CN111833817A - Pixel driving circuit, driving method and display panel - Google Patents
Pixel driving circuit, driving method and display panel Download PDFInfo
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- CN111833817A CN111833817A CN201910322009.7A CN201910322009A CN111833817A CN 111833817 A CN111833817 A CN 111833817A CN 201910322009 A CN201910322009 A CN 201910322009A CN 111833817 A CN111833817 A CN 111833817A
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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
Abstract
The present disclosure provides a pixel driving circuit, a driving method and a display panel, wherein the pixel driving circuit is further provided with a voltage stabilizing unit, the voltage stabilizing unit is connected between an anode of a light emitting diode and a sixth transistor of the pixel driving circuit, and when the pixel driving circuit is in a light emitting stage, the voltage stabilizing unit can be used for judging whether an anode voltage output to the anode of the light emitting diode by the sixth transistor is greater than a preset threshold value and conducting when the anode voltage is greater than the preset threshold value, so as to provide sufficient and effective anode voltage for the light emitting diode.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a driving method, and a display panel.
Background
An 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 approximately 180 °, a wide temperature range, and capability of implementing flexible Display and large-area full-color Display, and is considered as a Display panel with the most potential development in the industry.
The pixel driving circuit keeps stable and effective work, which is a key point of the improvement of the performance of the display panel. In the prior art, in order to reduce the influence of the threshold voltage of the pixel driving circuit on the driving current, a pixel driving circuit structure of 7 transistors and 1 capacitor, that is, a pixel driving circuit of 7T1C, is adopted, so that the light emitting diode can be reset and compensated, and further, a stable driving current is provided for the light emitting diode.
However, since the operation characteristics of the respective transistors are deteriorated under different environments for a long time, the driving transistor therein has problems such as an increase in leakage current and a protrusion of parasitic effect, which may cause a problem of abnormal light emission of the light emitting diode.
Disclosure of Invention
In view of the above-mentioned problems, the present disclosure provides a pixel driving circuit, a driving method, and a display panel.
In one aspect, the present disclosure provides a pixel driving circuit, including: the LED driving circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, a first capacitor, a light emitting diode and a voltage stabilizing unit;
one end of the first transistor is connected with a video data signal, the other end of the first transistor is respectively connected with one end of the second transistor and one end of the third transistor, and the control end of the first transistor is connected with a scanning control signal of the current pixel row;
the other end of the second transistor is connected to the positive electrode of a power supply, and the control end of the second transistor is connected to a light-emitting control signal;
the other end of the third transistor is respectively connected with one end of a fourth transistor and one end of a sixth transistor, the control end of the third transistor is respectively connected with one end of a fifth transistor, one end of the first capacitor and one end of the fourth transistor, and the other end of the first capacitor is connected to the positive electrode of a power supply;
the control end of the fourth transistor is connected with a scanning control signal of the current pixel row;
the other end of the fifth transistor is connected with one end of the seventh transistor, and the control end of the fifth transistor is connected with a scanning control signal of a previous pixel row;
one end of the sixth transistor is connected with one end of the voltage stabilizing unit, and the control end of the sixth transistor is connected with a light-emitting control signal;
the other end of the seventh transistor is connected with the other end of the voltage stabilizing unit, and a control end of the seventh transistor is connected with a reset control signal;
the anode of the light-emitting diode is connected with the other end of the voltage stabilizing unit, and the cathode of the light-emitting diode is connected with the ground wire;
when the pixel driving circuit is in a light-emitting stage, the voltage stabilizing unit is used for judging whether the anode voltage of the light-emitting diode is greater than a preset threshold value, and when the anode voltage is greater than the preset threshold value, the voltage stabilizing unit is conducted to enable the light-emitting diode to emit light.
In still other examples of the invention, the voltage stabilizing unit includes an eighth transistor, a ninth transistor, a tenth transistor, and an eleventh transistor;
one end of the sixth transistor is connected with one end of the eighth transistor, one end of the ninth transistor and one end of the tenth transistor respectively; the other end of the eighth transistor is connected with the anode of the light-emitting diode; a control end of the eighth transistor is connected with a control end of the tenth transistor and one end of the eleventh transistor respectively;
the other end of the ninth transistor is connected with the control end of the ninth transistor, and is also connected with the other end of the tenth transistor and the control end of the eleventh transistor;
and the other end of the eleventh transistor is connected to a ground wire.
In other examples of this aspect, the voltage stabilization unit further includes: a second capacitor;
one end of the second capacitor is connected to a ground wire, and the other end of the second capacitor is connected to the anode of the light emitting diode and the other end of the eighth transistor respectively.
In an optional other example, the pixel driving circuit further comprises: a third capacitor;
one end of the third capacitor is connected to a connecting line between the first transistor and the second transistor, and the other end of the third capacitor is connected to a ground line.
In alternative other examples, the video data signal, the scan control signal, the light emission control signal, and the reset control signal are all generated by an external timing controller.
In other examples, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor 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.
In another aspect, the present disclosure provides a driving method of a pixel driving circuit, the driving method being applied to the pixel driving circuit of any one of the preceding claims, the driving method including:
in an initialization stage, the first transistor, the second transistor, the third transistor, the fourth transistor and the sixth transistor are disconnected, the fifth transistor and the seventh transistor are connected, the first capacitor is in a charging state, the light-emitting diode does not emit light, and the anode of the light-emitting diode is reset to be reset voltage;
in the threshold voltage compensation stage, the first transistor and the fourth transistor are switched on, the second transistor, the third transistor, the fifth transistor, the sixth transistor and the seventh transistor are switched off, and video data signals are written into the pixel driving circuit through the first transistor;
in a light emitting stage, the second transistor, the third transistor and the sixth transistor are turned on, and the first transistor, the fourth transistor, the fifth transistor and the seventh transistor are turned off; when the voltage input to one end of the voltage stabilizing unit through the sixth transistor is larger than a preset threshold value, the voltage stabilizing unit is conducted to output a stable high voltage to the light emitting diode, and the light emitting diode emits light.
In still other examples, the driving method further includes:
in a light emitting stage, under the drive that the second transistor and the sixth transistor are switched on, a drive current flows through a third transistor to drive the light emitting diode to emit light; wherein the drive current is independent of a threshold voltage of the third transistor.
In other examples, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type field effect transistors.
In a final aspect, the present disclosure provides a display panel comprising a pixel driving circuit as claimed in any one of the preceding claims.
The utility model provides a pixel drive circuit, drive method and display panel, still be provided with the voltage stabilization unit in the pixel drive circuit, this voltage stabilization unit is connected between the positive pole of emitting diode and the sixth transistor of pixel drive circuit, when the pixel drive circuit is in the luminescence phase, the voltage stabilization unit can be used to judge whether the positive pole voltage that the sixth transistor exported to the positive pole of emitting diode is greater than preset threshold value and switches on when this positive pole voltage is greater than preset threshold value to provide sufficient effectual positive pole voltage for emitting diode, thereby improve its luminous stability, reduce the risk of its device life loss.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate examples consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of a conventional pixel driving circuit;
fig. 2 is a schematic structural diagram of a pixel driving circuit provided in an example of the present disclosure;
fig. 3 is a schematic diagram of a driving timing sequence of a pixel driving circuit according to an example of the disclosure;
fig. 4 is a schematic structural diagram of another pixel driving circuit provided in the examples of the present disclosure;
fig. 5 is a schematic structural diagram of another pixel driving circuit provided in the examples of the present disclosure;
fig. 6 is a schematic structural diagram of another pixel driving circuit provided in the examples of the present disclosure.
Explicit examples of the present disclosure have been shown by the above figures and will be described in more detail later. These drawings and written description are not intended to limit the scope of the disclosed concepts in any manner, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific examples.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary examples do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Examples of the present disclosure may be described below with reference to the accompanying drawings. Accordingly, those of ordinary skill in the art will recognize that various changes, equivalents, and/or substitutions can be made to the examples described herein without departing from the scope and spirit of the present disclosure. In the description of the drawings, like components may be denoted by like reference numerals.
In the present disclosure, the expressions "having", "may have", "include" and "contain", or "may include" and "may contain" may be used herein to indicate the presence of corresponding features (e.g., elements such as values, functions, operations, or components), but do not exclude the presence of additional features.
In the present disclosure, the expression "a or B", "at least one of a and/or B", or "one or more of a and/or B", etc., as used herein, may include all combinations of one or more of the associated listed items. For example, the terms "a or B", "at least one of a and B", "at least one of a or B" may refer to all of the following: (1) comprises at least one A, (2) comprises at least one B, (3) comprises at least one A and at least one B.
The terminology used in the present disclosure is for the purpose of describing examples of the present disclosure, and is not intended to limit the scope of the present disclosure. Unless otherwise indicated, terms in the singular may include the plural. Unless otherwise defined herein, all terms (including technical or scientific terms) used herein may have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, which are defined or used commonly in dictionaries, should also be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined in the context of each example of the present disclosure. In some cases, even if a term is a term defined in the present disclosure, the term should not be construed as excluding examples of the present disclosure.
The pixel driving circuit keeps stable and effective work, which is a key point of the improvement of the performance of the display panel. In order to reduce the influence of the threshold voltage of the pixel driving circuit on the driving current, the pixel driving circuit structure of 7 transistors and 1 capacitor, namely the pixel driving circuit of 7T1C, is adopted, so that the light emitting diode can be reset and compensated, and further, the stable driving current is provided for the light emitting diode.
Fig. 1 is a schematic structural diagram of a conventional pixel driving circuit, and as shown in fig. 1, the pixel driving circuit includes transistors M1, M2, M3, M4, M5, M6, and M7, a capacitor C6, and a light emitting diode D1.
The control end of the transistor M1 is connected to the scan control signal of the previous pixel row, one end of the transistor is connected to the initial voltage signal, and the other end of the transistor is connected to one end of the capacitor C6, the control end of the transistor M2 and one end of the transistor M6 respectively;
one end of the transistor M2 is connected to one end of the transistor M4 and one end of the transistor M7, respectively, and the other end is connected to the other end of the transistor M6 and one end of the transistor M3, respectively;
the other end of the transistor M3 is respectively connected with one end of the transistor M5 and the anode of the light-emitting diode D1, and the control end is connected with a light-emitting control signal;
the control end of the transistor M4 is connected with a light-emitting control signal, and the other end of the transistor M4 is connected with the other end of the capacitor C6 and is connected with the positive electrode of a power supply;
the control end of the transistor M5 is connected with a reset control signal, and the other end of the transistor M5 is connected with an initial voltage signal;
the control end of the transistor M6 is connected with the scanning control signal of the current pixel row; the control terminal of the transistor M7 is connected to the scan control signal of the current pixel row, and the other terminal is connected to the video data signal.
Each of the transistors is a P-type transistor, i.e., the transistor is turned on when the control terminal is at a low level.
When the conventional pixel driving circuit is in the light-emitting stage, the reset control signal is at a high level, the scan control signal of the current pixel row is at a high level, the scan control signal of the previous pixel row is at a high level, the light-emitting control signal is at a low level, and the video data signal is at a low level.
At this time, the transistor M2, the transistor M3, and the transistor M4 are turned on to make the anode of the light emitting diode D1 at a high level and activate the light emitting diode to emit light. However, as previously mentioned, the operational performance of the transistor will be affected as its lifetime increases. In particular, as for the transistor M3, once the leakage current becomes large, the level of the leakage current transmitted to the anode of the light emitting diode D1 cannot reach the effective light emitting voltage of the light emitting diode D1, that is, the light emitting diode D1 emits light under the state of abnormal light emitting voltage, which also makes the light emitting diode D1 prone to light emitting abnormality and device lifetime loss.
In view of the above problems, the present disclosure provides a pixel driving circuit, a driving method, and a display panel, so as to provide sufficient and effective anode voltage for light emission of a light emitting diode by using a voltage stabilizing unit, improve light emission stability, and reduce a risk of lifetime loss of devices.
For convenience of description, without specific explanation, the transistors referred to in the examples provided in the present disclosure will be P-type field effect transistors, i.e., PMOS transistors, and thus, in the examples provided in the present disclosure, when the control terminal of the transistor is inputted with a low level, the transistor will be turned on, and vice versa.
It should be noted that, each crystal in the pixel driving circuit based on the present disclosure may also adopt an inverted fet thereof, and the signal level input to the pixel driving circuit should be adjusted accordingly, and the principle thereof is similar, and the details of the inverted fet of each transistor are not repeated in the present disclosure.
Fig. 2 is a schematic structural diagram of a pixel driving circuit according to an example of the present disclosure, and as shown in fig. 2, the pixel driving circuit includes:
a pixel driving circuit body 10 and a voltage stabilizing unit 20.
The pixel driving circuit body 10 includes: the light emitting diode comprises a first transistor P1, a second transistor P2, a third transistor P3, a fourth transistor P4, a fifth transistor P5, a sixth transistor P6, a seventh transistor P7, a first capacitor C2 and a light emitting diode D.
One end of the first transistor P1 is connected to the video DATA signal DATA, the other end is connected to one end of the second transistor P2 and one end of the third transistor P3, and the control end of the first transistor P1 is connected to the scan control signal GATE _ N of the current pixel row;
the other end of the second transistor P2 is connected to the power supply anode VDD, and the control end of the second transistor P2 is connected to the light-emitting control signal EM;
the other end of the third transistor P3 is connected to one end of the fourth transistor P4 and one end of the sixth transistor P6, respectively, the control end of the third transistor P3 is connected to one end of the fifth transistor P5, one end of the first capacitor C2 and one end of the fourth transistor P4, respectively, and the other end of the first capacitor C2 is connected to the power supply anode VDD;
the control terminal of the fourth transistor P4 is connected to the scan control signal GATE _ N of the current pixel row;
the other end of the fifth transistor P5 is connected to one end of the seventh transistor P7, and the control end of the fifth transistor P5 is connected to the scan control signal GATE _ N-1 of the previous pixel row;
one end of the sixth transistor P6 is connected to one end of the voltage stabilizing unit 20, and the control end of the sixth transistor P6 is connected to the emission control signal EM;
the other end of the seventh transistor P7 is connected to the other end of the voltage stabilizing unit 20, and the control end of the seventh transistor P7 is connected to the RESET control signal RESET;
the anode of the light emitting diode D is connected to the other end of the voltage stabilizing unit 20, and the cathode of the light emitting diode D is connected to the ground line VSS.
The pixel driving circuit is controlled to be in different stages by level variation of each signal, and the stages include, but are not limited to, an initialization stage, a threshold voltage compensation stage, and a light emitting stage.
Specifically, in the example of the present disclosure, when the pixel driving circuit is in the light emitting phase, the voltage stabilizing unit 20 is configured to determine whether the anode voltage of the light emitting diode D is greater than a preset threshold, and when the anode voltage is greater than the preset threshold, the voltage stabilizing unit 20 is turned on to make the light emitting diode D emit light.
Fig. 3 is a schematic diagram of a driving timing sequence of a pixel driving circuit according to an example of the present disclosure, as shown in fig. 3, when the pixel driving circuit according to the example of the present disclosure is in a light emitting phase, states of signals therein are as follows: the RESET control signal RESET is at a high level, the scan control signal GATE _ N of the current pixel row is at a high level, the scan control signal GATE _ N-1 of the previous pixel row is at a high level, the emission control signal EM is at a low level, and the video DATA signal DATA is at a low level.
Since the emission control signal EM is at a low level, the second transistor P2 and the sixth transistor P6 are turned on; the third transistor P3 may be regarded as a diode, which will be turned on gradually, by compensation of the threshold voltage due to the own structure of the 7T1C pixel driving circuit. The other first transistor P1, fourth transistor P4, fifth transistor P5, and seventh transistor P7 are all turned off. The anode voltage of the node a between the sixth transistor P6 and the voltage stabilizing unit 20 will gradually increase until the anode voltage of the node a is high enough, the voltage stabilizing unit 20 is turned on and supplies the anode voltage to the anode of the led D1, so that the led D1 is activated and emits light.
Further, in an alternative example, the aforementioned video DATA signal DATA, the scan control signal GATE _ N of the current pixel row, the scan control signal GATE _ N-1 of the current pixel row, the emission control signal EM, and the RESET control signal RESET are all generated by an external timing controller.
In addition, in an alternative example, the first transistor P1, the second transistor P2, the third transistor P3, the fourth transistor P4, the fifth transistor P5, the sixth transistor P6, and the seventh transistor P7 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.
In this example, by providing the voltage stabilizing unit to determine whether the anode voltage output from the sixth transistor to the anode of the light emitting diode is greater than a preset threshold and turning on when the anode voltage is greater than the preset threshold, a sufficiently high anode voltage can be supplied to the light emitting diode.
On the basis of the above example, in order to further describe the pixel driving circuit provided by the present disclosure, fig. 4 is a schematic structural diagram of another pixel driving circuit provided by the example of the present disclosure.
As shown in fig. 4, the pixel driving circuit includes a pixel driving circuit body 10 and a voltage stabilizing unit 20.
The specific structure of the pixel driving circuit body 10 is similar to the previous examples, and is not repeated here. Unlike the foregoing example, the voltage stabilization unit 20 in the present example specifically includes: an eighth transistor P8, a ninth transistor P9, a tenth transistor P10, and an eleventh transistor P11;
wherein, one end of the sixth transistor P6 is connected to one end of the eighth transistor P8, the ninth transistor P9 and the tenth transistor P10, respectively; the other end of the eighth transistor P8 is connected to the anode of the light emitting diode D; a control terminal of the eighth transistor P8 is connected to a control terminal of the tenth transistor P10 and one terminal of the eleventh transistor P11, respectively;
the other end of the ninth transistor P9 is connected to its own control terminal, and is also connected to the other end of the tenth transistor P10 and a control terminal of the eleventh transistor P11; the other end of the eleventh transistor P11 is connected to the ground line VSS.
Unlike the transistors described above, the eleventh transistor P11 in the present disclosure is an N-type field effect transistor, i.e., an N-MOS transistor.
In conjunction with the timing chart shown in fig. 3, in the pixel driving circuit provided in the present example, when it is in the light-emitting phase, the states of the respective signals therein are as follows: the RESET control signal RESET is at a high level, the scan control signal GATE _ N of the current pixel row is at a high level, the scan control signal GATE _ N-1 of the previous pixel row is at a high level, the emission control signal EM is at a low level, and the video DATA signal DATA is at a low level.
Since the emission control signal EM is at a low level, the second transistor P2 and the sixth transistor P6 are turned on; with the compensation of the threshold voltage by the own structure of the 7T1C pixel driving circuit, the third transistor P3 may be regarded as a diode which is turned on gradually, i.e., the voltage of the node a at the connection between the sixth transistor P6 and the eighth transistor P8 is raised gradually. Since the node a is also connected to the ninth transistor P9, since the control terminal of the ninth transistor P9 is connected to itself, which may be equivalent to a diode, the P9 turns on as the voltage at the node a gradually rises and reaches the threshold voltage of P9.
At this time, the control terminal of the eleventh transistor P11 receives the voltage of the node a to be turned on, and the control terminal of the tenth transistor P10 coincides with the voltage of the ground to be turned on. The conduction of the P11 and the P10 forms a ring-shaped path structure, so that the P8 is continuously conducted, and the voltage of the node C at the other end of the P8 is consistent with the voltage of the node A. This voltage is output as an anode voltage to the anode of the light emitting diode D to emit light.
The structure of the pixel drive circuit provided in this example achieves determination as to whether or not the voltage at the node a is larger than a preset threshold by utilizing the characteristic that the ninth transistor P9 can be equivalent to a diode, so that the P8 achieves conduction only in the case where the voltage at the node a is large enough to activate P9 to conduct. And the voltage of the node C is consistent with the voltage of the node A after the P8 is conducted, and the voltage can be used as anode voltage to be output to the light-emitting diode D, so that stable light emission is realized, and the problem of abnormal light emission is avoided.
On the basis of the example shown in fig. 4, in order to further stabilize the anode voltage provided by the node C, fig. 5 is a schematic structural diagram of another pixel driving circuit provided in the example of the present disclosure.
Unlike the example shown in fig. 4, in the pixel driving circuit provided in fig. 5, the voltage stabilizing unit 20 further includes: a second capacitance C3;
one end of the second capacitor C3 is connected to the ground line VSS, and the other end is connected to the anode of the light emitting diode D and the other end of the eighth transistor, respectively.
In other words, a second capacitor C3 is also connected to the node C, and the second node C3 can be used for storing energy when the voltage at the node C is high. Therefore, when the voltage at the node C fluctuates, the second node C3 can release its reserved voltage to avoid the device damage to the led D caused by the rapid decrease of the voltage at the node C.
On the basis of the above examples, fig. 6 is a schematic structural diagram of a further pixel driving circuit provided in the examples of the present disclosure.
As shown in fig. 6, similar to the pixel driving circuit shown in fig. 2, 4 and 5, the pixel driving circuit includes a pixel driving circuit body 10 and a voltage stabilizing unit 20, and further includes a third capacitor C1.
The structures of the pixel driving circuit body 10 and the voltage stabilizing unit 20 can be seen in any of the foregoing examples, and the effects and principles thereof are also similar to those of the foregoing examples, which are not repeated herein.
Unlike the previous example, the present example further includes a third capacitor C1, one end of the third capacitor is connected between the connection lines of the first transistor P1 and the second transistor P2, and the other end is connected to the ground line VSS.
In conjunction with the timing diagram shown in fig. 3, during the threshold voltage compensation phase, the RESET control signal RESET is at a high level, the scan control signal GATE _ N of the current pixel row is at a low level, the scan control signal GATE _ N-1 of the previous pixel row is at a high level, the emission control signal EM is at a high level, and the video DATA signal DATA is at a high level.
Therefore, at this stage, the first transistor P1 and the fourth transistor P4 will be in a turned-on state, and a high level of the video DATA signal input will be input into the pixel driving circuit through the turned-on P1, at which time the gate voltage of the third transistor P3 is a difference of the voltage Vdata of the DATA and the absolute value | Vth | of the threshold voltage thereof, i.e., Vdata- | Vth |, completing the compensation for P3.
At the same time, the third capacitor C1 will realize charging to store energy and keep the voltage of DATA stable and effective, so as to avoid the voltage fluctuation thereof from causing the failure of the threshold voltage compensation of P3.
The present disclosure also provides a driving method based on any one of the foregoing pixel driving circuits, including the steps of:
and step S101, controlling the pixel driving circuit to be in an initialization stage.
Specifically, in conjunction with the timing diagram shown in fig. 3, in the initialization phase, the RESET control signal RESET is at a low level, the scan control signal GATE _ N of the current pixel row is at a high level, the scan control signal GATE _ N-1 of the previous pixel row is at a low level, the emission control signal EM is at a high level, and the video DATA signal DATA is at a low level.
In the above signal state, the fifth transistor P5 and the seventh transistor P7 are turned on, and the first transistor P1, the second transistor P2, the third transistor P3, the fourth transistor P4, and the sixth transistor P6 are turned off. Meanwhile, the first capacitor C2 is in a charging state under the action of the positive power supply VDD, and the positive electrode of the light emitting diode D is reset to be at a reset voltage under the action of the reset control signal.
And S102, controlling the pixel driving circuit to be in a threshold voltage compensation stage.
Specifically, in the timing diagram shown in fig. 3, during the threshold voltage compensation phase, the RESET control signal RESET is at a low level, the scan control signal GATE _ N of the current pixel row is at a high level, the scan control signal GATE _ N-1 of the previous pixel row is at a low level, the emission control signal EM is at a high level, and the video DATA signal DATA is at a low level.
The first transistor P1 and the fourth transistor P4 will be turned on, the second transistor P2, the third transistor P3, the fifth transistor P5, the sixth transistor P6, and the seventh transistor P7 will be turned off, and the video DATA signal DATA is written to the pixel driving circuit through the first transistor P1. At this time, the potential of the anode of the light emitting diode D is reset to a low level.
In particular, in the threshold voltage compensation stage, the gate and the drain of the third transistor P3 are shorted through the turned-on fourth transistor P4 to form a diode structure; the video DATA signal DATA is written to the source of the third transistor P3 through the turned-on first transistor P1, and the gate of the third transistor P3 is charged by the diode structure of the third transistor P3.
At this time, the gate voltage Vg is represented as Vg ═ Vdata | Vth |.
Where Vg denotes a potential of the gate of the third transistor P3, Vdata denotes a potential of the video DATA signal DATA, and Vth denotes a threshold voltage of the third transistor P3, i.e., the driving transistor.
And step S103, controlling the pixel driving circuit to be in a light-emitting stage.
Specifically, in conjunction with the timing diagram shown in fig. 3, in the light-emitting phase, the RESET control signal RESET is at a high level, the scan control signal GATE _ N of the current pixel row is at a high level, the scan control signal GATE _ N-1 of the previous pixel row is at a high level, the light-emitting control signal EM is at a low level, and the video DATA signal DATA is at a low level.
In the light emitting stage, the second transistor P2, the third transistor P3, and the sixth transistor P6 are turned on, and the first transistor P1, the fourth transistor P4, the fifth transistor P5, and the seventh transistor P7 are turned off; when the voltage inputted to one end of the voltage stabilizing unit 20 through the sixth transistor P6 is greater than a preset threshold, the voltage stabilizing unit 20 is turned on to emit light to the light emitting diode D to output a stable high voltage, and the light emitting diode D emits light.
Specifically, in the light emitting stage, since the light emission control signal EM is at a low level, the second transistor P2 and the sixth transistor P6 are turned on; the third transistor P3 may be regarded as a diode, which will be turned on gradually, by compensation of the threshold voltage due to the own structure of the 7T1C pixel driving circuit. The other first transistor P1, fourth transistor P4, fifth transistor P5, and seventh transistor P7 are all turned off. The anode voltage of the node a between the sixth transistor P6 and the voltage stabilizing unit 20 will gradually increase until the anode voltage of the node a is high enough, the voltage stabilizing unit 20 is turned on and supplies the anode voltage to the anode of the led D1, so that the led D1 is activated and emits light.
In the light emitting stage, under the drive that the second transistor P2 and the sixth transistor P6 are turned on, a drive current flows through the third transistor P3 to drive the light emitting diode D to emit light; wherein the driving current is independent of a threshold voltage of the third transistor P3.
Specifically, since the second transistor P2 is turned on, the source of the third transistor P3 is at the positive power supply voltage VDD; the driving current flows to the light emitting diode D via the turned-on sixth transistor P6 and via the turned-on voltage stabilizing unit 20, and drives the light emitting diode D to emit light.
Wherein the source voltage Vs of the third transistor P3 is represented as Vs ═ VDDThe gate voltage Vg is expressed as Vg ═ VDATAVth i, where Vth is the threshold voltage of the third transistor P3, VDDVg represents the potential of the gate of the third transistor P3, Vdata represents the potential of the video DATA signal DATA, and Vth represents the threshold voltage of the third transistor P3, i.e., the driving transistor, for the power supply positive electrode voltage.
At this time, Vs-Vg-Vth | VDD-(VDATA-Vth | -DD-VDATA。
Therefore, the driving current Ids of the third transistor P3 is not affected by the variation of the threshold voltage Vth thereof, that is, the driving current of the light emitting diode D is not affected by the variation of the threshold voltage Vth.
It should be noted that the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type field effect transistors.
In other optional examples, the transistors may also be N-type field effect transistors, and signals input to the N-type field effect transistors need to be adjusted accordingly, which is not described herein again.
In a final aspect, the present disclosure provides a display panel comprising a pixel driving circuit as claimed in any one of the preceding claims.
Although exemplary embodiments of the present invention have been described herein, the present invention is not limited to the various preferred embodiments described herein, but includes any and all embodiments, modifications, omissions, combinations (e.g., of aspects across various embodiments), alterations, and/or substitutions having equivalent elements as would be appreciated by those in the art in light of the present disclosure. The limitations in the claims are to be interpreted broadly based on the terms used in the claims and not limited to examples described in the specification or during the prosecution of the application, which examples are to be construed as non-exclusive. For example, in the present disclosure, the term "preferably" is non-exclusive and means "preferably, but not limited to". In the present disclosure and during the course of this application, means-plus-function or step-plus-function limitations will apply only to the following cases, for a particular claim limitation, in which all of the following conditions exist: a) the "means for.. or" step for.. is expressly stated; b) the corresponding functions are clearly stated; and c) no structure, material, or acts for supporting the structure are recited. In the present disclosure and during the course of the present application, the term "invention" or "invention" may be used to denote one or more aspects of the present disclosure. The terms present invention or invention should not be improperly interpreted as a limitation, should not be improperly interpreted as applying all aspects or embodiments (i.e., it should be understood that the present invention has multiple aspects and embodiments), and should not be improperly interpreted as limiting the scope of the application or claims. In the present disclosure and during the course of the present application, the term "embodiment" may be used to describe any aspect, feature, process or step, any combination thereof and/or any portion thereof, etc. In some examples, various embodiments may include overlapping features. In the present disclosure and during the course of the present application, the following shorthand terms may be utilized: an "e.g." indicating "for example" and an "NB" indicating "attention".
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A pixel driving circuit, comprising: the LED driving circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, a first capacitor, a light emitting diode and a voltage stabilizing unit;
one end of the first transistor is connected with a video data signal, the other end of the first transistor is respectively connected with one end of the second transistor and one end of the third transistor, and the control end of the first transistor is connected with a scanning control signal of the current pixel row;
the other end of the second transistor is connected to the positive electrode of a power supply, and the control end of the second transistor is connected to a light-emitting control signal;
the other end of the third transistor is respectively connected with one end of a fourth transistor and one end of a sixth transistor, the control end of the third transistor is respectively connected with one end of a fifth transistor, one end of the first capacitor and one end of the fourth transistor, and the other end of the first capacitor is connected to the positive electrode of a power supply;
the control end of the fourth transistor is connected with a scanning control signal of the current pixel row;
the other end of the fifth transistor is connected with one end of the seventh transistor, and the control end of the fifth transistor is connected with a scanning control signal of a previous pixel row;
one end of the sixth transistor is connected with one end of the voltage stabilizing unit, and the control end of the sixth transistor is connected with a light-emitting control signal;
the other end of the seventh transistor is connected with the other end of the voltage stabilizing unit, and a control end of the seventh transistor is connected with a reset control signal;
the anode of the light-emitting diode is connected with the other end of the voltage stabilizing unit, and the cathode of the light-emitting diode is connected with the ground wire;
when the pixel driving circuit is in a light-emitting stage, the voltage stabilizing unit is used for judging whether the anode voltage of the light-emitting diode is greater than a preset threshold value, and when the anode voltage is greater than the preset threshold value, the voltage stabilizing unit is conducted to enable the light-emitting diode to emit light.
2. The pixel driving circuit according to claim 1, wherein the voltage stabilizing unit includes an eighth transistor, a ninth transistor, a tenth transistor, and an eleventh transistor;
one end of the sixth transistor is connected with one end of the eighth transistor, one end of the ninth transistor and one end of the tenth transistor respectively; the other end of the eighth transistor is connected with the anode of the light-emitting diode; a control end of the eighth transistor is connected with a control end of the tenth transistor and one end of the eleventh transistor respectively;
the other end of the ninth transistor is connected with the control end of the ninth transistor, and is also connected with the other end of the tenth transistor and the control end of the eleventh transistor;
and the other end of the eleventh transistor is connected to a ground wire.
3. The pixel driving circuit according to claim 2, wherein the voltage stabilizing unit further comprises: a second capacitor;
one end of the second capacitor is connected to a ground wire, and the other end of the second capacitor is connected to the anode of the light emitting diode and the other end of the eighth transistor respectively.
4. The pixel driving circuit according to claim 1, further comprising: a third capacitor;
one end of the third capacitor is connected to a connecting line between the first transistor and the second transistor, and the other end of the third capacitor is connected to a ground line.
5. The pixel driving circuit according to any of claims 1-4, wherein the video data signal, the scan control signal, the emission control signal, and the reset control signal are all generated by an external timing controller.
6. The pixel driving circuit according to any one of claims 1 to 4, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor 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.
7. A driving method of a pixel driving circuit, the driving method being applied to the pixel driving circuit according to any one of claims 1 to 6, the driving method comprising:
in an initialization stage, the first transistor, the second transistor, the third transistor, the fourth transistor and the sixth transistor are disconnected, the fifth transistor and the seventh transistor are connected, the first capacitor is in a charging state, the light-emitting diode does not emit light, and the anode of the light-emitting diode is reset to be reset voltage;
in the threshold voltage compensation stage, the first transistor and the fourth transistor are switched on, the second transistor, the third transistor, the fifth transistor, the sixth transistor and the seventh transistor are switched off, and video data signals are written into the pixel driving circuit through the first transistor;
in a light emitting stage, the second transistor, the third transistor and the sixth transistor are turned on, and the first transistor, the fourth transistor, the fifth transistor and the seventh transistor are turned off; when the voltage input to one end of the voltage stabilizing unit through the sixth transistor is larger than a preset threshold value, the voltage stabilizing unit is conducted to output a stable high voltage to the light emitting diode, and the light emitting diode emits light.
8. The driving method of the pixel driving circuit according to claim 7, further comprising:
in a light emitting stage, under the drive that the second transistor and the sixth transistor are switched on, a drive current flows through a third transistor to drive the light emitting diode to emit light; wherein the drive current is independent of a threshold voltage of the third transistor.
9. The method for driving the pixel driving circuit according to claim 7 or 8, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type field effect transistors.
10. A display panel comprising the pixel drive circuit according to any one of claims 1 to 6.
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