Projection picture display method and laser projection apparatus

Abstract

The present application relates to a projection picture display method and a laser projection apparatus. The method comprises: receiving an image signal, and determining an image pixel arrangement mode of the image signal; when the image pixel arrangement mode is an orthogonal arrangement and the arrangement mode of a digital micromirror device is a diamond pixel arrangement, using a preset scaling ratio to perform pixel scaling on the image signal; and performing dimensionality reduction sampling on the image signal that has been subjected to the pixel scaling and, on the basis of the image signal that has been subjected to the dimensionality reduction sampling, generating a control signal for controlling a laser light source and a drive signal for the digital micromirror device.

Description

Projection display methods and laser projection equipment

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on March 27, 2025, with application number 2025103771108 and entitled "Projection Screen Display Method and Laser Projection Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of display device technology, and in particular to a method for displaying projected images and a laser projection device. Background Technology

[0004] Currently, most projection products used for video playback employ orthogonal pixel arrangement (also known as Manhattan array) DMDs (digital micromirror devices). With the advent of rhombus-shaped pixels, using DMDs with rhombus-shaped pixel arrangement for video playback and projection can improve light coupling efficiency, enhance product output brightness and contrast, and reduce the size of the optical engine, thus increasingly meeting user demands. However, for rhombus-shaped pixel arrangement DMDs, when the input orthogonal image does not match the pixels on the DMD, there is a problem that the input orthogonal image cannot be directly mapped onto the DMD for projection display. Summary of the Invention

[0005] This application provides a projection screen display method and a laser projection device to improve the accuracy of projecting received image signals based on digital micromirror devices, thereby improving the correctness of image display.

[0006] Firstly, a method for displaying a projected image is provided, the method comprising:

[0007] Receive image signals and determine the arrangement of image pixels in the image signals;

[0008] When the image pixels are arranged in an orthogonal pattern and the digital micromirror device is arranged in a diamond pixel pattern, the image signal is pixel scaled using a preset scaling ratio to obtain a pixel-scaled image signal. The ratio of the number of image pixels in the pixel-scaled image signal to the number of image pixels in the image signal before pixel scaling is the square of the preset scaling ratio. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement.

[0009] The image signal after pixel scaling is sampled in a lower dimension, and a control signal for controlling the laser source and a driving signal for the digital micromirror device are generated based on the image signal after the lower dimension sampling. The control signal is configured to control the laser source to emit a laser beam, and the driving signal is configured to drive the digital micromirror device. The laser beam is modulated into a projection beam after passing through the digital micromirror device and is directed towards the projection lens.

[0010] Based on this embodiment, after receiving an image signal, when the image pixels are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, the received image signal is scaled and dimensionality reduced by sampling. This generates control signals for controlling the laser light source and driving signals for the digital micromirror device. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement. This effectively overcomes the influence of inconsistent aspect ratios caused by the difference in row and column spacing between the row and column pixels in the diamond pixel arrangement and the orthogonal pixel arrangement. Thus, it can achieve correct output while ensuring the aspect ratio of the received image signal, improving the accuracy of image display.

[0011] Secondly, a method for displaying a projected image is provided, the method comprising:

[0012] Receive image signals and determine the arrangement of image pixels in the image signals;

[0013] When the image pixels are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, a second correspondence relationship matching the image resolution of the image signal is obtained. The second correspondence relationship is the correspondence relationship between the image pixels of the image signal and the micromirrors of the digital micromirror device. The second correspondence relationship is determined based on the proportional relationship between the row spacing between the orthogonally arranged micromirrors and the row spacing between the diamond-arranged micromirrors, and the proportional relationship between the column spacing between the orthogonally arranged micromirrors and the column spacing between the diamond-arranged micromirrors. In this case, one micromirror corresponds to one or more image pixels.

[0014] Based on the second correspondence, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

[0015] Based on this embodiment, after receiving an image signal, when the image pixels are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated by determining a second correspondence based on the proportional relationship between the row spacing of the orthogonally arranged micromirrors and the row spacing of the diamond-arranged micromirrors, and the proportional relationship between the column spacing of the orthogonally arranged micromirrors and the column spacing of the diamond-arranged micromirrors. This effectively overcomes the influence of the inconsistent aspect ratio caused by the difference in row and column spacing between the diamond-arranged and orthogonal pixel rows and columns, thereby enabling correct output while ensuring the correct aspect ratio of the received image signal, thus improving the accuracy of image display.

[0016] Thirdly, a method for displaying a projected image is provided, the method comprising:

[0017] Receive image signals and determine the arrangement of image pixels in the image signals;

[0018] When the image pixels are arranged in an orthogonal arrangement and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, a control signal for controlling the laser source and a driving signal for the digital micromirror device are generated according to the preset one-to-one correspondence between the image pixels and the micro-reflective mirrors. The control signal is used to control the laser source to emit a laser beam, and the driving signal is used to drive the digital micromirror device. The laser beam is modulated into a projection beam after passing through the digital micromirror device and is directed towards the projection lens.

[0019] When the image pixels are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, the minimum number of columns and the minimum number of rows for displaying the received image signal using a diamond pixel arrangement are determined based on the proportional relationship between the row spacing of adjacent pixels in the orthogonal pixel arrangement and the row spacing of adjacent pixels in the diamond pixel arrangement, as well as the proportional relationship between the column spacing of adjacent pixels in the orthogonal pixel arrangement and the column spacing of adjacent pixels in the diamond pixel arrangement. The effective display area for displaying the received image signal using a diamond pixel arrangement is then determined based on the minimum number of columns and the minimum number of rows.

[0020] Fourthly, a laser projection device is provided, comprising: a display panel and a system motherboard, wherein the display panel includes a main control circuit, an algorithm processing circuit, and a digital micromirror device;

[0021] The algorithm processing circuit is configured as follows:

[0022] Receive image signals from the system motherboard;

[0023] When the image pixels of the image signal are arranged in an orthogonal arrangement, and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, the received image signal is output.

[0024] When the image pixels of the image signal are arranged orthogonally and the digital micromirror devices are arranged in a diamond pixel arrangement, a second correspondence relationship matching the image resolution of the image signal is obtained, and an image signal is output based on the received image signal and the second correspondence relationship. The second correspondence relationship is determined according to the proportional relationship between the row spacing between the orthogonally arranged micromirrors and the row spacing between the diamond-arranged micromirrors, and the proportional relationship between the column spacing between the orthogonally arranged micromirrors and the column spacing between the diamond-arranged micromirrors. One micromirror corresponds to one or more image pixels.

[0025] The main control circuit is configured to receive the image signal output by the algorithm processing circuit, generate a control signal to control the laser source and a drive signal to the digital micromirror device. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

[0026] Fifthly, a laser projection device is provided, comprising: a display panel and a system motherboard, wherein the display panel includes a main control circuit, an algorithm processing circuit, and a digital micromirror device;

[0027] The algorithm processing circuit is configured as follows:

[0028] Receive image signals from the system motherboard;

[0029] When the image pixels of the image signal are arranged in an orthogonal arrangement, and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, the received image signal is output.

[0030] When the image pixels of the image signal are arranged orthogonally and the digital micromirror device is arranged in a diamond pixel arrangement, the image signal is pixel scaled using a preset scaling ratio to obtain a pixel-scaled image signal. After dimensionality reduction sampling of the pixel-scaled image signal, the dimensionality-reduced image signal is output. The ratio of the number of image pixels in the pixel-scaled image signal to the number of image pixels in the image signal before pixel scaling is the square of the preset scaling ratio. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement.

[0031] The main control circuit is configured to receive the image signal output by the algorithm processing circuit, generate a control signal to control the laser source and a drive signal to the digital micromirror device. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the micromirror pixels of the digital micromirror device to flip. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

[0032] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 is a structural diagram of a laser projection device according to some embodiments of this application;

[0035] Figure 2 is a schematic diagram of the projection imaging optical path of a laser projection device according to some embodiments of this application;

[0036] Figure 3 is a structural diagram of a projection system according to some embodiments of this application;

[0037] Figure 4 is a circuit control schematic diagram of a laser projection device according to some embodiments of this application;

[0038] Figure 5 is a schematic diagram of the optical path for reflecting an illumination beam using a tiny reflective lens in a digital micromirror device according to some embodiments of this application.

[0039] Figure 6 is a flowchart illustrating a projection screen display method according to some embodiments of this application;

[0040] Figure 7 is a flowchart illustrating a projection screen display method according to some other embodiments of this application;

[0041] Figure 8 is a schematic diagram of orthogonal pixel arrangement and diamond pixel arrangement in some embodiments of this application;

[0042] Figure 9 is a schematic diagram of the pixel spacing of orthogonal pixel arrangement and diamond pixel arrangement in some embodiments of this application;

[0043] Figure 10 is a schematic diagram of the pixel spacing of orthogonal pixel arrangement and diamond pixel arrangement in some other embodiments of this application;

[0044] Figure 11 is a schematic diagram of the light incident and exit directions of a diamond-shaped pixel arrangement according to some embodiments of this application;

[0045] Figure 12 is a schematic diagram of the arrangement of column pixels in a diamond-shaped pixel arrangement according to some embodiments of this application;

[0046] Figure 13 is a schematic diagram of the row pixel arrangement of a diamond pixel arrangement in some embodiments of this application;

[0047] Figure 14 is a schematic diagram of the row and column arrangement of a DMD with a diamond pixel arrangement that can support displaying images with a resolution of 1920*1080 according to some embodiments of this application.

[0048] Figure 15 is a schematic diagram of a one-to-one mapping of a 4*4 orthogonal image to a 4*4 rhombus pixel arrangement in some embodiments of this application;

[0049] Figure 16 is a schematic diagram of cross-sampling in some embodiments of this application;

[0050] Figure 17 is a schematic diagram of pixel scaling and mapping of orthogonal images to a diamond pixel arrangement according to some embodiments of this application;

[0051] Figure 18 is a schematic diagram of the display control process for displaying a 1920*1080 orthogonal image on a DMD with diamond pixel arrangement according to some embodiments of this application.

[0052] Figure 19 is a schematic diagram illustrating the pixel scaling and dimensionality reduction sampling of a 1920*1080 orthogonal image displayed on a DMD with diamond pixel arrangement according to some embodiments of this application.

[0053] Figure 20 is a flowchart illustrating a projection screen display method according to some other embodiments of this application. Detailed Implementation

[0054] The 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 represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0055] 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.

[0056] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0057] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0058] The term "module" refers to any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0059] When used here, the singular forms of “a,” “an,” and “the” can also include the plural forms, unless the context clearly indicates otherwise.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] Figure 1 is a structural diagram of a laser projection device according to some embodiments. Referring to Figure 1, the laser projection device 01 includes a light source 10, a light modulation assembly 20, and a lens 30. The laser projection device 01 may also include a housing 40 (only a portion of the housing 40 is shown in Figure 1).

[0062] Light source 10 is configured to provide an illumination beam and transmit it to light modulation assembly 20. Light modulation assembly 20 is configured to modulate the illumination beam provided by light source 10 using an image signal to obtain a projection beam. Lens 30 is configured to project a projection image onto a screen or wall at a certain projection ratio to form a projection image. Light source 10, light modulation assembly 20, and lens 30 can be assembled in housing 40. Light source 10, light modulation assembly 20, and lens 30 are connected sequentially along the beam propagation direction.

[0063] The light source 10, the light modulation component 20, and the lens 30 can each be enclosed by a corresponding housing. The housings corresponding to the light source 10, the light modulation component 20, and the lens 30 can support the corresponding optical components and ensure that each optical component meets certain sealing or airtight requirements.

[0064] In this example, the optical modulation component 20 includes a reflective optical valve, such as a digital micromirror device (DMD).

[0065] Figure 2 is a schematic diagram of the projection imaging optical path of a laser projection device according to some embodiments. As shown in Figure 2, the laser projection device mainly includes a light source 10, a light modulation component 20, and a lens 30. In some examples, the light source 10 includes a laser component of at least one color; for example, the laser component can emit blue laser light. In some examples, the light source 10 includes a tri-color laser component configured to emit tri-color laser beams, and the tri-color lasers have a wide color gamut and high brightness, enabling the provision of high-quality illumination beams. The light source 10 may include one set of tri-color lasers or multiple sets of tri-color lasers, thereby providing higher optical power.

[0066] In some examples, the light source 10 includes a laser assembly 110, a first homogenizing component 120, and a speckle-reducing component 130, so that the tri-color laser emitted from the laser assembly 110 is homogenized and speckle-reduced before being incident on the light modulation component 20, thereby improving the quality of the illumination beam.

[0067] In some examples, the first homogenizing component 120 is a compound eye lens or a diffuser, configured to homogenize the energy distribution of the combined light spot after the laser assembly 110 has combined.

[0068] In some examples, the speckle-reducing component 130 can be a motion diffuser, such as a vibrating diffuser or a selected diffuser wheel, or it can be a diffraction element, such as a DOE element.

[0069] In some examples, the light modulation assembly 20 includes an illumination light path and a light valve 220, wherein the illumination light path includes lenses, mirrors, and light homogenizing components, etc. Referring to Figure 2, in some embodiments, the illumination light path includes a second light homogenizing component 210. In some examples, the second light homogenizing component 210 can be a compound eye lens, such as a double-sided compound eye lens. In other examples, the second light homogenizing component 210 can also be a light guide. The second light homogenizing component 210 is configured to homogenize and shape the illumination beam again to match the incident requirements of the light valve 220. The prism assembly 230 is configured to guide the illumination beam to the light receiving surface of the light valve 220 through transmission and reflection processing, and then guide the beam emitted from the light valve 220 to the projection lens 30. The light valve 220 is the core device in the light modulation assembly 20, configured to modulate the illumination beam incident upon it into a projection beam according to the image signal, and project the projection beam onto the lens 30.

[0070] In some examples, the light valve 220 is a reflective light valve. For instance, the light valve 220 is a digital micromirror device (DMD). A DMD comprises multiple (e.g., thousands) tiny mirrors that can be individually driven and rotated. These tiny mirrors can be arranged in an array. Each tiny mirror (e.g., each micromirror) corresponds to a pixel in the projected image to be displayed.

[0071] Depending on the projected image to be displayed, multiple tiny reflective mirrors of the light valve 220 repeatedly flip and switch between ON and OFF states. In the ON state, the light beam is reflected to the lens 30; in the OFF state, the light beam is reflected elsewhere or absorbed, preventing the light beam from entering the lens 30. Through the integration effect of the ON / OFF states, the projected image exhibits variations in color brightness. In this way, the light valve 220 modulates the illumination beam to obtain the projection beam, and the image is displayed through the projection beam.

[0072] In some embodiments, the laser projection device 01 may further include an illumination mirror group located between the light valve 220 and the second light homogenizing component 210. The illumination mirror group includes a reflector, a lens, etc., which are respectively configured to fold the light path or compress the light spot size.

[0073] Figure 3 is a schematic diagram of the circuit control system of a laser projection device provided in some embodiments of this application.

[0074] As shown in Figure 3, the circuit control system of this example includes a power supply board 50, a display board 200, and a system mainboard 300. The power supply board 50 is configured to supply power to the system circuitry.

[0075] The display panel 200 is connected to the system motherboard 300 and is also called the multimedia signal board (configured to decode audio and video streams). During the projection display process, after receiving the video image signal, the display panel 200 decomposes or further processes the video image signal (such as geometric correction processing), and can also generate control signals for the light source and light valve based on the processed video signal.

[0076] As shown in the example in Figure 3, the display board 200 includes a main control circuit 240. The main control circuit 240 is configured to receive video image signals and send control or drive signals to the light source and light valve according to the image signals. The video image signal S1 can be directly transmitted to the main control circuit 240 (including its peripheral drive circuit), or it can be processed first by an algorithm processing circuit 241, such as geometric correction or dispersion correction, before being transmitted. In some main control chips with higher processing capabilities, the algorithm processing circuit 241 can be integrated into the main control circuit 240.

[0077] Furthermore, the main control circuit 240 is also configured to connect to the light source driving component 140, transmit dimming signals, and ultimately drive the laser light source 110 to emit or extinguish. The dimming signals may include analog dimming (Adim) signals and pulse width modulation (PWM) signals.

[0078] The PWM signal is configured to be converted into the magnitude of the drive current transmitted to the laser source 110, and the Adim signal in the dimming signal is configured to control the magnitude of the current value of the drive current.

[0079] In some examples of time-sequential light source drivers, the main control circuit 240 is also configured to output an image enable signal. The image enable signal is configured to control the different emission timings of the three primary colors (red, green, and blue). In some examples, the image enable signal is a PWM (Pulse Width Modulation) signal, but unlike the dimming signal described above, the PWM signal of the image signal has a lower frequency and a period that is a multiple of the frame rate. The superposition of the image enable signal and the dimming signal for each primary color generates a drive signal for controlling the emission or extinguishing of that primary color, thus achieving the sequential illumination of the three primary colors within each display cycle.

[0080] Correspondingly, in the time-sequential light source driving example, each primary color laser light source 110 can have a corresponding light source driving component 140. Figure 3 only illustrates the signal transmission connection relationship in principle. The light source driving component 140, also known as the laser driving circuit, typically includes a DC-DC conversion circuit (e.g., a boost circuit or a buck circuit), a selection switch circuit, and a driving chip. The light source driving component 140 can convert a PWM dimming signal or a superposition of an image enable signal and a dimming signal into a voltage or current signal capable of driving the laser. In some examples, the driving chip outputs a current signal to the positive and negative terminals of the laser, thereby driving the laser to emit light.

[0081] The laser source 110 emits light under the drive of the driving current and transmits the light to the optical valve 220 for modulation.

[0082] The light valve 220 has a drive control circuit (not shown in the figure; in some examples, the main control circuit 240 also includes the drive control circuit for the light valve 220). The main control circuit 240 decomposes the image primary color component signals according to the image signal to be displayed, and converts the image primary color component signals into drive signals that can directly drive the light valve 220 through the light valve drive control circuit. When the light valve 220 receives the drive signal corresponding to the red primary color component signal, the laser light source 110 synchronously emits red primary color light and illuminates the light valve 220. Thus, the light valve 220 modulates the red primary color light according to the drive signal corresponding to the image primary color component signal, converting it into a projection beam carrying image content information. Therefore, the control of the laser light source 110 and the light valve 220 by the main control circuit 240 is synchronous, thereby displaying the projected image normally.

[0083] In some examples, the laser source 110 includes at least one laser, the at least one laser emitting beams of light that may be the same or different colors.

[0084] Each laser can include multiple laser-emitting chips.

[0085] The laser source 110 may include a monochromatic laser or a multicolor laser, such as a dual-color laser including a red laser and a blue laser, or a tricolor laser including a red laser, a blue laser and a green laser.

[0086] In this example, the laser source 110 includes a red laser, a blue laser, and a green laser. Correspondingly, the light source driving component 140 includes a red light driving circuit, a green light driving circuit, and a blue light driving circuit. Each of the three lasers is connected to its corresponding light source driving component 140.

[0087] The three lasers, driven by a driving current, can emit red, green, and blue light respectively. Based on the principle of color synthesis in optics, the three colors of light can be combined to produce white light. Under timed emission control, the three primary colors of light can also be mixed to form white light.

[0088] In some examples, the light valve 220 is a digital micromirror device (DMD). The DMD is the core optical modulation device in the optical modulation assembly. The DMD drive circuit is used to drive the DMD based on the video image signal.

[0089] For example, the DMD receives the drive control signal corresponding to the image primary color component signal, and flips the thousands of tiny mirrors on its surface at the positive angle (ON state) or negative angle (OFF state) corresponding to the drive signal, so that the light beam illuminating its surface forms the image beam to be projected and displayed, and is reflected into the projection lens.

[0090] As shown in Figure 5, the light reflected by the micromirror 221 in the DMD220 at a negative deflection angle is called OFF light. OFF light is ineffective light. The light reflected by the micromirror 221 at a positive deflection angle is called ON light. ON light is the effective light beam that the micromirror 221 on the surface of the digital micromirror device (DMD) receives the illumination beam and enters the lens 30 through a positive deflection angle, used for projection imaging. The on state of the micromirror 221 is the state that the micromirror 221 is in and can maintain when the illumination beam emitted by the light source assembly 10 can enter the lens 30 after being reflected by the micromirror 221, that is, the time integral state of the micromirror 221 at a positive deflection angle. The off state of the micromirror 221 is the state that the micromirror 221 is in and can maintain when the illumination beam emitted by the light source assembly 10 cannot enter the lens 30 after being reflected by the micromirror 221, that is, the state of the micromirror 221 at a negative deflection angle.

[0091] During the display cycle of one frame of an image, some or all of the micromirrors 221 switch between on and off states countless times, thereby determining the grayscale of each pixel in the image frame based on the duration of each micromirror 221 in its on and off states. For example, when a pixel has 256 grayscale levels from 0 to 255, the micromirror 221 corresponding to the pixel with grayscale 0 is off throughout the entire display cycle of the image frame, the micromirror 221 corresponding to the pixel with grayscale 255 is on throughout the entire display cycle of the image frame, and the micromirror 221 corresponding to the pixel with grayscale 127 is on for half the time and off for the other half of the display cycle of the image frame. Therefore, by controlling the state of each micromirror 221 in the digital micromirror device within the display cycle of one frame of an image and the duration of each state, the brightness (grayscale) of the pixel corresponding to that micromirror 221 can be controlled, thereby modulating the illumination beam projected onto the digital micromirror device.

[0092] In some examples provided in this application, the display panel 200 is also configured to control peripheral motion devices 271 via an MCU microcontroller 270. Referring to the schematic diagram of the projection optics system architecture shown in Figure 2, when the first light-diffusing component 120 is a moving diffuser, it needs to receive control commands from the display panel 200 to start or stop the movement, and its movement cycle matches the emission cycle of the light source.

[0093] Furthermore, the motion device 271 can also be a galvanometer component, used for multiple vibrations to superimpose multiple sub-component image beams of the image to be displayed, utilizing the persistence of vision of the human eye to achieve high-definition image display, with a visual effect of improved resolution.

[0094] Furthermore, in some examples provided in this application, the system motherboard 300 includes a core device SOC 301, also known as a TV main chip SOC, which is configured to decode the audio and video streams of the input device. In addition to sending the decoded video signal to the display 200, it is also configured to control various functions of the projection device, such as audio, wireless WIFI, and UI interface interaction.

[0095] Figure 4 illustrates an example of a projection system provided in some embodiments of this application. The projection system includes a projection device body and a projection medium, typically an optical screen. This example is an ultra-short-throw projection system with a small throw ratio, allowing the projection device body to display a large-sized projected image on the projection screen within a short projection distance.

[0096] In this example, the projection lens is an ultra-short-throw projection lens, which is configured to project an image beam onto a projection screen to achieve projected image display. The main body of the projection device in this embodiment is an ultra-short-throw laser projection device.

[0097] Based on the laser projection display device described above, this application also provides a method for displaying projected images.

[0098] In some embodiments, as shown in FIG6, the method for displaying the projected image includes:

[0099] Step S601: Receive the image signal and determine the image pixel arrangement of the image signal;

[0100] Step S602: When the image pixels are arranged in an orthogonal arrangement and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated according to the preset one-to-one correspondence between the image pixels and the micro-reflective mirrors. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

[0101] Step S603: When the image pixel arrangement is orthogonal and the digital micromirror device is arranged in a diamond pixel arrangement, a second correspondence relationship matching the image resolution of the image signal is obtained. The second correspondence relationship is the correspondence relationship between the image pixels of the image signal and the micromirrors of the digital micromirror device. The second correspondence relationship is determined based on the proportional relationship between the row spacing between the orthogonally arranged micromirrors and the row spacing between the diamond-arranged micromirrors, and the proportional relationship between the column spacing between the orthogonally arranged micromirrors and the column spacing between the diamond-arranged micromirrors. In this case, one micromirror corresponds to one or more image pixels.

[0102] Step S604: Based on the second correspondence, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

[0103] Multiple correspondences can be pre-stored, with each orthogonal image resolution corresponding to one correspondence. A second correspondence matching the image resolution of the received image signal can be obtained from the stored multiple correspondences.

[0104] In other examples, the second correspondence may also be generated in real time based on the image resolution of the received image signal after the image signal is received. The method of generating the second correspondence is illustrated in the following examples.

[0105] In some other embodiments, as shown in FIG7, the method for displaying the projected image includes:

[0106] Step S701: Receive the image signal and determine the image pixel arrangement of the image signal;

[0107] Step S702: When the image pixels are arranged in an orthogonal arrangement and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated according to the preset one-to-one correspondence between the image pixels and the micro-reflective mirrors. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated into a projection beam by the digital micromirror device and directed toward the projection lens.

[0108] Step S703: When the image pixels are arranged orthogonally and the digital micromirror device is arranged in a diamond pixel arrangement, the image signal is pixel-scaled using a preset scaling ratio to obtain a pixel-scaled image signal. The ratio of the number of pixels in the pixel-scaled image signal to the number of pixels in the image signal before pixel scaling is the square of the preset scaling ratio. The preset scaling ratio is determined based on the horizontal distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement. In some examples, the number of row pixels in the pixel-scaled image signal is the product of the number of row pixels in the image signal before pixel scaling and the preset scaling ratio, and the number of column pixels in the pixel-scaled image signal is the product of the number of column pixels in the image signal before pixel scaling and the preset scaling ratio, so that the ratio of the number of pixels in the pixel-scaled image signal to the number of pixels in the image signal before pixel scaling is the square of the preset scaling ratio.

[0109] Step S704: Dimensionally reduce the image signal after pixel scaling, and generate a control signal for controlling the laser source and a drive signal for the digital micromirror device based on the dimensionally reduced image signal. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated into a projection beam by the digital micromirror device and directed towards the projection lens.

[0110] There are two main ways to arrange the pixels of an image signal and the digital micromirror device: one is orthogonal arrangement, also known as orthogonal pixel arrangement or Manhattan arrangement; the other is diamond pixel arrangement, also known as diamond arrangement.

[0111] Taking the 4*4 arrangement as an example, the orthogonal arrangement is shown in Figure 8(1), and the diamond pixel arrangement is shown in Figure 8(2). Comparing Figure 8(1) and Figure 8(2), it can be seen that the orthogonal arrangement is an orthogonal matrix with a grid pattern, and the diamond pixel arrangement is equivalent to the orthogonal pixels being rotated by 45° for arrangement.

[0112] If the image pixels are arranged orthogonally, and the micromirrors of the digital micromirror device are also arranged orthogonally, then the image pixel arrangement of the image signal and the micromirrors of the digital micromirror device are both orthogonal as shown in Figure 8(1). Therefore, each image pixel of the image signal corresponds one-to-one with each micromirror of the digital micromirror device, that is, each image pixel of the image signal corresponds one-to-one with each pixel of the DMD. Therefore, the signal of each image pixel can be mapped one-to-one to each micromirror on the DMD for output. In other words, based on the signal of each image pixel, a control signal for controlling the laser source and a driving signal for the digital micromirror device are generated. The control signal controls the laser source to emit laser pixels, and the driving signal drives the rotation of the corresponding micromirrors in the digital micromirror device, thereby adjusting the laser beam into a projection beam and projecting it onto the projection lens.

[0113] If the image pixels are arranged orthogonally, while the micromirrors of the digital micromirror device are arranged in a diamond pattern, then the image pixels of the image signal are arranged orthogonally as shown in Figure 8(1), while the micromirrors of the digital micromirror device are arranged in a diamond pattern as shown in Figure 8(2). As can be seen from Figure 8, due to the difference between the image pixel arrangement and the diamond arrangement of the micromirrors, the resolution displayed by orthogonal pixel arrangements and diamond pixel arrangements with the same number of rows and columns differs. Therefore, orthogonal image pixels are difficult to directly map one-to-one onto the DMD with a diamond pixel arrangement for display. This difference in resolution is based on the difference in distance between pixels in orthogonal and diamond pixel arrangements, as shown below.

[0114] Referring to Figure 9, in an orthogonal arrangement, the distance between the centers of pixels in each row and column is the pixel size P, as shown in Figures 9(1) and 10(1). However, in a rhombus pixel arrangement, the distance between the centers of pixels along the diagonals is the pixel size P, as shown in Figure 9(2). Since the pixels in the rhombus pixel arrangement are the same size as those in the Manhattan pixel arrangement, except that the orientation of each pixel is rotated by 45°, the horizontal spacing between pixels is... Vertical spacing is As shown in Figure 10(2).

[0115] Based on this, if the input video content is an M*N orthogonal image (i.e., an image with orthogonally arranged pixels), for a Manhattan pixel arrangement DMD (i.e., a digital micromirror device with orthogonally arranged micromirrors), if the image pixels are mapped one-to-one into the DMD micromirrors, since the Manhattan pixel arrangement has N rows and M columns, the width of the DMD pixel display area is equal to the length of a single pixel P multiplied by the number of columns M, i.e., width = P*M, and the height is equal to the length of a single pixel P multiplied by the number of rows N, i.e., height = P*N. Therefore, the aspect ratio WH1 of the displayed image is equal to the width divided by the height, i.e.:

[0116] From equation (1), we can see that the aspect ratio of the video displayed by the DMD with orthogonal pixel arrangement is the ratio of the number of columns to the number of rows.

[0117] However, for videos with the same input of an M*N orthogonal image, the aspect ratio of the video displayed by a DMD with a rhombus pixel arrangement (i.e., the arrangement of tiny reflective mirrors in a digital micromirror device is a rhombus pixel arrangement) changes. Therefore, referring to Figure 10, in a rhombus pixel arrangement, the diagonal spacing of the pixels is P, so the width W2 of the video displayed by a DMD with a rhombus pixel arrangement is equal to the horizontal spacing of the pixels multiplied by the number of columns M, that is:

[0118] The height H2 is equal to the vertical pixel spacing multiplied by the number of rows N, i.e.

[0119] Therefore, the aspect ratio WH2 of an image displayed by a DMD with a diamond pixel arrangement is equal to the width W2 divided by the height H2, that is:

[0120] As can be seen from the above equations, when the input image is an orthogonal image with an M*N resolution, the DMD with a diamond pixel arrangement stretches the input orthogonal image by a factor of 2 in the horizontal direction. That is, the image displayed by the orthogonal pixel arrangement DMD is not stretched or compressed in the horizontal and vertical directions; it is displayed at a 1:1 ratio. However, the image displayed by the diamond pixel arrangement DMD is different. Because in a diamond pixel arrangement, the rows overlap by half a pixel, while the columns do not overlap, the physical aspect ratio of the active micromirror pixel arrangement in the diamond pixel arrangement DMD is actually 2:1. This can be understood as the DMD performing a 2:1 horizontal stretch.

[0121] Taking an orthogonal image with a 4x4 pixel arrangement as an example, as shown in Figure 10, the orthogonal pixel arrangement maps the input pixels one-to-one to the DMD micromirror arrangement for output. Therefore, the number of rows is 4, the number of columns is 4, and the aspect ratio is 4:4 = 1:1. Similarly, the diamond pixel arrangement maps the input pixels one-to-one to the diamond-shaped DMD micromirror arrangement for output, with a width of... Height is Therefore, an orthogonal input with an aspect ratio of 2:1, or 1:1, is mapped onto a DMD with a diamond-shaped pixel arrangement. The DMD then stretches the input image by a factor of 2 in the horizontal direction for display.

[0122] Based on this, when the image pixels of the input image signal are arranged orthogonally and the digital micromirror device is arranged in a diamond pixel arrangement, the image pixels and the micromirror are no longer in a one-to-one correspondence. Therefore, the image signal needs to be processed to map it onto the micromirror for output.

[0123] As shown above, since the input image's pixel arrangement is orthogonal, the image is stretched horizontally when displayed on a DMD with a diamond pixel arrangement. Therefore, it is necessary to first determine how many diamond pixels are needed in the row and column directions of the diamond pixel arrangement when the resolution of the image displayed on the DMD with the diamond pixel arrangement matches the resolution of the input orthogonal image, and how to map the input orthogonal image onto the diamond pixel arrangement for display.

[0124] Referring to Figure 11, in a DMD with a diamond-shaped pixel arrangement, pixel (0,0) is located in the lower left corner of the DMD. Illuminating light enters from the left side of the DMD, and the diamond-shaped micromirrors tilt and flip around their vertical axis. When the micromirrors are tilted towards the direction of the incident light (to the left as shown in Figure 11), they are in the "on" state, and the incident light is reflected by the micromirrors and enters the lens and is projected out. When the micromirrors are tilted away from the direction of the incident light (to the right as shown in Figure 11), they are in the "off" state, and the incident light is reflected by the micromirrors and exits from the right side, where it is absorbed by the absorber. The DMD arrangement has M columns and N rows of pixels, with a total number of pixels equal to M*N.

[0125] In the diamond pixel arrangement, the column arrangement and row arrangement are shown in Figure 12 and Figure 13, respectively.

[0126] As shown in Figure 12, N pixels are arranged sequentially from top to bottom to form a column, numbered 0, 1, 2...M-1 from left to right, for a total of M columns. The prominent columns with a gray background and the non-prominent columns with a white background are displayed alternately. In Figure 12, the dashed lines show the trajectory of the lines connecting the center points of the three diamond-shaped pixels in columns 0, 1, and 2. Pixels along the trajectory of each center point connection line form a column.

[0127] In Figure 13, M pixels are arranged from left to right to form a row. Adjacent rows overlap by half a pixel, so the row spacing is only half a pixel, which is half the horizontal or vertical length of a rhombus pixel, or half the diagonal length of a Manhattan pixel. The gray-background protruding rows and the white-background non-protruding rows are displayed alternately. In Figure 13, the dashed lines show the lines connecting the pixel centers of some rows. The column spacing is the spacing of a complete pixel. In Figure 13, row 0 is the bottom row of the DMD, and there are N rows from bottom to top.

[0128] By referring to Figures 12 and 13, it can be determined how many pixels are needed in the row and column directions of the diamond pixel arrangement to achieve the same resolution display of the orthogonal image when the input image is an orthogonal image.

[0129] Let M be the number of columns and N be the number of rows of the rhombus pixel arrangement, and let N be the number of pixels that can support the display resolution of px. Taking an image with a resolution of 1920*1080 and an aspect ratio of 16:9 as an example, then combining with equation (4), the following formula can be written: px = M * N = 1920 * 1080 (6)

[0130] From equations (5) and (6), we can obtain the minimum number of pixels required to display an image with a resolution of 1920*1080 using a diamond pixel arrangement, where:

[0131] The number of columns M can be obtained using the following formula: Since pixels appear as integers, rounding up gives the minimum number of columns M = 1358;

[0132] The number of rows N can be obtained using the following formula: Rounding up, we get the minimum number of rows, N = 1528.

[0133] As can be seen, 1358 columns and 1528 rows are the minimum number of rows and columns required for the diamond-shaped pixel arrangement to display a 2K image with a resolution of 1920*1080. It is understood that in other embodiments, the minimum number of rows and columns required for the diamond-shaped pixel arrangement to display images at other resolutions can be calculated in a similar manner.

[0134] Based on the minimum number of rows and columns of the obtained rhombus-shaped pixels, the number of rows and columns can be further increased by even multiples. For example, the number of rows can be increased by a first even number, and the number of columns can be increased by a second even number. Taking the second even number as 2 as an example, one column of pixels can be added to each side of the rhombus-shaped pixel arrangement, so the total number of columns is 1360. Taking the first even number as 8 as an example, that is, 8 rows can be added, so 4 rows of pixels can be added to each side of the rhombus-shaped pixel arrangement, so the total number of rows is 1536, ensuring that there is sufficient margin in the effective display area.

[0135] Accordingly, the row and column layout of a DMD capable of displaying images with a resolution of 1920*1080 (2K) and satisfying a diamond pixel arrangement format with an aspect ratio of 16:9 is shown in Figure 14. In Figure 14, the diamond pixel arrangement has 1360 columns and 1536 rows. However, when the input image is a 1920*1080 resolution orthogonal image (Manhattan image), the image has 1920 columns and 1080 rows. Therefore, the 1920 columns of pixels in the image cannot be mapped one-to-one with the 1360 columns of pixels in the diamond arrangement, nor can the 1080 rows of pixels in the image be mapped one-to-one with the 1536 rows of pixels in the diamond arrangement. In other words, the pixels in the input orthogonally arranged image do not match the pixels in the diamond pixel arrangement DMD and cannot be mapped one-to-one to the output diamond pixel arrangement DMD.

[0136] One-to-one mapping means that when the number of rows and columns of the input Manhattan image is equal to the number of rows and columns of the diamond pixel arrangement, the pixels of the Manhattan image are mapped one-to-one to the diamond pixels of the DMD for output. When the image is sampled and output, the sampling of the pixels of the Manhattan image is normally loaded onto the DMD and directly mapped onto the diamond pixels for output. That is, after the original resolution is input, each input pixel is directly mapped to the diamond pixels of the DMD. As shown in Figure 15, the input video content is a 4*4 Manhattan arrangement of pixels as shown in Figure 15(1). The diamond pixel arrangement of the DMD is also a 4*4 arrangement as shown in Figure 15(2). Therefore, the input 4*4 pixels only need to be normally loaded onto the DMD as shown in Figure 15(2). Each pixel is directly mapped one-to-one to the 4*4 diamond DMD micromirror arrangement as shown in Figure 15(3) to display the input video.

[0137] However, when the number of rows and columns of the input Manhattan image is different from the number of rows and columns of the diamond pixel arrangement, such as when the number of columns of the Manhattan image is greater than the number of columns of the diamond pixel arrangement, and the number of rows of the Manhattan image is less than or equal to the number of rows of the diamond pixel arrangement, it is difficult to directly perform one-to-one mapping output.

[0138] Therefore, it is necessary to determine the correspondence between the image pixels of the image signal and the micromirrors of the digital micromirror device (DMM) when the image pixel arrangement is orthogonal and the digital micromirror device (DMM) pixel arrangement is diamond-shaped. This correspondence is the second one mentioned above. Alternatively, it is necessary to map the image signal to the micromirrors of the DMM after pixel scaling and dimensionality reduction sampling. The following example illustrates how to map the image signal to the micromirrors of the DMM after pixel scaling and dimensionality reduction sampling.

[0139] As shown in step S703 above, when the image pixels are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, the image signal is pixel-scaled using a preset scaling ratio to obtain the pixel-scaled image signal.

[0140] The preset scaling ratio is the scaling ratio of the pixels of the image signal. By scaling the pixels of the image signal using the preset scaling ratio, the number of pixels in the image signal can be adjusted.

[0141] The preset scaling ratio can be determined based on the distance between two adjacent rhombus pixels in the rhombus pixel arrangement, including the horizontal distance and the diagonal distance. In one example, the preset scaling ratio is the ratio of the horizontal distance (also known as the horizontal distance, as shown in Figure 10(2) 1.414P) between two adjacent rhombus pixels to the diagonal distance (as shown in Figure 10(2) P). In some examples, the preset scaling ratio may include...

[0142] After obtaining the pixel-scaled image signal, the resolution of the orthogonally arranged input image signal is 1920*1080, and the preset scaling ratio is [missing value]. For example, the image signal after pixel scaling is still orthogonally arranged, but the number of column pixels increases, and the number of columns becomes... As the number of pixels per column and row increases, the number of rows becomes The row count is 2716 columns after rounding up, and the column count is 1528.

[0143] Accordingly, in some embodiments, the method further includes:

[0144] The product of the preset scaling ratio and the number of rows of pixels in the received image signal is rounded up to obtain the number of rows of pixels in the orthogonally arranged image signal after pixel scaling.

[0145] The product of the preset scaling ratio and the number of column pixels of the received image signal is rounded up to obtain the number of column pixels of the orthogonally arranged image signal after pixel scaling.

[0146] Therefore, after rounding up, we can obtain the integer number of rows and columns after pixel scaling, which facilitates the pixel division of the orthogonal input image. Taking the above-mentioned orthogonal image as 1920*1080 and the preset scaling ratio as... For example, after rounding up, the number of columns of column pixels becomes 2716, and the number of rows of row pixels becomes 1528.

[0147] As seen in the examples above, if the image resolution of the received image signal matches the order of magnitude of the number of pixels in the diamond pixel arrangement, then the number of rows in the diamond pixel arrangement is greater than the number of rows of the image pixels in the received image signal, and the number of columns in the diamond pixel arrangement is less than the number of columns of the image pixels in the received image signal. Furthermore, the smaller of the number of rows and columns in the pixel-scaled image signal is the same as the larger of the minimum number of rows and minimum number of columns when the resolution of the image displayed by the diamond pixel arrangement is equal to the resolution of the image signal. For example, the smaller of the number of rows (1528) and columns (2716) in the pixel-scaled image signal is 1528. As mentioned above, the larger of the minimum number of rows (1528) and minimum number of columns (1358) when the diamond pixel arrangement displays an image with a resolution of 1920*1080 is 1528. However, the larger of the number of rows and columns in the pixel-scaled image signal is different from the smaller of the minimum number of rows and minimum number of columns when the resolution of the image displayed by the diamond pixel arrangement is equal to the resolution of the image signal. In some examples, the number of rows in the pixel-scaled image signal is the same as the minimum number of rows when the resolution of the image displayed by the diamond pixel arrangement is the same as the minimum number of rows when the resolution of the image signal is the same. In some examples, the ratio of the number of rows in the diamond pixel arrangement to the number of rows of the image pixels in the received image signal is the same as the ratio of the number of columns of the image pixels in the received image signal to the number of columns in the diamond pixel arrangement.

[0148] Among them, matching the order of magnitude of pixel count means that the number of pixels corresponding to the image resolution are in the same order of magnitude. For example, 1920*1080 and 1358*1528 are both in the 200,000 pixel range, so the pixel count is matched.

[0149] The smaller of the number of rows and columns in the orthogonally arranged image signal after pixel scaling is the same as the larger of the minimum number of rows and columns when the resolution of the image signal is the same as that of the diamond pixel arrangement. This ensures that the number of pixels in at least one of the row and column directions of the pixel-scaled image signal is the same as the number of pixels in that direction when the resolution of the image signal is the same as that of the diamond pixel arrangement. This simplifies the scaling process and helps in determining the mapping relationship or performing dimensionality reduction sampling (the specific dimensionality reduction sampling process is described in the following embodiments).

[0150] In some embodiments, if the image resolution of the received image signal matches the order of magnitude of the number of pixels in the diamond pixel arrangement, then the larger of the number of rows and columns in the pixel-scaled image signal is twice the smaller of the minimum number of rows and columns when the resolution of the image displayed by the diamond pixel arrangement is equal to the resolution of the image signal. For example, if the larger of the number of rows (1528) and columns (2716) in the pixel-scaled image signal is 2716, and the smaller of the minimum number of rows and columns when the resolution of the image displayed by the diamond pixel arrangement is equal to the resolution of the image signal is 1358, then 2716 is twice 1538. In some examples, the number of columns in the pixel-scaled image signal is twice the minimum number of columns when the resolution of the image displayed by the diamond pixel arrangement is equal to the resolution of the image signal.

[0151] The larger of the number of rows and columns in the image signal after pixel scaling is twice the smaller of the minimum number of rows and columns when the resolution of the image signal is the same as that of the diamond pixel arrangement. This ensures that the number of pixels in one of the row or column directions of the scaled image signal is an integer multiple of the number of pixels in that direction when the resolution of the image signal is the same as that of the diamond pixel arrangement. This helps to improve the convenience and efficiency of dimensionality reduction sampling.

[0152] As can be seen above, with an input orthogonally arranged image of 1920*1080 and a preset scaling ratio of [missing information], [missing information]. For example, after pixel scaling and rounding up, the number of pixels is 2716*1528. However, as mentioned above, when displaying an image with a resolution of 1920*1080 using a diamond pixel arrangement, the minimum number of columns required for the diamond pixel arrangement is 1358, and the minimum number of rows is 1528, making a one-to-one mapping impossible.

[0153] In the example above, where the image resolution of the image signal is matched to the order of magnitude of the number of pixels in the diamond pixel arrangement, in some embodiments, the method further includes:

[0154] When the resolution of the received image signal does not match the order of magnitude of the number of pixels in the diamond pixel arrangement, the received image signal is decomposed to obtain multiple sub-frame images, where the resolution of each sub-frame image matches the order of magnitude of the number of pixels in the diamond pixel arrangement. After image decomposition, pixel scaling can be performed on each sub-frame pixel using the pixel scaling method described above.

[0155] Taking a received image signal with a resolution of 3840*2160 (4K resolution) and a DMD with 1358*1528 rows and columns of diamond-shaped pixels as an example, by performing image decomposition on the 3840*2160 signal source image, four 1920*1080 subframe images are obtained.

[0156] By decomposing an image signal whose image resolution is not on the same order of magnitude as the number of pixels in a diamond pixel arrangement into multiple sub-frame images whose image resolution is on the same order of magnitude as the number of pixels in a diamond pixel arrangement, pixel scaling and other processing can be performed on the sub-frame images whose pixel order of magnitude matches, so as to facilitate the mapping output of the sub-frame images to the diamond pixel arrangement.

[0157] It is understandable that when an image signal is decomposed into multiple sub-frame images, the multiple sub-frame images can be rapidly and sequentially displayed using a DMD. For example, if the signal source image is decomposed into four sub-frame images, these four sub-frame images can be sequentially and rapidly mapped onto the diamond pixel arrangement of the DMD for vibration display, thereby enabling the resolution of the image displayed by the DMD to be the same as the resolution of the image signal.

[0158] As can be seen, pixel scaling of the image signal essentially involves re-dividing the image signal into pixels while maintaining its original image size. Since the original image signal has the same size as the orthogonally arranged image signal after pixel scaling, the only difference is the number of pixels. The number of pixels in the orthogonally arranged image signal after pixel scaling is greater than the number of pixels in the diamond pixel arrangement. Therefore, as shown in step S704, the pixel-scaled image signal can be downsampled, and control signals for controlling the laser source and driving signals for the digital micromirror device can be generated based on the downsampled image signal to achieve pixel signal mapping output.

[0159] This process can determine the correspondence between the pixels of the orthogonally arranged image signal before pixel scaling and the pixels of the orthogonally arranged image signal after pixel scaling, and then perform dimensionality reduction sampling based on this.

[0160] Since the number of pixels in the pixel-scaled image signal is inconsistent with the number of pixels in the diamond pixel arrangement, it is possible to output the signal of some pixels in the orthogonally arranged pixel-scaled image signal to the pixels in the diamond pixel arrangement for display. Therefore, as described in step S704, the pixel-scaled image signal can be dimensionality-reduced and sampled, and a control signal for controlling the laser light source and a driving signal for the digital micromirror device can be generated based on the dimensionality-reduced image signal.

[0161] Dimensionality reduction sampling refers to partially sampling the signal of each pixel in the image signal after pixel scaling, and only outputting the signal of a portion of the pixels in the orthogonally arranged image signal after pixel scaling.

[0162] By performing dimensionality reduction sampling on the pixel-scaled image signal, the number of pixels in the dimensionality-reduced image signal can be made consistent with the number of diamond pixels in the diamond pixel arrangement, thereby achieving a one-to-one mapping output.

[0163] To ensure that the number of pixels after dimensionality reduction sampling matches the number of pixels in the diamond pixel arrangement for corresponding signal output, in some embodiments, the number of pixels in the dimensionality-reduced image signal is the same as the minimum number of rows and columns required to form the number of pixels when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal. In some examples, the number of rows in the dimensionality-reduced image signal is the same as the minimum number of rows required when the resolution of the image displayed by the diamond pixel arrangement is the same as the minimum number of columns required when the resolution of the image displayed by the diamond pixel arrangement is the same as the minimum number of columns required when the resolution of the received image signal is the same.

[0164] The method of dimensionality reduction sampling of the image signal after pixel scaling is not limited. In some embodiments of this application, dimensionality reduction sampling of the scaled orthogonal image can be achieved by cross-sampling the scaled orthogonal image.

[0165] Cross-sampling refers to sampling two adjacent sampling pixels in the same row with an interval of one column, and sampling pixels in two adjacent rows in the same column with an interval of one row. The sampling points between adjacent rows are staggered, and the sampling points between adjacent columns are also staggered, so that any sampling point and its surrounding adjacent sampling points are arranged in a "diamond" shape.

[0166] Taking an orthogonal image with an image signal of 8*4 as an example, it has 8 columns and 4 rows, as shown in Figure 16(1). When performing cross-sampling, refer to Figure 16(2). Sampling is performed on pixels marked as white, and pixels marked as gray are not sampled. The sampled pixels in row 0 are “10,30,50,70”, the sampled pixels in row 1 are “01,21,41,61”, the sampled pixels in row 2 are “12,32,52,72”, and the sampled pixels in row 3 are “03,23,43,63”. The matching mapping between the arrangement position of the pixels after dimensionality reduction sampling and the arrangement position of the diamond pixels is shown in Figure 16(3). At this time, the pixels after dimensionality reduction sampling can be loaded one by one into the DMD with diamond pixel arrangement to achieve a 1-to-1 mapping to the DMD micromirror for output. That is, the pixels "10,30,50,70,01,21,41,61,12,32,52,72,03,23,43,63" of the 8*4 image signal have a corresponding relationship with the pixels in the diamond pixel arrangement.

[0167] For an orthogonal image with a resolution of 1920*1080, after pixel scaling and rounding up, the number of pixels is 2716*1528. As mentioned above, when displaying a 1920*1080 image using a diamond pixel arrangement, the minimum number of columns required for the diamond pixel arrangement is 1358, and the minimum number of rows is 1528. Therefore, after cross-sampling, the resolution of the displayed image is 1358*1528, allowing for one-to-one display on the diamond pixel arrangement.

[0168] As mentioned above, during the pixel scaling process, the image region corresponding to one pixel of the received image signal will correspond to one or more pixels in the pixel-scaled image signal after pixel scaling. Conversely, one pixel in the pixel-scaled image signal may correspond to only one pixel of the received image signal, or it may correspond to multiple pixels of the received image signal.

[0169] Referring to Figure 17, taking a 4*3 orthogonal image as an example, if the preset scaling ratio is 1.4, after scaling the 4*3 image signal by pixels and rounding up, the resulting pixel-scaled image signal has 6*5 pixels. As can be seen from Figure 17, pixel 00 in the scaled 6*5 image corresponds only to pixel 00 in the 4*3 image, while pixel 01 in the 6*5 image corresponds to both pixel 00 and pixel 01 in the 4*3 image, and so on.

[0170] Therefore, if a pixel in the pixel-scaled image signal corresponds only to a single pixel in the received image signal, then the pixel value of that single pixel in the received image signal can be used as the pixel value of that pixel in the pixel-scaled image signal. If that pixel in the pixel-scaled image signal is sampled and output into a diamond pixel array, then the pixel value of that single pixel in the received image signal can be used as the pixel value of the corresponding pixel in the diamond pixel array, thereby achieving lossless mapping output of that pixel in the image signal.

[0171] If a pixel in the pixel-scaled image signal corresponds to two or more pixels in the received image signal, then a combined pixel value can be calculated based on the pixel values ​​of the two or more pixels in the received image signal, and this combined pixel value can be used as the pixel value of that pixel in the pixel-scaled image signal.

[0172] There are no restrictions on the method for calculating the overall pixel value. The following examples illustrate several methods.

[0173] In some embodiments, the pixel value of any one of two or more pixels in the received image signal can be used as the composite pixel value. Therefore, the composite pixel value can be determined quickly, simply, and conveniently by choosing any one of these methods.

[0174] In some embodiments, the pixel value of the pixel with the largest mapping ratio to the pixels of the pixel-scaled image signal among two or more pixels of the received image signal can be used as the composite pixel value. This allows the pixel value of the pixel with the largest mapping ratio to be used as the composite pixel value, thus preserving more information from the original pixels of the received image signal and improving the accuracy of the image displayed using the diamond pixel arrangement.

[0175] The mapping ratio refers to the proportion of each pixel in the received image signal to the pixels in the pixel-scaled image signal when the pixels of the pixel-scaled image signal correspond to two or more pixels in the received image signal. Essentially, it can be the proportion of each pixel in the received image signal to the pixels in the pixel-scaled image signal when the pixels of the pixel-scaled image signal correspond to two or more pixels in the received image signal.

[0176] As shown in Figure 17, for pixel 01 (let's call it A) in the 6*5 image obtained after pixel scaling, the mapping ratio of pixel 00 in the 4*3 image to pixel A is 2 / 3, while the mapping ratio of pixel 01 in the 4*3 image to pixel A is 1 / 3. Therefore, the pixel value of pixel 00 in the 4*3 image can be used as the pixel value of pixel 01 in the 6*5 image obtained after pixel scaling, which is also the pixel value of the pixel marked as 01 in the diamond pixel arrangement.

[0177] In some embodiments, the pixel values ​​of two or more pixels in the received image signal can be weighted and summed to obtain a composite pixel value. Therefore, obtaining a composite pixel value by weighting and summing the pixel values ​​of two or more pixels takes into account the pixel values ​​of multiple pixels with mapping relationships, which helps to improve the smoothness of the image signal after dimensionality reduction sampling.

[0178] The weighted summation method is not limited. In some examples, the mapping ratio of the pixels of the received image signal to the pixels of the pixel-scaled image signal can be used as the weighting coefficient of the pixels of the received image signal. The pixel values ​​of two or more pixels of the received image signal are then weighted and summed based on the weighting coefficient. This way, more information of pixels with larger mapping ratios can be retained during the weighted summation, which is more conducive to the accuracy and smoothness of the image signal after dimensionality reduction sampling.

[0179] Taking the example shown in Figure 17, the weighting coefficient of pixel 00 in the 4*3 image can be 2 / 3, while the weighting coefficient of pixel 01 in the 4*3 image can be 1 / 3.

[0180] It is understood that in other embodiments, other methods may be used to calculate the pixel values ​​of two or more pixels in the received image signal to obtain the composite pixel value of the pixel in the dimension-reduced image signal.

[0181] Once the pixel value of the pixel in the image signal after dimensionality reduction sampling is determined (or the combined pixel value mentioned above in the case of two or more pixels corresponding to the received image signal), a control signal for controlling the laser source and a driving signal for the digital micromirror device can be generated based on the pixel value, so that the signal corresponding to the pixel value can be output through the digital micromirror device.

[0182] Based on the above, it can be determined that by scaling the received orthogonally arranged image signal pixel by a preset scaling ratio, the correspondence between the pixels of the received orthogonally arranged image signal and the pixels of the pixel-scaled image signal can be obtained (this can be referred to as the third correspondence in this embodiment). After dimensionality reduction sampling of the pixel-scaled image signal, there is a one-to-one correspondence between the pixels of the dimensionality-reduced image signal and the pixels of the diamond pixel arrangement (this can be referred to as the fourth correspondence in this embodiment). Therefore, based on these two correspondences, the correspondence between the image pixels of the received orthogonally arranged image signal and the diamond pixels of the diamond pixel arrangement (corresponding to the tiny reflective mirrors of the digital micromirror device) can be determined, which is referred to as the second correspondence in this embodiment. Therefore, after obtaining the second correspondence, in the actual projection display process, control signals for controlling the laser light source and driving signals for the digital micromirror device can be generated directly based on the second correspondence and the pixel values ​​of the image pixels of the received orthogonally arranged image signals. Thus, after the second correspondence is determined in advance, there is no need to perform pixel scaling and dimensionality reduction sampling in the actual projection display process, which can improve the efficiency of the projection display.

[0183] Referring to the example shown in Figure 17, the input image signal is a 4*3 orthogonal image with a preset scaling ratio of 1.4. After pixel scaling and rounding up on the 4*3 image signal, the resulting pixel-scaled image signal is a 6*5 orthogonal image. As can be seen from Figure 17, pixel 00 in the resulting 6*5 image corresponds only to pixel 00 in the 4*3 image, while pixel 01 in the 6*5 image corresponds to both pixel 00 and pixel 01 in the 4*3 image, and so on.

[0184] Referring to the above method, to display a 4*3 resolution image, the diamond pixel arrangement needs to have 3*5 rows and columns. Therefore, by cross-sampling the 6*5 image obtained after pixel scaling, it can be determined that pixels 10, 30, 50, 01, 21, 41, etc. in the 6*5 image correspond to pixels in the diamond pixel arrangement. Thus, it can be determined that, as shown in Figure 17, the diamond pixel marked as 10 in the diamond pixel arrangement corresponds to both pixels 00 and 10 in the 4*3 image, the diamond pixel marked as 30 in the diamond pixel arrangement corresponds only to pixel 20 in the 4*3 image, and so on.

[0185] Accordingly, for the example shown in Figure 17, the established second correspondence may include: pixels 00 and 10 in the 4*3 orthogonal image correspond to the rhombus pixel marked as 10 in the rhombus pixel arrangement; pixel 20 in the 4*3 orthogonal image corresponds to the rhombus pixel marked as 30 in the rhombus pixel arrangement; and so on.

[0186] In other examples, the second correspondence can also be determined based on how the pixel values ​​of pixels in the orthogonal image after pixel scaling are calculated.

[0187] Taking the example of taking the pixel value of any one pixel among the pixel values ​​of two or more pixels of the received image signal as the comprehensive pixel value of the corresponding pixel in the pixel-scaled image signal, or taking the pixel value of the pixel with the largest mapping ratio to the pixel of the pixel-scaled image signal among two or more pixels of the received image signal as the comprehensive pixel value of the corresponding pixel in the pixel-scaled image signal, then in the second correspondence relationship including the correspondence between the image pixels of the image signal and the micro-reflective mirror of the digital micromirror device, one micro-reflective mirror may correspond to the image pixels of multiple image signals.

[0188] Taking the example shown in Figure 17, taking the pixel value of the pixel with the largest mapping ratio to the pixel of the pixel-scaled image signal among two or more pixels of the received image signal as an example, the established second correspondence may include: pixel 00 in the 4*3 orthogonal image corresponds to the diamond pixel marked 01 in the diamond pixel arrangement, pixel 20 in the 4*3 orthogonal image corresponds to the diamond pixel marked 30 in the diamond pixel arrangement, and so on.

[0189] As described above, in the case where the established second correspondence is to directly map the image pixels of the received orthogonally arranged image signal to the rhombus pixels of the rhombus pixel arrangement, control signals for controlling the laser source and driving signals for the digital micromirror device can be directly generated based on the pixel values ​​of the image pixels of the received orthogonally arranged image signal.

[0190] In some examples, the second correspondence may further include: the calculation method of the image pixels of the accessed image signal. This calculation method may be the method for calculating the pixel value of the image pixel when it corresponds to a pixel arranged in a diamond pattern; in some examples, this calculation method can be represented by a calculation formula.

[0191] As described above, the diamond pixel in the diamond pixel arrangement can correspond to only one pixel in the input image signal. For example, the diamond pixel marked as 30 in Figure 17 corresponds to only pixel 20 in the 4*3 image. In this case, the calculation method can be equal to or equal to the pixel value of one pixel in the input image signal, so as to directly assign the amplitude to the corresponding diamond pixel, thereby generating the control signal for controlling the laser light source and the driving signal for the digital micromirror device.

[0192] When a rhombus pixel in a rhombus pixel arrangement corresponds to two or more pixels in the received image signal, the calculation method in the second correspondence can be determined based on the above-described method of calculating the comprehensive pixel value. For example, by weighted summing the pixel values ​​of two or more pixels in the received image signal to obtain the comprehensive pixel value of the corresponding pixel in the pixel-scaled image signal, pixels 00 and 10 in the 4*3 orthogonal image shown in Figure 17 correspond to the rhombus pixel marked as 10 in the rhombus pixel arrangement. Therefore, the second correspondence can include this weighted summation calculation method.

[0193] Accordingly, based on the second correspondence between the image pixels of the received orthogonally arranged image signal and the rhombus pixels of the rhombus pixel arrangement (corresponding to the tiny reflective mirrors of the digital micromirror device), when performing mapping output, control signals for controlling the laser source and driving signals for the digital micromirror device can be directly generated based on the pixel values ​​of the image pixels of the received orthogonally arranged image signal. Alternatively, after calculation based on the calculation method in the second relationship, control signals for controlling the laser source and driving signals for the digital micromirror device can be generated based on the calculated values ​​(i.e., the aforementioned comprehensive pixel values). Without the need for pixel scaling and dimensionality reduction sampling, rapid signal mapping output can be achieved.

[0194] Based on the embodiments described above, the following example uses a 1920*1080 orthogonal image as the source signal. Figure 18 illustrates the display control method for displaying a 1920*1080 orthogonal image on a DMD with diamond-shaped pixel arrangement. Figure 19 shows an illustrated example of the display control process. In the following example, the output will be described after pixel scaling and dimensionality reduction sampling.

[0195] Referring to Figures 18 and 19, the display control method includes the following steps:

[0196] Step S1801: Receive orthogonally arranged image signals. In some examples, the orthogonally arranged image signals can be image signals with a resolution of 1920*1080, as shown in Figure 19(1).

[0197] Step S1802: Scale the number of pixels of the orthogonally arranged image signal simultaneously in the horizontal direction H and the vertical direction W. This allows us to obtain an orthogonally arranged image signal with the number of pixels scaled by a factor of 2, thereby enabling pixel scaling processing of the orthogonally arranged image signal.

[0198] This means that the original image size of the entire frame remains unchanged, only the number of pixels is scaled, and the pixels are re-divided, resulting in smaller pixels. The entire frame is scaled simultaneously in both the horizontal (H) and vertical (W) directions. After multiplying, the number of pixels in the horizontal direction of the entire frame image becomes 1 / 3 of the original number. The number of pixels in the column increases by a factor of two, and the number of pixels in the vertical direction also increases to the original value. The number of pixels per row also increases, and the total number of pixels in the entire frame is twice that of the original image. In other words, the original image is divided into smaller and more numerous pixels.

[0199] Taking the received orthogonally arranged 1920*1080 image signal as an example, the image after pixel scaling is still a Manhattan arrangement (orthogonal arrangement). The number of columns increases, and the number of columns becomes 2715.3, which is rounded up to 2716. The number of rows increases, and the number of rows becomes 1527.4, which is rounded up to 1528. That is, the resolution of the whole frame image after pixel scaling becomes 2716*1528. After horizontal and vertical pixel scaling, the scaled orthogonal arrangement is shown in Figure 19(2) and Figure 19(3) respectively. As can be seen from Figure 19, after pixel scaling, the pixels become smaller, the image is divided more finely, and the number of columns and rows increases.

[0200] Step S1803: Perform dimensionality reduction sampling on the orthogonally arranged image signal after pixel scaling.

[0201] When performing dimension reduction sampling on an orthogonally arranged image signal after pixel scaling, cross-sampling can be used. For example, cross-sampling can be performed on a Manhattan 2716*1528 image after pixel scaling, as shown in Figures 19(2) and 19(3). The pixels represented by the gray positions are not sampled, and the pixels represented by the white positions in the sampling image are sampled. The positions of any sampled pixel and its surrounding adjacent sampled pixels are arranged in a "diamond" shape in the Manhattan arrangement.

[0202] Step S1804: Modulate the signal after dimensionality reduction sampling.

[0203] The image signal obtained after dimensionality reduction sampling has a resolution of 1358*1528, which allows it to be directly mapped to the pixel micromirrors of a DMD with a diamond-shaped pixel arrangement. Taking a diamond-shaped pixel arrangement of 1360*1536 as an example, the 1358*1528 subframe image will be displayed within the 1360*1536 effective display area of ​​the DMD. The intersection of the horizontal and vertical center lines of the same pixel is precisely the center point of the diamond-shaped pixel arrangement, and each dimension-reduced pixel corresponds one-to-one with a diamond-shaped pixel, enabling direct mapping. For example, the intersection of the column center line and the row center line of the top left pixel (0,1526) in the Manhattan arrangement is the center point of the rhombus pixel (0,1526). That is, the Manhattan pixel (0,1526) maps to the rhombus pixel (0,1526), ​​the Manhattan pixel (2,1526) maps to the rhombus pixel (1,1526) on the rhombus DMD, the Manhattan pixel (1,1525) maps to the rhombus pixel (0,1525) on the rhombus DMD, and the Manhattan pixel (3,1525) maps to the rhombus pixel (1,1525) on the rhombus DMD, as shown in Figure 19(4). Similarly, the remaining sampled pixels are mapped one-to-one with the pixels in the rhombus arrangement. The positions of the sampled image pixels are matched one-to-one with the positions of the rhombus pixels. Therefore, the original image features are kept unchanged by the restriction and control method described above, ensuring the correctness of the image display.

[0204] Some embodiments of this application also provide a method for displaying a projected image, wherein, referring to FIG20, the method includes the following steps:

[0205] S2001: Receive the image signal and determine the image pixel arrangement of the image signal;

[0206] S2002: When the image pixels are arranged in an orthogonal arrangement and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated according to a preset one-to-one correspondence between the image pixels and the micro-reflective mirrors. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

[0207] S2003: When the image pixel arrangement is orthogonal and the digital micromirror device is arranged in a diamond pixel arrangement, determine the minimum number of columns and the minimum number of rows for displaying the received image signal using a diamond pixel arrangement based on the proportional relationship between the row spacing of adjacent pixels in the orthogonal pixel arrangement and the row spacing of adjacent pixels in the diamond pixel arrangement, as well as the proportional relationship between the column spacing of adjacent pixels in the orthogonal pixel arrangement and the column spacing of adjacent pixels in the diamond pixel arrangement; determine the effective display area for displaying the received image signal using a diamond pixel arrangement based on the minimum number of columns and the minimum number of rows.

[0208] Based on this embodiment, when the image pixels of the received image signal are arranged orthogonally and the micro-reflective mirrors of the digital micromirror device (DMD) for projection display are arranged in an orthogonal pixel arrangement, direct mapping output can be performed. When the image pixels of the received image signal are arranged orthogonally and the micro-reflective mirrors of the DMD for projection display are arranged in a diamond pixel arrangement, the minimum number of columns and the minimum number of rows of the received image signal for display in a diamond pixel arrangement are determined based on the proportional relationship between the row spacing of adjacent pixels in the orthogonal pixel arrangement and the row spacing of adjacent pixels in the diamond pixel arrangement, as well as the proportional relationship between the column spacing of adjacent pixels in the orthogonal pixel arrangement and the column spacing of adjacent pixels in the diamond pixel arrangement. This allows for the determination of the number of rows and columns of pixels in the received image signal for display in a diamond pixel arrangement, and the determination of the effective display area of ​​the received image signal for display in a diamond pixel arrangement. Therefore, the number of rows and columns of pixels in the DMD display when the input signal source is an orthogonal image can be determined as needed. For devices displaying fixed resolutions, such as display devices with orthogonally arranged 2K or 4K resolution video sources as input signal sources, the number of diamond-shaped pixels arranged in the DMD of the display device can be configured based on a determined minimum number of columns and minimum number of rows, so that the number of diamond-shaped pixels in the DMD can be configured as needed.

[0209] The method for determining the minimum number of columns and the minimum number of rows for displaying the received image signal using a diamond pixel arrangement, based on the proportional relationship between the row spacing between adjacent pixels in an orthogonal pixel arrangement and the row spacing between adjacent pixels in a rhombus pixel arrangement, and the proportional relationship between the column spacing between adjacent pixels in an orthogonal pixel arrangement and the column spacing between adjacent pixels in a rhombus pixel arrangement, can be the same as the method in the above embodiment. For example, when the input signal source image is an orthogonal image of 1920*1080, based on equation (5), the minimum number of columns for displaying an image with a resolution of 1920*1080 using a rhombus pixel arrangement can be determined to be 1358 and the minimum number of rows can be determined to be 1528.

[0210] In some embodiments, the method further includes:

[0211] When the image resolution of the received image signal does not match the order of magnitude of the number of pixels that can be displayed by the diamond pixel arrangement, the received image signal is decomposed to obtain multiple sub-frame images.

[0212] At this point, the minimum number of columns and the minimum number of rows can be determined as the number of rows and columns of pixels in the subframe image displayed by the diamond pixel arrangement. In this case, determining the effective display area of ​​the received image signal based on the minimum number of columns and the minimum number of rows includes:

[0213] The effective display area of ​​the image signal for the subframe image is determined based on the minimum number of columns and the minimum number of rows.

[0214] Among them, matching the order of magnitude of pixel count means that the number of pixels corresponding to the image resolution are in the same order of magnitude. For example, 1920*1080 and 1358*1528 are both in the 200,000 pixel range, so the pixel count is matched.

[0215] The image resolution of the received image signal does not match the order of magnitude of the number of pixels that can be displayed by the diamond pixel arrangement. To decompose the received image signal into multiple sub-frame images means to decompose the received image signal into multiple sub-frame images whose number of pixels matches the order of magnitude of the number of pixels that can be displayed by the diamond pixel arrangement.

[0216] Taking a 4K resolution orthogonal image with a received image signal of 3840*2160 and a DMD with a diamond pixel arrangement of 1358*1528 rows and columns as an example, by performing image decomposition on the 3840*2160 signal source image, four decomposed images of 1920*1080 are obtained.

[0217] After obtaining multiple sub-frame images after decomposition, these sub-frame images can be vibrated separately by vibrating a galvanometer. By utilizing the persistence of vision, the visual effect of displaying the image at a 4K resolution of 3840*2160 can be achieved.

[0218] In some embodiments, the number of rows of pixels in a diamond-shaped pixel arrangement is determined by rounding up the minimum row number and adding a first even number, and the number of columns of pixels in a diamond-shaped pixel arrangement is determined by rounding up the minimum column number and adding a second even number. In some examples, the number of rows of pixels in a diamond-shaped pixel arrangement is the number of rows rounded up and adding a first even number; the number of columns of pixels in a diamond-shaped pixel arrangement is the number of columns rounded up and adding a second even number.

[0219] In some embodiments, the first even number is greater than the second even number.

[0220] In some embodiments, the first even number includes 8, and the second even number includes 2.

[0221] In some embodiments, the image resolution of the received image signal includes at least one of 1920*1080 and 3840*2160.

[0222] In some embodiments, the aspect ratio of the received image signal includes 16:9;

[0223] In some embodiments, the aspect ratio of an image displayed using a diamond pixel arrangement includes 16:9.

[0224] The implementation of the projection screen display method in this embodiment can be the same as that in the projection screen display method in the above embodiments, and will not be described again here.

[0225] In some embodiments of this application, a laser projection device is also provided. Referring to FIG3, the laser projection device includes: a display panel 200 and a system motherboard 300. The display panel 200 includes a main control circuit 240, an algorithm processing circuit 241, and a digital micromirror device.

[0226] The algorithm processing circuit 241 is configured as follows:

[0227] Receive image signals from system motherboard 300;

[0228] When the image pixels are arranged orthogonally and the tiny reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, the received image signal is output.

[0229] When the image pixels of the image signal are arranged orthogonally and the digital micromirror devices are arranged in a diamond pixel arrangement, a second correspondence relationship matching the image resolution of the image signal is obtained, and an image signal is output based on the received image signal and the second correspondence relationship. The second correspondence relationship is determined according to the proportional relationship between the row spacing between the orthogonally arranged micromirrors and the row spacing between the diamond-arranged micromirrors, and the proportional relationship between the column spacing between the orthogonally arranged micromirrors and the column spacing between the diamond-arranged micromirrors. One micromirror corresponds to one or more image pixels.

[0230] The main control circuit 240 is configured to receive the image signal output by the algorithm processing circuit 241, generate a control signal to control the laser source and a drive signal to the digital micromirror device. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated into a projection beam after passing through the digital micromirror device and is directed toward the projection lens.

[0231] In some embodiments of this application, a laser projection device is also provided. Referring to FIG3, the laser projection device includes: a display panel 200 and a system motherboard 300. The display panel 200 includes a main control circuit 240, an algorithm processing circuit 241, and a digital micromirror device.

[0232] The algorithm processing circuit 241 is configured as follows:

[0233] Receive image signals;

[0234] When the image pixels of the image signal are arranged in an orthogonal arrangement, and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, the received image signal is output.

[0235] When the image pixels of the image signal are arranged orthogonally and the digital micromirror device is arranged in a diamond pixel arrangement, the image signal is pixel scaled using a preset scaling ratio to obtain a pixel-scaled image signal. After dimensionality reduction sampling of the pixel-scaled image signal, the dimensionality-reduced image signal is output. The ratio of the number of image pixels in the pixel-scaled image signal to the number of image pixels in the image signal before pixel scaling is the square of the preset scaling ratio. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement.

[0236] The main control circuit 240 is configured to receive the image signal output by the algorithm processing circuit 241, generate a control signal to control the laser source and a drive signal to the digital micromirror device. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated into a projection beam after passing through the digital micromirror device and is directed toward the projection lens.

[0237] The processing method of the algorithm processing circuit 241 for the received image signal can be the same as that in the above-described projection display method embodiment, and will not be described in detail here.

[0238] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0239] In some embodiments, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the display control method for the digital micromirror device as described in any of the embodiments above.

[0240] In some embodiments, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the display control method for a digital micromirror device as described in any of the embodiments above.

[0241] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0242] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0243] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for displaying a projected image, wherein, The method includes: Receive image signals and determine the image pixel arrangement of the image signals; When the image pixels are arranged orthogonally and the digital micromirror device is arranged in a diamond pixel arrangement, the image signal is pixel-scaled using a preset scaling ratio to obtain a pixel-scaled image signal. The ratio of the number of image pixels in the pixel-scaled image signal to the number of image pixels in the image signal before pixel scaling is the square of the preset scaling ratio. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement. Dimensionality reduction sampling is performed on the pixel-scaled image signal. Based on the image signal after dimensionality reduction sampling, a control signal for controlling the laser source and a driving signal for the digital micromirror device are generated. The control signal is configured to control the laser source to emit a laser beam, and the driving signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

2. A method for displaying a projected image, wherein, The method includes: Receive image signals and determine the image pixel arrangement of the image signals; When the image pixels are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, a second correspondence relationship matching the image resolution of the image signal is obtained. The second correspondence relationship is the correspondence relationship between the image pixels of the image signal and the micromirrors of the digital micromirror device. The second correspondence relationship is determined based on the proportional relationship between the row spacing between the orthogonally arranged micromirrors and the row spacing between the diamond-arranged micromirrors, and the proportional relationship between the column spacing between the orthogonally arranged micromirrors and the column spacing between the diamond-arranged micromirrors. In this case, one micromirror corresponds to one or more image pixels. Based on the second correspondence, a control signal for controlling the laser source and a drive signal for the digital micromirror device are generated. The control signal is configured to control the laser source to emit a laser beam, and the drive signal is configured to drive the digital micromirror device. The laser beam is modulated by the digital micromirror device into a projection beam and directed towards the projection lens.

3. The method according to claim 2, wherein, The method further includes: The third correspondence between the pixels of the received orthogonally arranged image signal and the pixels of the pixel-scaled image signal after the received image signal has been pixel-scaled based on a preset scaling ratio is obtained. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent rhombus pixels in the rhombus pixel arrangement. Obtain the fourth correspondence between the pixels of the dimension-reduced image signal after dimensionality reduction sampling and the tiny reflective mirrors of the digital micromirror device; Based on the third and fourth correspondences, the second correspondence between the image pixels of the received image signal and the micro-reflective mirrors of the digital micromirror device is obtained.

4. The method according to claim 2 or 3, wherein, The second correspondence also includes: the method for calculating the pixel value of the image pixel when the image pixel of the received image signal is mapped to the micro-reflective mirror of the digital micromirror device.

5. The method according to any one of claims 1 to 3, wherein, It also includes at least one of the following: First item: The method further includes: When the image resolution of the received image signal is on the same order of magnitude as the number of pixels in the diamond pixel arrangement, the number of rows in the diamond pixel arrangement is greater than the number of rows of image pixels in the received image signal, and the number of columns in the diamond pixel arrangement is less than the number of columns of image pixels in the received image signal; Second item: The ratio of the number of rows of the diamond-shaped pixel arrangement to the number of rows of the image pixels in the received image signal is the same as the ratio of the number of columns of the image pixels in the received image signal to the number of columns of the diamond-shaped pixel arrangement.

6. The method according to claim 1 or 3, wherein, It also includes at least one of the following: First item: The method further includes: When the image resolution of the received image signal matches the order of magnitude of the number of pixels in the diamond pixel arrangement, the smaller of the number of rows and columns in the pixel-scaled image signal is the same as the larger of the minimum number of rows and columns when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the image signal, and the larger of the number of rows and columns in the pixel-scaled image signal is different from the smaller of the minimum number of rows and columns when the resolution of the image displayed by the diamond pixel arrangement is the resolution of the image signal. Second item: The number of pixels in the image signal after dimensionality reduction sampling is the same as the number of pixels formed in the minimum number of rows and columns required when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal. Third item: The step of dimensionality reduction sampling of the scaled orthogonally arranged image includes: The scaled image signal is sampled with a column spacing between two adjacent pixels in the same row, and with a row spacing between two adjacent rows in the same column. Fourth item: The method further includes: If a pixel in the pixel-scaled image signal corresponds to only one pixel in the received image signal, the pixel value of the pixel in the received image signal is used as the pixel value of the pixel-scaled image signal. Fifth item: The method further includes: When a pixel in the pixel-scaled image signal corresponds to two or more pixels in the received image signal, a composite pixel value is calculated based on the pixel values ​​of the two or more pixels in the received image signal, and the composite pixel value is used as the pixel value of the pixel in the pixel-scaled image signal.

7. The method according to claim 6, wherein, The number of rows of pixels in the dimension-reduced image signal is the same as the minimum number of rows when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal, and the number of columns of pixels in the dimension-reduced image signal is the same as the minimum number of columns when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal.

8. The method according to claim 6, wherein, The calculation of the combined pixel value based on the pixel values ​​of two or more pixels in the received image signal includes any one of the following: The pixel value of any one of two or more pixels in the received image signal is taken as the composite pixel value. The pixel value of the pixel with the largest mapping ratio to the pixels of the pixel-scaled image signal among two or more pixels of the received image signal is taken as the composite pixel value; or The weighted sum of the pixel values ​​of two or more pixels in the received image signal is used to obtain the combined pixel value.

9. The method according to claim 8, wherein, The method further includes: The mapping ratio of the pixels of the received image signal to the pixels of the pixel-scaled image signal is used as the weighting coefficient of the pixels of the received image signal.

10. The method according to claim 1 or 3, wherein, Pixel scaling of image signals based on a preset scaling ratio includes: The product of the preset scaling ratio and the number of rows of pixels in the received image signal is rounded up to obtain the number of rows of pixels in the orthogonally arranged image signal after pixel scaling. The product of the preset scaling ratio and the number of column pixels of the received image signal is rounded up to obtain the number of column pixels of the orthogonally arranged image signal after pixel scaling.

11. The method according to any one of claims 1 to 3, wherein, The method further includes: When the image resolution of the received image signal matches the order of magnitude of the number of pixels in the diamond pixel arrangement, the received image signal is decomposed to obtain multiple sub-frame images, and the resolution of each sub-frame image matches the order of magnitude of the number of pixels in the diamond pixel arrangement.

12. The method of claim 11, comprising: Vibration is sequentially applied to multiple subframe images.

13. A laser projection device, comprising: The display board and the system motherboard, wherein the display board includes a main control circuit, an algorithm processing circuit, and a digital micromirror device; The algorithm processing circuit is configured as follows: Receive image signals from the system motherboard; When the image pixels of the image signal are arranged in an orthogonal arrangement, and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, the received image signal is output. When the image pixels of the image signal are arranged orthogonally and the digital micromirror device is arranged in a diamond pixel arrangement, the image signal is pixel-scaled using a preset scaling ratio to obtain a pixel-scaled image signal. After dimensionality reduction sampling of the pixel-scaled image signal, the dimensionality-reduced image signal is output. The ratio of the number of image pixels in the pixel-scaled image signal to the number of image pixels in the image signal before pixel scaling is the square of the preset scaling ratio. The preset scaling ratio is determined based on the lateral distance and diagonal distance between two adjacent diamond pixels in the diamond pixel arrangement. The main control circuit is configured to receive the image signal output by the algorithm processing circuit, generate a control signal for controlling the laser source and a drive signal for the digital micromirror device. The control signal is used to control the laser source to emit a laser beam, and the drive signal is used to drive the micromirror pixels of the digital micromirror device to flip. After passing through the digital micromirror device, the laser beam is modulated into a projection beam and directed towards the projection lens.

14. The laser projection device according to claim 13, wherein, When the image resolution of the received image signal is on the same order of magnitude as the number of pixels in the diamond pixel arrangement, the number of rows in the diamond pixel arrangement is greater than the number of rows of image pixels in the received image signal, and the number of columns in the diamond pixel arrangement is less than the number of columns of image pixels in the received image signal.

15. The laser projection device according to claim 13, wherein, The ratio of the number of rows of the diamond-shaped pixel arrangement to the number of rows of the image pixels in the received image signal is the same as the ratio of the number of columns of the image pixels in the received image signal to the number of columns of the diamond-shaped pixel arrangement.

16. The laser projection device according to claim 13, wherein, When the image resolution of the received image signal matches the order of magnitude of the number of pixels in the diamond pixel arrangement, the smaller of the number of rows and columns in the pixel-scaled image signal is the same as the larger of the minimum number of rows and columns when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the image signal, and the larger of the number of rows and columns in the pixel-scaled image signal is different from the smaller of the minimum number of rows and columns when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the image signal.

17. The laser projection device according to claim 13, wherein, The number of pixels in the image signal after dimensionality reduction sampling is the same as the number of pixels formed in the minimum number of rows and columns required when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal.

18. The laser projection device according to claim 13, wherein: If a pixel in the pixel-scaled image signal corresponds to only one pixel in the received image signal, the pixel value of the pixel in the received image signal is used as the pixel value of the pixel-scaled image signal. When a pixel in the pixel-scaled image signal corresponds to two or more pixels in the received image signal, a composite pixel value is calculated based on the pixel values ​​of the two or more pixels in the received image signal, and the composite pixel value is used as the pixel value of the pixel in the pixel-scaled image signal.

19. The laser projection device according to claim 18, wherein, The number of rows of pixels in the dimension-reduced image signal is the same as the minimum number of rows when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal, and the number of columns of pixels in the dimension-reduced image signal is the same as the minimum number of columns when the resolution of the image displayed by the diamond pixel arrangement is the same as the resolution of the received image signal.

20. A laser projection device, comprising: The display board and system motherboard, the display board includes the main control circuit, algorithm processing circuit and digital micromirror device, wherein; The algorithm processing circuit is configured as follows: Receive image signals from the system motherboard; When the image pixels of the image signal are arranged in an orthogonal arrangement, and the micro-reflective mirrors of the digital micromirror device are arranged in an orthogonal pixel arrangement, the received image signal is output. When the image pixels of the image signal are arranged in an orthogonal arrangement and the digital micromirror device is arranged in a diamond pixel arrangement, a second correspondence relationship matching the image resolution of the image signal is obtained, and an image signal is output based on the received image signal and the second correspondence relationship. The second correspondence relationship is determined according to the proportional relationship between the row spacing between the orthogonally arranged micromirrors and the row spacing between the diamond-arranged micromirrors, and the proportional relationship between the column spacing between the orthogonally arranged micromirrors and the column spacing between the diamond-arranged micromirrors. One micromirror corresponds to one or more image pixels. The main control circuit is configured to receive the image signal output by the algorithm processing circuit, generate control signals to control the laser source and drive signals to the digital micromirror device. The control signals are used to control the laser source to emit a laser beam, and the drive signals are used to drive the digital micromirror device. The laser beam is modulated into a projection beam after passing through the digital micromirror device and is directed towards the projection lens.

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