CN111489703B - Pixel circuit, driving method thereof and display panel - Google Patents
Pixel circuit, driving method thereof and display panel Download PDFInfo
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- CN111489703B CN111489703B CN201910087526.0A CN201910087526A CN111489703B CN 111489703 B CN111489703 B CN 111489703B CN 201910087526 A CN201910087526 A CN 201910087526A CN 111489703 B CN111489703 B CN 111489703B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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Abstract
The invention discloses a pixel circuit, a driving method thereof and a display panel, wherein the pixel circuit comprises a data voltage writing module, a storage module, a driving module, an organic light-emitting device and an initialization module; the initialization module comprises a control end, an input end and an output end, wherein the control end of the initialization module is electrically connected with the first scanning signal input end of the pixel circuit, the input end of the initialization module is electrically connected with the cathode of the organic light-emitting device, and the output end of the initialization module is electrically connected with the anode of the organic light-emitting device, the control end of the driving module and the storage module; the initialization voltage of the pixel circuit is not required to be provided by a driving chip of the display panel, voltage generators for providing the initialization voltage in the driving chip are reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, the structure of the display panel is simplified, wiring of the display panel is facilitated, and pixel density is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a driving method thereof and a display panel.
Background
With the development of display technology, organic light emitting display panels are increasingly widely used due to their characteristics of fast response speed, high contrast, wide viewing angle, and the like.
The organic light emitting display panel includes a pixel circuit for driving the organic light emitting device to emit light. The pixel circuit usually includes a capacitor and a plurality of thin film transistors, and the driving chip is connected with the gate of each thin film transistor through a signal line, so as to control the on/off of the thin film transistor, and further control the working timing sequence of the pixel circuit.
However, in the conventional display panel and pixel circuit structure, the driving chip is required to include a plurality of interfaces, and each interface is connected to the pixel circuit through a metal lead, so that the number of metal leads in the display panel is too large, and the wiring of the display panel is complicated.
Disclosure of Invention
The invention provides a pixel circuit, a driving method thereof and a display panel, which aim to reduce driving chip interfaces and metal leads in the display panel and simplify wiring of the display panel.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including a data voltage writing module, a storage module, a driving module, an organic light emitting device, and an initialization module;
the data voltage writing module is used for writing data voltage into the driving module;
the storage module is used for storing data voltage;
the driving module is used for driving the organic light-emitting device to emit light according to the data voltage;
the anode of the organic light-emitting device is electrically connected with the driving module, and the cathode of the organic light-emitting device is electrically connected with the first voltage signal input end of the pixel circuit;
the initialization module comprises a control end, an input end and an output end, wherein the control end of the initialization module is electrically connected with the first scanning signal input end of the pixel circuit, the input end of the initialization module is electrically connected with the cathode of the organic light-emitting device, the output end of the initialization module is electrically connected with the anode of the organic light-emitting device, and is also electrically connected with the control end of the driving module and the storage module.
The initialization module comprises a first transistor and a second transistor, and the output end of the initialization module comprises a first output end and a second output end; a grid electrode of the first transistor is electrically connected with a first scanning signal input end, a first pole of the first transistor is electrically connected with a cathode of the organic light-emitting device, and a second pole of the first transistor is used as a first output end of the initialization module and is electrically connected with an anode of the organic light-emitting device; the grid electrode of the second transistor is electrically connected with the first scanning signal input end, the first electrode of the second transistor is electrically connected with the second electrode of the first transistor, and the second electrode of the second transistor is used as the second output end of the initialization module and is electrically connected with the control end of the driving module.
The data writing module comprises a third transistor, the storage module comprises a capacitor, and the driving module comprises a fourth transistor;
a grid electrode of the third transistor is electrically connected with the second scanning signal input end of the pixel circuit, a first pole of the third transistor is electrically connected with the data voltage input end of the pixel circuit, a second pole of the third transistor is electrically connected with a grid electrode of the fourth transistor, a first pole of the fourth transistor is electrically connected with the second voltage signal input end of the pixel circuit, and a second pole of the fourth transistor is electrically connected with an anode of the organic light-emitting device;
the first end of the capacitor is electrically connected with the second voltage signal input end, and the second end of the capacitor is electrically connected with the grid electrode of the fourth transistor.
The pixel circuit further comprises a fifth transistor, a grid electrode of the fifth transistor is electrically connected with a light-emitting control signal input end of the pixel circuit, and a second pole of the fourth transistor is electrically connected with an anode of the organic light-emitting device through the fifth transistor.
The first scanning signal input end is electrically connected with the scanning line of the (n-1) th row, the second scanning signal input end is electrically connected with the scanning line of the (n) th row, wherein n is more than or equal to 1 and less than or equal to m, and m is the total row number of the pixels.
The pixel circuit also comprises a compensation module and a light-emitting control module, wherein the compensation module is used for compensating the data voltage written into the driving module; the light emitting control module is used for controlling a driving signal to be input into the organic light emitting device so as to control the organic light emitting device to emit light.
The initialization module comprises a sixth transistor, the data voltage writing module comprises a seventh transistor, the driving module comprises an eighth transistor, the compensation module comprises a ninth transistor, and the light-emitting control module comprises a tenth transistor and an eleventh transistor;
a grid electrode of the sixth transistor is electrically connected with the first scanning signal input end, a first electrode of the sixth transistor is electrically connected with a cathode of the organic light-emitting device, and a second electrode of the sixth transistor is electrically connected with an anode of the organic light-emitting device;
a gate of the seventh transistor is electrically connected to the second scan signal input terminal of the pixel circuit, a first pole of the seventh transistor is electrically connected to the data voltage input terminal, and a second pole of the seventh transistor is electrically connected to the first pole of the eighth transistor;
a first electrode of the eighth transistor is electrically connected with a second electrode of the tenth transistor, a first electrode of the tenth transistor is electrically connected with a second voltage signal input end of the pixel circuit, and a grid electrode of the tenth transistor is electrically connected with a first light-emitting control signal input end of the pixel circuit; a second pole of the eighth transistor is electrically connected with the first pole of the eleventh transistor, a second pole of the eleventh transistor is electrically connected with the anode of the organic light-emitting device, and a gate of the eleventh transistor is electrically connected with the second light-emitting control signal input end of the pixel circuit;
a gate of the ninth transistor is electrically connected to the first control signal input terminal of the pixel circuit, a first pole of the ninth transistor is electrically connected to a gate of the eighth transistor, and a second pole of the ninth transistor is electrically connected to the second pole of the eighth transistor.
The initialization module further comprises a twelfth transistor, wherein the grid electrode of the twelfth transistor is electrically connected with the first scanning signal input end, the first pole of the twelfth transistor is electrically connected with the second pole of the sixth transistor, and the second pole of the twelfth transistor is electrically connected with the grid electrode of the eighth transistor.
The first light-emitting control signal input end and the second light-emitting control signal input end are electrically connected with the same light-emitting control line, and the second scanning signal input end and the first control signal input end are electrically connected with the same scanning line.
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 the initialization stage, the initialization module is switched on, the data voltage writing module is switched off, and a first voltage input by the first voltage input signal input end is written into the anode of the organic light-emitting device, the control end of the driving module and the storage module through the switched-on initialization module;
in the data writing stage, the data voltage writing module is switched on, the initialization module is switched off, and the data voltage is written into the driving module;
and in the light emitting stage, the driving module is conducted and drives the organic light emitting device to emit light according to the data voltage.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit provided in the first aspect.
The invention provides a pixel circuit, a driving method thereof and a display panel.A pixel circuit has the advantages that the input end of an initialization module is electrically connected with the cathode of an organic light-emitting device, the output end of the initialization module is electrically connected with the anode of the organic light-emitting device, and the control end of a driving module is electrically connected with a storage module, so that the initialization voltage of the pixel circuit is not required to be provided by a driving chip of the display panel, a voltage generator for providing the initialization voltage in the driving chip is reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, the structure of the display panel is simplified, the wiring of the display panel is facilitated, and the pixel density is improved.
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 schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating an operation of a pixel circuit 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 timing diagram illustrating an operation of another pixel circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 9 is a timing diagram illustrating operation of another pixel circuit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another pixel circuit according to an embodiment of the invention;
FIG. 11 is a timing diagram illustrating operation of another pixel circuit according to an embodiment of the present invention;
fig. 12 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram 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 limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a pixel circuit provided in an embodiment of the present invention, where the pixel circuit includes a data voltage writing module 110, a storage module 120, a driving module 130, an organic light emitting device 140, and an initialization module 150;
the data voltage writing module 110 is configured to write a data voltage to the driving module;
the storage module 120 is used for storing data voltages;
the driving module 130 is used for driving the organic light emitting device to emit light according to the data voltage;
the anode of the organic light emitting device 140 is electrically connected to the driving module, and the cathode of the organic light emitting device is electrically connected to the first voltage signal input terminal Vss of the pixel circuit;
the initialization module 150 includes a control terminal, an input terminal, and an output terminal, the control terminal of the initialization module 150 is electrically connected to the first scan signal input terminal Sn-1 of the pixel circuit, the input terminal of the initialization module 150 is electrically connected to the cathode of the organic light emitting device, and the output terminal of the initialization module is electrically connected to the anode of the organic light emitting device, and is also electrically connected to the control terminal of the driving module 130 and the memory module 120.
Specifically, the operation process of the pixel circuit may include an initialization phase, a data writing phase, and a light emitting phase. In the initialization stage, the first scan signal input terminal Sn-1 inputs a scan signal to the control terminal of the initialization module 150, so that the initialization module 150 is turned on, and the voltages of the anode of the organic light emitting device 140, the control terminal of the driving module 130 and one end of the storage module 120 connected to the output terminal of the initialization module 150 are forced to be initialization voltages, thereby ending the light emitting state of the organic light emitting device 140 in the previous frame, improving the inconsistency of the light emitting brightness caused by the gate voltage jump of the driving transistor, improving the uniformity of display, avoiding the malfunction of the pixel circuit and reducing the power consumption; in addition, the initialization voltage is the voltage of the cathode of the organic light emitting device 140, and the driving chip of the display panel is not required to provide the initialization voltage, so that voltage generators for providing the initialization voltage in the driving chip are reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, and the structure of the display panel is simplified. In the data writing phase, the data voltage writing module 110 is turned on, and the data voltage is written into the control terminal of the driving module 130; the memory module 120 may store the written data voltage; the driving module 130 may drive the organic light emitting device 140 to emit light according to the data voltage during the light emitting period.
According to the pixel circuit provided by the embodiment of the invention, the input end of the initialization module is electrically connected with the cathode of the organic light-emitting device, the output end of the initialization module is electrically connected with the anode of the organic light-emitting device, and the control end of the driving module is electrically connected with the storage module, so that the initialization voltage of the pixel circuit is not required to be provided by the driving chip of the display panel, a voltage generator for providing the initialization voltage in the driving chip is reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, the structure of the display panel is simplified, the wiring of the display panel is facilitated, and the pixel density is improved.
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Fig. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the invention, and referring to fig. 2, the initialization block 150 includes a first transistor T1 and a second transistor T2, and the output terminal of the initialization block 150 includes a first output terminal N1 and a second output terminal N2; a gate electrode of the first transistor T1 is electrically connected to the first scan signal input terminal Sn-1, a first electrode of the first transistor T1 is electrically connected to a cathode electrode of the organic light emitting device 140, and a second electrode of the first transistor T1 is electrically connected to an anode electrode of the organic light emitting device 140 as a first output terminal N1 of the initialization module 150; the gate of the second transistor T2 is electrically connected to the first scan signal input terminal Sn-1, the first electrode of the second transistor T2 is electrically connected to the second electrode of the first transistor T1, and the second electrode of the second transistor T2 is electrically connected to the control terminal of the driving module 130 as the second output terminal N2 of the initialization module 150.
Referring to fig. 2, the first transistor T1 and the second transistor T2 of the initialization module 150 are both P-type transistors for example. In the initialization stage, a low level signal is input from the first scan signal input terminal Sn-1, the first transistor T1 and the second transistor T2 are turned on, the cathode voltage of the organic light emitting device 140 is input to the anode of the organic light emitting device 140 through the turned-on first transistor T1, the cathode voltage of the organic light emitting device 140 is input to the control terminal of the driving module 130 and one terminal of the storage module 120 through the turned-on first transistor T1 and the turned-on second transistor T2 and the turned-on first transistor T1 and the turned-on second transistor T2, and the light emitting state of the organic light emitting device 140 in the previous frame is ended, so that the inconsistency of the light emitting brightness caused by the gate voltage jump of the driving transistor can be improved, the uniformity of the display is improved, the malfunction of the pixel circuit is avoided, and the power consumption is reduced; in addition, the initialization voltage is the voltage of the cathode of the organic light emitting device 140, and the driving chip of the display panel is not required to provide the initialization voltage, so that voltage generators for providing the initialization voltage in the driving chip are reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, and the structure of the display panel is simplified.
In the data writing phase, the data voltage writing module 110 is turned on, and the data voltage is written into the control terminal of the driving module 130; the memory module 120 may store the written data voltage; the driving module 130 may drive the organic light emitting device 140 to emit light according to the data voltage during the light emitting period.
Fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the invention, and referring to fig. 3, the data writing module includes a third transistor T3, the memory module 120 includes a capacitor C1, and the driving module 130 includes a fourth transistor T4;
a gate electrode of the third transistor T3 is electrically connected to the second scan signal input terminal Sn of the pixel circuit, a first electrode of the third transistor T3 is electrically connected to the data voltage input terminal Vdata of the pixel circuit, a second electrode of the third transistor T3 is electrically connected to a gate electrode of the fourth transistor T4, a first electrode of the fourth transistor T4 is electrically connected to the second voltage signal input terminal Vdd of the pixel circuit, and a second electrode of the fourth transistor T4 is electrically connected to the anode electrode of the organic light emitting device 140;
a first terminal of the capacitor C1 is electrically connected to the second voltage signal input terminal Vdd, and a second terminal of the capacitor C1 is electrically connected to the gate of the fourth transistor T4.
Fig. 4 is an operation timing diagram of a pixel circuit according to an embodiment of the invention, wherein the operation timing diagram can correspond to the pixel circuit shown in fig. 3. Referring to fig. 3 and 4, the operation timing of the pixel circuit shown in fig. 3 includes an initialization phase t11, a data writing phase t12, and a light emitting phase t 13. The first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 in the pixel circuit are schematically illustrated as P-type transistors.
With continued reference to fig. 3 and 4, in the initialization phase T11, a low level signal is input to the first scan signal input terminal Sn-1, a high level signal is input to the second scan signal input terminal Sn, the first transistor T1 and the second transistor T2 are turned on, the third transistor T3 is turned off, the cathode voltage of the organic light emitting device 140 is input to the anode of the organic light emitting device 140 through the turned-on first transistor T1, the cathode voltage of the organic light emitting device 140 is input to the control terminal of the driving module 130 and one end of the capacitor C1 through the turned-on first transistor T1 and the turned-on second transistor T2, and the light emitting state of the organic light emitting device 140 in the previous frame is ended, so that the inconsistency of the light emitting brightness caused by the gate voltage jump of the driving transistors can be improved, the uniformity of the display can be improved, the malfunction of the pixel circuit can be avoided, and the power consumption can be reduced; in addition, the initialization voltage is the voltage of the cathode of the organic light emitting device 140, and the driving chip of the display panel is not required to provide the initialization voltage, so that voltage generators for providing the initialization voltage in the driving chip are reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, and the structure of the display panel is simplified.
In the data writing period T12, the second scan signal input terminal Sn inputs a low level signal, the first scan signal input terminal Sn-1 inputs a high level signal, the first transistor T1 and the second transistor T2 are turned off, the third transistor T3 is turned on, the data voltage input from the data voltage input terminal Vdata is written to the gate of the fourth transistor T4 through the turned-on third transistor T3, and one end of the capacitor C1 is written, and the capacitor C1 stores the data voltage.
In the light emitting period T13, the first scan signal input terminal Sn-1 and the second scan signal input terminal Sn input high level signals, the first transistor T1, the second transistor T2 and the third transistor T3 are turned off, the fourth transistor T4 is turned on, and the fourth transistor T4, i.e., the driving module 130, drives the organic device to emit light according to the data voltage written to the due gate.
Fig. 5 is a schematic structural diagram of another pixel circuit provided in an embodiment of the present invention, and referring to fig. 5, in addition to the above solution, optionally, the pixel circuit further includes a fifth transistor T5, a gate of the fifth transistor T5 is electrically connected to the light emission control signal input end EM of the pixel circuit, and a second pole of the fourth transistor T4 is electrically connected to the anode of the organic light emitting device 140 through the fifth transistor T5.
Fig. 6 is an operation timing diagram of another pixel circuit according to an embodiment of the invention, wherein the operation timing diagram can correspond to the pixel circuit shown in fig. 5. The operation timing of the pixel circuit shown in fig. 5 includes an initialization stage, a data writing stage, and a light emitting stage. Hereinafter, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 in the pixel circuit are schematically illustrated as P-type transistors.
Referring to fig. 3 to 6, the on or off states of the first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4 in the initialization phase T21, the data writing phase T22 and the light emitting phase T23 of the pixel circuit shown in fig. 5 are the same as the on or off states of the first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4 in the initialization phase T11, the data writing phase T12 and the light emitting phase T13 of the pixel circuit shown in fig. 2.
Referring to fig. 5 and 6, in the initialization period T21 and the data writing period T22, the light emission control signal input terminal inputs a high level signal, and the fifth transistor T5 is turned off; in the light emitting period, the light emitting control signal input terminal EM inputs a low level signal, the fifth transistor T5 is turned on, and the organic light emitting device 140 emits light. By providing the fifth transistor T5 in the pixel circuit, the light emitting state of the organic light emitting device 140 can be effectively controlled, and the display effect is prevented from being affected by the light emission error of the organic light emitting device 140.
Optionally, the first scan signal input terminal Sn-1 is electrically connected to the n-1 th row of scan lines, and the second scan signal input terminal Sn is electrically connected to the n-1 th row of scan lines, where n is greater than or equal to 1 and less than or equal to m, where m is the total row number of pixels, so that when the n-1 th row of pixels writes in the data voltage, the n-th row of pixels is initialized, so that the data voltage of each pixel in the whole display panel is written in order, and normal display of the display panel is ensured.
Fig. 7 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 7, the pixel circuit further includes a compensation module 160 and a light-emitting control module 170, wherein the compensation module 160 is used for compensating the data voltage written into the driving module 130; the light emission control module 170 is used for controlling a driving signal to be input to the organic light emitting device 140 to control the organic light emitting device 140 to emit light.
Referring to fig. 7, the compensation module 160 compensates the data voltage written into the driving module 130, so as to eliminate the problem of non-uniform display caused by the variation of the threshold voltage of the driving module 130, thereby improving the performance of the display panel including the pixel circuit.
The light emitting control module 170 may be disposed between the driving module 130 and the first voltage signal input terminal Vss, and between the driving module 130 and the second voltage signal input terminal Vdd, and by disposing the light emitting control module 170, the organic light emitting device 140 may be effectively controlled, so that the organic light emitting device 140 may be controlled not to emit light in a stage other than a light emitting stage, and the organic light emitting device 140 may be controlled to emit light in the light emitting stage.
Fig. 8 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 8, the initialization module 150 includes a sixth transistor T6, the data voltage writing module 110 includes a seventh transistor T7, the driving module 130 includes an eighth transistor T8, the compensation module 160 includes a ninth transistor T9, and the light emitting control module 170 includes a tenth transistor T10 and an eleventh transistor T11;
a gate electrode of the sixth transistor T6 is electrically connected to the first scan signal input terminal Sn-1, a first electrode of the sixth transistor T6 is electrically connected to the cathode of the organic light emitting device 140, and a second electrode of the sixth transistor T6 is electrically connected to the anode of the organic light emitting device 140;
a gate of the seventh transistor T7 is electrically connected to the second scan signal input terminal Sn of the pixel circuit, a first pole of the seventh transistor T7 is electrically connected to the data voltage input terminal, and a second pole of the seventh transistor T7 is electrically connected to the first pole of the eighth transistor T8;
a first pole of the eighth transistor T8 is electrically connected to a second pole of the tenth transistor T10, a first pole of the tenth transistor T10 is electrically connected to the second voltage signal input terminal Vdd of the pixel circuit, and a gate of the tenth transistor T10 is electrically connected to the first emission control signal input terminal EM1 of the pixel circuit; a second pole of the eighth transistor T8 is electrically connected to a first pole of an eleventh transistor T11, a second pole of the eleventh transistor T11 is electrically connected to the anode of the organic light emitting device 140, and a gate of the eleventh transistor T11 is electrically connected to the second light emission control signal input terminal EM2 of the pixel circuit;
a gate of the ninth transistor T9 is electrically connected to the first control signal input terminal G1 of the pixel circuit, a first pole of the ninth transistor T9 is electrically connected to a gate of the eighth transistor T8, and a second pole of the ninth transistor T9 is electrically connected to a second pole of the eighth transistor T8.
Fig. 9 is an operation timing diagram of another pixel circuit according to an embodiment of the invention, wherein the operation timing diagram can correspond to the pixel circuit shown in fig. 8. Referring to fig. 8 and 9, the operation timing of the pixel circuit shown in fig. 8 includes an initialization phase t31, a write compensation phase t32, and a light emission phase t 33. The sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9, the tenth transistor T10, and the eleventh transistor T11 in the pixel circuit are exemplified as P-type transistors in the following description.
In the initialization stage T31, the first scan signal input terminal Sn-1, the second emission control signal input terminal EM2 and the first control signal input terminal G1 input low level signals, the second scan signal input terminal Sn and the first emission control signal input terminal EM1 input high level signals, the sixth transistor T6, the ninth transistor T9 and the eleventh transistor T11 are turned on, the turned-on sixth transistor T6, the ninth transistor T9 and the eleventh transistor T11 form an initialization unit, the first voltage input from the first voltage signal input terminal Vss, i.e., the cathode voltage of the organic light emitting device 140, is written to the gate of the eighth transistor T8 and one end of the capacitor C1 through the turned-on sixth transistor T6, the turned-on eleventh transistor T11 and the ninth transistor T9, the organic light emitting device 140 is terminated in the emission state of the previous frame, so that the emission brightness inconsistency caused by the gate voltage jump of the driving transistors can be improved, the uniformity of display is improved, the misoperation of a pixel circuit is avoided, and the power consumption is reduced; in addition, the initialization voltage is the voltage of the cathode of the organic light emitting device 140, and the driving chip of the display panel is not required to provide the initialization voltage, so that voltage generators for providing the initialization voltage in the driving chip are reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, and the structure of the display panel is simplified.
In the write compensation phase T32, the second scan signal input terminal Sn and the first control signal input terminal G1 input a low level signal, the first scan signal input terminal Sn-1, the first emission control signal input terminal EM1, and the second emission control signal input terminal EM2 input a high level signal, the seventh transistor T7, the eighth transistor T8, and the ninth transistor T9 are turned on, the other transistors are turned off, the data voltage input by the data voltage input terminal Vdata is written to the gate of the eighth transistor T8 and one end of the capacitor C1 through the turned-on seventh transistor T7, the eighth transistor T8, and the ninth transistor T9 until the gate potential of the eighth transistor T8 is Vdata-Vth (Vth is the threshold voltage of the eighth transistor T5), and the eighth transistor T8 completes the writing of the data voltage and the threshold compensation.
In the light emitting period T33, the first and second light emitting control signal input terminals EM1 and EM2 input low level signals, the first scan signal input terminal Sn-1, the second scan signal input terminal Sn, and the first control signal input terminal G1 input high level signals, the eleventh transistor T11 and the twelfth transistor T12 are turned on, and the organic light emitting device 140 emits light.
Fig. 10 is a schematic structural diagram of another pixel circuit provided in the embodiment of the invention, and referring to fig. 10, optionally, the initialization module 150 further includes a twelfth transistor T12, a gate of the twelfth transistor T12 is electrically connected to the first scan signal input terminal Sn-1, a first pole of the twelfth transistor T12 is electrically connected to the second pole of the sixth transistor T6, and a second pole of the twelfth transistor T12 is electrically connected to the gate of the eighth transistor T8.
Fig. 11 is an operation timing diagram of another pixel circuit according to an embodiment of the invention, wherein the operation timing diagram can correspond to the pixel circuit shown in fig. 10. Referring to fig. 10 and 11, the operation timing of the pixel circuit shown in fig. 10 includes an initialization phase t41, a write compensation phase t42, and a light emission phase t 43. The sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9, the tenth transistor T10, the eleventh transistor T11, and the twelfth transistor T12 in the pixel circuit are exemplified by P-type transistors.
In the initialization stage T41, the first scan signal input terminal Sn-1 inputs a low level signal, the second scan signal input terminal Sn, the first light emitting control signal input terminal EM1, the second light emitting control signal input terminal EM2 and the first control signal input terminal G1 input a high level signal, the eleventh transistor T11 and the twelfth transistor T12 are turned on, the first voltage input from the first voltage signal input terminal Vss, i.e., the cathode voltage of the organic light emitting device 140, is written to the anode of the organic light emitting device 140 through the turned-on eleventh transistor T11, and is written to the gate of the eighth transistor T8 and one end of the capacitor C1 through the turned-on eleventh transistor T11 and the turned-on twelfth transistor T12, so as to terminate the light emitting state of the organic light emitting device 140 in the previous frame, so that the inconsistency of the light emitting brightness caused by the gate voltage jump of the driving transistor can be improved, and the uniformity of the display can be improved, the misoperation of the pixel circuit is avoided and the power consumption is reduced; in addition, the initialization voltage is the voltage of the cathode of the organic light emitting device 140, and the driving chip of the display panel is not required to provide the initialization voltage, so that voltage generators for providing the initialization voltage in the driving chip are reduced, signal lines between the driving chip and the pixel circuit of the display panel are reduced, and the structure of the display panel is simplified.
In the write compensation phase T42, the second scan signal input terminal Sn and the first control signal input terminal input a low level signal, the first scan signal input terminal Sn-1, the first emission control signal input terminal, and the second emission control signal input terminal input a high level signal, the seventh transistor T7, the eighth transistor T8, and the ninth transistor T9 are turned on, the other transistors are turned off, the data voltage input at the data voltage input terminal is written to the gate of the eighth transistor T8 and one end of the capacitor C1 through the turned-on seventh transistor T7, the eighth transistor T8, and the ninth transistor T9 until the gate potential of the eighth transistor T8 is ata- | Vth | (Vth is the threshold voltage of the eighth transistor T5), and the eighth transistor T8 is turned off, thereby completing the writing of the data voltage and the threshold compensation.
In the light emitting period T43, the first and second light emitting control signal input terminals EM1 and EM2 input low level signals, the first scan signal input terminal Sn-1, the second scan signal input terminal Sn, and the first control signal input terminal G1 input high level signals, the eleventh transistor T11 and the twelfth transistor T12 are turned on, and the organic light emitting device 140 emits light.
On the basis of the above scheme, optionally, the first emission control signal input terminal EM1 and the second emission control signal input terminal EM2 are electrically connected to the same emission control line, and the second scan signal input terminal Sn and the first control signal input terminal G1 are electrically connected to the same scan line. Through the connection mode, the wiring mode of the pixel circuit can be simplified, the pixel density can be improved, and the wiring of the display panel can be simplified.
An embodiment of the present invention further provides a driving method for a pixel circuit, where the driving method is used to drive a driving circuit provided in any embodiment of the present invention, fig. 12 is a flowchart of the driving method for a pixel circuit provided in the embodiment of the present invention, and referring to fig. 12, the driving method includes:
and step 230, in the light emitting stage, the driving module is turned on and drives the organic light emitting device to emit light according to the data voltage.
The driving method of the pixel circuit provided by the embodiment of the invention, wherein the input end of the initialization module of the pixel circuit is electrically connected with the cathode of the organic light emitting device, the output end of the initialization module is electrically connected with the anode of the organic light emitting device, the control end of the driving module is electrically connected with the storage capacitor module, the initialization module is turned on in the initialization stage, the data voltage writing module is turned off, the first voltage input by the first voltage input signal input end is written into the anode of the organic light emitting device, the control end of the driving module and the storage module through the turned-on initialization module, so that the initialization voltage of the pixel circuit is not required to be provided by the driving chip of the display panel, the voltage generator for providing the initialization voltage in the driving chip is reduced, the signal lines between the driving chip and the pixel circuit of the display panel are reduced, and the structure of the display panel is simplified, the wiring of the display panel is facilitated, and the pixel density is improved.
The embodiment of the invention also provides a display panel which comprises the pixel circuit provided by any embodiment of the invention. Fig. 13 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 13, the display panel 30 includes a data signal driving unit 310 electrically connected to data voltage input terminals of the pixel circuits through a plurality of data lines (D1, D2, D3 … …) for providing data signals; a scan driving unit 320 electrically connected to the scan signal input terminals of the pixel circuits of the respective pixels through a plurality of scan lines (G1, G2, G3 … …) for supplying scan signals, specifically, for the pixel circuits of the first row of pixels, electrically connected to the scan line G1 and the scan line G2, respectively, for the pixel circuits of the second row of pixels, electrically connected to the scan line G2 and the scan line G3, respectively, and so on … …; and a light emission control driving unit 330 electrically connected to the light emission control signal input terminals of the pixel circuits of the respective pixels through a plurality of light emission control signal lines (E1, E2, E3 … …) for supplying light emission control signals.
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 greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. A pixel circuit is characterized by comprising a data voltage writing module, a storage module, a driving module, an organic light-emitting device and an initialization module;
the data voltage writing module is used for writing data voltage into the driving module;
the storage module is used for storing the data voltage;
the driving module is used for driving the organic light-emitting device to emit light according to the data voltage;
the anode of the organic light-emitting device is electrically connected with the driving module, and the cathode of the organic light-emitting device is electrically connected with the first voltage signal input end of the pixel circuit;
the initialization module comprises a control end, an input end and an output end, wherein the control end of the initialization module is electrically connected with the first scanning signal input end of the pixel circuit, the input end of the initialization module is electrically connected with the cathode of the organic light-emitting device, the output end of the initialization module is electrically connected with the anode of the organic light-emitting device, and is also electrically connected with the control end of the driving module and the storage module.
2. The pixel circuit according to claim 1, wherein the initialization module comprises a first transistor and a second transistor, and the output terminal of the initialization module comprises a first output terminal and a second output terminal; a gate of the first transistor is electrically connected to the first scan signal input terminal, a first electrode of the first transistor is electrically connected to a cathode of the organic light emitting device, and a second electrode of the first transistor is electrically connected to an anode of the organic light emitting device as a first output terminal of the initialization module; the gate of the second transistor is electrically connected to the first scan signal input terminal, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the control terminal of the driving module as the second output terminal of the initialization module.
3. The pixel circuit according to claim 2, wherein the data writing module comprises a third transistor, the storage module comprises a capacitor, and the driving module comprises a fourth transistor;
a gate electrode of the third transistor is electrically connected to the second scan signal input terminal of the pixel circuit, a first electrode of the third transistor is electrically connected to the data voltage input terminal of the pixel circuit, a second electrode of the third transistor is electrically connected to a gate electrode of the fourth transistor, a first electrode of the fourth transistor is electrically connected to the second voltage signal input terminal of the pixel circuit, and a second electrode of the fourth transistor is electrically connected to the anode electrode of the organic light emitting device;
the first end of the capacitor is electrically connected with the second voltage signal input end, and the second end of the capacitor is electrically connected with the grid electrode of the fourth transistor.
4. The pixel circuit according to claim 3, further comprising a fifth transistor, wherein a gate of the fifth transistor is electrically connected to a light emission control signal input terminal of the pixel circuit, and a second pole of the fourth transistor is electrically connected to an anode of the organic light emitting device through the fifth transistor.
5. The pixel circuit according to claim 3, wherein the first scan signal input terminal is electrically connected to a scan line of an n-1 th row, and the second scan signal input terminal is electrically connected to a scan line of an n-th row, wherein n is greater than or equal to 1 and less than or equal to m, and wherein m is a total number of rows of pixels.
6. The pixel circuit according to claim 1, further comprising a compensation module and a light emission control module, wherein the compensation module is configured to compensate for a data voltage written to the driving module; the light emitting control module is used for controlling a driving signal to be input into the organic light emitting device so as to control the organic light emitting device to emit light.
7. The pixel circuit according to claim 6, wherein the initialization module comprises a sixth transistor, the data voltage writing module comprises a seventh transistor, the driving module comprises an eighth transistor, the compensation module comprises a ninth transistor, and the light emission control module comprises a tenth transistor and an eleventh transistor;
a gate of the sixth transistor is electrically connected to a first scan signal input terminal, a first pole of the sixth transistor is electrically connected to a cathode of the organic light emitting device, and a second pole of the sixth transistor is electrically connected to an anode of the organic light emitting device;
a gate of the seventh transistor is electrically connected to the second scan signal input terminal of the pixel circuit, a first pole of the seventh transistor is electrically connected to the data voltage input terminal, and a second pole of the seventh transistor is electrically connected to the first pole of the eighth transistor;
a first pole of the eighth transistor is electrically connected to the second pole of the tenth transistor, a first pole of the tenth transistor is electrically connected to the second voltage signal input terminal of the pixel circuit, and a gate of the tenth transistor is electrically connected to the first light emission control signal input terminal of the pixel circuit; a second pole of the eighth transistor is electrically connected to the first pole of the eleventh transistor, a second pole of the eleventh transistor is electrically connected to the anode of the organic light emitting device, and a gate of the eleventh transistor is electrically connected to the second light emission control signal input terminal of the pixel circuit;
a gate of the ninth transistor is electrically connected to the first control signal input terminal of the pixel circuit, a first pole of the ninth transistor is electrically connected to the gate of the eighth transistor, and a second pole of the ninth transistor is electrically connected to the second pole of the eighth transistor.
8. The pixel circuit according to claim 7, wherein the initialization module further comprises a twelfth transistor, a gate of the twelfth transistor is electrically connected to the first scan signal input terminal, a first pole of the twelfth transistor is electrically connected to a second pole of the sixth transistor, and a second pole of the twelfth transistor is electrically connected to a gate of the eighth transistor.
9. The pixel circuit according to claim 8, wherein the first light emission control signal input terminal and the second light emission control signal input terminal are electrically connected to a same light emission control line, and wherein the second scan signal input terminal and the first control signal input terminal are electrically connected to a same scan line.
10. A driving method of a pixel circuit for driving the pixel circuit according to any one of claims 1 to 9, comprising:
in the initialization stage, the initialization module is turned on, the data voltage writing module is turned off, and a first voltage input by the first voltage signal input end is written into the anode of the organic light emitting device, the control end of the driving module and the storage module through the turned-on initialization module;
in the data writing stage, the data voltage writing module is switched on, the initialization module is switched off, and the data voltage is written into the driving module;
and in the light emitting stage, the driving module is conducted and drives the organic light emitting device to emit light according to the data voltage.
11. A display panel comprising the pixel circuit according to any one of claims 1 to 9.
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| CN112116896B (en) * | 2020-10-20 | 2021-12-03 | 武汉华星光电半导体显示技术有限公司 | Pixel driving circuit |
| CN115803884A (en) * | 2021-06-29 | 2023-03-14 | 京东方科技集团股份有限公司 | Array substrate and display device |
| CN114241978A (en) * | 2021-12-21 | 2022-03-25 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN114495799A (en) * | 2022-03-04 | 2022-05-13 | 昆山国显光电有限公司 | Pixel circuit and display panel |
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