Pixel circuit driving method, display device and driving method thereof

Abstract

The embodiment of the invention discloses a driving method of a pixel circuit, a display device and a driving method thereof, in a current output stage, a driving module generates a detection current according to a detection data voltage and an initial voltage, a detection module responds to a second scanning signal to transmit the detection current to a sensing signal line, and in a second detection write-in stage, the driving module outputs the detection current. The data write-in module responds to the first scanning signal and writes a set data voltage into the control end of the driving module. The set data voltage meets the condition that the driving module is turned off, the threshold voltage of the driving module can be detected in the screen turn-off state, and normal display of a display picture is not affected in the threshold voltage detection process of the driving module. In addition, the set data voltage meets the requirement that the driving module is turned off, and the compensation accuracy of the threshold voltage of the driving module can be improved. Or, the set data voltage is the display data voltage corresponding to the pixel circuit in the display stage, and the influence of the threshold voltage detection process of the driving module on the normal display picture of the display panel is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to a driving method of a pixel circuit, a display device and a driving method thereof. Background Art

[0002] With the development of display technology, users have higher and higher requirements for the uniformity of picture display.

[0003] In a display panel, the threshold voltages of driving transistors in different pixel circuits are not uniform, which will result in poor uniformity of the display screen of the display panel. Therefore, it is necessary to detect and compensate the threshold voltages of the driving transistors.

[0004] However, in the conventional display panel, the detection of the threshold voltage of the driving transistor of the pixel circuit will affect the normal display process of the display image. Summary of the invention

[0005] The present invention provides a driving method of a pixel circuit, a display device and a driving method thereof, so as to reduce the influence of a threshold voltage detection process of a driving transistor on a normal display process of a display panel and improve user experience.

[0006] In a first aspect, an embodiment of the present invention provides a driving method for a pixel circuit, wherein the pixel circuit includes a data writing module, a driving module, and a detection module; the driving method includes a display phase and a detection phase, wherein the detection phase includes a first detection writing phase, a current output phase, and a second detection writing phase; the driving method includes:

[0007] In the first detection writing stage, the data writing module writes the detection data voltage to the control terminal of the driving module in response to the first scanning signal, and the detection module writes the initial voltage to the first terminal of the driving module in response to the second scanning signal;

[0008] In the current output stage, the driving module generates a detection current according to the detection data voltage and the initial voltage, and the detection module transmits the detection current to the sensing signal line in response to the second scanning signal;

[0009] In the second detection writing phase, the data writing module writes a set data voltage to the control terminal of the driving module in response to the first scanning signal;

[0010] The data voltage is set to be sufficient to turn off the driving module, or the data voltage is set to be a display data voltage corresponding to the pixel circuit in the display stage.

[0011] Optionally, the data voltage is set to turn off the driving module; and the timing of the first scanning signal and the second scanning signal are the same.

[0012] Optionally, the driving method further includes:

[0013] In the second detection writing phase, the detection module is turned off in response to the second scanning signal.

[0014] Optionally, the data voltage is set to a display data voltage corresponding to the pixel circuit in a target display phase, and the target display phase is a display phase before or after the detection phase and continuous with the detection phase.

[0015] Optionally, the driving method of the pixel circuit further includes:

[0016] In the display stage, the data writing module writes the display data voltage to the control terminal of the driving module in response to the first scanning signal;

[0017] The pixel circuit also includes a storage module, a first end of the storage module is electrically connected to the control end of the driving module, a second end of the storage module is electrically connected to the first end of the driving module, and the storage module is used to store and maintain the voltage difference between the control end and the first end of the driving module.

[0018] In a second aspect, an embodiment of the present invention further provides a display device, comprising a plurality of pixel circuits, wherein the pixel circuits are driven by the driving method of the pixel circuit of the first aspect.

[0019] Optionally, the display device further includes a plurality of first scan lines, a plurality of second scan lines, a plurality of data lines and a plurality of sensing signal lines;

[0020] The control end of the data writing module is electrically connected to the first scanning line, the first end of the data writing module is electrically connected to the data line, and the second end of the data writing module is electrically connected to the control end of the driving module;

[0021] The control end of the detection module is electrically connected to the second scanning line, the first end of the detection module is electrically connected to the sensing signal line, and the second end of the detection module is electrically connected to the first end of the driving module;

[0022] Optionally, the data voltage is set to be sufficient to turn off the driving module; the first scan line is multiplexed as the second scan line;

[0023] Optionally, each first scan line is connected to a data writing module of at least one row of pixel circuits, and each second scan line is connected to a detection module of at least one row of pixel circuits; each data line is connected to a data writing module of at least one column of pixel circuits, and each sensing signal line is connected to a detection module of one column of pixel circuits;

[0024] Optionally, the display device further includes an initial voltage input terminal and at least one first control switch, wherein the initial voltage input terminal is connected to at least one sensing signal line through the first control switch; the first control switch is used to be turned on in the first detection writing phase of each pixel circuit and turned off in the current output phase of each pixel circuit under the control of a first control signal;

[0025] Optionally, the first control switch is further used to be turned off in the second detection and writing phase of each pixel circuit under the control of the first control signal;

[0026] Optionally, the display device includes a plurality of first control switches, and the first control switches are electrically connected to the sensing signal lines in a one-to-one correspondence;

[0027] Optionally, the display device further includes an integration module, an input end of the integration module is electrically connected to at least one sensing signal line, an output end of the integration module is connected to a detection chip, and the detection chip is used to determine a threshold voltage of the driving module in the pixel circuit according to a signal output by the integration module;

[0028] The integration module includes an operational amplifier, an integration capacitor, an initialization switch and a sampling switch. The non-inverting input terminal of the operational amplifier is connected to a reference voltage, and the inverting input terminal of the operational amplifier is electrically connected to the input terminal of the integration module; the integration capacitor and the initialization switch are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the output terminal of the integration module through the sampling switch; the initialization switch is used to be turned on before the current output stage of the pixel circuit connected to the integration module and / or during the set period of the current output stage, and the set period includes at least a part of the period within the set time of entering the current output stage, and the set time is less than the total time of the current output stage; the sampling switch is used to be turned on during the current output stage of the pixel circuit connected to the integration module; the output terminal of the operational amplifier, the integration capacitor, the initialization switch and the sampling switch are connected to the same node;

[0029] Optionally, each integration module is connected to at least two sensing signal lines through a switch module, the switch module includes at least two second control switches, the second control switches are electrically connected to the sensing signal lines one-to-one through their first ends, and the second ends of the second control switches are electrically connected to the input ends of the integration module; the switch module is used to select different second control switches according to the second control signals connected to the second control switches during the current output stage of the different columns of pixel circuits connected, wherein the second control signals connected to different second control switches are different.

[0030] In a third aspect, an embodiment of the present invention further provides a method for driving a display device, comprising:

[0031] Controlling multiple rows of pixel circuits to enter the detection phase in sequence;

[0032] In the first detection writing stage of the pixel circuit, a detection data voltage is provided to the data line connected to the pixel circuit, and a first scanning signal of a conduction level is provided to the first scanning line connected to the pixel circuit, and a data writing module is controlled to write the detection data voltage to the control end of the driving module; and an initial voltage is provided to the sensing signal line connected to the pixel circuit, and a second scanning signal of a conduction level is provided to the second scanning line connected to the pixel circuit, and a detection module is controlled to write the initial voltage to the first end of the driving module;

[0033] In the current output phase of the pixel circuit, the initial voltage provided to the sensing signal line connected to the pixel circuit is turned off, and a second scanning signal of a conduction level is provided to the second scanning line connected to the pixel circuit, and the detection module is controlled to transmit the detection current output by the driving module to the correspondingly connected sensing signal line;

[0034] In the second detection writing phase of the pixel circuit, a set data voltage is provided to the data line connected to the pixel circuit, and a first scanning signal of a conduction level is provided to the first scanning line connected to the pixel circuit, and the data writing module is controlled to write the set data voltage to the driving module;

[0035] The data voltage is set to be sufficient to turn off the driving module, or the data voltage is set to be a data voltage corresponding to the pixel circuit in the display phase.

[0036] Optionally, the display device includes at least one display area, the display area includes at least one row of pixel circuits, and controlling the plurality of rows of pixel circuits to sequentially enter the detection phase includes:

[0037] Controlling and setting each row of pixel circuits in the display area to enter the detection phase in sequence; setting the display area to be one of at least one display area;

[0038] Optionally, the detection phase is located between two adjacent display phases;

[0039] The driving method of the display device further includes:

[0040] In each display stage, a first scanning signal of a conduction level is sequentially provided to each first scanning line, and a display data voltage is provided to each data line, so that each row of pixel circuits is sequentially written with the display data voltage, and a driving module generates a driving current according to the display data voltage;

[0041] Optionally, the detection phase is located in the inter-frame blanking area;

[0042] Optionally, the display device includes at least two display areas;

[0043] Optionally, controlling and setting each row of pixel circuits in the display area to enter the detection phase in sequence includes:

[0044] Between different display phases, each row of pixel circuits in different display areas is controlled to enter the detection phase in sequence.

[0045] Optionally, in the first detection writing phase of the pixel circuit, providing an initial voltage to a sensing signal line connected to the pixel circuit includes:

[0046] In the first detection writing phase of the pixel circuit, a first control signal of a conduction level is provided to the first control switch to turn on the first control switch, and an initial voltage is transmitted to the sensing signal line to initialize the first end of the driving module and the integration module;

[0047] In the current output phase of the pixel circuit, shutting off the initial voltage provided to the sensing signal line connected to the pixel circuit comprises:

[0048] In the current output phase of the pixel circuit, a first control signal of an off level is provided to the first control switch, so that the first control switch is turned off, thereby turning off the initial voltage provided to the sensing signal line connected to the pixel circuit;

[0049] The driving method also includes:

[0050] In the current output phase of the pixel circuit, one of the second control switches of the switch module is turned on to transmit the detection current to the input end of the integration module through the sensing signal line, and at least in the end period of the current output phase of the pixel circuit, the sampling switch in the integration module is controlled to be turned on to transmit the output signal of the integration module to the detection chip;

[0051] Optionally, the tail period includes the second half of the current output phase.

[0052] The driving method of the pixel circuit, the display device and the driving method thereof of the embodiment of the present invention are as follows: in the current output stage, the driving module generates a detection current according to the detection data voltage and the initial voltage, the detection module transmits the detection current to the sensing signal line in response to the second scanning signal, and in the second detection writing stage, the data writing module writes the set data voltage to the control end of the driving module in response to the first scanning signal. The setting data voltage satisfies the driving module to turn off, and the threshold voltage detection of the driving module can be realized in the off-screen state. Therefore, the threshold voltage detection process of the driving module will not affect the normal display of the display screen, thereby improving the user experience. In addition, the setting data voltage satisfies the driving module to turn off, thereby preventing the pixel circuit from continuing to conduct and transmitting current to the sensing signal line after outputting the detection current to the sensing signal line in the current output stage, thereby improving the compensation accuracy of the threshold voltage of the driving module and improving the display effect. Alternatively, setting the data voltage to the display data voltage corresponding to the pixel circuit in the display stage can enable the pixel circuit to restore the normal display image in the display stage after outputting the detection current to the sensing signal line in the current output stage, thereby ensuring that the display can still be performed normally after the threshold voltage of the driving module is detected, reducing the impact of the threshold voltage detection process of the driving module on the normal display image of the display panel, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of the structure of a pixel circuit in the related art;

[0054] Figure 2 is a flow chart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0055] Figure 3 It is a structural schematic diagram of another pixel circuit in the related art;

[0056] Figure 4 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0057] Figure 5 is a structural schematic diagram of a display device provided by an embodiment of the present invention;

[0058] Figure 6 is a schematic structural diagram of another display device provided by an embodiment of the present invention;

[0059] Figure 7 It is a structural schematic diagram of the connection between the pixel circuit and the integration module;

[0060] Figure 8 is a flow chart of a method for driving a display device provided by an embodiment of the present invention;

[0061] Fig. 9is a driving timing diagram of a display device provided by an embodiment of the present invention;

[0062] Fig.10 This is a driving timing diagram of another display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0063] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0064] As described in the background technology, the prior art has the problem that the threshold voltage detection of the driving transistor of the pixel circuit will affect the normal display process of the display screen. The inventor has found that in the prior art, the pixel circuit includes an internal compensation pixel circuit applied in an internal compensation mode, and an external compensation pixel circuit applied in an external compensation mode. Compared with the internal compensation pixel circuit, the number of transistors included in the external compensation pixel circuit is small, which is conducive to improving the pixel density. However, the external compensation pixel circuit needs to be combined with an external detection circuit to detect the threshold voltage of the driving transistor, and the detection signal line is usually connected to multiple pixel circuits. When the threshold voltage of the driving transistor of one of the pixel circuits connected to the same detection signal line is detected, the gate of the driving transistor in the other pixel circuits still maintains the detection data voltage, so that the driving transistor is turned on, causing the display screen to jump from the normal display screen to the detection screen during detection, affecting the normal display process and the user experience.

[0065] Figure 1 A schematic diagram of a pixel circuit in the related art, see Figure 1 , the pixel circuit includes a data writing module 10, a driving module 20, and a detection module 30; Figure 2 is a flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 2 , wherein the driving method includes a display stage and a detection stage, the detection stage includes a first detection writing stage, a current output stage and a second detection writing stage; the driving method includes:

[0066] Step 110, in the first detection writing stage, the data writing module writes the detection data voltage to the control terminal of the driving module in response to the first scanning signal, and the detection module writes the initial voltage to the first terminal of the driving module in response to the second scanning signal.

[0067] Specifically, in the first detection writing stage, the first scanning signal Scan1 is at a conduction level, and the conduction level of the first scanning signal Scan1 is a level that can turn on the data writing module 10, so that the data writing module 10 is turned on, and the detection data voltage is written to the control terminal G of the driving module 20. In the first detection writing stage, the second scanning signal Scan2 is also at a conduction level, and the conduction level of the second scanning signal Scan2 is a level that can turn on the detection module 30, so that the detection module 30 is turned on, and the initial voltage is written to the first terminal of the driving module 20. The detection data voltage and the initial voltage meet the conduction condition of the driving module 20, that is, the driving module 20 is turned on when the control terminal G is the detection data voltage and the first terminal is the initial voltage, and the detection current is generated.

[0068] Step 120 , in the current output stage, the driving module generates a detection current according to the detection data voltage and the initial voltage, and the detection module transmits the detection current to the sensing signal line in response to the second scanning signal.

[0069] Specifically, in the current output stage, the driving module 20 is turned on according to the detection data voltage and the initial voltage, and generates a detection current. In the current output stage, the second scan signal Scan2 is at the on level, so that the detection module 30 is turned on and the detection current is transmitted to the sensing signal line Sense. The sensing signal line Sense can be connected to an external threshold voltage detection circuit, and the external threshold voltage detection circuit determines the threshold voltage of the driving module 20 according to the sensing current on the sensing signal line Sense in the current output stage. In some optional embodiments, a lookup table of the corresponding relationship between the sensing current and the threshold voltage can be obtained in advance, and the corresponding threshold voltage can be determined in the lookup table according to the sensing current. Among them, the driving module 20 can include a driving transistor DT, and the threshold voltage of the driving module 20 is also the threshold voltage of the driving transistor DT. Among them, in the current output stage, the first scan signal Scan1 can also maintain the on level, and accordingly, the data writing module 10 is turned on; the first scan signal Scan1 can also jump to the off level, wherein the off level of the first scan signal Scan1 is the level that turns off the data writing module 10, so that the data writing module 10 is turned off. Optionally, the pixel circuit also includes a storage module 40, a first end of the storage module 40 can be electrically connected to the control end G of the driving module 20, a second end of the storage module 40 can be electrically connected to the first end of the driving module 20, and the storage module 40 can be used to store and maintain the voltage difference between the control end G and the first end of the driving module 20.

[0070] Step 130 : In the second detection writing phase, the data writing module writes a set data voltage to the control terminal of the driving module in response to the first scanning signal.

[0071] The detection data voltage and the setting data voltage can both be transmitted by the data line Data. In this embodiment, the detection stage also includes a second detection writing stage, which is performed after the current output stage. In the second detection data writing stage, the first scan signal Scan1 is at the on level, the data writing module 10 is turned on, and the setting data voltage is written to the control terminal G of the driving module 20. Figure 1 The output end of the pixel circuit can be connected to the light-emitting device OLED, wherein the first end of the driving module 20 can serve as the output end of the pixel circuit.

[0072] In some optional embodiments of the present invention, the data voltage is set to turn off the driver module 20. In this way, after the pixel circuit outputs the detection current in the current output stage, the driver module 20 is turned off and no current is generated, so that the light-emitting device OLED will not light up, and the threshold voltage detection of the driver module 20 is realized in the off-screen state. Therefore, the threshold voltage detection process of the driver module 20 will not affect the normal display of the display screen, thereby improving the user experience. Optionally, the size of the detection data voltage satisfies that the light-emitting device OLED will not light up in the current output stage, further ensuring that the threshold voltage detection of the driver module 20 can be realized in the off-screen state. In addition, in the second detection stage, the data writing module 10 writes a set data voltage to the driving module 20 in response to the first scanning signal Scan1. When the set data voltage satisfies the requirement to turn off the driving module 20, the driving module 20 can be turned off after each pixel circuit connected to the sensing signal line Sense outputs the detection current to the sensing signal line Sense in the current output stage, thereby preventing the pixel circuit from continuing to be turned on and transmitting current to the sensing signal line Sense after outputting the detection current to the sensing signal line Sense in the current output stage, resulting in inaccurate detection current of other pixel circuits connected to the sensing signal line Sense in the current output stage, thereby improving the detection accuracy of the threshold voltage of the driving module 20, and accordingly, improving the compensation accuracy of the threshold voltage of the driving module 20, thereby improving the display effect.

[0073] In other optional embodiments of the present invention, the data voltage is set to the display data voltage corresponding to the pixel circuit in the display stage. In this way, after the pixel circuit outputs the detection current to the sensing signal line Sense in the current output stage, the normal display screen in the display stage can be restored, that is, the threshold voltage of the bright screen detection driving module 20 can be realized, and it is ensured that after the threshold voltage of the driving module 20 is detected, the display can still be performed normally, and the impact of the threshold voltage detection process of the driving module 20 on the normal display screen of the display panel is reduced, thereby improving the user experience.

[0074] Step 140 : In the display stage, the data writing module writes a display data voltage to the control terminal of the driving module in response to the first scanning signal.

[0075] The display stage may include a data writing stage. In the data writing stage, the first scanning signal Scan1 is at a conduction level, so that the data writing module 10 is turned on, and the display data voltage is written to the control end of the driving module 20. The driving module 20 can display the picture according to the display data voltage to ensure that the picture is displayed normally in the display stage.

[0076] The driving method of the pixel circuit of the present embodiment is as follows: in the current output stage, the driving module generates a detection current according to the detection data voltage and the initial voltage, the detection module transmits the detection current to the sensing signal line in response to the second scanning signal, and in the second detection writing stage, the data writing module writes the set data voltage to the control end of the driving module in response to the first scanning signal. The setting data voltage satisfies the driving module to turn off, and the threshold voltage detection of the driving module can be realized in the off-screen state. Therefore, the threshold voltage detection process of the driving module will not affect the normal display of the display screen, thereby improving the user experience. In addition, the setting data voltage satisfies the driving module to turn off, thereby preventing the pixel circuit from continuing to conduct and transmitting current to the sensing signal line after outputting the detection current to the sensing signal line in the current output stage, thereby improving the compensation accuracy of the threshold voltage of the driving module and improving the display effect. Alternatively, setting the data voltage to the display data voltage corresponding to the pixel circuit in the display stage can enable the pixel circuit to restore the normal display image in the display stage after outputting the detection current to the sensing signal line in the current output stage, thereby ensuring that the display can still be performed normally after the threshold voltage of the driving module is detected, reducing the impact of the threshold voltage detection process of the driving module on the normal display image of the display panel, and improving the user experience.

[0077] On the basis of the above technical solution, in some optional embodiments of the present invention, when the data voltage is set to turn off the driving module 20, the timing of the first scanning signal Scan1 and the second scanning signal Scan2 are the same.

[0078] Since the second scan signal Scan2 is at the on level in the current output stage, correspondingly, the first scan signal Scan1 is also at the on level in the current output stage, so that the data writing module 10 is turned on, and the detection data voltage is continuously written to the control end of the driving module 20, so that the potential of the control end of the driving module 20 can be more stably maintained at the detection data voltage in the current output stage, which is conducive to improving the detection accuracy of the threshold voltage of the driving module 20. Since the first scan signal Scan1 is at the on level in the second detection writing stage, correspondingly, the second scan signal Scan2 is also at the on level in the current output stage, so that the detection module 30 is turned on. However, since the driving module 20 is turned off in the second detection writing stage, even if the detection module 30 is turned on, it will not transmit current to the sensing signal line Sense, so as to ensure that the threshold voltage detection of other pixel circuits connected to the same sensing signal line Sense will not be affected. By setting the timing of the first scan signal Scan1 and the second scan signal Scan2 to be the same, the first scan signal Scan1 and the second scan signal Scan2 can be provided by the same scan line, which can reduce the number of signal lines in the display panel, thereby simplifying wiring and helping to improve the pixel density of the display panel.

[0079] In another optional embodiment of the present invention, the driving method further includes: in the second detection writing phase, the detection module is turned off in response to the second scanning signal.

[0080] Specifically, in the second detection and writing stage, the second scanning signal Scan2 can be a turn-off level, and the turn-off level of the second scanning signal Scan2 is a level that can turn off the detection module 30, so that the detection module 30 is turned off in the second detection and writing stage, that is, in the second detection and writing stage, the detection module 30 and the driving module 20 are both turned off, and the two modules are turned off in series, which can further avoid leakage current flowing into the detection signal line in the second detection stage, and further ensure the detection accuracy of the threshold voltage of the driving module 20 by each pixel circuit connected to the sensing signal line Sense, thereby further improving the compensation accuracy of the threshold voltage and improving the display effect.

[0081] On the basis of the above embodiments, optionally, the data voltage is set to the display data voltage corresponding to the pixel circuit in the target display stage, and the target display stage is the display stage before or after the detection stage and continuous with the detection stage; with such a setting, the detection stage can have less impact on the continuity of the picture in the display stage, thereby ensuring that the display panel can display the picture normally without interrupting the normal display process due to the detection stage.

[0082] Figure 3 This is a schematic diagram of another pixel circuit in the related art. Figure 3Optionally, the data writing module 10 includes a first transistor T1, the driving module 20 includes a driving transistor DT, the detecting module 30 includes a second transistor T2, and the storage module 40 includes a first capacitor Cst. The first transistor T1, the second transistor T2 and the driving transistor DT may be P-type transistors or N-type transistors, which are not specifically limited in this embodiment. Figure 3 The schematic diagram shows the case where the first transistor T1, the second transistor T2 and the third transistor are all N-type transistors. Accordingly, the on-levels of the first scanning signal Scan1 and the second scanning signal Scan2 are both high level, and the off-levels are both low level. Figure 1 and Figure 3 The first end of the driving module 20 can be connected to the anode of the light-emitting device OLED, and the cathode of the light-emitting device OLED is connected to the first power supply voltage input terminal VSS; the second end of the driving module 20 is connected to the second power supply voltage input terminal VDD. Figure 4 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention, Figure 4 The drive timing shown can be used to drive Figure 3 The pixel circuit shown, reference Figure 4 The working process of the pixel circuit in the detection phase includes a first detection writing phase t1, a current output phase t2 and a second detection writing phase t3.

[0083] In the first detection writing stage t1, the first scanning signal Scan1 is at a high level, the first transistor T1 is turned on, and the detection data voltage is written into the gate of the driving transistor DT; the second scanning signal Scan2 is at a high level, the second transistor T2 is turned on, and the initial voltage is written into the source of the driving transistor DT.

[0084] In the current output stage t2, the driving transistor DT is turned on according to the detection data voltage of the gate and the initial voltage of the source. The absolute value of the difference between the detection data voltage and the initial voltage is greater than the absolute value of the threshold voltage of the driving transistor DT, and the driving transistor DT is turned on to generate a detection current. In the current output stage, the second scanning signal Scan2 is at the on level, the second transistor T2 is turned on, and the detection current is transmitted to the sensing signal line Sense. The sensing signal line Sense can transmit the detection current to an external threshold voltage detection circuit. The external threshold voltage detection circuit determines the threshold voltage of the driving module 20 according to the sensing current on the sensing signal line Sense in the current output stage. In the current output stage, the first scanning signal Scan1 can be a high level or a low level, which is not specifically limited in this embodiment. Figure 4The schematic diagram shows the case where the first scan signal Scan1 is at a high level. The first transistor T1 is turned on in response to the high-level first scan signal Scan1, and the detection data voltage is continuously written into the gate of the driving transistor DT, so that the gate of the driving transistor DT can be stabilized at the detection data voltage.

[0085] In the second detection and writing stage t3, the first scanning signal Scan1 is at a high level, the first transistor T1 is turned on, and the set data voltage is written to the gate of the driving transistor DT. The set data voltage is sufficient to turn off the driving transistor DT, or the set data voltage is the display data voltage of the display stage, which can ensure that the threshold detection process has little impact on the normal display process and improve the user experience.

[0086] An embodiment of the present invention further provides a display device, Figure 5 is a schematic structural diagram of a display device provided by an embodiment of the present invention, Figure 6 is a schematic structural diagram of another display device provided by an embodiment of the present invention, Figure 7 It is a schematic diagram of the structure of the connection between the pixel circuit and the integration module. Figure 5 and Figure 6 The display device shown in FIG. 1 is connected with the pixel circuit and the integration module 50 as shown in FIG. Figure 7 shown.

[0087] refer to Figure 5-Figure 7 The display device includes a plurality of pixel circuits, and the pixel circuits are driven by the driving method of the pixel circuit of any of the above embodiments of the present invention.

[0088] Continue to refer Figure 5-Figure 7 Optionally, the display device further includes a plurality of first scan lines S1, a plurality of second scan lines S2, a plurality of data lines Data and a plurality of sensing signal lines Sense; the control end of the data writing module 10 is electrically connected to the first scan line S1, the first end of the data writing module 10 is electrically connected to the data line Data, and the second end of the data writing module 10 is electrically connected to the control end of the driving module 20; the control end of the detection module 30 is electrically connected to the second scan line S2, the first end of the detection module 30 is electrically connected to the sensing signal line Sense, and the second end of the detection module 30 is electrically connected to the first end of the driving module 20.

[0089] The first scan line S1 connected to the first row of pixel circuits is recorded as the first scan line one S11, and the second scan line S2 connected to the first row of pixel circuits is recorded as the second scan line one S21. The first scan line S1 connected to the second row of pixel circuits is recorded as the first scan line two S12, and the second scan line S2 connected to the second row of pixel circuits is recorded as the second scan line two S22. The first scan line S1 connected to the n-th row of pixel circuits is recorded as S1n, and the second scan line S2 connected to the n-th row of pixel circuits is recorded as S2n, where n is a positive integer.

[0090] Optionally, when the data voltage is set to turn off the driving module 20, the first scan line S1 is multiplexed as the second scan line S2, that is, the control end of the data writing module 10 and the control end of the detection module 30 are connected to the same scan line, so that the number of wirings in the display panel can be reduced.

[0091] Optionally, each first scan line S1 corresponds to a data writing module 10 connected to at least one row of pixel circuits, and each second scan line S2 corresponds to a detection module 30 connected to at least one row of pixel circuits; each data line Data is connected to a data writing module 10 of at least one column of pixel circuits, and each sensing signal line Sense is connected to a detection module 30 of a column of pixel circuits.

[0092] In the present embodiment, the sensing signal line Sense is connected to the detection module 30 of a column of pixel circuits, so that after each pixel circuit connected to the sensing signal line Sense outputs the detection current to the sensing signal line Sense in the current output stage, the driving module 20 is turned off, so as to prevent the pixel circuit from continuing to be turned on and transmitting current to the sensing signal line Sense after outputting the detection current to the sensing signal line Sense in the current output stage, resulting in inaccurate detection current of other pixel circuits connected to the sensing signal line Sense in the current output stage, thereby improving the detection accuracy of the threshold voltage of the driving module 20, and accordingly, improving the compensation accuracy of the threshold voltage of the driving module 20, thereby improving the display effect.

[0093] Optionally, the display device also includes an initial voltage input terminal Vref and at least one first control switch SW1, the initial voltage input terminal Vref is connected to at least one sensing signal line Sense through the first control switch SW1; the first control switch SW1 is used to be turned on in the first detection writing phase of each pixel circuit and turned off in the current output phase of each pixel circuit under the control of a first control signal.

[0094] refer to Figure 5In some optional embodiments of the present invention, the display device includes a first control switch SW1, and the initial voltage input terminal VREF is connected to each sensing signal line Sense through the first control switch SW1, so that the number of first control switches SW1 in the display panel can be reduced. When the first control switch SW1 is located in the display area, the occupied area of ​​the first control switch SW1 in the display area can be reduced, which is beneficial to improving the pixel density; when the first control switch SW1 is located in the non-display area, the occupied area of ​​the first control switch SW1 in the non-display area can be reduced, reducing the border width.

[0095] refer to Figure 6 In another optional embodiment of the present invention, the display device may include at least two first control switches SW1, the first ends of the first control switches SW1 are electrically connected to the initial voltage input terminal Vref, and the second ends of the first control switches SW1 are connected to at least one sensing signal line Sense. By setting at least two first control switches SW1, the number of sensing signal lines Sense connected to a single first control switch SW1 can be reduced, and the current carrying capacity of the first control switch SW1 can be reduced. In some optional embodiments of the present invention, the display device includes a plurality of first control switches SW1, and the first control switches SW1 are electrically connected to the sensing signal lines Sense in a one-to-one correspondence, so as to reduce the current carrying capacity requirements of the first control switches SW1 to a greater extent. Among them, when the display device includes at least two first control switches SW1, the first control signals connected to each first control switch SW1 are the same, that is, each first control switch SW1 is turned on and off at the same time.

[0096] Specifically, in the first detection writing stage of each row of pixel circuits, the first control signal is at the on level, so that the first control switch SW1 is turned on, and the initial voltage input by the initial voltage input terminal Vref is transmitted to the sensing signal line Sense, and the initial voltage is transmitted to the first end of the driving module 20 through the detection module 30 of the pixel circuit of the row that is turned on. In the second detection writing stage of each row of pixel circuits, the first control signal is at the off level, so that the first control switch SW1 is turned off, and the connection between the initialization voltage input terminal and the first sensing signal line Sense is cut off, so that in the second detection writing stage of each row of pixel circuits, the detection current can be transmitted to the external threshold voltage detection circuit through the sensing signal line Sense.

[0097] On the basis of the above technical solutions, optionally, the first control switch SW1 is further used to be turned off in the second detection writing stage of each pixel circuit under the control of the first control signal. Specifically, in the second detection writing stage of each row of pixel circuits, the first control signal is at the off level, so that the first control switch SW1 is turned off.

[0098] Continue to refer Figure 5-Figure 7Optionally, the display device further includes an integration module 50, the input end of the integration module 50 is electrically connected to the sensing signal line Sense, and the output end of the integration module 50 is connected to the detection chip, which is used to determine the threshold voltage of the driving module 20 in the pixel circuit according to the signal output by the integration module 50. In some optional embodiments of the present invention, the integration module 50 can also be integrated in the detection chip. Optionally, the driving chip that outputs the data voltage in the display panel is reused as the detection chip.

[0099] Specifically, the integration module 50 can be included in an external threshold voltage detection circuit. The input end of the integration module 50 is correspondingly connected to at least one sensing signal line Sense. The integration module 50 can integrate the detection current output by the pixel circuit in the current output stage, and output the corresponding electrical signal through the output end. The electrical signal can be a voltage signal. The detection chip determines the threshold voltage of the pixel circuit driving module 20 based on the signal output by the integration module 50.

[0100] On the basis of the above technical solution, optionally, the integration module 50 includes an operational amplifier U1, an integration capacitor C0, an initialization switch INTRST and a sampling switch SMP, the non-inverting input terminal of the operational amplifier U1 is connected to the reference voltage, and the inverting input terminal of the operational amplifier U1 is electrically connected to the input terminal of the integration module 50; the integration capacitor C0 and the initialization switch INTRST are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 is connected to the output terminal of the integration module 50 through the sampling switch SMP; the initialization switch INTRST is used to be turned on before the current output stage of the pixel circuit connected to the integration module 50 and / or during the setting period of the current output stage, and the setting period includes at least a part of the setting time of entering the current output stage, and the setting time is less than the total time of the current output stage; the sampling switch SMP is used to be turned on during the current output stage of the pixel circuit connected to the integration module 50; the output terminal of the operational amplifier U1, the integration capacitor C0, the initialization switch INTRST and the sampling switch SMP are connected to the same node. Exemplarily, the setting period includes the time period from the first 1 / 3 to the first 1 / 2 of the current output stage.

[0101] Specifically, the initialization switch INTRST is turned on before the current output stage, and / or the initialization switch INTRST is turned on during the set period of the current output stage, so that the operational amplifier U1 can be initialized to ensure that the last integration result will not affect the current integration result, thereby improving the accuracy of the threshold voltage detection. The sampling switch SMP is turned on during the current output stage of the pixel circuit connected to the integration module 50, and the integration result of the integration module 50 can be output to the detection chip, so that the integration module 50 can determine the threshold voltage of the driving module 20 in the pixel circuit according to the integration result.

[0102] Optionally, each integration module 50 is connected to at least two sensing signal lines Sense through a switch module 60, and the switch module 60 includes at least two second control switches SW2, and the second control switch SW2 is electrically connected to the sensing signal line Sense through its own first end in a one-to-one correspondence, and the second end of the second control switch SW2 is electrically connected to the input end of the integration module 50; the switch module 60 is used to select different second control switches SW2 according to the second control signal connected to the second control switch SW2 during the current output stage of the different columns of pixel circuits connected, wherein the second control signals connected to different second control switches SW2 are different.

[0103] Specifically, in this embodiment, by setting a switch module 60 including at least two second control switches SW2, the control ends of different control switches of the same switch module 60 are connected to different control signals, so that different control switches SW2 in the same switch module 60 are turned on in different time periods, and then the threshold voltage detection cycle of the threshold voltage of the driver module 20 can be divided into multiple time periods to detect the threshold voltage of the driver module 20 of the pixel circuit connected to a second control switch SW2 in the switch module 60. For each pixel circuit, in a detection cycle, the working process of the pixel circuit includes a first detection writing stage, a current output stage and a second detection writing stage. Such a setting can reduce the number of integration modules 50 in the display device, which can save costs on the one hand, and on the other hand, the integration module 50 is set in the non-display area of ​​the display device. The reduction in the number of integration modules 50 can save the total occupied area of ​​each integration module 50, reduce the frame width, and facilitate the realization of a narrow frame.

[0104] Continue to refer Figure 6In an optional embodiment of the present invention, in the display device, sub-pixels of the same color are located in the same column. Each integration module 50 can be connected to three sensing signal lines Sense through a switch module 60. The switch module 60 includes three second control switches SW2 (respectively recorded as a second control switch SWR, a second control switch SWG, and a second control switch SWB). Each second control switch SW2 is connected to a column of pixel circuits through a sensing signal line Sense. One of the three sensing signal lines Sense is connected to a pixel circuit corresponding to a column of red sub-pixels, one is connected to a pixel circuit corresponding to a column of green sub-pixels, and another is connected to a pixel circuit corresponding to a column of blue sub-pixels. In each switch module 60, the control end of the second control switch SWR connected to the red sub-pixel column is connected to the same control signal, the control end of the second control switch SWG connected to the green sub-pixel column is connected to the same control signal, and the control end of the second control switch SWB connected to the blue sub-pixel column is connected to the same control signal. Different second control switches SW2 of the same switch module 60 are connected to different control signals. With such an arrangement, the driving module 20 in the pixel circuit corresponding to the red sub-pixel, the driving module 20 in the pixel circuit corresponding to the blue sub-pixel, and the driving module 20 in the pixel circuit corresponding to the green sub-pixel can detect the threshold voltage in different detection cycles, thereby avoiding mutual influence between the threshold voltage detection processes of the pixel circuits corresponding to sub-pixels of different colors. Figure 6 In the display device shown, the data line connected to the pixel circuit corresponding to the red sub-pixel column is recorded as the first data line DataR, the data line connected to the pixel circuit corresponding to the green sub-pixel column is recorded as the second data line DataG, and the data line connected to the pixel circuit corresponding to the blue sub-pixel column is recorded as the third data line DataB.

[0105] An embodiment of the present invention further provides a method for driving a display device, wherein the method for driving a display device is used to drive the display device of any of the above embodiments of the present invention. Figure 8 is a flow chart of a method for driving a display device provided by an embodiment of the present invention. Fig. 9 is a driving timing diagram of a display device provided by an embodiment of the present invention, wherein: Fig. 9 The driving timing of two rows of pixel circuits (first row of pixel circuits and second row of pixel circuits) in the display panel is schematically shown in FIG. Figure 5 The display panel shown, refer to Figure 8 and Fig. 9 , the driving method of the display device includes:

[0106] Step 210: Control multiple rows of pixel circuits to enter the detection phase in sequence.

[0107] Among them, the detection stage t0 includes a first detection writing stage t1, a current output stage t2 and a second detection writing stage t3 which are performed in chronological order. As described in the above embodiment, when the threshold voltage detection is performed on the driving module of the pixel circuit in the display device, it can be off-screen detection or on-screen detection. In the case of off-screen detection, a program can be pre-set in the detection chip of the display device. Optionally, when the duration from the last detection stage is greater than or equal to the preset duration, and the display device is obtained to be in an off-screen state, the off-screen detection can be triggered. In the case of on-screen detection, the corresponding trigger conditions can also be set in the detection chip, and the on-screen detection is performed after the trigger conditions are met. Regardless of off-screen detection or on-screen detection, it is necessary to control multiple rows of pixel circuits to enter the detection stage in sequence, for example, controlling the pixel circuits to enter the detection stage row by row. Reference Fig. 9 After the detection phase of one row of pixels is completed, the detection phase of the next row of pixel circuits can be entered. Wherein, t01 is the detection phase of the first row of pixel circuits, and t02 is the detection phase of the second row of pixel circuits.

[0108] Step 220, in the first detection and writing stage of the pixel circuit, a detection data voltage is provided to the data line connected to the pixel circuit, and a first scanning signal of a conduction level is provided to the first scanning line connected to the pixel circuit, and a data writing module is controlled to write the detection data voltage to the control end of the driving module; and an initial voltage is provided to the sensing signal line connected to the pixel circuit, and a second scanning signal of a conduction level is provided to the second scanning line connected to the pixel circuit, and the detection module is controlled to write the initial voltage to the first end of the driving module.

[0109] Exemplarily, in the first detection writing stage of the first row of pixel circuits, a detection data voltage is provided to the data line connected to the row of pixel circuits, and a first scanning signal of a conduction level is provided to the first scanning line (first scanning line S11) connected to the row of pixel circuits, and the data writing module is controlled to write the detection data voltage to the control end of the driving module; a second scanning signal of a conduction level is provided to the second scanning line (second scanning line S21) connected to the row of pixel circuits, so that the detection module is turned on to write the initial voltage to the first end of the driving module. The same is true for the first detection writing stage of the second row of pixel circuits, which will not be repeated here.

[0110] Combination Figure 5 Optionally, in the above step 220, in the first detection writing phase of the pixel circuit, providing an initial voltage to the sensing signal line connected to the pixel circuit includes: in the first detection writing phase of the pixel circuit, providing a first control signal of a conduction level to the first control switch to turn on the first control switch, transmitting the initial voltage to the sensing signal line, so as to initialize the first end of the driving module and the integration module. Fig. 9The driving timing sequence shown may correspond to a situation where the first control switch includes an N-type transistor and the conduction level of the first control signal is a high level.

[0111] Step 230, in the current output stage of the pixel circuit, shut off the initial voltage provided to the sensing signal line connected to the pixel circuit, and provide a second scanning signal of a conduction level to the second scanning line connected to the pixel circuit, and control the detection module to transmit the detection current output by the driving module to the correspondingly connected sensing signal line.

[0112] For example, in the current output stage of the first row of pixel circuits, a second scanning signal of a conduction level is provided to the second scanning line (second scanning line S21) connected to the pixel circuit of the row, so that the detection module is turned on to transmit the detection current output by the driving module to the corresponding connected sensing signal line. The same is true for the current output stage of the second row of pixel circuits, which will not be described in detail here.

[0113] Combination Figure 5 Optionally, in the above step 230, in the current output stage of the pixel circuit, the initial voltage provided to the sensing signal line connected to the pixel circuit is turned off, including: in the current output stage of the pixel circuit, a first control signal of an off level is provided to the first control switch to turn off the first control switch, thereby turning off the initial voltage provided to the sensing signal line connected to the pixel circuit. Optionally, the driving method of the display device also includes: in the current output stage of the pixel circuit, one of the second control switches of the switching module is turned on to transmit the detection current to the input end of the integration module through the sensing signal line, and at least in the last period of the current output stage of the pixel circuit, the sampling switch SMP in the integration module is controlled to be turned on to transmit the output signal of the integration module to the detection chip. Among them, Fig. 9 The driving timing shown may correspond to the case where the second control switch includes an N-type transistor and the conduction level of the second control signal is a high level. In some optional embodiments, the end period includes the second half of the current output stage. In another part of the optional embodiments, the end period includes the last 1 / nth period of the current output stage, where n is greater than 2, and exemplary, n=3, 4, 5, 8, 10 or 15.

[0114] Step 240, in the second detection writing phase of the pixel circuit, providing a set data voltage to the data line connected to the pixel circuit, and providing a first scanning signal of a conduction level to the first scanning line connected to the pixel circuit, and controlling the data writing module to write the set data voltage to the driving module.

[0115] For example, in the second detection writing stage of the first row of pixel circuits, a first scanning signal of a conduction level is provided to the first scanning line (first scanning line S11) connected to the pixel circuit of the row, so that the data writing module is turned on to write the set data voltage to the control end of the driving module. The same is true for the second detection writing stage of the second row of pixel circuits, which will not be repeated here.

[0116] The data voltage is set to be sufficient to turn off the driving module, or the data voltage is set to be a data voltage corresponding to the pixel circuit in the display stage.

[0117] The driving method of the display device of this embodiment is used to drive the display device of any of the above embodiments of the present invention, and has the beneficial effects of the display device of any of the above embodiments of the present invention, which will not be described in detail here.

[0118] Fig.10 is a driving timing diagram of another display device provided by an embodiment of the present invention. The driving timing diagram can be used to drive Figure 6 The display panel shown in the driving timing schematically shows the situation of detecting the threshold voltage of the driving module in the pixel circuit corresponding to the red sub-pixel in the display panel, and schematically shows the driving timing of the first two rows of pixel circuits. Figure 6 and Fig.10 ,and Fig. 9 The difference between the drive timing shown is that Fig.10 In the driving timing shown, when the threshold voltage is detected for the driving module in the pixel circuit corresponding to the red sub-pixel, in the first detection writing stage, the detection data voltage can be provided only to the first data line DataR connected to the pixel circuit corresponding to the red sub-pixel, and in the second detection writing stage, the set data voltage can be provided only to the first data line DataR connected to the pixel circuit corresponding to the red sub-pixel. And the second control switch 1 SWR connected to the red sub-pixel column is controlled to be turned on (a low level is provided to the second control switch 1 SWR), and the second control switch 2 SWG connected to the green sub-pixel column (a low level is provided to the second control switch 2 SWG) and the second control switch 3 SWB connected to the blue sub-pixel column (a low level is provided to the second control switch 3 SWB) are turned off. Among them, Fig.10 The driving timing sequence shown may correspond to the second control switch including a P-type transistor, the on-level of the second control switch being a low level, and the off-level being a high level.

[0119] Continue to refer Figure 5 Based on the above technical solution, optionally, the display device includes at least one display area, and the display area includes at least one row of pixel circuits. Figure 5 FIG. 4 schematically shows a case where the display device includes two display areas, namely a first display area AA1 and a second display area AA2 .

[0120] In the above embodiment, step 210 controls the plurality of rows of pixel circuits to enter the detection phase in sequence, including: controlling the pixel circuits of each row in the set display area to enter the detection phase in sequence.

[0121] The display area is set to be one of the at least one display area. Specifically, in this embodiment, the pixel circuits of different display areas of the display device can be controlled in time periods to detect the threshold voltage, thereby avoiding the situation where the threshold voltage of the driving module in each pixel circuit in the display device cannot be accurately detected due to the detection phase being too short, thereby ensuring the accuracy of the detection of the threshold voltage of the driving module of the pixel circuit in each display area.

[0122] In some optional embodiments of the present invention, the detection phase is located between two adjacent display phases. This arrangement can realize the bright screen detection of the threshold voltage of the driving module in the pixel circuit and ensure that the display image has good continuity.

[0123] Optionally, the driving method of the display device further includes: in each display stage, sequentially providing a first scanning signal of a conduction level to each first scanning line, and providing a display data voltage to each data line, so that each row of pixel circuits sequentially writes the display data voltage, and the driving module generates a driving current according to the display data voltage. The driving current generated by the driving module can be output to the light-emitting device, thereby driving the light-emitting device to emit light for display.

[0124] In some optional embodiments of the present invention, the detection stage is located in the inter-frame blanking area. Specifically, the display stage may include multiple display frames, and in each display frame, data voltages may be written to the pixel circuits row by row. The inter-frame blanking area is the time period between the writing of data voltages to the last row of pixel circuits in the display panel of the previous display frame and the writing of data voltages to the first row of pixel circuits in the display panel of the next display frame in two adjacent display frames. Therefore, the time of the inter-frame blanking area is usually short. By controlling the pixel circuits of each row in the set display area to enter the detection stage in sequence when the detection stage is located in the inter-frame blanking area, it is possible to avoid the situation where the detection stage is too short, resulting in the inability to accurately detect the threshold voltage of the driving module in each pixel circuit in the display device, thereby ensuring the accuracy of the detection of the threshold voltage of the driving module of the pixel circuit in the set display area.

[0125] In some optional embodiments of the present invention, the display device includes at least two display areas, and the display area is set to be one of the at least two display areas. Optionally, controlling the pixel circuits in each row in the display area to enter the detection stage in sequence includes: between different display stages, controlling the pixel circuits in each row in different display areas to enter the detection stage in sequence. In this way, the threshold voltage of the driving module of the pixel circuit in each display area in the display panel can be detected, and the accuracy of the detected threshold voltage can be ensured.

[0126] 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 described herein, and that various obvious changes, readjustments 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 method for driving a pixel circuit, characterized in that: The pixel circuit includes a data writing module, a driving module, and a detection module; the driving method includes a display stage and a detection stage, and the detection stage includes a first detection writing stage, a current output stage, and a second detection writing stage; the driving method includes: In the first detection writing stage, the data writing module writes a detection data voltage to the control end of the driving module in response to a first scanning signal, and the detection module writes an initial voltage to the first end of the driving module in response to a second scanning signal; In the current output stage, the driving module generates a detection current according to the detection data voltage and the initial voltage, and the detection module transmits the detection current to the sensing signal line in response to the second scanning signal; In the second detection writing stage, the data writing module writes a set data voltage to the control terminal of the driving module in response to the first scanning signal; The set data voltage is sufficient to turn off the driving module, or the set data voltage is a display data voltage corresponding to the pixel circuit in a display stage.

2. The driving method of the pixel circuit according to claim 1, characterized in that: The set data voltage is sufficient to turn off the driving module; and the timing of the first scanning signal and the second scanning signal is the same.

3. The driving method of the pixel circuit according to claim 1, characterized in that: The driving method further comprises: In the second detection writing phase, the detection module is turned off in response to the second scanning signal.

4. The driving method of the pixel circuit according to claim 1, characterized in that: The set data voltage is the display data voltage corresponding to the pixel circuit in a target display phase, and the target display phase is the display phase before or after the detection phase and continuous with the detection phase.

5. The driving method of the pixel circuit according to claim 1, characterized in that: Also includes: In the display stage, the data writing module writes the display data voltage to the control terminal of the driving module in response to the first scanning signal; Preferably, the pixel circuit also includes a storage module, a first end of the storage module is electrically connected to the control end of the driving module, a second end of the storage module is electrically connected to the first end of the driving module, and the storage module is used to store and maintain the voltage difference between the control end and the first end of the driving module.

6. A display device, characterized in that: The invention comprises a plurality of pixel circuits, wherein the pixel circuits are driven by the driving method of the pixel circuit according to any one of claims 1 to 5.

7. The display device according to claim 6, characterized in that: The display device further includes a plurality of first scan lines, a plurality of second scan lines, a plurality of data lines and a plurality of sensing signal lines; The control end of the data writing module is electrically connected to the first scanning line, the first end of the data writing module is electrically connected to the data line, and the second end of the data writing module is electrically connected to the control end of the driving module; The control end of the detection module is electrically connected to the second scanning line, the first end of the detection module is electrically connected to the sensing signal line, and the second end of the detection module is electrically connected to the first end of the driving module; Preferably, the set data voltage is sufficient to turn off the driving module; the first scan line is multiplexed as the second scan line; Preferably, each of the first scanning lines is connected to the data writing module of at least one row of the pixel circuits, and each of the second scanning lines is connected to the detection module of at least one row of the pixel circuits; each of the data lines is connected to the data writing module of at least one column of the pixel circuits, and each of the sensing signal lines is connected to the detection module of one column of the pixel circuits; Preferably, the display device further comprises an initial voltage input terminal and at least one first control switch, wherein the initial voltage input terminal is connected to at least one of the sensing signal lines through the first control switch; the first control switch is used to be turned on in the first detection writing phase of each of the pixel circuits and turned off in the current output phase of each of the pixel circuits under the control of a first control signal; Preferably, the first control switch is further used to be turned off in the second detection and writing phase of each pixel circuit under the control of the first control signal; Preferably, the display device comprises a plurality of the first control switches, and the first control switches are electrically connected to the sensing signal lines in a one-to-one correspondence; Preferably, the display device further comprises an integration module, the input end of the integration module is electrically connected to at least one of the sensing signal lines, the output end of the integration module is connected to a detection chip, and the detection chip is used to determine the threshold voltage of the driving module in the pixel circuit according to the signal output by the integration module; The integration module includes an operational amplifier, an integration capacitor, an initialization switch and a sampling switch. The non-inverting input terminal of the operational amplifier is connected to a reference voltage, and the inverting input terminal of the operational amplifier is electrically connected to the input terminal of the integration module; the integration capacitor and the initialization switch are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the output terminal of the integration module through the sampling switch; the initialization switch is used to be turned on before the current output stage of the pixel circuit connected to the integration module and / or during a set period of the current output stage, and the set period includes at least a part of the set time of entering the current output stage, and the set time is less than the total time of the current output stage; the sampling switch is used to be turned on during the current output stage of the pixel circuit connected to the integration module; the output terminal of the operational amplifier, the integration capacitor, the initialization switch and the sampling switch are connected to the same node; Preferably, each of the integration modules is connected to at least two of the sensing signal lines via a switch module, the switch module comprises at least two second control switches, the second control switches are electrically connected to the sensing signal lines one-to-one via their first ends, and the second ends of the second control switches are electrically connected to the input ends of the integration modules; the switch module is used to select different second control switches according to the second control signals connected to the second control switches during the current output stage of the pixel circuits of different connected columns, wherein the second control signals connected to different second control switches are different.

8. A method for driving a display device, characterized in that: include: Controlling multiple rows of pixel circuits to enter the detection phase in sequence; In the first detection writing stage of the pixel circuit, a detection data voltage is provided to the data line connected to the pixel circuit, and a first scanning signal of a conduction level is provided to the first scanning line connected to the pixel circuit, and a data writing module is controlled to write the detection data voltage to the control end of the driving module; and an initial voltage is provided to the sensing signal line connected to the pixel circuit, and a second scanning signal of a conduction level is provided to the second scanning line connected to the pixel circuit, and a detection module is controlled to write the initial voltage to the first end of the driving module; In the current output phase of the pixel circuit, the initial voltage provided to the sensing signal line connected to the pixel circuit is turned off, and a second scanning signal of a conduction level is provided to the second scanning line connected to the pixel circuit, so as to control the detection module to transmit the detection current output by the driving module to the correspondingly connected sensing signal line; In the second detection writing phase of the pixel circuit, a set data voltage is provided to the data line connected to the pixel circuit, and a first scanning signal of a conduction level is provided to the first scanning line connected to the pixel circuit, so as to control the data writing module to write the set data voltage to the driving module; The set data voltage is sufficient to turn off the driving module, or the set data voltage is a data voltage corresponding to the pixel circuit in the display stage.

9. The method for driving a display device according to claim 8, characterized in that: The display device includes at least one display area, the display area includes at least one row of pixel circuits, and the controlling of the plurality of rows of pixel circuits to sequentially enter the detection phase includes: Controlling the pixel circuits in each row in a set display area to enter a detection phase in sequence; the set display area is one of at least one of the display areas; Preferably, the detection phase is located between two adjacent display phases; The driving method of the display device further includes: In each display stage, a first scanning signal of a conduction level is sequentially provided to each of the first scanning lines, and a display data voltage is provided to each of the data lines, so that the pixel circuits of each row are sequentially written with the display data voltage, and the driving module generates a driving current according to the display data voltage; Preferably, the detection stage is located in the inter-frame blanking area; Preferably, the display device comprises at least two display areas; Preferably, the control setting the pixel circuits in each row in the display area to enter the detection phase in sequence includes: Between different display phases, each row of pixel circuits in different display areas is controlled to enter the detection phase in sequence.

10. The method for driving a display device according to claim 9, wherein: In the first detection writing phase of the pixel circuit, providing an initial voltage to a sensing signal line connected to the pixel circuit comprises: In the first detection writing phase of the pixel circuit, a first control signal of a conduction level is provided to the first control switch to turn on the first control switch, and the initial voltage is transmitted to the sensing signal line to initialize the first end of the driving module and the integration module; In the current output phase of the pixel circuit, shutting off the initial voltage provided to the sensing signal line connected to the pixel circuit comprises: In the current output phase of the pixel circuit, providing a first control signal of an off level to the first control switch, so that the first control switch is turned off, thereby turning off the initial voltage provided to the sensing signal line connected to the pixel circuit; The driving method further comprises: In the current output phase of the pixel circuit, one of the second control switches of the switch module is turned on to transmit the detection current to the input end of the integration module through the sensing signal line, and at least in the end period of the current output phase of the pixel circuit, the sampling switch in the integration module is controlled to be turned on to transmit the output signal of the integration module to the detection chip; Preferably, the end period includes the second half of the current output phase.

Images