WO2020248576A1 - Laser drive circuit, laser display device, and laser drive method - Google Patents

Abstract

Provided in the present application are a laser drive circuit, a laser display device, and a laser drive method. The circuit comprises: a first input end of the laser drive circuit is used for receiving an analogue dimming signal used for regulating the amplitude of the laser assembly current. A second input end of the laser drive circuit is used for receiving a high frequency pulse dimming signal used for controlling the presence or absence of the laser assembly current, the frequency range of the high frequency pulse dimming signal being 18K Hz to 300M Hz. On the basis of the analogue dimming signal and the high frequency pulse dimming signal, the laser drive circuit can drive the laser assembly at high speed to emit light or stop emitting light in order to solve the problem of speckle, improving the performance of the laser drive circuit.

Description

Laser driving circuit, laser display device and laser driving method

This application is required to be submitted to the Chinese Patent Office on June 13, 2019, the application number is 201910509354.1, the application name is "Laser drive circuit, laser display device and laser drive method", and the application number is submitted to the Chinese Patent Office on June 13, 2019 It is 201920888395.1, the priority of the Chinese patent application named "Laser Drive Circuit and Laser Display Device", the entire content of which is incorporated in this application by reference.

Technical field

This application relates to the field of electronic technology, and in particular to a laser driving circuit, a laser display device, and a laser driving method.

Background technique

Because of its good monochromaticity, the laser has an unparalleled advantage in the color of the display field, and the life span of tens of thousands of hours has also greatly improved the market competitiveness of laser TVs. At present, the laser display market is in a period of rapid development, and technological changes are changing with each passing day. At present, the mainstream products are still laser TVs with a monochromatic laser plus phosphor solution. However, with the development of laser technology, two-color and three-color laser TVs have become The future direction of development.

Regardless of whether it is a monochromatic, two-color or three-color laser TV, the extremely narrow spectral line width of the laser will introduce a longer coherence length (or coherence time). If the decoherence process is not performed, it will be directly displayed on the projection screen. The user will see the image of obvious interference fringes, namely speckle. Generally, speckle has an extremely serious impact on image quality. For example, for three-color pure laser TVs, since the three primary colors of red R, green G, and blue B are all lasers, each of them will produce speckles. Among them, the red laser is due to the line width. The longest, the longest coherence length (coherence time), the most serious interference, and the most obvious speckle. It can also be said that the solution of the speckle problem is directly related to the necessary conditions for the launch of the three-color laser TV on the market.

Summary of the invention

The present application provides a laser driving circuit, a laser display device, and a laser driving method to solve the problem of low driving performance of the existing laser TV due to the speckle problem.

In the first aspect, this application provides a laser drive circuit, including:

The first input terminal of the laser driving circuit is used to receive an analog dimming signal, and the analog dimming signal is used to adjust the amplitude of the laser component current; the second input terminal of the laser driving circuit is used to receive high-frequency pulses Dimming signal, the high-frequency pulse dimming signal is used to control the presence or absence of the current of the laser assembly, the frequency range of the high-frequency pulse dimming signal is between 18K HZ-300M HZ and the high-frequency pulse dimming signal The duty cycle range of the optical signal is greater than 50%, or the frequency range of the high-frequency pulse dimming signal is between 18K HZ-300M HZ; the laser driving circuit is used for the analog dimming signal and The high-frequency pulse dimming signal drives the laser assembly to emit light or stop emitting light.

In a second aspect, the present application provides a laser driving circuit, including:

The first input terminal of the laser driving circuit is used to receive an analog dimming signal, and the analog dimming signal is used to adjust the amplitude of the laser component current; the second input terminal of the laser driving circuit is used to receive high-frequency pulses A dimming signal, the high-frequency pulse dimming signal is used to control the presence or absence of the laser component current; the first power supply terminal of the laser drive circuit is connected to a power circuit, and the power circuit is used to provide a preset level , The first power supply terminal of the laser drive circuit is also connected to the first input terminal of the laser component, the second power supply terminal of the laser drive circuit is connected to the second input terminal of the laser component, and the laser drive The ground terminal of the circuit is grounded; the laser driving circuit is used for driving the laser assembly to emit light or stop emitting light according to the analog dimming signal and the high-frequency pulse dimming signal.

In a third aspect, the present application provides a laser display device, including: M laser drive circuits as described in the embodiment of the first aspect, or M laser drive circuits as described in the embodiment of the second aspect, M is a positive integer.

The laser display device also includes: a power supply circuit, a digital micro-mirror device DMD drive circuit, a video system-on-chip TV SOC, a laser component, an optical processor, a DMD and a lens.

Wherein, the power supply circuit is respectively connected to the power supply terminal of the TV SOC and the power supply terminal of each laser drive circuit, the output terminal of the TV SOC is connected to the input terminal of the DMD drive circuit, and the DMD drive circuit The first output terminal is connected to the first input terminal of each laser drive circuit, the second output terminal of the DMD drive circuit is connected to the second input terminal of each laser drive circuit, and the third output terminal of the DMD drive circuit Is connected to the input end of the DMD, and the output end of each laser drive circuit is connected to the input end of the laser assembly; the power supply circuit is used to supply power to the TV SOC and each laser drive circuit, and to A laser drive circuit provides a preset level; the TV SOC is used to provide a video signal to the DMD drive circuit; the DMD drive circuit is used to provide the video signal to the DMD so that the The DMD is flipped, and according to the video signal, an analog dimming signal and a high-frequency pulse dimming signal are sent to each laser driving circuit; each laser driving circuit is used for according to the analog dimming signal and the high-frequency pulse The dimming signal drives the laser assembly to emit light and is collected by the optical processor to illuminate the DMD, so that the DMD is projected on the projection device through the lens.

In a fourth aspect, the present application provides a laser driving method, which is applied to the laser driving circuit according to the above-mentioned embodiment of the first aspect or the laser driving circuit according to the above-mentioned second aspect, the method includes :

Receive an analog dimming signal and a high-frequency pulse dimming signal, the analog dimming signal is used to adjust the amplitude of the laser assembly current, and the high-frequency pulse dimming signal is used to control the presence or absence of the laser assembly current, so The frequency range of the high-frequency pulse dimming signal is between 18KHZ-300MHZ, or the frequency range of the high-frequency pulse dimming signal is between 18KHZ-300MHZ and the frequency of the high-frequency pulse dimming signal The duty cycle range is greater than 50%; according to the analog dimming signal and the high-frequency pulse dimming signal, the laser assembly is driven to emit light or to stop emitting light.

Description of the drawings

In order to more clearly describe the technical solutions in the present application or related technologies, the following will briefly introduce the drawings that need to be used in the embodiments or related technical descriptions. Obviously, the drawings in the following description are of the present application For some embodiments, for those of ordinary skill in the art, other drawings can be obtained from these drawings without creative labor.

Fig. 1 is a schematic structural diagram of a laser display device provided by this application;

2 is a schematic diagram of the circuit structure of the laser display device provided by this application;

3 is a schematic diagram of the structure of the laser driving circuit provided by this application;

4 is a schematic diagram of the structure of the laser driving circuit provided by this application;

FIG. 5 is a schematic structural diagram of a laser driving circuit provided by this application;

6 is a schematic diagram of the waveforms of the analog dimming signal, the high-frequency pulse dimming signal, and the control signal in the laser driving circuit provided by this application;

FIG. 7 is a schematic circuit diagram of a laser driving circuit that generates a control signal based on an analog dimming signal and a high-frequency pulse dimming signal provided by this application;

FIG. 8 is a schematic circuit diagram of the switch circuit in the laser driving circuit provided by this application;

9 is a schematic structural diagram of a laser driving circuit including a protection circuit provided by this application;

FIG. 10 is a schematic circuit diagram of the protective electric circuit in the laser driving circuit provided by this application;

FIG. 11 is a schematic structural diagram of a laser driving circuit provided by this application;

FIG. 12 is a schematic structural diagram of a laser driving circuit provided by this application;

FIG. 13 is a schematic diagram of the circuit architecture of the laser display device provided by this application;

FIG. 14 is a schematic flowchart of a laser driving method provided by this application;

FIG. 15 is a schematic flowchart of a laser driving method provided by this application.

FIG. 16 is a schematic diagram of the hardware structure of the electronic device provided by this application.

Reference signs:

10—Light source;

11—Optical machine;

12—Projection lens;

13—Projection screen;

20—Power circuit;

21—Digital Micromirror Devices (DMD) drive circuit;

22—Video System on Chip (TV System on Chip, TV SOC);

23—Laser assembly;

24—Optical processor;

25—DMD;

26—Laser drive circuit;

27—Lens;

26a—Control circuit;

26b—Switch circuit;

26d—Charge and discharge circuit;

26c—Current detection circuit;

26e—Protection circuit.

Detailed ways

The technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In the description of the embodiments of this application and the drawings, it should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", and "vertical" The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship described in the drawings, and are only for the convenience of describing the application and simplifying the description. It does not indicate or imply that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

The terms "first", "second" and "third" are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the application described here can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Unless otherwise clearly specified and limited, the terms "installation", "connected" and "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood under specific circumstances.

At present, in the field of laser display, there are many ways to deal with the speckle problem. Most of the methods are to reduce the speckle in the optical path, such as adding a diffuser to homogenize the speckle, or adding a polarizing device to change the beam However, the above methods have certain limitations in the actual application process. For example, in a three-color laser TV, because the speckle conditions of the three primary colors are different, the effect of setting the same de-speckle device in the optical path on each primary color is different, and it is difficult to find suitable technical specifications to meet each primary color at the same time. It is difficult to find a suitable intermediate specification for the speckle elimination requirements.

Therefore, how to improve the driving performance of the laser driving circuit is an urgent problem to be solved.

First introduce the basic working principle of the laser: Figure 1 is a schematic diagram of the structure of the laser display device provided by this application. As shown in Figure 1, the laser display device may include: a light source 10, an optical machine 11, a projection lens 12, and a projector connected in sequence Screen 13. Among them, the light source 10 is used to emit a laser beam. The optical machine 11 is used to modulate the laser beam emitted by the light source 10 to generate an image beam, and project the image beam to the projection lens 12. The projection lens 12 is used for imaging the image beam. The projection screen 13 is arranged on the light exit path of the projection lens 12, and the projection beam formed by the projection lens 12 forms a projection image on the projection screen 13.

Wherein, the light source 10 may be a laser light source, for example, independent red (R), green (G), and blue (B) three primary color laser light sources. The light source may be emitted by a semiconductor laser or a solid-state laser. Taking semiconductor lasers as an example, semiconductor lasers can include resonant cavity, gain medium and pump source. Its working principle is excitation mode. It uses laser active medium (such as semiconductor material, that is, electrons) to transition between energy bands to emit light. The cleavage surface forms two parallel reflecting mirrors as resonant cavity mirrors to form a waveguide resonant cavity, which enables light oscillation, feedback, and radiation amplification of the generated light, and outputs a laser beam (referred to as laser for short).

At present, laser display devices (such as laser TVs, projectors) that use lasers are increasingly popular in various fields such as households, offices, hospitals, academics, biology, and metallurgy. Moreover, users have higher and higher requirements for the picture quality of laser display devices. Generally, the better the picture color of the laser display device, the laser's spectrum needs to be as narrow as possible, such as a single wavelength laser. However, when a laser with a narrower spectrum is scattered on a rough surface (such as tiny protrusions and depressions on the screen), the coherence of the laser will become stronger, which is likely to cause speckle problems, that is, the formation of light and dark spots, which leads to the laser The performance of the display device deteriorates.

In order to improve the performance of the laser display device, therefore, embodiments of the present application provide a laser driving circuit, a laser display device, and a laser driving method, which are applied to various scenarios where a laser is driven to emit a laser, and can improve the performance of the laser. Among them, the embodiments of the present application do not limit the specific types and numbers of lasers. For example, the laser may be a semiconductor laser, a gas laser, a fixed laser, and the like. In the following, several embodiments are used to describe the technical solutions of the embodiments of the present application.

It is worth noting that the laser driving circuit of the embodiment of the present application is used to drive one or more lasers that emit lasers of different wavelengths (hereinafter may also be described as "laser beams" or "light beams"). For example, the laser assembly may include three lasers emitting red (R), green (G), and blue (B) colors with three wavelengths.

Among them, the laser display device may include, but is not limited to, a laser TV, a projector device of a laser beam scanning system, a head-mounted display, a laser liquid crystal TV, an organic laser TV, and a stereo (three-dimensional) display.

For ease of description, FIG. 2 is only used to illustrate the specific circuit architecture of the laser display device. As shown in Figure 2, the laser display device may include: a power supply circuit 20, a DMD drive circuit 21, a TV SOC 22, a laser component 23, an optical processor 24, a DMD 25, M laser drive circuits 26 and a lens 27, where M is positive Integer.

In the embodiment of the present application, the power supply circuit 20 is respectively connected to the power supply terminal of the TV SOC 22 and the power supply terminal of each laser drive circuit 26. The power supply circuit 20 is used to supply power to the TV SOC 22 and each laser drive circuit 26, and to each The laser driving circuit 26 provides a preset level.

Among them, the embodiment of the present application does not limit the specific number and type of the power supply circuit 20 and the TV SOC 22.

In the embodiment of the present application, the TV SOC 22 can receive video signals through various communication interfaces (such as a USB interface, a serial interface, a WIFI interface, etc.), and the output terminal of the TV SOC 22 is connected to the input terminal of the DMD drive circuit 21. The DMD driving circuit 21 is supplied with a video signal.

Among them, the embodiment of the present application does not limit the specific number and type of the DMD driving circuit 21.

In the embodiment of the present application, the first output terminal of the DMD driving circuit 21 is connected to the first input terminal of the laser driving circuit 26, so that the DMD driving circuit 21 can send an analog dimming signal to each laser driving circuit 26 according to the video signal. It is denoted as "ADIM signal", where the ADIM signal is used to adjust the amplitude of the current of the laser component 23 so that the current of the laser component 23 can be adjusted linearly from 0-100%.

In the embodiment of the present application, the second output terminal of the DMD driving circuit 21 is connected to the second input terminal of the laser driving circuit 26, so that the DMD driving circuit 21 can send a PWM signal to each laser driving circuit 26 according to the video signal, where: The PWM signal is used to control the presence or absence of current in the laser assembly 23.

Optionally, the frequency range of the PWM signal is set between 18KHZ-300MHZ, so that the laser assembly 23 can switch from emitting to stopping emitting at a high frequency. Optionally, the duty cycle range of the PWM signal is greater than 50%.

In the embodiment of the present application, the third output terminal of the DMD driving circuit 21 is connected to the input terminal of the DMD 25, so that the DMD driving circuit 21 can provide a video signal to the DMD 25, so that the DMD 25 can perform corresponding inversion according to the video signal.

Among them, the embodiments of this application do not limit the specific number and types of DMD 25. The DMD25 has a tiny lens rotating (10um), which can control the light to pass through or not to pass through the lens, and then generate the gray scale of the image.

In the embodiment of the present application, the output terminal of each laser driving circuit 26 is connected to the input terminal of the laser component 23, so that each laser driving circuit 26 can drive the laser component to emit light at a high frequency according to the ADIM signal and the PWM signal. In this way, the light-emitting laser assembly 23 can be irradiated on the flipped DMD 25 through the optical processor 24, so that the DMD 25 can be projected on the projection device through the lens 27 to realize the display of video signals and complete the entire laser display device. Show the process.

Among them, the embodiment of the present application does not limit the specific number and type of the laser components 23. In some embodiments, the types of lasers in the laser assembly 13 may include red lasers and blue lasers, or red lasers, blue lasers, and green lasers.

For example, taking a three-color laser as an example, the laser assembly 23 may include a red laser 231 to generate a red laser; a blue laser 232 to generate a blue laser; and a green laser 233 to generate a green laser.

In addition, each laser in the laser assembly 23 can be connected in parallel with a capacitor, which can reduce the ripple current on the corresponding laser, so that the laser can emit light better.

The laser driving circuit 26 in FIG. 2 may include multiple implementations. Hereinafter, in conjunction with FIGS. 3 to 12, a number of embodiments are used to describe in detail the specific structure of the laser driving circuit 26 of the embodiment of the present application.

Example one

The first embodiment provides an implementation of the laser driving circuit 26. As shown in FIG. 3, in the embodiment of the present application, the laser driving circuit 26 may include two input terminals, a first input terminal 261 and a second input terminal 262, respectively.

The first input terminal 261 of the laser driving circuit 26 is used to receive an ADIM signal, and the ADIM signal is used to adjust the amplitude of the current of the laser component 23 so that the current of the laser component 23 can be linearly adjusted from 0-100%.

The second input terminal 262 of the laser driving circuit 26 is used to receive a high-frequency pulse dimming signal, which is denoted as a "PWM signal". The PWM signal is used to control the current of the laser assembly 23. The frequency range of the PWM signal is set at 18KHZ Between -300M Hz, the laser assembly can switch from emitting to stopping emitting at high frequency.

In addition, in some embodiments, the duty cycle range of the PWM signal is greater than 50%.

In the embodiments of this application, based on the respective characteristics of the ADIM signal and the PWM signal, the laser drive circuit can drive the laser component to emit light or stop emitting light at a high frequency according to the ADIM signal and the PWM signal, thereby changing the constant current characteristics of the traditional laser drive circuit. The laser drive circuit of the application embodiment generates currents of different amplitudes and controls the presence or absence of current of the laser components at high speed. The laser drive circuit changes the "constant current" characteristics of the drive current, that is, the laser drive circuit generates currents of different amplitudes. In addition, the laser drive circuit controls the drive laser component to emit light or stop emitting light at a high speed, so that the laser drive circuit sometimes does not input the drive current to drive the laser, which interferes with the resonance of the laser in the laser cavity of the laser component, and affects the laser output light wave The "single wavelength" feature, that is, the laser spectrum obtained by the laser will become wider, and the coherence between different wavelengths of light will be worse, to solve the speckle problem, improve the driving performance of the laser driving circuit, and improve the laser assembly Display performance.

Example two

The second embodiment provides another implementation of the laser driving circuit 26. As shown in FIG. 4, in the embodiment of the present application, the laser driving circuit 26 may include two input terminals, a first input terminal 261 and a second input terminal 262, respectively.

The first input terminal 261 of the laser driving circuit is used to receive the ADIM signal, and the ADIM signal is used to adjust the amplitude of the laser component current. It should be noted that the above ADIM signal can be the ADIM signal in the first embodiment, so that the current of the laser component can be adjusted linearly from 0-100%, or the ADIM signal in the related technology can be used to keep the current of the laser component constant. The embodiments of this application do not limit this.

The second input terminal 262 of the laser driving circuit is used to receive a PWM signal, and the PWM signal is used to control the presence or absence of current of the laser assembly, so that the laser assembly can switch from emitting light to stopping emitting light.

It should be noted that the frequency range of the above-mentioned PWM signal can be the frequency range of the PWM signal in the first embodiment, or the frequency range of the PWM signal in the related art, which is not limited in the embodiment of the application.

In the embodiment of the present application, the power supply circuit 20 can provide a preset level to the laser drive circuit 26 by being connected to the first power supply terminal 263 of the laser drive circuit 26. The amplitude of the preset level can be set according to actual conditions, which is not limited in the embodiment of the present application.

Further, the first power supply terminal 263 of the laser drive circuit 26 is also connected to the first input terminal 2311 of the laser component 23, the second power supply terminal 264 of the laser drive circuit 26 is connected to the second input terminal 2312 of the laser component 23, and the laser The ground terminal 265 of the driving circuit 26 is grounded.

Based on the above description, since the laser drive assembly 26 drives the laser assembly 23 to emit light through the first input terminal and the second input terminal of the laser assembly 23, and the first input terminal of the laser assembly 23, the first power supply terminal of the laser drive circuit 26, and The power supply circuit 20 is connected, and the second input end of the laser component 23 is connected to the second power supply end of the laser drive circuit 26. Therefore, the laser drive circuit 26 can use the preset level to drive the laser according to the characteristics of the ADIM signal and the PWM signal. The laser in the component 23 emits or stops emitting, the amplitude of the preset level provided by the power circuit 20 does not need to be too large, and the laser drive circuit 23 does not need to increase the amplitude of the preset level, so that the laser assembly 23 can work normally. Thus, the loss of the laser driving circuit 26 is saved, and the driving performance of the laser driving circuit 26 is improved.

In the laser drive circuit provided by the embodiment of the present application, the first power supply terminal of the laser drive circuit receives the power supply circuit to provide a preset level, the ground terminal of the laser drive circuit is grounded, and the first power supply terminal of the laser drive circuit is also connected to the laser assembly The first input terminal is connected, and the second power supply terminal of the laser drive circuit is connected to the second input terminal of the laser assembly, so that the laser drive circuit does not need to use a preset level with an excessively large amplitude. By reducing the voltage that drives the laser assembly to emit light, Based on the above connection relationship, the laser driving circuit can use the preset level to drive the laser component to emit light or stop emitting light according to the ADIM signal and the PWM signal, thereby realizing the normal operation of the laser component and improving the driving performance of the laser driving circuit , Save the cost of the circuit.

Example three

The third embodiment provides three feasible implementations describing the specific circuit structure of the laser driving circuit 26.

In a feasible implementation manner, on the basis of the first and second embodiments above, as shown in FIG. 5, the laser driving circuit 26 may include: a control circuit 26a, a switch circuit 26b, a charging and discharging circuit 26d, and a current detection circuit 26c.

For ease of description, in FIG. 5, the first input terminal and the second input terminal of the control circuit 26a are identified by the letters "adim" and "pwm" (respectively corresponding to 261 and 262 in FIG. 4). The control terminal of the control circuit 26a is identified by the letter "drv", the input terminal of the switch circuit 26b is identified by the letter "in1", and the first and second output terminals of the switch circuit 26b are identified by the letters "out1" and "out2" For identification, the first power supply terminal and the second power supply terminal of the charging and discharging circuit 26d are identified by the letters "pow1" and "pow2", and the output terminal of the charging and discharging circuit 26d is identified by the letters "out3". The input terminal of the current detection circuit 26c is identified by the letter "in2", the output terminal of the current detection circuit 26c is identified by the letter "out", the detection terminal of the control circuit 26a is identified by the letter "isen", and the current detection circuit 26c is grounded The end is identified by the letters "Gnd".

In the embodiment of the present application, the first input terminal of the control circuit 26a, that is, the first input terminal of the laser driving circuit 26, is used to receive the ADIM signal. The second input terminal of the control circuit 26a, that is, the second input terminal of the laser driving circuit 26, is used to receive the PWM signal.

Wherein, the control circuit 26a may be an integrated chip or a circuit formed by a combination of multiple components. The specific type and quantity of the control circuit 26a are not limited in the embodiment of the present application.

In the embodiment of the present application, the control terminal of the control circuit 26a is connected to the input terminal of the switch circuit 26b to transmit a control signal to the switch circuit 26b, denoted as "DRV signal", to control the switch state of the switch circuit 26b. The first output terminal of the switch circuit 26b is connected to the input terminal of the charging and discharging circuit 26d to control the power supply to the charging and discharging circuit 26d.

In the embodiment of the present application, the first power supply terminal of the charging and discharging circuit 26d, that is, the first power supply terminal of the laser driving circuit 26, is connected to a preset level. The first power supply terminal of the charging and discharging circuit 26d is also connected to the first input terminal of the laser assembly 23 to supply power to the laser assembly 23. The second power supply terminal of the charging and discharging circuit 26d, that is, the second power supply terminal of the laser driving circuit 26, is connected to the second input terminal of the laser assembly 23.

In the embodiment of the present application, the input terminal of the current detection circuit 26c is connected to the second output terminal 26b of the switch circuit 26b, and the ground terminal of the current detection circuit 26c is grounded, so that the current detection circuit 26c can be obtained from the switch circuit 26b The driving current provided to the laser assembly 23 is used to control the current of the laser assembly 23.

The output terminal of the current detection circuit 26c is connected to the detection terminal of the control circuit 26a, so that the current detection circuit 26c can transmit a current detection signal to the control circuit 26a in real time, denoted as "ISEN signal", which can indicate the driving of the laser component 23 Current situation.

Based on the above description, the control circuit 26a can jointly adjust the amplitude and presence of the driving current provided to the laser component 23 according to the ADIM signal, the PWM signal and the ISEN signal, so that the control circuit 26a can transmit the DRV signal to the switch circuit 26b to switch The circuit 26b can be turned on or off according to the DRV signal.

Figure 6 shows a schematic diagram of the waveforms of the ADIM signal, the PWM signal and the ISEN signal. It can be seen from Figure 6 that the PWM signal is a high-frequency signal. One has the frequency range between 18K HZ-300M HZ, and the other has the frequency range between 18K HZ-300M HZ and the duty cycle range is More than 50%. The ADIM signal is a signal whose amplitude changes constantly, and its amplitude is not limited. Under the combined action of the PWM signal and the ADIM signal, the generated DRV signal is also a high-frequency switching signal, and the amplitude of the high-level pulse will also change during each period when the switching circuit 26b is turned on, showing Non-DC characteristics.

Among them, the embodiment of the present application does not limit the specific process of the control circuit 26a generating the DRV signal. Exemplarily, FIG. 7 shows a schematic circuit diagram of the control circuit 26a generating the DRV signal according to the ADIM signal and the PWM signal. As shown in FIG. 7, the control circuit 26a can compare the ADIM signal with the ISEN signal to generate a first comparison signal. The control circuit 26a then passes the comparator again according to the PWM signal and the first comparison signal, thereby generating the DRV signal from the comparison result.

In a specific embodiment, the ADIM signal is compared with the ISEN signal to generate a 240HZ signal, and the PWM signal is superimposed on the 240HZ signal by a comparator inside the control circuit 26a. The resulting DRV signal is shown in Figure 6. The DRV signal is High frequency superimposed waveform.

Further, when the ISEN signal does not satisfy the preset condition, the control circuit 26a can use the above method to transmit the DRV signal that turns on the switch circuit 26b to the switch circuit 26b according to the ADIM signal, the PWM signal and the ISEN signal.

Alternatively, when the ISEN signal satisfies the preset condition, the control circuit 26a can use the aforementioned method to send the DRV signal to the switch circuit 26b to turn off the switch circuit 26b according to the ADIM signal, the PWM signal and the ISEN signal.

Among them, the preset conditions can be set according to the specific conditions of the ISEN signal. Generally, the voltage parameter is easy to detect, so when the ISEN signal is a voltage signal, the preset condition can be set to the rated voltage, which is the maximum charging voltage of the charging and discharging circuit 26d.

In some embodiments, when the switch circuit 26b is turned on, the charging and discharging circuit 26d can be charged through a preset level. Since the charging and discharging circuit 26d cannot charge the laser assembly 23 at this time, the charging and discharging circuit 26d can drive the laser assembly 23 to stop emitting light.

In some embodiments, when the switch circuit 26b is turned off, since the charging and discharging circuit 26d is already charged, based on the connection relationship between the charging and discharging circuit 26d and the laser assembly 23, the charging and discharging circuit 26d can provide the laser assembly 23 The charging is performed, thereby driving the laser assembly 23 to emit light.

Among them, the specific structure of the switch circuit 26b may include multiple types. In some embodiments, FIG. 8 shows a schematic circuit diagram of the switch circuit 26b in the laser driving circuit 26 provided by the present application. As shown in FIG. 8, the switch circuit 26b may include: a first N-type metal-oxide-semiconductor NMOS tube and a first resistor.

For ease of description, in FIG. 8, the first NMOS transistor is identified by the letter "V1", and the first resistor is identified by the letter "R1".

Among them, the first end of the first resistor is connected to the control end of the control circuit 26a, the second end of the first resistor is connected to the gate of the first NMOS transistor, and the drain of the first NMOS transistor is connected to the input end of the charging and discharging circuit 26d. Connected, the source of the first NMOS transistor is connected to the input terminal of the current detection circuit 26c.

In the embodiment of the present application, the first resistor can slow down the resistance Rds between the drain and the source of the first NMOS transistor, so that Rds changes from infinity to the on-resistance Rds(on). In general, Rds(on) is 0.1 ohm or lower. If the gate of the first NMOS tube is not connected to the first resistor, under high voltage conditions, the switching rate of the first NMOS tube is too fast, which may easily lead to breakdown of surrounding components. If the resistance of the first resistor is too large, the switching rate of the first NMOS tube will slow down, and it will take a long time for Rds to go from infinity to Rds(on). Especially under high voltage conditions, Rds will consume a lot of power, leading to the first The NMOS tube generates abnormal heat, which reduces the life of the first NMOS tube.

It should be noted that the embodiment of the present application does not limit the specific number and type of the first NMOS transistor and the first resistor. The switch circuit 26b is not limited to the foregoing implementation, and the embodiment of the present application does not limit this, and it only needs to satisfy that the switch circuit 26b includes components with on and off functions.

Among them, the specific structure of the charge and discharge circuit 26d may include multiple types. Continuing to combine with FIG. 8, in some embodiments, as shown in FIG. 8, the charging and discharging circuit 26 d may include: a first diode and a first inductor.

For ease of description, in FIG. 8, the first diode is identified with the letter "VD1", and the first inductor is identified with the letter "L1".

Wherein, the drain of the first NMOS tube is respectively connected to the anode of the first diode and the first end of the first inductor, the cathode of the first diode is connected with a preset level, and the cathode of the first diode is also It is connected to the first input end of the laser component 23, and the second end of the first inductor is connected to the second input end of the laser component 23.

In the embodiment of the present application, the diode has unidirectional conductivity, and the inductor has an energy storage function. When the switch circuit 26b is turned on, the diode is short-circuited, and the preset level will charge the inductor. During the charging of the inductor, the current detection circuit 26c can detect the current flowing through the inductor, convert the current into an ISEN signal and transmit it to the control circuit 26a.

Further, when the control circuit 26a determines that the ISEN signal does not meet the preset condition, the control circuit 26a can control the switch circuit 26b to maintain the on state, so that the inductor can continue to be charged. When the control circuit 26a determines that the ISEN signal meets the preset condition, the control circuit 26a can control the switch circuit 26b to turn off. Furthermore, when the switch circuit 26b is turned off, the diode is turned on, and the energy stored in the inductor is discharged through the laser component 23 through the diode.

In the embodiment of the present application, the control circuit 26a may determine the time interval between the first detected ISEN signal and the ISEN signal meeting the preset condition as the charging time of the inductor. Since the charging time and discharging time of the inductor are the same, the control circuit 26a can determine the charging time of the inductor as the discharging time of the inductor, so that the control circuit 26a can continue to control the switching circuit 26b to turn on to start the next cycle.

It should be noted that the embodiments of the present application do not limit the specific number and types of diodes and inductors. The charging and discharging circuit 26d is not limited to the foregoing implementation, and the embodiment of the present application does not limit this, and it only needs to satisfy that the charging and discharging circuit 26d includes components with storage functions.

Among them, the specific structure of the current detection circuit 26c may include multiple types. Continuing to combine with FIG. 8, in some embodiments, as shown in FIG. 8, the current detection circuit 26c may include: a second resistor, a third resistor, a fourth resistor, and a capacitor.

For ease of description, in Figure 8, the second resistor is identified by the letter "R2", the third resistor is identified by the letter "R3", the fourth resistor is identified by the letter "R4", and the capacitor is identified by the letter "C".

Wherein, the first end of the second resistor is connected to the gate of the first NMOS transistor, and the second end of the second resistor and the first end of the third resistor are both connected to the source of the first NMOS transistor and the first end of the fourth resistor. Between one end, the second end of the third resistor and the first end of the capacitor are both connected to the current detection end of the control circuit 26a, and the second end of the fourth resistor and the second end of the capacitor are grounded.

In the embodiment of the present application, the second resistor is used as a bleeder resistor, which can discharge a small amount of static electricity between the gate and source of the first NMOS tube, and prevent the first NMOS tube from malfunctioning or even breakdown of the first NMOS tube. It plays a role in protecting the first NMOS tube and also provides a bias voltage for the first NMOS tube. The third resistor and capacitor play the role of filtering. The fourth resistor serves as a component for the current detection circuit 26c to convert the charging current, and can transmit the ISEN signal to the control circuit 26a, playing a feedback role.

It should be noted that the embodiments of the present application do not limit the specific numbers and types of the second resistor, the third resistor, the fourth resistor, and the capacitor. The current detection circuit 26c is not limited to the foregoing implementation manner, and the embodiment of the present application does not limit it, as long as the current detection circuit 26c includes components that convert the charging current of the charging and discharging circuit.

On the basis of the above embodiment in FIG. 5, since there are many high-power components in the laser drive circuit 26, it is easy to consume energy and the cost is high. Therefore, in order to protect the laser drive circuit 26, as shown in FIG. 9, the embodiment of the present application The laser driving circuit 26 may also include a protection circuit 26e. Among them, the feedback end of the control circuit 26a is connected to the input end of the protection circuit 26e, and the output end of the protection circuit 26e is connected to the power supply circuit 20.

For ease of description, in FIG. 9, the feedback terminal of the protection circuit 26e is identified with the letter "rf", the input terminal of the protection circuit 26e is identified with the letter "in3", and the output terminal of the protection circuit 26e is identified with the letter "out4".

In the embodiment of the present application, since the ISEN signal transmitted by the current detection circuit 26c can indicate the working status of the laser drive circuit 26, especially whether the switching circuit 26b has a fault (such as a short circuit) or whether it is working normally, the ISEN signal indicates that the switch When the circuit 26c has a fault, the control circuit 26a can send a fault feedback signal to the protection circuit 26e, which is marked as "RF signal".

Further, when the protection circuit 26e receives the fault RF signal RF, the protection circuit 26e can send a step-down signal to the power supply circuit 20, so that the amplitude of the preset voltage is reduced, so that the charging and discharging circuit 26d cannot be charged, and the laser assembly 23 Then, the light emission is stopped, so that the protection circuit 26e protects the laser drive circuit 26, prolongs the service life of the laser drive circuit 26, and reduces the cost of components.

The specific structure of the protection circuit 26e may include multiple types. For ease of description, the specific structure of the protection circuit 26e will be described in detail with reference to FIG. 10. In some embodiments, as shown in FIG. 10, the protection circuit 26e may include a fifth resistor, a sixth resistor, a PNP transistor, a photocoupler, a Zener diode, and a seventh resistor.

For ease of description, in Figure 10, the fifth resistor is identified with the letter "R5", the sixth resistor is identified with the letter "R6", the PNP transistor is identified with the letter "Q2", and the photocoupler is identified with the letter "N1". Marking, the Zener diode is marked with the letter "V2", and the seventh resistor is marked with the letter "R7".

In the embodiment of the present application, the first end of the fifth resistor is connected to the feedback end of the control circuit 26a, and the second end of the fifth resistor is connected to the first end of the sixth resistor and the base of the PNP type triode, respectively. The collector of the PNP transistor is connected to the second end of the sixth resistor, the first end of the photocoupler is connected to the supply voltage, and the second end of the photocoupler is connected to the second end of the sixth resistor, The fourth end of the photocoupler is connected to the cathode of the Zener diode and the first end of the seventh resistor, the second end of the seventh resistor is connected to the power circuit, and the anode of the Zener diode and the third end of the photocoupler are grounded. .

In the embodiment of this application, the RF signal can be transmitted to the second end of the photocoupler via the fifth resistor, the sixth resistor and the PNP transistor, so that the photocoupler can change the initial state of the photocoupler (for example, the photocoupler can never Light-emitting to light-emitting transition), in this way, the signal on the fourth terminal of the photocoupler can transmit the step-down signal to the power circuit through the Zener diode and the seventh resistor, so that the power circuit reduces the amplitude of the preset level. Therefore, even if the control circuit 26a turns on the switch circuit 26b, the charging and discharging circuit 26d cannot be charged, which effectively protects the laser drive circuit 26.

It should be noted that the embodiments of the present application do not limit the specific numbers and types of the fifth resistor, the sixth resistor, the PNP transistor, the photocoupler, the Zener diode, and the seventh resistor. The protection circuit 26e is not limited to the foregoing implementation manner, and the embodiment of the present application does not limit this, as long as the protection circuit 26e includes components that convert the charging current of the charge and discharge circuit 26d.

In another feasible implementation manner, on the basis of the first embodiment above, the laser driving circuit 26 can adopt a boost topology to switch the light-emitting state of the laser component 23 at high frequency.

Next, in conjunction with FIG. 11, the boost topology of the laser driving circuit 26 will be described in detail.

As shown in FIG. 11, the laser driving circuit 26 may include: a first controller, a second inductor, a second NMOS tube, a second diode, and a second capacitor.

For ease of description, in Figure 11, the second inductor is identified by the letter "L2", the second NMOS transistor is identified by the letter "Q3", the second diode is identified by the letter "V3", and the second capacitor is identified by the letter " C2" for identification.

The first end of the second inductor is connected to the control end of the first controller, the second end of the second inductor is connected to the gate of the second NMOS transistor, and the drain of the second NMOS transistor is connected to the second diode. The anode of the second diode is connected to the first input terminal of the laser component 23 and the first terminal of the second capacitor, and the source of the second NMOS tube is connected to the second input terminal and the second terminal of the laser component 23 respectively. The second end of the capacitor is connected.

It is worth noting that the foregoing only provides an example of the laser driving circuit 26 with a boost topology. On this basis, any existing boost topology can be used for expansion.

In another feasible implementation manner, based on the above-mentioned embodiment 1, the laser driving circuit 26 may also adopt a buck topology to switch the light-emitting state of the laser component 23 at high frequency.

Hereinafter, the step-down topology of the laser driving circuit 26 will be described in detail with reference to FIG. 12.

As shown in FIG. 12, the laser driving circuit 26 may include: a second controller, a third inductor, a third NMOS tube, a third capacitor, and a third diode.

For ease of description, in Figure 12, the third inductor is identified with the letter "L3", the third NMOS transistor is identified with the letter "Q4", the third diode is identified with the letter "V4", and the third capacitor is identified with the letter " C3" for identification.

Wherein, the gate of the third NMOS tube is connected to the control terminal of the second controller, the drain of the third NMOS tube is connected to the first terminal of the third inductor, and the cathode of the third diode is connected to the drain of the NMOS tube and The first end of the third inductor is in between, the second end of the third inductor is connected to the first input end of the laser component 23 and the first end of the third capacitor respectively, and the anode of the third diode is connected to the third NMOS The source of the tube and the second end of the third capacitor are connected, and the second end of the third capacitor is also connected to the second input end of the laser component 23.

It is worth noting that the foregoing only provides an example of the laser drive circuit 26 with a buck topology. On this basis, any existing buck topology can be used for expansion.

It should be noted that the first controller shown in FIG. 11 and the second controller shown in FIG. 12 may adopt an integrated chip, or may be an integrated circuit formed by a combination of multiple components. The specific type and data of the second controller are not limited.

Example four

On the basis of the above-mentioned first embodiment, second embodiment or third embodiment, any laser driving circuit 26 can be used to drive lasers of any color. As can be seen in conjunction with Figure 2, the DMD drive circuit 21 can include multiple groups of ports for outputting ADIM signals and PWM signals, and based on the connection between the DMD drive circuit 21 and each laser drive circuit 26, the DMD drive circuit 21 can combine each group The ADIM signal and the PWM signal are input to the corresponding laser driving circuit 26.

As shown in FIG. 13, taking a three-color laser as an example, the laser in the laser assembly 23 may specifically include a red laser 231, a blue laser 232 and a green laser 233. Correspondingly, a laser driving circuit 26 is connected to a red laser 231 to control the light-emitting state of the red laser 231. A laser driving circuit 26' is connected to a blue laser 232 to control the light-emitting state of the blue laser 232. A laser driving circuit 26" is connected to a green laser 233 to control the state of the green laser 233 emitting light.

The DMD drive circuit 21 and the power supply circuit 20 are respectively connected to a laser drive circuit 26, a laser drive circuit 26', and a laser drive circuit 26". The DMD drive circuit 21 can be controlled by the TV SOC circuit 22 (not shown in Figure 13). Out), the TV SOC circuit 22 can determine what set of ADIM signals and PWM signals are output by the DMD drive circuit 21 to a laser drive circuit 26, a laser drive circuit 26', and a laser drive circuit 26" at what time.

Among them, any one of a laser drive circuit 26, a laser drive circuit 26', and a laser drive circuit 26" can refer to the description in the above-mentioned embodiment 1, embodiment 2 or embodiment 3. To expand in detail. ADIM signal and PWM signal can also refer to the related introduction of Figure 6.

Example five

FIG. 14 is a flowchart of a laser driving method provided by this application. As shown in FIG. 14, the laser driving method according to the embodiment of the present application is applied to any laser driving circuit shown in the first embodiment, the second embodiment, or the third embodiment, or any laser display device shown in the foregoing embodiment, It can be implemented by the processing unit in any of the above-mentioned laser driving circuits through software and/or hardware. As shown in FIG. 14, the laser driving method of the embodiment of the present application may include:

S101. Receive analog dimming signal and high-frequency pulse dimming signal. The analog dimming signal is used to adjust the amplitude of the laser component current, and the high-frequency pulse dimming signal is used to control the current of the laser component. High-frequency pulse dimming The frequency range of the signal is between 18KHZ-300MHZ and the duty cycle range of the high-frequency pulse dimming signal is greater than 50%, or the frequency range of the high-frequency pulse dimming signal is between 18KHZ-300MHZ.

S102: According to the analog dimming signal and the high-frequency pulse dimming signal, drive the laser assembly to emit light or stop emitting light.

The laser driving method provided by the embodiment of the present application may use the processing unit in the above-mentioned laser driving circuit to execute the process, and its implementation manner and technical effect are similar, and the description of the embodiment of the present application will not be repeated here.

In some embodiments, FIG. 15 shows a specific implementation manner of driving the laser assembly to emit light or stop emitting light according to the analog dimming signal and the high-frequency pulse dimming signal in S102. As shown in FIG. 15, the laser driving method of the embodiment of the present application may include:

S201: Obtain a current detection signal according to the acquired driving current provided by the laser driving circuit to the laser component.

S202: Determine whether the current detection signal meets a preset condition. If yes, execute S203; if not, execute S204.

S203: Drive the laser assembly to emit light according to the analog dimming signal, the high-frequency pulse dimming signal and the current detection signal.

S204. Drive the laser assembly to stop emitting light according to the analog dimming signal, the high-frequency pulse dimming signal and the current detection signal.

The laser driving method provided by the embodiment of the present application may use the processing unit in the above-mentioned laser driving circuit to execute the process, and its implementation manner and technical effect are similar, and the description of the embodiment of the present application will not be repeated here.

FIG. 16 is a schematic diagram of the hardware structure of the electronic device provided by this application. As shown in FIG. 16, the electronic device 100 is configured to implement operations corresponding to the laser driving circuit in any of the foregoing method embodiments. The electronic device 100 in the embodiment of the present application may include: a memory 101 and a processor 102;

The memory 101 is used to store computer programs;

The processor 102 is configured to execute a computer program stored in the memory to implement the laser driving method in the foregoing embodiment. For details, refer to the related description in the foregoing method embodiment.

In some embodiments, the memory 101 may be independent or integrated with the processor 102.

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

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

In some implementation manners, the embodiments of the present application may further include: a communication interface 104, and the communication interface 104 may be connected to the processor 102 through the bus 103. The processor 102 can control the communication interface 103 to implement the above-mentioned receiving and sending functions of the electronic device 100.

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

In the several embodiments provided in this application, it should be understood that the disclosed device and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods, for example, multiple modules can be combined or integrated into another. A system or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or modules, and may be in electrical, mechanical or other forms.

The modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.

In addition, the functional modules in the various embodiments of the present application may be integrated into one processing unit, or each module may exist alone physically, or two or more modules may be integrated into one unit. The units formed by the above-mentioned modules can be realized in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated modules implemented in the form of software function modules may be stored in a computer readable storage medium. The above-mentioned software function module is stored in a storage medium, and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) execute the method of each embodiment of the present application Part of the steps.

It should be understood that the foregoing processor may be a central processing unit (English: Central Processing Unit, abbreviated: CPU), or other general-purpose processors, digital signal processors (English: Digital Signal Processor, abbreviated: DSP), and application-specific integrated circuits (English: Application Specific Integrated Circuit, referred to as ASIC) etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in combination with the invention can be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

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

The bus can be an Industry Standard Architecture (ISA) bus, Peripheral Component (PCI) bus, or Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, the buses in the drawings of this application are not limited to only one bus or one type of bus.

The above-mentioned computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or their combination, 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-purpose or special-purpose computer.

A person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps including the foregoing method embodiments are executed; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the application range.

Claims (21)

1. A laser driving circuit, including:

   The first input terminal is configured to receive an analog dimming signal for adjusting the amplitude of the current of the laser assembly;

   The second input terminal is configured to receive a high-frequency pulse dimming signal, the high-frequency pulse dimming signal is used to control the presence or absence of the current of the laser assembly, and the frequency range of the high-frequency pulse dimming signal is 18K HZ- Between 300M Hz and the duty cycle range of the high-frequency pulse dimming signal is greater than 50%, or the frequency range of the high-frequency pulse dimming signal is between 18KHZ-300MHZ;

   The laser driving circuit is used to drive the laser assembly to emit light or stop emitting light according to the analog dimming signal and the high-frequency pulse dimming signal.
2. The circuit of claim 1, comprising:

   The first power supply terminal of the laser drive circuit is connected to a power supply circuit, the power supply circuit is used to provide a preset level, and the first power supply terminal of the laser drive circuit is also connected to the first input terminal of the laser assembly, The second power supply terminal of the laser drive circuit is connected to the second input terminal of the laser assembly, and the ground terminal of the laser drive circuit is grounded.
3. The circuit according to claim 1 or 2, the laser driving circuit comprising: a control circuit, a switch circuit, a charging and discharging circuit, and a current detection circuit;

   Wherein, the first input terminal of the control circuit is used to receive the analog dimming signal, the second input terminal of the control circuit is used to receive the high-frequency pulse dimming signal, and the control terminal of the control circuit is connected to The input terminal of the switch circuit is connected,

   The first output terminal of the switch circuit is connected to the input terminal of the charge and discharge circuit, the first power supply terminal of the charge and discharge circuit is connected with a preset level, and the first power supply terminal of the charge and discharge circuit is also connected to the The first input terminal of the laser component is connected, and the second power supply terminal of the charge and discharge circuit is connected to the second input terminal of the laser component;

   The input terminal of the current detection circuit is connected to the second output terminal of the switch circuit, the output terminal of the current detection circuit is connected to the detection terminal of the control circuit, and the ground terminal of the current detection circuit is grounded;

   The current detection circuit is configured to transmit a current detection signal to the control circuit according to the acquired drive current provided by the switch circuit to the laser assembly;

   The control circuit is used to transmit a control signal to the switch circuit according to the analog dimming signal, the high-frequency pulse dimming signal and the current detection signal, and the control signal is used to turn on or turn off The switch circuit;

   The charging and discharging circuit is used to charge at the preset level when the switch circuit is turned on to drive the laser component to stop emitting light; when the switch circuit is turned off, to the laser component Charging to drive the laser assembly to emit light.
4. The circuit according to claim 3,

   The control circuit is specifically configured to transmit to the switch circuit according to the analog dimming signal, the high-frequency pulse dimming signal, and the current detection signal when the current detection signal does not meet a preset condition A control signal that turns on the switch circuit.
5. The circuit according to claim 3,

   The control circuit is specifically configured to send off to the switch circuit based on the analog dimming signal, the high-frequency pulse dimming signal, and the current detection signal when the current detection signal meets a preset condition. Turn off the control signal of the switch circuit.
6. The circuit according to any one of claims 3-5, the switch circuit comprising: an N-type metal-oxide-semiconductor NMOS tube and a first resistor;

   Wherein, the first end of the first resistor is connected to the control end of the control circuit, the second end of the first resistor is connected to the gate of the NMOS tube, and the drain of the NMOS tube is connected to the The input end of the charge and discharge circuit is connected, and the source of the NMOS tube is connected to the input end of the current detection circuit.
7. The circuit according to claim 6, wherein the charging and discharging circuit comprises: a diode and an inductor;

   Wherein, the drain of the NMOS tube is respectively connected to the anode of the diode and the first end of the inductor, the cathode of the diode is connected to the preset level, and the cathode of the diode is also connected to the laser The first input end of the component is connected, and the second end of the inductor is connected to the second input end of the laser component.
8. The circuit according to claim 6 or 7, the current detection circuit comprising: a second resistor, a third resistor, a fourth resistor and a capacitor;

   Wherein, the first end of the second resistor is connected to the gate of the NMOS transistor, and the second end of the second resistor and the first end of the third resistor are both connected to the source and the NMOS transistor. Between the first end of the fourth resistor, the second end of the third resistor and the first end of the capacitor are both connected to the current detection end of the control circuit, and the second end of the fourth resistor is connected to The second end of the capacitor is grounded.
9. 8. The circuit according to any one of claims 3-8, the laser driving circuit further comprising: a protection circuit;

   Wherein, the feedback terminal of the control circuit is connected with the input terminal of the protection circuit, and the output terminal of the protection unit is connected with the power circuit;

   The control circuit is configured to send a fault feedback signal to the protection circuit when the current detection signal indicates that the switch circuit has a fault;

   The protection circuit is configured to send a step-down signal to the power supply circuit according to the fault feedback signal, and the step-down signal is used to reduce the amplitude of the preset level so that the laser assembly stops emitting light .
10. A laser driving circuit, including:

    The first input terminal is configured to receive an analog dimming signal for adjusting the amplitude of the current of the laser assembly;

    The second input terminal is configured to receive a high-frequency pulse dimming signal, and the high-frequency pulse dimming signal is used to control the presence or absence of current of the laser assembly;

    The first power supply terminal is connected to a power supply circuit for providing a preset level, and is also connected to the first input terminal of the laser assembly;

    The second power supply terminal is connected to the second input terminal of the laser assembly;

    Ground terminal, configured as ground;

    The laser driving circuit is used to drive the laser assembly to emit light or stop emitting light according to the analog dimming signal and the high-frequency pulse dimming signal.
11. The circuit according to claim 10, the laser driving circuit comprising: a control circuit, a switch circuit, a charging and discharging circuit, and a current detection circuit;

    Wherein, the first input terminal of the control circuit is used to receive the analog dimming signal, the second input terminal of the control circuit is used to receive the high-frequency pulse dimming signal, and the control terminal of the control circuit is connected to The input terminal of the switch circuit is connected,

    The first output terminal of the switch circuit is connected to the input terminal of the charge and discharge circuit, the first power supply terminal of the charge and discharge circuit is connected with a preset level, and the first power supply terminal of the charge and discharge circuit is also connected to the The first input terminal of the laser component is connected, and the second power supply terminal of the charge and discharge circuit is connected to the second input terminal of the laser component;

    The input terminal of the current detection circuit is connected to the second output terminal of the switch circuit, the output terminal of the current detection circuit is connected to the detection terminal of the control circuit, and the ground terminal of the current detection circuit is grounded;

    The current detection circuit is configured to transmit a current detection signal to the control circuit according to the acquired drive current provided by the switch circuit to the laser assembly;

    The control circuit is used to transmit a control signal to the switch circuit according to the analog dimming signal, the high-frequency pulse dimming signal and the current detection signal, and the control signal is used to turn on or turn off The switch circuit;

    The charging and discharging circuit is used to charge at the preset level when the switch circuit is turned on to drive the laser component to stop emitting light; when the switch circuit is turned off, to the laser component Charging to drive the laser assembly to emit light.
12. The circuit according to claim 11,

    The control circuit is specifically configured to transmit to the switch circuit according to the analog dimming signal, the high-frequency pulse dimming signal, and the current detection signal when the current detection signal does not meet a preset condition A control signal that turns on the switch circuit.
13. The circuit according to claim 11,

    The control circuit is specifically configured to send off to the switch circuit based on the analog dimming signal, the high-frequency pulse dimming signal, and the current detection signal when the current detection signal meets a preset condition. Turn off the control signal of the switch circuit.
14. The circuit according to any one of claims 11-13, the switch circuit comprising: an N-type metal-oxide-semiconductor NMOS tube and a first resistor;

    Wherein, the first end of the first resistor is connected to the control end of the control circuit, the second end of the first resistor is connected to the gate of the NMOS tube, and the drain of the NMOS tube is connected to the The input end of the charge and discharge circuit is connected, and the source of the NMOS tube is connected to the input end of the current detection circuit.
15. The circuit according to claim 14, wherein the charging and discharging circuit comprises: a diode and an inductor;

    Wherein, the drain of the NMOS tube is respectively connected to the anode of the diode and the first end of the inductor, the cathode of the diode is connected to the preset level, and the cathode of the diode is also connected to the laser The first input end of the component is connected, and the second end of the inductor is connected to the second input end of the laser component.
16. The circuit according to claim 14 or 15, the current detection circuit comprising: a second resistor, a third resistor, a fourth resistor and a capacitor;

    Wherein, the first end of the second resistor is connected to the gate of the NMOS transistor, and the second end of the second resistor and the first end of the third resistor are both connected to the source and the NMOS transistor. Between the first end of the fourth resistor, the second end of the third resistor and the first end of the capacitor are both connected to the current detection end of the control circuit, and the second end of the fourth resistor is connected to The second end of the capacitor is grounded.
17. The circuit according to any one of claims 11-16, the laser driving circuit further comprising: a protection circuit;

    Wherein, the feedback terminal of the control circuit is connected with the input terminal of the protection circuit, and the output terminal of the protection unit is connected with the power circuit;

    The control circuit is configured to send a fault feedback signal to the protection circuit when the current detection signal indicates that the switch circuit has a fault;

    The protection circuit is configured to send a step-down signal to the power supply circuit according to the fault feedback signal, and the step-down signal is used to reduce the amplitude of the preset level so that the laser assembly stops emitting light .
18. A laser display device, comprising: a power supply circuit, a digital micromirror device DMD drive circuit, a video system-level chip TV SOC, a laser assembly, an optical processor, a DMD, a lens, and M according to any one of claims 1-9 The laser driving circuit, or M laser driving circuits according to any one of claims 11-17, M is a positive integer;

    Wherein, the power supply circuit is respectively connected to the power supply terminal of the TV SOC and the power supply terminal of each laser drive circuit, the output terminal of the TV SOC is connected to the input terminal of the DMD drive circuit, and the DMD drive circuit The first output terminal is connected to the first input terminal of each laser drive circuit, the second output terminal of the DMD drive circuit is connected to the second input terminal of each laser drive circuit, and the third output terminal of the DMD drive circuit Connected with the input terminal of the DMD, and the output terminal of each laser drive circuit is connected with the input terminal of the laser assembly;

    The power supply circuit is used to supply power to the TV SOC and each laser driving circuit, and to provide a preset level to each laser driving circuit;

    The TV SOC is used to provide a video signal to the DMD driving circuit;

    The DMD driving circuit is configured to provide the video signal to the DMD to invert the DMD, and send an analog dimming signal and a high-frequency pulse dimming signal to each laser driving circuit according to the video signal ；

    Each laser driving circuit is used to drive the laser assembly to emit light according to the analog dimming signal and the high-frequency pulse dimming signal, and the light is collected by the optical processor and then irradiated on the DMD to make The DMD is projected on the projection device through the lens.
19. The device of claim 18, comprising:

    The types of lasers in the laser assembly include: red lasers and blue lasers, or red lasers, blue lasers, and green lasers.
20. A laser driving method applied to a laser driving circuit, the method including:

    Receive an analog dimming signal and a high-frequency pulse dimming signal, the analog dimming signal is used to adjust the amplitude of the laser assembly current, and the high-frequency pulse dimming signal is used to control the presence or absence of the laser assembly current, so The frequency range of the high-frequency pulse dimming signal is between 18KHZ-300MHZ, or the frequency range of the high-frequency pulse dimming signal is between 18KHZ-300MHZ and the frequency of the high-frequency pulse dimming signal The duty cycle range is greater than 50%;

    According to the analog dimming signal and the high-frequency pulse dimming signal, the laser assembly is driven to emit light or stops emitting light.
21. The method according to claim 20, wherein the driving or stopping the light emission of the laser assembly according to the analog dimming signal and the high-frequency pulse dimming signal comprises:

    Obtaining a current detection signal according to the obtained driving current provided by the laser driving circuit to the laser component;

    When the current detection signal meets a preset condition, driving the laser assembly to emit light according to the analog dimming signal, the high-frequency pulse dimming signal, and the current detection signal;

    When the current detection signal does not satisfy a preset condition, the laser assembly is driven to stop emitting light according to the analog dimming signal, the high-frequency pulse dimming signal, and the current detection signal.

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