Field sequential LCD projection method, system, storage medium and electronic device

Abstract

Embodiments of the present application provide a field sequential LCD projection method, system, storage medium and electronic device, wherein the method comprises: in a display process of a frame of to-be-displayed image, controlling an LCD display screen to perform a line scanning operation according to a line-by-line scanning signal, controlling a light valve modulator to perform a partition scanning operation through a partition scanning signal according to a line scanning position of the LCD display screen, and controlling a backlight source to perform a color switching operation through a color control signal, so that a pixel row corresponding to the line scanning position on the LCD display screen displays a color corresponding to each monochrome image in a group of monochrome images. Through the present application, the technical problem that in the related art, it is impossible to reduce the cost while reducing the display color is solved, through the partition control of the light valve modulator, the accurate matching of the backlight source and the display content of the LCD display screen is realized, the color crosstalk phenomenon is reduced, and the display quality is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a field-sequence LCD projection method, system, storage medium, and electronic device. Background Technology

[0002] For conventional field sequence displays, refer to Figure 1 As shown, its principle is mainly to divide the display image period of one frame into three sub-frames: RGB. Each RGB sub-frame consists of the LCD's data loading time, liquid crystal response time, and RGB illumination time. In the principle of sequential display, the images of adjacent subfields are the RGB components of the same image, with significant color differences. Therefore, in the display of any sub-frame, all information from the previous sub-frame must be cleared to avoid affecting the color gamut of the image, which can even cause color deviation or color bleeding. For current LCD active matrix driving technology, LCDs are driven by progressive scanning, meaning that the gate signal lines are turned on row by row. Each time a row is turned on, all column data signal lines transmit data signals to the pixels in that row. For example... Figure 2 As shown, if this progressive scanning method is used in accordance with the conventional field sequence display scheme, the LCD only refreshes the RGB image three times consecutively within one frame. When the LEDs are already on in the next subframe, the other half of the LCD screen still retains the data signal from the previous subframe. This results in color crosstalk between adjacent subframes, causing a deviation in the superimposed colors (e.g., ...). Figure 3 (As shown).

[0003] Therefore, in order to minimize color crosstalk between adjacent subframes, related technologies may cause color discrepancies in the superimposed colors. (Reference) Figure 4 As shown, the relevant technology refreshes at least twice in each subframe, turning off the light source when the data is first refreshed across the entire screen (i.e., inserting a black frame), and then turning it on again when the signal is retained for the second refresh after the image is ready, in order to avoid color mixing caused by data corruption. However, this method requires the LCD refresh rate to be above 360Hz, and the liquid crystal response time (Ton + Toff) must be less than the time of one frame (i.e., 1 / 360 = 2.78ms). This method undoubtedly poses a significant challenge to the IC bandwidth and the liquid crystal response time (the refresh rate of a conventional LCD display IC is 60Hz, and the liquid crystal response time is around 20ms), leading to increased costs. Summary of the Invention

[0004] This application provides a field-sequence LCD projection method, system, storage medium, and electronic device to at least solve the technical problem in the related art of being unable to simultaneously reduce costs while reducing the number of colors displayed.

[0005] According to one aspect of the embodiments of this application, a field-sequence LCD projection method is provided, applied to a projection system. The projection system includes an LCD display screen, a light valve modulator, and a backlight, wherein the light valve modulator is superimposed after the LCD display screen and located between the LCD display screen and the backlight. The method includes:

[0006] When an image to be displayed exists, it is decomposed into a set of monochrome images, wherein the set of monochrome images includes a monochrome image of each image channel in a set of image channels; a set of control signals is determined based on the refresh rate of the LCD screen, the resolution of the LCD screen, and the resolution of the light valve modulator, wherein the set of control signals includes the progressive scan signal of the LCD screen, the partition scan signal of the light valve modulator, and the color control signal of the backlight; during the display of one frame of the image to be displayed, the LCD screen is controlled to perform a line scan operation according to the progressive scan signal, the light valve modulator is controlled to perform a partition scan operation through the partition scan signal according to the line scan position of the LCD screen, and the backlight is controlled to perform a color switching operation through the color control signal, so that the pixel row on the LCD screen corresponding to the line scan position displays the color corresponding to each monochrome image in the set of monochrome images.

[0007] According to another aspect of the embodiments of this application, a projection system is also provided, including an LCD display screen, a light valve modulator, a backlight, and a display controller, wherein the light valve modulator is superimposed on the LCD display screen and located between the LCD display screen and the backlight, wherein...

[0008] The display controller is used to decompose an image to be displayed into a set of monochrome images when an image to be displayed is present, wherein the set of monochrome images includes a monochrome image of each image channel in a set of image channels; determine a set of control signals based on the refresh rate of the LCD display, the resolution of the LCD display, and the resolution of the light valve modulator, wherein the set of control signals includes a progressive scan signal of the LCD display, a partition scan signal of the light valve modulator, and a color control signal of the backlight; during the display of one frame of the image to be displayed, the controller controls the LCD display to perform a line scan operation according to the progressive scan signal, controls the light valve modulator to perform a partition scan operation through the partition scan signal according to the line scan position of the LCD display, and controls the backlight to perform a color switching operation through the color control signal, so that the pixel row on the LCD display corresponding to the line scan position displays the color corresponding to each monochrome image in the set of monochrome images;

[0009] An LCD display screen is used to perform line scanning operations in response to the control of a display controller, based on line scanning signals.

[0010] A light valve modulator is used to respond to the control of the display controller and perform partition scanning operation according to the row scanning position of the LCD screen through partition scanning signals;

[0011] A backlight is used to respond to the control of the display controller and perform a color switching operation according to the color light control signal so that the pixel row corresponding to the row scan position on the LCD display displays the color corresponding to each monochrome image in a set of monochrome images.

[0012] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, wherein a computer program is stored in the computer program, and the computer program is configured to perform the steps in any of the above method embodiments when it is run.

[0013] According to another aspect of the embodiments of this application, a computer program product or computer program is provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, causing the computer device to perform the steps in any of the method embodiments described above.

[0014] According to another aspect of the embodiments of this application, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to perform the steps of any of the above method embodiments through the computer program.

[0015] This application establishes a light valve modulator between the LCD display and the backlight. Based on the LCD display's refresh rate, resolution, and the light valve modulator's resolution, a set of control signals is determined. During the display of one frame of an image, the LCD display is controlled to perform line scanning based on progressive scan signals. According to the line scanning position of the LCD display, the light valve modulator is controlled to perform partition scanning based on partition scan signals. Simultaneously, the backlight is controlled to perform color switching based on color control signals. This ensures that the pixel row corresponding to the line scanning position on the LCD display displays the color corresponding to each monochrome image in a set of monochrome images. This solves the technical problem in related technologies where it is impossible to simultaneously reduce the number of colors displayed and lower costs. Through the partition control of the light valve modulator, precise matching between the backlight and the content displayed on the LCD display is achieved, reducing color crosstalk and improving display quality. Furthermore, while reducing color crosstalk, compared to high refresh rate LCD projection display solutions, this application can use a relatively lower refresh rate, reducing the bandwidth requirements of the display controller IC. Moreover, it eliminates the need for high-bandwidth ICs and liquid crystal response times, allowing for setup under existing technology conditions, thus reducing costs to some extent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing a conventional field sequence in a related art according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the gate signal line startup sequence in a related art according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of color crosstalk between adjacent subframes in a related technology according to an embodiment of this application;

[0019] Figure 4 This is a schematic diagram showing a conventional field sequence in another related art according to an embodiment of this application;

[0020] Figure 5 This is a flowchart illustrating an optional field-sequence LCD projection method according to an embodiment of this application;

[0021] Figure 6 This is a structural diagram of an optional projection system according to an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of an optional field-sequence LCD projection display according to an embodiment of this application;

[0023] Figure 8 This is a schematic diagram of an optional second display timing according to an embodiment of this application;

[0024] Figure 9 This is a structural block diagram of an optional field-sequence LCD projection system according to an embodiment of this application;

[0025] Figure 10 This is a computer system architecture block diagram of an optional electronic device according to an embodiment of this application;

[0026] Explanation of reference numerals in the attached figures:

[0027] 61, PLENS; 62, Imaging Fresnel Lens; 63, LCD Display; 64, Light Valve Modulator; 65, Insulated Glass; 66, Illuminating Fresnel Lens; 67, Taper Rod; 68, Backlight. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] According to one aspect of the embodiments of this application, a field-sequence LCD projection method is provided. This field-sequence LCD projection method is applied to a projection system including an LCD display screen, a light valve modulator, and a backlight, wherein the light valve modulator is superimposed after the LCD display screen and located between the LCD display screen and the backlight. Figure 5 This is a flowchart illustrating an optional field-sequence LCD projection method according to an embodiment of this application, as shown below. Figure 5 As shown, the process of this method may include the following steps:

[0031] Step S502: If an image to be displayed exists, the image to be displayed is decomposed into a set of monochrome images, wherein the set of monochrome images includes a monochrome image of each image channel in a set of image channels.

[0032] The field-sequential LCD projection method in this embodiment can be applied to the projection field, including 3D displays, home theaters, educational projections, and office presentations. In these scenarios, when image projection is required, field-sequential LCD projection display technology is used. This technology involves displaying RGB three primary color images sequentially and then matching them with the illumination source color to achieve full-color display. However, this technology is prone to color crosstalk between adjacent subframes, causing color deviations in the superimposed images. Therefore, to minimize color crosstalk between adjacent subframes and prevent color deviations in the superimposed images, a method of refreshing at least twice in each subfield is employed. However, this method poses a significant challenge to the bandwidth of the IC and the response time of the liquid crystal, leading to increased costs. In other words, related technologies cannot reduce costs to a certain extent while simultaneously reducing color crosstalk.

[0033] To at least partially solve the aforementioned technical problems, in this embodiment, a light valve modulator is set between the LCD display and the backlight. A set of control signals is determined based on the refresh rate, resolution, and resolution of the LCD display and the light valve modulator. During the display of one frame of an image to be displayed, the LCD display is controlled to perform line scanning operations according to the progressive scan signal. Based on the line scanning position of the LCD display, the light valve modulator is controlled to perform partition scanning operations through partition scanning signals. The backlight is also controlled to perform color switching operations through color control signals, so that the pixel row on the LCD display corresponding to the line scanning position displays the color corresponding to each monochrome image in a set of monochrome images. This solves the technical problem in related technologies where it is impossible to simultaneously reduce the number of colors displayed while lowering costs.

[0034] In practice, the field-sequence LCD projection method in this embodiment can be applied to projection systems. Specifically, refer to... Figure 6 , Figure 6 This is a structural diagram of an optional projection system in an embodiment of this application. The projection system may include a PLENS (projection lens) 61, an imaging Fresnel lens 62, an LCD display screen 63, a light valve modulator 64, a heat-insulating glass 65, an illumination Fresnel lens 66, a Taper Rod (cone or light cone) 67, a backlight 68, and a display controller (not shown in the figure).

[0035] in,

[0036] The projection lens 61 is located at the top of the entire display system and is used to display magnified images on the LCD and project them onto a screen or projection screen to achieve image projection display.

[0037] The imaging Fresnel lens 62 is located on the front side of the LCD display 63. Its main function is to collect and focus the light emitted from the LCD display 63 so that the light can be better transmitted to the projection lens 61 and improve the projection effect.

[0038] LCD display screen 63 is used to display the image to be displayed.

[0039] The light valve modulator 64 plays a crucial role in dimming.

[0040] The heat-insulating glass 65, located below the light valve modulator 64, mainly serves to insulate the heat generated by the internal light source of the projection system.

[0041] The illumination Fresnel lens 66 is generally located between the backlight 68 and the LCD display 63, corresponding to the imaging Fresnel lens 62. The illumination Fresnel lens 66 is mainly responsible for uniformly illuminating the LCD display 63 with the light emitted from the backlight, ensuring that every part of the display panel receives uniform light.

[0042] Taper Rod 67, typically a tapered rod or light cone, is located below the heat-insulating glass 66 and is used to evenly distribute the light emitted from the backlight onto the LCD display screen 63.

[0043] Backlight 68 is used to emit light of the corresponding color.

[0044] The X and Y axes are used to define the positions of the light valve modulator and pixels on the LCD screen. The X-axis spans the width of the display panel, and the Y-axis can be the height of the display panel. The Z-axis represents the optical axis direction, that is, the direction in which light propagates, and is perpendicular to the surfaces of the LCD and the light valve modulator. The optical axis direction is the reference for the light transmission path in the projection display system.

[0045] It should be noted that the field-sequence LCD projection method can be a method of controlling color display through time sequence (field sequence), that is, displaying the three primary colors red (R), green (G), and blue (B) at different points in time, and combining these colors into a full-color image through the visual persistence effect of the human eye. An LCD screen, or liquid crystal display, is a display device based on liquid crystal materials. It controls the light transmittance of the liquid crystal cells by changing their electric field, thereby displaying images. A light valve modulator is an optical device that can control the amount of light passing through. It can be a dimmable light valve. In practice, light valve modulators can use LCD (Liquid Crystal Light) light valves, LCOS (Liquid Crystal On Silicon) light valves, or DLP (Digital Light Processor) light valves. Among them, the LCD light valve is an important optical device based on liquid crystal display technology. It has the characteristics of fast response speed, high contrast, and rich grayscale levels, and is widely used in large-screen projection displays, optical information processing, optical computing, and optical testing. The LCOS light valve is a display technology based on liquid crystal on silicon (Liquid Crystal On Silicon). Its principle is to use an LCOS panel to control light. The panel uses a CMOS chip as the circuit substrate and reflective layer. Liquid crystal is injected between the CMOS integrated circuit chip and the transparent glass substrate. Light passes through the glass substrate and the liquid crystal material, and after dimming, it is reflected from the chip surface to form an image. It has important applications in optical information processing, projection display, and other fields. DLP light valves use Digital Light Processor (DLP) technology, employing a DMD (Digital Micromirror Device) as the light valve imaging device. DLP technology achieves precise control of light and projection display by controlling the angle and on / off state of the micromirror, and has wide applications in projection display, virtual reality, and other fields.

[0046] The backlight is the light source used in a projection system to provide the light required for the LCD screen to display images. It is typically a light source system composed of LEDs, lasers, or halogen lamps. The image to be displayed can be a full-color image or a monochrome image. The image data corresponding to the image to be displayed is usually represented in the RGB color model or other color spaces, with each pixel containing information for the red, green, and blue color channels. A set of monochrome images refers to monochrome images separated from a full-color image, focusing on the R, G, and B channels. Each monochrome image contains information for only one color channel and is used for color display on the LCD screen. A set of image channels refers to the red (R), green (G), and blue (B) color channels, which correspond to the three primary colors in the RGB color model.

[0047] Specifically, in a projection system including a display controller, when the display controller detects the presence of an image to be displayed, it decomposes the image into a set of monochrome images. If the image data is not in direct RGB format, color space conversion is required to convert the image data to the RGB color space. This conversion is based on specific mathematical formulas or transformation matrices to ensure accurate color information conversion. If the image data is in RGB format, channel separation is performed, decomposing the RGB color value of each pixel to generate three monochrome image data. Each monochrome image retains only one color channel information (R, G, or B) from the original image, while setting the other two channels to zero or their minimum values, ensuring that each monochrome image corresponds to only one of the red, green, and blue components of the original image. In practice, the separated RGB three-channel image data may require further processing to adapt to the characteristics of the LCD display. This includes, but is not limited to, pixel data optimization, brightness adjustment, and contrast enhancement, ensuring that each monochrome image achieves optimal performance when displayed on the LCD.

[0048] Step S504: Based on the refresh rate of the LCD display, the resolution of the LCD display, and the resolution of the light valve modulator, a set of control signals is determined, wherein the set of control signals includes the progressive scan signal of the LCD display, the partition scan signal of the light valve modulator, and the color light control signal of the backlight.

[0049] Specifically, the refresh rate of an LCD screen refers to the number of times the LCD screen redraws an image per second. Resolution refers to the ability of a display device or optical device to distinguish the smallest detail, usually expressed in pixels, such as 1080P (1920x1080 pixels) or 4K (3840x2160 pixels).

[0050] A set of control signals may include progressive scan signals for the LCD display, zone scan signals for the light valve modulator, and color control signals for the backlight. The progressive scan signals are used to control the LCD display to refresh data line by line. In progressive scan mode, the LCD display refreshes the displayed data line by line from top to bottom until the entire LCD display is refreshed.

[0051] The partition scanning signal can be a signal that controls the light valve modulator to scan in a partitioned order. The partition scanning signal refers to the signal that the light valve modulator uses to control the backlight in partitioned manner.

[0052] Color control signals control the colors displayed by the backlight to ensure accurate color display. In field-sequence displays, color control signals are sent according to a predetermined timing sequence to synchronize with the scanning operation of the LCD screen and the light valve modulator.

[0053] For example, the display controller can determine the progressive scan signal of the LCD screen, the zone scan signal of the light valve modulator, and the color light control signal of the backlight based on the refresh rate of the LCD screen, the resolution of the LCD screen, and the resolution of the light valve modulator. Optionally, the refresh rate of the LCD screen and the refresh rate of the light valve modulator can be the same.

[0054] In step S506, during the display of a frame of image to be displayed, the LCD screen is controlled to perform a line scanning operation according to the line scanning signal. According to the line scanning position of the LCD screen, the light valve modulator is controlled to perform a partition scanning operation through the partition scanning signal, and the backlight is controlled to perform a color switching operation through the color light control signal, so that the pixel row corresponding to the line scanning position on the LCD screen displays the color corresponding to each monochrome image in a set of monochrome images.

[0055] The display process of a single frame of image to be displayed can include the display process of multiple subframes of monochrome images. Line scanning can be the process of writing data and updating the display of each row of pixels sequentially from top to bottom on the LCD. In field-sequence display, the line scanning operation is synchronized with the partition scanning of the light valve modulator and the color switching of the backlight.

[0056] Partition scanning operation refers to dividing the display area of ​​the light valve modulator into multiple independent control areas. Each control area can independently control the passage or blocking of light. Partition scanning operation is synchronized with the line scanning operation of the LCD screen so that when a certain row of pixels on the LCD screen is displaying a specific color, the corresponding partition of the light valve modulator will also modulate the corresponding light brightness.

[0057] Color switching operation refers to the backlight changing the color of the light according to the color control signal to match the monochrome image displayed on the LCD screen.

[0058] For example, during the process of controlling the display of one frame of the image to be displayed, the display controller controls the LCD screen to perform line scanning operation according to the line scanning signal through a set of control signals, controls the light valve modulator to perform partition scanning operation according to the line scanning position of the LCD screen, and controls the backlight to perform color switching operation through the color light control signal, so as to realize that the pixel row corresponding to the line scanning position on the LCD screen displays the color corresponding to each monochrome image in a set of monochrome images until one frame of image is displayed.

[0059] In one example, let's consider an LCD screen with a resolution of 1080P (i.e., 1920x1080 pixels) and a refresh rate of 240Hz. The display controller may include an image processing unit. This unit converts the image to be displayed into the RGB color space and then separates it into three monochrome images: an R-channel monochrome image, a G-channel monochrome image, and a B-channel monochrome image. Each monochrome image has the same resolution as the LCD screen (1920x1080 pixels) but only contains information for its corresponding color channel.

[0060] A set of control signals is generated based on the refresh rate and resolution of the LCD screen, as well as the resolution of the light valve modulator. This set of signals includes the progressive scan signal of the LCD screen, the zone scan signal of the light valve modulator, and the color light control signal of the backlight, ensuring that the corresponding operations are synchronized.

[0061] During the display process, when the LCD screen begins refreshing the displayed data from the first line, the light valve modulator's partition scanning signal controls the first line (or corresponding area) to be turned off, preventing the backlight from affecting the new colors to be displayed. As the LCD screen refreshes line by line downwards, the light valve modulator also scans downwards line by line (or partition), synchronously turning the backlight on and off in the corresponding areas. For example, when the LCD screen refreshes to the 5th line, the light valve modulator may have already completed the partition scanning of the first line and begun the partition scanning of the second line. This synchronization of partition scanning with the LCD screen's line-by-line scanning ensures the accuracy of the displayed colors and avoids color crosstalk.

[0062] Optionally, the scanning of the LCD display can be completely synchronized with the scanning of the light valve modulator, or it can be earlier than the light valve modulator. For example, while the LCD display is scanning rows 1 to 5, the light valve modulator can simultaneously scan the areas corresponding to rows 1 to 5.

[0063] For example, while the LCD screen has completed scanning rows 1 to 5 and is in the process of scanning rows 6 to 10, the light valve modulator can complete the scanning of the area corresponding to rows 1 to 5 of the LCD screen before the LCD screen has completed scanning rows 6 to 10.

[0064] The embodiments provided in this application establish a light valve modulator between the LCD display and the backlight. A set of control signals is determined based on the refresh rate, resolution, and resolution of the LCD display and the light valve modulator. During the display of one frame of an image, the LCD display is controlled to perform line scanning based on the progressive scan signal. Based on the line scanning position of the LCD display, the light valve modulator is controlled to perform partition scanning based on the partition scan signal. The backlight is controlled to perform color switching based on the color control signal, so that the pixel row corresponding to the line scanning position on the LCD display displays the color corresponding to each monochrome image in a set of monochrome images. This solves the technical problem in related technologies where it is impossible to simultaneously reduce the number of colors displayed and lower costs. Through the partition control of the light valve modulator, precise matching between the backlight and the content displayed on the LCD display is achieved, reducing color crosstalk and improving display quality. Furthermore, while reducing color crosstalk, compared to high refresh rate LCD projection display solutions, this application can use a relatively low refresh rate, reducing the bandwidth requirements of the display controller IC. Moreover, it does not require high IC bandwidth and liquid crystal response time, making it feasible under existing technology conditions, thus reducing costs to some extent.

[0065] In an exemplary embodiment, the resolution of the light valve modulator is less than or equal to the resolution of the LCD display screen, and a set of control signals includes a set of display timing signals for monochrome images; step 502 includes:

[0066] Based on the refresh rate and resolution of the LCD screen, the progressive scan cycle of the LCD screen is determined, and a progressive scan signal is generated based on the progressive scan cycle of the LCD screen. Based on the resolution of the light valve modulator and the resolution of the LCD screen, the scan ratio between the LCD screen and the light valve modulator is determined, and a partition scan signal is generated based on the scan ratio and the progressive scan signal of the LCD screen. Based on the image data of the image to be displayed and the refresh rate of the LCD screen, a set of monochrome image display timing signals is determined. Based on the display timing signals, a color light control signal is generated.

[0067] It should be noted that resolution refers to the ability of a display device or optical device to distinguish the smallest detail, usually expressed in pixels, such as 1080P (1920x1080 pixels) or 4K (3840x2160 pixels). The resolution of a light valve modulator can be less than or equal to the resolution of an LCD display.

[0068] The progressive scan cycle of an LCD display is the time required for the display to complete one scan of data from top to bottom, and it is related to the refresh rate and resolution. For example, with an LCD refresh rate of 240Hz, the display time for one frame is approximately 4.16ms (1000ms / 240Hz). For a 1080-line LCD display, the progressive scan cycle can be calculated by dividing the total display time by the number of lines, i.e., 4.16ms / 1080 ≈ 3.85μs (microseconds).

[0069] The scan ratio between the LCD screen and the light valve modulator represents the relative resolution of the two devices. This ratio determines how the light valve modulator performs zone scanning control based on the row scanning positions of the LCD screen. For example, if the LCD screen has a resolution of 1080P, the light valve modulator has a resolution of 216P, and both have the same refresh rate, the corresponding scan ratio is 5:1. This means that when the LCD screen scans 5 lines, the light valve modulator scans 1 line.

[0070] A set of control signals includes progressive scan signals, partition scan signals, a set of monochrome image display timing signals, and color control signals. Specifically, the progressive scan signals can be signals used to control the LCD screen to refresh display data line by line, ensuring that image data is updated sequentially. The partition scan signals can be signals used to control the light valve modulator's partition scanning, adjusting the backlight brightness based on the LCD screen's scanning position to achieve finer brightness control and color management. Optionally, the display area of ​​the light valve modulator can be divided into several horizontal areas, each partition corresponding to a set of pixel rows on the LCD screen. The number and size of the partitions can be determined based on the light valve modulator's resolution and system settings. The image data to be displayed refers to the digital information of the image to be displayed on the LCD screen, including brightness, color, and position data. The image data can be used to drive the LCD screen to display the image. The set of monochrome image display timing signals can be signals used to control the display of image data on the LCD screen, indicating when to start loading image data, when to update the display, and when to switch colors. The color control signals can be signals used to control the colors displayed by the backlight, ensuring accurate color display.

[0071] In this embodiment, by synchronizing the partition scanning of the light valve controller with the line scanning of the LCD display, color aliasing between adjacent subframes is avoided, thus improving color purity. Furthermore, by introducing a light valve modulator, the bandwidth requirements of the display IC and the response time of the liquid crystal can be reduced to some extent, allowing for more flexible selection of ICs and liquid crystal materials, and reducing power consumption. Simultaneously, the resolution of the light valve modulator can be lower than that of the LCD display, thereby reducing hardware costs.

[0072] In one exemplary embodiment, determining a set of monochrome image display timing signals based on image data of the image to be displayed and the refresh rate of the LCD display includes:

[0073] Based on the image data of the image to be displayed, determine the color requirements of the image to be displayed, where the color requirements are the pixel percentage requirements of different color channels;

[0074] Based on the color requirements of the image to be displayed and the refresh rate of the LCD screen, a display timing signal is determined. The display timing signal carries the display order of the monochrome images in a set of monochrome images and the display duration of each monochrome image.

[0075] Among them, color requirements can refer to the brightness value requirements of each pixel in the three color channels R, G, and B of the image to be displayed. They can be used to determine the display order and duration of monochrome images, as well as the color intensity of the backlight.

[0076] In one example, a projection system using a 240Hz refresh rate, 1080P resolution LCD display and a 240x1080 resolution light valve modulator is used to illustrate how to determine the display timing signal and color light control signal based on the color requirements of the image to be displayed. The specific steps are as follows:

[0077] Based on the RGB brightness information of the image to be displayed, the brightness requirements of the image on each color channel are calculated, thereby determining the color tendency of the image to be displayed. For example, if the image to be displayed is a sky image with a large area of ​​blue, the corresponding blue channel pixel ratio requirement is relatively high; if the image to be displayed is a grassland image with many green plants, the corresponding green channel pixel ratio requirement is relatively high.

[0078] For example, after determining the color requirements of the image to be displayed based on the image data of the image to be displayed, a display timing signal can be determined based on the color requirements of the image to be displayed and the refresh rate of the LCD display screen, so as to determine the color light control signal based on the display timing signal.

[0079] In practice, the display controller of a projection system can incorporate an FPGA (Field-Programmable Gate Array) to achieve precise synchronization between the LCD screen, light valve modulator, and backlight. An FPGA is a programmable integrated circuit commonly used in signal processing, control logic, and data flow management. A precise clock signal is generated internally or externally within the FPGA, serving as the reference clock for synchronization control. The frequency of the clock signal is typically matched to the refresh rate of the LCD screen to ensure accurate synchronization. Based on the scan ratio between the LCD screen and the light valve modulator, the logic control circuitry in the FPGA calculates the on and off times of each partition of the light valve modulator. This usually involves frequency division and delay processing of the reference clock signal to ensure synchronization between the partition signals of the light valve modulator and the line scan signals of the LCD screen. The FPGA generates color control signals for the backlight based on the display timing signals to match the subframe times of different color channels displayed on the LCD screen. Thus, based on the above steps, a set of control signals is determined and sent to the LCD screen, light valve controller, and backlight through the FPGA's output pins.

[0080] In this embodiment, by analyzing the image data of the image to be displayed, the color requirements of the image to be displayed can be determined, thereby precisely controlling the display of color subframes in the display sequence to optimize the color performance of the image to be displayed.

[0081] In one exemplary embodiment, a set of monochrome images includes a monochrome image of the R channel, a monochrome image of the G channel, and a monochrome image of the B channel. The display order of the monochrome images in the set of monochrome images is either a first display order or a second display order. The first display order is to display the monochrome images of the R channel, the monochrome images of the G channel, and the monochrome images of the B channel in sequence. The second display order is to display the monochrome images of the R channel, the monochrome images of the G channel, the monochrome images of the B channel, and the monochrome images of the G channel in sequence.

[0082] Based on the color requirements of the image to be displayed and the refresh rate of the LCD screen, the display timing signals are determined, including:

[0083] When the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is greater than or equal to a preset proportion, the display order of the monochrome images in a set of monochrome images is determined as the second display order, wherein the proportion of sub-pixels in the G channel of the image to be displayed is the ratio of the total brightness of the green sub-pixels in the image to the total brightness in the image to be displayed.

[0084] When the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is less than a preset ratio, and the refresh rate of the LCD screen is greater than or equal to the preset refresh rate, the display order of the monochrome images in a set of monochrome images is determined as the second display order.

[0085] Based on the refresh rate of the LCD screen and the display order of the monochrome images in a set of monochrome images, the display duration of each monochrome image is determined.

[0086] A display timing signal is generated based on the display order of the monochrome images in a set of monochrome images and the display duration of each monochrome image.

[0087] It should be noted that a set of monochrome images may include monochrome images of the R channel, monochrome images of the G channel, and monochrome images of the B channel. A set of monochrome images is a set of monochrome images separated from the image to be displayed, each containing only red, green, and blue information, and is used for sequential display and combined to form the image to be displayed.

[0088] The first display order can be the timing of displaying monochrome images in the natural RGB order; the second display order can be the display of monochrome images in the order of red (R), green (G), blue (B), and then back to green (G) under specific conditions, i.e., RGBG, which is used to increase the frequency of green image display in order to reduce flickering and improve display effect.

[0089] The subpixel percentage of the G channel can be defined as the ratio of the total brightness of green subpixels in the image to the total brightness of the image. The total brightness of the image can be the sum of the brightness of red, green, and blue subpixels. Specifically, the subpixel percentage of the G channel can be used to evaluate the proportion of green components in the image; similarly, the subpixel percentage of the R channel can be used to evaluate the proportion of red components, and the subpixel percentage of the B channel can be used to evaluate the proportion of blue components.

[0090] The preset ratio can be used as a threshold to determine whether a second display order is needed. It is usually set based on the human eye's sensitivity to green flicker, ensuring that in images with a high green content, the green display frequency can be enhanced to the point of avoiding flicker.

[0091] The preset refresh rate can be used to determine whether the minimum refresh rate required for the second display order can be met, ensuring that the LCD screen can complete the display of the additional G channels within one frame, thus avoiding a decrease in display quality.

[0092] For example, if the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is greater than or equal to a preset proportion, or if the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is less than a preset proportion and the refresh rate of the LCD display is greater than or equal to a preset refresh rate, the display order of the monochrome images in a set of monochrome images can be determined as a second display order. If the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is less than a preset proportion, the display order of the monochrome images in a set of monochrome images can be determined as a first display order.

[0093] In one example, suppose there is a projection system with an adjustable LCD screen refresh rate and a resolution of 1080P (1920x1080 pixels). Perform color analysis on the image to be displayed to calculate whether the proportion of green subpixels in the image is greater than or equal to a preset proportion (e.g., 50%).

[0094] When the proportion of green subpixels is greater than or equal to 50%, a second display order (RGBG) will be used to increase the green display frequency and reduce flicker.

[0095] Even if the proportion of green subpixels is less than 50%, but the refresh rate of the LCD screen is greater than or equal to the preset refresh rate (such as 240Hz), the second display order (RGBG) will still be used to increase the green display frequency by taking advantage of the high refresh rate, thereby further improving the display quality.

[0096] Based on the LCD screen's refresh rate (e.g., 240Hz) and a determined display order, the display duration for each monochrome image is calculated. For example, when using the second display order (RGBG), one frame's display time (16.67ms) is divided into four segments, each used to display an R, G, B, G monochrome image, ensuring that each color has sufficient time to be accurately displayed. According to the determined display order and the display duration of each monochrome image, a display timing signal is generated to control the LCD screen to display the R, G, B, G monochrome images in sequence. Simultaneously, the signal includes instructions to control the backlight to emit corresponding color light at specific times, as well as partitioned brightness control information for the light valve modulator, ensuring optimized display effects.

[0097] This embodiment effectively reduces the human eye's perception of green flicker by increasing the frequency of green display, significantly improving display quality, especially in images with a high proportion of green. Dynamically adjusting the display order based on the image's color requirements allows the projection system to intelligently adapt to the display needs of different images, enhancing display flexibility and adaptability. Furthermore, the addition of a light valve modulator enables precise brightness control of the backlight based on the content displayed on the LCD screen, reducing energy waste while improving brightness and contrast.

[0098] In one exemplary embodiment, the light valve modulator includes a set of pixel units; according to the row scan position of the LCD display, controlling the light valve modulator to perform a partitioned scan operation via a partitioned scan signal includes:

[0099] Based on the line scan position of the LCD display, a target pixel unit is determined in a group of pixel units, wherein the target pixel unit is the pixel unit corresponding to the line scan position of the LCD display.

[0100] Based on the partition scan signal, the target pixel unit is controlled to be in the on state, and the remaining pixel units are controlled to be in the off state. The remaining pixel units are the pixel units other than the target pixel unit in a group of pixel units.

[0101] It should be noted that a light valve modulator may include a group of pixel units, which can have the ability to control the light flux. These pixel units can be understood as the "pixels" of the light valve modulator. The pixel units can be turned on or off according to the signal to adjust the brightness and illumination range of the backlight.

[0102] The target pixel unit can be the pixel unit corresponding to the row scan position of the LCD display, that is, the pixel unit of the light valve modulator corresponding to the pixel in the LCD display being scanned during the current row scan. The remaining pixel units can be any pixel units in a group of pixel units other than the target pixel unit.

[0103] For example, during the display of an image to be displayed, while controlling the LCD screen to perform line scanning operation according to the line scanning signal, the target pixel unit in a group of pixel units is determined according to the line scanning position of the LCD screen. According to the partition scanning signal, the working state of the target pixel unit is controlled to be turned on, and the remaining pixel units are controlled to be turned off, thereby realizing the dynamic turning on or off of its pixel units to form a light band scanning from top to bottom, avoiding color crosstalk and improving the display effect.

[0104] Optionally, each row of pixel units in the light valve modulator corresponds to one or more rows of pixels in the LCD display. Each row of pixel units in the light valve modulator can constitute an independent control area, which can be used to control the displayed color corresponding to one or more rows of pixels on the LCD display. Each row of pixel units in the light valve modulator can also serve as a control area for one or more rows of pixels in the LCD display.

[0105] In one example, suppose in the projection system, the LCD screen has a resolution of 1080P (1920x1080 pixels) and a refresh rate of 240Hz. The light valve modulator has a resolution of 216x1080 pixels and also operates at a refresh rate of 240Hz.

[0106] When the LCD screen begins scanning data downwards from the first line, the display controller determines the corresponding target pixel unit in the light valve modulator based on the line scan position of the LCD screen. Since the resolution of the light valve modulator is relatively low at this time, the pixel unit of each line of the light valve modulator corresponds to the pixels of multiple lines of the LCD screen. For example, the pixel unit of the first line of the light valve modulator corresponds to the pixels of the first to fifth lines of the LCD screen.

[0107] Based on the partitioned scanning signal, the display controller controls the target pixel unit to be in the on state, while simultaneously turning off the remaining pixel units in the light valve modulator except for the target pixel unit. Thus, when the LCD screen displays lines 1-5, the first row of pixel units in the light valve modulator will control the brightness of the backlight. Alternatively, while the LCD screen has completed scanning lines 1-5 and is scanning lines 6-10, the light valve modulator can complete the scanning of the first row of pixel units corresponding to lines 1-5 of the LCD screen before the LCD screen completes scanning lines 6-10. In other words, the scanning of the LCD screen can be completely synchronized with the scanning of the light valve modulator, or it can be earlier than the light valve modulator, to match the monochrome image being displayed on the LCD screen.

[0108] As the LCD screen continues to scan downwards, the display controller will determine the new target pixel unit based on the new line scan position of the LCD screen to synchronize the backlight brightness control with the content displayed on the LCD screen.

[0109] This embodiment utilizes partitioned scanning of the light valve modulator to precisely control the brightness and illumination area of ​​the backlight, ensuring that only the corresponding area is illuminated when displaying an image of a specific color. This avoids color mixing and reduces potential color crosstalk between adjacent color subframes. Partitioned scanning allows the resolution of the light valve modulator to be significantly lower than that of the LCD display, reducing the complexity and cost of the light valve modulator and lowering the stringent requirements for IC bandwidth and liquid crystal response time.

[0110] In one exemplary embodiment, during the process of sequentially scanning the LCD display downwards, a new target pixel unit is determined based on the new row scan position of the LCD display.

[0111] The new target pixel unit in the control light valve modulator is turned on, while the old target pixel unit in the previous row is turned off.

[0112] It should be noted that the process of sequentially scanning rows on an LCD screen involves the display controller sending image data and scan signals to the LCD screen row by row. The scan of each row begins with the control of a gate signal, followed by the transmission of image data via column signals, until all pixels in that row have been updated. Row scanning is fundamental to displaying images on an LCD screen, ensuring that each row of pixels receives the correct image information at the correct time.

[0113] The target pixel unit can be a specific row or a set of specific rows selected on the light valve modulator for synchronous control of the backlight. Specifically, as the LCD screen continues to scan downwards, the display controller will determine a new target pixel unit based on the new line scan position of the LCD screen, control it to turn on, and simultaneously turn off the previous target pixel unit to ensure that the backlight brightness control is synchronized with the content displayed on the LCD screen.

[0114] Through this embodiment, precise row-to-row control ensures that when displaying each color field (red, green, blue), the backlight only illuminates the row related to the currently displayed color, effectively avoiding color crosstalk and improving display quality.

[0115] In one exemplary embodiment, the backlight includes LEDs with an R channel, LEDs with a G channel, and LEDs with a B channel; controlling the backlight to perform a color switching operation via a color control signal includes:

[0116] According to the target color indicated by the color light control signal, the LEDs of the color channel corresponding to the target color in the backlight are controlled to be turned on, and the remaining LEDs are controlled to be turned off, so as to control the pixel row on the LCD screen corresponding to the line scan position to display the color corresponding to each monochrome image through the target pixel unit. The remaining LEDs are the LEDs of the color channel corresponding to colors other than the target color in the backlight.

[0117] It should be noted that the backlight can be a light source component in the projection system used to illuminate the LCD screen, typically containing LEDs with three different color channels: R (red), G (green), and B (blue). The target color indicated by the color control signal can be the current color indicated by the display timing sequence, and only one target color exists at any given time. For example, in the case of RGB display timing, the target colors indicated by the color control signal can be RGB sequentially. When the display timing indicator shows R, the corresponding target color is only R; when the display timing indicator shows G, the corresponding target color is only G; and when the display timing indicator shows B, the corresponding target color is only B.

[0118] For example, when controlling the LCD display to perform line scanning operation according to the progressive scan signal and controlling the light valve modulator to perform partition scanning operation according to the partition scan signal, based on the target color indicated by the color control signal, the LEDs of the color channel corresponding to the target color in the backlight are controlled to be turned on, and the remaining LEDs are controlled to be turned off, so as to control the pixel row on the LCD display corresponding to the line scan position to display the color corresponding to each monochrome image through the target pixel unit. It should be noted that when the backlight is displaying one frame of image, at any given time, only the LEDs of the color channel corresponding to the target color in the backlight are controlled to be turned on, and the remaining LEDs are controlled to be turned off.

[0119] In one example, assuming the LCD screen is displaying a monochrome image in the R channel, the display controller determines, based on the display timing signal, that the current color to be displayed is red (the monochrome image in the R channel). Based on the color light control signal, the display controller turns on the R channel LEDs in the backlight while turning off the G and B channel LEDs, ensuring that only red light illuminates the LCD screen. Simultaneously, the display controller determines the target pixel unit in the light valve modulator based on the line scan position of the LCD screen, controlling the target pixel unit to be on, while the remaining pixel units in the light valve modulator are off. For example, when the LCD screen scans lines 1-5, the first row pixel unit of the light valve modulator controls the brightness of the backlight to illuminate the corresponding line of the LCD screen. The on of the target pixel unit causes the pixel row corresponding to the line scan position on the LCD screen to display a red image, while the off of the remaining pixel units in the light valve modulator prevents other areas of the backlight from illuminating the LCD screen, thus avoiding color crosstalk.

[0120] To better understand the field-sequence LCD projection method in the embodiments of this application, an example is provided for illustration. (Refer to...) Figure 7 , Figure 7 This is a schematic diagram of an optional field-sequence LCD projection display according to an embodiment of this application. For example... Figure 7 As shown:

[0121] The RGB LEDs of the backlight sequentially illuminate the light valve modulator. The light valve modulator (LCD, LCOS, or DLP) scans up and down sequentially, opening each row of pixels from the first to the last. Its function is to create a light band that sweeps across the screen from top to bottom for each monochromatic light beam. Simultaneously, the light valve modulator shuts off the signal in the scanned areas, awaiting the next scan. The display controller, needing to display a color image, performs a line-by-line scan of the LCD screen, synchronizing with the light band scanned by the light valve modulator. This ensures that the light valve modulator (LCD, LCOS, or DLP) on the LCD screen illuminates multiple rows of pixels with its light band. The separated red, green, and blue beams illuminate the LCD screen in a time-division scanning manner, and then the image is projected through a projection lens. This scheme avoids the RGB color sequence disorder that can occur when the LCD screen displays the first row of pixels while the last row is still displaying the previous frame.

[0122] In this embodiment, the partitioned scanning of the light valve modulator, combined with the color light control signal, ensures that only the light of the color currently to be displayed illuminates a specific row of the LCD screen through the target pixel unit, avoiding color crosstalk between different color subframes and improving display clarity. By precisely controlling the LEDs in the backlight corresponding to the color channel of the target color, it is ensured that when displaying a monochrome image of a specific color, the backlight provides only light of that color, improving color accuracy and image quality. Furthermore, through precise LED control and partitioned scanning of the light valve modulator, display efficiency is improved, the requirements for IC bandwidth and liquid crystal response time are reduced, and the overall performance of the projection display system is enhanced.

[0123] In one exemplary embodiment, the above method further includes:

[0124] Based on the image data of the image to be displayed, determine whether there are areas in the image to be displayed where the brightness value of pixels is lower than the first preset brightness value;

[0125] In the case of a first target area in the image to be displayed where the brightness value of a pixel is lower than the first preset brightness value, a partition brightness control signal is generated based on the brightness value of the first target area and the brightness value of the first remaining area. The partition brightness control signal is used to indicate the brightness of the LEDs in different partitions of the backlight. The first remaining area is the other areas in the image to be displayed besides the first target area.

[0126] During the process of controlling the LCD display to perform line scanning operation according to the progressive scan signal, the brightness of the LEDs in different zones of the backlight is controlled according to the zone brightness control signal so that the brightness of the first target area is lower than the brightness of the first remaining area.

[0127] It should be noted that the first preset brightness value is a threshold used to determine whether the brightness of pixels in the image to be displayed is high enough. Areas below this value are considered to be low-brightness first target areas. The magnitude of the first preset brightness value can be obtained experimentally, and is generally a relatively dark brightness value when displayed.

[0128] The first target area can be a region in the image to be displayed where the brightness value of a pixel is lower than a first preset brightness value, and it is usually more critical when displaying details in dark areas. The first remaining area can be other areas in the image to be displayed besides the first target area, and it is usually relatively brighter.

[0129] The zone brightness control signal can be a signal generated by the display controller to control the brightness of the LEDs in different zones of the backlight to meet the brightness requirements of the first target area and the first remaining area.

[0130] Optionally, the light valve modulator can adjust the light intensity illuminating the LCD screen based on the display details of the image to be displayed, so that the dark areas on the screen can achieve a near-pure black effect, thereby increasing the contrast of the LCD projection and outputting the best projection effect. Specifically, by setting a first preset brightness value, when there is a first target area in the image to be displayed where the brightness value of a pixel is lower than the first preset brightness value, a partition brightness control signal is generated based on the brightness value of the first target area and the brightness value of the first remaining area. During the process of controlling the LCD screen to perform line scanning operation according to the line scanning signal, the brightness of the LEDs in different partitions of the backlight is controlled according to the partition brightness control signal, so that the brightness of the first target area is lower than the brightness of the first remaining area, thereby achieving a near-pure black effect in the dark areas of the screen. This allows the LCD screen to better display the details of both bright and dark areas of the image to be displayed, resulting in a softer display.

[0131] This embodiment utilizes dynamically adjusted backlight partitions to create deeper shadows and brighter highlights, effectively enhancing image contrast and making the displayed content more vivid and detailed. Simultaneously, reducing the brightness of the LEDs in the first target area when displaying shadow areas saves unnecessary energy consumption, thus optimizing the overall energy efficiency of the display system.

[0132] In one exemplary embodiment, the above method further includes:

[0133] Based on the image data of the image to be displayed, determine whether there are areas in the image where the brightness value of a pixel is lower than the second preset brightness value;

[0134] In the case of a second target area in the image to be displayed where the brightness value of a pixel is lower than the second preset brightness value, an opening adjustment signal for the pixel unit is generated based on the brightness value of the second target area and the brightness value of the remaining area. The opening adjustment signal is used to indicate the adjustment of the opening of a group of pixel units corresponding to the second target area. The second remaining area is the other area in the image to be displayed besides the second target area.

[0135] During the process of controlling the LCD display to perform line scanning operation according to the line scanning signal, the opening degree of a group of pixel units corresponding to the second target area is controlled according to the opening degree adjustment signal so that the brightness of the displayed second target area is lower than the brightness of the second remaining area.

[0136] It should be noted that the second preset brightness value is a threshold used to determine whether the brightness of pixels in the image to be displayed is sufficiently high. Areas below this value are considered as low-brightness second target areas. The magnitude of the second preset brightness value can be obtained experimentally, and is generally a relatively dark brightness value for display. The magnitude of the second preset brightness value can be the same as or different from the first preset brightness value.

[0137] The second target area can be a region in the image to be displayed where the brightness value of a pixel is lower than a second preset brightness value, and it is usually more critical when displaying details in dark areas. The second remaining area can be other areas in the image to be displayed besides the second target area, and it is usually relatively brighter.

[0138] The aperture adjustment signal is a signal used to control the transmittance of pixel units in a light valve modulator. It is generated based on the brightness difference between the second target area and the second remaining area, and can be used to adjust the brightness of the corresponding pixel units in the second target area so that the brightness of the displayed second target area is lower than that of the second remaining area. For example, for pixels with extremely low brightness, the aperture adjustment signal may instruct the corresponding pixel unit to be completely turned off, while for pixels with brightness slightly higher than a preset brightness value, only a slight adjustment of the aperture may be needed to reduce light transmission.

[0139] Optionally, the light valve modulator can adjust the light intensity illuminating the LCD screen based on the display details of the image to be displayed, so that the dark areas on the screen can achieve a near-pure black effect, thereby increasing the contrast of the LCD projection and outputting the best projection effect. Specifically, a second preset brightness value is set, and during the process of controlling the LCD screen to perform line scanning operation according to the progressive scan signal, the brightness of the backlight transmitted from the pixel unit is controlled according to the opening adjustment signal, so that the brightness of the second target area is lower than the brightness of the second remaining area, thereby achieving a near-pure black effect in the dark areas of the screen. This allows the LCD screen to better display the details of both bright and dark areas of the image to be displayed, resulting in a softer display.

[0140] In this embodiment, the light valve modulator can dynamically adjust the opening degree according to the image data. By adjusting the opening degree of the second target area, the brightness of the second target area is reduced, making the dark areas deeper and the bright areas brighter, effectively improving the contrast of the image, making the displayed content more vivid and the details richer.

[0141] Specifically, refer to Figure 8 , Figure 8 This is a schematic diagram of an optional second display timing according to an embodiment of this application. For example... Figure 8 As shown, the LCD refresh rate is 240Hz. By adding a G subframe signal, a G frame refresh rate of 120Hz is achieved. The corresponding display order is RGBG. When displaying a monochrome image in RGBG order, the corresponding R, G, and B lamps in the backlight are turned on sequentially. That is, the R, G, B, and G lamps are turned on in sequence. The light valve modulator and the LCD display are in working condition.

[0142] Adding a G-frame can prevent flickering. Compared to related technologies that require refreshing RGB image data at least twice in each subfield, turning off the light source during the first full-screen refresh and then turning it on again during the second refresh while the image is ready, this method turns the light off during the first refresh of the subframe, interpolating black to ensure it turns off during the full-screen refresh. This halves the lighting time within a single frame, reducing the light's duty cycle to only 50%, wasting light resources, and lowering brightness.

[0143] Experiments have shown that adding a green subframe in this application can increase the lamp utilization rate to nearly 90%, double the brightness, and reduce the requirements for liquid crystal response time (Ton+Toff≤4.17ms), which is beneficial for the selection of ICs and liquid crystal materials and greatly reduces costs.

[0144] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0145] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM (Read-Only Memory) / RAM (Random Access Memory), magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of this application.

[0146] According to another aspect of the embodiments of this application, a field-sequential LCD projection system is also provided. The projection system includes an LCD display screen, a light valve modulator, a backlight, and a display controller. The light valve modulator is superimposed on the LCD display screen and located between the LCD display screen and the backlight. This field-sequential LCD projection system can be used to implement the field-sequential LCD projection method provided in the above embodiments, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0147] Figure 9 This is a structural block diagram of an optional field-sequence LCD projection system according to an embodiment of this application, such as... Figure 9 As shown, the field-sequenced LCD projection system includes:

[0148] The display controller 902 is configured to, when an image to be displayed exists, decompose the image to be displayed into a set of monochrome images, wherein the set of monochrome images includes a monochrome image of each image channel in a set of image channels; determine a set of control signals based on the refresh rate of the LCD display, the resolution of the LCD display, and the resolution of the light valve modulator, wherein the set of control signals includes a progressive scan signal of the LCD display, a partition scan signal of the light valve modulator, and a color control signal of the backlight; during the display of one frame of the image to be displayed, the controller controls the LCD display to perform a line scan operation according to the progressive scan signal, controls the light valve modulator to perform a partition scan operation through the partition scan signal according to the line scan position of the LCD display, and controls the backlight to perform a color switching operation through the color control signal, so that the pixel row on the LCD display corresponding to the line scan position displays the color corresponding to each monochrome image in the set of monochrome images;

[0149] LCD display 904 is used to perform line scanning operation according to the line scanning signal in response to the control of the display controller;

[0150] The light valve modulator 906 is used to perform partition scanning operation by means of partition scanning signal in response to the control of the display controller and according to the row scanning position of the LCD display screen.

[0151] The backlight 908 is used to respond to the control of the display controller and perform a color switching operation according to the color light control signal so that the pixel row corresponding to the row scan position on the LCD display displays the color corresponding to each monochrome image in a set of monochrome images.

[0152] It should be noted that the display controller 902 in this embodiment can be used to execute the above steps S502 to S506, and the LCD display 904, light valve modulator 906 and backlight 908 in this embodiment can work together to execute the above step S506.

[0153] The embodiments provided in this application establish a light valve modulator between the LCD display and the backlight. A set of control signals is determined based on the refresh rate, resolution, and resolution of the LCD display and the light valve modulator. During the display of one frame of an image, the LCD display is controlled to perform line scanning based on the progressive scan signal. Based on the line scanning position of the LCD display, the light valve modulator is controlled to perform partition scanning based on the partition scan signal. The backlight is controlled to perform color switching based on the color control signal, so that the pixel row corresponding to the line scanning position on the LCD display displays the color corresponding to each monochrome image in a set of monochrome images. This solves the technical problem in related technologies where it is impossible to simultaneously reduce the number of colors displayed and lower costs. Through the partition control of the light valve modulator, precise matching between the backlight and the content displayed on the LCD display is achieved, reducing color crosstalk and improving display quality. Furthermore, while reducing color crosstalk, compared to high refresh rate LCD projection display solutions, this application can use a relatively low refresh rate, reducing the bandwidth requirements of the display controller IC. Moreover, it does not require high IC bandwidth and liquid crystal response time, making it feasible under existing technology conditions, thus reducing costs to some extent.

[0154] In one exemplary embodiment, the resolution of the light valve modulator is less than or equal to the resolution of the LCD display screen, and the set of control signals includes a set of display timing signals for monochrome images; the display controller 902 is further configured to:

[0155] Based on the refresh rate, resolution, and light valve modulator resolution of the LCD screen, a set of control signals is determined, including: determining the progressive scan cycle of the LCD screen based on the refresh rate and resolution, and generating a progressive scan signal based on the progressive scan cycle; determining the scan ratio between the LCD screen and the light valve modulator based on the resolution of the light valve modulator and the resolution of the LCD screen, and generating a zone scan signal based on the scan ratio and the progressive scan signal of the LCD screen; determining a set of monochrome image display timing signals based on the image data of the image to be displayed and the refresh rate of the LCD screen; and generating a color light control signal based on the display timing signals.

[0156] In an exemplary embodiment, the display controller 902 is further configured to: determine the color requirements of the image to be displayed based on the image data of the image to be displayed, wherein the color requirements are the pixel ratio requirements of different color channels; and determine a display timing signal based on the color requirements of the image to be displayed and the refresh rate of the LCD display screen, wherein the display timing signal carries the display order of the monochrome images in a set of monochrome images and the display duration corresponding to each monochrome image.

[0157] In one exemplary embodiment, a set of monochrome images includes a monochrome image of the R channel, a monochrome image of the G channel, and a monochrome image of the B channel. The display order of the monochrome images in the set of monochrome images is either a first display order or a second display order. The first display order is to display the monochrome images of the R channel, the monochrome images of the G channel, and the monochrome images of the B channel in that order. The second display order is to display the monochrome images of the R channel, the monochrome images of the G channel, the monochrome images of the B channel, and the monochrome images of the G channel in that order.

[0158] The display controller 902 is further configured to: determine the display order of monochrome images in a set of monochrome images as a second display order when the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is greater than or equal to a preset proportion, wherein the proportion of sub-pixels in the G channel of the image to be displayed is the ratio of the total brightness of the green sub-pixels in the image to be displayed to the total brightness of the image to be displayed; determine the display order of monochrome images in a set of monochrome images as a second display order when the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is less than a preset proportion and the refresh rate of the LCD display is greater than or equal to a preset refresh rate; determine the display duration corresponding to each monochrome image based on the refresh rate of the LCD display and the display duration corresponding to each monochrome image; and generate a display timing signal based on the display order of the monochrome images in a set of monochrome images and the display duration corresponding to each monochrome image.

[0159] In one exemplary embodiment, the light valve modulator includes a set of pixel units; the display controller 902 is further configured to: determine a target pixel unit in the set of pixel units according to the line scan position of the LCD display, wherein the target pixel unit is a pixel unit corresponding to the line scan position of the LCD display; control the working state of the target pixel unit to be in an on state according to the partition scan signal, and control the remaining pixel units to be in a off state, wherein the remaining pixel units are pixel units in the set of pixel units other than the target pixel unit.

[0160] In one exemplary embodiment, each row of pixel units of the light valve modulator corresponds to one or more rows of pixels in an LCD display.

[0161] In one exemplary embodiment, the display controller 902 is further configured to: determine a new target pixel unit based on the new line scan position of the LCD display during the sequential downward line scan of the LCD display; control the new target pixel unit in the light valve modulator to turn on, while turning off the old target pixel unit of the previous line.

[0162] In one exemplary embodiment, the backlight includes LEDs in the R channel, G channel, and B channel; the display controller 902 is further configured to: control the LEDs in the backlight corresponding to the target color to be in an on state according to the target color indicated by the color control signal, and control the remaining LEDs to be in an off state, so as to control the pixel row on the LCD display screen corresponding to the line scan position to display the color corresponding to each monochrome image through the target pixel unit, wherein the remaining LEDs are LEDs in the backlight corresponding to the color channels of colors other than the target color.

[0163] In one exemplary embodiment, the display controller 902 is further configured to: determine, based on image data of the image to be displayed, whether there are regions in the image to be displayed where the brightness value of pixels is lower than a preset brightness value; if there is a target region in the image to be displayed where the brightness value of pixels is lower than the preset brightness value, generate a partition brightness control signal based on the brightness value of the target region and the brightness value of the remaining region, wherein the partition brightness control signal is used to indicate the brightness of the LEDs in different partitions of the backlight, and the remaining region is other regions in the image to be displayed besides the target region; during the process of controlling the LCD display to perform a line scanning operation according to the line scanning signal, control the brightness of the LEDs in different partitions of the backlight according to the partition brightness control signal, so that the brightness of the target region is lower than the brightness of the remaining region.

[0164] In an exemplary embodiment, the display controller 902 is further configured to: determine, based on image data of the image to be displayed, whether there exists a region in the image to be displayed where the brightness value of a pixel is lower than a second preset brightness value; if a second target region in the image to be displayed exists where the brightness value of a pixel is lower than the second preset brightness value, generate an opening adjustment signal for a pixel unit based on the brightness value of the second target region and the brightness value of the remaining region, wherein the opening adjustment signal is used to instruct the adjustment of the opening of a group of pixel units corresponding to the second target region, and the second remaining region is other regions in the image to be displayed besides the second target region; during the process of controlling the LCD display to perform a line scanning operation according to the line scanning signal, control the opening of a group of pixel units corresponding to the second target region according to the opening adjustment signal, so that the brightness of the displayed second target region is lower than the brightness of the second remaining region. It should be noted that the above modules can be implemented by software or hardware. For the latter, implementation can be achieved in the following ways, but is not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0165] According to another aspect of the embodiments of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein the program executes the steps in any of the above method embodiments when it is run.

[0166] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, ROMs, RAMs, portable hard drives, magnetic disks, or optical disks.

[0167] According to another aspect of the embodiments of this application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor is configured to perform the steps of any of the method embodiments described above via the computer program. In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0168] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0169] According to another aspect of the embodiments of this application, a computer program product is also provided, comprising a computer program / instructions containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by central processing unit 1001, it performs various functions provided in the embodiments of this application. The sequence numbers of the embodiments of this application above are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0170] Figure 10 A schematic block diagram of a computer system architecture for implementing embodiments of the present application is shown. Figure 10 As shown, the computer system 1000 includes a CPU (Central Processing Unit) 1001, which can perform various appropriate actions and processes according to programs stored in ROM 1002 or programs loaded into RAM 1003 from storage section 1008. Random access memory 1003 also stores various programs and data required for system operation. The CPU 1001, ROM 1002, and RAM 1003 are interconnected via bus 1004. An I / O (Input / Output) interface 1005 is also connected to bus 1004.

[0171] The following components are connected to I / O interface 1005: input section 1006 including keyboard, mouse, etc.; output section 1007 including CRT (Cathode Ray Tube), LCD (Liquid Crystal Display), etc., and speakers, etc.; storage section 1008 including hard disk, etc.; and communication section 1009 including network interface card, modem, etc. Communication section 1009 performs communication processing via a network such as the Internet. Drive 1010 is also connected to I / O interface 1005 as needed. Removable media 1011, such as disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1010 as needed so that computer programs read from them can be installed into storage section 1008 as needed.

[0172] Specifically, according to embodiments of this application, the processes described in the various method flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by central processing unit 1001, it performs various functions defined in the system of this application.

[0173] It should be noted that, Figure 10 The computer system 1000 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0174] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0175] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A field-sequence LCD projection method, characterized in that, An application in a projection system, the projection system including an LCD display, a light valve modulator, and a backlight, wherein the light valve modulator is superimposed on the LCD display and located between the LCD display and the backlight, the method comprising: In the presence of an image to be displayed, the image to be displayed is decomposed into a set of monochrome images, wherein the set of monochrome images includes a monochrome image of each image channel in a set of image channels; Based on the refresh rate of the LCD display, the resolution of the LCD display, and the resolution of the light valve modulator, a set of control signals is determined, wherein the set of control signals includes the progressive scan signal of the LCD display, the partition scan signal of the light valve modulator, and the color light control signal of the backlight. During the display of one frame of the image to be displayed, the LCD screen is controlled to perform a line scanning operation according to the line scanning signal. According to the line scanning position of the LCD screen, the light valve modulator is controlled to perform a partition scanning operation through the partition scanning signal, and the backlight is controlled to perform a color switching operation through the color light control signal, so that the pixel row on the LCD screen corresponding to the line scanning position displays the color corresponding to each monochrome image in the set of monochrome images.

2. The method according to claim 1, characterized in that, The resolution of the light valve modulator is less than or equal to the resolution of the LCD display screen, and the set of control signals includes the display timing signals of the set of monochrome images; The step of determining a set of control signals based on the refresh rate of the LCD display, the resolution of the LCD display, and the resolution of the light valve modulator includes: The progressive scan cycle of the LCD display is determined based on the refresh rate and resolution of the LCD display, and the progressive scan signal is generated based on the progressive scan cycle of the LCD display. Based on the resolution of the light valve modulator and the resolution of the LCD display, the scanning ratio between the LCD display and the light valve modulator is determined, and the partitioned scanning signal is generated based on the scanning ratio and the progressive scan signal of the LCD display. Based on the image data of the image to be displayed and the refresh rate of the LCD display screen, determine the display timing signal of the set of monochrome images; The color light control signal is generated based on the display timing signal.

3. The method according to claim 2, characterized in that, Determining the display timing signal of the set of monochrome images based on the image data of the image to be displayed and the refresh rate of the LCD display includes: Based on the image data of the image to be displayed, the color requirements of the image to be displayed are determined, wherein the color requirements are the pixel ratio requirements of different color channels; Based on the color requirements of the image to be displayed and the refresh rate of the LCD display, the display timing signal is determined, wherein the display timing signal carries the display order of the monochrome images in the set of monochrome images and the display duration corresponding to each monochrome image.

4. The method according to claim 3, characterized in that, The set of monochrome images includes a monochrome image of the R channel, a monochrome image of the G channel, and a monochrome image of the B channel. The display order of the monochrome images in the set of monochrome images is either a first display order or a second display order. The first display order is to display the monochrome images of the R channel, the monochrome images of the G channel, and the monochrome images of the B channel in that order. The second display order is to display the monochrome images of the R channel, the monochrome images of the G channel, the monochrome images of the B channel, and the monochrome images of the G channel in that order. The step of determining the display timing signal based on the color requirements of the image to be displayed and the refresh rate of the LCD display includes: When the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is greater than or equal to a preset proportion, the display order of the monochrome images in the group of monochrome images is determined to be the second display order, wherein the proportion of sub-pixels in the G channel of the image to be displayed is the ratio of the total brightness of the green sub-pixels in the image to be displayed to the total brightness in the image to be displayed. When the color requirement of the image to be displayed indicates that the proportion of sub-pixels in the G channel of the image to be displayed is less than a preset proportion, and the refresh rate of the LCD display screen is greater than or equal to the preset refresh rate, the display order of the monochrome images in the group of monochrome images is determined as the second display order. Based on the refresh rate of the LCD display screen and the display order of the monochrome images in the set of monochrome images, the display duration corresponding to each monochrome image is determined; The display timing signal is generated based on the display order of the monochrome images in the set of monochrome images and the display duration corresponding to each monochrome image.

5. The method according to claim 2, characterized in that, The light valve modulator includes a set of pixel units; The step of controlling the light valve modulator to perform a partition scanning operation through the partition scanning signal according to the row scanning position of the LCD display includes: Based on the row scan position of the LCD display, a target pixel unit in the group of pixel units is determined, wherein the target pixel unit is a pixel unit corresponding to the row scan position of the LCD display; According to the partition scan signal, the working state of the target pixel unit is controlled to be turned on, and the remaining pixel units are controlled to be turned off, wherein the remaining pixel units are the pixel units other than the target pixel unit in the group of pixel units.

6. The method according to claim 5, characterized in that, Each row of pixel units in the light valve modulator corresponds to one or more rows of pixels in the LCD display screen.

7. The method according to claim 5, characterized in that, The method further includes: During the process of sequentially scanning the LCD display downwards, a new target pixel unit is determined based on the new row scan position of the LCD display. The new target pixel unit in the light valve modulator is turned on, while the old target pixel unit in the previous row is turned off.

8. The method according to claim 5, characterized in that, The backlight includes LEDs with an R channel, an G channel, and a B channel; controlling the backlight to perform color switching operations via the color control signal includes: According to the target color indicated by the color light control signal, the LEDs of the color channel corresponding to the target color in the backlight are controlled to be turned on, and the remaining LEDs are controlled to be turned off, so as to control the pixel row on the LCD display screen corresponding to the line scan position to display the color corresponding to each monochrome image through the target pixel unit, wherein the remaining LEDs are the LEDs of the color channel in the backlight corresponding to colors other than the target color.

9. The method according to claim 5, characterized in that, The method further includes: Based on the image data of the image to be displayed, determine whether there are areas in the image to be displayed where the brightness value of a pixel is lower than a first preset brightness value; In the case where there is a first target area in the image to be displayed where the brightness value of a pixel is lower than the first preset brightness value, a partition brightness control signal is generated based on the brightness value of the first target area and the brightness value of the first remaining area. The partition brightness control signal is used to indicate the brightness of the LEDs in different partitions of the backlight. The first remaining area is the other area in the image to be displayed besides the first target area. During the process of controlling the LCD display to perform the line scanning operation according to the line scanning signal, the brightness of the LEDs in different zones of the backlight is controlled according to the zone brightness control signal, so that the brightness of the first target area is lower than the brightness of the first remaining area.

10. The method according to claim 5, characterized in that, The method further includes: Based on the image data of the image to be displayed, determine whether there are regions in the image to be displayed where the brightness value of a pixel is lower than a second preset brightness value; In the case where there is a second target area in the image to be displayed where the brightness value of a pixel is lower than the second preset brightness value, an opening adjustment signal for the pixel unit is generated based on the brightness value of the second target area and the brightness value of the remaining area. The opening adjustment signal is used to indicate the adjustment of the opening of a group of pixel units corresponding to the second target area. The second remaining area is other areas in the image to be displayed besides the second target area. During the process of controlling the LCD display to perform the line scanning operation according to the line scanning signal, the opening degree of a group of pixel units corresponding to the second target area is controlled according to the opening degree adjustment signal so that the brightness of the displayed second target area is lower than the brightness of the second remaining area.

11. A field-sequence LCD projection system, characterized in that, The projection system, using the method of any one of claims 1 to 10, comprises an LCD display screen, a light valve modulator, a backlight, and a display controller, wherein the light valve modulator is superimposed on the LCD display screen and located between the LCD display screen and the backlight, wherein... The display controller is configured to, when an image to be displayed exists, decompose the image to be displayed into a set of monochrome images, wherein the set of monochrome images includes a monochrome image of each image channel in a set of image channels; determine a set of control signals based on the refresh rate of the LCD display, the resolution of the LCD display, and the resolution of the light valve modulator, wherein the set of control signals includes a progressive scan signal of the LCD display, a partition scan signal of the light valve modulator, and a color control signal of the backlight; during the display of one frame of the image to be displayed, control the LCD display to perform a line scan operation according to the progressive scan signal, control the light valve modulator to perform a partition scan operation through the partition scan signal according to the line scan position of the LCD display, and control the backlight to perform a color switching operation through the color control signal, so that the pixel row on the LCD display corresponding to the line scan position displays the color corresponding to each monochrome image in the set of monochrome images; The LCD display screen is used to perform line scanning operation according to the line scanning signal in response to the control of the display controller; The light valve modulator is used to respond to the control of the display controller and perform partition scanning operation according to the row scanning position of the LCD display screen through the partition scanning signal; The backlight is used to respond to the control of the display controller and perform a color switching operation according to the color light control signal, so that the pixel row on the LCD screen corresponding to the row scanning position displays the color corresponding to each monochrome image in the set of monochrome images.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of the method according to any one of claims 1 to 10.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 10.

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