Pixel circuit, display panel and display device

Abstract

The present invention discloses a pixel circuit, a display panel and a display device, wherein the pixel circuit comprises: a driving circuit electrically connected to the anode of a first light-emitting element; the driving circuit is used to provide a driving signal to the first light-emitting element to control the first light-emitting element to emit light; a detection circuit electrically connected to the cathode of the first light-emitting element; the detection circuit is used to output a detection signal according to the cathode potential of the first light-emitting element; a repair circuit is electrically connected to the driving circuit and the second light-emitting element respectively; the repair circuit is used to receive a repair signal, and control the driving signal provided to the second light-emitting element according to the repair signal to control the second light-emitting element to emit light; wherein the repair signal is associated with the detection signal; the second light-emitting element and the first light-emitting element have different light-emitting times. The technical solution provided by the present invention can solve the problem that the light-emitting element in the pixel circuit is damaged and affects the display effect, and improve the yield of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a pixel circuit, a display panel, and a display device. Background Art

[0002] With the rapid development of display technology, the requirements for display quality are getting higher and higher. The light-emitting elements in the pixel circuit usually use micro light-emitting diodes (Micro LED), which makes the display panel have many advantages such as high contrast, fast response, wide viewing angle, wide color gamut, high brightness, low power consumption, long life, good stability, etc. Micro LED display technology is expected to become the next generation of mainstream display technology.

[0003] However, due to the small size of Micro LED, Micro LED is easily damaged during the bonding process with the driving substrate and fails to light up, thus affecting the display effect of the display panel. Summary of the invention

[0004] The present invention provides a pixel circuit, a display panel and a display device to solve the problem that the light emitting element in the pixel circuit is damaged and affects the display effect, thereby improving the yield of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a pixel circuit, including: a driving circuit, a detection circuit, a repair circuit, a first light-emitting element, and a second light-emitting element;

[0006] The driving circuit is electrically connected to the anode of the first light-emitting element; the driving circuit is used to provide a driving signal to the first light-emitting element to control the first light-emitting element to emit light;

[0007] The detection circuit is electrically connected to the cathode of the first light-emitting element; the detection circuit is used to output a detection signal according to the cathode potential of the first light-emitting element;

[0008] The repair circuit is electrically connected to the driving circuit and the second light-emitting element respectively; the repair circuit is used to receive a repair signal and control the driving signal provided to the second light-emitting element according to the repair signal to control the second light-emitting element to emit light;

[0009] The repair signal is associated with the detection signal; and the light emitting time of the second light emitting element is different from that of the first light emitting element.

[0010] In a second aspect, an embodiment of the present invention further provides a display panel, comprising: a display area;

[0011] The display area includes a plurality of pixel circuits as described in the first aspect arranged in an array.

[0012] In a third aspect, an embodiment of the present invention further provides a display device, comprising the display panel as described in the second aspect.

[0013] The technical solution of the present invention is to provide a driving signal to the first light-emitting element by setting a driving circuit to be electrically connected to the anode of the first light-emitting element, so as to control the first light-emitting element to emit light. The detection circuit is electrically connected to the cathode of the first light-emitting element, and can output a detection signal according to the cathode potential of the first light-emitting element. The cathode potential corresponding to the first light-emitting element when it is working normally is different from the cathode potential corresponding to the abnormality, so that the detection signal output by the detection circuit according to the cathode potential is also different; the repair circuit is electrically connected to the driving circuit and the second light-emitting element respectively, and the repair signal received by the repair circuit is associated with the detection signal, that is, the corresponding repair signal will be different if the detection signal is different. In this way, when the first light-emitting element is working normally, the repair signal corresponding to the detection signal output by the detection circuit can control the second light-emitting element not to emit light, and when the first light-emitting element is abnormal, the repair signal corresponding to the detection signal output by the detection circuit can enable the repair circuit to control the driving signal provided to the second light-emitting element to control the second light-emitting element to emit light, so as to ensure the normal operation of the pixel circuit, meet the display requirements, improve the display effect, and thus improve the yield of the display panel including the pixel circuit.

[0014] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, although the drawings described below are some specific embodiments of the present invention, for those skilled in the art, the basic concepts of the device structure, driving method and manufacturing method disclosed and suggested by the various embodiments of the present invention can be expanded and extended to other structures and drawings, and there is no doubt that these should be within the scope of the claims of the present invention.

[0016] Figure 1 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0018] Figure 3 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0019] Figure 4 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0020] Figure 5 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0021] Figure 6 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0022] Figure 7 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0023] Figure 8 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0024] Fig. 9 for Figure 8 A driving timing diagram when the first light emitting element is working normally;

[0025] Fig.10 for Figure 8 A driving timing diagram when the first light emitting element is abnormal;

[0026] Fig.11 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0027] Fig.12 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0028] Fig.13 for Fig.12 A driving timing diagram when the first light emitting element is working normally;

[0029] Fig.14 for Fig.12 A driving timing diagram when the first light emitting element is abnormal;

[0030] Fig.15 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0031] Fig.16 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described through implementation methods with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the basic concepts disclosed and suggested by the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the scope of protection of the present invention.

[0033] Figure 1 A schematic diagram of a pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the pixel circuit 10 includes: a driving circuit 11, a detection circuit 12, a repair circuit 13, a first light-emitting element 14 and a second light-emitting element 15; the driving circuit 11 is electrically connected to the anode of the first light-emitting element 14; the driving circuit 11 is used to provide a driving signal to the first light-emitting element 14 to control the first light-emitting element 14 to emit light; the detection circuit 12 is electrically connected to the cathode of the first light-emitting element 14; the detection circuit 12 is used to output a detection signal according to the cathode potential of the first light-emitting element 14; the repair circuit 13 is electrically connected to the driving circuit 11 and the second light-emitting element 15 respectively; the repair circuit 13 is used to receive a repair signal, and control the driving signal provided to the second light-emitting element 15 according to the repair signal, so as to control the second light-emitting element 15 to emit light; wherein the repair signal is associated with the detection signal; the second light-emitting element 15 has a different light-emitting time from the first light-emitting element 14.

[0034] Among them, the first light-emitting element 14 and the second light-emitting element 15 can be an organic light-emitting diode (OLED), a sub-millimeter light-emitting diode (Mini LED) or a micro light-emitting diode (Micro LED), which is not specifically limited in the embodiment of the present invention and can be set according to actual needs. In addition, the first light-emitting element 14 and the second light-emitting element 15 include but are not limited to a red light-emitting element, a green light-emitting element, a blue light-emitting element, a white light-emitting element, a yellow light-emitting element, a cyan light-emitting element or a magenta light-emitting element, which is not specifically limited in the embodiment of the present invention.

[0035] It is understandable that the driving circuit 11 may be an existing 2T1C circuit, a 7T1C circuit or any other circuit capable of driving the first light emitting element 14 to emit light, and the embodiment of the present invention does not specifically limit this.

[0036] Specifically, when the driving circuit 11 provides a driving signal to the first light-emitting element 14 to control the first light-emitting element 14 to emit light, the detection circuit 12 detects the cathode potential of the first light-emitting element 14 in real time. It can be understood that the cathode potential of the first light-emitting element 14 will be different depending on whether the first light-emitting element 14 emits light normally. For example, when the first light-emitting element 14 emits light, the driving signal provided by the driving circuit 11 can be transmitted to its cathode through the first light-emitting element 14, so that the potential of its cathode is high. When the first light-emitting element 14 does not emit light, the driving signal provided by the driving circuit 11 cannot be transmitted to its cathode through the first light-emitting element 14. At this time, the cathode potential of the first light-emitting element 14 is low. In this way, the detection circuit 12 can determine whether the first light-emitting element 14 is emitting light normally based on detecting the cathode potential of the first light-emitting element 14, and output a corresponding detection signal. Since the repair signal is associated with the detection signal, when the detection signal corresponds to the normal emission of the first light-emitting element 14, the repair circuit 13 can control the second light-emitting element 15 to stop emitting light according to the repair signal after receiving the repair signal. When the detection signal corresponds to the first light-emitting element 14 not emitting light normally or unable to emit light, the repair circuit 13 can control the second light-emitting element 15 to emit light according to the repair signal after receiving the repair signal, thereby ensuring the normal emission of the pixel circuit, so as to meet the display requirements and improve the yield of the display panel including the pixel circuit 10.

[0037] In the embodiment of the present invention, the drive circuit is electrically connected to the anode of the first light-emitting element to provide a drive signal to the first light-emitting element, and the first light-emitting element is controlled to emit light. The detection circuit is electrically connected to the cathode of the first light-emitting element, and can output a detection signal according to the cathode potential of the first light-emitting element. The cathode potential corresponding to the first light-emitting element when it is working normally is different from the cathode potential corresponding to the abnormality, so that the detection signal output by the detection circuit according to the cathode potential is also different; the repair circuit is electrically connected to the drive circuit and the second light-emitting element respectively, and the repair signal received by the repair circuit is associated with the detection signal, that is, the corresponding repair signal will be different if the detection signal is different. In this way, when the first light-emitting element is working normally, the repair signal corresponding to the detection signal output by the detection circuit can control the second light-emitting element not to emit light, and when the first light-emitting element is abnormal, the repair signal corresponding to the detection signal output by the detection circuit can enable the repair circuit to control the drive signal provided to the second light-emitting element to control the second light-emitting element to emit light, so as to ensure the normal operation of the pixel circuit, meet the display requirements, improve the display effect, and thus improve the yield of the display panel containing the pixel circuit.

[0038] Optional, Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 2As shown, the detection circuit 12 includes a first voltage divider module 121, a second voltage divider module 122 and an amplifying module 123; the first voltage divider module 121 is electrically connected to the cathode of the first light-emitting element 14 and the first power supply terminal PVEE, respectively, and the first voltage divider module 121 and the cathode of the first light-emitting element 14 are electrically connected to the first node N1; the first voltage divider module 121 is used to divide the first power signal Pvee of the first power supply terminal PVEE; the second voltage divider module 122 is electrically connected to the first node N1 and the amplifying module 123, respectively; the second voltage divider module 122 is used to divide the potential of the first node N1, and output the voltage divider signal to the amplifying module 123; the amplifying module 123 is used to output the detection signal after gain adjustment of the voltage divider signal.

[0039] Specifically, the first voltage divider module 121 and the second voltage divider module 122 may have the same or different structures, for example, both are resistors or transistors, which is not specifically limited in the embodiment of the present invention. When the first light-emitting element 14 works normally, the driving circuit 11 provides a driving signal, that is, a driving current, to the first light-emitting element 14 to drive the first light-emitting element 14 to emit light. At this time, the potential corresponding to the first node N1 may be a high level, and the potential of the first node N1 is transmitted to the amplification module 123 through the second voltage divider module 122, so that the detection signal output by the amplification module 123 is the first detection signal. When the first light-emitting element 14 works abnormally, the potential of the first node N1 is the voltage value after the first voltage divider module 121 divides the first power signal Pvee of the first power terminal PVEE, for example, it is a low level, and is transmitted to the amplification module 123 after voltage division by the second voltage divider module 122, so that the amplification module 123 performs gain adjustment on the voltage divided signal, and the output detection signal is the second detection signal. It can be understood that the voltage values ​​of the first detection signal and the second detection signal are different, and then when the detection signal is associated with the repair signal, the corresponding repair signal received by the reset circuit 13 when the first light-emitting element 14 works normally and abnormally will not be different. When the first light-emitting element 14 is abnormal, the repair circuit 13 can control the driving signal provided to the second light-emitting element 15 according to the repair signal, and then control the second light-emitting element 15 to emit light, so as to meet the display requirements and ensure the display effect.

[0040] It is understandable that the amplifying module 123 can perform gain adjustment on the voltage-dividing signal to improve the detection accuracy. The amplifying module 123 can include any existing amplifying circuit, which is not specifically limited in the embodiment of the present invention and can be set according to actual needs.

[0041] Optional, Figure 3 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 3As shown, the first voltage divider module 121 includes a first transistor T1, a first electrode of the first transistor T1 is electrically connected to the cathode of the first light-emitting element 14, a second electrode of the first transistor T1 is electrically connected to the first power supply terminal PVEE, and a gate of the first transistor T1 is electrically connected to the first scan signal terminal S1; during at least part of the time when the first light-emitting element 14 or the second light-emitting element 15 is emitting light, the first scan signal s1 of the first scan signal terminal S1 controls the first transistor T1 to be turned on.

[0042] Among them, the first transistor T1 can be an N-channel transistor or a P-channel transistor. The embodiment of the present invention does not specifically limit this and can be set according to actual needs. When the first transistor T1 is a P-channel transistor, when the first scanning signal s1 provided by the first scanning signal terminal S1 is at a low level, the first transistor T1 can be controlled to be turned on, and when the first scanning signal s1 provided by the first scanning signal terminal S1 is at a high level, the first transistor T1 can be controlled to be turned off. When the first transistor T1 is an N-channel transistor, when the first scanning signal s1 provided by the first scanning signal terminal S1 is at a high level, the first transistor T1 can be controlled to be turned on, and when the first scanning signal s1 provided by the first scanning signal terminal S1 is at a low level, the first transistor T1 can be controlled to be turned off. Figure 3 The first transistor T1 is exemplarily shown to be a P-channel transistor, but is not limited thereto.

[0043] Specifically, in the light-emitting stage of the first light-emitting element 14 or the second light-emitting element 15, the first scanning signal s1 provided by the first scanning signal terminal S1 controls the first transistor T1 to be in the on state. It can be understood that the first transistor T1 usually has a certain internal resistance, and can divide the first power signal Pvee of the first power terminal PVEE, so that the potential of the first node N1 corresponding to the first light-emitting element 14 is different during normal operation and abnormal operation, and thus the potential of the first node N1 can be divided by the second voltage divider module 122 and adjusted by the gain of the amplification module 123 to output a corresponding detection signal, thereby ensuring the accuracy of the detection circuit 12 in detecting the potential of the first node N1.

[0044] Optional, continue to refer to Figure 3 As shown, the second voltage divider module 122 includes a second transistor T2, a first electrode of the second transistor T2 is electrically connected to the first node N1, a second electrode of the second transistor T2 is electrically connected to the amplification module 123, and a gate of the second transistor T2 is electrically connected to the second scan signal terminal S2; during at least part of the time when the first light-emitting element 14 or the second light-emitting element 15 is emitting light, the second scan signal s2 of the second scan signal terminal S1 controls the second transistor T1 to turn on.

[0045] Wherein, the second transistor T2 can be an N-channel transistor or a P-channel transistor, which is not specifically limited in the embodiment of the present invention and can be set according to actual needs. When the second transistor T2 is a P-channel transistor, when the second scanning signal s2 provided by the second scanning signal terminal S2 is at a low level, the second transistor T2 can be controlled to be turned on, and when the second scanning signal s2 provided by the second scanning signal terminal S2 is at a high level, the second transistor T2 can be controlled to be turned off. When the second transistor T2 is an N-channel transistor, when the second scanning signal s2 provided by the second scanning signal terminal S2 is at a high level, the second transistor T2 can be controlled to be turned on, and when the second scanning signal s2 provided by the second scanning signal terminal S2 is at a low level, the second transistor T2 can be controlled to be turned off. Figure 3 The second transistor T2 is exemplarily shown to be a P-channel transistor, but is not limited thereto.

[0046] Specifically, in the light-emitting stage of the first light-emitting element 14 or the second light-emitting element 15, the second scanning signal s2 provided by the second scanning signal terminal S2 controls the second transistor T2 to be in the on state. It can be understood that the second transistor T2 usually has a certain internal resistance, which can divide the potential of the first node N1 to ensure that the potential of the first node N1 can be reliably transmitted to the amplification module 123 after the voltage division of the second transistor T2, thereby enabling the amplification module 123 to output a detection signal according to the voltage division signal, thereby ensuring the accuracy of the detection signal.

[0047] Optional, continue to refer to Figure 3 As shown, the first scan signal terminal S1 is multiplexed into the second scan signal terminal S2.

[0048] Specifically, in the light emitting stage of the first light emitting element 14 or the second light emitting element 15, the first transistor T1 and the second transistor T2 are both in the on state, and the first transistor T1 and the second transistor T2 can both be P-channel transistors or N-channel transistors. At this time, the first scan signal terminal S1 is multiplexed as the second scan signal terminal S2, which can reduce the number of scan signal terminals and the number of scan signal lines, simplify the line layout, facilitate narrow frame design, and help improve resolution.

[0049] In other embodiments, optionally, Figure 4 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the first voltage divider module 121 includes a first resistor R1, one end of the first resistor R1 is electrically connected to the cathode of the first light emitting element 14 at the first node N1, and the other end of the first resistor R1 is electrically connected to the first power supply terminal PVEE.

[0050] The resistance value of the first resistor R1 can be any value, which is not specifically limited in the implementation of the present invention and can be set according to actual needs. The first resistor R1 can divide the first power signal Pvee provided by the first power terminal PVEE. When the first light-emitting element 14 works normally, the potential of the corresponding first node N1 is U R +U PVEE , where U R is the voltage drop of the first resistor R1, U PVEE is the voltage value of the first power supply terminal PVEE, and when the first light emitting element 14 works abnormally, the potential of the corresponding first node N1 is U PVEE -U R In this way, through the first resistor R1, the detection module 12 can determine whether the first light-emitting element 14 is working normally by detecting the potential of the first node N1, thereby outputting a corresponding detection signal, and then the repair circuit 13 controls the working state of the second light-emitting element 15 according to the repair signal to ensure a better display effect.

[0051] It should be noted that the first voltage dividing module 121 and the second voltage dividing module 122 include but are not limited to Figure 3 and Figure 4 In the structure shown, unless otherwise specified, the following embodiments are described by taking the first voltage dividing module 121 and the second voltage dividing module 122 as transistors as an example.

[0052] Optional, Figure 5 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the amplification module 123 includes an operational amplifier A, a first capacitor C1 and a second resistor R2; the in-phase input terminal of the operational amplifier A is electrically connected to the output terminal of the second voltage divider module 122, and the inverting input terminal of the operational amplifier A is electrically connected to the first power supply terminal PVEE; the second resistor R2 is electrically connected between the in-phase input terminal of the operational amplifier A and the output terminal OUT of the operational amplifier A; the first capacitor C1 is connected in parallel with the second resistor R2.

[0053] Specifically, the gain adjustment amplification factor of the voltage-dividing signal input to the in-phase input terminal of the operational amplifier A is related to the resistance value of the second resistor R2. Since the inverting input terminal of the operational amplifier A is electrically connected to the first power terminal PVEE, the operational amplifier A can be a differential amplifier. When the first light-emitting element 14 works normally, at this time, the voltage-dividing signal input to the in-phase input terminal of the operational amplifier A is usually greater than the voltage value of the first power signal Pvee provided by the first power terminal PVEE. The operational amplifier A will amplify the gain of the voltage-dividing signal input to the in-phase input terminal and output the detection signal after the gain is amplified by the operational amplifier A, for example, the detection signal is a high level. When the first light-emitting element 14 is abnormal, the potential of the first node N1 is the voltage value after the first power signal Pvee of the first power terminal PVEE is divided, that is, the voltage value of the potential of the first node N1 is less than the voltage value of the first power signal Pvee, so that the operational amplifier A cannot perform gain adjustment on the voltage-dividing signal at the in-phase input terminal. At this time, the detection signal output by the output terminal OUT is a low level. In this way, the amplification module 123 can output different detection signals according to different potentials of the first node N1 to reflect different working states of the first light-emitting element 14. It can be understood that the first capacitor C1 can play a filtering role to avoid the influence of noise signals, ensure the accuracy and stability of the detection signal output by the output terminal OUT, and improve the detection accuracy.

[0054] Optional, Figure 6 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the driving circuit 11 includes a driving transistor DT and a data writing module 111; the data writing module 111 is electrically connected to the driving transistor DT; the data writing module 111 is used to control the data signal to be written into the gate of the driving transistor DT; the second electrode of the driving transistor DT is electrically connected to the anode of the first light-emitting element 14 at the second node N2; the driving transistor DT is used to provide a driving signal to the first light-emitting element 14 according to the data signal.

[0055] For example, Figure 6As shown, the data writing module 111 can be directly electrically connected to the gate of the driving transistor DT to write a data signal to the gate of the driving transistor DT. The data writing module 111 can include a data writing transistor T0, a first electrode of the data writing transistor T0 is electrically connected to the data signal terminal DATA, and a second electrode of the data writing transistor T0 is electrically connected to the gate of the driving transistor DT. The scanning signal Scan can control the data writing transistor T0 to be in a conducting state, and write the data signal Vdata provided by the data signal terminal DATA to the gate of the driving transistor DT, so that the driving transistor DT can provide a driving signal to the first light-emitting element 14 according to the data signal Vdata. The storage capacitor Cst is used to store the data signal Vdata written to the gate of the driving transistor DT to ensure the stable light emission of the first light-emitting element 14.

[0056] In other embodiments, Figure 7 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, Figure 7 The circuit structure diagram of the pixel circuit as a 7TIC (i.e., including six switch transistors, a drive transistor DT, and a storage capacitor Cst) circuit is shown as an example. It can be understood that the six switch transistors in the pixel circuit are turned on or off under the control of the corresponding scan signals (Scan1, Scan2, Emit) to control the on and off of the transmission paths of the data signal Vdata, the initialization signal, and the reset signal Vref, and to control the time of providing the driving current to the light-emitting element 14. The data writing module 111 is electrically connected to the first pole of the driving transistor DT, and a threshold compensation transistor is usually provided between the second pole and the gate of the driving transistor DT to compensate for the threshold voltage of the driving transistor DT. In this way, when the positive power signal Pvdd of the second power supply terminal PVDD is transmitted to the first pole of the driving transistor DT, at the same time, the first power signal Pvee written to the cathode of the first light-emitting element 14 is a negative power signal, and a current path is formed from the positive power signal to the negative power signal, so that the driving transistor DT generates a driving current according to the voltage difference between the data signal written to its gate and the positive power signal Pvdd of its first pole, and drives the first light-emitting element 14 to emit light.

[0057] It should be noted that the driving transistor DT may be a P-channel transistor or an N-channel transistor, which is not specifically limited in the embodiment of the present invention and may be set according to actual requirements. Figure 6 and Figure 7 The driving transistor DT is exemplarily shown to be a P-channel transistor, but is not limited thereto.

[0058] It is worth noting that the structure of the pixel circuit includes but is not limited to Figure 6 and Figure 7The structure shown in the figure can be set according to actual needs. In the case of no special instructions, the following embodiments are based on the pixel circuit. Figure 6 The structure shown is used as an example for explanation.

[0059] Optional, Figure 8 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the repair circuit 13 includes a switch module 131 and a control module 132; the switch module 131 is electrically connected to the repair signal terminal V1 and the control module 132 respectively; the switch module 131 is used to control the transmission path of the repair signal v1 of the repair signal terminal V1 to the control module 132; the control module 132 is used to provide a driving signal to the second light-emitting element 15 according to the repair signal v1, so as to control the second light-emitting element 15 to emit light.

[0060] Specifically, the switch module 131 can be a control module 132 that controls the transmission path of the repair signal v1 from the repair signal terminal V1 to the control module 132 to be always on, or adjusted according to the light-emitting state of the second light-emitting element 15, that is, when the second light-emitting element 15 needs to emit light, the transmission path of the repair signal v1 from the repair signal terminal V1 to the control module 132 to be always on, and when the second light-emitting element 15 does not need to emit light, the transmission path of the repair signal v1 from the repair signal terminal V1 to the control module 132 to be disconnected. The embodiment of the present invention does not specifically limit this, and can be set according to actual needs. When the transmission path of the repair signal v1 from the repair signal terminal V1 to the control module 132 is on, the repair signal v1 is transmitted to the control module 132, and the control module 132 can provide a driving signal to the second light-emitting element 15 according to the repair signal v1 to control the second light-emitting element 15 to emit light, so that when the first light-emitting element 14 is abnormal, the second light-emitting element 15 can be controlled to emit light to ensure the normal operation of the pixel circuit 10, so as to meet the display requirements and improve the display effect.

[0061] In an optional embodiment, continue to refer to Figure 8As shown, the switch module 131 includes a third transistor T3, and the control module 132 includes a fourth transistor T4; the first electrode of the third transistor T3 is electrically connected to the repair signal terminal V1, the second electrode of the third transistor T3 is electrically connected to the gate of the fourth transistor T4, and the gate of the third transistor T3 is electrically connected to the third scan signal terminal S3; the first electrode of the fourth transistor T4 is electrically connected to the second node N2, and the second electrode of the fourth transistor T4 is electrically connected to the anode of the second light-emitting element 15. When the first light-emitting element 14 emits light, the third scan signal s3 of the third scan signal terminal S3 controls the third transistor T3 to be turned on, and the repair signal v1 of the repair signal terminal V1 controls the fourth transistor T4 to be turned off; when the second light-emitting element 15 emits light, the third scan signal s3 of the third scan signal terminal S3 controls the third transistor T3 to be turned on, and the repair signal v1 of the repair signal terminal V1 controls the fourth transistor T4 to be turned on.

[0062] The third transistor T3 and the fourth transistor T4 may be P-channel transistors or N-channel transistors, which are not specifically limited in the embodiment of the present invention and may be set according to actual needs. Figure 8 It is exemplarily shown that the third transistor T3 and the fourth transistor T4 are both P-channel transistors.

[0063] Specifically, Fig. 9 for Figure 8 The driving timing diagram of the first light emitting element when it is working normally, Fig.10 for Figure 8 The driving timing diagram when the first light-emitting element is abnormal, combined with Figure 8 to Figure 10 As shown, in the light-emitting stage, when the first light-emitting element 14 works normally, the detection circuit 12 detects the potential of the first node N1 and outputs a detection signal Vout (for example, Vout is a high level VGH). Since the detection signal Vout is associated with the repair signal v1, the repair signal v1 can also be a high level VGH at this time, and when the third scanning signal s3 at the third scanning signal terminal S3 controls the third transistor T3 to be turned on, the repair signal v1 is transmitted to the fourth transistor T4, and the fourth transistor T4 is controlled to be turned off, so that the driving transistor DT cannot provide a driving signal to the second light-emitting element 15, thereby making the second light-emitting element 15 unable to emit light. However, when the first light-emitting element 14 is normal or abnormal, the detection circuit 12 detects the potential of the first node N1 and outputs a detection signal Vout (for example, Vout is a low level VGL). At this time, the repair signal v1 can also be a low level VGL, and when the third scanning signal s3 at the third scanning signal terminal S3 controls the third transistor T3 to be turned on, the repair signal v1 is transmitted to the fourth transistor T4 to control the fourth transistor T4 to be turned on, so that the driving transistor DT provides a driving signal to the second light-emitting element 15 to drive the second light-emitting element 15 to emit light, so as to ensure the normal light emission of the pixel circuit 10, meet the display requirements, and improve the display effect.

[0064] Understandably, reference Fig. 9 As shown, the scan signal Scan1 provides an enable level (i.e., a low level VGL) to the data write transistor T0 in a partial time period of the light-emitting stage, controls the data write transistor T0 to be turned on, so that the data signal Vdata is written into the gate of the driving transistor DT and then stored in the storage capacitor Cst. In the subsequent light-emitting stage, the normal light-emitting of the first light-emitting element 14 can still be guaranteed.

[0065] Optional, continue to refer to Figure 8 As shown, the repair circuit 13 further includes a storage module 133; the storage module 133 is used to store the repair signal v1. The storage module 133 can be a capacitor. After the repair signal v1 is transmitted to the gate of the fourth transistor T4 through the third transistor T3, it can be stored in the storage module 133. In this way, the third scanning signal s3 can also provide an enable level (i.e., a low level VGL) to the third transistor T3 during a part of the light-emitting phase, and control the third transistor T3 to turn on. In the subsequent light-emitting phase, the repair signal v1 can always control the fourth transistor T4 to turn on or off.

[0066] Optional, continue to refer to Figure 8 As shown, one end of the storage module 133 is coupled between the switch module 131 and the control module 132, and the other end of the storage module 133 is electrically connected to the second node N2. It can also be understood that no matter whether the driving circuit 11 drives the first light-emitting element 14 to emit light or drives the second light-emitting element 15 to emit light, the storage module 133 can store the repair signal v1 written to the gate of the fourth transistor T4, so as to ensure that when the third transistor T3 is turned off, the fourth transistor T4 can still be continuously and stably controlled to be turned on or off.

[0067] In other embodiments, optionally, Fig.11 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Fig.11 As shown, one end of the storage module 133 is coupled between the switch module 131 and the control module 132 , and the other end of the storage module 133 is electrically connected to the third power supply terminal VDD.

[0068] Specifically, the third power supply terminal VDD may be any fixed power supply signal terminal, which is not specifically limited in the embodiment of the present invention. Figure 8 The second power terminal PVDD shown can be reused as the third power terminal VDD, which can reduce the number of power signal lines and help simplify the circuit.

[0069] It is worth noting that, unless otherwise specified, the following embodiments all take the storage module 133 as Fig.11 The structure shown is used as an example for explanation.

[0070] In another alternative embodiment, Fig.12 A structural diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Fig.12 As shown, the switch module 131 includes a third transistor T3, and the control module 132 includes a fifth transistor T5 and a sixth transistor T6; the first electrode of the third transistor T3 is electrically connected to the repair signal terminal V1, the second electrode of the third transistor T3 is electrically connected to the gate of the fifth transistor T5, and the gate of the third transistor T3 is electrically connected to the third scan signal terminal S3. The first electrode of the fifth transistor T5 is electrically connected to the data signal terminal DATA, and the second electrode of the fifth transistor T5 is electrically connected to the gate of the sixth transistor T6; the first electrode of the sixth transistor T6 is electrically connected to the second power supply terminal PVDD, and the second electrode of the sixth transistor T6 is electrically connected to the anode of the second light-emitting element 15; the cathode of the second light-emitting element 15 is electrically connected to the first power supply terminal PVEE; the polarity of the first power signal Pvee of the first power supply terminal PVEE is different from the polarity of the second power signal Pvdd of the second power supply terminal PVDD. When the first light-emitting element 14 emits light, the third scan signal s3 of the third scan signal terminal S3 controls the third transistor T3 to turn on, and the repair signal v1 of the repair signal terminal V1 controls the fifth transistor T5 to turn off; when the second light-emitting element 15 emits light, the third scan signal s3 of the third scan signal terminal S3 controls the third transistor T3 to turn on, and the repair signal v1 of the repair signal terminal V1 controls the fifth transistor T5 to turn on.

[0071] The fifth transistor T5 and the sixth transistor T6 may be P-channel transistors or N-channel transistors, which are not specifically limited in the embodiment of the present invention and may be set according to actual needs. Fig.12 It is exemplarily shown that the fifth transistor T5 and the sixth transistor T6 are both P-channel transistors.

[0072] Specifically, Fig.13 for Fig.12 The driving timing diagram of the first light emitting element when it is working normally, Fig.14 for Fig.12 The driving timing diagram when the first light-emitting element is abnormal, combined with Figure 12 to Figure 14As shown, in the light-emitting stage, when the first light-emitting element 14 works normally, the detection circuit 12 detects the potential of the first node N1 and outputs a detection signal Vout (for example, Vout is a high level VGH). Since the detection signal Vout is associated with the repair signal v1, the repair signal v1 can also be a high level VGH at this time, and when the third scan signal s3 at the third scan signal terminal S3 controls the third transistor T3 to be turned on, the repair signal v1 is transmitted to the fifth transistor T5, and the fifth transistor T5 is controlled to be turned off, so that the data signal Vdata at the data signal terminal DATA cannot be written to the gate of the sixth transistor T6, so that the sixth transistor T6 is in a closed state and cannot drive the second light-emitting element 15 to emit light. However, when the first light-emitting element 14 is normal or abnormal, the detection circuit 12 detects the potential of the first node N1 and outputs the detection signal Vout (for example, Vout is a low level VGL). At this time, the repair signal v1 can also be a low level VGL, and when the third scan signal s3 of the third scan signal terminal S3 controls the third transistor T3 to be turned on, the repair signal v1 is transmitted to the fifth transistor T5, and the fifth transistor T5 is controlled to be turned on, so that the data signal Vdata of the data signal terminal DATA is written to the gate of the sixth transistor T6, and the sixth transistor T6 is controlled to be turned on. At this time, the second power signal Pvdd provided by the second power terminal PVDD can be a positive power signal, and the first power signal Pvee provided by the first power terminal PVEE can be a negative power signal. A current path is formed from the positive power signal to the negative power signal, so that the sixth transistor T6 generates a driving current according to the voltage difference between the data signal Vdata written to its gate and the positive power signal Pvdd of its first pole, and drives the second light-emitting element 15 to emit light. In this way, the normal light emission of the pixel circuit 10 is ensured, the display requirements are met, and the display effect is improved.

[0073] Optional, continue to refer to Fig.12 As shown, the data writing module 111 includes a data writing transistor T0, a first electrode of the data writing transistor T0 is electrically connected to the data signal terminal DATA, and a second electrode of the data writing transistor T0 is electrically connected to the gate of the driving transistor DT; the channel type of the data writing transistor T0 is opposite to the channel type of the fifth transistor T5.

[0074] Specifically, by setting the channel type of the data writing transistor T0 to be opposite to the channel type of the fifth transistor T5, the repair signal v1 of the repair signal terminal V1 can be multiplexed as a scanning signal for controlling the data writing transistor T0 to be turned on or off, so as to reduce the number of scanning signal lines and simplify the circuit structure. At the same time, it can be ensured that the first light-emitting element 14 and the second light-emitting element 15 will not emit light at the same time, avoiding affecting the display effect.

[0075] Optional, continue to refer to Fig.12As shown, the data writing transistor T0 includes an N-channel transistor, and the fifth transistor T5 includes a P-channel transistor. In this way, in the light-emitting stage, when the first light-emitting element 14 works normally, the repair circuit 13 can receive the repair signal v1 as a high level VGH, control the data writing transistor T0 to be turned on, so that the data signal Vdata of the data signal terminal DATA is written to the gate of the driving transistor DT, and the repair signal v1 can be transmitted to the fifth transistor T5 through the third transistor T3, control the fifth transistor T5 to be turned off, avoid the data signal Vdata from being written to the sixth transistor T6, and then avoid driving the second light-emitting element 15 to emit light. On the contrary, in the light-emitting stage, when the first light-emitting element 14 is abnormal, the repair signal v1 is a low level VGL, and while controlling the data writing transistor T0 to be turned off, the sixth transistor T6 can be controlled to be turned on, thereby driving the second light-emitting element 15 to emit light.

[0076] Based on the same inventive concept, an embodiment of the present invention further provides a display panel, Fig.15 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention is shown in FIG. Fig.15 As shown, the display panel 100 includes a display area AA; the display area AA includes a plurality of pixel circuits 10 arranged in an array as in any of the above embodiments.

[0077] It is understandable that the light emitting colors of the light emitting elements in adjacent pixel circuits 10 may be the same or different, and the present invention does not impose any specific limitation on this, and it may be set according to actual needs.

[0078] Optional, continue to refer to Fig.15 As shown, the display panel 100 also includes: a non-display area NA surrounding the display area AA; the non-display area NA includes a driver chip setting area 101; the driver chip setting area 101 is used to set the driver chip 20; the display area AA also includes multiple detection signal lines L1 and repair signal lines L2; ​​the detection circuit 12 of the pixel circuit 10 located in the same row or column is electrically connected to the same detection signal line L1, and the repair circuit 13 of the pixel circuit 10 located in the same row or column is electrically connected to the same repair signal line L2; the driver chip 20 is electrically connected to each detection signal line L1 and each repair signal line L2 respectively; the driver chip 20 is used to provide a repair signal to each repair signal line L2 according to the detection signal transmitted by each detection signal line L1.

[0079] For example, Fig.12 The detection circuits 12 of the pixel circuits 10 in the same row are shown to be electrically connected to the same detection signal line L1, and the detection circuits 12 of the pixel circuits 10 in the same row are electrically connected to the same repair signal line L2, but the present invention is not limited thereto. The driver chip setting area 101 may be located in any non-display area NA of the display panel 100. Fig.12It is exemplarily shown that the driver chip setting area 101 is located in the lower frame area of ​​the display panel 100, and the driver chip 20 is electrically connected to each detection signal line L1 and each repair signal line L2, so that the driver chip 20 can provide a repair signal to each repair signal line L2 one by one according to the detection signal transmitted by each detection signal line L1, so as to ensure that when the first light-emitting element 14 in the pixel circuit 10 works abnormally, the second light-emitting element 15 can be controlled to emit light, thereby meeting the display requirements of the display panel 100 and improving the yield of the display panel 100.

[0080] An embodiment of the present invention further provides a display device, Fig.16 A schematic diagram of a display device according to an embodiment of the present invention is shown in FIG. Fig.16 As shown, the display device 200 provided in the embodiment of the present invention includes the technical features of the display panel 100 provided in the embodiment of the present invention, and can achieve the beneficial effects of the display panel 100 provided in the embodiment of the present invention, which will not be described in detail here. The display device 200 provided in the embodiment of the present invention can be a mobile phone, or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc., and the embodiment of the present invention does not specifically limit this.

[0081] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A pixel circuit, characterized in that: include: A driving circuit, a detection circuit, a repair circuit, a first light emitting element and a second light emitting element; The driving circuit is electrically connected to the anode of the first light emitting element; The driving circuit is used to provide a driving signal to the first light emitting element to control the first light emitting element to emit light; The detection circuit is electrically connected to the cathode of the first light emitting element; The detection circuit is used to output a detection signal according to the cathode potential of the first light-emitting element; The repair circuit is electrically connected to the driving circuit and the second light emitting element respectively; The repair circuit is used to receive a repair signal, and control a driving signal provided to the second light emitting element according to the repair signal, so as to control the second light emitting element to emit light; Wherein, the repair signal is associated with the detection signal; the light emitting time of the second light emitting element is different from that of the first light emitting element; The detection circuit includes a first voltage dividing module, a second voltage dividing module and an amplifying module; The first voltage divider module is electrically connected to the cathode of the first light-emitting element and the first power supply terminal respectively, and the first voltage divider module and the cathode of the first light-emitting element are electrically connected to a first node; the first voltage divider module is used to divide the first power supply signal of the first power supply terminal; The second voltage dividing module is electrically connected to the first node and the amplifying module respectively; the second voltage dividing module is used to divide the potential of the first node and output a voltage dividing signal to the amplifying module; The amplification module is used to output the detection signal after performing gain adjustment on the voltage division signal; The driving circuit includes a driving transistor and a data writing module; The data writing module is electrically connected to the driving transistor; the data writing module is used to control the data signal to be written into the gate of the driving transistor; The second electrode of the driving transistor is electrically connected to the anode of the first light emitting element at a second node; the driving transistor is used to provide a driving signal to the first light emitting element according to the data signal; The repair circuit includes a switch module and a control module; The switch module is electrically connected to the repair signal end and the control module respectively; the switch module is used to control the transmission path of the repair signal from the repair signal end to the control module; The control module is used to provide a driving signal to the second light emitting element according to the repair signal, so as to control the second light emitting element to emit light.

2. The pixel circuit according to claim 1, characterized in that: The first voltage divider module includes a first transistor, a first electrode of the first transistor is electrically connected to the cathode of the first light-emitting element, a second electrode of the first transistor is electrically connected to the first power supply terminal, and a gate of the first transistor is electrically connected to the first scanning signal terminal; During at least a portion of the time when the first light-emitting element or the second light-emitting element emits light, the first scan signal at the first scan signal terminal controls the first transistor to be turned on.

3. The pixel circuit according to claim 2, characterized in that: The second voltage dividing module comprises a second transistor, a first electrode of the second transistor is electrically connected to the first node, a second electrode of the second transistor is electrically connected to the amplifying module, and a gate of the second transistor is electrically connected to a second scanning signal terminal; During at least a portion of the time when the first light-emitting element or the second light-emitting element emits light, the second scan signal at the second scan signal terminal controls the second transistor to be turned on.

4. The pixel circuit according to claim 3, characterized in that: The first scanning signal terminal is multiplexed as the second scanning signal terminal.

5. The pixel circuit according to claim 1, characterized in that: The first voltage divider module includes a first resistor, one end of the first resistor is electrically connected to the cathode of the first light emitting element at the first node, and the other end of the first resistor is electrically connected to the first power supply end.

6. The pixel circuit according to claim 1, characterized in that: The amplification module includes an operational amplifier, a first capacitor and a second resistor; The non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the second voltage divider module, and the inverting input terminal of the operational amplifier is electrically connected to the first power supply terminal; The second resistor is electrically connected between the non-inverting input terminal of the operational amplifier and the output terminal of the operational amplifier; the first capacitor is connected in parallel with the second resistor.

7. The pixel circuit according to claim 1, characterized in that: The switch module includes a third transistor, and the control module includes a fourth transistor; The first electrode of the third transistor T3 is electrically connected to the repair signal terminal, the second electrode of the third transistor is electrically connected to the gate of the fourth transistor T4, and the gate of the third transistor is electrically connected to the third scan signal terminal; A first electrode of the fourth transistor is electrically connected to the second node, and a second electrode of the fourth transistor is electrically connected to the anode of the second light emitting element; When the first light-emitting element emits light, the third scan signal at the third scan signal terminal controls the third transistor to be turned on, and the repair signal at the repair signal terminal controls the fourth transistor to be turned off; When the second light emitting element emits light, the third scan signal at the third scan signal terminal controls the third transistor to be turned on, and the repair signal at the repair signal terminal controls the fourth transistor to be turned on.

8. The pixel circuit according to claim 1, characterized in that: The switch module includes a third transistor T3, and the control module includes a fifth transistor T5 and a sixth transistor T6; The first electrode of the third transistor is electrically connected to the repair signal terminal, the second electrode of the third transistor is electrically connected to the gate of the fifth transistor, and the gate of the third transistor is electrically connected to the third scan signal terminal; The first electrode of the fifth transistor is electrically connected to the data signal terminal, and the second electrode of the fifth transistor is electrically connected to the gate of the sixth transistor; The first electrode of the sixth transistor is electrically connected to the second power supply terminal, and the second electrode of the sixth transistor is electrically connected to the anode of the second light-emitting element; the cathode of the second light-emitting element is electrically connected to the first power supply terminal; the polarity of the first power supply signal of the first power supply terminal and the polarity of the second power supply signal of the second power supply terminal are different; When the first light-emitting element emits light, the third scan signal at the third scan signal end controls the third transistor to be turned on, and the repair signal at the repair signal end controls the fifth transistor to be turned off; When the second light emitting element emits light, the third scan signal at the third scan signal terminal controls the third transistor to be turned on, and the repair signal at the repair signal terminal controls the fifth transistor to be turned on.

9. The pixel circuit according to claim 8, characterized in that: The data writing module comprises a data writing transistor, a first electrode of the data writing transistor is electrically connected to the data signal terminal, and a second electrode of the data writing transistor is electrically connected to the gate of the driving transistor; A channel type of the data write transistor is opposite to a channel type of the fifth transistor.

10. The pixel circuit according to claim 9, characterized in that: The data writing transistor comprises an N-channel transistor, and the fifth transistor comprises a P-channel transistor; The second electrode of the third transistor is also electrically connected to the gate of the data writing transistor.

11. The pixel circuit according to claim 1, characterized in that: The repair circuit also includes a storage module; The storage module is used to store the repair signal.

12. The pixel circuit according to claim 11, characterized in that: One end of the storage module is coupled between the switch module and the control module, and the other end of the storage module is electrically connected to the second node.

13. The pixel circuit according to claim 11, characterized in that: One end of the storage module is coupled between the switch module and the control module, and the other end of the storage module is electrically connected to the third power supply end.

14. A display panel, characterized in that: include: Display area; The display area includes a plurality of pixel circuits as described in any one of claims 1 to 13 arranged in an array.

15. The display panel according to claim 14, characterized in that: Also includes: A non-display area surrounding the display area; the non-display area includes a driver chip setting area; the driver chip setting area is used to set a driver chip; The display area further includes a plurality of detection signal lines and repair signal lines; the detection circuits of the pixel circuits located in the same row or column are electrically connected to the same detection signal line, and the repair circuits of the pixel circuits located in the same row or column are electrically connected to the same repair signal line; The driving chip is electrically connected to each of the detection signal lines and each of the repair signal lines respectively; the driving chip is used to provide a repair signal to each of the repair signal lines in a one-to-one correspondence according to the detection signals transmitted by each of the detection signal lines.

16. A display device, characterized in that: Comprising the display panel as described in any one of claims 14-15.

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