CN109741713B - Driving method and driving system of display panel - Google Patents
Driving method and driving system of display panel Download PDFInfo
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- CN109741713B CN109741713B CN201910089367.8A CN201910089367A CN109741713B CN 109741713 B CN109741713 B CN 109741713B CN 201910089367 A CN201910089367 A CN 201910089367A CN 109741713 B CN109741713 B CN 109741713B
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Abstract
The invention discloses a driving method and a driving system of a display panel, wherein the driving method comprises the following steps: dividing sub-pixel signals corresponding to sub-pixels to be judged into a plurality of signal judgment intervals in advance; taking 2x adjacent sub-pixels to be judged with the same color as a group, calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged, and counting the number of the average values in each signal judgment interval; and determining that the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be judged are driven in a first adjusting mode or a second adjusting mode according to the statistical result.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method and a driving system for a display panel.
Background
Most of the large-sized liquid crystal display panels adopt a negative Vertical Alignment (VA) liquid crystal technology or an In-Plane Switching (IPS) liquid crystal technology, and the VA liquid crystal technology has the advantages of higher production efficiency and lower manufacturing cost compared with the IPS liquid crystal technology, but has a more significant optical property defect compared with the IPS liquid crystal technology In terms of optical property, and particularly, the large-sized panels need a larger viewing angle In commercial application, that is, have more serious color cast.
Therefore, how to improve color shift is an important research topic for those skilled in the art.
Disclosure of Invention
The invention aims to provide a driving method and a driving system of a display panel, which can improve color cast and reduce granular feeling.
The invention provides a driving method of a display panel, wherein the display panel comprises a plurality of pixels, and each pixel comprises a plurality of different-color sub-pixels; at least one of the sub-pixels is a sub-pixel to be judged, two adjacent sub-pixels to be judged with the same color are used as a sub-pixel group to be judged, and each sub-pixel group to be judged comprises a first sub-pixel and a second sub-pixel; the driving method includes the steps of:
dividing sub-pixel signals corresponding to sub-pixels to be judged into a plurality of signal judgment intervals in advance; counting the proportion of the number of the red sub-pixel signals in each signal judgment interval to the total number of the sub-pixel signals by taking the block as a unit; respectively judging whether the corresponding preset standard proportion values are met, and searching the interval with the maximum proportion in the intervals meeting the preset standard proportion values as the maximum proportion interval
Taking 2x adjacent sub-pixels to be judged with the same color as a group, calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged, and counting the number of the average values in each signal judgment interval; determining to drive a first sub-pixel and a second sub-pixel corresponding to the sub-pixel to be judged in a first adjusting mode or a second adjusting mode according to the statistical result;
under the first adjustment mode and the second adjustment mode, the average gray scales of sub-pixel signals corresponding to the first sub-pixel and the second sub-pixel are equivalent, and the gray scale difference is different; x is a natural number which is more than or equal to 1, and the value of 2x is less than the total number of the sub-pixels to be judged.
Optionally, the step of determining, according to the statistical result, to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined in the first adjustment manner or the second adjustment manner includes:
counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values, and respectively judging whether the average values meet corresponding preset standard proportion values;
and determining that the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be judged are driven in a first adjusting mode or a second adjusting mode according to the judgment result.
Optionally, the 2x adjacent sub-pixels to be determined of the same color are used as a group, an average value of sub-pixel signals corresponding to each group of sub-pixels to be determined is calculated, and the number of the average values in each signal determination interval is counted; the step of determining whether to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined in the first adjustment mode or the second adjustment mode according to the statistical result comprises the following steps:
taking 2x adjacent sub-pixels to be judged with the same color as a group, and calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged;
counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values, and respectively judging whether the average values meet corresponding preset standard proportion values;
and determining that the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be judged are driven in a first adjusting mode or a second adjusting mode according to the judgment result.
Optionally, the first adjustment manner is to average gray-scale values corresponding to original sub-pixel signals corresponding to a first sub-pixel and a second sub-pixel in each sub-pixel group to be determined, and then find corresponding sub-pixel high-voltage signals and sub-pixel low-voltage signals according to the average values and a preset lookup table, so as to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined; the second adjustment mode is to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined without processing the original sub-pixel signals corresponding to the first sub-pixel and the second sub-pixel in each sub-pixel group to be determined.
Optionally, the pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the sub-pixels to be judged are all red sub-pixels.
Optionally, the pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the sub-pixels to be judged comprise a first sub-pixel to be judged and a second sub-pixel to be judged, the first sub-pixel to be judged is all green sub-pixels, and the second sub-pixel to be judged is all red sub-pixels.
Optionally, the display panel divides the pixels into a plurality of blocks according to physical positions;
the 2x adjacent sub-pixels to be judged with the same color are taken as a group, the average value of the sub-pixel signals corresponding to each group of sub-pixels to be judged is calculated, and the number of the average values in each signal judgment interval is counted; the step of determining whether to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined in the first adjustment mode or the second adjustment mode according to the statistical result comprises the following steps:
taking each block as a unit, taking 2x adjacent sub-pixels to be judged with the same color as a group, calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
if the proportion of the number of the average values in the total number in each signal judgment interval meets a preset standard proportion value, driving a first sub-pixel and a second sub-pixel corresponding to all sub-pixels to be judged in the corresponding block in a second adjustment mode; otherwise, driving the first sub-pixel and the second sub-pixel corresponding to all the sub-pixels to be determined in the corresponding block in a first adjustment mode.
Optionally, the signal judgment interval is sequentially divided into i signal judgment intervals according to the gray scale of the sub-pixel signal of the sub-pixel to be judged, the signal gray scale corresponding to the first signal judgment interval is minimum, and the signal gray scale corresponding to the ith signal judgment interval is maximum; and the value of i is a natural number which is more than or equal to 2, and is less than or equal to the maximum gray scale level of the display panel.
The invention also provides a driving method of the display panel, wherein the display panel comprises a plurality of pixels; the display panel divides the pixels into a plurality of blocks according to physical position adjacency;
the pixels comprise red sub-pixels, green sub-pixels and blue sub-pixels; the pixels comprise a first to-be-determined sub-pixel and a second to-be-determined sub-pixel, the first to-be-determined sub-pixel is all green sub-pixels in a corresponding block, and the second to-be-determined sub-pixel is all red sub-pixels in the corresponding block; two adjacent green sub-pixels are used as a green judgment sub-pixel group, and each green judgment sub-pixel group comprises a first green sub-pixel and a second green sub-pixel; two adjacent red sub-pixels are used as a red judging sub-pixel group, and each red judging sub-pixel group comprises a first red sub-pixel and a second red sub-pixel; the driving method includes the steps of:
dividing sub-pixel signals corresponding to green sub-pixels into i signal judgment intervals in sequence according to the gray scale, and simultaneously dividing sub-pixel signals corresponding to red sub-pixels into j signal judgment intervals in sequence according to the gray scale; the value of i is a natural number which is more than or equal to 2 and is less than or equal to the maximum gray scale level of the display panel; j is a natural number more than or equal to 2 and less than or equal to the maximum gray scale level of the display panel;
calculating and counting the average value of sub-pixel signals corresponding to each group of green sub-pixels by taking the block as a unit and taking 2 adjacent green sub-pixels as a group, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
when the ratio of the number of the average values in the total number of the average values in each signal judgment interval meets the corresponding preset standard ratio value, original sub-pixel signals corresponding to a first green sub-pixel and a second green sub-pixel of each green judgment sub-pixel group are not processed and are used for driving the corresponding first green sub-pixel and the corresponding second green sub-pixel in the block; otherwise, after averaging the gray-scale values corresponding to the original sub-pixel signals corresponding to the first green sub-pixel and the second green sub-pixel in each green judgment sub-pixel group, finding the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, and driving the corresponding first green sub-pixel and the corresponding second green sub-pixel in the block;
calculating and counting the average value of the sub-pixel signals corresponding to each group of red sub-pixels by taking the block as a unit and taking 2 adjacent red sub-pixels as a group, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
when the ratio of the number of the average values in the total number of the average values in each signal judgment interval meets the corresponding preset standard ratio value, original sub-pixel signals corresponding to a first red sub-pixel and a second red sub-pixel of each red judgment sub-pixel group are not processed and are used for driving the corresponding first red sub-pixel and second red sub-pixel in the block; otherwise, after averaging the gray-scale values corresponding to the original sub-pixel signals corresponding to the first red sub-pixel and the second red sub-pixel in each red judgment sub-pixel group, finding the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, and driving the corresponding first red sub-pixel and second red sub-pixel in the block;
performing grouping of two adjacent blue sub-pixels, averaging the gray scale values corresponding to the corresponding original sub-pixel signals, and finding out corresponding sub-pixel high-voltage signals and sub-pixel low-voltage signals according to the average values and a preset lookup table so as to drive the two adjacent blue sub-pixels in the block respectively;
the average gray scale of the sub-pixel high-voltage signal and the sub-pixel low-voltage signal corresponding to each sub-pixel group to be determined is equivalent to the average gray scale of the two corresponding original sub-pixel signals; the gray scale difference between the sub-pixel high voltage signal and the sub-pixel low voltage signal is larger than the gray scale difference between the two corresponding original sub-pixel signals.
The invention also provides a driving system of a display panel, wherein the display panel comprises a plurality of pixels, each pixel comprises a sub-pixel to be judged, and the sub-pixel to be judged comprises a main sub-pixel and a sub-pixel; the drive system includes: the interval division module divides sub-pixel signals corresponding to the sub-pixels to be judged into a plurality of signal judgment intervals in advance; taking 2x adjacent sub-pixels to be judged with the same color as a group, calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged, and counting the number of the average values in each signal judgment interval; determining a processing module for driving a first sub-pixel and a second sub-pixel corresponding to the sub-pixel to be judged in a first adjusting mode or a second adjusting mode according to the statistical result; wherein x is a natural number greater than or equal to 1, and the value of 2x is less than the total number of the sub-pixels to be determined.
Compared with the scheme that the color cast is improved by dividing each pixel into main and sub pixels and connecting a discharge switch and a discharge capacitor to the sub pixels for convenience, the main pixel and the sub pixels have different charging voltages. In the invention, 2n sub-pixel signals are taken as a group to calculate an average value according to the sub-pixel signals of the sub-pixels to be judged, then the number of the average values in each signal judgment interval is counted, the distribution condition of the current picture can be judged according to the number of the average values in each signal interval, and the adjustment mode is selected according to the number; if the signal distribution of the current picture is balanced, an adjusting mode with smaller gray scale difference is selected to drive the sub-pixel to be judged, and the signal distribution is wide, so that the adjusting mode with smaller gray scale difference can be used, and the granular sensation can be improved while no serious color cast is generated; similarly, if the signal distribution of the current picture in each signal judgment interval is not uniform and local color cast is easy to occur, an adjustment mode with larger gray scale difference can be selected to drive the sub-pixels to be judged so as to improve the color cast; therefore, the adjustment mode is selected according to the actual situation of the current picture, and the display effect of the picture can be better improved.
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 first schematic diagram of a pixel being divided into primary/secondary pixels according to an embodiment of the invention;
FIG. 2 is a second schematic diagram of a pixel being divided into primary/secondary pixels according to an embodiment of the invention;
FIG. 3 is a flowchart illustrating a driving method of a display panel according to an embodiment of the invention;
FIG. 4 is a flowchart illustrating a driving method of a display panel according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a pixel arrangement of a display panel according to an embodiment of the invention;
FIG. 6 is a schematic diagram illustrating pixel signal driving of a display panel according to an embodiment of the invention;
FIG. 7 is a flowchart illustrating a driving method of a display panel according to another embodiment of the present invention;
fig. 8 is a schematic diagram of a driving system of a display panel according to an embodiment of the invention.
10, a driving system; 100. an interval division module; 200. and a processing module.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may 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, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
An exemplary solution is to subdivide each Sub-pixel of RGB (Red, Green, Blue) into primary/secondary pixels (Main/Sub) so that the overall large-view luminance is closer to the front view with voltage variation.
Fig. 1 is a first schematic diagram of a pixel divided into primary/secondary pixels, and fig. 2 is a second schematic diagram of a pixel divided into primary/secondary pixels, as can be seen with reference to fig. 1 and 2, wherein the x-coordinate, the y-coordinate, and the z-coordinate respectively represent three directions of a three-dimensional space; the thetaa represents the pretilt angle at which the main pixel has a large voltage, and the thetab represents the pretilt angle at which the sub pixel has a small voltage.
Specifically, the original signal is divided into a primary pixel and a secondary pixel with large voltage and small voltage, the front-view large voltage and the small voltage are added to maintain the change of the original front-view signal along with the brightness, the side-view brightness seen by the large voltage changes along with the gray scale as PartA in fig. 1, and the side-view brightness seen by the small voltage changes along with the gray scale as PartB in fig. 1. Therefore, the brightness of the side view synthesis is changed from the arc line segments of the two dotted lines to the arc line segments of the solid line along with the change of the gray scale, so that the change relation of the brightness of the view angle along with the signal is close to that of the brightness of the front view original signal along with the change of the signal, and the view angle is improved. The defect of color deviation of a viewing angle is solved by applying different driving voltages to the main pixel and the sub-pixel in space, so that the design of the pixel usually needs to design a metal wire or a Thin Film Transistor (TFT) element to drive the sub-pixel, the light-permeable opening area is sacrificed, the panel transmittance is influenced, and the backlight cost is directly improved.
The invention is described in detail below with reference to the figures and alternative embodiments.
Fig. 3 is a flowchart of a driving method of a display panel according to another embodiment of the present invention, and fig. 4 is a flowchart of a driving method of a display panel according to another embodiment of the present invention, as can be seen from fig. 3 and 4, the present invention further provides a driving method of a display panel, where the display panel includes a plurality of pixels, and each of the pixels includes a plurality of sub-pixels with different colors; at least one of the sub-pixels is a sub-pixel to be judged, two adjacent sub-pixels to be judged with the same color are used as a sub-pixel group to be judged, and each sub-pixel group to be judged comprises a first sub-pixel and a second sub-pixel; the driving method includes the steps of:
s11, dividing the sub-pixel signal corresponding to the sub-pixel to be judged into a plurality of signal judgment intervals in advance;
s12, taking 2x adjacent sub-pixels to be judged with the same color as a group, calculating the average value of the sub-pixel signals corresponding to each group of sub-pixels to be judged, and counting the number of the average values in each signal judgment interval; determining to drive a first sub-pixel and a second sub-pixel corresponding to the sub-pixel to be judged in a first adjusting mode or a second adjusting mode according to the statistical result;
under the first adjustment mode and the second adjustment mode, the average gray scales of sub-pixel signals corresponding to the first sub-pixel and the second sub-pixel are equivalent, and the gray scale difference is different; x is a natural number which is more than or equal to 1, and the value of 2x is less than the total number of the sub-pixels to be judged. The adjacent means that the sub-pixels of the same color are adjacent to each other at the positions along the scan line or along the data line in the display panel, for example, in fig. 5, the R1,1 and R2,1 are adjacent to each other along the data line, and of course, the display panel has different architectures and can also be adjacent to each other along the scan line; similarly, 2x adjacent subpixels to be determined in the same color are in a group, the average values are respectively calculated, and the value of x can be modified according to the preset value, and can be 2, 4, 6 …, and the like.
As shown in fig. 1 and 2, the main pixel and the sub pixel have different charging voltages to improve color shift by dividing each pixel into main and sub pixels and connecting a discharging switch and a discharging capacitor to the sub pixel for convenience. In the invention, 2n sub-pixel signals are taken as a group to calculate an average value according to the sub-pixel signals of the sub-pixels to be judged, then the number of the average values in each signal judgment interval is counted, the distribution condition of the current picture can be judged according to the number of the average values in each signal interval, and the adjustment mode is selected according to the number; if the signal distribution of the current picture is balanced, an adjusting mode with smaller gray scale difference is selected to drive the sub-pixel to be judged, and the signal distribution is wide, so that the adjusting mode with smaller gray scale difference can be used, and the granular sensation can be improved while no serious color cast is generated; similarly, if the signal distribution of the current picture in each signal judgment interval is not uniform and local color cast is easy to occur, an adjustment mode with larger gray scale difference can be selected to drive the sub-pixels to be judged so as to improve the color cast; therefore, the adjustment mode is selected according to the actual situation of the current picture, and the display effect of the picture can be better improved.
The average gray scale, i.e. the gray scale value of the sub-pixel signal corresponding to the first sub-pixel, is equal to the average value of the gray scale values of the sub-pixel signal corresponding to the second sub-pixel, i.e. the average brightness of the first sub-pixel and the second sub-pixel is equivalent in the first adjustment mode and the second adjustment mode. The average gray levels are equivalent, that is, the average gray levels of the first sub-pixel and the second sub-pixel are the same in the first adjustment mode and the second adjustment mode, and certainly, the average gray levels of the first sub-pixel and the second sub-pixel are not completely consistent in the first adjustment mode and the second adjustment mode, but the difference between the average gray levels is smaller than a preset range, for example, when the error is smaller than 0.5 gray level, the two average gray levels can be considered to be equivalent in size.
In an embodiment of the present invention, the 2x adjacent sub-pixels to be determined of the same color are taken as a group, an average value of sub-pixel signals corresponding to each group of sub-pixels to be determined is calculated, and the number of the average values in each signal determination interval is counted; the step S12 of determining whether to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined in the first adjustment manner or the second adjustment manner according to the statistical result includes:
s121, taking 2x adjacent sub-pixels to be judged with the same color as a group, and calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged;
s122: counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values, and respectively judging whether the average values meet corresponding preset standard proportion values;
s123: and determining that the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be judged are driven in a first adjusting mode or a second adjusting mode according to the judgment result. In the embodiment, the ratio of the number of the average values in each signal judgment interval to the total number of the average values is calculated, so that the signal distribution condition can be more clearly expressed, and a more applicable adjustment mode can be selected; the preset standard proportion value is set to be hooked with the number of the divided signal judgment intervals, when the number of the signal judgment intervals is large, the preset standard proportion value is small, and when the number of the signal judgment intervals is small, the preset standard proportion value is large; for example, when the number of the signal determination sections is 3, the preset criterion proportion value of the three signal determination sections may be Gth 1-Gth 2-Gth 3-30%, and of course, the preset criterion proportion value may be set differently and adjusted according to actual conditions.
In an embodiment of the present invention, the step of calculating an average value of sub-pixel signals corresponding to each group of sub-pixels to be determined with 2x adjacent sub-pixels to be determined of the same color as a group, and counting the number of the average values located in each signal determination interval includes: taking 2 adjacent sub-pixels to be judged as a group, and calculating and counting the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged; and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values. In this embodiment, two adjacent to-be-determined subpixels are a first subpixel and a second subpixel in the same to-be-determined subpixel group; the two sub-pixel signals are used as a group to calculate an average value, so that the calculation amount can be reduced, and meanwhile, the signal distribution condition of the current picture can be well judged according to the actual condition of each sub-pixel.
In an embodiment of the present invention, the first adjustment manner is to average gray-scale values corresponding to original sub-pixel signals corresponding to a first sub-pixel and a second sub-pixel in each sub-pixel group to be determined, and then find corresponding sub-pixel high-voltage signals and sub-pixel low-voltage signals according to the average values and a preset lookup table, so as to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined; the second adjustment mode is to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined without processing the original sub-pixel signals corresponding to the first sub-pixel and the second sub-pixel in each sub-pixel group to be determined. In this embodiment, in the first adjustment mode, the sub-pixel high-voltage signal and the sub-pixel low-voltage signal are used to realize the display of one brightness, so that the color cast can be better improved; in the second adjustment mode, the gray scale difference of the original sub-pixel signals corresponding to the first sub-pixel and the second sub-pixel is smaller, so that the granular sensation can be obviously improved; different adjustment modes are selected according to different conditions to drive the sub-pixels to be judged, and the display effect can be effectively improved.
The judgment condition of the present invention varies with different design requirements of the display panel, and an embodiment is specifically illustrated to better explain the scheme of the present invention, wherein, the corresponding relationship of the lookup table related to the embodiment is merely an example for easy understanding, and does not constitute a limitation to the present invention, as long as the technical scheme of the present invention is met, the protection scope of the present invention should be included, and the specific lookup table is as follows:
as shown in table 1, the average value Rave of the sub-pixel signals of the red sub-pixel, the corresponding first sub-pixel signal and the corresponding second sub-pixel signal, and the sub-pixel high voltage signal RH and the sub-pixel low voltage signal RL correspond to each other as follows (the unit in the table is gray scale):
table 1 red subpixel lookup table
As shown in table 2, the green sub-pixel, the average value Gave of the sub-pixel signals of the corresponding first sub-pixel and second sub-pixel signals, and the sub-pixel high voltage signal GH and the sub-pixel low voltage signal GL are corresponding as follows (the unit in the table is gray scale):
table 2 green subpixel lookup table
Of course, the lookup table shown above is only an exemplary lookup table to illustrate the present invention more clearly, but not to represent that the lookup table of the present invention can only use the above lookup table; taking Rave equal to 50 as an example, in the first driving mode, the gray levels of the sub-pixel signals corresponding to the first sub-pixel and the second sub-pixel may be 100 and 3, or 90 and 13, depending on the actual requirement.
Referring to tables 1 and 2, if the gray scale difference between RH and RL corresponding to the red subpixel is slightly larger than the gray scale difference between GH and GL corresponding to the green subpixel, then only the red subpixel may be set as the subpixel to be determined, and certainly, if the gray scale difference between the green subpixels set on other panels is larger, the green subpixel may also be set as the subpixel to be determined. Of course, it is also possible to set the red sub-pixel and the green sub-pixel as the sub-pixels to be determined at the same time.
Fig. 5 is a schematic diagram of a pixel arrangement of a display panel of the invention, fig. 6 is a schematic diagram of a pixel signal driving of a display panel of the invention, and referring to fig. 5 and 6, it can be known from fig. 3 and 4 that: r1,1, G1,1 and B1,1 corresponding to the dotted frame shown in fig. 5 is a pixel unit; the illustrated pixel unit includes n rows and m columns, which total n × m pixel units, where the n × m pixel units may be the number of pixels of the entire display panel or the number of pixels of one tile.
The virtual frame shown in fig. 6 corresponds to a group of corresponding first to-be-determined sub-pixels and second to-be-determined sub-pixels, and the physical positions of the two corresponding to-be-determined sub-pixels are adjacent to each other, so as to realize the presentation of an average gray scale. The blue sub-pixels can be driven by adopting an adjusting mode with large gray scale difference.
In one embodiment, the pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the sub-pixels to be judged are all red sub-pixels.
In this embodiment, a color sub-pixel with stronger granular sensation is preferentially set as a sub-pixel to be determined, and the sub-pixel to be determined may be a red sub-pixel or a green sub-pixel; referring to tables 1 and 2, the luminance difference of the red sub-pixel is greater than that of the green sub-pixel, so the red sub-pixel is set as the sub-pixel to be determined to better improve color shift and graininess; of course, the to-be-determined sub-pixel may also be set as a green sub-pixel; in addition, only one of the sub-pixels is set as the sub-pixel to be determined, the number of the sub-pixels driven in the first adjustment mode can be reduced or increased according to the situation, and meanwhile, the rest two sub-pixels can be driven in the first adjustment mode to improve color cast. Of course, the remaining two sub-pixels are not judged, and the second adjustment mode is used for driving by default to improve the granular sensation better.
In an embodiment of the present invention, the pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the sub-pixels to be judged comprise a first sub-pixel to be judged and a second sub-pixel to be judged, the first sub-pixel to be judged is all green sub-pixels, and the second sub-pixel to be judged is all red sub-pixels.
In this embodiment, when the luminance difference between the red sub-pixel and the green sub-pixel is large, human eyes can more sensitively feel granular sensation, so that the red sub-pixel and the green sub-pixel are used as the sub-pixels to be determined, and the adjustment modes are respectively determined and selected, so that the color cast and the granular sensation can be better improved according to the signal conditions of the red sub-pixel and the green sub-pixel.
The color shift of the blue color system is not very serious, so that the blue sub-pixel is not used as the sub-pixel to be judged, and the driving mode with smaller gray scale difference is used for driving by default to improve the granular sensation; of course, since the human eye is not very sensitive to blue, the graininess of the blue color system is not very serious, and thus the driving method with larger gray scale difference can be used as a default to improve the color shift. In addition, the red sub-pixel, the green sub-pixel and the blue sub-pixel may be set as the sub-pixels to be determined, but the blue sub-pixel is driven by the first adjustment method only when the gray scale difference between the corresponding sub-pixel high voltage signal and the corresponding sub-pixel low voltage signal is greater than 100 gray scales.
In an embodiment of the invention, the display panel divides the pixels into a plurality of blocks according to physical positions;
the 2x adjacent sub-pixels to be judged with the same color are taken as a group, the average value of the sub-pixel signals corresponding to each group of sub-pixels to be judged is calculated, and the number of the average values in each signal judgment interval is counted; the step of determining whether to drive the first sub-pixel and the second sub-pixel corresponding to the sub-pixel to be determined in the first adjustment mode or the second adjustment mode according to the statistical result comprises the following steps:
taking each block as a unit, taking 2x adjacent sub-pixels to be judged with the same color as a group, calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
if the proportion of the number of the average values in the total number in each signal judgment interval meets a preset standard proportion value, driving a first sub-pixel and a second sub-pixel corresponding to all sub-pixels to be judged in the corresponding block in a second adjustment mode; otherwise, driving the first sub-pixel and the second sub-pixel corresponding to all the sub-pixels to be determined in the corresponding block in a first adjustment mode. In the embodiment, the pixels of the display panel are divided into a plurality of blocks according to the physical positions, the red sub-pixel and the green sub-pixel of each block are respectively used as the sub-pixels to be judged, and the red sub-pixel and the green sub-pixel of each block are independently calculated and judged to select an appropriate adjustment mode.
The dividing of the pixels into blocks by physical adjacent positions means that a predetermined number of pixels are taken as a block in the direction of the data line and the scan line, for example, 10 pixels are taken in the direction of the data line, and 10 pixels are taken in the direction of the scan line, so that a block including 10 × 10 pixels is obtained, and the display panel can be divided into a plurality of blocks by the analogy.
In an embodiment of the present invention, the signal determination section is sequentially divided into i signal determination sections according to gray scale of sub-pixel signals of sub-pixels to be determined, where a signal gray scale corresponding to a first signal determination section is the smallest, and a signal gray scale corresponding to an i-th signal determination section is the largest; and the value of i is a natural number which is more than or equal to 2, and is less than or equal to the maximum gray scale level of the display panel.
In the embodiment, the signal judgment interval is sequentially divided according to the signal gray scale of the sub-pixel signal, wherein when the sub-pixel signal corresponding to the signal judgment interval is correspondingly close to the 0 gray scale and the 255 gray scale, the gray scale difference between the sub-pixel high voltage signal and the sub-pixel low voltage signal is small, and the granular sensation is weak, at this time, the corresponding sub-pixel to be judged can be driven by using a first adjustment mode, so that the color cast can be improved without bringing obvious granular sensation; the granularity is obvious when the signal judgment interval is correspondingly close to the middle gray scale, for example, when the signal judgment interval is close to the 50 gray scale, at the moment, the first adjustment mode can be selected to drive the corresponding sub-pixel to be judged so as to better improve the granularity.
The method comprises the steps of obtaining a high-voltage signal of a sub-pixel and a low-voltage signal of the sub-pixel, wherein the high-voltage signal of the sub-pixel and the low-voltage signal of the sub-pixel which have different gray scale differences are possibly set corresponding to the same average value according to different design requirements of a display panel, so that the judging step of the method is correspondingly adjusted according to different display panels; for reference, if the gray scale difference between the sub-pixel high voltage signal and the sub-pixel low voltage signal corresponding to the signal determination interval is greater than 50, or the luminance difference is greater than 50 nit, the corresponding sub-pixel to be determined can be driven by using the second adjustment mode; on the contrary, if the gray scale difference between the sub-pixel high voltage signal and the sub-pixel low voltage signal corresponding to the signal determination section is less than or equal to 50, or the luminance difference is less than or equal to 50 nits, the corresponding sub-pixel to be determined can be driven by using the first adjustment mode.
Fig. 7 is a flowchart of another driving method of a display panel according to the present invention, and referring to fig. 5, in conjunction with fig. 3 and 6, the present invention further provides a driving method of a display panel, where the display panel includes a plurality of pixels; the display panel divides the pixels into a plurality of blocks according to physical position adjacency; the pixels comprise red sub-pixels, green sub-pixels and blue sub-pixels; the pixels comprise a first to-be-determined sub-pixel and a second to-be-determined sub-pixel, the first to-be-determined sub-pixel is all green sub-pixels in a corresponding block, and the second to-be-determined sub-pixel is all red sub-pixels in the corresponding block; two adjacent green sub-pixels are used as a green judgment sub-pixel group, and each green judgment sub-pixel group comprises a first green sub-pixel and a second green sub-pixel; two adjacent red sub-pixels are used as a red judging sub-pixel group, and each red judging sub-pixel group comprises a first red sub-pixel and a second red sub-pixel;
the driving method includes the steps of:
s21, dividing the sub-pixel signal corresponding to the green sub-pixel into i signal judgment intervals according to the gray scale in advance, and simultaneously dividing the sub-pixel signal corresponding to the red sub-pixel into j signal judgment intervals according to the gray scale in advance; the value of i is a natural number which is more than or equal to 2 and is less than or equal to the maximum gray scale level of the display panel; j is a natural number more than or equal to 2 and less than or equal to the maximum gray scale level of the display panel;
s22, calculating and counting the average value of the sub-pixel signals corresponding to each group of green sub-pixels by taking the block as a unit and taking 2 adjacent green sub-pixels as a group, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
s23, when the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value, the original sub-pixel signals corresponding to the first green sub-pixel and the second green sub-pixel of each green judgment sub-pixel group are not processed and are used for driving the corresponding first green sub-pixel and the corresponding second green sub-pixel in the block; otherwise, after averaging the gray-scale values corresponding to the original sub-pixel signals corresponding to the first green sub-pixel and the second green sub-pixel in each green judgment sub-pixel group, finding the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, and driving the corresponding first green sub-pixel and the corresponding second green sub-pixel in the block;
s24, calculating and counting the average value of the sub-pixel signals corresponding to each group of red sub-pixels by taking the block as a unit and taking 2 adjacent red sub-pixels as a group, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
s25, when the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value, the original sub-pixel signals corresponding to the first red sub-pixel and the second red sub-pixel of each red judgment sub-pixel group are not processed and are used for driving the corresponding first red sub-pixel and the corresponding second red sub-pixel in the block; otherwise, after averaging the gray-scale values corresponding to the original sub-pixel signals corresponding to the first red sub-pixel and the second red sub-pixel in each red judgment sub-pixel group, finding the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, and driving the corresponding first red sub-pixel and second red sub-pixel in the block;
s26, performing grouping of two adjacent blue sub-pixels, averaging the gray scale values corresponding to the corresponding original sub-pixel signals, and finding out the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, so as to drive the two adjacent blue sub-pixels in the block respectively;
the average gray scale of the sub-pixel high-voltage signal and the sub-pixel low-voltage signal corresponding to each sub-pixel group to be determined is equivalent to the average gray scale of the two corresponding original sub-pixel signals; the gray scale difference between the sub-pixel high voltage signal and the sub-pixel low voltage signal is larger than the gray scale difference between the two corresponding original sub-pixel signals.
In this embodiment, on the premise of no conflict, the above steps S21, S22, S23, S24, S25 and S26 may be executed synchronously or sequentially. Of course, the determination conditions of the present invention are different according to the difference of the display panel, but at least the signal determination section with the largest gray scale difference needs to select the second adjustment method to drive the corresponding sub-pixel to be determined. Meanwhile, at least the signal judgment section with the minimum gray scale difference needs to be driven by a first adjustment mode.
The maximum values of i and j depend on the gray scale division of the image, for example, if the brightness of the display device is divided into 128 levels, the maximum gray scale level is 128, and the maximum value of the corresponding i is 128; when the gray scale level is divided into 512 levels, the maximum gray scale level is 512, and the corresponding maximum value of i is 512; similarly, other gray scale division schemes are possible.
Fig. 8 is a schematic diagram of a driving system of a display panel according to the present invention, and referring to fig. 8, the present invention further provides a driving system of a display panel, where the display panel includes a plurality of pixels, each of the pixels includes a sub-pixel to be determined, and the sub-pixel to be determined includes a main sub-pixel and a sub-pixel; the drive system 10 includes: a section dividing module 100 for dividing a sub-pixel signal corresponding to a sub-pixel to be determined into a plurality of signal determination sections in advance; the processing module 200 is used for calculating the average value of the sub-pixel signals corresponding to each group of sub-pixels to be judged by taking 2x adjacent sub-pixels to be judged with the same color as a group, and counting the number of the average values in each signal judgment interval; the processing module 200 determines to drive a first sub-pixel and a second sub-pixel corresponding to the sub-pixel to be determined in a first adjustment mode or a second adjustment mode according to the statistical result; wherein x is a natural number greater than or equal to 1, and the value of 2x is less than the total number of the sub-pixels to be determined.
It should be noted that, the limitations of the steps involved 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 disclosure.
The technical scheme of the invention can be combined and applied on the premise of no conflict.
The technical solution of the present invention can be widely applied to various display panels, such as a Twisted Nematic (TN) display panel, an In-Plane Switching (IPS) display panel, a Vertical Alignment (VA) display panel, and a Multi-Domain Vertical Alignment (MVA) display panel, and of course, other types of display panels, such as an Organic Light-Emitting Diode (OLED) display panel, can be applied to the above solution.
The foregoing is a more detailed description of the invention in connection with specific alternative embodiments, and the practice of the invention should not be construed as limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (2)
1. A driving method of a display panel, wherein the display panel includes a plurality of pixels; the display panel divides the pixels into a plurality of blocks according to physical position adjacency;
the pixels comprise red sub-pixels, green sub-pixels and blue sub-pixels; the pixels comprise a first to-be-determined sub-pixel and a second to-be-determined sub-pixel, the first to-be-determined sub-pixel is all green sub-pixels in a corresponding block, and the second to-be-determined sub-pixel is all red sub-pixels in the corresponding block;
two adjacent green sub-pixels are used as a green judgment sub-pixel group, and each green judgment sub-pixel group comprises a first green sub-pixel and a second green sub-pixel; two adjacent red sub-pixels are used as a red judging sub-pixel group, and each red judging sub-pixel group comprises a first red sub-pixel and a second red sub-pixel;
the driving method includes the steps of:
dividing sub-pixel signals corresponding to green sub-pixels into i signal judgment intervals in sequence according to the gray scale, and simultaneously dividing sub-pixel signals corresponding to red sub-pixels into j signal judgment intervals in sequence according to the gray scale; the value of i is more than or equal to 2 and less than or equal to the maximum gray scale level of the display panel; j is a natural number more than or equal to 2 and less than or equal to the maximum gray scale level of the display panel;
calculating and counting the average value of sub-pixel signals corresponding to each group of green sub-pixels by taking the block as a unit and taking 2 adjacent green sub-pixels as a group, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
when the ratio of the number of the average values in the total number of the average values in each signal judgment interval meets the corresponding preset standard ratio value, original sub-pixel signals corresponding to a first green sub-pixel and a second green sub-pixel of each green judgment sub-pixel group are not processed and are used for driving the corresponding first green sub-pixel and the corresponding second green sub-pixel in the block; otherwise, after averaging the gray-scale values corresponding to the original sub-pixel signals corresponding to the first green sub-pixel and the second green sub-pixel in each green judgment sub-pixel group, finding the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, and driving the corresponding first green sub-pixel and the corresponding second green sub-pixel in the block;
calculating and counting the average value of the sub-pixel signals corresponding to each group of red sub-pixels by taking the block as a unit and taking 2 adjacent red sub-pixels as a group, and counting the proportion of the number of the average values in each signal judgment interval to the total number of the average values; respectively judging whether the ratio of the number of the average values in each signal judgment interval to the total number of the average values meets the corresponding preset standard ratio value;
when the ratio of the number of the average values in the total number of the average values in each signal judgment interval meets the corresponding preset standard ratio value, original sub-pixel signals corresponding to a first red sub-pixel and a second red sub-pixel of each red judgment sub-pixel group are not processed and are used for driving the corresponding first red sub-pixel and second red sub-pixel in the block; otherwise, after averaging the gray-scale values corresponding to the original sub-pixel signals corresponding to the first red sub-pixel and the second red sub-pixel in each red judgment sub-pixel group, finding the corresponding sub-pixel high-voltage signal and sub-pixel low-voltage signal according to the average value and a preset lookup table, and driving the corresponding first red sub-pixel and second red sub-pixel in the block;
performing grouping of two adjacent blue sub-pixels, averaging the gray scale values corresponding to the corresponding original sub-pixel signals, and finding out corresponding sub-pixel high-voltage signals and sub-pixel low-voltage signals according to the average values and a preset lookup table so as to drive the two adjacent blue sub-pixels in the block respectively;
the average gray scale of the sub-pixel high-voltage signal and the sub-pixel low-voltage signal corresponding to each sub-pixel group to be determined is equivalent to the average gray scale of the two corresponding original sub-pixel signals; the gray scale difference between the sub-pixel high voltage signal and the sub-pixel low voltage signal is larger than the gray scale difference between the two corresponding original sub-pixel signals.
2. A driving system of a display panel using the driving method of the display panel according to any one of claim 1, wherein the display panel includes a plurality of pixels, each of the pixels includes a sub-pixel to be determined, and the sub-pixel to be determined includes a main sub-pixel and a sub-pixel;
the drive system includes:
the interval division module is used for dividing sub-pixel signals corresponding to the sub-pixels to be judged into a plurality of signal judgment intervals in advance;
the processing module is used for calculating the average value of sub-pixel signals corresponding to each group of sub-pixels to be judged by taking 2x adjacent sub-pixels to be judged with the same color as one group, and counting the number of the average values in each signal judgment interval; determining to drive a first sub-pixel and a second sub-pixel corresponding to the sub-pixel to be judged in a first adjusting mode or a second adjusting mode according to the statistical result;
wherein x is a natural number greater than or equal to 1, and the value of 2x is less than the total number of the sub-pixels to be determined.
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