CN113763904A - Display device and display control method - Google Patents
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The application provides a display device and a control method of display. The display equipment comprises a mainboard, a screen drive board and a display screen, wherein the refresh rate corresponding to the video data to be displayed is acquired through the mainboard, a pixel adjustment coefficient is determined through the mainboard according to the refresh rate, pixel processing is carried out on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient, the processed video data is output to the screen drive board through the mainboard, the screen drive board drives the display screen to display the video data, the display brightness of the display screen is adjusted to be stable, and the display picture is prevented from being dim and bright.
Description
Technical Field
The present invention relates to electronic technologies, and in particular, to a display device and a display control method.
Background
With the development of technology, users have higher and higher requirements on the display effect of the display device, such as the fluency of display. Since the frame Rate of a Graphics Processing Unit (GPU) is not fixed during the process of rendering an image, a display device needs to set a Variable Refresh Rate (VRR) to match the frame Rate change of the GPU, so that the content displayed by the display device is smoother.
However, the change of the refresh rate of the display screen may change the display brightness of the display screen, which may cause the display process to be dim and dim, and may affect the user experience.
Disclosure of Invention
The application provides a display device and a display control method, which solve the problem that the brightness of the display device changes with the change of a refresh rate.
In a first aspect, an embodiment of the present application provides a display device, including: the display screen 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 mainboard is used for:
obtaining a refresh rate corresponding to video data to be displayed;
and determining a group of gamma voltages according to the refresh rate, and sending the group of gamma voltages to the screen driving board, wherein the group of gamma voltages are used for enabling the screen driving board to map the received display signals to obtain screen driving signals for driving the display screen to display the video data.
In a second aspect, an embodiment of the present application provides a display control method, including:
obtaining a refresh rate corresponding to video data to be displayed;
and determining a group of gamma voltages according to the refresh rate, and sending the group of gamma voltages to a screen driving board, wherein the group of gamma voltages are used for enabling the screen driving board to map the received display signals to obtain screen driving signals for driving a display screen to display the video data.
In a third aspect, an embodiment of the present application provides a display device, including a motherboard, a screen driver board, and a display screen;
the screen driving board is connected between the main board and the display screen;
the motherboard is configured to:
obtaining a refresh rate corresponding to video data to be displayed;
determining a pixel adjustment coefficient according to the refresh rate;
performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;
and outputting the processed video data to the screen driving board, so that the screen driving board drives the display screen to display the video data.
In a fourth aspect, an embodiment of the present application provides a display control method, including: obtaining a refresh rate corresponding to video data to be displayed;
determining a pixel adjustment coefficient according to the refresh rate;
performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;
and 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.
In a fifth aspect, an embodiment of the present application provides a display device, including: the power supply comprises a main board, a power supply board and a display screen;
the main board is respectively connected with the power panel and the display screen, the power panel is connected with the display screen,
the motherboard is configured to: the method comprises the steps of obtaining a refresh rate corresponding to video data to be displayed, and generating backlight control signals according to the refresh rate, wherein duty ratios of the backlight control signals corresponding to different refresh rates are different;
the power strip is configured to: and receiving the backlight control signal, and driving a backlight light source of the display screen according to the backlight control signal.
In a sixth aspect, an embodiment of the present application provides a display control method, including:
obtaining a refresh rate corresponding to video data to be displayed;
generating a backlight control signal according to the refresh rate; the duty ratios of the backlight control signals corresponding to different refresh rates are different, and the backlight control signals are used for driving backlight light sources of the display screen.
According to the display device and the display control method provided by the embodiment of the application, the refresh rate corresponding to the video data to be displayed is obtained in real time, the display parameters including but not limited to at least one of gamma voltage, pixel adjustment coefficient, backlight brightness and the like are dynamically determined according to the refresh rate, and then the display screen is controlled to display the video data according to the display parameters, so that the brightness stability of the displayed image of the display screen is adjusted, and the displayed image is prevented from being dim and bright.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a display period of a liquid crystal display panel according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a gamma curve provided by an embodiment of the present application;
fig. 6 is a schematic flowchart of a display control method according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram illustrating a relationship between a display period and a light transmittance according to an embodiment of the present application;
fig. 8 is a schematic diagram of a Gamma voltage reduction according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 11 is a schematic flowchart of a display control method according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 15 is a flowchart illustrating a display control method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Currently, a display device can set different Refresh rates through a Variable Refresh Rate (VRR) display protocol, such as Gsync, fresync, etc., to adapt to frame Rate changes of a Graphics Processing Unit (GPU), so as to make displayed content more smooth. The display device can be any terminal device with a display screen, such as a television, a computer, an intelligent display screen, an all-in-one machine, a mobile phone, a notebook computer and the like. Taking the display screen as an example of a liquid crystal display screen, the change of the refresh rate of the display device can cause the ratio of the liquid crystal molecule turning time to the total time of the display period to change, thereby causing the average light transmittance of the display screen to change in unit time, and further causing the change of the display brightness.
Fig. 1 is a schematic view of a display period of a liquid crystal display provided in an embodiment of the present application. The display process of the liquid crystal display screen is divided into two parts, one part is a response process, and the other part is a display process. As shown in fig. 1, the horizontal axis represents time t axis, and the vertical axis represents light transmittance h axis. Wherein tr1 or tr2 is the response time corresponding to the response process, i.e. the time required for the liquid crystal molecules to rotate to the designated state; ton is the display time corresponding to the display process, i.e. the time for normal display after the liquid crystal molecules rotate to the designated state. Fig. 1 shows the change of the light transmittance of the liquid crystal display panel at two refresh rates, where a is smaller than b, so that the display period of the liquid crystal display panel at b is smaller, and the response time of the liquid crystal molecules is substantially the same under the same liquid crystal driving, that is, tr1 is equal to tr2, so that the display period at b is smaller than that at a, and the display time ton is shortened, that is, ton2 is smaller than ton 1.
It can be seen that the higher the refresh rate, the darker the brightness of the liquid crystal display, and the lower the refresh rate, the brighter the brightness of the liquid crystal display. With the change of the refresh rate, the display image of the liquid crystal display screen can be dim. The application of the embodiment of the application can be similar to that in the above scene, different display parameters are determined according to different refresh rates, and the display device displays according to the different display parameters, so that the display screen keeps the stability of the display brightness, and the display picture is prevented from being dim and bright. The display parameter includes, but is not limited to, at least one of a gamma voltage, a pixel adjustment coefficient, a backlight brightness, and the like.
In order to keep the display screen stable in the display brightness, the embodiment of the application obtains the refresh rate corresponding to the video data to be displayed in real time, dynamically determines the display parameters according to the refresh rate, and controls the display screen to display the video data according to the display parameters so as to adjust the brightness stability of the picture displayed by the display screen.
The embodiment of the application at least comprises the following three possible implementation modes.
Dynamically adjusting gamma voltage to change the average light transmittance of liquid crystal molecules;
the second mode is that the pixel value of the video data is dynamically adjusted, and the size of the pixel value is amplified or compressed;
and thirdly, dynamically adjusting the backlight brightness, and compensating or suppressing the display brightness of the display screen.
The first method is as follows:
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 2, the display device 001 includes a main board 100, a screen driving board 200, and a display screen 300. The screen driving board 200 is connected between the main board 100 and the display screen 300.
The main board 100 is configured to obtain a refresh rate corresponding to video data to be displayed, determine a set of gamma voltages according to the refresh rate, and send the set of gamma voltages to the screen driving board 200. The set of gamma voltages is used to enable the screen driving board 200 to map the received display signals, so as to obtain the screen driving signals for driving the display screen 300 to display the video data.
The screen driving board 200 generates a screen driving signal according to a set of gamma voltages and the received display signal, and transmits the screen driving signal to the display screen 300, so that the display screen 300 displays video data according to the screen driving signal.
Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 3, the main board 100 at least includes: a refresh rate monitoring unit 120 and a Gamma voltage processing unit 130.
As shown in fig. 3, for example, the refresh rate monitoring unit 120 obtains a field synchronization signal of video data to be displayed, where each frame of video data corresponds to one field synchronization signal, and the field synchronization signal carries a refresh rate corresponding to the video frame. Illustratively, the field sync signal is transmitted prior to the corresponding video frame.
Illustratively, the main board 100 further includes a video data obtaining unit 110, where the video data obtaining unit 110 is configured to obtain video data to be displayed from the video data source 002, and decode the video data, and the like. Optionally, the refresh rate monitoring unit 120 acquires the field sync signal of the video data to be displayed from the video data acquiring unit 110.
The video data source 002 may be a server, a storage medium, an image capture device, a High Definition Multimedia Interface (HDMI) channel, or the like.
For example, the video data source 002 first sends the video data to a GPU (not shown in the figure), so that the GPU renders the video data and generates a field sync signal, and the refresh rate monitor unit 120 obtains the field sync signal and the rendered video data from the GPU. Optionally, the GPU may be disposed on the graphics card or disposed on the motherboard, and optionally, the graphics card may be independent of the motherboard or integrated on the motherboard.
The refresh rate monitoring unit 120 transmits the acquired refresh rate to the gamma voltage processing unit 130, and the gamma voltage processing unit 130 determines a set of gamma voltages according to the refresh rate and transmits the set of gamma voltages to the screen driving board 200. The set of gamma voltages includes a plurality of gamma voltages required for the screen driving board 200 to map the display signals, and an exemplary number of gamma voltages may be 12.
Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 4, the gamma voltage processing unit 130 illustratively includes: a gamma voltage coefficient confirming subunit 131 and a gamma voltage adjusting subunit 132.
The gamma voltage coefficient confirming subunit 131 calculates an adjustment coefficient of the gamma voltage according to the refresh rate; the gamma voltage adjusting 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 a default refresh rate.
Specifically, the video data acquisition unit 110, the refresh rate monitoring unit 120, and the gamma voltage processing unit 130 may be disposed in a System-on-a-Chip (SOC) of the motherboard.
The screen driving board 200 generates a Gamma curve according to the received Gamma voltages, maps the received display signals according to the Gamma curve to obtain screen driving signals, and drives the display screen 300 to display video data according to the screen driving signals. The display signal is a signal conforming to any image transmission protocol, such as a VByOne signal, a Low-Voltage Differential Signaling (LVDS) signal, and the like.
Fig. 5 is a schematic diagram of a gamma curve according to an embodiment of the present disclosure. Illustratively, the gamma voltage processing unit 130 transmits 12 gamma voltages V1 to V12 to the panel driving board 200, and the panel driving board 200 generates a gamma curve as shown in fig. 5 from the gamma voltages V1 to V12, the gamma curve being located in a two-dimensional coordinate system with the horizontal axis being image data values and the vertical axis being voltage values, it being understood that V6 is equal to V7 and is equal to the reference voltage Vcom of liquid crystal molecule deflection. Further, the panel driving board 200 maps the voltage values of the received display signals in the generated gamma curve to obtain image data values (the image data values are generally between 0 and 255) corresponding to each display signal, and generates the panel driving signals according to the image data values to drive the display panel 300 to display corresponding video data.
It will be appreciated that differences in the gamma curves will cause the display signal to map out different image data values. When the refresh rate is increased, the gamma voltage processing unit 130 should be made to output a larger gamma voltage, and the mapped image data value is lower and thus the brightness is higher according to the gamma curve generated by the increased gamma voltage. Conversely, the gamma voltage processing unit 130 is made to output a smaller gamma voltage, which may be a reduction in the display brightness of the display screen.
Generally, different refresh rates correspond to different sets of gamma voltages, i.e., the refresh rates correspond to a set of gamma voltages one to one; alternatively, multiple refresh rates correspond to a set of gamma voltages, such as multiple numerically adjacent refresh rates.
Illustratively, a Gamma Chip (IC) (not shown) may be further included in the display device 001, and the Gamma IC may be disposed on the motherboard or on the screen driving board, which is not required in the present application. Illustratively, the Gamma IC and the Gamma processing unit may pass through (Inter Integrated-Circuit, I)2C) The Gamma IC and the screen drive board can be connected through a plurality of input/output I/O ports, and the Gamma IC is connected through I2The C bus receives a set of voltage values of the gamma voltages transmitted from the gamma processing unit, converts the voltage values of each gamma voltage into voltages, and transmits the voltages to the screen driving board 200 through the plurality of I/O ports, respectively.
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, the magnitude of a set of gamma voltages is adjusted in real time according to the refresh rate through the gamma voltage processing unit 130, and then a gamma curve is generated according to the set of gamma voltages through the screen driving board 200, so that the mapping result of the display signal in the gamma curve is changed, the adjustment of the display brightness is realized, and the problem of flickering and dim of the display picture is avoided.
The 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.
Fig. 6 is a flowchart illustrating a display control method according to an embodiment of the present application. As shown in fig. 6, the method includes:
s101: and acquiring a refresh rate corresponding to the video data to be displayed.
S102: a set of gamma voltages is determined based on the refresh rate.
In this step, in order to control the gamma voltages to adaptively change with the change of the refresh rate, a set of gamma voltages is determined in real time according to the refresh rate by the gamma voltage processing unit 130, and this embodiment of the present application provides the following three possible implementation manners:
firstly, calculating an adjusting coefficient of the gamma voltage according to the refresh rate, and adjusting a plurality of groups of default gamma voltages according to the adjusting coefficient to obtain a group of gamma voltages. The set of default gamma voltages is a set of gamma voltages preset for a default refresh rate, and generally, the default refresh rate is a fixed refresh rate of the display device when VRR is not set.
Fig. 7 is a schematic diagram illustrating a relationship between a display period and a light transmittance according to an embodiment of the present application. In order to control the display brightness of the display device to be stable all the time, the average light transmittance of the display screen needs to be controlled to be stable, that is, the average light transmittance of the display screen is ensured to be unchanged at any refresh rate. For the above reasons, as shown in fig. 7, it can be found that the relationship between the refresh rate F and the display time ton can be expressed by the 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 determined by equation (2)
Where H is the highest light transmission at the refresh rate obtained in real time.
From the formula (1) and the formula (2), it can be found
Since H has a positive correlation with the gamma voltage, an adjustment coefficient can be obtained
Further, each default gamma voltage is subjected to difference operation with the reference voltage Vcom to obtain a difference value, the difference value is multiplied by an adjustment coefficient, and then the difference value is subjected to summation operation with the reference voltage Vcom, that is, the default gamma voltage is amplified or reduced to obtain a final set of gamma voltages.
Fig. 8 is a schematic diagram of reducing a Gamma voltage according to an embodiment of the present disclosure. When the adjustment coefficient K is smaller than 1, a set of default gamma voltages is scaled down, for example, from the solid line to the position shown by the dotted line in fig. 8.
And secondly, determining a group of gamma voltages according to the refresh rate and the corresponding relation between the preset refresh rate and the gamma voltages.
In this implementation, the gamma voltages at different refresh rates need to be obtained in advance through test data. Illustratively, under the condition that display content is not changed, for example, pure white content is displayed, the refresh rate is continuously changed, and when the refresh rate is changed each time, the display brightness of the display screen at the refresh rate is made to be consistent with the display brightness at the default refresh rate by adjusting a set of default gamma voltages, and then the adjusted set of gamma voltages are used as the gamma voltages corresponding to the refresh rate, so as to determine the gamma voltage corresponding to each different refresh rate. In this embodiment, since the gamma voltage corresponding to each refresh rate is predetermined, the calculation process is simplified, and the processing efficiency of the gamma voltage processing unit 130 is improved.
Thirdly, determining the offset of a group of gamma voltages according to the refresh rate and the corresponding relation between the preset refresh rate and the offset of the gamma voltages; and calculating a set of gamma voltages according to the offset of the set of gamma voltages and a set of default gamma voltages.
Similar to the second implementation, the offset of the gamma voltage at different refresh rates needs to be obtained in advance through experimental data. Illustratively, under the condition that the display content is not changed, for example, pure white content is displayed, the refresh rate is continuously changed, and when the refresh rate is changed each time, the display brightness of the display screen at the refresh rate is made to be consistent with the display brightness at the default refresh rate by adjusting a set of default gamma voltages, and then the offset adjusted when the set of default gamma voltages is adjusted is used as the offset of the set of gamma voltages corresponding to the refresh rate, so as to determine the offset of the set of gamma voltages corresponding to each different refresh rate. It should be understood that the offset of a set of gamma voltages may be the same or different, and this scheme is not required. If the offsets of the gamma voltages in a group are the same, the data volume of the corresponding relation between the refresh rate and the offset of the gamma voltages is small, and the storage space is saved.
Further, a final set of gamma voltages can be obtained by calculation according to the offset of the set of gamma voltages and a set of default gamma voltages.
S103: a set of gamma voltages is sent to the panel driving board.
In this step, a set of gamma voltages is sent to the screen driving board, so that the screen driving board drives the display screen to display video data according to the set of gamma voltages and the received display signals.
In the embodiment of the application, the refresh rate corresponding to the video data to be displayed is obtained in real time, the magnitude of a group of gamma voltages is adjusted in real time according to the refresh rate, and then a gamma curve is generated according to the group of gamma voltages, so that the mapping result of the display signals in the gamma curve is changed, the adjustment of the display brightness is realized, and the problem of flickering and darkness of the display image is avoided.
The second method comprises the following steps:
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 9, the display device 003 includes the main board 400, the screen driving board 500, and the display screen 600. The screen driving board 500 is connected between the main board 400 and the display screen 600.
The main board 400 is configured to obtain a refresh rate corresponding to video data to be displayed, determine a pixel adjustment coefficient according to the refresh rate, perform pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient, and output the processed video data to the screen driving board.
The screen driving board 500 drives the display screen 600 to display the processed video data.
Fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 10, for example, the main board 400 includes at least: a refresh rate monitoring unit 420, an adjustment coefficient determining unit 430, an image processing unit 440, and a video output unit 450.
Illustratively, the main board 400 further includes a video data obtaining unit 410, and the video data obtaining unit 410 is configured to obtain video data to be displayed from the video data source 002, and perform processing such as decoding on the video data.
In the embodiment of the present application, the video data source 002, the video data obtaining unit 410, and the refresh rate monitoring unit 420 are the same as those in the foregoing embodiments, and are not described herein again.
The refresh rate monitoring unit 420 sends the obtained refresh rate to the adjustment coefficient determining unit 430, and the adjustment coefficient determining unit 430 determines a pixel adjustment coefficient according to the refresh rate in real time and sends the pixel adjustment coefficient matched with the refresh rate to the image processing unit 440.
The image processing unit 440 receives the pixel adjustment coefficient sent by the adjustment coefficient determination unit 430, and acquires video data from the video data acquisition unit 410. The image processing unit 440 performs pixel processing on each frame of video data corresponding to the obtained refresh rate according to the pixel adjustment coefficient. It should be understood that when the refresh rate is low and the display brightness is high, the pixel value needs to be amplified to reduce the display brightness; conversely, when the refresh rate is high and the display brightness is low, the pixel values need to be compressed to improve the display brightness.
The video output unit 450 outputs the video data subjected to the pixel processing 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.
For example, 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 be disposed in the SOC of the main board.
In the display device 003 provided in the embodiment of the present application, the refresh rate monitoring unit 420 obtains the refresh rate corresponding to the video data to be displayed in real time, the adjustment coefficient determining unit 430 determines the pixel adjustment coefficient according to the refresh rate, the pixel processing unit 440 performs pixel processing on the video data to be displayed according to the pixel adjustment coefficient, and enlarges or compresses the size of the pixel value, so as to adjust the display brightness, and stabilize the display brightness of the video data finally displayed on the display screen.
The 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.
Fig. 11 is a flowchart illustrating a display control method according to an embodiment of the present application. As shown in fig. 11, the method includes:
s201: and acquiring a refresh rate corresponding to the video data to be displayed.
S202: a pixel adjustment factor is determined based on the refresh rate.
In the embodiment of the application, different pixel adjustment coefficients are determined according to different refresh rates, so that pixel processing is performed on pixels of each video frame, and finally displayed video data has stable display brightness. In this step, the following two possible implementations are provided to determine the pixel adjustment coefficients.
According to a refresh rate F and a formula
Calculating to obtain the highest light transmittance H corresponding to the refresh rate F, and comparing the highest light transmittance H with the highest light transmittance H corresponding to the default refresh rate0As the ratio ofThe prime adjustment factor K. Wherein,
and tr is the average light transmission rate corresponding to the default refresh rate, and is the response time of the display screen.
Formula (II)
The derivation process is the same as that of the embodiment shown in fig. 7, and is not described again here.
And secondly, determining a pixel adjustment coefficient according to the refresh rate and the corresponding relation between the preset refresh rate and the pixel adjustment coefficient.
In this implementation, the pixel adjustment coefficients at different refresh rates need to be obtained in advance through test data. Illustratively, under the condition that the display content is not changed, for example, a pure white image is displayed, the refresh rate is continuously changed, and when the refresh rate is changed each time, the display brightness of the display screen at the refresh rate is made to be consistent with the display brightness at the default refresh rate by adjusting the pixel value of the video frame in the same proportion, and then the adjustment proportion is used as a pixel adjustment coefficient, so as to determine the pixel adjustment coefficient corresponding to each different refresh rate. In the embodiment, the corresponding relation between the refresh rate and the pixel adjustment coefficient is established in advance, and the corresponding pixel adjustment coefficient is determined in real time according to the refresh rate, so that errors caused by formula calculation are avoided, and the accuracy of display brightness adjustment is improved.
S203: and carrying out pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient.
Illustratively, the pixel value of each pixel point in each frame of video data corresponding to the refresh rate is multiplied by the pixel adjustment coefficient to obtain the processed video data.
For example, if the pixel adjustment coefficient is (Kr, Kg, Kb), and the pixel value of a certain pixel is (200, 100, 200), the two are multiplied to obtain (200 × Kr, 100 × Kg, 200 × Kb). Wherein Kr, Kg and Kb may be the same or different, and this scheme does not require it.
S204: and 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.
In the embodiment of the application, the display brightness is adjusted by acquiring the refresh rate corresponding to the video data to be displayed in real time, determining the pixel adjustment coefficient according to the refresh rate, performing pixel processing on the video data to be displayed according to the pixel adjustment coefficient, and amplifying or compressing the pixel value, so that the display brightness of the video data finally displayed by the display screen is stable.
The third method comprises the following steps:
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 12, the display device 004 includes a main board 700, a power supply board 800, and a display screen 900. The main board 700 is connected to the power board 800 and the display screen 900 respectively, and the power board 800 is further connected to the display screen 900, for example, the power board 800 is connected to the backlight source of the display screen 900.
The main board 700 is configured to obtain a refresh rate corresponding to video data to be displayed, generate a backlight control signal according to the refresh rate, and send the backlight control signal to the power board 800.
The power board 800 drives the backlight source of the display screen 900 according to the received backlight control signal. The backlight control signals corresponding to different refresh rates have different characteristics, and the characteristics comprise duty ratios.
Fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 13, the main board 700 at least includes: a refresh rate monitoring unit 720 and a backlight adjusting unit 730. The power panel 800 includes: the backlight driving unit 810.
Illustratively, the main board 700 further includes a video data obtaining unit 710, where the video data obtaining unit 710 is configured to obtain video data to be displayed from the video data source 002, and perform processing such as decoding on the video data.
In the embodiment of the present application, the video data source 002, the video data obtaining unit 710 and the refresh rate monitoring unit 720 are the same as those in the foregoing embodiments, and are not described herein again.
The refresh rate monitoring unit 720 sends the obtained refresh rate to the backlight adjusting unit 720, and the backlight adjusting unit 730 determines the backlight brightness according to the refresh rate in real time, adjusts the backlight control signal, and sends the backlight control signal to the backlight driving unit 810.
Illustratively, the backlight control signal may be a signal satisfying any transmission protocol, such as a Pulse Width Modulation (PWM) signal, I2C signals, Serial Peripheral Interface (SPI) signals, and the like.
Illustratively, different refresh rates correspond to different backlight luminances, and in order to achieve the required backlight luminance, the backlight adjusting unit 730 needs to adjust the duty ratio of the backlight control signal. It should be understood that the higher the duty ratio of the backlight control signal, the more often the time period for driving the backlight light source to be turned on, the higher the backlight brightness perceived by human eyes; conversely, the lower the duty ratio of the backlight control signal, the lower the brightness of the backlight.
Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 14, the backlight adjusting unit 730 exemplarily includes: the adjustment coefficients determine the subunit 731 and the signal adjustment subunit 732.
The adjustment coefficient determination subunit 731 determines an adjustment coefficient according to the refresh rate; the signal adjusting subunit 732 adjusts the duty ratio 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 ratio, where the default backlight control signal is a control signal preset for the default refresh rate.
The backlight driving unit 810 drives the backlight of the display panel to a desired backlight luminance according to the backlight control signal to compensate for a darker display luminance when the refresh rate is high or to suppress a brighter display luminance when the refresh rate is low.
In a specific implementation, the main board 700 further includes: an image processing unit 740 and a video output unit 750. The image processing unit 740 obtains the video data from the video data obtaining unit 710, performs rendering processing on the video data, for example, performs image quality optimization processing on the video data, and 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 displaying, for example, the video output unit 750 sends the video data to a screen driving board (not shown in the figure) through a display signal, and the screen driving board generates a screen driving signal and sends the screen driving signal to the display screen 900 so as to drive the display screen 900 to display the corresponding video data.
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, the backlight control signal is adjusted according to the refresh rate by the backlight adjusting unit 730, and the backlight of the display screen is driven to achieve the required backlight brightness by the backlight driving unit 810 according to the backlight control signal. The embodiment compensates or inhibits the display brightness of the display screen by adjusting the backlight brightness, so that the display brightness of the display screen is kept stable.
Fig. 15 is a flowchart illustrating a display control method according to an embodiment of the present application. As shown in fig. 15, the method includes:
s301: and acquiring a refresh rate corresponding to the video data to be displayed.
S302: and generating a backlight control signal according to the refresh rate.
In this step, in order to control the backlight brightness to adaptively change with the change of the refresh rate, a backlight control signal corresponding to the refresh rate is generated by the backlight adjusting unit 730 in real time according to the refresh rate, and it should be understood that the backlight control signal has a duty ratio corresponding to the refresh rate. Illustratively, an adjustment coefficient is determined according to the refresh rate, and the duty ratio 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 control signal preset for a default refresh rate.
The embodiment of the application provides the following two possible implementation ways for how to determine the adjustment coefficient according to the refresh rate:
according to a refresh rate F and a formula
And calculating to obtain an adjustment coefficient K.
Wherein,
and tr 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. Alternatively, a is generally a number greater than 0 and less than 2.
It should be understood that the maximum light transmittance H is directly proportional to the backlight brightness to be adjusted, and thus is represented by the formula
Can derive a formula
And formula
The derivation process is the same as that of the embodiment shown in fig. 7, and is not described again here.
And secondly, determining an adjustment coefficient according to the refresh rate and the corresponding relation between the preset refresh rate and the adjustment coefficient.
In this implementation, the pixel adjustment coefficients at different refresh rates need to be obtained in advance through test data. Illustratively, under the condition that the display content is not changed, for example, a pure white image or other gray-scale images are displayed, the refresh rate is continuously changed, and when the refresh rate is changed each time, the display brightness of the display screen at the refresh rate is made to be consistent with the display brightness at the default refresh rate by adjusting the duty ratio of the backlight driving signal, and then the ratio of the duty ratio of the adjusted backlight control signal to the duty ratio of the backlight control signal at the default refresh rate is used as the adjustment coefficient corresponding to the refresh rate.
Further, the adjustment coefficient corresponding to the refresh rate obtained in real time is multiplied by the duty ratio of the default backlight control signal to obtain the duty ratio of the backlight control signal corresponding to the refresh rate, and the duty ratio of the default backlight control signal is adjusted to the duty ratio of the required backlight control signal, and then the backlight driving signal is output to the backlight driving unit 810.
The backlight control signal is taken as a PWM signal for explanation. For a certain video frame, assuming that the duty ratio of the PWM signal is PWM 1-15% at the default refresh rate of 60Hz, it is known by comparing the corresponding relationship between the refresh rate and the backlight control signal, and when the refresh rate is 120Hz, the adjustment coefficient K is 2. The duty cycle of the PWM signal should be set to PWM 2K-30%.
S303: and driving a backlight light source of the display screen according to the backlight control signal.
In the embodiment of the application, the display brightness of the display screen is compensated or inhibited by adjusting the backlight brightness, so that the display brightness of the display screen is kept stable.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The display equipment is characterized by comprising 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 motherboard is configured to:
obtaining a refresh rate corresponding to video data to be displayed;
determining a pixel adjustment coefficient according to the refresh rate;
performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;
and outputting the processed video data to the screen driving board, so that the screen driving board drives the display screen to display the video data.
2. The apparatus of claim 1, wherein the motherboard comprises:
the refresh rate monitoring unit is configured to acquire a refresh rate corresponding to video data to be displayed;
an adjustment coefficient determination unit configured to determine a pixel adjustment coefficient according to the refresh rate;
the image processing unit is configured to perform pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;
and the video output unit is 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.
3. The device according to claim 2, characterized in that the adjustment coefficient determining unit is specifically configured to:
according to the refresh rate F and formula
Calculating to obtain the highest light transmittance H corresponding to the refresh rate F;
the highest light transmittance H corresponding to the default refresh rate is obtained0The ratio of (a) to (b) is used as the pixel adjustment coefficient K;
wherein,
and tr is the average light transmittance corresponding to the default refresh rate, and is the response time of the display screen.
4. The device according to claim 2, characterized in that the adjustment coefficient determining unit is specifically configured to:
and determining the pixel adjustment coefficient according to the refresh rate and the corresponding relation between the preset refresh rate and the pixel adjustment coefficient.
5. The apparatus according to any of claims 1 to 4, characterized in that the image processing unit is specifically configured to:
and multiplying the pixel value of each pixel point in each frame of video data corresponding to the refresh rate by the pixel adjustment coefficient.
6. The device according to any of claims 1 to 4, wherein the refresh rate monitoring unit is specifically configured to:
and determining the refresh rate according to the field synchronization signal corresponding to each video frame in the video data to be displayed.
7. A method for controlling a display, comprising:
obtaining a refresh rate corresponding to video data to be displayed;
determining a pixel adjustment coefficient according to the refresh rate;
performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient;
and 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.
8. The method of claim 7, wherein determining pixel adjustment coefficients based on the refresh rate comprises:
according to the refresh rate F and formula
Calculating to obtain the highest light transmittance H corresponding to the refresh rate F;
the highest light transmittance H corresponding to the default refresh rate is obtained0The ratio of (a) to (b) is used as the pixel adjustment coefficient K;
wherein,
and tr is the average light transmittance corresponding to the default refresh rate, and is the response time of the display screen.
9. The method of claim 7, wherein determining pixel adjustment coefficients based on the refresh rate comprises:
and determining the pixel adjustment coefficient according to the refresh rate and the corresponding relation between the preset refresh rate and the pixel adjustment coefficient.
10. The method according to any one of claims 7 to 9, wherein the performing pixel processing on each frame of video data corresponding to the refresh rate according to the pixel adjustment coefficient includes:
and multiplying the pixel value of each pixel point in each frame of video data corresponding to the refresh rate by the pixel adjustment coefficient.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010483467.1A CN113763904A (en) | 2020-06-01 | 2020-06-01 | Display device and display control method |
| PCT/CN2021/081917 WO2021238362A1 (en) | 2020-05-26 | 2021-03-19 | Display apparatus |
| PCT/CN2021/081883 WO2021238361A1 (en) | 2020-05-26 | 2021-03-19 | Display device and display control method |
| US17/808,041 US11830446B2 (en) | 2020-05-26 | 2022-06-21 | Display apparatus and display control method |
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| CN202010483467.1A CN113763904A (en) | 2020-06-01 | 2020-06-01 | Display device and display control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114187867A (en) * | 2021-12-10 | 2022-03-15 | 北京欧铼德微电子技术有限公司 | Display brightness control method and device and electronic equipment |
| CN114222157A (en) * | 2021-12-22 | 2022-03-22 | 厦门视诚科技有限公司 | Multi-input signal portable broadcasting and stream pushing pre-monitoring system |
| CN116092452A (en) * | 2023-01-05 | 2023-05-09 | 荣耀终端有限公司 | Refresh rate switching method and electronic device |
-
2020
- 2020-06-01 CN CN202010483467.1A patent/CN113763904A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114187867A (en) * | 2021-12-10 | 2022-03-15 | 北京欧铼德微电子技术有限公司 | Display brightness control method and device and electronic equipment |
| CN114222157A (en) * | 2021-12-22 | 2022-03-22 | 厦门视诚科技有限公司 | Multi-input signal portable broadcasting and stream pushing pre-monitoring system |
| CN114222157B (en) * | 2021-12-22 | 2024-05-10 | 厦门视诚科技有限公司 | Multi-input signal portable pilot broadcast plug flow pre-monitoring system |
| CN116092452A (en) * | 2023-01-05 | 2023-05-09 | 荣耀终端有限公司 | Refresh rate switching method and electronic device |
| CN116092452B (en) * | 2023-01-05 | 2023-10-20 | 荣耀终端有限公司 | Refresh rate switching method and electronic device |
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