CN113380193A - Driving method, pixel driving circuit and display device - Google Patents
Driving method, pixel driving circuit and display device Download PDFInfo
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- CN113380193A CN113380193A CN202110698738.XA CN202110698738A CN113380193A CN 113380193 A CN113380193 A CN 113380193A CN 202110698738 A CN202110698738 A CN 202110698738A CN 113380193 A CN113380193 A CN 113380193A
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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- Control Of El Displays (AREA)
Abstract
The embodiment of the invention relates to the technical field of display, and discloses a driving method which is applied to a pixel driving circuit; the driving method comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency; in the first frequency driving mode, the data signal of the pixel driving circuit includes: a write phase and a hold phase; in the holding phase, the light emitting control signal of the control signal terminal of the pixel driving circuit includes a plurality of high level pulse signals. According to the driving method, the pixel driving circuit and the display device, bright and dark flickers of a display screen in a low-frequency refreshing display application scene are avoided, and therefore the use experience of a user is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a driving method, a pixel driving circuit and a display device.
Background
An OLED (Organic Light-Emitting Diode) display device has many advantages of self-luminescence, high contrast ratio, and the like, and is a display device with a wide application prospect.
The working period of the OLED display device is divided into a writing stage (namely a driving voltage refreshing writing stage) and a maintaining stage (namely an interval for converting driving voltage into OLED current to emit light); in the writing-in stage, the light-emitting control signal EM can close the display circuit, so that the OLED display device is in a non-light-emitting state; in the hold phase, the emission control signal EM turns on the display circuit to make the OLED display device in an emission state.
When the application scene is displayed in a high-frequency refreshing manner, the brightness change of the screen is not easy to be perceived by human eyes due to the short turn-off interval and the high flicker frequency of the light-emitting control signal; however, in the low-frequency refreshing display application scene, if the frequency of the light-emitting control signal is low, the brightness change of the screen is easily captured by human eyes, and the display screen is easily flickering, so that the use experience of a user is not high.
Disclosure of Invention
The embodiment of the invention aims to provide a driving method, a pixel driving circuit and a display device, which can avoid the phenomenon that a display screen has bright and dark flickering feeling under the application scene of low-frequency refreshing display, thereby improving the use experience of a user.
To solve the above technical problem, an embodiment of the present invention provides a driving method applied to a pixel driving circuit; the driving method comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency; in the first frequency driving mode, the data signal of the pixel driving circuit includes: a write phase and a hold phase; in the holding phase, the light emitting control signal of the control signal terminal of the pixel driving circuit includes a plurality of high level pulse signals.
In addition, the time of each of the plurality of high-level pulse signals is the same, and the time of each of the high-level pulse signals is the same as the time of a single high-level pulse signal of the light emission control signal in the writing phase.
In addition, in the first frequency driving mode, the frequency of the light emission control signal is not less than 60 hz.
In addition, in the first frequency driving mode, when the first frequency is 10hz, the light emission control signal includes at least 5 high-level pulse signals in the hold phase.
Additionally, the write phase includes: an initialization phase and a capacitive charging phase of the pixel driving circuit.
An embodiment of the present invention further provides a pixel driving circuit, including;
a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, a capacitor and an organic light emitting diode, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor and the seventh transistor respectively have a control end, a first end and a second end;
wherein a control terminal of the first transistor is coupled to one terminal of the capacitor, a first terminal of the third transistor and a first terminal of the fourth transistor, the first terminal of the first transistor is coupled to a second terminal of the second transistor and a first terminal of the fifth transistor, the second terminal of the first transistor is coupled to a second terminal of the third transistor and a first terminal of the sixth transistor, a control terminal of the second transistor is coupled to a control terminal of the third transistor and a local scan terminal, the first terminal of the second transistor is coupled to a data terminal, the control terminal of the fourth transistor is coupled to a previous scan terminal, the control terminal of the fifth transistor is coupled to a control terminal and a light emitting control terminal of the sixth transistor, the second terminal of the fifth transistor is coupled to the other terminal and a positive terminal of the capacitor, the second terminal of the sixth transistor is coupled to the first terminal of the seventh transistor and an anode terminal of the organic light emitting diode, a control end of the seventh transistor is coupled to the pre-stage scanning end, and a second end of the seventh transistor is coupled to a second end of the fourth transistor and the other positive end; one cathode end of the organic light emitting diode is grounded;
the pixel driving circuit comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency;
in the first frequency driving mode, the data signal provided by the data line of the pixel driving circuit comprises: a write phase and a hold phase;
in the hold phase, the light emission control signal is configured to include a plurality of high-level pulse signals.
In addition, the time of each of the plurality of high-level pulse signals is the same, and the time of each of the high-level pulse signals is the same as the time of a single high-level pulse signal of the light emission control signal in the writing phase.
In addition, in the first frequency driving mode, the frequency of the light emission control signal is configured to be not less than 60 hz.
In addition, in the first frequency driving mode, when the first frequency is 10hz, the light emission control signal is configured to include at least 5 high-level pulse signals in the hold phase.
The embodiment of the invention provides a driving method, which is applied to a pixel driving circuit; the driving method comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency; in the first frequency driving mode, the data signal of the pixel driving circuit includes: a write phase and a hold phase; in the hold phase, the light emission control signal of the control signal terminal of the pixel driving circuit includes a plurality of high-level pulse signals.
In this embodiment, since the first frequency of the first frequency driving mode is lower than the second frequency of the second frequency driving mode, it can be understood that the screen refresh rate (i.e. the number of times that the screen is refreshed per second) is lower in the first frequency driving mode. In the low-frequency refreshing display application scene, if the light and dark changes of the screen are easily captured by human eyes when the frequency of the light-emitting control signals is low, the display screen is easy to have light and dark flickering feeling, so that a plurality of high-level pulse signals are additionally added to the light-emitting control signals EM which are originally in the maintaining stage in the low-frequency display frame picture, the display screen which is originally in the light-emitting state in the maintaining stage flickers for a plurality of times, and the flickering frequency of the display screen is improved. Since the higher the flicker frequency of the screen is, the less easily the brightness change of the screen is perceived by human eyes, the improvement in the present embodiment can visually reduce the brightness change of the screen, reduce the brightness flicker of the display screen, and thereby improve the user experience.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a timing diagram according to the prior art;
FIG. 2 is a timing diagram according to the first embodiment of the present invention;
FIG. 3 is a graph of the luminance curve and the frequency spectrum of the display controlled by the pixel driving circuit according to the timing chart shown in FIG. 1 when the screen refresh frequency is 10hz according to the prior art;
FIG. 4 is a graph of the luminance curve and the frequency spectrum of the pixel driving circuit according to the first embodiment of the present invention, wherein the refresh frequency of the 10hz screen is set and 5 high-level pulse signals are inserted into the light-emitting control signal during the hold period;
fig. 5 is a schematic structural diagram of a pixel driving circuit according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the present invention relates to a driving method, and the core of the present embodiment lies in being applied to a pixel driving circuit; the driving method comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency; in the first frequency driving mode, the data signal of the pixel driving circuit includes: a write phase and a hold phase; in the hold phase, the light emission control signal of the control signal terminal of the pixel driving circuit includes a plurality of high-level pulse signals.
In this embodiment, since the first frequency of the first frequency driving mode is lower than the second frequency of the second frequency driving mode, it can be understood that the screen refresh rate (i.e. the number of times that the screen is refreshed per second of frame) is lower in the first frequency driving mode. In the low-frequency refreshing display application scene, if the light and dark changes of the screen are easily captured by human eyes when the frequency of the light-emitting control signals is low, the display screen is easy to have light and dark flickering feeling, so that a plurality of high-level pulse signals are additionally added to the light-emitting control signals which are originally in the maintaining stage in the low-frequency display frame picture, the display screen which is originally in the light-emitting state in the maintaining stage flickers for a plurality of times, and the flickering frequency of the display screen is improved. Since the higher the flicker frequency of the screen is, the less easily the brightness change of the screen is perceived by human eyes, the improvement in the present embodiment can visually reduce the brightness change of the screen, reduce the brightness flicker of the display screen, and thereby improve the user experience.
The following describes the implementation details of the driving method of the present embodiment in detail, and the following is only provided for the convenience of understanding and is not necessary for implementing the present embodiment.
The driving method includes a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency. The first frequency and the second frequency as referred to herein refer to the refresh frequency of the display screen, i.e., the number of times the screen is refreshed per second of frame. Because the first frequency is less than the second frequency, the first frequency driving mode can be understood as a low-frequency driving mode, and at this time, the display screen is in a low-frequency refreshing application scene; the second frequency driving mode may be understood as a high frequency driving mode when the display screen is in a high frequency refresh application scenario. In practical applications, when the display content of the display screen needs to be refreshed quickly, the display screen is generally in a high-frequency refresh application scenario to implement quick refreshing of the display content of the display screen, for example: and the display screen is in a high-frequency refreshing application scene in the game scene, namely in a second frequency driving mode. When the display content of the display screen does not need to be refreshed quickly, the display screen is generally in a low-frequency refresh application scenario to reduce switching loss and save power, for example: the display screen is in a low-frequency refreshing application scene in a reading scene, namely in a first frequency driving mode.
In the first frequency driving mode, i.e. the low frequency refresh application scenario, the timing diagram of the pixel driving circuit in the related art is shown in fig. 1: one of the refresh frequency cycles corresponds to a writing phase (i.e. a phase of refreshing and writing the driving voltage) and a holding phase (i.e. an interval of converting the driving voltage into the OLED current for emitting light) of the data signal.
The write phase is referred to as the "Vdata interval" shown in FIG. 1. In the writing stage, each data signal line outputs different voltage signals to write different data signals into the capacitors of the pixel driving circuits corresponding to different OLED devices. In the writing stage, the emission control signal EM pulse turns off the display circuit, so that the OLED display device is in a non-emission state. It should be noted that the emission control signal EM pulse may include one or more high-level pulse signals during the writing period according to the structure and driving principle of the pixel driving circuit. In this embodiment, the writing-stage emission control signal EM pulse shown in fig. 1 includes 1 high-level pulse signal, which is only for illustration and should not be limited to that shown in the drawings. In this embodiment, the write phase includes: an initialization phase and a capacitance charging phase of the pixel driving circuit.
The hold phase is referred to as the "hold frame interval" shown in fig. 1. In the holding phase, the voltage signal written into the capacitor in the writing phase is held at the grid of the driving transistor, and the OLED device of the pixel driving circuit is driven to emit light for display. In the hold phase, each data signal line may be switched in a stable high level signal or a stable low level signal, and at this time, the emission control signal EM pulse is maintained at the low level to keep the OLED device stably emitting light for displaying. In fig. 1 of the present embodiment, one stable high level signal Vskip is applied to each data signal line in the hold stage, which is only for illustration and should not be limited to that shown in the drawing.
In the writing stage, the emission control signal EM pulse turns off the display circuit, so that the OLED display device is in a non-emission state, and in the holding stage, the emission control signal EM pulse is maintained at a low level to keep the OLED device emitting light stably for display. Therefore, in the low-frequency refreshing display application scene, if the frequency of the light-emitting control signal is low, the brightness change of the screen is easily captured by human eyes, and the display screen is easy to generate a brightness flicker feeling, so that the use experience of a user is not high.
In view of this, the inventor found that, since human eyes have different flicker sensitivity responses to different frequencies, the higher the flicker frequency of the screen, the less noticeable the change in brightness of the screen is to human eyes. Therefore, in this embodiment, a plurality of high-level pulse signals are additionally added to the emission control signal EM pulse in the hold stage in the original low-frequency display of one frame of picture, as shown in fig. 2, 3 high-level pulse signals are added to the emission control signal EM pulse in the hold stage, so that the display screen which is originally always in the emission state in the hold stage flickers for a plurality of times, and the flicker frequency of the display screen is improved. In this way, the present embodiment can visually reduce the degree of change in brightness of the screen, reduce the flickering sensation of the display screen, and improve the user experience. It should be noted that, except that the diagram of the emission control signal EM pulse in the hold phase in fig. 2 is different from that in fig. 1, the rest of fig. 2 is the same as that shown in fig. 1, and reference may be made to the description in fig. 1, and the description is not repeated here. And the number of the high-level pulse signals shown in fig. 2, which are increased in the emission control signal EM pulse in the hold phase, is only for convenience of illustration and is not limited to that shown in the drawing.
Alternatively, the time of each of the plurality of high-level pulse signals is the same, and the time of each of the high-level pulse signals is the same as the time of a single high-level pulse signal of the light emission control signal in the writing phase.
Alternatively, in the first frequency driving mode, the frequency of the light emission control signal is not less than 60 hz. Since the human eye is insensitive to the flicker response with a higher frequency (about 60hz or more), in this embodiment, after the light emission control signal EM pulse in the hold phase is increased by a plurality of high-level pulse signals, the frequency of the obtained light emission control signal EM pulse is not less than 60hz, so as to ensure that the flicker frequency of the screen is not less than 60hz, and thus, the user can hardly catch the change of brightness of the screen visually, and the use experience of the user is further improved.
In the first frequency driving mode, when the first frequency is 10hz, the light-emitting control signal at least comprises 5 high-level pulse signals in the holding period. In this way, no matter whether the emission control signal EM pulse during the writing phase includes one or more high level pulse signals, after the emission control signal EM pulse during the holding phase is increased by at least 5 high level pulse signals, the frequency of the emission control signal EM pulse is inevitably not less than 60hz, so as to ensure that the flicker frequency of the screen is not less than 60 hz.
FIG. 3 is a graph showing a luminance curve and a frequency spectrum of a display controlled by the pixel driving circuit according to the timing chart shown in FIG. 1 when the screen refresh frequency is 10hz in the prior art; fig. 4 shows that when the screen refresh frequency is 10hz, 5 high-level pulse signals are inserted into the light-emitting control signal in the hold phase, and the time of each high-level pulse signal is the same as the time of a single high-level pulse signal of the light-emitting control signal in the write phase, so as to control the luminance curve and the spectrum curve displayed by the pixel driving circuit. As can be seen from fig. 3 and 4, the spectral diagram of fig. 4 has fewer low-frequency flicker components less than 50hz, and the human eye flicker perception is significantly improved.
Compared with the related art, the embodiment of the invention provides a driving method, and since the first frequency of the first frequency driving mode is lower than the second frequency of the second frequency driving mode, it can be understood that the screen refresh rate (i.e. the number of times that the screen is refreshed per second) is lower when in the first frequency driving mode. In the low-frequency refreshing display application scene, if the light and dark changes of the screen are easily captured by human eyes when the frequency of the light-emitting control signals is low, the display screen is easy to have light and dark flickering feeling, so that a plurality of high-level pulse signals are additionally added to the light-emitting control signals EM which are originally in the maintaining stage in the low-frequency display frame picture, the display screen which is originally in the light-emitting state in the maintaining stage flickers for a plurality of times, and the flickering frequency of the display screen is improved. Since the higher the flicker frequency of the screen is, the less easily the brightness change of the screen is perceived by human eyes, the improvement in the present embodiment can visually reduce the brightness change of the screen, reduce the brightness flicker of the display screen, and thereby improve the user experience.
A second embodiment of the present invention relates to a pixel drive circuit, as shown in fig. 5, including: a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, a capacitor C1 and an organic light emitting diode D, wherein the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6 and the seventh transistor T7 respectively have a control terminal, a first terminal and a second terminal, for example: the control terminal may be a gate of the thin film transistor, and the first terminal and the second terminal may be one of a source and a drain of the thin film transistor.
Wherein a control terminal of the first transistor T1 is coupled to one terminal of the capacitor C1, a first terminal of the third transistor T3 and a first terminal of the fourth transistor T4, a first terminal of the first transistor T1 is coupled to a second terminal of the second transistor T2 and a first terminal of the fifth transistor T5, a second terminal of the first transistor T1 is coupled to a second terminal of the third transistor T3 and a first terminal of the sixth transistor T6, a control terminal of the second transistor T2 is coupled to a control terminal of the third transistor T3 and a local stage (nth stage) Scan terminal, for example, n may be a positive integer for representing one of cascaded multi-stage signals, the local stage (nth stage) Scan terminal is used for inputting a Scan [ n ] signal, the first terminal of the second transistor T2 is coupled to a data terminal, the data terminal is used for inputting a Vdata signal, and the control terminal of the fourth transistor T4 is coupled to a previous stage (nth-1) Scan terminal, the pre-stage (n-1 stage) Scan terminal is configured to input Scan [ n-1] signal, the control terminal of the fifth transistor T5 is coupled to the control terminal of the sixth transistor T6 and a light emission control terminal EM, the light emission control terminal is configured to input a light emission control signal, the second terminal of the fifth transistor T5 is coupled to the other terminal of the capacitor C1 and a positive terminal Vdd, the positive terminal is configured to input a Vdd signal, the second terminal of the sixth transistor T6 is coupled to the first terminal of the seventh transistor T7 and an anode terminal of the organic light emitting diode D, the control terminal of the seventh transistor T7 is coupled to the pre-stage (n-1 stage) Scan terminal, and the second terminal of the seventh transistor T7 is coupled to the second terminal of the fourth transistor T4 and another positive terminal Vi; and a cathode end of the organic light emitting diode D is grounded.
The driving transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 shown in fig. 5 may be N-type thin film transistors or P-type thin film transistors. The source and drain of the transistor may be interchanged depending on the type of transistor used.
The pixel driving circuit comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency; in the first frequency driving mode, the data signal provided by the data line of the pixel driving circuit comprises: a write phase and a hold phase; in the hold phase, the light emission control signal is configured to include a plurality of high-level pulse signals.
Since the first frequency of the first frequency driving mode is lower than the second frequency of the second frequency driving mode, it can be understood that the screen refresh rate (i.e. the number of times that the screen is refreshed every second frame) is lower in the first frequency driving mode. In the low-frequency refreshing display application scene, if the light and dark changes of the screen are easily captured by human eyes when the frequency of the light-emitting control signals is low, the display screen is easy to have light and dark flickering feeling, so that a plurality of high-level pulse signals are additionally added to the light-emitting control signals which are originally in the maintaining stage in the low-frequency display frame picture, the display screen which is originally in the light-emitting state in the maintaining stage flickers for a plurality of times, and the flickering frequency of the display screen is improved. Since the higher the flicker frequency of the screen is, the less easily the brightness change of the screen is perceived by human eyes, the improvement in the present embodiment can visually reduce the brightness change of the screen, reduce the brightness flicker of the display screen, and thereby improve the user experience.
Since this embodiment is a pixel driving circuit embodiment corresponding to the driving method, implementation details in the driving method embodiment can be applied to this embodiment, and implementation details of the pixel driving circuit structure in this embodiment can also be applied to the driving method embodiment, which is not described herein again.
Alternatively, the time of each of the plurality of high-level pulse signals is the same, and the time of each of the high-level pulse signals is the same as the time of a single high-level pulse signal of the light emission control signal in the writing phase.
Alternatively, in the first frequency driving mode, the frequency of the light emission control signal is not less than 60 hz. Since the human eye is insensitive to the flicker response with a higher frequency (about 60hz or more), in this embodiment, after the light emission control signal EM pulse in the hold phase is increased by a plurality of high-level pulse signals, the frequency of the obtained light emission control signal EM pulse is not less than 60hz, so as to ensure that the flicker frequency of the screen is not less than 60hz, and thus, the user can hardly catch the change of brightness of the screen visually, and the use experience of the user is further improved.
In the first frequency driving mode, when the first frequency is 10hz, the light-emitting control signal at least comprises 5 high-level pulse signals in the holding period. In this way, no matter whether the emission control signal EM pulse during the writing phase includes one or more high level pulse signals, after the emission control signal EM pulse during the holding phase is increased by at least 5 high level pulse signals, the frequency of the emission control signal EM pulse is inevitably not less than 60hz, so as to ensure that the flicker frequency of the screen is not less than 60 hz.
A third embodiment of the present invention relates to a display device including the pixel drive circuit in the above embodiments. In this embodiment, the display device may be a mobile phone, a computer, a television, a vehicle-mounted display device, or other display devices with display functions, such as a wearable device.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A driving method is applied to a pixel driving circuit;
the driving method comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency;
in the first frequency driving mode, the data signal of the pixel driving circuit includes: a write phase and a hold phase;
in the holding phase, the light emitting control signal of the control signal terminal of the pixel driving circuit includes a plurality of high level pulse signals.
2. The driving method according to claim 1, wherein the time of each of the plurality of high-level pulse signals is the same, and the time of each of the high-level pulse signals is the same as the time of a single high-level pulse signal of the emission control signal in the writing phase.
3. The driving method according to claim 2, wherein in the first frequency driving mode, the frequency of the light emission control signal is not less than 60 hz.
4. The driving method according to claim 2 or 3, wherein in the first frequency driving mode, when the first frequency is 10Hz, the light emission control signal comprises at least 5 high-level pulse signals in the hold phase.
5. The driving method according to claim 1, wherein the writing phase comprises: an initialization phase and a capacitive charging phase of the pixel driving circuit.
6. A pixel driving circuit, comprising;
a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, a capacitor and an organic light emitting diode, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor and the seventh transistor respectively have a control end, a first end and a second end;
wherein a control terminal of the first transistor is coupled to one terminal of the capacitor, a first terminal of the third transistor and a first terminal of the fourth transistor, the first terminal of the first transistor is coupled to a second terminal of the second transistor and a first terminal of the fifth transistor, the second terminal of the first transistor is coupled to a second terminal of the third transistor and a first terminal of the sixth transistor, a control terminal of the second transistor is coupled to a control terminal of the third transistor and a local scan terminal, the first terminal of the second transistor is coupled to a data terminal, the control terminal of the fourth transistor is coupled to a previous scan terminal, the control terminal of the fifth transistor is coupled to a control terminal and a light emitting control terminal of the sixth transistor, the second terminal of the fifth transistor is coupled to the other terminal and a positive terminal of the capacitor, the second terminal of the sixth transistor is coupled to the first terminal of the seventh transistor and an anode terminal of the organic light emitting diode, a control end of the seventh transistor is coupled to the pre-stage scanning end, and a second end of the seventh transistor is coupled to a second end of the fourth transistor and the other positive end; one cathode end of the organic light emitting diode is grounded;
the pixel driving circuit comprises a first frequency driving mode and a second frequency driving mode, wherein the first frequency is less than the second frequency;
in the first frequency driving mode, the data signal provided by the data line of the pixel driving circuit comprises: a write phase and a hold phase;
in the hold phase, the light emission control signal is configured to include a plurality of high-level pulse signals.
7. The pixel driving circuit according to claim 6, wherein the time of each of the plurality of high-level pulse signals is the same, and the time of each of the high-level pulse signals is the same as the time of a single high-level pulse signal of the emission control signal in the writing phase.
8. The pixel driving circuit according to claim 7, wherein a frequency of the light emission control signal is configured to be not less than 60hz in the first frequency driving mode.
9. The pixel driving circuit according to claim 7 or 8, wherein in a first frequency driving mode, when the first frequency is 10hz, in the hold phase, the light emission control signal is configured to include at least 5 high-level pulse signals.
10. A display device, comprising: a pixel drive circuit as claimed in any one of claims 6 to 9.
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