CN106409233B - A kind of pixel circuit, its driving method and organic light emitting display panel - Google Patents
A kind of pixel circuit, its driving method and organic light emitting display panel Download PDFInfo
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- CN106409233B CN106409233B CN201611067423.0A CN201611067423A CN106409233B CN 106409233 B CN106409233 B CN 106409233B CN 201611067423 A CN201611067423 A CN 201611067423A CN 106409233 B CN106409233 B CN 106409233B
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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]
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- 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
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- 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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Abstract
The invention discloses a kind of pixel circuit, its driving method and organic light emitting display panels, wherein include Data write. module, threshold value compensation module, light emitting control module, reseting module, driving transistor, light emitting diode and diverter module in pixel circuit；Since threshold value compensation module can carry out threshold compensation to driving transistor, so as to compensate the threshold voltage shift of driving transistor, influence of the threshold voltage to light emitting diode is avoided, and then improve the uniformity of display picture brightness.And, due to being additionally provided with and the second diverter module being extremely connected of driving transistor, in this way when needing light emitting diode is dark-state, the leakage current for driving transistor can be branched under the control of the 4th scanning signal and shunt end, so as to improve the problem that dark-state existing for existing pixel circuit is not dark.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and an organic light emitting display panel.
Background
Organic Light Emitting Diode (OLED) is one of the hot spots in the research field of flat panel displays, and compared with liquid crystal displays, OLED has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, etc., and at present, OLED has begun to replace the conventional LCD display screen in the display fields of mobile phones, PDAs, digital cameras, etc. The pixel circuit design is the core technical content of the OLED display, and has important research significance.
Unlike LCDs, which control brightness using a stable voltage, OLEDs are current driven and require a stable current to control light emission. The threshold voltage V of the driving transistor of the pixel circuit is reduced due to aging of the device and the processthThe non-uniformity exists, so that the current flowing through each pixel point OLED is changed, the display brightness is not uniform, and the display effect of the whole image is influenced.
E.g., conventional 2T1C, as shown in fig. 1As shown, the circuit is composed of 1 driving transistor T2, a switching transistor T1 and a storage capacitor Cs, when a Scan line Scan selects a certain row, the Scan line Scan inputs a low level signal, the P-type switching transistor T1 is turned on, and the voltage of the Data line Data is written in the storage capacitor Cs; after the line scanning is finished, the signal input by the Scan line Scan changes to a high level, the P-type switching transistor T1 is turned off, and the gate voltage stored in the storage capacitor Cs enables the driving transistor T2 to generate a current to drive the OLED, thereby ensuring that the OLED continuously emits light in one frame. Wherein, the saturation current formula of the driving transistor T2 is IOLED＝K(VSG-Vth)2As described above, the threshold voltage V of the driving transistor T2 is generated due to the process and the device agingthWill drift, which results in a current through each OLED due to the threshold voltage V of the drive transistorthAnd thus cause image brightness non-uniformity.
In order to compensate for the threshold voltage shift of the driving transistor, the conventional pixel circuit generally adds some switching transistors to the conventional pixel circuit, and the threshold voltage is compensated before the pixel circuit controls the OLED to display. However, in the conventional pixel circuit, when threshold voltage compensation is performed, leakage current flows to the OLED from the driving transistor, so that a dark state is not dark, and display quality is greatly affected.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a driving method thereof, and an organic light emitting display panel, which are used to improve the problem of dark state on the basis of improving the uniformity of the brightness of a display screen.
An embodiment of the present invention provides a pixel circuit, including: the device comprises a data writing module, a threshold compensation module, a light emitting control module, a reset module, a driving transistor, a light emitting diode and a shunting module; wherein,
the reset module is connected with the grid electrode of the driving transistor and is used for resetting the grid electrode of the driving transistor under the control of a first scanning signal; the threshold compensation module is respectively connected with the grid electrode of the driving transistor, the first pole of the driving transistor, the data writing module and the first power supply voltage end and is used for performing threshold compensation on the driving transistor under the control of the first scanning signal; the data writing module is used for providing data signals to the pixel circuit under the control of a second scanning signal; the light-emitting control module is respectively connected with the first pole of the driving transistor and the first power supply voltage end and is used for enabling the first power supply voltage end and the first pole of the driving transistor to be in a conducting state under the control of a third scanning signal; the shunt module is respectively connected with the second pole of the driving transistor and the shunt end and is used for shunting the leakage current of the driving transistor to the shunt end under the control of a fourth scanning signal; the light emitting diode is connected between a second power voltage end and the second pole of the driving transistor.
Correspondingly, the embodiment of the invention also provides an organic light-emitting display panel which comprises any one of the pixel circuits provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a driving method of any one of the pixel circuits, including:
in a first time period, the reset module resets the grid electrode of the driving transistor under the control of a first scanning signal; the shunting module shunts the drain current of the driving transistor to the shunting end under the control of a fourth scanning signal;
in a second time period, the reset module resets the grid electrode of the driving transistor under the control of the first scanning signal; the light-emitting control module makes the first power voltage end and the first electrode of the driving transistor be in a conducting state under the control of a third scanning signal; the threshold compensation module is used for performing threshold compensation on the driving transistor under the control of the first scanning signal; the shunting module shunts the drain current of the driving transistor to the shunting end under the control of a fourth scanning signal;
in a third time period, the data writing module provides a data signal to the pixel circuit under the control of a second scanning signal;
in a fourth time period, the light-emitting control module makes the first power voltage end and the first electrode of the driving transistor in a conducting state under the control of a third scanning signal; the light emitting diode emits light.
The invention has the following beneficial effects:
the pixel circuit, the driving method thereof and the organic light emitting display panel provided by the embodiment of the invention comprise a data writing module, a threshold compensation module, a light emitting control module, a reset module, a driving transistor, a light emitting diode and a shunt module; the threshold compensation module can compensate the threshold of the driving transistor, so that the threshold voltage drift of the driving transistor can be compensated, the influence of the threshold voltage on the light emitting diode is avoided, and the uniformity of the brightness of a display picture is improved. In addition, as the shunt module connected with the second pole of the driving transistor is also arranged, when the light emitting diode is required to be in a dark state, the leakage current of the driving transistor can be shunted to the shunt end under the control of the fourth scanning signal, so that the problem that the dark state of the existing pixel circuit is not dark is solved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional pixel circuit;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 8 is a circuit timing diagram corresponding to the pixel circuit shown in FIG. 4;
FIG. 9 is a circuit timing diagram corresponding to the pixel circuit shown in FIG. 6;
fig. 10 is a flowchart of a driving method of a pixel circuit according to an embodiment of the invention.
Detailed Description
Embodiments of a pixel circuit, a driving method thereof, and an organic light emitting display panel according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2, a pixel circuit according to an embodiment of the present invention includes: the device comprises a data writing module 1, a threshold compensation module 2, a light-emitting control module 3, a reset module 4, a driving transistor M0, a light-emitting diode oled and a shunt module 5; wherein,
the reset module 4 is connected to the gate of the driving transistor M0, and is configured to reset the gate of the driving transistor M0 under the control of the first Scan signal Scan 1;
the threshold compensation module 2 is respectively connected to the gate of the driving transistor M0, the first pole of the driving transistor M0, the data write module 1, and the first power voltage terminal VDD, and is configured to perform threshold compensation on the driving transistor M0 under the control of the first Scan signal Scan 1;
the data writing module 1 is used for providing a data signal Vdata to the pixel circuit under the control of a second Scan signal Scan 2;
the light emitting control module 3 is respectively connected to the first electrode of the driving transistor M0 and the first power voltage terminal VDD, and is configured to make the first power voltage terminal VDD and the first electrode of the driving transistor M0 in a conducting state under the control of the third Scan signal Scan 3;
the shunt module 5 is respectively connected to the second pole of the driving transistor M0 and the shunt terminal Vss, and is configured to shunt the drain current of the driving transistor M0 to the shunt terminal Vss under the control of the fourth Scan signal Scan 4;
the led oled is connected between the second power voltage terminal VEE and the second pole of the driving transistor M0.
The pixel circuit provided by the embodiment of the invention comprises a data writing module, a threshold compensation module, a light emitting control module, a reset module, a driving transistor, a light emitting diode and a shunting module; the threshold compensation module can compensate the threshold of the driving transistor, so that the threshold voltage drift of the driving transistor can be compensated, the influence of the threshold voltage on the light emitting diode is avoided, and the uniformity of the brightness of a display picture is improved. In addition, as the shunt module connected with the second pole of the driving transistor is also arranged, when the light emitting diode is required to be in a dark state, the leakage current of the driving transistor can be shunted to the shunt end under the control of the fourth scanning signal, so that the problem that the dark state of the existing pixel circuit is not dark is solved.
In a specific implementation, in the pixel circuit provided in the embodiment of the present invention, the shunting terminal needs to meet a requirement that when the driving transistor is turned on, a potential of the shunting terminal is less than a potential of the second pole of the driving transistor, so that the leakage current of the driving transistor can be shunted to the shunting terminal.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the shunting terminal Vss and the second power voltage terminal VEE are the same terminal, and the current leakage of the driving transistor M0 is shunted through the second power voltage terminal VEE, so that circuit layout can be reduced.
It should be noted that, in the pixel circuit provided in the embodiment of the present invention, the driving transistor is a P-type transistor, and the principle of the driving transistor being an N-type transistor is the same, but when the driving transistor is an N-type transistor, the anode of the light emitting diode needs to be connected to the first power supply voltage terminal, but the pixel circuit is not limited thereto. When the driving transistor is a P-type transistor, the threshold voltage V is increased due to the P-type transistorthNegative, in order to ensure the driving transistor M0 can work normally, the voltage of the first power voltage terminal is generally higher than the voltage of the second power voltage terminal, and the first terminal of the driving transistor is the source and the second terminal of the driving transistor is the drain.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is for better explaining the present invention, but not limiting the present invention.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the threshold compensation module 2 includes a first transistor M1, a first capacitor C1, and a second capacitor C2; wherein,
a first end of the first capacitor C1 is connected to the gate of the driving transistor M0, and a second end of the first capacitor C1 is connected to the first end of the second capacitor C2, the first pole of the first transistor M1 and the data writing module 1, respectively; a second terminal of the second capacitor C2 is connected to the first power supply voltage terminal VDD; the second pole of the first transistor M1 is connected to the first pole of the driving transistor M0, and the gate of the first transistor M1 is used for receiving the first Scan signal Scan 1.
The above is merely an example of the specific structure of the threshold compensation module in the pixel circuit, and in the specific implementation, the specific structure of the threshold compensation module is not limited to the above structure provided by the embodiment of the present invention, and may also be other structures known by those skilled in the art, and is not limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the data writing module 1 includes a second transistor M2; wherein,
the gate of the second transistor M2 is used for receiving the second Scan signal Scan2, the first pole of the second transistor M2 is used for receiving the data signal Vdata, and the second pole of the second transistor M2 is connected to the threshold compensation module 2.
The above is merely an example of the specific structure of the data writing module in the pixel circuit, and in the specific implementation, the specific structure of the data writing module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, which is not limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the reset module 4 includes a third transistor M3; wherein,
the gate of the third transistor M3 is used for receiving the first Scan signal Scan1, the first pole of the third transistor M3 is used for receiving the reference signal Vref, and the second pole of the third transistor M3 is connected to the gate of the driving transistor M0.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, the potential of the reference signal Vref needs to be sufficient to enable the driving transistor to be turned on.
The above is merely an example of the specific structure of the reset module in the pixel circuit, and in the specific implementation, the specific structure of the reset module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the light emission control module 3 includes a fourth transistor M4; wherein,
a gate of the fourth transistor M4 is for receiving the third Scan signal Scan3, a first pole of the fourth transistor M4 is connected to the first power voltage terminal VDD, and a second pole of the fourth transistor M4 is connected to the first pole of the driving transistor M0.
The above is merely an example of the specific structure of the light emission control module in the pixel circuit, and in the specific implementation, the specific structure of the light emission control module is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the current dividing module 5 includes a fifth transistor M5; wherein,
the gate of the fifth transistor M5 is used for receiving the fourth Scan signal Scan4, the first pole of the fifth transistor M5 is connected to the second pole of the driving transistor M0, and the second pole of the fifth transistor M5 is connected to the shunt terminal VSS (the shunt terminal VSS and the second power voltage terminal VEE are the same in fig. 4).
The above is merely an example of the specific structure of the shunting module in the pixel circuit, and in the specific implementation, the specific structure of the shunting module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
Further, in the pixel circuit according to the embodiment of the invention, as shown in fig. 5, the first Scan signal Scan1 and the fourth Scan signal Scan4 are the same signal. Since the first Scan signal Scan1 and the fourth Scan signal Scan4 are the same signal, a trace for providing the first Scan signal Scan1 or the fourth Scan signal Scan4 can be reduced.
Further, in the above-mentioned pixel circuit provided by the embodiment of the present invention, as shown in fig. 6 and fig. 7, the pixel circuit further includes a current-cut-off module 6 connected between the second pole of the driving transistor M0 and the anode of the light emitting diode oled, where the current-cut-off module 6 is configured to enable the second pole of the driving transistor M0 and the light emitting diode oled to be in an open circuit state under the control of the fifth Scan signal Scan5, so that when the light emitting diode oled needs to be in a dark state, the current-cut-off module 6 enables the driving transistor M0 and the light emitting diode oled to be in an open circuit state, thereby shunting all the leakage current of the driving transistor M0 from the current-shunt module.
Alternatively, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 6 and 7, the current interception module 6 includes a sixth transistor M6; wherein,
a gate of the sixth transistor M6 is for receiving the fifth Scan signal Scan5, a first pole of the sixth transistor M6 is connected to the second pole of the driving transistor M0, and a second pole of the sixth transistor M6 is connected to an anode of the light emitting diode oled.
The above is merely an example of the specific structure of the current-cut-off module in the pixel circuit, and in the implementation, the specific structure of the current-cut-off module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In a specific implementation, in order to simplify a manufacturing process flow of the pixel circuit, in the pixel circuit provided in the embodiment of the present invention, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor may all be P-type transistors or all may be N-type transistors, which is not limited herein.
In detail, of course, in the pixel circuit provided in the embodiment of the present invention, the fifth scan signal and the fourth scan signal may be the same signal, so that the circuit wiring may be simplified, but one of the fifth transistor and the sixth transistor is required to be a P-type transistor, and the other is required to be an N-type transistor.
The Transistor in the above embodiments of the present invention may be a Thin Film Transistor (TFT) or a Metal oxide semiconductor field effect Transistor (MOS), and is not limited herein. In a specific implementation, the first electrode of the transistors may be a source, and the second electrode may be a drain, or the first electrode may be a drain, and the second electrode may be a source.
The following describes the operation of the pixel circuit provided in the embodiment of the present invention by taking the pixel circuits shown in fig. 4 and fig. 6 as examples. For convenience of description, a connection point of the first capacitor C1, the second capacitor C2, and the second switching transistor M2 is referred to as a first node a, a gate of the driving transistor M0 is referred to as a second node B, a first pole of the driving transistor M0 is referred to as a third node C, and a high-level signal is denoted by 1 and a low-level signal is denoted by 0 in the following description.
The operation of the pixel circuit shown in fig. 4 is described by taking the structure of the pixel circuit as an example, wherein in the pixel circuit shown in fig. 4, all the transistors are P-type transistors, and each P-type transistor is turned off under the action of a high-level signal and turned on under the action of a low-level signal; the corresponding input timing diagram is shown in fig. 8. Specifically, four periods of T1, T2, T3, and T4 in the input timing chart shown in fig. 8 are selected.
In the first time period T1, Scan1 is 0, Scan2 is 1, Scan3 is 0, and Scan4 is 0.
The second transistor M2 is in an off state, and the first transistor M1, the third transistor M3, the fourth transistor M4, and the fifth transistor M5 are in an on state. The reference signal Vref is transmitted to the second node B through the turned-on third transistor M3, the potential of the second node B is Vref, and the driving transistor M0 is turned on; the voltage VDD of the first power voltage end VDD is transmitted to the first node a sequentially through the turned-on fourth transistor M4 and the turned-on first transistor M1, and the potentials of the third node C and the first node a are both VDD; meanwhile, the drain current of the driving transistor M0 is shunted to the second power voltage terminal VEE through the turned-on fifth transistor M5, and the led oled is in a dark state.
In the second time period T2, Scan1 is 0, Scan2 is 1, Scan3 is 1, and Scan4 is 0.
The second transistor M2 and the fourth transistor M4 are in an off state, and the first transistor M1, the third transistor M3 and the fifth transistor M5 are in an on state. The potential difference between the second node B and the third node C gradually approaches the threshold voltage V of the driving transistor M0thWhen the potential difference between the second node B and the third node C is equal to the threshold voltage VthAt this time, the driving transistor M0 is turned off. At this time, the potential of the second node B is still Vref, and the potentials of the third node C and the first node A are changed from Vdd to Vref-VthThe compensation of the threshold voltage is realized. When the driving transistor M0 is turned on, the drain current of the driving transistor M0 is shunted to the second power voltage terminal through the turned-on fifth transistor M5, so the led oled is always in a dark state at this stage.
In the third time period T3, Scan1 is 1, Scan2 is 0, Scan3 is 1, and Scan4 is 1.
The first transistor M1, the third transistor M3, the fourth transistor M4, and the fifth transistor M5 are in an off state, and the second transistor M2 is in an on state. The data signal Vdata is provided to the first node a through the turned-on second transistor M2, so that the potential of the first node a becomes Vdata, and the potential of the second node B becomes Vdata + V according to the principle of conservation of electric quantity of the capacitor due to the floating state of the first capacitor C1thThereby realizing data writing.
In the fourth time period T4, Scan1 is 1, Scan2 is 1, Scan3 is 0, and Scan4 is 1.
The first transistor M1, the second transistor M2, the third transistor M3, and the fifth transistor M5 are in an off state, and the fourth transistor M4 is in an on state. The voltage VDD of the first power voltage terminal VDD is transmitted to the third node C, which is VDD, through the turned-on fourth transistor M4, and the potential of the second node B is maintained at Vdata + V due to the first capacitor C1 and the second capacitor C2thThe driving transistor M0 is in saturation state, and the operating current I flowing through the driving transistor M0 and driving the light emitting diode oled to emit light is known from the current characteristic in saturation stateoledSatisfies the formula: i isoled＝K(Vgs–Vth)2＝K[(Vdata+Vth)-Vdd-Vth]2＝K(Vdata-Vdd)2Where K is a structural parameter, this number is relatively stable in the same structure and can be calculated as a constant.
It can be seen that the working current flowing through the light emitting diode is not influenced by the threshold voltage of the driving transistor, and is only related to the data signal and the first power voltage terminal, thereby thoroughly solving the problem of the driving transistor due to the processThreshold voltage shift caused by manufacturing process and long-time operation on working current I of light-emitting diodeoledThe influence of (2) improves the panel display non-uniformity.
In addition, in the first time period and the second time period, the fifth transistor is in a conducting state, and the conducting fifth transistor enables the drain electrode of the driving transistor to be shunted to the second power supply voltage end, so that the problem that the dark state of the light emitting diode is not dark can be solved.
The operation of the pixel circuit shown in fig. 6 is described as an example, and the corresponding input timing chart is shown in fig. 9. Specifically, four periods of T1, T2, T3, and T4 in the input timing chart shown in fig. 9 are selected.
In the first time period T1, Scan1 is 0, Scan2 is 1, Scan3 is 0, Scan4 is 0, and Scan5 is 1.
The second transistor M2 and the sixth transistor M6 are in an off state, and the first transistor M1, the third transistor M3, the fourth transistor M4 and the fifth transistor M5 are in an on state. The reference signal Vref is transmitted to the second node B through the turned-on third transistor M3, the potential of the second node B is Vref, and the driving transistor M0 is turned on; the voltage VDD of the first power voltage end VDD is transmitted to the first node a sequentially through the turned-on fourth transistor M4 and the turned-on first transistor M1, and the potentials of the third node C and the first node a are both VDD; meanwhile, since the sixth transistor M6 disconnects the driving transistor M0 from the led oled, the drain current of the driving transistor M0 is entirely shunted to the second power voltage terminal VEE through the turned-on fifth transistor M5, and the led oled is completely in a dark state.
In the second time period T2, Scan1 is 0, Scan2 is 1, Scan3 is 1, Scan4 is 0, and Scan5 is 1.
The second transistor M2, the fourth transistor M4, and the sixth transistor M6 are in an off state, and the first transistor M1, the third transistor M3, and the fifth transistor M5 are in an on state. The potential difference between the second node B and the third node C gradually approaches the threshold voltage V of the driving transistor M0thWhen it comes toThe potential difference between the two nodes B and the third node C is equal to the threshold voltage VthAt this time, the driving transistor M0 is turned off. At this time, the potential of the second node B is still Vref, and the potentials of the third node C and the first node A are changed from Vdd to Vref-VthThe compensation of the threshold voltage is realized. When the driving transistor M0 is turned on, since the sixth transistor M6 disconnects the driving transistor M0 from the led oled, the drain current of the driving transistor M0 is all shunted to the second power voltage terminal VEE through the turned-on fifth transistor M5, and therefore the led oled is always in a dark state at this stage.
In the third time period T3, Scan1 is 1, Scan2 is 0, Scan3 is 1, Scan4 is 1, and Scan5 is 0.
The first transistor M1, the third transistor M3, the fourth transistor M4, and the fifth transistor M5 are in an off state, and the second transistor M2 and the sixth transistor M6 are in an on state. The data signal Vdata is provided to the first node a through the turned-on second transistor M2, so that the potential of the first node a becomes Vdata, and the potential of the second node B becomes Vdata + V according to the principle of conservation of electric quantity of the capacitor due to the floating state of the first capacitor C1thThereby realizing data writing.
In the fourth time period T4, Scan1 is 1, Scan2 is 1, Scan3 is 0, Scan4 is 1, and Scan5 is 0.
The first transistor M1, the second transistor M2, the third transistor M3, and the fifth transistor M5 are in an off state, and the fourth transistor M4 and the sixth transistor M6 are in an on state. The voltage VDD of the first power voltage terminal VDD is transmitted to the third node C, which is VDD, through the turned-on fourth transistor M4, and the potential of the second node B is maintained at Vdata + V due to the first capacitor C1 and the second capacitor C2thThe driving transistor M0 is in saturation state, and the operating current I flowing through the driving transistor M0 and driving the light emitting diode oled to emit light is known from the current characteristic in saturation stateoledSatisfies the formula: i isoled＝K(Vgs–Vth)2＝K[(Vdata+Vth)-Vdd-Vth]2＝K(Vdata-Vdd)2Where K is a structural parameter, this number is relatively stable in the same structure and can be calculated as a constant.
It can be seen that the working current flowing through the light emitting diode is not influenced by the threshold voltage of the driving transistor, and is only related to the data signal and the first power voltage terminal, thereby thoroughly solving the problem that the threshold voltage drift of the driving transistor caused by the process and long-time operation causes the working current I of the light emitting diodeoledThe influence of (2) improves the panel display non-uniformity.
In addition, in the first time period and the second time period, the sixth transistor M6 disconnects the driving transistor M0 from the light emitting diode oled, the fifth transistor is in a conducting state, and the conducting fifth transistor enables the drain electrode of the driving transistor to shunt the second power voltage end, so that the problem that the dark state of the light emitting diode is not dark is solved.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of the pixel circuit, as shown in fig. 10, including:
s101, in a first time period, a reset module resets a grid electrode of a driving transistor under the control of a first scanning signal; the light-emitting control module enables the first power voltage end and the first electrode of the driving transistor to be in a conducting state under the control of the third scanning signal; the shunt module shunts the leakage current of the driving transistor to a shunt end under the control of a fourth scanning signal;
s102, in a second time period, the reset module resets the grid electrode of the driving transistor under the control of the first scanning signal; the threshold compensation module is used for performing threshold compensation on the driving transistor under the control of the first scanning signal; the shunt module shunts the leakage current of the driving transistor to a shunt end under the control of a fourth scanning signal;
s103, in a third time period, the data writing module provides a data signal to the pixel circuit under the control of the second scanning signal;
s104, in a fourth time period, the light-emitting control module enables the first power voltage end and the first electrode of the driving transistor to be in a conducting state under the control of the third scanning signal; the light emitting diode emits light.
According to the pixel circuit provided by the embodiment of the invention, the threshold compensation module can compensate the threshold of the driving transistor, so that the threshold voltage drift of the driving transistor can be compensated, the influence of the threshold voltage on the light emitting diode is avoided, and the uniformity of the brightness of a display picture is improved. In addition, in the first time period and the second time period, the shunting module shunts the leakage current of the driving transistor to the shunting end under the control of the fourth scanning signal, so that the problem that the dark state of the existing pixel circuit is not dark is solved.
Further, when the pixel circuit includes the cut-off module, in the driving method provided by the embodiment of the present invention, the method further includes:
the cut-off module makes the second pole of the driving transistor and the light emitting diode in an open circuit state under the control of the fifth scanning signal in the first time period and in the second time period. Therefore, the problem that the dark state of the existing pixel circuit is not dark can be thoroughly solved.
Based on the same inventive concept, an embodiment of the present invention further provides an organic light emitting display panel, including the pixel circuit provided in the embodiment of the present invention, where the organic light emitting display panel may be a display panel of a computer, a mobile phone, a television, a notebook, an all-in-one machine, and other essential components of the display panel are all understood by those skilled in the art, and are not described herein again, nor should be limitations to the present invention.
The pixel circuit, the driving method thereof and the organic light emitting display panel provided by the embodiment of the invention comprise a data writing module, a threshold compensation module, a light emitting control module, a reset module, a driving transistor, a light emitting diode and a shunt module; the threshold compensation module can compensate the threshold of the driving transistor, so that the threshold voltage drift of the driving transistor can be compensated, the influence of the threshold voltage on the light emitting diode is avoided, and the uniformity of the brightness of a display picture is improved. In addition, as the shunt module connected with the second pole of the driving transistor is also arranged, when the light emitting diode is required to be in a dark state, the leakage current of the driving transistor can be shunted to the shunt end under the control of the fourth scanning signal, so that the problem that the dark state of the existing pixel circuit is not dark is solved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A pixel circuit, comprising: the device comprises a data writing module, a threshold compensation module, a light emitting control module, a reset module, a driving transistor, a light emitting diode, a cut-off module and a shunt module; wherein,
the reset module is connected with the grid electrode of the driving transistor and is used for resetting the grid electrode of the driving transistor under the control of a first scanning signal; the threshold compensation module is respectively connected with the grid electrode of the driving transistor, the first pole of the driving transistor, the data writing module and the first power supply voltage end and is used for performing threshold compensation on the driving transistor under the control of the first scanning signal; the data writing module is used for providing data signals to the pixel circuit under the control of a second scanning signal; the light-emitting control module is respectively connected with the first pole of the driving transistor and the first power supply voltage end and is used for enabling the first power supply voltage end and the first pole of the driving transistor to be in a conducting state under the control of a third scanning signal; the shunt module is respectively connected with the second pole of the driving transistor and the shunt end and is used for shunting the leakage current of the driving transistor to the shunt end under the control of a fourth scanning signal; the light emitting diode is connected between a second power supply voltage end and the second pole of the driving transistor;
the cut-off module is connected between the second pole of the driving transistor and the anode of the light emitting diode, and the cut-off module is used for enabling the second pole of the driving transistor and the light emitting diode to be in an open circuit state under the control of a fifth scanning signal.
2. The pixel circuit according to claim 1, wherein the threshold compensation module comprises a first transistor, a first capacitor, and a second capacitor; wherein,
the first end of the first capacitor is connected with the grid electrode of the driving transistor, and the second end of the first capacitor is respectively connected with the first end of the second capacitor, the first pole of the first transistor and the data writing module; the second end of the second capacitor is connected with the first power supply voltage end; the second pole of the first transistor is connected with the first pole of the driving transistor, and the grid of the first transistor is used for receiving the first scanning signal.
3. The pixel circuit according to claim 1, wherein the data writing module includes a second transistor; wherein,
the gate of the second transistor is configured to receive the second scan signal, the first pole of the second transistor is configured to receive the data signal, and the second pole of the second transistor is connected to the threshold compensation module.
4. The pixel circuit of claim 1, wherein the reset module comprises a third transistor; wherein,
the gate of the third transistor is used for receiving the first scan signal, the first pole of the third transistor is used for receiving a reference signal, and the second pole of the third transistor is connected with the gate of the driving transistor.
5. The pixel circuit according to claim 1, wherein the light emission control module includes a fourth transistor; wherein,
the gate of the fourth transistor is configured to receive the third scan signal, the first pole of the fourth transistor is connected to the first power voltage terminal, and the second pole of the fourth transistor is connected to the first pole of the driving transistor.
6. The pixel circuit according to claim 1, wherein the shunting terminal is the same terminal as the second power supply voltage terminal.
7. The pixel circuit according to any of claims 1-6, wherein the shunting module comprises a fifth transistor; wherein,
the gate of the fifth transistor is configured to receive the fourth scan signal, the first pole of the fifth transistor is connected to the second pole of the driving transistor, and the second pole of the fifth transistor is connected to the shunting terminal.
8. The pixel circuit according to claim 7, wherein the first scan signal and the fourth scan signal are the same signal.
9. The pixel circuit according to claim 1, wherein the current cutoff module includes a sixth transistor; wherein,
the gate of the sixth transistor is configured to receive the fifth scanning signal, the first pole of the sixth transistor is connected to the second pole of the driving transistor, and the second pole of the sixth transistor is connected to the anode of the light emitting diode.
10. An organic light-emitting display panel comprising the pixel circuit according to any one of claims 1 to 9.
11. A method of driving a pixel circuit according to any one of claims 1 to 9, comprising:
in a first time period, the reset module resets the grid electrode of the driving transistor under the control of a first scanning signal; the light-emitting control module makes the first power voltage end and the first electrode of the driving transistor be in a conducting state under the control of a third scanning signal; the shunting module shunts the drain current of the driving transistor to the shunting end under the control of a fourth scanning signal;
in a second time period, the reset module resets the grid electrode of the driving transistor under the control of the first scanning signal; the threshold compensation module is used for performing threshold compensation on the driving transistor under the control of the first scanning signal; the shunting module shunts the drain current of the driving transistor to the shunting end under the control of a fourth scanning signal;
in a third time period, the data writing module provides a data signal to the pixel circuit under the control of a second scanning signal;
in a fourth time period, the light-emitting control module makes the first power voltage end and the first electrode of the driving transistor in a conducting state under the control of a third scanning signal; the light emitting diode emits light.
12. The driving method of claim 11, when a shut-off module is included in the pixel circuit, further comprising:
the cut-off module makes the second pole of the driving transistor and the light emitting diode in an open circuit state under the control of a fifth scanning signal in a first time period and in a second time period.
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