Driving circuit, driving method thereof and display panel

Abstract

The invention discloses a driving circuit, a driving method thereof and a display panel, and the driving circuit comprises a light-emitting element; the driving transistor is connected with the anode of the light-emitting element and is used for controlling current flowing through the light-emitting element; the storage capacitor is connected with the grid electrode of the driving transistor and is used for storing the voltage charged into the grid electrode of the driving transistor; the electric leakage unit is connected with the grid electrode of the driving transistor and the storage capacitor; and the isolation transistor is arranged between the grid electrode of the driving transistor and the electric leakage unit and is used for isolating the grid electrode of the driving transistor and the electric leakage unit in a display stage so as to inhibit the loss of the charges stored on the storage capacitor through the electric leakage unit. Through the circuit, the display stability is improved.

Description

Technical Field

[0001] The present invention relates to the field of display panels, and in particular to a driving circuit and a driving method thereof, and a display panel. Background Art

[0002] As society develops towards informatization, various performance requirements for the display field are constantly increasing. Therefore, it is necessary to research various flat panel display devices that are thin, light and have low power consumption, such as active matrix organic light emitting diodes (OLEDs).

[0003] Among OLED display devices, AMOLED (Active Matrix / Organic Light Emitting Diode) has been widely used in flat panel display devices due to its advantages such as being thinner and lighter, self-luminous, low radiation, high contrast, fast response speed and low energy consumption.

[0004] In existing driving circuits, since the switching transistor is not an ideal device, leakage occurs when the transistor is turned off, thereby affecting the display. Summary of the Invention

[0005] The main technical problem solved by the present application is to provide a driving circuit and a driving method thereof, and a display panel to improve display stability.

[0006] To solve the above problems, the present application provides a driving circuit in a first aspect, wherein the driving circuit includes: a light-emitting element; a driving transistor connected to the anode of the light-emitting element and used to control the current flowing through the light-emitting element; a storage capacitor connected to the gate of the driving transistor and used to store the gate voltage charged to the driving transistor; a leakage unit connected to the gate of the driving transistor and the storage capacitor; an isolation transistor arranged between the gate of the driving transistor and the leakage unit, the isolation transistor having a first path end and a second path end, the first path end of the isolation transistor being connected to the gate of the driving transistor and the storage capacitor, and the second path end of the isolation transistor being connected to the leakage unit, for isolating the gate of the driving transistor from the leakage unit during the display stage, thereby suppressing the charge stored in the storage capacitor from being lost through the leakage unit.

[0007] The driving circuit further includes a first capacitor connected to the second path end of the isolation transistor for maintaining the voltage of the second path end of the isolation transistor, thereby ensuring that the voltage of the second path end of the isolation transistor remains the same as the voltage of the first path end during the display phase, thereby suppressing the loss of charge stored in the storage capacitor.

[0008] The leakage unit includes a data writing unit, which includes: a data transistor having a first path end and a second path end, the first path end of the data transistor being connected to the data line, and the second path end of the data transistor being connected to the second path end of the isolation transistor, and being used to charge the gate of the driving transistor and the storage capacitor through the isolation transistor during a charging phase, and to suppress the charge stored in the storage capacitor from being lost through the data transistor during a display phase.

[0009] The leakage unit includes part of a data writing unit, wherein the data writing unit includes: a data transistor having a first path end and a second path end, the first path end of the data transistor being connected to the data line, and the second path end of the data transistor being connected to the source of the driving transistor; a compensation transistor having a first path end and a second path end, the first path end of the compensation transistor being connected to the drain of the driving transistor, and the second path end of the compensation transistor being connected to the gate of the driving transistor and the storage capacitor; the data writing unit is used to write a gate voltage including a data voltage and a threshold voltage of the driving transistor to the gate of the driving transistor during a charging phase, and maintain the gate voltage through the storage capacitor; the leakage unit includes the compensation transistor, and the isolation transistor is arranged between the gate of the driving transistor and the compensation transistor to suppress the charge stored in the storage capacitor from being lost through the compensation transistor.

[0010] In which, the leakage unit also includes a reset unit, and the reset unit includes a first reset transistor; the first reset transistor is arranged at one end of the isolation transistor away from the driving transistor, and the first reset transistor has a first path end and a second path end, the first path end of the first reset transistor is connected to the first reset signal line, and the second path end is connected to the second path end of the isolation transistor, and is used to charge the reset signal to the gate of the driving transistor and the storage capacitor through the isolation transistor during the reset phase, and to suppress the charge stored in the storage capacitor from being lost through the first reset transistor during the display phase.

[0011] In which, the driving circuit also includes: a first switching transistor, which is arranged between the power line and the source of the driving transistor, and the first switching transistor has a first path end and a second path end, the first path end of the first switching transistor is connected to the power line, and the second path end of the first switching transistor is connected to the source of the driving transistor and the second path end of the data transistor, and is used to control the power line to supply power to the light-emitting element in the display stage.

[0012] In which, the driving circuit also includes: a second switching transistor, which is arranged between the drain of the driving transistor and the light-emitting element, and the second switching transistor has a first path end and a second path end, the first path end of the second switching transistor is connected to the drain of the driving transistor, and the second path end of the second switching transistor is connected to the anode of the light-emitting element, and is used to control the driving transistor to provide a driving current to the light-emitting element in the display stage.

[0013] The driving circuit further includes: a second reset transistor having a first path end and a second path end, the first path end of the second reset transistor being connected to a second reset signal line, and the second path end of the second reset transistor being connected to the anode of the light-emitting element, for providing a reset signal to the anode of the light-emitting element during a reset phase or a charging phase.

[0014] To solve the above problems, the present application provides a driving method for a driving circuit in the second aspect, wherein the driving method for the driving circuit at least includes: in the display stage, the driving transistor provides a driving current to the light-emitting element, and at the same time, the isolation transistor is used to suppress the gate voltage of the driving transistor from leaking through the leakage unit.

[0015] To solve the above problem, the present application provides a display panel in a third aspect, wherein the display panel includes the driving circuit described in any embodiment of the first aspect.

[0016] The beneficial effect of the present application is that by setting an isolation transistor at the gate end of the driving transistor and making the source and drain voltages of the isolation transistor the same, even when other switching transistors are not ideal devices, the storage capacitor leakage problem caused by the switching device being a non-ideal device can be improved, thereby ensuring the stability of the display image and improving the display stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic structural diagram of the first embodiment of the driving circuit provided in this application; Figure 2 A schematic structural diagram of a second embodiment of the driving circuit provided in this application; Figure 3 A schematic structural diagram of a first specific embodiment of a driving circuit provided in this application; Figure 4 A schematic structural diagram of a second specific embodiment of the driving circuit provided in this application; Figure 5 A schematic structural diagram of a third specific embodiment of the driving circuit provided in this application; Figure 6 A timing control diagram of an embodiment of a driving circuit provided in this application; Figure 7 FIG. 1 is a structural diagram of an embodiment of a display panel of the present application.

[0019] Light-emitting element OLED; power line ELVDD; driving transistor DT; storage capacitor Cst; isolation transistor T0; leakage unit 11; data transistor T1; compensation transistor T2; first switch transistor T3; second switch transistor T4; first reset transistor T5; second reset transistor T6; first capacitor C1; data line Data; first reset signal line Vint1; second reset signal line Vint2; display panel 100; light-emitting unit 101. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms. Unless otherwise clearly indicated above, "a plurality" generally includes at least two, but does not exclude the inclusion of at least one.

[0022] It should be understood that the term "and / or" as used herein is merely a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship. The terms "first," "second," etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0023] It should be understood that the terms "comprises," "comprising," or any other variations thereof as used herein are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0024] It should be noted that the first path end and the second path end of the transistor appearing in this application are the source and drain of the transistor respectively, and the control end is the gate of the transistor, wherein the source and drain are not limited, and the first path end can be the source or the second path end can be the source.

[0025] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in every place in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] This application provides a driving circuit. Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the driving circuit provided by this application. Figure 1 As shown, the driving circuit includes a light emitting element OLED, a driving transistor DT, a storage capacitor Cst, a leakage unit 11 and an isolation transistor T0 arranged between the gate of the driving transistor DT and the leakage unit 11 .

[0027] The driving transistor DT is connected to the anode of the light-emitting element OLED and is used to control the current flowing through the light-emitting element OLED. Specifically, the source of the driving transistor DT is connected to the power line ELVDD, the drain of the driving transistor DT is connected to the light-emitting element OLED, and the gate of the driving transistor DT is connected to the leakage unit 11.

[0028] The storage capacitor Cst is connected to the gate of the drive transistor DT and is used to store the voltage charged to the gate of the drive transistor DT. Specifically, the first plate of the storage capacitor Cst is connected to the power line ELVDD, and the second plate is connected to the gate of the drive transistor DT to maintain the gate voltage charged to the drive transistor DT. In other embodiments, the first plate of the storage capacitor Cst can also be connected to another constant current voltage source (such as the low potential voltage source ELVSS), which is not limited here.

[0029] The leakage unit 11 is connected to the gate of the driving transistor DT and the storage capacitor Cst. The leakage unit 11 includes a data writing unit, a portion of the data writing unit, or a reset unit. Before the display phase, the voltage needs to be charged to the gate of the driving transistor DT through the leakage unit 11 and stored through the storage capacitor Cst. Therefore, the leakage unit 11 is an indispensable part of the driving circuit.

[0030] The transistor in the leakage unit 11 is a non-ideal device. As can be seen from the characteristic curves of existing switching transistors, regardless of the gate voltage, the source-drain current of the switching transistor cannot be completely zero, thus causing leakage. Besides the non-ideal nature of the device, another key factor causing leakage is unequal source-drain voltages.

[0031] In this embodiment, because the transistor in the leakage unit 11 is a non-ideal device, when the voltages across the source and drain of the leakage unit 11 are unequal, a small amount of leakage may occur even when the transistor in the leakage unit 11 is in the off state. This is primarily because the voltage at the end of the leakage unit 11 away from the driving transistor DT is lower than the voltage at the gate of the driving transistor DT, causing the gate voltage of the driving transistor DT to leak through the leakage unit 11.

[0032] In order to suppress the gate voltage of the driving transistor DT from leaking through the leakage unit 11, the present application provides an isolation transistor T0 between the gate of the driving transistor DT and the leakage unit 11, thereby suppressing the gate of the driving transistor DT from leaking through the leakage unit 11 through the isolation transistor T0. Specifically, the isolation transistor T0 includes a first path end and a second path end. The first path end of the isolation transistor T0 is connected to the gate of the driving transistor DT and the storage capacitor Cst, and the second path end of the isolation transistor T0 is connected to the leakage unit 11. It is used to isolate the gate of the driving transistor DT from the leakage unit 11 during the display phase, reduce the loss of charge stored in the storage capacitor Cst, improve leakage, and ensure display stability. It should be noted that during the display phase, the transistor in the leakage unit 11 is in the off state.

[0033] In a preferred embodiment, the isolation unit further includes a first capacitor C1. Figure 2 , Figure 2 This is a schematic diagram of the structure of the second embodiment of the driving circuit provided by this application. Figure 2As shown, the first capacitor C1 is connected to the second path terminal of the isolation transistor T0. Specifically, the first plate of the first capacitor C1 is connected to the power line ELVDD, and the second plate is connected to the second path terminal of the isolation transistor T0. This capacitor C1 is used to maintain the voltage charged to the second path terminal of the isolation transistor T0, thereby ensuring that the voltage at the second path terminal of the isolation transistor T0 remains the same as the voltage at the first path terminal for a long time during the display phase. This effectively prevents charge loss from the storage capacitor Cst, thereby reducing leakage of the gate voltage of the driving transistor DT and improving display stability. The first capacitor C1 is used to store the voltage charged to the second path terminal of the isolation transistor T0 during the charging phase. During the charging phase, the isolation transistor T0 is turned on, and the voltage at the first path terminal of the isolation transistor T0 is the same as the voltage at the second path terminal. During the display phase (light-emitting phase), the voltage at the second path terminal of the isolation transistor T0 is maintained by the first capacitor C1, ensuring that the voltage remains the same as the voltage at the first path terminal of the isolation transistor T0 for a long time during the display phase, thereby suppressing leakage of the gate voltage of the driving transistor DT.

[0034] In the first embodiment, the leakage unit 11 includes a data writing unit. Figure 3 , Figure 3 This is a schematic diagram of the structure of the first specific embodiment of the driving circuit provided by this application. Figure 3 As shown, the data writing unit includes a data transistor T1, which has a first channel end and a second channel end. The first channel end is connected to the data line data, and the second channel end is connected to the gate of the driving transistor DT. The data voltage Vdata is directly charged into the gate of the driving transistor DT, and the display grayscale of the light-emitting element OLED is controlled by the data voltage. The charging phase can be sequential with the display phase, or it can be before the display phase.

[0035] Furthermore, the driving circuit may further include a first switching transistor T3, which is disposed between the drain of the driving transistor DT and the light-emitting element OLED and is configured to control the driving circuit to provide a driving signal to the light-emitting element OLED during the display phase and to be disconnected during the charging phase so that the data transistor T1 charges the driving transistor DT with a data voltage. The isolation transistor T0 is turned on during the charging phase and turned off during the display phase.

[0036] In the first embodiment, the gate of the drive transistor DT is isolated from the data transistor T1 by the isolation transistor T0. Even if the data transistor T1 is a non-ideal device, the data transistor T1 will generate a small amount of leakage at the second channel end of the isolation transistor T0. However, due to the isolation (reducing) effect of the isolation transistor T0, the leakage effect of the data transistor T1 on the first channel end of the isolation transistor T0 is relatively small, thereby effectively reducing the leakage of the gate of the drive transistor DT. Furthermore, to further stabilize the potential of the second channel end of the isolation transistor T0, a first capacitor C1 is added between the second channel end of the isolation transistor T0 and the power line ELVDD. This further reduces the potential leakage of the first channel end of the isolation transistor T0, making it suitable for long-term display conditions.

[0037] In the second embodiment, the leakage unit 11 includes a portion of a data writing unit. Figure 4 , Figure 4 This is a schematic diagram of the structure of the second specific embodiment of the driving circuit provided by this application. Figure 4 As shown, the data writing unit includes a data transistor T1 and a compensation transistor T2. The first channel end of the data transistor T1 is connected to the data line Data, and the second channel end of the data transistor T1 is connected to the source of the driving transistor DT. The first channel end of the compensation transistor T2 is connected to the drain of the driving transistor DT, and the second channel end of the compensation transistor T2 is connected to the gate of the driving transistor DT and the second plate of the storage capacitor Cst. During the charging phase, the data line Data writes a gate voltage including the data voltage Vdata and the threshold voltage Vth of the driving transistor DT to the gate of the driving transistor DT through the data transistor T1, the driving transistor DT, and the compensation transistor T2, and maintains it through the storage capacitor Cst, wherein the gate voltage of the driving transistor DT is Vdata+Vth. In this way, a voltage including its threshold voltage is charged to the gate of the driving transistor DT, thereby eliminating the adverse effects caused by the threshold voltage drift during the display phase.

[0038] In the above embodiment, the driving circuit further includes a first switching transistor T3 and a second switching transistor T4. The first switching transistor T3 is disposed between the power line ELVDD and the source of the driving transistor DT. Specifically, the first channel terminal of the first switching transistor T3 is connected to the power line ELVDD, and the second channel terminal of the first switching transistor T3 is connected to the source of the driving transistor DT and the second channel terminal of the data transistor T1, thereby controlling the power line ELVDD to supply power to the light-emitting element OLED. The second switching transistor T4 is disposed between the drain of the driving transistor DT and the light-emitting element OLED. The first channel terminal of the second switching transistor T4 is connected to the drain of the driving transistor DT, and the second channel terminal of the second switching transistor T4 is connected to the anode of the light-emitting element OLED. During the display phase, the control terminals of the first switching transistor T3 and the second switching transistor T4 are connected to the same control signal line, thereby turning on during the display phase, thereby forming a path for the driving transistor DT to drive the light-emitting element OLED to emit light. The first switching transistor T3 and the second switching transistor T4 are disconnected during the charging phase, ensuring that the data writing unit writes the data voltage and threshold voltage to the gate of the driving transistor DT.

[0039] In a second specific embodiment, the driving method includes a charging phase and a display phase, with the charging phase occurring before the display phase. During the charging phase, the first and second switching transistors T3 and T4 are turned off, the data transistor T1 and the compensation transistor T2 are turned on, and the isolation transistor T0 is also turned on. A gate voltage comprising a data voltage Vdata and a threshold voltage Vth of the driving transistor DT is written to the gate of the driving transistor DT via the data line Data, the data transistor T1, the driving transistor DT, the compensation transistor T2, and the isolation transistor T0. During the display phase, the data transistor T1, the compensation transistor T2, and the isolation transistor T0 are turned off, the first and second switching transistors T3 and T4 are turned on, and the driving transistor DT drives the light-emitting element OLED to emit light.

[0040] In a second specific embodiment, leakage unit 11 includes compensation transistor T2. When isolation transistor T0 is not provided, the voltage difference between the first and second path terminals of compensation transistor T2 causes the gate voltage of driving transistor DT to leak through compensation transistor T2. In this embodiment, by providing isolation transistor T0 between the gate of driving transistor DT and compensation transistor T2, the voltage at the second path terminal of isolation transistor T0 can remain the same as the voltage at the first path terminal during a brief display phase, thereby suppressing the charge stored in storage capacitor Cst from being lost through compensation transistor T2. Furthermore, adding first capacitor C1 between the second path terminal of isolation transistor T0 and power line ELVDD can keep the potential of the second path terminal of isolation transistor T0 stable for a longer period of time, thereby further reducing potential leakage at the first path terminal of isolation transistor T0, making it suitable for long-term display conditions.

[0041] In the third embodiment, the leakage unit 11 further includes a reset unit. The reset unit includes a first reset transistor T5. Figure 5 , Figure 5 This is a schematic diagram of the structure of the third specific embodiment of the driving circuit provided by this application. Figure 5 As shown, the driving circuit may further include a first reset transistor T5, which is arranged at an end of the isolation transistor T0 away from the driving transistor DT, a first path end of the first reset transistor T5 being connected to the first reset signal line Vint1, and a second path end of the first reset transistor T5 being connected to the second path end of the isolation transistor T0, for charging a reset signal to the gate of the driving transistor DT and the storage capacitor Cst through the isolation transistor T0 during a reset phase, so that the driving transistor DT is in a conductive state during a charging phase.

[0042] The leakage unit 11 includes a first reset transistor T5 and a compensation transistor T2.

[0043] In a third specific embodiment, the driving method includes a reset phase, a charging phase, and a display phase. During the reset phase, the first reset transistor T5 and the isolation transistor T0 are turned on, and the first reset signal line Vint1 charges a reset signal to the gate of the driving transistor DT. During the charging phase, the data transistor T1, the compensation transistor T2, and the isolation transistor T0 are turned on, and the data line Data writes a gate voltage comprising a data voltage Vdata and a threshold voltage Vth of the driving transistor DT to the gate of the driving transistor DT via the data transistor T1, the driving transistor DT, the compensation transistor T2, and the isolation transistor T0. During the display phase, the first switching transistor T3 and the second switching transistor T4 are turned on, and the driving transistor DT forms a path with the light-emitting element OLED to drive the light-emitting element OLED to emit light.

[0044] In the display stage, the first reset transistor T5 and the compensation transistor T2 are turned off. Since the first reset transistor T5 and the compensation transistor T2 are not ideal devices and the voltages at their source and drain are not equal, a small amount of leakage will occur.

[0045] In the third embodiment, during the charging phase, isolation transistor T0 is turned on. The voltage at the first channel terminal (point d) of isolation transistor T0 is equal to the voltage at the second channel terminal (point c) of isolation transistor T0, and the voltage at the second channel terminal (point c) of isolation transistor T0 is equal to the sum of the data voltage and the threshold voltage. During the initial display phase, the voltage at the second channel terminal (point c) of isolation transistor T0 is the voltage left over from the charging phase, which is equal to the sum of the data voltage and the threshold voltage. Therefore, the voltage at the first channel terminal (point d) and the voltage at the second channel terminal (point c) of isolation transistor T0 are identical, and there is no leakage. Even during the latter part of the display phase, the second channel terminal (point c) of isolation transistor T0 causes a slight leakage through the first reset transistor T5 and compensation transistor T2, and the voltages at the second and first channel terminals of isolation transistor T0 are approximately equal (with a small voltage difference). Therefore, the leakage caused by the first reset transistor T5 and compensation transistor T2 to the first channel terminal of isolation transistor T0 (i.e., the gate of drive transistor DT) is negligible and can be ignored. The isolation transistor T0 thus reduces the leakage effect of the first reset transistor T5 and the compensation transistor T2 on the gate of the drive transistor DT, thereby improving display stability. In a further embodiment, the voltage at the second path terminal (point c) of the isolation transistor T0 is maintained by the first capacitor C1, so that the voltages at the first path terminal (point d) and the second path terminal (point c) of the isolation transistor T0 remain the same for a long time, further improving display stability.

[0046] In any of the above embodiments, the driving circuit further includes a second reset transistor T6, which is connected to the anode of the light-emitting element OLED and is used to reset the anode of the light-emitting element OLED. Specifically, a first path end of the second reset transistor T6 is connected to the second reset signal line Vint2, and a second path end is connected to the anode of the light-emitting element OLED. The second reset transistor T6 is used to provide a reset signal to the anode of the light-emitting element OLED during a reset phase or a charging phase to prevent the light-emitting element OLED from being illuminated secretly.

[0047] The present application also provides a driving method for a driving circuit. Specifically, the driving method includes at least a display phase. During the display phase, a driving transistor provides a driving current to a light-emitting element while an isolation transistor is turned off. The isolation transistor suppresses leakage of current from the gate of the driving transistor through a leakage unit.

[0048] This application also provides a timing diagram of the driving circuit, please refer to Figure 6 , Figure 6This is a timing control diagram of an embodiment of the driving circuit provided by the present application. In which, the thin film transistor is a low potential conduction transistor.

[0049] In a first embodiment, the driving phase of the driving circuit may only include Figure 6 In the charging phase P2 and display phase P3, during the charging phase P2, the data transistor T1 charges the data voltage to the gate of the driving transistor DT through the isolation transistor T0. During the display phase P3, the isolation transistor T0 is turned off, isolating the gate of the driving transistor DT from the data transistor T1 via the isolation transistor T0, thereby preventing leakage of current from the gate of the driving transistor DT through the data transistor T1.

[0050] In a second embodiment, the driving phase of the driving circuit may only include Figure 6 The charging phase P2 and display phase P3 are shown in FIG. During the charging phase P2, the data transistor T1, the compensation transistor T2, and the isolation transistor T0 are turned on. The data line Data writes a gate voltage comprising the data voltage Vdata and the threshold voltage Vth of the drive transistor DT to the gate of the drive transistor DT via the data transistor T1, the drive transistor DT, the compensation transistor T2, and the isolation transistor T0. During the display phase, the drive transistor DT provides a drive current to the light-emitting element, while the isolation transistor T0 is turned off. Leakage from the gate of the drive transistor DT through the compensation transistor T2 is suppressed by the isolation transistor T0.

[0051] In the third embodiment, the driving phase of the driving circuit includes: Figure 6 The reset phase P1, charging phase P2, and display phase P3 are described in detail. In the reset phase P1, the first reset transistor T5 and the second reset transistor T6 are turned on, and the isolation transistor T0 is also turned on. The first reset signal line Vint1 writes a reset voltage to the gate of the driving transistor through the first reset transistor T5 and the isolation transistor T0, and the second reset signal line Vint2 writes a reset signal to the anode of the light-emitting element OLED through the second reset transistor T6. In the charging phase P2, the data transistor T1 and the compensation transistor T2 are turned on, and the isolation transistor T0 is also turned on. The data line Data charges the data voltage Vdata and the threshold voltage Vth of the driving transistor DT to the gate of the driving transistor DT through the data transistor T1, the driving transistor DT, the compensation transistor T2, and the isolation transistor T0. In the display stage P3, the first switching transistor T3 and the second switching transistor T4 are turned on, and the isolation transistor T0 is turned off. The power line ELVDD provides a driving signal to the light-emitting element OLED through the driving transistor DT, driving the light-emitting element OLED to emit light; at the same time, the isolation transistor T0 is turned off, and the isolation transistor T0 suppresses the gate of the driving transistor DT from leaking through the compensation transistor T2 and the first reset transistor T5.

[0052] The present application also provides a display panel, which includes the driving circuit of any of the above embodiments. Figure 7 , Figure 7 This is a schematic diagram of the structure of an embodiment of the display panel of the present application. Figure 7 As shown, the display panel 100 includes a plurality of light-emitting units 101 , and each light-emitting unit 101 includes a light-emitting element and a driving circuit according to any one of the above embodiments.

[0053] The beneficial effect of the present application is that by providing an isolation transistor at the gate end of the driving transistor and making the source and drain voltages of the isolation transistor the same, even when other switching transistors (such as the first reset transistor T5 and the compensation transistor T2) are non-ideal devices, the storage capacitor leakage problem caused by the non-ideal switching devices can be improved, thereby ensuring the stability of the display image and improving the display stability.

[0054] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A driving circuit, characterized in that: The driving circuit comprises: Light emitting element; a driving transistor connected to the anode of the light emitting element and used to control the current flowing through the light emitting element; a storage capacitor connected to the gate of the driving transistor and used for storing a gate voltage charged to the driving transistor; A leakage unit connected to the gate of the driving transistor and the storage capacitor; An isolation transistor is arranged between the gate of the driving transistor and the leakage unit, the isolation transistor has a first path end and a second path end, the first path end of the isolation transistor is connected to the gate of the driving transistor and the storage capacitor, and the second path end of the isolation transistor is connected to the leakage unit, and is used to isolate the gate of the driving transistor from the leakage unit in the display stage, thereby inhibiting the charge stored in the storage capacitor from being lost through the leakage unit.

2. The driving circuit according to claim 1, characterized in that: The driving circuit also includes a first capacitor, which is connected to the second path end of the isolation transistor and is used to maintain the voltage of the second path end of the isolation transistor, so that the voltage of the second path end of the isolation transistor remains the same as the voltage of the first path end during the display stage, thereby suppressing the loss of charge stored in the storage capacitor.

3. The driving circuit according to claim 1 or 2, characterized in that: The leakage unit includes a data writing unit, and the data writing unit includes: A data transistor having a first channel end and a second channel end, wherein the first channel end of the data transistor is connected to the data line, and the second channel end of the data transistor is connected to the second channel end of the isolation transistor, and is used to charge the data voltage to the gate of the driving transistor and the storage capacitor through the isolation transistor during the charging phase, and to suppress the charge stored in the storage capacitor from being lost through the data transistor during the display phase.

4. The driving circuit according to claim 3, characterized in that: The leakage unit includes a portion of a data writing unit, wherein the data writing unit includes: a data transistor having a first channel end and a second channel end, wherein the first channel end of the data transistor is connected to the data line, and the second channel end of the data transistor is connected to the source of the driving transistor; a compensation transistor having a first channel end and a second channel end, wherein the first channel end of the compensation transistor is connected to the drain of the driving transistor, and the second channel end of the compensation transistor is connected to the gate of the driving transistor and the storage capacitor; The data writing unit is used to write a gate voltage including a data voltage and a threshold voltage of the driving transistor to the gate of the driving transistor in a charging phase, and maintain the gate voltage through the storage capacitor; The leakage unit includes the compensation transistor, and the isolation transistor is arranged between the gate of the driving transistor and the compensation transistor to suppress the charge stored in the storage capacitor from being lost through the compensation transistor.

5. The driving circuit according to claim 4, characterized in that: The leakage unit further includes a reset unit, and the reset unit includes a first reset transistor; The first reset transistor is arranged at an end of the isolation transistor away from the driving transistor, and the first reset transistor has a first path end and a second path end. The first path end of the first reset transistor is connected to the first reset signal line, and the second path end is connected to the second path end of the isolation transistor, and is used to charge the reset signal to the gate of the driving transistor and the storage capacitor through the isolation transistor in the reset stage, and to suppress the charge stored in the storage capacitor from being lost through the first reset transistor in the display stage.

6. The driving circuit according to claim 3, characterized in that: The driving circuit further includes: A first switching transistor is arranged between a power line and a source of the driving transistor, the first switching transistor having a first path end and a second path end, the first path end of the first switching transistor being connected to the power line, the second path end of the first switching transistor being connected to the source of the driving transistor and the second path end of the data transistor, and being used for controlling the power line to supply power to the light-emitting element in the display stage.

7. The driving circuit according to claim 6, characterized in that: The driving circuit further includes: A second switching transistor is arranged between the drain of the driving transistor and the light-emitting element. The second switching transistor has a first path end and a second path end. The first path end of the second switching transistor is connected to the drain of the driving transistor, and the second path end of the second switching transistor is connected to the anode of the light-emitting element, and is used to control the driving transistor to provide a driving current to the light-emitting element during the display stage.

8. The driving circuit according to claim 1, characterized in that: The driving circuit further includes: The second reset transistor has a first path end and a second path end, the first path end of the second reset transistor is connected to the second reset signal line, and the second path end of the second reset transistor is connected to the anode of the light-emitting element, and is used to provide a reset signal to the anode of the light-emitting element in a reset stage or a charging stage.

9. A driving method of a driving circuit according to any one of claims 1 to 8, characterized in that: The driving method of the driving circuit at least comprises: In the display stage, the driving transistor provides a driving current to the light emitting element, and at the same time, the gate voltage of the driving transistor is suppressed from leaking through the leakage unit through the isolation transistor.

10. A display panel, characterized in that: The display panel comprises the driving circuit according to any one of claims 1 to 8.

Images