CN112037714A - 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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- CN112037714A CN112037714A CN202010959739.0A CN202010959739A CN112037714A CN 112037714 A CN112037714 A CN 112037714A CN 202010959739 A CN202010959739 A CN 202010959739A CN 112037714 A CN112037714 A CN 112037714A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
Abstract
The invention discloses a pixel circuit, a driving method thereof, a display panel and a display device.A reset module resets a driving module and a light-emitting device under the control of a signal of a reset signal end; the data writing module writes a signal of the data signal end and the threshold voltage of a driving transistor in the driving module into a grid electrode of the driving transistor under the control of a signal of the first scanning signal end; the light-emitting control module drives the light-emitting device to emit light under the signal control of the light-emitting control signal end; by arranging the black picture insertion module, after a light-emitting stage in a display frame time period, the driving transistor is controlled to be cut off under the control of a signal of the second scanning signal end so as to drive the light-emitting device not to emit light, and the black picture is inserted in the display frame time period, so that the purpose of inserting the black picture is realized under the condition of ensuring the charging time, the moving image response time of the display panel is further reduced, and the display effect is improved.
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 Diode (OLED) panels have the characteristics of flexibility, high contrast, low power consumption, and the like, and have attracted much attention. The pixel circuit is the core technical content of the OLED panel, and has important research significance. A method of inserting a black image between display frames is generally employed to remove an image of a previous frame, reducing a moving image response time of the organic light emitting display. However, displaying a black image between display frames requires twice the video frame rate, which makes the data charging time within each display frame short.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a driving method thereof, a display panel and a display device, which can insert a black frame while ensuring a charging time.
An embodiment of the present invention provides a pixel circuit, including: the device comprises a driving module, a light-emitting control module, a data writing module, a resetting module, a black picture inserting module and a light-emitting device; wherein the content of the first and second substances,
the reset module is configured to reset the driving module and the light emitting device under the signal control of a reset signal terminal;
the data writing module is configured to write a signal of a data signal end and a threshold voltage of a driving transistor in the driving module into a grid electrode of the driving transistor under the control of a signal of a first scanning signal end;
the light-emitting control module is configured to drive the light-emitting device to emit light under the signal control of a light-emitting control signal terminal;
the black picture insertion module is configured to control the driving transistor to be turned off under the signal control of the second scanning signal terminal to drive the light emitting device not to emit light.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the driving module includes: a drive transistor and a storage capacitor; wherein the content of the first and second substances,
the first end of the storage capacitor is electrically connected with the first power signal end, and the second end of the storage capacitor is electrically connected with the grid electrode of the driving transistor;
the grid electrode of the driving transistor is electrically connected with the initialization signal end through the reset signal end;
the first electrode of the driving transistor is electrically connected with the first power signal end through the light-emitting control module and is electrically connected with the data signal end through the data writing module;
the second pole of the driving transistor is electrically connected with the first pole of the light-emitting device through the light-emitting control module, and the second pole of the light-emitting device is electrically connected with the second power signal end.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the black frame insertion module includes: a first black picture transistor;
the gate of the first black picture transistor is electrically connected to the second scan signal terminal, the first electrode of the first black picture transistor is electrically connected to the gate of the driving transistor, and the second electrode of the first black picture transistor is electrically connected to the cut-off signal terminal.
In a possible implementation manner, in the pixel circuit provided in the embodiment of the present invention, the cut-off signal terminal and the first power signal terminal are the same signal terminal.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the black frame insertion module includes: a second black picture transistor;
the gate of the second black picture transistor is electrically connected to the second scan signal terminal, the first electrode of the second black picture transistor is electrically connected to the first electrode of the driving transistor, and the second electrode of the second black picture transistor is electrically connected to the black picture signal terminal.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the black frame insertion module includes: a third black picture transistor;
the gate of the third black picture transistor is electrically connected to the second scan signal terminal, the first electrode of the third black picture transistor is electrically connected to the gate of the driving transistor, and the second electrode of the third black picture transistor is electrically connected to the second electrode of the driving transistor.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the data writing module includes a first data writing transistor and the third black picture transistor; wherein the content of the first and second substances,
a first electrode of the first data writing transistor is electrically connected to the data signal terminal, a gate of the first data writing transistor is electrically connected to the first scan signal terminal, and a second electrode of the first data writing transistor is electrically connected to the first electrode of the driving transistor.
In a possible implementation manner, in the pixel circuit provided in the embodiment of the present invention, the data writing module includes a first data writing transistor and a second data writing transistor; wherein the content of the first and second substances,
a first electrode of the first data writing transistor is electrically connected to the data signal terminal, a gate electrode of the first data writing transistor is electrically connected to the first scan signal terminal, and a second electrode of the first data writing transistor is electrically connected to the first electrode of the driving transistor;
a first electrode of the second data writing transistor is electrically connected to the gate electrode of the driving transistor, a gate electrode of the second data writing transistor is electrically connected to the first scan signal terminal, and a second electrode of the second data writing signal terminal is electrically connected to the second electrode of the driving transistor.
In a possible implementation manner, in the pixel circuit provided in the embodiment of the present invention, the light-emitting control module includes a first light-emitting control transistor and a second light-emitting control transistor; wherein the content of the first and second substances,
a first electrode of the first light-emitting control transistor is conducted with the first power signal end, a gate electrode of the first light-emitting control transistor is electrically connected with the light-emitting control signal end, and a second electrode of the first light-emitting control transistor is electrically connected with the first electrode of the driving transistor;
a first electrode of the second light emission control transistor is electrically connected to a second electrode of the driving transistor, a gate of the second light emission control transistor is electrically connected to the light emission control signal terminal, and a second electrode of the second light emission control transistor is electrically connected to the first electrode of the light emitting device.
In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the reset module includes a first reset transistor and a second reset transistor; wherein the content of the first and second substances,
a first electrode of the first reset transistor is electrically connected with the initialization signal end, a grid electrode of the first reset transistor is electrically connected with the reset signal end, and a second electrode of the first reset transistor is electrically connected with a grid electrode of the driving transistor;
a first electrode of the second reset transistor is electrically connected to the initialization signal terminal, a gate electrode of the second reset transistor is electrically connected to the reset signal terminal, and a second electrode of the second reset transistor is electrically connected to the first electrode of the light emitting device.
On the other hand, the embodiment of the invention also provides a display panel, which comprises the pixel circuit provided by the embodiment of the invention.
On the other hand, the embodiment of the invention also provides a display device, which comprises the display panel provided by the embodiment of the invention.
On the other hand, an embodiment of the present invention further provides a driving method of the pixel circuit, including:
a reset phase, wherein the reset module resets the driving module and the light-emitting device;
in the data writing stage, the data writing module writes a signal of a data signal end and the threshold voltage of a driving transistor in the driving module into the grid electrode of the driving transistor;
the light-emitting control module drives the light-emitting device to emit light;
a black picture inserting stage, wherein the black picture inserting module controls the driving transistor to be cut off so as to drive the light-emitting device not to emit light;
the reset stage, the data writing stage, the light-emitting stage and the black picture inserting stage are sequentially and continuously formed into a display frame time period.
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, which comprise a driving module, a light-emitting control module, a data writing module, a resetting module, a black picture inserting module and a light-emitting device; the reset module resets the driving module and the light-emitting device under the control of a signal of the reset signal end; the data writing module writes a signal of the data signal end and the threshold voltage of a driving transistor in the driving module into a grid electrode of the driving transistor under the control of a signal of the first scanning signal end; the light-emitting control module drives the light-emitting device to emit light under the signal control of the light-emitting control signal end; by arranging the black picture insertion module, after a light-emitting stage in a display frame time period, the driving transistor is controlled to be cut off under the control of a signal of the second scanning signal end so as to drive the light-emitting device not to emit light, and the black picture is inserted in the display frame time period, so that the purpose of inserting the black picture is realized under the condition of ensuring the charging time, the moving image response time of the display panel is further reduced, and the display effect is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a display panel according to an embodiment of the invention;
fig. 6 is a flowchart of a driving method according to an embodiment of the present invention;
fig. 7 is a signal timing diagram of a pixel circuit according to an embodiment of the invention;
fig. 8 is a signal timing diagram of another pixel circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connect" or "electrically connect," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
A pixel circuit provided in an embodiment of the present invention, as shown in fig. 1 to 4, includes: a driving module 00, a light emitting control module 10, a data writing module 20, a reset module 30, a black picture insertion module 40, and a light emitting device L; wherein the content of the first and second substances,
the Reset module 30 is configured to Reset the driving module 00 and the light emitting device L under the signal control of the Reset signal terminal Reset;
the Data writing module 20 is configured to write the signal of the Data signal terminal Data and the threshold voltage of the driving transistor DT in the driving module 00 into the Gate of the driving transistor DT under the control of the signal of the first scan signal terminal Gate 1;
the light emission control module 10 is configured to drive the light emitting device L to emit light under the signal control of the light emission control signal terminal EM;
the black picture inserting module 40 is configured to control the driving transistor DT to be turned off to drive the light emitting device L not to emit light under the signal control of the second scan signal terminal Gate 2.
In the pixel circuit provided by the embodiment of the present invention, the black frame insertion module 40 is arranged, after a light emitting stage in a display frame time period, under the control of a signal at the second scan signal terminal Gate2, the driving transistor DT is controlled to be turned off to drive the light emitting device L to emit no light, so that a black frame is inserted in a display frame time period, and thus, the purpose of inserting a black frame is achieved under the condition of ensuring the charging time, the moving image response time of the display panel is further reduced, and the display effect is improved.
In specific implementation, in the embodiment of the present invention, as shown in fig. 1 to 4, the driving module 00 may include: a driving transistor DT and a storage capacitor Cst; wherein the content of the first and second substances,
a first end of the storage capacitor Cst is electrically connected with the first power signal terminal VDD, and a second end of the storage capacitor Cst is electrically connected with the gate electrode of the driving transistor DT; the storage capacitor Cst stores a signal of the gate electrode of the driving transistor DT, and maintains the signal of the gate electrode of the driving transistor DT in a floating state.
The grid electrode of the driving transistor DT is electrically connected with an initialization signal end Vinit through a Reset signal end Reset;
a first electrode of the driving transistor DT is electrically connected to a first power signal terminal VDD through the light emission control module 10, and is electrically connected to a Data signal terminal Data through the Data write module 20;
the second pole of the driving transistor DT is electrically connected to the first pole of the light emitting device L through the light emission control module 10, and the second pole of the light emitting device L is electrically connected to the second power signal terminal VSS.
In a specific implementation, in an embodiment of the present invention, the black picture inserting module 40 may include a first black picture transistor Mb1, a first terminal of the first black picture transistor Mb1 is electrically connected to the off signal terminal, a Gate of the first black picture transistor Mb1 is electrically connected to the second scan signal terminal Gate2, and a first pole of the first black picture transistor Mb1 is electrically connected to the Gate of the driving transistor DT.
Specifically, when the first black picture transistor Mb1 is turned on by the signal of the second scan signal terminal Gate2, the signal of the off signal terminal may be supplied to the Gate of the driving transistor DT to prevent the driving transistor DT from generating the driving current, thereby preventing the light emitting device L from emitting light.
In practical implementation, in the embodiment of the present invention, as shown in fig. 1, the off signal terminal may be the same signal terminal as the first power signal terminal VDD.
In a specific implementation, in an embodiment of the present invention, as shown in fig. 2, the black picture insertion module 40 may include a second black picture transistor Mb2, a second pole of the second black picture transistor Mb2 being electrically connected to the black picture signal terminal Vb, a Gate of the second black picture transistor Mb2 being electrically connected to the second scan signal terminal Gate2, and a first pole of the second black picture transistor Mb2 being electrically connected to the first pole of the driving transistor DT.
Specifically, when the second black picture transistor Mb2 is turned on by the signal of the second scan signal terminal Gate2, the signal of the black picture signal terminal Vb may be supplied to the first pole of the driving transistor DT so that the difference in voltage across the light emitting device L is smaller than the light emission-on voltage of the light emitting device L (when the difference in voltage across the light emitting device L is larger than the light emission-on voltage, the light emitting device L emits light) and is not enough to emit light.
In a specific implementation, in an embodiment of the present invention, as shown in fig. 3, the black picture insertion module 40 may include a third black picture transistor Mb3, a first pole of the third black picture transistor Mb3 being electrically connected to the Gate of the driving transistor DT, a Gate of the third black picture transistor Mb3 being electrically connected to the second scan signal terminal Gate2, and a second pole of the third black picture transistor Mb3 being electrically connected to the second pole of the driving transistor DT.
Specifically, when the third black picture transistor Mb3 is turned on by the signal of the second scan signal terminal Gate2, the Gate of the driving transistor DT may be electrically connected to the second diode of the driving transistor DT, and the driving transistor DT forms a diode structure such that the driving transistor DT does not generate a driving current, thereby not emitting light from the light emitting device L.
In particular implementation, in the embodiment of the present invention, as shown in fig. 1 to 3, the data writing module 20 may include a first data writing transistor Md1 and a second data writing transistor Md 2; wherein the content of the first and second substances,
a first pole of the first Data writing transistor Md1 is electrically connected to the Data signal terminal Data, a Gate of the first Data writing transistor Md1 is electrically connected to the first scan signal terminal Gate1, and a second pole of the first Data writing transistor Md1 is electrically connected to the first pole of the driving transistor DT;
a first pole of the second data writing transistor Md2 is electrically connected to the Gate of the driving transistor DT, a Gate of the second data writing transistor Md2 is electrically connected to the first scan signal terminal Gate1, and a second pole of the second data writing signal terminal is electrically connected to the second pole of the driving transistor DT.
Specifically, when the first Data writing transistor Md1 and the second Data writing transistor Md2 are in a turned-on state under the control of the signal of the first scan signal terminal Gate1, the first Data writing transistor Md1 may supply the signal of the Data signal terminal Data to the first pole of the driving transistor DT; the second Data writing transistor Md2 may turn on the gate electrode of the driving transistor DT with the second diode, form the driving transistor DT into a diode structure and discharge the driving transistor DT to the Data signal terminal Data, thereby writing the signal of the Data signal terminal Data and the threshold voltage of the driving transistor DT into the gate electrode of the driving transistor DT.
In particular, in order to reduce the number of transistors in the pixel circuit, the third black picture transistor Mb3 may be used in the pixel circuit shown in fig. 4 to multiplex the function of the second data writing transistor Md2, and the data writing module 20 may include the first data writing transistor Md1 and the third black picture transistor Mb3 as shown in fig. 4. By adjusting the signal of the second scan signal terminal Gate2, the third black transistor Mb3 is turned on even when the first Data writing transistor Md1 is in the on state, and the signal of the Data signal terminal Data and the threshold voltage of the driving transistor DT are written into the Gate of the driving transistor DT.
In specific implementation, in the embodiment of the present invention, as shown in fig. 1 to 4, the light emission control module 10 may include a first light emission control transistor Me1 and a second light emission control transistor Me 2; wherein the content of the first and second substances,
a first pole of the first emission control transistor Me1 is turned on with the first power signal terminal VDD, a gate of the first emission control transistor Me1 is electrically connected with the emission control signal terminal EM, and a second pole of the first emission control transistor Me1 is electrically connected with the first pole of the driving transistor DT;
a first pole of the second light emission control transistor Me2 is in conduction with a second pole of the driving transistor DT, a gate electrode of the second light emission control transistor Me2 is electrically connected with the light emission control signal terminal EM, and a second pole of the second light emission control transistor Me2 is electrically connected with the first pole of the light emitting device L.
Specifically, the first emission control transistor Me1 may supply the signal of the first power supply signal terminal VDD to the first pole of the driving transistor DT when it is in a conductive state under the signal control of the emission control signal terminal EM; the second emission control transistor Me2 may turn on the second electrode of the driving transistor DT and the first electrode of the light emitting device L when it is in a turn-on state under the signal control of the emission control signal terminal EM; when both the first and second light emission control transistors Me1 and Me2 are turned on, the driving current generated by the driving transistor DT may be supplied to the light emitting device L, so that the light emitting device L emits light.
In particular implementation, in the embodiment of the present invention, as shown in fig. 1 to 4, the reset module 30 may include a first reset transistor Mr1 and a second reset transistor Mr 2; wherein the content of the first and second substances,
a first pole of the first Reset transistor Mr1 is electrically connected to the initialization signal terminal Vinit, a gate of the first Reset transistor Mr1 is electrically connected to the Reset signal terminal Reset, and a second pole of the first Reset transistor Mr1 is electrically connected to the gate of the driving transistor DT;
a first pole of the second Reset transistor Mr2 is electrically connected to the initialization signal terminal Vinit, a gate of the second Reset transistor Mr2 is electrically connected to the Reset signal terminal Reset, and a second pole of the second Reset transistor Mr2 is electrically connected to the first pole of the light emitting device L.
Specifically, in the pixel circuit provided by the embodiment of the present invention, as shown in fig. 1 to 4, all the transistors may be P-type transistors. Of course, all the transistors may be N-type transistors, and are not limited herein.
Specifically, in the pixel circuit provided by the embodiment of the present invention, the P-type transistor is turned on by a low-level signal and turned off by a high-level signal; the N-type transistor is turned on under the action of a high-level signal and is turned off under the action of a low-level signal.
Specifically, in the pixel circuit provided in the embodiment of the present invention, each Transistor may be a Thin Film Transistor (TFT) or a Metal Oxide semiconductor field effect Transistor (MOS), which is not limited herein. Depending on the type of each transistor and the signal of the gate of each transistor, the first electrode of each transistor may be used as a source and the second electrode may be used as a drain, or the first electrode of each transistor may be used as a drain and the second electrode may be used as a source, which is not particularly limited herein.
In a specific implementation, in the pixel circuit provided in the embodiment of the invention, the first pole of the light emitting device L is electrically connected to the light emitting control module 10, and the second pole of the light emitting device L is electrically connected to the second power signal terminal VSS. Also, in particular implementation, the light emitting device L may be: at least one of Organic Light Emitting Diodes (OLED) and Quantum Dot Light Emitting Diodes (QLED). For example, when the light emitting device L is an OLED, the anode of the OLED is a first electrode of the light emitting device L, and the cathode is a second electrode of the light emitting device L.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel 100, including any one of the pixel circuits provided in the embodiment of the present invention, specifically, as shown in fig. 5, the pixel circuits are distributed in a plurality of sub-pixels P arranged in an array. The principle of the display panel to solve the problem is similar to the pixel circuit, so the implementation of the display panel can refer to the implementation of the pixel circuit, and the repeated parts are not described herein again. And other essential components of the display panel are all understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention.
In a specific implementation, the display panel provided in the embodiment of the present invention is an organic light emitting display panel. In actual production preparation, Layout (Layout) is generally performed on a substrate base plate to form the above-described display panel provided by the embodiment of the present invention, and the coupling capacitance in the pixel circuit can be set in the Layout in any manner as allowed by the Layout space.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the display panel provided by the embodiment of the invention. The display device may 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. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention. The implementation of the display device can refer to the above embodiments of the pixel circuit, and repeated descriptions are omitted.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method for any one of the pixel circuits provided by the embodiments of the present invention, as shown in fig. 6, including:
s601, in a resetting stage, resetting the driving module and the light-emitting device by the resetting module;
s602, in a data writing stage, a data writing module writes a signal of a data signal end and a threshold voltage of a driving transistor in a driving module into a grid electrode of the driving transistor;
s603, in a light-emitting stage, the light-emitting control module drives the light-emitting device to emit light;
s604, a black picture inserting stage, wherein the black picture inserting module controls the driving transistor to be cut off so as to drive the light-emitting device not to emit light;
the reset stage, the data writing stage, the light-emitting stage and the black picture inserting stage are sequentially and continuously formed into a display frame time period.
The driving method provided by the embodiment of the invention can insert the black picture in a display frame time period. Therefore, the purpose of inserting black pictures is achieved on the premise of ensuring the charging time, the moving image response time of the display panel is further reduced, and the display effect is improved. Specifically, in the black picture insertion stage, the second scan signal terminal Gate2 is applied with an on signal to turn on the first black picture transistor Mb1, the second black picture transistor Mb2, or the third black picture transistor Mb3, and the driving transistor DT is controlled to be turned off to drive the light emitting device not to emit light.
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. In the following description, 1 represents a high level, and 0 represents a low level. It should be noted that 1 and 0 are logic levels, which are only used to better explain the specific operation of the pixel circuit, not the specific voltage values.
The first embodiment,
The following describes the operation process of the display panel provided by the embodiment of the present invention with reference to the signal timing diagram shown in fig. 7, by taking the structure of the pixel circuit shown in fig. 1 of the display panel shown in fig. 5 as an example. In the figure, RE-n is the signal of the Reset signal terminal Reset of the sub-pixel of the nth row, Gate1-n is the signal of the first scanning signal terminal Gate1 of the sub-pixel of the nth row, Gate2-n is the signal of the second scanning signal terminal Gate2 of the sub-pixel of the nth row, and EM-n is the signal of the light-emitting control signal terminal EM of the sub-pixel of the nth row. The following description will take the working process of the first row of sub-pixels in the display panel as an example, and the working process of the sub-pixels in other rows in the display panel may be substantially the same as that of the first row of sub-pixels. Specifically, five stages, i.e., the reset stage t1, the data writing stage t2, the light emitting stage t3, the black frame insertion stage t4, and the black frame stage t5, are selected from the signal timing diagram shown in fig. 7. The voltage of the signal at the Data signal terminal Data is Vdata, the threshold voltage of the driving transistor DT is Vth, and the signal voltage at the first power terminal VDD is VDD.
In the reset phase t1, RE-1 is 0, Gate1-1 is 1, Gate2-1 is 1, and EM-1 is 1. Since RE-1 is equal to 0, the first reset transistor Mr1 is turned on, and a signal of the initialization signal terminal Vinit is supplied to the gate of the driving transistor DT to reset the gate of the driving transistor DT; the second reset transistor Mr2 is turned on to supply the signal of the initialization signal terminal Vinit to the first pole of the light emitting device L to clear the residual charge in the light emitting device L. When the Gate1-1 is equal to 1, the first data writing transistor Md1 and the second data writing transistor Md2 are turned off. When Gate2-1 is equal to 1, the first black picture transistor Mb1 is turned off. EM-1 is 1, the first and second emission control transistors Me1 and Me2 are turned off.
In the data writing phase t2, RE-1 is equal to 1, Gate1-1 is equal to 0, Gate2-1 is equal to 1, and EM-1 is equal to 1. Since the Gate1-1 is equal to 0, the first Data writing transistor Md1 and the second Data writing transistor Md2 are turned on, and the driving transistor DT forms a diode structure to discharge to the Data signal terminal Data until the voltage of the signal of the Gate of the driving transistor DT becomes Vdata + Vth to stop discharging, that is, the voltage of the signal of the Data signal terminal Data and the threshold voltage of the driving transistor DT are written to the Gate of the driving transistor DT. And RE-1 is 1, the first reset transistor Mr1 and the second reset transistor Mr2 are turned off. When Gate2-1 is equal to 1, the first black picture transistor Mb1 is turned off. EM-1 is 1, the first and second emission control transistors Me1 and Me2 are turned off.
In the light emitting phase t3, RE-1 is equal to 1, Gate1-1 is equal to 1, Gate2-1 is equal to 1, and EM-1 is equal to 0.
And RE-1 is 1, the first reset transistor Mr1 and the second reset transistor Mr2 are turned off. When the Gate1-1 is equal to 1, the first data writing transistor Md1 and the second data writing transistor Md2 are turned off. When Gate2-1 is equal to 1, the first black picture transistor Mb1 is turned off.
Since EM-1 is 0, the first and second emission control transistors Me1 and Me2 are turned on, and a signal of the first power source terminal VDD is supplied to the first electrode of the driving transistor DT, so that the driving transistor DT generates a driving current under the control of the signal of the gate thereof, and the light emitting device L is driven to emit light.
The driving current I satisfies the following formula:I＝K(Vgs-Vth)2＝K(Vdata+Vth-Vdd-Vth)2＝K(Vdata-Vdd)2wherein, in the step (A),
μnrepresenting the mobility of the drive transistor DT, CoxIs the capacitance of the gate oxide layer in unit area,
these values are relatively stable in the same structure for the aspect ratio of the driving transistor DT and can be calculated as constants.
In the black picture insertion stage t4, RE-1 is 1, Gate1-1 is 1, Gate2-1 is 0, and EM-1 is 0. And RE-1 is 1, the first reset transistor Mr1 and the second reset transistor Mr2 are turned off. When the Gate1-1 is equal to 1, the first data writing transistor Md1 and the second data writing transistor Md2 are turned off. The first and second emission control transistors Me1 and Me2 are turned on when EM-1 is 0. When the Gate2-1 is equal to 0, the first black picture transistor Mb1 is turned on, and the signal of the first power supply signal terminal VDD is supplied to the Gate of the driving transistor DT, Vgs becomes 0, and the driving transistor DT does not generate a driving current, and the light emitting device L does not emit light.
In the black picture stage t5, RE-1 is 1, Gate1-1 is 1, Gate2-1 is 1, and EM-1 is 0. In the pixel circuit, except that the first emission control transistor Me1 and the second emission control transistor Me2 are turned on, the other transistors are turned off, and the voltage of the signal of the gate of the driving transistor DT is maintained at Vdd, so that the driving transistor DT does not generate a driving current, and the light emitting device L does not emit light.
Example II,
The following describes the operation process of the display panel provided by the embodiment of the present invention with reference to the signal timing diagram shown in fig. 7, by taking the structure of the pixel circuit shown in fig. 2 of the display panel shown in fig. 5 as an example. The present embodiment is modified with respect to some embodiments in the first embodiment. Only the differences between the present embodiment and the first embodiment will be described below, and the descriptions of the same parts are omitted here.
In the reset phase t1, the data write phase t2, and the light emission phase t3, when Gate2-1 is equal to 1, the second black frame transistor Mb2 is turned off.
In the black picture insertion stage t4, RE-1 is 1, Gate1-1 is 1, Gate2-1 is 0, and EM-1 is 0. And RE-1 is 1, the first reset transistor Mr1 and the second reset transistor Mr2 are turned off. When the Gate1-1 is equal to 1, the first data writing transistor Md1 and the second data writing transistor Md2 are turned off. The first and second emission control transistors Me1 and Me2 are turned on when EM-1 is 0. Since the Gate2-1 is 0, the second black picture transistor Mb2 is turned on, and a signal of the black picture signal terminal is supplied to the first electrode of the driving transistor DT, so that the difference in voltage between both ends of the light emitting device L is smaller than the light emission turn-on voltage of the light emitting device L, and the light emitting device L does not emit light.
Example III,
The following describes the operation process of the display panel provided by the embodiment of the present invention with reference to the signal timing diagram shown in fig. 7, by taking the structure of the pixel circuit shown in fig. 3 of the display panel shown in fig. 5 as an example. The present embodiment is modified with respect to some embodiments in the first embodiment. Only the differences between the present embodiment and the first embodiment will be described below, and the descriptions of the same parts are omitted here.
In the reset phase t1, the data write phase t2, and the light emission phase t3, when Gate2-1 is equal to 1, the third black screen transistor Mb3 is turned off.
In the black picture insertion stage t4, RE-1 is 1, Gate1-1 is 1, Gate2-1 is 0, and EM-1 is 0. And RE-1 is 1, the first reset transistor Mr1 and the second reset transistor Mr2 are turned off. When the Gate1-1 is equal to 1, the first data writing transistor Md1 and the second data writing transistor Md2 are turned off. The first and second emission control transistors Me1 and Me2 are turned on when EM-1 is 0. When the Gate2-1 is equal to 0, the third black frame transistor Mb3 is turned on, the Gate of the driving transistor DT and the second pole of the driving transistor DT are turned on, and the voltage of the signal at the Gate of the driving transistor DT becomes Vdd + Vth, so that the driving transistor DT does not generate a driving current and the light emitting device L does not emit light.
Example four,
The following describes the operation process of the display panel provided by the embodiment of the present invention with reference to the signal timing diagram shown in fig. 8, by taking the structure of the pixel circuit shown in fig. 4 as an example of the display panel shown in fig. 5. This embodiment is modified with respect to some embodiments in the third embodiment. Only the differences between the present embodiment and the third embodiment will be described below, and the same parts will not be described herein.
In the data writing phase t2, RE-1 is equal to 1, Gate1-1 is equal to 0, Gate2-1 is equal to 0, and EM-1 is equal to 1. And RE-1 is 1, the first reset transistor Mr1 and the second reset transistor Mr2 are turned off. When Gate1-1 is equal to 1, the first Data writing transistor Md1 is turned on, and Gate2-1 is equal to 0, the third black picture transistor Mb3 is turned on, and the Gate of the driving transistor DT and the second pole of the driving transistor DT are turned on, so that the voltage of the signal at the Gate of the driving transistor DT becomes Vdata + Vth, that is, the voltage of the signal at the Data signal terminal Data and the threshold voltage of the driving transistor DT are written into the Gate of the driving transistor DT.
The pixel circuit, the driving method thereof, the display panel and the display device provided by the embodiment of the invention comprise a driving module, a light-emitting control module, a data writing module, a resetting module, a black picture inserting module and a light-emitting device; the reset module resets the driving module and the light-emitting device under the control of a signal of the reset signal end; the data writing module writes a signal of the data signal end and the threshold voltage of a driving transistor in the driving module into a grid electrode of the driving transistor under the control of a signal of the first scanning signal end; the light-emitting control module drives the light-emitting device to emit light under the signal control of the light-emitting control signal end; by arranging the black picture insertion module, after a light-emitting stage in a display frame time period, the driving transistor is controlled to be cut off under the control of a signal of the second scanning signal end so as to drive the light-emitting device not to emit light, and the black picture is inserted in the display frame time period, so that the purpose of inserting the black picture is realized under the condition of ensuring the charging time, the moving image response time of the display panel is further reduced, and the display effect is improved.
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 (13)
1. A pixel circuit, comprising: the device comprises a driving module, a light-emitting control module, a data writing module, a resetting module, a black picture inserting module and a light-emitting device; wherein the content of the first and second substances,
the reset module is configured to reset the driving module and the light emitting device under the signal control of a reset signal terminal;
the data writing module is configured to write a signal of a data signal end and a threshold voltage of a driving transistor in the driving module into a grid electrode of the driving transistor under the control of a signal of a first scanning signal end;
the light-emitting control module is configured to drive the light-emitting device to emit light under the signal control of a light-emitting control signal terminal;
the black picture insertion module is configured to control the driving transistor to be turned off under the signal control of the second scanning signal terminal to drive the light emitting device not to emit light.
2. The pixel circuit of claim 1, wherein the driving module comprises: a drive transistor and a storage capacitor; wherein the content of the first and second substances,
the first end of the storage capacitor is electrically connected with the first power signal end, and the second end of the storage capacitor is electrically connected with the grid electrode of the driving transistor;
the grid electrode of the driving transistor is electrically connected with the initialization signal end through the reset signal end;
the first electrode of the driving transistor is electrically connected with the first power signal end through the light-emitting control module and is electrically connected with the data signal end through the data writing module;
the second pole of the driving transistor is electrically connected with the first pole of the light-emitting device through the light-emitting control module, and the second pole of the light-emitting device is electrically connected with the second power signal end.
3. The pixel circuit of claim 2, wherein the black picture insertion module comprises: a first black picture transistor;
the gate of the first black picture transistor is electrically connected to the second scan signal terminal, the first electrode of the first black picture transistor is electrically connected to the gate of the driving transistor, and the second electrode of the first black picture transistor is electrically connected to the cut-off signal terminal.
4. The pixel circuit according to claim 3, wherein the off signal terminal and the first power supply signal terminal are the same signal terminal.
5. The pixel circuit of claim 2, wherein the black picture insertion module comprises: a second black picture transistor;
the gate of the second black picture transistor is electrically connected to the second scan signal terminal, the first electrode of the second black picture transistor is electrically connected to the first electrode of the driving transistor, and the second electrode of the second black picture transistor is electrically connected to the black picture signal terminal.
6. The pixel circuit of claim 2, wherein the black picture insertion module comprises: a third black picture transistor;
the gate of the third black picture transistor is electrically connected to the second scan signal terminal, the first electrode of the third black picture transistor is electrically connected to the gate of the driving transistor, and the second electrode of the third black picture transistor is electrically connected to the second electrode of the driving transistor.
7. The pixel circuit according to claim 6, wherein the data write module includes a first data write transistor and the third black picture transistor; wherein the content of the first and second substances,
a first electrode of the first data writing transistor is electrically connected to the data signal terminal, a gate of the first data writing transistor is electrically connected to the first scan signal terminal, and a second electrode of the first data writing transistor is electrically connected to the first electrode of the driving transistor.
8. The pixel circuit according to any of claims 2-6, wherein the data write module comprises a first data write transistor and a second data write transistor; wherein the content of the first and second substances,
a first electrode of the first data writing transistor is electrically connected to the data signal terminal, a gate electrode of the first data writing transistor is electrically connected to the first scan signal terminal, and a second electrode of the first data writing transistor is electrically connected to the first electrode of the driving transistor;
a first electrode of the second data writing transistor is electrically connected to the gate electrode of the driving transistor, a gate electrode of the second data writing transistor is electrically connected to the first scan signal terminal, and a second electrode of the second data writing signal terminal is electrically connected to the second electrode of the driving transistor.
9. The pixel circuit according to any one of claims 2 to 7, wherein the light emission control module includes a first light emission control transistor and a second light emission control transistor; wherein the content of the first and second substances,
a first electrode of the first light-emitting control transistor is conducted with the first power signal end, a gate electrode of the first light-emitting control transistor is electrically connected with the light-emitting control signal end, and a second electrode of the first light-emitting control transistor is electrically connected with the first electrode of the driving transistor;
a first electrode of the second light emission control transistor is electrically connected to a second electrode of the driving transistor, a gate of the second light emission control transistor is electrically connected to the light emission control signal terminal, and a second electrode of the second light emission control transistor is electrically connected to the first electrode of the light emitting device.
10. The pixel circuit according to any of claims 2-7, wherein the reset module comprises a first reset transistor and a second reset transistor; wherein the content of the first and second substances,
a first electrode of the first reset transistor is electrically connected with the initialization signal end, a grid electrode of the first reset transistor is electrically connected with the reset signal end, and a second electrode of the first reset transistor is electrically connected with a grid electrode of the driving transistor;
a first electrode of the second reset transistor is electrically connected to the initialization signal terminal, a gate electrode of the second reset transistor is electrically connected to the reset signal terminal, and a second electrode of the second reset transistor is electrically connected to the first electrode of the light emitting device.
11. A display panel comprising the pixel circuit according to any one of claims 1 to 10.
12. A display device characterized by comprising the display panel according to claim 11.
13. A driving method using the pixel circuit according to any one of claims 1 to 10, comprising:
a reset phase, wherein the reset module resets the driving module and the light-emitting device;
in the data writing stage, the data writing module writes a signal of a data signal end and the threshold voltage of a driving transistor in the driving module into the grid electrode of the driving transistor;
the light-emitting control module drives the light-emitting device to emit light;
a black picture inserting stage, wherein the black picture inserting module controls the driving transistor to be cut off so as to drive the light-emitting device not to emit light;
the reset stage, the data writing stage, the light-emitting stage and the black picture inserting stage are sequentially and continuously formed into a display frame time period.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022017044A1 (en) * | 2020-07-21 | 2022-01-27 | 京东方科技集团股份有限公司 | Display apparatus and driving method therefor |
| CN115223448A (en) * | 2022-07-25 | 2022-10-21 | 武汉天马微电子有限公司 | Display module assembly and display device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034532A (en) * | 2007-04-04 | 2007-09-12 | 友达光电股份有限公司 | Driving circuit, display device and method for adjusting the picture update rate |
| CN107481676A (en) * | 2017-09-30 | 2017-12-15 | 上海天马有机发光显示技术有限公司 | A kind of driving method of image element circuit, display panel and display device |
| CN108288456A (en) * | 2018-04-28 | 2018-07-17 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit and its driving method, display device |
| CN111243526A (en) * | 2020-01-19 | 2020-06-05 | 京东方科技集团股份有限公司 | Pixel circuit, display device and driving method |
| CN111276096A (en) * | 2020-03-26 | 2020-06-12 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN111445861A (en) * | 2020-05-06 | 2020-07-24 | 合肥京东方卓印科技有限公司 | Pixel driving circuit, driving method, shift register circuit and display device |
| US10739880B1 (en) * | 2011-09-28 | 2020-08-11 | Amazon Technologies, Inc. | Techniques for operating electronic paper displays |
-
2020
- 2020-09-14 CN CN202010959739.0A patent/CN112037714A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034532A (en) * | 2007-04-04 | 2007-09-12 | 友达光电股份有限公司 | Driving circuit, display device and method for adjusting the picture update rate |
| US10739880B1 (en) * | 2011-09-28 | 2020-08-11 | Amazon Technologies, Inc. | Techniques for operating electronic paper displays |
| CN107481676A (en) * | 2017-09-30 | 2017-12-15 | 上海天马有机发光显示技术有限公司 | A kind of driving method of image element circuit, display panel and display device |
| CN108288456A (en) * | 2018-04-28 | 2018-07-17 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit and its driving method, display device |
| CN111243526A (en) * | 2020-01-19 | 2020-06-05 | 京东方科技集团股份有限公司 | Pixel circuit, display device and driving method |
| CN111276096A (en) * | 2020-03-26 | 2020-06-12 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN111445861A (en) * | 2020-05-06 | 2020-07-24 | 合肥京东方卓印科技有限公司 | Pixel driving circuit, driving method, shift register circuit and display device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022017044A1 (en) * | 2020-07-21 | 2022-01-27 | 京东方科技集团股份有限公司 | Display apparatus and driving method therefor |
| US11908414B2 (en) | 2020-07-21 | 2024-02-20 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display apparatus with compensation and driving method therefor |
| CN115223448A (en) * | 2022-07-25 | 2022-10-21 | 武汉天马微电子有限公司 | Display module assembly and display device |
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