Pixel circuit, display panel and display device

Abstract

Embodiments of the present invention provide a pixel circuit, a display panel, and a display device to address such a problem in an existing pixel circuit that a threshold voltage drift of a driver transistor in a pixel element may occur over the course of its operation with different brightness values ​​of an organic light-emitting diode (OLED) over the course of its operation.In a data transmission stage, a signal charge component in the pixel circuit can transfer an incoming image data signal to the gate of a driver transistor, and the signal is stored in a storage capacitor; and in a threshold voltage compensation stage, a compensation component connects the gate of the driver transistor to the source of the driver transistor to generate a drive signal from the signal stored in the storage capacitor depending on the threshold voltage of the driver transistor, and also to drive an organic light-emitting diode by the drive signal to emit light, thereby eliminating any influence of the threshold voltage of the driver transistor on the current flowing through the organic light-emitting diode and preventing different brightness values ​​of the organic light-emitting diode over its operating life.

Description

Field of the invention

[0001] The present invention relates to the field of display technologies and, more particularly, to a pixel circuit, a display panel and a display device. Background of the invention

[0002] The application of an organic light-emitting diode (AMOLED) for an active matrix display is widely used due to its wide viewing angle, good color contrast, high response speed, low cost, and other advantages. However, the problem of non-uniformity of a thin-film transistor (TFT) array substrate in a process flow can lead to threshold voltage drift.

[0003] In summary, a threshold voltage drift of a driver transistor in a pixel element over the course of its operating life can drive the same OLED to emit light by applying different currents after input of the same image data signal during different periods of time, so that the brightness of the OLED varies over the course of its operating life.

[0004] US 2011 / 0141084 A1 discloses that a pixel circuit comprises an organic EL element, a driver, and a circuit provided between the gate and drain of the driver. When writing to the pixel circuit, an initial voltage is applied to the gate terminal of the driver, and the switch is temporarily controlled to a conductive state while the driver is in a conductive state. A data voltage, corrected using a gate terminal potential of the driver obtained at that time, is applied to the gate terminal of the driver. In at least one embodiment, humans are sensitive to blue color differences but insensitive to green color differences.An initial voltage that increases the accuracy of threshold correction is used for blue pixel circuits, and an initial voltage that reduces power consumption is used for green pixel circuits. This provides a current-driven color display device with high image quality and low power consumption.

[0005] DE 11 2008 002 931 T5 relates to pixel driver circuits for active matrix optoelectronic devices, in particular OLED displays, and describes an active matrix optoelectronic device comprising a plurality of active matrix pixels, each pixel comprising a pixel circuit having a thin film transistor for driving the pixel and a pixel capacitor for storing a pixel value, the TFT comprising a floating gate TFT. Summary of the invention

[0006] Embodiments of the present invention provide a pixel circuit, a display panel, and a display device to address a problem of a prior art pixel circuit that a threshold voltage drift of a driver transistor in a pixel element over its operating life may result in different brightness values of an OLED over its operating life.

[0007] An embodiment of the present invention provides a pixel circuit for driving an organic light-emitting diode, the pixel circuit comprising a signal charge component, a storage capacitor, a compensation component, a mirroring component, and a driver transistor, the signal charge component being configured to transfer an incoming image data signal to the gate of the driver transistor in a data transfer stage; the storage capacitor being configured to store the signal at the gate of the driver transistor; the driver transistor being configured to generate the current at the drain of the driver transistor according to the difference between the signal at the gate of the driver transistor and a signal at the source of the driver transistor in a light-emitting stage;the compensation component is configured to connect the gate of the driver transistor to the source of the driver transistor in a threshold voltage compensation stage to generate a drive signal from the image data signal stored in the storage capacitor in the data transmission stage; and the mirroring component is configured to mirror the current generated by the driver transistor at its drain onto the organic light-emitting diode in the light-emitting stage, so that the organic light-emitting diode emits light with the voltage difference between a first power supply signal and a second power supply signal, wherein the image data signal is input to a first end of the signal charge component, a first control signal is input to a second end of the signal charge component, and a third end of the signal charge component is connected to the gate of the driver transistor;a second control signal is input to a first end of the compensation component, a second end of the compensation component is connected to the gate of the driver transistor, and a third end of the compensation component is connected to the source of the driver transistor; a third control signal is input to a first end of the mirroring component, a second end of the mirroring component is connected to the source of the driver transistor, the second power supply signal is input to the third end of the mirroring component, and a fourth end of the mirroring component is connected to the cathode of the organic light-emitting diode; the first power supply signal is input to the anode of the organic light-emitting diode, and the first power supply signal is input to the drain of the driver transistor; one end of the storage capacitor is connected to the drain of the driver transistor, and another end of the storage capacitor is connected to the gate of the driver transistor;the signal charging component is configured to connect its first end to its third end in the data transmission stage; the compensation component is configured to connect its second end to its third end in the threshold voltage compensation stage to generate the drive signal from the image data signal stored in the storage capacitor; and the mirroring component is configured to connect its second end to its third end in the light emission stage;or wherein the image data signal is input to the fourth end of the signal charge component, a fourth control signal is input to the fifth end of the signal charge component, a sixth end of the signal charge component is connected to one end of the storage capacitor, a fifth control signal is input to the seventh end of the signal charge component, an eighth end of the signal charge component is connected to the drain of the driver transistor, and another end of the storage capacitor is connected to the gate of the driver transistor; a sixth control signal is input to a first end of the compensation component, a second end of the compensation component is connected to the gate of the driver transistor, and a third end of the compensation component is connected to the source of the driver transistor;the fifth control signal is input to a first end of the mirroring component, a second end of the mirroring component is connected to the source of the driver transistor, the second power supply signal is input to the third end of the mirroring component, and a fourth end of the mirroring component is connected to the cathode of the organic light-emitting diode; the first power supply signal is input to the anode of the organic light-emitting diode, and the first power supply signal is input to the drain of the driver transistor; the signal charging component is configured to connect its fourth end to its sixth end in the data transmission stage and to disconnect its fourth end from its sixth end in both the threshold voltage compensation stage and the light emission stage;and to separate its sixth end from its eighth end in both the data transmission stage and the threshold voltage compensation stage, and to connect its sixth end to its eighth end in the light emission stage; the compensation component is configured to connect its second end to its third end in the threshold voltage compensation stage to generate the drive signal from the image data signal stored in the storage capacitor; and the mirroring component is configured to connect its second end to its third end in the light emission stage; wherein the mirroring component is further configured to perform negative feedback control on the current flowing through the organic light-emitting diode to stabilize the current flowing through the organic light-emitting diode;wherein the mirroring component comprises a tenth transistor, an eleventh transistor, a twelfth transistor, and a thirteenth transistor; a first pole of the tenth transistor is the second end of the mirroring component, the gate of the tenth transistor is the first end of the mirroring component, and a second pole of the tenth transistor is connected to a first pole of the eleventh transistor, the gate of the eleventh transistor, the gate of the twelfth transistor, and the gate of the thirteenth transistor, respectively; a second pole of the eleventh transistor is the third end of the mirroring component; and a first pole of the twelfth transistor is connected to a first pole of the thirteenth transistor, a second pole of the twelfth transistor is the third end of the mirroring component, and a second pole of the thirteenth transistor is the fourth end of the mirroring component.

[0008] Another embodiment of the present invention provides a display panel including a pixel circuit according to the embodiment of the present invention.

[0009] Another embodiment of the present invention provides a display device including the display panel according to the embodiment of the present invention.

[0010] Embodiments of the present invention include at least one of the following advantageous effects.

[0011] Embodiments of the present invention provide a pixel circuit, a display panel, and a display device, wherein in a data transmission stage, a signal charge component can transfer an input image data signal to the gate of a driver transistor, and the signal is stored at the gate of the driver transistor;and in a threshold voltage compensation stage, a compensation component can connect the gate of the driver transistor to the source of the driver transistor to generate a drive signal from the image data signal stored in the storage capacitor in the data transmission stage as a function of the threshold voltage of the driver transistor, and also to drive an organic light-emitting diode by the drive signal to emit light, thereby eliminating any influence of the threshold voltage of the driver transistor on the current flowing through the organic light-emitting diode and preventing different brightness values of the organic light-emitting diode over the course of its operating life.; Short description of the drawings Fig. 1 is a schematic structural diagram of a pixel circuit in the prior art; Fig. 2 is a first schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 3 is a second schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 4 is a third schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 5 is a fourth schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 6 is a fifth schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 7 is a sixth schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 8 is a first operational time diagram of the Fig. 4 to Fig. 7 illustrated pixel circuits; Fig. 9 is a second operational time diagram of the Fig. 4 to Fig. 7 illustrated pixel circuits; Fig. 10 is a seventh schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 11 is an eighth schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 12 is a ninth schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 13 is a tenth schematic structural diagram of a pixel circuit according to an embodiment of the present invention; Fig. 14 is a first operational time diagram of the Fig. 10 to Fig. 13 illustrated pixel circuits; Fig. 15 is a second operational time diagram of the Fig. 10 to Fig. 13 illustrated pixel circuits; Fig. 16 is a schematic structural diagram of a display panel according to an embodiment of the present invention; and Fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention. Detailed description of the embodiments

[0012] Embodiments of the present invention provide a pixel circuit, a display panel, and a display device, wherein in a data transmission stage, a signal charge component transmits an input image data signal to the gate of a driver transistor, and the signal is stored in a storage capacitor;and in a threshold voltage compensation stage, a compensation component connects the gate of the driver transistor to the source of the driver transistor to retrieve the threshold voltage of the driver transistor, to generate a drive signal from the image data signal stored in the storage capacitor in the data transmission stage as a function of the threshold voltage of the driver transistor, and also to drive an organic light-emitting diode by the drive signal to emit light, thereby eliminating any influence of the threshold voltage of the driver transistor on the current flowing through the organic light-emitting diode and preventing different brightness values of the organic light-emitting diode over the course of its operating life.;

[0013] Specific embodiments of a pixel circuit, a display panel, and a display device according to embodiments of the present invention will be described below with reference to the drawings.

[0014] As in Fig. 1 illustrates a conventional 2T1C pixel circuit including a switching transistor T1, a driver transistor T2, a storage capacitor C1, and an organic light-emitting diode (OLED), wherein a scan signal, referred to as Scan, is input to the gate of the switching transistor T1, and the scan signal Scan comprises a signal on the gate line connected to the pixel circuit, an image data signal, referred to as Data, is input to the source (or drain) of the switching transistor T1, the drain (or source) of the switching transistor T1 is connected to a first end of the storage capacitor C1, a first drive signal VDD is input to a second end of the storage capacitor C1, the first drive signal VDD is input to the source of the driver transistor T2, the gate of the driver transistor T2 is connected to the first end of the storage capacitor C1,The drain of the driver transistor T2 is connected to the first end of the OLED, and a second drive signal VSS is input to a second end of the driver transistor T2. When a start signal in the scan signal Scan is input to the gate of the switching transistor T1, the switching transistor T1 is turned on, and the image data signal Data input to the source (or drain) of the switching transistor T1 is transferred to the drain (or source) of the switching transistor T1 and stored in the storage capacitor C1. The operation of the driver transistor T2 is controlled by the image data signal Data together with the first drive signal VDD, so that the OLED is driven by the current at the drain of the driver transistor T2 to emit light. In such a 2T1 C-pixel circuit, the current at the drain to drive the OLED to emit light depends on the threshold voltage of the driver transistor T2.and during a long operating time, a threshold voltage drift of the driver transistor T2 may result from the characteristics of the transistor itself, causing the current strength of organic light-emitting diodes in a series of pixel circuits to vary, and exerting a direct influence on the brightness of the light-emitting diodes, which is even more evident in a high-performance light-emitting diode display element.

[0015] An embodiment of the present invention provides a pixel circuit for operating an organic light-emitting diode, the pixel circuit including a signal charging component, a storage capacitor, a compensation component, a mirroring component, and a driver transistor.

[0016] The signal charge component is configured to transfer an incoming image data signal to the gate of the driver transistor in a data transfer stage.

[0017] The storage capacitor is configured to store the signal at the gate of the driver transistor.

[0018] The driver transistor is configured to generate the current at its drain according to the difference between the signal at the gate of the driver transistor and a signal at the source of the driver transistor in a light emitting stage.

[0019] The compensation component is configured to connect the gate of the driver transistor to the source of the driver transistor in a threshold voltage compensation stage to generate a drive signal from the image data signal stored in the storage capacitor in the data transmission stage.

[0020] The mirroring component is configured to mirror the current generated by the driver transistor at the drain of the driver transistor to the organic light-emitting diode in the light-emitting stage, so that the organic light-emitting diode emits light with the voltage difference between a first power supply signal and a second power supply signal.

[0021] The pixel circuit according to the embodiment of the present invention can be implemented in a Fig. 2 illustrated circuit structure or in a Fig. 3, wherein, when a pixel circuit according to the embodiment of the present invention is shown in the circuit structure illustrated in Fig. 2, a transistor in the signal charging component 11, a transistor in the compensation component 12, a transistor in the mirroring component 13, and the driver transistor Td in the pixel circuit are all n-type transistors; and when a pixel circuit according to an embodiment of the present invention is shown in the circuit structure shown in Fig. 3, a transistor in the signal charging component 11, a transistor in the compensation component 12, a transistor in the mirroring component 13, and the driver transistor Td in the pixel circuit are all p-type transistors.

[0022] When the pixel circuit according to the embodiment of the present invention is shown in Fig. 2, the image data signal Data is input to a first end 111 of the signal charge component 11, a first control signal Ctr1 is input to a second end 112 of the signal charge component 11, and a third end 113 of the signal charge component 11 is connected to the gate of the driver transistor Td; a second control signal Ctr2 is input to a first end 121 of the compensation component 12, a second end 122 of the compensation component 12 is connected to the gate of the driver transistor Td, and a third end 123 of the compensation component 12 is connected to the source of the driver transistor Td;a third control signal Ctr3 is input to the first end 131 of the mirroring component 13, a second end 132 of the mirroring component 13 is connected to the source of the driver transistor Td, a second power supply signal VD2 is input to a third end 133 of the mirroring component 132, and a fourth end 134 of the mirroring component 13 is connected to the cathode of the organic light-emitting diode (OLED); the first power supply signal VD1 is input to the anode of the organic light-emitting diode (OLED) and the first power supply signal VD1 is input to the drain of the driver transistor Td; one end of the storage capacitor Cs is connected to the drain of the driver transistor Td and the other end of the storage capacitor Cs is connected to the gate of the driver transistor Td;and the signal charge component 11 is configured to connect the first end 111 of the signal charge component 11 to the third end 113 of the signal charge component 11 in the data transmission stage so that the input image data signal Data is transmitted to the gate of the driver transistor Td in the data transmission stage, the compensation component 12 is configured to connect the second end 122 of the compensation component 12 to the third end 123 of the compensation component 12 in the threshold voltage compensation stage to generate the driver signal from the image data signal stored in the storage capacitor, and the mirroring component 13 is configured to connect the second end 132 of the mirroring component 13 to the third end 133 of the mirroring component 13 in the light emission stage.;

[0023] When the pixel circuit according to the embodiment of the present invention is shown in Fig. 2, the voltage at the gate of the driver transistor Td is the voltage Vdata of the image data signal Data at the end of the data transmission stage, and the voltage at the gate of the driver transistor Td is Vdata + Vth at the end of the threshold voltage compensation stage; and the driver transistor Td in Fig. 2 is an n-type transistor, so the threshold voltage Vth of the driver transistor Td is above zero. The driver transistor Td operates in a saturated region in the light-emitting stage, so the current at its drain is generated from the voltage difference between the gate and drain of the driver transistor Td, so the current value at the drain I d of the driver transistor Td can be calculated using the equation of a current typical for a transistor operating in a saturated region: Id=12k(Vgs−Vth)2. where k depends on a structural parameter of the driver transistor Td, Vth represents the threshold voltage of the driver transistor Td, V gs the difference between the voltage at the gate V g of the driver transistor Td and the voltage at the source V s of the driver transistor Td, ie V gs =V g -V s =Vdata+Vth-Vd1, and Vd1 represents the voltage of the first power supply signal VD1, so the current at the drain is I d of the driver transistor Td Id=12k(Vdata−Vd1)2. It can be seen that the current at the drain I d of the driver transistor Td does not change with the threshold voltage Vth of the driver transistor Td, and the mirror component will control the current at the drain I dof the driving transistor Td to the organic light-emitting diode to drive the organic light-emitting diode to emit light, that is, the threshold voltage Vth of the driving transistor Td will not have any influence on the driving current flowing through the organic light-emitting diode, thereby preventing different brightness values of the organic light-emitting diode over its operating time.

[0024] When the pixel circuit according to the embodiment of the present invention is shown in Fig. 3, the image data signal Data is input to a fourth end 114 of the signal charge component 11, a fourth control signal Ctr4 is input to a fifth end 115 of the signal charge component 11, a sixth end 116 of the signal charge component 11 is connected to one end of the storage capacitor Cs, a fifth control signal Ctr5 is input to a seventh end 117 of the signal charge component 11, an eighth end 118 of the signal charge component 11 is connected to the drain of the driver transistor Td, and the other end of the storage capacitor Cs is connected to the gate of the driver transistor Td; a sixth control signal Ctr6 is input to a first end 121 of the compensation component 12, a second end 122 of the compensation component 12 is connected to the gate of the driver transistor Td, and a third end 123 of the compensation component 12 is connected to the source of the driver transistor Td;the fifth control signal Ctr5 is input to a first end 131 of the mirroring component 13, a second end 132 of the mirroring component 13 is connected to the source of the driver transistor Td, the second power supply signal VD2 is input to a third end 133 of the mirroring component 132, and a fourth end 134 of the mirroring component 13 is connected to the cathode of the organic light-emitting diode (OLED); the first power supply signal VD1 is input to the anode of the organic light-emitting diode (OLED), and the first power supply signal VD1 is input to the drain of the driver transistor Td;and the signal charge component 11 is configured to connect the fourth end 114 of the signal charge component 11 to the sixth end 116 of the signal charge component 11 in the data transmission stage and to separate the fourth end 114 of the signal charge component 11 from the sixth end 116 of the signal charge component 11 in both the threshold voltage compensation stage and the light emission stage; and to separate the sixth end 116 of the signal charge component 11 from the eighth end 118 of the signal charge component 11 in both the data transmission stage and the threshold voltage compensation stage, and to connect the sixth end 116 of the signal charge component 11 to the eighth end 118 of the signal charge component 11 in the light emission stage;The compensation component 12 is configured to connect the second end 122 of the compensation component 12 to the third end 123 of the compensation component 12 in the threshold voltage compensation stage to generate the drive signal from the image data signal stored in the storage capacitor Cs; and the mirroring component 13 is configured to connect the second end 132 of the mirroring component 13 to the third end 133 of the mirroring component 13 in the light emission stage.

[0025] The signal charge component 11 connects the fourth end 114 of the signal charge component 11 to the sixth end 116 of the signal charge component 11, and separates the sixth end 116 of the signal charge component 11 from the eighth end 118 of the signal charge component 11 in the data transmission stage, so that in the data transmission stage, the signal charge component 11 can transmit the input image data signal Data to one end of the storage capacitor Cs, i.e.h the end of the storage capacitor Cs connected to the sixth end 116 of the signal charge component 11, and since the end of the storage capacitor connected to the gate of the driver transistor Td floats, the voltage fluctuation at the end of the storage capacitor Cs connected to the sixth end 116 of the signal charge component 11 can be coupled to the end of the storage capacitor Cs connected to the gate of the driver transistor Td, thus the signal charge component 11 can transmit the input image data signal Data to the gate of the driver transistor Td in the data transmission stage.

[0026] When the pixel circuit according to the embodiment of the present invention is shown in Fig. 3, the voltage at the gate of the driver transistor Td is the voltage Vdata of the image data signal Data at the end of the data transmission stage, and the voltage at the gate of the driver transistor Td is Vdata + Vth at the end of the threshold voltage compensation stage; and the driver transistor Td in Fig. 2 is a p-type transistor, so the threshold voltage Vth of the driver transistor Td is below zero. In the light emission stage, the sixth end 116 of the signal charge component 11 is connected to the eighth end 118 of the signal charge component 11, and the driver transistor Td operates in a saturated region, so the current at the drain of the driver transistor Td is generated from the voltage difference between the gate and the drain of the driver transistor Td, so the current value at the drain I dof the driver transistor Td can be calculated using the equation of a current typical for a transistor operating in a saturated region: Id=12k(Vgs−Vth)2 where k depends on a structural parameter of the driver transistor Td, Vth represents the threshold voltage of the driver transistor Td, V gs the difference between the voltage at the gate V g of the driver transistor Td and the voltage at the source V s of the driver transistor Td, ie V gs =V g -V s =Vdata+Vth-Vd1, and Vd1 represents the voltage of the first power supply signal VD1, so the current at the drain is I d of the driver transistor Td Id=12k(Vdata−Vd1)2. It can be seen that the current at the drain I dof the driver transistor Td does not change with the threshold voltage Vth of the driver transistor Td, and the mirror component will control the current at the drain I d of the driving transistor Td to the organic light-emitting diode to drive the organic light-emitting diode to emit light, that is, the threshold voltage Vth of the driving transistor Td will not have any influence on the driving current flowing through the organic light-emitting diode, thereby preventing different brightness values of the organic light-emitting diode over its operating time.

[0027] In addition, when all the transistors in the signal charge component, the compensation component, and the mirror component in the pixel circuit according to the embodiment of the present invention are n-type transistors, and the driver transistor is an n-type transistor, the pixel circuit according to the embodiment of the present invention corresponds to one of the illustrations in Fig. 4 to Fig. 7, wherein the signal charge component 11 comprises a first transistor T1; a first pole of the first transistor T1 is the first end 111 of the signal charge component 11, the gate of the first transistor T1 is the second end 112 of the signal charge component 11, the first control signal Ctr1 is input to the gate of the first transistor T1, and a second pole of the first transistor T1 is the third end 113 of the signal charge component 11; and the first transistor T1 is turned on in the data transmission stage and turned off in the threshold voltage compensation stage and the light emission stage.

[0028] As in Fig. 4 or Fig. 6 illustrates that when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are n-type transistors, and the driver transistor is an n-type transistor, the compensation component 12 in the pixel circuit according to the embodiment of the present invention includes a fourth transistor T4 and a fifth transistor T5, wherein the gate of the fourth transistor T4 is the first end 121 of the compensation component 12, the second control signal Ctr2 is input to the first end 121, the first pole of the fourth transistor T4 is the second end 122 of the compensation component 12, and the second pole of the fourth transistor T4 is a first pole of the fifth transistor T5;the gate of the fifth transistor T5 is the first end 121 of the compensation component 12, the second control signal Ctr2 is input to the first end 121, and a second pole of the fifth transistor T5 is the third end 123 of the compensation component 12; and both the fourth transistor T4 and the fifth transistor T5 are configured to be turned on in the threshold voltage compensation stage and turned off in the data transmission stage and the light emission stage.

[0029] Since there is a parasitic gate-source capacitance and a parasitic gate-drain capacitance of a transistor itself, as well as a parasitic capacitance of overlapping line segments in the pixel circuit, when the respective control signal changes, a potential at the gate of the driver transistor Td may change due to a coupling effect of the capacitance, thereby weakening the compensation effect in the threshold voltage compensation stage.

[0030] Thus, the compensation component 12 in the pixel circuit according to the embodiment of the present invention preferably comprises Fig. 5 or Fig. 7 illustrates, when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are n-type transistors, and the driver transistor is an n-type transistor, further comprising a sixth transistor T6 and a first capacitor C1, wherein both a first pole of the sixth transistor T6 and one end of the first capacitor C1 are connected to the second pole of the fourth transistor T4; the second power supply signal VD2 is input at the other end of the first capacitor C1; a signal input to the gate of the sixth transistor T6 is the same signal as the signal input to the first end 131 of the mirroring component 13, i.e.the third control signal Ctr3 is input to the gate of the sixth transistor T6, and a second terminal of the sixth transistor T6 is connected to the gate of the driver transistor Td; the sixth transistor T6 is turned on in the light emission stage and turned off in both the data transmission stage and the threshold voltage compensation stage; and the first capacitor C1 is charged in the threshold voltage compensation stage, so that the driver transistor Td generates the drive signal from the stored image data signal.

[0031] After the sixth transistor T6 and the first capacitor C1 are added to the compensation component, in the threshold voltage compensation stage, the second power supply signal VD2 is input to one end of the first capacitor C1, and the voltage of the second power supply signal VD2 is substantially stable, so that the potential at the gate of the driver transistor Td can be effectively blocked. Thus, the potential at the gate of the driver transistor Td does not change readily with the change of the respective control signal, and furthermore, the compensated potential at the gate of the driver transistor Td is thereby closer to a preset potential, i.e., Vdata + Vth.

[0032] As in Fig. 4 or Fig. 5 illustrates that when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are n-type transistors, and the driver transistor is an n-type transistor, the mirroring component in the pixel circuit according to the embodiment of the present invention further includes a seventh transistor T7, an eighth transistor T8, and a ninth transistor T9, wherein a first pole of the seventh transistor T7 is the second end 132 of the mirroring component 13, the gate of the seventh transistor T7 is the first end 131 of the mirroring component 13, the third control signal Ctr3 is input to the first end 131, and a second pole of the seventh transistor T7 is connected to a first pole of the eighth transistor T8, the gate of the eighth transistor T8, and the gate of the ninth transistor T9, respectively;a second pole of the eighth transistor T8 is the third end 133 of the mirroring component 13; and a first pole of the ninth transistor T9 is the fourth end 134 of the mirroring component 13, and a second pole of the ninth transistor T9 is the third end 133 of the mirroring component 13;

[0033] This time, when the parameter of the eighth transistor T8 is the same as that of the ninth transistor T9, the current flowing through the eighth transistor T8 after turning on the seventh transistor T7 is the same as the current flowing through the ninth transistor T9, so the mirroring component can mirror the current at the drain of the driving transistor Td to the organic light-emitting diode to drive the organic light-emitting diode (OLED) to emit light.

[0034] Preferably, when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are n-type transistors, and the driver transistor is an n-type transistor, the mirroring component in the pixel circuit according to the embodiment of the present invention is further configured to perform negative feedback control on the current flowing through the organic light-emitting diode to stabilize the current flowing through the organic light-emitting diode.

[0035] As in Fig. 6 or Fig. 7, the mirroring component in the pixel circuit according to the embodiment of the present invention this time comprises a tenth transistor T10, an eleventh transistor T11, a twelfth transistor T12, and a thirteenth transistor T13, wherein a first pole of the tenth transistor T10 is the second end 132 of the mirroring component 13, the gate of the tenth transistor T10 is the first end 131 of the mirroring component 13, the third control signal Ctr3 is input to the first end 131, and a second pole of the tenth transistor T10 is connected to a first pole of the eleventh transistor T11, the gate of the eleventh transistor T11, the gate of the twelfth transistor T12, and the gate of the thirteenth transistor T13, respectively; a second pole of the eleventh transistor T11 is the third end 133 of the mirroring component 13;and a first pole of the twelfth transistor T12 is connected to a first pole of the thirteenth transistor T13, a second pole of the twelfth transistor T12 is the third end 133 of the mirroring component 13, and a second pole of the thirteenth transistor T13 is the fourth end 134 of the mirroring component 13;

[0036] In Fig. 6 or Fig. 7, when the tenth transistor T10 is turned on, the eleventh transistor T11 operates in a linear region as an active resistor, and when the current at the drain I d of the driver transistor Td is constant, the drain-source current I ds10 of the tenth transistor T10 is constant, and the drain-source current I ds11 of the eleventh transistor T11 corresponds to I ds10 , and the eleventh transistor T11 is an active resistor, so the drain-source voltage difference is V ds11 of the eleventh transistor T11 V ds11 =V g113 +V ds12 constant, where Vg113 represents the voltage difference between the gate of the thirteenth transistor T13 and the first pole of the thirteenth transistor T13, and V ds12 represents the drain-source voltage difference of the twelfth transistor T12; and when the current flowing through the organic light-emitting diode (OLED) increases, the current flowing through the source and drain of the thirteenth transistor T13 increases, and the current flowing through the source and drain of the twelfth transistor T12 increases, and when the current flowing through the source and drain of the twelfth transistor T12 increases, the drain-source voltage difference V ds12 across the twelfth transistor T12, and since the drain-source voltage difference V ds11 of the eleventh transistor T11 is constant, the voltage difference V g113between the gate of the thirteenth transistor T13 and the first pole of the thirteenth transistor T13, and according to the characteristic of a transistor operating in a saturated region - when the voltage difference between the gate of the thirteenth transistor T13 and the first pole of the thirteenth transistor T13 is above the threshold voltage of the thirteenth transistor T13 - the current on the second pole of the thirteenth transistor T13 decreases with the decreasing voltage difference V g113between the gate of the thirteenth transistor T13 and the first terminal of the thirteenth transistor T13, i.e., the current flowing through the organic light-emitting diode (OLED) also decreases. Similarly, when the current flowing through the organic light-emitting diode (OLED) decreases, the current flowing through the source and drain of the thirteenth transistor T13 decreases, and the current flowing through the source and drain of the twelfth transistor T12 decreases. When the current flowing through the source and drain of the twelfth transistor T12 decreases, the drain-source voltage difference V decreases. ds12 across the twelfth transistor T12, and since the drain-source voltage difference V ds11 of the eleventh transistor T11 is constant, the voltage difference V g113between the gate of the thirteenth transistor T13 and the first pole of the thirteenth transistor T13, and according to the characteristic of a transistor operating in a saturated region - when the voltage difference between the gate of the thirteenth transistor T13 and the first pole of the thirteenth transistor T13 is above the threshold voltage of the thirteenth transistor T13 - the current on the second pole of the thirteenth transistor T13 increases with the increasing voltage difference V g113 between the gate of the thirteenth transistor T13 and the first pole of the thirteenth transistor T13, ie the current flowing through the organic light-emitting diode (OLED) also increases. Thus, the reflection component 13 can be Fig. 6 or Fig. 7 stabilize the current flowing through the organic light-emitting diode (OLED).

[0037] The first pole of the eleventh transistor T11, the twelfth transistor T12 or the thirteenth transistor T13 in Fig. 6 or Fig. 7 can be the source (or drain) of the transistor, and the second terminal of the transistor can be the drain (or source) of the transistor. If the source of the transistor is the first terminal, then the drain of the transistor is the second terminal, and if the drain of the transistor is the first terminal, then the source of the transistor is the second terminal.

[0038] The first transistor T1, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9, the tenth transistor T10, the eleventh transistor T11, the twelfth transistor T12, the thirteenth transistor T13 and the driver transistor Td in the Fig. 4, Fig. 5, Fig. 6 and Fig. The pixel circuit illustrated in Figure 7 is all n-type transistors.

[0039] Fig. 8 illustrates an operating time of the Fig. 4, Fig. 5, Fig. 6 and Fig. 7, wherein in the data transmission stage t1, the first control signal Ctr1 has a high level, so the first transistor T1 is turned on, so that the image data signal Data is transferred to the gate of the driver transistor Td and stored in the storage capacitor Cs, and the voltage at the first node N1 is Vdata, i.e. the voltage of the image data signal Data; the second control signal Ctr2 has a low level, so both the fourth transistor T4 and the fifth transistor T5 are turned off; and the third control signal Ctr3 has a low level, so the sixth transistor T6 is turned on Fig. 5 and Fig. 7 is switched off, the seventh transistor T7 in Fig. 4 and Fig. 5 is switched off, and the tenth transistor T10 in Fig. 6 and Fig. 7 is also switched off.

[0040] In the threshold voltage compensation stage t2, the first control signal Ctr1 has a low level, so the first transistor T1 is turned off; the second control signal Ctr2 has a high level, so both the fourth transistor T4 and the fifth transistor T5 are turned on, so that the gate of the driver transistor Td is connected to the source of the driver transistor Td, and the voltage at the first node N1, the voltage at the second node N2 and the voltage at the third node N3 are equal and they all correspond to Vdata + Vth, where Vth represents the threshold voltage of the driver transistor; and the third control signal Ctr3 has a low level, so the sixth transistor T6 is turned on. Fig. 5 and Fig. 7 is switched off, the seventh transistor T7 is Fig. 4 and Fig. 5 is switched off, and the tenth transistor T10 in Fig. 6 and Fig. 7 is also switched off.

[0041] In the light emission stage t3, the first control signal Ctr1 has a low level, so the first transistor T1 is turned off; the second control signal Ctr2 has a low level, so both the fourth transistor T4 and the fifth transistor T5 are turned off; and the third control signal Ctr3 has a high level, so the seventh transistor T7 is turned on. Fig. 4 and Fig. 5 is switched on, the tenth transistor T10 is Fig. 6 and Fig. 7 is switched on, the mirroring component 13 starts working and the sixth transistor T6 in Fig. 5 and Fig. 7 is switched on so that the organic light-emitting diode (OLED) emits light.

[0042] Of course, the operating time of the Fig. 4, Fig. 5, Fig. 6 and Fig. 7 illustrated pixel circuit alternatively the illustration in Fig. 9, wherein the first control signal Ctr1 only changes to a high level when the third control signal Ctr3 changes to a low level, so that with regard to the organic light-emitting diode (OLED), it can be ensured that it only transmits the current frame of the image data signal to the gate of the driver transistor Td when it no longer emits light; in Fig. 9, the first control signal Ctr1 will only change to a high level when the image data signal receives the current frame of the image data, so that with regard to the current frame of the image data signal, it can be ensured that it is only transmitted to the gate of the driver transistor Td when it becomes stable; further, the second control signal Ctr2 will only change to a high level when the first control signal Ctr1 changes to a low level, so that with regard to the threshold voltage compensation, it can be ensured that it is only performed when the first transistor T1 is turned off, and thus the first transistor T1 can be prevented from transmitting the signal to the gate of the driver transistor Td during the threshold voltage compensation;and finally, the third control signal Ctr3 changes to a high level only when the second control signal Ctr2 changes to a low level, so that with respect to the gate of the driving transistor Td, it can be ensured that it is disconnected from the source of the driving transistor Td when the organic light-emitting diode (OLED) is driven to emit light.;

[0043] In addition, when all the transistors in the signal charge component, the compensation component and the mirror component in the pixel circuit according to the embodiment of the present invention are p-type transistors, and the driver transistor is a p-type transistor, the pixel circuit according to the embodiment of the present invention is as in one of Fig. 10 to Fig. 13 illustrates, and the signal charge component 11 includes a second transistor T2 and a third transistor T3, wherein a first pole of the second transistor T2 is the fourth end 114 of the signal charge component 11, the gate of the second transistor T2 is the fifth end 115 of the signal charge component 11, the fourth control signal Ctr4 is input at the fifth end 115, and the second pole of the second transistor T2 is the sixth end 116 of the signal charge component 11; and a first pole of the third transistor T3 is the sixth end 116 of the signal charge component 11, the gate of the third transistor T3 is the seventh end 117 of the signal charge component 11, the fifth control signal Ctr5 is input at the seventh end 117, and a second pole of the third transistor T3 is the eighth end 118 of the signal charge component 11;and the second transistor T2 is turned on in the data transmission stage and turned off in both the threshold voltage compensation stage and the light emission stage, and the third transistor T3 is turned on in the light emission stage and turned off in both the data transmission stage and the threshold voltage compensation stage.;

[0044] In the data transmission stage, the second transistor T2 is turned on and the third transistor T3 is turned off, so in the data transmission stage, the second transistor T2 can transmit the incoming image data signal Data to one end of the storage capacitor Cs, that is, the end of the storage capacitor Cs connected to the second pole of the second transistor T2, and since the end of the storage capacitor Cs connected to the gate of the driver transistor Td floats, according to the coupling behavior of a capacitor, the voltage change at the end of the storage capacitor Cs connected to the second pole of the second transistor T2 can be coupled to the end of the storage capacitor Cs connected to the gate of the driver transistor Td, so that the signal charge component 11 can transmit the incoming image data signal Data to the gate of the driver transistor Td in the data transmission stage.

[0045] As in Fig. 10 or Fig. 12 illustrates that when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are p-type transistors, and the driver transistor is a p-type transistor, the compensation component 12 in the pixel circuit according to the embodiment of the present invention includes a fourth transistor T4 and a fifth transistor T5, wherein a gate of the fourth transistor T4 is the first end 121 of the compensation component 12, and the sixth control signal Ctr6 is input to the first end 121, a first pole of the fourth transistor T4 is the second end 122 of the compensation component 12, and a second pole of the fourth transistor T4 is a first pole of the fifth transistor T5;the gate of the fifth transistor T5 is the first end 121 of the compensation component 12, and the sixth control signal Ctr6 is input to the first end 121, and a second terminal of the fifth transistor T5 is the third end 123 of the compensation component 12; and both the fourth transistor T4 and the fifth transistor T5 are configured to be turned on in the threshold voltage compensation stage and turned off in the data transmission stage and the light emission stage.

[0046] Since there is a parasitic gate-source capacitance and a parasitic gate-drain capacitance of a transistor itself, as well as a parasitic capacitance of overlapping line segments in the pixel circuit, when the respective control signal changes, a potential at the gate of the driver transistor Td may change due to a coupling effect of the capacitance, thereby weakening the compensation effect in the threshold voltage compensation stage.

[0047] Thus, the compensation component 12 in the pixel circuit according to the embodiment of the present invention preferably comprises Fig. 11 or Fig. 13 illustrates, when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are n-type transistors, and the driver transistor is an n-type transistor, further comprising a sixth transistor T6 and a first capacitor C1, wherein both a first terminal of the sixth transistor T6 and one end of the first capacitor C1 are connected to the second terminal of the fourth transistor T4; the second power supply signal VD2 is input to the other end of the first capacitor C1; a signal input to the gate of the sixth transistor T6 is the same signal as the signal input to the first end 131 of the mirroring component 13, i.e.the fifth control signal Ctr5 is input to the gate of the sixth transistor T6, and a second terminal of the sixth transistor T6 is connected to the gate of the driver transistor Td; the sixth transistor T6 is turned on in the light emission stage and turned off in both the data transmission stage and the threshold voltage compensation stage; and the first capacitor C1 is charged in the threshold voltage compensation stage, so that the driver transistor Td generates the drive signal from the stored image data signal.

[0048] After the sixth transistor T6 and the first capacitor C1 are added to the compensation component, in the threshold voltage compensation stage, the second power supply signal VD2 is input to one end of the first capacitor C1, and the voltage of the second power supply signal VD2 is substantially stable, so that the potential at the gate of the driver transistor Td can be effectively blocked. Thus, the potential at the gate of the driver transistor Td does not change readily with the change of the respective control signal, and furthermore, the compensated potential at the gate of the driver transistor Td is thereby closer to a preset potential, i.e., Vdata + Vth; and when the light emission stage starts, i.e.,When the switched-off third transistor is switched on, the first capacitor C1 can effectively block the potential at the gate of the driver transistor Td, so that it does not change when the voltage at the end of the storage capacitor Cs connected to the second pole of the second transistor T2 changes.

[0049] As in Fig. 10 or Fig. 11 illustrates that when all the transistors in the signal charge component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are p-type transistors, and the driver transistor is a p-type transistor, the mirroring component in the pixel circuit according to the embodiment of the present invention includes a seventh transistor T7, an eighth transistor T8, and a ninth transistor T9, wherein a first pole of the seventh transistor T7 is the second end 132 of the mirroring component 13, the gate of the seventh transistor T7 is the first end 131 of the mirroring component 13, and the fifth control signal Ctr5 is input to the first end 131, and a second pole of the seventh transistor T7 is connected to a first pole of the eighth transistor T8, the gate of the eighth transistor T8, and the gate of the ninth transistor T9, respectively;a second pole of the eighth transistor T8 is the third end 133 of the mirroring component 13; and a first pole of the ninth transistor T9 is the fourth end 134 of the mirroring component 13, and a second pole of the ninth transistor T9 is the third end 133 of the mirroring component 13;

[0050] This time, when the parameter of the eighth transistor T8 is the same as that of the ninth transistor T9, the current flowing through the eighth transistor T8 after turning on the seventh transistor T7 is the same as the current flowing through the ninth transistor T9, so the mirroring component can mirror the current at the drain of the driving transistor Td to the organic light-emitting diode to drive the organic light-emitting diode (OLED) to emit light.

[0051] Preferably, when all the transistors in the signal charging component, the compensation component, and the mirroring component in the pixel circuit according to the embodiment of the present invention are p-type transistors, and the driver transistor is a p-type transistor, the mirroring component in the pixel circuit according to the embodiment of the present invention is further configured to perform negative feedback control on the current flowing through the organic light-emitting diode to stabilize the current flowing through the organic light-emitting diode.

[0052] As in Fig. 12 or Fig. 13, the mirroring component in the pixel circuit according to the embodiment of the present invention this time includes a tenth transistor T10, an eleventh transistor T11, a twelfth transistor T12, and a thirteenth transistor T13, wherein a first pole of the tenth transistor T10 is the second end 132 of the mirroring component 13, the gate of the tenth transistor T10 is the first end 131 of the mirroring component 13, and the fifth control signal Ctr5 is input to the first end 131, and a second pole of the tenth transistor T10 is connected to a first pole of the eleventh transistor T11, the gate of the eleventh transistor T11, the gate of the twelfth transistor T12, and the gate of the thirteenth transistor T13, respectively; a second pole of the eleventh transistor T11 is the third end 133 of the mirroring component 13;and a first pole of the twelfth transistor T12 is connected to a first pole of the thirteenth transistor T13, a second pole of the twelfth transistor T12 is the third end 133 of the mirroring component 13, and a second pole of the thirteenth transistor T13 is the fourth end 134 of the mirroring component 13;

[0053] The reflection component 13 in Fig. 12 or Fig. 13 stabilizes the current flowing through the organic light-emitting diode (OLED) according to the same principle as the reflection component 13 in Fig. 6 or Fig. 7 stabilizes the current flowing through organic light-emitting diodes (OLEDs), and it is not necessary to repeat this in this patent specification.

[0054] The first pole of the eleventh transistor T11, the twelfth transistor T12 or the thirteenth transistor T13 in Fig. 12 or Fig. 13 can be the source (or drain) of the transistor, and the second terminal of the transistor can be the drain (or source) of the transistor. If the source of the transistor is the first terminal, then the drain of the transistor is the second terminal, and if the drain of the transistor is the first terminal, then the source of the transistor is the second terminal.

[0055] The second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9, the tenth transistor T10, the eleventh transistor T11, the twelfth transistor T12, the thirteenth transistor T13 and the driver transistor Td in the Fig. 10, Fig. 11, Fig. 12 and Fig. The pixel circuit illustrated in Figure 13 are all p-type transistors.

[0056] Fig. 14 illustrates an operating time of the Fig. 10, Fig. 11, Fig. 12 and Fig. 13, wherein in the data transmission stage t1, since the fourth control signal Ctr4 has a low level, the second transistor T2 is turned on, and since the fifth control signal Ctr5 has a high level, the third transistor T3 is turned off, so that the image data signal Data can be transferred to the gate of the driver transistor Td through the storage capacitor Cs and stored in the storage capacitor Cs, and the voltage at the first node N1 is Vdata, i.e., the voltage of the image data signal Data; the sixth control signal Ctr6 has a high level, so both the fourth transistor T4 and the fifth transistor T5 are turned off; and the fifth control signal Ctr5 has a high level, so the sixth transistor T6 is in Fig. 11 and Fig. 13 is switched off, the seventh transistor T7 in Fig. 10 and Fig. 11 is switched off, and the tenth transistor T10 in Fig. 12 and Fig. 13 is also switched off.

[0057] In the threshold voltage compensation stage t2, the fourth control signal Ctr4 has a high level, so the second transistor T2 is turned off, and the fifth control signal Ctr5 has a high level, so the third transistor T3 is turned off; the sixth control signal Ctr6 has a high level, so both the fourth transistor T4 and the fifth transistor T5 are turned on, so that the gate of the driver transistor Td is connected to the source of the driver transistor Td, and the voltage at the fourth node N4, the voltage at the fifth node N5 and the voltage at the sixth node N6 are equal and all voltage values correspond to Vdata + Vth, where Vth represents the threshold voltage of the driver transistor; and the fifth control signal Ctr5 has a high level, so the sixth transistor T6 is turned on. Fig. 11 and Fig. 13 is switched off, the seventh transistor T7 in Fig. 10 and Fig. 11 is switched off, and the tenth transistor T10 in Fig. 12 and Fig. 13 is also switched off.

[0058] In the light emission stage t3, the fourth control signal Ctr4 has a high level, so the second transistor T2 is turned off, and the fifth control signal Ctr5 has a low level, so the third transistor T3 is turned on and one end of the storage capacitor Cs is no longer floating, but the first power supply signal VD1 is input to this end; the sixth control signal Ctr6 has a high level, so both the fourth transistor T4 and the fifth transistor T5 are turned off; and the fifth control signal Ctr5 has a low level, so the sixth transistor T6 is turned on. Fig. 11 and Fig. 13 is switched on, the seventh transistor T7 is Fig. 10 and Fig. 11 is switched on, and the tenth transistor T10 is switched on Fig. 12 and Fig. 13 is switched on so that the organic light-emitting diode (OLED) emits light.

[0059] Of course, the operating time of the Fig. 10, Fig. 11, Fig. 12 and Fig. 13 illustrated pixel circuit alternatively the illustration in Fig. 15, wherein the fourth control signal Ctr4 only changes to a low level when the fifth control signal Ctr5 changes to a high level, so that with regard to the organic light-emitting diode (OLED), it can be ensured that it only transmits the current frame of the image data signal to the gate of the driver transistor Td when it no longer emits light; in Fig. 15, the fourth control signal Ctr4 will not change to a high level until the image data signal receives the current frame of the image data, so that with regard to the current frame of the image data signal, it can be ensured that it is not transmitted to the gate of the driver transistor Td until it becomes stable; further, the sixth control signal Ctr6 will not change to a low level until the fourth control signal Ctr4 changes to a high level, so that with regard to the threshold voltage compensation, it can be ensured that it is not performed until the second transistor T2 is turned off, and thus the second transistor T2 can be prevented from transmitting the signal to the gate of the driver transistor Td during the threshold voltage compensation;and finally, the fifth control signal Ctr5 changes to a low level only when the sixth control signal Ctr6 changes to a high level, so that with respect to the gate of the driving transistor Td, it can be ensured that it is disconnected from the source of the driving transistor Td when the organic light-emitting diode (OLED) is driven to emit light.;

[0060] An embodiment of the present invention also provides a pixel circuit for operating an organic light-emitting diode, the pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a driver transistor, and a storage capacitor, the first transistor comprising a first terminal to which the image data signal is input, the gate to which a first control signal is input, and a second terminal connected to the gate of the driver transistor and one end of the storage capacitor; the second transistor comprising a first terminal connected to the gate of the driver transistor, the gate to which a second control signal is input, and a second terminal connected to a first terminal of the third transistor;the third transistor includes the gate to which the second control signal is input, and a second terminal connected to the source of the driver transistor; the driver transistor includes the drain to which a first power supply signal is input; the fourth transistor includes a first terminal connected to the source of the driver transistor, the gate to which the third control signal is input, and a second terminal connected to a first terminal of the fifth transistor, the gate of the fifth transistor, and the gate of the sixth transistor, respectively; the fifth transistor includes a second terminal to which a second power supply signal is input; the sixth transistor includes a first terminal connected to the cathode of the organic light-emitting diode and a second terminal to which a second power supply signal is input; and the storage capacitor includes the other end to which the first power supply signal is input.

[0061] This time the first transistor T1 is in Fig. 4, the second transistor is T4 in Fig. 4, the third transistor is T5 in Fig. 4, the driver transistor is Td in Fig. 4, the fourth transistor is T7 in Fig. 4, the fifth transistor is T8 in Fig. 4, the sixth transistor is T9 in Fig. 4, the storage capacitor is Cs in Fig. 4 and the organic light-emitting diode is the OLED in Fig. 4.

[0062] Optionally, the pixel circuit according to the embodiment of the present invention further comprises a seventh transistor and a first capacitor, wherein the seventh transistor comprises a first terminal connected to the second terminal of the second transistor, a gate to which the third control signal is input, and a second terminal connected to the gate of the driver transistor; and the first capacitor comprises one end connected to the second terminal of the second transistor and the other end to which the second power supply signal is input.

[0063] This time the seventh transistor T6 is in Fig. 5 and the first capacitor is C1 in Fig. 5.

[0064] Optionally, the pixel circuit according to the embodiment of the present invention further comprises an eighth transistor, wherein the first pole of the sixth transistor is connected to the cathode of the organic light-emitting diode through the eighth transistor, and the gate of the eighth transistor is connected to the second pole of the fourth transistor.

[0065] This time the fourth transistor T10 is in Fig. 6 or Fig. 7, the fifth transistor is T11 in Fig. 6 or Fig. 7, the sixth transistor is T12 in Fig. 6 or Fig. 7 and the eighth transistor is T13 in Fig. 6 or Fig. 7.

[0066] An embodiment of the present invention further provides a pixel circuit for operating an organic light-emitting diode, the pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, a driver transistor, and a storage capacitor.

[0067] The first transistor comprises a first terminal to which an image data signal is input, the gate to which the fourth control signal is input, and a second terminal each connected to a first terminal of the second transistor and to one end of the storage capacitor.

[0068] The second transistor comprises the gate, to which a fifth control signal is input, and a second pole connected to the drain of the driver transistor.

[0069] The storage capacitor includes the other end connected to the gate of the driver transistor.

[0070] The third transistor comprises a first pole connected to the gate of the driver transistor, the gate to which a sixth control signal is input, and a second pole connected to a first pole of the fourth transistor.

[0071] The fourth transistor comprises the gate to which the sixth control signal is input and a second terminal connected to the source of the driver transistor.

[0072] The driver transistor includes the drain, to which a first power supply signal is input.

[0073] The fifth transistor comprises a first terminal connected to the source of the driver transistor, the gate to which the fifth control signal is input, and a second terminal connected to a first terminal of the sixth transistor, the gate of the sixth transistor, and the gate of the seventh transistor, respectively.

[0074] The sixth transistor includes a second terminal to which the second power supply signal is input.

[0075] The seventh transistor comprises a terminal connected to the cathode of the organic light-emitting diode and a second terminal to which the second power supply signal is input.

[0076] This time the first transistor T2 is in Fig. 10, the second transistor is T3 in Fig. 10, the storage capacitor is Cs in Fig. 10, the third transistor is T4 in Fig. 10, the fourth transistor is T5 in Fig. 10, the driver transistor is Td in Fig. 10, the fifth transistor is T7 in Fig. 10, the sixth transistor is T8 in Fig. 10, the seventh transistor is T9 in Fig. 10, and the organic light-emitting diode is the OLED in Fig. 10.

[0077] Optionally, the pixel circuit according to the embodiment of the present invention further comprises an eighth transistor and a first capacitor, wherein the eighth transistor comprises a first terminal connected to a second terminal of the third transistor, the gate to which a fifth control signal is input, and a second terminal connected to the gate of the driver transistor; and the first capacitor comprises one end connected to a second terminal of the third transistor and the other end to which the second power supply signal is input.

[0078] This time the eighth transistor T6 is in Fig. 11, and the first capacitor is C1 in Fig. 11.

[0079] Optionally, the pixel circuit according to the embodiment of the present invention further comprises a ninth transistor, wherein a first pole of the seventh transistor is connected to the cathode of the organic light-emitting diode through the ninth transistor, and the gate of the ninth transistor is connected to a second pole of the fifth transistor.

[0080] This time the fifth transistor T10 is in Fig. 12 or Fig. 13, the sixth transistor is T11 in Fig. 12 or Fig. 13, the seventh transistor is T12 in Fig. 12 or Fig. 13 and the ninth transistor is T13 in Fig. 12 or Fig. 13.

[0081] The first terminal of the transistor, as described in the embodiment of the present invention, may be the source (or drain) of the transistor, and the second terminal of the transistor may be the drain (or source) of the transistor. If the source of the transistor is the first terminal, then the drain of the transistor is the second terminal; and if the drain of the transistor is the first terminal, then the source of the transistor is the second terminal. The connection s referred to in the embodiment of the present invention includes a physical connection and an electrical connection.

[0082] An embodiment of the present invention provides a display panel as shown in Fig. 16, including a pixel circuit 61 according to each of the above embodiments of the present invention and an array substrate 162.

[0083] When the display panel comprises a plurality of pixel circuits, the first control signal, the second control signal and the third control signal received by each pixel circuit may come from different signal sources or they may originate from a signal output from the same signal source.

[0084] Similarly, when the display panel comprises a plurality of pixel circuits, the fourth control signal, the fifth control signal, and the sixth control signal received from each pixel circuit may come from different signal sources, or they may originate from a signal output from the same signal source.

[0085] An embodiment of the present invention provides a display device as shown in Fig. 17 illustrates a front view, including the display panel 171 according to the embodiment of the present invention and a housing 172 of the display device.

[0086] Those skilled in the art will understand that the drawings are merely schematic representations of the preferred embodiments of the present invention and that not all components or processes in the drawings are absolutely necessary to practice the present invention.

[0087] Those skilled in the art will understand that the components in the devices according to the embodiments may be distributed among the devices of the embodiments as described in the embodiments, or may be located in one or more devices other than the respective embodiments, while being adapted accordingly. The components in the above embodiments may be integrated into a single component or divided into a plurality of subcomponents.

[0088] The above embodiments of the present invention have been numbered for convenience of description only, but do not indicate any priority of one embodiment over another.

[0089] Obviously, those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to embrace such modifications and changes as long as the modifications and changes fall within the scope of the appended claims of the present invention and their equivalents.

Claims

[1] A pixel circuit for operating an organic light-emitting diode, the pixel circuit comprising a signal charge component (11), a storage capacitor (C1, Cs), a compensation component (12), a mirroring component (13) and a driver transistor (T2, Td), wherein: the signal charge component (11) is configured to transmit an input image data signal to the gate of the driver transistor (T2, Td) in a data transmission stage; the storage capacitor (C1, Cs) is configured to store a signal at the gate of the driver transistor (T2, Td); the driver transistor (T2, Td) is configured to generate the current at its drain according to the difference between the signal at its gate and the signal at its source in a light emission stage; the compensation component (12) is configured to connect the gate of the driver transistor (T2, Td) and the source of the driver transistor (T2, Td) in a threshold voltage compensation stage to generate a drive signal from the image data signal stored in the storage capacitor (C1, Cs) in the data transmission stage; and the mirroring component (13) is configured to mirror the current generated by the driver transistor (T2, Td) at its drain onto the organic light-emitting diode in the light-emitting stage, so that the organic light-emitting diode emits light with the voltage difference between a first power supply signal and a second power supply signal; wherein the image data signal is input to a first end of the signal charge component (11), a first control signal (Ctr1) is input to a second end (112) of the signal charge component (11), and a third end (113) of the signal charge component (11) is connected to the gate of the driver transistor (T2, Td); a second control signal (Ctr2) is input to a first end (121) of the compensation component (12), a second end (122) of the compensation component (12) is connected to the gate of the driver transistor (T2, Td), and a third end (123) of the compensation component (12) is connected to the source of the driver transistor (T2, Td);a third control signal (Ctr3) is input to a first end (131) of the mirroring component (13), a second end (132) of the mirroring component (13) is connected to the source of the driver transistor (T2, Td), the second power supply signal is input to the third end (133) of the mirroring component (13), and a fourth end (134) of the mirroring component (13) is connected to the cathode of the organic light-emitting diode; the first power supply signal is input to the anode of the organic light-emitting diode, and the first power supply signal is input to the drain of the driver transistor (T2, Td); one end of the storage capacitor (C1, Cs) is connected to the drain of the driver transistor (T2, Td), and another end of the storage capacitor (C1, Cs) is connected to the gate of the driver transistor (T2, Td); the signal charging component (11) is configured to connect its first end (111) to its third end (113) in the data transmission stage; the compensation component (12) is configured to connect its second end (122) to its third end (123) in the threshold voltage compensation stage to generate the drive signal from the image data signal stored in the storage capacitor (C1, Cs); and the mirroring component (13) is configured to connect its second end (132) to its third end (133) in the light emission stage; or wherein the image data signal is input to the fourth end (114) of the signal charge component (11), a fourth control signal (Ctr4) is input to the fifth end (115) of the signal charge component (11), a sixth end (116) of the signal charge component (11) is connected to one end of the storage capacitor (C1, Cs), a fifth control signal (Ctr5) is input to the seventh end (117) of the signal charge component (11), an eighth end (118) of the signal charge component (11) is connected to the drain of the driver transistor (T2, Td), and another end of the storage capacitor (C1, Cs) is connected to the gate of the driver transistor (T2, Td); a sixth control signal (Ctr5) is input to a first end (121) of the compensation component (12), a second end (122) of the compensation component (12) is connected to the gate of the driver transistor (T2, Td), and a third end (123) of the compensation component (12) is connected to the source of the driver transistor (T2, Td);the fifth control signal (Ctr5) is input to a first end (131) of the mirroring component (13), a second end (132) of the mirroring component (13) is connected to the source of the driver transistor (T2, Td), the second power supply signal is input to the third end (133) of the mirroring component (13), and a fourth end (134) of the mirroring component (13) is connected to the cathode of the organic light-emitting diode; the first power supply signal is input to the anode of the organic light-emitting diode, and the first power supply signal is input to the drain of the driver transistor (T2, Td); the signal charge component (11) is configured to connect its fourth end (114) to its sixth end (116) in the data transmission stage, and to separate its fourth end (114) from its sixth end (116) in both the threshold voltage compensation stage and the light emission stage; and to separate its sixth end (116) from its eighth end (118) in both the data transmission stage and the threshold voltage compensation stage, and to connect its sixth end (116) to its eighth end (118) in the light emission stage; the compensation component (12) is configured to connect its second end (122) to its third end (123) in the threshold voltage compensation stage to generate the drive signal from the image data signal stored in the storage capacitor (C1, Cs); and the mirroring component (13) is configured to connect its second end (132) to its third end (133) in the light emission stage; wherein the mirroring component (13) is further configured to perform negative feedback control on the current flowing through the organic light-emitting diode to stabilize the current flowing through the organic light-emitting diode; wherein the mirroring component (13) comprises a tenth transistor (T10), an eleventh transistor (T11), a twelfth transistor (T12) and a thirteenth transistor (T12); a first pole of the tenth transistor (T10) is the second end (132) of the mirroring component (13), the gate of the tenth transistor (T10) is the first end (131) of the mirroring component (13), and a second pole of the tenth transistor (T10) is connected to a first pole of the eleventh transistor (T11), the gate of the eleventh transistor (T11), the gate of the twelfth transistor (T12), and the gate of the thirteenth transistor (T12); a second pole of the eleventh transistor (T11) is the third end (133) of the mirroring component (13); and a first pole of the twelfth transistor (T12) is connected to a first pole of the thirteenth transistor (T12), a second pole of the twelfth transistor (T12) is the third end (133) of the mirroring component (13), and a second pole of the thirteenth transistor (T12) is the fourth end (134) of the mirroring component (13). [2] The pixel circuit according to claim 1, wherein the signal charge component (11) comprises a first transistor (T1); a first pole of the first transistor (T1) is the first end (111) of the signal charge component (11), the gate of the first transistor (T1) is the second end (112) of the signal charge component (11); and a second pole of the first transistor (T1) is the third end (113) of the signal charge component (11); and the first transistor (T1) is switched on in the data transmission stage and switched off in the threshold voltage compensation stage and the light emission stage. [3] The pixel circuit according to claim 1, wherein the signal charge component (11) comprises a second transistor (T2) and a third transistor (T3); a first pole of the second transistor (T2) is the fourth end (114) of the signal charge component (11), the gate of the second transistor (T2) is the fifth end (115) of the signal charge component (11), and the second pole of the second transistor (T2) is the sixth end (116) of the signal charge component (11); and a first pole of the third transistor (T3) is the sixth end (116) of the signal charge component (11), the gate of the third transistor (T3) is the seventh end (117) of the signal charge component (11), and a second pole of the third transistor (T3) is the eighth end (118) of the signal charge component (11); the second transistor (T2) is switched on in the data transmission stage and switched off in the threshold voltage compensation stage and the light emission stage; and the third transistor (T3) is switched on in the light emission stage and switched off in the data transmission stage and the threshold voltage compensation stage. [4] The pixel circuit of claim 1, wherein the compensation component (12) comprises a fourth transistor (T4) and a fifth transistor (T5); a gate of the fourth transistor (T4) is the first end (121) of the compensation component (12), a first pole of the fourth transistor (T4) is the second end (122) of the compensation component (12), and a second pole of the fourth transistor (T4) is connected to a first pole of the fifth transistor (T5); and the gate of the fifth transistor (T5) is the first end (121) of the compensation component (12), and a second pole of the fifth transistor (T5) is the third end (123) of the compensation component (12); and both the fourth transistor (T4) and the fifth transistor (T5) are configured to be turned on in the threshold voltage compensation stage and turned off in the data transmission stage and the light emission stage. [5] The pixel circuit according to claim 4, wherein the compensation component (12) further comprises a sixth transistor (T6) and a first capacitor; both a first terminal of the sixth transistor (T6) and one end of the first capacitor are connected to the second terminal of the fourth transistor (T4); the second power supply signal is input to another end of the first capacitor; a signal input to the gate of the sixth transistor (T6) is the same signal as the signal input to the first end (131) of the mirroring component (13), and a second terminal of the sixth transistor (T6) is connected to the gate of the driver transistor (T2, Td); the sixth transistor (T6) is turned on in the light emission stage and turned off in both the data transmission stage and the threshold voltage compensation stage;and the first capacitor in the threshold voltage compensation stage is charged so that the driver transistor (T2, Td) generates the driver signal from the stored image data signal; [6] A display panel including a plurality of pixel elements, each of which comprises an organic light-emitting diode and the pixel circuit according to any one of claims 1 to 5. [7] A display device comprising a display panel according to claim 6.

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