CN111986620A - Pixel driving circuit, driving method thereof, display panel and display device - Google Patents
Pixel driving circuit, driving method thereof, display panel and display device Download PDFInfo
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- CN111986620A CN111986620A CN202010949626.2A CN202010949626A CN111986620A CN 111986620 A CN111986620 A CN 111986620A CN 202010949626 A CN202010949626 A CN 202010949626A CN 111986620 A CN111986620 A CN 111986620A
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- 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]
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Abstract
The embodiment of the invention provides a pixel driving circuit and a driving method thereof, a display panel and a display device, and relates to the technical field of display. The pixel driving circuit includes: the anode reset module is respectively electrically connected with the first scanning signal line, the reset signal line and the anode of the organic light-emitting diode and is used for resetting the anode of the organic light-emitting diode by utilizing the reset signal under the control of the first scanning signal; and the pull-down module is electrically connected with the pull-down signal line and the anode of the organic light-emitting diode respectively and is used for pulling down the potential of the anode of the organic light-emitting diode by using the pull-down signal. The embodiment of the invention is used for improving the problems of the stealing brightness of the sub-pixels and the rising of the dark-state voltage.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof, a display panel and a display device.
[ background of the invention ]
Display technology plays an important role in the development of information technology as an important component of the information industry. With the development of display technology, display panels of liquid crystal display panels, organic light emitting diode display panels, and the like are widely used.
The organic light emitting diode display panel is a display panel which utilizes light emission of an organic light emitting diode to realize display, and at present, the organic light emitting diode display panel mainly has the following two problems that firstly, when the display panel displays a picture, a sub-pixel is stolen and bright, so that the display performance is adversely affected, and secondly, the dark state voltage is increased and exceeds the output capacity of a driving chip, so that the driving chip cannot support. Therefore, how to improve the brightness stealing and the dark state voltage rising of the sub-pixels becomes a technical problem to be solved urgently at present.
[ summary of the invention ]
Embodiments of the present invention provide a pixel driving circuit, a driving method thereof, a display panel, and a display device, so as to solve the problem of the sneak brightness of sub-pixels and the problem of the increase of dark-state voltage.
In one aspect, an embodiment of the present invention provides a pixel driving circuit, including:
the anode reset module is respectively electrically connected with the first scanning signal line, the reset signal line and the anode of the organic light-emitting diode and is used for resetting the anode of the organic light-emitting diode by utilizing the reset signal under the control of the first scanning signal;
and the pull-down module is respectively electrically connected with the pull-down signal line and the anode of the organic light-emitting diode and is used for pulling down the potential of the anode of the organic light-emitting diode by using the pull-down signal.
On the other hand, an embodiment of the present invention provides a driving method for a pixel driving circuit, where the driving method is used to drive the pixel driving circuit, and includes:
the anode reset module resets the anode of the organic light emitting diode by utilizing a reset signal under the control of a first scanning signal;
and the pull-down module utilizes the pull-down signal to pull down the potential of the anode of the organic light-emitting diode.
In another aspect, an embodiment of the present invention provides a display panel, including:
and the sub-pixels comprise the pixel driving circuit and organic light emitting diodes electrically connected with the pixel driving circuit.
In another aspect, an embodiment of the present invention provides a display device, including the display panel described above.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, a pull-down module is additionally arranged, and the anode potential of the organic light-emitting diode is further pulled down by using a pull-down signal at the pull-down moment, so that the anode potential of the organic light-emitting diode is pulled to a lower potential from the reset potential. Therefore, the voltage difference between the potential after the anode is pulled down and the corresponding lighting potential of the organic light-emitting diode is increased, so that the anode can contain more charges leaked from the anodes of other organic light-emitting diodes, the risk of light emission of the organic light-emitting diodes under the action of leakage current is reduced, and the phenomenon of stealing lighting of sub-pixels is effectively improved.
Moreover, when the display panel displays a full black picture, because the basic potential of the anode of the organic light emitting diode is pulled low, the anode of the organic light emitting diode can reach the standard potential corresponding to the 0 gray scale only by receiving a larger driving current, and because the driving current is inversely proportional to the data voltage, the driving chip can realize full black display only by providing a smaller dark state voltage without increasing the dark state voltage, thereby avoiding the dark state voltage from exceeding the output capacity of the driving chip.
Therefore, by adopting the technical scheme provided by the embodiment of the invention, the anode potential of the organic light-emitting diode is further pulled down by additionally arranging the pull-down module, so that the phenomenon of stealing and lighting of sub-pixels can be effectively improved, the display performance of the display panel is optimized, and the increase of dark-state voltage can be avoided, thereby avoiding the problem that a driving chip cannot support the display, and effectively ensuring the normal display of low-gray-scale pictures.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the invention;
FIG. 2 is a signal timing diagram corresponding to the pixel driving circuit shown in FIG. 1;
fig. 3 is another schematic structural diagram of a pixel driving circuit according to an embodiment of the invention;
FIG. 4 is a timing diagram of signals corresponding to the pixel driving circuit shown in FIG. 3;
fig. 5 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the invention;
FIG. 6 is a timing diagram of signals corresponding to the pixel driving circuit shown in FIG. 5;
FIG. 7 is a flowchart of a driving method according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Before describing the technical scheme provided by the embodiment of the invention, the invention firstly specifically describes the problems existing in the prior art:
the organic light emitting diode display panel comprises a plurality of sub-pixels, each sub-pixel comprises a pixel driving circuit and an organic light emitting diode which are electrically connected, wherein the organic light emitting diode is an organic electroluminescent device, under the action of an electric field, holes generated by an anode of the organic light emitting diode and electrons generated by a cathode of the organic light emitting diode are respectively injected into a hole transport layer and an electron transport layer and then migrate to an organic light emitting material layer, energy excitons are generated in the organic light emitting material layer, and visible light is generated.
In order to realize color display, the display panel includes sub-pixels of multiple colors, such as a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel, and organic light emitting materials of organic light emitting diodes in the sub-pixels of different colors are different, which results in different lighting voltages of the organic light emitting diodes of the sub-pixels of different colors based on different material characteristics. For example, the lighting voltage corresponding to the organic light emitting diode in the first color sub-pixel is lower than the lighting voltage corresponding to the organic light emitting diode in the second color sub-pixel and the organic light emitting diode in the third color sub-pixel, so when the display panel displays the second color picture or the third color picture, the anode charge of the organic light emitting diode in the second color sub-pixel or the third color sub-pixel leaks to the anode of the organic light emitting diode in the first color sub-pixel, which causes the anode voltage of the organic light emitting diode in the first color sub-pixel to be increased to the lighting voltage, so that the first color sub-pixel which should not emit light emits light, and the sub-pixel stealing lighting phenomenon occurs, which affects the display performance of the display panel.
In addition, as the resolution and refresh frequency of the display panel are increased, the scanning time of each row of sub-pixels is shortened, which results in the charging time of the sub-pixels being shortened, and thus, when the display panel performs low gray scale image display, the data signals are not fully charged within the short charging time. For example, to realize the display of a full black picture, the driving chip provides a theoretical dark state voltage V1 corresponding to 0 gray scale to the data line, and after the charging is finished, because the charging is not complete, the sub-pixel may be charged to only V2 lower than V1, so that the driving current converted by V2 is greater than the driving current corresponding to V1, and the sub-pixel still emits light weakly, thereby the display panel cannot display the full black picture. At this time, if it is desired to ensure that the sub-pixels do not emit light when the display panel displays a full black image, the dark state voltage provided by the driving chip can only be increased to V3 which is greater than V1, so that the sub-pixels can be ensured to be charged to V1 under the condition of incomplete charging, and the increase of the dark state voltage exceeds the output capability of the driving chip, which results in the problem that the driving chip cannot support the sub-pixels.
In order to solve the above problem, an embodiment of the present invention provides a pixel driving circuit, as shown in fig. 1, fig. 1 is a schematic structural diagram of the pixel driving circuit provided in the embodiment of the present invention, where the pixel driving circuit includes an anode reset module 1 and a pull-down module 2, where the anode reset module 1 is electrically connected to a first scan signal line S1, a reset signal line Vref, and an anode of an organic light emitting diode D, respectively, and is configured to reset the anode of the organic light emitting diode D by using a reset signal provided by the reset signal line Vref under the control of the first scan signal provided by the first scan signal line S1, so as to prevent the anode of the organic light emitting diode D from remaining signals of a previous frame, and ensure accuracy of light emission of the organic light emitting diode D; the pull-down module 2 is electrically connected to the pull-down signal line SC and the anode of the organic light emitting diode D, respectively, and is configured to pull down the potential of the anode of the organic light emitting diode D by using a pull-down signal provided by the pull-down signal line SC.
It can be understood that, when the organic light emitting diode D emits light, the potential of the anode of the organic light emitting diode D needs to be greater than the corresponding lighting potential of the organic light emitting diode D, so that a sufficient voltage difference is formed between the anode and the cathode of the organic light emitting diode D to drive the organic light emitting diode D to emit light. In the embodiment of the invention, by adding a pull-down module 2, as shown in fig. 2, fig. 2 is a signal timing diagram corresponding to the pixel driving circuit shown in fig. 1, and at a pull-down time t, the anode potential of the organic light emitting diode D is further pulled down by using a pull-down signal, so that the organic light emitting diode D emits lightAnode potential V of polar tube DOLEDPulled to a lower potential Vpd by the reset potential Vref.
Therefore, the voltage difference between the potential after the anode is pulled down and the lighting potential corresponding to the organic light emitting diode D is increased, so that the anode can accommodate more charges leaked from the anodes of other organic light emitting diodes D, and the risk of light emission of the organic light emitting diodes D under the action of leakage current is reduced. Taking the display panel including the first color sub-pixel, the second color sub-pixel and the third color sub-pixel as an example, the lighting voltage of the organic light emitting diode D in the first color sub-pixel is lower than the lighting voltage corresponding to the organic light emitting diode D in the second color sub-pixel and the third color sub-pixel, so when the display panel displays the second color picture or the third color picture, when the anode charge of the organic light emitting diode D in the second color sub-pixel or the third color sub-pixel leaks to the anode of the organic light emitting diode D in the first color sub-pixel, in the prior art, the base potential of the anode of the organic light emitting diode D in the first color sub-pixel after being reset is higher, and only a small part of the leakage charge is accommodated, which causes the organic light emitting diode D to emit light, whereas in the present embodiment, the anode potential of the organic light emitting diode D in the first color sub-pixel is pulled lower, the basic potential of the anode is lower, so that the capacity of the anode for accommodating charges is enhanced, and the anode of the organic light emitting diode D in the first color sub-pixel can not reach the lighting potential after accommodating the leakage charges, so that the organic light emitting diode D in the first color sub-pixel can not emit light, and the phenomenon of stealing lighting of the sub-pixel is effectively improved.
When the display panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the first color may be red or green.
When the display panel displays a full black image, the driving current converted by the dark state voltage (data voltage corresponding to 0 gray scale) flows into the organic light emitting diode D, and the potential of the anode of the organic light emitting diode D is increased from the basic potential to the standard potential corresponding to 0 gray scale, so as to ensure that the organic light emitting diode D does not emit light. In the embodiment of the invention, the basic potential of the anode of the organic light emitting diode D is pulled down, so that the anode of the organic light emitting diode D can reach the standard potential corresponding to the 0 gray scale only by receiving larger driving current, and the driving current is in inverse proportion to the data voltage, so that the driving chip can realize full black display only by providing a smaller dark-state voltage without increasing the dark-state voltage, thereby avoiding the dark-state voltage from exceeding the output capability of the driving chip.
Therefore, by adopting the pixel driving circuit provided by the embodiment of the invention, the anode potential of the organic light emitting diode D is further pulled down by using the pull-down module 2, so that the phenomenon of stealing and lighting of sub-pixels can be effectively improved, the display performance of a display panel is optimized, and the increase of dark-state voltage can be avoided, thereby avoiding the problem that a driving chip cannot support the driving chip and ensuring the normal display of low-gray-scale pictures.
Optionally, referring to fig. 1 again, the pull-down module 2 may specifically include a pull-down capacitor C; the first polar plate of the pull-down capacitor C is electrically connected with the pull-down signal line SC, and the second polar plate of the pull-down capacitor C is electrically connected with the anode of the organic light-emitting diode D.
The pull-down capacitor C is electrically connected with the anode of the organic light-emitting diode D, the pull-down signal jumps from a high level to a low level, the potential of the first polar plate of the pull-down capacitor C is pulled down, and based on the characteristic that the capacitor has the constant pressure difference between two ends, the potential of the second polar plate of the pull-down capacitor C is correspondingly pulled down, so that the potential of the anode of the organic light-emitting diode D is pulled down.
Moreover, the pull-down module 2 is set as the pull-down capacitor C, so that the parasitic capacitance at the node where the anode of the organic light emitting diode D is located can be increased, and as can be seen from the formula C-Q/U, when the anode of the organic light emitting diode D receives the same charge amount, compared with the prior art, in the embodiment of the present invention, the potential change of the node where the anode of the organic light emitting diode D is located is smaller, and the influence of the leakage current charge on the anode potential is reduced to a greater extent, so that the problems of the sub-pixel brightness stealing phenomenon and the dark-state voltage rising are improved more effectively.
In addition, in the embodiment of the present invention, the pull-down degree of the anode potential of the organic light emitting diode D may be adjusted by adjusting the capacitance of the pull-down capacitor C and the voltage difference between the high level and the low level of the pull-down signal. In addition, in the embodiment of the present invention, the pull-down signal line SC may be a signal line that is independently arranged and is not multiplexed with other signal lines in the pixel driving circuit, so that the pull-down signal does not need to be multiplexed into other signals, and the voltage difference between the high level and the low level of the pull-down signal may be adjusted to a greater extent, so as to pull down the anode potential of the organic light emitting diode D to a greater extent, thereby achieving a greater regulation and control amplitude of the anode potential.
Further, referring to fig. 2 again, for the sake of easy understanding, the signals shown in fig. 2 are labeled as the labels of their corresponding signal lines, the first scan signal has a first transition edge TE1 and a second transition edge TE2, wherein the first transition edge TE1 transitions from the disable level to the enable level, the second transition edge TE2 transitions from the enable level to the disable level, and the first transition edge TE1 is located before the second transition edge TE 2. Illustratively, taking the enable level as a low level and the disable level as a high level as an example, the first transition edge TE1 is a falling edge and the second transition edge TE2 is a rising edge, when the first scan signal transitions from a high level to a low level, the anode reset module 1 resets the anode of the organic light emitting diode D by using the reset signal under the control of the low level, and when the first scan signal transitions from a low level to a high level, the anode reset module 1 stops resetting the anode of the organic light emitting diode D under the control of the high level.
Optionally, the pull-down signal has a rising edge and a falling edge, and the falling edge of the pull-down signal is located after the second transition edge TE2, that is, the pull-down signal maintains a stable high level in the reset period, and then jumps down after the anode reset is finished, so that the influence of the potential change of the pull-down signal on the normal reset of the anode is avoided, and meanwhile, the reliability of the reset and the potential pull-down is ensured.
Optionally, the pull-down signal has a rising edge and a falling edge, and the rising edge of the pull-down signal is located before the first transition edge TE1, that is, the pull-down signal jumps before the anode reset starts, so that a stable high level is maintained in the reset period, the influence of the potential change of the pull-down signal on the normal reset of the anode is avoided, and the reliability of the anode reset is improved.
Optionally, as shown in fig. 3, fig. 3 is another schematic structural diagram of the pixel driving circuit according to the embodiment of the present invention, and the pull-down module 2 may further include a pull-down transistor PD _ T; the control electrode of the pull-down transistor PD _ T is electrically connected with the pull-down control signal line PD _ L, the first electrode of the pull-down transistor PD _ T is electrically connected with the pull-down signal line SC, and the second electrode of the pull-down transistor PD _ T is electrically connected with the anode of the organic light emitting diode D.
By electrically connecting a pull-down transistor PD _ T to the anode of the organic light emitting diode D, when the potential of the anode is pulled down, the pull-down control signal line PD _ L provides a conduction level, the pull-down transistor PD _ T is turned on under the control of the conduction level, and the low level provided by the pull-down signal line SC is transmitted to the anode of the organic light emitting diode D, so as to further pull down the potential of the anode.
Compared with the arrangement mode of directly pulling down the reset signal received by the transistor in the anode reset module 1, by adopting the arrangement mode, the transistor in the anode reset module 1 and the pull-down transistor PD _ T of the pull-down module 2 are of two independent structures and are used for respectively realizing the reset function and the pull-down function, even if a certain transistor fails, for example, when the transistor in the anode reset module 1 fails, a pull-down potential can be provided for the anode of the organic light emitting diode D by using the pull-down transistor PD _ T, the pull-down potential can simultaneously realize the reset function, the signal of the previous frame remained on the anode of the organic light emitting diode D is avoided, and the light emitting accuracy of the organic light emitting diode D is ensured.
Further, as shown in fig. 4, fig. 4 is a signal timing diagram corresponding to the pixel driving circuit shown in fig. 3, for convenience of understanding, each signal shown in fig. 4 is labeled as a signal line corresponding to the signal line, the first scan signal has a first transition edge TE1 and a second transition edge TE2, wherein the first transition edge TE1 transitions from the disable level to the enable level, the second transition edge TE2 transitions from the enable level to the disable level, and the first transition edge TE1 is located before the second transition edge TE 2. Illustratively, taking the enable level as a low level and the disable level as a high level as an example, the first transition edge TE1 is a falling edge and the second transition edge TE2 is a rising edge, when the first scan signal transitions from a high level to a low level, the anode reset module 1 resets the anode of the organic light emitting diode D by using the reset signal under the control of the low level, and when the first scan signal transitions from a low level to a high level, the anode reset module 1 stops resetting the anode of the organic light emitting diode D under the control of the high level.
Alternatively, the pull-down control signal has a conduction level and a non-conduction level, and specifically, when the pull-down transistor PD _ T is a P-type transistor, the conduction level is a low level and the non-conduction level is a high level, and when the pull-down transistor PD _ T is an N-type transistor, the conduction level is a high level and the non-conduction level is a high level. And the moment when the non-conducting level jumps to the conducting level is located behind the second jumping edge TE2, the pull-down signal has a pull-down potential, the pull-down potential is smaller than the potential of the reset signal, at this time, the pull-down transistor PD _ T is turned on again after the anode reset is finished, the influence of the pull-down signal transmitted by the pull-down transistor PD _ T on the normal reset of the anode is avoided, and the reliability of reset and potential pull-down is ensured.
Optionally, referring to fig. 1 and 3 again, the anode reset module 1 may specifically include a first transistor T1, a gate of the first transistor T1 is electrically connected to the first scan signal line S1, a first pole of the first transistor T1 is electrically connected to the reset signal line Vref, and a second pole of the first transistor T1 is electrically connected to the anode of the organic light emitting diode D.
In addition, the pixel driving circuit provided by the embodiment of the invention further includes a driving transistor T0, a first node reset module 3, a charging module 4, and a light emitting control module 5.
The gate of the driving transistor T0 is electrically connected to the first node N1, the first pole of the driving transistor T0 is electrically connected to the second node N2, and the second pole of the driving transistor T0 is electrically connected to the third node N3.
The first node reset module 3 is electrically connected to the second scan signal line S2, the reset signal line Vref, and the first node N1, respectively, and is configured to reset the first node N1 by a reset signal provided by the reset signal line Vref under the control of the second scan signal provided by the second scan signal line S2. Specifically, the first node reset module 3 may specifically include a second transistor T2, a gate of the second transistor T2 being electrically connected to the second scan signal line S2, a first pole of the second transistor T2 being electrically connected to the reset signal line Vref, and a second pole of the second transistor T2 being electrically connected to the first node N1.
The charging module 4 is electrically connected to the third scan signal line S3, the Data line Data, the second node N2, the third node N3 and the first node N1, and is configured to write the Data signal provided by the Data line Data into the driving transistor T0 and compensate the threshold voltage of the driving transistor T0 under the control of the third scan signal provided by the third scan signal line S3. Specifically, the charging module 4 may specifically include a third transistor T3 and a fourth transistor T4, wherein a gate of the third transistor T3 is electrically connected to the third scan signal line S3, a first pole of the third transistor T3 is electrically connected to the Data line Data, a second pole of the third transistor T3 is electrically connected to the second node N2, a gate of the fourth transistor T4 is electrically connected to the third scan signal line S3, a first pole of the fourth transistor T4 is electrically connected to the third node N3, and a second pole of the fourth transistor T4 is electrically connected to the first node N1.
The light emission control module 5 is electrically connected to the light emission control signal line Emit, the power signal line PVDD, the second node N2, the third node N3, and the anode of the organic light emitting diode D, respectively, and is configured to supply a driving current converted from a power signal supplied via a data signal and the power signal line PVDD to the anode of the organic light emitting diode D under the control of the light emission control signal supplied from the light emission control signal line Emit. Specifically, the light emission control means may include a fifth transistor T5 and a sixth transistor T6, wherein a gate of the fifth transistor T5 is electrically connected to the light emission control signal line Emit, a first pole of the fifth transistor T5 is electrically connected to the power signal line PVDD, a second pole of the fifth transistor T5 is electrically connected to the second node N2, a gate of the sixth transistor T6 is electrically connected to the light emission control signal line Emit, and a first pole of the sixth transistor T6 and the third node N3 are electrically connected to a second pole of the sixth transistor T6 and an anode of the organic light emitting diode D.
In the embodiment of the present invention, fig. 1 and 4 are schematically illustrated by multiplexing the first scan signal line S1 and the third scan signal line S3, in which the first scan signal line S1 and the second scan signal line S2 are multiplexed, or the first scan signal line S1 and the third scan signal line S3 are multiplexed.
In addition, the pixel driving circuit provided by the embodiment of the invention may further include a storage capacitor Cst for maintaining the stability of the potential of the first node N1.
Taking the pull-down module 2 including the pull-down capacitor C, the first scanning signal line S1 and the third scanning signal line S3 for multiplexing, and the transistors included in the pixel driving circuit are all P-type transistors as an example, please refer to fig. 2 again to explain the working principle of the pixel driving circuit provided in the embodiment of the present invention:
in the first period T1, the second scan signal line S2 supplies a low level, the first scan signal line S1 (the third scan signal line S3) and the emission control signal line Emit supply a high level, and the reference signal supplied from the reference signal line is transmitted to the first node N1 via the turned-on second transistor T2 to reset the first node N1.
In the second period T2, the first scan signal line S1 (the third scan signal line S3) supplies a low level, the second scan signal line S2 and the emission control signal line Emit supplies a high level, the reference signal supplied from the reference signal line is transmitted to the anode of the organic light emitting diode D via the turned-on first transistor T1 to reset the anode, and at the same time, the Data signal supplied from the Data line Data is transmitted to the driving transistor T0 via the turned-on third transistor T3 and the turned-on fourth transistor T4, the Data signal is written to the driving transistor T0, and the threshold voltage of the driving transistor T0 is compensated.
In the third period T3, the emission control signal line Emit supplies a low level, the first scan signal line S1 (the third scan signal line S3) and the second scan signal line S2 supply a high level, and the driving current converted by the data signal and the power signal is transmitted to the anode of the organic light emitting diode D via the turned-on fifth transistor T5 and sixth transistor T6, driving the organic light emitting diode D to Emit light.
And, at the pull-down timing T after the period T2, the pull-down module 2 performs a pull-down operation on the potential of the anode of the organic light emitting diode D with a pull-down signal. It should be noted that, the step of pulling down the potential of the anode of the organic light emitting diode D by using the pull-down signal may be performed before the light emitting control signal is stepped down, or may be performed after the light emitting control signal is stepped down, for example, please refer to fig. 2 again, the step-down time of the pull-down signal is before the light emitting control signal is stepped down, so that the anode potential is pulled down before the light emitting of the organic light emitting diode D is emitted, and it is ensured that the anode potential is not affected by the pulled-down potential in the light emitting process of the organic light emitting diode D, and the accuracy of the light emitting brightness is improved.
In addition, it should be noted that, in some pixel driving circuits, the light-emitting brightness of the organic light-emitting diode D may be controlled by the duty ratio of the light-emitting control signal, for example, the longer the duration of the enable level in the light-emitting control signal is, the greater the light-emitting brightness of the organic light-emitting diode D is, and at this time, the light-emitting control signal has at least two pulses in one frame time. In the pixel driving circuit that does not use the duty ratio of the emission control signal to control the emission luminance of the organic light emitting diode D, the emission control signal has only one pulse within one frame time, in this case, when the enable level of the emission control signal is a low level, as shown in fig. 5 and 6, fig. 5 is still another structural schematic diagram of the pixel driving circuit provided in the embodiment of the present invention, fig. 6 is a signal timing diagram corresponding to the pixel driving circuit shown in fig. 5, the pull-down signal line SC may be multiplexed with the emission control signal line Emit, and the pull-down of the anode potential is realized by using the transition of the emission control signal.
When the light emitting control signal has only one pulse within a frame time, with reference to fig. 6, the light emitting control signal has only one rising edge and one falling edge, and the falling edge is located after the anode reset of the organic light emitting diode D is completed, so that the anode potential can be pulled down by using the jump of the light emitting control signal.
An embodiment of the present invention further provides a driving method for a pixel driving circuit, where the driving method is used to drive the pixel driving circuit, and as shown in fig. 7 in conjunction with fig. 1 and fig. 2, fig. 7 is a flowchart of the driving method provided in the embodiment of the present invention, and the driving method includes:
step S1: the anode reset module 1 resets the anode of the organic light emitting diode D by using a reset signal under the control of the first scan signal.
Step S2: the pull-down module 2 pulls down the potential of the anode of the organic light emitting diode D by using the pull-down signal.
By adopting the driving method provided by the embodiment of the invention, the anode potential of the organic light-emitting diode D can be further pulled down by utilizing the pull-down signal, so that the anode potential of the organic light-emitting diode D is pulled to a lower potential from the reset potential. Therefore, the voltage difference between the potential after the anode is pulled down and the lighting potential corresponding to the organic light emitting diode D is increased, so that the anode can contain more charges leaked from the anodes of other organic light emitting diodes D, the risk of light emission of the organic light emitting diodes D under the action of leakage current is reduced, the phenomenon of stealing lighting of sub-pixels is effectively improved, and the display performance of the display panel is optimized. Moreover, when the display panel displays a full-black picture, the basic potential of the anode of the organic light emitting diode D is pulled low, so that the anode of the organic light emitting diode D can reach the standard potential corresponding to the 0 gray scale only by receiving a larger driving current, and therefore, the driving chip can realize full-black display only by providing a smaller dark-state voltage without increasing the dark-state voltage, thereby avoiding the situation that the dark-state voltage exceeds the output capacity of the driving chip, avoiding the problem that the driving chip cannot support, and effectively ensuring normal display of the low-gray-scale picture.
Optionally, after the anode of the organic light emitting diode D is reset by the anode reset module 1, the pull-down module 2 pulls down the potential of the anode of the organic light emitting diode D, so that the influence of a pull-down signal on the normal reset of the anode is avoided, and the reliability of the reset and the potential pull-down is ensured.
Optionally, referring to fig. 1 again, the pull-down module 2 includes a pull-down capacitor C, a first plate of the pull-down capacitor C is electrically connected to the pull-down signal line SC, and a second plate of the pull-down capacitor C is electrically connected to an anode of the organic light emitting diode D.
Based on this, the process of resetting the anode of the organic light emitting diode D by the anode resetting module 1 includes: when the first scanning signal jumps from the non-enable level to the enable level, the anode reset module 1 resets the anode of the organic light emitting diode D by using the reset signal, and when the first scanning signal jumps from the enable level to the non-enable level, the anode reset module 1 stops resetting the anode of the organic light emitting diode D.
The process of the pull-down module 2 pulling down the potential of the anode of the organic light emitting diode D includes: after the first scanning signal jumps from the enable level to the disable level, the pull-down signal jumps from the high level to the low level, and the pull-down capacitor C pulls down the potential of the anode of the organic light emitting diode D.
At the moment, the pull-down signals maintain a stable high level in the reset period, and then jump down after the anode reset is finished, so that the influence of the potential change of the pull-down signals on the normal reset of the anode is avoided, and the reliability of the reset and potential pull-down is ensured.
Optionally, referring to fig. 3 and 4 again, the pull-down module 2 includes a pull-down transistor PD _ T, a control electrode of the pull-down transistor PD _ T is electrically connected to the pull-down control signal line PD _ L, a first plate of the pull-down transistor PD _ T is electrically connected to the pull-down signal line SC, and a second plate of the pull-down transistor PD _ T is electrically connected to an anode of the organic light emitting diode D.
The process of resetting the anode of the organic light emitting diode D by the anode resetting module 1 includes: when the first scanning signal jumps from the non-enable level to the enable level, the anode reset module 1 resets the anode of the organic light emitting diode D by using the reset signal, and when the first scanning signal jumps from the enable level to the non-enable level, the anode reset module 1 stops resetting the anode of the organic light emitting diode D.
The process of the pull-down module 2 pulling down the potential of the anode of the organic light emitting diode D includes: after the first scanning signal jumps from the enable level to the non-enable level, the pull-down control signal jumps from the non-conducting level to the conducting level to control the pull-down transistor PD _ T to conduct, the pull-down signal provides a pull-down potential, and the pull-down transistor PD _ T transmits the pull-down potential to the anode of the organic light emitting diode D, wherein the pull-down potential is smaller than the potential of the reference signal.
At this time, after the anode reset is finished, the pull-down control signal controls the pull-down transistor PD _ T to be turned on again, so that the influence of the pull-down signal transmitted by the pull-down transistor PD _ T on the normal reset of the anode is avoided, and the reliability of reset and potential pull-down is ensured.
Optionally, referring to fig. 1 and fig. 3 again, the pixel driving circuit further includes: a driving transistor T0, a gate of the driving transistor T0 being electrically connected to the first node N1, a first pole of the driving transistor T0 being electrically connected to the second node N2, a second pole of the driving transistor T0 being electrically connected to the third node N3; a first node reset module 3, wherein the first node reset module 3 is electrically connected to the second scan signal line S2, the reset signal line Vref and the first node N1 respectively; a charging module 4, wherein the charging module 4 is electrically connected to the third scanning signal line S3, the Data line Data, the second node N2, the third node N3 and the first node N1 respectively; the light emitting control module 5, the light emitting control module 5 is respectively electrically connected with the light emitting control signal line Emit, the power signal line PVDD, the second node N2, the third node N3 and the anode of the organic light emitting diode D; the first scanning signal line S1 is multiplexed with the second scanning signal line S2, or the first scanning signal line S1 is multiplexed with the third scanning signal line S3.
Based on this, in connection with the related explanation of the driving principle of the pixel driving circuit in the above embodiment, the driving method further includes:
the first node resetting module 3 resets the first node N1 by using a reset signal under the control of the second scan signal; the charging module 4 writes the Data signal provided by the Data line Data into the driving transistor T0 under the control of the third scanning signal; the light emission control module 5 supplies the driving current converted via the data signal and the power signal to the anode of the organic light emitting diode D under the control of the light emission control signal.
In conjunction with fig. 5 and 6, the emission control signal supplied from the emission control signal line Emit has a pulse within one frame time, and the enable level of the emission control signal is a low level. At this time, the process of the pull-down module 2 pulling down the potential of the anode of the organic light emitting diode D includes: the pull-down module 2 pulls down the potential of the anode of the organic light emitting diode D by using the light emitting control signal.
When the light-emitting control signal only has one pulse within one frame time, the light-emitting control signal only has one rising edge and one falling edge, and the falling edge is positioned after the anode reset of the organic light-emitting diode D is finished, so that the anode potential can be pulled down by utilizing the jump of the light-emitting control signal.
As shown in fig. 8, fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention, where the display panel includes a plurality of sub-pixels 100, and each sub-pixel includes the pixel driving circuit 200 and an organic light emitting diode D electrically connected to the pixel driving circuit 200. The specific structure of the pixel driving circuit 200 has been described in detail in the above embodiments, and is not described herein again.
Because the display panel provided by the embodiment of the invention comprises the pixel driving circuit 200, the display panel can further pull down the anode potential of the organic light emitting diode D, so that the phenomenon of stealing and lighting of sub-pixels can be effectively improved, the display performance of the display panel is optimized, and the increase of dark-state voltage can be avoided, thereby avoiding the problem that a driving chip cannot support the display panel and effectively ensuring the normal display of low-gray-scale pictures.
In addition, it should be noted that, in combination with the analysis of the foregoing embodiment, when the display panel includes the first color sub-pixel, the second color sub-pixel and the third color sub-pixel, since the lighting voltage of the organic light emitting diode D in the first color sub-pixel is lower than the lighting voltage corresponding to the organic light emitting diode D in the second color sub-pixel and the third color sub-pixel, the phenomenon of lighting stealing of the sub-pixel is more likely to occur in the first color sub-pixel.
As shown in fig. 9, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the display device includes the display panel 300. Of course, the display device shown in fig. 9 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Because the display device provided by the embodiment of the invention comprises the display panel 300, the display device can effectively improve the phenomenon of stealing and lighting of sub-pixels, optimize the display performance, avoid the increase of dark-state voltage, avoid the problem that a driving chip cannot support the increase of dark-state voltage, and effectively ensure the normal display of low-gray-scale pictures.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
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 (15)
1. A pixel driving circuit, comprising:
the anode reset module is respectively electrically connected with the first scanning signal line, the reset signal line and the anode of the organic light-emitting diode and is used for resetting the anode of the organic light-emitting diode by utilizing the reset signal under the control of the first scanning signal;
and the pull-down module is respectively electrically connected with the pull-down signal line and the anode of the organic light-emitting diode and is used for pulling down the potential of the anode of the organic light-emitting diode by using the pull-down signal.
2. The pixel driving circuit according to claim 1, wherein the pull-down module comprises a pull-down capacitor;
the first polar plate of the pull-down capacitor is electrically connected with the pull-down signal wire, and the second polar plate of the pull-down capacitor is electrically connected with the anode of the organic light-emitting diode.
3. The pixel driving circuit of claim 2, wherein the first scan signal has a first transition edge and a second transition edge, wherein the first transition edge transitions from a non-enable level to an enable level, wherein the second transition edge transitions from the enable level to the non-enable level, and wherein the first transition edge precedes the second transition edge;
the pull-down signal has a rising edge and a falling edge, the falling edge of the pull-down signal being located after the second transition edge.
4. The pixel driving circuit of claim 2, wherein the first scan signal has a first transition edge and a second transition edge, wherein the first transition edge transitions from a non-enable level to an enable level, wherein the second transition edge transitions from the enable level to the non-enable level, and wherein the first transition edge precedes the second transition edge;
the pull-down signal has a rising edge and a falling edge, the rising edge of the pull-down signal precedes the first transition edge.
5. The pixel driving circuit according to claim 1, wherein the pull-down module comprises a pull-down transistor;
the control electrode of the pull-down transistor is electrically connected with a pull-down control signal line, the first electrode of the pull-down transistor is electrically connected with the pull-down signal line, and the second electrode of the pull-down transistor is electrically connected with the anode of the organic light-emitting diode.
6. The pixel driving circuit of claim 5, wherein the first scan signal has a first transition edge and a second transition edge, wherein the first transition edge transitions from a non-enable level to an enable level, wherein the second transition edge transitions from the enable level to the non-enable level, and wherein the first transition edge precedes the second transition edge;
the pull-down control signal has a conducting level and a non-conducting level, and the moment when the non-conducting level jumps to the conducting level is positioned behind the second jumping edge;
the pull-down signal has a pull-down potential that is less than a potential of the reset signal.
7. The pixel driving circuit according to claim 1, further comprising:
the grid electrode of the driving transistor is electrically connected with a first node, the first pole of the driving transistor is electrically connected with a second node, and the second pole of the driving transistor is electrically connected with a third node;
the first node resetting module is respectively electrically connected with a second scanning signal line, the resetting signal line and the first node and is used for resetting the first node by utilizing the resetting signal under the control of a second scanning signal;
the charging module is respectively electrically connected with a third scanning signal line, a data line, the second node, the third node and the first node, and is used for writing a data signal into the driving transistor under the control of a third scanning signal and compensating the threshold voltage of the driving transistor;
a light emission control module electrically connected to a light emission control signal line, a power signal line, the second node, the third node, and an anode of the organic light emitting diode, respectively, for supplying a driving current converted via the data signal and the power signal to the anode of the organic light emitting diode under the control of a light emission control signal;
the first scanning signal line and the second scanning signal line are multiplexed, or the first scanning signal line and the third scanning signal line are multiplexed.
8. The pixel driving circuit according to claim 7, wherein the emission control signal has a pulse and an enable level of the emission control signal is a low level during one frame time;
the pull-down signal line is multiplexed with the light emission control signal line.
9. A driving method of a pixel driving circuit, the driving method being for driving the pixel driving circuit according to claim 1, comprising:
the anode reset module resets the anode of the organic light emitting diode by utilizing a reset signal under the control of a first scanning signal;
and the pull-down module utilizes the pull-down signal to pull down the potential of the anode of the organic light-emitting diode.
10. The driving method according to claim 9, wherein the pull-down module pulls down the potential of the anode of the organic light emitting diode after the anode reset module resets the anode of the organic light emitting diode.
11. The driving method according to claim 9,
the pull-down module comprises a pull-down capacitor, a first polar plate of the pull-down capacitor is electrically connected with the pull-down signal line, and a second polar plate of the pull-down capacitor is electrically connected with the anode of the organic light-emitting diode;
the process that the anode resetting module resets the anode of the organic light-emitting diode comprises the following steps: when the first scanning signal jumps from a non-enabling level to an enabling level, the anode resetting module resets the anode of the organic light emitting diode by using a resetting signal, and when the first scanning signal jumps from the enabling level to the non-enabling level, the anode resetting module stops resetting the anode of the organic light emitting diode;
the process of the pull-down module for pulling down the potential of the anode of the organic light-emitting diode comprises the following steps: after the first scanning signal jumps from the enabling level to the non-enabling level, the pull-down signal jumps from a high level to a low level, and the pull-down capacitor pulls down the potential of the anode of the organic light-emitting diode.
12. The driving method according to claim 9, wherein the pull-down module includes a pull-down transistor, a control electrode of the pull-down transistor is electrically connected to a pull-down control signal line, a first plate of the pull-down transistor is electrically connected to the pull-down signal line, and a second plate of the pull-down transistor is electrically connected to an anode of the organic light emitting diode;
the process that the anode resetting module resets the anode of the organic light-emitting diode comprises the following steps: when the first scanning signal jumps from a non-enabling level to an enabling level, the anode resetting module resets the anode of the organic light emitting diode by using a resetting signal, and when the first scanning signal jumps from the enabling level to the non-enabling level, the anode resetting module stops resetting the anode of the organic light emitting diode;
the process of the pull-down module for pulling down the potential of the anode of the organic light-emitting diode comprises the following steps: after the first scanning signal jumps from the enabling level to the non-enabling level, a pull-down control signal jumps from a non-conducting level to a conducting level to control the pull-down transistor to conduct, the pull-down signal provides a pull-down potential, and the pull-down transistor transmits the pull-down potential to the anode of the organic light emitting diode, wherein the pull-down potential is smaller than the potential of the reference signal.
13. The driving method according to claim 9, wherein the pixel driving circuit further comprises:
the grid electrode of the driving transistor is electrically connected with a first node, the first pole of the driving transistor is electrically connected with a second node, and the second pole of the driving transistor is electrically connected with a third node;
the first node resetting module is electrically connected with a second scanning signal line, the resetting signal line and the first node respectively;
a charging module electrically connected to a third scanning signal line, a data line, the second node, the third node, and the first node, respectively;
a light emission control module electrically connected to a light emission control signal line, a power signal line, the second node, the third node, and an anode of the organic light emitting diode, respectively;
the first scanning signal line is multiplexed with the second scanning signal line, or the first scanning signal line is multiplexed with the third scanning signal line;
the driving method further includes:
the first node resetting module resets the first node by using the resetting signal under the control of a second scanning signal;
the charging module writes a data signal provided by the data line into the driving transistor under the control of a third scanning signal;
the light emitting control module supplies a driving current converted by the data signal and the power signal to an anode of the organic light emitting diode under the control of a light emitting control signal, wherein the light emitting control signal supplied by the light emitting control signal line has one pulse within one frame time, and an enable level of the light emitting control signal is a low level;
the process of the pull-down module for pulling down the potential of the anode of the organic light-emitting diode comprises the following steps: and the pull-down module utilizes the light-emitting control signal to pull down the potential of the anode of the organic light-emitting diode.
14. A display panel, comprising:
a plurality of sub-pixels comprising the pixel driving circuit according to any one of claims 1 to 8, and an organic light emitting diode electrically connected to the pixel driving circuit.
15. A display device characterized by comprising the display panel according to claim 14.
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