Brightness compensation method of display panel and display panel

Abstract

The embodiment of the invention discloses a brightness compensation method for a display panel and the display panel, and the method comprises the steps: compensating the data voltage of a sub-pixel in a first display region according to the total current under a display picture of a first set frame in a full-refresh frame, and achieving the brightness compensation of the sub-pixel in the first display region in the full-refresh frame; and in the partial refresh frame, performing compensation adjustment on the light emitting duration of the sub-pixels in the first display subarea so as to perform brightness compensation on the sub-pixels in the first display subarea. Therefore, even if the data voltage corresponding to the sub-pixel in the first display partition cannot be compensated in the partial refresh frame, brightness compensation can be carried out on the sub-pixel by adjusting the light-emitting duration of the sub-pixel in the first display partition; the influence of load and total current change caused by display picture change in the second display subarea in the partial refresh frame on the brightness of the sub-pixels in the first display subarea is weakened, and the display effect is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a brightness compensation method for a display panel and a display panel. Background Art

[0002] With the development of display technology, users' requirements for picture display quality are getting higher and higher.

[0003] In the case of partitioned multi-frequency display on the display panel, when the image in the high-frequency refresh area changes, the brightness of the low-frequency refresh area will change, affecting the display effect. Summary of the invention

[0004] The present invention provides a brightness compensation method for a display panel and a display panel, so as to perform brightness compensation on a low-frequency refresh area, reduce the influence of picture changes in a high-frequency refresh area on the brightness of the low-frequency refresh area, and improve the display effect.

[0005] According to one aspect of the present invention, a brightness compensation method for a display panel is provided, wherein the display panel includes a first display partition and a second display partition, and in the case of partition multi-frequency display, the refresh frequency of the first display partition is lower than the refresh frequency of the second display partition; the method includes:

[0006] In a full refresh frame, the data voltage of the sub-pixels in the first display partition is compensated according to the total current under the display screen of the first setting frame; the full refresh frame is a writing frame of the first display partition and the second display partition, the first setting frame is before the full refresh frame, or the first setting frame includes the full refresh frame; the total current is equal to the sum of the driving currents corresponding to the sub-pixels in the display panel;

[0007] In the partial refresh frame, the luminous duration of the sub-pixels in the first display partition is compensated and adjusted to perform brightness compensation on the sub-pixels in the first display partition; the partial refresh frame is a hold frame for the first display partition and a write frame for the second display partition.

[0008] Optionally, in the full refresh frame, the data voltage of the sub-pixel in the first display partition is compensated according to the total current under the display picture of the first setting frame, including:

[0009] Obtaining the total current in the display screen of the first setting frame;

[0010] Determine the first compensation data voltage according to the total current and the out-of-plane resistance under the display picture of the first setting frame; wherein the display panel includes a power bus connecting the pixel circuit of the sub-pixel in the display area and the power supply in the non-display area, and the out-of-plane resistance is equal to the resistance of the power bus;

[0011] Compensating, according to the first compensation data voltage, an initial data voltage corresponding to a sub-pixel in the first display partition under a target display screen of a full refresh frame;

[0012] Optionally, the power bus is located in the non-display area;

[0013] Optionally, the first setting frame includes a display frame adjacent to the full refresh frame and before the full refresh frame.

[0014] Optionally, determining the first compensation data voltage according to the total current and the out-of-plane resistance includes:

[0015] Determine the product of the total current and the out-of-plane resistance under the display screen of the first setting frame as the first compensation data voltage;

[0016] Optionally, based on the first compensation data voltage, the initial data voltage corresponding to the sub-pixel in the first display partition of the target display screen of the full refresh frame is compensated, including: determining the difference between the initial data voltage and the first compensation data as the target data voltage, and providing the corresponding target data voltage to the sub-pixel in the first display partition within the full refresh frame.

[0017] Optionally, obtaining the total current in the display screen of the first setting frame includes:

[0018] The current on the power bus under the display panel in the first setting frame is obtained as the total current.

[0019] Optionally, obtaining the total current in the display screen of the first setting frame includes:

[0020] Acquire a display grayscale corresponding to each sub-pixel in the display panel under a display image of a first setting frame;

[0021] The driving current corresponding to the sub-pixel is determined according to the display gray scale corresponding to the sub-pixel, and the total current is determined according to the driving current corresponding to each sub-pixel.

[0022] Optionally, in a partial refresh frame, compensating and adjusting the light emission duration of the sub-pixels in the first display partition to perform brightness compensation on the sub-pixels in the first display partition includes:

[0023] The second compensation data voltage is determined according to the total current corresponding to the display picture of the second setting frame; the second setting frame is before the partial refresh frame, and / or the second setting frame includes the partial refresh frame;

[0024] Determine the compensated luminous duration according to the corresponding relationship between the difference between the second compensated data voltage and the first compensated data voltage corresponding to the full refresh frame before the partial refresh frame and the luminous duration compensation amount;

[0025] According to the compensated luminous duration, the initial luminous duration corresponding to the sub-pixel in the first display partition is compensated to perform brightness compensation on the sub-pixel in the first display partition;

[0026] Optionally, the second set frame is a display frame adjacent to the partial refresh frame and before the partial refresh frame;

[0027] Optionally, the compensated luminous duration is determined according to a difference between the second compensated data voltage and the first compensated data voltage corresponding to the full refresh frame before the partial refresh frame and closest to the partial refresh frame, and a corresponding relationship with the luminous duration compensation amount;

[0028] Optionally, in a partial refresh frame, at the same display grayscale, the light emitting durations corresponding to the sub-pixels in the first display partition and the sub-pixels in the second display partition are different.

[0029] Optionally, the display panel further includes a pixel circuit, the pixel circuit is electrically connected to the sub-pixel correspondingly; the pixel circuit includes a driving module and a light-emitting control module, the driving module and the light-emitting control module are connected in series between the power line and the sub-pixel; the light-emitting duration compensation amount includes a duty cycle compensation amount for the light-emitting control signal of the light-emitting control module;

[0030] Determining the compensated luminous duration according to the difference between the second compensated data voltage and the first compensated data voltage corresponding to the full refresh frame before the partial refresh frame and the corresponding relationship with the luminous duration compensation amount includes:

[0031] Determine the compensation duty cycle according to the corresponding relationship between the difference between the second compensation data voltage and the first compensation data voltage corresponding to the full refresh frame before the partial refresh frame and the duty cycle compensation amount;

[0032] According to the compensated luminous duration, the initial luminous duration corresponding to the sub-pixel in the first display partition is compensated to perform brightness compensation on the sub-pixel in the first display partition, including:

[0033] The initial duty cycle corresponding to the sub-pixels in the first display partition is compensated according to the compensation duty cycle, so as to perform brightness compensation on the sub-pixels in the first display partition.

[0034] Optionally, the brightness compensation method of the display panel further includes:

[0035] In a partial refresh frame, the data voltages of the sub-pixels in the second display partition are compensated according to the second compensated data voltage.

[0036] Optionally, the brightness compensation method of the display panel further includes:

[0037] In the full refresh frame, the data voltage of the sub-pixel in the second display partition is compensated according to the total current under the display picture of the first setting frame;

[0038] Optionally, in the case of non-partitioned multi-frequency display and a full refresh frame of partitioned multi-frequency display, at the same display grayscale, the compensation data voltages corresponding to the sub-pixels in the first display partition and the second display partition are the same.

[0039] According to another aspect of the present invention, a display panel is provided, and brightness compensation is performed using the brightness compensation method for a display panel according to any embodiment of the present invention.

[0040] The brightness compensation method and display panel of the display panel of the present embodiment can realize brightness compensation of sub-pixels in the first display partition in the full refresh frame by compensating the data voltage of sub-pixels in the first display partition according to the total current under the display picture of the first setting frame in the full refresh frame; in the partial refresh frame, the light emission duration of sub-pixels in the first display partition is compensated and adjusted to perform brightness compensation on sub-pixels in the first display partition. In this way, it can be ensured that even if the data voltage corresponding to the sub-pixels in the first display partition cannot be compensated in the partial refresh frame, the brightness of the sub-pixels can be compensated by adjusting the light emission duration of the sub-pixels in the first display partition, and the influence of the load and total current changes caused by the display picture changes in the second display partition in the partial refresh frame on the brightness of the sub-pixels in the first display partition is reduced, thereby improving the display effect.

[0041] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0044] Figure 2 is a flow chart of a brightness compensation method for a display panel provided by an embodiment of the present invention;

[0045] Figure 3 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0046] Figure 4 yes Figure 3 The equivalent circuit diagram of the display panel shown;

[0047] Figure 5 is a flow chart of another brightness compensation method for a display panel provided by an embodiment of the present invention;

[0048] Figure 6is a flow chart of another brightness compensation method for a display panel provided by an embodiment of the present invention;

[0049] Figure 7 It is a structural schematic diagram of a pixel circuit in the related art;

[0050] Figure 8 It is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] As described in the background technology, when the display panel is in a partitioned multi-frequency display, when the picture in the high-frequency refresh area changes, the brightness of the low-frequency refresh area will change, affecting the display effect. The inventors have found that when the refresh frequency of the high-frequency refresh area is higher than that of the low-frequency refresh area, and the high-frequency refresh area is refreshed while the low-frequency refresh area is not refreshed, if the picture in the high-frequency refresh area changes, the load corresponding to the high-frequency refresh area changes, and the sub-pixels in the high-frequency refresh area and the low-frequency refresh area are connected to the same power line, the total current on the power line will be different. Due to the resistance of the power line, different total currents cause different voltage drops on the power line, resulting in different voltages actually received by the sub-pixels in the low-frequency refresh area transmitted by the power line, which ultimately causes the brightness of the low-frequency refresh area to change, affecting the display effect.

[0054] Based on the above reasons, an embodiment of the present invention provides a brightness compensation method for a display panel. Figure 1is a schematic diagram of a display panel provided by an embodiment of the present invention, with reference to Figure 1 , the display panel includes a first display partition AA1 and a second display partition AA2. In the case of partition multi-frequency display, the refresh frequency of the first display partition AA1 is lower than the refresh frequency of the second display partition AA2. Among them, the first display partition AA1 and the second display partition AA2 are arranged along the extension direction of the data line in the display panel, and the data line is used to transmit the data voltage. According to different display images, the positions of the first display partition AA1 and the second display partition AA2 in the display panel are variable, and the areas of the first display partition AA1 and the second display partition AA2 are also variable. It should be noted that the number of display partitions AA0 included in the display panel is not limited to the first display partition AA1 and the second display partition AA2. The display panel may also include more display partitions AA0, such as at least three display partitions AA0, which is not specifically limited in the embodiment of the present invention. In the embodiment of the present invention, in the case of partition multi-frequency display, the first display partition AA1 and the second display partition AA2 are any two display partitions AA0 with different refresh frequencies among the at least two display partitions AA0 included in the display panel, the first display partition AA1 is a low-frequency refresh area, and the second display partition AA2 is a high-frequency refresh area.

[0055] Figure 2 : is a flow chart of a brightness compensation method of a display panel provided by an embodiment of the present invention, comprising:

[0056] S110 , in a full refresh frame, compensating the data voltages of the sub-pixels in the first display subarea according to the total current of the display image of the first setting frame.

[0057] The full refresh frame is a writing frame of the first display partition and the second display partition.

[0058] In an embodiment of the present invention, for the entire display panel, the display frames for displaying the screen on the display panel are divided into two types, one of which is a full refresh frame and the other is a partial refresh frame. In the full refresh frame, each display partition in the display panel performs screen refresh, that is, the sub-pixels in each display partition in the display panel will write data voltages. In the partial refresh frame, at least one display partition in the display panel performs screen refresh, and at least one display partition does not perform screen refresh. For a display partition, the display frames are also divided into two types, one of which is a write frame and the other is a hold frame. Among them, for a display partition, in the write frame, the sub-pixels in the display partition will write data voltages; in the hold frame, the sub-pixels in the display partition will not write data voltages.

[0059] In this step, when brightness compensation is performed on the sub-pixels in the first display partition in the full refresh frame, the data voltage corresponding to the sub-pixels in the first display partition is compensated according to the total current under the display screen of the first setting frame, wherein the total current is equal to the sum of the driving currents corresponding to the sub-pixels in the display panel.

[0060] In an optional embodiment, the first setting frame is before the full refresh frame. In this case, the data voltage of the sub-pixels in the first display partition can be compensated according to the total current under the display screen of the display frame before the full refresh frame. Optionally, the first setting frame includes a display frame adjacent to the full refresh frame and before the full refresh frame. Because the display screens corresponding to adjacent display frames are relatively close, correspondingly, the total current under the display screens corresponding to adjacent display frames will also be relatively close. Therefore, the brightness of the sub-pixels in the first display partition is compensated according to the total current corresponding to the display screen of the display frame before the full refresh frame and adjacent to the full refresh frame. Specifically, the brightness compensation of the sub-pixels is achieved by compensating the data voltage corresponding to the sub-pixels, ensuring that the brightness compensation of the sub-pixels can be performed more accurately.

[0061] In another optional embodiment of the present invention, the first setting frame includes a full refresh frame. In this case, in the full refresh frame, the data voltage of the sub-pixel in the first display partition can be compensated according to the total current under the display screen of the full refresh frame. Optionally, the total current under the display screen of the full refresh frame is estimated in advance, and the data voltage of the sub-pixel in the first display partition is compensated according to the total current under the display screen of the full refresh frame estimated in advance, so as to avoid the hysteresis of brightness compensation of the sub-pixel in the first display partition according to the total current actually measured in the full refresh frame.

[0062] S120 . In a partial refresh frame, compensating and adjusting the light emission duration of the sub-pixels in the first display partition to perform brightness compensation on the sub-pixels in the first display partition.

[0063] As described above, the partial refresh frame is a hold frame of the first display partition and is a write frame of the second display partition.

[0064] Specifically, in the partial refresh frame, the sub-pixels in the first display partition do not perform data writing, and the sub-pixels in the second display partition perform data writing, so it is impossible to achieve brightness compensation for the sub-pixels in the first display partition by adjusting the data voltage of the sub-pixels in the first display partition. In this step, in the partial refresh frame, the light emission duration of the sub-pixels in the first display partition is adjusted, so that in the partial refresh frame, when the total current changes due to the load change caused by the change of the display screen in the second display partition, the brightness compensation for the sub-pixels in the first display partition is achieved by adjusting the light emission duration of the sub-pixels in the first display partition. Wherein, in the case where the brightness of the sub-pixels in the first display partition becomes darker due to the increase of the load in the second display partition, the brightness of the sub-pixels can be increased by extending the light emission duration of the sub-pixels in the first display partition in the partial refresh frame to achieve brightness compensation; in the case where the brightness of the sub-pixels in the first display partition becomes brighter due to the decrease of the load in the second display partition, the brightness of the sub-pixels can be reduced by shortening the light emission duration of the sub-pixels in the first display partition in the partial refresh frame to achieve brightness compensation.

[0065] The brightness compensation method of the display panel of the present embodiment can realize brightness compensation of the sub-pixels in the first display partition in the full refresh frame by compensating the data voltage of the sub-pixels in the first display partition according to the total current under the display screen of the first setting frame in the full refresh frame; in the partial refresh frame, the light emission duration of the sub-pixels in the first display partition is compensated and adjusted to perform brightness compensation on the sub-pixels in the first display partition. In this way, it can be ensured that even if the data voltage corresponding to the sub-pixels in the first display partition cannot be compensated in the partial refresh frame, the brightness of the sub-pixels can be compensated by adjusting the light emission duration of the sub-pixels in the first display partition, and the influence of the load and total current changes caused by the display screen changes in the second display partition in the partial refresh frame on the brightness of the sub-pixels in the first display partition is reduced, thereby improving the display effect.

[0066] Figure 3 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Figure 4 yes Figure 3 The equivalent circuit diagram of the display panel is shown. Figure 3 and Figure 4 Optionally, the display panel includes a power bus 21 connecting a pixel circuit of an AA sub-pixel in a display area and a power source 20 in a non-display area NAA, and an out-of-plane resistance is equal to a resistance of the power bus 21.

[0067] refer to Figure 3 and Figure 4The pixel circuit of the sub-pixel includes a power input terminal IN, and the power input terminals IN of the pixel circuit are connected to each other. The display panel includes a power supply 20, and the power supply 20 is connected to the power input terminals IN of each sub-pixel 10 through a power bus 21. Optionally, the power bus 21 is located in the non-display area, and the resistance of the power bus 21 is equal to the out-of-plane resistance R0. Figure 3 and Figure 4 exemplarily shows that the sub-pixel 10 in the display panel includes three types, namely, red sub-pixel 11, green sub-pixel 12 and blue sub-pixel 13, and the corresponding light-emitting devices are red light-emitting device R, green light-emitting device G and blue light-emitting device B, respectively, and the light-emitting device includes a first electrode, a light-emitting layer and a second electrode arranged in a stacked manner, wherein the first electrode can be an anode of the light-emitting device, and the second electrode can be a cathode of the light-emitting device. The second electrodes of the light-emitting devices are connected to each other and to a fixed voltage ELVSS. Figure 4 Schematically shows a driving transistor included in the pixel circuit, the first electrode of the driving transistor serves as the power input terminal IN of the pixel circuit, and the second electrode of the driving transistor is electrically connected to the first electrode of the light emitting device. Figure 3 and Figure 4 In the display panel shown, the current flowing through the out-of-plane resistor is I=I1+I2+I3, where I is the total current flowing through the out-of-plane resistor, that is, the total current flowing through the power bus 21, I1 is the first total current corresponding to the parallel red sub-pixels 11, I2 is the second total current corresponding to the parallel green sub-pixels 12, and I3 is the third total current corresponding to the parallel blue sub-pixels 13.

[0068] Due to the existence of the off-plane resistor, when the picture in the second display partition changes and the total current changes, the voltage drop of the off-plane resistor will change. Accordingly, the power supply voltage ELVDD output by the power supply 20 passes through the off-plane resistor and reaches the power supply voltage (actual power supply voltage RealELVDD) at the power input end of the sub-pixel in the first display partition. The power supply voltage will change, which will eventually cause the second display partition to refresh the picture while the first display partition does not refresh the picture. The brightness of the sub-pixel in the first display partition will change with the change of the picture in the second display partition. The brightness compensation method of the display panel of any embodiment of the present invention can write a frame in the part where the second display partition refreshes the picture and the first display partition does not refresh the picture, and adjust the light emission time of the sub-pixel in the first display partition to perform brightness compensation to improve the display effect.

[0069] Figure 5 is a flowchart of another brightness compensation method for a display panel provided by an embodiment of the present invention, referring to Figure 5 , the brightness compensation method of the display panel includes:

[0070] S210 , obtaining a total current in a display screen of a first setting frame.

[0071] In an optional embodiment, S210 includes obtaining the current on the power bus under the display panel of the first setting frame as the total current. Optionally, when the out-of-plane resistance corresponding to the power bus is known, the total current can be determined by obtaining the voltage on the power bus and according to the quotient of the voltage on the power bus and the out-of-plane resistance. In addition, the total current can also be obtained by directly detecting the current on the power bus.

[0072] In another optional embodiment, S210 includes obtaining the display grayscale corresponding to each sub-pixel in the display panel under the display image of the first set frame; determining the driving current corresponding to the sub-pixel according to the display grayscale corresponding to the sub-pixel, and determining the total current according to the driving current corresponding to each sub-pixel.

[0073] Specifically, there is a corresponding relationship between the display grayscale corresponding to the sub-pixel and the driving current, and the corresponding relationship between the display grayscale and the driving current can be obtained in advance. In some optional embodiments, the corresponding relationship between the display grayscale and the driving current can be a formula relationship. In other optional embodiments, the corresponding relationship between the display grayscale and the driving current can be in the form of a lookup table. After determining the display grayscale corresponding to the sub-pixel in the first setting frame, the driving current corresponding to the sub-pixel can be determined according to the display grayscale and the corresponding relationship between the display grayscale and the driving current.

[0074] In some optional embodiments, the display grayscale corresponding to each sub-pixel in the display panel under the display screen of the first setting frame can be obtained from the processor of the display device, wherein the display data corresponding to each frame of the display screen in the display panel can be sent by the processor to the driver chip of the display panel. Among them, the display data corresponding to a frame of the display screen includes the display grayscale corresponding to each sub-pixel under the frame of the display screen. The method of obtaining the display grayscale of the sub-pixel under the display screen of the first setting frame from the processor can be applicable to the two cases that the first setting frame is in a full refresh frame and the first setting frame includes a full refresh frame. Among them, in the case where the first setting frame includes a full refresh frame, the display grayscale corresponding to each sub-pixel under the display screen of the full refresh frame can be obtained from the processor in advance in the display screen of the full refresh frame, so as to estimate the total current under the display screen of the full refresh frame before the full refresh frame is displayed, and the data voltage of the sub-pixels in the first display partition is compensated according to the estimated total current when the full refresh frame is actually displayed, so as to avoid the lag of compensation. In the case where the first setting frame is before the full refresh frame, before the full refresh frame displays the picture, the display data corresponding to the first setting frame has been transmitted from the processor to the driver chip. The driver chip can directly determine the corresponding total current based on the display data of the first setting frame, and then perform brightness compensation for the sub-pixels under the full refresh frame according to the corresponding total current under the display picture of the first setting frame.

[0075] S220 , determining a first compensation data voltage according to a total current and an out-of-plane resistance in a display image of a first setting frame.

[0076] Specifically, the brightness of the sub-pixel is positively correlated to the driving current corresponding to the sub-pixel, and the driving current is (ELVDD-IR0-Vdata) 2 There is a positive correlation, where ELVDD represents the power supply voltage output by the power supply, Vdata represents the data voltage before compensation, R0 represents the out-of-plane resistance, and I represents the total current. Therefore, in some optional embodiments, the product of the total current and the out-of-plane resistance under the display screen of the first setting frame is determined as the first compensation data voltage. In other optional embodiments, considering that in addition to the out-of-plane resistance, there will also be a voltage drop on the power line 22 in the display area connected to the power bus 21, the first compensation voltage can be determined by multiplying the product of the total current and the out-of-plane resistance by a certain coefficient according to the position of the sub-pixel in the display panel. Among them, the farther the sub-pixel is from the power supply, the larger the coefficient.

[0077] S230 , compensating the initial data voltage corresponding to the sub-pixel in the first display subarea of ​​the target display screen of the full refresh frame according to the first compensation data voltage.

[0078] The initial data voltage is a data voltage corresponding to the grayscale displayed before brightness compensation is performed on the sub-pixel in the target display screen of the full refresh frame. In this step, the target data voltage can be determined according to the first compensation voltage corresponding to the sub-pixel and the initial data voltage, and the corresponding target data voltage is provided to the sub-pixel in the first display partition in the full refresh frame to achieve brightness compensation for the sub-pixel.

[0079] Optionally, S230 includes: determining a difference between the initial data voltage and the first compensation data as a target data voltage, and providing corresponding target data voltages to sub-pixels in the first display partition within a full refresh frame.

[0080] As mentioned above, the driving current corresponding to the sub-pixel is (ELVDD-IR0-Vdata) 2 Positive correlation, where Vdata is the initial data voltage before compensation. After compensating the initial data voltage, the driving current is (ELVDD-Vdata) 2 Positive correlation means that even if the total current changes due to the change of the display image in the second display partition within a partial refresh frame, the current of the sub-pixel in the first display partition will not change, so that the luminous brightness of the sub-pixel in the first display partition will not change with the change of the image in the second display partition, thereby improving the display effect.

[0081] S240 . In a partial refresh frame, compensating and adjusting the light emission duration of the sub-pixels in the first display partition to perform brightness compensation on the sub-pixels in the first display partition.

[0082] Figure 6 is a flowchart of another brightness compensation method for a display panel provided by an embodiment of the present invention, referring to Figure 6 , the brightness compensation method of the display panel includes:

[0083] S310 , in a full refresh frame, compensating data voltages of sub-pixels in a first display subarea according to a total current in a display image of a first setting frame.

[0084] S320 , determining a second compensation data voltage according to a total current corresponding to a display image of a second setting frame.

[0085] The second setting frame is before the partial refresh frame, and / or the second setting frame includes the partial refresh frame. Optionally, the second setting frame is a display frame adjacent to the partial refresh frame and before the partial refresh frame.

[0086] In some optional embodiments, the display grayscale corresponding to each sub-pixel in the display panel under the display screen of the second setting frame can be obtained from the processor of the display device, wherein the display data corresponding to each frame of the display screen in the display panel can be sent by the processor to the driver chip of the display panel. The method of obtaining the display grayscale of the sub-pixel under the display screen of the second setting frame from the processor can be applicable to the two cases where the second setting frame is in a partial refresh frame and the second setting frame includes a partial refresh frame. Among them, in the case where the second setting frame includes a partial refresh frame, the display grayscale corresponding to each sub-pixel under the display screen of the partial refresh frame can be obtained from the processor in advance in the display screen of the partial refresh frame, so as to estimate the total current under the display screen of the partial refresh frame before the partial refresh frame is displayed, and the data voltage of the sub-pixels in the second display partition is compensated when the partial refresh frame is actually displayed according to the estimated total current, so as to avoid compensation lag. In the case where the second setting frame is before the partial refresh frame, before the partial refresh frame displays the picture, the display data corresponding to the second setting frame has been transmitted from the processor to the driver chip, then the driver chip can directly determine the corresponding total current according to the display data of the second setting frame, and then perform brightness compensation for the sub-pixels under the partial refresh frame according to the corresponding total current under the display picture of the second setting frame.

[0087] In some optional embodiments, the product of the total current and the out-of-plane resistance under the display screen of the second setting frame is determined as the second compensation data voltage. In other optional embodiments, considering that in addition to the out-of-plane resistance, there is also a voltage drop on the power line 22 in the display area connected to the power bus 21, the second compensation voltage can be determined by multiplying the product of the total current and the out-of-plane resistance by a certain coefficient according to the position of the sub-pixel in the display panel. The farther the sub-pixel is from the power source, the larger the coefficient is.

[0088] S330, determining the compensated luminous duration according to the difference between the second compensated data voltage and the first compensated data voltage corresponding to the full refresh frame before the partial refresh frame, and the corresponding relationship between the luminous duration compensation amount.

[0089] Specifically, in the partial refresh frame, the sub-pixels in the first display partition will not write data voltages, but will maintain the data voltages corresponding to the full refresh frame that is before the partial refresh frame and closest to the partial refresh frame. In the partial refresh frame, the second compensation data voltage corresponding to the sub-pixels in the first display partition cannot be compensated to the sub-pixels in the first display partition. In this step, the corresponding relationship between the data voltage difference and the luminous duration compensation amount can be obtained in advance, wherein the data voltage difference is the difference between the second compensation data voltage and the first compensation data voltage. The corresponding relationship between the data voltage difference and the luminous duration compensation amount can be obtained by multiple tests on the display panel, and then the compensated luminous duration is determined based on the data voltage difference and the luminous duration compensation amount, and the difference between the second compensation data voltage and the first compensation data voltage.

[0090] Optionally, S330 includes determining the compensated luminous duration according to a correspondence between a difference between the second compensated data voltage and a first compensated data voltage corresponding to a full refresh frame before the partial refresh frame and closest to the partial refresh frame and the luminous duration compensation amount.

[0091] S340 , compensating the initial light emitting duration corresponding to the sub-pixels in the first display partition according to the compensated light emitting duration, so as to perform brightness compensation on the sub-pixels in the first display partition.

[0092] Among them, the initial luminous duration is the luminous duration before the luminous duration compensation is performed. The initial luminous durations corresponding to the sub-pixels in the first display partition and the second display partition are the same. In this step, the target luminous duration is obtained according to the compensated luminous duration and the initial luminous duration. In the partial refresh frame, the luminous duration of the sub-pixels in the first display partition is controlled to be the target luminous duration, and the luminous duration of the sub-pixels in the second display partition is controlled to be the initial luminous duration, so as to realize compensation for the luminous duration of the sub-pixels in the first display partition. Optionally, in the partial refresh frame, under the same display grayscale, the luminous durations corresponding to the sub-pixels in the first display partition and the sub-pixels in the second display partition are different, and then in the partial refresh frame, the brightness compensation of the sub-pixels in the first display partition is realized by compensating for the luminous duration of the sub-pixels in the first display partition.

[0093] Optionally, the brightness compensation method of the display panel further includes compensating the data voltage of the sub-pixel in the second display partition according to the second compensation data voltage in a partial refresh frame. In this way, it can be ensured that the brightness of the sub-pixel in the second display partition will not be affected by the out-of-plane resistance voltage drop, further improving the display effect.

[0094] The display panel also includes a pixel circuit, Figure 7 It is a structural diagram of a pixel circuit in the related art, and the pixel circuit is electrically connected to the sub-pixel. Optionally, the pixel circuit includes a driving module and a light-emitting control module, and the driving module and the light-emitting control module are connected in series between the power line and the sub-pixel (wherein the power line is electrically connected to the power bus 21, and the power line can be located in the display area of ​​the display panel); the light-emitting duration compensation amount includes a duty cycle compensation amount for the light-emitting control signal EM of the light-emitting control module. Optionally, S330 includes: determining the compensation duty cycle according to the difference between the second compensation data voltage and the first compensation data voltage corresponding to the full refresh frame before the partial refresh frame, and the corresponding relationship with the duty cycle compensation amount; S340 includes compensating the initial duty cycle corresponding to the sub-pixel of the first display partition according to the compensated duty cycle, so as to perform brightness compensation on the sub-pixels in the first display partition.

[0095] Combination Figure 7 , the driving module may include a driving transistor DT, the sub-pixel includes a light-emitting device D1, and the light-emitting control module may include a first light-emitting control transistor T1 and a second light-emitting control transistor T2, the first light-emitting control transistor T1 is connected between the power supply 20 and the first end of the driving module, and the second light-emitting control transistor T2 is connected between the second end of the driving module and the first electrode of the light-emitting device D1. The gates of the first light-emitting control transistor T1 and the second light-emitting control transistor T2 are connected to the light-emitting control signal EM, and the light-emitting duration of the light-emitting device D1 within a display frame can be controlled by controlling the duty cycle of the light-emitting control signal EM. In this way, the light-emitting duration of the sub-pixels in the first display partition is compensated by compensating the duty cycle of the light-emitting control signal EM, and then the brightness of the sub-pixels in the first display partition is compensated.

[0096] Optionally, the pixel circuit further includes a data writing module, a compensation module, a first initialization module and a second initialization module, wherein the control ends of the first initialization module and the second initialization module are connected to the first scanning signal Scan1, the first end of the first initialization module is connected to the initialization signal line Vref, and the second end of the first initialization module is electrically connected to the control end of the driving module. The first end of the second initialization module is connected to the initialization signal line, the second end of the second initialization module is electrically connected to the first pole of the light-emitting device D1, and the second end of the light-emitting device D1 is connected to a fixed voltage. The control ends of the data writing module and the compensation module are connected to the second scanning signal Scan2, the first end of the data writing module is connected to the data line Data, the first end of the data writing module is electrically connected to the first end of the driving module, and the compensation module is connected between the control end of the driving module and the second end of the driving module. The pixel circuit further includes a storage module, which is used to store the potential of the control end of the driving module, and the storage module includes a storage capacitor Cst. The data writing module includes a data writing transistor T3, the compensation module includes a compensation transistor T4, the first initialization module includes a first initialization transistor T5, and the second initialization module includes a second initialization transistor T6.

[0097] The working process of the pixel circuit in a display frame includes an initialization stage, a data writing stage and a light-emitting stage. In the initialization stage, the first scanning signal Scan1 is at an effective level, the first initialization module and the second initialization module are turned on, and the control end of the driving module and the first electrode of the light-emitting device D1 are initialized respectively. In the data writing stage of the writing frame, the second scanning signal Scan2 is at an effective level, the data writing module and the compensation module are turned on, and the data voltage is written to the control end of the driving module through the data writing module and the compensation module. In the data writing stage of the holding frame, the second scanning signal Scan2 is at an invalid level, the data writing module and the compensation module are turned off, and the data voltage is not written. In the light-emitting stage, the light-emitting control signal EM is at an effective level, and the light-emitting device D1 is lit. In the holding frame of the first display partition, by adjusting the duration of the effective level of the light-emitting control signal EM, the light-emitting brightness of the sub-pixels in the first display partition can be compensated to improve the display effect.

[0098] Based on the above embodiments of the present invention, optionally, the brightness compensation method of the display panel further includes: in a full refresh frame, compensating the data voltage of the sub-pixel in the second display partition according to the total current under the display picture of the first setting frame.

[0099] In some optional embodiments, the data voltage of the sub-pixels in the second display partition may be compensated according to a first compensation data voltage determined by multiplying the total current and the out-of-plane resistance in the display image of the first setting frame.

[0100] Optionally, in the case of non-partitioned multi-frequency display and a full refresh frame of partitioned multi-frequency display, at the same display grayscale, the compensation data voltages corresponding to the sub-pixels in the first display partition and the second display partition are the same.

[0101] Table 1 takes three display frames (Frame 1, Frame 2 and Frame 3) as examples to illustrate the compensation data voltages corresponding to the sub-pixels in the first display partition and the second display partition in the full refresh frame and the partial refresh frame.

[0102] In Frame1, the refresh frequencies corresponding to the first display partition and the second display partition are both 60Hz, and the first display partition and the second display partition both perform screen refresh, that is, Frame1 is a full refresh frame, and accordingly, the first compensation data voltage corresponding to the sub-pixel in the first display partition is the same as the second compensation data voltage corresponding to the sub-pixel in the second display partition. Exemplarily, the first compensation data voltage and the second compensation data voltage are both △Vdata, and the luminescence duration corresponding to the sub-pixel in the first display partition and the second display partition is the same. Exemplarily, the luminescence duration corresponding to the sub-pixel in the first display partition and the second display partition is both EM-t1.

[0103] In Frame2, the refresh frequency corresponding to the first display partition is 1 Hz, and the refresh frequency corresponding to the second display partition is 60 Hz, and the screen is refreshed in both the first display partition and the second display partition of Frame2, that is, Frame2 is a full refresh frame, and accordingly, the first compensation data voltage corresponding to the sub-pixel in the first display partition and the second compensation data voltage corresponding to the second display partition are the same. Exemplarily, the first compensation data voltage and the second compensation data voltage are both △Vdata1 (according to the different total currents of the display screen of the first setting frame corresponding to Frame1 and the first setting frame corresponding to Frame2, the sizes of △Vdata1 and △Vdata may be different; according to the same total currents of the display screen of the first setting frame corresponding to Frame1 and the first setting frame corresponding to Frame2, the sizes of △Vdata1 and △Vdata may be the same), and the luminescence durations corresponding to the sub-pixels in the first display partition and the second display partition are the same. Exemplarily, the luminescence durations corresponding to the sub-pixels in the first display partition and the second display partition are both EM-t1.

[0104] In Frame3, the refresh frequency corresponding to the first display partition is 1Hz, and the refresh frequency corresponding to the second display partition is 60Hz. In Frame3, the first display partition does not refresh the screen, and the second display partition refreshes the screen, that is, Frame3 is a partial refresh frame. In this case, the first compensation data voltage corresponding to the sub-pixel in the first display partition remains as △Vdata1 of the previous full refresh frame, and the corresponding second compensation data voltage in the second display partition is △Vdata2 (△Vdata2 and △Vdata1 may be different). In response, the brightness of the sub-pixel in the first display partition can be compensated by the luminous duration corresponding to the sub-pixel in the first display partition. Exemplarily, the luminous duration corresponding to the sub-pixel in the first display partition is EM-t2, and the luminous duration corresponding to the sub-pixel in the second display partition is EM-t1. The durations of EM-t2 and EM-t1 may be different.

[0105] Table 1

[0106]

[0107] The embodiment of the present invention further provides a display panel, which can refer to Figure 1 The display panel performs brightness compensation using the brightness compensation method for the display panel of any of the above embodiments of the present invention.

[0108] Optionally, the display panel includes a gate driving circuit 30 electrically connected to the display partitions AA0 in a one-to-one correspondence. Figure 8 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Figure 8 Optionally, the first gate driving circuit 31 and the second gate driving circuit 32, the first gate driving circuit 31 is electrically connected to the pixel circuit of the sub-pixel in the first display partition AA1, and is used to provide a light-emitting control signal to the pixel circuit of the sub-pixel in the first display partition AA1; the second gate driving circuit 32 is electrically connected to the pixel circuit of the sub-pixel in the second display partition AA2, and is used to provide a light-emitting control signal to the pixel circuit of the sub-pixel in the second display partition AA2. In this way, when the light-emitting durations corresponding to the sub-pixels in the first display partition AA1 and the second display partition AA2 are different, the first gate driving circuit 31 and the second gate driving circuit 32 can output light-emitting control signals with different duty cycles, thereby achieving brightness compensation by compensating the light-emitting duration of the sub-pixels in the first display partition AA1 in a partial refresh frame, thereby improving the display effect.

[0109] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0110] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A brightness compensation method for a display panel, characterized in that: The display panel comprises a first display partition and a second display partition, and in the case of partition multi-frequency display, the refresh frequency of the first display partition is lower than the refresh frequency of the second display partition; comprising: In a full refresh frame, the data voltage of the sub-pixels in the first display partition is compensated according to the total current under the display screen of the first setting frame; the full refresh frame is a writing frame of the first display partition and the second display partition, the first setting frame is before the full refresh frame, or the first setting frame includes the full refresh frame; the total current is equal to the sum of the driving currents corresponding to the sub-pixels in the display panel; In a partial refresh frame, the light emission duration of the sub-pixels in the first display partition is compensated and adjusted to perform brightness compensation on the sub-pixels in the first display partition; the partial refresh frame is a hold frame for the first display partition and a write frame for the second display partition.

2. The brightness compensation method of a display panel according to claim 1, characterized in that: The method of compensating the data voltage of the sub-pixel in the first display partition according to the total current of the display screen of the first setting frame in the full refresh frame includes: Obtaining the total current in the display screen of the first setting frame; Determining a first compensation data voltage according to a total current and an out-of-plane resistance under a display screen of the first setting frame; wherein the display panel includes a power bus connecting a pixel circuit of a sub-pixel in a display area and a power supply in a non-display area, and the out-of-plane resistance is equal to a resistance of the power bus; Compensating, according to the first compensation data voltage, an initial data voltage corresponding to a sub-pixel in the first display partition under a target display image of the full refresh frame; Preferably, the power bus is located in the non-display area; Preferably, the first setting frame includes a display frame adjacent to the full refresh frame and before the full refresh frame.

3. The brightness compensation method of a display panel according to claim 2, characterized in that: The determining of the first compensation data voltage according to the total current and the out-of-plane resistance comprises: determining the product of the total current under the display screen of the first setting frame and the out-of-plane resistance as the first compensation data voltage; Preferably, the initial data voltage corresponding to the sub-pixel in the first display partition under the target display screen of the full refresh frame is compensated according to the first compensation data voltage, including: determining the difference between the initial data voltage and the first compensation data as the target data voltage, and providing the corresponding target data voltage to the sub-pixel in the first display partition within the full refresh frame.

4. The brightness compensation method of a display panel according to claim 2, characterized in that: Obtaining the total current in the display screen of the first setting frame includes: The current on the power bus under the display panel of the first setting frame is obtained as the total current.

5. The brightness compensation method of a display panel according to claim 2, characterized in that: Obtaining the total current in the display screen of the first setting frame includes: Acquire a display grayscale corresponding to each of the sub-pixels in the display panel under the display picture of the first setting frame; The driving current corresponding to the sub-pixel is determined according to the display grayscale corresponding to the sub-pixel, and the total current is determined according to the driving current corresponding to each sub-pixel.

6. The brightness compensation method for a display panel according to any one of claims 1 to 5, characterized in that: The compensating and adjusting the light emission duration of the sub-pixels in the first display partition in the partial refresh frame to perform brightness compensation on the sub-pixels in the first display partition includes: Determine the second compensation data voltage according to the total current corresponding to the display picture of the second setting frame; the second setting frame is before the partial refresh frame, and / or the second setting frame includes the partial refresh frame; Determine the compensated luminous duration according to the corresponding relationship between the difference between the second compensated data voltage and the first compensated data voltage corresponding to the full refresh frame before the partial refresh frame and the luminous duration compensation amount; According to the compensated light emission duration, the initial light emission duration corresponding to the sub-pixel in the first display partition is compensated to perform brightness compensation on the sub-pixel in the first display partition; Preferably, the second setting frame is a display frame adjacent to the partial refresh frame and before the partial refresh frame; Preferably, the compensated luminous duration is determined according to a corresponding relationship between a difference between the second compensated data voltage and a first compensated data voltage corresponding to the full refresh frame before the partial refresh frame and closest to the partial refresh frame and the luminous duration compensation amount; Preferably, within the partial refresh frame, at the same display grayscale, the sub-pixels in the first display partition and the sub-pixels in the second display partition have different corresponding light emission durations.

7. The brightness compensation method of a display panel according to claim 6, characterized in that: The display panel further includes a pixel circuit, the pixel circuit is electrically connected to the sub-pixel correspondingly; the pixel circuit includes a driving module and a light-emitting control module, the driving module and the light-emitting control module are connected in series between a power line and the sub-pixel; the light-emitting duration compensation amount includes a duty cycle compensation amount for a light-emitting control signal of the light-emitting control module; The method of determining the compensated luminous duration according to the corresponding relationship between the difference between the second compensated data voltage and the first compensated data voltage corresponding to the full refresh frame before the partial refresh frame and the luminous duration compensation amount comprises: determining a compensation duty cycle according to a corresponding relationship between a difference between the second compensation data voltage and the first compensation data voltage corresponding to the full refresh frame before the partial refresh frame and a duty cycle compensation amount; The method of compensating the initial light emission duration corresponding to the sub-pixel in the first display partition according to the compensated light emission duration to perform brightness compensation on the sub-pixel in the first display partition includes: The initial duty cycle corresponding to the sub-pixel in the first display partition is compensated according to the compensation duty cycle, so as to perform brightness compensation on the sub-pixel in the first display partition.

8. The brightness compensation method of a display panel according to claim 6, characterized in that: Also includes: In the partial refresh frame, data voltages of sub-pixels in the second display partition are compensated according to the second compensation data voltage.

9. The brightness compensation method of a display panel according to claim 1, characterized in that: Also includes: In the full refresh frame, the data voltage of the sub-pixel in the second display partition is compensated according to the total current under the display picture of the first setting frame; Preferably, in the case of non-partitioned multi-frequency display and the full refresh frame of partitioned multi-frequency display, at the same display grayscale, the compensation data voltages corresponding to the sub-pixels in the first display partition and the second display partition are the same.

10. A display panel, characterized in that: Brightness compensation is performed using the brightness compensation method for a display panel as described in any one of claims 1 to 9.

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