Display panel, display device and driving method of display panel

Abstract

The invention 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 the display panel further comprises pixel circuits located in the display area and arranged in an array; the light-emitting driving circuit is located in the non-display area and connected with the pixel circuits, and the light-emitting driving circuit is used for generating periodic light-emitting control signals and scanning the pixel circuits in each row through the light-emitting control signals; the non-display area further comprises a blanking area, the blanking area is located on at least one side, in the column direction of the pixel circuit, of the display area, and the target width of the blanking area is related to the row number of the pixel circuit and the period of the light-emitting control signal. 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 circuit. The display panel provided by the invention has relatively good display performance.

Description

Technical Field

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

[0002] With the continuous development of display technology, organic light-emitting display panels are increasingly widely used in mobile phones, computers, televisions, car display panels, wearable devices and other display panels with display functions due to their advantages of self-luminescence, low driving voltage, high luminous efficiency, fast response speed, thinness, and high contrast. At present, the display performance of display panels is poor. Summary of the invention

[0003] Based on this, it is necessary to provide a display panel, a display device and a driving method of the display panel, aiming to improve the display performance of the display panel.

[0004] In a first aspect, an embodiment of the present application provides a display panel, including a display area and a non-display area, wherein the display panel further includes:

[0005] The pixel circuit is located in the display area and arranged in an array;

[0006] A light-emitting driving circuit is located in the non-display area and connected to the pixel circuit. The light-emitting driving circuit is used to generate a periodic light-emitting control signal and use the light-emitting control signal to scan each row of pixel circuits; 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-emitting control signal, respectively. The target width of the blanking area is used to indicate the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames; wherein the width refers to the width in the column direction of the pixel circuit.

[0008] In a second aspect, an embodiment of the present application further provides a display device, which includes the display panel provided in the first aspect.

[0009] In a third aspect, an embodiment of the present application further provides a method for driving a display panel, the method comprising:

[0010] Controlling a light-emitting driving circuit in the display panel to generate a periodic light-emitting control signal;

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

[0012] The display panel also 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-emitting control signal. The target width of the blanking area is used to indicate the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames; wherein the width refers to the width in the column direction of the pixel circuit.

[0013] The display panel, display device and display panel driving method provided by the embodiment of the present 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 circuit to generate a periodic light-emitting control signal and use the light-emitting control signal to scan each row of pixel circuits. The blanking area 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 in the column direction of the pixel circuit is respectively related to the number of rows of the pixel circuit and the period of the light-emitting control signal. The target width of the blanking area is used to represent the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames. In the present application, by controlling the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames to be related to the number of rows of the pixel circuit and the period of the light-emitting control signal, it is possible to avoid the display performance of the display panel being reduced due to the different states of the light-emitting control signal when the light-emitting control signal of each frame enters and exits the blanking area. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a light-emitting control signal entering and exiting a blanking zone in the related art;

[0015] FIG2 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 the present application;

[0017] Figure 4 A schematic diagram of a light emitting control signal entering and exiting a blanking zone provided in an embodiment of the present application;

[0018] FIG5 is a schematic diagram of another light emitting control signal entering and exiting a blanking zone provided by an embodiment of the present application;

[0019] FIG6 is a schematic diagram of another light emitting control signal entering and exiting the blanking zone provided in an embodiment of the present application;

[0020] FIG7 is a schematic diagram of another light emitting control signal entering and exiting the blanking zone provided by an embodiment of the present application;

[0021] FIG8 is a circuit structure diagram of a pixel circuit provided in an embodiment of the present application;

[0022] FIG9 is a schematic diagram of another display panel provided in an embodiment of the present application;

[0023] FIG10 is a circuit structure diagram of another pixel circuit provided in an embodiment of the present application;

[0024] FIG11 is a circuit structure diagram of another pixel circuit provided in an embodiment of the present application;

[0025] FIG12 is a timing diagram of a pixel circuit provided in an embodiment of the present application;

[0026] FIG13 is a circuit structure diagram of another pixel circuit provided in an embodiment of the present application;

[0027] FIG14 is a schematic flow chart of a method for driving a display panel provided in an embodiment of the present application;

[0028] FIG15 is a schematic flow chart of another method for driving a display panel provided in an embodiment of the present application;

[0029] FIG. 16 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related 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 can be directly on the other element or there may be intervening elements. Further, when a layer is referred to as being "under" another layer, it can be directly under or there may be one or more intervening elements. It is also understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or there may be one or more intervening elements.

[0033] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[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 only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present application.

[0035] It should also be understood that when interpreting an element, even if not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" can mean within one or more standard deviations, which are not limited here.

[0036] Furthermore, in the specification, the phrase “planar distribution schematic diagram” refers to a drawing when a target portion is viewed from above, and the phrase “cross-sectional schematic diagram” refers to a drawing when a section taken by vertically cutting the target portion is viewed from the side.

[0037] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0038] As described in the background technology section, the display performance of the display panel in the related art is poor. In the driving timing of the related display panel, in addition to the normal display time (corresponding to the display area scanning time) in each frame scanning time, a period of time will be set as the front and back corridor time, and the driving circuit can be adjusted during the front and back corridor time. The non-display area of ​​the display area is provided with a blanking area on one side of the column direction of the pixel circuit. For example, a virtual pixel circuit can be set in the non-display area, and the light-emitting driving circuit not only needs to send a light-emitting control signal to the pixel circuits of each row entity in the display area, but also needs to send a light-emitting control signal to the virtual pixel circuit in the blanking area. The time when the light-emitting driving circuit sends a light-emitting control signal to the virtual pixel circuit in the non-display area is the front and back corridor time. Therefore, the front and back corridor time can be understood as the stage of the light-emitting control signal scanning the blanking area corresponding to the virtual pixel circuit in the non-display area. Alternatively, the blanking area can also be equivalently understood as the interval time between two adjacent frames when the light-emitting control signal scans the pixel circuit in the display area. When the light-emitting driving circuit is multi-pulse driven, due to the existence of the blanking area, the state of the light-emitting control signal when the light-emitting control signal enters and exits the blanking area at the end and beginning of each frame will be different. Among them, the moment when the light-emitting control signal enters the blanking area can be understood as the end moment when the light-emitting control signal scans the pixel circuit in the display area within one frame, and the moment when the light-emitting control signal goes out of the blanking area can be understood as the start moment when the light-emitting control signal scans the pixel circuit in the display area within the next frame.

[0039] See also Figure 1 , Figure 1 It is a schematic diagram of the state of the light control signal when the light control signal Emit enters and goes out of the blanking area porch in the related technology. It can be seen that the light control signal has multiple different states when the light control signal Emit enters and goes out of the blanking area porch. For example, the first type is that the light control signal Emit enters the blanking area porch at a falling edge, the second type is that the light control signal Emit always maintains a low level state in the blanking area porch, the third type is that the light control signal Emit always maintains a high level state in the blanking area porch, and the fourth type is that the light control signal Emit enters the blanking area porch at a rising edge.

[0040] Different states of the light-emitting control signal Emit when entering and exiting the blanking area porch will cause light and dark horizontal stripes to appear on the display panel. Exemplarily, the light-emitting drive 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 drive circuit, and the second power signal line can provide a low-level signal VGL to the light-emitting drive circuit. Assuming that at the end of the first frame, the falling edge of the light-emitting control signal Emit enters the blanking area porch. Since there is no actual pixel circuit in the blanking area porch, the load on the second power signal line is relatively small at this time. Assuming that at the end of the second frame, the light-emitting control signal Emit always maintains a high-level state in the blanking area porch, it means that the falling edge of the light-emitting control signal Emit does not enter the blanking area porch. At this time, the load on the second power signal line is relatively large. In addition, due to other drive circuits used to drive the pixel circuit (for example, the bias circuit in the pixel circuit) The driving circuit of the transistor, the driving circuit of the reset transistor for resetting the anode of the light-emitting element in the pixel circuit) reuses the first power signal line and the second power signal line. The state of the light-emitting control signal Emit when entering and exiting the blanking area porch will cause the high level signal VGH on the first power signal line and / or the low level signal VGL on the second power signal line to be different at the end and beginning of different frames, causing the high level signal VGH and / or the low level signal VGL to change periodically according to the cycle of the light-emitting control signal Emit, thereby causing periodic differences in the scanning signals received by the bias adjustment transistor and / or the first reset transistor, resulting in the appearance of light and dark horizontal stripes related to the cycle of the light-emitting control signal Emit as shown in Figure 2 in the low grayscale screen, resulting in poor display effect of the display panel.

[0041] Based on the above technical problems, the inventors have found that the target width of the blanking area is designed according to the number of rows of pixel circuits and the period of the light-emitting control signal to shorten or eliminate the light and dark horizontal stripes during the display process of the display panel, so as to achieve the purpose of improving the display effect of the display panel. Based on this, the inventors have further studied the technical solution of the embodiment of the present application. Specifically, the display panel provided in the embodiment of the present application includes a display area and a non-display area, and the display panel also includes a pixel circuit, which is located in the display area and arranged in an array; a light-emitting driving circuit, which is located in the non-display area and connected to the pixel circuit, and the light-emitting driving circuit is used to generate a periodic light-emitting control signal, and use the light-emitting control signal to scan each row of pixel circuits; wherein, the non-display area also includes a blanking area, and the blanking area is located on at least one side of the display area in the column direction of the pixel circuit, and the target width of the blanking area is respectively related to the number of rows of the pixel circuit and the period of the light-emitting control signal, and the target width of the blanking area is used to indicate the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames; wherein, the width refers to the width in the column direction of the pixel circuit. By adopting the above technical solution, by adjusting the target width of the blanking area according to the number of pixel circuit rows and the period of the light-emitting control signal, the light and dark horizontal stripes associated with the period of the light-emitting control signal in the display panel can be reduced or eliminated, thereby 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 described clearly and completely below in conjunction with the drawings in the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In one embodiment, see Figure 3 The present 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 circuits 10 are located in the display area AA, and the pixel circuits 10 are arranged in an array.

[0045] The light-emitting driving circuit 20 is located in the non-display area FA, and the light-emitting driving circuit 20 is connected to the pixel circuit 10. The light-emitting driving circuit is used to generate a periodic light-emitting control signal, and use the light-emitting control signal to scan each row of pixel circuits 10. Exemplarily, the light-emitting driving circuit 20 is located on at least one side of the row direction of the pixel circuit 10. Exemplarily, the light-emitting driving circuit 20 is connected to each row of pixel circuits 10, respectively, and provides a light-emitting control signal for each row of pixel circuits 10.

[0046] The non-display area FA further includes a blanking area 30, which is located at least on one side of the display area AA in the column direction of the pixel circuit 10. Exemplarily, the blanking area 30 is located on a first side of the display area AA in the column direction of the pixel circuit 10, for example Figure 3 The lower side of the display area AA shown. In another exemplary embodiment, the blanking area 30 is located on the second side of the display area AA in the direction of the pixel circuit 10 columns. In another exemplary embodiment, the blanking area 30 is located on the first side and the second side of the display area AA in the direction of the pixel circuit 10 columns, wherein the first side and the second side are two sides oppositely arranged in the direction of the pixel point circuit 10 columns. In application, the position of the blanking area 10 can be set according to the actual display scene, which is not limited here.

[0047] The target width of the blanking area 30 is related to the number of rows of the pixel circuit 10 and the period of the light-emitting control signal. The target width of the blanking area 30 changes with at least one of the number of rows of the pixel circuit 10 and the period of the light-emitting control signal. The target width of the blanking area 30 is used to represent the interval time for the light-emitting control signal to scan each row of pixel circuits 10 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 area 30 is not an actual physical area, but an artificially defined concept.

[0048] In application, when a frame scan time ends, the next frame will not be started directly. There is a certain interval time between two adjacent frames. The interval time can be understood as follows: the display area AA has a blanking area 30 on one side of the column direction of the pixel circuit 10. A virtual pixel circuit can be set in the blanking area 30. After the light-emitting drive circuit 20 scans the actual pixel circuit 10 in the display area AA, it is also necessary to scan the virtual pixel circuit in the blanking area 30 before entering the next frame to scan the pixel circuit in the display area AA. The time for the light-emitting drive circuit 20 to scan the virtual pixel circuit in the non-display area FA is the interval time between two adjacent frames. The interval time can also be equivalently understood as the width of the blanking area 30 in the column direction of the pixel circuit. In other words, the physical length of the light-emitting control signal scanned in the column direction of the pixel circuit 10 during the interval time is the width of the blanking area 30 in the column direction of the pixel circuit 10.

[0049] Due to the existence of the blanking area 30, the state of the light control signal when the light control signal enters and exits the blanking area 30 at the end and beginning of each frame may be different, resulting in differences in the load on the power line that provides high-level signals and low-level signals to the light driving circuit 20 at different times, which in turn causes differences in the scanning signals received by other driving units connected to the power line at different times, resulting in light and dark stripes on the display panel. The present application relates the target width of the blanking area 30 to the number of rows of the pixel circuit 10 and the cycle of the light control signal, and adjusts and determines the target width of the blanking area 30 according to the number of rows of the pixel circuit 10 and / or the cycle of the light control signal, which can reduce or even eliminate the light and dark stripes on the display panel to a certain extent, or in other words, the target width of the blanking area 30 is designed to achieve the purpose of shortening and eliminating the light and dark stripes during the display process of the display panel. Exemplarily, the target width of the blanking area 30 can be set according to the number of rows of the pixel circuit 10 and the cycle of the light control signal to shorten the width of the light and dark stripes and make 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-emitting control signal to eliminate the light and dark horizontal stripes, that is, the target width of the blanking area 30, that is, the interval time between two adjacent frames, is controlled by the period of the light-emitting control signal, and the level state of the light-emitting control signal at the beginning and end of each frame is controlled to be the same, so that the light and dark horizontal stripes of the display panel can be eliminated. For details, please refer to the relevant content of the following embodiment.

[0050] The display panel provided by the embodiment of the present 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 circuit to generate a periodic light-emitting control signal, and uses the light-emitting control signal to scan each row of pixel circuits. The blanking area 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 in the column direction of the pixel circuit is respectively related to the number of rows of the pixel circuit and the period of the light-emitting control signal. The target width of the blanking area is used to represent the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames. In the present application, by controlling the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames to be related to the number of rows of the pixel circuit and the period of the light-emitting control signal, it is possible to avoid the display performance of the display panel being reduced due to the different states of the light-emitting control signal when the light-emitting control signal of each frame enters the blanking area.

[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 emitting control signal.

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

[0053] Exemplarily, assuming that the target width of the blanking area 30 is n, and the width of the pixel circuit that can be scanned by one cycle of the light emitting 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 horizontal stripe parameter. The target width is positively correlated with the width of the pixel circuit that can be scanned by one cycle of the light emitting control signal EM, which means k≥1.

[0054] As another example, the target width can be made proportional to the width of the pixel circuit that can be scanned by one cycle of the light emitting control signal, by making the target width of the blanking area 30 exactly an integer multiple of the width of the pixel circuit that can be scanned by the unit cycle of the light emitting control signal, that is, a=0, n=kT, k≥1 and k is a positive integer. In other words, the target width of the blanking area 30 is equal to the width of one or more complete pixel circuits that can be scanned by the light emitting control signal cycle. In this case, the state of the light emitting control signal when entering and exiting the blanking area 30 at different times is the same, so the load on the first power line and / or the second power line is the same at different times, avoiding the problem of the light emitting control signal entering and exiting the blanking area 30 causing the power line load to be different at different times, thereby solving the problem of high-level signals and low-level signals not changing periodically to cause horizontal stripes, thereby improving the display effect. Please refer to Figure 4 As shown in Figure 7, taking the case where the target width of the blanking area 30 is exactly equal to the width of the pixel circuit that can be scanned by one cycle of the light-emitting control signal, that is, taking k=1, a=0, and n=T as an example, it can be seen that the level state of the light-emitting control signal entering and leaving the blanking area 30 is the same, thereby eliminating the horizontal stripes.

[0055] In one embodiment, in the same frame, the level state of the light emitting control signal starting to scan the pixel circuit is the same as the level state of the light emitting control signal ending to scan the pixel circuit. That is, in the same frame, the level state of the light emitting control signal starting to scan the pixel circuit and the level state of the light emitting control signal ending to scan the pixel circuit are target states, respectively. The target state includes a high level state, a low level state, a state where a high level jumps to a low level, or a state where a low level jumps to a high level.

[0056] By setting the target width of the blanking area 30 to be exactly an integer multiple of the period of the light emitting 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 emitting control signal EM at the end of each frame, that is, when the light emitting control signal EM enters the blanking area 30, can be made the same as the level state of the light emitting control signal EM at the beginning of the next frame, that is, when the light emitting control signal EM goes out of the blanking area 30. Furthermore, the level state of the light emitting control signal EM at the beginning of scanning the pixel circuit in each frame can be made the same as the level state of the light emitting control signal EM at the end of scanning the pixel circuit. Therefore, it will not cause a load change on the first power signal line and / or the second power signal line, and will not cause bright and dark horizontal stripes to appear on the display panel.

[0057] For example, taking k=1 and a=0 as an example, in this case: for example, Figure 4 As shown in FIG. 5 , the state of the light emitting control signal EM at the end and start of each frame can be a state of jumping from a low level to a high level, that is, a rising edge state, and then the level state of the light emitting control signal EM at the beginning of each frame scanning the pixel circuit and the level state of the light emitting control signal EM at the end of each frame scanning the pixel circuit are both a state of jumping from a low level to a high level; for another example, as shown in FIG. 6 , the state of the light emitting control signal EM at the end and start of each frame is a state of jumping from a high level to a low level, and then the level state of the light emitting control signal EM at the beginning of each frame scanning the pixel circuit and the level state of the light emitting control signal EM at the end of each frame scanning the pixel circuit are both a high level state; for another example, as shown in FIG. 7 , the state of the light emitting control signal EM at the end and start of each frame is a state of jumping from a high level to a low level, and then the light emitting control signal EM at the end of each frame scanning the pixel circuit The level state of the light emitting control signal EM starting to scan the pixel circuit and the level state of the light emitting control signal EM ending to scan the pixel circuit are both in the state of high level jumping to low level; for another example, as shown in Figure 7, the state of the light emitting control signal EM at the end and start of each frame is both in the low level state, and thus the level state of the light emitting control signal EM starting to scan the pixel circuit and the level state of the light emitting control signal EM ending to scan the pixel circuit are both in the low level state; in this regard, the level state of the light emitting control signal starting to scan the pixel circuit and the level state of the light emitting control signal ending to scan the pixel circuit in the same frame are the same, 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 on the display panel, thereby improving the display performance of the display panel.

[0058] In one embodiment, the width of the abnormal horizontal stripes generated by the light emitting control signal does not exceed the preset width threshold. The abnormal horizontal stripe width is related to the target width, and the abnormal horizontal stripe width is the difference between the target width and the product of the first width and the correlation coefficient. Assuming that the abnormal horizontal stripe width is D, D=nT*k≤preset width threshold, 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 the application, the preset width threshold is predefined and used to define the width of the abnormal horizontal stripes. For example, the preset width threshold may be less than or equal to the minimum recognition width of the human eye. Based on this, when the width of the abnormal horizontal stripes generated by the light emitting control signal does not exceed the preset width threshold, the abnormal horizontal stripes have little effect on the display panel, so that they are invisible to the human eye, thereby achieving the purpose of 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 pixel circuit equivalent to the target width, T represents the first width, and [ ] represents rounding down.

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

[0062] In an exemplary embodiment, 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]; wherein, m represents the number of pulses of the light emitting control signal in one frame, that is, m represents the number of valid pulses of the light emitting 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 rows N of pixel circuits in the display area and the number of rows n of virtual pixel circuits in the blanking area divided by the number of pulses m of the light-emitting control signal in one frame, that is, 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 the application, since the number of pulses m of the light-emitting 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. By selecting a value from the width range as the target width n, the preset width threshold can be made less than or equal to the minimum recognition width of the human eye, or the number of rows of the pixel circuit equivalent to the horizontal stripe width can be made greater than or equal to the difference between the first width and the number of rows of the pixel circuit equivalent to the preset width threshold, so that the human eye cannot observe the abnormal horizontal stripes, thereby reducing the impact of the abnormal horizontal stripe width on the display panel and improving the display effect of the display panel.

[0064] In an 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. A first target width of a first blanking area of ​​the display panel in the first light emitting control mode is greater than a second target width of a second blanking area of ​​the display panel in the second light emitting control mode.

[0065] It can be understood that the display panel can have multiple light-emitting modes. In different light-emitting modes, the light-emitting control signals output by the light-emitting driving circuit to the pixel circuit are different, so that the display panel can have multiple refresh frequencies. Exemplarily, 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 frequency of the display panel is the first refresh frequency; 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 frequency of the display panel is the second refresh frequency. The first light-emitting control signal and the second light-emitting control signal have different periods.

[0066] When the period of the light-emitting 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 by one period of the corresponding light-emitting control signal by the same multiple, the longer the period of the light-emitting control signal, the larger the target width of the corresponding blanking area. When the display panel switches between different light-emitting control modes, the horizontal stripes can be eliminated or reduced by switching the width of the blanking area to the target width of the blanking area corresponding to the corresponding light-emitting control signal. Exemplarily, 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, when the display panel switches from the first refresh frequency to the second refresh frequency, 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, and when the display panel switches from the second refresh frequency to the first refresh frequency, 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 better display performance regardless of the refresh frequency.

[0067] In an exemplary embodiment, referring to FIG8 , the pixel circuit includes a driving transistor T1, a first light-emitting control module 11, and a second light-emitting control module 12, wherein the first electrode of the driving transistor T1 is connected to the second end of the first light-emitting control module, and the second electrode of the driving transistor T1 is connected to the first end of the second light-emitting control module. The first end of the first light-emitting control module 11 is used to receive the first level signal PVDD, and the control end of the first light-emitting control module 11 is connected to the output end of the light-emitting driving circuit 20 to receive the light-emitting control signal EM. The second end of the second light-emitting control module 12 is connected to the anode of the light-emitting device D, and the control end of the second light-emitting control module 12 is connected to the output end of the light-emitting driving circuit 20 to receive the light-emitting control signal EM.

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

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

[0070] In an exemplary embodiment, referring to Figures 9 and 10, the light-emitting driving circuit 20 includes a first light-emitting driving circuit 21 and a second light-emitting driving circuit 22, wherein the first light-emitting driving circuit 21 is used to generate a third light-emitting control signal EM3, and the second light-emitting driving circuit 22 is used to generate a fourth light-emitting control signal EM4, and the period of the third light-emitting control signal EM3 is different from the period of the fourth light-emitting control signal; wherein the control end of the first light-emitting control module 11 is connected to the output end of the first light-emitting driving circuit for receiving the third light-emitting control signal EM3; the control end of the second light-emitting control module 12 is connected to the output end of the second light-emitting driving circuit 22 for receiving the fourth light-emitting control signal EM4; and the target width is respectively related to the period of the third light-emitting control signal EM3 and the period of the fourth light-emitting control signal EM4.

[0071] In the application, the periodic frequencies of the light control signals received by the first light control module 11 and the second light control module 12 may be different. In this case, it is necessary to determine the range of the first target width n1 according to the period of the third light control signal EM3, determine the range of the second target width n2 according to the period of the fourth light control signal EM4, and then determine the target width of the blanking area according to the intersection of the two. For example, assuming that 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 generally 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: [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 comprehensively determined according to the above two inequalities. It can be understood that the target width of the blanking area determined in this way can make the horizontal stripes in the display panel invisible under the third light control signal EM3 and the fourth light control signal EM4.

[0075] In an exemplary embodiment, as shown in FIG11 , the pixel circuit further includes: a bias reset module 13 and a first initialization module 14, wherein the first end of the bias reset module 13 is respectively connected to the first electrode of the driving transistor T1 and the second end of the first light emitting control module 11, the second end of the bias reset module 13 is used to receive the bias reset signal DVH, and the control end of the bias reset module 13 is used to receive the first scanning signal SPX. The first end of the first initialization module 14 is used to receive the first initialization signal Vref1, the second end of the first initialization module 14 is respectively connected to the second end of the second light emitting control module 12 and the anode of the light emitting device D, and the control end of the first initialization module is used to receive the first scanning signal SPX.

[0076] 12 , the bias reset module 13 and the first initialization module 14 are respectively turned on in a first period t1 in response to the first scan signal SPX, and the first light control module 11 and the second light control module 12 are respectively turned off in a second period t2 in response to the light control signal EM.

[0077] Specifically, the bias reset module 13 includes a bias reset transistor T4, the first electrode of the bias reset transistor T4 is respectively connected to the first electrode of the driving transistor T1 and the second end of the first light emitting control transistor T2, the second electrode of the bias reset transistor T43 is used to receive the bias reset signal DVH, and the gate of the bias reset transistor T4 is used to receive the first scanning signal SPX. The first initialization module 14 includes a first initialization transistor T5, the first electrode of the first initialization transistor T5 is used to receive the first initialization signal Vref1, the second electrode of the first initialization transistor T5 is respectively connected to the second end of the second light emitting control module 12 and the anode of the light emitting device D, and the gate of the first initialization transistor T5 is used to receive the first scanning signal SPX. In the second period when the first light emitting control module 11 and the second light emitting control module 12 are disconnected in response to 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 scanning signal SPX to bias reset the first electrode and / or gate of the driving transistor T1 and initialize the anode of the light emitting device D.

[0078] In an exemplary embodiment, as shown in FIG13 , the pixel circuit further includes a data writing module 15, a threshold compensation module 16, and a second initialization module 17. The first end of the data writing module 15 is used to receive the data signal Vdata, the second end of the data writing module 15 is connected to the first electrode of the driving transistor T1, and the control end of the data writing module 42 is used to receive the second scanning signal SP. The first end of the threshold compensation module 16 is connected to the second electrode of the driving transistor T1, the second end of the threshold compensation module 16 is connected to the gate of the driving transistor T0, and the control end of the threshold compensation module 16 is used to receive the third scanning signal S2N. The first end of the second initialization module 17 is connected to the second end of the threshold compensation module 16 and the gate of the driving transistor T1, the second end of the second initialization module 17 is used to receive the second initialization signal Vref2, and the control end of the second initialization module 17 is used to receive the fourth scanning signal S1N.

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

[0080] Based on the same inventive concept, please refer to FIG. 14 , the present application also provides a method for driving a display panel, the method comprising step S1401 and step S1402 .

[0081] S1401: Control the light-emitting driving circuit in the display panel to generate a periodic light-emitting control signal.

[0082] 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 respectively related to the number of rows of the pixel circuit and the period of the light-emitting control signal. The target width of the blanking area is used to indicate the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames; wherein the width refers to the width in the column direction of the pixel circuit. The display panel may be the display panel provided in the aforementioned embodiment. For a specific introduction, please refer to the aforementioned related content, which will not be repeated here. For a specific introduction of the blanking area, please refer to the aforementioned related content, which will not be repeated here.

[0083] S1402: Scanning each row of pixel circuits located in the display area of ​​the display panel using a light emitting control signal.

[0084] In the present application, the target width of the blanking area is determined comprehensively by the period of the light-emitting control signal and the number of rows of pixel circuits, so that when the light-emitting control signal is used to scan the pixel circuits in each row in the display area of ​​the display panel, the light and dark horizontal stripes of the display panel can be reduced or even eliminated to a certain extent. For example, the target width of the blanking area can be determined comprehensively by the period of the light-emitting control signal and the number of rows of pixel circuits to reduce the width of the horizontal stripes, or completely eliminate the horizontal stripes, so that when the light-emitting control signal is used to scan the pixel circuits in each row of the display area, there are no horizontal stripes in the display panel or the horizontal stripes are invisible.

[0085] In an exemplary embodiment, referring to FIG. 15 , the display panel includes a first light emitting control mode and a second light emitting control mode, and the method further includes step S1501 and step S1502 .

[0086] S1501: Switching the light-emitting driving circuit to a target light-emitting control mode, where the target light-emitting control mode includes a first light-emitting control mode or a second light-emitting control mode.

[0087] It can be understood that the display panel can have a variety of refresh frequencies. Under different refresh frequencies, the period of the light emitting control signal is different, and the corresponding target width of the blanking area is also different.

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

[0089] Exemplarily, the first light control signal in the first light control mode corresponds to the first blanking area, and the first blanking area has a first target width. The second light control signal in the second light control mode corresponds to the second blanking area, and the second blanking area has a second target width. When the display panel is in the first light control mode, the width of the blanking area is adjusted to the first target width, and when the display panel is in the second light control mode, the width of the blanking area is adjusted to the second target width, so that the display panel has better display performance regardless of the light control mode.

[0090] Based on the same application concept, the embodiment of the present application also provides a display device. FIG16 is a schematic diagram of the structure of a display device 200 provided in an embodiment of the present application. As shown in FIG16 , the display device 200 includes a display panel 100 in any of the above embodiments. Exemplarily, as shown in FIG16 , 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 by referring to the above explanation of the display panel 100, which will not be repeated below.

[0091] The display device 200 provided in the embodiment of the present application can be the mobile phone shown in Figure 16, or it can be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiment of the present application does not make any special limitations on this.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: The display panel includes a display area and a non-display area, and further includes: The pixel circuit is located in the display area and arranged in an array; A light-emitting driving circuit is located in the non-display area and connected to the pixel circuit. The light-emitting driving circuit is used to generate a periodic light-emitting control signal and use the light-emitting control signal to scan each row of pixel circuits; 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-emitting control signal, respectively. The target width of the blanking area is used to indicate the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames; wherein the width refers to the width in the column direction of the pixel circuit.

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; wherein the first width is the width of a pixel circuit that can be scanned in one cycle of the light emitting control signal.

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: In the same frame, the level state of the light emitting control signal when starting to scan the pixel circuit is the same as the level state of the light emitting control signal when ending to scan the pixel circuit.

5. The display panel according to claim 1, characterized in that: In the same frame, the level state at which the light-emitting control signal starts scanning the pixel circuit and the level state at which the light-emitting control signal ends scanning the pixel circuit are target states, respectively, and the target states include a high level state, a low level state, a state where a high level jumps to a low level, or a state where a low level jumps to a high level.

6. The display panel according to claim 3, characterized in that: The abnormal horizontal stripe width generated by the light emitting control signal does not exceed a preset width threshold; wherein the abnormal horizontal stripe width is related to the target width, and the abnormal horizontal stripe width is the difference between the target width and the product of the first width and the correlation coefficient.

7. The display panel according to claim 6, characterized in that: The target width satisfies: n-[n / T]*T≤[L0 / h], or, n-[n / T]*T≥T-[L0 / h], wherein 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 to which the target width is equivalent, T represents the first width, and [ ] represents rounding down.

8. The display panel according to claim 7, characterized in that: 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]; wherein m represents the number of pulses of the light emitting control signal in one frame, and N represents the number of rows of the pixel circuit.

9. 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: a first light-emitting control signal generated by the light-emitting driving circuit in the first light-emitting control mode, and a second light-emitting control signal generated in the second light-emitting control mode; wherein a period of the first light-emitting control signal is greater than a period of the second light-emitting control signal; A first target width of a first blanking area of ​​the display panel in the first light emission control mode is greater than a second target width of a second blanking area of ​​the display panel in the second light emission control mode.

10. 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 electrode of the driving transistor is connected to the second end of the first light emitting control module, and the second electrode of the driving transistor is connected to the first end of the second light emitting control module; The first end of the first light emitting control module is used to receive a first level signal, and the control end of the first light emitting control module is connected to the output end of the light emitting driving circuit; The second end of the second light emitting control module is connected to the anode of the light emitting device, and the control end of the second light emitting control module is connected to the output end of the light emitting driving circuit.

11. The display panel according to claim 10, characterized in that: The light-emitting driving circuit comprises a first light-emitting driving circuit and a second light-emitting driving circuit, wherein the first light-emitting driving circuit is used to generate a third light-emitting control signal, and the second light-emitting driving circuit is used to generate a fourth light-emitting control signal, and the period of the third light-emitting control signal is different from the period of the fourth light-emitting control signal; wherein, The control end of the first light emitting control module is connected to the output end of the first light emitting driving circuit; The control end of the second light emitting control module is connected to the output end of the second light emitting driving circuit; The target width is respectively related to a period of the third light emitting control signal and a period of the fourth light emitting control signal.

12. The display panel according to claim 10, characterized in that: The pixel circuit further includes: a bias reset module and a first initialization module, wherein: The first end of the bias reset module is connected to the first electrode of the driving transistor and the second end of the first light emitting control module respectively, the second end of the bias reset module is used to receive a bias reset signal, and the control end of the bias reset module is used to receive a first scanning signal; The first end of the first initialization module is used to receive a first initialization signal, the second end of the first initialization module is connected to the second end of the second light-emitting control module and the anode of the light-emitting device respectively, and the control end of the first initialization module is used to receive a first scanning signal; The bias reset module and the first initialization module are respectively turned on in a first time period in response to the first scanning signal, and the first light emitting control module and the second light emitting control module are respectively turned off in a second time period in response to the light emitting control signal.

13. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 12.

14. A method for driving a display panel, characterized in that: The method comprises: Controlling a light-emitting driving circuit in the display panel to generate a periodic light-emitting control signal; The light emitting control signal is used to scan each row of pixel circuits located in the display area of ​​the display panel; wherein, The display panel also 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-emitting control signal. The target width of the blanking area is used to indicate the interval time for the light-emitting control signal to scan each row of pixel circuits in two adjacent frames; wherein the width refers to the width in the column direction of the pixel circuit.

15. The method for driving a display panel according to claim 14, characterized in that: The display panel includes a first light emission control mode and a second light emission control mode, and the method further includes: Switching the light-emitting driving circuit to a 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 a target light emitting control signal corresponding to the target light emitting control mode.

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