Projection display device and method

Abstract

The embodiment of the invention belongs to the display technology, and provides a projection display device and method.The projection display device comprises an image processing unit used for determining a current scene, and if the current scene is a high-contrast scene, a phase modulation channel in the image processing unit is used for performing phase modulation on the high-contrast scene; generating a first signal and a second signal which are synchronous with each other according to the image signal; 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; the display driving control unit is used for processing the first signal to obtain a first amplitude modulation driving signal; the display image phase execution unit is used for processing the second signal to obtain a phase modulation driving signal; and the imaging display unit is used for performing imaging display according to the first amplitude modulation driving signal and the phase modulation driving signal. According to the equipment provided by the invention, the dynamic contrast of the projection display equipment is improved.

Description

Technical Field

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

[0002] Currently, judging from the product technology development trend of display devices, users have increasingly higher requirements for the brightness, contrast, clarity, and color of display devices.

[0003] Improving the contrast ratio of projection display devices is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This application provides a projection display device and method to improve the dynamic contrast of projected images.

[0005] In a first aspect, embodiments of this application provide a projection display device, the projection display device comprising:

[0006] A multimedia processing unit is used to receive image signals from a signal source;

[0007] An image processing unit, connected to the multimedia processing unit, is used to determine the current scene. If the current scene is a high-contrast scene, the image processing unit generates a first signal and a second signal that are synchronized with each other based on the image signal through the phase modulation channel in the image processing unit. The first signal is used to characterize the image content of the image frame of the image signal, and the second signal is used to characterize the brightness of at least one partition in the image frame of the image signal.

[0008] The display driving control unit is connected to the image processing unit and is used to process the first signal to obtain the first amplitude modulation driving signal.

[0009] The display image phase execution unit is connected to the image processing unit and is used to process the second signal to obtain a phase modulation drive signal;

[0010] An imaging display unit, connected to the display driving control unit and the display image phase execution unit, is used to perform imaging display based on the first amplitude modulation driving signal and the phase modulation driving signal.

[0011] In some embodiments of this application, the phase modulation channel includes:

[0012] The phase map processing subunit, connected to the multimedia processing unit, is used to divide the image frame to be displayed of the image signal into multiple partitions, determine the brightness of the multiple partitions according to the statistical characteristics of the images corresponding to the multiple partitions, and obtain the phase map corresponding to the image frame to be displayed of the image signal.

[0013] In some embodiments of this application, the phase modulation channel further includes:

[0014] The resolution scaling subunit, connected to the phase map processing subunit, is used to adjust the resolution of the phase map corresponding to the image frame to be displayed of the image signal, obtain a first signal and a second signal, and output the first signal and the second signal synchronously based on the target clock signal.

[0015] In some embodiments of this application, the projection display device further includes:

[0016] A projection screen is used to display the image content projected by the projection lens; the image content includes a scene selection interface; the scene selection interface includes selection controls.

[0017] The image processing unit is also configured to determine the current scene in response to a touch operation on the selection control.

[0018] In some embodiments of this application, the image processing unit is further configured to identify the user's refresh action on the display interface of the projection screen and determine the current scene based on the identification result.

[0019] In some embodiments of this application, the image processing unit is further configured to obtain the refresh rate of the image signal and determine the current scene based on the refresh rate.

[0020] In some embodiments of this application, the image processing unit is further configured to generate a third signal based on the image signal through the low-latency channel in the image processing unit if the current scene is a low-latency scene; the third signal is used to characterize the image content of the image signal; the signal processing time of the low-latency channel is less than the signal processing time of the high-contrast channel;

[0021] The display driver control unit is also configured to generate a second amplitude modulation drive signal based on the third signal;

[0022] The imaging display unit is also used to perform imaging display based on the second amplitude modulation drive signal.

[0023] In some embodiments of this application, the display driver control unit is further configured to generate a primary color synchronization signal; the primary color synchronization signal is used to characterize the lighting sequence of multiple primary color lasers;

[0024] The imaging display unit includes:

[0025] A laser for emitting a laser beam according to the primary color synchronization signal;

[0026] A phase-modulated light device is used to set the laser beam to a phase-adjustment state in a high-contrast scene, and modulate the laser beam according to the phase-modulation drive signal to generate a phase-modulated laser beam.

[0027] A light valve is used to modulate the phase-modulated laser beam according to the first amplitude modulation drive signal to obtain a first image beam and output the first image beam to the projection lens.

[0028] A projection lens is used to project the first image beam into an image.

[0029] In some embodiments of this application, the phase light modulation device is further used to perform total internal reflection on the laser beam in a low-latency scenario, and output the total internally reflected laser beam to the light valve;

[0030] The light valve is also used to modulate the total internal reflection laser beam according to the second amplitude modulation drive signal in a low-latency scenario to obtain a second image beam and output the second image beam to the projection lens.

[0031] The projection lens is also used to project the second image beam into an image.

[0032] In some embodiments of this application, the display driver control unit includes:

[0033] A galvanometer, which is used to be turned on in high-contrast scenes and turned off in low-latency scenes.

[0034] The projection display device and method provided in this embodiment include a multimedia processing unit for receiving image signals from a signal source; an image processing unit connected to the multimedia processing unit, which determines the current scene. If the current scene is a high-contrast scene, it generates a first signal and a second signal that are synchronized with each other based on the image signal through a phase modulation channel in the image processing unit. The first signal is used to characterize the image content of the image frame of the image signal, and the second signal is used to characterize the 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 is used 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 is used to process the second signal to obtain a phase modulation driving signal; and an imaging display unit connected to the display driving control unit and the display image phase execution unit is used to perform imaging display based on the first amplitude modulation driving signal and the phase modulation driving signal. The projection display device provided in this embodiment, by setting the image processing unit to generate two synchronized signals using a phase modulation channel after determining that the current scene is a high-contrast scene, one signal is used for amplitude modulation and the other for phase modulation, thereby introducing phase modulation and improving the dynamic contrast of the projection display device. Attached Figure Description

[0035] To more clearly illustrate the implementation methods in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0036] Figure 1 This is a schematic diagram illustrating the operational scenario between the display device and the control unit according to the embodiment;

[0037] Figure 2 An exemplary block diagram of the configuration of the control device 100 according to an exemplary embodiment is shown;

[0038] Figure 3 An exemplary configuration block diagram of a display device 200 according to an exemplary embodiment is shown;

[0039] Figure 4 A flowchart illustrating a projection display method provided in this application. Figure 1 ;

[0040] Figure 5a A schematic diagram of the image signal system of a projection display device provided in this application;

[0041] Figure 5bA schematic diagram of the structure of a multimedia processing unit in the image signal system of a projection display device provided in this application;

[0042] Figure 5c A schematic diagram of the structure of an image processing unit in an image signal system of a projection display device provided in this application;

[0043] Figure 5d A schematic diagram of the structure of a display drive control unit in the image signal system of a projection display device provided in this application;

[0044] Figure 5e A schematic diagram of the structure of an image phase execution unit in the image signal system of a projection display device provided in this application;

[0045] Figure 5f A schematic diagram of the structure of an imaging display unit in the image signal system of a projection display device provided in this application;

[0046] Figure 6 A flowchart illustrating a projection display method provided in this application. Figure 2 ;

[0047] Figure 7 A schematic diagram illustrating the refresh process of each primary color component of an image pixel in a projection display method provided in this application;

[0048] Figure 8 A schematic diagram of the time delay of each processing unit in the image signal system of a projection display device provided in this application;

[0049] Figure 9 A flowchart illustrating a projection display method provided in this application. Figure 3 . Detailed Implementation

[0050] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0051] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0052] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0053] The display device provided in this application can have various implementation forms, such as a television, a smart television, a laser projection display device, a monitor, an electronic bulletin board, an electronic table, etc. Figure 1 and Figure 2 This is one specific embodiment of the display device of this application.

[0054] Figure 1 This is a schematic diagram illustrating the operational scenario between the display device and the control unit according to the embodiment. Figure 1 As shown, the user can operate the display device 200 through the smart device 300 or the control device 100.

[0055] In some embodiments, the control device 100 may be a remote control. Communication between the remote control and the display device includes infrared protocol communication, Bluetooth protocol communication, and other short-range communication methods, controlling the display device 200 wirelessly or via wired means. Users can control the display device 200 by inputting user commands through buttons on the remote control, voice input, control panel input, etc.

[0056] In some embodiments, a smart device 300 (such as a mobile terminal, tablet computer, computer, laptop computer, etc.) may also be used to control the display device 200. For example, an application running on the smart device may be used to control the display device 200.

[0057] In some embodiments, the display device may receive instructions not through the aforementioned smart devices or control devices, but through touch or gestures.

[0058] In some embodiments, the display device 200 can also be controlled in ways other than the control device 100 and the smart device 300. For example, it can be controlled by directly receiving the user's voice commands through a module configured inside the display device 200 for acquiring voice commands, or it can be controlled by receiving the user's voice commands through a voice control device set outside the display device 200.

[0059] In some embodiments, the display device 200 also communicates with the server 400. The display device 200 may communicate via a local area network (LAN), wireless local area network (WLAN), and other networks. The server 400 may provide various content and interactive features to the display device 200. The server 400 may be a cluster or multiple clusters, and may include one or more types of servers.

[0060] Figure 2 An exemplary block diagram of the configuration of the control device 100 according to an exemplary embodiment is shown. Figure 2 As shown, the control device 100 includes a controller 110, a communication interface 130, a user input / output interface 140, a memory, and a power supply. The control device 100 can receive user input operation commands and convert the operation commands into commands that the display device 200 can recognize and respond to, thus acting as an intermediary for interaction between the user and the display device 200.

[0061] like Figure 3 The display device 200 includes at least one of the following: a tuner 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and a user interface.

[0062] In some embodiments, the controller includes a processor, a video processor, an audio processor, a graphics processor, RAM, ROM, and a first interface to an nth interface for input / output.

[0063] The display 260 includes a display screen assembly for presenting images, a driving assembly for driving image display, a component for receiving image signals from the controller output, and a user control UI interface for displaying video content, image content, menu control interface, and user control UI interface.

[0064] The display 260 can be an LCD display, an OLED display, or a projection display, and can also be a projection device and a projection screen.

[0065] The communicator 220 is a component used to communicate with external devices or servers according to various communication protocol types. For example, the communicator may include at least one of the following: a Wi-Fi module, a Bluetooth module, a wired Ethernet module, other network communication protocol chips or near-field communication protocol chips, and an infrared receiver. The display device 200 can establish the transmission and reception of control signals and data signals with the external control device 100 or the server 400 through the communicator 220.

[0066] The user interface can be used to receive control signals from the control device 100 (such as an infrared remote control).

[0067] Detector 230 is used to collect signals from the external environment or to interact with the external environment. For example, detector 230 includes a light receiver, a sensor for collecting ambient light intensity; or, detector 230 includes an image acquisition device, such as a camera, which can be used to collect external environmental scenes, user attributes, or user interaction gestures; or, detector 230 includes a sound acquisition device, such as a microphone, for receiving external sounds.

[0068] The external device interface 240 may include, but is not limited to, one or more of the following: High Definition Multimedia Interface (HDMI), analog or high-definition component input interface (component), composite video input interface (CVBS), USB input interface (USB), RGB port, etc. It may also be a composite input / output interface formed by multiple interfaces mentioned above.

[0069] The tuner / demodulator 210 receives broadcast television signals via wired or wireless means, and demodulates audio and video signals, such as EPG data signals, from multiple wireless or wired broadcast television signals.

[0070] In some embodiments, the controller 250 and the tuner 210 may be located in different separate devices, that is, the tuner 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.

[0071] The controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in the memory. The controller 250 controls the overall operation of the display device 200. For example, in response to receiving a user command to select a UI object to display on the monitor 260, the controller 250 can execute operations related to the object selected by the user command.

[0072] In some embodiments, the controller includes at least one of a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), RAM (random access memory), ROM (read-only memory), a first to an nth interface for input / output, a communication bus, etc.

[0073] Users can input commands through a graphical user interface (GUI) displayed on the monitor 260, and the user input interface receives the user input commands through the GUI. Alternatively, users can input commands by entering specific sounds or gestures, and the user input interface receives the user input commands by recognizing the sounds or gestures through sensors.

[0074] A "user interface" is the medium through which an application or operating system interacts and exchanges information with the user. It converts information from its internal form to a form that the user can accept. A common form of user interface is the graphical user interface (GUI), which refers to a user interface related to computer operation displayed graphically. It can be an icon, window, control, or other interface element displayed on the screen of an electronic device. Controls can include visual interface elements such as icons, buttons, menus, tabs, text boxes, dialog boxes, status bars, navigation bars, and widgets.

[0075] Currently, judging from the product technology development trend of display devices, users have increasingly higher requirements for the brightness, contrast, clarity, and color of display devices.

[0076] Among related technologies, Mini LED TVs can utilize high-density backlight zoning technology and high light source brightness to provide precise light control and high contrast. OLED TVs, due to the self-emissive nature of their pixels, can achieve near-infinite contrast. However, neither of the above methods is suitable for projection display devices. Therefore, how to improve the contrast of projection display devices is a pressing technical problem that needs to be solved.

[0077] To address the aforementioned technical problems, the inventors of this application have discovered that for laser projection display devices, a phase light modulation (PLM) system (which may include an image algorithm unit, a phase dimming drive control unit, and a phase dimming display unit, etc.) can be added. By modulating the phase of the laser surface light source, the diffraction of light is used to direct more light to bright areas and less light to dark areas, thereby achieving local dimming and ultimately improving the dynamic contrast of the laser display product image. Based on this, the inventors of this application have discovered that adding a PLM phase dimming system may cause image display stuttering. To solve this technical problem, the inventors of this application have further discovered that adding a PLM phase dimming system increases the video signal processing time and video signal delay in order to synchronously output signals representing image content and signals representing the brightness of each zone of the phase map. Therefore, different display strategies can be adopted for different scenarios. Specifically, PLM phase dimming technology can be introduced only when the current scenario is determined to be a high-contrast scenario to avoid increasing the delay time in other scenarios. Based on this, this application provides a projection display device and method.

[0078] The following example, using the controller of a projection display device as the execution entity, illustrates how a projection display device can adopt different projection display strategies for different scenarios.

[0079] The technical solutions of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0080] Figure 4 A flowchart illustrating a projection display method provided in this application. Figure 1 .like Figure 4 As shown, the method includes the following steps:

[0081] 401. Receive the image signal from the signal source.

[0082] Specifically, a projection display device can receive image signals from multiple signal sources. Image signals can include video or images.

[0083] In some embodiments, such as Figure 5a As shown, the projection display device may include an image signal system 50, which may include a multimedia processing unit 501. The multimedia processing unit 501 receives video signals from multiple signal sources.

[0084] For example, such as Figure 5b As shown, the multimedia processing unit 501 may 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.

[0085] The signal source switching switch 5011 is used to detect HDMI signal sources, analog / digital TV channel signal sources, USB channel signal sources, network video application signal sources, etc., and switch to the corresponding input signal source channel.

[0086] The single / multi-channel video processing subunit 5015 is used to select between single-channel and multi-channel video processing based on different APP applications when switching to a network video application signal source. For example, APP applications such as "fitness", "video call", and "search" can perform multi-channel video processing.

[0087] The signal detection subunit 5012 is used to perform timing detection, color gamut conversion, and HDR processing on the signal input to the subunit. Specifically, it performs timing detection on the input signal, detects and converts the resolution and frame rate of the input signal, processes the brightness and contrast of the input signal, and performs color gamut conversion between different color spaces.

[0088] The signal resolution scaling subunit 5013 is used to reduce or increase the resolution of the signal input to the subunit. For example, assuming the resolution of the signal input to the subunit is 1920x1080 and the resolution output to the display screen is 3840x2160, the resolution of the signal can be increased by the subunit, turning 1 pixel into 4 pixels.

[0089] The signal format conversion subunit 5014 is used to convert the format of the signal input to the subunit and output the timing signal required for the back-end display.

[0090] 402. Determine the current scene. If the current scene is a high-contrast scene, generate a first signal and a second signal that are synchronized with each other based on the image signal. The first signal is used to characterize the image content of the image signal, and the second signal is used to characterize the brightness of at least one partition in the image frame of the image signal.

[0091] Specifically, to meet different user needs, scenarios can be divided into several categories, such as high-contrast scenarios and low-latency scenarios. In high-contrast scenarios, users have a higher demand for contrast than for latency; therefore, PLM phase light modulation can be introduced to achieve high contrast.

[0092] For example, such as Figure 5a As shown, the image signal system 50 also includes an image processing unit 502. After receiving the image signal from the signal source through the multimedia unit 501, the image processing unit 502 can determine the current scene. If it is a high-contrast scene with high contrast requirements, a PLM phase light modulation system can be introduced. Specifically, the image processing unit 502 can include multiple channels, each corresponding to a different scene, and performs different processing on the image signal under different scenes. For example, when the current scene is a high-contrast scene, the image signal can be processed through the phase modulation channel in the image processing unit 502; when the current scene is a low-latency scene, the image signal can be processed through the low-latency channel in the image processing unit 502.

[0093] In some embodiments, the phase modulation channel may include: a phase map processing subunit connected to the multimedia processing unit, configured to divide the image frame to be displayed of the image signal into multiple partitions, determine the brightness of the multiple partitions according to the statistical characteristics of the images corresponding to the multiple partitions, and obtain a phase map corresponding to the image frame to be displayed of the image signal.

[0094] In some embodiments, the phase modulation channel may further include: a resolution scaling subunit connected to the phase map processing subunit, used to adjust the resolution of the phase map corresponding to the image frame to be displayed 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.

[0095] For example, such as Figure 5c As shown, the image processing unit 502 may 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.

[0096] The VB1 signal input subunit 5021 is used to receive the VB1 (V byone) format image signal input from the multimedia processing unit 501.

[0097] The phase image processing subunit 5022 is used to perform calculations, analysis, and processing on the input VB1 format image signal. The image signal includes multiple image frames to be displayed. For each of these multiple image frames to be displayed, the algorithm component of the phase processing subunit 5022 can divide the image frame to be displayed into several partitions (wherein, the number of partitions is related to the processing capability of the phase light modulation device in the subsequent imaging display unit; for example, the number of partitions is less than or equal to the resolution of the phase light modulation device). Based on the statistical characteristics of the images of each partition, the brightness of each partition is analyzed and calculated so that the grayscale of the original input image can be dynamically adjusted in real time according to the contrast enhancement algorithm, so that the brightness of the bright parts in the image can be maximized, and the brightness of the dark parts can be reduced or even turned off. In some embodiments, the PLM light adjustment algorithm processes the entire frame, and the R, G, and B primary color pixel channels are processed separately.

[0098] The resolution scaling subunit 5023 is used to reduce or increase the resolution of the image signal output by the phase map processing subunit 5022, and finally outputs one VB1 image signal to the display driver control unit and one DP (Displayport) image signal to the display image phase execution unit. The two image signals are required to be output synchronously. For example, the two image signals can be output based on the same target clock source to achieve the effect of synchronous output.

[0099] In some embodiments, there are multiple ways to determine the current scenario.

[0100] In one possible implementation, a user interface (UI) can be provided to receive user selections and determine the current scene based on those selections. Specifically, the projection display device may also include:

[0101] A projection screen is used to display the image content projected by the projection lens; the image content includes a scene selection interface; the scene selection interface includes selection controls.

[0102] The image processing unit is also configured to determine the current scene in response to a touch operation on the selection control.

[0103] In another possible implementation, considering that users frequently refresh the screen when they perceive image lag, the user's refresh actions can be identified, and the current scene can be determined based on the identification results. Specifically, the image processing unit is also used to identify the user's refresh actions on the display interface of the projection screen and determine the current scene based on the identification results.

[0104] Specifically, it can identify the frequency of refresh actions. If the frequency is greater than the preset frequency, it indicates that the user believes the current display is lagging. If the current scene is a high-contrast scene, it is necessary to exit the scene and switch to another scene, such as a low-latency scene.

[0105] In another possible implementation, different scenes can be distinguished based on the 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 based on the refresh rate.

[0106] Specifically, the refresh rate of the input image signal can be read from the screen parameters using a decoding tool. If the refresh rate is greater than a preset value, it indicates that the image signal is a video signal for a game, requiring low latency, thus determining that the current scene is a low-latency scene. If the refresh rate is less than the preset value, it indicates that the image signal is a video signal for watching movies, requiring high contrast but not high latency, thus determining that the current scene is a high-contrast scene.

[0107] It should be noted that the high contrast in high contrast scenes refers to the contrast relative to the contrast without PLM phase light modulation. Using PLM will improve the contrast. The low latency in low latency scenes refers to the latency relative to the latency with PLM phase light modulation. Not using PLM can save the time spent on signal buffering to achieve synchronization, so the latency will be reduced without using PLM.

[0108] 403. Process the first signal to obtain the first amplitude modulation drive signal.

[0109] Specifically, the first amplitude modulation drive signal is used to adjust the intensity of the laser beam. For example, it can control a Digital Micromirror Device (DMD) to achieve amplitude modulation. The DMD chip consists of a large number of tiny mirrors, each representing a pixel. The first amplitude modulation drive signal controls the mirrors to flip at corresponding angles, thereby controlling the intensity and color of the light, achieving amplitude modulation, and thus forming an image on the screen.

[0110] In some embodiments, such as Figure 5a As shown, the image signal system 50 may further include: a display drive control unit 503, connected to the image processing unit 502, for processing the first signal to obtain a first amplitude modulation drive signal.

[0111] For example, such as Figure 5d As shown, the display driver control unit 503 includes a memory and a program storage control subunit 5030, which is the control center for program storage, data processing, and output instructions of the Digital Light Processing (DLP) display unit.

[0112] The display driver control unit 503 includes an input signal interface 5031 for receiving VB1 video signals and UI data output by the image processing unit 502.

[0113] The display driver control unit 503 includes a signal format conversion subunit 5032, which is used to perform timing detection on the signal output from the input signal interface 5031 and to detect the resolution and frame rate of the signal.

[0114] The display driver control unit 503 includes a video processing subunit 5033, which processes the brightness, contrast, color, and sharpness of the signal output by the signal format conversion subunit 5032.

[0115] The display driver control unit 503 includes a frame rate format conversion subunit 5034, which processes the resolution and frame rate of the signal output by the video processing subunit 5033 and outputs the corresponding frame rate and resolution. It is also used to buffer the video signal input by the multimedia unit 501 and refresh the pixel colors.

[0116] The display drive control unit 503 includes a geometric correction subunit 5035, which performs image correction on the signal output by the frame rate format conversion subunit 5034 according to the input correction parameters, and finally corrects it into a rectangle.

[0117] The display driver control unit 503 includes a galvanometer drive signal generator 5036, an operational amplifier 50361, and a galvanometer 50362, which are used to perform image processing methods such as pixel expansion and pixel array reconstruction on the signal output by the geometric correction subunit 5035 to improve the display resolution.

[0118] The display drive control unit 503 includes: an image quality processing subunit 5037, which performs primary color correction, color mixing correction, white balance processing, etc. on the signal output by the galvanometer drive signal generator 5036.

[0119] The display driver control unit 503 includes a DLP format conversion subunit 5038, which receives the signal output by the image quality processing subunit 5037, encodes the video format of the signal, and converts it into a signal that conforms to the format of DMD display.

[0120] The display driver control unit 503 includes a DMD data interface module and a control interface 5039. The DMD data interface module is used to transmit input signals conforming to the DMD display format according to the HSSI high-speed signal transmission protocol. The DMD control interface is used to output commands to control the DMD to perform specific functions.

[0121] 404. Process the second signal to obtain a phase modulation drive signal.

[0122] Specifically, the phase modulation drive signal includes the brightness of each zone. The phase light modulation device can adjust the grayscale of the original input image according to the phase modulation drive signal, so that the brightness of the bright parts in the image can be maximized, and the brightness of the dark parts can be reduced or even turned off.

[0123] In some embodiments, such as Figure 5a As shown, the image signal system 50 may include a display image phase execution unit 504, which is connected to the image processing unit 502, for processing the second signal to obtain a phase modulation drive signal.

[0124] For example, such as Figure 5e As shown, the image display phase execution unit 504 includes a PLM bias voltage conversion unit 5041, which provides bias voltage to the phase modulation device and the phase dimming drive system 5402 in the imaging display unit.

[0125] The display image phase execution unit 504 includes a phase dimming drive system 5042 for driving a second signal to obtain a phase modulation drive signal.

[0126] 405. Perform imaging display based on the first amplitude modulation drive signal and the phase modulation drive signal.

[0127] Specifically, after obtaining the first amplitude modulation drive signal and the phase modulation drive signal, the laser beam can be phase-modulated based on the phase modulation drive signal to improve dynamic contrast, and the intensity of the laser beam can be modulated based on the amplitude modulation drive signal to display image content.

[0128] In some embodiments, such as Figure 5a As shown, the image signal system 50 may include an imaging display unit 505, which is connected to the display drive control unit 503 and the display image phase execution unit 504, and is used to perform imaging display according to the first amplitude modulation drive signal and the phase modulation drive signal.

[0129] Specifically, the imaging display unit 505 receives the first amplitude adjustment drive signal (timing display video signal (VB1 signal)) output by the display drive control unit 503, and simultaneously receives the phase modulation drive signal output by the display image phase execution unit 504, thereby realizing local backlight control according to the light source lighting sequence, outputting backlight with phase modulation of each primary color (backlight partition signal, the resolution of the backlight partition signal is less than the resolution of the VB1 signal), and finally realizing the simultaneous display of image content and backlight partition.

[0130] In some embodiments, the display driver control unit is further configured to generate a primary color synchronization signal; the primary color synchronization signal is used to characterize the lighting sequence of multiple primary color lasers.

[0131] In some embodiments, such as Figure 5f As shown, the imaging display unit 505 includes a laser 5052 for emitting a laser beam according to the primary color synchronization signal.

[0132] Specifically, the laser can be a tri-color laser, which can output tri-color lasers that are lit in a sequential manner.

[0133] In some embodiments, the imaging display unit 505 includes a phase light modulation device 5053, which is configured to be in a phase adjustment state in a high contrast scene, and to modulate the laser beam according to the phase modulation driving signal to generate a phase-modulated laser beam.

[0134] Specifically, the phase light modulator 5053 outputs backlight with phase modulation of each primary color according to the lighting sequence of the light source.

[0135] In some embodiments, the imaging display unit 505 includes: a light valve 5054, used to modulate the phase-modulated laser beam according to the first amplitude modulation driving signal to obtain a first image beam, and output the first image beam to the projection lens.

[0136] Specifically, the light valve 5054 can be a DMD chip used for timing display of video signals, combined with phase dimming to achieve local backlight control.

[0137] In some embodiments, the imaging display unit 505 includes a projection lens 5055 for projecting the first image beam into an image.

[0138] 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 cycle signals according to the primary color synchronization signal, so as to sequentially illuminate the laser. PWM represents the luminance value of each primary color signal, and the duty cycle signal represents the weight percentage of each primary color signal in a complete color cycle signal.

[0139] In some embodiments, the image pixel color refresh method involves decomposing an image frame into RGB components, referred to as a 1RGB frame. During the refresh process, each component is sequentially enabled according to the control image pixel enable signals (R_EN, G_EN, B_EN), and each component is refreshed in a time sequence. For example... Figure 7 As shown, the R component can be enabled first, followed by the G component after the R component refresh is complete, and then the B component after the G component refresh is complete. The refresh of the image frame is then complete after the B component refresh is finished.

[0140] As can be seen from the above description, the projection display method provided in this application embodiment, by setting up an image processing unit, after determining that the current scene is a high contrast scene, uses a phase modulation channel to generate two mutually synchronized signals, one signal for amplitude modulation and the other signal for phase modulation, thereby introducing phase modulation and improving the dynamic contrast of the projection display device.

[0141] In some embodiments, the image signal system can process image signals of different formats. For image signals of different formats, the signal format output by each processing unit can be referred to Table 1 below.

[0142] Table 1

[0143]

[0144] As shown in Table 1, when the video signal format output by the multimedia unit is 3840 x 2160 @ 60Hz, assuming the current scene is determined to be a high-contrast scene, the image processing unit outputs one VB1 video signal (first signal) of 3840 x 2160 @ 60Hz and one DP (Display port) 2560 x 1600 @ 60Hz video signal (second signal). However, when the video signal format output by the multimedia unit is 1920 x 1080 @ 120Hz or 1920 x 1080 @ 240Hz, assuming the current scene is determined to be a low-latency scene, the image processing unit only outputs one 1920 x 1080 @ 120Hz (third signal) or one 1920 x 1080 @ 240Hz video signal (third signal).

[0145] Figure 6 A flowchart illustrating a projection display method provided in this application. Figure 2 .like Figure 6 As shown, based on the above embodiments, for example in Figure 4 Based on the illustrated embodiment, a processing procedure for low-latency scenarios has been added. This method includes the following steps:

[0146] 601. Receive the image signal from the signal source.

[0147] 602. Determine the current scene. If the current scene is a high-contrast scene, proceed to step 603. If the current scene is a low-latency scene, proceed to step 607.

[0148] 603. Generate a first signal and a second signal that are synchronized with each other based on the image signal; the first signal is used to characterize the image content of the image signal, and the second signal is used to characterize the brightness of at least one partition in the image frame of the image signal.

[0149] 604. Process the first signal to obtain the first amplitude modulation drive signal.

[0150] 605. Process the second signal to obtain a phase modulation drive signal.

[0151] 606. Perform imaging display based on the first amplitude modulation drive signal and the phase modulation drive signal.

[0152] 607. A third signal is generated based on the image signal through the low-latency channel in the image processing unit; the third signal is used to characterize the image content of the image signal; the signal processing time of the low-latency channel is less than the signal processing time of the high-contrast channel.

[0153] 608. Generate a second amplitude modulation drive signal based on the third signal.

[0154] 600. Imaging display is performed according to the second amplitude modulation drive signal.

[0155] Specifically, such as Figure 5c As shown, the image processing unit 502 also includes a low-latency channel, which may include VB1 signal output subunit 5026 and VB1 signal output subunit 5027. It does not include time-consuming processing units such as the phase map processing subunit 5022 and the resolution scaling subunit 5023 in the phase modulation channel. Therefore, generating the third signal through the low-latency channel can meet the low-latency requirement.

[0156] In some embodiments, the phase light modulation device is further configured to perform total internal reflection of the laser beam in a low-latency scenario, and output the total internally reflected laser beam to the optical valve.

[0157] The light valve is also used to modulate the total internal reflection laser beam according to the second amplitude modulation drive signal in a low-latency scenario to obtain a second image beam, and output the second image beam to the projection lens.

[0158] The projection lens is also used to project the second image beam into an image.

[0159] In some embodiments, the display driver control unit includes:

[0160] A galvanometer is configured to be turned on in high-contrast scenarios to perform pixel expansion on the first signal, and to be turned off in low-latency scenarios.

[0161] The following combination Figure 8 The time delay in the processing of each unit in the image signal system is analyzed. For example... Figure 8 As shown, the processing time of the image signal by the multimedia unit is t1, the processing time of the image signal by the image processing unit is t2, and the processing time of the image signal by the display driver control unit is t3. The total image processing latency Ttotal = t1 + t2 + t3. Because the resolution of the signal source content input to the multimedia unit varies, the processing methods of each unit differ, resulting in different t1, t2, and t3. To match the optimal image processing method for each signal source content, different scenes can be determined for different input signal source content, and then different display strategies can be adopted for different scenes. For example, scenes can be divided into high-contrast scenes (e.g., when watching a movie) and low-latency scenes (e.g., when playing a game).

[0162] The following combination Figure 9Examples illustrating different display strategies for different scenarios are provided. These scenarios include low-latency gaming and high-contrast movie watching. Figure 9 As shown, in low-latency scenarios, the image processing unit does not output a DP signal, meaning no phase modulation signal is input to the imaging display unit, and the phase modulation device in the imaging display unit is set to total internal reflection. During imaging and display, the laser beam is amplitude-modulated solely based on the third signal output by the image processing unit to achieve imaging and display. Furthermore, to further reduce latency, the galvanometer in the display drive control unit is turned off. In high-contrast scenarios, the image processing unit outputs a DP signal, i.e., the second signal. During imaging and display, the phase modulation device in the imaging display unit is set to phase adjustment mode, improving the dynamic contrast of the display by phase modulation of the laser beam. Correspondingly, since the requirement for low latency is not significant, the galvanometer can be set to the on state for better display effects.

[0163] It is evident that the processing time (t2) for the video image by the image processing unit and the processing time (t3) for the video image by the display driver system unit differ when inputting game image content and video image content. When inputting video image content, the image processing unit typically performs buffering to ensure synchronization of the output VB1 and DP signals, thus ensuring synchronization of the two output video signals. Therefore, the time required for the video image (t2) is greater than the time required for the game content (t2). When processing game content, the display driver system unit disables the galvanometer, reduces the resolution, and increases the frame rate to minimize the latency (t3). However, when processing video image content, the display driver system unit maintains a high resolution of 3840×2160@60Hz, with the galvanometer on. This requires processing the input 1 frame of 60Hz image into four 240Hz sub-frames, increasing the latency (t3).

[0164] In summary, by employing different image processing methods for different signal sources, high dynamic contrast and high resolution are maintained when viewing video images in high-contrast scenes, improving the display effect, but this also results in maximum image latency. For low-latency scenes, image latency caused by caching is reduced when inputting game content, minimizing latency and improving the smoothness of the gaming experience.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0166] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A projection display device, characterized in that, The projection display device includes: A multimedia processing unit is used to receive image signals from a signal source; An image processing unit, connected to the multimedia processing unit, is used to determine the current scene. If the current scene is a high-contrast scene, the image processing unit generates a first signal and a second signal that are synchronized with each other based on the image signal through the phase modulation channel in the image processing unit. The first signal is used to characterize the image content of the image frame of the image signal, and the second signal is used to characterize the brightness of at least one partition in the image frame of the image signal. The display driving control unit is connected to the image processing unit and is used to process the first signal to obtain the first amplitude modulation driving signal. The display image phase execution unit is connected to the image processing unit and is used to process the second signal to obtain a phase modulation drive signal; An imaging display unit, connected to the display driving control unit and the display image phase execution unit, is used to perform imaging display based on the first amplitude modulation driving signal and the phase modulation driving signal.

2. The display device according to claim 1, characterized in that, The phase modulation channel includes: The phase map processing subunit, connected to the multimedia processing unit, is used to divide the image frame to be displayed of the image signal into multiple partitions, determine the brightness of the multiple partitions according to the statistical characteristics of the images corresponding to the multiple partitions, and obtain the phase map corresponding to the image frame to be displayed of the image signal.

3. The display device according to claim 2, characterized in that, The phase modulation channel further includes: The resolution scaling subunit, connected to the phase map processing subunit, is used to adjust the resolution of the phase map corresponding to the image frame to be displayed of the image signal, obtain a first signal and a second signal, and output the first signal and the second signal synchronously based on the target clock signal.

4. The display device according to claim 1, characterized in that, The projection display device also includes: A projection screen is used to display image content projected by a projection lens; the image content includes a scene selection interface; the scene selection interface includes selection controls. The image processing unit is also configured to determine the current scene in response to a touch operation on the selection control.

5. The display device according to claim 4, characterized in that, The image processing unit is also used to identify the user's refresh action on the display interface of the projection screen, and to determine the current scene based on the identification result.

6. The display device according to claim 1, characterized in that, The image processing unit is also used to obtain the refresh rate of the image signal and determine the current scene based on the refresh rate.

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

8. The display device according to claim 7, characterized in that, The display driver control unit is also used to generate a primary color synchronization signal; the primary color synchronization signal is used to characterize the lighting sequence of multiple primary color lasers; The imaging display unit includes: A laser for emitting a laser beam according to the primary color synchronization signal; A phase-modulated light device is used to set the laser beam to a phase-adjustment state in a high-contrast scene, and modulate the laser beam according to the phase-modulation drive signal to generate a phase-modulated laser beam. A light valve is used to modulate the phase-modulated laser beam according to the first amplitude modulation drive signal to obtain a first image beam and output the first image beam to the projection lens. A projection lens is used to project the first image beam into an image.

9. The display device according to claim 8, characterized in that, The phase light modulation device is also used to perform total internal reflection of the laser beam in a low-latency scenario, and output the total internally reflected laser beam to the optical valve; The light valve is also used to modulate the total internal reflection laser beam according to the second amplitude modulation drive signal in a low-latency scenario to obtain a second image beam and output the second image beam to the projection lens. The projection lens is also used to project the second image beam into an image.

10. The display device according to claim 7, characterized in that, The display driver control unit includes: A galvanometer is configured to be turned on in high-contrast scenarios to perform pixel expansion on the first signal, and to be turned off in low-latency scenarios.

11. A projection display method, characterized in that, include: Receive image signals from the signal source; The current scene is determined. If the current scene is a high-contrast scene, a first signal and a second signal that are synchronized with each other are generated based on the image signal. The first signal is used to characterize the image content of the image frame of the image signal, and the second signal is used to characterize the brightness of at least one partition in the image frame of the image signal. The first signal is processed to obtain a first amplitude modulation drive signal; The second signal is processed to obtain a phase modulation drive signal; Imaging and display are performed based on the first amplitude modulation drive signal and the phase modulation drive signal.

Images