Display device and method of controlling display

Abstract

The application provides a display device and a display control method. The display device comprises a mainboard, a screen driving board and a display screen. The mainboard obtains a refresh rate corresponding to video data to be displayed, and determines a pixel adjustment coefficient according to the refresh rate. Each frame of video data corresponding to the refresh rate is processed according to the pixel adjustment coefficient, and the processed video data is output to the screen driving board through the mainboard, so that the screen driving board drives the display screen to display the video data, thereby adjusting the display brightness stability of the display screen and avoiding the display picture being bright and dark suddenly.

Description

Technical Field

[0001] This invention relates to electronic technology, and more particularly to a display device and a method for controlling the display. Background Technology

[0002] With the development of technology, users have increasingly higher requirements for the display effects of display devices, such as the smoothness of display. Since the frame rate of the graphics processing unit (GPU) is not constant during the rendering of images, display devices need to set a variable refresh rate (VRR) to match the changes in the GPU's frame rate, so as to make the content displayed on the display device smoother.

[0003] However, changes in the screen's refresh rate can cause variations in the screen's brightness, resulting in flickering brightness during display and negatively impacting the user experience. Summary of the Invention

[0004] This application provides a display device and a display control method, which solves the problem of brightness variation caused by changes in refresh rate.

[0005] In a first aspect, embodiments of this application provide a display device, including: a motherboard, a screen driver board, and a display screen;

[0006] The screen driver board is connected between the motherboard and the display screen;

[0007] The motherboard is used for:

[0008] Get the refresh rate corresponding to the video data to be displayed;

[0009] A set of gamma voltages is determined based on the refresh rate, and the set of gamma voltages is sent to the screen driver board. The set of gamma voltages is used to enable the screen driver board to map the received display signal to obtain a screen driver signal that drives the display screen to display the video data.

[0010] Secondly, embodiments of this application provide a display control method, including:

[0011] Get the refresh rate corresponding to the video data to be displayed;

[0012] A set of gamma voltages is determined based on the refresh rate, and the set of gamma voltages is sent to the screen driver board. The set of gamma voltages is used to enable the screen driver board to map the received display signal to obtain a screen driver signal that drives the display screen to display the video data.

[0013] Thirdly, embodiments of this application provide a display device, including a motherboard, a screen driver board, and a display screen;

[0014] The screen driver board is connected between the motherboard and the display screen;

[0015] The motherboard is configured as follows:

[0016] Get the refresh rate corresponding to the video data to be displayed;

[0017] The pixel adjustment coefficient is determined based on the refresh rate;

[0018] Pixel processing is performed on each frame of video data corresponding to the refresh rate based on the pixel adjustment coefficient.

[0019] The processed video data is output to the screen driver board, which then drives the display screen to display the video data.

[0020] Fourthly, embodiments of this application provide a display control method, including: acquiring the refresh rate corresponding to the video data to be displayed;

[0021] The pixel adjustment coefficient is determined based on the refresh rate;

[0022] Pixel processing is performed on each frame of video data corresponding to the refresh rate based on the pixel adjustment coefficient.

[0023] The processed video data is output to the screen driver board, which then drives the display screen to display the video data.

[0024] Fifthly, embodiments of this application provide a display device, including: a motherboard, a power board, and a display screen;

[0025] The motherboard is connected to both the power supply board and the display screen, and the power supply board is connected to the display screen.

[0026] The motherboard is configured to: acquire the refresh rate corresponding to the video data to be displayed, and generate a backlight control signal according to the refresh rate, wherein the duty cycle of the backlight control signal is different for different refresh rates;

[0027] The power board is configured to receive the backlight control signal and drive the backlight source of the display screen according to the backlight control signal.

[0028] Sixthly, embodiments of this application provide a display control method, including:

[0029] Get the refresh rate corresponding to the video data to be displayed;

[0030] A backlight control signal is generated based on the refresh rate; wherein, the duty cycle of the backlight control signal is different for different refresh rates, and the backlight control signal is used to drive the backlight source of the display screen.

[0031] The display device and display control method provided in this application embodiment acquire the refresh rate corresponding to the video data to be displayed in real time, and dynamically determine the display parameters based on the refresh rate. The display parameters include, but are not limited to, at least one of gamma voltage, pixel adjustment coefficient, backlight brightness, etc. The display screen is then controlled to display the video data based on the display parameters, so as to adjust the brightness of the screen to be stable and avoid the display screen from being bright and dark. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the display cycle of a liquid crystal display screen provided in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0037] Figure 5 A schematic diagram of a gamma curve provided for an embodiment of this application;

[0038] Figure 6 A flowchart illustrating a display control method provided in an embodiment of this application;

[0039] Figure 7 A schematic diagram illustrating the relationship between display cycle and light transmittance, provided for an embodiment of this application;

[0040] Figure 8 A schematic diagram illustrating a reduction in Gamma voltage provided in an embodiment of this application;

[0041] Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0042] Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0043] Figure 11 A flowchart illustrating a display control method provided in an embodiment of this application;

[0044] Figure 12 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0045] Figure 13 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0046] Figure 14 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0047] Figure 15 This is a flowchart illustrating a display control method provided in an embodiment of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] Currently, display devices can use Variable Refresh Rate (VRR) display protocols, such as G-Sync and FreeSync, to set different refresh rates to adapt to changes in the frame rate of the Graphics Processing Unit (GPU), making the displayed content smoother. These display devices can be any terminal device with a display screen, such as televisions, computers, smart displays, all-in-one PCs, mobile phones, and laptops. Taking an LCD screen as an example, changes in the refresh rate of the display device cause a change in the proportion of liquid crystal molecule flipping time to the total display cycle time, resulting in a change in the average light transmittance of the display screen per unit time, and consequently, a change in display brightness.

[0050] Figure 1 This is a schematic diagram illustrating the display cycle of a liquid crystal display screen provided in an embodiment of this application. The display process of the liquid crystal display screen is divided into two parts: a response process and a display process. (In conjunction with...) Figure 1As shown, the horizontal axis is the time axis (t), and the vertical axis is the light transmittance axis (h). Here, tr1 or tr2 represents the response time corresponding to the response process, i.e., the time required for the liquid crystal molecules to rotate to the specified state; ton represents the display time corresponding to the display process, i.e., the time it takes for the liquid crystal molecules to rotate to the specified state and then display normally. Figure 1 The figure shows the change in light transmittance of the liquid crystal display screen under two refresh rates. Refresh rate a is less than refresh rate b. Therefore, the display cycle of the liquid crystal display screen is shorter under refresh rate b. Under the same liquid crystal driving conditions, the response time of the liquid crystal molecules is basically the same, that is, tr1 equals tr2. Therefore, the display cycle under refresh rate b is less than the display cycle under refresh rate a, which will shorten the display time ton, that is, ton2 is less than ton1.

[0051] As can be seen, the higher the refresh rate, the dimmer the LCD screen; conversely, the lower the refresh rate, the brighter the LCD screen. With changes in refresh rate, the displayed image on the LCD screen will exhibit flickering brightness. This application's embodiments can address the aforementioned scenario by determining different display parameters based on the refresh rate. The display device then displays according to these different parameters to maintain stable display brightness and prevent flickering. These display parameters include, but are not limited to, at least one of gamma voltage, pixel adjustment coefficient, and backlight brightness.

[0052] In order to maintain the stability of the display brightness during the display process, the embodiments of this application obtain the refresh rate corresponding to the video data to be displayed in real time, dynamically determine the display parameters according to the refresh rate, and then control the display screen to display the video data according to the display parameters, so as to adjust the brightness of the image displayed on the display screen to be stable.

[0053] The embodiments of this application include at least the following three possible implementation methods.

[0054] Method 1: Dynamically adjust the gamma voltage to change the average light transmittance of the liquid crystal molecules;

[0055] Method 2: Dynamically adjust the pixel values ​​of the video data, enlarging or compressing the pixel values;

[0056] Method 3: Dynamically adjust the backlight brightness to compensate for or suppress the display brightness of the screen.

[0057] Method 1:

[0058] Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 2 As shown, the display device 001 includes a motherboard 100, a screen driver board 200, and a display screen 300. The screen driver board 200 is connected between the motherboard 100 and the display screen 300.

[0059] The motherboard 100 is used to obtain the refresh rate corresponding to the video data to be displayed, and determines a set of gamma voltages based on the refresh rate, and then sends the set of gamma voltages to the screen driver board 200. Among them, the set of gamma voltages is used to enable the screen driver board 200 to map the received display signal to obtain the screen drive signal that drives the display screen 300 to display the video data.

[0060] The screen driver board 200 generates a screen driving signal based on a set of gamma voltages and the received display signal, and sends the screen driving signal to the display screen 300, so that the display screen 300 displays video data according to the screen driving signal.

[0061] Figure 3 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 3 As shown, the motherboard 100 includes at least: a refresh rate monitoring unit 120 and a gamma voltage processing unit 130.

[0062] like Figure 3 As shown, for example, the refresh rate monitoring unit 120 acquires the field synchronization signal of the video data to be displayed. Each frame of video data corresponds to one field synchronization signal, and the field synchronization signal carries the refresh rate corresponding to that video frame. For example, the field synchronization signal is sent before the corresponding video frame.

[0063] For example, the motherboard 100 also includes a video data acquisition unit 110, which is used to acquire video data to be displayed from the video data source 002 and to perform decoding and other processing on the video data. Optionally, the refresh rate monitoring unit 120 acquires the field synchronization signal of the video data to be displayed from the video data acquisition unit 110.

[0064] The video data source 002 can be a server, storage medium, image acquisition device, High Definition Multimedia Interface (HDMI) channel, etc.

[0065] For example, video data source 002 first sends video data to GPU (not shown in the figure), enabling GPU to render the video data and generate a field synchronization signal. Refresh rate monitoring unit 120 obtains the field synchronization signal and the rendered video data from the GPU. Optionally, the GPU can be located on the graphics card or on the motherboard. Optionally, the graphics card can be independent of the motherboard or integrated on the motherboard.

[0066] The refresh rate monitoring unit 120 sends the acquired refresh rate to the gamma voltage processing unit 130. The gamma voltage processing unit 130 determines a set of gamma voltages based on the refresh rate and sends the set of gamma voltages to the screen driver board 200. The set of gamma voltages includes multiple gamma voltages required by the screen driver board 200 to map the display signal; for example, the number of gamma voltages can be 12.

[0067] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 4 As shown, exemplarily, the gamma voltage processing unit 130 includes: a gamma voltage coefficient confirmation subunit 131 and a gamma voltage adjustment subunit 132.

[0068] The gamma voltage coefficient confirmation subunit 131 calculates the adjustment coefficient of the gamma voltage according to the refresh rate; the gamma voltage adjustment subunit 132 adjusts a set of default gamma voltages according to the adjustment coefficient to obtain the set of gamma voltages; the set of default gamma voltages is a set of gamma voltages preset for the default refresh rate.

[0069] Specifically, the video data acquisition unit 110, the refresh rate monitoring unit 120, and the gamma voltage processing unit 130 can be located in the system-on-a-chip (SOC) of the motherboard.

[0070] The screen driver board 200 generates a gamma curve based on the received multiple gamma voltages, maps the received display signals according to the gamma curve to obtain the screen driver signal, and then drives the display screen 300 to display video data according to the screen driver signal. The display signal can be a signal conforming to any image transmission protocol, such as VByOne signal, Low-Voltage Differential Signaling (LVDS) signal, etc.

[0071] Figure 5 This is a schematic diagram of a gamma curve provided in an embodiment of this application. For example, the gamma voltage processing unit 130 sends 12 gamma voltages V1 to V12 to the screen driver board 200, and the screen driver board 200 generates a graph based on the gamma voltages V1 to V12. Figure 5 The gamma curve shown is located in a two-dimensional coordinate system where the horizontal axis represents image data values ​​and the vertical axis represents voltage values. It should be understood that V6 equals V7, and is equal to the reference voltage Vcom for liquid crystal molecule deflection. Furthermore, the screen driver board 200 maps the voltage values ​​of the received display signals onto the generated gamma curve to obtain the image data value corresponding to each display signal (image data values ​​are generally between 0 and 255). Based on this image data value, it generates a screen drive signal to drive the display screen 300 to display the corresponding video data.

[0072] It should be understood that different gamma curves will cause the display signal to map different image data values. When the refresh rate increases, the gamma voltage processing unit 130 should output a larger gamma voltage. Based on the gamma curve generated by the increased gamma voltage, the mapped image data value is lower, thus resulting in higher brightness. Conversely, outputting a smaller gamma voltage from the gamma voltage processing unit 130 can reduce the display brightness.

[0073] Generally speaking, different refresh rates correspond to different sets of gamma voltages, that is, refresh rates correspond one-to-one with a set of gamma voltages; or, multiple refresh rates correspond to a set of gamma voltages, such as multiple refresh rates with adjacent values.

[0074] For example, the display device 001 may also include a Gamma chip (Integrated Circuit Chip, IC) (not shown in the figure). This Gamma IC may be mounted on the motherboard or on the screen driver board; this application does not require it to be mounted thereon. For example, the Gamma IC and the gamma processing unit can be connected via an Inter-Integrated Circuit (IIC) interface. The Gamma IC and screen driver board can be connected via multiple input / output I / O ports. The bus receives a set of gamma voltage values ​​sent by the gamma processing unit, and converts each gamma voltage value into a voltage and sends it to the screen driver board 200 through multiple I / O ports.

[0075] In the display device 001 provided in this application embodiment, the refresh rate monitoring unit 120 obtains the refresh rate corresponding to the video data to be displayed in real time, and the gamma voltage processing unit 130 adjusts the magnitude of a set of gamma voltages in real time according to the refresh rate. Then, the screen driver board 200 generates a gamma curve based on the set of gamma voltages, thereby changing the mapping result of the display signal in the gamma curve, realizing the adjustment of the display brightness, and avoiding the problem of the display screen flickering.

[0076] This application also provides a display control method, which is applied to the display device 001 provided in any of the above embodiments.

[0077] Figure 6 This is a flowchart illustrating a display control method provided in an embodiment of this application. Figure 6 As shown, the method includes:

[0078] S101: Get the refresh rate corresponding to the video data to be displayed.

[0079] S102: Determine a set of gamma voltages based on the refresh rate.

[0080] In this step, in order to control the gamma voltage to adapt to changes in refresh rate, the gamma voltage processing unit 130 determines a set of gamma voltages in real time according to the refresh rate. This application embodiment provides the following three possible implementation methods for this:

[0081] First, based on the refresh rate, calculate the adjustment coefficient for the gamma voltage, and then adjust multiple sets of default gamma voltages according to the adjustment coefficient to obtain a set of gamma voltages. This set of default gamma voltages is a preset set of gamma voltages for the default refresh rate. Generally, the default refresh rate is the fixed refresh rate of the display device when VRR is not set.

[0082] Figure 7 This diagram illustrates the relationship between display cycle and light transmittance, as provided in an embodiment of this application. To ensure a consistently stable display brightness, it is necessary to maintain a stable average light transmittance of the display screen, meaning that the average light transmittance of the display screen must remain constant at any refresh rate. Based on the above reasons, combined with... Figure 7 As shown, the relationship between refresh rate F and display time ton can be expressed by formula (1) ton=1 / F-tr, where tr is the response time of the display screen; the average light transmittance at the default refresh rate can be expressed by formula (2). =ton H+tr H / 2 means that H is the highest light transmittance at the refresh rate obtained in real time.

[0083] Based on formulas (1) and (2), we can derive... Since H is positively correlated with gamma voltage, the adjustment coefficient can be derived. .

[0084] Furthermore, the difference between each default gamma voltage and the reference voltage Vcom is calculated to obtain the difference value. Then, the difference value is multiplied by an adjustment factor and summed with the reference voltage Vcom. This process amplifies or reduces the default gamma voltage to obtain the final set of gamma voltages.

[0085] Figure 8 This diagram illustrates a Gamma voltage reduction method provided in an embodiment of this application. When the adjustment coefficient K is less than 1, a set of default gamma voltages is reduced, for example... Figure 8 The position shown is reduced from the solid line to the position indicated by the dashed line.

[0086] 2. Determine a set of gamma voltages based on the correspondence between the refresh rate and the preset refresh rate and gamma voltage.

[0087] In this implementation, the gamma voltage at different refresh rates needs to be obtained in advance using experimental data. For example, with the displayed content unchanged, such as displaying pure white content, the refresh rate is continuously changed. Each time the refresh rate is changed, a set of default gamma voltages is adjusted to ensure the display brightness at that refresh rate matches the brightness at the default refresh rate. The adjusted set of gamma voltages is then used as the gamma voltage corresponding to that refresh rate, thereby determining the gamma voltage corresponding to each different refresh rate. In this embodiment, because the gamma voltage corresponding to each refresh rate is determined in advance, the calculation process is simplified, and the processing efficiency of the gamma voltage processing unit 130 is improved.

[0088] 3. Based on the correspondence between the refresh rate and the preset refresh rate and the offset of the gamma voltage, determine a set of gamma voltage offsets; and based on a set of gamma voltage offsets and a set of default gamma voltages, calculate a set of gamma voltages.

[0089] Similar to implementation method two, it is necessary to obtain the offset of gamma voltage at different refresh rates in advance using experimental data. For example, with the displayed content unchanged, such as displaying pure white content, the refresh rate is continuously changed. Each time the refresh rate is changed, a set of default gamma voltages is adjusted to ensure the display brightness at that refresh rate matches the brightness at the default refresh rate. The offset adjusted when using the default gamma voltages is then used as the offset of a set of gamma voltages corresponding to that refresh rate. This determines the offset of a set of gamma voltages for each different refresh rate. It should be understood that the offsets of a set of gamma voltages can be the same or different; this solution does not require this. If all the offsets of a set of gamma voltages are the same, the data volume of the correspondence between refresh rate and gamma voltage offsets is smaller, saving storage space.

[0090] Furthermore, based on a set of gamma voltage offsets and a set of default gamma voltages, a final set of gamma voltages can be calculated.

[0091] S103: Sends a set of gamma voltages to the screen driver board.

[0092] In this step, a set of gamma voltages is sent to the screen driver board, which then drives the display screen to display video data based on the set of gamma voltages and the received display signal.

[0093] In this embodiment, the refresh rate corresponding to the video data to be displayed is obtained in real time, and the magnitude of a set of gamma voltages is adjusted in real time according to the refresh rate. Then, a gamma curve is generated according to the set of gamma voltages, thereby changing the mapping result of the display signal in the gamma curve, so as to adjust the display brightness and avoid the problem of the display screen flickering.

[0094] Method 2:

[0095] Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 9 As shown, the display device 003 includes a motherboard 400, a screen driver board 500, and a display screen 600. The screen driver board 500 is connected between the motherboard 400 and the display screen 600.

[0096] The motherboard 400 is used to obtain the refresh rate corresponding to the video data to be displayed, determine the pixel adjustment coefficient based on the refresh rate, perform pixel processing on each frame of video data corresponding to the refresh rate based on the pixel adjustment coefficient, and then output the processed video data to the screen driver board.

[0097] The screen driver board 500 drives the display screen 600 to display the processed video data.

[0098] Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 10 As shown, for example, the motherboard 400 includes at least: a refresh rate monitoring unit 420, an adjustment coefficient determination unit 430, an image processing unit 440, and a video output unit 450.

[0099] For example, the motherboard 400 also includes a video data acquisition unit 410, which is used to acquire video data to be displayed from the video data source 002 and to perform decoding and other processing on the video data.

[0100] In this embodiment, the video data source 002, the video data acquisition unit 410, and the refresh rate monitoring unit 420 are all the same as the corresponding contents in the aforementioned embodiments, and will not be repeated here.

[0101] The refresh rate monitoring unit 420 sends the acquired refresh rate to the adjustment coefficient determination unit 430. The adjustment coefficient determination unit 430 determines the pixel adjustment coefficient in real time based on the refresh rate and sends the pixel adjustment coefficient matching the refresh rate to the image processing unit 440.

[0102] The image processing unit 440 receives the pixel adjustment coefficients sent by the adjustment coefficient determination unit 430, and acquires video data from the video data acquisition unit 410. Based on the pixel adjustment coefficients, the image processing unit 440 performs pixel processing on each frame of video data corresponding to the acquired refresh rate. It should be understood that at a lower refresh rate, the display brightness is higher, so pixel values ​​need to be enlarged to reduce display brightness; conversely, at a higher refresh rate, the display brightness is lower, so pixel values ​​need to be compressed to increase display brightness.

[0103] The video output unit 450 outputs the pixel-processed video data to the screen driver board 500, causing the screen driver board 500 to generate a drive signal, and then drive the display screen to display the video data through the drive signal.

[0104] For example, the video data acquisition unit 410, refresh rate monitoring unit 420, adjustment coefficient determination unit 430, image processing unit 440 and video output unit 450 can all be set in the SOC of the motherboard.

[0105] In the display device 003 provided in this application embodiment, the refresh rate monitoring unit 420 obtains the refresh rate corresponding to the video data to be displayed in real time, and the adjustment coefficient determination unit 430 determines the pixel adjustment coefficient according to the refresh rate. Then, the image processing unit 440 performs pixel processing on the video data to be displayed according to the pixel adjustment coefficient, enlarging or compressing the size of the pixel value to adjust the display brightness, so that the display brightness of the video data finally displayed on the screen is stable.

[0106] This application also provides a display control method, which is applied to the display device 003 provided in any of the above embodiments.

[0107] Figure 11 This is a flowchart illustrating a display control method provided in an embodiment of this application. Figure 11 As shown, the method includes:

[0108] S201: Obtain the refresh rate corresponding to the video data to be displayed.

[0109] S202: Determine the pixel adjustment coefficient based on the refresh rate.

[0110] In this embodiment of the application, different pixel adjustment coefficients are determined for different refresh rates to achieve pixel processing for each video frame, resulting in stable display brightness for the final displayed video data. This step provides the following two possible implementation methods for determining the pixel adjustment coefficients.

[0111] I. Based on the refresh rate F and the formula The maximum light transmittance H corresponding to the refresh rate F is calculated, and the maximum light transmittance H is compared with the maximum light transmittance corresponding to the default refresh rate. The ratio of is used as the pixel adjustment coefficient K. Wherein, tr represents the average light transmittance at the default refresh rate, and tr represents the display's response time.

[0112] formula The derivation process and Figure 7 The derivation process for the illustrated embodiment is the same and will not be repeated here.

[0113] 2. Determine the pixel adjustment coefficient based on the correspondence between the refresh rate and the preset refresh rate and the pixel adjustment coefficient.

[0114] In this implementation, pixel adjustment coefficients for different refresh rates need to be obtained in advance using experimental data. For example, with the displayed content unchanged, such as displaying a pure white image, the refresh rate is continuously changed. Each time the refresh rate is changed, the pixel values ​​of the video frames are adjusted proportionally to ensure the display brightness at that refresh rate matches the brightness at the default refresh rate. This adjustment ratio is then used as the pixel adjustment coefficient to determine the pixel adjustment coefficient for each different refresh rate. In this embodiment, by establishing a pre-established correspondence between refresh rate and pixel adjustment coefficient and determining the corresponding pixel adjustment coefficient in real time based on the refresh rate, errors caused by formula calculations are avoided, improving the accuracy of display brightness adjustment.

[0115] S203: Perform pixel processing on each frame of video data corresponding to the refresh rate based on the pixel adjustment coefficient.

[0116] For example, the pixel value of each pixel in each frame of video data corresponding to the refresh rate is multiplied by the pixel adjustment factor to obtain the processed video data.

[0117] For example, if the pixel adjustment factor is (Kr, Kg, Kb), and the pixel value of a certain pixel is (200, 100, 200), then multiplying the two values ​​together will give (200). Kr, 100 Kg, 200 Kb). Among them, Kr, Kg and Kb can be the same or different, and this scheme does not require them to be.

[0118] S204: Output the processed video data to the screen driver board, so that the screen driver board drives the display screen to display the video data.

[0119] In this embodiment, the refresh rate corresponding to the video data to be displayed is obtained in real time, and the pixel adjustment coefficient is determined according to the refresh rate. Then, the pixel data to be displayed is processed according to the pixel adjustment coefficient to enlarge or compress the size of the pixel value, thereby adjusting the display brightness and making the display brightness of the video data finally displayed on the screen stable.

[0120] Method 3:

[0121] Figure 12 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 12As shown, the display device 004 includes a motherboard 700, a power board 800, and a display screen 900. The motherboard 700 is connected to both the power board 800 and the display screen 900, and the power board 800 is also connected to the display screen 900. For example, the power board 800 is connected to the backlight source of the display screen 900.

[0122] The motherboard 700 is used to obtain the refresh rate corresponding to the video data to be displayed, and generates a backlight control signal based on the refresh rate, and then sends the backlight control signal to the power board 800.

[0123] The power board 800 drives the backlight source of the display screen 900 according to the received backlight control signal. The backlight control signal has different characteristics for different refresh rates, including the duty cycle.

[0124] Figure 13 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 13 As shown, the motherboard 700 includes at least: a refresh rate monitoring unit 720 and a backlight adjustment unit 730. The power supply board 800 includes: a backlight driver unit 810.

[0125] For example, the motherboard 700 also includes a video data acquisition unit 710, which is used to acquire video data to be displayed from the video data source 002 and to perform decoding and other processing on the video data.

[0126] In this embodiment, the video data source 002, the video data acquisition unit 710, and the refresh rate monitoring unit 720 are all the same as the corresponding contents in the aforementioned embodiments, and will not be repeated here.

[0127] The refresh rate monitoring unit 720 sends the acquired refresh rate to the backlight adjustment unit 730. The backlight adjustment unit 730 determines the backlight brightness in real time based on the refresh rate, adjusts the backlight control signal, and sends the backlight control signal to the backlight driving unit 810.

[0128] For example, the backlight control signal can be a signal that satisfies any transmission protocol, such as a pulse width modulation (PWM) signal. Signals, Serial Peripheral Interface (SPI) signals, etc.

[0129] For example, different refresh rates correspond to different backlight brightness. In order to achieve the required backlight brightness, the backlight adjustment unit 730 needs to adjust the duty cycle of the backlight control signal. It should be understood that the higher the duty cycle of the backlight control signal, the longer the backlight source is driven to light up, and the higher the backlight brightness perceived by the human eye; conversely, the lower the duty cycle of the backlight control signal, the lower the backlight brightness.

[0130] Figure 14 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 14 As shown, exemplarily, the backlight adjustment unit 730 includes: an adjustment coefficient determination subunit 731 and a signal adjustment subunit 732.

[0131] The adjustment coefficient determination subunit 731 determines the adjustment coefficient based on the refresh rate; the signal adjustment subunit 732 adjusts the duty cycle of the default backlight control signal based on the adjustment coefficient, and generates a backlight control signal corresponding to the refresh rate based on the adjusted duty cycle, wherein the default backlight control signal is a preset control signal for the default refresh rate.

[0132] The backlight driving unit 810 drives the backlight of the display screen to the required backlight brightness according to the backlight control signal, so as to compensate for the darker display brightness when the refresh rate is high, or suppress the brighter display brightness when the refresh rate is low.

[0133] In one specific implementation, the motherboard 700 further includes an image processing unit 740 and a video output unit 750. The image processing unit 740 acquires video data from the video data acquisition unit 710, performs rendering processing on the video data (e.g., image quality optimization), and then sends the processed video data to the video output unit 750. The video output unit 750 sends the video data to the display screen for display. For example, the video output unit 750 sends the video data to the screen driver board (not shown in the figure) via a display signal. The screen driver board generates a screen driving signal and sends it to the display screen 900 to drive the display screen 900 to display the corresponding video data.

[0134] In the display device 004 provided in this embodiment, the refresh rate monitoring unit 720 acquires the refresh rate corresponding to the video data to be displayed in real time, and the backlight adjustment unit 730 adjusts the backlight control signal according to the refresh rate. Then, the backlight driving unit 810 drives the backlight of the display screen to achieve the required backlight brightness according to the backlight control signal. This embodiment compensates for or suppresses the display brightness of the screen by adjusting the backlight brightness, so that the display brightness of the screen remains stable.

[0135] Figure 15 This is a flowchart illustrating a display control method provided in an embodiment of this application. Figure 15 As shown, the method includes:

[0136] S301: Get the refresh rate corresponding to the video data to be displayed.

[0137] S302: Generates backlight control signals based on the refresh rate.

[0138] In this step, to adaptively control the backlight brightness as the refresh rate changes, the backlight adjustment unit 730 generates a backlight control signal corresponding to the refresh rate in real time. It should be understood that this backlight control signal has a duty cycle corresponding to the refresh rate. For example, an adjustment coefficient is determined based on the refresh rate, and the duty cycle of the default backlight control signal is adjusted according to the adjustment coefficient to obtain the backlight control signal corresponding to the refresh rate. The default backlight control signal is a preset control signal for the default refresh rate.

[0139] This application provides the following two possible implementation methods for determining the adjustment coefficient based on the refresh rate:

[0140] I. Based on the refresh rate F and the formula The adjustment coefficient K is calculated.

[0141] in, Here, tr represents the average light transmittance corresponding to the default refresh rate, tr represents the response time of the display screen, and A is a preset coefficient. Optionally, A is generally a value greater than 0 and less than 2.

[0142] It should be understood that the maximum light transmittance H is directly proportional to the required adjustment of the backlight brightness, therefore, according to the formula... Able to derive formula And the formula The derivation process and Figure 7 The derivation process for the illustrated embodiment is the same and will not be repeated here.

[0143] 2. Determine the adjustment coefficient based on the correspondence between the refresh rate and the preset refresh rate and the adjustment coefficient.

[0144] In this implementation, it is necessary to obtain the pixel adjustment coefficients for different refresh rates in advance using experimental data. For example, with the displayed content remaining unchanged, such as displaying a pure white image or other grayscale images, the refresh rate is continuously changed. Each time the refresh rate is changed, the duty cycle of the backlight drive signal is adjusted to make the display brightness at that refresh rate consistent with the display brightness at the default refresh rate. The ratio of the adjusted duty cycle of the backlight control signal to the duty cycle of the backlight control signal at the default refresh rate is then used as the adjustment coefficient corresponding to that refresh rate.

[0145] Furthermore, the adjustment coefficient corresponding to the real-time refresh rate is multiplied by the duty cycle of the default backlight control signal to obtain the duty cycle of the backlight control signal corresponding to the refresh rate. The duty cycle of the default backlight control signal is then adjusted to the required duty cycle of the backlight control signal, and the backlight drive signal is then output to the backlight drive unit 810.

[0146] Let's take a PWM signal as an example to illustrate this. For a specific video frame, assuming a default refresh rate of 60Hz, the duty cycle of the PWM signal is PWM1 = 15%. By comparing the correspondence between refresh rate and backlight control signal, we know that at a refresh rate of 120Hz, the adjustment coefficient K = 2. Therefore, the duty cycle of the PWM signal should be set to PWM2. K=30%.

[0147] S303: Drives the backlight source of the display screen according to the backlight control signal.

[0148] In this embodiment, by acquiring the refresh rate corresponding to the video data to be displayed in real time, generating a backlight control signal based on the refresh rate, and then driving the backlight source of the display screen to reach the required backlight brightness based on the backlight control signal, the display brightness of the display screen is compensated or suppressed by adjusting the backlight brightness, so that the display brightness of the display screen remains stable.

[0149] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0150] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method of display, characterized by, The method comprises the following steps: acquiring a refresh rate corresponding to video data to be displayed; According to the refresh rate F and the formula , the highest light transmittance H corresponding to the refresh rate F is calculated. The highest light transmittance H is compared with the highest light transmittance corresponding to the default refresh rate. The ratio is used as the pixel adjustment coefficient K; wherein, is the average light transmittance corresponding to the default refresh rate, and tr is the response time of the display screen. performing pixel processing on each frame of video data corresponding to the refresh rate according to a pixel adjustment coefficient; outputting the processed video data to a screen driving board, so that the screen driving board drives a display screen to display the video data.

2. The method of claim 1, wherein, The pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient comprises the following steps: multiplying a pixel value of each pixel point in each frame of video data corresponding to the refresh rate by the pixel adjustment coefficient.

3. A display device, characterized by comprising: The device comprises a main board, a screen driving board and a display screen. The screen driving board is connected between the main board and the display screen. The main board comprises: a refresh rate monitoring unit configured to acquire a refresh rate corresponding to video data to be displayed; a coefficient adjustment unit configured to calculate a highest light transmittance H corresponding to the refresh rate F according to the refresh rate F and a formula ​ The highest light transmittance H is compared with the highest light transmittance corresponding to the default refresh rate. The ratio is used as the pixel adjustment coefficient K; wherein, is the average light transmittance corresponding to the default refresh rate, and tr is the response time of the display screen. an image processing unit configured to perform pixel processing on each frame of video data corresponding to the refresh rate according to a pixel adjustment coefficient; a video output unit configured to output the processed video data to the screen driving board, so that the screen driving board drives the display screen to display the video data.

4. The apparatus of claim 3, wherein, The image processing unit is specifically configured to: multiply a pixel value of each pixel point in each frame of video data corresponding to the refresh rate by the pixel adjustment coefficient.

5. The apparatus of claim 4, wherein, The refresh rate monitoring unit is specifically configured to: determine the refresh rate according to a field synchronization signal corresponding to each video frame in the video data to be displayed.

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