CN111968574B - Display device and driving method - Google Patents

Display device and driving method Download PDF

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Publication number
CN111968574B
CN111968574B CN202010916700.0A CN202010916700A CN111968574B CN 111968574 B CN111968574 B CN 111968574B CN 202010916700 A CN202010916700 A CN 202010916700A CN 111968574 B CN111968574 B CN 111968574B
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module
reset
light
driving
electrically connected
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CN111968574A (en
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符鞠建
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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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]

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The embodiment of the invention discloses a display device and a driving method. The display device comprises a plurality of pixels arranged in an array; the pixel includes a light emitting element and a driving circuit; the method comprises the following steps: s1, providing a reset signal to the anode of the light emitting element in the data writing phase of each frame driving period; s2, providing a reset signal to the anode of the light emitting element at least once in the holding phase of each frame driving period; wherein the voltage value of the reset signal gradually increases in each frame driving period. The driving method of the display device provided by the embodiment of the invention can effectively reduce the problem of flicker of the display panel.

Description

Display device and driving method
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display device and a driving method.
Background
Organic Light-Emitting Diode (OLED) display panels are widely favored because they have the advantages of self-luminescence, high contrast, thin thickness, fast response speed, and applicability to flexible panels.
The OLED element of the OLED display panel belongs to a current-driven type element, and a corresponding pixel driving circuit needs to be provided to supply a driving current to the OLED element so that the OLED element can emit light. The pixel driving circuit of the OLED display panel generally includes a driving transistor, a reset transistor, and the like, and in a reset stage, the reset transistor is turned on, and the reset transistor resets an anode of the OLED element, thereby preventing an influence of a previous frame signal on a next frame signal; in the light emitting phase, the reset transistor is turned off, and the driving transistor can generate a driving current for driving the OLED element according to a voltage of its gate. However, due to the characteristics of the transistor, leakage may occur, so that the driving current of the OLED device gradually decreases, resulting in a large difference in the light emitting brightness within one frame. Especially for the low frequency driving mode, the brightness difference is more obvious, resulting in the problem of flicker of the display panel.
Disclosure of Invention
The embodiment of the invention provides a driving method of a display device and the display device, which can effectively reduce the problem of flicker of a display panel.
In a first aspect, an embodiment of the present invention provides a driving method for a display device, where the display device includes a plurality of pixels arranged in an array; the pixel includes a light emitting element and a driving circuit; the method comprises the following steps:
s1, providing a reset signal to the anode of the light emitting element in the data writing phase of each frame driving period;
s2, providing a reset signal to the anode of the light emitting element at least once in the holding phase of each frame driving period;
wherein the voltage value of the reset signal gradually increases in each frame driving period.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes a plurality of pixels arranged in an array; the pixel includes a light emitting element and a driving circuit; the driving circuit comprises a reset module; the reset module is electrically connected with the anode of the light-emitting element;
the display device further comprises a controller; the controller is used for controlling the reset module to provide a reset signal to the anode of the light-emitting element in a data writing phase of each frame driving period; controlling the reset module to provide a reset signal to the anode of the light emitting element at least once in a holding phase of each frame driving period;
wherein the voltage value of the reset signal gradually increases in each frame driving period.
The embodiment of the invention provides a display device and a driving method, wherein a reset signal is provided for an anode of a light-emitting element in a data writing stage of each frame of driving period, so that the influence of a previous frame of signal on a next frame of signal is prevented; and in the holding stage, a reset signal is provided for the anode of the light-emitting element at least once, namely the light-emitting element is in a bright state and a dark state which are alternately changed in the holding stage, so that the phenomenon that human eyes can sense flicker due to large difference of the light-emitting brightness of the light-emitting element caused by leakage current in the long holding stage is avoided. In addition, the invention also sets the voltage value of the reset signal to be gradually increased, so that the dark state brightness of the light-emitting element is gradually increased in the holding stage, the gradual reduction of the bright state brightness of the light-emitting element caused by leakage current is avoided, and human eyes can perceive the flicker caused by the continuous reduction of the brightness of the light-emitting element in the holding stage.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic diagram of a driving circuit in the prior art;
FIG. 2 is a timing diagram of a prior art driver circuit;
fig. 3 is a schematic structural diagram of a pixel in a display device according to an embodiment of the present invention;
fig. 4 is a flowchart of a driving method of a display device according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the luminance of a light-emitting element in each frame driving period in a display device according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a reset signal according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a reset signal according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a pixel in another display device according to an embodiment of the invention;
fig. 9 is a flowchart of a driving method of a display device according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
FIG. 11 is a timing diagram of a driving circuit according to an embodiment of the present invention;
fig. 12 is a flowchart of a driving method of a display device according to another embodiment of the present invention;
FIG. 13 is a schematic diagram of a structure of another driving circuit according to an embodiment of the present invention;
FIG. 14 is a timing diagram of a driving circuit according to another embodiment of the present invention;
FIG. 15 is a schematic diagram of a driving circuit according to another embodiment of the present invention;
FIG. 16 is a schematic structural diagram of another driving circuit according to an embodiment of the present invention;
fig. 17 is a timing diagram of a further driving circuit according to an embodiment of the present invention;
fig. 18 is a timing diagram of a further driving circuit according to an embodiment of the present invention;
FIG. 19 is a schematic diagram of a driving circuit according to another embodiment of the present invention;
FIG. 20 is a schematic diagram of a driving circuit according to another embodiment of the present invention;
fig. 21 is a timing diagram of another driving circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
Fig. 1 is a schematic configuration diagram of a driving circuit in the related art, and fig. 2 is a timing diagram of a driving circuit in the related art, and as shown in fig. 1 and 2, the driving circuit in the related art includes a reset transistor M1 ' and a first light emission controlling transistor M2 ', a first pole of the reset transistor M1 ' is electrically connected to a reset signal line REF ', a second pole of the reset transistor M1 ' and a second pole of the first light emission controlling transistor M2 ' are electrically connected to an anode of a light emitting element 20 ', a gate of the reset transistor M1 ' is electrically connected to a first scan signal line S1 ', and a gate of the first light emission controlling transistor M2 ' is electrically connected to the first light emission controlling signal line MIT '. In the data writing phase TA', the first scan signal S11' obtained by the gate of the reset transistor M1 'from the first scan signal terminal S1' is at a low level, the first emission control signal Emit 'obtained by the gate of the first emission control transistor M2' from the first emission control signal terminal MIT 'is at a high level, at this time, the first emission control transistor M2' is turned off, the reset transistor M1 'is turned on, and the reset signal line REF' supplies a reset signal Vref 'to write to the anode of the light emitting element 20' through the turned-on reset transistor M1 'to reset the anode of the light emitting element 20'; in a holding phase TB', the first scan signal S11' obtained by the gate of the reset transistor M1 'from the first scan signal terminal S1' is at a high level, the first emission control signal Emit 'obtained by the gate of the first emission control transistor M2' from the first emission control signal terminal MIT 'is at a low level, at this time, the first emission control transistor M2' is turned on, the reset transistor M1 'is turned off, and the driving current flows into the light emitting element 20' through the first emission control transistor M2 'to drive the light emitting element 20', thereby driving the light emitting elementThe movable light emitting element 20' emits light. However in the hold phase TB' the reset transistor M1 ' is in an off state, and due to the characteristics of the transistor itself, leakage may occur, so that the driving current of the light emitting element 20 ' is gradually reduced, resulting in a large difference in light emitting brightness between the start time and the last time in a frame, and further resulting in human eyes being able to perceive flicker; it may also cause that the brightness difference between the light-emitting end stage of the current frame and the light-emitting start stage of the next frame is larger, so that people can perceive the flicker more seriously.
In view of the foregoing technical problems, an embodiment of the present invention provides a display device, which includes a plurality of pixels arranged in an array; the pixel includes a light emitting element and a driving circuit; supplying a reset signal to an anode of the light emitting element in a data writing stage of each frame driving period; supplying a reset signal to an anode of the light emitting element at least once in a holding period of each frame driving period; wherein the voltage value of the reset signal gradually increases in each frame driving period. Fig. 3 is a schematic structural diagram of a pixel in a display device according to an embodiment of the present invention, fig. 4 is a flowchart of a driving method of a display device according to an embodiment of the present invention, and as shown in fig. 4, the driving method of a display device according to an embodiment of the present invention includes:
s1, a reset signal is supplied to the anode of the light emitting element in the data writing phase of each frame driving period.
Therein, referring to fig. 3, the pixel includes a light emitting element 20 and a driving circuit 30.
Specifically, in the data writing phase of each frame driving period, a reset signal is supplied to the anode of the light emitting element 20 to reset the potential of the anode of the light emitting element 20, thereby preventing the voltage of the anode of the light emitting element 20 of the previous frame from affecting the voltage of the anode of the light emitting element 20 of the next frame.
S2, providing a reset signal to the anode of the light emitting element at least once in the holding phase of each frame driving period; wherein the voltage value of the reset signal gradually increases in each frame driving period.
Specifically, in the holding stage of the same frame driving period, the reset signal is provided to the anode of the light emitting element 20 at least once, so that the light emitting element 20 is in an alternate change of the bright state and the dark state in the holding stage, that is, the change frequency of the bright state and the dark state of the light emitting element in the frame driving period is increased, and the problem that human eyes perceive flicker due to continuous decrease of the brightness of the bright state of the light emitting element in the holding stage caused by leakage current is avoided.
Further, in the present embodiment, the voltage value of the reset signal gradually increases in each frame driving period, and thus the luminance of the light emitting element 20 in the dark state gradually increases. As can be seen from the foregoing, in the holding phase of the driving period, the reset transistor electrically connected to the anode of the light emitting element is turned off, so that the driving current for driving the light emitting element is gradually reduced, that is, in the holding phase of the driving period of the same frame, the light emitting luminance is gradually reduced with the lapse of the light emitting time when the light emitting element is in the bright state. Accordingly, the present embodiment sets the voltage value of the reset signal to gradually increase in each frame driving period, so that the luminance of the light emitting element 20 in a dark state (the reset signal is supplied to the anode of the light emitting element 20) is increased. Fig. 5 is a schematic diagram of the light emitting brightness of the light emitting element 20 in each frame driving period in the display device according to the embodiment of the present invention. Referring to fig. 5, since the luminance of each bright state of the light emitting element 20 is gradually decreased and the luminance of the dark state is gradually increased in each frame driving period, the luminance of the light emitting element 20 perceived by human eyes is almost unchanged in each frame driving period, preventing the problem that human eyes can perceive the display panel to flicker.
Optionally, fig. 6 is a schematic diagram of a reset signal according to an embodiment of the present invention, and as shown in fig. 6, in each frame of driving period, the voltage value of the reset signal gradually increases, which may be a linear increase of the voltage value of the reset signal; alternatively, fig. 7 is a schematic diagram of another reset signal provided by an embodiment of the present invention, and as shown in fig. 7, the voltage value of the reset signal gradually increases in each frame driving period, which may be a stepwise increase of the voltage value of the reset signal.
If the voltage value of the reset signal increases linearly in each frame driving period, optionally, before step S1, the brightness decrease slope of the pixel in the frame driving period may be obtained; the luminance decrease slope of the pixel is determined as a slope at which the voltage value of the reset signal linearly increases.
For example, the brightness falling slope of the pixel in the driving period may be acquired by an external brightness acquisition sensor, and after the brightness falling slope of the pixel in the driving period is determined, the slope of the linear increase of the voltage value of the reset signal may be determined based on the brightness falling slope of the pixel, for example, the brightness falling slope of the pixel is the same as the slope of the linear increase of the voltage value of the reset signal.
If the voltage value of the reset signal is increased in a stepwise manner in each frame of driving period, the voltage value of the reset signal may be increased in a stepwise manner in an arithmetic progression in each frame of driving period, that is, the voltage value of the reset signal increased each time is the same in each frame of driving period; the voltage value of each increase of the reset signal can be set to be different according to the design requirement of an actual product. The embodiment is not particularly limited to this, and the voltage value increased each time is also not limited, and those skilled in the art can set the voltage value according to actual situations.
It should be noted that, as those skilled in the art can understand, the manner of gradually increasing the voltage value of the reset signal includes, but is not limited to, the above examples, and those skilled in the art can set the manner of gradually increasing the voltage value of the reset signal according to the needs of the product, and the present invention is not limited in particular.
It should be noted that the voltage value of the reset signal gradually increases, and may start to increase at the data writing stage of each frame of the driving period, or start to increase at the holding stage of each frame of the driving period.
It should be noted that the present embodiment does not limit the configuration in which the reset signal is supplied to the anode of the light emitting element at least once in the holding period of each frame driving period, as long as the reset signal is supplied to the anode of the light emitting element at least once in the holding period of each frame driving period.
Optionally, the driving circuit includes a reset module; the reset module is electrically connected with the anode of the light-emitting element; the display device further includes a controller; the controller is used for controlling the reset module to provide a reset signal to the anode of the light-emitting element in the data writing phase of each frame of driving period; controlling the reset module to provide a reset signal to the anode of the light-emitting element at least once in the holding stage of each frame of driving period; wherein the voltage value of the reset signal gradually increases in each frame driving period. Fig. 8 is a schematic structural diagram of a pixel in another display device according to an embodiment of the present invention, and fig. 9 is a flowchart of a driving method of another display device according to an embodiment of the present invention, as shown in fig. 9, the driving method of a display device according to an embodiment of the present invention includes:
s1, the reset module supplies a reset signal to the anode of the light emitting element in the data writing phase of each frame driving period.
Here, referring to fig. 8, the pixel includes a light emitting element 20 and a driving circuit 30; the driving circuit 30 includes a reset module 31; the reset module 31 is electrically connected to the anode of the light emitting element 20.
Specifically, in the data writing phase of each frame driving period, the reset module 31 supplies a reset signal to the anode of the light emitting element 20 to reset the anode potential of the light emitting element 20, so as to prevent the voltage of the anode of the light emitting element 20 in the previous frame from influencing the voltage of the anode of the light emitting element 20 in the next frame.
S2, in the holding phase of each frame driving period, the reset module provides a reset signal to the anode of the light-emitting element at least once; wherein the voltage value of the reset signal gradually increases in each frame driving period.
Specifically, in the holding phase of the same frame driving period, the reset module 31 provides the reset signal to the anode of the light emitting element 20 at least once, so that the light emitting element 20 exhibits an alternating change of the bright state and the dark state in the holding phase. I.e. the frequency of the change of the light emitting element between the bright state and the dark state in the frame driving period is increased. The problem that human eyes perceive flicker due to continuous reduction of brightness of the light-emitting element in a bright state in a holding stage caused by leakage current is avoided.
Further, in the present embodiment, in each frame driving period, the voltage value of the reset signal gradually increases, and thus the luminance of the light emitting element 20 in the dark state gradually increases, so that the luminance of the light emitting element 20 in the dark state (the reset module 31 supplies the reset signal to the anode of the light emitting element 20) increases. That is, since the luminance of each bright state of the light emitting element 20 gradually decreases and the luminance of the dark state gradually increases in each frame driving period, the luminance of the light emitting element 20 perceived by human eyes hardly changes in each frame driving period, preventing the problem that human eyes can perceive the display panel to flicker.
It should be noted that, as those skilled in the art can understand, the module that provides the reset signal to the anode of the light emitting element at the data writing stage of each frame of the driving period, and provides the reset signal to the anode of the light emitting element at least once at the holding stage of each frame of the driving period, and the voltage value of the reset signal gradually increases includes but is not limited to the reset module, and those skilled in the art can set the voltage value according to the actual situation, and the invention is not limited in particular.
In summary, in the driving method of the display device according to the embodiment of the invention, in the data writing stage of each frame driving period, the reset signal is provided to the anode of the light emitting element to prevent the previous frame signal from affecting the next frame signal; and in the holding stage, a reset signal is provided for the anode of the light-emitting element at least once, namely the light-emitting element is in a bright state and a dark state which are alternately changed in the holding stage, so that the phenomenon that human eyes can sense flicker due to large difference of the light-emitting brightness of the light-emitting element caused by leakage current in the long holding stage is avoided. In addition, the invention also sets the voltage value of the reset signal to be gradually increased, so that the dark state brightness of the light-emitting element is gradually increased in the holding stage, the gradual reduction of the bright state brightness of the light-emitting element caused by leakage current is avoided, and human eyes can perceive the flicker caused by the continuous reduction of the brightness of the light-emitting element in the holding stage.
Alternatively, the duration of supplying the reset signal to the anode of the light emitting element is gradually increased in each frame driving period.
Specifically, in this embodiment, the duration of providing the reset signal to the anode of the light emitting element is gradually increased, so that the brightness of the light emitting element in the dark state is further increased, that is, because the brightness of each bright state of the light emitting element in each frame of driving period is gradually decreased, while the voltage value of the reset signal is gradually increased in each frame of driving period, the duration of providing the reset signal to the anode of the light emitting element is also gradually increased, so that the brightness of the dark state is gradually increased, so that the brightness of the light emitting element in the holding stage can be further ensured to be kept consistent, and the problem that human eyes can sense the display panel to flicker is prevented.
For example, fig. 10 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention, and as shown in fig. 10, the control terminal of the reset module 31 is electrically connected to the first reset control signal line S1; the input end of the reset module 31 is electrically connected with a reset input signal line REF; the first reset control signal line S1 is used to transmit the first reset control signal S11, and the reset input signal line REF is used to transmit the reset signal Vref. The turn-on or turn-off time of the reset module 31 can be controlled by the first reset control signal S11, so as to control the duration of the reset module 31 providing the reset signal Vref to the anode of the light emitting element. For example, fig. 11 is a timing diagram of a driving circuit according to an embodiment of the present invention, as shown in fig. 11, when the first reset control signal S11 is at a low level, the reset module 31 is turned on, and when the first reset control signal S11 is at a high level, the reset module 31 is turned off, so that the duration of the first reset control signal S11 being at the low level can be controlled to gradually increase, so that the duration of the reset signal Vref being provided by the reset module 31 to the anode of the light emitting element 20 is gradually increased, thereby ensuring that the light emitting brightness of the light emitting element in the holding phase is kept consistent, and preventing human eyes from sensing the display panel to flicker.
Optionally, fig. 12 is a flowchart of a driving method of a display device according to another embodiment of the present invention, and as shown in fig. 12, the driving method of the display device includes:
s21, judging the driving mode of the display device; when the driving mode is the low frequency driving mode, executing steps S22 and S23; when the driving mode is the high frequency driving mode, performing step S24;
s22, in the data writing phase of each frame driving period, the reset module provides a reset signal to the anode of the light-emitting element;
s23, in the holding phase of each frame driving period, the reset module provides a reset signal to the anode of the light-emitting element at least once;
s24, in the data writing phase of each frame driving period, the reset module provides a reset signal to the anode of the light-emitting element; in the hold phase of each frame of the driving period, the reset module is closed.
Optionally, when the frame refresh frequency of the display device is less than or equal to 15HZ, determining that the driving mode of the display device is the low-frequency driving mode; and when the frame refreshing frequency of the display device is more than 15HZ, determining that the driving mode of the display device is the high-frequency driving mode. It can be understood that a person skilled in the art can classify the frame refresh frequency of the display device according to the actual situation of the product, and is not limited to that when the frame refresh frequency of the display device is less than or equal to 15HZ, the driving mode of the display device is the low-frequency driving mode, otherwise, the driving mode is the high-frequency driving mode; or when the frame refresh frequency of the display device is less than or equal to 20HZ, the driving mode of the display device is a low-frequency driving mode, otherwise, the driving mode is a high-frequency driving mode, and the like.
Specifically, the frame period of the low-frequency driving mode is longer, so that the driving current of the light-emitting element is reduced more greatly, the light-emitting brightness in the holding stage is reduced more greatly, and the difference between the light-emitting brightness at the starting moment and the light-emitting brightness at the last moment in one frame is more obvious. Accordingly, in this embodiment, when the driving mode of the display device is the low-frequency driving mode, in the holding stage of the same frame driving period, the reset module provides the reset signal to the anode of the light emitting element at least once, so that the light emitting element presents the alternate change of the bright state and the dark state in the holding stage, that is, the change frequency of the bright state and the dark state of the light emitting element in the frame driving period is increased, and the problem that the brightness of the light emitting element in the holding stage continuously decreases due to leakage current, so that human eyes perceive flicker is avoided. In addition, in this embodiment, the voltage value of the reset signal is set to gradually increase in each frame driving period, so that the brightness of the light emitting element in a dark state is increased, and the problem that human eyes can perceive flicker due to the fact that the frame period of the low-frequency driving mode is long and the brightness of the light emitting element in the holding stage is greatly reduced is solved.
It is understood that, a person skilled in the art may determine whether the reset module provides the reset signal to the anode of the light emitting element in the holding phase of each frame driving period according to actual conditions of the product, and the embodiment is not limited thereto.
Optionally, fig. 13 is a schematic structural diagram of another driving circuit provided in an embodiment of the present invention, and fig. 14 is a timing diagram of another driving circuit provided in an embodiment of the present invention, and as shown in fig. 13 and fig. 14, the driving circuit 30 further includes a first light emission control module 32; the first light emission control module 32 is electrically connected to the anode of the light emitting element 20; a control terminal of the first lighting control module 32 is electrically connected to the first lighting control signal line MIT; the control end of the reset module 31 is electrically connected with the first reset control signal line S1; the input end of the reset module 31 is electrically connected with a reset input signal line REF; hold phase TBComprising a first phase T arranged at periodic intervalsB1And a second stage TB2(ii) a In the data writing phase TAAnd each second stage TB2The first light emitting control module 32 is turned off, the reset module 31 is turned on, and the reset module 31 provides a reset signal Vref to the anode of the light emitting element 20; in each first stage TB1The first lighting control module 32 is turned on, and the reset module 31 is turned off.
Specifically, the first emission control signal line MIT is used to provide a first emission control signal Emit, and the first emission control module 32 is enabled to set the level of the first emission control signal Emit to be high or low during the data writing phase TAAnd each second stage TB2Cut-off in each first stage TB1When the first light emission control module 32 is turned on, for example, when the first light emission control signal Emit is at a high level, the first light emission control module 32 is turned off, and at this time, the driving circuit cannot drive the light emitting element 20 to Emit light; when the first emission control signal Emit is at a low level, the first emission control module 32 is turned on, so that the driving current drives the light emitting element 20 to Emit light through the first emission control module 32, that is, the first emission control signal Emit is in the hold period TBBy shape of PWM waveThe first light-emitting control module 32 is controlled to control the light-emitting time of the light-emitting element 20, so as to obtain the required brightness.
Specifically, the first reset control signal line S1 is used for providing the first reset control signal S11, so that the reset module 31 is enabled to perform the data writing period T by setting the level of the first reset control signal S11 high or lowAAnd each second stage TB2On, that is, when the reset module 31 is turned on, the first light emission control module 32 is turned off to supply the reset signal Vref to the anode of the light emitting element 20 through the reset module 31; in each first stage TB1The reset module 31 is turned off, that is, when the first light emitting control module 32 is turned on, the reset module 31 is turned off, so that the driving current drives the light emitting element 20 to emit light through the first light emitting control module 32.
Optionally, fig. 15 is a schematic structural diagram of another driving circuit provided in an embodiment of the present invention, and as shown in fig. 15, the driving circuit 10 further includes a data writing module 33, a driving module 34, a second light-emitting control module 35, a storage module 36, and an initialization module 37; the initialization module 37 and the driving module 34 are electrically connected to the first node N1; the driving module 34, the data writing module 33 and the second light emission control module 35 are electrically connected to the second node N2; the driving module 34 and the first lighting control module 32 are electrically connected to the third node N3; the DATA writing module 33 is electrically connected to the DATA signal line DATA; the second light emission control module 35 is electrically connected to the first power signal line PVDD; a first terminal of the memory module 36 is electrically connected to the first power supply signal line PVDD; a second terminal of memory module 36 is electrically connected to first node N1; the input end of the initialization module 37 is electrically connected with the initialization signal line; a control terminal of the second light emission control module 35 is electrically connected to the second light emission control signal line MIT; during the data writing phase of each frame driving period, the controller controls the data writing module 33 to provide the data signal Vdata to the driving module 34, and controls the initialization module 37 to provide the initialization signal to the first node N1.
The DATA signal line DATA is used for transmitting a DATA signal Vdata; the first power signal line PVDD is used for transmitting a first power signal VPVDD(ii) a The initialization signal line is used for transmitting an initialization signal; second light emission control signalThe line is used for transmitting a second light emission control signal.
Optionally, with continued reference to fig. 15, the first emission control signal line MIT is multiplexed into the second emission control signal line, that is, the signals received by the control terminal of the first emission control module 32 and the control terminal of the second emission control module 35 are both the first emission control signal unit; the reset input signal line REF is multiplexed into the initialization signal line, that is, the reset signal received by the reset transistor 31 and the initialization signal received by the initialization transistor 37 can both be Vref, so that the number of traces can be reduced, and the structure is simple.
Specifically, the data writing phase of each frame of driving cycle includes a first time period and a second time period, in the first time period, the initialization module 37 is turned on, the reset module 31, the first light-emitting control module 32, the data writing module 33, the driving module 34, and the second light-emitting control module 35 are turned off, and the initialization module 37 provides an initialization signal to the first node N1 to reset the control terminal of the driving module 34, so as to prevent the data signal of the previous frame from affecting the potential of the control terminal of the driving module 34 of the next frame. In the second time period, the data writing module 33 and the reset module 31 are turned on, the second light emission control module 35, the first light emission control module 32 and the initialization module 37 are turned off, the reset signal Vref is written into the anode of the light emitting element 20 through the turned-on reset module 31 to initialize the anode potential of the light emitting element 20, the influence of the voltage of the anode of the light emitting element 20 in the previous frame on the voltage of the anode of the light emitting element 20 in the next frame is reduced, the data writing module 33 provides the data signal to the driving module 34, and the storage module 36 stores the data signal transmitted to the driving module 34. In the first phase of the holding phase, the first light emitting control module 32 and the second light emitting control module 35 are turned on, the initialization module 37, the reset module 31, and the data writing module 33 are turned off, and the first light emitting control module 32 and the second light emitting control module 35 control the driving current generated by the driving module 34 to flow into the light emitting element 20 to drive the light emitting element 20 to emit light. In addition, in the second stage of the holding stage, the first light-emitting control module 32, the second light-emitting control module 35, the initialization module 37, and the data writing module 33 are turned off, the reset module 31 is turned on, and the reset module 31 provides the reset signal Vref to the anode of the light-emitting element 20, so that the light-emitting element 20 presents an alternating change of a bright state and a dark state in the holding stage, that is, the change frequency of the bright state and the dark state of the light-emitting element 20 in the frame driving period is increased, and the problem that the brightness of the light-emitting element 20 in the light-emitting state in the holding stage continuously decreases due to leakage current, and human eyes perceive flicker is avoided.
Optionally, with continued reference to fig. 15, the driving circuit 30 further includes a threshold compensation module 38, and the threshold compensation module 38 is configured to capture the threshold voltage of the driving module 34 during the second period of the data writing phase of each frame of the driving cycle, and write a signal with the threshold voltage to the first node N1, so that the driving current generated by the driving module 34 is independent of the threshold voltage of the driving module 34.
In the following, taking the driving circuit 30 as 7T1C (7 transistors and 1 storage capacitor), and taking the transistors as P-type transistors as examples, that is, the reset module 31 includes a first transistor M1, the first light-emitting control module 32 includes a second transistor M2, the data write module 33 includes a third transistor M3, the driving module 34 includes a fourth transistor M4, the second light-emitting control module 35 includes a fifth transistor M5, the initialization module 37 includes a sixth transistor M6, and the threshold compensation module 38 includes a seventh transistor M7 as examples, the operation principle of the driving circuit 30 will be specifically described, and it should be noted that fig. 16 takes the driving circuit 30 as a 7T1C (7 transistors and 1 storage capacitor) circuit as an example, but the driving circuit 30 is not limited to the arrangement of such a driving circuit, as long as the driving of the pixel can be realized. The number of elements such as transistors, the type of transistors, and the like in the driving circuit 30 are not limited in the embodiments of the present invention.
Fig. 17 is a driving timing diagram of another driving circuit according to an embodiment of the present invention.
At TA1Time period, i.e. data writing period TAThe second reset control signal S21 obtained from the gate of the sixth transistor M6 is at a low level, the first reset control signal S11 obtained from the gate of the first transistor M1 is at a low level, and the first transistor M1 and the sixth transistor M6 are turned on. And the scanning signal S31 transmitted by the scanning signal lineAnd the first emission control signal Emit transmitted by the first emission control signal line is at a high level, so that the third transistor M3, the second transistor M2, the fifth transistor M5, the fourth transistor M4, and the seventh transistor M7 are all turned off. The reset signal Vref transmitted through the reset input signal line is written into the gate of the fourth transistor M4 through the turned-on sixth transistor M6 to initialize the gate of the fourth transistor M4 to prevent the previous frame data signal, and the reset signal Vref transmitted through the reset input signal line affecting the gate potential of the frame is also written into the anode of the light emitting element 20 through the turned-on first transistor M1 to initialize the anode potential of the light emitting element 20 to reduce the influence of the voltage of the anode of the light emitting element 20 of the previous frame on the voltage of the anode of the light emitting element 20 of the next frame.
At TA2Time period, i.e. data writing period TAIn the second period, the second reset control signal S21 obtained at the gate of the sixth transistor M6 is at a high level, and the first emission control signal Emit transmitted through the first emission control signal line is at a high level, at which time the sixth transistor M6, the second transistor M2, and the fifth transistor M5 are all turned off. And the scan signal S31 transmitted by the scan signal line is at low level, the first reset control signal S11 obtained from the gate of the first transistor M1 is still at low level, and the first transistor M1, the third transistor M3 and the seventh transistor M7 are turned on. The data signal Vdata transmitted by the data signal line is written to the gate of the fourth transistor M4 through the third transistor M3, the fourth transistor M4, and the seventh transistor M7, and the gate potential of the fourth transistor M4 is gradually raised. Until the voltage difference between the gate voltage of the fourth transistor M4 and the first electrode (the second node N2) of the fourth transistor M4 is equal to the threshold voltage Vth of the fourth transistor M4, the fourth transistor M4 will be in a turned-off state. Since the potential of the first pole of the fourth transistor M4 keeps Vdata constant, when the fourth transistor M4 is turned off, the gate potential of the fourth transistor M4 is Vdata- | Vth |, where Vdata is the data signal voltage transmitted by the data signal line and Vth is the threshold voltage of the fourth transistor M4. At this time, the voltage difference Vc between the first electrode and the second plate of the storage capacitor Cst is: Vc-V1-V2-VPVDD- (Vdata- | Vth |), wherein V1 represents the potential of the first pole of the storage capacitor Cst, and V2 generationThe table stores the potential of the second pole of the capacitor Cst, where VPVDDA first power supply signal voltage value transmitted to the first power supply signal line.
At TA2In the time period, the voltage difference Vc between the first pole and the second pole of the storage capacitor Cst includes the threshold voltage Vth of the fourth transistor M4, that is, in the second time period of the data writing phase, the threshold voltage Vth of the fourth transistor M4 is captured and stored in the storage capacitor Cst.
At TB1In a time period, that is, in the holding phase, the second reset control signal S21 obtained from the gate of the sixth transistor M6 is at a high level, the first reset control signal S11 obtained from the gate of the first transistor M1 is at a high level, the scan signal S31 obtained from the gates of the third transistor M3 and the seventh transistor M7 is at a high level, and the scan signal S2 provided from the second scan signal terminal is at a low level, so that the gates of the sixth transistor M6, the first transistor M1, the third transistor M3 and the seventh transistor M7 are all turned off. The first emission control signal Emit transmitted by the first emission control signal line is a low level signal, so that the second transistor M2 and the fifth transistor M5 are both turned on. And the first power supply signal V transmitted by the first power supply signal linePVDDThe first pole of the fourth transistor M4 is written through the turned-on fifth transistor M5, and the voltage difference Vsg between the first pole of the fourth transistor M4 and the gate of the fourth transistor M4 is VPVDDVdata + | Vth |, the fourth transistor M4 generates a driving current, the driving current flows into the light emitting element 20 through the second transistor M2, the light emitting element 20 is driven to emit light, and the drain current Id of the fourth transistor M4 satisfies the following formula: the drive current Id is:
Figure BDA0002665267540000171
where μ is the carrier mobility, CoxIs the channel capacitance per unit area of the fourth transistor M4,
Figure BDA0002665267540000172
is the width-to-length ratio of the fourth transistor M4. Thus, the driving power generated by the fourth transistor M4The flow Id is independent of the threshold voltage Vth of the fourth transistor M4. The compensation of the threshold voltage of the fourth transistor M4 is realized, and the problem of abnormal display caused by the drift of the threshold voltage of the fourth transistor M4 is solved. At this stage, the first reset control signal S11 provided by the first reset control signal line S1 is at TB1The time period being high at TB2The time period is low, that is, the first transistor M1 provides the reset signal Vref to the anode of the light emitting element 20 at least once, so that the light emitting element 20 exhibits an alternating change of the bright state and the dark state in the holding period, that is, the change frequency of the bright state and the dark state of the light emitting element in the frame driving period is increased, and the light emitting element 20 is prevented from being influenced by the leakage current in the holding period TBThe continuous decrease in brightness of the bright state of (a) presents the problem of human eyes perceiving flicker. In addition, at this stage, the sixth transistor M6 is turned off, and the potential of the gate of the fourth transistor M4 is continuously leaked through the sixth transistor M6, which causes the voltage of the gate of the driving transistor to be reduced, and further causes the current driving the light emitting device 20 to be reduced, and the light emitting brightness to be reduced. Accordingly, in this embodiment, the voltage value of the reset signal Vref is set to gradually increase in each frame of the driving period, so that the luminance of the light emitting element 20 in the dark state (the first transistor M1 provides the reset signal to the anode of the light emitting element 20) is increased, that is, the luminance of each bright state of the light emitting element 20 is gradually decreased and the luminance of the dark state is gradually increased in each frame of the driving period, so that the luminance of the light emitting element perceived by the human eye is almost unchanged in each frame of the driving period, and the problem that the human eye can perceive the display panel to flicker is prevented.
It should be noted that the first transistor M1 may be turned on during the whole data writing period TAI.e. a first period of time TA1And a second time period TA2Are all turned on, or in the second time period TA2The present embodiment is not particularly limited, as long as the anode of the light emitting element 20 can be reset, and when the first transistor M1 is turned on, the second transistor M2 is in an off state, so that the influence of the reset signal Vref on the driving current is avoided, and the reliability of the circuit is improved.
Optionally, the seventh transistor M7 and the sixth transistor M6 include, for example, oxide transistors, which can reduce leakage current when the seventh transistor M7 and the sixth transistor M6 are turned off. The seventh transistor M7 and the sixth transistor M6 may also be a multi-gate structure, such as a double-gate structure. Thus, when the light emitting device 20 emits light, it is beneficial to reduce the interference of the drain currents of the seventh transistor M7 and the sixth transistor M6 on the fourth transistor M4, and further avoid affecting the driving current of the fourth transistor M4 driving the light emitting device 20, thereby being beneficial to improving the accuracy of controlling the light emitting brightness of the light emitting device 20.
Optionally, the effective reset control pulse of the first reset control signal line and the effective light emitting control pulse of the first light emitting control signal line are not overlapped.
The first reset control signal line is used for providing a first reset control signal, the first light-emitting control signal line is used for providing a first light-emitting control signal, and an effective reset control pulse of the first reset control signal line is not overlapped with an effective light-emitting control pulse of the first light-emitting control signal line, namely the effective reset control pulse of the first reset control signal is not overlapped with the effective light-emitting control pulse of the first light-emitting control signal.
Illustratively, with continued reference to fig. 14, the active reset control pulse of the first reset control signal S11 and the active reset control pulse of the first emission control signal Emit are both low level, and when the active reset control pulse of the first reset control signal S11 and the active emission control pulse of the first emission control signal Emit do not overlap, that is, the time period when the reset module 31 is turned on and the time period when the first emission control module 32 is turned off overlap; or the time period when the reset module 31 is turned on is within the time period when the first light-emitting control module 32 is turned off, as shown in fig. 18, fig. 18 is a timing diagram of another driving circuit provided by the embodiment of the present invention, which is advantageous in that the reset module 31 provides the reset signal Vref to the anode of the light-emitting element 20 when the light-emitting element 20 is driven to emit light by the driving circuit of the first light-emitting control module 32, which affects the normal display of the light-emitting element 20.
Optionally, fig. 19 is a schematic structural diagram of another display device according to an embodiment of the present invention, and as shown in fig. 19, the reset module 31 includes a first reset module 311 and a second reset module 312; the driving circuit 30 further includes a driving module 34 and a first light emitting control module 32; the first light emitting control module 32 and the second reset module 312 are electrically connected to the driving module 34 at the third node N3; the first light emission control module 32 is electrically connected to the anode of the light emitting element 20; a control terminal of the first lighting control module 32 is electrically connected to the first lighting control signal line MIT; the first reset module 311 is electrically connected to the anode of the light emitting element 20; the control terminal of the second reset module 312 is electrically connected to the second reset control signal line S2; the control terminal of the first reset module 311 is electrically connected to the first reset control signal line S1; the input terminal of the second reset module 312 is electrically connected to the DATA signal line DATA; the input end of the first reset module 311 is electrically connected to a reset input signal line REF; the maintaining stage comprises a first stage and a second stage which are arranged at intervals periodically; in the data writing phase, the controller controls the second reset module 312 to provide the data signal to the driving module 34; controlling the first reset module 311 to provide a reset signal to the anode of the light emitting element 20; in each first phase, the first light emitting control module 32 is turned on, the first reset module 311 and the second reset module 312 are turned off, and the driving module 34 drives the light emitting element 20 to emit light; in each second phase, the first reset module 311 is turned off, the second reset module 312 and the first light emitting control module 32 are turned on, and the second reset module 312 provides a reset signal to the anode of the light emitting element 20.
Wherein the first emission control signal line MIT is configured to transmit a first emission control signal Emit; the second reset control signal line S2 is for transmitting a second reset control signal S21; the first reset control signal line S1 is used to transmit a first reset control signal S11; the DATA signal line DATA is used for transmitting a DATA signal Vdata in a DATA writing stage and transmitting a reset signal Vref in a holding stage; the reset input signal line REF is used to transmit a reset signal Vref.
Specifically, in the data writing phase, the second reset control signal S21 transmitted by the second reset control signal line S2 controls the second reset module 312 to be turned on and the first reset control signal S11 transmitted by the first reset control signal line S1 controls the first reset module 311 to be turned on, the first emission control signal Emit transmitted by the first emission control signal line MIT controls the first emission control module 32 to be turned off, and the data signal Vdata transmitted by the data signal line can be applied to the third node N3 to generate the driving current for driving the light emitting element 20 because the second reset module 312 is turned on; while the first reset module 311 is turned on to supply the reset signal Vref to the anode of the light emitting element 20 through the first reset module 311. In each of the first phases of the holding phases, the first emission control signal Emit transmitted by the first emission control signal line MIT controls the first emission control module 32 to be turned on, the first reset control signal S11 transmitted by the first reset control signal line S1 controls the first reset module 311 to be turned off, the second reset control signal S21 transmitted by the second reset control signal line S2 controls the second reset module 312 to be turned off, and the driving module 34 drives the light emitting element 20 to Emit light; in each of the second stages in the holding stage, the first reset control signal S11 transmitted by the first reset control signal line S1 controls the first reset module 311 to be turned off, the second reset control signal S21 transmitted by the second reset control signal line S2 controls the second reset module 312 to be turned on, and the first emission control signal Emit transmitted by the first emission control signal line MIT controls the first emission control module 32 to be turned on, since the input terminal of the second reset module 312 is electrically connected to the DATA signal line DATA, and the DATA signal line DATA transmits the reset signal Vref in the holding stage, so that the second reset module 312 supplies the reset signal to the anode of the light emitting element 20 to supply the reset signal Vref to the anode of the light emitting element 20 in each of the second stages in the holding stage, so that the light emitting element 20 assumes an alternate change of a bright state and a dark state in the holding stage, that the change frequency of the bright state and the dark state of the light emitting element 20 in the frame driving period is increased, the problem that human eyes perceive flicker due to continuous reduction of brightness of the light-emitting element 20 in a bright state in the holding stage caused by leakage current is avoided.
Optionally, with continued reference to fig. 19, the driving circuit 30 further includes a storage module 36, a threshold compensation module 38, and a second lighting control module 35; the first end of the storage module 36 and the control end of the driving module 34 are electrically connected to the second node N2; a second end of the memory module 36 is electrically connected to the anode of the light emitting element 20; the control end of the threshold compensation module 38 is electrically connected with the control end of the first reset module 311; the first end of the threshold compensation module 38 and the second lighting control module 35 are electrically connected to the driving module 34 at a first node N1; a second terminal of the threshold compensation module 38 is electrically connected to a second node N2; the control end of the second light emission control module 35 is electrically connected to the second light emission control signal line; the second light emission control module 35 is electrically connected to the first power signal line.
Wherein the first power signal line PVDD is used for transmitting a first power signal VPVDD(ii) a The second light-emission control signal line MIT0 is for transmitting a second light-emission control signal Emit 0.
In particular, during the data writing phase, the storage module 36 is used to store the data signals transmitted to the driving module 34. Since the threshold compensation module 38 is turned on, the data voltage Vdata applied to the third node N3 is applied to the second node N2 through the first node N1, and thus, the threshold voltage of the driving module 34 is compensated.
In the following, taking the driving circuit 30 as 6T1C (7 transistors and 1 storage capacitor), and taking the transistors as N-type transistors as examples, that is, the first reset module 311 includes the first transistor M1, the first light-emitting control module 32 includes the second transistor M2, the driving module 34 includes the fourth transistor M4, the second light-emitting control module 35 includes the fifth transistor M5, the second reset module 37 includes the sixth transistor M6, and the threshold compensation module 38 includes the seventh transistor M7 as examples, the operation principle of the driving circuit 30 will be specifically described, and it should be noted that fig. 20 takes the driving circuit 30 as a 6T1C (6 transistors and 1 storage capacitor) circuit as an example, but the driving circuit 30 is not limited to the arrangement of such a driving circuit as long as the driving of the pixel can be realized.
FIG. 21 is a timing diagram of the driving circuit according to the embodiment of the present invention, and the holding period T is shown in FIG. 21BComprising a first phase T arranged at periodic intervalsB1And a second stage TB2(ii) a At TAIn a period, i.e., a data writing period, the first emission control signal Emit transmitted from the first emission control signal line MIT and the second emission control signal Emit0 transmitted from the second emission control signal line are at a low level, and the first reset control signal transmitted from the first reset control signal line S1 is at a low levelThe signal S11 and the second reset control signal S21 transmitted through the second reset control signal line S2 are at a high level, the sixth transistor M6 and the seventh transistor M7 are turned on, the first transistor M1, the second transistor M2, and the fifth transistor M5 are turned off, and at this time, the data signal Vdata transmitted through the data signal line is applied to the gate of the fourth transistor M4, i.e., the second node N2, and a voltage obtained by the data signal Vdata and the threshold voltage of the fourth transistor M4 is applied to the second node N2, so that the threshold voltage of the fourth transistor M4 can be compensated. Further, the reset voltage Vref transmitted through the reset input signal line REF is applied to the anode of the light emitting element 20 through the first transistor M1 to reset the anode of the light emitting element 20, thereby reducing the influence of the voltage of the anode of the light emitting element 20 of the previous frame on the voltage of the anode of the light emitting element 20 of the next frame and improving the uniformity of display.
At TB1Time period, i.e. holding period TBThe first stage of (1), the first emission control signal Emit transmitted by the first emission control signal line MIT and the second emission control signal Emit0 transmitted by the second emission control signal line are at a high level, the first reset control signal S11 transmitted by the first reset control signal line S1 and the second reset control signal S21 transmitted by the second reset control signal line S2 are at a low level, the first transistor M1, the sixth transistor M6 and the seventh transistor M7 are turned on, the second transistor M2 and the fifth transistor M5 are turned on, at this time, since the data signal Vdata has been applied to the gate of the fourth transistor M4, i.e., the second node N2, and the reset voltage Vref has reset the anode of the light emitting element 20 through the first transistor M1, and therefore, the driving current corresponding to the data signal Vdata flows into the light emitting element 20 through the second transistor M2, driving the light emitting element 20 to Emit light; at TB2Time period, i.e. holding period TBThe second phase of (1), the first emission control signal Emit transmitted by the first emission control signal line MIT is still maintained at a high level, the first reset control signal S11 transmitted by the first reset control signal line S1 is still maintained at a low level, the second emission control signal Emit0 transmitted by the second emission control signal line is changed from a high level to a low level, the second reset control signal S21 transmitted by the second reset control signal line S2 is changed from a low level to a high level,at this time, the sixth transistor M6 and the seventh transistor M7 are turned on, the first transistor M1, the second transistor M2 and the fifth transistor M5 are turned off, and when the sixth transistor M6 and the seventh transistor M7 are turned on, the reset signal Vref transmitted by the data signal line can be supplied to the anode of the light emitting element 20 through the sixth transistor M6 and the seventh transistor M7, so that the light emitting element 20 is caused to exhibit an alternating change of a bright state and a dark state in the holding stage, that is, the frequency of the change of the bright state and the dark state of the light emitting element 20 in the frame driving period is increased, and the problem that the luminance of the light emitting element 20 in the bright state in the holding stage continuously decreases due to leakage current, and flicker is perceived by human eyes is avoided. In addition, at this stage, since the voltage value of the reset signal Vref gradually increases, the brightness of the light emitting element 20 in the dark state (the reset module 311 supplies the reset signal to the anode of the light emitting element 20) increases, that is, since the brightness of each bright state of the light emitting element 20 gradually decreases and the brightness of the dark state gradually increases in each frame driving period, the brightness of the light emitting element perceived by human eyes hardly changes in each frame driving period, and the problem that the human eyes can perceive the display panel to flicker is prevented.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (19)

1. A driving method of a display device, wherein the display device includes a plurality of pixels arranged in an array; the pixel includes a light emitting element and a driving circuit; the method comprises the following steps:
s1, providing a reset signal to the anode of the light emitting element in the data writing phase of each frame driving period;
s2, providing a reset signal to the anode of the light emitting element at least once in the holding phase of each frame driving period;
in each frame driving period, the voltage value of the reset signal is gradually increased, and the brightness of the light-emitting element in a dark state is gradually increased;
in the driving period per frame, a duration of supplying a reset signal to the anode of the light emitting element is gradually increased.
2. The driving method according to claim 1, wherein the driving circuit includes a reset module electrically connected to an anode of the light emitting element, the method comprising:
s1, in the data writing phase of each frame driving period, the reset module provides a reset signal to the anode of the light emitting element;
s2, the reset module provides a reset signal to the anode of the light emitting element at least once during the hold phase of each frame driving period.
3. The driving method according to claim 1, wherein a voltage value of the reset signal is linearly increased in each frame driving period.
4. The driving method according to claim 2, further comprising, before step S1:
acquiring the brightness descending slope of the pixel in the frame driving period;
determining a brightness falling slope of the pixel as a slope at which a voltage value of the reset signal linearly increases.
5. The driving method according to claim 1, wherein the voltage value of the reset signal is increased stepwise in each frame driving period.
6. The driving method according to claim 5, wherein the voltage value of the reset signal is increased in a stepwise arithmetic progression in each frame driving period.
7. The driving method according to claim 2, wherein the driving circuit further includes a first light emission control module;
the first light emitting control module is electrically connected with an anode of the light emitting element; the control end of the first light-emitting control module is electrically connected with the first light-emitting control signal wire; the control end of the reset module is electrically connected with the first reset control signal line; the input end of the reset module is electrically connected with a reset input signal line;
the maintaining stage comprises a first stage and a second stage which are arranged at intervals periodically;
in the data writing phase and each second phase, the first light-emitting control module is turned off, the reset module is turned on, and the reset module provides a reset signal to the anode of the light-emitting element;
in each of the first phases, the first light emitting control module is turned on, and the reset module is turned off.
8. The driving method according to claim 7, wherein the driving circuit further includes a data writing module, a driving module, a second light emission control module, a storage module, and an initialization module;
the initialization module and the driving module are electrically connected to a first node; the driving module, the data writing module and the second light-emitting control module are electrically connected to a second node; the driving module and the first light-emitting control module are electrically connected to a third node; the data writing module is electrically connected with the data signal line; the second light-emitting control module is electrically connected with the first power signal wire; a first end of the memory module is electrically connected with the first power signal line; the second end of the memory module is electrically connected with the first node; the input end of the initialization module is electrically connected with an initialization signal line; the control end of the second light-emitting control module is electrically connected with a second light-emitting control signal wire; in a data writing phase of each frame of driving period, the data writing module provides a data signal to the driving module, and the initialization module provides an initialization signal to the first node.
9. The driving method according to claim 8, wherein the first light emission control signal line is multiplexed into the second light emission control signal line; the reset input signal line is multiplexed as the initialization signal line.
10. The driving method according to claim 7, wherein an effective reset control pulse of the first reset control signal line does not overlap with an effective light emission control pulse of the first light emission control signal line.
11. The driving method according to claim 2, wherein the reset module includes a first reset module and a second reset module; the driving circuit further comprises a driving module and a first light emitting control module;
the first light-emitting control module and the second reset module are electrically connected with the driving module at a third node; the first light emitting control module is electrically connected with an anode of the light emitting element; the control end of the first light-emitting control module is electrically connected with the first light-emitting control signal wire; the first reset module is electrically connected with the anode of the light-emitting element; the control end of the second reset module is electrically connected with a second reset control signal line; the control end of the first reset module is electrically connected with a first reset control signal line; the input end of the second reset module is electrically connected with the data signal line; the input end of the first reset module is electrically connected with a reset input signal line;
the maintaining stage comprises a first stage and a second stage which are arranged at intervals periodically;
in the data writing phase, the second reset module provides a data signal to the driving module; the first reset module provides a reset signal to an anode of the light-emitting element;
in each first stage, the first light-emitting control module is switched on, the first reset module and the second reset module are switched off, and the driving module drives the light-emitting element to emit light;
in each second phase, the first reset module is turned off, the second reset module and the first light emitting control module are turned on, and the second reset module provides a reset signal to the anode of the light emitting element.
12. The driving method according to claim 11, wherein the driving circuit further includes a storage module, a threshold compensation module, and a second light emission control module;
the first end of the storage module and the control end of the driving module are electrically connected to a second node; the second end of the storage module is electrically connected with the anode of the light-emitting element; the control end of the threshold compensation module is electrically connected with the control end of the first reset module; the first end of the threshold compensation module and the second light emitting control module are electrically connected with the driving module at a first node; a second end of the threshold compensation module is electrically connected with the second node; the control end of the second light-emitting control module is electrically connected with a second light-emitting control signal wire; the second light emitting control module is electrically connected with the first power signal wire.
13. The driving method according to claim 2, further comprising:
judging a driving mode of the display device; executing steps S1 and S2 when the driving mode is a low frequency driving mode;
when the driving mode is the high frequency driving mode, executing step S3:
s3, in the data writing phase of each frame driving period, the reset module provides a reset signal to the anode of the light emitting element; during the hold phase of each frame drive period, the reset module is turned off.
14. The driving method according to claim 13, wherein determining the driving mode of the display device comprises:
and if the frame refreshing frequency of the display device is less than or equal to 15HZ, determining the display device to be in a low-frequency driving mode, otherwise, determining the display device to be in a high-frequency driving mode.
15. A display device is characterized by comprising a plurality of pixels arranged in an array; the pixel includes a light emitting element and a driving circuit; the driving circuit comprises a reset module; the reset module is electrically connected with the anode of the light-emitting element;
the display device further comprises a controller; the controller is used for controlling the reset module to provide a reset signal to the anode of the light-emitting element in a data writing phase of each frame driving period; controlling the reset module to provide a reset signal to the anode of the light emitting element at least once in a holding phase of each frame driving period;
in each frame driving period, the voltage value of the reset signal is gradually increased, and the brightness of the light-emitting element in a dark state is gradually increased;
in the driving period per frame, a duration of supplying a reset signal to the anode of the light emitting element is gradually increased.
16. The display device according to claim 15, wherein the driving circuit further comprises a first light emission control module;
the first light emitting control module is electrically connected with an anode of the light emitting element; the control end of the first light-emitting control module is electrically connected with the first light-emitting control signal wire; the control end of the reset module is electrically connected with the first reset control signal line; the input end of the reset module is electrically connected with a reset input signal line;
the maintaining stage comprises a first stage and a second stage which are arranged at intervals periodically;
in the data writing phase and each second phase, the first light-emitting control module is turned off, the reset module is turned on, and the reset module provides a reset signal to the anode of the light-emitting element;
in each of the first phases, the first light emitting control module is turned on, and the reset module is turned off.
17. The display device according to claim 16, wherein the driving circuit further comprises a data writing module, a driving module, a second light emission control module, a storage module, and an initialization module;
the initialization module and the driving module are electrically connected to a first node; the driving module, the data writing module and the second light-emitting control module are electrically connected to a second node; the driving module and the first light-emitting control module are electrically connected to a third node; the driving module is electrically connected with the data signal line; the second light-emitting control module is electrically connected with the first power signal wire; a first end of the memory module is electrically connected with the first power signal line; the second end of the memory module is electrically connected with the first node; the input end of the initialization module is electrically connected with an initialization signal line; the control end of the second light-emitting control module is electrically connected with a second light-emitting control signal wire;
and in the data writing stage of each frame of driving period, the controller controls the data writing module to provide a data signal to the driving module and controls the initialization module to provide an initialization signal to the first node.
18. The display device according to claim 15, wherein the reset module comprises a first reset module and a second reset module; the driving circuit further comprises a driving module and a first light emitting control module;
the first light-emitting control module and the second reset module are electrically connected with the driving module at a third node; the first light emitting control module is electrically connected with an anode of the light emitting element; the control end of the first light-emitting control module is electrically connected with the first light-emitting control signal wire; the first reset module is electrically connected with the anode of the light-emitting element; the control end of the second reset module is electrically connected with a second reset control signal line; the control end of the first reset module is electrically connected with a first reset control signal line; the input end of the second reset module is electrically connected with the data signal line; the input end of the first reset module is electrically connected with a reset input signal line;
the maintaining stage comprises a first stage and a second stage which are arranged at intervals periodically;
in the data writing phase, the controller controls the second reset module to provide a data signal to the driving module; controlling the first reset module to provide a reset signal to the anode of the light-emitting element;
in each first stage, the first light-emitting control module is switched on, the first reset module and the second reset module are switched off, and the driving module drives the light-emitting element to emit light;
in each second phase, the first reset module is turned off, the second reset module and the first light emitting control module are turned on, and the second reset module provides a reset signal to the anode of the light emitting element.
19. The display device according to claim 18, wherein the driving circuit further comprises a storage module, a threshold compensation module, and a second light emission control module;
the first end of the storage module and the control end of the driving module are electrically connected to a second node; the second end of the storage module is electrically connected with the anode of the light-emitting element; the control end of the threshold compensation module is electrically connected with the control end of the first reset module; the first end of the threshold compensation module and the second light emitting control module are electrically connected with the driving module at a first node; a second end of the threshold compensation module is electrically connected with the second node; the control end of the second light-emitting control module is electrically connected with a second light-emitting control signal wire; the second light emitting control module is electrically connected with the first power signal wire.
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