CN115482779A - Pixel circuit, driving method thereof and display device - Google Patents
Pixel circuit, driving method thereof 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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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The invention relates to the technical field of display, and discloses a pixel circuit, a driving method thereof and a display device, wherein the pixel circuit comprises: the driving transistor, the light-emitting element and the shunt module; the driving transistor is used for driving the light-emitting element, and a second pole of the driving transistor is electrically connected with the first node; an anode of the light emitting element is electrically connected to the first node; the first end of the shunting module is electrically connected with the first node, the second end of the shunting module is electrically connected with the shunting end, the control end of the shunting module is connected with the first voltage signal, and the shunting module is used for generating leakage current under the control of the first voltage signal so as to shunt the driving current generated by the driving transistor to the shunting end. The invention effectively improves the stability of the current when the light-emitting element displays low gray scale.
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 a display device.
Background
Organic Light Emitting Diode (OLED) is one of the hot spots in the research field of flat panel displays, and compared with liquid crystal displays, OLED has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, etc., and at present, OLED has begun to replace the conventional LCD display screen in the display fields of mobile phones, PDAs, digital cameras, etc. The pixel circuit design is the core technical content of the OLED display, and has important research significance.
Unlike LCDs, which control brightness using a stable voltage, OLEDs are current driven and require a stable current to control light emission. However, the performance of the conventional pixel circuit is not satisfactory, and the current stability is not good when the light emitting device displays a low gray scale (low luminance).
Disclosure of Invention
In view of the above, the present invention provides a pixel circuit, a driving method thereof and a display device, which effectively improve the stability of current when the light emitting element displays low gray scale.
The present invention provides a pixel circuit, including: the driving transistor, the light emitting element and the shunt module; the driving transistor is used for driving the light-emitting element, and a second pole of the driving transistor is electrically connected with the first node; an anode of the light emitting element is electrically connected to the first node; the first end of the shunting module is electrically connected with the first node, the second end of the shunting module is electrically connected with the shunting end, the control end of the shunting module is connected with the first voltage signal, and the shunting module is used for generating leakage current under the control of the first voltage signal so as to shunt the driving current generated by the driving transistor to the shunting end.
Based on the same inventive concept, the invention also provides a driving method of the pixel circuit, and the pixel circuit comprises: the driving transistor, the light emitting element and the shunt module; the second pole of the driving transistor is electrically connected with the first node; an anode of the light emitting element is electrically connected to the first node; the first end of the shunt module is electrically connected with the first node, the second end of the shunt module is electrically connected with the shunt end, and the control end of the shunt module is connected with the first voltage signal; the driving method comprises the following steps: at least when the light-emitting element displays low brightness and the driving transistor generates driving current, the first voltage signal controls the shunt module to generate leakage current, and part of the driving current generated by the driving transistor is shunted to the shunt end.
Based on the same inventive concept, the invention also provides a display device comprising the pixel circuit provided by the invention.
Compared with the prior art, the pixel circuit, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
the pixel circuit comprises a shunt module, wherein a first end of the shunt module is electrically connected with a first node, a second end of the shunt module is electrically connected with a shunt end, a control end of the shunt module is connected with a first voltage signal, when a light-emitting element displays low brightness and a driving transistor generates driving current, the first voltage signal controls the shunt module to generate leakage current, and part of the driving current generated by the driving transistor is shunted to the shunt end. The controllable reposition of redundant personnel module of first voltage signal produces the leakage current promptly to when light emitting component shows low luminance, effectively improve drive transistor and produce drive current's current value, at this moment, when drive transistor receives external environment influence characteristic to change, drive current's current value change degree reduces, is favorable to promoting drive current's stability, thereby reduces light emitting component's luminance change value, improves the display effect. The first voltage signal is a fixed voltage signal, the first voltage signal controls the shunt module to generate leakage current, the current value of the driving current generated by the driving transistor is adjusted through the leakage current generated by the shunt module, and the first voltage signal can be adjusted according to the required leakage current before the light-emitting element works, so that the signal of the control end of the shunt module is not required to be adjusted in the working process of the light-emitting element, and the circuit is high in implementability.
Of course, it is not necessary for any product in which the present invention is practiced to be specifically designed to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a circuit diagram of a pixel circuit according to the present invention;
FIG. 2 is a circuit schematic of another pixel circuit provided by the present invention;
FIG. 3 is a circuit diagram of another pixel circuit provided by the present invention;
FIG. 4 is a circuit diagram of another pixel circuit provided by the present invention;
FIG. 5 is a circuit diagram of another pixel circuit provided by the present invention;
FIG. 6 is a timing diagram of a pixel circuit provided by the present invention;
FIG. 7 is a schematic plane view of a display device according to the present invention;
fig. 8 is a schematic partial structure diagram of another display device provided by the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
Fig. 1 is a circuit schematic diagram of a pixel circuit provided in the present invention, and referring to fig. 1, the present embodiment provides a pixel circuit including a driving transistor M1, a light emitting element 10, and a shunting module 20.
The driving transistor M1 is used for driving the light emitting element 10, and the second pole of the driving transistor M1 is electrically connected to the first node N1.
The anode of the light emitting element 10 is electrically connected to the first node N1.
A first end of the shunting module 20 is electrically connected to the first node N1, a second end of the shunting module 20 is electrically connected to the shunting end V1, a control end of the shunting module 20 is connected to the first voltage signal V2, and the shunting module 20 is configured to generate a leakage current under the control of the first voltage signal V2 to shunt the driving current generated by the driving transistor M1 to the shunting end V1.
Specifically, the driving transistor M1 is used to generate a driving current, thereby driving the light emitting element 10 to emit light. Therefore, the light emission luminance of the light emitting element 10 is closely related to the operation performance of the driving transistor M1. When the light emitting device 10 displays low luminance, the current value of the driving current generated by the driving transistor M1 is small, and at this time, when the characteristics of the driving transistor M1 affected by the external environment change, the current value of the driving current changes greatly, which causes poor stability of the driving current, and thus the luminance change value of the light emitting device 10 is large, which affects the display effect.
In this embodiment, the pixel circuit includes a shunting module 20, a first end of the shunting module 20 is electrically connected to the first node N1, a second end of the shunting module 20 is electrically connected to the shunting end V1, a control end of the shunting module 20 is connected to a first voltage signal V2, when the light emitting device 10 displays low luminance, and the driving transistor M1 generates a driving current, the first voltage signal V2 controls the shunting module 20 to generate a leakage current, and a part of the driving current generated by the driving transistor M1 is shunted to the shunting end V1. That is, the controllable shunting module 20 of the first voltage signal V2 generates the leakage current, so that when the light emitting element 10 displays low luminance, the current value of the driving current generated by the driving transistor M1 is effectively increased, and at this time, when the driving transistor M1 is influenced by the external environment and the characteristics are changed, the current value change degree of the driving current is reduced, which is beneficial to improving the stability of the driving current, so that the luminance change value of the light emitting element 10 is reduced, and the display effect is improved. Illustratively, when the light emitting device 10 displays low luminance, the current value of the current flowing through the light emitting device 10 is I2, and the current value of the current leakage generated by the shunting module 20 is I1, so that the driving transistor M1 generates the driving current value of I3, where I3 is equal to I2 plus I1.
Moreover, when the light emitting device 10 displays high luminance, the current value of the driving current generated by the driving transistor M1 is large, and the influence of the leakage current generated by the shunting module 20 on the current value of the driving current generated by the driving transistor M1 is small, so that the shunting module 20 can be controlled to generate the leakage current in the working process of the light emitting device 10 (when low luminance and high luminance are displayed). Therefore, the first voltage signal V2 is a fixed voltage signal, the first voltage signal V2 controls the shunt module 20 to generate a leakage current, the current value of the driving current generated by the driving transistor M1 is adjusted by the leakage current generated by the shunt module 20, and the first voltage signal V2 can be adjusted according to the required magnitude of the leakage current before the light emitting element 10 works, so that the signal of the control end of the shunt module 20 does not need to be adjusted in the working process of the light emitting element 10, and the circuit has high implementability.
Fig. 2 is a circuit schematic diagram of another pixel circuit provided in the present invention, and referring to fig. 2, in some alternative embodiments, the pixel circuit further includes a data writing module 30, a threshold compensation module 40, a first light emitting control module 51, a second light emitting control module 52, a first reset module 61, and a second reset module 62.
The gate of the driving transistor M1 is electrically connected to the second node N2, the first pole of the driving transistor M1 is electrically connected to the third node N3, and the second pole of the driving transistor M1 is electrically connected to the fourth node N4.
The control end of the Data writing module 30 is electrically connected to the first scanning signal end Scan1, the first end of the Data writing module 30 is electrically connected to the Data signal end Data, the second end of the Data writing module 30 is electrically connected to the third node N3, and the Data writing module 30 is configured to provide a Data signal to the third node N3 under the control of a signal of the first scanning signal end Scan 1.
A control terminal of the threshold compensation module 40 is electrically connected to the first Scan signal terminal Scan1, a first terminal of the threshold compensation module 40 is electrically connected to the fourth node N4, a second terminal of the threshold compensation module 40 is electrically connected to the second node N2, and the threshold compensation module 40 is configured to perform threshold compensation on the driving transistor M1 under the control of a signal of the first Scan signal terminal Scan 1.
The control end of the first light-emitting control module 51 is electrically connected to the light-emitting control signal line Emit, the first end of the first light-emitting control module 51 is electrically connected to the second power voltage end PVDD, the second end of the first light-emitting control module 51 is electrically connected to the third node N3, and the first light-emitting control module 51 is configured to control whether the second power voltage end PVDD and the first electrode of the driving transistor M1 are in a conducting state or a blocking state under the control of a signal of the light-emitting control signal line Emit.
The control end of the second light-emitting control module 52 is electrically connected to the light-emitting control signal line Emit, the first end of the second light-emitting control module 52 is electrically connected to the fourth node N4, the second end of the second light-emitting control module 52 is electrically connected to the first node N1, and the second light-emitting control module 52 is configured to enable the driving current generated on the driving transistor M1 to at least partially flow to the light-emitting element 10 under the control of a signal of the light-emitting control signal line Emit.
A control terminal of the first reset module 61 is electrically connected to the second Scan signal terminal Scan2, a first terminal of the first reset module 61 is electrically connected to the reference signal terminal Vref, a second terminal of the first reset module 61 is electrically connected to the second node N2, and the first reset module 61 is configured to reset the second node N2 under the control of a signal of the second Scan signal terminal Scan 2.
The control terminal of the second reset module 62 is electrically connected to the second Scan signal terminal Scan2, the first terminal of the second reset module 62 is electrically connected to the reference signal terminal Vref, the second terminal of the second reset module 62 is electrically connected to the first node N1, and the second reset module 62 is configured to reset the first node N1 under the control of the signal of the second Scan signal terminal Scan 2.
The first end of the shunting module 20 is electrically connected to the first node N1, the second end of the shunting module 20 is electrically connected to the shunting end V1, the control end of the shunting module 20 is connected to the first voltage signal V2, when the light emitting element 10 displays low luminance, the second light emitting control module 52 is turned on, a part of the driving current generated on the driving transistor M1 flows to the light emitting element 10, a part of the driving current generates leakage current through the shunting module 20 and flows to the shunting end V1, so that the driving current generated by the driving transistor M1 can be partially shunted to the shunting end V1, the current value of the driving current generated by the driving transistor M1 is effectively increased, at this time, when the driving transistor M1 is influenced by external environment and the characteristics are changed, the current value change degree of the driving current is decreased, which is beneficial to increasing the stability of the driving current, thereby decreasing the luminance change value of the light emitting element 10, and increasing the display effect.
It should be noted that, this embodiment exemplarily shows that the shunting module 20 may be disposed in the 7T1C pixel circuit, in other embodiments of the present invention, pixel circuits with other structures may also be provided with the shunting module 20, and a corresponding disposing manner may refer to a disposing manner of the shunting module 20 in this embodiment, which is not described herein any more.
Fig. 3 is a schematic circuit diagram of another pixel circuit provided by the present invention, and referring to fig. 3, in some alternative embodiments, the shunting module 20 includes a first transistor T1, a gate of the first transistor T1 is connected to the first voltage signal V2, a first pole of the first transistor T1 is electrically connected to the first node N1, and a second pole of the first transistor T1 is electrically connected to the shunting terminal V1.
Specifically, the gate of the first transistor T1 receives the first voltage signal V2, and the first transistor T1 enables a part of the driving current generated by the driving transistor M1 to generate a leakage current through the first transistor T1 and flow to the shunt terminal V1 under the control of the first voltage signal V2.
It should be noted that, the shunt module 20 shown in the present invention includes the first transistor T1 exemplarily, and in other embodiments of the present invention, the shunt module 20 may further include other structures, which are not described herein again.
With continued reference to fig. 3, in some alternative embodiments, the first transistor T1 is a P-type transistor.
It should be noted that fig. 3 exemplarily shows that the first transistor T1 is a P-type transistor, in other embodiments of the present invention, the first transistor T1 may also be an N-type transistor, which is not described herein again.
With continued reference to fig. 3, in some alternative embodiments, the shunt terminal V1 is connected to a low signal.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the shunting terminal V1 needs to meet a requirement that when the driving transistor M1 is turned on, the potential of the shunting terminal V1 is smaller than the potential of the first node N1, so that a part of the driving current generated by the driving transistor M1 can generate a leakage current through the first transistor T1 and flow to the shunting terminal V1. The shunting terminal V1 is connected to a low potential signal, and the potential of the shunting terminal V1 is lower than the potential of the first node N1, so that a part of the driving current generated by the driving transistor M1 can generate a leakage current through the first transistor T1 and flow to the shunting terminal V1.
Fig. 4 is a circuit diagram of another pixel circuit provided by the present invention, and referring to fig. 4, in some alternative embodiments, the cathode of the light emitting element 10 is electrically connected to a first power voltage terminal PVEE, and the first power voltage terminal PVEE is multiplexed as a shunt terminal.
Specifically, the first power voltage terminal PVEE can be reused as a shunt terminal, and a part of the driving current generated by the driving transistor M1 can be shunted through the first power voltage terminal PVEE by passing through a leakage current generated by the first transistor T1, thereby being beneficial to reducing the difficulty of circuit wiring.
Fig. 5 is a circuit schematic diagram of another pixel circuit provided in the present invention, and referring to fig. 5, in some alternative embodiments, the reference signal terminal Vref is multiplexed as a shunt terminal.
Specifically, the reference signal terminal Vref can be reused as a shunt terminal, and a part of the driving current generated by the driving transistor M1 can be shunted through the reference signal terminal Vref by generating a leakage current through the first transistor T1, thereby facilitating reduction of circuit wiring difficulty.
It should be noted that, the embodiment of the present invention exemplarily shows that the first power voltage terminal PVEE or the reference signal terminal Vref can be multiplexed as the shunting terminal, and in other embodiments of the present invention, other low-potential signal terminals in the pixel circuit can also be multiplexed as the shunting terminal, which is not described in detail herein.
The present embodiment provides a driving method of a pixel circuit, wherein referring to fig. 1, the pixel circuit includes a driving transistor M1, a light emitting element 10, and a shunting module 20. The second electrode of the driving transistor M1 is electrically connected to the first node N1, and the anode of the light emitting element 10 is electrically connected to the first node. A first end of the shunt module 20 is electrically connected to the first node N1, a second end of the shunt module 20 is electrically connected to the shunt end V1, and a control end of the shunt module 20 is connected to the first voltage signal V2.
The driving method of the pixel circuit provided by the embodiment comprises the following steps: at least when the light emitting device 10 displays low luminance, when the driving transistor M1 generates the driving current, the first voltage signal V2 controls the shunting module 20 to generate the leakage current, and a part of the driving current generated by the driving transistor M1 is shunted to the shunting terminal V1.
Specifically, the driving transistor M1 is used to generate a driving current, thereby driving the light emitting element 10 to emit light. Therefore, the light emission luminance of the light emitting element 10 is closely related to the operation performance of the driving transistor M1. When the light emitting device 10 displays low luminance, the current value of the driving current generated by the driving transistor M1 is small, and at this time, when the characteristics of the driving transistor M1 affected by the external environment change, the current value of the driving current changes greatly, which causes poor stability of the driving current, and thus the luminance change value of the light emitting device 10 is large, which affects the display effect.
The pixel circuit in this embodiment includes a shunting module 20, a first end of the shunting module 20 is electrically connected to the first node N1, a second end of the shunting module 20 is electrically connected to the shunting end V1, a control end of the shunting module 20 is connected to a first voltage signal V2, when the light emitting device 10 displays low luminance, and when the driving transistor M1 generates a driving current, the first voltage signal V2 controls the shunting module 20 to generate a leakage current, and a part of the driving current generated by the driving transistor M1 is shunted to the shunting end V1. That is, the controllable shunting module 20 of the first voltage signal V2 generates the leakage current, so that when the light emitting element 10 displays low luminance, the current value of the driving current generated by the driving transistor M1 is effectively increased, and at this time, when the driving transistor M1 is influenced by the external environment and the characteristics are changed, the current value change degree of the driving current is reduced, which is beneficial to improving the stability of the driving current, so that the luminance change value of the light emitting element 10 is reduced, and the display effect is improved. Illustratively, when the light emitting device 10 displays low luminance, the current value of the current flowing through the light emitting device 10 is I2, and the current value of the current leakage generated by the shunting module 20 is I1, so that the driving transistor M1 generates the driving current value of I3, where I3 is equal to I2 plus I1.
Fig. 6 is a timing diagram of the pixel circuit provided in the present invention, referring to fig. 6, the first voltage signal V2 is a fixed voltage signal, and it is not necessary to adjust the signal at the control terminal of the shunting module 20 during the operation of the light emitting device 10, the driving method is simple, and the circuit has high implementability.
With continued reference to fig. 1 and fig. 6, in some alternative embodiments, when the light emitting device 10 displays high luminance, the first voltage signal V2 controls the shunting module 20 to generate a leakage current when the driving transistor M1 generates a driving current, and the driving current generated by the driving transistor M1 is partially shunted to the shunting terminal V1.
Specifically, when the light emitting device 10 displays high luminance, the current value of the driving current generated by the driving transistor M1 is large, and the leakage current generated by the shunting module 20 has a small influence on the current value of the driving current generated by the driving transistor M1, so that the shunting module 20 can be controlled to generate the leakage current during the operation of the light emitting device 10 (when low luminance and high luminance are displayed). Therefore, the signal of the control end of the shunt module 20 does not need to be adjusted during the operation of the light-emitting element 10, and the circuit has high feasibility of implementation.
With continued reference to fig. 1 and 6, in some alternative embodiments, the leakage current generated by the shunting module 20 is adjusted by adjusting the voltage value of the first voltage signal V2.
Specifically, since the first voltage signal V2 controls the shunting module 20 to generate the leakage current, and the current value of the driving current generated by the driving transistor M1 is adjusted through the leakage current generated by the shunting module 20, the first voltage signal V2 can be adjusted according to the required magnitude of the leakage current before the light emitting element 10 works, so that the signal of the control terminal of the shunting module 20 does not need to be adjusted in the working process of the light emitting element 10, and the circuit has high implementability.
The present embodiment provides a display device including the pixel circuit as described above.
Referring to fig. 7, fig. 7 is a schematic plan view of a display device according to the present invention. Fig. 7 provides a display device 1000 including a pixel circuit, wherein the pixel circuit is provided in any of the embodiments of the present invention. The embodiment of fig. 7 only takes a mobile phone as an example to describe the display device 1000, and it should be understood that the display device provided in the embodiment of the present invention may be other display devices with a display function, such as a computer, a television, a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the pixel circuit provided in the embodiment of the present invention, and specific reference may be made to the specific description of the pixel circuit in each embodiment described above, and this embodiment is not described herein again.
Fig. 8 is a partial schematic structural diagram of another display device provided by the present invention, and referring to fig. 8, in some alternative embodiments, the display device includes a plurality of pixel circuits 100, a control terminal of the shunting module 20 in each pixel circuit 100 is electrically connected to a first voltage signal line S1, and the first voltage signal line S1 is used for transmitting a first voltage signal V2.
Specifically, since it is not necessary to adjust the signal of the control terminal of the shunting module 20 in the working process of the light emitting element 10, and the first voltage signal V2 is a fixed voltage signal, the control terminal of the shunting module 20 in each pixel circuit 100 in the display device can be electrically connected to the first voltage signal line S1, and the first voltage signal V2 is transmitted to the control terminal of the shunting module 20 in each pixel circuit 100 in the display device through the first voltage signal line S1 at the same time, and it is not necessary to provide a control signal to the control terminal of the shunting module 20 in each pixel circuit 100 in a targeted manner according to the working state of each pixel circuit 100 in the display device, the driving method is simple, the circuit has high implementability, and it is beneficial to reduce the circuit wiring difficulty.
It should be noted that fig. 8 exemplarily shows that the display device includes 3 × 3 pixel circuits 100, in other embodiments of the present invention, the display device may further include other numbers of pixel circuits 100, and the description of the present invention is not repeated herein.
As can be seen from the foregoing embodiments, the pixel circuit, the driving method thereof, and the display device provided in the present invention at least achieve the following advantages:
the pixel circuit comprises a shunt module, wherein a first end of the shunt module is electrically connected with a first node, a second end of the shunt module is electrically connected with a shunt end, a control end of the shunt module is connected with a first voltage signal, when a light-emitting element displays low brightness and a driving transistor generates driving current, the first voltage signal controls the shunt module to generate leakage current, and part of the driving current generated by the driving transistor is shunted to the shunt end. The controllable reposition of redundant personnel module of first voltage signal produces the leakage current promptly to when light emitting component shows low luminance, effectively improve drive transistor and produce drive current's current value, at this moment, when drive transistor receives external environment influence characteristic to change, drive current's current value change degree reduces, is favorable to promoting drive current's stability, thereby reduces light emitting component's luminance change value, improves the display effect. The first voltage signal is a fixed voltage signal, the first voltage signal controls the shunt module to generate leakage current, the current value of the driving current generated by the driving transistor is adjusted through the leakage current generated by the shunt module, and the first voltage signal can be adjusted according to the required magnitude of the leakage current before the light-emitting element works, so that the signal of the control end of the shunt module is not required to be adjusted in the working process of the light-emitting element, and the circuit is high in implementability.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A pixel circuit, comprising:
the driving transistor, the light emitting element and the shunt module;
the driving transistor is used for driving the light-emitting element, and a second pole of the driving transistor is electrically connected with the first node;
an anode of the light emitting element is electrically connected to the first node;
the first end of reposition of redundant personnel module with first node electricity is connected, the second end and the reposition of redundant personnel end electricity of reposition of redundant personnel module are connected, first voltage signal is connected to the control end of reposition of redundant personnel module, the reposition of redundant personnel module be used for produce under the control of first voltage signal and leak current in order to incite somebody to action drive current that driver transistor produced shunts extremely the reposition of redundant personnel end.
2. The pixel circuit according to claim 1,
the shunt module comprises a first transistor, the grid electrode of the first transistor is connected with the first voltage signal, the first electrode of the first transistor is electrically connected with the first node, and the second electrode of the first transistor is electrically connected with the shunt end.
3. The pixel circuit according to claim 2,
the first transistor is an N-type transistor or a P-type transistor.
4. The pixel circuit according to claim 1,
the shunting end is connected with a low potential signal.
5. The pixel circuit according to claim 4,
the cathode of the light-emitting element is electrically connected with a first power supply voltage end, and the first power supply voltage end is multiplexed as the shunt end.
6. The pixel circuit according to claim 1,
the pixel circuit further comprises a data writing module, a threshold compensation module, a first light emitting control module, a second light emitting control module, a first reset module and a second reset module; wherein, the first and the second end of the pipe are connected with each other,
the grid electrode of the driving transistor is electrically connected with the second node, the first pole of the driving transistor is electrically connected with the third node, and the second pole of the driving transistor is electrically connected with the fourth node;
the control end of the data writing module is electrically connected with the first scanning signal end, the first end of the data writing module is electrically connected with the data signal end, and the second end of the data writing module is electrically connected with the third node;
the control end of the threshold compensation module is electrically connected with the first scanning signal end, the first end of the threshold compensation module is electrically connected with the fourth node, and the second end of the threshold compensation module is electrically connected with the second node;
the control end of the first light-emitting control module is electrically connected with a light-emitting control signal wire, the first end of the first light-emitting control module is electrically connected with a second power supply voltage end, and the second end of the first light-emitting control module is electrically connected with the third node;
the control end of the second light-emitting control module is electrically connected with a light-emitting control signal wire, the first end of the second light-emitting control module is electrically connected with the fourth node, and the second end of the second light-emitting control module is electrically connected with the first node;
the control end of the first reset module is electrically connected with the second scanning signal end, the first end of the first reset module is electrically connected with the reference signal end, and the second end of the first reset module is electrically connected with the second node;
the control end of the second reset module is electrically connected with the second scanning signal end, the first end of the second reset module is electrically connected with the reference signal end, and the second end of the second reset module is electrically connected with the first node.
7. The pixel circuit of claim 6,
and the reference signal end is multiplexed into the shunt end.
8. A driving method of a pixel circuit, the pixel circuit comprising: the driving transistor, the light-emitting element and the shunt module; the second pole of the driving transistor is electrically connected with the first node; an anode of the light emitting element is electrically connected to the first node; a first end of the shunt module is electrically connected with the first node, a second end of the shunt module is electrically connected with a shunt end, and a control end of the shunt module is connected with a first voltage signal;
the driving method includes:
at least when the light-emitting element displays low brightness and the driving transistor generates driving current, the first voltage signal controls the shunt module to generate leakage current, and part of the driving current generated by the driving transistor is shunted to the shunt end.
9. The method for driving the pixel circuit according to claim 8,
when the light emitting element displays high brightness and the driving transistor generates driving current, the first voltage signal controls the shunt module to generate leakage current, and part of the driving current generated by the driving transistor is shunted to the shunt end.
10. The method for driving the pixel circuit according to claim 8,
and regulating the leakage current generated by the shunting module by regulating the voltage value of the first voltage signal.
11. A display device comprising the pixel circuit according to any one of claims 1 to 7.
12. The display device according to claim 11,
the display device comprises a plurality of pixel circuits, wherein a control end of the shunt module in each pixel circuit is electrically connected with a first voltage signal line, and the first voltage signal line is used for transmitting the first voltage signal.
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