Display device and driving method of display panel

Abstract

The invention discloses a display device and a driving method of a display panel. The display device comprises a display panel and a driving chip, the display panel comprises a light-emitting control driving circuit and a plurality of sub-pixels arranged in an array. The light-emitting control driving circuit comprises a plurality of light-emitting control output ends, and one light-emitting control output end is correspondingly connected with at least one row of sub-pixels through one light-emitting control signal line; wherein the sub-pixels connected with the same light-emitting control signal line are at least partially connected with the same power supply signal line; the driving chip comprises a plurality of power supply signal output ends, and the plurality of power supply signal output ends are connected with the plurality of power supply signal lines in a one-to-one correspondence manner; and the driving chip is used for transmitting various power supply voltages to the second picture through the power supply signal line when the display panel is switched from displaying the first picture to displaying the second picture. According to the embodiment of the invention, the smear problem of the display panel during picture switching can be solved, and the picture display effect is improved.

Description

Technical Field

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

[0002] With the continuous development of display technology, the application scope of display panels is becoming more and more extensive, and people's requirements for display panels are also getting higher and higher. In particular, the display quality of display panels has always been one of the important indicators for consumers and panel manufacturers to measure the quality of display panels.

[0003] However, due to the hysteresis effect of the driving transistor in the pixel circuit and other reasons, the existing display panel has a problem of ghosting when the display panel switches the screen, resulting in poor screen display effect. Summary of the invention

[0004] The present invention provides a display device and a driving method for a display panel, so as to solve the problem of image smearing when the display panel switches images and improve the image display effect.

[0005] In a first aspect, an embodiment of the present invention provides a display device, comprising: a display panel and a driving chip; the display panel comprises: a light emitting control driving circuit and a plurality of sub-pixels arranged in an array;

[0006] The light-emitting control driving circuit comprises a plurality of light-emitting control output terminals, and one of the light-emitting control output terminals is correspondingly connected to at least one row of sub-pixels via a light-emitting control signal line; wherein the sub-pixels connected to the same light-emitting control signal line are at least partially connected to the same power signal line;

[0007] The driving chip comprises a plurality of power signal output terminals, and the plurality of power signal output terminals are connected to the plurality of power signal lines in a one-to-one correspondence;

[0008] The driving chip is used for transmitting a plurality of power supply voltages to the second picture through the power supply signal line when the display panel switches from displaying a first picture to displaying a second picture.

[0009] Optionally, the power supply voltage of some frames in the second picture is different from the power supply voltage of other frames;

[0010] Preferably, the power supply voltage of the first frame in the second picture is different from the power supply voltages of other frames;

[0011] Preferably, the other frames have the same power supply voltage.

[0012] Optionally, all the sub-pixels connected to the same light emitting control signal line are connected to the same power signal line;

[0013] Alternatively, a plurality of sub-pixels of the same color connected to the same light emitting control signal line are connected to the same power signal line;

[0014] Alternatively, each of the sub-pixels is electrically connected to a corresponding power signal line.

[0015] Optionally, the power signal line is connected to the cathode of the light-emitting device in the sub-pixel, and cathodes of the light-emitting devices in the sub-pixels that are not connected to the power signal lines are not electrically connected.

[0016] In a second aspect, an embodiment of the present invention further provides a method for driving a display panel, which is used to drive a display panel in a display device provided by any embodiment of the present invention, and the driving method includes:

[0017] When the display panel switches from displaying a first picture to displaying a second picture, in a part of frames of the second picture, providing a first power supply voltage corresponding to the display area to sub-pixels in at least a part of the display area of ​​the display panel;

[0018] In other frames of the second picture, a second power supply voltage corresponding to at least a portion of the display area of ​​the display panel is provided to sub-pixels of the display area; wherein the first power supply voltage is different from the second power supply voltage.

[0019] Optionally, in a first frame of the second picture, a first power supply voltage corresponding to the display area is provided to sub-pixels in at least a portion of the display area of ​​the display panel.

[0020] Optionally, the first power supply voltage and the second power supply voltage are both used to provide to the cathode of the light-emitting device in each of the sub-pixels in the corresponding display area;

[0021] Each of the sub-pixels includes a non-light-emitting phase and a light-emitting phase in sequence in each display frame;

[0022] In the first frame of the second picture, in the non-light-emitting stage of the sub-pixel, the cathode voltage of the sub-pixel is adjusted to the first power supply voltage corresponding to the display area where the sub-pixel is located, so that in the first frame of the second picture, in the light-emitting stage of the sub-pixel, the cathode voltage of the sub-pixel maintains the first power supply voltage;

[0023] In the second frame of the second picture, in the non-luminous stage of the sub-pixel, the cathode voltage of the sub-pixel is adjusted to the second power supply voltage corresponding to the display area where the sub-pixel is located, so that in the second frame of the second picture, in the luminous stage of the sub-pixel, and in the remaining display frames of the second picture, the cathode voltage of the light-emitting device in the sub-pixel remains at the second power supply voltage.

[0024] Optionally, the first power supply voltage is determined according to a target brightness of each sub-pixel in the display area in the first picture and a target brightness in the second picture, and a reference power supply voltage of each sub-pixel in the display area;

[0025] The second power supply voltage is determined according to a reference power supply voltage of each sub-pixel in the display area.

[0026] Optionally, the step of determining the first power supply voltage corresponding to any display area includes:

[0027] Determine a voltage adjustment parameter corresponding to the display area; wherein the voltage adjustment parameter is determined based on a target brightness of each of the sub-pixels in the display area in the first picture and a target brightness in the second picture;

[0028] Determine a first power supply voltage corresponding to the display area according to the voltage adjustment parameter and a reference power supply voltage of each sub-pixel in the display area;

[0029] Preferably, the voltage adjustment parameter is determined based on a ratio or a difference between a target brightness of each sub-pixel in the display area in the first picture and a target brightness of each sub-pixel in the second picture.

[0030] Optionally, determining a first power supply voltage corresponding to the display area according to the voltage adjustment parameter and a reference power supply voltage of each sub-pixel in the display area includes:

[0031] The product of the voltage adjustment parameter and the reference voltage statistical value is used as the first power supply voltage; wherein the reference voltage statistical value is an average value of the reference power supply voltages of each sub-pixel in the display area, or a reference power supply voltage of any sub-pixel in the display area.

[0032] Optionally, if the target brightness of each of the sub-pixels in the display area in the second picture is greater than the target brightness of the corresponding sub-pixel in the first picture, the voltage adjustment parameter corresponding to the display area is greater than 1;

[0033] If the target brightness of each of the sub-pixels in the display area in the second picture is smaller than the target brightness of the corresponding sub-pixel in the first picture, then the voltage adjustment parameter corresponding to the display area is smaller than 1.

[0034] Optionally, the second power supply voltage corresponding to the display area is a statistical value of a reference voltage corresponding to the display area; wherein the statistical value of the reference voltage is an average value of the reference power supply voltages of each sub-pixel in the display area, or the reference power supply voltage of any sub-pixel in the display area.

[0035] In the display device provided by the embodiment of the present invention, a sub-pixel connected to a light-emitting control signal line is at least partially connected to the same power signal line; and multiple power signal output terminals of the driving chip are connected to the multiple power signal lines in a one-to-one correspondence. When the display panel switches from the first picture to the second picture, the gate-source voltage difference or gate-drain voltage difference of the driving transistor in the sub-pixel can be adjusted by adjusting the power supply voltage of the sub-pixel in some frames of the second picture, so as to adjust the driving current generated by the driving transistor to compensate for the deviation of the driving current of some frames after the picture switching caused by the hysteresis effect of the driving transistor, so that the display brightness of the light-emitting device in some frames after the picture switching approaches the target brightness after the picture switching, and the difference between the display brightness of the sub-pixel in some frames of the second picture and the display brightness in other frames of the second picture is reduced, thereby solving the problem of the display panel when the picture is switched and improving the picture display effect.

[0036] 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

[0037] 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.

[0038] Figure 1 is a structural schematic diagram of a display device provided by an embodiment of the present invention;

[0039] Figure 2 is a structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0040] Figure 3 is a schematic flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0041] Figure 4 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0042] Figure 5 is a driving timing diagram of a display panel provided by an embodiment of the present invention;

[0043] Figure 6 is a schematic structural diagram of another display device provided by an embodiment of the present invention;

[0044] Figure 7is a driving timing diagram of another display panel provided by an embodiment of the present invention;

[0045] Figure 8 is a structural schematic diagram of another display device provided by an embodiment of the present invention;

[0046] Fig. 9 This is a driving timing diagram of another display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] As described in the background technology, the existing display panel has a ghosting problem when switching between pictures. The following is an explanation of the cause of this problem: the existing display panel usually includes a plurality of pixel circuits, and the pixel circuit includes a driving transistor that drives the light-emitting device to emit light. The driving transistor controls the light brightness of the light-emitting device by controlling the driving current flowing through the light-emitting device. The magnitude of the driving current generated by the driving transistor is related to the gate-source voltage difference of the driving transistor. Under different display grayscales, the gate-source voltage difference of the driving transistor is different. Under different gate-source voltage differences, the working state of the driving transistor is different. When the display panel displays two different pictures, due to the hysteresis effect of the driving transistor, the brightness of the picture will slowly change during the picture switching process, that is, the brightness of the latter picture in the initial time period cannot reach the target brightness, resulting in a brightness deviation in at least one frame of the latter picture, which is easily visible and causes ghosting. Taking the display panel switching from a black screen to a white screen as an example, for example, when the N-1 frame is a black screen, the N frame is a white screen, and the N+1 frame is a white screen, each driving transistor needs to output a driving current for displaying a white screen in both the N frame and the N+1 frame. However, from the N-1 frame to the N frame, each driving transistor is converted from an off state to an on state, and from the N frame to the N+1 frame, each driving transistor is converted from an on state to an on state. Due to the hysteresis effect of the driving transistor, the current-voltage curve of the driving transistor is different in the N frame and the N+1 frame. Under the same gate-source voltage, the driving transistor in the N frame cannot output the same driving current as that in the N+1 frame, but the driving current in the N frame is smaller, which makes the brightness of the N frame low, resulting in an obvious ghosting problem.

[0050] In order to solve the above-mentioned problem of ghosting, an embodiment of the present invention provides a display device. Figure 1 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention. Figure 1 The display device includes: a display panel and a driving chip 50. The display panel includes: a light-emitting control driving circuit 100 and a plurality of sub-pixels 20; the light-emitting control driving circuit 100 is, for example, disposed in a non-display area NAA of the display panel, and each sub-pixel 20 is, for example, arranged in an array in a display area AA of the display panel.

[0051] The light emitting control driving circuit 100 includes a multi-stage shift register 10 in cascade connection, and the output end of each shift register 10 serves as a light emitting control output end of the light emitting control driving circuit 100. One light emitting control output end is connected to at least one row of sub-pixels 20 via a light emitting control signal line LEM, and the light emitting control driving circuit 100 is used to provide a light emitting control signal EM to each sub-pixel 20 via the light emitting control signal line LEM. For example, Figure 1As shown, a light-emitting control signal line LEM is connected to a row of sub-pixels 20. Among them, at least some of the sub-pixels connected to a light-emitting control signal line LEM are connected to the same power signal line. The driver chip 50 includes a plurality of power signal output terminals; the plurality of power signal output terminals are connected to the plurality of power signal lines in a one-to-one correspondence. The driver chip 50 is used to transmit a variety of power supply voltages to the second picture through the power signal line when the display panel switches from displaying the first picture to displaying the second picture. In addition, the driver chip 50 can also provide an input signal to the first-stage shift register 10 through the trigger signal line LIN, and provide a data voltage to each sub-pixel 20 through a data line (not shown in the figure). The sub-pixel 20 may include a pixel circuit and a light-emitting device.

[0052] For the sake of convenience in explanation, the sub-pixels 20 connected to the same power signal line are recorded as a display area A. The sub-pixels 20 in the same display area A receive the same power voltage. By providing different power voltages to the sub-pixels 20 in different display areas A of the display panel, each display area A can be driven independently, thereby achieving a better display effect. Figure 1 As shown, each sub-pixel 20 may constitute a display area A. For the convenience of distinction and explanation, the display area where the i-th row and j-th column sub-pixel 20 is located is marked as Aij. Correspondingly, the power signal line connected to the i-th row and j-th column display area Aij is marked as LVij.

[0053] In order to explain the specific adjustment method of the power supply voltage of each display area A in the second picture, the specific structure of the pixel circuit is firstly exemplified below.

[0054] Figure 2 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention. Figure 2In one embodiment, optionally, the pixel circuit includes: a driving transistor DTFT, a data writing transistor M24, a threshold compensation transistor M25, a gate reset transistor M22, an anode reset transistor M23, a first light emission control transistor M26, a second light emission control transistor M27, and a storage capacitor Cst, forming a pixel circuit of a 7T1C architecture. Specifically, the first light emission control transistor M26, the driving transistor DTFT, the second light emission control transistor M27 and the light emitting device OLED are connected in series in sequence; the data writing transistor M24 is connected to the data voltage Vdata and is electrically connected to the source of the driving transistor DTFT; the threshold compensation transistor M25 is connected between the gate and the drain of the driving transistor DTFT; the gate reset transistor M22 is connected to the first initialization signal Vref1 and is electrically connected to the gate of the driving transistor DTFT; the anode reset transistor M23 is connected to the second initialization signal Vref2 and is electrically connected to the anode of the light emitting device OLED; the cathode of the light emitting device OLED is connected to the cathode voltage VSS; one end of the storage capacitor Cst is connected to the gate of the driving transistor DTFT, and the other end is connected to the first power supply signal VDD. Among them, the gate of the gate reset transistor M22 is connected to the first scanning signal S1, the gate of the threshold compensation transistor M25, the gate of the data writing transistor M24 and the gate of the anode reset transistor M23 can all be connected to the second scanning signal S2, and the gates of the first light-emitting control transistor M26 and the second light-emitting control transistor M27 are both connected to the light-emitting control signal EM.

[0055] Then, the power supply voltage may specifically be a first power supply signal VDD or a cathode voltage VSS. Under the condition that the data voltage Vdata is constant, the drive current generated by the driving transistor DTFT can be adjusted by adjusting the first power supply signal VDD or the cathode voltage VSS. Among them, adjusting the first power supply signal VDD is equivalent to adjusting the gate-source voltage difference of the driving transistor DTFT. Taking the driving transistor DTFT as a P-type transistor as an example, the larger the first power supply signal VDD is, the larger the gate-source voltage difference of the driving transistor DTFT is, and the larger the drive current generated by the driving transistor DTFT is. Since the drain of the driving transistor DTFT in the pixel circuit is connected to the cathode voltage VSS through the light-emitting device OLED, adjusting the cathode voltage VSS is equivalent to adjusting the gate-drain voltage difference of the driving transistor DTFT. In the actual application process, the inventor has experimentally verified that by adjusting the gate-drain voltage difference of the driving transistor, the drive current generated by the driving transistor can also be adjusted. Still taking the driving transistor DTFT as a P-type transistor as an example, the lower the cathode voltage VSS is, the larger the gate-drain voltage difference of the driving transistor DTFT is, and the larger the drive current generated by the driving transistor DTFT is.

[0056] Each display screen can maintain a display duration of at least two frames. When the display panel switches from the first screen to the second screen, the brightness of the second screen will change slowly, and the brightness of the display frame of the second screen in the initial time period cannot reach the target brightness, thereby forming a smear. The display device provided in the embodiment of the present invention can support the driver chip to provide a variety of power supply voltages to the second screen, which can effectively solve the above-mentioned smear problem. Specifically, the gate-source voltage difference or gate-drain voltage difference of the driving transistor DTFT can be adjusted by adjusting the power supply voltage of the sub-pixel 20 in some frames of the second screen (i.e., the display frame in the initial time period), thereby adjusting the driving current generated by the driving transistor DTFT to compensate for the deviation of the driving current in the initial time period after the screen switching caused by the hysteresis effect of the driving transistor DTFT, so that the display brightness of the light-emitting device OLED in the initial time period after the screen switching approaches the target brightness after the screen switching, and reduces the difference between the display brightness of the light-emitting device OLED in the initial time period of the second screen and the display brightness in other subsequent frames in the second screen.

[0057] It should be noted that in the second picture, the hysteresis effect of the driving transistor DTFT acts on the initial part of the frame, and after the conversion process of the above part of the frame, the working state of the driving transistor DTFT in the subsequent other frames is basically the same. Therefore, the same power supply voltage can be provided to the sub-pixel 20 in the subsequent other frames.

[0058] Exemplarily, the initial partial frame may be the first frame of the second picture. Then, during the driving process of the second picture, the driving chip 50 may control the power supply voltage of the first frame in the second picture to be different from the power supply voltages of other frames.

[0059] Alternatively, the initial partial frames may be multiple display frames starting from the first frame in the second picture. Then, the driver chip 50 may control the power supply voltage of the partial frames in the second picture to be the same and different from the power supply voltage of other frames to simplify the control logic. Alternatively, since the working state of the driving transistor DTFT is constantly changing in the above partial frames, the driver chip 50 may also control the power supply voltage of the partial frames in the second picture to change continuously with the working state of the driving transistor DTFT to achieve a better display adjustment effect.

[0060] On the basis of the above embodiments, optionally, when the power supply voltage is the cathode voltage VSS of the light-emitting device OLED in the sub-pixel 20, by isolating the cathode layer of the light-emitting device OLED in the display panel and designing it into a plurality of independent regions, the cathode of the sub-pixel 20 in each region can be provided with the cathode voltage VSS separately. For example, if the cathode voltage VSS of the light-emitting device OLED in each sub-pixel needs to be provided separately, in the process of preparing the display panel, before preparing the light-emitting layer of each sub-pixel 20, an isolation column can be arranged around the periphery of the light-emitting region of the light-emitting device OLED in each sub-pixel 20, and the isolation column is used to limit the deposition position of the light-emitting layer material of the light-emitting device OLED in each sub-pixel 20. In addition, in the process of depositing the cathode layer material, the cathode of the light-emitting device OLED in each sub-pixel 20 is isolated by the isolation column, and there is no electrical connection between the cathode of the light-emitting device OLED of any sub-pixel 20 and the cathodes of the sub-pixels 20 adjacent to it, front, back, left, and right, so that each sub-pixel 20 can be provided with the cathode voltage VSS separately, and the cathode voltages VSS of each sub-pixel 20 do not affect each other.

[0061] Figure 3 FIG. 1 is a flow chart of a method for driving a display panel provided by an embodiment of the present invention. Figure 3 , the driving method of the display panel may specifically include the following steps:

[0062] S110. When the display panel switches from displaying a first picture to displaying a second picture, in a portion of frames of the second picture, a first power supply voltage corresponding to a display area is provided to sub-pixels in at least a portion of a display area of ​​the display panel.

[0063] Among them, the first power supply voltage is determined according to the target brightness of each sub-pixel 20 in the display area A in the first picture and the target brightness in the second picture, and the reference power supply voltage of each sub-pixel 20 in the display area A. Exemplarily, the reference power supply voltage may be a power supply voltage value determined during the gamma debugging process, and the reference power supply voltage values ​​of the same sub-pixel 20 at different grayscales may be the same or different, which is not limited here. When the reference power supply voltage values ​​of the same sub-pixel 20 at different grayscales are different, the reference power supply voltage mentioned here may be understood as the reference power supply voltage corresponding to the target grayscale of the sub-pixel 20 in the second picture. And, the reference power supply voltage values ​​of different sub-pixels 20 in different display areas A at the same grayscale may be the same or different, which is also not limited here. Exemplarily, the partial frame may be the first frame or the first few frames in the second picture, which may be specifically determined according to the working characteristics of the sub-pixel 20 and the adjustment requirements of the display picture.

[0064] S120. In other frames of the second picture, provide a second power supply voltage corresponding to the display area to sub-pixels in at least a portion of the display area of ​​the display panel; wherein the first power supply voltage is different from the second power supply voltage.

[0065] The second power supply voltage is determined according to the reference power supply voltage of each sub-pixel 20 in the display area A. Specifically, the reference power supply voltage of any sub-pixel 20 in the display area A can be used as the second power supply voltage corresponding to the display area A, or the average value of the reference power supply voltages of each sub-pixel 20 in the display area A can be used as the second power supply voltage corresponding to the display area. That is to say, the second power supply voltage is actually the embodiment of the reference power supply voltage of each sub-pixel 20 in the display area A.

[0066] Taking the first frame in the second picture as an example, in the second picture, in the frames other than the first frame, the second power supply voltage directly reflects the reference power supply voltage of each sub-pixel 20 in the display area, so that each sub-pixel 20 can display normally based on the power supply voltage value obtained by gamma debugging. In the first frame of the second picture, the first power supply voltage is determined based on the target brightness difference between each sub-pixel 20 in the display area A in the first picture and the second picture, and the reference power supply voltage of each sub-pixel 20. Based on this, the brightness difference between the first frame and other frames of each sub-pixel 20 in the second picture can be reduced, thereby solving the problem of ghosting.

[0067] In the following, the structure of the display panel and the driving method thereof are specifically described by taking the power supply voltage as the cathode voltage VSS of the sub-pixel 20 as an example and a part of the frames in the second picture as the first frame thereof as an example.

[0068] by Figure 1 Taking the panel structure in as an example, the first power supply voltage is determined as follows:

[0069] In the second frame and subsequent frames of the second picture, the second power supply voltage of each sub-pixel 20 can directly adopt the reference power supply voltage of the sub-pixel 20 in the second picture.

[0070] For the first frame of the second picture, for any sub-pixel 20, if its target brightness in the first picture is lower than its target brightness in the second picture, the sub-pixel 20 may have a problem of brightness lower than the target brightness in the first frame of the second picture, so the first power supply voltage corresponding to the sub-pixel 20 can be set to be lower than its reference power supply voltage in the second picture, so as to increase the gate-drain voltage difference of the driving transistor DTFT in the sub-pixel 20 in the first frame of the second picture, thereby increasing the driving current generated by the driving transistor DTFT and improving the display brightness of the sub-pixel 20 in the first frame of the second picture. For any sub-pixel 20, if its target brightness in the first picture is higher than its target brightness in the second picture, the sub-pixel 20 may have a problem of brightness higher than the target brightness in the first frame of the second picture, so the first power supply voltage corresponding to the sub-pixel 20 can be set to be higher than its reference power supply voltage in the second picture, so as to reduce the gate-drain voltage difference of the driving transistor DTFT in the sub-pixel 20 in the first frame of the second picture, thereby reducing the driving current generated by the driving transistor DTFT and reducing the display brightness of the sub-pixel 20 in the first frame of the second picture. For any sub-pixel 20, if its target brightness in the first picture is equal to its target brightness in the second picture, the first power supply voltage corresponding to the sub-pixel 20 can be set equal to its reference power supply voltage in the second picture. The difference between the first power supply voltage and the reference power supply voltage can be specifically determined according to the difference between the target brightness of the sub-pixel 20 in the first picture and the second picture. For example, the greater the difference between the target brightness of the sub-pixel 20 in the first picture and the second picture, the greater the difference between the first power supply voltage and the reference power supply voltage can be set.

[0071] Exemplarily, the correspondence between the brightness difference of each sub-pixel 20 and the power supply voltage adjustment amount can be pre-stored in the memory of the driver chip 50 in the form of a graph, a table, a curve or a function; and, the brightness difference that may exist between some frames of the second picture of each sub-pixel 20 and other frames under different brightness switching conditions can also be pre-stored in the memory of the driver chip 50, so that during the picture switching process, the driver chip 50 can quickly determine the first power supply voltage value corresponding to each sub-pixel 20 by looking up the corresponding relationship.

[0072] The driving method of the display panel provided by the embodiment of the present invention provides different first power supply voltages and second power supply voltages in partial frames and other frames of the second picture for at least a portion of the display area A during the process of switching the display panel from displaying the first picture to displaying the second picture. In this way, the difference between the driving current generated by the driving transistor DTFT in the partial frames of the second picture and other frames caused by the hysteresis effect of the driving transistor DTFT in the sub-pixel 20 during the picture switching process can be compensated, so that the display brightness of each sub-pixel 20 in the partial frames of the second picture approaches the target brightness in the second picture, and the difference between the display brightness of each sub-pixel 20 in the partial frames of the second picture and other frames is reduced, thereby solving the problem of ghosting when the display panel switches pictures and improving the picture display effect. Among them, by adjusting the power supply voltage of the sub-pixels 20 in at least a portion of the display area A in the display panel, the ghosting problem of at least a portion of the display area A can be solved; preferably, the power supply voltage of the sub-pixels 20 in all the display areas A of the display panel is adjusted to solve the ghosting problem of the entire display panel.

[0073] The specific timing for adjusting the power supply voltage is exemplified below in conjunction with a specific driving process of the pixel circuit.

[0074] Figure 4 1 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention. Figure 2 and Figure 4 , exemplarily, each transistor in the pixel circuit is a P-type transistor; the driving process of the pixel circuit includes: a non-luminous stage T1 and a luminous stage T2, and the non-luminous stage T1 may specifically include a reset stage T11 and a data writing stage T12.

[0075] In the reset phase T11, the first scan signal S1 is at a low potential, the second scan signal S2 and the light emitting control signal EM are at a high potential, the gate reset transistor M22 is turned on, and the first initialization signal Vref1 resets the gate of the driving transistor DTFT through the gate reset transistor M22.

[0076] In the data writing stage T12, the second scanning signal S2 is at a low potential, and the first scanning signal S1 and the light emitting control signal EM are both at a high potential. The anode reset transistor M23, the data writing transistor M24 and the threshold compensation transistor M25 are all turned on. The data voltage Vdata is transmitted to the gate of the driving transistor DTFT through the data writing transistor M24, the source and drain of the driving transistor DTFT, and the threshold compensation transistor M25. At the same time, the second initialization signal Vref2 resets the anode of the light emitting device OLED through the anode reset transistor M23.

[0077] In the light emitting stage T2, the first scanning signal S1 and the second scanning signal S2 are both high, the light emitting control signal EM is low, the first light emitting control transistor M26 and the second light emitting control transistor M27 are both turned on, and the driving transistor DTFT generates a driving current to drive the light emitting device OLED to emit light.

[0078] In summary, the potential jump time of the luminous control signal EM connected to the sub-pixel 20 determines the boundary time between the non-luminous stage T1 and the luminous stage T2 of the sub-pixel in the display frame, and the conduction pulses of the first scanning signal S1 and the second scanning signal S2 both act in the non-luminous stage T1.

[0079] For example, Figure 1 In the wiring mode in which each level of shift register 10 is connected to each row of sub-pixels 20, each row of sub-pixels in the display panel can be scanned row by row from top to bottom in each display frame. Therefore, the power supply voltage adjustment process of each sub-pixel in the display panel can also be performed row by row.

[0080] Specifically, for each sub-pixel 20 in each sub-pixel row, in a display frame where the power supply voltage is required, when the row-by-row scanning reaches the sub-pixel row, the power supply voltage can be adjusted at any time in the non-luminous stage T1 of the sub-pixel 20. Since the sub-pixel 20 does not emit light in the non-luminous stage T1, adjusting the power supply voltage at this time can avoid visual flickering caused by adjusting the power supply voltage during the light-emitting process, which is conducive to ensuring the display effect. After the power supply voltage is adjusted in the non-luminous stage T1, the power supply voltage can be maintained until the end of the light-emitting stage T2 of the sub-pixel 20 in the display frame to ensure that the sub-pixel 20 emits light stably.

[0081] Then, for any sub-pixel 20, the specific process of adjusting the power supply voltage in the second picture may include:

[0082] In the first frame of the second picture, in the non-luminous stage T1 of the sub-pixel 20, the cathode voltage VSS of the light-emitting device OLED in the sub-pixel 20 is adjusted to the first power supply voltage corresponding to the display area A where the sub-pixel 20 is located, so that in the first frame of the second picture, in the luminous stage T2 of the sub-pixel 20, the cathode voltage VSS of the light-emitting device OLED in the sub-pixel 20 maintains the first power supply voltage.

[0083] In the second frame of the second picture, in the non-luminous stage T1 of the sub-pixel 20, the cathode voltage VSS of the light-emitting device OLED in the sub-pixel 20 is adjusted to the second power supply voltage corresponding to the display area A where the sub-pixel 20 is located, so that in the second frame of the second picture, in the luminous stage T2 of the sub-pixel, and in the remaining complete display frames of the second picture (i.e., the third frame and subsequent display frames), the cathode voltage VSS of the light-emitting device OLED in the sub-pixel 20 maintains the second power supply voltage.

[0084] against Figure 1 The driving timing of the entire display panel shown can be seen in Figure 5 . Combined Figure 1 and Figure 5 , exemplarily, the light emitting control driving circuit 100 can adopt a connection mode in which a first-level shift register 10 drives a row of pixel circuits to realize row-by-row control of each sub-pixel 20. For the convenience of distinction and explanation, the i-th level light emitting control signal is marked as Emi, the power supply voltage connected to the i-th row and j-th column display area Aij is marked as VSSij, the first power supply voltage connected to the i-th row and j-th column display area Aij is marked as V1_ij, and the second power supply voltage connected to the i-th row and j-th column display area Aij is marked as V2_ij.

[0085] Combination Figure 1 and Figure 5 , illustratively, taking the power supply voltage adjustment process of each sub-pixel 20 in the first column as an example, the driving process of the display panel includes:

[0086] In the first frame F1 of the second picture, when the first-level light-emitting control signal EM1 maintains a high potential, that is, in the non-light-emitting phase T1 of the first row of sub-pixels 20, each power supply voltage connected to each sub-pixel 20 in the first row is adjusted to a corresponding first power supply voltage, for example, the power supply voltage VSS11 connected to the first row and first column of sub-pixels 20 is adjusted to a corresponding first power supply voltage V1_11. In the stage when the second-level light-emitting control signal EM2 maintains a high potential, that is, in the non-light-emitting phase T1 of the second row of sub-pixels 20, each power supply voltage connected to each sub-pixel 20 in the second row is adjusted to a corresponding first power supply voltage, for example, the power supply voltage VSS21 connected to the second row and first column of sub-pixels 20 is adjusted to a corresponding first power supply voltage V1_21. And so on, until the scanning of each row of sub-pixels 20 in this frame is completed. Exemplarily, the power supply voltage connected to the sub-pixel 20 can jump to the first power supply voltage at the same time as the light-emitting control signal EM jumps to a high potential, that is, at the start of the non-light-emitting phase T1.

[0087] In the second frame F2 of the second picture, in the stage where the first-level light-emitting control signal EM1 maintains a high potential, that is, in the non-light-emitting stage T1 of the first row of sub-pixels 20, each power supply voltage connected to each sub-pixel 20 in the first row is adjusted to the corresponding second power supply voltage, for example, the power supply voltage VSS11 connected to the first row and first column of sub-pixels 20 is adjusted to the corresponding second power supply voltage V2_11. In the stage where the second-level light-emitting control signal EM2 maintains a high potential, that is, in the non-light-emitting stage T1 of the second row of sub-pixels 20, each power supply voltage connected to each sub-pixel 20 in the second row is adjusted to the corresponding second power supply voltage, for example, the power supply voltage VSS21 connected to the second row and first column of sub-pixels 20 is adjusted to the corresponding second power supply voltage V2_21. And so on, until the scanning of each row of sub-pixels 20 in this frame is completed.

[0088] In the remaining frames of the second picture, the power supply voltage connected to each sub-pixel 20 keeps the corresponding second power supply voltage unchanged.

[0089] In the above-mentioned embodiments, each sub-pixel 20 is exemplarily provided to be electrically connected to each power signal line one by one, that is, each sub-pixel 20 constitutes a division method of a display area A, so that the power supply voltage of each sub-pixel 20 can be adjusted individually according to its target brightness difference in the first picture and the second picture to achieve the best possible display effect. However, this division method is not intended to be a limitation of the present invention. In other embodiments, a power signal line connects multiple sub-pixels 20, that is, multiple sub-pixels 20 are set to form a display area A to simplify the drive control logic of the display panel. It should be noted that the cathodes of the light-emitting devices OLED in the sub-pixels 20 connected to different power signal lines are not electrically connected, that is, the cathodes of the light-emitting devices OLED of different sub-pixels 20 in different display areas A are electrically isolated.

[0090] Figure 6 is a schematic diagram of the structure of another display device provided by an embodiment of the present invention. Figure 6 In another embodiment, optionally, all sub-pixels 20 connected to a light-emitting control signal line may be connected to the same power signal line, that is, multiple sub-pixels 20 connected to the same light-emitting control signal EM constitute a display area A. Therefore, each sub-pixel 20 can realize independent control of the power supply voltage by row partition according to the connection mode between each level of shift register 10 and sub-pixel 20 in the light-emitting control driving circuit 100. Figure 6As shown, the light emitting control driving circuit 100 adopts a one-drive-two driving mode, and each stage of the shift register 10 is connected to two rows of sub-pixels 20, and correspondingly, every two rows of sub-pixels 20 can be set to form a display area A. For the convenience of distinction and explanation, the display area where the 2k-1th row and the 2kth row of sub-pixels 20 are located is marked as Ak. It should be noted that when the light emitting control driving circuit 100 adopts a one-drive-n driving mode, n is an integer greater than 2, and correspondingly, every n rows of sub-pixels 20 can be set to form a display area A.

[0091] Furthermore, multiple sub-pixels 20 in the same display area A can be set with a common cathode, so that only one power signal line can be arranged in each display area A, so as to simplify the wiring of the display panel and reduce the output ports of the driver chip 50, which is conducive to reducing the cost of the driver chip. This display area division method is particularly suitable for alleviating the smear phenomenon during the switching process when the target brightness of each sub-pixel 20 in the same display area A has a consistent change trend when switching between the first screen and the second screen, so that the adjustment of the power supply voltage in the same display area A can take into account the power supply voltage adjustment requirements of each sub-pixel 20 in the display area A. For the convenience of distinction and explanation, the power signal line connected to the display area Ak is marked as LVk.

[0092] against Figure 6 The display panel shown in FIG. 1 has a driving timing sequence as shown in FIG. Figure 7 . Combined Figure 6 and Figure 7 For ease of distinction and explanation, the i-th level light emitting control signal is marked as Emi, the power supply voltage connected to the display area Ak is marked as VSSk, the first power supply voltage connected to the display area Ak is marked as V1_k, and the second power supply voltage connected to the display area Ak is marked as V2_k.

[0093] Combination Figure 6 and Figure 7 , exemplarily, in each display frame that needs to adjust the power supply voltage, such as the first frame F1 and the second frame F2 in the second picture, the driver chip 50 also adjusts the power supply voltage of each display area A according to the potential jump process of each level of light-emitting control signal. Specifically, at any time in the high potential holding stage of any level of light-emitting control signal, the power supply voltage of the display area A connected to the light-emitting control signal is controlled to jump to the power supply voltage required in the display frame.

[0094] Figure 8 is a schematic diagram of the structure of another display device provided by an embodiment of the present invention. Figure 8In another embodiment, the display panel optionally includes at least two sub-pixels 20 of different colors, for example, a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. Then, a plurality of sub-pixels 20 of the same color connected to a light-emitting control signal line may be connected to the same power signal line, that is, a plurality of sub-pixels 20 of the same color connected to the same light-emitting control signal constitute a display area A. Still taking the light-emitting control driving circuit 100 adopting a one-drive-two driving mode as an example, each stage of the shift register 10 is connected to two rows of sub-pixels 20, and correspondingly, the sub-pixels 20 of the same color in every two rows may be arranged to constitute a display area A. For the sake of distinction and explanation, the display area where the sub-pixels 20 of color X (X is R, G, or B) in the 2k-1th row and the 2kth row are located is marked as AkX.

[0095] Furthermore, multiple sub-pixels 20 in the same display area A can be set with a common cathode to simplify the wiring of the display panel and reduce the output ports of the driving chip 50. This display area division method, on the basis of dividing the display area according to the driving architecture of the light-emitting control driving circuit 100, also controls the power supply voltages of sub-pixels 20 of different colors separately and independently. On the basis of alleviating the smear problem, it can also alleviate the color cast problem caused by the brightness ratio of sub-pixels 20 of different colors deviating from the target due to the inconsistent threshold voltage offset of sub-pixels 20 of different colors caused by the hysteresis of the driving transistor, thereby further improving the display effect. For the sake of distinction and explanation, the power signal line connected to the display area AkX is marked as LVkX.

[0096] against Figure 8 The display panel shown in FIG. 1 has a driving timing sequence as shown in FIG. Fig. 9 . Combined Figure 8 and Fig. 9 For ease of distinction and explanation, the i-th level light emitting control signal is marked as Emi, the power supply voltage connected to the display area AkX is marked as VSSkX, the first power supply voltage connected to the display area AkX is marked as V1_k_X, and the second power supply voltage connected to the display area AkX is marked as V2_k_X.

[0097] Combination Figure 8 and Fig. 9 , for example, in each display frame that needs to adjust the power supply voltage, such as the first frame F1 and the second frame F2 in the second picture, the driver chip 50 can independently adjust the power supply voltage of each color display area A in the same row according to the potential jump process of each level of light-emitting control signal. Specifically: at any time in the high potential holding stage of any level of light-emitting control signal, the power supply voltage of the display area A of different colors connected to the light-emitting control signal is controlled to jump to the corresponding power supply voltage in the display frame.

[0098] The embodiment of the present invention further provides a display panel driving method, which is used to drive the display panel in the display device provided by any embodiment of the present invention, and has corresponding beneficial effects. The driving method can be executed by a driving chip. Specifically, see Figure 3 , the driving method includes:

[0099] S110. When the display panel switches from displaying a first picture to displaying a second picture, in a portion of frames of the second picture, a first power supply voltage corresponding to a display area is provided to sub-pixels in at least a portion of a display area of ​​the display panel.

[0100] S120. In other frames of the second picture, provide a second power supply voltage corresponding to the display area to sub-pixels in at least a portion of the display area of ​​the display panel; wherein the first power supply voltage is different from the second power supply voltage.

[0101] It should be noted that in each embodiment of the display device, a variety of driving methods for display panels with different structures are specifically described, and these methods can all be considered as the driving methods of the display panel provided in the embodiments of the present invention, and the repeated contents will not be repeated here.

[0102] The following is an exemplary description of a specific method for determining the first power supply voltage and the second power supply voltage.

[0103] Based on the above embodiments, optionally, the step of obtaining the first power supply voltage corresponding to any display area A may include:

[0104] Step 1, determine the voltage adjustment parameter (denoted as K) corresponding to the display area A; wherein the voltage adjustment parameter K is determined based on the target brightness of each sub-pixel 20 in the display area A in the first picture and the target brightness in the second picture.

[0105] Among them, the basis for determining the voltage adjustment parameter K can specifically be the ratio or difference of the target brightness of each sub-pixel 20 in the display area A in the first picture and the target brightness in the second picture, or other characterization methods that can reflect the difference between the target brightness of the sub-pixel 20 in the first picture and the target brightness in the second picture.

[0106] Step 2: Determine the first power supply voltage corresponding to the display area A according to the voltage adjustment parameter K and the reference power supply voltage of each sub-pixel 20 in the display area A.

[0107] The voltage adjustment parameter K may be a proportional multiple, and the product of the voltage adjustment parameter K and the reference voltage statistical value may be used as the first power supply voltage. The reference voltage statistical value is the second power supply voltage corresponding to the display area A, or the second power supply voltage may be determined in the same manner as the first power supply voltage, except that the voltage adjustment parameter K corresponding to the second power supply voltage is always equal to 1.

[0108] Specifically, when the display area A includes only one sub-pixel 20, the reference voltage statistic is the reference power supply voltage of the sub-pixel. When the display area A includes multiple sub-pixels 20, the reference voltage statistic may be an average value of the reference power supply voltages of the sub-pixels 20 in the display area A, or a reference power supply voltage of any sub-pixel 20 in the display area.

[0109] For the voltage adjustment parameter K, when the display area A includes only one sub-pixel 20, if the target brightness of the sub-pixel 20 in the second picture is greater than the target brightness in the first picture, the voltage adjustment parameter K is greater than 1; since the cathode voltage of the light-emitting device OLED is usually a negative value, by setting the voltage adjustment parameter K greater than 1, it is equivalent to making the calculated first power supply voltage lower than the second power supply voltage, which is conducive to improving the brightness of the sub-pixel 20 in the first frame of the second picture. Conversely, if the target brightness of the sub-pixel 20 in the second picture is less than the target brightness in the first picture, the voltage adjustment parameter K is less than 1, and can even be a negative value.

[0110] When the display area A includes a plurality of sub-pixels 20, if the target brightness change trends of the sub-pixels 20 in the display area A are consistent when the screens are switched, the voltage adjustment parameter K can be determined according to a similar logic when the display area A includes one sub-pixel 20. That is, if the target brightness of the sub-pixels 20 in the display area A in the second screen is greater than the target brightness of the corresponding sub-pixels 20 in the first screen, the voltage adjustment parameter K corresponding to the display area A can be set to be greater than 1, for example, the voltage adjustment parameter K is determined according to the median value or average value of the target brightness change of each sub-pixel 20, so that the first power supply voltage determined based on the voltage adjustment parameter K has a good adjustment effect on the brightness of each sub-pixel 20 in the display area A in the first frame of the second screen. Correspondingly, if the target brightness of the sub-pixels 20 in the display area A in the second screen is less than the target brightness of the corresponding sub-pixel 20 in the first screen, the voltage adjustment parameter K corresponding to the display area A can be set to be less than 1.

[0111] When the display area A includes a plurality of sub-pixels 20, if the target brightness variation trend of some sub-pixels 20 in the display area A when the screen is switched is inconsistent with that of other sub-pixels 20, it is not necessary to adjust the power supply voltage in the display area A. Alternatively, the voltage adjustment parameter K may be determined according to the target brightness variation trend of most sub-pixels 20 in the display area A when the screen is switched.

[0112] On the basis of the above embodiments, optionally, each sub-pixel 20 may share the same voltage adjustment parameter determination logic, for example, the voltage adjustment parameter K corresponding to each display area A is calculated according to the unified correspondence between the target brightness difference and the voltage adjustment parameter K. Alternatively, for sub-pixels 20 of different colors, different correspondences between the target brightness difference and the voltage adjustment parameter K may be recorded, so as to adjust the cathode voltage of each sub-pixel 20 by color, so as to improve the smear color cast problem as much as possible.

[0113] It should be noted that the upper limit and lower limit of the power supply voltage can also be set in the driver chip 50. When the calculated first power supply voltage is greater than the upper limit of the power supply voltage, the upper limit of the power supply voltage is used as the first power supply voltage finally output; and when the calculated first power supply voltage is lower than the lower limit of the power supply voltage, the lower limit of the power supply voltage is used as the first power supply voltage finally output. This setting can ensure the reliability and safety of the display panel driving process.

[0114] 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.

[0115] 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 display device, characterized in that: include: Display panel and driver chip; The display panel comprises: a light emitting control driving circuit and a plurality of sub-pixels arranged in an array; The light-emitting control driving circuit comprises a plurality of light-emitting control output terminals, and one of the light-emitting control output terminals is correspondingly connected to at least one row of sub-pixels via a light-emitting control signal line; wherein the sub-pixels connected to the same light-emitting control signal line are at least partially connected to the same power signal line; The driving chip comprises a plurality of power signal output terminals, and the plurality of power signal output terminals are connected to the plurality of power signal lines in a one-to-one correspondence; The driving chip is used for transmitting a plurality of power supply voltages to the second picture through the power supply signal line when the display panel switches from displaying a first picture to displaying a second picture.

2. The display device according to claim 1, characterized in that The power supply voltage of some frames in the second picture is different from the power supply voltage of other frames; Preferably, the power supply voltage of the first frame in the second picture is different from the power supply voltages of other frames; Preferably, the other frames have the same power supply voltage.

3. The display device according to claim 1, characterized in that All the sub-pixels connected to the same light-emitting control signal line are connected to the same power signal line; Alternatively, a plurality of sub-pixels of the same color connected to the same light emitting control signal line are connected to the same power signal line; Alternatively, each of the sub-pixels is electrically connected to a corresponding power signal line.

4. The display device according to claim 1 or 3, characterized in that: The power signal line is connected to the cathode of the light emitting device in the sub-pixel, and the cathodes of the light emitting devices in the sub-pixels that are not connected to the power signal line are not electrically connected.

5. A method for driving a display panel, characterized in that: For driving a display panel in a display device according to any one of claims 1 to 4, the driving method comprising: When the display panel switches from displaying a first picture to displaying a second picture, in a part of frames of the second picture, providing a first power supply voltage corresponding to the display area to sub-pixels in at least a part of the display area of ​​the display panel; In other frames of the second picture, a second power supply voltage corresponding to at least a portion of the display area of ​​the display panel is provided to sub-pixels of the display area; wherein the first power supply voltage is different from the second power supply voltage.

6. The method for driving a display panel according to claim 5, characterized in that: In a first frame of the second picture, a first power supply voltage corresponding to at least a portion of a display area of ​​the display panel is provided to sub-pixels of the display area.

7. The method for driving a display panel according to claim 6, wherein: The first power supply voltage and the second power supply voltage are both used to provide to the cathode of the light emitting device in each of the sub-pixels in the corresponding display area; Each of the sub-pixels includes a non-light-emitting phase and a light-emitting phase in sequence in each display frame; In the first frame of the second picture, in the non-light-emitting stage of the sub-pixel, the cathode voltage of the sub-pixel is adjusted to the first power supply voltage corresponding to the display area where the sub-pixel is located, so that in the first frame of the second picture, in the light-emitting stage of the sub-pixel, the cathode voltage of the sub-pixel maintains the first power supply voltage; In the second frame of the second picture, in the non-luminous stage of the sub-pixel, the cathode voltage of the sub-pixel is adjusted to the second power supply voltage corresponding to the display area where the sub-pixel is located, so that in the second frame of the second picture, in the luminous stage of the sub-pixel, and in the remaining display frames of the second picture, the cathode voltage of the light-emitting device in the sub-pixel remains at the second power supply voltage.

8. The method for driving a display panel according to claim 5, wherein: The first power supply voltage is determined according to the target brightness of each sub-pixel in the display area in the first picture and the target brightness in the second picture, and the reference power supply voltage of each sub-pixel in the display area; The second power supply voltage is determined according to the reference power supply voltage of each sub-pixel in the display area; Preferably, the step of determining the first power supply voltage corresponding to any display area includes: Determine a voltage adjustment parameter corresponding to the display area; wherein the voltage adjustment parameter is determined based on a target brightness of each of the sub-pixels in the display area in the first picture and a target brightness in the second picture; Determine a first power supply voltage corresponding to the display area according to the voltage adjustment parameter and a reference power supply voltage of each sub-pixel in the display area; Preferably, the voltage adjustment parameter is determined based on a ratio or a difference between a target brightness of each sub-pixel in the display area in the first picture and a target brightness of each sub-pixel in the second picture.

9. The method for driving a display panel according to claim 8, characterized in that: Determining a first power supply voltage corresponding to the display area according to the voltage adjustment parameter and a reference power supply voltage of each sub-pixel in the display area includes: The product of the voltage adjustment parameter and the reference voltage statistical value is used as the first power supply voltage; wherein the reference voltage statistical value is an average value of the reference power supply voltages of the sub-pixels in the display area, or a reference power supply voltage of any sub-pixel in the display area; Preferably, if the target brightness of each of the sub-pixels in the display area in the second picture is greater than the target brightness of the corresponding sub-pixel in the first picture, the voltage adjustment parameter corresponding to the display area is greater than 1; If the target brightness of each of the sub-pixels in the display area in the second picture is lower than the target brightness of the corresponding sub-pixel in the first picture, then the voltage adjustment parameter corresponding to the display area is lower than 1.

10. The method for driving a display panel according to claim 8, characterized in that: The second power supply voltage corresponding to the display area is a reference voltage statistic corresponding to the display area; wherein the reference voltage statistic is an average value of the reference power supply voltages of each sub-pixel in the display area, or a reference power supply voltage of any sub-pixel in the display area.

Images