A method for driving a display panel and a display panel

Abstract

The present application discloses a driving method of a display panel and a display panel, and relates to the field of display technology. The display panel includes a plurality of pixel units and a pixel driving circuit correspondingly connected to the plurality of pixel units. The pixel driving circuit controls the turn-on time of pixels in the plurality of pixel units through a driving signal. The display screen of the display panel includes a first frame screen, an Nth frame screen and an Mth frame screen, and the Mth frame screen is a standard frame screen. The brightness of the first frame screen and the Nth frame screen is lower than that of the Mth frame screen. The driving signal includes a first cycle signal, an Nth cycle signal and an Mth cycle signal, and the duty cycle of the driving signal in the first cycle signal is adjusted to be greater than the duty cycle of the Nth cycle signal, and the duty cycle of the driving signal in the Nth cycle signal is adjusted to be greater than the standard duty cycle. The brightness of the first frame screen and the brightness of the Nth frame screen are the same or close to the brightness of the Mth frame screen, so as to avoid the presence of a ghosting phenomenon when the display panel displays an image.

Description

[0001] This application claims priority to a Chinese patent application filed with the State Intellectual Property Office on December 29, 2023, with application number 202311870276.0 and invention name “A driving method for a display panel and a display panel”, the entire contents of which are incorporated by reference in this application. Technical Field

[0002] Embodiments of the present application relate to the field of display technology, and in particular, to a display panel driving method and a display panel. Background Art

[0003] With the development of display technology, organic light emitting diode (OLED) display panels have been increasingly widely used due to their advantages such as lightness, flexibility, high contrast, and wide color gamut. However, in low grayscale usage scenarios, when dragging the display screen, the display panel has technical problems such as screen ghosting, which reduces the image quality of the display panel and affects the user experience. Summary of the invention

[0004] The embodiments of the present application provide a display panel driving method and a display panel, which are used to solve the problem that when a display screen of the display panel is dragged in a low grayscale usage scenario, the display panel has a screen ghosting problem.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a method for driving a display panel is provided, wherein the display panel includes a plurality of pixel units and a pixel driving circuit correspondingly connected to the plurality of pixel units, wherein the pixel units include green pixels. A display screen of the display panel includes a first frame screen, an Nth frame screen, and an Mth frame screen, wherein the Mth frame screen is a standard frame screen, N>1, M≥N, and N and M are both positive integers. The pixel driving circuit controls the opening time of pixels in the plurality of pixel units through a driving signal, wherein the driving signal includes a first period signal, an Nth period signal, and an Mth period signal.

[0007] The first periodic signal of the driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the first frame, and the Nth periodic signal of the driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the Nth frame. The duty cycle of the first periodic signal in the driving signal is the first duty cycle of the driving signal, the duty cycle of the Nth periodic signal in the driving signal is the Nth duty cycle of the driving signal, and the duty cycle of the Mth periodic signal in the driving signal is the standard duty cycle of the driving signal. The first duty cycle of the driving signal is greater than the Nth duty cycle of the driving signal, and the Nth duty cycle of the driving signal is greater than the standard duty cycle of the driving signal.

[0008] On this basis, by increasing the first duty cycle of the driving signal and increasing the Nth duty cycle of the driving signal, the turn-on time of the green pixel in the display unit when displaying the first frame is increased, and the brightness of the first frame and the Nth frame displayed by the pixel unit in the display panel can be increased when other influencing factors (such as charging current) remain unchanged. The brightness of one or more frames with lower brightness before the standard frame is increased to avoid the phenomenon of ghosting.

[0009] In a possible implementation of the first aspect, the pixel driving circuit includes a first driving circuit, and the pixel unit also includes a red pixel and a blue pixel. The driving signal includes a first driving signal, and the first driving circuit controls the turn-on time of pixels in multiple pixel units through the first driving signal. The first driving signal includes a first periodic signal, an Nth periodic signal, and an Mth periodic signal. The first periodic signal of the first driving signal simultaneously controls the turn-on time of red pixels, green pixels, and blue pixels when multiple pixel units display the first frame. The Nth periodic signal of the first driving signal simultaneously controls the turn-on time of red pixels, green pixels, and blue pixels when multiple pixel units display the Nth frame. The Mth periodic signal of the first driving signal simultaneously controls the turn-on time of red pixels, green pixels, and blue pixels when multiple pixel units display the Mth frame.

[0010] The duty cycle of the first periodic signal in the first drive signal is the first duty cycle of the first drive signal, the duty cycle of the Nth periodic signal in the first drive signal is the Nth duty cycle of the first drive signal, and the duty cycle of the Mth periodic signal in the first drive signal is the standard duty cycle of the first drive signal. The first duty cycle of the first drive signal is greater than the Nth duty cycle of the first drive signal, and the Nth duty cycle of the first drive signal is greater than the standard duty cycle of the first drive signal.

[0011] On this basis, by increasing the first duty cycle of the first driving signal and increasing the Nth duty cycle of the first driving signal, the opening time of all pixels in the display unit, including red pixels, green pixels and blue pixels, when displaying the first frame is increased, and the brightness of the first frame and the Nth frame displayed by the pixel unit in the display panel can be increased when other influencing factors (such as charging current) remain unchanged. In this way, the brightness of one or more frames with lower brightness before the standard frame is increased to avoid the phenomenon of smearing.

[0012] In a possible implementation of the first aspect, a diamond arrangement is adopted between red pixels, green pixels and blue pixels to form multiple rows of pixels, a first driving circuit controls the multiple rows of pixels on a row basis, and pixels in each row are electrically connected to the first driving circuit. In any two adjacent rows of pixels, pixels in one row are arranged in sequence according to the rule of "red pixels, green pixels, blue pixels, green pixels", and pixels in the other row are arranged in sequence according to the rule of "blue pixels, green pixels, red pixels, green pixels".

[0013] This implementation method provides a specific pixel arrangement method in the display panel and a connection method with the driving circuit.

[0014] In a possible implementation of the first aspect, the first duty cycle of the first drive signal is the product of the reciprocal of the first frame brightness ratio and the standard duty cycle of the first drive signal, and the Nth duty cycle of the first drive signal is the product of the reciprocal of the Nth frame brightness ratio and the standard duty cycle of the first drive signal. The first frame brightness ratio is the ratio of the brightness of the first frame to the brightness of the Mth frame, and the Nth frame brightness ratio is the ratio of the brightness of the Nth frame to the brightness of the Mth frame.

[0015] On this basis, the design method provides a specific way to adjust the duty cycle. Through the above adjustment method, the brightness of the first frame and the Nth frame displayed by the pixel unit in the display panel can be increased, and the brightness of the first frame and the Nth frame can be adjusted to the brightness of the standard frame. In this way, the brightness of one or more frames with lower brightness before the standard frame can be adjusted to the same or approximately the same as the brightness of the standard frame, avoiding the phenomenon of ghosting.

[0016] In a possible implementation manner of the first aspect, a standard duty cycle of the first driving signal is less than or equal to 90%.

[0017] In a possible implementation manner of the first aspect, a standard duty cycle of the first driving signal is 5%-10%.

[0018] In a possible implementation of the first aspect, the pixel driving circuit includes a second driving circuit and a third driving circuit, and the pixel unit also includes a red pixel and a blue pixel. The green pixels in the plurality of pixel units are all electrically connected to the second driving circuit, and the red pixels and the blue pixels in the plurality of pixel units are all electrically connected to the third driving circuit. The driving signal includes a second driving signal and a third driving signal, and the second driving circuit controls the turn-on time of the green pixels in the plurality of pixel units through the second driving signal, and the third driving circuit controls the turn-on time of the red pixels and the blue pixels in the plurality of pixel units through the third driving signal. The second driving signal and the third driving signal both include a first cycle signal, an Nth cycle signal, and an Mth cycle signal. The first cycle signal of the second driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the first frame. The Nth cycle signal of the second driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the Nth frame. The Mth cycle signal of the second driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the Mth frame. The duty cycle of the first periodic signal in the second drive signal is the first duty cycle of the second drive signal, the duty cycle of the Nth periodic signal in the second drive signal is the Nth duty cycle of the second drive signal, and the duty cycle of the Mth periodic signal in the second drive signal is the standard duty cycle of the second drive signal. The first duty cycle of the second drive signal is greater than the Nth duty cycle of the second drive signal, and the Nth duty cycle of the second drive signal is greater than the standard duty cycle of the second drive signal.

[0019] On this basis, two driving circuits are set, one of which controls all green pixels individually, and the other controls all red pixels and blue pixels. Therefore, by controlling the driving control circuit of all green pixels to output a corresponding driving signal (second driving signal), multiple pixel units can increase the turn-on time of all green pixels individually when displaying the first frame and the Nth frame. By controlling the driving control circuit of all red pixels and blue pixels to output a corresponding driving signal (third driving signal), multiple pixel units can increase the turn-on time of all red pixels and blue pixels individually when displaying the first frame and the Nth frame. Individual control of the turn-on time of all green pixels and individual control of the turn-on time of red pixels and blue pixels are achieved. The brightness of one or more frames with lower brightness before the standard frame is increased, and the adjustment is more precise. While improving the ghosting phenomenon of the display panel at low brightness, the effect of improving ΔRGB can also be achieved.

[0020] In a possible implementation of the first aspect, the first periodic signal of the third drive signal controls the turn-on time of red pixels and blue pixels when multiple pixel units display the first frame. The Nth periodic signal of the third drive signal controls the turn-on time of red pixels and blue pixels when multiple pixel units display the Nth frame. The Mth periodic signal of the third drive signal controls the turn-on time of red pixels and blue pixels when multiple pixel units display the Mth frame. The duty cycle of the first periodic signal in the third drive signal is the first duty cycle of the third drive signal; the duty cycle of the Nth periodic signal in the third drive signal is the Nth duty cycle of the third drive signal, and the duty cycle of the Mth periodic signal in the third drive signal is the standard duty cycle of the third drive signal. The first duty cycle of the third drive signal is greater than the Nth duty cycle of the third drive signal, and the Nth duty cycle of the third drive signal is greater than the standard duty cycle of the third drive signal.

[0021] In a possible implementation of the first aspect, a diamond arrangement is adopted between red pixels, green pixels and blue pixels to form multiple rows of pixels, and the multiple rows of pixels include green pixel rows and red and blue pixel alternating rows. The second driving circuit is electrically connected to the pixels in all green pixel rows, and the third driving circuit is electrically connected to the pixels in all red and blue pixel alternating rows. The pixels in the green pixel row are all green pixels, and the pixels in the red and blue pixel alternating rows are arranged according to the rule of alternating red pixels and blue pixels.

[0022] This implementation provides another specific pixel arrangement method in the display panel and a connection method with the driving circuit.

[0023] In a possible implementation of the first aspect, the first duty cycle of the second drive signal is the product of the inverse of the brightness ratio of the first frame of the green picture and the standard duty cycle of the second drive signal, and the Nth duty cycle of the second drive signal is the product of the inverse of the brightness ratio of the Nth frame of the green picture and the standard duty cycle of the second drive signal. The first duty cycle of the third drive signal is the product of the inverse of the brightness ratio of the first frame of the blue picture and the standard duty cycle of the third drive signal, and the Nth duty cycle of the third drive signal is the product of the inverse of the brightness ratio of the Nth frame of the blue picture and the standard duty cycle of the third drive signal.

[0024] The first frame brightness ratio of the green picture is the ratio of the brightness of the first frame of the green picture to the brightness of the Mth frame of the green picture, and the Nth frame brightness ratio of the green picture is the ratio of the brightness of the Nth frame of the green picture to the brightness of the Mth frame of the green picture. The first frame brightness ratio of the blue picture is the ratio of the brightness of the first frame of the blue picture to the brightness of the Mth frame of the blue picture, and the Nth frame brightness ratio of the blue picture is the ratio of the brightness of the Nth frame of the blue picture to the brightness of the Mth frame of the blue picture.

[0025] On this basis, the design method provides a specific way to adjust the duty cycle. Through the above adjustment method, the brightness of the first frame and the Nth frame displayed by the pixel unit in the display panel can be increased, and the pixels of different colors in the display panel can be controlled separately. The brightness of the first frame and the Nth frame can be adjusted to the brightness of the standard frame. In this way, the brightness of one or more frames with lower brightness before the standard frame can be adjusted to the same or approximately the same as the brightness of the standard frame, avoiding the phenomenon of ghosting.

[0026] In a possible implementation manner of the first aspect, a standard duty cycle of the second drive signal is less than or equal to 90%, and a standard duty cycle of the third drive signal is less than or equal to 90%.

[0027] In a possible implementation manner of the first aspect, a standard duty cycle of the second drive signal is 5%-10%, and a standard duty cycle of the third drive signal is 5%-10%.

[0028] In a second aspect, the present application provides a display panel, which is driven by the display panel driving method in the first aspect and any possible implementation thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a display screen change in an electronic device;

[0030] Figure 2 A schematic diagram of improving the brightness of a display panel provided by the prior art;

[0031] Figure 3 A luminous brightness diagram of a green display screen provided in an embodiment of the present application that switches from a 300ms screen-off state to a light-on state;

[0032] Figure 4 A luminous brightness diagram of a red display screen provided in an embodiment of the present application that switches from a 300ms screen-off state to a light-on state;

[0033] Figure 5 A luminous brightness diagram of a blue display screen provided in an embodiment of the present application that switches from a 300ms screen-off state to a light-on state;

[0034] Figure 6 A luminous brightness diagram of a display screen showing multiple color images switching from a 300ms screen-off state to a lit state provided in an embodiment of the present application;

[0035] Figure 7 A diagram showing the luminous time ratio of the first frame when a display panel provided by the present application displays different images;

[0036] Figure 8A pixel arrangement method and circuit connection structure diagram in a display panel provided by the present application;

[0037] Fig. 9 Another pixel arrangement method and circuit connection structure diagram in a display panel provided by the present application;

[0038] Fig.10 A schematic diagram of an image refresh principle of a display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0040] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0041] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0042] It should be understood that the terms used in the description of the various examples herein are only for describing specific examples and are not intended to be limiting. As used in the description of the various examples, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0043] In this application, "at least one" means one, two or more, and "more" means more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0044] It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0045] It should also be understood that in the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can refer to the direct connection between two elements, or it can refer to the indirect connection between two elements through other elements, a fixed connection, a sliding connection, a detachable connection, or an integral molding, etc.

[0046] It should also be understood that the term “comprise” (also known as “includes,” “including,” “comprises” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0047] It should be understood that the "one embodiment", "another embodiment", "a possible design" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment or implementation are included in at least one embodiment of the present application. Therefore, "in one embodiment of the present application" or "in another embodiment of the present application", "a possible design" appearing in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0048] It should also be understood that the specific values ​​mentioned in the embodiments of the present application do not limit the specific dimensions of specific features or structures. The relevant values ​​may be examples for easy understanding, or they may be the theoretically optimal theoretical values ​​of a certain feature. In practice, the relevant dimensions may be a range of the value appended thereto, for example, the range may be ±10% of the optimal theoretical value, or ±20% of the optimal theoretical value, and in practice, the corresponding technical effect can be achieved.

[0049] With the development of display technology, organic light emitting diode (OLED) display panels have been increasingly widely used due to their advantages such as thinness, lightness, wide viewing angle, active luminescence, continuously adjustable luminous color, low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple production process, high luminous efficiency and flexible display.

[0050] However, in current OLED display panels, due to the influence of the driving circuit and device structure, when the display screen of the display panel switches from low grayscale to high grayscale at medium and low brightness, there is a common problem that the brightness of the first frame of the high grayscale display screen is lower than the normal brightness, resulting in the phenomenon of ghosting in the high grayscale display screen, which leads to a poor visual experience for users. For example, when the display screen switches from a black screen to a red screen, a green screen, a blue screen or a white screen, due to the influence of the uniformity of the thin film transistors in the driving circuit, the brightness of the first frame of the red screen, the green screen, the blue screen or the white screen will be lower than the normal brightness, resulting in the phenomenon of ghosting in the white screen, the red screen, the green screen or the blue screen.

[0051] Specifically, take the display screen in a mobile phone as an example. Figure 1 , Figure 1 The following is a schematic diagram of the changes in the display screen of an electronic device. Figure 1 As shown, Figure 1 (a) is an initial display screen in the mobile phone. The display brightness of the mobile phone in the current state is low, and the background of the current display screen is dark (black is used as an example in the embodiment of the present application). Figure 1 When the initial display screen shown in (a) is slid, due to the low display brightness of the mobile phone, the fonts in the display screen will become blurred during the sliding process, causing the screen to have a ghosting problem.

[0052] in. Figure 1 The screen shown in (b) is for Figure 1 The screen after sliding the display screen in (a). When the user slides the display screen of the mobile phone, some contents in the screen will change, while some contents will not change. Figure 1 For example, Figure 1 The display shown in (a) changes to Figure 1 During the display process shown in (b), Figure 1 The first display area in (a) mainly displays information such as signal, power and time. Figure 1 The contents displayed in the first display area of ​​(b) are the same. Figure 1 The display shown in (a) changes to Figure 1During the display process shown in (b), the image in the first display area can be understood to be unchanged. It can be understood that, in the multiple frames of the entire change process, the content in the first display area corresponding to the next frame is unchanged compared to the content in the first display area corresponding to the previous frame. Therefore, during the entire dragging process, the change of the display image in the first display area can be called a hold frame.

[0053] Continue with Figure 1 For example, Figure 1 The display shown in (a) changes to Figure 1 During the display process shown in (b), Figure 1 The content displayed in the second display area of ​​(a) is mainly background content, which is a black background with a grayscale value of 0. After dragging, Figure 1 The content displayed in the second display area of ​​(b) is text content, which is white and has a grayscale value of 255. Figure 1 The display shown in (a) changes to Figure 1 In the process of displaying the picture shown in (b), the picture in the second display area changes from low grayscale to high grayscale. It can be understood that in the multiple frames of the picture during the entire change process, the content in the second display area corresponding to the next frame is switched from low grayscale content to high grayscale content compared to the content in the second display area corresponding to the previous frame. Therefore, during the entire dragging process, the change of the display picture in the second display area can be called frame upgrade.

[0054] Continue with Figure 1 For example, Figure 1 The display shown in (a) changes to Figure 1 During the display process shown in (b), Figure 1 The third display area in (a) mainly displays text content. After dragging, Figure 1 The content displayed in the third display area of ​​(b) is the background content. Figure 1 The display shown in (a) changes to Figure 1 In the process of displaying the picture shown in (b), the picture in the third display area changes from high grayscale to low grayscale. It can be understood that in the multiple frames of the picture during the entire change process, the content in the third display area corresponding to the next frame is switched from high grayscale content to low grayscale content compared to the content in the third display area corresponding to the previous frame. Therefore, in the entire dragging process, the change of the display picture in the third display area can be called frame drop.

[0055] It should be noted that the embodiment of the present application only uses the picture changes in the "first display area", "second display area" and "third display area" as examples to illustrate the grayscale changes during the image refresh process. During the image refresh process, other display areas on the mobile phone display screen also have the above changes, that is, the image refresh process includes the three changes of "maintaining frame", "increasing frame" and "reducing frame".

[0056] In the existing technical solutions, the over-drive (OD) solution is generally used to improve this situation. Its working principle can be referred to Figure 2 , Figure 2 The following is a schematic diagram of a brightness improvement principle of a display panel provided by the prior art. Figure 2 As shown, Figure 2 Image refresh in the context of the mobile phone refers to the change of the next frame of image relative to the previous frame of image in each display area of ​​the mobile phone display screen during the dragging of the display screen. The grayscale change of the next frame of image relative to the previous frame of image includes three types of changes: "maintain frame", "increase frame" and "decrease frame".

[0057] When the image change of one of the display areas is to maintain the frame, the grayscale change of the two frames before and after the image in the display area is to remain unchanged. When the image change of another display area is to drop the frame, the grayscale change of the two frames before and after the image in the display area is to turn the grayscale (drop the grayscale), but because the grayscale drop does not cause the problems mentioned in the background technology of this application, the corresponding situation of the grayscale drop is not discussed in the embodiment of this application. When the image change of yet another display area is to increase the frame, the grayscale change of the two frames before and after the image in the display area is to increase the grayscale. In this case, the OD scheme is adopted, specifically, the grayscale compensation is performed on the low grayscale display picture in the previous frame display picture, for example, its grayscale value is increased by 32, that is, the grayscale value of the previous frame in the display area is increased from 0 to 32.

[0058] According to the gamma curve, it can be calculated that the brightness improvement capability can be increased by up to 60%. The existing OD technical solution can only compensate for the brightness of 64 grayscales, and its brightness compensation capability is limited, and it is easy to reduce the brightness difference (ΔRGB). In addition, in this solution, it is limited by the uniformity of thin film transistors (TFT) and register limitations, so its resolution is low and its improvement capability is poor.

[0059] refer to Figures 3 to 6 , Figure 3 This is a luminous brightness diagram of the green display screen provided in the embodiment of the present application, which is converted from a 300ms screen-off state to a light-on state. Figure 4 This is a luminous brightness diagram of the red display screen provided in the embodiment of the present application, which is converted from a 300ms screen-off state to a light-on state. Figure 5 This is a luminous brightness diagram of the blue display screen provided in the embodiment of the present application, which is converted from a 300ms screen-off state to a light-on state. Figure 6 This is a luminous brightness diagram of a display screen showing multiple color images that switches from a 300ms off state to a lit state provided in an embodiment of the present application. It should be noted that: Figure 3-Figure 6 The horizontal axis is time, in ms. Figures 3 to 5 All are pure color display screens. Figure 6 The display screen showing the multi-color image is a situation where the red pixels, the green pixels and the blue pixels are all lit, that is, the multi-color image screen is normally displayed.

[0060] Combination Figures 3 to 6 It can be seen that no matter the display screen displays a pure color screen of a certain color or displays a multi-color image, the luminous brightness of the first frame is darker than the luminous brightness of each subsequent frame. Figures 3 to 5 It can be seen that in the process of displaying pictures of different colors, when displaying a green pure color picture, the luminous time of the first frame is shorter than that of the first frame when displaying a red or blue pure color picture. This is because the charging current of the light-emitting device of the green pixel is small, and the charging time of the light-emitting device is insufficient during the opening cycle of the first frame of the green display picture, resulting in a shorter actual luminous time during the opening cycle.

[0061] refer to Figure 7 , Figure 7 A display panel provided in the present application shows a luminous time ratio of the first frame when displaying different images. Wherein, W represents: when displaying a display image of multiple colors, the pixels in the first frame display a luminous time ratio of different brightness; R represents: when displaying a display image of a red image, the pixels in the first frame display a luminous time ratio of different brightness; G represents: when displaying a display image of a green image, the pixels in the first frame display a luminous time ratio of different brightness; B represents: when displaying a display image of a blue image, the pixels in the first frame display a luminous time ratio of different brightness.

[0062] The standard brightness is the brightness of a stable frame when the display screen is displaying an image. The display device gradually changes from dark to standard brightness during the process of emitting light. A stable frame means that the brightness of the frame reaches 80% or more of the peak brightness, for example Figure 3 The third frame picture shown in can be called a stable frame picture. Figure 7The 10% Time means: in the first frame, the time taken for the brightness of the display device to change from 0 to 10% of the standard brightness; the 20% Time means: in the first frame, the time taken for the brightness of the display device to change from 10% of the standard brightness to 20% of the standard brightness; the EmitTime means: in the first frame, the time taken for the brightness of the display device to show the standard brightness.

[0063] from Figure 7 It can be seen that when a green image is displayed, in the first frame, the time during which the brightness of the display device displays the standard brightness is the shortest.

[0064] In an OLED display, the number of G pixels is nearly twice the number of R pixels and also nearly twice the number of B pixels, and the current of G pixels is 1 / 2 of the current of R pixels and 1 / 4 of the current of B pixels. The inventors found that the smaller charging current of G pixels and the shorter light-emitting time of G pixels are the reasons why the first frame is not bright.

[0065] In order to solve the problem of screen ghosting on a display panel when dragging a display screen in a low grayscale usage scenario, an embodiment of the present application provides a method for driving a display panel.

[0066] In the embodiment of the present application, the display screen is shown as black (low grayscale) at medium or low brightness (generally below 120 nit) as an example. Figure 1 Take the image shown in the figure as an example. The first frame of the image displayed on the display is as follows Figure 1 As shown in (a), the display screen after dragging the first frame is as follows Figure 1 As shown in (b). Among them, Figure 1 The screen shown in (a) changes to Figure 1 The picture shown in (b) in the figure also contains multiple frames, and the changes between two adjacent frames are relatively small. Figure 1 (a) and Figure 1 The screen shown in (b) is used as an example to intuitively demonstrate the screen changes before and after dragging.

[0067] The first frame includes a first display area, a second display area, and a third display area. When the first frame is dragged, part of the content in the picture remains unchanged, and part of the content changes. Figure 1 In the screen shown, Figure 1 The screen shown in (a) and Figure 1 The screens shown in (b) all include a first display area, which corresponds to the status bar at the top of the display screen. During the dragging process of the screen, the status bar generally does not change. Figure 1The screen shown in (a) and Figure 1 From the screen shown in (b), it can be seen that the content in the first display area has not changed.

[0068] During the dragging process, the text or image in the displayed screen will move in the direction of the dragging. As a result, the blank part of the previous frame will become text or image content, and the text or image content of the previous frame will become blank. Figure 1 The screen shown in (a) and Figure 1 In the screen shown in (b), Figure 1 In the screen shown in (a), the second display area is blank, and the third display area displays text. Figure 1 In the screen shown in (b), the second display area displays text, and the third display area displays blank content. Figure 1 The screen shown in (a) to Figure 1 The picture shown in (b) includes three changes: "keep frame", "increase frame" and "decrease frame". It should be noted that Figure 1 (a) and Figure 1 The first display area, the second display area and the third display area shown in (b) all refer to a fixed area in the display screen.

[0069] In an embodiment of the present application, the display panel has an array substrate and a device layer located on the array substrate. The device layer includes a plurality of pixel units, each of which includes multiple types of light-emitting devices with different luminous colors, such as a red light-emitting device, a green light-emitting device, and a blue light-emitting device. Among them, a pixel with a red light-emitting device can be called a red pixel, a pixel with a green light-emitting device can be called a green pixel, and a pixel with a blue light-emitting device can be called a blue pixel. The light-emitting device is a current-controlled device. The brightness of the light-emitting device can be controlled by controlling the size of the driving current and controlling the turn-on time of the light-emitting device (which can be generally understood as the turn-on time).

[0070] The array substrate has a pixel driving circuit electrically connected to the light-emitting device. The pixel driving circuit includes a thin film transistor (TFT). The working phases of the pixel driving circuit include a reset phase, a data writing phase, and a light-emitting phase. The data writing phase is located after the reset phase but before the light-emitting phase. The pixel driving circuit controls the opening time of the pixel in the pixel unit through a driving signal, that is, it mainly controls the data writing phase.

[0071] The driving signal is a signal for controlling the pixel unit to emit light. By controlling the duty cycle of the driving signal, the on-time of the pixel unit can be controlled, thereby controlling the luminous brightness of the pixel unit. The larger the duty cycle of the driving signal, the longer the on-time of the pixel unit; the smaller the duty cycle of the luminous control signal, the shorter the on-time of the pixel unit. When other factors remain unchanged, the longer the on-time of the pixel in the pixel unit, the higher the luminous brightness of the pixel unit. In addition, the luminous brightness of the pixel unit can also be affected by the size of the charging current of the pixel unit. Generally speaking, the larger the charging current of the pixel unit, the higher the luminous brightness of the pixel unit. Of course, the charging current of the pixel unit works in the rated current range. It should be noted that in the embodiment of the present application, when discussing the influence of the driving signal on the luminous brightness, it is assumed that the charging current remains unchanged. That is, the influence of the driving signal on the luminous brightness is discussed in the form of a control variable.

[0072] In the embodiment of the present application, the display panel includes a plurality of pixel units. Generally speaking, each pixel unit is composed of a basic red pixel, a green pixel, and a blue pixel. Of course, the pixel unit may also include a white pixel or a pixel of another color. In the present application, a pixel unit composed of a red pixel, a green pixel, and a blue pixel is taken as an example for description.

[0073] Since the display panel includes a plurality of pixel units, each pixel unit includes pixels of different colors, the display panel includes a plurality of pixels of different colors. A plurality of pixels of different colors can be arranged in a variety of arrangements, for example, a plurality of pixels of different colors can be arranged in an RGB arrangement based on row control, or in an RGB Delta (Δ) arrangement, or in a Pentile arrangement (P arrangement for short), or in a diamond arrangement. In the embodiment of the present application, the diamond arrangement is used for red pixels, green pixels, and blue pixels.

[0074] When the display panel displays an image, it is generally composed of multiple frames, including the first frame, the Nth frame and the Mth frame, wherein the Nth frame is the picture after the first frame, and the Mth frame is the picture after the Nth frame. N>1, M≥N, N and M are both positive integers. If the brightness of the first few frames of the display panel is low, the brightness of the picture is stable until the Mth frame. Then the display panel will produce a ghosting phenomenon in the process of displaying the image or displaying the picture. Therefore, it is necessary to adjust the brightness of the first few frames so that the brightness of the adjusted picture is the same as the brightness of the picture in the normal state (the brightness of the Mth frame), so that the ghosting phenomenon can be avoided. Among them, the Mth frame and the picture with a stable brightness after the Mth frame are called standard frame pictures, and the standard frame picture refers to the frame whose brightness reaches 95% or more of the peak brightness.

[0075] In one or more frames before the Mth frame, the brightness of the first frame is generally the lowest, and the brightness of the frames between the first frame and the Mth frame gradually increases. For example, M=5, the brightness of the first frame is lower than the brightness of the second frame, the brightness of the second frame is lower than the brightness of the third frame, the brightness of the third frame is lower than the brightness of the fourth frame, and the brightness of the fourth frame is lower than the brightness of the fifth frame.

[0076] In the embodiment of the present application, the pixel driving circuit controls the turn-on time of the pixels in the multiple pixel units of the display panel through the driving signal, and the driving signal includes a first period signal, an Nth period signal and an Mth period signal. The first period signal of the driving signal controls the turn-on time of the green pixels when the multiple pixel units display the first frame, and the Nth period signal of the driving signal controls the turn-on time of the green pixels when the multiple pixel units display the Nth frame.

[0077] The duty cycle of the first periodic signal in the driving signal is the first duty cycle of the driving signal, the duty cycle of the Nth periodic signal in the driving signal is the Nth duty cycle of the driving signal, and the duty cycle of the Mth periodic signal in the driving signal is the standard duty cycle of the driving signal. The standard duty cycle is also the duty cycle of the periodic signal corresponding to the standard frame image in the driving signal.

[0078] In order to improve the brightness of the picture between the Mth frame pictures, in an embodiment of the present application, the first duty cycle of the driving signal is greater than the Nth duty cycle of the driving signal, and the Nth duty cycle of the driving signal is greater than the standard duty cycle of the driving signal. Specifically, it can be set that the first duty cycle of the driving signal is the product of the reciprocal of the first frame brightness ratio and the standard duty cycle of the driving signal, and the Nth duty cycle of the driving signal is the product of the reciprocal of the Nth frame brightness ratio and the standard duty cycle of the driving signal. Among them, the first frame brightness ratio is the ratio of the brightness of the first frame picture to the brightness of the Mth frame picture; the Nth frame brightness ratio is the ratio of the brightness of the Nth frame picture to the brightness of the Mth frame picture.

[0079] The solution introduced in the embodiment of the present application is described below in conjunction with the specific pixel arrangement and circuit connection structure of the display panel.

[0080] refer to Figure 8 , Figure 8 The present application provides a pixel arrangement method and a circuit connection structure diagram in a display panel. Figure 8As shown, multiple pixels in the display panel are arranged in diamonds and controlled by a row-based control scheme. Row-based control means that multiple pixels in the display panel are arranged in multiple rows, the pixel driving circuit is electrically connected to the pixels in each row, and the driving signal output by the pixel driving circuit controls the pixels in each row in units of rows. Specifically, multiple pixels in the display panel are arranged in diamonds, including multiple rows of pixels, each row including red pixels, green pixels and blue pixels. Among them, the pixels in two adjacent rows are arranged according to a certain rule, for example, the pixel arrangement in the upper row (or the lower row) is arranged in sequence according to the rule of "red pixel, green pixel, blue pixel, green pixel", and the pixel arrangement in the lower row (or the upper row) is arranged in sequence according to the rule of "blue pixel, green pixel, red pixel, green pixel". Then, according to the rule of alternating arrangement of the upper row and the lower row, the pixel arrangement in the entire display panel is formed. For example, the pixels in the upper row are arranged as red pixel, green pixel, blue pixel, green pixel, red pixel, green pixel, blue pixel, green pixel, red pixel, green pixel, blue pixel, green pixel... The pixels in the lower row are arranged as blue pixel, green pixel, red pixel, green pixel, blue pixel, green pixel, red pixel, green pixel, blue pixel, green pixel, red pixel, green pixel...

[0081] like Figure 8 As shown, each pixel in each row of pixel units in the display panel is controlled by a first driving circuit, and a first driving signal output by the first driving circuit controls the turn-on time of each pixel. The first driving signal is a timing signal, for example, a square wave signal can be used. The first driving signal includes a plurality of periodic signals, specifically, a first periodic signal, an Nth periodic signal and an Mth periodic signal, N>1, M≥N, and M and N are positive integers. Taking M=5 as an example, the Nth periodic signal may include a second periodic signal, a third periodic signal and a fourth periodic signal.

[0082] Among them, the first cycle signal in the first driving signal is used to control the pixel turn-on time when multiple pixel units display the first frame of the picture, because the pixel turn-on time will affect the luminous brightness of the pixel, thereby affecting the display of the first frame of the picture. Correspondingly, the second cycle signal in the first driving signal is used to control the pixel turn-on time when multiple pixel units display the second frame of the picture. The third cycle signal in the first driving signal is used to control the pixel turn-on time when multiple pixel units display the third frame of the picture, and the fourth cycle signal in the first driving signal is used to control the pixel turn-on time when multiple pixel units display the fourth frame of the picture.

[0083] Therefore, the Nth period signal in the first driving signal is used to control the pixel turn-on time when the plurality of pixel units display the Nth frame, and the Mth period signal in the first driving signal is used to control the pixel turn-on time when the plurality of pixel units display the Mth frame. Since the pixel turn-on time affects the luminous brightness of the pixel, it further affects the display of the corresponding frame.

[0084] The key to the first driving signal controlling the pixel in the pixel unit to turn on is the duty cycle of each periodic signal, that is, the turn-on time of the pixel in the pixel unit before displaying each frame is determined by the duty cycle of the periodic signal corresponding to each frame in the first driving signal. For the convenience of description, the duty cycle of the first periodic signal is the first duty cycle, and the duty cycle of the Nth periodic signal is the Nth duty cycle. That is, in the first driving signal, the duty cycle of the first periodic signal is the first duty cycle, the duty cycle of the second periodic signal is the second duty cycle, the duty cycle of the third periodic signal is the third duty cycle, the duty cycle of the fourth periodic signal is the fourth duty cycle... The duty cycle of the Nth periodic signal is the Nth duty cycle, and the duty cycle of the Mth periodic signal is the Mth duty cycle (standard duty cycle).

[0085] In an embodiment of the present application, the first duty cycle of the first drive signal is set to be greater than the Nth duty cycle of the first drive signal, and the Nth duty cycle of the first drive signal is greater than the standard duty cycle of the first drive signal. Specifically, the first duty cycle of the first drive signal is set to be the product of the first frame brightness ratio and the standard duty cycle of the first drive signal, and the Nth duty cycle of the first drive signal is set to be the product of the Nth frame brightness ratio and the standard duty cycle of the first drive signal. Among them, the first frame brightness ratio is the ratio of the brightness of the first frame to the brightness of the Mth frame, and the Nth frame brightness ratio is the ratio of the brightness of the Nth frame to the brightness of the Mth frame.

[0086] Among them, the first duty cycle of the first drive signal and / or the Nth duty cycle of the first drive signal are theoretically less than 100%. Generally speaking, an upper limit can be set for the first duty cycle of the first drive signal and the Nth duty cycle of the first drive signal. When the result of the first duty cycle of the first drive signal and the Nth duty cycle of the first drive signal calculated according to the above method is greater than the upper limit, the value of the first duty cycle of the first drive signal and the Nth duty cycle of the first drive signal is the upper limit. The upper limit can be set to be less than 100%, and can be specifically set to 90%, 95%, 98%, etc. For example, the upper limit is 90%. When the first duty cycle of the first drive signal is calculated to be greater than 90%, the first duty cycle of the first drive signal can be set to 90%. When the Nth duty cycle of the first drive signal is calculated to be greater than 90%, the Nth duty cycle of the first drive signal can be set to 90%.

[0087] In an embodiment of the present application, the standard duty cycle of the first driving signal corresponding to the standard frame image can be set to be less than or equal to 90%, for example, can be set to 5%-10%, specifically can be set to about 5%, about 8% or about 10%.

[0088] Take the standard duty cycle of the first driving signal corresponding to the standard frame as 10%, M=5 as an example. If the brightness of the first frame is 20% of the brightness of the standard frame (fifth frame), the brightness ratio of the first frame is 0.2. Correspondingly, the first duty cycle of the first driving signal can be set to (1 / 0.2)*10%=50%.

[0089] If the brightness of the second frame is 40% of the brightness of the standard frame (fifth frame), the brightness ratio of the second frame is 0.4. Correspondingly, the second duty cycle of the first drive signal can be set to (1 / 0.4)*10%=25%. If the brightness of the third frame is 60% of the brightness of the standard frame (fifth frame), the brightness ratio of the third frame is 0.6. Correspondingly, the third duty cycle of the first drive signal can be set to (1 / 0.6)*10%=16.7%. If the brightness of the fourth frame is 80% of the brightness of the standard frame (fifth frame), the brightness ratio of the fourth frame is 0.8. Correspondingly, the fourth duty cycle of the first drive signal can be set to (1 / 0.8)*10%=12.5%.

[0090] It should be noted that the size of the first duty cycle can be set according to the actual display conditions of the display panel. Its main goal is to increase the turn-on time of the green pixel in the pixel unit, increase the brightness of the first frame and the Nth frame, make them the same or approximately the same as the brightness of the standard frame, and avoid ghosting.

[0091] By increasing the first duty cycle of the first driving signal and specifically setting the first duty cycle of the first driving signal to be the product of the first frame brightness ratio and the standard duty cycle of the first driving signal, the turn-on time of the green pixel in the display unit when displaying the first frame is increased, and when other influencing factors (such as charging current) remain unchanged, the brightness of the first frame displayed by the pixel unit in the display panel can be increased, and the brightness of the first frame can be adjusted to the brightness of the standard frame.

[0092] Similarly, by increasing the Nth duty cycle of the first driving signal, and specifically setting the Nth duty cycle of the first driving signal to be the product of the Nth frame brightness ratio and the standard duty cycle of the first driving signal, the turn-on time of the green pixel in the display unit when displaying the Nth frame is increased, and when other influencing factors (such as charging current) remain unchanged, the brightness of the Nth frame displayed by the pixel unit in the display panel can be increased, and the brightness of the Nth frame can be adjusted to the brightness of the standard frame. In this way, the brightness of one or more frames of images with lower brightness before the standard frame can be adjusted to be the same or approximately the same as the brightness of the standard frame.

[0093] In the embodiment of the present application, Figure 8 In the pixel arrangement and circuit structure shown, the turn-on time of pixels of all colors is controlled by the first drive signal in the first drive circuit. Therefore, when the duty cycle of the first period signal in the first drive signal is increased, and the duty cycle of the Nth period signal in the first drive signal is increased. When displaying the first frame and the Nth frame, the turn-on time of pixels of all colors (red pixels, green pixels and blue pixels) is increased (the degree of increase is determined by the degree of increase of the corresponding duty cycle).

[0094] By increasing the first duty cycle of the first drive signal in the first cycle, and increasing the duty cycle of the Nth cycle signal in the first drive signal, the first duty cycle is made greater than the Nth duty cycle, and the Nth duty cycle is greater than the standard duty cycle. The turn-on time of the green pixel is increased, thereby increasing the luminous time of the green pixel, and further increasing the brightness of the first frame and the Nth frame displayed by the display panel. The problem that the brightness of the first frame is lower than the normal brightness and the brightness of the Nth frame is lower than the normal brightness when the display panel switches from low grayscale to high grayscale at medium and low brightness is solved, and the phenomenon of ghosting of the display screen is avoided.

[0095] In another embodiment of the present application, another display panel is provided, wherein the arrangement of pixels and the circuit connection structure in the display panel can refer to Fig. 9 . Fig. 9 Another arrangement of pixels in a display panel and a circuit connection structure diagram provided by the present application. Fig. 9 As shown, the multiple pixels in the display panel are arranged in a diamond pattern and controlled by a row-based control scheme. Specifically, the multiple pixels in the display panel are arranged in a diamond pattern, and the display panel includes multiple rows of pixels. Figure 8 The arrangement shown is different in that Fig. 9 In the display panel shown in FIG. 1 , green pixels are arranged alone in a row, and blue pixels and red pixels are arranged alternately in rows adjacent to the green pixel row. Fig. 9As shown, in the pixel arrangement of two adjacent rows, the pixels in the upper row (or the lower row) are arranged according to the rule of alternating red pixels and blue pixels, and the pixels in the lower row (or the upper row) are all green pixels. For the convenience of description, the row in which the pixels are arranged according to the alternating arrangement of red pixels and blue pixels is called the red-blue pixel alternating row, and the row with only green pixels is called the green pixel row. According to the rule of alternating red-blue pixel alternating rows and green pixel rows, the pixel arrangement in the entire display panel is formed.

[0096] like Fig. 9 As shown, the display panel includes two groups of pixel driving circuits. For the convenience of distinction, one group of pixel driving circuits is called the second driving circuit, and the other group of pixel driving circuits is called the third driving circuit. The second driving circuit is electrically connected to the green pixels in all green pixel rows, and the third driving circuit is electrically connected to the red pixels and blue pixels in all red and blue pixel alternating rows. The second driving circuit outputs a second driving signal to control the turn-on time of all green pixels. The third driving circuit outputs a third driving signal to control the turn-on time of all red pixels and blue pixels.

[0097] The second driving signal includes a plurality of periodic signals, specifically, a first periodic signal, an Nth periodic signal and an Mth periodic signal, where N>1, M≥N, and both N and M are positive integers.

[0098] The first periodic signal in the second driving signal is used to control the turn-on time of the green pixel when the plurality of pixel units display the first frame, and correspondingly, the Nth periodic signal in the second driving signal is used to control the turn-on time of the green pixel when the plurality of pixel units display the Nth frame. The turn-on time of the green pixel will affect the luminous brightness of the green pixel, thereby affecting the display brightness of the picture.

[0099] Correspondingly, the third drive signal also includes multiple periodic signals, specifically, the first periodic signal, the Nth periodic signal and the Mth periodic signal. It should be noted that, since the pixel unit is composed of pixels of multiple colors, in the embodiment of the present application, the period size of each corresponding periodic signal in the second drive signal and the third drive signal is the same. For example, the period size of the first periodic signal in the second drive signal is the same as the period size of the first periodic signal in the third drive signal; the period size of the Nth periodic signal in the second drive signal is the same as the period size of the Nth periodic signal in the third drive signal.

[0100] The first periodic signal in the third driving signal is used to control the opening time of red pixels and blue pixels when the plurality of pixel units display the first frame. The Nth periodic signal in the third driving signal is used to control the opening time of red pixels and blue pixels when the plurality of pixel units display the Nth frame.

[0101] In the second driving signal, the duty cycle of the first period signal is called the first duty cycle, and the duty cycle of the Nth period signal is called the Nth duty cycle. That is, in the second driving signal, the duty cycle of the first period signal is the first duty cycle, the duty cycle of the second period signal is the second duty cycle, the duty cycle of the third period signal is the third duty cycle, the duty cycle of the fourth period signal is the fourth duty cycle... The duty cycle of the Nth period signal is the Nth duty cycle, and the duty cycle of the Mth period signal is the Mth duty cycle (standard duty cycle).

[0102] In the third driving signal, the duty cycle of the first period signal is also referred to as the first duty cycle, and the duty cycle of the Nth period signal is also referred to as the Nth duty cycle. That is, in the third driving signal, the duty cycle of the first period signal is the first duty cycle, the duty cycle of the second period signal is the second duty cycle, the duty cycle of the third period signal is the third duty cycle, the duty cycle of the fourth period signal is the fourth duty cycle... the duty cycle of the Nth period signal is the Nth duty cycle, and the duty cycle of the Mth period signal is the Mth duty cycle (standard duty cycle).

[0103] It should be noted that, in different driving signals (the second driving signal and the third driving signal), the first duty cycle may be the same or different; the Nth duty cycle may be the same or different; and the Mth duty cycle may be the same or different.

[0104] In one embodiment of the present application, the first duty cycle of the second drive signal is set to be greater than the Nth duty cycle of the second drive signal, and the Nth duty cycle of the second drive signal is greater than the standard duty cycle of the second drive signal. Specifically, the first duty cycle of the second drive signal is set to be the product of the reciprocal of the brightness ratio of the first frame of the green picture and the standard duty cycle of the second drive signal, and the Nth duty cycle of the second drive signal is the product of the reciprocal of the brightness ratio of the Nth frame of the green picture and the standard duty cycle of the second drive signal. Among them, the brightness ratio of the first frame of the green picture is the ratio of the brightness of the first frame of the green picture to the brightness of the Mth frame of the green picture, and the brightness ratio of the Nth frame of the green picture is the ratio of the brightness of the Nth frame of the green picture to the brightness of the Mth frame of the green picture. The brightness of the first frame of the green picture refers to the brightness of the first frame of the picture when the display panel displays a pure green picture. The brightness of the Nth frame of the green picture refers to the brightness of the Nth frame of the picture when the display panel displays a pure green picture. The brightness of the Mth frame of the green picture refers to the brightness of the Mth frame of the picture when the display panel displays a pure green picture.

[0105] The first duty cycle of the third drive signal is set to be greater than the Nth duty cycle of the third drive signal, and the Nth duty cycle of the third drive signal is greater than the standard duty cycle of the third drive signal. Specifically, the first duty cycle of the third drive signal can be set to be the product of the reciprocal of the brightness ratio of the first frame of the blue picture and the standard duty cycle of the third drive signal, and the Nth duty cycle of the third drive signal can be set to be the product of the reciprocal of the brightness ratio of the Nth frame of the blue picture and the standard duty cycle of the third drive signal. Among them, the brightness ratio of the first frame of the blue picture is the ratio of the brightness of the first frame of the blue picture to the brightness of the Mth frame of the blue picture, and the brightness ratio of the Nth frame of the blue picture is the ratio of the brightness of the Nth frame of the blue picture to the brightness of the Mth frame of the blue picture. The brightness of the first frame of the blue picture refers to the brightness of the first frame of the picture when the display panel displays a pure blue picture. The brightness of the Nth frame of the blue picture refers to the brightness of the Nth frame of the picture when the display panel displays a pure blue picture. The brightness of the Mth frame of the blue picture refers to the brightness of the Mth frame of the picture when the display panel displays a pure blue picture.

[0106] The first duty cycle of the second drive signal, the Nth duty cycle of the second drive signal, the first duty cycle of the third drive signal, and the Nth duty cycle of the third drive signal are theoretically less than 100%. Generally speaking, an upper limit can be set for the first duty cycle of the second drive signal, the Nth duty cycle of the second drive signal, the first duty cycle of the third drive signal, and the third drive signal.

[0107] When the result calculated according to the above method is greater than the upper limit of the value, the corresponding duty cycle is set to the upper limit of the value. The upper limit of the value can be set to be less than 100%, and can be specifically set to 90%, 95%, 98%, etc. For example, the upper limit of the value is 90%. When the first duty cycle of the second drive signal is calculated to be greater than 90%, the first duty cycle of the second drive signal can be set to 90%. When the Nth duty cycle of the second drive signal is calculated to be greater than 90%, the Nth duty cycle of the second drive signal can be set to 90%. When the first duty cycle of the third drive signal is calculated to be greater than 90%, the first duty cycle of the third drive signal can be set to 90%. When the Nth duty cycle of the third drive signal is calculated to be greater than 90%, the Nth duty cycle of the third drive signal can be set to 90%.

[0108] The adjustment principle is the same as that in the aforementioned embodiment, and the adjustment can be performed with reference to the examples listed in the aforementioned embodiment, and no separate examples are given here. The difference is that in this embodiment, the turn-on time of the green pixel needs to be adjusted separately, and the turn-on time of the red pixel and the blue pixel need to be adjusted at the same time. In the aforementioned embodiment, the red pixel, the green pixel and the blue pixel are adjusted at the same time.

[0109] By increasing the first duty cycle of the second driving signal, and specifically setting the first duty cycle of the second driving signal to be the product of the inverse of the first frame brightness ratio of the green picture and the standard duty cycle of the second driving signal, the turn-on time of the green pixel in the display unit when displaying the first frame is increased, and when other influencing factors (such as charging current) remain unchanged, the brightness of the first frame displayed by the pixel unit in the display panel can be increased, and the brightness of the first frame can be adjusted to the brightness of the standard frame.

[0110] Similarly, by increasing the Nth duty cycle of the second driving signal, and specifically setting the Nth duty cycle of the second driving signal to be the product of the inverse of the brightness ratio of the Nth frame of the green picture and the standard duty cycle of the second driving signal, the turn-on time of the green pixel in the display unit when displaying the Nth frame is increased, and when other influencing factors (such as charging current) remain unchanged, the brightness of the Nth frame displayed by the pixel unit in the display panel can be increased, and the brightness of the Nth frame can be adjusted to the brightness of the standard frame. In this way, the brightness of one or more frames of pictures with lower brightness before the standard frame can be adjusted to be the same or approximately the same as the brightness of the standard frame.

[0111] Through the analysis of the above embodiments, it can be known that since the turn-on time of the red pixel and the blue pixel have different effects on the brightness of the first frame, the first duty cycle of the third driving signal and the Nth duty cycle of the third driving signal can be set to adjust the brightness of the red pixel and the blue pixel when the display unit displays different frames.

[0112] In the embodiment of the present application, the standard duty cycle of the second driving signal corresponding to the standard frame image can be set to be less than or equal to 90%, for example, it can be set to 5%-10%. The standard duty cycle of the third driving signal corresponding to the standard frame image can also be set to be less than or equal to 90%, for example, it can be set to 5%-10%. Specifically, it can be set to about 5%, about 8% or about 10%.

[0113] Fig. 9 The display panel shown is Figure 8 The differences between the display panels shown are: Figure 8 In the display panel shown, the opening time of all pixels in the pixel unit when displaying the first frame is increased indiscriminately, that is, while increasing the opening time of the green pixel when displaying the first frame, the opening time of the red pixel and the blue pixel when displaying the first frame is also increased, which is beneficial to improving the first frame brightness ratio of the white picture. Fig. 9In the display panel shown, two driving circuits are set, one of which controls all green pixels separately, and the other controls all red pixels and blue pixels. Therefore, the driving control circuit that controls all green pixels can output corresponding driving signals (second driving signals) to achieve multiple pixel units to increase the opening time of all green pixels separately when displaying the first frame and the Nth frame. The driving control circuit that controls all red pixels and blue pixels can output corresponding driving signals (third driving signals) to achieve multiple pixel units to increase the opening time of all red pixels and blue pixels separately when displaying the first frame and the Nth frame. The separate control of the opening time of all green pixels and the separate control of the opening time of red pixels and blue pixels is achieved. The adjustment is made more precise, and while improving the smearing phenomenon of the display panel at low brightness, the effect of improving ΔRGB can also be achieved.

[0114] In the embodiment of the present application, by controlling the duty cycle of the driving signal in different cycles, the display brightness of the first frame of the display panel is adjusted when the display panel is displaying an image. When the display panel and the display panel driving method described in the above embodiment are used to display an image, the principle of image refresh can be referred to. Fig.10 . Fig.10 This is a schematic diagram of an image refresh principle of a display panel provided in an embodiment of the present application. Fig.10 As shown, image refresh means that during the process of dragging the image displayed on the display panel, the next frame image will change relative to the previous frame image. In each display area of ​​the display panel, the changes of the next frame image compared with the previous frame image include "maintaining frame", "rising frame" and "falling frame".

[0115] When the image in one of the display areas changes to a hold frame, it means that the grayscale changes of the previous and next two frames of images in the display area remain unchanged. However, since the turn-on time of the pixels in the pixel unit is increased when displaying the first frame, the brightness of the image display will be increased. The brightness of the displayed image will also be affected by the size of the pixel charging current. Therefore, the brightness before and after the image refresh can be balanced or reduced by reducing the size of the charging current of the pixels in the pixel unit corresponding to the hold frame.

[0116] When the image in one of the display areas changes to frame drop, it means that the grayscale of the two frames of images in the display area changes to grayscale conversion (grayscale drop), but the grayscale drop does not cause the display panel to have a ghosting phenomenon. Since the turn-on time of the pixels in the pixel unit is increased when displaying the first frame, the brightness of the picture display will be increased. The brightness of the displayed picture will also be affected by the size of the pixel charging current. Therefore, the brightness before and after the image refresh can be balanced or reduced by reducing the size of the charging current of the pixels in the pixel unit corresponding to the frame drop.

[0117] For the pixels in the display units corresponding to the maintained frames and dropped frames in the display panel display screen, the pixel charging current can be reduced to reduce the brightness of the display area corresponding to the maintained frames and dropped frames in the first frame to avoid the display panel from flashing.

[0118] When the image change in one of the display areas is an ascending frame, it means that the grayscale change of the previous and next two frames of images in the display area is an ascending grayscale. In the embodiment of the present application, the first duty cycle of the driving signal is increased to increase the turn-on time of the green pixel in the display unit when displaying the first frame, so as to improve the brightness of the displayed image and avoid the occurrence of ghosting during the image refresh process. Since the turn-on time of the pixel is increased by increasing the first duty cycle of the driving signal, the brightness can also be improved when the charging current of the pixel remains unchanged. Therefore, the charging current of the pixel in the display unit corresponding to the down-shifting frame can be kept unchanged during the image refresh process, and the duty cycle of the driving signal in the corresponding period can be increased to increase the brightness of the low grayscale display area before and after the image refresh, thereby avoiding the occurrence of ghosting.

[0119] Of course, the charging current of the pixels in the display unit corresponding to the frame drop can also be appropriately increased or decreased, but it is necessary to increase the brightness of the display area corresponding to the frame drop in the first frame while increasing the turn-on time of the pixels in the display unit to avoid the occurrence of ghosting.

[0120] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

[0121] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0122] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the protection scope of the present application includes the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0123] The above is a detailed introduction to a display panel driving method and a display panel provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the transmission circuit of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0124] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for driving a display panel, characterized in that: The display panel includes a plurality of pixel units and a pixel driving circuit correspondingly connected to the plurality of pixel units, wherein the pixel units include green pixels; The display screen of the display panel includes a first frame screen, an Nth frame screen and an Mth frame screen, the Mth frame screen is a standard frame screen, N>1, M≥N, N and M are both positive integers; The pixel driving circuit controls the opening time of the pixels in the plurality of pixel units through a driving signal, wherein the driving signal includes a first period signal, an Nth period signal and an Mth period signal; The first cycle signal of the driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the first frame, and the Nth cycle signal of the driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the Nth frame; The duty cycle of the first periodic signal in the driving signal is the first duty cycle of the driving signal, the duty cycle of the Nth periodic signal in the driving signal is the Nth duty cycle of the driving signal, and the duty cycle of the Mth periodic signal in the driving signal is the standard duty cycle of the driving signal; The first duty cycle of the driving signal is greater than an Nth duty cycle of the driving signal, and the Nth duty cycle of the driving signal is greater than a standard duty cycle of the driving signal.

2. The method for driving a display panel according to claim 1, wherein: The pixel driving circuit includes a first driving circuit, and the pixel unit also includes a red pixel and a blue pixel; The driving signal includes a first driving signal, and the first driving circuit controls the opening time of pixels in the plurality of pixel units through the first driving signal; the first driving signal includes a first period signal, an Nth period signal and an Mth period signal; The first periodic signal of the first driving signal simultaneously controls the opening time of the red pixel, the green pixel and the blue pixel when the plurality of pixel units display the first frame; The Nth period signal of the first driving signal simultaneously controls the opening time of the red pixel, the green pixel and the blue pixel when the plurality of pixel units display the Nth frame of the picture; The Mth period signal of the first driving signal simultaneously controls the opening time of the red pixel, the green pixel and the blue pixel when the plurality of pixel units display the Mth frame; The duty cycle of the first periodic signal in the first drive signal is the first duty cycle of the first drive signal, the duty cycle of the Nth periodic signal in the first drive signal is the Nth duty cycle of the first drive signal, and the duty cycle of the Mth periodic signal in the first drive signal is the standard duty cycle of the first drive signal; The first duty cycle of the first driving signal is greater than an Nth duty cycle of the first driving signal, and the Nth duty cycle of the first driving signal is greater than a standard duty cycle of the first driving signal.

3. The method for driving a display panel according to claim 2, wherein: The red pixels, the green pixels and the blue pixels are arranged in a diamond arrangement to form multiple rows of pixels, the first driving circuit controls the multiple rows of pixels based on rows, and the pixels in each row are electrically connected to the first driving circuit; In any two adjacent rows of pixels, the pixels in one row are arranged in the order of "the red pixel, the green pixel, the blue pixel, the green pixel", and the pixels in the other row are arranged in the order of "the blue pixel, the green pixel, the red pixel, the green pixel".

4. The method for driving a display panel according to claim 2 or 3, characterized in that: The first duty cycle of the first driving signal is the product of the inverse of the brightness ratio of the first frame and the standard duty cycle of the first driving signal, and the Nth duty cycle of the first driving signal is the product of the inverse of the brightness ratio of the Nth frame and the standard duty cycle of the first driving signal; The first frame brightness ratio is the ratio of the brightness of the first frame to the brightness of the Mth frame, and the Nth frame brightness ratio is the ratio of the brightness of the Nth frame to the brightness of the Mth frame.

5. The method for driving a display panel according to claim 2 or 3, characterized in that: The standard duty cycle of the first driving signal is 5%-10%.

6. The method for driving a display panel according to claim 1, wherein: The pixel driving circuit includes a second driving circuit and a third driving circuit, and the pixel unit also includes a red pixel and a blue pixel; The green pixels in the plurality of pixel units are all electrically connected to the second driving circuit, and the red pixels and the blue pixels in the plurality of pixel units are all electrically connected to the third driving circuit; The driving signal includes a second driving signal and a third driving signal, the second driving circuit controls the turn-on time of the green pixel in the plurality of pixel units through the second driving signal, and the third driving circuit controls the turn-on time of the red pixel and the blue pixel in the plurality of pixel units through the third driving signal; The second driving signal and the third driving signal both include a first periodic signal, an Nth periodic signal and an Mth periodic signal; The first periodic signal of the second driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the first frame; The Nth period signal of the second driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the Nth frame image; The Mth period signal of the second driving signal controls the turn-on time of the green pixels when the plurality of pixel units display the Mth frame; The duty cycle of the first periodic signal in the second drive signal is the first duty cycle of the second drive signal, the duty cycle of the Nth periodic signal in the second drive signal is the Nth duty cycle of the second drive signal, and the duty cycle of the Mth periodic signal in the second drive signal is the standard duty cycle of the second drive signal; The first duty cycle of the second driving signal is greater than the Nth duty cycle of the second driving signal, and the Nth duty cycle of the second driving signal is greater than the standard duty cycle of the second driving signal.

7. The method for driving a display panel according to claim 6, wherein: The first period signal of the third driving signal controls the opening time of the red pixels and the blue pixels when the plurality of pixel units display the first frame; The Nth period signal of the third driving signal controls the turn-on time of the red pixels and the blue pixels when the plurality of pixel units display the Nth frame of the picture; The Mth period signal of the third driving signal controls the turn-on time of the red pixels and the blue pixels when the plurality of pixel units display the Mth frame; The duty cycle of the first periodic signal in the third driving signal is the first duty cycle of the third driving signal; the duty cycle of the Nth periodic signal in the third driving signal is the Nth duty cycle of the third driving signal, and the duty cycle of the Mth periodic signal in the third driving signal is the standard duty cycle of the third driving signal; The first duty cycle of the third driving signal is greater than an Nth duty cycle of the third driving signal, and the Nth duty cycle of the third driving signal is greater than a standard duty cycle of the third driving signal.

8. The method for driving a display panel according to claim 6 or 7, characterized in that: The red pixels, the green pixels and the blue pixels are arranged in a diamond arrangement to form a plurality of rows of pixels, wherein the plurality of rows of pixels include a green pixel row and alternating rows of red and blue pixels; The second driving circuit is electrically connected to pixels in all green pixel rows, and the third driving circuit is electrically connected to pixels in all red and blue pixel alternating rows; The pixels in the green pixel row are all green pixels, and the pixels in the red and blue pixel alternating rows are arranged according to a rule of alternating the red pixels and the blue pixels.

9. The method for driving a display panel according to claim 6 or 7, characterized in that: The first duty cycle of the second driving signal is the product of the inverse of the brightness ratio of the first frame of the green picture and the standard duty cycle of the second driving signal, and the Nth duty cycle of the second driving signal is the product of the inverse of the brightness ratio of the Nth frame of the green picture and the standard duty cycle of the second driving signal; The first duty cycle of the third driving signal is the product of the inverse of the brightness ratio of the first frame of the blue picture and the standard duty cycle of the third driving signal, and the Nth duty cycle of the third driving signal is the product of the inverse of the brightness ratio of the Nth frame of the blue picture and the standard duty cycle of the third driving signal; The green picture first frame brightness ratio is the ratio of the brightness of the first green picture frame to the brightness of the M-th green picture frame, and the green picture N-th frame brightness ratio is the ratio of the brightness of the N-th green picture frame to the brightness of the M-th green picture frame; The blue picture first frame brightness ratio is the ratio of the brightness of the first blue picture frame to the brightness of the M-th blue picture frame, and the blue picture N-th frame brightness ratio is the ratio of the brightness of the N-th blue picture frame to the brightness of the M-th blue picture frame.

10. The method for driving a display panel according to claim 9, characterized in that: The standard duty cycle of the second driving signal is 5%-10%, and the standard duty cycle of the third driving signal is 5%-10%.

11. A display panel, characterized in that: The display panel is driven by the driving method of any one of claims 1 to 10.

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