Display panel, display module, display device and display driving method

Abstract

The invention provides a display panel, a display module, a display device and a display driving method, and relates to the technical field of display, the display panel comprises a plurality of sub-pixels, and a pixel circuit of each sub-pixel comprises a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the plurality of sub-pixels at least comprise a first sub-pixel and a second sub-pixel; the capacitance value of the pixel capacitor of the first sub-pixel is not equal to that of the pixel capacitor of the second sub-pixel, and the color of light emitted by the light-emitting element of the first sub-pixel is different from that of light emitted by the light-emitting element of the second sub-pixel; and a plurality of initialization signal lines, wherein the light-emitting elements of the first sub-pixels and the light-emitting elements of the second sub-pixels are electrically connected with different initialization signal lines. Color cast abnormity of a display picture is avoided, and the display picture quality of the display panel can be improved.

Description

Technical Field

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

[0002] In some current display devices, due to the different numbers, arrangements and areas of R / G / B pixels in the pixel units, the pixel capacitances corresponding to the light-emitting elements in the R / G / B pixels are different in size, and the minimum voltages at which the light-emitting elements of the R / G / B pixels reach light emission are also different, which will cause different lighting times of the R / G / B pixels, and the pixel capacitances are like the parasitic capacitances of the light-emitting diodes.

[0003] When the current flowing through the light-emitting element is small, the difference in lighting time caused by different pixel capacitance and different turn-on voltage of the light-emitting element is more obvious. Especially when the display device is turned on, the difference in lighting time of R / G / B pixels will cause the display screen to have color cast abnormality. Summary of the invention

[0004] The present application provides a display panel, a display module, a display device and a display driving method, which can solve the problem of color cast abnormality in a display screen caused by differences in pixel lighting time.

[0005] In a first aspect, the present application provides a display panel, the display panel comprising:

[0006] A plurality of sub-pixels, wherein the pixel circuit of the sub-pixel comprises a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the plurality of sub-pixels comprises at least a first sub-pixel and a second sub-pixel; the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel have different capacitance values, and the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel emit light of different colors;

[0007] A plurality of initialization signal lines are provided, and the light emitting element of the first sub-pixel and the light emitting element of the second sub-pixel are electrically connected to different initialization signal lines.

[0008] Optionally, the pixel circuit includes:

[0009] a first reset module, the first reset module being electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively, and being configured to transmit a first initialization voltage input from the first initialization terminal to the first node under the control of a first reset control signal input from the first reset control terminal, so as to reset the first node and the light-emitting element electrically connected to the first node, or to compensate and charge the pixel capacitance of the light-emitting element based on the first node;

[0010] The first initialization end of the first sub-pixel and the first initialization end of the second sub-pixel are electrically connected to different first voltage signal lines; and the initialization signal lines include the first voltage signal lines.

[0011] Optionally, the pixel circuit includes:

[0012] a first reset module, the first reset module being electrically connected to the first node, the first reset control terminal, and the first initialization terminal respectively, and being configured to transmit a first initialization voltage inputted from the first initialization terminal to the first node under the control of a first reset control signal inputted from the first reset control terminal, so as to reset the first node and the light emitting element electrically connected to the first node;

[0013] a second reset module, the second reset module being electrically connected to the first node, the second reset control terminal, and the second initialization terminal respectively, and being configured to transmit a second initialization voltage input from the second initialization terminal to the first node under the control of a second reset control signal input from the second reset control terminal, so as to compensate and charge the pixel capacitor based on the first node;

[0014] The second initialization end of the first sub-pixel and the second initialization end of the second sub-pixel are electrically connected to different second voltage signal lines, and the initialization signal lines include the second voltage signal line.

[0015] Optionally, the second resetting module includes:

[0016] A first transistor, wherein the control electrode of the first transistor is electrically connected to the second reset signal line of the display panel, and the control electrode of the first transistor serves as the second reset control terminal; the first electrode of the first transistor is electrically connected to the second voltage signal line, and the first electrode of the first transistor serves as the second initialization terminal; the second electrode of the first transistor is electrically connected to the first node.

[0017] Optionally, the second reset control terminal of the first sub-pixel and the second reset control terminal of the second sub-pixel are electrically connected to the same second reset signal line.

[0018] In a second aspect, an embodiment of the present application provides a display module, which includes a display driving circuit and a display panel as described in the first aspect; the display panel is electrically connected to the display driving circuit.

[0019] In a third aspect, an embodiment of the present application provides a display device, wherein the display device comprises the display module as described in the second aspect.

[0020] In a fourth aspect, an embodiment of the present application provides a display driving method, the display driving method comprising:

[0021] In a target frame, a pixel circuit of a sub-pixel in a display panel is controlled to charge a pixel capacitor corresponding to a light-emitting element in the pixel circuit; wherein the target frame includes at least the first frame of a display frame, and / or one or more compensation frames before the display frame.

[0022] A display panel, a display module, a display device and a display driving method provided by the present application have at least the following advantages: the display panel includes a plurality of sub-pixels and a plurality of initialization signal lines. The pixel circuit of the sub-pixel includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element, and the plurality of sub-pixels include at least a first sub-pixel and a second sub-pixel. Since the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel emit light of different colors, the first sub-pixel and the second sub-pixel are sub-pixels of different colors, and the capacitance values ​​of the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel are not equal. The light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel are electrically connected to different initialization signal lines, so that initialization voltages of different voltage values ​​can be provided to the first sub-pixel and the second sub-pixel through the initialization signal line. In this way, the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel can be charged to the turn-on voltage of the light-emitting element in the same or similar time, so that the light-on time of the light-emitting element in the first sub-pixel and the second sub-pixel is roughly the same, avoiding the abnormal phenomenon of color cast in the display screen when the screen is turned on, and improving the display screen quality of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 is a structural schematic diagram of a display panel provided in an embodiment of the present application;

[0025] Figure 2 This is one of the structural schematic diagrams of a pixel circuit provided in an embodiment of the present application;

[0026] Figure 3 This is the second structural schematic diagram of a pixel circuit provided in an embodiment of the present application;

[0027] Figure 4 It is a waveform diagram of data voltage and screen brightness in the related art;

[0028] Figure 5 is a flowchart of the steps of a display driving method provided by an embodiment of the present application

[0029] Figure 6 is one of the schematic diagrams of the logic of a display driving method provided by an embodiment of the present application;

[0030] Figure 7 is a waveform diagram of a display driving method provided by an embodiment of the present application;

[0031] Figure 8 is one of the timing diagrams of a display driving method provided by an embodiment of the present application;

[0032] Fig. 9 is the second schematic diagram of the logic of a display driving method provided by an embodiment of the present application;

[0033] Fig.10 is the second timing diagram of a display driving method provided by an embodiment of the present application;

[0034] Fig.11 is the third timing diagram of a display driving method provided by an embodiment of the present application;

[0035] Fig.12 is the fourth timing diagram of a display driving method provided by an embodiment of the present application. Detailed implementation manners

[0036] Next, the technical solutions in some embodiments will be clearly and completely described in conjunction with the accompanying drawings in some embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] Currently, in display products such as Organic Light Emitting Diode (OLED), the number, arrangement, and area of R / G / B pixels in a pixel unit are different. Due to the display panel structure and Electroluminescent Material (EL), the parasitic capacitance of the light-emitting diodes in the pixels is different, and the minimum voltage (turn-on voltage Vop) when the light-emitting diodes reach luminescence is also different. For example, in a pixel unit of a mobile phone product, there are usually 2 G pixels, 1 R pixel and 1 B pixel each. The blue (B) pixel occupies 1 / 2 area, and the red (R) pixel and the green (G) pixel each occupy 1 / 4. The parasitic capacitance Coled of the light-emitting diode is B pixel > G pixel > R pixel, and the turn-on voltage Vop of the light-emitting diode is B pixel < R pixel < G pixel.

[0038] For example, the parasitic capacitance Coled in the R pixel is 50 femtofarad (fF), the parasitic capacitance Coled in the G pixel is 105 fF, and the parasitic capacitance Coled in the B pixel is 150 fF, that is, the parasitic capacitance Coled is B>G>R.

[0039] Normally, the parasitic capacitance Coled and the turn-on voltage Vop of the light-emitting diode have little effect on the display effect. However, at low brightness, the driving transistor in the pixel circuit is turned on very small, the current flowing through the light-emitting diode is extremely small, and the light-emitting control signal EM is turned on for a short time, which will cause the influence of the parasitic capacitance Coled and the turn-on voltage Vop to become obvious. Especially in the first frame of the screen after powering on, the data line Data needs to charge the parasitic capacitance Coled first before the light-emitting diode can emit light. Different capacitance sizes and different turn-on voltages Vop cause different lighting times for the R / G / B pixels, which will cause color cast abnormalities when the power is turned on. For example, the turn-on voltage Vop of the G pixel is the largest, and the G pixel lights up the slowest, then the display screen may be reddish or bluish when the power is turned on.

[0040] Figure 1 is a schematic diagram of the structure of a display panel 10 provided in an embodiment of the present application. The display panel 10 includes:

[0041] A plurality of sub-pixels, wherein the pixel circuit 101 of the sub-pixel includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the plurality of sub-pixels include at least a first sub-pixel and a second sub-pixel; the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel have different capacitance values, and the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel emit light of different colors;

[0042] There are a plurality of initialization signal lines 102 , and the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel are electrically connected to different initialization signal lines 102 .

[0043] In some embodiments, the display panel 10 includes a pixel array formed by arraying pixels in row and column directions, and the pixels include multiple sub-pixels, and the multiple sub-pixels include sub-pixels of different colors, such as red pixels, green pixels, and blue pixels. The sub-pixels include a pixel circuit 101, and the pixel circuit 101 includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element. Among them, the light-emitting element can be a light-emitting diode, such as OLED, active matrix organic light-emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED), etc. The pixel capacitor corresponding to the light-emitting element can be a parasitic capacitor of the light-emitting diode. Among them, the pixel capacitor is used to drive the light-emitting element to emit light.

[0044] In some embodiments, the plurality of sub-pixels include at least two sub-pixels of different colors, namely, a first sub-pixel and a second sub-pixel, wherein the color of the light emitted by the light emitting element of the first sub-pixel is a first color, and the color of the light emitted by the second sub-pixel is a second color, and the first color is different from the second color. The first color and the second color may be two different colors of the three colors of RGB, respectively.

[0045] In some embodiments, the pixel capacitance of the first sub-pixel is different from the pixel capacitance of the second sub-pixel, that is, the capacitance values ​​of the two are not equal. The size of the pixel capacitance may be related to the area occupied by the sub-pixel in the pixel unit. For example, the B pixel occupies the largest area, and the corresponding pixel capacitance of the B pixel is the largest. Since the capacitance values ​​of the pixel capacitance of the first sub-pixel and the second sub-pixel are not equal, the time required for the two to be filled is also different, so the capacitance difference of the pixel capacitance may cause the difference in the lighting time of sub-pixels of different colors.

[0046] In some embodiments, the light-emitting element is electrically connected to the initialization signal line 102, and can receive the initialization voltage transmitted by the initialization signal line 102. For example, the anode of the light-emitting diode is electrically connected to the initialization signal line 102, and the initialization voltage is usually a negative voltage, which can eliminate the positive charge of the anode of the light-emitting diode, thereby resetting the light-emitting diode. In this embodiment, the initialization signal lines 102 electrically connected to the light-emitting elements of sub-pixels of different colors are separated, that is, the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel are electrically connected to different initialization signal lines 102, so that the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel can receive initialization voltages of different voltage values.

[0047] In some embodiments, in order to make the lighting time of sub-pixels of different colors consistent, the pixel capacitors of sub-pixels of different colors can be charged to a voltage equal to or slightly lower than the turn-on voltage of the light-emitting element at the same or similar time. Specifically, the pixel capacitor of the sub-pixel that lights up slower than the first sub-pixel and the second sub-pixel can be compensated and charged, or the pixel capacitors of the first sub-pixel and the second sub-pixel can be compensated and charged at the same time, and the voltages or durations of the compensation charging of the two sub-pixels are different, so that when the pixel capacitors of the two sub-pixels are compensated and charged, they are simultaneously charged to a voltage close to the turn-on voltage of the light-emitting element.

[0048] In some embodiments, an initialization voltage is provided to the initialization signal line 102, and the pixel circuit 101 is controlled to transmit the initialization voltage to the light-emitting element, and the pixel capacitor corresponding to the light-emitting element is pre-charged by the initialization voltage. In this embodiment, the pre-charging of the pixel capacitor by the initialization voltage is called compensation charging. Among them, the initialization voltage for compensation charging can be sent to one of the first sub-pixel and the second sub-pixel, or initialization voltages of different voltage values ​​can be sent to the first sub-pixel and the second sub-pixel respectively, for compensating charging the pixel capacitor, which is not limited in the embodiment of the present application.

[0049] In the embodiment of the present application, the display panel 10 includes a plurality of sub-pixels and a plurality of initialization signal lines 102. The pixel circuit 101 of the sub-pixel includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element, and the plurality of sub-pixels includes at least a first sub-pixel and a second sub-pixel. Since the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel emit light of different colors, the first sub-pixel and the second sub-pixel are sub-pixels of different colors, and the capacitance values ​​of the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel are not equal. The light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel are electrically connected to different initialization signal lines 102, so the initialization voltages of different voltage values ​​can be provided to the first sub-pixel and the second sub-pixel through the initialization signal line 102. In this way, the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel can be charged to the turn-on voltage of the light-emitting element in the same or similar time, so that the light-on time of the light-emitting element in the first sub-pixel and the second sub-pixel is roughly the same, avoiding the abnormal phenomenon of color cast in the display screen when the screen is turned on, and improving the display screen quality of the display panel 10.

[0050] Optionally, the pixel circuit 101 includes:

[0051] A first reset module 1011, the first reset module 1011 is electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively, and is configured to transmit a first initialization voltage input from the first initialization terminal to the first node under the control of a first reset control signal input from the first reset control terminal, so as to reset the first node and the light-emitting element electrically connected to the first node, or to compensate and charge the pixel capacitance of the light-emitting element based on the first node;

[0052] The first initialization end of the first sub-pixel and the first initialization end of the second sub-pixel are electrically connected to different first voltage signal lines 1021 ; the initialization signal line 102 includes the first voltage signal line 1021 .

[0053] In some embodiments, the pixel circuit 101 includes a first reset module 1011, and the light-emitting element is electrically connected to the initialization signal line 102 via the first reset module 1011. The first reset modules 1011 of sub-pixels of different colors are electrically connected to different initialization signal lines 102, so that initialization voltages of different voltage values ​​can be input to the pixel circuits 101 of sub-pixels of different colors via the initialization signal lines 102 to compensate and charge the pixel capacitance of the light-emitting element.

[0054] Specifically, the intermediate node between the light emitting element and the first reset module 1011 is the first node, and the pixel circuit 101 further includes a first reset control terminal and a first initialization terminal. The first reset control terminal can be electrically connected to the first reset signal line of the display panel 10 to receive the first reset control signal. The first initialization terminal can be electrically connected to the first voltage signal line 1021, and the first initialization terminal can receive the first initialization voltage transmitted by the first voltage signal line 1021. Among them, the first voltage signal line 1021 is the initialization signal line 102, and the light emitting elements of different color sub-pixels are electrically connected to different first voltage signal lines 1021.

[0055] The first reset module 1011 is electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively, and can transmit the first initialization voltage input from the first initialization terminal to the first node under the control of the first reset control signal input from the first reset control terminal, and then to the light-emitting element. For example, the first node is the middle node between the anode of the light-emitting diode and the first reset module 1011, and the first initialization voltage can be transmitted to the anode of the light-emitting diode through the first node. The pixel capacitance is the parasitic capacitance of the light-emitting diode, and the parasitic capacitance is equivalent to being connected in parallel with the light-emitting diode, so the first initialization voltage can also be transmitted to the parasitic capacitance of the light-emitting diode through the first node.

[0056] In some embodiments, in the pixel circuit 101 of the first sub-pixel, the first initialization terminal is electrically connected to a first voltage signal line 1021, and is connected to the power module of the display driving circuit of the display panel 10 through the first voltage signal line 1021, and can receive the initialization voltage for resetting and the initialization voltage for compensating charging sent by the power module. Similarly, in the pixel circuit 101 of the second sub-pixel, the first initialization terminal is electrically connected to another first voltage signal line 1021, and is connected to the power module of the display driving circuit of the display panel 10 through the first voltage signal line 1021, so that the first initialization terminal of the first sub-pixel and the first initialization terminal of the second sub-pixel are electrically connected to different first voltage signal lines 1021.

[0057] Figure 2 1 is one of the structural diagrams of a pixel circuit 101 provided in an embodiment of the present application. Figure 2As shown, the light emitting element in the pixel circuit 101 is a light emitting diode (OLED), and the pixel capacitor is the parasitic capacitor (Coled) of the OLED. The first reset module 1011 in the pixel circuit 101 includes a thin film transistor T7, an intermediate node N4 between the OLED and the transistor T7 is a first node, the gate of the transistor T7 serves as the first reset control terminal of the pixel circuit 101, the source / drain of the transistor T7 serves as the first initialization terminal of the pixel circuit 101, and the other electrode of the transistor T7 is electrically connected to the node N4. Figure 2 As shown, the transistor T7 is electrically connected to the first voltage signal line 1021 (Vinit2), and the Vinit2 signal line is an initialization signal line 102, which can transmit the first initialization voltage (Vinit2 voltage). The transistor T7 is a P-type transistor. When the first reset control signal (RSTV_H) input by the first reset control terminal is at a low level, the transistor T7 is turned on, so that the Vinit2 voltage is transmitted to the node N4. In this embodiment, the transistor T7 in the pixel circuit 101 of the first sub-pixel and the second sub-pixel is electrically connected to different Vinit2 signal lines.

[0058] like Figure 2 As shown, the pixel circuit 101 further includes transistors T1 to T6, a transistor T8, and a capacitor Cst. The transistor T1 is electrically connected to the RSTV_P signal line, the Vinit1 signal line, and the node N3, respectively. The transistor T2 is electrically connected to the NSTV signal line, the node N1, and the node N3, respectively. The transistor T3 is electrically connected to the node N1, the node N2, and the node N3, respectively. The transistor T4 is electrically connected to the GSTV signal line, the Data[m] signal line, and the node N2, respectively. The transistor T5 is electrically connected to the ESTV signal line, the ELVDD signal line, and the node N2, respectively. The transistor T6 is electrically connected to the ESTV signal line, the node N3, and the node N4, respectively. The transistor T8 is electrically connected to the RSTV_H signal line, the Vinit3 signal line, and the node N2, respectively.

[0059] In the embodiment of the present application, the pixel circuit 101 includes a first reset module 1011, the first reset module 1011 is electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively, the first initialization terminal of the first sub-pixel and the first initialization terminal of the second sub-pixel are electrically connected to different first voltage signal lines 1021, and the initialization signal line 102 includes a first voltage signal line 1021. In this way, the light-emitting elements of the first sub-pixel and the second sub-pixel are electrically connected to different initialization signal lines 102 through the first node and the first reset module 1011. Since the pixel circuit 101 is configured to transmit the first initialization voltage inputted from the first initialization terminal to the first node under the control of the first reset control signal inputted from the first reset control terminal, so as to reset the first node and the light-emitting element electrically connected to the first node, or to compensate and charge the pixel capacitance of the light-emitting element based on the first node. In this way, by adjusting the connection relationship of the initialization signal line 102 on the display panel 10, the first initialization voltage can be provided to the pixel circuits 101 of the first sub-pixel and the second sub-pixel respectively. By changing the voltage value of the first initialization voltage, the reset function of the light-emitting element and the compensatory charging function of the pixel capacitor can be realized, which is beneficial to reducing the cost of the display panel 10.

[0060] Optionally, the pixel circuit 101 includes:

[0061] A first reset module 1011, the first reset module 1011 is electrically connected to the first node, the first reset control terminal, and the first initialization terminal, respectively, and is configured to transmit a first initialization voltage input from the first initialization terminal to the first node under the control of a first reset control signal input from the first reset control terminal, so as to reset the first node and the light-emitting element electrically connected to the first node;

[0062] A second reset module 1012, the second reset module 1012 is electrically connected to the first node, the second reset control terminal, and the second initialization terminal, respectively, and is configured to transmit the second initialization voltage input from the second initialization terminal to the first node under the control of the second reset control signal input from the second reset control terminal, so as to compensate and charge the pixel capacitor based on the first node;

[0063] The second initialization end of the first sub-pixel and the second initialization end of the second sub-pixel are electrically connected to different second voltage signal lines 1022 , and the initialization signal line 102 includes the second voltage signal line 1022 .

[0064] In some embodiments, the pixel circuit 101 includes a first reset module 1011 and a second reset module 1012, the light-emitting element is electrically connected to the first node, the first node is electrically connected to an initialization signal line 102 through the first reset module 1011, and the first node is electrically connected to another initialization signal line 102 through the second reset module 1012. Among them, the first reset module 1011 is specifically used to reset the light-emitting element, and the structure of the first reset module 1011 can be the same as the first reset module 1011 of the aforementioned embodiment, but the second reset module 1012 is specifically used to control the compensation charging of the pixel capacitance of the light-emitting element. The second reset modules 1012 of different color sub-pixels are electrically connected to different initialization signal lines 102, so that the initialization voltages of different voltage values ​​can be input to the pixel circuits 101 of different color sub-pixels through the second reset module 1012 to compensate for the pixel capacitance of the light-emitting element.

[0065] Specifically, the pixel circuit 101 also includes a second reset control terminal and a second initialization terminal. The second reset control terminal can be electrically connected to the second reset signal line of the display panel 10 to receive a second reset control signal. The second initialization terminal can be electrically connected to the second voltage signal line 1022, and the second initialization terminal can receive a second initialization voltage transmitted by the second voltage signal line 1022. Among them, the second voltage signal line 1022 is the initialization signal line 102, and the light-emitting elements of different color sub-pixels are electrically connected to different second voltage signal lines 1022. The second reset module 1012 is electrically connected to the first node, the second reset control terminal, and the second initialization terminal, respectively, and can transmit the second initialization voltage input from the second initialization terminal to the first node under the control of the second reset control signal input from the second reset control terminal, and then to the light-emitting element.

[0066] In some embodiments, in the pixel circuit 101 of the first sub-pixel, the second initialization terminal is electrically connected to a second voltage signal line 1022, and is connected to the power module of the display driving circuit of the display panel 10 through the second voltage signal line 1022, and can receive the initialization voltage for compensating charging sent by the power module, that is, the second initialization voltage. Similarly, in the pixel circuit 101 of the second sub-pixel, the second initialization terminal is electrically connected to another second voltage signal line 1022, and is connected to the power module of the display driving circuit of the display panel 10 through the second voltage signal line 1022, so that the second initialization terminal of the first sub-pixel and the second initialization terminal of the second sub-pixel are electrically connected to different second voltage signal lines 1022.

[0067] Optionally, the second resetting module 1012 includes:

[0068] The first transistor T9, the control electrode of the first transistor T9 is electrically connected to the second reset signal line of the display panel 10, and the control electrode of the first transistor T9 serves as the second reset control terminal; the first electrode of the first transistor T9 is electrically connected to the second voltage signal line 1022, and the first electrode of the first transistor T9 serves as the second initialization terminal; the second electrode of the first transistor T9 is electrically connected to the first node.

[0069] In some embodiments, the first transistor T9 may be a thin film transistor (TFT) or a metal oxide semiconductor (MOS) field effect transistor, the first transistor T9 may be an N-type transistor or a P-type transistor, the control electrode of the first transistor T9 may be a gate, the first electrode may be a source / drain, and the second electrode may be a drain / source. This is only an example, and the embodiments of the present application are not limited thereto.

[0070] In some embodiments, the control electrode of the first transistor T9 is electrically connected to the second reset signal line on the display panel 10 as the second reset control terminal, the first transistor T9 and the first electrode are electrically connected to the second voltage signal line 1022 on the display panel 10 as the second initialization terminal, and the second electrode of the first transistor T9 is electrically connected to the first node. The first transistor T9 can be turned on under the control of the second reset control signal input to the second reset control terminal, and the second initialization voltage input to the second initialization terminal is transmitted to the first node, so as to compensate and charge the pixel capacitance of the light-emitting element based on the first node.

[0071] Figure 3 FIG. 2 is a second structural diagram of a pixel circuit 101 provided in an embodiment of the present application. Figure 3 As shown, the second reset module 1012 in the pixel circuit 101 includes a first transistor T9, the gate of the transistor T9 serves as the second reset control terminal of the pixel circuit 101, the source / drain of the transistor T9 serves as the second initialization terminal of the pixel circuit 101, and the other electrode of the transistor T9 is electrically connected to the first node (node ​​N4). Figure 3 As shown, the transistor T9 is electrically connected to the second voltage signal line 1022 (Vinit4), and the Vinit4 signal line is an initialization signal line 102, which can transmit the second initialization voltage (Vinit4 voltage). The transistor T9 is a P-type transistor. When the second reset control signal (RSTV_C) input by the second reset control terminal is at a low level, the transistor T9 is turned on, so that the Vinit4 voltage is transmitted to the node N4. In this embodiment, the transistor T9 in the pixel circuit 101 of the first sub-pixel and the second sub-pixel is electrically connected to different Vinit4 signal lines.

[0072] like Figure 3As shown, the pixel circuit 101 also includes transistors T1 to T8, and a capacitor Cst. The transistor T1 is electrically connected to the RSTV_P signal line, the Vinit1 signal line, and the node N3, respectively. The transistor T2 is electrically connected to the NSTV signal line, the node N1, and the node N3, respectively. The transistor T3 is electrically connected to the node N1, the node N2, and the node N3, respectively. The transistor T4 is electrically connected to the GSTV signal line, the Data[m] signal line, and the node N2, respectively. The transistor T5 is electrically connected to the ESTV signal line, the ELVDD signal line, and the node N2, respectively. The transistor T6 is electrically connected to the ESTV signal line, the node N3, and the node N4, respectively. The transistor T7 is electrically connected to the RSTV_H signal line, the Vinit2 signal line, and the node N4, respectively. The transistor T8 is electrically connected to the RSTV_H signal line, the Vinit3 signal line, and the node N2, respectively. When the pixel capacitor is compensated and charged by the Vinit4 voltage, the voltage values ​​of the Vinit1-3 voltages are not limited in this embodiment. For example, the Vinit1 voltage may be -4V, the Vinit2 voltage may be -0.8, and the Vinit3 voltage may be 6.8V.

[0073] In the embodiment of the present application, the second reset module 1012 includes a first transistor T9, the control electrode of the first transistor T9 is electrically connected to the second reset signal line of the display panel 10, the control electrode of the first transistor T9 serves as a second reset control terminal, the first electrode of the first transistor T9 is electrically connected to the second voltage signal line 1022, the first electrode of the first transistor T9 serves as a second initialization terminal, and the second electrode of the first transistor T9 is electrically connected to the first node. In this way, the first transistor T9 can be used to simply and conveniently control the compensation charging of the pixel capacitor, thereby improving the practicality of the display panel 10.

[0074] In the embodiment of the present application, the pixel circuit 101 includes a first reset module 1011 and a second reset module 1012, the first reset module 1011 is electrically connected to the first node, the first reset control terminal, and the first initialization terminal respectively, the second reset module 1012 is electrically connected to the first node, the second reset control terminal, and the second initialization terminal respectively, the second initialization terminal of the first sub-pixel and the second initialization terminal of the second sub-pixel are electrically connected to different second voltage signal lines 1022, and the initialization signal line 102 includes a second voltage signal line 1022. In this way, the light-emitting elements of the first sub-pixel and the second sub-pixel are electrically connected to different initialization signal lines 102 through the first node and the second reset module 1012. Since the pixel circuit 101 is configured to transmit the first initialization voltage inputted from the first initialization terminal to the first node under the control of the first reset control signal inputted from the first reset control terminal, so as to reset the first node and the light-emitting element electrically connected to the first node, and transmit the second initialization voltage inputted from the second initialization terminal to the first node under the control of the second reset control signal inputted from the second reset control terminal, so as to compensate and charge the pixel capacitance based on the first node. In this way, a first initialization voltage with the same voltage value can be provided to the pixel circuit 101 of the first sub-pixel and the second sub-pixel to realize the reset function of the light-emitting element, and a second initialization voltage with different voltage values ​​can be provided to the pixel circuit 101 of the first sub-pixel and the second sub-pixel respectively to realize the compensatory charging function of the pixel capacitor. The reset function and the compensatory charging function do not interfere with each other, making the driving control of the display panel 10 more flexible.

[0075] Optionally, the second reset control terminal of the first sub-pixel and the second reset control terminal of the second sub-pixel are electrically connected to the same second reset signal line.

[0076] In some embodiments, in the pixel circuits 101 of sub-pixels of different colors, the second reset control terminal of the second reset module 1012 is electrically connected to the same second reset signal line. Specifically, the second reset control terminal in the pixel circuits 101 of the first sub-pixel and the second sub-pixel is connected to the same second reset signal line, so that the second reset control signal transmitted by the second reset signal line can simultaneously control the second reset module 1012 to turn on. For example, the second reset control signal controls the first transistors T9 in the first sub-pixel and the second sub-pixel to turn on at the same time, so as to simultaneously transmit the second initialization voltage input from the second initialization terminal to the first node in each pixel circuit 101.

[0077] In this way, the pixel circuit 101 in the first sub-pixel and the second sub-pixel can start to compensate for the charging of the pixel capacitor at the same time, avoiding differences in the charging start time of sub-pixels of different colors, which is beneficial for charging the capacitor voltage corresponding to the pixel capacitor of sub-pixels of different colors to the turn-on voltage of the light-emitting element within the same time, thereby making the lighting time of sub-pixels of different colors roughly the same.

[0078] In some embodiments, the first sub-pixel is a G pixel, and the color of the light emitted by the light-emitting element of the first sub-pixel is green, and the second sub-pixel is an R pixel or a B pixel, that is, the color of the light emitted by the light-emitting element of the second sub-pixel is red or blue. In addition, the turn-on voltage of the light-emitting element in the G pixel is greater than the turn-on voltage of the light-emitting element in the R / B pixel. For example, each pixel unit on the display panel 10 includes R / G / B pixels, wherein the turn-on voltage Vop of the light-emitting diode of the G pixel is the largest, while the turn-on voltage Vop of the light-emitting diode of the R / B pixel is smaller.

[0079] In some embodiments, in order to make the light-on time of the light-emitting elements in the first sub-pixel and the second sub-pixel roughly the same, the pixel capacitors in the first sub-pixel and the second sub-pixel need to be charged to the turn-on voltage of the light-emitting elements in the same time. Since the turn-on voltage of the light-emitting element in the first sub-pixel is greater than the turn-on voltage of the light-emitting element in the second sub-pixel, when the pixel capacitor is compensated for charging according to the initialization voltage, the initialization voltage corresponding to the first sub-pixel can be set to be larger, that is, the initialization voltage value corresponding to the first sub-pixel is greater than the initialization voltage value corresponding to the second sub-pixel. In this way, the charging speed of the pixel capacitor of the G pixel can be accelerated, the charging time can be shortened, and the light-on time of the G pixel and the R / B pixel can be roughly the same.

[0080] The embodiment of the present application further provides a display module, which includes a display driving circuit and a display panel 10 as described in the above embodiment; the display panel 10 is electrically connected to the display driving circuit.

[0081] In some embodiments, the display driving circuit is electrically connected to the pixel circuit 101 of each sub-pixel on the display panel 10, and can send a control signal to the pixel circuit 101 to control the pixel circuit 101 to compensate and charge the pixel capacitor according to the initialization voltage of the initialization signal line 102, so that the pixel capacitor of the first sub-pixel and the second sub-pixel are charged to the turn-on voltage of the light-emitting element in the same or similar time, so that the lighting time of the light-emitting elements in the first sub-pixel and the second sub-pixel is approximately the same.

[0082] Optionally, the display driving circuit includes a power module, which is electrically connected to multiple initialization signal lines 102 of the display panel 10 and is configured to provide initialization voltages of different voltage values ​​to the initialization signal lines 102 corresponding to the first sub-pixel and the second sub-pixel of the display panel 10.

[0083] In some embodiments, a power module in a display driving circuit provides an initialization voltage to an initialization signal line 102 on a display panel 10, the display panel 10 includes a plurality of initialization signal lines 102, the power module may include a plurality of voltage output terminals, and the light-emitting elements of the first sub-pixel and the second sub-pixel may be electrically connected to different voltage output terminals in the power module through their respective corresponding initialization signal lines 102.

[0084] In this way, the display driving circuit can also include a control module. Under the control of the control module, the power supply module can provide initialization voltages of different voltage values ​​to the initialization signal lines 102 corresponding to the first sub-pixel and the second sub-pixel respectively through different voltage output terminals to meet the compensation charging requirements corresponding to the first sub-pixel and the second sub-pixel respectively, so that the capacitor voltages corresponding to the pixel capacitors of the first sub-pixel and the second sub-pixel are charged to the turn-on voltage of the light-emitting element at the same or similar time, and the light-emitting elements of the first sub-pixel and the second sub-pixel can emit light at the same time, so that the lighting time of sub-pixels of different colors is roughly the same.

[0085] Optionally, the power module is electrically connected to a plurality of first voltage signal lines 1021 of the display panel 10;

[0086] The power supply module is configured to provide first initialization voltages of different voltage values ​​to the first voltage signal lines 1021 corresponding to the first sub-pixel and the second sub-pixel, so that the pixel circuits 101 of the first sub-pixel and the second sub-pixel respectively charge the pixel capacitors according to the first initialization voltages.

[0087] Alternatively, a first initialization voltage with the same voltage value is provided to the plurality of first voltage signal lines 1021 , so that the pixel circuit 101 resets the first node and the light emitting element connected to the first node according to the first initialization voltage.

[0088] In some embodiments, the power module in the display driving circuit can provide a first initialization voltage with the same voltage value to the plurality of first voltage signal lines 1021 on the display panel 10, such as providing a negative voltage Vinit2 voltage, to reset the first node and the light-emitting element electrically connected to the first node. For example, the Vinit2 voltage is -1V. Figure 2 Node N4 and the OLED anode are shown reset.

[0089] Alternatively, the power module in the display driving circuit can provide a first initialization voltage of different voltage values ​​to the first voltage signal line 1021 corresponding to the first sub-pixel and the second sub-pixel on the display panel 10, such as setting the Vinit2 voltage to a high voltage, and the Vinit2 voltages corresponding to sub-pixels of different colors are different, and the larger the turn-on voltage of the light-emitting element, the larger the corresponding Vinit2 voltage, and the pixel capacitance of the light-emitting element is compensated and charged based on the first node. For example, the turn-on voltage Vop of the OLED in the G pixel is the largest, and the Vinit2 voltage corresponding to the G pixel is set to 0.7V, while the turn-on voltage Vop of the OLED in the R / B pixel is smaller, and the Vinit2 voltage corresponding to the R / B pixel is 0.2 / 0.1V.

[0090] Optionally, the power module is electrically connected to the plurality of first voltage signal lines 1021 of the display panel 10, and is configured to provide a first initialization voltage with the same voltage value to the plurality of first voltage signal lines 1021, so that the pixel circuit 101 resets the first node and the light-emitting element connected to the first node according to the first initialization voltage;

[0091] The power module is also electrically connected to multiple second voltage signal lines 1022 of the display panel 10, and is configured to provide a second initialization voltage of different voltage values ​​to the second voltage signal lines 1022 corresponding to the first sub-pixel and the second sub-pixel, so that the pixel circuits 101 of the first sub-pixel and the second sub-pixel respectively charge the pixel capacitor according to the second initialization voltage.

[0092] In some embodiments, the power module in the display driving circuit is electrically connected to the multiple first voltage signal lines 1021 of the display panel 10, and can provide the multiple first voltage signal lines 1021 on the display panel 10 with a first initialization voltage of the same voltage value, such as providing a negative voltage Vinit2 voltage, to reset the first node and the light-emitting element electrically connected to the first node. For example, the Vinit2 voltage is -1V, Figure 3 Node N4 and the OLED anode are shown reset.

[0093] In addition, the power module in the display driving circuit is electrically connected to the plurality of second voltage signal lines 1022 of the display panel 10, and can provide second initialization voltages of different voltage values ​​to the second voltage signal lines 1022 corresponding to the first sub-pixel and the second sub-pixel on the display panel 10, such as providing a positive Vinit4 voltage, and the Vinit4 voltages corresponding to sub-pixels of different colors are different in magnitude, and the larger the turn-on voltage of the light-emitting element, the larger the corresponding Vinit4 voltage, and the pixel capacitance of the light-emitting element is compensated and charged based on the first node. For example, the turn-on voltage Vop of the OLED in the G pixel is the largest, and the Vinit4 voltage corresponding to the G pixel is set to 0.7V, while the turn-on voltage Vop of the OLED in the R / B pixel is smaller, and the Vinit4 voltage corresponding to the R / B pixel is 0.2 / 0.1V.

[0094] A display module provided in an embodiment of the present application can achieve the same or similar technical effects as the display panel 10 in the aforementioned embodiment, and will not be described again here to avoid repetition.

[0095] An embodiment of the present application further provides a display device, which includes a display module as described in the above embodiment.

[0096] A display device provided in an embodiment of the present application can achieve the same or similar technical effects as the display panel 10 in the aforementioned embodiment, and will not be described again here to avoid repetition.

[0097] The display panel in the related art is tested at a brightness band of 2 nits, with three grayscales of R128 / G128 / B128. Figure 4 The data voltage output by the source driving circuit of the display panel and the screen brightness test waveform of the display panel are shown. The R pixel and the B pixel light up in the second frame of the display frame, and the G pixel starts to light up in the fourth frame, so the first two frames of the display frame are displayed as purple pictures. Table 1 shows the number of frames of R / G / B lighting under different brightness bars. As shown in Table 1, under low brightness, it is obvious that the G screen lights up later than R and B, which will cause the screen to display purple (reddish and bluish) at the moment of lighting, and the number of delayed frames is inconsistent under different brightness. Among them, Band is the brightness of the W255 screen of the OLED product, such as the position of the brightness bar on the mobile phone, and Band can adjust the screen brightness. Usually the lowest brightness Band is 2nit. In this case, the brightness of the W255 screen is 2nit, and 0~2nit is divided into 255 grayscales, and the brightness distribution meets the Gamma2.2 curve.

[0098] Table 1 Number of frames where R / G / B pixels light up under different brightness bars

[0099]

[0100]

[0101] Figure 5 is a flowchart of a display driving method provided by an embodiment of the present application, such as Figure 5 As shown, the display driving method includes:

[0102] Step S1, in the target frame, controls the pixel circuit 101 of the sub-pixel in the display panel 10 to charge the pixel capacitor corresponding to the light-emitting element in the pixel circuit 101; wherein the target frame includes at least the first frame of the display frame, and / or one or more compensation frames before the display frame.

[0103] The display driving method of this embodiment is used to drive the display panel 10 to light up at the same or similar time when it is powered on in a low-brightness screen, so that sub-pixels of different colors can light up at the same or similar time, thereby improving the color cast abnormality of the display screen when the screen is turned on. Among them, the low-brightness screen is such as a 2nit Band screen. The executor of the display driving method can be a display driving circuit electrically connected to the display panel 10 in the display device. The display driving method can be used to drive the display panel 10 as in the aforementioned embodiment, that is, the display panel 10 in which the light-emitting elements of sub-pixels of different colors are electrically connected to different initialization signal lines 102. Alternatively, the display driving method can also be used to drive a display panel in which sub-pixels of different colors are electrically connected to the same initialization signal line, which is not limited in the embodiments of the present application.

[0104] In some embodiments, the pixel circuits 101 of different color sub-pixels in the display panel 10 can be controlled within a target frame during the display driving process, and the pixel capacitors corresponding to the light-emitting elements in the pixel circuits 101 of each sub-pixel can be compensated and charged, so that the pixel capacitors of the different color sub-pixels are charged to the turn-on voltage of the light-emitting elements at the same or similar time, and then the light-emitting elements of the different color sub-pixels can emit light at the same or similar time, that is, the light-on time corresponding to the light-emitting elements of the different color sub-pixels in the target frame is roughly the same. Among them, the light-on time is roughly the same, which means that the light-emitting elements of the different color sub-pixels can be lit in the same frame, and the difference between the light-on times of the different color sub-pixels is less than or equal to one frame time.

[0105] In some embodiments, the target frame may be the first frame of the display frame, and the pixel circuit 101 controlling the sub-pixels of different colors in the first frame performs compensation charging on the pixel capacitor corresponding to the light-emitting element, so that the screen can be displayed according to the display data sent by the front end starting from the second frame. Alternatively, the target frame may also be a compensation frame before the display frame, and the pixel circuit 101 controlling the sub-pixels of different colors in the compensation frame performs compensation charging on the pixel capacitor corresponding to the light-emitting element, so that the screen can be displayed according to the display data sent by the front end starting from the first frame of the display frame. The number of compensation frames may be 1 frame or multiple frames, and the embodiment of the present application does not limit this. In order to display the boot screen faster, the compensation frame may be set to 1 frame.

[0106] For example, a black frame is usually set before displaying a frame to avoid unnecessary clutter and to allow the display frame to display a stable picture. In this embodiment, two black frames + one compensation frame, or three black frames + one compensation frame can be set. The black frames and the compensation frames are independent of each other. This is only an example, and the embodiment of the present application does not limit this.

[0107] In some embodiments, the display driving circuit can calculate the data voltage for compensating and charging the pixel capacitance according to the display data sent by the front end, which is called the compensation data voltage. The voltage values ​​of the compensation data voltage corresponding to the sub-pixels of different colors are not equal. Then, in the target frame, the source driving circuit (Source IC) of the display panel 10 sends the compensation data voltage to the data signal line of the display panel 10, so that the pixel capacitance of the pixel circuit 101 in the sub-pixels of different colors is compensated and charged by the compensation data voltage. Among them, the front end can be the system-on-chip (System on Chip, SOC) of the host, and the display data can include brightness Band and picture grayscale information, as well as display control instructions, etc.

[0108] In this way, when the first display frame after the target frame arrives, since the capacitor voltage corresponding to the pixel capacitor of the sub-pixel of different colors is charged to the turn-on voltage of the light-emitting element, the light-emitting elements of the sub-pixels of different colors can be lit at the same time, ensuring that the light-on time of the sub-pixels of different colors is consistent and there is no abnormal color deviation when the power is turned on. For display frames other than the target frame, the display driving circuit can obtain a normal data voltage according to the display data, and the source driving circuit provides the data voltage to the display panel 10 to drive the display panel 10 to display the corresponding picture.

[0109] In some embodiments, such as Figure 2As shown, in the initialization stage of the pixel circuit 101, the parasitic capacitance of the light-emitting diode can be pre-charged by the first initialization voltage (Vinit2 voltage), and the voltage of the parasitic capacitance can be charged to be equal to or slightly lower than the turn-on voltage of the light-emitting diode, so that when the data voltage arrives, the light-emitting diode can respond quickly and emit light. The charging time of the Vinit2 voltage is controlled by the effective level duration of the reset control signal RSTV_H. The longer the effective level of the reset control signal RSTV_H, the faster the Vinit2 voltage charges the parasitic capacitance of the light-emitting diode to the turn-on voltage of the light-emitting diode. Therefore, in this embodiment, in the target frame, by adjusting the width of the effective level interval of the reset control signal RSTV_H, that is, the effective level duration, the pixel capacitance of sub-pixels of different colors can be compensated and charged, so that the lighting time of sub-pixels of different colors is roughly the same.

[0110] In some embodiments, for the display panel 10 provided in the present embodiment, since the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel are electrically connected to different initialization signal lines 102, and the capacitance values ​​of the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel are not equal, the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel emit different colors of light, that is, for sub-pixels of different colors, the initialization signal lines 102 electrically connected to the light-emitting elements in the pixel circuit 101 are separated, and the power supply module in the display driving circuit provides initialization voltages of different voltage values ​​to different initialization signal lines 102 in the target frame to compensate for the pixel capacitors of sub-pixels of different colors. In this way, the lighting time of sub-pixels of different colors is roughly the same, which can reduce the difference in the lighting time of sub-pixels of different colors and improve the color cast abnormality of the display screen when the screen is turned on.

[0111] Optionally, step S1 may include:

[0112] Sub-step A1, obtaining a compensation data voltage according to display data, and sending corresponding compensation data voltages to data signal lines of sub-pixels of different colors in the display panel 10 in the target frame, so that the pixel circuit 101 of the sub-pixel performs compensatory charging on the pixel capacitor according to the compensation data voltage; wherein the voltage value of the compensation data voltage is negatively correlated with the turn-on voltage of the light-emitting element corresponding to the pixel capacitor.

[0113] In some embodiments, the display data may be data and control instructions sent by the front end of the display driving circuit. For example, the display data may include brightness band and picture grayscale information and display control instructions. The display control instructions include screen on instructions, such as 0x29 (Display on) instructions. Figure 6As shown, after receiving the screen-on instruction, the display driving circuit starts the compensation scheme (compensation IP), and can determine the first frame of the display frame, or the data voltage of the first few display frames starting from the first frame, according to the brightness Band and the grayscale information of the display data, and call the compensation look-up table (LUT) according to the data voltage of the display frame to look up the table, and obtain the compensation value corresponding to the data voltage of the display frame as the voltage value of the compensation data voltage. In addition, the display driving circuit also normally obtains the data voltage of other display frames according to the brightness Band and the grayscale information of the display data.

[0114] In the target frame (the first frame of the display frame, and / or the compensation frame before the display frame), the compensation data voltage of the corresponding voltage value is sent to the data signal line of the sub-pixel of different colors, so that the pixel circuit 101 of each sub-pixel performs compensation charging on the pixel capacitor according to the corresponding compensation data voltage, and charges the pixel capacitor of the sub-pixel of different colors to the turn-on voltage of the light-emitting element. Figure 6 As shown, in the first display frame after the target frame, a normal data voltage is sent to the data signal line corresponding to each sub-pixel, driving the light-emitting element of each sub-pixel to emit light at the same or similar time, such as emitting light within the same display frame, so that the lighting time of sub-pixels of different colors is roughly the same.

[0115] In some embodiments, the light-emitting element is a light-emitting diode such as an OLED, and the OLED is a current-driven type. The smaller the data (Source) voltage provided by the source driving circuit to the pixel circuit 101, the larger the current flowing through the OLED, and the larger the current, the faster the parasitic capacitance of the OLED is charged to the turn-on voltage of the light-emitting element. Therefore, in this embodiment, the larger the turn-on voltage of the light-emitting element, the larger the driving current required, and the smaller the voltage value of the corresponding compensation data voltage, that is, the voltage value of the compensation data voltage is negatively correlated with the turn-on voltage of the light-emitting element. For example, in the R / G / B pixel unit, the magnitude relationship of the turn-on voltage of the light-emitting element is B<R<G, then the voltage value of the compensation data voltage corresponding to the B pixel is the largest, followed by the R pixel, and the G pixel is the smallest.

[0116] Figure 7 is a waveform diagram of a display driving method provided by an embodiment of the present application. Figure 7As shown, 2 black frames + 1 compensation frame are set before the display frame, and the target frame is a compensation frame before the display frame. In the compensation frame, the display driving circuit sends the corresponding compensation data voltages to the data signal lines of different color sub-pixels. The voltage value of the compensation data voltage is negatively correlated with the turn-on voltage of the corresponding light-emitting element. The larger the turn-on voltage of the light-emitting element, the smaller the corresponding compensation data voltage, so that the pixel capacitors of different color sub-pixels are roughly full in the compensation frame. In this way, when the first frame of the display frame arrives, the light-emitting elements of different color sub-pixels can emit light at the same time in the first frame, ensuring that the light-on time of different color sub-pixels is roughly the same, and the display panel 10 can display the picture faster after the host SOC sends the screen light-up instruction.

[0117] In some embodiments, the compensation LUT can be debugged in advance according to the characteristics of the display device, and different compensation values ​​can be debugged for the compensation LUT for specific compensation frame images and different display frame images to avoid the display panel 10 from suddenly brightening and improve the display quality of the display panel 10. Specifically, the compensation LUT includes the compensation values ​​corresponding to the brightness Band and the grayscale information of the compensation frame image. After receiving the screen brightening instruction, the display driving circuit directly looks up the compensation LUT to obtain the compensation values ​​corresponding to the preset brightness Band and the grayscale information of the image as the compensation data voltage, and then sends the compensation data voltage to the display panel 10 in the compensation frame.

[0118] Alternatively, corresponding compensation values ​​can be set in advance for a variety of different display frame images in the compensation LUT. After receiving the screen-on instruction, the display driving circuit looks up the compensation LUT according to the brightness Band and picture grayscale information of the first pin of the display frame in the display data, obtains the compensation value corresponding to the brightness Band and picture grayscale information closest to the first frame image, and uses it as the compensation data voltage, and then sends the compensation data voltage to the display panel 10 in the first frame. This is only an example, and the embodiment of the present application is not limited to this.

[0119] In the embodiment of the present application, the voltage value of the compensation data voltage is negatively correlated with the turn-on voltage of the corresponding light-emitting element. Therefore, compensation data voltages with different voltage values ​​can be provided in a targeted manner according to the turn-on voltages of the light-emitting elements of sub-pixels of different colors, so that the pixel capacitors of sub-pixels of different colors are all charged to the turn-on voltages of the light-emitting elements within the target frame. In this way, the light-emitting elements of sub-pixels of different colors can be lit up at roughly the same time, thereby improving the color cast abnormality of the displayed image when the computer is turned on and the screen is turned on.

[0120] Optionally, step S1 may include:

[0121] Sub-step A2, obtaining the effective level interval of the first reset control signal according to the display data, and sending the first reset control signals corresponding to the first reset signal lines of the different color sub-pixels in the display panel 10 in the target frame, so that the pixel circuit 101 of the sub-pixel turns on the first initialization terminal of the pixel circuit 101 and the light-emitting element within the effective level interval of the first reset control signal, and compensates and charges the pixel capacitor according to the first initialization voltage input from the first initialization terminal; wherein the width of the effective level interval is positively correlated with the turn-on voltage of the light-emitting element corresponding to the pixel capacitor.

[0122] In some embodiments, such as Figure 7 As shown, after receiving the screen-on instruction, the display driving circuit starts the compensation IP, and can determine the width of the effective level interval of the first frame of the display frame, or the first few display frames before the first frame, according to the brightness Band and the grayscale information of the screen in the display data, and then call the compensation LUT to look up the table according to the width of the effective level interval, and obtain the compensation value corresponding to the width of the effective level interval of the display frame as the width of the effective level interval of the first reset control signal in the target frame. In addition, the display driving circuit also normally obtains the width of the effective level interval of the first reset control signal in other display frames according to the brightness Band and the grayscale information of the screen in the display data.

[0123] In the target frame, the first reset control signals corresponding to the first reset signal lines of the different color sub-pixels in the display panel 10 are sent respectively, wherein the widths of the effective level intervals corresponding to the first reset control signals of the different color sub-pixels are different, and the widths of the effective level intervals are positively correlated with the turn-on voltages of the light-emitting elements of the corresponding sub-pixels. The larger the turn-on voltages of the light-emitting elements, the wider the effective level intervals of the corresponding first reset control signals.

[0124] For example, each pixel unit on the display panel 10 includes R / G / B pixels, wherein the turn-on voltage Vop of the light emitting diode of the G pixel is the largest, while the turn-on voltage Vop of the light emitting diode of the R / B pixel is relatively small. Since the width of the effective level interval of the first reset control signal RSTV_H is positively correlated with the turn-on voltage of the light emitting diode, the width of the effective level interval of the RSTV_H signal corresponding to the G pixel is the largest, while that of the R / B pixel is relatively small.

[0125] Taking the display panel lighting up the screen at 2nit Band and 255 grayscale as an example, the width of the RSTV_H signal valid level interval corresponding to the R / B pixels is 4H, and the width of the RSTV_H signal valid level interval corresponding to the G pixels is 8H. When the screen is lit up at 2nitBand and 255 grayscale, the width of the RSTV_H signal valid level interval corresponding to the R / B pixels is 8H, and the width of the RSTV_H signal valid level interval corresponding to the G pixels is 16H. Among them, 1H usually represents the horizontal scanning cycle, that is, the total time required to complete a row of pixel scans. This is just an example, and the specific width can be adjusted according to the application requirements to meet the positive correlation between the width of the valid level interval and the turn-on voltage of the light-emitting element. The embodiments of the present application do not limit this.

[0126] In this way, the pixel circuit 101 is turned on the first initialization terminal of the pixel circuit 101 and the light-emitting element within the effective level interval of the first reset control signal, and the first initialization voltage input from the first initialization terminal is transmitted to the first node and the light-emitting element, and then based on the first node, the pixel capacitor corresponding to the light-emitting element is charged to the turn-on voltage of the light-emitting element according to the first initialization voltage, for example, according to the Vinit2 voltage. Figure 2 The parasitic capacitance Coled of the OLED is shown to be charged to the turn-on voltage Vop of the OLED.

[0127] The target frame may be the first frame of the display frame and / or a compensation frame before the display frame, and in the initialization stage of the target frame, the first reset control signals corresponding to the first reset signal lines of the sub-pixels of different colors in the display panel 10 may be sent. In this way, in the light-emitting stage of the target frame, the driving transistor in the pixel circuit 101 can drive the light-emitting element to emit light, and since the pixel capacitors of the sub-pixels of different colors are all charged to the turn-on voltage of the light-emitting element in the initialization stage, the light-emitting elements of the sub-pixels of different colors can all emit light in the light-emitting stage, that is, the light-emitting moments of the sub-pixels of different colors are substantially the same.

[0128] like Figure 7 As shown, in each display frame after the target frame, the effective level interval of the first reset control signal is restored to the normal width in the display data, for example, the widths of the effective level intervals of the first reset control signal corresponding to sub-pixels of different colors are substantially equal.

[0129] Figure 8 1 is one of the timing diagrams of a display driving method provided in an embodiment of the present application. Figure 2 Taking the pixel circuit 101 as an example, Figure 8 FIG. 1 shows the timing of the ESTV signal, the NSTV signal, the RSTV_P signal, the GSTV signal, and the first reset control signal RSTV_H signal in this embodiment. Figure 8As shown, increasing the width of the low-level interval of the RSTV-H signal will make the light-emitting element light up faster. The wider the width of the low-level interval, the earlier the light-emitting element lights up.

[0130] For example, the G pixel lights up the latest, so the width of the effective level interval of the RSTV-H signal corresponding to the G pixel can be increased, so that the light-emitting element of the G pixel lights up faster, and finally the lighting time of the R / G / B pixels is kept consistent. Figure 8 As shown, the high level of the RSTV-H signal is equal to the VGH voltage, which may be 8.3V, and the low level of the RSTV-H signal is equal to the VGL voltage, which may be -9V.

[0131] It should be noted that even if the width of the effective level interval of the first reset control signal is increased, the adjusted effective level interval should be within the effective level interval of the light emitting control signal, such as the ESTV signal. Figure 8 As shown in FIG. 1 , the widened low level interval of the RSTV-H signal is still within the high level interval of the ESTV signal. In this way, the pixel circuit completes the compensation charging of the pixel capacitor before the light-emitting stage, so that when the light-emitting stage arrives, the light-emitting elements of the sub-pixels of different colors can emit light, so that the light-emitting moments of the sub-pixels of different colors are roughly the same.

[0132] In this embodiment, the wider the width of the effective level interval of the first reset control signal, the faster the pixel capacitance of the corresponding sub-pixel is charged to the turn-on voltage of the light-emitting element, and the faster the corresponding light-emitting element lights up, that is, the width of the effective level interval is positively correlated with the turn-on voltage of the light-emitting element. Therefore, the width of the effective level interval of the first reset control signal corresponding to the sub-pixel with the largest turn-on voltage of the light-emitting element can be increased, and the light-up speed of the light-emitting element of the sub-pixel with the largest turn-on voltage can be accelerated to be roughly the same as the light-up time of sub-pixels of other colors. Alternatively, the width of the effective level interval of the first reset control signal corresponding to sub-pixels of different colors can be adjusted at the same time, and the width of the effective level interval corresponding to the sub-pixel with the largest turn-on voltage of the light-emitting element in each sub-pixel is set to the widest, and the width of the effective level interval of the sub-pixel with the largest turn-on voltage of the light-emitting element in other colors can be reduced accordingly according to the turn-on voltage of the light-emitting element.

[0133] In some embodiments, there are sub-pixels of different colors in a row of the pixel array, such as three colors of R / G / B, and the pixel circuits 101 of the sub-pixels in the same pixel row are usually electrically connected to the same RSTV_H signal line, so changing the width of the effective level interval of the RSTV_H signal will affect sub-pixels of different colors at the same time. In this embodiment, a compromise value of the effective level interval width can be adjusted for sub-pixels of different colors, so that the lighting moments of sub-pixels of different colors can be roughly equal, for example, the lighting moments of R / G / B pixels remain consistent when the display panel 10 is powered on at a low brightness screen.

[0134] Specifically, taking the case where the turn-on voltage of the light-emitting element in the G pixel is the largest as an example, the turn-on voltage of the light-emitting element in the R / B pixel is smaller than that of the G pixel, and the lighting time of the R / B pixel is roughly the same. The compromise value can be determined according to the time difference between the lighting time of the R / B pixel and the G pixel in actual situations. The smaller the time difference, the better the effect. For example, the width of the effective level interval of an RSTV_H signal can be adjusted first, so that the R / B pixel lights up in 1 frame time, and the width of the effective level interval of the RSTV_H signal at this time is recorded as m, and then a width n is adjusted so that the G pixel lights up in 1 frame, and finally the width of the effective level interval of the RSTV_H signal is determined as (m+n) / 2, so as to take into account the time difference between the lighting time of the R / G / B pixels, so that the lighting time of the R / G / B pixels is roughly the same.

[0135] In some embodiments, the compensation LUT corresponding to the effective level interval can be obtained by debugging for a specific compensation frame image and different display frame images with reference to the relevant description of the compensation LUT corresponding to the compensation data voltage in the aforementioned embodiment. The compensation LUT corresponding to the effective level interval records the width of the effective level interval of the first reset control signal. When the display driving circuit receives the screen-on instruction, it looks up the compensation LUT, and modifies the width of the effective level interval of the first reset control signal in the target frame according to the compensation value corresponding to the width of the effective level interval obtained, so that the width of the effective level interval of the first reset control signal corresponding to different color sub-pixels is positively correlated with the turn-on voltage of the light-emitting element, and the larger the turn-on voltage of the light-emitting element, the wider the width of the corresponding effective level interval.

[0136] In the embodiment of the present application, the width of the effective level interval is positively correlated with the turn-on voltage of the light-emitting element. Therefore, the first reset control signal with different widths of the effective level interval can be set in a targeted manner according to the turn-on voltage of the light-emitting elements of sub-pixels of different colors, so that the pixel capacitors of sub-pixels of different colors are all charged to the turn-on voltage of the light-emitting elements within the target frame. In this way, the light-emitting elements of sub-pixels of different colors can be lit up at roughly the same time, thereby improving the color cast abnormality of the displayed image when the computer is turned on and the screen is turned on.

[0137] Optionally, step S1 may include:

[0138] Sub-step A3, obtaining the initialization voltage according to the display data, and sending the corresponding initialization voltages to the initialization signal lines 102 of the first sub-pixel and the second sub-pixel in the display panel 10 in the target frame, so that the pixel circuit 101 of the sub-pixel performs compensation charging on the pixel capacitor according to the initialization voltage; wherein the voltage value of the initialization voltage is positively correlated with the turn-on voltage of the light-emitting element corresponding to the pixel capacitor.

[0139] In some embodiments, the display driving method is used to drive the display panel 10 provided in the present embodiment. For sub-pixels of different colors, the initialization signal line 102 electrically connected to the light-emitting element in the pixel circuit 101 is separated, and the power module in the display driving circuit provides initialization voltages of different voltage values ​​to different initialization signal lines 102 in the target frame, so that the pixel capacitors of sub-pixels of different colors are all charged to the turn-on voltage of the light-emitting element in the target frame, so that the lighting time of sub-pixels of different colors is roughly the same.

[0140] In some embodiments, the first voltage signal lines 1021 corresponding to the first initialization voltages of sub-pixels of different colors may be separated, that is, the first sub-pixel and the second sub-pixel are electrically connected to different first voltage signal lines 1021. The first voltage signal line 1021 is the initialization signal line 102. In the initialization phase of the target frame, the display driving circuit sends the first initialization voltages corresponding to each other, such as the Vinit2 voltage, to the first voltage signal lines 1021 of the first sub-pixel and the second sub-pixel, so that the pixel circuits 101 of the first sub-pixel and the second sub-pixel charge the pixel capacitor to the turn-on voltage of the light-emitting element according to the first initialization voltage during the initialization phase, and the light-emitting elements of the first sub-pixel and the second sub-pixel light up at substantially the same time during the light-emitting phase.

[0141] Specifically, Fig. 9 As shown, after receiving the screen-on instruction, the display driving circuit starts the compensation IP, and can determine the first frame of the display frame, or the first initialization voltage of the display frames before the first frame, that is, the Vinit2 voltage, according to the brightness Band and the grayscale information of the screen in the display data, and call the compensation LUT to look up the table according to the Vinit2 voltage of the display frame to obtain the compensation value corresponding to the Vinit2 voltage of the display frame. In addition, the display driving circuit also normally obtains the Vinit2 voltage of other display frames according to the brightness Band and the grayscale information of the screen in the display data.

[0142] In the target frame (the first frame of the display frame, and / or the compensation frame before the display frame), the first voltage signal line 1021 of the first sub-pixel and the second sub-pixel sends a first initialization voltage of a corresponding voltage value, so that the pixel circuit 101 of each sub-pixel charges the pixel capacitor to approximately the turn-on voltage of the light-emitting element according to the first initialization voltage corresponding to each sub-pixel. Fig. 9 As shown, in the first display frame after the target frame, a normal first initialization voltage, such as a negative voltage Vinit2 voltage, is sent to the first voltage signal line 1021 corresponding to each sub-pixel to reset the first node in the pixel circuit 101 and the light-emitting element electrically connected to the first node. If the target frame is the first frame of the display frame, the Vinit2 voltage is also a negative voltage in the black insertion frame before the display frame.

[0143] In this embodiment, the larger the voltage value of the first initialization voltage is, the faster the pixel capacitor of the corresponding sub-pixel is charged to the turn-on voltage of the light-emitting element, and the faster the corresponding light-emitting element lights up, that is, the voltage value of the first initialization voltage is positively correlated with the turn-on voltage of the light-emitting element. For example, in an R / G / B pixel unit, the turn-on voltage of the light-emitting element is B<R<G, then the voltage value of the first initialization voltage corresponding to the G pixel is the largest, followed by the R pixel, and the B pixel is the smallest.

[0144] Fig.10 FIG. 2 is a timing diagram of a display driving method provided in an embodiment of the present application. Fig.10 As shown, a black frame is set before the display frame, the target frame is the first display frame, and the first initialization voltage in the black frame and other display frames except the target frame is a negative voltage, that is, the Vinit2 voltage is -1V. Fig.10 As shown, in the first frame of the display frame, the Vinit2 voltage of the R / G / B pixels is set to a high voltage and is all positive. For example, the Vinit2 voltage of the G pixel is 0.7V, the Vinit2 voltage of the R pixel is 0.2V, and the Vinit2 voltage of the B pixel is 0.1V.

[0145] In some embodiments, the compensation LUT corresponding to the first initialization voltage can be obtained by debugging for a specific compensation frame image and different display frame images with reference to the relevant description of the compensation LUT corresponding to the compensation data voltage in the aforementioned embodiments. The compensation LUT corresponding to the first initialization voltage records the compensation value corresponding to the first initialization voltage in the target frame. When the display driving circuit receives the screen light-up instruction, it looks up the compensation LUT, and modifies the voltage value of the first initialization voltage in the target frame according to the compensation value corresponding to the first initialization voltage obtained, so that the voltage value of the first initialization voltage corresponding to the first sub-pixel and the second sub-pixel is positively correlated with the turn-on voltage of the light-emitting element, and the larger the turn-on voltage of the light-emitting element, the larger the corresponding first initialization voltage.

[0146] In some embodiments, the pixel circuit 101 includes a first reset module 1011 and a second reset module 1012, and both are electrically connected to the first node, and the first node is electrically connected to the light-emitting element. The second voltage signal lines 1022 of sub-pixels of different colors can be separated, that is, the first sub-pixel and the second sub-pixel are each electrically connected to a different second voltage signal line 1022. Among them, the second voltage signal line 1022 is an initialization signal line 102. In the initialization stage of the target frame, the display driving circuit sends the second initialization voltage corresponding to each other, such as the Vinit4 voltage, to the second voltage signal line 1022 of the first sub-pixel and the second sub-pixel, so that the pixel circuit 101 of the first sub-pixel and the second sub-pixel charges the pixel capacitor to the turn-on voltage of the light-emitting element during the initialization stage according to the second initialization voltage, and then the light-emitting elements of the first sub-pixel and the second sub-pixel light up at approximately the same time during the light-emitting stage.

[0147] In some embodiments, after receiving the screen light instruction, the display driving circuit starts the compensation IP, calls the compensation LUT table, and obtains the compensation value corresponding to the second initialization voltage, such as the Vinit4 voltage. Then, in the target frame (the first frame of the display frame, and / or the compensation frame before the display frame), the second initialization voltage is sent to the second voltage signal line 1022 of the first sub-pixel and the second sub-pixel, so that the pixel circuit 101 of each sub-pixel charges the pixel capacitor to the turn-on voltage of the light-emitting element according to the second initialization voltage corresponding to each sub-pixel. Among them, the first voltage signal line 1021 electrically connected to the light-emitting element in the pixel circuit 101 receives a normal first initialization voltage, such as a negative voltage Vinit2 voltage, and the first initialization voltage can reset the first node and the light-emitting element under the control of the first reset control signal sent by the first reset signal line electrically connected to the pixel circuit 101.

[0148] In this embodiment, the larger the voltage value of the second initialization voltage is, the faster the pixel capacitor of the corresponding sub-pixel is charged to the turn-on voltage of the light-emitting element, and the faster the corresponding light-emitting element lights up, that is, the voltage value of the second initialization voltage is positively correlated with the turn-on voltage of the light-emitting element. For example, in an R / G / B pixel unit, the turn-on voltage of the light-emitting element is B<R<G, then the voltage value of the second initialization voltage corresponding to the G pixel is the largest, followed by the R pixel, and the B pixel is the smallest.

[0149] In an embodiment of the present application, the voltage value of the initialization voltage is positively correlated with the turn-on voltage of the light-emitting element. Therefore, the voltage value of the initialization voltage can be set specifically according to the turn-on voltage of the light-emitting elements in sub-pixels of different colors, such as the first sub-pixel and the second sub-pixel, so that the pixel capacitors of the first sub-pixel and the second sub-pixel are charged to the turn-on voltage of the light-emitting element within the target frame. In this way, the light-emitting elements of the first sub-pixel and the second sub-pixel can be lit up at roughly the same time, thereby improving the color cast abnormality of the displayed image when the screen is turned on.

[0150] Optionally, step S1 may include:

[0151] Sub-step A4, at least in the target frame, sends a second reset control signal to the second reset signal line of the display panel 10, so that the second reset module 1012 of the pixel circuit 101 responds to the second reset control signal input by the second reset control terminal, and turns on the second initialization terminal and the first node of the pixel circuit 101.

[0152] In some embodiments, at least in the target frame, the pixel circuit 101 is controlled to charge the pixel capacitor to the turn-on voltage of the light-emitting element according to the second initialization voltage, and then the second reset module 1012 is controlled to conduct the second initialization terminal and the first node at least in the target frame, so as to charge the pixel capacitor of the light-emitting element to the turn-on voltage of the light-emitting element based on the first node. The target frame includes the first frame of the display frame, and / or one or more compensation frames before the display frame.

[0153] Specifically, the display driving circuit sends a second reset control signal, such as an RSTV_C signal, to the second reset signal line of the display panel 10 at least in the target frame. The second reset control signal is input into the second reset module 1012 through the second reset control terminal of the pixel circuit 101, so that the second reset module 1012 turns on the second initialization terminal and the first node of the pixel circuit 101 under the control of the second reset control signal, thereby transmitting the second initialization voltage to the first node, and the pixel capacitance of the light-emitting element can be charged to the turn-on voltage of the light-emitting element based on the first node.

[0154] Fig.11 FIG. 3 is a timing diagram of a display driving method provided in an embodiment of the present application. Figure 3 Taking the pixel circuit 101 as an example, Fig.11 1 shows the timing of the ESTV signal, the NSTV signal, the RSTV_P signal, the GSTV signal, the RSTV_H signal, and the second reset control signal RSTV_C signal in this embodiment. Figure 3 As shown, by sending the RSTV_C signal to the pixel circuit 101, the first transistor T9 can be controlled to turn on, and the second initialization voltage (Vinit4 voltage) input by the second voltage signal line 1022 (Vinit4 signal line) can be transmitted to the first node (N4), and then the parasitic capacitance Coled of the OLED can be charged based on the node N4 to the turn-on voltage Vop of the OLED.

[0155] In some embodiments, the width of the effective level interval of the second reset control signal RSTV_C may be equal to the width of the effective level interval of the first reset control signal RSTV_H. Fig.11As shown in the figure, the effective level intervals of RSTV_C signal and RSTV_H signal are both low level intervals, the interval widths of the two are the same, and the voltage values ​​of the low levels can also be equal. For example, the low level interval widths of RSTV-H signal and RSTV_C signal are both 4H, the low level is equal to the VGL voltage, and the high level is equal to the VGH voltage. Fig.11 As shown, the low level interval of the RSTV_C signal is delayed by 1H than the low level interval of the RSTV_H signal, and the low level interval of the RSTV_C signal is also within the high level interval of the ESTV signal.

[0156] In some embodiments, reference Figure 8 As shown in the figure, by increasing the width of the low level interval of the RSTV-H signal, the light-emitting element lights up faster. In this embodiment, the light-emitting element can also light up faster by adjusting the width of the effective level interval of the second reset control signal, that is, the RSTV_C signal, corresponding to the sub-pixels of different colors. Wherein, similar to the logic of adjusting the width of the effective level interval of the first reset control signal RSTV_H, the width of the effective level interval of the second reset control signal RSTV_C is positively correlated with the turn-on voltage of the light-emitting element. The larger the turn-on voltage of the light-emitting element, the wider the effective level interval of the corresponding second reset control signal RSTV_C, so that the pixel capacitors of the sub-pixels of different colors are charged to the turn-on voltage of the light-emitting element during the initialization stage, so that when the light-emitting stage arrives, the light-emitting moments of the light-emitting elements in the sub-pixels of different colors are roughly the same.

[0157] For example, the G pixel lights up the latest. Fig.11 As shown, the width of the low level interval of the RSTV_C signal corresponding to the G pixel can be increased, so that the light-emitting element of the G pixel will light up faster, and finally the lighting time of the R / G / B pixels will remain consistent. Taking the display panel lighting up the screen at 2nitBand and 255 grayscale as an example, the width of the RSTV_C signal effective level interval corresponding to the R / B pixel is 4H, and the width of the RSTV_C signal effective level interval corresponding to the G pixel is 8H. This is just an example, and the embodiments of the present application are not limited to this.

[0158] In the embodiment of the present application, at least in the target frame, the second reset control signal is used to control the second reset module 1012 in the pixel circuit 101 to turn on the second initialization terminal and the first node, thereby transmitting the second initialization voltage input from the second initialization terminal to the first node. In this way, the pixel capacitor of the light-emitting element can be charged to the turn-on voltage of the light-emitting element based on the first node within the target frame, so that the light-emitting elements of the first sub-pixel and the second sub-pixel are lit up at roughly the same time, thereby improving the color cast abnormality of the displayed image when the screen is turned on.

[0159] Optionally, sub-step A4 may include:

[0160] In each display frame, a second reset control signal is sent to the second reset signal line of the display panel 10, so that the second reset module 1012 conducts the second initialization terminal and the first node in response to the second reset control signal;

[0161] Sending respective corresponding initialization voltages to the initialization signal lines 102 of the first sub-pixel and the second sub-pixel in the display panel 10 in the target frame includes:

[0162] In each display frame, the second initialization voltages corresponding to the first and second sub-pixels in the display panel 10 are sent to the second voltage signal lines 1022 so that the pixel circuits 101 of the sub-pixels perform compensation charging on the pixel capacitors according to the second initialization voltages.

[0163] In some embodiments, the color coordinates of pixels under low temperature conditions will drift with temperature, that is, there will be a temperature drift phenomenon, and the degree of displacement of sub-pixels of different colors is different. For example, at low temperatures, the current of G pixels becomes larger under the same data voltage, and the brightness will increase, while the relative increase of R / B pixels is very small, resulting in a green display. In this embodiment, a second reset module 1012 is added to the pixel circuit 101, so the temperature drift can be improved by adjusting the second initialization voltage, such as the Vinit4 voltage.

[0164] Specifically, if the target frame is a compensation frame before the display frame, the second reset control signal and the second initialization voltage corresponding to each sub-pixel are sent to the display panel 10 in the target frame and each display frame after the target frame. If the target frame is the first frame of the display frame, the second reset control signal and the second initialization voltage corresponding to each sub-pixel are sent to the display panel 10 in each display frame (including the target frame).

[0165] Fig.12 FIG. 4 is a timing diagram of a display driving method provided in an embodiment of the present application. Fig.12 As shown, a black frame is inserted before the display frame, and the target frame is the display frame No. 1. In each display frame including the first frame, the display driving circuit sends a second reset control signal, namely, RSTV_C signal, to the second reset signal line, and sends a second initialization voltage (Vinit4 voltage) corresponding to each of the second voltage signal lines 1022 corresponding to the R / G / B pixels.

[0166] like Fig.12As shown, in each display frame, the Vinit4 voltage of the R / G / B pixels is set to a high voltage and is positive. For example, the Vinit4 voltage of the G pixel is 0.7V, the Vinit4 voltage of the R pixel is 0.2V, and the Vinit4 voltage of the B pixel is 0.1V. In addition, for example, the first initialization voltage is a negative voltage, that is, the Vinit2 voltage is -1V. In practical applications, in order to improve temperature drift, the Vinit4 voltage of the R / B pixel can be increased at low temperatures, which can increase the brightness of the R / B pixel, so that the display screen will not be green, and the overall brightness of the display panel 10 is increased. The brightness adjustment can be solved by re-adjusting the Gamma curve.

[0167] Optionally, sub-step A4 may include:

[0168] When the first reset control signal and the second reset control signal are sent in the same frame, after the first reset control signal is sent to the first reset signal line of the display panel 10 , the second reset control signal is sent to the second reset signal line after a first delay.

[0169] In some embodiments, in each display frame, a first reset control signal may be sent to the first reset signal line of the display panel 10, so that the first reset module 1011 of the pixel circuit 101 responds to the first reset control signal and turns on the first initialization terminal and the first node. In addition, in each display frame, a first initialization voltage with the same voltage value is sent to the first voltage signal line 1021 of the first sub-pixel and the second sub-pixel in the display panel 10, so that the first initialization voltage is transmitted to the first node and the light-emitting element electrically connected to the first node, so as to reset the first node and the light-emitting element. For example, Figure 3 As shown, the positive charge of the anode of the light emitting diode in the R / G / B pixel is eliminated by the negative voltage Vinit2, so as to reset the node N4 and the light emitting diode.

[0170] In this embodiment, Fig.12 As shown, when the display driving circuit sends the first reset control signal and the second reset control signal to the display panel 10 in the same frame, the first reset control signal is first sent to the first reset signal line to control the first reset module 1011 to conduct the first initialization terminal and the first node, such as Figure 3 Then, after delaying the first time length, a second reset control signal is sent to the second reset signal line to control the second reset module 1012 to conduct the second initialization terminal and the first node, as shown. Figure 3 The first time duration needs to ensure that the first initialization voltage completes the reset of the first node and the light emitting element. The value of the first time duration can be determined according to actual application requirements, for example, Fig.12As shown, the first duration is the time difference between the low level intervals of the first reset control signal RSTV_H and the second reset control signal, and the first duration is greater than zero, for example, the first duration is 1H.

[0171] In this way, the node N4 and the light-emitting diode can be reset by the Vinit2 voltage first to improve abnormal phenomena such as afterimage and ghosting of the display panel 10. Then, the parasitic capacitance of the light-emitting diode can be compensated and charged by the Vinit4 voltage to improve the color deviation abnormality when the low-brightness screen is powered on, thereby improving the display image quality of the display panel 10.

[0172] Optionally, the display driving method further includes:

[0173] Step S2, in the display frame, sending a light control signal to the light control signal line of the display panel; wherein the effective level interval of the first reset control signal and / or the effective level interval of the second reset control signal are within the target level interval, and the target level interval is the effective level interval corresponding to the light control signal.

[0174] In some embodiments, the light emitting control signal line of the display panel 10 may be as follows: Figure 2 or Figure 3 In the pixel circuit shown in FIG. 1 , the ESTV terminal is electrically connected to the ESTV signal line, and the light-emitting control signal is the ESTV signal sent by the display driving circuit to the ESTV signal line. Alternatively, the light-emitting control signal line may be as follows: Fig.10 or Fig.12 The EM signal line corresponds to the EM signal in the timing diagram, and the emission control signal is the EM signal. Among them, the EM signal (Emission Signal) is an emission control signal used to control the emission state of the pixel. The ESTV signal is usually the start signal of the EM signal, which is used to indicate the start time of the EM signal in a frame. This is only an example, and the embodiments of the present application are not limited to this.

[0175] It should be noted that even if the first time period is delayed, the second reset control signal RSTV-C should be within the effective level range of the light emitting control signal, such as the ESTV signal. Fig.11 and Fig.12 As shown in FIG. 1 , the low level interval of the RSTV-C signal after a delay of 1H is still within the high level interval of the ESTV signal. The pixel circuit can complete the compensation charging of the pixel capacitor before the light-emitting stage, so that when the light-emitting stage arrives, the light-emitting elements of sub-pixels of different colors can emit light, so that the light-emitting moments of sub-pixels of different colors are roughly the same.

[0176] In some embodiments, the compensation LUT corresponding to the second initialization voltage can be obtained by debugging for a specific compensation frame image and different display frame images with reference to the relevant description of the compensation LUT corresponding to the compensation data voltage in the aforementioned embodiments. The compensation LUT corresponding to the second initialization voltage records the compensation value corresponding to the second initialization voltage in the target frame. When the display driving circuit receives the screen light instruction, it looks up the compensation LUT, and modifies the voltage value of the second initialization voltage in the target frame according to the compensation value corresponding to the obtained second initialization voltage, so that the voltage value of the second initialization voltage corresponding to the first sub-pixel and the second sub-pixel is positively correlated with the turn-on voltage of the light-emitting element, and the larger the turn-on voltage of the light-emitting element, the larger the corresponding second initialization voltage.

[0177] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0178] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0179] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0180] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprises a..." do not exclude the existence of other identical elements in the process, method, article or terminal device that includes the elements.

[0181] The above is a detailed introduction to a display panel, a display module, a display device and a display driving method provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A display panel, characterized in that: The display panel comprises: A plurality of sub-pixels, wherein the pixel circuit of the sub-pixel comprises a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the plurality of sub-pixels comprises at least a first sub-pixel and a second sub-pixel; the pixel capacitor of the first sub-pixel and the pixel capacitor of the second sub-pixel have different capacitance values, and the light-emitting element of the first sub-pixel and the light-emitting element of the second sub-pixel emit light of different colors; A plurality of initialization signal lines are provided, and the light emitting element of the first sub-pixel and the light emitting element of the second sub-pixel are electrically connected to different initialization signal lines.

2. The display panel according to claim 1, characterized in that: The pixel circuit comprises: a first reset module, the first reset module being electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively, and being configured to transmit a first initialization voltage input from the first initialization terminal to the first node under the control of a first reset control signal input from the first reset control terminal, so as to reset the first node and the light-emitting element electrically connected to the first node, or to compensate and charge the pixel capacitance of the light-emitting element based on the first node; The first initialization end of the first sub-pixel and the first initialization end of the second sub-pixel are electrically connected to different first voltage signal lines; and the initialization signal lines include the first voltage signal lines.

3. The display panel according to claim 1, characterized in that: The pixel circuit comprises: a first reset module, the first reset module being electrically connected to the first node, the first reset control terminal, and the first initialization terminal respectively, and being configured to transmit a first initialization voltage inputted from the first initialization terminal to the first node under the control of a first reset control signal inputted from the first reset control terminal, so as to reset the first node and the light emitting element electrically connected to the first node; a second reset module, the second reset module being electrically connected to the first node, the second reset control terminal, and the second initialization terminal respectively, and being configured to transmit a second initialization voltage input from the second initialization terminal to the first node under the control of a second reset control signal input from the second reset control terminal, so as to compensate and charge the pixel capacitor based on the first node; The second initialization end of the first sub-pixel and the second initialization end of the second sub-pixel are electrically connected to different second voltage signal lines, and the initialization signal lines include the second voltage signal line.

4. The display panel according to claim 3, characterized in that: The second reset module includes: A first transistor, wherein the control electrode of the first transistor is electrically connected to the second reset signal line of the display panel, and the control electrode of the first transistor serves as the second reset control terminal; the first electrode of the first transistor is electrically connected to the second voltage signal line, and the first electrode of the first transistor serves as the second initialization terminal; the second electrode of the first transistor is electrically connected to the first node.

5. The display panel according to claim 4, characterized in that: The second reset control terminal of the first sub-pixel and the second reset control terminal of the second sub-pixel are electrically connected to the same second reset signal line.

6. A display module, characterized in that: The display module includes a display driving circuit and a display panel as described in any one of claims 1 to 5; the display panel is electrically connected to the display driving circuit.

7. The display module according to claim 6, characterized in that: The display driving circuit includes a power module, which is electrically connected to a plurality of initialization signal lines of the display panel and is configured to provide an initialization voltage to the initialization signal lines corresponding to the first sub-pixel and the second sub-pixel of the display panel.

8. The display module according to claim 7, characterized in that: The power module is electrically connected to a plurality of first voltage signal lines of the display panel; The power supply module is configured to provide first initialization voltages of different voltage values ​​to the first voltage signal lines corresponding to the first sub-pixel and the second sub-pixel, so that the pixel circuits of the first sub-pixel and the second sub-pixel respectively perform compensation charging on the pixel capacitor according to the first initialization voltage. Alternatively, a first initialization voltage having the same voltage value is provided to the plurality of first voltage signal lines, so that the pixel circuit resets the first node and the light emitting element connected to the first node according to the first initialization voltage.

9. The display module according to claim 7, characterized in that: The power module is electrically connected to a plurality of first voltage signal lines of the display panel, and is configured to provide a first initialization voltage with the same voltage value to the plurality of first voltage signal lines, so that the pixel circuit resets the first node and the light-emitting element connected to the first node according to the first initialization voltage; The power supply module is also electrically connected to multiple second voltage signal lines of the display panel, and is configured to provide a second initialization voltage of different voltage values ​​to the second voltage signal lines corresponding to the first sub-pixel and the second sub-pixel, so that the pixel circuits of each of the first sub-pixel and the second sub-pixel compensate and charge the pixel capacitor according to the second initialization voltage.

10. A display device, characterized in that: The display device comprises a display module as described in any one of claims 6-9.

11. A display driving method, characterized in that: The display driving method comprises: In a target frame, a pixel circuit of a sub-pixel in a display panel is controlled to charge a pixel capacitor corresponding to a light-emitting element in the pixel circuit; wherein the target frame includes at least the first frame of a display frame, and / or one or more compensation frames before the display frame.

12. The display driving method according to claim 11, characterized in that: The method of controlling the pixel circuit of the sub-pixel in the display panel in the target frame to charge the pixel capacitor corresponding to the light-emitting element in the pixel circuit comprises: Acquire a compensation data voltage according to display data, and send the corresponding compensation data voltages to the data signal lines of the sub-pixels of different colors in the display panel in the target frame, so that the pixel circuit of the sub-pixel performs compensation charging on the pixel capacitor according to the compensation data voltage; Wherein, the voltage value of the compensation data voltage is negatively correlated with the turn-on voltage of the light-emitting element corresponding to the pixel capacitor.

13. The display driving method according to claim 11, characterized in that: The method of controlling the pixel circuit of the sub-pixel in the display panel in the target frame to charge the pixel capacitor corresponding to the light-emitting element in the pixel circuit comprises: The effective level interval of the first reset control signal is obtained according to the display data, and the first reset control signals corresponding to the first reset signal lines of the different color sub-pixels in the display panel are sent in the target frame, so that the pixel circuit of the sub-pixel turns on the first initialization end of the pixel circuit and the light-emitting element within the effective level interval of the first reset control signal, and the pixel capacitor is compensated and charged according to the first initialization voltage input by the first initialization end; wherein the width of the effective level interval is positively correlated with the turn-on voltage of the light-emitting element corresponding to the pixel capacitor.

14. The display driving method according to claim 11, characterized in that: The method of controlling the pixel circuit of the sub-pixel in the display panel in the target frame to charge the pixel capacitor corresponding to the light-emitting element in the pixel circuit comprises: Acquire an initialization voltage according to display data, and send the initialization voltages corresponding to the initialization signal lines of the first sub-pixel and the second sub-pixel in the display panel in the target frame, so that the pixel circuit of the sub-pixel performs compensation charging on the pixel capacitor according to the initialization voltage; The voltage value of the initialization voltage is positively correlated with the turn-on voltage of the light-emitting element corresponding to the pixel capacitor.

15. The display driving method according to claim 14, characterized in that: The method of controlling the pixel circuit of the sub-pixel in the display panel in the target frame to charge the pixel capacitor corresponding to the light-emitting element in the pixel circuit comprises: At least in the target frame, a second reset control signal is sent to the second reset signal line of the display panel, so that the second reset module of the pixel circuit responds to the second reset control signal input by the second reset control terminal to turn on the second initialization terminal and the first node of the pixel circuit.

16. The display driving method according to claim 15, characterized in that: The sending a second reset control signal to a second reset signal line of the display panel at least in the target frame comprises: In each of the display frames, sending the second reset control signal to the second reset signal line of the display panel, so that the second reset module conducts the second initialization terminal and the first node in response to the second reset control signal; The sending respective corresponding initialization voltages to the initialization signal lines of the first sub-pixel and the second sub-pixel in the display panel in the target frame includes: In each of the display frames, the second initialization voltages corresponding to the first sub-pixel and the second sub-pixel in the display panel are sent to the second voltage signal lines, so that the pixel circuits of the sub-pixels perform compensation charging on the pixel capacitors according to the second initialization voltages.

17. The display driving method according to claim 15, characterized in that: The sending a second reset control signal to a second reset signal line of the display panel at least in the target frame comprises: When the first reset control signal and the second reset control signal are sent in the same frame, after sending the first reset control signal to the first reset signal line of the display panel, the second reset control signal is sent to the second reset signal line after a first delay.

18. The display driving method according to any one of claims 13 to 17, characterized in that: The display driving method further includes: In the display frame, sending a light-emitting control signal to a light-emitting control signal line of the display panel; The effective level interval of the first reset control signal and / or the effective level interval of the second reset control signal is within a target level interval, and the target level interval is the effective level interval corresponding to the light emitting control signal.

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