CN113611252A - Display panel driving method and display device - Google Patents
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The application discloses a driving method of a display panel and a display device, wherein the driving method comprises the following steps: outputting a scanning signal, a data signal and a common level signal of each pixel to a scanning line, a data line and a common line corresponding to the pixels respectively so as to drive the pixels; the common level signal takes one frame of the display panel as a period, and the level of the common level signal comprises a first common level and a second common level with different level values; corresponding to the current pixel, in the a-th frame, the ending time of the first common level is not later than the opening time of the scanning line corresponding to the current pixel in the a-th frame, and the ending time of the second common level is not earlier than the closing time of the scanning line corresponding to the current pixel in the a-th frame; two pixels in the data line direction are in a group, the 2m-1 th pixel is a main pixel, the 2 m-th pixel is an auxiliary pixel, and the data signals of the main pixel and the auxiliary pixel are the same; a and m are positive integers; the problem of large visual angle color cast is improved by adjusting the driving signal.
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
Most of the existing large-size liquid crystal display panels adopt a negative VA (Vertical Alignment) liquid crystal technology, the VA liquid crystal technology has the advantages of high production efficiency and low manufacturing cost, but the VA liquid crystal technology has a defect of obvious optical properties in optical properties, and particularly the large-size panels need a large viewing angle in commercial application, and the VA liquid crystal driving is rapidly saturated with voltage at a large viewing angle brightness, so that the viewing angle image quality contrast and the color cast are seriously deteriorated compared with the front viewing image quality. In a general VA-mode liquid crystal technology, a viewing angle color cast is solved by subdividing each sub-pixel of RGB (red, green, blue) into main/auxiliary sub-pixels, so that the overall large viewing angle brightness is closer to the front view with the voltage change.
The design of main and auxiliary pixels is that the main pixels are often brighter or darker, the whole display effect is not uniform enough, the visual effect is not good enough, especially, when the polarity of a data signal is reversed, the charging effect of each pixel is affected, and when the frame switching is carried out, the display effect is not good.
Disclosure of Invention
The application aims to provide a driving method and a display device of a display panel, and the display effect of the display panel is improved by converting the voltage value in a common level signal.
To achieve the above object, the present application provides a driving method of a display panel, the driving method including the steps of:
outputting scanning signals, data signals and common level signals corresponding to the scanning lines, the data lines and the common lines of each pixel to the scanning lines, the data lines and the common lines of the pixels respectively so as to drive the pixels;
wherein the common level signal is in a period of one frame of the display panel, the level of the common level signal includes a first common level and a second common level, and a voltage value of the first common level is not equal to a voltage value of the second common level; corresponding to the current pixel, in the a-th frame, the ending time of the first common level is not later than the opening time of the scanning line corresponding to the current pixel in the a-th frame, and the ending time of the second common level is not earlier than the closing time of the scanning line corresponding to the current pixel in the a-th frame; every two pixels in the data line direction form a group, the 2m-1 th pixel is a main pixel, the 2m-1 th pixel is an auxiliary pixel, and the data signals of the main pixel and the auxiliary pixel are the same in the same frame; wherein a is a positive integer.
Optionally, the scanning line corresponding to the current pixel is the nth scanning line, and in the a-th frame, the ending time of the first common level is not earlier than the opening time of the N-1 th scanning line in the a-th frame and not later than the closing time of the N-1 th scanning line in the a-th frame; wherein, N is a positive integer.
Optionally, the scanning line corresponding to the current pixel is the nth scanning line, and in the a-th frame, the ending time of the second common level is not earlier than the opening time of the (N +1) th scanning line in the a-th frame and not later than the closing time of the (N +1) th scanning line in the a-th frame; wherein N is a positive integer.
Optionally, in the a-th frame, the ending time of the second common level is the same time as the middle time of the on time of the (N +1) -th scan line in the a-th frame.
Optionally, a voltage value of the first common level is greater than a voltage value of the second common level.
Optionally, a voltage value of the first common level of the nth scan line is greater than a voltage value of the second common level, and a voltage value of the first common level of the (N +1) th scan line is less than a voltage value of the second common level.
Optionally, the data signals of the pixels of the display panel are dot-inverted with one frame as a period.
Optionally, the data signals of the pixels of the display panel are column-inverted with one frame as a period.
Optionally, the method further includes the step of detecting a viewing angle mode of the display panel:
when the current display mode of the display panel is detected to be a wide view angle mode, the first common level and the second common level are output to the common line corresponding to the current pixel in sequence to drive the display panel;
outputting a constant third common level to the common line for driving the display panel for a frame time when the current display mode of the display panel is detected to be the narrow viewing angle mode.
The application also discloses a display device, which comprises a display panel and a driving module, wherein the driving module drives the display panel; the display panel includes a plurality of data lines, a plurality of scan lines, a plurality of common lines, and a plurality of pixels: each data line provides a data signal; the scanning lines and the data lines are mutually staggered, and each scanning line provides a scanning signal; each of the common lines provides a common level signal; the pixels are respectively driven by the corresponding data lines, scanning lines and common lines; the driving module comprises a common level signal generating module which outputs the corresponding common level signal for each common line; the common level signal takes one frame of the display panel as a period, the level of the common level signal comprises a first common level and a second common level, and the voltage value of the first common level is not equal to the voltage value of the second common level; corresponding to the current pixel, in the a-th frame, the ending time of the first common level is not later than the opening time of the scanning line corresponding to the current pixel in the a-th frame, and the ending time of the second common level is not earlier than the closing time of the scanning line corresponding to the current pixel in the a-th frame; every two pixels in the direction of the data line are in a group, the 2m-1 th pixel is a main pixel, the 2m-1 th pixel is an auxiliary pixel, and the data signals of the main pixel and the auxiliary pixel are the same in the same frame; wherein a is a positive integer.
By periodically adjusting the inversion period of the common level signal in combination with the data drive signal, corresponding to the same pixel, the common level signal of the current pixel is switched to the first common level/the second common level before the scanning signal is charged, after charging, the common level signal and the data driving signal are switched to a second common level/a first common level, brightness adjustment is automatically realized by changing the voltage value of the power supply level signal, high and low voltages are adjacently arranged in space due to the influence of parasitic capacitance, storage capacitance and liquid crystal capacitance, an original brightness signal is maintained by main/auxiliary high and low voltage pixel color mixing in an exemplary scheme, the optical effect that the brightness of a large visual angle is close to a positive visual angle can be achieved, the problem of color deviation of the large visual angle is solved, and the improvement of the color deviation of the visual angle is achieved while the panel characteristic of high penetration rate is maintained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a graph of luminance as a function of voltage for an exemplary technique;
FIG. 2 is a schematic diagram of a driver circuit of the present application;
fig. 3 is a schematic diagram of driving signals corresponding to regions P1 and P2 in fig. 2 according to an exemplary technique;
FIG. 4 is a schematic diagram of a polarity driving scheme corresponding to FIG. 3;
FIG. 5 is a schematic view of a display device of the present application;
FIG. 6 is a schematic diagram of driving signals corresponding to regions P1 and P2 in FIG. 2 according to the present application;
FIG. 7 is a schematic diagram of a polarity driving manner corresponding to the a-th frame and the a + 1-th frame in FIG. 6;
FIG. 8 is a diagram illustrating driving signals corresponding to the regions P1 and P2 in FIG. 2 according to another embodiment of the present application;
FIG. 9 is a schematic diagram of a polarity driving manner corresponding to the a-th frame and the a + 1-th frame in FIG. 8;
fig. 10 is a schematic view of a driving method of the display panel according to the present application.
100, a display device; 110. a display panel; 111. a pixel; 112. a visual angle switching module; 113. scanning a line; 114. a data line; 115. a common line; 120. a drive module; 121. and a common level signal generation module.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present application. This application may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, it is to be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means two or more unless otherwise specified. Additionally, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be specifically understood by those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The present application is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the VA mode liquid crystal driving causes the contrast and color shift of the viewing angle image to be worse than the front view image quality (the brightness is shown as the curve B in the left coordinate axis of fig. 1) due to the rapid saturation of the brightness with the voltage at the large viewing angle (as shown as the curve E in the left coordinate axis of fig. 1). The applicant discloses a method for solving the color cast of a viewing angle, which is to divide each sub-pixel of RGB (red, green and blue) into main/auxiliary pixels, so that the whole large viewing angle brightness is closer to the front view along with the voltage change (the curve of the large viewing angle brightness along with the voltage in a right coordinate axis is closer to the straight line of the brightness along with the voltage in the right coordinate axis), and the defect of the color cast of the viewing angle is solved by giving different driving voltages to the main and auxiliary pixels in space.
Specifically, the relationship of brightness changing with voltage can be seen through the right coordinate axis in the attached figure 1, in the figure, a large voltage plus a small voltage signal is shown, the front large voltage plus the small voltage needs to maintain the original front signal changing with brightness, the side-looking brightness seen by the large voltage changes with gray scale like a curve C, the side-looking brightness seen by the small voltage changes with gray scale like a curve D, so that the brightness seen by the side-looking synthesis changes with gray scale like a curve E, and is closer to the relationship of the front brightness changing with gray scale of a curve B, so that the relationship of the visual angle brightness changing with signal is close to the relationship of the front original signal brightness changing with signal, and the visual angle is improved.
As shown in fig. 2 to 4, the applicant discloses a driving method of a liquid crystal display, fig. 2 is a driving circuit of the display, the driving circuit includes a scanning signal Gn of an nth row scanning line, a common level signal Vstn of an nth row common line, and a data signal Datam of an mth data line; fig. 3 shows the operation principle of the driving signals, in which the scanning signals Gn and Gn +1 sequentially turn on the pixels for charging, the Data signal Datam corresponds to the sub-pixel 111 in the mth column, the scanning signal Gn corresponds to the sub-pixel 111 in the nth row, the Data signal Data (m, n) for charging the sub-pixel 111 in the nth column and the nth row when the scanning signal Gn is turned on follows the Data signal Data (m, n +1) for charging the sub-pixel 111 in the nth column and the nth +1 row when the scanning signal Gn +1 is turned on.
The common level signal voltage of a general display is a dc constant signal, i.e., the nth row common level signal Vstn is equal to the (n +1) th row common level signal Vstn + 1. Fig. 5 shows a dot inversion polarity driving method for data signals, where the polarities of adjacent sub-pixels are opposite, the positive polarity represents that the data signals are larger than the common level signals, and the negative polarity represents that the data signals are smaller than the common level signals.
Specifically, referring to the Data signal Data (m, n) charged by the nth row subpixel 111 in the mth column in fig. 4, the subpixel 111 charging signal Vp (m, n) is greater than the common level signal Vst (m, n) by driving with positive polarity at the time of the a-th frame; when the (a +1) th frame is displayed, the charged Data signal Data (m, n) of the m-th column and n-th row sub-pixel 111 is driven with negative polarity, and the charged signal Vp (m, n) of the sub-pixel 111 is smaller than the common level signal Vst (m, n).
In contrast, the sub-pixel 111 in the (m) th column and (n +1) th row is charged by the negative polarity driving at the time of the a frame, the charged signal Vp (m, n +1) of the sub-pixel 111 is smaller than the common level signal Vst (m, n +1), the Data signal Data (m, n +1) charged by the sub-pixel 111 is driven by the positive polarity at the time of the a +1 frame, and the charged signal Vp (m, n +1) of the sub-pixel 111 is larger than the common level signal Vst (m, n + 1).
As shown in fig. 5, an embodiment of the present application discloses a display device 100, the display device 100 includes a display panel 110 and a driving module 120, the display panel 110 is configured to display a screen, and the driving module 120 is configured to drive the display panel 110; the display panel 110 includes a scan line 113, a data line 114, and a common line 115 for respectively receiving a scan signal, a data signal, and a common level signal to the current pixel 111 of the display panel 110; a plurality of data lines 114 provide a data signal; a plurality of scan lines 113 interleaved with the plurality of data lines 114 for providing a scan signal; a plurality of common lines 115 providing a common level signal; the plurality of pixels 111 are driven by corresponding data lines 114, scan lines 113, and common lines 115, respectively.
The driving module 120 includes a common level signal generating module 121 outputting a common level signal to common lines of the display panel 110, as shown in fig. 6, where the common level signal is provided in a period of one frame of the display panel, a level of the common level signal includes a first common level and a second common level, a voltage value Vcom1 of the first common level is not equal to a voltage value Vcom2 of the second common level, and the voltage value of the first common level is greater than the voltage value of the second common level;
corresponding to the current pixel, in the a-th frame, the ending time of the first common level is not later than the opening time of the scanning line corresponding to the current pixel in the a-th frame, and the ending time of the second common level is not earlier than the closing time of the scanning line corresponding to the current pixel in the a-th frame; every two pixels in the data line direction form a group, the 2m-1 th pixel is a main pixel, the 2m-1 th pixel is an auxiliary pixel, and the data signals of the main pixel and the auxiliary pixel are the same in the same frame; wherein a and m are positive integers.
Correspondingly, the driving module 120 of the display device 100 further includes a viewing angle switching module 112 connected to the common level signal generating module 121; when the display panel 110 is driven at a wide viewing angle, the viewing angle switching module 112 controls the common level signal generating module 121 to output a common level signal; when the display panel 110 is driven at a narrow viewing angle, the viewing angle switching module 112 controls the common level signal generating module 121 to output a constant third common level. Switching the viewing angle of the display panel 110 as required, and outputting an alternating voltage to the common line 115 to drive the display panel 110 to display in a wide viewing angle mode; in the narrow viewing angle mode, a constant voltage is output to the common line 115 to drive the display panel 110 to display, the main pixel and the auxiliary pixel can be two independent pixels, different gray scales can be independently displayed, any improvement on the structure is not needed, only the common level signal output by the common line needs to be adjusted, the resolution can be doubled, and the display effect of the display panel 110 under various conditions is better. Wherein the first common level is equal to the third common level.
If the current scanning line corresponding to the pixel is the Nth scanning line, in the a-th frame, the ending time of the first common level is not earlier than the opening time of the (N-1) th scanning line in the a-th frame and not later than the closing time of the (N-1) th scanning line in the a-th frame; wherein N is a positive integer.
As another embodiment of the present application, the scanning line corresponding to the current pixel is the nth scanning line, and in the a-th frame, the ending time of the second common level is not earlier than the opening time of the (N +1) th scanning line in the a-th frame and not later than the closing time of the (N +1) th scanning line in the a-th frame; wherein N is a positive integer; in the a-th frame, the ending time of the second common level is the same time as the middle time of the opening time of the (N +1) -th scanning line in the a-th frame.
Of course, the second common level may be not later than the opening time of the scanning line corresponding to the current pixel in the a +1 th frame at the ending time of the a th frame; furthermore, in the N +1 th scan line corresponding to the current pixel, the voltage value of the first common level corresponding to the N +1 th scan line may be greater than or less than the voltage value of the second common level.
Thus, the adjacent arrangement of high and low voltages in space is realized by adjusting the driving signals, the main/auxiliary high and low voltage pixel color mixing in the exemplary scheme is formed to maintain the original brightness signal, the optical effect that the brightness of a large visual angle is close to the positive visual angle can be achieved, the problem of color deviation of the large visual angle is improved, the improvement of the color deviation of the visual angle is further achieved under the condition of maintaining the panel characteristic of higher penetration rate, and compared with the exemplary scheme, the scheme only adjusts the driving signals without great change, and has lower cost; specifically, the scheme limits the starting time of the first common level and the second common level, and can realize quick improvement of the problem of visual angle color cast.
Specifically, in the a-th frame, the polarity of the data signal of the data line corresponding to the current pixel is a first polarity, and in the a + 1-th frame, the polarity of the data signal of the data line corresponding to the current pixel 111 is a second polarity, where the first polarity is opposite to the second polarity.
More specifically, assuming that the scan line corresponding to the current pixel is the nth scan line and the corresponding data line 114 is the mth column data line 114, when in the a-th frame, the polarities of the data signals of the data lines corresponding to the current pixel, i.e., the (N, M) and (N +1, M +1) th pixels 111 are the first polarity, and the polarities of the data signals of the data lines 114 corresponding to the (N +1, M) th and (N, M +1) th pixels are the second polarity, the first polarity is opposite to the second polarity; in the a +1 th frame, the polarities of the data signals of the data lines corresponding to the current pixel, i.e., the (N, M) th and (N +1, M +1) th pixels are the second polarity, and the polarities of the data signals of the data lines 114 corresponding to the (N +1, M) th and (N, M +1) th pixels are the first polarity, which is opposite to the second polarity.
The method for realizing the adjacent high-low voltage sub-pixels is to change the common level signal to realize the high-low voltage under the same driving mode of the scanning signal Gn and the data signal Datam as the figure 3, thereby improving the defect of large visual angle color cast. As shown in fig. 7, the Data signal Data (m, n) charged by the nth row subpixel 111 in the mth column is driven with positive polarity at the time of the a-th frame, i.e., the subpixel 111 charging signal Vp (m, n) is greater than the common level signal Vst (m, n).
When the scanning signal of the nth row sub-pixel 111 starts to be charged, the common level signal Vst (m, n) is first switched from a high voltage to a low voltage, the scanning signal is turned off after the charging is completed, the common level signal Vst (m, n) is switched from a relatively low voltage to a high voltage at the time, the charge is conserved because the pixel 111 has a parasitic capacitance, a storage capacitance, and a liquid crystal capacitance, and when the common level signal Vst (m, n) changes, the charging signal Vp (m, n) of the mth row sub-pixel 111 is boosted by Δ V because the common level signal Vst (m, n) is switched from a relatively low voltage to a high voltage, that is, the voltage difference between Vp (m, n) and the common level signal Vst (m, n) is changed from x to x + Δ V, and the increase of the positive voltage increases the luminance of the sub-pixel 111.
In contrast, the charged sub-pixels 111 in the (m) th row and the (n +1) th row are driven with negative polarity during the (a) th frame, the charged signal Vp (m, n +1) of the sub-pixel 111 is smaller than the common level signal Vst (m, n +1), when the scan signal of the (n +1) th row of sub-pixels 111 starts to be charged, the common level signal Vst (m, n) is first switched from high voltage to low voltage, after the charging is completed, the scan signal is turned off, and the common level signal Vst (m, n +1) is switched from relatively low voltage to high voltage, at this time, because the pixel 111 has parasitic capacitance, storage capacitance, and liquid crystal capacitance, the charge is conserved, when the common level signal Vst (m, n) changes, the charged signal Vp (m, n +1) of the (n +1) th row of sub-pixels 111 in the (m) th row and the n +1) th row of the m is switched from relatively low voltage to high voltage and is boosted by Δ V, that is, the voltage difference between Vp (m, n +1) and the common level signal Vst (m, n +1) changes from-x to-x + Δ V, and the negative voltage increases by Δ V to decrease the brightness of the sub-pixel 111.
As shown in fig. 8, when the a frame is switched to the a +1 frame, in contrast, the Data signal Data (m, n) charged by the nth row subpixel 111 in the mth column is driven with negative polarity, the charge signal Vp (m, n) of the subpixel 111 in the nth row is smaller than the common level signal Vst (m, n), when the scan signal of the nth row subpixel 111 starts to be charged, the common level signal Vst (m, n) is first switched from high voltage to low voltage, the charge is completed, the scan signal is turned off, the common level signal Vst (m, n) is switched from relatively low voltage to high voltage, the charge is conserved due to the parasitic capacitance, the storage capacitance, and the liquid crystal capacitance of the pixel 111, and when the common level signal Vst (m, n) changes, the charge signal Vp (m, n) of the nth row subpixel 111 in the mth column is switched from relatively low voltage to high voltage, the voltage is increased by the voltage Δ V, that is, the voltage difference between the charge signal Vp (m, n) of the sub-pixel 111 in the mth column and the nth row and the common level signal Vst (m, n) is changed from-x to-x + Δ V, and the increase of the negative voltage Δ V decreases the brightness of the sub-pixel 111.
Similarly, the charged Data signal Data (m, n +1) of the mth column and row n +1 sub-pixel 111 is driven by positive polarity Vp (m, n +1) to be greater than the common level signal Vst (m, n +1) during the a +1 frame, when the scan signal of the row n +1 sub-pixel 111 starts to be charged, the common level signal Vst (m, n) is first switched from high voltage to low voltage, the charge is completed, the scan signal is turned off, the common level signal Vst (m, n +1) is switched from relatively low voltage to high voltage, the charge is conserved due to parasitic capacitance, storage capacitance and liquid crystal capacitance of the pixel 111, and when the common level signal Vst (m, n) changes, the charged signal Vp (m, n +1) of the mth column and row n +1 sub-pixel 111 increases by Δ V due to the common level signal Vst (m, n +1) being switched from relatively low voltage to high voltage, that is, the voltage difference between the charge signal Vp (m, n +1) and the common level signal Vst (m, n +1) of the sub-pixel 111 in the (m) th column and the (n +1) th row changes from x to x + Δ V, and the increase of the positive voltage increases the brightness of the sub-pixel 111. Wherein a, M, N, N and M are positive integers; x is the voltage value of the charging signal of the sub-pixel 111 after the scanning signal is turned off.
The common level signal is periodically switched, so that in the a-th frame, two adjacent sub-pixels are provided, the nth scanning line of the first sub-pixel corresponds to a brighter main pixel, the (N +1) th scanning line corresponds to a darker auxiliary pixel, the nth scanning line of the second sub-pixel corresponds to a darker auxiliary pixel, and the (N +1) th scanning line corresponds to a brighter main pixel. The setting makes the bright and dark even interval of pixel like this, and when next frame, bright and dark reversal, originally bright dim, originally dark turn bright earlier, so bright and dark change makes display panel luminance more even when a frame switches, and display effect is better.
In another embodiment of the present application, different from the previous embodiment, the scanning line 113 corresponding to the current pixel is assumed to be an nth scanning line 113, and the corresponding data line 114 is an mth column data line 114, when in the a-th frame, the first common level is switched to the second common level at the start time of one frame, and the second common level is switched to the first common level at the end time of one frame, a voltage value of the first common level of the nth scanning line is greater than a voltage value of the second common level; the polarities of the data signals of the data lines 114 corresponding to the current pixel 111, i.e., (N, M) and (N +1, M) th pixels 111 are a first polarity, and the polarities of the data signals of the data lines 114 corresponding to the (N +1, M +1) th and (N, M +1) th pixels 111 are a second polarity, the first polarity being opposite to the second polarity; in the a +1 th frame, the polarity of the data signal of the data line 114 corresponding to the current pixel 111, i.e., (N, M) and (N +1, M) th pixel 111 is the second polarity 132, and the polarity of the data signal of the data line 114 corresponding to the (N +1, M +1) th and (N, M +1) th pixels 111 is the first polarity 133, which is opposite to the second polarity.
As shown in fig. 8 to 9, the Data signal Data (m, n) charged by the nth row sub-pixel 111 in the mth column is driven with positive polarity as in the previous embodiment, i.e. the charging signal Vp (m, n) of the sub-pixel 111 is greater than the common level signal Vst (m, n) at the time of the mth frame.
When the m-th row and n + 1-th row of sub-pixels 111 are charged in the a-th frame, the positive driving is used, i.e. the charging signal Vp (m, n +1) of the sub-pixel 111 is greater than the common level signal Vst (m, n +1), when the scanning signal of the n + 1-th row of sub-pixels 111 starts to be charged, the common level signal Vst (m, n +1) is switched from the low voltage to the high voltage, the charging is completed, the scanning signal is turned off, the common level signal Vst (m, n +1) is switched from the relatively high voltage to the low voltage, the charging signal Vp (m, n +1) of the m-th row and n + 1-th row of sub-pixels 111 is boosted by Δ V due to the parasitic capacitance of the pixel 111, i.e. Vp (m, n +1) and the common level signal Vst (m, n +1) is changed from x to x + Δ V, and the positive polarity voltage is increased by Δ V to increase the luminance of the sub-pixel 111.
The charged Data signal Data (m, n) of the nth row sub-pixel 111 in the mth column is driven with negative polarity at the time of the a +1 th frame, that is, the charging signal Vp (m, n) of the sub-pixel 111 is smaller than the common level signal Vst (m, n), as in the previous embodiment.
The Data signal Data (m, n +1) charged in the mth column and row (n +1) sub-pixel 111 is driven with negative polarity Vp (m, n +1) less than the common level signal Vst (m, n +1) during the a +1 frame, when the scan signal of the row (n +1) sub-pixel 111 starts to be charged, the common level signal Vst (m, n) is first switched from low voltage to high voltage, the charging is completed, the scan signal is turned off, the common level signal Vst (m, n +1) is switched from relatively high voltage to low voltage, at this time, due to the parasitic capacitance of the pixel 111, the charging signal Vp (m, n +1) of the row (n +1) sub-pixel 111 in the mth column is reduced in voltage by Δ V because the common level signal Vst (m, n +1) is switched from relatively high voltage to low voltage, the charging signal Vp (m, n +1) and the common level signal Vst (m, n +1), the voltage difference between-x and- Δ V is changed, and the decrease of the negative polarity voltage increases the luminance of the sub-pixel 111. Wherein a, M, N, N and M are positive integers; x is the voltage value of the charging signal of the sub-pixel 111 after the scanning signal is turned off.
The common level signal is periodically switched, so that in the a-th frame, two adjacent sub-pixels are provided, the nth scanning line of the first sub-pixel corresponds to a brighter main pixel, the (N +1) th scanning line corresponds to a darker auxiliary pixel, the nth scanning line of the second sub-pixel corresponds to a darker auxiliary pixel, and the (N +1) th scanning line corresponds to a brighter main pixel. The setting makes the even interval of bright dark of pixel 111, and when next frame, bright dark reversal, originally bright dark, originally dark becomes bright, and so bright dark change makes display panel luminance more even when a frame switches, and the display effect is better.
As shown in fig. 10, an embodiment of the present application discloses a driving method of a display panel, which further includes, in use of the display panel, a step of detecting a viewing angle mode of the display panel:
s1, judging the current view angle mode of the display panel;
s2, when the current display mode of the display panel is detected to be a wide view angle mode, outputting the first common level and the second common level to the common line corresponding to the current pixel in sequence to drive the display panel;
s3, outputting a constant third common level to the common line for driving the display panel during a frame time when the current display mode of the display panel is detected to be the narrow viewing angle mode.
Correspondingly, the driving module of the display device also comprises a visual angle switching module which is connected with the common level signal generating module; when the display panel is driven at a wide viewing angle, the viewing angle switching module controls the common level signal generating module to output a common level signal; when the display panel is driven at a narrow viewing angle, the viewing angle switching module controls the common level signal generating module to output a constant level. Switching the visual angle of the display panel according to the requirement, and outputting alternating voltage to a public line to drive the display panel to display in a wide visual angle mode; in a narrow viewing angle mode, a constant voltage is output to the common line to drive the display panel to display, so that the display effect of the display panel under various conditions is better.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all should be considered to belong to the protection scope of the present application.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A driving method of a display panel, the driving method comprising the steps of:
outputting scanning signals, data signals and common level signals corresponding to the scanning lines, the data lines and the common lines of each pixel to the scanning lines, the data lines and the common lines of the pixels respectively so as to drive the pixels;
wherein the common level signal is in a period of one frame of the display panel, the level of the common level signal includes a first common level and a second common level, and a voltage value of the first common level is not equal to a voltage value of the second common level;
corresponding to the current pixel, in the a-th frame, the ending time of the first common level is not later than the opening time of the scanning line corresponding to the current pixel in the a-th frame, and the ending time of the second common level is not earlier than the closing time of the scanning line corresponding to the current pixel in the a-th frame;
every two pixels in the direction of the data line are in a group, the 2m-1 th pixel is a main pixel, the 2m-1 th pixel is an auxiliary pixel, and the data signals of the main pixel and the auxiliary pixel are the same in the same frame;
wherein a and m are positive integers.
2. The method according to claim 1, wherein the scanning line corresponding to the current pixel is an nth scanning line, and in the a-th frame, the ending time of the first common level is not earlier than the turning-on time of the N-1 th scanning line in the a-th frame and not later than the turning-off time of the N-1 th scanning line in the a-th frame;
wherein N is a positive integer.
3. The method according to claim 1, wherein the scanning line corresponding to the current pixel is an nth scanning line, and in the a-th frame, the ending time of the second common level is not earlier than the turning-on time of the (N +1) th scanning line in the a-th frame and not later than the turning-off time of the (N +1) th scanning line in the a-th frame;
wherein N is a positive integer.
4. The method according to claim 3, wherein in the a-th frame, the end time of the second common level is the same time as the middle time of the on time of the (N +1) -th scan line in the a-th frame.
5. The method of claim 1, wherein a voltage value of the first common level is greater than a voltage value of the second common level.
6. The method of claim 1, wherein a voltage value of the first common level of the nth scan line is greater than a voltage value of the second common level, and a voltage value of the first common level of the N +1 th scan line is less than a voltage value of the second common level.
7. The method for driving a display panel according to claim 1 or 5, wherein the data signals of the pixels of the display panel are dot-inverted at a period of one frame.
8. The method for driving a display panel according to claim 1 or 6, wherein the data signals of the pixels of the display panel are column-inverted in a period of one frame.
9. The method of driving a display panel according to claim 1, further comprising the step of detecting a viewing angle mode of the display panel:
when the current display mode of the display panel is detected to be a wide view angle mode, the first common level and the second common level are sequentially output to a common line corresponding to the current pixel to drive the display panel;
outputting a constant third common level to the common line for driving the display panel for a frame time when the current display mode of the display panel is detected to be the narrow viewing angle mode.
10. A display device, comprising:
a display panel;
a driving module driving the display panel;
wherein the display panel includes:
a plurality of data lines, each of the data lines providing a data signal;
a plurality of scan lines, wherein the scan lines and the data lines are interlaced with each other, and each scan line provides a scan signal;
a plurality of common lines, each of the common lines providing a common level signal; and
a plurality of pixels respectively driven by the corresponding data lines, scan lines, and common lines;
the driving module comprises a common level signal generating module which outputs a corresponding common level signal for each common line;
the common level signal takes one frame of the display panel as a period, the level of the common level signal comprises a first common level and a second common level, and the voltage value of the first common level is not equal to the voltage value of the second common level;
corresponding to the current pixel, in the a-th frame, the ending time of the first common level is not later than the opening time of the scanning line corresponding to the current pixel in the a-th frame, and the ending time of the second common level is not earlier than the closing time of the scanning line corresponding to the current pixel in the a-th frame;
every two pixels in the direction of the data line are in a group, the 2m-1 th pixel is a main pixel, the 2m-1 th pixel is an auxiliary pixel, and the data signals of the main pixel and the auxiliary pixel are the same in the same frame;
wherein a is a positive integer.
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Application publication date: 20211105 |