A pixel driving circuit, display device and driving method

Abstract

The present disclosure relates to the technical field of display, and discloses a pixel driving circuit, a display device and a driving method. The pixel driving circuit comprises: a driving transistor configured to generate a driving current according to a data voltage and a threshold voltage of the driving transistor; a data writing sub-circuit coupled with a gate of the driving transistor and configured to input the data voltage of a data signal end to the gate of the driving transistor in response to a signal of a scanning signal end; a threshold compensation sub-circuit coupled with the driving transistor and configured to provide the threshold voltage of the driving transistor to the gate of the driving transistor in response to a signal of a compensation signal end; and a first light emitting control sub-circuit coupled with the driving transistor and configured to provide the driving current generated by the driving transistor to a light emitting device in response to a signal of a control signal end. The pixel driving circuit can eliminate the influence of oxide characteristics on the current of the pixel circuit, and improve the light emitting stability of the light emitting device in the pixel circuit.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and provides a pixel driving circuit, a display device, and a driving method. Background Technology

[0002] For pixel circuits composed of all-oxide type driving transistors, the driving transistors are sensitive to oxide properties (light, water, oxygen, etc.), which can cause changes in their threshold voltage. Changes in threshold voltage can cause instability in the current of the driving transistor during the light emission process, and the light-emitting devices in the pixel circuit may exhibit phenomena such as flickering. Summary of the Invention

[0003] This disclosure provides a pixel driving circuit, a display device, and a driving method to reduce the impact of threshold voltage changes on the light emission instability of the light-emitting device.

[0004] The specific technical solution provided in this disclosure is as follows:

[0005] In a first aspect, a pixel driving circuit includes: a driving transistor, a light-emitting device, a data writing sub-circuit, a threshold compensation sub-circuit, and a first light-emitting control sub-circuit;

[0006] The driving transistor is configured to generate a driving current based on the data voltage and the threshold voltage of the driving transistor.

[0007] The data writing sub-circuit is coupled to the gate of the driving transistor and is configured to input the data voltage of the data signal terminal to the gate of the driving transistor in response to the signal at the scan signal terminal.

[0008] The threshold compensation sub-circuit is coupled to the driving transistor and is configured to provide the threshold voltage of the driving transistor to the gate of the driving transistor in response to a signal at the compensation signal terminal.

[0009] The first light-emitting control subcircuit is coupled to the driving transistor and is configured to provide the driving current generated by the driving transistor to the light-emitting device in response to a signal at the control signal terminal.

[0010] Optionally, the threshold compensation sub-circuit includes a first switching transistor and a first capacitor;

[0011] The control terminal of the first switching transistor is coupled to the compensation signal terminal, the first terminal of the first switching transistor is coupled to the gate of the driving transistor, and the second terminal of the first switching transistor is coupled to the second terminal of the driving transistor.

[0012] The first terminal of the first capacitor is coupled to the gate of the driving transistor, and the second terminal of the first capacitor is coupled to the second terminal of the driving transistor.

[0013] Optionally, the data writing sub-circuit includes a second switching transistor;

[0014] The control terminal of the second switching transistor is coupled to the scan signal terminal, the first terminal of the second switching transistor is coupled to the data signal terminal, and the second terminal of the second switching transistor is coupled to the gate of the driving transistor.

[0015] Optionally, the first light-emitting control sub-circuit includes a third switching transistor;

[0016] The control terminal of the third switching transistor is coupled to the control signal terminal, the first terminal of the third switching transistor is coupled to the first power supply terminal, and the second terminal of the third switching transistor is coupled to the first terminal of the driving transistor.

[0017] Optionally, it also includes a first reset circuit, which is coupled to the first pole of the driving transistor and provides the signal of the reference signal terminal to the first pole of the driving transistor in response to the signal of the first reset signal terminal.

[0018] Optionally, the first reset circuit includes a fourth switching transistor;

[0019] The control terminal of the fourth switching transistor is coupled to the first reset signal terminal, the first terminal of the fourth switching transistor is coupled to the reference signal terminal, and the second terminal of the fourth switching transistor is coupled to the first terminal of the driving transistor.

[0020] Optionally, it also includes a second reset circuit, which is coupled to the gate of the driving transistor. The second reset circuit is configured to provide an initialization signal from the initialization signal terminal to the gate of the driving transistor in response to a signal from the second reset signal terminal.

[0021] Optionally, the second reset circuit includes a fifth switching transistor;

[0022] The control terminal of the fifth switching transistor is coupled to the second reset signal terminal, the first terminal of the fifth switching transistor is coupled to the initialization signal terminal, and the second terminal of the fifth switching transistor is coupled to the gate of the driving transistor.

[0023] Optionally, the second terminal of the driving transistor is coupled to the light-emitting device and the threshold compensation sub-circuit.

[0024] Optionally, it also includes a second light-emitting control sub-circuit, wherein the second electrode of the driving transistor is coupled to the light-emitting device and the threshold compensation sub-circuit through the second light-emitting control sub-circuit;

[0025] The second light-emitting control sub-circuit is configured to, in response to a signal at the control signal terminal, turn on the second terminal of the driving transistor and the light-emitting device.

[0026] Optionally, the second light-emitting control sub-circuit includes a sixth switching transistor;

[0027] The control terminal of the sixth switching transistor is coupled to the control signal terminal, the first terminal of the sixth switching transistor is coupled to the second terminal of the driving transistor, and the second terminal of the sixth switching transistor is coupled to the light-emitting device.

[0028] Optionally, it also includes a second capacitor, the first terminal of which is coupled to the second terminal of the driving transistor, and the second terminal of which is coupled to a fixed voltage signal terminal, which is either a first power supply terminal or a second power supply terminal.

[0029] Optionally, the driving transistor is a single-gate transistor or a dual-gate transistor;

[0030] When the driving transistor is a dual-gate transistor, the first gate of the driving transistor is coupled to the data writing sub-circuit, and the second gate of the driving transistor is coupled to the second power supply terminal.

[0031] Optionally, the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, and the fifth switching transistor are N-type.

[0032] In a second aspect, a display device includes the pixel driving circuit of any one of the above.

[0033] Thirdly, a driving method for a pixel driving circuit as described in any of the above claims includes:

[0034] The second reset circuit resets the anode of the light-emitting device via the fifth switching transistor and the first switching transistor;

[0035] The data writing sub-circuit responds to the signal at the scan signal terminal by inputting the data voltage at the data signal terminal into the gate of the driving transistor;

[0036] The threshold compensation sub-circuit responds to the signal at the compensation signal terminal by providing the threshold voltage of the driving transistor to the gate of the driving transistor.

[0037] The driving transistor generates a driving current based on the data voltage and the threshold voltage of the driving transistor.

[0038] The first light-emitting control sub-circuit responds to the signal at the control signal terminal by providing the driving current generated by the driving transistor to the light-emitting device.

[0039] The beneficial effects of this disclosure are as follows:

[0040] In summary, this disclosure provides a pixel driving circuit, a display device, and a driving method. The pixel driving circuit includes a driving transistor, a light-emitting device, a data writing sub-circuit, a threshold compensation sub-circuit, and a first light-emitting control sub-circuit. During implementation, the driving transistor is configured to generate a driving current based on the data voltage and the threshold voltage of the driving transistor. The data writing sub-circuit is coupled to the gate of the driving transistor and is configured to input the data voltage of the data signal terminal to the gate of the driving transistor in response to a signal at the scan signal terminal. The threshold compensation sub-circuit is coupled to the driving transistor and is configured to provide the threshold voltage of the driving transistor to the gate of the driving transistor in response to a signal at the compensation signal terminal. The first light-emitting control sub-circuit is coupled to the driving transistor and is configured to provide the driving current generated by the driving transistor to the light-emitting device in response to a signal at the control signal terminal. The above-mentioned pixel driving circuit can eliminate the influence of oxide characteristics on the current of the pixel circuit and improve the light-emitting stability of the light-emitting device in the pixel circuit.

[0041] Other features and advantages of this disclosure will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0043] Figure 1 This is a connection diagram of a pixel driving circuit in an embodiment of the present disclosure;

[0044] Figure 2 This is a circuit connection diagram of the first pixel driving circuit in the embodiments of this disclosure;

[0045] Figure 3 This is a connection diagram of another pixel driving circuit in an embodiment of this disclosure;

[0046] Figure 4 This is a circuit connection diagram of the second pixel driving circuit in the embodiments of this disclosure;

[0047] Figure 5 This is a circuit connection diagram of the third pixel driving circuit in the embodiments of this disclosure;

[0048] Figure 6 This is a circuit connection diagram of the fourth pixel driving circuit in the embodiments of this disclosure;

[0049] Figure 7 This is a circuit connection diagram of the fifth pixel driving circuit in the embodiments of this disclosure;

[0050] Figure 8 This is a circuit connection diagram of the sixth pixel driving circuit in the embodiments of this disclosure;

[0051] Figure 9 This is a timing diagram corresponding to the second pixel driving circuit in the embodiments of this disclosure;

[0052] Figure 10 This is a flowchart of a pixel driving circuit driving method according to an embodiment of the present disclosure. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the technical solutions of this disclosure, and not all embodiments. Based on the embodiments recorded in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the technical solutions of this disclosure.

[0054] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0055] In related technologies, the driving transistor is sensitive to the properties of oxides (light, water, oxygen, etc.), which can cause its threshold voltage to change. The change in threshold voltage can cause the current of the driving transistor to be unstable during the light emission process, and the light-emitting device in the pixel circuit may exhibit phenomena such as flickering.

[0056] The preferred embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0057] See Figure 1 As shown in the embodiment of this disclosure, a pixel driving circuit includes: a driving transistor DT, a light-emitting device LED, a data writing sub-circuit 001, a threshold compensation sub-circuit 002, and a first light-emitting control sub-circuit 003.

[0058] During implementation, the aforementioned driving transistor DT is configured to generate a driving current based on the data voltage and the threshold voltage of the driving transistor DT.

[0059] The aforementioned data writing sub-circuit 001 is coupled to the gate of the driving transistor DT and is configured to input the data voltage of the data signal terminal Vdata into the gate of the driving transistor DT in response to the signal of the scan signal terminal Gate.

[0060] The aforementioned threshold compensation sub-circuit 002 is coupled to the driving transistor DT and is configured to provide the threshold voltage of the driving transistor DT to the gate of the driving transistor DT in response to the signal of the compensation signal terminal CM.

[0061] The aforementioned first light-emitting control sub-circuit 003 is coupled to the driving transistor DT and is configured to provide the driving current generated by the driving transistor DT to the light-emitting device LED in response to the signal of the control signal terminal EM.

[0062] See Figure 2 As shown, the threshold compensation sub-circuit 002 includes a first switching transistor T1 and a first capacitor C1.

[0063] The first switching transistor T1 and Figure 2 The connection relationships between other components are as follows: the control terminal of the first switching transistor T1 is coupled to the compensation signal terminal CM, the first terminal of the first switching transistor T1 is coupled to the gate of the driving transistor DT, and the second terminal of the first switching transistor T1 is coupled to the second terminal of the driving transistor DT.

[0064] During implementation, when the signal at the compensation signal terminal CM is high voltage, the first switching transistor T1 is turned on.

[0065] The first capacitor C1 and Figure 2 The connection relationship between other components is as follows: the first end of the first capacitor C1 is coupled to the gate of the driving transistor DT, and the second end of the first capacitor C1 is coupled to the second terminal of the driving transistor DT.

[0066] During implementation, the first capacitor C1 is used to store the threshold voltage of the driving transistor DT.

[0067] See Figure 2 As shown, the data writing sub-circuit 001 includes a second switching transistor T2.

[0068] The second switching transistor T2 and Figure 2 The connection relationships between other components are as follows: the control terminal of the second switching transistor T2 is coupled to the scan signal terminal Gate, the first terminal of the second switching transistor T2 is coupled to the data signal terminal Vdata, and the second terminal of the second switching transistor T2 is coupled to the gate of the driving transistor DT.

[0069] During implementation, when the signal at the Gate terminal is high voltage, the second switching transistor T2 is turned on, and the signal at the Vdata terminal reaches the first node through the turned-on second switching transistor T2.

[0070] See Figure 2 As shown, the first light-emitting control sub-circuit 003 includes a third switching transistor T3.

[0071] The third switching transistor T3 and Figure 2 The connection relationships between other components are as follows: the control terminal of the third switching transistor T3 is coupled to the control signal terminal EM, the first terminal of the third switching transistor T3 is coupled to the first power supply terminal Vdd, and the second terminal of the third switching transistor T3 is coupled to the first terminal of the driving transistor DT.

[0072] During implementation, when the signal at the control signal terminal EM is high voltage, the third switching transistor T3 is turned on, and the signal at the first power supply terminal Vdd reaches the driving transistor DT through the turned-on third switching transistor T3.

[0073] See Figure 3 As shown, the pixel driving circuit also includes a first reset sub-circuit 004, which is coupled to the first terminal of the driving transistor DT. In response to the signal of the first reset signal terminal Re_1, the reference signal terminal Vref is provided to the first terminal of the driving transistor DT.

[0074] During implementation, the aforementioned first reset sub-circuit 004 is mainly used to reset the third node of the driving transistor DT.

[0075] See Figure 4 As shown, the first reset circuit 004 includes a fourth switching transistor T4.

[0076] The fourth switching transistor T4 and Figure 4 The connection relationships between other components are as follows: the control terminal of the fourth switching transistor T4 is coupled to the first reset signal terminal Re_1, the first terminal of the fourth switching transistor T4 is coupled to the reference signal terminal Vref, and the second terminal of the fourth switching transistor T4 is coupled to the first terminal of the driving transistor DT.

[0077] During implementation, when the signal at the first reset signal terminal Re_1 is high, the fourth switching transistor T4 is turned on, and the signal at the reference signal terminal Vref reaches the third node through the turned-on fourth switching transistor T4.

[0078] See Figure 4As shown, the pixel driving circuit also includes a second reset circuit, which is coupled to the gate of the driving transistor DT. The second reset circuit is configured to provide the initialization signal of the initialization signal terminal Vinit to the gate of the driving transistor DT in response to the signal of the second reset signal terminal Re_2.

[0079] During implementation, the aforementioned second reset sub-circuit 005 is mainly used to reset the first node of the driving transistor DT.

[0080] See Figure 4 As shown, the second reset circuit includes a fifth switching transistor T5.

[0081] The fifth switching transistor T5 and Figure 4 The connection relationships between other components are as follows: the control terminal of the fifth switching transistor T5 is coupled to the second reset signal terminal Re_2, the first terminal of the fifth switching transistor T5 is coupled to the initialization signal terminal Vinit, and the second terminal of the fifth switching transistor T5 is coupled to the gate of the driving transistor DT.

[0082] During implementation, when the signal at the second reset signal terminal Re_2 is high, the fifth switching transistor T5 is turned on, and the signal at the initialization signal terminal Vinit reaches the first node through the turned-on fifth switching transistor T5.

[0083] See Figure 4 As shown, the second terminal of the driving transistor DT is coupled to the light-emitting device LED and the threshold compensation circuit 002.

[0084] See Figure 4 As shown, the pixel driving circuit also includes a second light-emitting control sub-circuit 006, and the second terminal of the driving transistor DT is coupled to the light-emitting device LED and the threshold compensation sub-circuit 002 through the second light-emitting control sub-circuit 006.

[0085] During implementation, the second light-emitting control sub-circuit 006 is configured to, in response to the signal of the control signal terminal EM, turn on the second terminal of the driving transistor DT and the light-emitting device LED.

[0086] See Figure 5 As shown, the second light-emitting control sub-circuit 006 includes a sixth switching transistor T6.

[0087] The sixth switching transistor T6 and Figure 5 The connection relationships between other components are as follows: the control terminal of the sixth switching transistor T6 is coupled to the control signal terminal EM, the first terminal of the sixth switching transistor T6 is coupled to the second terminal of the driving transistor DT, and the second terminal of the sixth switching transistor T6 is coupled to the light-emitting device LED.

[0088] During implementation, when the signal at the control signal terminal EM is high voltage, the sixth switching transistor T6 is turned on. The signal at the first power supply terminal Vdd reaches the light-emitting device LED via the driving transistor DT and the turned-on sixth switching transistor T6. The aforementioned sixth switching transistor T6 can be turned on and off according to a preset PWM waveform, thereby further controlling the on and off of the light-emitting device LED. In other words, to make the LED's luminous current more precise, the aforementioned sixth switching transistor T6 can be set to a PWM waveform.

[0089] See Figure 6 and Figure 7 As shown, the pixel driving circuit also includes a second capacitor C2. The first terminal of the second capacitor C2 is coupled to the second terminal of the driving transistor DT, and the second terminal of the second capacitor C2 is coupled to a fixed voltage signal terminal, which is either the first power supply terminal Vdd or the second power supply terminal Vss.

[0090] The original luminous current of the LED is generated by the data voltage of the data signal terminal Vdata through the first capacitor C1 and the driving transistor DT. After setting the second capacitor C2, the luminous current of the LED is generated by the data voltage of the data signal terminal Vdata through the first capacitor C1, the second capacitor C2 and the driving transistor DT. This makes the luminous current of the LED more delicate during the luminous phase.

[0091] To make the circuit connection more flexible, in some other embodiments, the driving transistor DT is a single-gate transistor or a dual-gate transistor.

[0092] When the driving transistor DT is a single-gate transistor, its connection method in the above pixel driving circuit is as follows: Figure 2 , Figure 4 , Figure 5 , Figure 6 or Figure 7 As shown in any of the figures.

[0093] When the driving transistor DT is a dual-gate transistor, refer to Figure 8 As shown, the first gate of the driving transistor DT is coupled to the data writing sub-circuit 001, and the second gate of the driving transistor DT is coupled to the second power supply terminal Vss.

[0094] When the second gate of the driving transistor DT is coupled to the second power supply terminal Vss, it can block light from the driving transistor DT.

[0095] It should be noted that the polarity of the first, second, third, fourth, and fifth switching transistors mentioned above is N-type.

[0096] See Figure 9 As shown, after introducing the circuit connection of the pixel driving circuit, the working process of the pixel driving circuit will be described in detail below with reference to the timing diagram.

[0097] Timing t1 stage: Re_1 = 1, Re_2 = 1, CM = 1, EM = 0, Gate = 0

[0098] When the first reset signal terminal Re_1 is high, the fourth switching transistor is turned on. The signal at the reference signal terminal Vref reaches the third node N3 via the turned-on fourth switching transistor, and the voltage at the third node N3 is Vref. When the second reset signal terminal Re_2 is high, the fifth switching transistor is turned on. The Vinit signal at the initialization signal terminal reaches the first node N1 via the turned-on fifth switching transistor. Simultaneously, the signal at the compensation signal terminal CM is high, the first switching transistor is turned on, and the Vinit signal at the initialization signal terminal reaches the second node N2 via the first node N1 and the turned-on first switching transistor. Since Vinit is greater than Vref, the gate-source voltage of the driving transistor DT is Vgs = Vinit - Vref, and Vgs is greater than Vth, so the driving transistor DT is turned on.

[0099] Timing t2 stage: Re_1=1, Re_2=1, CM=0, EM=0, Gate=0

[0100] When the first reset signal terminal Re_1 is high, the fourth switching transistor is turned on. The signal from the reference signal terminal reaches the third node N3 via the turned-on fourth switching transistor, and the voltage of the third node N3 is Vref. When the second reset signal terminal Re_2 is high, the fifth switching transistor is turned on. The Vinit signal from the initialization signal terminal reaches the first node N1 via the turned-on fifth switching transistor. Simultaneously, the signal from the compensation signal terminal CM is low, and the first switching transistor is turned off. The signal from the reference signal terminal Vref reaches the second node N2 via the turned-on fourth switching transistor and the turned-on drive transistor, and the voltage of the second node N2 is Vref.

[0101] Timing t3 stage: Re_1 = 0, Re_2 = 1, CM = 0, EM = 1, Gate = 0

[0102] When the first reset signal terminal Re_1 is low, the fourth switching transistor is off. When the second reset signal terminal Re_2 is high, the fifth switching transistor is on. When the compensation signal terminal CM is low, the first switching transistor is off. When the control signal terminal EM is high, the third switching transistor is on. The signal from the first power supply terminal Vdd reaches the second node N2 via the on-state third switching transistor and the driving transistor. During the process of the voltage of the second node N2 changing to VDD, specifically, when the voltage of the second node N2 changes to Vinit-Vth, the driving transistor is off, the gate-source voltage of the driving transistor is reset, and the threshold voltage Vth of the driving transistor is written into the first node N1.

[0103] Timing t4 stage: Re_1 = 0, Re_2 = 0, CM = 0, EM = 0, Gate = 1

[0104] When the first reset signal terminal Re_1 is low, the fourth switching transistor is off. When the second reset signal terminal Re_2 is low, the fifth switching transistor is off. When the compensation signal terminal CM is low, the first switching transistor is off. When the control signal terminal EM is low, the third switching transistor is off. When the scan signal terminal Gate is high, the second switching transistor is on. The data voltage of the data signal terminal Vdata is input to the gate of the driving transistor.

[0105] Timing t5 stage: Re_1=0, Re_2=0, CM=0, EM=1, Gate=0

[0106] When the first reset signal terminal Re_1 is low, the fourth switching transistor is off. When the second reset signal terminal Re_2 is low, the fifth switching transistor is off. When the compensation signal terminal CM is low, the first switching transistor is off. When the control signal terminal EM is high, the third switching transistor is on. The driving transistor is on under the action of the first power supply terminal Vdd. The data voltage at the gate of the driving transistor causes the LED to emit light through the on-state driving transistor. When the scan signal terminal Gate is low, the second switching transistor is off.

[0107] The luminous current of the aforementioned LED is I = 1 / 2k(Vgs - Vth). 2 Formula (1)

[0108] In the above formula (1), k is a constant, Vgs is the gate-source voltage of the driving transistor, and Vth is the threshold voltage of the driving transistor.

[0109] Gate-source voltage of driving transistor

[0110] Vgs=(Vdata-Vinit)*(Coled / C1+Coled)+Vth Formula (2)

[0111] In the above formula (2), Vdata is the data voltage of the data signal terminal, Vinit is the initialization signal of the initialization signal terminal, Coled is the capacitance value of the light-emitting device, C1 is the capacitance value of the first capacitor, and Vth is the threshold voltage of the driving transistor.

[0112] Substituting formula (2) into formula (1), the simplified formula for the luminous current is I = 1 / 2k[(Vdata-Vinit)*(Coled / C1+Coled)+Vth-Vth] 2

[0113] =1 / 2k[(Vdata-Vinit)*(Coled / C1+Coled)] 2

[0114] That is, the formula (3) for the luminous current is obtained.

[0115] I=1 / 2k[(Vdata-Vinit)*(Coled / C1+Coled)] 2 Formula (3)

[0116] As can be seen from the above formula (3), by setting the above pixel driving circuit, the light emission current of the light-emitting device is independent of the threshold voltage Vth of the driving transistor.

[0117] In the above formula (3), k is a constant, Vdata is the data voltage of the data signal terminal, Vinit is the initialization signal of the initialization signal terminal, Coled is the capacitance value of the light-emitting device, and C1 is the capacitance value of the first capacitor.

[0118] Furthermore, after adding the second capacitor mentioned above, the luminous current of the light-emitting device is I = 1 / 2k[(Vdata - Vinit) * (Coled + C2 / C1 + Coled + C2)] 2 Formula (4).

[0119] In the above formula (4), k is a constant, Vdata is the data voltage of the data signal terminal, Vinit is the initialization signal of the initialization signal terminal, Coled is the capacitance value of the light-emitting device, C1 is the capacitance value of the first capacitor, and C2 is the capacitance value of the second capacitor.

[0120] Based on the same inventive concept, this disclosure provides a display device including any of the pixel driving circuits described above.

[0121] In this embodiment of the invention, the display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of the display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting the invention.

[0122] Based on the same inventive concept, this disclosure provides a driving method for a pixel driving circuit, see reference. Figure 10 As shown, it includes:

[0123] Step 200: The second reset circuit resets the anode of the light-emitting device via the fifth switching transistor and the first switching transistor.

[0124] Step 201: The data writing sub-circuit responds to the signal at the scan signal terminal by inputting the data voltage at the data signal terminal into the gate of the driving transistor.

[0125] During implementation, when the signal at the scanning signal terminal is at a high level, the second switching transistor is turned on, and the data voltage at the data signal terminal is input to the gate of the driving transistor through the second switching transistor and the first node.

[0126] Step 202: The threshold compensation sub-circuit responds to the signal at the compensation signal terminal by providing the threshold voltage of the driving transistor to the gate of the driving transistor.

[0127] During implementation, when the signal at the compensation signal terminal is at a high level, the first switching transistor is turned on, and the threshold voltage of the driving transistor is provided to the gate of the driving transistor through the turned-on first switching transistor.

[0128] Step 203: The driving transistor generates a driving current based on the data voltage and the threshold voltage of the driving transistor.

[0129] During implementation, in the light-emitting stage, the driving transistor generates a driving current according to the predetermined current formula data voltage and the threshold voltage of the driving transistor.

[0130] Step 204: The first light-emitting control sub-circuit responds to the signal at the control signal terminal by providing the driving current generated by the driving transistor to the light-emitting device.

[0131] During the light-emitting stage, when the signal at the control signal terminal is high, the third switching transistor is turned on, and the driving current generated by the driving transistor is provided to the light-emitting device.

[0132] In summary, the pixel driving circuit, display device, and driving method provided in this disclosure include a pixel driving circuit comprising a driving transistor, a light-emitting device, a data writing sub-circuit, a threshold compensation sub-circuit, and a first light-emitting control sub-circuit. During implementation, the driving transistor is configured to generate a driving current based on a data voltage and a threshold voltage of the driving transistor. The data writing sub-circuit is coupled to the gate of the driving transistor and configured to input the data voltage of the data signal terminal to the gate of the driving transistor in response to a signal at the scan signal terminal. The threshold compensation sub-circuit is coupled to the driving transistor and configured to provide the threshold voltage of the driving transistor to the gate of the driving transistor in response to a signal at the compensation signal terminal. The first light-emitting control sub-circuit is coupled to the driving transistor and configured to provide the driving current generated by the driving transistor to the light-emitting device in response to a signal at the control signal terminal. This pixel driving circuit configuration eliminates the influence of oxide characteristics on the current of the pixel circuit, improving the light-emitting stability of the light-emitting device in the pixel circuit.

[0133] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program product systems. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product system implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0134] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program product systems according to this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0135] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0136] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0137] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A pixel driving circuit, wherein, Comprise: a drive transistor, a light emitting device, a data writing sub-circuit, a threshold compensation sub-circuit and a first light emitting control sub-circuit; The drive transistor is configured to generate a drive current according to a data voltage and a threshold voltage of the drive transistor; The data writing sub-circuit is coupled with the gate of the drive transistor and is configured to input the data voltage of the data signal end to the gate of the drive transistor in response to the signal of the scan signal end; The threshold compensation sub-circuit is coupled with the drive transistor and is configured to provide the threshold voltage of the drive transistor to the gate of the drive transistor in response to the signal of the compensation signal end, the threshold compensation sub-circuit comprises a first switch transistor and a first capacitor, the control end of the first switch transistor is coupled with the compensation signal end, the first end of the first switch transistor is coupled with the gate of the drive transistor, the second end of the first switch transistor is coupled with the second electrode of the drive transistor, the first end of the first capacitor is coupled with the gate of the drive transistor, and the second end of the first capacitor is coupled with the second electrode of the drive transistor; The first light emitting control sub-circuit is coupled with the drive transistor and is configured to provide the drive current generated by the drive transistor to the light emitting device in response to the signal of the control signal end.

2. The pixel driving circuit of claim 1, wherein, The data writing sub-circuit comprises a second switch transistor; The control end of the second switch transistor is coupled with the scan signal end, the first end of the second switch transistor is coupled with the data signal end, and the second end of the second switch transistor is coupled with the gate of the drive transistor.

3. The pixel driving circuit of claim 2, wherein, The first light emitting control sub-circuit comprises a third switch transistor; The control end of the third switch transistor is coupled with the control signal end, the first end of the third switch transistor is coupled with the first power supply end, and the second end of the third switch transistor is coupled with the first electrode of the drive transistor.

4. The pixel driving circuit of claim 3, wherein, Further comprising a first reset sub-circuit, the first reset sub-circuit is coupled with the first electrode of the drive transistor and is configured to provide the signal of the reference signal end to the first electrode of the drive transistor in response to the signal of the first reset signal end.

5. The pixel driving circuit of claim 4, wherein, The first reset sub-circuit comprises a fourth switch transistor; The control end of the fourth switch transistor is coupled with the first reset signal end, the first end of the fourth switch transistor is coupled with the reference signal end, and the second end of the fourth switch transistor is coupled with the first electrode of the drive transistor.

6. The pixel driving circuit of claim 5, wherein, Further comprising a second reset sub-circuit, the second reset sub-circuit is coupled with the gate of the drive transistor and is configured to provide the initialization signal of the initialization signal end to the gate of the drive transistor in response to the signal of the second reset signal end.

7. The pixel driving circuit of claim 6, wherein, The second reset sub-circuit comprises a fifth switch transistor; The control end of the fifth switch transistor is coupled with the second reset signal end, the first end of the fifth switch transistor is coupled with the initialization signal end, and the second end of the fifth switch transistor is coupled with the gate of the drive transistor.

8. The pixel driving circuit according to any one of claims 1 to 3, wherein The second electrode of the drive transistor is coupled with the light emitting device and the threshold compensation sub-circuit.

9. The pixel driving circuit according to any one of claims 1 to 3, wherein The second light-emitting control sub-circuit is configured to turn on the second electrode of the driving transistor and the light-emitting device in response to a signal of the control signal terminal. The second light-emitting control sub-circuit comprises a sixth switch transistor.

10. The pixel driving circuit of claim 9, wherein, The control terminal of the sixth switch transistor is coupled with the control signal terminal, the first terminal of the sixth switch transistor is coupled with the second electrode of the driving transistor, and the second terminal of the sixth switch transistor is coupled with the light-emitting device. The second capacitor has a first electrode coupled with the second electrode of the driving transistor and a second electrode coupled with a fixed voltage signal terminal.

11. The pixel driving circuit of claim 3, wherein, The driving transistor is a single-gate transistor or a double-gate transistor.

12. The pixel driving circuit of claim 11, wherein, When the driving transistor is a double-gate transistor, the first gate of the driving transistor is coupled with the data writing sub-circuit, and the second gate of the driving transistor is coupled with the second power supply terminal. The first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor and the fifth switch transistor are N-type.

13. The pixel driving circuit of claim 7, wherein, The pixel driving circuit comprises the pixel driving circuit according to any one of claims 1-13.

14. A display device, wherein, The pixel driving circuit comprises:

15. A driving method of the pixel driving circuit according to any one of claims 1 to 13, wherein The second reset sub-circuit resets the anode of the light-emitting device through the fifth switch transistor and the first switch transistor. The data writing sub-circuit inputs a data voltage of the data signal terminal to the gate of the driving transistor in response to a signal of the scanning signal terminal. The threshold compensation sub-circuit provides the threshold voltage of the driving transistor to the gate of the driving transistor in response to a signal of the compensation signal terminal. The driving transistor generates a driving current according to the data voltage and the threshold voltage of the driving transistor. The first light-emitting control sub-circuit provides the driving current generated by the driving transistor to the light-emitting device in response to a signal of the control signal terminal. ​

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