Projection device

Abstract

According to the projection equipment provided by the embodiment of the invention, when the projection equipment displays an image, a main control circuit outputs a light-emitting enable signal to control a light source to emit light, and outputs a video signal to control a display control circuit to obtain a first control signal from a light valve driving circuit; the color wheel control circuit outputs a color wheel control signal and a light machine control signal to control the color wheel drive circuit to rotate based on the color wheel control signal and adjust light emitted by the light source into a target color light beam corresponding to the video signal, and the light valve drive circuit controls the light valve to modulate the target color light beam based on the light machine control signal. Because the first control signal is the signal generated based on the signal obtained in the optical engine assembling stage, the display correspondence of the light valve and the color wheel does not need to be repeatedly adjusted after the display control circuit is installed. And the difficulty and the complexity of adjusting the corresponding display of the color matching wheel and the light valve by the display control unit are reduced.

Description

Technical Field

[0001] This application relates to display technology. More specifically, it relates to a projection device. Background Technology

[0002] Currently, in the process of displaying the image to be projected, projection equipment controls the output of a laser from a light source. This blue laser then passes through a phosphor wheel and a color filter wheel to output different colored light sources. These light sources are then dimmed by a Digital Micromirror Device (DMD), and the beam is projected through a projection lens onto the projection screen to display the corresponding image. To ensure display accuracy, the position of the color wheel and the DMD need to be adjusted by the display control unit to ensure the correspondence between the display beam and the displayed image for each frame.

[0003] The adjustment process of the color wheel and DMD is cumbersome, which makes it difficult for the display control unit to adjust the corresponding display of the color wheel and DMD. Summary of the Invention

[0004] This application provides a projection device aimed at solving at least one of the above-mentioned technical problems.

[0005] This application provides a projection device, including:

[0006] The light source is configured to emit a monochromatic laser beam;

[0007] The color wheel is configured to emit lasers of multiple colors along different optical paths after being irradiated by the laser beam;

[0008] A light valve is configured to modulate the colored light beam emitted by the color wheel and project an image beam to the projection lens;

[0009] The projection lens is configured to image the incident laser beam.

[0010] The projection device also includes a main control circuit, a light valve drive circuit, a display control circuit, and a color wheel drive circuit;

[0011] The main control circuit is configured to output video signals and light-emitting enable signals;

[0012] The light source is electrically connected to the main control circuit and is configured to emit light based on the light emission enable signal;

[0013] The light valve driving circuit is configured to provide a first control signal; the first control signal is a signal generated based on a signal obtained during the optical engine assembly stage.

[0014] The display control circuit is electrically connected to the main control circuit and the light valve drive circuit, and is configured to output a color wheel control signal and an optomechanical control signal based on the video signal and the first control signal.

[0015] The color wheel drive circuit and the display control circuit are electrically connected to the color wheel and are configured to control the rotation of the color wheel based on the color wheel control signal, so that the light emitted by the light source passes through the color wheel and outputs the target color beam corresponding to the video signal;

[0016] The light valve driving circuit is electrically connected to the light valve and is also configured to control the light valve to modulate the target color beam based on the optomechanical control signal, thereby generating a projected image corresponding to the video signal.

[0017] In the above technical solution, when the projection device displays an image, the main control circuit outputs a video signal and a light emission enable signal. The light source emits light based on the light emission enable signal. When the display control circuit obtains the video signal, it obtains a first control signal from the light valve drive circuit. Based on the video signal and the light emission adjustment signal, it outputs a color wheel control signal and an optomechanical control signal to control the color wheel drive circuit to rotate the color wheel based on the color wheel control signal, adjusting the light emitted by the light source to the target color beam corresponding to the video signal. The light valve drive circuit controls the light valve to modulate the target color beam based on the optomechanical control signal, generating the projected image corresponding to the video signal. Since the first control signal is a signal generated based on the signal obtained during the optical engine assembly stage, the display control circuit does not need to repeatedly adjust the display correspondence between the light valve and the color wheel after installation, reducing the difficulty and complexity of the display control unit in adjusting the corresponding display of the color wheel and the light valve.

[0018] In some feasible embodiments, the light valve driving circuit is provided with a first communication interface;

[0019] The display control circuit is electrically connected to the first communication port, and the display control circuit is configured to receive the first control signal from the first communication interface based on a preset communication protocol.

[0020] A color indication signal is generated based on the video signal;

[0021] Based on the color indication signal and the first control signal, the color wheel control signal is sent to the color wheel drive circuit, and the optomechanical control signal is sent to the first communication interface.

[0022] In some feasible embodiments, the color wheel is provided with a marker to indicate the color calibration position of the color wheel;

[0023] The color wheel is equipped with a corresponding sensor, which is configured to output a sampling signal, the sampling signal being used to indicate the position of the color wheel's rotation.

[0024] The display control circuit and the sensor are electrically connected and configured to obtain a first control signal from the first communication interface through the third communication interface based on the preset communication protocol.

[0025] Based on the sampling signal and the first control signal, the color wheel control signal is output;

[0026] The color wheel drive circuit is configured to adjust the rotational speed of the color wheel based on the color wheel control signal.

[0027] In the above technical solution, the display control circuit is provided with a third communication interface, and the light valve drive circuit is provided with a first communication interface. Both of the above communication interfaces support data transmission of preset communication protocols. The third communication interface is the original communication interface of the display control circuit, and the first communication interface is the original communication interface of the light valve drive circuit. Therefore, the above circuit structure does not significantly modify the circuit structure of the projection equipment, and can improve the production efficiency of the projection equipment while slightly increasing the modification cost of the projection equipment production line.

[0028] In some feasible embodiments, the color wheel is marked, and during the optical engine assembly stage, the color wheel drive unit, the sensor, the main control circuit and the tooling fixture plate are electrically connected. The tooling fixture plate is provided with a second communication interface, and the second communication interface is electrically connected to the first communication interface of the light valve drive circuit.

[0029] The tooling fixture board is configured to obtain the test video signal provided by the main control circuit;

[0030] Based on the test video signal, a test color indication signal is generated;

[0031] Based on the color indication signal, output a color wheel adjustment signal;

[0032] The color wheel drive circuit and the tooling fixture are electrically connected and configured to control the rotation of the color wheel to a target position based on the color wheel adjustment signal. The target position is the position reached by the color wheel after the sensor detects the relative rotation parameters of the color calibration position. The target position is the test color corresponding to the test color indication signal.

[0033] A second control signal is constructed based on the relative parameters;

[0034] Based on the preset communication protocol, the second control signal is sent to the first communication interface through the second communication interface, so that when the light valve driving circuit and the display control circuit are electrically connected, the first control signal is sent to the display control circuit.

[0035] In the above technical solution, during the optical engine assembly stage of the projection device, the display control circuit is not yet connected to the light source, color wheel drive circuit, light valve drive circuit, and other circuit structures. A fixture board is needed to replace the display control circuit to debug the display correspondence between the color wheel and the light valve. Since the fixture board is equipped with a second communication interface, which can transmit information with the first communication interface of the light valve drive circuit based on a preset communication protocol, the fixture board outputs a second control signal after debugging. After the optical engine assembly stage is completed, even if the fixture board is disconnected from other circuit structures, the light valve drive circuit and the display control circuit still send a first control signal to the display control circuit when they are electrically connected to regulate the corresponding display of the light valve and the color wheel. This eliminates the need to debug the correspondence between the light valve and the color wheel again after the display control circuit is installed, thus improving the installation and testing efficiency of the projection device.

[0036] In the projection device provided in this application embodiment, when the projection device displays an image, the main control circuit outputs a video signal and a light emission enable signal. The light source emits light based on the light emission enable signal. When the display control circuit obtains the video signal, it obtains a first control signal from the light valve drive circuit. Based on the video signal and the light emission adjustment signal, it outputs a color wheel control signal and an optomechanical control signal to control the color wheel drive circuit to rotate the color wheel based on the color wheel control signal, adjusting the light emitted by the light source to the target color beam corresponding to the video signal. The light valve drive circuit controls the light valve to modulate the target color beam based on the optomechanical control signal, generating a projected image corresponding to the video signal. Since the first control signal is a signal generated based on the signal obtained during the optical engine assembly stage, the display control circuit does not need to repeatedly adjust the display correspondence between the light valve and the color wheel after installation, reducing the difficulty and complexity of the display control unit adjusting the corresponding display of the color wheel and the light valve. Attached Figure Description

[0037] To more clearly illustrate the implementation methods in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0038] Figure 1 This is an application scenario diagram of a projection device according to some embodiments;

[0039] Figure 2 This is a schematic diagram of the structure of a laser projection device according to some embodiments;

[0040] Figure 3A This is a schematic diagram illustrating the principle of laser light source and color wheel emitting light according to some embodiments;

[0041] Figure 3BThis is a structural diagram of a fluorescent wheel according to some embodiments;

[0042] Figure 3C This is a structural diagram of a color filter wheel according to some embodiments;

[0043] Figure 4 This is a sampling schematic diagram of a color wheel sensor according to some embodiments;

[0044] Figure 5 This is a schematic diagram of the structure of a laser projection device according to some embodiments;

[0045] Figure 6 This is a schematic diagram of the structure of a laser projection device according to some other embodiments;

[0046] Figure 7 This is a schematic diagram of the structure of a laser projection device according to some other embodiments;

[0047] Figure 8 This is a schematic diagram of the structure of a coaxial color wheel according to some other embodiments.

[0048] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0049] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0050] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment. It should be further understood that the terms "comprising" or "including" indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups.

[0051] In the description of this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise expressly specified. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition occur only when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0052] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0053] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0054] Figure 1 This is an application scenario diagram of a laser projection system provided in this application according to an exemplary embodiment, such as... Figure 1As shown, the user can operate the laser projection device 10 through the smart device 1003 or the control device 1005 to project images or videos onto the screen 1000.

[0055] In some embodiments, the number of laser projection devices 10 may be multiple. When the laser projection system projects a projection image on the screen 1000, each laser projection device 10 projects a portion of the projection image on the screen 1000 and sets an overlapping area in two adjacent images to display the same image, so as to achieve image connection. By splicing multiple projection images on the screen 1000, a complete projection image is formed.

[0056] In some embodiments, the control device 1005 may be a remote control. Communication between the remote control and the laser projection device 10 includes infrared protocol communication, Bluetooth protocol communication, and other short-range communication methods, controlling the laser projection device 10 wirelessly or via wired means. Users can input user commands through buttons on the remote control, voice input, control panel input, etc., to control the laser projection device 10.

[0057] In some embodiments, a smart device 1003 (such as a mobile terminal, tablet computer, computer, laptop computer, etc.) can also be used to control the laser projection device 10. For example, an application running on the smart device can be used to control the laser projection device 10.

[0058] In some embodiments, the laser projection device 10 may receive instructions not through the aforementioned smart device or control device, but through gestures or the like.

[0059] In some embodiments, the laser projection device 10 can also be controlled in ways other than the control device 1005 and the smart device 1003. For example, it can be controlled by directly receiving the user's voice commands through a module configured inside the laser projection device 10 for acquiring voice commands, or it can be controlled by receiving the user's voice commands through a voice control device set outside the laser projection device 10.

[0060] In some embodiments, the laser projection device 10 also communicates with the server 1004. The laser projection device 10 may communicate via a local area network (LAN), wireless local area network (WLAN), and other networks. The server 1004 may provide various content and interactive features to the laser projection device 10. The server 1004 may be a cluster or multiple clusters, and may include one or more types of servers.

[0061] Figure 2 This is a schematic diagram of the structure of a laser projection device according to some embodiments, such as Figure 2As shown, the laser projection device includes a main control circuit, which is configured to obtain the video signal to be projected, analyze the video signal, and output the analyzed signal.

[0062] In some embodiments, the laser projection device may include a display control circuit and a main control circuit electrically connected, configured to output a color indication signal, a color wheel control signal, and an optomechanical control signal based on the resolution signal.

[0063] In some embodiments, the laser projection device includes a light source, and the light source and display control circuitry are electrically connected and configured to drive the light source to emit a laser beam based on a color indication signal.

[0064] In some embodiments, the laser projection device includes a color wheel drive unit and a corresponding color wheel. The color wheel includes a color filter wheel and a phosphor wheel. The color wheel drive unit is electrically connected to a display control circuit and is configured to control the rotation of the color filter wheel and the phosphor wheel based on a color wheel control signal, so that the laser beam provided by the light source passes through the phosphor wheel and the color filter wheel to output light of the color corresponding to the current video.

[0065] In some embodiments, the laser projection device includes a light valve driving circuit, which is electrically connected to a display control circuit. It is configured to adjust the flip angle of each light mirror based on an optomechanical control signal so that the light beam provided by the color wheel is projected onto the light mirror. The light beam is adjusted by reflection, and the light beam passing through the projection lens is projected onto the screen to display the projected image.

[0066] For example, Figure 3A This application provides a schematic diagram of a laser light source that emits light in conjunction with a fluorescent wheel and a color filter wheel. Figure 3B This is a schematic diagram of the fluorescent wheel. Figure 3C This is a schematic diagram of the color filter wheel. The following section combines... Figure 3A , Figure 3B and Figure 3C This paper introduces the principle of how laser light sources work together with phosphor wheels and color filters to output primary color light.

[0067] Reference Figure 3A It includes a laser light source 601, a first focusing lens 602, a dichroic mirror 603, a phosphor wheel 604, a reflector 605, a second focusing lens 606, a color filter wheel 607, a light guide 608, a total reflection prism 609, a light valve 610, and a projection lens 611.

[0068] The phosphor wheel 604 may include a plurality of first sub-regions, the number of which is related to the number of primary colors, and each primary color may correspond to at least one first sub-region on the phosphor wheel 604. Specifically, after receiving a light beam emitted by the light source 601, the at least one first sub-region on the phosphor wheel 604 corresponding to each primary color is capable of outputting a light beam for generating that primary color. (Reference) Figure 3B The fluorescent wheel 604 has multiple first sub-regions, including a yellow fluorescent region 6041, a green fluorescent region 6042, and a transparent region 6043.

[0069] The color filter wheel 607 may also include multiple second sub-regions, the number of which corresponds to the number of first sub-regions on the phosphor wheel 604, to generate beams of different colors. (Reference) Figure 3C The color filter wheel 607 includes multiple second sub-regions, including a red transmission area 6071, a yellow transmission area 6072, a transparent area 6073, and a green transmission area 6074.

[0070] The optical path that emits blue light ( Figure 3A (Indicated by thick solid arrows): Using a blue laser light source as a monochromatic laser light source, the light is reflected by one side of the dichroic mirror 603, passes through the transparent area 6043 on the phosphor wheel 604, is reflected by three mirrors 605, and is reflected by the other side of the dichroic mirror 603 before reaching the second focusing lens 606; after passing through the focusing lens 606, the light is still blue after passing through the transparent area of ​​the filter color wheel 607.

[0071] The optical path that emits green light ( Figure 3A (Indicated by long dashed arrows): A blue laser light source is used as a monochromatic laser light source. After being reflected by one side of the dichroic mirror 603, it illuminates the green fluorescent area 6042 on the phosphor wheel 604, producing green fluorescence. The green fluorescence passes directly through the dichroic mirror 603 and reaches the second focusing lens 606. After passing through the focusing lens 606, it is purified by the green transmission area 6074 of the filter color wheel 607 and outputs green light.

[0072] The optical path that emits yellow light ( Figure 3A (Indicated by a short dashed arrow): A blue laser light source is used as a monochromatic laser light source. After being reflected by one side of the dichroic mirror 603, it shines on the yellow fluorescent area 6041 on the fluorescent wheel 604, producing yellow fluorescence. The yellow fluorescence passes directly through the dichroic mirror 603 and reaches the second focusing lens 606. After passing through the focusing lens 606, part of the yellow fluorescence passes through the red transmission area 6071 of the filter color wheel 607 and outputs red light; part of it passes through the yellow transmission area 6072 of the filter color wheel 607 and outputs yellow light.

[0073] by Figure 3B Taking the color zone division on the fluorescent wheel 604 as an example, when the fluorescent wheel 604 rotates counterclockwise, it can sequentially generate yellow fluorescence, green fluorescence, and blue laser light. Figure 3CTaking the color zone division on the color filter wheel 607 as an example, when the color filter wheel 607 rotates counterclockwise, and in conjunction with the aforementioned fluorescent wheel 604 rotates counterclockwise, the final output light color sequence can be red, green, blue, and yellow. Among them, red, green, and blue are used to present the projected image, and yellow is used to increase the brightness of the image, so as to realize the replacement of the three-color LED light source with a four-primary-color light source using a monochromatic laser eight-segment color wheel.

[0074] Furthermore, the timing of the output light color is related to the color zone distribution on the two color wheels, and the initial output light color is related to the starting point of the rotation of the two color wheels. This application does not limit the timing of the output light color; in practical applications, it must be matched with the timing of the color requirements of the video signal being analyzed by the front end.

[0075] Afterwards, the output light color is homogenized by the light guide 608; the homogenized light undergoes total internal reflection on the total internal reflection prism 609 and illuminates the light valve 610, which then reflects the light into the projection lens 611 to project the image.

[0076] To ensure the accuracy of the target color display, the fluorescent wheel 604, the color filter wheel 607, and the light source 601 need to work together. The correspondence between the regions constructed by the rotation of the fluorescent wheel 604 and the color filter wheel 607, as well as the emission of the laser, need to be guaranteed.

[0077] The laser projection device is equipped with a first sensor and a second sensor corresponding to the fluorescent wheel 604 and the color filter wheel 607, respectively; the fluorescent wheel 604 is equipped with a first marker; and the color filter wheel 607 is equipped with a second marker. This marker usually has two functions: first, it is used to detect the rotation speed of the color wheel; second, the position of the marker is usually aligned with the color partition of the color wheel, and the system can determine the initial time of a certain color by the arrival of the marker signal pulse.

[0078] refer to Figure 4 The sensor structure shown is explained below, along with its operation. The sensor includes a light-emitting transistor (LED) and a phototransistor. The LED provides a light signal, which is reflected by a light-reflecting surface based on its reflection characteristics and projected onto the phototransistor. The phototransistor controls its conduction state based on the light intensity, thereby adjusting the voltage value at its output terminal (the collector of the transistor in the figure).

[0079] For example, in a projection system, a marker can be detected by an infrared sensor. Using a black label as the marker, the low reflectivity of the black label absorbs infrared detection light. The surfaces other than the black label are either highly reflective metallic surfaces or areas that allow light to pass through. The infrared sensor generates a pulse signal based on the presence or absence of reflected light. This pulse signal is periodic; therefore, by detecting the frequency of the pulses, it is possible to monitor the motor speed and the color wheel's color partition position.

[0080] In practical applications, labels may have errors. These errors can cause the two color wheels to not reach the same preset color boundary at the same time. This means that the two color wheels are misaligned. (Misalignment means that even if the initial labels are pasted to the same color boundary, due to pasting errors, the color boundaries of the two color wheels are not completely aligned at the same time, resulting in color mixing.)

[0081] Therefore, the micro-projection system needs to be tested and debugged. However, the adjustment process of the color wheel and light valve is cumbersome, which makes it difficult for the display control unit to adjust the color wheel and light valve accordingly.

[0082] The focus of research has become how to reduce the time required for adjusting the color wheel and light valve in the production process of projection equipment, and how to reduce the difficulty of adjusting the color wheel and light valve in a corresponding display.

[0083] To address the aforementioned technical problems, this application provides a projection device. The technical concept of this application is as follows: When the projection device displays an image, the main control circuit outputs a light emission enable signal to control the light source to emit light, and also outputs a video signal to control the display control circuit to obtain a first control signal from the light valve drive circuit. Based on the video signal and the light emission adjustment signal, the display control circuit outputs a color wheel control signal and an optomechanical control signal to control the color wheel drive circuit to rotate the color wheel based on the color wheel control signal, adjusting the light emitted by the light source to the target color beam corresponding to the video signal. The light valve drive circuit controls the light valve to modulate the target color beam based on the optomechanical control signal, generating a projected image corresponding to the video signal. Since the first control signal is a signal generated based on the signal obtained during the optical engine assembly stage, there is no need for the display control circuit to repeatedly adjust the display correspondence between the light valve and the color wheel after installation, reducing the difficulty and complexity of the display control unit in adjusting the corresponding display of the color wheel and the light valve.

[0084] The circuit structure and operation process of the projection device provided in this application are explained below.

[0085] Figure 5 This is a schematic diagram of the structure of a laser projection device according to some embodiments, with reference to... Figure 5 The circuit structure shown indicates that the projection device includes a main control circuit 20, which is configured to output video signals.

[0086] The video signal is obtained through the interface set by the main control circuit 20, which includes, but is not limited to, HDMI port, USB port, optical fiber port, RJ45 network port, wireless network or Bluetooth.

[0087] The main control circuit 20 is also equipped with a key input port, an infrared remote control input port, and a far-field voice receiver port. It can display and control the video signal obtained based on the display control signals obtained from the above input ports, the aforementioned ports, or each network channel.

[0088] The main control circuit 20 is configured to, in response to the display control signal, parse the video signal it receives to obtain a video period signal and a parsed signal.

[0089] In some embodiments, the main control circuit 20 is also configured to output a light-emitting enable signal;

[0090] In some embodiments, the projection device includes a light source 601 and is electrically connected to a main control circuit 20, and is configured to emit light based on a light emission enable signal; wherein the laser output by the light source 601 is a monochromatic laser beam, such as a blue laser beam;

[0091] In some embodiments, the light source 60 includes a laser driving unit and a laser.

[0092] In some embodiments, the projection device includes a light valve driving circuit 801 and a light valve 610, which are electrically connected. The light valve driving circuit 801 is configured to drive the light valve 610 to modulate the laser.

[0093] In some embodiments, the light valve drive circuit 801 is configured to provide a first control signal; the first control signal is a signal generated based on a signal obtained therein during the optical engine assembly phase.

[0094] In some embodiments, the projection device includes a display control circuit 70, which is electrically connected to a main control circuit 20 and a light valve drive circuit 801. It is configured to obtain a first control signal from the light valve drive circuit 801 and output a color wheel control signal and an optical engine control signal based on the video signal and the first control signal.

[0095] In some embodiments, the first control signal is a signal that adjusts the rotation angle and / or rotation position of the color wheel;

[0096] Optomechanical control signals are signals used to adjust the deflection state of each optical mirror in the optical mechanism.

[0097] In some embodiments, the projection device includes a color wheel drive unit 100, and a display control circuit 70 and a color wheel 71 electrically connected. It is configured to control the rotation of the color wheel based on a color wheel control signal, so that the light emitted by the light source 60 passes through the color wheel and outputs a target color beam corresponding to the video signal. The color wheel can be a color filter wheel and a phosphor wheel, or a rotatable device that can filter colors and adjust the wavelength of light.

[0098] In some embodiments, the light valve driving circuit 801 is further configured to control the light valve 610 to modulate the target color beam based on the optomechanical control signal, thereby generating a projected image corresponding to the video signal.

[0099] In the above technical solution, during the optical engine assembly stage, when adjusting the color wheel and light valve display correspondence, the projection device transmits the determination signal to the light valve drive circuit. After the subsequent display control circuit is electrically connected to the light valve drive circuit, color wheel drive circuit, and main control circuit, the light valve drive circuit provides an adjustable first control signal for the display correspondence. Based on the first control signal and the video signal, it generates a color wheel control signal and an optomechanical control signal, which drive the color wheel to output the target color beam corresponding to the video signal and drive the light valve to generate the projected image corresponding to the video signal. This ensures the imaging quality of the projection device. The above process eliminates the need for the display control circuit to repeatedly adjust the light valve and color wheel, improving the installation and testing efficiency of the projection device.

[0100] In some embodiments, the light valve driving circuit 801 is provided with a first communication interface.

[0101] The display control circuit 70 is configured to receive a first control signal from a first communication interface based on a preset communication protocol after the optical engine assembly stage.

[0102] Generate color indicator signals based on video signals;

[0103] Based on the color indication signal and the first control signal, a color wheel control signal is sent to the color wheel drive circuit 100, and an optomechanical control signal is sent to the first communication interface.

[0104] In this application, the color indicator signal is used to indicate three colors: red, green, and blue. One possible method for indicating the color is to use two-bit encoding to adjust the pulse width, outputting different pulse signals within a specific working cycle to represent the color, such as 01 for red, 10 for green, and 11 for blue.

[0105] In some embodiments, the color wheel is marked with an indicator to mark the color calibration position of the color wheel;

[0106] The color wheel 71 is equipped with a corresponding sensor, which is configured to detect the position of the color wheel rotation.

[0107] In some embodiments, the display control circuit 70 is provided with a third communication interface, and after the optical engine assembly stage, the third communication interface of the display control circuit 70 is electrically connected to the first communication interface.

[0108] The display control circuit 70 is configured to obtain a first control signal from a first communication interface through a third communication interface based on a preset communication protocol.

[0109] Based on the sampled signal and the first control signal, output the color wheel control signal;

[0110] The color wheel drive circuit 100 is configured to adjust the rotational speed of the color wheel 71 based on the color wheel control signal.

[0111] Due to the detection characteristics of the sensor, based on the rotation of the color wheel 71, the output sampling signal is a pulse signal. The display control circuit 70 can determine the rotation speed of the color wheel based on the changing frequency of the pulse signal, and also determine the rotation position of the color wheel 71 based on the phase of the pulse signal. The display control circuit 70 performs negative feedback control based on the pulse signal to adjust the rotation speed of the color wheel 71.

[0112] The display control circuit 70 is configured to detect the real-time rotation speed of the color wheel 71 when the drive color wheel 71 rotates, compare it with the target rotation speed, and adjust the duty cycle of the PWM signal to adjust the speed of the drive motor. This negative feedback adjustment can quickly and stably adjust the drive motor to rotate according to the target speed.

[0113] In the above technical solution, the display control circuit is provided with a third communication interface, and the light valve drive circuit is provided with a first communication interface. Both of the above communication interfaces support data transmission of preset communication protocols. The third communication interface is the original communication interface of the display control circuit, and the first communication interface is the original communication interface of the light valve drive circuit. Therefore, the above circuit structure does not significantly modify the circuit structure of the projection equipment, and can improve the production efficiency of the projection equipment while slightly increasing the modification cost of the projection equipment production line.

[0114] During the optical engine assembly stage, the color wheel drive unit 100, sensor, main control circuit 20 and tooling fixture plate are electrically connected. The tooling fixture plate is provided with a second communication interface, and the second communication interface is electrically connected to the first communication interface.

[0115] The tooling fixture board is configured to receive the test video signal provided by the main control circuit 20;

[0116] Generate a test color indicator signal based on the test video signal;

[0117] Based on the color indicator signal, output the color wheel adjustment signal;

[0118] The color wheel drive circuit 100 is electrically connected to the tooling fixture board and is configured to control the color wheel 71 to rotate to the target position based on the color wheel debugging signal. The target position is the position reached by the sensor after the color wheel has rotated relative to the color calibration position. The target position is the test color corresponding to the test color indicator signal.

[0119] A second control signal is constructed based on relative parameters;

[0120] Based on a preset communication protocol, the second control signal is transmitted to the first communication interface through the second communication interface, so that when the light valve driving circuit and the display control circuit are electrically connected, the first control signal is sent to the display control circuit.

[0121] In some embodiments, color wheel 71 includes color filter wheel 712 and fluorescent wheel 711;

[0122] The color filter wheel 712 and the fluorescent wheel 711 are coaxial, and the coaxial connection between the two wheels can be described as follows: Figure 8 As shown, the axes L1 of both wheels are connected to the same drive motor. Under normal circumstances, the relative positions of the two wheels are fixed. Therefore, there is no need to correct the correspondence between the two wheels. It is only necessary to correct the correspondence between the color wheel 71 and the light valve.

[0123] The tooling fixture plate is configured to obtain the analytical signal of the test data. Based on the analytical signal, the color wheel 71 is controlled to rotate, and the light valve 610 is controlled to adjust the angle of the light mirror to display the image. In some embodiments, the displayed image can be compared with the image that the test data should display by the human eye to see if the display time of the two components is synchronized, that is, the time difference between the display time of the two components is less than the time change interval that can be observed by the human eye.

[0124] In other embodiments, two image information can be acquired by a camera, and the similarity between the two images can be compared to determine whether they should be displayed synchronously. When the similarity is less than a preset threshold, the color wheel 71 and the light valve 610 are not displayed synchronously; when the similarity is greater than or equal to the preset threshold, the color wheel 71 and the light valve 610 are displayed synchronously.

[0125] When they are out of sync, the display time of the light valve 610 needs to be adjusted based on the rotation of the color wheel 71, that is, the color of the beam it outputs, and a third control signal is constructed based on the adjusted time difference.

[0126] The third control signal is sent to the first communication interface so that when the light valve drive circuit 801 and the display control circuit 70 are electrically connected, the first control signal is sent to the display control circuit 70.

[0127] In other embodiments, the color wheel 71 includes fluorescent and color-filtering regions arranged radially along the color wheel and corresponding to the same identifier. The coaxial connection between the two wheels can be as follows: Figure 7 As shown, the outer ring is a fluorescent wheel and the inner ring is a color filter wheel. The relative positions of the two wheels are fixed. The shaft is driven to rotate by a drive motor, which also corresponds to the same logo.

[0128] Its control principle is similar to that of the coaxial color wheel 71, and will not be explained in detail here.

[0129] In other embodiments, color wheel 71 includes a color filter wheel 607 and a fluorescent wheel 604, which are off-axis, see reference. Figure 6 The circuit structure shown has a first identifier 715 on the color filter wheel 607 and a second identifier 714 on the fluorescent wheel 604; each wheel is equipped with a corresponding drive motor, which drives the wheel to rotate, and each motor is marked with a corresponding identifier.

[0130] The fluorescent wheel 604 is equipped with a first sensor 717, and the color filter wheel 607 is equipped with a second sensor 716. The two sensors are used to detect the rotation speed and rotation position of the corresponding color wheels, respectively.

[0131] There are at least one way in which the tooling fixture board is generated so that the light valve drive circuit outputs the first control signal, which will be explained below.

[0132] In some processes of determining the first control signal, the tooling fixture plate is electrically connected to the first sensor 717 and the second sensor 716 and is configured to control the rotation of the fluorescent wheel 604 to the first position and the rotation of the color filter wheel 607 to the second position based on the color indicator signal.

[0133] In some embodiments, the tooling fixture plate outputs a first pulse width modulation signal to the fluorescent wheel drive circuit 102 corresponding to the fluorescent wheel 604 to drive the fluorescent wheel 604 to rotate; and outputs a second pulse width modulation signal to the color filter wheel drive circuit 101 corresponding to the color filter wheel 607 to drive the color filter wheel 607 to rotate.

[0134] The target position includes a first position and a second position. The first position is the position reached by the first sensor 717 after the fluorescent wheel 604 rotates by a first relative parameter after passing the position corresponding to the first mark 715. The second position is the position reached by the second sensor 716 after the color filter wheel 607 rotates by a second relative parameter after passing the position corresponding to the second mark.

[0135] A second control signal is constructed based on the first relative parameter and the second relative parameter, and the second control signal is sent to the first communication interface so that when the light valve driving circuit and the display control circuit are electrically connected, the first control signal is sent to the display control circuit.

[0136] In other processes of determining the first control signal, the tooling fixture plate is also configured as follows:

[0137] Upon receiving the first adjustment instruction, and using the first identifier parameter of the fluorescent wheel 604 as a reference, the second identifier parameter of the color filter wheel 607 is adjusted until the image currently projected by the projection device is consistent with the image corresponding to the test video signal; wherein, the first identifier parameter represents the relative relationship between the starting position of the fluorescent wheel 604 under the predetermined light color and the position of the first identifier 715, and the second identifier parameter represents the relative relationship between the starting position of the color filter wheel 607 under the predetermined light color and the position of the second identifier 714;

[0138] Get the first parameter difference between the current first identifier parameter and the second identifier parameter;

[0139] A second control signal is constructed based on the first parameter difference, and the second control signal is sent to the first communication interface so that when the light valve driving circuit and the display control circuit are electrically connected, the first control signal is sent to the display control circuit.

[0140] The first parameter difference can be a phase difference, a time difference, or a position difference of the marker points; no specific limitation is made here.

[0141] In some embodiments, the first relative parameter includes a first relative delay, and the second relative parameter includes a second relative delay;

[0142] The tooling fixture plate is also configured as follows:

[0143] Upon receiving the second adjustment instruction, the third delay parameter of the light valve 610 is adjusted based on the first relative delay of the fluorescent wheel 604 or the second relative delay of the color filter wheel 607, until the time of the beam color and the image currently projected by the projection device are consistent.

[0144] The second control signal is constructed based on the third delay parameter.

[0145] In the above technical solution, during the optical engine assembly stage of the projection device, the display control circuit is not yet connected to the light source, color wheel drive circuit, light valve drive circuit, and other circuit structures. A fixture board is needed to replace the display control circuit to debug the display correspondence between the color wheel and the light valve. Since the fixture board is equipped with a second communication interface, which can transmit information with the first communication interface of the light valve drive circuit based on a preset communication protocol, the fixture board outputs a second control signal after debugging. After the optical engine assembly stage is completed, even if the fixture board is disconnected from other circuit structures, the light valve drive circuit and the display control circuit still send a first control signal to the display control circuit when they are electrically connected to regulate the corresponding display of the light valve and the color wheel. This eliminates the need to debug the correspondence between the light valve and the color wheel again after the display control circuit is installed, thus improving the installation and testing efficiency of the projection device.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0147] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A projection device, comprising: a light source configured to emit a monochromatic laser beam; a color wheel configured to emit laser beams of different colors along different optical paths after being irradiated by the laser beam; a light valve configured to modulate the color beams emitted by the color wheel and emit an image beam to a projection lens; the projection lens is configured to image the laser beam incident thereon; characterized in that the projection device further comprises a master control circuit, a light valve driving circuit, a display control circuit and a color wheel driving circuit; the master control circuit is configured to output a video signal and a light emission enable signal; the light source and the master control circuit are electrically connected and configured to emit light based on the light emission enable signal; the light valve driving circuit is configured to provide a first control signal; the first control signal is a signal generated based on a signal obtained by the light valve driving circuit during an optical engine assembly stage; the display control circuit and the master control circuit, the light valve driving circuit are electrically connected and configured to output a color wheel control signal and a light machine control signal based on the video signal and the first control signal; the color wheel driving circuit and the display control circuit, the color wheel are electrically connected and configured to control the rotation of the color wheel based on the color wheel control signal, so that the light emitted by the light source passes through the color wheel and outputs a target color beam corresponding to the video signal; the light valve driving circuit and the light valve are electrically connected and further configured to control the light valve to modulate the target color beam based on the light machine control signal, to generate a projection image corresponding to the video signal.

2. The projection device according to claim 1, characterized in that, the light valve driving circuit is provided with a first communication interface; the display control circuit and the first communication port are electrically connected, and the display control circuit is configured to receive the first control signal from the first communication interface based on a preset communication protocol; a color indication signal is generated based on the video signal; based on the color indication signal and the first control signal, the color wheel control signal is sent to the color wheel driving circuit, and the light machine control signal is sent to the first communication interface.

3. The projection device according to claim 2, characterized in that, the color wheel is provided with an identifier for marking a color calibration position of the color wheel; the color wheel is provided with a corresponding sensor, which is configured to output a sampling signal representing the position of the color wheel rotation; the display control circuit is provided with a third communication interface, which is electrically connected with the first communication interface after the optical engine assembly stage; the display control circuit and the sensor are electrically connected and configured to acquire the first control signal from the first communication interface through the third communication interface based on the preset communication protocol; the color wheel control signal is output based on the sampling signal and the first control signal; the color wheel driving circuit is configured to adjust the rotation speed of the color wheel based on the color wheel control signal.

4. The projection device according to claim 2 or 3, characterized in that, the preset communication protocol includes an I2C communication protocol.

5. The projection apparatus according to claim 3, wherein, during the optical engine assembly stage, the sensor, the master control circuit and a tooling jig plate are electrically connected, the tooling jig plate is provided with a second communication interface, and the second communication interface is electrically connected with the first communication interface of the light valve driving circuit; The tooling jig plate is configured to obtain a test video signal provided by the master control circuit; Based on the test video signal, a test color indication signal is generated; Based on the color indication signal, a color wheel debugging signal is output; The color wheel driving circuit and the tooling jig plate are electrically connected and configured to regulate the color wheel to rotate to a target position based on the color wheel debugging signal, the target position being a position reached by the sensor after the color wheel rotates through the color calibration position by a relative parameter, and the target position being a test color corresponding to the test color indication signal; Based on the relative parameter, a second control signal is constructed; Based on the preset communication protocol, the second control signal is sent to the first communication interface through the second communication interface, so that the light valve driving circuit and the display control circuit are electrically connected to send the first control signal to the display control circuit.

6. The projection apparatus according to claim 5, wherein, The color wheel includes a color filter wheel and a fluorescent wheel; The color filter wheel and the fluorescent wheel are coaxial and correspond to the same identifier.

7. The projection apparatus according to claim 5, wherein, The color wheel includes a fluorescent region and a color filter region, and the fluorescent region and the color filter region are arranged along the radial direction of the color wheel and correspond to the same identifier.

8. The projection apparatus according to claim 5, wherein, The color wheel includes a color filter wheel and a fluorescent wheel; The color filter wheel and the fluorescent wheel are coaxial, the color filter wheel is provided with a first identifier, and the fluorescent wheel is provided with a second identifier; The fluorescent wheel is correspondingly provided with a first sensor, and the color filter wheel is correspondingly provided with a second sensor; The tooling jig plate and the first sensor and the second sensor are electrically connected and configured to regulate the fluorescent wheel to rotate to a first position and regulate the color filter wheel to rotate to a second position based on the color indication signal; The target position includes the first position and the second position, the first position being a position reached by the first sensor after the fluorescent wheel rotates through a position corresponding to the first identifier by a first relative parameter, and the second position being a position reached by the second sensor after the color filter wheel rotates through a position corresponding to the second identifier by a second relative parameter; The second control signal is constructed based on the first relative parameter and the second relative parameter.

9. The projection apparatus according to claim 8, wherein, The tooling jig plate is further configured to obtain a first adjustment instruction, adjust the second identifier parameter of the color filter wheel based on the first identifier parameter of the fluorescent wheel until the image currently projected and displayed by the projection device is consistent with the image corresponding to the test video signal; wherein the first identifier parameter represents the relative relationship between the starting position of the fluorescent wheel under a predetermined light color and the position of the first identifier, and the second identifier parameter represents the relative relationship between the starting position of the color filter wheel under the predetermined light color and the position of the second identifier; obtain a first parameter difference of the current first identifier parameter and the second identifier parameter; construct the second control signal based on the first parameter difference.

10. The projection apparatus according to claim 9, wherein, The first relative parameter includes a first relative delay, and the second relative parameter includes a second relative delay; The tooling jig plate is further configured to obtain a second adjustment instruction, and adjust a third delay parameter of the light valve driving circuit based on the first relative delay of the fluorescent wheel or the second relative delay of the color filter wheel until the time of the light beam color and the image currently projected and displayed by the projection device is consistent; construct a third control signal based on the third delay parameter; send the third control signal to the first communication interface, so that the light valve driving circuit sends the first control signal to the display control circuit when the light valve driving circuit and the display control circuit are electrically connected.

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