CN114495836B - Pixel circuit, driving method thereof, display panel and electronic equipment - Google Patents
Pixel circuit, driving method thereof, display panel and electronic equipment Download PDFInfo
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- CN114495836B CN114495836B CN202210166851.8A CN202210166851A CN114495836B CN 114495836 B CN114495836 B CN 114495836B CN 202210166851 A CN202210166851 A CN 202210166851A CN 114495836 B CN114495836 B CN 114495836B
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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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The invention provides a pixel circuit, a driving method thereof, a display panel and electronic equipment, wherein the pixel circuit is provided with a bias adjusting module for storing a data signal in a refreshing stage and applying a bias adjusting signal to a driving transistor in a maintaining stage so as to adjust the bias state of the driving transistor, so that the bias state of the driving transistor is ensured to be the same before the light emission in the refreshing stage and the maintaining stage, the problem of the difference of the light emission brightness between the refreshing stage and the first maintaining stage is solved, and the visual experience effect is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, a display panel, and an electronic device.
Background
Organic Light-Emitting diodes (OLEDs) have the advantages of low power consumption, low cost, self-luminescence, wide viewing angle, and fast response speed, and become one of the research hotspots in the display field at present.
The display panel can display in different application scenes by adopting different refresh rates, for example, a driving mode with a higher refresh rate is adopted to drive and display a dynamic picture (such as a sports event or a game scene) so as to ensure the fluency of the display picture; the slow-lens image or the static picture is driven and displayed by adopting a driving mode with a lower refresh rate so as to reduce the power consumption.
The display panel adopting the organic self-luminous technology has the problem that the brightness difference exists between the refreshing stage and the first maintaining stage when the refreshing rate is low, namely, the screen flicker phenomenon can occur, and the visual experience is influenced.
Disclosure of Invention
In view of the above, to solve the above problems, the present invention provides a pixel circuit, a driving method thereof, a display panel and an electronic device, and the technical solution is as follows:
a pixel circuit, the pixel circuit comprising:
a light emitting element for responding to a driving current to be in a light emitting state;
a driving transistor for supplying a driving current to the light emitting element;
the data writing module is electrically connected with the first end of the driving transistor and used for writing a data signal into the grid electrode of the driving transistor;
a bias adjustment module electrically connected to the first or second terminal of the driving transistor;
the pixel circuit comprises at least one refresh phase and at least one hold phase;
the bias adjusting module is used for storing the data signal in the refreshing stage and applying a bias adjusting signal to the driving transistor in the maintaining stage so as to adjust the bias state of the driving transistor.
A driving method of a pixel circuit for driving the pixel circuit, the driving method comprising:
in the refreshing stage, the data writing module writes a data signal into the grid electrode of the driving transistor and the bias adjusting module, and the bias adjusting module stores the data signal;
in the hold phase, the bias adjustment module applies a bias adjustment signal to the drive transistor to adjust a bias state of the drive transistor.
A display panel comprises the pixel circuit.
An electronic device comprises the display panel.
Compared with the prior art, the invention has the following beneficial effects:
according to the pixel circuit provided by the invention, the bias adjusting module is arranged for storing the data signal in the refreshing stage and applying the bias adjusting signal to the driving transistor in the maintaining stage so as to adjust the bias state of the driving transistor, so that the bias state of the driving transistor is ensured to be the same before the light emission in the refreshing stage and the maintaining stage, the problem of the difference of the light emitting brightness between the refreshing stage and the first maintaining stage is solved, and the visual experience effect is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a driving method of a pixel circuit according to an embodiment of the invention;
fig. 8 is a timing diagram illustrating a driving method according to an embodiment of the invention;
FIG. 9 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
FIG. 10 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
FIG. 11 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
FIG. 12 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
FIG. 13 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
FIG. 14 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
Based on the content recorded in the background art of the present application, in the inventive process of the present application, the inventor finds that, when the refresh rate of the display panel adopting the organic self-light emitting technology is low, there is a problem that the luminance difference exists between the refresh phase and the first hold phase, that is, a screen flicker phenomenon occurs, which affects the visual experience, specifically:
taking low frequency AOD (Always On Display) Display as an example for explanation, there is a data signal written into one electrode terminal of the driving transistor before the light emission in the refresh period, and there is a voltage signal written into the electrode terminal of the driving transistor in the light emission period in the refresh period; in the holding phase, since no data signal is written, the voltage signal is written into the electrode terminal of the transistor in both the light emitting phase and the light emitting phase, so that the bias states of the driving transistor are different before the light emitting in the refreshing phase and the holding phase, and further the problem that the difference of the light emitting brightness exists between the refreshing phase and the first holding phase is caused, namely, the screen flicker phenomenon occurs, and the visual experience is influenced.
In order to solve the technical problems in the prior art, a bias adjusting module is arranged in the application and used for storing a data signal in a refreshing stage, and a bias adjusting signal is applied to a driving transistor in a maintaining stage so as to adjust the bias state of the driving transistor, so that the bias state of the driving transistor is ensured to be the same before the light emission in the refreshing stage and the maintaining stage, the problem that the difference of the light emitting brightness exists between the refreshing stage and the first maintaining stage is solved, and the visual experience effect is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention.
The pixel circuit 10 includes:
and a light emitting element Q for responding to the driving current to be in a light emitting state.
And a driving transistor T0 for supplying a driving current to the light emitting element Q.
And the data writing module 11 is electrically connected with the first end of the driving transistor T0, and is used for writing a data signal Vdata into the gate of the driving transistor T0.
A bias adjustment module 12, wherein the bias adjustment module 12 is electrically connected to the first terminal or the second terminal of the driving transistor T0.
The pixel circuit 10 comprises at least one refresh phase and at least one hold phase.
The bias adjusting module 12 is configured to store the data signal Vdata in the refresh phase, and apply a bias adjusting signal to the driving transistor T0 in the hold phase to adjust the bias state of the driving transistor T0.
In this embodiment, in the design process of the pixel circuit, the parasitic capacitance of the first end and/or the second end node of the driving transistor T0 is/are reasonably adjusted, and in combination with the data signal Vdata stored by the bias adjusting module 12 in the refresh stage, the bias adjusting signal is applied to the driving transistor T0 in the hold stage to adjust the bias state of the driving transistor T0, so that the bias states of the driving transistor T0 before the light emission in the refresh stage and the hold stage are the same, the problem that the difference of the light emission brightness exists between the refresh stage and the first hold stage is solved, and the visual experience effect is improved.
It should be noted that, referring to fig. 2, fig. 2 is a schematic circuit structure diagram of another pixel circuit provided in the embodiment of the present invention, where the bias adjusting module 12 is connected to the first end of the driving transistor T0, and a voltage value of the bias adjusting signal is at least the same as a voltage value of the data signal Vdata, and in combination with the setting of the parasitic capacitance of the first end and/or the second end node of the driving transistor T0, the bias state of the driving transistor T0 is guaranteed to be the same before the light emission in the refresh phase and the hold phase, so that the problem of the difference between the light emission brightness in the refresh phase and the first hold phase is solved, and the visual experience effect is improved.
Optionally, the bias adjusting module 12 may be further connected to the second end of the driving transistor T0, and at this time, the voltage value of the bias adjusting signal is equal to the sum of the voltage value of the data signal Vdata and the threshold voltage of the driving transistor T0, and in combination with the setting of the parasitic capacitance of the first end and/or the second end node of the driving transistor T0, the bias states of the driving transistor before the light emission in the refresh phase and the hold phase are ensured to be the same, so that the problem of the difference between the light emission luminance in the refresh phase and the first hold phase is solved, and the visual experience effect is improved.
Further, in the course of the invention and creation of the present application, the applicant found that in the current prior art scheme of performing bias processing on the driving transistor, in order to reduce power consumption and simplify wiring, there are mainly two bias modes for the driving transistor:
one is as follows: under the condition that the 7T1C pixel circuit is not changed, a bias voltage is transmitted through the data wiring to bias the driving transistor under the condition that a data signal is not written in the holding stage, the bias voltage is a constant voltage, and the bias voltage of the pixel circuit corresponding to each sub-pixel in the display panel is the same.
And the second step is as follows: a bias transistor is additionally arranged on the basis of a 7TIC pixel circuit to form an 8T1C pixel circuit, a bias signal is transmitted by the bias transistor in the bias stage in the data writing stage and the holding stage, the bias processing of the driving transistor is realized, wherein the bias signal is also a fixed signal, and the bias signals of the pixel circuits corresponding to each sub-pixel in the display panel are also the same.
However, when the display panel displays a picture at a low refresh rate, the gray scales of each sub-pixel are not completely the same, that is, the data voltages written by the driving transistors of the pixel circuits corresponding to each sub-pixel in the refresh period are different, and obviously, the bias states of the driving transistors are also different due to the difference of the data voltages.
In the present application, the bias adjusting module 12 stores the data signal Vdata in the refresh phase, and applies a bias adjusting signal to the driving transistor T0 in the hold phase, where the bias adjusting signal is related to the data signal, that is, the bias adjusting signal of the driving transistor corresponding to each sub-pixel is related to the data signal written in the sub-pixel, so as to implement differential bias and ensure that the bias effect of each driving transistor is close to the optimal state.
As shown in fig. 1, the second terminal of the driving transistor T0 is coupled to the light emitting device Q, and provides a driving current for the light emitting device Q after the driving transistor T0 is turned on.
Optionally, as shown in fig. 1, a control end of the data writing module 11 is electrically connected to the first scan signal end, a first end of the data writing module is electrically connected to the data signal end, and a second end of the data writing module is electrically connected to the first end of the driving transistor T0.
The first scan signal terminal is configured to output a first scan signal S1, and the data signal terminal is configured to output a data signal Vdata.
Optionally, the data writing module 11 includes a data writing transistor T1, the data writing transistor T1 is connected to the first end of the driving transistor T0, the first end of the data writing transistor T1 is configured to receive a data signal Vdata, the second end of the data writing transistor T1 is connected to the first end of the driving transistor T0, and the gate of the data writing transistor T1 is configured to receive the first scanning signal S1.
The first scanning signal S1 received by the data writing transistor T1 is a pulse signal, and an effective pulse of the first scanning signal S1 controls the data writing transistor T1 to be in a conducting state, so as to provide the data signal Vdata to the driving transistor T0; the ineffective pulse of the first scan signal S1 controls the data writing transistor T1 to be in an off state.
The pixel circuit 10 at least includes a data writing stage, in which the data writing transistor T1 is in a conducting state under the control of the first scan signal S1 to provide the data signal Vdata to the driving transistor T0.
Optionally, in another embodiment of the present invention, referring to fig. 3, fig. 3 is a schematic circuit structure diagram of another pixel circuit provided in an embodiment of the present invention.
The bias adjustment module 12 includes: a first transistor T2 and a first capacitor C1.
The gate of the first transistor T2 is electrically connected to a bias control signal terminal, the first terminal is connected to the first terminal or the second terminal of the driving transistor T0, and the second terminal is electrically connected to the first plate of the first capacitor C1.
And the second polar plate of the first capacitor C1 is electrically connected with a fixed potential end V1.
In this embodiment, the bias control signal terminal is configured to output a bias control signal S2, the bias control signal S2 received by the first transistor T2 is a pulse signal, and an active pulse of the bias control signal S2 controls the first transistor T2 to be in a conducting state; the inactive pulse of the bias control signal S2 controls the first transistor T2 to be in an off state.
As shown in fig. 3, taking the example that the first terminal of the first transistor T2 is connected to the first terminal of the driving transistor T0, the active pulse of the first scan signal S1 controls the data writing transistor T1 to be in a conducting state during the data writing process in the refresh period, so as to provide the data signal Vdata to the driving transistor T0; and the effective pulse of the bias control signal S2 controls the first transistor T2 to be in a conducting state, so that the first capacitor C1 thereof stores the data signal Vdata; the invalid pulse of the first scanning signal S1 controls the data writing transistor T1 to be in an off state in a light emitting stage of the refresh stage; and the inactive pulse of the bias control signal S2 controls the first transistor T2 to be in an off state.
Further, the first transistor T2 is controlled to be in a conducting state by an effective pulse of the bias control signal S2 before the light emission in the holding stage, and a bias adjustment signal is applied to the first end of the driving transistor T0 based on the data signal Vdata stored in the first capacitor C1 to adjust the bias state of the driving transistor T0, so that the bias states of the driving transistor T0 before the light emission in the refreshing stage and the holding stage are ensured to be the same, and thus the problem that the light emission brightness difference exists between the refreshing stage and the first holding stage is solved, and the visual experience effect is improved.
Optionally, in another embodiment of the present invention, referring to fig. 4, fig. 4 is a schematic circuit structure diagram of another pixel circuit provided in the embodiment of the present invention.
The pixel circuit further includes:
and a threshold compensation module 13, configured to compensate for a threshold voltage of the driving transistor T0.
The control end of the threshold compensation module 13 is electrically connected to the second scan signal end, the first end is electrically connected to the gate of the driving transistor T0, and the second end is electrically connected to the second end of the driving transistor T0.
The second scan signal terminal is used for outputting a second scan signal S3.
In this embodiment, as shown in fig. 4, the threshold compensation module 13 includes a compensation transistor T3 for compensating the threshold voltage of the driving transistor T0, a first terminal of the compensation transistor T3 is connected to the gate of the driving transistor T0 to form a first node N1, a second terminal of the compensation transistor T3 is connected to the second terminal of the driving transistor T0, and a gate of the compensation transistor T3 is used for receiving the second scan signal S3. The second scan signal S3 received by the compensation transistor T3 is a pulse signal, an active pulse of the second scan signal S3 controls the compensation transistor T3 to be in an on state, and an inactive pulse of the second scan signal S3 controls the compensation transistor T3 to be in an off state.
The pixel circuit 10 further comprises at least a threshold compensation phase, in which the data writing transistor T1 is in a conducting state under the control of the first scan signal S1 to provide the data signal Vdata to the driving transistor T0, and the compensation transistor T3 is in a conducting state under the control of the second scan signal S3 to compensate the threshold voltage Vth of the driving transistor M0.
Optionally, in another embodiment of the present invention, referring to fig. 5, fig. 5 is a schematic circuit structure diagram of another pixel circuit provided in the embodiment of the present invention.
The pixel circuit further includes:
and a first reset module 14 electrically connected to the gate of the driving transistor T0, for providing an initialization voltage signal Vref to the gate of the driving transistor T0 in an initialization phase.
The control end of the first reset module 14 is electrically connected to the third scan signal end, the first end is electrically connected to the initialization voltage signal end, and the second end is electrically connected to the gate of the driving transistor T0.
And a second reset module 15, electrically connected to the current input terminal of the light emitting element Q, for providing an initialization voltage signal Vref to the current input terminal of the light emitting element Q in the initialization phase.
The control end of the second reset module 15 is electrically connected to the fourth scan signal end, the first end is electrically connected to the initialization voltage signal end, and the second end is electrically connected to the current input end of the light emitting element Q.
The third scan signal terminal is configured to output a third scan signal S4, the initialization voltage signal terminal is configured to output an initialization voltage signal Vref, and the fourth scan signal terminal is configured to output a fourth scan signal S5.
In this embodiment, as shown in fig. 5, the first reset module 14 includes a second transistor T4; a first terminal of the second transistor T4 receives the initialization voltage signal Vref, a second terminal of the second transistor T4 is connected to the gate of the driving transistor T0, and the gate of the second transistor T4 is configured to receive the third scan signal S4. The third scan signal S4 received by the second transistor T4 is a pulse signal, an active pulse of the third scan signal S4 controls the second transistor T4 to be in an on state, and an inactive pulse of the third scan signal S4 controls the second transistor T4 to be in an off state.
As shown in fig. 5, the second reset module 15 includes a third transistor T5; a first terminal of the third transistor T5 is for receiving the initialization voltage signal Vref, a second terminal of the third transistor T5 is connected to the anode of the light emitting element Q, and a gate of the third transistor T5 is for receiving the fourth scan signal S5. The fourth scanning signal S5 received by the third transistor T5 is a pulse signal, an active pulse of the fourth scanning signal S5 controls the third transistor T5 to be in an on state, and an inactive pulse of the fourth scanning signal S5 controls the third transistor T5 to be in an off state.
The pixel circuit 10 at least further includes a reset phase, in which the second transistor T4 is in a conducting state under the control of the third scan signal S4, and the initialization voltage signal Vref is written into the gate of the driving transistor T0 through the second transistor T4 to reset the gate of the driving transistor T0; the third transistor T5 is in an on state under the control of the fourth scan signal S5, and the initialization voltage signal Vref is written to the anode of the light emitting element Q through the third transistor T5 to initialize the light emitting element Q.
Optionally, in another embodiment of the present invention, referring to fig. 6, fig. 6 is a schematic circuit structure diagram of another pixel circuit provided in the embodiment of the present invention.
The pixel circuit further includes: a first lighting control module 16 and a second lighting control module 17.
The control terminal of the first light-emitting control module 16 is electrically connected to the fifth scan signal terminal, the first terminal thereof is electrically connected to the first voltage terminal PVDD, and the second terminal thereof is electrically connected to the first terminal of the driving transistor T0.
The control end of the second light-emitting control module 17 is electrically connected to the fifth scan signal end, the first end of the second light-emitting control module is electrically connected to the current input end of the light-emitting element Q, and the second end of the second light-emitting control module is electrically connected to the second end of the driving transistor T0.
Wherein, the fifth scanning signal terminal is used for outputting a fifth scanning signal Emit, and the current input terminal of the light emitting element Q is the anode of the light emitting unit Q.
Optionally, as shown in fig. 6, the pixel circuit further includes:
and a storage capacitor C2, a first plate of the storage capacitor C2 being electrically connected to the first voltage terminal PVDD, and a second plate being electrically connected to the gate of the driving transistor T0.
Wherein the second plate is connected to the first node N1.
In this embodiment, as shown in fig. 6, the first light emitting control module 16 includes a fourth transistor T6, the second light emitting control module 17 includes a fifth transistor T7, the fourth transistor T6 is connected between the first voltage terminal PVDD and the first terminal of the driving transistor T0, and the fifth transistor T7 is connected between the second terminal of the driving transistor T0 and the light emitting element Q, for controlling whether the pixel circuit 10 is in the light emitting phase or the non-light emitting phase.
The cathode of the light emitting element Q serves as the second voltage terminal PVEE.
The gates of the fourth transistor T6 and the fifth transistor T7 receive the fifth scanning signal Emit at the same time, and the fifth transistor T7 is in a conducting state or a turn-off state under the control of the fifth scanning signal Emit; the fifth scanning signal Emit received by the gate of the fifth transistor T7 is a pulse signal, and in the light emitting stage, the fifth scanning signal Emit outputs an effective pulse to control the fifth transistor T7 to be in a conducting state, so that the driving current provided by the driving transistor T0 flows into the light emitting element Q to cause it to Emit light; in the non-light emitting stage, the control signal Emit outputs an invalid pulse to control the fifth transistor T7 to be in an off state, and the light emitting element Q does not Emit light.
Optionally, in another embodiment of the present invention, a driving method of a pixel circuit is further provided, for driving the pixel circuit provided in the foregoing embodiment, with reference to fig. 7, fig. 7 is a schematic flow chart of the driving method of the pixel circuit provided in the embodiment of the present invention.
The driving method includes:
s101: in the refresh phase, the data writing module writes a data signal into the gate of the driving transistor and the bias adjustment module, and the bias adjustment module stores the data signal.
S102: in the hold phase, the bias adjustment module applies a bias adjustment signal to the drive transistor to adjust a bias state of the drive transistor.
In this embodiment, referring to fig. 8, fig. 8 is a timing diagram of a driving method according to an embodiment of the present invention, which is described by taking an example that a first terminal of a first transistor T2 is connected to a first terminal of a driving transistor T0, and an active pulse of a first scan signal S1 controls a data writing transistor T1 to be in a conducting state during a data writing process in a non-light emitting stage of a refresh stage, so as to provide a data signal Vdata to the driving transistor T0; and the effective pulse of the bias control signal S2 controls the first transistor T2 to be in a conducting state, so that the first capacitor C1 stores the data signal Vdata; an invalid pulse of the first scan signal S1 controls the data writing transistor T1 to be in an off state in a light-emitting stage of the refresh stage; and the inactive pulse of the bias control signal S2 controls the first transistor T2 to be in an off state.
Further, the effective pulse of the bias control signal S2 controls the first transistor T2 to be in a conducting state in the non-light-emitting stage of the holding stage, and a bias adjustment signal is applied to the first end of the driving transistor T0 based on the data signal Vdata stored in the first capacitor C1 to adjust the bias state of the driving transistor T0, so that the bias state of the driving transistor T0 is ensured to be the same before the light emission in the refresh stage and the holding stage, and further, the problem that the difference between the light emission brightness in the refresh stage and the first holding stage exists is solved, and the visual experience effect is improved.
Specifically, the bias adjusting module 12 stores the data signal Vdata in the refresh stage and applies a bias adjusting signal to the driving transistor T0 in the hold stage, where the bias adjusting signal is related to the data signal, that is, the bias adjusting signal of the driving transistor corresponding to each sub-pixel is related to the data signal written in the sub-pixel, so as to implement differential bias and ensure that the bias effect of each driving transistor is optimal.
As shown in fig. 6, the pixel circuit further includes: the device comprises a first light emitting control module and a second light emitting control module.
The first light-emitting control module and the second light-emitting control module are controlled by a light-emitting control signal, namely a fifth scanning signal Emit; each cycle of the light emission control signal includes an active phase in which the light emitting element Q is controlled to be in a light emission phase and an off phase; and controlling the light-emitting element Q to be in a non-light-emitting stage in the cut-off stage.
As shown in fig. 8, the holding phase includes a light-emitting phase and a non-light-emitting phase.
In a non-emitting phase of the holding phase, the bias adjusting module 12 applies the bias adjusting signal to the driving transistor T0 in response to a bias control signal S2.
That is to say, the effective pulse of the bias control signal S2 controls the first transistor T2 to be in a conducting state in the non-light-emitting stage of the holding stage, and the bias adjustment signal is applied to the first end of the driving transistor T0 based on the data signal Vdata stored in the first capacitor C1 to adjust the bias state of the driving transistor T0, so as to ensure that the bias states of the driving transistor T0 before the light emission in the refresh stage and the holding stage are the same, thereby solving the problem that the difference between the light emission brightness in the refresh stage and the first holding stage exists, and improving the visual experience effect.
It should be noted that, in fig. 8, one refresh phase and three hold phases are taken as an example for description, and the number of refresh phases and the number of hold phases are not limited in the embodiment of the present invention.
Optionally, in another embodiment of the present invention, referring to fig. 9, fig. 9 is a timing diagram of another driving method provided in the embodiment of the present invention.
The method includes providing a plurality of Emit pulses in a refresh stage, that is, a plurality of emission stages and a non-emission stage, and providing a plurality of Emit pulses in a sustain stage, that is, a plurality of emission stages and a non-emission stage, where the number of Emit pulses in the sustain stage is an integral multiple of one Emit pulse in the refresh stage, for example, the number of Emit pulses in the sustain stage is an even multiple of one Emit pulse in the refresh stage, and the case where the number of Emit pulses in the sustain stage is twice of one Emit pulse in the refresh stage is illustrated in fig. 9.
As shown in fig. 9, in the non-emission period of an Emit pulse in the refresh period, the data writing transistor T1 is turned on under the control of the first scan signal S1 to supply the data signal Vdata to the driving transistor T0, and the first transistor T2 is turned on under the control of the bias control signal S2 to store the data signal Vdata in the first capacitor C1; the first transistor T2 may then be brought to a conducting state under control of the bias control signal S2 in a non-emitting phase of the other Emit pulses of the refresh phase, while a bias adjustment signal is applied to the first terminal of the driving transistor T0 based on the data signal Vdata stored by the first capacitor C1 to adjust the bias state of said driving transistor T0.
That is to say, in the embodiment of the present application, not only the bias processing of the driving transistor T0 may be implemented in the holding stage, but also the bias processing of the driving transistor T0 may be implemented in the refreshing stage in order to make the interval of the bias processing of the driving transistor T0 more uniform, so as to further improve the bias effect of the driving transistor T0.
It should be noted that, in the refresh phase, except the Emit pulse for data writing, the non-emission phase of other Emit pulses can implement bias processing on the driving transistor T0.
Optionally, in another embodiment of the present invention, referring to fig. 10, fig. 10 is a timing diagram of another driving method provided in the embodiment of the present invention.
In the refresh phase, the effective duration of the bias control signal S2 is T1.
In a first one of the non-emitting periods of the holding period, the active duration of the bias control signal S2 is N1.
Wherein N1 is more than or equal to T1.
In this embodiment, the effective duration of the bias control signal S2 in the first non-emission phase of the holding phase is greater than or equal to the effective duration of the bias control signal S2 in the refresh phase, so that the bias degree of the driving transistor T0 in the first non-emission phase of the holding phase is ensured to be the same as the bias degree of the driving transistor in the non-emission phase of the refresh phase to the greatest extent, thereby solving the problem of the difference between the emission brightness in the refresh phase and the first holding phase and improving the visual experience effect.
Optionally, in another embodiment of the present invention, each active phase of the bias control signal S2 is set corresponding to N periods of the light emitting control signal; n is more than or equal to 1 and less than or equal to 32, and N is an integer.
That is to say, a bias adjusting signal is applied to the driving transistor T0 in the non-light-emitting stage of each holding stage to adjust the bias state of the driving transistor T0, so that the bias state of the driving transistor T0 is ensured to be the same before the light emission of the refreshing stage and each holding stage, and thus the problem that the difference of the light-emitting brightness exists between the refreshing stage and the holding stage is solved, and the visual experience effect is improved.
It should be noted that fig. 10 illustrates one refresh phase and one hold phase as an example, and the number of refresh phases and the number of hold phases are not limited in the embodiment of the present invention.
Optionally, in another embodiment of the present invention, referring to fig. 11, fig. 11 is a timing diagram of another driving method provided in the embodiment of the present invention.
The effective duration of the bias control signal is gradually increased for all the holding phases, namely N1 < N2 < N3 \8230andNn, wherein N is the number of holding phases.
It should be noted that the effective duration of the bias control signal in the hold phase may be that a bias adjusting phase is included in the hold phase, and the effective duration of the bias adjusting phase is the effective duration of the bias control signal in the hold phase.
Or, referring to fig. 12, fig. 12 is a timing diagram of another driving method according to an embodiment of the present invention, wherein the non-light-emitting period of the holding period includes a plurality of bias adjusting periods for performing a bias process on the driving transistor T0, that is, the time for biasing the driving transistor T0 is increased by increasing the number of pulses for biasing the driving transistor T0.
In this embodiment, since the bias adjusting module 12 applies the bias adjusting signal to the driving transistor T0 in multiple holding stages, the voltage stored by the first capacitor C1 inevitably weakens in the process, and the bias degree to the driving transistor T0 is further affected, so that in the embodiment of the present invention, by reasonably adjusting the effective duration time of the bias control signal S2 in each holding stage, it is ensured that the bias degree to the driving transistor T0 in each holding stage is the same as the bias state to the driving transistor T0 in the refresh stage, and thus the problem of the difference of the light emitting brightness between the refresh stage and the holding stage is solved, and the visual experience effect is improved.
It should be noted that, by adjusting the parasitic capacitance of the first end and/or the second end of the driving transistor based on the first capacitor C1, the voltage loss of the first capacitor C1 can be reduced in the process of biasing the driving transistor; theoretically, the smaller the parasitic capacitance of the first terminal and/or the second terminal of the driving transistor, the voltage loss of the first capacitor C1 is minimized during the process of biasing the driving transistor.
Optionally, in another embodiment of the present invention, referring to fig. 13, fig. 13 is a timing diagram of another driving method provided in the embodiment of the present invention.
Starting from the second hold phase, the bias adjustment module 12 does not apply a bias adjustment signal to the drive transistor T0 in at least one of the hold phases.
In this embodiment, since there is a significant difference in luminance display between the first holding phase and the refreshing phase, the bias control signal S2 must be controlled to be in an active pulse state to control the first transistor T2 to be in a conducting state in the non-emission phase of the first holding phase, and the bias adjustment signal is applied to the first terminal of the driving transistor T0 based on the data signal Vdata stored in the first capacitor C1 to adjust the bias state of the driving transistor T0, so as to ensure that the bias states of the driving transistor T0 before the emission of the refreshing phase and the holding phase are the same, thereby solving the problem of the difference in luminance between the refreshing phase and the first holding phase and improving the visual experience effect.
Since the control logic of the second holding phase is the same, the brightness display difference between two adjacent holding phases will gradually disappear, and therefore, in an embodiment of the present invention, the second holding phase may be started, and the bias adjusting module 12 does not apply the bias adjusting signal to the driving transistor T0 in at least one of the holding phases, so that the control logic of the pixel circuit can be simplified while ensuring that the display difference does not occur in the device.
As shown in fig. 13, in the third holding phase, the bias adjustment module 12 does not apply a bias adjustment signal to the driving transistor T0.
Optionally, in another embodiment of the present invention, referring to fig. 14, fig. 14 is a timing diagram of another driving method provided in the embodiment of the present invention.
As shown in fig. 6, the pixel circuit further includes: a threshold compensation module 13 and a first reset module 14.
As shown in fig. 14, the refresh phase includes: initialization phase and data writing phase.
In the data writing phase, the data writing module 11 writes the data signal Vdata into the gate of the driving transistor T0 in response to a first scan signal S1, and the bias adjusting module 12 stores the data signal Vdata in response to a bias control signal S2; and the threshold compensation module 13 compensates the threshold voltage of the driving transistor T0 in response to the second scan signal S3 being in the active state.
In the initialization phase, the first reset module 14 writes an initialization voltage signal Vref into the gate of the driving transistor T0 in response to the third scan signal S4 being in an active state.
Optionally, based on all the above embodiments of the present invention, in another embodiment of the present invention, a display panel is further provided, referring to fig. 15, and fig. 15 is a schematic structural diagram of a display panel provided in an embodiment of the present invention.
The display panel 100 includes a plurality of pixel units 101, each of the pixel units 101 includes a plurality of sub-pixels, and at least one of the sub-pixels corresponds to one of the pixel circuits 10 according to the above embodiments of the present invention.
The display panel 100 has the same characteristics as the pixel circuit 10, and the display effect of the display panel 100 can be greatly improved when the pixel circuit 10 drives the display.
Optionally, based on all the above embodiments of the present invention, in another embodiment of the present invention, an electronic device is further provided, referring to fig. 16, and fig. 16 is a schematic structural diagram of an electronic device provided in an embodiment of the present invention.
The electronic device 200 includes the display panel 100 provided in the above embodiment.
Specifically, the electronic device 200 includes, but is not limited to, electronic devices such as a tablet and a mobile phone, and the electronic device 200 has the same features as the display panel 100 provided in the above embodiment of the present invention.
The pixel circuit, the driving method thereof, the display panel, and the electronic device provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples herein, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. A pixel circuit, comprising:
a light emitting element for responding to a driving current to be in a light emitting state;
a driving transistor for supplying a driving current to the light emitting element;
the data writing module is electrically connected with the first end of the driving transistor and used for writing a data signal into the grid electrode of the driving transistor;
a bias adjustment module electrically connected to the first or second terminal of the driving transistor;
the pixel circuit comprises at least one refresh phase and at least one hold phase;
the bias adjusting module is used for storing the data signal in the refreshing stage and applying a bias adjusting signal to the driving transistor in the maintaining stage so as to adjust the bias state of the driving transistor;
wherein the bias adjustment module comprises: a first transistor and a first capacitor;
the grid electrode of the first transistor is electrically connected with a bias control signal end, the first end of the first transistor is connected with the first end or the second end of the driving transistor, and the second end of the first transistor is electrically connected with the first polar plate of the first capacitor;
and the second polar plate of the first capacitor is electrically connected with a fixed potential end.
2. The pixel circuit according to claim 1, wherein a control terminal of the data writing module is electrically connected to the first scan signal terminal, a first terminal is electrically connected to the data signal terminal, and a second terminal is electrically connected to the first terminal of the driving transistor.
3. The pixel circuit according to claim 1, further comprising:
the threshold compensation module is used for compensating the threshold voltage of the driving transistor;
the control end of the threshold compensation module is electrically connected with the second scanning signal end, the first end of the threshold compensation module is electrically connected with the grid electrode of the driving transistor, and the second end of the threshold compensation module is electrically connected with the second end of the driving transistor.
4. The pixel circuit of claim 1, further comprising:
the first reset module is electrically connected with the grid electrode of the driving transistor and used for providing an initialization voltage signal for the grid electrode of the driving transistor in an initialization stage;
the control end of the first reset module is electrically connected with the third scanning signal end, the first end of the first reset module is electrically connected with the initialization voltage signal end, and the second end of the first reset module is electrically connected with the grid electrode of the driving transistor;
the second reset module is electrically connected with the current input end of the light-emitting element and used for providing an initialization voltage signal for the current input end of the light-emitting element in the initialization stage;
the control end of the second reset module is electrically connected with the fourth scanning signal end, the first end of the second reset module is electrically connected with the initialization voltage signal end, and the second end of the second reset module is electrically connected with the current input end of the light-emitting element.
5. The pixel circuit according to claim 1, further comprising: the device comprises a first light emitting control module and a second light emitting control module;
the control end of the first light-emitting control module is electrically connected with the fifth scanning signal end, the first end of the first light-emitting control module is electrically connected with the first voltage end, and the second end of the first light-emitting control module is electrically connected with the first end of the driving transistor;
the control end of the second light-emitting control module is electrically connected with the fifth scanning signal end, the first end of the second light-emitting control module is electrically connected with the current input end of the light-emitting element, and the second end of the second light-emitting control module is electrically connected with the second end of the driving transistor.
6. The pixel circuit of claim 5, further comprising:
and a first electrode plate of the storage capacitor is electrically connected with the first voltage end, and a second electrode plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor.
7. A driving method of a pixel circuit for driving the pixel circuit according to any one of claims 1 to 6, the driving method comprising:
in the refreshing stage, the data writing module writes a data signal into the grid electrode of the driving transistor and the bias adjusting module, and the bias adjusting module stores the data signal;
in the hold phase, the bias adjustment module applies a bias adjustment signal to the drive transistor to adjust a bias state of the drive transistor.
8. The driving method according to claim 7, wherein the pixel circuit further comprises: the lighting control device comprises a first lighting control module and a second lighting control module;
the first light-emitting control module and the second light-emitting control module are controlled by light-emitting control signals; each cycle of the light emission control signal includes an active phase in which the light emitting element is controlled to be in a light emission phase and an off phase; controlling the light-emitting element to be in a non-light-emitting stage in the cut-off stage;
the holding phase comprises a light-emitting phase and a non-light-emitting phase;
the bias adjustment module applies the bias adjustment signal to the driving transistor in response to a bias control signal during a non-emission phase of the hold phase.
9. The driving method according to claim 8, wherein in the refresh phase, an active duration of the bias control signal is T1;
in a first one of the non-emitting periods of the holding period, an effective duration of the bias control signal is N1;
wherein N1 is more than or equal to T1.
10. The driving method according to claim 8, wherein each of the bias control signal active periods is set corresponding to N periods of the light emission control signal; n is not less than 1 and not more than 32, and N is an integer.
11. The driving method according to claim 10, wherein the effective duration of the bias control signal is gradually increased for all the holding periods.
12. The driving method of claim 9, wherein the bias adjustment module does not apply a bias adjustment signal to the driving transistor in at least one of the holding phases starting from a second holding phase.
13. The driving method according to claim 8, wherein the pixel circuit further comprises: the device comprises a threshold compensation module and a first reset module;
the refresh phase includes: an initialization stage and a data writing stage;
in the data writing phase, the data writing module writes the data signal into the grid electrode of the driving transistor in response to a first scanning signal, and the bias adjusting module stores the data signal in response to a bias control signal; the threshold compensation module responds to a second scanning signal and is in a working state to compensate the threshold voltage of the driving transistor;
in an initialization stage, the first reset module responds to a third scanning signal in a working state and writes an initialization voltage signal into the grid electrode of the driving transistor.
14. A display panel characterized in that the display panel comprises a pixel circuit according to any one of claims 1 to 6.
15. An electronic device characterized in that the electronic device comprises the display panel according to claim 14.
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| KR20210077087A (en) * | 2019-12-16 | 2021-06-25 | 삼성디스플레이 주식회사 | Light emission driver and display device including the same |
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