CN110782838A - Pixel driving circuit, driving method, display panel and display device - Google Patents
Pixel driving circuit, driving method, display panel and display device Download PDFInfo
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- CN110782838A CN110782838A CN201911107822.9A CN201911107822A CN110782838A CN 110782838 A CN110782838 A CN 110782838A CN 201911107822 A CN201911107822 A CN 201911107822A CN 110782838 A CN110782838 A CN 110782838A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
Abstract
The application discloses a pixel driving circuit, a driving method, a display panel and a display device. The pixel driving circuit includes: the grid electrode of the driving transistor is electrically connected with the first electrode of the first storage capacitor, and the first electrode and the second electrode are respectively electrically connected with the light-emitting control module; the light emitting control module is connected with a light emitting control signal and a first power supply voltage, and under the control of the light emitting control signal, the anode of the electroluminescent device is connected with the first power supply voltage and enables the driving transistor to be in a saturated state; the first pole of the second storage capacitor is electrically connected with the anode of the electroluminescent device, the second pole of the second storage capacitor is electrically connected with the cathode of the electroluminescent device, and the cathode of the electroluminescent device is electrically connected with a second power voltage; the first initialization module is connected with an initialization signal and an initialization voltage, and initializes the anode potential of the electroluminescent device under the control of the initialization signal, wherein the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor.
Description
Technical Field
The present disclosure relates generally to the field of display technologies, and in particular, to a pixel driving circuit, a driving method, a display panel and a display device.
Background
Nowadays, game mobile phones are gradually becoming an important entertainment mode for young people, and the game mobile phones need to have a display panel with a higher refreshing frequency. As the refresh frequency increases, the charging time and the reset time of the display panel may decrease.
The OLED (Organic Light-Emitting Diode) display panel has the advantages of wide color gamut, high contrast, energy saving, foldability and the like, and is widely applied to mobile phone screens. The working state of a Gate On Array (GOA) circuit of the Array substrate has a very important influence On the display quality of the display panel.
The GOA driving circuit uses the array substrate process of the display device to make the line (Gate) scanning driving signal circuit on the array substrate to realize the line-by-line driving scanning of the pixel units. The GOA circuit is formed by cascading a plurality of GOA units, and each GOA unit drives at least one row of pixels on the array substrate. Generally, a GOA cell includes two circuit parts independent of each other, namely a scanning part that supplies a scan signal for resetting & writing the scan signal and a light emitting part; the light emitting portion provides a light emitting signal for turning on/off the light emission of the electroluminescent device OLED.
At present, too much load is carried in a mobile phone, the reset time of a display panel is insufficient under a high refresh frequency, electric charges are remained at the anode of an OLED (organic light emitting diode) device, and sub-pixels can be stolen to be bright under a low gray scale, so that the display panel is not dark enough in a dark working stage, and the display effect is influenced.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a pixel driving circuit, a driving method, a display panel and a display device.
In a first aspect, the present invention provides a pixel driving circuit, comprising: a driving transistor, a first storage capacitor, a second storage capacitor, a first initialization module, and a light emission control module,
the grid electrode of the driving transistor is electrically connected with the first electrode of the first storage capacitor, and the first electrode and the second electrode of the driving transistor are respectively electrically connected with the light-emitting control module;
the light-emitting control module is connected with a light-emitting control signal and a first power voltage, and under the control of the light-emitting control signal, the anode of the electroluminescent device is connected with the first power voltage, so that the driving transistor is in a saturated state;
the first pole of the second storage capacitor is electrically connected with the anode of the electroluminescent device, the second pole of the second storage capacitor is electrically connected with the cathode of the electroluminescent device, and the cathode of the electroluminescent device is electrically connected with a second power voltage;
the first initialization module is connected with an initialization signal and an initialization voltage, and initializes the anode potential of the electroluminescent device under the control of the initialization signal, wherein the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor.
Optionally, the pixel driving circuit further includes a second initialization module, where the second initialization module is connected to the gate control signal of the previous GOA unit and the initialization voltage, and initializes the first storage capacitor under the control of the gate control signal of the previous GOA unit.
Optionally, the first initialization module includes a first initialization transistor, a gate of the first initialization transistor is connected to an initialization signal, a first pole of the first initialization transistor is electrically connected to the initialization voltage, and a second pole of the first initialization transistor is electrically connected to an anode of the electroluminescent device;
the second initialization module comprises a second initialization transistor, a gate of the second initialization transistor is connected to a gate control signal of a previous GOA unit, a first pole of the second initialization transistor is electrically connected with the initialization voltage, and a second pole of the second initialization transistor is electrically connected with a first pole of the first storage capacitor.
Optionally, the pixel driving circuit further comprises a writing and compensating module;
a first pole of the first storage capacitor is electrically connected with the grid electrode of the driving transistor, the writing and compensating module and the second initializing module, and a second pole of the first storage capacitor is electrically connected with the first power voltage;
the writing and compensating module is connected to a gate control signal and a data signal of the GOA unit, writes the data signal into a first pole of the driving transistor under the control of the gate control signal of the GOA unit, and controls a second pole of the driving transistor to be connected with the gate of the driving transistor, so that the potential of the gate of the driving transistor is set to be a compensation voltage value.
Optionally the write and compensation module comprises a write transistor and a compensation transistor;
the gate of the writing transistor is connected with a gate control signal of a GOA unit at the current stage, the first pole of the writing transistor is electrically connected with the data line, and the second pole of the writing transistor is electrically connected with the first pole of the driving transistor;
the grid electrode of the compensation transistor is connected to the grid electrode control signal of the GOA unit at the current stage, the first pole of the compensation transistor is electrically connected with the grid electrode of the driving transistor, and the second pole of the compensation transistor is electrically connected with the second pole of the driving transistor.
Optionally the lighting control module comprises a first lighting control transistor and a second lighting control transistor;
a gate of the first light-emitting control transistor is connected to the light-emitting control signal, a first pole of the first light-emitting control transistor is electrically connected to the first power voltage, and a second pole of the first light-emitting control transistor is electrically connected to the first pole of the driving transistor;
the grid electrode of the second light-emitting control transistor is connected with the light-emitting control signal, the first pole of the second light-emitting control transistor is electrically connected with the second pole of the driving transistor, and the second pole of the second light-emitting control transistor is electrically connected with the anode of the electroluminescent device.
Optionally, the initialization signal is an inverted signal of the light emission control signal; alternatively, the first and second electrodes may be,
the initialization signal is an inverted signal of a light emitting control signal of a previous GOA unit.
In a second aspect, the present invention provides a driving method of a pixel driving circuit, for driving the pixel driving circuit, the driving method including:
an initialization step: and enabling an initialization signal to be effective to enable the first initialization transistor to be conducted and initialize the anode potential of the light-emitting device, wherein the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor.
Optionally, the initializing step further includes: the gate control signal of the previous GOA unit is effective, so that the second initialization transistor is conducted, and the gate potential of the driving transistor is initialized;
after the initializing step, the driving method further includes:
writing and compensating: the gate control signal of the GOA unit of the current level is effective, the writing transistor and the compensation transistor are conducted, the data signal is written into the first pole of the driving transistor, and the gate voltage of the driving transistor is enabled to be a compensation voltage value;
a light emitting step: the light-emitting control signal is effective, the first light-emitting control transistor and the second light-emitting control transistor are conducted, the driving transistor is conducted, and the anode of the light-emitting device is connected with the second power supply signal to drive the electroluminescent device to emit light.
In a third aspect, the present invention provides a display panel including the pixel driving circuit.
In a fourth aspect, the present invention provides a display device, including the display panel.
According to the technical scheme provided by the embodiment of the application, the anode potential of the electroluminescent device is initialized through the first initialization module, the second storage capacitor is connected with the electroluminescent device in parallel, the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor, so that the anode of the electroluminescent device is completely reset before the electroluminescent device enters the light emitting control stage, the electroluminescent device is always kept in a cut-off state before the light emitting control stage, light emission cannot be stolen, sub-pixels cannot be stolen and lightened in a dark state, and the display effect of the display panel is effectively improved. In addition, according to some embodiments of the present application, gate control signals of a previous stage and a next stage of the GOA unit, and light emission control signals of the previous stage and the next stage are fully utilized to implement initialization, writing, and compensation of the pixel driving circuit, so as to obtain an effect of effectively utilizing resources.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a block diagram illustrating an exemplary structure of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is an exemplary block diagram of a pixel driving circuit according to another embodiment of the present invention;
FIG. 3 is an exemplary logic circuit diagram for outputting the initialization signal EM (N) N shown in FIG. 2;
FIG. 4 is a timing diagram illustrating exemplary operation of the pixel driving circuit shown in FIG. 2;
fig. 5 is an exemplary block diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 6 is an exemplary logic circuit diagram for outputting the initialization signal em (N) _ N shown in fig. 5;
fig. 7 is an exemplary operation timing diagram of the pixel driving circuit shown in fig. 5.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a pixel driving circuit according to an embodiment of the present invention includes: a driving transistor T2, a first storage capacitor C1, a second storage capacitor C2, a first initialization module 11, a light emitting control module 12, wherein,
a driving transistor T2 having a gate electrically connected to the first electrode of the first storage capacitor C1, and a first electrode and a second electrode electrically connected to the light-emitting control module 12, respectively;
the light emitting control module 12 is connected to the light emitting control signal EM and the first power voltage Vdd, and under the control of the light emitting control signal EM (n), the anode of the electroluminescent device OLED is connected to the first power voltage Vdd, and the driving transistor T2 is in a saturated state;
a first pole of the second storage capacitor C2 is electrically connected with the anode of the electroluminescent device OLED, a second pole of the second storage capacitor C2 is electrically connected with the cathode of the electroluminescent device OLED, and the cathode of the electroluminescent device OLED is electrically connected with a second power voltage;
the first initialization module 11 is connected to an initialization signal Re and an initialization voltage Vinit, and initializes the anode potential of the electroluminescent device OLED under the control of the initialization signal Re, wherein the effective duration of the initialization signal Re is longer than the discharge duration of the second storage capacitor C2.
In this embodiment, initializing the anode potential of the electroluminescent device OLED means pulling the voltage at the p point to the initialization voltage Vinit. The second storage capacitor C2 is connected in parallel with the electroluminescent device OLED, and the effective duration of the initialization signal Re is set to be longer than the discharge duration of the second storage capacitor C2, so that the electroluminescent device OLED is always kept in a cut-off state before entering a light-emitting control stage, light cannot be shined by stealing, sub-pixels cannot be shined by stealing in a dark state, and the display effect of the display panel is effectively improved.
Further, the pixel driving circuit further includes a second initialization module 13, where the second initialization module 13 accesses the gate control signal G (n-1) and the initialization voltage Vinit of the previous GOA unit, and initializes the first storage capacitor C1 under the control of the gate control signal G (n-1) of the previous GOA unit.
In this embodiment, initializing the first storage capacitor C1 means pulling the voltage of the first pole, i.e., the n point, of the storage capacitor C1 to the initialization voltage Vinit.
The pixel driving circuit according to the embodiment of the present invention initializes the anode potential of the electroluminescent device OLED by the first initialization module in the initialization stage, and initializes the first electrode of the first storage capacitor C1 by the second initialization module 13 in the initialization stage.
Further, the pixel driving circuit further includes a writing and compensating module 14;
a first pole of the first storage capacitor C1 is electrically connected to the gate of the driving transistor T2, the write and compensation module 14, and the second initialization module 13, and a second pole of the first storage capacitor C1 is electrically connected to the first power voltage Vdd;
the write and compensation module 14 is connected to the gate control signal g (n) and the Data signal Data of the GOA unit, and under the control of the gate control signal g (n) of the GOA unit, the Data signal Data is written into the first pole of the driving transistor T2, and the second pole of the driving transistor T2 is controlled to be connected to the gate of the driving transistor T2, so that the potential of the gate of the driving transistor T2 is set to a compensation voltage value.
In the compensation phase, the write and compensation module 14 controls the Data signal Data to be written into the first pole of the driving transistor T2, and controls the second pole of the driving transistor T2 to be connected to the gate of the driving transistor T2, so as to control the driving transistor T2 to be turned on and control the on-current of the driving transistor T2 to flow from the first pole of the driving transistor T2 to the second pole of the driving transistor T2 until the gate of the driving transistor T2 is at the potential Data + Vth; vth is the threshold voltage of the driving transistor T2.
As shown in fig. 2, the initialization signal Re shown in fig. 1 is represented as the initialization signal em (N) _ N in the pixel driving circuit provided in the embodiment shown in fig. 2.
The first initialization module 11 includes a first initialization transistor T1, a gate of the first initialization transistor T1 is connected to an initialization signal em (N) _ N, a first pole of the first initialization transistor T1 is electrically connected to an initialization voltage Vinit, and a second pole of the first initialization transistor T1 is electrically connected to an anode of the electroluminescent device;
the second initialization module 13 includes a second initialization transistor T3, a gate of the second initialization transistor T3 is connected to the gate control signal G (n-1) of the previous GOA cell, a first pole of the second initialization transistor T3 is electrically connected to the initialization voltage Vinit, and a second pole of the second initialization transistor T3 is electrically connected to the first pole of the first storage capacitor C1.
In the initialization stage, when the initialization signal em (N) _ N is valid, the first initialization transistor T1 is turned on, and the initialization voltage Vinit is connected to the point P, so as to initialize the anode potential of the electroluminescent device OLED; when the gate control signal G (n-1) of the previous stage GOA cell is asserted, the second initialization transistor T3 is turned on, and the initialization voltage Vinit is connected to the n-point, i.e., the first electrode of the first storage capacitor C1 is initialized.
Further, the write and compensation module 14 includes a write transistor T4 and a compensation transistor T5;
the gate of the write transistor T4 is connected to the gate control signal g (n) of the GOA cell of the current stage, the first pole of the write transistor T4 is electrically connected to the data line, and the second pole of the write transistor T4 is electrically connected to the first pole of the driving transistor T2;
the gate of the compensation transistor T5 is connected to the gate control signal g (n) of the GOA unit of the current stage, the first pole of the compensation transistor T5 is electrically connected to the gate of the driving transistor T2, and the second pole of the compensation transistor T5 is electrically connected to the second pole of the driving transistor T2.
In the compensation stage, when the gate control signal g (n) of the GOA unit of the current stage is asserted, the write transistor T4 is turned on, and the Data signal Data on the Data line is written to the point m; meanwhile, the compensation transistor T5 is turned on, and charges the n point until the potential at the n point is Data + Vth, and the gate-source power source Vgs of the driving transistor T2 is Vth at this time.
Further, the light emitting control module 12 includes a first light emitting control transistor T6 and a second light emitting control transistor T7;
a gate of the first light-emitting control transistor T6 is connected to a light-emitting control signal em (n), a first pole of the first light-emitting control transistor T6 is electrically connected to the first power voltage Vdd, and a second pole of the first light-emitting control transistor T6 is electrically connected to the first pole of the driving transistor T2;
the gate of the second emission control transistor T7 is connected to the emission control signal EM, the first pole of the second emission control transistor T7 is electrically connected to the second pole of the driving transistor T2, and the second pole of the second emission control transistor T7 is electrically connected to the anode of the electroluminescent device OLED.
When the emission control signal em (n) is asserted, the first emission control transistor T6 and the second emission control transistor T7 are turned on, the driving transistor T2 operates in a saturation state, and a voltage difference Vsg between the source and the gate of the driving transistor is: vsg Vm-Vn Vdd- (Data + Vth) Vdd-Data-Vth, and a driving current I
OLED＝K(Vgs-Vth)
2＝K(Vdd-Data)
2. It can be seen that Vth is compensated for, driving current I
OLEDThe Vdd is normally a predetermined value, regardless of the threshold voltage Vth of the driving transistor T2, and only for the Data signal Data. Therefore, the electroluminescent device is stable in display, and the problems of non-uniformity and instability of display brightness caused by non-uniformity of threshold voltage are effectively avoided.
Since the emission control signal em (N) is only valid in the emission control phase, the embodiment uses the inverted signal em (N) _ N of the emission control signal em (N) as the initialization signal, the initialization signal em (N) _ N is valid in the initialization phase and the scanning phase, the electroluminescent device can be completely reset at a higher refresh frequency (corresponding to a shorter refresh period), and the electroluminescent device is ensured to be in a cut-off state before the emission control phase, so that the OLED display panel is ensured not to be stolen for brightness in the dark working phase, and the display quality of the display panel is improved.
In the embodiment of the pixel driving circuit shown in fig. 2, the transistors used may be thin film transistors or field effect transistors or other devices having the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except for the gate, one pole is referred to as a first pole, and the other pole is referred to as a second pole.
Further, the transistors may be classified into n-type transistors or p-type transistors according to their characteristics. In the pixel driving circuit provided in each embodiment of the present invention, all transistors are illustrated by taking p-type MOS transistors as an example, and a high level is output by Vdd and a low level is output by Vss. It is contemplated that the use of n-type transistors and the appropriate power supply voltage in the driver circuit can be easily conceived by those skilled in the art without any creative effort, and therefore, is within the scope of the embodiments of the present invention and will not be described herein.
Referring to fig. 3, a p-type transistor T8 and a p-type transistor T9 are adopted, and by using a nand gate logic circuit, a gate of a transistor T8 is connected to a light emission control signal of the GOA unit of the current stage, a first pole of a transistor T8 is connected to a high level signal VGH, a gate of a transistor T9 and a first pole of a transistor T9 are both connected to the high level signal VGH, for example, a first power voltage Vdd is used as the high level signal VGH, a second pole of a transistor T8 is connected to a second pole of a transistor T9, and an output signal em (N) _ N is used as an initialization signal of the GOA unit of the current stage, so that the reset time of the electroluminescent device is sufficiently long, and the phenomenon that the electroluminescent device cannot be.
The embodiment shown in fig. 5 provides yet another pixel driving circuit, which differs from the pixel driving circuit shown in fig. 2 in the initialization signal. The initialization signal Re in this embodiment is an inverted signal of the emission control signal EM (n-1) of the previous stage GOA unit. The pixels of the GOA unit at the current level are reset by utilizing the initialization and compensation time of the GOA unit at the previous level, so that the reset time can be greatly increased.
As shown in fig. 6, a p-type transistor T10 and a p-type transistor T11 are adopted, and by using a nand gate logic circuit, the gate of the transistor T10 is connected to the emission control signal EM (N-1) of the previous-stage GOA unit, the first pole of the transistor T10 is connected to the high-level signal VGH, the gates of the transistor T11 and the first pole of the transistor T11 are both connected to the high-level signal VGH, for example, the first power voltage Vdd is used as the high-level signal VGH, the second pole of the transistor T10 is connected to the second pole of the transistor T11, and the output signal EM (N-1) _ N is used as the initialization signal of the current-stage GOA unit, so that the reset time of the electroluminescent device is long enough to avoid the phenomenon that the electroluminescent device cannot be.
An embodiment of the present invention further provides a driving method of a pixel driving circuit, for driving the pixel driving circuit provided in each embodiment, the driving method including:
an initialization step: and the initialization signal is effective, so that the first initialization transistor is switched on, the anode potential of the light-emitting device is initialized, and the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor.
The initializing step further comprises: the gate control signal of the previous GOA unit is effective, so that the second initialization transistor is conducted, and the gate potential of the driving transistor is initialized;
after the initializing step, the driving method further includes:
writing and compensating: the gate control signal of the GOA unit of the current level is effective, the writing transistor and the compensation transistor are conducted, the Data signal Data is written into the first pole of the driving transistor, and the gate voltage of the driving transistor is enabled to be a compensation voltage value;
a light emitting step: the light-emitting control signal is effective, the first light-emitting control transistor and the second light-emitting control transistor are conducted, the driving transistor is conducted, and the anode of the electroluminescent device is connected with the second power supply signal to drive the electroluminescent device to emit light.
The driving method of the pixel driving circuit shown in fig. 2 is further described with reference to fig. 4.
As shown in fig. 4, the initialization step, the writing and compensating step, and the light emitting step correspond to the initialization phase, the writing and compensating phase t2, and the light emitting control phase t3, respectively; the period of time during which the initialization signal em (N) _ N is valid is (T11+ T12), the first initialization transistor T1 is always turned on before the light emission control phase is entered, and the potential of the anode of the electroluminescent device OLED is pulled to the initialization voltage Vinit. The second storage capacitor C2 is connected with the electroluminescent device in parallel, the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor C2, the anode of the electroluminescent device OLED is completely reset within the effective duration of the initialization signal, no residual charge exists, the electroluminescent device OLED is always cut off before the light emitting control stage, and the sub-pixels cannot be stolen during low gray scales.
In the time period T11, when the gate control signal G (n-1) of the previous GOA cell is asserted, the second initialization transistor T3 is turned on, and the voltage at the n-point is pulled to Vinit.
In the write and compensation stage T12, when the gate control signal g (n) of the GOA cell of the current stage is asserted, the write transistor T4 is turned on, the Data signal Data is written to the point m, and the compensation transistor T3 is turned on, and the compensation transistor T2 charges the point n until the voltage at the point n is Data + Vth. At this stage, the first initialization transistor T1 is turned on, and since the emission control signal em (n) is inactive and the second emission control transistor T7 is turned off, the current does not flow to the anode of the electroluminescent device OLED through the second emission control transistor T7, and the potential of the anode of the electroluminescent device OLED is pulled to the initialization voltage Vinit.
In the active emission control period T13 of the emission control signal EM (n), the first emission control transistor T6 and the second emission control transistor T7 are turned on, the transistor T2 operates in the saturation region, and the driving current is I
OLED＝K(Vdd-Data)
2Driving current I
OLEDRegardless of the threshold voltage Vth.
The pixel driving circuit illustrated in fig. 2 always resets the OLED by using the time of the write and compensation phases, ensuring that there is sufficient reset time for the OLED at a higher refresh frequency.
The driving method of the pixel driving circuit shown in fig. 4 is further described with reference to fig. 5.
As shown in fig. 4, the initialization step, the writing and compensating step, and the light emitting step correspond to the initialization phase t21, the writing and compensating phase t22, and the light emitting control phase t23, respectively.
In the initialization period t21, when the initialization signal EM (N-1) _ N is asserted, the voltage at the point p is pulled to Vinit; when the gate control signal G (n-1) of the previous GOA cell is asserted, the second initialization transistor T3 is turned on, and the voltage at the n-point is pulled to Vinit. And resetting the pixel of the GOA unit by using the time for resetting and compensating the pixel of the GOA unit of the previous stage as the initialization signal of the GOA unit of the current stage by using the inverted signal of the light-emitting control signal EM (N-1) of the GOA unit of the previous stage, wherein the reset time of the GOA unit of the current stage can refer to the effective time of the initialization signal EM (N-1) _ N. When the gate control signal G (n-1) of the previous GOA cell is asserted, the second initialization transistor T3 is turned on, and the voltage at the n-point is pulled to Vinit.
In the write and compensation stage T22, when the gate control signal g (n) of the GOA cell of the current stage is asserted, the write transistor T4 is turned on, the Data signal Data is written to the point m, and the compensation transistor T3 is turned on, and the compensation transistor T2 charges the point n until the voltage at the point n is Data + Vth. In this stage, the driving transistor T2 is turned on, and the writing transistor T4 and the compensating transistor T3 are turned on and then off.
In the active light emission control period T23 when the light emission control signal EM (n) is asserted, the first and second light emission control transistors T6 and T7 are turned on, the transistor T2 operates in the saturation region, and the driving current is I
OLED＝K(Vdd-Data)
2Driving current I
OLEDRegardless of the threshold voltage Vth.
The invention further provides a display panel comprising the pixel driving circuit provided by the embodiments of the application.
The invention also provides a display device comprising the display panel.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (11)
1. A pixel driving circuit, comprising: a driving transistor, a first storage capacitor, a second storage capacitor, a first initialization module, and a light emission control module,
the grid electrode of the driving transistor is electrically connected with the first electrode of the first storage capacitor, and the first electrode and the second electrode of the driving transistor are respectively electrically connected with the light-emitting control module;
the light-emitting control module is connected with a light-emitting control signal and a first power voltage, and under the control of the light-emitting control signal, the anode of the electroluminescent device is connected with the first power voltage, so that the driving transistor is in a saturated state;
the first pole of the second storage capacitor is electrically connected with the anode of the electroluminescent device, the second pole of the second storage capacitor is electrically connected with the cathode of the electroluminescent device, and the cathode of the electroluminescent device is electrically connected with a second power voltage;
the first initialization module is connected with an initialization signal and an initialization voltage, and initializes the anode potential of the electroluminescent device under the control of the initialization signal, wherein the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor.
2. The pixel driving circuit according to claim 1, further comprising a second initialization module, wherein the second initialization module is connected to the gate control signal of the previous GOA unit and the initialization voltage, and initializes the first storage capacitor under the control of the gate control signal of the previous GOA unit.
3. The pixel driving circuit according to claim 2,
the first initialization module comprises a first initialization transistor, the grid electrode of the first initialization transistor is connected with an initialization signal, the first pole of the first initialization transistor is electrically connected with the initialization voltage, and the second pole of the first initialization transistor is electrically connected with the anode of the electroluminescent device;
the second initialization module comprises a second initialization transistor, a gate of the second initialization transistor is connected to a gate control signal of a previous GOA unit, a first pole of the second initialization transistor is electrically connected with the initialization voltage, and a second pole of the second initialization transistor is electrically connected with a first pole of the first storage capacitor.
4. The pixel driving circuit according to claim 2, further comprising: a write and compensation module;
a first pole of the first storage capacitor is electrically connected with the grid electrode of the driving transistor, the writing and compensating module and the second initializing module, and a second pole of the first storage capacitor is electrically connected with the first power voltage;
the writing and compensating module is connected to a gate control signal and a data signal of the GOA unit, writes the data signal into a first pole of the driving transistor under the control of the gate control signal of the GOA unit, and controls a second pole of the driving transistor to be connected with the gate of the driving transistor, so that the potential of the gate of the driving transistor is set to be a compensation voltage value.
5. The pixel driving circuit according to claim 4, wherein the writing and compensating module comprises a writing transistor and a compensating transistor;
the gate of the writing transistor is connected with a gate control signal of a GOA unit at the current stage, the first pole of the writing transistor is electrically connected with the data line, and the second pole of the writing transistor is electrically connected with the first pole of the driving transistor;
the grid electrode of the compensation transistor is connected to the grid electrode control signal of the GOA unit at the current stage, the first pole of the compensation transistor is electrically connected with the grid electrode of the driving transistor, and the second pole of the compensation transistor is electrically connected with the second pole of the driving transistor.
6. The pixel driving circuit according to claim 4, wherein the light emission control module comprises a first light emission control transistor and a second light emission control transistor;
a gate of the first light-emitting control transistor is connected to the light-emitting control signal, a first pole of the first light-emitting control transistor is electrically connected to the first power voltage, and a second pole of the first light-emitting control transistor is electrically connected to the first pole of the driving transistor;
the grid electrode of the second light-emitting control transistor is connected with the light-emitting control signal, the first pole of the second light-emitting control transistor is electrically connected with the second pole of the driving transistor, and the second pole of the second light-emitting control transistor is electrically connected with the anode of the electroluminescent device.
7. The pixel driving circuit according to any one of claims 1 to 6,
the initialization signal is an inverted signal of the light-emitting control signal; alternatively, the first and second electrodes may be,
the initialization signal is an inverted signal of a light emitting control signal of a previous GOA unit.
8. A driving method of a pixel driving circuit for driving the pixel driving circuit according to any one of claims 1 to 7, the driving method comprising:
an initialization step: and enabling an initialization signal to be effective to enable the first initialization transistor to be conducted and initialize the anode potential of the light-emitting device, wherein the effective duration of the initialization signal is longer than the discharge duration of the second storage capacitor.
9. The driving method of a pixel driving circuit according to claim 8,
the initialization step further comprises: the gate control signal of the previous GOA unit is effective, so that the second initialization transistor is conducted, and the gate potential of the driving transistor is initialized;
after the initializing step, the driving method further includes:
writing and compensating: the gate control signal of the GOA unit of the current level is effective, the writing transistor and the compensation transistor are conducted, the data signal is written into the first pole of the driving transistor, and the gate voltage of the driving transistor is enabled to be a compensation voltage value;
a light emitting step: the light-emitting control signal is effective, the first light-emitting control transistor and the second light-emitting control transistor are conducted, the driving transistor is conducted, and the anode of the light-emitting device is connected with the second power supply signal to drive the electroluminescent device to emit light.
10. A display panel comprising the pixel driving circuit according to any one of claims 1 to 7.
11. A display device characterized by comprising the display panel according to claim 10.
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| CN201911107822.9A CN110782838A (en) | 2019-11-13 | 2019-11-13 | Pixel driving circuit, driving method, display panel and display device |
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| CN201911107822.9A CN110782838A (en) | 2019-11-13 | 2019-11-13 | Pixel driving circuit, driving method, display panel and display device |
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