Pixel driving circuit, display panel and display device

Abstract

The present disclosure provides a pixel driving circuit, a display panel and a display device, which belong to the field of display technology and can solve the problem of dark spots in existing display panels. The pixel driving circuit of the present disclosure includes: a data writing subcircuit, a first driving subcircuit, a second driving subcircuit, a first storage subcircuit, a second storage subcircuit, a first repair subcircuit and a second repair subcircuit; the first repair subcircuit is configured to cut off the path between the first power supply voltage terminal and the second node when a reverse current passes through the first light-emitting device; the second repair subcircuit is configured to cut off the path between the first power supply voltage terminal and the third node when a reverse current passes through the second light-emitting device.

Description

Technical Field

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

[0002] Organic Light-Emitting Diode (OLED) is a light-emitting device that uses organic solid-state semiconductors as light-emitting materials. It has broad application prospects due to its advantages such as simple preparation process, low cost, low power consumption, high luminous brightness, and wide operating temperature adaptability.

[0003] During the preparation of OLED display panels, when sputtering is performed to form the topmost conductive layer of the pixel driving circuit, metal particles may be generated before and after the sputtering. The metal particles embedded in the flat layer or the insulating layer cause local protrusions in the insulating layer or the flat layer, resulting in protrusions in the topmost conductive layer of the pixel driving circuit layer. At the same time, the insulating layer or the flat layer coated above is locally thin, and the distance between the topmost conductive layer of the pixel driving circuit layer and the anode of the light-emitting device located on the upper layer becomes closer. The metal particles can easily cause a short circuit between the two, resulting in dark spot defects. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provides a pixel driving circuit, a display panel and a display device.

[0005] In a first aspect, an embodiment of the present disclosure provides a pixel driving circuit, the pixel driving circuit comprising: a data writing subcircuit, a first driving subcircuit, a second driving subcircuit, a first storage subcircuit, a second storage subcircuit, a first repair subcircuit, and a second repair subcircuit;

[0006] The data writing subcircuit is configured to write a data signal into a first node in response to a scan signal; the first node is a connection point between the data writing subcircuit, the first driving subcircuit, the second driving subcircuit, the first storage subcircuit, and the second storage subcircuit;

[0007] The first driving subcircuit is configured to convert a voltage signal at the first power supply voltage terminal into a driving current in response to a voltage at the first node, and provide the driving current to a second node; the second node is a connection point between the first driving subcircuit, the first storage subcircuit, and the first electrode of the first light-emitting device;

[0008] The second driving subcircuit is configured to convert the voltage signal of the first power supply voltage terminal into a driving current in response to the voltage of the first node, and provide the driving current to a third node; the third node is a connection point between the second driving subcircuit, the second storage subcircuit, and the first electrode of the second light-emitting device;

[0009] The first storage sub-circuit is configured to store voltages of the first node and the second node;

[0010] The second storage sub-circuit is configured to store voltages of the first node and the third node;

[0011] The first repair subcircuit is configured to cut off a path between the first power supply voltage terminal and the second node when a reverse current flows through the first light-emitting device;

[0012] The second repair sub-circuit is configured to cut off a path between the first power supply voltage terminal and the third node when a reverse current flows through the second light emitting device.

[0013] Optionally, the first repair subcircuit includes: a first resistor; the second repair subcircuit includes: a second resistor;

[0014] One end of the first resistor is connected to the first power supply voltage terminal, and the other end is connected to the first driving sub-circuit;

[0015] One end of the second resistor is connected to the first power supply voltage terminal, and the other end is connected to the second driving sub-circuit.

[0016] Optionally, the first repair sub-circuit includes: a third resistor; the second repair sub-circuit includes: a fourth resistor;

[0017] One end of the third resistor is connected to the first driving sub-circuit, and the other end is connected to the second node;

[0018] One end of the fourth resistor is connected to the second driving sub-circuit, and the other end is connected to the third node.

[0019] Optionally, the pixel driving circuit further includes: a first sensing sub-circuit and a second sensing sub-circuit;

[0020] The first sensing sub-circuit is configured to compensate the voltage of the second node using the voltage of the sensing signal terminal in response to the second scanning signal;

[0021] The second sensing sub-circuit is configured to compensate the voltage of the third node using the voltage of the sensing signal terminal in response to the second scanning signal.

[0022] Optionally, the first sensing sub-circuit includes: a fourth transistor; the second sensing sub-circuit includes: a fifth transistor;

[0023] The control electrode of the fourth transistor is connected to the second scanning signal terminal, the first electrode is connected to the sensing signal terminal, and the second electrode is connected to the second node;

[0024] The control electrode of the fifth transistor is connected to the second scanning signal terminal, the first electrode is connected to the sensing signal terminal, and the second electrode is connected to the third node.

[0025] Optionally, the first repair subcircuit is further configured to cut off the path between the sensing signal terminal and the second node when a reverse current flows through the first light-emitting device;

[0026] The second repair sub-circuit is configured to cut off a path between the sensing signal terminal and the third node when a reverse current flows through the second light-emitting device.

[0027] Optionally, the first repair sub-circuit further includes: a fifth resistor; the second repair sub-circuit further includes: a sixth resistor;

[0028] One end of the fifth resistor is connected to the second electrode of the fourth transistor, and the other end is connected to the second node;

[0029] One end of the sixth resistor is connected to the second electrode of the fifth transistor, and the other end is connected to the third node.

[0030] Optionally, the data writing subcircuit includes: a first transistor; the first driving subcircuit includes: a second transistor; the second driving subcircuit includes: a third transistor; the first storage subcircuit includes: a first storage capacitor; the second storage subcircuit includes: a second storage capacitor;

[0031] The control electrode of the first transistor is connected to the first scan signal terminal, the first electrode is connected to the data signal terminal, and the second electrode is connected to the first node;

[0032] The control electrode of the second transistor is connected to the first node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the second node;

[0033] The control electrode of the third transistor is connected to the first node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the third node;

[0034] One end of the first storage capacitor is connected to the first node, and the other end is connected to the second node;

[0035] One end of the second storage capacitor is connected to the first node, and the other end is connected to the third node.

[0036] Optionally, the first resistor is formed by lapping the first electrode, the second electrode of the first light-emitting device and a first power signal line connected to the first power voltage terminal;

[0037] The second resistor is formed by lapping the first electrode and the second electrode of the second light emitting device and a first power signal line connected to the first power voltage terminal.

[0038] Optionally, the resistance of the first resistor and the second resistor is 1000 ohms to 3000 ohms.

[0039] In a second aspect, an embodiment of the present disclosure provides a display panel, comprising: a plurality of sub-pixels; each of the sub-pixels comprises a pixel driving circuit as provided above.

[0040] Optionally, the first light-emitting device and the second light-emitting device in the same sub-pixel have the same color;

[0041] The colors of the first light-emitting devices in adjacent sub-pixels are different.

[0042] In a third aspect, an embodiment of the present disclosure provides a display device, which includes a display panel as provided above. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic structural diagram of an exemplary pixel driving circuit.

[0044] Figure 2 A schematic structural diagram of a pixel driving circuit provided in an embodiment of the present disclosure.

[0045] Figure 2a A timing diagram of a pixel driving circuit provided in an embodiment of the present disclosure.

[0046] Figure 2b A schematic diagram of a resistor burning out in a pixel driving circuit provided in an embodiment of the present disclosure.

[0047] Figure 3 A schematic diagram of the structure of another pixel driving circuit provided in an embodiment of the present disclosure.

[0048] Figure 3a A schematic diagram of a resistor burnout in another pixel driving circuit according to an embodiment of the present disclosure.

[0049] Figure 4 A schematic structural diagram of another pixel driving circuit provided in an embodiment of the present disclosure.

[0050] Figure 4a A timing diagram of another pixel driving circuit provided in an embodiment of the present disclosure.

[0051] Figure 4b A schematic diagram of a resistor burning in another pixel driving circuit provided in an embodiment of the present disclosure.

[0052] Figure 5 , Figure 6 and Figure 7 A schematic diagram of a resistor structure in a pixel driving circuit provided in an embodiment of the present disclosure.

[0053] Figure 8 A schematic diagram of a pixel arrangement structure in a display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0055] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] Figure 1 is a schematic diagram of an exemplary pixel driving circuit structure, such as Figure 1 As shown, the pixel driving circuit includes: a data writing transistor M1, a driving transistor M2, a sensing transistor M3, a storage capacitor C and a light emitting device D. The first electrode of the light emitting device D may be an anode, and the second electrode may be a cathode.

[0057] Specifically, the gate of the data writing transistor M1 is connected to the first scanning signal terminal Gate1, the source is connected to the data signal terminal Data, and the drain is connected to the first node N1, which is a connection point between the drain of the data writing transistor M1, the gate of the driving transistor M2, and the storage capacitor C. The gate of the driving transistor M2 is connected to the first node N1, the source is connected to the first power supply voltage terminal VDD, and the drain is connected to the second node N2, which is a connection point between the drain of the driving transistor M2, the anode of the light emitting device D, and the drain of the sensing transistor M3. The gate of the sensing transistor M3 is connected to the second scanning signal terminal Gate2, the source is connected to the sensing signal terminal Sense, and the drain is connected to the second node N2. One end of the storage capacitor C is connected to the first node N1, and the other end is connected to the second node N2. The anode of the light emitting device D is connected to the second node N2, and the cathode is connected to the second power supply voltage terminal VSS. The first power supply voltage terminal VDD is a high-level voltage terminal, and the second power supply voltage terminal VSS is a low-level power supply voltage terminal.

[0058] Among them, the data writing transistor M1 is turned on under the control of the first scanning signal, and the data signal of the data signal terminal Data can be input to the first node N1. The driving transistor M3 can be turned on under the drive of the voltage of the first node N1, and the voltage of the first power supply voltage terminal VDD is converted into a driving current and input to the second node N2. At the same time, the sensing transistor M3 is turned on under the control of the second scanning signal, and the sensing signal can be input to the second node N2. The storage capacitor C can store the voltage of the first node N1 and the second node N2 to externally compensate the voltage of the anode of the light-emitting device D, so as to avoid the threshold voltage offset of the driving transistor M2 affecting the brightness of the light-emitting device D.

[0059] During the preparation of the display panel, when the top conductive layer of the pixel driving circuit is formed by sputtering, metal particles may be generated before and after the sputtering. The metal particles embedded in the flat layer or the insulating layer cause the insulating layer or the flat layer to partially protrude, resulting in a protrusion in the top conductive layer of the pixel driving circuit layer. At the same time, the insulating layer or the flat layer coated above is partially thin, and the distance between the top conductive layer of the pixel driving circuit layer and the anode of the light-emitting device located on the upper layer becomes closer. The metal particles can easily cause a short circuit between the two, resulting in dark spot defects.

[0060] In order to solve at least one of the above-mentioned technical problems, the present disclosure provides a pixel driving circuit, a display panel and a display device. The pixel driving circuit, the display panel and the display device provided in the embodiments of the present disclosure will be further described in detail below in combination with the accompanying drawings and specific implementation methods.

[0061] It should be noted that, according to the characteristics of transistors, transistors can be divided into N-type transistors and P-type transistors. For the sake of clarity, the embodiments of the present disclosure take the transistor as a P-type transistor (for example, a P-type MOS transistor) as an example to elaborate on the technical solution of the present disclosure. However, the transistors of the embodiments of the present disclosure are not limited to P-type transistors. Those skilled in the art can also use N-type transistors (for example, N-type MOS transistors) according to actual needs to implement the functions of one or more transistors in the embodiments of the present disclosure.

[0062] It should be noted that the transistors used in the embodiments of the present disclosure may be thin film transistors or field effect transistors or other switching devices with the same characteristics, and the thin film transistors may include oxide semiconductor thin film transistors, amorphous silicon thin film transistors or polycrystalline silicon thin film transistors, etc. The control electrode of the transistor is the gate, the first electrode is the source, and the second electrode is the drain. The source and drain may be symmetrical in structure, so the source and drain may have no difference in physical structure.

[0063] It should be noted that, in the embodiment of the present disclosure, the pixel driving circuit can Figure 1 In addition to the 3T1C structure (i.e., three transistors and one storage capacitor) shown, it can also be a structure including other numbers of transistors, such as a 7T2C structure, a 6T1C structure, a 6T2C structure, or a 9T2C structure. The embodiments of the present disclosure are not limited to this, and the above circuit structures are used as examples in the following description.

[0064] Figure 2 A schematic diagram of a pixel driving circuit provided in an embodiment of the present disclosure is shown in FIG. Figure 3 A schematic diagram of another pixel driving circuit provided in an embodiment of the present disclosure is shown in FIG. Figure 2 and Figure 3 As shown, the pixel driving circuit includes: a data writing subcircuit 201, a first driving subcircuit 202, a second driving subcircuit 203, a first storage subcircuit 204, a second storage subcircuit 205, a first repairing subcircuit 206 and a second repairing subcircuit 207.

[0065] The data writing subcircuit 201 is configured to write the data signal into the first node N1 in response to the scan signal; the first node N1 is the connection point between the data writing subcircuit 201, the first driving subcircuit 202, the second driving subcircuit 203, the first storage subcircuit 204, and the second storage subcircuit 205.

[0066] The first driving subcircuit 202 is configured to convert the voltage signal of the first power supply voltage terminal VDD into a driving current in response to the voltage of the first node N1, and provide the driving current to the second node N2; the second node N2 is the connection point between the first driving subcircuit 202, the first storage subcircuit 204, and the anode of the first light-emitting device D1.

[0067] The second driving subcircuit 203 is configured to convert the voltage signal of the first power supply voltage terminal VDD into a driving current in response to the voltage of the first node N1, and provide the driving current to the third node N3; the third node N3 is the connection point between the second driving subcircuit 203, the second storage subcircuit 205, and the anode of the second light-emitting device D2.

[0068] The first storage sub-circuit 204 is configured to store voltages of the first node N1 and the second node N2 .

[0069] The second storage sub-circuit 205 is configured to store voltages of the first node N1 and the third node N3 .

[0070] The first repair sub-circuit 206 is configured to cut off the path between the first power supply voltage terminal VDD and the second node N2 when a reverse current flows through the first light emitting device D1 .

[0071] The second repair sub-circuit 207 is configured to cut off the path between the first power supply voltage terminal VDD and the third node N3 when a reverse current flows through the second light emitting device D2.

[0072] The pixel driving circuit provided in the embodiment of the present disclosure can be divided into two light-emitting paths. Under normal circumstances, the voltage of the first power supply voltage terminal VDD is a high-level voltage, and the voltage of the second power supply voltage terminal VSS is a low-level voltage. The first driving subcircuit 202 can convert the voltage of the first power supply voltage terminal VDD into a driving current, and the driving current can be transmitted from the anode of the first light-emitting device D1 to the cathode direction, so that the first light-emitting device D1 emits light. The second driving subcircuit 203 can convert the voltage of the first power supply voltage terminal VDD into a driving current, and the driving current can be transmitted from the anode of the second light-emitting device D2 to the cathode direction, so that the second light-emitting device D2 emits light. When a light-emitting device in one of the light-emitting paths is short-circuited, resulting in a dark spot defect, the voltage of the first power supply voltage terminal VDD can be changed to a low-level voltage, and the voltage of the second power supply voltage terminal VSS can be changed to a high-level voltage. Taking the short circuit of the first light emitting device D1 as an example, the first light emitting device D1 is equivalent to a wire, in which current can be transmitted, so that the current flows from the second power supply voltage terminal VSS to the first power supply voltage terminal VDD. A first repair subcircuit 206 is set in the path, and the current size can be adjusted by setting the voltage of the first power supply terminal VDD and the second power supply voltage terminal VSS. The first repair subcircuit 206 can be burned out under the action of a large current to cut off the path between the first power supply voltage terminal VSS and the second node N2. The second light emitting device D2 has unidirectional conductivity and plays a reverse cutoff role. The second repair subcircuit 207 remains intact, and the path remains good. Under normal circumstances, the display function can be realized. In this way, the difficulty of repairing pixel dark spots can be reduced, and even the effect of no need for repair can be achieved, thereby reducing the repair cost and improving production efficiency.

[0073] In some embodiments, Figure 2 As shown, the first repair sub-circuit 206 includes: a first resistor R1; the second repair sub-circuit 207 includes: a second resistor R2; one end of the first resistor R1 is connected to the first power supply voltage terminal VDD, and the other end is connected to the first driving sub-circuit 202; one end of the second resistor R2 is connected to the first power supply voltage terminal VDD, and the other end is connected to the second driving sub-circuit 203.

[0074] Specifically, the first repair subcircuit 206 may be a first resistor R1 having a relatively large resistance, and the second repair subcircuit 207 may be a second resistor R2 having a relatively large resistance. For example, the resistance of the first resistor R1 and the second resistor R2 may be 2000 ohms to 3000 ohms. The first resistor R1 may be connected between the first power supply voltage terminal VDD and the first driving subcircuit 202, and the second resistor R2 may be connected between the first power supply voltage terminal VDD and the second driving subcircuit 203. When a short circuit occurs in the first light-emitting device D1, causing a dark spot defect, the voltage of the first power supply voltage terminal VDD may be changed to a low-level voltage, and the voltage of the second power supply voltage terminal VSS may be changed to a high-level voltage (its timing diagram is shown in FIG. 1 ). Figure 2a The first light emitting device D1 is equivalent to a wire, in which current can be transmitted, so that the current flows from the second power supply voltage terminal VSS to the first power supply voltage terminal VDD. A first resistor R1 is arranged in the path, and the current size can be adjusted by setting the voltage of the first power supply terminal VDD and the second power supply voltage terminal VSS. The first resistor R1 can be burned out under the action of a large current (its schematic diagram is shown in FIG. Figure 2b As shown in the figure, the path between the first power supply voltage terminal VSS and the second node N2 is cut off. The second light emitting device D2 has unidirectional conductivity and plays a reverse cutoff role. The second resistor R2 therein remains intact, and the path remains good. Under normal circumstances, the display function can be realized. In this way, the difficulty of repairing pixel dark spots can be reduced, and even the effect of not needing repair can be achieved, thereby reducing the repair cost and improving production efficiency.

[0075] In some embodiments, Figure 3 As shown, the first repair sub-circuit 206 includes: a third resistor R3; the second repair sub-circuit 207 includes: a fourth resistor R4; one end of the third resistor R3 is connected to the first driving sub-circuit 202, and the other end is connected to the second node N2; one end of the fourth resistor R4 is connected to the second driving sub-circuit 203, and the other end is connected to the third node N3.

[0076] Specifically, the first repair subcircuit 206 may be a third resistor R3 having a relatively large resistance, and the second repair subcircuit 207 may be a fourth resistor R4 having a relatively large resistance. For example, the resistance of the third resistor R3 and the fourth resistor R4 may be 2000 ohms to 3000 ohms. The third resistor R3 may be connected between the first driving subcircuit 202 and the second node N2 (i.e., the anode of the first light-emitting device D1), and the fourth resistor R4 may be connected between the second driving subcircuit 203 and the third node N3 (i.e., the anode of the second light-emitting device D2). When a short circuit occurs in the first light-emitting device D1, causing a dark spot defect, the voltage of the first power supply voltage terminal VDD may be changed to a low-level voltage, and the voltage of the second power supply voltage terminal VSS may be changed to a high-level voltage (its timing diagram is shown in FIG. 1 ). Figure 2aThe first light emitting device D1 is equivalent to a wire, in which current can be transmitted, so that the current flows from the second power supply voltage terminal VSS to the first power supply voltage terminal VDD. A third resistor R3 is provided in the path, and the current size can be adjusted by setting the voltage of the first power supply terminal VDD and the second power supply voltage terminal VSS. The third resistor R3 can be burned out under the action of a large current (its schematic diagram is shown in FIG. Figure 3a As shown in the figure, the path between the first power supply voltage terminal VSS and the second node N2 is cut off. The second light emitting device D2 has unidirectional conductivity and plays a reverse cutoff role. The fourth resistor R4 remains intact, and the path remains good. Under normal circumstances, the display function can be realized. In this way, the difficulty of repairing pixel dark spots can be reduced, and even the effect of not needing repair can be achieved, thereby reducing the repair cost and improving production efficiency.

[0077] Figure 4 A schematic diagram of a structure of another pixel driving circuit provided in an embodiment of the present disclosure is shown in FIG. Figure 4 As shown, the pixel driving circuit further includes: a first sensing subcircuit 208 and a second sensing subcircuit 209. The first sensing subcircuit 208 is configured to compensate the voltage of the second node N2 using the voltage of the sensing signal terminal Sense in response to the second scanning signal; the second sensing subcircuit 209 is configured to compensate the voltage of the third node N3 using the voltage of the sensing signal terminal Sense in response to the second scanning signal.

[0078] Specifically, the first sensing sub-circuit 208 includes: a fourth transistor T4; the second sensing sub-circuit 209 includes: a fifth transistor T5; the gate of the fourth transistor T4 is connected to the second scanning signal terminal Gate2, the source is connected to the sensing signal terminal Sense, and the drain is connected to the second node N2; the gate of the fifth transistor T5 is connected to the second scanning signal terminal Gate2, the source is connected to the sensing signal terminal Sense, and the drain is connected to the third node N3.

[0079] The second scanning signal can control the fourth transistor T4 to turn on, and input the sensing signal of the sensing signal terminal Sense to the second node N2, so as to perform external compensation on the voltage of the second node N2, so as to avoid the voltage of the second node N2 being affected, and ensure that the first light-emitting device D1 reaches a preset brightness. The second scanning signal can also control the fifth transistor T5 to turn on, and input the sensing signal of the sensing signal terminal Sense to the third node N3, so as to perform external compensation on the voltage of the third node N3, so as to avoid the voltage of the third node N3 being affected, and ensure that the second light-emitting device D2 reaches a preset brightness.

[0080] In some embodiments, Figure 4As shown, the first repair sub-circuit 206 is also configured to cut off the path between the sensing signal terminal Sense and the second node N2 when a reverse current passes through the first light-emitting device D1; the second repair sub-circuit 207 is configured to cut off the path between the sensing signal terminal Sense and the third node N3 when a reverse current passes through the second light-emitting device D2.

[0081] Specifically, Figure 4 As shown, the first repair sub-circuit 206 also includes: a fifth resistor R5; the second repair sub-circuit 207 also includes: a sixth resistor R6; one end of the fifth resistor R5 is connected to the drain of the fourth transistor T4, and the other end is connected to the second node N2; one end of the sixth resistor R6 is connected to the drain of the fifth transistor T5, and the other end is connected to the third node N3.

[0082] The first repair subcircuit 206 may further include a fifth resistor R5 having a relatively large resistance, and the second repair subcircuit 207 may further include a sixth resistor R6 having a relatively large resistance. For example, the resistance of the fifth resistor R5 and the sixth resistor R6 may be 2000 ohms to 3000 ohms. The fifth resistor R5 may be connected between the fourth transistor T4 and the second node N2 (i.e., the anode of the first light-emitting device D1), and the sixth resistor R6 may be connected between the fifth transistor T5 and the third node N3 (i.e., the anode of the second light-emitting device D2). When a short circuit occurs in the first light-emitting device D1, causing a dark spot defect, the voltage of the sensing signal terminal Sense may be changed to a low-level voltage, and the voltage of the second power supply voltage terminal VSS may be changed to a high-level voltage (its timing diagram is shown in FIG. 1 ). Figure 4a The first light emitting device D1 is equivalent to a wire, in which current can be transmitted, so that the current flows from the second power supply voltage terminal VSS to the sensing signal terminal Sense. A fifth resistor R5 is provided in the path, and the current can be adjusted by setting the voltage of the sensing signal terminal Sense and the second power supply voltage terminal VSS. The fifth resistor R5 can be burned out under the action of a large current (its schematic diagram is shown in FIG. Figure 4b As shown in the figure, the path between the sensing signal terminal Sense and the second node N2 is cut off. The second light emitting device D2 has unidirectional conductivity and plays a reverse cutoff role. The sixth resistor R6 remains intact, and the path remains good. Under normal circumstances, the display function can be realized. In this way, the difficulty of repairing pixel dark spots can be reduced, and even the effect of not needing repair can be achieved, thereby reducing the repair cost and improving production efficiency.

[0083] Specifically, Figure 2 , Figure 3 and Figure 4As shown, the data writing subcircuit 201 includes: a first transistor T1; the first driving subcircuit 202 includes: a second transistor T2; the second driving subcircuit 203 includes: a third transistor T3; the gate of the first transistor T1 is connected to the first scanning signal terminal Gate1, the source is connected to the data signal terminal Data, and the drain is connected to the first node N1; the gate of the second transistor T2 is connected to the first node N1, the source is connected to the first power supply voltage terminal VDD, and the drain is connected to the second node N2; the gate of the third transistor T3 is connected to the first node T1, the source is connected to the first power supply voltage terminal VDD, and the drain is connected to the third node N3. The first storage subcircuit 204 includes: a first storage capacitor C1; the second storage subcircuit 205 includes: a second storage capacitor C2; one end of the first storage capacitor C1 is connected to the first node N1, and the other end is connected to the second node N2; one end of the second storage capacitor C2 is connected to the first node N1, and the other end is connected to the third node N3.

[0084] Figure 5 A schematic diagram of the structure of a resistor in a pixel driving circuit provided in an embodiment of the present disclosure, such as Figure 5 As shown, the first resistor R1 is formed by overlapping the first electrode 501a, the second electrode 502a of the first light-emitting device D1 and the first power signal line 504 connected to the first power voltage terminal VDD; the second resistor R2 is formed by overlapping the first electrode 501b, the second electrode 502b of the second light-emitting device D2 and the first power signal line 504 connected to the first power voltage terminal VDD.

[0085] In practical applications, the first light-emitting device D1 may include: a first electrode 501a and a second electrode 502a arranged opposite to each other, and a first light-emitting layer 503a between the first electrode 501a and the second electrode 502b. The first electrode 501a may be an anode, the second electrode 502a may be a cathode, and the first light-emitting layer 503a may emit light under the voltage drive of the anode and the cathode. The first electrode 501a may be made of a three-layer structure, namely, a first indium tin oxide layer ITO1 and a second indium tin oxide layer ITO2 arranged opposite to each other, and a metal layer between the first indium tin oxide layer ITO1 and the second indium tin oxide layer ITO2, which may specifically be an aluminum alloy.

[0086] During the preparation process, each film layer in the first light-emitting device D1 can be disconnected and set, wherein the first indium tin oxide layer ITO1 in the first electrode 501a can be overlapped with the first power signal line 504 through a via. Since the second electrode 502a is generally made of a transparent metal material, during the preparation process, the second electrode 502 can enter the fault, so that the second electrode 502 overlaps with the first indium tin oxide layer ITO1. At the same time, the second electrode extends toward the first driving transistor T2, and overlaps with the source of the first driving transistor T2 in the same overlapping manner as described above. When a dark spot occurs, the current flow in the first resistor R1 can be as follows: Figure 6 As shown, since the resistance of the first resistor R1 is relatively large, it will be burned out under the action of a large current, and its burning position can be as shown in FIG. Figure 7 As shown, it can also be the overlapping position of each film layer.

[0087] In this way, a plurality of film layers are overlapped to increase the resistance of the first resistor R1, so that the resistance of the first resistor R1 can reach the kilo-ohm level, so that it can be burned out by a large current, thereby repairing the dark spot defect.

[0088] It should be noted here that in the above description, only the first resistor R1 is used as an example. Other resistors for repair are provided in the pixel driving circuit. For example, the second electrode R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 can adopt the same overlapping method to achieve a resistance value of kilo-ohms, which will not be described in detail here.

[0089] In a second aspect, an embodiment of the present disclosure provides a display panel, Figure 8 A schematic diagram of a pixel arrangement structure in a display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 8 As shown, the display panel includes: a plurality of sub-pixels; each sub-pixel includes a pixel driving circuit as provided above. The first light-emitting device D1 and the second light-emitting device D2 in the same sub-pixel have the same color, and the first light-emitting device D1 in adjacent sub-pixels has a different color. The implementation principle and beneficial effects of the display panel provided in the embodiment of the present disclosure are the same as the implementation principle and beneficial effects of the pixel driving circuit provided in any of the above embodiments, and will not be described in detail here.

[0090] In a third aspect, an embodiment of the present disclosure provides a display device, which includes a display panel as provided in any of the above embodiments. The display device can specifically be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function. Its implementation principle and beneficial effects are the same as those of the above-mentioned display panel and pixel driving circuit, and will not be repeated here.

[0091] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A pixel driving circuit, characterized in that: The pixel driving circuit comprises: a data writing subcircuit, a first driving subcircuit, a second driving subcircuit, a first storage subcircuit, a second storage subcircuit, a first repairing subcircuit and a second repairing subcircuit; The data writing subcircuit is configured to write a data signal into a first node in response to a scan signal; the first node is a connection point between the data writing subcircuit, the first driving subcircuit, the second driving subcircuit, the first storage subcircuit, and the second storage subcircuit; The first driving subcircuit is configured to convert a voltage signal at the first power supply voltage terminal into a driving current in response to a voltage at the first node, and provide the driving current to a second node; the second node is a connection point between the first driving subcircuit, the first storage subcircuit, and the first electrode of the first light-emitting device; the first driving subcircuit comprises: a second transistor; the control electrode of the second transistor is connected to the first node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the second node; The second driving subcircuit is configured to convert the voltage signal of the first power supply voltage terminal into a driving current in response to the voltage of the first node, and provide the driving current to a third node; the third node is a connection point between the second driving subcircuit, the second storage subcircuit, and the first electrode of the second light-emitting device; the second driving subcircuit includes: a third transistor; the control electrode of the third transistor is connected to the first node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the third node; The first storage sub-circuit is configured to store voltages of the first node and the second node; The second storage sub-circuit is configured to store voltages of the first node and the third node; The first repair subcircuit is configured to cut off the path between the first power supply voltage terminal and the second node when a reverse current passes through the first light-emitting device; the first repair subcircuit includes: a first resistor, or a third resistor; one end of the first resistor is connected to the first power supply signal line connected to the first power supply voltage terminal, and the other end is connected to the first electrode of the second transistor; one end of the third resistor is connected to the second electrode of the second transistor, and the other end is connected to the first electrode of the first light-emitting device; The second repair subcircuit is configured to cut off the path between the first power supply voltage terminal and the third node when a reverse current flows through the second light-emitting device; the second repair subcircuit includes: a second resistor, or a fourth resistor; One end of the second resistor is connected to the first power signal line connected to the first power voltage end, and the other end is connected to the first pole of the third transistor; one end of the fourth resistor is connected to the second pole of the third transistor, and the other end is connected to the first pole of the second light-emitting diode.

2. The pixel driving circuit according to claim 1, characterized in that: The pixel driving circuit further includes: a first sensing sub-circuit and a second sensing sub-circuit; The first sensing sub-circuit is configured to compensate the voltage of the second node using the voltage of the sensing signal terminal in response to the second scanning signal; The second sensing sub-circuit is configured to compensate the voltage of the third node using the voltage of the sensing signal terminal in response to the second scanning signal.

3. The pixel driving circuit according to claim 2, characterized in that: The first sensing sub-circuit includes: a fourth transistor; the second sensing sub-circuit includes: a fifth transistor; The control electrode of the fourth transistor is connected to the second scanning signal terminal, the first electrode is connected to the sensing signal terminal, and the second electrode is connected to the second node; The control electrode of the fifth transistor is connected to the second scanning signal terminal, the first electrode is connected to the sensing signal terminal, and the second electrode is connected to the third node.

4. The pixel driving circuit according to claim 3, characterized in that: The first repair subcircuit is further configured to cut off the path between the sensing signal terminal and the second node when a reverse current flows through the first light-emitting device; The second repair sub-circuit is configured to cut off a path between the sensing signal terminal and the third node when a reverse current flows through the second light-emitting device.

5. The pixel driving circuit according to claim 4, characterized in that: The first repair sub-circuit further includes: a fifth resistor; the second repair sub-circuit further includes: a sixth resistor; One end of the fifth resistor is connected to the second electrode of the fourth transistor, and the other end is connected to the second node; One end of the sixth resistor is connected to the second electrode of the fifth transistor, and the other end is connected to the third node.

6. The pixel driving circuit according to claim 1, characterized in that: The data writing subcircuit includes: a first transistor; the first storage subcircuit includes: a first storage capacitor; the second storage subcircuit includes: a second storage capacitor; The control electrode of the first transistor is connected to the first scan signal terminal, the first electrode is connected to the data signal terminal, and the second electrode is connected to the first node; One end of the first storage capacitor is connected to the first node, and the other end is connected to the second node; One end of the second storage capacitor is connected to the first node, and the other end is connected to the third node.

7. The pixel driving circuit according to claim 1, characterized in that: The resistance of the first resistor and the second resistor is 1000 ohms to 3000 ohms.

8. A display panel, characterized in that: The display panel comprises: a plurality of sub-pixels; each of the sub-pixels comprises a pixel driving circuit as claimed in any one of claims 1 to 7.

9. The display panel according to claim 8, characterized in that: The first light-emitting device and the second light-emitting device in the same sub-pixel have the same color; The colors of the first light-emitting devices in adjacent sub-pixels are different.

10. A display device, characterized in that: The display device comprises the display panel according to claim 8 or 9.

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