CN114387929A - Display panel driving method and display device - Google Patents

Display panel driving method and display device Download PDF

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Publication number
CN114387929A
CN114387929A CN202210064303.4A CN202210064303A CN114387929A CN 114387929 A CN114387929 A CN 114387929A CN 202210064303 A CN202210064303 A CN 202210064303A CN 114387929 A CN114387929 A CN 114387929A
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Prior art keywords
display panel
brightness
display
backlight module
target
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CN202210064303.4A
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CN114387929B (en
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杨涛
陈东川
廖燕平
杨越
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/3413Details of control of colour illumination sources
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The embodiment of the disclosure discloses a driving method of a display panel and a display device, when the display panel is at different refreshing frequencies, in a data refreshing stage of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be a first target brightness, and controlling sub-pixel input data voltage in the display panel; wherein the first target brightness is greater than the default brightness; and/or when the display panel is at different refreshing frequencies, in a blank time stage of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be a second target brightness, and controlling the sub-pixels in the display panel to keep the data voltage; wherein the second target brightness is less than the default brightness. This can improve the flicker phenomenon.

Description

Display panel driving method and display device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method of a display panel and a display device.
Background
In a Display such as a Liquid Crystal Display (LCD), a plurality of pixels are generally included. Each pixel may include: red, green, and blue sub-pixels. The display brightness of each sub-pixel is controlled by controlling the display data corresponding to each sub-pixel, so that the colors required to be displayed are mixed to display a color image.
Disclosure of Invention
The driving method of the display panel and the display device provided by the embodiment of the disclosure can reduce the display brightness difference under different refresh frequencies and improve the flicker problem.
The driving method of the display panel provided by the embodiment of the present disclosure includes:
when the display panel is at different refreshing frequencies, in a data refreshing stage of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be a first target brightness, and controlling sub-pixels in the display panel to input data voltages; wherein the first target brightness is greater than a default brightness;
and/or when the display panel is at different refresh frequencies, in a blank time period of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be a second target brightness, and controlling sub-pixels in the display panel to keep a data voltage; wherein the second target brightness is less than the default brightness.
In some examples, the brightness of the backlight module is controlled by a pulse width modulation signal;
the duty ratio of the pulse width modulation signal corresponding to the first target brightness is larger than the duty ratio of the pulse width modulation signal corresponding to the default brightness.
In some examples, the larger the refresh frequency of the display panel, the larger the first target brightness, and the larger the duty cycle of the brightness control signal.
In some examples, the first target brightness is the same when the display panel is at different refresh frequencies.
In some examples, in the blank time period of each display frame, the second target brightness of the backlight module of the display panel is controlled to be reduced in sequence.
In some examples, in the blank time period of each display frame, the second target brightness of the backlight module controlling the display panel is sequentially reduced in a step manner.
In some examples, the luminances of the second target luminance corresponding to the same order step are the same at different refresh frequencies.
In some examples, in the blank time period of each display frame, the second target brightness of the backlight module controlling the display panel is sequentially reduced in a linear manner.
In some examples, the brightness of the backlight module is controlled by a pulse width modulation signal;
the duty ratio of the pulse width modulation signal corresponding to the second target brightness is smaller than the duty ratio of the pulse width modulation signal corresponding to the default brightness.
In some examples, in the data refresh phase of at least one display frame, when controlling the light-emitting luminance of the backlight module of the display panel to be a first target luminance and controlling the sub-pixels in the display panel to input the data voltage, the method further includes:
and in the blank time period of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be the default brightness, and controlling the sub-pixels in the display panel to keep the data voltage.
In some examples, when the controlling the light-emitting brightness of the backlight module of the display panel to be the second target brightness and the controlling the sub-pixels in the display panel to maintain the data voltage in the blank time period of at least one of the display frames further includes:
and in the data refreshing stage of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be the default brightness, and controlling the sub-pixel input data voltage in the display panel.
In some examples, the data refresh phase is triggered by a frame start signal;
when the setting edge of the frame starting signal appears, controlling the light-emitting brightness of a backlight module of the display panel to be first target brightness; wherein the set edge is a rising edge or a falling edge.
The display device provided by the embodiment of the disclosure comprises:
a display panel;
a timing controller configured to control sub-pixels in the display panel to input data voltages in a data refresh phase of at least one display frame when the display panel is at different refresh frequencies;
and/or, when the display panel is at different refresh frequencies, in the blank time period of at least one display frame, controlling the sub-pixels in the display panel to maintain the data voltage;
the backlight control circuit is configured to control the light-emitting brightness of the backlight module of the display panel to be first target brightness in the data refreshing stage of at least one display frame when the display panel is at different refreshing frequencies; wherein the first target brightness is greater than a default brightness;
and/or when the display panel is at different refreshing frequencies, controlling the light-emitting brightness of the backlight module of the display panel to be a second target brightness in the blank time stage of at least one display frame; wherein the second target brightness is less than the default brightness.
In some examples, the timing controller is further configured to generate a frame start signal and to enter the data refresh phase triggered by the frame start signal;
the backlight control circuit is further configured to control the light-emitting brightness of the backlight module of the display panel to be a first target brightness when the set edge of the frame start signal is detected to appear.
The beneficial effects of the disclosed embodiment are as follows:
according to the driving method provided by the embodiment of the disclosure, the display brightness difference under different refresh frequencies can be reduced by adjusting the brightness, and the flicker problem is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display device in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a display panel in an embodiment of the disclosure;
FIG. 3 is a schematic timing diagram of some signals in an embodiment of the present disclosure;
FIG. 4 is a schematic timing diagram of other signals in an embodiment of the present disclosure;
FIG. 5 is a flow chart of some driving methods in an embodiment of the present disclosure;
FIG. 6 is a schematic timing diagram of still other signals in the disclosed embodiments;
FIG. 7 is a schematic timing diagram of still other signals in the disclosed embodiment;
FIG. 8 is a flow chart of other actuation methods in embodiments of the present disclosure;
FIG. 9 is a schematic timing diagram of still other signals in the disclosed embodiments;
FIG. 10 is a schematic timing diagram of still other signals in the disclosed embodiments;
FIG. 11 is a flow chart of yet another drive method in an embodiment of the present disclosure;
FIG. 12 is a schematic timing diagram of still other signals in the disclosed embodiments;
FIG. 13 is a timing diagram of some other signals according to the embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. And the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the various figures in the drawings are not to scale, but are merely intended to illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
Referring to fig. 1 and 2, the display device may include: the display device includes a display panel 100, a timing controller 200, a graphic processor 300, a backlight module 400 and a backlight control circuit. The display panel 100 may include a plurality of pixel units arranged in an array, a plurality of gate lines GA (e.g., GA1, GA2, GA3, and GA4), a plurality of data lines DA (e.g., DA1, DA2, and DA3), a gate driving circuit 110, and a source driving circuit 120. The gate driving circuit 110 is coupled to the gate lines GA1, GA2, GA3, and GA4, respectively, and the source driving circuit 120 is coupled to the data lines DA1, DA2, and DA3, respectively. The backlight control circuit may generate a Pulse Width Modulation (PWM) signal to control the brightness of the backlight module 400 through the PWM signal, so as to provide a light source for the display panel. The graphic processor 300 may receive display data of an image to be displayed for one display frame and then render the display data. After the graphics processor 300 finishes rendering the display data of the image to be displayed, the display data of the display frame is immediately sent to the timing controller. The timing controller 200 may input a control signal to the gate driving circuit 110 through a Level Shift circuit, thereby driving the gate lines GA1, GA2, GA3, GA 4. The timing controller 200 inputs a signal to the source driving circuit 120 to enable the source driving circuit 120 to input a data voltage to the data line, thereby charging the sub-pixel SPX and enabling the sub-pixel SPX to input a corresponding data voltage to implement a picture display function of the display frame. For example, the source driving circuits 120 may be arranged in 2, wherein one source driving circuit 120 is connected to half of the number of data lines, and the other source driving circuit 120 is connected to the other half of the number of data lines. Of course, the number of the source driving circuits 120 may also be 3, 4, or more, and the source driving circuits may be designed according to the requirements of the practical application, and are not limited herein.
Illustratively, each pixel unit includes a plurality of sub-pixels SPX. For example, the pixel unit may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, so that color mixing may be performed by red, green, and blue to realize color display. Alternatively, the pixel unit may also include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, so that color display may be realized by performing color mixing of red, green, blue, and white. Of course, in practical applications, the light emitting color of the sub-pixels in the pixel unit may be determined according to practical application environments, and is not limited herein.
As shown in fig. 2, each sub-pixel SPX includes a transistor 01 and a pixel electrode 02 therein. The sub-pixels SPX in one row correspond to a gate line, and the sub-pixels SPX in one column correspond to a data line. The gate of the transistor 01 is electrically connected to the corresponding gate line, the source of the transistor 01 is electrically connected to the corresponding data line, and the drain of the transistor 01 is electrically connected to the pixel electrode 02. it should be noted that the pixel array structure of the present disclosure may also be a dual-gate structure, that is, two gate lines are disposed between two adjacent rows of pixels, and this arrangement mode may reduce half of the data lines, that is, include data lines between two adjacent rows of pixels, and some adjacent rows of pixels do not include data lines, and the specific pixel arrangement structure and data lines, and the arrangement mode of the scan lines is not limited.
It should be noted that the display panel in the embodiment of the present disclosure may be a liquid crystal display panel. Illustratively, a liquid crystal display panel generally includes upper and lower substrates facing each other, and liquid crystal molecules encapsulated between the upper and lower substrates. When a picture is displayed, a voltage difference exists between the data voltage applied to the pixel electrode of each sub-pixel SPX and the common electrode voltage applied to the common electrode, and the voltage difference can form an electric field, so that liquid crystal molecules are deflected by the electric field. The electric fields with different intensities enable the deflection degrees of the liquid crystal molecules to be different, so that the transmittance of the sub-pixel SPX is different, the sub-pixel SPX can realize the brightness with different gray scales, and further, the picture display is realized.
The gray scale is generally divided into several parts of the brightness variation between the darkest and the brightest so as to control the brightness of the screen. For example, the displayed image is composed of three colors of red, green and blue, each of which can show different brightness levels, and the red, green and blue of different brightness levels can be combined to form different colors. For example, if the gray scale bit number of the liquid crystal display panel is 6 bits, the three colors of red, green and blue have 64 (i.e. 2)6) The 64 gray levels are 0-63, respectively. The gray scale bit number of the LCD panel is 8 bits, and the three colors of red, green and blue have 256 (2)8) The 256 gray levels are 0-255. The gray scale bit number of the LCD panel is 10bit, and the three colors of red, green and blue are 1024 (i.e. 2)10) The 1024 gray levels are 0 to 1023 respectively. The gray scale bit number of the LCD panel is 12bit, and the three colors of red, green and blue have 4096 (2)12) And the 4096 gray levels are 0-4093 gray levels respectively.
Referring to fig. 3, taking a sub-pixel SPX as an example, Vcom represents the common electrode voltage. When the data voltage inputted to the pixel electrode of the sub-pixel SPX is greater than the common electrode voltage Vcom, the liquid crystal molecules at the sub-pixel SPX may be made to have positive polarity, and the polarity corresponding to the data voltage at the sub-pixel SPX is positive polarity. When the data voltage inputted to the pixel electrode of the sub-pixel SPX is less than the common electrode voltage Vcom, the liquid crystal molecules at the sub-pixel SPX may be made to be negative, and the polarity corresponding to the data voltage at the sub-pixel SPX is negative. For example, the common electrode voltage may be 8.3V, and if the data voltage of 8.3V to 16V is input to the pixel electrode of the subpixel SPX, and the liquid crystal molecules in the subpixel SPX may have a positive polarity, the data voltage of 8.3V to 16V is a data voltage corresponding to the positive polarity. When the data voltage of 0.6V to 8.3V is input to the pixel electrode of the subpixel SPX, and the liquid crystal molecules in the subpixel SPX can be made to have a negative polarity, the data voltage of 0.6V to 8.3V corresponds to the negative polarity. For example, taking 0-255 grayscales of 8 bits as an example, if a data voltage of 16V is input to the pixel electrode of the sub-pixel SPX, the sub-pixel SPX may correspond to the luminance of the maximum grayscale value with positive polarity. When a data voltage of 0.6V is input to the pixel electrode of the subpixel SPX, the subpixel SPX may correspond to a luminance of a maximum gray scale value of a negative polarity.
Referring to fig. 2 and fig. 3, a display frame F0 of the display panel may include a data refresh period TS and a blank Time period TB, taking frame inversion (also referred to as dot inversion, column inversion, row inversion, etc.) as an example. In the data refresh period TS, the backlight module 400 of the display panel is controlled to emit light, and the sub-pixels in the display panel are controlled to input data voltages, so that the display panel displays the picture of the display frame F0. Specifically, as shown in fig. 3, when a signal GA1 is applied to the gate line GA1, a signal GA2 is applied to the gate line GA2, a signal GA3 is applied to the gate line GA3, a signal GA4 is applied to the gate line GA4, and a gate-on voltage (for example, a voltage corresponding to a high level) appears in the signals GA1 to GA4, the corresponding transistor 01 can be controlled to be turned on. When a gate-on voltage is applied to the signal ga1, the transistors 01 in the first row of sub-pixels are all controlled to be turned on, and a corresponding data voltage DA1 is applied to the data line DA1, a corresponding data voltage DA2 is applied to the data line DA2, and a corresponding data voltage DA3 is applied to the data line DA3, so that the pixel electrodes 02 in the first row of sub-pixels input corresponding data voltages, and each sub-pixel in the first row inputs a data voltage. When the gate-on voltage is applied to the signal ga2, the transistors 01 in the sub-pixels in the second row are all controlled to be turned on, and a corresponding data voltage DA1 is applied to the data line DA1, a corresponding data voltage DA2 is applied to the data line DA2, and a corresponding data voltage DA3 is applied to the data line DA3, so that the pixel electrodes 02 in the sub-pixels in the second row input corresponding data voltages, and each sub-pixel in the second row inputs a data voltage. When the gate-on voltage is present in the signal ga3, the transistors 01 in the third row of sub-pixels can be controlled to be turned on, and the data line DA1 is applied with the corresponding data voltage DA1, the data line DA2 is applied with the corresponding data voltage DA2, and the data line DA3 is applied with the corresponding data voltage DA3, so that the pixel electrodes 02 in the third row of sub-pixels input the corresponding data voltages, and each sub-pixel in the third row inputs the data voltage. When the gate-on voltage is present in the signal ga4, the transistors 01 in the fourth row of sub-pixels can be controlled to be all turned on, and the data line DA1 is applied with the corresponding data voltage DA1, the data line DA2 is applied with the corresponding data voltage DA2, and the data line DA3 is applied with the corresponding data voltage DA3, so that the pixel electrode 02 in the fourth row of sub-pixels inputs the corresponding data voltage, and each sub-pixel in the fourth row inputs the data voltage. The rest can be analogized, and the description is omitted here.
As shown in fig. 3, in a blank Time period TB, signals ga1 to ga4 are all low, the transistor 01 in each sub-pixel is in an off state, and the pixel electrode 02 in each sub-pixel is controlled to maintain the data voltage, so that the sub-pixels in the display panel are controlled to maintain the data voltage. And, the backlight module 400 of the display panel is controlled to emit light, so that the display panel continues to display the picture of the display frame F0.
To achieve different application scenarios, the display panel may set a number of different refresh frequencies. For example, in some application scenarios, in order to save power consumption, the display panel needs to display in a down-conversion mode, for example: from 60HZ to 30 HZ. In other scenarios, for example: when a high frequency game is executed, it is necessary to increase the frequency of the display panel, for example: the picture is smoother by increasing from 60HZ to 90HZ or 120 HZ. Therefore, in order to be suitable for different scenes, the display panel may change the display frequency, i.e., dynamic frame rate display. In general, when the refresh frequency of the display panel is changed from a high frequency to a low frequency, the duration of the data refresh period TS in one display frame is not changed, but simply extends the blank time period TB in the time sequence in one display frame. For example, as shown in fig. 4, the refresh frequency corresponding to the display frame F1 is greater than the refresh frequency corresponding to the display frame F2, and the refresh frequency corresponding to the display frame F2 is greater than the refresh frequency corresponding to the display frame F3. The sustain durations of the data refresh period TS in the display frame F1, the display frame F2, and the display frame F3 are the same. The sustain duration of the blank time period TB in the display frame F1 is greater than that of the blank time period TB in the display frame F2, and the sustain duration of the blank time period TB in the display frame F2 is greater than that of the blank time period TB in the display frame F3. In fig. 4, LS represents the brightness of the display panel, and DA1 represents the data voltage on the data line DA 1.
Therefore, the display panel displays the picture of one display frame until the display data of the next display frame is received for refreshing. The duration of time for which the display panel displays a picture of one display frame may include two phases, a data refresh phase TS and a blank time phase TB. The maintaining time lengths of the data refreshing time in the display frame are the same under different refreshing frequencies, and the maintaining time lengths of the blank time period TB in the display frame are different under different refreshing frequencies. A data refresh period TS and a blank time period TB constitute the total time of a display frame. In the data refresh period TS, the brightness of the display screen of the display panel will first decrease and then increase. In the blank time period TB, the brightness of the display screen of the display panel is substantially unchanged. The average brightness of a display frame is different for different refresh frequencies (e.g., the average brightness of the picture at low frequencies is higher than the average brightness of the picture at high frequencies). As shown in fig. 4, the average luminance L01 corresponding to the display frame F1 is greater than the average luminance L02 corresponding to the display frame F2, and the average luminance L02 corresponding to the display frame F2 is greater than the average luminance L03 corresponding to the display frame F3. However, in practical applications, since the refresh frequency changes continuously, the brightness of the display panel also changes continuously, and a flicker (flicker) phenomenon is easily observed by human eyes, which affects the appearance. The embodiment of the disclosure provides a driving method of a display panel, which can solve the problem of different brightness of a display picture under different refreshing frequencies, improve a flicker phenomenon, and improve display quality and viewing experience.
As shown in fig. 5, a method for driving a display panel according to an embodiment of the present disclosure may include:
s110, when the display panel is at different refreshing frequencies, in a data refreshing stage of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be a first target brightness, and controlling the sub-pixels in the display panel to input data voltages. Illustratively, when the display panel is at different refresh frequencies, in the data refresh period TS of each display frame, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be a first target brightness, and the sub-pixel input data voltage in the display panel is controlled. Wherein the first target brightness is greater than the default brightness BLS 0. In the embodiment of the disclosure, the light output brightness of the backlight module 400 has the default brightness BLS 0. The default brightness BLS0 may be a brightness determined before the backlight module 400 is shipped.
And S120, when the display panel is at different refreshing frequencies, in a blank time period of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be default brightness, and controlling the sub-pixels in the display panel to keep data voltage. Illustratively, when the display panel is at different refresh frequencies, in the blank time period TB of each display frame, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the default brightness BLS0, and the sub-pixels in the display panel are controlled to maintain the data voltage.
Referring to fig. 6, LS represents the brightness of the display panel, L11 represents the average brightness of the display panel at the refresh frequency corresponding to the display frame F1, L12 represents the average brightness of the display panel at the refresh frequency corresponding to the display frame F2, L13 represents the average brightness of the display panel at the refresh frequency corresponding to the display frame F3, and DA1 represents the data voltage on the data line DA 1. The driving method provided by the embodiment of the disclosure can control the light-emitting brightness of the backlight module 400 of the display panel to be the first target brightness in the data refreshing stage TS of the display frame, and the first target brightness is greater than the default brightness BLS0, that is, the backlight brightness of the display panel in the data refreshing stage TS is increased, so that the brightness of the display panel in the data refreshing stage TS has a fluctuation that decreases first and then increases. This compensates for the brightness drop caused by the data refresh, thereby reducing the panel brightness difference at different refresh frequencies. In the blank time period TB, the brightness of the backlight module 400 may be set to an original value, i.e., the default brightness BLS 0. Because the backlight brightness at different refresh frequencies is basically the same in the blank time period TB, and the backlight brightness compensation is improved in the data refresh period TS, the brightness difference from the blank time period TB can be reduced, so that the average brightness L11 when the display frame F1 displays a picture, the average brightness L12 when the display frame F2 displays a picture, and the average brightness L13 when the display frame F3 displays a picture of the display panel can be made as the same as possible, thereby reducing the display brightness difference at different refresh frequencies and improving the flicker problem.
Alternatively, as shown in conjunction with fig. 6, the average luminances L11, L12, L13 shown by the dotted lines may coincide with the luminances corresponding to the solid lines in the TB stage. Of course, in practical applications, the average luminances L11, L12, and L13 shown by the dashed lines may have a certain threshold (i.e., an error tolerance) with respect to the luminances corresponding to the solid lines in the TB stage, but do not affect the display quality.
In the embodiment of the present disclosure, the timing controller may control the sub-pixel input data voltages in the display panel in the data refresh period TS of at least one (e.g., every) display frame when the display panel is at different refresh frequencies. Moreover, the backlight control circuit may control the light-emitting brightness of the backlight module 400 of the display panel to be the first target brightness in the data refresh period TS of at least one (e.g., every) display frame when the display panel is at different refresh frequencies. And, the timing controller may control the subpixels in the display panel to maintain the data voltages during the blank time period TB of at least one (e.g., each) display frame when the display panel is at the different refresh frequencies. Moreover, the backlight control circuit may control the light-emitting brightness of the backlight module 400 of the display panel to be the default brightness BLS0 in the blank time period TB of at least one (e.g., each) display frame when the display panel is at different refresh frequencies.
In the embodiment of the disclosure, as shown in fig. 6, the timing controller may generate a frame start signal STV, and the data refresh period TS in each display frame is triggered by the frame start signal STV, that is, the data refresh period TS is triggered by the frame start signal STV. For example, when a falling edge of the frame start signal STV comes, the display frame F1 enters the data refresh period TS. When the next falling edge of the frame start signal STV comes, the display frame F2 enters the data refresh phase TS. When the next falling edge of the frame start signal STV arrives, the display frame F3 enters the data refresh period TS. Alternatively, when a rising edge of the frame start signal STV comes, the display frame F1 enters the data refresh period TS. When the next rising edge of the frame start signal STV arrives, the display frame F2 enters the data refresh phase TS. When the next rising edge of the frame start signal STV arrives, the display frame F3 enters the data refresh period TS.
In the embodiment of the disclosure, when the backlight control circuit 500 detects that the setting edge of the frame start signal STV occurs, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness. Illustratively, the set edge may be a falling edge. When the falling edge of the frame start signal STV occurs, the light emitting brightness of the backlight module 400 of the display panel may be controlled to be the first target brightness. For example, when a falling edge of the frame start signal STV arrives, the display frame F1 enters the data refresh period TS, and the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 11. When the next falling edge of the frame start signal STV arrives, the display frame F2 enters the data refresh period TS, and the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 12. When the next falling edge of the frame start signal STV arrives, the display frame F3 enters the data refresh period TS, and the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 13.
In the embodiment of the disclosure, when the backlight control circuit 500 detects that the setting edge of the frame start signal STV occurs, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness. Illustratively, the set edge may be a rising edge. When the rising edge of the frame start signal STV occurs, the light emitting brightness of the backlight module 400 of the display panel can be controlled to be the first target brightness. For example, when a rising edge of the frame start signal STV arrives, the display frame F1 enters the data refresh period TS, and the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 11. When the next rising edge of the frame start signal STV arrives, the display frame F2 enters the data refresh period TS, and the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 12. When the next rising edge of the frame start signal STV arrives, the display frame F3 enters the data refresh period TS, and the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 13.
In the embodiment of the disclosure, the light-emitting brightness of the backlight module is controlled to be the first target brightness from the start time to the end time of the data refreshing stage in each display frame.
In the embodiment of the disclosure, the brightness of the backlight module 400 may be controlled by a pulse width modulation signal. The duty cycle of the pulse width modulated signal corresponding to the first target brightness is greater than the duty cycle of the pulse width modulated signal corresponding to the default brightness BLS 0. I.e. the brightness of the backlight is proportional to the pulse width of the pulse width modulated signal. When the backlight control circuit detects the set edge of the STV signal, the pulse width of the pulse width modulation signal is increased, and after a data refreshing stage TS, the pulse width of the pulse width modulation signal is restored to the original value. For example, as shown in fig. 6, in the PWM signal PWM1, in the display frame F1, the duty ratio of the first target luminance BLS11 corresponding to the data refresh period TS is greater than the duty ratio of the default luminance BLS0 corresponding to the blank time period TB. Also, in the display frame F2, the duty ratio of the first target luminance BLS12 corresponding to the data refresh period TS is greater than the duty ratio of the default luminance BLS0 corresponding to the blank time period TB. And, at the display frame F3, the duty ratio of the first target luminance BLS13 corresponding to the data refresh period TS is greater than the duty ratio of the default luminance BLS0 corresponding to the blank time period TB. It should be noted that the duty ratio is a percentage of the duration of the high level in one period.
In the embodiment of the present disclosure, the first target brightness may be made the same when the display panel is at different refresh frequencies. For example, as shown in fig. 6, the first target luminance BLS11 of the display frame F1, the first target luminance BLS12 of the display frame F2, and the first target luminance BLS13 of the display frame F3 are the same. In the pulse width modulation signal PWM1, the duty ratio corresponding to the first target luminance BLS11 in the display frame F1, the duty ratio corresponding to the first target luminance BLS12 in the display frame F2, and the duty ratio corresponding to the first target luminance BLS13 in the display frame F3 are also the same. In the pulse width modulation signal PWM1, the duty ratio corresponding to the default luminance BLS0 of the display frame F1, the duty ratio corresponding to the default luminance BLS0 of the display frame F2, and the duty ratio corresponding to the default luminance BLS0 of the display frame F3 are also the same. In fig. 6, BS1 represents the light emitting brightness of the backlight module 400, and PWM1 represents the pulse width modulation signal.
In the embodiment of the present disclosure, the first target luminance may be made larger and the duty ratio of the luminance control signal may be made larger as the refresh frequency of the display panel is larger. For example, as shown in fig. 7, the first target luminance BLS21 of the display frame F1 is greater than the first target luminance BLS22 of the display frame F2, and the first target luminance BLS22 of the display frame F2 is greater than the first target luminance BLS23 of the display frame F3. The same applies to the default luminance BLS0 for the display frame F1, the default luminance BLS0 for the display frame F2, and the default luminance BLS0 for the display frame F3. And in the pulse width modulation signal PWM2, the duty ratio corresponding to the first target brightness BLS21 of the display frame F1 is greater than the duty ratio corresponding to the first target brightness BLS22 of the display frame F2, and the duty ratio corresponding to the first target brightness BLS22 of the display frame F2 is greater than the duty ratio corresponding to the first target brightness BLS23 of the display frame F3. In the pulse width modulation signal PWM2, the duty ratio corresponding to the default luminance BLS0 of the display frame F1, the duty ratio corresponding to the default luminance BLS0 of the display frame F2, and the duty ratio corresponding to the default luminance BLS0 of the display frame F3 are also the same. In fig. 7, BS2 represents the light output brightness of the backlight module 400, and PWM2 represents the pulse width modulation signal.
The embodiments of the present disclosure provide other driving methods of a display panel, as shown in fig. 8, which are modified from the embodiments in the above embodiments. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.
As shown in fig. 8, the driving method of another display panel provided by the embodiment of the present disclosure may include the following steps:
s210, when the display panel is at different refreshing frequencies, in a data refreshing stage of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be default brightness, and controlling the sub-pixels in the display panel to input data voltages. For example, when the display panel is at different refresh frequencies, in the data refresh period TS of each display frame, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the default brightness BLS0, and the sub-pixel input data voltage in the display panel is controlled.
And S220, when the display panel is at different refreshing frequencies, in a blank time period of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be a second target brightness, and controlling the sub-pixels in the display panel to keep the data voltage. Illustratively, when the display panel is at different refresh frequencies, in the blank time period TB of each display frame, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness, and the sub-pixels in the display panel are controlled to maintain the data voltage. Wherein the second target brightness is less than the default brightness BLS 0.
Referring to fig. 9 and 10, LS represents the brightness of the display panel, DA1 represents the data voltage on the data line DA1, and BS3 and BS4 represent the brightness of the backlight module 400. The driving method provided by the embodiment of the present disclosure can control the light-emitting brightness of the backlight module 400 of the display panel to be the default brightness BLS0 in the data refresh period TS of the display frame. In the blank time period TB, the brightness of the backlight assembly 400 may be set to a second target brightness less than the default brightness BLS 0. Since the sustain duration of the blank time period TB of the display frame F1 is greater than that of the display frame F2, the luminance of the display frame F1 in the blank time period TB may be less than that of the display frame F2 in the blank time period TB, so that the average luminance in the display frame F1 may be made as the same as the average luminance in the display frame F2 as possible. Likewise, since the duration of the blank time period TB of the display frame F2 is greater than the duration of the blank time period TB of the display frame F3, the luminance of the display frame F2 in the blank time period TB may be less than the luminance of the display frame F3 in the blank time period TB, so that the average luminance in the display frame F2 may be as same as the average luminance in the display frame F3 as possible. Therefore, the difference of the panel brightness under different refreshing frequencies can be reduced, and the flicker problem is improved.
In the embodiment of the disclosure, in the blank time period TB of each display frame, the second target brightness of the backlight module 400 of the display panel is controlled to be decreased in sequence. For example, as shown in fig. 9, in the blank time period TB of the display frame F1, the second target brightness is sequentially decreased. In the blank time period TB of the display frame F2, the second target brightness also decreases in sequence. In the blank time period TB of the display frame F3, the second target brightness also decreases in sequence.
In the embodiment of the disclosure, in the blank time period TB of each display frame, the second target brightness of the backlight module 400 controlling the display panel is sequentially decreased in a step manner. Illustratively, in the blank time period TB of each display frame, the second target brightness of the backlight module 400 controlling the display panel is sequentially decreased in a stepwise manner by the same difference. For example, in each blank time period, the brightness of the light emitted from the backlight module can be reduced by k every ts, wherein ts is more than or equal to 0 and less than or equal to tTSThe value of k is set according to the brightness difference result of different refresh rates in actual test, tTSRepresenting the total sustain duration of the data refresh phase. For example, as shown in fig. 9, in the blank time period TB of the display frame F1, the second target luminances BLS011 through BLS016 are sequentially decreased in a stepwise manner. In the blank time period TB of the display frame F2, the second target luminances BLS021 to BLS024 are also sequentially decreased in a stepwise manner. In the blank time period TB of the display frame F3, the second target luminances BLS031 through BLS032 are also sequentially decreased in a stepwise manner. In fig. 9, BS3 represents the light output brightness of the backlight module 400.
In the embodiment of the disclosure, the brightness corresponding to the same order step in the second target brightness is the same under different refresh frequencies. For example, as shown in fig. 9, when the second target luminance BLS011, the second target luminance BLS021 and the second target luminance BLS031 are luminance corresponding to the same sequential steps in different refresh frequencies, the second target luminance BLS011, the second target luminance BLS021 and the second target luminance BLS031 are the same. The second target luminances BLS012, BLS022 and BLS032 are luminances corresponding to the same order step in different refresh frequencies, and then the second target luminances BLS012, BLS022 and BLS032 are the same. The second target luminance BLS013 and the second target luminance BLS023 are luminances corresponding to the same order step in different refresh frequencies, and the second target luminance BLS013 and the second target luminance BLS023 are the same. The second target brightness BLS014 and the second target brightness BLS024 are brightness corresponding to the same sequential step in different refresh frequencies, and the second target brightness BLS014 and the second target brightness BLS024 are the same.
In the embodiment of the present disclosure, the second target brightness of the backlight module 400 controlling the display panel may be sequentially decreased in a linear manner in the blank time period TB of each display frame. Illustratively, in the blank time period TB of each display frame, the second target brightness of the backlight assembly 400 controlling the display panel is sequentially decreased in a linear manner with the same slope. For example, as shown in fig. 10, in the blank time period TB of the display frame F1, the second target luminance BLS010 is sequentially decreased in a linear manner. In the blank time period TB of the display frame F2, the second target brightness BLS020 is sequentially decreased in a linear manner. In the blank time period TB of the display frame F3, the second target brightness BLS030 is sequentially decreased in a linear manner. In fig. 10, BS4 represents the light output brightness of the backlight module 400.
In the disclosed embodiment, the duty cycle of the pulse width modulated signal corresponding to the second target brightness may be less than the duty cycle of the pulse width modulated signal corresponding to the default brightness BLS 0. For example, in the pulse width modulation signal PWM, in the display frame F1, the duty ratio corresponding to the second target brightness is smaller than the duty ratio corresponding to the default brightness BLS 0. Also, in the display frame F2, the duty ratio corresponding to the second target luminance is smaller than the duty ratio corresponding to the default luminance BLS 0. And, at the display frame F3, the duty ratio corresponding to the second target brightness is smaller than the duty ratio corresponding to the default brightness BLS 0.
The embodiments of the present disclosure provide still other driving methods of display panels, as shown in fig. 11, which are modified from the embodiments in the above embodiments. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.
As shown in fig. 11, the driving method of still other display panels provided by the embodiments of the present disclosure may include the following steps:
s310, when the display panel is at different refreshing frequencies, in a data refreshing stage of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be a first target brightness, and controlling the sub-pixels in the display panel to input data voltages. Illustratively, when the display panel is at different refresh frequencies, in the data refresh period TS of each display frame, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be a first target brightness, and the sub-pixel input data voltage in the display panel is controlled. Wherein the first target brightness is greater than the default brightness BLS 0. In the embodiment of the disclosure, the light output brightness of the backlight module 400 has the default brightness BLS 0. The default brightness BLS0 may be a brightness determined before the backlight module 400 is shipped.
For example, as shown in fig. 12 and 13, in the data refresh period TS of the display frame F1, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 11. In the data refresh period TS of the display frame F2, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 12. In the data refresh period TS of the display frame F3, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the first target brightness BLS 13.
It should be noted that the implementation of the first target brightness may be substantially the same as that in the above embodiments, and details are not described herein.
And S320, when the display panel is at different refreshing frequencies, in the blank time period of at least one display frame, controlling the light-emitting brightness of the backlight module of the display panel to be a second target brightness, and controlling the sub-pixels in the display panel to keep the data voltage. Illustratively, when the display panel is at different refresh frequencies, in the blank time period TB of each display frame, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness, and the sub-pixels in the display panel are controlled to maintain the data voltage. Wherein the second target brightness is less than the default brightness BLS 0.
For example, referring to fig. 12, in the blank time period TB of the display frame F1, the light emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness BLS011 to BLS 016. In the blank time period TB of the display frame F2, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness BLS021 BLS 024. In the blank time period TB of the display frame F3, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness BLS 031-BLS 032.
Exemplarily, as shown in fig. 13, in the blank time period TB of the display frame F1, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness BLS 010. In the blank time period TB of the display frame F2, the light emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness BLS 020. In the blank time period TB of the display frame F3, the light-emitting brightness of the backlight module 400 of the display panel is controlled to be the second target brightness BLS 030.
It should be noted that the implementation of the second target brightness may be substantially the same as that in the foregoing embodiments, and details are not described here.
The driving method provided by the embodiment of the disclosure can control the light-emitting brightness of the backlight module 400 of the display panel to be the first target brightness in the data refreshing stage TS of the display frame, and the first target brightness is greater than the default brightness BLS0, that is, the backlight brightness of the display panel in the data refreshing stage TS is increased, so that the brightness of the display panel in the data refreshing stage TS has a fluctuation that decreases first and then increases. This compensates for the brightness drop caused by the data refresh, thereby reducing the panel brightness difference at different refresh frequencies. In the blank time period TB, the brightness of the backlight assembly 400 may be set to the second target brightness. Since the sustain duration of the blank time period TB of the display frame F1 is greater than that of the display frame F2, the luminance of the display frame F1 in the blank time period TB may be less than that of the display frame F2 in the blank time period TB, so that the average luminance in the display frame F1 may be made as the same as the average luminance in the display frame F2 as possible. Likewise, since the duration of the blank time period TB of the display frame F2 is greater than the duration of the blank time period TB of the display frame F3, the luminance of the display frame F2 in the blank time period TB may be less than the luminance of the display frame F3 in the blank time period TB, so that the average luminance in the display frame F2 may be as same as the average luminance in the display frame F3 as possible. Therefore, the light emitting brightness of the backlight module 400 in the data refreshing stage TS and the blank time stage TB can be adjusted simultaneously, the difference of the panel brightness under different refreshing frequencies can be reduced, and the flicker problem can be improved.
It will be apparent to those skilled in the art that various changes and modifications can be made in the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.

Claims (14)

1. A method of driving a display panel, comprising:
when the display panel is at different refreshing frequencies, in a data refreshing stage of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be a first target brightness, and controlling sub-pixels in the display panel to input data voltages; wherein the first target brightness is greater than a default brightness;
and/or when the display panel is at different refresh frequencies, in a blank time period of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be a second target brightness, and controlling sub-pixels in the display panel to keep a data voltage; wherein the second target brightness is less than the default brightness.
2. The method for driving a display panel according to claim 1, wherein the brightness of the backlight module is controlled by a pulse width modulation signal;
the duty ratio of the pulse width modulation signal corresponding to the first target brightness is larger than the duty ratio of the pulse width modulation signal corresponding to the default brightness.
3. The method of driving a display panel according to claim 2, wherein the larger the refresh frequency of the display panel, the larger the first target luminance, and the larger the duty ratio of the luminance control signal.
4. The method of driving a display panel according to claim 2, wherein the first target luminance is the same when the display panel is at different refresh frequencies.
5. The method according to any of claims 1 to 4, wherein the second target brightness of the backlight module of the display panel is controlled to be decreased in sequence in the blank time period of each display frame.
6. The method according to claim 5, wherein the second target brightness of the backlight module of the display panel is controlled to be sequentially decreased in a stepwise manner in the blank time period of each of the display frames.
7. The method of driving a display panel according to claim 6, wherein the luminances corresponding to the same sequential step in the second target luminance are the same at different refresh frequencies.
8. The method of claim 5, wherein the second target brightness of the backlight module of the display panel is controlled to decrease sequentially in a linear manner in the blank time period of each display frame.
9. The method for driving a display panel according to claim 5, wherein the brightness of the backlight module is controlled by a pulse width modulation signal;
the duty ratio of the pulse width modulation signal corresponding to the second target brightness is smaller than the duty ratio of the pulse width modulation signal corresponding to the default brightness.
10. The method according to any one of claims 1 to 4, wherein the controlling the output luminance of the backlight module of the display panel to be a first target luminance and the controlling the sub-pixel input data voltage in the display panel in the data refresh phase of at least one display frame further comprises:
and in the blank time period of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be the default brightness, and controlling the sub-pixels in the display panel to keep the data voltage.
11. The method according to any one of claims 1 to 4, wherein the controlling the brightness of the backlight module of the display panel to be a second target brightness and the sub-pixels of the display panel to maintain the data voltage in the blank time period of at least one of the display frames further comprises:
and in the data refreshing stage of at least one display frame, controlling the light-emitting brightness of a backlight module of the display panel to be the default brightness, and controlling the sub-pixel input data voltage in the display panel.
12. The method for driving a display panel according to any one of claims 1 to 4, wherein the data refresh phase is triggered by a frame start signal;
when the setting edge of the frame starting signal appears, controlling the light-emitting brightness of a backlight module of the display panel to be first target brightness; wherein the set edge is a rising edge or a falling edge.
13. A display device, comprising:
a display panel;
a timing controller configured to control sub-pixels in the display panel to input data voltages in a data refresh phase of at least one display frame when the display panel is at different refresh frequencies;
and/or, when the display panel is at different refresh frequencies, in the blank time period of at least one display frame, controlling the sub-pixels in the display panel to maintain the data voltage;
the backlight control circuit is configured to control the light-emitting brightness of the backlight module of the display panel to be first target brightness in the data refreshing stage of at least one display frame when the display panel is at different refreshing frequencies; wherein the first target brightness is greater than a default brightness;
and/or when the display panel is at different refreshing frequencies, controlling the light-emitting brightness of the backlight module of the display panel to be a second target brightness in the blank time stage of at least one display frame; wherein the second target brightness is less than the default brightness.
14. The display device of claim 13, wherein the timing controller is further configured to generate a frame start signal and to enter the data refresh phase triggered by the frame start signal;
the backlight control circuit is further configured to control the light-emitting brightness of the backlight module of the display panel to be a first target brightness when the set edge of the frame start signal is detected to appear.
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