Driver circuit for display panel, display panel and driving method for display panel
A driver circuit of a display panel, a display panel, and a driving method of the display panel. The display panel includes a plurality of sub-pixel units, and the driver circuit includes a plurality of detection capacitors, a detection capacitor and a compensation module; a first end of each of the plurality of detection capacitors is electrically connected to the plurality of sub-pixel units, and a second end of each of the plurality of detection capacitors is grounded; a first end of the drive module is electrically connected to the first end of each of the plurality of detection capacitors; and a second end of the drive module is electrically connected to the compensation module.
1. A driver circuit of a display panel, wherein the display panel comprises a plurality of sub-pixel units, and the driver circuit comprises:
a plurality of detection capacitors, first ends of the plurality of detection capacitors electrically connected to the plurality of the sub-pixel units of the display panel and second ends of the plurality of detection capacitors being grounded;
a drive module, a first end of the drive module electrically connected to the first end of each of the plurality of detection capacitors, and the drive module is configured to acquire a voltage of each of the plurality of detection capacitors after being discharged through a corresponding sub-pixel unit of the plurality of sub-pixel units within a detection time duration in a detection mode; and
a compensation module, electrically connected to a second end of the drive module and configured to determine a compensation gain value corresponding to the each sub-pixel unit according to the voltage after being discharged and determine a drive signal of the each sub-pixel unit upon displaying a preset gray scale according to the compensation gain value;
wherein the detection time duration is determined according to a service time duration of the display panel,
wherein the compensation module determines the compensation gain value corresponding to the each sub-pixel unit by adopting a formula as follows
Gain
=
T
23
t
23
·
V
REF
-
V
SEN
0
V
REF
-
V
SEN
,
wherein in response to t>tp, T 23 =K*t, and in response to t≤tp, T 23 =t 23 , K is an aging coefficient of the display panel, t is the service time duration of the display panel, and tp is a time constant wherein V SEN is a voltage of each of the plurality of detection capacitors after being discharged within the detection time duration T 23 at a current moment, VS SEN0 is a voltage of each of the plurality of detection capacitors after being discharged within an initial detection time duration t 23 in a factory shipment, V REF is a reference voltage of each of the plurality of detection capacitors before being discharged, and Gain is the compensation gain value corresponding to the each sub-pixel unit.
2. The driver circuit of claim 1 , wherein, the drive module comprises a drive unit configured to collect the voltage of each of the plurality of detection capacitors after being discharged within the detection time duration;
the drive unit comprises an analog-to-digital converter; and
a detection voltage range of the analog-to-digital converter is determined according to the service time duration of the display panel.
3. The driver circuit of claim 2 , wherein,
the drive module further comprises a switching unit, and the drive unit is electrically connected to the each sub-pixel unit through the switching unit; and
the switching unit is configured to switch to a corresponding conduction channel based on a working state of the drive unit.
4. The driver circuit of claim 3 , wherein,
the switching unit comprises:
a second switch, a control end of the second switch configured to receive a second control signal, a first end of the second switch electrically connected to the first end of each of the plurality of detection capacitors, and a second end of the second switch configured to receive a reference voltage; and
a third switch, a control end of the third switch configured to receive a third control signal, a first end of the third switch electrically connected to the drive unit, and a second end of the third switch connected to the first end of the second switch.
5. The driver circuit of claim 4 , further comprising: a first capacitor and a fourth switch;
wherein the each sub-pixel unit comprises a pixel driver circuit for driving the each sub-pixel unit to emit light, a first end of the fourth switch is electrically connected to the first end of the third switch and a first end of the first capacitor, a second end of the fourth switch is electrically connected to the pixel driver circuit through a data bus, a control end of the fourth switch is configured to receive a fourth control signal, and a second end of the first capacitor is grounded.
6. A display panel, comprising the driver circuit of the display panel of claim 1 .
7. The display panel of claim 6 , wherein,
the drive module comprises a drive unit configured to collect the voltage of each of the plurality of detection capacitors after being discharged within the detection time duration;
the drive unit comprises an analog-to-digital converter; and
a detection voltage range of the analog-to-digital converter is determined according to the service time duration of the display panel.
8. The display panel of claim 7 , wherein,
the drive module further comprises a switching unit, and the drive unit is electrically connected to the each sub-pixel unit through the switching unit; and
the switching unit is configured to switch to a corresponding conduction channel based on a working state of the drive unit.
9. The display panel of claim 6 , wherein the each sub-pixel unit comprises a first switch and an organic light emitting diode;
wherein a first end of the first switch is electrically connected to the organic light-emitting diode,
a second end of the first switch is electrically connected to the first end of each of the plurality of detection capacitors, and a control end of the first switch is configured to receive a first control signal.
10. The driver circuit of claim 9 , wherein the each sub-pixel unit further comprises a pixel driver circuit configured to drive the plurality of sub-pixel units to emit light, and the first switch is a thin film transistor in the pixel driver circuit.
11. The display panel of claim 6 , wherein each of the plurality of sub-pixel unit comprises a pixel driver circuit configured to drive the each sub-pixel unit to emit light, the drive signal comprises a driving current and a driving voltage, and the compensation module determines the drive signal of the each sub-pixel unit upon the each sub-pixel unit displaying the preset gray scale by adopting a formula as follows:
I′=Gain·I 0 ,
wherein I 0 is a driving current without compensation, I′ is a driving current with compensation, and Gain is the compensation gain value corresponding to the each sub-pixel unit;
V DATA =ELVDD−√{square root over (Gain)}·(ELVDD−V DATA ), wherein ELVDD is a first reference voltage of the pixel driver circuit, Gain is the compensation gain value corresponding to the each sub-pixel unit, V DATA is a driving voltage without compensation, and V DATA ′ is a driving voltage with compensation.
12. The driver circuit of claim 1 , wherein,
the each sub-pixel unit comprises a first switch and an organic light emitting diode;
wherein a first end of the first switch is electrically connected to the organic light-emitting diode,
a second end of the first switch is electrically connected to the first end of each of the plurality of detection capacitors, and a control end of the first switch is configured to receive a first control signal.
13. The driver circuit of claim 12 , wherein the first control signal is provided by the drive module or the compensation module.
14. The driver circuit of claim 1 , wherein the plurality of sub-pixel units of the display panel are configured in a plurality of columns and each of the plurality of detection capacitors is electrically connected to a corresponding one of the plurality of columns of the sub-pixel units.
15. The driver circuit of claim 1 , further comprising a timer electrically connected to a third end of the drive module and configured to measure the service time duration of the display panel;
wherein the drive module is configured to determine the detection time duration according to the service time duration measured by the timer.
16. The driver circuit of claim 1 , wherein each of the plurality of sub-pixel unit comprises a pixel driver circuit configured to drive the each sub-pixel unit to emit light, the drive signal comprises a driving current and a driving voltage, and the compensation module determines the drive signal of the each sub-pixel unit upon the each sub-pixel unit displaying the preset gray scale by adopting a formula as follows:
I′=Gain·I 0 ,
wherein I 0 is a driving current without compensation, I′ is a driving current with compensation, and Gain is the compensation gain value corresponding to the each sub-pixel unit;
V DATA ′=ELVDD−√{square root over (Gain)}·(ELVDD−V DATA ), wherein ELVDD is a first reference voltage of the pixel driver circuit, Gain is the compensation gain value corresponding to the each sub-pixel unit, V DATA is a driving voltage without compensation, and V DATA ′ is a driving voltage with compensation.
17. The driver circuit of claim 1 , wherein the drive unit is further configured to provide a reference voltage to each of the plurality of detection capacitors.
18. The driver circuit of claim 1 , wherein the detection mode comprises a pre-charging stage, a discharging stage, and a voltage sampling stage;
in the pre-charging stage, the drive module provides a reference voltage to each of the plurality of detection capacitors; in the discharging stage, a reference voltage written in each of the plurality of detection capacitors is discharged through the plurality of sub-pixel units; and in the voltage sampling stage, the drive module collects a voltage of each of the plurality of detection capacitors, so that the voltage of each of the plurality of detection capacitors after being discharged through the corresponding sub-pixel unit is determined, wherein the discharging stage and the voltage sampling stage constitute the detection time duration.