Display driving device and method with dynamic black suppression function

Abstract

The invention discloses a display driving device and method with a dynamic black suppression function. The device comprises an LVDS (Low Voltage Differential Signaling) interface module, an ambient light processing module, a dynamic black suppression module, a backlight control module and a source electrode driving module, wherein the LVDS interface module is used for transmitting an image signal output by an in-vehicle SoC chip to the dynamic black suppression module; the ambient light processing module is used for judging the current driving environment of the vehicle according to the ambient light signal; the dynamic black suppression module is used for performing dynamic black suppression on the image signal according to the vehicle driving environment and determining a corresponding backlight brightness parameter; the source electrode driving module is used for displaying an image adjusting signal; the backlight control module is used for controlling backlight output according to the backlight brightness parameters. The gray value of the black area needing to be blanked is actively set to be 0 in the display chip, so that the source driver does not need to carry out display driving on the black area in the image, and the postcard effect is fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of vehicle HUD technology, specifically to a display driving device and method with dynamic black suppression function. Background Technology

[0002] With the development of the automotive industry, the usage rate of HUD (Head-Up Display) is gradually increasing. HUD technology projects the driving information needed by the driver onto the vehicle's windshield, allowing the driver to check driving information without taking their eyes off the road, thus ensuring the driver's real-time perception of road conditions.

[0003] However, the "postcard effect" is common in automotive LCD HUDs. The "postcard effect" refers to the fact that when the LCD display panel displays black, due to technical limitations, it cannot completely block the light from the backlight, resulting in a small amount of light leakage. In dim environments at night, this light leakage is particularly glaring, thus forming a postcard-shaped projection area on the windshield.

[0004] Furthermore, when driving at night, a driver's pupils naturally dilate to enhance sensitivity to dark environments. However, when the HUD displays images with a black background (such as the night mode of a navigation map), the light leak area does not appear as expected black. Instead, it becomes a uniform, low-brightness gray light panel, resembling a postcard floating on the windshield, creating a stark contrast with the surrounding dim environment. Ultimately, this "postcard effect" leads to direct visual interference, severely hindering the driver's view of the actual road through the windshield, creating continuous visual obstruction, and thus potentially increasing safety hazards. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a display driving device and method with dynamic black suppression function.

[0006] The first aspect of the present invention provides a display driving device with dynamic black suppression function, including an LVDS interface module, an ambient light processing module, a dynamic black suppression module, a backlight control module, and a source driving module; The input of the LVDS interface module is connected to the output of the vehicle SoC chip, and the output is connected to the image signal input of the dynamic black suppression module, which is used to transmit the image signal output by the vehicle SoC chip to the dynamic black suppression module. The ambient light processing module is connected to the ambient light sensor at its input and to the ambient light signal input at its output, which is used to determine the current driving environment of the vehicle based on the ambient light signal and to transmit the current driving environment of the vehicle to the dynamic black suppression module. The output of the dynamic black suppression module is connected to the source drive module and the backlight control module respectively. It is used to perform dynamic black suppression on the image signal according to the vehicle driving environment, output the image adjustment signal after dynamic black suppression to the source drive module, and output the corresponding backlight brightness parameter to the backlight control module. The source drive module is used to display the image adjustment signal and project it onto the HUD projection area of ​​the vehicle windshield. The backlight control module is used to control the backlight output of the HUD projection area according to the backlight brightness parameters output by the dynamic black suppression module.

[0007] Furthermore, the ambient light sensor is disposed around the vehicle to receive external light information from the vehicle and generate an ambient light signal that is transmitted to the ambient light processing module.

[0008] Furthermore, the ambient light processing module determines the vehicle's current driving environment based on the ambient light signal, specifically including the following steps: The ambient light signal is converted into a digital brightness value, and the average brightness value within a preset time window is calculated. Set a daytime brightness threshold and a nighttime brightness threshold, wherein the nighttime brightness threshold is lower than the daytime brightness threshold; When the average brightness value is higher than the daytime brightness threshold, it is determined that the current driving environment of the vehicle is a daytime environment; When the average brightness value is lower than the nighttime brightness threshold, the vehicle's current driving environment is determined to be a nighttime environment.

[0009] Furthermore, the dynamic black suppression module performs dynamic black suppression on the image signal according to the vehicle's driving environment, specifically including the following steps: The image signal input to the LVDS interface module is analyzed pixel by pixel to obtain pixel data; Obtain dimming parameters; the dimming parameters include dimming parameters for daytime environments and dimming parameters for nighttime environments; Based on the vehicle's current driving environment, the dimming parameters for daytime or nighttime environments are called to adjust the grayscale of the pixel data and combine them into an image adjustment signal to be output to the source drive module. Based on the grayscale adjustment result, the corresponding backlight brightness parameter is determined and output to the backlight control module.

[0010] Furthermore, the dimming parameters include threshold parameters and gain parameters; the step of adjusting the grayscale of pixel data by calling the dimming parameters for daytime or nighttime environments according to the current driving environment of the vehicle specifically includes the following steps: Pixels with a gray level lower than the threshold parameter in the pixel data are classified as invalid pixels, and other pixels are classified as valid pixels; Set the grayscale of invalid pixels to 0; compensate the grayscale of valid pixels using the gain parameter to increase their grayscale value.

[0011] Furthermore, the backlight brightness parameter is negatively correlated with the gain parameter; in the step of outputting the corresponding backlight brightness parameter to the backlight control module, the output backlight brightness parameter is determined based on the gain parameter used for compensation.

[0012] Furthermore, when the vehicle's current driving environment changes, the grayscale adjustment of the pixel data is performed through the following steps: A transition curve is generated based on the dimming parameters of the daytime environment and the dimming parameters of the nighttime environment; Within a preset transition time, the pixel data is gradually adjusted using the dimming parameters on the transition curve, so that after the preset transition time, the pixel data can be adjusted using the dimming parameters of the vehicle's current driving environment.

[0013] A second aspect of this invention discloses a dynamic black suppression method, comprising the following steps: Receive ambient light signals and determine the vehicle's current driving environment based on the ambient light signals; The image signal input is acquired, and dynamic black suppression is applied to the image signal according to the vehicle driving environment to obtain the image adjustment signal and generate the corresponding backlight brightness parameters. The image adjustment signal is displayed and projected onto the HUD projection area of ​​the vehicle's windshield; The backlight output of the HUD projection area is controlled according to the backlight brightness parameters.

[0014] Furthermore, the step of dynamically suppressing black in the image signal based on the vehicle's driving environment to obtain an image adjustment signal and generating corresponding backlight brightness parameters specifically includes the following steps: The image signal is analyzed pixel by pixel to obtain pixel data; Obtain dimming parameters; the dimming parameters include dimming parameters for daytime environments and dimming parameters for nighttime environments; Based on the vehicle's current driving environment, the dimming parameters for daytime or nighttime environments are used to adjust the grayscale of pixel data and combine them into an image adjustment signal for output. Based on the grayscale adjustment result, the corresponding backlight brightness parameter is determined and output.

[0015] Furthermore, the dimming parameters include threshold parameters and gain parameters; the step of adjusting the grayscale of pixel data by calling the dimming parameters for daytime or nighttime environments according to the current driving environment of the vehicle specifically includes the following steps: Pixels with a gray level lower than the threshold parameter in the pixel data are classified as invalid pixels, and other pixels are classified as valid pixels; Set the grayscale of invalid pixels to 0; compensate the grayscale of valid pixels using the gain parameter to increase their grayscale value.

[0016] This invention also discloses a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium and execute the computer instructions, causing the computer device to perform the aforementioned method.

[0017] The embodiments of the present invention have the following beneficial effects: In the display driving device and method with dynamic black suppression function of the present invention, by actively setting the grayscale value of the black area to be blanked to 0 inside the display chip, the source driver does not need to drive the display of the black area in the image, thus fundamentally avoiding the postcard effect. At the same time, for the image area to be displayed, the present application coordinates the gain adjustment in the display chip and the backlight brightness adjustment of the backlight control module to maintain the visual brightness of the final projected image at a stable and visible level, without being affected by the blanking of the surrounding black area.

[0018] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the basic structure of a display driving device with dynamic black suppression function according to the present invention; Figure 2 This is a schematic diagram illustrating the implementation principle of dynamic black suppression in the display driving device of the present invention; Figure 3 This is a schematic diagram illustrating the effect of dynamic black suppression achieved by the display driving device of the present invention; Figure 4 This is a schematic diagram of the steps of a dynamic black suppression method according to the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] like Figure 1 As shown, the first embodiment of the present invention provides a display driver device with dynamic black suppression function, including an LVDS interface module, an ambient light processing module, a dynamic black suppression module, a backlight control module, and a source driver module. The LVDS interface module's input is connected to the output of the vehicle's SoC chip, and its output is connected to the image signal input of the dynamic black suppression module, used to transmit the image signal output from the vehicle's SoC chip to the dynamic black suppression module. The ambient light processing module's input is connected to an ambient light sensor, and its output is connected to the ambient light signal input of the dynamic black suppression module, used to determine the vehicle's current driving environment based on the ambient light signal and transmit the current driving environment to the dynamic black suppression module. The dynamic black suppression module's output is connected to both the source driver module and the backlight control module, used to perform dynamic black suppression on the image signal according to the vehicle's driving environment, outputting the dynamically black suppressed image adjustment signal to the source driver module and the corresponding backlight brightness parameter to the backlight control module. The source driver module displays the image adjustment signal and projects it onto the HUD projection area of ​​the vehicle's windshield. The backlight control module controls the backlight output of the HUD projection area according to the backlight brightness parameter output by the dynamic black suppression module.

[0023] The display driving device provided in this embodiment of the invention can effectively eliminate the postcard effect in the HUD projection area and maintain the visibility of the projected content to the maximum extent.

[0024] The implementation principle of dynamic black suppression in the display driving device of this invention is as follows: Figure 2 As shown. The main functional modules of the display driving device of the present invention are described below: Ambient light sensor: In this embodiment of the invention, ambient light sensors installed around the vehicle first detect the light intensity of the external environment. The ambient light sensors in this embodiment can be flexibly selected according to the actual environment and detection accuracy requirements to determine daytime or nighttime lighting conditions, and then transmit the real-time lighting information from outside the vehicle to the ambient light processing module.

[0025] Ambient light processing module: In this embodiment of the invention, the ambient light processing module can determine the vehicle's current driving environment based on the ambient light signal. Specifically, the ambient light processing module determines the vehicle's current driving environment based on the ambient light signal by including the following steps: S101. Convert the ambient light signal into a digital brightness value and calculate the average brightness value within a preset time window; S102. Set the daytime brightness threshold and the nighttime brightness threshold, with the nighttime brightness threshold being lower than the daytime brightness threshold; S103. When the average brightness value is higher than the daytime brightness threshold, the current driving environment of the vehicle is determined to be a daytime environment; S104. When the average brightness value is lower than the nighttime brightness threshold, the vehicle's current driving environment is determined to be a nighttime environment.

[0026] In this embodiment of the invention, the ambient light processing module first performs digital filtering on the received ambient light signal to smooth out spike noise generated by scenarios such as instantaneous vehicle bumps and other vehicle headlights passing over the sensor, obtaining a stable brightness value that reflects the current average ambient light level, which is used as the average brightness value. Then, the average brightness value is compared with a higher daytime brightness threshold and a lower nighttime brightness threshold to determine the vehicle's current driving environment. In this embodiment, the brightness range between the daytime and nighttime brightness thresholds is used as a hysteresis comparison range; the determination of the vehicle's current driving environment is not changed when the average brightness value is within this range. The ambient light processing module determines that the vehicle is in a daytime environment only when the average brightness value is higher than the daytime brightness threshold, and it determines that the vehicle is in a nighttime environment when the average brightness value is lower than the daytime brightness threshold. By setting a hysteresis comparison range between the daytime and nighttime brightness thresholds, this embodiment effectively prevents the ambient light processing module's determination from repeatedly oscillating around the thresholds, thereby affecting the operation of the dynamic black suppression module.

[0027] Preferably, this embodiment of the invention also incorporates a time-window-based moving average method for calculating the average brightness value. For example, the ambient light processing module includes a timer that starts when the average brightness value first meets the switching conditions of a certain driving environment. Only when the average brightness value remains stably within the discrimination range of that driving environment throughout the entire predefined "confirmation time window" (e.g., 0.5 to 2 seconds) will the ambient light processing module finally confirm the state switch and output a new "daytime / nighttime environment" discrimination command to the subsequent dynamic black suppression module. The time-window-based moving average calculation can filter out instantaneous interference such as short-lived bridge shadows or brief high-beam illumination from oncoming vehicles. In other embodiments, the ambient light processing module may also combine other vehicle signals, such as vehicle speed, time information (GPS clock), or rain sensor data, to comprehensively judge the vehicle's driving environment, thereby outputting a more accurate vehicle driving environment discrimination command when facing scenes with gradually changing lighting, such as a cloudy evening.

[0028] LVDS Interface Module: In this embodiment of the invention, the LVDS interface module is a high-speed LVDS interface connecting the host SoC chip and the dynamic black suppression module. It is used to transmit the image signal sent by the host SoC chip at high speed, so that the image signal can be adjusted by DBS (Dynamic Black Suppression) in the dynamic black suppression module.

[0029] Dynamic Black Suppression Module: In this embodiment of the invention, the dynamic black suppression module performs dynamic black suppression on the image signal according to the vehicle driving environment, specifically including the following steps: S201. Perform pixel analysis on the image signal input from the LVDS interface module to obtain pixel data; S202. Obtain dimming parameters; dimming parameters include dimming parameters for daytime environments and dimming parameters for nighttime environments; S203. Based on the current driving environment of the vehicle, call the dimming parameters of the daytime environment or the dimming parameters of the nighttime environment to adjust the grayscale of the pixel data, and combine them into an image adjustment signal to output to the source drive module; S204. Based on the grayscale adjustment result, determine the corresponding backlight brightness parameter and output it to the backlight control module.

[0030] In this embodiment of the invention, the dynamic black suppression module first performs pixel analysis on the image signal to obtain pixel data. Each pixel data obtained has a grayscale value, representing the brightness of that pixel in the image. In this embodiment of the invention, the grayscale value of the background area in the image signal is adjusted so that the background area exhibits a dynamic black suppression effect when projected into a HUD.

[0031] In this embodiment of the invention, the dimming parameters are divided into two groups: daytime environment and nighttime environment. Based on the current driving environment of the vehicle output by the ambient light processing module, the dimming parameters of the daytime environment or the dimming parameters of the nighttime environment are selected and called to adjust the grayscale of the pixel data, and combined into an image adjustment signal and output to the source drive module.

[0032] In this embodiment of the invention, the dimming parameters include a threshold parameter and a gain parameter. The threshold parameter Vth is used to distinguish between the background region (composed of invalid pixels) and the foreground region (composed of valid pixels) in the image signal; the gain parameter Gain is used to enhance the grayscale of the foreground region in the image signal.

[0033] Preferably, in step S203, the pixel data is adjusted for grayscale by calling the dimming parameters for the daytime environment or the dimming parameters for the nighttime environment according to the current driving environment of the vehicle. This specifically includes the following steps: S202-1. Classify pixels in the pixel data whose gray level is lower than the threshold parameter as invalid pixels, and classify other pixels as valid pixels; S202-2. Set the grayscale of invalid pixels to 0; compensate the grayscale of valid pixels using the gain parameter to increase their grayscale value.

[0034] In this embodiment of the invention, the dynamic black suppression module first distinguishes pixel data using a threshold parameter, classifying pixels with grayscale values ​​below the threshold parameter as invalid pixels and other pixels as valid pixels. Preferably, the threshold parameter for daytime environments is higher than that for nighttime environments. After pixel classification, for invalid pixels in the background area, the dynamic black suppression module sets their grayscale values ​​to 0, so that in subsequent display driving, the liquid crystal cells corresponding to these invalid pixels will be completely shut down by applying the maximum voltage (assuming positive liquid crystals), and no pixel output will be generated. Therefore, from the data source, the weak low-grayscale signals passively generated in invalid areas are eliminated, overcoming the digital root cause of the "postcard effect".

[0035] On the other hand, since invalid pixels in the background area are not displayed at all in this embodiment of the invention, the visibility of valid pixels in the foreground area may be reduced. Therefore, the dynamic black suppression module in this embodiment of the invention needs to perform brightness gain compensation on the valid pixels in the foreground area. Specifically, in this embodiment of the invention, for the retained valid pixels (the content to be projected and displayed), their grayscale values ​​are amplified, meaning that in the subsequent gamma voltage conversion of the display driver, they will be mapped to a higher brightness level.

[0036] After these two processing steps, the pixel contrast in the image adjustment signal generated by the dynamic black suppression module is extremely high. The background area consists of completely undisplayed invalid pixels (grayscale data 0), while the foreground area consists of "pre-brightened" valid pixels (grayscale data amplified). Directly projecting the image adjustment signal may result in excessive brightness in the HUD projection area, causing glare and other effects. Therefore, in this embodiment of the invention, the dynamic black suppression module also adjusts the backlight brightness parameters of the backlight control module accordingly, so that the final brightness of the valid pixels remains at the original level.

[0037] Specifically, in this embodiment of the invention, the backlight brightness parameter and the gain parameter are set to have a negative correlation; that is, the higher the gain parameter, the higher the effective pixel grayscale, and the lower the corresponding backlight brightness parameter. By adjusting the backlight brightness parameter and the gain parameter in a coordinated manner, the PWM duty cycle is reduced while the effective pixel brightness of the HUD projection area is increased, thereby reducing the physical brightness of the entire backlight panel.

[0038] The implementation effect of dynamic black suppression in the embodiments of the present invention is as follows: Figure 3 As shown. After DBS processing, for the background area in the image signal, since the grayscale of its pixels is zero, the liquid crystal is completely turned off. At this time, the overall backlight is darkened, so even if there is a small amount of unavoidable hardware light leakage, its absolute brightness is greatly reduced, becoming almost invisible or very weak to the human eye, thus eliminating the "postcard effect". As for the foreground area, although the backlight is darkened, because its pixel grayscale value is pre-enhanced, the product of the two (final light intensity) is maintained, thus ensuring the clear readability of driving information such as text and icons.

[0039] In some embodiments, grayscale adjustment of pixel data is performed when the vehicle's current driving environment changes by the following steps: S301. Generate a transition curve based on the dimming parameters of the daytime environment and the dimming parameters of the nighttime environment; S302. The pixel data is gradually adjusted by applying the dimming parameters on the transition curve within a preset transition time, so that after the preset transition time, the pixel data can be adjusted by applying the dimming parameters of the current driving environment of the vehicle.

[0040] To prevent flickering in the projection area due to instantaneous switching, this embodiment of the invention switches the dynamic black suppression effect between different driving modes by establishing a transition curve. Specifically, the dynamic black suppression module generates a transition curve based on the dimming parameters of the daytime environment and the dimming parameters of the nighttime environment. This transition curve determines the trajectory of pixel data changes over time, and then gradually changes the DBS adjustment effect of the pixel data within a preset transition time. This ensures that after the transition time is completed, the DBS adjustment effect of the pixel data changes to the DBS adjustment effect of the vehicle's current driving environment, which is more in line with the driver's visual perception.

[0041] In summary, the embodiments of the present invention, by actively setting the grayscale value of the black areas to be blanked to 0 within the display chip, eliminate the need for the source driver to drive the display of black areas in the image, fundamentally avoiding the postcard effect. Furthermore, for the image area to be displayed, this application coordinates the gain adjustment in the display chip and the backlight brightness adjustment in the backlight control module to maintain the visual brightness of the final projected image at a stable and visible level, unaffected by the blanking of surrounding black areas.

[0042] The second embodiment of the present invention discloses a dynamic black suppression method, such as... Figure 4 As shown, it includes the following steps: S401. Receive ambient light signals and determine the vehicle's current driving environment based on the ambient light signals; S402. Acquire image signal input, perform dynamic black suppression on the image signal according to the vehicle driving environment, obtain image adjustment signal, and generate corresponding backlight brightness parameters; S403. Display the image adjustment signal and project it onto the HUD projection area of ​​the vehicle's windshield; S404. Control the backlight output of the HUD projection area according to the backlight brightness parameters.

[0043] In some embodiments, step S402 performs dynamic black suppression on the image signal based on the vehicle driving environment to obtain an image adjustment signal and generate corresponding backlight brightness parameters, specifically including the following steps: S402-1. Perform pixel analysis on the image signal to obtain pixel data; S402-2. Obtain dimming parameters; dimming parameters include dimming parameters for daytime environments and dimming parameters for nighttime environments; S402-3. Based on the current driving environment of the vehicle, call the dimming parameters of the daytime environment or the dimming parameters of the nighttime environment to adjust the grayscale of the pixel data, and combine them into an image adjustment signal output; S402-4. Based on the grayscale adjustment result, determine the corresponding backlight brightness parameter output.

[0044] In some embodiments, the dimming parameters include threshold parameters and gain parameters; step S402-2 adjusts the grayscale of the pixel data by calling the dimming parameters for the daytime environment or the dimming parameters for the nighttime environment according to the current driving environment of the vehicle, specifically including the following steps: S402-2-1. Classify pixels in the pixel data whose gray level is lower than the threshold parameter as invalid pixels, and classify other pixels as valid pixels; S402-2-2. Set the grayscale of invalid pixels to 0; compensate the grayscale of valid pixels using the gain parameter to increase their grayscale value.

[0045] The contents of the device in the first embodiment of the present invention are all applicable to the method embodiment. The specific functions implemented in the method embodiment are the same as those in the above device embodiment, and the beneficial effects achieved are also the same as those achieved by the above device.

[0046] Those skilled in the art will understand that modules in the device of the embodiments of the present invention can be adaptively modified and placed in one or more devices different from those embodiments. Modules, units, or components in the embodiments of the present invention can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the corresponding claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the corresponding claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0047] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0048] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0050] In embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of the present invention may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0051] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention. Other embodiments of the present invention will readily conceive of by considering the specification and practicing the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

Claims

1. A display driving device with dynamic black suppression function, characterized in that, It includes an LVDS interface module, an ambient light processing module, a dynamic black suppression module, a backlight control module, and a source driver module; The input of the LVDS interface module is connected to the output of the vehicle SoC chip, and the output is connected to the image signal input of the dynamic black suppression module, which is used to transmit the image signal output by the vehicle SoC chip to the dynamic black suppression module. The ambient light processing module is connected to the ambient light sensor at its input and to the ambient light signal input at its output, which is used to determine the current driving environment of the vehicle based on the ambient light signal and to transmit the current driving environment of the vehicle to the dynamic black suppression module. The output of the dynamic black suppression module is connected to the source drive module and the backlight control module respectively. It is used to perform dynamic black suppression on the image signal according to the vehicle driving environment, output the image adjustment signal after dynamic black suppression to the source drive module, and output the corresponding backlight brightness parameter to the backlight control module. The source drive module is used to display the image adjustment signal and project it onto the HUD projection area of ​​the vehicle windshield. The backlight control module is used to control the backlight output of the HUD projection area according to the backlight brightness parameters output by the dynamic black suppression module.

2. The display driving device with dynamic black suppression function according to claim 1, characterized in that, The ambient light sensor is located around the vehicle to receive external light information from the vehicle and generate an ambient light signal that is transmitted to the ambient light processing module.

3. A display driving device with dynamic black suppression function according to claim 1, characterized in that, The ambient light processing module determines the vehicle's current driving environment based on the ambient light signal, specifically including the following steps: The ambient light signal is converted into a digital brightness value, and the average brightness value within a preset time window is calculated. Set a daytime brightness threshold and a nighttime brightness threshold, wherein the nighttime brightness threshold is lower than the daytime brightness threshold; When the average brightness value is higher than the daytime brightness threshold, it is determined that the current driving environment of the vehicle is a daytime environment; When the average brightness value is lower than the nighttime brightness threshold, the vehicle's current driving environment is determined to be a nighttime environment.

4. A display driving device with dynamic black suppression function according to claim 1, characterized in that, The dynamic black suppression module performs dynamic black suppression on the image signal according to the vehicle's driving environment, specifically including the following steps: The image signal input to the LVDS interface module is analyzed pixel by pixel to obtain pixel data; Obtain dimming parameters; the dimming parameters include dimming parameters for daytime environments and dimming parameters for nighttime environments; Based on the vehicle's current driving environment, the dimming parameters for daytime or nighttime environments are called to adjust the grayscale of the pixel data and combine them into an image adjustment signal to be output to the source drive module. Based on the grayscale adjustment result, the corresponding backlight brightness parameter is determined and output to the backlight control module.

5. A display driving device with dynamic black suppression function according to claim 4, characterized in that, The dimming parameters include threshold parameters and gain parameters; the step of adjusting the grayscale of pixel data by calling the dimming parameters for daytime or nighttime environments according to the current driving environment of the vehicle specifically includes the following steps: Pixels with a gray level lower than the threshold parameter in the pixel data are classified as invalid pixels, and other pixels are classified as valid pixels; Set the grayscale of invalid pixels to 0; compensate the grayscale of valid pixels using the gain parameter to increase their grayscale value.

6. A display driving device with dynamic black suppression function according to claim 5, characterized in that, The backlight brightness parameter is negatively correlated with the gain parameter; in the step of outputting the corresponding backlight brightness parameter to the backlight control module, the output backlight brightness parameter is determined based on the gain parameter used for compensation.

7. A display driving device with dynamic black suppression function according to claim 4, characterized in that, When the vehicle's current driving environment changes, the grayscale adjustment of the pixel data is performed through the following steps: A transition curve is generated based on the dimming parameters of the daytime environment and the dimming parameters of the nighttime environment; Within a preset transition time, the pixel data is gradually adjusted using the dimming parameters on the transition curve, so that after the preset transition time, the pixel data can be adjusted using the dimming parameters of the vehicle's current driving environment.

8. A dynamic black suppression method, characterized in that, Includes the following steps: Receive ambient light signals and determine the vehicle's current driving environment based on the ambient light signals; The image signal input is acquired, and dynamic black suppression is applied to the image signal according to the vehicle driving environment to obtain the image adjustment signal and generate the corresponding backlight brightness parameters. The image adjustment signal is displayed and projected onto the HUD projection area of ​​the vehicle's windshield; The backlight output of the HUD projection area is controlled according to the backlight brightness parameters.

9. The dynamic black suppression method according to claim 8, characterized in that, The process of dynamically suppressing black in the image signal based on the vehicle's driving environment to obtain an image adjustment signal and generate corresponding backlight brightness parameters specifically includes the following steps: The image signal is analyzed pixel by pixel to obtain pixel data; Obtain dimming parameters; the dimming parameters include dimming parameters for daytime environments and dimming parameters for nighttime environments; Based on the vehicle's current driving environment, the dimming parameters for daytime or nighttime environments are used to adjust the grayscale of pixel data and combine them into an image adjustment signal for output. Based on the grayscale adjustment result, the corresponding backlight brightness parameter is determined and output.

10. A dynamic black suppression method according to claim 8, characterized in that, The dimming parameters include threshold parameters and gain parameters; the step of adjusting the grayscale of pixel data by calling the dimming parameters for daytime or nighttime environments according to the current driving environment of the vehicle specifically includes the following steps: Pixels with a gray level lower than the threshold parameter in the pixel data are classified as invalid pixels, and other pixels are classified as valid pixels; Set the grayscale of invalid pixels to 0; compensate the grayscale of valid pixels using the gain parameter to increase their grayscale value.

Images