Display panel and brightness adjustment method thereof, and display device

Abstract

The present application discloses a display panel and a brightness adjustment method and a display device thereof. The display panel has a first display area and a second display area, the pixel density of the first display area is less than the pixel density of the second display area, and the display panel includes: a power supply unit, including a power output terminal; a first power line, electrically connected to the sub-pixel of the first display area; a second power line, electrically connected to the sub-pixel of the second display area; and a voltage adjustment unit; wherein the first end of the second power line is electrically connected to the power output terminal, and the second end of the second power line is electrically connected to the first power line through the voltage adjustment unit, and the voltage adjustment unit is used to adjust the voltage on the first power line. According to an embodiment of the present application, the brightness consistency of the display panel under a monochrome screen can be improved.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a display panel and a brightness adjustment method thereof, and a display device. Background Art

[0002] With the rapid development of electronic devices, users have higher and higher requirements for screen-to-body ratio, making the full-screen display of electronic devices receive more and more attention in the industry.

[0003] Currently, there is a design of under-screen camera, which means that the camera is located under the display screen and does not affect the display function of the display screen. Usually, a white screen is used for gamma debugging to ensure the consistency of display brightness between the area where the camera is set and the area where the camera is not set on the display screen under the white screen. However, since the current on the power line is different under monochrome screen and white screen, the voltage drop (IR drop) on the power line is also different under monochrome screen and white screen, resulting in the problem that the display brightness of the area where the camera is set and the area where the camera is not set is consistent under white screen, but inconsistent under monochrome screen. Summary of the invention

[0004] The embodiments of the present application provide a display panel and a brightness adjustment method thereof, and a display device, which can improve the brightness consistency of the display panel under a monochrome screen.

[0005] In a first aspect, an embodiment of the present application provides a display panel having a first display area and a second display area, wherein the pixel density of the first display area is less than the pixel density of the second display area, and the display panel comprises: a power supply unit, comprising a power output terminal; a first power line, electrically connected to the sub-pixels of the first display area; a second power line, electrically connected to the sub-pixels of the second display area; and a voltage regulating unit; wherein a first end of the second power line is electrically connected to the power output terminal, and a second end of the second power line is electrically connected to the first power line via the voltage regulating unit, and the voltage regulating unit is used to regulate the voltage on the first power line.

[0006] In a possible implementation of the first aspect, the voltage regulating unit includes a driving module, a control end of the driving module is electrically connected to the control signal end, an input end of the driving module is electrically connected to the second end of the second power line, and an output end of the driving module is electrically connected to the first power line.

[0007] In a possible implementation of the first aspect, the driving module includes a first transistor, a gate of the first transistor is electrically connected to the control signal end, a first electrode of the first transistor is electrically connected to the second end of the second power line, and a second electrode of the first transistor is electrically connected to the first power line.

[0008] In a possible implementation of the first aspect, the voltage regulation unit further includes a first control signal writing module and a first storage module; wherein,

[0009] The first control signal writing module is electrically connected to the control terminal and the control signal terminal of the driving module, and is used to write the control signal of the control signal terminal into the control terminal of the driving module;

[0010] The first storage module is electrically connected to the control end of the driving module and is used to maintain the potential of the control end of the driving module.

[0011] In a possible implementation of the first aspect, the driving module includes a second transistor, the first control signal writing module includes a third transistor, and the first storage module includes a first capacitor; wherein,

[0012] A first electrode of the second transistor is electrically connected to a second end of the second power line, and a second electrode of the second transistor is electrically connected to the first power line;

[0013] The gate of the third transistor is electrically connected to the scan signal terminal, the first electrode of the third transistor is electrically connected to the control signal terminal, and the second electrode of the third transistor is electrically connected to the gate of the second transistor;

[0014] The first electrode of the first capacitor is electrically connected to the second end of the second power line, and the second electrode of the first capacitor is electrically connected to the gate of the second transistor.

[0015] In a possible implementation of the first aspect, the voltage regulation unit further includes a second control signal writing module, a compensation module, an initialization module and a second storage module; wherein,

[0016] The second control signal writing module is electrically connected to the input terminal and the control signal terminal of the driving module, and is used to write the control signal of the control signal terminal into the control terminal of the driving module;

[0017] The compensation module is electrically connected to the output terminal and the control terminal of the driving module, and is used to detect and self-compensate for the threshold voltage deviation in the driving module;

[0018] The initialization module is electrically connected to the control end and the reference signal end of the driving module, and is used to initialize the control end of the driving module;

[0019] The second storage module is electrically connected to the control end of the driving module and is used to maintain the potential of the control end of the driving module.

[0020] In a possible implementation of the first aspect, the driving module includes a fourth transistor, the second control signal writing module includes a fifth transistor, the compensation module includes a sixth transistor, the initialization module includes a seventh transistor, and the second storage module includes a second capacitor; wherein,

[0021] A first electrode of the fourth transistor is electrically connected to the second end of the second power line, and a second electrode of the fourth transistor is electrically connected to the first power line;

[0022] A gate of the fifth transistor is electrically connected to the second scan signal terminal, a first electrode of the fifth transistor is electrically connected to the control signal terminal, and a second electrode of the fifth transistor is electrically connected to a first electrode of the fourth transistor;

[0023] The gate of the sixth transistor is electrically connected to the second scanning signal terminal, the first electrode of the sixth transistor is electrically connected to the second electrode of the fourth transistor, and the second electrode of the sixth transistor is electrically connected to the gate of the fourth transistor;

[0024] The gate of the seventh transistor is electrically connected to the first scanning signal terminal, the first electrode of the seventh transistor is electrically connected to the reference signal terminal, and the second electrode of the seventh transistor is electrically connected to the gate of the fourth transistor;

[0025] A first electrode of the second capacitor is electrically connected to the second end of the second power line, and a second electrode of the second capacitor is electrically connected to the gate of the fourth transistor.

[0026] In a second aspect, an embodiment of the present application provides a brightness adjustment method for a display panel, for determining a voltage value of a control signal at a control signal terminal of the display panel according to any embodiment of the first aspect, the method comprising:

[0027] Setting the control signal at the control signal terminal to an initial voltage value, and performing gamma adjustment on the display panel to make the brightness of the first display area and the second display area consistent under each grayscale white screen;

[0028] Under the initial voltage value, the first display area and the second display area both display a first grayscale monochrome image, and determine whether the brightness difference between the first display area and the second display area is within a first preset range;

[0029] If the brightness difference between the first display area and the second display area is not within the first preset range, the initial voltage value is adjusted to obtain a first voltage value, and under the first voltage value, the brightness difference between the first display area and the second display area is within the first preset range;

[0030] The first voltage value is used as the voltage value of the control signal at the control signal terminal when both the first display area and the second display area display the first grayscale monochrome picture.

[0031] In a possible implementation of the second aspect, the method for adjusting the brightness of a display panel further includes:

[0032] Under the initial voltage value, the second display area displays a first grayscale monochrome picture and the first display area displays a second grayscale monochrome picture, and it is determined whether the difference between the brightness value of the first display area and the target brightness value is within a second preset range;

[0033] If the difference between the brightness value of the first display area and the target brightness value is not within the second preset range, the initial voltage value is adjusted to obtain a second voltage value, and under the second voltage value, the difference between the measured brightness value of the first display area and the target brightness value is within the second preset range;

[0034] The second voltage value is used as the voltage value of the control signal at the control signal terminal when the second display area displays the first grayscale monochrome picture and the first display area displays the second grayscale monochrome picture.

[0035] In a possible implementation of the second aspect, the method for adjusting the brightness of a display panel further includes:

[0036] According to the maximum voltage drop of the second power line, the display screen of the second display area is divided into a plurality of first levels, and the display screen of the first display area is divided into a plurality of second levels; wherein the current of the second display area at each first level is different, and the current of the first display area at each second level is different;

[0037] The corresponding relationship between the first level, the second level and the voltage value of the control signal at the control signal terminal is determined.

[0038] A third method is to provide a display device according to an embodiment of the present application, comprising the display panel described in any one of the embodiments of the first aspect.

[0039] According to the embodiments of the present application, on the one hand, compared with the first power line and the second power line being electrically connected to different power output terminals, the first power line and the second power line in the embodiments of the present application are electrically connected to the same power output terminal, which can simplify the structure of the power supply unit; on the other hand, by providing a voltage adjustment unit, the voltage adjustment unit can adjust the voltage on the first power line, that is, it can process the voltage on the first power line to provide the voltage required for the first display area to display a monochrome picture, thereby avoiding the problem of consistent brightness of the first display area and the second display area under a white picture and inconsistent brightness under a monochrome picture due to the different voltage drops of the second power line under a white picture and a monochrome picture, thereby improving the brightness consistency of the first display area and the second display area of ​​the display panel under a monochrome picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0041] Figure 1 A schematic top view of a display panel provided by an embodiment of the present application is shown;

[0042] Figure 2A schematic diagram showing the structure of a voltage regulating unit provided by an embodiment of the present application is shown;

[0043] Figure 3 A schematic diagram showing the structure of a voltage regulating unit provided in another embodiment of the present application is shown;

[0044] Figure 4 Show Figure 3 A timing diagram of

[0045] Figure 5 A schematic diagram showing the structure of a voltage regulating unit provided in yet another embodiment of the present application is shown;

[0046] Figure 6 A schematic diagram showing the structure of a voltage regulating unit provided in yet another embodiment of the present application is shown;

[0047] Figure 7 Show Figure 6 A timing diagram of

[0048] Figure 8 A schematic diagram showing the structure of a voltage regulating unit provided in yet another embodiment of the present application is shown;

[0049] Fig. 9 A schematic diagram showing the structure of a voltage regulating unit provided in yet another embodiment of the present application is shown;

[0050] Fig.10 Show Fig. 9 A timing diagram of

[0051] Fig.11 A schematic diagram showing a flow chart of a method for adjusting brightness of a display panel provided by an embodiment of the present application;

[0052] Fig.12 A schematic diagram showing a flow chart of a method for adjusting brightness of a display panel provided in another embodiment of the present application;

[0053] Fig.13 A schematic diagram showing the structure of a display device provided by an embodiment of the present application is shown;

[0054] Fig.14 A schematic structural diagram of a brightness adjustment device for a display panel provided in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0055] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0057] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0058] Figure 1 FIG. 2 is a schematic top view of a display panel provided according to an embodiment of the present invention. Figure 1 As shown, the display panel 100 may include a first display area AA1 and a second display area AA2. The second display area AA2 may at least partially surround the first display area AA1. The light transmittance of the first display area AA1 is greater than the light transmittance of the second display area AA2. The display panel may be an organic light emitting diode (OLED) display panel.

[0059] Herein, the transmittance of the first display area AA1 may be greater than or equal to 15%. To ensure that the transmittance of the first display area AA1 is greater than 15%, even greater than 40%, or even higher, the transmittance of at least part of the functional film layer of the display panel 100 in the first display area AA1 in this embodiment may be greater than 80%, or even greater than 90%.

[0060] According to the display panel 100 of the embodiment of the present invention, the transmittance of the first display area AA1 is greater than the transmittance of the second display area AA2, so that the display panel 100 can integrate a photosensitive component on the back of the first display area AA1, thereby realizing under-screen integration of a photosensitive component such as a camera. At the same time, the first display area AA1 can display images, thereby increasing the display area of ​​the display panel 100 and realizing a full-screen design of the display device.

[0061] The display panel 100 includes a power supply unit 10, a first power supply line (Vdd line) 21, a second power supply line 22 and a voltage adjustment unit 30. In addition, sub-pixels (not shown) are disposed in the first display area AA1 and the second display area AA2 of the display panel 100.

[0062] In order to improve the light transmittance of the first display area AA1, the pixel density (Pixels Per Inch, PPI) of the first display area AA1 is usually set to be lower than the pixel density of the second display area AA2. Since the pixel density of the first display area AA1 is relatively low, in order to ensure the consistency of brightness when the first display area AA1 and the second display area AA2 display the same picture, the brightness of a single sub-pixel in the first display area AA1 can be controlled to be greater than the brightness of a single sub-pixel in the second display area AA2. For example, the data voltage of a single sub-pixel in the first display area AA1 can be controlled to be lower than the data voltage of a single sub-pixel in the second display area AA2, so as to achieve the purpose of the brightness of a single sub-pixel in the first display area AA1 being greater than the brightness of a single sub-pixel in the second display area AA2.

[0063] After gamma debugging of the display panel using a white screen, the display brightness of the first display area AA1 and the second display area AA2 is consistent under the white screen. Because in a white screen, sub-pixels of all colors need to be lit, while in a monochrome screen, only sub-pixels of one color need to be lit, so the current on the second power line 22 is different in a monochrome screen and a white screen, and thus the voltage drop on the second power line 22 is also different in a monochrome screen and a white screen, and there is a problem that the display brightness of the first display area AA1 and the second display area AA2 is consistent under a white screen, but inconsistent under a monochrome screen.

[0064] The embodiment of the present application further includes a voltage regulating unit 30 , which is used to regulate the voltage on the first power line 21 .

[0065] In some embodiments, the display panel 100 may further include a non-display area NA. The power supply unit 10 and the voltage adjustment unit 30 may be disposed in the non-display area NA.

[0066] For example, the power supply unit 10 may be an integrated circuit (IC). The power supply unit 10 may be bound to the display panel via a flexible printed circuit (FPC), which is not limited in the present application. The power supply unit 10 includes a power output terminal 11.

[0067] The first power line 21 is electrically connected to the sub-pixels in the first display area AA1, and the second power line 22 is electrically connected to the sub-pixels in the second display area AA2. Exemplarily, the end of the second power line 22 close to the power unit 10 is the first end 221 of the second power line 22, and the end of the second power line 22 away from the power unit 10 is the second end 222 of the second power line 22. The first end 221 of the second power line 22 is electrically connected to the power output terminal 11, and the second end 222 of the second power line 22 is electrically connected to the first power line 21 through the voltage adjustment unit 30.

[0068] According to the embodiment of the present application, on the one hand, compared with the first power line 21 and the second power line 22 being electrically connected to different power output terminals, the first power line 21 and the second power line 22 in the embodiment of the present application are electrically connected to the same power output terminal, which can simplify the structure of the power supply unit 10; on the other hand, by providing a voltage adjustment unit 30, the voltage adjustment unit 30 can adjust the voltage on the first power line 21, that is, it can process the voltage on the first power line 21 to provide the voltage required for the first display area to display a monochrome picture, thereby avoiding the problem that the brightness of the first display area AA1 and the second display area AA2 is consistent under the white picture and inconsistent under the monochrome picture due to the different voltage drops of the second power line 22 under the white picture and the monochrome picture, thereby improving the brightness consistency of the first display area AA1 and the second display area AA2 of the display panel under the monochrome picture.

[0069] Exemplarily, the number of the first power lines 21 may be multiple, and the multiple first power lines 21 are spaced apart in the first direction X and extend along the second direction Y. In addition, the number of the second power lines 22 may also be multiple, and the multiple second power lines 22 are spaced apart in the first direction X and extend along the second direction Y. The first direction X intersects the second direction Y. For example, the first direction X and the second direction Y may be perpendicular, the first direction X is a row direction, and the second direction Y is a column direction, which is not limited in the present application.

[0070] Exemplarily, the first end 221 of each second power line 22 is connected to the connection line 23, and the second end 222 of the second power line 22 is connected to the connection line 24. Figure 1 As shown, the second power line 22 directly opposite to the first display area AA1 in the second direction Y and the second power lines 22 on both sides of the first display area AA1 in the first direction X can be connected to the voltage regulating unit 30 through the connecting line 24. It can be understood that a plurality of second power lines 22 are connected in parallel between the power output terminal 11 and the voltage regulating unit 30. In addition, the voltage regulating unit 30 can be electrically connected to each first power line 21 through the connecting line 25, that is, one end of each first power line 21 is connected to the connecting line 25. The number of the voltage regulating units 30 can be two, and the two voltage regulating units 30 are connected to both ends of the connecting line 25. The number of the second power lines 22 electrically connected to the two voltage regulating units 30 can be equal. It can be understood that the voltages output by the two voltage regulating units 30 are equal. In addition, the size of the first display area is usually much smaller than the size of the second display area, the first power line 21 and the connecting line 25 are relatively short, and the voltage drop of the first power line 21 and the connecting line 25 can be negligible. That is to say, the potentials at various positions on the first power line 21 and the connection line 25 can be considered to be the same.

[0071] For example, Figure 1 As shown, the display panel further includes a power line Vss located in the non-display area, and the power supply unit 10 further includes a power output terminal 12, and the power line Vss is electrically connected to the power output terminal 12. The power output terminal 11 provides a positive voltage, and the power output terminal 12 provides a negative voltage. The power line Vss is electrically connected to the cathode of the sub-pixel of the display panel (not shown in the figure). The current flow of the display panel can be as follows Figure 1 As shown by the middle arrow, the current flows from the second power line 22 to the first power line 21 through the voltage adjustment unit 30, and the current on the second power line 22 flows to the power line Vss through the sub-pixels in the second display area, and the current on the first power line 21 flows to the power line Vss through the sub-pixels in the first display area.

[0072] Figure 1 In the figure, the second power line 22 that the first display area AA1 faces in the second direction Y is connected to the voltage regulating unit 30. It can be understood that the second power line 22 that the first display area AA1 faces in the second direction Y will also flow to the voltage regulating unit 30. Of course, Figure 1This is just an example, and it can also be set that some of the second power lines 22 are connected to the voltage regulating unit 30, and some of the second power lines 22 are not connected to the voltage regulating unit 30. The current on the second power lines 22 connected to the voltage regulating unit 30 will flow to the voltage regulating unit 30, and the current on the second power lines 22 not connected to the voltage regulating unit 30 will not flow to the voltage regulating unit 30. The present application does not limit the number of second power lines 22 connected to the voltage regulating unit 30.

[0073] In some optional embodiments, such as Figure 2 As shown, the voltage regulating unit 30 may include a driving module 301, a control end of the driving module 301 is electrically connected to the control signal end SW, an input end of the driving module 301 is electrically connected to the second end 222 of the second power line 22, and an output end of the driving module 301 is electrically connected to the first power line 21. The control signal end SW may also be referred to as a switch signal (Switch) end.

[0074] For example, the voltage of the control signal output by the control signal terminal SW can be set to adjust the voltage on the first power line 21 to achieve brightness control of the first display area AA1. The control signal terminal SW can be integrated on the driver chip of the display panel 100, which is not limited in this application.

[0075] According to the embodiment of the present application, only the driving module 301 needs to be provided to adjust the voltage on the first power line 21 , which is simple and convenient.

[0076] In some optional embodiments, such as Figure 3 As shown, the driving module 301 may include a first transistor T1, a gate of the first transistor T1 is electrically connected to the control signal terminal SW, a first electrode of the first transistor T1 is electrically connected to the second terminal 222 of the second power line 22, and a second electrode of the first transistor T1 is electrically connected to the first power line 21. In other words, the first electrode of the first transistor T1 is the input terminal of the driving module 301, and the second electrode of the first transistor T1 is the output terminal of the driving module 301.

[0077] Exemplarily, the first transistor T1 may be a P-type transistor or an N-type transistor. For example, if the first transistor T1 is a P-type transistor, Figure 4 As shown, when the second display area AA2 is in the light-emitting state, the control signal sw output by the control signal terminal SW should be at a low level to ensure that the first transistor T1 is turned on, so that the sub-pixel in the first display area AA1 can emit light.

[0078] According to the embodiment of the present application, only one transistor is required to adjust the voltage on the first power line 21, which is relatively simple in structure. Moreover, only the voltage output by the control signal terminal SW needs to be adjusted to adjust the display brightness of the first display area AA1, which is also relatively simple in implementation.

[0079] In some optional embodiments, such as Figure 5 As shown, the voltage regulating unit 30 further includes a first control signal writing module 302 and a first storage module 303. The first control signal writing module 302 is electrically connected to the control end and the control signal end SW of the driving module 301, and is used to write the control signal of the control signal end SW into the control end of the driving module 301; the first storage module 303 is electrically connected to the control end of the driving module 301, and is used to maintain the potential of the control end of the driving module 301.

[0080] By setting the first control signal writing module 302, the time when the control signal of the control signal terminal SW is written into the control terminal of the driving module 301 can be controlled. By setting the first storage module 303, the potential of the control terminal of the driving module 301 can be maintained more stably.

[0081] In some optional embodiments, such as Figure 6 As shown, the driving module 301 includes a second transistor T2, the first control signal writing module 302 includes a third transistor T3, and the first storage module 303 includes a first capacitor C1. The first electrode of the second transistor T2 is electrically connected to the second end 222 of the second power line 22, and the second electrode of the second transistor T2 is electrically connected to the first power line 21; the gate of the third transistor T3 is electrically connected to the scan signal end SCAN, the first electrode of the third transistor T3 is electrically connected to the control signal end SW, and the second electrode of the third transistor T3 is electrically connected to the gate of the second transistor T2; the first electrode of the first capacitor C1 is electrically connected to the second end 222 of the second power line 22, and the second electrode of the first capacitor C1 is electrically connected to the gate of the second transistor T2.

[0082] The second transistor T2 and the third transistor T3 can be P-type transistors or N-type transistors. For example, the second transistor T2 and the third transistor T3 are P-type transistors. Figure 7 As shown, before each frame is displayed in the second display area AA2, that is, before the second display area AA2 is in the display state, the scan signal scan output by the scan signal terminal SCAN is at a low level, so that the third transistor T3 is turned on, and the control signal sw output by the control signal terminal SW is written into the gate of the second transistor T2.

[0083] In some optional embodiments, such as Figure 8As shown, the voltage regulating unit 30 further includes a second control signal writing module 304, a compensation module 306, an initialization module 307 and a second storage module 305. The second control signal writing module 304 is electrically connected to the input terminal of the driving module 301 and the control signal terminal SW, and is used to write the control signal of the control signal terminal SW into the control terminal of the driving module 301; the compensation module 306 is electrically connected to the output terminal and the control terminal of the driving module 301, and is used to detect and self-compensate for the threshold voltage deviation in the driving module 301; the initialization module 307 is electrically connected to the control terminal of the driving module 301 and the reference signal terminal VREF, and is used to initialize the control terminal of the driving module 301; the second storage module 305 is electrically connected to the control terminal of the driving module 301, and is used to maintain the potential of the control terminal of the driving module 301.

[0084] According to the embodiment of the present application, by setting the compensation module 306, it is possible to prevent the threshold voltage in the driving module from affecting the voltage on the first power line 21; by setting the initialization module 307, it is possible to prevent the potential of the control end of the driving module in the previous frame from affecting the potential of the subsequent frame.

[0085] In some optional embodiments, such as Fig. 9 As shown, the driving module 301 includes a fourth transistor T4, the second control signal writing module 304 includes a fifth transistor T5, the compensation module 306 includes a sixth transistor T6, the initialization module 307 includes a seventh transistor T7, and the second storage module 305 includes a second capacitor C2.

[0086] Among them, the first electrode of the fourth transistor T4 is electrically connected to the second end 222 of the second power line 22, and the second electrode of the fourth transistor T4 is electrically connected to the first power line 21; the gate of the fifth transistor T5 is electrically connected to the second scan signal terminal SCAN2, the first electrode of the fifth transistor T5 is electrically connected to the control signal terminal SW, and the second electrode of the fifth transistor T5 is electrically connected to the first electrode of the fourth transistor T4; the gate of the sixth transistor T6 is electrically connected to the second scan signal terminal SCAN2, the first electrode of the sixth transistor T6 is electrically connected to the second electrode of the fourth transistor T4, and the second electrode of the sixth transistor T6 is electrically connected to the gate of the fourth transistor T4; the gate of the seventh transistor T7 is electrically connected to the first scan signal terminal SCAN1, the first electrode of the seventh transistor T7 is electrically connected to the reference signal terminal VREF, and the second electrode of the seventh transistor T7 is electrically connected to the gate of the fourth transistor T4; the first electrode of the second capacitor C2 is electrically connected to the second end 222 of the second power line 22, and the second electrode of the second capacitor C2 is electrically connected to the gate of the fourth transistor T4.

[0087] The fourth transistor T4 to the seventh transistor T7 may be a P-type transistor or an N-type transistor. For example, the fourth transistor T4 to the seventh transistor T7 are P-type transistors. Fig.10 As shown, before each frame of the picture is displayed in the second display area AA2, that is, before the second display area AA2 is in the display state, the scanning signal scan1 output by the first scanning signal terminal SCAN1 is at a low level, so that the seventh transistor T7 is turned on to initialize the gate of the fourth transistor T4, and then the scanning signal scan2 output by the second scanning signal terminal SCAN2 is at a low level, the fifth transistor T5 and the sixth transistor T6 are turned on, and the control signal sw output by the control signal terminal SW is written into the gate of the fourth transistor T4, and the gate voltage of the fourth transistor T4 is finally sw+Vth, where Vth is the threshold voltage of the fourth transistor T4.

[0088] exist Figure 3 , Figure 6 and Fig. 9 In the structural diagram shown, the first transistor T1 , the second transistor T2 and the fourth transistor T4 are all driving transistors, and the on-state currents of the first transistor T1 , the second transistor T2 and the fourth transistor T4 are greater than the maximum light emitting current of the first display area AA1 .

[0089] The embodiment of the present application also provides a method for adjusting the brightness of a display panel, which is used to determine the voltage value of the control signal at the control signal terminal SW of the display panel as described in any of the above embodiments. Fig.11 As shown, the brightness adjustment method of the display panel provided in the embodiment of the present application includes steps 110 to 140.

[0090] Step 110 , setting the control signal at the control signal terminal to an initial voltage value, and performing gamma adjustment on the display panel to make the brightness of the first display area and the second display area consistent in each grayscale white screen.

[0091] Step 120 , under the initial voltage value, the first display area and the second display area are both made to display a first grayscale monochrome image, and it is determined whether the brightness difference between the first display area and the second display area is within a first preset range.

[0092] Step 130, if the brightness difference between the first display area and the second display area is not within the first preset range, the initial voltage value is adjusted to obtain a first voltage value, and under the first voltage value, the brightness difference between the first display area and the second display area is within the first preset range.

[0093] Step 140 , using the first voltage value as the voltage value of the control signal at the control signal terminal when both the first display area and the second display area display the first grayscale monochrome image.

[0094] According to the embodiments of the present application, it is possible to accurately determine the voltage value of the control signal at the control signal end required when the first display area and the second display area display the same first grayscale image, thereby avoiding the problem of consistent brightness of the first display area and the second display area under the white image and inconsistent brightness under the monochrome image due to the different voltage drops of the second power line under the white image and the monochrome image when the display panel actually displays the same first grayscale image, thereby improving the brightness consistency of the first display area and the second display area of ​​the display panel under the monochrome image.

[0095] In step 110, illustratively, the initial voltage value is -7V, and two gamma curves can be used to perform gamma adjustment on the first display area and the second display area of ​​the display panel under the same grayscale white screen. For example, the grayscale range displayed by the display panel is 0 to 255 grayscales, and the first display area and the second display area of ​​the display panel can both display a white screen of 255 grayscales, 128 grayscales, 96 grayscales, 64 grayscales, 32 grayscales or other grayscales, so that the display brightness of the first display area and the second display area is consistent, thereby determining the data voltage value (Vdata) corresponding to the first display area and the second display area at 0 to 255 grayscales.

[0096] The initial voltage value can be set according to actual conditions and is not limited to -7V.

[0097] Exemplarily, the first grayscale picture can be a first grayscale red picture, a first grayscale green picture or a first grayscale blue picture. The first grayscale can be any grayscale from 0 to 255. For example, if the first grayscale is 255 grayscale, then in step 120, the data voltages corresponding to the first display area and the second display area at 255 grayscale determined in step 110 are provided to the first display area and the second display area. It can be understood that the present application first determines the data voltage values ​​of the first display area and the second display area at each grayscale, and then keeps the data voltage values ​​unchanged, and adjusts the voltage value of the control signal at the control signal end to adjust the brightness of the first display area at each grayscale.

[0098] Exemplarily, the first preset range may be determined based on brightness differences that can be recognized by the human eye, and this application does not limit this.

[0099] In addition, it can be understood that in step 130 and step 140, if the brightness difference between the first display area and the second display area is within the first preset range, there is no need to adjust the initial voltage value. The initial voltage value can be directly used as the voltage value of the control signal at the control signal end when both the first display area and the second display area display the first grayscale monochrome image.

[0100] The inventors of the present application also discovered that, for example, when the first display area is always displaying the same picture, while the picture displayed in the second display area is constantly changing, the current in the second display area is constantly changing due to the continuous change in the picture displayed in the second display area. In other words, the voltage drop of the second power line is constantly changing, and thus the current in the first display area also changes with the change in the voltage drop of the second power line, resulting in unstable brightness of the first display area, for example, screen flickering may occur in the first display area.

[0101] In view of this, in some optional embodiments, such as Fig.12 As shown, the method for adjusting the brightness of a display panel provided in the embodiment of the present application may further include steps 150 to 170.

[0102] Step 150 , under the initial voltage value, the second display area displays the first grayscale monochrome picture and the first display area displays the second grayscale monochrome picture, and it is determined whether the difference between the brightness value of the first display area and the target brightness value is within a second preset range.

[0103] Step 160, if the difference between the measured brightness value and the target brightness value of the first display area is not within the second preset range, the initial voltage value is adjusted to obtain a second voltage value, and under the second voltage value, the difference between the brightness value and the target brightness value of the first display area is within the second preset range.

[0104] Step 170 , using the second voltage value as the voltage value of the control signal at the control signal terminal when the second display area displays the first grayscale monochrome picture and the first display area displays the second grayscale monochrome picture.

[0105] According to the embodiments of the present application, it is possible to accurately determine the voltage value of the control signal at the control signal end required when the first display area and the second display area display different images, thereby preventing the brightness of the first display area from changing due to the different voltage drops of the first power line when the first display area and the second display area of ​​the display panel actually display different images, thereby improving the stability of the display brightness of the first display area and avoiding screen flickering in the first display area.

[0106] In step 150, the first grayscale and the second grayscale can be any grayscale from 0 to 255. It is understood that the first grayscale is different from the second grayscale. For example, the first grayscale is 255, and the second grayscale can be any grayscale from 0 to 255 except 255.

[0107] In step 160 , the target brightness value is a theoretical brightness value corresponding to the first display area at the first grayscale.

[0108] In addition, the second preset range may be determined based on the brightness difference that can be recognized by the human eye, and this application does not limit this.

[0109] It can be understood that in step 160 and step 170, if the difference between the measured brightness value and the target brightness value of the first display area is within the second preset range, there is no need to adjust the initial voltage value. The initial voltage value can be directly used as the voltage value of the control signal at the control signal end when the second display area displays the first grayscale monochrome image and the first display area displays the second grayscale monochrome image.

[0110] In actual use of the display panel, the images displayed by the display panel are diverse. The first display area and the second display area of ​​the display panel do not only display monochrome images, but also display non-monochrome images. After the display panel is formed, the resistance of the second power line is constant, but the current in the second display area will change with the change of the display image, so that the voltage drop of the second power line will also change. Since the voltage drop of the second power line is different under different display images, the brightness of the first display area is unstable.

[0111] For this, in some optional embodiments, please continue to refer to Fig.12 The brightness adjustment method of the display panel provided in the embodiment of the present application may further include steps 180 to 190.

[0112] Step 180, dividing the display screen of the second display area into a plurality of first levels according to the maximum voltage drop of the second power line, and dividing the display screen of the first display area into a plurality of second levels; wherein the current of the second display area at each first level is different, and the current of the first display area at each second level is different;

[0113] Step 190, determining the correspondence between the first level, the second level and the voltage value of the control signal at the control signal terminal.

[0114] In step 180, illustratively, the maximum voltage drop of the second power line can be simulated based on the maximum brightness required by the second display area. For example, the maximum voltage drop of the second power line is 100mV. For example, within the voltage drop range of 5mV, the human eye cannot recognize the brightness change of the first display area. Then, 100mV can be divided into 20 equal parts based on 5mV, that is, the number of first levels is 20. For example, the voltage drop range of 95mV to 100mV corresponds to the first first level, and the second display area can also be called the main screen. Then the first first level can be recorded as the main screen G1 level. By analogy, the voltage drop range of 0 to 5mV corresponds to the twentieth first level main screen G20 level.

[0115] Of course, the voltage drop of the second power line may also be divided unequally, which is not limited in the present application.

[0116] It can be understood that the maximum voltage drop of the second power line is obtained based on the current of the second display area. Therefore, the voltage drop range corresponding to each first level is different, and the current range corresponding to each first level is also different. The current range corresponding to each first level and the current range corresponding to each second level can be preset. For example, under the main screen G1 level, the current range corresponding to the second display area is 290mA~300mA. This current range corresponds to monochrome pictures and non-monochrome pictures. For example, the current of a 250~255 grayscale monochrome picture is within this current range. That is to say, the grayscale range corresponding to the main screen G1 level can be 250~255 grayscale. In order to improve the efficiency of determining the voltage value of the control signal, the required voltage value of the control signal can be determined only under the monochrome picture.

[0117] In addition, the first display area can also be called a sub-screen. For example, the number of second levels is also 20, then the first display area corresponds to sub-screen level G1 to sub-screen level G20, and the grayscale range corresponding to each second level can be set according to actual conditions, and this application does not limit this.

[0118] As a specific example, the initial voltage value of the control signal output by the control signal terminal is -7V. As shown in Table 1, the first display area corresponds to the secondary screen G1 level to the secondary screen G20 level, and the second display area corresponds to the main screen G1 level to the main screen G20 level. For example, the grayscale range corresponding to the main screen G1 level can be 250 to 255 grayscales, and the grayscale range corresponding to the secondary screen G1 level can be 249 to 255 grayscales, so that the second display area can display a monochrome picture at any grayscale of 250 to 255 grayscales, and the first display area can display a monochrome picture of 255 grayscale, a monochrome picture of 254 grayscale... a monochrome picture of 249 grayscale in turn. For example, if the difference between the measured brightness value of the monochrome picture with grayscale of 255 to 250 displayed in the first display area and the target brightness value corresponding to grayscale of 255 to 250 is within the second preset range, it means that the initial voltage value of -7V can meet the requirement. If the difference between the measured brightness value of the monochrome picture with grayscale of 249 displayed in the first display area and the target brightness value corresponding to grayscale of 249 is not within the second preset range, it means that the initial voltage value of -7V cannot meet the requirement, then the initial voltage value is adjusted, and the adjusted initial voltage value is recorded as sw-1-1. When the picture displayed in the second display area is the main screen G1 level, the picture displayed in the first display area is the sub-screen G1 level, and the control signal output by the control signal terminal is sw-1-1, the display brightness of the first display area is relatively stable. According to the above method, the control signals sw-1-2 to sw-1-20 output by the control signal terminal corresponding to the main screen G1 level, sub-screen G2 level to sub-screen G20 level can be determined in sequence.

[0119] Similarly, for example, the grayscale range corresponding to the main screen level G2 can be grayscale 245 to 249, so that the second display area can display a monochrome image at any grayscale of 245 to 249, and in accordance with the above method, the control signals sw-2-1 to sw-2-20 outputted by the control signal terminal corresponding to the sub-screen level G1 to the sub-screen level G20 are determined in sequence. Of course, the control signals sw-3-1 to sw-20-20 outputted by the control signal terminal corresponding to the main screen level G3 to G20 and the sub-screen level G1 to the sub-screen level G20 can be determined in sequence in the above method.

[0120] Table 1

[0121]

[0122] In the above, the number of levels in which the first display area and the second display area are divided is taken as an example. In order to improve the debugging efficiency, the number of levels in which the first display area and the second display area are divided can be set to be smaller, and this application does not limit this.

[0123] Exemplarily, for each second level of the first display area, if each grayscale within the grayscale range corresponding to each second level is debugged, it will take a long time, so a number of grayscale binding points can be set, such as 5 to 20 grayscale binding points. Exemplarily, the number of second levels is 20, and each second level selects a grayscale picture for debugging to meet the brightness requirements of the first display area in most grayscales as much as possible while reducing the debugging time.

[0124] Exemplarily, after step 190, the control signal determination method provided in the embodiment of the present application may further include: storing the correspondence between the first level, the second level and the voltage value of the control signal at the control signal end in a storage module of the display panel.

[0125] Exemplarily, the driver chip of the display panel may have a screen classification function. For example, after receiving the screen to be displayed, the driver chip of the display panel may calculate the current corresponding to the first display area and the current corresponding to the second display area, and determine the second level corresponding to the first display area in multiple second levels (for example, the secondary screen G1 level to the secondary screen G20 level) according to the current corresponding to the first display area, and determine the first level corresponding to the second display area in multiple first levels (for example, the main screen G1 level to the main screen G20 level) according to the current corresponding to the second display area. Further, according to the correspondence between the first level, the second level and the voltage value of the control signal at the control signal end, the voltage value of the control signal end required is determined to ensure the accuracy of the display brightness of the first display area.

[0126] The present application also provides a display device, including the display panel provided by the present application. Fig.13 , Fig.13 It is a structural schematic diagram of a display device provided in an embodiment of the present application. Fig.13 The provided display device 1000 includes the display panel 100 provided by any of the above embodiments of the present application. Fig.13 The embodiment only takes a mobile phone as an example to illustrate the display device 1000. It can be understood that the display device provided in the embodiment of the present application can be a wearable product, a computer, a television, a car display device, or other display devices with display functions, and the present application does not make specific restrictions on this. The display device provided in the embodiment of the present application has the beneficial effects of the display panel provided in the embodiment of the present application. For details, please refer to the specific description of the display panel in the above embodiments, and this embodiment will not be repeated here.

[0127] Fig.14 A schematic diagram of the hardware structure of a brightness adjustment device for a display panel provided in an embodiment of the present application is shown.

[0128] The brightness adjustment device of the display panel may include a processor 901 and a memory 902 storing computer program instructions.

[0129] Specifically, the processor 901 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present invention.

[0130] The memory 902 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 902 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 902 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 902 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 902 is a non-volatile solid-state memory. In a specific embodiment, the memory 902 includes a read-only memory (ROM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0131] The processor 901 reads and executes computer program instructions stored in the memory 902 to implement any one of the brightness adjustment methods for the display panel in the above embodiments.

[0132] In one example, the brightness adjustment device of the display panel may further include a communication interface 903 and a bus 910. Fig.14 As shown, the processor 901, the memory 902, and the communication interface 903 are connected via a bus 910 and communicate with each other.

[0133] The communication interface 903 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiment of the present invention.

[0134] Bus 910 includes hardware, software or both, and the components of compensation voltage determination device are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 910 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0135] The brightness adjustment device of the display panel can execute the brightness adjustment method of the display panel in the embodiment of the present application, thereby realizing the combination of Fig.11 A method for adjusting the brightness of a display panel is described.

[0136] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the brightness adjustment method of the display panel in the above embodiment can be implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. Among them, the above-mentioned computer-readable storage medium may include a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), a disk or an optical disk, etc., which is not limited here.

[0137] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Computer-readable medium" can include any medium capable of storing or transmitting information. Examples of computer-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0138] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0139] According to the embodiments described above in the present application, these embodiments do not describe all the details in detail, nor do they limit the present application to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that: The display panel has a first display area and a second display area, wherein the pixel density of the first display area is smaller than the pixel density of the second display area, and the display panel comprises: A power supply unit, including a power output terminal; a first power line, electrically connected to the sub-pixels of the first display area; A second power line is electrically connected to the sub-pixel of the second display area; and Voltage regulation unit; Wherein, the first end of the second power line is electrically connected to the power output end, the second end of the second power line is electrically connected to the first power line through the voltage regulating unit, and the voltage regulating unit is used to regulate the voltage on the first power line; The voltage regulating unit comprises a driving module, a control end of the driving module is electrically connected to a control signal end, an input end of the driving module is electrically connected to a second end of the second power line, and an output end of the driving module is electrically connected to the first power line; The voltage regulating unit further comprises a first control signal writing module and a first storage module; wherein the first control signal writing module is electrically connected to the control end of the driving module and the control signal end, and is used to write the control signal of the control signal end into the control end of the driving module; The first storage module is electrically connected to the control end of the driving module and is used to maintain the potential of the control end of the driving module.

2. The display panel according to claim 1, characterized in that: The driving module includes a first transistor, a gate of the first transistor is electrically connected to the control signal terminal, a first electrode of the first transistor is electrically connected to the second end of the second power line, and a second electrode of the first transistor is electrically connected to the first power line.

3. The display panel according to claim 1, characterized in that: The driving module includes a second transistor, the first control signal writing module includes a third transistor, and the first storage module includes a first capacitor; wherein, A first electrode of the second transistor is electrically connected to a second end of the second power line, and a second electrode of the second transistor is electrically connected to the first power line; The gate of the third transistor is electrically connected to the scan signal terminal, the first electrode of the third transistor is electrically connected to the control signal terminal, and the second electrode of the third transistor is electrically connected to the gate of the second transistor; A first electrode of the first capacitor is electrically connected to a second end of the second power line, and a second electrode of the first capacitor is electrically connected to a gate of the second transistor.

4. The display panel according to claim 1, characterized in that: The voltage regulating unit further includes a second control signal writing module, a compensation module, an initialization module and a second storage module; wherein, The second control signal writing module is electrically connected to the input terminal of the driving module and the control signal terminal, and is used to write the control signal of the control signal terminal into the control terminal of the driving module; The compensation module is electrically connected to the output terminal and the control terminal of the driving module, and is used to detect and self-compensate for the threshold voltage deviation in the driving module; The initialization module is electrically connected to the control terminal and the reference signal terminal of the driving module, and is used to initialize the control terminal of the driving module; The second storage module is electrically connected to the control end of the driving module, and is used to maintain the potential of the control end of the driving module.

5. The display panel according to claim 4, characterized in that: The driving module includes a fourth transistor, the second control signal writing module includes a fifth transistor, the compensation module includes a sixth transistor, the initialization module includes a seventh transistor, and the second storage module includes a second capacitor; wherein, A first electrode of the fourth transistor is electrically connected to the second end of the second power line, and a second electrode of the fourth transistor is electrically connected to the first power line; The gate of the fifth transistor is electrically connected to the second scan signal terminal, the first electrode of the fifth transistor is electrically connected to the control signal terminal, and the second electrode of the fifth transistor is electrically connected to the first electrode of the fourth transistor; The gate of the sixth transistor is electrically connected to the second scanning signal terminal, the first electrode of the sixth transistor is electrically connected to the second electrode of the fourth transistor, and the second electrode of the sixth transistor is electrically connected to the gate of the fourth transistor; The gate of the seventh transistor is electrically connected to the first scanning signal terminal, the first electrode of the seventh transistor is electrically connected to the reference signal terminal, and the second electrode of the seventh transistor is electrically connected to the gate of the fourth transistor; A first electrode of the second capacitor is electrically connected to a second end of the second power line, and a second electrode of the second capacitor is electrically connected to a gate of the fourth transistor.

6. A method for adjusting the brightness of a display panel, characterized in that: The method for determining a voltage value of a control signal at a control signal terminal of a display panel according to any one of claims 1 to 5 comprises: Setting the control signal at the control signal end to an initial voltage value, and performing gamma adjustment on the display panel, so that the brightness of the first display area and the second display area under each grayscale white screen is consistent; Under the initial voltage value, the first display area and the second display area both display a first grayscale monochrome picture, and determine whether the brightness difference between the first display area and the second display area is within a first preset range; If the brightness difference between the first display area and the second display area is not within the first preset range, adjusting the initial voltage value to obtain a first voltage value, and under the first voltage value, the brightness difference between the first display area and the second display area is within the first preset range; The first voltage value is used as the voltage value of the control signal at the control signal end when both the first display area and the second display area display the first grayscale monochrome picture.

7. The method for adjusting the brightness of a display panel according to claim 6, wherein: The method further comprises: Under the initial voltage value, the second display area displays the first grayscale monochrome picture and the first display area displays the second grayscale monochrome picture, and it is determined whether the difference between the brightness value of the first display area and the target brightness value is within a second preset range; If the difference between the brightness value of the first display area and the target brightness value is not within the second preset range, the initial voltage value is adjusted to obtain a second voltage value, and under the second voltage value, the difference between the measured brightness value of the first display area and the target brightness value is within the second preset range; The second voltage value is used as the voltage value of the control signal at the control signal end when the second display area displays the first grayscale monochrome picture and the first display area displays the second grayscale monochrome picture.

8. The method for adjusting the brightness of a display panel according to claim 6, wherein: The method further comprises: According to the maximum voltage drop of the second power line, the display screen of the second display area is divided into a plurality of first levels, and the display screen of the first display area is divided into a plurality of second levels; wherein the current of the second display area at each of the first levels is different, and the current of the first display area at each of the second levels is different; A correspondence between the first level, the second level, and a voltage value of a control signal at the control signal terminal is determined.

9. A display device, characterized in that: The invention comprises a display panel according to any one of claims 1 to 5.

Images