Driving method of pixel circuit, display device and driving method thereof

Abstract

The embodiment of the present application 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, and a detection module transmits the detection current to a sensing signal line in response to a second scanning signal. In a second detection writing stage, a data writing module writes a set data voltage to a control end of the driving module in response to a first scanning signal. The set data voltage satisfies the condition of turning off the driving module, threshold voltage detection of the driving module in an off-screen state can be realized, and the threshold voltage detection process of the driving module does not affect normal display of a display picture. In addition, the set data voltage satisfies the condition of turning off the driving module, and the compensation accuracy of the threshold voltage of the driving module can be improved. Alternatively, the set data voltage is a display data voltage corresponding to the pixel circuit in a display stage, and the influence of the threshold voltage detection process of the driving module on normal display of a display picture of the display panel is reduced.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a method for driving a pixel circuit, a display device, and the same. Background Technology

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

[0003] In a display panel, uneven threshold voltages of the driving transistors in different pixel circuits can lead to poor uniformity of the displayed image. Therefore, it is necessary to detect and compensate for the threshold voltages of the driving transistors.

[0004] However, in existing display panels, the threshold voltage detection of the driving transistors in the pixel circuit can affect the normal display process. Summary of the Invention

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

[0006] In a first aspect, embodiments of the present invention provide a driving method for a pixel circuit, the pixel circuit including a data writing module, a driving module, and a detection module; the driving method includes a display stage and a detection stage, the detection stage including a first detection writing stage, a current output stage, and a second detection writing stage; the driving method includes:

[0007] In the first detection and writing phase, the data writing module writes the detection data voltage to the control terminal of the drive module in response to the first scan signal, and the detection module writes the initial voltage to the first terminal of the drive module in response to the second scan signal.

[0008] During the current output phase, the drive module generates a detection current based on the detected data voltage and the initial voltage, and the detection module transmits the detection current to the sensing signal line in response to the second scan signal.

[0009] In the second detection and writing phase, the data writing module responds to the first scan signal and writes a set data voltage to the control terminal of the drive module.

[0010] Among them, the data voltage is set to the condition that the drive module is turned off, or the data voltage is set to the display data voltage corresponding to the pixel circuit of the display stage.

[0011] Optionally, the data voltage is set to a condition that causes the drive module to shut down; the timing of the first scan signal and the second scan signal are the same.

[0012] Optionally, the driving method also includes:

[0013] During the second detection and writing phase, the detection module shuts down in response to the second scan signal.

[0014] Optionally, the data voltage is set to the display data voltage corresponding to the pixel circuit of the target display stage, where the target display stage is a display stage that is continuous with the detection stage before or after the detection stage.

[0015] Optionally, the driving method for the pixel circuit also includes:

[0016] During the display phase, the data writing module responds to the first scan signal and writes display data voltage to the control terminal of the drive module;

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

[0018] Secondly, embodiments of the present invention also provide a display device including a plurality of pixel circuits, wherein the pixel circuits are driven by the pixel circuit driving method of the first aspect.

[0019] Optionally, the display device may also include multiple first scan lines, multiple second scan lines, multiple data lines, and multiple sensing signal lines;

[0020] The control terminal of the data writing module is electrically connected to the first scan line, the first terminal of the data writing module is electrically connected to the data line, and the second terminal of the data writing module is electrically connected to the control terminal of the drive module.

[0021] The control terminal of the detection module is electrically connected to the second scan line, the first terminal of the detection module is electrically connected to the sensing signal line, and the second terminal of the detection module is electrically connected to the first terminal of the drive module.

[0022] Optionally, the data voltage is set to a condition that causes the drive module to shut down; the first scan line is multiplexed as the second scan line.

[0023] Optionally, each first scan line corresponds to a data writing module connected to at least one row of pixel circuits, and each second scan line corresponds to a detection module connected to at least one row of pixel circuits; each data line is connected to a data writing module connected to at least one column of pixel circuits, and each sensing signal line is connected to a detection module connected to 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 turn on during the first detection and writing phase of each pixel circuit under the control of the first control signal, and to turn off during the current output phase of each pixel circuit.

[0025] Optionally, the first control switch is also used to turn off during 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, each of which is electrically connected to a sensing signal line in a corresponding manner.

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

[0028] The integration module includes an operational amplifier, an integrating capacitor, an initialization switch, and a sampling switch. The non-inverting input of the operational amplifier is connected to a reference voltage, and the inverting input is electrically connected to the input of the integration module. The integrating capacitor and the initialization switch are connected in parallel between the inverting input and output of the operational amplifier. The output of the operational amplifier is connected to the output of the integration module via the sampling switch. The initialization switch is used to turn on the pixel circuit connected to the integration module before and / or during a set period of the current output phase. The set period includes at least a portion of the set time before entering the current output phase, and the set time is less than the total time of the current output phase. The sampling switch is used to turn on the pixel circuit connected to the integration module during the current output phase. The output of the operational amplifier, the integrating 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 via a switch module. The switch module includes at least two second control switches. Each second control switch is electrically connected to a sensing signal line via its first terminal, and its second terminal is electrically connected to the input terminal 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 connected pixel circuits. The second control signals connected to the different second control switches are different.

[0030] Thirdly, embodiments of the present invention also provide a driving method for a display device, comprising:

[0031] The control circuits of multiple rows of pixels sequentially enter the detection phase;

[0032] 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 scan signal with a conduction level is provided to the first scan line connected to the pixel circuit, controlling the data writing module to write the detection data voltage to the control terminal of the driving module; and an initial voltage is provided to the sensing signal line connected to the pixel circuit, and a second scan signal with a conduction level is provided to the second scan line connected to the pixel circuit, controlling the detection module to write the initial voltage to the first terminal of the driving module.

[0033] During the current output phase of the pixel circuit, the initial voltage supplied to the sensing signal line connected to the pixel circuit is turned off, and a second scanning signal with a conduction level is provided to the second scanning line connected to the pixel circuit, controlling the detection module to transmit the detection current output by the drive module to the corresponding connected sensing signal line.

[0034] In the second detection and writing stage of the pixel circuit, a set data voltage is provided to the data line connected to the pixel circuit, and a first scan signal with a conduction level is provided to the first scan line connected to the pixel circuit to control the data writing module to write the set data voltage to the driving module.

[0035] Among them, the data voltage is set to the condition that the drive module is turned off, or the data voltage is set to the data voltage corresponding to the pixel circuit in the display stage.

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

[0037] The control sets each row of pixel circuits in the display area to enter the detection phase sequentially; the display area is set as one of at least one display area;

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

[0039] The driving method for the display device also includes:

[0040] In each display stage, a first scan signal with a conduction level is sequentially provided to each first scan line, and a display data voltage is provided 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;

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

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

[0043] Optionally, the control settings allow each row of pixel circuits in the display area to sequentially enter the detection phase, including:

[0044] Between different display stages, the pixel circuits in each row of different display areas sequentially enter the detection stage.

[0045] Optionally, during the first detection and writing phase of the pixel circuit, an initial voltage is provided to the sensing signal line connected to the pixel circuit, including:

[0046] In the first detection and writing stage of the pixel circuit, a first control signal with a conduction level is provided to the first control switch to turn on the first control switch and transmit the initial voltage to the sensing signal line to initialize the first terminal of the driving module and the integration module.

[0047] During the current output phase of the pixel circuit, the initial voltage supplied to the sensing signal line connected to the pixel circuit is turned off, including:

[0048] During the current output phase of the pixel circuit, a first control signal with a turn-off level is provided to the first control switch to turn off the first control switch and cut off the initial voltage supplied to the sensing signal line connected to the pixel circuit.

[0049] The driving method also includes:

[0050] During the current output phase of the pixel circuit, one of the second control switches of the switching module is turned on so that the detected current is transmitted to the input terminal of the integration module through the sensing signal line. At least at the end of the current output phase of the pixel circuit, the sampling switch in the integration module is turned on to transmit the output signal of the integration module to the detection chip.

[0051] Optionally, the final period includes the latter half of the current output phase.

[0052] The pixel circuit driving method, display device, and driving method of the present invention, in the current output stage, involve a driving module generating a detection current based on a detected data voltage and an initial voltage. The detection module then transmits the detection current to a sensing signal line in response to a second scan signal. In the second detection writing stage, a data writing module writes a set data voltage to the control terminal of the driving module in response to a first scan signal. The set data voltage is sufficient to turn off the driving module, enabling threshold voltage detection of the driving module in the screen-off state. Therefore, the threshold voltage detection process of the driving module does not affect the normal display of the screen, improving the user experience. Furthermore, setting the data voltage to turn off the driving module prevents the pixel circuit from continuing to conduct and transmit current to the sensing signal line after outputting the detection current to it in the current output stage, thus improving the accuracy of threshold voltage compensation for the driving module and enhancing the display effect. Alternatively, setting the data voltage to the display data voltage corresponding to the pixel circuit in the display stage allows the pixel circuit to output the detected current to the sensing signal line in the current output stage, and then restore the normal display screen in the display stage. This ensures that the display can still proceed 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 screen of the display panel and improving the user experience. Attached Figure Description

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

[0054] Figure 2 This is a flowchart of a pixel circuit driving method provided in an embodiment of the present invention;

[0055] Figure 3 This is a schematic diagram of another pixel circuit structure in related technologies;

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

[0057] Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

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

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

[0060] Figure 8 This is a flowchart of a driving method for a display device provided in an embodiment of the present invention;

[0061] Figure 9This is a driving timing diagram of a display device provided in an embodiment of the present invention;

[0062] Figure 10 This is a driving timing diagram for another display device provided in an embodiment of the present invention. Detailed Implementation

[0063] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0064] As described in the background section, existing technologies suffer from the problem that the detection of the threshold voltage of the driving transistors in pixel circuits can affect the normal display process. The inventors have discovered that in existing technologies, pixel circuits include internal compensation pixel circuits (using internal compensation methods) and external compensation pixel circuits (using external compensation methods). Compared to internal compensation pixel circuits, external compensation pixel circuits contain fewer transistors, which is beneficial for increasing pixel density. However, external compensation pixel circuits require the use of an external detection circuit to detect the threshold voltage of the driving transistors. Furthermore, the detection signal line typically connects multiple pixel circuits. When the threshold voltage of the driving transistor in one pixel circuit connected to the same detection signal line is detected, the gates of the driving transistors in other pixel circuits maintain the detection data voltage, causing the driving transistors to conduct. This results in the display screen jumping from the normally displayed screen to the detection screen during detection, affecting the normal display process and impacting the user experience.

[0065] Figure 1 A schematic diagram of a pixel circuit structure in related technologies, referenced. Figure 1 The pixel circuit includes a data writing module 10, a driving module 20, and a detection module 30. Figure 2 This is a flowchart of a pixel circuit driving method provided in an embodiment of the present invention, see reference. Figure 2 The driving method includes a display stage and a detection stage. The detection stage includes a first detection and writing stage, a current output stage, and a second detection and writing stage. The driving method includes:

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

[0067] Specifically, in the first detection and writing stage, the first scan signal Scan1 is at an on level, which is sufficient to enable the data writing module 10 to conduct, thus writing the detected data voltage to the control terminal G of the drive module 20. In the same stage, the second scan signal Scan2 is also at an on level, which is sufficient to enable the detection module 30 to conduct, thus writing the initial voltage to the first terminal of the drive module 20. The detected data voltage and the initial voltage satisfy the conduction condition of the drive module 20; that is, the drive module 20 conducts when the control terminal G is the detected data voltage and the first terminal is the initial voltage, generating a detection current.

[0068] Step 120: In the current output stage, the drive module generates a detection current based on the detected data voltage and the initial voltage, and the detection module transmits the detection current to the sensing signal line in response to the second scan signal.

[0069] Specifically, during the current output phase, the drive module 20 is turned on based on the detected data voltage and the initial voltage, generating a detection current. During the current output phase, the second scan signal Scan2 is at the on level, causing the detection module 30 to turn on and transmit the detection current to the sensing signal line Sense. The sensing signal line Sense can be connected to an external threshold voltage detection circuit, which determines the threshold voltage of the drive module 20 based on the sensed current on the sensing signal line Sense during the current output phase. In some optional embodiments, a lookup table of the correspondence between sensed current and threshold voltage can be pre-obtained, and the corresponding threshold voltage can be determined from the lookup table based on the sensed current. The drive module 20 may include a drive transistor DT, and the threshold voltage of the drive module 20 is also the threshold voltage of the drive transistor DT. During the current output phase, the first scan signal Scan1 can also remain at the on level, correspondingly turning on the data writing module 10; the first scan signal Scan1 can also switch to the off level, where the off level of the first scan signal Scan1 is the level that turns off the data writing module 10, thus turning off the data writing module 10. Optionally, the pixel circuit also includes a storage module 40. The first end of the storage module 40 can be electrically connected to the control terminal G of the drive module 20, and the second end of the storage module 40 can be electrically connected to the first end of the drive module 20. The storage module 40 can be used to store and maintain the voltage difference between the control terminal G and the first end of the drive module 20.

[0070] Step 130: In the second detection and writing stage, the data writing module writes a set data voltage to the control terminal of the drive module in response to the first scan signal.

[0071] Both the detected data voltage and the set data voltage can be transmitted via the data line. In this embodiment, the detection phase further includes a second detection and writing phase, which occurs after the current output phase. During the second detection and data writing phase, the first scan signal Scan1 is at an on level, the data writing module 10 is turned on, and the set data voltage is written to the control terminal G of the drive module 20. (Reference) Figure 1 The output of the pixel circuit can be connected to the light-emitting device OLED, wherein the first end of the driving module 20 can be used as the output of the pixel circuit.

[0072] In some optional embodiments of the present invention, the data voltage is set to a level that causes the driving module 20 to shut down. This ensures that after the pixel circuit outputs the detected current during the current output phase, the driving module 20 shuts down and no longer generates current, preventing the OLED from lighting up. This allows for threshold voltage detection of the driving module 20 in the screen-off state, thus ensuring that the threshold voltage detection process does not affect the normal display of the screen and improving the user experience. Optionally, the magnitude of the detected data voltage is set such that the OLED does not light up during the current output phase, further guaranteeing that threshold voltage detection of the driving module 20 can be achieved in the screen-off state. Furthermore, in the second detection phase, the data writing module 10 writes a set data voltage to the driving module 20 in response to the first scan signal Scan1. When the set data voltage is sufficient to turn off the driving module 20, the driving module 20 is turned off after each pixel circuit connected to the sensing signal line Sense outputs the detected current to the sensing signal line Sense in the current output phase. This prevents the pixel circuit from continuing to conduct and transmit current to the sensing signal line Sense after outputting the detected current to the sensing signal line Sense in the current output phase, which would lead to inaccurate detection of the current in other pixel circuits connected to the sensing signal line Sense in the current output phase. This improves the detection accuracy of the threshold voltage of the driving module 20, and correspondingly improves the compensation accuracy of the threshold voltage of the driving module 20, thereby enhancing 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. This allows the pixel circuit to output the detected current to the sensing signal line Sense during the current output stage, after which the display stage resumes normal display. This enables the detection of the threshold voltage of the screen-on detection driving module 20, ensuring normal display even after the threshold voltage of the driving module 20 is detected. This reduces the impact of the threshold voltage detection process of the driving module 20 on the normal display of the display panel, improving the user experience.

[0074] Step 140: During the display phase, the data writing module writes display data voltage to the control terminal of the drive module in response to the first scan signal.

[0075] The display stage may include a data writing stage. During the data writing stage, the first scan signal Scan1 is at the on level, which enables the data writing module 10 to conduct and write the display data voltage to the control terminal of the drive module 20. The drive module 20 can display the screen according to the display data voltage, ensuring normal screen display during the display stage.

[0076] The pixel circuit driving method of this embodiment involves the driving module generating a detection current based on the detected data voltage and the initial voltage during the current output phase. The detection module then transmits the detection current to the sensing signal line in response to the second scan signal. During the second detection and writing phase, the data writing module writes a set data voltage to the control terminal of the driving module in response to the first scan signal. The set data voltage is sufficient to turn off the driving module, enabling threshold voltage detection of the driving module in the screen-off state. Therefore, the threshold voltage detection process of the driving module does not affect the normal display of the screen, improving the user experience. Furthermore, setting the data voltage to turn off the driving module prevents the pixel circuit from continuing to conduct and transmit current to the sensing signal line after outputting the detection current during the current output phase, thus improving the accuracy of threshold voltage compensation for the driving module and enhancing the display effect. Alternatively, setting the data voltage to the display data voltage corresponding to the pixel circuit in the display stage allows the pixel circuit to output the detected current to the sensing signal line in the current output stage, and then restore the normal display screen in the display stage. This ensures that the display can still proceed 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 screen of the display panel and improving the user experience.

[0077] Based on the above technical solution, in some optional embodiments of the present invention, when the data voltage is set to be such that the drive module 20 is turned off, the timing of the first scan signal Scan1 and the second scan signal Scan2 are the same.

[0078] During the current output phase, the second scan signal Scan2 is on, and correspondingly, the first scan signal Scan1 is also on, causing the data writing module 10 to be turned on. This allows the detected data voltage to continue being written to the control terminal of the drive module 20, ensuring that the potential at the control terminal of the drive module 20 can be maintained more stably at the detected data voltage during the current output phase. This improves the accuracy of threshold voltage detection for the drive module 20. During the second detection writing phase, the first scan signal Scan1 is on, and correspondingly, the second scan signal Scan2 is also on during the current output phase, causing the detection module 30 to be on. However, because the drive module 20 is off during the second detection writing phase, even if the detection module 30 is on, it will not transmit current like the sensing signal line Sense, ensuring that it does not affect the threshold voltage detection of other pixel circuits connected to the same sensing signal line Sense. 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 the wiring and improving the pixel density of the display panel.

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

[0080] Specifically, in the second detection and writing stage, the second scan signal Scan2 can be at a shutdown level. The shutdown level of the second scan 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, both the detection module 30 and the driving module 20 are turned off. The two modules are turned off in series, which can further prevent leakage current from flowing into the detection signal line in the second detection stage, 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, and further improve the accuracy of threshold voltage compensation and improve the display effect.

[0081] Based on the above embodiments, optionally, the data voltage is set to the display data voltage corresponding to the pixel circuit of the target display stage, and the target display stage is a display stage that is continuous with the detection stage before or after the detection stage; with this setting, the impact of the detection stage on the continuity of the display stage can be minimized, ensuring that the display panel can display the image normally without interrupting the normal display process due to the detection stage.

[0082] Figure 3 This is a schematic diagram of another pixel circuit structure in related technologies, for reference. Figure 3Optionally, the data writing module 10 includes a first transistor T1, the driving module 20 includes a driving transistor DT, the detection 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 can be P-type transistors or N-type transistors; this embodiment does not impose a specific limitation. Figure 3 This schematically illustrates the case where the first transistor T1, the second transistor T2, and the third transistor are all N-type transistors. Correspondingly, the on-level of the first scan signal Scan1 and the second scan signal Scan2 are both high, and the off-level is both low. (Continue to refer to...) 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 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention. Figure 4 The driving timing shown can be used for driving. Figure 3 The pixel circuit shown is for reference. Figure 4 The operation of the pixel circuit in the detection phase includes the first detection and writing phase t1, the current output phase t2, and the second detection and writing phase t3.

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

[0084] During the current output phase t2, the driving transistor DT turns on based on the detected data voltage at the gate and the initial voltage at the source. The absolute value of the difference between the detected data voltage and the initial voltage is greater than the absolute value of the threshold voltage of the driving transistor DT, causing DT to turn on and generate a detection current. During the current output phase, the second scan signal Scan2 is on, and the second transistor T2 turns on, transmitting the detection current 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 based on the sensed current on the sensing signal line Sense during the current output phase. During the current output phase, the first scan signal Scan1 can be either high or low; this embodiment does not impose a specific limitation. Figure 4The diagram illustrates the situation where the first scan signal Scan1 is high. The first transistor T1 turns on in response to the high-level first scan signal Scan1, continuously writing the detected data voltage into the gate of the driving transistor DT, so that the gate of the driving transistor DT can be stabilized at the detected data voltage.

[0085] In the second detection and writing stage t3, the first scan signal Scan1 is high, 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 can be used to turn off the driving transistor DT, or the set data voltage can be the display data voltage of the display stage. This can ensure that the threshold detection process has little impact on the normal display process and improve the user experience.

[0086] This invention also provides a display device. Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of another display device provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of the connection between the pixel circuit and the integrating module. Figure 5 and Figure 6 The display device shown has the pixel circuit connected to the integration module 50 as follows: Figure 7 As shown.

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

[0088] Continue to refer to Figures 5-7 Optionally, the display device further includes multiple first scan lines S1, multiple second scan lines S2, multiple data lines Data, and multiple sensing signal lines Sense; the control terminal 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 terminal of the driving module 20; the control terminal 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] In this design, the first scan line S1 connected to the first row of pixel circuits is denoted as First Scan Line One S11, and the second scan line S2 connected to the first row of pixel circuits is denoted as Second Scan Line One S21. The first scan line S1 connected to the second row of pixel circuits is denoted as First Scan Line Two S12, and the second scan line S2 connected to the second row of pixel circuits is denoted as Second Scan Line Two S22. The first scan line S1 connected to the nth row of pixel circuits is denoted as S1n, and the second scan line S2 connected to the nth row of pixel circuits is denoted as S2n, where n is a positive integer.

[0090] Optionally, when the data voltage is set to be sufficient to turn off the drive module 20, the first scan line S1 is multiplexed as the second scan line S2. That is, the control terminal of the data writing module 10 and the control terminal of the detection module 30 are connected to the same scan line, which can reduce the number of wires in the display panel.

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

[0092] In this embodiment, the sensing signal line Sense is connected to the detection module 30 of a row of pixel circuits. This allows the driving module 20 to be turned off after each pixel circuit connected to the sensing signal line Sense outputs the detected current to the sensing signal line Sense during the current output phase. This prevents the pixel circuit from continuing to conduct after outputting the detected current to the sensing signal line Sense during the current output phase, thus avoiding inaccurate detection of the current in other pixel circuits connected to the sensing signal line Sense during the current output phase. Consequently, the detection accuracy of the threshold voltage of the driving module 20 is improved, and the compensation accuracy of the threshold voltage of the driving module 20 is improved, thereby enhancing the display effect.

[0093] Optionally, the display device further 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 turn on during the first detection and writing phase of each pixel circuit under the control of a first control signal, and to turn off during the current output phase of each pixel circuit.

[0094] refer to Figure 5In some optional embodiments of the present invention, the display device includes a first control switch SW1. The initial voltage input terminal VREF is connected to each sensing signal line Sense through the first control switch SW1. This reduces the number of first control switches SW1 in the display panel. When the first control switch SW1 is located in the display area, the area occupied by the first control switch SW1 in the display area can be reduced, which is beneficial to improving pixel density. When the first control switch SW1 is located in the non-display area, the area occupied by the first control switch SW1 in the non-display area can be reduced, thus reducing the bezel 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 each first control switch SW1 are electrically connected to an initial voltage input terminal Vref, and the second ends of each first control switch SW1 are connected to at least one sensing signal line Sense. By providing 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, thus lowering the current-carrying capacity requirement of the first control switch SW1. In some optional embodiments of the present invention, the display device includes multiple first control switches SW1, with each first control switch SW1 electrically connected to a sensing signal line Sense in a one-to-one correspondence, further reducing the current-carrying capacity requirement of the first control switches SW1. When the display device includes at least two first control switches SW1, the first control signal connected to each first control switch SW1 is the same; that is, each first control switch SW1 is simultaneously turned on and off.

[0096] Specifically, in the first detection and writing stage of each row of pixel circuits, the first control signal is at an on level, causing the first control switch SW1 to be turned on, transmitting the initial voltage input at the initial voltage input terminal Vref to the sensing signal line Sense, and then transmitting the initial voltage to the first terminal of the driving module 20 through the detection module 30 of that row of pixel circuits. In the second detection and writing stage of each row of pixel circuits, the first control signal is at an off level, causing the first control switch SW1 to be turned off, cutting off the connection between the initial voltage input terminal and the first sensing signal line Sense, so that in the second detection and 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] Based on the above technical solutions, optionally, the first control switch SW1 is also used to turn off during the second detection and writing stage of each pixel circuit under the control of the first control signal. Specifically, during the second detection and writing stage of each row of pixel circuits, the first control signal is at the off level, causing the first control switch SW1 to turn off.

[0098] Continue to refer to Figures 5-7Optionally, the display device further includes an integration module 50. The input terminal of the integration module 50 is electrically connected to the sensing signal line Sense, and the output terminal of the integration module 50 is connected to a detection chip. The detection chip is used to determine the threshold voltage of the driving module 20 in the pixel circuit based on the signal output by the integration module 50. In some optional embodiments of the present invention, the integration module 50 may also be integrated into the detection chip. Optionally, the driving chip that outputs data voltage in the display panel may be multiplexed as a detection chip.

[0099] Specifically, the integration module 50 may be included in an external threshold voltage detection circuit. The input terminal of the integration module 50 is connected to at least one sensing signal line Sense. The integration module 50 can integrate the detection current output by the pixel circuit during the current output stage and output a corresponding electrical signal through the output terminal. The electrical signal may 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] Based on the above technical solution, optionally, the integration module 50 includes an operational amplifier U1, an integrating capacitor C0, an initialization switch INTRST, and a sampling switch SMP. The non-inverting input of the operational amplifier U1 is connected to a reference voltage, and the inverting input of the operational amplifier U1 is electrically connected to the input of the integration module 50. The integrating capacitor C0 and the initialization switch INTRST are connected in parallel between the inverting input and output of the operational amplifier U1. The output of the operational amplifier U1 is connected to the output of the integration module 50 via the sampling switch SMP. The initialization switch INTRST is used to turn on before and / or during a set period of the current output phase of the pixel circuit connected to the integration module 50. The set period includes at least a portion of the set time before entering the current output phase, and the set time is less than the total time of the current output phase. The sampling switch SMP is used to turn on during the current output phase of the pixel circuit connected to the integration module 50. The output of the operational amplifier U1, the integrating capacitor C0, the initialization switch INTRST, and the sampling switch SMP are connected to the same node. For example, the set period includes the first 1 / 3 to the first 1 / 2 of the current output phase.

[0101] Specifically, initializing the INTRST switch to conduct before the current output phase, and / or initializing the INTRST switch to conduct during a set period in the current output phase, can initialize the operational amplifier U1, ensuring that the previous integration result does not affect the current integration result, thus improving the accuracy of threshold voltage detection. The sampling switch SMP conducts during the current output phase of the pixel circuit connected to the integration module 50, thereby outputting the integration result of the integration module 50 to the detection chip. This allows the integration module 50 to determine the threshold voltage of the driving module 20 in the pixel circuit based on the integration result.

[0102] Optionally, each integration module 50 is connected to at least two sensing signal lines Sense via a switch module 60. The switch module 60 includes at least two second control switches SW2. Each second control switch SW2 is electrically connected to a sensing signal line Sense via its first terminal, and its second terminal is electrically connected to the input terminal 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 connected different column pixel circuits. The second control signal connected to the different second control switches SW2 is different.

[0103] Specifically, in this embodiment, by setting a switch module 60 including at least two second control switches SW2, different control signals are connected to the control terminals of different control switches in the same switch module 60, so that different control switches SW2 in the same switch module 60 are turned on at different time periods. This allows for the detection of the threshold voltage of the driving module 20 at multiple time periods, specifically detecting the threshold voltage of the driving module 20 connected to one of the second control switches SW2 in the switch module 60. For each pixel circuit, within one detection period, the operation process of the pixel circuit includes a first detection and writing stage, a current output stage, and a second detection and writing stage. This arrangement reduces the number of integrating modules 50 in the display device, saving costs. Furthermore, since the integrating modules 50 are located in the non-display area of ​​the display device, reducing the number of integrating modules 50 saves the total area occupied by each integrating module 50, reducing the bezel width and facilitating the achievement of a narrow bezel.

[0104] Continue to refer to 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 via a switch module 60. The switch module 60 includes three second control switches SW2 (denoted as second control switch one SWR, second control switch two SWG, and second control switch three SWB, respectively). Each second control switch SW2 is connected to a column of pixel circuits via a sensing signal line Sense. One of the three sensing signal lines Sense is connected to the pixel circuit corresponding to a column of red sub-pixels, one is connected to the pixel circuit corresponding to a column of green sub-pixels, and the other is connected to the pixel circuit corresponding to a column of blue sub-pixels. In each switch module 60, the control terminal of the second control switch one SWR connected to the red sub-pixel column is connected to the same control signal, the control terminal of the second control switch two SWG connected to the green sub-pixel column is connected to the same control signal, and the control terminal of the second control switch three SWB connected to the blue sub-pixel column is connected to the same control signal. Different second control switches SW2 in the same switch module 60 are connected to different control signals. This configuration allows the driving modules 20 in the pixel circuits corresponding to the red sub-pixel, the blue sub-pixel, and the green sub-pixel to detect the threshold voltage in different detection cycles, thus avoiding mutual interference between the threshold voltage detection processes of the pixel circuits corresponding to different color sub-pixels. Figure 6 In the display device shown, the data line connecting the pixel circuit corresponding to the red sub-pixel column is denoted as the first data line DataR, the data line connecting the pixel circuit corresponding to the green sub-pixel column is denoted as the second data line DataG, and the data line connecting the pixel circuit corresponding to the blue sub-pixel column is denoted as the third data line DataB.

[0105] This invention also provides a driving method for a display device, which is used to drive the display device of any of the above embodiments of this invention. Figure 8 This is a flowchart of a driving method for a display device provided in an embodiment of the present invention. Figure 9 This is a driving timing diagram of a display device provided in an embodiment of the present invention, wherein, Figure 9 The diagram schematically illustrates the driving timing sequence for two rows of pixel circuits (the first row of pixel circuits and the second row of pixel circuits) in a display panel. This driving timing sequence can be used to drive... Figure 5 The display panel shown is for reference. Figure 8 and Figure 9 The driving method of the display device includes:

[0106] Step 210: Control the multi-row pixel circuit to enter the detection stage sequentially.

[0107] The detection phase t0 includes a first detection and writing phase t1, a current output phase t2, and a second detection and writing phase t3, performed sequentially. As described in the above embodiment, when performing threshold voltage detection on the driving module of the pixel circuit in the display device, it can be either screen-off detection or screen-on detection. In the case of screen-off detection, a program can be pre-set in the detection chip of the display device. Optionally, screen-off detection can be triggered when the time elapsed since the last detection phase is greater than or equal to a preset time, and the display device is detected to be in a screen-off state. In the case of screen-on detection, corresponding trigger conditions can also be set in the detection chip, and screen-on detection can be performed after the trigger conditions are met. Regardless of whether it is screen-off or screen-on detection, it is necessary to control multiple rows of pixel circuits to enter the detection phase sequentially, for example, controlling the pixel circuits to enter the detection phase row by row. (Reference) Figure 9 The detection phase can proceed to the detection phase of the next row of pixels after the detection phase of one row of pixels is completed. Here, t01 is the detection phase of the first row of pixels, and t02 is the detection phase of the second row of pixels.

[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 scan signal with a conduction level is provided to the first scan line connected to the pixel circuit, controlling the data writing module to write the detection data voltage to the control terminal of the driving module; and an initial voltage is provided to the sensing signal line connected to the pixel circuit, and a second scan signal with a conduction level is provided to the second scan line connected to the pixel circuit, controlling the detection module to write the initial voltage to the first terminal of the driving module.

[0109] For example, in the first detection and 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 scan signal with a conduction level is provided to the first scan line (first scan line - S11) connected to the row of pixel circuits, controlling the data writing module to write the detection data voltage to the control terminal of the driving module; a second scan signal with a conduction level is provided to the second scan line (second scan line - S21) connected to the row of pixel circuits, causing the detection module to conduct and write the initial voltage to the first terminal of the driving module. The first detection and writing stage of the second row of pixel circuits is similar and will not be described again here.

[0110] Combination Figure 5 Optionally, in step 220 above, providing an initial voltage to the sensing signal line connected to the pixel circuit during the first detection and writing stage of the pixel circuit includes: providing a first control signal with a conduction level to the first control switch during the first detection and writing stage of the pixel circuit, so as to turn on the first control switch and transmit the initial voltage to the sensing signal line to initialize the first terminal of the driving module and the integration module. Figure 9The driving timing shown corresponds to the case where the first control switch includes an N-type transistor and the first control signal is at a high level.

[0111] Step 230: During the current output stage of the pixel circuit, the initial voltage supplied to the sensing signal line connected to the pixel circuit is turned off, and a second scan signal with a conduction level is provided to the second scan line connected to the pixel circuit, so as to control the detection module to transmit the detection current output by the drive module to the corresponding connected sensing signal line.

[0112] For example, during the current output phase of the first row of pixel circuits, a second scan signal with a conduction level is provided to the second scan line (second scan line - S21) connected to that row of pixel circuits, causing the detection module to conduct and transmit the detection current output by the drive module to the corresponding connected sensing signal line. The same applies to the current output phase of the second row of pixel circuits, and will not be described again here.

[0113] Combination Figure 5 Optionally, in step 230 above, during the current output phase of the pixel circuit, turning off the initial voltage supplied to the sensing signal line connected to the pixel circuit includes: during the current output phase of the pixel circuit, providing a first control signal with a turn-off level to the first control switch to turn off the first control switch, thereby turning off the initial voltage supplied to the sensing signal line connected to the pixel circuit. Optionally, the driving method of the display device further includes: during the current output phase of the pixel circuit, selecting one of the second control switches of the switching module to transmit the detected current to the input terminal of the integration module through the sensing signal line, and at least at the end of the current output phase of the pixel circuit, controlling the sampling switch SMP in the integration module to be turned on, transmitting the output signal of the integration module to the detection chip. Figure 9 The driving timing shown corresponds to the case where the second control switch includes an N-type transistor and the second control signal is at a high level. In some optional embodiments, the final time period includes the latter half of the current output phase. In another optional embodiment, the final time period includes the last 1 / n segment of the current output phase, where n is greater than 2; for example, n = 3, 4, 5, 8, 10, or 15.

[0114] Step 240: In the second detection and writing stage of the pixel circuit, a set data voltage is provided to the data line connected to the pixel circuit, and a first scan signal with a conduction level is provided to the first scan line connected to the pixel circuit to control the data writing module to write the set data voltage to the driving module.

[0115] For example, in the second detection and writing stage of the first row pixel circuit, a first scan signal with a conduction level is provided to the first scan line (first scan line - S11) connected to the row pixel circuit, causing the data writing module to conduct and write the set data voltage to the control terminal of the drive module. The same applies to the second detection and writing stage of the second row pixel circuit, and will not be described again here.

[0116] Among them, the data voltage is set to the condition that the drive module is turned off, or the data voltage is set to the data voltage corresponding to the pixel circuit in the display stage.

[0117] The driving method of the display device in 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 again here.

[0118] Figure 10 This is a driving timing diagram of another display device provided in an embodiment of the present invention. This driving timing can be used to drive... Figure 6 The display panel shown illustrates, in this driving timing diagram, the threshold voltage detection of the driving module in the pixel circuit corresponding to the red sub-pixel in the display panel, and also schematically shows the driving timing for the first two rows of pixel circuits. (Reference) Figure 6 and Figure 10 ,and Figure 9 The driving timing shown is different, Figure 10 In the driving timing shown, when performing threshold voltage detection on the driving module in the pixel circuit corresponding to the red sub-pixel, in the first detection and write phase, only the detection data voltage can be provided to the first data line DataR connected to the pixel circuit corresponding to the red sub-pixel. In the second detection and write phase, only the set data voltage can be provided to the first data line DataR connected to the pixel circuit corresponding to the red sub-pixel. This is achieved by controlling the second control switch SWR connected to the red sub-pixel column to be turned on (providing a low level to the second control switch SWR), and the second control switch SWG connected to the green sub-pixel column to be turned off (providing a low level to the second control switch SWG) and the second control switch SWB connected to the blue sub-pixel column to be turned off. Figure 10 The driving timing shown corresponds to the second control switch, which includes a P-type transistor. The on level of the second control switch is low, and the off level is high.

[0119] Continue to refer to 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 circuitry. Figure 5 The diagram illustrates a display device comprising two display areas, namely a first display area AA1 and a second display area AA2.

[0120] In the above embodiment, step 210 controls the multi-row pixel circuits to enter the detection stage sequentially, including: controlling each row of pixel circuits in the set display area to enter the detection stage sequentially.

[0121] Specifically, the display area is defined as one of at least one display area. In this embodiment, the pixel circuits of different display areas of the display device can be controlled to detect threshold voltages in different time periods. This avoids the situation where the threshold voltage of the driving module in each pixel circuit of the display device cannot be accurately detected due to the detection phase being too short, thus 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 configuration enables screen-on detection of the threshold voltage of the driving module in the pixel circuit and ensures good continuity of the displayed image.

[0123] Optionally, the driving method for the display device further includes: in each display stage, sequentially providing a first scan signal with a conduction level to each first scan 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 phase is located in the inter-frame blanking region. Specifically, the display phase may include multiple display frames, and within each display frame, data voltages may be written to the pixel circuits line by line. The inter-frame blanking region is the time interval between the writing of data voltages to the last row of pixel circuits in the display panel of the preceding display frame and the writing of data voltages to the first row of pixel circuits in the display panel of the following display frame. Therefore, the duration of the inter-frame blanking region is usually short. By controlling each row of pixel circuits in the designated display area to enter the detection phase sequentially when the detection phase is located in the inter-frame blanking region, the situation where the detection phase duration is too short, resulting in the inability to accurately detect the threshold voltages of the driving modules in each pixel circuit of the display device, can be avoided, thus ensuring the accuracy of detecting the threshold voltages of the driving modules of the pixel circuits in the designated display area.

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

[0126] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A driving method for 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, the detection stage including a first detection writing stage, a current output stage, and a second detection writing stage; the driving method includes: In the first detection and writing phase, the data writing module writes a detection data voltage to the control terminal of the driving module in response to the first scan signal, and the detection module writes an initial voltage to the first terminal of the driving module in response to the second scan signal. During the current output phase, the driving module generates a detection current based on the detected data voltage and the initial voltage, and the detection module transmits the detection current to the sensing signal line in response to the second scan signal. During the second detection and writing phase, the data writing module responds to the first scanning signal by writing a set data voltage to the control terminal of the driving module; Wherein, the set data voltage satisfies the condition of turning off the driving module, or the set data voltage is the display data voltage corresponding to the pixel circuit in the display stage; The driving method further includes: During the second detection and writing phase, the detection module shuts down in response to the second scan signal.

2. The driving method for the pixel circuit according to claim 1, characterized in that, The set data voltage is sufficient to shut down the drive module; the timing of the first scan signal and the second scan signal is the same.

3. The driving method for 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 the target display stage, and the target display stage is the display stage that is consecutive to the detection stage before or after the detection stage.

4. The driving method for the pixel circuit according to claim 1, characterized in that, Also includes: During the display phase, the data writing module writes the display data voltage to the control terminal of the driving module in response to the first scan signal.

5. The driving method for the pixel circuit according to claim 4, characterized in that, The pixel circuit further includes a storage module, a first end of which is electrically connected to the control end of the driving module, and a second end of which is electrically connected to the first end of the driving module. 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, It includes multiple pixel circuits, which are driven by the pixel circuit driving method according to any one of claims 1-5.

7. The display device according to claim 6, characterized in that, The display device also includes multiple first scan lines, multiple second scan lines, multiple data lines, and multiple sensing signal lines; The control terminal of the data writing module is electrically connected to the first scan line, the first terminal of the data writing module is electrically connected to the data line, and the second terminal of the data writing module is electrically connected to the control terminal of the drive module. The control terminal of the detection module is electrically connected to the second scan line, the first terminal of the detection module is electrically connected to the sensing signal line, and the second terminal of the detection module is electrically connected to the first terminal of the driving module.

8. The display device according to claim 7, characterized in that, The set data voltage is sufficient to shut down the drive module; the first scan line is multiplexed as the second scan line.

9. The display device according to claim 8, characterized in that, Each of the first scan lines is connected to at least one row of the data writing modules of the pixel circuit, and each of the second scan lines is connected to at least one row of the detection modules of the pixel circuit; each of the data lines is connected to at least one column of the data writing modules of the pixel circuit, and each of the sensing signal lines is connected to one column of the detection modules of the pixel circuit.

10. The display device according to claim 9, characterized in that, 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 of the sensing signal lines through the first control switch; the first control switch is used to turn on during the first detection and writing phase of each pixel circuit and turn off during the current output phase of each pixel circuit under the control of a first control signal.

11. The display device according to claim 10, characterized in that, The first control switch is also used to turn off during the second detection and writing phase of each pixel circuit under the control of the first control signal.

12. The display device according to claim 11, characterized in that, The display device includes a plurality of the first control switches, and the first control switches are electrically connected to the sensing signal lines one by one.

13. The display device according to claim 12, characterized in that, The display device further includes an integration module, the input terminal of which is electrically connected to at least one of the sensing signal lines, and the output terminal of which is connected to a detection chip. The detection chip is used to determine the threshold voltage of the driving module in the pixel circuit based on the signal output by the integration module. The integration module includes an operational amplifier, an integrating capacitor, an initialization switch, and a sampling switch. The non-inverting input of the operational amplifier is connected to a reference voltage, and the inverting input of the operational amplifier is electrically connected to the input of the integration module. The integrating capacitor and the initialization switch are connected in parallel between the inverting input and output of the operational amplifier. The output of the operational amplifier is connected to the output of the integration module via the sampling switch. The initialization switch is used to turn on before and / or during a set period of the current output phase of the pixel circuit connected to the integration module. The set period includes at least a portion of the set time within the current output phase, and the set time is less than the total time of the current output phase. The sampling switch is used to turn on during the current output phase of the pixel circuit connected to the integration module. The output of the operational amplifier, the integrating capacitor, the initialization switch, and the sampling switch are connected to the same node.

14. The display device according to claim 13, characterized in that, Each integration module is connected to at least two sensing signal lines via a switch module. The switch module includes at least two second control switches. Each second control switch is electrically connected to a sensing signal line via its first terminal, and its second terminal is electrically connected to the input terminal 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 pixel circuits in different columns connected to it. The second control signals connected to the different second control switches are different.

15. A driving method for a display device, characterized in that, include: The control circuits of multiple rows of pixels sequentially enter the detection phase; 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 scan signal with a conduction level is provided to the first scan line connected to the pixel circuit, controlling the data writing module to write the detection data voltage to the control terminal of the driving module; and an initial voltage is provided to the sensing signal line connected to the pixel circuit, and a second scan signal with a conduction level is provided to the second scan line connected to the pixel circuit, controlling the detection module to write the initial voltage to the first terminal of the driving module. During the current output phase of the pixel circuit, the initial voltage supplied to the sensing signal line connected to the pixel circuit is turned off, and a second scanning signal with a conduction level is provided to the second scanning line connected to the pixel circuit, thereby controlling the detection module to transmit the detection current output by the driving module to the corresponding connected sensing signal line. In the second detection and writing stage of the pixel circuit, a set data voltage is provided to the data line connected to the pixel circuit, and a first scan signal with a conduction level is provided to the first scan line connected to the pixel circuit to control the data writing module to write the set data voltage to the driving module; Wherein, the set data voltage satisfies the condition of turning off the driving module, or the set data voltage is the data voltage corresponding to the pixel circuit in the display stage; The driving method further includes: During the second detection and writing phase, the detection module shuts down in response to the second scan signal.

16. The driving method for the display device according to claim 15, characterized in that, The display device includes at least one display area, the display area including at least one row of pixel circuits, and the control of multiple rows of pixel circuits to sequentially enter the detection phase includes: The control sets each row of pixel circuits in the display area to sequentially enter the detection phase; the set display area is one of at least one of the display areas.

17. The driving method for a display device according to claim 16, characterized in that, The detection phase is located between two adjacent display phases; The driving method for the display device further includes: In each display stage, a first scan signal with a conduction level is sequentially provided to each of the first scan 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 display data voltage, and the driving module generates a driving current according to the display data voltage.

18. The driving method for a display device according to claim 17, characterized in that, The detection phase is located in the inter-frame blanking region.

19. The driving method for a display device according to claim 18, characterized in that, The display device includes at least two display areas.

20. The driving method for the display device according to claim 19, characterized in that, The pixel circuits in each row of the control setting display area sequentially enter the detection phase, including: Between different display stages, the pixel circuits in each row of different display areas are controlled to sequentially enter the detection stage.

21. The driving method for the display device according to any one of claims 16-20, characterized in that, The provision of an initial voltage to the sensing signal line connected to the pixel circuit during the first detection and writing phase of the pixel circuit includes: During the first detection and writing phase of the pixel circuit, a first control signal with a conduction level is provided to the first control switch to turn on the first control switch and transmit the initial voltage to the sensing signal line to initialize the first terminal of the driving module and the integration module. During the current output phase of the pixel circuit, turning off the initial voltage supplied to the sensing signal line connected to the pixel circuit includes: During the current output phase of the pixel circuit, a first control signal with a shutdown level is provided to the first control switch to turn off the first control switch and shut off the initial voltage supplied to the sensing signal line connected to the pixel circuit. The driving method further includes: During the current output phase of the pixel circuit, one of the second control switches of the switching module is turned on so that the detected current is transmitted to the input terminal of the integration module through the sensing signal line. At least at the end of the current output phase of the pixel circuit, the sampling switch in the integration module is turned on to transmit the output signal of the integration module to the detection chip.

22. The driving method for the display device according to claim 21, characterized in that, The final period includes the latter half of the current output phase.

Images