CN112669765B

CN112669765B - Breakpoint self-repairing pixel driving circuit, driving method and display device

Info

Publication number: CN112669765B
Application number: CN202011565709.8A
Authority: CN
Inventors: 胡国锋; 谷其兵; 李秀玲; 陈相逸; 付宝; 高娜娜; 梅洪格; 时凌云
Original assignee: BOE Technology Group Co Ltd; BOE Jingxin Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; BOE Jingxin Technology Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2023-03-07
Anticipated expiration: 2040-12-25
Also published as: CN112669765A

Abstract

A breakpoint self-repairing pixel driving circuit, a driving method and a display device are disclosed. Breakpoint self-repair pixel drive circuit includes: the current driving module, the light-emitting master control module and the breakpoint self-repairing light-emitting device are sequentially connected in series between the first power signal end and the second power signal end; the breakpoint self-repair light emitting device includes: the device comprises a first light-emitting module, a second light-emitting module and a light-emitting switching control module; the light-emitting switching control module is configured to provide a current signal to the second light-emitting module to control the second light-emitting module to emit light in a light-emitting stage of a first state, and provide a current signal to the first light-emitting module to control the first light-emitting module to emit light in a light-emitting stage of a second state; the first state is a state when the second light-emitting module is connected normally, and the second state is a state when the second light-emitting module has a breakpoint fault. The breakpoint self-repairing pixel driving circuit provided by the invention can avoid the condition that the pixel unit is scrapped or repaired because of the breakpoint fault of the light-emitting device.

Description

Breakpoint self-repairing pixel driving circuit, driving method and display device

Technical Field

The present disclosure relates to, but not limited to, the field of display technologies, and in particular, to a breakpoint self-repairing pixel driving circuit, a driving method, and a display device.

Background

With the advancement of technology, consumer demand for display products is increasing. Taking a mobile phone as an example, most high-end mobile phones generally adopt an OLED (Organic Light-Emitting Diode) Display screen to replace a traditional LCD (Liquid Crystal Display) screen at present, the main reason is that the LCD product cannot self-illuminate, and Display needs to be realized by means of external backlight, and power consumption is increased due to low transmittance of the Liquid Crystal panel and low utilization rate of a Light source. Meanwhile, the problems of low color gamut, large response time and the like exist.

As a new generation product, OLED can self-emit light, which can effectively solve some problems of LCD, but as an organic light emitting source, the OLED has aging problem, which causes the reduction of service life. The Mini/Micro LED (Light-Emitting Diode) as the next generation display product belongs to inorganic materials, and can greatly prolong the display life, but the device process needs to be transferred to a substrate, so that the current process level cannot achieve extremely high yield, and the problem of bad points is inevitably brought.

Disclosure of Invention

In a first aspect, an embodiment of the present disclosure provides a breakpoint self-repair pixel driving circuit, including: the current driving module, the light-emitting master control module and the breakpoint self-repairing light-emitting device are sequentially connected in series between the first power signal end and the second power signal end; the breakpoint self-repair light emitting device includes: the device comprises a first light-emitting module, a second light-emitting module and a light-emitting switching control module;

the current driving module is respectively connected with the first power signal end and the light-emitting master control module, and is configured to convert the display data signal into a current signal and output the current signal to the light-emitting master control module;

the light-emitting master control module is respectively connected with the current driving module and the breakpoint self-repairing light-emitting device and is configured to output the current signal to the breakpoint self-repairing light-emitting device in a light-emitting stage;

the first light-emitting module is respectively connected with the light-emitting master control module, the second light-emitting module and the light-emitting switching control module and is configured to emit light in a light-emitting stage in a second state; the second state is a state when the second light-emitting module has a breakpoint fault;

the second light-emitting module is respectively connected with the first light-emitting module, the light-emitting switching control module and the second power signal end and is configured to emit light in a light-emitting stage in a first state; the first state is a state when the second light-emitting module is normally connected;

and the light emitting switching control module is respectively connected with the light emitting master control module, the first light emitting module, the second light emitting module and the second power signal end and is configured to provide a current signal to the second light emitting module in the light emitting stage of the first state and provide a current signal to the first light emitting module in the light emitting stage of the second state.

In a second aspect, an embodiment of the present disclosure provides a driving method of a breakpoint self-repair pixel driving circuit, including the following steps:

the current driving module converts the display data signal into a current signal and outputs the current signal to the light-emitting master control module;

the light-emitting master control module outputs the current signal to the breakpoint self-repairing light-emitting device in a light-emitting stage;

the light emitting switching control module provides a current signal to the second light emitting module to control the second light emitting module to emit light in a light emitting stage of a first state, and provides a current signal to the first light emitting module to control the first light emitting module to emit light in a light emitting stage of a second state; the first state is a state when the second light-emitting module is connected normally, and the second state is a state when the second light-emitting module has a breakpoint fault.

In a third aspect, embodiments of the present disclosure provide a display device including the above breakpoint self-repairing pixel driving circuit.

The breakpoint self-repairing pixel driving circuit comprises a breakpoint self-repairing light-emitting device connected in series between a light-emitting master control module and a second power signal end, and the breakpoint self-repairing light-emitting device comprises a first light-emitting module, a second light-emitting module and a light-emitting switching control module. The light emitting switching control module provides a current signal to the second light emitting module when the second light emitting module is connected normally, and drives the second light emitting module to emit light. The light-emitting switching control module provides a current signal for the first light-emitting module when the second light-emitting module has a breakpoint fault, and drives the first light-emitting module to emit light, so that the breakpoint fault of the second light-emitting module is automatically repaired, and the pixel unit is prevented from being scrapped or repaired due to the breakpoint fault of the light-emitting device.

Drawings

The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

Fig. 1 is a schematic structural diagram of a breakpoint self-repair pixel driving circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a detailed structure of the break point self-healing light emitting device of FIG. 1;

FIG. 3 is a schematic diagram illustrating an equivalent circuit of one embodiment of the breakpoint self-repair light emitting device provided in FIG. 2;

FIG. 4 is a schematic diagram of an equivalent circuit of a breakpoint self-repair pixel driving circuit;

FIG. 5 is a timing diagram of signals of the pixel driving circuit shown in FIG. 4 in a first state (the second light-emitting module is normally connected);

fig. 6 is a signal timing diagram of the pixel driving circuit provided in fig. 4 in a second state (a breakpoint fault occurs in the second light emitting module);

fig. 7 is a schematic diagram of a driving method of a self-repair pixel driving circuit according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the manner and content may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.

The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.

In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

In this specification, a transistor refers to an element including at least three terminals, that is, a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, a channel region refers to a region where current mainly flows.

In this specification, the first electrode may be a drain electrode and the second electrode may be a source electrode, or the first electrode may be a source electrode and the second electrode may be a drain electrode. In the case of using transistors of opposite polarities, or in the case where the direction of current flow during circuit operation changes, the functions of the "source electrode" and the "drain electrode" may be interchanged. Therefore, in this specification, "source electrode" and "drain electrode" may be exchanged with each other.

In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some kind of electrical action. The "element having some kind of electrical function" is not particularly limited as long as it can transmit and receive an electrical signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.

The transistors used in the embodiments of the present disclosure may be thin film transistors or field effect transistors or other devices with the same characteristics. Since the source and drain of the thin film transistor used herein are symmetrical, the source and drain can be interchanged. In the embodiments of the present disclosure, one of the source and the drain is referred to as a first pole, and the other of the source and the drain is referred to as a second pole. The active level signal is a gate electrode control signal that can turn on the transistor, and the inactive level signal is a gate electrode control signal that cannot turn on the transistor.

Further, in the description of the embodiments of the present disclosure, the terms "first level" and "second level" are used only to distinguish that the amplitudes of the two levels are different. When the transistor is exemplified as a P-type thin film transistor, the signal level at which the trigger transistor is turned on is a low level, and when the transistor is exemplified as an N-type thin film transistor, the signal level at which the trigger transistor is turned on is a high level.

The embodiment of the present disclosure provides a breakpoint self-repair pixel driving circuit, and fig. 1 is a schematic structural diagram of the breakpoint self-repair pixel driving circuit provided by the embodiment of the present disclosure, as shown in fig. 1, the breakpoint self-repair pixel driving circuit provided by the embodiment of the present disclosure includes: the current driving module, the light emitting master control module and the breakpoint self-repairing light emitting device are sequentially connected in series between a first power signal end VDD and a second power signal end VSS; the breakpoint self-repair light emitting device includes: the device comprises a first light-emitting module, a second light-emitting module and a light-emitting switching control module;

The breakpoint self-repairing pixel driving circuit provided by the above embodiment includes a breakpoint self-repairing light emitting device connected in series between the light emitting main control module and the second power signal terminal, where the breakpoint self-repairing light emitting device includes a first light emitting module, a second light emitting module, and a light emitting switching control module. The light emitting switching control module provides a current signal to the second light emitting module when the second light emitting module is connected normally, and drives the second light emitting module to emit light. The light-emitting switching control module provides a current signal for the first light-emitting module when the second light-emitting module has a breakpoint fault, and drives the first light-emitting module to emit light, so that the breakpoint fault of the second light-emitting module is automatically repaired, and the pixel unit is prevented from being scrapped or repaired due to the breakpoint fault of the light-emitting device.

When the second light-emitting module breaks down, the connection between the second light-emitting module and the first light-emitting module and/or the connection between the second light-emitting module and the second power signal end is interrupted.

Fig. 2 is a detailed structural schematic diagram of a breakpoint self-repairing light-emitting device provided in an embodiment of the present disclosure. In some exemplary embodiments, the first light emitting module includes a first light emitting device, the second light emitting module includes a second light emitting device, and the light emission switching control module includes: the device comprises a first switch unit, a second switch unit, a first connection control unit, a second connection control unit, a first initialization unit, a second initialization unit and an energy storage unit;

the first light-emitting device is respectively connected with the light-emitting master control module and the node C and is configured to emit light in a light-emitting stage in a second state;

the second light-emitting device is respectively connected with the node C and the second power signal end and is configured to emit light in a light-emitting stage in a first state;

the first switch unit is respectively connected with the node B, the light-emitting master control module and the node C, and is configured to be switched on in a data writing stage and a light-emitting stage of a first state, switched on in a data writing stage of a second state and switched off in the light-emitting stage of the second state;

the second switch unit is respectively connected with the node B, the node C and the second power signal end and is configured to be disconnected in a data writing stage and a light-emitting stage of a first state, disconnected in the data writing stage of a second state and connected in the light-emitting stage of the second state;

a first connection control unit connected to the node B, the node C, and the node a, respectively, and configured to be turned on at a data writing stage and a light emitting stage of a first state, turned on at a data writing stage of a second state, and turned off at a light emitting stage of the second state;

a second connection control unit respectively connected with the reset control signal terminal RE, the node a and the initialization signal terminal VINI, and configured to provide a signal of the initialization signal terminal to the node a under the signal control of the reset control signal terminal in the light emitting stages of the first state and the second state;

the first initialization unit is respectively connected with the reset control signal end RE, the node A and the reference signal end VREF and is configured to provide a signal of the reference signal end to the node A under the control of a signal of the reset control signal end in the data writing stage of the first state and the second state;

a second initialization unit respectively connected to the reset control signal terminal RE, the node B, and the initialization signal terminal VINI, and configured to provide a signal of the initialization signal terminal to the node B under the control of a signal of the reset control signal terminal in the data write stage of the first state and the second state;

and the energy storage unit is respectively connected with the node B and the node A and is configured to store the voltage difference information between the node A and the node B.

In the breakpoint self-repairing light emitting device provided in the above embodiment, in the data writing stage, the first initialization unit provides a signal at the reference signal end to the node a, so that the node a is reset; the second initialization unit provides the signal of the initialization signal terminal to the node B, so that the node B is reset; the energy storage unit stores information of a voltage difference between the node a and the node B. In the light emitting stage in the first state, the second connection control unit provides a signal of the initialization signal end to the node A, the first connection control unit provides a voltage signal of the node C to the node A, the potential of the node A changes and influences the potential of the node B through the energy storage unit, so that the first switch unit is kept on and the second switch unit is kept off, the second light emitting device emits light, and the first light emitting device does not emit light. In the light emitting stage in the second state, the second connection control unit provides a signal of the initialization signal end to the node A, the potential of the node A changes and influences the potential of the node B through the energy storage unit, so that the first switch unit is switched from on to off and the second switch unit is switched from off to on, the second light emitting device does not emit light, and the first light emitting device replaces the second light emitting device to emit light. When the second light-emitting module has a breakpoint fault, the first light-emitting module replaces the second light-emitting module to emit light, and therefore breakpoint self-repairing of the pixel unit is achieved.

In some exemplary real-time modes, the light emitting device includes: a Light Emitting Diode (LED);

wherein, the emitting diode includes: an OLED (Organic Light-Emitting Diode), a Mini LED, or a Micro LED.

Fig. 3 is an equivalent circuit schematic diagram of the breakpoint self-repairing light-emitting device shown in fig. 2. In some exemplary embodiments:

the first end of the first light-emitting device D1 is connected with a light-emitting master control module, and the second end of the first light-emitting device is connected with a node C;

a first end of the second light emitting device D2 is connected to a node C, and a second end of the second light emitting device is connected to a second power signal end;

the first switch unit comprises a transistor T1, a control electrode of the transistor T1 is connected with a node B, a first electrode of the transistor T1 is connected with the light-emitting master control module, and a second electrode of the transistor T1 is connected with a node C;

the second switch unit comprises a transistor T2, a control electrode of the transistor T2 is connected with a node B, a first electrode of the transistor T2 is connected with a node C, and a second electrode of the transistor T2 is connected with a second power supply signal end;

the first connection control unit comprises a transistor T3, wherein a control electrode of the transistor T3 is connected with a node B, a first electrode of the transistor T3 is connected with a node C, and a second electrode of the transistor T3 is connected with a node A;

the second connection control unit comprises a transistor T4, a control electrode of the transistor T4 is connected with a reset control signal end, a first electrode of the transistor T4 is connected with a node A, and a second electrode of the transistor T3 is connected with an initialization signal end;

the first initialization unit comprises a transistor T5, wherein a control electrode of the transistor T5 is connected with a reset control signal end, a first electrode of the transistor T5 is connected with a node A, and a second electrode of the transistor T5 is connected with a reference signal end;

the second initialization unit comprises a transistor T6, wherein a control electrode of the transistor T6 is connected with a reset control signal end, a first electrode of a transistor T5 is connected with a node B, and a second electrode of the transistor T5 is connected with an initialization signal end;

the energy storage unit comprises a first capacitor C1, a first end of the first capacitor C1 is connected with a node B, and a second end of the first capacitor C1 is connected with a node A.

In the breakpoint self-repairing light-emitting device provided in the above embodiment, in the data writing stage, the light-emitting general control module does not output a current to the breakpoint self-repairing light-emitting device, the transistor T5 is turned on, and a signal at the reference signal end is provided to the node a, so that the node a is reset; the transistor T6 is turned on to supply the signal of the initialization signal terminal to the node B, so that the node B is reset; the first capacitor stores information on the voltage difference between node a and node B. In the light emitting stage in the first state, the light emitting master control module outputs current to the breakpoint self-repairing light emitting device, the transistor T4 is switched on to provide a signal of the initialization signal end to the node A, the transistor T3 is switched on to provide a voltage signal of the node C to the node A, the potential of the node A changes and influences the potential of the node B through the first capacitor C1, so that the transistor T1 is kept switched on, the transistor T2 is kept switched off, the second light emitting device D2 emits light, and the first light emitting device D1 does not emit light. In the light emitting stage in the second state, the light emitting master control module outputs current to the breakpoint self-repairing light emitting device, the transistor T4 is switched on to provide a signal of the initialization signal end to the node A, the potential of the node A changes and affects the potential of the node B through the first capacitor C1, so that the transistor T1 is switched from on to off and the transistor T2 is switched from off to on, the second light emitting device D2 does not emit light, and the first light emitting device D1 replaces the second light emitting device D2 to emit light. When the second light-emitting module has a breakpoint fault, the first light-emitting module replaces the second light-emitting module to emit light, and therefore breakpoint self-repairing of the pixel unit is achieved.

In some exemplary embodiments, transistors T1, T3, and T4 are N-type transistors and transistors T2, T5, and T6 are P-type transistors.

Fig. 4 is an equivalent circuit schematic diagram of a breakpoint self-repair pixel driving circuit. In some exemplary embodiments: the current driving module includes: a transistor T7, a transistor T8, and a second capacitor C2; the luminous master control module comprises: a transistor T9; the breakpoint self-repair light emitting device includes: transistors T1, T2, T3, T4, T5, and T6, and a first capacitor C1;

a control electrode of the transistor T7 is connected with the node D, a first electrode of the transistor T7 is connected with a first power supply signal end VDD, and a second electrode of the transistor T7 is connected with a first electrode of the transistor T9;

a control electrode of the transistor T8 is connected with a gating signal end GATE, a first electrode of the transistor T8 is connected with a node D, and a second electrode of the transistor T8 is connected with a DATA signal end DATA;

a first end of a second capacitor C2 is connected with a first power supply signal end, and a second end of the second capacitor C2 is connected with a node D;

a control electrode of the transistor T9 is connected to the emission control signal end EM, a first electrode of the transistor T9 is connected to a second electrode of the transistor T7, and the second electrode of the transistor T9 is connected to the first end of the first light emitting device D1 and the first electrode of the transistor T1;

a first end of the first light emitting device D1 is connected to the second pole of the transistor T9 and the first pole of the transistor T1, and a second end of the first light emitting device is connected to the node C;

a control electrode of the transistor T1 is connected to the node B, a first electrode of the transistor T1 is connected to a first end of the first light-emitting device D1 and a second electrode of the transistor T9, and the second electrode of the transistor T1 is connected to the node C;

a control electrode of the transistor T2 is connected with the node B, a first electrode of the transistor T2 is connected with the node C, and a second electrode of the transistor T2 is connected with a second power supply signal end;

the control electrode of the transistor T3 is connected with the node B, the first electrode of the transistor T3 is connected with the node C, and the second electrode of the transistor T3 is connected with the node A;

the control electrode of the transistor T4 is connected with a reset control signal end, the first electrode of the transistor T4 is connected with the node A, and the second electrode of the transistor T3 is connected with an initialization signal end;

the control electrode of the transistor T5 is connected with a reset control signal end, the first electrode of the transistor T5 is connected with the node A, and the second electrode of the transistor T5 is connected with a reference signal end;

the control electrode of the transistor T6 is connected with a reset control signal end, the first electrode of the transistor T5 is connected with the node B, and the second electrode of the transistor T5 is connected with an initialization signal end;

the first end of the first capacitor C1 is connected to the node B, and the second end of the first capacitor C1 is connected to the node a.

In the breakpoint self-repairing pixel driving circuit provided in the above embodiment, in the data writing stage, the transistor T8 is turned on, a signal at the data signal end is provided to the node D, the second capacitor C2 stores voltage difference information between the node D and the first power signal end, the transistor T9 is turned off, no current signal is output to the breakpoint self-repairing light emitting device, the transistor T5 is turned on, and a signal at the reference signal end is provided to the node a, so that the node a is reset; the transistor T6 is turned on to supply the signal of the initialization signal terminal to the node B, so that the node B is reset; the first capacitor stores information on the voltage difference between node a and node B. In the light emitting stage in the first state, the transistor T7 outputs a current signal, the transistor T9 is turned on to output the current signal to the breakpoint self-repairing light emitting device, the transistor T4 is turned on to provide a signal of the initialization signal terminal to the node a, the transistor T3 is turned on to provide a voltage signal of the node C to the node a, the potential of the node a changes and affects the potential of the node B through the first capacitor C1, so that the transistor T1 remains on and the transistor T2 remains off, the second light emitting device D2 emits light, and the first light emitting device D1 does not emit light. In the light emitting stage in the second state, the transistor T7 outputs a current signal, the transistor T9 is turned on to output the current signal to the breakpoint self-repairing light emitting device, the transistor T4 is turned on to provide a signal of the initialization signal terminal to the node a, the potential of the node a changes and affects the potential of the node B through the first capacitor C1, so that the transistor T1 changes from on to off and the transistor T2 changes from off to on, the second light emitting device D2 does not emit light, and the first light emitting device D1 replaces the second light emitting device D2 to emit light. When the second light-emitting module has a breakpoint fault, the first light-emitting module replaces the second light-emitting module to emit light, and therefore breakpoint self-repairing of the pixel unit is achieved.

In some exemplary embodiments, the transistors T1, T3, and T4 are N-type transistors and the transistors T2, T5, T6, T7, T8, and T9 are P-type transistors.

In some exemplary embodiments, when the first light emitting device is a first light emitting diode, the first end of the first light emitting device is an anode and the second end of the first light emitting device is a cathode; when the second light emitting device is a second light emitting diode, the first end of the second light emitting device is an anode and the second end of the second light emitting device is a cathode.

The operation of the breakpoint self-repairing pixel driving circuit provided in fig. 4 is described below with reference to a signal timing diagram.

In some embodiments, the first power signal terminal VDD provides the first power signal, the second power signal terminal VSS provides the second power signal, the initialization signal terminal VINI provides the initialization signal, the reference signal terminal VREF provides the reference signal, the reset control signal terminal RE provides the reset control signal, the GATE control signal terminal GATE provides the GATE control signal, the emission control signal terminal EM provides the emission control signal, and the DATA signal terminal DATA provides the DATA signal. Among the above signals, the first power signal, the second power signal, the initialization signal, and the reference signal may be fixed voltage signals. The reset control signal, the gate control signal, the light emission control signal, and the data signal are pulse signals. The active level signal is a gate electrode control signal that can turn on the transistor, and the inactive level signal is a gate electrode control signal that cannot turn on the transistor.

Fig. 5 is a signal timing diagram of the breakpoint self-repairing pixel driving circuit provided in fig. 4 in a first state. The transistors T1, T3, and T4 are N-type transistors, and the transistors T2, T5, T6, T7, T8, and T9 are P-type transistors. The operation of the pixel driving circuit in one light emitting period (e.g., one frame) can be divided into two phases.

(1) First stage (t 1 stage)

The first phase is the data write phase. The gate signal is a low level signal, the transistor T8 is turned on, the data signal is provided to the node D, and the voltage value U of the node D _D And the voltage value U of the data signal _DATA Equal, U _D ＝U _DATA . The second capacitor C2 stores information of a voltage difference between the node D and the first power signal terminal.

The light emission control signal is a high level signal, and the transistor T9 is turned off.

The reset control signal is a low level signal, the transistor T5 is turned on, and a reference signal is supplied to the node a to reset the potential of the node a. Voltage value U of node a _A And the voltage value U of the reference signal _VREF Equal, U _A ＝U _VREF 。

The reset control signal is a low level signal, the transistor T6 is turned on, and an initialization signal is supplied to the node B to reset the potential of the node B. Voltage value U of node B _B And the voltage value U of the initialization signal _VINI Equal, U _B ＝U _VINI 。

The reset control signal is a low level signal, and the transistor T4 is turned off.

The transistor T1 is an N-type transistor, and the threshold voltage VTH of the transistor T1 _T1 Is greater than 0. When the voltage value U of the initialization signal _VINI Higher than the threshold voltage VTH of the transistor T1 _T1 Due to the voltage value U of the node B _B And the voltage value U of the initialization signal _VINI Are equal, therefore, the voltage value U of the node B _B Higher than the threshold voltage VTH of the transistor T1 _T1 The transistor T1 is turned on. The transistor T1 is turned on so that the first light emitting device D1 is short-circuited.

The transistor T2 is a P-type transistor, and the threshold voltage VTH of the transistor T2 _T2 Is less than 0. When the voltage value U of the initialization signal _VINI Higher than threshold voltage VTH of transistor T2 _T2 Due to the voltage value U of the node B _B And the voltage value U of the initialization signal _VINI Are equal, therefore, the voltage value U of the node B _B Higher than threshold voltage VTH of transistor T2 _T2 Therefore, the transistor T2 is turned off.

The transistor T3 is an N-type transistor, and the threshold voltage VTH of the transistor T3 _T3 Is greater than 0. When the voltage value U of the initialization signal _VINI Higher than threshold voltage VTH of transistor T3 _T3 Due to the voltage value U of the node B _B And the voltage value U of the initialization signal _VINI Equal, therefore, the voltage value U of the node B _B Higher than threshold voltage VTH of transistor T3 _T3 The transistor T3 is turned on.

The capacitor C1 stores information on a voltage difference between the node B and the node a, the voltage difference Δ V = U _B -U _A ＝U _VINI -U _VREF 。

(2) Second stage (t 2 stage)

The second phase is a light emitting phase. The gating signal being a high level signalThe transistor T8 is turned off, and the voltage value at the node D maintains the voltage value U of the data signal due to the existence of the second capacitor C2 _DATA . The transistor T7 is turned on, and the transistor T7 converts a data signal (display data signal) into a current signal to realize a gray scale under the control of the voltage signal of the node D, and outputs the current signal to the breakpoint self-repairing light emitting device through the transistor T9.

The light-emitting control signal is a low level signal, the transistor T9 is turned on, and the current signal generated by the transistor T7 is output to the breakpoint self-repairing light-emitting device.

The reset control signal is a high level signal and the transistors T5 and T6 are turned off.

The reset control signal is a high level signal, and the transistor T4 is turned on to supply the initialization signal to the node a.

The transistor T1 is turned on, the current signal is transmitted to the node C through the transistor T1, the transistor T2 is turned off, and the current signal flows from the node C to the second power signal terminal through the second light emitting device D2, so that the second light emitting device D2 emits light. Voltage value U of node C _C Equal to terminal voltage U of first terminal of second light emitting device _D2 I.e. U _C ＝U _D2 . When the second light emitting device is a light emitting diode (second light emitting diode), since there is a fixed conduction voltage drop when the light emitting diode is conducted in the forward direction, if the signal voltage value of the second power signal terminal is 0V, the terminal voltage U of the first terminal of the second light emitting diode is equal to the terminal voltage U of the second power signal terminal _D2 Equal to the forward conduction voltage drop of the light emitting diode.

The transistor T3 is turned on to supply the voltage signal of the node C to the node a.

When the transistors T3 and T4 are turned on simultaneously, the voltage of the node A jumps, and the voltage value U 'of the node A after the jump is generated' _A Can be obtained by the following formula (1):

due to the existence of the first capacitor C1, after the voltage of the node A jumps, the voltage of the node B also jumps, and the voltage value U 'of the node B after jumping' _B Can be obtained by the following formula (2):

in fig. 5, the voltage value of the node a in the data writing phase is a1, the voltage value of the node a in the light emitting phase is a2, and a2 is smaller than a1. The voltage value of the node B in the data writing phase is B1, the voltage value of the node B in the light emitting phase is B2, and B2 is smaller than B1.

The transistor T1 is an N-type transistor, and the voltage value U 'of the node B after transition' _B Higher than the threshold voltage VTH of the transistor T1 _T1 That is, when U' _B ＞VTH _T1 At this time, the transistor T1 continues to maintain the on state.

The transistor T3 is an N-type transistor, and the voltage value U 'of the node B after transition' _B Higher than threshold voltage VTH of transistor T3 _T3 That is, when U' _B ＞VTH _T3 At this time, the transistor T3 continues to maintain the on state. The transistor T1 and the transistor T3 may use the same transistor, and thus, VTH _T1 And VTH _T3 May be equal.

The transistor T2 is a P type transistor, and is U' _B ＞VTH _T1 Therefore, U' _B ＞VTH _T2 Therefore, the transistor T2 continues to maintain the off state.

The capacitor C1 stores the information of the voltage difference between the node B and the node a after the jump, and the voltage difference does not change before and after the jump.

In the first state, the voltage value of the initialization signal is set appropriately, so that the transistor T1 can be turned on in the data writing phase. By properly setting the voltage value of the reference signal and selecting the light emitting device with the proper forward conduction voltage drop, the potential of the node B can continuously meet the condition that the transistor T1 is conducted in the light emitting stage, so that the first light emitting device is short-circuited and does not emit light, and only the second light emitting device emits light.

In some exemplary embodiments, the voltage value U of the initialization signal _VINI Can be set to 2V, the voltage value U of the reference signal _VREF Can be set to 6V, the forward conduction voltage drop of the light emitting device can be 8V, and if the second power signal terminal is grounded, U is set to _D2 =8V. Threshold voltage VTH of transistor T1 _T1 May be 0.7V, the threshold voltage VTH of the transistor T2 _T2 May be-0.7V. During the data writing phase, the voltage value U of the node A _A =6V, voltage value U of node B _B In case 2V is higher than 0.7V, the transistor T1 is turned on and the transistor T2 is turned off. In the light-emitting stage, the voltage value U of the node A after jumping _A =5V, voltage value U of node B after jump _B =1V, since 1V is still higher than 0.7V, the transistor T1 remains on and the transistor T2 remains off. The transistor T1 is turned on so that the first light emitting device does not emit light, and the transistor T2 is turned off so that the second light emitting device emits light.

Fig. 6 is a signal timing diagram of the breakpoint self-repair pixel driving circuit provided in fig. 4 in a second state. The transistors T1, T3, and T4 are N-type transistors, and the transistors T2, T5, T6, T7, T8, and T9 are P-type transistors. The operation of the pixel driving circuit in one light emitting period (e.g., one frame) can be divided into two phases.

(1) First stage (t 1 stage)

The reset control signal is a low level signal, the transistor T6 is turned on, and an initialization signal is supplied to the node B to reset the potential of the node B. Voltage of node BValue U _B And the voltage value U of the initialization signal _VINI Equal, U _B ＝U _VINI 。

The reset control signal is a low level signal and the transistor T4 is turned off.

The transistor T3 is an N-type transistor, and the threshold voltage VTH of the transistor T3 _T3 Is greater than 0. When the voltage value U of the initialization signal _VINI Higher than threshold voltage VTH of transistor T3 _T3 Due to the voltage value U of the node B _B And the voltage value U of the initialization signal _VINI Are equal, therefore, the voltage value U of the node B _B Higher than threshold voltage VTH of transistor T3 _T3 The transistor T3 is turned on. The transistor T1 and the transistor T3 may use the same transistor, and thus, VTH _T1 And VTH _T3 May be equal.

(2) Second stage (t 2 stage)

The second phase is a light emitting phase. The gate signal is a high level signal, the transistor T8 is turned off, and the voltage value of the node D is obtained due to the existence of the second capacitor C2Holding the voltage value U of the data signal _DATA . The transistor T7 is turned on.

The light emission control signal is a low level signal, and the transistor T9 is turned on.

The transistor T1 is turned on, the transistor T2 is turned off, and the second light emitting module has a breakpoint fault, so that the node C and the second power signal terminal are disconnected. As the transistors T3 and T4 are conducted, the potential of the node A jumps, and the potential U of the node A after jumping jumps _A ' potential U of AND node C _C Equal and equal to the voltage value U of the initialization signal _VINI I.e. U _A '＝U _VINI ，U _C ＝U _VINI 。

Due to the existence of the first capacitor C1, after the voltage of the node A jumps, the voltage of the node B also jumps, and the voltage value U 'of the node B after jumping' _B Can be obtained by the following formula (3):

U' _B ＝2*U _VINI -U _VREF ； (3)

in fig. 6, the voltage value of the node a in the data writing phase is a1, the voltage value of the node a in the light emitting phase is a3, and a3 is smaller than a1. The voltage value of the node B in the data writing phase is B1, the voltage value of the node B in the light emitting phase is B3, and B3 is smaller than B1. Comparing fig. 6 and fig. 5, a3 is less than a2 and b3 is less than b2. Therefore, the amplitude of the voltage jump of the node A in the first state is smaller than that in the second state, and the amplitude of the voltage jump of the node B in the first state is smaller than that in the second state.

The transistor T1 is an N-type transistor, and the voltage value U 'of the node B after transition' _B Below the threshold voltage VTH of transistor T1 _T1 That is, when U' _B ＜VTH _T1 At this time, the transistor T1 is switched from the on state to the off state.

The transistor T3 is an N-type transistor after transitionVoltage value U 'of node B' _B Below the threshold voltage VTH of transistor T3 _T3 That is, when U' _B ＜VTH _T3 At this time, the transistor T3 is switched from the on state to the off state. The transistor T1 and the transistor T3 may use the same transistor, and thus, VTH _T1 And VTH _T3 May be equal.

The transistor T2 is a P-type transistor, and the voltage value U 'of the node B after transition' _B Below the threshold voltage VTH of transistor T2 _T2 That is, when U' _B ＜VTH _T2 When the transistor T2 is switched from the off state to the on state.

Since the transistor T2 is a P-type transistor, VTH _T2 < 0, the transistor T1 is an N-type transistor, VTH _T1 > 0, therefore VTH _T2 Less than VTH _T1 Is when U' _B ＜VTH _T2 Simultaneously also satisfy U' _B ＜VTH _T1 The conditions of (1). That is, when the transistor T2 is turned on, the transistor T1 is turned off.

In the second state, the voltage value of the initialization signal is set appropriately, so that the transistor T1 can be turned on in the data writing phase. The voltage value of the reference signal is properly set so that the potential of the node B satisfies the condition that the transistor T2 is turned on during the light emitting period, thereby establishing a path between the node C and the second power signal terminal, and the transistor T1 is turned from on to off, so that the first light emitting device can emit light instead of the second light emitting device.

In some exemplary embodiments, the voltage value U of the initialization signal _VINI Can be set to 2V, the voltage value U of the reference signal _VREF May be set to 6V. Threshold voltage VTH of transistor T1 _T1 May be 0.7V, the same transistor may be used for the transistor T3 and the transistor T1, and the threshold voltage VTH of the transistor T3 _T3 Or 0.7V, the threshold voltage VTH of the transistor T2 _T2 May be-0.7V. During the data writing phase, the voltage value U of the node A _A =6V, voltage value U of node B _B In case 2V is higher than 0.7V, the transistor T1 is turned on and the transistor T2 is turned off. In the light-emitting stage, the voltage value U of the node A after jumping _A =2V, voltage value U of node B after jump _B =2V, the transistors T1 and T3 switch from the on state to the off state because-2V is lower than 0.7V, and the transistor T2 switches from the off state to the on state because-2V is lower than-0.7V. The second light emitting module has a breakpoint fault, so that the second light emitting device does not emit light, the transistor T2 is turned on to establish a path between the node C and the second power signal terminal, and the transistor T1 is turned off to make the first light emitting device emit light.

The embodiment of the disclosure provides a driving method of a breakpoint self-repairing pixel driving circuit, and fig. 7 is a flowchart of the driving method of the breakpoint self-repairing pixel driving circuit provided by the embodiment of the disclosure. As shown in fig. 7, the driving method of the breakpoint self-repair pixel driving circuit provided in the embodiment of the present disclosure may include the following steps:

In the driving method of the breakpoint self-repair pixel driving circuit provided in the above embodiment, the light emitting switching control module provides a current signal to the second light emitting module when the second light emitting module is connected normally, so as to drive the second light emitting module to emit light. The light-emitting switching control module provides a current signal for the first light-emitting module when the second light-emitting module has a breakpoint fault, and drives the first light-emitting module to emit light, so that the breakpoint fault of the second light-emitting module is automatically repaired, and the pixel unit is prevented from being scrapped or repaired due to the breakpoint fault of the light-emitting device.

In some exemplary embodiments, the driving method further includes:

in a data writing stage, the first initialization unit provides a signal of a reference signal end to the node A under the control of a signal of a reset control signal end; the second initialization unit provides the signal of the initialization signal terminal to the node B under the signal control of the reset control signal terminal; the energy storage unit stores voltage difference information between the node A and the node B; the first switch unit is switched on under the control of the voltage signal of the node B, and the second switch unit is switched off under the control of the voltage signal of the node B; the first connection control unit is switched on under the control of a voltage signal of a node B, and the second connection control unit is switched off under the control of a signal of a reset control signal end;

wherein the light emission switching control module includes: the device comprises a first initialization unit, a second initialization unit, a first connection control unit, a second connection control unit, a first switch unit, a second switch unit and an energy storage unit; the first light emitting module includes a first light emitting device, and the second light emitting module includes a second light emitting device.

In some exemplary embodiments, the lighting switching control module providing the current signal to the second lighting module in the lighting phase of the first state includes:

in a light emitting stage of a first state, the first switching unit maintains an on state under the control of the voltage signal of the node B to make the first light emitting device not emit light, the second switching unit maintains an off state under the control of the voltage signal of the node B to make the second light emitting device emit light, the first connection control unit maintains an on state under the control of the voltage signal of the node B to supply the voltage signal of the node C to the node a, and the second connection control unit switches from the off state to the on state under the control of the signal of the reset control signal terminal to supply the signal of the initialization signal terminal to the node a;

in some exemplary embodiments, the lighting switching control module providing the current signal to the first lighting module in the lighting phase of the second state includes:

in a light emitting stage of the second state, the first switching unit is switched from an on state to an off state under control of the voltage signal of the node B to cause the first light emitting device to emit light, the second switching unit is switched from the off state to the on state under control of the voltage signal of the node B to establish a path between the node C and the second power signal terminal, the first connection control unit is switched from the on state to the off state under control of the voltage signal of the node B, and the second connection control unit is switched from the off state to the on state under control of the signal of the reset control signal terminal to supply the signal of the initialization signal terminal to the node a.

In some exemplary embodiments, the voltage value U of the initialization signal provided by the initialization signal terminal _VINI Higher than the threshold voltage VTH of the transistor T1 _T1 I.e. U _VINI ＞VTH _T1 ；

In some exemplary embodiments, the voltage value U of the initialization signal provided by the initialization signal terminal _VINI Voltage value U of reference signal provided by reference signal terminal _VREF Satisfies the following relation (1):

2*U _VINI -U _VREF ＜VTH _T2 (1)

wherein VTH _T2 Is the threshold voltage of transistor T2;

the first switch unit comprises a transistor T1, the second switch unit comprises a transistor T2, the first connection control unit comprises a transistor T3, the second connection control unit comprises a transistor T4, the first initialization unit comprises a transistor T5, the second initialization unit comprises a transistor T6, the energy storage unit comprises a first capacitor C1, the first light emitting device is a first light emitting diode D1, and the second light emitting device is a second light emitting diode D2; the transistors T1, T3 and T4 are N-type transistors, and the transistors T2, T5, T6, T7, T8 and T9 are P-type transistors;

in some exemplary embodiments, the voltage value U of the initialization signal provided by the initialization signal terminal _VINI Voltage value U of reference signal provided by reference signal terminal _VREF And a second LED D2 in the first state lighting stageAnode voltage value U _D2 Satisfies the following relation (2):

voltage value U of initialization signal provided by initialization signal terminal _VINI Higher than the threshold voltage VTH of the transistor T1 _T1 The transistor T1 may be turned on during the data writing period, and the transistor T2 may be turned off during the data writing period.

Voltage value U of initialization signal provided by initialization signal terminal _VINI Voltage value U of reference signal provided by reference signal terminal _VREF The transistor T1 can be switched from the on state to the off state in the light emitting stage of the second state so that the first light emitting diode can emit light, and the relational expression (1) is satisfied; the transistor T2 can be switched from the off state to the on state in the light emitting stage of the second state, so that when a breakpoint fault occurs in the second light emitting module, a path between the node C and the second power signal terminal is established, and a function of repairing the breakpoint is performed.

Voltage value U of initialization signal provided by initialization signal terminal _VINI A voltage value U of a reference signal provided by a reference signal terminal _VREF And the anode voltage value U of the second LED D2 in the first state light-emitting stage _D2 The relation (2) is satisfied, the transistor T1 can be kept in a conducting state in the light emitting stage of the first state, and the first light emitting diode does not emit light; the transistor T2 may be kept in an off state during the light emitting period of the first state, so that the second light emitting diode continues to emit light.

The embodiment of the application also provides a display device which comprises the breakpoint self-repairing pixel driving circuit.

The display device may be an LED display device. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A breakpoint self-repair pixel drive circuit, comprising: the current driving module, the light-emitting master control module and the breakpoint self-repairing light-emitting device are sequentially connected in series between the first power signal end and the second power signal end; the breakpoint self-repair light emitting device includes: the device comprises a first light-emitting module, a second light-emitting module and a light-emitting switching control module;

the light-emitting switching control module is respectively connected with the light-emitting master control module, the first light-emitting module, the second light-emitting module and the second power signal end and is configured to provide a current signal to the second light-emitting module in a light-emitting stage of a first state and provide a current signal to the first light-emitting module in a light-emitting stage of a second state;

wherein the first light emitting module comprises a first light emitting device and the second light emitting module comprises a second light emitting device; the first light-emitting device is respectively connected with the light-emitting master control module and the node C and is configured to emit light in a light-emitting stage in a second state; the second light-emitting device is respectively connected with the node C and the second power signal end and is configured to emit light in a light-emitting stage in a first state;

the light emission switching control module includes: a first switching unit and a second switching unit;

the second switch unit is respectively connected with the node B, the node C and the second power signal end, and is configured to be disconnected in a data writing stage and a light-emitting stage of a first state, disconnected in the data writing stage of a second state, and connected in the light-emitting stage of the second state.

2. The breakpoint self-repair pixel drive circuit of claim 1, wherein:

the light emission switching control module further includes: the device comprises a first connection control unit, a second connection control unit, a first initialization unit, a second initialization unit and an energy storage unit;

the second connection control unit is respectively connected with the reset control signal end, the node A and the initialization signal end and is configured to provide a signal of the initialization signal end to the node A under the control of the signal of the reset control signal end in the light-emitting stage of the first state and the second state;

the first initialization unit is respectively connected with the reset control signal end, the node A and the reference signal end and is configured to provide a signal of the reference signal end to the node A under the control of a signal of the reset control signal end in a data writing stage of a first state and a second state;

the second initialization unit is respectively connected with the reset control signal end, the node B and the initialization signal end and is configured to provide a signal of the initialization signal end to the node B under the control of a signal of the reset control signal end in the data writing stage of the first state and the second state;

3. The breakpoint self-repair pixel drive circuit of claim 2, wherein:

the first end of the first light-emitting device is connected with the light-emitting master control module, and the second end of the first light-emitting device is connected with the node C;

a first end of the second light emitting device is connected with a node C, and a second end of the second light emitting device is connected with a second power supply signal end;

4. The breakpoint self-repair pixel drive circuit of claim 3, wherein:

the current driving module includes: a transistor T7, a transistor T8, and a second capacitor C2; the luminous master control module comprises: a transistor T9;

a control electrode of the transistor T7 is connected with the node D, a first electrode of the transistor T7 is connected with a first power supply signal end, and a second electrode of the transistor T7 is connected with a first electrode of the transistor T9;

a control electrode of the transistor T8 is connected with a gating signal end, a first electrode of the transistor T8 is connected with the node D, and a second electrode of the transistor T8 is connected with a data signal end;

a control electrode of the transistor T9 is connected to the light emitting control signal terminal, a first electrode of the transistor T9 is connected to the second electrode of the transistor T7, and a second electrode of the transistor T9 is connected to the first terminal of the first light emitting device D1 and the first electrode of the transistor T1.

5. The breakpoint self-repair pixel drive circuit of claim 3 or 4, wherein:

the transistors T1, T3, and T4 are N-type transistors, and the transistors T2, T5, and T6 are P-type transistors.

6. The breakpoint self-repair pixel drive circuit of claim 2, 3 or 4, wherein:

the first light emitting device includes: a first Light Emitting Diode (LED);

the second light emitting device includes: a second light emitting diode.

7. A driving method of the breakpoint self-repairing pixel driving circuit of any one of claims 1-6, comprising:

in a data writing stage, the first switch unit is switched on under the control of a voltage signal of a node B, and the second switch unit is switched off under the control of the voltage signal of the node B;

in a light emitting stage of a first state, the first switching unit maintains an on state under the control of a voltage signal of a node B to make the first light emitting device not emit light, and the second switching unit maintains an off state under the control of a voltage signal of a node B to make the second light emitting device emit light; in a light emitting stage of the second state, the first switching unit is switched from the on state to the off state under the control of the voltage signal of the node B to enable the first light emitting device to emit light, and the second switching unit is switched from the off state to the on state under the control of the voltage signal of the node B to establish a path between the node C and the second power signal terminal; the first state is a state when the second light-emitting module is normally connected, and the second state is a state when the second light-emitting module has a breakpoint fault;

the first light emitting module includes a first light emitting device, and the second light emitting module includes a second light emitting device; the first light-emitting device is respectively connected with the light-emitting master control module and the node C; the second light-emitting device is respectively connected with a node C and a second power signal end; the light emission switching control module includes: a first switching unit and a second switching unit; the first switch unit is respectively connected with the node B, the light-emitting master control module and the node C; and the second switch unit is respectively connected with the node B, the node C and a second power supply signal end.

8. The driving method according to claim 7, further comprising:

in a data writing stage, the first initialization unit provides a signal of a reference signal end to the node A under the control of a signal of a reset control signal end; the second initialization unit provides the signal of the initialization signal terminal to the node B under the signal control of the reset control signal terminal; the energy storage unit stores voltage difference information between the node A and the node B; the first connection control unit is switched on under the control of a voltage signal of the node B, and the second connection control unit is switched off under the control of a signal of the reset control signal end;

wherein, the luminescence switching control module further comprises: the device comprises a first initialization unit, a second initialization unit, a first connection control unit, a second connection control unit and an energy storage unit.

9. The driving method according to claim 8, characterized in that:

the light emitting switching control module providing a current signal to the second light emitting module in the light emitting stage of the first state further comprises:

in a light emitting stage of the first state, the first connection control unit maintains an on state under the control of the voltage signal of the node B to supply the voltage signal of the node C to the node a, and the second connection control unit switches from an off state to an on state under the control of the signal of the reset control signal terminal to supply the signal of the initialization signal terminal to the node a.

10. The driving method according to claim 8, characterized in that:

the light emitting switching control module providing a current signal to the first light emitting module in a light emitting stage of the second state further comprises:

in a light emitting stage of the second state, the first connection control unit is switched from the on state to the off state under the control of the voltage signal of the node B, and the second connection control unit is switched from the off state to the on state under the control of the signal of the reset control signal terminal to supply the signal of the initialization signal terminal to the node a.

11. The driving method according to claim 10, characterized in that:

voltage value U of initialization signal provided by initialization signal terminal _VINI Higher than the threshold voltage VTH of the transistor T1 _T1 ；

Voltage value U of initialization signal provided by initialization signal terminal _VINI A voltage value U of a reference signal provided by a reference signal terminal _VREF Satisfies the following relation (1):

2*U _VINI -U _VREF ＜VTH _T2 (1)

wherein VTH _T2 Is the threshold voltage of transistor T2;

the first switch unit comprises a transistor T1, the second switch unit comprises a transistor T2, the first connection control unit comprises a transistor T3, the second connection control unit comprises a transistor T4, the first initialization unit comprises a transistor T5, the second initialization unit comprises a transistor T6, the energy storage unit comprises a first capacitor C1, the first light emitting device is a first light emitting diode D1, and the second light emitting device is a second light emitting diode D2; the transistors T1, T3, and T4 are N-type transistors, and the transistors T2, T5, T6, T7, T8, and T9 are P-type transistors.

12. The driving method according to claim 9, characterized in that:

Voltage value U of initialization signal provided by initialization signal terminal _VINI Voltage value U of reference signal provided by reference signal terminal _VREF And the anode voltage value U of the second LED D2 in the first state light-emitting stage _D2 Satisfies the following relation (2):

13. A display device comprising the breakpoint self-repair pixel drive circuit of any one of claims 1-6.