CN112086056B - Pixel circuit and driving method thereof, display panel and driving method thereof - Google Patents
Pixel circuit and driving method thereof, display panel and driving method thereof Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The embodiment of the invention discloses a pixel circuit and a driving method thereof, a display panel and a driving method thereof.A grid electrode potential detection module detects and outputs grid electrode potential of a driving transistor in a detection stage under a detection mode, and a data writing module writes an update data voltage signal corresponding to a preset gray scale into a grid electrode of the driving transistor in a data writing stage under the display mode; the threshold compensation module writes a compensation signal containing the threshold voltage information of the driving transistor into the grid electrode of the driving transistor; the update data voltage signal is positively correlated with the initial data voltage signal and positively correlated with the first difference. Under the same preset gray scale, after the updated data voltage signals corresponding to different pixel circuits are written into the grids of the respective driving transistors, the inconsistent degree of the grid potentials of the driving transistors, which is caused by different voltage drops of the driving transistors, can be reduced, so that the display uniformity of the display panel can be improved, and the occurrence of residual shadows can be reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit and a driving method thereof, and a display panel and a driving method thereof.
Background
With the development of display technology, the requirements on display quality are higher and higher.
A conventional display panel generally includes a plurality of pixel circuits including driving transistors. Because the threshold voltages of the driving transistors of different pixel circuits are different due to the uncontrollable process, the conventional pixel circuit generally includes a structure for compensating the threshold voltage of the driving transistor.
However, the pixel circuit in the conventional display panel still has the problems of poor compensation effect on the threshold voltage of the driving transistor under low gray scale, poor brightness uniformity of the display panel and even image sticking.
Disclosure of Invention
The invention provides a pixel circuit and a driving method thereof, a display panel and a driving method thereof, which are used for improving the compensation effect of a low-gray-scale lower threshold voltage, improving the brightness uniformity of the display panel and reducing the occurrence of ghost shadow.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including: the device comprises a data writing module, a threshold compensation module, a driving transistor and a grid electrode potential detection module;
the data writing module is used for writing an initial data voltage signal corresponding to a preset gray scale into a grid electrode of the driving transistor in a data writing stage in a detection mode;
the threshold compensation module is used for writing a compensation signal containing threshold voltage information of the driving transistor into a grid electrode of the driving transistor in a data writing stage under a detection mode and a display mode;
the grid potential detection module is used for detecting and outputting the grid potential of the driving transistor at a detection stage in a detection mode;
the data writing module is also used for writing an updating data voltage signal corresponding to the preset gray scale into the grid electrode of the driving transistor at the data writing stage in the display mode;
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and the gate potential of the driving transistor.
In a second aspect, an embodiment of the present invention further provides a driving method of a pixel circuit, for driving the pixel circuit provided in the first aspect, including:
in a data writing stage in a detection mode, a data writing module writes an initial data voltage signal corresponding to a preset gray scale into a grid electrode of a driving transistor; the threshold compensation module writes a compensation signal containing the threshold voltage information of the driving transistor into the grid electrode of the driving transistor;
in the detection stage under the detection mode, the grid potential detection module detects and outputs the grid potential of the driving transistor;
in a data writing stage in a display mode, the data writing module writes an update data voltage signal corresponding to a preset gray scale into a grid electrode of the driving transistor; the threshold compensation module writes a compensation signal containing the threshold voltage information of the driving transistor into the grid electrode of the driving transistor;
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and the gate potential of the driving transistor.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit provided in the first aspect, further including a driving chip, a plurality of detection signal lines electrically connected to the driving chip, and a plurality of data lines electrically connected to the driving chip, where each detection signal line is connected to a gate potential detection module of a row of pixel circuits, and each data line is connected to a data writing module of a row of pixel circuits;
the driving chip is used for outputting an initial data voltage signal corresponding to a preset gray scale to the data line in a data writing stage in a detection mode so as to write the initial data voltage signal into the grid electrodes of the driving transistors of the pixel circuits in the display panel line by line;
the driving chip is also used for acquiring the grid potential of the driving transistor output by the grid potential detection module in the pixel circuit line by line at the detection stage in the detection mode, and determining an updated data voltage signal for each pixel circuit according to the difference value of the initial data voltage signal and the grid potential of the driving transistor and the initial data voltage signal;
the driving chip is also used for outputting an update data voltage signal corresponding to the preset gray scale to the data line at a data writing stage in a display mode when the gray scale to be displayed corresponding to the pixel circuit connected with the data line is the preset gray scale;
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and the gate potential of the driving transistor.
In a fourth aspect, an embodiment of the present invention further provides a driving method of a display panel, including:
outputting an initial data voltage signal corresponding to a preset gray scale to a data line in a data writing stage in a detection mode so as to write the initial data voltage signal into the grid electrodes of the driving transistors of the pixel circuits in the display panel line by line;
in a detection stage in a detection mode, acquiring the grid potential of a driving transistor output by a grid potential detection module in a pixel circuit line by line, and determining an updated data voltage signal for each pixel circuit according to the difference value of an initial data voltage signal and the grid potential of the driving transistor and the initial data voltage signal;
when the gray scale to be displayed corresponding to the pixel circuit connected with the data line is a preset gray scale, outputting an update data voltage signal corresponding to the preset gray scale to the data line in a data writing stage in a display mode;
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and the gate potential of the driving transistor.
In the pixel circuit and the driving method thereof, and the display panel and the driving method thereof provided by this embodiment, the gate potential of the driving transistor is detected and output by the gate potential detecting module at the detection stage in the detection mode, and the data writing module writes the update data voltage signal corresponding to the preset gray scale into the gate of the driving transistor at the data writing stage in the display mode; the threshold compensation module writes a compensation signal containing the threshold voltage information of the driving transistor into the grid electrode of the driving transistor; the update data voltage signal is positively correlated with the initial data voltage signal and positively correlated with the first difference. The update data voltage signal takes the voltage drop possibly generated when the update data voltage signal is written into the grid electrode of the drive transistor into consideration in advance, namely, the greater the first difference value is, the greater the update data voltage signal is, so that even if the threshold voltages of the drive transistors corresponding to different pixel circuits are different, under the same preset gray scale, after the update data voltage signals corresponding to different pixel circuits are written into the grid electrodes of the respective drive transistors, the inconsistent degree of the grid electrode potentials of the drive transistors caused by the different voltage drops of the drive transistors can be reduced, the display uniformity of the display panel can be improved, and the occurrence of afterimages can be reduced. And the updating data voltage signal is positively correlated with the initial voltage signal, and the positive correlation between the updating data voltage signal and the initial data voltage signal can ensure that the trend of the updating data voltage signal changing along with the preset gray scale is consistent with the trend of the initial data voltage signal changing along with the preset gray scale, and the normal display of the display panel is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 3 is a driving timing diagram of a pixel circuit in a detection mode according to an embodiment of the invention;
FIG. 4 is a driving timing diagram of a pixel circuit in a display mode according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 6 is a driving timing diagram of another pixel circuit in a detection mode according to an embodiment of the invention;
FIG. 7 is a timing diagram illustrating driving of another pixel circuit in a display mode according to an embodiment of the present invention;
fig. 8 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 11 is a flowchart of a driving method of a display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
As described in the background art, the pixel circuit in the conventional display panel still has the problem of poor compensation effect on the threshold voltage of the driving transistor under the low gray scale, so that the brightness uniformity of the display panel is poor, and even the ghost image occurs. The inventor has found that the above problems occur because, during low gray scale display, the driving transistors in the pixel circuits operate in a linear region, and because the properties of the driving transistors determine that the driving transistors operate in the linear region, the effect of compensating for the threshold voltage cannot be achieved, and because the threshold voltages of the driving transistors in different pixel circuits in the display panel have differences, the written potentials of the gates of the driving transistors in different pixel circuits under the same gray scale are different, so that the luminance of the light emitting device is different, and the uniformity of the display panel is poor, even the ghost occurs.
In view of the above, an embodiment of the invention provides a pixel circuit, and fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention, and referring to fig. 1, the pixel circuit includes a data writing module 110, a threshold compensation module 120, a driving transistor DT, and a gate potential detection module 130; the data writing module 110 is configured to write an initial data voltage signal corresponding to a preset gray scale into a gate of the driving transistor DT at a data writing stage in the detection mode; the threshold compensation module 120 is configured to write a compensation signal including threshold voltage information of the driving transistor DT into a gate of the driving transistor DT during a data writing phase in the detection mode and the display mode; the gate potential detecting module 130 is configured to detect and output a gate potential of the driving transistor DT during a detection phase in the detection mode; the data writing module 110 is further configured to write an update data voltage signal corresponding to a preset gray scale into the gate of the driving transistor DT at a data writing stage in the display mode; the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, which is a difference value between the initial data voltage signal and the gate potential of the driving transistor DT.
For the same pixel circuit, the first difference value may correspond to the preset gray scales one to one, that is, the first difference value may be different for different preset gray scales of the same pixel circuit, and may also be different for the same preset gray scale of different pixel circuits.
Specifically, the operation modes including the pixel circuit of this embodiment may include a display mode and a detection mode. For any preset gray scale, the corresponding relation between the preset gray scale and the initial data voltage signal is stored in the driving chip in advance. In the detection mode, the data writing module 110 is turned on to write the initial data voltage signal to the gate of the driving transistor DT. As analyzed by the reasons for the problems in the related art, the conventional pixel circuit cannot achieve the effect of compensating the threshold voltage of the driving transistor DT at a low gray scale, and the difference of the threshold voltage of the driving transistor DT in the pixel circuit in the display panel causes different driving currents generated by the driving transistors DT of different pixel circuits at the same gray scale, resulting in different light emitting luminances of the light emitting devices, and thus poor uniformity of the display panel. In the technical solution of this embodiment, the pixel circuit includes a gate potential detecting module 130, the gate potential detecting module 130 may detect and output a gate potential of the driving transistor DT in a detecting phase (where the detecting phase may be performed after a data writing phase) in a detecting mode, specifically, the gate potential detecting module 130 may output the gate potential of the driving transistor DT to a driving chip of a display panel including the pixel circuit of this embodiment, so that the driving chip obtains a difference between an initial data voltage signal corresponding to the pixel circuit and the gate potential of the driving transistor DT by comparing an initial data voltage signal and the detected gate potential of the driving transistor DT, and determines an update data voltage signal according to the difference and the initial data voltage signal, and when a to-be-displayed gray scale corresponding to the pixel circuit is a preset gray scale in the display mode, the driving chip may provide a corresponding update data voltage signal to the pixel circuit, and the data writing module 110 of the pixel circuit may write the update data voltage signal to the gate potential of the driving transistor DT through the driving transistor DT and the compensating module. Wherein for any predetermined gray scale, the update data voltage signal is positively correlated with the initial data voltage signal and with the first difference. Since the first difference is a difference between the initial data voltage signal and the gate potential of the driving transistor DT after the initial data voltage is written into the gate of the driving transistor DT, the first difference can be understood as a voltage drop generated by the initial data voltage signal passing through the data writing module 110, the driving transistor DT and the threshold compensation module 120, and the data writing module 110 and the threshold compensation module 120 are usually only used as switches during the driving process, without considering the voltage drop, and therefore, the first difference can be understood as a voltage drop generated by the initial data voltage signal passing through the driving transistor DT. In the technical solution of this embodiment, the update data voltage signal is positively correlated with the first difference, that is, when other parameters related to the update data voltage signal are kept unchanged, the larger the first difference is, the larger the update data voltage is. In the display mode, the update data voltage signal also needs to be written to the gate of the driving transistor DT through the data writing module 110, the driving transistor DT and the threshold compensation module 120, and accordingly, a voltage drop is also generated during writing. The update data voltage signal is positively correlated with the first difference, so that the update data voltage signal takes the voltage drop which may be generated when the update data voltage signal is written into the gate of the driving transistor DT into consideration in advance, that is, the greater the first difference, the greater the update data voltage signal, so that even if the threshold voltages of the driving transistors DT corresponding to different pixel circuits are different, the degree of the inconsistency of the gate potentials of the driving transistors DT caused by the different voltage drops across the driving transistors DT is reduced after the update data voltage signals corresponding to different pixel circuits are written into the gates of the respective driving transistors DT under the same preset gray scale, which is favorable for improving the display uniformity of the display panel and reducing the occurrence of afterimages. And the updating data voltage signal is positively correlated with the initial voltage signal, and the positive correlation between the updating data voltage signal and the initial data voltage signal can ensure that the trend of the updating data voltage signal changing along with the preset gray scale is consistent with the trend of the initial data voltage signal changing along with the preset gray scale, and the normal display of the display panel is ensured.
In the pixel circuit provided by this embodiment, the gate potential of the driving transistor is detected and output by the gate potential detecting module at the detection stage in the detection mode, and the data writing module writes the update data voltage signal corresponding to the preset gray scale into the gate of the driving transistor at the data writing stage in the display mode; the threshold compensation module writes a compensation signal containing the threshold voltage information of the driving transistor into the grid electrode of the driving transistor; the update data voltage signal is positively correlated with the initial data voltage signal and positively correlated with the first difference. The updated data voltage signal is obtained by considering the voltage drop which may be generated when writing in the gate of the driving transistor in advance, that is, the larger the first difference value is, the larger the updated data voltage signal is, so that even if the threshold voltages of the driving transistors corresponding to different pixel circuits are different, the different degrees of the inconsistency of the gate potentials of the driving transistors caused by the different voltage drops of the driving transistors can be reduced after the updated data voltage signals corresponding to different pixel circuits are written in the gates of the respective driving transistors under the same preset gray scale, thereby being beneficial to improving the display uniformity of the display panel and reducing the occurrence of the ghost. And the updating data voltage signal is positively correlated with the initial voltage signal, and the positive correlation between the updating data voltage signal and the initial data voltage signal can ensure that the trend of the updating data voltage signal changing along with the preset gray scale is consistent with the trend of the initial data voltage signal changing along with the preset gray scale, and the normal display of the display panel is ensured.
The above is the core idea of the present invention, and the following will clearly and completely describe the technical solution in the embodiment of the present invention with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
With continued reference to fig. 1, optionally, the pixel circuit further includes a light-emitting control module 140, a light-emitting module 150 and a storage module 160, where the light-emitting control module 140 is configured to control the first pole of the driving transistor DT and the first power voltage input terminal Vdd to be turned off and the second pole of the driving transistor DT and the light-emitting module 150 to be turned off in the data writing phase in the detection mode and the display mode; and in the light emitting stage in the display mode, controlling the conduction between the first pole of the driving transistor DT and the first power voltage input terminal Vdd, and controlling the conduction between the second pole of the driving transistor DT and the light emitting module 150; the storage module 160 is used for maintaining the gate potential of the driving transistor DT;
the driving transistor DT is used to generate a driving signal according to a voltage of the gate electrode of the driving transistor DT and a voltage of the first electrode of the driving transistor DT during a light emitting period in the display mode, and drive the light emitting module 150 to emit light.
With reference to fig. 1, optionally, the control terminal of the Data writing module 110 is electrically connected to the first Scan signal input terminal Scan1, the first terminal of the Data writing module 110 is electrically connected to the Data voltage signal input terminal Data, and the second terminal of the Data writing module 110 is electrically connected to the first pole of the driving transistor DT;
a control terminal of the threshold compensation module 120 is electrically connected to the first Scan signal input terminal Scan1, a first terminal of the threshold compensation module 120 is electrically connected to the second pole of the driving transistor DT, and a second terminal of the threshold compensation module 120 is electrically connected to the gate of the driving transistor DT;
the control end of the gate potential detection module 130 is electrically connected to the detection control signal input end Sense1, the first end of the gate potential detection module 130 is electrically connected to the gate of the driving transistor DT, and the second end of the gate potential detection module 130 is used for outputting the detected gate potential;
the light emission control module 140 includes a first light emission control unit 141 and a second light emission control unit 142, the first light emission control unit 141 is connected between a first power voltage input terminal Vdd and a first pole of the driving transistor DT, the second light emission control unit 142 is connected between a second pole of the driving transistor DT and a first pole of the light emitting device, and a control terminal of the first light emission control unit 141 and a control terminal of the second light emission control unit 142 are both electrically connected to the light emission control signal input terminal EM;
the second pole of the light emitting module 150 is electrically connected to the second power voltage input terminal Vss.
Fig. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, where the pixel circuit may correspond to a specific component circuit of the pixel circuit shown in fig. 1, and referring to fig. 2, the data writing module 110 includes a first transistor T1, the threshold compensation module 120 includes a second transistor T2, the gate potential detection module 130 includes a third transistor T3, the first light emission control unit 141 includes a fourth transistor T4, the second light emission control unit 142 includes a fifth transistor T5, the storage module 160 includes a storage capacitor Cst, and the light emission module 150 includes a light emitting device D1.
With continued reference to fig. 2, optionally, the pixel circuit further includes a sixth transistor T6, wherein a gate of the sixth transistor T6 is electrically connected to the second Scan signal input terminal Scan2, a first pole of the sixth transistor T6 is electrically connected to the initialization voltage input terminal Vref, a second pole of the sixth transistor T6 is electrically connected to the gate of the driving transistor DT, and the sixth transistor T6 is configured to be turned on during the initialization phase to transmit the initialization voltage to the gate of the driving transistor DT. Optionally, the pixel circuit further includes a seventh transistor T7, wherein a gate of the seventh transistor T7 is electrically connected to the second Scan signal input terminal Scan2, a first pole of the seventh transistor T7 is electrically connected to the initialization voltage input terminal Vref, a second pole of the seventh transistor T7 is electrically connected to the first pole of the light emitting device D1, and the seventh transistor T7 is configured to be turned on in the initialization phase to transmit the initialization voltage to the first pole of the light emitting device D1. In this embodiment, each transistor may be a P-type transistor or an N-type transistor, and the pixel circuit shown in fig. 2 shows a case where each transistor is a P-type transistor, and the following description will be given by taking a transistor included in the pixel circuit as an example of a P-type transistor.
Fig. 3 is a driving timing diagram of a pixel circuit in a detection mode according to an embodiment of the present invention, and fig. 4 is a driving timing diagram of a pixel circuit in a display mode according to an embodiment of the present invention; the driving timing shown in fig. 3 and 4 can be used to drive the pixel circuit shown in fig. 2.
Referring to fig. 2 and 3, in the detection mode, the operation process of the pixel circuit includes an initialization phase t11, a data writing phase t12, and a detection phase t13.
In the initialization stage T11, the second Scan signal input terminal Scan2 inputs a low level, the sixth transistor T6 and the seventh transistor T7 are turned on, the initialization voltage input by the initialization voltage input terminal Vref is transmitted to the gate of the driving transistor DT through the sixth transistor T6, and the initialization voltage input by the initialization voltage input terminal Vref is transmitted to the first electrode of the light emitting device D1 through the seventh transistor T7, so that the initialization of the gate of the driving transistor DT and the first electrode of the light emitting device D1 is realized.
In the Data writing phase T12, the first Scan signal input terminal Scan1 inputs a low level, the first transistor T1 and the second transistor T2 are turned on, and the initial Data voltage signal input from the Data voltage signal input terminal Data is transmitted to the gate electrode of the driving transistor DT through the turned-on first transistor T1, the driving transistor DT and the third transistor T3. Due to the existence of the threshold voltage of the driving transistor DT, in the process, a certain voltage drop is generated when the initial data voltage signal passes through the driving transistor DT, and the voltage drop passing through the driving transistor DT may be different under different preset gray scales (each preset gray scale corresponds to one initial data voltage signal, so that the initial data voltage signals are different), so that a certain difference value exists between the gate potential of the driving transistor DT and the initial data voltage signal.
In the detection phase T13, the detection control signal input terminal Sense1 inputs a low level, the third transistor T3 is turned on, and the gate potential of the driving transistor DT is output through the third transistor T3. Because of the influence of the difference between the threshold voltage of the driving transistor DT and the preset gray scale, the voltage drop of the initial data voltage signal after passing through the driving transistor DT may be different, and the initial data voltage signal is output to the driving chip after the detection of the gate potential of the driving transistor DT by the third transistor T3, so that the driving chip adjusts the data voltage signal corresponding to the preset gray scale according to the difference between the initial data voltage signal and the gate potential of the driving transistor DT, that is, the data voltage signal corresponding to the preset gray scale is adjusted from the initial data voltage signal to the update data voltage signal, the update data voltage signal is positively correlated with the initial data voltage signal, the update data voltage signal is positively correlated with the first difference, and the first difference is the difference between the initial data voltage signal and the gate potential of the driving transistor DT, thereby improving the display uniformity.
Alternatively, in the entire detection mode, the emission control signal input terminal EM may input a high level, and the fourth transistor T4 and the fifth transistor T5 are turned off.
Referring to fig. 2 and 4, in the display mode, the operation process of the pixel circuit includes an initialization phase t21, a data writing phase t22, and a light emitting phase t23.
In the initialization stage T21, the second Scan signal input terminal Scan2 inputs a low level, the sixth transistor T6 and the seventh transistor T7 are turned on, the initialization voltage input by the initialization voltage input terminal Vref is transmitted to the gate of the driving transistor DT through the sixth transistor T6, and the initialization voltage input by the initialization voltage input terminal Vref is transmitted to the first electrode of the light emitting device D1 through the seventh transistor T7, so that the initialization of the gate of the driving transistor DT and the first electrode of the light emitting device D1 is realized.
In the Data writing phase T22, the first Scan signal input terminal Scan1 inputs a low level, the first transistor T1 and the second transistor T2 are turned on, and the update Data voltage signal input from the Data voltage signal input terminal Data is transmitted to the gate electrode of the driving transistor DT through the turned-on first transistor T1, the driving transistor DT and the third transistor T3.
In the light emitting period T23, the light emitting control signal input terminal EM inputs a low level, the fourth transistor T4 and the fifth transistor T5 are turned on, and the driving transistor DT generates a driving current according to the gate potential of the driving transistor DT to drive the light emitting device D1 to emit light.
Alternatively, in the entire display mode, the sensing control signal input terminal Sense1 may input a high level, and the third transistor T3 is turned off. That is, in the display mode, the gate potential of the driving transistor DT is not detected.
Fig. 5 is a schematic structural diagram of another pixel circuit provided in an embodiment of the present invention, where the pixel circuit may correspond to a specific component circuit of the pixel circuit shown in fig. 1, and referring to fig. 5, the data writing module 110 includes a first transistor T1, the threshold compensation module 120 includes a second transistor T2, the gate potential detection module 130 includes a third transistor T3, the first light emission control unit 141 includes a fourth transistor T4, the second light emission control unit 142 includes a fifth transistor T5, the storage module 160 includes a storage capacitor Cst, and the light emission module 150 includes a light emitting device D1.
With continued reference to fig. 5, optionally, the pixel circuit further includes a sixth transistor T6, wherein a gate of the sixth transistor T6 is electrically connected to the second Scan signal input terminal Scan2, a first pole of the sixth transistor T6 is electrically connected to the initialization voltage input terminal Vref, a second pole of the sixth transistor T6 is electrically connected to the gate of the driving transistor DT, and the sixth transistor T6 is configured to be turned on during the initialization phase to transmit the initialization voltage to the gate of the driving transistor DT. Optionally, the pixel circuit further includes a seventh transistor T7, wherein a gate of the seventh transistor T7 is electrically connected to the second Scan signal input terminal Scan2, a first pole of the seventh transistor T7 is electrically connected to the initialization voltage input terminal Vref, a second pole of the seventh transistor T7 is electrically connected to the first pole of the light emitting device D1, and the seventh transistor T7 is configured to be turned on in the initialization phase to transmit the initialization voltage to the first pole of the light emitting device D1. In this embodiment, each transistor may be a P-type transistor or an N-type transistor, and the pixel circuit shown in fig. 5 shows a case where each transistor is an N-type transistor, and the following description will be given by taking an example where a transistor included in the pixel circuit is an N-type transistor.
Fig. 6 is a driving timing diagram of another pixel circuit provided in an embodiment of the invention in a detection mode, fig. 7 is a driving timing diagram of another pixel circuit provided in an embodiment of the invention in a display mode, and the driving timing diagrams shown in fig. 6 and 7 can be used for driving the pixel circuit shown in fig. 5.
Referring to fig. 5 and 6, in the detection mode, the operation process of the pixel circuit includes an initialization phase t11, a data writing phase t12, and a detection phase t13.
In the initialization stage T11, the second Scan signal input terminal Scan2 inputs a high level, the sixth transistor T6 and the seventh transistor T7 are turned on, the initialization voltage input by the initialization voltage input terminal Vref is transmitted to the gate of the driving transistor DT through the sixth transistor T6, and the initialization voltage input by the initialization voltage input terminal Vref is transmitted to the first electrode of the light emitting device D1 through the seventh transistor T7, so that the initialization of the gate of the driving transistor DT and the first electrode of the light emitting device D1 is realized.
In the Data writing period T12, the first Scan signal input terminal Scan1 inputs a high level, the first transistor T1 and the second transistor T2 are turned on, and the initial Data voltage signal input by the Data voltage signal input terminal Data is transmitted to the gate electrode of the driving transistor DT through the turned-on first transistor T1, the driving transistor DT, and the third transistor T3. Due to the existence of the threshold voltage of the driving transistor DT, in the process, a certain voltage drop may be generated when the initial data voltage signal passes through the driving transistor DT, and the voltage drop passing through the driving transistor DT may be different under different preset gray scales (each preset gray scale corresponds to one initial data voltage signal, so that the initial data voltage signals are different), so that a certain difference value may exist between the gate potential of the driving transistor DT and the initial data voltage signal.
In the detection phase T13, the detection control signal input terminal Sense1 inputs a high level, the third transistor T3 is turned on, and the gate potential of the driving transistor DT is output through the third transistor T3. Because of the influence of the difference between the threshold voltage of the driving transistor DT and the preset gray scale, the voltage drop of the initial data voltage signal after passing through the driving transistor DT may be different, and the initial data voltage signal is output to the driving chip after the detection of the gate potential of the driving transistor DT by the third transistor T3, so that the driving chip adjusts the data voltage signal corresponding to the preset gray scale according to the difference between the initial data voltage signal and the gate potential of the driving transistor DT, that is, the data voltage signal corresponding to the preset gray scale is adjusted from the initial data voltage signal to the update data voltage signal, the update data voltage signal is positively correlated with the initial data voltage signal, the update data voltage signal is positively correlated with the first difference, and the first difference is the difference between the initial data voltage signal and the gate potential of the driving transistor DT, thereby improving the display uniformity.
Alternatively, in the entire detection mode, the emission control signal input terminal EM may input a low level, and the fourth transistor T4 and the fifth transistor T5 are turned off.
Referring to fig. 5 and 7, in the display mode, the operation process of the pixel circuit includes an initialization phase t21, a data writing phase t22, and a light emitting phase t23.
In the initialization stage T21, a high level is input to the second Scan signal input terminal Scan2, the sixth transistor T6 and the seventh transistor T7 are turned on, the initialization voltage input from the initialization voltage input terminal Vref is transmitted to the gate of the driving transistor DT through the sixth transistor T6, and the initialization voltage input from the initialization voltage input terminal Vref is transmitted to the first electrode of the light emitting device D1 through the seventh transistor T7, so that the initialization of the gate of the driving transistor DT and the first electrode of the light emitting device D1 is realized.
In the Data writing phase T22, the first Scan signal input terminal Scan1 inputs a high level, the first transistor T1 and the second transistor T2 are turned on, and the update Data voltage signal input from the Data voltage signal input terminal Data is transmitted to the gate electrode of the driving transistor DT through the turned-on first transistor T1, the driving transistor DT and the third transistor T3.
In the light emitting period T23, the light emitting control signal input terminal EM inputs a high level, the fourth transistor T4 and the fifth transistor T5 are turned on, and the driving transistor DT generates a driving current according to the gate potential of the driving transistor DT to drive the light emitting device D1 to emit light.
Alternatively, in the entire display mode, the sensing control signal input terminal Sense1 may input a low level, and the third transistor T3 is turned off. That is, in the display mode, the gate potential of the driving transistor DT is not detected.
It should be noted that, the above embodiments have been described with the operation process of the pixel circuit including the sixth transistor T6 and the seventh transistor T7, the pixel circuit may not include the sixth transistor T6 and the seventh transistor T7, when the pixel circuit does not include the sixth transistor T6 and the seventh transistor T7, the detection mode only includes the data writing phase T22 and the detection phase, and the display mode only includes the data writing phase T22 and the light emitting phase T23.
Optionally, for any preset gray scale, the sum of the first difference value equal to the updated data voltage signal and the initial data voltage signal.
Specifically, for any pixel circuit, after the initial data voltage signal is written into the gate of the driving transistor through the driving transistor and the threshold voltage compensation module, the gate potential of the driving transistor is different from the initial data voltage signal. Wherein the difference of the initial data voltage signal and the gate potential of the driving transistor, i.e. the first difference Δ V, may be represented as Δ V = Vdata1-Vdata2, where Vdata1 represents the initial data voltage signal and Vdata2 represents the gate potential of the driving transistor. That is, after the initial data voltage signal is written into the gate of the driving transistor, the voltage will drop by the first difference Δ V due to the influence of the threshold voltage and the display gray scale of the driving transistor. In this embodiment, the update data voltage signal is equal to the sum of the difference between the initial data voltage signal and the gate potential of the driving transistor and the initial data voltage, that is, vdata3= Vdata1+ Δ V, so that the update data voltage signal takes into account the voltage drop Δ V written to the gate of the driving transistor by the driving transistor and the compensation module in advance, and the voltage of the update data voltage signal after passing through the driving transistor and the threshold voltage compensation module is Vdata3- Δ V = Vdata1+ Δ V- Δ V = Vdata1, so that even for different pixel circuits, the voltage drops of the data voltage signal (which may be the initial voltage signal or the update data voltage signal) under the same preset gray scale passing through the driving transistor and the threshold voltage compensation module are different, and because the voltage drops are included in the update data voltage, the voltages reaching the gate of the driving transistor are the initial data voltage signals corresponding to the preset gray scale for different pixel circuits, so that the gate potentials of the driving transistors are the same, thereby facilitating to improve the display uniformity of the display panel.
On the basis of the above technical solution, optionally, the preset gray scale includes a gray scale of 0-192.
Specifically, as described in the background art, since the driving transistor DT operates in the linear region in the low gray scale, the pixel circuit cannot compensate the threshold voltage of the driving transistor. The gray levels 0 to 192 belong to the lower gray level range, and the preset gray levels are set to include the gray levels 0 to 192, that is, the initial data voltage signals corresponding to the gray levels 0 to 192 are respectively adjusted to the corresponding update data voltage signals, so as to improve the brightness uniformity of the display panel under the low gray level.
It should be noted that the preset gray levels include 0-192 gray levels suitable for 8-bit display panels, i.e., the displayable gray level range is 0-255 gray levels of the display panel. For the higher or lower display panel, the ratio of the preset gray scale to the total displayable gray scale in the present embodiment may be referred to for determination.
Optionally, the preset gray scale includes the whole gray scale range capable of being displayed.
Specifically, the preset gray scale includes the whole displayable gray scale range, and the whole displayable gray scale range necessarily includes the low gray scale, so that the brightness uniformity under the low gray scale can be improved by setting the preset gray scale including the whole displayable gray scale range. In addition, in other gray scale ranges except for the low gray scale, the updated data voltage signal can be obtained according to the initial data voltage signal corresponding to the gray scale and the sum of the difference values of the initial data voltage signal and the detected grid potential of the driving transistor, and in the data writing stage in the display mode, the updated data voltage signal corresponding to the other gray scale is written into the grid of the driving transistor through the data writing module, so that the brightness uniformity of the other gray scale is further improved.
Optionally, the preset gray scale includes a whole gray scale range or a gamma binding gray scale which can be displayed.
The gamma binding gray scales can be selected partial gray scales in the whole gray scale range during gamma debugging, and are optional, the gamma binding gray scales are uniformly distributed in the whole gray scale range, or the number of the gamma binding gray scales in the low gray scale range of the gamma binding gray scales is more than that of the gamma binding gray scales in the high gray scale range. For example, for an 8-bit display panel, the 0-192 gray scale is in the low gray scale range, and the 193-255 gray scale is in the high gray scale range. When the preset gray scale includes the gamma binding gray scale, the display panel including the pixel circuit of the embodiment further includes that the driving chip obtains first difference values corresponding to other gray scales except the gamma binding gray scale according to the first difference values corresponding to the gamma binding gray scales, so as to obtain the update data voltage signals corresponding to the gray scales except the gamma binding gray scale.
This embodiment further provides a driving method of a pixel circuit, where the driving method can be used to drive the pixel circuit provided in any of the above embodiments of the present invention, fig. 8 is a flowchart of the driving method of the pixel circuit provided in the embodiment of the present invention, and referring to fig. 8, the driving method of the pixel circuit includes:
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and the gate potential of the driving transistor.
In the driving method of the pixel circuit provided in this embodiment, the gate potential of the driving transistor is detected and output by the gate potential detecting module at the detection stage in the detection mode, and the data writing module writes the update data voltage signal corresponding to the preset gray scale into the gate of the driving transistor at the data writing stage in the display mode; the threshold compensation module writes a compensation signal containing the threshold voltage information of the driving transistor into the grid electrode of the driving transistor; the update data voltage signal is positively correlated with the initial data voltage signal and positively correlated with the first difference. The updated data voltage signal is obtained by considering the voltage drop possibly generated when the updated data voltage signal is written into the grid electrode of the driving transistor in advance, namely, the larger the first difference value is, the larger the updated data voltage signal is, so that the situation that the threshold voltage of the driving transistor cannot be completely compensated is fully considered, so that even if the threshold voltages of the driving transistors corresponding to different pixel circuits are different, under the same preset gray scale, the updated data voltage signals corresponding to different pixel circuits are written into the grid electrodes of the respective driving transistors, and the inconsistent degree of the grid electrode potentials of the driving transistors caused by the different voltage drops of the driving transistors is also reduced, thereby being beneficial to improving the display uniformity of the display panel and reducing the occurrence of ghost shadow. And the updating data voltage signal is positively correlated with the initial voltage signal, and the positive correlation between the updating data voltage signal and the initial data voltage signal can ensure that the trend of the updating data voltage signal changing along with the preset gray scale is consistent with the trend of the initial data voltage signal changing along with the preset gray scale, and the normal display of the display panel is ensured.
Fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present invention, referring to fig. 9, the display panel includes a pixel circuit 310, a driving chip 120, a plurality of detection signal lines (Z1, Z2, Z3, Z4 … …) electrically connected to the driving chip 120, and a plurality of data lines (D1, D2, D3, D4 … …) electrically connected to the driving chip 120, each detection signal line is connected to a gate potential detection module of a row of pixel circuits, and each data line is connected to a data writing module of a row of pixel circuits;
the driving chip 120 is configured to output an initial data voltage signal corresponding to a preset gray scale to the data line at a data writing stage in the detection mode, so that the driving transistor gates of the pixel circuits in the display panel write the initial data voltage signal line by line;
the driving chip 120 is further configured to, at a detection stage in the detection mode, obtain, line by line, a gate potential of a driving transistor output by a gate potential detection module in a pixel circuit, and determine, for each pixel circuit, an update data voltage signal according to a difference between an initial data voltage signal and the gate potential of the driving transistor and the initial data voltage signal;
the driving chip 120 is further configured to output an update data voltage signal corresponding to a preset gray scale to the data line at a data writing stage in the display mode when the to-be-displayed gray scale corresponding to the pixel circuit connected to the data line is the preset gray scale;
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and the gate potential of the driving transistor.
Optionally, the driving chip 120 is specifically configured to determine, as the updated data voltage signal, a sum of the first difference and the initial data voltage signal for any preset gray scale.
Referring to fig. 9, the display panel further includes a plurality of scan lines (S1, S2, S3, S4 … …), each of which may be connected to a row of pixel circuits, wherein the display panel shown in fig. 9 may correspond to the display panel structure including the pixel circuits shown in fig. 1.
In the display panel provided by this embodiment, the gate potential of the driving transistor output by the gate potential detection module in the pixel circuit is obtained line by line at the detection stage of the driving chip in the detection mode, and for each pixel circuit, the update data voltage signal is determined according to the difference between the initial data voltage signal and the gate potential of the driving transistor and the initial data voltage signal; and when the gray scale to be displayed corresponding to the pixel circuit connected with the data line is the preset gray scale, in the data writing stage under the display mode, the updating data voltage signal corresponding to the preset gray scale is output to the data line, so that even if the threshold voltages of the driving transistors corresponding to different pixel circuits are different, the updating data voltage signals corresponding to different pixel circuits are written into the grid electrodes of the respective driving transistors under the same preset gray scale, the inconsistent degree of the grid electrode potentials of the driving transistors caused by different voltage drops of the driving transistors is reduced, and the brightness uniformity of the display panel is improved.
Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 10, optionally, data lines are multiplexed into detection signal lines.
Specifically, the detection signal line and the data line are both connected to a row of pixel circuits, and the detection mode and the display mode of the display panel are two working modes of the display panel and can be performed at different times, so that the data line can be multiplexed into the detection signal line, and the driving chip outputs an initial data voltage signal and transmits the initial data voltage signal to the corresponding pixel circuit through the data line in the data writing stage in the detection mode; in the detection stage of the detection mode, the driving chip detects the gate potential of the driving transistor of the pixel circuit through the data line, and in combination with the pixel circuit shown in fig. 1 and 2, the data line is electrically connected to the data voltage signal input terminal and is also electrically connected to the second terminal of the gate potential detection module. The display panel of the embodiment can detect the grid potential of the driving transistor without additionally adding wires in the display panel, thereby being beneficial to simplifying the wiring of the display panel.
With continued reference to fig. 10, the display panel shown in fig. 10 may correspond to a display panel structure including the pixel circuits shown in fig. 2, and each row of pixel circuits may be connected to two scan lines, where the first row of pixel circuits may be respectively connected to the first scan line S1 and the last scan line (not shown in the figure).
An embodiment of the present invention further provides a driving method of a display panel, where the driving method can be used to drive the display panel provided in any of the above embodiments of the present invention, fig. 11 is a flowchart of the driving method of the display panel provided in the embodiment of the present invention, and referring to fig. 11, the driving method of the display panel includes:
the update data voltage signal is positively correlated with the initial data voltage signal, and the update data voltage signal is positively correlated with a first difference value, wherein the first difference value is a difference value between the initial data voltage signal and a gate potential of the driving transistor.
In the driving method of the display panel provided in this embodiment, the gate potentials of the driving transistors output by the gate potential detection module in the pixel circuits are obtained line by line at the detection stage in the detection mode, and for each pixel circuit, the update data voltage signal is determined according to the difference between the initial data voltage signal and the gate potentials of the driving transistors and the initial data voltage signal; and when the gray scale to be displayed corresponding to the pixel circuit connected with the data line is the preset gray scale, in the data writing stage under the display mode, the updating data voltage signal corresponding to the preset gray scale is output to the data line, so that even if the threshold voltages of the driving transistors corresponding to different pixel circuits are different, the updating data voltage signals corresponding to different pixel circuits are written into the grid electrodes of the respective driving transistors under the same preset gray scale, the inconsistent degree of the grid electrode potentials of the driving transistors caused by different voltage drops of the driving transistors is reduced, and the brightness uniformity of the display panel is improved.
Optionally, the display mode and the detection mode are performed at different times, and a time interval between two adjacent detection modes is equal to a preset time threshold.
Specifically, as the service time is prolonged, the properties of the driving transistors in each pixel circuit may change, and correspondingly, as the service time is prolonged, after the same initial data voltage signal is written into the gate of the driving transistor in the same pixel circuit, the difference between the initial data voltage signal and the gate potential of the driving transistor may change, so that the detection mode may be started at intervals, and then the updated data voltage signal corresponding to the preset gray scale may be obtained at intervals, which is more favorable for improving the display uniformity of the display panel. The preset time threshold value can be set according to actual needs.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. A pixel circuit, comprising: the device comprises a data writing module, a threshold compensation module, a driving transistor and a grid electrode potential detection module;
the data writing module is used for writing an initial data voltage signal corresponding to a preset gray scale into the grid electrode of the driving transistor at a data writing stage in a detection mode;
the threshold compensation module is used for writing a compensation signal containing threshold voltage information of the driving transistor into a grid electrode of the driving transistor in a data writing stage under a detection mode and a display mode;
the grid electrode potential detection module is used for detecting and outputting the grid electrode potential of the driving transistor at a detection stage in a detection mode;
the data writing module is also used for writing an update data voltage signal corresponding to a preset gray scale into the grid electrode of the driving transistor at a data writing stage in a display mode;
wherein the update data voltage signal is positively correlated with the initial data voltage signal, the update data voltage signal is positively correlated with a first difference value, the first difference value being a difference value of the initial data voltage signal and the gate potential of the driving transistor;
the initial data voltage signals correspond to the preset gray scales one by one, and the change trend of the update data voltage signals along with the preset gray scales is consistent with the change trend of the initial data voltage signals along with the preset gray scales.
2. The pixel circuit according to claim 1, wherein the updated data voltage signal is equal to a sum of the first difference and the initial data voltage signal for any predetermined gray level.
3. The pixel circuit according to claim 1, further comprising a light emission control module, a light emitting module, and a storage module, wherein the light emission control module is configured to control a first pole of the driving transistor to be turned off from a first power voltage input terminal and a second pole of the driving transistor to be turned off from the light emitting module during a data writing phase in the detection mode and the display mode; and in a light emitting stage in a display mode, controlling the conduction between the first pole of the driving transistor and the first power voltage input end, and controlling the conduction between the second pole of the driving transistor and the light emitting module; the storage module is used for keeping the grid potential of the driving transistor;
the driving transistor is used for generating a driving signal according to the voltage of the grid electrode of the driving transistor and the voltage of the first electrode of the driving transistor in a light-emitting stage under a display mode and driving the light-emitting module to emit light.
4. The pixel circuit according to claim 3, wherein the control terminal of the data writing module is electrically connected to a first scan signal input terminal, the first terminal of the data writing module is electrically connected to a data voltage signal input terminal, and the second terminal of the data writing module is electrically connected to the first pole of the driving transistor;
a control end of the threshold compensation module is electrically connected with the first scanning signal input end, a first end of the threshold compensation module is electrically connected with the second pole of the driving transistor, and a second end of the threshold compensation module is electrically connected with the grid electrode of the driving transistor;
the control end of the grid potential detection module is electrically connected with the detection control signal input end, the first end of the grid potential detection module is electrically connected with the grid of the driving transistor, and the second end of the grid potential detection module is used for outputting the detected grid potential;
the light-emitting control module comprises a first light-emitting control unit and a second light-emitting control unit, the first light-emitting control unit is connected between the first power voltage input end and the first pole of the driving transistor, the second light-emitting control unit is connected between the second pole of the driving transistor and the first pole of the light-emitting module, and the control end of the first light-emitting control unit and the control end of the second light-emitting control unit are both electrically connected with a light-emitting control signal input end;
and the second pole of the light-emitting module is electrically connected with the second power supply voltage input end.
5. The pixel circuit of claim 1, wherein the predetermined gray scale comprises a gray scale of 0-192.
6. The pixel circuit of claim 1, wherein the predetermined gray level comprises an entire gray level range or a gamma binding gray level that can be displayed.
7. A driving method of a pixel circuit for driving the pixel circuit according to any one of claims 1 to 6, comprising:
in a data writing stage in a detection mode, a data writing module writes an initial data voltage signal corresponding to a preset gray scale into a grid electrode of the driving transistor; the threshold compensation module writes a compensation signal containing threshold voltage information of the driving transistor into a grid electrode of the driving transistor;
in a detection stage in a detection mode, a grid potential detection module detects and outputs the grid potential of the driving transistor;
in a data writing stage in a display mode, the data writing module writes an update data voltage signal corresponding to a preset gray scale into a grid electrode of the driving transistor; the threshold compensation module writes a compensation signal containing threshold voltage information of the driving transistor into a grid electrode of the driving transistor;
wherein the update data voltage signal is positively correlated with the initial data voltage signal, the update data voltage signal is positively correlated with a first difference value, the first difference value being a difference value of the initial data voltage signal and the gate potential of the driving transistor;
the initial data voltage signals correspond to the preset gray scales one by one, and the change trend of the update data voltage signals along with the preset gray scales is consistent with the change trend of the initial data voltage signals along with the preset gray scales.
8. A display panel, comprising the pixel circuit of any one of claims 1 to 6, further comprising a driving chip, a plurality of detection signal lines electrically connected to the driving chip, and a plurality of data lines electrically connected to the driving chip, wherein each of the detection signal lines is connected to the gate potential detection modules of one row of the pixel circuits, and each of the data lines is connected to the data writing modules of one row of the pixel circuits;
the driving chip is used for outputting an initial data voltage signal corresponding to a preset gray scale to the data line in a data writing stage in a detection mode so as to write the initial data voltage signal into the grid electrode of the driving transistor of the pixel circuit in the display panel line by line;
the driving chip is also used for acquiring the grid potential of the driving transistor output by the grid potential detection module in the pixel circuit line by line at the detection stage in the detection mode, and for each pixel circuit, determining an updated data voltage signal according to the difference value between the initial data voltage signal and the grid potential of the driving transistor and the initial data voltage signal;
the driving chip is also used for outputting an update data voltage signal corresponding to a preset gray scale to the data line at a data writing stage in a display mode when the to-be-displayed gray scale corresponding to the pixel circuit connected with the data line is the preset gray scale;
wherein the update data voltage signal is positively correlated with the initial data voltage signal, the update data voltage signal is positively correlated with a first difference value, the first difference value being a difference value of the initial data voltage signal and the gate potential of the driving transistor.
9. A driving method of a display panel for driving the display panel according to claim 8, comprising:
outputting an initial data voltage signal corresponding to a preset gray scale to the data line in a data writing stage in a detection mode so as to write the initial data voltage signal into the grid electrodes of the driving transistors of the pixel circuits in the display panel line by line;
in a detection stage in a detection mode, acquiring the grid potential of a driving transistor output by a grid potential detection module in the pixel circuit line by line, and determining an updated data voltage signal for each pixel circuit according to the difference value of the initial data voltage signal and the grid potential of the driving transistor and the initial data voltage signal;
when the gray scale to be displayed corresponding to the pixel circuit connected with the data line is a preset gray scale, outputting an update data voltage signal corresponding to the preset gray scale to the data line in a data writing stage in a display mode;
wherein the update data voltage signal is positively correlated with the initial data voltage signal, the update data voltage signal is positively correlated with a first difference value, the first difference value being a difference value of the initial data voltage signal and the gate potential of the driving transistor;
the initial data voltage signals correspond to the preset gray scales one by one, and the change trend of the update data voltage signals along with the preset gray scales is consistent with the change trend of the initial data voltage signals along with the preset gray scales.
10. The method according to claim 9, wherein the display mode and the detection mode are performed at different times, and a time interval between two adjacent detection modes is equal to a predetermined time threshold.
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| CN114267298A (en) * | 2021-12-16 | 2022-04-01 | Tcl华星光电技术有限公司 | Pixel driving circuit and display panel |
| CN116631340A (en) * | 2022-02-10 | 2023-08-22 | 北京小米移动软件有限公司 | Pixel unit, display panel, pixel unit compensation method and device |
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