Display panel, display device and driving method of display panel

Abstract

The application relates to a display panel, a display device and a driving method of the display panel. The display panel comprises a display area and a non-display area, and further comprises: pixel circuits arranged in an array in the display area; a light-emitting driving circuit connected with the pixel circuits in the non-display area, the light-emitting driving circuit being used for generating a periodic light-emitting control signal and scanning each row of pixel circuits by using the light-emitting control signal; wherein the non-display area further comprises a blanking area, the blanking area is located on at least one side of the display area in the column direction of the pixel circuits, a target width of the blanking area is respectively related to the number of rows of the pixel circuits and the period of the light-emitting control signal, and the target width of the blanking area is used for representing the interval time of the light-emitting control signal for scanning each row of pixel circuits in two adjacent frames; wherein the width refers to the width in the column direction of the pixel circuits. The display panel has good display performance.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel, a display device, and a driving method for the display panel. Background Technology

[0002] With the continuous development of display technology, organic light-emitting diode (OLED) display panels are increasingly being used in mobile phones, computers, televisions, automotive display panels, wearable devices, and other display-enabled devices due to their advantages such as self-illumination, low driving voltage, high luminous efficiency, fast response speed, thinness, and high contrast. Currently, the display performance of these panels is relatively poor. Summary of the Invention

[0003] Therefore, it is necessary to provide a display panel, a display device, and a driving method for the display panel, with the aim of improving the display performance of the display panel.

[0004] In a first aspect, embodiments of this application provide a display panel, including a display area and a non-display area, the display panel further comprising:

[0005] Pixel circuits, located in the display area, are arranged in an array;

[0006] A light-emitting driving circuit, located in the non-display area and connected to the pixel circuit, is used to generate periodic light-emitting control signals and scan each row of pixel circuits using these signals; wherein,

[0007] The non-display area also includes a blanking area, which is located on at least one side of the display area in the column direction of the pixel circuit. The target width of the blanking area is related to the number of rows of the pixel circuit and the period of the light emission control signal. The target width of the blanking area is used to represent the interval time during which the light emission control signal scans each row of pixel circuits in two adjacent frames. The width refers to the width in the column direction of the pixel circuit.

[0008] Secondly, embodiments of this application also provide a display device, which includes the display panel provided in the first aspect.

[0009] Thirdly, embodiments of this application also provide a method for driving a display panel, the method comprising:

[0010] The light-emitting driving circuit in the display panel is controlled to generate periodic light-emitting control signals;

[0011] The light emission control signal is used to scan the pixel circuits in each row of the display area of ​​the display panel; wherein,

[0012] The display panel further includes a blanking area, which is located on one side of the display area in the column direction of the pixel circuit. The target width of the blanking area is related to the number of rows of the pixel circuit and the period of the light emission control signal. The target width of the blanking area is used to represent the interval time between the light emission control signal scanning each row of pixel circuits in two adjacent frames. The width refers to the width in the column direction of the pixel circuit.

[0013] The display panel, display device, and driving method for the display panel provided in this application include pixel circuits arranged in an array in the display area and a light-emitting driving circuit and a blanking area in the non-display area. The light-emitting driving circuit is connected to the pixel circuits and is used to generate periodic light-emitting control signals and scan each row of pixel circuits using the light-emitting control signals. The blanking area is located on at least one side of the display area in the column direction of the pixel circuits. The target width of the blanking area in the column direction of the pixel circuits is related to the number of rows of pixel circuits and the period of the light-emitting control signals, respectively. The target width of the blanking area is used to represent the interval time between the light-emitting control signals scanning each row of pixel circuits in two adjacent frames. In this application, by controlling the interval time between the light-emitting control signals scanning each row of pixel circuits in two adjacent frames to be related to the number of rows of pixel circuits and the period of the light-emitting control signals, the display performance of the display panel can be avoided due to the different states of the light-emitting control signals when entering and leaving the blanking area in each frame. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a light emission control signal entering and exiting the blanking region in a related technology.

[0015] Figure 2 This is a schematic diagram of a display panel in the related art;

[0016] Figure 3 A schematic diagram of a display panel provided in an embodiment of this application;

[0017] Figure 4 This is a schematic diagram illustrating the entry and exit of a light emission control signal into and out of the blanking region, provided in an embodiment of this application.

[0018] Figure 5 This is a schematic diagram illustrating another light emission control signal entering and exiting the blanking region, provided in an embodiment of this application.

[0019] Figure 6 A schematic diagram illustrating another instance of a light emission control signal entering and exiting the blanking region, provided in an embodiment of this application;

[0020] Figure 7 A schematic diagram illustrating the entry and exit of a light emission control signal into and out of the blanking region, as provided in an embodiment of this application;

[0021] Figure 8A circuit structure diagram of a pixel circuit provided in an embodiment of this application;

[0022] Figure 9 A schematic diagram of another display panel provided in an embodiment of this application;

[0023] Figure 10 A circuit structure diagram of another pixel circuit provided in an embodiment of this application;

[0024] Figure 11 A circuit structure diagram of another pixel circuit provided in an embodiment of this application;

[0025] Figure 12 A timing diagram of a pixel circuit provided for an embodiment of this application;

[0026] Figure 13 A circuit structure diagram of another pixel circuit provided in an embodiment of this application;

[0027] Figure 14 A schematic flowchart illustrating a driving method for a display panel provided in an embodiment of this application;

[0028] Figure 15 A flowchart illustrating another method for driving a display panel provided in an embodiment of this application;

[0029] Figure 16 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. Detailed Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] When describing positional relationships, unless otherwise specified, when an element, such as a layer, film, or substrate, is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more intermediate elements present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more intermediate elements present.

[0033] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0034] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0035] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0036] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0037] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0038] As described in the background section, the display performance of display panels in related technologies is poor. In the driving timing of related display panels, in addition to the normal display time (corresponding to the display area scanning time) during each frame scan time, a period of time is set as the front and back corridor time, which the driving circuit can adjust during. The non-display area on one side of the pixel circuit in the column direction of the display area has a blanking zone. For example, a virtual pixel circuit can be set in the non-display area. The light-emitting driving circuit not only needs to send light-emitting control signals to the pixel circuits of each row in the display area, but also needs to send light-emitting control signals to the virtual pixel circuits in the blanking zone. The time for the light-emitting driving circuit to send light-emitting control signals to the virtual pixel circuits in the non-display area is the front and back corridor time. Therefore, this front and back corridor time can be understood as the stage of the light-emitting control signal scanning the blanking zone corresponding to the virtual pixel circuit in the non-display area. Alternatively, the blanking zone can also be equivalently understood as the interval time between two adjacent frames when the light-emitting control signal scans the pixel circuits in the display area. When the light-emitting driving circuit is a multi-pulse drive, due to the existence of the blanking zone, the state of the light-emitting control signal when it enters and exits the blanking zone at the end and beginning of each frame will be different. The moment when the light emission control signal enters the blanking region can be understood as the end moment when the light emission control signal finishes scanning the pixel circuit in the display area within one frame, and the moment when the light emission control signal leaves the blanking region can be understood as the start moment when the light emission control signal begins scanning the pixel circuit in the display area within the next frame.

[0039] Please see Figure 1 , Figure 1 This diagram illustrates the states of the Emit control signal as it enters and exits the blanking region porch in related technologies. It can be seen that the Emit control signal has several different states as it enters and exits the blanking region porch. For example, the first state is when the Emit control signal enters the blanking region porch on the falling edge; the second state is when the Emit control signal remains at a low level throughout the blanking region porch; the third state is when the Emit control signal remains at a high level throughout the blanking region porch; and the fourth state is when the Emit control signal enters the blanking region porch on the rising edge.

[0040] The different states of the Emit control signal when entering and exiting the blanking porch can cause bright and dark horizontal stripes to appear on the display panel. For example, the light-emitting driving circuit can be connected to a first power signal line and a second power signal line. The first power signal line can provide a high-level signal VGH to the light-emitting driving circuit, and the second power signal line can provide a low-level signal VGL to the light-emitting driving circuit. Assuming that the falling edge of the Emit control signal enters the blanking porch at the end of the first frame, since there are no actual pixel circuits in the blanking porch, the load on the second power signal line is small at this time. Assuming that the Emit control signal remains high in the blanking porch at the end of the second frame, it means that the falling edge of the Emit control signal has not entered the blanking porch, and the load on the second power signal line is large at this time. Furthermore, since the light-emitting control signal is used to drive the pixel... Other driving circuits in the pixel circuit (e.g., the driving circuit for the bias transistor in the pixel circuit, the driving circuit for the reset transistor in the pixel circuit that resets the anode of the light-emitting element) reuse the first power signal line and the second power signal line. The state of the light emission control signal Emit when entering and exiting the blanking region porch will cause differences in the magnitude of the high-level signal VGH on the first power signal line and / or the low-level signal VGL on the second power signal line at the end and beginning of different frames. This causes the high-level signal VGH and / or the low-level signal VGL to change periodically according to the period of the light emission control signal Emit, which in turn causes periodic differences in the scan signals received by the bias adjustment transistor and / or the first reset transistor, resulting in a phenomenon such as... Figure 2 As shown, the bright and dark horizontal stripes that are periodically related to the Emit light emission control signal result in a poor display effect on the display panel.

[0041] Based on the aforementioned technical problems, the inventors discovered that by designing the target width of the blanking region according to the number of rows of the pixel circuits and the period of the light emission control signal, the bright and dark horizontal lines in the display panel display process can be shortened or eliminated, thereby improving the display effect of the display panel. Based on this, the inventors further developed the technical solution of the embodiments of this application. Specifically, the display panel provided in the embodiments of this application includes a display area and a non-display area. The display panel also includes pixel circuits located in the display area and arranged in an array; a light emission driving circuit located in the non-display area and connected to the pixel circuits. The light emission driving circuit is used to generate periodic light emission control signals and scan each row of pixel circuits using the light emission control signals. The non-display area also includes a blanking region located on at least one side of the display area in the column direction of the pixel circuits. The target width of the blanking region is related to the number of rows of the pixel circuits and the period of the light emission control signal, respectively. The target width of the blanking region is used to represent the interval time between the light emission control signal scanning each row of pixel circuits in two adjacent frames. The width refers to the width in the column direction of the pixel circuits. By adopting the above technical solution, the target width of the blanking area can be adjusted according to the number of rows of the pixel circuit and the period of the light emission control signal, thereby reducing or eliminating the bright and dark horizontal stripes related to the period of the light emission control signal in the display panel and improving the display effect of the display panel.

[0042] The above is the core idea of ​​this application. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0043] In one embodiment, see Figure 3 This application provides a display panel, which includes a display area AA and a non-display area FA. The display panel also includes a pixel circuit 10 and a light-emitting driving circuit 20.

[0044] The pixel circuit 10 is located in the display area AA, and the pixel circuit 10 is arranged in an array.

[0045] The light-emitting driving circuit 20 is located in the non-display area FA and is connected to the pixel circuit 10. The light-emitting driving circuit generates periodic light-emitting control signals and uses these signals to scan each row of pixel circuits 10. For example, the light-emitting driving circuit 20 is located on at least one side of the pixel circuit 10 in the row direction. For example, the light-emitting driving circuit 20 is connected to each row of pixel circuits 10 respectively, providing light-emitting control signals to each row of pixel circuits 10.

[0046] The non-display area FA also includes a blanking region 30, which is located on at least one side of the display area AA in the column direction of the pixel circuit 10. For example, the blanking region 30 is located on the first side of the display area AA in the column direction of the pixel circuit 10, such as... Figure 3 The blanking area 30 is located on the lower side of the display area AA shown. In another example, the blanking area 30 is located on the second side of the display area AA in the direction of the 10 columns of pixel circuits. In yet another example, the blanking area 30 is located on the first and second sides of the display area AA in the direction of the 10 columns of pixel circuits, wherein the first and second sides are two sides opposite to each other in the direction of the 10 columns of pixel circuits. In applications, the position of the blanking area 10 can be set according to the actual display scenario, and is not limited here.

[0047] The target width of the blanking region 30 is related to the number of rows of the pixel circuit 10 and the period of the emission control signal. The target width of the blanking region 30 varies with at least one of the number of rows of the pixel circuit 10 and the period of the emission control signal. The target width of the blanking region 30 represents the interval between scans of each row of pixel circuit 10 by the emission control signal in two adjacent frames, where the width refers to the width in the column direction of the pixel circuit. It should be noted that the blanking region 30 is not an actual physical area, but a human-defined concept.

[0048] In application, when the scanning time of one frame ends, the next frame is not started immediately. There is a certain interval between two adjacent frames. This interval can be understood as follows: The display area AA has a blanking area 30 on one side of the pixel circuit 10 in the column direction. Virtual pixel circuits can be set in the blanking area 30. After scanning the actual pixel circuit 10 in the display area AA, the light-emitting driving circuit 20 still needs to scan the virtual pixel circuits in the blanking area 30 before entering the next frame to start scanning the pixel circuits in the display area AA. The time for the light-emitting driving circuit 20 to scan the virtual pixel circuits in the non-display area FA is the interval between two adjacent frames. This interval can also be equivalently understood as the width of the blanking area 30 in the column direction of the pixel circuit. Or, in other words, the physical length scanned by the light-emitting control signal in the column direction of the pixel circuit 10 during this interval is the width of the blanking area 30 in the column direction of the pixel circuit 10.

[0049] Due to the presence of the blanking region 30, the state of the light-emitting control signal may differ when it enters and exits the blanking region 30 at the end and beginning of each frame. This causes the load on the power line providing high-level and low-level signals to the light-emitting drive circuit 20 to vary at different times, which in turn causes the scan signals received by other drive units connected to the power line to vary at different times, resulting in bright and dark horizontal lines appearing on the display panel. This application addresses this by linking the target width of the blanking region 30 to the number of rows of the pixel circuit 10 and the period of the light-emitting control signal. By adjusting and determining the target width of the blanking region 30 according to the number of rows of the pixel circuit 10 and / or the period of the light-emitting control signal, the bright and dark horizontal lines on the display panel can be reduced or even eliminated to a certain extent. In other words, by designing the target width of the blanking region 30, the purpose of shortening or eliminating the bright and dark horizontal lines during the display process can be achieved. For example, the target width of the blanking region 30 can be set according to the number of rows of the pixel circuit 10 and the period of the light-emitting control signal to shorten the width of the bright and dark horizontal lines, making them invisible. Furthermore, the target width of the blanking area 30 can be set according to the number of rows of the pixel circuit 10 and the period of the light emission control signal to eliminate bright and dark horizontal stripes. That is, by controlling the target width of the blanking area 30 through the period of the light emission control signal, i.e., the interval time between two adjacent frames, and controlling the level state of the light emission control signal to be the same at the beginning and end of each frame, the bright and dark horizontal stripes on the display panel can be eliminated. For details, please refer to the relevant content of the following embodiments.

[0050] The display panel provided in this application includes pixel circuits arranged in an array in the display area and a light-emitting driving circuit and a blanking area in the non-display area. The light-emitting driving circuit is connected to the pixel circuits and is used to generate periodic light-emitting control signals and scan each row of pixel circuits using the light-emitting control signals. The blanking area is located on at least one side of the display area in the column direction of the pixel circuits. The target width of the blanking area in the column direction of the pixel circuits is related to the number of rows of pixel circuits and the period of the light-emitting control signals, respectively. The target width of the blanking area is used to represent the interval time between the light-emitting control signals scanning each row of pixel circuits in two adjacent frames. In this application, by controlling the interval time between the light-emitting control signals scanning each row of pixel circuits in two adjacent frames to be related to the number of rows of pixel circuits and the period of the light-emitting control signals, the display performance of the display panel can be avoided due to the different states of the light-emitting control signals when entering the blanking area in each frame.

[0051] In one embodiment, the target width is positively correlated with the first width, and the correlation coefficient between the target width and the first width is a positive integer. The first width is the width of the pixel circuit that can be scanned in one cycle of the light emission control signal.

[0052] In this embodiment, in order to eliminate horizontal lines in the display panel, the target width of the blanking region 30 can be determined according to the width of the pixel circuit that can be scanned in one cycle of the light emission control signal EM, so that the target width is positively correlated with the width of the pixel circuit that can be scanned in one cycle of the light emission control signal EM.

[0053] For example, assuming the target width of the blanking region 30 is n, and the width of the pixel circuit that can be scanned in one cycle of the luminous emission control signal is T, then n = kT + a, where k is the correlation coefficient between the target width and the first width, and a is the fringe parameter. The target width is positively correlated with the width of the pixel circuit that can be scanned in one cycle of the luminous emission control signal EM, meaning k ≥ 1.

[0054] Another example is that the target width can be proportional to the width of the pixel circuit that can be scanned in one cycle of the light-emitting control signal. This is achieved by making the target width of the blanking region 30 exactly an integer multiple of the width of the pixel circuit that can be scanned in one cycle of the light-emitting control signal, i.e., a=0, n=kT, k≥1 and k is a positive integer. In other words, the target width of the blanking region 30 is equal to the width of one or more complete cycles of the light-emitting control signal. In this case, the state of the light-emitting control signal entering and exiting the blanking region 30 is the same at different times. Therefore, the load on the first power line and / or the second power line is the same at different times, avoiding the problem of power line load differences at different times caused by the light-emitting control signal entering and exiting the blanking region 30. This solves the problem of horizontal stripes caused by the non-periodic change of high-level and low-level signals, thereby improving the display effect. Please refer to [link to relevant documentation]. Figures 4 to 7 Taking the target width of the blanking region 30 as being exactly equal to the width of the pixel circuit that can be scanned in one cycle of the light emission control signal, i.e. when k=1, a=0, and n=T, it can be seen that the level state of the light emission control signal entering and leaving the blanking region 30 is the same, thus eliminating horizontal stripes.

[0055] In one embodiment, within the same frame, the level state of the light emission control signal at the start of scanning the pixel circuit is the same as the level state of the light emission control signal at the end of scanning the pixel circuit. That is, within the same frame, the level state of the light emission control signal at the start of scanning the pixel circuit and the level state of the light emission control signal at the end of scanning the pixel circuit are respectively target states. The target states include a high-level state, a low-level state, a high-level transition to a low-level state, or a low-level transition to a high-level state.

[0056] By setting the target width of the blanking region 30 to be an integer multiple of the period of the light emission control signal EM, that is, k is a positive integer, for example, k can be 1, 2, 3 or other integers greater than or equal to 1, and a=0, in this case, the level state of the light emission control signal EM at the end of each frame, that is, when the light emission control signal EM enters the blanking region 30, is the same as the level state of the light emission control signal EM at the beginning of the next frame, that is, when the light emission control signal EM leaves the blanking region 30. Furthermore, the level state of the light emission control signal EM at the beginning of each frame scanning pixel circuit is the same as the level state of the light emission control signal EM at the end of each frame scanning pixel circuit. Therefore, it will not cause load changes on the first power signal line and / or the second power signal line, and thus will not cause bright and dark horizontal stripes to appear on the display panel.

[0057] For example, with k=1 and a=0, in this case: for example, as Figure 4 As shown, the state of the light emission control signal EM at the end and start of each frame can both be a low-level transition to a high-level state, i.e., a rising edge state. Therefore, the level state of the light emission control signal EM at the start of scanning the pixel circuit and the level state of the light emission control signal EM at the end of scanning the pixel circuit in each frame are both low-level transitions to high-level states; for example, as... Figure 5 As shown, the state of the light emission control signal EM at the end and start of each frame is high, and therefore the level state of the light emission control signal EM at the start of scanning the pixel circuit and the level state of the light emission control signal EM at the end of scanning the pixel circuit are both high; for example, Figure 6 As shown, the state of the light emission control signal EM at the end and start of each frame transitions from a high level to a low level. Consequently, the level state of the light emission control signal EM at the start and end of the pixel scanning circuit in each frame also transitions from a high level to a low level. For example, ... Figure 7 As shown, the state of the light emission control signal EM at the end and start of each frame is low. Consequently, the level state of the light emission control signal EM at the start of scanning the pixel circuit and the level state of the light emission control signal EM at the end of scanning the pixel circuit are both low. This ensures that the level state of the light emission control signal at the start of scanning the pixel circuit and the level state of the light emission control signal at the end of scanning the pixel circuit are the same within the same frame. Therefore, it will not cause load changes on the first power signal line and / or the second power signal line, thus preventing the appearance of bright and dark horizontal stripes on the display panel and improving the display performance of the display panel.

[0058] In one embodiment, the width of the abnormal horizontal stripes generated by the light emission control signal does not exceed a preset width threshold. The abnormal horizontal stripe width is related to the target width and is the difference between the target width and the product of the first width and a correlation coefficient. Assuming the abnormal horizontal stripe width is D, then D = nT*k ≤ preset width threshold, where n is the target width, T is the first width, and k is the correlation coefficient between the target width and the first width.

[0059] In applications, a preset width threshold is predefined to define the width of abnormal horizontal lines. For example, the preset width threshold can be less than or equal to the minimum discernible width of the human eye. Based on this, if the width of the abnormal horizontal lines generated by the light emission control signal does not exceed the preset width threshold, the impact of the abnormal horizontal lines on the display panel is small, to the point that they are invisible to the human eye, thereby improving the display effect of the display panel.

[0060] In an exemplary embodiment, the target width satisfies: n-[n / T]*T≤[L0 / h], or n-[n / T]*T≥T-[L0 / h], where L0 represents a preset width threshold, h represents the width of the pixel circuit in the column direction, n represents the number of rows of the target width equivalent pixel circuit, T represents the first width, and [ ] represents rounding down.

[0061] In this embodiment, [L0 / h] represents the number of rows of the equivalent pixel circuit of the preset width threshold, and n-[n / T]*T represents the number of rows of the equivalent pixel circuit of the horizontal stripe width. The preset width threshold is used to indicate the minimum recognizable width by the human eye. Therefore, as long as the number of rows of the equivalent pixel circuit of the horizontal stripe width is less than or equal to the number of rows of the equivalent pixel circuit of the preset width threshold, or the number of rows of the equivalent pixel circuit of the horizontal stripe width is greater than or equal to the difference between the first width and the number of rows of the equivalent pixel circuit of the preset width threshold, the horizontal stripe can be made invisible, thereby improving the display effect of the display panel.

[0062] In an exemplary embodiment, the target width satisfies the following condition: n≤[L0 / h]+[n*m / (N+n)]*(N+n) / m, or n≥[n*m / (N+n)]*(N+n) / m+(N+n) / m -[L0 / h]; where m represents the number of pulses of the light emission control signal in one frame, that is, m represents the number of effective pulses of the light emission control signal in one frame; N represents the number of rows of pixel circuits, that is, N represents the number of rows of pixel circuits in the display area AA.

[0063] It can be understood that the first width T can be equivalent to the sum of the actual number of pixel circuits N in the display area and the number of virtual pixel circuits n in the blanking area divided by the number of pulses m of the light emission control signal in one frame, i.e., T=(N+n) / m. Substituting T=(N+n) / m into n-[n / T]*T≤[L0 / h] and n-[n / T]*T≥T-[L0 / h] respectively, we can obtain n≤[L0 / h]+[n*m / (N+n)]*(N+n) / m and n≥[n*m / (N+n)]*(N+n) / m+(N+n) / m-[L0 / h]. In applications, since the number of pulses m of the light emission control signal in one frame, the number of rows N of the pixel circuit, the width h of the pixel circuit in the column direction, and the preset width threshold L0 are all known parameters, the width range of the target width n can be calculated by substituting these known parameters into the above inequality. Selecting a value from the width range as the target width n will make the preset width threshold less than or equal to the minimum recognizable width of the human eye, or make the number of rows of the equivalent pixel circuit of the horizontal stripe width greater than or equal to the difference between the first width and the number of rows of the equivalent pixel circuit of the preset width threshold. Thus, the human eye cannot observe the abnormal horizontal stripe, reducing the impact of the abnormal horizontal stripe width on the display panel and improving the display effect of the display panel.

[0064] In one exemplary embodiment, the display panel includes a first light-emitting control mode and a second light-emitting control mode, wherein the light-emitting driving circuit 20 generates a first light-emitting control signal in the first light-emitting control mode and generates a second light-emitting control signal in the second light-emitting control mode; wherein the period of the first light-emitting control signal is greater than the period of the second light-emitting control signal. The first target width of the first blanking area of ​​the display panel in the first light-emitting control mode is greater than the second target width of the second blanking area of ​​the display panel in the second light-emitting control mode.

[0065] It is understood that a display panel can have multiple light-emitting modes. In different light-emitting modes, the light-emitting driving circuit outputs different light-emitting control signals to the pixel circuit, thus enabling the display panel to have multiple refresh rates. For example, the display panel has a first light-emitting control mode and a second light-emitting control mode. In the first light-emitting control mode, the light-emitting driving circuit outputs a first light-emitting control signal to the pixel circuit, and the refresh rate of the display panel is the first refresh rate. In the second light-emitting control mode, the light-emitting driving circuit outputs a second light-emitting control signal to the pixel circuit, and the refresh rate of the display panel is the second refresh rate. The periods of the first light-emitting control signal and the second light-emitting control signal are different.

[0066] When the period of the light emission control signal is different, the target width of the corresponding blanking area is also different. Assuming that the target width of different blanking areas is proportional to the width of the pixel circuit that can be scanned in one cycle of the corresponding light emission control signal, the longer the period of the light emission control signal, the larger the target width of the corresponding blanking area. When the display panel switches between different light emission control modes, the width of the blanking area can be switched to the target width of the blanking area corresponding to the light emission control signal to eliminate or reduce horizontal lines. For example, the period of the first light emission control signal is longer than the period of the second light emission control signal. The first target width of the first blanking area of ​​the display panel in the first light emission control mode is greater than the second target width of the second blanking area of ​​the display panel in the second light emission control mode. When the display panel switches from the first refresh rate to the second refresh rate, the blanking area is set to switch from the first blanking area with the first target width to the second blanking area with the second target width. When the display panel switches from the second refresh rate to the first refresh rate, the blanking area is set to switch from the second blanking area with the second target width to the first blanking area with the first target width, so that the display panel has good display performance regardless of the refresh rate.

[0067] In one exemplary embodiment, please refer to Figure 8 The pixel circuit includes a driving transistor T1, a first light-emitting control module 11, and a second light-emitting control module 12. The first terminal of the driving transistor T1 is connected to the second terminal of the first light-emitting control module, and the second terminal of the driving transistor T1 is connected to the first terminal of the second light-emitting control module. The first terminal of the first light-emitting control module 11 receives a first level signal PVDD, and its control terminal is connected to the output terminal of the light-emitting driving circuit 20 to receive a light-emitting control signal EM. The second terminal of the second light-emitting control module 12 is connected to the anode of the light-emitting device D, and its control terminal is connected to the output terminal of the light-emitting driving circuit 20 to receive the light-emitting control signal EM.

[0068] The first light-emitting control module 11 includes a first light-emitting control transistor T2, and the second light-emitting control module 12 includes a second light-emitting control transistor T3. The first terminal of the first light-emitting control transistor T2 is used to receive a first power supply signal PVDD, the second terminal of the first light-emitting control transistor T2 is connected to the first terminal of the driving transistor T1, and the gate of the first light-emitting control transistor T2 is used to receive a light-emitting control signal EM. The first terminal of the second light-emitting control transistor T3 is connected to the second terminal of the driving transistor T1, the second terminal of the second light-emitting control transistor T3 is connected to the first terminal of the light-emitting device D, and the gate of the second light-emitting control transistor T3 is used to receive the light-emitting control signal EM.

[0069] The pixel circuit includes a light-emitting stage, where a light-emitting control signal EM can be used to control the light-emitting element D to emit light. During the light-emitting stage, both the first light-emitting control transistor T2 and the second light-emitting control transistor T3 are turned on in response to the light-emitting control signal EM, driving the transistors to generate a driving current under gate voltage control, and providing this driving current to the light-emitting device D during this stage. When both the first light-emitting control transistor T2 and the second light-emitting control transistor T3 are turned off in response to the light-emitting control signal EM, the driving transistors stop providing driving current to the light-emitting device D.

[0070] In one exemplary embodiment, please refer to Figure 9 and Figure 10 The light-emitting driving circuit 20 includes a first light-emitting driving circuit 21 and a second light-emitting driving circuit 22. The first light-emitting driving circuit 21 generates a third light-emitting control signal EM3, and the second light-emitting driving circuit 22 generates a fourth light-emitting control signal EM4. The period of the third light-emitting control signal EM3 is different from the period of the fourth light-emitting control signal. The control terminal of the first light-emitting control module 11 is connected to the output terminal of the first light-emitting driving circuit and is used to receive the third light-emitting control signal EM3. The control terminal of the second light-emitting control module 12 is connected to the output terminal of the second light-emitting driving circuit 22 and is used to receive the fourth light-emitting control signal EM4. The target width is related to the period of the third light-emitting control signal EM3 and the period of the fourth light-emitting control signal EM4, respectively.

[0071] In applications, the period frequencies of the light emission control signals received by the first light emission control module 11 and the second light emission control module 12 may be different. In this case, it is necessary to determine the range of the first target width n1 based on the period of the third light emission control signal EM3, and the range of the second target width n2 based on the period of the fourth light emission control signal EM4. Then, the target width of the blanking region is determined based on the intersection of the two. For example, assuming the number of pixel rows is 2000, the pixel height is 50um, the number of pulses m1 of EM3 is set to 36, the number of pulses m2 of EM4 is 64, and the value of L0 is usually 0.2mm, [L0 / h]=4. According to [n*m / (N+n)]*(N+n) / m+(N+n) / m-[L0 / h]≤n≤[L0 / h]+[n*m / (N+n)]*(N+n) / m.

[0072] Then we have: [n1*m1 / (N+n1)]*(N+n1) / m1+(N+n1) / m1-[L0 / h]≤n1≤[L0 / h]+[n1*m1 / (N+n1)]*(N+n1) / m1, and [n2*m2 / (N+n2)]*(N+n2) / m2+(N+n2) / m2-[L0 / h]≤n2≤[L0 / h]+[n2*m / (N+n2)]*(N+n2) / m2.

[0073] That is: [n1*36 / (2000+n1)]*(2000+n1) / 36+(2000+n1) / 36-4≤n1≤4+[n1*36 / (2000+n1)]*(2000+n1) / 36, and [n2*64 / (2000+n2)]*(2000+n2) / 64+(2000+n2) / 64-4≤n2≤4+[n2*64 / (2000+n2)]*(2000+n2) / 64.

[0074] The target width of the blanking area can be determined by combining the above two inequalities. It can be understood that the target width of the blanking area determined in this way can make the horizontal lines in the display panel invisible under the third light emission control signal EM3 and the fourth light emission control signal EM4.

[0075] In one exemplary embodiment, such as Figure 11 As shown, the pixel circuit further includes a bias reset module 13 and a first initialization module 14. The first terminal of the bias reset module 13 is connected to the first terminal of the driving transistor T1 and the second terminal of the first light-emitting control module 11, respectively. The second terminal of the bias reset module 13 is used to receive a bias reset signal DVH, and the control terminal of the bias reset module 13 is used to receive a first scan signal SPX. The first terminal of the first initialization module 14 is used to receive a first initialization signal Vref1, and the second terminal of the first initialization module 14 is connected to the second terminal of the second light-emitting control module 12 and the anode of the light-emitting device D, respectively. The control terminal of the first initialization module is used to receive the first scan signal SPX.

[0076] Please see Figure 12 The bias reset module 13 and the first initialization module 14 respond to the first time period t1 when the first scan signal SPX is turned on, and the first light emission control module 11 and the second light emission control module 12 respond to the second time period t2 when the light emission control signal EM is turned off.

[0077] Specifically, the bias reset module 13 includes a bias reset transistor T4. The first terminal of the bias reset transistor T4 is connected to the first terminal of the driving transistor T1 and the second terminal of the first light-emitting control transistor T2, respectively. The second terminal of the bias reset transistor T4 is used to receive the bias reset signal DVH, and the gate of the bias reset transistor T4 is used to receive the first scan signal SPX. The first initialization module 14 includes a first initialization transistor T5. The first terminal of the first initialization transistor T5 is used to receive the first initialization signal Vref1, and the second terminal of the first initialization transistor T5 is connected to the second terminal of the second light-emitting control module 12 and the anode of the light-emitting device D, respectively. The gate of the first initialization transistor T5 is used to receive the first scan signal SPX. During the second time period when the first light-emitting control module 11 and the second light-emitting control module 12 are respectively disconnected by the light-emitting control signal EM, the bias reset transistor T4 and the first initialization transistor T5 are turned on in response to the first scan signal SPX to bias reset the first terminal and / or gate of the driving transistor T1 and initialize the anode of the light-emitting device D.

[0078] In one exemplary embodiment, such as Figure 13 As shown, the pixel circuit also includes a data writing module 15, a threshold compensation module 16, and a second initialization module 17. The first terminal of the data writing module 15 is used to receive a data signal Vdata, and the second terminal of the data writing module 15 is connected to the first terminal of the driving transistor T1. The control terminal of the data writing module 15 is used to receive a second scan signal SP. The first terminal of the threshold compensation module 16 is connected to the second terminal of the driving transistor T1, and the second terminal of the threshold compensation module 16 is connected to the gate of the driving transistor T0. The control terminal of the threshold compensation module 16 is used to receive a third scan signal S2N. The first terminal of the second initialization module 17 is connected to the second terminal of the threshold compensation module 16 and the gate of the driving transistor T1. The second terminal of the second initialization module 17 is used to receive a second initialization signal Vref2, and the control terminal of the second initialization module 17 is used to receive a fourth scan signal S1N.

[0079] Specifically, the data writing module 15 includes a data writing transistor T6. The first terminal of the data writing transistor T6 is used to receive the data signal Vdata. The second terminal of the data writing transistor T6 is connected to the first terminal of the driving transistor T1. The gate of the data writing transistor T6 is used to receive the second scan signal SP. The threshold compensation module 16 includes a threshold compensation transistor T7. The first terminal of the threshold compensation transistor T7 is connected to the second terminal of the driving transistor T1. The second terminal of the threshold compensation transistor T7 is connected to the gate of the driving transistor T0. The gate of the threshold compensation transistor T7 is used to receive the third scan signal S2N. The second initialization module 17 includes a second initialization transistor T8. The first terminal of the second initialization transistor T8 is connected to the second terminal of the threshold compensation transistor T7 and the gate of the driving transistor T1. The second terminal of the second initialization transistor T8 is used to receive the second initialization signal Vref2. The gate of the second initialization transistor T8 is used to receive the fourth scan signal S1N.

[0080] Based on the same inventive concept, please refer to Figure 14 This application also provides a method for driving a display panel, the method including steps S1401 and S1402.

[0081] S1401: Controls the light-emitting drive circuit in the display panel to generate periodic light-emitting control signals.

[0082] The display panel also includes a blanking area located on one side of the display area in the column direction of the pixel circuits. The target width of the blanking area is related to the number of rows of the pixel circuits and the period of the light emission control signal. The target width of the blanking area represents the interval between the light emission control signal scanning each row of pixel circuits in two adjacent frames; where the width refers to the width in the column direction of the pixel circuits. The display panel can be the display panel provided in the aforementioned embodiments, and a detailed description can be found in the aforementioned related content, which will not be repeated here. A detailed description of the blanking area can also be found in the aforementioned related content, which will not be repeated here.

[0083] S1402: Uses light emission control signals to scan the pixel circuits in each row of the display area of ​​the display panel.

[0084] In this application, the target width of the blanking area is determined by combining the period of the light emission control signal and the number of rows of pixel circuits. This allows the light emission control signal to scan each row of pixel circuits in the display area of ​​the display panel, thereby reducing or even eliminating the bright and dark horizontal stripes on the display panel to a certain extent. For example, the target width of the blanking area can be determined by combining the period of the light emission control signal and the number of rows of pixel circuits to reduce the width of the horizontal stripes or completely eliminate them. Thus, when the light emission control signal scans each row of pixel circuits in the display area, there are no horizontal stripes or the horizontal stripes are not visible in the display panel.

[0085] In one exemplary embodiment, please refer to Figure 15 The display panel includes a first light emission control mode and a second light emission control mode. The method also includes steps S1501 and S1502.

[0086] S1501: Switch the light-emitting driving circuit to the target light-emitting control mode, which includes either the first light-emitting control mode or the second light-emitting control mode.

[0087] It is understandable that display panels can have multiple refresh rates. At different refresh rates, the period of the light emission control signal is different, and the target width of the corresponding blanking area is also different.

[0088] S1502: Adjust the target width according to the target illumination control signal corresponding to the target illumination control mode.

[0089] For example, in the first light emission control mode, the first light emission control signal corresponds to the first blanking region, which has a first target width; in the second light emission control mode, the second light emission control signal corresponds to the second blanking region, which has a second target width. When the display panel is in the first light emission control mode, the width of the blanking region is adjusted to the first target width; when the display panel is in the second light emission control mode, the width of the blanking region is adjusted to the second target width, so that the display panel has good display performance regardless of the light emission control mode.

[0090] Based on the same concept, this application also provides a display device. Figure 16 This is a schematic diagram of the structure of the display device 200 provided in the embodiments of this application, as shown below. Figure 16 As shown, the display device 200 includes the display panel 100 in any of the above embodiments. Exemplarily, as... Figure 16 As shown, the display device 200 includes a display panel 100. Therefore, the display device 200 also has the beneficial effects of the display panel 100 in the above embodiments. The similarities can be understood with reference to the explanation of the display panel 100 above, and will not be repeated below.

[0091] The display device 200 provided in this application embodiment can be a Figure 16 The mobile phone shown can also be any electronic product with display function, including but not limited to the following categories: television, laptop, desktop monitor, tablet, digital camera, smart bracelet, smart glasses, vehicle display, industrial control equipment, medical display, touch interactive terminal, etc. This application embodiment does not make any special limitation in this regard.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display panel, characterized in that, The display panel includes a display area and a non-display area, and further includes: Pixel circuits, located in the display area, are arranged in an array; A light-emitting driving circuit, located in the non-display area and connected to the pixel circuit, is used to generate periodic light-emitting control signals and scan each row of pixel circuits using these signals; wherein, The non-display area also includes a blanking area, which is located on at least one side of the display area in the column direction of the pixel circuit. The target width of the blanking area is related to the number of rows of the pixel circuit and the period of the light emission control signal. The target width of the blanking area is used to represent the interval time between the light emission control signal scanning each row of pixel circuits in two adjacent frames. The width refers to the width in the column direction of the pixel circuit. The width of the abnormal horizontal lines generated by the light emission control signal does not exceed a preset width threshold; wherein, the width of the abnormal horizontal lines is related to the target width; the width of the abnormal horizontal lines is the difference between the target width and the product of a first width and a correlation coefficient; the first width is the width of a pixel circuit that can be scanned in one cycle of the light emission control signal; the correlation coefficient is the correlation coefficient between the target width and the first width.

2. The display panel according to claim 1, characterized in that, The target width is positively correlated with the first width, and the correlation coefficient between the target width and the first width is a positive integer.

3. The display panel according to claim 2, characterized in that, The target width is proportional to the first width.

4. The display panel according to claim 1, characterized in that, Within the same frame, the level state of the pixel circuit at the start of the light emission control signal scanning is the same as the level state of the pixel circuit at the end of the light emission control signal scanning.

5. The display panel according to claim 1, characterized in that, In the same frame, the start of the light emission control signal scanning the level state of the pixel circuit and the end of the light emission control signal scanning the level state of the pixel circuit are respectively target states. The target states include high level state, low level state, high level to low level state, or low level to high level state.

6. The display panel according to claim 1, characterized in that, The target width satisfies: n-[n / T]*T≤[L0 / h], or n-[n / T]*T≥T-[L0 / h], where L0 represents a preset width threshold, h represents the width of the pixel circuit in the column direction, n represents the number of rows of the pixel circuit equivalent to the target width, T represents the first width, and [ ] represents rounding down.

7. The display panel according to claim 6, characterized in that, The target width satisfies the following conditions: n≤[L0 / h]+[n*m / (N+n)]*(N+n) / m, or n≥[n*m / (N+n)]*(N+n) / m+(N+n) / m -[L0 / h]; where m represents the number of pulses of the light emission control signal in one frame, and N represents the number of rows of the pixel circuit.

8. The display panel according to claim 1, characterized in that, The display panel includes a first light-emitting control mode and a second light-emitting control mode, wherein... The light-emitting driving circuit generates a first light-emitting control signal in the first light-emitting control mode and a second light-emitting control signal in the second light-emitting control mode; wherein the period of the first light-emitting control signal is greater than the period of the second light-emitting control signal. The first target width of the first blanking area of ​​the display panel in the first light emission control mode is greater than the second target width of the second blanking area of ​​the display panel in the second light emission control mode.

9. The display panel according to claim 1, characterized in that, The pixel circuit includes a driving transistor, a first light-emitting control module, and a second light-emitting control module, wherein... The first terminal of the driving transistor is connected to the second terminal of the first light-emitting control module, and the second terminal of the driving transistor is connected to the first terminal of the second light-emitting control module. The first terminal of the first light-emitting control module is used to receive a first level signal, and the control terminal of the first light-emitting control module is connected to the output terminal of the light-emitting driving circuit. The second terminal of the second light-emitting control module is connected to the anode of the light-emitting device, and the control terminal of the second light-emitting control module is connected to the output terminal of the light-emitting driving circuit.

10. The display panel according to claim 9, characterized in that, The light-emitting driving circuit includes a first light-emitting driving circuit and a second light-emitting driving circuit. The first light-emitting driving circuit generates a third light-emitting control signal, and the second light-emitting driving circuit generates a fourth light-emitting control signal. The period of the third light-emitting control signal is different from the period of the fourth light-emitting control signal. The control terminal of the first light-emitting control module is connected to the output terminal of the first light-emitting driving circuit; The control terminal of the second light-emitting control module is connected to the output terminal of the second light-emitting driving circuit; The target width is related to the period of the third light emission control signal and the period of the fourth light emission control signal, respectively.

11. The display panel according to claim 9, characterized in that, The pixel circuit further includes: a bias reset module and a first initialization module, wherein... The first terminal of the bias reset module is connected to the first electrode of the driving transistor and the second terminal of the first light-emitting control module, respectively. The second terminal of the bias reset module is used to receive the bias reset signal, and the control terminal of the bias reset module is used to receive the first scan signal. The first terminal of the first initialization module is used to receive a first initialization signal, the second terminal of the first initialization module is connected to the second terminal of the second light emission control module and the anode of the light emission device, and the control terminal of the first initialization module is used to receive a first scan signal. The bias reset module and the first initialization module respond to the first time period when the first scan signal is turned on, and the first light emission control module and the second light emission control module respond to the second time period when the light emission control signal is turned off.

12. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 11.

13. A driving method for a display panel, characterized in that, The method includes: The light-emitting driving circuit in the display panel is controlled to generate periodic light-emitting control signals; The light emission control signal is used to scan the pixel circuits in each row of the display area of ​​the display panel; wherein, The display panel further includes a blanking area located on one side of the display area in the column direction of the pixel circuit. The target width of the blanking area is related to the number of rows of the pixel circuit and the period of the light emission control signal. The target width of the blanking area represents the interval between the light emission control signal scanning each row of pixel circuits in two adjacent frames. The width refers to the width in the column direction of the pixel circuit. The width of the abnormal horizontal lines generated by the light emission control signal does not exceed a preset width threshold. The width of the abnormal horizontal lines is related to the target width. The abnormal horizontal line width is the difference between the target width and the product of a first width and a correlation coefficient. The first width is the width of the pixel circuit that can be scanned in one period of the light emission control signal. The correlation coefficient is the correlation coefficient between the target width and the first width.

14. The driving method for a display panel according to claim 13, characterized in that, The display panel includes a first light-emitting control mode and a second light-emitting control mode, and the method further includes: Switch the light-emitting driving circuit to the target light-emitting control mode, wherein the target light-emitting control mode includes the first light-emitting control mode or the second light-emitting control mode; The target width is adjusted according to the target light emission control signal corresponding to the target light emission control mode.

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