Regional dynamic brightness control method for backlight light bar of liquid crystal display screen

Abstract

The invention relates to the technical field of liquid crystal display screen brightness adjustment, in particular to a regional dynamic brightness control method for a liquid crystal display screen backlight light bar. The method comprises the following steps of: dividing an image display area of the liquid crystal display screen into a plurality of subareas, and traversing rows and columns of all pixels of the subarea images one by one in horizontal and vertical directions by a single pixel from the upper left corner of the corresponding subarea image by using a large and small sliding window until the lower right corner of the subarea image; calculating to obtain a brightness mean value in a local area contained in the sliding window; calculating a correction coefficient of the backlight light bar based on the brightness mean value in the local area; the initial backlight brightness is adjusted based on the correction coefficient, the brightness of the liquid crystal display screen is adjusted based on the initial backlight brightness, and the backlight brightness of each subarea can be accurately adjusted according to the brightness requirements of different areas in the image content through regional dynamic brightness control.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal display screen brightness adjustment, and in particular to a method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen in different regions. Background Art

[0002] As an important component of modern electronic devices, the display effect and energy consumption of LCD screens have always been the focus of users. Traditional LCD display technology uses global backlight modulation, that is, the backlight brightness of the entire screen is determined by the average brightness of a frame of image. However, this method cannot accurately reflect the brightness details of the local picture in the image content, resulting in limited improvement in image contrast and unsatisfactory image quality.

[0003] In order to overcome this defect, it is urgent to develop a partitioned dynamic backlight modulation technology. This technology divides the entire backlight matrix into multiple partitions, and the backlight brightness of each partition can be driven and controlled separately. In this way, the backlight brightness of each partition can be accurately adjusted according to the brightness requirements of different areas in the image content, thereby greatly improving the image contrast and three-dimensional sense.

[0004] Therefore, there is an urgent need for a method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen in different regions to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method for dynamic brightness control of a liquid crystal display backlight strip by region: to solve the technical problem that traditional liquid crystal display technology cannot accurately reflect the brightness details of local pictures in the image content, resulting in limited improvement in image contrast and poor image quality.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen in different regions, the method comprising:

[0008] The image display area of ​​the LCD screen is divided into several partitions, and the large and small sliding windows are used to start from the upper left corner of the corresponding partition image, and traverse the rows and columns of all pixels of the partition image one by one in the horizontal and vertical directions with a single pixel until the lower right corner of the partition image;

[0009] Calculate the average brightness of the local area contained in the sliding window;

[0010] The correction coefficient of the backlight strip is calculated based on the average brightness in the local area;

[0011] The initial backlight brightness is adjusted based on the correction factor, and the brightness of the liquid crystal display is adjusted based on the initial backlight brightness.

[0012] Furthermore, it is characterized in that calculating the brightness mean value in the local area contained in the sliding window specifically includes the following process:

[0013] For each window position, calculate the sum of the brightness of all pixels within the window;

[0014] Divide the sum of the brightness by the number of pixels in the window to get the mean; where the brightness mean in the local area includes the mean of the local area (i, j) of the (m, n) partition of the input image brightness distribution map X The average brightness of the local area (i, j) of the (m, n) partition of the initial backlight distribution image Y

[0015] Furthermore, it is characterized in that the correction coefficient of the backlight strip is calculated based on the average brightness in the local area and specifically includes the following process:

[0016] The similarity SIM of the brightness distribution of the input image brightness distribution map X and the corresponding initial backlight distribution image Y in the (m, n) partitioned local area (i, j) is calculated based on the brightness mean value in the local area:

[0017]

[0018] Among them, α represents a very small positive constant;

[0019] The correction coefficient S of the backlight strip is calculated based on the similarity of brightness distribution SIM:

[0020]

[0021] Among them, K 1 , K 2 They represent the upper limits of row and column coordinates of the local area of ​​the (m, n) partition respectively.

[0022] Furthermore, it is characterized in that adjusting the initial backlight brightness based on the correction coefficient specifically includes the following process:

[0023] BL cs =BL in *S β ;

[0024] Among them, BL cs represents the initial backlight brightness of the local area of ​​the (m, n) partition, β represents the adjustment factor, which is set by the LCD display, and BL in Represents the initial backlight value of the local area of ​​the (m, n) partition.

[0025] Further, adjusting the brightness of the liquid crystal display screen based on the initial backlight brightness specifically includes the following process:

[0026] L(i, j) = BLcs *F(i, j);

[0027] Wherein, L(i, j) represents the brightness of the local area of ​​the (m, n) partition, and F(i, j) represents the penetration rate of the pixel (i, j).

[0028] Furthermore, the method also includes adjusting the brightness of the liquid crystal display screen by liquid crystal compensation:

[0029]

[0030] Among them, I T (i, j) is the brightness of the liquid crystal image after compensation, I ori (i, j) is the brightness of the original image, BL ful l is the brightness of the backlight when it is fully lit, and γ is the gamma coefficient.

[0031] Furthermore, the liquid crystal display screen used is a touchable liquid crystal display screen.

[0032] Compared with the existing solutions, the present invention achieves the following beneficial effects:

[0033] Precise brightness adjustment: Through regional dynamic brightness control, the backlight brightness of each partition can be accurately adjusted according to the brightness requirements of different areas in the image content. This helps to preserve the details in the image and make the picture clearer and more delicate.

[0034] Enhanced contrast: Since the backlight brightness can be dynamically adjusted according to the image content, the contrast of the image can be significantly improved. The backlight in the dark area is reduced, and the backlight in the bright area is increased, making the contrast between light and dark in the picture more distinct and enhancing the visual impact.

[0035] Reduce visual fatigue: The zone-based dynamic brightness control can automatically adjust the screen brightness according to the ambient light and image content, reducing screen stimulation to the eyes and reducing visual fatigue caused by long-term screen viewing.

[0036] Improve viewing comfort: By optimizing the backlight brightness, the picture can be made softer and more natural, improving the user's viewing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0038] Figure 1It is a working flow chart of a method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen in different regions according to an embodiment of the present invention;

[0039] Figure 2 is a structural diagram of a touchable liquid crystal display screen according to an embodiment of the present invention;

[0040] Figure 3 The present invention is a system block diagram of a sub-region dynamic brightness control system for a backlight strip of a liquid crystal display screen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. may be adopted. In other cases, well-known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0043] This embodiment provides a method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen by region. Figure 1 FIG. 1 is a flowchart of a method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0044] Step S101: Divide the image display area of ​​the LCD screen into several partitions, and use a sliding window of different sizes to start from the upper left corner of the corresponding partition image, and traverse the rows and columns of all pixels of the partition image one by one in the horizontal and vertical directions with a single pixel until the lower right corner of the partition image;

[0045] Step S102: Calculate and obtain the average brightness value in the local area included in the sliding window;

[0046] Step S103: Calculating a correction coefficient of the backlight strip based on the average brightness in the local area;

[0047] Step S104: adjusting the initial backlight brightness based on the correction coefficient, and adjusting the brightness of the liquid crystal display screen based on the initial backlight brightness.

[0048] In summary, the present invention divides the image display area of ​​the liquid crystal display screen into several partitions, uses a sliding window of different sizes to start from the upper left corner of the corresponding partition image, and traverses the rows and columns of all pixels of the partition image one by one in the horizontal and vertical directions with a single pixel until the lower right corner of the partition image; calculates the average brightness in the local area contained in the sliding window; calculates the correction coefficient of the backlight bar based on the average brightness in the local area; adjusts the initial backlight brightness based on the correction coefficient, and adjusts the brightness of the liquid crystal display screen based on the initial backlight brightness, and can accurately adjust the backlight brightness of each partition according to the brightness requirements of different areas in the image content through regional dynamic brightness control, and dynamically adjusts according to the image content, so that the contrast of the image can be significantly improved, the backlight in the dark area is reduced, and the backlight in the bright area is enhanced, so that the light and dark contrast in the picture is more vivid, and the visual impact is enhanced. The regional dynamic brightness control can automatically adjust the screen brightness according to the ambient light and image content, reduce the stimulation of the screen to the eyes, and reduce the visual fatigue caused by watching the screen for a long time.

[0049] In some embodiments, calculating the brightness mean value in the local area included in the sliding window specifically includes the following process:

[0050] For each window position, calculate the sum of the brightness of all pixels within the window;

[0051] Divide the sum of the brightness by the number of pixels in the window to get the mean; where the brightness mean in the local area includes the mean of the local area (i, j) of the (m, n) partition of the input image brightness distribution map X The average brightness of the local area (i, j) of the (m, n) partition of the initial backlight distribution image Y

[0052] In some embodiments, calculating the correction coefficient of the backlight strip based on the average brightness in the local area specifically includes the following process:

[0053] The similarity SIM of the brightness distribution of the input image brightness distribution map X and the corresponding initial backlight distribution image Y in the (m, n) partitioned local area (i, j) is calculated based on the brightness mean value in the local area:

[0054]

[0055] Among them, α represents a very small positive constant;

[0056] The correction coefficient S of the backlight strip is calculated based on the similarity of brightness distribution SIM:

[0057]

[0058] Among them, K 1 , K 2 They represent the upper limits of row and column coordinates of the local area of ​​the (m, n) partition respectively.

[0059] In some embodiments, adjusting the initial backlight brightness based on the correction coefficient specifically includes the following process:

[0060] BL cs =BL in *S β ;

[0061] Among them, BL cs represents the initial backlight brightness of the local area of ​​the (m, n) partition, β represents the adjustment factor, which is set by the LCD display, and BL in Represents the initial backlight value of the local area of ​​the (m, n) partition.

[0062] In some embodiments, adjusting the brightness of the liquid crystal display screen based on the initial backlight brightness specifically includes the following process:

[0063] L(i, j) = BL cs *F(i, j);

[0064] Wherein, L(i, j) represents the brightness of the local area of ​​the (m, n) partition, and F(i, j) represents the penetration rate of the pixel (i, j).

[0065] In some embodiments, the method further includes adjusting the brightness of the liquid crystal display screen by liquid crystal compensation:

[0066]

[0067] Among them, I T (i, j) is the brightness of the liquid crystal image after compensation, I ori (i, j) is the brightness of the original image, BL ful l is the brightness of the backlight when it is fully lit, and γ is the gamma coefficient.

[0068] In some embodiments, the liquid crystal display screen is a touchable liquid crystal display screen. Figure 2 is a structural diagram of a touchable liquid crystal display screen according to an embodiment of the present invention, such as Figure 2 As shown, the touch LCD screen includes a protective glass, a touch screen and a display screen. The three parts need to be laminated, generally twice, one between the protective glass and the touch screen, and the other between the display screen and the touch screen.

[0069] Furthermore, the touchable LCD screen uses On-Cell bonding technology to integrate the touch sensor directly into the surface of the LCD screen. This On-Cell touch screen has high sensitivity, reduces light reflection and scattering, and improves instant response and accurate capture of touch.

[0070] Combined with On-Cell technology, multi-touch and handwriting input support is implemented to achieve a higher level of interactivity. Users can use multiple fingers to perform operations such as zooming, rotating and dragging, as well as natural handwriting input.

[0071] The introduction of gesture recognition algorithms enables the device to intelligently recognize user gestures and respond accordingly. For example, users can use gestures to control screen switching, zooming in and out, rotating, and other operations, providing more interactive methods.

[0072] In some embodiments, the dynamic brightness control method of this example is applied to a sub-region dynamic brightness control system of a backlight strip of a liquid crystal display screen. Figure 3 : is a system block diagram of a sub-region dynamic brightness control system of a liquid crystal display backlight strip according to an embodiment of the present invention, such as Figure 3 As shown, the system includes a display area division module, a brightness mean value calculation module, a correction coefficient calculation module and a brightness adjustment module:

[0073] A display area division module is used to divide the image display area of ​​the LCD screen into several partitions, using a large and small sliding window starting from the upper left corner of the corresponding partition image, and traversing the rows and columns of all pixels of the partition image one by one in the horizontal and vertical directions with a single pixel until the lower right corner of the partition image;

[0074] A brightness mean calculation module is used to calculate the brightness mean in the local area contained in the sliding window;

[0075] A correction coefficient calculation module, used to calculate the correction coefficient of the backlight strip based on the average brightness in the local area;

[0076] The brightness adjustment module is used to adjust the initial backlight brightness based on the correction coefficient, and to adjust the brightness of the liquid crystal display screen based on the initial backlight brightness.

[0077] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0078] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0079] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0080] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only some logical function divisions. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0081] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling the dynamic brightness of a liquid crystal display backlight strip by region, characterized in that: Methods include: The image display area of ​​the LCD screen is divided into several partitions, and the large and small sliding windows are used to start from the upper left corner of the corresponding partition image, and traverse the rows and columns of all pixels of the partition image one by one in the horizontal and vertical directions with a single pixel until the lower right corner of the partition image; Calculate the average brightness of the local area contained in the sliding window; The correction coefficient of the backlight strip is calculated based on the average brightness in the local area; The initial backlight brightness is adjusted based on the correction factor, and the brightness of the liquid crystal display is adjusted based on the initial backlight brightness.

2. The method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen according to claim 1, characterized in that: Calculate the brightness mean value of the local area contained in the sliding window The process includes: For each window position, calculate the sum of the brightness of all pixels within the window; Divide the sum of the brightness by the number of pixels in the window to get the mean; where the brightness mean in the local area includes the mean of the local area (i, j) of the (m, n) partition of the input image brightness distribution map X The average brightness of the local area (i, j) of the (m, n) partition of the initial backlight distribution image Y 3. The method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen according to claim 1, characterized in that: The correction coefficient of the backlight strip is calculated based on the average brightness in the local area. The process includes: The similarity SIM of the brightness distribution of the input image brightness distribution map X and the corresponding initial backlight distribution image Y in the (m, n) partitioned local area (i, j) is calculated based on the brightness mean value in the local area: Among them, α represents a very small positive constant; The correction coefficient S of the backlight strip is calculated based on the similarity of brightness distribution SIM: Among them, K1 and K2 represent the upper limits of the row and column coordinates of the local area of ​​the (m, n) partition respectively.

4. The method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen according to claim 1, characterized in that: Adjust the initial backlight brightness based on the correction factor The process includes: B.L. cs =BL in *S β ; Among them, BL cs represents the initial backlight brightness of the local area of ​​the (m, n) partition, β represents the adjustment factor, which is set by the LCD display, and BL in Represents the initial backlight value of the local area of ​​the (m, n) partition.

5. The method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen according to claim 4, characterized in that: Adjusting the brightness of the LCD screen based on the initial backlight brightness specifically includes the following process: L(i,j)=BL cs *F(i,j); Wherein, L(i, j) represents the brightness of the local area of ​​the (m, n) partition, and F(i, j) represents the penetration rate of the pixel (i, j).

6. The method for controlling the dynamic brightness of a backlight strip of a liquid crystal display screen according to claim 1, characterized in that: The method also includes adjusting the brightness of the liquid crystal display screen by liquid crystal compensation: Among them, I T (i, j) is the brightness of the liquid crystal image after compensation, I ori (i, j) is the brightness of the original image, BL full is the brightness of the backlight when it is fully lit, and γ is the gamma coefficient.

7. The method for controlling the dynamic brightness of a liquid crystal display backlight strip by region according to claim 1, characterized in that: The LCD screen used is a touchable LCD screen.

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