CN112489599B - AMOLED pixel driving circuit, driving method and display panel - Google Patents
AMOLED pixel driving circuit, driving method and display panel Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- 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
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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
- 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]
- G09G3/3275—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 provides an AMOLED pixel driving circuit, a driving method and a display panel, wherein the AMOLED pixel driving circuit comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a sixth thin film transistor (T6), a storage capacitor (C) and an Organic Light Emitting Diode (OLED); wherein the AMOLED pixel driving circuit only has a data signal writing and threshold voltage compensation phase (A1) and a light emitting phase (A2); the embodiment of the invention adopts the pixel driving circuit design with the 6T1C structure, completes compensation and AMOLED anode reset simultaneously through data signal writing, simplifies the driving time sequence, reduces the load of a scanning signal line, reduces signal attenuation, and further realizes the high refresh frequency of the AMOLED pixel driving circuit.
Description
Technical Field
The invention relates to the technical field of display, in particular to an AMOLED pixel driving circuit, an AMOLED pixel driving method and a display panel.
Background
An Active Matrix Organic Light Emitting Diode (OLED) Display panel has many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, a viewing angle of nearly 180 °, wide temperature range, and capability of realizing flexible Display and large-area full-color Display, and is considered as a Display device with the greatest potential for development in the industry. The AMOLED display panel is internally provided with a plurality of pixels which are arranged in an array manner, and each pixel is driven by an OLED pixel driving circuit. Since the threshold voltage Vth of the driving thin film transistor is likely to drift, the driving current is likely to change, which is likely to cause luminance unevenness of the AMOLED display panel, thereby causing display defects and affecting image quality. Display manufacturers have proposed pixel driving circuits with 7T1C structure that can compensate for the threshold voltage of the driving tft.
As shown in fig. 1A, the conventional AMOLED pixel driving circuit has a 7T1C structure, and includes 7 thin film transistors (T1, T2, T3, T4, T5, T6, T7) and 1 storage capacitor (C1). As shown in fig. 1B, the timing diagram of the operation of various signals for the pixel driving circuit is in the 7T1C configuration. The working time sequence of the pixel driving circuit with the 7T1C structure is divided into three stages, the first stage is a reset stage (Step1), and the effect of resetting the anode of the OLED and the gate of the driving thin film transistor T1 is realized by turning on the fourth thin film transistor T4 and the seventh thin film transistor T7; the second phase is a compensation and DATA writing phase (Step2), in which the driving TFT T1, the second TFT T2 and the third TFT T3 are turned on, and the threshold voltage Vth of the driving TFT T1 and the DATA signal DATA voltage are written into the first node A; the third phase is a light emitting phase (Step3), and the fifth thin film transistor T5 and the sixth thin film transistor T6 are turned on to complete light emission. Since the three stages are sequentially performed to complete the light emission of one row of pixels, it is difficult to increase the refresh frequency of the pixels. On the other hand, because the number of thin film transistors in the current pixel circuit is large, each pixel needs at least three scanning lines (a scanning signal line Scan, a light-emitting control line EM, and a Reset signal line Reset), so that the parasitic capacitance on each scanning line and each data line is large, and the signal attenuation is large due to the overlarge load of the wiring, which is also a reason why the refresh rate cannot be improved.
Therefore, how to increase the refresh frequency of the AMOLED pixel driving circuit in the prior art is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides an AMOLED pixel driving circuit, a driving method and a display panel, which are used for improving the refreshing frequency of the AMOLED pixel driving circuit.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
the embodiment of the invention provides an AMOLED pixel driving circuit, which comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a sixth thin film transistor (T6), a storage capacitor (C) and an Organic Light Emitting Diode (OLED), wherein the first thin film transistor (T1) is a driving thin film transistor;
the gate (g) of the first thin film transistor (T1) is electrically connected to the first node (P1), the source(s) is electrically connected to the second node (P2), and the drain (d) is electrically connected to the third node (P3);
the grid electrode of the second thin film transistor (T2) is connected with a light-emitting control signal (EM), the source electrode is connected with a power supply positive Voltage (VDD), and the drain electrode is electrically connected with the second node (P2);
the grid electrode of the third thin film transistor (T3) is connected with a scanning control signal (Scan), the source electrode is electrically connected with the first node (P1), and the drain electrode is electrically connected with the third node (P3);
the gate of the fourth thin film transistor (T4) is connected to the emission control signal (EM), the source is electrically connected to the third node (P3), and the drain is electrically connected to the fourth node (P4);
the grid electrode of the fifth thin film transistor (T5) is connected to the scanning control signal (Scan), the source electrode is connected to the DATA signal (DATA), and the drain electrode is electrically connected to the fourth node (P4);
the grid electrode of the sixth thin film transistor (T6) is connected to the scanning control signal (Scan), the source electrode is connected to the DATA signal (DATA), and the drain electrode is electrically connected to the second node (P2);
one end of the storage capacitor (C) is electrically connected to the first node (P1), and the other end is electrically connected to the second node (P2);
the anode of the Organic Light Emitting Diode (OLED) is electrically connected with the fourth node (P4), and the cathode is connected with a power supply negative Voltage (VSS);
the AMOLED pixel driving circuit is provided with a data signal writing and threshold voltage compensation phase (A1) and a light-emitting phase (A2); when the AMOLED pixel driving circuit is in a data signal writing and threshold voltage compensation phase (a1), the first thin film transistor (T1), the third thin film transistor (T3), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are turned on, and the second thin film transistor (T2) and the fourth thin film transistor (T4) are turned off; when the AMOLED pixel driving circuit is in a light-emitting phase (A2), the first thin film transistor (T1), the second thin film transistor (T2) and the fourth thin film transistor (T4) are turned on, and the third thin film transistor (T3), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are turned off.
In some embodiments, the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are all P-type thin film transistors; in the data signal writing and threshold voltage compensation phase (a1), the Scan control signal (Scan) is at a low potential, and the emission control signal (EM) is at a high potential; in the light emission period (a2), the emission control signal (EM) is at a low potential, and the Scan control signal (Scan) is at a high potential.
In some embodiments, the Scan control signal (Scan) and the emission control signal (EM) are both generated by an external timing controller.
In some embodiments, the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are each at least one of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor, and an amorphous silicon thin film transistor.
An embodiment of the present invention further provides an AMOLED pixel driving method, configured to drive the AMOLED pixel driving circuit, where the method includes the following steps:
s10, controlling the AMOLED pixel driving circuit to be in a data signal writing and threshold voltage compensation stage (A1); the third thin film transistor (T3), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are turned on, and the second thin film transistor (T2) is turned off from the fourth thin film transistor (T4); the DATA signal (DATA) is written into the first node (P1) and the fourth node (P4), and a gate (g) and a drain (d) of the first thin film transistor (T1) are shorted to form a diode structure; the DATA signal (DATA) is written into a source(s) of the first thin film transistor (T1), and a gate (g) of the first thin film transistor (T1) is charged; at the same time, the potential of the anode of the Organic Light Emitting Diode (OLED) is reset to the DATA signal (DATA);
s20, controlling the AMOLED pixel driving circuit to be in a light-emitting stage (A2); the first thin film transistor (T1), the second thin film transistor (T2) and the fourth thin film transistor (T4) are turned on, and the third thin film transistor (T3), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are turned off; the third thin film transistor (T3) blocks a connection path of the fourth thin film transistor (T4) and the gate (g) of the first thin film transistor (T1); the Organic Light Emitting Diode (OLED) is driven to emit light by the driving current flowing through the Organic Light Emitting Diode (OLED), and the driving current is independent of the threshold voltage of the first thin film transistor (T1).
In some embodiments, the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are all P-type thin film transistors; in S10, the Scan control signal (Scan) is at a low potential, and the emission control signal (EM) is at a high potential; in S20, the emission control signal (EM) is at a low potential, and the Scan control signal (Scan) is at a high potential.
In some embodiments, in the S10, the voltage of the first node (P1) is a sum of the voltage (Vdata) of the DATA signal (DATA) and the threshold voltage (Vth _ T1) of the first thin film transistor (T1), and the voltage of the fourth node (P4) is the voltage (Vdata) of the DATA signal (DATA).
In some embodiments, in S20, the driving current of the Organic Light Emitting Diode (OLED) is k (Vdata-VDD) 2 Where k is a current amplification factor of the first thin film transistor (T1), Vdata is a voltage of the DATA signal (DATA), and VDD is a power positive voltage.
In some embodiments, the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are respectively selected from any one of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor, and an amorphous silicon thin film transistor.
The invention also provides a display panel comprising the AMOLED pixel driving circuit.
According to the AMOLED pixel driving circuit, the driving method and the display panel, the pixel driving circuit design with the 6T1C structure is adopted, compensation and AMOLED anode reset are completed simultaneously through data signal writing, the driving time sequence is simplified, the load of a scanning signal line is reduced, signal attenuation is reduced, and the high refreshing frequency of the AMOLED pixel driving circuit is further realized.
Drawings
The following detailed description of embodiments of the present application is provided in conjunction with the appended drawings.
Fig. 1A is an equivalent circuit diagram of a pixel driving circuit with a 7T1C structure provided in the prior art.
Fig. 1B is a signal timing diagram of a pixel driving circuit with a 7T1C structure provided in the prior art.
Fig. 2 is an equivalent circuit diagram of a pixel driving circuit with a 6T1C structure according to an embodiment of the present invention.
Fig. 3 is a signal timing diagram of a pixel driving circuit with a 6T1C structure according to an embodiment of the present invention.
Fig. 4 is a flowchart of a driving method of the AMOLED pixel driving circuit according to an embodiment of the present invention.
Detailed Description
The invention provides an AMOLED pixel driving circuit, a driving method and a display panel, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present invention.
The embodiment of the invention aims at the technical problem that the pixel driving circuit with the 7T1C structure, which can compensate the threshold voltage of the driving thin film transistor, has low refreshing frequency, and can solve the defect.
Referring to fig. 2 and fig. 3, an embodiment of the invention first provides a pixel driving circuit with a 6T1C (6 tfts and 1 storage capacitor) structure. The pixel driving circuit comprises a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a fourth thin film transistor T4, a fifth thin film transistor T5, a sixth thin film transistor T6, a storage capacitor C and an organic light emitting diode OLED, wherein the first thin film transistor T1 is a driving thin film transistor;
the gate g of the first thin film transistor T1 is electrically connected to the first node P1, the source s is electrically connected to the second node P2, and the drain d is electrically connected to the third node P3;
the grid electrode of the second thin film transistor T2 is connected with a light-emitting control signal EM, the source electrode is connected with a power supply positive voltage VDD, and the drain electrode is electrically connected with the second node P2;
a gate of the third thin film transistor T3 is connected to a Scan control signal Scan, a source thereof is electrically connected to the first node P1, and a drain thereof is electrically connected to the third node P3;
a gate of the fourth thin film transistor T4 is connected to the emission control signal EM, a source thereof is electrically connected to the third node P3, and a drain thereof is electrically connected to the fourth node P4;
a gate of the fifth thin film transistor T5 is connected to the Scan control signal Scan, a source is connected to the DATA signal DATA, and a drain is electrically connected to the fourth node P4;
a gate of the sixth thin film transistor T6 is connected to the Scan control signal Scan, a source is connected to the DATA signal DATA, and a drain is electrically connected to the second node P2;
one end of the storage capacitor C is electrically connected to the first node P1, and the other end is electrically connected to the second node P2;
the anode of the organic light emitting diode OLED is electrically connected with the fourth node P4, and the cathode of the organic light emitting diode OLED is connected with a power supply negative voltage VSS;
the AMOLED pixel driving circuit is provided with a data signal writing and threshold voltage compensation phase A1 and a light-emitting phase A2; when the AMOLED pixel driving circuit is in a data signal writing and threshold voltage compensation phase a1, the first thin film transistor T1, the third thin film transistor T3, the fifth thin film transistor T5 and the sixth thin film transistor T6 are turned on, and the second thin film transistor T2 and the fourth thin film transistor T4 are turned off; when the AMOLED pixel driving circuit is in the light emitting phase a2, the first thin film transistor T1, the second thin film transistor T2 and the fourth thin film transistor T4 are turned on, and the third thin film transistor T3, the fifth thin film transistor T5 and the sixth thin film transistor T6 are turned off.
Referring to fig. 3, the AMOLED pixel driving circuit has a data signal writing and threshold voltage compensation phase a1 and a light emitting phase a 2.
As can be seen from fig. 2 and 3, the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, the fifth thin film transistor T5 and the sixth thin film transistor T6 are all P-type thin film transistors.
During the data signal write and threshold voltage compensation phase a 1: the Scan control signal Scan maintains a low potential, the emission control signal EM maintains a high potential, and the power supply negative voltage VSS maintains a high potential; the third tft T3, the fifth tft T5 and the sixth tft T6 are turned on, and the DATA signal DATA is written into the first node P1 and the fourth node P4, respectively, where the first tft T1 is turned on; the emission control signal EM is at a high potential, and the second thin film transistor T2 is disconnected from the fourth thin film transistor T4.
The gate g and the drain d of the first thin film transistor T1 are shorted by the turned-on third thin film transistor T3 to form a diode structure; the DATA signal DATA is written to the source s of the first thin film transistor T1 through the turned-on sixth thin film transistor T6, the gate voltage of the first thin film transistor T1 is compensated by the diode structure of the first thin film transistor T1, and the gate g of the first thin film transistor T1 is charged to: vg is V DATA +Vth_T1；
Wherein Vg represents the potential of the gate g of the first thin film transistor T1, V DATA Which represents the potential of the DATA signal DATA,vth _ T1 represents a threshold voltage of the first thin film transistor T1, i.e., the driving thin film transistor.
At the same time, the potential of the anode of the organic light emitting diode OLED is reset to the potential of the DATA signal DATA through the turned-on fifth thin film transistor T5.
In the lighting phase a 2: the scanning control signal Scan is converted into a high potential, the light-emitting control signal EM is converted into a low potential, and the power supply negative voltage VSS is converted into a low potential; the third, fifth and sixth thin film transistors T3, T5 and T6 are turned off, the second and fourth thin film transistors T2 and T4 are turned on, and the first thin film transistor T1 is turned on.
Since the second thin film transistor T2 is turned on, the potential of the source s of the first thin film transistor T1 is a power supply positive voltage VDD; the driving current flows to the organic light emitting diode OLED through the turned-on fourth thin film transistor T4, so as to drive the organic light emitting diode OLED to emit light, and the known formula for calculating the driving current is: i is OLED ＝k*(Vgs_T1–Vth_T1) 2 ；
Wherein I OLED K is a current amplification factor of the first thin film transistor T1, i.e., a driving thin film transistor, and is determined by the electrical characteristics of the first thin film transistor T1 itself, Vgs _ T1 is a voltage difference between the gate g and the source s of the first thin film transistor T1, and Vth _ T1 is a threshold voltage of the first thin film transistor T1, i.e., a driving thin film transistor.
The gate g of the first thin film transistor T1 has a voltage Vg ═ V DATA + Vth _ T1, the voltage of the source s of the first thin film transistor T1 is the positive power supply voltage VDD, so the driving current of the AMOLED pixel driving circuit is:
I OLED ＝k*(V DATA +Vth_T1–VDD–Vth_T1) 2 ＝k*(V DATA –VDD) 2 ；
as can be seen, the drive current I of the AMOLED pixel drive circuit OLED And a threshold of the first thin film transistor T1, i.e., the driving thin film transistorThe value voltage Vth _ T1 is irrelevant, so the AMOLED pixel driving circuit of the present invention can compensate for the threshold voltage shift of the driving thin film transistor.
Preferably, the Scan control signal Scan and the emission control signal EM are both generated by an external timing controller.
Preferably, the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, the fifth thin film transistor T5 and the sixth thin film transistor T6 are each at least one of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor and an amorphous silicon thin film transistor.
It is noted that, compared with the pixel driving circuit with the 7T1C structure in the prior art, the AMOLED pixel driving circuit of the present invention reduces the number of thin film transistors to 6, and the number of Scan lines to 2 (Scan control signal Scan and emission control signal EM), thereby reducing the load of signal lines and reducing signal attenuation. Meanwhile, the AMOLED pixel driving circuit only has two driving stages, namely a data signal writing and threshold voltage compensation stage A1 and a light emitting stage A2, and the data signal writing and compensation and resetting in the threshold voltage compensation stage A1 are completed synchronously without mutual interference, the driving time sequence is simple, and the high refresh frequency of the AMOLED pixel driving circuit is easy to realize.
As shown in fig. 4, the present invention further provides an AMOLED pixel driving method, for driving the AMOLED pixel driving circuit, including the following steps:
s10, controlling the AMOLED pixel driving circuit to be in a data signal writing and threshold voltage compensation phase A1; the third thin film transistor T3, the fifth thin film transistor T5, and the sixth thin film transistor T6 are turned on, and the second thin film transistor T2 is turned off from the fourth thin film transistor T4; the DATA signal DATA is written into the first node P1 and the fourth node P4, and the gate g and the drain d of the first thin film transistor T1 are shorted to form a diode structure; the DATA signal DATA is written into the source s of the first thin film transistor T1, and the gate g of the first thin film transistor T1 is charged; at the same time, the potential of the anode of the organic light emitting diode OLED is reset to the DATA signal DATA;
s20, controlling the AMOLED pixel driving circuit to be in a light-emitting stage A2; the first thin film transistor T1, the second thin film transistor T2 and the fourth thin film transistor T4 are turned on, and the third thin film transistor T3, the fifth thin film transistor T5 and the sixth thin film transistor T6 are turned off; the third thin film transistor T3 blocks a connection path of the fourth thin film transistor T4 and the gate g of the first thin film transistor T1; the driving current flowing through the organic light emitting diode OLED drives the organic light emitting diode OLED to emit light, and the driving current is independent of the threshold voltage of the first thin film transistor T1.
For a specific driving method of the AMOLED pixel driving method provided in the embodiment of the present invention, reference may be made to the foregoing embodiment, which is not described in detail in this embodiment.
Preferably, the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, the fifth thin film transistor T5 and the sixth thin film transistor T6 are P-type thin film transistors; in S10, the Scan control signal Scan is at a low potential, and the emission control signal EM is at a high potential; in S20, the emission control signal EM is at a low potential, and the Scan control signal Scan is at a high potential.
Preferably, in S10, the voltage of the first node P1 is a sum of the voltage Vdata of the DATA signal DATA and the threshold voltage Vth _ T1 of the first thin film transistor T1, and the voltage of the fourth node P4 is the voltage Vdata of the DATA signal DATA.
Preferably, in S20, the driving current of the organic light emitting diode OLED is k (Vdata-VDD) 2 Where k is a current amplification factor of the first thin film transistor T1, Vdata is a voltage of the DATA signal DATA, and VDD is a positive power supply voltage.
Preferably, the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, the fifth thin film transistor T5 and the sixth thin film transistor T6 are each at least one of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor and an amorphous silicon thin film transistor.
The present invention also provides a display panel, which may be but not limited to an OLED display panel, including the AMOLED pixel driving circuit shown in fig. 2 and 3. The AMOLED pixel driving circuit can compensate the threshold voltage drift of the driving thin film transistor, and can complete compensation and anode reset of the organic light emitting diode OLED simultaneously through DATA signal DATA writing, so that the driving time sequence is simplified, and high refresh frequency is easy to realize.
In summary, the AMOLED pixel driving circuit, the driving method and the display panel provided in the embodiments of the present invention adopt a pixel driving circuit design with a 6T1C structure, and complete compensation and AMOLED anode reset at the same time through data signal writing, thereby simplifying driving timing, reducing load of scanning signal lines, reducing signal attenuation, and further realizing high refresh frequency of the AMOLED pixel driving circuit.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The AMOLED pixel driving circuit, the driving method, and the display panel provided in the embodiments of the present application are introduced in detail, and a specific example is applied to illustrate the principle and the implementation of the present application, and the description of the embodiments is only used to help understand the technical scheme and the core concept of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. An AMOLED pixel driving circuit is characterized by comprising a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a sixth thin film transistor (T6), a storage capacitor (C) and an Organic Light Emitting Diode (OLED), wherein the first thin film transistor (T1) is a driving thin film transistor;
the grid (g) of the first thin film transistor (T1) is electrically connected with a first node (P1), the source(s) is electrically connected with a second node (P2), and the drain (d) is electrically connected with a third node (P3);
the grid electrode of the second thin film transistor (T2) is connected with a light-emitting control signal (EM), the source electrode is connected with a power supply positive Voltage (VDD), and the drain electrode is electrically connected with the second node (P2);
the grid electrode of the third thin film transistor (T3) is connected with a scanning control signal (Scan), the source electrode is electrically connected with the first node (P1), and the drain electrode is electrically connected with the third node (P3);
the gate of the fourth thin film transistor (T4) is connected to the emission control signal (EM), the source is electrically connected to the third node (P3), and the drain is electrically connected to the fourth node (P4);
the grid electrode of the fifth thin film transistor (T5) is connected to the scanning control signal (Scan), the source electrode is connected to the DATA signal (DATA), and the drain electrode is electrically connected to the fourth node (P4);
the grid electrode of the sixth thin film transistor (T6) is connected to the scanning control signal (Scan), the source electrode is connected to the DATA signal (DATA), and the drain electrode is electrically connected to the second node (P2);
one end of the storage capacitor (C) is electrically connected to the first node (P1), and the other end is electrically connected to the second node (P2);
the anode of the Organic Light Emitting Diode (OLED) is electrically connected with the fourth node (P4), and the cathode is connected with a power supply negative Voltage (VSS);
the AMOLED pixel driving circuit is provided with a data signal writing and threshold voltage compensation phase (A1) and a light-emitting phase (A2);
when the AMOLED pixel driving circuit is in a DATA signal writing and threshold voltage compensation phase (a1), the first thin film transistor (T1), the third thin film transistor (T3), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are turned on, the second thin film transistor (T2) and the fourth thin film transistor (T4) are turned off, the Scan control signal (Scan) is at a low potential, the emission control signal (EM) is at a high potential, the DATA signal (DATA) is written into the source(s) of the first thin film transistor (T1), and the gate (g) of the first thin film transistor (T1) is charged; at the same time, the potential of the anode of the Organic Light Emitting Diode (OLED) is reset to the DATA signal (DATA);
when the AMOLED pixel driving circuit is in a light-emitting phase (A2), the first thin film transistor (T1), the second thin film transistor (T2) and the fourth thin film transistor (T4) are turned on, and the third thin film transistor (T3), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are turned off; the emission control signal (EM) is at a low potential, and the Scan control signal (Scan) is at a high potential.
2. An AMOLED pixel driving circuit according to claim 1, wherein the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are all P-type thin film transistors.
3. An AMOLED pixel drive circuit according to claim 2, wherein the Scan control signal (Scan) and the emission control signal (EM) are both generated by an external timing controller.
4. The AMOLED pixel driving circuit as claimed in claim 1, wherein the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are all at least one of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor and an amorphous silicon thin film transistor.
5. An AMOLED pixel driving method for driving the AMOLED pixel driving circuit as claimed in any one of claims 1-4, the method comprising the steps of:
s10, controlling the AMOLED pixel driving circuit to be in a data signal writing and threshold voltage compensation stage (A1); the third thin film transistor (T3), the fifth thin film transistor (T5), and the sixth thin film transistor (T6) are turned on, and the second thin film transistor (T2) is turned off from the fourth thin film transistor (T4); the DATA signal (DATA) is written into the first node (P1) and the fourth node (P4), and a gate (g) and a drain (d) of the first thin film transistor (T1) are shorted to form a diode structure; the DATA signal (DATA) is written into a source(s) of the first thin film transistor (T1), and a gate (g) of the first thin film transistor (T1) is charged; at the same time, the potential of the anode of the Organic Light Emitting Diode (OLED) is reset to the DATA signal (DATA);
s20, controlling the AMOLED pixel driving circuit to be in a light-emitting stage (A2); the first thin film transistor (T1), the second thin film transistor (T2) and the fourth thin film transistor (T4) are turned on, and the third thin film transistor (T3), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are turned off; the third thin film transistor (T3) blocks a connection path of the fourth thin film transistor (T4) and the gate (g) of the first thin film transistor (T1); the Organic Light Emitting Diode (OLED) is driven to emit light by the driving current flowing through the Organic Light Emitting Diode (OLED), and the driving current is independent of the threshold voltage of the first thin film transistor (T1).
6. An AMOLED pixel driving method as claimed in claim 5, wherein the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are all P-type thin film transistors; in S10, the Scan control signal (Scan) is at a low potential, and the emission control signal (EM) is at a high potential; in S20, the emission control signal (EM) is at a low potential, and the Scan control signal (Scan) is at a high potential.
7. The AMOLED pixel driving method according to claim 5, wherein in the S10, the voltage of the first node (P1) is the sum of the voltage (Vdata) of the DATA signal (DATA) and the threshold voltage (Vth _ T1) of the first thin film transistor (T1), and the voltage of the fourth node (P4) is the voltage (Vdata) of the DATA signal (DATA).
8. An AMOLED pixel driving method as claimed in claim 5, wherein in S20, the driving current of the Organic Light Emitting Diode (OLED) is k (Vdata-VDD) 2 Where k is a current amplification factor of the first thin film transistor (T1), Vdata is a voltage of the DATA signal (DATA), and VDD is a power positive voltage.
9. The AMOLED pixel driving method as claimed in claim 5, wherein the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are respectively selected from any one of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor and an amorphous silicon thin film transistor.
10. A display panel comprising the AMOLED pixel driving circuit of any one of claims 1-4.
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