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

Abstract

This application provides a display panel, display module, display device, and display driving method, relating to the field of display technology. The display panel includes: multiple sub-pixels, each sub-pixel's pixel circuit including a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the multiple sub-pixels include at least a first sub-pixel and a second sub-pixel; the pixel capacitor values ​​of the first sub-pixel and the second sub-pixel are not equal, and the light emitted by the light-emitting elements of the first sub-pixel and the second sub-pixel is of different colors; multiple initialization signal lines, with the light-emitting elements of the first sub-pixel and the second sub-pixel electrically connected to different initialization signal lines. This avoids color distortion in the displayed image and improves the display quality of the display panel.

Description

Technical Field

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

[0002] In some current display devices, the number, arrangement, and area of ​​R / G / B pixels in the pixel unit are different, which results in different pixel capacitances corresponding to the light-emitting elements in the R / G / B pixels. Furthermore, the minimum voltage required for the light-emitting elements of the R / G / B pixels to emit light is also different, leading to different turn-on times for the R / G / B pixels. Pixel capacitance is similar to the parasitic capacitance of a light-emitting diode.

[0003] When the current flowing through the light-emitting element is small, the differences in turn-on time caused by variations in pixel capacitance and the switching voltage of the light-emitting element become more pronounced. Especially when the display device is powered on, the differences in turn-on time between R / G / B pixels can lead to abnormal color distortion in the displayed image. Summary of the Invention

[0004] This application provides a display panel, display module, display device, and display driving method, which can solve the problem of color distortion in the display screen caused by differences in pixel turn-on time.

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

[0006] Multiple sub-pixels, wherein the pixel circuit of each sub-pixel includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the multiple 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 emitted by 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] Multiple initialization signal lines are provided, and the light-emitting elements of the first sub-pixel and the second sub-pixel are electrically connected to different initialization signal lines.

[0008] Optionally, the pixel circuit includes:

[0009] The first reset module is electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively. It is configured to 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, 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 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; the initialization signal lines include the first voltage signal lines.

[0011] Optionally, the pixel circuit includes:

[0012] The first reset module is electrically connected to the first node, the first reset control terminal, and the first initialization terminal, respectively. It is configured to 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, so as to reset the first node and the light-emitting element electrically connected to the first node.

[0013] The second reset module is electrically connected to the first node, the second reset control terminal, and the second initialization terminal, respectively. It 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.

[0014] 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, and the initialization signal lines include the second voltage signal lines.

[0015] Optionally, the second reset module includes:

[0016] The first transistor has its control electrode 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] Secondly, embodiments of this application provide a display module, the display module including 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] Thirdly, embodiments of this application provide a display device, the display device including the display module as described in the second aspect.

[0020] Fourthly, embodiments of this application provide a display driving method, the display driving method comprising:

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

[0022] This application provides a display panel, display module, display device, and display driving method, which have at least the following advantages: The display panel includes multiple sub-pixels and multiple initialization signal lines. The pixel circuit of each sub-pixel includes a light-emitting element and a corresponding pixel capacitor. The multiple sub-pixels include at least a first sub-pixel and a second sub-pixel. Since the light-emitting elements of the first and second sub-pixels emit light of different colors, the first and second sub-pixels are sub-pixels of different colors, and the pixel capacitors of the first and second sub-pixels have different capacitance values. The light-emitting elements of the first and second sub-pixels are electrically connected to different initialization signal lines. Therefore, different initialization voltages can be provided to the first and second sub-pixels through the initialization signal lines. In this way, the pixel capacitors of the first and second sub-pixels can charge to the turn-on voltage of the light-emitting element in the same or similar time, making the turn-on time of the light-emitting elements in the first and second sub-pixels approximately the same. This avoids abnormal color distortion in the displayed image when the screen is turned on, thus improving the display quality of the display panel. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0025] Figure 2 This is one of the schematic diagrams of a pixel circuit provided in the embodiments of this application;

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

[0027] Figure 4 This is a waveform diagram illustrating the relationship between data voltage and screen brightness in related technologies;

[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 logic schematic diagrams of a display driving method provided by an embodiment of the present application;

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

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

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

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

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

[0035] Figure 12 is the fourth timing schematic 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 some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application 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 pixel units 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) required for the light-emitting diodes to emit light 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 femtofarads (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 order is B>G>R.

[0039] Normally, the parasitic capacitance (Coled) and the turn-on voltage (Vop) of an LED have little impact on display quality. However, at low brightness, the driving transistors in the pixel circuit are only slightly active, the current flowing through the LED is extremely small, and the EM control signal has a short on-time. This makes the effects of the parasitic capacitance (Coled) and the turn-on voltage (Vop) more noticeable. Especially in the first frame of the power-on display, the data cable (Data) needs to charge the parasitic capacitance (Coled) before the LED can light up. Different capacitance values ​​and different turn-on voltages (Vop) result in different turn-on times for the R / G / B pixels, which can cause color distortion during power-on. For example, if the G pixel has the highest turn-on voltage (Vop) and the slowest turn-on time, the display may appear reddish or bluish during power-on.

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

[0041] Multiple sub-pixels, the pixel circuit 101 of the sub-pixels includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element; the multiple 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 elements of the first sub-pixel and the light-emitting elements of the second sub-pixel emit light of different colors;

[0042] Multiple initialization signal lines 102 are provided, and the light-emitting elements of the first sub-pixel and 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 pixels arranged in rows and columns. Each pixel includes multiple sub-pixels, and the multiple sub-pixels include sub-pixels of different colors, such as red pixels, green pixels, and blue pixels. Each sub-pixel includes a pixel circuit 101, which includes a light-emitting element and a pixel capacitor corresponding to the light-emitting element. The light-emitting element can be a light-emitting diode, such as an OLED or an active matrix organic light-emitting diode (AMOLED). The pixel capacitor corresponding to the light-emitting element can be the parasitic capacitance of the light-emitting diode. The pixel capacitor is used to drive the light-emitting element to emit light.

[0044] In some embodiments, the plurality of sub-pixels includes at least two sub-pixels of different colors: a first sub-pixel and a second sub-pixel. The light emitted by the light-emitting element of the first sub-pixel is a first color, and the light emitted by the second sub-pixel is a second color. The first color and the second color are different. The first color and the second color can each be one of two different colors from the RGB color space.

[0045] In some embodiments, the pixel capacitance of the first sub-pixel is different from that of the second sub-pixel; that is, their capacitance values ​​are not equal. The size of the pixel capacitance may be related to the area occupied by the sub-pixel within the pixel unit. For example, pixel B occupies the largest area, and therefore has the largest pixel capacitance. Because the pixel capacitance values ​​of the first and second sub-pixels are not equal, the time required for them to fully charge is also different. Therefore, the difference in pixel capacitance may cause differences 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. Normally, the initialization voltage is negative, which can eliminate the positive charge on 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 different color sub-pixels are separated. That is, the light-emitting elements of the first sub-pixel and the light-emitting elements of the second sub-pixel are electrically connected to different initialization signal lines 102. In this way, the light-emitting elements of the first sub-pixel and the light-emitting elements of the second sub-pixel can receive initialization voltages of different values.

[0047] In some embodiments, to ensure consistent lighting times for different color sub-pixels, the pixel capacitors of different color sub-pixels can be charged to a level equal to or slightly lower than the turn-on voltage of the light-emitting element at the same or similar times. Specifically, the pixel capacitor of the sub-pixel that lights up more slowly in the first and second sub-pixels can be compensated for, or the pixel capacitors of the first and second sub-pixels can be compensated for simultaneously, with different voltage magnitudes or durations, so that when the pixel capacitors of the two sub-pixels are finally compensated for, they are simultaneously charged to a level 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. 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 referred to as compensation charging. The initialization voltage for compensation charging can be sent to one of the first sub-pixel and the second sub-pixel, or different initialization voltage values ​​can be sent to the first sub-pixel and the second sub-pixel respectively for compensation charging of the pixel capacitor. This application embodiment does not limit this approach.

[0049] In this embodiment, the display panel 10 includes multiple sub-pixels and multiple initialization signal lines 102. The pixel circuit 101 of each sub-pixel includes a light-emitting element and a corresponding pixel capacitor. The multiple sub-pixels include at least a first sub-pixel and a second sub-pixel. Since the light emitted by the light-emitting elements of the first and second sub-pixels is of different colors, the first and second sub-pixels are sub-pixels of different colors, and the pixel capacitors of the first and second sub-pixels have different capacitance values. The light-emitting elements of the first and second sub-pixels are electrically connected to different initialization signal lines 102. Therefore, different initialization voltages can be provided to the first and second sub-pixels through the initialization signal lines 102. In this way, the pixel capacitors of the first and second sub-pixels can charge to the turn-on voltage of the light-emitting element in the same or similar time, making the turn-on time of the light-emitting elements in the first and second sub-pixels approximately the same. This avoids abnormal color distortion in the displayed image when the screen is turned on, and improves the display quality of the display panel 10.

[0050] Optionally, the pixel circuit 101 includes:

[0051] The first reset module 1011 is electrically connected to the first node, the first reset control terminal and the first initialization terminal respectively. It is configured to transmit the first initialization voltage input to the first initialization terminal to the first node under the control of the first reset control signal input to 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 capacitor of the light-emitting element based on the first node.

[0052] 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; 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 through the first reset module 1011. The first reset modules 1011 of different color sub-pixels are electrically connected to different initialization signal lines 102, so that different initialization voltage values ​​can be input to the pixel circuit 101 of different color sub-pixels through the initialization signal line 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. The pixel circuit 101 also 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 can receive the first initialization voltage transmitted by the first voltage signal line 1021. 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. Under the control of the first reset control signal input at the first reset control terminal, it can transmit the first initialization voltage input at the first initialization terminal to the first node, and then to the light-emitting element. For example, the first node is the intermediate 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 capacitor is the parasitic capacitance of the light-emitting diode, which is equivalent to being connected in parallel with the light-emitting diode. Therefore, 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. This first voltage signal line 1021 is connected to the power module of the display driving circuit of the display panel 10, allowing the terminal to receive initialization voltages for reset and initialization voltages for charging compensation 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. This first voltage signal line 1021 is connected to the power module of the display driving circuit of the display panel 10, ensuring 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 This is one of the structural schematic diagrams of a pixel circuit 101 provided in an embodiment of this application. For example... Figure 2As shown, the light-emitting element in pixel circuit 101 is a light-emitting diode (OLED), and the pixel capacitance is the parasitic capacitance (Coled) of the OLED. The first reset module 1011 in pixel circuit 101 includes a thin-film transistor T7. The intermediate node N4 between the OLED and transistor T7 is the first node. The gate of transistor T7 serves as the first reset control terminal of pixel circuit 101, and the source / drain of transistor T7 serves as the first initialization terminal of pixel circuit 101. The other terminal of transistor T7 is electrically connected to node N4. Figure 2 As shown, transistor T7 is electrically connected to the first voltage signal line 1021 (Vinit2). The Vinit2 signal line is an initialization signal line 102 that can transmit the first initialization voltage (Vinit2 voltage). Transistor T7 is a P-type transistor. When the first reset control signal (RSTV_H) input to the first reset control terminal is low, transistor T7 is turned on, allowing the Vinit2 voltage to be transmitted to node N4. In this embodiment, 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 also includes transistors T1 to T6, transistor T8, and capacitor Cst. Transistor T1 is electrically connected to the RSTV_P signal line, the Vinit1 signal line, and node N3, respectively. Transistor T2 is electrically connected to the NSTV signal line, node N1, and node N3, respectively. Transistor T3 is electrically connected to node N1, node N2, and node N3, respectively. Transistor T4 is electrically connected to the GSTV signal line, the Data[m] signal line, and node N2, respectively. Transistor T5 is electrically connected to the ESTV signal line, the ELVDD signal line, and node N2, respectively. Transistor T6 is electrically connected to the ESTV signal line, node N3, and node N4, respectively. Transistor T8 is electrically connected to the RSTV_H signal line, the Vinit3 signal line, and node N2, respectively.

[0059] In this embodiment, the pixel circuit 101 includes a first reset module 1011, which is electrically connected to a first node, a first reset control terminal, and a first initialization terminal. 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 the first voltage signal line 1021. Thus, the light-emitting elements of the first and second sub-pixels 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 input to the first initialization terminal to the first node under the control of the first reset control signal input to the first reset control terminal, it resets the first node and the light-emitting elements electrically connected to the first node, or compensates and charges the pixel capacitance of the light-emitting elements 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 circuit 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 compensation charging function of the pixel capacitor can be realized, which helps to reduce the cost of the display panel 10.

[0060] Optionally, the pixel circuit 101 includes:

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

[0062] The second reset module 1012 is electrically connected to the first node, the second reset control terminal, and the second initialization terminal, respectively. It 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 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 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 a first node. The first node is electrically connected to an initialization signal line 102 through the first reset module 1011, and to another initialization signal line 102 through the second reset module 1012. The first reset module 1011 is specifically used to reset the light-emitting element, and its structure can be as described in the previous embodiments. However, the second reset module 1012 is specifically used to control the compensation charging of the pixel capacitor of the light-emitting element. The second reset modules 1012 for different color sub-pixels are electrically connected to different initialization signal lines 102. This allows the second reset module 1012 to input different initialization voltage values ​​to the pixel circuits 101 of different color sub-pixels, thereby compensating the pixel capacitor of the light-emitting element.

[0065] Specifically, the pixel circuit 101 further 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 the second reset control signal. The second initialization terminal can be electrically connected to the second voltage signal line 1022 and can receive the second initialization voltage transmitted by the second voltage signal line 1022. 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. Under the control of the second reset control signal input at the second reset control terminal, it can transmit the second initialization voltage input at the second initialization terminal to the first node, 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. This second voltage signal line 1022 is connected to the power module of the display driving circuit of the display panel 10, allowing the terminal to receive the initialization voltage (i.e., the second initialization voltage) sent by the power module for charging compensation. 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. This second voltage signal line 1022 is connected to the power module of the display driving circuit of the display panel 10, ensuring that the second initialization terminals of the first and second sub-pixels are electrically connected to different second voltage signal lines 1022.

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

[0068] The first transistor T9 has its control electrode 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 the gate, the first electrode may be the source / drain, and the second electrode may be the drain / source. This is merely illustrative, and the embodiments of this application are not intended to limit the scope of the invention.

[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 a second reset control terminal. The first transistor T9 and its first electrode are electrically connected to the second voltage signal line 1022 on the display panel 10 as a second initialization terminal. 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 at the second reset control terminal, transmitting the second initialization voltage input at the second initialization terminal to the first node to compensate and charge the pixel capacitance of the light-emitting element based on the first node.

[0071] Figure 3 This is a second schematic diagram of the structure of a pixel circuit 101 provided in an embodiment of this application. For example... Figure 3 As shown, the second reset module 1012 in the pixel circuit 101 includes a first transistor T9. The gate of transistor T9 serves as the second reset control terminal of the pixel circuit 101, and the source / drain of transistor T9 serves as the second initialization terminal of the pixel circuit 101. The other terminal of transistor T9 is electrically connected to the first node (node ​​N4). Figure 3 As shown, transistor T9 is electrically connected to the second voltage signal line 1022 (Vinit4). The Vinit4 signal line is an initialization signal line 102 that can transmit the second initialization voltage (Vinit4 voltage). Transistor T9 is a P-type transistor. When the second reset control signal (RSTV_C) input to the second reset control terminal is low, transistor T9 is turned on, allowing the Vinit4 voltage to be transmitted to node N4. In this embodiment, 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 capacitor Cst. Transistor T1 is electrically connected to the RSTV_P signal line, the Vinit1 signal line, and node N3, respectively. Transistor T2 is electrically connected to the NSTV signal line, node N1, and node N3, respectively. Transistor T3 is electrically connected to node N1, node N2, and node N3, respectively. Transistor T4 is electrically connected to the GSTV signal line, the Data[m] signal line, and node N2, respectively. Transistor T5 is electrically connected to the ESTV signal line, the ELVDD signal line, and node N2, respectively. Transistor T6 is electrically connected to the ESTV signal line, node N3, and node N4, respectively. Transistor T7 is electrically connected to the RSTV_H signal line, the Vinit2 signal line, and node N4, respectively. Transistor T8 is electrically connected to the RSTV_H signal line, the Vinit3 signal line, and node N2, respectively. In this embodiment, when the pixel capacitor is charged by the Vinit4 voltage, the voltage values ​​of Vinit1 to Vinit3 are not limited. For example, the Vinit1 voltage can be -4V, the Vinit2 voltage can be -0.8V, and the Vinit3 voltage can be 6.8V.

[0073] In this embodiment, 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, 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. In this way, the pixel capacitor can be easily and conveniently controlled for compensation charging through the first transistor T9, improving the practicality of the display panel 10.

[0074] In this embodiment, 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 a first node, a first reset control terminal, and a first initialization terminal, respectively. The second reset module 1012 is electrically connected to the first node, a second reset control terminal, and a second initialization terminal, respectively. The second initialization terminals of the first sub-pixel and the second sub-pixel are electrically connected to different second voltage signal lines 1022, and the initialization signal lines 102 include second voltage signal lines 1022. Thus, the light-emitting elements of the first and second sub-pixels are electrically connected to different initialization signal lines 102 through the first node and the second reset module 1012. The pixel circuit 101 is configured to 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, to reset the first node and the light-emitting elements electrically connected to the first node; and 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, to compensate and charge the pixel capacitor based on the first node. In this way, the same initialization voltage can be provided to the pixel circuits 101 of the first and second sub-pixels to realize the reset function of the light-emitting element. Different initialization voltages can be provided to the pixel circuits 101 of the first and second sub-pixels respectively to realize the compensation charging function of the pixel capacitor. The reset function and the compensation 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 different color sub-pixels, 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 terminals in the pixel circuits 101 of the first sub-pixel and the second sub-pixel are 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 transistor T9 in the first sub-pixel and the second sub-pixel to turn on simultaneously, so as to transmit the second initialization voltage input by the second initialization terminal to the first node in each pixel circuit 101 simultaneously.

[0077] In this way, the pixel circuit 101 in the first sub-pixel and the second sub-pixel can start charging the pixel capacitor simultaneously, avoiding differences in the charging start time of different color sub-pixels. This is beneficial to charge the capacitor voltage corresponding to the pixel capacitor of different color sub-pixels to the turn-on voltage of the light-emitting element within the same time, so that the lighting time of different color sub-pixels is approximately the same.

[0078] In some embodiments, the first sub-pixel is a G pixel, and the light emitted by the light-emitting element of the first sub-pixel is green. The second sub-pixel is an R pixel or a B pixel, meaning that the light emitted by the light-emitting element of the second sub-pixel is red or blue. Furthermore, 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 in the G pixel is the largest, while the turn-on voltage Vop of the light-emitting diode in the R / B pixels is smaller.

[0079] In some embodiments, to ensure that the light-emitting elements in the first and second sub-pixels have approximately the same turn-on time, the pixel capacitors in the first and second sub-pixels need to be charged to the turn-on voltage of the light-emitting elements within the same time frame. Since the turn-on voltage of the light-emitting elements in the first sub-pixel is greater than that in the second sub-pixel, when compensating for the pixel capacitor charging based on the initialization voltage, the initialization voltage corresponding to the first sub-pixel can be set to be larger, i.e., the initialization voltage value corresponding to the first sub-pixel is greater than the initialization voltage value corresponding to the second sub-pixel. This can accelerate the charging speed of the pixel capacitor of the G pixel, shorten the charging time, and make the turn-on time of the G pixel approximately the same as that of the R / B pixels.

[0080] This application embodiment also provides a display module, which includes a display driving circuit and a display panel 10 as described in the foregoing 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. It can send control signals 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 capacitors 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 turn-on time of the light-emitting element in the first sub-pixel and the second sub-pixel is approximately the same.

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

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

[0084] Thus, the display driving circuit can also include a control module. Under the control of the control module, the power supply module can provide different initialization voltages to the initialization signal lines 102 corresponding to the first sub-pixel and the second sub-pixel through different voltage output terminals to meet the compensation charging requirements of the first sub-pixel and the second sub-pixel respectively. This allows the capacitor voltages corresponding to the pixel capacitors of the first sub-pixel and the second sub-pixel to be charged to the turn-on voltage of the light-emitting element at the same or similar time. As a result, the light-emitting elements of the first sub-pixel and the second sub-pixel can emit light simultaneously, making the start-up time of different color sub-pixels approximately the same.

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

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

[0087] Alternatively, a first initialization voltage with the same voltage value can be provided to multiple 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 supply module in the display driving circuit can provide a first initialization voltage of the same value to multiple first voltage signal lines 1021 on the display panel 10, such as providing a negative Vinit2 voltage, to reset the first node and the light-emitting elements electrically connected to the first node. For example, the Vinit2 voltage is -1V. Figure 2 The node N4 and OLED anode shown are reset.

[0089] Alternatively, the power module in the display driver circuit can provide different initialization voltage values ​​to the first voltage signal lines 1021 corresponding to the first and second sub-pixels on the display panel 10. For example, the Vinit2 voltage can be set to a high voltage. The Vinit2 voltage corresponding to different color sub-pixels is different. The higher the turn-on voltage of the light-emitting element, the higher the corresponding Vinit2 voltage. The pixel capacitor 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 multiple 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 multiple 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 second initialization voltages with 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 compensate and charge the pixel capacitors according to the second initialization voltage.

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

[0093] Furthermore, the power module in the display driving circuit is electrically connected to multiple second voltage signal lines 1022 of the display panel 10. It can provide second initialization voltages of different values ​​to the second voltage signal lines 1022 corresponding to the first and second sub-pixels on the display panel 10, such as providing a positive Vinit4 voltage. The Vinit4 voltage corresponding to different color sub-pixels is different. The larger the turn-on voltage of the light-emitting element, the larger the corresponding Vinit4 voltage. Based on the first node, the pixel capacitance of the light-emitting element is compensated and charged. 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] The display module provided in this application embodiment can achieve the same or similar technical effects as the display panel 10 in the aforementioned embodiment. To avoid repetition, it will not be described again here.

[0095] This application also provides a display device, which includes the display module as described in the foregoing embodiments.

[0096] The display device provided in this application embodiment can achieve the same or similar technical effects as the display panel 10 in the foregoing embodiment. To avoid repetition, it will not be described again here.

[0097] In related technologies, display panels are tested at a 2-nit brightness band, displaying images at three grayscale levels: R128, G128, and B128. Figure 4 The table shows the data voltage output by the source drive circuit of the display panel and the screen brightness test waveform. R and B pixels light up in the second frame, while G pixels light up in the fourth frame, resulting in a purple screen for the first two frames. Table 1 shows the number of frames at which R / G / B pixels light up under different brightness levels. As shown in Table 1, at low brightness, the G pixel lights up significantly later than R and B, causing the screen to display purple (with a reddish-blue tint) at the moment of illumination, and the number of delayed frames varies under different brightness levels. Here, Band refers to the brightness of the W255 screen on the OLED product, similar to the brightness bar on a mobile phone. Band adjusts the screen brightness. Typically, the lowest brightness Band is 2 nits, in which case the W255 screen brightness is 2 nits, with 255 gray levels from 0 to 2 nits, and the brightness distribution satisfies the Gamma 2.2 curve.

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

[0099]

[0100]

[0101] Figure 5 This is a flowchart illustrating the steps of a display driving method provided in an embodiment of this application, as follows: Figure 5 As shown, the display driving method includes:

[0102] Step S1: In the target frame, the pixel circuit 101 of the sub-pixel in the display panel 10 is controlled 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 different color sub-pixels at the same or similar time when powered on in a low-brightness screen, thereby improving the color distortion of the displayed image when the screen is turned on. The low-brightness screen is, for example, a 2-nit band screen. The execution body of this display driving method can be a display driving circuit electrically connected to the display panel 10 in the display device. This display driving method can be used to drive the display panel 10 as described in the previous embodiment, that is, a display panel 10 in which the light-emitting elements of different color sub-pixels are electrically connected to different initialization signal lines 102. Alternatively, this display driving method can also be used to drive a display panel in which different color sub-pixels are electrically connected to the same initialization signal line; this application embodiment does not limit this.

[0104] In some embodiments, within the target frame of the display driving process, the pixel circuits 101 of different color sub-pixels in the display panel 10 can be controlled to compensate and charge the pixel capacitors corresponding to the light-emitting elements in the pixel circuits 101 of each sub-pixel. This allows the pixel capacitors of different color sub-pixels to be charged to the turn-on voltage of the light-emitting elements at the same or similar time, thereby enabling the light-emitting elements of different color sub-pixels to emit light at the same or similar time. In other words, the start-up times of the light-emitting elements of different color sub-pixels are approximately the same within the target frame. Here, "approximately the same start-up time" means that the light-emitting elements of different color sub-pixels can light up within the same frame, and the difference between the start-up times of different color sub-pixels is less than or equal to one frame time.

[0105] In some embodiments, the target frame can be the first frame of the display frame. Within the first frame, the pixel circuits 101 of different color sub-pixels are controlled to compensate and charge the pixel capacitors corresponding to the light-emitting elements. Thus, starting from the second frame, the image can be displayed based on the display data sent from the front end. Alternatively, the target frame can be a compensation frame preceding the display frame. Within the compensation frame, the pixel circuits 101 of different color sub-pixels are controlled to compensate and charge the pixel capacitors corresponding to the light-emitting elements. Thus, starting from the first frame of the display frame, the image can be displayed based on the display data sent from the front end. The number of compensation frames can be one or multiple frames; this embodiment does not limit this. To display the boot screen faster, one compensation frame is sufficient.

[0106] For example, black insertion frames are typically set before the display frames to avoid unnecessary clutter and ensure a stable display. In this embodiment, two black insertion frames plus one compensation frame, or three black insertion frames plus one compensation frame, can be set. The black insertion frames and compensation frames are independent of each other. This is merely an example, and the embodiments of this application do not impose any limitations on this.

[0107] In some embodiments, the display driving circuit can calculate a data voltage, called the compensation data voltage, for compensating and charging the pixel capacitors based on the display data sent by the front end. The compensation data voltage values ​​corresponding to different color sub-pixels are not equal. Then, in the target frame, the compensation data voltage is sent to the data signal lines of the display panel 10 through the source driving circuit (Source IC) of the display panel 10, so that the pixel capacitors of the pixel circuits 101 in different color sub-pixels are compensated and charged by the compensation data voltage. Here, the front end can be a system-on-chip (SOC) of the host computer, and the display data can include brightness band and grayscale information, as well as display control commands, etc.

[0108] In this way, when the first display frame arrives after the target frame, the capacitor voltages corresponding to the pixel capacitors of different color sub-pixels are charged to the turn-on voltage of the light-emitting elements, so the light-emitting elements of different color sub-pixels can light up simultaneously, ensuring that the turn-on time of different color sub-pixels is consistent and there is no abnormal color shift during power-on. For display frames other than the target frame, the display driving circuit can obtain normal data voltage according to the display data, and the source driving circuit provides data voltage to the display panel 10 to drive the display panel 10 to display the corresponding image.

[0109] In some embodiments, such as Figure 2As shown, during the initialization phase of the pixel circuit 101, the parasitic capacitance of the light-emitting diode (LED) can be pre-charged using a first initialization voltage (Vinit2 voltage). This charges the parasitic capacitance to a level equal to or slightly lower than the LED's turn-on voltage, allowing the LED to respond quickly and emit light when the data voltage arrives. 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 RSTV_H, the faster the Vinit2 voltage charges the LED's parasitic capacitance to its turn-on voltage. Therefore, in this embodiment, by adjusting the width of the effective level range (i.e., the effective level duration) of the reset control signal RSTV_H in the target frame, the pixel capacitance of different color sub-pixels can be compensated and charged, ensuring that the lighting times of different color sub-pixels are approximately the same.

[0110] In some embodiments, for the display panel 10 provided in this embodiment, since the light-emitting elements of the first sub-pixel and the second sub-pixel are electrically connected to different initialization signal lines 102, and the pixel capacitance values ​​of the first sub-pixel and the second sub-pixel are not equal, the light emitted by the light-emitting elements of the first sub-pixel and the second sub-pixel is of different colors. 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. The power supply module in the display driving circuit provides different initialization voltage values ​​to the different initialization signal lines 102 in the target frame to compensate and charge the pixel capacitors of the sub-pixels of different colors. In this way, the lighting time of the sub-pixels of different colors is approximately the same, which can reduce the difference in lighting time of the sub-pixels of different colors and improve the color deviation abnormality of the displayed image when the screen is turned on.

[0111] Optionally, step S1 may include:

[0112] In sub-step A1, the compensation data voltage is obtained according to the display data, and the corresponding compensation data voltage is sent to the data signal lines of different color sub-pixels in the display panel 10 in the target frame, so that the pixel circuit 101 of the sub-pixel compensates and charges 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 can be data and control commands sent from the front end of the display driver circuit. For example, the display data may include brightness band and grayscale information, as well as display control commands, such as screen-on commands, for example, the 0x29 (Display on) command. Figure 6As shown, after receiving the screen-on command, the display driver circuit activates the compensation scheme (compensation IP). It determines the first display frame or the data voltage of the preceding few display frames based on the brightness band and grayscale information in the display data. Then, it uses the compensation lookup table (LUT) to retrieve the corresponding compensation value for the display frame's data voltage, which is used as the compensation data voltage value. Furthermore, the display driver circuit also normally retrieves the data voltages of other display frames based on the brightness band and grayscale information in the display data.

[0114] In the target frame (the first frame of the display frame, and / or the compensation frame before the display frame), compensation data voltages corresponding to different color sub-pixels are sent to the data signal lines, so that the pixel circuit 101 of each sub-pixel compensates and charges the pixel capacitor according to its corresponding compensation data voltage, charging the pixel capacitor of each color sub-pixel to the turn-on voltage of the light-emitting element. Figure 6 As shown, in the first display frame after the target frame, normal data voltage is sent to the data signal line corresponding to each sub-pixel, driving the light-emitting elements 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 different color sub-pixels is approximately the same.

[0115] In some embodiments, the light-emitting element is a light-emitting diode, such as an OLED. The OLED is current-driven. 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. 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 required driving current, and the smaller the corresponding compensation data voltage value. That is, the compensation data voltage value is negatively correlated with the turn-on voltage of the light-emitting element. For example, in the R / G / B pixel unit, the turn-on voltage of the light-emitting element is B < R < G. Therefore, the compensation data voltage value corresponding to the B pixel is the largest, followed by the R pixel, and the G pixel is the smallest.

[0116] Figure 7 This is a waveform diagram of a display driving method provided in an embodiment of this application. For example... Figure 7As shown, two black insertion frames and one compensation frame are set before the display frame, and the target frame is the compensation frame preceding the display frame. In the compensation frame, the display driving circuit sends 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 higher the turn-on voltage of the light-emitting element, the lower the corresponding compensation data voltage, ensuring that the pixel capacitors of different color sub-pixels are approximately fully charged within the compensation frame. Thus, when the first display frame arrives, the light-emitting elements of different color sub-pixels can emit light simultaneously within the first frame, ensuring that the start-up times of different color sub-pixels are approximately the same, and allowing the display panel 10 to display the image more quickly after the host SOC sends the screen-on command.

[0117] In some embodiments, the compensation LUT can be pre-tuned according to the characteristics of the display device. Furthermore, for specific compensation frames and different display frames, different compensation values ​​can be adjusted to the compensation LUT to prevent sudden brightening of the display panel 10 and improve its display quality. Specifically, the compensation LUT includes the compensation values ​​corresponding to the brightness band and grayscale information of the compensation frame. After receiving the screen-on command, the display driving circuit directly looks up the compensation LUT to obtain the pre-set compensation values ​​corresponding to the brightness band and grayscale information, which are used as compensation data voltages. Then, the compensation data voltages are sent to the display panel 10 in the compensation frame.

[0118] Alternatively, compensation values ​​can be pre-set for various different display frames in the compensation LUT. After receiving the screen-on command, the display driving circuit looks up the compensation LUT according to the brightness band and grayscale information of the first frame in the display data to obtain the compensation value corresponding to the brightness band and grayscale information closest to the first frame, which is then used as the compensation data voltage. The compensation data voltage is then sent to the display panel 10 in the first frame. This is only an example, and the embodiments of this application do not limit the scope of the invention.

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

[0120] Optionally, step S1 may include:

[0121] Sub-step A2 involves obtaining the effective level range of the first reset control signal based on the display data, and sending the corresponding first reset control signal to the first reset signal line of different color sub-pixels in the display panel 10 in the target frame. This causes the pixel circuit 101 of the sub-pixel to conduct the first initialization terminal and the light-emitting element within the effective level range of the first reset control signal, and to compensate and charge the pixel capacitor according to the first initialization voltage input to the first initialization terminal. The width of the effective level range 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 a screen-on command, the display driver circuit activates the compensation IP. It determines the width of the effective level range of the first reset control signal in the first frame of the display frame, or the first few display frames preceding the first frame, based on the brightness band and grayscale information in the display data. Then, it uses the compensation LUT to look up the table based on this effective level range width to obtain the compensation value corresponding to the width of the effective level range of the display frame, which is used as the width of the effective level range of the first reset control signal in the target frame. Furthermore, the display driver circuit also normally obtains the width of the effective level range of the first reset control signal in other display frames based on the brightness band and grayscale information in the display data.

[0123] In the target frame, a first reset control signal corresponding to each color sub-pixel in the display panel 10 is sent to the first reset signal line. The effective level range of the first reset control signal corresponding to different color sub-pixels is different. The width of the effective level range is positively correlated with the turn-on voltage of the light-emitting element of the corresponding sub-pixel. The larger the turn-on voltage of the light-emitting element, the wider the effective level range of the corresponding first reset control signal.

[0124] For example, each pixel unit on the display panel 10 includes R / G / B pixels, where the turn-on voltage Vop of the light-emitting diode in the G pixel is the largest, while the turn-on voltage Vop of the light-emitting diodes in the R / B pixels is smaller. Since the width of the effective level range 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 range of the RSTV_H signal corresponding to the G pixel is the largest, and that of the R / B pixels is smaller.

[0125] Taking a display panel with a 2nit band and 255 grayscale brightness as an example, the width of the effective RSTV_H signal level range corresponding to R / B pixels is 4H, and the width of the effective RSTV_H signal level range corresponding to G pixels is 8H. In a 2nit band and 255 grayscale brightness display, the width of the effective RSTV_H signal level range corresponding to R / B pixels is 8H, and the width of the effective RSTV_H signal level range corresponding to G pixels is 16H. Here, 1H typically represents the horizontal scan cycle, i.e., the total time required to complete a line of pixel scanning. This is merely an example; the specific width can be adjusted according to application requirements, as long as the width of the effective level range is positively correlated with the turn-on voltage of the light-emitting element. This application does not impose any limitations on this aspect.

[0126] In this way, during the effective level range of the first reset control signal, the pixel circuit 101 conducts its first initialization terminal and the light-emitting element. The first initialization voltage input from the first initialization terminal is transmitted to the first node and the light-emitting element. 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 charging to the OLED's turn-on voltage Vop.

[0127] The target frame can be the first frame of the display frame, and / or a compensation frame preceding the display frame. Furthermore, during the initialization phase of the target frame, corresponding first reset control signals can be sent to the first reset signal lines of different color sub-pixels in the display panel 10. Thus, during the light-emitting phase of the target frame, the driving transistors in the pixel circuit 101 can drive the light-emitting elements to emit light. Since the pixel capacitors of different color sub-pixels are all charged to the turn-on voltage of the light-emitting elements during the initialization phase, the light-emitting elements of different color sub-pixels can all emit light during the light-emitting phase, meaning the light-emitting times of different color sub-pixels are approximately the same.

[0128] like Figure 7 As shown, in each display frame after the target frame, the effective level range of the first reset control signal is restored to the normal width in the display data. For example, the width of the effective level range of the first reset control signal corresponding to different color sub-pixels is approximately equal.

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

[0130] For example, since the G pixel lights up the latest, the width of the effective level range of the RSTV-H signal corresponding to the G pixel can be increased. This will make the light-emitting element of the G pixel light up faster, ultimately ensuring that the lighting times of the R / G / B pixels are consistent. Figure 8 As shown, the high level of the RSTV-H signal is equal to the VGH voltage, which can be 8.3V, and the low level of the RSTV-H signal is equal to the VGL voltage, which can be -9V.

[0131] It should be noted that even if the width of the effective level range of the first reset control signal is increased, the adjusted effective level range should still be within the effective level range of the light emission control signal, such as the ESTV signal. Figure 8 As shown, the low-level range of the widened RSTV-H signal is still within the high-level range of the ESTV signal. This allows the pixel circuit to 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 different color sub-pixels can emit light, making the light-emitting times of different color sub-pixels approximately the same.

[0132] In this embodiment, the wider the effective level range of the first reset control signal, the faster the pixel capacitor of the corresponding sub-pixel charges to the turn-on voltage of the light-emitting element, and the faster the light-emitting element lights up. That is, the width of the effective level range is positively correlated with the turn-on voltage of the light-emitting element. Therefore, the width of the effective level range of the first reset control signal corresponding to the sub-pixel with the highest turn-on voltage of the light-emitting element can be increased to accelerate the turn-on speed of the light-emitting element of the sub-pixel with the highest turn-on voltage, making the turn-on time of other color sub-pixels approximately the same. Alternatively, the width of the effective level range of the first reset control signal corresponding to different color sub-pixels can be adjusted simultaneously, setting the width of the effective level range corresponding to the sub-pixel with the highest turn-on voltage of the light-emitting element in each sub-pixel to be the widest, while the width of the effective level range for other color sub-pixels can be reduced accordingly based on the turn-on voltage of the light-emitting element.

[0133] In some embodiments, a row of the pixel array contains sub-pixels of different colors, such as R, G, and B. The pixel circuits 101 of each sub-pixel in the same row are typically electrically connected to the same RSTV_H signal line. Therefore, changing the width of the effective level range of the RSTV_H signal will affect sub-pixels of different colors simultaneously. In this embodiment, a compromise value for the effective level range width can be adjusted for the sub-pixels of different colors, making the on-time of the sub-pixels of different colors approximately equal. For example, when the display panel 10 is powered on in a low-brightness scene, the on-time of the R / G / B pixels remains consistent.

[0134] Specifically, taking the example of the highest turn-on voltage of the light-emitting element in the G pixel, the turn-on voltage of the light-emitting element in the R / B pixel is lower than that of the G pixel, and the start-up times of the R / B pixels are roughly the same. A compromise value can be determined based on the time difference between the start-up times of the R / B and G pixels under actual conditions; the smaller the time difference, the better. For example, the width of the effective level range of the RSTV_H signal can be adjusted first so that the R / B pixel lights up within one frame, and the width of the effective level range of the RSTV_H signal at this time is recorded as m. Then, a width n is adjusted so that the G pixel lights up within one frame. Finally, the width of the effective level range of the RSTV_H signal is determined as (m+n) / 2, thus balancing the time difference between the start-up times of the R / G / B pixels and making their start-up times roughly the same.

[0135] In some embodiments, the compensation LUT corresponding to the effective level interval can be obtained by referring to the relevant description of the compensation LUT corresponding to the compensation data voltage in the foregoing embodiments, and by debugging for specific compensation frames and different display frames. 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 driver circuit receives the screen-on command, it looks up the table of 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 obtained effective level interval, 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. The larger the turn-on voltage of the light-emitting element, the wider the width of the corresponding effective level interval.

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

[0137] Optionally, step S1 may include:

[0138] In sub-step A3, the initialization voltage is obtained according to the display data, and the corresponding initialization voltage is sent to the initialization signal line 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 compensates and charges 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 this embodiment. For different color sub-pixels, the initialization signal line 102 electrically connected to the light-emitting element in the pixel circuit 101 is separated. The power supply module in the display driving circuit provides different initialization voltage values ​​to the different initialization signal lines 102 in the target frame, so that the pixel capacitors of different color sub-pixels are charged to the turn-on voltage of the light-emitting element in the target frame, so that the lighting time of different color sub-pixels is approximately the same.

[0140] In some embodiments, the first voltage signal lines 1021 corresponding to the first initialization voltage of different color sub-pixels can be separated, that is, the first sub-pixel and the second sub-pixel are each electrically connected to different first voltage signal lines 1021. Here, the first voltage signal line 1021 is the initialization signal line 102. During the initialization phase of the target frame, the display driving circuit sends its corresponding first initialization voltage, such as the Vinit2 voltage, to the first voltage signal lines 1021 of the first and second sub-pixels. This causes the pixel circuits 101 of the first and second sub-pixels to charge the pixel capacitors to the turn-on voltage of the light-emitting elements during the initialization phase according to the first initialization voltage. Therefore, the light-emitting elements of the first and second sub-pixels light up at approximately the same time during the light-emitting phase.

[0141] Specifically, such as Figure 9 As shown, after receiving the screen-on command, the display driver circuit activates the compensation IP. It can determine the first frame of the display based on the brightness band and grayscale information in the display data, or the first initialization voltage (Vinit2 voltage) of the preceding few display frames starting from the first frame. Based on the Vinit2 voltage of the display frame, it calls the compensation LUT to look up the table and obtain the compensation value corresponding to the Vinit2 voltage of the display frame. Furthermore, the display driver circuit also normally obtains the Vinit2 voltage of other display frames based on the brightness band and grayscale information 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), a first initialization voltage corresponding to the voltage value is sent to the first voltage signal line 1021 of the first sub-pixel and the second sub-pixel, so that the pixel circuit 101 of each sub-pixel charges the pixel capacitor approximately to the turn-on voltage of the light-emitting element according to its corresponding first initialization voltage. Figure 9 As shown, in the first display frame after the target frame, a normal first initialization voltage, such as a negative 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 display frame, the Vinit2 voltage is also negative during the black insertion frame preceding the display frame.

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

[0144] Figure 10 This is a second timing diagram of a display driving method provided in an embodiment of this application. For example... Figure 10 As shown, a black insertion frame is set before the display frame. The target frame is the first display frame. The initial voltage in the black insertion frame and other display frames besides the target frame is negative, that is, the Vinit2 voltage is -1V. Figure 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 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 referring to the relevant description of the compensation LUT corresponding to the compensation data voltage in the foregoing embodiments, and by debugging for specific compensation frames and different display frames. 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-on command, it looks up the table of the compensation LUT and modifies the voltage value of the first initialization voltage in the target frame according to the obtained compensation value corresponding to the first initialization voltage, 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, both of which are electrically connected to a first node, which in turn is electrically connected to a light-emitting element. The second voltage signal lines 1022 for different color sub-pixels can be separated, meaning the first sub-pixel and the second sub-pixel are each electrically connected to different second voltage signal lines 1022. The second voltage signal line 1022 is an initialization signal line 102. During the initialization phase of the target frame, the display driving circuit sends corresponding second initialization voltages, such as Vinit4 voltages, to the second voltage signal lines 1022 of the first and second sub-pixels. This causes the pixel circuits 101 of the first and second sub-pixels to charge the pixel capacitors to the turn-on voltage of the light-emitting element during the initialization phase, resulting in approximately the same start-up time for the light-emitting elements of the first and second sub-pixels during the light-emitting phase.

[0147] In some embodiments, after receiving a screen-on command, the display driver circuit activates the compensation IP, calls the compensation LUT to look up the 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 for the first and second sub-pixels, so that the pixel circuit 101 of each sub-pixel charges the pixel capacitor approximately to the turn-on voltage of the light-emitting element according to its corresponding second initialization voltage. 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 the negative Vinit2 voltage. Under the control of the first reset control signal sent from the first reset signal line electrically connected to the pixel circuit 101, the first initialization voltage can reset the first node and the light-emitting element.

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

[0149] In this embodiment, the initial voltage value is positively correlated with the turn-on voltage of the light-emitting element. Therefore, the initial voltage value can be set specifically according to the turn-on voltage of the light-emitting element in different color sub-pixels, such as the first sub-pixel and the second sub-pixel. This allows the pixel capacitors of the first sub-pixel and the second sub-pixel to be charged to the turn-on voltage of the light-emitting element within the target frame. This makes the light-emitting elements of the first sub-pixel and the second sub-pixel light up at approximately the same time, improving the color distortion of the displayed image when the screen is turned on.

[0150] Optionally, step S1 may include:

[0151] In sub-step A4, at least in the target 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 of the pixel circuit 101 responds to the second reset control signal input to 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 when the target frame control pixel circuit 101 charges the pixel capacitor to the turn-on voltage of the light-emitting element according to the second initialization voltage, it is necessary to at least when the target frame control second reset module 1012 turns on the second initialization terminal and the first node, 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 preceding 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 to the second reset module 1012 through the second reset control terminal of the pixel circuit 101, so that the second reset module 1012 conducts 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 capacitor of the light-emitting element can be charged to the turn-on voltage of the light-emitting element based on the first node.

[0154] Figure 11 This is the third timing diagram of a display driving method provided in an embodiment of this application. Figure 3 Taking the pixel circuit 101 shown as an example, Figure 11 The timing diagram shows the ESTV, NSTV, RSTV_P, GSTV, and RSTV_H signals, as well as the second reset control signal RSTV_C in this embodiment. Figure 3 As shown, by sending an RSTV_C signal to the pixel circuit 101, the first transistor T9 can be turned 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). Then, the parasitic capacitance Coled of the OLED can be used to charge the OLED's turn-on voltage Vop based on node N4.

[0155] In some embodiments, the width of the effective level range of the second reset control signal RSTV_C can be equal to the width of the effective level range of the first reset control signal RSTV_H. For example... Figure 11As shown, the effective level range of both RSTV_C and RSTV_H signals is a low-level range, with the same range width, and the low-level voltage values ​​can also be equal. For example, the low-level range width of both RSTV_H and RSTV_C signals is 4H, the low level is equal to VGL voltage, and the high level is equal to VGH voltage. Figure 11 As shown, the low-level interval of the RSTV_C signal is delayed by 1H compared to 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 is made to Figure 8 As shown in the description of increasing the width of the low-level range of the RSTV-H signal to speed up the lighting of the light-emitting element, this embodiment can also accelerate the lighting speed of sub-pixels with higher turn-on voltages by adjusting the width of the effective level range of the second reset control signal (RSTV_C) corresponding to different color sub-pixels. Similar to the logic of adjusting the width of the effective level range of the first reset control signal RSTV_H, the width of the effective level range of the second reset control signal RSTV_C is positively correlated with the turn-on voltage of the light-emitting element. The higher the turn-on voltage of the light-emitting element, the wider the effective level range of the second reset control signal RSTV_C. This ensures that the pixel capacitors of different color sub-pixels charge to the turn-on voltage of the light-emitting element during the initialization phase, so that when the light-emitting phase arrives, the light-emitting time of the light-emitting elements in different color sub-pixels is approximately the same.

[0157] For example, the G pixel lights up the latest, such as Figure 11 As shown, the width of the low-level range of the RSTV_C signal corresponding to the G pixel can be increased, thus accelerating the lighting of the G pixel's light-emitting element and ultimately ensuring that the lighting times of the R / G / B pixels are consistent. Taking a display panel with a 2nit band and 255 grayscale lighting conditions as an example, the width of the effective level range of the RSTV_C signal corresponding to the R / B pixels is 4H, while the width of the effective level range of the RSTV_C signal corresponding to the G pixel is 8H. This is merely an illustrative example, and the embodiments of this application do not impose limitations on this.

[0158] In this embodiment, at least in the target frame, the second reset module 1012 in the pixel circuit 101 is controlled by the second reset control signal to turn on the second initialization terminal and the first node, thereby transmitting the second initialization voltage input by 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 in the target frame, so that the light-emitting elements of the first sub-pixel and the second sub-pixel light up at approximately the same time, thereby improving the color distortion 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 responds to the second reset control signal and turns on the second initialization terminal and the first node;

[0161] The target frame sends its corresponding initialization voltage to the initialization signal lines 102 of the first and second sub-pixels in the display panel 10, including:

[0162] In each display frame, a corresponding second initialization voltage is sent to the second voltage signal line 1022 of the first sub-pixel and the second sub-pixel in the display panel 10, so that the pixel circuit 101 of the sub-pixel compensates and charges the pixel capacitor according to the second initialization voltage.

[0163] In some embodiments, the color coordinates of pixels drift with temperature under low-temperature conditions, exhibiting a temperature drift phenomenon. Different color sub-pixels shift to different degrees. For example, at low temperatures, the current of the G pixel increases under the same data voltage, leading to increased brightness, while the relative increase in the R / B pixel is small, resulting in a greenish tint to the displayed image. In this embodiment, a second reset module 1012 is added to the pixel circuit 101, thus allowing the temperature drift to be improved by adjusting the second initialization voltage, such as the Vinit4 voltage.

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

[0165] Figure 12 This is the fourth timing diagram of a display driving method provided in an embodiment of this application. Figure 12 As shown, a black insertion frame is set before the display frame, and the target frame is the first display frame. For 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 its corresponding second initialization voltage (Vinit4 voltage) to the second voltage signal line 1022 corresponding to each of the R / G / B pixels.

[0166] like Figure 12As shown, within 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. Furthermore, for example, the first initialization voltage is negative, i.e., the Vinit2 voltage is -1V. In practical applications, to improve temperature drift, the Vinit4 voltage of the R / B pixels can be increased at low temperatures, which can increase the brightness of the R / B pixels, preventing the displayed image from having a greenish tint and increasing the overall brightness of the display panel 10. Brightness adjustment can be achieved by readjusting 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 within the same frame, after sending the first reset control signal to the first reset signal line of the display panel 10, the second reset control signal is sent after a first delay.

[0169] In some embodiments, in each display frame, a first reset control signal can be sent to the first reset signal line of the display panel 10, causing the first reset module 1011 of the pixel circuit 101 to respond to the first reset control signal and turn on the first initialization terminal and the first node. Furthermore, in each display frame, a first initialization voltage of the same value is sent to the first voltage signal lines 1021 of the first and second sub-pixels in the display panel 10, causing the first initialization voltage to be transmitted to the first node and the light-emitting element electrically connected to the first node, thereby resetting the first node and the light-emitting element. For example, as... Figure 3 As shown, the positive charge on the anode of the LED in the R / G / B pixel is eliminated by the negative voltage Vinit2 to reset node N4 and the LED.

[0170] In this embodiment, as Figure 12 As shown, when the display driving circuit sends a first reset control signal and a second reset control signal to the display panel 10 within the same frame, it first sends a first reset control signal to the first reset signal line to control the first reset module 1011 to turn on the first initialization terminal and the first node, as shown. Figure 3 The Vinit2 terminal and node N4 are shown. Then, after a first delay, a second reset control signal is sent to the second reset signal line to control the second reset module 1012 to turn on the second initialization terminal and the first node, as shown. Figure 3 The Vinit4 terminal and node N4 are shown. The first 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 duration can be determined according to actual application requirements, for example, ... Figure 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. 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 first by the Vinit2 voltage to improve the abnormal phenomena such as image retention 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 abnormal color shift when the low brightness screen is powered on, thereby improving the display quality of the display panel 10.

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

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

[0174] In some embodiments, the light emission control signal line of the display panel 10 can be as follows: Figure 2 or Figure 3 In the pixel circuit shown, the ESTV terminal is electrically connected to the ESTV signal line, and the light emission control signal is the ESTV signal sent by the display driver circuit to the ESTV signal line. Alternatively, the light emission control signal line can be as follows: Figure 10 or Figure 12 The timing diagram shows the EM signal line corresponding to the EM signal, and the emission control signal is the EM signal. The EM signal (Emission Signal) is a type of emission control signal used to control the emission state of a pixel. The ESTV signal is usually the start signal of the EM signal, used to indicate the start time of the EM signal within a frame. This is merely an example, and the embodiments of this application do not impose limitations.

[0175] It should be noted that even with the first delay, the second reset control signal RSTV-C should still be within the effective level range of the light emission control signal, such as the ESTV signal. Figure 11 and Figure 12 As shown, the low-level range of the RSTV-C signal after a 1-hour delay is still within the high-level range of the ESTV signal. This allows the pixel circuit to 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 different color sub-pixels can emit light, making the light-emitting times of different color sub-pixels approximately the same.

[0176] In some embodiments, the compensation LUT corresponding to the second initialization voltage can be obtained by referring to the relevant description of the compensation LUT corresponding to the compensation data voltage in the foregoing embodiments, and by debugging for specific compensation frames and different display frames. 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-on command, it looks up the table of the compensation LUT and modifies the voltage value of the second initialization voltage in the target frame according to the obtained compensation value corresponding to the 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, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

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

[0179] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0180] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0181] The above provides a detailed description of a display panel, display module, display device, and display driving method provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display panel, characterized by, The display panel comprises: A plurality of sub-pixels, the pixel circuit of the sub-pixel comprises a light emitting element, and the pixel capacitor corresponding to the light emitting element; the plurality of sub-pixels at least comprises 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 are not equal in capacitance value, 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, the light emitting element of the first sub-pixel and the light emitting element of the second sub-pixel are electrically connected with different initialization signal lines; A first reset module, the first reset module is electrically connected with a first node, a first reset control end and a first initialization end respectively, and is configured to, under the control of a first reset control signal input at the first reset control end, turn on the first initialization end of the pixel circuit and the light emitting element in an effective level interval of the first reset control signal, transmit a first initialization voltage input at the first initialization end to the first node, compensate and charge the pixel capacitor of the light emitting element based on the first node, the first reset control signal is sent by a first reset signal line of different color sub-pixels in the display panel, and the effective level interval of the first reset control signal is within a target level interval, the target level interval is an effective level interval corresponding to a light emitting control signal, and the light emitting control signal is sent by a light emitting control signal line of the display panel.

2. The display panel of claim 1, wherein, The pixel circuit comprises: A first reset module, the first reset module is electrically connected with a first node, a first reset control end and a first initialization end respectively, and is configured to, under the control of a first reset control signal input at the first reset control end, transmit a first initialization voltage input at the first initialization end to the first node, and reset the first node and the light emitting element electrically connected with the first node; Wherein, the first initialization end of the first sub-pixel and the first initialization end of the second sub-pixel are electrically connected with different first voltage signal lines; the initialization signal line comprises the first voltage signal line.

3. The display panel of claim 1, wherein, The pixel circuit comprises: A first reset module, the first reset module is electrically connected with a first node, a first reset control end, a first initialization end respectively, and is configured to, under the control of a first reset control signal input at the first reset control end, transmit a first initialization voltage input at the first initialization end to the first node, and reset the first node and the light emitting element electrically connected with the first node; A second reset module, the second reset module is electrically connected with the first node, a second reset control end and a second initialization end respectively, and is configured to, under the control of a second reset control signal input at the second reset control end, transmit a second initialization voltage input at the second initialization end to the first node, and 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 with different second voltage signal lines, and the initialization signal line includes the second voltage signal line.

4. The display panel of claim 3, wherein, The second reset module includes: The first transistor has a control electrode electrically connected with a second reset signal line of the display panel, and the control electrode of the first transistor serves as the second reset control end; a first electrode of the first transistor is electrically connected with the second voltage signal line, and the first electrode of the first transistor serves as the second initialization end; and a second electrode of the first transistor is electrically connected with the first node.

5. The display panel of claim 4, wherein The second reset control end of the first sub-pixel and the second reset control end of the second sub-pixel are electrically connected with the same second reset signal line.

6. A display module, characterized by The display module includes a display driving circuit and the display panel of any one of claims 1-5; and the display panel is electrically connected with the display driving circuit.

7. The display module of claim 6, wherein, The display driving circuit includes a power supply module electrically connected with a plurality of initialization signal lines of the display panel and 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 of claim 7, wherein, The power supply module is electrically connected with a plurality of first voltage signal lines of the display panel. The power supply module is configured to provide a first initialization voltage with different voltage values to the first voltage signal lines corresponding to the first sub-pixel and the second sub-pixel, so that the pixel circuit of each of the first sub-pixel and the second sub-pixel compensates and charges the pixel capacitor according to the first initialization voltage. Alternatively, the power supply module 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 with the first node according to the first initialization voltage.

9. The display module of claim 7, wherein, The power supply module is electrically connected with a plurality of first voltage signal lines of the display panel and 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 with the first node according to the first initialization voltage. The power supply module is also electrically connected with a plurality of second voltage signal lines of the display panel and configured to provide a second initialization voltage with different voltage values to the second voltage signal lines corresponding to the first sub-pixel and the second sub-pixel, so that the pixel circuit of each of the first sub-pixel and the second sub-pixel compensates and charges the pixel capacitor according to the second initialization voltage.

10. A display device, characterized by comprising: The display device includes the display module of any one of claims 6-9.

11. A display driving method, comprising: The display driving method includes: controlling a pixel circuit of a sub-pixel in a display panel to charge a pixel capacitor corresponding to a light emitting element in the pixel circuit in a target frame; wherein the target frame includes at least a first frame of a display frame and / or one or more compensation frames before the display frame. The pixel circuit of the sub-pixel in the display panel is controlled in the target frame, and the pixel capacitor corresponding to the light emitting element in the pixel circuit is charged, and the method comprises the steps of: According to the display data, the effective level interval of the first reset control signal is obtained, and in the target frame, the respective corresponding first reset control signal is sent to the first reset signal line of the different color sub-pixels in the display panel, so that the first initialization end of the pixel circuit of the sub-pixel is turned on with the light emitting element in 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, and the effective level interval of the first reset control signal is within the target level interval, and the target level interval is the effective level interval corresponding to the light emitting control signal, and the light emitting control signal is sent by the light emitting control signal line of the display panel.

12. The display driving method according to claim 11, wherein The pixel circuit of the sub-pixel in the display panel is controlled in the target frame, and the pixel capacitor corresponding to the light emitting element in the pixel circuit is charged, and the method comprises the steps of: According to the display data, the compensation data voltage is obtained, and in the target frame, the respective corresponding compensation data voltage is sent to the data signal line of the different color sub-pixels in the display panel, so that the pixel circuit of the sub-pixel is compensated and charged according to the compensation data voltage of the pixel capacitor; 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 of claim 11, wherein, The pixel circuit of the sub-pixel in the display panel is controlled in the target frame, and the pixel capacitor corresponding to the light emitting element in the pixel circuit is charged, and the method comprises the steps of: According to the display data, the initialization voltage is obtained, and in the target frame, the respective corresponding initialization voltage is sent to the initialization signal line of the first sub-pixel and the second sub-pixel in the display panel, so that the pixel circuit of the sub-pixel is compensated and charged according to the initialization voltage of the pixel capacitor; 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.

14. The display driving method according to claim 13, wherein The pixel circuit of the sub-pixel in the display panel is controlled in the target frame, and the pixel capacitor corresponding to the light emitting element in the pixel circuit is charged, and the method comprises the steps of: At least in the target frame, the 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 is turned on in response to the second reset control signal input by the second reset control end. The second initialization end and the first node of the pixel circuit.

15. The display driving method according to claim 14, wherein The second reset control signal is sent to the second reset signal line of the display panel at least in the target frame, which comprises the steps of: In each display frame, the second reset control signal is sent to the second reset signal line of the display panel, so that the second reset module is turned on in response to the second reset control signal, and the second initialization end and the first node are turned on; The sending of the respective corresponding initialization voltages to the initialization signal lines of the first and second sub-pixels in the target frame comprises: In each display frame, the respective corresponding second initialization voltages are sent to the second voltage signal lines of the first and second sub-pixels in the display panel, so that the pixel circuits of the sub-pixels perform compensation charging on the pixel capacitances according to the second initialization voltages.

16. The display driving method of claim 14, wherein, The sending of the second reset control signal to the 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 the first reset control signal is sent 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 time delay.

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