CN109712565A - A kind of pixel circuit, its driving method and electroluminescence display panel - Google Patents
A kind of pixel circuit, its driving method and electroluminescence display panel Download PDFInfo
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- CN109712565A CN109712565A CN201910210941.0A CN201910210941A CN109712565A CN 109712565 A CN109712565 A CN 109712565A CN 201910210941 A CN201910210941 A CN 201910210941A CN 109712565 A CN109712565 A CN 109712565A
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- 238000005401 electroluminescence Methods 0.000 title abstract description 6
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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 invention discloses a kind of pixel circuit, its driving method and electroluminescence display panel, which includes: the first initialization module, the second initialization module, anodic control module, Data write. module, drive control module, light emitting control module and luminescent device；Pass through the design to image element circuit structure, the current potential for the signal that the signal for providing the scanning signal end of pixel circuit and light emitting control end provide is opposite, therefore driving signal can be provided to scanning signal end and light emitting control end by a driving circuit, the setting for reducing driving circuit is advantageously implemented the narrow frame design of electroluminescence display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and an electroluminescent display panel.
Background
Electroluminescent displays are one of the hot spots in the research field of flat panel displays today, and compared with liquid crystal displays, electroluminescent devices have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, etc. at present, electroluminescent displays have begun to replace the conventional liquid crystal display screens in the flat panel display fields of mobile phones, PDAs, digital cameras, etc. Among them, the pixel circuit design is the core technology of the electroluminescent display, and has important research significance.
The pixel circuit in the related art includes a scan signal terminal and a light emission control terminal, and a signal of the scan signal terminal and a signal of the light emission control terminal need to be provided by two different driving circuits, so that two driving circuits need to be disposed in a non-display area of the electroluminescent display to control the pixel circuit. However, the two driving circuits occupy a large area of the non-display area, which is not favorable for realizing a narrow bezel design.
Therefore, how to design the pixel circuits to reduce the number of the driving circuits is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a pixel circuit, a driving method thereof and an electroluminescent display panel, which are used for solving the problem that narrow frame design cannot be realized due to the structural design of the pixel circuit.
In one aspect, an embodiment of the present invention provides a pixel circuit, including: the device comprises a first initialization module, a second initialization module, an anode control module, a data writing module, a driving control module, a light-emitting control module and a light-emitting device;
the first initialization module provides a signal of a reset signal end to a first node under the control of a reset control end;
the second initialization module enables the first node to be conducted with the second node and the third node under the control of a scanning signal end;
the anode control module supplies the potential of the third node to the anode of the light-emitting device under the control of the reset control terminal;
the data writing module supplies a signal of a data signal end to a fourth node under the control of the scanning signal end;
the driving control module determines the magnitude of a driving current for driving the light emitting device under the control of the potential of the second node and the potential of the fourth node;
the light-emitting control module provides a signal of a first voltage signal end to the fourth node under the control of a light-emitting control end;
wherein, the signal provided by the light-emitting control terminal is opposite to the potential of the signal provided by the scanning signal terminal.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the first initialization module includes: a fourth transistor;
the grid electrode of the fourth transistor is connected with the reset control end, the first pole of the fourth transistor is connected with the reset signal end, and the second pole of the fourth transistor is connected with the first node.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the second initialization module includes: a sixth transistor and a seventh transistor;
a grid electrode of the sixth transistor is connected with the scanning signal end, a first pole of the sixth transistor is connected with the first node, and a second pole of the sixth transistor is connected with the second node;
the grid electrode of the seventh transistor is connected with the scanning signal end, the first pole of the seventh transistor is connected with the first node, and the second pole of the seventh transistor is connected with the third node.
In one possible implementation manner, in the pixel circuit provided in the embodiment of the present invention, the anode control module includes: a third transistor;
a gate of the third transistor is connected to the reset control terminal, a first pole of the third transistor is connected to the third node, and a second pole of the third transistor is connected to an anode of the light emitting device;
and the cathode of the light-emitting device is connected with the second voltage signal end.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the data writing module includes: a fifth transistor;
the grid electrode of the fifth transistor is connected with the scanning signal end, the first pole of the fifth transistor is connected with the data signal end, and the second pole of the fifth transistor is connected with the fourth node.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the driving control module includes: a second transistor and a first capacitor;
a gate of the second transistor is connected to the second node, a first pole of the second transistor is connected to the fourth node, and a second pole of the second transistor is connected to the third node;
and the first electrode of the first capacitor is connected with the second node, and the second electrode of the first capacitor is connected with the first voltage signal end.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the light-emission control module includes: a first transistor;
the grid electrode of the first transistor is connected with the light-emitting control end; a first pole of the first transistor is connected to the first voltage signal terminal, and a second pole of the first transistor is connected to the fourth node.
In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, all the transistors are P-type transistors, or all the transistors are N-type transistors.
On the other hand, an embodiment of the present invention provides a method for driving a pixel circuit according to any one of the above embodiments, including:
in the first stage, the scanning signal terminal and the reset control terminal both provide a first level signal, the light-emitting control terminal provides a second level signal, and the signal provided by the data signal terminal is the same as the signal provided by the reset signal terminal;
in a second stage, the scan signal terminal provides the first level signal, the reset control terminal and the light-emitting control terminal provide the second level signal, and the data signal terminal provides a data signal for lighting the light-emitting device;
in a third stage, the scanning signal terminal and the reset control terminal both provide the second level signal, and the light-emitting control terminal provides the first level signal;
in the fourth stage, the scanning signal terminal provides the second level signal, and the light-emitting control terminal and the reset control terminal both provide the first level signal.
In yet another aspect, an embodiment of the present invention further provides an electroluminescent display panel, including a pixel circuit provided in any one of the above embodiments in a display area and a driving circuit in a non-display area;
the driving circuit comprises a plurality of cascaded shift registers, each stage of the shift register comprises a first output end and a second output end, and the potential of a signal provided by the first output end is opposite to that of a signal provided by the second output end;
the first output end of the shift register of the stage is connected with the scanning signal end of the pixel circuit of the row, and the second output end of the shift register of the stage is connected with the light-emitting control end of the pixel circuit of the row;
and the reset control end of the pixel circuit of the row is connected with the second output end of the next-stage shift register.
The invention has the following beneficial effects:
the embodiment of the invention provides a pixel circuit, a driving method thereof and an electroluminescent display panel, wherein the pixel circuit comprises: the device comprises a first initialization module, a second initialization module, an anode control module, a data writing module, a driving control module, a light-emitting control module and a light-emitting device; the first initialization module provides a signal of a reset signal end to a first node under the control of a reset control end; the second initialization module enables the first node to be conducted with the second node and the third node under the control of a scanning signal end; the anode control module supplies the potential of the third node to the anode of the light-emitting device under the control of the reset control terminal; the data writing module supplies a signal of a data signal end to a fourth node under the control of the scanning signal end; the driving control module determines the magnitude of a driving current for driving the light emitting device under the control of the potential of the second node and the potential of the fourth node; the light emitting control module provides a signal of the first voltage signal terminal to the fourth node under the control of the light emitting control terminal. Through the design of the pixel circuit structure, the potential of the signal provided by the scanning signal end of the pixel circuit is opposite to the potential of the signal provided by the light-emitting control end, so that the driving signal can be provided for the scanning signal end and the light-emitting control end through one driving circuit, the arrangement of the driving circuit is reduced, and the narrow frame design of the electroluminescent display panel is favorably realized.
Drawings
FIG. 1 is a schematic diagram of a circuit structure in an electroluminescence display panel in the related art;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 4 is a timing diagram of a pixel circuit according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for driving a pixel circuit according to an embodiment of the invention.
Detailed Description
A circuit structure for driving a Pixel display in an electroluminescence display panel in the related art is shown in fig. 1, the Pixel circuit Pixel includes a scan signal terminal and a light emission control terminal (a specific structure of the Pixel circuit is not shown), and due to the design of the Pixel circuit Pixel structure, a signal of the scan signal terminal and a signal of the light emission control terminal in the Pixel circuit Pixel cannot be provided by the same drive circuit, so that two drive circuits (a light emission control drive circuit EM and a Gate drive circuit Gate) need to be provided in a non-display area of the electroluminescence display to control the Pixel circuit Pixel. However, the two driving circuits occupy a large area of the non-display area, which is not favorable for realizing a narrow bezel design.
In view of the foregoing problems, embodiments of the present invention provide a pixel circuit, a driving method thereof, and an electroluminescent display panel, in which a structure of the pixel circuit is designed to make a potential of a signal at a scanning signal terminal opposite to a potential of a signal at a light emission control terminal, so that one driving circuit can be used to simultaneously provide driving signals to the scanning signal terminal and the light emission control terminal, the number of driving circuits is reduced, and a narrow frame design of the electroluminescent display panel is facilitated.
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a pixel circuit, a driving method thereof and an electroluminescent display panel according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Specifically, an embodiment of the present invention provides a pixel circuit, as shown in fig. 2, including: the device comprises a first initialization module 1, a second initialization module 2, an anode control module 3, a data writing module 4, a driving control module 5, a light-emitting control module 6 and a light-emitting device OLED;
the first initialization module 1 provides a signal of a reset signal terminal Vinitial to a first node A under the control of a reset control terminal EM _ n + 1;
the second initialization module 2 conducts the first node a with the second node G and the third node D under the control of the scan signal terminal Gate _ n;
the anode control module 3 supplies the potential of the third node D to the anode of the light emitting device OLED under the control of the reset control terminal EM _ n + 1;
the Data writing module 4 provides the Data signal end Data signal to the fourth node S under the control of the scanning signal end Gate _ n;
the driving control module 5 determines the magnitude of the driving current for driving the light emitting device OLED under the control of the potential of the second node G and the potential of the fourth node S;
the light emission control module 6 supplies a signal of the first voltage signal terminal ELVDD to the fourth node S under the control of the light emission control terminal EM _ n;
wherein, the signal provided by the emission control terminal EM _ n is opposite in potential to the signal provided by the scan signal terminal Gate _ n.
Specifically, in the pixel circuit provided in the embodiment of the present invention, through the arrangement of the first initialization module, the second initialization module, the anode control module, the data writing module, the driving control module, the light-emitting control module, and the light-emitting device, the potential of the signal provided by the scanning signal terminal of the pixel circuit is opposite to the potential of the signal provided by the light-emitting control terminal, so that a driving circuit can provide a driving signal to the scanning signal terminal and the light-emitting control terminal, thereby reducing the arrangement of the driving circuit, and facilitating the implementation of the narrow frame design of the electroluminescent display panel.
In addition to the above, the pixel circuit may also compensate for the threshold voltage of the driving transistor, i.e., the second transistor, to ensure uniformity of light emission of each pixel in the display panel.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the first initialization module 1 includes: a fourth transistor M4;
a gate of the fourth transistor M4 is connected to the reset control terminal EM _ n +1, a first pole of the fourth transistor M4 is connected to the reset signal terminal Vinitial, and a second pole of the fourth transistor M4 is connected to the first node a.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the fourth transistor may be a P-type transistor, and when the signal of the reset control terminal is at a low level, the fourth transistor is in an on state, and when the signal of the reset control terminal is at a high level, the fourth transistor is in an off state; the fourth transistor may also be an N-type transistor (not specifically shown in the figure), and in this case, when the signal of the reset control terminal is at a high level, the fourth transistor is in an on state, and when the signal of the reset control terminal is at a low level, the fourth transistor is in an off state; and is not particularly limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the second initialization module 2 includes: a sixth transistor M6 and a seventh transistor M7;
a Gate of the sixth transistor M6 is connected to the scan signal terminal Gate _ n, a first pole of the sixth transistor M6 is connected to the first node a, and a second pole of the sixth transistor M6 is connected to the second node G;
the Gate of the seventh transistor M7 is connected to the scan signal terminal Gate _ n, the first pole of the seventh transistor M7 is connected to the first node a, and the second pole of the seventh transistor M7 is connected to the third node D.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the sixth transistor may be a P-type transistor, and when the signal at the scan signal terminal is at a low level, the sixth transistor is in an on state, and when the signal at the scan signal terminal is at a high level, the sixth transistor is in an off state; the sixth transistor may also be an N-type transistor (not specifically shown in the figure), and in this case, when the signal of the scanning signal terminal is at a high level, the sixth transistor is in an on state, and when the signal of the scanning signal terminal is at a low level, the sixth transistor is in an off state; and is not particularly limited herein.
Similarly, the seventh transistor may be a P-type transistor, and is in an on state when the signal of the scan signal terminal is at a low level, and is in an off state when the signal of the scan signal terminal is at a high level; the seventh transistor may also be an N-type transistor (not specifically shown in the figure), and in this case, when the signal of the scanning signal terminal is at a high level, the seventh transistor is in an on state, and when the signal of the scanning signal terminal is at a low level, the seventh transistor is in an off state; and is not particularly limited herein.
It should be noted that, in the pixel circuit provided in the embodiment of the present invention, the control terminals of the sixth transistor and the seventh transistor are the same and are both scanning signal terminals, and the types of the transistors are also the same and are also N-type transistors or P-type transistors at the same time, so that the sixth transistor and the seventh transistor are ensured to be turned on or turned off at the same time in the same stage. For example, in the first phase, i.e., the node initialization phase, the sixth transistor is turned on to supply the potential of the first node to the second node, and the second node is initialized; the seventh transistor is turned on to supply the potential of the first node to the third node, and supplies an initialization signal to the anode of the light emitting device. In the second phase, namely the data writing phase, the sixth transistor and the seventh transistor are simultaneously turned on to write the data signal and the threshold voltage of the second transistor into the gate of the second diode, so that the capture of the threshold is realized.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the anode control module 3 includes: a third transistor M3;
a gate of the third transistor M3 is connected to the reset control terminal EM _ n +1, a first pole of the third transistor M3 is connected to the third node D, and a second pole of the third transistor M3 is connected to the anode of the light emitting device OLED;
the cathode of the light emitting device OLED is connected to the second voltage signal terminal ELVSS.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the third transistor may be a P-type transistor, and when the signal of the reset control terminal is at a low level, the third transistor is in an on state, and when the signal of the reset control terminal is at a high level, the third transistor is in an off state; the third transistor may also be an N-type transistor (not specifically shown in the figure), and in this case, when the signal of the reset control terminal is at a high level, the third transistor is in an on state, and when the signal of the reset control terminal is at a low level, the third transistor is in an off state; and is not particularly limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the data writing module 4 includes: a fifth transistor M5;
a Gate of the fifth transistor M5 is connected to the scan signal terminal Gate _ n, a first pole of the fifth transistor M5 is connected to the Data signal terminal Data, and a second pole of the fifth transistor M5 is connected to the fourth node S.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the fifth transistor may be a P-type transistor, and when the signal of the scan signal terminal is at a low level, the fifth transistor is in an on state, and when the signal of the scan signal terminal is at a high level, the fifth transistor is in an off state; the fifth transistor may also be an N-type transistor (not specifically shown in the figure), and in this case, when the signal of the scanning signal terminal is at a high level, the fifth transistor is in an on state, and when the signal of the scanning signal terminal is at a low level, the fifth transistor is in an off state; and is not particularly limited herein.
In the first stage, the signal provided by the data signal terminal is the same as the signal provided by the reset signal terminal, the fifth transistor is turned on, the reset signal provided by the data signal terminal is provided to the fourth node, so that the potentials of the second node and the fourth node are the same, and the second transistor is ensured to be in a cut-off state. And in the second stage, the signal provided by the data signal end is a data signal for driving the light-emitting device to emit light, the fifth transistor is conducted, and the data signal is provided for the fourth node so as to realize data writing and threshold capture.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the driving control module 5 includes: a second transistor M2 and a first capacitor C1;
a gate of the second transistor M2 is connected to the second node G, a first pole of the second transistor M2 is connected to the fourth node S, and a second pole of the second transistor M2 is connected to the third node D;
a first electrode of the first capacitor C1 is connected to the second node G, and a second electrode of the first capacitor C1 is connected to the first voltage signal terminal ELVDD.
Specifically, in the pixel circuit provided by the embodiment of the invention, the second transistor is a P-type transistor, and in order to ensure that the second transistor (i.e., the driving transistor) can normally operate, the voltage of the corresponding first voltage signal terminal is generally a positive voltage, and the voltage of the second voltage signal terminal is generally a ground voltage or a negative voltage.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 3, the light-emitting control module 6 includes: a first transistor M1;
the gate of the first transistor M1 is connected to the emission control terminal EM _ n; a first pole of the first transistor M1 is connected to the first voltage signal terminal ELVDD, and a second pole of the first transistor M1 is connected to the fourth node S.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the first transistor may be a P-type transistor, and when the signal of the light emission control terminal is at a low level, the first transistor is in an on state, and when the signal of the light emission control terminal is at a high level, the first transistor is in an off state; the first transistor may also be an N-type transistor (not specifically shown in the figure), and in this case, when the signal of the light emission control terminal is at a high level, the first transistor is in an on state, and when the signal of the light emission control terminal is at a low level, the first transistor is in an off state; and is not particularly limited herein.
The above is merely an example of the specific structure of each block in the pixel circuit, and in the specific implementation, the specific structure of each block is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, all the transistors are P-type transistors, or all the transistors are N-type transistors.
Preferably, all the transistors in the pixel circuit provided by the embodiment of the present invention may be designed as P-type transistors, so that the manufacturing process flow of the pixel circuit may be simplified.
It should be noted that, in the above embodiments of the present invention, the driving transistor is a P-type transistor, and the driving transistor is an N-type transistor and adopts the same design principle, which also belongs to the protection scope of the present invention.
In a specific implementation, the driving transistor and the switching transistor may be Thin Film Transistors (TFTs) or Metal Oxide Semiconductor field effect transistors (MOS), and are not limited herein. In specific implementations, the first and second poles of these transistors may be interchanged in function, depending on the type of transistor and the input signal, and are not specifically distinguished herein.
The following describes the operation of the pixel circuit provided by the embodiment of the present invention by taking the pixel circuit shown in fig. 3 and the timing sequence shown in fig. 4 as examples. The signal provided by the reset signal end is a low-level signal, the signal provided by the first voltage signal end is a high-level signal, the signal provided by the second voltage signal end is a low-level signal, and all the transistors are P-type transistors.
In the first stage, Gate _ n is 0, EM _ n is 1, EM _ n +1 is 0, and Data is 0;
at this stage, the reset control terminal EM _ n +1 is at a low level, the fourth transistor M4 is turned on, the reset signal of the reset signal terminal Vinitial is supplied to the first node a, and the first node a is initialized; the scan signal terminal Gate _ n is at a low level, the sixth transistor M6 is turned on to supply the reset signal of the first node a to the second node G (i.e., the Gate of the second transistor), the seventh transistor M7 is turned on to supply the reset signal of the first node a to the third node D, and the third transistor M3 is turned on to supply the reset signal of the third node D to the anode of the light emitting device OLED to initialize the anode of the light emitting device OLED; meanwhile, since the scan signal terminal Gate _ n is a low level signal, the fifth transistor M5 is also in a turned-on state, and the signal provided by the Data signal terminal Data is the same reset signal as the reset signal terminal at this time, the turned-on fifth transistor M5 provides the reset signal provided by the Data signal terminal Data to the fourth node S, and the potential of the second node G is kept the same as the potential of the fourth node S, so as to ensure that the second transistor M2 is in a turned-off state at this stage.
In the second stage, Gate _ n is 0, EM _ n is 1, EM _ n +1 is 1, and Data is 1;
at this stage, the scan signal terminal Gate _ n is a low level signal, the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7 are turned on, and the turned-on fifth transistor M5 supplies the Data signal Vdata supplied from the Data signal terminal Data to the fourth node S until the potential of the second node G is Vdata + Vth, where Vth represents the threshold voltage of the second transistor.
A third stage, where Gate _ n is 1, EM _ n is 0, EM _ n +1 is 1, and Data is 0;
at this stage, the scan signal terminal Gate _ n is at a high level, and the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7 are turned off; the light emission control terminal EM _ n is at a low level, the first transistor M1 is turned on to supply the signal of the first voltage signal terminal ELVDD to the fourth node S, and the second transistor M2 is turned on to supply the voltage for driving the light emitting device OLED to emit light to the third node D. Since the Gate of the third transistor M3 is connected to the reset control terminal EM _ n +1, and the potential of the signal of the reset control terminal EM _ n +1 is opposite to that of the scan signal terminal Gate _ n +1 in the pixel circuit for driving the next row of pixels, the third transistor M3 is in the off state at this stage, and the driving current cannot be formed to drive the light emitting device OLED to emit light.
The fourth stage, Gate _ n is 1, EM _ n is 0, EM _ n +1 is 0, and Data is 0;
at this stage, the emission control terminal EM _ n and the reset control terminal EM _ n +1 are both low level signals, and the first transistor M1 and the third transistor M3 are both turned on to form a current for driving the light emitting device OLED, so that the light emitting device OLED emits light.
Wherein, the luminous current is I-1/2K (Vgs-Vth)2＝1/2K(Velvdd-Vdata)2Where K is a coefficient, Vgs represents a voltage difference between a gate of the second transistor and a source of the second transistor, Vth represents a threshold voltage of the second transistor, and VelvddRepresents the voltage of the first voltage signal terminal, and Vdata represents the data signal. It can be seen that the pixel circuit described above implements compensation for the second transistor (i.e., the driving transistor) Vth, and improves the uniformity of the display panel, and the signals of the light emission control terminal and the scan signal terminal can be the same as each otherAnd a driving circuit is provided, so that the number of the driving circuits is reduced, and the narrow frame design of the electroluminescent display panel is favorably realized.
It should be noted that the data signal terminal provides the reset signal in the first phase, provides the data signal in the second phase, and sets the intermediate time (i.e. the peak value of the data signal) for providing the data signal at the second phase and the third phase alternation time in order to avoid the change of the data signal when the second phase and the third phase alternate due to the delay of the data signal.
Based on the same inventive concept, as shown in fig. 5, an embodiment of the present invention further provides a driving method of a pixel circuit, including:
s501, in the first stage, a scanning signal end and a reset control end both provide first level signals, a light-emitting control end provides second level signals, and signals provided by a data signal end are the same as signals provided by a reset signal end;
s502, in the second stage, a scanning signal end provides a first level signal, a reset control end and a light-emitting control end provide a second level signal, and a data signal end provides a data signal for lighting a light-emitting device;
s503, in the third stage, the scanning signal end and the reset control end both provide a second level signal, and the light-emitting control end provides a first level signal;
s504, in the fourth stage, the scanning signal end provides the second level signal, and the light-emitting control end and the reset control end both provide the first level signal.
The first level signal and the second level signal may be high level signals or low level signals, but when the first level signal is a high level signal, the second level signal is a low level signal; when the first level signal is a low level signal, the second level signal is a high level signal. Specifically, when each transistor is a P-type transistor, the first level signal is a low level signal, and the second level signal is a high level signal; when each transistor is an N-type transistor, the first level signal is a high level signal, and the second level signal is a low level signal.
The specific working principle of the driving method of the pixel circuit has been elaborated in the specific embodiment of the pixel circuit, so that the driving method of the pixel circuit may be implemented in the embodiment of the pixel circuit described above, and is not described herein again.
Based on the same inventive concept, an embodiment of the present invention further provides an electroluminescent display panel, including a pixel circuit provided in any one of the above embodiments in a display area and a driving circuit in a non-display area;
the driving circuit comprises a plurality of cascaded shift registers, each stage of shift register comprises a first output end and a second output end, and the potential of a signal provided by the first output end is opposite to that of a signal provided by the second output end;
the first output end of the shift register of the stage is connected with the scanning signal end of the pixel circuit of the row, and the second output end of the shift register of the stage is connected with the light-emitting control end of the pixel circuit of the row;
the reset control end of the pixel circuit of the row is connected with the second output end of the shift register of the next stage.
Specifically, in the electroluminescent display panel provided in the embodiment of the present invention, only one driving circuit may be disposed in the non-display area to provide a driving signal to each signal terminal of the pixel circuit, so as to reduce the area of the non-display area occupied by the driving circuit, which is beneficial to implementing a narrow bezel design.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the electroluminescent display panel provided by the embodiment of the invention. The display device may be a display, a mobile phone, a television, a notebook computer, an electronic paper, a digital photo frame, a navigator, an all-in-one machine, etc., and other essential components of the display device are those which should be understood by those skilled in the art, and are not described herein in detail nor should be construed as limitations of the present invention.
The embodiment of the invention provides a pixel circuit, a driving method thereof and an electroluminescent display panel, wherein the pixel circuit comprises: the device comprises a first initialization module, a second initialization module, an anode control module, a data writing module, a driving control module, a light-emitting control module and a light-emitting device; the first initialization module provides a signal of a reset signal end to a first node under the control of a reset control end; the second initialization module enables the first node to be conducted with the second node and the third node under the control of a scanning signal end; the anode control module supplies the potential of the third node to the anode of the light-emitting device under the control of the reset control terminal; the data writing module supplies a signal of a data signal end to a fourth node under the control of the scanning signal end; the driving control module determines the magnitude of a driving current for driving the light emitting device under the control of the potential of the second node and the potential of the fourth node; the light emitting control module provides a signal of the first voltage signal terminal to the fourth node under the control of the light emitting control terminal. Through the design of the pixel circuit structure, the potential of the signal provided by the scanning signal end of the pixel circuit is opposite to the potential of the signal provided by the light-emitting control end, so that the driving signal can be provided for the scanning signal end and the light-emitting control end through one driving circuit, the arrangement of the driving circuit is reduced, and the narrow frame design of the electroluminescent display panel is favorably realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A pixel circuit, comprising: the device comprises a first initialization module, a second initialization module, an anode control module, a data writing module, a driving control module, a light-emitting control module and a light-emitting device; wherein,
the first initialization module provides a signal of a reset signal end to a first node under the control of a reset control end;
the second initialization module enables the first node to be conducted with the second node and the third node under the control of a scanning signal end;
the anode control module supplies the potential of the third node to the anode of the light-emitting device under the control of the reset control terminal;
the data writing module supplies a signal of a data signal end to a fourth node under the control of the scanning signal end;
the driving control module determines the magnitude of a driving current for driving the light emitting device under the control of the potential of the second node and the potential of the fourth node;
the light-emitting control module provides a signal of a first voltage signal end to the fourth node under the control of a light-emitting control end;
wherein, the signal provided by the light-emitting control terminal is opposite to the potential of the signal provided by the scanning signal terminal.
2. The pixel circuit of claim 1, wherein the first initialization module comprises: a fourth transistor;
the grid electrode of the fourth transistor is connected with the reset control end, the first pole of the fourth transistor is connected with the reset signal end, and the second pole of the fourth transistor is connected with the first node.
3. The pixel circuit of claim 1, wherein the second initialization module comprises: a sixth transistor and a seventh transistor;
a grid electrode of the sixth transistor is connected with the scanning signal end, a first pole of the sixth transistor is connected with the first node, and a second pole of the sixth transistor is connected with the second node;
the grid electrode of the seventh transistor is connected with the scanning signal end, the first pole of the seventh transistor is connected with the first node, and the second pole of the seventh transistor is connected with the third node.
4. The pixel circuit of claim 1, wherein the anode control module comprises: a third transistor;
a gate of the third transistor is connected to the reset control terminal, a first pole of the third transistor is connected to the third node, and a second pole of the third transistor is connected to an anode of the light emitting device;
and the cathode of the light-emitting device is connected with the second voltage signal end.
5. The pixel circuit of claim 1, wherein the data write module comprises: a fifth transistor;
the grid electrode of the fifth transistor is connected with the scanning signal end, the first pole of the fifth transistor is connected with the data signal end, and the second pole of the fifth transistor is connected with the fourth node.
6. The pixel circuit according to claim 1, wherein the drive control module includes: a second transistor and a first capacitor;
a gate of the second transistor is connected to the second node, a first pole of the second transistor is connected to the fourth node, and a second pole of the second transistor is connected to the third node;
and the first electrode of the first capacitor is connected with the second node, and the second electrode of the first capacitor is connected with the first voltage signal end.
7. The pixel circuit according to claim 1, wherein the light emission control module comprises: a first transistor;
the grid electrode of the first transistor is connected with the light-emitting control end; a first pole of the first transistor is connected to the first voltage signal terminal, and a second pole of the first transistor is connected to the fourth node.
8. A pixel circuit according to any one of claims 2-7, wherein all of the transistors are P-type transistors or all of the transistors are N-type transistors.
9. A method of driving a pixel circuit according to any one of claims 1 to 8, comprising:
in the first stage, the scanning signal terminal and the reset control terminal both provide a first level signal, the light-emitting control terminal provides a second level signal, and the signal provided by the data signal terminal is the same as the signal provided by the reset signal terminal;
in a second stage, the scan signal terminal provides the first level signal, the reset control terminal and the light-emitting control terminal provide the second level signal, and the data signal terminal provides a data signal for lighting the light-emitting device;
in a third stage, the scanning signal terminal and the reset control terminal both provide the second level signal, and the light-emitting control terminal provides the first level signal;
in the fourth stage, the scanning signal terminal provides the second level signal, and the light-emitting control terminal and the reset control terminal both provide the first level signal.
10. An electroluminescent display panel comprising the pixel circuit according to any one of claims 1 to 8 in a display region and a driver circuit in a non-display region;
the driving circuit comprises a plurality of cascaded shift registers, each stage of the shift register comprises a first output end and a second output end, and the potential of a signal provided by the first output end is opposite to that of a signal provided by the second output end;
the first output end of the shift register of the stage is connected with the scanning signal end of the pixel circuit of the row, and the second output end of the shift register of the stage is connected with the light-emitting control end of the pixel circuit of the row;
and the reset control end of the pixel circuit of the row is connected with the second output end of the next-stage shift register.
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| CN201910210941.0A CN109712565B (en) | 2019-03-20 | 2019-03-20 | Pixel circuit, driving method thereof and electroluminescent display panel |
| PCT/CN2020/074363 WO2020186933A1 (en) | 2019-03-20 | 2020-02-05 | Pixel circuit, method for driving same, electroluminescent display panel, and display device |
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| CN201910210941.0A CN109712565B (en) | 2019-03-20 | 2019-03-20 | Pixel circuit, driving method thereof and electroluminescent display panel |
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| CN109712565B (en) | 2021-08-03 |
| WO2020186933A1 (en) | 2020-09-24 |
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