CN115188313A - Control method and device of display panel, display equipment and storage medium - Google Patents
Control method and device of display panel, display equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a control method and a control device of a display panel, display equipment and a storage medium, wherein the display panel comprises a plurality of pixels arranged in an array, and the control method of the display panel comprises the following steps: acquiring a first mapping relation between the display brightness and the gray scale of pixels in a first frame picture and a second mapping relation between the display brightness and the gray scale of pixels in a second frame picture when the gray scale of 0 is switched to other gray scales; if the data signal of the pixel in the current display picture is the data signal corresponding to the 0 gray scale, acquiring the display gray scale of the pixel in the next display picture; determining target display brightness corresponding to the display gray scale of the pixel according to the second mapping relation; determining a target gray scale of the pixel according to the first mapping relation and the target display brightness; and when a first frame of picture of the next display picture is displayed, providing a data signal corresponding to the target gray scale for the pixel. The technical scheme of the invention can improve the display uniformity of the display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for controlling a display panel, a display device, and a storage medium.
Background
At present, electronic devices with display functions have become indispensable devices for people to go out and live, and with the continuous development of display technologies, the requirements for the display effect of the display panel in the electronic devices with display functions are higher and higher.
The display panel generally includes a plurality of pixels, and the display panel presents a corresponding image by providing corresponding data signals to the pixels to control the pixels to present corresponding display luminance. However, due to the influence of the hysteresis effect of the devices in the pixels, when the display brightness of the pixels is switched from one display brightness to another display brightness, the display brightness of the first frame is different from the display brightness that the first frame should present, so that the display effect of the display panel is influenced.
Disclosure of Invention
The invention provides a control method and device of a display panel, a display device and a storage medium, which aim to solve the problem that when the picture is switched in the prior art, the display brightness of a switched first frame picture is different from the display brightness to be presented, so that the display effect of the display panel is influenced.
According to an aspect of the present invention, there is provided a control method of a display panel including a plurality of pixels arranged in an array, the control method including:
acquiring a first mapping relation between the display brightness and the gray scale of the pixel in a first frame picture and a second mapping relation between the display brightness and the gray scale of the pixel in a second frame picture when the gray scale of 0 is switched to other gray scales;
if the data signal of the pixel in the current display picture is a data signal corresponding to the 0 gray scale, acquiring the display gray scale of the pixel in the next display picture;
determining target display brightness corresponding to the display gray scale of the pixel according to the second mapping relation;
determining a target gray scale of the pixel according to the first mapping relation and the target display brightness;
and when the first frame of the next display picture is displayed, providing a data signal corresponding to the target gray scale for the pixel.
According to another aspect of the present invention, there is provided a control apparatus of a display panel including a plurality of pixels arranged in an array, the control apparatus of the display panel including:
the mapping relation acquisition module is used for acquiring a first mapping relation between the display brightness and the gray scale of the pixel in a first frame picture and a second mapping relation between the display brightness and the gray scale of the pixel in a second frame picture when the gray scale of 0 is switched to other gray scales;
the display gray scale acquisition module is used for acquiring the display gray scale of the pixel in the next display picture if the data signal of the pixel in the current display picture is a data signal corresponding to the 0 gray scale;
the target brightness determining module is used for determining target display brightness corresponding to the display gray scale of the pixel according to the second mapping relation;
the target gray scale determining module is used for determining the target gray scale of the pixel according to the first mapping relation and the target display brightness;
and the display driving module is used for providing a data signal corresponding to the target gray scale for the pixel when the first frame picture of the next display picture is displayed.
According to another aspect of the present invention, there is provided a display apparatus including: a display panel and a driving chip;
the driving chip is used for executing the control method of the display panel when the display panel is driven to display the picture.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement the above-described control method of a display panel when executed.
According to the technical scheme, when the display frame is switched, the display gray scale of the pixel in the next display frame is obtained, the target display brightness corresponding to the display gray scale of the pixel is determined according to the second mapping relation between the display brightness and the gray scale of the pixel in the second frame of the display frame, the target display brightness is mapped into the first mapping relation, and the target gray scale corresponding to the target display brightness is determined, so that when the first frame of the display frame to be switched is displayed, the data signal corresponding to the target gray scale is provided for the pixel, the display brightness displayed by the pixel in the first frame of the display frame can be kept consistent with the target display brightness, the display accuracy of the first frame of the display frame can be improved, the display uniformity of the display panel is improved, and the display effect of the display panel is improved.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel of the related art;
FIG. 2 is a schematic diagram of a display unit according to the related art;
FIG. 3 is a graph comparing the display brightness of a first frame and the display brightness of a second frame in the prior art;
FIG. 4 is a flowchart illustrating a method for controlling a display panel according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a first mapping relationship and a second mapping relationship provided in an embodiment of the present invention;
fig. 6 is a flowchart of a method for obtaining a first mapping relationship and a second mapping relationship according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the display brightness of each frame of image at a certain test gray level according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a control method for a display panel according to another embodiment of the present invention;
FIG. 9 is a flowchart of a target gray level determination method according to an embodiment of the present invention;
FIG. 10 is a diagram illustrating the display brightness of each frame of image at different test gray levels according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a control device of a display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a display panel in related art, and as shown in fig. 1, a display panel 100 includes a display area 110 and a non-display area 120 surrounding the display area 110, the display area 110 includes a plurality of pixels 10 arranged in an array, a plurality of scanning signal lines 20 and a plurality of data signal lines 30, at least some of the pixels 10 located in a same row are electrically connected to a same scanning signal line 20, and at least some of the pixels 10 located in a same column are electrically connected to a same data signal line 30; the non-display area 120 includes a scan driving circuit 40, and the scan driving circuit 40 can sequentially supply an enable level of a scan signal to each scan signal line 20; the non-display area 120 further includes a driving chip setting area 50, the driving chip setting area 50 is used for setting a driving chip, the driving chip can provide a data signal to each data signal line 30, so that when the scan signal line 20 and the data signal line 30 electrically connected to the same pixel 10 transmit an enable level of the scan signal and the data signal, respectively, the data signal can be written into the pixel 10, so that the pixel 10 can display and emit light according to the data signal, and the display panel presents a corresponding picture, and when the picture presented by the display panel is different, the data signal provided to each pixel is different.
The pixel may include a pixel circuit and a light-emitting element, and the pixel circuit may drive the light-emitting element to emit light for display. As shown in fig. 2, the pixel circuit 11 of the pixel 10 includes an initialization transistor M1, a data writing transistor M2, a threshold compensation transistor M3, a first light emitting control transistor M4, a second light emitting control transistor M5, a reset transistor M6, a driving transistor T, and a storage capacitor Cst, that is, the pixel circuit 11 is a typical 7T1C circuit, and the working process thereof is similar to that of the existing document and is not repeated herein.
When the display panel switches the image, the data signals of at least some pixels need to be switched, which is influenced by the characteristics of the devices in the pixels, for example, the hysteresis effect of the driving transistors in the pixels, so that the image displayed by the display panel has smear, which is especially obvious when the display panel switches from a black image to another image, and the reason for this is mainly caused by the low display brightness of the first frame image when the black image is switched to another image (as shown in fig. 3).
In the prior art, before the display panel leaves a factory, when the display screen of the display panel is switched from a black screen to another screen, for example, when the black screen is switched to a white screen, the brightness percentage of the display brightness of a first frame screen of the white screen to the display brightness of a second frame screen is tested, so that when the brightness percentage is low, the compensation gray scale of each pixel is increased by a preset adjustment amount, and when the brightness percentage is high, the compensation gray scale of each pixel is decreased by the preset adjustment amount until the brightness percentage is within a preset range, and the compensation gray scale when the brightness percentage is within the preset range is stored in a memory of a driving chip, so that in the use process of a subsequent display panel, the display brightness of the first frame screen when the screen is switched is compensated according to the compensation gray scale.
However, in the prior art, the acquisition of the compensation gray scale needs to be repeatedly tested, the testing process is complex, and the testing efficiency is low; meanwhile, due to the fact that the preparation process, the materials, the aging degree and the like are different, the hysteresis conditions of devices of pixels in different display panels are different, and the pixels of different display panels need different compensation gray scales, so that the compensation gray scales of the pixels in the display panels are determined by testing the display panels one by one, and the requirement for mass production of the display panels cannot be met.
In order to solve the above technical problem, an embodiment of the present invention provides a control method for a display panel, where the control method is used to control the display brightness of a displayed picture of the display panel, and the control method for the display panel can be executed by a control device for the display panel provided in the embodiment of the present invention, the control device for the display panel can be implemented in a form of hardware and/or software, and the control device for the display panel can be integrated into a driving chip of a display device. Fig. 4 is a flowchart of a control method of a display panel according to an embodiment of the present invention, and as shown in fig. 4, the control method of the display panel includes:
s110, when the gray scale of 0 is switched to other gray scales, a first mapping relation between the display brightness of the pixels in the first frame picture and the gray scales and a second mapping relation between the display brightness of the pixels in the second frame picture and the gray scales are obtained.
The display brightness level of each pixel in the display panel may be divided into 0-255 gray scales, where different gray scales correspond to different data signals, for example, when the data signal corresponding to the 0 gray scale is provided to the pixel of the display panel, the display brightness of the pixel is the lowest, and when the data signal corresponding to the 255 gray scale is provided to the pixel of the display panel, the display brightness of the pixel is the highest; when the display brightness of the pixel is switched from the 0 gray scale to another gray scale, for example, the 255 gray scale, for example, the data signal corresponding to the 0 gray scale written in the pixel needs to be changed into the data signal corresponding to the 255 gray scale, so that the display brightness of the pixel can be changed, and the image displayed by the display panel is changed.
Specifically, when the display panel performs the image display, the image displayed by the display panel is refreshed at a certain refresh frequency, that is, the data signal is provided to the same pixel at a certain period, and after the data signal is written once, the pixel performs the display according to the data signal, generally, the image displayed by the display panel is one frame image from the time when the data signal is provided to each pixel in the display panel to the time when the data signal is provided to each pixel in the display panel next time, the data signal provided to each pixel in the display panel is refreshed at the certain refresh frequency, so that the display panel can continuously perform the image display for a period of time, and the data signal, that is, the multi-frame image, is provided to each pixel in the display panel for a plurality of times during the period when the display panel normally displays one image. Because the display brightness corresponding to the 0 gray scale is lower, when the 0 gray scale is switched to other gray scales, the display brightness of the first frame of picture of the switched gray scale is lower due to the hysteresis effect of the devices in the pixels, and the display brightness of the second frame of picture is more close to the target display brightness; at this time, when the data signal corresponding to each pixel is switched from the data signal corresponding to the 0 gray scale to the data signal corresponding to each gray scale in the 0-255 gray scales, the display brightness of each pixel in the first frame of picture and the display brightness of each pixel in the second frame of picture in the 0-255 gray scales are obtained, and the first mapping relationship Ln = F (n) is determined according to the relationship between the display brightness and the gray scale of each pixel in the first frame of picture in the 0-255 gray scales.
For example, as shown in fig. 5, the first mapping relationship and the second mapping relationship can be represented by a relationship curve, that is, the first mapping relationship is a first frame of each gray scaleThe second mapping relation is a relation curve B of the display brightness and the gray scale of the pixel under the second frame picture of each gray scale; both the relation curve a and the relation curve B may be gamma 2.2-like curves, and in this case, the relation of the first mapping relation may be Ln = L255' (n/255) 2.2 The relation of the second mapping relation may be Ln = L255 (n/255) 2.2 L255 and L255' are respectively the display brightness of the pixel in the first frame picture and the display brightness of the pixel in the second frame picture at the 255 gray level.
And S120, if the data signal of the pixel in the current display picture is the data signal corresponding to the 0 gray scale, acquiring the display gray scale of the pixel in the next display picture.
Specifically, when the display panel displays an image, the display brightness of each pixel in the display panel is the same or different, so that the display panel can present a colorful image. The display brightness of the pixel in the current display picture is the lowest display brightness, the data signal written into the pixel is the data signal corresponding to the gray scale of 0, the display brightness of the pixel in the next display picture can be changed according to the brightness and the color of the display picture required to be presented by the display panel, namely, the gray scale of the pixel in the next display picture can be changed according to the display picture to be presented by the display panel, and the display gray scale of the pixel in the next display picture can be obtained at the moment.
And S130, determining target display brightness corresponding to the display gray scale of the pixel according to the second mapping relation.
Specifically, after the display gray scale of the pixel is known, for example, the display gray scale of the pixel is i, the display gray scale i of the pixel may be substituted into the second mapping relationship Ln = G (n), and the unique display luminance Li = G (i) may be determined, where Li is the target display luminance corresponding to the display gray scale of the pixel, for example, li = L255 (i/255) 2.2 。
For example, with continued reference to fig. 5, when the display gray scale of the pixel is 128, the relationship curve B can determine that the display luminance L128= L255 (128/255) corresponding to the 128 gray scale 2.2 The display brightness L128 is greater than the corresponding relation curve A or the corresponding relationThe display luminance L128'= L255' = (128/255) corresponding to 128 determined by the system formula 2.2 。
S140, determining the target gray scale of the pixel according to the first mapping relation and the target display brightness.
Specifically, after the target display luminance Li corresponding to the display gray scale of the pixel is obtained, the target display luminance Li may be substituted into the first mapping relation Ln = F (n), that is, li = F (i + Δ n), and a unique gray scale value i + Δ n may be determined, so that when the first frame of the next display frame is displayed, the gray scale to be compensated by the pixel is determined to be Δ n, and the sum of the gray scale to be compensated by the pixel Δ n and the display gray scale of the pixel is taken as the target gray scale of the pixel. For example, by making L128= L255' [ (128 + Δ n)/255 ″] 2.2 Namely L255 x (128/255) 2.2 ＝L255′*[(128+Δn)/255] 2 . 2 Can solve for Δ n =255 × e ln(RT*(128/255)2 . 2/2 . 2 -128, wherein RT is L255/L255'.
For example, with reference to fig. 5, when the target display luminance L128 corresponding to the 128 gray scale is determined by the relation curve B, the target display luminance L128 is closer to the display luminance L (128 + Δ n)' corresponding to the 128+ Δ n gray scale in the relation curve a, so that the 128+ Δ n gray scale can be used as the target gray scale of the pixel with the display gray scale of 128.
S150, when the first frame of the next display picture is displayed, a data signal corresponding to the target gray scale is provided for the pixel.
Specifically, in order to ensure that the display brightness of the pixel in the first frame of the next display frame is consistent with the target display brightness, the data signal corresponding to the determined target gray scale may be provided to the pixel, so that the display brightness of the pixel, which is presented according to the data signal corresponding to the target gray scale, may be consistent with the target display brightness when the first frame of the next display frame is displayed.
For example, with reference to fig. 5, when the data signal corresponding to the gray level 160 is provided to the pixel in the first frame, the display brightness L160' of the pixel is consistent with the target display brightness L128 corresponding to the gray level 128 of the pixel, accordingly, when the first frame of the next display frame is displayed, the data signal corresponding to the gray level 160 can be provided to the pixel, so that the display brightness of the pixel can be consistent with the target display brightness corresponding to the gray level of the pixel.
In the embodiment, when the display frame is switched, the display gray scale of the pixel in the next display frame is obtained, the target display brightness corresponding to the display gray scale of the pixel is determined according to the second mapping relation between the display brightness and the gray scale of the pixel under the second frame, the target display brightness is mapped into the first mapping relation, and the target gray scale corresponding to the target display brightness is determined, so that when the first frame of the display frame to be switched is displayed, the data signal corresponding to the target gray scale is provided for the pixel, and the display brightness presented by the pixel in the first frame of the display frame can be kept consistent with the target display brightness, so that the display accuracy of the first frame of the display frame can be improved, the display uniformity of the display panel can be improved, and the display effect of the display panel can be improved.
In an optional embodiment, when the display frames are switched, if the data signal of the pixel needs to be switched from the data signal corresponding to the 0 gray scale to the data signal corresponding to the other gray scale, the data signal corresponding to the other gray scale is written based on the data signal corresponding to the 0 gray scale, and at this time, due to a hysteresis effect of devices in the pixel, the data signal corresponding to the other gray scale is not written enough, so that the display brightness of the pixel in the first frame is different from the target display brightness that the pixel should present. When the data signal of other frame pictures after the first frame picture is written into the pixel, for example, when the data signal of the second frame picture is written into the pixel, the data signal of the second frame picture is written into the pixel on the basis of the data signal of the first frame picture, so that the data signal is easier to write into the pixel, sufficient data signals can be written into the pixel, and the display brightness of the pixel in the second frame picture is ensured to be consistent with the target display brightness which the pixel should present. Therefore, when other frame pictures of the next display picture are displayed, the data signals corresponding to the display gray scales are provided for the pixels, so that when the pixels display according to the data signals corresponding to the display gray scales, the display brightness of the pixels can be ensured to be consistent with the target display brightness corresponding to the display gray scales, the display uniformity of the display panel can be improved, and the display effect of the display panel is further improved.
It can be understood that the first mapping relationship and the second mapping relationship can be obtained by actually displaying the brightness of the pixel under each test gray scale, the test process can be performed when the display panel is turned on or is switched from a sleep state to an awake state, and at this time, the display panel can be provided with a corresponding light sensing element to detect the brightness of the pixel.
In an optional embodiment, fig. 6 is a flowchart of a method for obtaining a first mapping relationship and a second mapping relationship according to an embodiment of the present invention, and as shown in fig. 6, the method includes:
and S111, when the data signal of the pixel is the test signal corresponding to the 0 gray scale, acquiring the current test gray scale of the pixel.
Specifically, before the display panel is actually displayed, a test signal is supplied to each pixel in the display panel, and the pixel is caused to emit display light in accordance with the test signal. The test signals provided to the pixels correspond to the test gray machines one by one, the value range of the test gray scale can be the same as or different from the value range of the display gray scale when the display panel formally displays the picture, and the value range of the corresponding test signals can also be the same as or different from the value range of the data signals provided to the pixels when the display panel formally displays the picture. For example, the value range of the test gray scale may be the same as the value range of the display gray scale when the display panel formally performs picture display, for example, the display gray scale and the test gray scale may both vary from 0 to 255, and the value range of the test signal may be greater than the value range of the data signal, so that for the case that the display gray scale other than 0 is the same as the test gray scale, the display luminance of the pixel performing display lighting according to the test signal corresponding to the test gray scale may be greater than the display luminance of the pixel performing display lighting according to the data signal, so as to facilitate compensation for the display gray scale of the pixel when displaying the first frame picture in subsequent formal display. Before testing the display brightness of the pixel under each test gray scale, the test signal in the pixel needs to be adjusted to the test signal corresponding to the 0 gray scale, so that the test signal can be switched from the 0 gray scale to other test gray scales.
S112, judging whether the current test gray scale is larger than a preset test gray scale or not; if not, executing S113; if yes, S117 is performed.
Specifically, when the display brightness of the pixel under each test gray scale is tested, the 0 gray scale may be used as an initial test gray scale, and the test gray scale is adjusted by a certain gray scale adjustment amount until the test gray scale reaches a preset test gray scale, which may be the highest test gray scale, for example, the highest test gray scale is 255, and the preset gray scale adjustment amount is 1, when the highest test gray scale is 255, the current test gray scale is continuously adjusted by the preset gray scale adjustment amount, and then the current test gray scale is changed to 256, and then the 256 gray scale is greater than the preset test gray scale. Therefore, whether the test process is finished or not can be determined by judging whether the test gray scale is the preset test gray scale or not.
And S113, providing a test signal corresponding to the current test gray scale to the pixel so that the pixel displays and emits light according to the test signal.
S114, acquiring first actual display brightness of pixels in the previous m frames of pictures and second actual display brightness of pixels in other continuous m frames of pictures except the first frame of pictures.
Specifically, the display panel can continuously perform image display by providing a test signal corresponding to a current test gray scale to the pixel at a certain refreshing frequency, and providing the test signal corresponding to the current test gray scale to the pixel from the first time to the mth time, and the display panel continuously detects the display brightness of the pixel when performing image display, namely the integral of the display brightness of the pixel during the period from the beginning of a first frame image to the end of the mth frame image, and takes the display brightness integral as a first actual display brightness; meanwhile, the integral of the display brightness of the pixels in the continuous m frames of pictures except the first frame of picture is used as the second actual brightness, the continuous m frames of pictures except the first frame of picture can be frames from the (m + 1) th frame of picture to the (m + m) th frame of picture, at this time, the test signal corresponding to the current test gray scale is provided for the pixels from the (m + 1) th time to the (m + m) th time, the display panel can also continuously perform picture display, and the display brightness of the pixels is continuously detected when the display panel performs picture display, namely the integral of the display brightness of the pixels in the period from the beginning of the (m + 1) th frame of picture to the end of the (m + m) th frame of picture, so that the display brightness integral is used as the second actual display brightness. Since the display time for one frame of picture is short and the accuracy of the detected display brightness may be affected by the interference of the external ambient light, m may be a positive integer greater than or equal to 2.
Specifically, as shown in fig. 7, for example, taking m equal to 2 as an example, under the current test gray scale, the total duration of the first frame image and the second frame image is t1+ t2, and by continuously detecting the display brightness of the pixel within the time period of t1+ t2, the first actual display brightness L1 of the pixel under the current test gray scale can be determined; the total duration of the third frame image and the fourth frame image is t3+ t4, and the second actual display brightness L2 of the pixel under the current test gray scale can be determined by continuously detecting the display brightness of the pixel in the time period of t3+ t 4.
S115, according to the first actual display brightness and the second actual display brightness, the display brightness of the pixels in the first frame image when the 0 gray scale is switched to the current test gray scale is determined, and according to the second actual display brightness, the display brightness of the pixels in the second frame image after the 0 gray scale is switched to the current test gray scale is determined.
Specifically, since the first actual display brightness is the sum of the display brightness of the pixel in the first frame picture and the display brightness of the pixel in the other m-1 frame pictures, and the second actual display brightness is the sum of the display brightness of the pixel in the other continuous m frame pictures except the first frame picture, and the display brightness of the pixel in the first frame picture is lower, and the display brightness of the pixel in the other frame pictures is close to the target display brightness corresponding to the current test gray scale, the display brightness of the pixel in the first frame picture can be determined from the sum of the display brightness of the pixel in the first frame picture and the display brightness of the pixel in the other m-1 frame pictures and the sum of the display brightness of the pixel in the other continuous m frame pictures except the first frame picture.
In an alternative embodiment, the manner of determining the display brightness of the pixel in the first frame picture is to perform a calculation according to the first actual display brightness and the second actual display brightness by using a first calculation formula, where the first calculation formula is La = (m × L1- (m-1) × L2)/m. Since the display brightness of the pixels in each of the other frames except the first frame is consistent with the target display brightness, the display brightness of each of the other frames except the first frame can be regarded as the display brightness of the second frame, m × L1 can be regarded as the total display brightness of the pixels in m first frames and the total display brightness of the pixels in m (m-1) second frames, and (m-1) × L2 can be regarded as the total display brightness of the pixels in m (m-1) second frames, so that the display brightness La of the pixels in one first frame can be determined by using the first calculation formula.
Likewise, since the second actual display luminance L2 can be regarded as the total display luminance of the pixel in the m second frame pictures, 1/m times of the second actual display luminance L2 can be determined as the display luminance of the pixel in the second frame picture, that is, the display luminance Lb of the pixel in the second frame picture is L2/m.
And S116, after the current test gray scale is adjusted by the preset gray scale adjustment quantity, providing a test signal corresponding to the 0 gray scale for the pixel, and returning to execute S112.
Specifically, after determining the display brightness La in the first frame picture and the display brightness Lb in the second frame picture of the pixel at the current test gray scale, the current test gray scale may be adjusted by a preset gray scale adjustment amount, for example, after determining the display brightness L321 in the first frame picture and the display brightness L322 in the second frame picture of the pixel at 32 gray scales, the test signal in the pixel is adjusted to a test signal corresponding to the 0 gray scale again, and meanwhile, the current test gray scale is increased by a preset gray scale adjustment amount Δ P, that is, the current test gray scale is changed to 32+ Δ P; when the test signal in the pixel is a test signal corresponding to a 0 gray scale, providing a test signal corresponding to a 32+ delta P gray scale for the pixel, acquiring first actual display brightness and second actual display brightness of the pixel under the 32+ delta P gray scale, determining the display brightness of the pixel in a first frame picture and the display brightness of the pixel in a second frame picture under the 32+ delta P gray scale based on the first actual brightness and the second actual brightness, and completing the test of the display brightness of the pixel in the first frame picture and the display brightness of the pixel in the second frame picture when the pixel is switched from the 0 gray scale to other gray scales when the display brightness of the pixel in the first frame picture and the display brightness of the pixel in the second frame picture under the maximum test gray scale are acquired.
S117, determining the first mapping relation according to the relation between the display brightness of the pixel in each first frame picture and each test gray scale, and determining the second mapping relation according to the relation between the display brightness of the pixel in each second frame picture and each test gray scale.
Specifically, after the test of the display brightness of the first frame picture and the display brightness of the second frame picture of the pixel under each test gray scale is completed, the corresponding relationship curve or relationship formula can be determined as the first mapping relationship according to the relationship between the display brightness of the first frame picture and the test gray scale of the pixel under each test gray scale, and the corresponding relationship curve or relationship formula can be determined as the second mapping relationship according to the relationship between the display brightness of the second frame picture and the test gray scale of the pixel under each test gray scale.
According to the embodiment of the invention, the first actual display brightness and the second actual display brightness of the pixel under each test gray scale are tested to determine the display brightness of the first frame picture and the display brightness of the second frame picture of the pixel under each test gray scale, and the first mapping relation and the second mapping relation are determined according to the actually measured display brightness of the first frame picture and the actually measured display brightness of the second frame picture, so that the correspondence between the display brightness of the pixel and the gray scale in the actual working process of the display panel is kept consistent according to the first mapping relation and the second mapping relation, and after the target gray scale is determined by adopting the first mapping relation and the second mapping relation, the display brightness of the pixel according to the data signal corresponding to the target gray scale can be kept consistent with the target display brightness, and the display effect of the display panel is further improved.
It can be understood that, when the first mapping relationship and the second mapping relationship are obtained, the value range of the test signal corresponding to each test gray scale is larger than the value range of the data signal corresponding to each display gray scale, that is, when the display gray scales are the same as the test gray scales, the display luminance of the pixel according to the data signal corresponding to the display gray scales is lower than the display luminance of the pixel according to the test signal corresponding to the test gray scales, so that when the target display luminance is determined, the display gray scales are correspondingly reduced, the corresponding compensation gray scale is determined, and the target gray scale corresponding to the display gray scale is further determined.
Optionally, fig. 8 is a flowchart of a control method for a display panel according to another embodiment of the present invention, and as shown in fig. 8, the method includes:
s210, when the gray scale of 0 is switched to other gray scales, a first mapping relation between the display brightness of the pixels in the first frame picture and the gray scales and a second mapping relation between the display brightness of the pixels in the second frame picture and the gray scales are obtained.
S220, if the data signal of the pixel in the current display picture is the data signal corresponding to the 0 gray scale, the display gray scale of the pixel in the next display picture is obtained.
S230, obtaining the scaling coefficient of the display gray scale.
Specifically, taking the example that the higher the voltage of the data signal is, the larger the corresponding gray scale is, in order to ensure that each display gray scale can have the corresponding target display brightness during formal display, when the gray scale of 0 is switched to a certain test gray scale, the display brightness of the pixel in the first frame picture and the second frame picture is tested, the data signal corresponding to the test gray scale is amplified in a certain proportion and then used as the test signal, when the data signal is the test signal, according to the corresponding relation between the data signal and the gray scale, an amplified gray scale can be determined, and the proportion between the amplified gray scale and the test gray scale is determined as the scaling proportion of the display gray scale. Illustratively, the data signal corresponding to the test gray scale 50 is 3.5V, the data signal is increased by 3.5 times to 5.25V, it can be known that the test signal corresponding to the test gray scale 50 is 5.25V, and then the gray scale corresponding to the data signal of 5.25V is determined according to the corresponding relationship between the data signal and the gray scale, for example, the gray scale corresponding to the data signal of 5.25V is 100 gray scale, and the ratio of 50 to 100 is determined as the scaling factor of the display gray scale. Conversely, when the higher the voltage of the data signal is, the smaller the corresponding gray scale is, the data signal corresponding to the test gray scale may be scaled down by a certain ratio to be used as the test signal, and the scaling factor of the display gray scale may be determined in a manner similar to that described above. In other words, to ensure the formal display, taking the values of the display gray scale and the test gray scale as 0-255 as an example, each display gray scale can have corresponding target display brightness, and 0-224 gray scales in the relationship curve of the second mapping relationship between the display brightness of the determined pixel in the second frame picture and the test gray scale are re-divided into 256 gray scales of 0-255 as display gray scales.
S240, determining a mapping gray scale corresponding to the display gray scale according to the scaling coefficient.
And S250, determining the target display brightness corresponding to the display gray scale according to the mapping gray scale and the second mapping relation.
Specifically, after the scaling coefficient of the display gray scale is determined, the display gray scale may be multiplied by the scaling coefficient to determine a mapping gray scale corresponding to the display gray scale, and the display brightness corresponding to the mapping gray scale in the second mapping relationship is determined as the target display brightness corresponding to the display gray scale. For example, continuing to take the display gray scale as 100 and the scaling factor as 0.5 as an example, the mapping gray scale corresponding to the display gray scale 100 may be determined as 50, the mapping gray scale may be substituted into the second mapping relationship Ln = Gn to determine that the display luminance corresponding to the mapping gray scale is L50= G (50), and the display luminance L50 may be used as the target display luminance corresponding to the display gray scale 100, so that when the target gray scale of a pixel is determined according to the first mapping relationship and the target display luminance, L50= F (50 + Δ n) may be set, and the target gray scale when the first frame of the next display frame is displayed as the pixel after the 50+ Δ n is increased by a certain ratio may be used as the target gray scale of the pixel, that is, (50 + Δ n)/0.5 may be used as the target gray scale of the pixel. Thus, even if the display gray scale is 255 with the maximum display gray scale, the corresponding target gray scale or compensation gray scale can be found.
And S260, determining the target gray scale of the pixel according to the first mapping relation and the target display brightness.
S270, when the first frame of the next display frame is displayed, a data signal corresponding to the target gray scale is provided for the pixel.
In the embodiment, after the display gray scales are reduced in an equal proportion by a certain scaling coefficient, the target display brightness corresponding to the reduced display gray scales under the second mapping relationship is determined, so that the compensation gray scales are determined according to the target display brightness and the second mapping relationship, and the compensation gray scales can be within the gray scale range of the second mapping relationship obtained through testing, so that each display gray scale is ensured to have the corresponding compensation gray scale, namely each display gray scale has the corresponding target gray scale, and the display effect of the display panel is further improved.
It can be understood that, when the value range of the test gray scale is greater than the value range of the display gray scale, and the test gray scale is the same as the display gray scale, the test signal corresponding to the test gray scale may also be equal to the data signal corresponding to the display gray scale, and at this time, the compensation requirement of the first frame picture of different display gray scales may be satisfied without scaling the display gray scale.
Optionally, on the basis of the foregoing embodiment, an embodiment of the present invention further provides a specific determination manner of a target gray scale, and fig. 9 is a flowchart of a target gray scale determination method provided by an embodiment of the present invention, as shown in fig. 9, the method includes:
and S141, determining a gray scale calculation value of the target display brightness under the first mapping relation.
Specifically, the first mapping relationship is the gamma2.2 relationship between the gray scale and the display brightness, i.e. the first mapping relationship is Ln = L255' (n/255) 2.2 When the target display brightness corresponding to the display gray scale is Li, the target display brightness is substituted into the first mapping relation to determine that a gray scale calculation value s is 255 × e (ln(Li/L255′)/2 . 2) 。
S142, judging that the target display brightness meets a first preset condition according to the target display brightness, the gray scale calculation value and the first mapping relation; if so, go to S143, otherwise go to S144 or S145.
The first preset condition is that the target display brightness is less than or equal to Lj +1', and the target display brightness is greater than or equal to Lj'; j is an integer value of the gray scale calculation value, and Lj +1' is the display brightness corresponding to the gray scale of j +1 under the first mapping relation; lj' is the display brightness corresponding to the j gray scale in the first mapping relation.
S143, determining the integer value of the gray scale calculation value as the target gray scale of the pixel.
S144, if the target display brightness is larger than Lj +1', determining j +1 as the integer value of the gray scale calculation value, and returning to execute S142.
S145, if the target display brightness is smaller than Lj', determining j-1 as the integer value of the gray scale calculation value, and returning to execute S142.
Specifically, the gray-scale calculation value s calculated by substituting the target display brightness into the first mapping relationship may be a non-integer value, and at this time, the gray-scale calculation value s may be rounded to determine an integer value j of the gray-scale calculation value s. After the integer value j of the gray scale calculation value is determined, the integer value j of the gray scale calculation value can be substituted into the first mapping relation, the display brightness Lj 'corresponding to the integer value j of the gray scale calculation value is determined, and the integer value j of the gray scale calculation value is added with 1 and substituted into the first mapping relation, so that the display brightness Lj +1' corresponding to j +1 is determined. And determining that the target display brightness meets a first preset condition by comparing the corresponding relation between Lj 'and Lj +1' and the target display brightness. When the target display brightness meets a first preset condition, directly determining the j gray scale as the target gray scale of the pixel; when the target display brightness does not meet the first preset condition, the rounding value of the gray scale calculation value can be readjusted according to the actual situation, for example, when the display brightness Lj 'corresponding to j is greater than the target display brightness Li, j-1 can be determined as the rounding value of the gray scale calculation value, the display brightness Lj-1' corresponding to j-1 is determined by substituting j-1 into the first mapping relation, whether Lj-1 'is less than or equal to Li is judged at the same time, and when Lj-1' is less than or equal to Li, the j-1 gray scale is determined as the target gray scale of the pixel; similarly, when the display luminance Lj +1 'corresponding to j +1 is smaller than the target display luminance Li, j +1 may be determined as an integer of the calculated gray scale value, and the display luminance Lj +2' corresponding to j +2 may be determined by substituting j +2 into the first mapping relationship, and at the same time, whether Lj +2 'is greater than or equal to Li is determined, and when Lj +2' is greater than or equal to Li, the gray scale j +1 may be determined as the target gray scale of the pixel.
For example, as shown in fig. 10, taking the display luminance Li of the pixel in the second frame picture when the target display luminance is the ith gray scale as an example, it can be known that the target display luminance Li is greater than or equal to the display luminance Lj 'of the pixel in the first frame picture when the target display luminance is the j gray scale and is less than or equal to the display luminance Lj +1' of the pixel in the first frame picture when the target display luminance is the j +1 gray scale, and accordingly, j can be determined as the target gray scale corresponding to the display gray scale i of the pixel.
In this embodiment, after the gray scale calculation value corresponding to the target display brightness in the first mapping relationship is determined based on the target display brightness, the target display brightness is compared with the display brightness of the rounded value of the determined gray scale calculation value in the first mapping relationship and the display brightness of the gray scale value greater than the rounded value of the gray scale calculation value by 1 gray scale in the first mapping relationship, and the target gray scale corresponding to the target display brightness of the pixel is determined according to the comparison result, so that the determined target gray scale can be more accurate, and the display uniformity of the display panel is further improved.
Based on the same inventive concept, embodiments of the present invention further provide a control apparatus for a display panel, where the control apparatus for the display panel can be used to control the display brightness of a displayed image of the display panel, the control apparatus for the display panel is implemented in a form of hardware and/or software, and the control apparatus for the display panel can be integrated in a driving chip of a display device. Fig. 11 is a schematic structural diagram of a control device of a display panel according to an embodiment of the present invention, and as shown in fig. 11, the control device of the display panel includes:
a mapping relation obtaining module 510, configured to obtain a first mapping relation between the display brightness and the gray scale of a pixel in a first frame of picture and a second mapping relation between the display brightness and the gray scale of a pixel in a second frame of picture when the gray scale of 0 is switched to another gray scale;
a display gray scale obtaining module 520, configured to obtain a display gray scale of a pixel in a next display frame if the data signal of the pixel in the current display frame is a data signal corresponding to a gray scale of 0;
a target brightness determining module 530, configured to determine, according to the second mapping relationship, a target display brightness corresponding to the display gray scale of the pixel;
a target gray scale determining module 540, configured to determine a target gray scale of the pixel according to the first mapping relationship and the target display brightness;
the display driving module 550 is configured to provide a data signal corresponding to the target gray scale to the pixel when displaying the first frame of the next display frame.
The control device for a display panel provided in the embodiment of the present invention is capable of executing the control method for a display panel provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.
Based on the same inventive concept, an embodiment of the present invention further provides a display apparatus, where the display apparatus includes a display panel and a driving chip, and the driving chip may include the control device for the display panel provided in the embodiment of the present invention and may execute the control method for the display panel provided in the embodiment of the present invention.
Fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 12, the display device 200 includes, but is not limited to, a television, a notebook computer, a desktop display, a tablet computer, a digital camera, a smart band, smart glasses, a vehicle-mounted display, a medical device, an industrial control device, a touch interaction terminal, and the like.
Based on the same inventive concept, embodiments of the present invention also provide a computer storage medium, and in some embodiments, the control method of the display panel provided by embodiments of the present invention may be implemented as a computer program, which is tangibly embodied in a computer-readable storage medium, such as a memory or the like. In some embodiments, part or all of the computer program may be loaded and/or installed on the display device via ROM. When the computer program is loaded into the RAM of the display device and executed by the processor of the display apparatus, one or more steps of the control method of the display panel described above may be performed. Alternatively, in other embodiments, the processor of the display device may be configured by any other suitable means (e.g., by means of firmware) to perform the control method of the display panel.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a computer-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A control method of a display panel, wherein the display panel comprises a plurality of pixels arranged in an array, the control method of the display panel comprises:
acquiring a first mapping relation between the display brightness and the gray scale of the pixel in a first frame picture and a second mapping relation between the display brightness and the gray scale of the pixel in a second frame picture when the gray scale of 0 is switched to other gray scales;
if the data signal of the pixel in the current display picture is a data signal corresponding to the 0 gray scale, acquiring the display gray scale of the pixel in the next display picture;
determining target display brightness corresponding to the display gray scale of the pixel according to the second mapping relation;
determining a target gray scale of the pixel according to the first mapping relation and the target display brightness;
and when the first frame of the next display picture is displayed, providing a data signal corresponding to the target gray scale for the pixel.
2. The method as claimed in claim 1, wherein obtaining the first mapping relationship between the display brightness and the gray scale of the pixel in the first frame when switching from the 0 gray scale to the other gray scale comprises:
when the data signal of the pixel is a test signal corresponding to the 0 gray scale, acquiring the current test gray scale of the pixel;
judging whether the current test gray scale is larger than a preset test gray scale or not;
if not, providing a test signal corresponding to the current test gray scale to the pixel so that the pixel performs display luminescence according to the test signal;
acquiring first actual display brightness of the pixels in the previous m frames of pictures and second actual display brightness of the pixels in other continuous m frames of pictures except the first frame of pictures; wherein m is a positive integer greater than or equal to 2;
determining the display brightness of the pixel in a first frame of picture when the current test gray scale is switched from the 0 gray scale according to the first actual display brightness and the second actual display brightness;
after the current test gray scale is adjusted by a preset gray scale adjustment quantity, providing a test signal corresponding to the 0 gray scale for the pixel, and returning to the step of judging whether the current test gray scale is the preset test gray scale or not;
and if so, determining the first mapping relation according to the relation between the display brightness of the pixel in each first frame picture and each test gray scale.
3. The method as claimed in claim 2, wherein determining the display brightness of the pixel in the first frame when switching from the 0 gray level to the current test gray level according to the first actual display brightness and the second actual display brightness comprises:
determining the display brightness of the pixel in a first frame picture when the current test gray scale is switched from the 0 gray scale by adopting a first calculation formula according to the first actual display brightness and the second actual display brightness; the first calculation formula is:
La＝(m*L1-(m-1)*L2)/m
and La is the actual display brightness of the first frame picture when the gray scale of 0 is switched to the current test gray scale, L1 is the first actual display brightness, and L2 is the second actual display brightness.
4. The method as claimed in claim 2, wherein obtaining a second mapping relationship between the display brightness and the gray scale of the pixel in the second frame when switching from the 0 gray scale to the other gray scale comprises:
after second actual display brightness of the pixels in the continuous m frames except the first frame is obtained, the display brightness of the pixels in a second frame is determined after the 0 gray scale is switched to the current test gray scale according to the second actual display brightness;
and if the current test gray scale is the preset test gray scale, determining the second mapping relation according to the relation between the display brightness of the pixel in each second frame picture and each test gray scale.
5. The method according to claim 1, wherein determining a target display luminance corresponding to a display gray scale of the pixel according to the second mapping relationship comprises:
obtaining a scaling coefficient of the display gray scale;
determining a mapping gray scale corresponding to the display gray scale according to the scaling coefficient;
and determining the target display brightness corresponding to the display gray scale according to the mapping gray scale and the second mapping relation.
6. The method according to claim 1, wherein determining the target gray scale of the pixel according to the first mapping relationship and the target display luminance comprises:
determining a gray scale calculation value of the target display brightness under the first mapping relation;
judging that the target display brightness meets a first preset condition according to the target display brightness, the gray scale calculation value and the first mapping relation; the first preset condition is that the target display brightness is less than or equal to Lj +1', and the target display brightness is greater than or equal to Lj'; wherein j is an integer of the gray scale calculation value, and Lj +1' is the display brightness corresponding to the gray scale of j +1 under the first mapping relation; lj' is the display brightness corresponding to the j gray scale under the first mapping relation;
and if so, determining the rounding value of the gray scale calculation value as the target gray scale of the pixel.
7. The method of claim 6, wherein determining a target gray level of the pixel according to the first mapping relationship and the target display brightness, further comprises:
if the target display brightness is larger than Lj +1', determining j +1 as an integer of the gray scale calculated value, and returning to execute the step of judging that the target display brightness meets a first preset condition according to the target display brightness, the gray scale calculated value and the first mapping relation; alternatively, the first and second electrodes may be,
and if the target display brightness is smaller than Lj', determining j-1 as an integer of the gray scale calculation value, and returning to execute the step of judging that the target display brightness meets a first preset condition according to the target display brightness, the gray scale calculation value and the first mapping relation.
8. The control method of a display panel according to claim 1, further comprising:
and when other frame pictures of the next display picture are displayed, providing data signals corresponding to the display gray scale for the pixels.
9. A control apparatus for a display panel, the display panel including a plurality of pixels arranged in an array, the control apparatus comprising:
the mapping relation acquisition module is used for acquiring a first mapping relation between the display brightness and the gray scale of the pixel in a first frame picture and a second mapping relation between the display brightness and the gray scale of the pixel in a second frame picture when the gray scale of 0 is switched to other gray scales;
the display gray scale acquisition module is used for acquiring the display gray scale of the pixel in the next display picture if the data signal of the pixel in the current display picture is the data signal corresponding to the 0 gray scale;
the target brightness determining module is used for determining target display brightness corresponding to the display gray scale of the pixel according to the second mapping relation;
the target gray scale determining module is used for determining the target gray scale of the pixel according to the first mapping relation and the target display brightness;
and the display driving module is used for providing a data signal corresponding to the target gray scale for the pixel when the first frame picture of the next display picture is displayed.
10. A display device, comprising: a display panel and a driving chip;
the driving chip is used for executing the control method of the display panel according to any one of claims 1 to 8 when driving the display panel to display the picture.
11. A computer-readable storage medium storing computer instructions for causing a processor to implement the control method of the display panel according to any one of claims 1 to 8 when executed.
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