Display device and display control method

Abstract

The present application provides a display device and a display control method. The display device includes a mainboard, a power supply board, and a display screen. The mainboard obtains a refresh rate corresponding to video data to be displayed and adjusts a backlight control signal according to the refresh rate. The power supply board drives the backlight light source of the display screen according to the received backlight control signal, so that the backlight of the display screen reaches a corresponding backlight brightness, thereby stabilizing the brightness of the image displayed on the display screen and preventing the display screen from flickering.

Description

Technical Field

[0001] The present invention relates to electronic technology, and in particular to a display device and a display control method. Background Art

[0002] With the advancement of technology, users have increasingly higher requirements for display quality, such as display smoothness. Because the frame rate of the graphics processing unit (GPU) is not fixed when rendering images, display devices need to set a variable refresh rate (VRR) to match the GPU's frame rate changes to achieve smoother display.

[0003] However, changes in the refresh rate of the display screen will cause changes in the display brightness of the display screen, resulting in flickering during the display process, affecting the user experience. Summary of the Invention

[0004] The present application provides a display device and a display control method, which solves the problem that the display brightness of the display device changes with the change of refresh rate.

[0005] In a first aspect, an embodiment of the present application provides a display device, comprising: a main board, a screen driver board, and a display screen;

[0006] The screen driving board is connected between the main board and the display screen;

[0007] The mainboard is used for:

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

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

[0010] In a second aspect, an embodiment of the present application provides 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 according to the refresh rate, and the set of gamma voltages is sent to the screen driver board, wherein the set of gamma voltages is used to enable the screen driver board to map the received display signal to obtain a screen drive signal that drives the display screen to display the video data.

[0013] In a third aspect, an embodiment of the present application provides a display device, including a main board, a screen driver board, and a display screen;

[0014] The screen driving board is connected between the main board and the display screen;

[0015] The motherboard is configured as:

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

[0017] determining a pixel adjustment coefficient according to the refresh rate;

[0018] performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;

[0019] The processed video data is output to the screen driving board, so that the screen driving board drives the display screen to display the video data.

[0020] In a fourth aspect, an embodiment of the present application provides a display control method, comprising: obtaining a refresh rate corresponding to video data to be displayed;

[0021] determining a pixel adjustment coefficient according to the refresh rate;

[0022] performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;

[0023] The processed video data is output to a screen driver board, so that the screen driver board drives a display screen to display the video data.

[0024] In a fifth aspect, an embodiment of the present application provides a display device, comprising: a main board, a power board, and a display screen;

[0025] The main board is connected to the power board and the display screen respectively, and the power board is connected to the display screen.

[0026] The mainboard is configured to: obtain a 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 corresponding to different refresh rates is different;

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

[0028] In a sixth aspect, an embodiment of the present application provides 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 according to the refresh rate; wherein the duty cycles of the backlight control signals corresponding to different refresh rates are different, and the backlight control signal is used to drive the backlight light source of the display screen.

[0031] The display device and display control method provided in the embodiments of the present application obtain 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., and then control the display screen to display the video data based on the display parameters to adjust the brightness of the picture displayed on the display screen to stabilize and avoid flickering of the display picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0034] Figure 2 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0035] Figure 3 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0036] Figure 4 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of a gamma curve provided in an embodiment of the present application;

[0038] Figure 6 A flow chart of a display control method provided in an embodiment of the present application;

[0039] Figure 7 A schematic diagram showing the relationship between a display period and light transmittance provided in an embodiment of the present application;

[0040] Figure 8 A schematic diagram of Gamma voltage reduction provided in an embodiment of the present application;

[0041] Figure 9 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0042] Figure 10 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0043] Figure 11 A flow chart of a display control method provided in an embodiment of the present application;

[0044] Figure 12 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0045] Figure 13 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0046] Figure 14 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0047] Figure 15 A flowchart of a display control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] Currently, display devices can use variable refresh rate (VRR) display protocols, such as Gsync, Freesync, etc., to set different refresh rates to adapt to the frame rate changes of the graphics processing unit (GPU) to make the displayed content smoother. Among them, the display device can be any terminal device with a display screen, such as a TV, computer, smart display, all-in-one computer, mobile phone, notebook, etc. Taking the display screen as an LCD screen as an example, the change of the refresh rate of the display device will cause the proportion of the liquid crystal molecule flipping time to the total display cycle time to change, thereby causing the average light transmittance of the display screen per unit time to change, and then causing the display brightness to change.

[0050] Figure 1 A schematic diagram of a display cycle of a liquid crystal display provided in an embodiment of the present application. The display process of the liquid crystal display is divided into two parts, one is the response process and the other is the display process. Figure 1As shown in the figure, the horizontal axis is the time t axis, and the vertical axis is the light transmittance h axis. Among them, tr1 or tr2 is the response time corresponding to the response process, that is, the time required for the liquid crystal molecules to rotate to a specified state; ton is the display time corresponding to the display process, that is, the time it takes for the liquid crystal molecules to display normally after rotating to a specified state. Figure 1 Shown in the figure is the change in light transmittance of the liquid crystal display at two refresh rates. Refresh rate a is smaller than refresh rate b, so the display period of the liquid crystal display at refresh rate b is smaller. Under the same liquid crystal drive condition, the response time of the liquid crystal molecules is basically the same, that is, tr1 is equal to tr2. Therefore, the display period at refresh rate b is smaller than the display period at refresh rate a, which will shorten the display time ton, that is, ton2 is smaller than ton1.

[0051] It can be seen that when the refresh rate is higher, the brightness of the LCD screen is darker, and when the refresh rate is lower, the brightness of the LCD screen is brighter. As the refresh rate changes, the display screen of the LCD screen will flicker. The embodiment of the present application can be applied to the above scenario, and different display parameters are determined according to different refresh rates. The display device displays according to different display parameters to keep the display screen stable in display brightness and avoid flickering display screen. Among them, the display parameters include but are not limited to at least one of gamma voltage, pixel adjustment coefficient, backlight brightness, etc.

[0052] In order to maintain the stability of the display brightness during the display process, the embodiment of the present application obtains the refresh rate corresponding to the video data to be displayed in real time, and dynamically determines the display parameters based on the refresh rate, and then controls the display screen to display the video data based on the display parameters to adjust the brightness of the picture displayed on the display screen to be stable.

[0053] The embodiments of the present 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 value of the video data to enlarge or compress the size of the pixel value;

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

[0057] Method 1:

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

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

[0060] The screen driving board 200 generates a screen driving signal according to 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 the 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 the present application. Figure 3 As shown, the mainboard 100 at least includes: a refresh rate monitoring unit 120 and a gamma voltage processing unit 130 .

[0062] like Figure 3 As shown, the refresh rate monitoring unit 120 obtains the field synchronization signal of the video data to be displayed. Each frame of video data corresponds to a field synchronization signal, and the field synchronization signal carries the refresh rate corresponding to the video frame. Exemplarily, the field synchronization signal is sent before the corresponding video frame.

[0063] Exemplarily, the mainboard 100 further includes a video data acquisition unit 110, which is configured to acquire video data to be displayed from the video data source 002 and perform other processing such as decoding the video data. Optionally, the refresh rate monitoring unit 120 acquires a field synchronization signal of the video data to be displayed from the video data acquisition unit 110.

[0064] The video data source 002 may be a server, a storage medium, an image acquisition device, a High Definition Multimedia Interface (HDMI) channel, or the like.

[0065] Exemplarily, the video data source 002 first sends the video data to a GPU (not shown), which renders the video data and generates a field synchronization signal. The refresh rate monitoring unit 120 obtains the field synchronization signal and the rendered video data from the GPU. Optionally, the GPU can be provided on a graphics card or on a motherboard. Optionally, the graphics card can be independent of the motherboard or integrated into 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. An exemplary number of gamma voltages may be 12.

[0067] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of the present 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 gamma voltage adjustment coefficient 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 may be provided in a system-on-a-chip (SOC) of a motherboard.

[0070] The screen driver board 200 generates a gamma curve based on the received multiple gamma voltages, maps the received display signal according to the gamma curve, obtains a screen drive signal, and then drives the display screen 300 to display video data according to the screen drive signal. The display signal is a signal that complies with any image transmission protocol, such as a VByOne signal, a low-voltage differential signaling (LVDS) signal, etc.

[0071] Figure 5 Schematic diagram of a gamma curve provided by an embodiment of the present 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 the following gamma voltages according to the gamma voltages V1 to V12: Figure 5 The gamma curve shown is located in a two-dimensional coordinate system with image data values ​​on the horizontal axis and voltage values ​​on the vertical axis. It should be understood that V6 is equal to 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 to the generated gamma curve to obtain the image data values ​​corresponding to each display signal (image data values ​​are generally between 0 and 255). Based on the image data values, the screen driver board 200 generates screen drive signals 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 higher gamma voltage. The gamma curve generated by the increased gamma voltage will map lower image data values, resulting in higher brightness. Conversely, if the gamma voltage processing unit 130 outputs a lower gamma voltage, the display brightness can be reduced.

[0073] Generally speaking, different refresh rates correspond to different sets of gamma voltages, that is, a refresh rate corresponds to a set of gamma voltages one-to-one; 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 further include a Gamma chip (Integrated Circuit Chip, IC) (not shown in the figure), which may be provided on the main board or on the screen driver board, which is not required by the present application. For example, the Gamma IC and the gamma processing unit may be provided by an Integrated Circuit Chip (IC). 2 C) port connection, Gamma IC and screen driver board can be connected through multiple input and output I / O ports, Gamma IC through I 2 The C bus receives a set of gamma voltage values ​​sent by the gamma processing unit, and converts the voltage value of each gamma voltage into a voltage and sends it to the screen driving board 200 through multiple I / O ports.

[0075] In the display device 001 provided in the embodiment of the present application, the refresh rate corresponding to the video data to be displayed is obtained in real time through the refresh rate monitoring unit 120, and the size of a group of gamma voltages is adjusted in real time according to the refresh rate through the gamma voltage processing unit 130, and then the gamma curve is generated according to the group of gamma voltages through the screen driving board 200, thereby changing the mapping result of the display signal in the gamma curve, thereby realizing the adjustment of the display brightness and avoiding the problem of flickering display screen.

[0076] An embodiment of the present application further 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 flow chart of a display control method provided in an embodiment of the present application. Figure 6 As shown, the method includes:

[0078] S101: Obtain a refresh rate corresponding to video data to be displayed.

[0079] S102: Determine a set of gamma voltages according to the refresh rate.

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

[0081] 1. Based on the refresh rate, calculate the gamma voltage adjustment coefficient, and adjust multiple sets of default gamma voltages based on the adjustment coefficient to obtain a set of gamma voltages. The default gamma voltage set is a set of gamma voltages preset for the default refresh rate. Generally speaking, the default refresh rate is the fixed refresh rate of the display device when VRR is not set.

[0082] Figure 7 A schematic diagram of the relationship between display period and light transmittance provided in an embodiment of the present application. In order to control the display brightness of the display device to be always stable, it is necessary to control the average light transmittance of the display screen to be stable, that is, to ensure that the average light transmittance of the display screen remains unchanged at any refresh rate. Based on the above reasons, combined with Figure 7 As shown, the relationship between the refresh rate F and the display time ton can be expressed by formula (1) ton = 1 / F-tr, where tr is the response time of the display; the average light transmittance at the default refresh rate can be expressed by formula (2) Indicates that H is the maximum light transmittance at the refresh rate obtained in real time.

[0083] According to formula (1) and formula (2), we can get Since H has a positive correlation with the gamma voltage, the adjustment coefficient can be obtained

[0084] Furthermore, each default gamma voltage is subtracted from the reference voltage Vcom to obtain a difference value, which is then multiplied by an adjustment coefficient and summed with the reference voltage Vcom, thereby amplifying or reducing the default gamma voltage to obtain a final set of gamma voltages.

[0085] Figure 8 A schematic diagram of a Gamma voltage reduction provided in an embodiment of the present 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 dotted line.

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

[0087] In this implementation, gamma voltages at different refresh rates must be pre-acquired using experimental data. For example, while the displayed content remains unchanged, such as when 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 that the display brightness at that refresh rate is consistent with the display brightness at the default refresh rate. The adjusted set of gamma voltages is then used as the gamma voltage corresponding to that refresh rate, and the gamma voltage corresponding to each different refresh rate is determined accordingly. In this embodiment, by pre-determining the gamma voltage corresponding to each refresh rate, the calculation process is simplified and the processing efficiency of the gamma voltage processing unit 130 is improved.

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

[0089] Similar to the second implementation method, it is necessary to obtain the offset of the gamma voltage at different refresh rates in advance through experimental data. For example, when the display content remains unchanged, for example, when displaying pure white content, the refresh rate is continuously changed, and each time the refresh rate is changed, a set of default gamma voltages is adjusted so that the display brightness of the display screen at the refresh rate is consistent with the display brightness at the default refresh rate, and then the offset adjusted when adjusting a set of default gamma voltages is used as the offset of a set of gamma voltages corresponding to the refresh rate, and the offset of a set of gamma voltages corresponding to each different refresh rate is determined accordingly. It should be understood that the offset of a set of gamma voltages can be the same or different, and this solution does not require this. If the offset of a set of gamma voltages is the same, the amount of data for the correspondence between the refresh rate and the offset of the gamma voltage is small, saving storage space.

[0090] Furthermore, a final set of gamma voltages may be obtained through calculation according to a set of gamma voltage offsets and a set of default gamma voltages.

[0091] S103: Send 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, so that the screen driver board drives the display screen to display video data according to the set of gamma voltages and the received display signal.

[0093] In an embodiment of the present application, the refresh rate corresponding to the video data to be displayed is obtained in real time, and the size of a group of gamma voltages is adjusted in real time according to the refresh rate. A gamma curve is then generated based on the group of gamma voltages, and the mapping result of the display signal in the gamma curve is changed to adjust the display brightness, thereby avoiding the problem of flickering display screen.

[0094] Method 2:

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

[0096] The main board 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 according to the pixel adjustment coefficient, and then output the processed video data to the screen driver board.

[0097] The screen driving 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 the present application. Figure 10 As shown, illustratively, the mainboard 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] Exemplarily, the mainboard 400 further includes a video data acquisition unit 410 , which is configured to acquire video data to be displayed from the video data source 002 and perform processing such as decoding on the video data.

[0100] In the embodiment of the present application, the video data source 002, the video data acquisition unit 410, and the refresh rate monitoring unit 420 are consistent with the corresponding contents in the aforementioned embodiment and are not 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 according to the refresh rate in real time and sends the pixel adjustment coefficient matching the refresh rate to the image processing unit 440 .

[0102] Image processing unit 440 receives the pixel adjustment coefficients sent by adjustment coefficient determination unit 430 and obtains video data from video data acquisition unit 410. Image processing unit 440 performs pixel processing on each frame of video data corresponding to the obtained refresh rate based on the pixel adjustment coefficients. It should be understood that when the refresh rate is low, the display brightness is high, so pixel values ​​need to be amplified to reduce the display brightness; conversely, when the refresh rate is high, the display brightness is low, so pixel values ​​need to be compressed to increase the display brightness.

[0103] The video output unit 450 outputs the pixel-processed video data to the screen driving board 500 , so that the screen driving board 500 generates a driving signal and drives the display screen to display the video data through the driving signal.

[0104] Exemplarily, the video data acquisition unit 410 , the refresh rate monitoring unit 420 , the adjustment coefficient determination unit 430 , the image processing unit 440 and the video output unit 450 may all be provided in the SOC of the mainboard.

[0105] In the display device 003 provided in the embodiment of the present application, the refresh rate corresponding to the video data to be displayed is obtained in real time through the refresh rate monitoring unit 420, and the pixel adjustment coefficient is determined according to the refresh rate through the adjustment coefficient determination unit 430, and then the video data to be displayed is pixel-processed according to the pixel adjustment coefficient by the image processing unit 440, and the size of the pixel value is amplified or compressed to adjust the display brightness, so that the display brightness of the video data finally displayed on the display screen is stable.

[0106] An embodiment of the present application further 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 flow chart of a display control method provided in an embodiment of the present application. Figure 11 As shown, the method includes:

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

[0109] S202: Determine a pixel adjustment coefficient according to the refresh rate.

[0110] In order to determine different pixel adjustment coefficients for different refresh rates, the embodiment of the present application performs pixel processing on the pixels of each video frame so that the final displayed video data has a stable display brightness. In this step, the following two possible implementations are provided to determine the pixel adjustment coefficients.

[0111] 1. According to the refresh rate F and formula The maximum light transmittance H corresponding to the refresh rate F is calculated, and the ratio of the maximum light transmittance H to the maximum light transmittance H0 corresponding to the default refresh rate is used as the pixel adjustment coefficient K. is the average light transmittance corresponding to the default refresh rate, and tr is the response time of the display.

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

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

[0114] In this implementation, it is necessary to obtain the pixel adjustment coefficients at different refresh rates in advance through experimental data. For example, when the display content remains unchanged, for example, a pure white image is displayed, the refresh rate is continuously changed, and each time the refresh rate is changed, the pixel value of the video frame is adjusted by the same proportion, so that the display brightness of the display screen at the refresh rate is consistent with the display brightness at the default refresh rate, and then the adjustment proportion is used as the pixel adjustment coefficient, and the pixel adjustment coefficient corresponding to each different refresh rate is determined accordingly. In this embodiment, by pre-establishing the correspondence between the refresh rate and the pixel adjustment coefficient, and determining the corresponding pixel adjustment coefficient in real time according to the refresh rate, the error caused by the formula calculation is avoided and the accuracy of the display brightness adjustment is improved.

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

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

[0117] For example, if the pixel adjustment coefficients are (Kr, Kg, Kb), and the pixel value of a certain pixel is (200, 100, 200), then multiplying the two together yields (200*Kr, 100*Kg, 200*Kb). Kr, Kg, and Kb can be the same or different, and this solution does not require this.

[0118] S204: Outputting 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 an embodiment of the present application, 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, pixel processing is performed on the video data to be displayed according to the pixel adjustment coefficient, and the size of the pixel value is amplified or compressed to adjust the display brightness, so that the display brightness of the video data finally displayed on the display screen is stable.

[0120] Method 3:

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

[0122] The main board 700 is used to obtain the refresh rate corresponding to the video data to be displayed, and generate a backlight control signal according to the refresh rate, and then send the backlight control signal to the power board 800.

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

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

[0125] Exemplarily, the mainboard 700 further includes a video data acquisition unit 710 , which is configured to acquire video data to be displayed from the video data source 002 and perform processing such as decoding on the video data.

[0126] In the embodiment of the present application, the video data source 002, the video data acquisition unit 710, and the refresh rate monitoring unit 720 are consistent with the corresponding contents in the aforementioned embodiment and are not repeated here.

[0127] The refresh rate monitoring unit 720 sends the acquired refresh rate to the backlight adjustment unit 720 , and the backlight adjustment unit 730 determines the backlight brightness in real time according to 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 may be a signal that satisfies any transmission protocol, such as a pulse width modulation (PWM) signal, an I 2 C signal, Serial Peripheral Interface (SPI) signal, etc.

[0129] For example, different refresh rates correspond to different backlight brightnesses. To achieve the desired 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 illuminate, 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 the present application. Figure 14As 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 according to the refresh rate; the signal adjustment subunit 732 adjusts the duty cycle of the default backlight control signal according to the adjustment coefficient, and generates a backlight control signal corresponding to the refresh rate according to the adjusted duty cycle, wherein the default backlight control signal is a control signal preset for the default refresh rate.

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

[0133] In a specific implementation, the mainboard 700 further includes: an image processing unit 740 and a video output unit 750. The image processing unit 740 obtains video data from the video data acquisition unit 710, and performs rendering processing on the video data, such as optimizing the image quality of the video data, 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. Exemplarily, the video output unit 750 sends the video data to the screen driver board (not shown) via a display signal. The screen driver board generates a screen drive 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 the embodiment of the present application, the refresh rate corresponding to the video data to be displayed is obtained in real time by the refresh rate monitoring unit 720, 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 desired backlight brightness according to the backlight control signal. This embodiment compensates or suppresses the display brightness of the display screen by adjusting the backlight brightness, thereby maintaining a stable display brightness of the display screen.

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

[0136] S301: Obtain a refresh rate corresponding to video data to be displayed.

[0137] S302: Generate a backlight control signal according to the refresh rate.

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

[0139] The present embodiment provides the following two possible implementations for determining the adjustment coefficient based on the refresh rate:

[0140] 1. According to the refresh rate F and formula The adjustment coefficient K is calculated.

[0141] in, is the average light transmittance corresponding to the default refresh rate, tr is 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 backlight brightness that needs to be adjusted, so the formula Able to derive formula And the formula The derivation process and Figure 7 The derivation process of 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 at different refresh rates in advance through experimental data. For example, when the display content remains unchanged, such as displaying a pure white image or other grayscale image, the refresh rate is continuously changed. Each time the refresh rate is changed, the duty cycle of the backlight drive signal is adjusted so that the display brightness of the display at the refresh rate is consistent with the display brightness at the default refresh rate. The ratio of the duty cycle of the adjusted 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 the refresh rate.

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

[0146] For example, let's use a PWM backlight control signal. For a specific video frame, assuming the default refresh rate is 60Hz, the PWM signal's duty cycle is PWM1 = 15%. By comparing the relationship between refresh rate and backlight control signal, we know that at a refresh rate of 120Hz, the adjustment factor K = 2. Therefore, the PWM signal's duty cycle should be set to PWM2 * K = 30%.

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

[0148] In an embodiment of the present application, by acquiring the refresh rate corresponding to the video data to be displayed in real time, and generating a backlight control signal based on the refresh rate, and then driving the backlight light source of the display screen to achieve 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 appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with 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. 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 does not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention 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, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 display device, characterized in that: include: Mainboard, power board and display; The mainboard is connected to the power board and the display screen respectively, and the power board is connected to the display screen; The mainboard is configured to: obtain a refresh rate corresponding to the video data to be displayed, and determine an adjustment coefficient according to the refresh rate; Multiplying the adjustment coefficient by the default duty cycle of the backlight control signal to obtain an adjusted duty cycle; generating a backlight control signal corresponding to the refresh rate according to the adjusted duty cycle; wherein the default backlight control signal is a control signal preset for the default refresh rate, and the duty cycles of the backlight control signals corresponding to different refresh rates are different; The power board is configured to: receive the backlight control signal and drive the backlight light source to light up according to the backlight control signal; The mainboard is specifically configured as follows: according to the refresh rate F and the formula , calculate and obtain the adjustment coefficient K; in, is the average light transmittance corresponding to the default refresh rate, tr is the response time of the display screen, and A is the preset coefficient.

2. The device according to claim 1, characterized in that The mainboard includes a refresh rate monitoring unit and a backlight adjustment unit; The refresh rate monitoring unit is configured to: obtain a refresh rate corresponding to the video data; The backlight adjustment unit is configured to generate the backlight control signal according to the refresh rate.

3. The device according to claim 2, characterized in that The backlight adjustment unit includes: an adjustment coefficient determination subunit and a signal adjustment subunit; The adjustment coefficient determination subunit is configured to: determine the adjustment coefficient according to the refresh rate; The signal adjustment subunit is configured to: adjust the duty cycle of the default backlight control signal according to the adjustment coefficient, and generate a backlight control signal corresponding to the refresh rate according to the adjusted duty cycle; the default backlight control signal is a control signal preset for the default refresh rate.

4. The device according to claim 3, characterized in that The adjustment coefficient determination subunit is specifically configured as follows: The adjustment coefficient is determined according to the refresh rate and a correspondence between a preset refresh rate and an adjustment coefficient.

5. The device according to any one of claims 1 to 4, characterized in that The refresh rate monitoring unit is specifically configured as follows: The refresh rate is determined according to a field synchronization signal corresponding to each video frame in the video data to be displayed.

6. A display control method, characterized in that: Applied to a display device, the display device includes a main board, a power board, and a display screen, and the method includes: Get the refresh rate corresponding to the video data to be displayed; determining an adjustment coefficient according to the refresh rate; Multiplying the adjustment coefficient by the default duty cycle of the backlight control signal to obtain an adjusted duty cycle; Generating a backlight control signal corresponding to the refresh rate according to the adjusted duty cycle; wherein the default backlight control signal is a control signal preset for the default refresh rate, and the duty cycles of the backlight control signals corresponding to different refresh rates are different, and the backlight control signal is used to drive the backlight light source to light up; Determining the adjustment coefficient according to the refresh rate includes: According to the refresh rate F and the formula , calculate and obtain the adjustment coefficient K; in, is the average light transmittance corresponding to the default refresh rate, tr is the response time of the display screen, and A is the preset coefficient.

7. The method according to claim 6, characterized in that Generating a backlight control signal according to the refresh rate includes: determining an adjustment coefficient according to the refresh rate; According to the adjustment coefficient, the duty cycle of the default backlight control signal is adjusted, and according to the adjusted duty cycle, a backlight control signal corresponding to the refresh rate is generated; the default backlight control signal is a control signal preset for the default refresh rate.

8. The method according to claim 7, characterized in that Generating a backlight control signal according to the refresh rate includes: The adjustment coefficient is determined according to the refresh rate and a correspondence between a preset refresh rate and an adjustment coefficient.

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