Pixel driving circuit, pixel driving method and display panel

Abstract

The present application belongs to the field of display driving technology, and specifically relates to a pixel driving circuit, a pixel driving method and a display panel. The pixel driving circuit includes a first driving transistor, a second driving transistor, a voltage resetting module, a data writing module, a first light-emitting control module and a second light-emitting control module; the voltage in the first driving transistor and the second driving transistor is reset by the voltage resetting module, and the data voltage is written by the data writing module, so that the first driving transistor and the second driving transistor generate corresponding driving currents according to the data voltage and the reference voltage; the first light-emitting control module and the second light-emitting control module respectively control the first light-emitting element and the second light-emitting element to emit light; the pixel driving circuit of the present application can drive two adjacent sub-pixel units simultaneously or in a time-sharing manner, thereby reducing the number of thin-film transistors in the display panel, improving the transmittance of the display panel and reducing the cost of the display panel.

Description

Technical Field

[0001] The present disclosure belongs to the field of display driving technology, and particularly relates to a pixel driving circuit, a pixel driving method and a display panel. Background Art

[0002] OLED (Organic Light-Emitting Diode) display panels have many advantages such as self-luminescence, flexibility, thin thickness, high brightness, low power consumption, fast response, and wide color gamut. They are widely used in electronic products such as televisions, mobile phones, and laptops.

[0003] In an OLED display panel, a sub-pixel unit typically includes a light-emitting element and a pixel driving circuit that drives the light-emitting element to emit light. This increases the number of thin-film transistors in the display panel, reduces the transmittance of the display panel, and increases the cost of the display panel. Summary of the Invention

[0004] The present application provides a pixel driving circuit, a pixel driving method and a display panel to solve the problems of low transmittance and high cost of display panels.

[0005] In a first aspect, the present application provides a pixel driving circuit, which is applied to a pixel unit group of a display panel, wherein the pixel unit group includes a first light-emitting element corresponding to a first sub-pixel and a second light-emitting element corresponding to a second sub-pixel, and the pixel driving circuit includes: a first driving transistor, a second driving transistor, a voltage reset module, a data writing module, a first light-emitting control module, and a second light-emitting control module; the voltage reset module is used to reset the voltage on the control end of the first driving transistor and the control end of the second driving transistor through a reference voltage, and reset the voltage on the first end of the first driving transistor and the first end of the second driving transistor through a driving voltage; the control end of the data writing module is connected to a first scan line, the first end of the data writing module is connected to a data line, and the second end of the data writing module is connected to the first end of the first driving transistor. The first end of the first light-emitting control module is connected to the first control line, the third end of the data writing module is connected to the first end of the second driving transistor, and is used to write the data voltage into the first end of the first driving transistor and the first end of the second driving transistor respectively; the control end of the first light-emitting control module is connected to the first control line, the first end of the first light-emitting control module is connected to the second end of the first driving transistor, and the second end of the first light-emitting control module is connected to the anode of the first light-emitting element, and is used to control the first light-emitting element to emit light according to the driving current output by the first driving transistor; the control end of the second light-emitting control module is connected to the second control line, the first end of the second light-emitting control module is connected to the second end of the second driving transistor, and the second end of the second light-emitting control module is connected to the anode of the second light-emitting element, and is used to control the second light-emitting element to emit light according to the driving current output by the second driving transistor.

[0006] Optionally, the voltage reset module includes: a first reset module, wherein the control end of the first reset module is connected to the second scan line, the first end of the first reset module is connected to the reference voltage output end, and the second end of the first reset module is connected to the control end of the first driving transistor, for resetting the voltage on the control end of the first driving transistor through the reference voltage; a second reset module, wherein the control end of the second reset module is connected to the second scan line, the first end of the second reset module is connected to the reference voltage output end, and the second end of the second reset module is connected to the control end of the second driving transistor, for resetting the voltage on the control end of the second driving transistor through the reference voltage; and a third reset module, wherein the control end of the third reset module is connected to the third control line, the first end of the third reset module is connected to the driving voltage output end, the second end of the third reset module is connected to the first end of the first driving transistor, and the third end of the second reset module is connected to the first end of the second driving transistor, for resetting the voltages on the first end of the first driving transistor and the first end of the second driving transistor through the driving voltage.

[0007] Optionally, the pixel driving circuit further includes: a first compensation module, wherein the control end of the first compensation module is connected to the third scan line, the first end of the first compensation module is connected to the control end of the first driving transistor, and the second end of the first compensation module is connected to the second end of the first driving transistor, for compensating for the threshold voltage of the first driving transistor; and a second compensation module, wherein the control end of the second compensation module is connected to the third scan line, the first end of the second compensation module is connected to the control end of the second driving transistor, and the second end of the second compensation module is connected to the second end of the second driving transistor, for compensating for the threshold voltage of the second driving transistor.

[0008] Optionally, the first reset module includes: a first switching tube and a first capacitor; the control end of the first switching tube is connected to the second scan line, the first end of the first switching tube is connected to the reference voltage output end, and the second end of the first switching tube is connected to the control end of the first driving transistor through a first node; the first end of the first capacitor is connected to the reference voltage output end, and the second end of the first capacitor is connected to the first node; or / and, the second reset module includes: a second switching tube and a second capacitor, the control end of the second switching tube is connected to the second scan line, the first end of the second switching tube is connected to the reference voltage output end, and the second end of the second switching tube is connected to the control end of the second driving transistor through a second node; the first end of the second capacitor is connected to the second node, and the second end of the second capacitor is connected to the second end of the first driving transistor through a third node. Or / and, the third reset module includes: a third switch tube and a fourth switch tube, the control end of the third switch tube is connected to the third control line, the first end of the third switch tube is connected to the drive voltage output end, and the second end of the third switch tube is connected to the first end of the first drive transistor via a fourth node; the control end of the fourth switch tube is connected to the third control line, the first end of the fourth switch tube is connected to the drive voltage output end, and the second end of the fourth switch tube is connected to the first end of the second drive transistor via a fifth node.

[0009] Optionally, the first compensation module includes: a fifth switching tube, wherein the control end of the fifth switching tube is connected to the third scan line, the first end of the fifth switching tube is connected to the first node, and the second end of the fifth switching tube is connected to the third node; or / and, the second compensation module includes a sixth switching tube, wherein the control end of the sixth switching tube is connected to the third scan line, the first end of the sixth switching tube is connected to the second node, and the second end of the sixth switching tube is connected to the second end of the second driving transistor through the sixth node.

[0010] Optionally, the data writing module includes: a seventh switch tube, the control end of the seventh switch tube is connected to the first scan line, the first end of the seventh switch tube is connected to the data line, and the second end of the seventh switch tube is connected to the fourth node; an eighth switch tube, the control end of the eighth switch tube is connected to the first scan line, the first end of the eighth switch tube is connected to the data line, and the second end of the eighth switch tube is connected to the fifth node.

[0011] Optionally, the first light-emitting control module includes: a ninth switch tube, wherein the control end of the ninth switch tube is connected to the first control line, the first end of the ninth switch tube is connected to the second end of the first driving transistor, and the second end of the ninth switch tube is connected to the anode of the first light-emitting element; or / and, the second light-emitting control module includes: a tenth switch tube, wherein the control end of the tenth switch tube is connected to the second control line, the first end of the tenth switch tube is connected to the second end of the second driving transistor, and the second end of the tenth switch tube is connected to the anode of the second light-emitting element; wherein the cathode of the first light-emitting element and the cathode of the second light-emitting element are grounded.

[0012] In a second aspect, the present application provides a pixel driving method for controlling a pixel driving circuit, the driving method comprising: in a voltage reset stage, resetting the voltage on the control end of the first driving transistor and the control end of the second driving transistor to a reference voltage through a voltage reset module, and resetting the voltage on the first end of the first driving transistor and the first end of the second driving transistor to a driving voltage; in a data writing stage, writing the data voltage into the first end of the first driving transistor and the first end of the second driving transistor respectively through a data writing module, so that the first driving transistor generates a first driving current according to the data voltage, and the second driving transistor generates a second driving current according to the data voltage; in a light-emitting stage, controlling the first light-emitting element and the second light-emitting element to emit light in a time-sharing or simultaneous manner respectively through a first light-emitting control module and a second light-emitting control module.

[0013] Optionally, when the pixel driving circuit includes a first compensation module and a second compensation module, before the data writing stage, the pixel driving method also includes: in the compensation stage, compensating the threshold voltage of the first driving transistor by the first compensation module, and compensating the threshold voltage of the second driving transistor by the second compensation module.

[0014] In a third aspect, the present application provides a display panel, which includes: N scan lines, M data lines and M pixel columns; the pixel columns include N rows of pixel unit groups, and the pixel unit groups include a first light-emitting element corresponding to a first sub-pixel, a second light-emitting element corresponding to a second sub-pixel, and a pixel driving circuit; the pixel driving circuit is connected to the scan lines and the data lines, respectively, the first output end of the pixel driving circuit is connected to the anode of the first light-emitting element, and the second output end of the pixel driving circuit is connected to the anode of the second light-emitting element, for driving the first light-emitting element and the second light-emitting element to emit light simultaneously or in time-sharing.

[0015] The technical solution provided by this application has at least the following beneficial effects:

[0016] The present application resets the voltage in the first driving transistor and the second driving transistor through a voltage reset module to avoid voltage residue and improve the display effect of the picture; writes the data voltage through a data writing module, so that the first driving transistor and the second driving transistor generate corresponding driving currents according to the data voltage and the reference voltage; finally, the first light-emitting control module and the second light-emitting control module are used to control the first light-emitting element and the second light-emitting element to emit light in a time-sharing or simultaneous manner; therefore, the pixel driving circuit of the present application can drive two adjacent sub-pixel units simultaneously or in a time-sharing manner, reducing the number of thin-film transistors in the display panel, improving the transmittance of the display panel and reducing the cost of the display panel; in addition, the present application can also realize the alternating display of odd-column sub-pixel units and even-column sub-pixel units of the display screen through the first light-emitting control module and the second light-emitting control module, thereby reducing the power consumption of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0018] Figure 1 FIG2 is a circuit diagram of a pixel driving circuit provided in an embodiment of the present application.

[0019] Figure 2 FIG2 is a flow chart of a pixel driving method provided in an embodiment of the present application.

[0020] Figure 3 The figure shows a control timing diagram provided in an embodiment of the present application.

[0021] Figure 4 FIG2 is a schematic diagram showing the on-off state of a switch tube in a pixel driving circuit during a voltage resetting phase according to an embodiment of the present application.

[0022] Figure 5 FIG2 is a schematic diagram showing the on-off state of a switch tube in a pixel driving circuit during a compensation phase according to an embodiment of the present application.

[0023] Figure 6 FIG2 is a schematic diagram showing the on-off state of a switch tube in a pixel driving circuit during a data writing phase according to an embodiment of the present application.

[0024] Figure 7 The figure shows a schematic diagram of the on and off states of a switch tube in a pixel driving circuit during a light-emitting stage provided by an embodiment of the present application.

[0025] Figure 8 Shown is a schematic diagram of a display panel provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 100. Pixel driving circuit;

[0028] 110, voltage reset module; 111, first reset module; 112, second reset module; 113, third reset module; 120, data write module; 130, first light control module; 140, second light control module; 150, first compensation module; 160, second compensation module;

[0029] S1, first scan line; S2, second scan line; S3, third scan line; EM1, first control line; EM2, second control line; EM3, third control line; Data, data line; N1, first node; N2, second node; N3, third node; N4, fourth node; N5, fifth node; N6, sixth node;

[0030] M1, first driving transistor; M2, second driving transistor; T1, first switching tube; T2, second switching tube; T3, third switching tube; T4, fourth switching tube; T5, fifth switching tube; T6, sixth switching tube; T7, seventh switching tube; T8, eighth switching tube; T9, ninth switching tube; T10, tenth switching tube; C1, first capacitor; C2, second capacitor; L1, first light-emitting element; L2, second light-emitting element. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0032] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0033] The present application is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0034] In a first aspect, the present application provides a pixel driving circuit, specifically including the following embodiments:

[0035] Figure 1 FIG. 1 is a schematic structural diagram of a pixel driving circuit provided in an embodiment of the present application; FIG. Figure 1 As shown, a pixel unit group is applied to a display panel, the pixel unit group includes a first light-emitting element L1 corresponding to a first sub-pixel and a second light-emitting element L2 corresponding to a second sub-pixel, and the pixel driving circuit 100 includes: a first driving transistor M1, a second driving transistor M2, a voltage reset module 110, a data writing module 120, a first light-emitting control module 130 and a second light-emitting control module 140.

[0036] In this embodiment, the voltage reset module 110 is used to reset the voltage on the control end of the first driving transistor M1 and the control end of the second driving transistor M2 through the reference voltage, and reset the voltage on the first end of the first driving transistor M1 and the first end of the second driving transistor M2 through the driving voltage.

[0037] In this embodiment, the control end of the data writing module 120 is connected to the first scan line S1, the first end of the data writing module 120 is connected to the data line Data, the second end of the data writing module 120 is connected to the first end of the first driving transistor M1, and the third end of the data writing module 120 is connected to the first end of the second driving transistor M2, and is used to write the data voltage into the first end of the first driving transistor M1 and the first end of the second driving transistor M2, respectively.

[0038] In this embodiment, the control end of the first light-emitting control module 130 is connected to the first control line EM1, the first end of the first light-emitting control module 130 is connected to the second end of the first driving transistor M1, and the second end of the first light-emitting control module 130 is connected to the anode of the first light-emitting element L1, and is used to control the first light-emitting element L1 to emit light according to the driving current output by the first driving transistor M1.

[0039] In this embodiment, the control end of the second light-emitting control module 140 is connected to the second control line EM2, the first end of the second light-emitting control module 140 is connected to the second end of the second driving transistor M2, and the second end of the second light-emitting control module 140 is connected to the anode of the second light-emitting element L2, and is used to control the second light-emitting element L2 to emit light according to the driving current output by the second driving transistor M2.

[0040] It should be noted that, in this embodiment, the first driving transistor M1 and the second driving transistor M2 may be N-type thin film transistors, and the control end, the first end, and the second end of the first driving transistor M1 may be its gate, source, and drain, respectively; the control end, the first end, and the second end of the second driving transistor M2 may be its gate, source, and drain, respectively. The data voltage outputted by the data line Data in this application is a negative voltage, the reference voltage is a positive voltage, and the driving voltage is a negative voltage. The cathode of the first light-emitting element L1 and the cathode of the second light-emitting element L2 are grounded, respectively.

[0041] The working principle of the pixel driving circuit 100 provided in this embodiment is:

[0042] First, the voltage of the first driving transistor M1 and the second driving transistor M2 is reset by the voltage resetting module 110, so that the control terminal voltage of the first driving transistor M1 is the reference voltage, the first terminal voltage of the first driving transistor M1 is the driving voltage, the control terminal voltage of the second driving transistor M2 is the reference voltage, and the first terminal voltage of the first driving transistor M1 is the driving voltage, so as to avoid the residual voltage of the previous frame image affecting the display effect of the current frame image.

[0043] Secondly, the data voltage on the data line Data is written into the first end of the first driving transistor M1 and the second end of the second driving transistor M2 through the data writing module 120. At this time, the voltage at the first end of the first driving transistor M1 changes from the driving voltage to the data voltage, and the voltage at the first end of the second driving transistor M2 also changes from the driving voltage to the data voltage. In addition, the reference voltage output by the voltage resetting module 110 turns on the first driving transistor M1 and the second driving transistor M2. Therefore, after the data voltage is written, the first driving transistor M1 generates a first driving current according to the data voltage and the reference voltage, and the second driving transistor M2 generates a second driving current according to the data voltage and the reference voltage.

[0044] Then, the first light-emitting element L1 is turned on via the first control line EM1, so that the first drive current output by the first drive transistor M1 drives the first light-emitting element L1 to emit light. Similarly, the second light-emitting element L2 is turned on via the second control line EM2, so that the second drive current output by the second drive transistor M2 drives the second light-emitting element L2 to emit light. It should be noted that the control timing of the first control line EM1 and the second control line EM2 can be the same, that is, the first light-emitting element L1 and the second light-emitting element L2 are driven to emit light simultaneously, so that two adjacent sub-pixels display the same brightness. In addition, the control timing of the first control line EM1 and the second control line EM2 can be different, so that the odd-numbered column sub-pixel units and the even-numbered column sub-pixel units can be alternately displayed in a special screen display, that is, the odd-numbered column sub-pixels are lit while the even-numbered column sub-pixels are not lit, or the odd-numbered column sub-pixels are not lit while the even-numbered column sub-pixels are lit, thereby reducing the power consumption of the display panel. The special screen is a screen with low display quality requirements, such as a solid color screen or a static screen.

[0045] It can be seen that the present application resets the voltage in the first driving transistor M1 and the second driving transistor M2 through the voltage reset module 110 to avoid voltage residue and improve the display effect of the picture; the data voltage is written through the data writing module 120, so that the first driving transistor M1 and the second driving transistor M2 generate corresponding driving currents according to the data voltage and the reference voltage; finally, the first light-emitting control module 130 and the second light-emitting control module 140 are used to control the first light-emitting element L1 and the second light-emitting element L2 to emit light in a time-sharing or simultaneous manner; therefore, the pixel driving circuit 100 of the present application can drive two adjacent sub-pixel units simultaneously or in a time-sharing manner, reducing the number of thin film transistors in the display panel, improving the transmittance of the display panel and reducing the cost of the display panel; in addition, the present application can also realize the alternating display of odd-column sub-pixel units and even-column sub-pixel units of the display screen through the first light-emitting control module 130 and the second light-emitting control module 140, thereby reducing the power consumption of the display panel.

[0046] In one embodiment of the present application, Figure 1 As shown, the voltage reset module 110 includes: a first reset module 111, wherein the control end of the first reset module 111 is connected to the second scan line S2, the first end of the first reset module 111 is connected to the reference voltage output end, and the second end of the first reset module 111 is connected to the control end of the first driving transistor M1, and is used to reset the voltage on the control end of the first driving transistor M1 using the reference voltage;

[0047] Optionally, the first reset module 111 includes: a first switch tube T1 and a first capacitor C1; the control end of the first switch tube T1 is connected to the second scan line S2, the first end of the first switch tube T1 is connected to the reference voltage output end, and the second end of the first switch tube T1 is connected to the control end of the first driving transistor M1 through the first node N1; the first end of the first capacitor C1 is connected to the reference voltage output end, and the second end of the first capacitor C1 is connected to the first node N1.

[0048] It should be noted that when the second scan line S2 outputs a high level, the first switch tube T1 is turned on, the reference voltage output by the reference voltage output terminal resets the voltage on the first node N1, and the reference voltage is stored through the first capacitor C1, wherein the voltage on the first node N1 is equal to the voltage on the control terminal of the first driving transistor M1.

[0049] In one embodiment, the voltage reset module 110 further includes: a second reset module 112, wherein the control end of the second reset module 112 is connected to the second scan line S2, the first end of the second reset module 112 is connected to the reference voltage output end, and the second end of the second reset module 112 is connected to the control end of the second driving transistor M2, and is configured to reset the voltage on the control end of the second driving transistor M2 using the reference voltage.

[0050] Optionally, the second reset module 112 includes: a second switch tube T2 and a second capacitor C2, the control end of the second switch tube T2 is connected to the second scan line S2, the first end of the second switch tube T2 is connected to the reference voltage output end, and the second end of the second switch tube T2 is connected to the control end of the second driving transistor M2 through the second node N2; the first end of the second capacitor C2 is connected to the second node N2, and the second end of the second capacitor C2 is connected to the second end of the first driving transistor M1 through the third node N3.

[0051] It should be noted that the high level output by the second scan line S2 turns on the first switch tube T1 and the second switch tube T2 at the same time, so that the reference voltage simultaneously resets the voltage on the second node N2 and stores it in the second capacitor C2; wherein the voltage on the second node N2 is equal to the voltage on the control end of the second driving transistor M2.

[0052] In one embodiment, the voltage reset module 110 further includes: a third reset module 113, wherein the control terminal of the third reset module 113 is connected to the third control line EM3, the first terminal of the third reset module 113 is connected to the driving voltage output terminal, the second terminal of the third reset module 113 is connected to the first terminal of the first driving transistor M1, and the third terminal of the second reset module 112 is connected to the first terminal of the second driving transistor M2, and is configured to reset the voltages on the first terminal of the first driving transistor M1 and the first terminal of the second driving transistor M2 by the driving voltage; at this time, the voltage V N1 = the voltage V on the second node N2 N2 =reference voltage Vref.

[0053] Optionally, the third reset module 113 includes: a third switch tube T3 and a fourth switch tube T4, where the control end of the third switch tube T3 is connected to the third control line EM3, the first end of the third switch tube T3 is connected to the driving voltage output end, and the second end of the third switch tube T3 is connected to the first end of the first driving transistor M1 through a fourth node N4; the control end of the fourth switch tube T4 is connected to the third control line EM3, the first end of the fourth switch tube T4 is connected to the driving voltage output end, and the second end of the fourth switch tube T4 is connected to the first end of the second driving transistor M2 through a fifth node N5.

[0054] It should be noted that when the third control line EM3 outputs a high level, the third switch tube T3 and the fourth switch tube T4 are turned on at the same time, so that the driving voltage outputted by the driving voltage output terminal resets the fourth node N4 and the fifth node N5 at the same time. At this time, the voltage V N4 = the voltage V at the fifth node N5 N5 = driving voltage Vss; since the reference voltage is greater than the driving voltage, the first driving transistor M1 and the second driving transistor M2 are both turned on, so that the voltage V on the third node N3 N3 = the voltage V at the sixth node N6 N6 = driving voltage Vss.

[0055] It can be seen that the voltages of each node in the voltage reset phase are: V N1 =V N2 =Vref, V N3 =V N4 =V N5 =V N6 =Vss.

[0056] In one embodiment of the present application, Figure 1As shown, the pixel driving circuit 100 also includes: a first compensation module 150 and a second compensation module 160, the control end of the first compensation module 150 is connected to the third scan line S3, the first end of the first compensation module 150 is connected to the control end of the first driving transistor M1, and the second end of the first compensation module 150 is connected to the second end of the first driving transistor M1, for compensating for the threshold voltage of the first driving transistor M1; the control end of the second compensation module 160 is connected to the third scan line S3, the first end of the second compensation module 160 is connected to the control end of the second driving transistor M2, and the second end of the second compensation module 160 is connected to the second end of the second driving transistor M2, for compensating for the threshold voltage of the second driving transistor M2.

[0057] Optionally, the first compensation module 150 includes: a fifth switch tube T5, a control end of the fifth switch tube T5 is connected to the third scan line S3, a first end of the fifth switch tube T5 is connected to the first node N1, and a second end of the fifth switch tube T5 is connected to the third node N3.

[0058] Optionally, the second compensation module 160 includes a sixth switch tube T6, the control end of the sixth switch tube T6 is connected to the third scan line S3, the first end of the sixth switch tube T6 is connected to the second node N2, and the second end of the sixth switch tube T6 is connected to the second end of the second driving transistor M2 through the sixth node N6.

[0059] It should be noted that, from the above embodiment, the voltages of the nodes in the voltage reset phase are: V N1 =V N2 =Vref, V N3 =V N4 =V N5 =V N6 = Vss; When the third scan line S3 outputs a high level, the fifth switch tube T5 and the sixth switch tube T6 are turned on at the same time. Since the reference voltage is stored in the first capacitor C1 and the second capacitor C2, the voltage on the first node N1 and the second node N2 decreases from the reference voltage to the driving voltage during the compensation phase. When V N1 =V N2 =Vss+Vth, the first driving transistor M1 and the second driving transistor M2 are turned off. At this time, V G1 =V G2 =V N1 =V N2 =Vss+Vth; where V G1 represents the gate voltage of the first driving transistor M1, V G2 represents the gate voltage of the second driving transistor M2.

[0060] like Figure 1As shown, the data writing module 120 includes: a seventh switch tube T7 and an eighth switch tube T8; the control end of the seventh switch tube T7 is connected to the first scan line S1, the first end of the seventh switch tube T7 is connected to the data line Data, and the second end of the seventh switch tube T7 is connected to the fourth node N4; the control end of the eighth switch tube T8 is connected to the first scan line S1, the first end of the eighth switch tube T8 is connected to the data line Data, and the second end of the eighth switch tube T8 is connected to the fifth node N5.

[0061] It should be noted that, in the data writing stage, the first scan line S1 outputs a high level, and the seventh switch tube T7 and the eighth switch tube T8 are turned on at the same time. The data voltage output on the data line Data is written into the fourth node N4 and the fifth node N5 through the seventh switch tube T7 and the eighth switch tube T8 respectively. At this time, the voltage V N4 = the voltage V at the fifth node N5 N5 =Data voltage V Data , at this time: V GS -V th =(V G1 -V S1 )-Vth=(Vss+V th )-V Data -V th =Vss-V Data , due to Vss and V Data Both are negative pressure, and V Data The absolute value of V is greater than the absolute value of Vss, so V GS -V th =Vss-V Data >0, the first driving transistor M1 and the second driving transistor M2 are turned on, then:

[0062] I1=I2=k(V GS -V th ) 2 =k(V SS +V th -V Data -V th ) 2 =k(V SS -V Data ) 2

[0063] In the above formula, I1 represents the first driving current, I2 represents the second driving current, and V th represents the threshold voltage of the first driving transistor M1 and the second driving transistor M2; it should be noted that the threshold voltage of the first driving transistor M1 and the threshold voltage of the second driving transistor M2 may be the same or different. This embodiment takes the case where the threshold voltages of the two driving transistors are the same as an example.

[0064] It can be seen from this that the first driving current and the second driving current are determined only by the driving voltage and the data voltage, eliminating the influence of the threshold voltage; therefore, through the first compensation module 150 and the second compensation module 160, the change of the driving current caused by the unevenness and instability of the threshold voltage can be solved, thereby improving the display effect.

[0065] like Figure 1 As shown, the first light-emitting control module 130 includes: a ninth switch tube T9, the control end of the ninth switch tube T9 is connected to the first control line EM1, the first end of the ninth switch tube T9 is connected to the second end of the first driving transistor M1, and the second end of the ninth switch tube T9 is connected to the anode of the first light-emitting element L1.

[0066] Optionally, the second light-emitting control module 140 includes: a tenth switch tube T10, the control end of the tenth switch tube T10 is connected to the second control line EM2, the first end of the tenth switch tube T10 is connected to the second end of the second driving transistor M2, and the second end of the tenth switch tube T10 is connected to the anode of the second light-emitting element L2.

[0067] It should be noted that when the first control line EM1 outputs a high level, the ninth switch transistor T9 is turned on, causing the first drive current output by the first drive transistor M1 to drive the first light-emitting element L1 to emit light. Similarly, when the first and second control lines output a high level, the tenth switch transistor T10 is turned on, causing the second drive current output by the second drive transistor M2 to drive the second light-emitting element L2 to emit light. The signal timing of the first control line EM1 and the second control line EM2 can be configured according to actual application scenarios.

[0068] In a second aspect, this embodiment provides a pixel driving method for controlling the pixel driving circuit 100 of the above embodiment, such as Figure 2 As shown, the driving method provided in this embodiment specifically includes the following steps:

[0069] Step S100: In the voltage resetting phase, the voltage resetting module resets the voltages on the control terminals of the first and second driving transistors to the reference voltages, and resets the voltages on the first terminals of the first and second driving transistors to the driving voltages.

[0070] Step S200 : In the compensation phase, the threshold voltage of the first driving transistor is compensated by the first compensation module, and the threshold voltage of the second driving transistor is compensated by the second compensation module.

[0071] Step S300: In the data writing phase, the data voltage is written into the first end of the first driving transistor and the first end of the second driving transistor respectively through the data writing module, so that the first driving transistor generates a first driving current according to the data voltage, and the second driving transistor generates a second driving current according to the data voltage.

[0072] Step S400: In the light-emitting stage, the first light-emitting element and the second light-emitting element are controlled by the first light-emitting control module and the second light-emitting control module to emit light in a time-sharing or simultaneous manner.

[0073] Combine Figure 1 and Figure 3 As shown, the specific process of the pixel driving method is:

[0074] (1) In the voltage reset phase t1, the second scan line S2 and the third control line EM3 both output high level, and the first switch tube T1, the second switch tube T2, the third switch tube T3, and the fourth switch tube T4 are turned on. At this time, V N1 =V N2 =Vref, V N4 =V N5 =Vss, since the reference voltage Vref is greater than the driving voltage Vss, the first driving transistor M1 and the second driving transistor M2 are also turned on, then the voltages of the nodes in the voltage reset phase are: V N1 =V N2 =Vref, V N3 =V N4 =V N5 =V N6 = Vss, at this time the on / off state of the switch tube in the pixel driving circuit 100 is as follows Figure 4 shown.

[0075] (2) In the compensation phase t2, the third scan line S3 and the third control line EM3 both output a high level, turning on the third switch tube T3, the fourth switch tube T4, the fifth switch tube T5, and the sixth switch tube T6. Since the reference voltage is stored in the first capacitor C1 and the second capacitor C2 during the voltage reset phase t1, the voltage on the first node N1 and the second node N2 decreases from the reference voltage to the driving voltage during the compensation phase. When V N1 =V N2 =Vss+Vth, the first driving transistor M1 and the second driving transistor M2 are turned off, V G1 =V G2 =V N1 =V N2 =Vss+Vth, at this time the on / off state of the switch tube in the pixel driving circuit 100 is as follows Figure 5 shown.

[0076] (3) In the data writing phase t3, the first scan line S1 outputs a high level, and the seventh switch tube T7 and the eighth switch tube T8 are turned on at the same time. The data voltage output on the data line Data is written into the fourth node N4 and the fifth node N5 through the seventh switch tube T7 and the eighth switch tube T8 respectively. At this time, the voltage V N4 = the voltage V at the fifth node N5 N5 =Data voltage V Data , at this time V GS -V th =(V G1 -V S1 )-Vth=(Vss+V th )-V Data -V th =Vss-V Data , due to Vss and V Data Both are negative pressure, and V Data The absolute value of V is greater than the absolute value of Vss, so V GS -V th =Vss-V Data >0, the first driving transistor M1 and the second driving transistor M2 are turned on, then:

[0077] I1=I2=k(V GS -V th ) 2 =k(V SS +V th -V Data -V th ) 2 =k(V SS -V Data ) 2 ; It can be seen from this that the first driving current and the second driving current are determined only by the driving voltage and the data voltage, eliminating the influence of the threshold voltage; Therefore, the first compensation module 150 and the second compensation module 160 can solve the change of the driving current caused by the unevenness and instability of the threshold voltage, thereby improving the display effect. At this time, the on-off state of the switch tube in the pixel driving circuit 100 is as follows Figure 6 shown.

[0078] (4) In the light-emitting stage t4, there are the following situations:

[0079] Case 1: The first control line EM1 and the second control line EM2 output high levels, turning on the ninth switch tube T9 and the tenth switch tube T10 at the same time. The first driving current output by the first driving transistor M1 drives the first light-emitting element L1 to emit light, and the second driving current output by the second driving transistor M2 drives the second light-emitting element L2 to emit light. That is, two adjacent sub-pixels emit light at the same time. At this time, the on-off states of the switches in the pixel driving circuit 100 are as follows: Figure 7 shown.

[0080] Case 2: The first control line EM1 outputs a high level, the second control line EM2 outputs a low level, the ninth switch tube T9 is turned on, the tenth switch tube T10 is turned off, the first driving current output by the first driving transistor M1 drives the first light-emitting element L1 to emit light, and the second light-emitting element L2 is in the off state. It can be regarded as the odd-numbered column sub-pixels emit light, and the even-numbered column sub-pixels do not emit light. Figure 8 shown; among them, Figure 8 The white boxes in the figure represent luminous sub-pixels, the black boxes represent non-luminous sub-pixels, G1, G2 and G3 represent the first row of scan lines, the second row of scan lines and the third row of scan lines, respectively, and each row of scan lines includes the first scan line, the second scan line and the third scan line of the above embodiment; D1, D2, D3 and D4 represent the first data line, the second data line, the third data line and the fourth data line, respectively.

[0081] Case 3: The first control line EM1 outputs a low level, the second control line EM2 outputs a high level, the ninth switch tube T9 is turned off, and the tenth switch tube T10 is turned on, so that the second driving current output by the second driving transistor M2 drives the second light-emitting element L2 to emit light, while the first light-emitting element L1 is in the off state. It can be regarded as the odd-numbered column sub-pixels are non-luminous and the even-numbered column sub-pixels are luminous.

[0082] In a third aspect, this embodiment provides a display panel, which includes: N scan lines, M data lines and M pixel columns; the pixel columns include N rows of pixel unit groups, and the pixel unit groups include a first light-emitting element corresponding to a first sub-pixel, a second light-emitting element corresponding to a second sub-pixel, and a pixel driving circuit; the pixel driving circuit is connected to the scan lines and the data lines, respectively, the first output end of the pixel driving circuit is connected to the anode of the first light-emitting element, and the second output end of the pixel driving circuit is connected to the anode of the second light-emitting element, and is used to drive the first light-emitting element and the second light-emitting element to emit light simultaneously or in time-sharing.

[0083] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0084] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0085] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent application.

Claims

1. A pixel driving circuit, characterized in that: A pixel unit group applied to a display panel, the pixel unit group including a first light-emitting element corresponding to a first sub-pixel and a second light-emitting element corresponding to a second sub-pixel, and the pixel driving circuit including: a first driving transistor, a second driving transistor, a voltage resetting module, a data writing module, a first light emitting control module and a second light emitting control module; The voltage resetting module is configured to reset the voltages on the control terminals of the first driving transistor and the second driving transistor using a reference voltage, and to reset the voltages on the first terminal of the first driving transistor and the first terminal of the second driving transistor using a driving voltage; The control end of the data writing module is connected to the first scan line, the first end of the data writing module is connected to the data line, the second end of the data writing module is connected to the first end of the first driving transistor, and the third end of the data writing module is connected to the first end of the second driving transistor, for writing the data voltage into the first end of the first driving transistor and the first end of the second driving transistor respectively; The control end of the first light emitting control module is connected to the first control line, the first end of the first light emitting control module is connected to the second end of the first driving transistor, and the second end of the first light emitting control module is connected to the anode of the first light emitting element, and is used to control the first light emitting element to emit light according to the driving current output by the first driving transistor; The control end of the second light emitting control module is connected to the second control line, the first end of the second light emitting control module is connected to the second end of the second driving transistor, and the second end of the second light emitting control module is connected to the anode of the second light emitting element, and is used to control the second light emitting element to emit light according to the driving current output by the second driving transistor; Wherein, the voltage reset module includes: a first reset module, wherein a control end of the first reset module is connected to the second scan line, a first end of the first reset module is connected to the reference voltage output end, and a second end of the first reset module is connected to the control end of the first driving transistor, and is configured to reset the voltage on the control end of the first driving transistor using the reference voltage; a second reset module, wherein a control end of the second reset module is connected to the second scan line, a first end of the second reset module is connected to the reference voltage output end, and a second end of the second reset module is connected to the control end of the second driving transistor, and is configured to reset the voltage on the control end of the second driving transistor using the reference voltage; a third reset module, wherein the control end of the third reset module is connected to the third control line, the first end of the third reset module is connected to the driving voltage output end, the second end of the third reset module is connected to the first end of the first driving transistor, and the third end of the second reset module is connected to the first end of the second driving transistor, and is used to reset the voltages on the first end of the first driving transistor and the first end of the second driving transistor by using the driving voltage.

2. The pixel driving circuit according to claim 1, wherein: The pixel driving circuit further includes: a first compensation module, wherein a control end of the first compensation module is connected to the third scan line, a first end of the first compensation module is connected to the control end of the first driving transistor, and a second end of the first compensation module is connected to the second end of the first driving transistor, and is used to compensate for the threshold voltage of the first driving transistor; A second compensation module, wherein the control end of the second compensation module is connected to the third scan line, the first end of the second compensation module is connected to the control end of the second driving transistor, and the second end of the second compensation module is connected to the second end of the second driving transistor, for compensating for the threshold voltage of the second driving transistor.

3. The pixel driving circuit according to claim 2, wherein: The first reset module includes: a first switch tube and a first capacitor; the control end of the first switch tube is connected to the second scan line, the first end of the first switch tube is connected to the reference voltage output end, and the second end of the first switch tube is connected to the control end of the first driving transistor via a first node; the first end of the first capacitor is connected to the reference voltage output end, and the second end of the first capacitor is connected to the first node; Or / and, the second reset module includes: a second switch tube and a second capacitor, the control end of the second switch tube is connected to the second scan line, the first end of the second switch tube is connected to the reference voltage output end, and the second end of the second switch tube is connected to the control end of the second driving transistor via a second node; the first end of the second capacitor is connected to the second node, and the second end of the second capacitor is connected to the second end of the first driving transistor via a third node; Or / and, the third reset module includes: a third switch tube and a fourth switch tube, the control end of the third switch tube is connected to the third control line, the first end of the third switch tube is connected to the drive voltage output end, and the second end of the third switch tube is connected to the first end of the first drive transistor via a fourth node; the control end of the fourth switch tube is connected to the third control line, the first end of the fourth switch tube is connected to the drive voltage output end, and the second end of the fourth switch tube is connected to the first end of the second drive transistor via a fifth node.

4. The pixel driving circuit according to claim 3, wherein: The first compensation module includes: a fifth switch tube, wherein a control terminal of the fifth switch tube is connected to the third scan line, a first terminal of the fifth switch tube is connected to the first node, and a second terminal of the fifth switch tube is connected to the third node; Or / and, the second compensation module includes a sixth switch tube, the control end of the sixth switch tube is connected to the third scan line, the first end of the sixth switch tube is connected to the second node, and the second end of the sixth switch tube is connected to the second end of the second driving transistor through the sixth node.

5. The pixel driving circuit according to claim 3, wherein: The data writing module includes: a seventh switch tube, wherein a control end of the seventh switch tube is connected to the first scan line, a first end of the seventh switch tube is connected to the data line, and a second end of the seventh switch tube is connected to the fourth node; An eighth switch tube, wherein a control end of the eighth switch tube is connected to the first scan line, a first end of the eighth switch tube is connected to the data line, and a second end of the eighth switch tube is connected to the fifth node.

6. The pixel driving circuit according to claim 1, wherein: The first light emitting control module includes: a ninth switch tube, wherein a control end of the ninth switch tube is connected to the first control line, a first end of the ninth switch tube is connected to the second end of the first driving transistor, and a second end of the ninth switch tube is connected to the anode of the first light emitting element; Or / and, the second light-emitting control module includes: a tenth switch tube, a control end of the tenth switch tube is connected to the second control line, a first end of the tenth switch tube is connected to the second end of the second driving transistor, and a second end of the tenth switch tube is connected to the anode of the second light-emitting element; The cathode of the first light emitting element and the cathode of the second light emitting element are grounded.

7. A pixel driving method, characterized in that: Used to control the pixel driving circuit according to any one of claims 1 to 6, the driving method comprising: In the voltage resetting phase, the voltage at the control terminal of the first driving transistor and the control terminal of the second driving transistor is reset to a reference voltage by the voltage resetting module, and the voltage at the first terminal of the first driving transistor and the first terminal of the second driving transistor is reset to a driving voltage; In the data writing phase, a data voltage is written into the first end of the first driving transistor and the first end of the second driving transistor respectively through the data writing module, so that the first driving transistor generates a first driving current according to the data voltage, and the second driving transistor generates a second driving current according to the data voltage; In the light-emitting stage, the first light-emitting element and the second light-emitting element are controlled by the first light-emitting control module and the second light-emitting control module to emit light in a time-sharing or simultaneous manner respectively.

8. The pixel driving method according to claim 7, wherein: When the pixel driving circuit includes a first compensation module and a second compensation module, before the data writing stage, the pixel driving method further includes: In the compensation phase, the threshold voltage of the first driving transistor is compensated by the first compensation module, and the threshold voltage of the second driving transistor is compensated by the second compensation module.

9. A display panel, characterized in that: The display panel includes: N scan lines, M data lines, and M pixel columns; The pixel column includes N rows of pixel unit groups, each pixel unit group including a first light-emitting element corresponding to a first sub-pixel, a second light-emitting element corresponding to a second sub-pixel, and the pixel driving circuit according to any one of claims 1 to 6; The pixel driving circuit is connected to the scan line and the data line respectively, the first output end of the pixel driving circuit is connected to the anode of the first light-emitting element, and the second output end of the pixel driving circuit is connected to the anode of the second light-emitting element, and is used to drive the first light-emitting element and the second light-emitting element to emit light simultaneously or in a time-sharing manner.

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