CN108847186B - Pixel circuit, driving method thereof, display panel and display device - Google Patents
Pixel circuit, driving method thereof, display panel and display device Download PDFInfo
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- CN108847186B CN108847186B CN201810714758.XA CN201810714758A CN108847186B CN 108847186 B CN108847186 B CN 108847186B CN 201810714758 A CN201810714758 A CN 201810714758A CN 108847186 B CN108847186 B CN 108847186B
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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]
- G09G3/3266—Details of drivers for scan electrodes
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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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Abstract
The invention provides a pixel circuit and a driving method thereof, a display panel and a display device, wherein the pixel circuit comprises eight transistors, two storage capacitors and an organic light-emitting element, and the threshold voltage of a first transistor is compensated through the mutual matching of the transistors and the capacitors, so that the driving current for driving the organic light-emitting element to emit light is irrelevant to the threshold voltage of the first transistor, the influence of the fluctuation of the threshold voltage of the first transistor on the organic light-emitting element is avoided, the problem of uneven display brightness caused by the fluctuation is solved, and the display effect of the whole picture is improved; in addition, the eighth transistor can reduce leakage current between the first storage capacitor and the second storage capacitor, and the reduction of the grid voltage of the first transistor is avoided, so that the problem of flicker caused by the leakage current is solved, and the display effect of the whole display picture is further improved.
Description
Technical Field
The invention relates to the technical field of flat panel display, in particular to a pixel circuit, a driving method thereof, a display panel and a display device.
Background
Organic Light Emitting Diodes (OLEDs) are one of the hot spots in the research field of displays, and compared with Liquid Crystal Displays (LCDs), OLEDs have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like. Currently, in the display fields of mobile phones, PDAs, digital cameras, etc., OLED displays have begun to replace the conventional LCD displays. The pixel circuit design is the core technical content of the OLED display, and has important research significance.
Unlike the method of controlling brightness using a stable voltage of an LCD, an OLED is current-driven and requires a stable current to control light emission. Due to the reasons of process, device aging and the like, the threshold voltage of the driving transistor of the pixel circuit has non-uniformity, so that the current flowing through different OLED pixels changes to cause non-uniform display brightness, thereby affecting the display effect of the whole image.
At present, the problem is mainly solved by an internal compensation function of a pixel circuit, the internal compensation of the pixel circuit can be realized only by the pixel circuit with the compensation function, the pixel circuit is generally a 7T1C (7 transistors and 1 capacitor) circuit, but in a data writing stage of the 7T1C circuit, due to the characteristics of the transistors, a small current still passes through the transistors when the transistors are turned off, the gate voltage of the driving transistors is reduced, the luminance of the organic light-emitting element changes along with time, and the problem of flicker is formed.
Disclosure of Invention
The invention aims to provide a pixel circuit, a driving method thereof, a display panel and a display device, which can reduce the grid leakage current of a driving transistor and improve the display effect while compensating the threshold voltage of the driving transistor.
To achieve the above object, the present invention provides a pixel circuit comprising:
first to eighth transistors, a first storage capacitor, a second storage capacitor, and an organic light emitting element; wherein,
the fourth transistor is used for initializing the first storage capacitor by adopting a signal of an initialization signal end under the control of the first scanning signal end;
the second transistor and the third transistor are used for storing a signal of a data signal end and the threshold voltage of the first transistor into the first storage capacitor under the control of a second scanning signal end so as to compensate the threshold voltage of the first transistor;
the eighth transistor is used for storing a signal of a data signal terminal to the second storage capacitor under the control of the second scanning signal terminal so as to reduce a leakage current between the first storage capacitor and the second storage capacitor;
the seventh transistor is used for initializing the organic light-emitting element by using a signal of the initialization signal terminal under the control of the third scanning signal terminal;
the fifth transistor is used for providing a signal of a first voltage signal end to the first transistor under the control of the control signal end;
the sixth transistor is used for enabling the first transistor and the organic light-emitting element to be conducted under the control of the control signal end;
the first storage capacitor is used for holding the grid voltage of the first transistor;
the first transistor is used for generating a driving current according to a signal of the data signal end so as to drive the organic light-emitting element to emit light.
Optionally, a gate of the fourth transistor is connected to the first scan signal terminal, a first electrode of the fourth transistor is connected to the first terminal of the first storage capacitor, a second electrode of the fourth transistor is connected to the initialization signal terminal, and a second terminal of the first storage capacitor is connected to the first voltage signal terminal; a gate of the seventh transistor is connected to the third scan signal terminal, a first electrode of the seventh transistor is connected to the initialization signal terminal, a second electrode of the seventh transistor is connected to an anode of the organic light emitting device, and a cathode of the organic light emitting device is connected to the second voltage signal terminal.
Optionally, a gate of the first transistor is connected to the first end of the first storage capacitor, a first electrode of the first transistor is connected to the first electrode of the second transistor, and a second electrode of the first transistor is connected to the first electrode of the third transistor; a gate of the second transistor is connected to the second scan signal terminal, and a second electrode of the second transistor is connected to the data signal terminal; the gate of the third transistor is connected to the second scan signal terminal, and the second electrode of the third transistor is connected to the first terminal of the storage capacitor.
Optionally, a gate of the fifth transistor is connected to the control signal terminal, a first electrode of the fifth transistor is connected to the first voltage signal terminal, and a second electrode of the fifth transistor is connected to the first electrode of the first transistor; a gate of the sixth transistor is connected to the control signal terminal, a first electrode of the sixth transistor is connected to the second electrode of the first transistor, and a second electrode of the sixth transistor is connected to an anode of the organic light emitting element.
Optionally, a gate of the eighth transistor is connected to the second scan signal terminal, a first electrode of the eighth transistor is connected to the data signal terminal, a second electrode of the eighth transistor is connected to the first terminal of the second storage capacitor, and a second terminal of the second storage capacitor is connected to the first voltage signal terminal.
Optionally, the third transistor includes two sub-transistors connected in series, a gate of the first sub-transistor is connected to the second scan signal terminal, a first electrode of the first sub-transistor is connected to a second electrode of the second sub-transistor, and a second electrode of the first sub-transistor is connected to the first terminal of the first storage capacitor; the grid electrode of the second sub transistor is connected with the second scanning signal end, and the first electrode of the second sub transistor is connected with the second electrode of the first transistor.
Optionally, the fourth transistor includes two sub-transistors connected in series, a gate of the third sub-transistor is connected to the first scan signal terminal, a first electrode of the third sub-transistor is connected to the first terminal of the first storage capacitor, and a second electrode of the third sub-transistor is connected to the first electrode of the fourth sub-transistor and the first terminal of the second storage capacitor; and the grid electrode of the fourth sub-transistor is connected with a first scanning signal end, and the second electrode of the fourth sub-transistor is connected with the initialization signal end.
Correspondingly, the invention also provides a driving method of the pixel circuit, which is applied to the pixel circuit, and the driving method of the pixel circuit comprises the following steps:
the first stage is as follows: a first scanning signal end provides a low level signal, and a fourth transistor initializes the first storage capacitor by adopting a signal of an initialization signal end under the control of the first scanning signal end;
and a second stage: a second scanning signal end provides a low-level signal, and a second transistor and a third transistor store a signal of a data signal end and the threshold voltage of the first transistor to the first storage capacitor under the control of the second scanning signal end so as to compensate the threshold voltage of the first transistor; the eighth transistor stores a signal of a data signal terminal to the second storage capacitor under the control of the second scan signal terminal to reduce a leakage current between the first storage capacitor and the second storage capacitor;
and a third stage: the third scanning signal end provides a low-level signal, and the seventh transistor is used for initializing the organic light-emitting element by adopting a signal of the initialization signal end under the control of the third scanning signal end;
a fourth stage: the control signal end provides a low-level signal, the fifth transistor provides a signal of a first voltage signal end to the first transistor under the control of the control signal end, the sixth transistor enables the first transistor and the organic light-emitting element to be conducted under the control of the control signal end, the first storage capacitor keeps the grid voltage of the first transistor, and the first transistor generates a driving current according to a signal of the data signal end so as to drive the organic light-emitting element to emit light.
Correspondingly, the invention also provides a display panel comprising the pixel circuit.
Correspondingly, the invention also provides a display device which comprises the display panel.
Compared with the prior art, the pixel circuit, the driving method thereof, the display panel and the display device provided by the invention have the following beneficial effects:
the pixel circuit provided by the invention comprises eight transistors, two storage capacitors and an organic light-emitting element, wherein the threshold voltage of the first transistor is compensated through the mutual matching of the transistors and the capacitors, so that the driving current for driving the organic light-emitting element to emit light is unrelated to the threshold voltage of the first transistor, the influence of the fluctuation of the threshold voltage of the first transistor on the organic light-emitting element is avoided, the problem of uneven display brightness caused by the fluctuation is solved, and the display effect of the whole picture is improved; in addition, the eighth transistor can reduce leakage current between the first storage capacitor and the second storage capacitor, and the reduction of the grid voltage of the first transistor is avoided, so that the problem of flicker caused by the leakage current is solved, and the display effect of the whole display picture is further improved.
Drawings
FIG. 1 is a schematic diagram of a pixel circuit;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 3 is a schematic diagram of a circuit operation timing sequence in a pixel circuit driving method according to an embodiment of the invention.
Detailed Description
Fig. 1 is a schematic structural diagram of a pixel circuit, as shown in fig. 1, the pixel circuit includes: a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, a storage capacitor Cst, and an organic light emitting element OLED.
The gate of the first transistor M1 is connected to the first end of the storage capacitor Cst, the first electrode of the first transistor M1 is connected to the first electrode of the second transistor M2, and the second electrode of the first transistor M1 is connected to the first electrode of the third transistor M3. The gate of the second transistor M2 is connected to the second scan signal terminal S2, and the second electrode of the second transistor M2 is connected to the data signal terminal Vdata. A gate of the third transistor M3 is coupled to the second scan signal terminal S2, and a second electrode of the third transistor M3 is coupled to the first terminal of the storage capacitor Cst. The second terminal of the storage capacitor Cst is connected to the first voltage signal terminal VDD.
The gate of the fourth transistor M4 is connected to the first scan signal terminal S1, the first electrode of the fourth transistor M4 is connected to the first terminal of the storage capacitor Cst, and the second electrode of the fourth transistor M4 is connected to the initialization signal terminal Vref. A gate of the fifth transistor M5 is connected to the control signal terminal EM, a first electrode of the fifth transistor M5 is connected to the first voltage signal terminal VDD, and a second electrode of the fifth transistor M5 is connected to the first electrode of the first transistor M1. A gate of the sixth transistor M6 is connected to the control signal terminal EM, a first electrode of the sixth transistor M6 is connected to the second electrode of the first transistor M1, and a second electrode of the sixth transistor M6 is connected to the anode of the organic light emitting element OLED. The cathode of the organic light emitting element OLED is connected to a second voltage signal terminal VSS.
A gate of the seventh transistor M7 is connected to the third scan signal terminal S3, a first electrode of the seventh transistor M7 is connected to the initialization signal terminal Vref, and a second electrode of the seventh transistor M7 is connected to an anode of the organic light emitting element OLED.
Preferably, the third transistor M3 includes two sub-transistors connected in series, the gate of the first sub-transistor M31 is connected to the second scan signal terminal S2, the first electrode of the first sub-transistor M31 is connected to the second electrode of the second sub-transistor M32, and the second electrode of the first sub-transistor M31 is connected to the first terminal of the storage capacitor Cst; the gate of the second sub-transistor M32 is connected to the second scan signal terminal S2, and the first electrode of the second sub-transistor M32 is connected to the second electrode of the first transistor M1.
Preferably, the fourth transistor M4 includes two sub-transistors connected in series, the gate of the third sub-transistor M41 is connected to the first scan signal terminal S1, the first duna of the third sub-transistor M41 is connected to the first terminal of the storage capacitor Cst, and the second electrode of the third sub-transistor M41 is connected to the first electrode of the fourth sub-transistor M42; the gate of the fourth sub-transistor M42 is connected to the first scan signal terminal S1, and the second electrode of the fourth sub-transistor M42 is connected to the initialization signal terminal Vref.
The first terminal of the storage capacitor Cst, the gate of the first transistor M1, the second electrode of the third transistor M3, and the first electrode of the fourth transistor M4 intersect at a node a. The second electrode of the third sub-transistor M41 and the first electrode of the fourth sub-transistor M42 intersect at a node B.
In an initialization stage, the first scan signal terminal S1 provides a low level signal, the fourth transistor M4 is turned on, and the initialization signal Vref initializes the storage capacitor Cst via the fourth transistor M4. In the data writing stage, the second scan signal terminal S2 provides a low level signal, the second transistor M2 and the third transistor M3 are turned on, the first terminal of the storage capacitor Cst is charged by the signal provided by the data signal terminal Vdata until the first transistor M1 is turned off, the voltage at the node a is the sum of the signal provided by the data signal terminal Vdata and the threshold voltage of the first transistor M1, and the voltage at the node B is only the signal provided by the initialization signal terminal Vref and is at a low level, so that a leakage current is generated between the node a and the node B, that is, the node a generates a leakage current along the arrow direction shown in fig. 1, and the gate voltage of the first transistor M1 is pulled down, so that the luminance of the organic light emitting device OLED changes with time, thereby causing a flicker problem.
In view of the above technical problems, the applicant has studied and provided a pixel circuit, a driving method thereof, a display panel and a display device, which can compensate for the threshold voltage of the first transistor, and reduce the gate leakage current of the first transistor, thereby improving the display effect.
In order to make the contents of the present invention more clearly understood, the contents of the present invention will be further described with reference to the accompanying drawings. The invention is of course not limited to this particular embodiment, and general alternatives known to those skilled in the art are also covered by the scope of the invention.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The present invention is described in detail with reference to the drawings, and for convenience of explanation, the drawings are not enlarged partially according to the general scale, and should not be construed as limiting the present invention.
The core idea of the invention is that the threshold voltage of the first transistor is compensated through the mutual matching of each transistor and the capacitor, so that the driving current for driving the organic light-emitting element to emit light is unrelated to the threshold voltage of the first transistor, the influence of the fluctuation of the threshold voltage of the first transistor on the organic light-emitting element is avoided, the problem of uneven display brightness caused by the influence is solved, and the display effect of the whole picture is improved; in addition, the eighth transistor can reduce leakage current between the first storage capacitor and the second storage capacitor, and the reduction of the grid voltage of the first transistor is avoided, so that the problem of flicker caused by the leakage current is solved, and the display effect of the whole display picture is further improved.
Fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention, and as shown in fig. 2, the invention provides a pixel circuit including; the organic light emitting diode includes a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a first storage capacitor C1, a second storage capacitor C2, and an organic light emitting element OLED, wherein the fourth transistor M4 is configured to initialize the first storage capacitor C1 with a signal of an initialization signal terminal Vref under the control of a first scan signal terminal S1. The second transistor M2 and the third transistor M3 are used for storing a signal of a data signal terminal Vdata and a threshold voltage of the first transistor M1 to the first storage capacitor C1 under the control of the second scan signal terminal S2 to compensate for the threshold voltage of the first transistor M1; the eighth transistor M8 is used to store a signal of a data signal terminal Vdata to the second storage capacitor C2 under the control of the second scan signal terminal S2 to reduce a leakage current between the first storage capacitor C1 and the second storage capacitor C2. The seventh transistor M7 is used for initializing the organic light emitting element OLED with a signal of the initialization signal terminal Vref under the control of the third scan signal terminal S3. The fifth transistor M5 is for providing a signal of a first voltage signal terminal VDD to the first transistor M1 under the control of the control signal terminal EM; the sixth transistor M6 is used for making the first transistor M1 and the organic light emitting element OLED conductive under the control of the control signal terminal EM; the first storage capacitor C1 is used for holding the gate voltage of the first transistor M1; the first transistor M1 is used for generating a driving current according to the signal of the data signal terminal Vdata to drive the organic light emitting element OLED to emit light.
Specifically, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2, the gate of the fourth transistor M4 is connected to the first scan signal terminal S1, the first electrode of the fourth transistor M4 is connected to the first terminal of the first storage capacitor C1, the second electrode of the fourth transistor M4 is connected to the initialization signal terminal Vref, and the second terminal of the first storage capacitor C1 is connected to the first voltage signal terminal VDD; a gate of the seventh transistor M7 is connected to the third scan signal terminal S3, a first electrode of the seventh transistor M7 is connected to the initialization signal terminal Vref, a second electrode of the seventh transistor M7 is connected to an anode of the organic light emitting element OLED, and a cathode of the organic light emitting element OLED is connected to a second voltage signal terminal VSS.
A gate of the first transistor M1 is connected to a first end of the first storage capacitor C1, a first electrode of the first transistor M1 is connected to a first electrode of the second transistor M2, and a second electrode of the first transistor M1 is connected to a first electrode of the third transistor M3; a gate of the second transistor M2 is connected to the second scan signal terminal S2, and a second electrode of the second transistor M2 is connected to the data signal terminal Vdata; a gate of the third transistor M3 is connected to the second scan signal terminal S2, and a second electrode of the third transistor M3 is connected to the first terminal of the storage capacitor C1.
A gate of the fifth transistor M5 is connected to the control signal terminal EM, a first electrode of the fifth transistor M5 is connected to the first voltage signal terminal VDD, and a second electrode of the fifth transistor M5 is connected to the first electrode of the first transistor M1; a gate of the sixth transistor M6 is connected to the control signal terminal EM, a first electrode of the sixth transistor M6 is connected to the second electrode of the first transistor M1, and a second electrode of the sixth transistor M6 is connected to the anode of the organic light emitting element OLED.
A gate of the eighth transistor M8 is connected to the second scan signal terminal S2, a first electrode of the eighth transistor M8 is connected to the data signal terminal Vdata, a second electrode of the eighth transistor M8 is connected to a first terminal of the second storage capacitor C2, and a second terminal of the second storage capacitor C2 is connected to the first voltage signal terminal VDD.
In this embodiment, it is preferable that the third transistor M3 includes two sub-transistors connected in series, a gate of the first sub-transistor M31 is connected to the second scan signal terminal S2, a first electrode of the first sub-transistor M31 is connected to a second electrode of the second sub-transistor M32, and a second electrode of the first sub-transistor M31 is connected to the first end of the first storage capacitor C1; the gate of the second sub-transistor M32 is connected to the second scan signal terminal S2, and the first electrode of the second sub-transistor M32 is connected to the second electrode of the first transistor M1.
Preferably, the fourth transistor M4 includes two sub-transistors connected in series, the gate of the third sub-transistor M41 is connected to the first scan signal terminal S1, the first electrode of the third sub-transistor M41 is connected to the first terminal of the first storage capacitor C1, and the second electrode of the third sub-transistor M41 is connected to the first electrode of the fourth sub-transistor M42 and the first terminal of the second storage capacitor C2; the gate of the fourth sub-transistor M42 is connected to the first scan signal terminal S1, and the second electrode of the fourth sub-transistor M42 is connected to the initialization signal terminal Vref.
A first end of the first storage capacitor C1, the gate of the first transistor M1, the second electrode of the third transistor M3, and the first electrode of the fourth transistor M4 intersect at a node a. The first end of the second storage capacitor C2, the second electrode of the eighth transistor M8, the second electrode of the third sub-transistor M41 and the first electrode of the fourth sub-transistor M42 intersect at a point B.
All transistors used in the embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics. In this embodiment, the first electrode is a source electrode, and the second electrode is a drain electrode; or the first electrode is a drain electrode, and the second electrode is a source electrode.
In this embodiment, all the transistors are P-type transistors, and are turned on at a low level and turned off at a high level. For example, as shown in fig. 2, the second transistor M2 is a P-type transistor, the second transistor M2 is in a turned-on state when the signal provided by the second scan signal terminal S2 is at a low level, and the second transistor M2 is in a turned-off state when the signal provided by the second scan signal terminal S2 is at a high level.
The driving timing of the pixel circuit includes four stages, a first stage T1, a second stage T2, a third stage T3, and a fourth stage T4. The first scanning signal terminal S1 is a low level signal in the first stage T1, and a high level signal in the rest stages. The second scan signal segment S2 has a low level signal during the second stage T2 and a high level signal during the rest of the stages. The third scan signal terminal S3 has a low signal at the third stage T3 and a high signal at the rest stages. The signal of the control signal terminal EM in the fourth stage T4 is a low level signal, and the signal in the rest stages is a high level signal.
The first voltage signal terminal VDD outputs a signal having a relatively high level, and the second voltage signal terminal VSS outputs a signal having a relatively low level, the former being greater than the latter. The signal provided by the initialization signal terminal Vref is an initialization signal, and the signal provided by the Data signal terminal Data is a Data signal.
Fig. 3 is a schematic diagram of a circuit operation timing sequence in a pixel circuit driving method according to an embodiment of the present invention, as shown in fig. 3 and referring to fig. 2, the present invention provides a driving method of a pixel circuit, which is applied to the pixel circuit, and the driving method of the pixel circuit includes:
first stage T1: the first scan signal terminal S1 provides a low level signal, and the fourth transistor M4 initializes the first storage capacitor C1 with a signal of an initialization signal terminal Vref under the control of the first scan signal terminal S1;
second stage T2: the second scan signal terminal S2 provides a low level signal, and the second transistor M2 and the third transistor M3 store the signal of the data signal terminal Vdata and the threshold voltage of the first transistor M1 to the first storage capacitor C1 under the control of the second scan signal terminal S2 to compensate the threshold voltage of the first transistor M1; the eighth transistor M8 stores a signal of a data signal terminal Vdata to the second storage capacitor C2 under the control of the second scan signal terminal S2 to reduce a leakage current between the first storage capacitor C1 and the second storage capacitor C2;
third stage T3: the third scan signal terminal S3 provides a low level signal, and the seventh transistor M7 is used for initializing the organic light emitting element OLED with the signal of the initialization signal terminal Vref under the control of the third scan signal terminal S3;
fourth stage T4: the control signal terminal EM provides a low level signal, the fifth transistor M5 provides a signal of the first voltage signal terminal VDD to the first transistor M1 under the control of the control signal terminal EM, the sixth transistor M6 makes the first transistor M1 and the organic light emitting element OLED conductive under the control of the control signal terminal EM, the first storage capacitor C1 maintains the gate voltage of the first transistor M1, and the first transistor M1 generates a driving current according to the signal of the data signal terminal Vdata to drive the organic light emitting element OLED to emit light.
The four stages of the driving method of the pixel circuit provided by the invention can be discontinuous, for example, the four stages are spaced with the driving timing sequence of an external circuit. Of course, the four stages may be continuous, i.e., there is no interval between the four stages. In this embodiment, the four stages are described as an example.
Specifically, in the first phase T1, the signal provided by the first scan signal terminal S1 is a low level signal, the fourth transistor M4 is turned on, and the signal provided by the initialization signal terminal Vref initializes the first storage capacitor C1 through the fourth transistor M4.
In the second stage T2, the signal provided by the first scan signal terminal S1 is a high level signal, and the fourth transistor M4 is turned off. The signal provided by the second scan signal terminal S2 is a low level signal, the second transistor M2 and the third transistor M3 are turned on, and since the voltage at the node a is a low level (the signal provided by the initialization signal terminal Vref is a low level) after the initialization is performed in the first stage T1, the first transistor M1 is also turned on, so that the signal provided by the Data signal terminal Data charges the first storage capacitor C1 through the second transistor M2, the first transistor M1 and the third transistor M3, and when the first transistor M1 is turned off, the voltage at the node a is expressed by formula one:
[ formula one ]: VA-Vdate-IVthi
In formula one, Vdata represents a signal of the Data signal terminal Data, and Vth represents a threshold voltage of the first transistor M1.
The signal provided by the second scan signal terminal S2 is a low level signal, the eighth transistor M8 is turned on, the signal provided by the Data signal terminal Data charges the second storage capacitor C2 through the eighth transistor M8, and the voltage at the node B is represented by the formula two:
[ formula two ]: VB is Vdata
In formula two, Vdata represents a signal of the Data signal terminal Data.
Comparing the first formula with the second formula, it can be seen that the voltage difference between the node a and the node B is only Vth, and compared with the pixel circuit shown in fig. 1, the voltage difference is reduced, so that the leakage from the node a to the node B can be effectively reduced.
In the third stage T3, the signal provided by the second scan signal terminal S2 is a high level signal, and the second transistor M2 and the third transistor M3 are turned off. The signal provided by the third scan signal terminal S3 is a low level signal, the seventh transistor M7 is turned on, and the signal provided by the initialization signal terminal Vref initializes the organic light emitting element OLED through the seventh transistor M7.
In the fourth stage T4, the signal provided by the third scan signal terminal S3 is a high level signal, and the seventh transistor M7 is turned off. The signal provided by the control signal terminal EM is a low level signal, the fifth transistor M5 is turned on with the sixth transistor M6, the signal of the control signal terminal EM is provided to the first transistor M1 through the fifth transistor M5, the first transistor M1 is turned on with the organic light emitting diode OLED through the sixth transistor M6, the first storage capacitor C1 holds the gate voltage of the first transistor M1, and the first transistor M1 generates a driving current according to the signal of the data signal terminal Vdata to drive the organic light emitting element OLED to emit light.
At this time, the voltage difference between the gate and the source of the first transistor M1 is expressed by formula three:
[ formula three ]: Vsg-VDD-VA-VDD- (Vdate-IVthi)
Since the first transistor M1 operates in the saturation region, the driving current flowing through its channel is determined by the voltage difference between its gate and source. According to the current formula of the transistor saturation region (which can be approximately expressed as formula four):
[ equation four ]]：I＝K*(Vsg-Vth)2＝K*[VDD-(Vdate-IVthI)-IVthI]2
＝K*(VDD-Vdata)2。
In the formula four, I represents a driving current generated by the first transistor M1, that is, a driving current driving the organic light emitting element OLED, K represents a constant, for example, a process-related constant, Vdata represents a signal of the Data signal terminal Data, and VDD represents a signal of the first voltage signal terminal VDD.
As can be seen from the fourth equation, I is not affected by the threshold voltage Vth of the first transistor M1, and 7T1C can eliminate the influence of the threshold voltage Vth of the first transistor M1 on the driving current I, so that the display of each pixel is stable and uniform, and a good display effect is obtained.
The invention provides a display panel comprising the pixel circuit.
The display panel of the embodiment has the pixel circuit, and the threshold voltage of the first transistor is compensated through the mutual matching of the transistors and the capacitors, so that the driving current for driving the organic light-emitting element to emit light is unrelated to the threshold voltage of the first transistor, the influence of the fluctuation of the threshold voltage of the first transistor on the organic light-emitting element is avoided, the problem of uneven display brightness caused by the influence is solved, and the display effect of the whole picture is improved; in addition, the eighth transistor can reduce leakage current between the first storage capacitor and the second storage capacitor, and the reduction of the gate voltage of the first transistor is avoided, so that the problem of flicker caused by the leakage current is solved, and the display effect of the whole display picture is further improved.
Correspondingly, the invention also provides a display device which comprises the display panel.
In summary, in the pixel circuit, the driving method thereof, the display panel and the display device provided by the present invention, the pixel circuit includes eight transistors, two storage capacitors and one organic light emitting element, and the threshold voltage of the first transistor is compensated through the mutual cooperation of the transistors and the capacitors, so that the driving current for driving the organic light emitting element to emit light is unrelated to the threshold voltage of the first transistor, thereby avoiding the influence of the fluctuation of the threshold voltage of the first transistor on the organic light emitting element, solving the problem of uneven display brightness caused thereby, and improving the display effect of the whole screen; in addition, the eighth transistor can reduce leakage current between the first storage capacitor and the second storage capacitor, and the reduction of the grid voltage of the first transistor is avoided, so that the problem of flicker caused by the leakage current is solved, and the display effect of the whole display picture is further improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. A pixel circuit, comprising: first to eighth transistors, a first storage capacitor, a second storage capacitor, and an organic light emitting element; wherein,
the fourth transistor comprises a third sub transistor and a fourth sub transistor which are connected in series and is used for initializing the first storage capacitor by adopting a signal of an initialization signal end under the control of the first scanning signal end;
the second transistor and the third transistor are used for storing a signal of a data signal end and the threshold voltage of the first transistor into the first storage capacitor under the control of a second scanning signal end so as to compensate the threshold voltage of the first transistor;
the eighth transistor is used for storing a signal of a data signal terminal to the second storage capacitor under the control of the second scanning signal terminal so as to reduce a leakage current between the first storage capacitor and the second storage capacitor; a gate of the eighth transistor is connected to the second scan signal terminal, a first electrode of the eighth transistor is connected to the data signal terminal, a second electrode of the eighth transistor is connected to the first terminal of the second storage capacitor, the second electrode of the third sub-transistor, and the first electrode of the fourth sub-transistor, and a second terminal of the second storage capacitor is connected to the first voltage signal terminal;
the seventh transistor is used for initializing the organic light-emitting element by adopting a signal of the initialization signal end under the control of a third scanning signal end;
the fifth transistor is used for providing a signal of the first voltage signal terminal to the first transistor under the control of a control signal terminal;
the sixth transistor is used for enabling the first transistor and the organic light-emitting element to be conducted under the control of the control signal end;
the first storage capacitor is used for holding the grid voltage of the first transistor;
the first transistor is used for generating a driving current according to a signal of the data signal end so as to drive the organic light-emitting element to emit light.
2. The pixel circuit according to claim 1, wherein a gate of the fourth transistor is connected to the first scan signal terminal, a first electrode of the fourth transistor is connected to a first terminal of the first storage capacitor, a second electrode of the fourth transistor is connected to the initialization signal terminal, and a second terminal of the first storage capacitor is connected to the first voltage signal terminal; a gate of the seventh transistor is connected to the third scan signal terminal, a first electrode of the seventh transistor is connected to the initialization signal terminal, a second electrode of the seventh transistor is connected to an anode of the organic light emitting device, and a cathode of the organic light emitting device is connected to the second voltage signal terminal.
3. The pixel circuit according to claim 2, wherein a gate of the first transistor is connected to a first terminal of the first storage capacitor, a first electrode of the first transistor is connected to a first electrode of the second transistor, and a second electrode of the first transistor is connected to a first electrode of the third transistor; a gate of the second transistor is connected to the second scan signal terminal, and a second electrode of the second transistor is connected to the data signal terminal; the gate of the third transistor is connected to the second scan signal terminal, and the second electrode of the third transistor is connected to the first terminal of the storage capacitor.
4. The pixel circuit according to claim 3, wherein a gate of the fifth transistor is connected to the control signal terminal, a first electrode of the fifth transistor is connected to the first voltage signal terminal, and a second electrode of the fifth transistor is connected to the first electrode of the first transistor; a gate of the sixth transistor is connected to the control signal terminal, a first electrode of the sixth transistor is connected to the second electrode of the first transistor, and a second electrode of the sixth transistor is connected to an anode of the organic light emitting element.
5. The pixel circuit according to claim 1, wherein the third transistor comprises two sub-transistors connected in series, a gate of a first sub-transistor is connected to the second scan signal terminal, a first electrode of the first sub-transistor is connected to a second electrode of a second sub-transistor, and a second electrode of the first sub-transistor is connected to the first terminal of the first storage capacitor; the grid electrode of the second sub transistor is connected with the second scanning signal end, and the first electrode of the second sub transistor is connected with the second electrode of the first transistor.
6. The pixel circuit according to claim 1, wherein a gate of the third sub-transistor is connected to a first scan signal terminal, a first electrode of the third sub-transistor is connected to a first terminal of the first storage capacitor, and a second electrode of the third sub-transistor is connected to a first electrode of a fourth sub-transistor and a first terminal of the second storage capacitor; and the grid electrode of the fourth sub-transistor is connected with a first scanning signal end, and the second electrode of the fourth sub-transistor is connected with the initialization signal end.
7. A driving method of a pixel circuit, applied to the pixel circuit according to any one of claims 1 to 6, the driving method of the pixel circuit comprising:
the first stage is as follows: a first scanning signal end provides a low level signal, and a fourth transistor initializes the first storage capacitor by adopting a signal of an initialization signal end under the control of the first scanning signal end;
and a second stage: a second scanning signal end provides a low-level signal, and a second transistor and a third transistor store a signal of a data signal end and the threshold voltage of the first transistor to the first storage capacitor under the control of the second scanning signal end so as to compensate the threshold voltage of the first transistor; the eighth transistor stores a signal of a data signal terminal to the second storage capacitor under the control of the second scan signal terminal to reduce a leakage current between the first storage capacitor and the second storage capacitor;
and a third stage: the third scanning signal end provides a low-level signal, and the seventh transistor is used for initializing the organic light-emitting element by adopting a signal of the initialization signal end under the control of the third scanning signal end;
a fourth stage: the control signal end provides a low-level signal, the fifth transistor provides a signal of a first voltage signal end to the first transistor under the control of the control signal end, the sixth transistor enables the first transistor and the organic light-emitting element to be conducted under the control of the control signal end, the first storage capacitor keeps the grid voltage of the first transistor, and the first transistor generates a driving current according to a signal of the data signal end so as to drive the organic light-emitting element to emit light.
8. A display panel comprising the pixel circuit according to any one of claims 1 to 6.
9. A display device characterized by comprising the display panel according to claim 8.
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| CN109616051A (en) * | 2018-12-14 | 2019-04-12 | 昆山国显光电有限公司 | Display panel, pixel circuit and its driving method |
| CN109389946A (en) * | 2018-12-14 | 2019-02-26 | 昆山国显光电有限公司 | Display panel, pixel circuit and its driving method |
| KR102564366B1 (en) | 2018-12-31 | 2023-08-04 | 엘지디스플레이 주식회사 | Display apparatus |
| CN109637444B (en) * | 2019-01-10 | 2021-06-01 | 昆山国显光电有限公司 | Display device and driving method thereof |
| CN111179859B (en) * | 2020-03-16 | 2021-03-02 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display device |
| CN111508435B (en) * | 2020-04-29 | 2021-08-03 | 昆山国显光电有限公司 | Pixel driving circuit, display panel and terminal equipment |
| CN111445848B (en) * | 2020-04-30 | 2021-10-08 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display substrate |
| CN111445856B (en) | 2020-05-13 | 2021-04-09 | 京东方科技集团股份有限公司 | Driving circuit, driving method, display panel and display device |
| CN111627387B (en) * | 2020-06-24 | 2022-09-02 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, display panel and display device |
| CN111613177A (en) * | 2020-06-28 | 2020-09-01 | 上海天马有机发光显示技术有限公司 | Pixel circuit, driving method thereof, display panel and display device |
| CN112419967B (en) * | 2020-11-19 | 2022-04-12 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| US11721286B2 (en) | 2020-11-27 | 2023-08-08 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Pixel circuit and driving method thereof, display substrate and display device |
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