Projection display device and method

Abstract

Embodiments of the present application relate to display technology, and provide a projection display device and method. The projection display device comprises: an image processing unit, configured to determine the current scenario, and if the current scenario is a first scenario, generate, by means of a phase modulation channel in the image processing unit on the basis of an image signal, a first signal and a second signal that are synchronized with each other, wherein the first signal is used for representing the image content of an image frame of the image signal, and the second signal is used for representing the brightness of at least one partition in the image frame of the image signal; a display driving control unit, configured to process the first signal to obtain a first amplitude modulation driving signal; a display image phase execution unit, configured to process the second signal to obtain a phase modulation driving signal; and an imaging display unit, configured to perform imaging display on the basis of the first amplitude modulation driving signal and the phase modulation driving signal. The device provided by the present application improves the dynamic contrast of the projection display device.

Description

Projection display device and method

[0001] This application claims priority to Chinese Patent Application No. 202411356075.3, filed on September 26, 2024, entitled “Projection display device and method”, and Chinese Patent Application No. 202411323868.5, filed on September 23, 2024, entitled “Projection display device”, the contents of both of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to display technology. More specifically, embodiments of the present application relate to a projection display device and method. BACKGROUND

[0003] From the product technology development trend of display devices, users have increasingly high requirements for the brightness, contrast, definition, and color of display devices.

[0004] For a projection display device, how to improve the contrast of the projection display device is a technical problem to be solved. SUMMARY

[0005] Embodiments of the present application provide a projection display device and method to improve the dynamic contrast of a projection display image.

[0006] In a first aspect, embodiments of the present application provide a projection display device, the projection display device comprising:

[0007] a multimedia processing unit configured to receive an image signal of a signal source;

[0008] an image processing unit connected to the multimedia processing unit, configured to determine a current scene, and if the current scene is a first scene, generate a first signal and a second signal that are mutually synchronized according to the image signal through a phase modulation channel in the image processing unit; the first signal is used to represent image content of an image frame of the image signal, and the second signal is used to represent brightness of at least one partition in the image frame of the image signal;

[0009] a display driving control unit connected to the image processing unit, configured to process the first signal to obtain a first amplitude modulation driving signal;

[0010] a display image phase execution unit connected to the image processing unit, configured to process the second signal to obtain a phase modulation driving signal;

[0011] An imaging display unit, connected with the display driving control unit and the display image phase performing unit, is configured to perform imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal.

[0012] In a second aspect, the embodiments of the present application provide a projection display method, comprising:

[0013] receiving an image signal of a signal source;

[0014] determining a current scene, and if the current scene is a first scene, generating a first signal and a second signal which are mutually synchronized according to the image signal; the first signal is used to represent image content of an image frame of the image signal, and the second signal is used to represent brightness of at least one partition in the image frame of the image signal;

[0015] processing the first signal to obtain a first amplitude modulation driving signal;

[0016] processing the second signal to obtain a phase modulation driving signal;

[0017] performing imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art descriptions. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0019] Fig. 1 is a structural schematic diagram of a projection display device disclosed by the embodiments of the present application;

[0020] Fig. 2 is a projection imaging light path principle diagram of a projection display device disclosed by the embodiments of the present application;

[0021] Fig. 3 is a structural schematic diagram of a phase light modulation device disclosed by the embodiments of the present application;

[0022] Fig. 4 is an application scene diagram of a projection display device disclosed by the embodiments of the present application;

[0023] Fig. 5 is a circuit control schematic diagram of a projection display device disclosed by the embodiments of the present application;

[0024] Fig. 6 is a flow schematic diagram one of a projection display method provided by the present application;

[0025] Fig. 7a is a structural schematic diagram of an image signal system of a projection display device provided by the present application;

[0026] Fig. 7b is a structure diagram of a multimedia processing unit in an image signal system of a projection display device according to the present application;

[0027] Fig. 7c is a structure diagram of an image processing unit in an image signal system of a projection display device according to the present application;

[0028] Fig. 7d is a structure diagram of a display driving control unit in an image signal system of a projection display device according to the present application;

[0029] Fig. 7e is a structure diagram of a display image phase executing unit in an image signal system of a projection display device according to the present application;

[0030] Fig. 7f is a structure diagram of an imaging display unit in an image signal system of a projection display device according to the present application;

[0031] Fig. 8 is a flow diagram of refreshing of each primary color component of an image pixel in a projection display method according to the present application;

[0032] Fig. 9 is a flow diagram of a projection display control method according to an embodiment of the present application;

[0033] Fig. 10 is a diagram of timing signals of each color channel according to an embodiment of the present application;

[0034] Fig. 11 is a diagram of a corresponding relationship between a phase light modulation assembly and a modulation sequence of RGB timing signals according to an embodiment of the present application;

[0035] Fig. 12 is a structure diagram of a phase light modulation assembly according to an embodiment of the present application;

[0036] Fig. 13 is a flow diagram of a projection display method according to the present application;

[0037] Fig. 14 is a time delay diagram of a processing unit in an image signal system of a projection display device according to the present application;

[0038] Fig. 15 is a flow diagram of a projection display method according to the present application. DETAILED DESCRIPTION

[0039] In order to make the objectives, implementation manners and advantages of the present application clearer, the following will clearly and completely describe exemplary embodiments of the present application with reference to the accompanying drawings. Obviously, the described exemplary embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0040] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the implementation described next, and is not intended to limit the implementation of the application. Unless otherwise stated, these terms should be understood according to their ordinary and general meaning.

[0041] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not have to be limited to the clearly listed components, but can include other components not clearly listed or inherent to these products or devices.

[0042] The display device provided by the embodiments of the present application can have various implementation forms, for example, can be a television, a smart television, a laser projection display device, a monitor, an electronic bulletin board, an electronic table, etc.

[0043] In modern projection display technology, displaying an image or video with improved contrast through a projection display device has become one of the key functions of the projection display device. The contrast of an image or video refers to the difference between the brightest and darkest parts of the image or video.

[0044] Due to the characteristics of the light source form, the projection display device cannot directly control the luminance and light-emitting time of different partitions by adjusting the luminance of the backlight in the backlight partition, like a liquid crystal television, to display an image or video with improved contrast. For example, for a laser projection display device, the light-emitting and display principle is quite different from that of a liquid crystal television. The laser projection display device uses laser as a light source, and the light source is always on during the boot process. The light source emits in the form of a whole beam, so it cannot be controlled by partition to display an image or video with improved contrast.

[0045] With the development of light modulation technology, the current projection display device can use a phase light modulation device. The phase light modulation device can modulate the light signal emitted by the light source using the principle of light diffraction, ultimately achieving the effect of partitioning control of brightness, that is, the purpose of displaying an image or video with improved contrast. The phase light modulation component is usually installed between the light source and the amplitude light modulation component. In order to display an image or video with improved contrast, the projection display device needs to modulate the light signals of different color channels emitted by the light source through the phase light modulation component and the amplitude light modulation component to realize the adjustment of the intensity distribution of the light source, so that the projection display device can adjust the brightness of the local area of the image or video to display an image or video with improved contrast.

[0046] However, the light signals of different color channels emitted by the light source need to be modulated by the phase light modulation component and the amplitude light modulation component, and the driving modes of the phase light modulation component and the amplitude light modulation component are quite different, and the refresh rates, data loading times and action times of the micro-pixels of the two are quite different.

[0047] Therefore, in order to ensure that the projection display device can correctly display the image or video with improved contrast, it is necessary to ensure that the modulation timing of the phase light modulation component and the modulation timing of the amplitude light modulation component are synchronized and matched, for example, the phase light modulation component and the amplitude light modulation component modulate the light signals of the corresponding color channels in the modulation order of R-G-B, so that the light signals modulated by the phase light modulation component and the amplitude light modulation component can be finally displayed through the lens of the projection display device. Otherwise, if the timing of the phase light modulation component and the amplitude light modulation component is not matched, the finally displayed image or video will have display phenomena such as color misplacement, blur, ghosting, white field color deviation, gray scale discontinuity or inconsistent contrast.

[0048] Therefore, ensuring that the modulation timing of the phase light modulation component and the amplitude light modulation component is synchronized and matched is crucial for correctly displaying high-quality images or videos with improved contrast.

[0049] Therefore, the projection display device provided by the embodiments of the present application can more accurately control the synchronization and matching of the modulation order of the phase light modulation component and the amplitude light modulation component, so that the projection display device can correctly display the image or video with improved contrast, thereby effectively avoiding display problems such as color misplacement and blur, and improving the quality of projection display. Moreover, it is not necessary to additionally set other image processing chips on the projection display device to process the projection signal, so that the projection display device can display the image or video with improved contrast at low cost and quickly.

[0050] In order to make the purpose, technical solutions of the present application more clear and intuitive, the projection display device disclosed by the present application will be described in detail below with reference to the drawings.

[0051] It should be noted that the projection display device provided by the embodiments of the present application can have various implementation forms, for example, it can be a laser projection device, an LED projection display device, etc., and the present application does not limit this. In the following, the projection display device of the present application will be described in detail taking a laser projection display device as an example.

[0052] Please refer to FIG. 1, which is a structural schematic diagram of a projection display device disclosed by an embodiment of the present application. As shown in FIG. 1, the projection display device includes a light source 10, a light modulation assembly 20, a lens 30, and a housing 40 (only part of the housing 40 is shown in FIG. 1). The light modulation assembly 20 of the projection display device disclosed by an embodiment of the present application at least further includes a phase light modulation assembly (not shown in FIG. 1) and an amplitude light modulation assembly (not shown in FIG. 1).

[0053] The light source 10, the light modulation assembly 20, and the lens 30 can be respectively wrapped by corresponding housings, which can support the respective optical components and make the respective optical components meet certain sealing or airtightness requirements. Further, the respective housings of the light source 10, the light modulation assembly 20, and the lens 30 can be assembled in the housing 40.

[0054] In some embodiments, the light source 10, the light modulation assembly 20, and the lens 30 can be connected in sequence along the direction of light beam propagation. Specifically, one end of the light modulation assembly 20 is connected with the lens 30, and the light modulation assembly 20 and the lens 30 are arranged along the direction of projection light beam emission (for example, parallel to the N direction). The other end of the light modulation assembly 20 can be connected with the light source 10.

[0055] In some embodiments, the arrangement direction of the light source 10 and the light modulation assembly 20 is substantially perpendicular to the arrangement direction of the light modulation assembly 20 and the lens 30, that is, the direction of projection light beam emission (for example, parallel to the N direction) is substantially perpendicular to the direction of illumination light beam emission (for example, parallel to the M direction). This connection structure can on the one hand adapt to the light path characteristics of the amplitude light modulation assembly (to be described below) in the light modulation assembly 20, and on the other hand, is also conducive to shortening the length of the light path in one direction, so that more space can be provided for arranging the components of the laser projection device 1.

[0056] The functions and working principles of the above-mentioned components in the projection display device disclosed by an embodiment of the present application will be further introduced below. Please refer to FIG. 2, which is a projection imaging light path principle diagram of a projection display device disclosed by an embodiment of the present application.

[0057] As shown in FIG. 2, the projection display device includes a light source 10, a first light homogenizing component 210, an illumination mirror group, a light modulation assembly, and a lens 30. The illumination mirror group includes a reflecting mirror 220, a lens 230, and a prism assembly 260. The light modulation assembly includes a phase light modulation assembly 240 and an amplitude light modulation assembly 250. The first light homogenizing component 210, the reflecting mirror 220, the lens 230, the phase light modulation assembly 240, the amplitude light modulation assembly 250, and the prism assembly 260 are arranged in sequence along the direction of light beam propagation.

[0058] The light source 10 can provide an illumination light beam (e.g., a laser light beam). The light source 10 can include a laser, a fluorescent wheel, a color filter wheel, a reflection assembly, etc. (not shown in FIG. 2). The laser includes a monochromatic laser and a trichromatic laser, etc. The present application does not limit the laser.

[0059] In some embodiments, the light source 10 further includes a wavelength conversion device for receiving a blue laser excitation to generate other primary colors other than blue, which are collectively used to form the illumination light beam.

[0060] In the present embodiment, a trichromatic laser is taken as an example for description. The trichromatic laser can emit red laser, green laser and blue laser. The wavelength conversion device is no longer needed, and the trichromatic laser has a wide color gamut and high brightness, and can provide a high-quality illumination light beam. It should be noted that the trichromatic laser can emit parallel light, and the three light sources can emit light simultaneously or according to a preset modulation sequence (e.g., the sequence of RGB). The present application does not limit the laser.

[0061] The first light homogenizing component 210 can homogenize the illumination light beam emitted by the light source 10 and then emit the homogenized light beam to the mirror 220.

[0062] In some embodiments, the first light homogenizing component 210 is a light guide pipe. The light guide pipe receives the illumination light beam provided by the light source 10 and homogenizes the illumination light beam.

[0063] In some embodiments, the light guide pipe has a rectangular light outlet. The light guide pipe can shape the light spot of the light beam so that the shape of the light spot of the light beam matches the shape of the light modulation assembly.

[0064] In some embodiments, the first light homogenizing component 210 can also be a compound eye lens.

[0065] The mirror 220 can reflect the homogenized illumination light beam from the first light homogenizing component 210 to the lens 230.

[0066] The lens 230 can converge the illumination light beam reflected by the mirror 220 to the phase light modulation assembly 240.

[0067] The phase light modulation assembly 240 can modulate the phase of the illumination light beam and then reflect the modulated light beam to the amplitude light modulation assembly 250.

[0068] In some embodiments, the phase light modulation component 240 comprises a phase light modulator device (PLM) (not shown in FIG. 2). The phase light modulator device is a device that modulates the phase of the light beam in the phase light modulation component 240 and is composed of a plurality of light modulation units. Referring to FIG. 3, which is a structural schematic diagram of a phase light modulator device according to an embodiment of the present application, the phase light modulator device shown in FIG. 3 comprises a plurality of light modulation units 241.

[0069] In some embodiments, the light modulation unit 241 is a light modulation micromirror with a micron level, the reflecting surface of each light modulation micromirror is a plane, and the up and down movement is achieved in the direction perpendicular to the reflecting surface. The principle of the phase light modulator device modulating the phase of the light beam is that the height of the light modulation micromirror in the light modulation unit 241 is changed through the up and down displacement of the light modulation micromirror, so that the optical path of the incident light is changed, thereby changing the phase relationship between the light rays incident on each light modulation micromirror. Through the joint action of the plurality of light modulation micromirrors, the light intensity distribution of the incident light is adjusted. Since the laser emitted by the light source is coherent light, when the phase relationship between the light rays incident on each light modulation micromirror is changed, diffraction is formed, which realizes the redistribution of the light intensity. As shown in FIG. 3, the light in the dark area of the picture is transferred to the bright area, so that the bright area is brighter and the dark area is darker, thereby adjusting the light intensity distribution after the modulation by the phase light modulator device, and ultimately enhancing the contrast of the image or video.

[0070] In some embodiments, the phase light modulation component 240 can also modulate the phase of the incident illumination light beam and reflect it to the prism component 260, and the prism component 260 reflects the illumination light beam incident thereon to the amplitude light modulation component 250.

[0071] The amplitude light modulation component 250 modulates the light signal modulated by the phase light modulation component 240 to obtain a projection light beam and shoots the projection light beam to the lens 30.

[0072] In some embodiments, the amplitude light modulation component 250 can be a reflective light valve. The amplitude light modulation component 250 comprises a plurality of reflecting pieces, each of which corresponds to a pixel in the projection picture. For example, according to the projection picture to be displayed, the reflecting piece corresponding to the pixel that needs to be displayed in the bright state in the plurality of reflecting pieces of the amplitude light modulation component 250 can reflect the light beam to the lens 30, and the light beam reflected to the lens 30 is called a projection light beam. In this way, the amplitude light modulation component 250 can modulate the illumination light beam to obtain a projection light beam, and realize the display of the picture through the projection light beam.

[0073] In some embodiments, the amplitude light modulation component 250 can be a Digital Micromirror Device (DMD). The Digital Micromirror Device includes a plurality of (e.g., thousands of) tiny mirrors that can be individually driven to rotate. The plurality of tiny mirrors can be arranged in an array. One tiny mirror (e.g., each tiny mirror) corresponds to one pixel in the projected image to be displayed, and the light reflection of each pixel can be precisely controlled by the mirror to form a high-definition image.

[0074] For example, the Digital Micromirror Device can quickly change the tilt angle of each mirror (e.g., flip between a positive angle and a negative angle) according to the pixel information of the image signal or the video signal, thereby modulating the light beam modulated by the phase light modulation device. This modulation method enables the Digital Micromirror Device to precisely control the brightness and color of each pixel, thereby generating a high-quality image or video. Through cooperation with the phase light modulation device, the Digital Micromirror Device can further optimize the light intensity distribution of the light signal of each color channel, ensuring that the finally displayed image or video has high contrast.

[0075] The lens 30 focuses and magnifies the projected light beam modulated by the amplitude light modulation component 250, and projects the image or video to be displayed in the form of a light beam to a target object. The target object can be a projection screen or a wall, etc., to form a projection image, so that the projection display device completes the display of the image or video. Please refer to FIG. 4, which is an application scenario diagram of a projection display device disclosed in an embodiment of the present application. As shown in FIG. 4, the projection device can project the projection light beam on the projection screen through the lens, so that the projection screen displays the image or video corresponding to the projection signal, thereby facilitating the user to watch the image or video corresponding to the projection signal.

[0076] From the above description, the working principle of each component of the projection display device has been understood. Then, in order to project the image or video corresponding to the projection signal, the above-mentioned components need to work according to the set control logic, so as to complete the entire projection process. Therefore, in order to further understand the control process between the components of the projection display device, please refer to FIG. 5, which is a circuit control schematic diagram of a projection display device disclosed in an embodiment of the present application.

[0077] As shown in FIG. 5, the control circuit of the projection display device includes a multimedia signal board 510, a light source circuit 520, a display driving circuit 530, a light source driving circuit 540, a laser light source 550, a phase light modulation component 560, an amplitude light modulation component 570, and a lens 580. The laser light source 550 includes a laser 551.

[0078] After receiving the projection signal, the multimedia signal board 510 can further process the projection signal (for example, geometric correction processing), and can also generate a dimming signal based on the processed projection signal. It should be noted that the projection signal can be an image signal or a video signal, which is not limited in the present application.

[0079] In some embodiments, the multimedia signal board 510 can be a System On Chip (SOC), which can be used to decode an external video source into a video signal and an external image source into an image signal, and send the image signal or the video signal to the display driving circuit 530 as the projection signal.

[0080] It should be noted that the external video source and the external image source can be network videos and images, HDMI video signals and image signals, or videos and images in a storage medium such as a U disk, and the decoded video signal and image signal can be Vertex Buffer Objects (VBO), Low Voltage Differential Signaling (LVDS) signals, etc. for transmission inside the whole machine of the projection display device.

[0081] After the display driving circuit 530 obtains the projection signal from the multimedia signal board 510, it drives the light source driving circuit 540, the phase light modulation component 560 and the amplitude light modulation component 570 according to the projection signal.

[0082] In some embodiments, the display driving circuit 530 is connected to the light source driving circuit 540, so that the display driving circuit 530 can send a dimming signal to the light source driving circuit 540 to drive the laser 551 in the laser light source 550 to emit a laser beam.

[0083] The dimming signal can include an Analog dimming (Adim) signal and a Pulse width modulation (Pwm) signal.

[0084] The Pwm signal is used to control the presence or absence of a driving current transmitted to the laser light source 550, and the Adim signal in the dimming signal is used to control the size of the current value of the driving current.

[0085] The light source driving circuit 540 can also be referred to as a laser driving circuit, which is a DC-DC conversion circuit, which can be a boost circuit or a buck circuit.

[0086] The light source driving circuit 540 receives the dimming signal sent by the display driving circuit 530, receives the power input voltage of the light source circuit 520, and converts the input power input voltage into a power output voltage based on the dimming signal, and outputs a driving current to the laser light source 550.

[0087] The laser light source 550 emits light under the driving of the driving current, and transmits the light to the phase light modulation component 560.

[0088] In some embodiments, the laser light source 550 is configured to emit a light signal.

[0089] Optionally, the laser light source 550 can include at least one laser 551 configured to emit a light signal of a plurality of color channels. For example, a light signal of a red color channel, a light signal of a green color channel, a light signal of a blue color channel, and the like.

[0090] Optionally, each laser 551 can include a plurality of laser light emitting chips.

[0091] The number of light source driving circuits 540 is the same as the number of lasers 551, and each light source driving circuit 540 corresponds to one laser 551.

[0092] In the embodiments of the present application, the laser light source 550 is a three-color laser including a red laser, a blue laser, and a green laser. Then, the projection device includes a red light driving circuit, a green light driving circuit, and a blue light driving circuit. Each of the three lasers 551 is connected to a corresponding light source driving circuit.

[0093] In some embodiments, the display driving circuit 530 sends an enable signal of a target color channel to the phase light modulation component 560, and the enable signal is used to instruct the phase light modulation component 560 to modulate the phase of the light signal of the target color channel.

[0094] In some embodiments, the display driving circuit 530 sends an enable signal of a target color channel to the amplitude light modulation component 570, and the enable signal is used to instruct the amplitude light modulation component 570 to modulate the light signal of the target color channel after being modulated by the phase light modulation component 560.

[0095] The target color channel can be a light signal of any color channel, such as a light signal of a red color channel.

[0096] It should be noted that the enable signal is a control signal for controlling the start or stop of the phase modulation function of the phase light modulation assembly 560, and for controlling the start or stop of the modulation function of the amplitude light modulation assembly 570, i.e., controlling the amplitude light modulation assembly 570 to modulate the light signal modulated by the phase light modulation assembly 560. The enable signal is usually a logic signal, which can be a level change (such as from low to high or vice versa), and the present application does not limit this.

[0097] It should be noted that the first enable signal and the second enable signal are control signals for the display driving circuit 530 to drive the phase light modulation assembly 560 and the amplitude light modulation assembly 570 to modulate the light signal of the same color channel, so that the phase light modulation assembly 560 and the amplitude light modulation assembly 570 modulate the light signal of the same color channel.

[0098] For example, in FIG. 5, the display driving circuit 530 can send the first enable signal to the phase light modulation assembly 560, and the display driving circuit 530 can also send the second enable signal to the amplitude light modulation assembly 570. The specific indications of the first enable signal and the second enable signal will be described in detail below, and will not be repeated here.

[0099] The lens 580 can project the light signal modulated by the amplitude light modulation assembly 570, and display an image or video corresponding to the projected signal.

[0100] From the above introduction, the working principle of each component of the projection display device and the control logic of the projection display can be understood. The present inventors have found that for a laser projection display device, a phase light modulation system (PLM) can be added, which can include an image algorithm unit, a phase light modulation driving control unit, and a phase light modulation display unit, etc. By phase modulating the laser area light source, more light is allowed to reach the bright area and less light is allowed to reach the dark area by using the diffraction of light, thereby realizing local dimming and ultimately achieving the purpose of improving the dynamic contrast ratio of the laser display product image.

[0101] However, the inventors of the present application have found that image display may be stuck after adding the PLM phase dimming system. In order to solve the technical problem, the inventors of the present application have further found that, in order to synchronize the output of the signal representing image content and the signal representing the brightness of each subzone of the phase diagram, the video signal processing time is increased, and the delay time of the video signal is increased. Therefore, different display strategies can be adopted for different scenes. Specifically, the PLM phase dimming technology can be introduced only when it is determined that the current scene is a high-contrast scene, so as to avoid increasing the delay time in other scenes. Based on this, the embodiments of the present application provide a projection display device and method.

[0102] The following describes how the projection display device adopts different projection display strategies for different scenes, taking the controller of the projection display device as an example.

[0103] The technical solutions of the present application will be described in detail below in combination with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in detail in some embodiments.

[0104] Referring to FIG. 6, FIG. 6 is a flowchart of a projection display method provided by the present application. As shown in FIG. 6, the method comprises the following steps:

[0105] 401. Receive an image signal of a signal source.

[0106] Specifically, the projection display device can receive image signals from multiple signal sources. The image signals can include videos or images.

[0107] In some embodiments, as shown in FIG. 7a, the projection display device can include an image signal system 50, which can include a multimedia processing unit 501. The multimedia processing unit 501 receives video signals of multiple signal sources.

[0108] For example, as shown in FIG. 7b, the multimedia processing unit 501 can include a signal source switching switch 5011, a signal detection subunit 5012, a signal resolution scaling subunit 5013, a signal format conversion subunit 5014, and a single / multi-channel video processing subunit 5015.

[0109] The signal source switching switch 5011 is used to detect HDMI signal sources, analog / digital television channel signal sources, USB channel signal sources, network video application signal sources, etc., and switch to the corresponding input signal source channel.

[0110] The single / multi-channel video processing subunit 5015 is configured to select single-channel video processing or multi-channel video processing according to different APP applications when switching to a network video application signal source. For example, APP applications such as "fitness", "video call", "search", etc. can perform multi-channel video processing.

[0111] The signal detection subunit 5012 is configured to perform timing detection, color gamut conversion, and HDR processing on the signal input into the subunit. Specifically, the input signal is detected for timing, resolution, and frame rate, and the input signal is processed for brightness and contrast. Color gamut conversion is performed between different color spaces.

[0112] The signal resolution scaling subunit 5013 is configured to perform resolution scaling on the signal input into the subunit. For example, assuming that the resolution of the signal input into the subunit is 1920x1080 and the resolution of the output to the display screen is 3840x2160, the resolution of the signal can be scaled by the subunit to 4 pixels from 1 pixel.

[0113] The signal format conversion subunit 5014 is configured to perform format conversion on the signal input into the subunit and output a timing signal required by the back-end display after processing.

[0114] 402. Determine a current scene, and if the current scene is a first scene, generate a first signal and a second signal that are mutually synchronized according to the image signal; the first signal is used to represent image content of the image signal, and the second signal is used to represent brightness of at least one partition in an image frame of the image signal.

[0115] Specifically, in order to meet different needs of users, multiple scenes can be divided, such as a first scene and a second scene. In the embodiments of the present application, different scenes are classified into the first scene and the second scene, wherein the first scene refers to a high-contrast scene, for example, when watching a movie; and the second scene refers to a low-latency scene, for example, when playing a game. In the first scene, the user's demand for contrast is relatively high compared to the demand for latency, and therefore, PLM phase light modulation can be introduced to achieve high contrast.

[0116] As shown in FIG. 7a, the image signal system 50 further includes an image processing unit 502. After the image signal of the signal source is received by the multimedia unit 501, the image processing unit 502 can determine which scene the current scene is, and if it is the first scene which requires high contrast, the PLM phase light modulation system can be introduced. Specifically, the image processing unit 502 can include multiple channels, different channels corresponding to different scenes, and different processing of the image signal under different scenes. For example, when the current scene is the first scene, the image signal can be processed by the phase modulation channel in the image processing unit 502, and when the current scene is the second scene, the image signal can be processed by the low delay channel in the image processing unit 502.

[0117] In some embodiments, the phase modulation channel can include a phase map processing subunit connected with the multimedia processing unit, configured to divide the to-be-displayed image frame of the image signal into multiple partitions, determine the brightness of the multiple partitions according to the statistical characteristics of the corresponding images of the multiple partitions, and obtain the phase map corresponding to the to-be-displayed image frame of the image signal.

[0118] In some embodiments, the phase modulation channel can further include a resolution scaling subunit connected with the phase map processing subunit, configured to perform resolution adjustment on the phase map corresponding to the to-be-displayed image frame of the image signal, obtain a first signal and a second signal, and output the first signal and the second signal synchronously based on a target clock signal.

[0119] As shown in FIG. 7c, the image processing unit 502 can include a phase modulation channel, which includes a VB1 signal input subunit 5021, a phase map processing subunit 5022, a resolution scaling subunit 5023, a VB1 signal output subunit 5024 and a DP signal output subunit 5025.

[0120] The VB1 signal input subunit 5021 is configured to receive the image signal in the VB1 (V by one) format input by the multimedia processing unit 501.

[0121] The phase diagram processing subunit 5022 is configured to perform operation, analysis and processing on the input image signal in the VB1 format, the image signal including a plurality of to-be-displayed image frames, and for each to-be-displayed image frame in the plurality of to-be-displayed image frames, the to-be-displayed image frame can be divided into a plurality of partitions (wherein the number of partitions is related to the processing capability of the phase light modulation component in the subsequent imaging display unit, for example, the number of partitions is less than or equal to the size of the resolution of the phase light modulation component) by the algorithm component of the phase processing subunit 5022, and the image brightness of each partition is analyzed and calculated according to the statistical characteristics of the images of the plurality of partitions, so as to dynamically adjust the original input gray scale of the image according to the contrast enhancement algorithm, so that the brightness of the high-light part of the image can reach the maximum, and the brightness of the dark part can be reduced or even turned off. In some embodiments, the PLM light adjustment algorithm is processed in an integral frame, and the R, G and B three primary color pixel channels are processed respectively.

[0122] The resolution scaling subunit 5023 is configured to scale the resolution of the image signal output by the phase diagram processing subunit 5022, and finally output a 1-way VB1 image signal to the display drive control unit and a 1-way DP (Display port) image signal to the display image phase execution unit. The 2-way image signals are required to be output synchronously, and for example, the output of the two-way image signals can be based on the same target clock source to achieve the effect of synchronous output.

[0123] In some embodiments, there are various ways to determine the current scene.

[0124] In one implementation manner, a UI interface can be provided for the user to receive a selection operation of the user, and the current scene is determined according to the selection operation. Specifically, the projection display device can further include:

[0125] A projection screen configured to display the image content projected by the lens; the image content includes a scene selection interface; and the scene selection interface includes a selection control.

[0126] The image processing unit is further configured to determine the current scene in response to a touch operation on the selection control.

[0127] In another implementation manner, considering that the user will frequently refresh the screen when feeling that the image is stuck, the refresh action of the user can be identified, and then the current scene is determined based on the identification result. Specifically, the image processing unit is further configured to identify a refresh action of the user on the display interface of the projection screen, and determine the current scene according to the identification result.

[0128] Specifically, the refresh action can be identified in terms of execution frequency. If the frequency is greater than a preset frequency, it can be indicated that the user considers that the current display is stuttering. If the current is the first scene, the scene needs to be exited and switched to another scene, for example, the second scene.

[0129] In yet another implementable manner, different scenes can be distinguished according to a refresh rate of the image signal. Specifically, the image processing unit is further configured to acquire the refresh rate of the image signal, and determine the current scene according to the refresh rate.

[0130] Specifically, the refresh rate of the image signal can be read from the screen parameter of the input image signal by a decoding tool. If the refresh rate is greater than a preset value, it indicates that the image signal is a video signal of a game, which requires a lower delay, and thus it can be determined that the current scene is the second scene. If the refresh rate is less than the preset value, it indicates that the image signal is a video signal for viewing, which has a higher demand for contrast and does not require a low delay, and thus it can be determined that the current scene is the first scene.

[0131] It should be noted that the high contrast in the first scene is relative to the contrast without using PLM phase light modulation. After using PLM, the contrast is improved. The low delay in the second scene is relative to the delay with using PLM phase light modulation. Without using PLM, the time consumed for synchronization can be saved, and thus the delay is reduced after not using PLM.

[0132] 403、processing the first signal to obtain a first amplitude modulation driving signal.

[0133] Specifically, the first amplitude modulation driving signal is used to adjust the intensity of the laser beam. For example, a Digital Micromirror Device (DMD) can be controlled to realize amplitude modulation. The DMD chip is composed of a large number of small mirrors. Each mirror represents a pixel point. The first amplitude modulation driving signal controls each mirror to flip at a corresponding angle, thereby controlling the intensity and color of the light, realizing amplitude modulation, and forming an image on the screen.

[0134] In some embodiments, as shown in FIG. 7a, the image signal system 50 can further include a display driving control unit 503 connected with the image processing unit 502, configured to process the first signal to obtain a first amplitude modulation driving signal.

[0135] As shown in FIG. 7d, the display driving control unit 503 includes a memory and a program storage control subunit 5030, which is a control center for program storage, data calculation and output instruction of a Digital Light Processing (DLP) display unit.

[0136] The display driving control unit 503 includes an input signal interface 5031 for receiving a VB1 video signal and UI data output by the image processing unit 502.

[0137] The display driving control unit 503 includes a signal format conversion subunit 5032 for timing detection of the signal output by the input signal interface 5031, and detection of the resolution and frame rate of the signal.

[0138] The display driving control unit 503 includes a video processing subunit 5033 for processing the brightness, contrast, color and definition of the signal output by the signal format conversion subunit 5032.

[0139] The display driving control unit 503 includes a frame rate format conversion subunit 5034 for processing the resolution and frame rate of the signal output by the video processing subunit 5033, and outputting the corresponding frame rate and resolution. The frame rate format conversion subunit 5034 is also used for cache processing and pixel color refresh setting of the video signal input by the multimedia unit 501.

[0140] The display driving control unit 503 includes a geometric correction subunit 5035 for image correction of the signal output by the frame rate format conversion subunit 5034 according to the input correction parameter, and final correction into a rectangle.

[0141] The display driving control unit 503 includes a galvanometer driving signal generator 5036, an operational amplifier 50361 and a galvanometer 50362, which are used for pixel expansion, pixel array reconstruction and other image processing methods of the signal output by the geometric correction subunit 5035, to improve the display resolution.

[0142] The display driving control unit 503 includes a picture quality processing subunit 5037 for primary color correction, color mixing correction, white balance processing and the like of the signal output by the galvanometer driving signal generator 5036.

[0143] The display driving control unit 503 includes a DLP format conversion subunit 5038 for receiving the signal output by the picture quality processing subunit 5037, encoding the video format of the signal, and converting the signal into a format suitable for DMD display.

[0144] The display driving control unit 503 comprises a DMD data interface module and a control interface 5039. The DMD data interface module is used for data transmission of the input signal in the format conforming to the DMD display according to the HSSI high-speed signal transmission protocol. The DMD control interface is used for outputting instructions to control the DMD to realize specific functions.

[0145] 404. processing the second signal to obtain a phase modulation driving signal.

[0146] Specifically, the phase modulation driving signal comprises the brightness of each sub-area, and the phase light modulation assembly can adjust the original input gray scale of the image according to the phase modulation driving signal, so that the brightness of the high-light part of the image can reach the maximum, and the brightness of the dark part can be reduced or even turned off.

[0147] In some embodiments, as shown in FIG. 7a, the image signal system 50 can comprise a display image phase execution unit 504 connected with the image processing unit 502, for processing the second signal to obtain a phase modulation driving signal.

[0148] For example, as shown in FIG. 7e, the display image phase execution unit 504 comprises a PLM bias voltage adapter unit 5041 for providing bias voltage for the phase modulation device in the imaging display unit and the phase light modulation driving system 5402.

[0149] The display image phase execution unit 504 comprises a phase light modulation driving system 5042 for driving the second signal to obtain a phase modulation driving signal.

[0150] 405. imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal.

[0151] Specifically, after obtaining the first amplitude modulation driving signal and the phase modulation driving signal, the laser beam can be phase-modulated based on the phase modulation driving signal to improve the dynamic contrast, and the intensity of the laser beam can be modulated based on the amplitude modulation driving signal to display the image content.

[0152] In some embodiments, as shown in FIG. 7a, the image signal system 50 can comprise an imaging display unit 505 connected with the display driving control unit 503 and the display image phase execution unit 504, for imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal.

[0153] Specifically, the imaging display unit 505 receives the first amplitude modulation driving signal (time sequence display video signal (VB1 signal)) output by the display driving control unit 503, and simultaneously receives the phase modulation driving signal output by the display image phase execution unit 504, to realize local control of the backlight according to the light source lighting time sequence, output each primary color phase-modulated backlight (backlight partition signal, the resolution of the backlight partition signal is less than the resolution of the VB1 signal), and finally realize simultaneous display of image content and backlight partition.

[0154] In some embodiments, the display driving control unit is further configured to generate a primary color synchronization signal; the primary color synchronization signal is used to represent the lighting time sequence of the plurality of primary color lasers.

[0155] In some embodiments, as shown in FIG. 7f, the imaging display unit 505 includes a light source 5052 configured to emit light signals of each color channel in sequence according to the primary color synchronization signal, that is, emit laser beams according to the primary color synchronization signal.

[0156] Specifically, the light source can be a three-color light source, and can output three-color lasers that are sequentially lit.

[0157] In some embodiments, the imaging display unit 505 includes a phase light modulation component 5053 configured to be set to a phase adjustment state in a first scene, and modulate the laser beams according to the phase modulation driving signal to generate phase-modulated laser beams.

[0158] Specifically, the phase light modulation component 5053 outputs each primary color phase-modulated backlight according to the light source lighting time sequence.

[0159] In some embodiments, the imaging display unit 505 includes an amplitude light modulation component 5054 configured to modulate the phase-modulated laser beams according to the first amplitude modulation driving signal to obtain first image beams, and output the first image beams to a lens.

[0160] Specifically, the amplitude light modulation component 5054 can be a DMD chip, which is used for time sequence display video signals and realizes local control of the backlight in combination with phase light modulation.

[0161] In some embodiments, the imaging display unit 505 includes a lens 5055 configured to project the first image beams to form an image.

[0162] In some embodiments, the imaging display unit 505 includes a laser driving subunit 5051 configured to output red, green, and blue primary color luminance pulse width modulation (PWM) signals and duty signals according to a primary color synchronization signal to sequentially light the light source. The PWM represents the luminance value of each primary color signal, and the duty signal represents the weight ratio of each primary color signal in a complete color period signal.

[0163] In some embodiments, the refresh mode of the image pixel color is to decompose a frame of image into RGB components, which is referred to as 1RGB frame. In the refresh process, each component is sequentially refreshed according to a control image pixel enable signal (R_EN, G_EN, B_EN) to enable each component. As shown in FIG. 8, the R component can be enabled first, the G component can be enabled after the refresh of the R component is completed, and the B component can be enabled after the refresh of the G component is completed. After the refresh of the B component is completed, the refresh of the frame of image is completed.

[0164] As can be seen from the above description, the projection display method provided by the embodiments of the present application generates two signals that are synchronized with each other by using a phase modulation channel after determining that the current scene is the first scene, one signal is used for amplitude modulation, and the other signal is used for phase modulation, thereby introducing phase modulation and improving the dynamic contrast of the projection display device.

[0165] In order to ensure that the projection display device can correctly display the image or video with improved contrast, it is necessary to ensure that the modulation timing of the phase light modulation component 560 and the amplitude light modulation component 570 is synchronized, that is, when the phase light modulation component 560 modulates the light signal of the red channel, the amplitude light modulation component 570 also modulates the light signal of the red channel that has been modulated by the phase light modulation component 560. Only when the phase light modulation component 560 and the amplitude light modulation component 570 modulate the light signal according to the same modulation order, can it be ensured that the light signal modulated by the phase light modulation component 560 and the amplitude light modulation component 570 can be finally successfully displayed through the lens of the projection display device to display the image or video with improved contrast.

[0166] The embodiments of the present application provide a projection display control method, which realizes the synchronization and matching of the modulation timing of the phase light modulation component 560 and the amplitude light modulation component 570, and reduces the design and assembly cost of the projection display device. Please refer to FIG. 9, which is a flowchart of a projection display control method disclosed by the embodiments of the present application. The control method can include the following steps:

[0167] Step 701, when the timing signal of the first color channel is a pulse falling edge, the display driving circuit sends the first enable signal of the second color channel to the phase light modulation component, and sends the second enable signal of the second color channel to the amplitude light modulation component, the second color channel being the next color channel of the first color channel in the modulation sequence.

[0168] In the projection display process, the sequence of light beams of different colors emitted by the light source needs to be in a specific modulation sequence. Therefore, the light source can emit light signals of each color channel in turn according to the modulation sequence.

[0169] In some embodiments, the modulation sequence can be RGB (modulating the light signal of the red channel first, then the light signal of the green channel, and finally the light signal of the blue channel), RBG (modulating the light signal of the red channel first, then the light signal of the blue channel, and finally the light signal of the green channel), BGR (modulating the light signal of the blue channel first, then the light signal of the green channel, and finally the light signal of the red channel), etc., which are not limited in the present application. However, for the convenience of understanding the projection display control method disclosed in the embodiments of the present application in the following, RGB is taken as an example for description in the following.

[0170] It should be noted that the modulation sequence is pre-configured in the projection display device, so the color sequence of the light beams emitted by the light source of each projection display device is always the same during projection display.

[0171] In some embodiments, the display driving circuit sends a light source driving signal to the light source driving circuit, the light source driving signal including the modulation sequence; after receiving the light source driving signal, the light source driving circuit drives the light source to emit light signals of each color channel to the phase light modulation device according to the modulation sequence. For example, the light source emits red laser, green laser and blue laser in turn according to the sequence of RGB.

[0172] Optionally, the display driving circuit can also send a light source driving signal to the light source driving circuit in the case that the projection signal is not detected within the preset time, the light source driving signal including a stop emitting instruction of the light signal, so that the light source driving circuit drives the light source to stop emitting the light signal to the phase light modulation component, to end the projection.

[0173] In this embodiment, the display driving circuit drives the light source to emit the light signal through the light source driving circuit, which can ensure that the display driving circuit quickly drives the light source to start after obtaining the projection signal, avoids the delay of the light source, ensures the close cooperation between the light source and the subsequent modulation process, reduces the operation time difference between different components of the projection display device, and improves the real-time performance and dynamic response capability of the projection display device when displaying images or videos.

[0174] In the embodiments of the present application, in order to synchronize the modulation sequence of the phase light modulation assembly and the amplitude light modulation assembly, a time sequence signal of the light signal of each color channel emitted by the light source is detected by the display driving circuit.

[0175] In some embodiments, the time sequence signal of each color channel is a periodically changing pulse signal. In the pulse signal, the signal usually jumps from low level (0) to high level (1) and then returns to low level. The width of each pulse signal in the time sequence signal is used to represent the emission time length of the light signal of each color channel, and the frequency of the high and low level change of the pulse signal in the time sequence signal is used to represent the modulation frequency of each color channel.

[0176] For example, the time sequence signal of each color channel obtained by the display driving circuit from the projection signal can be seen from FIG. 10, which is a schematic diagram of the time sequence signal of each color channel disclosed in the embodiments of the present application. FIG. 10 includes the time sequence signal of the R red color channel, the time sequence signal of the G green color channel, and the time sequence signal of the B blue color channel. In the time sequence signal of the three color channels, the pulse signal is periodically changed.

[0177] As shown in FIG. 10, S1 represents one period of the time sequence signal of the R red color channel, the time sequence signal of the G green color channel, and the time sequence signal of the B blue color channel. In the period S1, the order of the starting positions of the pulses in the time sequence signals of the three color channels is R, G, and B. It should be noted that FIG. 10 is only an example of the present application, and the modulation sequence of each color channel corresponding to different projection signals is different. The present application only takes the R, G, and B sequence as an example for description, and this is not limited.

[0178] In some embodiments, the display driving circuit detects the time sequence signal of the light signal of each color channel emitted by the light source, including: the display driving circuit detects the pulse change of the time sequence signal of each color channel. In the pulse change of each time sequence signal, the level state (high or low) of the time sequence signal of each color channel changes. In this embodiment, according to the pulse change of each time sequence signal, the modulation time of each color channel can be determined, and it can be determined when the phase light modulation assembly needs to modulate the light signal of which color channel.

[0179] In some embodiments, the display driving circuit detects the pulse change of the time sequence signal of each color channel, including: the display driving circuit detects that the time sequence signal of the first color channel is a pulse falling edge. The first color channel is any color channel.

[0180] It should be noted that, since a certain operation time is required for the display driving circuit to detect the pulse change of each timing signal and drive the phase light modulation component and the amplitude light modulation component, unnecessary delay will be caused. Therefore, the falling edge of the pulse of each timing signal can be detected by the display driving circuit.

[0181] In this embodiment, since the timing signal of each color channel is a periodic pulse signal, the display driving circuit can accurately detect the falling edge of the pulse of the timing signal, so that the modulation sequence synchronization of the phase light modulation component and the amplitude light modulation component can be more accurately controlled.

[0182] In the embodiment of the present application, when the display driving circuit detects that the timing signal of the first color channel is the falling edge of the pulse, the display driving circuit sends the first enable signal of the second color channel to the phase light modulation component, and sends the second enable signal of the second color channel to the amplitude light modulation component, the second color channel being the next color channel of the first color channel in the modulation sequence.

[0183] For example, as shown in the circuit control schematic diagram of a projection display device in FIG. 5, when the display driving circuit 530 detects the light signal emitted by the laser light source 550 driven by the light source driving circuit 540, the display driving circuit 530 detects the falling edge of the pulse of the timing signal of each color channel in real time. When the display driving circuit 530 detects that the timing signal of the first color channel is the falling edge of the pulse, the display driving circuit 530 sends the first enable signal to the phase light modulation component 560, and sends the second enable signal to the amplitude light modulation component 570.

[0184] It should be noted that, the first color channel can be any color laser emitted by the laser light source 550. For example, when the laser 551 of the laser light source 550 is a three-color laser, the first color channel can be red laser, or green laser, or blue laser. When the first color channel is red laser, and the modulation sequence is RGB, the second color channel is green laser; when the first color channel is green laser, and the modulation sequence is RGB, the second color channel is blue laser; when the first color channel is blue laser, and the modulation sequence is RGB, the second color channel is red laser.

[0185] The first enable signal is used to drive the phase light modulation component to modulate the phase of the light signal of the second color channel. The second enable signal is used to drive the amplitude light modulation component to modulate the light signal of the second color channel after the modulation of the phase light modulation component.

[0186] It should be noted that when the timing signal of the first color channel is detected as a pulse falling edge, it indicates that the phase light modulation component is about to complete the modulation of the light signal of the first color channel, and according to the modulation sequence, the phase light modulation component needs to be driven to start to modulate the phase of the light signal of the next color channel of the first color channel, that is, to start the phase modulation of the light signal of the second color channel. In this embodiment, the phase light modulation component and the amplitude light modulation component can be triggered to modulate the next color channel by detecting the pulse falling edge of the timing signal of the previous color channel, so that the modulation sequence of the phase light modulation component and the amplitude light modulation component is synchronized.

[0187] For example, please refer to FIG. 11, which is a schematic diagram of the modulation sequence of the phase light modulation component and the RGB timing signal disclosed in the embodiment of the present application.

[0188] Taking the R, G, B modulation sequence as an example, when the display driving circuit detects the timing signal of B as a pulse falling edge at S1 moment, the display driving circuit judges that this is the start of a new period, and determines that the light signal of R channel will be modulated according to the R, G, B modulation sequence; further, the display driving circuit sends the enable signal of modulating the light signal of R channel to the phase light modulation component, and sends the enable signal of the light signal of R channel to the amplitude light modulation component, so as to control the phase light modulation component and the amplitude light modulation component to modulate the light signal of R channel in turn.

[0189] When the display driving circuit detects the timing signal of R as a pulse falling edge at S2 moment, the display driving circuit determines that the light signal of G channel will be modulated according to the R, G, B modulation sequence; further, the display driving circuit sends the enable signal of modulating G channel to the phase light modulation component, and sends the enable signal of the light signal of G channel to the amplitude light modulation component, so as to control the phase light modulation component and the amplitude light modulation component to modulate the light signal of G channel in turn.

[0190] When the display driving circuit detects the timing signal of G as a pulse falling edge at S3 moment, the display driving circuit determines that the light signal of B channel will be modulated according to the R, G, B modulation sequence; further, the display driving circuit sends the enable signal of modulating B channel to the phase light modulation component, and sends the enable signal of the light signal of B channel to the amplitude light modulation component, so as to control the phase light modulation component and the amplitude light modulation component to modulate the light signal of B channel in turn.

[0191] When the display driving circuit detects that the timing signal of B is a pulse falling edge at S4, the display driving circuit determines that the light signal of the R channel is to be modulated according to the R, G, B modulation sequence; further, the display driving circuit sends an enable signal of the R channel to the phase light modulation component and an enable signal of the light signal of the R channel to the amplitude light modulation component, so as to control the phase light modulation component and the amplitude light modulation component to modulate the light signal of the R channel in turn.

[0192] Therefore, the phase light modulation component and the amplitude light modulation component are driven to modulate the light signal of the next color channel by the display driving circuit detecting the pulse falling edge of the timing signal of the last color channel in a loop, so that the modulation sequence of the phase light modulation component and the amplitude light modulation component is synchronized, and the image or video with improved contrast can be displayed correctly.

[0193] In some embodiments, when the projection signal is a video signal, the display driving circuit detects that the timing signal of the third color channel of the first frame signal of the video signal is a pulse rising edge, and the display driving circuit sends a third enable signal corresponding to the third color channel to the phase light modulation component and a third enable signal of the third color channel to the amplitude light modulation component, and the third color channel is the first color channel in the modulation sequence.

[0194] The third enable signal is used to drive the phase light modulation component to modulate the phase of the light signal of the third color channel after receiving the third enable signal, and is used to drive the amplitude light modulation component to modulate the light signal of the third color channel after receiving the third enable signal.

[0195] For example, taking the R, G, B modulation sequence as an example. When the first frame image of the video signal is detected, and the first pulse rising edge of the timing signal of the R channel of the first frame image is detected, the display driving circuit determines that the video signal projection display needs to be started, and the display driving circuit sends an enable signal corresponding to the R color channel to the phase light modulation component and an enable signal of the R color channel to the amplitude light modulation component, so as to control the phase light modulation component and the amplitude light modulation component to modulate the light signal corresponding to the R channel.

[0196] It should be noted that when the projection signal is a video signal, since the video signal is invalid before starting, when the first pulse rising edge of the first frame signal is detected, it indicates that the modulation of the light signal of each color channel of the video signal is about to start, and at this time, the modulation of the light signal of the color channel where the first pulse rising edge is located can be started according to the modulation sequence.

[0197] It should be noted that the first pulse rising edge of the first frame signal of the video signal is detected only when the first frame signal of the video signal is detected. Since the video signal is composed of a plurality of continuous images, after the phase light modulation assembly starts to modulate the light signal of the color channel where the first pulse rising edge of the first frame signal is located, the modulation for each subsequent color channel is also performed by detecting the pulse falling edge of the timing signal corresponding to each color channel in real time.

[0198] In this embodiment, the display driving circuit can ensure that the modulation timing of the phase light modulation assembly and the amplitude light modulation assembly is synchronized and matched when the video signal starts from the first frame, thereby further improving the display effect of the video with improved display contrast of the projection display device.

[0199] In some embodiments, the display driving circuit further includes a microcontroller unit (MCU), and when the timing signal of the first color channel is a pulse falling edge, the display driving circuit sends a first enable signal of a second color channel to the phase light modulation assembly and a second enable signal of the second color channel to the amplitude light modulation assembly, including: when the timing signal of the first color channel is a pulse falling edge, the display driving circuit sends the first enable signal of the second color channel to the phase light modulation assembly through the MCU and sends the second enable signal of the second color channel to the amplitude light modulation assembly through the MCU.

[0200] In this embodiment, when the pulse falling edge of the timing signal of the previous color channel is detected, the phase light modulation assembly and the amplitude light modulation assembly are driven by the MCU to modulate the light signal of the next color channel, which is lower in cost than other image processing chips, and the MCU is integrated in the display driving circuit, which simplifies the design of the projection display device and reduces the need for other complex control hardware.

[0201] It should be noted that those skilled in the art can also configure other processing units in the display driving circuit to perform the above steps performed by the MCU, without the need to additionally set other components for the projection display device.

[0202] Step 702, after receiving the first enable signal, the phase light modulation assembly modulates the phase of the light signal of the second color channel.

[0203] In some embodiments, the phase light modulation component modulates the phase of the light signal of the second color channel upon receiving the first enable signal, including: the phase light modulation component, in response to the first enable signal, triggering a modulation signal corresponding to the second color channel in the phase light modulation component; and modulating the phase of the light signal corresponding to the second color channel according to the modulation signal corresponding to the second color channel.

[0204] In some embodiments, the modulation signal is a modulation signal (e.g., a trigger signal) in the phase light modulation component. Each color channel corresponds to a respective modulation signal. It should be understood that the modulation signal corresponding to each color channel is used to control the phase light modulation component to modulate the light signal of the corresponding color. For example, when the phase light modulation component receives an enable signal corresponding to the light signal of the red color channel, the modulation signal corresponding to the light signal of the red color channel in the phase light modulation component is triggered, and the phase light modulation component controls the phase light modulation device in the phase light modulation component to modulate the phase of the light signal of the red color channel according to the modulation signal corresponding to the light signal of the red color channel.

[0205] It should be noted that the modulation signal is a signal used to control the modulation component to change certain characteristics (e.g., amplitude, frequency, or phase) of the light signal. Common types of modulation signals include: amplitude modulation signals that change the amplitude of the light signal; frequency modulation signals that change the frequency of the light signal; phase modulation signals that change the phase of the light signal; pulse width modulation signals that change the pulse width of the light signal.

[0206] In this embodiment, after the display driving circuit sends the first enable signal to the phase light modulation component, the phase light modulation component can accurately and quickly control the phase light modulation component to modulate the light signal of the color channel to be modulated by triggering the modulation signal corresponding to the color channel of the phase light modulation component.

[0207] In some embodiments, the phase light modulation component modulates the phase of the light signal of the second color channel according to the modulation signal corresponding to the second color channel, including: the phase light modulation component, according to the modulation signal corresponding to the second color channel, obtaining a target phase map corresponding to the second color channel, and modulating the phase of the light signal corresponding to the second color channel according to the target phase map.

[0208] Each color channel has its unique phase map, which is an image representing the phase distribution of light waves. The phase map of each color channel contains the phase distribution information of the light signal of each color channel at each position in space to control the reflection direction of light. The phase map can help the phase light modulation component accurately modulate the light signal of the corresponding color channel according to the phase map corresponding to each color channel, so that the final projection display device can successfully project and display the image signal or video signal with improved contrast.

[0209] For example, as shown in FIG. 11, during the s1 period, the light source is emitting the light signal of the R channel. At this time, the phase light modulation component will load the R phase map and modulate the phase of the light signal of the R channel during the s1 period. During the s2 period, the light source is emitting the light signal corresponding to the G channel. At this time, the phase light modulation component will load the G phase map and modulate the phase of the light signal of the G channel during the s2 period. During the s3 period, the light source is emitting the light signal corresponding to the B channel. At this time, the phase light modulation component will load the B phase map and modulate the phase of the light signal of the B channel during the s3 period. During the s4 period, the light source is emitting the light signal corresponding to the R channel. At this time, the phase light modulation component will load the R phase map and modulate the phase of the light signal of the R channel during the s4 period. Based on this, when the light source is emitting the light signal of a certain color channel, the phase light modulation component loads the phase map corresponding to the color channel of the light signal and modulates the phase of the light signal of the color channel according to the phase map, thereby completing the phase modulation.

[0210] In this embodiment, the phase light modulation component can more accurately modulate the phase of the light signal corresponding to each color channel according to the phase map corresponding to the color channel, so that the displayed image and video after the modulated light signal is projected and displayed by the lens of the projection display device are the same as the contrast light parameters corresponding to the projection signal, further improving the display effect of the image or video.

[0211] In some embodiments, since the modulation duration of the phase map of each color channel in the phase light modulation component needs to match the modulation duration of each color channel of the amplitude light modulation component, the modulation duration of the light signal of each color channel (for example, the modulation durations of the R, G, and B channels are s11, s21, and s31, respectively) is determined according to the signal frequency of the amplitude light modulation component. For example, when the signal frequency of the amplitude light modulation component is 240 Hz, the modulation duration of each color channel is s11, s21, and s31, respectively, and s11, s21, and s31 need to satisfy s11+s21+s31=1 / 240.

[0212] It should be noted that, under the premise of satisfying s11+s21+s31=1 / 240, the modulation time lengths s11, s21, s31 of the light signals of each color channel can be set as required, and the application does not limit this. For example, s11, s21, s31 can be in a 1:1:1 relationship, or in a 1:2:1 relationship.

[0213] In some embodiments, the phase light modulation assembly includes a phase light modulation driving circuit and a phase light modulator, and the phase light modulation driving circuit includes a preset memory. The phase light modulation assembly obtains a target phase map corresponding to a second color channel according to a modulation signal corresponding to the second color channel, and modulates the phase of a light signal corresponding to the second color channel according to the target phase map, including: the phase light modulation driving circuit obtains the target phase map from the preset memory according to the modulation signal corresponding to the second color channel, and sends the target phase map to the phase light modulator; the phase light modulator modulates the phase of the light signal corresponding to the second color channel according to the target phase map after receiving the target phase map.

[0214] In this embodiment, the phase map is pre-stored in the preset memory of the phase light modulation driving circuit. When the modulation signal of the phase light modulation assembly is triggered, the phase light modulation driving circuit can quickly obtain the phase map corresponding to the color channel, and send the phase map to the phase light modulator to realize phase modulation. This way improves the processing efficiency of the phase light modulation assembly for phase modulation, thereby improving the display efficiency of the projection display device.

[0215] In some embodiments, before the phase light modulation assembly obtains a target phase map corresponding to a second color channel according to a modulation signal corresponding to the second color channel, and modulates the phase of a light signal corresponding to the second color channel according to the target phase map, it further includes: the phase light modulation driving circuit sends a projection signal to the phase light modulation assembly; the phase light modulation assembly calculates the phase map of each color channel corresponding to the projection signal by using a target phase recovery algorithm through a phase recovery algorithm unit after receiving the projection signal, and the phase map of each color channel includes the target phase map.

[0216] The target phase recovery algorithm includes a Gerchberg-Saxton algorithm. Using the Gerchberg-Saxton algorithm can effectively recover a high-precision phase map, thereby ensuring that the phase light modulator can more accurately modulate the phase of the light signal.

[0217] It should be noted that when the phase light modulation device modulates the phase of the optical signal of each color channel, the phase information in the spatial light field is needed. Since the phase information cannot be measured, the phase map of each color channel can be calculated by using the phase recovery algorithm. It should be noted that the skilled person in the art can use other phase recovery algorithms as the target phase recovery algorithm according to actual needs, for example, the Fienup algorithm, which is not limited in the present application.

[0218] In some embodiments, after the phase recovery algorithm unit calculates the phase map of each color channel corresponding to the projection signal by using the target phase recovery algorithm, the phase recovery algorithm unit further comprises: the phase recovery algorithm unit sends the phase map of each color channel to the phase dimming driving circuit; and the phase dimming driving circuit stores the phase map of each color channel in the preset memory after receiving the phase map of each color channel.

[0219] In this embodiment, the phase recovery algorithm unit stores the phase map in the preset memory of the phase dimming driving circuit after calculating the phase map of each color channel, which facilitates the subsequent phase light modulation assembly to call the phase map and improves the phase modulation efficiency.

[0220] Further, in order to further illustrate the phase light modulation assembly disclosed in the above embodiments in more detail, please refer to FIG. 12, which is a structural schematic diagram of the phase light modulation assembly disclosed in the embodiments of the present application. The phase light modulation assembly shown in FIG. 12 comprises a phase recovery algorithm unit 910, a phase dimming driving circuit 920 and a phase light modulation device 930. The phase dimming driving circuit 920 comprises a preset memory Flash, wherein:

[0221] The phase recovery algorithm unit 910 is configured to calculate the phase map of each color channel corresponding to the projection signal by using the target phase recovery algorithm, and store the phase map of each color channel in the preset memory Flash of the phase dimming driving circuit 920.

[0222] The phase dimming driving circuit 920 is configured to obtain the phase map corresponding to each color channel from the preset memory Flash, and send the phase map corresponding to each color channel to the phase light modulation device 930.

[0223] The phase light modulation device 930 is configured to modulate the phase of the optical signal corresponding to each color channel according to the phase map corresponding to each color channel.

[0224] For example, the phase recovery algorithm unit 910 obtains the phase maps of the R, G, and B color channels after the static color image is calculated by the target phase recovery algorithm, stores the three color channel phase maps in the preset memory Flash of the phase dimming driving circuit 920, and the preset memory Flash can store the phase maps of the three color channels of multiple different static images. Further, the phase dimming driving circuit 920 obtains the phase maps of the R, G, and B color channels stored in the preset memory Flash according to the modulation signals corresponding to R, G, and B, and sends the phase maps of the R, G, and B color channels to the phase light modulation device 930. Further, the phase light modulation device 930 modulates the light signals corresponding to the R, G, and B color channels according to the received phase maps of the R, G, and B color channels, respectively.

[0225] In some embodiments, the phase recovery algorithm unit employs a target phase recovery algorithm to calculate the phase maps of the color channels corresponding to the projection signal, including: the phase recovery algorithm unit obtains the initial amplitude distribution information and the initial phase distribution information of the light signals of each color channel emitted by the light source at the phase light modulation device; analyzes the projection signal to obtain the expected amplitude distribution information and the expected phase distribution information corresponding to the projection signal; and employs the target phase recovery algorithm to calculate the phase maps of the color channels corresponding to the projection signal according to the initial amplitude distribution information, the initial phase distribution information, the expected amplitude distribution information, and the expected phase distribution information.

[0226] For example, taking the Gerchberg-Saxton algorithm as an example, the principle of the Gerchberg-Saxton algorithm is to use the known light field amplitude distribution information (intensity) of the input face (the light signals emitted by the light source at the phase light modulation device) and the output face (the light signals modulated by the phase light modulation device and emitted to the amplitude light modulation assembly), and the light field transformation relationship between the input face and the output face, to obtain the phase maps of the color channels corresponding to the projection signal, i.e., the light field phase information, through diffraction calculation iteration. Specifically:

[0227] The amplitude distribution information and the phase distribution information of the light signals emitted by the light source at the phase light modulation device can be represented by a light wave function f(x, y):

[0228] f(x, y) = A(x, y)exp(iΦ(x, y));

[0229] wherein A(x, y) represents the amplitude distribution information at the phase light modulation device, Φ(x, y) represents the phase distribution information at the phase light modulation device, A(x, y) can be detected and is a known quantity, the initial phase distribution information of Φ(x, y) can be preset, and (x, y) represents the point coordinates of the light signal at the input face.

[0230] The amplitude distribution information and the phase distribution information at the output surface after the phase of the light signal emitted by the light source is modulated by the phase light modulation device can be represented by a light wave function g(u, v):

[0231] g(u, v) = B(u, v)exp(iθ(u, v));

[0232] wherein B(u, v) represents the expected amplitude distribution information at the output surface after the phase modulation, θ(u, v) represents the expected phase distribution information at the output surface after the phase modulation, and (u, v) represents the point coordinates of the modulated light signal at the output surface. Since the light intensity information after the modulation depends on the image signal or the video signal, the expected amplitude distribution information B(u, v) is known.

[0233] The above light wave functions f and g satisfy the following light field transformation relationship:

[0234] g = F(f), f = F -1 (g);

[0235] wherein F represents the Fourier transform, and F -1 represents the inverse Fourier transform. Therefore, the light wave function at the output surface can be obtained by the Fourier transform of the light wave function at the input surface, and the light wave function at the input surface can be obtained by the inverse Fourier transform of the light wave function at the output surface.

[0236] Based on this, the specific iteration process of the Gerchberg-Saxton algorithm is as follows:

[0237] Step S11, estimate the initial phase distribution information Φ0(x, y); n is the number of cycles.

[0238] Step S12, perform the Fourier transform on the light wave function f(x, y) = A(x, y)exp(iΦ0(x, y)) at the input surface to obtain the light wave function g'(u, v) = B'(u, v)exp(iθ n (u, v)), and obtain the phase relationship θ n (u, v).

[0239] Step S13, replace the phase information in the light wave function at the output surface with θ n (u, v) to obtain g(u, v) = B(u, v)exp(iθ n (u, v)).

[0240] Step S14, perform the inverse Fourier transform on the light wave function g(u, v) = B(u, v)exp(iθ n (u, v)) at the output surface to obtain f'(x, y) = A'(x, y)exp(iΦn (x, y).

[0241] In step S15, it is determined whether the mean square error of the output amplitude B'(u, v) and B(u, v) is less than a predetermined index ε or a certain number of iteration operation times K, if not, step S16 is executed, and if yes, step S17 is executed; wherein the index ε and the number of iteration operation times K can be any preset parameters, which are not limited in the present application.

[0242] In step S16, Φ n (x, y) is replaced in the phase information in the light wave function at the input surface, and step S12 is repeatedly executed.

[0243] In step S17, the phase recovery operation is completed, and Φ k (x, y) is the phase distribution function required by the phase light modulation device to represent the phase information, that is, the phase map corresponding to each color channel.

[0244] In this embodiment, the Gerchberg-Saxton algorithm is used to iteratively calculate the amplitude distribution information and the phase distribution information, so that the phase map of each color channel corresponding to the projection signal can be accurately recovered, so as to improve the accuracy of phase modulation of the phase light modulation device, thereby ensuring that the projection display device can correctly display the image or video after contrast enhancement.

[0245] In step 703, the amplitude light modulation component modulates the light signal of the second color channel after being modulated by the phase light modulation component after receiving the second enable signal.

[0246] In some embodiments, the amplitude light modulation component modulates the light signal of the second color channel after being modulated by the phase light modulation component after receiving the second enable signal, including: the amplitude light modulation component, after receiving the second enable signal, triggers the modulation signal corresponding to the second color channel in the amplitude light modulation component in response to the second enable signal; and modulates the light signal corresponding to the second color channel after being modulated by the phase light modulation component according to the modulation signal corresponding to the second color channel.

[0247] It should be noted that the modulation signal in the amplitude light modulation component has the same effect as the modulation signal in the phase light modulation component, that is, the modulation signal in the amplitude light modulation component is used to control the amplitude light modulation component to modulate the light signal of the corresponding color after being modulated by the phase light modulation component. For the modulation signal in the phase light modulation component in step 702, the present application will not be repeated here.

[0248] For example, if the amplitude light modulation assembly is a Digital Micromirror Device (DMD). The Digital Micromirror Device can control the tilt angle of each mirror (for example, the flip of a positive angle or a negative angle) according to the modulation signal corresponding to the second color channel, so as to modulate the light signal of the second color channel modulated by the phase light modulation assembly. The light signal of each pixel can be accurately controlled by the mirror to be reflected to the lens, and the modulated light signal is projected through the lens to realize the display of the image or video corresponding to the projection signal.

[0249] In this embodiment, after the display driving circuit sends the second enable signal to the amplitude light modulation assembly, the modulation signal of the corresponding color channel of the amplitude light modulation assembly can be triggered to accurately and quickly control the amplitude light modulation assembly to modulate the light signal of the color channel to be modulated after being modulated by the phase light modulation assembly. Since the second enable signal sent by the display driving circuit to the amplitude light modulation assembly is also used to drive the amplitude light modulation assembly to modulate the light signal of the same color channel after being modulated by the phase light modulation assembly, the display driving circuit can simultaneously drive the phase light modulation assembly and the amplitude light modulation assembly to modulate the light signal of the same color channel, so as to realize the synchronization of the phase light modulation assembly and the amplitude light modulation assembly.

[0250] In order to ensure the synchronization of the modulation timing of the phase light modulation assembly and the amplitude light modulation assembly, in the related art, an image or video processing system is arranged in the projection display device, and the image or video processing system includes an image processing chip. For example, the image processing chip includes a Field Programmable Gate Array (FPGA), a Graphics Processing Unit (GPU), etc., and the image processing chip is used to control the phase light modulation assembly and the amplitude light modulation assembly to modulate the light signal. However, this method usually has a high cost and needs to additionally increase the hardware device of the projection display device. For example, in the prior art, after the image or video processing system obtains the projection signal, the projection signal is sent to the display driving circuit, the display driving circuit sends an enable signal to the amplitude light modulation assembly, and the image or video processing system sends an enable signal to the phase light modulation assembly. It can be seen that the prior art drives the phase light modulation assembly to work through the image or video processing system, and this control method may cause the phase light modulation assembly and the amplitude light modulation assembly not to be completely synchronized in the same timing sequence due to the delay problem of the image or video processing system and the display driving circuit during operation.

[0251] The projection display device provided by the embodiments of the present application does not need to additionally install an image processing chip in an image or video processing system, but directly acquires a projection signal through a display driving circuit, detects a pulse falling edge of a timing signal of a light signal of a previous color channel emitted by a light source when the pulse falling edge of the timing signal of the previous color channel is detected, and simultaneously directly drives a phase light modulation assembly and an amplitude light modulation assembly to modulate the light signal emitted by the light source, so as to achieve the purpose of controlling the modulation timing of the phase light modulation assembly and the amplitude light modulation assembly to be synchronous.

[0252] It can be seen that, by implementing the embodiments of the present application, the phase light modulation assembly and the amplitude light modulation assembly are driven to modulate a light signal of a next color channel by detecting a pulse falling edge of a timing signal of a previous color channel through a display driving circuit, the modulation sequence of the phase light modulation assembly and the amplitude light modulation assembly can be more accurately controlled to be synchronous and matched, the projection display device can correctly display an image or video with improved contrast, display problems such as color misplacement and blurring are effectively avoided, and the quality of projection display is improved; and no other image processing chip needs to be additionally arranged on the projection display device to process the projection signal, the projection display device can display an image or video with improved contrast at low cost and quickly. In some embodiments, an image signal system can process image signals of different formats, and the signal format output by each processing unit can refer to Table 1 shown below for different formats of image signals.

[0253] Table 1

[0254] As shown in Table 1, when the video signal format output by the multimedia unit is 3840ⅹ2160@60Hz, it is assumed that the current scene is determined to be a first scene, therefore the image processing unit outputs a signal format of 1 route of 3840ⅹ2160@60Hz VB1 video signal (first signal) and 1 route of 2560ⅹ1600@60Hz DP (Display port) video signal (second signal). When the video signal format output by the multimedia unit is 1920ⅹ1080@120Hz or 1920ⅹ1080@240Hz, it is assumed that the current scene is determined to be a second scene, therefore the image processing unit only outputs 1 route of 1920ⅹ1080@120Hz video signal (third signal) or 1920ⅹ1080@240Hz video signal (third signal).

[0255] FIG. 13 is a flowchart of a projection display method provided by the present application. As shown in FIG. 13, on the basis of the above embodiments, for example, on the basis of the embodiment shown in FIG. 6, a processing process of a second scene is added, and the method comprises the following steps:

[0256] 601、receiving an image signal of a signal source.

[0257] 602、determining a current scene, if the current scene is a first scene, performing step 603, if the current scene is a second scene, performing step 607.

[0258] 603、generating a first signal and a second signal which are mutually synchronized according to the image signal; the first signal is used to represent image content of the image signal, and the second signal is used to represent brightness of at least one partition in an image frame of the image signal.

[0259] 604、processing the first signal to obtain a first amplitude modulation driving signal.

[0260] 605、processing the second signal to obtain a phase modulation driving signal.

[0261] 606、performing imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal.

[0262] 607、generating a third signal according to the image signal through a low-latency channel in the image processing unit; the third signal is used to represent image content of the image signal; a signal processing time length of the low-latency channel is less than a signal processing time length of the high-contrast channel.

[0263] 608、generating a second amplitude modulation driving signal according to the third signal.

[0264] 600、performing imaging display according to the second amplitude modulation driving signal.

[0265] Specifically, as shown in FIG. 7c, the image processing unit 502 further includes a low-latency channel, which can include a VB1 signal input subunit 5026 and a VB1 signal output subunit 5027. It does not include processing units such as the phase map processing subunit 5022 and the resolution scaling subunit 5023 in the phase modulation channel, which have relatively long processing time. Therefore, the third signal is generated through the low-latency channel, which can meet the requirement of low latency.

[0266] In some embodiments, the phase light modulation assembly is further configured to, in the second scene, totally reflect the laser beam, and output the totally reflected laser beam to the amplitude light modulation assembly.

[0267] The amplitude light modulation assembly is further configured to, in the second scene, modulate the totally reflected laser beam according to the second amplitude modulation driving signal, obtain a second image beam, and output the second image beam to the lens.

[0268] The lens is further configured to project the second image beam to form an image.

[0269] In some embodiments, the display driving control unit comprises:

[0270] The galvanometer is set to an open state in the first scenario, and performs pixel expansion on the first signal, and is set to a closed state in the second scenario.

[0271] The time delay in the processing of each unit in the image signal system is analyzed below in combination with FIG. 14. As shown in FIG. 14, the processing time of the multimedia unit on the image signal is t1, the processing time of the image processing unit on the image signal is t2, and the processing time of the display driving control unit on the image signal is t3. The total image processing delay Ttotal = t1 + t2 + t3. For different resolutions of the signal source content input to the multimedia unit, the input signal source content is processed differently in each unit, resulting in different t1, t2, and t3. In order to match the best image processing mode for each signal source content, different scenarios can be determined for different input signal source content, and different display strategies can be adopted for different scenarios. For example, the scenarios can be divided into a first scenario (e.g., when watching a movie) and a second scenario (e.g., when playing a game).

[0272] Different display strategies in different scenarios are exemplarily illustrated below in combination with FIG. 15. It is assumed that the scenarios include the first scenario when watching a movie and the second scenario when playing a game.

[0273] As shown in FIG. 15, in the second scenario, the image processing unit does not output the DP signal, i.e., no phase modulation signal is input to the imaging display unit, and the phase modulation device in the imaging display unit is set to a full reflection state. In the imaging display process, only the amplitude modulation of the laser beam based on the third signal output by the image processing unit is used to realize the imaging display. In addition, in order to further reduce the delay, the galvanometer in the display driving control unit is turned off.

[0274] For example, in the second scenario, the video signal format and content input by the input device to the multimedia unit are game content, the image mode in the multimedia unit is set to a game mode, and the resolution and frame rate of the input signal are detected by the multimedia unit.

[0275] The image processing unit receives the input signal of the multimedia unit, the phase map calculation module of the image processing unit does not perform calculation, the signal output at the VB1 port of the image processing unit, and the DP port does not output the signal. The image processing unit outputs the signal to the display driving control unit, and the frame rate and resolution of the output signal automatically follow the frame rate and resolution of the input signal, i.e., the frame rate and resolution of the signal output at the VB1 port are consistent with the frame rate and resolution of the input signal of the multimedia unit.

[0276] The DLP processing unit of the display driving control unit then converts the frame rate format of the received signal, while controlling the galvanometer switch and setting the frequency of the Duty signal of the laser. For example, the display resolution is set to 1920 x 1080 @ 240Hz or 1920 x 1080 @ 120Hz, while the galvanometer is turned off and the Duty signal frequency of the laser is controlled to be 240Hz or 120Hz.

[0277] The DLP processing unit outputs the image primary color enable signals (R_EN, G_EN, B_EN) to the laser driving unit and the phase light modulation driving unit, and the laser driving unit controls the opening, closing and brightness of the laser light source. The phase light modulation driving unit controls the phase light modulation device to be set to the full reflection state according to the image primary color enable signals. The DMD imaging display unit performs imaging display according to the signals output by the display driving control unit and the phase light modulation driving unit, and the projection lens displays the image.

[0278] In the first scenario, the image processing unit outputs the DP signal, i.e., the second signal. During the imaging display process, the phase modulation device in the imaging display unit is set to the phase adjustment state, and the dynamic contrast of the display is improved by phase modulation of the laser beam. Correspondingly, since the low latency requirement is not high, the galvanometer can be set to the open state for better display effect.

[0279] For example, in the first scenario, the format and content of the video signal input by the input device to the multimedia unit are video content, the image mode in the multimedia unit is set to the viewing mode, and the multimedia unit detects the resolution and frame rate of the input signal.

[0280] The image processing unit receives the input signal of the multimedia unit, and the phase map calculation module of the image processing unit calculates the image phase map. The DP port of the image processing unit outputs a 2560 x 1600 @ 60Hz video image backlight partition signal, and the VB1 outputs a 3840 x 2160 @ 60Hz image content signal.

[0281] The image processing unit outputs the signal to the display driving control unit and the imaging display unit, and the frame rate and resolution of the output signal automatically follow the frame rate and resolution of the input signal. That is, the signal output by the VB1 port to the display driving control unit is a 3840 x 2160 @ 60Hz image content signal. The signal output by the DP port to the imaging display unit is a 2560 x 1600 @ 60Hz backlight partition signal.

[0282] Then the DLP processing unit of the display driving control unit converts the frame rate format of the received signal, at the same time, controls the mirror switch and sets the Duty signal frequency of the laser. For example, the display resolution is set to 3840x2160@600Hz. At the same time, the mirror is turned on, and the Duty signal frequency of the laser is controlled to be 240Hz.

[0283] The DLP processing unit outputs the image primary color enable signals (R_EN, G_EN, B_EN) to the laser driving unit and the phase dimming driving unit. The laser driving unit controls the opening, closing and brightness of the laser light source, and the phase dimming driving unit performs phase adjustment. According to the image primary color enable signals and the output signals of the DP port, the phase dimming device is controlled to be in a phase adjustment state. The DMD imaging display unit performs imaging display according to the signals output by the display driving control unit and the phase dimming driving unit, and the projection lens displays the image.

[0284] It can be seen that when the game image content and the video image content are input, the processing time of the image processing unit for the video image is t2, and the processing time of the display driving system unit for the video image is t3, which are different. When the video image content is input, the image processing unit generally needs to perform buffering processing to ensure that the output VB1 signal and the DP signal are synchronized, so as to ensure that the two-way video signals are synchronized, and therefore the time t2 required by the video image is greater than the time t2 of the game content. When processing the game content, the display driving system unit closes the mirror, reduces the resolution, and increases the frame rate to ensure that the delay time t3 is minimized. When processing the video image content, the display driving system unit ensures high resolution 3840x2160@60Hz, and the mirror is turned on. The front-end input 1 frame 60Hz image is processed into 4 sub-frame images with a frame rate of 240Hz, which increases the delay time t3.

[0285] In summary, by using different image processing methods for different signal source contents, the high image dynamic contrast and high resolution are ensured when watching the video image for the first scene, and the display effect of the image is improved, but the image delay is the largest at this time. For the second scene, when the game content is input, the image delay caused by buffering processing is reduced to minimize the delay and improve the smoothness experience in the game mode.

[0286] It should be understood that the term "one embodiment" or "an embodiment" or "some embodiments" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" or "in some embodiments" in various places throughout the specification are not necessarily referring to the same embodiment. Further, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that the sequence of steps in the above-described processes is not necessarily the sequence in which the steps are performed, and the embodiments of the application can be performed in any suitable order. The sequence of the above-described embodiments is merely for description, and does not represent the advantages or disadvantages of the embodiments. The above description of the various embodiments tends to emphasize differences between the various embodiments, and the same or similar elements can be referred to each other, and for brevity, will not be described herein.

[0287] The term "and / or", merely describes an associated relationship, which means that there can be three relationships, for example, object A and / or object B, which can represent three cases: object A exists alone, object A and object B exist together, and object B exists alone.

[0288] It should be noted that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0289] In the embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. The embodiments described above are only illustrative, for example, the division of the modules is only a logical function division, and in actual implementation, another division mode can be used, for example, a plurality of modules or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the various components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0290] The modules described above as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules; they can be located in one place or distributed on multiple network units; and part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0291] In addition, each functional module in each embodiment of the present application can be integrated in one processing unit, or each module can be a separate unit, or two or more modules can be integrated in one unit; the integrated module can be realized in the form of hardware or in the form of hardware plus software functional unit.

[0292] Those skilled in the art can understand that all or part of the steps of the above method embodiments can be completed by program instruction related hardware, and the above program can be stored in a computer readable storage medium, and the program executes the steps including the above method embodiments when executed; and the above storage medium includes mobile storage device, read only memory (ROM), magnetic disc or optical disc and various storage program codes.

[0293] Alternatively, the integrated units of the present application, if implemented in the form of software functional modules and sold or used as independent products, can also be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products, which are stored in a storage medium and include a number of instructions for causing an electronic device to execute all or part of the methods described in the embodiments of the present application. The above storage medium includes mobile storage device, ROM, magnetic disc or optical disc and various storage program codes. Therefore, the embodiments of the present application are not limited to any specific hardware and software combination.

[0294] The above is only an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A projection display device, characterized by comprising: The projection display device comprises: a multimedia processing unit configured to receive an image signal of a signal source; an image processing unit connected to the multimedia processing unit and configured to determine a current scene, and if the current scene is a first scene, generate a first signal and a second signal which are mutually synchronized according to the image signal through a phase modulation channel in the image processing unit; the first signal is used to represent image content of an image frame of the image signal, and the second signal is used to represent brightness of at least one partition in the image frame of the image signal; a display driving control unit connected to the image processing unit and configured to process the first signal to obtain a first amplitude modulation driving signal; a display image phase execution unit connected to the image processing unit and configured to process the second signal to obtain a phase modulation driving signal; an imaging display unit connected to the display driving control unit and the display image phase execution unit and configured to perform imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal.

2. The display device of claim 1, wherein, The phase modulation channel comprises: a phase map processing subunit connected to the multimedia processing unit and configured to divide a to-be-displayed image frame of the image signal into a plurality of partitions, determine brightness of the plurality of partitions according to statistical features of corresponding images of the plurality of partitions, and obtain a phase map corresponding to the to-be-displayed image frame of the image signal.

3. The display device of claim 2, wherein, The phase modulation channel further comprises: a resolution scaling subunit connected to the phase map processing subunit and configured to perform resolution adjustment on the phase map corresponding to the to-be-displayed image frame of the image signal to obtain the first signal and the second signal, and synchronously output the first signal and the second signal based on a target clock signal.

4. The display device of claim 1, wherein, The projection display device further comprises: a projection screen configured to display image content; the image content comprises a scene selection interface; the scene selection interface comprises a selection control; The image processing unit is further configured to determine the current scene in response to a touch operation on the selection control.

5. The display device of claim 4, wherein, The image processing unit is further configured to identify a refreshing action of a user on a display interface of the projection screen, and determine the current scene according to an identification result.

6. The display device of claim 1, wherein, The image processing unit is further configured to obtain a refresh rate of the image signal, and determine the current scene according to the refresh rate.

7. The display device according to any of claims 1-6, characterized in that, The image processing unit is further configured to, if the current scene is a second scene, generate a third signal according to the image signal through a low-delay channel in the image processing unit; the third signal is used to represent image content of the image signal; a signal processing time length of the low-delay channel is less than a signal processing time length of the high-contrast channel; The display driving control unit is further configured to generate a second amplitude modulation driving signal according to the third signal; The imaging display unit is further configured to perform imaging display according to the second amplitude modulation driving signal.

8. The display device of claim 7, wherein, The display driving control unit is further configured to generate a primary color synchronization signal; the primary color synchronization signal is used to represent lighting timing of a plurality of primary color lasers; The imaging display unit comprises: a light source configured to sequentially emit light signals of each color channel according to the primary color synchronization signal; The phase light modulation component is configured to, in a first scenario, be set to a phase modulation state, modulate the laser beam according to the phase modulation driving signal, and generate a phase-modulated laser beam; The amplitude light modulation component is configured to modulate the phase-modulated laser beam according to the first amplitude modulation driving signal, and obtain a first image beam; The lens is configured to obtain the first image beam of the amplitude light modulation component, and project the first image beam.

9. The display device of claim 7, wherein, The display driving control unit comprises: The galvanometer is configured to, in a first scenario, be set to an open state, perform pixel expansion on the first signal, and be set to a closed state in a second scenario.

10. The display device of claim 8, wherein, The phase light modulation device is further configured to, in the second scenario, fully reflect the laser beam, and output the fully reflected laser beam to the amplitude light modulation component; The amplitude light modulation component is further configured to, in the second scenario, modulate the fully reflected laser beam according to the second amplitude modulation driving signal, obtain a second image beam, and output the second image beam to the lens; The lens is further configured to project the second image beam.

11. The display device of claim 8, wherein, The projection display device comprises: The display driving circuit is configured to obtain a projection signal, and drive the light source, the phase light modulation component, and the amplitude light modulation component to work, The projection signal is an image signal or a video signal in the first scenario; When the timing signal of the first color channel is a pulse falling edge, the display driving circuit sends a first enable signal of a second color channel to the phase light modulation component, and sends a second enable signal of the second color channel to the amplitude light modulation component, the second color channel being a next color channel of the first color channel in the modulation sequence; The phase light modulation component modulates the phase of the light signal of the second color channel after receiving the first enable signal; The amplitude light modulation component modulates the light signal of the second color channel after the phase light modulation component after receiving the second enable signal.

12. The projection display apparatus according to claim 11, wherein In the case that the projection signal is the video signal, the projection display device further comprises: When the timing signal of a third color channel of a first frame signal of the video signal is a pulse rising edge, the display driving circuit sends a third enable signal corresponding to the third color channel to the phase light modulation component, and sends the third enable signal of the third color channel to the amplitude light modulation component, the third color channel being a first color channel in the modulation sequence; The phase light modulation component modulates the phase of the light signal of the third color channel after receiving the third enable signal; The amplitude light modulation component modulates the light signal of the third color channel after the phase light modulation component after receiving the third enable signal.

13. The projection display apparatus according to claim 11 or 12, wherein The phase light modulation component modulates the phase of the light signal of the second color channel after receiving the first enable signal, comprising: The phase light modulation component, in response to the first enable signal, triggers a modulation signal corresponding to the second color channel in the phase light modulation component after receiving the first enable signal; and modulates the phase of the light signal corresponding to the second color channel according to the modulation signal corresponding to the second color channel.

14. The projection display apparatus according to claim 13, wherein The phase light modulation component modulates the phase of the light signal corresponding to the second color channel according to the modulation signal corresponding to the second color channel, including: The phase light modulation component acquires a target phase map corresponding to the second color channel according to the modulation signal corresponding to the second color channel, and modulates the phase of the light signal corresponding to the second color channel according to the target phase map.

15. The projection display apparatus according to claim 14, wherein The phase light modulation component includes a phase dimming driving circuit and a phase light modulation device, the phase dimming driving circuit includes a preset memory, the phase light modulation component acquires a target phase map corresponding to the second color channel according to the modulation signal corresponding to the second color channel, and modulates the phase of the light signal corresponding to the second color channel according to the target phase map, including: The phase dimming driving circuit acquires the target phase map from the preset memory according to the modulation signal corresponding to the second color channel, and sends the target phase map to the phase light modulation device; The phase light modulation device modulates the phase of the light signal corresponding to the second color channel according to the target phase map after receiving the target phase map.

16. The projection display device according to claim 14 or 15, wherein The phase light modulation component further includes a phase recovery algorithm unit, before the phase light modulation component acquires a target phase map corresponding to the second color channel according to the modulation signal corresponding to the second color channel, and modulates the phase of the light signal corresponding to the second color channel according to the target phase map, further including: The phase dimming driving circuit sends the projection signal to the phase light modulation component; The phase light modulation component, after receiving the projection signal, calculates the phase map of each color channel corresponding to the projection signal by using a target phase recovery algorithm through the phase recovery algorithm unit, and the phase map of each color channel includes the target phase map; The target phase recovery algorithm includes a Gerchberg-Saxton algorithm.

17. The projection display apparatus according to claim 16, wherein After the phase recovery algorithm unit calculates the phase map of each color channel corresponding to the projection signal by using a target phase recovery algorithm, further including: The phase recovery algorithm unit sends the phase map of each color channel to the phase dimming driving circuit; The phase dimming driving circuit, after receiving the phase map of each color channel, stores the phase map of each color channel in the preset memory.

18. The projection display apparatus according to claim 16, wherein The phase recovery algorithm unit calculates the phase map of each color channel corresponding to the projection signal by using a target phase recovery algorithm, including: The phase recovery algorithm unit obtains initial amplitude distribution information and initial phase distribution information of the light signals of the respective color channels emitted by the light source at the phase light modulation device; analyzes the projection signal to obtain expected amplitude distribution information and expected phase distribution information corresponding to the projection signal; and calculates the phase map of the respective color channels by using the target phase recovery algorithm according to the initial amplitude distribution information, the initial phase distribution information, the expected amplitude distribution information, and the expected phase distribution information.

19. The projection display apparatus according to claim 11, wherein The display driving circuit includes a micro control unit (MCU), and when the timing signal of the first color channel is a pulse falling edge, the display driving circuit sends a first enable signal of a second color channel to the phase light modulation assembly and sends a second enable signal of the second color channel to the amplitude light modulation assembly, including: When the timing signal of the first color channel is a pulse falling edge, the display driving circuit sends a first enable signal of a second color channel to the phase light modulation assembly through the MCU and sends a second enable signal of the second color channel to the amplitude light modulation assembly through the MCU.

20. The projection display apparatus according to claim 11, wherein The timing signal is a periodic pulse signal.

21. The projection display apparatus according to claim 15, wherein The projection display device further includes a light source driving circuit, wherein: The display driving circuit sends a light source driving signal to the light source driving circuit, and the light source driving signal includes the modulation sequence; After receiving the light source driving signal, the light source driving circuit drives the light source to emit the light signals of the respective color channels to the phase light modulation device according to the modulation sequence.

22. A projection display method characterized by comprising: including: receiving an image signal of a signal source; determining a current scene, and if the current scene is a first scene, generating a first signal and a second signal that are mutually synchronized according to the image signal; the first signal is used to represent image content of an image frame of the image signal, and the second signal is used to represent brightness of at least one partition in the image frame of the image signal; processing the first signal to obtain a first amplitude modulation driving signal; processing the second signal to obtain a phase modulation driving signal; performing imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal.

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