode increases as the amplitude of the level decreases. When the triode is disconnected, the impedance is the largest. The first resistor R1 is connected in series with the first switch tube V1, so the resistance of the circuit where the first resistor R1 and the first switch tube V1 are located also changes accordingly. Among them, the first resistor R1 can also prevent the circuit from short-circuiting when the first switch tube V1 works in the saturation area. The second resistor R2 is connected in parallel with the first switch tube V1. When the impedance of the first switch tube V1 becomes smaller, the resistance of the external resistor subunit 314 also becomes smaller accordingly. Therefore, the external resistor subunit 314 can control the change of its own resistance based on the frequency adjustment signal Ft.

[0102] In the above embodiment, the startup speed of the laser driving module 30 is increased by outputting a constant first control signal during startup. Figure 7 , Figure 8 As shown, the laser driving module 30 is in a standby state when receiving an image enable signal of an invalid level, so when starting, the controller 311 needs a period of response time. In order to further improve the startup speed of the laser driving module 30, in some embodiments,

[0103] The control unit 31 is further configured to enter the standby state when the first duration of the image enable signal being at the invalid level exceeds a predetermined duration; otherwise, not enter the standby state; the predetermined duration is not less than the cycle of the image enable signal.

[0104] As can be seen from the above embodiments, the image enable signal is a PWM signal, and its cycle is the working cycle of the laser 40. Each cycle of the image enable signal includes an invalid level and an effective level. Taking the laser projection device including the three-color laser 40 as an example, the red laser 40 is lit when R-EN is at an effective level; and when R-EN is at an invalid level, it is not lit, and one of the other two lasers 40 is lit, and the three lasers 40 are lit in sequence in each cycle. It can be understood that when R-EN is at an invalid level, there are two possible situations, one is: G-EN or B-EN is at an effective level, in which case, the current invalid level is the level in the normal cycle of the image enable signal. The other is: G-EN or B-EN is also at an invalid level, that is, the laser projection device is not working, and all lasers 40 are not lit. In this embodiment, a predetermined duration exceeding the cycle of the image enable signal is set. When the first duration of the image enable signal being at an invalid level exceeds the predetermined duration, it indicates that the current laser projection device is not working, and the control unit 31 enters the standby state. When the first time duration does not exceed the predetermined time duration, it is considered that the current invalid level is the level within the normal cycle of the image enable signal. In this scenario, the control unit 31 does not enter the standby state, so that when each laser 40 is started in turn within the cycle, it does not need to be restarted, thereby further improving the startup speed of the laser driving module 30.

[0105] In some optional examples, Fig.12 A schematic diagram of the structure of another laser projection device provided in an embodiment of the present application is shown in FIG. Fig.12 As shown, the control unit 31 may further include: a timing subunit 313;

[0106] The timing subunit 313 is connected to the controller 311 and the display control module 20, and is used to record the first duration, and send a standby signal to the controller 311 when the first duration exceeds a predetermined duration;

[0107] The controller 311 is used to enter the standby state when receiving the standby signal; otherwise, it does not enter the standby state.

[0108] In this example, the timing subunit 313 may be a processor with a timing function, and the timing subunit 313 may be integrated in the display control module 20, or integrated in the controller 311, or may be connected as an independent unit to the controller 311 and the display control module 20. The timing subunit 313 may send a standby signal to the controller 311 when the first duration exceeds the first duration, so that the controller 311 enters the standby state based on the standby signal.

[0109] The following will provide an exemplary introduction to the startup process of the laser driving module 30 in combination with various embodiments: the laser projection device includes three lasers 40, the invalid level is a low level, and the valid level is a high level; the display control module 20 sends an image enable signal EN and a power supply control signal ADIM to the laser driving modules 30 corresponding to the three lasers 40 respectively, the image enable signal of the laser 40 driving module corresponding to the red laser 40 is R-EN, the image enable signal of the laser 40 driving module corresponding to the green laser 40 is G-EN, and the image enable signal of the laser 40 driving module corresponding to the blue laser 40 is B-EN. Fig.13 Another timing diagram of each control signal provided in the embodiment of the present application is as follows: Fig.13 As shown, before time t2, B-EN is at a high level, the blue laser 40 is on, G-EN and R-EN are at a low level, and the green laser 40 and the blue laser 40 are not working. At time t1, R-EN changes from a low level to a high level, B-EN and G-EN are at a low level, the display control module 20 outputs a first frequency adjustment signal to the external resistor subunit 314 corresponding to the red laser 40, the resistance value of the external resistor unit corresponding to the red laser 40 increases, and the controller 311 corresponding to the red laser 40 outputs a low-frequency second control signal, and the low-frequency second control signal includes a first control signal of a constant level; the controller 311 in the laser driving module 30 corresponding to the red laser 40 is not in standby before time t1, and can be directly started after power-on, so the startup time of the controller 311 is not required at present. In the stage t7-t1, based on the first control signal Gate1 of a constant level, the first capacitor and the first inductor L1 in the driving unit 32 corresponding to the red laser 40 are quickly charged. From the moment t7, the power supply current flowing through the red laser 40 gradually increases. The reference current value corresponding to the current power supply control signal ADIM is 3A. In the stage t8-t7, the power supply current of the red laser 40 increases from 0 to 3A. At the moment t8, the laser driving module 30 corresponding to the red laser 40 completes the startup. The display control module 20 outputs a second frequency adjustment signal, the resistance value of the external resistor subunit 314 decreases, and the controller 311 corresponding to the red laser 40 outputs a high-frequency second control signal. The laser driving module 30 adjusts the output power supply voltage based on the duty cycle of the high-frequency second control signal Gate2, thereby controlling the brightness of the laser 40.

[0110] Then, at time t9, R-EN becomes low level, G-EN becomes high level, the red laser 40 gradually turns off, and the green laser 40 gradually turns on. The timing subunit 313 records the duration of R-EN being low level. If the duration of the low level reaches a predetermined duration, it indicates that the current laser projection device is not working, and the controller 311 is controlled to enter the standby state until the laser projection device works again.

[0111] In the laser projection device provided in this embodiment, the laser driving module includes a control unit and a driving unit, the control unit is connected to the display control module and the driving unit, and the control unit outputs a first control signal of a constant level when the image enable signal is converted from an invalid level to an effective level, until the power supply signal reaches the reference power supply value corresponding to the power supply control signal, and after the power supply signal reaches the reference power supply value corresponding to the power supply control signal and the image enable signal is at an effective level, the second control signal is output as a PWM signal, and the driving unit generates a power supply signal based on the control signal. In this solution, a first control signal of a constant level is output when the laser driving module is started, and a second control signal of a PWM signal is output after starting. The first control signal of a constant level can speed up the charging speed of the energy storage element relative to the PWM signal, so that the power supply signal can quickly reach the reference power supply value, thereby increasing the startup speed of the laser driving module, and thus increasing the lighting speed of the laser.

[0112] In another embodiment of the present application, a laser driving module is provided, the laser driving module comprising: a control unit and a driving unit;

[0113] The control unit is connected to the display control module and the driving unit, and is used to generate a control signal based on the image enable signal and the power supply control signal; the driving unit is connected to the corresponding laser, and is used to generate a power supply signal to supply power to the corresponding laser based on the control signal;

[0114] The control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to an effective level and the power supply signal does not reach the reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at an effective level and the power supply signal reaches the reference power supply value corresponding to the power supply control signal. 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 repeated here.

[0115] In another embodiment of the present application, a control method is provided, which 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. Fig.14 A flow chart of a control method for a laser projection device provided in an embodiment of the present application is shown as follows: Fig.14 As shown, the control method of this embodiment may include:

[0116] S1401: The laser emits a laser beam to provide an illumination beam for the device;

[0117] S1402: The display control module outputs a dimming drive signal and an image display drive signal; the dimming drive signal includes an image enable signal and a power supply control signal;

[0118] S1403: The light modulation device modulates the laser beam under the drive of the image display driving signal;

[0119] S1404: The projection lens receives the modulated laser beam and projects an image;

[0120] S1405: The control unit generates a control signal based on the image enable signal and the power supply control signal;

[0121] S1406: The driving unit generates a power supply signal for supplying power to the corresponding laser based on the control signal.

[0122] The control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

[0123] The control method provided in this embodiment can use the modules of the laser projection device in the above embodiments to execute the process. The implementation method and technical effect are similar, and this embodiment will not be repeated here.

[0124] In some examples, S1405 includes:

[0125] a frequency control subunit, configured to control the controller to output a control signal of a first frequency when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal;

[0126] A frequency control subunit controls the controller to output a control signal of a second frequency when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal; the first frequency is less than the second frequency, the control signal of the first frequency includes the first control signal, and the control signal of the second frequency is the second control signal.

[0127] 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.

[0128] Fig.15 This is a schematic diagram of the hardware structure of the electronic device provided in this application. Fig.15 As shown, the electronic device 500 is used to implement the operation corresponding to the laser driving circuit in any of the above method embodiments. The electronic device 500 of this embodiment may include: a memory 501 and a processor 502;

[0129] Memory 501, used for storing computer programs;

[0130] The processor 502 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.

[0131] Optionally, the memory 501 may be independent or integrated with the processor 502 .

[0132] When the memory 501 is a device independent of the processor 502, the electronic device 500 may further include:

[0133] The bus 503 is used to connect the memory 501 and the processor 502 .

[0134] Optionally, this embodiment may further include: a communication interface 504, which may be connected to the processor 502 via the bus 503. The processor 502 may control the communication interface 504 to implement the above-mentioned receiving and sending functions of the electronic device 500.

[0135] The present application also provides a computer-readable storage medium, the computer-readable storage medium includes a computer program, and the computer program is used to implement the control method in the above embodiment.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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: A laser light source, a light modulation device, a projection lens, a display control module, and at least one laser driving module. The laser light source includes at least one laser, and the laser 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 drive signal and an image display drive signal; the dimming drive signal includes an image enable signal and a power supply control signal; 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 laser driving module includes a control unit and a driving unit; the control unit is connected to the display control module and the driving unit, and is used to generate a control signal based on the image enable signal and the power supply control signal; the driving unit is connected to the corresponding laser, and is used to generate a power supply signal to supply power to the corresponding laser based on the control signal; The control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; The second control signal is a PWM signal output by the control unit when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

2. The laser projection device according to claim 1, characterized in that: The control unit comprises: a frequency control subunit and a controller; The controller is connected to the display control module and the driving unit; The frequency control subunit is connected to the controller, and is used to control the controller to output a control signal of a first frequency when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal, and to control the controller to output a control signal of a second frequency when the image enable signal is a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal; the first frequency is less than the second frequency, the control signal of the first frequency includes the first control signal, and the control signal of the second frequency is the second control signal.

3. The laser projection device according to claim 2, characterized in that: The display control module is further connected to the frequency control subunit, and is used to output a first frequency adjustment signal when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal, and output a second frequency adjustment signal when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal; The frequency control subunit is used to control the controller to output a control signal of a first frequency when receiving a first frequency adjustment signal; And when receiving the second frequency adjustment signal, the controller is controlled to output a control signal of the second frequency.

4. The laser projection device according to claim 3, characterized in that: The frequency control subunit includes: an external resistance subunit, The external resistor subunit is connected to the display control module and the frequency setting pin of the controller, and is used to adjust the resistance of the external resistor subunit to a first resistance value when receiving the first frequency adjustment signal; and to adjust the resistance of the external resistor subunit to a second resistance value when receiving the second frequency adjustment signal; The controller is used to generate a control signal of a first frequency based on the external resistor subunit with a first resistance value; and to generate a control signal of a second frequency based on the external resistor subunit with a second resistance value.

5. The laser projection device according to claim 4, characterized in that: The external resistor subunit includes: a first switch tube, a first resistor and a second resistor. One end of the first switch tube is connected to the frequency setting pin of the controller, the other end of the first switch tube is connected to one end of the first resistor, and the control end of the first switch tube is connected to the display control module; The other end of the first resistor is grounded; One end of the second resistor is connected to one end of the first switch tube and the controller frequency setting pin, and the other end of the second resistor is connected to the other end of the first resistor and is grounded.

6. The laser projection device according to claim 2, characterized in that: The control unit is further configured to enter a standby state when a first duration during which the image enable signal is at an invalid level exceeds a predetermined duration; otherwise, not enter a standby state; and the predetermined duration is not less than a period of the image enable signal.

7. The laser projection device according to claim 6, characterized in that: The control unit further comprises: a timing subunit; The timing subunit is connected to the controller and the display control module, and is used to record the first duration, and send a standby signal to the controller when the first duration exceeds a predetermined duration; The controller is used for entering the standby state when receiving the standby signal; otherwise, the controller does not enter the standby state.

8. A control method, characterized in that: The control method is applied to the laser projection device according to any one of claims 1 to 7, and the method comprises: The laser emits a laser beam to provide an illumination beam for the device; The display control module outputs a dimming drive signal and an image display drive signal; the dimming drive signal includes an image enable signal and a power supply control signal; The light modulation device modulates the laser beam under the drive of the image display drive signal; The projection lens receives the modulated laser beam and projects an image; The control unit generates a control signal based on the image enable signal and the power supply control signal; The driving unit generates a power supply signal for supplying power to the corresponding laser based on the control signal; The control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

9. The control method according to claim 8, characterized in that: The control unit includes: a frequency control subunit and a controller; the control unit generates a control signal based on the image enable signal and the power supply control signal, including: The frequency control subunit controls the controller to output a control signal of a first frequency when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; The frequency control subunit controls the controller to output a control signal of a second frequency when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal; the first frequency is less than the second frequency, the control signal of the first frequency includes the first control signal, and the control signal of the second frequency is the second control signal.

10. A laser driving module, characterized in that: The laser driving module comprises: a control unit and a driving unit; The control unit is connected to the display control module and the driving unit, and is used to generate a control signal based on the image enable signal and the power supply control signal; the driving unit is connected to the corresponding laser, and is used to generate a power supply signal to supply power to the corresponding laser based on the control signal; The control signal includes a first control signal and a second control signal; the first control signal is a constant level signal output by the control unit when the image enable signal is converted from an invalid level to a valid level and the power supply signal does not reach a reference power supply value corresponding to the power supply control signal; the second control signal is a PWM signal output by the control unit when the image enable signal is at a valid level and the power supply signal reaches a reference power supply value corresponding to the power supply control signal.

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