Pixel driving circuit and display panel

Abstract

The embodiment of the invention discloses a pixel driving circuit and a display panel, and belongs to the technical field of display. The pixel driving circuit comprises a light-emitting diode and a 6T1C circuit, a cathode of the light-emitting diode is connected with a first power supply voltage, T1 is a double-gate transistor, a first gate and a second gate of the double-gate transistor are respectively connected with a first scanning signal and a light-emitting switch signal, one end of T1, one end of T2, one end of T3 and one end of T6 are connected with a data voltage, the other end of T1 is connected with an anode of the light-emitting diode, and the other end of T6 is connected with a cathode of the light-emitting diode. The grid electrode of the T3 is connected with a first scanning signal, the grid electrodes of the T4 and the T6 are connected with a second scanning signal, one end of the storage capacitor is connected with the other end of the T3 and the grid electrode of the T2, the other end of the storage capacitor and one end of the T5 are connected with a second power supply voltage, the grid electrode of the T5 is connected with a light-emitting switch signal, and the other ends of the T2, the T5 and the T6 are connected together. According to the embodiment of the invention, the effective light-emitting area of the display area can be increased while the product performance is ensured, so that the resolution is remarkably improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular to a pixel driving circuit and a display panel. Background Art

[0002] OLED (Organic Light-Emitting Diode) is a device that uses a multi-layer organic thin film structure to produce electroluminescence. It is easy to make and only requires a low driving voltage. These main features make OLED very prominent in meeting the application of flat panel displays.

[0003] At present, the pixel driving circuit of OLED display screens generally adopts 7T1C circuit. However, when the effective display area size of the panel is fixed, the 7T1C circuit contains too many transistors, resulting in a smaller effective light-emitting area, which is not conducive to improving the resolution. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to provide a pixel driving circuit and a display panel, aiming to solve the technical problem of how to increase the effective light-emitting area of ​​the display area.

[0005] To achieve the above object, an embodiment of the present application provides a pixel driving circuit, the pixel driving circuit comprising:

[0006] A light emitting diode, wherein a cathode of the light emitting diode is connected to a first power supply voltage;

[0007] a first transistor, wherein a first end of the first transistor is connected to an anode of the light emitting diode, a first gate of the first transistor is connected to a first scanning signal, a second gate of the first transistor is connected to a light emitting switch signal, and a second end of the first transistor is connected to a data voltage;

[0008] a second transistor, a first terminal of the second transistor being connected to the data voltage;

[0009] a storage capacitor, wherein a first end of the storage capacitor is connected to the gate of the second transistor, and a second end of the storage capacitor is connected to a second power supply voltage;

[0010] a third transistor, wherein a first end of the third transistor is connected to the data voltage, a gate of the third transistor is connected to the first scanning signal, and a second end of the third transistor is connected to the first end of the storage capacitor;

[0011] a fourth transistor, wherein a first end of the fourth transistor is connected to the data voltage, a gate of the fourth transistor is connected to the second scan signal, and a second end of the fourth transistor is connected to the second end of the third transistor;

[0012] a fifth transistor, wherein a first end of the fifth transistor is connected to the second power supply voltage, a gate of the fifth transistor is connected to the light-emitting switch signal, and a second end of the fifth transistor is connected to the second end of the second transistor;

[0013] A sixth transistor, wherein a first end of the sixth transistor is connected to the second end of the fifth transistor, a gate of the sixth transistor is connected to the second scanning signal, and a second end of the sixth transistor is connected to the data voltage.

[0014] In one embodiment, the first scanning signal, the second scanning signal, the data voltage and the light-emitting switch signal are used to change the working timing of the pixel driving circuit so that the pixel driving circuit operates in an initialization stage, a compensation stage and a light-emitting stage in sequence.

[0015] In one embodiment, within a first preset time period, the first scanning signal controls the first transistor and the third transistor to be turned on, the second scanning signal controls the fourth transistor and the sixth transistor to be turned off, the light-emitting switch signal controls the fifth transistor to be turned off, and the data voltage is used as an initialization voltage to initialize the storage capacitor, the gate voltage of the second transistor, and the anode of the light-emitting diode, so that the pixel driving circuit operates in the initialization stage.

[0016] In one embodiment, within a second preset time period, the first scanning signal controls the first transistor and the third transistor to be turned off, the second scanning signal controls the fourth transistor and the sixth transistor to be turned on, the light-emitting switch signal controls the fifth transistor to be turned off, and the data voltage charges the storage capacitor through the sixth transistor, the fourth transistor and the second transistor, so that the pixel driving circuit operates in the compensation stage.

[0017] In one embodiment, within a third preset time period, the first scanning signal controls the third transistor to be turned off, the second scanning signal controls the fourth transistor and the sixth transistor to be turned off, the light-emitting switch signal controls the first transistor and the fifth transistor to be turned on, and the second power supply voltage charges the light-emitting diode through the fifth transistor, the second transistor and the first transistor, so that the pixel driving circuit operates in the light-emitting stage.

[0018] In one embodiment, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor and the sixth transistor are P-type transistors.

[0019] In one embodiment, within the first preset period, the first scan signal is at a low level, the second scan signal is at a high level, the light emitting switch signal is at a high level, and the data voltage is at a low level.

[0020] In one embodiment, during the second preset period, the first scan signal is at a high level, the second scan signal is at a low level, the light emitting switch signal is at a high level, and the data voltage is at a high level.

[0021] In one embodiment, within the third preset period, the first scan signal is at a high level, the second scan signal is at a high level, the light emitting switch signal is at a low level, and the data voltage is at a high level.

[0022] In addition, to achieve the above-mentioned purpose, an embodiment of the present application further provides a display panel, which includes the pixel driving circuit as described above.

[0023] The embodiment of the present application provides a pixel driving circuit and a display panel, the pixel driving circuit comprising: a light emitting diode, wherein the cathode of the light emitting diode is connected to a first power supply voltage; a first transistor, wherein the first end of the first transistor is connected to the anode of the light emitting diode, the first gate of the first transistor is connected to a first scanning signal, the second gate of the first transistor is connected to a light-emitting switch signal, and the second end of the first transistor is connected to a data voltage; a second transistor, wherein the first end of the second transistor is connected to the data voltage; a storage capacitor, wherein the first end of the storage capacitor is connected to the gate of the second transistor, and the second end of the storage capacitor is connected to a second power supply voltage; a third transistor, wherein the first end of the third transistor is connected to the data voltage, the gate of the third transistor is connected to the first scanning signal, and the second end of the third transistor is connected to the first end of the storage capacitor; a fourth transistor, wherein the first end of the fourth transistor is connected to the data voltage, the gate of the fourth transistor is connected to the second scanning signal, and the second end of the fourth transistor is connected to the second end of the third transistor; a fifth transistor, wherein the first end of the fifth transistor is connected to the second power supply voltage, the gate of the fifth transistor is connected to the light-emitting switch signal, and the second end of the fifth transistor is connected to the second end of the second transistor; and a sixth transistor, wherein the first end of the sixth transistor is connected to the second end of the fifth transistor, the gate of the sixth transistor is connected to the second scanning signal, and the second end of the sixth transistor is connected to the data voltage. While ensuring product performance, the embodiments of the present application simplify the 7T1C circuit commonly used in the related art. On the basis of not increasing costs and ensuring process feasibility, it can increase the effective light-emitting area of ​​the display area of ​​the display panel using the pixel driving circuit, and has a significant effect on improving the resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a 7T1C circuit involved in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a pixel driving circuit provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of control timing involved in a pixel driving circuit provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of a circuit principle of a pixel driving circuit provided in an embodiment of the present application working in an initialization stage;

[0029] Figure 5 A schematic diagram of a circuit principle of a pixel driving circuit provided in an embodiment of the present application working in a compensation stage;

[0030] Figure 6 A schematic diagram of the circuit principle of a pixel driving circuit provided in an embodiment of the present application working in a light emitting stage.

[0031] Description of Figure Numbers:

[0032] Vint, initialization voltage; OLED, light emitting diode; ELVSS, first power supply voltage;

[0033] T1, first transistor; Gn-1, first scanning signal; EM, light-emitting switch signal;

[0034] Vdata, data voltage; T2, second transistor; Cst, storage capacitor;

[0035] ELVDD, a second power supply voltage; T3, a third transistor; T4, a fourth transistor;

[0036] Gn, second scanning signal; T5, fifth transistor; T6, sixth transistor. DETAILED DESCRIPTION

[0037] In the following description, specific details such as specific system structures, technologies, etc. are proposed for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the embodiments of the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from hindering the description of the embodiments of the present application.

[0038] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0039] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0040] OLED is a device that uses a multi-layer organic thin film structure to generate electroluminescence. It is easy to make and only requires a low driving voltage. These main features make OLED very prominent in the application of flat-panel displays. Compared with LCD (Liquid Crystal Display), OLED display screens have the advantages of being lighter, thinner, brighter, lower power consumption, faster response, higher clarity, better flexibility, and higher luminous efficiency. Therefore, OLED display screens can meet consumers' new demands for display technology. More and more display manufacturers around the world have invested in research and development, greatly promoting the industrialization process of OLED.

[0041] At present, the pixel driving circuit of OLED display screen generally adopts 7T1C circuit, and its structural diagram is as follows: Figure 1 As shown (taking one sub-pixel as an example), when the effective display area size of the panel is fixed, the 7T1C circuit contains too many TFTs (Thin Film Transistors), resulting in a smaller effective light-emitting area, which is not conducive to improving the resolution.

[0042] Based on this, the embodiments of the present application provide a pixel driving circuit and a display panel, which simplifies the process of Figure 1 The 7T1C circuit shown in the figure deletes the signal line used to transmit the initialization voltage Vint, and connects the data voltage Vdata to the Figure 1 The position of the initialization voltage Vint is connected in the middle, and the output timing of Vdata is changed by the data voltage, so that the data voltage Vdata can be used as the initialization voltage in the initialization stage. Figure 1 T1 and T7 in the 7T1C circuit are integrated into a dual-gate TFT. In this way, one signal line and one TFT can be reduced in each sub-pixel, thereby significantly increasing the effective light-emitting area of ​​the display area of ​​the display panel using the pixel driving circuit, and also having a significant effect on improving the resolution, thereby solving the problem that the above-mentioned 7T1C circuit contains too many TFTs, resulting in a smaller effective light-emitting area, which is not conducive to improving the resolution.

[0043] The pixel driving circuit and the display panel provided in the embodiments of the present application are specifically described through the following embodiments. First, the pixel driving circuit in the embodiments of the present application is described.

[0044] The present application embodiment provides a pixel driving circuit, referring to Figure 2 , Figure 2 This is a schematic diagram of the structure of a pixel driving circuit provided in an embodiment of the present application. In this embodiment, the pixel driving circuit includes:

[0045] A light emitting diode OLED, wherein a cathode of the light emitting diode OLED is connected to a first power supply voltage ELVSS;

[0046] A first transistor T1, wherein a first end of the first transistor T1 is connected to an anode of the light emitting diode OLED, a first gate of the first transistor T1 is connected to a first scanning signal Gn-1, a second gate of the first transistor T1 is connected to a light emitting switch signal EM, and a second end of the first transistor T1 is connected to a data voltage Vdata;

[0047] A second transistor T2, a first terminal of the second transistor T2 is connected to a data voltage Vdata;

[0048] A storage capacitor Cst, wherein a first end of the storage capacitor Cst is connected to the gate of the second transistor T2, and a second end of the storage capacitor Cst is connected to the second power supply voltage ELVDD;

[0049] a third transistor T3, wherein a first end of the third transistor T3 is connected to the data voltage Vdata, a gate of the third transistor T3 is connected to the first scanning signal Gn-1, and a second end of the third transistor T3 is connected to the first end of the storage capacitor Cst;

[0050] a fourth transistor T4, wherein a first end of the fourth transistor T4 is connected to the data voltage Vdata, a gate of the fourth transistor T4 is connected to the second scanning signal Gn, and a second end of the fourth transistor T4 is connected to the second end of the third transistor T3;

[0051] A fifth transistor T5, wherein a first end of the fifth transistor T5 is connected to the second power supply voltage ELVDD, a gate of the fifth transistor T5 is connected to the light-emitting switch signal EM, and a second end of the fifth transistor T5 is connected to the second end of the second transistor T2;

[0052] The sixth transistor T6, a first end of the sixth transistor T6 is connected to the second end of the fifth transistor T5, a gate of the sixth transistor T6 is connected to the second scanning signal Gn, and a second end of the sixth transistor T6 is connected to the data voltage Vdata.

[0053] In this embodiment, if Figure 2 The 6T1C circuit shown is a pixel driving circuit for a sub-pixel in the nth row of pixels of the display panel.

[0054] It should be noted that each transistor used in this embodiment can be a TFT (Thin Film Transistor), a field effect transistor or other devices with the same characteristics. Since the source and drain of the transistor used here are symmetrical, the source and drain are interchangeable. In this embodiment, in order to distinguish the two poles of the transistor except the gate, one of the poles is called the source and the other is called the drain. Since the transistor used in this embodiment can include P-type transistors and / or N-type transistors, the P-type transistor is turned on when the gate is at a low level and turned off when the gate is at a high level, and the N-type transistor is turned on when the gate is at a high level and turned off when the gate is at a low level. The source and drain of the P-type transistor and the N-type transistor are opposite. Therefore, in this embodiment, the two levels of each transistor except the gate are named as the first end and the second end, and the specific source and drain are determined by whether the transistor is a P-type transistor or an N-type transistor.

[0055] As an example, in Figure 2 In the structural diagram shown, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 are all P-type transistors. It should be noted that in this embodiment, P-type transistors are only used as examples for explanation, which does not mean that each transistor can only use P-type transistors. If the P-type transistor is replaced with an N-type transistor, the corresponding control signal is swapped between high and low levels (from high level to low level, or from low level to high level). This embodiment does not limit this.

[0056] In the present embodiment, the light emitting diode OLED may be an organic light emitting diode; the first power supply voltage ELVSS is a low voltage (lower than the second power supply voltage ELVDD) for providing a current direction to the light emitting diode OLED; the first transistor T1 is a dual-gate transistor, and its conduction may be controlled by any one of the first scanning signal Gn-1 (the scanning signal of the n-1th row of pixels) and the light emitting switch signal EM. Specifically, when its conduction is controlled by the first scanning signal Gn-1, its function is to enable the data voltage Vdata as the initialization voltage to initialize the anode of the light emitting diode OLED. When its conduction is controlled by the light emitting switch signal EM, its function is to control whether the light emitting diode OLED is lit, which is equivalent to integrating Figure 1 The functions of T1 and T7 are that, when the circuit is not damaged, the current flowing through the light emitting diode OLED must flow through the first transistor T1; the second transistor T2 is used to control the magnitude of the current flowing through the light emitting diode OLED; the third transistor T3 is used to control the potential on the initialization storage capacitor Cst; the fourth transistor T4 is used to compensate the threshold voltage Vth of the second transistor T2; the fifth transistor T5 is used to control when the second power supply voltage ELVDD (a high voltage that provides current to the light emitting diode OLED, higher than the first power supply voltage ELVSS) supplies power to the light emitting diode OLED; the sixth transistor T6 is used to control when the data voltage Vdata charges the storage capacitor Cst.

[0057] The embodiment of the present application provides a pixel driving circuit, which simplifies the 7T1C circuit described above while ensuring product performance, deletes the signal line used to transmit the initialization voltage Vint, connects the data voltage Vdata to the position where the initialization voltage Vint is connected in the 7T1C circuit, changes the output timing of Vdata by the data voltage, so that the data voltage Vdata can be used as the initialization voltage in the initialization stage, and integrates T1 and T7 in the 7T1C circuit into a dual-gate TFT. In this way, one signal line and one TFT can be reduced in each sub-pixel, thereby significantly increasing the effective light-emitting area of ​​the display area of ​​the display panel using the pixel driving circuit, and also has a significant effect on improving the resolution, thereby solving the problem that the 7T1C circuit contains too many TFTs, resulting in a smaller effective light-emitting area, which is not conducive to improving the resolution.

[0058] In some feasible embodiments, the first scanning signal Gn-1, the second scanning signal Gn, the data voltage Vdata and the light-emitting switch signal EM are used to change the working timing of the pixel driving circuit so that the pixel driving circuit operates in the initialization stage, the compensation stage and the light-emitting stage in sequence.

[0059] In this embodiment, in order to control the pixel driving circuit to work in the initialization stage, the compensation stage and the light-emitting stage in sequence, by changing the control timing of the first scanning signal Gn-1, the second scanning signal Gn, the data voltage Vdata and the light-emitting switch signal EM, the pixel driving circuit can be made to work in the initialization stage, the compensation stage and the light-emitting stage in sequence within different preset time periods.

[0060] As an example, Figure 2 Taking the structure schematic diagram shown in FIG. 1 as an example, that is, when all transistors are P-type transistors, the control timing diagram of the first scanning signal Gn-1, the second scanning signal Gn, the data voltage Vdata and the light-emitting switch signal EM is as shown in FIG. Figure 3 As shown, Dn represents the data that needs to be transmitted to the nth row of pixels.

[0061] It can be understood that, since the pixel driving circuit has the above-mentioned three working stages that appear in sequence in time, it can be considered that the three working stages correspond to three continuous time periods, namely the first preset time period, the second preset time period and the third preset time period. The end point of the first preset time period is the starting moment of the second preset time period, and the end point of the second preset time period is the starting moment of the third preset time period. The time span of the first preset time period, the second preset time period and the third preset time period can be determined according to actual display requirements, and this embodiment does not limit this.

[0062] In some feasible embodiments, within a first preset time period, the first scan signal Gn-1 controls the first transistor T1 and the third transistor T3 to be turned on, the second scan signal Gn controls the fourth transistor T4 and the sixth transistor T6 to be turned off, the light-emitting switch signal EM controls the fifth transistor T5 to be turned off, and the data voltage Vdata is used as an initialization voltage to initialize the storage capacitor Cst, the gate voltage of the second transistor T2, and the anode of the light-emitting diode OLED, so that the pixel driving circuit operates in the initialization stage.

[0063] In this embodiment, the on and off states of each transistor can be combined Figure 4 To understand, by Figure 4 It can be seen that when the first transistor T1 and the third transistor T3 are turned on and the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 are turned off, the data voltage Vdata can be provided as an initialization voltage to the first end of the storage capacitor Cst, the gate of the second transistor T2 and the anode of the light emitting diode OLED, thereby completing the initialization of the potential of the storage capacitor Cst, the gate potential of the second transistor T2 and the anode potential of the light emitting diode OLED.

[0064] As an example, combining Figure 3 and Figure 4It can be seen that when all transistors are P-type transistors, in the first preset period, the first scan signal Gn-1 is low level, the second scan signal Gn is high level, the light-emitting switch signal EM is high level, and the data voltage Vdata is low level.

[0065] It can be understood that, when all transistors are N-type transistors, then within the first preset time period, the first scanning signal Gn-1 is at a high level, the second scanning signal Gn is at a low level, the light-emitting switch signal EM is at a low level, and the data voltage Vdata is at a low level, which can also achieve the effect of controlling the first transistor T1 and the third transistor T3 to be turned on, the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 to be turned off, and the data voltage Vdata is used as the initialization voltage to initialize the storage capacitor Cst, the gate voltage of the second transistor T2 and the anode of the light-emitting diode OLED, so that the pixel driving circuit works in the initialization stage.

[0066] In some feasible embodiments, during the second preset time period, the first scanning signal Gn-1 controls the first transistor T1 and the third transistor T3 to be turned off, the second scanning signal Gn controls the fourth transistor T4 and the sixth transistor T6 to be turned on, the light-emitting switch signal EM controls the fifth transistor T5 to be turned off, and the data voltage Vdata charges the storage capacitor Cst through the sixth transistor T6, the fourth transistor T4 and the second transistor T2, so that the pixel driving circuit operates in the compensation stage.

[0067] In this embodiment, the on and off states of each transistor can be combined Figure 5 To understand, by Figure 5 It can be seen that when the first transistor T1, the third transistor T3 and the fifth transistor T5 are turned off and the second transistor T2, the fourth transistor T4 and the sixth transistor T6 are turned on, the data voltage Vdata can charge the storage capacitor Cst through the sixth transistor T6, the fourth transistor T4 and the second transistor T2, and at the same time compensate for the threshold voltage Vth of the second transistor T2.

[0068] As an example, combining Figure 3 and Figure 5 It can be seen that when all transistors are P-type transistors, in the second preset period, the first scan signal Gn-1 is high, the second scan signal Gn is low, the light-emitting switch signal EM is high, and the data voltage Vdata is high.

[0069] It can be understood that, when all transistors are N-type transistors, then in the second preset time period, the first scanning signal Gn-1 is at a low level, the second scanning signal Gn is at a high level, the light-emitting switch signal EM is at a low level, and the data voltage Vdata is at a high level, which can also achieve the effect of controlling the first transistor T1, the third transistor T3 and the fifth transistor T5 to be turned off, the second transistor T2, the fourth transistor T4 and the sixth transistor T6 to be turned on, and the data voltage Vdata charges the storage capacitor Cst through the sixth transistor T6, the fourth transistor T4 and the second transistor T2, so that the pixel driving circuit operates in the compensation stage.

[0070] In some feasible embodiments, within the third preset time period, the first scan signal Gn-1 controls the third transistor T3 to be turned off, the second scan signal Gn controls the fourth transistor T4 and the sixth transistor T6 to be turned off, the light-emitting switch signal EM controls the first transistor T1 and the fifth transistor T5 to be turned on, and the second power supply voltage ELVDD charges the light-emitting diode OLED through the fifth transistor T5, the second transistor T2 and the first transistor T1, so that the pixel driving circuit operates in the light-emitting stage.

[0071] In this embodiment, the on and off states of each transistor can be combined Figure 6 To understand, by Figure 6 It can be seen that when the first transistor T1, the second transistor T2 and the fifth transistor T5 are turned on and the third transistor T3, the fourth transistor T4 and the sixth transistor T6 are turned off, the second power supply voltage ELVDD can charge the light emitting diode OLED through the fifth transistor T5, the second transistor T2 and the first transistor T1, so that the light emitting diode OLED is turned on, and the current passes through the light emitting diode OLED to complete the light emitting action.

[0072] As an example, combining Figure 3 and Figure 6 It can be seen that when all transistors are P-type transistors, in the third preset period, the first scan signal Gn-1 is high level, the second scan signal Gn is high level, the light-emitting switch signal EM is low level, and the data voltage Vdata is high level.

[0073] It can be understood that, when all transistors are N-type transistors, then within the third preset time period, the first scanning signal Gn-1 is at a low level, the second scanning signal Gn is at a low level, the light-emitting switch signal EM is at a high level, and the data voltage Vdata is at a high level, which can also achieve the effect of controlling the first transistor T1, the second transistor T2 and the fifth transistor T5 to be turned on, the third transistor T3, the fourth transistor T4 and the sixth transistor T6 to be turned off, and the second power supply voltage ELVDD charges the light-emitting diode OLED through the fifth transistor T5, the second transistor T2 and the first transistor T1, so that the pixel driving circuit operates in the light-emitting stage.

[0074] In addition, an embodiment of the present application further provides a display panel, which includes the pixel driving circuit provided by the above embodiment.

[0075] As an example, the display panel in this embodiment may be an OLED display panel or other types of display panels.

[0076] As an example, the display panel can be applied to a display device, which can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc.

[0077] The specific structure and working principle of the pixel driving circuit in this embodiment can refer to the above embodiments. Since the display panel proposed in this embodiment adopts all the technical solutions of all the above embodiments and belongs to the same technical concept, this embodiment at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0078] It should be noted that the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0079] The above are only optional embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structures or equivalent process changes made using the contents of the present application specification and drawings under the application concept of the present application, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A pixel driving circuit, characterized in that: The pixel driving circuit comprises: A light emitting diode, wherein a cathode of the light emitting diode is connected to a first power supply voltage; a first transistor, wherein a first end of the first transistor is connected to an anode of the light emitting diode, a first gate of the first transistor is connected to a first scanning signal, a second gate of the first transistor is connected to a light emitting switch signal, and a second end of the first transistor is connected to a data voltage; a second transistor, a first terminal of the second transistor being connected to the data voltage; a storage capacitor, wherein a first end of the storage capacitor is connected to the gate of the second transistor, and a second end of the storage capacitor is connected to a second power supply voltage; a third transistor, wherein a first end of the third transistor is connected to the data voltage, a gate of the third transistor is connected to the first scanning signal, and a second end of the third transistor is connected to the first end of the storage capacitor; a fourth transistor, wherein a first end of the fourth transistor is connected to the data voltage, a gate of the fourth transistor is connected to the second scan signal, and a second end of the fourth transistor is connected to the second end of the third transistor; a fifth transistor, wherein a first end of the fifth transistor is connected to the second power supply voltage, a gate of the fifth transistor is connected to the light-emitting switch signal, and a second end of the fifth transistor is connected to the second end of the second transistor; A sixth transistor, wherein a first end of the sixth transistor is connected to the second end of the fifth transistor, a gate of the sixth transistor is connected to the second scanning signal, and a second end of the sixth transistor is connected to the data voltage.

2. The pixel driving circuit according to claim 1, characterized in that: The first scanning signal, the second scanning signal, the data voltage and the light-emitting switch signal are used to change the working timing of the pixel driving circuit so that the pixel driving circuit works in the initialization stage, the compensation stage and the light-emitting stage in sequence.

3. The pixel driving circuit according to claim 2, characterized in that: During a first preset time period, the first scanning signal controls the first transistor and the third transistor to be turned on, the second scanning signal controls the fourth transistor and the sixth transistor to be turned off, the light-emitting switch signal controls the fifth transistor to be turned off, and the data voltage is used as an initialization voltage to initialize the storage capacitor, the gate voltage of the second transistor, and the anode of the light-emitting diode, so that the pixel driving circuit operates in the initialization stage.

4. The pixel driving circuit according to claim 3, characterized in that: During a second preset time period, the first scanning signal controls the first transistor and the third transistor to be turned off, the second scanning signal controls the fourth transistor and the sixth transistor to be turned on, the light-emitting switch signal controls the fifth transistor to be turned off, and the data voltage charges the storage capacitor through the sixth transistor, the fourth transistor and the second transistor, so that the pixel driving circuit operates in the compensation stage.

5. The pixel driving circuit according to claim 4, characterized in that: During a third preset time period, the first scanning signal controls the third transistor to be turned off, the second scanning signal controls the fourth transistor and the sixth transistor to be turned off, the light-emitting switch signal controls the first transistor and the fifth transistor to be turned on, and the second power supply voltage charges the light-emitting diode through the fifth transistor, the second transistor and the first transistor, so that the pixel driving circuit operates in the light-emitting stage.

6. The pixel driving circuit according to claim 5, characterized in that: The first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor and the sixth transistor are all P-type transistors.

7. The pixel driving circuit according to claim 6, characterized in that: In the first preset period, the first scan signal is at a low level, the second scan signal is at a high level, the light emitting switch signal is at a high level, and the data voltage is at a low level.

8. The pixel driving circuit according to claim 6, wherein: In the second preset period, the first scan signal is at a high level, the second scan signal is at a low level, the light emitting switch signal is at a high level, and the data voltage is at a high level.

9. The pixel driving circuit according to claim 6, characterized in that: In the third preset period, the first scan signal is at a high level, the second scan signal is at a high level, the light emitting switch signal is at a low level, and the data voltage is at a high level.

10. A display panel, characterized in that: The display panel comprises the pixel driving circuit according to any one of claims 1 to 9.

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