Pixel circuit and driving method thereof, display panel and display device

Abstract

The embodiment of the invention discloses a pixel circuit and a driving method thereof, a display panel and a display device.The pixel circuit comprises a driving module, a voltage control module and a light-emitting module, the driving module and the voltage control module are connected between a first power line and the first end of the light-emitting module, and the second end of the light-emitting module is connected with a second power line; the driving module is used for driving the light-emitting module to emit light. The voltage control module is used for controlling the voltage of one end of the driving module connected with the voltage control module when the display gray scale is smaller than the preset gray scale. According to the technical scheme provided by the embodiment, the display brightness under the low gray scale can be improved, and the display effect can be improved.

Description

Technical Field

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

[0002] With the continuous development of display technology, people's requirements for display quality are getting higher and higher.

[0003] Currently, the display panel in the related art has the problem of poor display effect. Summary of the invention

[0004] Embodiments of the present invention provide a pixel circuit and a driving method thereof, a display panel and a display device to improve display effects.

[0005] According to one aspect of the present invention, there is provided a pixel circuit, comprising: a driving module, a voltage control module and a light emitting module;

[0006] The driving module and the voltage control module are connected between the first power line and the first end of the light-emitting module, the second end of the light-emitting module is connected to the second power line, the driving module is used to drive the light-emitting module to emit light, and the voltage control module is used to control the voltage at one end connected between the driving module and the voltage control module when the displayed grayscale is less than the preset grayscale.

[0007] Optionally, when the displayed grayscale is less than a preset grayscale, the transistor included in the voltage control module is in a subthreshold region;

[0008] Optionally, the preset grayscale is 32 grayscales;

[0009] Optionally, the preset grayscale is 16 grayscales;

[0010] Optionally, when a black picture is displayed, the transistor included in the voltage control module is in a cut-off region;

[0011] Optionally, the display grayscale corresponding to displaying a black image is 0 grayscale.

[0012] Optionally, when the displayed gray scale is greater than or equal to a preset gray scale, the transistor included in the voltage control module is in a linear region or a saturation region.

[0013] Optionally, the control end of the voltage control module is connected to a first voltage signal line, and the first voltage signal line is used to transmit a first voltage;

[0014] When the displayed grayscale is less than the preset grayscale, the absolute value of the difference between the first voltage and the voltage of one end of the driving module is less than the absolute value of the threshold voltage of the voltage control module, and the one end of the driving module is the end connected to the voltage control module;

[0015] When the displayed grayscale is greater than or equal to the preset grayscale, the absolute value of the difference between the first voltage and the voltage of one end of the driving module is greater than or equal to the absolute value of the threshold voltage of the voltage control module, and the one end of the driving module is the end connected to the voltage control module;

[0016] Optionally, the first voltage is a DC voltage.

[0017] Optionally, the pixel circuit further includes a first light emitting control module and a second light emitting control module, wherein the control end of the first light emitting control module is connected to the first light emitting control signal line, and the control end of the second light emitting control module is connected to the second light emitting control signal line;

[0018] A first end of the first light-emitting control module is connected to the first power line, a second end of the first light-emitting control module is connected to the first end of the driving module, a second end of the driving module is connected to the first end of the voltage control module, a second end of the voltage control module is connected to the first end of the second light-emitting control module, and a second end of the second light-emitting control module is connected to the first end of the light-emitting module;

[0019] Alternatively, a first end of the first light-emitting control module is connected to a first power line, a second end of the first light-emitting control module is connected to a first end of the driving module, a second end of the driving module is connected to a first end of the second light-emitting control module, a second end of the second light-emitting control module is connected to a first end of the voltage control module, and a second end of the voltage control module is connected to a first end of the light-emitting module;

[0020] Optionally, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the second transistor as the second end of the driving module, the second electrode of the second transistor is connected to the first electrode of the fourth transistor, the second electrode of the fourth transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, the gate of the second transistor is connected to the first voltage signal line, and the gate of the fourth transistor is connected to the second light-emitting control signal line;

[0021] Alternatively, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the fourth transistor as the second end of the driving module, the second electrode of the fourth transistor is connected to the first electrode of the second transistor, the second electrode of the second transistor is connected to the first electrode of the light-emitting diode, and the second electrode of the light-emitting diode is connected to the second power line;

[0022] Optionally, the first transistor is a P-type transistor or an N-type transistor, and the second transistor is a P-type transistor;

[0023] Optionally, when the first transistor is a P-type transistor, the first light-emitting control signal line is multiplexed into the second light-emitting control signal line.

[0024] Optionally, the pixel circuit further includes a first light emitting control module and a second light emitting control module, wherein the control end of the first light emitting control module is connected to the first light emitting control signal line, and the control end of the second light emitting control module is connected to the second light emitting control signal line;

[0025] A first end of the first light control module is connected to the first power line, a second end of the first light control module is connected to the first end of the voltage control module, a second end of the voltage control module is connected to the first end of the driving module, a second end of the driving module is connected to the first end of the second light control module, and a second end of the second light control module is connected to the first end of the light module;

[0026] Alternatively, a first end of the voltage control module is connected to a first power line, a second end of the voltage control module is connected to a first end of a first light control module, a second end of the first light control module is connected to a first end of a driving module, a second end of the driving module is connected to a first end of a second light control module, and a second end of the second light control module is connected to a first end of the light module;

[0027] Optionally, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the second electrode of the third transistor is connected to the first electrode of the second transistor, the first electrode of the first transistor is connected to the second electrode of the second transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the fourth transistor as the second end of the driving module, the second electrode of the fourth transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, the gate of the second transistor is connected to the first voltage signal line, and the gate of the fourth transistor is connected to the second light-emitting control signal line;

[0028] Alternatively, the first electrode of the second transistor is connected to the first power line, the second electrode of the second transistor is connected to the first electrode of the third transistor, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the fourth transistor as the second end of the driving module, the second electrode of the fourth transistor is connected to the first electrode of the light-emitting diode, and the second electrode of the light-emitting diode is connected to the second power line;

[0029] Optionally, the first transistor is an N-type transistor, and the second transistor is an N-type transistor;

[0030] Optionally, the first control end of the voltage control module is connected to the second light-emitting control signal line, and the second control end of the voltage control module is connected to the control end of the driving module;

[0031] Optionally, the pixel circuit further includes a first light-emitting control module, a control end of the first light-emitting control module is connected to a first light-emitting control signal line, a first end of the first light-emitting control module is connected to a first power line, a second end of the first light-emitting control module is connected to a first end of the driving module, a second end of the driving module is connected to a first end of the voltage control module, and a second end of the voltage control module is connected to a first end of the light-emitting module;

[0032] Optionally, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the second transistor as the second end of the driving module, the second electrode of the second transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, the first gate of the second transistor is connected to the second light-emitting control signal line, and the second gate of the second transistor is connected to the gate of the first transistor;

[0033] Optionally, the first gate of the second transistor is a top gate, and the second gate of the second transistor is a bottom gate;

[0034] Optionally, the channel type of the first transistor is the same as the channel type of the second transistor;

[0035] Optionally, the first transistor and the second transistor are both P-type transistors;

[0036] Optionally, the first light-emitting control signal line is multiplexed into a second light-emitting control signal line.

[0037] Optionally, the first control end of the voltage control module is connected to the second light-emitting control signal line, and the second control end of the voltage control module is connected to the control end of the driving module;

[0038] Optionally, the pixel circuit further includes a first light-emitting control module, a control end of the first light-emitting control module is connected to a first light-emitting control signal line, a first end of the voltage control module is connected to a first power line, a second end of the voltage control module is connected to a first end of the driving module, a second end of the driving module is connected to a first end of the first light-emitting control module, and a second end of the first light-emitting control module is connected to a first end of the light-emitting module;

[0039] Optionally, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the light-emitting module includes a light-emitting diode, the first gate of the second transistor is connected to the second light-emitting control signal line, the second gate of the second transistor is connected to the gate of the first transistor, the first electrode of the second transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the second transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the third transistor as the second end of the driving module, the second electrode of the third transistor is connected to the first electrode of the light-emitting diode, and the second electrode of the light-emitting diode is connected to the second power line;

[0040] Optionally, the first gate of the second transistor is a top gate, and the second gate of the second transistor is a bottom gate;

[0041] Optionally, the channel type of the first transistor is the same as the channel type of the second transistor;

[0042] Optionally, the first transistor and the second transistor are both N-type transistors;

[0043] Optionally, the first light-emitting control signal line is multiplexed into a second light-emitting control signal line.

[0044] Optionally, the first transistor is a P-type transistor, and the pixel circuit further comprises a first initialization module, wherein a control end of the first initialization module is connected to a first scanning signal line, a first end of the first initialization module is connected to a second voltage signal line, and a second end of the first initialization module is connected to a first end of the light-emitting module;

[0045] Optionally, the first initialization module includes a fifth transistor, a gate of the fifth transistor is connected to the first scanning signal line, a first electrode of the fifth transistor is connected to the second voltage signal line, and a second electrode of the fifth transistor is connected to the first electrode of the light emitting diode;

[0046] Optionally, the pixel circuit further includes a data writing module, a control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the first end of the driving module, and the data writing module is used to write the data voltage to the control end of the driving module;

[0047] Optionally, the pixel circuit further includes a compensation module, a control end of the compensation module is connected to the second scanning signal line, the compensation module is connected between the second end and the control end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module;

[0048] Optionally, the pixel circuit further includes a storage module, and the storage module is connected between the control end of the driving module and the first power line;

[0049] Optionally, the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor and the gate of the seventh transistor are both connected to the second scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the first end of the driving module, the first electrode of the seventh transistor is connected to the second end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first power line and the control end of the driving module;

[0050] Optionally, the pixel circuit further includes a second initialization module, a control end of the second initialization module is connected to the third scanning signal line, a first end of the second initialization module is connected to the third voltage signal line, and a second end of the second initialization module is connected to the control end of the driving module;

[0051] Optionally, the second initialization module includes an eighth transistor, a gate of the eighth transistor is connected to the third scan signal line, a first electrode of the eighth transistor is connected to the third voltage signal line, and a second electrode of the eighth transistor is connected to the control end of the driving module;

[0052] Optionally, the second scan signal line or the third scan signal line is multiplexed as the first scan signal line.

[0053] Optionally, the first transistor is an N-type transistor, and the pixel circuit further comprises a first initialization module, wherein a control end of the first initialization module is connected to a first scanning signal line, a first end of the first initialization module is connected to a second voltage signal line, and a second end of the first initialization module is connected to a first end of the light emitting module;

[0054] Optionally, the first initialization module includes a fifth transistor, a gate of the fifth transistor is connected to the first scanning signal line, a first electrode of the fifth transistor is connected to the second voltage signal line, and a second electrode of the fifth transistor is connected to the first electrode of the light emitting diode;

[0055] Optionally, the pixel circuit further comprises a data writing module, a control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the second end of the driving module, and the data writing module is used to write the data voltage to the control end of the driving module;

[0056] Optionally, the pixel circuit further includes a compensation module, a control end of the compensation module is connected to the first scanning signal line, the compensation module is connected between the first end and the control end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module;

[0057] Optionally, the pixel circuit further includes a storage module, and the storage module is connected between the control end of the driving module and the first end of the light emitting module;

[0058] Optionally, the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor is connected to the second scanning signal line, the gate of the seventh transistor is connected to the first scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the second end of the driving module, the first electrode of the seventh transistor is connected to the first end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first end of the light-emitting module and the control end of the driving module.

[0059] Optionally, the voltage control module includes a first sub-control module and a second sub-control module, the control end of the first sub-control module is connected to the first light-emitting control signal line, the control end of the second sub-control module is connected to the second light-emitting control signal line, the first end of the first sub-control module is connected to the first power line, the second end of the first sub-control module is connected to the first end of the driving module, the second end of the driving module is connected to the first end of the second sub-control module, and the second end of the second sub-control module is connected to the first end of the light-emitting module;

[0060] Wherein, when the displayed gray scale is less than the preset gray scale, the transistors included in the first sub-control module and / or the second sub-control module are in the sub-threshold region;

[0061] Optionally, the driving module includes a first transistor, the first sub-control module includes a ninth transistor, the second sub-control module includes a tenth transistor, the light-emitting module includes a light-emitting diode, the gate of the ninth transistor is connected to the first light-emitting control signal line, the first electrode of the ninth transistor is connected to the first power line, the second electrode of the ninth transistor is connected to the first electrode of the first transistor, the second electrode of the first transistor is connected to the first electrode of the tenth transistor, the second electrode of the tenth transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, and the gate of the tenth transistor is connected to the second light-emitting control signal line.

[0062] Optionally, the pixel circuit further comprises a first initialization module, a control end of the first initialization module is connected to the first scanning signal line, a first end of the first initialization module is connected to the second voltage signal line, and a second end of the first initialization module is connected to the first end of the light emitting module;

[0063] Optionally, the first initialization module includes a fifth transistor, a gate of the fifth transistor is connected to the first scanning signal line, a first electrode of the fifth transistor is connected to the second voltage signal line, and a second electrode of the fifth transistor is connected to the first electrode of the light emitting diode;

[0064] Optionally, an absolute value of an effective level of a first light emitting control signal transmitted on the first light emitting control signal line is smaller than an absolute value of an effective level of a first scanning signal transmitted on the first scanning signal line; and / or,

[0065] An absolute value of an effective level of a second light emitting control signal transmitted on the second light emitting control signal line is smaller than an absolute value of an effective level of a first scanning signal transmitted on the first scanning signal line;

[0066] Optionally, the ninth transistor and the tenth transistor have the same channel type;

[0067] Optionally, the first light-emitting control signal line is multiplexed into a second light-emitting control signal line.

[0068] Optionally, the pixel circuit further includes a data writing module, a control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the driving module, and the data writing module is used to write the data voltage to the control end of the driving module;

[0069] The pixel circuit further includes a data writing module, a control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the driving module, and the data writing module is used to write the data voltage to the control end of the driving module;

[0070] The pixel circuit further includes a compensation module, wherein the control end of the compensation module is connected to the second scanning signal line, and the compensation module is connected between the second end and the control end of the driving module, or the control end of the compensation module is connected to the first scanning signal line, and the compensation module is connected between the first end and the control end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module;

[0071] Optionally, the pixel circuit further includes a storage module, and the storage module is connected to the control end of the driving module;

[0072] Optionally, the first transistor is a P-type transistor; the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor and the gate of the seventh transistor are both connected to the second scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the first end of the driving module, the first electrode of the seventh transistor is connected to the second end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first power line and the control end of the driving module;

[0073] Optionally, the pixel circuit further includes a second initialization module, a control end of the second initialization module is connected to the third scanning signal line, a first end of the second initialization module is connected to the third voltage signal line, and a second end of the second initialization module is connected to the control end of the driving module;

[0074] Optionally, the second initialization module includes an eighth transistor, a gate of the eighth transistor is connected to the third scan signal line, a first electrode of the eighth transistor is connected to the third voltage signal line, and a second electrode of the eighth transistor is connected to the control end of the driving module;

[0075] Optionally, the third scan signal line is multiplexed as the first scan signal line.

[0076] Optionally, the first transistor is an N-type transistor; the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor is connected to the second scanning signal line, the gate of the seventh transistor is connected to the first scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the second end of the driving module, the first electrode of the seventh transistor is connected to the first end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first end of the light-emitting module and the control end of the driving module.

[0077] According to another aspect of the present invention, a driving method of a pixel circuit is provided. The pixel circuit includes a driving module, a voltage control module and a light emitting module. The driving method of the pixel circuit includes:

[0078] In the light-emitting stage, the driving module is controlled to drive the light-emitting module to emit light; wherein, when the displayed grayscale is less than the preset grayscale, the voltage control module is controlled to control the voltage at one end connecting the driving module and the voltage control module.

[0079] Optionally, the voltage control module includes a transistor, and controlling the voltage control module to control the voltage at one end connected between the driving module and the voltage control module includes:

[0080] Controlling the transistor in the voltage control module to be in a subthreshold region in response to a signal at a control terminal of the voltage control module;

[0081] Preferably, the step of controlling the voltage control module to control the voltage at one end of the driving module connected to the voltage control module comprises:

[0082] When the displayed grayscale is greater than grayscale 0 and less than the preset grayscale, controlling the transistor in the voltage control module to respond to the signal at the control end of the voltage control module in a subthreshold region;

[0083] When the display gray scale is gray scale 0, controlling the transistor in the voltage control module to be in a cut-off region in response to the signal at the control end of the voltage control module;

[0084] Optionally, the driving method of the pixel circuit further includes:

[0085] In the non-light-emitting stage, the transistor in the control voltage control module is in the cut-off region in response to the signal at the control end of the voltage control module.

[0086] According to another aspect of the present invention, there is provided a display panel, the display panel comprising:

[0087] substrate;

[0088] An active layer, located on one side of the substrate;

[0089] A plurality of conductive layers stacked on a side of the active layer away from the substrate;

[0090] At least one pixel circuit, the pixel circuit includes a driving module, a voltage control module and a light emitting module, wherein the driving module includes a first transistor, the voltage control module includes a second transistor, and the light emitting module includes a light emitting diode;

[0091] The multilayer conductive layer includes a first conductive layer, the gate of the first transistor and the gate of the second transistor are both located in the first conductive layer, and the orthographic projection of the gate of the second transistor on the substrate is located between the orthographic projection of the gate of the first transistor on the substrate and the orthographic projection of the first electrode of the light-emitting diode on the substrate.

[0092] Optionally, the active layer includes a first active layer, the channel region of the first transistor is located in the first active layer, and the orthographic projection of the gate of the first transistor on the substrate at least partially covers the orthographic projection of the channel region of the first transistor on the substrate;

[0093] Optionally, the pixel circuit further includes a first light-emitting control module and a second light-emitting control module, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the active layer further includes a second active layer and a third active layer, the channel region of the third transistor is located in the second active layer, the channel region of the fourth transistor is located in the third active layer, the orthographic projection of the gate of the third transistor on the substrate at least partially covers the orthographic projection of the channel region of the third transistor on the substrate, and the orthographic projection of the gate of the fourth transistor on the substrate at least partially covers the orthographic projection of the channel region of the fourth transistor on the substrate;

[0094] Optionally, the first active layer, the second active layer and the third active layer are in the same layer and connected;

[0095] Optionally, the second active layer extends along the second direction, the third active layer extends along the second direction, and the second active layer and the third active layer are located on different sides of the first active layer;

[0096] Optionally, the orthographic projection of the gate of the second transistor on the substrate is located on a side of the orthographic projection of the gate of the fourth transistor on the substrate away from the orthographic projection of the gate of the first transistor on the substrate.

[0097] The display panel further includes a first voltage signal line, the first voltage signal line is located in the first conductive layer, and an orthographic projection of the first voltage signal line on the substrate at least partially covers an orthographic projection of a channel region of the second transistor on the substrate;

[0098] Optionally, the channel region of the second transistor is located in the third active layer;

[0099] Optionally, an orthographic projection of the first voltage signal line on the substrate does not overlap with an orthographic projection of the second active layer on the substrate;

[0100] Optionally, the first voltage signal line extends along a first direction, and the first direction intersects with the second direction.

[0101] Optionally, the display panel further includes a first light emitting control signal line, and the first light emitting control signal line is arranged to cross the second active layer and the third active layer;

[0102] Optionally, the orthographic projection of the first light-emitting control signal line on the substrate is located between the orthographic projection of the first voltage signal line on the substrate and the orthographic projection of the gate of the first transistor on the substrate;

[0103] Optionally, the first light emitting control signal line extends along a first direction;

[0104] Optionally, the pixel circuit further includes a first initialization module, the first initialization module includes a fifth transistor, a channel region of the fifth transistor is located in the third active layer, and the display panel further includes a first scanning signal line, an orthographic projection of the first scanning signal line on the substrate at least partially covers an orthographic projection of the channel region of the fifth transistor on the substrate;

[0105] Optionally, the display panel further includes a second voltage signal line and a connecting line, the multi-layer conductive layer further includes a second conductive layer and a third conductive layer, the second voltage signal line is located in the second conductive layer, the connecting line is located in the third conductive layer, the second voltage signal line is connected to one end of the connecting line through a via hole, and the third active layer is connected to the other end of the connecting line through a via hole;

[0106] Optionally, the second voltage signal line extends along the first direction, and the connecting line extends along the second direction;

[0107] Optionally, the orthographic projection of the first scan signal line on the substrate is located between the orthographic projection of the first voltage signal line on the substrate and the orthographic projection of the second voltage signal line on the substrate, and the orthographic projection of the first scan signal line on the substrate is located on a side of the orthographic projection of the first voltage signal line on the substrate away from the orthographic projection of the gate of the first transistor on the substrate.

[0108] According to another aspect of the present invention, a display device is provided. The display device includes the display panel provided by any embodiment of the present invention.

[0109] The technical solution provided by the embodiment of the present invention increases the voltage at one end where the driving module is connected to the voltage control module by adding a voltage control module to the connection path between the driving module and the light-emitting module to cut off the direct connection between the driving module and the light-emitting module, and controls the voltage control module to control the voltage at one end where the driving module is connected to the voltage control module when the displayed grayscale is less than a preset grayscale. This can increase the voltage at one end where the driving module is connected to the voltage control module, thereby reducing the voltage difference between the first end and the second end of the driving module, and further reducing the leakage of the driving module at low grayscale, limiting the current flowing to the light-emitting module, thereby improving the display brightness at low grayscale, and helping to improve the display effect.

[0110] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0111] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0112] Figure 1 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0113] Figure 2 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0114] Figure 3 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0115] Figure 4 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0116] Figure 5 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0117] Figure 6 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0118] Figure 7 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0119] Figure 8 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0120] Fig. 9 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0121] Fig.10 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0122] Fig.11 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0123] Fig.12 A driving timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0124] Fig.13 A schematic diagram of grayscale expansion provided by an embodiment of the present invention;

[0125] Fig.14 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0126] Fig.15 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0127] Fig.16 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0128] Fig.17 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0129] Fig.18 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0130] Fig.19 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0131] Fig. 20 A driving timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0132] Fig.21 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0133] Fig. 22 A schematic diagram of the structure of another display panel is provided for an embodiment of the present invention;

[0134] Fig.23 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0135] Fig.24 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0136] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0137] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0138] In a display panel, a pixel circuit is usually included. The pixel circuit includes a driving module and a light-emitting device. The driving module drives the light-emitting device to emit light, and the driving current directly affects the brightness of the light-emitting device. In recent years, with the emergence of large-voltage devices such as stacked light-emitting devices and quantum dot light-emitting devices, the difference between the anode voltage of the light-emitting device in the black state and the bright state is large. When displaying low grayscale, the anode voltage of the light-emitting device is very low, resulting in a large voltage difference across the driving module, which increases the leakage current of the driving module, thereby affecting the low grayscale brightness and reducing the display effect.

[0139] In view of the above problems, an embodiment of the present invention provides a pixel circuit to improve the black state brightness, thereby achieving a black state display effect. Figure 1 A schematic diagram of a pixel circuit according to an embodiment of the present invention is provided. Figure 1 The pixel circuit provided in the embodiment of the present invention includes a driving module 110, a voltage control module 120 and a light-emitting module 130. The driving module 110 and the voltage control module 120 are connected between a first power line L1 and a first end of the light-emitting module 130. The second end of the light-emitting module 130 is connected to a second power line L2. The driving module 110 is used to drive the light-emitting module 130 to emit light. The voltage control module 120 is used to control the voltage at one end of the driving module 110 connected to the voltage control module 120 when the displayed grayscale is less than a preset grayscale, so as to limit the current flowing to the light-emitting module 130.

[0140] Specifically, the preset grayscale can be used to divide low grayscale and medium-high grayscale. For example, when the current display grayscale is less than the preset grayscale, it can be characterized as low grayscale; when the current display grayscale is greater than or equal to the preset grayscale, it can be characterized as medium-high grayscale.

[0141] The pixel circuit further includes a data writing module 140 , which is used to transmit a data voltage Vdata to the driving module 110 , and different display grayscales correspond to different data voltages Vdata.

[0142] When the displayed grayscale is a medium-high grayscale, the data voltage Vdata corresponding to the current displayed grayscale is written to the control end of the driving module 110 through the data writing module 140, the driving module 110 generates a larger driving current, and the voltage control module 120 remains in the on state under the action of the voltage of the second end N2 of the driving module 110. The driving module 110 drives the light-emitting module 130 to emit light, thereby realizing a medium-high grayscale display.

[0143] When the displayed grayscale is a low grayscale, the data voltage Vdata corresponding to the current displayed grayscale is written to the control end of the driving module 110 through the data writing module 140, the driving module 110 generates a smaller driving current, and the voltage control module 120 is turned off or half-turned on under the action of the voltage at the second end N2 of the driving module 110 to achieve low grayscale display.

[0144] The technical solution provided by the embodiment of the present invention increases the voltage control module 120 on the connection path between the driving module 110 and the light-emitting module 130 to cut off the direct connection between the driving module 110 and the light-emitting module 130, and controls the voltage control module 120 to control the voltage of one end connecting the driving module 110 and the voltage control module 120 when the displayed grayscale is less than the preset grayscale, thereby raising the voltage of one end connecting the driving module 110 and the voltage control module 120, thereby reducing the voltage difference between the first end N1 and the second end N2 of the driving module 110, thereby reducing the leakage of the driving module 110 at low grayscale, limiting the current flowing to the light-emitting module 130, thereby improving the display brightness at low grayscale, and facilitating improving the display effect.

[0145] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2, based on the above embodiment, optionally, when the displayed grayscale is less than the preset grayscale, the transistor included in the voltage control module is in the cut-off region or the subthreshold region. Exemplarily, the driving module 110 includes a first transistor M1, the voltage control module 120 includes a second transistor M2, the light emitting module 130 includes a light emitting diode D1, the second electrode of the first transistor M1 is connected to the first electrode of the second transistor M2, and the second electrode of the second transistor M2 is connected to the first electrode (anode) of the light emitting diode D1. For example, the first transistor M1 and the second transistor M2 are both P-type transistors, the first electrode is the source, and the second electrode is the drain.

[0146] The control end of the voltage control module 120 is connected to the first voltage signal line, and the first voltage signal line is used to transmit the first voltage V1. When the displayed gray scale is less than the preset gray scale, the first voltage V1 is greater than the voltage of the first end of the light emitting module 130, and the absolute value of the difference between the first voltage V1 and the voltage of one end of the driving module 110 is less than the absolute value of the threshold voltage of the voltage control module 120, and the one end of the driving module 110 is the end connected to the voltage control module 120. That is, by setting the first voltage V1, the voltage difference between the first voltage V1 and the voltage of the second end N2 of the driving module 110 is less than the threshold voltage Vth2 of the second transistor M2, so that the second transistor M2 is in the subthreshold region. At low grayscale, the gate voltage of the second transistor M2 is fixed at the first voltage V1. Due to the inherent characteristics of the subthreshold region, the voltage of the first electrode (source) of the second transistor M2 will be limited to a relatively stable range. Therefore, the voltage of the first electrode of the second transistor M2 (that is, the voltage of the second terminal N2 of the driving module 110) changes less than V1-Vth2. Even if the voltage of the first electrode of the light-emitting diode D1 is small at low grayscale, it will not significantly reduce the voltage of the first electrode of the second transistor M2, thereby increasing the voltage of the second terminal N2 of the driving module 110, thereby reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, which is beneficial to reducing the leakage current of the driving module 110.

[0147] Optionally, in this embodiment, the preset grayscale may be grayscale 16 or grayscale 32. When the displayed grayscale is grayscale 0, a black picture is displayed, that is, in a black state.

[0148] The technical solution provided in this embodiment sets the first voltage V1 connected to the control terminal of the voltage control module 120, so that when the displayed grayscale is less than the preset grayscale, the second transistor included in the voltage control module 120 is in the subthreshold region, so that the voltage of the second terminal N2 of the driving module 110 is limited to a relatively stable range and will not drop to the voltage of the first pole of the light-emitting diode D1, thereby achieving the purpose of increasing the voltage of the second terminal N2 of the driving module 110, reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, and reducing the leakage current of the driving module 110. When displaying a black picture, since the leakage current of the driving module 110 is small, the display effect can be guaranteed to avoid the phenomenon that the black state is not black enough.

[0149] Optionally, when a black screen is displayed, the second transistor M2 included in the voltage control module 120 may also be in the cut-off region, which can also increase the voltage of the second terminal N2 of the driving module 120. The principle is similar to that of the second transistor M2 being in the subthreshold region, which will not be repeated here.

[0150] Optionally, when the displayed grayscale is greater than or equal to a preset grayscale, the transistor included in the voltage control module 120 is in a linear region or a saturation region, the absolute value of the difference between the first voltage V1 and the voltage at one end of the driving module 110 is greater than or equal to the absolute value of the threshold voltage of the voltage control module 120, and one end of the driving module 110 is the end connected to the voltage control module 120.

[0151] Specifically, when the displayed grayscale is greater than or equal to the preset grayscale, the driving current generated by the driving module 110 is relatively large, and the voltage at the second terminal N2 of the driving module 110 is relatively large, so that the absolute value of the gate-source voltage of the second transistor M2 included in the voltage control module 120 is much larger than the absolute value of the threshold voltage Vth2 of the second transistor M2, and the second transistor M2 is in a fully turned-on state, which will not affect the normal display process.

[0152] Optionally, in this embodiment, the first voltage V1 may be a DC voltage. By properly configuring the voltage value of the first voltage V1, the second transistor M2 may be in a subthreshold region when displaying low grayscales, so as to increase the voltage of the second terminal N2 of the driving module 110. Also, when displaying medium and high grayscales, the second transistor M2 may be in a linear region or a saturation region, without affecting the normal display of medium and high grayscales.

[0153] Figure 3 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 3On the basis of the above embodiments, optionally, the pixel circuit further includes a first light-emitting control module 150 and a second light-emitting control module 160, wherein the control end of the first light-emitting control module 150 is connected to the first light-emitting control signal line, and the control end of the second light-emitting control module 160 is connected to the second light-emitting control signal line; the first end of the first light-emitting control module 150 is connected to the first power line L1, the second end of the first light-emitting control module 150 is connected to the first end N1 of the driving module 110, the second end N2 of the driving module 110 is connected to the first end of the voltage control module 120, the second end of the voltage control module 120 is connected to the first end of the second light-emitting control module 160, and the second end of the second light-emitting control module 160 is connected to the first end of the light-emitting module 130. The first light-emitting control signal line is used to transmit the first light-emitting control signal EM1, and the second light-emitting control signal line is used to transmit the second light-emitting control signal EM2. The first light-emitting control module 150 and the second light-emitting control module 160 are used to be turned on in the light-emitting stage to control the light-emitting module 130 to emit light.

[0154] Figure 4 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 4 , the voltage control module 120 can also be connected between the second light control module 160 and the light module 130. Specifically, the first end of the first light control module 150 is connected to the first power line L1, the second end of the first light control module 150 is connected to the first end N1 of the driving module 110, the second end N2 of the driving module 110 is connected to the first end of the second light control module 160, the second end of the second light control module 160 is connected to the first end of the voltage control module 120, and the second end of the voltage control module 120 is connected to the first end of the light module 130.

[0155] in, Figure 3 The pixel circuit shown is Figure 4 The specific working principle of the pixel circuits shown is the same, that is, when displaying low grayscale, the voltage of the second terminal N2 of the driving module 110 is raised by adjusting the first voltage V1, thereby reducing the leakage of the driving module 110. Figure 3 and Figure 4 In the pixel circuit shown, the first transistor M1 included in the driving module 110 is a P-type transistor or an N-type transistor, and the second transistor M2 included in the voltage control module 120 is a P-type transistor. When the first transistor M1 is a P-type transistor, the first terminal N1 of the driving module 110 is the source of the first transistor M1, and the second terminal N2 of the driving module 110 is the drain of the first transistor M1. When the first transistor M1 is an N-type transistor, the first terminal N1 of the driving module 110 is the drain of the first transistor M1, and the second terminal N2 of the driving module 110 is the source of the first transistor M1.

[0156] Figure 5 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention, Figure 6 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 5 and Figure 6 , the second transistor M2 included in the voltage control module 120 may also be an N-type transistor. When the second transistor M2 is an N-type transistor, the second voltage control module 120 is connected between the first power line L1 and the first terminal N1 of the driving module 110. For example, Figure 5 As shown, the first end of the first light control module 150 is connected to the first power line L1, the second end of the first light control module 150 is connected to the first end of the voltage control module 120, the second end of the voltage control module 120 is connected to the first end N1 of the driving module 110, the second end N2 of the driving module 110 is connected to the first end of the second light control module 160, and the second end of the second light control module 160 is connected to the first end of the light module 130. For another example, Figure 6 As shown, the first end of the voltage control module 120 is connected to the first power line L1, the second end of the voltage control module 120 is connected to the first end of the first light-emitting control module 150, the second end of the first light-emitting control module 150 is connected to the first end N1 of the driving module 110, the second end of the driving module 110 is connected to the first end of the second light-emitting control module 160, and the second end of the second light-emitting control module 160 is connected to the first end of the light-emitting module 130.

[0157] When the second transistor M2 is an N-type transistor, the first transistor M1 is also an N-type transistor. At this time, the first terminal N1 of the driving module 110 is the drain of the first transistor M1, and the second terminal N2 of the driving module 110 is the source of the first transistor M1.

[0158] In this embodiment, when the second transistor M2 is connected between the first power line L1 and the first terminal N1 of the driving module 110, since the second transistor M2 is an N-type transistor, the first voltage V1 at this time is positive, and at low grayscale, the difference between the first voltage V1 and the voltage of the first terminal N1 of the driving module 110 is less than the threshold voltage Vth2 of the second transistor M2, so as to ensure that the second transistor M2 is in the subthreshold region. By adjusting the first voltage V1, the voltage change of the second electrode (source) of the second transistor M2 can be made less than V1+Vth2, so as to avoid the voltage of the second electrode of the second transistor M2 rising to the first power supply voltage VDD, that is, the voltage of the first terminal N1 of the driving module 110 is less than the first power supply voltage VDD, which is conducive to reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, thereby reducing the leakage of the driving module 110, so as to achieve low grayscale display, and also avoid the phenomenon that the black state is not black enough.

[0159] Figure 7 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention, Figure 8 FIG. 1 is a schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, which may correspond to the overall structure of the pixel circuit when the first transistor M1 is a P-type transistor. Figure 7 and Figure 8 The pixel circuit provided in this embodiment further includes a first initialization module 170, wherein the control end of the first initialization module 170 is connected to the first scan signal line, the first end of the first initialization module 170 is connected to the second voltage signal line, and the second end of the first initialization module 170 is connected to the first end of the light emitting module 130. The first scan signal line is used to transmit the first scan signal S1, and the first initialization module 170 is used to transmit the second initialization voltage Vref2 transmitted on the second voltage signal line to the first end of the light emitting module 130 in response to the first scan signal S1, so as to initialize the light emitting module 130.

[0160] The pixel circuit further includes a data writing module 140, the control end of which is connected to the second scanning signal line, the data writing module 140 is connected to the driving module 110, and the data writing module 140 is used to write the data voltage Vdata to the control end G of the driving module 110. The pixel circuit further includes a compensation module 160, the control end of which is connected to the second scanning signal line, the compensation module 160 is connected between the second end N2 of the driving module 110 and the control end G, and the compensation module 160 is used to compensate for the threshold voltage of the driving module 110. The data writing module 140 is connected to the first end N1 of the driving module 110, and the second scanning signal line is used to transmit the second scanning signal S2.

[0161] The pixel circuit further includes a storage module 150 , and the storage module 150 is connected to the control terminal G of the driving module 110 .

[0162] The pixel circuit further includes a second initialization module 190, a control end of the second initialization module 190 is connected to the third scan signal line, a first end of the second initialization module 190 is connected to the third voltage signal line, and a second end of the second initialization module 190 is connected to the control end G of the driving module 110. The third scan signal line is used to transmit the third scan signal S3, and the second initialization module 190 is used to transmit the first initialization voltage Vref1 on the third voltage signal line to the control end G of the driving module 110 in response to the third scan signal S3.

[0163] Specifically, the first light emitting control module 150 includes a third transistor M3, and the second light emitting control module 160 includes a fourth transistor M4. The gate of the third transistor M3 is connected to the first light emitting control signal line, the first electrode of the third transistor M3 is connected to the first power line L1, the first electrode of the first transistor M1 is connected to the second electrode of the third transistor M3 as the first terminal N1 of the driving module 110, and the second electrode of the first transistor M1 is connected to the first electrode of the second transistor M2 as the second terminal N2 of the driving module 110 (such as Figure 7 As shown), the second electrode of the second transistor M2 is connected to the first electrode of the fourth transistor M4, the second electrode of the fourth transistor M4 is connected to the first electrode of the light emitting diode D1, the second electrode of the light emitting diode D1 is connected to the second power line L2, the gate of the second transistor M2 is connected to the first voltage signal line, and the gate of the fourth transistor M4 is connected to the second light emitting control signal line. Alternatively, the second electrode of the first transistor M1 is connected to the first electrode of the fourth transistor M4 as the second terminal N2 of the driving module 110 (as shown). Figure 8 As shown), the second electrode of the fourth transistor M4 is connected to the first electrode of the second transistor M2, and the second electrode of the second transistor M2 is connected to the first electrode of the light emitting diode D1.

[0164] The first initialization module 170 includes a fifth transistor M5, the gate of the fifth transistor M5 is connected to the first scan signal line, the first electrode of the fifth transistor M5 is connected to the second voltage signal line, and the second electrode of the fifth transistor M5 is connected to the first electrode of the light emitting diode D1. The data writing module 140 includes a sixth transistor M6, the compensation module 180 includes a seventh transistor M7, the storage module 150 includes a storage capacitor C1, the gate of the sixth transistor M6 and the gate of the seventh transistor M7 are both connected to the second scan signal line, the first electrode of the sixth transistor M6 is connected to the data line, the second electrode of the sixth transistor M6 is connected to the first terminal N1 of the driving module 110, the first electrode of the seventh transistor M7 is connected to the second terminal N2 of the driving module 110, the second electrode of the seventh transistor M7 is connected to the control terminal G of the driving module 110, and the storage capacitor C1 is connected between the first power line L1 and the control terminal G of the driving module 110. The second initialization module 190 includes an eighth transistor M8, the gate of the eighth transistor M8 is connected to the third scan signal line, the first electrode of the eighth transistor M8 is connected to the third voltage signal line, and the second electrode of the eighth transistor M8 is connected to the control terminal G of the driving module 110.

[0165] Optionally, in this embodiment, if Figure 8 As shown, the first light control signal line can be multiplexed into the second light control signal line, and the first light control signal EM1 is multiplexed into the second light control signal EM2. The second scan signal line or the third scan signal line is multiplexed into the first scan signal line, and the second scan signal S2 or the third scan signal S3 is multiplexed into the first scan signal S1.

[0166] Fig. 9 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention can be applied to Figure 7-Figure 8 The pixel circuit shown, for example, refers to Figure 8 Taking the third scanning signal S3 multiplexed into the first scanning signal S1 and the first light-emitting control signal EM1 multiplexed into the second light-emitting control signal EM2 as an example, the working process of the pixel circuit provided in this embodiment includes an initialization stage T1, a data writing stage T2 and a light-emitting stage T3.

[0167] In the initialization stage T1, the second scanning signal S2 is at a high level, the third scanning signal S3 is at a low level, the first light-emitting control signal EM1 is at a high level, the fifth transistor M5 and the eighth transistor M8 are turned on, and the second initialization voltage Vref2 is transmitted to the first electrode of the light-emitting diode D1 via the fifth transistor M5 to initialize the first electrode of the light-emitting diode D1; the first initialization voltage Vref1 is transmitted to the gate of the first transistor M1 via the eighth transistor M8 to initialize the gate of the first transistor M1 and turn on the first transistor M1.

[0168] In the data writing phase T2, the second scanning signal S2 is at a low level, the third scanning signal S3 is at a high level, the first light emitting control signal EM1 is at a high level, the sixth transistor M6 and the seventh transistor M7 are turned on, and the data voltage Vdata is transmitted to the gate of the first transistor M1 through the sixth transistor M6, the first transistor M1 and the seventh transistor M7 until the gate voltage of the first transistor M1 is Vdata+Vth1, and the first transistor M1 is turned off. Wherein, Vth1 is the threshold voltage of the first transistor. While the data voltage Vdata is written into the gate of the first transistor M1, the threshold voltage Vth1 of the first transistor M1 is compensated.

[0169] In the light emitting stage T3, the second scanning signal S2 is at a low level, the third scanning signal S3 is at a low level, the first light emitting control signal EM1 is at a low level, the third transistor M3 and the fourth transistor M4 are turned on, and the first transistor M1 generates a driving current to drive the light emitting diode D1 to emit light.

[0170] Among them, when the displayed gray scale is lower than the preset gray scale, the driving current generated by the first transistor M1 is small, the voltage of the first pole of the light-emitting diode D1 (anode voltage) is low, and under the action of the first voltage V1, the second transistor M2 is in the subthreshold region, so the voltage of the first pole of the second transistor M2 is greater than V1-Vth2, and the absolute value of the first voltage V1 is greater than the anode voltage at this time, and the first voltage V1 can be configured so that the absolute value of V1-Vth2 is still greater than the anode voltage, thereby raising the voltage of the second terminal N2 of the driving module 110, thereby reducing the leakage of the first transistor M1. Especially when displaying a black picture, it can avoid the phenomenon that the black state is not black enough.

[0171] When the displayed grayscale is higher than the preset grayscale, the driving current generated by the first transistor M1 is relatively large, so that the voltage of the second terminal N2 of the driving module 110 is relatively large, and the second transistor M2 is in the linear region or the saturation region, which will not affect the light emission of the light emitting diode D1.

[0172] Fig.10 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention, Fig.11 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention, Fig.10 and Fig.11 The difference between the structures shown is that the connection relationship and channel type of the second transistor M2 are different. Fig.10 The second transistor M2 in the pixel circuit shown is a P-type transistor, connected between the second terminal N2 of the driving module 110 and the first terminal of the light emitting module 130; Fig.11 The second transistor M2 in the pixel circuit shown is an N-type transistor, connected between the first power line L1 and the first terminal N1 of the driving module 110. Fig.10 and Fig.11, which corresponds to the overall structure of the pixel circuit when the first transistor M1 is an N-type transistor, the compensation module 180 is connected between the first terminal N1 and the control terminal G of the driving module 110, the control terminal of the compensation module 180 is connected to the first scanning signal line, the data writing module 140 is connected between the data line and the second terminal N2 of the driving module 110, the control terminal of the data writing module 140 is connected to the second scanning signal line, and the storage module 150 is connected between the control terminal G of the driving module 110 and the first terminal of the light emitting module 130. Here, there is no need to set the third initialization module 190, and the initialization of the control terminal G of the driving module 110 can be achieved through the first power supply voltage VDD. Among them, the gate of the sixth transistor M6 is connected to the second scan signal line, the gate of the seventh transistor M7 is connected to the first scan signal line, the first electrode of the sixth transistor M6 is connected to the data line, the second electrode of the sixth transistor M6 is connected to the second end N2 of the driving module 110, the first electrode of the seventh transistor M7 is connected to the first end N1 of the driving module 110, the second electrode of the seventh transistor M7 is connected to the control end G of the driving module 110, and the storage capacitor C1 is connected between the first end of the light emitting module 130 and the control end G of the driving module 110.

[0173] Fig.12 Another driving timing diagram of a pixel circuit provided in an embodiment of the present invention can be applied to Fig.10 and Fig.11 The pixel circuit shown in Figure 2 is referenced Figure 10-12 In the initialization stage T1, the second scanning signal S2 is at a high level, the first scanning signal S1 is at a low level, the first light-emitting control signal EM1 is at a low level, the second light-emitting control signal EM2 is at a high level, the third transistor M3, the fifth transistor M5 and the seventh transistor M7 are turned on, and the second initialization voltage Vref2 is transmitted to the first electrode of the light-emitting diode D1 through the fifth transistor M5 to initialize the first electrode of the light-emitting diode D1; the first power supply voltage VDD is transmitted to the gate of the first transistor M1 through the third transistor M3 and the seventh transistor M7 to initialize the gate of the first transistor M1 and turn on the first transistor M1. When the first light-emitting control signal EM1 jumps from a low level to a high level, the third transistor M3 is turned off. The data writing stage T2 and the light-emitting stage T3 are similar to the description in the above embodiment and are not repeated here. In this embodiment, when the first transistor M1 is an N-type transistor, the second transistor M2 is preferably selected as an N-type transistor, which is conducive to the stable operation of the pixel circuit under full grayscale.

[0174] Fig.13 A grayscale expansion schematic diagram provided by an embodiment of the present invention may correspond to Figure 8 The pixel circuit shown in FIG. Fig.13It can be seen that at low grayscale (i.e., the displayed grayscale is less than the preset grayscale), it can be well expanded (such as 32 grayscales, 16 grayscales, 8 grayscales, 4 grayscales, 2 grayscales, 1 grayscale, etc.). At medium and high grayscale (i.e., the displayed grayscale is greater than or equal to the preset grayscale), the displayed grayscale can also be well expanded (such as 255 grayscales, 128 grayscales, 64 grayscales, etc.).

[0175] Fig.14 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.14 ,exist Figure 1 On the basis of the pixel circuit shown, the first control terminal of the voltage control module 120 is connected to the second light-emitting control signal line, and the second control terminal of the voltage control module 120 is connected to the control terminal G of the driving module 110. The threshold voltage of the voltage control module 120 is adjusted by the voltage of the second control terminal, so as to adjust the conduction state of the voltage control module 120. For example, when the displayed gray scale is less than the preset gray scale, the voltage control module 120 is adjusted to be in a semi-conducting state, thereby raising the voltage of the second terminal N2 of the driving module 110 to reduce the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, which is beneficial to reduce the leakage current of the driving module 110, especially when displaying a black picture, it can avoid the phenomenon that the black state is not black enough.

[0176] Continue to refer Fig.14 The pixel circuit also includes a first light-emitting control module 150, a control end of the first light-emitting control module 150 is connected to the first light-emitting control signal line, a first end of the first light-emitting control module 150 is connected to the first power line L1, a second end of the first light-emitting control module 150 is connected to the first end N1 of the driving module 110, a second end N2 of the driving module 110 is connected to the first end of the voltage control module 120, and a second end of the voltage control module 120 is connected to the first end of the light-emitting module 130.

[0177] The first light-emitting control signal line is used to transmit the first light-emitting control signal EM1, the second light-emitting control signal line is used to transmit the second light-emitting control signal EM2, and the first light-emitting control signal line can be multiplexed as the second light-emitting control signal line.

[0178] Fig.15 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.15On the basis of the above embodiment, optionally, the driving module 110 includes a first transistor M1, the voltage control module 120 includes a second transistor M2, the first light-emitting control module 150 includes a third transistor M3, the light-emitting module 130 includes a light-emitting diode D1, the gate of the third transistor M3 is connected to the first light-emitting control signal line, the first electrode of the third transistor M3 is connected to the first power line L1, the first electrode of the first transistor M1 is connected to the second electrode of the third transistor M3 as the first end N1 of the driving module 110, the second electrode of the first transistor M1 is connected to the first electrode of the second transistor M2 as the second end N2 of the driving module 110, the second electrode of the second transistor M2 is connected to the first electrode of the light-emitting diode D1, the second electrode of the light-emitting diode D1 is connected to the second power line L2, the first gate of the second transistor M2 is connected to the second light-emitting control signal line, and the second gate of the second transistor M2 is connected to the gate of the first transistor M1.

[0179] Specifically, taking the first transistor M1 and the second transistor M2 as P-type transistors as an example, the first gate of the second transistor M2 is a top gate, and the second gate of the second transistor M2 is a bottom gate. In the data writing stage, the data voltage Vdata is written to the gate of the first transistor M1 through the data writing module 140. In the display stage, when the display grayscale is less than the preset grayscale, for example, when a black screen is displayed, the gate voltage of the first transistor M1 is a positive voltage. Under the action of the gate voltage of the first transistor M1, the threshold voltage Vth2 of the second transistor M2 is negatively biased. When the second light-emitting control signal EM2 connected to the first gate of the second transistor M2 is fixed, the conduction degree of the second transistor M2 can be reduced, and the second transistor M2 works in the subthreshold region. Therefore, the voltage of the first pole of the second transistor M2 is limited to a relatively stable range and will not be reduced to the voltage of the first pole of the light-emitting diode D1, thereby achieving the purpose of increasing the voltage of the second terminal N2 of the driving module 110, reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, and reducing the leakage current of the driving module 110.

[0180] Optionally, in this embodiment, the second transistor M2 is a vertical dual-gate transistor, and the channel type of the first transistor M1 is the same as the channel type of the second transistor M2.

[0181] Of course, in other embodiments, the first transistor M1 and the second transistor M2 may both be N-type transistors. Fig.16 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.16, the control end of the first light control module 150 is connected to the first light control signal line, the first end of the voltage control module 120 is connected to the first power line L1, the second end of the voltage control module 120 is connected to the first end N1 of the driving module 110, the second end of the driving module 110 is connected to the first end of the first light control module 150, and the second end of the first light control module 150 is connected to the first end of the light emitting module 130. The first control end of the voltage control module 120 is connected to the second light control signal line, and the second control end of the voltage control module 120 is connected to the control end G of the driving module 110.

[0182] Specifically, the driving module 110 includes a first transistor N1, the voltage control module 120 includes a second transistor M2, the first light control module 150 includes a third transistor M3, the light emitting module 130 includes a light emitting diode D1, the first gate of the second transistor M2 is connected to the second light emitting control signal line, the second gate of the second transistor M2 is connected to the gate of the first transistor M1, the first electrode of the second transistor M2 is connected to the first power line L1, the first electrode of the first transistor M1 is connected to the second electrode of the second transistor M2 as the first terminal N1 of the driving module 110, the second electrode of the first transistor M1 is connected to the first electrode of the third transistor M3 as the second terminal N2 of the driving module 110, the second electrode of the third transistor M3 is connected to the first electrode of the light emitting diode D1, and the second electrode of the light emitting diode D1 is connected to the second power line L2. Among them, the first light emitting control signal line can be reused as the second light emitting control signal line. The specific working principle of this circuit is similar to the working principle of the first transistor M1 being a P-type transistor, and will not be repeated.

[0183] Fig.17 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.17 The connection relationship between the data writing module 140, the storage module 150, the compensation module 180, the first initialization module 170 and the second initialization module 190 is as follows: Figure 7 The structure shown is the same, Fig.17 The pixel circuit shown is also applicable to Fig. 9 The specific working process of the driving timing, initialization phase and data writing phase shown will not be repeated.

[0184] In the light-emitting stage, when the displayed grayscale is lower than the preset grayscale, the gate voltage of the first transistor M1 is relatively large and is a positive voltage, so that the threshold voltage of the second transistor M2 is negatively biased. In conjunction with the first light-emitting control signal EM1, the second transistor M2 is in the subthreshold region, so the voltage of the first pole of the second transistor M2 is greater than V2-Vth2, wherein the second voltage V2 is the effective level of the first light-emitting control signal EM1. The absolute value of the second voltage V2 is greater than the anode voltage at this time, and the second voltage V2 can be configured so that the absolute value of V2-Vth2 is still greater than the anode voltage, thereby raising the voltage of the second terminal N2 of the driving module 110, thereby reducing the leakage of the first transistor M1. Especially when displaying a black screen, it can avoid the phenomenon that the black state is not black enough.

[0185] When the displayed grayscale is higher than the preset grayscale, the gate voltage of the first transistor M1 is small and negative, so that the threshold voltage of the second transistor M2 is positively biased. The second transistor M2 is in the linear region or the saturation region and will not affect the light emission of the light emitting diode D1.

[0186] Of course, in other embodiments, when the first transistor M1 and the second transistor M2 are N-type transistors (the first light emitting control signal EM1 and the second light emitting control signal EM2 are independent of each other), the connection relationship between the data writing module 140, the storage module 150, the compensation module 180, and the first initialization module 170 is the same as Fig.11 The structure shown is the same, and the operation process of the pixel circuit is similar to the operation process when the second transistor M2 is a P-type transistor, except that the conduction level and the data voltage Vdata are opposite.

[0187] exist Fig.17 In the pixel circuit shown, the level of the first light-emitting control signal E1 is different from the levels of the first scanning signal S1, the second scanning signal S2, and the third scanning signal S3. By coordinating the independent level of the first light-emitting control signal EM1 with the bottom gate of the second transistor M2, the switching state of the second transistor M2 at low grayscale and medium and high grayscale can be optimized.

[0188] Fig.18 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.18 ,exist Figure 1Based on the described embodiment, optionally, the voltage control module 120 includes a first sub-control module 121 and a second sub-control module 122, the control end of the first sub-control module 121 is connected to the first light-emitting control signal line, the control end of the second sub-control module 122 is connected to the second light-emitting control signal line, the first end of the first sub-control module 121 is connected to the first power line L1, the second end of the first sub-control module 121 is connected to the first end N1 of the driving module 110, the second end N2 of the driving module 110 is connected to the first end of the second sub-control module 122, and the second end of the second sub-control module 122 is connected to the first end of the light-emitting module 110.

[0189] Among them, when the displayed gray scale is less than the preset gray scale, the transistors included in the first sub-control module 121 and / or the second sub-control module 122 are in the sub-threshold region to raise the voltage of the second terminal N2 of the driving module 110, thereby reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, so as to reduce the leakage current of the driving module 110, ensure a good display effect at a low gray scale, and avoid the phenomenon that the black state is not black enough.

[0190] Fig.19 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.19 On the basis of the above embodiments, optionally, the driving module 110 includes a first transistor M1, the first sub-control module 121 includes a ninth transistor M9, the second sub-control module 122 includes a tenth transistor M10, the light-emitting module 130 includes a light-emitting diode D1, the gate of the ninth transistor M9 is connected to the first light-emitting control signal line, the first electrode of the ninth transistor M9 is connected to the first power line L1, the second electrode of the ninth transistor M9 is connected to the first electrode of the first transistor M1, the second electrode of the first transistor M1 is connected to the first electrode of the tenth transistor M10, the second electrode of the tenth transistor M10 is connected to the first electrode of the light-emitting diode D1, the second electrode of the light-emitting diode D1 is connected to the second power line L2, and the gate of the tenth transistor M10 is connected to the second light-emitting control signal line.

[0191] The pixel circuit further includes a first initialization module 170, a control end of the first initialization module 170 is connected to the first scan signal line, a first end of the first initialization module 170 is connected to the second voltage signal line, and a second end of the first initialization module 170 is connected to the first end of the light emitting module 130. The first initialization module 170 includes a fifth transistor M5, a gate of the fifth transistor M5 is connected to the first scan signal line, a first electrode of the fifth transistor M5 is connected to the second voltage signal line, and a second electrode of the fifth transistor M5 is connected to the first electrode of the light emitting diode D1.

[0192] The absolute value of the effective level of the first light-emitting control signal EM1 transmitted on the first light-emitting control signal line is smaller than the absolute value of the effective level of the first scanning signal S1 transmitted on the first scanning signal line; and / or the absolute value of the effective level of the second light-emitting control signal EM2 transmitted on the second light-emitting control signal line is smaller than the absolute value of the effective level of the first scanning signal S1 transmitted on the first scanning signal line.

[0193] Specifically, the channel type of the ninth transistor M9 and the tenth transistor M10 is the same, for example, both are P-type transistors, the fifth transistor M5 is also a P-type transistor, and the fifth transistor M5, the ninth transistor M9 and the tenth transistor M10 are all turned on at a low level and turned off at a high level. In this embodiment, the absolute value of the effective level (low level) of the first light-emitting control signal EM1 is less than the absolute value of the effective level (low level) of the first scanning signal S1; or, the absolute value of the effective level (low level) of the second light-emitting control signal EM2 is less than the absolute value of the effective level (low level) of the first scanning signal S1; or, the absolute value of the effective level (low level) of the first light-emitting control signal EM1 is less than the absolute value of the effective level (low level) of the first scanning signal S1, and the absolute value of the effective level (low level) of the second light-emitting control signal EM2 is less than the absolute value of the effective level (low level) of the first scanning signal S1. Therefore, under low gray scale, the conduction degree of the ninth transistor M9 and / or the tenth transistor M10 can be made lower than the conduction degree of the fifth transistor M5, that is, the ninth transistor M9 and / or the tenth transistor M10 is in the subthreshold region, which can also raise the voltage of the second terminal N2 of the driving module 110 or reduce the voltage of the first terminal N1 of the driving module 110, thereby reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, which is beneficial to reducing the leakage current of the driving module 110.

[0194] The pixel circuit also includes a data writing module 140, the control end of the data writing module 140 is connected to the second scanning signal line, the data writing module 140 is connected to the driving module 110, and the data writing module 140 is used to write the data voltage Vdata to the control end G of the driving module 110; the pixel circuit also includes a compensation module 180, the control end of the compensation module 180 is connected to the second scanning signal line, the compensation module 180 is connected between the second end N2 of the driving module 110 and the control end G, and the compensation module 180 is used to compensate for the threshold voltage of the driving module 110.

[0195] The absolute value of the effective level of the second scan signal S2 is the same as the absolute value of the effective level of the second light-emitting control signal EM2 transmitted on the second light-emitting control signal line, or the absolute value of the effective level of the second scan signal S2 is the same as the absolute value of the effective level of the first light-emitting control signal EM1 transmitted on the first light-emitting control signal line.

[0196] Specifically, the absolute value of the effective level of the second scanning signal S2 is set to be the same as the absolute value of the effective level of the first light-emitting control signal EM1 or the second light-emitting control signal EM2. This can avoid the phenomenon that the seventh transistor M7 included in the compensation module 180 is excessively coupled due to the jump of the second scanning signal S2 caused by the effective level of the second scanning signal S2 being too low, which is beneficial to improving the stability of the voltage at the control terminal G of the driving module 110 and improving the display uniformity.

[0197] The pixel circuit also includes a storage module 150, which is connected to the control terminal G of the driving module 110; the data writing module 140 includes a sixth transistor M6, the compensation module 180 includes a seventh transistor M7, the storage module 150 includes a storage capacitor C1, the gate of the sixth transistor M6 and the gate of the seventh transistor M7 are both connected to the second scanning signal line, the first electrode of the sixth transistor M6 is connected to the data line, the second electrode of the sixth transistor M6 is connected to the first terminal N1 of the driving module 110, the first electrode of the seventh transistor M7 is connected to the second terminal N2 of the driving module 110, the second electrode of the seventh transistor M7 is connected to the control terminal G of the driving module 110, and the storage capacitor C1 is connected between the first power line L1 and the control terminal G of the driving module 110.

[0198] The pixel circuit further includes a second initialization module 190, a control end of the second initialization module 190 is connected to the third scan signal line, a first end of the second initialization module 190 is connected to the third voltage signal line, and a second end of the second initialization module 190 is connected to the control end G of the driving module 110; the second initialization module 190 includes an eighth transistor M8, a gate of the eighth transistor M8 is connected to the third scan signal line, a first electrode of the eighth transistor M8 is connected to the third voltage signal line, and a second electrode of the eighth transistor M8 is connected to the control end G of the driving module 110. The first scan signal S1 can be multiplexed into the third scan signal S3.

[0199] Fig. 20 Another driving timing diagram of a pixel circuit provided in an embodiment of the present invention can be applied to Fig.19 The pixel circuit shown in Figure 2 is referenced Fig. 20 The working process of the pixel circuit includes an initialization stage T1, a data writing stage T2 and a light emitting stage T3, wherein the working processes of the initialization stage T1 and the data writing stage T2 are the same as the working processes described in the above embodiments and will not be repeated herein.

[0200] In this embodiment, in the light-emitting stage T3, the first scanning signal S1, the second scanning signal S2 and the third scanning signal S3 are at a high level, the first light-emitting control signal EM1 and the second light-emitting control signal EM2 are at a low level, and the ninth transistor M9 and the tenth transistor M10 are turned on. When the displayed gray scale is less than the preset gray scale, the driving current generated by the first transistor M1 is small, and by adjusting the effective level of the second light-emitting control signal EM2 to VGL (VGL is greater than the effective level VGLL of the third scanning signal S3), the tenth transistor M10 can be configured to work in the subthreshold region, thereby raising the voltage of the second terminal N2 of the driving module 110 to reduce the leakage current of the driving module 110.

[0201] Of course, in other embodiments, the effective level of the first light emitting control signal EM1 may be adjusted, or the effective levels of the first light emitting control signal EM1 and the second light emitting control signal EM2 may be adjusted simultaneously, which has the same beneficial effects as the above embodiments and will not be described in detail here.

[0202] Optionally, the first transistor M1 may also be an N-type transistor. In this case, the connection relationship between the data writing module 140, the storage module 150, the compensation module 180, and the first initialization module 170 is the same as Fig.11 The architecture shown is the same.

[0203] Optionally, in Fig.19 In the pixel circuit shown, the first light-emitting control signal EM1 can be multiplexed into the second light-emitting control signal EM2, and the third scan signal S3 can be multiplexed into the first scan signal S1, that is, the first light-emitting control signal line is multiplexed into the second light-emitting control signal line, and the third scan signal line is multiplexed into the first scan signal line, which is beneficial to saving the number of signal lines, thereby improving PPI.

[0204] Optionally, the effective level of the second scan signal S2 may be the same as the effective level of the third scan signal S3, both of which are VGLL. Alternatively, the effective level of the second scan signal S2 may be the same as the effective level of the first light emitting control signal EM1, both of which are VGL.

[0205] Optionally, the technical solution provided by the embodiment of the present invention can be applied not only to the pixel circuit of the 7T1C architecture based on LTPS in the above-mentioned embodiment, but also to 8T1C (adding a transistor for applying a bias voltage to the source of the driving transistor on the basis of 7T1C) or a pixel circuit of the 7T1C architecture based on LTPO, with the same beneficial effects.

[0206] Optionally, an embodiment of the present invention provides a driving method for a pixel circuit, combining Figure 1 , the driving method of the pixel circuit provided in this embodiment includes:

[0207] In the light-emitting stage, the driving module is controlled to drive the light-emitting module to emit light; wherein, when the displayed grayscale is less than the preset grayscale, the voltage control module is controlled to control the voltage at one end connecting the driving module and the voltage control module.

[0208] The technical solution provided by the embodiment of the present invention increases a voltage control module on the connection path between the driving module and the light-emitting module to cut off the direct connection between the driving module and the light-emitting module, and controls the voltage control module to control the voltage of one end connected to the driving module and the voltage control module when the displayed grayscale is less than a preset grayscale. The voltage of one end connected to the driving module and the voltage control module can be raised, thereby reducing the voltage difference between the first end and the second end of the driving module, thereby reducing the leakage of the driving module at low grayscale, thereby improving the display brightness at low grayscale, and helping to improve the display effect.

[0209] Optionally, combined Figure 2 The voltage control module 120 includes a transistor, such as a second transistor M2. The step of controlling the voltage control module 120 to turn off specifically includes:

[0210] The transistor in the control voltage control module is in a subthreshold region in response to a signal at a control terminal of the voltage control module.

[0211] Optionally, the driving method of the pixel circuit provided in this embodiment further includes:

[0212] In the non-light-emitting stage, the transistor in the control voltage control module is in the cut-off region in response to the signal at the control end of the voltage control module.

[0213] Specifically, combined Figure 2, the control end of the voltage control module 120 is connected to the first voltage signal line, and the first voltage signal line is used to transmit the first voltage V1. When the displayed gray scale is less than the preset gray scale, the first voltage V1 is greater than the voltage of the first end of the light emitting module 130, and the absolute value of the difference between the first voltage V1 and the voltage of one end of the driving module 110 is less than the absolute value of the threshold voltage of the voltage control module 120, and the one end of the driving module 110 is the end connected to the voltage control module 120. That is, by setting the first voltage V1, the voltage difference between the first voltage V1 and the voltage of the second end N2 of the driving module 110 is less than the threshold voltage Vth2 of the second transistor M2, so that the second transistor M2 is in the subthreshold region. At low grayscale, the gate voltage of the second transistor M2 is fixed at the first voltage V1. Due to the inherent characteristics of the subthreshold region, the voltage of the first electrode (source) of the second transistor M2 will be limited to a relatively stable range. Therefore, the voltage of the first electrode of the second transistor M2 (that is, the voltage of the second terminal N2 of the driving module 110) changes less than V1-Vth2. Even if the voltage of the first electrode of the light-emitting diode D1 is small at low grayscale, it will not significantly reduce the voltage of the first electrode of the second transistor M2, thereby increasing the voltage of the second terminal N2 of the driving module 110, thereby reducing the voltage difference between the first terminal N1 and the second terminal N2 of the driving module 110, which is beneficial to reducing the leakage current of the driving module 110.

[0214] When the displayed grayscale is greater than or equal to the preset grayscale, the driving current generated by the driving module 110 is relatively large, and the voltage at the second terminal N2 of the driving module 110 is relatively large, so that the absolute value of the gate-source voltage of the second transistor M2 included in the voltage control module 120 is much larger than the absolute value of the threshold voltage Vth2 of the second transistor M2, and the second transistor M2 is in a fully turned-on state, which will not affect the normal display process.

[0215] Optionally, when the displayed grayscale is greater than grayscale 0 and less than a preset grayscale, the transistor in the control voltage control module is controlled to be in a subthreshold region in response to a signal at the control end of the voltage control module.

[0216] When the displayed gray scale is gray scale 0, the transistor in the control voltage control module is in a cut-off region in response to the signal at the control end of the voltage control module.

[0217] Optionally, an embodiment of the present invention further provides a display panel, which includes the pixel circuit provided by any embodiment of the present invention, so the display panel also has the beneficial effects described in any of the above embodiments. Fig.21 A schematic diagram of a display panel according to an embodiment of the present invention is provided. Figure 2 and Fig.21 , the display panel provided in this embodiment includes:

[0218] a substrate (not shown);

[0219] An active layer 60, located on one side of the substrate;

[0220] A plurality of conductive layers stacked on a side of the active layer 60 away from the substrate;

[0221] At least one pixel circuit, the pixel circuit includes a driving module 110, a voltage control module 120 and a light emitting module 130, wherein the driving module 110 includes a first transistor M1, the voltage control module 120 includes a second transistor M2, and the light emitting module 130 includes a light emitting diode D1;

[0222] The multilayer conductive layer includes a first conductive layer, the gate G1 of the first transistor M1 and the gate of the second transistor M2 are both located in the first conductive layer, and the orthographic projection of the gate of the second transistor M2 on the substrate is located between the orthographic projection of the gate G1 of the first transistor M1 on the substrate and the orthographic projection of the first electrode 51 of the light-emitting diode D1 on the substrate.

[0223] The first electrode 51 of the light emitting diode D1 is connected to the second electrode of the second transistor M2 through a via 52. In this embodiment, the second transistor M2 is arranged close to the first electrode 51 of the light emitting diode D1, which is beneficial to reducing parasitic capacitance and optimizing layout.

[0224] Fig. 22 A schematic diagram of another structure of a display panel is provided for an embodiment of the present invention. Fig.23 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, wherein: Fig.23 Specifically Fig. 22 The cross-sectional structure of the display panel shown along the cutting line AA' is shown in FIG. Figure 8 , Fig. 22 and Fig.23 On the basis of the above embodiment, optionally, the active layer 60 includes a first active layer 601, the channel region of the first transistor M1 is located in the first active layer 601, and the orthographic projection of the gate G1 of the first transistor M1 on the substrate 10 at least partially covers the orthographic projection of the channel region of the first transistor M1 on the substrate 10.

[0225] The pixel circuit further includes a storage module 150, which includes a storage capacitor C1, and the storage capacitor C1 is connected to the gate G1 of the first transistor M1. Therefore, the gate G1 of the first transistor M1 can be used as a plate of the storage capacitor C1. For example, the storage capacitor C1 includes a first plate 31 and a second plate 32, and the gate G1 of the first transistor M1 is reused as the first plate 31 of the storage capacitor C1. The first plate 31 and the second plate 32 of the storage capacitor C1 are located in different conductive layers.

[0226] Optionally, the pixel circuit further includes a first light-emitting control module 150 and a second light-emitting control module 160, the first light-emitting control module 150 includes a third transistor M3, the second light-emitting control module 160 includes a fourth transistor M4, the active layer 60 further includes a second active layer 602 and a third active layer 603, the channel region of the third transistor M3 is located in the second active layer 602, the channel region of the fourth transistor M4 is located in the third active layer 603, the orthographic projection of the gate of the third transistor M3 on the substrate 10 at least partially covers the orthographic projection of the channel region of the third transistor M3 on the substrate 10, and the orthographic projection of the gate of the fourth transistor M4 on the substrate 10 at least partially covers the orthographic projection of the channel region of the fourth transistor M4 on the substrate 10.

[0227] Optionally, continue to refer to Figure 21 to Figure 23 The display panel also includes a first voltage signal line 22, which is located in the first conductive layer. The first voltage signal line 22 overlaps with the third active layer 603 to form a second transistor M2, and the orthographic projection of the first voltage signal line 22 on the substrate 10 at least partially covers the orthographic projection of the channel region of the second transistor M2 on the substrate 10.

[0228] Specifically, the display panel provided in this embodiment further includes a first light-emitting control signal line 21, the first light-emitting control signal line 21 extends along the first direction X, and the first light-emitting control signal line 21 is arranged to cross the second active layer 602 and the third active layer 603. The first light-emitting control signal line 21 overlaps with the second active layer 602 to form a third transistor M3, and the first light-emitting control signal line 21 overlaps with the third active layer 603 to form a fourth transistor M4. The orthogonal projection of the gate of the second transistor M2 on the substrate 10 is located on the side of the orthogonal projection of the gate of the fourth transistor M4 on the substrate 10 away from the orthogonal projection of the gate G1 of the first transistor M1 on the substrate 10.

[0229] Optionally, the orthographic projection of the first light-emitting control signal line 21 on the substrate 10 is located between the orthographic projection of the first voltage signal line 22 on the substrate 10 and the orthographic projection of the gate G1 of the first transistor M1 on the substrate 10. In this embodiment, the first voltage signal line 22 extends along the first direction X, the second active layer 602 extends along the second direction Y, and the first direction X intersects the second direction Y. By arranging the second transistor M2 between the fourth transistor M4 and the first electrode 51 of the light-emitting diode D1, the first voltage signal line 22 does not need to cross the first active layer 601, that is, the orthographic projection of the first voltage signal line 22 on the substrate 10 does not overlap with the orthographic projection of the second active layer 602 on the substrate 10, so that it will not have an adverse effect on the layout of the third transistor M3 and the fourth transistor M4, which is conducive to optimizing the layout.

[0230] Optionally, the pixel circuit further includes a first initialization module 170, the first initialization module 170 includes a fifth transistor M5, the channel region of the fifth transistor M5 is located in the third active layer 603, and the display panel further includes a first scan signal line 23, the orthographic projection of the first scan signal line 23 on the substrate 10 at least partially covers the orthographic projection of the channel region of the fifth transistor M5 on the substrate 10. The first scan signal line 23 is located in the first conductive layer and extends along the first direction X, and the first scan signal line 23 overlaps the third active layer 603 to form the fifth transistor M5.

[0231] The display panel further includes a second voltage signal line 71 and a connection line 72. The multi-layer conductive layer further includes a second conductive layer and a third conductive layer. An interlayer insulating layer 13 is provided between the second conductive layer and the third conductive layer. A capacitor dielectric layer is provided between the second conductive layer and the first conductive layer. A gate insulating layer is provided between the first conductive layer and the active layer 60. The second voltage signal line 71 is located in the second conductive layer, and the connection line 72 is located in the third conductive layer. The second voltage signal line 71 is connected to one end of the connection line 72 through a via hole, and the third active layer 603 is connected to the other end of the connection line 72 through a via hole, thereby realizing the connection between the second voltage signal line 71 and the fifth transistor M5. The second voltage signal line 71 is used to transmit the second initialization voltage Vref2, and transmits the second initialization voltage Vref2 to the first electrode 51 of the light emitting diode D1 through the fifth transistor M5.

[0232] Optionally, the second voltage signal line 72 extends along the first direction X, and the connection line 71 extends along the second direction Y.

[0233] Optionally, the orthographic projection of the first scan signal line 23 on the substrate 10 is located between the orthographic projection of the first voltage signal line 22 on the substrate 10 and the orthographic projection of the second voltage signal line 71 on the substrate 10, and the orthographic projection of the first scan signal line 23 on the substrate 10 is located on a side of the orthographic projection of the first voltage signal line 22 on the substrate 10 away from the orthographic projection of the gate G1 of the first transistor M1 on the substrate 10.

[0234] In this embodiment, the channel region of the first transistor M1 is located in the first active layer 601, the channel region of the second transistor M2 is located in the third active layer 603, the channel region of the third transistor M3 is located in the second active layer 602, the channel region of the fourth transistor M4 is located in the third active layer 603, and the channel region of the fifth transistor M5 is located in the third active layer 603, wherein the first active layer 601, the second active layer 602 and the third active layer 603 are in the same layer and connected, the second active layer 602 and the third active layer 603 both extend along the second direction Y, the first active layer 601 extends along the first direction X, and the second active layer 602 and the third active layer 603 are located on different sides of the first active layer 601 to facilitate the layout.

[0235] Among them, Fig.23 In the figure, along the second direction Y, the active layer 60 shown in the dotted box below the first light-emitting control signal line 21 is the channel region of the fourth transistor M4, the active layer 60 shown in the dotted box below the first voltage signal line 22 is the channel region of the second transistor M2, and the active layer 60 shown in the dotted box below the first scanning signal line 23 is the channel region of the fifth transistor M5.

[0236] Optionally, continue to refer to Fig. 22 The display panel provided in this embodiment further includes a data line 41 and a first power line L1, and the data line 41 and the first power line L1 are both located in the third conductive layer. The layout of the sixth transistor M6 included in the data writing module 140, the seventh transistor included in the compensation module 180, and the eighth transistor M8 included in the second initialization module 190 can refer to the description in the relevant technology, which will not be repeated here.

[0237] Optionally, an embodiment of the present invention further provides a display device, which includes the display panel provided by any embodiment of the present invention. Therefore, the display device also has the beneficial effects described in any of the above embodiments. Fig.24 A structural schematic diagram of a display device provided in an embodiment of the present invention. In this embodiment, the display device 200 can be a mobile phone or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals and other products. The embodiment of the present invention does not make any special limitation on this.

[0238] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0239] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pixel circuit, characterized in that: include: Driving module, voltage control module and light emitting module; The driving module and the voltage control module are connected between a first power line and a first end of the light-emitting module, the second end of the light-emitting module is connected to a second power line, the driving module is used to drive the light-emitting module to emit light, and the voltage control module is used to control the voltage at one end of the driving module connected to the voltage control module when the displayed grayscale is less than a preset grayscale.

2. The pixel circuit according to claim 1, characterized in that: When the displayed grayscale is less than the preset grayscale, the transistor included in the voltage control module is in a subthreshold region; Preferably, the preset grayscale is 32 grayscales; Preferably, the preset grayscale is 16 grayscales; Preferably, when a black screen is displayed, the transistor included in the voltage control module is in a cut-off region; Preferably, the display grayscale corresponding to displaying a black picture is 0 grayscale.

3. The pixel circuit according to claim 2, characterized in that: When the displayed gray scale is greater than or equal to the preset gray scale, the transistor included in the voltage control module is in a linear region or a saturation region.

4. The pixel circuit according to claim 1, characterized in that: The control end of the voltage control module is connected to a first voltage signal line, and the first voltage signal line is used to transmit a first voltage; When the display grayscale is less than the preset grayscale, the absolute value of the difference between the first voltage and the voltage of one end of the driving module is less than the absolute value of the threshold voltage of the voltage control module, and the one end of the driving module is the end connected to the voltage control module; When the display grayscale is greater than or equal to the preset grayscale, the absolute value of the difference between the first voltage and the voltage at one end of the driving module is greater than or equal to the absolute value of the threshold voltage of the voltage control module, and the one end of the driving module is the end connected to the voltage control module; Preferably, the first voltage is a DC voltage.

5. The pixel circuit according to claim 4, characterized in that: The pixel circuit further includes a first light-emitting control module and a second light-emitting control module, wherein a control end of the first light-emitting control module is connected to a first light-emitting control signal line, and a control end of the second light-emitting control module is connected to a second light-emitting control signal line; The first end of the first light control module is connected to the first power line, the second end of the first light control module is connected to the first end of the driving module, the second end of the driving module is connected to the first end of the voltage control module, the second end of the voltage control module is connected to the first end of the second light control module, and the second end of the second light control module is connected to the first end of the light emitting module; Alternatively, the first end of the first light control module is connected to the first power line, the second end of the first light control module is connected to the first end of the driving module, the second end of the driving module is connected to the first end of the second light control module, the second end of the second light control module is connected to the first end of the voltage control module, and the second end of the voltage control module is connected to the first end of the light emitting module; Preferably, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the second transistor as the second end of the driving module, the second electrode of the second transistor is connected to the first electrode of the fourth transistor, the second electrode of the fourth transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, the gate of the second transistor is connected to the first voltage signal line, and the gate of the fourth transistor is connected to the second light-emitting control signal line; Alternatively, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the fourth transistor as the second end of the driving module, the second electrode of the fourth transistor is connected to the first electrode of the second transistor, the second electrode of the second transistor is connected to the first electrode of the light-emitting diode, and the second electrode of the light-emitting diode is connected to the second power line; Preferably, the first transistor is a P-type transistor or an N-type transistor, and the second transistor is a P-type transistor; Preferably, when the first transistor is a P-type transistor, the first light-emitting control signal line is multiplexed as the second light-emitting control signal line.

6. The pixel circuit according to claim 4, characterized in that: The pixel circuit further includes a first light-emitting control module and a second light-emitting control module, wherein a control end of the first light-emitting control module is connected to a first light-emitting control signal line, and a control end of the second light-emitting control module is connected to a second light-emitting control signal line; The first end of the first light control module is connected to the first power line, the second end of the first light control module is connected to the first end of the voltage control module, the second end of the voltage control module is connected to the first end of the driving module, the second end of the driving module is connected to the first end of the second light control module, and the second end of the second light control module is connected to the first end of the light emitting module; Alternatively, the first end of the voltage control module is connected to the first power line, the second end of the voltage control module is connected to the first end of the first light control module, the second end of the first light control module is connected to the first end of the driving module, the second end of the driving module is connected to the first end of the second light control module, and the second end of the second light control module is connected to the first end of the light module; Preferably, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the second electrode of the third transistor is connected to the first electrode of the second transistor, the first electrode of the first transistor is connected to the second electrode of the second transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the fourth transistor as the second end of the driving module, the second electrode of the fourth transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, the gate of the second transistor is connected to the first voltage signal line, and the gate of the fourth transistor is connected to the second light-emitting control signal line; Alternatively, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the second transistor is connected to the first power line, the second electrode of the second transistor is connected to the first electrode of the third transistor, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the fourth transistor as the second end of the driving module, the second electrode of the fourth transistor is connected to the first electrode of the light-emitting diode, and the second electrode of the light-emitting diode is connected to the second power line; Preferably, the first transistor is an N-type transistor, and the second transistor is an N-type transistor.

7. The pixel circuit according to claim 1, characterized in that: The first control end of the voltage control module is connected to the second light-emitting control signal line, and the second control end of the voltage control module is connected to the control end of the driving module; Preferably, the pixel circuit further comprises a first light-emitting control module, a control end of the first light-emitting control module is connected to a first light-emitting control signal line, a first end of the first light-emitting control module is connected to the first power line, a second end of the first light-emitting control module is connected to a first end of the driving module, a second end of the driving module is connected to a first end of the voltage control module, and a second end of the voltage control module is connected to a first end of the light-emitting module; Preferably, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the light-emitting module includes a light-emitting diode, the gate of the third transistor is connected to the first light-emitting control signal line, the first electrode of the third transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the third transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the second transistor as the second end of the driving module, the second electrode of the second transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, the first gate of the second transistor is connected to the second light-emitting control signal line, and the second gate of the second transistor is connected to the gate of the first transistor; Preferably, the first gate of the second transistor is a top gate, and the second gate of the second transistor is a bottom gate; Preferably, the channel type of the first transistor is the same as the channel type of the second transistor; Preferably, both the first transistor and the second transistor are P-type transistors; Preferably, the first light-emitting control signal line is multiplexed as the second light-emitting control signal line.

8. The pixel circuit according to claim 1, characterized in that: The first control end of the voltage control module is connected to the second light-emitting control signal line, and the second control end of the voltage control module is connected to the control end of the driving module; Preferably, the pixel circuit further comprises a first light-emitting control module, a control end of the first light-emitting control module is connected to a first light-emitting control signal line, a first end of the voltage control module is connected to the first power line, a second end of the voltage control module is connected to a first end of the driving module, a second end of the driving module is connected to a first end of the first light-emitting control module, and a second end of the first light-emitting control module is connected to a first end of the light-emitting module; Preferably, the driving module includes a first transistor, the voltage control module includes a second transistor, the first light-emitting control module includes a third transistor, the light-emitting module includes a light-emitting diode, the first gate of the second transistor is connected to the second light-emitting control signal line, the second gate of the second transistor is connected to the gate of the first transistor, the first electrode of the second transistor is connected to the first power line, the first electrode of the first transistor is connected to the second electrode of the second transistor as the first end of the driving module, the second electrode of the first transistor is connected to the first electrode of the third transistor as the second end of the driving module, the second electrode of the third transistor is connected to the first electrode of the light-emitting diode, and the second electrode of the light-emitting diode is connected to the second power line; Preferably, the first gate of the second transistor is a top gate, and the second gate of the second transistor is a bottom gate; Preferably, the channel type of the first transistor is the same as the channel type of the second transistor; Preferably, both the first transistor and the second transistor are N-type transistors; Preferably, the first light-emitting control signal line is multiplexed as the second light-emitting control signal line.

9. The pixel circuit according to claim 5, characterized in that: The first transistor is a P-type transistor, the pixel circuit further includes a first initialization module, a control end of the first initialization module is connected to a first scanning signal line, a first end of the first initialization module is connected to a second voltage signal line, and a second end of the first initialization module is connected to a first end of the light emitting module; Preferably, the first initialization module comprises a fifth transistor, a gate of the fifth transistor is connected to the first scanning signal line, a first electrode of the fifth transistor is connected to the second voltage signal line, and a second electrode of the fifth transistor is connected to the first electrode of the light emitting diode; Preferably, the pixel circuit further comprises a data writing module, the control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the first end of the driving module, and the data writing module is used to write the data voltage to the control end of the driving module; Preferably, the pixel circuit further comprises a compensation module, the control end of the compensation module is connected to the second scanning signal line, the compensation module is connected between the second end and the control end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module; Preferably, the pixel circuit further comprises a storage module, and the storage module is connected between the control end of the driving module and the first power line; Preferably, the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor and the gate of the seventh transistor are both connected to the second scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the first end of the driving module, the first electrode of the seventh transistor is connected to the second end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first power line and the control end of the driving module; Preferably, the pixel circuit further comprises a second initialization module, a control end of the second initialization module is connected to the third scanning signal line, a first end of the second initialization module is connected to the third voltage signal line, and a second end of the second initialization module is connected to the control end of the driving module; Preferably, the second initialization module comprises an eighth transistor, a gate of the eighth transistor is connected to the third scanning signal line, a first electrode of the eighth transistor is connected to the third voltage signal line, and a second electrode of the eighth transistor is connected to the control end of the driving module; Preferably, the second scanning signal line or the third scanning signal line is multiplexed as the first scanning signal line.

10. The pixel circuit according to claim 5 or 6, characterized in that: The first transistor is an N-type transistor, and the pixel circuit further includes a first initialization module, wherein a control end of the first initialization module is connected to a first scanning signal line, a first end of the first initialization module is connected to a second voltage signal line, and a second end of the first initialization module is connected to a first end of the light emitting module; Preferably, the first initialization module comprises a fifth transistor, a gate of the fifth transistor is connected to the first scanning signal line, a first electrode of the fifth transistor is connected to the second voltage signal line, and a second electrode of the fifth transistor is connected to the first electrode of the light emitting diode; Preferably, the pixel circuit further comprises a data writing module, the control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the second end of the driving module, and the data writing module is used to write the data voltage to the control end of the driving module; Preferably, the pixel circuit further comprises a compensation module, a control end of the compensation module is connected to the first scanning signal line, the compensation module is connected between the first end and the control end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module; Preferably, the pixel circuit further comprises a storage module, and the storage module is connected between the control end of the driving module and the first end of the light emitting module; Preferably, the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor is connected to the second scanning signal line, the gate of the seventh transistor is connected to the first scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the second end of the driving module, the first electrode of the seventh transistor is connected to the first end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first end of the light-emitting module and the control end of the driving module.

11. The pixel circuit according to claim 1, characterized in that: The voltage control module includes a first sub-control module and a second sub-control module, the control end of the first sub-control module is connected to the first light-emitting control signal line, the control end of the second sub-control module is connected to the second light-emitting control signal line, the first end of the first sub-control module is connected to the first power line, the second end of the first sub-control module is connected to the first end of the driving module, the second end of the driving module is connected to the first end of the second sub-control module, and the second end of the second sub-control module is connected to the first end of the light-emitting module; Wherein, when the displayed grayscale is less than the preset grayscale, the transistors included in the first sub-control module and / or the second sub-control module are in a sub-threshold region; Preferably, the driving module includes a first transistor, the first sub-control module includes a ninth transistor, the second sub-control module includes a tenth transistor, the light-emitting module includes a light-emitting diode, the gate of the ninth transistor is connected to the first light-emitting control signal line, the first electrode of the ninth transistor is connected to the first power line, the second electrode of the ninth transistor is connected to the first electrode of the first transistor, the second electrode of the first transistor is connected to the first electrode of the tenth transistor, the second electrode of the tenth transistor is connected to the first electrode of the light-emitting diode, the second electrode of the light-emitting diode is connected to the second power line, and the gate of the tenth transistor is connected to the second light-emitting control signal line.

12. The pixel circuit according to claim 11, characterized in that: The pixel circuit further includes a first initialization module, wherein a control end of the first initialization module is connected to a first scanning signal line, a first end of the first initialization module is connected to a second voltage signal line, and a second end of the first initialization module is connected to a first end of the light emitting module; Preferably, the first initialization module comprises a fifth transistor, a gate of the fifth transistor is connected to the first scanning signal line, a first electrode of the fifth transistor is connected to the second voltage signal line, and a second electrode of the fifth transistor is connected to the first electrode of the light emitting diode; Preferably, the absolute value of the effective level of the first light emitting control signal transmitted on the first light emitting control signal line is smaller than the absolute value of the effective level of the first scanning signal transmitted on the first scanning signal line; and / or, An absolute value of an effective level of a second light emitting control signal transmitted on the second light emitting control signal line is smaller than an absolute value of an effective level of a first scanning signal transmitted on the first scanning signal line; Preferably, the ninth transistor and the tenth transistor have the same channel type; Preferably, the first light-emitting control signal line is multiplexed as the second light-emitting control signal line; Preferably, the pixel circuit further comprises a data writing module, the control end of the data writing module is connected to the second scanning signal line, the data writing module is connected to the driving module, and the data writing module is used to write the data voltage to the control end of the driving module; Preferably, the pixel circuit further comprises a compensation module, the control end of the compensation module is connected to the second scanning signal line, the compensation module is connected between the second end and the control end of the driving module, or the control end of the compensation module is connected to the first scanning signal line, the compensation module is connected between the first end and the control end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module; Preferably, the absolute value of the effective level of the second scanning signal transmitted on the second scanning signal line is the same as the absolute value of the effective level of the second light-emitting control signal transmitted on the second light-emitting control signal line, or the absolute value of the effective level of the second scanning signal is the same as the absolute value of the effective level of the first light-emitting control signal transmitted on the first light-emitting control signal line; Preferably, the pixel circuit further comprises a storage module, and the storage module is connected to the control end of the driving module.

13. The pixel circuit according to claim 12, characterized in that: The first transistor is a P-type transistor, the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor and the gate of the seventh transistor are both connected to the second scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the first end of the driving module, the first electrode of the seventh transistor is connected to the second end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first power line and the control end of the driving module; Preferably, the pixel circuit further comprises a second initialization module, a control end of the second initialization module is connected to the third scanning signal line, a first end of the second initialization module is connected to the third voltage signal line, and a second end of the second initialization module is connected to the control end of the driving module; Preferably, the second initialization module comprises an eighth transistor, a gate of the eighth transistor is connected to the third scanning signal line, a first electrode of the eighth transistor is connected to the third voltage signal line, and a second electrode of the eighth transistor is connected to the control end of the driving module; Preferably, the third scanning signal line is multiplexed as the first scanning signal line.

14. The pixel circuit according to claim 12, characterized in that: The first transistor is an N-type transistor; the data writing module includes a sixth transistor, the compensation module includes a seventh transistor, the storage module includes a storage capacitor, the gate of the sixth transistor is connected to the second scanning signal line, the gate of the seventh transistor is connected to the first scanning signal line, the first electrode of the sixth transistor is connected to the data line, the second electrode of the sixth transistor is connected to the second end of the driving module, the first electrode of the seventh transistor is connected to the first end of the driving module, the second electrode of the seventh transistor is connected to the control end of the driving module, and the storage capacitor is connected between the first end of the light-emitting module and the control end of the driving module.

15. A method for driving a pixel circuit, characterized in that: The pixel circuit includes a driving module, a voltage control module and a light emitting module; The driving method of the pixel circuit comprises: In the light-emitting stage, the driving module is controlled to drive the light-emitting module to emit light; wherein, when the displayed grayscale is less than the preset grayscale, the voltage control module is controlled to control the voltage at one end connecting the driving module and the voltage control module.

16. The driving method of the pixel circuit according to claim 15, characterized in that: The voltage control module includes a transistor, and the step of controlling the voltage control module to control the voltage of a terminal connected between the driving module and the voltage control module includes: Control the transistor in the voltage control module to be in a subthreshold region in response to the signal at the control end of the voltage control module; Preferably, the step of controlling the voltage control module to control the voltage at one end of the driving module connected to the voltage control module comprises: When the displayed grayscale is greater than grayscale 0 and less than the preset grayscale, controlling the transistor in the voltage control module to respond to the signal at the control end of the voltage control module in a subthreshold region; When the display gray scale is gray scale 0, controlling the transistor in the voltage control module to be in a cut-off region in response to the signal at the control end of the voltage control module; Preferably, the driving method of the pixel circuit further includes: In the non-light-emitting stage, the transistor in the voltage control module is controlled to be in a cut-off region in response to a signal from a control terminal of the voltage control module.

17. A display panel, characterized in that: include: substrate; An active layer, located on one side of the substrate; A plurality of conductive layers stacked on a side of the active layer away from the substrate; At least one pixel circuit, the pixel circuit comprising a driving module, a voltage control module and a light emitting module, wherein the driving module comprises a first transistor, the voltage control module comprises a second transistor, and the light emitting module comprises a light emitting diode; The multilayer conductive layer includes a first conductive layer, the gate of the first transistor and the gate of the second transistor are both located in the first conductive layer, and the orthographic projection of the gate of the second transistor on the substrate is located between the orthographic projection of the gate of the first transistor on the substrate and the orthographic projection of the first pole of the light-emitting diode on the substrate.

18. The display panel according to claim 17, characterized in that: The active layer comprises a first active layer, the channel region of the first transistor is located in the first active layer, and the orthographic projection of the gate of the first transistor on the substrate at least partially covers the orthographic projection of the channel region of the first transistor on the substrate; Preferably, the pixel circuit further includes a first light-emitting control module and a second light-emitting control module, the first light-emitting control module includes a third transistor, the second light-emitting control module includes a fourth transistor, the active layer further includes a second active layer and a third active layer, the channel region of the third transistor is located in the second active layer, the channel region of the fourth transistor is located in the third active layer, the orthographic projection of the gate of the third transistor on the substrate at least partially covers the orthographic projection of the channel region of the third transistor on the substrate, and the orthographic projection of the gate of the fourth transistor on the substrate at least partially covers the orthographic projection of the channel region of the fourth transistor on the substrate; Preferably, the first active layer, the second active layer and the third active layer are in the same layer and connected; Preferably, the second active layer extends along the second direction, the third active layer extends along the second direction, and the second active layer and the third active layer are located on different sides of the first active layer; Preferably, the orthographic projection of the gate of the second transistor on the substrate is located on a side of the orthographic projection of the gate of the fourth transistor on the substrate away from the orthographic projection of the gate of the first transistor on the substrate; Preferably, the display panel further comprises a first voltage signal line, the first voltage signal line is located in the first conductive layer, and an orthographic projection of the first voltage signal line on the substrate at least partially covers an orthographic projection of a channel region of the second transistor on the substrate; Preferably, the channel region of the second transistor is located in the third active layer; Preferably, the orthographic projection of the first voltage signal line on the substrate does not overlap with the orthographic projection of the second active layer on the substrate; Preferably, the first voltage signal line extends along a first direction, and the first direction intersects with the second direction.

19. The display panel according to claim 18, characterized in that: The display panel further includes a first light emitting control signal line, wherein the first light emitting control signal line is arranged to cross the second active layer and the third active layer; Preferably, the orthographic projection of the first light-emitting control signal line on the substrate is located between the orthographic projection of the first voltage signal line on the substrate and the orthographic projection of the gate of the first transistor on the substrate; Preferably, the first light emitting control signal line extends along the first direction; Preferably, the pixel circuit further includes a first initialization module, the first initialization module includes a fifth transistor, the channel region of the fifth transistor is located in the third active layer, the display panel further includes a first scanning signal line, the orthographic projection of the first scanning signal line on the substrate at least partially covers the orthographic projection of the channel region of the fifth transistor on the substrate; Preferably, the display panel further comprises a second voltage signal line and a connecting line, the multi-layer conductive layer further comprises a second conductive layer and a third conductive layer, the second voltage signal line is located in the second conductive layer, the connecting line is located in the third conductive layer, the second voltage signal line is connected to one end of the connecting line through a via hole, and the third active layer is connected to the other end of the connecting line through a via hole; Preferably, the second voltage signal line extends along the first direction, and the connecting line extends along the second direction; Preferably, the orthographic projection of the first scanning signal line on the substrate is located between the orthographic projection of the first voltage signal line on the substrate and the orthographic projection of the second voltage signal line on the substrate, and the orthographic projection of the first scanning signal line on the substrate is located on a side of the orthographic projection of the first voltage signal line on the substrate away from the orthographic projection of the gate of the first transistor on the substrate.

20. A display device, characterized in that: A display panel comprising any one of claims 17 to 19.

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