Patent ID: 12260799

DETAILED DESCRIPTION

In order to further illustrate the pixel circuit, the driving method thereof, and the display device provided by the embodiments of the present disclosure, the following detailed description is given with reference to the accompanying drawings.

In the pixel circuit included in the AMOLED display screen, after the driving transistor operates at a certain bias voltage for a period of time, its characteristics will shift, that is, hysteresis, which will cause that when the screen is switched to another screen after displaying a picture for a period of time, deviation will occur in brightness, resulting in short-term afterimages and slow response time and other defects, the user experience becomes worse.

Referring toFIG.1,FIG.2,FIG.5,FIG.8andFIG.9, an embodiment of the present disclosure provides a pixel circuit, including: a driving circuit11, a data writing-in circuit41and a reset circuit20;

The data writing-in circuit41is respectively coupled to a first scan line S1, a data line D1and a second end of the driving circuit11, and is configured to control to connect the data line D1and the second end of the driving circuit11under the control of a first scan signal provided by the first scan line S1;

The reset circuit20is respectively coupled to a third scan line S3, a reset voltage line DR and the second end of the driving circuit11, and is configured to control to connect a reset voltage line DR and the second end of the driving circuit11(i.e., a second node N2) under the control of a third scan signal provided by the third scan line S3: or, the reset circuit20is coupled to the third scan line S3, the reset voltage line DR and a first end of the driving circuit11(i.e., a third node N3), is configured to control to connect the reset voltage line DR and the first end of the driving circuit11under the control of the third scan signal:

The driving circuit11is configured to control to connect the first end of the driving circuit11and the second end of the driving circuit11under the control of a potential of a control end of the driving circuit.

Exemplarily, the first scan line S1is used to write the first scan signal, and the data line D1is used to write a data signal, and the data signal is used for normal display. The third scan line S3is used to write the third scan signal. The reset voltage line DR is used to provide a reset voltage.

Exemplarily, the reset signal provided by the reset voltage line DR may be a DC signal or an AC signal. It needs to be ensured that when the reset circuit20implements the reset function, the reset voltage of the reset signal provided by the reset voltage line DR is a high voltage.

Exemplarily, the reset voltage includes a power supply voltage VDD. In this case, the reset voltage line DR may be coupled to a power supply line for providing the power supply voltage VDD, or the power supply line may be directly multiplexed as the reset voltage line DR.

Exemplarily, when the reset circuit implements the reset function, the reset voltage has a same potential as the high-level of a first light-emitting control signal provided by a first light-emitting control line EM1. Exemplarily, the reset voltage line DR is coupled to the first light-emitting control line EM1: or, the first light-emitting control line EM1is multiplexed as the reset voltage line DR.

Exemplarily, the pixel circuit is applied to a display device, and the display device further includes a gate driving circuit, the gate driving circuit is connected to a high-level signal line, and the high-level signal line is used to provide a high-level signal VGH. The reset voltage line DR is coupled to the high-level signal line, and the reset voltage has the same voltage value as the high-level signal VGH. Alternatively, the high-level signal line is multiplexed as the reset voltage line DR.

Exemplarily, the reset voltage includes a first initialization voltage. In this case, the reset voltage line DR can be set to be coupled to a first initialization voltage line Vinit1for providing a first initialization voltage, or the first initialization voltage line Vinit1is directly multiplexed as the reset voltage line DR.

Exemplarily, the reset voltage is provided to the driving circuit11, so as to provide a larger Vgs to the driving circuit11.

Exemplarily, when the reset voltage line DR is coupled to the second end of the driving circuit11(i.e., the second node N2), the difference between the reset voltage and the power supply voltage VDD is less than or equal to 3.5 V.

Exemplarily, when the reset voltage line DR is coupled to the first end of the driving circuit11(i.e., the third node N3), the difference between the reset voltage and the first initialization voltage is less than or equal to 2V.

Exemplarily, when the first scan signal is at an active level, the data writing-in circuit41is configured to connect the data line D1and the second end of the driving circuit11under the control of the first scan signal provided by the first scan line S1. When the first scan signal is at an inactive level, the data writing-in circuit41is configured to disconnect the data line D1from the second end of the driving circuit11under the control of the first scan signal provided by the first scan line S1.

Exemplarily, when the third scan signal is at an active level, the reset circuit20is configured to connect the reset voltage line DR and the second end or the first end of the driving circuit11under the control of the third scan signal. When the third scan signal is at an inactive level, the reset circuit20is configured to disconnect the reset voltage line DR from the second end or the first end of the driving circuit11under the control of the third scan signal.

Exemplarily, one display period in which the pixel circuit operates includes: a bias voltage compensation phase P2and a writing-in compensation phase P3.

In the bias voltage compensation phase P2, under the control of the third scan signal, the reset circuit20controls to connect the reset voltage line DR and the second end of the driving circuit11: or under the control of the third scan signal, the reset circuit20controls to connect the reset voltage line DR and the first end of the driving circuit11, so as to write the reset voltage to the first end or the second end of the driving circuit11:

In the writing-in compensation phase P3, under the control of the first scan signal, the data writing-in circuit41controls to connect the data line D1and the second end of the driving circuit11, and writes a data signal to the second end of the driving circuit11.

According to the specific structure of the above pixel circuit, in the pixel circuit provided by the embodiment of the present disclosure, by setting the reset circuit20, a reset voltage can be applied to the first end or the second end of the driving circuit11in the bias voltage compensation phase P2, so that before the data signal is written, the first end or the second end of the driving circuit11is reset to eliminate the influence of the previous frame of the picture on the driving circuit11, and to ensure that the state of the driving circuit is the same when the next frame of picture is written. Therefore, the characteristics of the compensation driving circuit11will be shifted after a certain bias voltage is operated for a period of time, so as to improve the short-term afterimage and slow response time and other defects. In addition, when driving at low frequency, the difference in brightness caused by the characteristic shift of the driving circuit11in the long-term light-emitting period can be compensated, the Flicker phenomenon of the screen can be improved, the screen quality can be optimized, and the user experience can be improved.

In addition, when the pixel circuit provided by the embodiment of the present disclosure is applied to a display device, a specific bias voltage compensation can be implemented for the driving circuit11in each pixel circuit in the display device, which has a good compensation effect.

In addition, since the reset voltage provided by the reset voltage line DR can be adjusted independently, an appropriate bias voltage can be provided to each pixel circuit in the display device as required.

As shown inFIG.3, in some embodiments, the pixel circuit further includes: a compensation control circuit13, a first initialization circuit14and a third initialization circuit15:

The compensation control circuit13is respectively electrically connected to the second scan line S2, the control end (i.e. the first node N1) of the driving circuit11and the first end (i.e. the third node N3) of the driving circuit11, is configured to control to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal provided by the second scan line S2:

The first initialization circuit14is respectively coupled to the second scan line S2, the first initialization voltage line Vinit1and the connection node N0, and is configured to control to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal:

The third initialization circuit15is respectively coupled to the second light-emitting control line E2, the control end of the driving circuit11and the connection node N0, and is configured to control to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal provided by the second light-emitting control line E2.

Exemplarily, the second scan line S2is configured to write the second scan signal. The display device includes a plurality of pixel circuits arranged in an array, the pixel circuits located in the same row are connected to the same first scan line S1, and the pixel circuits located in the same row are connected to the same second scan line S2. The edge of the display device is provided with a plurality of scanning shift register units (GOAs), and the plurality of scanning shift register units are in one-to-one correspondence with the plurality of second scanning lines S2, and the second scanning lines S2are coupled to the corresponding shift register units to receive the second scan signal provided by the corresponding shift register unit. Exemplarily, the first scan line S1is coupled to a shift register unit correspondingly coupled to the next row of pixel circuits adjacent to the first scan line S1. Exemplarily, the first scan line S1is coupled to the shift register unit correspondingly coupled to the previous row of pixel circuits adjacent to the first scan line S1. This is beneficial to reduce the layout space of the gate driving circuit11around the display device, and is beneficial to the narrowing of the frame of the display device.

Exemplarily, the first initialization voltage line Vinit1is configured to write the first initialization voltage.

As shown inFIG.8, exemplarily, in the bias voltage compensation phase P2, the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal: the third initialization circuit15controls to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, and resets the control end of the driving circuit11.

As shown inFIG.8, exemplarily, in the bias voltage compensation phase P2, the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal, to realize the reset of the first end of the driving circuit11.

Exemplarily, in the writing-in compensation phase P3, the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal provided by the second scan line S2, the data writing-in circuit41controls to connect the data line D1and the second end of the driving circuit11under the control of the first scan signal, and writes the data signal to the second end of the driving circuit11, so as to realize the threshold voltage compensation of the driving circuit11. After the writing-in compensation phase P3, the potential of the control end (e.g., the gate electrode of the driving transistor) of the driving circuit11becomes Vdata+Vth, wherein Vdata is the data voltage corresponding to the data signal, and Vth is the threshold voltage of the driving transistor included in the driving circuit11.

Exemplarily, in the writing-in compensation phase P3, the third initialization circuit15controls to disconnect the control end of the driving circuit11from the connection node N0under the control of the second light-emitting control signal.

In the pixel circuit provided by the above embodiment, the compensation control circuit13and the first initialization circuit are both coupled to the second scan line S2, which can reduce the number of signal lines laid out in the display device and reduce the difficulty of the layout of the gate driving circuit11, which is beneficial to the narrowing of the frame of the display device.

At the same time, the pixel circuit includes the third initialization circuit15, which can disconnect the first initialization voltage line Vinit1from the control end of the driving circuit11during the writing-in compensation period P3, so as to ensure that a normal threshold compensation function can be implemented for the driving circuit11in the writing-in compensation period P3.

As shown inFIG.5, in some embodiments, the pixel circuit further includes: a compensation control circuit13, a first initialization circuit14and a third initialization circuit15:

The compensation control circuit13is electrically connected to the second scan line S2, the control end of the driving circuit11and the first end of the driving circuit11, respectively, is configured to control to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal provided by the second scan line S2:

The first initialization circuit14is respectively coupled to the second scan line S2, the first initialization voltage line Vinit1and the connection node N0, and is configured to control to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal:

The third initialization circuit15is respectively coupled to the second light-emitting control line E2, and the first end of the driving circuit11and the connection node N0, and is configured to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal provided by the second light-emitting control line E2.

As shown inFIG.8, exemplarily, in the bias voltage compensation phase P2, the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; the third initialization circuit15controls to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, and resets the first end of the driving circuit11. Exemplarily, in the bias voltage compensation phase P2, the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal, to reset the control end of the driving circuit11.

Exemplarily, in the writing-in compensation phase P3, the third initialization circuit15controls to disconnect the first end of the driving circuit11from the connection node N0under the control of the second light-emitting control signal.

In the pixel circuit provided in the above-mentioned embodiment, the compensation control circuit13and the first initialization circuit14are set to be coupled to the second scan line S2, which can reduce the number of signal lines laid out in the display device and reduce the difficulty of the layout of the gate driving circuit11, which is beneficial to the narrowing of the frame of the display device.

At the same time, the pixel circuit includes the third initialization circuit15, which can disconnect the first initialization voltage line Vinit1from the first end of the driving circuit11during the writing-in compensation period P3, so as to ensure that a normal threshold compensation function is implemented for the driving circuit11in the writing-in compensation period.

In addition, the third initialization circuit15is coupled to the second light-emitting control line E2, and the first end of the driving circuit11and the connection node N0, which reduces the leakage path of the first node N1, which is beneficial to protect the potential of the first node N1at low frequencies.

As shown inFIG.2, in some embodiments, the pixel circuit further includes: a compensation control circuit13, a first initialization circuit14and a third initialization circuit15:

The compensation control circuit13is respectively electrically connected to the second scan line S2, the control end (i.e. the first node N1) of the driving circuit11and the first end (i.e. the third node N3) of the driving circuit11, is configured to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal provided by the second scan line S2:

The first initialization circuit14is respectively coupled to the second scan line S2, the first initialization voltage line Vinit1and the connection node N0, and is configured to control to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal:

The third initialization circuit15is respectively coupled to the second light-emitting control line E2, the control end of the driving circuit11and the connection node N0, and is configured to control to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal provided by the second light-emitting control line E2.

As shown inFIG.9, exemplarily, in the initialization phase P1before the bias voltage compensation phase P2: the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal, the third initialization circuit15controls to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, to realize the reset of the control end of the driving circuit11: the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal, to realize the reset of the first end of the driving circuit11. In the bias voltage compensation phase P2: the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; the third initialization circuit15controls to disconnect the control end of the driving circuit11from to the connection node N0under the control of the second light-emitting control signal: the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal.

In the pixel circuit provided by the above embodiment, the compensation control circuit13and the first initialization circuit are both coupled to the second scan line S2, which can reduce the number of signal lines laid out in the display device and reduce the difficulty of the layout of the gate driving circuit11, which is beneficial to the narrowing of the frame of the display device.

At the same time, the pixel circuit includes the third initialization circuit15, which can disconnect the first initialization voltage line Vinit1from the control end of the driving circuit11during the writing-in compensation period P3, so as to ensure that a normal threshold compensation function is implemented for the driving circuit11in the writing-in compensation period P3.

As shown inFIG.5, in some embodiments, the pixel circuit further includes: a compensation control circuit13, a first initialization circuit14and a third initialization circuit15:

The compensation control circuit13is electrically connected to the second scan line S2, the control end of the driving circuit11and the first end of the driving circuit11, respectively, is configured to control to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan line signal provided in the second scan line S2.

The first initialization circuit14is respectively coupled to the second scan line S2, the first initialization voltage line Vinit1and the connection node N0, and is configured to control to connect first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal:

The third initialization circuit15is respectively coupled to the second light-emitting control line E2, and the first end of the driving circuit11and the connection node N0, and is configured to control to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal provided by the second light-emitting control line E2.

As shown inFIG.9, exemplarily, in the initialization phase P1before the bias voltage compensation phase P2: the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal, the third initialization circuit15controls to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, so as to realize the reset of the first end of the driving circuit1. The compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal, to realize the reset of the control end of the driving circuit11. In the bias voltage compensation phase P2: the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal, the third initialization circuit15controls to disconnect the first end of the driving circuit11from the connection node N0under the second light-emitting control signal: the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal.

In the pixel circuit provided by the above embodiment, the compensation control circuit13and the first initialization circuit are both coupled to the second scan line S2, which can reduce the number of signal lines laid out in the display device and reduce the difficulty of the layout of the gate driving circuit11, which is beneficial to the narrowing of the frame of the display device.

At the same time, the pixel circuit includes the third initialization circuit15, which can disconnect the first initialization voltage line Vinit1from the first end of the driving circuit11during the writing-in compensation period P3, so as to ensure that a normal threshold compensation function is implemented for the driving circuit11in the writing-in compensation period.

As shown inFIG.2andFIG.5, in some embodiments, the pixel circuit further includes: a light-emitting control circuit31, an energy storage circuit42and a light-emitting element O1:

The light-emitting control circuit31is respectively coupled to the first light-emitting control line E1, the first end of the driving circuit11and the light-emitting element O1, and is configured to control to connect the first end of the driving circuit11and the light-emitting element O1under the control of the first light-emitting control signal provided by the first light-emitting control line E1;

The energy storage circuit42is respectively coupled to the control end of the driving circuit11and the first voltage line.

As shown inFIG.2andFIG.5, in some embodiments, the light-emitting control circuit31is further coupled to the second light-emitting control line E2, the first voltage line and the second end of the driving circuit11, respectively, is configured to control to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal provided by the second light-emitting control line E2.

Exemplarily, the first voltage line includes a positive power line capable of transmitting a positive power signal VDD. Whether the first voltage provided by the first voltage line is written into the second end of the driving circuit11is controlled by the light-emitting control signal.

As shown inFIG.8, exemplarily, in the bias voltage compensation phase P2, the light-emitting control circuit31controls to connect the first voltage line and the second terminal of the driving circuit11under the control of the second light-emitting control signal, so as to realize the reset of the second end of the driving circuit11.

As shown inFIG.9, exemplarily, an initialization phase P1is further included before the bias voltage compensation phase P2. In the initialization phase P1, the light-emitting control circuit31controls to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal, to realize the reset of the second end of the driving circuit11. In the bias voltage compensation phase P2, the light-emitting control circuit31controls to disconnect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal.

As shown inFIG.8andFIG.9, exemplarily, in the light-emitting phase P4, the light-emitting control circuit31controls to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal line, the light-emitting control circuit31also controls to connect the first end of the driving circuit11and the light-emitting element O1under the control of the first light-emitting control signal provided by the first light-emitting control line E1.

As shown inFIG.2andFIG.5, in some embodiments, the pixel circuit further includes: a second initialization circuit32:

The second initialization circuit32is respectively coupled to the first scan line S1, the second initialization voltage line Vinit2and the light-emitting element O1, and is used to control to connect the second initialization voltage line Vinit2and the light-emitting element O1under the control of the first scan signal.

Exemplarily, the second initialization voltage line Vinit2is used to provide a second initialization voltage.

The second initialization circuit32can reset the first electrode of the light-emitting element O1under the control of the second scan signal.

It should be noted that the first electrode of the light-emitting element O1includes an anode, and the second electrode (i.e., the cathode) of the light-emitting element O1receives a negative power supply signal VSS.

As shown inFIG.3,FIG.4,FIG.6andFIG.7, in some embodiments, the compensation control circuit13includes a first transistor T1, the first initialization circuit14includes a second transistor T2, and the driving circuit11includes a third transistor T3(i.e., a driving transistor), the third initialization circuit15includes a ninth transistor T9: a gate electrode of the first transistor T1is coupled to the second scan line S2, and a first electrode of the first transistor T1is coupled to a second electrode of the third transistor T3, a second electrode of the first transistor T1is coupled to a gate electrode of the third transistor T3: a gate electrode of the second transistor T2is coupled to the second scan line S2, a first electrode of the second transistor T2is coupled to the first initialization voltage line Vinit1, and a second electrode of the second transistor T2is coupled to the connection node N0; a gate electrode of the ninth transistor T9is coupled to the second light-emitting control line E2, a first electrode of the ninth transistor T9is coupled to the connection node N0, and a second electrode of the ninth transistor T9is coupled to a gate electrode of the third transistor T3:

The data writing-in circuit41includes a fourth transistor T4, the reset circuit20includes an eighth transistor T8; a gate electrode of the fourth transistor T4is coupled to the first scan line S1, and a first electrode of the fourth transistor T4is coupled to the data line D1, a second electrode of the fourth transistor T4is coupled to a first electrode of the third transistor T3, and a gate electrode of the eighth transistor T8is connected to the third scan line S3, a first electrode of the eighth transistor T8is coupled to the reset voltage line DR, a second electrode of the eighth transistor T8is coupled to a first electrode of the third transistor T3or a second electrodes of the third transistor T3;

The light-emitting control circuit31includes a fifth transistor T5and a sixth transistor T6; a gate electrode of the fifth transistor T5is coupled to the second light-emitting control line E2, and a first electrode of the fifth transistor T5is coupled to the first voltage line, a second electrode of the fifth transistor T5is coupled to a first electrode of the third transistor T3, and a gate electrode of the sixth transistor T6is coupled to the first light-emitting control line E1, a first electrode of the sixth transistor T6is coupled to a second electrode of the third transistor T3, and a second electrode of the sixth transistor T6is coupled to the light-emitting element O1:

The energy storage circuit includes a storage capacitor C, a first electrode plate of the storage capacitor C is coupled to the first voltage line, and a second electrode plate of the storage capacitor C is coupled to the gate electrode of the third transistor.

The second initialization circuit32includes a seventh transistor T7, a gate electrode of the seventh transistor T7is coupled to the first scan line S1, and a first electrode of the seventh transistor T7is coupled to the second initialization voltage line Vinit2, and a second electrode of the seventh transistor T7is coupled to the light-emitting element O1.

As shown inFIG.8, exemplarily, each display period of the pixel circuit sequentially includes: a bias voltage compensation phase P2, a writing-in compensation phase P3, a buffer phase h0and a light-emitting phase P4.

In the bias voltage compensation phase P2, T1, T2, T5, T8and T9are turned on, and N1, N2and N3are reset. T3is turned on and a current passing through T3, thereby eliminating the influence of the previous frame on T3, T4, T6and T7are turned off.

In the writing-in compensation phase P3, T1, T2, T4and T7are turned on, and T5, T6, T8and T9are turned off, so as to realize the threshold voltage compensation of T3and reset the anode of the light-emitting element O1.

In the buffer phase h0, T1, T2, T5, T8, and T9are turned off, T4and T7are changed from on to off, T6is changed from off to on, and the potential of the N1is maintained at a voltage after the writing-in compensation period.

In the light-emitting phase P4, T3, T5, T6and T9are turned on, T1, T2, T4, T7and T8are turned off, and the light-emitting element O1emits light.

As shown inFIG.9, exemplarily, each display period of the pixel circuit sequentially includes: an initialization phase P1, a bias voltage compensation phase P2, a first buffer phase h1, a writing-in compensation phase P3, a second buffer phase h2and a light-emitting phase P4.

In the initialization phase P1, T1, T2, T5and T9are turned on to reset N1, N2and N3. T3is turned on and a current pass through T3, thereby eliminating the influence of the previous frame on T3, T4, T6, T7and T8are turned off.

In the bias voltage compensation phase P2, T1, T2and T8are turned on to reset N2, or reset N1and N3, T4, T5, T6, T7and T9are turned off.

In the first buffer phase h1, T1and T2are turned on, and T4, T5, T6, T7, T8and T9are turned off.

In the writing-in compensation phase P3, T1, T2, T4and T7are turned on, and T5, T6, T8and T9are turned off, so as to realize the threshold voltage compensation of T3and reset the anode of the light-emitting element O1.

In the second buffer phase h2, T1, T2, T5, T8and T9are turned off, T4and T7are changed from on to off, T6is changed from off to on, and the potential of the N1point is maintained at a voltage after the writing-in compensation period.

In the light-emitting phase P4, T3, T5, T6and T9are turned on, T1, T2, T4, T7and T8are turned off, and the light-emitting element O1emits light.

As shown inFIG.3,FIG.4,FIG.6andFIG.7, in some embodiments, the compensation control circuit13includes a first transistor T1, the first initialization circuit14includes a second transistor T2, and the driving circuit11includes a third transistor T3, the third initialization circuit15includes a ninth transistor T9: the gate electrode of the first transistor T1is coupled to the second scan line S2, and the first electrode of the first transistor T1is coupled to the second electrode of the third transistor T3, the second electrode of the first transistor T1is coupled to the gate electrode of the third transistor T3: the gate electrode of the second transistor T2is coupled to the second scan lines S2, the first electrode of the second transistor T2is coupled to the first initialization voltage line Vinit1, and the second electrode of the second transistor T2is coupled to the connection node N0; the gate electrode of the ninth transistor T9is coupled to the second light-emitting control line E2, the first electrode of the ninth transistor T9is coupled to the connection node N0, and the second electrode of the ninth transistor T9is coupled to the second electrode of the third transistor T3:

The data writing-in circuit41includes a fourth transistor T4, the reset circuit20includes an eighth transistor T8: the gate electrode of the fourth transistor T4is coupled to the first scan line S1, and the first electrode of the fourth transistor T4is coupled to the data line D1, the second electrode of the fourth transistor T4is coupled to the first electrode of the third transistor T3, and the gate electrode of the eighth transistor T8is coupled to the third scan line S3, the first electrode of the eighth transistor T8is coupled to the reset voltage line DR, the second electrode of the eighth transistor T8is coupled to the first electrode of the third transistor T3or the second electrodes of the third transistor T3:

The light-emitting control circuit31includes a fifth transistor T5and a sixth transistor T6; the gate electrode of the fifth transistor T5is coupled to the second light-emitting control line E2, and the first electrode of the fifth transistor T5is connected to the first voltage line, the second electrode of the fifth transistor T5is coupled to the first electrode of the third transistor T3, and the gate electrode of the sixth transistor T6is coupled to the first light-emitting control line E1, the first electrode of the sixth transistor T6is coupled to the second electrode of the third transistor T3, and the second electrode of the sixth transistor T6is coupled to the light-emitting element O1:

The second initialization circuit32includes a seventh transistor T7, the gate electrode of the seventh transistor T7is coupled to the first scan line S1, and the first electrode of the seventh transistor T7is coupled to the second initialization voltage line Vinit2, and the second electrode of the seventh transistor T7is coupled to the light-emitting element O1:

The energy storage circuit includes a storage capacitor C, the first plate electrode of the storage capacitor C is coupled to the first voltage line, and the second electrode plate of the storage capacitor C is coupled to the gate electrode of the third transistor.

As shown inFIG.8, exemplarily, each display period of the pixel circuit sequentially includes: a bias voltage compensation phase P2, a writing-in compensation phase P3, a buffer phase and a light-emitting phase P4.

In the bias voltage compensation phase P2, T1, T2, T5, T8and T9are turned on, and N1, N2and N3are reset. T3is turned on and a current passes through T3, thereby eliminating the influence of the previous frame on T3. T4, T6and T7are turned off.

In the writing-in compensation phase P3, T1, T2, T4and T7are turned on, and T5, T6, T8and T9are turned off, so as to realize the threshold voltage compensation of T3and reset the anode of the light-emitting element O1.

In the buffering phase, T1, T2, T5, T8and T9are turned off, T4and T7are changed from on to off, T6is changed from off to on, and the potential of the N1point is maintained at the voltage after the writing-in compensation period.

In the light-emitting phase P4, T3, T5, T6and T9are turned on, T1, T2, T4, T7and T8are turned off, and the light-emitting element O1emits light.

As shown inFIG.9, exemplarily, each display period of the pixel circuit sequentially includes: an initialization phase P1, a bias voltage compensation phase P2, a first buffer phase h1, a writing-in compensation phase P3, and a second buffer phase h2and a light-emitting phase P4.

In the initialization phase P1, T1, T2, T5and T9are turned on to reset N1, N2and N3. T3is turned on and the current passes through T3, thereby eliminating the influence of the previous frame on T3. T4, T6, T7and T8are turned off.

In the bias voltage compensation phase P2, T1, T2and T8are turned on to reset N2, or reset N1and N3, T4, T5, T6, T7and T9are turned off.

In the first buffer phase h1, T1and T2are turned on, and T4, T5, T6, T7, T8and T9are turned off.

In the writing-in compensation phase P3, T1, T2, T4and T7are turned on, and T5, T6, T8and T9are turned off, so as to realize the threshold voltage compensation of T3and reset the anode of the light-emitting element O1.

In the second buffer phase h2, T1, T2, T5, T8and T9are turned off, T4and T7are changed from on to off, T6is changed from off to on, and the potential of the N1point is maintained at the compensated voltage after the writing-in compensation period.

In the light-emitting phase P4, T3, T5, T6and T9are turned on, T1, T2, T4, T7and T8are turned off, and the light-emitting element O1emits light.

Exemplarily, as shown inFIG.2, N1is the first node, and the first node N1is electrically connected to the gate electrode of T3: N2is the second node, and N3is the third node: N2is electrically connected to the source electrode of T3, and N3is electrically connected to the drain electrode of T3.

Exemplarily, in at least one embodiment of the pixel circuit, T1, T2, T3, T4, T5, T6, T7and T8may all be low temperature polysilicon thin film transistors, T1, T2, T3, T4, T5, T6, T7and T8may all be p-type transistors, but not limited thereto.

Exemplarily, T1and T2may be single-gate transistors or dual-gate transistors.

By adding T8to provide a bias voltage for the first electrode or the second electrode of T3, it is beneficial to improve the stability of T3: by setting T7to initialize the potential of the anode of O1, it is beneficial to the freedom degree of switching frequency under low frequency flickering.

As shown inFIG.2,FIG.5,FIG.8andFIG.9, an embodiment of the present disclosure further provides a driving method, which is applied to the pixel circuit provided by the above-mentioned embodiment, and the display period includes a bias voltage compensation phase P2and a writing-in compensation phase P3, the driving method includes:

In the bias voltage compensation phase P2, controlling, by the reset circuit20, to connect the reset voltage line DR and the second end of the driving circuit11under the control of the third scan signal; or control to connect the reset voltage line DR and the first end of the driving circuit11under the control of the third scan signal, so as to write the reset voltage to the first end or the second end of the driving circuit11;

In the writing-in compensation phase P3, controlling, by the data writing-in circuit41, to connect data line D1and the second end of the driving circuit11under the control of the first scan signal, and write the data signal to the second end of the driving circuit11.

When the pixel circuit is driven by the driving method provided by the embodiment of the present disclosure, a reset voltage can be applied to the first end or the second end of the driving circuit11in the bias voltage compensation phase P2, so that before the data signal is written, the first end or the second end of the driving circuit is reset to eliminate the influence of the previous frame of image on the driving circuit11, and to ensure that the state of the driving circuit is the same when the next frame of image is written: so that the compensation driving circuit11works at a certain bias voltage for a period of time, the characteristics thereof are shifted to improve short-term afterimages and slow response times. In addition, when driving at low frequency, the difference in brightness caused by the characteristic shift of the driving circuit11in the long-term light-emitting phase can be compensated, the Flicker phenomenon of the screen can be improved, the screen quality can be optimized, and the user experience can be improved. In addition, when the pixel circuit provided by the embodiment of the present disclosure is applied to a display device, the driving method provided by the embodiment of the present disclosure is used to drive the pixel circuit, so that the specific bias voltage compensation is implemented on the driving circuit11in each pixel circuit in the display device, the compensation effect is good.

In addition, since the reset voltage provided by the reset voltage line DR can be adjusted independently, an appropriate bias voltage can be provided to each pixel circuit in the display device as required.

In some embodiments, in the bias voltage compensation phase P2, the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal: the third initialization circuit15controls to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal: the light-emitting control circuit31controls to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal: the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal.

Exemplarily, in the bias voltage compensation phase P2, the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal: the third initialization circuit15controls to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal: so as to reset the control end of the driving circuit11. Under the control of the second scan signal, the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11to reset the first end of the driving circuit11.

In some embodiments, in the bias voltage compensation phase P2, the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal: the third initialization circuit15controls to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal: the light-emitting control circuit31control to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal: the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal.

Exemplarily, in the bias voltage compensation phase P2, the first initialization circuit14controls to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal: the third initialization circuit15controls to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, so as to reset the control end of the driving circuit11. Under the control of the second scan signal, the compensation control circuit13controls to connect the control end of the driving circuit11and the first end of the driving circuit11to reset the first end of the driving circuit11.

In some embodiments, the display period further includes an initialization phase P1before the bias voltage compensation phase P2; the driving method further includes:

In the initialization phase P1, controlling, by the first initialization circuit14, to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; controlling, by the third initialization circuit15, to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal; controlling, by the light-emitting control circuit31, to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal: controlling, by the compensation control circuit13, to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal.

In the initialization phase P1, controlling, by the first initialization circuit14, to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; controlling, by the third initialization circuit15, to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, to reset the first end of the driving circuit11: controlling, by the compensation control circuit13, to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal, so as to reset the control end of the driving circuit11. In the bias voltage compensation phase P2: controlling, by the first initialization circuit14, to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; controlling, by the third initialization circuit15, to disconnect the first end of the driving circuit and the connection node N0under the control of the second light-emitting control signal: controlling, by the compensation control circuit13, to connect the control end of the driving circuit11and the first end of the driving circuit under the control of the second scan signal.

In some embodiments, the display period further includes an initialization phase P1before the bias voltage compensation phase P2: the driving method further includes:

In the initialization phase P1, controlling, by the first initialization circuit14, to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; controlling, by the third initialization circuit15, to connect the first end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal; controlling, by the light-emitting control circuit31, to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal: controlling, by the compensation control circuit13, to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second scan signal.

In the initialization phase P1, controlling, by the first initialization circuit14, to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal; controlling, by the third initialization circuit15, to connect the control end of the driving circuit11and the connection node N0under the control of the second light-emitting control signal, to reset the control end of the driving circuit11: controlling, by the compensation control circuit13, to connect the control end of the driving circuit11and the first end of the driving circuit11under the control of the second light-emitting control signal, to reset the first end of the driving circuit11. In the bias voltage compensation phase P2: controlling, the first initialization circuit14, to connect the first initialization voltage line Vinit1and the connection node N0under the control of the second scan signal: controlling, by the third initialization circuit15, to disconnect the control end of the driving circuit and the connection node N0under the control of the second light-emitting control signal: controlling, by the compensation control circuit13, to connect the control end of the driving circuit11and the first end of the driving circuit11under the second scan signal.

In some embodiments, the display period further includes a light-emitting phase P4after the writing-in compensation phase P3: the driving method further includes:

In the light-emitting phase P4, controlling, by the light-emitting control circuit31, to connect the first voltage line and the second end of the driving circuit11under the control of the second light-emitting control signal, and to connect the first end of the driving circuit11and the light-emitting element O1under the control of the first light-emitting control signal, and driving, by the driving circuit11, the light-emitting element O1to emit light.

Embodiments of the present disclosure further provide a display device including the pixel circuit provided by the above embodiments.

Because in the pixel circuit provided by the above embodiment, by setting the reset circuit20, a reset voltage can be applied to the first end or the second end of the driving circuit11in the bias voltage compensation phase P2, so that before the data signal is written, the first end or the second end of the driving circuit is reset to eliminate the influence of the previous frame of image on the driving circuit11, and to ensure that the state of the driving circuit is the same when the next frame of image is written: so that the compensation driving circuit11works at a certain bias voltage for a period of time, the characteristics thereof are shifted to improve short-term afterimages and slow response times. In addition, when driving at low frequency, the difference in brightness caused by the characteristic shift of the driving circuit11in the long-term light-emitting phase can be compensated, the Flicker phenomenon of the screen can be improved, the screen quality can be optimized, and the user experience can be improved. In addition, when the pixel circuit provided by the embodiment of the present disclosure is applied to a display device, the driving method provided by the embodiment of the present disclosure is used to drive the pixel circuit, so that the specific bias voltage compensation is implemented on the driving circuit11in each pixel circuit in the display device, the compensation effect is good. In addition, when the pixel circuits provided in the above embodiments are applied to the display substrate, specific bias voltage compensation can be implemented for the driving circuit11in each pixel circuit in the display substrate, which has a good compensation effect. In addition, since the reset voltage provided by the reset voltage line DR can be adjusted independently, an appropriate bias voltage can be provided to each pixel circuit in the display substrate as required.

Therefore, when the display device provided by the embodiment of the present disclosure includes the above-mentioned pixel circuit, it also has the above-mentioned beneficial effects, which will not be repeated here.

It should be noted that the display device can be any product or component with a display function, such as a TV, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device also includes a flexible circuit board, a printed circuit board, a back plate and so on.

It should be noted that the “same layer” in the embodiments of the present disclosure may refer to a film layer on the same structural layer. Or, for example, the film layers in the same layer may be a layer structure formed by using the same film forming process to form a film layer for forming a specific pattern, and then using the same mask to pattern the film layer through one patterning process. Depending on the specific pattern, one patterning process may include multiple exposure, development or etching processes, and the specific patterns in the formed layer structure may be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

In the method embodiments of the present disclosure, the sequence numbers of the steps are not used to limit the sequence of the steps. For those of ordinary skill in the art, the sequence of the steps can be changed without any creative effort, which is also within the scope of protection of the present disclosure.

It should be noted that each embodiment in the present disclosure is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the method embodiment, since it is basically similar to the product embodiment, the description is relatively simple, and the relevant part can be referred to the part of the description of the product embodiment.

Unless otherwise defined, technical or scientific terms used in the present disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in the present disclosure, “first,” “second,” and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish various components. “Including” or “comprising” and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like “connected,” “coupled” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “Down”, “Left”, “Right”, etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

It will be understood that when an element such as a layer, film, region or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element, or an intermediate element may be present.

In the foregoing description of the embodiments, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more of the embodiments or examples.

The above embodiments are for illustrative purposes only, but the present disclosure is not limited thereto. Obviously, a person skilled in the art may make further modifications and improvements without departing from the spirit of the present disclosure, and these modifications and improvements shall also fall within the scope of the present disclosure.