Laser projection equipment, color wheel control method and device and storage medium

Abstract

The embodiment of the invention belongs to the laser projection technology, and provides laser projection equipment, a color wheel control method and device and a storage medium. The laser projection equipment comprises a color wheel, a detection device, a digital light processing device and a control device, n marks are arranged on the color wheel; the value of N is related to the color wheel type; n is an integer greater than or equal to 1; the digital light processing device is used for controlling the color wheel to rotate according to a preset color wheel driving frequency; the detection device is used for detecting the rotation frequency of the color wheel based on the N marks; the control device connected with the detection device is configured to identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device; and executing color wheel control logic corresponding to the type of the color wheel. According to the invention, the laser projection equipment is compatible with different types of color wheels.

Description

Technical Field

[0001] The embodiments of the present application relate to laser projection technology, and more specifically, to a laser projection device, a color wheel control method, a device, and a storage medium. Background Art

[0002] The color wheel is a key component of the laser projection device. In existing laser projection devices, it is necessary to configure the laser projection device with an MCU with different control logics, that is, different types of MCUs, according to different types of color wheels. However, configuring different types of MCUs may lead to problems such as high difficulty and low efficiency in the on-site production of the laser projection device (for example, the need to produce two different types of MCUs) and the maintenance of the laser projection device. Summary of the invention

[0003] The exemplary embodiments of the present application provide a laser projection device, a color wheel control method, an apparatus, and a storage medium, which can make the laser projection device compatible with different types of color wheels.

[0004] In a first aspect, the present application provides a laser projection device, the laser projection device comprising: a color wheel, a detection device, a digital light processing device, and a control device; N marks are arranged on the color wheel; the value of N is related to the type of the color wheel; N is an integer greater than or equal to 1;

[0005] The digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency;

[0006] The detection device is used to detect the rotation frequency of the color wheel based on the N marks;

[0007] The control device connected to the detection device is configured to: identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device;

[0008] Execute the color wheel control logic corresponding to the type of the color wheel.

[0009] In some embodiments, N is an even number, and the N marks are symmetrical in pairs on the color wheel.

[0010] In some embodiments, the color wheel is a dual color wheel, the dual color wheel comprising: a first color wheel and a second color wheel, the first color wheel and the second color wheel are both provided with the N marks, and the control device is further configured to:

[0011] Acquire a first induction pulse signal output by the detection device when detecting the N marks on the first color wheel, and detect a second induction pulse signal output by the N marks on the second color wheel; the first induction pulse signal and the second induction pulse signal are both periodic pulse signals;

[0012] The first sensing pulse signal and the second sensing pulse signal are synchronized to synchronize the first color wheel and the second color wheel.

[0013] In some embodiments, the type of the color wheel is a first type or a second type; the rated rotation frequency of the color wheel of the first type is twice the rated rotation frequency of the color wheel of the second type; the preset color wheel driving frequency is equal to the rated rotation frequency of the color wheel of the second type; the color wheel of the first type is provided with one of the marks, and the color wheel of the second type is provided with two of the marks; the identifying the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device includes:

[0014] If the rotation frequency of the color wheel detected by the detection device is equal to the preset color wheel driving frequency, determining that the type of the color wheel is the first type;

[0015] If the rotation frequency of the color wheel detected by the detection device is twice the preset color wheel driving frequency, it is determined that the type of the color wheel is the second type.

[0016] In some embodiments, executing the color wheel control logic corresponding to the type of the color wheel includes:

[0017] If the type of the color wheel is the first type, a first indication message is sent to the digital light processing device, wherein the first indication message is used to instruct the digital light processing device to modify the preset color wheel driving frequency to a target color wheel driving frequency, so that the digital light processing device controls the rotation of the color wheel according to the target color wheel driving frequency; the target color wheel driving frequency is twice the preset color wheel driving frequency.

[0018] In some embodiments, if the type of the color wheel is the second type, the control device is further configured to:

[0019] Acquire the rotation frequency of the color wheel detected by the detection device; send 1 / 2 times the rotation frequency of the color wheel to the digital light processing device, so that the digital light processing device obtains a color wheel verification result for indicating whether the 1 / 2 times the rotation frequency of the color wheel is the same as the preset color wheel driving frequency according to the 1 / 2 times the rotation frequency of the color wheel;

[0020] Receiving the color wheel calibration result;

[0021] When the color wheel verification result is used to indicate that the rotation frequency of the 1 / 2 color wheel is different from the preset color wheel driving frequency, a shutdown process of the laser projection device is triggered.

[0022] In a second aspect, the present application provides a color wheel control method, wherein the laser projection device comprises: a color wheel, a detection device, a digital light processing device, and a control device; the color wheel is provided with N marks; the value of N is related to the type of the color wheel; N is an integer greater than or equal to 1; the digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency; the method is applied to the control device, and the method comprises:

[0023] Identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device; the rotation frequency of the color wheel is detected by the detection device based on the N marks;

[0024] Execute the color wheel control logic corresponding to the type of the color wheel.

[0025] In a third aspect, the present application provides a color wheel control device, the laser projection device comprising: a color wheel, a detection device, a digital light processing device, and a control device; the color wheel is provided with N marks; the value of N is related to the type of the color wheel; N is an integer greater than or equal to 1; the digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency; the color wheel control device is applied to the control device, and the color wheel control device comprises:

[0026] an identification module, configured to identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device; the rotation frequency of the color wheel is detected by the detection device based on the N marks;

[0027] The execution module is used to execute the color wheel control logic corresponding to the type of the color wheel.

[0028] In a fourth aspect, the present application provides a computer-readable storage medium having computer-executable instructions stored thereon. When the computer-executable instructions are executed by a processor, the method described in the second aspect is implemented.

[0029] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the second aspect when executed by a processor.

[0030] The laser projection device, color wheel control method, device and storage medium provided by the present application are related to the type of the color wheel by the number of marks set on the color wheel, and the rotation frequency of the color wheel detected by the detection device is related to the number of marks set on the color wheel. Therefore, the control device can identify the type of the color wheel through the rotation frequency of the color wheel detected by the detection device, and execute the color wheel control logic corresponding to the type of the color wheel. Through the above method, the control device can identify different types of color wheels and execute the color wheel control logic corresponding to the type of the color wheel, thereby achieving compatibility with different types of color wheels. Through the laser projection device provided by the present application, even if the laser projection device is configured with different types of color wheels, only one type of control device needs to be configured for the laser projection device, thereby improving the compatibility of the laser projection device with the color wheel type, thereby reducing the difficulty of on-site production and maintenance of the laser projection device, and improving the efficiency of production and maintenance of the laser projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 is a structural schematic diagram of a laser projection device provided in an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the structure of a fluorescent wheel in an 8-segment color wheel;

[0034] Figure 3 It is a schematic diagram of the structure of a color filter wheel in an 8-segment color wheel;

[0035] Figure 4 It is a schematic diagram of the structure of a fluorescent wheel in a 4-segment color wheel;

[0036] Figure 5 It is a schematic diagram of the structure of a color filter wheel in a 4-segment color wheel;

[0037] Figure 6 It is a structural schematic diagram of a laser projection device based on monochrome laser projection technology;

[0038] Figure 7 A schematic diagram of a flow chart of an existing color wheel control method;

[0039] Figure 8 A schematic diagram of the structure of a laser projection device provided in this application;

[0040] Fig. 9A schematic diagram of a flow chart of a color wheel control method provided in an embodiment of the present application;

[0041] Fig.10 A schematic diagram of the structure of another laser projection device provided in this application;

[0042] Fig.11 A schematic diagram of a flow chart of another color wheel control method provided in this application;

[0043] Fig.12 A schematic diagram of the structure of a color wheel control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] With the development of projection technology, the application of laser projection equipment such as projectors and laser TVs is becoming more and more common. Figure 1 Schematic diagram of the structure of a laser projection device provided in an embodiment of the present application. Figure 1 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 100, an optical machine 200, and a lens 300, wherein the light source 100 is used to provide a light source illumination beam, which is transmitted to the rear-end optical modulation device and the projection lens. The light source 100 may include a laser of at least one color, such as a blue laser, or a two-color laser, such as a blue laser and a red laser, or a three-color laser light source, including red, green, and blue lasers, for providing a three-color laser illumination beam.

[0048] The laser beam provided by the light source 100 enters the illumination optical path of the optical machine 200 after light combination and shaping. In the digital light processing (DLP) projection architecture, the digital micro-mirror device (DMD) chip is the core optical modulation device. The DMD chip receives the driving control signal corresponding to the image signal, and flips the thousands of tiny mirrors on its surface to the positive or negative angle corresponding to the driving signal, and reflects the light beam irradiating its surface into the lens 300.

[0049] The lens 300 may be an ultra-short-throw projection lens, and the ultra-short-throw projection lens 300 is used to project an image beam onto a projection screen, thereby realizing projection image display. The laser projection device in the above example may be an ultra-short-throw laser projection device.

[0050] Among them, since DLP uses DMD micro-lens reflection technology, in color processing, single-chip, two-chip or even three-chip DMD methods can use color wheels to complete color separation and processing. Usually, the color wheel is a combination of red, green, blue, white (yellow) and other color separation filters, which can separate the transmitted white light (yellow light) and rotate it through a high-speed motor, and then sequentially separate different monochromatic lights on the specified light path, and finally synthesize and project a full-color image through other optical and mechanical components. RGBY corresponds to red, green, blue, and yellow respectively. The first three colors are the primary colors for color development, and yellow can be used to brighten.

[0051] Usually the color wheel is a dual color wheel, which refers to the above-mentioned fluorescent wheel and color filter wheel. The fluorescent wheel has yellow fluorescent area, green fluorescent area, and transparent area; the color filter wheel has red transmission area, yellow transmission area, green transmission area, and transparent area. Generally, blue laser is used as the excitation laser, which is first irradiated on the fluorescent wheel to generate light (yellow light, green light, blue light); then irradiated through the color filter wheel (the transmitted light includes red light, yellow light, green light, and blue light).

[0052] A laser projection device may include a type of dual color wheel, such as an 8-segment color wheel, or a 4-segment color wheel. Figure 2 The figure is a schematic diagram of the structure of a fluorescent wheel in an 8-segment color wheel. Figure 3 FIG. 1 is a schematic diagram of the structure of a color filter wheel in an 8-segment color wheel. Figure 2 and Figure 3As shown, the rotation frequency of the 8-segment color wheel is 120 Hz (or Hz, hz), that is, 120 times per second, and the rotation frequency is 7200 revolutions per minute. The fluorescent wheel of the 8-segment color wheel is divided into 6 segments, namely yellow, green, transmission area, yellow, green, and transmission area (yellow is synthesized from red and yellow, and the yellow segment includes yellow and red segments). The color filter wheel is divided into 8 segments, namely red, green, blue, yellow, red, green, blue, and yellow. The color wheel including the 6-segment fluorescent wheel and the 8-segment color filter wheel is collectively referred to as the 8-segment color wheel.

[0053] Figure 4 It is a schematic diagram of the structure of a fluorescent wheel in a 4-segment color wheel. Figure 5 Schematic diagram of the structure of a color filter wheel in a 4-segment color wheel. Figure 4 and Figure 5 As shown, the rotation frequency of the 4-segment color wheel is 240 Hz, that is, 240 times per second, and 14,400 revolutions per minute. The fluorescent wheel of the 4-segment color wheel is divided into 3 segments: yellow, green, and transmission (yellow is synthesized from red and yellow, and the yellow segment includes yellow and red segments). The color filter wheel is divided into 4 segments: red, green, blue, and yellow. The color wheel including the 3-segment fluorescent wheel and the 4-segment color filter wheel is collectively referred to as a 4-segment color wheel.

[0054] For example, taking a blue laser as an example, Figure 6 FIG. 1 is a schematic diagram of the structure of a laser projection device based on monochrome laser projection technology. Figure 6 As shown, the laser projection device may include: a display panel, a TV panel, a galvanometer, a lens, a power supply panel and a laser control panel, a blue laser, a color wheel (including a fluorescent wheel and a color filter wheel), a light sensor corresponding to the fluorescent wheel, a light sensor corresponding to the color filter wheel, a color wheel driver, a microcontroller unit (MCU), and an electrically erasable programmable read only memory (EEPROM), etc. Among them, the above-mentioned TV panel may include a system on chip (SOC). The above-mentioned display panel may include a projection display control processing unit, a DMD chip, etc. Among them, the projection display control processing unit may include a DLP chip, etc.

[0055] The SOC main control chip transmits image data via Vbyone. The DLP image display module converts the Vbyone signal into a high-speed serial interface (HSSI) signal. The DMD's electro-optical conversion module converts the electrical signal into an optical signal, and the galvanometer vibrates the 60HZ signal into a 240HZ signal, which is projected onto the screen through the lens.

[0056] Laser driver circuit (such as Figure 6The power board + laser control board shown in the figure drives the blue laser to produce blue light, which is stimulated by the fluorescent wheel to produce green light and yellow light (blue light is transmitted). The green, yellow and blue light pass through the color filter wheel to produce yellow, green, blue and yellow four-color light (yellow can be filtered into red light). Red, green, blue and yellow. The first three colors are the primary colors for color development; yellow is used to brighten.

[0057] The parallel flash memory stores various setting data of the four-segment or eight-segment color wheel model, color wheel driving data, etc. DLP controls the laser driving the red, yellow, blue and green drivers on and off time (corresponding to the angle and Spoke of each color wheel, Spoke refers to the color mixing angle between two colors) through the Duty signal.

[0058] Based on Figure 6 The laser projection device shown, Figure 7 FIG. 1 is a flow chart of an existing color wheel control method. Figure 7 As shown, after the laser projection device is powered on, the DLP can read the color wheel driving frequency from the Flash (if the color wheel is an 8-segment color wheel, the color wheel driving frequency is 120HZ; if the color wheel is a 4-segment color wheel, the color wheel driving frequency is 240HZ), and control the color wheel driving through the serial peripheral interface (Serial Peripheral Interface, SPI) 1 and SPI2 respectively according to the color wheel driving frequency to drive the fluorescent wheel and the color filter wheel.

[0059] The light sensor detects the rotation frequency of the color wheel and feeds back the rotation frequency to the DLP through the LCK1 signal and the LCK2 signal. The MCU, EEPROM, and DLP can communicate through the I2C1 bus, such as transmitting and modifying the laser current value, color wheel model data, color wheel motor drive frequency, and controlling the MCU to transmit the DLP PWM frequency and other data to make the laser projection device emit light.

[0060] In existing laser projection devices, it is necessary to configure MCUs with different control logics, that is, different types of MCUs, for the laser projection device according to different types of color wheels. However, configuring different types of MCUs may make the on-site production of the laser projection device (for example, it is necessary to produce two different types of main control boards) and the maintenance of the laser projection device more difficult and less efficient.

[0061] Considering the above problems existing in the existing laser projection equipment, the present application proposes a laser projection equipment that is compatible with different types of color wheels, so as to improve the compatibility of the control device of the laser projection equipment with the color wheel type. Through the laser projection equipment, even if the laser projection equipment is configured with different types of color wheels, only one type of control device needs to be configured for the laser projection equipment, thereby improving the compatibility of the laser projection equipment with the color wheel type, thereby reducing the difficulty of on-site production and maintenance of the laser projection equipment, and improving the efficiency of production and maintenance of the laser projection equipment.

[0062] first, Figure 8 This is a schematic diagram of the structure of a laser projection device provided in this application. Figure 8 As shown, the laser projection device may include: a color wheel, a detection device, a digital light processing device, and a control device. The color wheel may be provided with N marks. The value of N may be related to the type of color wheel. For example, the number of marks provided on different types of color wheels may be different. N is an integer greater than or equal to 1.

[0063] Optionally, the color wheel may be a dual color wheel. Taking the dual color wheel as an example, the dual color wheel may include a first color wheel (e.g., the aforementioned color filter wheel) and a second color wheel (e.g., the aforementioned fluorescent wheel). Taking the dual color wheel as an example, N marks may be provided on both the first color wheel and the second color wheel.

[0064] Exemplarily, the above-mentioned mark can be, for example, a black color block. As a possible implementation, for any type of color wheel, taking N as an even number as an example, the N marks on the color wheel can be symmetrical in pairs. Exemplarily, taking N equal to 2 and the color wheel being a two-color wheel as an example, two marks can be symmetrically arranged on the first color wheel in the two-color wheel, and two marks can be symmetrically arranged on the second color wheel in the two-color wheel. Alternatively, when N is an even number, the N marks on the color wheel can also be asymmetric, and the present application is not limited by comparison. As another possible implementation, N can also be an odd number. Taking N equal to 1 and the color wheel being a two-color wheel as an example, 1 mark can be arranged on the first color wheel in the two-color wheel, and 1 mark can be arranged on the second color wheel in the two-color wheel.

[0065] The detection device can be used to detect the rotation frequency of the color wheel based on the N marks. Optionally, the detection device can be any detection device such as a light sensor that can detect the rotation frequency of the color wheel based on the marks on the color wheel, and the present application does not limit this.

[0066] The digital light processing device can be used to control the rotation of the color wheel according to a preset color wheel driving frequency. Optionally, the digital light processing device can be, for example, the aforementioned DLP. It should be understood that the present application does not limit the model of the DLP.

[0067] The control device is connected to the detection device. The control device can be any device with processing function such as MCU.

[0068] It should be understood that Figure 8 This application only takes the partial structure of the laser projection device involved in the present application as an example to illustrate the structure of the laser projection device. This application does not limit whether the laser projection device includes other components, and the connection relationship and connection method between the components.

[0069] Based on Figure 8 The laser projection device shown in the present application also provides a color wheel control method. The execution subject of the color wheel control method may include various devices in the laser projection device, such as a control device, a digital light processing device, etc., or the execution subject of the color wheel control method may be the laser projection device.

[0070] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0071] Fig. 9 Schematic diagram of a color wheel control method provided in an embodiment of the present application. Fig. 9 As shown, the method may include the following steps:

[0072] S101 . The digital light processing device controls the color wheel to rotate according to a preset color wheel driving frequency.

[0073] Optionally, the preset color wheel driving frequency may be pre-stored in the digital light processing device. Alternatively, taking the laser projection device as an example, which includes a Flash connected to the digital light processing device, the preset color wheel driving frequency may be stored in the Flash. The digital light processing device may read the preset color wheel driving frequency from the Flash after the laser projection device is powered on.

[0074] Optionally, the data optical processing device can be, for example, Figure 6 The color wheel driving device shown drives the color wheel to rotate according to the preset color wheel driving frequency. It should be understood that the implementation method of the digital light processing device controlling the color wheel rotation according to the preset color wheel driving frequency can refer to any existing method for controlling the color wheel rotation, and this application will not repeat it here.

[0075] S102: The detection device detects the rotation frequency of the color wheel based on the N marks.

[0076] Exemplarily, for each rotation of the color wheel, the detection device can detect N marks on the color wheel. The detection device can use the number of marks detected per second as the rotation frequency of the color wheel. For example, assuming that N is equal to 2, the detection device can detect 2 marks for each rotation of the color wheel. Assuming that the color wheel rotates 120 times per second, the detection device can detect 240 marks per second, and the rotation frequency of the color wheel is determined to be 240HZ. Assuming that N is equal to 1, the detection device can detect 1 mark for each rotation of the color wheel. Assuming that the color wheel rotates 120 times per second, the detection device can detect 120 marks per second, and the rotation frequency of the color wheel is determined to be 120HZ.

[0077] S103: The control device identifies the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device.

[0078] As a possible implementation, the control device may pre-store a mapping relationship between the rotation frequency of the color wheel and the type of the color wheel. The control device may determine the type of the color wheel based on the mapping relationship and the rotation frequency of the color wheel detected by the detection device. Exemplarily, the mapping relationship may be as shown in Table 1 below:

[0079] Table 1

[0080] Color wheel rotation frequency Types of Color Wheels Frequency 1 Type 1 Frequency 2 Type 2 … …

[0081] Taking the mapping relationship shown in Table 1 as an example, assuming that the rotation frequency of the color wheel detected by the detection device is frequency 1, the control device can determine that the type of the color wheel is type 1 according to the mapping relationship.

[0082] S104: The control device executes a color wheel control logic corresponding to the type of the color wheel.

[0083] It should be understood that the present application does not limit the above color wheel control logic. Optionally, the color wheel control logic can be any existing color wheel control logic.

[0084] As a possible implementation, the control device may be deployed with a mapping relationship between a color wheel type identifier and a color wheel control logic. The control device may determine the color wheel control logic corresponding to the type of the color wheel based on the type identifier of the color wheel and the mapping relationship between the type identifier of the color wheel and the color wheel control logic, and execute the color wheel control logic corresponding to the type of the color wheel.

[0085] In some embodiments, the control device may also read data corresponding to the type of the color wheel required for “executing the color wheel control logic corresponding to the type of the color wheel” from a storage device such as a flash or EEPROM of the laser projection device.

[0086] In some embodiments, the control device may also execute other control logic corresponding to the type of the color wheel. The other control logic may be control logic for controlling components other than the color wheel in the laser projection device.

[0087] In this embodiment, the number of marks set on the color wheel is related to the type of the color wheel, and the rotation frequency of the color wheel detected by the detection device is related to the number of marks set on the color wheel. Therefore, the control device can identify the type of the color wheel through the rotation frequency of the color wheel detected by the detection device, and execute the color wheel control logic corresponding to the type of the color wheel. Through the above method, the control device can identify different types of color wheels and execute the color wheel control logic corresponding to the type of the color wheel, thereby achieving compatibility with different types of color wheels. Through the laser projection device provided by the present application, even if the laser projection device is configured with different types of color wheels, only one type of control device needs to be configured for the laser projection device, thereby improving the compatibility of the laser projection device with the color wheel type, thereby reducing the difficulty of on-site production and maintenance of the laser projection device, and improving the efficiency of production and maintenance of the laser projection device.

[0088] Taking the above-mentioned N as an even number, the N marks are symmetrical on the color wheel, and the color wheel is a dual-color wheel as an example, as a possible implementation method, the control device can also perform synchronous control on the dual-color wheel. The dual-color wheel may include: a first color wheel and a second color wheel. The first color wheel and the second color wheel may both be provided with N marks.

[0089] In this implementation, the control device may also obtain a first sensing pulse signal output by the detection device "by detecting N marks on the first color wheel" and a second sensing pulse signal output by the detection device "by detecting N marks on the second color wheel". The first sensing pulse signal and the second sensing pulse signal are both periodic pulse signals. Then, the control device may synchronize the first sensing pulse signal and the second sensing pulse signal to synchronize the first color wheel and the second color wheel.

[0090] Among them, the N marks on the first color wheel and the N marks on the second color wheel can be respectively set at the positions corresponding to the first color wheel and the second color wheel. The above marks can rotate with the color wheel. As mentioned above, the first sensing pulse signal and the second sensing pulse signal can both be periodic pulse signals. The period of the periodic pulse signal can be 1 / N of the rotation period of the color wheel. In other words, 1 / N of the period of the periodic pulse signal is synchronized with the rotation period of the color wheel. The above N marks are the reference synchronization marks of the dual color wheel.

[0091] Exemplarily, the control device can, for example, compare the difference between the rising edge or falling edge of the first sensing pulse signal and the second sensing pulse signal at the same time within a rotation cycle, and adjust the rotation frequency of the first color wheel or the second color wheel so that the rising edge or falling edge of the first sensing pulse signal and the second sensing pulse signal coincide. By synchronizing the first sensing pulse signal and the second sensing pulse signal, the first color wheel and the second color wheel are indirectly synchronized.

[0092] In this embodiment, through the above method, the compatibility of the laser projection device with the color wheel type can be achieved while ensuring the synchronization of the dual color wheels, thereby improving the accuracy of the laser projection device in displaying images based on the dual color wheels.

[0093] Taking the case where the color wheel is of the first type or the second type, and where one mark is set on the first type of color wheel and two marks are set on the second type of color wheel as an example, the following describes in detail how the control device identifies the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device:

[0094] Wherein, the rated rotation frequency of the first type of color wheel is twice the rated rotation frequency of the second type of color wheel. For example, the rated rotation frequency of the first type of color wheel may be 240 Hz, such as the aforementioned 4-segment color wheel. Exemplarily, the rated rotation frequency of the second type of color wheel may be 120 Hz, such as the aforementioned 4-segment color wheel. The aforementioned preset color wheel drive frequency may be equal to the rated rotation frequency of the second type of color wheel.

[0095] As a possible implementation, if the rotation frequency of the color wheel detected by the detection device is equal to the preset color wheel driving frequency, it means that the detection device can detect one mark for each rotation of the color wheel, that is, there is one mark on the color wheel. Then the control device can determine that the type of the color wheel is the first type.

[0096] If the rotation frequency of the color wheel detected by the detection device is twice the preset color wheel driving frequency, it means that the detection device can detect two marks for each rotation of the color wheel, that is, there are two marks on the color wheel. Then the control device can determine that the type of the color wheel is the second type.

[0097] Through the above method, the detection device can determine the type of color wheel based on the relationship between the rotation frequency of the color wheel and the preset color wheel driving frequency, laying the foundation for the laser projection device to be compatible with different types of color wheels.

[0098] The following is a detailed description of how the control device executes the color wheel control logic corresponding to the type of color wheel:

[0099] In some embodiments, if the type of the color wheel is the first type, the control device may send a first indication message to the digital light processing device. The first indication message may be used to instruct the digital light processing device to modify the preset color wheel drive frequency to the target color wheel drive frequency, so that the digital light processing device controls the color wheel to rotate according to the target color wheel drive frequency. The target color wheel drive frequency is twice the preset color wheel drive frequency. The target color wheel drive frequency may be the rated rotation frequency of the first type color wheel.

[0100] If the type of the color wheel is the second type, optionally, the control device may not send the indication information to the digital light processing device. Alternatively, the control device may send the second indication information to the digital light processing device. The second indication information may be used to instruct the digital light processing device to control the rotation of the color wheel according to a preset color wheel drive frequency. The preset color wheel drive frequency may be the rated rotation frequency of the second type color wheel. Exemplarily, the control device may send the first indication information or the second indication information to the above-mentioned digital light processing device, for example, through different PWM signals. That is, the PWM signals corresponding to the first indication information and the second indication information are different.

[0101] Through the above method, the control device can send different instruction information to the digital light processing device for different types of color wheels, so that the digital light processing device drives the color wheel to rotate according to the rated rotation frequency of each type of color wheel, thereby achieving compatibility with different types of color wheels.

[0102] In some embodiments, after the digital light processing device controls the color wheel to rotate according to the target color wheel driving frequency or controls the color wheel to rotate according to the preset color wheel driving frequency, it can also obtain the rotation frequency of the color wheel detected by the detection device.

[0103] Then, the digital light processing device may obtain a color wheel verification result for indicating whether the rotation frequency of the color wheel is the same as the target color wheel driving frequency, and send the result to the control device.

[0104] For example, if the first type of color wheel is a 240HZ color wheel and the second type of color wheel is a 120HZ color wheel, if the color wheel is the first type of color wheel, the digital light processing device can control the color wheel to rotate according to the color wheel driving frequency of 240HZ. Then, the digital light processing device can determine whether the rotation frequency of the color wheel detected by the detection device is equal to 240HZ, and obtain the color wheel verification result and send it to the control device.

[0105] If the color wheel is a second type color wheel, the digital light processing device can control the color wheel to rotate according to the color wheel driving frequency of 120 Hz. Then, the digital light processing device can determine whether the rotation frequency of the color wheel detected by the detection device is equal to 240 Hz, and obtain the color wheel verification result and send it to the control device.

[0106] The control device can also receive the color wheel verification result. If the color wheel verification result is used to characterize that the rotation frequency of the color wheel is different from the target color wheel driving frequency, it means that the color wheel may be abnormal, which may cause the laser projection device to be unable to perform laser projection display. Then the control device can, for example, trigger the shutdown process of the laser projection device to shut down the laser projection device. Alternatively, in some embodiments, when the color wheel verification result is used to characterize that the rotation frequency of the color wheel is different from the target color wheel driving frequency, the control device can also control the laser projection device to output a prompt message to prompt the user that the laser projection device has an abnormality, etc., to improve the user experience.

[0107] If the color wheel verification result is used to indicate that the rotation frequency of the color wheel is the same as the target color wheel driving frequency, it means that the color wheel is normal. Optionally, the control device can also control the laser projection device to perform projection display according to any existing laser projection display mode.

[0108] Still taking the above-mentioned first type of color wheel as a 240HZ color wheel and the second type of color wheel as a 120HZ color wheel as an example, assuming that the color wheel is the first type of color wheel and there is a mark on the first type of color wheel, when the rotation frequency of the color wheel is the same as the target color wheel drive frequency, it means that the color wheel rotates according to the target color wheel drive frequency, that is, there is no abnormality in the color wheel. If they are different, it means that there is an abnormality in the color wheel. Assuming that the color wheel is the second type of color wheel and there are 2 marks on the second type of color wheel, when the rotation frequency of the color wheel is the same as the target color wheel drive frequency, it means that the color wheel rotates according to 1 / 2 of the target color wheel drive frequency, that is, the preset color wheel drive frequency, so it also means that there is no abnormality in the color wheel. If they are different, it means that there is an abnormality in the color wheel.

[0109] As another possible implementation, if the type of the color wheel is the second type, the control device may also obtain the rotation frequency of the color wheel detected by the detection device, and send the 1 / 2 times rotation frequency of the color wheel to the digital light processing device, so that the digital light processing device obtains a color wheel verification result for characterizing whether the 1 / 2 times rotation frequency of the color wheel is the same as the aforementioned preset color wheel driving frequency based on the 1 / 2 times rotation frequency of the color wheel. Then, the digital light processing device may send the color wheel verification result for characterizing whether the 1 / 2 times rotation frequency of the color wheel is the same as the aforementioned preset color wheel driving frequency to the control device.

[0110] The control device may receive the color wheel verification result. Then, the control device may trigger the shutdown process of the laser projection device when the color wheel verification result is used to indicate that the rotation frequency of the 1 / 2 color wheel is different from the aforementioned preset color wheel driving frequency. The control device may control the laser projection device to perform projection display according to any existing laser projection display mode when the color wheel verification result is used to indicate that the rotation frequency of the 1 / 2 color wheel is the same as the aforementioned preset color wheel driving frequency.

[0111] Through the above method, the laser projection device can perform self-check on whether the color wheel rotates normally, and shut down when it is determined that there is an abnormality in the color wheel, thereby avoiding damage to the laser projection device during continued operation and ensuring the safety and service life of the laser projection device components.

[0112] Taking the above-mentioned data optical processing device as DLP, the control device as MCU, and the detection device as optical sensor as an example, Fig.10 This is a schematic diagram of the structure of another laser projection device provided by this application. Fig.10 As shown, the light sensor corresponding to the dual-color wheel can be connected to the MCU, and the rotation frequency of the dual-color wheel is transmitted through the LCK1 signal and the LCK2 signal. The MCU can control the DLP through the PWM signal. Taking the fluorescent wheel and the color filter wheel as a 120HZ color wheel as an example, the back of the fluorescent wheel and the color filter wheel can be provided with 2 marks (for example, two black blocks). Taking the fluorescent wheel and the color filter wheel as a 240HZ color wheel as an example, the back of the fluorescent wheel and the color filter wheel can be provided with 1 mark (for example, 1 black block).

[0113] Based on Fig.10 The laser projection device shown, Fig.11 This is a flow chart of another color wheel control method provided by this application. Fig.11 As shown, DLP sends a color wheel drive of 120HZ by default. When MCU detects 240HZ, the MCU recognizes an 8-segment color wheel, cuts the frequency in half, and outputs a PWM signal representing 120HZ to DLP (MCU recognizes an 8-segment color wheel, and the MCU output frequency is cut in half). When MCU detects 120HZ, the MCU recognizes a 4-segment color wheel, and the MCU outputs a 120HZ signal, and at the same time notifies DLP to send a 240HZ drive, and the MCU outputs a PWM signal representing 240HZ to DLP (MCU recognizes a 4-segment color wheel, and the MCU output frequency is not cut in half).

[0114] The motor drive in the parallel Flash of the DLP can simultaneously set the 120HZ and 240HZ motor drive timings; the color wheel model data can simultaneously set the 8-segment color wheel model (120HZ) and 4-segment color wheel model (240HZ) data.

[0115] like Fig.10 and11 As shown in the figure, taking the 8-segment color wheel installed on the laser projection device as an example, when the device is powered on, the system first runs the 8-segment color wheel model (120HZ) according to the default 120HZ program, and the MCU receives LCK1 and LCK2 and detects the 240HZ LCK signal at the same time, and recognizes the 8-segment color wheel 120HZ. The MCU reduces the frequency by half (MCU recognizes the 8-segment color wheel, and the MCU output frequency is reduced by half), and sends the 120HZ frequency to the DLP through PWM1 and PWM2. The system points the light and outputs the image normally.

[0116] like Fig.10 and 11 As shown in the figure, taking the 4-segment color wheel installed on the laser projection device as an example, when the device is powered on, the system first runs the 8-segment color wheel model (120HZ) according to the default 120HZ program. The MCU receives LCK1 and LCK2 and detects the 120HZ LCK signal at the same time, and recognizes the 4-segment color wheel 240HZ. The MCU modifies the 4-segment color wheel model (240HZ) data and the motor 240HZ data through I2C and resets the DLP. The DLP re-drives the color wheel according to the 4-segment color wheel model (240HZ) data. The MCU receives LCK1 and LCK12 and detects the LCK signal indicating 240HZ at the same time. The MCU frequency is not halved (the MCU recognizes the 4-segment color wheel, and the MCU output frequency is not halved). The 240HZ frequency is sent to the DLP through PWM1 and PWM2, and the system points out the light normally.

[0117] Fig.12 Schematic diagram of the structure of a color wheel control device provided in an embodiment of the present application. The device can be used as a control device for a laser projection device described in any of the above embodiments. Fig.12 As shown, the device may include: an identification module 21 and an execution module 22.

[0118] The identification module 21 is used to identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device, wherein the rotation frequency of the color wheel is detected by the detection device based on the N marks.

[0119] The execution module 22 is used to execute the color wheel control logic corresponding to the type of the color wheel.

[0120] Taking the color wheel as a dual-color wheel, the dual-color wheel includes: a first color wheel and a second color wheel, and the first color wheel and the second color wheel are both provided with the N marks as an example, optionally, the execution module 22 is also used to obtain the first induction pulse signal output by the detection device detecting the N marks on the first color wheel, and the second induction pulse signal output by detecting the N marks on the second color wheel; synchronize the first induction pulse signal and the second induction pulse signal to synchronize the first color wheel and the second color wheel. Wherein, the first induction pulse signal and the second induction pulse signal are both periodic pulse signals.

[0121] Taking the example that the type of the color wheel is the first type or the second type; the rated rotation frequency of the color wheel of the first type is twice the rated rotation frequency of the color wheel of the second type; the preset color wheel drive frequency is equal to the rated rotation frequency of the color wheel of the second type; the color wheel of the first type is provided with one mark and the color wheel of the second type is provided with two marks, optionally, the identification module 21 is specifically used to determine that the type of the color wheel is the first type when the rotation frequency of the color wheel detected by the detection device is equal to the preset color wheel drive frequency; and determine that the type of the color wheel is the second type when the rotation frequency of the color wheel detected by the detection device is twice the preset color wheel drive frequency.

[0122] Optionally, the execution module 22 is specifically configured to send a first indication message to the digital light processing device when the type of the color wheel is the first type. The first indication message is used to instruct the digital light processing device to modify the preset color wheel driving frequency to a target color wheel driving frequency, so that the digital light processing device controls the color wheel to rotate according to the target color wheel driving frequency; the target color wheel driving frequency is twice the preset color wheel driving frequency.

[0123] If the type of the color wheel is the second type, optionally, the execution module 22 is also used to obtain the rotation frequency of the color wheel detected by the detection device; send 1 / 2 times the rotation frequency of the color wheel to the digital light processing device, so that the digital light processing device obtains a color wheel verification result for characterizing whether the 1 / 2 times the rotation frequency of the color wheel is the same as the preset color wheel driving frequency based on the 1 / 2 times the rotation frequency of the color wheel; receive the color wheel verification result; and trigger the shutdown process of the laser projection device when the color wheel verification result is used to characterize that the 1 / 2 times the rotation frequency of the color wheel is different from the preset color wheel driving frequency.

[0124] The color wheel control device provided in the embodiment of the present application can execute the color wheel control method in the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

[0125] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0126] The present application also provides a program product, which includes an execution instruction, which is stored in a readable storage medium. At least one control module of the display device can read the execution instruction from the readable storage medium, and at least one control module executes the execution instruction so that the display device implements the color wheel control method provided by the various embodiments described above.

[0127] 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.

[0128] For the convenience 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 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: The laser projection device comprises: a color wheel, a detection device, a digital light processing device, and a control device; N marks are arranged on the color wheel; the value of N is related to the type of the color wheel; N is an integer greater than or equal to 1; The digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency; The detection device is used to detect the rotation frequency of the color wheel based on the N marks; The control device connected to the detection device is configured to: identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device; Execute the color wheel control logic corresponding to the type of the color wheel.

2. The laser projection device according to claim 1, characterized in that: N is an even number, and the N marks are symmetrical in pairs on the color wheel.

3. The laser projection device according to claim 2, characterized in that: The color wheel is a dual color wheel, comprising: a first color wheel and a second color wheel, the first color wheel and the second color wheel are both provided with the N marks, and the control device is further configured as follows: Acquire a first induction pulse signal output by the detection device when detecting the N marks on the first color wheel, and detect a second induction pulse signal output by the N marks on the second color wheel; the first induction pulse signal and the second induction pulse signal are both periodic pulse signals; The first sensing pulse signal and the second sensing pulse signal are synchronized to synchronize the first color wheel and the second color wheel.

4. The laser projection device according to any one of claims 1 to 3, characterized in that: The type of the color wheel is the first type or the second type; the rated rotation frequency of the color wheel of the first type is twice the rated rotation frequency of the color wheel of the second type; the preset color wheel driving frequency is equal to the rated rotation frequency of the color wheel of the second type; the color wheel of the first type is provided with one of the marks, and the color wheel of the second type is provided with two of the marks; The step of identifying the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device comprises: If the rotation frequency of the color wheel detected by the detection device is equal to the preset color wheel driving frequency, determining that the type of the color wheel is the first type; If the rotation frequency of the color wheel detected by the detection device is twice the preset color wheel driving frequency, it is determined that the type of the color wheel is the second type.

5. The laser projection device according to claim 4, characterized in that: The color wheel control logic corresponding to the type of the color wheel is executed, including: If the type of the color wheel is the first type, a first indication message is sent to the digital light processing device, wherein the first indication message is used to instruct the digital light processing device to modify the preset color wheel driving frequency to a target color wheel driving frequency, so that the digital light processing device controls the rotation of the color wheel according to the target color wheel driving frequency; the target color wheel driving frequency is twice the preset color wheel driving frequency.

6. The laser projection device according to claim 4, characterized in that: If the type of the color wheel is the second type, the control device is further configured to: Acquire the rotation frequency of the color wheel detected by the detection device; send 1 / 2 times the rotation frequency of the color wheel to the digital light processing device, so that the digital light processing device obtains a color wheel verification result for indicating whether the 1 / 2 times the rotation frequency of the color wheel is the same as the preset color wheel driving frequency according to the 1 / 2 times the rotation frequency of the color wheel; Receiving the color wheel calibration result; When the color wheel verification result is used to indicate that the rotation frequency of the 1 / 2 color wheel is different from the preset color wheel driving frequency, a shutdown process of the laser projection device is triggered.

7. A color wheel control method, characterized in that: The laser projection device comprises: a color wheel, a detection device, a digital light processing device, and a control device; the color wheel is provided with N marks; the value of N is related to the type of the color wheel; N is an integer greater than or equal to 1; the digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency; the method is applied to the control device, and the method comprises: Identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device; the rotation frequency of the color wheel is detected by the detection device based on the N marks; Execute the color wheel control logic corresponding to the type of the color wheel.

8. A color wheel control device, characterized in that: The laser projection device comprises: a color wheel, a detection device, a digital light processing device, and a control device; the color wheel is provided with N marks; the value of N is related to the type of the color wheel; N is an integer greater than or equal to 1; the digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency; the color wheel control device is applied to the control device, and the color wheel control device comprises: an identification module, configured to identify the type of the color wheel according to the rotation frequency of the color wheel detected by the detection device; the rotation frequency of the color wheel is detected by the detection device based on the N marks; The execution module is used to execute the color wheel control logic corresponding to the type of the color wheel.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method of claim 7 is implemented.

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method of claim 7 when being executed by a processor.

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