CN113380206A

CN113380206A - Display panel driving method and display device

Info

Publication number: CN113380206A
Application number: CN202110600309.4A
Authority: CN
Inventors: 康志聪; 袁海江
Original assignee: HKC Co Ltd; Beihai HKC Optoelectronics Technology Co Ltd
Current assignee: HKC Co Ltd; Beihai HKC Optoelectronics Technology Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-09-10

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 two frames 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; at the frame a of the current pixel, the switching time between the first common level and the second common level is not earlier than the opening time of the scanning line corresponding to the current pixel at the frame a and not later than the opening time of the scanning line corresponding to the current pixel at the frame a + 1; two pixels are arranged in a group along the direction of a data line, the 2m-1 th pixel is a main pixel, the 2m 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

Display panel driving method and display device

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

The current large-size liquid crystal display panel, especially the large-size panel, needs a larger viewing angle for displaying in commercial application, and the liquid crystal driving is rapidly saturated with voltage at the large viewing angle brightness, which causes the quality deterioration of the viewing angle image quality contrast and the color cast compared with the front view image quality.

In an exemplary technology, a liquid crystal technology solves the color cast of a viewing angle by subdividing RGB (red, green, and blue) pixels into main/auxiliary pixels with different brightness, so that the overall large viewing angle brightness is closer to the front view along with the voltage change. How to improve the color cast phenomenon of large viewing angle is an important research direction in the field.

Disclosure of Invention

The present application provides a driving method and a display device for a display panel, so that the overall brightness of a large viewing angle is closer to the front view along with the voltage change, and the color cast phenomenon of the large viewing angle is improved.

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 two frames of the display panel, the level of the common level signal includes 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, at the time of the a-th frame, the switching time between the first common level and the second common level is not earlier than the opening time of the scanning line corresponding to the current pixel at the time of the a-th frame and not later than the opening time of the scanning line corresponding to the current pixel at the a + 1-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.

Optionally, when the scan lines corresponding to the main pixel and the auxiliary pixel respectively are at adjacent turn-on times, the corresponding data lines output data voltages with opposite polarities.

Optionally, the data signals corresponding to the main pixel and the auxiliary pixel are both dot inversion; the voltage value of the first common level is smaller than that of the second common level, and in the same frame, common level signals corresponding to the main pixel and the auxiliary pixel are switched from the first common level to the second common level or from the second common level to the first common level.

Optionally, the data signals corresponding to the main pixel and the auxiliary pixel are both column inversion; in the same frame, common level signals corresponding to the main pixel and the auxiliary pixel are switched from the first common level to a second common level or are switched from the second common level to the first common level; the voltage value of the first common level of the main pixel is smaller than that of the second common level, and the voltage value of the first common level of the auxiliary pixel is larger than that of the second common level.

Optionally, the polarities of the data signals in the 4m +1 th frame and the 4m +2 th frame are the same and are opposite to the polarities in the 4m +3 th frame and the 4m +4 th frame, corresponding to the same main/auxiliary pixel; wherein m is a natural number.

Optionally, the data signals corresponding to the main pixel and the auxiliary pixel are both dot inversion; in the same frame, the polarities of the main pixel and the auxiliary pixel corresponding to the same pixel of the data signal are opposite, and the polarities of the main pixel and the adjacent main pixel corresponding to the data signal are opposite; the voltage value of the first common level is smaller than that of the second common level, and in the same frame, common level signals corresponding to the main pixel and the auxiliary pixel are switched from the first common level to the second common level or from the second common level to the first common level.

Optionally, the data signals corresponding to the main pixel and the auxiliary pixel are column-inverted; in the same frame, the polarities of the main pixel and the auxiliary pixel of the data signal corresponding to the same pixel are the same; in the same frame, common level signals corresponding to the main pixel and the auxiliary pixel are switched from the first common level to a second common level or are switched from the second common level to the first common level; the voltage value of the first common level of the main pixel is smaller than that of the second common level, and the voltage value of the first common level of the auxiliary pixel is larger than that of the second common level.

Optionally, the first common level or the second common level of the common line corresponding to the main pixel is the same time at the starting time of the a-th frame as the middle time of the opening time of the next scanning line of the scanning line corresponding to the main pixel in the a-th frame;

the first common level or the second common level of the common line corresponding to the auxiliary pixel is the same time at the starting time of the a-th frame as the middle time of the opening time of the next scanning line of the scanning line corresponding to the auxiliary pixel in the a-th frame.

Optionally, the driving 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, outputting the first common level and the second common level to the common line in sequence to drive the display panel; and

outputting a constant third common level to the common line to drive the display panel in one period of the common level signal when it is detected that a current display mode of the display panel is a narrow viewing angle mode.

The application also provides a display device, which comprises a display panel and a driving module for driving the display panel; the display panel comprises a plurality of data lines, a plurality of scanning lines, a plurality of independent 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 plurality of pixels are respectively driven by the corresponding data lines, the scanning lines and the 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 two frames 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, at the a-th frame, the switching time between the first common level and the second common level is not earlier than the opening time of the scanning line corresponding to the current pixel at the a-th frame and not later than the opening time of the scanning line corresponding to the current pixel at the a + 1-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.

This application need not change display panel's pixel design, and through the adjustment to drive signal, two pixels that will adjacent physical structure identical, as main pixel and the supplementary pixel of the difference of brightness of same pixel respectively, form a pixel jointly, through main pixel and supplementary pixel independent control, make can make the luminance that can change corresponding main/supplementary pixel through the height switch of the public level of control communal line, need not handle data signal, even when the data signal of main pixel and supplementary pixel is the same for same grey scale, through the difference of public level signal, also can realize the difference of brightness of main pixel and supplementary pixel automatically, reach the effect of improving colour cast.

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 schematic diagram of a driver circuit of the present application;

FIG. 2 is a schematic diagram of a dot inversion driving corresponding to the driving circuit of FIG. 1 according to an exemplary technique;

FIG. 3 is a schematic diagram of an exemplary technique for column inversion driving of the drive circuit of FIG. 1;

FIG. 4 is a schematic diagram of a polarity drive corresponding to FIG. 2;

FIG. 5 is a schematic diagram of the polarity drive corresponding to FIG. 3;

FIG. 6 is a schematic diagram of a dot inversion driving of one of the driving circuits in FIG. 1 according to the present application;

FIG. 7 is a schematic diagram of dot inversion driving of another driving circuit corresponding to FIG. 1;

FIG. 8 is a schematic diagram of the polarity drive of FIGS. 6 and 7, respectively, according to the present application;

FIG. 9 is a schematic diagram of column inversion driving of one of the driving circuits in FIG. 1 according to the present application;

FIG. 10 is a schematic diagram of column inversion driving of another driving circuit of FIG. 1 according to the present application;

FIG. 11 is a schematic diagram of the polarity drive of FIGS. 9 and 10, respectively, according to the present application;

FIG. 12 is a schematic diagram illustrating a step of switching the viewing angle of the display panel according to the present application;

fig. 13 is a schematic diagram of the dot-inverted narrow viewing angle polarity driving of the present application;

FIG. 14 is a schematic diagram of the present application of column-reversed narrow viewing angle polarity driving;

fig. 15 is a schematic view of a display device of 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. a common level signal generating module; 130. a main pixel; 131. a sub-pixel; 132. a first time period; 133. a second time period; 134. a first common level; 135. a second common level; 136. a third common level.

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, "a plurality" means two or more unless otherwise specified. Furthermore, 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 either 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 understood in a specific case 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 to 5, in order to drive the lcd panel in an exemplary technique, fig. 1 is a driving circuit structure of the display, wherein the driving circuit includes a scan signal Gn, a common level signal Vstn, and a data signal Datam; fig. 2 and fig. 3 show the operation principle of the driving signals, the scanning signals Gn and Gn +1 sequentially turn on the tfts corresponding to the pixels to charge the pixels 111 according to the high voltage signal, and the data signal Datam corresponds to the pixels 111 in the mth row; the scanning signal Gn corresponds to the pixel 111 in the nth row, when the scanning signal Gn is turned on, the Data signal for charging the main pixel 130 in the nth row in the mth column is Data (m, n), and when the scanning signal Gn +1 is turned on, the Data signal for charging the auxiliary pixel 131 in the (n +1) th row in the mth column is Data (m, n + 1). The voltage of the common level signal in the driving manner of the liquid crystal display of the exemplary technology is a dc constant signal, that is, the voltages of the nth row common level signal Vstn and the n +1 th row common level Vstn +1 are both dc constant common level 136.

Specifically, fig. 2 shows that the data signals of the exemplary technique adopt a dot inversion polarity driving method, the polarities of the adjacent pixels 111 are opposite, the positive polarity represents that the data signals are greater than the common level signals, and the negative polarity represents that the data signals are less than the common level signals; fig. 3 shows a polarity driving manner in which the data signals of the exemplary technique are driven by column inversion, the polarities of the pixels 111 in the same column are the same, the polarities of the pixels 111 in adjacent columns 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.

FIG. 4 shows a polarity driving method corresponding to the dot inversion of FIG. 2, and FIG. 5 shows a polarity driving method corresponding to the column inversion of FIG. 3; in fig. 4 and 5, "+" indicates a positive polarity and "-" indicates a negative polarity.

Two of the pixels are grouped along the data line direction, the 2m-1 th pixel is a main pixel, the 2m-1 th pixel is an auxiliary pixel, when the same frame is used, the data signals of the main pixel and the auxiliary pixel are the same, each of the main pixel 130 and the auxiliary pixel 131 is an actual pixel which can be actually and independently controlled, and for the main pixel 130 and the auxiliary pixel 131 of the same pixel 111, if the brightness is different to improve the color cast, the data signals of different gray scales must be applied, but such design needs to respectively generate the data signals of the actually driven main pixel 130 and the actually driven auxiliary pixel 131 according to the source data which is consistent with the target brightness of the whole pixel 111, so the calculation amount is large, and the driving is complex. However, if the data signals of the same gray scale are applied, the main pixel 130 and the sub pixel 131 having different brightness cannot be realized, and the color shift phenomenon cannot be improved.

As shown in fig. 6 to 11, an embodiment of the present application discloses a display panel 110 and a corresponding driving method, where the driving method includes the steps of:

and S1, outputting the scanning signals, the data signals and the 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 to drive the pixels.

The two pixels are grouped along the data line direction, the 2m-1 th pixel is a main pixel, the 2 m-th pixel is an auxiliary pixel, the data signals of the main pixel and the auxiliary pixel are the same in the same frame, each of the main pixel 130 and the auxiliary pixel 131 is an actual pixel which can be actually independently controlled, namely, each of the main pixel 130 and the auxiliary pixel 131 is driven by the corresponding data line 114, the corresponding scanning line 113 and an independent common line 115.

Wherein the common level signal is in a period of two frames of the display panel, the level of the common level signal includes 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; and corresponding to the current pixel, at the time of the a-th frame, the switching time between the first common level and the second common level is not earlier than the opening time of the scanning line corresponding to the current pixel at the time of the a-th frame and not later than the opening time of the scanning line corresponding to the current pixel at the a + 1-th frame.

In the application, each actual pixel is controlled and driven by an independent scanning line 113, a data line 114 and a common line 115 respectively, every two pixels are in one group along the direction of the data line, the 2m-1 th pixel is a main pixel, the 2m th pixel is an auxiliary pixel, the data signals of the main pixel and the auxiliary pixel are the same in the same frame, the signals of the common line of each pixel are controlled independently, so that different common level signals can be set for each pixel, and further, by designing different first common level and second common level, when the common level signals of the main pixel and the auxiliary pixel on the common line are changed, due to the charge conservation effect among parasitic capacitance, storage capacitance and liquid crystal capacitance of the main pixel and the auxiliary pixel, the liquid crystal capacitance of the main pixel and the auxiliary pixel can be influenced when the common level signals are changed, the brightness of the main pixel and the auxiliary pixel changes along with the change of the brightness, and the main pixel and the auxiliary pixel become brighter or darker, so that two main pixels 130 and auxiliary pixels 131 with different brightness are formed; the brightness of the corresponding main/auxiliary pixel is changed by controlling the high-low switching of the common level of the common line, and the data signal is not required to be processed, namely, when the data signals of the main pixel 130 and the auxiliary pixel 131 are the same gray scale, the brightness difference of the main pixel 130 and the auxiliary pixel 131 can be automatically realized through the difference of the common level signals, and the effect of improving the color cast is achieved.

As shown in fig. 6 and 7, an embodiment of a driving method using dot inversion is adopted for the display panel 110 of the present application. The scanning lines respectively corresponding to the main pixel and the auxiliary pixel correspondingly output data signals with opposite polarities at adjacent opening moments; the data signals corresponding to the main pixel 130 and the auxiliary pixel 131 are both in dot inversion; the first common level 134 is a low level, the second common level 135 is a high level, and in the same frame, the common level signals of the main pixel 130 and the auxiliary pixel 131 are switched from the first common level 134 to the second common level 135, or from the second common level 135 to the first common level 134; the scan lines 113 corresponding to the main pixels 130 and the auxiliary pixels 131 respectively output data signals with opposite polarities at adjacent turn-on timings. Thus, the main pixel 130 and the auxiliary pixel 131 in the same pixel 111 correspond to the common level signal with the same switching direction, and when the common level signals corresponding to the main pixel 130 and the auxiliary pixel 131 are switched, because the polarities of the main pixel 130 and the auxiliary pixel 131 are opposite, a phenomenon of a difference between brightness of the main pixel 130 and that of the auxiliary pixel 131 occurs after the corresponding common level signals are switched, thereby achieving an effect of improving color cast.

Specifically, as shown in fig. 6 to 8, the scanning line 113 corresponding to the main pixel 130 of the same pixel 111 is the nth row scanning line 113, and the corresponding data line 114 is the mth column data line 114; the scanning line 113 corresponding to the auxiliary pixel 131 of the pixel 111 is the (n +1) th row scanning line 113, and the corresponding data line 114 is the m-th column data line 114. In the a-th frame, the polarity of the data signal of the data line 114 corresponding to the main pixel 130(m, n) is positive, i.e., the charge signal Vp (m, n) of the main pixel 130 is greater than the common level signal Vst (m, n); when the scanning line 113 in the nth row is charged, the scanning signal is turned off, the common level signal Vst (m, n) is switched from a relatively low voltage to a high voltage, and the charge conservation of the pixel exists among the parasitic capacitor, the storage capacitor, and the liquid crystal capacitor, so that the charging signal Vp (m, n) of the main pixel 130 is boosted up by Δ V due to the switching of the common level signal Vst (m, n) 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 brightness of the main pixel 130. In contrast, the auxiliary pixel 131 is driven with negative polarity during the charging of the a-th frame, the charging signal Vp (m, n +1) is smaller than the common level signal Vst (m, n +1), when the scanning line 113 of the n +1 th row is completely charged and the scanning signal is turned off, the common level signal Vst (m, n +1) is switched from a relatively low voltage to a high voltage, the charging signal Vp (m, n +1) of the auxiliary pixel 131 is boosted up by Δ V due to the switching of the common level signal Vst (m, n +1) from a relatively low voltage to a high voltage due to the charge conservation of the pixel among the parasitic capacitor, the storage capacitor, and the liquid crystal capacitor, i.e., the voltage difference between Vp (m, n +1) and the common level signal Vst (m, n +1) is changed from-x to-x + Δ V, the negative voltage is increased by Δ V, so that the brightness of the auxiliary pixel 131 is decreased, and the brightness is darker as shown by the hatching in fig. 9, to represent bright-dark contrast.

Similarly, when the a-th frame is switched to the a + 1-th frame, the Data signal Data (m, n) charged in the main pixel 130 is driven with a negative polarity, the charge signal Vp (m, n) is smaller than the common level signal Vst (m, n), when the scanning line 113 in the nth row is charged, the scanning signal is turned off, and the common level signal Vst (m, n) is switched from a relatively high voltage to a low voltage, since the pixel has charge conservation among the parasitic capacitance, the storage capacitance, and the liquid crystal capacitance, the charge signal Vp (m, n) of the main pixel 130 decreases by the voltage Δ V because the common level signal Vst (m, n) is switched from a relatively high voltage to a low voltage, i.e., the voltage difference between the charge signal Vp (m, n) of the main pixel 130 and the common level signal Vst (m, n) changes from-x to-x- Δ V, and the negative voltage decreases to increase the brightness of the main pixel 130. In contrast, the Data signal Data (m, n +1) charged by the auxiliary pixel 131 is driven with positive polarity during the a +1 th frame, i.e. the charging signal Vp (m, n +1) of the auxiliary pixel 131 is greater than the common level signal Vst (m, n +1), when the scanning line 113 in the (n +1) th row is completely charged, the scanning signal is turned off, the common level signal Vst (m, n +1) is switched from a relatively high voltage to a low voltage, and the charging signal Vp (m, n +1) of the auxiliary pixel 131 is decreased by Δ V due to the charge conservation of the pixel among the parasitic capacitor, the storage capacitor, and the liquid crystal capacitor, i.e. the voltage difference between the charging signal Vp (m, n +1) of the auxiliary pixel 131 and the common level signal Vst (m, n +1) is changed from x to Δ V, the reduction of the positive voltage reduces the brightness of the auxiliary pixel 131, thereby realizing the brightness difference between the main pixel 130 and the auxiliary pixel 131 and achieving the effect of improving color cast.

Of course, the arrangement of the main pixel and the auxiliary pixel in the same pixel may not be limited to the upper and lower arrangement, and the auxiliary pixel 131 may be the scanning line 113 corresponding to the nth row scanning line 113, and the corresponding data line 114 corresponding to the mth column data line 114, so that at this time, the scanning line 113 corresponding to the main pixel 130 is the nth row scanning line 113, and the corresponding data line 114 is the m +1 th column data line 114, that is, the left and right two adjacent pixels are the main pixel and the auxiliary pixel of the same pixel, respectively, also may be used.

Further, corresponding to each main pixel 130, the time difference between the starting time of the first common level or the second common level and the opening time of the scan line 113 corresponding to the current pixel at the current frame is equal; for each auxiliary pixel 131, the time difference between the starting time of the first common level or the second common level and the opening time of the scan line 113 corresponding to the current pixel at the current frame is equal. After the common level signals are switched, the charging signal Vp of the pixel generates a change of increasing or decreasing Δ v to maintain the brightness of the current pixel, and if the starting time of the first common level or the second common level of each main/auxiliary pixel is equal to the time difference of the scan line 113 corresponding to the current pixel at the turn-on time of the current frame, the duration of the corresponding brightness maintaining effect is equal, and the overall display uniformity is better.

Specifically, the time difference between the starting time of the first common level or the second common level corresponding to each of the main pixels 130 or each of the auxiliary pixels 131 and the opening time of the scan line 113 corresponding to the current pixel at the current frame may be equal, as shown in fig. 7, so that the time difference between the starting time of the first common level and the second common level of each of the main pixels 130 and each of the auxiliary pixels 131 and the time difference between the starting time of the scan line 113 corresponding to the current pixel at the opening time of the current frame are equal, the time duration corresponding to the effect of maintaining brightness is also equal, and the overall display uniformity is also improved. Of course, the time difference between the switching time of the first common level and the second common level corresponding to the main pixel 130 and the auxiliary pixel 131 corresponding to the same pixel and the time difference between the switching time of the common level corresponding to the scanning line 113 corresponding to the current pixel at the opening time of the current frame may not be equal, and as the switching time of the common level signal corresponding to the main pixel 130 and the auxiliary pixel 131 corresponding to the same pixel 111, as shown in fig. 8, in one frame time, the switching time of the common level signal of the main pixel 130 may be the opening time of the nth scanning line 113, and the switching time of the common level signal of the auxiliary pixel 131 may also be the opening time of the nth +1 scanning line 113, so that in one scanning period, the main pixel 130 and the auxiliary pixel 131 of each pixel 111 may generate brightness changes simultaneously, the main pixel 130 and the auxiliary pixel 131 are simultaneously made to generate a difference between brightness and darkness, thereby improving the effect of color cast. The setting can be performed by those skilled in the art according to actual needs.

More specifically, as shown in fig. 6, the first common level 134 or the second common level 135 of the common line 115 corresponding to the main pixel 130 can be flexibly selected within a frame time at the start time of the a-th frame, but if the selection is closer to the time when the current scan line is opened, the influence on the display screen due to too late common level switching can be avoided. If the current scan line is the nth scan line, the first common level 134 or the second common level 135 of the current common line may be later than the turn-on time of the current nth scan line at the start time of the a-th frame, but earlier than the turn-on time of the N +10 th scan line. As an alternative, the time for the next (N +1) th scanning line 113 of the scanning lines 113 corresponding to the main pixels 130 to be turned on is the same time as the time for the next scanning line 113 to be turned on in the middle of the turning-on time of the a-th frame; the first common level 134 or the second common level 135 of the common line 115 corresponding to the auxiliary pixel 131 is at a start time of an a-th frame which is half of an opening time of a next scanning line 113 of the scanning lines 113 corresponding to the auxiliary pixel 131 in the a-th frame. According to the scheme, the common level switching time corresponding to each main pixel 130 and each auxiliary pixel 131 is set at the middle time of the opening time of the next scanning line 113 of the corresponding scanning line 113, and during switching, the main pixel 130 and the auxiliary pixel 131 of each pixel 111 can simultaneously generate brightness change, so that the main pixel 130 and the auxiliary pixel 131 simultaneously generate brightness difference, and therefore the color cast effect is improved.

Wherein a, m, N, N and Y are positive integers; x and-x are the voltage values of the charging signals of the main/auxiliary pixel 131 after the scan signal is turned off.

As shown in fig. 9 and 10, an embodiment of a driving method using column inversion is applied to the display panel 110 of the present application. The data signals corresponding to the main pixel 130 and the auxiliary pixel 131 are both column-inverted; in the same frame, the common level signals of the main pixel 130 and the auxiliary pixel 131 are switched from the first common level 134 to the second common level 135, or are switched from the second common level 135 to the first common level 134; wherein the voltage value of the first common level 134 of the main pixel 130 is less than the voltage value of the second common level 135, and the voltage value of the first common level 134 of the auxiliary pixel 131 is greater than the voltage value of the second common level 135; the scanning lines 113 corresponding to the main pixels 130 correspondingly output data signals with opposite polarities at adjacent opening moments; meanwhile, the scan lines 113 corresponding to the auxiliary pixels 131 respectively output data signals with opposite polarities at adjacent turn-on timings. In the same frame, the main pixel 130 and the auxiliary pixel 131 correspond to common level signals with different switching directions, and if the main pixel 130 is switched from a low level signal to a high level signal, the auxiliary pixel 131 is correspondingly switched from the high level signal to the low level signal; if the main pixel 130 switches from a high level signal to a low level signal, the auxiliary pixel 131 switches from a low level signal to a high level signal. When the common level signals corresponding to the main pixel 130 and the auxiliary pixel 131 are switched, because the polarities of the data signals of the main pixel 130 and the auxiliary pixel 131 are the same, a phenomenon of difference between brightness of the main pixel 130 and the brightness of the auxiliary pixel 131 occurs after the corresponding common level signals are switched, so that the effect of improving color cast is achieved.

Specifically, as shown in fig. 9 to 11, an embodiment of the present application discloses a column inversion driving method, in which a scan line 113 corresponding to a main pixel 130 of a same pixel 111 is an nth row scan line 113, and a corresponding data line 114 is an mth column data line 114; the scanning line 113 corresponding to the auxiliary pixel 131 of the pixel 111 is the (n +1) th row scanning line 113, and the corresponding data line 114 is the m-th column data line 114.

In the a-th frame, the polarity of the data signal of the data line 114 corresponding to the main pixel 130(m, n) is positive, i.e., the charge signal Vp (m, n) of the main pixel 130 is greater than the common level signal Vst (m, n); when the scanning line 113 in the nth row is charged, the scanning signal is turned off, the common level signal Vst (m, n) is switched from a relatively low voltage to a high voltage, and the charge conservation of the pixel exists among the parasitic capacitor, the storage capacitor, and the liquid crystal capacitor, so that the charging signal Vp (m, n) of the main pixel 130 is boosted up by Δ V due to the switching of the common level signal Vst (m, n) 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 brightness of the main pixel 130. Similarly, the auxiliary pixel 131 is driven by positive polarity during the charging of the a-th frame, the charging signal Vp (m, n +1) is greater than the common level signal Vst (m, n +1), when the scanning line 113 in the n +1 th row is completely charged, the scanning signal is turned off, the common level signal Vst (m, n +1) is switched from a relatively high voltage to a low voltage, and the charging signal Vp (m, n +1) of the auxiliary pixel 131 is reduced by Δ V due to the fact that the pixel has charge conservation among the parasitic capacitor, the storage capacitor, and the liquid crystal capacitor, that is, the voltage difference between Vp (m, n +1) and the common level signal Vst (m, n +1) is changed from x to x- Δ V, and the positive voltage is reduced by Δ V, so that the brightness of the auxiliary pixel 131 is reduced.

When the a-th frame is switched to the a + 1-th frame, the Data signal Data (m, n) charged in the main pixel 130 is driven with a negative polarity, the charging signal Vp (m, n) is smaller than the common level signal Vst (m, n), when the scanning line 113 in the nth row is charged, the scanning signal is turned off, and the common level signal Vst (m, n) is switched from a relatively high voltage to a low voltage, since the pixel has charge conservation among the parasitic capacitance, the storage capacitance, and the liquid crystal capacitance, the charge signal Vp (m, n) of the main pixel 130 decreases by the voltage Δ V because the common level signal Vst (m, n) is switched from a relatively high voltage to a low voltage, i.e., the voltage difference between the charge signal Vp (m, n) of the main pixel 130 and the common level signal Vst (m, n) changes from-x to-x- Δ V, and the negative voltage decreases to increase the brightness of the main pixel 130. Similarly, the Data signal Data (m, n +1) charged by the auxiliary pixel 131 is driven with negative polarity during the a +1 frame, i.e. the charging signal Vp (m, n +1) of the auxiliary pixel 131 is smaller than the common level signal Vst (m, n +1), when the scanning line 113 in the (n +1) th row is completely charged, the scanning signal is turned off, the common level signal Vst (m, n +1) is switched from a relatively low voltage to a high voltage, and the charging signal Vp (m, n +1) of the auxiliary pixel 131 is boosted up by Δ V because the pixel has charge conservation among the parasitic capacitor, the storage capacitor, and the liquid crystal capacitor, i.e. the voltage difference between the charging signal Vp (m, n +1) of the auxiliary pixel 131 and the common level signal Vst (m, n +1) is changed from-x to-x + Δ V, the increase in the negative polarity voltage decreases the luminance of the auxiliary pixel 131.

The common level signals corresponding to the main pixel 130 and the auxiliary pixel 131 of the same pixel are switched to generate a brightness difference, so that color cast can be improved; of course, the pixel corresponding to the nth row scanning line 113 and the mth column data line 114 may also be the auxiliary pixel 131, and correspondingly, the pixel corresponding to the (n +1) th row scanning line 113 and the mth column data line 114 is the main pixel 130.

More specifically, the switching timing of the common level signal of the main pixel 130 and the sub pixel 131 of the dot inversion driven pixel 111 is required to be common to the column inversion driven pixel 111, and the same effect can be achieved.

Further, as shown in fig. 9 and 10, when the data signals corresponding to the main pixel 130 and the auxiliary pixel 131 are all column-inverted, the data signals corresponding to the main pixel 130 and the auxiliary pixel 131 of each pixel 111 are all polarity-inverted once for one frame, and two frames are one period. When the column inversion driving method is adopted, the polarities corresponding to the main pixel 130 and the auxiliary pixel 131 of each pixel 111 are the same, and then the brightness difference between the main pixel 130 and the auxiliary pixel 131 of each pixel 111 occurs after the common level signals corresponding to the main pixel 130 and the auxiliary pixel 131 are switched, so that the effect of improving color cast is achieved.

As another embodiment of the present application, different from the above-mentioned embodiments, the polarity of the data signal in the 4m +1 th frame and the 4m +2 th frame is the same and is opposite to the polarity in the 4m +3 th frame and the 4m +4 th frame corresponding to the same main/auxiliary pixel; where m is a natural number, that is, it can be considered that the nth pixel is divided into a main pixel and an auxiliary pixel, the polarities of the main pixel and the auxiliary pixel are the same, the (n +1) th pixel is divided into a main pixel and an auxiliary pixel, and the polarities of the main pixel and the auxiliary pixel are opposite.

As shown in fig. 12, an embodiment of the present application discloses a method for driving a display panel, further including the step of detecting a viewing angle mode of the display panel:

s1, judging the current display mode of the display panel;

s2, when the current display mode of the display panel is detected to be a wide view angle mode, sequentially outputting the first common level and the second common level to the common line to drive the display panel; and

and S3, outputting a constant third common level to the common line in one period of the common level signal to drive the display panel when the current display mode of the display panel is detected to be the narrow viewing angle mode.

Thus, according to the applied environmental requirements, when a wide viewing angle is required, as shown in fig. 8 and 11, the common electrode voltage is changed from direct current drive to high-low voltage drive, so that the main pixels and the auxiliary pixels of two adjacent rows are used as the main pixels and the auxiliary pixels of the same pixel and are displayed corresponding to the same gray scale, the resolution is reduced by one time, and the color cast of the wide viewing angle can be improved by respectively being brighter and darker; when a wide viewing angle is not needed, that is, in a narrow viewing angle mode, the main pixel and the auxiliary pixel may be two independent pixels, different gray scales may be independently displayed, any improvement on the structure is not needed, and the resolution may be doubled only by adjusting the common level signal output by the common line, as shown in fig. 13 and 14, the common electrode voltage is changed into the original dc driving mode, so that two adjacent rows of pixels are no longer displayed as the main pixel and the auxiliary pixel of the same pixel, and actually, the two independent pixels are still used to maintain the display of the original resolution image quality, thereby improving the practicability of the display panel 110 and the overall image quality display. The voltage value of the first common level 134 is equal to the voltage value of the constant third common level 136, so that the common level voltage does not need to be reset when the viewing angle is switched, and only the switching of the common level signal needs to be controlled, thereby facilitating implementation and reducing cost.

As shown in fig. 15, an embodiment of the present application further discloses a display device 100, where the display device 100 includes a display panel 110 and a driving module 120 for driving the display panel 110, the display panel 110 is configured to display a picture, and the driving module 120 is configured to drive the display panel 110; the driving module 120 includes a common level signal generating module 121, which outputs the common level signal to the display panel 110, and changes the brightness of the corresponding pixel by controlling the switching of the common level of the common line, so that even if the data signals of the main pixel and the auxiliary pixel are the same, the brightness difference between the main pixel and the auxiliary pixel can be automatically realized by the difference of the common level signal when the same gray scale is achieved, thereby achieving the effect of improving the color cast.

Correspondingly, the display panel 110 may further include a viewing angle switching module 112, where the viewing angle switching module 112 is configured to switch the viewing angle of the display panel 110 between a wide viewing angle and a narrow viewing angle, and perform the step of detecting the viewing angle mode of the display panel 110 as shown in fig. 13.

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 the steps should be considered as belonging to the protection scope of the present application.

The present application is applicable to the process of designing the image quality of a panel, which may be a TN (Twisted Nematic) panel, an IPS (In-plane switching) panel, a VA (Vertical Alignment) panel, or an MVA (Multi-domain Vertical Alignment) panel, and of course, may be other types of panels, and is applicable.

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

1. A driving method of a display panel, the driving method comprising the steps of:

wherein the common level signal is in a period of two frames of the display panel, the level of the common level signal includes 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, at the time of the a-th frame, the switching time between the first common level and the second common level is not earlier than the opening time of the scanning line corresponding to the current pixel at the time of the a-th frame and not later than the opening time of the scanning line corresponding to the current pixel at the a + 1-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 for driving a display panel according to claim 1, wherein when the scan lines corresponding to the main pixel and the sub pixel respectively output data voltages having opposite polarities at adjacent turn-on timings.

3. The method for driving a display panel according to claim 2, wherein the data signals corresponding to the main pixel and the auxiliary pixel are both dot inversion;

the voltage value of the first common level is smaller than that of the second common level, and in the same frame, common level signals corresponding to the main pixel and the auxiliary pixel are switched from the first common level to the second common level or from the second common level to the first common level.

4. The method of driving a display panel according to claim 2, wherein the data signals corresponding to the main pixel and the auxiliary pixel are both column-inverted;

in the same frame, common level signals corresponding to the main pixel and the auxiliary pixel are switched from the first common level to a second common level or are switched from the second common level to the first common level;

the voltage value of the first common level of the main pixel is smaller than that of the second common level, and the voltage value of the first common level of the auxiliary pixel is larger than that of the second common level.

5. The driving method of the display panel according to claim 1, wherein the data signals have the same polarity in the 4m +1 th frame and the 4m +2 th frame and the opposite polarity to the 4m +3 th frame and the 4m +4 th frame corresponding to the same main/auxiliary pixel;

wherein m is a natural number.

6. The method for driving a display panel according to claim 5, wherein the data signals corresponding to the main pixel and the auxiliary pixel are both dot inversion; in the same frame, the polarities of the main pixel and the auxiliary pixel corresponding to the same pixel of the data signal are opposite, and the polarities of the main pixel and the adjacent main pixel corresponding to the data signal are opposite;

7. The method for driving a display panel according to claim 5, wherein the data signals corresponding to the main pixels and the auxiliary pixels are column inversion; in the same frame, the polarities of the main pixel and the auxiliary pixel of the data signal corresponding to the same pixel are the same;

8. The method of driving the display panel according to claim 2 or 5, wherein the first common level or the second common level of the common line corresponding to the main pixel is the same time at a start time of an a-th frame as an intermediate time of an opening time of an a-th frame of a next scanning line of the scanning line corresponding to the main pixel;

the first common level or the second common level of the common line corresponding to the auxiliary pixel is the same time at the starting time of the a-th frame as the middle time of the opening time of the next scanning line of the scanning line corresponding to the auxiliary pixel in the a-th frame;

wherein a is a positive integer.

9. The driving method of the display panel according to claim 1, further comprising the step of detecting a viewing angle mode of the display panel:

10. A display device, comprising:

a display panel; and

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 two frames 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, at the a-th frame, the switching time between the first common level and the second common level is not earlier than the opening time of the scanning line corresponding to the current pixel at the a-th frame and not later than the opening time of the scanning line corresponding to the current pixel at the a + 1-th frame;

wherein a and m are positive integers.