CN113270076A - Display panel driving method and display device - Google Patents
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- CN113270076A CN113270076A CN202110585318.0A CN202110585318A CN113270076A CN 113270076 A CN113270076 A CN 113270076A CN 202110585318 A CN202110585318 A CN 202110585318A CN 113270076 A CN113270076 A CN 113270076A
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- 230000002457 bidirectional effect Effects 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 10
- 230000001808 coupling effect Effects 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 235000019557 luminance Nutrition 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 4
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
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Abstract
The embodiment of the application discloses a driving method of a display panel and a display device, wherein the display panel comprises a plurality of scanning lines, a plurality of data lines and a plurality of sub-pixels distributed in an array; the display panel is provided with a first gray scale picture and a second gray scale picture which are arranged adjacently, and the first gray scale picture is at least positioned on one side of the second gray scale picture in the row direction. The driving method comprises the following steps: setting every two adjacent frame periods as a scanning period, and scanning a plurality of scanning lines line by line in each frame period; wherein, in one scanning period, the scanning directions of two adjacent frame periods are opposite. The display panel and the display method can improve the vertical crosstalk phenomenon of the display panel, so that the display effect of the display panel is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method of a display panel and a display device.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages such as high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel operates on the principle that liquid crystal molecules are filled between a Thin Film Transistor Array (TFT Array Substrate) and a Color Filter (CF) Substrate, and driving voltages are applied to the two substrates to control the rotation direction of the liquid crystal molecules, so that light of the backlight module is refracted out to generate a picture.
In the display process of the TFT-LCD panel, some window frames often appear, such as a User Interface (UI) of a startup frame, a background of a video frame, and the like, so similar window frames are also important standards for detecting image quality in the development process of an actual panel. The window frame is also called a Crosstalk (Crosstalk) frame, and as in the display panel 10 shown in fig. 1, the background frame 11 is disposed around the middle window frame 12, and the gray scale values of the background frame 11 and the window frame 12 are different, for example, the background frame 11 is a 64-step gray frame, and the window frame 12 is a 255-step yellow frame with a single color or a mixed color. The degree of Crosstalk can be defined by measuring the variation of the luminance (chrominance) of the background frame 11 above and below the window frame 12. When the degree of Crosstalk is large, the vertical Crosstalk phenomenon of the display panel can be caused, and the display effect is influenced.
Disclosure of Invention
The application provides a driving method of a display panel and a display device, wherein the scanning directions of two adjacent frame time intervals are set to be opposite directions, so that the vertical crosstalk phenomenon of the display panel is improved, and the display effect of the display panel is improved.
The application provides a driving method of a display panel, wherein the display panel comprises a plurality of scanning lines which extend in a row direction and are arranged in parallel and a plurality of data lines which extend in a column direction and are arranged in parallel; the plurality of scanning lines and the plurality of data lines are insulated and intersected to define a plurality of sub-pixels distributed in an array; the display panel is provided with a first gray scale picture and a second gray scale picture which are arranged adjacently, and the first gray scale picture is at least positioned on one side of the second gray scale picture in the row direction;
the driving method includes the steps of:
setting every two adjacent frame periods as a scanning period, and scanning the plurality of scanning lines line by line in each frame period; wherein, in one scanning period, the scanning directions of the two adjacent frame periods are opposite.
According to the driving method of the display panel provided by the application, the scanning directions of any two adjacent frame periods are opposite.
According to the driving method of the display panel provided by the application, the scanning direction comprises scanning from top to bottom in the column direction or scanning from bottom to top in the column direction.
According to the driving method of the display panel, the first gray scale picture is arranged around the second gray scale picture.
According to the driving method of the display panel provided by the present application, the driving method further includes the steps of:
in each frame period, the plurality of data lines supply different gray scale voltages to the sub-pixels displaying the first gray scale picture and the sub-pixels displaying the second gray scale picture.
According to the driving method of the display panel, in the same frame period, the polarities of the gray scale voltages provided by the two adjacent data lines are opposite.
According to the driving method of the display panel provided by the application, the polarity of the gray scale voltage provided by each data line is inverted from the previous frame period to the next frame period.
According to the driving method of the display panel, in the row direction, every three adjacent sub-pixels form a pixel unit; the three sub-pixels in each pixel unit are respectively a red sub-pixel, a green sub-pixel and a blue sub-pixel.
The application provides a display device, including:
the display panel comprises a plurality of scanning lines extending in the row direction and arranged in parallel and a plurality of data lines extending in the column direction and arranged in parallel; the plurality of scanning lines and the plurality of data lines are insulated and intersected to define a plurality of sub-pixels distributed in an array; the display panel is provided with a first gray scale picture and a second gray scale picture which are arranged adjacently, and the first gray scale picture is at least positioned on one side of the second gray scale picture in the row direction;
a driving module disposed at least one side of the display panel for performing the driving method of any one of claims 1 to 8; the driving module comprises a bidirectional scanning control module and a GOA circuit module;
the bidirectional scanning control module is used for providing a forward scanning direct current control signal and a reverse scanning direct current control signal, and when the forward scanning direct current control signal is at a high level and the reverse scanning direct current control signal is at a low level, the scanning direction of one of two adjacent frame periods is forward scanning; when the forward scanning direct current control signal is at a low level and the reverse scanning direct current control signal is at a high level, the scanning direction of the other frame period in the two adjacent frame periods is reverse scanning;
the GOA circuit module is used for providing gray scale voltage for the data lines and providing scanning signals for the scanning lines line by line.
According to the display device provided by the application, the driving module comprises a source driver and a gate driver; the source electrode driver is electrically connected with the data wires; the gate driver is electrically connected to the plurality of scan lines.
In the driving method and the display device for the display panel, each two adjacent frame time periods are set as one scanning period, and the scanning directions of the two frame time periods in the same scanning period are reversed, for example, the forward scanning is adopted in the first frame time period in the same scanning period, and the reverse scanning is adopted in the second frame time period, so that the brightness of the first gray scale picture and/or the second gray scale picture in the two adjacent frame time periods is complementary, and the brightness balance is realized, so that the vertical crosstalk or the abnormal brightness phenomenon of the first gray scale picture and/or the second gray scale picture disappears, and the display effect of the display panel is favorably improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a display area of an exemplary display panel.
Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a first grayscale image and a second grayscale image of a display panel according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a first grayscale image and a second grayscale image of another display panel according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a first grayscale image and a second grayscale image of another display panel according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a first grayscale frame and a second grayscale frame of another display panel according to an embodiment of the present disclosure.
Fig. 7 is a flowchart illustrating a driving method of a display panel according to an embodiment of the present disclosure.
Fig. 8 is a timing diagram of outputting grayscale voltages through data lines of a first grayscale frame and a second grayscale frame in one frame period according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a portion of sub-pixels and data lines in a first sub-gray scale frame according to an embodiment of the present disclosure.
Fig. 10 is a schematic structural diagram of a GOA unit according to an embodiment of the present disclosure.
Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
Referring to fig. 2 to 9, an embodiment of the present application provides a driving method of a display panel 20.
As shown in fig. 2, the display panel 20 includes a plurality of scan lines (S1-Sm, where m is a positive integer) extending in a row direction (X direction in the drawing) and arranged in parallel, and a plurality of data lines (D1-Dn, where n is a positive integer) extending in a column direction (Y direction in the drawing) and arranged in parallel. The plurality of scanning lines and the plurality of data lines are insulated and intersected to define a plurality of sub-pixels 21 distributed in an array. Specifically, the plurality of sub-pixels 21 are arranged in a plurality of rows and a plurality of columns, each row of sub-pixels 21 is electrically connected with the same scanning line, and each column of sub-pixels 21 is electrically connected with the same data line. It will be appreciated that each sub-pixel 21 is disposed on the same side of the corresponding data line.
Specifically, the scan line periodically provides the scan signal to the corresponding sub-pixel 21, and when the sub-pixel 21 receives the scan signal, the data line electrically connected to the sub-pixel 21 provides the data signal (i.e. the gray scale voltage) to the sub-pixel 21, so as to light the sub-pixel 21. It is understood that the process of periodically providing the scan signal to the corresponding sub-pixel 21 by the scan line is referred to as a scan process.
The display area of the display panel 20 has a first gray scale picture and a second gray scale picture which are adjacently arranged, and the first gray scale picture is at least positioned on one side of the second gray scale picture in the row direction. In one embodiment, as shown in fig. 3, the first gray-scale frame 22 can be disposed around the second gray-scale frame 23; in another embodiment, as shown in fig. 4 and 5, the first grayscale frame 22 can be located above the second grayscale frame 23, or below the second grayscale frame 23; in another embodiment, as shown in fig. 6, the first grayscale images 22 can be located above and below the second grayscale images 23, i.e. located at two sides of the second grayscale images 23 in the row direction.
It should be noted that, when the display panel 20 displays, the first grayscale frame 22 and the second grayscale frame 23 are displayed simultaneously, and the first grayscale frame 22 and the second grayscale frame 23 can display different grayscale frames. In the present embodiment, the first gray-scale frame 22 and the second gray-scale frame 23 shown in fig. 3 are taken as an example for description, and the first gray-scale frame 22 is equivalent to the background frame 11 shown in fig. 1 when displayed, and the second gray-scale frame 23 is equivalent to the window frame 12 shown in fig. 1 when displayed. It can be understood that, a part of the data lines simultaneously penetrate through the first gray scale frame 22 and the second gray scale frame 23 in the column direction, that is, at least one data line is electrically connected to the plurality of sub-pixels 21 disposed in the same column and respectively located in the first gray scale frame 22 and the second gray scale frame 23.
Specifically, as shown in fig. 3, the first gray scale picture 22 can be divided into a first sub gray scale picture 22a, a second sub gray scale picture 22b, a third sub gray scale picture 22c and a fourth sub gray scale picture 22d, wherein the first sub gray scale picture 22a and the second sub gray scale picture 22b are respectively located above and below the second gray scale picture 23, and the third sub gray scale picture 22c and the fourth sub gray scale picture 22d are respectively located at the left and right sides of the second gray scale picture 23. It can be understood that the data line corresponding to the first sub-gray scale frame 22a is disposed corresponding to the second sub-gray scale frame 23 and the second sub-gray scale frame 22b, that is, the data line simultaneously penetrates through the first sub-gray scale frame 22a, the second sub-gray scale frame 22b and the second sub-gray scale frame 23.
As shown in fig. 7, the driving method of the display panel 20 includes step S701.
S701: setting every two adjacent frame periods as a scanning period, and scanning a plurality of scanning lines line by line in each frame period; wherein, in one scanning period, the scanning directions of two adjacent frame periods are opposite.
Specifically, as shown in fig. 2, a plurality of scan lines are disposed parallel to each other in the column direction, and each scan line extends in the row direction. In one frame period, a plurality of scanning lines are scanned line by line in a preset scanning direction, that is, scanning signals are output to the scanning lines line by line to light the sub-pixels 21 line by line.
Specifically, the scanning direction includes scanning from top to bottom in the column direction (may be simply referred to as forward scanning), or scanning from bottom to top in the column direction (may be simply referred to as reverse scanning). In one scanning cycle, the scanning direction of the first frame period is opposite to the scanning direction of the second frame period, for example, in the first frame period, the plurality of scanning lines are scanned line by line from top to bottom in the column direction, and in the second frame period, the plurality of scanning lines are scanned line by line from bottom to top in the column direction.
It is to be understood that, in one scanning cycle, if the first frame period scans the plurality of scanning lines row by row from top to bottom in the column direction, and the second frame period scans the plurality of scanning lines row by row from bottom to top in the column direction, in the first frame period, the sub-pixels in the first sub-gray-scale picture 22a are lit before the sub-pixels in the second gray-scale picture 23, and the sub-pixels in the second gray-scale picture 23 are lit before the sub-pixels in the second sub-gray-scale picture 22b, and in the second frame period, the sub-pixels in the second sub-gray-scale picture 22b are lit before the sub-pixels in the second gray-scale picture 23, and the sub-pixels in the second gray-scale picture 23 are lit before the sub-pixels in the first sub-gray-scale picture 22 a.
In one embodiment, the scanning direction of the first frame period in any two scanning cycles is the same, and it is understood that the scanning direction of the second frame period in any two scanning cycles is also the same. In another embodiment, the scanning period of the first frame period in two adjacent scanning periods is opposite, and it can be understood that the scanning direction of any two adjacent frame periods is opposite.
The driving method further includes step S702:
s702: in each frame period, the plurality of data lines supply different gray scale voltages to the sub-pixels displaying the first gray scale picture and the sub-pixels displaying the second gray scale picture.
Specifically, in one frame period, the plurality of data lines provide the first gray scale voltage to the sub-pixels displaying the first gray scale picture 22 and provide the second gray scale voltage to the sub-pixels displaying the second gray scale picture 23, so that the display panel 20 can simultaneously display two different gray scale pictures.
Specifically, the sub-pixels in the first sub-gray scale picture 22a, the second sub-gray scale picture 22b, the third sub-gray scale picture 22c and the fourth sub-gray scale picture 22d all receive the first gray scale voltage, and the sub-pixels in the second sub-gray scale picture 23 all receive the second gray scale voltage. Since the third sub gray scale picture 22c and the third sub gray scale picture 22c are located at two sides of the second gray scale picture 23, the data lines electrically connected to the sub pixels located in the third sub gray scale picture 22c and the fourth sub gray scale picture 22d only provide the first gray scale voltage in the whole display process. The sub-pixels in the first sub-gray scale picture 22a and the second sub-gray scale picture 22b and the sub-pixels in the second sub-gray scale picture 23 share the data lines passing through the first sub-gray scale picture 22a, the second sub-gray scale picture 23 and the second sub-gray scale picture 22b, so that the data lines passing through the first sub-gray scale picture 22a, the second sub-gray scale picture 23 and the second sub-gray scale picture 22b provide different gray scale voltages in different scanning periods, for example, when the scanning lines scan the sub-pixels in the first sub-gray scale picture 22a and the second sub-gray scale picture 22b, the data lines provide the first gray scale voltage, and when the scanning lines scan the sub-pixels in the second sub-gray scale picture 23, the data lines provide the second gray scale voltage.
Specifically, in the same frame period, the polarities of the gray scale voltages provided by the two adjacent data lines are opposite. And, from the previous frame period to the next frame period, the polarity of the gray scale voltage supplied by each data line is inverted.
In the present embodiment, the gray scale value of the first gray scale frame is 64 and the gray scale value of the second gray scale frame is 255 as an example for description, and in this example, the first gray scale frame is a 64-level gray scale frame and the second gray scale frame is a 255-level yellow scale frame, which is not limited to this.
Since the corresponding relationship between the gray scale voltage and the gray scale value of the gray scale picture is determined by the driving characteristics of the display panel, when the gray scale value of the gray scale picture is known, the gray scale voltage can be searched through a corresponding relationship lookup table of the gray scale voltage and the gray scale value of the gray scale picture, or obtained by interpolation calculation through the corresponding relationship lookup table of the gray scale voltage and the gray scale value of the gray scale picture. For convenience of description, the present embodiment will express the magnitude of the gray scale voltage as a gray scale value with polarity.
Specifically, as shown in fig. 2, in the row direction, every adjacent three sub-pixels 21 constitute one pixel unit 24; the three sub-pixels 21 in each pixel unit 24 are a red sub-pixel, a green sub-pixel, and a blue sub-pixel, respectively. The red sub-pixel is simply referred to as the R or R sub-pixel, the green sub-pixel is simply referred to as the G or G sub-pixel, and the blue sub-pixel is simply referred to as the B or B sub-pixel. It will be appreciated that the color and brightness of each pixel cell 24 is determined by the gray scale values of RGB.
In this embodiment, the first gray scale frame is a 64-level gray scale frame, and the second gray scale frame is a 255-level yellow frame, so that the gray scale values of the RGB sub-pixels in the first gray scale frame 22 are (64, 64, 64), and the gray scale values of the RGB sub-pixels in the second gray scale frame 23 are (255, 255, 0). Correspondingly, when the sub-pixels in the first gray scale frame 22 receive the scan signal (scanned), the corresponding data lines output the first gray scale voltage corresponding to the gray scale values (64, 64, 64) of the RGB sub-pixels, and when the sub-pixels in the second gray scale frame 23 receive the scan signal, the data lines output the second gray scale voltage corresponding to the gray scale values (255, 255, 0) of the RGB sub-pixels. For example, fig. 8 shows a timing chart of output gray-scale voltages of four adjacently disposed data lines Di, Di +1, Di +2, and Di +3 through the first sub gray-scale picture 22a, the second sub gray-scale picture 23, and the second sub gray-scale picture 22b, where i is a positive integer. As shown in fig. 9, the data line Di is electrically connected to one column of R subpixels, the data line Di +1 is electrically connected to one column of G subpixels, the data line Di +2 is electrically connected to one column of B subpixels, and the data line Di +3 is electrically connected to one column of R subpixels. Fig. 9 shows only a part of RGB sub-pixels in the first sub-gray scale screen 22 a.
Specifically, in one frame period (for example, N +1 th frame, N being a positive integer), a plurality of scanning lines are scanned from top to bottom: when the sub-pixels of the first sub-gray scale picture 22a are scanned, the data line Di provides a first gray scale voltage +64 for the R sub-pixel located in the first sub-gray scale picture 22a, the data line Di +1 provides a first gray scale voltage-64 for the G sub-pixel located in the first sub-gray scale picture 22a, the data line Di +2 provides a first gray scale voltage +64 for the B sub-pixel located in the first sub-gray scale picture 22a, and the data line Di +3 provides a first gray scale voltage-64 for the R sub-pixel located in the first sub-gray scale picture 22 a; when the sub-pixels of the second gray scale picture 23 are scanned, the data line Di provides a second gray scale voltage +255 for the R sub-pixels located in the second gray scale picture 23, the data line Di +1 provides a second gray scale voltage-255 for the G sub-pixels located in the second gray scale picture 23, the data line Di +2 provides a second gray scale voltage 0 for the B sub-pixels located in the second gray scale picture 23, and the data line Di +3 provides a second gray scale voltage-255 for the R sub-pixels located in the second gray scale picture 23. It is understood that when the second gray scale frame 23 is scanned, the gray scale voltage of the sub-pixel in the second sub-gray scale frame 22b is still maintained as the gray scale voltage of the previous frame period (for example, the nth frame), and the polarity of the gray scale voltage is opposite to the polarity of the gray scale voltage of the sub-pixel of the first sub-gray scale frame 22a in the current frame period.
Generally, the crosstalk is mainly generated by the parasitic capacitance Cpd between the sub-pixel electrode and the data line, that is, the gray scale voltage actually received by the sub-pixel is deviated from the predetermined gray scale voltage by the coupling effect of the adjacent data line, resulting in abnormal brightness. As shown in fig. 8 and 9, the R sub-pixel in the first sub-gray-scale screen 22a, which is located between the data line Di and the data line Di +1, is subjected to the coupling action (+ coupling of the gray-scale voltage of +64 to the gray-scale voltage direction of + 255) of the data line Di and the coupling action (-coupling of the gray-scale voltage of-64 to the gray-scale voltage direction of-255) of the data line Di +1, and because the polarity of the data line Di and the data line Di +1 is opposite and the gray-scale voltage in the same scanning period is the same, the coupling actions of the data line Di and the data line Di +1 to the R sub-pixel are mutually cancelled, that is, the parasitic capacitance Cpd1 between the data line Di and the R sub-pixel and the parasitic capacitance Cpd2 between the data line Di +1 and the R sub-pixel are mutually cancelled, so that the luminance of the R sub-pixel is not affected (i.e. is not color biased); the G sub-pixels between the data line Di +1 and the data line Di +2 in the first sub-gray scale picture 22a are subjected to the coupling action of the data line Di +1 (-64 gray scale voltage is coupled towards the direction of-255 gray scale voltage) and the coupling action of the data line Di +2 (+64 gray scale voltage is coupled towards the direction of 0 gray scale voltage), so that the G sub-pixels are coupled towards the negative direction comprehensively, and the brightness of the G sub-pixels is slightly bright; and, the B sub-pixel between Di +2 and the data line Di +3 in the first sub-gray scale screen 22a is coupled by the data line Di +2 (+64 gray scale voltage is coupled in the 0 gray scale voltage direction) and the data line Di +3 (-64 gray scale voltage is coupled in the-255 gray scale voltage direction), so that the B sub-pixel is coupled in the negative direction in general, and the brightness of the B sub-pixel is brighter. Therefore, the display brightness of the first sub-gray-scale picture 22a is brighter under the influence of the gray-scale voltage of the second gray-scale picture 23.
Since the gray-scale voltage of the second sub-gray-scale picture 22b is still maintained as the gray-scale voltage of the previous frame period when the second gray-scale picture 23 is scanned, that is, maintained in the state of the polarity opposite to the gray-scale voltage of the first sub-gray-scale picture 22a of the current frame period, the coupling influence on the RGB sub-pixels in the second sub-gray-scale picture 22b is completely opposite to the coupling influence on the RGB sub-pixels in the first sub-gray-scale picture 22a, and it can be understood that the display brightness of the second sub-gray-scale picture 22b is darker under the influence of the gray-scale voltage of the second gray-scale picture 23.
Since the first sub-gray scale picture 22a and the second sub-gray scale picture 22b display the same gray scale picture, and the brightness of the first sub-gray scale picture 22a is different from that of the second sub-gray scale picture 22b, the first gray scale picture 22 has a vertical crosstalk (uneven brightness in the vertical direction), which affects the display effect. In the conventional driving method of the display panel, the scanning directions of the plurality of scanning lines in each frame period are the same, so that the first gray scale picture above and below the second gray scale picture in each frame period has uneven brightness, which seriously affects the display effect. In the present application, two adjacent frame periods are set as one scanning cycle, and the scanning directions of the two frame periods in the same scanning cycle are opposite, it can be understood that, in one scanning cycle, because the scanning direction of the first frame period is opposite to the scanning direction of the second frame period, the coupling effect of the first sub gray scale frame 22a in the first frame period is opposite to that of the second frame period, and the coupling effect of the second sub gray scale frame 22b in the first frame period is opposite to that of the second frame period. For example, in the first frame period, the first sub-gray scale picture 22a is displayed to be bright and the second sub-gray scale picture 22b is displayed to be dark; in the second frame period, the first sub-gray-scale picture 22a is displayed darker and the second sub-gray-scale picture 22b is displayed brighter. Therefore, in one scanning cycle, the luminance of the display screen of the first frame period and the second frame period can be equalized to each other, thereby eliminating vertical crosstalk.
It should be noted that the sub-pixels of the second gray scale frame 23 may also be coupled by the data lines to cause abnormal brightness, and the driving method in the embodiment of the present application can also eliminate the abnormal brightness of the second gray scale frame 23, and the specific principle part can refer to the above analysis of the first gray scale frame 22, which is not described herein again.
In this embodiment, each two adjacent frame periods are set as a scanning cycle, and the scanning directions of the two frame periods in the same scanning cycle are reversed, so that the first sub gray scale frame 22a and the second sub gray scale frame 22b in the first gray scale frame 22 have complementary frame luminances in the two adjacent frame periods, thereby achieving luminance balance, so that the vertical crosstalk of the first gray scale frame 22 disappears, and the display effect of the display panel 20 is improved. Moreover, the scanning directions of two frame periods in the same scanning period are reversed, so that the abnormal brightness phenomenon of the second gray scale picture 23 can be eliminated, and the display effect of the display panel 20 is further improved.
Specifically, as shown in fig. 10, the display panel 20 further includes a plurality of cascaded GOA units for driving each sub-pixel to display, each GOA unit includes a bidirectional scan control module 101 and a GOA circuit module 102 that are electrically connected, the bidirectional scan control module 101 includes a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3) and a fourth thin film transistor (T4), a gate of the first thin film transistor (T1) is electrically connected to the forward scan dc control signal (U2D), a drain of the first thin film transistor (T1) is electrically connected to the first node (Q1), and a source of the first thin film transistor (T1) is electrically connected to the second node (Q2); a gate of the second thin film transistor (T2) is electrically connected to the reverse scan dc control signal (D2U), a drain of the second thin film transistor (T2) is electrically connected to the first node (Q1), a source of the second thin film transistor (T2) is electrically connected to the second node (Q2), and the first node (Q1) is electrically connected to the first active level signal (INF); a gate of the third thin film transistor (T3) is electrically connected to the forward direction scan dc control signal (U2D), a drain of the third thin film transistor (T3) is electrically connected to the second node (Q2), and a source of the third thin film transistor (T3) is electrically connected to the second node (Q2); a gate of the fourth thin film transistor (T4) is electrically connected to the reverse scan dc control signal (D2U), a drain of the fourth thin film transistor (T2) is electrically connected to the third node (Q3), a source of the fourth thin film transistor (T4) is electrically connected to the third node (Q3), the third node (Q3) is electrically connected to the second active level signal (INB), and the second node (Q2) is electrically connected to the GOA circuit module 102. The input terminal of the GOA circuit module 102 is electrically connected to the second node (Q2), and the output terminal of the GOA circuit module 102 is electrically connected to the scan line.
The first thin film transistor (T1) and the third thin film transistor (T3) are N-type thin film transistors, the second thin film transistor (T2) and the fourth thin film transistor (T4) are P-type thin film transistors, the forward scan dc control signal (U2D) and the reverse scan dc control signal (D2U) are dc constant voltage signals, and the levels of the forward scan dc control signal (U2D) and the reverse scan dc control signal (D2U) are opposite. When the forward scan dc control signal (U2D) is at a high level and the reverse scan dc control signal (D2U) is at a low level, the first thin film transistor (T1) and the second thin film transistor (T2) are turned on, the third thin film transistor (T3) and the fourth thin film transistor (T4) are turned off, and the first active level signal (INF) is input to the GOA circuit module 102 to realize that the scan direction of one of the two adjacent frame periods is a forward scan. When the forward scan dc control signal (U2D) is at a low level and the reverse scan dc control signal (D2U) is at a high level, the first thin film transistor (T1) and the second thin film transistor (T2) are turned off, the third thin film transistor (T3) and the fourth thin film transistor (T4) are turned on, and the second active level signal (INF) is input to the GOA circuit module 102 to realize that the scan direction of the other of the two adjacent frame periods is a reverse scan.
As shown in fig. 11, the present embodiment further provides a display device 30, and the display device 30 includes the display panel 20 in the above embodiments and a driving module 31 disposed on at least one side of the display panel 20.
Specifically, the specific structure of the display panel 20 can refer to the above embodiments and fig. 2 to 9, and is not described herein again.
The driving module 31 includes a bidirectional scan control module 101 and a GOA circuit module 102. The bidirectional scanning control module 101 is configured to provide a forward scanning dc control signal and a reverse scanning dc control signal, where when the forward scanning dc control signal is at a high level and the reverse scanning dc control signal is at a low level, a scanning direction of one of two adjacent frame periods is forward scanning, and when the forward scanning dc control signal is at a low level and the reverse scanning dc control signal is at a high level, a scanning direction of the other of the two adjacent frame periods is reverse scanning.
The GOA circuit module 102 is configured to provide gray scale voltages to a plurality of data lines in the display panel 20 and provide scan signals to a plurality of scan lines in the display panel 20 row by row.
Specifically, the driving module 31 includes a source driver 32 and a gate driver 33; the source driver 32 is electrically connected to the plurality of data lines; the gate driver 33 is electrically connected to the plurality of scan lines.
Specifically, the gate driver 33 may control an output sequence of the scan signals, thereby controlling a scan direction of the plurality of scan lines.
In this embodiment, each two adjacent frame periods are set as a scanning cycle, and the scanning directions of the two frame periods in the same scanning cycle are reversed, so that the first sub gray scale frame 22a and the second sub gray scale frame 22b in the first gray scale frame 22 have complementary frame luminances in the two adjacent frame periods, thereby achieving luminance balance, so that the vertical crosstalk of the first gray scale frame 22 disappears, and the display effect of the display device 30 is improved. Moreover, the scanning directions of two frame periods in the same scanning period are reversed, so that the abnormal brightness phenomenon of the second gray scale picture 23 can be eliminated, and the display effect of the display device 30 can be further improved.
The foregoing describes in detail a driving method and a display device of a display panel provided in an embodiment of the present application, and a specific example is applied to illustrate the principle and the implementation of the present application, and the above description of the embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A driving method of a display panel is characterized in that the display panel comprises a plurality of scanning lines extending in a row direction and arranged in parallel and a plurality of data lines extending in a column direction and arranged in parallel; the plurality of scanning lines and the plurality of data lines are insulated and intersected to define a plurality of sub-pixels distributed in an array; the display panel is provided with a first gray scale picture and a second gray scale picture which are arranged adjacently, and the first gray scale picture is at least positioned on one side of the second gray scale picture in the row direction;
the driving method includes the steps of:
setting every two adjacent frame periods as a scanning period, and scanning the plurality of scanning lines line by line in each frame period; wherein, in one scanning period, the scanning directions of the two adjacent frame periods are opposite.
2. The method of driving a display panel according to claim 1, wherein the scanning directions of any adjacent two frame periods are opposite.
3. The method according to claim 1 or 2, wherein the scanning direction comprises scanning from top to bottom in the column direction or from bottom to top in the column direction.
4. The method according to claim 1, wherein the first grayscale picture is disposed around the second grayscale picture.
5. The driving method of the display panel according to claim 1, characterized by further comprising the steps of:
in each frame period, the plurality of data lines supply different gray scale voltages to the sub-pixels displaying the first gray scale picture and the sub-pixels displaying the second gray scale picture.
6. The method according to claim 5, wherein the gray scale voltages provided by two adjacent data lines have opposite polarities in the same frame period.
7. The method of driving a display panel according to claim 6, wherein a polarity of the grayscale voltage supplied to each of the data lines is inverted from a previous frame period to a next frame period.
8. The driving method of the display panel according to claim 1, wherein in the row direction, every adjacent three of the sub-pixels constitute a pixel unit; the three sub-pixels in each pixel unit are respectively a red sub-pixel, a green sub-pixel and a blue sub-pixel.
9. A display device, comprising:
the display panel comprises a plurality of scanning lines extending in the row direction and arranged in parallel and a plurality of data lines extending in the column direction and arranged in parallel; the plurality of scanning lines and the plurality of data lines are insulated and intersected to define a plurality of sub-pixels distributed in an array; the display panel is provided with a first gray scale picture and a second gray scale picture which are arranged adjacently, and the first gray scale picture is at least positioned on one side of the second gray scale picture in the row direction;
a driving module disposed at least one side of the display panel for performing the driving method of any one of claims 1 to 8; the driving module comprises a bidirectional scanning control module and a GOA circuit module;
the bidirectional scanning control module is used for providing a forward scanning direct current control signal and a reverse scanning direct current control signal, and when the forward scanning direct current control signal is at a high level and the reverse scanning direct current control signal is at a low level, the scanning direction of one of two adjacent frame periods is forward scanning; when the forward scanning direct current control signal is at a low level and the reverse scanning direct current control signal is at a high level, the scanning direction of the other frame period in the two adjacent frame periods is reverse scanning;
the GOA circuit module is used for providing gray scale voltage for the data lines and providing scanning signals for the scanning lines line by line.
10. The display device according to claim 9, wherein the driving module includes a source driver and a gate driver; the source electrode driver is electrically connected with the data wires; the gate driver is electrically connected to the plurality of scan lines.
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Application publication date: 20210817 |