Display panel with improving flickering problem in low frequency mode, and display device
Display panel and display device are provided. The display panel includes a base substrate; a plurality of pixel circuits, on a side of the base substrate; and light-emitting elements electrically connected to the plurality of pixel circuits. A pixel circuit of the plurality of pixel circuits includes a driving transistor; a first transistor, connected in series between the driving transistor and the data line, transmitting a data signal to the driving transistor in response to a first scanning signal; a second transistor, electrically connected between the driving transistor and a light-emitting element of the light-emitting elements, and transmitting a driving current to the light-emitting element of the light-emitting elements in response to a light-emitting control signal; a first capacitor; and the first node, on a side of the second plate of the first capacitor away from the base substrate.
1. A display panel, comprising:
a base substrate;
a plurality of pixel circuits, on a side of the base substrate; and
light-emitting elements electrically connected to the plurality of pixel circuits,
wherein a pixel circuit of the plurality of pixel circuits includes:
a driving transistor, a gate of the driving transistor being electrically connected to a first node and providing a driving current for a light-emitting element of the light-emitting elements,
a first transistor, electrically connected in series between the driving transistor and a data line, and transmitting a data signal to the driving transistor in response to a first scanning signal,
a second transistor, electrically connected between the driving transistor and the light-emitting element of the light-emitting elements, and transmitting the driving current to the light-emitting element of the light-emitting elements in response to a light-emitting control signal,
a first capacitor, a first plate of the first capacitor being electrically connected to the first node, and a second plate of the first capacitor being electrically connected to a voltage line of a first power supply, and
the first node, coupled to a side of the second plate of the first capacitor through the first plate of the first capacitor,
wherein:
the plurality of pixel circuits are arranged in M rows and N columns, N≥2, and M≥2,
the data line transmits the data signal in a display area scanning period, and the data signal in the display area scanning period includes a first level V 1 ,
the data line transmits the data signal in a front and rear corridor period, and the data signal in the front and rear corridor period includes a second level V 2 ,
V 1≠ V 2,
a total duration of the display area scanning period is t 1 , a total duration of the front and rear corridor period is t 2 , and t 1 <t 2 , and
t 1/( t 1+ t 2)≤1/4, and
wherein:
the M rows are arranged along a first direction;
the first scanning signal includes a valid signal and an invalid signal, and the first transistor is turned on when the first scanning signal is a valid signal;
the display panel includes a first driving cycle and a second driving cycle adjacent to the first driving cycle;
a starting time of the display area scanning period coincides with an initiation of a valid signal from the first scanning signal corresponding to a first row of pixel circuits in the first driving cycle, while a cut-off time of the display area scanning period aligns with a termination of a valid signal from the first scanning signal corresponding to a M-th row in the first driving cycle; and
a starting time of the front and rear corridor period aligns with a termination of a valid signal from the first scanning signal corresponding to the M-th row in the first driving cycle, and a cut-off time of the front and rear corridor period coincides with an initiation of a valid signal of the first scanning signal corresponding to the first row of pixel circuits in the second driving cycle.
2. The display panel according to claim 1 , wherein t 1 :t 2 =1/3, 1/4, or 1/5.
3. The display panel according to claim 1 , further comprising M light-emitting control signal lines, wherein:
a light-emitting control signal line of the M light-emitting control signal lines is electrically connected to a gate of the second transistor to transmit the light-emitting control signal, and M is a positive integer greater than 2;
the light-emitting control signal includes K valid pulses and K invalid pulses arranged alternately, and K is a positive integer greater than or equal to 2; and
a working cycle of the M-th row includes a data writing stage and a light-emitting maintenance stage, the data writing stage includes a first pulse group, and the light-emitting maintenance stage includes a second to a K-th pulse group.
4. The display panel according to claim 3 , wherein K=4, 5 or 6.
5. The display panel according to claim 3 , wherein the data signal remains at the second level V 2 in the front and rear corridor period.
6. The display panel according to claim 5 , wherein:
the driving transistor is a P-type transistor, and the first level V 1 of the data signal is less than the second level V 2 of the data signal; or
the driving transistor is an N-type transistor, and the first level V 1 of the data signal is greater than the second level V 2 of the data signal.
7. The display panel according to claim 3 , wherein:
the M rows comprise a H-th row, and
a working cycle of the H-th row includes the data writing stage and the light-emitting maintenance stage, the data writing stage includes the first pulse group, the light-emitting maintenance stage includes the second to a K-th pulse group, when a pulse signal is a (K−1)-th pulse, the second level of the data signal is V 21 , when the pulse signal is the K-th pulse, the second level of the data signal is V 22 , V 21 <V 22 , and 1<H<M.
8. The display panel according to claim 7 , wherein when the pulse signal is the second to a (K−2)-th pulse, the second level of the data signal is V 23 , and V 22 <V 23 .
9. The display panel according to claim 1 , further comprising M light-emitting control signal lines, wherein:
a light-emitting control signal line of the M light-emitting control signal lines is electrically connected to a gate of the second transistor to transmit a light-emitting control signal, and M is a positive integer greater than 2;
the light-emitting control signal includes a plurality of invalid pulses and a plurality of valid pulses arranged alternately; and
in a working cycle of the M-th row, a total duration of the valid pulses is T 1 , a total duration of the invalid pulses is T 2 , and 10%≤T 1 /(T 1 +T 2 )≤50%.
10. The display panel according to claim 1 , wherein:
the pixel circuit also includes a third transistor electrically connected in series between the first node and a first reset signal line, is turned on in response to a second scanning signal, and switches a signal from the first reset signal line to the gate of the driving transistor; and
the first scanning signal includes a valid signal and an invalid signal, the second scanning signal includes a valid signal and an invalid signal, a cut-off time of a valid signal of the second scanning signal occurs before a starting time of a valid signal of the first scanning signal.
11. The display panel according to claim 1 , wherein the pixel circuit further includes a fourth transistor connected in series between the first node and a drain of the driving transistor, the fourth transistor is turned on in response to the first scanning signal and transmits a signal from the drain of the driving transistor to the gate of the driving transistor.
12. The display panel according to claim 1 , wherein the pixel circuit further includes a fifth transistor connected in series between an anode of the light-emitting element and a second reset signal line, the fifth transistor is turned on in response to a second scanning signal, and transmits a signal transmitted by the second reset signal line to the anode of the light-emitting element.
13. The display panel according to claim 1 , wherein driving frequencies of the display panel include a first driving frequency less than or equal to 60 Hz.
14. The display panel according to claim 1 , further comprising a second capacitor, wherein:
the first node includes a first part, and the data line includes a second part, and a gap exists between an orthographic projection of the first part on the base substrate and an orthographic projection of the second part on the base substrate; and
the first part is multiplexed as a first plate of the second capacitor, and the second part is multiplexed as a second plate of the second capacitor.
15. A display device, comprising a display panel comprising:
a base substrate;
a plurality of pixel circuits, on a side of the base substrate; and
light-emitting elements electrically connected to the plurality of pixel circuits, a pixel circuit of the plurality of pixel circuits including:
a driving transistor, a gate of the driving transistor being electrically connected to a first node and providing a driving current for a light-emitting element of the light-emitting elements,
a first transistor, electrically connected in series between the driving transistor and the data line, and transmitting a data signal to the driving transistor in response to a first scanning signal,
a second transistor, electrically connected between the driving transistor and the light-emitting element of the light-emitting elements, and transmitting a driving current to the light-emitting element of the light-emitting elements in response to a light-emitting control signal,
a first capacitor, a first plate of the first capacitor being electrically connected to the first node, and a second plate of the first capacitor being electrically connected to a voltage line of the first power supply, and
the first node, coupled to a side of the second plate of the first capacitor through the first plate of the first capacitor,
wherein:
the plurality of pixel circuits are arranged in M rows and N columns, N≥2, and M≥2,
the data line transmits the data signal in a display area scanning period, and the data signal in the display area scanning period includes a first level V 1 ,
the data line transmits the data signal in a front and rear corridor period, and the data signal in the front and rear corridor period includes a second level V 2 ,
V 1≠ V 2,
a total duration of the display area scanning period is t 1 , a total duration of the front and rear corridor period is t 2 , and t1<t 2 , and
t 1/( t 1+ t 2)≤1/4, and
wherein:
the M rows are arranged along a first direction;
the first scanning signal includes a valid signal and an invalid signal, and the first transistor is turned on when the first scanning signal is a valid signal;
the display panel includes a first driving cycle and a second driving cycle adjacent to the first driving cycle;
a starting time of the display area scanning period coincides with an initiation of a valid signal from the first scanning signal corresponding to a first row of pixel circuits in the first driving cycle, while a cut-off time of the display area scanning period aligns with a termination of a valid signal from the first scanning signal corresponding to a M-th row in the first driving cycle; and
a starting time of the front and rear corridor period aligns with a termination of a valid signal from the first scanning signal corresponding to the M-th row in the first driving cycle, and a cut-off time of the front and rear corridor period coincides with an initiation of a valid signal of the first scanning signal corresponding to the first row of pixel circuits in the second driving cycle.