CN110047432B - Pixel circuit, driving method thereof, display panel and display device - Google Patents
Pixel circuit, driving method thereof, display panel and display device Download PDFInfo
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- CN110047432B CN110047432B CN201910465494.3A CN201910465494A CN110047432B CN 110047432 B CN110047432 B CN 110047432B CN 201910465494 A CN201910465494 A CN 201910465494A CN 110047432 B CN110047432 B CN 110047432B
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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 pixel circuit, a driving method thereof, a display panel and a display device, wherein the pixel circuit resets a grid electrode of a driving transistor by using a first reset signal, resets an anode of an electroluminescent device by using a second reset signal, and enables the first reset signal to be larger than the second reset signal, so that the voltage difference between the first reset signal and a data signal is reduced, and the charging time can be shorter under the driving of a driving circuit with the same driving capacity; under the condition of ensuring the same charging time, the driving capability of the driving circuit can be reduced so as to reduce the energy consumption.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel circuit, a driving method thereof, a display panel and a display device.
Background
Organic light Emitting diodes (Organic L light Emitting diodes, O L ED) are one of the hot spots in the research field of current displays, and compared with liquid Crystal displays (L acquired Crystal Display, L CD), O L ED has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed and the like, and at present, O L ED Display screens in the Display field of mobile phones, PDAs, digital cameras and the like have begun to replace the traditional L CD Display screens, wherein the pixel circuit design is the core technical content of O L ED displays, and has important research significance.
In the related art, a pixel circuit includes: a first reset transistor and a second reset transistor, before writing data signals into the pixel circuit, in order to avoid the influence of the voltage remained in the pixel circuit on the written data signals, before writing data, the important node of the pixel circuit needs to be reset, wherein, the first reset transistor is used for resetting the grid of the driving transistor, the second reset transistor is used for resetting the anode of the electroluminescent device, and the first reset transistor and the second reset transistor receive the same reset signal, but in order to ensure that the electroluminescent device is not lightened in the non-luminous stage, the reset signal needs to be set to be close to or equal to the first voltage signal provided by the first voltage signal end connected with the electroluminescent device, namely the voltage setting of the reset signal is lower, thereby, the longer time is needed when writing data into the grid of the driving transistor, or a larger driving force is required, which is disadvantageous in reducing the charging time or saving the power consumption.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a driving method thereof, a display panel and a display device, so as to solve the above-mentioned problems in the pixel circuit in the related art.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including: the device comprises a first reset module, a second reset module, a driving transistor and an electroluminescent device;
the input end of the first reset module is electrically connected with a first reset signal end, the output end of the first reset module is electrically connected with the grid electrode of the driving transistor, and the control end of the first reset module is electrically connected with a reset control end;
the input end of the second reset module is electrically connected with a second reset signal end, the output end of the second reset module is respectively electrically connected with the anode of the electroluminescent device and the second electrode of the driving transistor, and the control end of the second reset module is electrically connected with the reset control end;
the first reset signal end provides a first reset signal which is larger than a second reset signal provided by the second reset signal end, and the first reset signal is smaller than a data signal written into the grid electrode of the driving transistor.
In one possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the cathode of the electroluminescent device is electrically connected to the first voltage signal terminal;
the second reset signal is equal to the first voltage signal provided to the first voltage signal terminal.
In one possible implementation manner, in the pixel circuit provided in this embodiment of the present invention, the first reset module includes: a first transistor;
the grid electrode of the first transistor is electrically connected with the reset control end, the first electrode of the first transistor is electrically connected with the first reset signal end, and the second electrode of the first transistor is electrically connected with the grid electrode of the driving transistor.
In one possible implementation manner, in the pixel circuit provided in this embodiment of the present invention, the second reset module includes: a second transistor;
the grid electrode of the second transistor is electrically connected with the reset control end, the first electrode of the second transistor is electrically connected with the second reset signal end, and the second electrode of the second transistor is electrically connected with the anode of the electroluminescent device.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the pixel circuit further includes: the data write transistor;
the gate of the data writing transistor is electrically connected with the scanning signal end, the first pole of the data writing transistor is electrically connected with the data signal end, and the second pole of the data writing transistor is electrically connected with the gate of the driving transistor.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the pixel circuit further includes: a first light emission control transistor and a second light emission control transistor;
a gate of the first light-emitting control transistor is electrically connected to a first light-emitting control terminal, a first electrode of the first light-emitting control transistor is electrically connected to a second voltage signal terminal, and a second electrode of the first light-emitting control transistor is electrically connected to the first electrode of the driving transistor;
the grid electrode of the second light-emitting control transistor is electrically connected with the second light-emitting control end, the first electrode of the second light-emitting control transistor is electrically connected with the second electrode of the driving transistor, and the second electrode of the second light-emitting control transistor is electrically connected with the anode of the electroluminescent device.
In a second aspect, an embodiment of the present invention further provides a driving method of a pixel circuit, where the method includes:
in a reset phase, simultaneously providing a first reset signal to the first reset signal terminal and providing a second reset signal to the second reset signal terminal;
wherein the first reset signal is greater than the second reset signal and less than a data signal provided to the gate of the driving transistor.
In a possible implementation manner, in the method for driving the pixel circuit provided by the embodiment of the present invention, the method further includes:
a first voltage signal provided to the first voltage signal terminal;
the first voltage signal is changed within a preset voltage range according to the power consumption of the pixel circuit and the brightness of the electroluminescent device.
In one possible implementation manner, in the driving method of the pixel circuit provided by the embodiment of the invention, the second reset signal is equal to the first voltage signal.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit described in any one of the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a display device, including the display panel described in the embodiment of the third aspect.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a pixel circuit, a driving method thereof, a display panel and a display device, wherein the pixel circuit comprises: the device comprises a first reset module, a second reset module, a driving transistor and an electroluminescent device; the input end of the first reset module is electrically connected with a first reset signal end, the output end of the first reset module is electrically connected with the grid electrode of the driving transistor, and the control end of the first reset module is electrically connected with a reset control end; the input end of the second reset module is electrically connected with a second reset signal end, the output end of the second reset module is respectively electrically connected with the anode of the electroluminescent device and the second electrode of the driving transistor, and the control end of the second reset module is electrically connected with the reset control end; the first reset signal end provides a first reset signal which is larger than a second reset signal provided by the second reset signal end, and the first reset signal is smaller than a data signal written into the grid electrode of the driving transistor. The pixel circuit resets the grid electrode of the driving transistor by using the first reset signal, resets the anode of the electroluminescent device by using the second reset signal, and makes the first reset signal larger than the second reset signal, so that the voltage difference between the first reset signal and the data signal is reduced, and the charging time can be shorter under the driving of the driving circuit with the same driving capacity; under the condition of ensuring the same charging time, the driving capability of the driving circuit can be reduced so as to reduce the energy consumption.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the related art;
FIG. 2 is a diagram illustrating a relationship between a voltage difference between a reset signal and a data signal and a charging time when the pixel circuit shown in FIG. 1 is charged;
fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
FIG. 4 is a graph showing a relationship between a voltage difference between a first reset signal and a data signal and a charging time when the pixel circuit shown in FIG. 3 is charged;
FIG. 5 is a second graph illustrating the relationship between the charging time and the voltage difference between the first reset signal and the data signal when the pixel circuit of FIG. 3 is charged;
fig. 6 is a second schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The related art pixel circuit, as shown in fig. 1, includes a first Reset transistor M1, a second Reset transistor M2, a driving transistor DT, a Data writing transistor M3 and an electroluminescent device O L ED, a Reset signal Vinit of a Reset signal terminal init is respectively supplied to a Gate of the driving transistor DT and an anode of the electroluminescent device O L ED by the first Reset transistor M1 and the second Reset transistor M2 under the control of a Reset control signal terminal Reset in a Reset phase, a Data signal Vdata supplied from a Data signal terminal Data is supplied to the Gate of the driving transistor DT by the Data writing transistor M3 under the control of a scan signal terminal Gate in a Data writing phase, a cathode of the electroluminescent device O L is electrically connected to a first voltage signal terminal E L VSS, the first pole of the driving transistor M3 is electrically connected to a second voltage signal terminal E L, wherein the first voltage signal terminal E L is a low potential, the second voltage signal terminal E L is a high potential, and the voltage signal terminal E is set to be equal to the voltage of the Gate of the first voltage signal terminal E8236 ED, thereby setting the voltage of the first voltage signal terminal E892 to be equal to the voltage of the non-lighting device.
In view of the above problems of the pixel circuit in the related art, embodiments of the present invention provide a pixel circuit, a driving method thereof, a display panel, and a display device. In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
The embodiment of the invention provides a pixel circuit, as shown in fig. 3, comprising a first reset module 1, a second reset module 2, a driving transistor DT and an electroluminescent device O L ED;
the input end of the first Reset module 1 is electrically connected with a first Reset signal end init1, the output end of the first Reset module 1 is electrically connected with the grid electrode of the driving transistor DT, and the control end of the first Reset module 1 is electrically connected with a Reset control end Reset;
the input end of the second Reset module 2 is electrically connected with a second Reset signal end init2, the output end of the second Reset module 2 is electrically connected with the anode of the electroluminescent device O L ED and the second pole of the driving transistor DT, respectively, and the control end of the second Reset module 2 is electrically connected with a Reset control end Reset;
the first reset signal terminal init1 provides the first reset signal vinit1, which is greater than the second reset signal terminal init2 provides the second reset signal vinit2, and the first reset signal vinit1 is smaller than the data signal Vdata written into the gate of the driving transistor DT.
Specifically, in the pixel circuit provided by the embodiment of the invention, the gate of the driving transistor DT is reset by the first reset signal vinit1, and the anode of the electroluminescent device O L ED is reset by the second reset signal vinit2, as shown in fig. 4 and 5, the first reset signal vinit1 is larger than the second reset signal vinit2, which reduces the voltage difference between the first reset signal vinit1 and the data signal Vdata, as shown in fig. 4, when the data writing is performed under the driving of the driving circuit with the same driving capability, the time used for writing from the first reset signal vinit1 to the data signal Vdata is t1, and the time used for writing from the second reset signal vinit2 to the data signal is t2, as can be known from fig. 4, the time vdt 1 is far shorter than t2, that is the time for charging the pixel after the first reset signal is used, the pixel circuit can be applied to the display panel, and the large-size display panel power consumption can be ensured, and the driving circuit can reduce the driving capability and display effect as shown in the large-size display panel can be reduced as shown in the display panel.
The voltage value of the first reset signal is selected according to the voltage range value of the data signal, which is a voltage value within a certain voltage range and is supplied to each pixel, and therefore, the voltage value of the first reset signal should be selected to be smaller than the minimum voltage value within the voltage range.
Alternatively, in the pixel circuit provided by the embodiment of the invention, as shown in fig. 3, the cathode of the electroluminescent device O L ED is electrically connected to the first voltage signal terminal E L VSS;
the second reset signal vinit2 is equal to the first voltage signal provided to the first voltage signal terminal E L VSS.
In order to ensure that the electroluminescent device does not have the problem of black screen illumination in the non-light emitting stage, it is necessary to ensure that the voltage difference between the anode and the cathode of the electroluminescent device is less than the voltage required for illuminating the electroluminescent device, and the voltage of the second reset signal may be set to be similar to the voltage of the first voltage signal, so as to ensure that the voltage difference between the anode and the cathode of the electroluminescent device is not enough to illuminate the electroluminescent device.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 6, the first reset module 1 includes: a first transistor T1;
the gate of the first transistor T1 is electrically connected to the Reset control terminal Reset, the first pole of the first transistor T1 is electrically connected to the first Reset signal terminal init1, and the second pole of the first transistor T1 is electrically connected to the gate of the driving transistor DT.
Specifically, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 6, the first transistor T1 may be an N-type transistor, in which case the first transistor T1 is in an on state when the Reset control terminal Reset is at a high level, and the first transistor T1 is in an off state when the Reset control terminal Reset is at a low level; the first transistor T1 may also be a P-type transistor (not shown in the figure), in which case the first transistor T1 is in a conducting state when the Reset control terminal Reset is low, and the first transistor T1 is in a blocking state when the Reset control terminal Reset is high; and is not limited herein.
Specifically, in the pixel circuit provided in the embodiment of the present invention, when the first transistor is in a conducting state under the control of the reset control terminal, the first reset signal is transmitted to the gate of the driving transistor through the conducting first transistor, so as to reset the gate voltage of the driving transistor.
The above is merely an example of the specific structure of the first reset module in the pixel circuit, and in the specific implementation, the specific structure of the first reset module 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, as shown in fig. 6, the second reset module 2 includes: a second transistor T2;
the gate of the second transistor T2 is electrically connected to the Reset control terminal Reset, the first pole of the second transistor T2 is electrically connected to the second Reset signal terminal init2, and the second pole of the second transistor T2 is electrically connected to the anode of the electroluminescent device O L ED.
Specifically, in the pixel circuit according to the embodiment of the present invention, as shown in fig. 6, the second transistor T2 may be an N-type transistor, in which the second transistor T2 is in an on state when the Reset control terminal Reset is at a high level, and the second transistor T2 is in an off state when the Reset control terminal Reset is at a low level; the second transistor T2 may also be a P-type transistor (not shown in the figure), in which case the second transistor T2 is in a conducting state when the Reset control terminal Reset is at a low level, and the second transistor T2 is in a blocking state when the Reset control terminal Reset is at a high level; and is not limited herein.
Specifically, in the pixel circuit provided in the embodiment of the present invention, when the second transistor is in a conducting state under the control of the reset control terminal, the second reset signal is transmitted to the anode of the electroluminescent device through the conducting second transistor, so as to reset the anode voltage of the electroluminescent device.
The above is merely an example of the specific structure of the second reset module in the pixel circuit, and in the specific implementation, the specific structure of the second reset module 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, as shown in fig. 6, the pixel circuit further includes: a data write transistor T3;
the Gate of the Data writing transistor T3 is electrically connected to the scan signal terminal Gate, the first pole of the Data writing transistor T3 is electrically connected to the Data signal terminal Data, and the second pole of the Data writing transistor T3 is electrically connected to the Gate of the driving transistor DT.
Specifically, in the pixel circuit provided by the embodiment of the invention, as shown in fig. 6, the data writing transistor T3 may be an N-type transistor, in which case, the data writing transistor T3 is in a turned-on state when the scan signal terminal Gate is at a high level, and the data writing transistor T3 is in a turned-off state when the scan signal terminal Gate is at a low level; the data writing transistor T3 may also be a P-type transistor (not shown in the figure), in which case the data writing transistor T3 is turned on when the Gate of the scan signal terminal is at a low level, and the data writing transistor T3 is turned off when the Gate of the scan signal terminal is at a high level; and is not limited herein.
In the pixel circuit provided by the embodiment of the invention, when the data writing transistor is in a conducting state under the control of the scanning signal terminal, the data signal provided by the data signal terminal writes the data signal into the gate of the driving transistor through the conducting data writing transistor.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 6, the pixel circuit further includes: a first light emission control transistor T4 and a second light emission control transistor T5;
a gate electrode of the first light emitting control transistor T4 is electrically connected to the first light emitting control terminal EM1, a first pole of the first light emitting control transistor T4 is electrically connected to the second voltage signal terminal E L VDD, and a second pole of the first light emitting control transistor T4 is electrically connected to the first pole of the driving transistor DT;
the gate of the second light emission controlling transistor T5 is electrically connected to the second light emission controlling terminal EM2, the first pole of the second light emission controlling transistor T5 is electrically connected to the second pole of the driving transistor DT, and the second pole of the second light emission controlling transistor T5 is electrically connected to the anode of the electroluminescent device O L ED.
Specifically, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 6, the first light-emitting control transistor T4 may be an N-type transistor, and at this time, the first light-emitting control transistor T4 is in an on state when the first light-emitting control terminal EM1 is at a high level, and the first light-emitting control transistor T4 is in an off state when the first light-emitting control terminal EM1 is at a low level; the first light emitting control transistor T4 may also be a P-type transistor (not shown in the figure), in which case the first light emitting control transistor T4 is in a conducting state when the first light emitting control terminal EM1 is low level, and the first light emitting control transistor T4 is in a blocking state when the first light emitting control terminal EM1 is high level; and is not limited herein.
Specifically, in the pixel circuit provided by the embodiment of the invention, when the first light-emitting control transistor is in a conducting state under the control of the first light-emitting control terminal, the second voltage signal provided by the second voltage signal terminal provides the second voltage signal to the first pole of the driving transistor through the conducting first light-emitting control transistor.
Specifically, in the pixel circuit provided by the embodiment of the present invention, as shown in fig. 6, the second emission control transistor T5 may be an N-type transistor, in which case the second emission control transistor T5 is in a turned-on state when the second emission control terminal EM2 is at a high level, and the second emission control transistor T5 is in a turned-off state when the second emission control terminal EM2 is at a low level; the second emission control transistor T5 may also be a P-type transistor (not shown), in which case the second emission control transistor T5 is in a conducting state when the second emission control terminal EM2 is at a low level, and the second emission control transistor T5 is in a blocking state when the second emission control terminal EM2 is at a high level; and is not limited herein.
Specifically, in the pixel circuit provided by the embodiment of the invention, when the second light-emitting control transistor is in a conducting state under the control of the second light-emitting control terminal, the signal of the second pole of the driving transistor is provided to the anode of the electroluminescent device, so as to drive the electroluminescent device to emit light.
In the pixel circuit, the first light-emission control terminal and the second light-emission control terminal may be the same light-emission control terminal, so as to reduce the wiring of the pixel circuit.
Based on the same inventive concept, an embodiment of the present invention provides a driving method of a pixel circuit, including:
in the reset stage, simultaneously providing a first reset signal to the first reset signal terminal and providing a second reset signal to the second reset signal terminal;
the first reset signal is greater than the second reset signal, and the first reset signal is less than the data signal provided to the gate of the driving transistor.
The driving process and principle of the pixel circuit have been explained in detail in the above embodiments, and are not described herein again.
Optionally, in the driving method of the pixel circuit provided in the embodiment of the present invention, the method further includes:
a first voltage signal provided to a first voltage signal terminal;
the first voltage signal varies within a preset voltage range according to the power consumption of the pixel circuit and the brightness of the electroluminescent device.
Specifically, in the driving method of the pixel circuit according to the embodiment of the present invention, the first voltage signal is a dynamic voltage signal, and is not a fixed voltage value, and the first voltage signal is dynamically adjusted by using a correlation algorithm according to the power consumption of the pixel circuit and the brightness of the electroluminescent device during the display process of the display panel.
In order to ensure that the electroluminescent device does not have the problem of black screen luminescence, the second reset signal of the second reset signal end can be set to be linked with the first voltage signal, namely when the first voltage signal is increased, the second reset signal is correspondingly increased, and the voltage difference between the first voltage signal and the second voltage signal is not enough to enable the electroluminescent device to be luminous.
Specifically, the second reset signal may be made equal to the first voltage signal.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel, where the display panel includes the pixel circuit provided in any of the above embodiments.
The specific working principle and the specific implementation of the display panel are the same as those of the pixel circuit, and the specific implementation can be performed by referring to the embodiment of the pixel circuit, which is not described herein again.
Based on the same inventive concept, as shown in fig. 7, an embodiment of the present invention further provides a display device, which includes the display panel provided in the above embodiment.
The display device is suitable for various displays such as an Organic electroluminescent display, an inorganic electroluminescent display, an Active Matrix Organic light Emitting Diode (Active Matrix/Organic L light Emitting Diode, AMO L ED) and the like, and can be any product or component with a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like, and is not limited herein.
The embodiment of the invention provides a pixel circuit, a driving method thereof, a display panel and a display device, wherein the pixel circuit comprises: the device comprises a first reset module, a second reset module, a driving transistor and an electroluminescent device; the input end of the first reset module is electrically connected with a first reset signal end, the output end of the first reset module is electrically connected with the grid electrode of the driving transistor, and the control end of the first reset module is electrically connected with a reset control end; the input end of the second reset module is electrically connected with a second reset signal end, the output end of the second reset module is respectively electrically connected with the anode of the electroluminescent device and the second electrode of the driving transistor, and the control end of the second reset module is electrically connected with the reset control end; the first reset signal end provides a first reset signal which is larger than a second reset signal provided by the second reset signal end, and the first reset signal is smaller than a data signal written into the grid electrode of the driving transistor. The pixel circuit resets the grid electrode of the driving transistor by using the first reset signal, resets the anode of the electroluminescent device by using the second reset signal, and makes the first reset signal larger than the second reset signal, so that the voltage difference between the first reset signal and the data signal is reduced, and the charging time can be shorter under the driving of the driving circuit with the same driving capacity; under the condition of ensuring the same charging time, the driving capability of the driving circuit can be reduced so as to reduce the energy consumption.
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 (11)
1. A pixel circuit, comprising: the device comprises a first reset module, a second reset module, a driving transistor and an electroluminescent device;
the input end of the first reset module is electrically connected with a first reset signal end, the output end of the first reset module is electrically connected with the grid electrode of the driving transistor, and the control end of the first reset module is electrically connected with a reset control end;
the input end of the second reset module is electrically connected with a second reset signal end, the output end of the second reset module is respectively electrically connected with the anode of the electroluminescent device and the second electrode of the driving transistor, and the control end of the second reset module is electrically connected with the reset control end;
in a reset phase, simultaneously providing a first reset signal to the first reset signal terminal and providing a second reset signal to the second reset signal terminal;
the first reset signal end provides a first reset signal which is larger than a second reset signal provided by the second reset signal end, and the first reset signal is smaller than a data signal written into the grid electrode of the driving transistor.
2. The pixel circuit according to claim 1, wherein the cathode of the electroluminescent device is electrically connected to a first voltage signal terminal;
the second reset signal is equal to the first voltage signal provided to the first voltage signal terminal.
3. The pixel circuit of claim 1, wherein the first reset module comprises: a first transistor;
the grid electrode of the first transistor is electrically connected with the reset control end, the first electrode of the first transistor is electrically connected with the first reset signal end, and the second electrode of the first transistor is electrically connected with the grid electrode of the driving transistor.
4. The pixel circuit of claim 1, wherein the second reset module comprises: a second transistor;
the grid electrode of the second transistor is electrically connected with the reset control end, the first electrode of the second transistor is electrically connected with the second reset signal end, and the second electrode of the second transistor is electrically connected with the anode of the electroluminescent device.
5. The pixel circuit of claim 1, further comprising: a data write transistor;
the gate of the data writing transistor is electrically connected with the scanning signal end, the first pole of the data writing transistor is electrically connected with the data signal end, and the second pole of the data writing transistor is electrically connected with the gate of the driving transistor.
6. The pixel circuit of claim 1, further comprising: a first light emission control transistor and a second light emission control transistor;
a gate of the first light-emitting control transistor is electrically connected to a first light-emitting control terminal, a first electrode of the first light-emitting control transistor is electrically connected to a second voltage signal terminal, and a second electrode of the first light-emitting control transistor is electrically connected to the first electrode of the driving transistor;
the grid electrode of the second light-emitting control transistor is electrically connected with the second light-emitting control end, the first electrode of the second light-emitting control transistor is electrically connected with the second electrode of the driving transistor, and the second electrode of the second light-emitting control transistor is electrically connected with the anode of the electroluminescent device.
7. A method of driving a pixel circuit according to any one of claims 1 to 6, the method comprising:
the first reset signal is greater than the second reset signal and less than a data signal provided to the gate of the drive transistor.
8. The method for driving the pixel circuit according to claim 7, when the pixel circuit is the pixel circuit according to claim 2, further comprising:
a first voltage signal provided to the first voltage signal terminal;
the first voltage signal is changed within a preset voltage range according to the power consumption of the pixel circuit and the brightness of the electroluminescent device.
9. The method for driving a pixel circuit according to claim 8, wherein the second reset signal is equal to the first voltage signal.
10. A display panel comprising the pixel circuit according to any one of claims 1 to 6.
11. A display device characterized by comprising the display panel according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN111312170A (en) * | 2019-11-13 | 2020-06-19 | 武汉华星光电半导体显示技术有限公司 | Pixel driving circuit and display device |
| CN111028767B (en) * | 2019-12-06 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and driving method |
| CN111341257B (en) * | 2020-03-24 | 2021-06-15 | 武汉天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN111968577B (en) * | 2020-08-27 | 2022-01-11 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN112102782A (en) * | 2020-09-25 | 2020-12-18 | 云谷（固安）科技有限公司 | Pixel driving circuit, display panel and display device |
| WO2022067460A1 (en) | 2020-09-29 | 2022-04-07 | 京东方科技集团股份有限公司 | Display panel and method for driving pixel circuit thereof, and display apparatus |
| CN115917634A (en) | 2020-09-30 | 2023-04-04 | 京东方科技集团股份有限公司 | Pixel circuit and display panel |
| CN112289269A (en) * | 2020-10-30 | 2021-01-29 | 合肥维信诺科技有限公司 | Pixel circuit, control method thereof and display panel |
| CN112289258B (en) * | 2020-11-06 | 2021-12-14 | 昆山工研院新型平板显示技术中心有限公司 | Driving method of pixel circuit, pixel circuit and display panel |
| CN115691411A (en) * | 2021-07-30 | 2023-02-03 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| WO2023004817A1 (en) * | 2021-07-30 | 2023-02-02 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method therefor, and display panel |
| CN113593472B (en) * | 2021-08-04 | 2022-12-06 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit, driving method thereof and display device |
| CN117174024B (en) * | 2023-09-12 | 2024-06-11 | 苇创微电子(上海)有限公司 | Method for reducing overall power consumption of OLED display panel |
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