CN106097965B - Pixel driving circuit, pixel driving method and display device - Google Patents
Pixel driving circuit, pixel driving method and display device Download PDFInfo
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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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Abstract
The present disclosure provides a pixel driving circuit, a pixel driving method applied to the pixel driving circuit, and a display device including the pixel driving circuit. The pixel driving circuit includes a first transistor for transmitting a data signal to a first node; a second transistor for transmitting a reference voltage signal to the first node; a third transistor for transmitting a driving voltage to the second node; a fourth transistor for transmitting the reference voltage signal to a third node; a fifth transistor for connecting the second node and the third node; a sixth transistor for transmitting a signal of the second node to a fourth node, the fourth node being coupled to an organic light emitting diode; and a storage capacitor coupled between the first node and the third node. The display effect of the organic light emitting diode display device can be more uniform.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a pixel driving method of the pixel driving circuit, and a display device including the pixel driving circuit.
Background
Compared with the liquid crystal display device in the conventional technology, the OLED (Organic Light Emitting Diode) display device has the characteristics of faster response speed, better color purity and brightness, higher contrast, wider viewing angle and the like. Therefore, it is gradually receiving attention from display technology developers.
A pixel unit in an OLED display device mainly includes an organic light emitting diode and a pixel unit driving circuit that drives the organic light emitting diode. A conventional 2T1C pixel cell drive circuit is shown in fig. 1: which includes a first transistor M1, a drive transistor DTFT, and a storage capacitor C. Wherein the first transistor M1 is controlled by a first Scan signal Scan output from a Scan Line (Scan Line) for controlling a Data signal V of a Data Line (Data Line)dataThe driving transistor DTFT is used to control light emission of the organic light emitting diode OLED, and the storage capacitor C is used to provide a sustain voltage to the gate electrode of the driving transistor DTFT.
The organic light emitting diode OLED can emit light driven by a driving current generated when the driving transistor DTFT operates in a saturation state, and a voltage difference V between a gate and a source of the driving transistor DTFTgsIs PVEE+Vth_oled-VdataWherein V isth_oledIs the threshold voltage, V, of the organic light-emitting diode OLEDdataAs a data signal VdataVoltage of PVEEIs an organic light emitting diodeLow level voltage of the tube cathode connection. Then drive current IOLEDCan be expressed as:
wherein,for constants related to process and drive design, e.g. munFor carrier mobility, CoxIs gate oxide capacitance, W/L is transistor width-length ratio, VthIs the threshold voltage of the driving transistor DTFT.
However, due to technical limitations, the threshold voltage V of the driving transistor DTFTthAnd the uniformity of the threshold voltage of the organic light emitting diode OLED itself is generally poor, the threshold voltage V of the driving transistor DTFT may also occur in usethAnd a shift in the threshold voltage of the organic light emitting diode OLED itself. From the above formula, if the threshold voltage V of the driving transistor DTFT between different pixel unitsthAnd the threshold voltage of the Organic Light Emitting Diode (OLED) is different, so that the difference of the driving current is caused, and the display brightness is not uniform; if the threshold voltage V of the drive transistorthIf the current drifts with time, the current may be different, and the display effect may be affected.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a pixel driving circuit, a pixel driving method of the pixel driving circuit, and a display device including the pixel driving circuit, which overcome one or more of the problems due to the limitations and disadvantages of the related art, at least to some extent.
According to a first aspect of the embodiments of the present disclosure, there is provided a pixel driving circuit including: a first transistor for turning on in response to a scan signal to transmit a data signal to a first node; a second transistor for turning on in response to a light emission control signal to transmit a reference voltage signal to the first node; a third transistor for turning on in response to the light emission control signal to transmit a driving voltage to a second node; a fourth transistor for turning on in response to a first control signal to transmit the reference voltage signal to a third node; a fifth transistor for turning on in response to a second control signal to connect the second node and the third node; a sixth transistor for turning on in response to the voltage signal of the third node to transmit the signal of the second node to a fourth node, the fourth node being coupled to an organic light emitting diode; a storage capacitor coupled between the first node and the third node.
In an exemplary embodiment of the present disclosure, the first to sixth transistors each have a control terminal, a first terminal, and a second terminal, respectively, wherein: a control terminal of the first transistor receives the scan signal, a first terminal of the first transistor receives the data signal, and a second terminal of the first transistor is coupled to the first node; a control terminal of the second transistor receives the light emitting control signal, a first terminal of the second transistor receives the reference voltage signal, and a second terminal of the second transistor is coupled to the first node; a control end of the third transistor receives the light emitting control signal, a first end of the third transistor receives the driving voltage, and a second end of the third transistor is coupled to the second node; a control terminal of the fourth transistor receives the first control signal, a first terminal of the fourth transistor receives the reference voltage signal, and a second terminal of the fourth transistor is coupled to the third node; a control terminal of the fifth transistor receives the second control signal, a first terminal of the fifth transistor is coupled to the second node, and a second terminal of the fifth transistor is coupled to the third node; a control terminal of the sixth transistor is coupled to the third node, a first terminal of the sixth transistor is coupled to the second node, and a second terminal of the sixth transistor is coupled to the fourth node.
In an exemplary embodiment of the present disclosure, the pixel driving circuit further includes: a seventh transistor for turning on in response to the first control signal to transmit a reverse voltage signal to the fourth node.
In an exemplary embodiment of the present disclosure, the seventh transistor has a control terminal, a first terminal, and a second terminal; wherein: a control terminal of the seventh transistor receives the first control signal, a first terminal of the seventh transistor receives an inverted voltage signal, and a second terminal of the seventh transistor is coupled to the fourth node.
In one exemplary embodiment of the present disclosure, the transistors are all N-type transistors. The driving voltage of the pixel driving circuit is a high level voltage; the anode of the organic light emitting diode is coupled to the fourth node, and the cathode of the organic light emitting diode is coupled to a low level voltage.
In one exemplary embodiment of the present disclosure, the transistors are all P-type transistors. The driving voltage is a low level voltage; the cathode of the organic light emitting diode is coupled to the fourth node, and the anode of the organic light emitting diode is coupled to a high level voltage.
According to a second aspect of the embodiments of the present disclosure, there is provided a pixel driving method, applied in one exemplary embodiment of the present disclosure, the method including: a data writing stage for controlling the first transistor and the fourth transistor to be turned on by the scan signal and the first control signal, and controlling the second transistor, the third transistor and the fifth transistor to be turned off by the emission control signal and the second control signal; the data signal is transmitted to the first node through the first transistor; the reference voltage signal is transmitted to the third node through the fourth transistor; a threshold compensation stage for controlling the first transistor and the fifth transistor to be turned on by the scan signal and the second control signal, and controlling the fourth transistor, the second transistor and the third transistor to be turned off by the first control signal and the emission control signal; the voltage of the third node is transmitted to the second node through the fifth transistor; a light emission control stage for controlling the second transistor and the third transistor to be turned on by the light emission control signal and controlling the first transistor, the fourth transistor and the fifth transistor to be turned off by the scan signal, the first control signal and the second control signal; the reference voltage signal is transmitted to the first node through the second transistor, the driving voltage is transmitted to the second node through the third transistor, the sixth transistor generates a driving current to be transmitted to the organic light emitting diode, and the organic light emitting diode emits light in response to the driving current.
In an exemplary embodiment of the present disclosure, the pixel driving circuit further includes a seventh transistor for turning on in response to the first control signal to transmit a reverse voltage signal to the fourth node; the data writing phase further comprises that the seventh transistor is controlled to be conducted through the first control signal, and the reverse voltage signal is transmitted to the fourth node through the seventh transistor.
According to a third aspect of the embodiments of the present disclosure, there is provided a display device including the pixel driving circuit described in one exemplary embodiment of the present disclosure.
The pixel driving circuit in an exemplary embodiment of the present disclosure, through an improvement of a circuit structure, enables a threshold voltage of a driving transistor (i.e., a sixth transistor) and a threshold voltage of an organic light emitting diode to be written into a storage capacitor in advance, so that an influence of the threshold voltage of the sixth transistor and the threshold voltage of the organic light emitting diode can be eliminated when a driving current is generated, thereby effectively compensating for a threshold voltage drift, ensuring uniformity and stability of the driving current, and further enabling luminance of a display device to be more uniform.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 is a schematic diagram of a pixel driving circuit in the prior art;
FIG. 2 is a schematic diagram of a pixel drive circuit in an example embodiment of the present disclosure;
fig. 3 is a driving timing diagram of a pixel driving circuit in an example embodiment of the present disclosure;
FIG. 4 is an equivalent circuit diagram of the pixel driving circuit of FIG. 2 during a data writing phase;
FIG. 5 is an equivalent circuit diagram of the pixel driving circuit of FIG. 2 during a threshold compensation phase;
fig. 6 is an equivalent circuit diagram of the pixel driving circuit in fig. 2 at a light emission control stage;
FIG. 7 is a schematic diagram of yet another pixel drive circuit in an example embodiment of the present disclosure;
fig. 8 is an equivalent circuit diagram of the pixel driving circuit in fig. 7 at a data writing stage.
Description of reference numerals:
m1 first transistor
M2 second transistor
M3 third transistor
M4 fourth transistor
M5 fifth transistor
M3 sixth transistor
M7 seventh transistor
C storage capacitor
OLED organic light emitting diode
PVDDDriving voltage
PVEELow level voltage
VdataData signal
VrefReference voltage signal
Scan Scan signal
Con1 first control signal
Con2 second control signal
Emit light-emitting control signal
VrevInverting voltage signal
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the shape and size are exaggerated, distorted, or simplified for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or steps may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, steps, structures, etc.
The present exemplary embodiment first provides a pixel driving circuit. As shown in fig. 2, the pixel driving circuit may include an organic light emitting diode OLED, a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a storage capacitor C, and the like. Wherein, the first transistor M1 can be used to turn on in response to the Scan signal Scan to convert the data signal V into the data signal VdataTo the first node N1. The second transistor M2 may be configured to be turned on in response to the emission control signal Emit to couple the reference voltage signal VrefTo the first node N1. The third transistor M3 may be configured to be turned on in response to the emission control signal Emit to drive the driving voltage PVDDTo the second node N2. The fourth transistor M4 may be used to turn on in response to the first control signal Con1 to couple the reference voltage signal VrefTo the third node N3. The fifth transistor M5 may be configured to turn on in response to the second control signal Con2 to connect the second node N2 and the third node N3. The sixth transistor M6 may be configured to turn on in response to the voltage signal of the third node N3 to transmit the signal of the second node N2 to the fourth node N4, and the fourth node N4 is coupled to the organic light emitting diode OLED. The storage capacitor C is coupled between the first node N1 and the third node N3. The pixel driving circuit can effectively compensate the threshold voltage of the sixth transistor M6 and the threshold voltage of the organic light emitting diode OLEDThe uniformity and stability of the driving current are ensured, and the brightness of the display device can be more uniform. The pixel drive circuit described above will be described in more detail with reference to fig. 2.
In this exemplary embodiment, each of the first to sixth transistors includes a control terminal, a first terminal, and a second terminal; as shown in fig. 2, taking the first to sixth transistors as N-type transistors as an example, the control terminal may be a gate of the transistor, the first terminal may be a source of the transistor, and the second terminal may be a drain of the transistor; however, in the thin film transistor, the source and the drain of the transistor are not strictly distinguished, and therefore the first terminal may be the drain of the transistor and the second terminal may be the source of the transistor. Referring to fig. 2, wherein:
the source of the first transistor M1 is connected to a data line to receive a data signal VdataThe drain of the first transistor M1 is coupled to the first node N1, and the gate of the first transistor M1 receives the Scan signal Scan, so that the data signal V can be generated in response to the Scan signal ScandataThe first node N1 is written. The source of the second transistor M2 is connected to a reference voltage signal line to receive the reference voltage signal VrefA drain of the second transistor M2 is coupled to the first node N1, and a gate of the second transistor M2 receives the emission control signal Emit, so that the reference voltage signal V may be generated in response to the emission control signal EmitrefThe first node N1 is written. The source of the third transistor M3 is connected to a driving signal line to receive the driving voltage PVDDA drain of the third transistor M3 is coupled to the second node N2, and a gate of the third transistor M3 receives the emission control signal Emit, so that the driving voltage P may be driven in response to the emission control signal EmitVDDTo the second node N2; in the present exemplary embodiment, the driving voltage PVDDFor example, may be a high level voltage. The source of the fourth transistor M4 is connected to the reference voltage signal line for receiving the reference voltage signal VrefThe drain of the fourth transistor M4 is coupled to a third node N3, and the gate of the fourth transistor M4 receives the first control signal Con1, and thus is responsive toThe first control signal Con1 is used to control the reference voltage signal VrefTo the third node N3. A source of the fifth transistor M5 is coupled to the second node N2, a drain of the fifth transistor M5 is coupled to the third node N3, and a gate of the fifth transistor M5 receives the second control signal Con2, so that the second node N2 and the third node N3 can be communicated in response to the second control signal Con 2. The source of the sixth transistor M6 is coupled to the second node N2, the drain of the sixth transistor M6 is coupled to a fourth node N4, and the gate of the sixth transistor M6 is coupled to the third node N3, so that the signal of the second node N2 can be transmitted to the fourth node N4 in response to the voltage signal of the third node N3. An anode of the organic light emitting diode OLED may be coupled to the fourth node N4, and a cathode of the organic light emitting diode OLED may be coupled to the low-level voltage PVEEAnd (4) coupling. The first plate of the storage capacitor C may be coupled to a first node N1, and the second plate of the storage capacitor C may be coupled to a third node N3. The following describes each part in more detail with reference to the pixel driving method of the pixel driving circuit in fig. 2:
fig. 3 is a control timing diagram of the pixel driving method of the pixel driving circuit in fig. 2, in which the level states of the emission control signal Emit, the Scan signal Scan, the first control signal Con1, and the second control signal Con2 in three stages, i.e., a data writing stage T1, a threshold compensation stage T2, and an emission control stage T3 are shown.
Referring to fig. 4, it is an equivalent circuit diagram of the pixel driving circuit when the control timing is operated to the data writing phase T1. In the data writing phase T1, the Scan signal Scan and the first control signal Con1 are both high, so as to control the first transistor M1 and the fourth transistor M4 to be turned on; the emission control signal Emit and the second control signal Con are both low, and the second transistor M2, the third transistor M3, and the fifth transistor M5 are controlled to be turned off.
During the data writing phase T1, the data signal VdataThe reference voltage signal V is transmitted to the first node N1 through the first transistor M1refIs transmitted to the third node N3 through the fourth transistor M4, thereby being performed for the storage capacitor CAnd (6) charging. The voltage at the first node N1 is the voltage at the first plate of the storage capacitor C, i.e. the data signal VdataVoltage of (d); at this time, the voltage of the third node N3 is the voltage of the second plate of the storage capacitor C, i.e. the reference voltage signal VrefThe voltage of (c).
Referring to fig. 5, it is an equivalent circuit diagram of the pixel driving circuit when the control timing is operated to the threshold compensation stage T2. In the threshold compensation period T2, the Scan signal Scan and the second control signal Con2 are both at a high level, so that the first transistor M1 and the fifth transistor M5 are controlled to be turned on, and the first control signal Con1 and the emission control signal Emit are both at a low level, so that the second transistor M2, the third transistor M3 and the fourth transistor M4 are controlled to be turned off.
During the threshold compensation period T2, the voltage of the third node N3, i.e., the voltage of the second plate of the storage capacitor C, is transmitted to the second node N2 through the fifth transistor M5 due to the gate voltage V of the sixth transistor M6gInitially equal to the voltage of the second plate of the storage capacitor C at this stage, i.e. the reference voltage signal VrefThus, the gate voltage V of the sixth transistor M6gHigher than source voltage (P)VEE+Vth_oled) Wherein V isth_oledThe sixth transistor M6 is equivalent to diode connection, the gate voltage V of the sixth transistor M6 is the threshold voltage of the organic light emitting diodegDue to the low level voltage PVEEIs lowered until Vg＝PVEE+Vth_oled+Vth(ii) a Wherein, VthIs the threshold voltage of the sixth transistor M6; meanwhile, the third node N3 is conducted to the second node N2, so that the voltage of the second plate of the storage capacitor is equal to VgRealizing the threshold voltage V of the organic light-emitting diode OLEDth_oledAnd the threshold voltage V of the sixth transistor M6thWriting into a storage capacitor C with a voltage difference V between two endsg-VdataI.e. PVEE+Vth_oled+Vth-Vdata。
Referring to fig. 6, there is an equivalent circuit diagram of the pixel driving circuit when the control timing is run to the light emission control period T3. In the emission control period T3, the emission control signal Emit is at a high level to control the second transistor M2 and the third transistor M3 to be turned on, and the Scan signal Scan, the first control signal Con1 and the second control signal Con2 are all at a low level to control the first transistor M1, the fourth transistor M4 and the fifth transistor M5 to be turned off.
During the light emission control period T3, the reference voltage signal VrefThe driving voltage P is transmitted to the first node N1 through the second transistor M2VDDThe third transistor M3 is connected to the second node N2, the fourth transistor M4 and the fifth transistor M5 are turned off, the charge in the storage capacitor C cannot flow, and the voltage at the first plate of the storage capacitor C, i.e., the voltage at the first node N1, is changed from VdataBecomes VrefThen, the voltage of the second plate of the storage capacitor C, i.e. the gate voltage V of the sixth transistor M6gIs changed into PVEE+Vth_oled+Vth-(Vdata-Vref). At this time, the voltage difference V between the gate and the source of the sixth transistor M6gsIs (P)VEE+Vth_oled+Vth-(Vdata-Vref)-(PVEE+Vth_oled)＝Vth-Vdata+VrefAccording to the formula of the driving current
It can be seen that the driving current of the sixth transistor M6 isAnd the threshold voltage V of the sixth transistor M6thAnd the threshold voltage of the organic light emitting diode OLED.
As can be seen from this, in the pixel driving circuit of the present exemplary embodiment, the threshold voltage V of the driving transistor, i.e., the sixth transistor M6, is setthAnd the threshold voltage of the organic light emitting diode OLED is written into the storage capacitor in advance, therebyWhen the driving current is generated, the influence of the threshold voltage of the sixth transistor M6 and the threshold voltage of the organic light emitting diode OLED is eliminated, so that the threshold voltage drift is effectively compensated, the uniformity and stability of the driving current are ensured, and the brightness of the display device is more uniform.
Referring to fig. 7, in other exemplary embodiments of the present disclosure, the pixel driving circuit may further include a seventh transistor M7. The seventh transistor M7 may be configured to turn on in response to the first control signal Con1 to invert the voltage signal VrevTo the fourth node N4 to thereby reverse the organic light emitting diode OLED. The seventh transistor includes a control terminal, a first terminal and a second terminal, as shown in fig. 7, for example, the seventh transistor is an N-type transistor, the control terminal may be a gate of the transistor, the first terminal may be a source of the transistor, and the second terminal may be a drain of the transistor. Wherein the source of the seventh transistor receives the inverted voltage signal VrevA drain of the seventh transistor is coupled to the fourth node N4, and a gate of the seventh transistor receives the first control signal Con1, so that the voltage signal V may be inverted in response to the first control signal Con1revThe introduction into the fourth node N4 inverts the organic light emitting diode OLED.
Referring to fig. 8, it is an equivalent circuit diagram of the pixel driving circuit after adding the seventh transistor M7 when the control timing is operated to the data writing stage T1. When the seventh transistor M7 is turned on in response to the first control signal Con1, the voltage signal V will be invertedrevWhen the voltage is led to the fourth node N4, the organic light emitting diode OLED is inverted, and the voltage of the fourth node N4 is kept unchanged due to the fact that the seventh transistor M7 is turned off in the future threshold compensation period T2, so that the organic light emitting diode OLED is not affected by the change of the drain voltage of the sixth transistor M6 to generate afterglow in the non-display period, and therefore the afterimage is eliminated, and the display is clearer.
In the above-described exemplary embodiments, all the transistors are N-type transistors; it will be readily apparent to those skilled in the art that the pixel driving circuit provided by the present disclosure can be easily modified to be all P-typeA pixel driving circuit of a thin film transistor. In an exemplary embodiment of the present disclosure, the transistors are all P-type transistors, and the driving voltage P is applied at this timeVDDIs a low level voltage; the cathode of the organic light emitting diode OLED is coupled to the fourth node N4, and the anode is coupled to the high level voltage. The adoption of the all-P type thin film transistor has the advantages of strong noise suppression capability; for example, low level is easier to realize in charge management because of low level conduction; of course, the pixel driving circuit provided in the present disclosure can also be easily changed to a CMOS (complementary metal Oxide Semiconductor) circuit or the like; the present invention is not limited to the pixel driving circuit provided in this embodiment, and will not be described herein again.
Further, a display device is also provided in the present exemplary embodiment. The display device comprises a plurality of data lines, a plurality of scanning lines and a plurality of scanning lines, wherein the scanning lines are used for providing scanning signals Scan; the pixel driving circuits are electrically connected to the data lines and the scanning lines; at least one of the pixel driving circuits includes any one of the pixel driving circuits described above in this exemplary embodiment. The pixel driving circuit compensates the threshold voltage drift of the driving transistor and the organic light emitting diode, so that the OLED display is stable, the uniformity of the display brightness of the display device is improved, and the display quality can be greatly improved. The display device may include any product or component with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (9)
1. A pixel driving circuit, comprising:
a first transistor for turning on in response to a scan signal to transmit a data signal to a first node;
a second transistor for turning on in response to a light emission control signal to transmit a reference voltage signal to the first node;
a third transistor for turning on in response to the light emission control signal to transmit a driving voltage to a second node;
a fourth transistor for turning on in response to a first control signal to transmit the reference voltage signal to a third node;
a fifth transistor for turning on in response to a second control signal to connect the second node and the third node;
a sixth transistor for turning on in response to the voltage signal of the third node to transmit the signal of the second node to a fourth node, the fourth node being coupled to an organic light emitting diode;
a seventh transistor, configured to be turned on in response to the first control signal to transmit an inverse voltage signal to the fourth node, wherein a control terminal receives the first control signal, a first terminal receives the inverse voltage signal, and a second terminal is coupled to the fourth node;
a storage capacitor coupled between the first node and the third node;
wherein the second node is located between the third transistor and the sixth transistor and is disposed on a side of the sixth transistor away from the organic light emitting diode.
2. The pixel driving circuit according to claim 1, wherein the first to sixth transistors each have a control terminal, a first terminal, and a second terminal, respectively, wherein:
a control terminal of the first transistor receives the scan signal, a first terminal of the first transistor receives the data signal, and a second terminal of the first transistor is coupled to the first node;
a control terminal of the second transistor receives the light emitting control signal, a first terminal of the second transistor receives the reference voltage signal, and a second terminal of the second transistor is coupled to the first node;
a control end of the third transistor receives the light emitting control signal, a first end of the third transistor receives the driving voltage, and a second end of the third transistor is coupled to the second node;
a control terminal of the fourth transistor receives the first control signal, a first terminal of the fourth transistor receives the reference voltage signal, and a second terminal of the fourth transistor is coupled to the third node;
a control terminal of the fifth transistor receives the second control signal, a first terminal of the fifth transistor is coupled to the second node, and a second terminal of the fifth transistor is coupled to the third node;
a control terminal of the sixth transistor is coupled to the third node, a first terminal of the sixth transistor is coupled to the second node, and a second terminal of the sixth transistor is coupled to the fourth node.
3. The pixel driving circuit according to any one of claims 1 or 2, wherein the transistors are all N-type transistors.
4. The pixel driving circuit according to claim 3, wherein the driving voltage is a high level voltage; the anode of the organic light emitting diode is coupled to the fourth node, and the cathode of the organic light emitting diode is coupled to a low level voltage.
5. The pixel driving circuit according to any one of claims 1 or 2, wherein the transistors are all P-type transistors.
6. The pixel driving circuit according to claim 5, wherein the driving voltage is a low level voltage; the cathode of the organic light emitting diode is coupled to the fourth node, and the anode of the organic light emitting diode is coupled to a high level voltage.
7. A pixel driving method applied to the pixel driving circuit according to claim 1; characterized in that the method comprises:
a data writing stage for controlling the first transistor and the fourth transistor to be turned on by the scan signal and the first control signal, and controlling the second transistor, the third transistor and the fifth transistor to be turned off by the emission control signal and the second control signal; the data signal is transmitted to the first node through the first transistor; the reference voltage signal is transmitted to the third node through the fourth transistor;
a threshold compensation stage for controlling the first transistor and the fifth transistor to be turned on by the scan signal and the second control signal, and controlling the fourth transistor, the second transistor and the third transistor to be turned off by the first control signal and the emission control signal; the voltage of the third node is transmitted to the second node through the fifth transistor;
a light emission control stage for controlling the second transistor and the third transistor to be turned on by the light emission control signal and controlling the first transistor, the fourth transistor and the fifth transistor to be turned off by the scan signal, the first control signal and the second control signal; the reference voltage signal is transmitted to the first node through the second transistor, the driving voltage is transmitted to the second node through the third transistor, the sixth transistor generates a driving current to be transmitted to the organic light emitting diode, and the organic light emitting diode emits light in response to the driving current.
8. The pixel driving method according to claim 7, wherein the pixel driving circuit further comprises a seventh transistor for turning on in response to the first control signal to transmit a reverse voltage signal to the fourth node;
the data writing phase further comprises that the seventh transistor is controlled to be conducted through the first control signal, and the reverse voltage signal is transmitted to the fourth node through the seventh transistor.
9. A display device comprising the pixel driving circuit according to any one of claims 1 to 6.
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| CN109509430B (en) | 2017-09-15 | 2020-07-28 | 京东方科技集团股份有限公司 | Pixel driving circuit and method and display device |
| CN108109590A (en) * | 2017-12-11 | 2018-06-01 | 京东方科技集团股份有限公司 | OLED pixel driving circuit, its driving method and include its display device |
| CN108281112A (en) * | 2018-02-05 | 2018-07-13 | 上海天马有机发光显示技术有限公司 | Pixel-driving circuit and its control method, display panel and display device |
| CN109584803B (en) * | 2019-01-04 | 2021-01-26 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display panel |
| CN110890056A (en) * | 2019-11-25 | 2020-03-17 | 南京中电熊猫平板显示科技有限公司 | Self-luminous display device and in-pixel compensation circuit |
| TWI761037B (en) * | 2021-01-14 | 2022-04-11 | 友達光電股份有限公司 | Pixel circuit |
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