Laser projection equipment

Abstract

The embodiment of the invention belongs to the projection display technology, and provides laser projection equipment. The laser projection equipment comprises a display control assembly, a laser driving assembly and a laser assembly, the laser assembly comprises a plurality of lasers and a plurality of switch assemblies, the lasers are common cathode lasers or common anode lasers, the lasers are connected in series, and every two lasers connected in series are connected through the corresponding switch assembly. The laser driving assembly comprises a plurality of constant current assemblies, the plurality of constant current assemblies are connected with the laser assembly, and the display control assembly is respectively connected with the plurality of constant current assemblies and the plurality of switch assemblies. According to the scheme, series connection of the lasers is realized by arranging the switch assembly between the lasers, so that currents flowing through the lasers are consistent, and the brightness of a displayed picture is higher; and the number of chips can be effectively reduced, the cost is reduced, and miniaturization is facilitated.

Description

Technical Field

[0001] The embodiments of the present application relate to projection display technology, and more specifically, to a laser projection device. Background Art

[0002] With the development of science and technology and the improvement of people's living standards, various types of projection equipment have emerged. Among them, laser projection equipment is deeply loved by people for its eye protection, bright colors, and power saving. In order to reduce the space occupied by laser projection equipment, the size of laser projection equipment is getting smaller and smaller, and the lasers therein are also miniaturized. One direction of miniaturization is to use a common cathode laser or a common anode laser. For example, Figure 1 The circuit diagram of the common cathode laser provided in this application is as follows: Figure 2 The circuit diagram of the common anode laser provided in this application is as follows: Figure 1 As shown, in a common cathode laser, the lasers share a cathode pin, such as Figure 2 As shown, in a common anode laser, the lasers share one anode pin.

[0003] In the prior art, in order to improve the projection brightness of laser projection equipment, multiple lasers are usually used. As for the connection method of multiple lasers, since the pins in the common cathode laser and the common anode laser are shared, it is difficult to connect them in series, and a parallel method is generally adopted; in addition, each sub-laser corresponding to each luminous color in each common cathode laser or common anode laser needs to be equipped with a control chip.

[0004] However, connecting common cathode lasers or common anode lasers in parallel will cause inconsistent currents flowing through multiple common cathode lasers or common anode lasers, which in turn will cause inconsistent brightness of the displayed image. It will also lead to the use of a large number of chips, high costs, difficulty in miniaturization, and greater common magnetic interference. Summary of the invention

[0005] An embodiment of the present application provides a laser projection device, which is used to solve the problems that common cathode lasers or common anode lasers in existing laser projection devices are connected in parallel, resulting in inconsistent currents flowing through multiple common cathode lasers or common anode lasers, which in turn leads to inconsistent brightness of the displayed image, and also leads to a large number of chips used, high cost, being unfavorable for miniaturization, and generating large common magnetic interference.

[0006] In a first aspect, an embodiment of the present application provides a laser projection device, including: a display control component, a laser driving component, and a laser component;

[0007] The laser driving component includes a plurality of constant current components, and the plurality of constant current components are connected to the laser component;

[0008] The display control component is connected to the multiple constant current components respectively, and is used to output a pulse width modulation signal and an enable signal to the multiple constant current components;

[0009] The multiple constant current components are used to drive the laser component to emit light according to the pulse width modulation signal when the received enable signal is a valid potential;

[0010] The laser assembly includes a plurality of lasers and a plurality of switch assemblies, wherein the plurality of lasers are common cathode lasers or common anode lasers, and the plurality of lasers are connected via the plurality of switch assemblies;

[0011] The display control component is respectively connected to the plurality of switch components, and is used to output an enable signal to the plurality of switch components;

[0012] The plurality of switch components are used to turn on the plurality of lasers when the received enable signal is the effective potential.

[0013] The beneficial effects of this embodiment are as follows: the laser component includes multiple lasers and multiple switch components, the lasers are common cathode lasers or common anode lasers, and the two lasers are connected by the switch component, which can realize the series connection of common cathode lasers or common anode lasers, so that the currents of multiple common cathode lasers or common anode lasers are consistent, and thus the brightness of the displayed picture is consistent; using multiple lasers makes the brightness of the displayed picture higher; in addition, it can also effectively reduce the number of chips, reduce costs, facilitate miniaturization, and reduce the generated common magnetic interference.

[0014] In some embodiments of the present application, the multiple lasers are common cathode lasers;

[0015] For the first laser and the second laser in the two lasers connected in series, the anode of the sub-laser in the second laser is respectively connected to the first end of the corresponding switch component;

[0016] The second end of the switch component connected to the second laser is connected to the common cathode of the first laser.

[0017] Beneficial effects of this embodiment: By setting a switch component between two common cathode lasers, the sub-lasers corresponding to the same color between the common cathode lasers can be connected in series, so that the current flowing through the sub-lasers is consistent and the brightness of the displayed image is consistent.

[0018] In some embodiments of the present application, the multiple lasers are common anode lasers;

[0019] For the third laser and the fourth laser in the two lasers connected in series, the cathodes of the sub-lasers in the third laser are respectively connected to the first ends of the corresponding switch components;

[0020] The second end of the switch component connected to the third laser is connected to the common anode of the fourth laser.

[0021] Beneficial effects of this embodiment: By setting a switch component between two common anode lasers, the sub-lasers corresponding to the same color between the common anode lasers can be connected in series, so that the current flowing through the sub-lasers is consistent and the brightness of the displayed image is consistent.

[0022] In some embodiments of the present application, the constant current component includes a constant current chip, a voltage regulating component and a sampling resistor;

[0023] The display control components are respectively connected to the constant current chips in the multiple constant current components, and are used to output pulse width modulation signals and enable signals to the constant current chips in the multiple constant current components;

[0024] The constant current chip in the constant current component is connected to the voltage regulating component, the constant current chip and the voltage regulating component are connected to one end of the sampling resistor in the constant current component, the other end of the sampling resistor is grounded, and the voltage regulating component is connected to the laser component;

[0025] The constant current chip is used to output a control signal and a loading voltage to the voltage regulating component according to the voltage of the received pulse width modulation signal and the sampling current obtained through the sampling resistor when the received enable signal is the effective potential; the voltage regulating component is used to load a driving voltage to the laser component according to the received control signal to drive each laser in the laser component to emit light.

[0026] The beneficial effects of this embodiment are as follows: through the constant current chip and the voltage regulating component, the current value flowing into multiple lasers can be accurately controlled, and the current can also be kept stable to ensure the safe operation of the laser projection equipment.

[0027] In some embodiments of the present application, each voltage regulating component is a Buck circuit.

[0028] Beneficial effect of this embodiment: Through the Buck circuit, the high voltage output by the constant current chip can be converted into a low voltage.

[0029] In some embodiments of the present application, each voltage regulating component is a Boost circuit.

[0030] Beneficial effect of this embodiment: Through the Boost circuit, the low voltage output by the constant current chip can be converted into a high voltage.

[0031] In some embodiments of the present application, each voltage regulating component is a Buck-Boost circuit.

[0032] Beneficial effect of this embodiment: Through the Buck-Boost circuit, the voltage output by the constant current chip can be adjusted.

[0033] In some embodiments of the present application, each switch component is a transistor.

[0034] The beneficial effects of this embodiment are as follows: using a transistor as a switch component can effectively save costs, and the transistor is more resistant to high voltage.

[0035] In some embodiments of the present application, each switch component is a metal-oxide semiconductor field effect transistor (MOS).

[0036] The beneficial effects of this embodiment are as follows: using a practical MOS tube as a switch component can save energy consumption and reduce noise.

[0037] In a second aspect, an embodiment of the present application provides a laser projection device, including: a display control component, a laser driving component, and a laser component;

[0038] The laser driving component includes a plurality of constant current components, and the plurality of constant current components are connected to the laser component;

[0039] The display control component is connected to the multiple constant current components respectively, and is used to output a pulse width modulation signal and an enable signal to the multiple constant current components;

[0040] The laser assembly includes a plurality of lasers and a plurality of switch assemblies, wherein the plurality of lasers are common cathode lasers or common anode lasers, and the plurality of lasers are connected via the plurality of switch assemblies;

[0041] The display control component is connected to the plurality of switch components respectively, and is used to output an enable signal to the plurality of switch components;

[0042] The display control component acquires the laser working period, the target switch component among the multiple switch components, and the target constant current component among the multiple constant current components;

[0043] During the laser operation period, controlling the enable signal output to the target switch component and the target constant current component to be an effective potential;

[0044] When the received enable signal is at a valid potential, the target switch tube turns on two lasers connected to the target switch tube;

[0045] When the enable signal received by the target constant current component is the effective potential, the drive voltage is loaded to the laser component according to the pulse width modulation signal, and the current is output to the laser component. The current flows through each laser in the laser component and the target switch component and then flows back to the target constant current component, and each laser emits light.

[0046] The beneficial effects of this embodiment are as follows: the laser component includes multiple lasers and multiple switch components, the lasers are common cathode lasers or common anode lasers, and the two lasers are connected by the switch component, which can realize the series connection of common cathode lasers or common anode lasers, so that the currents of multiple common cathode lasers or common anode lasers are consistent, and thus the brightness of the displayed picture is consistent; using multiple lasers makes the brightness of the displayed picture higher; it can also effectively reduce the number of chips, reduce costs, facilitate miniaturization, and reduce the common magnetic interference generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] Figure 1 A circuit diagram of a common cathode laser provided in this application;

[0049] Figure 2 A circuit diagram of a common anode laser provided for this application;

[0050] Figure 3 A circuit diagram of a common laser provided for this application;

[0051] Figure 4 A schematic diagram of the structure of the common anode lasers in parallel in the prior art provided in this application;

[0052] Figure 5 A schematic diagram of a laser projection device provided for this application;

[0053] Figure 6 A schematic diagram of a circuit architecture of a laser projection device according to an embodiment of the present application;

[0054] Figure 7a The structure of the laser projection device provided in this application is shown in FIG. Figure 1 ;

[0055] Figure 7b Timing diagram of the enable signal, PWM signal, and current provided in this application;

[0056] Figure 8 The structure of the laser projection device provided in this application is shown in FIG. Figure 2 ;

[0057] Fig. 9 Schematic diagram of the structure of the laser projection equipment provided for the application Figure 3 ;

[0058] Fig.10 The structure of the laser projection device provided in this application is shown in FIG. Figure 4 ;

[0059] Fig.11 A schematic diagram of the structure of multiple common cathode three-color lasers connected in series provided by the present application;

[0060] Fig.12 A schematic diagram of the structure of multiple common anode three-color lasers connected in series provided by the present application;

[0061] Fig.13 The structure of the laser projection device provided in this application is shown in FIG. Figure 5 ;

[0062] Fig.14 Schematic diagram of the local circuit structure for driving the red sub-laser provided in this application Figure 1 ;

[0063] Fig.15 Schematic diagram of the local circuit structure for driving the red sub-laser provided in this application Figure 2 ;

[0064] Fig.16 Schematic diagram of the local circuit structure for driving the red sub-laser provided in this application Figure 3 ;

[0065] Fig.17 This is a flow chart of the laser control method provided in this application. DETAILED DESCRIPTION

[0066] 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.

[0067] 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.

[0068] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, for example, they can be implemented in an order other than those given in the diagrams or descriptions of the embodiments of this application.

[0069] 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.

[0070] With the development of science and technology, people have more choices for viewing equipment. Laser projection equipment is deeply loved by people for its eye protection, bright colors, and power saving.

[0071] In order to reduce the space occupied by laser projection equipment, the size of laser projection equipment is getting smaller and smaller, and the lasers therein are also miniaturized. One direction of miniaturization is to replace ordinary lasers with common cathode lasers or common anode lasers. For example, Figure 3 The circuit diagram of the common laser provided for this application is as follows: Figure 3 As shown, the pins of the sub-lasers in a common laser are independent of each other. Figure 1 The circuit diagram of the common cathode laser provided in this application is as follows: Figure 2 The circuit diagram of the common anode laser provided in this application is as follows: Figure 1 As shown, in a common cathode laser, the lasers share a cathode pin, such as Figure 2 As shown, the lasers in the common anode laser share one anode pin, so the common cathode laser or common anode laser can save pin space and achieve miniaturization of the laser.

[0072] In the prior art, in order to improve the projection brightness of laser projection equipment, multiple lasers are usually used. As for the connection method of multiple lasers, since the pins in the common cathode laser and the common anode laser are shared, it is difficult to connect them in series, and a parallel method is generally adopted; in addition, each sub-laser corresponding to each luminous color in each common cathode laser or common anode laser needs to be equipped with a control chip.

[0073] For example, Figure 4 The schematic diagram of the structure of the common anode laser in parallel in the prior art provided by this application is as follows: Figure 4As shown, the structure of the common anode laser in parallel in the prior art includes a power supply, a display control component, six constant current components and two common anode lasers. The power supply supplies power to the display control component and the constant current component. The display control component controls the constant current component to output current to the common anode laser, so that the common anode laser lights up. The red sub-laser, the green sub-laser, and the blue sub-laser in the two common anode lasers are output by separate constant current units respectively, so when the lasers of the same luminous color light up at the same time, there will be differences in the current flowing through them, which will cause differences in the brightness of the display screen. In addition, since each sub-laser is equipped with a constant current component, the number of constant current components is large, the cost is high, it is not conducive to miniaturization, and the common magnetic interference generated is large.

[0074] In order to solve the above problems, the technical solution of the present application is described in detail below through specific embodiments. It should be noted that 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.

[0075] The overall structure of the laser projection device is described below, for example, Figure 5 A schematic diagram of a laser projection device provided for this application, such as Figure 5 As 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 501, an optical machine 502, and a lens 503, wherein the light source 501 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 501 may be a plurality of common cathode two-color lasers or a plurality of common anode two-color lasers, such as a blue laser and a red laser, or may be a plurality of common cathode three-color lasers or a plurality of common anode three-color lasers, including lasers of three luminous colors of red, green, and blue, for providing a three-color laser illumination beam.

[0076] The laser beam provided by the light source 501 is incident on the illumination optical path in the optical machine 502 after light combining and shaping. The optical modulator 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, thereby reflecting the light beam irradiating its surface into the lens 503.

[0077] The lens 503 may be an ultra-short-throw projection lens, and the ultra-short-throw projection lens 503 is used to project the image beam onto the projection screen, thereby realizing the projection image display. The laser projection device in the above example may be an ultra-short-throw laser projection device.

[0078] Based on the above Figure 5 Example laser projection device structure, Figure 6 A schematic diagram of the circuit architecture of a laser projection device according to an embodiment of the present application.

[0079] like Figure 6 As shown, the laser projection device includes: a display panel 001, a power panel 002, and a TV panel 003. The power panel 02 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. The TV panel 003 is mainly used to decode external audio and video signals and output video image signals to the display panel 001.

[0080] The display panel 001 may be provided with a field programmable gate array (FPGA) and an algorithm processing module FPGA, which are used to process the input video image signal. The display control component 010 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. The display panel 001 is used to generate an initial driving signal for driving the laser and an image display driving signal for driving the light modulation device.

[0081] The display control component 010 is used to generate an image display driving signal for driving the light modulator 011 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 beam and the light modulator, the display control component 010 also generates a driving signal for driving the light source to emit light. The driving signal may include an initial image enable signal EN and an initial current control signal, such as a pulse width modulation (PWM) signal, wherein the initial image enable signal EN is a timing control signal for coordinating the timing of the output of different luminous colors, and the PWM signal is a periodic square wave signal for controlling the brightness of the laser.

[0082] The laser driving circuit 030 is used to receive the image enable signal EN and the PWM signal output by the display control component 010, and directly control the lighting of the laser 040. The signal shaping current 020 can be used to generate a periodic sub-signal, shape the image enable signal EN or the PWM signal, and affect the signal waveform and period finally output to the laser 040.

[0083] Figure 7a The structure of the laser projection device provided in this application is shown in FIG. Figure 1 ,like Figure 7a As shown, the laser projection device includes a display control component 701 , a laser driving component 702 and a laser component 703 .

[0084] The laser assembly 703 includes multiple lasers and multiple switch assemblies ( Figure 7aOnly two lasers and three switch components are shown, namely, common cathode three-color laser 704, common cathode three-color laser 705, switch component 706, switch component 707, switch component 708). Multiple lasers are common cathode lasers or common anode lasers, and multiple lasers are connected through multiple switch components.

[0085] The laser driving component 702 includes a plurality of constant current components ( Figure 7a Three constant current components are shown, namely, constant current component 709, constant current component 710 and constant current component 711); multiple constant current components are connected to the laser component, for example, in Figure 7a In the figure, the current output end of the constant current component 709 is connected to the anode of the red sub-laser of the common cathode three-color laser 704 in the laser component 703, the current output end of the constant current component 710 is connected to the anode of the green sub-laser of the common cathode three-color laser 704 in the laser component 703, the current output end of the constant current component 711 is connected to the anode of the blue sub-laser of the common cathode three-color laser 704 in the laser component 703, and the current return ends of the constant current components 709, 710 and 711 are connected to the common cathode of the common cathode three-color laser 705.

[0086] The display control component 701 is respectively connected to a plurality of constant current components and a plurality of switch components, and is used to output PWM signals and enable signals to the constant current components; and output enable signals to the switch components.

[0087] For example, in Figure 7a In the figure, the display control component 701 is connected to the constant current component 709, the constant current component 710 and the constant current component 711, and is connected to the switch component 706, the switch component 707 and the switch component 708; the display control component 701 outputs a red PWM signal R_PWM to the constant current component 709, outputs a green PWM signal G_PWM to the constant current component 710, and outputs a blue PWM signal B_PWM to the constant current component 711; outputs an enable signal R_EN corresponding to red to the constant current component 709 and the switch component 706, outputs an enable signal G_EN corresponding to green to the constant current component 710 and the switch component 707, and outputs an enable signal B_EN corresponding to blue to the constant current component 711 and the switch component 708.

[0088] The switch component is used to turn on multiple lasers when the received enable signal is a valid potential; the effective potential refers to a high potential, also called a high level.

[0089] The constant current component is used to drive the laser component to emit light according to the PWM signal when the received enable signal is a valid potential.

[0090] For example, Figure 7bThe timing diagram of the enable signal, PWM signal, and current provided in this application, the enable signal and the PWM signal are both periodic signals, Figure 7b The enable signal and PWM signal in one cycle are shown in Figure 7b As shown, in the R1 period within a cycle, the R1 period is also the laser working period of the red sub-laser. In the R1 period, the enable signal R_EN is high, the enable signal G_EN is low, the enable signal B_EN is low, the red PWM signal R_PWM is a square wave signal, the green PWM signal G_PWM is a low-level signal, and the blue PWM signal B_PWM is a low-level signal. In the R1 period, the current R_I flowing through the red sub-laser first increases from 0 and then becomes constant. In the period from the end of the R1 period to the beginning of the G1 period, the current R_I gradually decreases to 0.

[0091] During the G1 period in a cycle, the G1 period is also the laser working period of the green sub-laser. During the G1 period, the enable signal R_EN is low level, the enable signal G_EN is high level, the enable signal B_EN is low level, the red PWM signal R_PWM is a low level signal, the green PWM signal G_PWM is a square wave signal, and the blue PWM signal B_PWM is a low level signal. During the G1 period, the current G_I flowing through the green sub-laser first increases from 0 and then becomes constant. During the period from the end of the G1 period to the beginning of the B1 period, the current G_I gradually decreases to 0.

[0092] During the B1 period in a cycle, the B1 period is also the laser working period of the blue sub-laser. During the B1 period, the enable signal R_EN is low level, the enable signal G_EN is low level, the enable signal B_EN is high level, the red PWM signal R_PWM is a low level signal, the green PWM signal G_PWM is a low level signal, and the blue PWM signal B_PWM is a square wave signal. During the B1 period, the current B_I flowing through the blue sub-laser first increases from 0 and then becomes constant. During the period from the end of the B1 period to the beginning of the next R1 period, the current B_I gradually decreases to 0. The duty ratios of the red PWM signal R_PWM, the green PWM signal G_PWM and the blue PWM signal B_PWM can be the same or different.

[0093] For example, in Figure 7aIn the embodiment, when the enable signal R_EN received by the switch component 706 is at a high level, it is adjusted to the on state, so that the common cathode of the common cathode three-color laser 704 and the anode of the red sub-laser of the common cathode three-color laser 705 are turned on. At this time, the enable signal R_EN received by the constant current component 709 is at a high level, and according to the received R_PWM signal, the driving voltage is applied to the laser component, and the constant current component 709 outputs current through the current output terminal, and the current passes through the red sub-laser of the common cathode three-color laser 704, the switch component 706, and the red sub-laser of the common cathode three-color laser 705 in sequence, and then flows back to the constant current component 709 through the current return terminal of the constant current component 709, and the common cathode of the common cathode three-color laser 704 and the red sub-laser in the common cathode three-color laser 705 light up and emit red light.

[0094] When the enable signal G_EN received by the switch component 707 is at a high level, it is adjusted to the on state, so that the common cathode of the common cathode three-color laser 704 and the anode of the green sub-laser of the common cathode three-color laser 705 are turned on. At this time, the enable signal G_EN received by the constant current component 710 is at a high level, and according to the G_PWM signal it receives, the driving voltage is applied to the laser component, and the constant current component 710 outputs current through the current output terminal, and the current passes through the green sub-laser of the common cathode three-color laser 704, the switch component 706, and the green sub-laser of the common cathode three-color laser 705 in sequence, and then flows back to the constant current component 710 through the current return terminal of the constant current component 710, and the common cathode of the common cathode three-color laser 704 and the green sub-laser in the common cathode three-color laser 705 light up and emit green light.

[0095] When the enable signal B_EN received by the switch component 708 is at a high level, it is adjusted to the on state, so that the common cathode of the common cathode three-color laser 704 and the anode of the blue sub-laser of the common cathode three-color laser 705 are turned on. At this time, the enable signal B_EN received by the constant current component 711 is at a high level, and according to the B_PWM signal it receives, the driving voltage is applied to the laser component, and the constant current component 711 outputs current through the current output terminal, and the current passes through the blue sub-laser of the common cathode three-color laser 704, the switch component 706, and the blue sub-laser of the common cathode three-color laser 705 in sequence, and then flows back to the constant current component 711 through the current return terminal of the constant current component 711, and the common cathode of the common cathode three-color laser 704 and the blue sub-laser in the common cathode three-color laser 705 light up and emit blue light.

[0096] It should be noted that the laser projection device also includes a power supply, which is connected to the display control component and each constant current component to supply power to the display control component and each constant current component. Figure 7aAs shown, the laser projection device also includes a power supply 712 , which is connected to the display control component 701 , the constant current component 709 , the constant current component 710 , and the constant current component 711 .

[0097] The following is an explanation of the laser series connection.

[0098] If the laser in the laser projection device is a common cathode laser, then for the first laser and the second laser in the two lasers connected in series, the anode of the sub-laser in the second laser is respectively connected to the first end of the corresponding switch component; the second end of the switch component connected to the second laser is connected to the common cathode of the first laser.

[0099] For example, Figure 7a As shown, Figure 7a The laser shown is a common cathode three-color laser, the first laser is a common cathode three-color laser 704, the second laser is a common cathode three-color laser 705, the anode of the red sub-laser in the common cathode three-color laser 705 is connected to the first end of the switch component 706 corresponding to the red color, the anode of the green sub-laser in the common cathode three-color laser 705 is connected to the first end of the switch component 707 corresponding to the green color, the anode of the blue sub-laser in the common cathode three-color laser 705 is connected to the first end of the switch component 708 corresponding to the blue color, and the common cathode of the common cathode three-color laser 704 is respectively connected to the second ends of the switch components 706, 707, and 708.

[0100] It should be noted that the laser in the laser projection device can also be a common cathode two-color laser. Figure 7a On the basis of, for example, Figure 8 The structure of the laser projection device provided in this application is shown in FIG. Figure 2 ,like Figure 8 As shown, the laser in the figure is a common cathode two-color laser, wherein the sub-lasers are a red sub-laser and a green sub-laser. The laser driving component 702 also only includes two constant current components, namely a constant current component 709 and a constant current component 710. The current output end of the constant current component 709 is connected to the anode of the red sub-laser of the common cathode two-color laser 713 in the laser component 703, the current output end of the constant current component 710 is connected to the anode of the green sub-laser of the common cathode two-color laser 713 in the laser component 703, and the current return end of the constant current component 709 and the constant current component 710 is connected to the common cathode of the common cathode two-color laser 714.

[0101] exist Figure 8In the figure, the first laser is a common cathode two-color laser 713, the second laser is a common cathode two-color laser 714, the anode of the red sub-laser in the common cathode two-color laser 714 is connected to the first end of the switch component 706 corresponding to the red color, the anode of the green sub-laser in the common cathode two-color laser 714 is connected to the first end of the switch component 707 corresponding to the blue color, and the common cathode of the common cathode two-color laser 713 is connected to the second ends of the switch components 706 and 707 respectively.

[0102] It should be noted that the sub-lasers in the common cathode two-color laser can also be a blue sub-laser and a green sub-laser, or a red sub-laser and a blue sub-laser. The embodiments of the present application do not limit the sub-lasers in the common cathode two-color laser and can be set according to actual conditions.

[0103] If the laser in the laser projection device is a common anode laser, then for the third laser and the fourth laser in the two series-connected lasers, the cathode of the neutron laser in the third laser is respectively connected to the first end of the corresponding switch component; the second end of the switch component connected to the third laser is connected to the common anode of the fourth laser.

[0104] For example, in Figure 7a On the basis of Fig. 9 Schematic diagram of the structure of the laser projection equipment provided for the application Figure 3 ,like Fig. 9 As shown, the lasers in the figure are common anode lasers, namely, common anode three-color laser 715 and common anode three-color laser 716. The current output ends of constant current components 709, 710 and 711 are connected to the common anode of the common anode three-color laser 715 in the laser component 703, the current return end of the constant current component 709 is connected to the cathode of the red sub-laser of the common anode three-color laser 716, the current return end of the constant current component 710 is connected to the cathode of the green sub-laser of the common anode three-color laser 716, and the current return end of the constant current component 711 is connected to the cathode of the blue sub-laser of the common anode three-color laser 716.

[0105] exist Fig. 9 In the embodiment, the third laser is a common anode three-color laser 715, the fourth laser is a common anode three-color laser 716, the cathode of the red sub-laser in the common anode three-color laser 715 is connected to the first end of the switch component 706 corresponding to the red color, the cathode of the green sub-laser in the common anode three-color laser 715 is connected to the first end of the switch component 707 corresponding to the green color, the cathode of the blue sub-laser in the common anode three-color laser 715 is connected to the first end of the switch component 708 corresponding to the blue color, and the common cathode of the common anode three-color laser 716 is respectively connected to the second ends of the switch components 706, 707, and 708.

[0106] When the enable signal R_EN received by the switch component 706 is at a high level, the switch component 706 is adjusted to a conducting state, so that the cathode of the red sub-laser of the common anode three-color laser 715 is connected to the common anode of the common anode three-color laser 716. When the enable signal G_EN received by the switch component 707 is at a high level, the switch component 707 is adjusted to a conducting state, so that the cathode of the green sub-laser of the common anode three-color laser 715 is connected to the common anode of the common anode three-color laser 716. When the enable signal B_EN received by the switch component 708 is at a high level, the switch component 708 is adjusted to a conducting state, so that the cathode of the blue sub-laser of the common anode three-color laser 715 is connected to the common anode of the common anode three-color laser 716.

[0107] When the enable signal R_EN received by the constant current component 709 is at a high level, a driving voltage is applied to the laser component according to the received R_PWM signal, and the constant current component 709 outputs current through the current output terminal. The current passes through the red sub-laser of the common anode three-color laser 715, the switch component 706, and the red sub-laser of the common anode three-color laser 716 in sequence, and then flows back to the constant current component 709 through the current return terminal of the constant current component 709. The common cathode of the common anode three-color laser 715 and the red sub-laser in the common anode three-color laser 716 light up and emit red light. Since when the enable signal R_EN received by the constant current component 709 is at a high level, the enable signal R_EN received by the constant current component 710 and the constant current component 711 is at a high level or a low level, the constant current component 710 and the constant current component 711 will not receive the current from the common anode three-color laser 716, so the common cathode of the common anode three-color laser 715 and the green sub-laser and the blue sub-laser in the common anode three-color laser 716 will not light up.

[0108] It should be noted that the process of lighting up the green sub-laser and the blue sub-laser is similar to the process of lighting up the red sub-laser, and will not be described in detail here.

[0109] It should be noted that the laser in the laser projection device can also be a common anode two-color laser. Figure 7a On the basis of, for example, Fig.10 The structure of the laser projection device provided in this application is shown in FIG. Figure 4 ,like Fig.10As shown, the laser in the figure is a common anode two-color laser, wherein the sub-lasers are a red sub-laser and a green sub-laser. The laser driving component 702 also only includes two constant current components, namely a constant current component 709 and a constant current component 710. The current output ends of the constant current components 709 and 710 are connected to the common anode of the common anode two-color laser 717 in the laser component 703, the current return end of the constant current component 709 is connected to the cathode of the red sub-laser of the common anode two-color laser 718, and the current return end of the constant current component 710 is connected to the cathode of the green sub-laser of the common anode two-color laser 718.

[0110] exist Fig.10 In the figure, the third laser is a common anode two-color laser 717, the fourth laser is a common anode two-color laser 718, the cathode of the red sub-laser in the common anode two-color laser 717 is connected to the first end of the switch component 706 corresponding to the red color, the cathode of the green sub-laser in the common anode two-color laser 717 is connected to the first end of the switch component 707 corresponding to the blue color, and the common cathode of the common anode two-color laser 718 is respectively connected to the second ends of the switch components 706 and 707.

[0111] It should be noted that the sub-lasers in the common anode two-color laser can also be a blue sub-laser and a green sub-laser, or a red sub-laser and a blue sub-laser. The embodiments of the present application do not limit the sub-lasers in the common anode two-color laser and can be set according to actual conditions.

[0112] For example, Fig.11 The schematic diagram of the structure of multiple common cathode three-color lasers connected in series provided by the present application is as follows: Fig.11 As shown, the figure shows four common cathode three-color lasers. For every two common cathode three-color lasers connected in series, the anode of the red sub-laser of one common cathode three-color laser is connected to one end of the switch component corresponding to red, the anode of the green sub-laser is connected to one end of the switch component corresponding to green, the anode of the blue sub-laser is connected to one end of the switch component corresponding to blue, and the common cathode of another common cathode three-color laser is connected to the other end of the three switch components. For the first common cathode three-color laser among the four common cathode three-color lasers connected in series, the anode of the red sub-laser is connected to the current output end of the constant current component corresponding to red, the anode of the green sub-laser is connected to the current output end of the constant current component corresponding to green, and the anode of the blue sub-laser is connected to the current output end of the constant current component corresponding to blue. The common cathode of the fourth common cathode three-color laser among the four common cathode three-color lasers connected in series is connected to the current return end of each constant current component. Fig.11 The switch component in the display is connected to the display control component, and the enable signal corresponding to the different luminous colors can be transmitted to the corresponding switch component.

[0113] It should be noted that the series structure of multiple common cathode two-color lasers is similar to that of common cathode three-color lasers, and will not be described in detail here. The embodiment of the present application does not limit the number of common cathode lasers, and can be set according to actual conditions.

[0114] For example, Fig.12 The schematic diagram of the structure of multiple common anode three-color lasers connected in series provided by the present application is as follows: Fig.12 As shown, the figure shows four common anode three-color lasers. For every two common anode three-color lasers connected in series, the cathode of the red sub-laser of one common anode three-color laser is connected to one end of the switch component corresponding to red, the cathode of the green sub-laser is connected to one end of the switch component corresponding to green, the cathode of the blue sub-laser is connected to one end of the switch component corresponding to blue, and the common anode of another common anode three-color laser is connected to the other end of the three switch components. For the fourth common anode three-color laser in the four common anode three-color lasers connected in series, the cathode of the red sub-laser is connected to the current return end of the constant current component corresponding to red, the cathode of the green sub-laser is connected to the current return end of the constant current component corresponding to green, and the cathode of the blue sub-laser is connected to the current return end of the constant current component corresponding to blue. The common anode of the first common anode three-color laser in the four common anode three-color lasers connected in series is connected to the current output end of each constant current component. Fig.12 The switch component in the display is connected to the display control component, and the enable signal corresponding to the different luminous colors can be transmitted to the corresponding switch component.

[0115] It should be noted that the series structure of multiple common anode two-color lasers is similar to the common anode three-color laser, and will not be described in detail here. The embodiment of the present application does not limit the number of common anode lasers, and can be set according to actual conditions.

[0116] It should be noted that the switch component in the laser component can be a metal-oxide-semiconductor field-effect transistor (MOS tube for short), the gate of the MOS tube is the control end of the switch tube, and the gate of the MOS tube is connected to the display control component for receiving the enable signal sent by the display control component. The source of the MOS tube is connected to the common cathode of the three-color laser with a common cathode, or the common cathode of the two-color laser with a common cathode, or the cathode of the sub-laser in the three-color laser with a common anode, or the cathode of the sub-laser in the two-color laser with a common anode. The drain of the MOS tube is connected to the anode of the sub-laser in the three-color laser with a common cathode, or the anode of the sub-laser in the two-color laser with a common cathode, or the common anode of the three-color laser with a common anode, or the common anode of the two-color laser with a common anode. When the gate of the MOS tube is at a high level, the source and drain of the MOS tube are turned on, so that the sub-lasers of the same luminous color in the series-connected lasers are turned on.

[0117] The switch component in the laser component can be a triode, and the base of the triode is the control end of the switch tube. The base of the triode is connected to the display control component for receiving the enable signal sent by the display control component. The collector of the triode is connected to the common cathode of the common cathode three-color laser, or the common cathode of the common cathode two-color laser, or the cathode of the sub-laser in the common anode three-color laser, or the cathode of the sub-laser in the common anode two-color laser. The emitter of the triode is connected to the anode of the sub-laser in the common cathode three-color laser, or the anode of the sub-laser in the common cathode two-color laser, or the common anode of the common anode three-color laser, or the common anode of the common anode two-color laser. When the base of the triode is at a high level, the base emitter and collector of the triode are turned on, so that the sub-lasers of the same luminous color in the series-connected lasers are turned on.

[0118] The laser projection device provided by the present embodiment includes a plurality of lasers and a plurality of switch components through a laser component. Each laser is a common cathode laser or a common anode laser. Every two lasers are connected by a switch component corresponding to each light emitting color of the laser, so that the series connection of common cathode lasers or common anode lasers can be realized, so that the currents of the plurality of common cathode lasers or common anode lasers are consistent, and thus the brightness of the displayed picture is consistent; the use of a plurality of lasers makes the brightness of the displayed picture higher; the use of a constant current component according to the number of light emitting colors of the laser can effectively reduce the number of chips, reduce costs, facilitate miniaturization, and reduce the common magnetic interference generated.

[0119] exist Figure 7a On the basis of Fig.13 The structure of the laser projection device provided in this application is shown in FIG. Figure 5 , the following combination Fig.13The constant current components are described.

[0120] The constant current component includes a constant current chip, a voltage regulating component and a sampling resistor; for example, Fig.13 As shown, the constant current component 709 includes a constant current chip 719, a voltage regulating component 720 and a sampling resistor 721; the constant current component 710 includes a constant current chip 722, a voltage regulating component 723 and a sampling resistor 724; the constant current component 711 includes a constant current chip 725, a voltage regulating component 726 and a sampling resistor 727.

[0121] The display control component is respectively connected to the constant current chips in the multiple constant current components, and is used to output PWM signals and enable signals to the constant current chips in the multiple constant current components.

[0122] For example, in Fig.13 In the figure, the display control component 701 is connected to the constant current chip 719, the constant current chip 722 and the constant current chip 725. The display control component 701 outputs a red PWM signal R_PWM to the constant current chip 719, outputs a green PWM signal G_PWM to the constant current chip 722, and outputs a blue PWM signal B_PWM to the constant current chip 725; outputs an enable signal R_EN corresponding to red to the constant current chip 719, outputs an enable signal G_EN corresponding to green to the constant current chip 722, and outputs an enable signal B_EN corresponding to blue to the constant current chip 725.

[0123] The constant current chip in the constant current component is connected to the voltage regulating component, the constant current chip, the voltage regulating component and one end of the sampling resistor in the constant current component are connected, the other end of the sampling resistor is grounded, and the voltage regulating component is connected to the laser component.

[0124] For example, in Fig.13 In the embodiment, the current output end of the constant current chip 719 in the constant current component 709 is connected to the current input end of the voltage regulating component 720, the current output end of the voltage regulating component 720 is connected to the anode of the red sub-laser of the common cathode three-color laser 704 in the laser component 703, the common cathode of the common cathode three-color laser 705 in the laser component 703 is connected to the current return end of the voltage regulating component 720, the current return output end of the voltage regulating component 720 is connected to the sampling end of the constant current chip 719 and one end of the sampling resistor 721 in the constant current component 709, and the other end of the sampling resistor 721 is grounded; the control signal output end of the constant current chip 719 is connected to the control end of the constant current component 719, and the constant current chip 719 outputs a control signal to the constant current component 720 through the control signal output end.

[0125] The current output end of the constant current chip 722 in the constant current component 710 is connected to the current input end of the voltage regulating component 723, the current output end of the voltage regulating component 723 is connected to the anode of the green sub-laser of the common cathode three-color laser 704 in the laser component 703, the common cathode of the common cathode three-color laser 705 in the laser component 703 is connected to the current return end of the voltage regulating component 723, the current return output end of the voltage regulating component 723 is connected to the sampling end of the constant current chip 722, and the other end of the sampling resistor 724 is grounded; the control signal output end of the constant current chip 722 is connected to the control end of the constant current component 723, and the constant current chip 722 outputs a control signal to the constant current component 723 through the control signal output end.

[0126] The current output end of the constant current chip 725 in the constant current component 711 is connected to the current input end of the voltage regulating component 726, the current output end of the voltage regulating component 726 is connected to the anode of the blue sub-laser of the common cathode three-color laser 704 in the laser component 703, the common cathode of the common cathode three-color laser 705 in the laser component 703 is connected to the current return end of the voltage regulating component 726, the current return output end of the voltage regulating component 726 is connected to the sampling end of the constant current chip 725 and one end of the sampling resistor 727 in the constant current component 711, and the other end of the sampling resistor 727 is grounded; the control signal output end of the constant current chip 725 is connected to the control end of the constant current component 726, and the constant current chip 725 outputs a control signal to the constant current component 726 through the control signal output end.

[0127] The constant current chip is used to output a control signal and load voltage to the voltage regulating component according to the voltage of the received PWM signal and the sampling current obtained through the sampling resistor when the received enable signal is a valid potential; the voltage regulating component is used to load a driving voltage to the laser component according to the received control signal, so as to drive each laser in the laser component to emit light.

[0128] For example, in Fig.13 In the embodiment, when the enable signal R_EN received by the constant current chip 719 is at a high level, the constant current chip 719 collects the sampled current flowing out of the current return output end of the voltage regulating component 720 through the sampling end according to the received R_PWM signal, and outputs a control signal and a loading voltage to the voltage regulating component 720. The voltage regulating component 720 adjusts the voltage loaded on itself according to the received control signal to obtain a driving voltage, and then loads the driving voltage to the laser component. The voltage regulating component 720 outputs current through the current output end, and the current passes through the red sub-laser of the common cathode three-color laser 704, the switch component 706, and the red sub-laser of the common cathode three-color laser 705 in sequence, and then flows back to the voltage regulating component 720 through the current return end of the voltage regulating component 720, and then the current flows into the ground through the sampling resistor 721, and the common cathode of the common cathode three-color laser 704 and the red sub-laser in the common cathode three-color laser 705 light up and emit red light.

[0129] When the enable signal G_EN received by the constant current chip 722 is at a high level, the constant current chip 722 collects the sampled current flowing out of the current return output end of the voltage regulating component 723 through the sampling end according to the received G_PWM signal, and outputs a control signal and a loaded voltage to the voltage regulating component 723. The voltage regulating component 723 adjusts the voltage loaded on itself to obtain a driving voltage according to the received control signal, and then loads the driving voltage to the laser component. The voltage regulating component 723 outputs current through the current output end, and the current passes through the green sub-laser of the common cathode three-color laser 704, the switch component 707, and the green sub-laser of the common cathode three-color laser 705 in sequence, and then flows back to the voltage regulating component 723 through the current return end of the voltage regulating component 723, and then the current flows into the ground through the sampling resistor 724, and the common cathode of the common cathode three-color laser 704 and the green sub-laser in the common cathode three-color laser 705 light up and emit green light.

[0130] When the enable signal B_EN received by the constant current chip 725 is at a high level, the constant current chip 725 collects the sampled current flowing out of the current return output end of the voltage regulating component 726 through the sampling end according to the received B_PWM signal, and outputs a control signal and a loaded voltage to the voltage regulating component 726. The voltage regulating component 726 adjusts the voltage loaded on itself according to the received control signal to obtain a driving voltage, and then loads the driving voltage to the laser component. The voltage regulating component 726 outputs current through the current output end, and the current passes through the blue sub-laser of the common cathode three-color laser 704, the switch component 708, and the green sub-laser of the common cathode three-color laser 705 in sequence, and then flows back to the voltage regulating component 726 through the current return end of the voltage regulating component 726, and then the current flows into the ground through the sampling resistor 727, and the common cathode of the common cathode three-color laser 704 and the blue sub-laser in the common cathode three-color laser 705 light up and emit blue light.

[0131] For example, in Fig.13 On the basis of Fig.14 Schematic diagram of the local circuit structure for driving the red sub-laser provided in this application Figure 1 ,like Fig.14 As shown, the voltage regulating component 720 is a Buck circuit, which includes a switch component, a diode and an inductor.

[0132] The first end of the switch component is the current return output end of the voltage regulating component, the second end of the switch component is connected to the positive electrode of the diode, the second end of the switch component is the current return end of the voltage regulating component, and the control end of the switch component is the control end of the voltage regulating unit component. The cathode of the diode is connected to the first end of the inductor, the first end of the inductor is the current input end of the voltage regulating component, and the second end of the inductor is the current output end of the voltage regulating unit.

[0133] The constant current chip sends a control signal to the control end of the switch component. When the control signal is an effective potential (high level), the switch component is turned on; when the control signal is an invalid potential (low level), the switch component is turned off. By adjusting the duration of the effective potential and the invalid potential, the duration of the switch component being turned on and off can be adjusted, thereby adjusting the duty cycle and adjusting the voltage. The Buck circuit is a step-down circuit.

[0134] The Buck circuit reduces the voltage provided by the constant current chip to the operating voltage of the laser, so that the laser can work normally under a constant current.

[0135] It should be noted that the Buck circuit may further include a capacitor, one end of the capacitor is connected to the second end of the inductor, and the other end of the capacitor is connected to the anode of the diode.

[0136] It should be noted that Fig.14 It is only an example to illustrate the voltage regulating component in the current driving the red sub-laser. When the voltage regulating component is a Buck circuit, other voltage regulating components in the laser projection device are also Buck circuits, which will not be described in detail here.

[0137] For example, in Fig.13 On the basis of Fig.15 Schematic diagram of the local circuit structure for driving the red sub-laser provided in this application Figure 2 ,like Fig.15 As shown, the voltage regulating component 720 is a Boost circuit, which includes a switch component, a diode and an inductor.

[0138] The first end of the switch component is the current return output end of the voltage regulating component and also the current return end of the voltage regulating component. The second end of the switch component is connected to the positive electrode of the diode and the first end of the inductor. The control end of the switch component is the control end of the voltage regulating component. The cathode of the diode is the current output end of the voltage regulating component, and the second end of the inductor is the current input end of the voltage regulating component.

[0139] The constant current chip sends a control signal to the control end of the switch component. When the control signal is an effective potential (high level), the switch component is turned on; when the control signal is an invalid potential (low level), the switch component is turned off. By adjusting the duration of the effective potential and the invalid potential, the duration of the switch component being turned on and off can be adjusted, thereby adjusting the duty cycle and adjusting the voltage. The Boost circuit is a boost circuit.

[0140] The Boost circuit increases the voltage provided by the constant current chip to the operating voltage of the laser, so that the laser can work normally under a constant current.

[0141] It should be noted that the Boost circuit may further include a capacitor, one end of the capacitor is connected to the cathode of the diode, and the other end of the capacitor is connected to the first end of the switch component.

[0142] It should be noted that Fig.15 It is only an example to illustrate the voltage regulating component in the current driving the red sub-laser. When the voltage regulating component is a Boost circuit, other voltage regulating components in the laser projection device are also Boost circuits, which will not be described in detail here.

[0143] For example, in Fig.13 On the basis of Fig.16 Schematic diagram of the local circuit structure for driving the red sub-laser provided in this application Figure 3 ,like Fig.16 As shown, the voltage regulating component 720 is a Buck-Boost circuit, which includes a switch component, a diode and an inductor.

[0144] The first end of the switch component is the current return output end of the voltage regulating component, the second end of the switch component is connected to the first end of the inductor, the second end of the switch component is the current return end of the voltage regulating component, and the control end of the switch component is the control end of the voltage regulating component. The second end of the inductor is connected to the cathode of the diode, the cathode of the diode is the current input end of the voltage regulating unit, and the anode of the diode is the current output end of the voltage regulating unit.

[0145] The constant current chip sends a control signal to the control end of the switch component. When the control signal is an effective potential (high level), the switch component is turned on; when the control signal is an invalid potential (low level), the switch component is turned off. By adjusting the duration of the effective potential and the invalid potential, the duration of the switch component being turned on and off can be adjusted, thereby adjusting the duty cycle and the voltage. The Buck-Boost circuit can both boost and reduce the voltage.

[0146] When the voltage provided by the constant current chip is different from the operating voltage of the laser, the Buck-Boost circuit adjusts the voltage provided by the constant current chip to the operating voltage of the laser, so that the laser can work normally under a constant current.

[0147] It should be noted that the Buck-Boost circuit may further include a capacitor, one end of the capacitor is connected to the anode of the diode, and the other end of the capacitor is connected to the second end of the switch tube.

[0148] It should be noted that Fig.16 It is only an example to illustrate the voltage regulating component in the current driving the red sub-laser. When the voltage regulating component is a Buck-Boost circuit, other voltage regulating components in the laser projection device are also Buck-Boost circuits, which will not be described in detail here.

[0149] It should be noted that the switching tube in the voltage regulating component can be a MOS tube, a triode, or an electronic device or circuit that can be turned on and off according to the level of the control signal. The embodiment of the present application does not limit the switching tube in the voltage regulating component and can be set according to actual conditions.

[0150] The laser projection device provided in this embodiment can accurately control the current value flowing into multiple lasers through the constant current chip and voltage regulating component in the constant current component, keep the current stable, and can also adjust the voltage to ensure that the laser can operate at the working voltage, and also ensure the safe operation of the laser projection device. In addition, there are fewer constant current components in this solution, and the switch components therein are correspondingly fewer, which can effectively reduce costs, reduce occupied volume, reduce energy loss, and reduce common magnetic interference.

[0151] An embodiment of the present application also provides a laser projection device, which includes a display control component, a laser driving component, and a laser component.

[0152] The laser driving component includes a plurality of constant current components, and the plurality of constant current components are connected to the laser component;

[0153] The display control component is respectively connected to the multiple constant current components, and is used to output a pulse width modulation signal and an enable signal to the multiple constant current components;

[0154] The laser assembly includes a plurality of lasers and a plurality of switch assemblies, wherein the plurality of lasers are common cathode lasers or common anode lasers, and the plurality of lasers are connected via a plurality of switch assemblies;

[0155] The display control components are respectively connected to the multiple switch components and are used to output enable signals to the multiple switch components.

[0156] Fig.17 The flowchart of the laser control method provided in this application is as follows: Fig.17 As shown, the laser control method includes the following steps:

[0157] S1701: Acquire a laser working period, a target switch component among multiple switch components, and a target constant current component among multiple constant current components.

[0158] In this step, in order to display the image, within one cycle, each sub-laser in the laser lights up during its laser working period, so the display control component needs to obtain the working period, the target switch component among multiple switch components, and the target constant current component among multiple constant current components.

[0159] S1702: During the laser operation period, the enable signal output to the target switch component and the target constant current component is controlled to be a valid potential.

[0160] In this step, after the display control component obtains the working period, the target switch component and the target constant current component, the enable signal output to the target switch component and the target constant current component is controlled to be a valid potential during the laser working period.

[0161] When the target switch tube receives an enable signal of valid potential, it is adjusted to the on state to turn on the two lasers connected to the target switch tube. When the target constant current component receives an enable signal of valid potential, it loads a driving voltage to the laser component according to the PWM signal and outputs current to the laser component. The current flows through the target sub-laser and the target switch component of each laser in the laser component and then flows back to the target constant current component, and the target sub-laser emits light.

[0162] S1703: monitor whether the laser working period has ended; if it is monitored that the laser working period has not ended, execute step S1702; if it is monitored that the laser working period has ended, execute step S1704.

[0163] S1704: Control the enable signal output to the target switch component and the target constant current component to be an invalid potential.

[0164] In the above steps, the display control component detects whether the laser working period has ended; if it is detected that the laser working period has not ended, it means that it is still in the laser working period and the laser needs to work, then step S1702 is executed; if it is detected that the laser working period has ended, then when the display control component ends the laser working period, the enable signal output to the target switch component and the target constant current component is controlled to be an invalid potential (low potential, also called a low level).

[0165] When the target switch tube receives an invalid enable signal, it is adjusted to the disconnected state, disconnecting the two lasers connected to the target switch tube. When the target constant current component receives an invalid enable signal, it stops loading the drive voltage to the laser component, stops outputting current to the laser component, and the target sub-laser in the laser component is extinguished.

[0166] The laser projection device provided by the present application includes a plurality of lasers and a plurality of switch components through a laser component. The laser is a common cathode laser or a common anode laser. The two lasers are connected through a switch component, which can realize the series connection of the common cathode laser or the common anode laser, so that the current of the plurality of common cathode lasers or the common anode lasers is consistent, and thus the brightness of the displayed picture is consistent; the use of a plurality of lasers makes the brightness of the displayed picture higher; and the use can also effectively reduce the number of chips, reduce costs, facilitate miniaturization, and reduce the common magnetic interference generated.

[0167] 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.

[0168] 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.

[0169] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser projection device, characterized in that: include: Display control components, laser drive components, laser components; The laser driving component includes a plurality of constant current components, and the plurality of constant current components are connected to the laser component; The display control component is connected to the multiple constant current components respectively, and is used to output a pulse width modulation signal and an enable signal to the multiple constant current components; The multiple constant current components are used to drive the laser component to emit light according to the pulse width modulation signal when the received enable signal is a valid potential; The laser assembly includes a plurality of lasers and a plurality of switch assemblies, wherein the plurality of lasers are common cathode lasers or common anode lasers, and the plurality of lasers are connected via the plurality of switch assemblies; The display control component is connected to the plurality of switch components respectively, and is used to output an enable signal to the plurality of switch components; The plurality of switch components are used to turn on the plurality of lasers when the received enable signal is the effective potential.

2. The laser projection device according to claim 1, characterized in that: The multiple lasers are common cathode lasers; For the first laser and the second laser in the two lasers connected in series, the anode of the sub-laser in the second laser is respectively connected to the first end of the corresponding switch component; The second end of the switch component connected to the second laser is connected to the common cathode of the first laser.

3. The laser projection device according to claim 1, characterized in that: The multiple lasers are common anode lasers; For the third laser and the fourth laser in the two lasers connected in series, the cathodes of the sub-lasers in the third laser are respectively connected to the first ends of the corresponding switch components; The second end of the switch component connected to the third laser is connected to the common anode of the fourth laser.

4. The laser projection device according to claim 1, characterized in that: The constant current component includes a constant current chip, a voltage regulating component and a sampling resistor; The display control components are respectively connected to the constant current chips in the multiple constant current components, and are used to output pulse width modulation signals and enable signals to the constant current chips in the multiple constant current components; The constant current chip in the constant current component is connected to the voltage regulating component, the constant current chip and the voltage regulating component are connected to one end of the sampling resistor in the constant current component, the other end of the sampling resistor is grounded, and the voltage regulating component is connected to the laser component; The constant current chip is used to output a control signal and a loading voltage to the voltage regulating component according to the voltage of the received pulse width modulation signal and the sampling current obtained through the sampling resistor when the received enable signal is the effective potential; the voltage regulating component is used to load a driving voltage to the laser component according to the received control signal to drive each laser in the laser component to emit light.

5. The laser projection device according to claim 4, characterized in that: Each voltage regulating component is a Buck circuit.

6. The laser projection device according to claim 4, characterized in that: Each voltage regulating component is a Boost circuit.

7. The laser projection device according to claim 4, characterized in that: Each voltage regulating component is a Buck-Boost circuit.

8. The laser projection device according to claim 1, characterized in that: Each switch component is a triode.

9. The laser projection device according to claim 1, characterized in that: Each switch component is a metal-oxide semiconductor field effect transistor (MOS).

10. A laser projection device, characterized in that: include: Display control components, laser drive components, laser components; The laser driving component includes a plurality of constant current components, and the plurality of constant current components are connected to the laser component; The display control component is connected to the multiple constant current components respectively, and is used to output a pulse width modulation signal and an enable signal to the multiple constant current components; The laser assembly includes a plurality of lasers and a plurality of switch assemblies, wherein the plurality of lasers are common cathode lasers or common anode lasers, and the plurality of lasers are connected via the plurality of switch assemblies; The display control component is connected to the plurality of switch components respectively, and is used to output an enable signal to the plurality of switch components; The display control component acquires the laser working period, the target switch component among the multiple switch components, and the target constant current component among the multiple constant current components; During the laser operation period, controlling the enable signal output to the target switch component and the target constant current component to be an effective potential; When the received enable signal is at a valid potential, the target switch tube turns on two lasers connected to the target switch tube; When the enable signal received by the target constant current component is the effective potential, the drive voltage is loaded to the laser component according to the pulse width modulation signal, and the current is output to the laser component. The current flows through each laser in the laser component and the target switch component and then flows back to the target constant current component, and each laser emits light.

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